JP2023003548A - Vehicle mounting structure of battery pack - Google Patents

Abstract

To provide a vehicle mounting structure of a battery pack capable of preventing the contact of battery modules.SOLUTION: A battery pack 1 has a first battery module 5 and a second battery module 6 which are arranged side by side. Between the first battery module 5 and the second battery module 6, a first gap 8 is formed. A first underbracket 31 is arranged under the first battery module 5. A second underbracket 32 is arranged under the second battery module 6. Between the first under bracket 5 and the second under bracket 6, a second gap 33 is formed. The second gap 33 is arranged immediately under the first gap 8.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a vehicle mounting structure for a battery pack.

Japanese Patent No. 4178986 (Patent Document 1) discloses a battery pack mounted on a vehicle. The battery pack is mounted below the rear seat. A battery pack is composed of a plurality of modules, and each module is composed of a plurality of cells.

Patent No. 4178986

In the battery pack described in the above document, a plurality of battery modules are arranged side by side. When a load is input from the side of the battery pack, there is a risk that the battery module will come into contact with the adjacent battery module.

The present disclosure proposes a vehicle mounting structure for a battery pack that can suppress contact between battery modules.

The battery pack has a first battery module and a second battery module arranged side by side. A first gap is formed between the first battery module and the second battery module. A vehicle mounting structure for a battery pack according to the present disclosure includes a rear bracket arranged on the vehicle rear side with respect to the battery pack, a front bracket arranged on the vehicle front side with respect to the battery pack, and a first battery module. and a second under bracket arranged below the second battery module. The first under bracket is fixed to the front bracket. A second under bracket is fixed to the rear bracket. A second gap is formed between the first underbracket and the second underbracket. The second gap is arranged directly below the first gap.

When a load is applied from the side of the battery pack, the formation of the second gap bends the bottom surface of the battery pack downward between the first under bracket and the second under bracket. At this time, the first battery module and the second battery module move obliquely downward relative to each other, thereby avoiding contact between the first battery module and the second battery module.

According to the vehicle mounting structure of the battery pack according to the present disclosure, contact between the battery modules can be suppressed.

It is a mimetic diagram showing a schematic structure of vehicle mounting structure of a battery pack concerning an embodiment. FIG. 4 is a schematic diagram showing behavior when a load is applied to the battery pack; FIG. 4 is a schematic diagram showing movement of the battery module;

Embodiments will be described below with reference to the drawings. In the following description, the same reference numerals are given to the same parts. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

FIG. 1 is a schematic diagram showing a schematic configuration of a vehicle mounting structure for a battery pack 1 according to the embodiment. A battery pack 1 according to the embodiment is mounted in a vehicle. The vehicle is a hybrid vehicle that can run using power of at least one of a motor and an engine, or an electric vehicle that runs with driving force obtained from electric energy.

The direction of arrow Fr shown in FIG. 1 corresponds to the forward direction of the vehicle, and the opposite direction corresponds to the backward direction of the vehicle. The arrow UPR direction shown in FIG. 1 corresponds to the upward direction, and the opposite direction corresponds to the downward direction. In FIG. 1, the left-right direction in the figure is the front-rear direction of the vehicle, the up-down direction in the figure is the up-down direction of the vehicle, and the vertical direction of the paper is the left-right direction (width direction) of the vehicle.

As shown in FIG. 1 , battery pack 1 includes upper case 2 and lower case 3 . An upper case 2 that opens downward and a lower case 3 that opens upward are combined to form a substantially rectangular box-like outer shape of the battery pack 1 . In FIG. 1 and subsequent FIG. 2, the ceiling plate, bottom wall, and side walls of the battery pack 1 are illustrated as being flat, but they may have a shape having depressions or protrusions.

A first battery module 5 and a second battery module 6 are accommodated in the battery pack 1 . The upper case 2 covers the first battery module 5 and the second battery module 6 from above. Lower case 3 is arranged below first battery module 5 and second battery module 6 . Lower case 3 accommodates at least lower portions of first battery module 5 and second battery module 6 .

The first battery module 5 and the second battery module 6 are arranged side by side in the longitudinal direction of the vehicle. The first battery module 5 and the second battery module 6 are arranged laterally next to each other. A first gap 8 is formed between the first battery module 5 and the second battery module 6 . The first gap 8 is on the vehicle rear side with respect to the first battery module 5 and on the vehicle front side with respect to the second battery module 6 . The first battery module 5 and the second battery module 6 are spaced apart, and no other member or device is placed between the first battery module 5 and the second battery module 6. It is configured.

Both the first battery module 5 and the second battery module 6 have a plurality of battery cells and a pair of end plates. A plurality of battery cells are stacked in one direction (for example, the direction perpendicular to the plane of FIG. 1, i.e., the left and right direction of the vehicle), and end plates are placed at both ends of the battery cell stack, and the end plates apply a restraining load to the stack. Each battery module is formed by loading and electrically connecting each battery cell to each other via a bus bar (not shown).

The floor panel 10 is a plate-shaped metal member and forms the floor surface of the passenger compartment. The seat cushion 12 is arranged on the upper surface of the floor panel 10 . The seat cushion 12 is, for example, a seat cushion for a second row seat provided in the passenger compartment.

A front cross member 14 is fixed to the lower surface of the floor panel 10 at the corner where the floor panel 10 bends from the mounting surface of the seat cushion 12 and extends downward. A rear cross member 16 is fixed to the lower surface of the floor panel 10 at a position behind the vehicle with respect to the front cross member 14 . The front cross member 14 and the rear cross member 16 extend in the lateral direction of the vehicle. The front cross member 14 and the rear cross member 16 are spaced apart in the longitudinal direction of the vehicle and extend substantially parallel.

Battery pack 1 is arranged below floor panel 10 . Battery pack 1 is arranged below seat cushion 12 . Battery pack 1 is arranged behind front cross member 14 . Battery pack 1 is arranged in front of rear cross member 16 .

The front bracket 21 is arranged on the front side of the vehicle with respect to the battery pack 1 . The front bracket 21 is attached to the front cross member 14 at a front attachment point 22 . The front bracket 21 is arranged to extend downward and rearward from the front cross member 14 . The front bracket 21 is fixed to the front cross member 14 at its upper end.

The rear bracket 25 is arranged on the vehicle rear side with respect to the battery pack 1 . The rear bracket 25 is attached to the rear cross member 16 at a rear attachment point 26 . Rear bracket 25 is arranged to extend downward and forward from rear cross member 16 . The rear bracket 25 is fixed to the rear cross member 16 at its upper end.

A reinforcement is provided on the lower surface of the battery pack 1 for the purpose of protecting the battery pack 1 against input from the road surface. The reinforcement is arranged below the lower case 3 to reinforce the lower case 3 . The reinforcement includes a first underbracket 31 and a second underbracket 32 . The first under bracket 31 is arranged below the first battery module 5 . The second under bracket 32 is arranged below the second battery module 6 . One under bracket is set directly under one battery module.

A lower end portion of the front bracket 21 extends rearward. The battery pack 1 (lower case 3) is mounted on the upper surface of the lower end portion, and the first under bracket 31 is attached to the lower surface. The bottom surface of the battery pack 1 (lower case 3), the front bracket 21, and the first under bracket 31 are joined together at the front joint portion 35, so that the joint point between the battery pack 1 and the front bracket 21 is deformed. is suppressed. The first under bracket 31 is fixed to the front bracket 21 at its edge on the front side of the vehicle.

A lower end portion of the rear bracket 25 extends forward. A second under bracket 32 is attached to the upper surface of the lower end portion. A battery pack 1 (lower case 3 ) is mounted on the upper surface of the second under bracket 32 . The bottom surface of the battery pack 1 (lower case 3), the rear bracket 25, and the second under bracket 32 are joined at the rear joint portion 36, so that the joint point between the battery pack 1 and the rear bracket 25 is deformed. is suppressed. The second under bracket 32 is fixed to the rear bracket 25 at its edge on the vehicle rear side.

The first under bracket 31 is joined to the bottom surface of the battery pack 1 (lower case 3) at a first intermediate joint portion 38 on the edge on the vehicle rear side. The second under bracket 32 is joined to the bottom surface of the battery pack 1 (lower case 3) at a second intermediate joint portion 39 on the vehicle front side edge thereof.

First underbracket 31 and second underbracket 32 have a thickness greater than the bottom surface of battery pack 1 (lower case 3). First under bracket 31 and second under bracket 32 have higher rigidity than the bottom surface of battery pack 1 (lower case 3).

The bottom surface of battery pack 1 (lower case 3 ) is supported by the lower end of front bracket 21 , the lower end of rear bracket 25 , first under bracket 31 and second under bracket 32 . Battery pack 1 is supported by floor panel 10 via first under bracket 31 , front bracket 21 and front cross member 14 . Battery pack 1 is supported by floor panel 10 via second under bracket 32 , rear bracket 25 and rear cross member 16 .

The first under bracket 31 and the second under bracket 32 are spaced apart in the longitudinal direction of the vehicle. The first under bracket 31 and the second under bracket 32 are separated from each other. The first under bracket 31 is arranged directly below the first battery module 5 . The second under bracket 32 is arranged directly below the second battery module 6 .

A second gap 33 is formed between the first under bracket 31 and the second under bracket 32 . A second gap 33 is arranged directly below the first gap 8 between the first battery module 5 and the second battery module 6 . The position of the first gap 8 and the position of the second gap 33 in the front-rear direction match each other.

Behavior when a load is applied to the battery pack 1 of the embodiment having the above configuration will be described below. FIG. 2 is a schematic diagram showing behavior when a load is applied to the battery pack 1. As shown in FIG.

As shown in FIG. 2 , when an impact is received from the rear and a load L is applied, the rear bracket 25 and the rear cross member 16 move toward the battery pack 1 . At this time, the floor panel 10 between the front cross member 14 and the rear cross member 16 deforms downward as indicated by arrow A2, comes into contact with the battery pack 1, and exerts a downward force on the battery pack 1. may work. In addition, as indicated by arrow A1, rear bracket 25 may contact battery pack 1 from behind and exert forward force on battery pack 1 .

FIG. 3 is a schematic diagram showing movement of the first battery module 5 and the second battery module 6. As shown in FIG. As described with reference to FIG. 1, a second gap 33 is formed between the first under bracket 31 and the second under bracket 32 . Neither the first under bracket 31 nor the second under bracket 32 is provided directly below the first gap 8 between the first battery module 5 and the second battery module 6 . The bottom surface of the battery pack 1 (lower case 3 ) has the lowest rigidity immediately below the first gap 8 between the first battery module 5 and the second battery module 6 .

When the load L shown in FIG. 2 is applied from the side (in this case, the rear) of the battery pack 1 and forces shown by arrows A1 and A2 act on the battery pack 1, the bottom surface of the battery pack 1 is the most It bends downward between the first under bracket 31 and the second under bracket 32 having low rigidity. At this time, as indicated by an arrow A3 in FIG. 3, the first battery module 5 moves diagonally backward and downward, and the second battery module 6 moves diagonally forward and downward.

In this manner, the first battery module 5 and the second battery module 6 are moved obliquely downward instead of linearly in the front-rear direction. Contact with the module 6 can be suppressed.

In the configuration described in the embodiment, the battery pack 1 is mounted on the upper surface of the front bracket 21 and the first under bracket 31 is attached to the lower surface of the front bracket 21 at the front joint portion 35 . The second under bracket 32 is fixed to the upper surface of the rear bracket 25 at the rear joint portion 36 , and the battery pack 1 is mounted on the second under bracket 32 . The configuration is not limited to this configuration, and the first under bracket 31 may be fixed to the upper surface of the front bracket 21 at the front joint portion 35 so that the battery pack 1 is mounted on the first under bracket 31 . At the rear joint portion 36 , the battery pack 1 may be mounted on the upper surface of the rear bracket 25 and the second under bracket 32 may be attached to the lower surface of the rear bracket 25 .

The embodiments disclosed this time are illustrative in all respects and should be considered not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the meaning and range of equivalents of the scope of the claims.

REFERENCE SIGNS LIST 1 battery pack 2 upper case 3 lower case 5 first battery module 6 second battery module 8 first gap 10 floor panel 12 seat cushion 14 front cross member 16 rear cross member 21 front bracket 22 front attachment point 25 rear bracket 26 rear attachment point 31 first under bracket 32 second under bracket 33 second gap 35 front joint 36 rear joint 38 First Intermediate Joint, 39 Second Intermediate Joint, A1, A2, A3 Arrows, L Load.

Claims (1)

A vehicle mounting structure for a battery pack,
The battery pack has a first battery module and a second battery module arranged side by side with a first gap formed between the first battery module and the second battery module. has been
a rear bracket arranged on the rear side of the vehicle with respect to the battery pack;
a front bracket arranged on the front side of the vehicle with respect to the battery pack;
a first under bracket arranged below the first battery module;
a second under bracket arranged below the second battery module;
The first under bracket is fixed to the front bracket,
The second under bracket is fixed to the rear bracket,
A battery pack vehicle, wherein a second gap is formed between the first underbracket and the second underbracket, and the second gap is arranged immediately below the first gap. mounting structure.

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