JP7183966B2 - Battery pack and vehicle equipped with it - Google Patents

Description

The present disclosure relates to a battery pack and a vehicle equipped with it.

US Pat. No. 8,833,499 discloses a prior art related to a battery pack for an electric vehicle and a vehicle equipped with it. However, this prior art has problems to be solved.

U.S. Pat. No. 8,833,499

One of the problems to be solved is to suppress the vibration of the upper case of the battery pack. In the prior art described above, a blocking layer for sound insulation, heat insulation, and vibration damping is provided between the lower surface of the floor of the vehicle body and the upper case of the battery pack. However, it is difficult to say that the vibration of the upper case of the battery pack can be sufficiently suppressed simply by providing the insulating layer.

The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a battery pack that can suppress vibration of the upper case of the battery pack, and a vehicle equipped with the battery pack.

A battery pack according to the present disclosure is a battery pack that is installed under the floor of a vehicle. and a support member extending upward from the rigid body to support the upper case from the rear surface. With this configuration, the upper case can be supported from below, so vibration of the upper case can be suppressed.

In the battery pack according to the present disclosure, the support member may support the upper case from the back surface at the central portion in the width direction of the battery pack. Vibration of the upper case can be suppressed by supporting the central portion of the upper case, which tends to bend, from below with the supporting member.

In the battery pack according to the present disclosure, the battery pack may include an elastic member provided on the surface of the upper case and sandwiched between the upper case and the lower surface of the floor. In such a configuration, the vibration of the upper case can be suppressed by sandwiching the upper case from above and below with the elastic member and the support member. In particular, by using an elastic member on one side instead of sandwiching the upper case between rigid bodies, the vibration generated in the upper case can be absorbed by the elastic member.

In the battery pack according to the present disclosure, a plurality of supporting members may be provided in the front-rear direction of the battery pack. Further, the elastic member may be arranged so that the position of the elastic member in the front-rear direction of the battery pack is positioned between two adjacent support members when the battery pack is viewed from the side. In such a configuration, the support members are arranged in front of and behind the elastic member, so that the upper case can be stably supported between them and the elastic member.

In the battery pack according to the present disclosure, a plurality of support members may be provided in the width direction of the battery pack. Further, the elastic member may be arranged so that the position of the elastic member in the width direction of the battery pack is positioned between two adjacent support members when the battery pack is viewed from the front. In such a configuration, the support members are arranged on both sides of the elastic member, so that the upper case can be stably supported between them and the elastic member.

In the battery pack according to the present disclosure, a rib protruding downward may be provided on the back surface of the upper case, and the rib may be supported by the support member of the upper case. In such a configuration, the upper case can be stably supported by the highly rigid rib coming into contact with the supporting member.

In the battery pack according to the present disclosure, multiple ribs may be spaced apart from each other, and cables may be passed between the ribs. In such a configuration, the cables can be laid out without being obstructed by the ribs.

In the battery pack according to the present disclosure, a plurality of ribs protruding downward may be provided on the back surface of the upper case in the front-rear direction of the battery pack, and the upper case may support the plurality of ribs by a supporting member. Further, the elastic member may be arranged such that the position of the elastic member in the front-rear direction of the battery pack is positioned between two adjacent ribs when the battery pack is viewed from the side. In such a configuration, the ribs abutting against the support member are arranged in front and behind the elastic member, so that the upper case can be stably supported between the support member and the elastic member.

In the battery pack according to the present disclosure, a plurality of ribs protruding downward may be provided on the back surface of the upper case in the width direction of the battery pack, and the upper case may support the plurality of ribs by a supporting member. Further, the elastic member may be arranged so that the position of the elastic member in the width direction of the battery pack is positioned between two adjacent ribs when the battery pack is viewed from the front. In such a configuration, the ribs abutting against the support member are arranged on both sides of the elastic member, so that the upper case can be stably supported between the support member and the elastic member.

In the battery pack according to the present disclosure, a plurality of support members may be arranged in two rows in the front-rear direction of the battery pack at the center in the width direction of the battery pack, and the upper ends of the plurality of support members arranged in two rows may be arranged in two rows. Alternatively, a center plate extending in the front-rear direction of the battery pack may be hung over the center plate, and the rib may be in contact with the center plate. In such a configuration, a plurality of support members arranged in two rows are joined via the center plate, thereby increasing the rigidity of the entire support structure that supports the upper case and stably supporting the upper case. can do.

In the battery pack according to the present disclosure, flat surfaces contacting the ribs may be formed at both ends of the center plate in the width direction of the battery pack, and a cable passes through the central portion of the center plate in the width direction of the battery pack. A depression may be formed. In such a configuration, the ribs with high rigidity abut on the flat surface of the center plate to stably support the upper case, and the cables passing through the depressions of the center plate are not obstructed by the ribs. Cables can be placed without

In the battery pack according to the present disclosure, the upper case is formed in a stepped shape with a lower front portion in the front-rear direction of the battery pack and a higher rear portion. The longer side may be supported by a support member. With such a configuration, at least the less rigid side of the front portion and the rear portion of the upper case can be stably supported.

In the battery pack according to the present disclosure, the support member may be a plate whose cross section perpendicular to the up-down direction of the battery pack is processed into a hat shape. In such a configuration, the upper case can be stably supported by ensuring high rigidity of the supporting member.

The battery pack according to the present disclosure may include an inner lateral reinforcing member provided inside the lower case and extending in the width direction of the battery pack, and the supporting member may be fixed to the inner lateral reinforcing member. With such a configuration, the rigidity of the lower case can be increased by the inner lateral reinforcing member while the support member is fixed to the rigid inner lateral reinforcing member, so that the upper case can be stably supported.

A battery pack according to the present disclosure may include a bracket extending in the width direction of the battery pack and joined to the inner lateral reinforcing member with fasteners, and the support member may be joined to the bracket. With such a configuration, the support member can be firmly fixed to the inner lateral reinforcing member via the bracket, and the rigidity of the lower case can be further increased by the bracket, so that the upper case can be stably supported.

In the battery pack according to the present disclosure, the plurality of inner lateral reinforcing members may be arranged side by side in the front-rear direction of the battery pack, and the plurality of battery stacks are aligned with their longitudinal directions facing the width direction of the battery pack. It may be arranged between two longitudinally aligned inner lateral reinforcing members. Each of the plurality of battery stacks has a plurality of claw portions on both sides in the short direction of the battery stack, and the plurality of claw portions are fixed to the inner lateral reinforcing member by sandwiching the plurality of claw portions between the inner lateral reinforcing member and the bracket. good. In such a configuration, since the two adjacent inner lateral reinforcing members are joined by the battery stack, the overall rigidity of the support structure for supporting the upper case is further increased, and the upper case can be stably supported. .

The battery pack according to the present disclosure may include an outer lateral reinforcing member provided on the outer side of the lower case and extending in the width direction of the battery pack, and the plurality of inner lateral reinforcing members and the plurality of outer lateral reinforcing members are arranged in the front and rear of the battery pack. They may be arranged alternately in the direction. Each of the outer lateral reinforcing members may be joined to two adjacent inner lateral reinforcing members together with the lower case. In such a configuration, since the two adjacent inner lateral reinforcing members are joined by the outer lateral reinforcing member with the lower case interposed therebetween, the overall rigidity of the support structure for supporting the upper case is further increased, and the upper case is stabilized. can be supported by When each of the outer lateral reinforcing members is welded together with the lower case to two adjacent inner lateral reinforcing members, the liquid tightness of the lower case can be ensured.

The battery pack according to the present disclosure may include an outer vertical reinforcing member provided outside the lower case and extending in the longitudinal direction of the battery pack, and the outer vertical reinforcing member sandwiches a plurality of outer horizontal reinforcing members with the lower case. , may be joined to the lower case together with a plurality of outer lateral reinforcing members. In such a configuration, the plurality of outer lateral reinforcing members arranged in the width direction of the battery pack are joined by the outer longitudinal reinforcing members, so that the rigidity of the entire support structure for supporting the upper case is further increased, and the upper case is stabilized. can be supported by When the outer longitudinal reinforcing member is welded to the lower case together with the plurality of outer lateral reinforcing members, the liquid tightness of the lower case can be ensured.

In the battery pack according to the present disclosure, a plurality of support members may be arranged side by side in the front-rear direction of the battery pack at the center in the width direction of the battery pack, and the outer vertical reinforcing member may be arranged below the plurality of support members arranged side by side. may be provided in With such a configuration, it is possible to increase the rigidity of the lower case at the portion where the support member is arranged, so that the upper case can be stably supported.

In the battery pack according to the present disclosure, the upper case and the support member may be joined with fasteners. With such a configuration, the upper case can be fixed to the support member with a simple configuration. In addition, the fastening portion of the fastener may be sealed with a sealing material.

A vehicle according to the present disclosure includes a battery pack installed under the floor of the vehicle, and an elastic member sandwiched between the lower surface of the floor and the battery pack. The battery pack includes a lower case on which the battery stack is placed and fixed under the floor, an upper case attached to the lower case and having an elastic member placed on the surface thereof, and an upper case extending upward from a rigid body composed of the battery stack and the lower case. and a support member that supports the case from the back surface. Any configuration of the battery pack according to the present disclosure may be applied to the vehicle battery pack according to the present disclosure. According to this configuration, the vibration of the upper case can be suppressed by sandwiching the upper case from above and below with the elastic member and the support member. In particular, by using an elastic member on one side instead of sandwiching the upper case between rigid bodies, the vibration generated in the upper case can be absorbed by the elastic member.

As described above, according to the battery pack according to the present disclosure and the vehicle equipped with the battery pack, vibration of the upper case of the battery pack can be suppressed. Also, all the above-mentioned features and advantages, as well as other features and advantages, of the present disclosure will become further apparent by an exemplary and non-limiting description that refers to the accompanying drawings. In the attached drawings, common reference numerals are used for the same elements in different drawings.

1 is a side view showing the structure of a vehicle according to an embodiment; FIG. FIG. 2 is a perspective view from diagonally upper left front showing the appearance of the battery pack according to the embodiment; FIG. 2 is a diagram showing the structure of the battery pack according to the embodiment, and is a perspective view of the battery pack with the upper case, the heating/cooling device, and the cables removed, as viewed diagonally from the upper left front. 1 is a perspective view showing an appearance of a battery stack incorporated in a battery pack according to an embodiment; FIG. FIG. 10 is a perspective view of the lower case, obliquely from the upper left front, in a state where the reinforcement and the arm for fixing the case are attached; FIG. 4 is a plan view of the lower case with the reinforcement and the arm for fixing the case attached. FIG. 10 is a bottom view of the lower case with the reinforcement and the arm for fixing the case attached. FIG. 10 is a perspective view from the diagonally upper left front showing the structure of the case fixing side arm and its surroundings. It is a perspective view from the diagonal upper left front which shows a middle frame and its supporting structure. FIG. 10 is a perspective view of the lower case when the lower case is cut along the center line in the front-rear direction of the battery pack with the middle frame attached to the lower case and viewed diagonally from the upper left front; FIG. 10 is a perspective view of the lower case when the middle frame is attached to the lower case and viewed from the upper left front in an enlarged manner; FIG. 10 is a perspective view of the front portion of the lower case when the lower case is cut along the center line in the front-rear direction of the battery pack with the middle frame attached to the lower case, and the lower case is enlarged and viewed obliquely from the upper left front; FIG. 4 is a perspective view of the front portion of the lower case when the middle frame and the battery stack are attached to the lower case, the lower case is cut along the center line in the front-rear direction of the battery pack, and the lower case is enlarged from the upper left front. be. FIG. 10 is a perspective view of the front portion of the lower case when the lower case is cut along the center line in the front-rear direction of the battery pack with the middle frame attached to the lower case, and is viewed obliquely from the lower left; FIG. 4 is a cross-sectional view schematically showing an enlarged joint portion between the bottom panel of the lower case, the inner lateral reinforcement, and the outer lateral reinforcement; FIG. 4 is a cross-sectional view schematically showing an enlarged joint portion between the bottom panel of the lower case, the outer lateral reinforcement, and the outer central longitudinal reinforcement. FIG. 4 is a plan view schematically showing the engagement relationship between the center plate and the frame of the second floor; Fig. 10 is a longitudinal sectional view schematically showing the engagement relationship between the center plate, the support legs and the frame of the second floor; Fig. 10 is a horizontal cross-sectional view schematically showing the structure of the second floor; FIG. 10 is a perspective view of the rear portion of the lower case when the lower case is cut along the center line in the front-rear direction of the battery pack while the middle frame is attached to the lower case, and the lower case is enlarged and viewed obliquely from the upper left rear. FIG. 10 is a side view of the rear portion of the lower case when the lower case is cut along the longitudinal center line of the battery pack with the middle frame attached to the lower case, and is enlarged from the left side; FIG. 10 is a perspective view of the rear portion of the lower case when the lower case is cut along the center line in the front-rear direction of the battery pack with the middle frame attached to the lower case and viewed obliquely from the lower left. FIG. 4 is a perspective view showing the structure of the outer rear end portion of the lower case to which the case-fixing rear arm is attached; FIG. 10 is a perspective view of the bottom surface of the right rear portion of the lower case when viewed in an enlarged manner from the lower left; FIG. 11 is a perspective view of the bottom surface of the left rear of the lower case when viewed from the left obliquely lower rear in an enlarged manner; FIG. 4 is a perspective view of the lower case with the middle frame and the heating/cooling device attached and viewed obliquely from the upper left front. A perspective view of the front part of the lower case when the middle frame and the heating/cooling device are attached to the lower case, and the lower case is cut along the center line in the front-rear direction of the battery pack and enlarged from the upper left rear. It is a diagram. A perspective view of the front portion of the lower case when the middle frame and the heating/cooling device are attached to the lower case, and the lower case is cut along the center line in the front-rear direction of the battery pack and enlarged greatly from the upper left. It is a diagram. Side view of the front part of the lower case when the middle frame and the heating/cooling device are attached to the lower case, and the lower case is cut along the center line in the front-rear direction of the battery pack and viewed greatly enlarged from the left side. is. FIG. 4 is a perspective view of the front portion of the lower case when viewed obliquely from the upper left front in a state where the battery stack, middle frame, cables, and heating/cooling device are attached to the lower case; FIG. 4 is a perspective view of the periphery of the center plate when the battery pack is cut in its width direction and viewed obliquely from the front. Side view of the front part of the lower case, with the middle frame, the heating/cooling device, and the battery stack attached to the lower case, cut along the center line in the front-rear direction of the battery pack, and viewed greatly enlarged from the left side. is. With the middle frame, battery stack, and heating/cooling device attached to the lower case, the lower case is cut along the center line in the front-back direction of the battery pack, and the area around the partition bracket when viewed from the left side. It is a side view. FIG. 2 is a perspective view from the diagonally lower left rear showing how the battery pack according to the embodiment is mounted in a vehicle; 1 is a perspective view showing in detail a frame structure under a floor of a vehicle according to an embodiment; FIG. FIG. 2 is a perspective view showing in detail the skeleton structure of the rear section of the vehicle according to the embodiment; 1 is a perspective view showing in detail the structure of a rear suspension for a vehicle according to an embodiment; FIG. 1 is a diagram showing a floor structure of a vehicle according to an embodiment, in which the floor is installed along the center line in the longitudinal direction of the vehicle with a battery pack that is not equipped with a battery stack and a heating/cooling device mounted under the floor; Fig. 3 is a perspective view of the front part of the floor when cut; FIG. 4 is a perspective view showing an engagement state between the battery pack and the frame structure under the floor when the battery pack is mounted under the floor of the vehicle according to the embodiment; FIG. 4 is a bottom view showing a state where the battery pack is mounted under the floor of the vehicle according to the embodiment; FIG. 4 is a bottom view showing the positional relationship between the battery stack and the floor when the battery pack is mounted under the floor of the vehicle according to the embodiment; FIG. 4 is a bottom view showing a reinforcing structure under the floor of the vehicle according to the embodiment; It is a bottom view which shows the state which attached the undercover under the floor of the vehicle which concerns on embodiment. FIG. 3 is a left side view of the rear part of the floor showing a state where the battery pack is mounted under the floor of the vehicle according to the embodiment; FIG. 2 is a front view showing a state in which the battery pack is mounted under the floor of the vehicle according to the embodiment, and is a front view of a cut surface in the width direction of the floor and the battery pack. FIG. 10 is an enlarged perspective view of the rear end of the lower case from the lower left rear, showing a state in which the case-fixing rear arm of the battery pack is attached to the lower cross member of the rear floor; FIG. 10 is a side view of the rear part of the floor and the battery pack when the floor and the battery pack are cut along the longitudinal center line of the vehicle with the battery pack mounted under the floor and viewed enlarged from the left side; . FIG. 4 is a cross-sectional view schematically showing an enlarged joint portion between the rear floor lower cross member, the rear floor upper cross member, and the floor panel; FIG. 5 is a diagram schematically showing the details of the structure for fixing the case-fixing rear arm to the cross member under the rear floor; FIG. 10 is a view showing the support structure of the upper case, showing the left side of the floor cut along the longitudinal center line of the vehicle with the battery pack without the battery stack and the heating/cooling device mounted under the floor. FIG. 4 is a perspective view of a floor and a battery pack when seen from an oblique lower front side; FIG. 4 is a diagram showing the support structure of the upper case, and is a schematic front view of the periphery of the center plate when the floor and battery pack are cut in the width direction and viewed from the front. FIG. 4 is a diagram showing the support structure of the upper case, showing the floor and the upper case when the floor is cut along the longitudinal center line of the vehicle with the battery pack mounted under the floor, and the left side is enlarged. 4 is a side view of the battery pack; FIG. FIG. 4 is a schematic vertical cross-sectional view showing an engagement state of a first elastic member with a first pedestal formed on the floor panel; FIG. 10 is a diagram showing the state of engagement of the first elastic member with the first base formed on the floor panel, and is a perspective view of the periphery of the first base of the floor panel viewed obliquely from below. FIG. 10 is a diagram showing the state of engagement of the second elastic member with the second seat formed on the floor panel, and is a perspective view of the periphery of the second seat of the floor panel viewed obliquely from below. FIG. 5 is a schematic longitudinal sectional view showing a modification of the support structure of the upper case; FIG. 5 is a diagram for explaining actions and effects of the vehicle underfloor and battery pack reinforcement structure according to the embodiment; FIG. 37 is a supplemental view of FIG. 36 and is a schematic cross-sectional view of the cyclic skeleton; FIG. 22 is a supplementary view of FIG. 21, and is a perspective view showing details around a welding point at the rear end of the lower case. FIG. 5 is a schematic longitudinal sectional view showing a modification of the structure of the rear end portion of the lower case to which the case fixing rear arm is fixed; FIG. 5 is a diagram for explaining actions and effects of the vehicle underfloor and battery pack reinforcement structure according to the embodiment; FIG. 29 is a supplementary view of FIG. 28 and is a schematic plan view when the air guide plate is cut parallel to the bottom surface of the lower case of the battery pack and viewed from above.

The following is a table of contents showing the contents to be described in the embodiments of the present disclosure and the order of description.
<Contents>
1. Vehicle Overview Paragraphs [0030]-[0032]
2. Battery pack 2-1. Battery pack appearance and outline Paragraphs [0034]-[0050]
2-2. Details of reinforcement structure of lower case Paragraph [0051]-[0083]
2-3. Structure of Middle Frame Paragraph [0084]-[0096]
2-4. Middle frame support structure details Paragraphs [0097]-[0106]
2-5. Details of joint structure between reinforcing members Paragraph [0107]-[0119]
2-6. Second Floor Frame Structure Details Paragraphs [0120]-[0125]
2-7. Details of the rear end of the lower case Paragraphs [0126]-[0142]
2-8. Heating/cooling device Paragraphs [0143]-[0153]
2-9. Cable laying structure Paragraphs [0154]-[0159]
2-10. Fixing structure of battery stack Paragraph [0160]-[0165]
3. Body structure 3-1. OVERVIEW OF BODY STRUCTURE Paragraphs [0167]-[0173]
3-2. Body frame structure Paragraphs [0174]-[0193]
3-3. Battery pack under-floor mounting structure Paragraphs [0194]-[0209]
3-4. Attachment structure for the rear end of the battery pack Paragraphs [0210]-[0217]
3-5. Support structure for upper case Paragraphs [0218]-[0229]
4. Features and Benefits 4-1. Support from below the upper case with support legs
Paragraphs [0231]-[0240]
4-2. Connection structure of inner lateral reinforcement by outer lateral reinforcement
Paragraph [0241]
4-3. Connection structure of outer lateral reinforcement by outer longitudinal reinforcement
Paragraphs [0242]-[0245]
4-4. Three-dimensional reinforcement of battery pack by middle frame Paragraph [0246]-[0247]
4-5. Installation of elastic members in the gap between the floor panel and the upper case
Paragraphs [0248]-[0251]
4-6. Reinforcement of Vehicle Frame by Reinforcement Structure of Battery Pack Paragraph [0252]-[0255]
4-7. Supporting the battery pack by the cross member that constitutes the annular frame
Paragraphs [0256]-[0259]
4-8. Suspension support of the rear end of the battery pack by the cross member under the rear floor
Paragraphs [0260]-[0261]
4-9. Closed section structure of the rear end of the lower case Paragraphs [0262]-[0263]
4-10. Outer side longitudinal reinforcement by outside corner reinforcement and
Connection with Lateral Reinforcement of Rear End Paragraph [0264]
4-11. Battery stack support with multiple reinforcement Paragraphs [0265]-[0266]
4-12. Battery pack protection by outer lateral reinforcement and outer longitudinal reinforcement
Paragraph [0267]-[0268]
4-13. Arrangement of baffle plates on inner and lateral reinforcement Paragraph [0269]
4-14. Protection of battery stacks by air ducts Paragraph [0270]
4-15. Alternate arrangement of left and right air distribution sections Paragraph [0271]
4-16. Inclined arrangement of the baffle plate from the air distribution side to the opposite side Paragraph [0272]
5. Other Paragraph [0273]
Hereinafter, description will be given in order according to the table of contents.

1. Outline of Vehicle An outline of a vehicle according to an embodiment of the present disclosure will be described with reference to FIG.

FIG. 1 is a side view showing the structure of vehicle 100 according to the embodiment. Vehicle 100 is an electric vehicle that uses an electric motor as a power unit. Electric motors are powered by an electrical power supply. Vehicle 100 includes a battery pack 200 that stores electric power to be supplied to the electric motor. Battery pack 200 accommodates a plurality of rechargeable batteries (battery stack).

Battery pack 200 is mounted under floor panel 102 constituting vehicle body 101 of vehicle 100 . Battery pack 200 is provided between front wheel 103 and rear wheel 104 in the longitudinal direction of vehicle 100 . The battery pack 200 is mounted so that its front side is positioned directly below the front seat 105 and its rear side, which is one step higher than the front side, is positioned directly below the rear seat 106 . Battery pack 200 is attached to floor panel 102 in a form that can be replaced as needed.

2. Battery Pack A battery pack 200 according to an embodiment will be described.

2-1. Appearance and Overview of Battery Pack First, the appearance and overview of the battery pack 200 will be described with reference to FIGS. 2 to 4. FIG.

FIG. 2 is a perspective view of the appearance of the battery pack 200 from the diagonally upper left front. First, here, the longitudinal direction of the vehicle is defined as the longitudinal direction of battery pack 200 , the width direction of the vehicle is defined as the width direction of battery pack 200 , and the vertical direction of the vehicle is defined as the vertical direction of battery pack 200 . Arrows FR and UP shown in the drawings described below point forward in the longitudinal direction of the battery pack 200 and upward in the vertical direction of the battery pack 200, respectively. pointing to the right. The opposite directions of the arrows FR, UP, and RH indicate the rear of the battery pack 200, the lower side of the battery pack 200, and the left side of the battery pack 200 (LH). In the following description, when simply using the front-rear, left-right, and up-down directions, the front-rear direction of the battery pack 200, the left-right direction of the width direction of the battery pack 200, and the up-down direction of the battery pack 200, unless otherwise specified. shall indicate Further, in plan view, the longitudinal centerline of battery pack 200 coincides with the longitudinal centerline of the vehicle. Here, the front-rear centerline is an imaginary line (not shown) passing through the widthwise center of the vehicle along the front-rear direction. Battery pack 200 is substantially symmetrical with respect to the center line.

Shown in FIG. 2 is the outer shell of the battery pack 200 . The outer shell of battery pack 200 is composed of upper case 210 positioned above and lower case 300 positioned below. The upper case 210 is made of, for example, light metal, resin (partially made of resin), or steel plate. Lower case 300 is made of steel, for example. It should be noted that each component constituting battery pack 200 is made of metal such as steel plate or aluminum, unless otherwise specified or clearly specified in principle.

The upper case 210 has a shape like an inverted bathtub. Upper case 210 is formed in a stepped shape with a low front portion and a high rear portion in the front-rear direction of battery pack 200 . Hereinafter, the front portion of the upper case 210 with a relatively low ceiling may be referred to as a low ceiling portion 211 , and the rear portion of the upper case 210 with a relatively high ceiling may be referred to as a high ceiling portion 212 . Low ceiling portion 211 is longer than high ceiling portion 212 in the front-rear direction of battery pack 200 .

A central raised portion 213 extending in the front-rear direction is formed in the widthwise center of the low ceiling portion 211 of the upper case 210 . A service plug 750 protrudes upward from the interior of battery pack 200 from central raised portion 213 . Cables connected to the service plug 750 are stored under the central raised portion 213 . When battery pack 200 is mounted in a vehicle, service plug 750 is connected to a connector on the vehicle side. The opening through which the service plug 750 penetrates in the central raised portion 213 is sealed by a sealing member 215 made of resin, for example.

The upper case 210 is longer in the front-rear direction than in the width direction, and has a constant width except for the tip portion. A tip portion of the upper case 210 is gradually tapered toward the tip. A front protuberance 214 protruding further than the central protuberance 213 is formed at the tip of the upper case 210 . A junction box and a blower, which will be described later, are arranged under the front raised portion 214 . The front raised portion 214 and the central raised portion 213 also serve to increase the rigidity of the low ceiling portion 211 . Aside from these, the low ceiling portion 211 is formed with a plurality of reinforcing grooves 216 extending in the lateral width direction from the central raised portion 213 .

Two elastic members 231 and 232 are arranged side by side in the front-rear direction on the central raised portion 213 of the upper case 210 . These elastic members 231 and 232 are, for example, rubber, sponge, or springs. Details of the positions where the elastic members 231 and 232 are arranged and their roles will be described later.

A flange 220 is formed around the upper case 210 . Similarly, a flange 310 is also formed around the lower case 300 . Upper case 210 is fixed to lower case 300 by aligning flange 220 of upper case 210 with flange 310 of lower case 300 and fastening them together with fasteners.

The lower case 300 is provided with a plurality of case fixing side arms 410, 420, 430, 440 extending in the width direction from both left and right sides thereof. Case fixing side arms 410 , 420 , 430 , 440 are attached to the bottom surface of the floor by hanging bolts 400 , 404 . Although hidden behind other parts in FIG. 2, the lower case 300 is also provided with a rear arm 460 for fixing the case. The case fixing rear arm 460 is attached to the bottom surface of the floor by fasteners (bolts and nuts) 470 .

FIG. 3 is a perspective view of the battery pack 200 viewed obliquely from the upper left front with the upper case 210, a heating/cooling device (to be described later), and cables removed. A plurality of rectangular parallelepiped battery stacks 900 are accommodated inside the battery pack 200 . The battery stacks 900 are arranged side by side in the front-rear direction of the lower case 300 (same as the front-rear direction of the battery pack 200) with their longitudinal directions oriented in the width direction of the lower case 300 (same as the width direction of the battery pack 200). .

Lower case 300 is provided with a middle frame consisting of second floor 360 and center plate 370 . Second floor 360 is a second mounting surface for battery stacks 900 located higher than the bottom surface of lower case 300 , and three battery stacks 900 are mounted side by side in the longitudinal direction of lower case 300 . Among the battery stacks 900 placed on the second floor 360, the battery ECUs 950 and 951 that control charging/discharging of the battery stack 900 and a heating/cooling device, which will be described later, are arranged on the battery stack 900 located at the forefront. It is Although not shown, three battery stacks 900 are also placed under the second floor 360 .

Center plate 370 is provided in the central portion of lower case 300 at a position higher than the bottom surface of lower case 300 . Center plate 370 extends in the front-rear direction of lower case 300 from second floor 360 toward the tip of lower case 300 . The tip of center plate 370 extends beyond the range where battery stack 900 is placed and reaches the tip of lower case 300 where junction box 760 and the like are installed. Five battery stacks 900 are placed under the center plate 370 . Therefore, the number of battery stacks 900 placed in lower case 300 is 11, which is the total of 8 placed in the first stage and 3 placed in the second stage.

The details of the center plate 370 will be described later, but one of its roles is as a path for cables (not shown). A service plug 750 is mounted on the center plate 370 . Cables connected to junction box 760 installed at the tip of lower case 300 , cables connected to battery ECUs 950 and 951 , and cables connected to service plug 750 are passed over center plate 370 .

FIG. 4 is a perspective view showing the appearance of the battery stack 900. As shown in FIG. The battery stack 900 is configured by stacking a plurality of battery cells 901 in the longitudinal direction of the battery stack 900 (also referred to as the length direction of the battery stack 900). The battery cell 901 is, for example, a lithium ion battery, a nickel metal hydride battery, an all-solid battery, a lead battery, or the like. A plurality of stacked battery cells 901 are housed in a cell case 920 with both longitudinal ends of the battery stack 900 pressed by end plates 910 . A power distribution facility 905 is attached to the upper surface of the battery stack 900 .

Stack support brackets 912 for restricting movement of the battery stack 900 in the longitudinal direction are joined to both longitudinal side surfaces of the battery stack 900 . Stack support bracket 912 has a substantially L-shape and is fixed to the bottom surface of lower case 300 via other members.

A partition bracket 340 is installed in the lateral direction of the battery stack 900 (also referred to as the width direction of the battery stack 900) to partition another adjacent battery stack 900. As shown in FIG. Partition bracket 340 has a base portion 341 fixed to the bottom surface of lower case 300 via another member, and a partition wall 342 provided perpendicular to base portion 341 .

The partition bracket 340 also has a cell case fixing portion 343 . The cell case fixing portion 343 is perpendicular to the partition wall 342 like the base portion 341 , but forms a gap with the bottom surface of the lower case 300 . The cell case 920 is formed with claws that are hidden in the drawing. Battery stack 900 is fixed to lower case 300 by the claw portion entering into cell case fixing portion 343 .

2-2. Details of Reinforcing Structure of Lower Case Details of the reinforcing structure of the lower case 300 will be described with reference to FIGS. 5 to 8. FIG.

FIG. 5 is a perspective view of the lower case 300 in a state in which various reinforcements and arms for fixing the case are attached, as seen diagonally from the upper left front. The lower case 300 has a bathtub shape in which a bottom panel 301 is lower than the edge, and a flange 310 is formed on the edge. 2 and 3, the case-fixing rear arm 460 extends upward from the rear end of the lower case 300, although it is hidden behind other components.

A bottom panel 301 of the lower case 300 is provided with a plurality of inner lateral reinforcements 320 as inner lateral reinforcing members. The inner lateral reinforcements 320 are arranged side by side in the front-rear direction of the lower case 300 with their longitudinal directions facing the width direction of the lower case 300 . The rear end of the bottom panel 301 of the lower case 300 is provided with an inner lateral reinforcement 330 having a shape different from that of the others.

The inner lateral reinforcements 320 and 330 have lengths from the right end to the left end of the bottom panel 301 in the width direction of the lower case 300 . Although it will be described in detail later, the inner lateral reinforcement 320 has a hat-shaped cross section that opens downward, and the inner lateral reinforcement 330 has a Z-shaped cross section. The inner lateral reinforcements 320 and 330 are joined to the bottom panel 301 of the lower case 300 by welding. A partition bracket 340 is joined to each of the inner and lateral reinforcements 320 and 330 with fasteners.

A bottom panel 301 of the lower case 300 is shallower at its tip than other parts. At the tip of the bottom panel 301 of the lower case 300, an inner tip longitudinal reinforcement 358 extending in the longitudinal direction of the lower case 300 is provided.

Fixed bases 350 extending in the longitudinal direction of the lower case 300 are provided on both sides in the width direction of the bottom panel 301 of the lower case 300 . The fixed base 350 is joined to the bottom panel 301 of the lower case 300 by welding, for example. The fixing base 350 is a member for fixing the battery stack 900 , and stack support brackets 912 are joined on the fixing base 350 at intervals where the battery stacks 900 are arranged. Both ends of the inner lateral reinforcements 320 and 330 overlap the fixed base 350 .

FIG. 6 is a plan view of the lower case 300 to which various reinforcements and arms for fixing the case are attached. The inner surface of the bottom panel 301 of the lower case 300 is formed with a plurality of reinforcing recesses 302a-302g. The reinforcing recesses 302a are recesses that extend from end to end in the width direction of the lower case 300, and are located between the first to fifth inner lateral reinforcements 320 from the front and between the seventh and eighth inner lateral reinforcements 320 from the front. It is formed between the lateral reinforcements 320 respectively.

Reinforcement recesses 302 b and 302 c are provided at the tip of bottom panel 301 of lower case 300 . An inner tip vertical reinforcement 358 is laid over the reinforcing recesses 302b and 302c.

The reinforcing recesses 302e and the reinforcing recesses 302d are formed between the fifth to seventh inner lateral reinforcements 320 from the front. The reinforcing recess 302e is formed in the center of the lower case 300 in the width direction. The reinforcing recesses 302d are formed on both sides of the reinforcing recesses 302e in the width direction of the lower case 300. As shown in FIG.

The reinforcing recess 302g and the reinforcing recess 302f are formed between the eighth inner lateral reinforcement 320 and the last inner lateral reinforcement 330 from the front. The reinforcing recess 302g is formed in the center of the lower case 300 in the width direction. The reinforcing recesses 302f are formed on both sides of the reinforcing recesses 302g in the width direction of the lower case 300. As shown in FIG.

FIG. 7 is a bottom view of the lower case 300 to which various reinforcements and arms for fixing the case are attached. A plurality of outer lateral reinforcements 510, 520, 530, 540, 550, 560 are provided on the bottom surface of the lower case 300 as outer lateral reinforcing members. Outer lateral reinforcements 510 , 520 , 530 , 540 , 550 , 560 are arranged side by side in the longitudinal direction of lower case 300 with their longitudinal directions facing the width direction of lower case 300 .

Outer lateral reinforcements 510 , 520 , 530 , 540 , 550 , 560 have lengths from the right end to the left end of bottom panel 301 in the width direction of lower case 300 . Also, the outer lateral reinforcements 510, 520, 530, 540, 550, 560 are wider in width (length in the lateral direction) than the inner lateral reinforcement 320 (see FIG. 6). As will be described in detail later, the outer lateral reinforcements 510, 520, 530, 540, 550, 560 have a hat-shaped cross-sectional shape that opens upward. The outer lateral reinforcements 510, 520, 530, 540, 550, 560 are joined to the bottom panel 301 of the lower case 300 by welding.

Outer lateral reinforcements 510 and 520 are provided at the tip of the bottom surface of lower case 300 . Lateral reinforcement 510 is the shortest lateral reinforcement, and lateral reinforcement 520 is the next shortest lateral reinforcement. Reinforcing concave portions 302b and 302c are formed inside the portions of the bottom panel 301 to which the outer lateral reinforcements 510 and 520 are attached. Extension plates 412 extending outward in the width direction of the lower case 300 are joined to both ends of the outer lateral reinforcement 510 . However, the extension plate 412 may be formed integrally with the lateral reinforcement 510 . Extension plates 422 extending outward in the width direction of the lower case 300 are joined to both ends of the outer lateral reinforcement 520 . The extension plate 422 may be formed integrally with the lateral reinforcement 520 .

Four outer lateral reinforcements 530 are densely arranged from the lateral sides of the outer lateral reinforcements 520 . The four outer lateral reinforcements 530 have the same length and the same shape. A reinforcing recess 302a is formed inside the portion of the bottom panel 301 to which the outer lateral reinforcement 530 is attached. That is, the five inner lateral reinforcements 320 on the inner side and the four outer lateral reinforcements 530 on the outer side are alternately arranged in the longitudinal direction of the lower case 300 . In other words, each outer lateral reinforcement 530 is arranged to connect two adjacent inner lateral reinforcements 320 . Extension plates 432 extending outward in the width direction of the lower case 300 are joined to both ends of the outer lateral reinforcement 530 . However, the extension plate 432 may be formed integrally with the outer lateral reinforcement 530 .

The outer lateral reinforcement 540 is provided on the opposite side of the sixth inner lateral reinforcement 320 from the front across the bottom panel 301 . Since the outer lateral reinforcement 540 is wider than the inner lateral reinforcement 320, the inner lateral reinforcement 320 is within the width of the outer lateral reinforcement 540 in plan view.

The outer lateral reinforcement 550 is provided on the opposite side of the reinforcing recess 302a formed between the seventh and eighth inner lateral reinforcements 320 from the front. In other words, the outer lateral reinforcement 550 is arranged to connect the seventh and eighth inner lateral reinforcements 320 from the front.

The outer lateral reinforcement 560 is arranged at the rear end of the bottom panel 301 of the lower case 300 . Further, the outer lateral reinforcement 560 is provided on the opposite side of the inner lateral reinforcement 330 (see FIG. 6) at the rear end with the bottom panel 301 interposed therebetween. Since the outer lateral reinforcement 560 is wider than the inner lateral reinforcement 330, the inner lateral reinforcement 330 is within the width of the outer lateral reinforcement 560 in plan view.

The bottom surface of the lower case 300 is provided with outer central longitudinal reinforcements 610 and 620 as outer longitudinal reinforcing members. Each of the outer central longitudinal reinforcements 610, 620 has a hat-shaped cross-sectional shape with at least a part thereof facing upward. The outer central longitudinal reinforcements 610 and 620 are arranged at the widthwise center of the lower case 300 with their longitudinal directions facing the front-rear direction of the lower case 300 .

The outer central longitudinal reinforcement 610 has a length connecting the outer lateral reinforcement 510 and the four outer lateral reinforcements 530 . The outer central longitudinal reinforcement 610 sandwiches the outer lateral reinforcements 510, 520, 530 with the bottom panel 301 of the lower case 300, and joins the outer lateral reinforcements 510, 520, 530 to the bottom panel 301 of the lower case 300 by welding. It is

The outer central longitudinal reinforcement 620 has a length that connects the outer lateral reinforcement 540 to the outer lateral reinforcement 560 . The outer central longitudinal reinforcement 620 sandwiches the outer lateral reinforcements 540, 550, 560 with the bottom panel 301 of the lower case 300, and is joined to the bottom panel 301 of the lower case 300 together with the outer lateral reinforcements 540, 550, 560 by welding. It is The rear end of the outer central longitudinal reinforcement 610 and the front end of the outer central longitudinal reinforcement 620 are joined by welding.

Outer side longitudinal reinforcements 630 , 640 , 650 and an outer corner reinforcement 660 are provided on both left and right sides of the bottom surface of the lower case 300 with the outer center longitudinal reinforcements 610 , 620 interposed therebetween. Each of the reinforcements 630, 640, 650, 660 has a hat-shaped cross-sectional shape with at least a part thereof facing upward.

The outer side vertical reinforcement 630 is arranged with its longitudinal direction facing the front-rear direction of the lower case 300 . The outer side longitudinal reinforcement 630 has a length connecting the outer lateral reinforcement 520 and the four outer lateral reinforcements 530 . The outer side vertical reinforcement 630 sandwiches the outer lateral reinforcements 520, 530 with the bottom panel 301 of the lower case 300, and is joined together with the outer lateral reinforcements 520, 530 to the bottom panel 301 of the lower case 300 by welding.

The outer side longitudinal reinforcement 640 is arranged so as to overlap the end of the outer lateral reinforcement 540 . The outer side vertical reinforcement 640 sandwiches the end of the outer lateral reinforcement 540 with the bottom panel 301 of the lower case 300 and is welded together with the outer lateral reinforcement 540 to the bottom panel 301 of the lower case 300 . The outer side vertical reinforcement 640 has a cross-shaped shape in which the length in the width direction of the lower case 300 is longer than the length in the front-rear direction in plan view. A front end in the short direction of the outer side vertical reinforcement 640 is joined to a rear end of the outer side vertical reinforcement 630 by welding. One end in the longitudinal direction of the outer side vertical reinforcement 640 protrudes to the outside in the width direction of the lower case 300 .

The outer side longitudinal reinforcement 650 is arranged so as to overlap the end of the outer lateral reinforcement 550 . The outer side longitudinal reinforcement 650 sandwiches the end portion of the outer lateral reinforcement 550 with the bottom panel 301 of the lower case 300 and is welded together with the outer lateral reinforcement 550 to the bottom panel 301 of the lower case 300 . The front end of the outer side vertical reinforcement 650 is welded to the rear end of the outer side vertical reinforcement 640 . An extension plate 655 extending outward in the width direction of the lower case 300 is joined to the outer side vertical reinforcement 650 . However, the extension plate 655 may be formed integrally with the outer side longitudinal reinforcement 650 .

The outer corner reinforcement 660 is a curved reinforcing member, and connects the outer side longitudinal reinforcement 650 and the outer lateral reinforcement 560 by drawing a curve. The outer corner reinforcement 660 is welded to the bottom panel 301 of the lower case 300 . The front end of the outer corner reinforcement 660 is welded to the rear end of the outer side vertical reinforcement 650 . The rear end of the outer corner reinforcement 660 is welded to one end of the outer lateral reinforcement 560 .

An outer rear end bracket 570 is provided at the rear end of the bottom panel 301 of the lower case 300 . Outer rear end bracket 570 is a member for attaching case fixing rear arm 460 to lower case 300 . The outer rear end bracket 570 sandwiches the outer lateral reinforcement 560 with the bottom panel 301 of the lower case 300 and is joined together with the outer lateral reinforcement 560 to the bottom panel 301 of the lower case 300 by, for example, welding. A part of the outer rear end bracket 570 overlaps the rear end of the outer central longitudinal reinforcement 620 and is sandwiched between the outer central longitudinal reinforcement 620 and the outer lateral reinforcement 560 . A portion where the outer rear end bracket 570, the outer central longitudinal reinforcement 620, and the outer lateral reinforcement 560 are triple overlapped is joined by welding, for example.

FIG. 8 is a perspective view from diagonally upper left front showing the structure of case fixing side arms 410, 420, 430, 440 and their surroundings. Case fixing side arms 410, 420, 430, and 440 are members for suspending battery pack 200 under the floor of the vehicle body. Each of the case fixing side arms 410, 420, 430, 440 is composed of two upper and lower members.

The case fixing side arm 410 and the case fixing side arm 420 have substantially the same shape. The case fixing side arms 410 and 420 include extension plates 412 and 422 extending outward in the width direction of the lower case 300 and having a W-shaped cross section, and a flat cover plate 411 attached on the extension plates 412 and 422. , 421.

The central peaks of the extension plates 412 and 422 are flat and serve as a pedestal on which the cylindrical collar 402 is placed. Lid plates 411 and 421 have holes through which collars 402 pass. The pedestals of the extension plates 412 and 422 are provided with bolt holes and suspension bolts 400 are attached thereto. A hanger bolt 400 projects upwardly through the collar 402 from below the pedestal of the extension plates 412,422.

The case-fixing side arm 430 includes an extension plate 432 extending outward in the width direction of the lower case 300 and having a W-shaped cross section, and a flat cover plate 431 attached on the extension plate 432 . . The extension plate 432 is provided on an extension line of the outer lateral reinforcement 530, and since four outer lateral reinforcements 530 are provided, four case fixing side arms 430 are provided on each side.

The cross-sectional shape of extension plate 432 is slightly different from the cross-sectional shape of extension plates 412 and 422 . The central peak of the extension plate 432, which serves as a base for the collar 402, is lower than both sides. Therefore, when the collar 402 is placed on the pedestal of the extension plate 432 , the collar 402 is slightly sunk under the cover plate 431 .

The case-fixing side arm 440 is affixed to a portion of the outer side longitudinal reinforcement 640 protruding to the outside in the width direction of the lower case 300 and on the outer side longitudinal reinforcement 640, and has a hat-shaped cross section that opens downward. It is composed of a lid plate 441 having a shape. A portion of the outer side vertical reinforcement 640 forming the case fixing side arm 440 has a W-shaped cross-sectional shape that opens upward.

The W-shaped central peak of the outer side longitudinal reinforcement 640 is flat and serves as a base on which the cylindrical collar 406 is placed. Lid plate 441 has a hole through which collar 406 passes. The collar 406 used here is longer than the collar 402 used elsewhere. Therefore, the hanger bolts 404 used here are longer than the hanger bolts 400 used elsewhere.

2-3. Structure of Middle Frame Next, the structure of the middle frame will be described with reference to FIGS. 9 and 10. FIG.

FIG. 9 is a perspective view of the middle frame 385 and its supporting structure from the upper left front. Middle frame 385 includes second floor 360 and center plate 370 . The second floor 360 is surrounded by four frames 362,363. Second floor vertical frames 362 are arranged on the left and right sides of battery pack 200 in the width direction. Second floor horizontal frames 363 are arranged on the front and rear sides of battery pack 200 in the front-rear direction.

Two second floor center frames 364 are arranged at regular intervals between the two front and rear second floor horizontal frames 363 . Both ends of each second floor center frame 364 are connected to the left and right second floor vertical frames 362 . Thereby, the second floor 360 is partitioned into three rectangular areas. A second floor panel 361 is stretched over each rectangular area.

Center plate 370 is positioned in the center of battery pack 200 in the width direction and extends from second floor 360 toward the front of battery pack 200 . The center plate 370 and the second floor 360 are joined by fasteners, for example. The center plate 370 has a hat-shaped cross section.

Center plate 370 and second floor 360 are supported by a plurality of support legs 390 and 391 fixed to partition bracket 340 . Partition brackets 340 are members that partition battery stacks 900 arranged on bottom panel 301 of lower case 300 , and are arranged at regular intervals in the front-rear direction of battery pack 200 . One or two support legs 390 are welded near the center of each partition bracket 340 . The support leg 390 is a member having a Z-shape when viewed from the side, and has a hat-shaped cross section that opens toward the rear. These support legs 390 are arranged in two rows in the front-rear direction of battery pack 200 . Center plate 370 is supported by support legs 390 extending upward from each partition bracket 340 .

Support legs 391 are welded to both ends of the sixth and ninth (last rearmost) partition brackets 340 in the front-rear direction of the battery pack 200 . The support leg 391 is a member having a Z-shape when viewed from the side, and has a hat-shaped cross section that opens toward the rear. However, support leg 391 is wider than support leg 390 . A support leg 391 extending from the sixth partition bracket 340 from the front is joined to the second floor horizontal frame 363 on the front side. A support leg 391 extending from the ninth partition bracket 340 from the front is joined to the second floor horizontal frame 363 on the rear side. As a result, the second floor 360 is indirectly supported by the support legs 390 that support the center plate 370, and its four corners are directly supported by a total of four support legs 391.

Further, the second floor 360 is supported by support walls 392 on both sides in the width direction. The support wall 392 is a wall-shaped member that extends in the front-back direction and the up-down direction of the battery pack 200, and is joined to the second floor vertical frame 362 by fasteners, for example. That is, the second floor 360 is supported by many pillars and two walls.

A partition bracket 366 is fastened to each second floor lateral frame 363 and each second floor central frame 364 with fasteners. The partition bracket 366 has the same shape as the partition bracket 340 provided on the first floor, and has a role of partitioning the battery stacks 900 similarly to the partition bracket 340 .

Support legs 394 are joined by welding, for example, to the first to third partition brackets 366 from the front in the front-rear direction of battery pack 200 . The support leg 394 is a member having a Z-shape when viewed from the side, and has a hat-shaped cross section that opens toward the rear. A support leg 394 is provided near the center of each divider bracket 366 . A total of three support legs 394 support center beam 380 extending in the front-rear direction of battery pack 200 .

Support legs 395 are joined to the first and second partition brackets 366 from the front in the front-rear direction of the battery pack 200 by, for example, welding. The support leg 395 is a member having a Z-shape when viewed from the side, and has a hat-shaped cross section that opens toward the rear. However, support leg 395 is wider than support leg 394 . Support legs 395 are provided at both ends of each partition bracket 366 . A pair of left support legs 395 and a pair of right support legs 395 support side beams 381 extending in the front-rear direction of battery pack 200 .

Center beam 380 and side beam 381 are members that support battery ECUs 950 and 951 (see FIG. 3). Battery ECU 950 is supported by center beam 380 and right side beam 381 , and battery ECU 951 is supported by center beam 380 and left side beam 381 . The structure and function of the battery ECUs 950 and 951 are not limited.

FIG. 10 is a perspective view of lower case 300 when middle frame 385 is attached to lower case 300 and lower case 300 is cut along the longitudinal center line of battery pack 200 and viewed diagonally from the upper left front. . Support legs 390 and 391 that support second floor 360 and center plate 370 are fixed to inner lateral reinforcements 320 and 330 via partition brackets 340 . Also, a support wall 392 that supports the second floor 360 is fixed to the fixed base 350 .

The inner lateral reinforcements 320 and 330 and the fixed base 350 are welded to the bottom panel 301 of the lower case 300 . Therefore, by fixing the support legs 390 and 391 to the inner and lateral reinforcements 320 and 330 and fixing the support wall 392 to the fixed base 350, the second floor 360 and the center plate 370 are fixed to the bottom panel 301 of the lower case 300. fixed against.

2-4. Details of Support Structure of Middle Frame Details of the support structure of the middle frame 385 will be described with reference to FIGS. 11 to 13 . However, here, the support structure of the center plate 370, more specifically, the support structure by the support legs 390 will be described in detail as a representative of the middle frame 385. FIG.

FIG. 11 is a perspective view of the lower case 300 when the middle frame 385 is attached to the lower case 300 and viewed from the upper left front in an enlarged manner. The center plate 370 is a member having a hat-shaped cross section, and has a flange 371 with a flat surface and a concave portion 372 that is one step lower. A support leg 390 is fastened to the flange 371 of the center plate 370 by fasteners 374 . Support leg 390 is welded to partition bracket 340 . The partition bracket 340 is fastened to the inner lateral reinforcement 320 with fasteners 344 .

FIG. 12 shows the front of lower case 300 when middle frame 385 is attached to lower case 300 and lower case 300 is cut along the center line in the front-rear direction of battery pack 200 and enlarged from the upper left front. 1 is a perspective view of a part; FIG. FIG. 12 shows an enlarged view of the partition bracket 340 to which the support leg 390 is fixed.

The partition bracket 340 has a base portion 341 , a partition wall 342 and a cell case fixing portion 343 . The base portion 341 is a portion that is fastened to the inner lateral reinforcement 320 via fasteners 344 . The base portion 341 is provided at a plurality of locations (seven locations) on the partition bracket 340 .

The partition wall 342 is provided perpendicular to the base portion 341 and partitions the battery stacks 900 . Partition wall 342 is provided on the rear side of battery pack 200 in the front-rear direction with respect to base portion 341 . The partition wall 342 also has a role of supporting the back surface of the support leg 390 . Note that the height of the partition wall 342 is not uniform in the width direction of the battery stack 900 .

The cell case fixing portion 343 is a mountain portion formed between the base portions 341 and 341 . The cell case fixing portion 343 , which will be described later, has a role of fixing claw portions formed on the cell case 920 of the battery stack 900 . A support leg 390 is welded onto a portion of the cell case fixing portion 343 .

Note that the X marks drawn in FIG. 12 indicate welding points 801 and 802 . A plurality of welding margins 321 are formed at substantially regular intervals on both sides of the inner lateral reinforcement 320 in the short direction. A white X mark positioned above the welding margin 321 indicates a welding point 801 for welding the inner lateral reinforcement 320 . Although it will be described in detail later, at a welding point 801 indicated by a white X mark, a welding margin 321 of the inner lateral reinforcement 320, the bottom panel 301 of the lower case 300, and the outer lateral reinforcement 530 are welded together. be.

A welding point 802 indicated by a black X mark is provided at a position where the outer lateral reinforcement 530 and the outer central longitudinal reinforcement 610 intersect in plan view. The vicinity of the welding point 802 of the inner lateral reinforcement 320 is gouged so as not to interfere with the welding point 802 . Although it will be described later in detail, the bottom panel 301 of the lower case 300, the outer lateral reinforcement 530, and the outer central longitudinal reinforcement 610 are welded together at the weld points 802 indicated by the black X marks.

FIG. 13 is an enlarged view of lower case 300 cut along the longitudinal center line of battery pack 200 with middle frame 385 and battery stack 900 attached to lower case 300 and viewed obliquely from the upper left front. 4 is a perspective view of the front portion of the lower case 300. FIG. Two adjacent battery stacks 900 are separated by a partition bracket 340 . A support leg 390 fixed to the partition bracket 340 extends upward through between the cell stacks 900 .

When middle frame 385 and battery stack 900 are attached to lower case 300 , center plate 370 passes over battery stack 900 . In other words, the plurality of battery stacks 900 are arranged directly below the center plate 370 so as to be orthogonal to the center plate 370 . Center plate 370 is supported by support legs 390 projecting from between battery stacks 900 . A heater 930 is provided between the battery stack 900 and the bottom panel 301 in FIG. This will be discussed later.

2-5. Details of Joint Structure Between Reinforcing Members Next, details of a joint structure between reinforcing members such as reinforcements and brackets will be described with reference to FIGS. 14 to 16 .

FIG. 14 shows the front portion of lower case 300 when middle frame 385 is attached to lower case 300 and lower case 300 is cut along the center line in the front-rear direction of battery pack 200 and enlarged when viewed obliquely from the lower left. is a perspective view of the. FIG. 14 shows the joint structure between the outer central longitudinal reinforcement 610 and the outer lateral reinforcements 510, 520, 530, and the joint structure between the outer side longitudinal reinforcement 630 and the outer lateral reinforcements 520, 530. there is

The outer central longitudinal reinforcement 610 can be divided into a strut portion 611 and a pressing portion 614 according to its role. Similarly, the outer side vertical reinforcement 630 can also be divided into a strut portion 631 and a pressing portion 634 according to its role. Although the explanation is omitted, the outer center vertical reinforcement 620 and the outer side vertical reinforcements 640, 650 can also be divided into a strut portion and a pressing portion according to their roles.

The pressing portions 614 and 634 have the role of pressing the outer lateral reinforcement against the bottom panel 301 of the lower case 300 . In the example shown in FIG. 14 , the outer central longitudinal reinforcement 610 presses down the outer lateral reinforcements 510 , 520 , 530 with the pressing portion 614 . The outer side vertical reinforcement 630 presses the outer lateral reinforcements 520 and 530 with a pressing portion 634 . The pressing portions 614 and 634 are formed so as to be in close contact with the surface of the outer lateral reinforcement. Also, the pressing portions 614 and 634 are joined to the surface of the outer lateral reinforcement by welding, adhesive, or the like.

The strut portions 611 and 631 serve as struts between adjacent outer lateral reinforcements. In the example shown in FIG. 14, the strut portion 611 of the outer central longitudinal reinforcement 610 is between the outer lateral reinforcement 510 and the outer lateral reinforcement 520, between the outer lateral reinforcement 520 and the outer lateral reinforcement 530, and , between the outer lateral reinforcement 530 and the outer lateral reinforcement 530. The strut part 631 of the outer side vertical reinforcement 630 functions as a strut between the outer lateral reinforcement 520 and the outer lateral reinforcement 530 and between the outer lateral reinforcement 530 and the outer lateral reinforcement 530. .

The strut portions 611 and 631 have hat-shaped cross-sectional shapes that are open upward. Both ends of the strut portions 611 and 631 in the front-rear direction are formed so that the width increases as they approach the lateral reinforcement, and the ridgelines 613 and 633 of the strut portions 611 and 631 are continuously connected to the ridgelines of the lateral lateral reinforcement. ing.

For example, focusing on the strut portion 611 of the outer central longitudinal reinforcement 610, the ridgeline 613 of the strut portion 611 is continuously connected to the ridgeline 511 of the outer lateral reinforcement 510 at the portion contacting the outer lateral reinforcement 510. . Moreover, the ridgeline 613 of the strut portion 611 is continuously connected to the ridgeline 531 of the outer lateral reinforcement 530 at the portion that abuts on the outer lateral reinforcement 530 . Focusing on the strut portion 631 of the outer side vertical reinforcement 630 , the ridgeline 633 of the strut portion 631 is continuously connected to the ridgeline 531 of the outer lateral reinforcement 530 at the portion that contacts the outer lateral reinforcement 530 . Although the description is omitted, the portions of the struts 611 and 631 that contact the other outer lateral reinforcement are also formed in the same manner.

Welding margins 615 and 635 are formed at both end portions of the strut portions 611 and 631, respectively. For example, the bottom panel 301, the outer lateral reinforcement 530, and the outer central longitudinal reinforcement 610 are welded together at the welding allowance 615 that contacts the outer lateral reinforcement 530 (specifically, its flange portion). In addition, the bottom panel 301, the outer lateral reinforcement 520, and the outer side vertical reinforcement 630 are welded together at the welding margin 635 in contact with the outer lateral reinforcement 520 (specifically, its flange portion). Although the description is omitted, the welding margins 615 and 635 that contact other outer lateral reinforcements are also welded together with the bottom panel 301 across the outer lateral reinforcements.

FIG. 15 is an enlarged schematic cross-sectional view of the joint between the bottom panel 301 of the lower case 300 and the inner lateral reinforcement 320 and the outer lateral reinforcement 530 . Again, the support leg 390 is welded to the partition bracket 340 . The partition bracket 340 is fastened to the inner lateral reinforcement 320 with fasteners 344 .

The inner lateral reinforcement 320 sandwiches the bottom panel 301 with the outer lateral reinforcement 530 . The inner lateral reinforcement 320 is welded at its welding margin 321 . Welding points 801 where welding is performed include the welding allowance 321 of the inner lateral reinforcement 320 , the bottom panel 301 , and the outer lateral reinforcement 530 . These three plate members are joined by welding. In addition, the outer lateral reinforcement 530 is processed in more detail so that the valley lines (when viewed from the outside) substantially overlap in the vertical direction so as to overlap with the reinforcing recess 302a formed in the bottom panel 301. .

Welding by a similar method is also performed for other inner lateral reinforcements and other outer lateral reinforcements. For example, the inner lateral reinforcement 320 and the outer lateral reinforcement 520 are welded across the bottom panel 301 .

FIG. 16 is a cross-sectional view schematically showing an enlarged joint between the bottom panel 301 of the lower case 300, the outer lateral reinforcement 530, and the outer central longitudinal reinforcement 610. As shown in FIG. The outer central longitudinal reinforcement 610 sandwiches the outer lateral reinforcement 530 with the bottom panel 301 . The outer central longitudinal reinforcement 610 is welded at its weld allowance 615 . Welding points 802 where welding is performed include the weld allowance 615 of the outer central longitudinal reinforcement 610 , the outer lateral reinforcement 530 , and the bottom panel 301 . These three plate members are joined by welding. Note that the welding margin 615 of the outer central longitudinal reinforcement 610 is processed so that its valley line (when viewed from the outside) substantially overlaps the valley line of the outer lateral reinforcement 530 in the vertical direction.

Welding by a similar method is also performed for other outer longitudinal reinforcements and other outer lateral reinforcements. For example, the outer central longitudinal reinforcement 620 and the outer lateral reinforcement 540 are welded together with the bottom panel 301 .

2-6. Details of Frame Structure of Second Floor Details of the frame structure of the second floor 360 will be described with reference to FIGS. 17 to 19 .

17 is a plan view schematically showing the engagement relationship between the center plate 370 and the frame of the second floor 360. FIG. The outer frame of the second floor 360 is formed by the pair of second floor vertical frames 362 and the pair of second floor horizontal frames 363 . Two second floor center frames 364 are arranged in parallel with the second floor lateral frames 363 in the outer frame. These frames 362, 363, 364 are all made of hollow aluminum squares and are joined together by fasteners, for example.

A second floor 360 rests on the center plate 370 . Specifically, the second floor lateral frame 363 and the second floor central frame 364 are perpendicular to the center plate 370 and are mounted on the center plate 370 . The center plate 370 passes through the center of the second floor 360 and extends to the second floor horizontal frame 363 on the far side.

FIG. 18 is a longitudinal sectional view schematically showing the engagement relationship between the center plate 370, the support legs 390, and the frame of the second floor 360. FIG. A region of the center plate 370 on which the second floor 360 is placed is supported by a support leg 390 having a Z shape in side view. A second floor lateral frame 363 and a second floor central frame 364 are arranged at a portion supported by the support legs 390 of the center plate 370 .

A second floor panel 361 is provided in each of three areas defined by the second floor lateral frame 363 and the second floor central frame 364 . A flange 363a for mounting the second floor panel 361 is formed on the side of the second floor horizontal frame 363 on which the second floor panel 361 is arranged. Both sides of the second floor center frame 364 are also provided with flanges 364a for mounting the second floor panel 361 thereon.

FIG. 19 is a horizontal cross-sectional view schematically showing the structure of the second floor 360. As shown in FIG. As shown in FIG. 19, a flange 362a is formed on the side of the second floor vertical frame 362 on which the second floor panel 361 is arranged. This flange 362 a is located above the second floor panel 361 . The second floor panel 361 is sandwiched and fixed between the flange 362a of the second floor vertical frame 362 and the flanges 363a and 364a of the second floor horizontal frame 363 and the second floor central frame 364 .

2-7. Details of Rear End of Lower Case Details of the end of the lower case 300 will be described with reference to FIGS. 20 to 25. FIG.

FIG. 20 shows the rear portion of lower case 300 when middle frame 385 is attached to lower case 300 and lower case 300 is cut along the longitudinal center line of battery pack 200 and enlarged from the upper left rear. is a perspective view of the. An outer center vertical reinforcement 620 extends along the center line on the rear outer side of the bottom panel 301 of the lower case 300 .

The outer central longitudinal reinforcement 620 overlaps with the outer lateral reinforcement 560 arranged at the rear end portion of the bottom panel 301 and extending in the width direction. Outer rear end brackets 570 to which case-fixing rear arms 460 are attached are arranged further rearwardly and outwardly of the outer lateral reinforcement 560 . The outer central longitudinal reinforcement 620 also overlaps the outer rear end bracket 570 .

Outer rear end bracket 570 protrudes rearward from the rear end portion of lower case 300 . A case rear surface 305 at the rear end of the lower case 300 stands substantially vertically, and a bracket rear surface 571 to which the case fixing rear arm 460 of the outer rear end bracket 570 is attached also stands substantially vertically. Between the rear end portion of the lower case 300 and the outer rear end bracket 570, a rear end inner bracket 580 having a Z-shaped cross-sectional shape in a side view is arranged. The inner rear end bracket 580 is joined to the case rear surface 305 and the bracket rear surface 571 so as to connect the lower case 300 and the outer rear end bracket 570 .

FIG. 21 is a side view of the rear portion of lower case 300 when middle frame 385 is attached to lower case 300 and lower case 300 is cut along the longitudinal centerline of battery pack 200 and enlarged from the left side. It is a diagram. The case fixing rear arm 460 is joined to the outer rear end bracket 570 together with the rear end inner bracket 580 by fasteners (bolts and nuts) 471 passing through the outer rear end bracket 570 and the rear end inner bracket 580 .

The outer rear end bracket 570 to which the case fixing rear arm 460 is attached forms a closed cross section together with the outer lateral reinforcement 560 , the rear end inner bracket 580 and the lower case 300 . The outer rear end bracket 570 and the rear end inner bracket 580 are joined by the fastener 471 as described above. Note that when the rear end inner bracket 580 is cut along a plane perpendicular to the center line, the cross-sectional shape near the central portion is a hat shape that opens downward.

Lower case 300 and outer rear end bracket 570 are joined by welding at welding points 803 on case rear surface 305 . A plurality of welding points 803 are provided. The outer lateral reinforcement 560 (specifically, its flange portion) and the lower case 300 (specifically, its bottom panel 301) are joined by welding at a welding point 804 that also overlaps with the inner lateral reinforcement 330 (specifically, its flange portion). It is A plurality of welding points 804 are provided.

The outer rear end bracket 570 and the outer lateral reinforcement 560 are welded together with the outer central longitudinal reinforcement 620 . A welding point 805 is a portion where these three plate members are overlapped. One or more welding points 805 are provided. The outer central longitudinal reinforcement 620 and the outer lateral reinforcement 560 are joined by welding at a welding point 802 that also overlaps the bottom panel 301 .

21 shows a pin 351 located between two support legs 390 adjacent in the front-rear direction of battery pack 200 and protruding from fixed base 350. As shown in FIG. This pin 351 is used for positioning the battery stack 900 . Specifically, a stack support bracket 912 (see FIG. 4) that restricts movement of the battery stack 900 in the longitudinal direction is attached to the pin 351 .

FIG. 22 shows the rear portion of lower case 300 when middle frame 385 is attached to lower case 300 and lower case 300 is cut along the center line in the front-rear direction of battery pack 200 and enlarged from the lower left. It is a perspective view. An outer corner reinforcement 660 is joined to the end of the outer lateral reinforcement 560 to which the outer rear end bracket 570 is joined.

Outer corner reinforcement 660 connects outer lateral reinforcement 560 extending in the width direction of battery pack 200 and outer side vertical reinforcement 650 extending in the front-rear direction of battery pack 200 . The outer corner reinforcement 660 is welded to the bottom panel 301 together with the outer lateral reinforcement 560 at a portion overlapping the outer lateral reinforcement 560 . Also, the outer corner reinforcement 660 is welded to the bottom panel 301 together with the outer side vertical reinforcement 650 at a portion overlapping the outer side vertical reinforcement 650 .

FIG. 23 is a perspective view showing the structure of the outer rear end portion of lower case 300 to which case fixing rear arm 460 is attached. The outer rear end bracket 570 has a bracket rear surface 571 to which the case fixing rear arm 460 is fixed, and a support surface 573 joined to the surface of the outer lateral reinforcement 560 and substantially perpendicular to the bracket rear surface 571 . The support surface 573 has a trapezoidal shape that gradually expands from the bracket rear surface 571 side toward the side joined to the outer lateral reinforcement 560 .

The case fixing rear arm 460 has a bracket side surface 572 in addition to the bracket rear surface 571 and the support surface 573 . The bracket side surface 572 stands substantially perpendicular to the support surface 573 , intersects the bracket rear surface 571 substantially perpendicularly, and is continuously connected to the rear surface 562 of the outer lateral reinforcement 560 .

FIG. 24 is a perspective view of the bottom surface of the right rear portion of the lower case 300 when viewed in an enlarged manner from the lower left. FIG. 24 shows the connection state between the outer corner reinforcement 660 and the outer lateral reinforcement 560 and the connection state between the outer corner reinforcement 660 and the outer side longitudinal reinforcement 650 on the inner side of the corner of the outer corner reinforcement 660. depicted in detail.

The inner valley line 665a of the outer corner reinforcement 660 is connected substantially continuously to the inner valley line 561a of the outer lateral reinforcement 560 at the inner corner top 661a, and the inner valley line 661a of the outer side longitudinal reinforcement 650 at the inner corner top 661b. It is connected substantially continuously to the valley line 651a. In addition, the inner ridgeline 665b of the outer corner reinforcement 660 is connected substantially continuously to the inner ridgeline 561b of the outer lateral reinforcement 560 at the inner corner bottom 662a, and the inner side longitudinal reinforcement 650 is connected at the inner corner bottom 662b. It is connected substantially continuously to the edge line 651b.

FIG. 25 is a perspective view of the bottom surface of the left rear portion of the lower case 300 when viewed in an enlarged manner from the left obliquely lower rear portion. FIG. 25 shows the connection state between the outer corner reinforcement 660 and the outer lateral reinforcement 560 and the connection state between the outer corner reinforcement 660 and the outer side longitudinal reinforcement 650 on the outside of the corner of the outer corner reinforcement 660. depicted in detail.

The outer valley line 665c of the outer corner reinforcement 660 is connected substantially continuously to the outer valley line 561c of the outer lateral reinforcement 560 at the outer corner top 663a. It is connected substantially continuously to the valley line 651c. Further, the outer ridgeline 665d of the outer corner reinforcement 660 is connected substantially continuously to the outer ridgeline 561d of the outer lateral reinforcement 560 at the outer corner bottom 664a, and the outer side vertical reinforcement 650 is connected at the outer corner bottom 664b. It is connected substantially continuously to the ridgeline 651d.

2-8. Heating/Cooling Device Next, the heating/cooling device provided in the battery pack 200 will be described with reference to FIGS. 26 to 29. FIG.

FIG. 26 is a perspective view of the lower case 300 with the middle frame 385 and the heating/cooling device attached and viewed obliquely from the upper left front. Battery pack 200 incorporates a heating/cooling device to keep battery stack 900 within a proper operating temperature range. However, heating and cooling are performed by separate devices. Here, an overview of the cooling device will be described with reference to FIG.

A blower 700 is arranged along with a junction box 760 at the tip of the lower case 300 . A pair of blowers 700 are arranged on the left and right sides of junction box 760 on the front side inside battery pack 200 (on lower case 300). The air blown out from the blower 700 is cooled by a pair of left and right heat exchangers (not shown) with a refrigerant supplied from the outside. 706 into the battery pack 200 . In the heat exchanger, air does not flow in and out of the outside, and the blower 700 draws in the air inside the battery pack 200 and blows it. That is, the cooling device is configured as an internal air circulation device that circulates the air inside battery pack 200 .

The air ducts are laid along the left and right side edges of lower case 300 . Specifically, along the left side edge of lower case 300 , a left air duct 704 extending in the front-rear direction from blower 700 toward the rear of lower case 300 is laid. The left fan duct 704 branches off midway and heads toward the second floor 360 to form a second floor left fan duct 705 that sends air to the second floor 360 . A right air duct 702 is laid along the right side edge of lower case 300 to extend from blower 700 toward the rear of lower case 300 in the front-rear direction. The right air duct 702 also branches off midway toward the second floor 360 to form a second floor right air duct 706 that sends air to the second floor 360 (only a portion of the second floor right air duct 706 is depicted in FIG. 26). are listed). That is, air ducts 702 , 704 , 705 , and 706 are arranged along the front-rear direction of battery pack 200 on the outside of battery stacks 900 in the width direction.

Although it will be described in detail later, baffle plates 712 and 722 are provided in the lower case 300 at regular intervals in the front-rear direction. This means that the baffle plates 712 and 722 are installed in the gaps between the battery stacks 900 and 900 . The baffle plates 712 and 722 are also provided on the second floor 360, although not shown. The air blown out from blower 700 is sent to battery stack 900 through air guide plates 712 and 722 .

There are two types of baffle plates 712 and 722 . The first air guide plate 712 is arranged behind the odd-numbered battery stacks 900 from the front, and is connected to the air distribution section 711 provided in the right air duct 702 . The air distribution portion 711 is provided for each air guide plate 712 . The second air guide plate 722 is arranged behind the even-numbered cell stacks 900 from the front, and is connected to the air distribution section 721 provided in the left air duct 704 . The air distribution portion 721 is provided for each air guide plate 722 . The air distribution portions 711 and 721 are also provided on the second floor 360 together with the air guide plates 712 and 722 (the air distribution portion 722 on the second floor 360 is not shown in FIG. 26). The air distribution part 711 is mainly provided to guide the air to the odd-numbered battery stacks 900 from the front, and the air distribution part 721 is mainly provided to guide the air to the even-numbered battery stacks 900 from the front. there is The position where the air distribution section is provided, that is, the battery stack 900 to which air is blown by the left and right air ducts 702 and 704 may be reversed.

27 to 29 are diagrams showing lower case 300 cut along the longitudinal centerline of battery pack 200 with middle frame 385 and heating/cooling device attached to lower case 300, and each of them is a line of sight. It is shown in a different direction. FIG. 27 is an enlarged perspective view of the front portion of the lower case 300 as seen obliquely from the upper left rear. FIG. 28 is a perspective view of the front portion of the lower case 300 when viewed obliquely from the upper left in an enlarged manner. FIG. 29 is a side view of the front portion of the lower case 300 as seen from the left side in a greatly enlarged manner.

As shown in these figures, baffle plates 712 and 722 are attached to partition bracket 340 along with support leg 390 . Particularly, as shown in FIG. 29, brackets 713 and 723 are erected on the partition bracket 340, and the baffle plates 712 and 722 are supported by the brackets 713 and 723. As shown in FIG. Brackets 713 and 723 are joined to partition bracket 340 by welding, for example. The height of the baffle plates 712 and 722 is equal to or less than the height of the support leg 390, and interference with the center plate 370 arranged above the baffle plates 712 and 722 does not occur.

The baffle plates 712 and 722 have a hat-shaped cross-sectional shape with the open side of the battery stack 900 to be blown air. FIG. 62 is a supplemental view of FIG. 28, and is a schematic plan view of the baffle plates 712 and 722 cut parallel to the bottom surface of the lower case 300 and viewed from above. As shown in FIG. 62, the rear walls 715 and 725 of the air guide plates 712 and 722 are inclined from the side of the air distribution portions 711 and 721 toward the opposite side so that the distance to the rear surface of the battery stack 900 becomes closer. is doing. In other words, the baffle plates 712 and 722 have a triangular shape in plan view, with the width being widest at the outlet of the air distribution portions 711 and 721 and the width gradually narrowing toward the end. Packings 714 and 724 are provided between the edges of the baffle plates 712 and 722 and the battery stack 900 to prevent air leakage.

Due to the above structure, the channel cross-sectional area of the baffle plate 712 gradually decreases with increasing distance from the air distribution portion 711 . In addition, the channel cross-sectional area of the baffle plate 722 also gradually decreases as the distance from the air distribution portion 721 (see FIG. 26) increases. 27 to 29 illustrate a structure for distributing air from the air distribution portion 711 provided in the right fan duct 702 to the air guide plate 712, but from the air distribution portion 721 provided in the left fan duct 704 The structure for distributing air to the baffle plate 722 is similar to this.

Heating of the battery stack 900 is performed by an electric heater 930 . Heater 930 rests on bottom panel 301 between partition brackets 340 . That is, heater 930 is provided for each battery stack 900 . When the battery stack 900 is mounted in the lower case 300, the heater 930 is sandwiched between the battery stack 900 and the bottom panel 301, as depicted in FIG. 13, for example. Heater 930 has approximately the same length as battery stack 900 . However, the heater 930 may be a set of multiple heaters arranged in the longitudinal direction of the battery stack 900 .

2-9. Cable Laying Structure Next, a cable laying structure will be described with reference to FIGS. 30 and 31. FIG. A plurality of cables 751 including power lines and signal lines are drawn inside the battery pack 200 .

FIG. 30 is a perspective view of the front portion of lower case 300 when battery stack 900, middle frame 385, cables, and heating/cooling device are attached to lower case 300 and viewed diagonally from the upper left front. A center plate 370 extending in the longitudinal direction of lower case 300 is provided above battery stacks 900 arranged in lower case 300 .

The cables 751 pulled in the battery pack 200 include cables connected to each battery stack 900, cables connected to the junction box 760 and the blower 700 installed at the tip of the lower case 300, and cables connected to the battery ECUs 950 and 951. etc. are included. These cables 751 are put together and passed over the center plate 370 . That is, the center plate 370 is used as a passage for the cable 751 to pass through.

At least part of cable 751 is connected to service plug 750 provided on center plate 370 . When upper case 210 is attached to lower case 300 , service plug 750 protrudes from upper case 210 . Then, when battery pack 200 is mounted in a vehicle, service plug 750 is connected to a connector on the vehicle side.

FIG. 31 is a perspective view of the periphery of center plate 370 when battery pack 200 is cut in the width direction and enlarged from the front diagonally above. The center plate 370 has flanges 371 on the left and right. A support leg 390 is fastened to the flange 371 via a shim plate 375 with fasteners 374 . A closed cross section is formed between the flange 371 around the fastener 374 and the shim plate 375 .

Between the flanges 371 on the left and right sides of the flange 371 , there is a recessed portion 372 that is one step lower than the flanges 371 . When upper case 210 is attached to lower case 300 , a space is formed between upper case 210 and recessed portion 372 . A cable 751 is passed through the space.

2-10. Fixing Structure of Battery Stack The fixing structure of the battery stack 900 will be described with reference to FIGS. 32 and 33. FIG.

FIG. 32 shows a greatly enlarged left side view of lower case 300 cut along the longitudinal centerline of battery pack 200 with middle frame 385, heating/cooling device, and battery stack 900 attached to lower case 300. FIG. It is a side view of the front part of the lower case 300 seen. Battery stack 900 has cell case 920 that accommodates cell 901 . A claw portion 922 extending toward the partition bracket 340 is formed on the bottom portion of the cell case 920 .

The claw portion 922 enters the space sandwiched between the partition bracket 340 and the inner lateral reinforcement 320 . The upward movement of the cell case 920 is restricted by the left and right claws 922 entering under the partition bracket 340 . The engagement state between the pawl portion 922 and the partition bracket 340 is illustrated in detail in FIG.

FIG. 33 is an enlarged view from the left side of the lower case cut along the longitudinal center line of the battery pack 200 with the middle frame 385, the battery stack 900, and the heating/cooling device attached to the lower case 300. FIG. 14 is a side view of the periphery of the partition bracket 340 in the case of FIG. The partition bracket 340 is joined to the inner lateral reinforcement 320 by fasteners 344 .

The partition bracket 340 has a cell case fixing portion 343 . A bracket 723 that supports the support leg 390 and the baffle plate 722 is joined to the cell case fixing portion 343 . Cell case fixing portions 343 are formed on both left and right sides of partition bracket 340 , that is, on the front side and the rear side in the front-rear direction of battery pack 200 . The cell case fixing portion 343 forms a gap with the inner lateral reinforcement 320 .

The partition brackets 340 are provided on both sides of each battery stack 900 in the short direction. Claw portions 922 are also formed on both left and right sides of cell case 920 , that is, on the front side and the rear side in the front-rear direction of battery pack 200 . Claw portion 922 enters the gap formed by cell case fixing portion 343 and inner lateral reinforcement 320 , thereby restricting vertical and horizontal movement of cell case 920 , and battery stack 900 is fixed to lower case 300 . The manner in which the claw portion 922 is engaged with the cell case fixing portion 343 is also depicted in FIG.

3. Vehicle Body Structure Next, the vehicle body structure of the vehicle according to the embodiment will be described.

3-1. Outline of Vehicle Body Structure First, an outline of the vehicle body structure will be described with reference to FIG.

FIG. 34 is a perspective view from the diagonally lower left rear showing how battery pack 200 according to the embodiment is mounted in vehicle 100 . Battery pack 200 is mounted under the floor of vehicle 100 . Note that the floor in the present disclosure is a term that means the entirety of the floor panel 102 , a frame member that supports the floor panel 102 , and a reinforcing member that reinforces the floor panel 102 , and is not limited to the floor panel 102 .

A pair of underfloor side reinforcements 120 , a pair of rear floor side members 132 , a rear underfloor cross member 130 , and a front underfloor reinforcement 136 are provided under the floor of the vehicle 100 . These are joined to the floor panel 102, for example by welding.

The under-floor side reinforcements 120 are arranged on the right and left sides of the vehicle 100 in the width direction, and extend from the central portion of the vehicle 100 in the front-rear direction to the front side. Rear floor side members 132 are arranged on the right and left sides in the width direction of vehicle 100 and extend in the front-rear direction at the rear portion of vehicle 100 . Rear floor lower cross member 130 is a member that extends in the width direction of vehicle 100 , and both ends of the rear floor lower cross member 130 are joined near the central portions of left and right rear floor lower cross members 130 . The front floor lower reinforcement 136 is a member extending in the width direction of the vehicle 100 , and both ends thereof are joined near the front end portions of the left and right rear floor lower cross members 130 .

As described above, battery pack 200 includes a plurality of suspension bolts 400 and 404 and fasteners 470 . Battery pack 200 is fixed under the floor of vehicle 100 using them. Specifically, the six suspension bolts 400 on the left side of the battery pack 200 are fastened to the left underfloor side reinforcement 120 , and the six suspension bolts 400 on the right side of the battery pack 200 are fastened to the right underfloor side reinforcement 120 . be concluded.

The last suspension bolt 404 is longer than the other suspension bolts 400 . The left hanging bolt 404 is fastened near the portion where the front floor lower reinforcement 136 is joined at the front end of the left rear floor side member 132 . The right hanging bolt 404 is fastened near the front end portion of the right rear floor side member 132 where the front floor lower reinforcement 136 is joined.

Two fasteners 470 are attached to the upper ends of a pair of case fixing rear arms 460 . A total of four fasteners 470 are fastened to the rear floor lower cross member 130 . Battery pack 200 is fixed to vehicle 100 and integrated with vehicle 100 by fastening all suspension bolts 400 and 404 and fasteners 470 to the frame members or reinforcing members of vehicle 100 .

3-2. Body Frame Structure Details of the body frame structure will be described with reference to FIGS. 35 to 38. FIG.

FIG. 35 is a perspective view showing in detail the frame structure under the floor of vehicle 100 according to the embodiment. Under the floor of vehicle 100, a front suspension member 160 is provided in addition to the aforementioned frame members and reinforcing members. A front suspension member 160 is connected to the front end of the under-floor side reinforcement 120 .

The underfloor side reinforcement 120 has a hat-shaped cross-sectional shape with a flange portion and is open upward, and is joined to the floor panel 102 at the flange portion. The under-floor side reinforcement 120 is connected to a rear apartment 120a having a substantially constant distance from the opponent's under-floor side reinforcement 120 and the front side of the rear apartment 120a. and a front part 120b with which the distance to the force 120 is shortened. That is, in the front part 120b, the distance between the pair of under-floor side reinforcements 120 increases from the front toward the rear. The under-floor side reinforcement 120 may be a single member, or may be a plurality of members joined together. In the embodiment, at least the rear part 120a is constructed by connecting a plurality of members. In FIG. 35, illustration of some members that constitute the rear part 120a is omitted.

The rear floor side member 132 has a hat-shaped cross section opening upward. A front end of the rear floor side member 132 is joined to a rear end of the under-floor side reinforcement 120 directly or via another member. The front side of the rear floor side member 132 is curved upward toward the rear. A trailing arm fixing opening 132a for fixing the trailing arm is opened in the curved portion. The rear floor side member 132 may be a single member, or may be a plurality of members joined together.

Rear floor lower cross member 130 has a hat-shaped cross-sectional shape that opens upward. The joining position of the rear floor lower cross member 130 to the rear floor side member 132 is rearward of the position of the trailing arm fixing opening 132a, and the rear tip portion of the rear floor side member 132 extending straight rearward. is. A pair of bulkheads 480 are arranged in the rear floor lower cross member 130 so as to be laterally spaced apart. Bulkhead 480 is arranged at a position where case fixing rear arm 460 in rear floor under cross member 130 is fastened to rear floor under cross member 130 , and is fixed inside rear floor under cross member 130 by welding or the like. Bulkhead 480 , rear floor lower cross member 130 , and case fixing rear arm 460 overlap substantially vertically and are fastened together by fasteners 470 .

The front floor lower reinforcement 136 has an L-shaped cross section in which the long sides stand vertically and the short sides protrude forward. The joining position of the front floor lower reinforcement 136 to the rear floor side member 132 is forward of the position of the trailing arm fixing opening 132a. Front floor under reinforcement 136 and rear floor under cross member 130 are spaced apart by a distance that allows high ceiling portion 212 of upper case 210 of battery pack 200 to be accommodated therebetween.

FIG. 36 is a perspective view showing the frame structure of the rear section of vehicle 100 according to the embodiment. The rear section of vehicle 100 is provided with an annular frame made up of a plurality of frame members 140 , 141 , 142 , 143 .

Frame members that form the annular frame include a rear floor upper cross member 140 , a quarter pillar inner reinforcement 141 , a quarter pillar outer reinforcement 142 , and a roof reinforcement 143 . Roof reinforcement 143 is a member that reinforces the roof of vehicle 100 and extends in the width direction of vehicle 100 . The roof reinforcement 143 has a hat-shaped cross-sectional shape that opens downward toward the inside of the vehicle compartment.

The quarter-pillar inner reinforcement 141 and the quarter-pillar outer reinforcement 142 are members that constitute the rear pillar of the vehicle. The quarter-pillar inner reinforcement 141 has a hat-shaped cross-sectional shape that opens toward the outside of the vehicle compartment. On the other hand, the quarter-pillar outer reinforcement 142 has a hat-shaped cross-sectional shape that opens toward the inside of the vehicle compartment. Each upper end is joined to the end of the roof reinforcement 143 . Note that the quarter pillar inner reinforcement 141 is also depicted in FIG.

The upper side of the quarter-pillar inner reinforcement 141 and the upper side of the quarter-pillar outer reinforcement 142 are joined together. The lower side of the quarter pillar inner reinforcement 141 is joined to a wheelhouse inner panel 145 forming the inside of the wheelhouse. The lower side of the quarter-pillar outer reinforcement 142 is joined to a wheelhouse outer panel 144 that forms the outside of the wheelhouse.

Rear floor upper cross member 140 has a hat-shaped cross-sectional shape that opens downward. Both ends of the rear floor upper cross member 140 are joined to the lower ends of the left and right quarter pillar inner reinforcements 141 . As will be described later, the rear floor upper cross member 140 is joined to the rear floor lower cross member 130 with the floor panel 102 interposed therebetween.

FIG. 37 is a perspective view showing the structure of rear suspension 170 of vehicle 100 according to the embodiment. The rear portion of battery pack 200 reaches rear suspension 170 that supports rear wheel 104 (see FIG. 1). For the position of the rear suspension 170 on the vehicle body 101 (see FIG. 1), refer to the position of the shock absorber fixing portion 179 shown in FIG. The position of the shock absorber fixing portion 179 (see FIG. 1) in the longitudinal direction of the vehicle body 101 (see FIG. 1) is at least partially the same as the position of the rear floor upper cross member 140 (see FIG. 36) in the longitudinal direction of the vehicle body 101. overlaps with

The rear suspension 170 is provided with a trailing arm 171 that swings around a trailing arm fixing portion 172 . Trailing arm 171 is connected to rear suspension arm 173 . A shock absorber 174 is attached to the trailing arm 171 and a coil spring 175 is attached to the rear suspension arm 173 . The left and right trailing arms 171 are connected by a stabilizer bar 176 . A shock absorber 174 of the rear suspension 170 is also depicted in FIG.

Battery pack 200 is designed to have a width that fits between left and right trailing arms 171 . Also, the shape of each part of rear suspension 170 is adjusted so as not to interfere with the rear end of battery pack 200 .

FIG. 38 is a diagram showing the floor structure of vehicle 100 according to the embodiment, in which battery stack 900 and battery pack 200 without heating/cooling device are mounted under the floor in the longitudinal direction of vehicle 100 . 1 is a front perspective view of a floor cut along the center line of the floor; FIG. This figure shows in particular the skeleton members and reinforcing members provided on the upper part of the floor.

The floor panel 102 of the vehicle 100 is formed with a step 102c in front of and behind the front underfloor reinforcement 136 . The floor panel 102 at the front of the vehicle 100 is one step lower than the floor panel 102 at the rear. This corresponds to the fact that in upper case 210 of battery pack 200 , front low ceiling portion 211 is one step lower than rear high ceiling portion 212 .

A front floor panel 102 of the vehicle 100 is joined to a dash panel 151 at its front end. A floor tunnel 110 is formed on the floor panel 102 on the centerline of the vehicle 100 . Floor tunnel 110 is slightly higher than other parts, but this corresponds to the fact that in upper case 210 of battery pack 200, central protrusion 213 is higher than other parts. Also, the floor tunnel 110 has a higher front end, which corresponds to the fact that in the upper case 210 of the battery pack 200, the front raised portion 214 at the front end is one step higher than the other portions. .

A tunnel cover reinforcement 150 is provided on the floor tunnel 110 along the centerline of the vehicle 100 and extends to the stepped portion of the floor panel 102 . The tunnel cover reinforcement 150 has a hat-shaped cross section opening downward. A side sill 154 is also provided in the longitudinal direction of the vehicle 100 . The side sills 154 are arranged at both right and left ends of the vehicle 100 (only the right side sill 154 is shown in the drawing).

A pair of floor side reinforcements 152 are provided symmetrically with respect to the center line of the vehicle 100 (only the right side floor side reinforcement 152 is shown in the figure). The floor upper side reinforcement 152 extends in the front-rear direction of the vehicle 100 and overlaps the floor lower side reinforcement 120 (not shown) arranged under the floor panel 102 in plan view. More specifically, the floor upper side reinforcement 152 overlaps the front part 120b and the rear part 120a of the floor lower side reinforcement 120 when viewed in the vertical direction. In addition, the floor upper side reinforcement 152 has a hat-shaped cross-sectional shape that has a flange portion and is open downward, and is joined to the floor panel 102 at the flange portion. In addition, the flange portion of the floor upper side reinforcement 152 is arranged so as to overlap the flange portions of the floor panel 102 and the floor lower side reinforcement 120 when viewed in the vertical direction, and is welded in a three-layered manner.

A first seat cross member 155 and a second seat cross member 156 are provided in the width direction of the vehicle 100 . These are located under the front seat 105 (see FIG. 1). Second seat cross member 156 is arranged behind first seat cross member 155 in the longitudinal direction of vehicle 100 . The first seat cross member 155 and the second seat cross member 156 both have hat-shaped cross-sectional shapes that open downward and are joined to the floor panel 102 . The first seat cross member 155 and the second seat cross member 156 both pass over the floor side reinforcement 152 , pass through the tunnel cover reinforcement 150 , and are joined to the left and right side sills 154 .

3-3. Underfloor Mounting Structure of Battery Pack The underfloor mounting structure of the battery pack 200 will be described with reference to FIGS. 39 to 45 .

FIG. 39 is a perspective view showing an engagement state between battery pack 200 and a frame structure under the floor when battery pack 200 is mounted under the floor of vehicle 100 according to the embodiment. However, in this figure, illustration of some members constituting the rear part 120a of the underfloor side reinforcement 120 is omitted.

When battery pack 200 is mounted under the floor of vehicle 100, battery pack 200 is housed in a region surrounded by left and right under-floor side reinforcements 120, left and right rear floor side members 132, and rear under-floor cross member 130. be done. The rear portion of battery pack 200, that is, high ceiling portion 212 of upper case 210 is housed in a region surrounded by left and right rear floor side members 132, rear floor lower cross member 130, and front floor lower reinforcement 136. be. The distance between the front parts 120 b of the left and right under-floor side reinforcements 120 is reduced toward the front, which corresponds to the shape of the tip of the battery pack 200 .

FIG. 40 is a bottom view showing a state where battery pack 200 is mounted under the floor of vehicle 100 according to the embodiment. Battery pack 200 housed between left and right underfloor side reinforcements 120 is joined to underfloor side reinforcements 120 by case fixing side arms 410 , 420 , 430 , 440 . In other words, battery pack 200 is held from below by case fixing side arms 410 , 420 , 430 , 440 suspended from under-floor side reinforcement 120 .

The rear portion of battery pack 200 is housed between left and right trailing arms 171 . Interference between the trailing arm fixing portion 172 and the battery pack 200 is a concern when attaching and detaching the trailing arm 171 . However, even the extension plate 655 closest to the trailing arm fixing portion 172 is accommodated inside the trailing arm fixing portion 172 in plan view.

FIG. 41 is a bottom view showing the positional relationship between battery stack 900 and the floor when battery pack 200 is mounted under the floor of vehicle 100 according to the embodiment. Battery stacks 900 are arranged in eight rows in the front-rear direction of vehicle 100 . However, in the rear three rows, the battery stacks 900 are arranged vertically in two stages. The five battery stacks 900 from the top are sandwiched by the underfloor side reinforcements 120 on the left and right sides. Also, although not shown, the two-row, three-row battery stack 900 at the rear is sandwiched between left and right rear suspensions.

FIG. 42 is a bottom view showing a reinforcing structure under the floor of vehicle 100 according to the embodiment. A pair of front side members 153 are provided on the front side of the vehicle 100 . Front side members 153 are frame members that are arranged on the right and left sides in the width direction of vehicle 100 and extend in the front-rear direction of vehicle 100 . A crash box 123 is attached to the front end of the front side member 153 . A bumper reinforcement 122 extending in the width direction is bridged between the left and right crash boxes 123 .

The front side member 153 has its rear end joined to the front end of the front part 120b of the underfloor side reinforcement 120 . A front part 120b of the underfloor side reinforcement 120 extends outward in the width direction of the vehicle 100 toward the rear and is connected to a rear part 120a. The distance between the left and right under-floor side reinforcements 120 increases toward the rear in the front part 120b and becomes constant in the rear part 120a. In addition, in FIG. 42, these members are indicated by solid lines in order to simplify the positional relationship of these members.

When battery pack 200 is mounted on vehicle 100 , a plurality of outer lateral reinforcements are fixed to underfloor side reinforcements 120 via hanging bolts. As a result, the left and right under-floor side reinforcements 120 are connected by a plurality of outer lateral reinforcements. Specifically, the left and right front parts 120 b whose distance increases toward the rear are connected by an outer lateral reinforcement 510 and an outer lateral reinforcement 520 . The left and right rear apartments 120 a are connected by four outer lateral reinforcements 530 .

FIG. 43 is a bottom view showing a state where undercover 195 is attached under the floor of vehicle 100 according to the embodiment. Undercover 195 is provided in a range from the immediate vicinity of front suspension member 160 to the rear end of vehicle 100 so as to cover the entire bottom surface of battery pack 200 . Although not shown, the undercover 195 is arranged so as to overlap the underfloor side reinforcement 120 . Note that the undercover 195 may be a single cover component, or may be composed of a plurality of cover components.

FIG. 44 is a left side view of the rear portion of the floor showing a state where battery pack 200 is mounted under the floor of vehicle 100 according to the embodiment. A rear floor side member 132 is provided at the rear portion of the floor. The rear floor side member 132 is composed of a front portion that curves upward toward the rear and a rear portion that extends straight toward the rear end. The floor panel 102 has a floor panel rear portion 102 a made to match the height of the rear portion of the rear floor side member 132 and a floor panel front portion 102 b made to match the height of the side sill 154 . Therefore, the floor panel 102 has a step 102c between the floor panel rear portion 102a and the floor panel front portion 102b.

The rear end of battery pack 200 extends to rear floor side member 132 past the rear end of underfloor side reinforcement 120 . Since the underfloor side reinforcement 120 is located at a relatively low position, the length of the collar 402 used for fixing the case fixing side arm 430 to the underfloor side reinforcement 120 is short. On the other hand, since the rear floor side member 132 is curved upward as it goes rearward, in order to fix the rearmost case fixing side arm 440 to the rear floor side member 132, the collar 406 longer than the collar 402 is required. Is required. In other words, the use of the long collar 406 enables connection between the rear floor side member 132 and the case fixing side arm 440 .

To fix the rear end of battery pack 200, case fixing rear arm 460 is used instead of a combination of a case fixing side arm and a collar. This will be explained in detail in the next chapter.

FIG. 45 is a front view showing a state in which battery pack 200 is mounted under the floor of vehicle 100 according to the embodiment, and is a front view of the cross-sectional plane of the floor and battery pack 200 in the width direction. The battery pack 200 is sandwiched by a pair of under-floor side reinforcements 120 from left and right. An upper floor side reinforcement 152 is provided on the opposite side of the floor lower side reinforcement 120 with the floor panel 102 interposed therebetween. The under-floor side reinforcement 120 has a deep hat-shaped cross-sectional shape that opens upward, and the above-floor side reinforcement 152 has a shallow hat-shaped cross-sectional shape that opens downward. 102 is interposed therebetween. The floor upper side reinforcement 152 is pressed from above by a seat cross member (only the first seat cross member 155 is shown in FIG. 45) extending in the width direction.

Lower case 300 of battery pack 200 has its bottom surface reinforced and supported by a plurality of reinforcing members. 45, the bottom surface of the lower case 300 is reinforced and supported by an outer lateral reinforcement 530 extending in the width direction, and an outer center vertical reinforcement 610 and an outer side vertical reinforcement 630 extending in the front-rear direction. When viewed from the front, the strut portions 611 and 631 of the outer central vertical reinforcement 610 and the outer side vertical reinforcement 630 overlap the longitudinal side surfaces of the outer lateral reinforcement 530 . Although not shown in the figure, in other combinations of the outer longitudinal reinforcement and the outer lateral reinforcement, the strut portion of the outer longitudinal reinforcement overlaps the longitudinal side surface of the outer lateral reinforcement when viewed from the front. .

A gap is provided between upper case 210 of battery pack 200 and floor panel 102 . The vertical position of battery pack 200 is adjusted by the length of left and right collars (only collar 402 is shown in FIG. 45). Although it will be described in detail later, an elastic member (only the first elastic member 231 is shown in FIG. 45) is provided between the central raised portion 213 of the upper case 210 and the floor tunnel 110 of the floor panel 102. sandwiched.

3-4. Attachment Structure for Rear End of Battery Pack Details of the attachment structure for the rear end of battery pack 200 will be described with reference to FIGS. 46 to 49 .

FIG. 46 is an enlarged perspective view of the rear end of lower case 300 from the lower left rear, showing a state where case-fixing rear arm 460 of battery pack 200 is attached to rear floor lower cross member 130 . The case-fixing rear arm 460 has a hat-shaped cross section that opens toward the rear. The case-fixing rear arm 460 has a folded portion 461 at its upper end, which is the brim portion of the hat folded forward.

A vehicle-side member near the rear end of battery pack 200 is rear floor lower cross member 130 extending in the width direction of vehicle 100 . The rear floor lower cross member 130 is joined to rear floor side members 132 via brackets 134 . However, since there is a distance from lower case 300 of battery pack 200 to rear floor lower cross member 130, it is difficult to fix the battery pack 200 using suspension bolts and collars that are used to fix the sides. Therefore, case fixing rear arm 460 extending from the rear end of lower case 300 is used to fix the rear end of battery pack 200 to vehicle 100 .

A lower end portion of the case fixing rear arm 460 is fastened to an outer rear end bracket 570 . The rear end of battery pack 200 is fixed to vehicle 100 by fastening folded portion 461 at the upper end to rear floor lower cross member 130 . A fastener 471 is used to fasten the outer rear end bracket 570 and the case fixing rear arm 460 , and a fastener 470 is also used to fasten the rear floor lower cross member 130 and the case fixing rear arm 460 . A rib 462 for reinforcement is formed on the rear arm 460 for fixing the case. A rib 462 extends upward through between the two fasteners 471 .

FIG. 47 shows the floor and battery pack 200 mounted under the floor, cut along the longitudinal centerline of vehicle 100, and the floor and battery pack 200 enlarged from the left side. 200 is a rear side view. FIG. Case fixing rear arm 460 is inclined forward in the forward direction of vehicle 100 . More specifically, case fixing rear arm 460 rises straight up from a fastening point with outer rear end bracket 570 , bends forward, and extends to a fastening point with rear floor lower cross member 130 . Accordingly, when battery pack 200 is mounted on vehicle 100 , rear end portion 201 of battery pack 200 is positioned below rear floor under cross member 130 or to the rear of rear floor under cross member 130 .

The case fixing rear arm 460 is arranged at a position where the case fixing rear arm 460 in the rear floor lower cross member 130 is fastened to the rear floor lower cross member 130, and is fixed inside the rear floor lower cross member 130 by welding or the like. Rear floor lower cross member 130 is joined to rear floor upper cross member 140 with floor panel 102 interposed therebetween.

FIG. 48 is a cross-sectional view schematically showing an enlarged joint portion between the rear floor lower cross member 130, the rear floor upper cross member 140, and the floor panel 102. As shown in FIG. Rear floor lower cross member 130 has a hat-shaped cross-sectional shape that opens upward, and rear floor upper cross-member 140 has a hat-shaped cross-sectional shape that opens downward. The open side of the rear floor lower cross member 130 and the open side of the rear floor upper cross member 140 form a closed cross section with the floor panel 102, respectively, and the open side of the rear floor lower cross member 130 and the rear floor upper cross member 140 form a closed cross section. The open side of the cross member 140 faces substantially vertically with the floor panel 102 interposed therebetween.

FIG. 49 is a diagram schematically showing the details of the structure for fixing case fixing rear arm 460 to rear floor lower cross member 130 . A bulkhead 480 for reinforcement is accommodated in the rear floor lower cross member 130 having a hat-shaped cross section. Bulkhead 480 has an open top box or dish shape. The fastener 470 is attached so as to sandwich the bottom portion 131 of the rear floor lower cross member 130 between the bottom portion 481 of the bulkhead 480 and the folded portion 461 of the rear arm 460 for fixing the case.

3-5. Support Structure for Upper Case Next, a support structure for the upper case 210 will be described with reference to FIGS. 50 to 55. FIG.

FIG. 50 is a diagram showing a support structure for upper case 210. Battery pack 200 without battery stack 900 and heating/cooling device is mounted under the floor of vehicle 100 on the longitudinal center line. 2 is a perspective view of the floor and the battery pack 200 when the floor is cut along the line and viewed from the lower left front in an enlarged manner. FIG. A plurality of support legs 390 as support members extend upward from the bottom of lower case 300 . A center plate 370 spans over the upper ends of the support legs 390 arranged along the center line.

A central raised portion 213 of the upper case 210 is positioned directly above the center plate 370 . A plurality of ribs 218 are formed on the rear surface of the central raised portion 213 so as to be spaced apart from each other. Also, the ribs 218 extend in the left-right direction to reinforce the upper case 210 . The rib 218 and the center plate 370 are in contact with each other, and the center plate 370 supports the rib 218 from below. In other words, the support leg 390 serves as a support member that supports the center plate 370 and also as a support member that supports the upper case 210 from below via the center plate 370 and the ribs 218 . The shape of the lower edge of the rib 218 is formed so as to substantially match the shape of the opposing center plate 370 .

A gap is secured between the upper case 210 and the floor panel 102 . Two elastic members 231 and 232 are arranged in this gap and sandwiched between the surface of upper case 210 and the bottom surface of floor panel 102 . The front first elastic member 231 is located directly below the first seat cross member 155 . The rear second elastic member 232 is located directly below the second seat cross member 156 .

FIG. 51 is a diagram showing the support structure of upper case 210, and is a schematic front view of the periphery of center plate 370 when the floor and battery pack 200 are cut in the width direction and viewed from the front. . A support leg 390 that supports the center plate 370 is joined to the partition bracket 340 . The partition bracket 340 is joined to the inner lateral reinforcement 320 that reinforces the bottom panel 301 . The rigidity of the inner lateral reinforcement 320 is further increased by joining the partition bracket 340 . Since the joint between the partition bracket 340 and the inner lateral reinforcement 320 is a rigid body, it can be said that the support leg 390 as a support member extends upward from the rigid body arranged inside the lower case 300 .

The center plate 370 has a depression 372 through which the cable 751 is passed and flanges 371 formed on both sides thereof. The ribs 218 formed on the back surface of the upper case 210 where the flange 371 has a flat surface, more specifically, on the back surface of the central raised portion 213 are provided in two rows when viewed from the front. The right row of ribs 218 abut the flat surface of the right flange 371 and the left row of ribs 218 abut the flat surface of the left flange 371 . The cable 751 passes between the ribs 218 provided in two rows.

Elastic members 231 and 232 (however, in FIG. 51, the second elastic member 232 is hidden behind the first elastic member 231 and cannot be seen) are arranged on the central raised portion 213 . The first elastic member 231 is arranged so that the position of the first elastic member 231 in the width direction is positioned between the support legs 390 arranged in two rows in a front view. In addition, the first elastic member 231 is arranged so that the position of the first elastic member 231 in the width direction is located between the ribs 218 arranged in two rows when viewed from the front. A second elastic member 232 (not shown) is arranged in the same manner as the first elastic member 231 . Note that the position of the elastic members 231 and 232 between two members does not mean that the elastic members 231 and 232 are located between the two members. At least part of the elastic members 231, 232, preferably the center or the center of gravity, should be located between the two members.

A first pedestal 112 is formed at a location of the floor panel 102 in contact with the first elastic member 231 . The first pedestal 112 is recessed upward from the rear surface of the floor panel 102 and regulates the positional displacement of the first elastic member 231 in the front, rear, left, and right directions. A similar pedestal is also formed at a location where the floor panel 102 contacts the second elastic member 232 . In addition, the elastic members 231 and 232 and the upper case 210 are joined with an adhesive, for example.

FIG. 52 is a diagram showing the support structure of upper case 210, and is an enlarged view from the left side of the floor cut along the longitudinal centerline of vehicle 100 with battery pack 200 mounted under the floor. 2 is a side view of the floor and battery pack 200 as seen; FIG. At least two sets of ribs 218 formed in two rows are provided on the rear surface of the central raised portion 213 of the upper case 210 in a side view. The front two rows of ribs 218 are positioned below the first elastic member 231 in side view, and the rear two rows of ribs 218 are positioned below the second elastic member 232 in side view.

The first elastic member 231 is arranged so that the position of the first elastic member 231 in the front-rear direction is positioned between two adjacent support legs 390 in a side view. Further, the first elastic member 231 is arranged so that the position of the first elastic member 231 in the front-rear direction is located between the two rows of ribs 218 in the front in a side view. The second elastic member 232 is arranged such that the position of the second elastic member 232 in the front-rear direction is positioned between two adjacent support legs 390 in a side view. In addition, the second elastic member 232 is arranged so that the position of the second elastic member 232 in the front-rear direction is positioned between the two rear rows of ribs 218 in a side view.

FIG. 53 is a schematic longitudinal sectional view showing the engagement state of the first elastic member 231 with the first pedestal 112 formed on the floor panel 102. As shown in FIG. FIG. 54 is a view showing the state of engagement of the first elastic member 231 with the first seat 112 formed on the floor panel 102, and shows the periphery of the first seat 112 of the floor panel 102 viewed obliquely from below. FIG. 10 is a perspective view of a case in which A downwardly open first seat cross member 155 is joined to the floor panel 102 . The first pedestal 112 is recessed upward from the rear surface of the floor panel 102 inside the first seat cross member 155 . The ceiling surface of the first pedestal 112 is flat and formed parallel to the surface of the upper case 210 . When battery pack 200 is mounted on vehicle 100 , first elastic member 231 is prevented from moving forward, backward, leftward, and rightward by first base 112 , and is positioned between first base 112 and the surface of upper case 210 . is compressed with

FIG. 55 is a view showing the engagement state of the second elastic member 232 with the second seat 113 formed on the floor panel 102, and is a view of the area around the second seat 113 of the floor panel 102 obliquely below. is a perspective view of the. A second seat cross member 156 that opens downward is joined to the floor panel 102 . The second pedestal 113 is recessed upward from the rear surface of the floor panel 102 inside the second seat cross member 156 . The ceiling surface of the second pedestal 113 is flat and formed parallel to the surface of the upper case 210 . When battery pack 200 is mounted on vehicle 100 , second elastic member 232 is prevented from moving forward, backward, leftward, and rightward by second seat 113 , and is positioned between second seat 113 and the surface of upper case 210 . is compressed with

4. Features and Advantages Thereof Features and advantages of the vehicle body structure of the battery pack 200 according to the embodiment and the vehicle 100 according to the embodiment will be listed. However, these are only some of the features of the present disclosure, and the present disclosure is not limited to the features and advantages listed below.

4-1. Supporting Upper Case from Below by Support Legs Battery pack 200 according to the embodiment supports upper case 210 from below by support legs 390, as shown in FIGS. 50 to 52, for example. Since the support leg 390 is joined to a rigid body, the foot of the support leg 390 is stable. By supporting upper case 210 from below with stable support legs 390, vibration of upper case 210 can be suppressed.

Battery pack 200 according to the embodiment has support leg 390 joined to inner lateral reinforcement 320 via partition bracket 340, as shown in FIGS. 12 and 51, for example. By joining the partition bracket 340 to the inner lateral reinforcement 320 which is a rigid body, the rigidity of the lower case 300 can be further increased, so that the upper case 210 can be stably supported.

Further, in the battery pack 200 according to the embodiment, the central portion of the upper case 210 is supported by support legs 390 as shown in FIGS. 50 and 51, for example. Since the central portion of upper case 210 is particularly susceptible to bending, vibration of the upper case can be suppressed by supporting this portion from below.

Further, as shown in FIGS. 9 to 11, a center plate 370 extending in the front-rear direction spans the upper ends of the support legs 390 arranged in two rows in the front-rear direction. By connecting the plurality of support legs 390 via the center plate 370, the rigidity of the entire support structure for supporting the upper case 210 is increased, and the upper case 210 can be stably supported. The center plate 370 has a hat-shaped cross-section, and the support legs 390 also have a hat-shaped cross-section, so that high rigidity can also be ensured.

A rib 218 formed in the central portion of the back surface of upper case 210 improves the rigidity of upper case 210 . Battery pack 200 according to the embodiment supports rib 218 with support leg 390 via center plate 370, as shown in FIGS. 50 to 52, for example. Further, by bringing the center plate 370 into contact with the ribs 218 formed on the back surface of the upper case 210, the upper case 210 can be stably supported regardless of the shape of the upper case surface. Further, as shown in FIG. 51, for example, the upper case 210 can be lifted by bringing the ribs 218 into contact with the flat surfaces formed on the flanges 371 of the center plate 370 and passing the cables 751 through the recesses between the flanges 371. The cable 751 can be arranged without being disturbed by the ribs 218 while being stably supported.

32, each of the battery stacks 900 includes a plurality of claw portions 922 on both sides in the short direction of the battery stack 900, and the plurality of claw portions 922 are connected to the partition bracket 340 and the inner lateral reinforcement 320. As shown in FIG. It is fixed to the inner lateral reinforcement 320 by being sandwiched between. In such a configuration, the battery stack 900 restricts the torsion between the two adjacent inner lateral reinforcements 320, so that the overall rigidity of the support structure supporting the upper case 210 is further increased, and the upper case 210 is stabilized. can be supported by

Battery pack 200 according to the embodiment includes, for example, as shown in FIG. 12 , outer central longitudinal reinforcement 610 extending in the front-rear direction of battery pack 200 below support legs 390 arranged side by side. With such a configuration, the rigidity of the bottom panel 301 at the portion where the support leg 390 is arranged can be increased, so that the upper case 210 can be stably supported.

In battery pack 200 according to the embodiment, support leg 390 is erected from partition bracket 340 , but support leg 390 may be erected directly from inner lateral reinforcement 320 . In that case, the support leg 390 and the inner lateral reinforcement 320 may be fastened with fasteners or welded. Also, since the battery stack 900 is also a rigid body, the support legs 390 may be erected from the battery stack 900 . Since the bottom panel 301 to which the inner lateral reinforcement, the outer lateral reinforcement, or the outer longitudinal reinforcement is fixed can be said to be a rigid body whose deformation is suppressed, the support leg 390 may be erected from the bottom panel 301 . Also, the back surface of upper case 210 may be directly supported by support leg 390 without center plate 370 .

In the battery pack according to the embodiment, low ceiling portion 211 of upper case 210 is supported from below, but high ceiling portion 212 may also be supported from below. Alternatively, of low ceiling portion 211 and high ceiling portion 212, the side with lower rigidity, for example, the longer length in the front-rear direction of battery pack 200 may be supported from below. That is, if the length of the high ceiling part 212 is longer, only the high ceiling part 212 may be supported from below.

Battery pack 200 according to the embodiment can be modified, for example, as follows. 56(a) and 56(b) are schematic longitudinal sectional views showing modifications of the support structure of the upper case 210. FIG. In each variation, upper case 210 and support leg 390 are directly joined by fasteners 250 . The portions to be fastened by the fasteners 250 are each sealed with a sealing material 252 for waterproofing. In the modification shown in FIG. 5A, a dome-shaped sealing material 252 is used. A dome-shaped seal 252 is glued over the nut or fitted at the bottom between the nut and upper case 210 . In the modification shown in FIG. 5A, a disk-shaped seal member 252 is used. A disk-shaped sealing material 252 is sandwiched between the nut and the upper case 210 . According to such a configuration, upper case 210 can be fixed to support leg 390 with a simple configuration while maintaining liquid tightness.

4-2. Connection Structure of Inner Lateral Reinforcement by Outer Lateral Reinforcement As shown in FIG. 10, for example, the battery pack 200 according to the embodiment has a plurality of inner lateral reinforcements (inner lateral reinforcing members) alternately arranged in the front-rear direction. 320 , 330 and a plurality of outer lateral reinforcements (outer lateral reinforcing members) 510 , 520 , 530 , 540 , 550 , 560 . Each of the outer lateral reinforcements 510 , 520 , 530 , 540 , 550 , 560 is joined to two adjacent inner lateral reinforcements 320 , 330 together with the bottom panel 301 . In the example shown in FIG. 12, two adjacent inner lateral reinforcements 320 are welded together with the bottom panel 301 by an outer lateral reinforcement 530 disposed therebetween. With such a configuration, the rigidity of lower case 300 can be increased. In addition, the rigidity of the entire support structure for supporting upper case 210 is further increased, and upper case 210 can be stably supported.

4-3. Connection Structure of Outer Lateral Reinforcement by Outer Vertical Reinforcement As shown in FIGS. ) 610, 620, 630, 640, 650 and the bottom panel 301, sandwiching the outer lateral reinforcement (outer lateral reinforcement member) 510, 520, 530, 540, 550, 560, and welding these three members are joined. By reinforcing the bottom panel 301 in this way, the rigidity of the lower case 300 can be increased. In addition, the rigidity of the entire support structure for supporting upper case 210 is further increased, and upper case 210 can be stably supported.

Further, as shown in FIG. 14 , for example, the outer central longitudinal reinforcement 610 includes a strut portion 611 between the outer lateral reinforcement 530 and the outer lateral reinforcement 530 adjacent to each other. Further, for example, the outer side vertical reinforcement 630 has a strut portion 631 between the outer lateral reinforcement 530 and the outer lateral reinforcement 530 adjacent to each other. Both ends of these strut portions 611 and 631 in the front-rear direction widen as they approach the outer lateral reinforcement (outer lateral reinforcement 510, 520, and 530 in the example shown in FIG. 14), and as shown in FIG. In addition, it overlaps with the longitudinal side surface of the outer lateral reinforcement (outer lateral reinforcement 530 in the example shown in FIG. 14) when viewed from the front. According to such a structure, the load applied to the battery pack 200 in the front-rear direction can be effectively dispersed in the width direction.

Further, as shown in FIG. 14 , the ridgeline 633 of the outer central longitudinal reinforcement 610 is curved from the front-rear direction to the longitudinal direction so as to follow the shape of the ridgeline 531 of the outer lateral reinforcement 530 . A ridge line 631 of the outer side longitudinal reinforcement 630 is curved from the front-rear direction to the longitudinal direction so as to follow the shape of the ridge line 531 of the outer lateral reinforcement 530 . According to such a structure, the load applied to the battery pack 200 in the front-rear direction can be effectively dispersed in the width direction.

In addition, as shown in FIG. 14, the valley line (starting point of the flange portion) of the outer central longitudinal reinforcement 610 is curved from the front-rear direction to the longitudinal direction so as to follow the shape of the valley line of the outer lateral reinforcement 530. ing. In addition, the valley line of the outer side longitudinal reinforcement 630 is curved from the front-rear direction to the longitudinal direction so as to follow the shape of the valley line of the outer lateral reinforcement 530 . According to such a structure, the load applied to the battery pack 200 in the front-rear direction can be effectively dispersed in the width direction.

4-4. Three-Dimensional Reinforcement of Battery Pack by Middle Frame As shown in FIGS. 18 and 19, for example, the second floor 360 at the rear of the middle frame 385 is constructed by combining frames 362, 363, and 364 with hollow cross sections. 9 and 10, the second floor 360 is supported at its four corners and the center in the width direction by a plurality of support legs 390 and 391, and further supported on both sides in the width direction by support walls 392. ing. By assembling such a three-dimensional reinforcing structure, the rigidity of the rear portion of the lower case 300 is improved, and it is possible to cope with the double stacking of the battery stack 900 .

Center plate 370 on which cable 751 is laid extends forward of battery pack 200 so as to straddle battery stack 900 . Thereby, interference between the cable 751 and the battery stack 900 can be suppressed, and the mounting amount of the battery stack 900 can be increased. Further, as shown in FIG. 13, for example, the support leg 390 that supports the center plate 370 extends upward from the partition bracket 340 that partitions the battery stacks 900 from each other. That is, the support leg 390 is arranged above the partition bracket 340 . Thereby, the space in the battery pack 200 can be effectively utilized. Also, the support leg 390 is arranged above the inner lateral reinforcement 320 . Thereby, the space in the battery pack 200 can be effectively utilized.

4-5. Installation of elastic member in gap between floor panel and upper case In battery pack 200 according to the embodiment, for example, as shown in Figs. It sandwiches the elastic members 231 and 232 . By sandwiching upper case 210 from above and below with elastic members 231 and 232 and support leg 390, vibration of upper case 210 can be suppressed. In particular, since upper case 210 is not sandwiched between rigid bodies, but elastic members 231 and 232 are provided on one side, vibrations generated in upper case 210 can be absorbed by elastic members 231 and 232 . In addition, since the gap between upper case 210 and floor panel 102 can be kept small, the capacity of battery pack 200 can be increased and the minimum ground clearance can be increased.

Pedestals 112 and 113 recessed upward from the rear surface of the floor panel 102 are formed at locations where the floor panel 102 contacts the elastic members 231 and 232, as shown in FIGS. 53 to 55, for example. Further, since the portions on the floor panel 102 where the elastic members 231 and 232 are arranged overlap with the seat cross members 155 and 156, their rigidity is ensured. With such a structure, elastic members 231 and 232 can be stably sandwiched between floor panel 102 and upper case 210 .

Elastic members 231 and 232 are located between two adjacent support legs 390 in the front-rear direction of battery pack 200 as shown in FIG. 52 when battery pack 200 is viewed from the side. are arranged to 51, elastic members 231 and 232 in the width direction of battery pack 200 are positioned between two adjacent support legs 390 when viewed from the front of the battery pack. ing. By arranging the support legs 390 so as to surround the elastic members 231 and 232 , the upper case 210 can be stably supported between the elastic members 231 and 232 .

Elastic members 231 and 232 are located between two adjacent ribs 218 in the front-rear direction of battery pack 200 as shown in FIG. 52, for example, when battery pack 200 is viewed from the side. are arranged as 51, elastic members 231 and 232 in the width direction of battery pack 200 are positioned between two adjacent ribs 218 when viewed from the front of the battery pack. there is By arranging the ribs 218 so as to surround the elastic members 231 and 232 , the upper case 210 can be stably supported between the elastic members 231 and 232 . In addition, since the ribs 218 increase the rigidity of the upper case, the elastic members 231 and 232 can be stably sandwiched between the floor panel 102 and the upper case 210 .

4-6. Reinforcement of Vehicle Frame by Reinforcement Structure of Battery Pack Battery pack 200 according to the embodiment has outer longitudinal reinforcements (outer longitudinal reinforcing members) 610, 620, 610, 620, and 620 extending in the longitudinal direction of battery pack 200, as shown in FIG. 630, 640, 650 and outer lateral reinforcements (outer lateral reinforcing members) 510, 520, 530, 540, 550, 560 extending in the width direction of battery pack 200 are combined. This lattice combination improves the rigidity of the bottom panel 301 . Thereby, the strength of battery pack 200 against external force can be increased.

Further, in the battery pack 200 according to the embodiment, as shown in FIG. 42 for example, the front outer lateral reinforcements 510, 520, 530 are attached to the underfloor side reinforcements 120, which are reinforcing members of the vehicle 100. . With such a configuration, the load applied to underfloor side reinforcement 120 can be distributed to the reinforcing structure of battery pack 200 . In particular, since the two front outer lateral reinforcements 510 and 520 are attached to the front part 120b whose distance increases toward the rear, the under-floor side reinforcements 120 are attached from the front through the front side members 153 and the like. is transmitted, deformation of the under-floor side reinforcement 120 can be prevented.

FIG. 57 is a diagram for explaining the function and effect of the reinforcement structure for the underfloor and battery pack 200 of vehicle 100 according to the embodiment. For the sake of simplification, the center and left and right outer longitudinal reinforcements 601, 602, 603 are shown as one member. Of course, the outer longitudinal reinforcements 601, 602, 603 may be actually formed by such a single member. Also, for the sake of simplification, the underfloor side reinforcement 120 is drawn from above in FIG.

When a load is applied from the front of vehicle 100 as indicated by arrows in the drawing, part of the load is applied to under-floor side reinforcement 120 and above-floor side reinforcement 152 . The load applied to the underfloor side reinforcement 120 is distributed to the outer lateral reinforcements 510 , 520 , 530 and further to the outer longitudinal reinforcements 601 , 602 , 603 . When a load is applied from the rear of the vehicle 100, part of the load is applied to the outer longitudinal reinforcements 601, 602, 603 via the rearmost outer lateral reinforcement 560, and the outer lateral reinforcements 510, 520, distributed to 530,540,550. Furthermore, it is distributed to the under-floor side reinforcement 120 and the above-floor side reinforcement 152 . When a load is applied from the side of the vehicle 100, part of the load is applied to the outer lateral reinforcements 510, 520, 530 via the floor underside reinforcement 120, and the outer longitudinal reinforcements 601, 602, 603 are generated. distributed to That is, the reinforcing structure of battery pack 200 cooperates with underfloor side reinforcement 120 , which is a reinforcing member on the vehicle 100 side, to disperse the load applied to vehicle 100 .

4-7. Support of Battery Pack by Cross Members Constituting Annular Skeleton As shown in FIG. have. More specifically, the annular frames are arranged in an upper frame 148 arranged on the upper side of the vehicle and arranged in a U shape with an opening facing downward, and an upper skeleton 148 arranged on the lower side of the vehicle and arranged in a U shape with an opening facing upward. The lower frame 149 overlaps with the lower frame 149 at a portion extending in the vertical direction of the vehicle to form an annular shape.

In this embodiment, as shown in the supplementary drawing of FIG. 58, the upper skeleton 148 is arranged to cover the lower skeleton 149 . The upper frame 148 is formed in a U shape with the opening facing downward when viewed from the front of the vehicle by connecting the roof reinforcement 143 to the inner side in the width direction of the left and right quarter pillar outer reinforcements 142 arranged on the outside of the passenger compartment. It is formed. The lower frame 149 is formed in a U shape with an opening facing upward when viewed from the front of the vehicle by connecting the rear floor upper cross member 140 to the width direction inner sides of the left and right quarter pillar inner reinforcements 141 arranged inside the vehicle compartment. formed into a shape. In this manner, the upper skeleton 148 and the lower skeleton 149 are overlapped in at least a partial section in the vertical direction. In addition, the upper skeleton 148 and the lower skeleton 149 may be formed by joining a larger number of subdivided members.

The roof reinforcement 143 extends in the width direction and has a hat-shaped cross section, and may be overlapped with an inner panel (not shown) to form a closed cross section. The quarter pillar outer reinforcement 142 extends in the vertical direction and has a hat-shaped cross section. A closed cross-section may be formed with panel 146 . The quarter pillar inner reinforcement 141 extends in the vertical direction and has a hat-shaped cross section. A closed cross section may be formed between The quarter pillar inner reinforcement 141 and the wheelhouse outer panel 144 are arranged to face each other in a portion thereof and are lap-welded directly or with the rear pillar inner panel 146 interposed therebetween.

Further, as shown in FIGS. 47 and 48, for example, a rear floor lower cross member 130 is joined to a rear floor upper cross member 140 forming an annular frame with the floor panel 102 interposed therebetween. More specifically, the flange portion of the rear floor upper cross member 140, the floor panel 102, and the flange portion of the rear floor lower cross member 130 are overlapped and welded. Further, case fixing rear arm 460 for fixing battery pack 200 is fixed to rear floor lower cross member 130 . According to such a configuration, the heavy rear portion of battery pack 200 can be supported by the highly rigid annular frame of vehicle 100 .

4-8. Suspension Support of Battery Pack Rear End by Rear Floor Lower Cross Member In the vehicle body structure of vehicle 100 according to the embodiment, for example, as shown in FIG. there is Therefore, the underfloor side reinforcement 120 is discontinued at the floor panel front portion 102b. A rear floor side member 132 that curves upward toward the rear is arranged under the floor panel rear portion 102a.

With respect to the rear floor side member 132 curved in this way, the distance from the lower case 300 is increased, or the lower surface of the rear floor side member 132 is inclined. A trailing arm anchor may also be provided. In these cases, it is difficult to fix the underfloor side reinforcement 120 using suspension bolts. However, by extending the case fixing rear arm 460 upward from the rear end of the lower case 300 and fixing it to the rear floor lower cross member 130 , the rear end of the battery pack 200 can be suspended from the lower case 300 . part can be stably held.

4-9. Closed Sectional Structure of Rear End of Lower Case Battery pack 200 according to the embodiment includes bottom panel 301, outer lateral reinforcement 560, and outer rear end bracket 570, as shown in FIGS. , and the rear end inner bracket 580 at the rear end of the lower case 300 . FIG. 59 is a supplemental view of FIG. 21, and is a perspective view showing in detail the welding point of the rear end of lower case 300. As shown in FIG. Since case fixing rear arm 460 is fixed to outer rear end bracket 570 that forms a highly rigid closed cross-sectional structure, it is possible to stably hold the rear end of battery pack 200 .

FIG. 60 is a schematic longitudinal sectional view showing a modification of the structure of the rear end portion of lower case 300 to which case fixing rear arm 460 is fixed. Instead of the closed section structure composed of a plurality of members, a single member (for example, an extruded aluminum member) 590 having a closed section may be provided at the rear end portion of the lower case 300 to fix the rear arm 460 for fixing the case.

4-10. Connection between Outer Side Vertical Reinforcement by Outer Corner Reinforcement and Outer Lateral Reinforcement at Rear End Battery pack 200 according to the embodiment has curved outer corner reinforcement 660 as shown in FIGS. 24 and 25, for example. connects the outer side longitudinal reinforcement 650 and the outer lateral reinforcement 560 at the rear end. The shape of the ridgeline and valley line of the outer corner reinforcement 660 is curved along the shape of the ridgeline and valley line of the outer side longitudinal reinforcement 650 and the outer lateral reinforcement 560 . As a result, when a load acts on the outer lateral reinforcement 560 from the rear of the vehicle 100, the applied load is transferred from the outer lateral reinforcement 560 extending in the left-right direction to the outer side longitudinal reinforcement extending in the front-rear direction while suppressing stress concentration. 650 can be efficiently transmitted.

4-11. Battery Stack Support by Multiple Reinforcements Battery pack 200 according to the embodiment has inner lateral reinforcement 320 and outer lateral reinforcement 530 superimposed on bottom panel 301 as shown in FIGS. The outer lateral reinforcement 530 and the outer central longitudinal reinforcement 610 are overlapped and welded to the bottom panel 301 . Thus, by overlapping and joining a plurality of reinforcements to the bottom panel 301, the rigidity of the lower case 300 can be increased, and the battery stack 900 can be stably supported.

13 and 32, the battery pack 200 according to the embodiment does not fix the battery stack 900 directly on the bottom panel 301, but attaches the battery stack 900 to the inner lateral reinforcement 320. Fixed. According to such a configuration, it is possible to prevent the load from being directly transmitted to the battery stack 900 .

4-12. Protection of Battery Pack by Outer Lateral Reinforcement and Outer Vertical Reinforcement In the vehicle body structure of vehicle 100 according to the embodiment, for example, as shown in FIGS. It is reinforced with outer longitudinal reinforcement. These reinforcements function as protective members for protecting the vehicle 100 from the impact of the obstacle 4 on the road 2 when the bottom of the vehicle 100 hits the obstacle 4 on the road 2 as shown in FIG. Further, by providing an undercover 195 shown in FIG. 43 below the plurality of outer lateral reinforcements and outer longitudinal reinforcements arranged in a frame shape, it is possible to further suppress impacts applied to the battery pack 200 .

Also, as shown in FIG. 61, due to the positional relationship between the front wheels 103 and rear wheels 104 and the battery pack 200 disposed between the front wheels 103 and rear wheels 104, the battery pack 200 is positioned closer to the rear than the rear during normal running. It is easier to hit the bottom more vigorously from the center to the front. In this regard, the battery pack 200 according to the embodiment, for example, as shown in FIG. The arrangement density between the outer lateral reinforcements 510, 520, 530 is increased. Further, as shown in FIG. 13, for example, the outer lateral reinforcement 530 fixed to the rear part 120a of the underfloor side reinforcement 120 is arranged directly below the battery stack 900. As shown in FIG.

4-13. Arrangement of Baffle Plates on Inner and Lateral Reinforcement Battery pack 200 according to the embodiment, for example, as shown in FIGS. Plates 712 and 722 are arranged on the inner lateral reinforcement 320 . More specifically, support leg 390 and baffle plates 712 and 722 are arranged in the front-rear direction of battery pack 200 and joined to partition bracket 340 . With such a configuration, the space in battery pack 200 can be effectively utilized.

4-14. Protection of Battery Stacks by Air Ducts Battery pack 200 according to the embodiment has air ducts 702 and 704 extending along the front-rear direction of battery pack 200 on the outside in the width direction of a plurality of battery stacks 900 , as shown in FIG. 26, for example. , 705 and 706 are arranged. When a lateral impact load acts on battery pack 200 from the outside in the width direction, at least one of these fan ducts 702, 704, 705, 706 absorbs the impact. Thereby, the impact input to the battery cell 901 can be reduced.

4-15. Alternating Arrangement of Left and Right Air Distribution Portions In battery pack 200 according to the embodiment, for example, as shown in FIG. Air distribution portions 711 and 721 are arranged. Also, although not shown, air distribution portions 711 and 721 are alternately arranged in the left and right second floor air ducts 705 and 706, respectively. According to the arrangement of the air distribution portions 711 and 721 in this manner, the number of the air distribution portions 711 and 721 in each of the left and right air ducts 702 and 704 and the left and right second floor air ducts 705 and 706 can be reduced. can be reduced. In other words, in the left and right air ducts 702 , 704 and the left and right second floor air ducts 705 , 706 , air can be efficiently blown up to the ends on the side opposite to the blower 700 . Further, by arranging the air distribution portions 711 and 721 as described above, the difference in pressure loss amount between the right fan duct 702 and the left fan duct 704 can be reduced. As a result, the difference in load applied to the left and right blowers 700 can be reduced.

4-16. Inclined Arrangement of Baffle Plates from Air Distributor Side to Opposite Side Battery pack 200 according to the embodiment, as shown in FIG. The rear walls 715 and 725 are provided with inclined air guide plates 712 and 722 so that the distance to the rear surface of the air conditioner 900 is reduced. The cooling air blown inside battery pack 200 from air distribution portions 711 and 721 is guided by air guide plates 712 and 722 and sent to the rear surface of battery stack 900 . The inclination of 725 suppresses uneven supply of cooling air in the longitudinal direction of the battery stack 900 . As a result, the difference in the amount of cooling between the battery cells 901 closer to the air distribution portions 711 and 721 and the battery cells 901 farther from them can be reduced.

5. Others In the above-described embodiments, many of the frame members and reinforcing members use members having a hat-shaped cross-sectional shape. It does not have to be a member. In addition, in the above-described embodiments, most of the joints between members are joined by welding or by fasteners. good too. Depending on the materials of the members, they may be joined by an adhesive, for example.

2 road; 4 obstacle; 100 vehicle; 101 vehicle body; 102 floor panel;
102a floor panel rear; 102b floor panel front; 103 front wheel;
104 rear wheel; 105 front seat; 106 rear seat;
110 floor tunnel; 112 first pedestal; 113 second pedestal;
120 underfloor side reinforcement; 120a rear apartment;
120b front part; 122 bumper reinforcement;
123 crash box; 130 rear floor lower cross member; 131 bottom;
132 rear floor side member; 132a opening for fixing trailing arm;
134 bracket; 136 front floor lower reinforcement;
140 rear floor upper cross member; 141 quarter pillar inner reinforcement;
142 quarter pillar outer reinforcement; 143 roof reinforcement;
144 wheel house outer panel; 145 wheel house inner panel;
146 rear pillar inner panel; 148 upper skeleton; 149 lower skeleton;
150 tunnel cover reinforcement; 151 dash panel;
152 Side reinforcement above the floor; 153 Front side member;
154 side sill; 155 first seat cross member;
156 second seat cross member; 160 front suspension member;
170 rear suspension; 171 trailing arm;
172 Trailing Arm Fixture; 173 Rear Suspension Arm;
174 shock absorber; 175 coil spring;
176 stabilizer bar; 179 shock absorber fixing part;
195 undercover; 200 battery pack; 201 rear end;
210 upper case; 211 low ceiling section; 212 high ceiling section; 213 central raised section;
214 front ridge; 215 sealing member; 216 reinforcing groove; 218 rib;
220 flange; 221 fastener; 231 first elastic member; 232 second elastic member;
250 Fastener; 252 Seal; 300 Lower Case; 301 Bottom Panel;
302a-302g reinforcing recesses; 305 case back; 310 flanges;
320 Inner lateral reinforcement; 321 Weld allowance; 330 Inner lateral reinforcement;
340 partition bracket; 341 base; 342 partition wall;
343 cell case fixing part; 344 fastener; 350 fixing base;
351 Alignment Pin; 358 Inner Tip Longitudinal Reinforcement; 360 Second Floor; 361 Second Floor Panel; 362 Second Floor Longitudinal Frame;
362a flange; 363 second floor transverse frame; 363a flange 364 second floor central frame; 364a flange;
366 divider bracket; 370 center plate; 371 flange;
372 recess; 374 fastener; 375 shim plate; 380 center beam;
381 side beam; 385 middle frame; 390 support leg;
391 SUPPORT LEG; 392 SUPPORT WALL; 394 SUPPORT LEG;
395 support leg; 400 suspension bolt; 402 collar;
404 Suspension bolt; 406 Collar; 410 Case fixing side arm;
411 lid plate; 412 extension plate; 420 case fixing side arm;
421 lid plate; 422 extension plate; 430 case fixing side arm;
431 lid plate; 432 extension plate; 440 case fixing side arm;
441 lid plate; 460 rear arm for fixing case; 461 folded part;
462 Rib; 470 Fastener; 471 Fastener; 480 Bulkhead;
510 Lateral Reinforcement; 511 Ridgeline; 520 Lateral Reinforcement;
521 ridgeline; 530 lateral reinforcement; 531 ridgeline;
540 Lateral Reinforcement; 550 Lateral Reinforcement;
560 outer lateral reinforcement; 561a inner valley line; 561b inner ridgeline;
561c outer valley line; 561d outer ridge line; 562 rear surface; 570 outer rear end bracket;
571 bracket rear surface; 572 bracket side surface; 573 support surface;
580 rear end inner bracket; 590 closed section part;
601-603 Outer Longitudinal Reinforcement; 610 Outer Central Longitudinal Reinforcement;
611 thrust portion; 613 ridgeline; 614 pressing portion; 615 welding allowance;
620 Outer Central Longitudinal Reinforcement; 630 Outer Side Longitudinal Reinforcement;
631 thrust portion; 633 ridgeline; 634 pressing portion; 635 welding allowance;
640 Outer Side Longitudinal Reinforcement; 650 Outer Side Longitudinal Reinforcement;
655 extension plate; 660 outside corner reinforcement;
661a, 661b inner corner top; 662a, 662b inner corner bottom;
663a, 663b outside corners above; 664a, 664b outside corners below;
665a inner valley line; 665b inner ridge line; 665c outer valley line; 665d outer ridge line;
700 blower; 702 right air duct; 704 left air duct;
705 second floor left air duct; 706 second floor right air duct;
711 air distribution part; 712 baffle plate; 713 bracket; 714 packing;
715 rear wall; 721 air distribution part; 722 baffle plate; 723 bracket;
724 packing; 725 rear wall; 750 service plug; 751 cable;
760 Junction Box; 801 Weld Point; 802 Weld Point;
803 Weld Point; 811 Bolt; 812 Nut; 900 Battery Stack;
901 battery cell; 905 power distribution equipment; 910 end plate;
912 stack support bracket; 920 cell case; 922 claw;
930 heater; 950 battery ECU; 951 battery ECU

Claims (23)

In the battery pack installed under the floor of the vehicle,
a lower case on which a battery stack is placed and fixed under the floor;
an upper case attached to the lower case;
a support member extending upward from a rigid body provided inside the lower case to support the upper case from the rear surface;
A battery pack comprising: 2. The battery pack according to claim 1, wherein the support member supports the upper case from the rear surface at a central portion in the width direction of the battery pack. 3. The battery pack according to claim 1, further comprising an elastic member provided on the surface of the upper case and sandwiched between the upper case and the lower surface of the floor. A plurality of the support members are provided in the front-rear direction of the battery pack,
The elastic member is arranged so that the position of the elastic member in the front-rear direction of the battery pack is positioned between the two adjacent support members in a side view of the battery pack. The battery pack according to claim 3. A plurality of the support members are provided in the width direction of the battery pack,
The elastic member is arranged so that the position of the elastic member in the width direction of the battery pack is positioned between two adjacent support members when the battery pack is viewed from the front. The battery pack according to claim 3 or 4. A rib protruding downward is provided on the back surface of the upper case,
6. The battery pack according to claim 1, wherein the rib of the upper case is supported by the supporting member. 7. The battery pack according to claim 6, wherein a plurality of said ribs are spaced apart from each other, and a cable is passed between said ribs. A plurality of ribs protruding downward are provided on the back surface of the upper case in the front-rear direction of the battery pack,
The upper case has a plurality of ribs supported by the supporting member,
The elastic member is arranged so that the position of the elastic member in the front-rear direction of the battery pack is positioned between two adjacent ribs in a side view of the battery pack. Item 6. The battery pack according to any one of Items 3 to 5. A plurality of ribs protruding downward are provided on the back surface of the upper case in the width direction of the battery pack,
The upper case has a plurality of ribs supported by the supporting member,
The elastic member is arranged so that the position of the elastic member in the width direction of the battery pack is located between two adjacent ribs when the battery pack is viewed from the front. Item 9. The battery pack according to any one of items 3 to 5 and 8. a plurality of the support members are arranged in two rows in the front-rear direction of the battery pack at the center in the width direction of the battery pack;
A center plate extending in the front-rear direction of the battery pack spans over the upper ends of the plurality of support members arranged in two rows,
The battery pack according to any one of claims 6 to 9, wherein the rib abuts on the center plate. Flat surfaces contacting the ribs are formed on both ends of the center plate in the width direction of the battery pack,
11. The battery pack according to claim 10, wherein a depression through which a cable passes is formed in the central portion of the center plate in the width direction of the battery pack. The upper case is formed in a stepped shape with a lower front portion in the front-rear direction of the battery pack and a higher rear portion. The battery pack according to any one of claims 1 to 11, wherein the battery pack is supported by the support member. 13. The battery pack according to any one of claims 1 to 12, wherein the support member is a plate whose cross section perpendicular to the vertical direction of the battery pack is processed into a hat shape. the battery pack includes an inner lateral reinforcing member provided inside the lower case and extending in the width direction of the battery pack,
14. The battery pack according to any one of claims 1 to 13, wherein the supporting member is fixed to the inner lateral reinforcing member. The battery pack includes a bracket extending in the width direction of the battery pack and joined to the inner lateral reinforcing member with fasteners,
15. The battery pack according to claim 14, wherein said support member is joined to said bracket. a plurality of the inner lateral reinforcing members are arranged side by side in the front-rear direction of the battery pack;
a plurality of the battery stacks are arranged between the two inner lateral reinforcing members arranged in the front-rear direction of the battery pack with their longitudinal directions facing the width direction of the battery pack;
Each of the plurality of battery stacks is provided with a plurality of claw portions on both sides in the short direction of the battery stack. 16. The battery pack according to claim 15, wherein the battery pack is fixed to a member. the battery pack includes an outer lateral reinforcing member provided outside the lower case and extending in the width direction of the battery pack,
a plurality of the inner lateral reinforcing members and a plurality of the outer lateral reinforcing members are alternately arranged in the front-rear direction of the battery pack;
17. The battery pack according to any one of claims 14 to 16, wherein each of said outer lateral reinforcing members is joined to two adjacent inner lateral reinforcing members together with said lower case. 18. The battery pack according to claim 17, wherein each of said outer lateral reinforcing members is joined together with said lower case to said two adjacent inner lateral reinforcing members by welding. The battery pack includes an outer longitudinal reinforcing member provided outside the lower case and extending in the longitudinal direction of the battery pack,
19. The outer longitudinal reinforcing member and the lower case sandwich a plurality of the outer lateral reinforcing members, and are joined to the lower case together with the plurality of outer lateral reinforcing members. battery pack. 20. The battery pack according to claim 19, wherein the outer longitudinal reinforcing member is joined to the lower case together with the plurality of outer lateral reinforcing members by welding. a plurality of the support members arranged side by side in the front-rear direction of the battery pack at the center in the width direction of the battery pack;
21. The battery pack according to claim 20, wherein the outer vertical reinforcing member is provided below the plurality of supporting members arranged side by side. 3. The battery pack according to claim 1, wherein the upper case and the support member are joined by fasteners. a battery pack installed under the floor of the vehicle;
an elastic member sandwiched between the lower surface of the floor and the battery pack,
The battery pack is
a lower case on which a battery stack is placed and fixed under the floor;
an upper case attached to the lower case and having the elastic member mounted thereon;
a support member extending upward from a rigid body provided inside the lower case to support the upper case from the rear surface;
A vehicle characterized by comprising:

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