JP3085346B2 - Battery mounting structure for electric vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery mounting structure for an electric vehicle.

[0002]

2. Description of the Related Art As a conventional battery mounting structure of an electric vehicle, for example, there is one shown in FIG. 8 (see Japanese Patent Application Laid-Open No. 52-35023).

[0003] A storage space 2 extending in the front-rear direction is formed below a floor panel 1 of an automobile, and a plurality of batteries 3 are arranged on a bottom surface of the storage space 2. An entrance 2a is formed at the front end of the storage space 2, and an exit 2b is formed at the rear end, so that the air E can pass through the storage space 2. A space 4 is provided between the battery 3 and the floor panel 1 arranged, and a fan 5 is provided at a front end of the space 4.

When the vehicle is running, air E enters through the inlet 2a, flows through the storage space 2, and exits the outlet 2a.
b, this storage space 2
The battery 3 can be cooled by the air E flowing inside.

[0005] Further, for example, during charging at the time of non-traveling such as at night, the fan 5 is rotated to send air E into the vacant space 4 in the storage space 2 and to generate heat from the battery 3 during charging. And exhaust gas from the rear outlet 2b.

[0006]

However, in such a conventional technique, the air E directly enters the storage space 2 from the inlet 2a when the vehicle is running.
If water contains water or mud droplets, the water or mud droplets may adhere to the battery 3 and cause a decrease in the performance of the battery 3.

Further, when the vehicle collides from the front, the battery 3 in the storage space 2 may move forward from the entrance 2a due to inertial force. Therefore, the structure for fixing the battery 3 needs to be particularly strong. Therefore, the fixing work is troublesome and the cost is disadvantageous.

The present invention has been made by paying attention to such a conventional technique, and can prevent water and mud splashes contained in the air from adhering to the battery, and can move the battery at the time of collision with a car. It is intended to provide a battery mounting structure for an electric vehicle, which can prevent the occurrence of a battery.

[0009]

In order to achieve the above object, a battery mounting structure for an electric vehicle according to the present invention comprises at least a pair of skeletal members spaced at predetermined intervals along a longitudinal direction of a vehicle body. A battery mounting structure for an electric vehicle that has an upper plate provided in an upper portion of a storage space between the respective frame members, a battery case in which a battery is mounted on a lower portion, and cooling of the battery by air introduced into the storage space A first horizontal member is formed on the lower surface of the upper plate, a lower plate is provided on the front side of the storage space, and the upper surface of the lower plate behind the first horizontal member has a battery case. A second horizontal member to be engaged with the front end is formed, and an upward convex portion whose upper end is higher than the lower end of the first horizontal member is formed at the front end of the battery case.

[0010]

The air introduced from the inlet formed between the front end of the upper plate and the lower plate passes through a reverse passage formed between the first horizontal member formed on the upper plate and the upwardly projecting portion of the front end of the battery case. Water and mud droplets are separated while passing through the reverse passage. Therefore, the intrusion of water and mud splashes into the storage space can be suppressed, and the performance of the battery can be prevented from deteriorating due to their adhesion.

Further, since the front end of the battery case is engaged with the second horizontal member, even if the battery attempts to move to the front side due to inertial force at the time of collision of the vehicle, the battery hits the second horizontal member and cannot move forward.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to FIGS.
It will be described based on. In addition, the description which overlaps with the related art is omitted.

Reference numeral 6 denotes an underfloor structure which constitutes a lower portion of the vehicle. Reference numeral 7 denotes a center member serving as a "skeleton member". Side members 8 and 9 also serving as "skeleton members" are disposed on both left and right sides of the center member 7, respectively. Each of the side members 8 and 9 has an outward projection 1.
Zeros are formed at the front and rear, and side sill portions 11 each having the same closed cross-sectional structure are provided between the front and rear end portions of the protrusions 10.

Between the center member 7 and each of the side members 8 and 9, there are provided an upper plate 12, a lower plate 13, and a battery case 14, which serve as "floor panels" of the vehicle compartment. A storage space 16 is defined by these and the side surfaces of the center member 7 and the side members 8 and 9. An upper plate 17 and a lower plate (not shown) are also provided between the side members 8, 9 and the side sill portion 11.

Between the center member 7 and the front ends of the side members 8 and 9, a first cross member 18 as a "first horizontal member" is installed with its upper surface connected to the upper plate 12. The first cross member 18 has a closed cross-sectional structure, and the lower surface thereof is an inclined surface 18a that is lowered rearward.

The rear end 13a of the lower plate 13 is located rearward of the first cross member 18. The lower end of the lower plate 13 slightly forward of the rear end 13a and rearward of the first cross member 18. Is provided with a second cross member 20 as a "second horizontal member". An outlet 19 is formed immediately before the second cross member 20. Then, the storage space 16 from the second cross member 20 is removed.
The battery 15 on the battery mounting surface 1
The battery case 14 mounted on the battery case 4a is attached. The upper surface of the second cross member 20 is higher than the battery mounting surface 14a of the battery case 14.

The parts of the center member 7 and the side members 8, 9 to which the battery case 14 is attached are:
A plurality of inward protruding pieces 21 which are spaced at regular around d _1, respectively, are formed (see FIG. 3). On the corresponding surfaces of the center member 7 and the side members 8 and 9, a lip-shaped sealing member 22 that is continuous in the front-rear direction is provided slightly above the inwardly protruding piece 21 (FIG. 6). (See FIG. 7).

Further, between the center member 7 and the side members 8 and 9 at the rear of the storage space 16, an upper plate 1 is provided.
A third cross member 24 as a “third horizontal member” is provided with an outlet 23 at a predetermined distance from the second cross member 24. In the third cross member 24, mounting holes 25 with welding nuts are formed at two places on the left and right. An electric fan 26 is provided at an outlet 23 formed between the third cross member 24 and the upper plate 12. Is provided.

At the front end of the battery case 14 mounted in the storage space 16, an upwardly-facing upwardly convex portion 27 which is bent upward and folded is formed. Is provided with a lock portion 28 having a U-shaped cross section which is engaged with an upper portion of the second cross member 20. The upper surface of the upward projection 27 is an inclined surface 27a that rises rearward.
The upper end of is approximately the same height as the mounted battery 15,
When the battery case 14 is mounted in the storage space 16, the position is higher than the lower end of the first cross member 18. The height of the battery 15 with the battery case 14 attached is lower than the height of the upper plate 12, and a space 29 for the air E to flow is secured between the battery 15 and the upper plate 12. Has become.

The side of the battery case 14 is bent upward with a short width. By forming the side of the battery case 14 into an uneven shape, the battery case 14 can be inserted into d _{1 of the} inwardly protruding piece 21 from below. Further, a plurality of outwardly projecting pieces 31 that can be placed on the inwardly projecting piece 21 are formed. The last piece 31
Although “a” is longer than the outwardly projecting piece 31, it wraps around from the rear side onto the rearmost inwardly projecting piece 21.

Further, the rear end 32 of the battery case 14 is formed so as to rise upward, and the rear end 32 has a mounting hole 33 corresponding to the mounting hole 25 of the third cross member 24.
Are formed. An empty space 34 between the rear end 32 of the battery 15 mounted on the battery case 14 and the rear end 32 for avoiding interference with the third cross member 24 when the battery case 14 is mounted.
Is secured.

Next, the operation of the battery mounting structure according to this embodiment will be described. The operation is described in the battery case 14.
Of the battery 15, cooling of the battery 15, separation of water and mud splash e, and protection of the battery 15.

Battery case attachability:

First, the battery 1 is placed on the battery mounting surface 14a of the battery case 14 removed from the storage space 16.
Place 5 and fix. Next, the battery case 14 is placed on a dolly (not shown) and carried to the lower part of the storage space 16.
The outwardly projecting piece 31 of the battery case 14 is connected to the inwardly projecting piece 2 formed on the center member 7 and the side members 8 and 9.
The battery case 14 is moved up as it is at the interval d ₁ .

When the battery case 14 is raised, the entire battery case 14 enters the storage space 16 and the outwardly projecting piece 31 of the battery case 14 is inserted from below into the d _{1 of the} inwardly projecting piece 21 of the storage space 16. When inserted, the outwardly projecting piece 31 is positioned higher than the inwardly projecting piece 21. The battery case 14 is raised to a position higher than a regular mounting position in the storage space 16, and is moved to a position just before the upper surface of the battery 15 hits the lower surface of the upper plate 12. Thus, the lock portion 28 provided at the front end of the battery case 14 is at a position higher than the upper surface of the second cross member 20. Even if the entire battery case 14 is raised as high as above, the empty space 34 is formed between the rearmost portion of the battery 15 and the rear end 32 of the battery case 14, so that the battery 15 and the third cross The member 24 does not interfere when ascending.

Then, with the battery case 14 raised in this way, the battery case 14 is moved forward, so that the lock portion 28 is located directly above the second cross member 20 and the rear end of the battery case 14 When the abutment 32 abuts on the rear surface of the third cross member 24, the forward movement is stopped,
Next, the battery case 14 is lowered. When the battery case 14 is lowered, the lock portion 28 at the front end of the battery case 14 is engaged with the second cross member 20 from above, and the outwardly projecting piece 31 of the battery case 14 is formed.
Is placed on the rear end 13 a of the lower plate 13 and on the inwardly protruding piece 21 of the storage space 16, and the battery case 14 is temporarily fixed in the storage space 16. When the temporary fixing state is obtained, the cart (not shown) on which the battery case 14 has been mounted is removed. In this temporarily fixed state, the position of the battery case 14 is finely adjusted, and the mounting hole 33 of the rear end 32 of the battery case 14 and the mounting hole 25 of the third cross member 24 are aligned.
Fix at 5. Thus, the attachment of the battery case 14 is completed. In this embodiment, as described above, the battery case 14 can be temporarily fixed in the storage space 16 simply by lifting the battery case 14 and then moving it slightly forward, so that the mounting position of the battery case 14 can be accurately and easily determined. Positioning can be performed, and workability of mounting the battery case 14 is significantly improved.

When the battery case 14 is mounted, the lock portion 28 at the front end is engaged with the second cross member 20, and the rear end 32 is connected to the third cross member 24 with the bolt 3.
5, the battery case 14 does not move back and forth even when the vehicle is suddenly started or suddenly braked. Further, since the sealing member 22 provided on the corresponding face of the center member 7 and the side members 8, 9 are in close contact to follow the outward projection piece 31 and the interval d ₂ of the battery case 14, the water jumped from the ground Mud does not enter the storage space 16.

Battery cooling:

When the vehicle is running, the air E enters from the entrance 36 of the storage space 16, flows through the storage space 16 as it is, and exits from the outlet 23, so that the battery 15 in the storage space 16
It is cooled by the air E flowing inside. When the vehicle is running, the electric fan 26 at the outlet 23 does not need to be turned since the air E vigorously enters from the inlet 36 of the storage space 16. Then, for example, when the battery 15 is being charged at night, the air E is forced into the storage space 16 by turning the electric fan 26 to generate air E from the battery 15 during charging. Heat and gas may be discharged out of the storage space 16.

Water and mud splash separation:

At the front of the storage space 16, a first
A cross member 18 is provided, and an upwardly protruding portion 27 of the battery case 14 is located at a slightly lower rear portion thereof. The lower end of the first cross member 18 and the upper end of the upwardly protruding portion 27 are vertically aligned. Due to the overlap, an inversion passage 37 for the air E is formed between the first cross member 18 and the upwardly protruding portion 27. Therefore, the air E inserted from the inlet 36 of the storage space 16 flows straight between the upper plate 12 and the lower plate 13,
The air E that has reached the reversing passage 37 is first turned downward by the first cross member 18 and then turned upward by the upward convex portion 27, so that the air E
The water or mud splash e is separated from the air E and collides with the upward projection 27 or falls on the lower plate 13. The water or mud splash e separated from the air E and dropped downward in this way is discharged from the vehicle through the discharge port 19.

As described above, in this embodiment, the penetration of water or mud droplets e into the storage space 16 is suppressed, and these droplets e adhere to the battery 15 and the performance of the battery 15 is reduced. Can be prevented from decreasing. In this embodiment, since the lower surface of the first cross member 18 and the upper surface of the upward projection 27 are inclined surfaces 18a and 27a, respectively, along the flow of the air E, the separation performance with respect to the water or mud splash e as described above. Is obtained, but the flow velocity of the air E flowing in the storage space 16 does not decrease so much.

Battery protection:

When the vehicle collides from the front, a forward inertia energy F is generated in the battery case 14 and the battery 15 in the storage space 16 by inertia, but the lock portion 28 at the front end of the battery case 14 is A second cross member 20 is disposed at the front end of the battery case 14 and at a position where the battery mounting surface 15a is also high. The presence of the second cross member 20 causes the front of the battery 15 to move forward. Movement is reliably prevented.

In the above description, an example is described in which three center members 7 and side members 8 and 9 are formed as “skeleton members” and a battery case 19 is provided between the center member 7 and the side members 8 and 9. Although shown, the number of “skeleton members” may be two or four or more.

[0036]

The battery mounting structure of the electric vehicle according to the present invention has the contents as described above.
Air introduced from an inlet formed between the upper plate front end and the lower plate passes through a reversing passage formed between the first horizontal member joined to the upper plate and an upwardly convex portion of the battery case front end. , Water and mud splashes are separated there. Therefore, the intrusion of water or mud droplets into the storage space can be suppressed, and the performance of the battery can be prevented from deteriorating due to the attachment of these droplets.

Further, since the front end of the battery case is engaged with the second lateral member, even if the battery attempts to move forward due to inertial force at the time of collision of the vehicle, the battery hits the second lateral member and cannot move forward.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an underfloor structure of a battery mounting structure of an electric vehicle according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line SA-SA shown in FIG.

FIG. 3 is a sectional view corresponding to FIG. 2, showing a state in which a battery case is about to be mounted.

FIG. 4 is a perspective view showing a battery case on which a battery is mounted.

FIG. 5 is a perspective view from below showing a storage space showing a state where a battery case is to be mounted.

FIG. 6 is a sectional view taken along line SB-SB shown in FIG.

FIG. 7 is a sectional view taken along the line SC-SC shown in FIG.

FIG. 8 is a cross-sectional view of a vehicle showing a battery mounting structure of a conventional electric vehicle.

[Explanation of symbols]

7 center member (frame member) 8, 9 side member (frame member) 12 upper plate 13 lower plate 14 battery case 14a battery mounting surface 15 battery 16 storage space 18 first cross member (first horizontal member) 19 discharge port 20 2nd cross member (2nd horizontal member) 21 inward projection piece 22 seal member 23 outlet 24 3rd cross member (3rd horizontal member) 26 electric fan 27 upward convex part 28 lock part 29 void 31 outward projection piece E Air d ₁ Spacing between inwardly projecting pieces

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60K 1/04 B60R 16/04 H01M 2/10 B62D 25/20

Claims (9)

(57) [Claims] At least a pair of skeletal members are provided at predetermined intervals along a front-rear direction of a vehicle body, an upper plate is provided at an upper portion of a storage space between the respective skeletal members, and a battery is mounted at a lower portion. A battery mounting structure for an electric vehicle that cools the battery with air introduced into the storage space by mounting the battery case, wherein a first horizontal member is formed on a lower surface of the upper plate, and a front side of the storage space is provided. A lower plate is provided, and a second horizontal member to which a front end of the battery case is engaged is formed on an upper surface of the lower plate behind the first horizontal member, and a front end of the battery case has a first upper end. A battery mounting structure for an electric vehicle, wherein an upward convex portion higher than a lower end of the horizontal member is formed. 2. The battery mounting structure for an electric vehicle according to claim 1, wherein the lower surface of the first horizontal member is an inclined surface inclined downward toward the rear. 3. The battery mounting structure for an electric vehicle according to claim 1, wherein an upper surface of the projection of the upward projection is an inclined surface inclined upward rearward. 4. The battery according to claim 1, wherein the second horizontal member is located at a position higher than the battery mounting surface of the battery case, and a third horizontal member to which a rear end of the battery case is attached is formed behind the storage space. The battery mounting structure for an electric vehicle according to any one of claims 1 to 3. 5. An air outlet is provided between the third horizontal member and the upper plate.
Form and attach battery case to storage space
The battery placed on the battery case
Ensuring that there is a predetermined space for air to flow at the top of the
The battery mounting structure for an electric vehicle according to claim 4. 6. A protrusion formed between a third horizontal member and an upper plate.
6. The electric vehicle according to claim 5, wherein an electric fan is provided at a mouth.
Battery mounting structure for motor vehicles. 7. The lower plate according to claim 1, wherein a discharge port for discharging water or mud splashed from the air to the outside of the storage space is formed at a position forward of the second horizontal member . Izu
2. The battery mounting structure for an electric vehicle according to claim 1 . 8. A plurality of inwardly projecting pieces which are spaced apart from each other at predetermined intervals in the longitudinal direction from each skeletal member at a position corresponding to the battery case, and the inwardly projecting pieces are formed from the side of the battery case. The battery mounting structure for an electric vehicle according to any one of claims 1 to 7, wherein a plurality of outwardly projecting pieces that can be inserted from below into the space and that can be placed on the inwardly projecting pieces are formed. 9. The battery according to claim 1, wherein a seal member is provided at an opposing portion of the skeletal member to abut against a side portion of the battery case.
The battery mounting structure for an electric vehicle according to any one of claims 1 to 8.