Electricity storage device

Abstract

The invention provides a power storage device capable of suppressing vibration of a laminated body in the vertical direction and the lamination direction. A power storage device is provided with a laminated body in which a plurality of battery cells and a plurality of spacers are laminated, and a frame body for housing the laminated body, the frame body being provided with a pair of side walls extending in the lamination direction of the laminated body. At least one of the plurality of spacers includes an upper surface holding portion that holds an upper surface of the battery cell, and a fixing portion that connects and fixes the upper surface holding portion and the side wall.

Description

Technical Field

[0001] The present invention relates to an electric storage device. Background Art

[0002] Patent Document 1 discloses a technology for manufacturing a battery pack by stacking a plurality of battery cells, compressing the battery cells from both sides, and housing the compressed battery cells in a frame.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-181020 Summary of the invention

[0004] For example, in a structure where a stacked body formed by stacking battery cells and spacers is compressed and stored in a frame, the stacked body will vibrate in the vertical direction or in the stacking direction when mounted on a vehicle. The vertical vibration can be suppressed by, for example, placing a sponge component on the upper part of the stacked body, but the vibration in the stacking direction cannot be suppressed.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power storage device capable of suppressing vibration of a stacked body in the up-down direction and in the stacking direction.

[0006] The power storage device involved in the present invention comprises: a stacked body formed by stacking a plurality of battery cells and a plurality of spacers; a frame body accommodating the stacked body, the frame body comprising a pair of side walls extending in the stacking direction of the stacked body, and at least one of the plurality of spacers comprising: an upper surface retaining portion for retaining the upper surface of the battery cell; and a fixing portion for connecting and fixing the upper surface retaining portion to the side wall.

[0007] According to the present invention, by using a spacer having an upper surface holding portion for holding the upper surface of a battery cell and a fixing portion for connecting and fixing the upper surface holding portion to a side wall, vibration of the stacked body in the vertical direction and in the stacking direction can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a plan view showing a schematic structure of the power storage device according to the embodiment.

[0009] Figure 2 It means cutting along line AA Figure 1 Cross-sectional view of the state. DETAILED DESCRIPTION

[0010] Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. The components in the following embodiments include components that can be easily replaced by a person skilled in the art, or components that are substantially the same.

[0011] In reference Figure 1 as well as Figure 2 The structure of the power storage device according to the embodiment will be described. The power storage device according to the embodiment is, for example, a power storage device mounted on a vehicle such as a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV).

[0012] like Figure 1 and Figure 2 As shown, the power storage device 1 includes a stacked body 10 , a support member 20 , and a frame 30 .

[0013] The stacked body 10 has a structure in which a plurality of battery cells 11 and a plurality of spacers (cell separators) 12 and 13 are stacked in a predetermined direction (stacking direction). A plurality (here, two) of the stacked bodies 10 are accommodated in the space within the frame 30 .

[0014] In the stack 10, the battery cells 11 and the spacers 12 and 13 are alternately arranged in the stacking direction. In addition, the spacers 12 and 13 have the same function, but have different thicknesses in the stacking direction. That is, the thickness of the spacer 12 is configured to be smaller than the thickness of the spacer 13.

[0015] The spacers 12 and 13 are alternately arranged one by one in the stacking direction. The arrangement of the spacers 12 and 13 is not limited thereto, and for example, a plurality of the spacers 12 and 13 may be alternately arranged in the stacking direction.

[0016] Here, in each stacked body 10 housed in the frame body 30 , at least one of the spacers 12 and 13 stacked on the battery cell 11 includes the upper surface holding portion 14 and the fixing portion 15 .

[0017] The upper surface holding portion (flange) 14 is used to hold the upper surface of the battery cell 11. Figure 1 In the example of , the upper surface holding portion 14 is mounted on the spacer 13 disposed near the center in the stacking direction of the stacked body 10. In addition, in the figure, an example in which the spacer 13 and the upper surface holding portion 14 are separately formed is shown, but the spacer 13 and the upper surface holding portion 14 may also be formed integrally.

[0018] The fixing portion 15 is used to connect and fix the upper surface holding portion 14 and the side wall 31 of the frame body 30. The fixing portion 15 is composed of a fastening member such as a bolt, for example.

[0019] In this way, three types of spacers (thin spacer 12, thick spacer 13, and spacer 13 with upper surface retaining portion 14) are used in the stacked body 10. In addition, by using spacers 12 and 13 having different thicknesses, the spacer 13 with upper surface retaining portion 14 can be arranged at a desired position without being affected by the thickness variation of the battery cell 11.

[0020] The support member 20 is used to support the stacked body 10 in the frame 30. The support member 20 supports the stacked body 10 at both ends of the stacked body 10 in the stacking direction.

[0021] The frame 30 is used to store the stacked body 10 . The frame 30 is made of, for example, aluminum die casting or the like. The frame 30 has a pair of side walls 31 and a cover member 32 .

[0022] The side wall 31 is used to divide the frame 30 into a plurality of spaces (two in this case). The side wall 31 extends in the stacking direction of the stacked body 10. Figure 2 As shown, the upper surface holding portion 14 is fixed to the upper portion of the side wall 31 via the fixing portion 15 .

[0023] The cover member 32 is used to cover the upper portion of the frame body 30. The cover member 32 is formed in a flat plate shape.

[0024] The power storage device of the embodiment described above uses the spacer 13, which includes the upper surface holding portion 14 that holds the upper surface of the battery cell 11 and the fixing portion 15 that connects and fixes the upper surface holding portion 14 and the side wall 31. This can suppress vibration of the stacked body 10 in the vertical direction and the stacking direction when the power storage device 1 is mounted on a vehicle.

[0025] That is, in the power storage device according to the embodiment, three types of spacers (thin spacers 12, thick spacers 13, and spacers 13 with upper surface retaining portions 14) are used, and the spacers 13 with upper surface retaining portions 14 are arranged at predetermined positions to suppress the movement of the stack 10 including the battery cells 11 in the vertical direction and in the stacking direction. This eliminates the need for sponge components that have been used to suppress vibrations in the vertical direction, thereby reducing costs. In addition, a good effect can be expected for vibrations in the stacking direction that could not be suppressed in the conventional structure.

[0026] Those skilled in the art can easily deduce further effects and variations. Therefore, the broader embodiments of the present invention are not limited to the specific details and representative embodiments described above and recorded. Therefore, various changes may be made without departing from the spirit or scope of the general inventive concept defined by the technical solutions and their equivalents.

Claims

1. A power storage device, characterized in that: have: A stacked body formed by stacking a plurality of battery cells and a plurality of spacers; a frame for accommodating the stacked body, The frame body includes a pair of side walls extending in the stacking direction of the stacked body, and at least one of the plurality of spacers includes: an upper surface holding portion for holding an upper surface of the battery cell; A fixing portion connects and fixes the upper surface holding portion and the side wall.

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