CN-122000602-A - Power storage module

Abstract

The invention provides a power storage module capable of suppressing the excessive binding load caused by the expansion of a power storage device. The power storage module (100) is provided with a plurality of power storage devices, a binding member (110), and a spacer (120). The plurality of power storage devices have a pair of wide surfaces (11 b1, 11b 2) facing each other, and the wide surfaces (11 b1, 11b 2) are arranged facing each other. The binding member (110) is configured to bind the plurality of power storage devices in a direction in which the plurality of power storage devices are arranged with the wide surfaces (11 b1, 11b 2) facing each other. The spacer (120) is disposed between the power storage device and the binding member (110) at the 1 st end (2 a) in the direction in which the plurality of devices are arranged, and has a smaller thickness when a load greater than a predetermined load is applied in the direction in which the power storage devices are arranged.

Inventors

• Uchida gyozo

Assignees

• 泰星能源解决方案有限公司

Dates

Publication Date

20260508

Application Date

20251107

Priority Date

20241108

Claims (6)

1. 1. An electric storage module, wherein, The power storage module includes: A plurality of power storage devices; Binding member, and The space-apart pieces are arranged on the inner side of the partition board, The plurality of power storage devices have a pair of wide surfaces facing each other, and the wide surfaces are arranged to face each other, The binding member is configured to bind the plurality of power storage devices in a direction in which the plurality of power storage devices are arranged so that the wide faces face each other, The spacer is disposed between the power storage device disposed at the 1 st end in the arrangement direction among the plurality of power storage devices and the binding member, When a load larger than a predetermined load is applied in the direction of the arrangement, the thickness of the spacer becomes small.
2. 2. The power storage module according to claim 1, wherein, The power storage device includes an electrode body and a square case accommodating the electrode body, The binding member includes: A1 st end plate disposed at a1 st end portion in the direction of arrangement among the plurality of power storage devices; a2 nd end plate disposed on a2 nd end side opposite to the 1 st end side, and Side bars arranged between the 1 st end plate and the 2 nd end plate, The spacer is provided between the 1 st end plate and the wide surface of the power storage device on the 1 st end side.
3. 3. The power storage module according to claim 2, wherein, The predetermined load is 4kN or more and 80kN or less.
4. 4. The power storage module according to claim 2, wherein, The spacer is rectangular and has: a convex portion protruding in the direction of the arrangement; an outer edge part surrounding the convex part, and A joint portion connecting the convex portion and the outer edge portion, The joint portion is formed to be thinner than the thickness of the convex portion or the outer edge portion, When a load larger than a predetermined load is applied in the direction of the arrangement, the joint portion breaks, whereby the thickness becomes small.
5. 5. The power storage module according to claim 2, wherein, The spacer has: a convex portion protruding in the direction of the arrangement; a concave part provided on a facing surface facing the convex part, and A reinforcing claw portion formed at an entrance of the concave portion so as to face the convex portion, The convex portion is arranged in a state of contacting with the reinforcing claw portion to form a gap between the convex portion and the concave portion, When a load greater than a predetermined load is applied in the direction of the arrangement, the convex portion and the concave portion are fitted to each other, whereby the thickness becomes small.
6. 6. The power storage module according to any one of claims 2 to 5, wherein, The spacer is also provided between the power storage device on the 2 nd end portion side and the 2 nd end plate.

Description

Power storage module Technical Field The present disclosure relates to an electric storage module. Background Secondary batteries such as lithium ion secondary batteries are known to expand over a long period of time when repeatedly charged and discharged. A technique related to a battery pack is disclosed in japanese patent application laid-open No. 2022-13634. The battery pack disclosed in this publication includes a plurality of battery cells, a plurality of plate-like spacers, and an insulating member provided between the spacers, different from the spacers. The plurality of battery cells have a rectangular outer shape and are held in a state of being arranged in a predetermined arrangement direction. Between the battery cells, two plate-like spacers are disposed in a facing manner. The insulating member has a higher hardness than the spacers, and is provided so as to be in contact with the two spacers sandwiching the insulating member at a plurality of locations between the spacers disposed between the battery cells. It is described that the insulating member has a thickness that does not penetrate the arrangement direction of the spacers even when the space between the spacers is minimized due to an increase in the binding load, whereby the binding load increases due to expansion of the battery cells caused by aging in long-term use in addition to expansion of the battery cells caused by charge and discharge, and in this case, the increase in the binding load can be suppressed from exceeding expectations by embedding the spacers with the insulating member having a higher hardness than the spacers. Japanese patent application laid-open No. 2022-77843 discloses a battery module including a laminate formed by laminating a plurality of battery cells having a negative electrode containing lithium metal or lithium-containing metal. The battery module is provided with a fixing member at the center in the stacking direction. The fixing member fixes the battery cells located at both sides of the fixing member in the stacking direction. Japanese patent application laid-open No. 2023-116166 discloses a plurality of battery cells arranged in the 1 st direction. Electrode terminals (positive electrode terminals and negative electrode terminals) are formed in a frame housing the plurality of battery cells so as to be aligned along a 2 nd direction orthogonal to the 1 st direction. In such a battery module, the side surface portion of the frame can directly support the laminate of the battery cells. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2022-13634 Patent document 2 Japanese patent application laid-open No. 2022-77843 Patent document 3 Japanese patent laid-open No. 2023-116166 Disclosure of Invention Problems to be solved by the invention However, the present inventors considered that it is desirable to improve the situation where the binding load of the power storage module becomes too high due to expansion of the power storage device. Means for solving the problems The power storage module disclosed herein includes a plurality of power storage devices, a binding member, and spacers. The plurality of power storage devices have a pair of wide surfaces facing each other, and the wide surfaces are arranged facing each other. The binding member is configured to bind the plurality of power storage devices in a direction in which the plurality of power storage devices are arranged so that the wide faces face each other. The spacer is disposed between the power storage device disposed at the 1 st end in the arrangement direction among the plurality of power storage devices and the binding member. In addition, when a load larger than a predetermined load is applied in the direction of the above arrangement, the thickness of the spacer becomes small. According to this power storage module, the situation in which the binding load of the power storage module becomes excessively high due to expansion of the power storage device is improved. Drawings Fig. 1 is a perspective view schematically showing an electric storage module. Fig. 2 is a side view schematically showing the power storage module. Fig. 3 is a perspective view schematically showing a lithium ion battery. Fig. 4 is a longitudinal sectional view schematically showing a lithium ion battery. Fig. 5 is a schematic exploded view of the electrode body. Fig. 6 is a plan view schematically illustrating one preferred mode of the spacer disclosed herein (broken spacer). Fig. 7 is a longitudinal sectional view schematically showing a state before the operation of one preferred embodiment of the spacer disclosed herein (break-type spacer). Fig. 8 is a longitudinal sectional view schematically showing a state after an operation of one preferred embodiment of the spacer disclosed herein (broken spacer). Fig. 9 is a plan view schematically showing one preferred embodiment of the spacer disclosed herein (convex side spac