Cover body, cover body unit and manufacturing method thereof, electricity storage device and manufacturing method thereof

Abstract

Provided is a cover body for an electricity storage device, the electricity storage device comprising an electrode body, an electrode terminal electrically connected to the electrode body, and an exterior film wound around the electrode body so as to have an opening, the cover body being disposed in the opening, the cap and the electrode terminal are joined by at least one means selected from the group consisting of ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and an adhesive.

Description

[0001] (This application is a divisional application of application number 202380023701.4 filed on February 27, 2023.) Technical Field

[0002] The present invention relates to a cover, a cover unit, an electricity storage device, a method for manufacturing the cover unit, and a method for manufacturing the electricity storage device. Background Art

[0003] Patent document 1 discloses an all-solid-state battery as an example of an electrical storage device. The all-solid-state battery includes an electrode body, an electrode terminal, and an outer casing that seals the electrode body. The outer casing includes an outer film wound around the electrode body in a manner having an opening and a cover body disposed at 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 cover body. The electrode terminal penetrates the cover body.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-153504 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] In the above-mentioned power storage device, in order to make the electrode terminal pass through the cover body, for example, a method of inserting the cover body into the electrode terminal arranged in the mold can be considered. However, the electrode terminal is relatively small relative to the cover body, so it is difficult to accurately arrange it at a predetermined position in the mold. In addition, the electrode terminal is light in weight, so when the mold is filled with resin, the position of the electrode terminal may be misaligned relative to the mold. Therefore, it is difficult to arrange the electrode terminal at a desired position relative to the cover body.

[0009] An object of the present invention is to provide a cover body capable of appropriately arranging an electrode terminal at a desired position, a cover body unit including the cover body, an electricity storage device, a method for manufacturing the cover body unit, and a method for manufacturing the electricity storage device.

[0010] Technical means of solving problems

[0011] The cover body of the first aspect of the present invention is a cover body for an energy storage device, wherein the energy storage device includes an electrode body, an electrode terminal electrically connected to the electrode body, and an outer film wound around the electrode body in a manner having an opening portion, wherein the cover body is arranged at the opening portion and includes a first component and a second component that clamp the electrode terminal in a manner that enables electric power input and output via the electrode terminal.

[0012] The cover body of the second aspect of the present invention is a cover body for an energy storage device, wherein the energy storage device includes an electrode body, an electrode terminal electrically connected to the electrode body, and an outer film wound around the electrode body in a manner having an opening, the cover body being arranged at the opening, and the cover body and the electrode terminal being joined by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding and adhesive.

[0013] A cover body according to a third aspect of the present invention is the cover body according to the second aspect, and further comprises a thick portion joined to the exterior film and a thin portion connected to the thick portion and joined to the electrode terminal.

[0014] The cover body of the fourth aspect of the present invention is a cover body for an energy storage device, wherein the energy storage device includes an electrode body, an electrode terminal electrically connected to the electrode body, and an outer film wound around the electrode body in a manner having an opening portion, wherein the cover body is arranged at the opening portion and has a thick-walled portion joined to the outer film and a thin-walled portion connected to the thick-walled portion and joined to the electrode terminal.

[0015] A cover body according to a fifth aspect of the present invention is the cover body according to any one of the second to fourth aspects, wherein the cover body includes a first member and a second member that sandwich the electrode terminal so that electric power can be input and output through the electrode terminal.

[0016] A cover body according to a sixth aspect of the present invention is the cover body according to the first aspect or the fifth aspect, wherein at least one of the first member and the second member has a recessed portion for accommodating the electrode terminal.

[0017] A cover body according to a seventh aspect of the present invention is the cover body according to the first, fifth or sixth aspect, wherein the first member and the second member have a positioning portion for sandwiching the electrode terminal.

[0018] The cover body according to the eighth aspect of the present invention is based on the cover body according to the seventh aspect, and the positioning portion includes: a convex portion formed on one of the first component and the second component; and a concave portion formed on the other of the first component and the second component for the convex portion to be inserted.

[0019] The cover body according to the ninth aspect of the present invention is based on the cover body according to the first aspect or any one of the fifth to eighth aspects, and further has a connecting portion connecting the first member and the second member, and one of the first member and the second member is configured to be able to be opened and closed relative to the other via the connecting portion.

[0020] The cover body according to a tenth aspect of the present invention is the cover body according to the first aspect or any one of the fifth to ninth aspects, and further comprises a bonding body which is arranged between the electrode terminal and at least one of the first member and the second member and is bonded to metal and resin.

[0021] A cover according to an eleventh aspect of the present invention is the cover according to the tenth aspect, wherein the bonded body includes at least one of a film, a resin molded body, and a membrane.

[0022] The cover body of the twelfth aspect of the present invention is based on the cover body of the first aspect or any one of the fifth to eleventh aspects, wherein the first component and the second component have an exposed surface exposed to the outside of the power storage device, and a barrier film is bonded to at least a portion of the exposed surface, and the barrier film has at least one of gas barrier property and water vapor barrier property.

[0023] A cover body according to a thirteenth aspect of the present invention is the cover body according to the first aspect, wherein at least one of the first member and the second member has a thick portion joined to the exterior film and a thin portion connected to the thick portion and joined to the electrode terminal.

[0024] The cover body according to the fourteenth aspect of the present invention is based on the cover body according to the first aspect, wherein at least one of the first component and the second component is joined to the electrode terminal by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding and adhesive.

[0025] A cover unit according to a fifteenth aspect of the present invention includes: the cover according to the first aspect or any one of the fifth to fourteenth aspects, and the electrode terminal sandwiched by the first member and the second member.

[0026] A cover unit according to a sixteenth aspect of the present invention includes: the cover according to any one of the second to fifth aspects, and the electrode terminal joined to the cover.

[0027] A power storage device according to a seventeenth aspect of the present invention includes the cover body according to any one of the first to fourteenth aspects.

[0028] The manufacturing method of the cover unit of the eighteenth aspect of the present invention is used to manufacture the cover unit described in the fifteenth aspect, including: a process of clamping the electrode terminal using the first component and the second component in a manner that enables electric power input and output via the electrode terminal; and a process of joining the first component and the second component to the electrode terminal.

[0029] A method for manufacturing a cover unit according to a nineteenth aspect of the present invention is for manufacturing the cover unit according to the sixteenth aspect, and includes a step of joining the cover to the electrode terminal.

[0030] The manufacturing method of the energy storage device of the twentieth aspect of the present invention is used to manufacture the energy storage device, the energy storage device comprising: an electrode body, an electrode terminal electrically connected to the electrode body, an outer film wound around the electrode body in a manner having an opening, and a cover body arranged at the opening, the cover body comprising a first component and a second component, the manufacturing method of the energy storage device comprising: a process of clamping the electrode terminal using the first component and the second component in a manner that electric power can be input and output via the electrode terminal; and a process of joining the first component and the second component to the electrode terminal.

[0031] The manufacturing method of the energy storage device of the twenty-first aspect of the present invention is used to manufacture the energy storage device, and the energy storage device includes: an electrode body, an electrode terminal electrically connected to the electrode body, an outer film wound around the electrode body in a manner having an opening, and a cover body arranged at the opening. The manufacturing method of the energy storage device includes: a process of joining the cover body to the electrode terminal by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding and adhesive.

[0032] The manufacturing method of the energy storage device of the twenty-second aspect of the present invention is used to manufacture the energy storage device, and the energy storage device includes: an electrode body, an electrode terminal electrically connected to the electrode body, an outer film wound on the electrode body in a manner having an opening, and a cover body arranged at the opening, the cover body having a thick-walled portion joined to the outer film and a thin-walled portion connected to the thick-walled portion and joined to the electrode terminal, and the manufacturing method of the energy storage device includes a step of joining the thin-walled portion to the electrode terminal.

[0033] Effects of the Invention

[0034] According to the cover body, the cover body unit, the electricity storage device, the method for manufacturing the cover body unit, and the method for manufacturing the electricity storage device of the present invention, the electrode terminal can be appropriately arranged at a desired position. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a perspective view of the power storage device according to the first embodiment.

[0036] Figure 2 Yes means Figure 1 A cross-sectional view of the layer structure of an outer film included in an electric storage device.

[0037] Figure 3 yes Figure 1 A front view of a cover body and electrode terminals included in an electric storage device.

[0038] Figure 4 yes Figure 3 Side view of the cover and electrode terminals.

[0039] Figure 5 Yes means Figure 1 A flowchart of an example of a method for manufacturing an electric storage device.

[0040] Figure 6 Yes means Figure 1 A flowchart of another example of a method for manufacturing an electric storage device.

[0041] Figure 7 It is a side view of a cover body provided in the electric storage device according to the second embodiment.

[0042] Figure 8 This is an exploded view of a cover body provided in the electric storage device according to the third embodiment when viewed from the front.

[0043] Fig. 9 It is a front view of a state in which the second member of a cover body provided in the electric storage device according to the fourth embodiment is opened relative to the first member.

[0044] Fig.10 This is an exploded view of a cover body provided in the power storage device according to the fifth embodiment when viewed from the front.

[0045] Fig.11 This is an exploded view of a cover body provided in the electric storage device according to the sixth embodiment when viewed from the front.

[0046] Fig.12 It is a front view of a cover body provided in the electric storage device according to the seventh embodiment. DETAILED DESCRIPTION

[0047] Hereinafter, an electric storage device according to an embodiment of the present invention will be described with reference to the drawings. In this specification, the numerical range indicated by "to" means "above" or "below". For example, the expression 2 to 15 mm means above 2 mm and below 15 mm.

[0048] [1. First embodiment]

[0049] <1-1. Structure of power storage device>

[0050] Figure 1 It is a plan view schematically showing the power storage device 10 according to the first embodiment. Figure 2 Yes means Figure 1 2 is a cross-sectional view of a layer structure of an exterior film 50 included in an electric storage device 10 . Figure 3 yes Figure 1 FIG. 1 is a front view of a cover body 60 and an electrode terminal 30 included in an electric storage device 10 . Figure 4 yes Figure 3 60 and the electrode terminal 30. Figure 1 In the figure, the arrow UD direction indicates the thickness direction of the power storage device 10, the arrow LR direction indicates the width direction of the power storage device 10, and the arrow FB direction indicates the depth direction of the power storage device 10. The directions indicated by the arrows UD, LR, and FB are also common in the following figures.

[0051] The power storage device 10 includes an electrode body 20, an electrode terminal 30 and an outer body 40. The electrode body 20 includes, for example, electrodes (positive and negative electrodes) and a separator that constitute a power storage component such as a lithium-ion battery, a capacitor or an all-solid-state battery. In the present embodiment, the shape of the electrode body 20 is roughly rectangular. In addition, "roughly rectangular" includes, in addition to a complete rectangular, a three-dimensional shape that can be regarded as a rectangular by correcting the shape of a part of the outer surface. The shape of the electrode body 20 can be, for example, a cylinder or a polygonal column.

[0052] In the present embodiment, the power storage device 10 includes two electrode terminals 30. The electrode terminal 30 is a metal terminal for inputting and outputting power in 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 extends outward from the edge of the outer casing 40, for example. In addition, the electrode terminal 30 only needs to be able to input and output power to the electrode body 20, and for example, it does not need to extend from the outer casing 40.

[0053] The metal material constituting the electrode terminal 30 is, for example, aluminum, nickel, or copper. 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, and the electrode terminal 30 connected to the negative electrode is usually made of copper, nickel, etc. In addition, 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.

[0054] The outer package 40 seals the electrode body 20. The outer package 40 includes an outer film 50 and a lid 60. The outer film 50 is wound around the electrode body 20 to have an opening 40A, and the lid 60 is disposed on the side of the electrode body 20 to close the opening 40A.

[0055] From the viewpoint of proper adhesion to the cover 60, it is preferred that an adhesive film 31 (see Figure 3). The adhesive film 31 can be any film as long as it can adhere the electrode terminal 30 made of metal to the cover 60 made of resin. The adhesive film 31 can be 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 grafting and modifying these polyolefin resins with an acid such as maleic anhydride. The adhesive film 31 can be a single layer or a film of more than two layers. In the present embodiment, the adhesive film 31 is bonded to substantially the entire portion of the electrode terminal 30 covered by the cover 60. In addition, hereinafter, in the electrode terminal 30 in a state where the adhesive film 31 is bonded, the thickness of the electrode terminal 30 including the adhesive film 31 is sometimes referred to as the thickness of the electrode terminal 30 as a whole.

[0056] For example, there is a method of forming a storage portion (depression) for storing the electrode body 20 in the outer film 50 by cold forming. However, it is not necessarily easy to form a deep storage portion by such a method. If the storage portion (depression) is formed deeper (for example, a forming depth of 15 mm) by cold forming, pinholes or cracks will be generated in the outer film 50, resulting in a higher possibility of reduced battery performance. On the other hand, the outer body 40 seals the electrode body 20 by winding the outer film 50 around the electrode body 20, so the electrode body 20 can be easily sealed regardless of the thickness of the electrode body 20. In addition, in order to increase the volume energy density of the energy storage device 10 and reduce the dead zone between the electrode body 20 and the outer film 50, the outer film 50 is preferably wound in a manner in contact with the outer surface of the electrode body 20. In addition, when the energy storage device 10 is an all-solid-state battery, from the perspective of uniformly applying high pressure from the outer surface of the battery in order to exert the battery performance, it is also necessary to eliminate the space between the electrode body 20 and the outer film 50. Therefore, the outer film 50 is preferably wound in a manner that is in contact with the outer surface of the electrode body 20.

[0057] like Figure 2 As shown in the figure, the outer film 50 is, for example, a laminate (laminated film) having a base layer 51, a barrier layer 52, and a hot-melt resin layer 53 in this order. The outer film 50 does not need to include all these layers, and for example, the barrier layer 52 may not be included. That is, the outer film 50 only needs to be made of a flexible and easily bendable material, and for example, it may be made of a resin film. In addition, the outer film 50 is preferably heat-sealable.

[0058] The base layer 51 included in the outer film 50 is a layer for imparting heat resistance to the outer film 50 and suppressing the generation of pinholes that may occur during processing or circulation. The base layer 51 is composed of, for example, at least one of a stretched polyester resin layer and a stretched polyamide resin layer. For example, since the base layer 51 includes at least one of a stretched polyester resin layer and a stretched polyamide resin layer, it is possible to protect the barrier layer 52 during processing of the outer film 50 and suppress the breakage of the outer film 50. In addition, from the viewpoint of increasing the tensile elongation of the outer 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 perspective 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. In addition, the base layer 51 may also be composed of two layers including a stretched polyester resin layer and a stretched polyamide resin layer. From the viewpoint of film strength, the thickness of the base material layer 51 is, for example, preferably 5 to 300 μm, and more preferably 20 to 150 μm.

[0059] The barrier layer 52 is bonded to the substrate layer 51, for example, via an adhesive layer 54. From the perspective of processability and cost such as moisture resistance and ductility, the barrier layer 52 contained in the outer film 50 is, for example, composed of aluminum foil. From the perspective of packaging adaptability and pinhole resistance when packaging the electrode body 20, the aluminum foil preferably contains iron. The iron content in the aluminum foil is preferably 0.5 to 5.0% by mass, and more preferably 0.7 to 2.0% by mass. By making the iron content 0.5% by mass or more, the packaging adaptability, excellent pinhole resistance and ductility of the outer film 50 can be obtained. In addition, by making the iron content 5.0% by mass or less, the excellent softness of the outer film 50 can be obtained. The barrier layer 52 may include a metal foil, a vapor-deposited coating and a resin layer having barrier properties. As a metal foil, for example, aluminum alloy, stainless steel, titanium steel or steel plate can be cited.

[0060] From the viewpoint of barrier properties, pinhole resistance and packaging adaptability, the thickness of the barrier layer 52 is preferably 15 to 100 μm, and more preferably 30 to 80 μm. By setting the thickness of the barrier layer 52 to be 15 μm or more, the outer film 50 is not easily broken even when subjected to stress due to packaging processing. By setting the thickness of the barrier layer 52 to be 100 μm or less, the increase in mass of the outer film 50 can be reduced, and the reduction in the weight energy density of the power storage device 10 can be suppressed.

[0061] In addition, in the case where the barrier layer 52 is an aluminum foil, in order to prevent dissolution, corrosion, etc., it is preferred that at least the surface opposite to the substrate layer 51 has a corrosion-resistant film. The barrier layer 52 may have a corrosion-resistant film on both sides. Here, the corrosion-resistant film refers to a coating that is subjected to a hydrothermal modification treatment such as boehmite treatment, a chemical conversion treatment, anodizing treatment, a plating treatment such as nickel or chromium, or an anti-corrosion treatment such as coating a coating agent on the surface of the barrier layer 52, so that the barrier layer 52 has corrosion resistance (such as acid resistance, alkali resistance, etc.). 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. As a treatment for forming a corrosion-resistant film, one type may be performed, or a combination of two or more types may be performed. In addition, it may be not only one layer, but also multiple layers. Furthermore, among these treatments, the hydrothermal modification treatment and the anodic oxidation treatment are treatments in which the surface of the metal foil is dissolved by a treatment agent to form a metal compound having excellent corrosion resistance. In addition, these treatments are sometimes included in the definition of chemical conversion treatment. In addition, when the barrier layer 52 has a corrosion-resistant film, the corrosion-resistant film is included as the barrier layer 52.

[0062] The corrosion-resistant film has the following effects when the outer film 50 is formed: preventing delamination between the barrier layer 52 (for example, aluminum alloy foil) and the substrate layer 51, preventing the surface of the barrier layer 52 from being dissolved and corroded by hydrogen fluoride generated by the reaction of the electrolyte and water, especially preventing the aluminum oxide on the surface of the barrier layer 52 from being dissolved and corroded when the barrier layer 52 is an aluminum alloy foil, and improving the adhesion (wettability) of the surface of the barrier layer 52 to prevent delamination of the substrate layer 51 and the barrier layer 52 during heat sealing and during forming.

[0063] The hot-melt resin layer 53 is bonded to the barrier layer 52 via, for example, an adhesive layer 55. The hot-melt resin layer 53 included in the exterior film 50 is a layer that imparts heat-sealability to the exterior film 50. Examples of the hot-melt resin layer 53 include a resin film 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 viewpoint of sealing properties and strength, the thickness of the hot-melt resin layer 53 is preferably, for example, 20 to 300 μm, and more preferably 40 to 150 μm.

[0064] The exterior film 50 preferably has one or more layers having a buffer function (hereinafter referred to as "buffer layer") on the outside of the hot-melt resin layer 53, and more preferably on the outside of the barrier layer 52. The buffer layer may be laminated on the outside of the base layer 51, and the base layer 51 may also have the function of the buffer layer. When the exterior film 50 has a plurality of buffer layers, the plurality of buffer layers may be adjacent to each other or laminated with the base layer 51 or the barrier layer 52 interposed therebetween.

[0065] The material constituting the buffer layer can be arbitrarily selected from materials having buffering properties. The material having buffering properties is, for example, rubber, non-woven 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 non-woven fabric is preferably a material with excellent heat resistance. In the case where the buffer layer is composed of a non-woven fabric, the lower limit of the thickness of the buffer layer is preferably 100 μm, more preferably 200 μm, and further preferably 1000 μm. In the case where the buffer layer is composed of a non-woven fabric, the upper limit of the thickness of the buffer layer is preferably 5000 μm, more preferably 3000 μm. The preferred range of the thickness of the buffer layer is 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. The most preferred thickness range of the buffer layer is 1000 μm to 3000 μm.

[0066] 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 further 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.

[0067] When the outer film 50 has a buffer layer, the buffer layer functions as a buffer, thereby preventing the outer film 50 from being damaged by an impact when the power storage device 10 is dropped or by handling during the manufacture of the power storage device 10 .

[0068] In the present embodiment, in a state where the outer film 50 is wound around the electrode body 20 in a manner having an opening 40A, the mutually facing surfaces (hot-melt resin layers 53) of the outer film 50 are heat-sealed to each other, thereby forming a first sealing portion 70. In the present embodiment, the first sealing portion 70 extends in the longitudinal direction of the outer body 40. In the outer body 40, the formation position of the first sealing portion 70 can be arbitrarily selected. In the present embodiment, the root 70X of the first sealing portion 70 is located on the edge 43 of the boundary between the first surface 41 and the second surface 42 of the outer body 40. The area of ​​the first surface 41 is larger than the area of ​​the second surface 42. The root 70X of the first sealing portion 70 may also be located on any surface of the outer body 40. In the present embodiment, the first sealing portion 70 is folded, for example, toward the second surface 42 of the outer body 40. The first sealing portion 70 may extend further outward than the electrode body 20 when viewed from above, or may be folded toward the first surface 41.

[0069] The cover 60 as a whole is, for example, in a rectangular parallelepiped shape and is made of a resin material. In addition, the cover 60 can also be formed by, for example, cold forming the outer film 50. As the material constituting the cover 60, 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, or acid-modified polyolefin resins obtained by grafting and modifying these polyolefin resins with acids such as maleic anhydride, etc. can be cited. From the viewpoint of properly heat-sealing the cover 60 and the outer film 50, the material constituting the cover 60 and the material constituting the hot-melt resin layer 53 of the outer film 50 are preferably the same as the main material. In the present embodiment, as the material constituting the cover 60 and the material constituting the hot-melt resin layer 53, for example, polyolefin resins such as polyethylene resins and polypropylene resins or acid-modified polyolefin resins obtained by grafting and modifying these polyolefin resins with acids such as maleic anhydride are used as the main material. Here, the main material refers to, for example, a material that accounts for 50% or more of the materials included in the constituent element.

[0070] In the present embodiment, from the viewpoint of properly arranging the electrode terminal 30 at the desired position, the cover body 60 has a divided first member 61 and a second member 62. The cover body 60 may also be configured to include more than three members. The first member 61 and the second member 62 are preferably joined to the electrode terminal 30 via the adhesive film 31 as required by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding and adhesives. Since the electrode terminal 30 is firmly joined to the cover body 60, the electrode terminal 30 can be properly held by the cover body 60. In the case where the electrode terminal 30 is not joined to the adhesive film 31, it is preferred that the first member 61 and the second member 62 are joined to the electrode terminal 30 by an adhesive. The adhesive may be, for example, a hot melt adhesive or an adhesive used in dry lamination.

[0071] The shape of the first member 61 and the shape of the second member 62 can be arbitrarily selected as long as they can clamp the electrode terminal 30 in a manner that allows power input and output through the electrode terminal 30. The first member 61 and the second member 62 are preferably substantially the same shape. In the present embodiment, the first member 61 and the second member 62 are substantially the same shape.

[0072] The first member 61 is arranged below the second member 62. The first member 61 has a member joint portion 61A joined to the second member 62, and a recessed portion 61B recessed from the member joint portion 61A. The shape of the recessed portion 61B when viewed from above can be selected arbitrarily as long as it can accommodate a part of the electrode terminal 30. In the present embodiment, the shape of the recessed portion 61B when viewed from above is a rectangle. The recessed portion 61B has a side surface 61BX and a bottom surface 61BY. The adhesive film 31 joined to the electrode terminal 30 is joined to the side surface 61BX and the bottom surface 61BY. Since the first member 61 has the recessed portion 61B, the position of the electrode terminal 30 relative to the first member 61 is not easily offset. In addition, the electrode terminal 30 can be easily arranged relative to the first member 61.

[0073] The second member 62 has a member joint portion 62A joined to the first member 61, and a recessed portion 62B recessed from the member joint portion 62A. The shape of the recessed portion 62B when viewed from above can be arbitrarily selected as long as it can accommodate a portion of the electrode terminal 30 joined with the adhesive film 31. In the present embodiment, the shape of the recessed portion 62B when viewed from above is a rectangle. The recessed portion 62B has a side surface 62BX and a bottom surface 62BY. The adhesive film 31 joined to the electrode terminal 30 is joined to the side surface 62BX and the bottom surface 62BY. Since the second member 62 has the recessed portion 62B, the position of the electrode terminal 30 relative to the second member 62 is not easily offset. In addition, the electrode terminal 30 can be easily configured relative to the second member 62.

[0074] The depth of the recess 61B (the height of the side 61BX) and the depth of the recess 62B (the height of the side 62BX) can be arbitrarily selected as long as they are the depths that can accommodate the entire electrode terminal 30 in the state of being bonded with the adhesive film 31. In the present embodiment, the depth of the recess 61B is approximately half of the thickness of the entire electrode terminal 30. The depth of the recess 62B is approximately half of the thickness of the entire electrode terminal 30 in the state of being bonded with the adhesive film 31. That is, the sum of the depth of the recess 61B and the depth of the recess 62B is substantially equal to the thickness of the entire electrode terminal 30.

[0075] The first member 61 has a sealing surface 61X sealed with the outer film 50, and an exposed surface 61Y exposed to the outside of the power storage device 10. The second member 62 has a sealing surface 62X sealed with the outer film 50, and an exposed surface 62Y exposed to the outside of the power storage device 10. The sealing surfaces 61X and 62X constitute the side surfaces of the cover body 60. The exposed surfaces 61Y and 62Y are the surfaces on the opposite side of the surface of the cover body 60 facing the electrode body 20. It is preferred that a barrier film 100 having at least one of gas barrier properties and water vapor barrier properties is bonded to at least a portion of the exposed surfaces 61Y and 62Y. In the present embodiment, the barrier film 100 is bonded to substantially the entire exposed surfaces 61Y and 62Y. The specifications of the barrier film 100, for example, can be applied to the specifications of the outer film 50. In the case where the barrier film 100 has a hot-melt resin layer, the hot-melt resin layer of the barrier film 100 is bonded to the exposed surfaces 61Y and 62Y of the cover body 60. In another example, the barrier film 100 may also be a vapor-deposited film obtained by forming a metal such as aluminum, silicon oxide, aluminum oxide, etc. as a coating on the surface of a plastic film such as polyester, polypropylene or nylon by vacuum vapor deposition. In the case where the barrier film 100 does not have a hot-melt resin layer, the barrier film 100 is bonded to the exposed surfaces 61Y and 62Y of the cover body 60, for example, by an adhesive. In addition, the outer contour of the barrier film 100 does not need to be consistent with the outer contour of the exposed surfaces 61Y and 62Y. For example, a barrier film 100 larger than the outer contour of the exposed surfaces 61Y and 62Y can be prepared, and the portion of the barrier film 100 extending from the outer contour of the exposed surfaces 61Y and 62Y can be bent and bonded to the sealing surfaces 61X and 62X. The portion of the barrier film 100 bonded to the sealing surfaces 61X and 62X is bonded to the innermost layer of the exterior film 50. In another example, the portion of the barrier film 100 extending from the outer contour of the exposed surfaces 61Y and 62Y may be folded and bonded to the outermost layer of the exterior film 50 by, for example, an adhesive.

[0076] When the power storage device 10 is a lithium-ion battery, due to the volatilization of the organic solvent as the electrolyte and the decomposition of the electrolyte, gases such as volatile organic solvents, carbon monoxide, carbon dioxide, methane, ethane, hydrogen, and hydrogen fluoride may be generated. When the power storage device 10 is a capacitor, gas may be generated due to chemical reactions in the capacitor. When the power storage device 10 is an all-solid-state battery, the electrode body 20 may include a solid electrolyte that can generate gas. For example, when the solid electrolyte is a sulfide system, hydrogen sulfide gas may be generated. When the barrier film 100 has gas barrier properties, these gases can be prevented from leaking to the outside of the outer casing 40. When the barrier film 100 has water vapor barrier properties, moisture in the external space of the power storage device 10 can be prevented from intruding into the interior of the outer casing 40.

[0077] In the present embodiment, the second seal 80 is formed by heat-sealing the hot-melt resin layer 53 of the outer film 50 and the sealing surfaces 61X and 62X of the cover body 60. Hereinafter, the sealing strength of the hot-melt resin layer 53 of the outer film 50 and the sealing surfaces 61X and 62X of the cover body 60 is sometimes referred to as the sealing strength of the second seal 80. In addition, the sealing strength of the second seal 80 is the long side portion of the sealing surfaces 61X and 62X, that is, Figure 1 The sealing strength of the hot-melt resin layer 53 and the cover 60 in the sealing surfaces 61X and 62X extending in the LR (width) direction. The sealing strength of the second sealing portion 80 is relative to the sealing strength of the cover 60 in the LR (width) direction. Figure 1 The outer film 50 is stretched in the UD (up and down) direction and the distance of the second sealing portion 80 in the FB (depth) direction is measured. As in the present embodiment, when the cover body 60 is divided into a plurality of components including long sides and short sides, the sealing strength of the second sealing portion 80 is the sealing strength of the long side portion of the sealing surfaces 61X and 62X of the plurality of components.

[0078] From the perspective of properly maintaining the state in which the electrode body 20 is sealed by the outer body 40, the sealing strength of the second sealing portion 80 is preferably 40N / 15mm or more, more preferably 50N / 15mm or more, further preferably 60N / 15mm or more, further preferably 70N / 15mm or more, and further preferably 85N / 15mm or more. When the sealing strength of the second sealing portion 80 is 40N / 15mm or more, even if the storage device 10 is used for several years (less than 10 years), the state in which the electrode body 20 is sealed by the outer body 40 can be properly maintained. When the sealing strength of the second sealing portion 80 is 85N / 15mm or more, even if the storage device 10 is used for more than 10 years, the state in which the electrode body 20 is sealed by the outer body 40 can be properly maintained. The sealing strength of the second sealing portion 80 is preferably 150N / 15mm or less. The preferred range of the sealing strength of the second sealing portion 80 is 40 N / 15 mm to 150 N / 15 mm, 50 N / 15 mm to 150 N / 15 mm, 60 N / 15 mm to 150 N / 15 mm, 70 N / 15 mm to 150 N / 15 mm, or 85 N / 15 mm to 150 N / 15 mm.

[0079] When the cover 60 is plate-shaped, the cover 60 preferably has a certain thickness in order to suppress the deformation of the outer body 40 even when the storage device 10 is overlapped. From another point of view, when the cover 60 is plate-shaped, in order to properly heat-seal the sealing surfaces 61X and 62X of the cover 60 with the outer film 50 when forming the second sealing portion 80, the sealing surfaces 61X and 62X of the cover 60 preferably have a certain thickness. The minimum value of the thickness of the cover 60 is, for example, 1.0 mm, more preferably 3 mm, and further preferably 4 mm. The maximum value of the thickness of the cover 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 cover 60 may also be 10 mm or more. The preferred range of the thickness of the material constituting the cover 60 is 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, 4.0 mm to 7.0 mm. In the present embodiment, when the cover 60 is described as a plate, the material constituting the cover 60 does not include a film specified by the [Packaging Terms] specification of JIS (Japanese Industrial Standards). In addition, the thickness of the cover 60 may also be different depending on the location of the cover 60. In the case where the thickness of the cover 60 is different depending on the location, the thickness of the cover 60 refers to the thickness of the thickest part.

[0080] <1-2. Method for manufacturing power storage device>

[0081] Figure 5 1 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. In addition, in the present embodiment, the first step to the eighth step are names of the steps for convenience and do not mean the order of the steps.

[0082] In the first process of step S11 , the manufacturing apparatus manufactures the first member 61 and the second member 62 .

[0083] The second step of step S12 is performed after the first step. In the second step, the manufacturing apparatus bonds the adhesive film 31 to the electrode terminal 30. Alternatively, the second step may be performed before the first step.

[0084] The third process of step S13 is implemented after the first process or the second process. In the third process, the manufacturing device clamps the electrode terminal 30 using the first member 61 and the second member 62. The manufacturing device joins the first member 61 and the second member 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. After the third process is completed, the object obtained by joining the electrode terminal 30 and the cover body 60 (hereinafter referred to as "cover body unit 90") is completed. In addition, the first process to the third process are equivalent to the manufacturing method of the cover body unit 90.

[0085] The fourth process of step S14 is performed after the third process. In the fourth process, the manufacturing apparatus arranges the cover units 90 at both ends of the electrode body 20 and electrically connects the electrode terminals 30 to the electrodes of the electrode body 20 .

[0086] The fifth step of step S15 is performed after the fourth step. In the fifth step, the manufacturing apparatus winds the exterior film 50 around the electrode body 20 and the cover unit 90 .

[0087] The sixth process of step S16 is implemented after the fifth process. In the fifth process, the manufacturing device forms a first sealing portion 70 (hereinafter referred to as a "temporary first sealing portion") having an unsealed portion in a portion by heat-sealing the opposing hot-melt resin layers 53 of the outer film 50. In addition, the unsealed portion can be formed, for example, by using a sealing rod of a shape in which a portion does not contact the outer film 50. In another example, the unsealed portion can be formed by sandwiching a fluororesin film or the like between the facing surfaces (hot-melt resin layers 53) of the outer film 50. By forming the temporary first sealing portion before the second sealing portion 80, the outer film 50 can be used to hold the electrode body 20, so that the position of the electrode body 20 relative to the outer film 50 is not easily offset. Therefore, wrinkles can be suppressed when the second sealing portion 80 is formed.

[0088] The seventh step of step S17 is performed after the sixth step. In the seventh step, the manufacturing apparatus heat-seals the sealing surfaces 61X and 62X of the exterior film 50 and the lid body 60 to form the second sealed portion 80 .

[0089] The eighth process of step S18 is performed after the seventh process. In the eighth process, the manufacturing device injects the electrolyte from the unsealed portion of the temporary first sealed portion, and heat-seals the unsealed portion after evacuating the outer film 50, thereby forming the first sealed portion 70. In addition, when the power storage device 10 is an all-solid-state battery, the step of injecting the electrolyte is omitted in the eighth process.

[0090] Figure 6 This is a flowchart showing another example of the method for manufacturing the electricity storage device 10 . Figure 6The manufacturing method shown in the figure replaces Figure 5 The present invention is similar to the present invention except that the ninth step of step S21 is performed instead of the third step of step S13 shown in the figure, and the tenth step of step S22 is performed instead of the fourth step of step S14. Figure 5 The manufacturing method shown is the same.

[0091] exist Figure 6 In the example shown, in the ninth process of step S21 implemented after the first process of step S11 or the second process of step S12, the manufacturing device electrically connects the electrode terminal 30 to the electrode of the electrode body 20. In the tenth process of step S22 implemented after the ninth process, the manufacturing device clamps the electrode terminal 30 with the first member 61 and the second member 62, and joins the first member 61 and the second member 62 to the electrode terminal 30 by at least one method selected from, for example, ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding, and adhesives. Figure 6 In the illustrated example, in the tenth step, the lid 60 may cover, for example, a portion where the current collector foil of the electrode body 20 is connected to the electrode terminal 30 .

[0092] <1-3. Functions and Effects of Power Storage Devices>

[0093] According to the power storage device 10, the electrode terminal 30 is sandwiched between the divided first member 61 and the second member 62, so that the electrode terminal 30 is held by the lid 60. Therefore, the electrode terminal 30 can be appropriately arranged at a desired position.

[0094] In addition, the power storage device described in Patent Document 1 (Japanese Patent Application Publication No. 2019-153504) does not discuss the method of fixing the cover body and the electrode terminal. Therefore, the position of the electrode terminal may be offset relative to the cover body.

[0095] According to the power storage device of this embodiment, the electrode terminal 30 is bonded via the adhesive film 31 as needed by at least one method selected from ultrasonic sealing, high frequency sealing, heat sealing, hot plate welding and adhesive. Since the electrode terminal 30 and the cover body 60 are firmly bonded, the electrode terminal 30 can be properly held by the cover body 60.

[0096] [2. Second Embodiment]

[0097] The power storage device 10 of the second embodiment is different from the first embodiment in that it includes a cover 260 , and the other structures are the same as those of the first embodiment. Hereinafter, the cover 260 of the power storage device 10 of the second embodiment will be described mainly with respect to the parts that are different from the cover 60 of the first embodiment.

[0098] <2-1. Structure of the cover>

[0099] Figure 7 It is a side view of the cover body 260. The cover body 260 has a first member 261 and a second member 262. The first member 261 has a thick-walled portion 261X and a thin-walled portion 261Y. The thick-walled portion 261X has the same shape as the first member 61 of the first embodiment, and has a sealing surface 61X joined to the outer film 50. The thin-walled portion 261Y is connected to the thick-walled portion 261X and joined to the electrode terminal 30 via the adhesive film 31. The thickness HB of the thin-walled portion 261Y is thinner than the thickness HA of the thick-walled portion 261X. The recess 61B is formed in the thick-walled portion 261X and the thin-walled portion 261Y. In the present embodiment, the thin-walled portion 261Y is formed at a position close to the electrode body 20 relative to the thick-walled portion 261X. The thin-walled portion 261Y can also be formed at a position away from the electrode body 20 relative to the thick-walled portion 261X, in other words, formed on the outside.

[0100] The second member 262 has a thick-walled portion 262X and a thin-walled portion 262Y. The thick-walled portion 262X has the same shape as the second member 62 of the second embodiment, and has a sealing surface 62X joined to the outer film 50. The thin-walled portion 262Y is connected to the thick-walled portion 262X and joined to the electrode terminal 30 via the adhesive film 31. The thickness HD of the thin-walled portion 262Y is thinner than the thickness HC of the thick-walled portion 262X. The recess 62B is formed in the thick-walled portion 262X and the thin-walled portion 262Y. In the present embodiment, the thin-walled portion 262Y is formed at a position close to the electrode body 20 relative to the thick-walled portion 262X. The thin-walled portion 262Y can also be formed at a position away from the electrode body 20 relative to the thick-walled portion 262X, in other words, formed on the outside.

[0101] <2-2. Functions and Effects of Power Storage Devices>

[0102] According to the second embodiment of the power storage device 10, the cover body 260 has thin-walled portions 261Y and 262Y, so the electrode terminal 30 can be firmly joined to the thin-walled portions 261Y and 262Y by at least one method selected from, for example, ultrasonic sealing, high-frequency sealing, heat sealing, and hot plate welding.

[0103] [3. Third embodiment]

[0104] The power storage device 10 of the third embodiment is different from the first embodiment in that it includes a cover 360 , and the other structures are the same as those of the first embodiment. Hereinafter, the cover 360 of the power storage device 10 of the third embodiment will be described mainly with respect to the parts that are different from the cover 60 of the first embodiment.

[0105] <3-1. Structure of the cover>

[0106] Figure 8360 is an exploded view when the cover 360 is viewed from the front. The cover 360 includes a first member 361 and a second member 362. The first member 361 and the second member 362 include a positioning portion 370 for clamping the electrode terminal 30. The positioning portion 370 includes a convex portion 371 formed in one of the first member 361 and the second member 362, and a concave portion 372 formed in the other of the first member 361 and the second member 362, into which the convex portion 371 is inserted. In the present embodiment, the convex portion 371 is formed in the member joint portion 61A of the first member 361. In the present embodiment, the concave portion 372 is formed in the member joint portion 62A of the second member 362. The shape of the convex portion 371 can be arbitrarily selected. In the present embodiment, the convex portion 371 is a hemisphere. The shape of the convex portion 371 can be a prism, a pyramid, a cylinder, or a cone. The shape of the concave portion 372 can be arbitrarily selected as long as it is a shape into which the convex portion 371 can be inserted.

[0107] <3-2. Functions and Effects of Power Storage Devices>

[0108] According to the power storage device 10 of the third embodiment, the cover 360 has the positioning portion 370, so that the Figure 5 The third step of step S13 shown in FIG. Figure 6 The tenth process of step S22 is shown.

[0109] [4. Fourth embodiment]

[0110] The fourth embodiment of the power storage device 10 is different from the first embodiment in that it includes a cover 460, and the other structures are the same as those of the first embodiment. Hereinafter, the cover 460 of the power storage device 10 of the fourth embodiment will be described mainly with respect to the parts that are different from the cover 60 of the first embodiment.

[0111] <4-1. Structure of the cover>

[0112] Fig. 9 This is a front view of the cover body 460 in a state where the second member 462 is opened relative to the first member 461. The cover body 460 includes a first member 461, a second member 462, and a connecting portion 463 connecting the first member 461 and the second member 462. One of the first member 461 and the second member 462 is configured to be openable and closable relative to the other via the connecting portion 463. The connecting portion 463 has a function like a hinge. The connecting portion 463 connects the member joint portion 61A of the first member 461 and the member joint portion 62A of the second member 462.

[0113] <4-2. Functions and Effects of Power Storage Devices>

[0114] According to the power storage device 10 of the fourth embodiment, the cover 460 has the connecting portion 463, so the first member 461 and the second member 462 are not separated. Therefore, the cover 460 can be easily managed. In addition, by closing one of the first member 461 and the second member 462 relative to the other, the electrode terminal 30 can be clamped. The positioning of one of the first member 461 and the second member 462 relative to the other can be easily implemented, so that Figure 5 The third step of step S13 shown in FIG. Figure 6 The tenth process of step S22 is shown.

[0115] [5. Fifth embodiment]

[0116] The fifth embodiment differs from the first embodiment in that the power storage device 10 includes a cover 560 , and other structures are the same as those of the first embodiment. Hereinafter, the cover 560 included in the fifth embodiment will be described, focusing on the parts that are different from the cover 60 of the first embodiment.

[0117] <5-1. Structure of the cover>

[0118] Fig.10 It is an exploded view of the cover body 560 when viewed from the front. The cover body 560 has a first member 561, a second member 562, and a joint body 563. The first member 561 has the same shape as the first member 61. The second member 562 has the same shape as the second member 62. The joint body 563 joins the electrode terminal 30 made of metal with the first member 561 and the second member 562 made of resin. In the present embodiment, the joint body 563 can be made of any material as long as it can join the first member 561 and the second member 562 to the electrode terminal 30, and conventionally known materials can be used. The joint body 563 is preferably a resin molded body made of, for example, a polyolefin resin such as a polyethylene resin, a polypropylene resin, a cyclic polyolefin resin, or an acid-modified polyolefin resin obtained by grafting and modifying these polyolefin resins with an acid such as maleic anhydride. As Fig.10 As shown, the joint body 563 is preferably joined to the entirety of the recess 61B of the first member 561 and the entirety of the recess 62B of the second member 562. The joint body 563 may be joined to only the bottom surface 61BY in the recess 61B. The joint body 563 may be joined to only the bottom surface 62BY in the recess 62B.

[0119] <5-2. Functions and Effects of Power Storage Devices>

[0120] According to the power storage device 10 of the fifth embodiment, since the cover 560 has the bonding body 563, it is not necessary to bond the adhesive film 31 to the electrode terminal 30. Figure 5 or Figure 6The second step of step S12 shown in the figure can therefore easily manufacture the electricity storage device 10 .

[0121] [6. Sixth embodiment]

[0122] The sixth embodiment of the power storage device 10 is different from the fifth embodiment in that it includes a cover 660, and the other structures are the same as those of the fifth embodiment. The following describes the cover 660 of the sixth embodiment of the power storage device 10, focusing on the parts that are different from the cover 560 of the fifth embodiment.

[0123] <6-1. Structure of the cover>

[0124] Fig.11 660 is an exploded view when viewed from the front. The cover 660 has a first member 661, a second member 662, and a bonding body 663. The bonding body 663 bonds the electrode terminal 30 made of metal to the first member 661 and the second member 662 made of resin. In this embodiment, the bonding body 663 is, for example, the adhesive film 31 of the first embodiment. Fig.11 As shown, the joint body 663 is preferably joined to the entirety of the member joint portion 61A and the recessed portion 61B in the first member 661. Fig.11 As shown, the junction body 663 is preferably joined to the entirety of the member joint portion 62A and the recess 62B in the second member 662. The junction body 663 may be joined only to the recess 61B, or only to the bottom surface 61BY in the recess 61B. The junction body 563 may be joined only to the recess 62B, or only to the bottom surface 62BY in the recess 62B. In addition, the junction body 663 may also be a membrane. Examples of the membrane include a coating film that joins the electrode terminal 30 made of metal to the first member 661 and the second member 662 made of resin.

[0125] <6-2. Functions and Effects of Power Storage Devices>

[0126] According to the power storage device 10 of the sixth embodiment, since the cover 660 has the bonding body 663, it is not necessary to bond the adhesive film 31 to the electrode terminal 30. Figure 5 or Figure 6 The second step of step S12 shown in the figure can therefore easily manufacture the electricity storage device 10 .

[0127] [7. Seventh embodiment]

[0128] The seventh embodiment of the power storage device 10 is different from the sixth embodiment in that it includes a cover 760, and the other structures are the same as those of the sixth embodiment. The following describes the cover 760 of the seventh embodiment of the power storage device 10, focusing on the parts that are different from the cover 660 of the sixth embodiment.

[0129] <7-1. Structure of the cover>

[0130] Fig.12 760 and the electrode terminal 30. The cover 760 includes a first member 761, a second member 762, and a joint 763. The first member 761 is formed from the first member 661 (see Fig.11 ) is a rectangular parallelepiped shape without the recess 61B. The second member 762 is formed from the second member 662 (refer to Fig.11 ) is a rectangular parallelepiped shape without the recess 62B. 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 member 761 in a manner that covers the entire upper surface of the first member 761. Fig.12 In the example shown, the joint body 763 extends from both ends of the upper surface of the first member 761. The joint body 763 is joined to the lower surface in a manner that covers the entire lower surface of the second member 762. Fig.12 In the example shown, the joint body 763 extends from both ends of the lower surface of the second member 762. When a small gap is formed between the first member 761 and the second member 762 at both ends of the electrode terminal 30, the gap is preferably filled with an adhesive 764 such as a hot melt adhesive. The gap at both ends of the electrode terminal 30 may also be filled by performing at least one method selected from ultrasonic sealing, high frequency sealing, heat sealing, and hot plate welding on the first member 761 and the second member 762.

[0131] <7-2. Functions and Effects of Power Storage Devices>

[0132] According to the power storage device 10 of the seventh embodiment, since the cover 760 has the bonding body 763, it is not necessary to bond the adhesive film 31 to the electrode terminal 30. Figure 5 or Figure 6 The second step of step S12 shown in the figure can therefore easily manufacture the electricity storage device 10 .

[0133] <8. Modifications>

[0134] The above-mentioned embodiments are examples of the forms that the cover body, cover unit, power storage device, method for manufacturing a cover unit, and method for manufacturing a power storage device of the present invention can take, and are not intended to limit their forms. The cover body, cover unit, power storage device, method for manufacturing a cover unit, and method for manufacturing a power storage device of the present invention can take forms different from the forms illustrated in the embodiments. One example is a form in which a part of the structure of each embodiment is replaced, changed, or omitted, or a form in which a new structure is added to each embodiment. Several examples of modified examples of each embodiment are shown below. In addition, the above-mentioned embodiments and the following modified examples can be combined with each other as long as they are not technically contradictory.

[0135] <8-1>

[0136] In the power storage device 10 of the first embodiment, the structure of the cover 60 can be arbitrarily changed. For example, at least one of the recess 61B of the first member 61 and the recess 62B of the second member 62 in the cover 60 can be omitted. When the recess 61B of the first member 61 or the recess 62B of the second member 62 is omitted, the depth of the recess 61B or the recess 62B is preferably changed to a depth greater than the overall thickness of the electrode terminal 30. When the recess 61B of the first member 61 and the recess 62B of the second member 62 are omitted, a small gap between the first member 61 and the second member 62 is sometimes formed at both ends of the electrode terminal 30. The gap is preferably filled with an adhesive such as a hot melt adhesive, for example. The gap at both ends of the electrode terminal 30 can also be filled by performing at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, and hot plate welding on the first member 61 and the second member 62.

[0137] <8-2>

[0138] In the power storage device 10 of the second embodiment, the structure of the cover 260 can be arbitrarily changed. For example, one of the thin-walled portion 261Y and the thin-walled portion 262Y in the cover 260 may be omitted.

[0139] <8-3>

[0140] In the power storage device 10 of the second embodiment, the first member 261 and the second member 262 of the cover 260 may be integrally formed. In other words, the cover 260 may be formed of one member. According to this modification, it is preferred that a hole penetrating the cover 260 is formed instead of the recess 61B and the recess 62B. After the cover 260 is formed, the electrode terminal 30 may be inserted into the hole and joined to the cover 260 by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding and adhesive. The covers 60, 360, 460, 560, 660, 760 of the power storage device 10 of the first embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment and the seventh embodiment may also be formed of one member.

[0141] <8-4>

[0142] In the power storage device 10 of the third embodiment, the structure of the cover 360 can be arbitrarily changed. For example, the positioning portion 370 may be a pattern drawn or pasted on the first member 361 and the second member 362. Alternatively, the convex portion 371 may be formed on the member joint portion 62A of the second member 362, and the concave portion 372 may be formed on the member joint portion 61A of the first member 361.

[0143] <8-5>

[0144] In the power storage device 10 of the first embodiment, the two electrode terminals 30 may extend from one of the two covers 60. In this modification, the portion of the outer casing 40 where the other cover 60 is disposed may be sealed by a known method. For example, the portion where the other cover 60 is disposed may be sealed by a known cover composed of one member, or the other cover 60 may be omitted and the electrode body 20 may be sealed by folding the outer film 50. This modification can also be applied to the second to seventh embodiments.

[0145] <8-6>

[0146] In the power storage device 10 of the first embodiment, the outer film 50 may be a laminate (laminated film) having a hot-melt resin layer 53 on both sides of the barrier layer 52. In this modification, the first seal 70 may be formed by heat-sealing the hot-melt resin layers 53 laminated on one side or the other side relative to the barrier layer 52, or by heat-sealing the hot-melt resin layer 53 laminated on one side relative to the barrier layer 52 with the hot-melt resin layer 53 laminated on the other side. In this modification, the root 70X of the first seal 70 is located on any surface of the outer body 40. In this modification, the root 70X of the first seal 70 is preferably located near the edge 43 of the boundary between the first surface 41 and the second surface 42. In this modification, the hot-melt resin layer 53 may be bonded to the barrier layer 52, for example, via an adhesive layer 55. This modification can also be applied to the second to seventh embodiments.

[0147] <8-7>

[0148] The covers 60, 360, 460, 560, 660, 760 of the power storage device 10 of the first, third, fourth, fifth, sixth, and seventh embodiments may also have a thick wall portion and a thin wall portion, similar to the cover 260 of the power storage device 10 of the second embodiment. In addition, when the covers 60, 260, 360, 460, 560, 660, 760 have a thick wall portion and a thin wall portion, the bonding method of the thin wall portion of the cover 60 and the like and the electrode terminal 30 can be arbitrarily selected.

[0149] Description of Reference Numerals

[0150] 10: Power storage devices

[0151] 20: Electrode body

[0152] 30: Electrode terminal

[0153] 40: Exterior body

[0154] 40A: Opening

[0155] 50: Exterior film

[0156] 60: Cover

[0157] 61: First Component

[0158] 61B: concave part

[0159] 61Y: Reveal your face

[0160] 62: Second component

[0161] 62B: concave part

[0162] 62Y: Reveal your face

[0163] 90: Cover unit

[0164] 100: Barrier film

[0165] 260: Cover

[0166] 261: First Component

[0167] 261X: Thick wall part

[0168] 261Y: Thin wall part

[0169] 262: Second component

[0170] 262X: Thick wall part

[0171] 262Y: Thin wall part

[0172] 360: Cover

[0173] 361: First Component

[0174] 362: Second component

[0175] 370: Positioning Department

[0176] 371: convex part

[0177] 372: concave part

[0178] 460: Cover

[0179] 461: First Component

[0180] 462: Second component

[0181] 463: Connection

[0182] 560: Cover

[0183] 561: First Component

[0184] 562: Second component

[0185] 563: Conjugated

[0186] 660: Cover

[0187] 661: First Component

[0188] 662: Second component

[0189] 663: Conjugated

[0190] 760: Cover

[0191] 761: First Component

[0192] 762: Second component

[0193] 763: Conjugate.

Claims

1. A cover for an electric storage device, characterized in that: The power storage device includes an electrode body, an electrode terminal electrically connected to the electrode body, and an outer film wound around the electrode body in a manner having an opening. The cover is arranged at the opening. The cover body and the electrode terminal are joined by at least one method selected from ultrasonic sealing, high-frequency sealing, heat sealing, hot plate welding and adhesive.

2. The cover body according to claim 1, characterized in that: It has a thick portion joined to the exterior film and a thin portion connected to the thick portion and joined to the electrode terminal.

3. The cover according to claim 1 or 2, characterized in that: The cover body includes a first member and a second member that sandwich the electrode terminal in a manner that allows electric power to be input and output through the electrode terminal.

4. A cover unit, characterized in that: include: The cover body according to claim 1 or 2; and The electrode terminal is engaged with the cover.

5. An electric storage device, characterized in that: include: A cover as claimed in claim 1 or 2.

6. A method for manufacturing a cover unit, for manufacturing the cover unit according to claim 4, comprising: The step of bonding the cover to the electrode terminal.

7. A method for manufacturing an electric storage device, The power storage device comprises: an electrode body, an electrode terminal electrically connected to the electrode body, an outer film wound around the electrode body so as to have an opening, and a cover body arranged at the opening, The method for manufacturing the power storage device is characterized by comprising: The step of bonding the cover to the electrode terminal by at least one method selected from ultrasonic sealing, high frequency sealing, heat sealing, hot plate welding and adhesive.

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