Method for manufacturing power storage device

Abstract

To suppress deformation of a current collector plate that occurs when welding the outer peripheral portion of a laminate film.SOLUTION: A first exterior body 22, a power storage body 1, and a second exterior body 21 are arranged in this order on an installation table P on which a second elastic body 200 is placed (Figs. 4(A), (B)). A first elastic body 400 is placed on a second current collector plate 18 of the second exterior body 21 (Fig. 4(C)). The first elastic body 400 is pressed in the stacking direction of the power storage body 1 using a restraint plate 500, and in a state where the second current collector plate 18 of the second exterior body 21 is held by the first elastic body 400, the outer peripheral portions of a second laminate film 31 (laminate film) and a first laminate film 32 (laminate film) are welded together by a welding jig 600 (Fig. 4(D)).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing an electricity storage device. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2004-134210 (Patent Document 1) discloses a stacked battery that includes a stacked electrode assembly and a laminate film (laminate sheet) that houses the stacked electrode assembly, with current collector plates exposed from the upper and lower surfaces of the laminate film. In such a stacked battery, the outer periphery of the laminate film is welded to seal the stacked electrode assembly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-134210 Summary of the Invention [Problem to be solved by the invention]

[0004] When the outer periphery of the laminate film is welded to seal the laminated electrode body, wrinkles may be generated in the current collector plate.

[0005] An object of the present disclosure is to suppress the generation of wrinkles in the current collector plates when sealing the stacked electrode body. [Means for solving the problem]

[0006] A manufacturing method for an energy storage device disclosed herein includes the steps of placing a first exterior body including a first laminate film on an installation stand and placing a laminated electrode body on the first exterior body; placing a second exterior body including a second current collector plate and a second laminate film having an opening formed in the center so that the second current collector plate is exposed, so as to cover the laminated electrode body; placing a first elastic body so as to contact the second current collector plate exposed from the opening; and welding the outer peripheries of the first laminate film and the second laminate film while pressing the first elastic body in a direction toward the laminated electrode body.

[0007] According to this method, the outer periphery of the first laminate film and the second laminate are welded together while the second current collector plate is pressed by the first elastic body, thereby preventing wrinkles from forming on the second current collector plate when sealing the laminated electrode body.

[0008] Preferably, the installation base is provided with a second elastic body, the first exterior body is disposed so as to be in contact with the second elastic body, and the second elastic body is harder than the first elastic body.

[0009] According to this method, the first exterior body is pressed while in contact with the second elastic body. Because the second elastic body is harder than the first elastic body, it can suitably support the stacked electrode body and the first exterior body, preventing the stacked electrode body and the first exterior body from deforming significantly and preventing the stacked electrode body and the first exterior body from being subjected to an undesirable load.

[0010] Preferably, the first outer casing includes a first current collecting plate, the first laminate film has an opening formed in the center so that the first current collecting plate is exposed, a second elastic body is provided on the installation base, the first outer casing is positioned so as to be in contact with the second elastic body, and the first elastic body is softer than the second elastic body.

[0011] According to this method, when the outer peripheries of the first laminate film and the second laminate are welded, the first current collector of the first exterior body is pressed toward the second elastic body by the laminate electrode, which prevents the first current collector from wrinkling. Also, because the first elastic body is softer than the second elastic body, an appropriate pressing force can be applied to the second current collector and the first current collector when pressed by the first elastic body.

[0012] Preferably, the step of welding the first laminate film and the second laminate film may be carried out in a state where the internal space of the exterior body composed of the first exterior body and the second exterior body is reduced in pressure.

[0013] By sealing the laminated electrode body with the internal space of the exterior body decompressed, a restraining force can be applied to the laminated electrode body due to the pressure difference with the outside. If the internal space of the exterior body is decompressed and sealing (welding the first laminate film and the second laminate film) is performed when there are wrinkles in the second current collector plate (and the first current collector plate), there is a high possibility that the second current collector plate (and the first current collector plate) will be sealed with the wrinkles remaining.

[0014] According to this method, the first elastic body (and the second elastic body) presses the second current collector plate (and the first current collector plate), welding the first laminate film and the second laminate film together to form a seal, thereby preventing wrinkles from forming (or remaining) on ​​the second current collector plate (and the second current collector plate).

[0015] Preferably, the first elastic body may be made up of a plurality of elastic bodies in contact with the second current collector plate.

[0016] According to this method, the first elastic body is composed of multiple elastic bodies in contact with the first current collector plate, making it possible to uniformly press the second current collector plate, and advantageously preventing wrinkles from occurring in the first current collector plate. [Effects of the Invention]

[0017] According to the present disclosure, it is possible to prevent wrinkles from being formed in the current collector plate when sealing the stacked electrode body. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of an electricity storage device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. [Figure 3] 3 is a schematic flowchart illustrating a method for manufacturing an electricity storage device according to the present embodiment. [Figure 4] 5A to 5D are diagrams illustrating a method for manufacturing the electricity storage device according to the present embodiment. [Figure 5] FIG. 10 is a top view of the second current collector plate when the first elastic body is disposed on the second current collector plate. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0020] Fig. 1 is a perspective view of an electricity storage device 100 according to this embodiment. Fig. 2 is a cross-sectional view taken along line II-II shown in Fig. 1.

[0021] As shown in FIGS. 1 and 2, the energy storage device 100 includes an energy storage unit 1 having a laminated electrode body 10 in which a plurality of electrodes (electrode plates 11) described below are laminated in a stacking direction, and a resin sealing body 40, and an exterior body 20 that houses the energy storage unit 1. The exterior body 20 is electrically connected to the terminal electrode of the laminated electrode body 10 and is provided so that current can be extracted to the outside in the stacking direction. The energy storage device 100 is, for example, a secondary battery such as a lithium-ion battery. The laminated electrode body 10 or the energy storage unit 1 corresponds to an example of a "laminated electrode body" in the present disclosure.

[0022] The laminated electrode assembly 10 includes a plurality of electrode plates 11, a plurality of separators 15, a positive terminal electrode 16, and a negative terminal electrode 17. The plurality of electrode plates 11, the positive terminal electrode 16, and the negative terminal electrode 17 are stacked in the stacking direction with the separators 15 interposed therebetween.

[0023] The separator 15 is formed in a sheet shape. Examples of the separator 15 include a porous film made of a polyolefin resin such as polyethylene (PE) or polypropylene (PP), and a woven or nonwoven fabric made of polypropylene, methyl cellulose, etc. The separator 15 may be reinforced with a vinylidene fluoride resin compound.

[0024] The plurality of electrode plates 11 are disposed between a positive terminal electrode 16 and a negative terminal electrode 17. The electrode plates 11 are, for example, bipolar electrodes. The electrode plates 11 include a current collector 12, a positive electrode layer 13, and a negative electrode layer 14.

[0025] Current collector 12 may contain at least one selected from the group consisting of aluminum (Al), stainless steel, nickel (Ni), chromium (Cr), platinum (Pt), niobium (Nb), iron (Fe), titanium (Ti), copper (Cu), and zinc (Zn). Current collector 12 may also be a metal foil whose surface is plated.

[0026] The current collector 12 has a first main surface 12a located on one side in the stacking direction and a second main surface 12b located on the other side in the stacking direction. A negative electrode layer 14 is provided on the first main surface 12a. A positive electrode layer 13 is provided on the second main surface 12b.

[0027] The positive terminal electrode 16 is located on one side in the stacking direction. The positive terminal electrode 16 includes a current collector 12 and a positive electrode layer 13. In the positive terminal electrode 16, the first main surface 12a of the current collector 12 is not provided with the negative electrode layer 14 or the positive electrode layer 13, and the positive electrode layer 13 is provided on the second main surface 12b of the current collector 12. A second current collector 18 is disposed on the first main surface 12a of the current collector 12 in the positive terminal electrode 16.

[0028] The negative terminal electrode 17 is located on the other side in the stacking direction. The negative terminal electrode 17 includes a current collector 12 and a negative electrode layer 14. In the negative terminal electrode 17, the negative electrode layer 14 is provided on the first main surface 12a of the current collector 12, and neither the negative electrode layer 14 nor the positive electrode layer 13 is provided on the second main surface 12b of the current collector 12. A first current collector 19 is disposed on the second main surface 12b of the current collector 12 in the negative terminal electrode 17.

[0029] The positive electrode layer 13 is formed by applying a positive electrode active material to the second main surface 12b. The positive electrode active material may be, for example, a material capable of absorbing and releasing charge carriers such as lithium ions. The positive electrode active material may be a lithium ion composite metal oxide having a layered rock salt structure, a metal oxide having a spinel structure, a polyanion compound, or any other material that can be used as a positive electrode active material for a lithium ion storage device. Two or more positive electrode active materials may also be used in combination. For example, the positive electrode active material may contain olivine-type lithium iron phosphate (LiFePO4).

[0030] The negative electrode layer 14 is formed by applying a negative electrode active material to the first main surface 12a. Examples of the negative electrode active material that may be used include lithium, carbon, metal compounds, and elements or compounds thereof that can be alloyed with lithium.

[0031] In each of the multiple electrode plates 11, the negative electrode terminal electrode 17, and the positive electrode terminal electrode 16, the peripheral edge of the current collector 12 is an uncoated area where the positive electrode layer 13 and the negative electrode layer 14 are not provided.

[0032] The resin sealing body 40 is provided to seal the periphery of the laminated electrode body 10. The resin sealing body 40 seals the internal space formed between two adjacent electrode plates 11. An electrolyte solution is poured into this internal space. The resin sealing body 40 is formed by hardening a resin material such as a hot melt material, a thermoplastic resin, a thermosetting resin, or a photocurable resin. The resin sealing body 40 is provided in an uncoated area.

[0033] The exterior body 20 includes a second exterior body 21 and a first exterior body 22. The second exterior body 21 and the first exterior body 22 are joined together at their respective peripheral edges to seal the power storage unit 1 inside. The second exterior body 21 is arranged on the side of a first surface (first main surface 12a of the current collector 12 in the positive terminal electrode 16) of the laminated electrode body 10 located at one end side in the stacking direction. The first exterior body 22 is arranged on the side of a second surface (second main surface 12b of the current collector 12 in the negative terminal electrode 17) of the laminated electrode body 10 located at the other end side in the stacking direction.

[0034] The second exterior body 21 includes a second current collector plate 18, a resin layer 50, and a second laminate film 31. The first exterior body 22 includes a first current collector plate 19, a resin layer 50, and a first laminate film 32.

[0035] The second current collector plate 18 and the first current collector plate 19 are disposed so as to sandwich the laminated electrode body 10 in the stacking direction. The second current collector plate 18 is disposed on the first main surface 12a of the current collector 12 of the positive terminal electrode 16. The second current collector 18 is disposed in contact with the first main surface 12a, thereby electrically connected to the positive terminal electrode 16. The second current collector 18 is electrically connected to the positive terminal electrode 16, thereby functioning as a positive terminal of the energy storage device 100. The first current collector 19 is disposed on the second main surface 12b of the current collector 12 of the negative terminal electrode 17. The first current collector 19 is disposed in contact with the second main surface 12b, thereby electrically connected to the negative terminal electrode 17. The first current collector 19 is electrically connected to the negative terminal electrode 17, thereby functioning as a negative terminal of the energy storage device 100. In the energy storage device 100, it is possible to extract current from the energy storage unit 1 housed inside to the outside via the second current collector 18, which functions as a positive terminal, and the first current collector 19, which functions as a negative terminal, without using tabs to extract the current to the outside.

[0036] The second current collector plate 18 and the first current collector plate 19 have a rectangular shape. The peripheral edges of the second current collector plate 18 and the first current collector plate 19 are located on the resin sealing body 40. The second current collector plate 18 and the first current collector plate 19 may be the same size.

[0037] The second current collector plate 18 and the first current collector plate 19 may contain at least one selected from the group consisting of aluminum (Al), stainless steel, nickel (Ni), chromium (Cr), platinum (Pt), niobium (Nb), iron (Fe), titanium (Ti), and zinc (Zn). The second current collector plate 18 and the first current collector plate 19 may also be made of metal foil with a plated surface.

[0038] The second laminate film 31 forms the peripheral portion of the second exterior body 21. The second laminate film 31 is joined to the peripheral edge of the second current collector plate 18. In the present embodiment, the second laminate film 31 is joined to the second current collector plate 18 with the resin layer 50 interposed between the second laminate film 31 and the peripheral edge of the second current collector plate 18.

[0039] The first laminate film 32 forms the peripheral portion of the first exterior body 22. The first laminate film 32 is joined to the peripheral edge of the first current collector plate 19. In the present embodiment, the first laminate film 32 is joined to the first current collector plate 19 with a resin layer 50 interposed between the first laminate film 32 and the peripheral edge of the first current collector plate 19.

[0040] Resin layer 50 may be made of an insulating resin material. Resin layer 50 may be made of a resin material that can be welded to second current collector plate 18 and first current collector plate 19. For example, heat-sealable resins such as polyethylene, polypropylene, modified polyethylene, and modified polypropylene can be used as resin layer 50. When resin layer 50 is welded to second current collector plate 18 and first current collector plate 19, shrinkage as resin layer 50 solidifies may cause wrinkles (wrinkles) in second current collector plate 18 and first current collector plate 19.

[0041] In this embodiment, the second laminate film 31 and the first laminate film 32 are laminate films. Each of the second laminate film 31 and the first laminate film 32 has a metal layer having a first main surface and a second main surface facing each other, a first insulating layer provided on the first main surface, and a second insulating layer provided on the second main surface.

[0042] The second laminate film 31 has a first metal layer 310, a first insulating layer 311, and a second insulating layer 312. The first metal layer 310 can be made of a metal foil such as Al foil, Ni foil, Cu foil, or stainless steel foil. The first metal layer 310 imparts moisture impermeability, air permeability, and chemical resistance to the second laminate film 31. The first metal layer 310 is sandwiched between the first insulating layer 311 and the second insulating layer 312.

[0043] First insulating layer 311 and second insulating layer 312 may be made of, for example, a heat-sealable resin such as polyethylene, polypropylene, modified polyethylene, or modified polypropylene. Second insulating layer 312 may be made of a different material from first insulating layer 311. Second insulating layer 312 may be made of, for example, a single layer of polyethylene terephthalate or nylon, or a laminate of these. First insulating layer 311 and second insulating layer 312 may be made of a single layer or may have a multi-layer structure.

[0044] The first laminate film 32 has a second metal layer 320, a first insulating layer 321, and a second insulating layer 322. The second metal layer 320 provides the first laminate film 32 with moisture resistance, air resistance, and chemical resistance. The second metal layer 320 is sandwiched between the first insulating layer 321 and the second insulating layer 322. The second metal layer 320, the first insulating layer 321, and the second insulating layer 322 can be made of the same materials as the first metal layer 310, the first insulating layer 311, and the second insulating layer 312.

[0045] The outer peripheries of the second laminate film 31 of the second exterior body 21 and the first laminate film 32 of the first exterior body 22 are joined by welding. As a result, the first insulating layer 311 of the second exterior body 21 and the first insulating layer 321 of the first exterior body 22 are welded together while facing each other, and the power storage unit 1 is thereby sealed in the second exterior body 21 and the first exterior body 22. A welded portion 70 is formed at the outer periphery where the second exterior body 21 and the first exterior body 22 are welded together.

[0046] An opening Op is formed in the center of the second laminate film 31 and the center of the first laminate film 32. The center of the second current collector 18 and the center of the first current collector 19 are exposed regions that are not covered by the resin layer 50, the second laminate film 31, or the first laminate film 32. In the exposed regions, the second current collector 18 and the first current collector 19 are exposed. Current can be directly extracted from the power storage unit 1 housed inside to the outside via this exposed region. In this embodiment, the power storage unit 1 (laminated electrode assembly 10) and the exterior body 20 (second exterior body 21, first exterior body 22) have a substantially rectangular shape when viewed from the stacking direction.

[0047] When the outer peripheries of the second laminate film 31 and the first laminate film 32 are welded together and the electricity storage unit 1 is sealed with the exterior housing 20, if there are wrinkles (wrinkles) in the second current collector 18 and the first current collector 19, the wrinkles may remain in the second current collector 18 and the first current collector 19 even after sealing, and wrinkles may occur on the surfaces of the second current collector 18 and the first current collector 19. In particular, if the sealing is performed while reducing the pressure in the internal space 800 of the electricity storage device 100 (the internal space 800 of the sealed exterior housing 20) to a negative pressure relative to the external pressure (atmospheric pressure), wrinkles are likely to remain in the second current collector 18 and the first current collector 19. Note that when the pressure in the internal space 800 is negative relative to the external pressure (atmospheric pressure), a restraining force can be applied to the laminated electrode body 10 (the electricity storage unit 1) due to the pressure difference between the pressure in the internal space 800 and the atmospheric pressure.

[0048] In this embodiment, when welding the outer peripheries of the second laminate film 31 and the first laminate film 32, the second current collector plate 18 and the first current collector plate 19 are pressed with an elastic body, thereby preventing wrinkles from occurring in the second current collector plate 18 and the first current collector plate 19.

[0049] Fig. 3 is a schematic flowchart illustrating a manufacturing method for the electricity storage device 100 of the present embodiment. Fig. 4 is a diagram illustrating a manufacturing method for the electricity storage device 100 of the present embodiment. Referring to Fig. 3, in step (hereinafter, step will be abbreviated as "S") 10, as shown in Fig. 4(A), the first exterior body 22 (first laminate film 32, first current collector plate 19) is placed on an installation stand P, and the electricity storage unit 1 is placed on the first exterior body 22. The second elastic body 200 is placed on the installation stand P, and the first exterior body 22 (first laminate film 32, first current collector plate 19) is placed in contact with the second elastic body 200.

[0050] In S20, as shown in Fig. 4(B), the second exterior body 21 (second laminate film 31, second current collector plate 18) is placed on the power storage unit 1. The second exterior body 21 is placed so as to cover the power storage unit 1, and the outer peripheries of the second laminate film 31 (first insulating layer 311) and the first laminate film 32 (first insulating layer 321) are placed facing each other.

[0051] In S30, a first elastic body 400 is placed on the second current collector plate 18 of the second exterior body 21. As shown in FIG. 4(C), the first elastic body 400 is placed so as to be in contact with the second current collector plate 18. FIG. 5 is a top view of the first elastic body 400 placed on the second current collector plate 18. In this embodiment, as shown in FIG. 5, the first elastic body 400 is made up of six first elastic bodies 400a to 400f. In this embodiment, the first elastic bodies 400 are placed over almost the entire exposed area of ​​the second current collector plate 18, excluding the stepped portion 18d (see FIG. 2) on the periphery thereof.

[0052] In S40, the first elastic body 400 is pressed in the stacking direction of the power storage unit 1 using the constraining plate 500. Then, with the second current collector plate 18 held down by the first elastic body 400, the outer peripheries of the second laminate film 31 and the first laminate film 32 are welded together by the welding jig 600. A force (pressing force) in a direction pressing the first elastic body 400 is applied to the constraining plate 500 by a plurality of jacks 500j. In this embodiment, a pressing force is applied to the constraining plate 500 by six jacks 500j arranged at positions corresponding to the six first elastic bodies 400a to f. Note that at least the step of S40 is performed, for example, in a decompression chamber, and after the pressure in the internal space 800 of the power storage device 100 is reduced, the outer peripheries of the second laminate film 31 and the first laminate film 32 are welded together.

[0053] The first elastic body 400 and the second elastic body 200 may be, for example, a urethane foam elastomer, with the first elastic body 400 being softer than the second elastic body 200, and the second elastic body 200 being harder than the first elastic body (the hardness of the first elastic body 400 is lower than the hardness of the second elastic body 200). The softness (hardness) of the first elastic body 400 is such that, when pressed by the restraint plate 500, wrinkles in the second current collecting plate 18 can be smoothed out evenly. The softness (hardness) of the second elastic body 200 is desirably such that it can suitably support the laminated electrode body 10 (electricity storage body 1) and the first outer casing 22 (first laminate film 32, first current collector plate 19), and that the laminated electrode body 10 (electricity storage body 1) and the first outer casing 22 (first laminate film 32, first current collector plate 19) are not significantly deformed by the pressure of the restraint plate 500, and that it is soft enough (hard enough) to evenly smooth out wrinkles in the first current collector plate 19.

[0054] According to the present embodiment, the second laminate film 31 and the first laminate film 32 are welded together at their outer peripheries with the first elastic body 400, which is arranged so as to be in contact with the second current collector 18 exposed from the opening Op of the second laminate film 31, pressing the second current collector 18 in the direction toward the electricity storage unit 1. Since the second laminate film 31 and the first laminate film 32 are welded together at their outer peripheries with the second current collector 18 pressed by the first elastic body 400, it is possible to prevent wrinkles from forming in the second current collector 18 after sealing.

[0055] In addition, the pressing force of the restraint plate 500 presses the first outer casing 22 (first current collector 19, first laminate film 32) against the second elastic body 200, and while the first current collector 19 is pressed against the second elastic body 200, the outer peripheries of the second laminate film 31 and the first laminate film 32 are welded together, thereby preventing wrinkles from forming in the first current collector 19 after sealing.

[0056] According to the present embodiment, first elastic body 400 is made softer than second elastic body 200. As a result, the pressing force of restraint plate 500 can be prevented from causing large deformation of second exterior body 21 (second current collector plate 18), power storage unit 1 (laminated electrode body 10), and first exterior body 22 (first current collector plate 19, first laminate film 32), while also preventing wrinkles from occurring in second current collector plate 18 and first current collector plate 19.

[0057] According to the present embodiment, the first elastic body 400 is made up of six first elastic bodies 400a-f, and since it is made up of a plurality of elastic bodies, it is possible to uniformly press the second current collector plate 18. The number of first elastic bodies 400 may be any number, and may be one or two or more.

[0058] In the above embodiment, the case where second exterior body 21 includes second current collector plate 18 and second laminate film 31, and first exterior body 22 includes first current collector plate 19 and first laminate film 32 has been described as an example, but the present invention is not limited to this. When the current collecting tab provided on negative terminal electrode 17 is provided so as to be able to protrude from exterior body 20, first exterior body 22 may be formed of first laminate film 32 only.

[0059] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0060] 1 storage battery, 10 laminated electrode body, 11 electrode plate, 12 current collector, 13 positive electrode layer, 14 negative electrode layer, 15 separator, 16 positive terminal electrode, 17 negative terminal electrode, 18 second current collector plate, 19 first current collector plate, 20 outer casing, 21 second outer casing, 22 first outer casing, 31 second laminate film, 32 first laminate film, 40 resin sealing body, 50 resin layer, 70 welded portion, 100 storage device, 200 second elastic body, 400 first elastic body, 500 restraining plate, 600 welding jig, 800 internal space, P installation stand.

Claims

1. a step of placing a first exterior body including a first laminate film on an installation stand and placing a laminated electrode body on the first exterior body; a step of disposing a second exterior body including a second current collector plate and a second laminate film having an opening formed in a central portion so that the second current collector plate is exposed, so as to cover the laminated electrode body; a step of placing a first elastic body so as to contact the second current collecting plate exposed through the opening; a step of welding the outer peripheries of the first laminate film and the second laminate film together while pressing the first elastic body in a direction toward the laminated electrode body; A method for manufacturing an electricity storage device, comprising:

2. The installation base is provided with a second elastic body, the first exterior body is disposed so as to be in contact with the second elastic body, The method for manufacturing an electricity storage device according to claim 1 , wherein the second elastic body is harder than the first elastic body.

3. the first exterior body includes a first current collector plate, the first laminate film has an opening formed in its center so that the first current collecting plate is exposed; The installation base is provided with a second elastic body, the first exterior body is disposed so as to be in contact with the second elastic body, The method for manufacturing an electricity storage device according to claim 1 , wherein the first elastic body is softer than the second elastic body.

4. The method for manufacturing an electricity storage device according to claim 1 , wherein the welding step is performed in a state where an internal space of an exterior body formed by the first exterior body and the second exterior body is depressurized.

5. The method for manufacturing an electricity storage device according to claim 1 , wherein the first elastic body is made up of a plurality of elastic bodies in contact with the second current collector plate.

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