JP4394782B2 - Vehicle battery mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle battery mounting structure, and more particularly to a vehicle battery mounting structure in which a battery is mounted at the rear of a vehicle body.
[0002]
[Prior art]
An electric vehicle or a vehicle such as a so-called hybrid vehicle that is driven by using an engine and an electric motor for traveling is equipped with a large-scale battery or a large number of batteries for supplying electric power to the electric motor. Such a battery is stored in a general battery case and mounted under the floor of the vehicle.
[0003]
However, when placing a battery case under the floor, it is necessary to provide a highly waterproof structure because it is necessary to effectively prevent water from entering even in adverse environments such as water splashing from the road surface or landing of vehicles. There is. In addition, since the battery is heavy and exposed to the outside, various reinforcing members are required to have high rigidity, and the battery case is damaged due to interference between the battery case and the road surface, especially when driving on rough roads. Therefore, it is necessary to make the battery case itself highly rigid.
[0004]
For this reason, when a battery case is arranged under the floor, there is a concern that the battery case, the reinforcing structure, and the like are enlarged, resulting in an increase in vehicle weight and an increase in manufacturing cost.
[0005]
As a countermeasure against this, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-255746 and as shown in a cross-sectional view of a main part in FIG. 5, a backrest provided on a rear seat 101 provided at the rear part of a passenger compartment 100 of an electric vehicle. 102 has a battery case 110 formed by bolting a case front 111 formed of an iron plate on the rear surface and a case rear 112 made of a resin material fixed on a floor 104 in the trunk room 103 by a stay 106, A battery mounting structure has been proposed in which a mounting leg Ba formed at the lower side of a battery B disposed in the battery case 110 is bolted to a stay 106 via a bolt hole at the bottom of the case rear 112.
[0006]
[Problems to be solved by the invention]
According to Japanese Patent Laid-Open No. 10-255746, since the battery case 110 is disposed in the front portion of the trunk room 103 behind the passenger compartment 100, when an impact load is applied from the front or rear of the vehicle body, There is no impact load acting on the battery case 110, the impact load affecting the battery case 110 can be reduced, and the battery case 110 is not exposed to the outside of the vehicle body, so that the battery case 110 is not flooded. Further, interference between the battery case 110 and the road surface can be avoided. As a result, the reinforcement structure and waterproof structure of the battery case can be simplified, and the battery case can be reduced in size and the manufacturing cost can be reduced.
[0007]
However, in a relatively small vehicle with limited space in the trunk room, it is difficult to secure a sufficient crash stroke against an impact load from the rear of the vehicle body, and effective battery protection may not be achieved. is there.
[0008]
In addition, by providing a trunk space behind the rear seat in the passenger compartment, a so-called two-box type vehicle that does not have an independent trunk room similarly ensures a sufficient crash stroke when an impact load is applied to the rear of the vehicle body from the rear. Is difficult.
[0009]
In addition, there is a concern that the useful capacity of the trunk room or the trunk space is greatly reduced by the battery case and the convenience is lowered.
[0010]
Accordingly, an object of the present invention was made in view of the above, when the impact load from the vehicle body rear acts, absorption and protection of the battery efficient impact load by ensuring a sufficient crush stroke is obtained and An object of the present invention is to provide a vehicle battery mounting structure that can secure an effective capacity of a trunk room or a trunk space .
[0012]
[Means for Solving the Problems]
Mounting structure for a vehicle battery of claim 1 to achieve the above Symbol purpose is mounted in a vehicle battery battery box for accommodating a battery on disposed the battery cradle that on the floor in the rear part of the vehicle body is mounted In the structure, the battery mount includes a battery mounting portion that supports the battery box, and a front leg portion that is supported between the front portion of the battery mounting portion and the floor and supports the front portion of the battery mounting portion. A rear leg portion supported between the rear portion of the battery mounting portion and the floor to support the rear portion of the battery mounting portion , and the front leg portion and the rear leg portion with respect to the battery mounting portion . formed fragile, the battery box and the battery cradle is arranged between the floor and the rear seat, the rear seat is disposed above the battery box sheet A substantially rectangular seat cushion frame that supports the cushion, a pair of front legs that are laid between the front corners of the seat cushion frame and the floor in front of the battery box and the battery mount and outside the width, and the battery box And a seat support portion having a pair of rear legs provided between each rear end corner portion of the seat cushion frame and the floor at the rear of the battery mount and outside the width .
[0013]
According to the first aspect of the present invention, the deformation of the front leg portion and the rear leg portion of the battery pedestal formed relatively weakly prevents an increase in floor rigidity due to the battery pedestal. As a result, when an impact load of a predetermined level or more is applied from the rear of the vehicle body to the rear of the vehicle body, the floor is crushed and deformed, the crash stroke is ensured, sufficient shock absorption is obtained, and safety is ensured. The strongly formed battery mounting portion is prevented from being deformed to prevent deformation of the battery box supported by the battery mounting portion, and damage to the battery or the like stored in the battery box is avoided.
Furthermore, since the battery box and the battery stand are disposed below the rear seat, an effective capacity of a trunk space or a trunk room disposed on the floor behind the rear seat is ensured, and the portion is effectively used as a crash stroke. Can act. In addition, the seat cushion frame of the seat support portion and the pair of front legs and the pair of rear legs surround the battery box and the battery mount, and the area of the floor to which the battery mount is attached is stiffened. In addition, the battery stand, the battery box, the battery stored in the battery box, and the like are protected against external forces from above, in the front-rear direction, and from the side.
[0014]
According to a second aspect of the present invention, in the vehicle battery mounting structure according to the first aspect, the battery mounting portion includes a front frame and a rear frame that extend in the vehicle width direction and are arranged in parallel with each other, and a front-rear direction. And a pair of side frames that connect the respective side ends of the front frame and the rear frame, and a ladder-like frame that is connected between intermediate portions of the front frame and the rear frame. It has a frame structure.
[0015]
According to the invention of claim 2, the battery mounting portion is formed in a substantially rectangular shape by the front frame, the rear frame, and the both side frames, and the ladder-like frame structure in which the front frame and the rear frame are connected by the connecting frame. Since it is formed, a battery mounting portion that is lightweight and has sufficient rigidity and strength is secured. In particular, by forming the front frame, the rear frame, both side frames and the like into a substantially rectangular cross section having a light weight and a high rigidity, a battery mounting portion having a lighter weight and an excellent rigidity and strength can be secured.
[0016]
According to a third aspect of the present invention, in the vehicle battery mounting structure according to the first or second aspect, the front leg portion includes a leg main body having an upper end coupled to a front portion of the battery mounting portion, and the leg. The base part couple | bonded with the lower end of a part main body and the attachment surface couple | bonded with the said floor were provided with the plate-shaped attachment bracket formed continuously via the bending part.
[0017]
According to the invention of claim 3, the lower end portion of the leg main body, the upper end of which is connected to the battery mounting portion, is simply connected to the floor via the plate-like mounting bracket formed by bending the bent portion. A weak part can be formed in a front leg part by composition.
[0018]
According to a fourth aspect of the present invention, in the vehicle battery mounting structure according to any one of the first to third aspects, the rear leg portion includes a base portion coupled to the rear portion of the battery mounting portion and a mounting surface coupled to the floor. It is the plate shape continuously formed through the bending part, It is characterized by the above-mentioned.
[0019]
According to the fourth aspect of the present invention, a relatively fragile rear leg portion can be easily formed by a simple plate-like structure in which the base portion and the mounting surface are formed by being bent through the bent portion.
[0020]
According to a fifth aspect of the present invention, in the vehicle battery mounting structure according to any one of the first to fourth aspects, the front leg portion is disposed to face the lower inner surface of the side door so as to prevent the side door from entering the vehicle interior. It is characterized by including a door stopper to be regulated.
[0021]
According to the invention of claim 5, since the door stopper is formed on the front leg portion, the side door is received by the door stopper when an impact load of a predetermined level or more is applied from the outside of the side door, that is, from the side of the vehicle body. Thus, the side door is prevented from entering the vehicle interior, ensuring safety in the vehicle interior, protecting the battery box and the battery box from the side door intrusion, and avoiding damage to the battery box and the battery in the battery box. The
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a vehicle battery mounting structure according to the present invention will be described with reference to FIGS. 1 to 4, taking a two-box type vehicle as an example. The arrow F indicates the front direction of the vehicle body.
[0027]
FIG. 1 is a side view of the main part of the rear part of the vehicle body showing the outline of the present embodiment, FIG. 2 is a perspective view of the main part showing the mounting structure of the battery box, and FIG. 3 is an exploded perspective view showing the outline of the mounting structure of the rear seat. It is.
[0028]
Reference numeral 1 in the figure denotes a rear part of an electric vehicle or a hybrid vehicle driven by using an engine and an electric motor together.
[0029]
The floor 2 of the vehicle body rear part 1 is continuously formed with a low floor part 2a, a step part 2b that continuously inclines behind the low floor part 2a, and a high floor part 2c that is formed behind the step part 2b. .
[0030]
A battery mount 20 on which the battery box 10 is mounted is placed between the low floor portion 2a of the floor 2 and the front portion of the high floor portion 2c, and a rear seat 30 is disposed so as to cover the upper side of the battery box 10, and the rear seat 30 A trunk space 5 is formed behind the vehicle.
[0031]
As shown in FIGS. 1 and 2, the battery box 10 is made of a resin-made substantially rectangular bottom surface portion 11a and a front wall 11b, a rear wall 11c, and both side walls 11d, 11e that are erected along the outer periphery of the bottom surface portion 11a. It is formed by a box-shaped box body 11 having an open upper portion made of a peripheral wall and a sheet metal cover 12 that closes the upper side of the opening box body 11. In the battery box 10, electric power for driving is supplied to the electric motor. A plurality of batteries and the like (not shown) are stored. In addition, the lower ends of both side walls 11d and 11e of the box body 11 are formed to hang downward from the bottom surface portion 11a so as to cover the side of the battery mounting portion 21 of the battery mount 20 described later.
[0032]
The battery mount 20 that supports the battery box 10 includes a rectangular battery mounting portion 21 that substantially follows the planar shape of the bottom surface portion 11 of the battery box 10, and a front portion of the battery mounting portion 21 on the low floor portion 2 a of the floor 2. A pair of front leg portions 22 to be attached and supported and a rear portion of the battery mounting portion 21 to have a pair of rear leg portions 23 and a rear leg portion 24 to attach and support the rear portion of the battery mounting portion 21 to the front portion of the high floor portion 2c.
[0033]
The battery mounting portion 21 includes a front frame 21a and a rear frame 21b that extend in the vehicle width direction and are arranged in parallel with each other, and each of the front frame 21a and the rear frame 21b that extend in the front-rear direction. A plate-like shape that is formed in a substantially rectangular shape by a pair of side frames 21c and 21d that are formed in a substantially rectangular cross section that joins the side ends to each other, and that extends in the front-rear direction between the intermediate portions of the front frame 21a and the rear frame 21b. The connecting frame 21e is constructed.
[0034]
The front legs 22 are respectively coupled to the vicinity of the front ends of the side frames 21c and 21d. Each front leg 22 is coupled to the lower ends of the support legs 22b and the support legs 22b having a rectangular cross section that is coupled to the side frames 21c and 21d and is inclined to the side of the vehicle body. A base portion is coupled to the front surface of the support portion 22c and a substantially L-shaped leg portion main body 22a composed of a support portion 22c having a rectangular section extending in the direction and placed on the low floor portion 2a. A mounting surface continuously formed forward through a bent portion extending in the width direction at the lower end is formed on the low floor portion 2a and bent into a substantially L shape that is bolted to the low floor portion 2a. A plate-shaped mounting bracket 22d is provided.
[0035]
Further, at the upper surface side end of the support portion 22 c of the front leg portion 22, the side door 6 faces the lower inner surface of the side door 6 provided on the side surface of the vehicle body rear portion 1, that is, the lower inner surface of the inner panel of the door 6. A door stopper 22e for preventing door intrusion is provided to come into contact with the side door 6 and prevent the side door 6 from entering the vehicle interior when an impact load is applied from the outside.
[0036]
The rear leg portion 23 is a plate that is bent in a substantially L shape in which a base portion 23a is coupled to each rear end portion of the rear frame 21b and a mounting surface 23b is bolted to the front portion of the high floor portion 2c. It is a member. On the other hand, the rear leg portion 24 is bent in a substantially L shape in which the mounting surface 24b branched when the base portion 24a is joined to the center portion of the rear surface of the rear frame 21b is bolted to the center portion of the front portion of the high floor portion 2c. Formed by the plate member.
[0037]
The battery mount 20 thus formed has a battery mounting portion 21 that is formed into a substantially rectangular shape by a front frame 21a, a rear frame 21b, and side frames 21c and 21d having a substantially rectangular cross section having rigidity, and the front frame. 21a and the rear frame 21b are formed by a so-called ladder-like frame structure in which the connecting frame 21e is joined, so that the lower end of the front leg portion 22 is substantially L-shaped while being lightweight and having sufficient rigidity and strength. The rear leg 23 is bolted to the low floor portion 22a so as to be relatively fragile to the load in the front-rear direction and is joined to the rear frame 21b and the high floor portion 2c. And 24 are relatively weakly formed by a simple L-shaped structure.
[0038]
As shown in FIGS. 1 and 3, the rear seat 30 is located above the battery box 10 and covers the upper part of the battery box 10 with a gap therebetween, a front frame 32a, a rear frame 32b, both side frames 32c, 32d, A substantially rectangular seat cushion frame 32 comprising a central frame 32e that connects the central portions of the front frame 32a and the rear frame 32b, and a lower end of the seat cushion frame 32 that extends from the front end corner and bends downward. A pair of front leg portions 33 bolted to the low floor portion 2a in front of the battery mounting portion 21 and outward in the width direction, and a lower end extending from the rear end corner portion of the seat cushion frame 32 with the lower end at the rear of the battery mount 20 And a highly rigid seat support integrally formed by a pair of rear leg portions 34 bolted to the high floor portion 2c at the outer side in the width direction. It has a 31.
[0039]
The battery box 10 and the battery mounting portion 21 are surrounded and protected by the seat cushion frame 32 of the seat support portion 31 and the pair of front leg portions 33 and the pair of rear leg portions 34 extending to the seat cushion frame 32. At the same time, the area of the floor 2 to which the battery mount 20 is attached is stiffened.
[0040]
A seat cushion 35 is placed on the seat cushion frame 32 of the seat support portion 31, and a backrest 37 is bolted to the rear portion of the seat cushion frame 32 via a seat bracket 36.
[0041]
Next, the effect | action by the mounting structure of the vehicle battery comprised in this way is demonstrated with reference to the effect | action explanatory drawing shown in FIG.
[0042]
While the battery box 10 and the battery mount 20 are surrounded and protected by the seat cushion frame 32 of the seat support portion 31 and the pair of front leg portions 33 and the pair of rear leg portions 34 extending to the seat cushion frame 32, Since the region of the floor 2 to which the battery mount 20 is attached is stiffened, the battery box 10 and the battery stored in the battery box 10 are protected against external forces from above, the front-rear direction, and the side, Since the battery box 10 is accommodated below the rear seat 30, an effective capacity of the trunk space 5 formed on the high floor portion 2c is secured.
[0043]
On the other hand, since the components constituting the rear suspension that can sufficiently withstand vibrations and shocks during running are strong and highly rigid, in the normal state shown in FIG. When the above impact load P is applied, the rear part of the vehicle body is deformed and the rear wheel is pushed forward, etc., causing the vehicle body frame to which the rear suspension is attached to rise, and as shown in FIG. The high floor portion 2c forming the second trunk space 5 is crushed and deformed, and the front portion of the high floor portion 2c that rises and supports the rear legs 23 and 24 of the battery mount 20 is pushed up.
[0044]
Along with the upward deformation of the front portion of the high floor portion 2c, the bent portions of the rear leg portions 23 and 24 formed relatively weakly deform, and the mounting bracket 22d formed by bending the front leg portion 22 is formed. Is bent and deformed, the increase in the rigidity of the floor 2 due to the attachment of the battery mount 20 is suppressed, and the rising and crushing deformation of the high floor portion 2c is allowed to secure the crash stroke. As a result, shock absorption due to sufficient crushing deformation is ensured, shock is mitigated, and safety is ensured.
[0045]
In addition, since the battery mounting portion 21 that is firmly formed is prevented from being deformed, deformation of the battery box 10 supported by the battery mounting portion 21 is prevented, and damage to the battery or the like stored in the battery box 10 is avoided. Is done.
[0046]
Furthermore, at the upper surface side end of the support portion 22c of the front leg portion 22, the lower inner surface of the side door 6 provided on the side surface of the rear portion 1 of the vehicle body, that is, the lower inner surface of the inner panel of the door 6 is provided to prevent the door from entering. Since the door stopper 22e is formed, the side door 6 is received by the door stopper 22e when an impact load of a predetermined level or more is applied from the outside of the side door 6, in other words, from the side of the vehicle body. Is prevented to ensure the safety of the vehicle interior, protect the battery box 10 and the battery box 10 from the intrusion of the side door 6, and avoid damage to the battery box 10 and the battery.
[0047]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above embodiment, the front leg 22 and the rear leg are compared with the battery mounting portion 21 by forming the mounting bracket 22d and the rear legs 23 and 24 of the front leg 22 in a substantially L shape. Although the portions 23 and 24 are formed to be fragile, the front leg portion 22 and the rear leg portions 23 and 24 may be configured to be fragile with respect to the battery mounting portion 21 by appropriate means such as changing the cross-sectional shape.
[0048]
Further, the shape of the front frame 21a, the rear frame 21b, the side frames 21c and 21d, and the connection frame 21e of the battery mounting portion 21 is changed according to the shape of the battery box 10 and the required strength of the battery mount 20, or the connection frame 21e. Can be increased or omitted, and the rear leg 24 can be omitted or the shapes of the front leg 22 and the rear legs 23 and 24 can be changed as appropriate.
[0049]
Furthermore, in the above-described embodiment, a so-called two-box type vehicle having a trunk space at the rear part of the passenger compartment has been described, but the present invention can also be applied to a vehicle having a trunk room independent from the passenger compartment.
[0050]
【The invention's effect】
According to the vehicle battery mounting structure of the present invention described above, the battery mount on which the battery box that is disposed on the floor at the rear of the vehicle body and stores the battery is mounted, the battery mounting portion that supports the battery box, and the battery From the front leg that supports the front part of the mounting part and the rear leg part that supports the rear part of the battery mounting part, the front leg part and the rear leg part are made fragile to the battery mount. When an impact load of a predetermined level or more is applied to the vehicle body portion from the rear of the vehicle body, the front leg portion and the rear leg portion are deformed, thereby suppressing an increase in the rigidity of the floor due to the battery mount. Allowed crash stroke is ensured and sufficient shock absorption is obtained to ensure safety, while deformation of the strongly formed battery mounting portion is avoided. Supported battery box and damage such as the battery stored in the battery box Teri mounting portion is avoided.
[0051]
In addition, by arranging the battery box and the battery stand below the rear seat, an effective capacity of a trunk space or a trunk room arranged on the floor behind the rear seat is secured, and the portion is effectively used as a crash stroke. Can act.
[0052]
Further, the seat support portion of the rear seat is disposed above the battery box, and is laid between the seat cushion frame and the front corners of the seat cushion frame and the floor in front of the battery box and the battery mount and outside the width. By forming a pair of front legs and a pair of rear legs installed between the rear corners of the seat cushion frame and the floor at the rear of the battery box and the battery mount and outside the width, The battery mount, the battery box, the battery stored in the battery box, and the like are protected against external forces from above, in the front-rear direction, and from the side.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part of a rear part of a vehicle body showing an outline of an embodiment of a mounting structure for a vehicle battery box according to the present invention.
FIG. 2 is an exploded perspective view showing an outline of a battery box mounting structure.
FIG. 3 is an exploded perspective view showing an outline of a rear seat mounting structure, similarly;
4A and 4B are operation explanatory views, in which FIG. 4A shows an outline of a normal state before the action of an impact load, and FIG. 4B shows an outline of a deformation state of the rear part of the vehicle body due to the action of the impact load. It is.
FIG. 5 is a cross-sectional view of a main part showing a conventional battery mounting structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle body rear part 2 Floor 5 Trunk space 6 Side door 10 Battery box 11 Box main body 12 Cover 20 Battery mount 21 Battery mounting part 21a Front frame 21b Rear frame 21c Side frame 21d Side frame 21e Connection frame 22 Front leg part 22a Leg body 22d Mounting bracket 22e Door stopper 23 Rear leg portion 23a Base portion 23b Mounting surface 24 Rear leg portion 24a Base portion 24b Mounting surface 30 Rear seat 31 Seat support portion 32 Seat cushion frame 31 Seat support portion 33 Front leg portion 34 Rear leg portion 35 Seat Cushion P Impact load

Claims (5)

In the vehicle battery mounting structure in which the battery box (10) for storing the battery is mounted on the battery stand (20) disposed on the floor (2 ) in the rear part (1) of the vehicle body,
The battery mount (20)
A battery mounting portion (21) for supporting the battery box (10) ;
A front leg (22) that is installed between the front part of the battery mounting part (21) and the floor (2) and supports the front part of the battery mounting part (21) ;
A rear leg (23) provided between the rear part of the battery mounting part (21) and the floor (2) to support the rear part of the battery mounting part (21) ;
The front leg portion (22) and the rear leg portion (23) are formed to be weak with respect to the battery mounting portion (21) ,
The battery box (10) and the battery mount (20) are disposed between the floor (2) and the rear seat (30),
The rear seat (30)
A substantially rectangular seat cushion frame (32) disposed above the battery box (10) and supporting the seat cushion (35);
A pair of front legs (33) installed between the front end corners of the seat cushion frame (32) and the floor (2) in front of the battery box (10) and the battery mount (20) and outward in the width; ,
A pair of rear legs (34) installed between the rear end corners of the seat cushion frame (32) and the floor (2) behind the battery box (10) and the battery mount (20) and outside the width. The vehicle battery mounting structure is provided with a seat support portion (31) including The battery mounting portion (21)
A front frame (21a) and a rear frame (21b) extending in the vehicle width direction and arranged in parallel to each other;
A pair of side frames (21c) extending in the front-rear direction and connecting the side ends of the front frame (21a) and the rear frame (21b) ;
The vehicular vehicle according to claim 1, characterized in that it has a ladder-like frame structure including a connecting frame (21e) erected between intermediate portions of the front frame (21a) and the rear frame (21b) . Battery mounting structure. The front leg (22)
A leg body (22a) having an upper end coupled to the front of the battery mounting section (21) ;
Leg body (22a) the lower end coupled to the base portion (23a) and the floor (2) coupled to the mounting surface (22b) and is continuously formed through the bent portion a plate-shaped mounting bracket ( The vehicle battery mounting structure according to claim 1 or 2, further comprising: 22d) . The rear leg (23)
A base part (23a) coupled to the rear part of the battery mounting part (21) and a mounting surface (23b) coupled to the floor (2) are formed in a plate shape continuously formed via a bent part. The vehicle battery mounting structure according to any one of claims 1 to 3. The front leg (22)
One is opposed to the lower inner surface of the side door (6) according to claim 1, characterized in that with the door stopper (22e) for restricting the intrusion into the passenger compartment of the side door (6) 1 The vehicle battery mounting structure according to the item .

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