restraint device

Abstract

The present invention provides a restraining device capable of preventing the gas flow path in the electrode layer from being crushed. [Solution] The restraining device 100 comprises an elastic member 91 stacked in the Z direction with the energy storage module 80, and end plates 10 and 20 that press the elastic member 91 toward the energy storage module 80. The elastic member 91 includes an elastic portion 91a and an elastic portion 91b that is softer than the elastic portion 91a. The elastic portion 91a is provided at a position P1 that does not overlap with the gas flow path 88 in the Z direction, and the elastic portion 91b is provided at a position P2 that overlaps with the gas flow path 88 in the Z direction.

Description

Technical Field

[0001] The present disclosure relates to a restraint device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2018-098211 (Patent Document 1) discloses a secondary battery in which a plurality of single battery layers are stacked. The electrode for the secondary battery included in the secondary battery includes a current collector and an electrode layer disposed on the surface of the current collector. A gas flow path is formed in the electrode layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although not described in the above Patent Document 1, there may be a case where a secondary battery (power storage module) is restrained in the stacking direction. In this case, it is conceivable that the gas flow path is crushed by the restraint load. As a result, gas may stay inside, and there is a risk that the battery performance deteriorates.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a restraint device capable of suppressing the crushing of the gas flow path in the electrode layer.

Means for Solving the Problems

[0006] A restraining device according to one aspect of the present disclosure is a restraining device for restraining an energy storage module, comprising: an elastic member laminated with the energy storage module in the stacking direction while the energy storage module is restrained; and a pressing member for pressing the elastic member toward the energy storage module. The energy storage module includes an electrode plate. The electrode plate has a current collector and an electrode layer laminated with the current collector in the stacking direction. A gas flow path is formed in the electrode layer. The elastic member includes a first elastic portion and a second elastic portion that is softer than the first elastic portion. The first elastic portion is provided at a first position that does not overlap with the gas flow path in the stacking direction. The second elastic portion is provided at a second position that overlaps with the gas flow path in the stacking direction. [Effects of the Invention]

[0007] According to this disclosure, it is possible to suppress the crushing of the gas flow path in the electrode layer. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the configuration of a restraint device and a laminate according to one embodiment. [Figure 2] Figure 1 is an exploded view. [Figure 3] This is a cross-sectional view showing the structure of an elastic member and a laminate according to one embodiment. [Figure 4] This is a planar cross-sectional view of an elastic member according to one embodiment. [Figure 5] This is a cross-sectional view showing the configuration of a restraint device and a laminate according to a modified embodiment. [Modes for carrying out the invention]

[0009] Embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated.

[0010] A restraining device 100 according to an embodiment of this disclosure will be described with reference to Figures 1 to 4. The restraining device 100 is a jig for restraining an energy storage module during the manufacturing process of an energy storage device. The energy storage module may be a secondary battery such as a lithium-ion battery.

[0011] Figure 1 is a schematic perspective view showing an energy storage unit 200 composed of a laminate 1 and a restraining device 100. In Figure 1, the restraining device 100 restrains the laminate 1. In this specification, the Z direction is defined as the stacking direction of the laminate 1. The X and Y directions are each orthogonal to the Z direction. The X and Y directions are orthogonal to each other in a plane orthogonal to the Z direction. The Z direction is an example of the "stacking direction" in this disclosure.

[0012] The restraint device 100 comprises end plates 10 and 20 and restraint members 30 and 40. The restraint device 100 applies a restraint load to the laminate 1 in the Z direction. By applying an appropriate restraint load to the laminate 1, the distance between electrodes in the energy storage module is appropriately maintained. As a result, it is possible to suppress the deposition of metal (for example, lithium) on the electrodes (negative electrodes) of the energy storage module. Note that each of the end plates 10 and 20 is an example of the "pressing member" of this disclosure.

[0013] The laminate 1 is sandwiched in the Z direction by end plate 10 and end plate 20. End plate 10 is positioned on the Z1 side relative to the laminate 1. End plate 20 is positioned on the Z2 side relative to the laminate 1.

[0014] The restraining member 30 restrains the X1 end of the laminate 1 in the Z direction. The restraining member 40 restrains the X2 end of the laminate 1 in the Z direction.

[0015] Figure 2 shows an exploded perspective view of the energy storage unit 200. The laminate 1 is formed, for example, in a rectangular parallelepiped shape. The laminate 1 includes at least one energy storage module 80, at least one intervening module 90, and elastic sheets 2 and 3. In this embodiment, the laminate 1 includes a plurality of energy storage modules 80 and a plurality of intervening modules 90. The elastic sheets 2 and 3 are formed of, for example, urethane. The elastic sheets 2 and 3 are insulating.

[0016] Multiple energy storage modules 80 are arranged in the Z direction. Intervening modules 90 are positioned between the energy storage modules 80 that are aligned in the Z direction. Intervening modules 90 are also positioned between the energy storage modules 80 and each of the elastic sheets 2 and 3.

[0017] The intervening module 90 is conductive. Specifically, the intervening module 90 includes a current collector plate (not shown). This current collector plate is electrically connected to a power supply (not shown), and current is supplied from the power supply. For example, the current collector plate in the intervening module 90 closest to Z1 may be electrically connected to one of the positive and negative terminals of the power supply, and the current collector plate in the intervening module 90 closest to Z2 may be electrically connected to the other of the positive and negative terminals of the power supply. This charges each energy storage module 80 of the laminate 1. Note that the method of charging the energy storage modules 80 is not limited to the above example.

[0018] Elastic sheet 2 is placed between the end plate 10 and the laminate 1. Elastic sheet 2 is sandwiched in the Z direction by the end plate 10 and the laminate 1. Elastic sheet 3 is placed between the end plate 20 and the laminate 1. Elastic sheet 3 is sandwiched in the Z direction by the end plate 20 and the laminate 1. Elastic sheets 2 and 3 make it possible to apply a uniform restraining load to the laminate 1.

[0019] The end plates 10 and 20 apply pressure to the laminate 1 in the Z direction. Specifically, the end plate 10 applies pressure to the laminate 1 on the Z2 side, and the end plate 20 applies pressure to the laminate 1 on the Z1 side. The end plates 10 and 20 are plate-like members. When viewed in plan from a position away from the end plate 10 on the Z1 side, the end plate 10 has a rectangular shape that covers the laminate 1. When viewed in plan from a position away from the end plate 20 on the Z2 side, the end plate 20 has a rectangular shape that covers the laminate 1.

[0020] The end plate 10 includes a first plate 11, a second plate 12, and a plurality of ribs 13. The first plate 11 and the second plate 12 are arranged in the Z direction. The first plate 11 and the second plate 12 face each other in the Z direction. Note that the first plate 11 has the same shape and size as the second plate 12.

[0021] Each of the plurality of ribs 13 is provided between the first plate 11 and the second plate 12. The plurality of ribs 13 connect the first plate 11 and the second plate 12. Each of the plurality of ribs 13 extends in the X direction. The plurality of ribs 13 are arranged at intervals in the Y direction.

[0022] A plurality (five in this embodiment) of cutouts 11a and a plurality (five in this embodiment) of cutouts 11b are formed in the first plate 11. The plurality of cutouts 11a are provided side by side along the side of the first plate 11 on the X1 side. The plurality of cutouts 11b are provided side by side along the side of the first plate 11 on the X2 side.

[0023] A plurality of cutouts 12b are formed in the second plate 12 below the cutouts 11b of the first plate 11. That is, the plurality of cutouts 12b overlap the plurality of cutouts 11b in the Z direction.

[0024] Although not shown in Figure 2, the second plate 12 has multiple notches formed below the notch 11a of the first plate 11. These multiple notches overlap with the multiple notches 11a in the Z direction.

[0025] The end plate 20 has the same configuration as the end plate 10. That is, the end plate 20 includes a first plate 21, a second plate 22, and a plurality of ribs 23. The first plate 21 has a plurality of notches 21a and a plurality of notches 21b formed therein. The second plate 22 has a plurality of notches 22b and a plurality of notches (not shown) that overlap the notches 21a in the Z direction.

[0026] The restraining members 30 and 40 are arranged in the X direction with a gap between them, sandwiching the laminate 1. The laminate 1 is compressed in the Z direction by being sandwiched between the restraining members 30 and 40. Restricting member 30 is located on the X1 side of the laminate 1. Restricting member 40 is located on the X2 side of the laminate 1. Restricting member 30 has the same shape as restraining member 40. Therefore, only the configuration of restraining member 40 will be described in detail below.

[0027] The restraining member 40 includes a frame 41 and a plurality of column members 42. The frame 41 has an upper frame 41a and a lower frame 41b. The upper frame 41a and the lower frame 41b are spaced apart in the Z direction. Each of the upper frame 41a and the lower frame 41b extends in the Y direction.

[0028] Multiple column members 42 are arranged between the upper frame 41a and the lower frame 41b, spaced apart in the Y direction. Each of the multiple column members 42 extends in the Z direction and connects the upper frame 41a and the lower frame 41b.

[0029] With the restraining member 40 restraining the laminate 1, each of the multiple column members 42 passes through the notches 11b, 12b, 21b, and 22b which are arranged to overlap in the Z direction. In this state, the lower surface of the upper frame 41a is in contact with the upper surface 11c of the first plate 11. The upper surface of the lower frame 41b is in contact with the lower surface 22c of the second plate 22. As a result, the laminate 1, the end plate 10, and the end plate 20 are sandwiched between the upper frame 41a and the lower frame 41b.

[0030] The restraining member 30 includes a frame 31 and a plurality of column members 32. The frame 31 has an upper frame 31a and a lower frame 31b.

[0031] With the restraining member 30 restraining the laminate 1, each of the multiple column members 32 penetrates notches 11a, 21a arranged in the Z direction, and notches (not shown) formed in each of the second plate 12 and the second plate 22. In this state, the lower surface of the upper frame 31a is in contact with the upper surface 11c of the first plate 11. The upper surface of the lower frame 31b is in contact with the lower surface 22c of the second plate 22. As a result, the laminate 1, the end plate 10, and the end plate 20 are sandwiched between the upper frame 31a and the lower frame 31b.

[0032] The restraint device 100 comprises a protective member 70, a protective member 71, a protective member 72, and a protective member 73.

[0033] Each of the protective members 70 and 71 is positioned between the restraining member 30 and the restraining member 40 and fixed to the upper surface 11c of the first plate 11. The protective member 70 extends in the Y direction along the upper frame 31a. The protective member 71 extends in the Y direction along the upper frame 41a.

[0034] Each of the protective members 72 and 73 is positioned between the restraining member 30 and the restraining member 40 and is fixed to the lower surface 22c of the second plate 22. Protective member 72 extends in the Y direction along the lower frame 31b. Protective member 73 extends in the Y direction along the lower frame 41b.

[0035] Figure 3 shows a partially enlarged view of the cross-section of the laminate 1. The intervening module 90 includes an elastic member 91 to equalize the surface pressure on the energy storage module 80. The elastic member 91 is pressed towards the energy storage module 80 by the end plate 10(20) (Figure 2). In addition, a conductive sheet member or the like may be placed on the surface of the elastic member 91 to ensure conductivity in the laminate 1. This electrically connects the current collector (not shown) included in the intervening module 90 with the elastic member 91.

[0036] As shown in Figure 3, the energy storage module 80 is a bipolar type energy storage device. However, the energy storage module 80 may also be a monopolar type energy storage device.

[0037] The energy storage module 80 includes a plurality of electrode plates 81, a plurality of separators 82, a positive electrode terminal electrode plate 83, and a negative electrode terminal electrode plate (not shown). The plurality of electrode plates 81, the positive electrode terminal electrode plate 83, and the negative electrode terminal electrode plate are stacked in the Z direction via the separators 82. The plurality of electrode plates 81, the positive electrode terminal electrode plate 83, the negative electrode terminal electrode plate, and the plurality of separators 82 constitute a stacked electrode body 80a. Note that each of the electrode plates 81 and the positive electrode terminal electrode plate 83 is an example of an "electrode plate" in this disclosure.

[0038] Multiple electrode plates 81 are provided between a positive electrode terminal electrode plate 83 and a negative electrode terminal electrode plate (not shown). In this embodiment, the electrode plates 81 are bipolar electrodes. The electrode plate 81 includes a current collector 84, a positive electrode layer 85, and a negative electrode layer 86. The positive electrode layer 85 is an example of an "electrode layer" as disclosed herein.

[0039] In the electrode plate 81, a negative electrode layer 86 is provided on the main surface 84a on the Z1 side of the current collector 84. In the electrode plate 81, a positive electrode layer 85 is provided on the main surface 84b on the Z2 side of the current collector 84.

[0040] The positive electrode terminal plate 83 is located at the Z1 end of the energy storage module 80. The positive electrode terminal plate 83 includes a current collector 84 and a positive electrode layer 85. In the positive electrode terminal plate 83, the negative electrode layer 86 and positive electrode layer 85 are not provided on the main surface 84a of the current collector 84, while the positive electrode layer 85 is provided on the main surface 84b of the current collector 84. An elastic member 91 is arranged on the main surface 84a of the current collector 84 in the positive electrode terminal plate 83. The negative electrode terminal plate, which is not shown, is located at the Z2 end of the energy storage module 80.

[0041] The following description of the positive electrode layer 85 applies to both the positive electrode layer 85 of the electrode plate 81 and the positive electrode layer 85 of the positive electrode terminal electrode plate 83.

[0042] The energy storage module 80 includes a resin encapsulant 87. The resin encapsulant 87 is provided to seal the periphery of the laminated electrode body 80a. The resin encapsulant 87 seals the internal space formed between two adjacent electrode plates 81. An electrolyte is injected into this internal space.

[0043] A gas channel 88 is formed in the positive electrode layer 85. The gas generated in the energy storage module 80 flows through the gas channel 88. The gas that has flowed through the gas channel 88 is discharged to the outside of the energy storage module 80 through an outlet (not shown) formed in the resin encapsulant 87. The gas channel may also be formed in the negative electrode layer 86.

[0044] The gas flow path 88 includes a gas flow path 88a and a gas flow path 88b. Gas flow path 88a and gas flow path 88b are in communication with each other. Note that gas flow path 88a and gas flow path 88b are examples of the "first gas flow path" and "second gas flow path" of this disclosure, respectively.

[0045] The gas channel 88a extends along the outer peripheral edge of the electrode plate 81 (positive electrode end electrode plate 83). The gas channel 88a is a groove formed between the outer peripheral edge of the positive electrode layer 85 and the resin sealant 87. The gas channel 88b is formed on the inside of the outer peripheral edge of the electrode plate 81 (positive electrode end electrode plate 83). The gas channel 88b is a groove formed between portions of the positive electrode layer 85. The gas channel may also be formed by through holes formed in the positive electrode layer 85 (negative electrode layer 86), for example.

[0046] A positive electrode layer 85 is not provided between the gas flow path 88 and the current collector 84. That is, the current collector 84 is exposed in the portion where the gas flow path 88 is provided. In the portion where the gas flow path 88 is provided, the current collector 84 and the separator 82 are facing each other. However, in the portion where the gas flow path 88 is provided, the current collector 84 does not need to be exposed if a thin film of the positive electrode layer 85 is provided.

[0047] The elastic member 91 includes an elastic portion 91a and an elastic portion 91b. The elastic portion 91b is softer than the elastic portion 91a. Specifically, the elastic portion 91b deforms more when the same load is applied compared to the elastic portion 91a. In other words, the load required to deform the elastic portion 91b by the same amount is smaller compared to the elastic portion 91a. The elastic portion 91a and the elastic portion 91b are examples of the "first elastic portion" and the "second elastic portion" of this disclosure, respectively.

[0048] The elastic portion 91a is formed from the same material as the elastic portion 91b. Specifically, each of the elastic members 91a and 91b is formed from a foamed urethane resin.

[0049] This reduces the number of different parts in the restraint device 100 compared to the case where the elastic portion 91a and the elastic portion 91b are made of different materials.

[0050] Each of the elastic members 91a and 91b contains a foaming agent 91c. In this embodiment, the density of the foaming agent 91c in the elastic portion 91b is higher than the density of the foaming agent 91c in the elastic portion 91a. As a result, the elastic portion 91b is softer (less rigid) than the elastic portion 91a. For example, the density of the foaming agent 91c in the elastic portion 91b may be more than twice the density of the foaming agent 91c in the elastic portion 91a.

[0051] In this way, by adjusting the density of the foaming agent 91c in each part, multiple parts with different hardnesses can be easily formed in the elastic member 91.

[0052] In conventional restraint devices, the gas flow path may be crushed by the restraint load. As a result, gas may accumulate inside, potentially degrading battery performance.

[0053] Therefore, in this embodiment, the elastic portion 91a is provided at a position P1 that does not overlap with the gas flow path 88 in the Z direction. The elastic portion 91b is provided at a position P2 that overlaps with the gas flow path 88 in the Z direction. Positions P1 and P2 are examples of the "first position" and "second position" in this disclosure.

[0054] As a result, a relatively soft elastic portion 91b is positioned at a location P2 that overlaps with the gas flow path 88 in the Z direction, which allows the pressure on the gas flow path 88 to be relatively small when the energy storage module 80 is restrained. Consequently, the crushing of the gas flow path 88 can be suppressed.

[0055] The elastic portion 91b is positioned in a region that overlaps with the entire area where the gas flow path 88 is provided in the Z direction.

[0056] The elastic portion 91b includes portion 91d and portion 91e. Portion 91d extends along the gas channel 88a when viewed from a position P spaced apart from the electrode plate 81 (positive terminal electrode plate 83) in the Z direction. That is, portion 91d extends along the outer peripheral edge of the electrode plate 81 (positive terminal electrode plate 83). Portion 91e extends along the gas channel 88b when viewed from position P towards the electrode plate 81 (positive terminal electrode plate 83). Portion 91d and portion 91e are examples of the "first portion" and "second portion" of this disclosure, respectively.

[0057] This prevents the gas passage 88a and the gas passage 88b from being crushed by the elastic member 91.

[0058] The positive electrode layer 85 has an adjacent portion 85a adjacent to the gas flow path 88 when viewed from position P towards the electrode plate 81 (positive electrode terminal electrode plate 83).

[0059] The elastic portion 91b extends from position P2 to position P3, which overlaps with the adjacent portion 85a in the Z direction.

[0060] As a result, the elastic portion 91b extends to a position P3 where it overlaps with the adjacent portion 85a adjacent to the gas flow path 88 in the Z direction, thus more reliably suppressing the crushing of the gas flow path 88.

[0061] Specifically, portion 91d of the elastic portion 91b extends from position P2 to position P3 on the opposite side of the outer peripheral edge of the elastic member 91 (Y1 side in Figure 3). In addition, portion 91e of the elastic portion 91b extends to positions P3 located at both ends of position P2 (Y1 side and Y2 side).

[0062] Note that the width of position P2 in the Y direction may be greater than the width of position P3 in the Y direction.

[0063] Figure 4 shows a planar cross-section of the elastic member 91. As shown in Figure 4, portion 91d of the elastic portion 91b is formed in an annular shape. Specifically, portion 91d includes sides 91f and 91g arranged in the X direction. Each of sides 91f and 91g extends in the Y direction. Portion 91d also includes sides 91h and 91i arranged in the Y direction. Each of sides 91h and 91i extends in the X direction. Side 91h connects the Y1 ends of sides 91f and 91g. Side 91i connects the Y2 ends of sides 91f and 91g.

[0064] The elastic portion 91b includes a plurality of portions 91e. Each of the plurality of portions 91e extends in the X direction. Each of the plurality of portions 91e connects edge 91f and edge 91g. The plurality of portions 91e are arranged in the Y direction with spacing between them between edge 91h and edge 91i.

[0065] As shown in Figure 4, each elastic portion 91a is positioned in the space between portions 91e aligned in the Y direction. Also, each elastic portion 91a is positioned in the space between edges 91f and 91g. The elastic portion 91b and each elastic portion 91a may be provided separately (they may be separate bodies). In this case, each elastic portion 91a may be joined (for example, bonded with adhesive) to at least one of the adjacent portions 91e in the Y direction and the adjacent edges 91f (edge ​​91g) in the X direction.

[0066] As described above, in this embodiment, the elastic portion 91a is provided at a position P1 that does not overlap with the gas flow path 88 in the Z direction, and the elastic portion 91b is provided at a position P2 that overlaps with the gas flow path 88 in the Z direction. This makes it possible to suppress the gas flow path 88 from being pressed by the relatively hard (highly rigid) elastic portion 91a of the elastic member 91. As a result, it is possible to suppress the crushing of the gas flow path 88.

[0067] Furthermore, even if the gas passage 88 is crushed, the relatively soft (low rigidity) elastic portion 91b can be expanded by the gas. As a result, obstruction of gas flow can be suppressed.

[0068] [Differentiation] In the above embodiment, an example was shown in which the restraining device 100 is used during the manufacturing process of the energy storage module, but the disclosure is not limited thereto. For example, an energy storage unit (energy storage device) in which the energy storage module is restrained by the restraining device may be mounted on electronic equipment such as an electric vehicle.

[0069] For example, the restraint device 300 shown in Figure 5 includes end plates 310 and 320, insulating films 330 and 340, a bolt 350, and a nut 360. The insulating film 330 is positioned on the lower surface of the end plate 310. The insulating film 340 is positioned on the upper surface of the end plate 320. In Figure 5, for simplification, the end plates 310 and 320 are represented by white blocks. Furthermore, the end plates 310 and 320 are examples of the "pressing members" of this disclosure.

[0070] The laminate 1 is positioned between the insulating film 330 and the insulating film 340. The intervening module 90 is positioned on the lower surface of the insulating film 330 and on the upper surface of the insulating film 340. The positive terminal 400 is connected to the intervening module 90 positioned on the upper surface of the insulating film 340. The negative terminal 500 is connected to the intervening module 90 positioned on the lower surface of the insulating film 330. Each of the positive terminal 400 and the negative terminal 500 is connected to a current collector plate (not shown) included in the intervening module 90.

[0071] The bolt 350 and nut 360 connect the end plate 310 and the end plate 320. The bolt 350 includes a shaft portion 351 and a head 352. The head 352 is provided at the upper end of the shaft portion 351. The head 352 is positioned on the upper surface of the end plate 310. A groove corresponding to the nut 360 is formed in the shaft portion 351.

[0072] The shaft portion 351 of the bolt 350 passes through the through hole 311 formed in the end plate 310 and the through hole 321 formed in the end plate 320. The nut 360 is attached to the lower end of the shaft portion 351 and is positioned on the lower surface of the end plate 320. As a result, the bolt 350 and the nut 360 apply a restraining load in the Z direction to the laminate 1.

[0073] In the above embodiment, an example was shown in which each elastic portion 91a is provided separately from the elastic portion 91b, but the disclosure is not limited thereto. Each elastic portion 91a may be formed integrally with the elastic portion 91b. That is, the elastic member 91 may be a single member including a plurality of elastic portions 91a and elastic portions 91b. In other words, the elastic portions 91a and elastic portions 91b may be formed continuously.

[0074] In the above embodiment, an example was shown in which the elastic portion 91a and the elastic portion 91b are formed from the same material, but the disclosure is not limited thereto. The elastic portion 91b (second elastic portion) may be formed from a material that is softer (less rigid) than the elastic portion 91a (first elastic portion).

[0075] In the above embodiment, an example was shown in which the elastic member 91 is a foamed member, but the disclosure is not limited thereto. The elastic member may be formed from a material different from the foamed member. For example, the elastic member may be formed from silicone rubber or the like. In this case, by adjusting the amount and type of additives to the silicone rubber or the like, a first elastic portion and a second elastic portion that is softer than the first elastic portion may be formed.

[0076] In the above embodiment, an example was shown in which the elastic portion 91b includes portion 91d and portion 91e, but the disclosure is not limited thereto. The elastic portion 91b may include only one of portion 91d and portion 91e.

[0077] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0078] 10, 20, 310, 320 End plate (pressing member), 80 Energy storage module, 81 Electrode plate, 83 Positive terminal electrode plate (electrode plate), 84 Current collector, 85 Positive layer (electrode layer), 85a Adjacent portion, 88 Gas flow path, 88a Gas flow path (first gas flow path), 88b Gas flow path (second gas flow path), 91 Elastic member, 91a Elastic portion (first elastic portion), 91b Elastic portion (second elastic portion), 91c Foaming agent, 91d Portion (first portion), 91e Portion (second portion), 100, 300 Restraining device, P Position (spaced position), P1 Position (first position), P2 Position (second position), P3 Position.

Claims

1. A restraining device for restraining an energy storage module, With the energy storage module restrained, an elastic member is stacked in the stacking direction with the energy storage module, The system comprises a pressing member that presses the elastic member toward the energy storage module, The energy storage module includes electrode plates, The electrode plate is Current collector and, The current collector and the electrode layers stacked in the stacking direction are provided. A gas channel is formed in the electrode layer. The elastic member is The first elastic portion and It includes a second elastic portion that is softer than the first elastic portion, The first elastic portion is provided at a first position that does not overlap with the gas flow path in the stacking direction, The second elastic portion is a restraining device provided at a second position that overlaps with the gas flow path in the stacking direction.

2. The electrode layer has an adjacent portion adjacent to the gas flow path when viewed from a position spaced apart from the electrode plate in the stacking direction, The restraint device according to claim 1, wherein the second elastic portion extends from the second position to a position that overlaps with the adjacent portion in the stacking direction.

3. The aforementioned gas flow path is A first gas flow path extending along the outer peripheral edge of the electrode plate, The electrode plate includes a second gas channel formed on the inner side of the outer peripheral edge, The second elastic portion is viewed from a position spaced apart from the electrode plate in the stacking direction, A first portion extending along the first gas flow path, The restraint device according to claim 1 or 2, comprising a second portion extending along the second gas flow path.

4. The elastic member is a foamed member containing a foaming agent. The restraint device according to claim 1 or 2, wherein the density of the foaming agent in the second elastic portion is higher than the density of the foaming agent in the first elastic portion.

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