Lid, lid unit, electricity storage device, method for manufacturing lid unit, and method for manufacturing electricity storage device

Abstract

To provide a lid body that allows an electrode terminal to be suitably disposed at a desired position, a lid body unit and a power storage device including this lid body, and a manufacturing method for the lid body unit and a manufacturing method for the power storage device.SOLUTION: A lid body is used for a power storage device. The power storage device includes an electrode body, an electrode terminal to be electrically connected to the electrode body, and a package film that is wound around the electrode body so as to have an opening part. The lid body is disposed at the opening part and includes a first part and a second part to have the electrode terminal held therebetween so that electric power can be input and output through the electrode terminal.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Patent Document 1 discloses an all-solid-state battery as an example of an electricity storage device. This all-solid-state battery includes an electrode body, an electrode terminal, and an exterior body that seals the electrode body. The exterior body includes an exterior film that is wrapped around the electrode body to have an opening, and a lid body that is placed in the opening. One end of the electrode terminal is electrically connected to the electrode body. The other end of the electrode terminal is exposed to the outside of the lid body. The electrode terminal penetrates the lid body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-153504 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described power storage device, one possible method for penetrating the electrode terminal into the lid is, for example, insert molding the lid onto the electrode terminal placed in a mold. However, because the electrode terminal is small compared to the lid, it is difficult to accurately position it at a predetermined position in the mold. Furthermore, because the electrode terminal is lightweight, there is a risk that the electrode terminal will be misaligned relative to the mold when the mold is filled with resin. This makes it difficult to position the electrode terminal at a desired position relative to the lid.

[0005] The present invention aims to provide a lid that allows electrode terminals to be suitably arranged at desired positions, a lid unit including the lid, an electricity storage device, a method for manufacturing the lid unit, and a method for manufacturing an electricity storage device. [Means for solving the problem]

[0006] A lid body according to a first aspect of the present invention is a lid body used in an electricity storage device, the electricity storage device including an electrode body, an electrode terminal electrically connected to the electrode body, and an exterior film wrapped around the electrode body so as to have an opening, and the lid body includes a first part and a second part that are placed in the opening and sandwich the electrode terminal so as to allow input and output of power via the electrode terminal.

[0007] A lid body according to a second aspect of the present invention is a lid body used in an electricity storage device, the electricity storage device including an electrode body, an electrode terminal electrically connected to the electrode body, and an exterior film wrapped around the electrode body so as to have an opening, the lid body being placed in the opening, and the lid body and the electrode terminal being joined by at least one selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive.

[0008] A lid according to a third aspect of the present invention is the lid according to the second aspect, and has a thick portion joined to the exterior film, and a thin portion connected to the thick portion and joined to the electrode terminal.

[0009] A lid body according to a fourth aspect of the present invention is a lid body used in an electricity storage device, the electricity storage device including an electrode body, an electrode terminal electrically connected to the electrode body, and an exterior film wrapped around the electrode body so as to have an opening, the lid body having a thick portion disposed in the opening and joined to the exterior film, and a thin portion connected to the thick portion and joined to the electrode terminal.

[0010] A lid body according to a fifth aspect of the present invention is a lid body according to any one of the second to fourth aspects, wherein the lid body includes a first part and a second part that sandwich the electrode terminals so that power can be input and output via the electrode terminals.

[0011] A lid according to a sixth aspect of the present invention is the lid according to the first or fifth aspect, wherein at least one of the first part and the second part has a recess for accommodating the electrode terminal.

[0012] A lid according to a seventh aspect of the present invention is the lid according to the first, fifth or sixth aspect, wherein the first part and the second part have positioning portions for sandwiching the electrode terminals.

[0013] A lid body according to an eighth aspect of the present invention is the lid body according to the seventh aspect, wherein the positioning portion includes a convex portion formed on one of the first part and the second part, and a concave portion formed on the other of the first part and the second part, into which the convex portion is inserted.

[0014] A lid body according to a ninth aspect of the present invention is a lid body according to the first aspect or any one of the fifth to eighth aspects, further comprising a connecting portion connecting the first part and the second part, and one of the first part and the second part is configured to be openable and closable relative to the other via the connecting portion.

[0015] A lid body according to a tenth aspect of the present invention is a lid body according to the first aspect or any one of the fifth to ninth aspects, further comprising a bonding body that is disposed between the electrode terminal and at least one of the first part and the second part and bonds to metal and resin.

[0016] A lid according to an eleventh aspect of the present invention is the lid according to the tenth aspect, wherein the bonded body includes at least one of a film, a resin molded body, and a membrane.

[0017] A lid according to a twelfth aspect of the present invention is the lid according to the first aspect or any one of the fifth to eleventh aspects, wherein the first part and the second part have exposed surfaces exposed to the outside of the electricity storage device, and a barrier film is bonded to at least a part of the exposed surfaces, and the barrier film has at least one of gas barrier properties and water vapor barrier properties.

[0018] A lid body according to a thirteenth aspect of the present invention is a lid body according to the first aspect, wherein at least one of the first part and the second part has a thick portion joined to the exterior film, and a thin portion connected to the thick portion and joined to the electrode terminal.

[0019] A lid body according to a fourteenth aspect of the present invention is the lid body according to the first aspect, wherein at least one of the first part and the second part and the electrode terminal are joined by at least one selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive.

[0020] A lid unit according to a fifteenth aspect of the present invention includes the lid according to the first aspect or any one of the fifth to fourteenth aspects, and the electrode terminal sandwiched between the first part and the second part.

[0021] A lid unit according to a sixteenth aspect of the present invention includes the lid according to any one of the second to fifth aspects, and the electrode terminal joined to the lid.

[0022] An electricity storage device according to a seventeenth aspect of the present invention includes the lid according to any one of the first to fourteenth aspects.

[0023] A method for manufacturing a lid body unit according to an 18th aspect of the present invention is a method for manufacturing a lid body unit according to the 15th aspect, and includes a step of sandwiching the electrode terminal between the first part and the second part so that power can be input and output via the electrode terminal, and a step of joining the first part and the second part to the electrode terminal.

[0024] A method for manufacturing a lid unit according to a nineteenth aspect of the present invention is the method for manufacturing a lid unit according to the sixteenth aspect, and includes the step of joining the lid and the electrode terminal.

[0025] A twentieth aspect of the present invention relates to a method for manufacturing an electricity storage device including an electrode body, an electrode terminal electrically connected to the electrode body, an exterior film wrapped around the electrode body so as to have an opening, and a lid body placed in the opening, wherein the lid body includes a first part and a second part, and the method for manufacturing the electricity storage device includes a step of sandwiching the electrode terminal between the first part and the second part so that power can be input and output via the electrode terminal, and a step of joining the first part and the second part to the electrode terminal.

[0026] A twenty-first aspect of the present invention relates to a method for manufacturing an electricity storage device including an electrode body, an electrode terminal electrically connected to the electrode body, an exterior film wrapped around the electrode body so as to have an opening, and a lid body placed in the opening, and the method includes a step of joining the lid body and the electrode terminal by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive.

[0027] A twenty-second aspect of the present invention relates to a method for manufacturing an electricity storage device including an electrode body, an electrode terminal electrically connected to the electrode body, an exterior film wrapped around the electrode body so as to have an opening, and a lid body placed in the opening, wherein the lid body has a thick portion joined to the exterior film and a thin portion connected to the thick portion and joined to the electrode terminal, and the method includes a step of joining the thin portion to the electrode terminal. [Effects of the Invention]

[0028] According to the lid, lid unit, electricity storage device, method for manufacturing a lid unit, and method for manufacturing an electricity storage device of the present invention, electrode terminals can be suitably arranged at desired positions. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view of an electricity accumulation device according to a first embodiment. [Figure 2]2 is a cross-sectional view showing the layer structure of an exterior film included in the electricity storage device of FIG. 1. [Figure 3] 2 is a front view of a lid and electrode terminals included in the electricity storage device of FIG. 1. FIG. [Figure 4] FIG. 4 is a side view of the lid and electrode terminal of FIG. 3. [Figure 5] 3 is a flowchart showing an example of a method for manufacturing the electricity storage device of FIG. [Figure 6] 10 is a flowchart showing another example of a method for manufacturing the electricity storage device of FIG. [Figure 7] FIG. 10 is a side view of a lid provided in the electricity accumulation device of the second embodiment. [Figure 8] FIG. 11 is an exploded front view of a lid provided in an electricity storage device according to a third embodiment. [Figure 9] FIG. 11 is a front view of an electricity accumulation device according to a fourth embodiment, showing a state in which a second part of the lid body is open relative to a first part. [Figure 10] FIG. 11 is an exploded front view of a lid provided in an electricity storage device according to a fifth embodiment. [Figure 11] FIG. 13 is an exploded front view of a lid provided in an electricity storage device according to a sixth embodiment. [Figure 12] FIG. 13 is a front view of a lid provided in an electricity accumulation device according to a seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0030] 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.

[0031] [1. First embodiment] <1-1. Configuration of the power storage device> Fig. 1 is a plan view schematically showing an electricity storage device 10 of a first embodiment. 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. 1. Fig. 3 is a front view of a lid body 60 and an electrode terminal 30 included in the electricity storage device 10 of Fig. 1. Fig. 4 is a side view of the lid body 60 and the electrode terminal 30 of Fig. 3. In Fig. 1, 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 UDLRFB are common to the subsequent figures.

[0032] The electricity storage device 10 includes an electrode body 20, an electrode terminal 30, and an exterior body 40. The electrode body 20 includes, for example, electrodes (positive and negative electrodes) constituting an electricity storage member such as a lithium ion battery, a capacitor, or an all-solid-state battery, as well as a separator. In this embodiment, the shape of the electrode body 20 is a substantially rectangular parallelepiped. Note that the term "substantially rectangular parallelepiped" includes not only a perfect rectangular parallelepiped, but also a solid that can be regarded as a rectangular parallelepiped by, for example, modifying the shape of a portion of its outer surface. The shape of the electrode body 20 may be, for example, a cylinder or a polygonal prism.

[0033] 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 not protrude from the exterior body 40 as long as it is capable of inputting and outputting electric power to and from the electrode body 20.

[0034] 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.

[0035] The exterior body 40 seals the electrode body 20. The exterior body 40 includes an exterior film 50 and a lid body 60. The exterior film 50 is wrapped around the electrode body 20 so as to have an opening 40A, and the lid body 60 is disposed on the side of the electrode body 20 so as to close the opening 40A.

[0036] An adhesive film 31 (see FIG. 3 ) is preferably bonded to the electrode terminal 30 from the viewpoint of favorable adhesion to the lid 60. The adhesive film 31 can be any film that can bond the metal electrode terminal 30 and the resin lid 60. The adhesive film 31 can be, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. The adhesive film 31 can be a single-layer film or a film of two or more layers. In this embodiment, the adhesive film 31 is bonded to substantially the entire portion of the electrode terminal 30 that is covered by the lid 60. Hereinafter, the thickness of the electrode terminal 30, including the adhesive film 31, when the adhesive film 31 is bonded to the electrode terminal 30 may be referred to as the overall thickness of the electrode terminal 30.

[0037] 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, leading to 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 thereby improve the volumetric energy density of the electricity storage device 10, it is preferable that the exterior film 50 be wrapped so as to come into contact with the outer surface of the electrode assembly 20. Furthermore, when the electricity storage device 10 is an all-solid-state battery, it is necessary to apply high pressure uniformly from the outer surface of the battery to exert battery performance, and therefore it is necessary to eliminate the space between the electrode body 20 and the exterior film 50. Therefore, it is preferable that the exterior film 50 is wrapped around the electrode body 20 so as to contact the outer surface of the electrode body 20.

[0038] 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, and for example, it may not include the barrier layer 52. In other words, the exterior film 50 only needs to be made of a flexible and easily bendable material, and may be made of, for example, a resin film. Note that the exterior film 50 is preferably heat-sealable.

[0039] 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. From the viewpoint of film strength, the thickness of the base layer 51 is preferably, for example, 5 to 300 μm, and more preferably 20 to 150 μm.

[0040] The barrier layer 52 is bonded to the base layer 51 via, for example, an adhesive layer 54. The barrier layer 52 included in the exterior film 50 is made of, for example, aluminum foil from the standpoints of processability (e.g., moisture resistance and ductility) and cost. The aluminum foil preferably contains iron from the standpoints of packaging suitability and pinhole resistance when packaging the electrode body 20. The iron content in the aluminum foil is preferably 0.5 to 5.0 mass %, more preferably 0.7 to 2.0 mass %. An iron content of 0.5 mass % or more provides the exterior film 50 with packaging suitability, excellent pinhole resistance, and ductility. Furthermore, an iron content of 5.0 mass % or less provides the exterior film 50 with excellent flexibility. The barrier layer 52 may include a metal foil, a vapor-deposited film, or a resin layer having barrier properties. Examples of metal foil include aluminum alloy, stainless steel, titanium steel, and steel plate.

[0041] From the viewpoints of barrier properties, pinhole resistance, and packaging suitability, the thickness of the barrier layer 52 is preferably, for example, 15 to 100 μm, and more preferably 30 to 80 μm. When the thickness of the barrier layer 52 is 15 μm or more, the exterior film 50 is less likely to break even when stress is applied during packaging processing. When the thickness of the barrier layer 52 is 100 μm or less, an increase in the mass of the exterior film 50 can be reduced, and a decrease in the weight energy density of the electricity storage device 10 can be suppressed.

[0042] 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.

[0043] The corrosion-resistant coating prevents delamination between the barrier layer 52 (e.g., aluminum alloy foil) and the base layer 51 during molding of the exterior film 50, 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 molding.

[0044] 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, cyclic polyolefin 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In the present embodiment, the first sealed portion 70 is formed by heat-sealing the opposing surfaces (heat-fusible resin layers 53) of the exterior film 50, which is wrapped around the electrode body 20 so as to have the opening 40A. In the present embodiment, the first sealed portion 70 extends in the longitudinal direction of the exterior body 40. The position on the exterior body 40 where the first sealed portion 70 is formed can be selected arbitrarily. In the present embodiment, the base 70X of the first sealed portion 70 is located on the side 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 is folded, for example, toward the second surface 42 of the exterior body 40. The first sealing portion 70 may protrude outward beyond the electrode body 20 in a plan view, or may be folded toward the first surface 41.

[0050] The lid 60 has, for example, a rectangular parallelepiped shape as a whole and is made of a resin material. The lid 60 may be formed by, for example, cold-forming the exterior film 50. Examples of materials for the lid 60 include polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins, fluorine-based 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. From the viewpoint of optimal heat-sealing the lid 60 and the exterior film 50, it is preferable that the material for the lid 60 and the material for the heat-sealable resin layer 53 of the exterior film 50 are primarily the same. In this embodiment, the material for the lid 60 and the material for the heat-sealable resin layer 53 are primarily made of, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, or an acid-modified polyolefin resin obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. The main material refers to a material that accounts for 50% or more of the materials contained in a component, for example.

[0051] In this embodiment, the lid 60 has a first part 61 and a second part 62, which are separated from each other, in order to suitably position the electrode terminal 30 at a desired position. The lid 60 may be configured to include three or more parts. The first part 61 and the second part 62 are preferably joined to the electrode terminal 30 by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive, with an adhesive film 31 interposed therebetween as needed. Because the electrode terminal 30 and the lid 60 are firmly joined, the electrode terminal 30 can be suitably held by the lid 60. When the adhesive film 31 is not joined to the electrode terminal 30, the first part 61 and the second part 62 are preferably joined to the electrode terminal 30 by an adhesive. Examples of the adhesive include hot melt adhesives and adhesives used in dry lamination.

[0052] The shape of the first part 61 and the shape of the second part 62 can be selected arbitrarily as long as they are shapes that can sandwich the electrode terminal 30 so that power can be input and output via the electrode terminal 30. It is preferable that the first part 61 and the second part 62 have substantially the same shape. In this embodiment, the first part 61 and the second part 62 have substantially the same shape.

[0053] The first part 61 is disposed below the second part 62. The first part 61 has a part joint 61A that is joined to the second part 62, and a recess 61B that is recessed from the part joint 61A. The shape of the recess 61B in a plan view can be selected arbitrarily as long as it can accommodate a portion of the electrode terminal 30. In this embodiment, the shape of the recess 61B in a plan view is rectangular. The recess 61B has side surfaces 61BX and a bottom surface 61BY. The adhesive film 31 that is joined to the electrode terminal 30 is joined to the side surfaces 61BX and the bottom surface 61BY. Because the first part 61 has the recess 61B, the electrode terminal 30 is less likely to shift position relative to the first part 61. Furthermore, the electrode terminal 30 can be easily positioned relative to the first part 61.

[0054] The second part 62 has a part joint portion 62A that is joined to the first part 61, and a recessed portion 62B that is recessed from the part joint portion 62A. The shape of the recessed portion 62B in a plan view can be selected arbitrarily as long as it can accommodate a portion of the electrode terminal 30 to which the adhesive film 31 is joined. In this embodiment, the shape of the recessed portion 62B in a plan view is rectangular. The recessed portion 62B has side surfaces 62BX and a bottom surface 62BY. The adhesive film 31 that is joined to the electrode terminal 30 is joined to the side surfaces 62BX and the bottom surface 62BY. Because the second part 62 has the recessed portion 62B, the electrode terminal 30 is less likely to shift position relative to the second part 62. Furthermore, the electrode terminal 30 can be easily positioned relative to the second part 62.

[0055] The depth of the recess 61B (height of the side surface 61BX) and the depth of the recess 62B (height of the side surface 62BX) can be selected arbitrarily as long as they are deep enough to accommodate the entire electrode terminal 30 with the adhesive film 31 bonded thereto. In this embodiment, the depth of the recess 61B is approximately half the overall thickness of the electrode terminal 30. The depth of the recess 62B is approximately half the overall thickness of the electrode terminal 30 with the adhesive film 31 bonded thereto. In other words, the sum of the depths of the recess 61B and the recess 62B is substantially equal to the overall thickness of the electrode terminal 30.

[0056] The first part 61 has a sealing surface 61X that is sealed to the exterior film 50 and an exposed surface 61Y that is exposed to the outside of the electricity storage device 10. The second part 62 has a sealing surface 62X that is sealed to the exterior film 50 and an exposed surface 62Y that is exposed to the outside of the electricity storage device 10. The sealing surfaces 61X and 62X form side surfaces of the lid body 60. The exposed surfaces 61Y and 62Y are surfaces of the lid body 60 opposite to the surface that faces the electrode body 20. A barrier film 100 having at least one of gas barrier properties and water vapor barrier properties is preferably bonded to at least a portion of the exposed surfaces 61Y and 62Y. In this embodiment, the barrier film 100 is bonded to substantially the entire exposed surfaces 61Y and 62Y. For example, the specifications of the exterior film 50 can be applied to the specifications of the barrier film 100. When the barrier film 100 has a heat-sealable resin layer, the heat-sealable resin layer of the barrier film 100 is bonded to the exposed surfaces 61Y, 62Y of the lid 60. In another example, the barrier film 100 may be a vapor-deposited film in which a thin film of a metal such as aluminum, silicon oxide, or alumina is formed by vacuum deposition on the surface of a plastic film such as polyester, polypropylene, or nylon. When the barrier film 100 does not have a heat-sealable resin layer, the barrier film 100 and the exposed surfaces 61Y, 62Y of the lid 60 are bonded together, for example, with an adhesive. The outer periphery of the barrier film 100 does not need to coincide with the outer periphery of the exposed surfaces 61Y, 62Y. For example, a barrier film 100 larger than the outer periphery of the exposed surfaces 61Y, 62Y may be prepared, and the portions of the barrier film 100 that protrude beyond the outer periphery of the exposed surfaces 61Y, 62Y may be folded and bonded to the sealing surfaces 61X, 62X. The portions of the barrier film 100 joined to the sealing surfaces 61X, 62X are joined to the innermost layer of the exterior film 50. In another example, the portions of the barrier film 100 that protrude from the outer contours of the exposed surfaces 61Y, 62Y may be folded and joined to the outermost layer of the exterior film 50, for example, with an adhesive or the like.

[0057] If the electricity storage device 10 is a lithium ion battery, gases such as volatile organic solvents, carbon monoxide, carbon dioxide, methane, ethane, hydrogen, and hydrogen fluoride may be generated due to the evaporation of the organic solvent serving as the electrolyte and the decomposition of the electrolyte solution. If the electricity storage device 10 is a capacitor, gases may be generated due to chemical reactions in the capacitor. If the electricity storage device 10 is an all-solid-state battery, the electrode body 20 may include a solid electrolyte that can generate gas. For example, if the solid electrolyte is a sulfide-based electrolyte, hydrogen sulfide gas may be generated. If the barrier film 100 has gas barrier properties, leakage of these gases to the outside of the exterior body 40 is suppressed. If the barrier film 100 has water vapor barrier properties, moisture in the external space of the electricity storage device 10 is suppressed from penetrating into the interior of the exterior body 40.

[0058] In this embodiment, the second sealed portion 80 is formed by heat-sealing the heat-sealable resin layer 53 of the exterior film 50 to the sealing surfaces 61X, 62X of the lid 60. Hereinafter, the seal strength between the heat-sealable resin layer 53 of the exterior film 50 and the sealing surfaces 61X, 62X of the lid 60 may be referred to as the seal strength of the second sealed portion 80. Note that the seal strength of the second sealed portion 80 refers to the seal strength between the heat-sealable resin layer 53 and the lid 60 at the long side portions of the sealing surfaces 61X, 62X, i.e., the sealing surfaces 61X, 62X extending in the LR (width) direction in FIG. 1 . The seal strength of the second sealed portion 80 is measured by pulling the exterior film 50 relative to the lid 60 in the UD (vertical) direction in FIG. 1 and based on the distance of the second sealed portion 80 in the FB (depth) direction. In the present embodiment, when the lid body 60 is divided into multiple parts including long and short sides, the sealing strength of the second sealing portion 80 is the sealing strength of the long side portions of the sealing surfaces 61X, 62X of the multiple parts.

[0059] 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 150 N / 15 mm or less. A preferred range for the seal strength of the second sealing portion 80 is 40N / 15mm to 150N / 15mm, 50N / 15mm to 150N / 15mm, 60N / 15mm to 150N / 15mm, 70N / 15mm to 150N / 15mm, or 85N / 15mm to 150N / 15mm.

[0060] When the lid body 60 is plate-shaped, it is preferable that the lid body 60 have a certain thickness so that deformation of the exterior body 40 is suppressed even when the electricity storage device 10 is placed on top of it. From another perspective, when the lid body 60 is plate-shaped, it is preferable that the sealing surfaces 61X, 62X of the lid body 60 have a certain thickness so that the sealing surfaces 61X, 62X of the lid body 60 can be suitably heat-sealed to the exterior film 50 when forming the second sealing portion 80. The minimum thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3 mm, and even more preferably 4 mm. The maximum thickness of the lid body 60 is, for example, 10 mm, more preferably 8.0 mm, and even more preferably 7.0 mm. The maximum thickness of the lid body 60 may be 10 mm or more. The preferred ranges for the thickness of the material constituting the lid body 60 are 1.0 mm to 10 mm, 1.0 mm to 8.0 mm, 1.0 mm to 7.0 mm, 3.0 mm to 10 mm, 3.0 mm to 8.0 mm, 3.0 mm to 7.0 mm, 4.0 mm to 10 mm, 4.0 mm to 8.0 mm, and 4.0 mm to 7.0 mm. In this embodiment, when the lid body 60 is described as being plate-shaped, films defined by the JIS (Japanese Industrial Standards) "Packaging Terminology" standard are not included as materials constituting the lid body 60. The thickness of the lid body 60 may vary depending on the region of the lid body 60. When the thickness of the lid body 60 varies depending on the region, the thickness of the lid body 60 is the thickness of the thickest portion.

[0061] <1-2. Method for manufacturing electricity storage devices> 5 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, and an eighth step. The first step to the eighth step are performed, for example, by a manufacturing apparatus for the electricity storage device 10. Note that in this embodiment, the first step to the eighth step are simply names of the steps defined for convenience, and do not refer to the order of the steps.

[0062] In the first process of step S11, the manufacturing device manufactures a first part 61 and a second part 62.

[0063] The second process of step S12 is performed after the first process. In the second process, the manufacturing device bonds the adhesive film 31 to the electrode terminal 30. Note that the second process may be performed before the first process.

[0064] The third step of step S13 is performed after the first step or the second step. In the third step, the manufacturing apparatus sandwiches the electrode terminal 30 between the first part 61 and the second part 62. The manufacturing apparatus joins the first part 61 and the second part 62 to the electrode terminal 30 by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and adhesive. Completion of the third step completes an object in which the electrode terminal 30 and the lid 60 are joined together (hereinafter referred to as a "lid unit 90"). The first to third steps correspond to a method for manufacturing the lid unit 90.

[0065] The fourth step of step S14 is performed after the third step. In the fourth step, the manufacturing apparatus places the lid unit 90 on both ends of the electrode body 20 and electrically connects the electrode terminals 30 and the electrodes of the electrode body 20.

[0066] The fifth step of step S15 is carried out after the fourth step. In the fifth step, the manufacturing apparatus wraps the exterior film 50 around the electrode body 20 and the lid body unit 90.

[0067] The sixth step of step S16 is performed after the fifth step. In the fifth step, the manufacturing apparatus heat-seals the opposing heat-sealable resin layers 53 of the exterior film 50 to form a first sealed portion 70 (hereinafter referred to as a "temporary first sealed portion") having a partial unsealed portion. The unsealed portion can be formed, for example, by using a sealing bar shaped so that a portion of the sealing bar does not come into contact with the exterior film 50. In another example, the unsealed portion can be formed by interposing a fluororesin film or the like between the opposing surfaces (heat-sealable resin layers 53) of the exterior film 50. By forming the temporary first sealed portion before the second sealed portion 80, the electrode body 20 can be held by the exterior film 50, making it less likely that the electrode body 20 will shift position relative to the exterior film 50. This prevents wrinkles from occurring when the second sealed portion 80 is formed.

[0068] The seventh step of step S17 is performed after the sixth step. In the seventh step, the manufacturing apparatus heat-seals the exterior film 50 and the sealing surfaces 61X and 62X of the lid 60 to form the second sealed portion 80.

[0069] The eighth step of step S18 is performed after the seventh step. In the eighth step, the manufacturing equipment injects an electrolyte solution from the unsealed portion of the temporary first sealed portion, evacuates the exterior film 50, and then heat-seals the unsealed portion to form the first sealed portion 70. Note that if the electricity storage device 10 is an all-solid-state battery, the step of injecting the electrolyte solution in the eighth step is omitted.

[0070] Fig. 6 is a flowchart showing another example of a method for manufacturing the electricity storage device 10. The manufacturing method shown in Fig. 6 is the same as the manufacturing method shown in Fig. 5 except that the ninth step of step S21 is performed instead of the third step of step S13 shown in Fig. 5, and the tenth step of step S22 is performed instead of the fourth step of step S14.

[0071] 6, in a ninth step of step S21, which is performed after the first step of step S11 or the second step of step S12, the manufacturing equipment electrically connects the electrode terminal 30 to the electrodes of the electrode assembly 20. In a tenth step of step S22, which is performed after the ninth step, the manufacturing equipment sandwiches the electrode terminal 30 between a first part 61 and a second part 62, and joins the first part 61 and the second part 62 to the electrode terminal 30 by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive. In the example shown in FIG. 6, in the tenth step, the lid 60 may cover, for example, the portion where the current collecting foil of the electrode assembly 20 and the electrode terminal 30 are connected.

[0072] <1-3. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10, the electrode terminal 30 is sandwiched between the separated first part 61 and second part 62, thereby forming a state in which the electrode terminal 30 is held by the lid 60. This allows the electrode terminal 30 to be suitably arranged in a desired position.

[0073] Furthermore, the electricity storage device described in Patent Document 1 (JP 2019-153504 A) does not consider a method for fixing the lid and the electrode terminals, which may result in misalignment of the electrode terminals relative to the lid.

[0074] According to the electricity storage device of this embodiment, the electrode terminals 30 are joined by at least one selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive, optionally via an adhesive film 31. Since the electrode terminals 30 and the lid 60 are firmly joined, the electrode terminals 30 can be suitably held by the lid 60.

[0075] [2. Second Embodiment] The electricity storage device 10 of the second embodiment differs from the first embodiment in that it includes a lid body 260, but other configurations are similar to those of the first embodiment. The following describes the lid body 260 included in the electricity storage device 10 of the second embodiment, focusing on the differences from the lid body 60 of the first embodiment.

[0076] <2-1. Lid structure> FIG. 7 is a side view of the lid 260. The lid 260 has a first part 261 and a second part 262. The first part 261 has a thick portion 261X and a thin portion 261Y. The thick portion 261X has a shape similar to that of the first part 61 of the first embodiment and has a seal surface 61X that is joined to the exterior film 50. The thin portion 261Y is connected to the thick portion 261X and is joined to the electrode terminal 30 via the adhesive film 31. The thickness HB of the thin portion 261Y is thinner than the thickness HA of the thick portion 261X. The recess 61B is formed in the thick portion 261X and the thin portion 261Y. In this embodiment, the thin portion 261Y is formed closer to the electrode body 20 than the thick portion 261X. The thin portion 261Y may be formed at a position farther from the electrode body 20 than the thick portion 261X, in other words, on the outside.

[0077] The second part 262 has a thick portion 262X and a thin portion 262Y. The thick portion 262X has the same shape as the second part 62 of the second embodiment and has a seal surface 62X that is joined to the exterior film 50. The thin portion 262Y is connected to the thick portion 262X and is joined to the electrode terminal 30 via the adhesive film 31. The thickness HD of the thin portion 262Y is thinner than the thickness HC of the thick portion 262X. The recesses 62B are formed in the thick portion 262X and the thin portion 262Y. In this embodiment, the thin portion 262Y is formed closer to the electrode body 20 than the thick portion 262X. The thin portion 262Y may be formed further from the electrode body 20 than the thick portion 262X, in other words, on the outside.

[0078] <2-2. Actions and Effects of Electricity Storage Devices> According to the second embodiment of the energy storage device 10, the lid body 260 has thin portions 261Y, 262Y, and therefore the electrode terminals 30 can be firmly joined to the thin portions 261Y, 262Y by at least one method selected from ultrasonic sealing, high frequency sealing, heat sealing, and hot plate welding, for example.

[0079] 3. Third Embodiment The electricity storage device 10 of the third embodiment differs from the first embodiment in that it includes a lid body 360, but other configurations are similar to those of the first embodiment. The following describes the lid body 360 included in the electricity storage device 10 of the third embodiment, focusing on the differences from the lid body 60 of the first embodiment.

[0080] <3-1. Lid structure> FIG. 8 is an exploded front view of the lid 360. The lid 360 has a first part 361 and a second part 362. The first part 361 and the second part 362 have a positioning portion 370 for sandwiching the electrode terminal 30. The positioning portion 370 includes a protrusion 371 formed on one of the first part 361 and the second part 362, and a recess 372 formed on the other of the first part 361 and the second part 362, into which the protrusion 371 is inserted. In this embodiment, the protrusion 371 is formed at the part joint portion 61A of the first part 361. In this embodiment, the recess 372 is formed at the part joint portion 62A of the second part 362. The shape of the protrusion 371 can be selected arbitrarily. In this embodiment, the protrusion 371 is a hemisphere. The shape of the protrusion 371 may be a prism, a pyramid, a cylinder, or a cone. The shape of the recess 372 can be selected arbitrarily as long as the shape allows the projection 371 to be inserted therein.

[0081] <3-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the third embodiment, the lid body 360 has the positioning portion 370, so that the third step of step S13 shown in FIG. 5 and the tenth step of step S22 shown in FIG. 6 can be easily performed.

[0082] [4. Fourth Embodiment] The electricity storage device 10 of the fourth embodiment differs from the first embodiment in that it includes a lid body 460, but other configurations are similar to those of the first embodiment. The following describes the lid body 460 included in the electricity storage device 10 of the fourth embodiment, focusing on the differences from the lid body 60 of the first embodiment.

[0083] <4-1. Lid structure> 9 is a front view of lid 460 in a state in which second part 462 is open relative to first part 461. Lid 460 has first part 461, second part 462, and a connecting portion 463 that connects first part 461 and second part 462. One of first part 461 and second part 462 is configured to be able to open and close relative to the other via connecting portion 463. Connecting portion 463 functions like a hinge. Connecting portion 463 connects part joint portion 61A of first part 461 and part joint portion 62A of second part 462.

[0084] <4-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the fourth embodiment, the lid 460 has a connecting portion 463, so the first part 461 and the second part 462 do not separate. This makes it easy to manage the lid 460. Furthermore, by closing one of the first part 461 and the second part 462 over the other, the electrode terminal 30 can be sandwiched between them. Because it is easy to position one of the first part 461 and the second part 462 relative to the other, the third step of step S13 shown in FIG. 5 and the tenth step of step S22 shown in FIG. 6 can be easily performed.

[0085] [5. Fifth Embodiment] The electricity storage device 10 of the fifth embodiment differs from the first embodiment in that it includes a lid body 560, but other configurations are similar to those of the first embodiment. The following describes the lid body 560 included in the electricity storage device 10 of the fifth embodiment, focusing on the differences from the lid body 60 of the first embodiment.

[0086] <5-1. Lid structure> FIG. 10 is an exploded front view of the lid 560. The lid 560 includes a first part 561, a second part 562, and a joint 563. The first part 561 has the same shape as the first part 61. The second part 562 has the same shape as the second part 62. The joint 563 joins the electrode terminal 30, which is made of metal, to the first part 561 and the second part 562, which are made of resin. In this embodiment, the joint 563 can be made of any conventionally known material as long as it can join the first part 561 and the second part 562 to the electrode terminal 30. The joint 563 is preferably a resin molded body made of, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by graft-modifying any of these polyolefin resins with an acid such as maleic anhydride. 10, it is preferable that bonding body 563 be bonded to the entire recess 61B of first part 561 and the entire recess 62B of second part 562. Bonded body 563 may be bonded only to bottom surface 61BY of recess 61B. Bonded body 563 may be bonded only to bottom surface 62BY of recess 62B.

[0087] <5-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the fifth embodiment, the lid body 560 has the bonding body 563, so there is no need to bond the adhesive film 31 to the electrode terminal 30. Since the second process of step S12 shown in Fig. 5 or 6 can be omitted, the electricity storage device 10 can be easily manufactured.

[0088] [6. Sixth Embodiment] The electricity storage device 10 of the sixth embodiment differs from the fifth embodiment in that it includes a lid body 660, but other configurations are similar to those of the fifth embodiment. The following describes the lid body 660 included in the electricity storage device 10 of the sixth embodiment, focusing on the differences from the lid body 560 of the fifth embodiment.

[0089] <6-1. Lid structure> FIG. 11 is an exploded front view of the lid 660. The lid 660 has a first part 661, a second part 662, and a bonding member 663. The bonding member 663 bonds the electrode terminal 30, which is made of metal, to the first part 661 and the second part 662, which are made of resin. In this embodiment, the bonding member 663 is, for example, the adhesive film 31 of the first embodiment. As shown in FIG. 11, the bonding member 663 is preferably bonded to the entire part bonding portion 61A and the entire recess 61B of the first part 661. As shown in FIG. 11, the bonding member 663 is preferably bonded to the entire part bonding portion 62A and the entire recess 62B of the second part 662. The bonding member 663 may be bonded only to the recess 61B, or may be bonded only to the bottom surface 61BY of the recess 61B. Bonding body 563 may be bonded only to recess 62B, or may be bonded only to bottom surface 62BY of recess 62B. Bonding body 663 may be a film. Examples of the film include a coating film that bonds electrode terminal 30 made of metal to first part 661 and second part 662 made of resin.

[0090] <6-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the sixth embodiment, the lid body 660 has the bonding body 663, so there is no need to bond the adhesive film 31 to the electrode terminal 30. Since the second process of step S12 shown in Fig. 5 or 6 can be omitted, the electricity storage device 10 can be easily manufactured.

[0091] [7. Seventh Embodiment] The electricity storage device 10 of the seventh embodiment differs from the sixth embodiment in that it includes a lid body 760, but other configurations are similar to those of the sixth embodiment. The following describes the lid body 760 included in the electricity storage device 10 of the seventh embodiment, focusing on the differences from the lid body 660 of the sixth embodiment.

[0092] <7-1. Lid structure> FIG. 12 is a front view of the lid 760 and the electrode terminal 30. The lid 760 has a first part 761, a second part 762, and a bonding member 763. The first part 761 has a shape obtained by omitting the recess 61B from the first part 661 (see FIG. 11), i.e., a rectangular parallelepiped. The second part 762 has a shape obtained by omitting the recess 62B from the second part 662 (see FIG. 11), i.e., a rectangular parallelepiped. The bonding member 763 is, for example, the adhesive film 31 of the first embodiment. The bonding member 763 is bonded to the upper surface of the first part 761 so as to cover the entire upper surface. In the example shown in FIG. 12, the bonding member 763 protrudes from both ends of the upper surface of the first part 761. The bonding member 763 is bonded to the lower surface of the second part 762 so as to cover the entire lower surface. 12, the bonding body 763 protrudes from both ends of the lower surface of the second part 762. If a small gap is formed between the first part 761 and the second part 762 at both ends of the electrode terminal 30, this gap is preferably filled with an adhesive 764 such as a hot melt. The gaps at both ends of the electrode terminal 30 may be filled by subjecting the first part 761 and the second part 762 to at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, and hot plate welding.

[0093] <7-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the seventh embodiment, the lid body 760 has the bonding body 763, so there is no need to bond the adhesive film 31 to the electrode terminal 30. Since the second process of step S12 shown in Fig. 5 or 6 can be omitted, the electricity storage device 10 can be easily manufactured.

[0094] <8. Variations> The above-described embodiments are examples of possible forms of the lid, lid unit, electricity storage device, method for manufacturing a lid unit, and method for manufacturing an electricity storage device according to the present invention, and are not intended to limit the forms. The lid, lid unit, electricity storage device, method for manufacturing a lid unit, and method for manufacturing an electricity storage device 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 each embodiment is replaced, modified, or omitted, or forms in which a new configuration is added to each embodiment. Some examples of modified forms of each embodiment are shown below. Note that the above-described embodiments and the following modified forms can be combined with each other as long as there is no technical contradiction.

[0095] <8-1> In the electricity storage device 10 of the first embodiment, the configuration of the lid body 60 can be modified as desired. For example, at least one of the recess 61B of the first part 61 and the recess 62B of the second part 62 of the lid body 60 may be omitted. When the recess 61B of the first part 61 or the recess 62B of the second part 62 is omitted, it is preferable that the depth of the recess 61B or the recess 62B be modified so that it is equal to or greater than the overall thickness of the electrode terminal 30. When the recess 61B of the first part 61 and the recess 62B of the second part 62 are omitted, minute gaps may be formed between the first part 61 and the second part 62 at both ends of the electrode terminal 30. These gaps are preferably filled with an adhesive such as hot melt. The gaps at both ends of the electrode terminal 30 may be filled by subjecting the first part 61 and the second part 62 to at least one of ultrasonic sealing, high-frequency sealing, heat sealing, and hot plate welding.

[0096] <8-2> In the electricity storage device 10 of the second embodiment, the configuration of the lid body 260 can be changed arbitrarily. For example, one of the thin portion 261Y and the thin portion 262Y of the lid body 260 may be omitted.

[0097] <8-3> In the electricity storage device 10 of the second embodiment, the first part 261 and the second part 262 of the lid 260 may be integrally formed. In other words, the lid 260 may be formed as a single part. According to this modification, holes penetrating the lid 260 are preferably formed instead of the recesses 61B and 62B. After the lid 260 is formed, the electrode terminals 30 may be inserted into the holes and joined to the lid 260 by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive. The lids 60, 360, 460, 560, 660, and 760 of the electricity storage devices 10 of the first, third, fourth, fifth, sixth, and seventh embodiments may also be formed as a single part.

[0098] <8-4> In the electricity storage device 10 of the third embodiment, the configuration of the lid 360 can be changed as desired. For example, the positioning portion 370 may be a pattern drawn on or attached to the first part 361 and the second part 362. Furthermore, the protrusion 371 may be formed in the part joint portion 62A of the second part 362, and the recess 372 may be formed in the part joint portion 61A of the first part 361.

[0099] <8-5> In the electricity storage device 10 of the first embodiment, the two electrode terminals 30 may protrude from one of the two lid bodies 60. In this modification, the portion of the exterior body 40 where the other lid body 60 is disposed can be sealed by a known method. For example, the portion where the other lid body 60 is disposed may be sealed with a known lid body formed from a single part, or the other lid body 60 may be omitted and the electrode body 20 may be sealed by folding the exterior film 50. This modification can be similarly applied to the second to seventh embodiments.

[0100] <8-6> In the power storage device 10 of the first embodiment, the exterior film 50 may be a laminate (laminate film) having heat-sealable resin layers 53 on both sides of the barrier layer 52. In this modification, the first sealing portion 70 may be formed by heat-sealing the heat-sealable resin layers 53 laminated on one side or the other side of the barrier layer 52 to each other, or by heat-sealing the heat-sealable resin layer 53 laminated on one side of the barrier layer 52 to the heat-sealable resin layer 53 laminated on the other side of the barrier layer 52. In this modification, the base 70X of the first sealing portion 70 is located on any surface of the exterior body 40. In this modification, the base 70X of the first sealing portion 70 is preferably located near the side 43 at the boundary between the first surface 41 and the second surface 42. In this modification, the heat-sealable resin layer 53 may be bonded to the barrier layer 52 via, for example, an adhesive layer 55. This modification can be similarly applied to the second to seventh embodiments.

[0101] <8-7> The lids 60, 360, 460, 560, 660, and 760 of the electricity storage devices 10 of the first, third, fourth, fifth, sixth, and seventh embodiments may also have thick and thin portions, similar to the lid 260 of the electricity storage device 10 of the second embodiment. When the lids 60, 260, 360, 460, 560, 660, and 760 have thick and thin portions, the means for joining the thin portions of the lid 60 or the like to the electrode terminals 30 can be selected arbitrarily. [Explanation of symbols]

[0102] 10: Energy storage device 20: Electrode body 30: Electrode terminal 40: Exterior body 40A: Opening 50: Exterior film 60: Lid 61: First part 61B: Recess 61Y: Exposed surface 62: Second part 62B: Recess 62Y: Exposed surface 90: Lid unit 100: Barrier film 260: Lid 261: First part 261X: Thick part 261Y: Thin section 262: Second part 262X: Thick part 262Y: Thin section 360: Lid 361: First part 362: Second part 370: Positioning section 371: Convex part 372: Recess 460: Lid 461: First part 462: Second part 463 :Connection part 560: Lid 561: First part 562: Second part 563 :zygote 660: Lid 661: First part 662: Second part 663 :zygote 760: Lid 761: First part 762: Second part 763 :zygote

Claims

1. A lid body used in an electricity storage device, The electricity storage device is An electrode body; an electrode terminal electrically connected to the electrode body; an exterior film wrapped around the electrode body so as to have an opening; The lid is disposed at the opening, The electrode terminal is connected to a thick portion that is joined to the exterior film, and a thin portion that is connected to the thick portion. Lid body.

2. The thin portion is formed at a position closer to the electrode body than the thick portion. The lid according to claim 1 .

3. The thin portion is formed at a position farther from the electrode body than the thick portion. The lid according to claim 1 .

4. A lid body according to any one of claims 1 to 3, the electrode terminal joined to the lid body. Lid unit.

5. An electricity storage device having a lid body described in any one of claims 1 to 3.

6. A method for manufacturing the lid body unit described in claim 1, and joining the lid and the electrode terminal. A method for manufacturing a lid unit.

7. A method for manufacturing an electricity storage device, comprising: The electricity storage device is An electrode body; an electrode terminal electrically connected to the electrode body; an exterior film wrapped around the electrode body so as to have an opening; a lid body disposed in the opening, the lid body has a thick portion joined to the exterior film and a thin portion connected to the thick portion and joined to the electrode terminal, The method for manufacturing the electricity storage device includes: and joining the thin portion and the electrode terminal. A method for manufacturing an electricity storage device.

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