Energy storage module

Abstract

To provide an energy storage module that can expand the detection range of electrical leakage. [Solution] The energy storage module 1 comprises a plurality of energy storage cells 110 arranged in one direction, an intermediate plate 120 positioned in the middle of the plurality of energy storage cells 110 in one direction, and a restraining member 200 that restrains the plurality of energy storage cells 110 and the intermediate plate 120 from both sides of the energy storage cells 110 and the intermediate plate 120 in one direction. The intermediate plate 120 is electrically connected to the restraining member 200.

Description

Technical Field

[0001] The present disclosure relates to a power storage module.

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2024-120441 discloses a battery module including a plurality of battery cells, an intermediate plate, a pair of end plates, and a restraining member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a battery module as described in Japanese Patent Application Laid-Open No. 2024-120441, it is difficult to secure a space for leakage detection.

[0005] An object of the present disclosure is to provide a power storage module capable of expanding the leakage detection range.

Means for Solving the Problems

[0006] A power storage module according to an aspect of the present disclosure includes a plurality of power storage cells arranged in one direction, an intermediate plate disposed at an intermediate portion of the plurality of power storage cells in the one direction, and a restraining member that restrains the plurality of power storage cells and the intermediate plate from both sides of the power storage cells and the intermediate plate in the one direction, and the intermediate plate is electrically connected to the restraining member.

Effects of the Invention

[0007] According to the present disclosure, it is possible to provide a power storage module capable of expanding the leakage detection range. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic side view showing an energy storage module in one embodiment of the present disclosure. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] This diagram schematically shows modified examples of the intermediate plate and the restraining member. [Modes for carrying out the invention]

[0009] Embodiments of this disclosure will be described with reference to the drawings. In the drawings referred to below, the same or equivalent components are given the same number.

[0010] Figure 1 is a schematic side view showing an energy storage module in one embodiment of the present disclosure. Figure 2 is a cross-sectional view taken along line II-II in Figure 1.

[0011] The energy storage module 1 in this embodiment is preferably mounted on a vehicle. Examples of vehicles include hybrid electric vehicles, plug-in hybrid electric vehicles, and battery electric vehicles.

[0012] As shown in Figures 1 and 2, the energy storage module 1 comprises an energy storage stack 100 and a restraining member 200.

[0013] The energy storage stack 100 includes a plurality of energy storage cells 110, an intermediate plate 120, and a pair of end plates 130.

[0014] Multiple energy storage cells 110 are arranged along one direction (the left-right direction in Figure 1). Hereinafter, this direction will be referred to as "first direction DR1". Each energy storage cell 110 is formed in the shape of a rectangular parallelepiped. Each energy storage cell 110 is formed in the shape of a flattened rectangular parallelepiped. Examples of each energy storage cell 110 include lithium-ion batteries. Each energy storage cell 110 may be composed of an all-solid-state battery using a solid electrolyte.

[0015] Each energy storage cell 110 has a cell body 112 including an electrode body, and a pair of external terminals 114 provided on the upper surface of the cell body 112.

[0016] The intermediate plate 120 is positioned in the middle of the multiple energy storage cells 110 in the first direction DR1. The intermediate plate 120 is made of metal or the like. As shown in Figure 2, the intermediate plate 120 has a plate body 122 and a pair of protrusions 124.

[0017] The plate body 122 is located between a pair of adjacent energy storage cells 110 in the first direction DR1. The plate body 122 is formed in the center in the width direction (left-right direction in Figure 2), which is perpendicular to both the first direction DR1 and the vertical direction. Hereinafter, the width direction will be referred to as the second direction DR2. The plate body 122 is formed in a rectangular shape. The dimensions of the plate body 122 in the vertical direction may be larger than the dimensions of the cell body 112 in the vertical direction.

[0018] The pair of projections 124 project outward in the second direction DR2 from the end of the plate body 122 in the second direction DR2. Each projection 124 is connected to the lower end of the plate body 122. As shown in Figure 2, the distance between the pair of projections 124 in the second direction DR2 is greater than the width dimension of the energy storage cell 110. As shown in Figure 1, the upper surface 124a of each projection 124 is curved to be convex upward.

[0019] A pair of end plates 130 are disposed on both sides of a plurality of power storage cells 110 in one direction. Each end plate 130 is made of metal or the like. As shown in FIG. 1, each end plate 130 is grounded.

[0020] The restraining member 200 restrains the power storage stack 100 from both sides in one direction of the power storage stack 100. The power storage module 1 in the present embodiment is provided on both sides of a plurality of power storage cells 110 in the second direction DR2. Each restraining member 200 extends from one end side to the other end side of the power storage stack 100 in the first direction DR1. More specifically, one end of each restraining member 200 in the first direction DR1 is fixed to one of the pair of end plates 130, and the other end of each restraining member 200 in the first direction DR1 is fixed to the other of the pair of end plates 130. Each restraining member 200 is made of metal. Each restraining member 200 has the same electric potential as each end plate 130.

[0021] As shown in FIGS. 1 and 2, the restraining member 200 has a receiving portion 202. The receiving portion 202 receives the protruding portion 124. The receiving portion 202 is formed at a position facing the upper surface 124a of the protruding portion 124. As shown in FIG. 1, the receiving portion 202 is curved so as to be convex upward. More specifically, the receiving portion 202 has a shape corresponding to the upper surface 124a of the protruding portion 124.

[0022] The intermediate plate 120 is electrically connected to the restraining member 200. That is, the intermediate plate 120 has a ground potential together with the restraining member 200 and the end plate 130. As shown in FIG. 2, a conductive adhesive 300 may be provided between the receiving portion 202 of the restraining member 200 and the upper surface 124a of the protruding portion 124. In FIG. 1, the illustration of the conductive adhesive is omitted.

[0023] As described above, in the power storage module 1 according to the present embodiment, since the end plate 130, the restraint member 200, and the intermediate plate 120 are at the same potential, when the end plate 130 is grounded, the intermediate plate 120 also becomes the ground potential. Therefore, since it becomes possible to detect leakage through the intermediate plate 120 by the leakage detection circuit of the power storage module 1, the leakage detection range is expanded. Accordingly, it becomes possible to omit the space for leakage detection.

[0024] In addition, as shown in FIG. 3, the upper surface 124a of the protruding portion 124 may be formed flat.

[0025] Those skilled in the art will understand that the above-described exemplary embodiments are specific examples of the following aspects.

[0026] [Aspect 1] A plurality of power storage cells arranged in one direction, An intermediate plate disposed at an intermediate portion of the plurality of power storage cells in the one direction, A restraint member that restrains the plurality of power storage cells and the intermediate plate from both sides of the power storage cells and the intermediate plate in the one direction, and The intermediate plate is electrically connected to the restraint member, a power storage module.

[0027] In this power storage module, since the end plate, the restraint member, and the intermediate plate are at the same potential, when the end plate is grounded, the intermediate plate also becomes the ground potential. Therefore, since it becomes possible to detect leakage through the intermediate plate by the leakage detection circuit of the power storage module, the detection range is expanded. Accordingly, it becomes possible to omit the space for leakage detection.

[0028] [Aspect 2] The intermediate plate is A plate body located between a pair of the power storage cells adjacent to each other in the one direction, It has a pair of protrusions that project outward from the plate body in the width direction, which is perpendicular to both the aforementioned one direction and the vertical direction, The energy storage module according to embodiment 1, wherein the restraining member has a pair of receiving portions that receive each of the protrusions.

[0029] In this embodiment, the relative positions of the intermediate plate and the restraining member in one direction are effectively determined.

[0030] [Aspect 3] The dimension between the pair of protrusions in the width direction is greater than the dimension of the energy storage cell in the width direction.

[0031] In this embodiment, the intermediate plate receives the external force acting on the energy storage module in the width direction, thereby suppressing damage to the energy storage cells.

[0032] It should be noted that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of this disclosure is defined by the claims rather than the description of the embodiments above, and includes all modifications within the meaning and scope equivalent to the claims. [Explanation of Symbols]

[0033] 1 Energy storage module, 100 Energy storage stack, 110 Energy storage cell, 112 Cell body, 114 External terminal, 120 Intermediate plate, 122 Plate body, 124 Protruding part, 130 End plate, 200 Restraining member, 202 Receiving part, 300 Conductive adhesive.

Claims

[Claim 1] Multiple energy storage cells arranged in one direction, An intermediate plate positioned in the middle of the plurality of energy storage cells in the aforementioned one direction, The system includes a restraining member that restrains the plurality of energy storage cells and the intermediate plate from both sides of the energy storage cells and the intermediate plate in the aforementioned one direction, The intermediate plate is electrically connected to the restraining member, forming an energy storage module.

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