Lid body, lid body unit, power storage device, manufacturing method for lid body unit, and manufacturing method for power 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 on 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] JP 2019-153504 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned power storage device, in order to penetrate the electrode terminal into the lid, for example, a method of insert molding the lid with respect to the electrode terminal arranged in a mold is considered. However, since the electrode terminal is small compared to the lid, it is difficult to arrange it accurately at a predetermined position in the mold. In addition, since the electrode terminal is lightweight, there is a risk that the position of the electrode terminal will be shifted relative to the mold when the mold is filled with resin. For this reason, it is difficult to arrange the electrode terminal at a desired position relative to the lid.

[0005] An object of the present invention is to provide a lid that enables electrode terminals to be suitably arranged at desired positions, a lid unit including this 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 for use 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 including a first part and a second part that are positioned in the opening and sandwich the electrode terminal so as to enable 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 for use 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 terminal so that power can be input and output via the electrode terminal.

[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 having 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 part 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 that bonds to a metal and a 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 body according to a twelfth aspect of the present invention is a lid body 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 portion 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 accumulation 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 as described in 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 body unit according to a nineteenth aspect of the present invention is the method for manufacturing a lid body unit as defined in the sixteenth aspect, and includes a step of joining the lid body and the electrode terminal.

[0025] A manufacturing method for an electricity storage device according to a twentieth aspect of the present invention is a manufacturing method for 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 cover body placed on the opening, wherein the cover body includes a first part and a second part, and the manufacturing method for 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 manufacturing method for an electricity storage device according to a 21st aspect of the present invention is a manufacturing method for 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 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, the lid body having a thick portion joined to the exterior film and a thin portion connected to the thick portion and joined to the electrode terminal, and includes a step of joining the thin portion to the electrode terminal. Effect 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 disposed at desired positions. [Brief description of the drawings]

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

[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 "not less than" or "not more than." 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 showing a schematic diagram of an electricity storage device 10 of a first embodiment. Fig. 2 is a cross-sectional view showing a 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 the arrow UD indicates the thickness direction of the electricity storage device 10, the direction of the arrow LR indicates the width direction of the electricity storage device 10, and the direction of the 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 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 body that can be regarded as a rectangular parallelepiped by modifying the shape of a portion of the outer surface, for example. 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, for example, 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. 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] From the viewpoint of suitable adhesion to the lid 60, it is preferable that an adhesive film 31 (see FIG. 3) is bonded to the electrode terminal 30. The adhesive film 31 can be selected arbitrarily as long as it is a film capable of bonding the electrode terminal 30 made of metal and the lid 60 made of resin. For example, the adhesive film 31 can be 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 or two or more layers of these films. In this embodiment, the adhesive film 31 is bonded to almost the entire part of the electrode terminal 30 that is covered by the lid 60. In the following, the thickness of the electrode terminal 30 including the adhesive film 31 in the electrode terminal 30 in a state in which the adhesive film 31 is bonded may be referred to as the entire thickness of the electrode terminal 30.

[0037] For example, there is a method of forming a storage portion (recess) for storing the electrode body 20 in the exterior film 50 through cold forming. However, it is not necessarily easy to form a deep storage portion by such a method. If an attempt is made to form a deep storage portion (recess) (for example, a forming depth of 15 mm) through cold forming, pinholes or cracks will occur in the exterior film 50, which is likely to lead to a decrease in battery performance. On the other hand, the exterior body 40 seals the electrode body 20 by wrapping the exterior film 50 around the electrode body 20, so that the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20. Note that in order to reduce the dead space between the electrode body 20 and the exterior film 50 so as to improve the volumetric energy density of the electricity storage device 10, it is preferable that the exterior film 50 is wrapped so as to contact the outer surface of the electrode body 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 be in contact with the outer surface of the electrode body 20.

[0038] 2, the exterior film 50 is, for example, a laminate (laminate film) having a base 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, the barrier layer 52 may not be included. That is, the exterior film 50 only needs to be made of a material that is flexible and easily bendable, and may be made of, for example, a resin film. Note that the exterior film 50 is preferably heat-sealable.

[0039] The base layer 51 included in the exterior film 50 is a layer for imparting heat resistance to the exterior film 50 and suppressing the occurrence of pinholes that may occur during processing or distribution. The base layer 51 is configured to include at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer. For example, the base layer 51 includes at least one layer of a stretched polyester resin layer and a stretched polyamide resin layer, so that the barrier layer 52 can be protected during processing of the exterior film 50 and breakage of the exterior film 50 can be suppressed. In addition, 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, in terms 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 base layer 51 may be configured to include both a stretched polyester resin layer and a stretched polyamide resin layer. The thickness of the base layer 51 is, for example, preferably 5 to 300 μm, and more preferably 20 to 150 μm, from the viewpoint of film strength.

[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 viewpoints of processability such as moisture resistance and extensibility, and cost. The aluminum foil preferably contains iron from the viewpoints 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%, and more preferably 0.7 to 2.0 mass%. When the iron content is 0.5 mass% or more, the exterior film 50 can obtain packaging suitability, excellent pinhole resistance, and extensibility. In addition, when the iron content is 5.0 mass% or less, the exterior film 50 can obtain excellent flexibility. The barrier layer 52 may include a metal foil, a vapor deposition film, and a resin layer having barrier properties. Examples of the 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, for example, preferably 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, the increase in 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] In addition, when the barrier layer 52 is an aluminum foil, it is preferable that at least the surface opposite to the base layer 51 is provided with a corrosion-resistant film in order to prevent dissolution and corrosion. The barrier layer 52 may be provided with a corrosion-resistant film on both sides. Here, the corrosion-resistant film refers to a thin film that is provided with corrosion resistance (e.g., acid resistance, alkali resistance, etc.) on the barrier layer 52 by performing, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment such as nickel or chromium, or corrosion prevention treatment by applying a coating agent on the surface of the barrier layer 52. Specifically, the corrosion-resistant film refers to a film that improves the acid resistance of the barrier layer 52 (acid-resistant film), a film that improves the alkali resistance of the barrier layer 52 (alkali-resistant film), etc. The treatment for forming the corrosion-resistant film may be one type, or two or more types may be combined. In addition, not only one layer but also multiple layers may be formed. Furthermore, among these treatments, hydrothermal conversion treatment and anodizing treatment are treatments in which the metal foil surface is dissolved by 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. In addition, when 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 moisture, and in particular 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, for example, via an adhesive layer 55. The heat-sealable resin layer 53 included in the exterior film 50 is a layer that imparts heat-sealing sealability 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. The thickness of the heat-sealable resin layer 53 is preferably, for example, 20 to 300 μm, more preferably 40 to 150 μm, from the viewpoints of sealability and strength.

[0045] The exterior film 50 preferably has one or more layers having 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 via the base material layer 51, the barrier layer 52, etc.

[0046] The material constituting the buffer layer can be arbitrarily selected from materials having cushioning properties. The material having cushioning properties is, for example, rubber, nonwoven fabric, or foam sheet. The rubber is, for example, natural rubber, fluororubber, or 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 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 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. Among these, the thickness of the buffer layer is 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 thickness of the buffer layer is preferably 0.5 mm. When the buffer layer is made of rubber, the upper limit of the thickness of the buffer layer is preferably 10 mm, more preferably 5 mm, and more preferably 2 mm. When the buffer layer is made of rubber, the preferred range of the thickness of the buffer layer 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 electricity storage device 10 is dropped or by handling during production of the electricity storage device 10.

[0049] In this embodiment, in a state where the exterior film 50 is wrapped around the electrode body 20 so as to have the opening 40A, the surfaces (heat-fusible resin layer 53) of the exterior film 50 facing each other are heat-sealed to form the first sealed portion 70. In this embodiment, the first sealed portion 70 extends in the longitudinal direction of the exterior body 40. The position where the first sealed portion 70 is formed in the exterior body 40 can be arbitrarily selected. In this embodiment, the root 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 root 70X of the first sealed portion 70 may be located on any surface of the exterior body 40. In this 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 is, 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 constituting the lid 60 include polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polyethylene resins, fluorine 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 suitably heat-sealing the lid 60 and the exterior film 50, it is preferable that the main material of the material constituting the lid 60 and the material constituting the heat-sealable resin layer 53 of the exterior film 50 are the same. In this embodiment, the main materials of the material constituting the lid 60 and the material constituting the heat-sealable resin layer 53 are, for example, 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. The main material refers to a material that accounts for 50% or more of the materials contained in a component.

[0051] In this embodiment, from the viewpoint of suitably arranging the electrode terminal 30 at a desired position, the lid body 60 has a first part 61 and a second part 62 which are divided. The lid body 60 may be configured to include three or more parts. The first part 61 and the second part 62 and the electrode terminal 30 are preferably joined by at least one selected from ultrasonic sealing, high frequency sealing, heat sealing, hot plate welding, and adhesive, via the adhesive film 31 as necessary. Since the electrode terminal 30 and the lid body 60 are firmly joined, the electrode terminal 30 can be suitably held by the lid body 60. When the adhesive film 31 is not joined to the electrode terminal 30, the first part 61 and the second part 62 and the electrode terminal 30 are preferably joined by an adhesive. Examples of the adhesive include hot melt 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 the electrode terminal 30 can be sandwiched between them 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 to be joined to the second part 62, and a recess 61B recessed from the part joint 61A. The shape of the recess 61B in plan view can be selected arbitrarily as long as it can accommodate a part of the electrode terminal 30. In this embodiment, the shape of the recess 61B in plan view is rectangular. The recess 61B has a side surface 61BX and a bottom surface 61BY. The adhesive film 31 to be joined to the electrode terminal 30 is joined to the side surface 61BX and the bottom surface 61BY. Since the first part 61 has the recess 61B, the position of the electrode terminal 30 relative to the first part 61 is unlikely to shift. In addition, the electrode terminal 30 can be easily disposed relative to the first part 61.

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

[0055] The depth of recess 61B (height of side surface 61BX) and the depth of recess 62B (height of side surface 62BX) can be selected arbitrarily as long as they are deep enough to accommodate the entire electrode terminal 30 with adhesive film 31 bonded thereto. In this embodiment, the depth of recess 61B is approximately half the entire thickness of electrode terminal 30. The depth of recess 62B is approximately half the entire thickness of electrode terminal 30 with adhesive film 31 bonded thereto. In other words, the sum of the depths of recess 61B and 62B is substantially equal to the entire thickness of 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 power 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 power storage device 10. The sealing surfaces 61X and 62X constitute the side surfaces of the lid body 60. The exposed surfaces 61Y and 62Y are the surfaces of the lid body 60 on the opposite side to the surface facing the electrode body 20. It is preferable that a barrier film 100 having at least one of gas barrier properties and water vapor barrier properties is bonded to at least a part of the exposed surfaces 61Y and 62Y. In this embodiment, the barrier film 100 is bonded to almost 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 and the exposed surfaces 61Y, 62Y of the lid 60 are joined. In another example, the barrier film 100 may be a deposition 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 joined, for example, by an adhesive. The outer contour of the barrier film 100 does not need to match the outer contour of the exposed surfaces 61Y, 62Y. For example, a barrier film 100 larger than the outer contour of the exposed surfaces 61Y, 62Y may be prepared, and the parts of the barrier film 100 that protrude from the outer contour of the exposed surfaces 61Y, 62Y may be folded and joined 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 protruding 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, by an adhesive or the like.

[0057] When 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 volatilization of the organic solvent as the electrolyte and the decomposition of the electrolytic solution. When the electricity storage device 10 is a capacitor, gases may be generated due to chemical reactions in the capacitor. When the electricity storage device 10 is an all-solid-state battery, the electrode body 20 may include a solid electrolyte that may generate gas. For example, when the solid electrolyte is a sulfide-based electrolyte, hydrogen sulfide gas may be generated. When the barrier film 100 has gas barrier properties, leakage of these gases to the outside of the exterior body 40 is suppressed. When 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 heat-sealing resin layer 53 of the exterior film 50 and the sealing surfaces 61X, 62X of the lid body 60 are heat-sealed to form the second sealing portion 80. Hereinafter, the seal strength between the heat-sealing resin layer 53 of the exterior film 50 and the sealing surfaces 61X, 62X of the lid body 60 may be referred to as the seal strength of the second sealing portion 80. The seal strength of the second sealing portion 80 is the seal strength between the heat-sealing resin layer 53 and the lid body 60 at the long side portions of the sealing surfaces 61X, 62X, that is, the seal strength between the heat-sealing resin layer 53 and the lid body 60 at the sealing surfaces 61X, 62X extending in the LR (width) direction in FIG. 1. The seal strength of the second sealing portion 80 is measured based on the distance of the second sealing portion 80 in the FB (depth) direction when the exterior film 50 is pulled against the lid body 60 in the UD (vertical) direction in FIG. 1. In the case where the lid body 60 is divided into multiple parts including long and short sides as in this embodiment, the sealing strength of the second sealing portion 80 is the sealing strength at 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 body 20 is sealed by the exterior body 40, the seal strength of the second sealing portion 80 is preferably 40N / 15mm or more, more preferably 50N / 15mm or more, more preferably 60N / 15mm or more, more preferably 70N / 15mm or more, and more preferably 85N / 15mm or more. When the seal strength of the second sealing portion 80 is 40N / 15mm or more, the state in which the electrode body 20 is sealed by the exterior body 40 is suitably maintained even if the electricity storage device 10 is used for, for example, several years (less than 10 years). When the seal strength of the second sealing portion 80 is 85N / 15mm or more, the state in which the electrode body 20 is sealed by the exterior body 40 is suitably maintained even if the electricity storage device 10 is used for, for example, 10 years or more. The seal strength of the second sealing portion 80 is preferably 150N / 15mm or less. A preferred range of 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 has a certain degree of thickness so that deformation of the exterior body 40 is suppressed even when the power storage device 10 is arranged in a stacked manner. From another viewpoint, 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 degree of thickness so that the sealing surfaces 61X, 62X of the lid body 60 and the exterior film 50 can be suitably heat-sealed when the second sealing portion 80 is formed. The minimum value of the thickness of the lid body 60 is, for example, 1.0 mm, more preferably 3 mm, and further preferably 4 mm. The maximum value of the thickness of the lid body 60 is, for example, 10 mm, more preferably 8.0 mm, and further preferably 7.0 mm. The maximum value of the thickness of the lid body 60 may be 10 mm or more. The preferred ranges of 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 expressed as a plate-like shape, the material constituting the lid body 60 does not include a film defined by the [Packaging Terminology] standard of the JIS (Japan Industrial Standards). The thickness of the lid body 60 may vary depending on the part of the lid body 60. When the thickness of the lid body 60 varies depending on the part, the thickness of the lid body 60 is the thickness of the thickest part.

[0061] <1-2. Manufacturing method of electricity storage device> 5 is a flowchart showing an example of a method for manufacturing the power storage device 10. The method for manufacturing the power 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 power storage device 10. Note that in this embodiment, the first step to the eighth step are merely names of the steps defined for convenience, and do not refer to the order of the steps.

[0062] In a 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 equipment sandwiches the electrode terminal 30 between the first part 61 and the second part 62. The manufacturing equipment bonds the first part 61 and the second part 62 to the electrode terminal 30 by at least one selected from ultrasonic sealing, high frequency sealing, heat sealing, hot plate welding, and adhesives. Completion of the third step completes an object in which the electrode terminal 30 and the lid 60 are bonded (hereinafter referred to as a "lid unit 90"). The first to third steps correspond to a manufacturing method for 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 device heat-seals the opposing heat-fusible resin layers 53 of the exterior film 50 to form a first sealing portion 70 (hereinafter referred to as a "temporary first sealing portion") having a part that is unsealed. The unsealed portion can be formed, for example, by using a seal bar having a shape that does not contact the exterior film 50. In another example, the unsealed portion can be formed by interposing a fluororesin film or the like between the mutually facing surfaces (heat-fusible resin layers 53) of the exterior film 50. By forming the temporary first sealing portion before the second sealing portion 80, the electrode body 20 can be held by the exterior film 50, so that the position of the electrode body 20 relative to the exterior film 50 is unlikely to shift. Therefore, when the second sealing portion 80 is formed, the occurrence of wrinkles is suppressed.

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

[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 an 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. When the power 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 power 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] In the example shown in Fig. 6, in a ninth step of step S21 performed after the first step of step S11 or the second step of step S12, the manufacturing equipment electrically connects the electrode terminal 30 and the electrode of the electrode body 20. In a tenth step of step S22 performed after the ninth step, the manufacturing equipment sandwiches the electrode terminal 30 between the first part 61 and the second part 62, and bonds 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. In the example shown in Fig. 6, in the tenth step, the lid body 60 may cover, for example, a portion where the current collecting foil of the electrode body 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 divided 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 disposed at a desired position.

[0073] Furthermore, in the electricity storage device described in Patent Document 1 (JP 2019-153504 A), no consideration is given to a method for fixing the lid and the electrode terminals, which may lead to misalignment of the electrode terminals with respect to the lid.

[0074] According to the electricity storage device of this embodiment, the electrode terminal 30 is joined by at least one selected from ultrasonic sealing, high frequency sealing, heat sealing, hot plate welding, and an adhesive, if necessary via an adhesive film 31. Since the electrode terminal 30 and the lid body 60 are firmly joined, the electrode terminal 30 can be suitably held by the lid body 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 at a position 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 a shape similar to that of the second part 62 of the second embodiment, and has a seal surface 62X to be 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 recess 62B is formed in the thick portion 262X and the thin portion 262Y. In this embodiment, the thin portion 262Y is formed at a position closer to the electrode body 20 than the thick portion 262X. The thin portion 262Y may be formed at a position farther 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 electricity storage device 10 of the second embodiment, the lid body 260 has thin portions 261Y, 262Y, and therefore the electrode terminal 30 and the thin portions 261Y, 262Y can be firmly joined 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 differences from the lid body 60 of the first embodiment.

[0080] <3-1. Lid structure> FIG. 8 is an exploded view of the lid 360 as seen from the front. 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 convex portion 371 formed on one of the first part 361 and the second part 362, and a concave portion 372 formed on the other of the first part 361 and the second part 362, into which the convex portion 371 is inserted. In this embodiment, the convex portion 371 is formed in the part joint portion 61A of the first part 361. In this embodiment, the concave portion 372 is formed in the part joint portion 62A of the second part 362. The shape of the convex portion 371 can be selected arbitrarily. In this embodiment, the convex portion 371 is a hemisphere. The shape of the convex portion 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 recess 372 has a shape into which the protrusion 371 can be inserted.

[0081] <3-2. Actions and Effects of Electricity Storage Devices> According to the electricity accumulation device 10 of the third embodiment, the lid body 360 has the positioning portion 370, so that the third process of step S13 shown in FIG. 5 and the tenth process 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 has a function 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 body 460 has a connecting portion 463, and therefore the first part 461 and the second part 462 are not separated. This makes it possible to easily manage the lid body 460. Furthermore, by closing one of the first part 461 and the second part 462 against the other, the electrode terminal 30 can be sandwiched. Since the positioning of the other of the first part 461 and the second part 462 relative to one of the first part 461 and the second part 462 can be easily performed, 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 differences from the lid body 60 of the first embodiment.

[0086] <5-1. Lid structure> FIG. 10 is an exploded view of the cover 560 as seen from the front. The cover 560 has 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 made of metal to the first part 561 and the second part 562 made of resin. In this embodiment, the joint 563 can be made of a 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 these polyolefin resins with an acid such as maleic anhydride. 10, the connecting body 563 is preferably connected to the entirety of the recess 61B of the first part 561 and the entirety of the recess 62B of the second part 562. The connecting body 563 may be connected only to the bottom surface 61BY of the recess 61B. The connecting body 563 may be connected only to the bottom surface 62BY of the recess 62B.

[0087] <5-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the fifth embodiment, since the lid body 560 has the bonding body 563, it is not necessary 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 differences from the lid body 560 of the fifth embodiment.

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

[0090] <6-2. Actions and Effects of Electricity Storage Devices> According to the electricity storage device 10 of the sixth embodiment, since the lid body 660 has the bonding body 663, it is not necessary 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 body 763. The first part 761 has a shape obtained by omitting the recess 61B from the first part 661 (see FIG. 11), that is, a rectangular parallelepiped. The second part 762 has a shape obtained by omitting the recess 62B from the second part 662 (see FIG. 11), that is, a rectangular parallelepiped. The bonding body 763 is, for example, the adhesive film 31 of the first embodiment. The bonding body 763 is bonded to the upper surface of the first part 761 so as to cover the entire upper surface of the first part 761. In the example shown in FIG. 12, the bonding body 763 protrudes from both ends of the upper surface of the first part 761. The bonding body 763 is bonded to the lower surface of the second part 762 so as to cover the entire lower surface of the second part 762. 12, the bonding body 763 protrudes from both ends of the lower surface of the second part 762. When a minute 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 type of sealing 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, since the lid body 760 has the bonding body 763, it is not necessary 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-mentioned embodiments are examples of possible forms of the lid, lid unit, electricity storage device, method for manufacturing the lid unit, and method for manufacturing the 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 the lid unit, and method for manufacturing the electricity storage device according to the present invention may take forms different from those exemplified in the respective embodiments. One example of such a form is a form in which a part of the configuration of each embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to each embodiment. Below, some examples of modified forms of each embodiment are shown. The above-mentioned 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 changed arbitrarily. 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 is changed to be a depth equal to or greater than the entire 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, a minute gap may be formed between the first part 61 and the second part 62 at both ends of the electrode terminal 30. This gap is preferably filled with an adhesive such as hot melt. At least one selected from ultrasonic sealing, high frequency sealing, heat sealing, and hot plate welding may be applied to the first part 61 and the second part 62 to fill the gap at both ends of the electrode terminal 30.

[0096] <8-2> In the electricity accumulation 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 or 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 body 260 may be integrally configured. In other words, the lid body 260 may be configured as one part. According to this modification, it is preferable to form a hole penetrating the lid body 260 instead of the recess 61B and the recess 62B. After the lid body 260 is molded, the electrode terminal 30 may be inserted into the hole and joined to the lid body 260 by at least one selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and adhesive. The lid bodies 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 one part.

[0098] <8-4> In the electricity storage device 10 of the third embodiment, the configuration of the lid 360 can be changed arbitrarily. For example, the positioning portion 370 may be a pattern drawn or attached to the first part 361 and the second part 362. Furthermore, the convex portion 371 may be formed in the part joint portion 62A of the second part 362, and the concave portion 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 arranged can be sealed by a known method. For example, the portion where the other lid body 60 is arranged may be sealed with a known lid body formed of one 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 electricity storage device 10 of the first embodiment, the exterior film 50 may be a laminate (laminate film) having a thermally adhesive resin layer 53 on both sides of the barrier layer 52. In this modification, the first sealing portion 70 may be formed by heat-sealing the thermally adhesive resin layers 53 laminated on one side or the other side of the barrier layer 52 to each other, or may be formed by heat-sealing the thermally adhesive resin layer 53 laminated on one side of the barrier layer 52 and the thermally adhesive 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 in the vicinity of the side 43 at the boundary between the first surface 41 and the second surface 42. In this modification, the thermally adhesive 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, 760 of the electricity storage device 10 of the first, third, fourth, fifth, sixth and seventh embodiments may also have a thick portion and a thin portion, similar to the lid 260 of the electricity storage device 10 of the second embodiment. When the lids 60, 260, 360, 460, 560, 660, 760 have a thick portion and a thin portion, the means for joining the thin portion of the lid 60 or the like to the electrode terminal 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: 2nd part 62B: Recess 62Y: Exposed surface 90: Lid unit 100: Barrier film 260: Lid 261: First part 261X: Thick part 261Y: Thin section 262: 2nd part 262X: Thick part 262Y: Thin section 360: Lid 361: First part 362: 2nd part 370: Positioning section 371: Convex 372: Recess 460: Lid 461: First part 462: Part 2 463 :Connection part 560: Lid 561: First part 562: Part 2 563 :zygote 660: Lid 661: First part 662: 2nd part 663 :zygote 760: Lid 761: First part 762: 2nd 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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