Battery pack

Abstract

To provide a battery pack that can reduce the risk of not being able to secure a collision stroke.SOLUTION: A battery pack 10 according to the present disclosure is mounted on a vehicle. The battery pack 10 includes a housing case 1, a plurality of first cross members 3 extending in the vehicle width direction, a second cross member 5 extending in the vehicle front-rear direction, a battery module 2, and a bracket 4. The battery module 2, the second cross member 5, and the bracket 4 are arranged between the plurality of first cross members 3, and the second cross member 5 is spaced apart from the battery module 2 in the vehicle width direction. The bracket 4 is arranged between the second cross member 5 and the battery module 2. The battery module 2 is attached to the housing case 1 via the bracket 4. The bracket 4 includes a bead 4a that protrudes outward in the vehicle width direction. The second cross member 5 includes a bead 5a that protrudes inward in the vehicle width direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a battery pack.

Background Art

[0002] The mounting structure of the battery pack disclosed in Patent Document 1 includes a bus bar and a shock absorber. The bus bar is housed inside the housing case, and the shock absorber is disposed outside the housing case. The shock absorber is arranged such that when the shock absorber is projected horizontally toward the side of the battery pack, the projected image of the shock absorber formed by the projection does not overlap the bus bar. The mounting bracket attaches a plurality of battery stacks to the housing case. The reinforcing bracket reinforces the attachment to the bottom wall or the peripheral wall of the battery stack.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application have discovered the following technical problems. In such a mounting structure of a battery pack, the battery pack may be subjected to an impact from its side. In such a case, the shock absorber is displaced toward the battery stack while being crushed, and a load can be applied to the peripheral wall of the housing case and the reinforcing bracket. The housing case and the reinforcing bracket can be deformed by receiving the load. However, the housing case and the reinforcing bracket each perform another function without ensuring a collision stroke, and may hardly contribute to the collision stroke in the battery pack. Therefore, there was a risk that a collision stroke could not be ensured.

[0005] The present disclosure has been made in view of the above-described problems, and provides a battery pack capable of suppressing the risk of not ensuring a collision stroke.

Means for Solving the Problems

[0006] The battery pack according to the present disclosure is a battery pack mounted on a vehicle, a housing case, a plurality of first cross members extending in the width direction of the vehicle, a second cross member extending in the longitudinal direction of the vehicle, a battery module, a bracket, and a bead, and the battery module, the second cross member, and the bracket are disposed between the plurality of first cross members, the second cross member is spaced apart from the battery module in the width direction of the vehicle, the bracket is disposed between the second cross member and the battery module, the battery module is attached to the housing case via the bracket, the bracket includes a bead protruding outward in the width direction of the vehicle, the second cross member includes a bead protruding inward in the width direction of the vehicle, the bead of the bracket and the bead of the second cross member face each other with a predetermined interval from the center between the plurality of first cross members.

[0007] In the above-described battery pack, the bracket includes a recess recessed in the width direction of the vehicle, the recess of the bracket may be disposed at the center between the plurality of first cross members in the bracket.

[0008] In the above-described battery pack, The second cross member includes a recess that is recessed in the vehicle width direction. The recess of the second cross member may be disposed at the center between the plurality of first cross members in the second cross member.

Advantages of the Invention

[0009] According to the present disclosure, it is possible to suppress the risk of not being able to secure the collision stroke.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0011] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are appropriately simplified.

[0012] <Embodiment 1> Embodiment 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a top view of a battery pack according to the present disclosure. FIG. 2 is an enlarged top view of a main part (portion II) of the battery pack shown in FIG. 1. FIG. 3 is an enlarged perspective view of a main part of the battery pack shown in FIG. 1. In FIG. 3, the illustration of the battery module 2 is omitted.

[0013] Incidentally, as a matter of course, the three-dimensional coordinates shown in FIG. 1 and other drawings are for convenience in explaining the positional relationship of the components. Normally, in the drawings, the positive direction of the UP axis is above the vehicle (not shown), the positive direction of the FR axis is in front of the vehicle, the positive direction of the RH axis is on the right side of the vehicle, and these are common among the drawings. Also, the FR axis extends in the longitudinal direction of the vehicle, and the RH axis extends in the width direction of the vehicle.

[0014] As shown in FIG. 1, the battery pack 10 includes a housing case 1, a battery module 2, a plurality of first cross members 3, a bracket 4, and a second cross member 5. The battery pack 10 is mounted on a vehicle (not shown). The vehicle is a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, an electric vehicle, or the like. The battery pack 10 may include a plurality of battery modules 2, brackets 4, and second cross members 5.

[0015] The housing case 1 houses the battery module 2, the plurality of first cross members 3, the bracket 4, and the second cross member 5.

[0016] The battery module 2, the plurality of first cross members 3, the bracket 4, and the second cross member 5 are arranged on the bottom surface 1a of the housing case 1 shown in FIG. 3. The battery module 2, the second cross member 5, and the bracket 4 are arranged between the plurality of first cross members 3. The battery module 2 is, for example, a lithium ion battery or the like.

[0017] The plurality of first cross members 3 extend in the vehicle width direction described above. An example of the plurality of first cross members 3 shown in FIGS. 1 and 2 extends in the RH axis direction. The second cross member 5 extends in the vehicle width direction. An example of the second cross member 5 shown in FIGS. 1 and 2 extends in the FR axis direction. The second cross member 5 is disposed at a position spaced apart from the battery module 2 in the vehicle width direction. The plurality of first cross members 3 and the second cross member 5 are mechanically connected. The plurality of first cross members 3 may be mechanically connected to the second cross member 5 via a member 6. The plurality of first cross members 3 and the plurality of second cross members 5 mechanically connected in this way may form a ladder-like body.

[0018] As shown in FIG. 2, the bracket 4 is disposed between the second cross member 5 and the battery module 2. The battery module 2 is attached to the bottom surface 1a of the housing case 1 shown in FIG. 3 via the bracket 4. The bracket 4 includes a bead 4a that protrudes outward in the vehicle width direction described above. An example of the bead 4a shown in FIGS. 2 and 3 protrudes in the negative RH axis direction.

[0019] The second cross member 5 extends in the longitudinal direction of the vehicle. The second cross member 5 is disposed at a position spaced apart from the battery module 2 in the vehicle width direction. The second cross member 5 includes a bead 5a that protrudes inward in the vehicle width direction. An example of the bead 5a shown in FIGS. 2 and 3 protrudes in the positive RH axis direction.

[0020] The bead 4a of the bracket 4 and the bead 5a of the second cross member 5 face each other. Also, the bead 4a of the bracket 4 and the bead 5a of the second cross member 5 are spaced apart from the center between the plurality of first cross members 3 by a predetermined interval.

[0021] The bracket 4 includes a recess 4b that is recessed in the vehicle width direction. The recess 4b is disposed at the center between a plurality of first cross members 3 in the bracket 4. An example of the recess 4b shown in FIGS. 2 and 3 is disposed on a center line CL that extends at the center between a plurality of first cross members 3.

[0022] The second cross member 5 includes a recess 5b that is recessed in the vehicle width direction. The recess 5b is disposed at the center between a plurality of first cross members 3 in the second cross member 5. An example of the recess 5b shown in FIGS. 2 and 3 is disposed on the center line CL.

[0023] Here, when the battery pack 10 is mounted on the vehicle and the battery pack 10 receives an impact from its side, the second cross member 5 receives a load and distributes the load to the plurality of first cross members 3. The second cross member 5 bends toward the battery module 2 side. A bead 5a of the second cross member 5 abuts against a bead 4a of the bracket 4. The bead 5a and the bead 4a are compressed and deformed in the vehicle width direction. The battery pack 10 can secure a collision stroke for a length corresponding to the vehicle width direction of the bead 5a and the bead 4a. Therefore, a certain collision stroke can be imparted to the battery pack 10. That is, the possibility of not being able to secure a collision stroke can be suppressed.

[0024] Further, the load received by the second cross member 5 tends to be the largest at the center between a plurality of first cross members 3 in the second cross member 5. The bracket 4 according to the present embodiment includes a recess 4b that is recessed in the vehicle width direction. The recess 4b is disposed at the center between a plurality of first cross members 3 in the bracket 4. Thereby, a gap between the bracket 4 and the second cross member 5 can be secured at the center between a plurality of first cross members 3 in the second cross member 5 where the load received by the second cross member 5 tends to be the largest. Thereby, it is possible to contribute to ensuring a stable collision stroke.

[0025] In addition, the second cross member 5 according to the present embodiment includes a recessed portion 5b that is recessed in the vehicle width direction. The recessed portion 5b is disposed at the center between a plurality of first cross members 3 in the second cross member 5. As a result, a gap between the bracket 4 and the second cross member 5 can be secured at the center between the plurality of first cross members 3 in the second cross member 5, where the load received by the second cross member 5 tends to be the largest. This can contribute to ensuring a stable collision stroke.

[0026] Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the gist thereof. Further, the present invention may be implemented by appropriately combining the above-described embodiment and an example thereof.

Explanation of Reference Numerals

[0027] 10 Battery pack 1 Housing case 1a Bottom surface 2 Battery module 3 First cross member 4 Bracket 4a Bead 4b Recessed portion 5 Second cross member 5a Bead 5b Recessed portion 6 Member CL Center line

Claims

1. A battery pack mounted on a vehicle, comprising: a housing case; a plurality of first cross members extending in the vehicle width direction; a second cross member extending in the vehicle longitudinal direction; a battery module; a bracket, wherein the battery module, the second cross member, and the bracket are disposed between the plurality of first cross members; the second cross member is spaced apart from the battery module in the vehicle width direction; the bracket is disposed between the second cross member and the battery module; the battery module is attached to the housing case via the bracket; the bracket has a bead projecting outward in the vehicle width direction; the second cross member has a bead projecting inward in the vehicle width direction; the bead of the bracket and the bead of the second cross member face each other with a predetermined gap from the center between the plurality of first cross members; A battery pack.

2. The bracket has a recess recessed in the vehicle width direction, wherein the recess of the bracket is disposed at the center between the plurality of first cross members in the bracket; The battery pack according to claim 1.

3. The second cross member has a recess recessed in the vehicle width direction, wherein the recess of the second cross member is disposed at the center between the plurality of first cross members in the second cross member; The battery pack according to claim 1 or 2.

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