Constraint jig and method for manufacturing a power storage module

Abstract

To provide a constraint jig capable of easily constraining a laminate of electrodes laminated in a first direction when manufacturing a power storage module, and a manufacturing method of the power storage module.SOLUTION: A first unit 100 comprises: a pair of constraint members 30 and 30 disposed on both ends of an electrode laminate 10 in a Z-axis direction; and a pair of regulation members 40 and 40 provided on both ends of a held body HB which is configured by including the electrode laminate and the pair of constraint members, in a Y-axis direction. The pair of regulation members include a pair of contact parts 41 and 41 contacted from the outside in the Z-axis direction with edges of the pair of constraint members, and a connection part 42 connecting the pair of contact parts. The size of the connection part in an X-axis direction is equal to or larger than the size of the electrode laminate in an X direction. The relative positions of the pair of regulation members with respect to the pair of constraint members are fixed by an insertion member 36 inserted into through holes of the pair of constraint members and the pair of contact parts.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a restraint jig and a method for manufacturing a power storage module.

Background Art

[0002] Patent Document 1 discloses a method for manufacturing a power storage module (lithium ion secondary battery) in which the manufactured power storage module is sandwiched between a pair of restraint jigs and the pair of restraint jigs are fastened by a plurality of rods and nuts, and various processes such as initial charging and inspection are performed on the battery restrained by the pair of restraint jigs. In such a method for manufacturing a power storage module, after performing various processes, the restraint jig is removed to release the restraint of the power storage module, and the manufacturing of the power storage module is completed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As shown in Patent Document 1 described above, in the manufacturing process of a power storage module, it is necessary to attach and detach a restraint jig to the power storage module every time the power storage module is manufactured. However, in such a manufacturing process of a power storage module, when using a restraint member that restrains the power storage module by fastening and removing a plurality of rods and nuts, if the above-mentioned fastening and removing are performed at a plurality of locations, it takes a lot of man-hours and hinders the improvement of productivity.

[0005] Therefore, an object of the present invention is to provide a restraint jig and a method for manufacturing a power storage module that can easily restrain a laminate of electrodes laminated in a first direction when manufacturing the power storage module.

Means for Solving the Problems

[0006] The restraint jig of the present invention is used during the manufacture of a power storage module including a plurality of electrodes, and is a restraint jig that restrains a laminate in which the plurality of electrodes are laminated in a first direction in the lamination direction. The restraint jig includes a pair of restraint members disposed at both ends of the laminate in the first direction, and a pair of restricting members provided at both ends of the sandwiched body including the laminate and the pair of restraint members in a second direction intersecting the first direction. Each of the pair of restricting members has a pair of contact portions that contact the edges of the pair of restraint members arranged in the first direction so as to sandwich the laminate from the outside in the first direction, and a connecting portion that connects the pair of contact portions. The size of the restricting member in a third direction orthogonal to both the first direction and the second direction is equal to or larger than the size of the laminate in the third direction. In a plan view seen from the first direction, a plurality of through holes that penetrate both the pair of contact portions and the pair of restraint members in the first direction are formed in the pair of contact portions and the pair of restraint members when the pair of restricting members sandwich the sandwiched body. When the pair of restricting members sandwich the sandwiched body, the relative positions of the pair of restricting members with respect to the pair of restraint members are fixed by insertion members inserted into the plurality of through holes.

[0007] In the restraint jig having this configuration, after compressing the laminate in the first direction via the pair of restraint members, the sandwiched body including the compressed laminate is inserted between the pair of contact portions by a simple operation, and the pair of contact portions that regulate the force with which the laminate tends to expand in the first direction can sandwich the sandwiched body. Further, in the restraint jig having this configuration, when the pair of restricting members sandwich the sandwiched body, the relative positions of the pair of restricting members with respect to the pair of restraint members are fixed by a simple operation of inserting the insertion members into the plurality of through holes that penetrate both the pair of contact portions and the pair of restraint members in the first direction, and it is possible to prevent the restraint of the sandwiched body and thus the laminate by the pair of restricting members from being released. As a result, during the manufacture of the power storage module, the laminate of the electrodes laminated in the first direction can be easily restrained.

[0008] In the restraint jig of the present invention, the insertion member may be formed of an insulating resin material. In this configuration, even when a foreign object is generated, for example, when a part of the insertion member is chipped or peeled off when the insertion member is inserted into and removed from the through hole, it is possible to suppress the occurrence of problems such as a short circuit caused by the foreign object.

[0009] In the restraint jig of the present invention, each of the pair of restraint members may have a power connection portion that abuts against the laminate and is electrically connected thereto and to which an external power source is connected. In this configuration, while the laminate is restrained in the stacking direction, charging and discharging of the laminate can be easily performed via the power connection portion of the restraint jig.

[0010] In the restraint jig of the present invention, the regulating member may further have a reinforcing rib that connects the inner surface of the contact portion and the inner surface of the connecting portion, and each of the pair of restraint members may be formed with a notch portion in which the reinforcing rib is disposed when the object to be clamped is clamped by the pair of regulating members. In this configuration, it is possible to improve the strength of the regulating member while avoiding interference between the reinforcing rib formed on the regulating member and the restraint member. As a result, it is possible to suppress an increase in the size of the regulating member.

[0011] In the restraint jig of the present invention, each of the pair of restraint members has a protruding rib that protrudes on the side opposite to the laminate in the first direction, and the protruding rib when the object to be clamped is clamped by the pair of regulating members may protrude to the same height as the contact portion or higher than the contact portion in the first direction. In this configuration, the strength of the restraint member can be improved. Further, when the protruding rib is formed to be the same height as the contact portion or higher than the contact portion in the first direction, the restraint jig is supported by the protruding rib and thus the restraint member located more centrally than the contact portions located at both ends in the second direction, so that the restraint jig that restrains the laminate can be stably placed.

[0012] In the restraint jig of the present invention, at least one of the pair of restraint members may further have an elastic body provided between it and the laminate. Here, in a configuration where the sandwiched body in a compressed state is restrained by a pair of contact portions that contact from the outside in the first direction, that is, when the sandwiched body is restrained to a fixed dimension and the laminate is restrained in the first direction via the restraint members, if the height (thickness) of the laminate in the first direction varies, a uniform restraint pressure cannot be obtained. In this configuration, since an elastic body is provided between the restraint member and the laminate, the variation in the height of the laminate in the first direction can be absorbed by the elastic body, so that the restraint pressure can be made uniform.

[0013] In the method for manufacturing a power storage module of the present invention, a compression step of compressing a sandwiched body including a laminate in which a plurality of electrodes are laminated in a first direction and a pair of restraint members arranged at both ends of the laminate in the first direction, and both ends in a second direction intersecting the first direction of the sandwiched body are provided, and a pair of contact portions that contact from the outside in the first direction at the respective edge portions of the pair of restraint members, and a connection portion that connects the pair of contact portions, and a pair of regulating members having a size in a third direction orthogonal to both the first direction and the second direction that is equal to or greater than the size of the laminate in the third direction are prepared, and the sandwiched body compressed by the compression step is sandwiched by the pair of regulating members, and in a state where the pair of regulating members sandwich the sandwiched body, a restraint step of fixing the relative position of the pair of regulating members with respect to the pair of restraint members by inserting an insertion member into each of a plurality of through holes formed in a plan view as seen from the first direction while penetrating both the pair of contact portions and the pair of restraint members in the first direction.

[0014] In this method, after the operator compresses the laminate in the first direction via a pair of restraining members, the sandwiched body including the compressed laminate can be sandwiched by a pair of contact portions that regulate the force with which the laminate attempts to expand in the first direction by a simple operation of inserting the sandwiched body between the pair of contact portions. Further, in this method, when the pair of regulating members are in a state of sandwiching the sandwiched body, the operator can fix the relative position of the pair of regulating members with respect to the pair of restraining members by a simple operation of inserting an insertion member through a plurality of through holes that penetrate in the first direction through both the pair of contact portions and the pair of restraining members, and can prevent the restraint of the sandwiched body and thus the laminate by the pair of regulating members from being released. As a result, when manufacturing a power storage module, the laminate of electrodes laminated in the first direction can be easily restrained.

Effect of the Invention

[0015] According to the present invention, when manufacturing a power storage module, the laminate of electrodes laminated in the first direction can be easily restrained.

Brief Description of the Drawings

[0016]

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Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and overlapping descriptions are omitted. In the following description, for convenience of explanation, the X-axis direction, the Y-axis direction, and the Z-axis direction that are orthogonal to each other are set.

[0018] The power storage module 1 shown in Fig. 1 is an example of a power storage module manufactured by the method for manufacturing a power storage module of the present embodiment. The power storage module 1 is used, for example, as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage module 1 is a secondary battery such as a lithium-ion secondary battery or a nickel-metal hydride secondary battery, for example. The power storage module 1 may be an electric double layer capacitor. In the present embodiment, the case where the power storage module 1 is a lithium-ion secondary battery is exemplified. The power storage module 1 of the present embodiment is a flat large-sized battery having a width of one side along the X-axis direction and the Y-axis direction of 1000 mm or more and a thickness along the Z-axis direction of 100 mm or less, for example.

[0019] The power storage module 1 includes an electrode laminate 10, a sealing portion 20, and an electrolytic solution 19. The electrode laminate 10 has a plurality of bipolar electrodes (electrodes) 11, a negative terminal electrode (electrode) 12, a positive terminal electrode (electrode) 13, and a plurality of separators 14.

[0020] Each bipolar electrode 11 has a current collector 15, a positive electrode active material layer 16, and a negative electrode active material layer 17. The current collector 15 is formed, for example, in a sheet shape. The current collector 15 is formed, for example, in a rectangular shape when viewed from the Z-axis direction. The positive electrode active material layer 16 is provided on the first surface 15a of the current collector 15. The positive electrode active material layer 16 is formed, for example, in a rectangular shape when viewed from the Z-axis direction. The negative electrode active material layer 17 is provided on the second surface 15b of the current collector 15. The negative electrode active material layer 17 is formed, for example, in a rectangular shape when viewed from the Z-axis direction. The first surface 15a of the current collector 15 is a surface facing one side in the Z-axis direction, and in the example of Fig. 1, it faces the positive side in the Z-axis direction. The second surface 15b of the current collector 15 is a surface facing the other side in the Z-axis direction, and in the example of Fig. 1, it faces the negative side in the Z-axis direction.

[0021] The negative electrode active material layer 17 is slightly larger than the positive electrode active material layer 16 when viewed from the Z-axis direction. That is, in a plan view when viewed from the Z-axis direction, the entire formation region of the positive electrode active material layer 16 is located within the formation region of the negative electrode active material layer 17. The plurality of bipolar electrodes 11 are stacked along the Z-axis direction such that the positive electrode active material layer 16 and the negative electrode active material layer 17 face each other. That is, the stacking direction D of the plurality of bipolar electrodes 11 is stacked along the Z-axis direction.

[0022] The negative electrode terminal electrode 12 has a current collector 15 and a negative electrode active material layer 17. The negative electrode terminal electrode 12 does not have a positive electrode active material layer 16. That is, an active material layer is not provided on the first surface 15a of the current collector 15 of the negative electrode terminal electrode 12. The first surface 15a of the current collector 15 of the negative electrode terminal electrode 12 is exposed. The negative electrode terminal electrode 12 is disposed at the first end in the Z-axis direction of the electrode laminate 10. The negative electrode active material layer 17 of the negative electrode terminal electrode 12 faces the positive electrode active material layer 16 of the bipolar electrode 11 located closer to the first end in the Z-axis direction of the electrode laminate 10. The first end in the Z-axis direction of the electrode laminate 10 is the positive-side end in the Z-axis direction in the example of FIG. 1.

[0023] The positive electrode terminal electrode 13 has a current collector 15 and a positive electrode active material layer 16. The positive electrode terminal electrode 13 does not have a negative electrode active material layer 17. That is, an active material layer is not provided on the second surface 15b of the current collector 15 of the positive electrode terminal electrode 13. The second surface 15b of the current collector 15 of the positive electrode terminal electrode 13 is exposed. The positive electrode terminal electrode 13 is disposed at the second end in the Z-axis direction of the electrode laminate 10. The positive electrode active material layer 16 of the positive electrode terminal electrode 13 faces the negative electrode active material layer 17 of the bipolar electrode 11 located closer to the second end in the Z-axis direction of the electrode laminate 10. The second end in the Z-axis direction of the electrode laminate 10 is the negative-side end in the Z-axis direction in the example of FIG. 1.

[0024] The separator 14 is disposed between adjacent bipolar electrodes 11, 11, between the negative terminal electrode 12 and the bipolar electrode 11, and between the positive terminal electrode 13 and the bipolar electrode 11. The separator 14 is interposed between the positive electrode active material layer 16 and the negative electrode active material layer 17. By isolating the positive electrode active material layer 16 and the negative electrode active material layer 17, the separator 14 prevents a short circuit due to contact between adjacent electrodes while allowing charge carriers such as lithium ions to pass through.

[0025] The current collector 15 is a chemically inert electrical conductor for continuously passing an electric current through the positive electrode active material layer 16 and the negative electrode active material layer 17 during discharge or charging of the lithium ion secondary battery. The material of the current collector 15 is, for example, a metal material, a conductive resin material, or a conductive inorganic material. Examples of the conductive resin material include a conductive polymer material or a resin obtained by adding a conductive filler to a non-conductive polymer material as needed. The current collector 15 may include a plurality of layers. In this case, each layer of the current collector 15 may contain the above metal material or conductive resin material.

[0026] A coating layer may be formed on the surface of the current collector 15. The coating layer may be formed by a known method such as plating or spray coating. The current collector 15 may be formed, for example, in a plate shape, a foil shape (e.g., a metal foil), a film shape, or a mesh shape. Examples of the metal foil include aluminum foil, copper foil, nickel foil, titanium foil, or stainless steel foil. Examples of the stainless steel foil include SUS304, SUS316, or SUS301 defined in JIS G 4305:2015. By using a stainless steel foil as the current collector 15, the mechanical strength of the current collector 15 can be ensured. The current collector 15 may be an alloy foil or a clad foil of the above metals. When the current collector 15 is formed in a foil shape, the thickness of the current collector 15 may be, for example, 1 μm to 100 μm.

[0027] The positive electrode active material layer 16 contains a positive electrode active material capable of occluding and releasing charge carriers such as lithium ions. Examples of the positive electrode active material include lithium composite metal oxides having a layered rock salt structure, metal oxides having a spinel structure, polyanion-based compounds, and the like. The positive electrode active material may be any material that can be used in a lithium ion secondary battery. The positive electrode active material layer 16 may contain a plurality of positive electrode active materials. In the present embodiment, the positive electrode active material layer 16 contains olivine-type lithium iron phosphate (LiFePO4) as a composite oxide.

[0028] The negative electrode active material layer 17 contains a negative electrode active material capable of occluding and releasing charge carriers such as lithium ions. The negative electrode active material may be any of a single substance, an alloy, or a compound. Examples of the negative electrode active material include lithium, carbon, metal compounds, and the like. The negative electrode active material may be an element capable of alloying with lithium or a compound thereof. Examples of carbon include natural graphite, artificial graphite, hard carbon (carbon with low graphitization property), or soft carbon (carbon with high graphitization property). Examples of artificial graphite include highly oriented graphite, mesocarbon microbeads, and the like. Examples of elements capable of alloying with lithium include silicon or tin. In the present embodiment, the negative electrode active material layer 17 contains graphite as a carbon-based material.

[0029] Each of the positive electrode active material layer 16 and the negative electrode active material layer 17 (hereinafter, also simply referred to as the "active material layer") may further contain a conductive assistant, a binder, an electrolyte (polymer matrix, ion-conductive polymer, electrolyte solution 19, etc.), an electrolyte supporting salt (lithium salt, etc.) for enhancing ion conductivity, etc., as necessary. The conductive assistant is added to enhance the conductivity of each of the electrodes 11, 12, 13. The conductive assistant is, for example, acetylene black, carbon black, or graphite.

[0030] The components contained in the active material layer, the mixing ratio of the components, or the thickness of the active material layer are not particularly limited, and conventionally known knowledge about lithium ion secondary batteries can be appropriately referred to. The thickness of the active material layer is, for example, 2 to 150 μm. The active material layer may be formed on the surface of the current collector 15 by a known method such as a roll coating method. A heat-resistant layer may be provided on the surface (one side or both sides) of the current collector 15 or the surface of the active material layer in order to improve the thermal stability of each electrode 11, 12, 13. The heat-resistant layer contains, for example, inorganic particles and a binder, and may also contain additives such as a thickening agent, among others.

[0031] Examples of the binder include fluorine-containing resins such as polyvinylidene fluoride, polytetrafluoroethylene, and fluororubber, thermoplastic resins such as polypropylene and polyethylene, imide resins such as polyimide and polyamideimide, alkoxysilyl group-containing resins, acrylic resins such as acrylic acid or methacrylic acid, styrene-butadiene rubber (SBR), carboxymethyl cellulose, alginates such as sodium alginate and ammonium alginate, water-soluble cellulose ester cross-linked products, starch-acrylic acid graft polymers, and the like. These binders can be used alone or in combination. Examples of the solvent include water, N-methyl-2-pyrrolidone (NMP), and the like.

[0032] The separator 14 may be, for example, a porous sheet or non-woven fabric containing a polymer that absorbs and retains an electrolyte. Examples of the material of the separator 14 include, for example, polypropylene, polyethylene, polyolefin, polyester, and the like. The separator 14 may have a single-layer structure or a multilayer structure. The multilayer structure may have, for example, an adhesive layer or a ceramic layer as a heat-resistant layer. The separator 14 may be impregnated with an electrolyte. The separator 14 may be composed of an electrolyte such as a polymer electrolyte or an inorganic-type electrolyte. Examples of the electrolyte impregnated in the separator 14 include a liquid electrolyte (electrolyte solution 19) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent, or a polymer gel electrolyte containing an electrolyte held in a polymer matrix.

[0033] The separator 14 may be, for example, a porous sheet or nonwoven fabric containing a polymer that absorbs and retains an electrolyte. Examples of materials for the separator 14 include, for example, polypropylene, polyethylene, polyolefin, polyester, and the like. The separator 14 may have a single-layer structure or a multilayer structure. The multilayer structure may have, for example, an adhesive layer or a ceramic layer as a heat-resistant layer. The separator 14 may be impregnated with an electrolyte. Examples of the electrolyte impregnated in the separator 14 include a liquid electrolyte (electrolyte solution 19) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.

[0034] The sealing portion 20 is formed at the peripheral edge of the electrode laminate 10 so as to surround the electrode laminate 10. The sealing portion 20 is joined to each of the first surface 15a and the second surface 15b of each current collector 15 at the peripheral edge of each current collector 15. Note that the sealing portion 20 may be joined to at least one of the first surface 15a and the second surface 15b of each current collector 15. The sealing portion 20 seals the spaces S between the current collectors 15, 15 of the adjacent bipolar electrodes 11, 11, between the current collector 15 of the negative terminal electrode 12 and the current collector 15 of the bipolar electrode 11, and between the current collector 15 of the positive terminal electrode 13 and the current collector 15 of the bipolar electrode 11. Hereinafter, the spaces between the current collectors 15, 15 of the adjacent bipolar electrodes 11, 11, between the current collector 15 of the negative terminal electrode 12 and the current collector 15 of the bipolar electrode 11, and between the current collector 15 of the positive terminal electrode 13 and the current collector 15 of the bipolar electrode 11 are simply referred to as "between adjacent electrodes 11, 12, 13".

[0035] The sealing portion 20 is rectangular frame-shaped when viewed from the stacking direction D of the electrodes 11, 12, 13. The sealing portion 20 has a portion located between adjacent electrodes 11, 12, 13 and a portion located outside the edge of the current collector 15. Between adjacent electrodes 11, 12, 13, the sealing portion 20 surrounds the periphery of the positive electrode active material layer 16 and the negative electrode active material layer 17, and the space S is formed by the adjacent current collectors 15, 15 and the sealing portion 20.

[0036] The space S contains the electrolytic solution 19. The sealing portion 20 seals the electrolytic solution 19 in the space S. The sealing portion 20 can prevent moisture from entering the space S from the outside of the power storage module 1. Further, the sealing portion 20 prevents, for example, gas generated from each of the electrodes 11, 12, 13 due to charge and discharge reactions or the like from leaking to the outside of the power storage module 1. A part of the sealing portion 20 is disposed between the adjacent current collectors 15, 15, and also functions as a spacer for maintaining the interval between the pair of current collectors 15, 15. The sealing portion 20 is spaced apart from the positive electrode active material layer 16 and the negative electrode active material layer 17 when viewed from the stacking direction D. When viewed from the stacking direction D, the portion located outside the edge of the current collector 15 extends in the stacking direction D from the negative electrode terminal electrode 12 disposed at one end of the electrode stack 10 in the stacking direction D to the positive electrode terminal electrode 13 disposed at the other end of the stacking direction D, and connects each of the portions located between the current collectors 15, 15 of the adjacent electrodes 11, 12, 13.

[0037] The sealing portion 20 contains an insulating material and prevents a short circuit between the adjacent current collectors 15, 15 by insulating between the adjacent current collectors 15, 15. Examples of the material constituting the sealing portion 20 include resin materials such as polypropylene, polyethylene, polystyrene, ABS resin, and AS resin, and those obtained by modifying these resin materials.

[0038] The sealing portion 20 includes a main body portion 21 that covers the sides of the electrode laminate 10 (both end portions in the X-axis direction and both end portions in the Y-axis direction of the electrode laminate 10), and a pair of protruding portions 22 that protrude from the main body portion 21 in the Z-axis direction. The protruding portions 22 are provided at the upper and lower ends of the portion of the main body portion 21 where the opening 20b is formed. As shown in FIGS. 1 and 2, a plurality of openings 20b for supplying the electrolytic solution 19 to each space S are formed in the sealing portion 20 in the manufacturing process of the power storage module 1. The openings 20b communicate the inside and outside of each space S and open in a direction orthogonal to the stacking direction D. Specifically, the plurality of openings 20b open in the side surface 20a that extends along the stacking direction D of the sealing portion 20. The openings 20b communicating with each space S are arranged so that the openings 20b, 20b formed in the spaces S adjacent to each other in the stacking direction D are separated from each other in a direction (Y-axis direction) orthogonal to both the stacking direction D and the X-axis direction so as not to overlap in the stacking direction D.

[0039] On the other hand, some of the openings 20b communicating with the spaces S that are not adjacent to each other in the stacking direction D are arranged so that their positions in the Y-axis direction coincide with each other so as to overlap in the stacking direction D. In the present embodiment, six spaces S are formed in the power storage module 1, and three openings 20b respectively communicating with three spaces S arranged at odd-numbered positions when counted from one end in the stacking direction D are arranged so as to overlap with each other in the stacking direction D. Then, three openings 20b respectively communicating with three spaces S arranged at even-numbered positions when counted from one end in the stacking direction D are arranged so as to overlap with each other in the stacking direction D, separated from the three openings 20b in the Y-axis direction.

[0040] On the side surface 20a of the sealing portion 20 provided with the openings 20b, a frame portion 20c protruding from the side surface 20a so as to surround each opening 20b is formed. Among the plurality of frame portions 20c, the frame portions 20c surrounding the openings 20b arranged so as to overlap in the stacking direction D are connected to each other to form a frame portion connecting body 20d. In the sealing portion 20 of the present embodiment, a frame portion connecting body 20d in which three frame portions 20c surrounding the three openings 20b that are odd-numbered when counted from one end in the stacking direction D are connected to each other, and a frame portion connecting body 20d in which three frame portions 20c surrounding the three openings 20b that are even-numbered when counted from one end in the stacking direction D are connected to each other are configured. In addition, in FIG. 2, the frame portion 20c and the frame portion connecting body 20d are shown emphasized by cross-hatching.

[0041] A sealing sheet 25 is provided at the tip of each frame portion 20c (frame portion connecting body 20d) in the protruding direction (X-axis direction). The sealing sheet 25 is joined over the entire circumference of the tip of each frame portion 20c to cover and seal the opening 20b surrounded by each frame portion 20c. In addition, FIG. 2 shows the power storage module 1 in a state where the sealing sheet 25 is omitted.

[0042] Next, an example of the manufacturing method of the power storage module 1 will be described mainly with reference to FIG. 3. First, by laminating each of the electrodes 11, 12, and 13, an electrode laminate 10 (laminate) before the openings 20b of the power storage module 1 shown in FIG. 1 are sealed is prepared (laminating step S1). At this point, the sealing sheet 25 is not provided at the tip of each frame portion 20c, and each opening 20b is open and exposed on the side surface 20a. In the following description, for convenience, the electrode laminate 10 before the openings 20b are sealed may be simply referred to as the electrode laminate 10.

[0043] Subsequently, with the lamination direction D of the electrodes along the Z-axis direction (vertical direction), one of the pair of restraint members 30, 30 that constitutes the first unit 100 (restraint jig) (see FIGS. 4 to 7), which will be described in detail later, is placed on the electrode laminate 10 (placement step S2). Hereinafter, the direction along the vertical direction is defined as the Z-axis direction (first direction), the direction perpendicular to the Z-axis direction and along the horizontal direction is defined as the X-axis direction (third direction), and the direction perpendicular to both the Z-axis direction and the X-axis direction and along the horizontal direction is defined as the Y-axis direction (second direction) for explanation.

[0044] Subsequently, the first unit 100 that restrains the electrode laminate 10 with a predetermined pressure in the Z-axis direction is attached to the electrode laminate 10 (restraint step S3). More specifically, first, the other restraint member 30 of the pair of restraint members 30, 30 is placed on the electrode laminate 10 placed on one of the pair of restraint members 30, 30 to form a sandwiched body HB in which the electrode laminate 10 is sandwiched by the pair of restraint members 30, 30. Subsequently, the sandwiched body HB is compressed in the Z-axis direction (compression step), and the compressed sandwiched body HB is sandwiched by the pair of restricting members 40, 40. Note that the method of attaching the pair of restricting members 40, 40 to the sandwiched body HB will be described in detail later.

[0045] The compressed sandwiched body HB attempts to expand in the Z-axis direction, and its expansion is restricted by the pair of restricting members 40, 40. That is, the sandwiched body HB is restrained in a state of being compressed in the lamination direction D by the pair of restricting members 40, 40. Further, in the restraint step S3, the pair of restraint members 30, 30 are attached to the electrode laminate 10 such that one side surfaces 30e, 30e of the pair of restraint members 30, 30 and the side surface 20a of the electrode laminate 10 where the opening 20b is formed are flush.

[0046] Subsequently, a second unit 200 is prepared, which has a first connection part 63, a second connection part 72, and flow paths 61a, 62a, 63a, 71 that communicate the first connection part 63 and the second connection part 72, as shown in FIG. 8. Then, the flow path part 60 is connected to the opening 20b of the electrode laminate 10 placed in the placement step S2 such that the connection part of the second connection part 72 to the connected part 110 is located above the connection part of the first connection part 63 to the opening 20b in the Z-axis direction (connection step S4). In the connection step S4, the first connection part 63 is pressed against the electrode laminate 10, whereby the first connection part 63 is connected to the opening 20b. In the connection step S4, the second unit 200 is attached to the first unit 100, whereby the flow path part 60 (first connection part 63) is connected to the opening 20b of the electrode laminate 10. The attachment procedure of the second unit 200 to the first unit 100 will be described in detail later.

[0047] Subsequently, the tip 113 (connected part 110) of the supply pipe 120 of the electrolytic solution 19 is connected to the second connection part 72, and the electrolytic solution 19 is supplied to the space S of the electrode laminate 10 via the second unit 200 (supply step S5). When the supply of the electrolytic solution 19 to the space S is completed, the tip 113 of the supply pipe 120 is removed from the second connection part 72. Next, the electrode laminate 10 placed on one of the restraining members 30 such that the lamination direction D is along the Z-axis direction is transported to the location where the next process is to be performed (transport step S6). The electrode laminate 10 is transported with the first unit 100 and the second unit 200 attached, that is, with the first connection part 63 of the second unit 200 connected to the opening 20b of the electrode laminate 10.

[0048] Incidentally, when a valve for opening and closing the communication between the outside and the flow path 71 is provided at the second connection portion 72 (not shown), when the tip portion 113 of the supply pipe 120 is removed from the second connection portion 72, the valve may be closed. As such a valve, a one-touch coupling that is in an open state when the connected portion 110 is connected and is in a closed state when the connected portion 110 is removed can be used. Further, the second connection portion 72 may be provided with a check valve. With these configurations, it is possible to surely prevent the electrolytic solution 19 from leaking from the second connection portion 72 and to prevent foreign matters and the like from entering the flow path 71 and thus the electrode laminate 10 from the second connection portion 72.

[0049] Subsequently, at a predetermined location conveyed in the conveying step S6, the electrode laminate 10 in a state where the first unit 100 and the second unit 200 are attached is accommodated in the charge and discharge device. The electrode laminate 10 accommodated in the charge and discharge device is charged and activated by an external power source via the restraint members 30, 30 (power connection portions 34, 34) (activation step S7). In the activation step S7, the gas generated in the space S of the electrode laminate 10 due to activation is discharged through the second connection portion 72. That is, the gas discharged from the opening 20b of the electrode laminate 10 is discharged from the second connection portion 72 via the first connection portion 63 and the flow paths 61a, 62a, 63a, 71. In the activation step S7 of the present embodiment, a connection portion (connected portion 110) of a gas bag that collects gas is connected to the second connection portion 72. As the gas bag, for example, a bag made of resin is used.

[0050] Subsequently, after changing the posture of the electrode laminate 10 so that the opening 20b of the electrode laminate 10 faces vertically upward, the second unit 200 is removed from the first unit 100. That is, the first connection portion 63 is removed from the opening 20b of the electrode laminate 10. Thereby, the side surface 20a and the opening 20b of the sealing portion 20 are exposed. Subsequently, the opening 20b is sealed (sealing step S8). The sealing of the opening 20b is performed, for example, by thermally welding a sealing sheet 25 to the tip of a frame portion 20c surrounding each opening 20b. Subsequently, the first unit 100 that restrains the electrode laminate 10 is removed from the electrode laminate 10 (release step S9).

[0051] Next, the jig J used in a series of steps in the manufacturing method of the above-described power storage module 1 will be described in detail. As shown in FIG. 4, the jig J includes a first unit 100 and a second unit 200. The second unit 200 is detachably provided on the first unit 100.

[0052] The first unit 100 restrains the electrode laminate 10 in which a plurality of electrodes are laminated in the Z-axis direction (first direction) while applying a restraining load in the Z-axis direction. As shown in FIGS. 4 to 6, the first unit 100 includes a pair of restraining members 30, 30, a pair of regulating members 40, 40, and an insertion member 36. The pair of restraining members 30, 30 are arranged at both ends of the electrode laminate 10 in the Z-axis direction (lamination direction). Each of the pair of restraining members 30, 30 is formed of a material such as stainless steel, aluminum, or iron, for example. Each of the pair of restraining members 30, 30 has a main body portion 31, an elastic body 33, and a power supply connection portion 34.

[0053] The main body portion 31 has an inner surface 31a on the side of the electrode laminate 10 and an outer surface 31b on the side opposite to the inner surface 31a. The main body portion 31 has a protruding rib 32 that protrudes outward from the outer surface 31b toward the outside of the electrode laminate 10. The protruding rib 32 is provided to improve the strength of the restraining member 30. When the object to be clamped HB is clamped by the regulating member 40 described in detail later, the protruding rib 32 protrudes from the outer surface 31b so as to be at the same height as the contact portion 41 of the regulating member 40 or higher than the contact portion 41 in the Z-axis direction. The object to be clamped HB refers to a laminate composed of the electrode laminate 10 and a pair of restraining members 30, 30 arranged at both ends in the Z-axis direction. In the present embodiment, the protruding rib 32 and the contact portion 41 are formed to be flush. Thereby, the first unit 100 in a state of clamping the object to be clamped HB can be placed on a flat portion in a stable state.

[0054] The elastic body 33 is fixed to the inner surface 31a of the main body 31. Examples of the elastic body 33 include an insulating rubber member or a disc spring. When fixing the rubber member, it is formed so that the size in plan view seen from the Z-axis direction is equal to the size of the main body 31 in plan view. When the disc spring has conductivity, an insulating sheet member is arranged between the disc spring and the main body 31, or the inner surface 31a of the main body 31 is coated with an insulating material. Further, a conductive power connection portion 34 used for charging and discharging in the activation step S7 may be fixed to the elastic body 33. That is, the power connection portion 34 is fixed to the surface of the elastic body 33 opposite to the main body 31. When the clamping member 30 clamps the clamped body HB, the elastic body 33 and the power connection portion 34 are provided between the main body 31 and the electrode laminate 10 in the Z-axis direction. In this embodiment, an example in which the elastic body 33 is provided on each of the pair of clamping members 30, 30 has been described, but it may be arranged on only one of the pair of clamping members 30, 30.

[0055] Each of the pair of clamping members 30, 30 is formed in a rectangular shape, and insertion holes (through holes) 31c through which the insertion members 36 are inserted are formed at the four corners thereof. Notches 37 into which the reinforcing ribs 43 of the restricting member 40 to be described in detail later are inserted are formed on each of the two sides of the clamping member 30 that face each other in the Y-axis direction. That is, the notches 37 are provided corresponding to the number and formation positions of the reinforcing ribs 43 provided on the restricting member 40.

[0056] A fixing portion 35 for detachably attaching the first unit 100 and the second unit 200 is formed on each of the pair of clamping members 30, 30. The fixing portion 35 includes overhanging portions 35a, 35a that project in the X-axis direction, which is the detaching direction, of the pair of clamping members 30, 30, and insertion holes 35b, 35b formed in each of the overhanging portions 35a, 35a. The procedure for attaching and detaching the first unit 100 and the second unit 200 via the fixing portion 35 will be described in detail later.

[0057] The pair of restricting members 40, 40 sandwich both ends of the sandwiched body HB in the Y-axis direction (second direction) orthogonal (intersecting) to the Z-axis direction (first direction) in a state compressed in the Z-axis direction. Each of the pair of restricting members 40, 40 is formed of, for example, the same material as the restraining member 30. Each of the pair of restricting members 40, 40 has a pair of contact portions 41, 41, a connecting portion 42, and a reinforcing rib 43.

[0058] The pair of contact portions 41, 41 contact the respective pair of main body portions 31, 31 of the sandwiched body HB from the outside in the Z-axis direction and are formed in a plate shape orthogonal to the Z-axis direction. The size of the contact portion 41 in the X-axis direction (third direction) is the same as or longer than the size of the electrode laminate 10 in the X-axis direction. Also, the size of the contact portion 41 in the X-axis direction is the same as the size of the restraining member 30 of the sandwiched body HB in the X-axis direction. The contact portion 41 has an inner surface 41a that contacts the outer surface 31b of the main body portion 31 and an outer surface 41b on the side opposite to the inner surface 41a. Further, the pair of contact portions 41, 41 are formed with insertion holes (through holes) 41c through which the insertion member 36 is inserted. Two insertion holes 41c are formed near the ends of the contact portion 41 in the X-axis direction.

[0059] The connecting portion 42 connects the pair of contact portions 41, 41 and is formed in a plate shape orthogonal to the Y-axis direction. The size of the connecting portion 42 in the X-axis direction is the same as or longer than the size of the electrode laminate 10 in the X-axis direction. Also, the size of the connecting portion 42 in the X-axis direction is the same as the sizes of the restraining member 30 and the contact portion 41 of the sandwiched body HB in the X-axis direction. The shape of the restricting member 40 composed of the pair of contact portions 41, 41 and the connecting portion 42 is in a U-shape (U-shaped) when viewed from the X-axis direction.

[0060] The reinforcing rib 43 is a plate-shaped part that connects the contact part 41 and the connecting part 42 and is formed in a triangular shape when viewed from the X-axis direction. The reinforcing rib 43 is provided to reinforce the strength of the regulating member 40. The reinforcing rib 43 is disposed (inserted) in the notch 37 formed in the restraining member 30 when the object HB is clamped by the regulating member 40.

[0061] The insertion member 36 is a rod-shaped member that is inserted into the insertion hole 31c of the restraining member 30 and the insertion hole 41c of the regulating member 40. More specifically, in a state where a pair of regulating members 40, 40 clamp the object HB, a pair of contact parts 41, 41 and a pair of restraining members 30, 30 are provided with through holes (i.e., insertion holes 31c and insertion holes 41c) that penetrate both the pair of contact parts 41, 41 and the pair of restraining members 30, 30 in the Z-axis direction. Four (a plurality of) such through holes are formed in a plan view when viewed from the Z-axis direction. The insertion member 36 is inserted into each of the plurality of through holes in a state where a pair of regulating members 40, 40 clamp the object HB.

[0062] The insertion member 36 is formed of an engineering plastic such as polyacetal, polyetheretherketone, or polyamide. In a state where a pair of regulating members 40, 40 clamp the object HB, if the insertion member 36 is inserted into each of the plurality of through holes (i.e., the insertion hole 31c and the insertion hole 41c), the relative positions of the pair of regulating members 40, 40 with respect to the pair of restraining members 30, 30 are fixed. In other words, in a state where the object HB including the restraining member 30 is clamped by the pair of regulating members 40, 40, if the insertion member 36 is inserted into the insertion hole 31c of the restraining member 30 and the insertion hole 41c of the regulating member 40, the regulating member 40 is positioned with respect to the restraining member 30.

[0063] Here, in the restraining step S3, a procedure for restraining the electrode laminate 10 using the first unit 100 will be described. The above-described electrode laminate 10 is compressed via a pair of restraining members 30, 30 disposed at both ends in the Z-axis direction to form a sandwiched body HB. Note that the size of the height (thickness) of the sandwiched body HB in the Z-axis direction before compression is longer than the distance between a pair of contact portions 41, 41 of the regulating member 40 in the Z-axis direction. Also, the size of the height of the sandwiched body HB in the Z-axis direction after compression is shorter than the distance between a pair of contact portions 41, 41 of the regulating member 40 in the Z-axis direction. Next, the above-described pair of regulating members 40, 40 are prepared.

[0064] Next, the compressed sandwiched body HB is clamped by the above-described pair of regulating members 40, 40. More specifically, the sandwiched body HB in a state compressed in the Z-axis direction is inserted between a pair of contact portions 41, 41 of the pair of regulating members 40, 40 such that respective reinforcing ribs 43 of the pair of regulating members 40 are inserted into respective notches 37 of the pair of restraining members 30, 30. Then, the compression of the sandwiched body HB is released. Thereby, the extension of the sandwiched body HB in the Z-axis direction when the compression is released is regulated by the pair of regulating members 40. The sandwiched body HB is firmly clamped by the pair of regulating members 40 and maintained in a state of being restrained in the Z-axis direction.

[0065] In the first unit 100 of the present embodiment, the respective contact portions 41, 41 of the pair of regulating members 40, 40 are formed to be line-symmetric with respect to the respective edges of the pair of restraining members 30, 30 with a line along the X-axis direction as the axis of symmetry so that a load is evenly applied to the entire sandwiched body HB. Also, the overall shape of each of the pair of restraining members 30, 30 is formed such that, for example, the outer dimensions, thickness, rib arrangement, rib shape, etc. are the same as each other. Thereby, a load can be evenly applied to the entire electrode laminate 10.

[0066] Next, the second unit 200 will be described in detail. As shown in FIGS. 4, 5, and 8, the second unit 200 is pressed against the frame connecting body 20d formed on the electrode laminate 10 and connected to each of the openings 20b, thereby communicating each space S formed in the electrode laminate 10 with the connected portion 110. Examples of the connected portion 110 include the tip portion 113 of the supply pipe 120 of the electrolytic solution 19 connected in the supply step S5, the connection portion (not shown) of the exhaust pipe of the gas generated in the space S connected in the activation step S7, or the connection portion of the gas bag that collects the gas. The second unit 200 includes a base portion 51 and a flow path portion 60.

[0067] The base portion 51 supports the flow path portion 60. The flow path portion 60 communicates with the space S by being connected to the opening 20b of the electrode laminate 10. The flow path portion 60 is provided corresponding to the number of the frame connecting bodies 20d formed on the electrode laminate 10. In the present embodiment, an example in which two flow path portions 60 are provided in the second unit 200 will be described. For convenience of explanation, in FIGS. 4, 5, 6, 11, and 14(A), illustration of the specific number of the frame connecting bodies 20d and the number of the openings 20b is omitted.

[0068] The base portion 51 includes a first base portion 52 and a second base portion 53. The first base portion 52 and the second base portion 53 sandwich the flow path portion 60 and support the flow path portion 60 detachably. The flow path portion 60 includes a main body pipe 61, a nozzle 62, a first connection portion 63, an elastic portion 67, a mounting portion 68, and a connection member 70.

[0069] The main body tube 61 is a tube member extending in the X-axis direction and having a plurality of flow paths 61a for allowing a medium (e.g., the electrolytic solution 19) to flow between the space S of the electrode laminate 10 and the connected portion 110 when connected to the opening 20b of the electrode laminate 10. The nozzle 62 is attached to the tip of the main body tube 61, and a plurality of flow paths 62a communicating with the respective flow paths 61a of the main body tube 61 are formed. At the tip of the nozzle 62 (the end on the side opposite to the side where the main body tube 61 is attached in the X-axis direction), a first connection portion 63 for liquid-tightly connecting the opening 20b of the electrode laminate 10 and the flow path portion 60 (flow paths 61a, 62a, 63a, 71) is fixed.

[0070] The first connection portion 63 is formed of a material having elasticity such as ethylene propylene rubber or fluororubber. As shown in FIG. 9(C), the first connection portion 63 is attached to the nozzle 62 by a gripping portion 62E. The first connection portion 63 is formed in a shape that can be attached to the nozzle 62 by the gripping portion 62E. Specifically, the first connection portion 63 has a portion 63e that protrudes from the tip of the nozzle 62 and extends toward the base end (main body tube 61 side) of the nozzle 62 in the X-axis direction. The gripping portion 62E grips the extending portion 63e of the first connection portion 63 by screwing or clamping. By adopting the gripping portion 62E having such a configuration, the relatively thin first connection portion 63 in the X-axis direction can be attached to the nozzle 62. The relatively thin first connection portion 63 in the X-axis direction requires a small amount of deformation when pressed against the electrode laminate 10, and the durability of the first connection portion 63 can be improved. The gripping portion 62E is formed at a position separated from the tip of the nozzle 62 in the X-axis direction. In this configuration, when connecting the first connection portion 63 to the opening 20b of the electrode laminate 10, it is possible to prevent the gripping portion 62E from interfering with the electrode laminate 10.

[0071] As shown in FIGS. 9(A), 9(B), 9(C), and 10(A), the first connection portion 63 is formed with a plurality of flow paths 63a communicating with the respective flow paths 62a. The plurality of flow paths 61a, 62a, and 63a are provided corresponding to the number of openings 20b surrounded by the respective frame portions 20c of the frame portion connecting body 20d. In the flow path portion 60 of the present embodiment, three flow paths 61a, 62a, and 63a are provided for each frame portion connecting body 20d. The plurality of flow paths 61a, 62a, and 63a are arranged along the Z-axis direction so as to correspond to the positions of the openings 20b in the frame portion connecting body 20d.

[0072] Returning to FIGS. 4, 5, and 8, the attachment portion 68 supports the main body pipe 61. More specifically, the main body pipe 61 is inserted into the through hole of the attachment portion 68, and the attachment portion 68 supports the main body pipe 61 so as to be movable in the extending direction of the main body pipe 61. The attachment portion 68 is a quadrangular columnar member and is detachably attached to the first base portion 52 and the second base portion 53. On the side surface of the attachment portion 68 facing the electrode laminate 10 in the X-axis direction, there is a spring-like elastic portion 67 provided from the side surface to the nozzle 62. The elastic portion 67 supports the first connection portion 63 (nozzle 62) in a state of urging it so that the first connection portion 63 protrudes in the X-axis direction from the first base portion 52 and the second base portion 53 when viewed from the Z-axis direction in a state where the first connection portion 63 is not pressed against the electrode laminate 10. When the first connection portion 63 is pressed against the electrode laminate 10, the main body pipe 61 and the nozzle 62 move toward the attachment portion 68 side in the X-axis direction (the extending direction of the main body pipe 61). At this time, the elastic portion 67 is compressed between the nozzle 62 and the attachment portion 68, and urges the nozzle 62 and the first connection portion 63 against the electrode laminate 10. An insertion hole 52a is formed in the first base portion 52, an insertion hole 53a is formed in the second base portion 53, and a pair of insertion holes 68a, 68a are formed in the attachment portion 68.

[0073] The first base portion 52 and the attachment portion 68 are fixed by inserting an insertion member 69 inserted through the insertion hole 52a of the first base portion 52 into one insertion hole 68a of the attachment portion 68. The first base portion 52 and the attachment portion 68 are separated by pulling out the insertion member 69 inserted through the insertion hole 52a of the first base portion 52 from one insertion hole 68a of the attachment portion 68. Similarly, the second base portion 53 and the attachment portion 68 are fixed by inserting an insertion member 69 inserted through the insertion hole 53a of the second base portion 53 into the other insertion hole 68a of the attachment portion 68. The second base portion 53 and the attachment portion 68 are separated by pulling out the insertion member 69 inserted through the insertion hole 53a of the second base portion 53 from the other insertion hole 68a of the attachment portion 68.

[0074] Fixing portions 55 for detachably attaching the first unit 100 and the second unit 200 are formed on the first base portion 52 and the second base portion 53. The fixing portion 55 includes overhanging portions 55a, 55a protruding in the X-axis direction, which is the attachment / detachment direction, in the first base portion 52 and the second base portion 53, and insertion holes 55b, 55b formed in the respective overhanging portions 55a, 55a.

[0075] Here, the procedure for attaching the second unit 200 to the first unit 100 will be described. When an insertion member 56 is inserted through the insertion hole 55b of the first base portion 52 and the insertion hole 35b of one restraint member 30 with the overhanging portion 55a of the first base portion 52 and the overhanging portion 35a of one restraint member 30 overlapped, the first base portion 52 and one restraint member 30 are fixed. The second base portion 53 and the other restraint member 30 are fixed by inserting an insertion member 56 through the insertion hole 55b of the second base portion 53 and the insertion hole 35b of the other restraint member 30 with the overhanging portion 55a of the second base portion 53 and the overhanging portion 35a of the other restraint member 30 overlapped. Thereby, the second unit 200 is attached to the first unit 100.

[0076] When the first base portion 52 and the second base portion 53 are fixed to the pair of restraint members 30, 30 via the above-described fixing portion 55, the flow path portion 60 is liquid-tightly connected to the opening 20b of the electrode laminate 10. In the present embodiment, when the second unit 200 is attached to the first unit 100, the elastic portion 67 biases and presses the first connection portion 63 against the electrode laminate 10, so that each flow path 63a of the first connection portion 63 and each opening 20b are liquid-tightly connected, and each opening 20b of the electrode laminate 10 and each flow path 61a, 62a, 63a formed in the flow path portion 60 communicate with each other.

[0077] Note that the first unit 100 and the second unit 200 are configured to be relatively movable to a mounting position of the second unit 200 on the first unit 100 (a position where the insertion member 56 can be inserted through both the insertion hole 55b of the first base portion 52 and the insertion hole 35b of one of the restraint members 30, and the insertion member 56 can be inserted through both the insertion hole 55b of the second base portion 53 and the insertion hole 35b of the other restraint member 30).

[0078] Specifically, when the second unit 200 is attached to the first unit 100, the fixing portion 35 formed in one of the restraint members 30 and the fixing portion 35 formed in the other restraint member 30 are configured to be disposed between the fixing portion 55 formed in the first base portion 52 and the fixing portion 55 formed in the second base portion 53 in the Z-axis direction. The second unit 200 is provided so as to be slidable in the Y-axis direction to the mounting position on the first unit 100. In the present embodiment, the first unit 100 and the second unit 200 are also provided so as to be slidable in the X-axis direction.

[0079] Next, a procedure for removing the second unit 200 from the first unit 100 will be described. When the insertion member 56 is withdrawn from the insertion hole 55b of the first base portion 52 and the insertion hole 35b of one of the restraint members 30, and the insertion member 56 is withdrawn from the insertion hole 55b of the second base portion 53 and the insertion hole 35b of the other restraint member 30, the first base portion 52 and one of the restraint members 30 are separated, and the second base portion 53 and the other restraint member 30 are separated. As a result, the second unit 200 is separated from the first unit 100.

[0080] Returning to the description of the second unit 200, the connection member 70 is a portion to which the connected portion 110 is connected from vertically above as shown in FIG. 8. The connection member 70 is provided at an end opposite to the end of the main body pipe 61 where the nozzle 62 is attached in the extending direction of the main body pipe 61. A plurality of flow paths 71 through which a medium flows in communication with the respective flow paths 61a of the main body pipe 61 are formed in the connection member 70. The flow path 71 has a bent portion 71a that bends from the extending direction (X-axis direction) of the flow path 61a toward vertically above (positive side in the Z-axis direction) between one end communicating with the flow path 61a and the other end opposite to the one end.

[0081] Among the flow paths 71, the portion between the bent portion 71a and the other end extends along vertically above. A plurality of convex second connection portions 72 formed in the connection member 70 are provided at the other ends of the respective flow paths 71. The plurality of second connection portions 72 are arranged along the X-axis direction. Each of the connection portions between the second connection portion 72 and the connected portion 110 is located vertically above each opening 20b that communicates through the flow paths 61a, 62a, 63a, 71. Also, each of the second connection portions 72 is located vertically above each space S that communicates through the flow paths 61a, 62a, 63a, 71 and the opening 20b.

[0082] An example of the connected part 110 is the tip 113 of the supply pipe 120 to which the electrolytic solution 19 is supplied. For example, in the supply step S5, the supply pipe 120 is connected to the connection member 70. The connection between the connection member 70 and the supply pipe 120 is made by fitting the second connection part 72 with the recess 112 formed at the tip 113 of the supply pipe 120. A guiding part 114 for facilitating the connection between the tip 113 and the second connection part 72 is formed at the tip 113. The guiding part 114 guides the second connection part 72 to the recess 112 at the tip 113.

[0083] The configuration for facilitating the connection between the tip 113 and the second connection part 72 is not limited to the above-described configuration. For example, as shown in FIG. 10(B), a rod-shaped guided part 73 formed on the connection member 70 may be guided by a guiding part 114A formed on the tip 113A. Even with this configuration, the second connection part 72 can be indirectly guided to the recess 112 at the tip 113A by guiding the guided part 73 to the guiding part 114A.

[0084] As described above, by being attached to the electrode laminate 10, the first unit 100 of the present embodiment can restrain the electrode laminate 10 in a state where a predetermined load is applied in the Z-axis direction. Further, by being attached to the first unit 100, the second unit 200 of the present embodiment can connect the flow path part 60 to the opening 20b of the electrode laminate 10.

[0085] Hereinafter, the operation and effect of the manufacturing method of the first unit 100 and the power storage module will be described. An operator using the first unit 100 of the above embodiment only needs to perform a simple operation of inserting the sandwiched body HB including the compressed electrode laminate 10 between the pair of contact parts 41, 41 after compressing the electrode laminate 10 in the Z-axis direction via the pair of restraining members 30, 30, and the sandwiched body HB can be sandwiched by the pair of contact parts 41, 41 that regulate the force with which the electrode laminate 10 tends to expand in the Z-axis direction.

[0086] Also, in the first unit 100 of the present embodiment, in a state where the pair of regulating members 40, 40 sandwich the sandwiched body HB, by a simple operation of inserting the insertion member 36 into a plurality of through holes that penetrate both the pair of contact portions 41, 41 and the pair of restraint members 30, 30 in the Z-axis direction, the relative positions of the pair of regulating members 40, 40 with respect to the pair of restraint members 30, 30 can be fixed, and it is possible to prevent the restraint of the sandwiched body HB and thus the electrode laminate 10 by the pair of regulating members 40, 40 from being released. Thereby, when manufacturing the power storage module 1, the electrode laminate 10 of the electrodes laminated in the Z-axis direction can be easily restrained.

[0087] In the first unit 100 of the above embodiment, the insertion member 36 is formed of an insulating resin material. The resin material forming the insertion member 36 is softer than the metal material forming the main body portion 31 in which the insertion hole 31c is formed and the contact portion 41 in which the insertion hole 41c is formed. Thereby, when inserting and removing the insertion member 36 into and from the insertion holes 31c, 41c, foreign matter is likely to occur, such as a part of the insertion member 36 chipping or peeling off. However, even if such foreign matter occurs, it is possible to suppress the occurrence of problems such as a short circuit caused by the foreign matter.

[0088] Each of the restraint members 30, 30 of the first unit 100 of the above embodiment has power supply connection portions 34, 34 that are in contact with and electrically connected to the electrode laminate 10 and to which an external power supply is connected. Thereby, in a state where the electrode laminate 10 is restrained in the Z-axis direction (lamination direction), charging and discharging of the electrode laminate 10 can be easily performed via the power supply connection portions 34, 34 of the restraint members 30, 30.

[0089] In the first unit 100 of the above embodiment, while avoiding interference between the reinforcing rib 43 formed on the regulating member 40 and the restraint member 30, the strength of the regulating member 40 can be improved. Thereby, an increase in the size of the regulating member 40 can be suppressed.

[0090] In the first unit 100 of the above embodiment, since the protruding rib 32 is formed on the restraining member 30, the strength of the restraining member 30 can be improved. Further, in the first unit 100 of the above embodiment, since the protruding rib 32 is formed to be at the same height as the contact portion 41 or higher than the contact portion 41 in the Z direction, the first unit 100 is supported by the protruding rib 32 and thus the restraining member 30 located more centrally than the contact portions 41, 41 located at both ends in the Y-axis direction, and thus the first unit 100 that restrains the electrode laminate 10 can be stably placed.

[0091] In the first unit 100 of the above embodiment, since the elastic body 33 is provided between the restraining member 30 and the electrode laminate 10, the variation in the height of the electrode laminate 10 in the Z-axis direction can be absorbed by the elastic body 33, and thus the restraining pressure can be made uniform.

[0092] As described above, one embodiment has been described, but the present invention is not limited to the above embodiment. Various changes are possible without departing from the spirit of the invention.

[0093] (Modification 1) Instead of the configuration of the fixing portion 35 of the first unit 100 in the above embodiment, the configuration of the fixing portion 135 shown in FIG. 11 may be adopted. Also, instead of the configuration of the fixing portion 55 of the second unit 200 in the above embodiment, the configuration of the fixing portion 155 shown in FIG. 11 may be adopted. Specifically, the fixing portion 135 of the first unit 100 includes protruding portions 35a, 35a that protrude in the X-axis direction, which is the attachment / detachment direction, in the pair of restraint members 30, 30, insertion holes 35b, 35b formed in each of the protruding portions 35a, 35a, and recesses 35c, 35c formed in each of the protruding portions 35a, 35a. The fixing portion 155 of the second unit 200 includes protruding portions 55a, 55a that protrude in the X-axis direction, which is the attachment / detachment direction, in the pair of base portions 51, 51, insertion holes 55b, 55b formed in each of the protruding portions 55a, 55a, and convex portions 55c, 55c formed in each of the protruding portions 55a, 55a. The recesses 35c, 35c and the convex portions 55c, 55c extend along the Y-axis direction, respectively. The recesses 35c, 35c are formed from one end to the other end of the protruding portions 35a, 35a in the Y-axis direction. The convex portions 55c, 55c are formed from one end to the other end of the protruding portions 55a, 55a in the Y-axis direction.

[0094] In the configurations of the first unit 100 and the second unit 200 according to the first modification, the movement of the second unit 200 in the X-axis direction with respect to the first unit 100 can be restricted by a simple operation of fitting the convex portion 55c formed in the fixing portion 155 of the second unit 200 into the recess 35c formed in the fixing portion 135 of the first unit 100. Different from the second unit 200 in the above embodiment, the second unit 200 in the first modification is attached and detached by sliding along the Y-axis direction to the attachment position to the first unit 100. When attaching and detaching the second unit 200 of the first modification to and from the first unit 100, the first connection portion 63 (nozzle 62) is compressed in the X-axis direction so that the first connection portion 63 does not protrude in the X-axis direction from the first base portion 52 and the second base portion 53 when viewed from the Z-axis direction, and the second unit 200 is slid along the Y-axis direction. When the insertion member 56 is inserted into the insertion holes 35b, 55b, the movement of the second unit 200 in the Y-axis direction with respect to the first unit 100 is restricted.

[0095] (Modification 2) In the above-described embodiment and modification, an example was described in which the first unit 100 and the second unit 200 are fixed to each other via the fixing portion 35 formed on the first unit 100 and the fixing portion 55 formed on the second unit 200. However, for example, they may be fixed to each other via a connecting piece 80 as shown in FIG. 13(A). The connecting piece 80 has a pair of plate-shaped first portions 81, 81 facing each other, a plate-shaped second portion 82 connecting the first portions 81, 81, and a pair of protruding portions 83, 83 protruding from the first portions 81, 81 in the facing direction (Z-axis direction) of the first portions 81, 81. Hereinafter, the specific configurations of the first unit 100 and the second unit 200 connected using such a connecting piece 80 will be described.

[0096] In the first unit 100 shown in FIG. 12(A), the description of the restricting member 40 is omitted for convenience of explanation. In each of the pair of restraining members 30, 30 constituting the first unit 100, a recess 31d into which the protruding portion 83 of the connecting piece 80 can be fitted is formed. More specifically, the recess 31d is formed on the outer surface 31b of the main body portion 31 in each of the pair of restraining members 30, 30. Further, in each of the pair of base portions 51, 51 constituting the second unit 200, a recess 51d into which the protruding portion 83 of the connecting piece 80 can be fitted is formed. More specifically, the recess 51d is formed on the outer surface 51a in each of the pair of base portions 51, 51. As shown in FIG. 12(B), the size L1 in the Y-axis direction of the recesses 31d, 51d is formed to be substantially equal to the size L1 in the Y-axis direction of the protruding portion 83 shown in FIG. 13(A).

[0097] As shown in Fig. 13(B), the attachment of the second unit 200 to the first unit 100 is achieved by arranging the first unit 100 and the second unit 200 in which the recesses 31d and 51d are formed side by side in the X-axis direction, and then attaching the connecting piece 80 from the Y-axis direction such that the protruding portions 83 and 83 are inserted into the recesses 31d and 51d of the first unit 100 and the second unit 200. In the first unit 100 of Modification 2, the size of the regulating member 40 in the X-axis direction is formed shorter than that in the above-described embodiment. Therefore, the connecting piece 80 attached by the above-described method and the regulating member 40 are arranged side by side in the X-axis direction without interfering with each other. At this time, it is preferable that the second portion 82 of the connecting piece 80 and the connecting portion 42 of the regulating member 40 are flush (in a state without a step) in the Y-axis direction.

[0098] In the first unit 100 and the second unit 200 according to Modification 2, similar to the above-described embodiment and Modification 1, insertion holes 35b and 55b may be provided in the fixing portions 35 and 55, and the insertion member 56 may be inserted into the insertion holes 35b and 55b, or the insertion holes 35b and 55b may not be provided in the fixing portions 35 and 55. Further, instead of the recess 31d formed in the restraining member 30, a convex portion may be formed, and instead of the recess 51d formed in the base portion 51, a convex portion may be formed, and the second unit 200 may be fixed to the first unit 100 using a connecting piece 80 in which a recess capable of fitting into such a convex portion is formed.

[0099] (Modification 3) Similar to the above-described Modification 2, the second unit 200 may be attached to the first unit 100 using a connecting piece 80A as shown in Fig. 14(B). The connecting piece 80A is different from the connecting piece 80 according to Modification 2 in that it includes a plate-shaped main body plate 85 and a pair of protruding portions 86 and 86 protruding from the main body plate 85.

[0100] Further, as shown in FIG. 14(B), in addition to the configurations described in the above embodiments, recesses 31e extending in the Y-axis direction are formed on the outer surfaces 31b of the main body portions 31 of the pair of restraint members 30, 30, and recesses 51e extending in the Y-axis direction are formed on the outer surfaces 51a of the pair of base portions 51, 51. These recesses 31e, 51e are formed such that the protruding portions 86 of the connection piece 80A can be fitted therein. More specifically, the depth of the recess 31e with respect to the outer surface 31b and the depth of the recess 51e with respect to the outer surface 51b are formed to be substantially equal to the height of the protruding portion 86 in the Z-axis direction.

[0101] As shown in FIG. 14(C), for the attachment of the second unit 200 to the first unit 100, after arranging the first unit 100 and the second unit 200 having the recesses 31e, 51e formed therein side by side in the X-axis direction, the connection piece 80A is attached from the Z-axis direction such that the protruding portions 86, 86 are inserted into the recesses 31e, 51e of the first unit 100 and the second unit 200. In the third modification, when the connection piece 80A is attached to the first unit 100 and the second unit 200, the size of the regulating member 40 and the size of the connection piece 80A in the X-axis direction are appropriately adjusted so that the connection piece 80A and the regulating member 40 do not interfere with each other. Instead of forming the recess 31e in the restraint member 30, a protrusion may be formed, and instead of forming the recess 51e in the base portion 51, a protrusion may be formed, and the second unit 200 may be fixed to the first unit 100 using a connection piece 80A having a recess formed therein that can be fitted to such a protrusion.

[0102] (Modification 4) In the above-described embodiments and modified examples, the tip surface 63c of the first connection portion 63 of the second unit 200 has been described by taking an example in which it is formed flat as shown in FIG. 9, and a frame portion 20c (frame portion connecting body 20d) is formed on the side surface 20a of the electrode laminate 10. However, the present invention is not limited to this. As shown in FIGS. 15(A), 15(B), 15(C), and 16(A), for example, a protruding portion 63b that protrudes so as to surround the flow path 63a is formed on the tip surface 63c of the first connection portion 63, and the frame portion 20c (frame portion connecting body 20d) may not be formed on the side surface 20a of the electrode laminate 10. For example, the cross-sectional shape of the tip of the protruding portion 63b is formed in a semicircular shape. Thus, in a configuration in which the protruding portion 63b is formed on the first connection portion 63, the adhesion between the first connection portion 63 and the electrode laminate 10 can be enhanced even if the frame portion 20c (frame portion connecting body 20d) is not formed on the side surface 20a of the electrode laminate 10.

[0103] Further, the cross-sectional shape of the tip of the protruding portion 63b is not limited to the semicircular shape as shown in FIG. 16(A), and may be formed in an angular shape as shown in FIG. 16(B), a tapered shape as shown in FIGS. 16(C) and 16(D), or an M-shaped as shown in FIG. 16(E).

[0104] (Modified Example 5) In the second unit 200 of the above-described embodiments and modified examples, an example in which the first connection portion 63 is attached to the nozzle 62 by the gripping portion 62E has been described. However, the present invention is not limited to this. For example, as shown in FIGS. 17(A) to 17(C), by adopting a first connection portion 63 in which strip-shaped magnets 63M, 63M are embedded in the vicinity of both end portions in the Y-axis direction, it may be fixed to a nozzle 62 made of magnetic stainless steel. In this configuration, since it is not necessary to provide the gripping portion 62E on the outer peripheral surface of the nozzle 62, the size of the flow path portion 60 can be reduced. Thereby, even when the number of openings 20b of the electrode laminate 10 increases and the flow path portions 60 are increased according to the number, it is possible to suppress the interference between the flow path portions 60.

[0105] Also, as shown in FIG. 18, even when the gripping portion 62E of the first connection portion 63 is provided as in the above-described embodiment, the electrode laminate 10 may be projected from the tip of the nozzle 62 toward the side where the electrode laminate 10 is disposed, and both ends in the Z-axis direction of the first connection portion 63 may be gripped. In this case, the first unit 100 is attached to the electrode laminate 10 such that the side surfaces 30e on the second unit 200 side in the X-axis direction of the pair of restraint members 30, 30 are spaced farther rearward than the side surface 20a of the electrode laminate 10 where the opening 20b is formed. That is, in the first unit 100, a clearance portion of the gripping portion 62E is formed when the first connection portion 63 is pressed against the side surface 20a of the electrode laminate 10. In this configuration, since it is not necessary to form the first connection portion 63 into a shape attachable to the nozzle 62 by the gripping portion 62E and a simple shape can be achieved, the processing cost of the first connection portion 63 can be reduced.

[0106] (Modification 6) In addition to the configuration of the first base portion 52 of the second unit 200 according to the above-described embodiment and modification, a confirmation window 52W as shown in FIG. 19(A) may be formed. The confirmation window 52W is an opening portion provided for visually recognizing the connection state between the first connection portion 63 of the electrode laminate 10 to which the second unit 200 is attached to the first unit 100 and the frame portion connecting body 20d (opening 20b) from the Z-axis direction. Therefore, the confirmation window 52W is formed corresponding to the number of the frame portion connecting bodies 20d. An operator can visually recognize the connection portion between the first connection portion 63 and the frame portion connecting body 20d by looking at the confirmation window 52W from the Z-axis direction.

[0107] The position where the confirmation window 52W is formed is determined according to how the first unit 100 (a pair of restraint members 30, 30) clamps the electrode laminate 10. More specifically, the formation position of the confirmation window 52W is set based on the positional relationship between the side surface 20a of the electrode laminate 10 in the X-axis direction (the side surface 20a where the opening 20b is formed) and the side surface 30e of the restraint member 30 in the X-axis direction. The position of the confirmation window 52W shown in Fig. 19(B) corresponds to an example on the premise that the first unit 100 clamps the electrode laminate 10 such that the frame portion connector 20d of the electrode laminate 10 protrudes from the side surface 30e of the restraint member 30 in the X-axis direction.

[0108] Fig. 20(A) shows that a notch-shaped confirmation window 30W is formed in one of the restraint members 30, and a notch-shaped confirmation window 52W is formed in the first base portion 52. The confirmation window 30W and the confirmation window 52W combine with each other to form an open confirmation window. The positions of the confirmation window 30W and the confirmation window 52W shown in Fig. 20(A) correspond to an example on the premise that the first unit 100 clamps the electrode laminate 10 such that the frame portion connector 20d of the electrode laminate 10 protrudes slightly from the side surface 30e of the restraint member 30 in the X-axis direction, or on the premise that the first unit 100 clamps the electrode laminate 10 such that the frame portion connector 20d of the electrode laminate 10 and the side surface 30e of the restraint member 30 are flush in the X-axis direction.

[0109] Fig. 20(B) shows that a notch-shaped confirmation window 52W is formed in the first base portion 52. The position of the confirmation window 52W shown in Fig. 20(B) also corresponds to an example on the premise that the first unit 100 clamps the electrode laminate 10 such that the frame portion connector 20d of the electrode laminate 10 protrudes from the side surface 30e of the restraint member 30 in the X-axis direction. Fig. 20(C) shows that an opening serving as the confirmation window 30W is formed in the restraint member 30. The position of the confirmation window 30W shown in Fig. 20(C) corresponds to an example on the premise that the first unit 100 clamps the electrode laminate 10 such that the frame portion connector 20d of the electrode laminate 10 recesses from the side surface 30e of the restraint member 30 in the X-axis direction.

[0110] In addition, although an example has been described in which each of the confirmation windows 30W and 52W in FIGS. 19(A), 20(A), 20(B), and 20(C) is formed to have a size that allows all of the first connection portions 63 in the Y-axis direction to be visible when viewed from the Z-axis direction, for example, a confirmation window having a size that allows at least both end portions of the first connection portion 63 in the Y-axis direction to be visible may be provided. With such a configuration of the confirmation window, the constrained area of the constraining member 30 and / or the first base portion 52 with respect to the electrode laminate 10 can be increased.

[0111] (Other Modification Examples) In the above-described embodiment and some modification examples, the electrode laminate 10 is constrained by sandwiching the pair of constraining members 30, 30 with the regulating members 40, 40, but the present invention is not limited to this. For example, without using the regulating members 40, 40, a plurality of bolts may be inserted through the pair of constraining members 30, 30, and then nuts may be fastened to the respective bolts, and the electrode laminate 10 may be constrained by the fastening force.

[0112] In the above-described embodiment and modification examples, as shown in FIG. 1, the power storage module 1 having a configuration in which the bipolar electrodes 11 in which the positive electrode active material layer 16 is coated on the first surface 15a of the current collector 15 and the negative electrode active material layer 17 is coated on the second surface 15b of the current collector 15 are laminated via the separator 14 has been described as an example, but the present invention is not limited to this. For example, as shown in FIG. 21, the second surface 15Ab of the current collector 115A coated with the positive electrode active material layer 16 on the first surface 15Aa and the second surface 115Bb of the current collector 115B coated with the negative electrode active material layer 17 on the second surface 115Ba are brought into contact with each other, and a power storage module 1A having a configuration in which the current collectors 115A and 115B in contact with each other are used as one current collector and the pseudo-bipolar electrode 11A is laminated via the separator 14 may be used.

Explanation of Reference Numerals

[0113] 1,1A…Power storage module, 10…Electrode laminate (laminate), 11,11A…Bipolar electrode (electrode), 12…Negative terminal electrode (electrode), 13…Positive terminal electrode (electrode), 14…Separator, 15,115A,115B…Current collector, 19…Electrolyte, 20…Sealing part, 20a…Side surface, 20b…Opening, 20c…Frame part, 20d…Frame part connector, 25…Sealing sheet, 30…Restraining member, 31c…Insertion hole (through hole), 40…Regulating member, 41c…Insertion hole (through hole), 51…Base part, 60…Flow path part, 61…Main body pipe, 62…Nozzle, 63…First connection part, 70…Connection member, 72…Second connection part, 100…First unit (restraining jig), 110…Part to be connected, 120…Supply pipe, 200…Second unit, D…Lamination direction, HB…Object to be clamped, J…Jig, S…Space.

Claims

1. A restraining jig used during the manufacture of a power storage module including a plurality of electrodes, the restraining jig restraining a laminate in which the plurality of electrodes are laminated in a first direction in the lamination direction, a pair of restraining members disposed at both ends of the laminate in the first direction; a pair of restricting members provided at both ends of the sandwiched body including the laminate and the pair of restraining members in a second direction intersecting the first direction, and comprising: each of the pair of restricting members, a pair of contact portions that come into contact with edges of the pair of restraining members arranged in the first direction so as to sandwich the laminate from the outside in the first direction; a connecting portion connecting the pair of contact portions; and having the size of the restricting member in a third direction orthogonal to both the first direction and the second direction is equal to or greater than the size of the laminate in the third direction, in a state where the pair of restricting members sandwich the sandwiched body, a plurality of through holes penetrating both the pair of contact portions and the pair of restraining members in the first direction are formed in a plan view seen from the first direction, a restraining jig in which the relative position of the pair of restricting members with respect to the pair of restraining members is fixed by insertion members inserted into each of the plurality of through holes in a state where the pair of restricting members sandwich the sandwiched body.

2. A restraining jig used during the manufacture of a power storage module including a plurality of electrodes, the restraining jig restraining a laminate in which the plurality of electrodes are laminated in a first direction in the lamination direction, a pair of restraining members disposed at both ends of the laminate in the first direction; a pair of restricting members provided at both ends of the sandwiched body including the laminate and the pair of restraining members in a second direction intersecting the first direction, and comprising: each of the pair of restricting members, a pair of contact portions that come into contact with edges of the pair of restraining members arranged in the first direction so as to sandwich the laminate from the outside in the first direction; a connecting portion connecting the pair of contact portions; and having in a state where the pair of restricting members sandwich the sandwiched body, a plurality of through holes penetrating both the pair of contact portions and the pair of restraining members in the first direction are formed in a plan view seen from the first direction, A restraining jig, wherein in a state where the pair of restricting members sandwich the object to be sandwiched, the relative positions of the pair of restricting members with respect to the pair of restraining members are fixed by insertion members inserted into respective ones of the plurality of through holes.

3. The restraining jig according to claim 1 or 2, wherein the insertion member is formed of an insulating resin material.

4. The restraining jig according to any one of claims 1 to 3, wherein each of the pair of restraining members has a power supply connection portion that abuts against the laminate and is electrically connected thereto and to which an external power supply is connected.

5. The restricting member further has a reinforcing rib that connects an inner surface of the contact portion and an inner surface of the connection portion. The restraining jig according to any one of claims 1 to 4, wherein each of the pair of restraining members is formed with a notch portion in which the reinforcing rib is disposed when the object to be sandwiched is sandwiched by the pair of restricting members.

6. Each of the pair of restraining members has a protruding rib that protrudes on the side opposite to the laminate in the first direction. The restraining jig according to any one of claims 1 to 5, wherein the protruding rib when the object to be sandwiched is sandwiched by the pair of restricting members protrudes to be at the same height as the contact portion or higher than the contact portion in the first direction.

7. The restraining jig according to any one of claims 1 to 6, wherein at least one of the pair of restraining members further has an elastic body provided therebetween and the laminate.

8. A compression step of compressing an object to be sandwiched including a laminate in which a plurality of electrodes are laminated in a first direction and a pair of restraining members disposed at both ends of the laminate in the first direction. A pair of contact portions provided at both ends of the sandwiched body in a second direction intersecting the first direction and contacting the respective edges of the pair of restraint members from the outside in the first direction, and a connection portion connecting the pair of contact portions. Prepare a pair of restricting members whose size in a third direction orthogonal to both the first direction and the second direction is equal to or greater than the size of the laminate in the third direction. While sandwiching the sandwiched body compressed by the compression step with the pair of restricting members, in a state where the pair of restricting members sandwich the sandwiched body, both the pair of contact portions and the pair of restraint members penetrate in the first direction, and in a plan view seen from the first direction, a restraining step of fixing the relative position of the pair of restricting members with respect to the pair of restraining members by inserting an insertion member into each of a plurality of formed through holes. A method for manufacturing a power storage module, including:

9. A compression step of compressing a sandwiched body including a laminate in which a plurality of electrodes are laminated in a first direction and a pair of restraint members disposed at both ends of the laminate in the first direction. A pair of contact portions provided at both ends of the sandwiched body in a second direction intersecting the first direction and contacting the respective edges of the pair of restraint members from the outside in the first direction, and a connection portion connecting the pair of contact portions. While sandwiching the sandwiched body compressed by the compression step with a pair of restricting members, in a state where the pair of restricting members sandwich the sandwiched body, both the pair of contact portions and the pair of restraint members penetrate in the first direction, and in a plan view seen from the first direction, a restraining step of fixing the relative position of the pair of restricting members with respect to the pair of restraining members by inserting an insertion member into each of a plurality of formed through holes. A method for manufacturing a power storage module, including:

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