JP2021109570A - Energy storage module fixing structure - Google Patents

Abstract

To provide an energy storage stack fixing structure which can inhibit an impact from being input to an energy storage stack during a rear collision of a vehicle.SOLUTION: An energy storage module fixing structure 10 includes: an energy storage module 20 disposed at the front side of a rear cross member 1; and a bracket 30 which fixes the energy storage module 20 to the rear cross member 1. The energy storage module 20 includes: an energy storage stack 21 formed by laminating energy storage cells 25 in a vertical direction; and an upper restraint member 22 and a lower restraint member 23 which sandwich the energy storage stack 21 in the vertical direction. One end 31 side of the bracket 30 is fixed to the upper restraint member 22, and the other end 32 side of the bracket 30 is fixed to the rear cross member 1 at a position lower than a position where the one end 31 side of the bracket 30 is fixed to the upper restraint member 22.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a fixed structure of a power storage module mounted on a vehicle.

Conventionally, Japanese Patent Application Laid-Open No. 2017-71253 (Patent Document 1) describes that the lower front portion of a battery pack case in which a battery stack is housed is fixed to a front cross member by a front bracket, and the upper rear portion of the battery pack case is described. Is disclosed as a technique capable of fixing the battery to the rear cross member with a rear bracket.

Japanese Unexamined Patent Publication No. 2017-71253

In the fixing mode of the battery pack in Patent Document 1, the rear bracket is provided so as to extend linearly from the back surface (rear surface) of the battery pack case toward the rear of the vehicle. Therefore, when the vehicle is hit backward, the rear bracket is pressed forward by the rear cross member. In such a case, there is a concern that the back surface of the battery pack case pressed against the rear bracket may come into contact with the battery stack due to deformation, and an impact may be input to the battery stack.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is a fixed structure of a power storage stack capable of suppressing an impact from being input to the power storage stack at the time of a rear collision of a vehicle. Is to provide.

The fixing structure of the power storage module based on the present disclosure includes a power storage module arranged on the front side of the rear cross member and a bracket for fixing the power storage module to the rear cross member. The power storage module includes a power storage stack in which a plurality of power storage cells are stacked in the vertical direction, and an upper restraint member and a lower restraint member that sandwich the power storage stack in the vertical direction. One end side of the bracket is fixed to the upper restraint member, and the other end side of the bracket is higher than the position where the other end side of the bracket is fixed to the upper restraint member. It is fixed to the rear cross member at a low position.

According to the above configuration, the other end of the bracket is fixed to the rear cross member at a position lower than the position where one end of the bracket is fixed to the upper restraint member, so that the power storage module can be moved to the upper side. It is fixed so that it can be hung from. Therefore, when the vehicle is rear-butted and the other end side of the bracket moves forward, the bracket is deformed so that one end side of the bracket fixed to the power storage module escapes upward. As a result, even when the rear cross member moves forward due to the rear collision, the power storage module moves away from the rear cross member due to the deformation of the bracket. As a result, it is possible to prevent an impact from being input to the power storage module.

According to the present disclosure, it is possible to provide a fixed structure of a power storage stack that can suppress an impact from being input to the power storage stack at the time of a rear collision of a vehicle.

It is a figure which shows the fixed structure of the power storage module mounted on the vehicle which concerns on embodiment. It is a figure which shows the movement of the power storage module when the vehicle provided with the power storage module according to the embodiment is hit back.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

FIG. 1 is a diagram showing a fixed structure of a power storage module mounted on a vehicle according to an embodiment. The fixed structure 10 of the vehicle 100 and the power storage module according to the embodiment will be described with reference to FIG.

The vehicle 100 according to the embodiment includes a power storage module 20 and is configured to travel using the electric power stored in the power storage module 20. The vehicle 100 may be an electric vehicle that can travel using only the electric power stored in the power storage module 20, or uses both the power stored in the power storage module 20 and the output of the engine (not shown). It may be a hybrid vehicle that can run on the vehicle.

The vehicle 100 includes a rear cross member 1 and a floor panel 2. The floor panel 2 is a member that forms a floor surface in the vehicle interior. The floor panel 2 includes a front side portion 2a, a rear side portion 2b, and a step portion 2c. The front side portion 2a is located below the rear cross member 1. The rear side portion 2b is located above the rear cross member 1. The step portion 2c connects the front side portion 2a and the rear side portion 2b. The step portion 2c is located in front of the rear cross member 1 and faces the rear cross member 1.

The vehicle 100 includes a fixed structure 10 of a power storage module. The fixed structure 10 of the power storage module includes a power storage module 20 and a bracket 30.

The power storage module 20 is located in front of the rear cross member 1. More specifically, the power storage module 20 is located in front of the step portion 2c of the floor panel 2. The power storage module 20 includes a power storage stack 21, an upper restraint member 22, and a lower restraint member 23.

The storage stack 21 has a plurality of storage cells 25 stacked in the vertical direction. The power storage cell 25 is, for example, a nickel metal hydride battery. The power storage cell 21 may be a lithium ion battery. Further, the storage cell 25 may use a liquid electrolyte or a solid electrolyte. The storage cell 25 may be a unit capacitor configured so that it can be charged and discharged. The storage cell 25 has, for example, a square shape.

The upper restraint member 22 and the lower restraint member 23 sandwich the storage stack 21 in the vertical direction. The upper restraint member 22 is arranged on the upper end side of the storage stack 21. The upper restraining member 22 is located at a position higher than the upper surface 1a of the cross member 1. The lower restraint member 23 is arranged on the lower end side of the storage stack 21. The upper restraint member 22 and the lower restraint member 23 are, for example, end plates.

The bracket 30 fixes the power storage module 20 to the rear cross member 1. The bracket 30 has one end 31, a central portion 33, and the other end 32 in the front-rear direction of the vehicle 100. One end 31 side of the bracket 30 is located on the front side, and is located higher than the other end 32 side of the bracket 30. The central portion 33 connects one end 31 side of the bracket 30 and the other end 32 side of the bracket 30. The central portion 33 of the bracket 30 is inclined downward toward the rear side of the vehicle 100.

One end 31 side of the bracket 30 is fixed to the upper restraint member 22. Specifically, one end 31 side of the bracket is fixed to the upper surface 22a of the upper restraining member 22. One end 31 side of the bracket 30 is fixed to the upper restraint member 22 by, for example, a fastening member 61.

The other end 32 side of the bracket 30 is fixed to the rear cross member 1 at a position lower than the position where one end 31 side of the bracket 30 is fixed to the upper restraint member 22. Specifically, the other end 32 side of the bracket 30 is fixed to the upper surface 1a of the rear cross member 1 by the fastening member 62.

The power storage module 20 is fixed by such a bracket 30 so as to be suspended from the upper side. In such a case, the upper surface 22a of the upper restraint member 22 is located above the upper surface 1a of the rear cross member 1, and the lower surface of the power storage module 20 (lower surface 23a of the lower restraint member 23) is the floor panel. The power storage module 20 is fixed so as to be located above the front side portion 2a of 2.

FIG. 2 is a diagram showing the movement of the power storage module when the vehicle equipped with the power storage module according to the embodiment is hit back. In FIG. 2, the state before the vehicle is hit back is shown by a broken line, and the state after the vehicle is hit back is shown by a solid line. With reference to FIG. 2, the movement of the power storage module 20 when the vehicle 100 is hit back will be described.

As shown in FIG. 2, when the vehicle is hit backward, an impact is input from the rear of the rear cross member 1 as shown by the arrow AR1. Due to this impact, the rear cross member 1 moves to the front side. At this time, together with the rear cross member 1, the other end 32 side of the bracket 30 fixed to the upper surface 1a of the rear cross member 1 also moves to the front side.

At this time, a force acts so that the lower side of the central portion 33 of the bracket 30 moves forward, so that the upper side of the central portion 33 of the bracket 30 moves upward and toward the rear side of the vehicle. change. As a result, the bracket 30 is deformed so that one end 31 side of the bracket 30 fixed to the power storage module 20 escapes upward. Therefore, even when the rear cross member 1 moves forward due to the rear collision, the power storage module 20 moves away from the rear cross member 1 due to the above deformation of the bracket 30. As a result, it is possible to prevent the rear cross member 1 from coming into contact with the power storage module 20, and it is possible to prevent an impact from being input to the power storage module 20.

As described above, the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is indicated by the claims and includes all modifications within the meaning and scope equivalent to the claims.

1 Rear cross member, 1a top surface, 2 floor panel, 2a front side part, 2b rear side part, 2c stepped part, 10 fixed structure, 20 power storage module, 21 power storage stack, 22 upper side restraint member, 22a top side, 23 lower side Restraint member, 23a lower surface, 25 power storage cell, 30 bracket, 31 one end, 32 other end, 33 center part, 61, 62 fastening member, 100 vehicles.

Claims (1)

The power storage module located on the front side of the rear cross member,
A bracket for fixing the power storage module to the rear cross member is provided.
The power storage module includes a power storage stack in which a plurality of power storage cells are stacked in the vertical direction, and an upper restraint member and a lower restraint member that sandwich the power storage stack in the vertical direction.
One end side of the bracket is fixed to the upper restraining member.
The other end side of the bracket is a fixing structure of a power storage module in which the one end side of the bracket is fixed to the rear cross member at a position lower than the position fixed to the upper restraining member.

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