Electricity storage device, lid, fixing jig, method for manufacturing electricity storage device, and transport jig

Abstract

To provide a power storage device, a lid, a fixing jig, a manufacturing method for the power storage device, and a transportation jig that can contribute to improving the accuracy of the position of the lid with respect to an electrode body.SOLUTION: A power storage device includes an electrode body and an outer casing that seals the electrode body. The outer casing includes an outer casing film that wraps around the electrode body to form an opening and a lid that is disposed in the opening. The lid has a first surface facing the electrode body, a second surface opposite the first surface, and a protrusion that protrudes from the second surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electricity storage device, a lid, a fixing jig, a method for manufacturing an electricity storage device, and a transport jig. [Background technology]

[0002] Patent Document 1 discloses an example of an electricity storage device. This electricity storage device includes an electrode assembly and an exterior body that seals the electrode assembly. The exterior body includes an exterior film that wraps the electrode assembly so as to form an opening, and a lid that is placed over the opening. The exterior film and the lid are joined together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-123686 Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacturing process of the above-mentioned electricity storage device, an intermediate body is manufactured in which lid bodies are placed on both ends of the electrode body. The intermediate body is then moved to a work area for the next manufacturing process. Therefore, there is a risk that the position of the lid body relative to the electrode body may be shifted as the intermediate body is moved.

[0005] The present invention aims to provide an electricity storage device in which the position of the lid body relative to the electrode body is highly accurate, a lid body used in this electricity storage device, a fixing jig and a transporting jig used when manufacturing or using this electricity storage device, and a method for manufacturing this electricity storage device. [Means for solving the problem]

[0006] An energy storage device according to a first aspect of the present invention comprises an electrode body and an exterior body that seals the electrode body, the exterior body comprising an exterior film that wraps the electrode body so as to form an opening, and a lid body that is placed in the opening, the lid body having a first surface facing the electrode body, a second surface opposite the first surface, and at least one of a protrusion that protrudes from the second surface and a recess that is recessed from the second surface toward the first surface.

[0007] An energy storage device according to a second aspect of the present invention is the energy storage device according to the first aspect, wherein the lid body includes a main body having the first surface and the second surface, and the protrusion includes a fixing member joined to the main body.

[0008] An energy storage device according to a third aspect of the present invention is the energy storage device according to the first aspect, wherein the lid body includes a main body having the first surface and the second surface, the main body having a thick portion protruding from the second surface, and holes formed in the thick portion and the main body.

[0009] An electricity accumulation device according to a fourth aspect of the present invention is the electricity accumulation device according to the first aspect, wherein the protrusion has a breakable portion.

[0010] An electricity storage device according to a fifth aspect of the present invention is a fixing jig used when manufacturing or using an electricity storage device according to any one of the first to fourth aspects, and includes a lid fixing portion that is fixed to at least one of the protrusion and the recess.

[0011] A lid body according to a sixth aspect of the present invention is a lid body used in an electricity storage device according to any one of the first to fourth aspects, and has a first surface, a second surface opposite to the first surface, and at least one of a protrusion protruding from the second surface and a recess recessed from the second surface toward the first surface.

[0012] A seventh aspect of the present invention relates to a method for manufacturing an electricity storage device, which includes an electrode body and an outer casing that seals the electrode body, wherein the outer casing includes an outer casing film that wraps the electrode body so as to form an opening, and a lid that closes the opening, and the lid has a first surface facing the electrode body, a second surface opposite the first surface, and at least one of a protrusion that protrudes from the second surface and a recess that is recessed from the second surface toward the first surface, and the method for manufacturing the electricity storage device includes a step of fixing the position of the lid body relative to the electrode body by fixing a jig to at least one of the protrusion and the recess of the lid body that is arranged on the side of the electrode body.

[0013] A transportation jig according to an eighth aspect of the present invention is a transportation jig for an electrode assembly, and comprises at least a pair of plates that sandwich the electrode assembly, and a connecting portion that connects the pair of plates.

[0014] A transportation jig according to a ninth aspect of the present invention is the transportation jig according to the eighth aspect, further comprising a handle attached to at least one of the pair of plates. [Effects of the Invention]

[0015] The electricity storage device, lid, fixing jig, electricity storage device manufacturing method, and transport jig according to the present invention can contribute to improving the positioning accuracy of the lid with respect to the electrode assembly. [Brief explanation of the drawings]

[0016] [Figure 1A] FIG. 1 is a plan view schematically showing an electricity storage device according to an embodiment. [Figure 1B] 1B is a diagram showing a method for measuring the seal strength of the second sealing portion of the electricity storage device in FIG. 1A. FIG. [Figure 2] 1B is a cross-sectional view showing an example of a layer structure of an exterior film included in the electricity storage device of FIG. 1A. [Figure 3] FIG. 1B is a perspective view of a lid provided in the electricity storage device of FIG. 1A. [Figure 4] FIG. 1B is a diagram showing the state in which the exterior film provided on the electricity storage device of FIG. 1A is unfolded. [Figure 5] FIG. 4 is a cross-sectional view of the lid of FIG. 3. [Figure 6] 1B is a perspective view of an intermediate body placed on a fixing jig used in the manufacturing process of the electricity storage device of FIG. 1A. FIG. [Figure 7] 1B is a flowchart showing an example of a manufacturing process for the electricity storage device of FIG. 1A. [Figure 8] FIG. 8 is a diagram relating to the second step of FIG. 7. [Figure 9] FIG. 8 is a diagram relating to the third step in FIG. 7. [Figure 10] FIG. 8 is another view relating to the third step of FIG. 7. [Figure 11] 8 is yet another diagram relating to the third step of FIG. 7. [Figure 12] 8 is a diagram showing an example of the relationship between strain and stress acting on the exterior film in the third step of FIG. 7. [Figure 13] FIG. 8 is a diagram relating to the fourth step in FIG. 7. [Figure 14] FIG. 8 is a diagram relating to the fifth step in FIG. 7. [Figure 15] 8 is a flowchart showing an example of the fifth step in FIG. 7. [Figure 16] FIG. 8 is another view relating to the fifth step of FIG. 7. [Figure 17] FIG. 8 is a diagram relating to the sixth step of FIG. 7. [Figure 18] 8 is a diagram relating to the eighth and ninth steps of FIG. 7. [Figure 19] FIG. 1B is a side view of the electricity storage device of FIG. 1A with a transport jig attached thereto. [Figure 20] Plan view of Figure 19. [Figure 21] FIG. 10 is a perspective view of a lid provided in an electricity storage device according to a modified example. [Figure 22] FIG. 10 is a perspective view of a lid provided in an electricity storage device according to another modified example. [Figure 23] FIG. 10 is a side view of an electricity storage device according to still another modified example. [Figure 24] FIG. 23 is a perspective view of a fixing jig for fixing the lid body of FIG. 22. [Figure 25] FIG. 10 is a plan view of an electricity storage device according to a modified example. [Figure 26]FIG. 8 is a diagram showing a modified example of the third step in FIG. 7. [Figure 27] FIG. 8 is a diagram showing a modified example of the fifth step in FIG. 7. [Figure 28] FIG. 8 is a diagram relating to another modified example of the fifth step of FIG. 7, showing the state in which the seal bar is in the initial position. [Figure 29] 29 is a diagram showing the state in which the seal bar in FIG. 28 is in the reference position. [Figure 30] FIG. 8 is a diagram showing a process of yet another modified example of the fifth process of FIG. 7. [Figure 31] 1B is a flowchart showing a modified example of the manufacturing process for the electricity storage device of FIG. 1A. [Figure 32] A diagram relating to the 32nd step of Figure 31. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an electricity storage device according to one embodiment of the present invention will be described with reference to the drawings. In this specification, a numerical range indicated by "to" means "greater than or equal to" or "less than or equal to." For example, the expression "2 to 15 mm" means 2 mm or more and 15 mm or less.

[0018] [1. Embodiment] <1-1. Configuration of the power storage device> FIG. 1A is a plan view schematically showing an electricity storage device 10 of a first embodiment. FIG. 1B is a diagram relating to a method for measuring the seal strength of a second sealed portion 80 of the electricity storage device 10. FIG. 2 is a cross-sectional view showing the layer structure of an exterior film 50 included in the electricity storage device 10 of FIG. 1A. FIG. 3 is a perspective view of a lid 60 included in the electricity storage device 10 of FIG. 1A. FIG. 4 is a view showing the exterior film 50 included in the electricity storage device 10 of FIG. 1A in an unfolded state. FIG. 5 is a cross-sectional view of the lid 60 of FIG. 3. FIG. 6 is a perspective view showing a state in which an intermediate body is placed on a fixing jig 100 used in the manufacturing process of the electricity storage device 10. In FIG. 1A, the direction of arrow UD indicates the thickness direction of the electricity storage device 10, the direction of arrow LR indicates the width direction of the electricity storage device 10, and the direction of arrow FB indicates the depth direction of the electricity storage device 10. The directions indicated by the arrows UD, LR, and FB are common to the subsequent figures.

[0019] The electricity storage device 10 includes an electrode body 20, an electrode terminal 30, and an exterior body 40. The electrode body 20 includes electrodes (positive and negative electrodes) constituting an electricity storage member such as a lithium-ion battery, a capacitor, an all-solid-state battery, a semi-solid battery, a quasi-solid battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, a polycation battery, or a capacitor, as well as a separator. In this embodiment, the electrode body 20 has a substantially rectangular parallelepiped shape. Note that the term "substantially rectangular parallelepiped" includes not only a perfect rectangular parallelepiped, but also a solid that can be considered a rectangular parallelepiped by modifying the shape of a portion of its outer surface, for example. The electrode body 20 may have a cylindrical or polygonal prism shape, for example.

[0020] In this embodiment, the electricity storage device 10 includes two electrode terminals 30. The electrode terminals 30 are metal terminals used for inputting and outputting electric power to and from the electrode body 20. One end of the electrode terminal 30 is electrically connected to an electrode (positive electrode or negative electrode) included in the electrode body 20. The other end of the electrode terminal 30 protrudes outward from, for example, an edge of the exterior body 40. Note that the electrode terminal 30 may be any terminal as long as it is capable of inputting and outputting electric power to and from the electrode body 20, and may not, for example, protrude from the exterior body 40. When the lid body 60 described below is made of, for example, metal, the lid body 60 may also function as the electrode terminal 30. In this case, the lid body 60, which functions as an electrode terminal, may or may not protrude from the exterior body 40.

[0021] The metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, copper, etc. For example, when the electrode body 20 is a lithium ion battery, the electrode terminal 30 connected to the positive electrode is usually made of aluminum, etc., and the electrode terminal 30 connected to the negative electrode is usually made of copper, nickel, etc. Note that the outermost layer of the electrode body 20 does not necessarily have to be an electrode, and may be, for example, a protective tape or a separator.

[0022] The exterior body 40 seals the electrode body 20. The exterior body 40 includes an exterior film 50 and a lid 60. The exterior film 50 wraps the electrode body 20 so as to have an opening 40A. In this embodiment, the exterior film 50 is wrapped around the electrode body 20 so as to have the opening 40A. The lid 60 is placed in the opening 40A. Note that the electrode body 20 may be housed inside the exterior film 50 that is configured in a cylindrical shape so as to form the opening 40A, and the opening 40A may be closed by the lid 60.

[0023] An adhesive film (not shown) is preferably bonded to the electrode terminal 30 from the viewpoint of favorable adhesion to the lid 60. Any adhesive film can be selected as long as it can bond the electrode terminal 30, which is made of metal, to the lid 60, which is made of resin. Examples of adhesive films that can be used include polyolefin resins such as polyethylene resins and polypropylene resins, cyclic polyolefin resins, and acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. The adhesive film can be a single layer or two or more layers of these. In this embodiment, the adhesive film is bonded to substantially the entire portion of the electrode terminal 30 that is covered by the lid 60.

[0024] For example, there is a method of forming a storage portion (recess) in the exterior film 50 through cold forming to store the electrode assembly 20. However, it is not necessarily easy to form a deep storage portion using this method. Attempting to form a deep storage portion (recess) through cold forming (for example, a forming depth of 15 mm) increases the likelihood of pinholes or cracks occurring in the exterior film 50, resulting in a decrease in battery performance. On the other hand, the exterior body 40 seals the electrode assembly 20 by wrapping the exterior film 50 around the electrode assembly 20, and therefore can easily seal the electrode assembly 20 regardless of the thickness of the electrode assembly 20. Note that in order to reduce the dead space between the electrode assembly 20 and the exterior film 50 and improve the volumetric energy density of the power storage device 10, it is preferable that the exterior film 50 be wrapped so as to contact the outer surface of the electrode assembly 20. Furthermore, in all-solid-state batteries, it is necessary to apply a high pressure uniformly from the outer surface of the battery to maximize battery performance, so it is necessary to eliminate the space between the electrode assembly 20 and the exterior film 50. Therefore, it is preferable that the exterior film 50 be wrapped so as to contact the outer surface of the electrode assembly 20.

[0025] As shown in FIG. 2 , the exterior film 50 is a laminate (laminate film) having, for example, a base material layer 51, a barrier layer 52, and a heat-sealable resin layer 53 in this order. Note that the exterior film 50 does not need to include all of these layers; for example, it may not include the barrier layer 52. That is, the exterior film 50 may be made of any flexible and easily bendable material, such as a resin film. Note that the exterior film 50 is preferably heat-sealable. The innermost and outermost layers of the exterior film 50 may be heat-sealable resin layers 53. In this case, the exterior film 50 may encase the electrode assembly 20 and the lid 60 by joining the outermost and innermost layers.

[0026] The substrate layer 51 included in the exterior film 50 is a layer that imparts heat resistance to the exterior film 50 and prevents pinholes from forming during processing or distribution. The substrate layer 51 is composed of, for example, at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer. For example, by including at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer in the substrate layer 51, the barrier layer 52 can be protected during processing of the exterior film 50, and breakage of the exterior film 50 can be prevented. Furthermore, from the viewpoint of increasing the tensile elongation of the exterior film 50, the stretched polyester resin layer is preferably a biaxially stretched polyester resin layer, and the stretched polyamide resin layer is preferably a biaxially stretched polyamide resin layer. Furthermore, from the viewpoint of excellent puncture strength or impact strength, the stretched polyester resin layer is more preferably a biaxially stretched polyethylene terephthalate (PET) film, and the stretched polyamide resin layer is more preferably a biaxially stretched nylon (ONy) film. The substrate layer 51 may be composed of both a stretched polyester resin layer and a stretched polyamide resin layer. The thickness of the base layer 51 is preferably, for example, 5 to 300 μm, and more preferably 5 to 150 μm, from the viewpoint of film strength.

[0027] The barrier layer 52 is a layer that prevents at least moisture from penetrating. The barrier layer 52 is bonded to the base layer 51 via, for example, an adhesive layer 54. Examples of the barrier layer 52 include metal foils, vapor-deposited films, and resin layers with barrier properties. Vapor-deposited films include metal vapor-deposited films, inorganic oxide vapor-deposited films, and carbon-containing inorganic oxide vapor-deposited films. Resin layers include fluorine-containing resins such as polyvinylidene chloride, polymers based on chlorotrifluoroethylene (CTFE), polymers based on tetrafluoroethylene (TFE), polymers having fluoroalkyl groups, and polymers based on fluoroalkyl units, as well as ethylene-vinyl alcohol copolymers. Other examples of the barrier layer 52 include resin films having at least one of these vapor-deposited films and resin layers. The barrier layer 52 may be formed of multiple layers. The barrier layer 52 preferably includes a layer made of a metal material. Specific examples of the metal material constituting the barrier layer 52 include aluminum alloys, stainless steel, titanium steel, and steel plates. When used as a metal foil, it is preferable that the metal material contains at least one of an aluminum alloy foil and a stainless steel foil.

[0028] In the barrier layer 52, the layer made of the aforementioned metallic material may contain recycled metallic material. Examples of recycled metallic material include recycled aluminum alloy, stainless steel, titanium steel, and steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloy material can be obtained, for example, by the manufacturing method described in International Publication No. 2022 / 092231. The barrier layer 52 may be made solely of recycled material, or may be made of a mixture of recycled and virgin material. Note that recycled metallic material refers to metallic material that has been made reusable by collecting, isolating, and refining various products used in the market or waste from manufacturing processes. Furthermore, virgin metallic material refers to new metallic material refined from natural metallic resources (raw materials) and is not recycled material.

[0029] From the viewpoint of improving the formability or conformability of the exterior film 50, the aluminum alloy foil is preferably a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of further improving the formability or conformability, an aluminum alloy foil containing iron is preferable. In the iron-containing aluminum alloy foil (100% by mass), the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass. By setting the iron content to 0.1% by mass or more, an exterior film 50 with better formability can be obtained. By setting the iron content to 9.0% by mass or less, an exterior film 50 with better flexibility can be obtained. Examples of soft aluminum alloy foils include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, and the like may also be added as needed. Softening can be achieved by annealing or other methods. From the perspective of improving the mechanical strength of the exterior film 50, the aluminum alloy foil is preferably a hard aluminum alloy foil made of, for example, a work-hardened aluminum alloy. Examples of hard aluminum alloy foils include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-H18, JIS H4160:1994 A8079H-H18, JIS H4000:2014 A8021P-H14, or JIS H4000:2014 A8079P-H14.

[0030] Examples of stainless steel foil include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. Furthermore, from the viewpoint of providing an exterior film 50 with excellent formability, the stainless steel foil is preferably made of austenitic stainless steel.

[0031] Specific examples of austenitic stainless steels that can be used to form the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.

[0032] In the case of a metal foil, the thickness of the barrier layer 52 should be sufficient to at least function as a barrier layer that prevents moisture penetration, and may be, for example, approximately 9 to 200 μm. The thickness of the barrier layer 52 is preferably approximately 85 μm or less, more preferably approximately 50 μm or less, even more preferably approximately 40 μm or less, and particularly preferably approximately 35 μm or less. The thickness of the barrier layer 52 is preferably approximately 10 μm or more, even more preferably approximately 20 μm or more, and more preferably approximately 25 μm or more. Preferred thickness ranges for the barrier layer 52 include approximately 10 to 85 μm, approximately 10 to 50 μm, approximately 10 to 40 μm, approximately 10 to 35 μm, approximately 20 to 85 μm, approximately 20 to 50 μm, approximately 20 to 40 μm, approximately 20 to 35 μm, approximately 25 to 85 μm, approximately 25 to 50 μm, approximately 25 to 40 μm, and approximately 25 to 35 μm. When the barrier layer 52 is made of an aluminum alloy foil, the above-mentioned range is particularly preferable. From the viewpoint of imparting high formability and high rigidity to the exterior film 50, the thickness of the barrier layer 52 is preferably about 35 μm or more, more preferably about 45 μm or more, even more preferably about 50 μm or more, and even more preferably about 55 μm or more, and is preferably about 200 μm or less, more preferably about 85 μm or less, even more preferably about 75 μm or less, and even more preferably about 70 μm or less. Preferred ranges are approximately 35 to 200 μm, approximately 35 to 85 μm, approximately 35 to 75 μm, approximately 35 to 70 μm, approximately 45 to 200 μm, approximately 45 to 85 μm, approximately 45 to 75 μm, approximately 45 to 70 μm, approximately 50 to 200 μm, approximately 50 to 85 μm, approximately 50 to 75 μm, approximately 50 to 70 μm, approximately 55 to 200 μm, approximately 55 to 85 μm, approximately 55 to 75 μm, and approximately 55 to 70 μm. The high formability of the exterior film 50 facilitates deep drawing, which can contribute to increasing the capacity of the electricity storage device. Furthermore, the increased rigidity of the exterior film 50 allows the exterior film 50 to be suitably wrapped around the electrode body 20 when the exterior film 50 is to be wrapped around the electrode body 20. Furthermore, when the capacity of the electricity storage device is increased, the weight of the electricity storage device increases, but increasing the rigidity of the exterior film 50 can contribute to high sealing performance of the electricity storage device.In particular, when the barrier layer 52 is made of stainless steel foil, the thickness of the stainless steel foil is preferably about 60 μm or less, more preferably about 50 μm or less, even more preferably about 40 μm or less, even more preferably about 30 μm or less, and particularly preferably about 25 μm or less. The thickness of the stainless steel foil is preferably about 10 μm or more, more preferably about 15 μm or more. Preferred ranges for the thickness of the stainless steel foil include about 10 to 60 μm, about 10 to 50 μm, about 10 to 40 μm, about 10 to 30 μm, about 10 to 25 μm, about 15 to 60 μm, about 15 to 50 μm, about 15 to 40 μm, about 15 to 30 μm, and about 15 to 25 μm.

[0033] Furthermore, when the barrier layer 52 is an aluminum foil, it is preferable that a corrosion-resistant coating be provided on at least the surface opposite the substrate layer 51 to prevent dissolution and corrosion. The barrier layer 52 may be provided with a corrosion-resistant coating on both sides. Here, the corrosion-resistant coating refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) by performing, for example, a hydrothermal conversion treatment such as boehmite treatment, a chemical conversion treatment, an anodizing treatment, a plating treatment using nickel or chromium, or a corrosion prevention treatment such as applying a coating agent on the surface of the barrier layer 52. Specifically, the corrosion-resistant coating refers to a coating that improves the acid resistance of the barrier layer 52 (acid-resistant coating), a coating that improves the alkali resistance of the barrier layer 52 (alkali-resistant coating), or the like. The corrosion-resistant coating may be formed by one type of treatment or a combination of two or more types. Furthermore, the barrier layer 52 may be formed not only as a single layer but also as a multi-layer. Furthermore, among these treatments, hydrothermal conversion treatment and anodizing treatment are treatments in which the surface of the metal foil is dissolved using a treatment agent to form a metal compound with excellent corrosion resistance. Note that these treatments may also be included in the definition of chemical conversion treatment. Furthermore, if the barrier layer 52 has a corrosion-resistant coating, the corrosion-resistant coating is also included in the barrier layer 52.

[0034] The corrosion-resistant coating prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the base layer 51 when the exterior film 50 is formed or wound, prevents dissolution and corrosion of the surface of the barrier layer 52 due to hydrogen fluoride produced by a reaction between an electrolyte and water, and particularly prevents dissolution and corrosion of aluminum oxide present on the surface of the barrier layer 52 when the barrier layer 52 is an aluminum alloy foil, and also improves the adhesion (wettability) of the surface of the barrier layer 52, thereby preventing delamination between the base layer 51 and the barrier layer 52 during heat sealing and between the base layer 51 and the barrier layer 52 during forming.

[0035] The heat-sealable resin layer 53 is bonded to the barrier layer 52 via, for example, an adhesive layer 55. The heat-sealable resin layer 53 included in the exterior film 50 is a layer that provides heat-sealing properties to the exterior film 50. Examples of the heat-sealable resin layer 53 include resin films made of polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins and polypropylene resins, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the viewpoints of sealability and strength, the thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 μm, and more preferably 40 to 150 μm.

[0036] The exterior film 50 preferably has one or more layers with a buffer function (hereinafter referred to as "buffer layer") outside the heat-sealable resin layer 53, more preferably outside the barrier layer 52. The buffer layer may be laminated on the outside of the base material layer 51, or the base material layer 51 may also function as a buffer layer. When the exterior film 50 has multiple buffer layers, the multiple buffer layers may be adjacent to each other, or may be laminated with the base material layer 51, the barrier layer 52, or the like interposed therebetween.

[0037] The material constituting the buffer layer can be arbitrarily selected from materials having cushioning properties. Examples of the material having cushioning properties include rubber, nonwoven fabric, and foam sheet. Examples of rubber include natural rubber, fluororubber, and silicone rubber. The rubber hardness is preferably about 20 to 90. The material constituting the nonwoven fabric is preferably a material having excellent heat resistance. When the buffer layer is made of nonwoven fabric, the lower limit of the thickness of the buffer layer is preferably 100 μm, more preferably 200 μm, and even more preferably 1000 μm. When the buffer layer is made of nonwoven fabric, the upper limit of the thickness of the buffer layer is preferably 5000 μm, and even more preferably 3000 μm. The thickness of the buffer layer is preferably in the range of 100 μm to 5000 μm, 100 μm to 3000 μm, 200 μm to 5000 μm, 200 μm to 3000 μm, 1000 μm to 5000 μm, or 1000 μm to 3000 μm, and most preferably in the range of 1000 μm to 3000 μm.

[0038] When the buffer layer is made of rubber, the lower limit of the buffer layer thickness is preferably 0.5 mm. When the buffer layer is made of rubber, the upper limit of the buffer layer thickness is preferably 10 mm, more preferably 5 mm, and even more preferably 2 mm. When the buffer layer is made of rubber, the preferred range of the buffer layer thickness is 0.5 mm to 10 mm, 0.5 mm to 5 mm, or 0.5 mm to 2 mm.

[0039] When the exterior film 50 has a buffer layer, the buffer layer functions as a cushion, thereby preventing the exterior film 50 from being damaged by impact when the energy storage device 10 is dropped or by handling during the manufacture of the energy storage device 10.

[0040] The lid 60 shown in Fig. 3 has, for example, a rectangular parallelepiped shape and is, for example, a resin molded product made of a resin material. The lid 60 may also be a metal molded product. The material constituting the lid 60 may include at least two or more types of materials selected from a metal oxide, a carbon material, and a rubber material. The lid 60 may also include a metal oxide, a carbon material, and a rubber material.

[0041] The lid 60 is preferably made up of a resin material. Here, "made up of a resin material" means that, when the entire material constituting the lid 60 is taken as 100% by mass, the content of the resin material is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more. In other words, the material constituting the lid 60 can contain materials other than the resin material in addition to the resin material.

[0042] Specific examples of resins include thermoplastic resins such as polyester, polyolefin, polyamide, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenolic resin, as well as modified versions of these resins. The resin material may be a mixture of these resins, a copolymer, or a modified copolymer. Among these, the resin material is preferably a heat-sealable resin such as polyester or polyolefin, and more preferably polyolefin. When the resin material is a resin, the lid 60 may be molded using any molding method.

[0043] Specific examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters. Examples of copolymer polyesters include copolymer polyesters whose repeating units are primarily ethylene terephthalate. Specific examples include copolymer polyesters in which ethylene terephthalate is the main repeating unit and is polymerized with ethylene isophthalate (hereinafter abbreviated as polyethylene (terephthalate / isophthalate)), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl dicarboxylate), and polyethylene (terephthalate / decane dicarboxylate). Among these, polybutylene terephthalate is preferred as the resin material from the viewpoint of improving heat resistance and pressure resistance.

[0044] Specific examples of polyolefins include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene-α-olefin copolymers; polypropylenes such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); propylene-α-olefin copolymers; and ethylene-butene-propylene terpolymers. When the polyolefin resin is a copolymer, it may be a block copolymer or a random copolymer. Among these, polypropylene is preferred as the resin material because of its excellent heat-sealing properties and electrolyte resistance.

[0045] The resin as the resin material may contain a filler as needed. Specific examples of the filler include glass beads, graphite, glass fiber, and carbon fiber. By including the filler in the resin as the resin material, the deformation resistance of the lid 60 against temperature changes can be improved.

[0046] The melt mass flow rate of the resin material contained in the material constituting the lid body 60 is preferably in the range of 1 g / 10 min to 80 g / 10 min, and more preferably in the range of 5 g / 10 min to 60 g / 10 min. The melt mass flow rate is measured based on JIS K7210-1:2014.

[0047] The lid 60 may be configured to contain a conductive material. "Containing a conductive material" means that, when the entire material constituting the lid 60 is taken as 100% by mass, the content of the conductive material is 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more. In other words, the material constituting the lid 60 can contain, in addition to the conductive material, a material other than the conductive material.

[0048] The conductive material forming the lid body 60 is, for example, a metal material. The metal material forming the lid body 60 is, for example, aluminum, aluminum alloy, nickel, copper, or a copper alloy. For example, when the electrode body 20 is a lithium-ion battery, the lid body 60 connected to the positive electrode is preferably formed of aluminum or an aluminum alloy. The lid body 60 connected to the negative electrode is preferably formed of nickel, copper, or a copper alloy. The material forming the lid body 60 connected to the negative electrode may be nickel-plated copper. The material forming the lid body 60 may contain recycled metal materials. When the lid body 60 is formed of a conductive material, the lid body 60 also functions as the electrode terminal 30. Since the electrode terminal 30 can be omitted from the electricity storage device 10, the configuration of the electricity storage device 10 can be simplified.

[0049] When the lid 60 contains a conductive material, the lid 60 may be bonded to the exterior film 50 via an adhesive film. Any adhesive film can be selected as long as it can bond the exterior film 50 and the lid 60 together. The adhesive film is preferably a laminated film having at least a heat-sealable resin layer, a heat-resistant substrate layer, and a heat-sealable resin layer in this order. The specifications for the heat-sealable resin layer of the adhesive film are the same as those for the heat-sealable resin layer 53. The materials constituting the heat-sealable resin layers on both sides of the adhesive film may be the same or different, and are selected appropriately depending on the materials constituting the heat-sealable resin layer 53 of the exterior film 50 and the materials constituting the lid 60. The material constituting the heat-sealable resin layer of the adhesive film on the side to be bonded to the lid 60 is preferably an acid-modified polyolefin resin graft-modified with an acid such as maleic anhydride. The heat-sealable resin layer of the adhesive film on the side that is bonded to the exterior film 50 is preferably made of the same type of material as the material that constitutes the heat-sealable resin layer 53 of the exterior film 50 .

[0050] The heat-resistant substrate layer may be any film made of a heat-resistant resin, such as a non-stretched or stretched film of polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polymethylpentene (registered trademark), polyacetal cyclic polyolefin, polyethylene, polypropylene, etc. Polyethylene terephthalate is particularly preferred because it is inexpensive and has high strength.

[0051] The adhesive film preferably has adhesiveness. When the second sealing portion 80 described below is formed with the adhesive film disposed between the exterior film 50 and the lid 60, the adhesive film is less likely to shift position relative to the lid 60 and the exterior film 50. By incorporating a tackifier resin into the heat-sealable resin layer of the adhesive film, adhesiveness can be imparted to the adhesive film. Examples of the tackifier resin include amorphous polyolefins. Examples of amorphous polyolefins include amorphous polypropylene and copolymers of amorphous propylene and other α-olefins. The content of the tackifier resin relative to the base material constituting the heat-sealable resin is preferably 10 to 20% by weight or less.

[0052] The lid body 60 has a main body 60A. The main body 60A has a first surface 61, a second surface 62, and a sealing surface 63. The first surface 61 faces the electrode body 20. The second surface 62 is the surface opposite to the first surface 61. The sealing surface 63 is connected to the first surface 61 and the second surface 62, and is joined to the heat-sealable resin layer 53 of the exterior film 50.

[0053] The sealing surface 63 includes a first sealing surface 63A, a second sealing surface 63B, a third sealing surface 63C, and a fourth sealing surface 63D. The first sealing surface 63A constitutes the upper surface of the lid body 60. The first sealing surface 63A extends in a first direction (the LR direction in this embodiment) when viewed from the front of the lid body 60. The second sealing surface 63B and the third sealing surface 63C are connected to the first sealing surface 63A and constitute the side surfaces of the lid body 60. The second sealing surface 63B and the third sealing surface 63C extend in a second direction (the UD direction in this embodiment) that intersects with the first direction when viewed from the front of the lid body 60. In this embodiment, the first direction and the second direction are orthogonal when viewed from the front of the lid body 60. The first direction and the second direction do not have to be orthogonal when viewed from the front of the lid body 60. The fourth sealing surface 63D constitutes the lower surface of the lid body 60. The fourth sealing surface 63D extends in a first direction (LR direction in this embodiment) when the lid 60 is viewed from the front.

[0054] When the main body 60A is plate-shaped, it is preferable that the main body 60A have a certain thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is placed on top of it. From another perspective, when the main body 60A is plate-shaped, it is preferable that the sealing surface 63 of the main body 60A have a certain thickness so that the sealing surface 63 of the main body 60A and the exterior film 50 can be heat-sealed appropriately when forming the second sealing section 80 described below. The minimum thickness of the main body 60A is, for example, 1.0 mm, more preferably 3.0 mm, and even more preferably 4.0 mm. The maximum thickness of the main body 60A is, for example, 20 mm, more preferably 15 mm, and even more preferably 10 mm. The maximum thickness of the main body 60A may be 20 mm or more. The preferred ranges for the thickness of the material constituting the main body 60A are 1.0 mm to 20 mm, 1.0 mm to 15 mm, 1.0 mm to 10 mm, 3.0 mm to 20 mm, 3.0 mm to 15 mm, 3.0 mm to 10 mm, 4.0 mm to 20 mm, 4.0 mm to 15 mm, and 4.0 mm to 10 mm. In this embodiment, when the main body 60A is described as being plate-shaped, films defined by the JIS (Japanese Industrial Standards) "Packaging Terminology" standard are not included as materials constituting the main body 60A. The thickness of the main body 60A may vary depending on the region of the main body 60A. When the thickness of the main body 60A varies depending on the region, the thickness of the main body 60A is the thickness of the thickest portion.

[0055] The main body 60A further includes boundaries 64, 65, 66, and 67. The boundary 64 is the boundary between the first seal surface 63A and the second seal surface 63B. The boundary 65 is the boundary between the first seal surface 63A and the third seal surface 63C. The boundary 66 is the boundary between the fourth seal surface 63D and the second seal surface 63B. The boundary 67 is the boundary between the fourth seal surface 63D and the third seal surface 63C. The shapes of the boundaries 64 to 67 may be angular, or may be rounded by applying a rounding process. In this embodiment, the boundaries 64 to 67 are angular.

[0056] Examples of materials constituting the main body 60A include polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin, polyolefin resins such as polyethylene resin, fluorine-based resin, and polypropylene resin, cyclic polyolefin resin, and acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. From the viewpoint of effectively heat-sealing the main body 60A and the exterior film 50, it is preferable that the main material of the main body 60A and the material constituting the heat-sealable resin layer 53 of the exterior film 50 are the same. In this embodiment, the main material of the main body 60A and the material constituting the heat-sealable resin layer 53 are, for example, polyolefin resins such as polyethylene resin and polypropylene resin, or acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. The term "main material" refers to a material that accounts for 50% or more of the materials contained in the constituent elements.

[0057] In this embodiment, a through-hole 60X into which the electrode terminal 30 is inserted is formed in the main body 60A. The through-hole 60X penetrates the first surface 61 and the second surface 62. When the electrode body 20 is wrapped in the exterior film 50, the electrode terminal 30 passes through the through-hole 60X formed in the main body 60A and protrudes to the outside of the exterior body 40. A small gap between the through-hole 60X of the main body 60A and the electrode terminal 30 is filled with, for example, resin. Note that, in the energy storage device 10, the position from which the electrode terminal 30 protrudes to the outside can be selected arbitrarily. For example, the electrode terminal 30 may protrude to the outside from a hole formed in any one of the six surfaces of the exterior body 40. In this case, a small gap between the exterior body 40 and the electrode terminal 30 is filled with, for example, resin or film. In another example, the electrode terminal 30 may protrude to the outside of the exterior body 40 from between the sealing surface 63 of the main body 60A and the exterior film 50. In this case, the through-hole 60X does not have to be formed in the lid 60. In the electricity storage device 10, the main body 60A and the electrode terminal 30 are provided as separate bodies, but the main body 60A and the electrode terminal 30 may be formed integrally. Note that, even if the electrode terminal 30 does not protrude from the edge of the exterior body 40, the main body 60A does not have to have the through-hole 60X.

[0058] In the manufacturing process of the electricity storage device 10, an intermediate body is manufactured in which lid bodies 60 are placed on both ends of the electrode body 20. The intermediate body is moved to a work site for the next process. In this embodiment, a fixing jig 100 is attached to the intermediate body during the process of moving the intermediate body in order to fix the position of the lid body 60 relative to the electrode body 20. Therefore, the lid body 60 has, in addition to a main body 60A, a protrusion 60B to which the fixing jig 100 is attached.

[0059] The protrusion 60B protrudes from the second surface 62 of the main body 60A. The number of protrusions 60B provided on the lid 60 can be selected arbitrarily. In this embodiment, the lid 60 has two protrusions 60B. The lid 60 may have one, or three or more protrusions 60B. The position on the second surface 62 from which the protrusion 60B protrudes can be selected arbitrarily. When a through hole 60X is formed in the main body 60A as in this embodiment, it is preferable that the protrusion 60B be formed at a position away from the through hole 60X so that the electrode terminal 30 and the protrusion 60B do not interfere with each other.

[0060] The specific configuration of the protrusion 60B can be selected arbitrarily as long as it can secure the fixing jig 100. In this embodiment, the protrusion 60B is a fixing component embedded in the main body 60A. The fixing component is, for example, an insert nut. The insert nut has a female or male thread. As shown in FIG. 5 , the end of the protrusion 60B opposite the end protruding from the second surface 62 is embedded inside the main body 60A. In other words, the protrusion 60B does not penetrate the main body 60A. When the insert nut is made of a metal material, it is preferable to subject the insert nut to a corrosion-resistant treatment such as chromate treatment to increase the bonding strength with the lid 60. The load-bearing capacity of one insert nut is preferably equal to or greater than the weight of the power storage device 10 divided by the total number of protrusions 60B. Note that the fixing component may have at least one of a suction cup, a magnet, a protrusion, a Velcro (registered trademark), a spring pin, and a clamp to secure the fixing jig 100.

[0061] 6, the fixing jig 100 includes a lid fixing portion 110 to which the lid body 60 is fixed, and a mounting portion 120 on which the electrode body 20 is placed. The lid fixing portion 110 and the mounting portion 120 are connected by any means. The lid fixing portion 110 and the mounting portion 120 may be integrally formed.

[0062] The lid fixing part 110 has a support part 111 on which the lid body 60 is placed and a wall part 112 rising from the support part 111. Holes 112X corresponding to the number of protrusions 60B are formed in the wall part 112. The lid body 60 is fixed to the lid fixing part 110 by meshing a thread formed on an insert nut constituting the protrusion 60B with a male or female thread. If the thread formed on the insert nut constituting the protrusion 60B is a female thread, the female thread meshes with a male thread inserted into the hole 112X. If the thread formed on the insert nut constituting the protrusion 60B is a male thread, the male thread meshes with a female thread formed on a nut, a socket, or the like. The female thread may be entirely disposed outside the hole 112X, or at least a portion may be inserted into the hole 112X. The wall part 112 further has a slit 112Y formed therein into which the electrode terminal 30 is inserted. The slit 112Y penetrates the wall part 112. The wall portion 112 may include a plurality of divided parts, and may be configured so that the electrode terminal 30 is sandwiched between the plurality of parts. When the lid body 60 also functions as an electrode terminal, the slit 112Y may be omitted. The mounting portion 120 is, for example, plate-shaped, and mounts substantially the entire electrode body 20 thereon. The fixing jig 100 may be attached to the completed electricity storage device 10. That is, the fixing jig 100 may also be used when the electricity storage device 10 is in use.

[0063] In this embodiment, the first sealing portion 70 is formed by wrapping the exterior film 50 around the electrode body 20 so as to have an opening 40A, and then heat-sealing the opposing surfaces (heat-fusible resin layers 53) of the exterior film 50 together.

[0064] The first sealed portion 70 is formed by heat-sealing a portion of the exterior film 50 including the first edge 50A and a portion of the exterior film 50 including the second edge 50B shown in FIG. 4 . The first sealed portion 70 extends in the longitudinal direction (FB direction) of the exterior body 40. The position at which the first sealed portion 70 is formed in the exterior body 40 can be selected arbitrarily. In the present embodiment, the base 70X of the first sealed portion 70 is preferably located on the edge 43 at the boundary between the first surface 41 and the second surface 42 of the exterior body 40. The first surface 41 has a larger area than the second surface 42. The base 70X of the first sealed portion 70 may be located on any surface of the exterior body 40. In the present embodiment, the first sealed portion 70 protrudes outward beyond the electrode assembly 20 in a plan view. The first sealed portion 70 may be folded, for example, toward the second surface 42 or the first surface 41 of the exterior body 40.

[0065] In this embodiment, the second sealed portion 80 is formed by heat-sealing the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid 60. Hereinafter, the seal strength between the heat-sealable resin layer 53 of the exterior film 50 and the sealing surface 63 of the lid 60 may be referred to as the seal strength of the second sealed portion 80. The seal strength of the second sealed portion 80 is the seal strength between the heat-sealable resin layer 53 and the lid 60 at the long side portion of the sealing surface 63, i.e., the sealing surface 63 extending in the L-R (width) direction in FIG. 1A .

[0066] The seal strength of the second sealing portion 80 is measured as follows. First, a slit is made in the portion of the exterior film 50 that constitutes the first surface 41 of the exterior body 40, forming three strip-shaped members 41X, 41Y, and 41Z (see the two-dot chain lines in FIG. 1B) aligned in the L-R direction. The width of the three strip-shaped members 41X, 41Y, and 41Z in the L-R direction is 15 mm. The ends of the strip-shaped members 41X, 41Y, and 41Z are joined to the lid body 60 at the second sealing portion 80. The length of the lid body 60 in the L-R direction is 45 mm or more. Next, the end of each of the strip-shaped members 41X, 41Y, and 41Z opposite the end joined to the lid body 60 is pulled upward in the UD direction (away from the first surface 41B), thereby measuring the seal strength of each of the strip-shaped members 41X, 41Y, and 41Z. In this embodiment, the seal strength of the second sealing portion 80 is the average value of the seal strengths of the strip-shaped members 41X, 41Y, and 41Z. When the length of the lid 60 in the L-R direction is less than 45 mm, three strip-shaped members with an arbitrary width X mm, less than 15 mm, are formed. The seal strengths of the three strip-shaped members are measured in the same manner as when the length of the lid 60 in the L-R direction is 45 mm or more. The obtained seal strengths are each divided by the arbitrary width X mm and multiplied by 15 to convert them to the seal strengths of the three strip-shaped members in a 15 mm width. The seal strength of the second sealing portion 80 is the average value of the seal strengths of the three strip-shaped members converted to a 15 mm width. Note that when the lid 60 is divided into multiple parts including long and short sides, the seal strength of the second sealing portion 80 is the seal strength of the long sides of the sealing surfaces 63 of the multiple parts.

[0067] From the viewpoint of suitably maintaining the state in which the electrode assembly 20 is sealed by the exterior housing 40, the seal strength of the second sealing unit 80 is preferably 40 N / 15 mm or more, more preferably 50 N / 15 mm or more, even more preferably 60 N / 15 mm or more, even more preferably 70 N / 15 mm or more, and even more preferably 85 N / 15 mm or more. When the seal strength of the second sealing unit 80 is 40 N / 15 mm or more, the state in which the electrode assembly 20 is sealed by the exterior housing 40 is suitably maintained even after the electricity storage device 10 has been used for, for example, several years (less than 10 years). When the seal strength of the second sealing unit 80 is 85 N / 15 mm or more, the state in which the electrode assembly 20 is sealed by the exterior housing 40 is suitably maintained even after the electricity storage device 10 has been used for, for example, 10 years or more. The seal strength of the second sealing unit 80 is preferably 300 N / 15 mm or less. A preferred range for the seal strength of the second sealing portion 80 is 40N / 15mm to 300N / 15mm, 50N / 15mm to 300N / 15mm, 60N / 15mm to 300N / 15mm, 70N / 15mm to 300N / 15mm, or 85N / 15mm to 300N / 15mm.

[0068] <1-2. Method for manufacturing electricity storage devices> 7 is a flowchart showing an example of a method for manufacturing the electricity storage device 10. The method for manufacturing the electricity storage device 10 includes, for example, a first step, a second step, a third step, a fourth step, a fifth step, a sixth step, a seventh step, an eighth step, and a ninth step. The first step to the ninth step are performed, for example, by a manufacturing apparatus for the electricity storage device 10. Note that the following first step to ninth step are simply names of the steps in the method for manufacturing the electricity storage device 10 specified for convenience, and do not necessarily refer to the order of the steps.

[0069] In the first process (lid unit manufacturing process) of step S11, the manufacturing device manufactures a pair of lid units 60Z in which the lid body 60 and the electrode terminal 30 are joined together.

[0070] The second process (connecting process) of step S12 is performed after the first process. In the second process, the manufacturing apparatus places a pair of lid units 60Z on both ends of the electrode body 20, and electrically connects the electrode terminals 30 and the electrode body 20.

[0071] FIG. 8 is a diagram relating to the second step. In the second step, the manufacturing equipment uses a positioning device (not shown) to position the pair of lid units 60Z relative to the electrode assembly 20. In the second step, the pair of lid units 60Z is positioned relative to the electrode assembly 20, for example, based on the long side PA and short side PB of the electrode assembly 20 in a plan view. As the positioning device, for example, a known image processing device can be used. In this embodiment, an image processing device manufactured by Keyence Corporation is used as the image processing device. The detection method of the image processing device is edge position measurement using transmission inspection. The resolution of the image processing device is 0.01 mm. In this embodiment, the image processing device detects the short side PB by transmission inspection, and the amount of correction with respect to the reference side on the opposite side is calculated from the position information. After the second step is completed, a fixing jig 100 (see FIG. 6) is attached to the intermediate body including the electrode assembly 20 and the pair of lid units 60Z. The intermediate body, with the fixing jig 100 attached, is transported to a work site for the third step.

[0072] The third step (winding step) of step S13 is performed after the second step. In the third step, the fixing jig 100 is removed from the intermediate body. In the third step, the manufacturing equipment wraps the exterior film 50 around the electrode body 20 and the lid body 60. In the third step, the exterior film 50 is positioned relative to the intermediate body based on the long side PA and short side PB set in the second step. In addition, in the third step, an exterior film 50 having a larger area than the exterior film 50 of the finished electricity storage device 10 is used to form the protruding portion 90 (see FIG. 16 ).

[0073] 9 to 11 are diagrams relating to the third step. In the third step, the manufacturing apparatus places the electrode assembly 20 on the exterior film 50. By placing the electrode assembly 20 on the exterior film 50, one of the pair of first surfaces 41 of the exterior body 40 is formed. The manufacturing apparatus wraps the exterior film 50 around the electrode assembly 20 and the lid body 60 while pressing at least one of the electrode assembly 20 and the lid body 60, which are placed on the exterior film 50, against the exterior film 50. In this embodiment, the electrode assembly 20 and the lid body 60 are pressed against the exterior film 50 by, for example, a bar-shaped pressing member 130. Since the third step can be performed with the electrode assembly 20 and the lid body 60 placed on a table on which the exterior film 50 is placed, the exterior film 50 can be easily wrapped around the electrode assembly 20 and the lid body 60. Note that the bar-shaped pressing member 130 preferably comes into contact with substantially the entire upper surfaces of the electrode assembly 20 and the lid body 60.

[0074] 10 , in the third step, the exterior film 50 is folded to form one of the pair of second surfaces 42 of the exterior body 40. After the exterior film 50 is folded, a portion of the exterior film 50 corresponding to a corner of the lid body 60 is pressed against the lid body 60 by, for example, a bar-shaped pressing member 140. Note that the pressing member 140 may have a shape that presses the entire second surface 42 against the electrode body 20 and the lid body 60, or may be, for example, L-shaped so as to correspond to the corner between the first surface 41 and the second surface 42.

[0075] 11 , in a third step, the exterior film 50 is folded to form the other second surface 42 of the pair of second surfaces 42 of the exterior body 40. After the exterior film 50 is folded, the portion of the exterior film 50 that corresponds to the corner of the lid body 60 is pressed against the lid body 60 by, for example, a bar-shaped pressing member 150.

[0076] Next, after the pressing member 130 (see FIG. 9) is separated from the electrode body 20, the exterior film 50 is folded so that the other of the pair of first surfaces 41 of the exterior body 40 is formed.

[0077] Furthermore, in the winding process, in order to prevent wrinkles and sagging in the exterior film 50, it is preferable that the manufacturing device pulls the portion of the exterior film 50 corresponding to the protrusion 90 (see Figure 16) in any direction with a predetermined strength.

[0078] 12 is an example of a graph showing the relationship between strain and stress acting on the exterior film 50. If the strain and stress acting on the exterior film 50 are too small, sagging occurs in the exterior film 50 wrapped around the electrode body 20. In this embodiment, to prevent sagging from occurring in the exterior film 50, a predetermined strength is determined so that the strain acting on the exterior film 50 is equal to or greater than a lower limit XA (%) and so that the stress acting on the exterior film 50 is equal to or greater than a lower limit YA (MPa).

[0079] On the other hand, if the strain and stress acting on the exterior film 50 are too large, wrinkles will occur in the exterior film 50 wrapped around the electrode body 20. In this embodiment, to prevent wrinkles from occurring in the exterior film 50, a predetermined strength is determined so that the strain acting on the exterior film 50 is equal to or less than an upper limit value XB (%) and so that the stress acting on the exterior film 50 is equal to or less than an upper limit value YB (MPa).

[0080] That is, in this embodiment, in the winding process, the portion of the exterior film 50 corresponding to the protruding portion 90 is pulled with a predetermined strength, so that the strain acting on the exterior film 50 falls within a range of not less than a lower limit XA (%) and not more than an upper limit XB (%), and the stress acting on the exterior film 50 falls within a range of not less than a lower limit YA (MPa) and not more than an upper limit YB (MPa). An example of the lower limit XA is 0.10 (%). An example of the upper limit XB is 0.43 (%). An example of the lower limit YA is 1.1 (MPa). An example of the upper limit YB is 13.2 (MPa).

[0081] The fourth step of step S14 is performed after the third step. As shown in Fig. 13, in the fourth step, the manufacturing device forms a first FB-direction sealed portion 71 having an unsealed portion 71Z in the center of the portion of the exterior film 50 where the protruding portion 90 is to be formed. The first FB-direction sealed portion 71 extends in the FB direction. The hatched portion in Fig. 13 indicates an example of the region where the first FB-direction sealed portion 71 is to be formed.

[0082] The fifth step (sealing step) of step S15 is performed before or after the fourth step. The fifth step may also be performed in parallel with the third step. As shown in FIG. 14, in the fourth step, the manufacturing apparatus forms the second sealing portion 80. In the fifth step, it is preferable that the second sealing portion 80 is formed with the fixing jig 100 attached to the lid body 60. The hatched portion shown in FIG. 14 indicates an example of the region where the second sealing portion 80 is formed.

[0083] As shown in FIG. 15, the fifth step preferably includes a first sealing step of step S21 and a re-sealing step of step S22 that is carried out after the first sealing step.

[0084] In the first sealing step, the manufacturing apparatus preferably forms the second sealed portion 80 while moving one of the sealing device 160 (see FIG. 16 ) and the lid body 60 relative to the other, from the viewpoint of suitably joining the boundaries 64-67 of the lid body 60, in particular, to the packaging film 50. In this embodiment, the second sealed portion 80 is formed while the sealing device 160 moves relative to the lid body 60. In this embodiment, for example, an ultrasonic sealing device or a welding machine is used as the sealing device 160. The sealing device 160 may be, for example, a heat sealing device using rollers, or a heat sealing device using a seal bar that is shorter than any of the sealing surfaces 63A-63D of the lid body 60.

[0085] FIG. 16 is a diagram illustrating the first sealing step. In the first sealing step, the sealing device 160 preferably sequentially joins adjacent sealing surfaces to the exterior film 50. The sealing device 160 moves, for example, passing through the first sealing surface 63A, the third sealing surface 63C, the fourth sealing surface 63D, and the second sealing surface 63B in this order. The sealing device 160 may also move through the second sealing surface 63B, the fourth sealing surface 63D, the third sealing surface 63C, and the first sealing surface 63A in this order. In the first sealing step, for example, the second sealing portion 80 may be formed using two sealing devices 160. For example, one sealing device 160 may start moving from the boundary 67 and move through the third sealing surface 63C and the first sealing surface 63A in this order. The other sealing device 160 may start moving from the boundary 67 and move through the fourth sealing surface 63D and the second sealing surface 63B in this order. In the first sealing step, the sealing device 160 may start moving from the middle of the first sealing surface 63A, the second sealing surface 63B, the third sealing surface 63C, or the fourth sealing surface 63D.

[0086] The resealing step of step S22 is carried out from the viewpoint of further increasing the sealing strength of the second sealing portion 80. The method of the resealing step can be selected arbitrarily. For example, the resealing step may be the same method as the first sealing step. In the resealing step, the first sealing surface 63A to the fourth sealing surface 63D may be heat-sealed in any order using a sealing bar.

[0087] The sixth step of step S16 is performed before or after the fifth step. The sixth step may be performed in parallel with the fourth step. As shown in FIG. 17, in the sixth step, the manufacturing apparatus forms a first LR seal portion 72 extending in the LR direction. In the sixth step, the first LR seal portion 72 is formed so as to partially overlap the first FB seal portion 71 in a portion including the root 70X. Completion of the sixth step results in the formation of a protruding portion 90 having a larger area in a plan view than the first sealing portion 70 included in the finished power storage device 10. Note that the hatched portion in FIG. 17 indicates an example of the region where the first LR seal portion 72 is formed.

[0088] The seventh step of step S17 is performed after the sixth step. In the seventh step, the manufacturing apparatus injects an electrolyte solution through the opening 90X of the protruding portion 90. After the seventh step, the edge of the protruding portion 90, including the opening 90X, is heat-sealed, and an aging step is performed. Gas generated during the aging step is discharged through the opening 90X.

[0089] The eighth step of step S18 is performed after the aging step is completed. As shown in FIG. 18, in the eighth step, the manufacturing equipment forms the first sealing portion 70. In the eighth step, the first FB direction seal portion 71 and the first LR direction seal portion 72 are also resealed. Note that the hatched area in FIG. 18 indicates an example of the region where the first sealing portion 70 is formed.

[0090] The ninth step of step S19 is performed after the eighth step. In the ninth step, the manufacturing equipment cuts off the portion of the protruding portion 90 other than the first sealing portion 70. The dashed-dotted line X shown in FIG. 18 is an example of a line indicating the position where the protruding portion 90 is cut off in the ninth step.

[0091] <1-3.Transportation jig> In the above embodiment, a transport jig 200 may be used to transport the electrode assembly 20, an intermediate product, or a completed electricity storage device 10 (hereinafter, these will be referred to as "objects to be transported"). Fig. 19 is a side view of the electricity storage device 10 to which the transport jig 200 is attached. Fig. 20 is a plan view of Fig. 19.

[0092] The transport jig 200 includes a pair of plates 211, 212 and a connecting portion 213 that connects the pair of plates 211, 212. The plate 211 covers one first surface 41 of the exterior body 40. The plate 212 covers the other first surface 41 of the exterior body 40. A handle 211A is attached to the plate 211. This allows an operator to easily hold the transport jig 200. The handle 211A can be omitted.

[0093] The area of ​​the pair of plates 211, 212 in a plan view is larger than the area of ​​the first surface 41 of the exterior body 40. Therefore, the pair of plates 211, 212 protrude from the first surface 41 in the L-R direction. Holes 211X, 212X into which the connecting portion 213 is inserted are formed in the portions of the pair of plates 211, 212 protruding from the first surface 41.

[0094] The specific configuration of the connecting portion 213 can be selected arbitrarily as long as it is a configuration that can connect the pair of plates 211, 212. It is preferable that the connecting portion 213 is detachable from the pair of plates 211, 212 so that the transportation jig 200 can be easily attached to and detached from the object to be transported. In this embodiment, the connecting portion 213 is a bolt. The connecting portion 213 is inserted into the holes 211X, 212X, for example, and fixed to the pair of plates 211, 212 by nuts.

[0095] The number of connecting portions 213 provided in the transportation jig 200 can be selected arbitrarily. In this embodiment, the transportation jig 200 has six connecting portions 213. The transportation jig 200 may have one to five, or seven or more connecting portions 213.

[0096] <1-4. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10, the protrusion 60B is formed on the lid 60, and therefore the fixing jig 100 can be attached to the protrusion 60B. Since the position of the lid 60 relative to the electrode assembly 20 in the intermediate body can be fixed, the position of the lid 60 relative to the electrode assembly 20 can be accurately determined.

[0097] [2. Modifications] The above-described embodiments are examples of possible forms of the electricity storage device, lid, fixing jig, electricity storage device manufacturing method, and transport jig according to the present invention, and are not intended to limit the forms. The electricity storage device, lid, fixing jig, electricity storage device manufacturing method, and transport jig according to the present invention may take forms different from those exemplified in the embodiments. Examples of such forms include forms in which part of the configuration of the embodiments is replaced, modified, or omitted, or forms in which a new configuration is added to the embodiments. Some examples of modified embodiments are shown below. Note that the following modified forms can be combined with each other as long as there is no technical contradiction.

[0098] <2-1> In the above embodiment, the configuration of the lid 60 can be modified as desired. FIG. 21 is a perspective view of a modified lid 260. The lid 260 may include a main body 60A and a thick portion 261 protruding from the second surface 62 of the main body 60A. The number of thick portions 261 included in the lid 260 can be selected as desired. In the example shown in FIG. 21, the lid 260 includes four thick portions 261. The lid 260 may include one to three, or five or more thick portions 261. A hole 260X is formed in the thick portion 261 and the main body 60A. It is preferable that the hole 260X does not penetrate the thick portion 261 and the main body 60A. In this modified example, the protrusion 60B is a screw inserted into the hole 260X. An arbitrary fixing member may be inserted into the hole 260X. A female thread may be formed on the inner circumferential surface of the hole 260X. 21 , a thick portion may be formed on the first surface 61 of the main body 60A at a position facing the thick portion 261 across the main body 60A. In this case, it is preferable that the hole 260X does not pass through the thick portion 261, the main body 60A, or the thick portion formed on the first surface 61. Note that the thick portion 261 and the thick portion formed on the first surface 61 do not have to face each other across the main body 60A. In other words, the thick portion may be formed on at least one of the first surface 61 and the second surface 62.

[0099] Fig. 22 is a perspective view of a lid 360 according to another modification. The lid 360 may include a main body 60A and a protruding portion 360B protruding from the second surface 62 of the main body 60A. The protruding portion 360B may be formed integrally with the main body 60A. The protruding portion 360B has a shape corresponding to a pull-out pin provided to suppress warping of the lid 60 when the lid 360 is insert-molded, for example. Note that in Fig. 22, the number of protruding portions 360B may be one, two, or four or more.

[0100] FIG. 23 is a side view of an electricity storage device 10 including a lid 460 according to yet another modification. The lid 460 has a protrusion 460B. The protrusion 460B has a breakage 460X. The breakage 460X is a thinned portion of the protrusion 460B. The position at which the breakage 460X is formed in the protrusion 460B can be selected arbitrarily. In this embodiment, the breakage 460X is formed in the middle of the protrusion 460B. The breakage 460X may also be formed at the base of the protrusion 460B. In the manufacturing process of the electricity storage device 10, the position of the protrusion 460B relative to the electrode assembly 20 is fixed by a fixing jig 471. Movement of the electrode assembly 20 is restricted by a fixing jig 472. After, for example, the ninth step (see FIG. 7) of the manufacturing process of the electricity storage device 10 is completed, the fixing jig 471 is removed from the protruding portion 460B, and the protruding portion 460B is broken at the breaking portion 460X. Since the protruding portion 460B is shortened, the volume of the lid body 460 and the volume of the electricity storage device 10 can be reduced. Therefore, the energy density of the electricity storage device 10 can be increased.

[0101] <2-2> In the above embodiment, the configuration of the lid fixing portion 110 of the fixing jig 100 can be changed as desired. Fig. 24 is a perspective view of a modified lid fixing portion 510. The lid fixing portion 510 can be used to fix the lid body 360 shown in Fig. 22, for example.

[0102] The lid fixing portion 510 has a first fixing portion 511 and a second fixing portion 512 configured to sandwich the protrusion 360B. The first fixing portion 511 has three recesses 511A recessed on the side opposite the second fixing portion 512. The second fixing portion 512 has three recesses 512A recessed on the side opposite the first fixing portion 511. The protrusion 360B is sandwiched and fixed between the recesses 511A and 512A facing each other. Of the three recesses 511A, cushioning material 520 is preferably disposed in the recesses 511A at both ends. The cushioning material 520 is preferably flexible so that it can deform to fit the shape of the protrusion 360B. Because the cushioning material 520 can flexibly deform to fit the shape of the protrusion 360B when sandwiching the protrusion 360B, the protrusion 360B can be suitably fixed even if there is some individual variation in the shape of the protrusion 360B. Furthermore, the protruding portion 360B is less likely to be damaged because it is protected by the buffer material 520. The number of recesses 511A, 512A formed in the lid fixing portion 510 can be changed as desired depending on the number of protruding portions 360B of the lid body 360 to be fixed.

[0103] <2-3> In the above embodiment, in order to improve the adhesion between the exterior film 50 and the electrode assembly 20, as shown in FIG. 25 , a strip-shaped member 700 may be wrapped around the electrode assembly 20 and bonded to the inner surface of the exterior film 50. Any material may be used for the strip-shaped member 700. For example, the strip-shaped member 700 may be a sheet made of an olefin resin. The strip-shaped member 700 may be bonded to the inner surface of the exterior film 50 with an adhesive or the like, or may be bonded to the inner surface of the exterior film 50 by heat sealing. The strip-shaped member 700 may or may not be bonded to the electrode assembly 20. In order to improve the adhesion between the exterior film 50 and the electrode assembly 20, it is preferable that the strip-shaped member 700 be bonded to the electrode assembly 20. The position around the electrode assembly 20 around which the strip-shaped member 700 is wrapped can be selected arbitrarily. In the example shown in FIG. 25 , the strip-shaped member 700 is wrapped around the electrode assembly 20 approximately in the center in the FB direction. In this modification, the protruding portion 60B of the lid 60 may be omitted.

[0104] <2-4> In the above embodiment, the third step (winding step) of the manufacturing method for the electricity storage device 10 can be changed as desired. For example, in the above embodiment, the size of the exterior film 50 used in the third step is such that it does not protrude from the sealing surface 63 of the lid body 60 in the FB direction. However, as shown in FIG. 26 , the exterior film 50 may have an excess portion 50X that protrudes from the sealing surface 63 of the lid body 60. The excess portion 50X is preferably cut off or folded in a desired direction in a desired step performed after the winding step.

[0105] <2-5> In the above embodiment, the fifth step (sealing step) of the manufacturing method for the electricity storage device 10 can be selected arbitrarily. For example, in the fifth step, from the viewpoint of improving the sealing performance of the boundaries 64 to 67 of the lid body 60, it is preferable to sequentially join adjacent sealing surfaces of the lid body 60. For example, as shown in FIG. 27 , when a sealing bar 610 of a heat-sealing device is used, it is preferable to join the first sealing surface 63A, the third sealing surface 63C, the fourth sealing surface 63D, and the second sealing surface 63B to the exterior film 50 in this order. In another example, the second sealing surface 63B, the fourth sealing surface 63D, the third sealing surface 63C, and the first sealing surface 63A may be joined to the exterior film 50 in this order. The first sealing surface 63A and the fourth sealing surface 63D may be heat-sealed before the second sealing surface 63B and the third sealing surface 63C of the lid body 60.

[0106] In the fifth step (sealing step), the second sealed portion 80 may be formed using a heat-sealing device. In this modification, it is preferable to control the amount of pressure applied by the seal bar 610 of the heat-sealing device to the exterior film 50 and the lid 60. When the pressure of the seal bar 610 is controlled, the heat-sealable resin layer 53 of the exterior film 50 may melt excessively, forming a pool of polymer between the sealing surface 63 of the lid 60 and the exterior film 50. Such a pool of polymer can cause cracks in the exterior film 40. For this reason, it is preferable to control the amount of pressure applied by the seal bar 610 so that the heat-sealable resin layer 53 does not melt excessively. Note that the amount of pressure applied by the seal bar 610 is the distance by which the seal bar 610 approaches the lid 60 from the reference position, where the position at which the seal bar 610 contacts the surface of the exterior film 50 is defined as the reference position. The amount of pressure applied is preferably, for example, approximately half the thickness of the heat-sealable resin layer 53.

[0107] The amount of depression of the seal bar 610 can be controlled, for example, by an electric cylinder 800 connected to the seal bar 610 shown in Fig. 28. A known electric cylinder 800 can be used. The electric cylinder 800 includes a main body 810 including a motor and the like, and a rod 820 whose protrusion amount relative to the main body 810 changes. The seal bar 610 is fixed to the tip of the rod 820.

[0108] FIG. 28 is a diagram showing the initial position of the seal bar 610. FIG. 29 is a diagram showing the reference position of the seal bar 610. As shown in FIG. 28, in the initial position of the seal bar 610, the seal bar 610 is separated from the exterior film 50 and the lid body 60. In the initial position, as the amount of protrusion of the rod 820 relative to the main body 810 increases, the seal bar 610 approaches the exterior film 50 and the lid body 60, and reaches the reference position shown in FIG. 29. Note that instead of the electric cylinder 800, an air cylinder connected to the seal bar 610 may be used to control the amount of depression of the seal bar 610. When an air cylinder is used instead of the electric cylinder 800, it is preferable to arrange a regulating member around the intermediate body that cushions against the seal bar 610 at a position where the seal bar 610 is depressed to prevent the seal bar 610 from being depressed beyond a predetermined amount of depression.

[0109] Furthermore, from the viewpoint of suppressing the formation of polymer puddles, it is preferable to form the second sealing portion 80 in as short a time as possible. Therefore, in the above embodiment, it is preferable to preheat the lid body 60 in any step performed before the fifth step. By preheating the lid body 60, for example, even if the melting point of the material constituting the lid body 60 is equal to or higher than the melting point of the material constituting the heat-sealable resin layer 53 of the exterior film 50, the second sealing portion 80 can be formed in a short time. Depending on the method for forming the second sealing portion 80, the first sealing surface 63A, the second sealing surface 63B, the third sealing surface 63C, and the fourth sealing surface 63D may be heated simultaneously or in any order. The lid body 60 can be heated by any means, such as a heater bar, ultrasonic waves, or an infrared lamp.

[0110] The surface of the sealing surface 63 of the lid 60 may have minute irregularities. Therefore, when the second sealing portion 80 is formed using a heat-sealing device, the seal strength may vary from one portion of the second sealing portion 80 to another. Furthermore, the size of the polymer pool formed between the exterior film 50 and the lid 60 may also vary. To minimize the variation in seal strength and the size of the polymer pool, when using a heat-sealing device in the fifth step, it is preferable to form the second sealing portion 80 with a heat-resistant elastomer 910 sandwiched between the seal bar 610 and the exterior film 50, as shown in FIG. 30 . The material constituting the elastomer 910 is an elastomer having a melting point equal to or higher than the heat-sealing temperature. The material constituting the elastomer 910 may be, for example, a rubber sheet, a silicone sheet, a urethane sheet, or a fluororesin sheet.

[0111] Similarly, from the viewpoint of reducing variations in the seal strength of the second sealing portion 80, when a heat sealing device is used in the fifth step, it is preferable to form the second sealing portion 80 with at least the lid body 60 placed on the elastic body 920. The electrode body 20 may be placed on the elastic body 920. In addition to the materials exemplified as the materials for the elastic body 910, sponge may also be used as the material for the elastic body 920. In the example shown in FIG. 30, the elastic body 910 or the elastic body 920 can be omitted.

[0112] <2-6> In the above embodiment, the first and second steps can be changed as desired in the method for manufacturing the electricity storage device 10. Fig. 31 is a flowchart showing a modified example of the method for manufacturing the electricity storage device 10. The modified example of the method for manufacturing the electricity storage device 10 includes a 31st step and a 32nd step.

[0113] In a 31st step (connecting step) of step S31, the manufacturing equipment connects the electrode body 20 and the electrode terminal 30 together.

[0114] The 32nd step (arranging step) of step S32 is performed after the 31st step. In the 32nd step, the manufacturing equipment arranges lid bodies 60 on both ends of the electrode assembly 20. FIG. 32 is a diagram relating to the 32nd step. Hereinafter, the electrode terminal 30 and lid body 60 arranged on one side of the electrode assembly 20 will be referred to as the electrode terminal 30L and the lid body 60L, respectively. The electrode terminal 30 and lid body 60 arranged on the other side of the electrode assembly 20 will be referred to as the electrode terminal 30R and the lid body 60R, respectively.

[0115] The manufacturing equipment uses an image processing device (not shown) to position one lid body 60L relative to one electrode terminal 30L. As shown in FIG. 31 , in the placement process, for example, the positioning of one lid body 60L relative to one electrode terminal 30L is performed based on the long side PAX and short side PBX of one electrode terminal 30L in a plan view. The image processing device detects the short side PBX by transmission inspection and calculates the amount of correction with respect to the reference side on the opposite side from the position information. Next, the manufacturing equipment positions the other lid body 60R relative to the other electrode terminal 30R based on the long side PAX and short side PBX of one electrode terminal 30L.

[0116] The positioning of the other lid body 60R may be performed with respect to the other electrode terminal 30R based on the long side PAY and short side PBY of the other electrode terminal 30R in a plan view. Note that in the third step (winding step), the positioning of the exterior film 50 with respect to the intermediate body may be performed based on the long side PAX and short side PBX or the long side PAY and short side PBY set in the arrangement step.

[0117] <2-7> In the above embodiment, the lid body 60 may be formed with a recess recessed from the second surface 62 toward the first surface 61 in addition to or instead of the protrusion 60B. The lid body 60 is fixed by inserting the protrusion of the fixing jig 100 into the recess.

[0118] <2-8> In the above embodiment, the cover 60 may be formed with at least one of a protrusion protruding from the first surface 61 and a recess recessed from the first surface 61 toward the second surface 62. The electrode body 20 is fixed by at least one of the protrusion and the recess formed on the first surface 61. Furthermore, the shape of the electrode body 20 is maintained by at least one of the protrusion and the recess formed on the first surface 61.

[0119] <2-9> In the above embodiment, the exterior film 50 of the electricity storage device 10 may protrude outward in the FB direction beyond the lid body 60. The portion of the exterior film 50 protruding beyond the lid body 60 may be folded like a Gabeltop pouch or a brick pouch. [Explanation of symbols]

[0120] 10: Energy storage device 20: Electrode body 30: Electrode terminal 40: Exterior body 40A: Opening 50: Exterior film 60, 260, 360, 460: Lid 60B, 360B, 460B: Protrusion 260X: Through hole 261:Thick part 460X:Fracture 61: 1st page 62:Second side 100: Fixture 110, 510: Lid fixing part 200: Transport jig 211: Plate 211A: Handle 212: Plate 213:Connection part 700: Belt-shaped member 910: Elastic body 920: Elastic body

Claims

1. An electrode body; an exterior body that seals the electrode body, The exterior body is an exterior film that wraps the electrode body so that an opening is formed; a lid body that is placed on the opening, The lid body is The main body and a protrusion protruding from the body, The body includes: a first surface facing the electrode body; a second surface opposite the first surface; a hole; The protrusion is configured to be insertable into the hole so as to protrude from the second surface; and A fixing jig for transporting an intermediate body including the electrode body and the lid body, the fixing jig being configured to be attached to fix the position of the lid body relative to the electrode body. Energy storage device.

2. An electrode body; an exterior body that seals the electrode body, The exterior body is an exterior film that wraps the electrode body so that an opening is formed; a lid body that is placed on the opening, The lid body is a first surface facing the electrode body; a second surface opposite the first surface; a protrusion protruding from the second surface; The protrusion has a break, and A fixing jig for transporting an intermediate body including the electrode body and the lid body, the fixing jig being configured to be attached to fix the position of the lid body relative to the electrode body. Energy storage device.

3. A lid body used in the electricity storage device according to claim 1 or 2, the first surface; the second surface opposite the first surface; a sealing surface connecting the first surface and the second surface; the protruding portion protruding from the second surface, The sealing surface has a width that allows it to be joined to the exterior film. Lid body.

4. An electrode body; a packaging body that seals the electrode body, The exterior body is an exterior film that wraps the electrode body so that an opening is formed; a lid that closes the opening, The lid body is The main body and a protrusion protruding from the body, The body includes: a first surface facing the electrode body; a second surface opposite the first surface; a hole; The protrusion is a projection formed on the second surface and configured to be insertable into the hole; The method for manufacturing the electricity storage device includes: a fixing step of fixing a fixing jig to the protrusion of the lid body arranged on the side of the electrode body to fix the position of the lid body relative to the electrode body; a transporting step, which is carried out after the fixing step, of transporting an intermediate body including the electrode body and the lid body in a state in which the fixing jig is fixed to the lid body. A method for manufacturing an electricity storage device.

5. An electrode body; an exterior body that seals the electrode body, The exterior body is an exterior film that wraps the electrode body so that an opening is formed; a lid that closes the opening, The lid body is a first surface facing the electrode body; a second surface opposite the first surface; a protrusion protruding from the second surface; the protrusion has a break portion, The method for manufacturing the electricity storage device includes: a fixing step of fixing a fixing jig to the protrusion of the lid body arranged on the side of the electrode body to fix the position of the lid body relative to the electrode body; a transporting step, which is carried out after the fixing step, of transporting an intermediate body including the electrode body and the lid body in a state in which the fixing jig is fixed to the lid body. A method for manufacturing an electricity storage device.

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