Power storage device

Abstract

To provide a power storage device which can suppress vibration in a vertical direction and a lamination direction of a laminated body.SOLUTION: A power storage device includes: a laminated body in which battery cells and spacers are laminated; and a housing which houses the laminated body. The housing includes a pair of side walls extending in a lamination direction of the laminated body. At least one of the spacers laminated on the battery cells includes: an upper surface holding part which holds an upper surface of the battery cell; and a fixing part which connects the upper surface holding part with the side wall and fixes these components.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

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

[0003] [Patent Document 1] Patent Publication No. 2022-181020 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in a structure in which a stack of battery cells and spacers is compressed and housed in a housing, the stack vibrates vertically and in the stacking direction when mounted on a vehicle. Vertical vibrations can be suppressed, for example, by inserting a sponge material in the upper part of the stack, but vibrations in the stacking direction cannot be suppressed.

[0005] The present disclosure has been made in view of the above, and has an object to provide an electricity storage device capable of suppressing vibrations of a stack in the vertical direction and in the stacking direction. [Means for solving the problem]

[0006] The energy storage device of the present disclosure comprises a stack of battery cells and spacers, and a housing that houses the stack, wherein the housing has a pair of side walls extending in the stacking direction of the stack, and at least one of the spacers stacked with the battery cells comprises 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 to the side wall. Effect of the Invention

[0007] According to the present disclosure, by using a spacer that includes 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 and the side wall, vibration of the stack in the vertical and stacking directions can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view showing a schematic configuration of a power storage device according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a state where FIG. 1 is cut along the line AA. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An electric storage device according to an embodiment of the present disclosure will be described with reference to the drawings. Note that components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same.

[0010] The configuration of the power storage device according to the embodiment will be described with reference to Figures 1 and 2. The power storage device according to the embodiment is mounted on a vehicle such as a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV).

[0011] As shown in FIGS. 1 and 2, the electricity storage device 1 includes a laminate 10, a support member 20, and a housing 30.

[0012] The stack 10 has a structure in which a plurality of battery cells 11 and a plurality of spacers (cell separators) 12, 13 are stacked in a predetermined direction (stacking direction). A plurality of stacks 10 (two in this case) are housed in the space inside the housing 30.

[0013] In the stack 10, the battery cells 11 and the spacers 12, 13 are alternately arranged in the stacking direction. The spacers 12 and 13 have the same function but differ in thickness in the stacking direction. That is, the thickness of the spacer 12 is configured to be smaller than the thickness of the spacer 13.

[0014] The spacers 12 and the spacers 13 are arranged alternately one by one in the stacking direction. However, the arrangement of the spacers 12 and the spacers 13 is not limited thereto, and for example, the spacers 12 and the spacers 13 may be arranged alternately in the stacking direction in multiples.

[0015] Here, in each stack 10 housed within the housing 30 , at least one of the spacers 12 , 13 stacked with the battery cell 11 includes an upper surface holding portion 14 and a fixing portion 15 .

[0016] The upper surface holding portion (flange) 14 is for holding the upper surface of the battery cell 11. In the example of Fig. 1, the upper surface holding portion 14 is attached to a spacer 13 that is arranged near the center in the stacking direction of the stack 10. Note that while the figure shows an example in which the spacer 13 and the upper surface holding portion 14 are configured as separate bodies, the spacer 13 and the upper surface holding portion 14 may also be configured as a single unit.

[0017] 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 formed of a fastening member such as a bolt.

[0018] In this way, three types of spacers (thin spacers 12, thick spacers 13, and spacers 13 with upper surface holding parts 14) are used in stack 10. Also, by using spacers 12 and 13 with different thicknesses, it becomes possible to position spacers 13 with upper surface holding parts 14 in desired positions without being affected by variations in the thickness of battery cells 11.

[0019] The support member 20 is for supporting the stack 10 within the housing 30. The support member 20 supports the stack 10 at both ends of the stack 10 in the stacking direction.

[0020] The housing 30 is for housing the laminate 10. The housing 30 is made of, for example, aluminum die casting. The housing 30 also includes a pair of side walls 31 and a cover member 32.

[0021] The side wall 31 is for dividing the inside of the housing 30 into a plurality of spaces (two in this example). The side wall 31 extends in the stacking direction of the stack 10. As shown in FIG. 2, the upper surface holding part 14 is fixed to the upper part of the side wall 31 by a fixing part 15.

[0022] The cover member 32 is for covering the upper part of the housing 30. The cover member 32 is formed in a flat plate shape.

[0023] The energy storage device according to the embodiment described above uses a spacer 13 including an upper surface holding portion 14 that holds the upper surface of the battery cell 11 and a fixing portion 15 that connects and fixes the upper surface holding portion 14 and the side wall 31. This makes it possible to suppress vibration of the stack 10 in the vertical direction and in the stacking direction when the energy storage device 1 is mounted on a vehicle.

[0024] That is, in the energy storage device according to the embodiment, three types of spacers (thin spacers 12, thick spacers 13, and spacers 13 with upper surface holding parts 14) are used, and the spacers 13 with upper surface holding parts 14 are arranged in predetermined positions to suppress movement of the stack 10 including the battery cells 11 in the vertical and stacking directions. This makes it possible to eliminate the sponge member that has been conventionally used to suppress vibration in the vertical direction, thereby reducing costs. Furthermore, a high effect can be expected with respect to vibration in the stacking direction, which could not be suppressed with conventional structures.

[0025] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0026] 1. Energy storage device 10 Laminate 11 Battery Cell 12,13 Spacer 14 Top holding part 15 Fixed part 20 Support member 30 Case 31 Side wall 32 Lid member

Claims

[Claim 1] a stack of battery cells and spacers; A housing that houses the laminate; Equipped with The housing includes a pair of side walls extending in a stacking direction of the stack, At least one of the spacers stacked with the battery cell is an upper surface holding portion that holds an upper surface of the battery cell; a fixing portion that connects and fixes the upper surface holding portion and the side wall; A power storage device comprising:

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