Electricity storage device

Abstract

The utility model provides an electrical storage device capable of suppressing vibration of a laminated body in the up-down 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 utility model relates to a power storage device. Background Art

[0002] A technique for manufacturing a battery pack by stacking a plurality of battery cells, compressing them from both sides, and housing the compressed plurality of battery cells in a casing is disclosed in Patent Document 1.

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

[0004] For example, in a configuration in which a laminate formed by laminating battery cells and spacers is compressed and housed in a casing, the laminate vibrates in the vertical direction or the lamination direction when mounted on a vehicle. Regarding the vibration in the vertical direction, for example, it can be suppressed by placing a sponge member on the upper part of the laminate, but the vibration in the lamination direction cannot be suppressed.

[0005] The present utility model has been completed in view of the above circumstances, and an object thereof is to provide a power storage device capable of suppressing vibration of a laminate in the vertical direction and the lamination direction.

[0006] The power storage device according to the present utility model includes: a laminate formed by laminating a plurality of battery cells and a plurality of spacers; a casing that houses the laminate, the casing having a pair of side walls extending in the lamination direction of the laminate, and at least one of the plurality of spacers including: an upper surface holding portion that holds the upper surface of the battery cell; and a fixing portion that connects and fixes the upper surface holding portion to the side wall.

[0007] According to the present utility model, by using a spacer having an upper surface holding portion that holds the upper surface of the battery cell and a fixing portion that connects and fixes the upper surface holding portion to the side wall, vibration of the laminate in the vertical direction and the lamination direction can be suppressed. Brief Description of the Drawings

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

[0009] Figure 2 It is a cross-sectional view showing a state cut along line A-A Figure 1 of the state. Detailed Description of the Embodiment

[0010] Hereinafter, the power storage device according to the embodiment of the present utility model will be described with reference to the drawings. In addition, among the components in the following embodiments, there are components that can be easily replaced by those skilled in the art or components that are substantially the same.

[0011] While referring to Figure 1 and Figure 2 the structure of the electricity storage device involved in the embodiment will be described. The electricity storage device involved in the embodiment is, for example, an electricity storage device mounted on a vehicle such as a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV).

[0012] As Figure 1 and Figure 2 shown, the electricity storage device 1 has a laminate 10, a support member 20, and a housing 30.

[0013] The laminate 10 has a structure in which a plurality of battery cells 11 and a plurality of spacers (cell separators) 12 and 13 are laminated in a predetermined direction (lamination direction). A plurality (here, two) of such laminates 10 are housed in the space within the housing 30.

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

[0015] In addition, the spacers 12 and 13 are alternately arranged one by one in the lamination direction. In addition, the arrangement of the spacers 12 and 13 is not limited to this. For example, in the lamination direction, the spacers 12 and 13 may also be alternately arranged in plural numbers.

[0016] Here, in each laminate 10 housed in the housing 30, at least one of the spacers 12 and 13 laminated with the battery cell 11 has an upper surface holding portion 14 and a fixing portion 15.

[0017] The upper surface holding portion (flange) 14 is for holding the upper surface of the battery cell 11. In Figure 1 the example, the upper surface holding portion 14 is mounted on the spacer 13 near the center in the lamination direction of the laminate 10. In addition, in this 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 integrally formed.

[0018] The fixing portion 15 is for connecting and fixing the upper surface holding portion 14 to the side wall 31 of the housing 30. The fixing portion 15 is constituted by a fastening member such as a bolt, for example.

[0019] Thus, in the laminate 10, three types of spacers are used (the thin spacer 12, the thick spacer 13, and the spacer 13 with the upper surface holding portion 14). Additionally, by using spacers 12 and 13 with different thicknesses, the spacer 13 with the upper surface holding portion 14 can be arranged at a desired position without being affected by the thickness deviation of the battery cells 11.

[0020] The support member 20 is used to support the laminate 10 within the housing 30. The support member 20 supports the laminate 10 at both ends in the stacking direction of the laminate 10.

[0021] The housing 30 is used to accommodate the laminate 10. The housing 30 is formed of, for example, an aluminum die-cast or the like. Additionally, the housing 30 has a pair of side walls 31 and a lid member 32.

[0022] The side wall 31 is used to divide the interior of the housing 30 into a plurality of (here, two) spaces. The side wall 31 extends in the stacking direction of the laminate 10. Additionally, as Figure 2 shown, at the upper part of the side wall 31, the upper surface holding portion 14 is fixed by the fixing portion 15.

[0023] The lid member 32 is used to cover the upper part of the housing 30. The lid member 32 is formed in a flat plate shape.

[0024] In the power storage device of the embodiment described above, the spacer 13 is used, and the spacer 13 includes an upper surface holding portion 14 for holding the upper surface of the battery cell 11 and a fixing portion 15 for connecting and fixing the upper surface holding portion 14 to the side wall 31. Thereby, vibrations of the laminate 10 in the vertical direction and the stacking direction when the power storage device 1 is mounted on a vehicle can be suppressed.

[0025] That is, in the power storage device according to the embodiment, by using three types of spacers (the thin spacer 12, the thick spacer 13, and the spacer 13 with the upper surface holding portion 14) and arranging the spacer 13 with the upper surface holding portion 14 at a specified position, movement of the laminate 10 including the battery cells 11 in the vertical direction and the stacking direction is suppressed. Thereby, the sponge member used in the past for suppressing vertical vibrations can be eliminated, and thus the cost can be reduced. In addition, good effects can also be expected for vibrations in the stacking direction that could not be suppressed in the past structure.

[0026] Those skilled in the art can easily derive further effects and modification examples. Therefore, the broader embodiments of the present utility model are not limited to the specific details and representative embodiments described and recited above. Therefore, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the claims 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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