WO2022249687A1

WO2022249687A1 - Battery case for vehicle

Info

Publication number: WO2022249687A1
Application number: PCT/JP2022/013390
Authority: WO
Inventors: 光城; 陽一浅野; 伸一後藤; 貴統山本
Original assignee: 三菱自動車工業株式会社
Priority date: 2021-05-25
Filing date: 2022-03-23
Publication date: 2022-12-01
Also published as: JPWO2022249687A1

Abstract

A battery case that is mounted in a vehicle and houses a battery therein. The battery case has: a battery housing unit on both the left and the right in the vehicle width direction; a tunnel section that extends in the front/rear direction of the vehicle between the left and right battery housing units and has an open floor; first truss sections provided on the floor of the left and right battery housing units, respectively, and assembled in an X shape in the planar view; and second truss sections provided in the floor of the tunnel and assembled in an X shape in the planar view. The second truss sections are connected to both the left and right first truss sections.

Description

vehicle battery case

This invention relates to a vehicle battery case.

In vehicles with relatively large batteries such as plug-in hybrid vehicles, a battery case is often provided under the floor of the vehicle passenger compartment, and the battery module is housed in this battery case. Since the battery case itself has rigidity, it can contribute to improving the rigidity of the vehicle body. As shown in FIG. 3, a configuration has been proposed in which both ends in the vehicle width direction are directly fixed to side members of a vehicle body.

Japanese Patent Application Laid-Open No. 2013-193706

By enlarging the battery case and fixing it directly to the side members of the vehicle body as described above, the battery case can be utilized as a reinforcing member of the vehicle body. There is a possibility that the rigidity of the material itself may be lowered. In addition, since a space for passing an exhaust pipe extending from the internal combustion engine cannot be secured between the battery case and the side member of the vehicle body, a propeller shaft and a A recess (tunnel) is provided to provide a path for the exhaust pipe to pass through. However, this recess may also reduce the rigidity of the battery case.

Therefore, an object of the present invention is to prevent deterioration of the rigidity of the battery case.

In order to solve the above problems, in this invention,
A battery case mounted on a vehicle and housing a battery therein,
Battery storage units provided on the left and right sides in the vehicle width direction,
a tunnel portion with an open bottom extending in the longitudinal direction of the vehicle between the left and right battery storage portions;
a first truss portion provided at the bottom of each of the left and right battery storage portions and assembled in an X shape in a plan view;
a second truss portion provided at the bottom of the tunnel portion and assembled in an X shape in plan view,
The second truss portion is connected to each of the left and right first truss portions,
A vehicle battery case was constructed.

In the above configuration,
A plurality of the second truss portions may be arranged side by side from the front end to the rear end of the tunnel portion.

In each of the above configurations,
A plurality of the first truss portions are formed side by side in the vehicle longitudinal direction of the battery storage portion, and the rear end of the first truss portion on the front side is connected to the front end of the first truss portion on the rear side. It can be configured as

In a configuration in which a plurality of first truss parts are formed side by side,
a rear end of the first truss portion on the front side formed side by side in the longitudinal direction of the vehicle; and the front end of the first truss portion on the rear side.

In addition, in a configuration in which a plurality of first truss portions are formed side by side,
A mounting bracket for mounting the battery case to the vehicle is provided on the vehicle width direction outer side surface of the battery housing,
The mounting bracket may overlap the rear end of the first truss portion on the front side and the front end of the first truss portion on the rear side, which are formed side by side in the longitudinal direction of the vehicle, when viewed in the vehicle width direction. can.

In each of the above configurations,
Having a second partition that partitions the space in the battery storage part into the front and rear,
The second partition wall may pass through the X-shaped crossing portion of the first truss portion in plan view.

In a configuration with a second partition,
One end side of the second truss portion in the front-rear direction may be connected to the first truss portion, and the other end side in the front-rear direction may be connected to the second partition wall.

In addition, in the configuration having the second partition,
A mounting bracket for mounting the battery case to the vehicle is provided on the vehicle width direction outer side surface of the battery housing,
The mounting bracket may be provided so as to overlap with the second partition when viewed from the vehicle width direction.

In each of the above configurations,
The vehicle may be a hybrid vehicle having an internal combustion engine, and an exhaust pipe extending from the internal combustion engine toward the rear of the vehicle may be inserted through the tunnel portion.

In the present invention, the first truss portion and the second truss portion are formed on the bottom surfaces of the battery housing portion and the tunnel portion, respectively, and the first truss portion and the second truss portion are connected. A decrease in rigidity of the battery case can be prevented.

1 is a plan view showing a vehicle equipped with a vehicle battery case according to the present invention; FIG. FIG. 2 is a perspective view of the internal structure of the battery case according to the present invention, viewed obliquely from above; FIG. 3 is a perspective view of the vehicle battery case shown in FIG. 2 with a lid attached, as viewed obliquely from above and forward; FIG. 3 is a cross-sectional view taken along line IV-IV in FIG. 2; FIG. 3 is a perspective view of the vehicle battery case shown in FIG. 2 as viewed diagonally from the lower front; 3 is a bottom view of the vehicle battery case shown in FIG. 2; FIG. FIG. 3 is a perspective view of a state in which a battery module is housed in the vehicle battery case shown in FIG.

A vehicle battery case 1 (hereinafter abbreviated as battery case 1) according to the present invention will be described based on the drawings of the present application. In the following, the X direction described in each drawing is referred to as the front-rear direction, the Y direction is referred to as the vehicle width direction, and the Z direction is referred to as the height direction.

The battery case 1 is used, for example, in a hybrid vehicle such as a plug-in hybrid vehicle in which an engine as an internal combustion engine and a motor driven by a battery that can be charged from an external power source are installed together. This hybrid vehicle has a large battery case compared to a conventional vehicle driven only by an internal combustion engine. As shown in FIG. 1, the battery case 1 is often provided under the floor of the passenger compartment in consideration of the weight balance between the front and rear of the vehicle 2, the running stability, and the like.

As shown in FIG. 2, the battery case 1 has an outer frame 3 assembled in a square shape in plan view. The outer frame 3 includes a U-shaped right frame 4 arranged on the right side in the vehicle width direction, a U-shaped left frame 5 arranged on the left side in the vehicle width direction, a right frame 4 and a left frame 5 . and a connecting member 6 extending in the vehicle width direction so as to connect the front end and the rear end thereof. The insides of the right frame 4 and the left frame 5 are hollow.

The right frame 4 and the left frame 5 are provided with connecting

members

7A and 7B extending in the front-rear direction so as to connect the front and rear ends of the U-shaped frame, respectively. The connection member 6 is a member formed in a chevron shape upward from the upper surface of the outer frame 3 (the right frame 4 and the left frame 5). The connection member 6 has a connection strength that reliably connects the right frame 4 and the left frame 5, but when a very large load acts from the vehicle width direction, the connection member 6 is separated from the right frame 4 and the left frame 5 by the load. is configured as For example, the connection member 6 may be connected to the upper surface of the outer frame 3 with a pin, and the strength of the pin may be such that it will break when a very large load is applied from the vehicle width direction, such as in the event of a side collision.

Mounting brackets 8 (hereinafter referred to as 8a, 8b, 8c, 8d, and 8e in order from the front of the vehicle corresponding to their mounting locations) are provided on both outer sides of the outer frame 3 (right frame 4 and left frame 5) in the vehicle width direction. ) are arranged side by side in the longitudinal direction of the vehicle. By attaching the mounting bracket 8 to the side member 9 (see FIG. 1) of the vehicle body, the battery case 1 is fixed to the side member 9 . The frontmost mounting bracket 8 a is provided at the front end of the outer frame 3 , and the rearmost mounting bracket 8 e is provided at the rear end of the outer frame 3 . Since the front and rear ends of the outer frame 3 have higher rigidity than the intermediate portion, the

mounting brackets

8a and 8e are arranged at the front and rear ends of the outer frame 3 to firmly fix the battery case 1 to the vehicle body. In addition, it is advantageous in improving the rigidity of the vehicle body by the battery case 1, which will be described later.

As shown in FIG. 2 , the battery case 1 includes battery storage portions 10 provided on the left and right sides in the vehicle width direction, and side walls 11A and a ceiling extending in the front-rear direction of the vehicle 2 between the left and right battery storage portions 10 . 11B and a hollow tunnel portion 11 with an open bottom.

As shown in FIGS. 2, 5 and 6, the right battery storage section 10 in the vehicle width direction is a space within a framework formed by the right frame 4 and the right connecting member 7A. The battery housing portion 10 on the left side in the vehicle width direction is a space within the framework formed by the left frame 5 and the left connecting member 7B. A bottom plate 12 is provided at the bottom of each frame, and a first truss portion 13 is provided on the bottom plate 12 to form an X-shaped plan view, which will be described later. Battery modules 14 are housed in the left and right battery housing sections 10, respectively. 5 and 6, illustration of the bottom plate 12 is omitted.

As shown in FIG. 4, the tunnel portion 11 is a space between the left and right connecting

members

7A and 7B. The tunnel portion 11 is formed of a side wall 11A extending upward from the left and right connecting

members

7A and 7B, and a ceiling 11B extending in the vehicle width direction so as to connect the upper ends of the left and right side walls 11A. A bottom portion of the tunnel portion 11 is open. In this embodiment, the left and right side walls 11A and the ceiling 11B are formed by upwardly deforming the bottom plate 12 of the battery housing 10 between the left and right connecting

members

7A and 7B into a mountain shape. As shown in FIG. 1 , an exhaust pipe 16 extending rearward of the vehicle 2 from an engine 15 mounted on the front of the vehicle 2 is inserted through the tunnel portion 11 . The bottom of the tunnel portion 11 is provided with a second truss portion 17 that is assembled in an X shape in plan view, which will be described later.

Lids 18 are provided above the left and right battery storage sections 10 and the tunnel section 11 to close the upper openings of the battery storage sections 10 . The lid 18 is formed with a protrusion 19 that is formed in a mountain shape upward so as to follow the shape of the tunnel portion 11 . A gap is formed in the vertical direction between the ceiling 11B of the tunnel portion 11 and the lower surface of the lid 18 (protrusion 19).

The first truss part 13 is a steel material with a hat-shaped cross section (a shape in which outward horizontal flanges are connected to both ends of a downwardly-opening U-shaped cross section), and is welded to the bottom plate 12 . The first truss portion 13 is welded to the right frame 4 or the left frame 5 on the outside in the vehicle width direction, and welded to the connecting

member

7A or 7B on the inside in the vehicle width direction. Specifically, taking the right battery storage section 10 as an example, the first truss section 13 has a front end connected to the right frame 4 and extends rearward and inward in the vehicle width direction. 7A and a member whose front end is connected to the right connecting member 7A, which extends rearward and outward in the vehicle width direction, and whose rear end is connected to the right frame 4. ing.

A plurality of (two in this embodiment) first truss portions 13 are formed side by side in the vehicle front-rear direction of the battery housing portion 10 . The rear end of the first truss portion 13 on the front side and the front end of the first truss portion 13 on the rear side are connected to each other. The term "connection" as used herein means a state in which a load can be transmitted between the front and rear first truss portions 13, and not only a state in which the first truss portions 13 are directly connected to each other, but also a state in which the adjacent first truss portions 13 A state in which another member is interposed between the mating first truss portions 13 so that a load can be transmitted between the first truss portions 13 is also included. The front ends of the first truss portion 13 on the front side (the front ends on both the inner and outer sides in the vehicle width direction) are connected to the front corners of the square-shaped battery housing portion 10 in plan view. The ends (rear ends on the inner and outer sides in the vehicle width direction) are connected to the rear corners of the battery housing portion 10, respectively.

A square-shaped (rectangular) frame body 20 (turret) in plan view is provided at the opening of the bottom of the tunnel section 11 so as to straddle between the bottoms of the left and right battery storage sections 10 . That is, the frame bodies 20 are provided on the inner side in the vehicle width direction of the lower ends of the left and right side walls 11A of the tunnel portion 11, and connect the vertical members 20A extending in the vehicle front-rear direction along the side walls 11A and the front ends of the left and right vertical members 20A. It is formed by a first horizontal member 20B extending in the vehicle width direction so as to be connected, and a second horizontal member 20C extending in the vehicle width direction so as to connect the rear ends of the left and right vertical members 20A. A second truss portion 17 assembled in an X shape in a plan view is fixed inside the frame 20 . Thereby, the second truss portion 17 is provided at the bottom of the tunnel portion 11 . It should be noted that while the frame body 20 has a connection strength for reliably connecting the left and right battery storage sections 10 to each other, when a very large load acts from the vehicle width direction, the load causes the first horizontal member 20B and the second horizontal member 20B to move. The two lateral members 20C are configured to be broken. For example, notches may be provided in the first horizontal member 20B and the second horizontal member 20C.

A plurality (four in this embodiment) of the second truss portions 17 are formed side by side from the front end to the rear end of the tunnel portion 11 (frame body 20). The rear end of the second truss portion 17 on the front side and the front end of the second truss portion 17 on the rear side are connected to each other. In addition, in the present embodiment, the front end of the second truss portion 17 that is first counted from the front, the rear end of the second second truss portion 17 that is second (the front end of the third second truss portion 17), and 4 The rear ends of the second truss portions 17 are connected to the first truss portions 13 formed in the left and right battery storage portions 10, respectively.

Since the tunnel portion 11 has an open bottom unlike the battery storage portion 10 , the bottom side of the tunnel portion 11 communicates with the outside through the gap of the second truss portion 17 . In addition, the second truss portion 17 is configured so as to be positioned at substantially the same height direction as the first truss portion 13 (so that the end overlaps with the first truss portion 13 when viewed in the vehicle width direction). .

The numbers of the first truss portion 13 and the second truss portion 17 are not limited to this embodiment, and can be changed as appropriate. For example, a first truss portion 13 or a second truss portion 17 elongated in the front-rear direction from the front end to the rear end of the tunnel portion 11 (frame body 20) may be employed. and three second truss portions 17 may be arranged in front and rear. In this specification, the terms "front first truss section 13 (second truss section 17)" and "rear first truss section 13 (second truss section 17)" refer to the first Of the truss portions 13 (second truss portions 17), the first truss portions 13 (second truss portions 17) that are adjacent to each other are located on the front side and rear side.

Each of the left and right battery storage sections 10 is provided with a first partition wall 21 that extends in the vehicle width direction and partitions the space inside the battery storage section 10 into the front and rear. The first partition wall 21 extends from the right frame 4 to the left frame 5, and the ends in the vehicle width direction are fixed to the right frame 4 and the left frame 5, respectively. In addition, a notch through which the tunnel portion 11 is passed is provided in the middle portion of the first partition wall 21 in the vehicle width direction from the bottom end to the middle portion thereof in the vertical direction of the vehicle. The first partition wall 21 is connected to the left and right connecting

members

7A and 7B at the lower end of the notch. In addition, the connection portions between both ends of the first partition wall 21 in the vehicle width direction and the left and right connecting

members

7A and 7B are the rear end of the first truss portion 13 on the front side and the front end of the first truss portion 13 on the rear side. are connected to each other. In the present embodiment, the left and right first partitions 21 are formed as an integral member straddling the tunnel portion 11, but they can also be formed as separate members that are separated left and right.

In addition to the first partition wall 21, each battery storage portion 10 is provided with a second partition wall 22 that extends in the vehicle width direction and partitions the space inside the battery storage portion 10 into the front and rear. The second partition wall 22 passes through the X-shaped intersection of the first truss portion 13 in a plan view, and is fixed to the right frame 4 and the left frame 5 at the vehicle width direction end portions in the same manner as the first partition wall 21 . . In addition, the second partition wall 22 is provided with a notch in the same manner as the first partition wall 21, and at the lower end of the notch, the second partition wall 22 is positioned at the rear end of the third second truss portion 17 (fourth front end of the second truss portion 17).

Positions overlapping the first bulkhead 21 in the vehicle width direction (the rear end of the first truss portion 13 on the front side and the first truss portion 13 on the rear side) Mounting

brackets

8c and 8d are provided at positions overlapping the front end of one truss portion 13) and the second partition wall 22 in the vehicle width direction, respectively.

A battery module 14 is housed in the battery housing portion 10 as shown in FIG. The number, size, arrangement, etc., of the battery modules 14 shown in this figure are merely examples, and can be appropriately changed in accordance with the vehicle type and the total capacity of the battery. The battery module 14 is supported by the outer frame 3 (the right frame 4 and the left frame 5), the first partition 21, and the second partition 22. As shown in FIG. In addition, the empty space of the battery housing portion 10, the upper side of the battery module 14 housed in the battery housing portion 10 (the gap between the battery module 14 and the lid 18), and the ceiling 11B of the tunnel portion 11 and the lid 18 (protrusion). 19) accommodates various devices (not shown) such as an air conditioner module for cooling the battery module 14, electrical devices, and auxiliary devices. In each figure of the present application, description of a power cable and various pipes connected to the battery case 1 is omitted.

The battery case 1 configured as described above according to the present invention has the first truss portion 13 formed in the battery housing portion 10, the second truss portion 17 formed in the tunnel portion 11, and the width of the second truss portion 17 Since both ends in the direction are connected to the first truss portion 13 , a reduction in rigidity of the entire battery case 1 due to the tunnel portion 11 can be suppressed. In addition, the load input to one side of the battery case 1 in the vehicle width direction is transferred from the first truss portion 13 on the one side in the vehicle width direction to the second truss portion 17 and then onto the first truss portion 13 on the other side in the vehicle width direction. , and the load can be distributed over the entire battery case 1 . Further, by adopting a truss structure with many gaps instead of covering the entire bottom portion of the tunnel portion 11 with a plate or the like, weight reduction can be achieved. By fixing the battery case 1 to the side member 9 or in the vicinity of the side member 9 as in the present embodiment, the rigidity in the vertical direction (twisting direction) and the longitudinal direction (shearing direction) of the vehicle body can be increased. 1, it is possible to suppress torsion of the vehicle during running and deformation of the vehicle during a collision.

In addition, the battery case 1 configured as described above is provided with the second truss portion 17 extending from the front end to the rear end of the tunnel portion 11. In other words, the front end of the second truss portion 17 (in this embodiment, counting from the front The front end of the first second truss portion 17) is connected to the front end of the tunnel portion 11, and the rear end of the second truss portion 17 (in this embodiment, the rear end of the fourth second truss portion 17 counted from the front) is connected to the front end of the tunnel portion 11. ) is connected to the rear end of the tunnel portion 11, the rigidity of the battery case 1 in the tunnel portion 11 can be sufficiently ensured. In addition, since a plurality of second truss portions 17 are provided in the vehicle front-rear direction, compared to the case where one second truss portion 17 is provided over the tunnel portion 11 in the front-rear direction, the battery power in the tunnel portion 11 is reduced. The rigidity of the case 1 in the vehicle width direction is improved.

In addition, since the battery case 1 having the above configuration has a plurality of first truss portions 13 arranged side by side in the vehicle front-rear direction, the rigidity of the intermediate portion of the battery case 1 in the vehicle front-rear direction is improved. At this time, since the rear end of the first truss portion 13 on the front side and the front end of the first truss portion 13 on the rear side are connected, the load can be transmitted between the first truss portions 13 on the front and rear sides. 1 can be improved.

In the battery case 1 having the above configuration, the first partition wall 21 is connected to the rear end of the first truss portion 13 on the front side and the front end of the first truss portion 13 on the rear side. and the connecting

members

7A and 7B are divided into front and rear portions by the first partition wall 21, and the first truss portions 13 are provided in each of the divided frames, thereby improving the rigidity of the battery case 1. can.

In the battery case 1 having the above configuration, the second partition wall 22 passes through the X-shaped crossing portion (the point farthest from the end of the truss structure) where the reinforcing effect of the first truss portion 13 is relatively low. Therefore, the effect of strengthening the rigidity at this crossing portion is exhibited. Since the first partition 21 and the second partition 22 are existing members for partitioning the space in the battery storage section 10, there is no need to separately prepare parts for improving rigidity, and an increase in part cost is prevented. can do.

In the battery case 1 having the above configuration, the front end of the second truss portion 17, which is the third one from the front, is connected to the rear end of the first truss portion 13 on the front side, and the rear end is connected to the second partition wall 22. Therefore, the load input to one side of the battery case 1 in the vehicle width direction is applied to the first truss portion 13 and the second truss portion 17, and is applied to the other side of the battery case 1 in the vehicle width direction via the second partition wall 22. can be dispersed.

In addition, in the battery case 1 configured as described above, the mounting bracket 8c is provided corresponding to the rear end of the first truss portion 13 on the front side and the front end of the first truss portion 13 on the rear side. The load input from 8c can be distributed and transmitted to both the first truss portion 13 on the front side and the first truss portion 13 on the rear side, and deformation of the battery case 1 can be further suppressed. In addition, since the mounting bracket 8d is provided corresponding to the position of the second partition wall 22, the load input from the mounting bracket 8d is applied from one of the left and right sides in the vehicle width direction via the second partition wall 22. It can be efficiently transmitted to the other side.

In addition, in the battery case 1 configured as described above, the exhaust pipe 16 is inserted through the inside of the tunnel portion 11, but a bottom plate is not provided at the bottom portion of the tunnel portion 11. Since the exhaust pipe 16 through which high-temperature exhaust gas flows through the tunnel portion 11 passes through the exhaust pipe 16, heat is less likely to accumulate. Therefore, it is possible to prevent adverse effects on the temperature management of the battery modules 14 .

As described above, the battery case 1 has high rigidity against loads acting from the outside, but it is also assumed that the battery case 1 will be damaged when a very large load acts. In particular, if the battery storage unit 10 is damaged, the contents of the battery module 14 may scatter and cause great damage.

Therefore, in the battery case 1 having the above configuration, firstly, the outer frame 3 (the right frame 4 and the left frame 5) is made hollow, so that when the mounting bracket 8 is pushed inward strongly, this hollow It is possible to prevent deformation of the battery housing portion 10 due to the crushing of the portion. Secondly, when a very large load acts from the vehicle width direction, the connecting member 6 is configured to be disengaged from the right frame 4 and the left frame 5 by the load, and is provided at the bottom of the tunnel portion 11. In addition, since the first horizontal member 20B and the second horizontal member 20C of the frame 20 are configured to be broken, the tunnel portion 11, which does not cause a serious problem even if damaged, is preferentially crushed, while the battery storage portion 10 is preferentially crushed. damage can be prevented.

The embodiments disclosed this time should be considered illustrative in all respects and not restrictive. Therefore, 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 scope of equivalents of the scope of the claims.

This application is based on Japanese Patent Application 2021-087508 filed on May 25, 2021, the contents of which are incorporated herein by reference.

1 Vehicle battery case (battery case)
2 Vehicle 3 Outer Frame 4 Right Frame 5 Left Frame 6

Connection Members

7A, 7B Connection Members 8 (8a, 8b, 8c, 8d, 8e) Mounting Bracket 9 Side Member 10 Battery Storage Section 11 Tunnel Section 11A Side Wall 11B Ceiling 12 Bottom Plate 13 First truss portion 14 Battery module 15 Engine 16 Exhaust pipe 17 Second truss portion 18 Lid 19 Projection 20 Frame body 20A Vertical member 20B First horizontal member 20C Second horizontal member 21 First partition 22 Second partition

Claims

A battery case mounted on a vehicle and housing a battery therein,
Battery storage units provided on the left and right sides in the vehicle width direction,
a tunnel portion with an open bottom extending in the longitudinal direction of the vehicle between the left and right battery storage portions;
a first truss portion provided at the bottom of each of the left and right battery storage portions and assembled in an X shape in a plan view;
a second truss portion provided at the bottom of the tunnel portion and assembled in an X shape in plan view;
has
The second truss portion is connected to each of the left and right first truss portions,
Vehicle battery case.
A plurality of the second truss portions are formed side by side from the front end to the rear end of the tunnel portion,
The vehicle battery case according to claim 1 .
A plurality of the first truss portions are formed side by side in the vehicle longitudinal direction of the battery storage portion, and the rear end of the first truss portion on the front side is connected to the front end of the first truss portion on the rear side. ing,
The vehicle battery case according to claim 1 or 2.
a rear end of the first truss portion on the front side formed side by side in the longitudinal direction of the vehicle; and respectively connected to the front end of the first truss portion on the rear side,
The vehicle battery case according to claim 3.
A mounting bracket for mounting the battery case to the vehicle is provided on the vehicle width direction outer side surface of the battery housing,
The mounting bracket overlaps the rear end of the first truss portion on the front side and the front end of the first truss portion on the rear side, which are formed side by side in the vehicle longitudinal direction, when viewed in the vehicle width direction.
The vehicle battery case according to claim 3 or 4.
Having a second partition that partitions the space in the battery storage part into the front and rear,
The second partition passes through the X-shaped intersection of the first truss parts in plan view,
The vehicle battery case according to any one of claims 1 to 5.
One end side of the second truss portion in the front-rear direction is connected to the first truss portion, and the other end side in the front-rear direction is connected to the second bulkhead.
The vehicle battery case according to claim 6.
A mounting bracket for mounting the battery case to the vehicle is provided on the vehicle width direction outer side surface of the battery housing,
The mounting bracket is provided so as to overlap with the second partition when viewed in the vehicle width direction,
The vehicle battery case according to claim 6 or 7.
The vehicle is a hybrid vehicle having an internal combustion engine, and an exhaust pipe extending from the internal combustion engine toward the rear of the vehicle is inserted through the tunnel portion.
The vehicle battery case according to any one of claims 1 to 8.