Apparatus for manufacturing an electric storage element intermediate, apparatus for manufacturing an electric storage element, method for manufacturing an electric storage element intermediate, and method for manufacturing an electric storage element

Abstract

Provided is an apparatus and method for manufacturing an intermediate body of an electric storage element, which can bond an exterior film and a lid body in a short time. [Solution] A manufacturing apparatus manufactures an energy storage element intermediate using an electrode body unit and an exterior film 130 wrapped around the electrode body unit. The electrode body unit includes a first lid body 140A and a second lid body 140B, and an electrode body positioned between the first and second lid bodies. The energy storage element intermediate includes an exterior body 120 including the first and second lid bodies and an exterior film, and an electrode body housed in the exterior body. The manufacturing apparatus includes a joining device. The joining device joins the exterior film wrapped around the electrode body unit to the side end surfaces G1 of the first and second lid bodies so as to contact the side end surfaces. The joining device includes a joining tool that simultaneously presses the exterior film against a pair of opposing surfaces of the side end surfaces to join the pair of surfaces.

Description

[Technical Field]

[0001] The present disclosure relates to an apparatus for manufacturing an electric storage element intermediate, an apparatus for manufacturing an electric storage element, a method for manufacturing an electric storage element intermediate, and a method for manufacturing an electric storage element. [Background technology]

[0002] Patent Document 1 (JP 2022-123686 A) discloses an example of an energy storage element. The energy storage device disclosed in Patent Document 1 includes an electrode assembly, an electrolyte solution, and an exterior body that houses the electrode assembly and the electrolyte solution. The exterior body includes an exterior film that wraps the electrode assembly so as to form an opening, and a lid that closes the opening.

[0003] In the energy storage element disclosed in Patent Document 1, an energy storage element intermediate is obtained by joining an exterior film and a lid body with the electrode assembly housed in the exterior film and a lid body. It is not easy to join the exterior film and the lid body in a short time. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-123686 Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure aims to bond an exterior film and a lid body in a short time. [Means for solving the problem]

[0006] A first apparatus for manufacturing an energy storage element intermediate according to an embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device includes a joining tool that simultaneously presses the exterior film against a pair of opposing surfaces of the side end faces to join the exterior film to the pair of surfaces.

[0007] The second energy storage element intermediate manufacturing apparatus according to the embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The joining device includes a joining tool that presses the exterior film against the first surface and the fourth surface simultaneously to join the exterior film to the first surface and the fourth surface.

[0008] A third energy storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device includes a front joining tool that presses the exterior film against one of the side end faces to join the exterior film to the one face, and a rear joining tool that presses the exterior film against the one face after the front joining tool to join the exterior film to the one face.

[0009] A fourth apparatus for manufacturing an energy storage element intermediate according to an embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The joining device is A first joining tool that presses the exterior film against the first surface and joins the exterior film to the first surface; a first posterior joining tool that presses the exterior film against the first surface after the first front joining tool to join the exterior film to the first surface; A second front joining tool that presses the exterior film against the second surface to join the exterior film to the second surface; A second posterior joining tool that presses the exterior film against the second surface after the second front joining tool to join the exterior film to the second surface; A third joining tool that presses the exterior film against the third surface and joins the exterior film to the third surface; A third posterior joining tool that presses the exterior film against the third surface after the third front joining tool to join the exterior film to the third surface; A fourth joining tool that presses the exterior film against the fourth surface and joins the exterior film to the fourth surface; a fourth posterior joining device that presses the exterior film against the fourth surface after the fourth front joining device to join the exterior film to the fourth surface.

[0010] A fifth apparatus for manufacturing an energy storage element intermediate according to an embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device includes a plurality of corner joining tools that simultaneously press the exterior film against two or more corners included in the side end surface, and join the exterior film to the two or more corners.

[0011] A sixth apparatus for manufacturing an energy storage element intermediate according to an embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the bonding device includes a plurality of rotatable rollers having heated outer circumferential surfaces; The rollers simultaneously press the exterior film against the side end surfaces to bond the exterior film to the side end surfaces.

[0012] A seventh apparatus for manufacturing an energy storage element intermediate according to an embodiment of the present disclosure includes: an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, each of the first lid and the second lid includes a metal main body; The joining device is a manufacturing device including a lid heater that heats the main body portion, and a joining tool that heats the exterior film while pressing it against the side end surface.

[0013] An apparatus for manufacturing an energy storage element according to an embodiment of the present disclosure includes: any one of the first to seventh energy storage element intermediate manufacturing apparatuses according to the embodiment of the present disclosure; and an injection device for injecting an electrolyte into the electric storage element intermediate.

[0014] A first method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A manufacturing method for manufacturing an energy storage element intermediate using a first energy storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the joining tool simultaneously presses the exterior film against a pair of opposing surfaces of the side end faces, joining the exterior film to the pair of surfaces.

[0015] A second method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A method for manufacturing an energy storage element intermediate using a second energy storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the joiner presses the exterior film against the first surface and the fourth surface simultaneously to join the exterior film to the first surface and the fourth surface.

[0016] A third method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A manufacturing method for manufacturing an energy storage element intermediate using a third energy storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, The joining step includes: a step of pressing the exterior film against the one surface of the side end surface using the tip joining tool to join the exterior film to the one surface; This step is carried out after the step of joining using the front joining tool, and includes a step of using the rear joining tool to press the exterior film against the one surface and join the exterior film to the one surface.

[0017] A fourth method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A manufacturing method for manufacturing an electric storage element intermediate using a fourth electric storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, The joining step includes: A step of pressing the exterior film against the first surface using the first front joining tool to join the exterior film to the first surface; A step performed after the step of joining using the first front joining tool, wherein the first rear joining tool is used to press the exterior film against the first surface to join the exterior film to the first surface; A step of pressing the exterior film against the second surface using the second front joining tool to join the exterior film to the second surface; A step performed after the step of joining using the second front joining tool, wherein the exterior film is pressed against the second surface using the second rear joining tool to join the exterior film to the second surface; A step of pressing the exterior film against the third surface using the third end joining tool to join the exterior film to the third surface; A step performed after the step of joining using the third front joining tool, wherein the third rear joining tool is used to press the exterior film against the third surface to join the exterior film to the third surface; A step of pressing the exterior film against the fourth surface using the fourth end joining tool to join the exterior film to the fourth surface; This step is carried out after the step of joining using the fourth front joining device, and includes a step of pressing the exterior film against the fourth surface using the fourth rear joining device to join the exterior film to the fourth surface.

[0018] A fifth method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A manufacturing method for manufacturing an electric storage element intermediate using a fifth electric storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the corner connectors simultaneously press the exterior film against two or more corners included in the side end surface, joining the exterior film to the two or more corners.

[0019] A sixth method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A method for manufacturing an electric storage element intermediate using a sixth electric storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the rollers simultaneously press the exterior film against the side end surfaces to join the exterior film to the side end surfaces.

[0020] A seventh method for producing an energy storage element intermediate according to an embodiment of the present disclosure includes: A method for manufacturing an energy storage element intermediate using a seventh energy storage element intermediate manufacturing apparatus according to an embodiment of the present disclosure, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the lid heater heats the main body, and the joining tool heats the exterior film while pressing it against the side end surface.

[0021] A method for manufacturing an energy storage element according to an embodiment of the present disclosure includes: a step of producing an electric storage element intermediate by any one of the first to seventh methods for producing an electric storage element intermediate according to an embodiment of the present disclosure; and an injection device for injecting an electrolyte into the electric storage element intermediate. [Effects of the Invention]

[0022] According to the present disclosure, the exterior film and the lid can be joined together in a short time. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a diagram for explaining a manufacturing apparatus and a manufacturing method according to an embodiment, and is a perspective view showing an example of an energy storage element to be manufactured by the manufacturing apparatus and manufacturing method. [Figure 2] FIG. 2 is a perspective view showing an example of an electric storage element intermediate that can be used in manufacturing the electric storage element shown in FIG. [Figure 3A] FIG. 3A is a perspective view showing an example of an electrode unit that can be used to manufacture the energy storage element intermediate shown in FIG. [Figure 3B] FIG. 3B is a plan view of the electrode unit shown in FIG. 3A. [Figure 4A] FIG. 4A is a cross-sectional view showing an example of a layer structure of an exterior film that can be used in producing the electric storage element and electric storage element intermediate shown in FIGS. 1 and 2. FIG. [Figure 4B] FIG. 4B is a developed plan view showing an example of an exterior film that can be used in producing the energy storage element and the energy storage element intermediate shown in FIGS. 1 and 2. FIG. [Figure 5A] 5A is a perspective view showing an example of a lid that can be used in manufacturing the energy storage element and the energy storage element intermediate shown in FIG. 2. FIG. [Figure 5B] FIG. 5B is a cross-sectional view showing another example of a lid that can be used in manufacturing the energy storage element and the energy storage element intermediate shown in FIGS. 1 and 2. As shown in FIG. [Figure 5C] FIG. 5C is a plan view showing the lid shown in FIG. 5B. [Figure 5D] FIG. 5D is a cross-sectional view showing still another example of a lid that can be used in manufacturing the electric storage element and the electric storage element intermediate shown in FIGS. 1 and 2. As shown in FIG. [Figure 5E]FIG. 5E is a plan view showing the lid shown in FIG. 5D. [Figure 6] FIG. 6 is a configuration diagram showing an example of a manufacturing apparatus capable of manufacturing the electric storage element intermediate shown in FIG. [Figure 7A] FIG. 7A is a flowchart showing an example of a manufacturing method for manufacturing the electric storage element intermediate shown in FIG. [Figure 7B] FIG. 7B is a flowchart showing an example of step S2 shown in FIG. 7A. [Figure 7C] FIG. 7C is a flowchart showing another example of step S2 shown in FIG. 7A. [Figure 7D] FIG. 7D is a flowchart showing yet another example of step S2 shown in FIG. 7A. [Figure 7E] FIG. 7E is a flowchart showing yet another example of step S2 shown in FIG. 7A. [Figure 8] FIG. 8 is a diagram for explaining step S1 shown in FIG. 7A, showing an example of a fixing device of a manufacturing apparatus that can be used in step S1. [Figure 9] FIG. 9 is a diagram for explaining step S21 shown in FIG. 7B, showing an example of a winding device of a manufacturing apparatus that can be used in step S21. [Figure 10A] FIG. 10A is a diagram for explaining step S21 shown in FIG. 7B, and is a diagram showing another example of a winding device of the manufacturing apparatus that can be used in step S21. [Figure 10B] FIG. 10B is a diagram for explaining step S21 shown in FIG. 7B, showing another example of a winding device of the manufacturing apparatus that can be used in step S21. [Figure 11] FIG. 11 is a diagram for explaining step S21 shown in FIG. 7B, showing yet another example of a winding device of the manufacturing apparatus that can be used in step S21. [Figure 12A] FIG. 12A is a diagram for explaining step S221 shown in FIG. 7B, and is a diagram showing an example of a first bonding device that is a manufacturing device that can be used in step S221. [Figure 12B]FIG. 12B is a diagram for explaining step S222 shown in FIG. 7B, and is a diagram showing an example of a first bonding device that is a manufacturing device that can be used in step S222. [Figure 13A] FIG. 13A is a diagram for explaining step S222 shown in FIG. 7B, and is a diagram showing an example of a first bonding device that is a manufacturing device that can be used in step S222. [Figure 13B] FIG. 13B is a diagram for explaining step S232 shown in FIG. 7B, and is a diagram showing an example of a first bonding device that is a manufacturing device that can be used in step S232. [Figure 14] FIG. 14 is a diagram for explaining step S3 shown in FIG. 7A, and shows an example of a second bonding device that is a manufacturing device that can be used in step S3. [Figure 15] FIG. 15 is a diagram showing an example of an injection device that can be included in the manufacturing apparatus for an energy storage element. [Figure 16] Figure 16 is a diagram for explaining yet another example of a lid body that can be used in the production of the energy storage element and energy storage element intermediate shown in Figures 1 and 2, as well as yet another example of a first bonding device that is a manufacturing device that can be used in step S2 shown in Figure 7A. [Figure 17] FIG. 17 is a diagram for explaining step S22 shown in FIG. 7C, and shows an example of a first bonding device that is a manufacturing device that can be used in step S22. [Figure 18] FIG. 18 is a diagram for explaining step S23 shown in FIG. 7C, and is a diagram showing an example of a first bonding device that is a manufacturing device that can be used in step S23. [Figure 19A] FIG. 19A is a diagram for explaining step S2211 shown in FIGS. 7D and 7E, and is a diagram showing an example of a first bonding device that is a manufacturing apparatus that can be used in step S2211. [Figure 19B] FIG. 19B is a diagram for explaining step S2212 shown in FIGS. 7D and 7E, and is a diagram showing an example of a first bonding device that is a manufacturing apparatus that can be used in step S2212. [Figure 20A]FIG. 20A is a diagram for explaining step S2221 shown in FIGS. 7D and 7E, and is a diagram showing an example of a first bonding device that is a manufacturing apparatus that can be used in step S22211. [Figure 20B] FIG. 20B is a diagram for explaining step S2222 shown in FIGS. 7D and 7E, and is a diagram showing an example of a first bonding device that is a manufacturing apparatus that can be used in step S2222. [Figure 21A] FIG. 21A is a diagram showing another example of a first bonding device of the manufacturing apparatus that can be used in step S221 shown in FIG. 7B. [Figure 21B] FIG. 21B is a diagram showing another example of a first bonding device of the manufacturing apparatus that can be used in step S222 shown in FIG. 7B. [Figure 22A] FIG. 22A is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S221 shown in FIG. 7B. [Figure 22B] FIG. 22B is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S222 shown in FIG. 7B. [Figure 23] FIG. 23 is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S221 and step S222 shown in FIG. 7B. [Figure 24] FIG. 24 is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S221 and step S222 shown in FIG. 7B. [Figure 25] FIG. 25 is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S221 and step S222 shown in FIG. 7B. [Figure 26A] FIG. 26A is a diagram showing a specific example of the roller heater shown in FIGS. 21A to 25. FIG. [Figure 26B] FIG. 26B is a diagram for explaining the operation of the roller heater shown in FIG. 26A. [Figure 26C] FIG. 26C is a diagram for explaining the operation of the roller heater shown in FIG. 26A. [Figure 27A]FIG. 27A is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S221 and step S222 shown in FIG. 7B. [Figure 27B] FIG. 27B is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S221 and step S222 shown in FIG. 7B. [Figure 28] FIG. 28 is a diagram showing yet another example of the first bonding device of the manufacturing apparatus that can be used in step S2 shown in FIG. 7A. DETAILED DESCRIPTION OF THE INVENTION

[0024] One embodiment of the present disclosure is <1> ~ <33> Regarding.

[0025] <1> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device is a manufacturing apparatus including a joining tool that simultaneously presses the exterior film against a pair of opposing surfaces of the side end faces to join the exterior film to the pair of surfaces.

[0026] <2> The joining device includes another joining tool that simultaneously presses the exterior film against another pair of opposing surfaces of the side end surface to join the exterior film to the other pair of surfaces. <1> The manufacturing apparatus described in

[0027] <3> The connector presses the exterior film against the pair of surfaces and another pair of surfaces opposing the side end surfaces simultaneously, thereby joining the exterior film to the pair of surfaces and the other pair of surfaces. <1> The manufacturing apparatus described in

[0028] <4> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The joining device includes a joining tool that presses the exterior film against the first surface and the fourth surface simultaneously to join the exterior film to the first surface and the fourth surface.

[0029] <5> The joining device includes another joining tool that presses the exterior film against the second surface and the third surface simultaneously to join the exterior film to the second surface and the third surface. <4> The manufacturing apparatus described in

[0030] <6> The connector presses the exterior film against the first surface, the second surface, the third surface, and the fourth surface simultaneously to join the exterior film to the first surface, the second surface, the third surface, and the fourth surface. <4> The manufacturing apparatus described in

[0031] <7> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device is a manufacturing apparatus that includes a front joining tool that presses the exterior film against one of the side end surfaces to join the exterior film to the one surface, and a rear joining tool that presses the exterior film against the one surface after the front joining tool to join the exterior film to the one surface.

[0032] <8> The joining device includes another front joining tool that presses the exterior film against another surface of the side end surface to join the exterior film to the other surface, and another rear joining tool that presses the exterior film against the other surface after the other front joining tool to join the exterior film to the other surface. <7> The manufacturing apparatus described in

[0033] <9> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The joining device is A first joining tool that presses the exterior film against the first surface and joins the exterior film to the first surface; a first posterior joining tool that presses the exterior film against the first surface after the first front joining tool to join the exterior film to the first surface; A second front joining tool that presses the exterior film against the second surface to join the exterior film to the second surface; A second posterior joining tool that presses the exterior film against the second surface after the second front joining tool to join the exterior film to the second surface; A third joining tool that presses the exterior film against the third surface and joins the exterior film to the third surface; A third posterior joining tool that presses the exterior film against the third surface after the third front joining tool to join the exterior film to the third surface; A fourth joining tool that presses the exterior film against the fourth surface and joins the exterior film to the fourth surface; a fourth posterior joining device that presses the exterior film against the fourth surface after the fourth front joining device to join the exterior film to the fourth surface.

[0034] <10> The first and fourth end connectors simultaneously press the exterior film against the side end surface, The first rear connector and the fourth rear connector simultaneously press the exterior film against the side end surface, The second end connector and the third end connector simultaneously press the exterior film against the side end surface, The second rear connector and the third rear connector simultaneously press the exterior film against the side end surface. <9> The manufacturing apparatus described in

[0035] <11> The first connector, the second connector, the third connector, and the fourth connector simultaneously press the exterior film against the side end surface, The first rear connector, the second rear connector, the third rear connector, and the fourth rear connector simultaneously press the exterior film against the side end surface. <9> The manufacturing apparatus described in

[0036] <12> The joining device includes a plurality of corner joining tools that simultaneously press the exterior film against two or more corners included in the side end surface to join the exterior film to the two or more corners, <1> ~ <11> The manufacturing apparatus according to any one of the preceding claims.

[0037] <13> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device is a manufacturing apparatus that includes a plurality of corner joining tools that simultaneously press the exterior film against two or more corners included in the side end surface and join the exterior film to the two or more corners.

[0038] <14> the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The plurality of corner connectors simultaneously press the exterior film against two corners that are diagonally opposite to each other, thereby joining the exterior film to the two corners. <12> or <13> The manufacturing apparatus described in

[0039] <15> The plurality of corner connectors simultaneously press the exterior film against all corners included in the side end surface to join the exterior film to all of the corners. <12> ~ <14> The manufacturing apparatus according to any one of the preceding claims.

[0040] <16> the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The side end surface includes four corners, The plurality of corner connectors include four corner connectors that simultaneously press the exterior film against the four corners and join the exterior film to the four corners. <12> ~ <15> The manufacturing apparatus according to any one of the preceding claims.

[0041] <17> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the bonding device includes a plurality of rotatable rollers having heated outer circumferential surfaces; The manufacturing device wherein the plurality of rollers simultaneously press the exterior film against the side end surfaces to bond the exterior film to the side end surfaces.

[0042] <18> the plurality of rollers simultaneously press the exterior film against different surfaces of the side end surface; <17> The manufacturing apparatus described in

[0043] <19> the plurality of rollers simultaneously press the exterior film against each of the pair of opposing surfaces of the side end surface; <17> or <18> The manufacturing apparatus described in

[0044] <20> the plurality of rollers press the exterior film against the same surface of the side end surface; <17> ~ <19> The manufacturing apparatus according to any one of the preceding claims.

[0045] <21> an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode assembly housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, each of the first lid and the second lid includes a metal main body; The joining device is a manufacturing device including a lid heater that heats the main body portion, and a joining tool that heats the exterior film while pressing it against the side end surface.

[0046] <22> each of the first lid and the second lid includes a peripheral portion made of resin and positioned around the main body; the lid heater heats the main body to a temperature equal to or lower than the melting point of the peripheral portion; <21> The manufacturing apparatus described in

[0047] <23> The joining device includes a plurality of corner joining tools that simultaneously press the exterior film against two or more corners included in the side end surface and heat the exterior film. <17> ~ <22> The manufacturing apparatus according to any one of the preceding claims.

[0048] <24> <1> ~ <23> an apparatus for manufacturing an electric storage element intermediate according to any one of the preceding claims; an injection device that injects an electrolyte into the energy storage element intermediate.

[0049] <25> <1> ~ <3> , and <12> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the joining tool simultaneously presses the exterior film against a pair of opposing surfaces of the side end faces to join the exterior film to the pair of surfaces.

[0050] <26> <4> ~ <6> , and <12> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, A manufacturing method in which, in the joining step, the joining tool presses the exterior film against the first surface and the fourth surface simultaneously to join the exterior film to the first surface and the fourth surface.

[0051] <27> <7> , <8> , and <12> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, The joining step includes: a step of pressing the exterior film against the one surface of the side end surface using the tip joining tool to join the exterior film to the one surface; A manufacturing apparatus including a step performed after the step of joining using the front joining tool, in which the rear joining tool is used to press the exterior film against the one surface and join the exterior film to the one surface.

[0052] <28> <9> ~ <12> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, The joining step includes: A step of pressing the exterior film against the first surface using the first front joining tool to join the exterior film to the first surface; A step performed after the step of joining using the first front joining tool, wherein the first rear joining tool is used to press the exterior film against the first surface to join the exterior film to the first surface; A step of pressing the exterior film against the second surface using the second front joining tool to join the exterior film to the second surface; A step performed after the step of joining using the second front joining tool, wherein the exterior film is pressed against the second surface using the second rear joining tool to join the exterior film to the second surface; A step of pressing the exterior film against the third surface using the third end joining tool to join the exterior film to the third surface; A step performed after the step of joining using the third front joining tool, wherein the third rear joining tool is used to press the exterior film against the third surface to join the exterior film to the third surface; A step of pressing the exterior film against the fourth surface using the fourth end joining tool to join the exterior film to the fourth surface; A manufacturing method comprising: a step carried out after the step of joining using the fourth front joining device, in which the exterior film is pressed against the fourth surface using the fourth rear joining device to join the exterior film to the fourth surface.

[0053] <29> The step of joining using the first end connector, the step of joining using the second end connector, the step of joining using the third end connector, and the step of joining using the fourth end connector are carried out in parallel, The joining step using the first rear fastener, the joining step using the second rear fastener, the joining step using the third rear fastener, and the joining step using the fourth rear fastener are performed in parallel. <28> The manufacturing method described in

[0054] <30> <13> ~ <16> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, a plurality of corner connectors simultaneously press the exterior film against two or more corners included in the side end surface, thereby joining the exterior film to the two or more corners.

[0055] <31> <17> ~ <20> , and <23> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the rollers simultaneously press the exterior film against the side end surfaces to join the exterior film to the side end surfaces.

[0056] <32> <21> ~ <23> A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to any one of the above, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the lid heater heats the main body portion, and the joining tool heats the exterior film while pressing it against the side end surface.

[0057] <33> <25> ~ <32> a step of producing an electric storage element intermediate by the production method according to any one of the above items; and injecting an electrolyte solution into the energy storage element intermediate.

[0058] The present embodiment will be described below with reference to the drawings. In the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for ease of understanding. Configurations shown in some drawings may be omitted in other drawings. The scale and aspect ratios may differ between the drawings.

[0059] In this specification, terms that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values ​​of lengths and angles, are not limited to their strict meanings, but are interpreted to include a range within which similar functions can be expected.

[0060] In this specification, terms such as "sheet," "film," and "plate" are not distinguished from one another solely on the basis of differences in name. For example, an "exterior film" cannot be distinguished from a member called an exterior sheet solely on the basis of differences in name.

[0061] In this specification, multiple upper limit candidates and multiple lower limit candidates for a numerical range may be described in separate sentences. In this description, the numerical range may be constructed by combining any one upper limit candidate with any one lower limit candidate. As an example, consider the following description: "Parameter B may be greater than or equal to A1, greater than or equal to A2, or greater than or equal to A3. Parameter B may be less than or equal to A4, less than or equal to A5, or less than or equal to A6." In this example, the numerical range of parameter B may be greater than or equal to A1 and less than or equal to A4, greater than or equal to A1 and less than or equal to A5, greater than or equal to A1 and less than or equal to A6, greater than or equal to A2 and less than or equal to A4, greater than or equal to A2 and less than or equal to A5, greater than or equal to A2 and less than or equal to A6, greater than or equal to A3 and less than or equal to A4, greater than or equal to A3 and less than or equal to A5, or greater than or equal to A3 and less than or equal to A6.

[0062] To clarify the relationship between directions between drawings, several drawings use arrows with the same symbols to indicate a common first direction D1, second direction D2, and third direction D3. The tip of the arrow is the first side of each direction. The side opposite the tip of the arrow is the second side of each direction. An arrow pointing toward the paper in a direction perpendicular to the paper surface of the drawing is indicated by a symbol with a dot in a circle, as shown in FIG. 3B, for example. An arrow pointing toward the paper in a direction perpendicular to the paper surface of the drawing is indicated by a symbol with an x ​​in a circle, as shown in FIG. 15, for example.

[0063] The manufacturing apparatus and manufacturing method according to this embodiment are for manufacturing an energy storage element intermediate 110. An electrode body unit 111 and an exterior film 130 are used to manufacture the energy storage element intermediate 110. As shown in FIGS. 3A and 3B , the electrode body unit 111 includes an electrode body 115 and lid bodies 140A, 140B. As will be described below, the manufacturing apparatus and manufacturing method according to this embodiment are devised to bond the side end surfaces G1 of the lid bodies 140A, 140B to the exterior film 130 in a short time. The energy storage element intermediate 110 is used to manufacture an energy storage element 100. The manufacturing apparatus and manufacturing method according to this embodiment are also for manufacturing an energy storage element 100.

[0064] Hereinafter, the energy storage element 100 and the energy storage element intermediate 110 will be described with reference to specific examples shown in the drawings. Then, a manufacturing apparatus and manufacturing method for the energy storage element intermediate 110 will be described with reference to specific examples shown in the drawings.

[0065] 1 and 2 are diagrams showing specific examples of an electric storage element and an electric storage element intermediate. The illustrated electric storage element 100 and electric storage element intermediate 110 are targets of manufacture using the manufacturing apparatus and manufacturing method according to the present embodiment. FIG. 1 shows a specific example of the electric storage element 100. FIG. 2 shows a specific example of an electric storage element intermediate 110 that can be used in manufacturing the electric storage element 100 shown in FIG. 1. FIGS. 3A to 5E are diagrams showing examples of components that can be included in the electric storage element 100 and electric storage element intermediate 110 shown in FIGS. 1 and 2.

[0066] The energy storage element 100 and the energy storage element intermediate 110 include an electrode assembly 115 and an outer casing 120. The outer casing 120 is a sealed container. The electrode assembly 115 is housed in the outer casing 120. The energy storage element 100 and the energy storage element intermediate 110 may include a terminal 117. The terminal 117 is electrically connected to the electrode assembly 115. As in the illustrated example, the terminal 117 may penetrate the outer casing 120. The terminal 117 may extend from inside the housing space of the outer casing 120 to the outside. The space between the outer casing 120 and the terminal 117 that penetrates the outer casing 120 is sealed.

[0067] The electrode body 115 may be a storage element capable of storing electricity. The electrode body 115 may include positive and negative electrode plates. The positive and negative electrode plates may be stacked alternately. In the illustrated example, the positive and negative electrode plates may be stacked in the third direction D3. An insulating separator may be disposed between the positive and negative electrode plates.

[0068] The outermost layer of the electrode body 115 does not have to be a positive electrode plate or a negative electrode plate. The outermost layer of the electrode body 115 may be a protective tape or a separator. Protective tape or a separator can prevent unintended short circuits between the electrode body 115 and the outer casing 120. In the illustrated example, the outermost layer of the electrode body 115 is the layer located closest to the first side in the third direction D3 and the layer located closest to the second side in the third direction D3.

[0069] Examples of the power storage element that constitutes the electrode body 115 include a lithium ion battery, a capacitor, an all-solid-state battery, a semi-solid-state battery, a quasi-solid-state battery, a polymer battery, an all-resin battery, a lead-acid battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, a metal-air battery, and a polyvalent cation battery.

[0070] As shown in the example, the electrode body 115 may be rectangular parallelepiped. That is, the electrode body 115 may be a perfect rectangular parallelepiped, or may have a shape that can be regarded as a rectangular parallelepiped by modifying a portion of the shape of the outer surface. The electrode body 115 may also have a rectangular parallelepiped shape with chamfered corners.

[0071] The electrode body 115 may have a polygonal prism shape. That is, the electrode body 115 may be a perfect polygonal prism, or may have a shape that can be regarded as a polygonal prism by modifying a part of the shape of the outer surface. The electrode body 115 may also have a polygonal prism shape with chamfered corners.

[0072] The electrode body 115 may be cylindrical. That is, the electrode body 115 may be a perfect cylinder, or may have a shape that can be regarded as a cylinder by modifying a part of the shape of the outer surface. The electrode body 115 may also have a cylindrical shape with chamfered corners.

[0073] The terminal 117 is electrically connected to the electrode body 115. The terminal 117 may be electrically connected to a positive electrode plate or a negative electrode plate included in the electrode body. The terminal 117 may be in direct electrode contact with a positive electrode plate or a negative electrode plate included in the electrode body. The terminal 117 may be in electrode contact with a positive electrode plate or a negative electrode plate included in the electrode body via a conductive member. The terminal 117 may be a metal terminal used for inputting and outputting power to and from the electrode body 115 (e.g., charging and discharging). The terminal 117 does not have to be fixed to the electrode body 115. The terminal 117 may move relative to the electrode body 115 while maintaining electrical connection with the electrode body 115.

[0074] As in the illustrated example, the terminal 117 may penetrate the exterior body 120. The terminal 117 may protrude from the lid 140. The terminal 117 may extend from inside the storage space of the exterior body 120 to the outside. The space between the exterior body 120 and the terminal 117 penetrating the exterior body 120 is sealed.

[0075] The terminal 117 may not protrude from the exterior body 120. The terminal 117 may not protrude from the exterior film 130 or the lid body 140. The terminal 117 may not penetrate the exterior body 120 or the lid body 140. In these examples, a conductive lid body 140 may be used. The conductive lid body 140 may function as a terminal when inputting and outputting power to and from the electrode body 115 (for example, charging and discharging).

[0076] The material constituting the terminal 117 may be a metal. Examples of metal materials constituting the terminal 117 include aluminum, nickel, copper, and alloys thereof. When the electrode body 115 is a lithium ion battery, the terminal 117 electrically connected to the positive electrode may be aluminum or an aluminum alloy. When the electrode body 115 is a lithium ion battery, the terminal 117 electrically connected to the negative electrode may be copper, nickel, or an alloy thereof.

[0077] In the illustrated example, the terminals 117 of the energy storage element 100 and the energy storage element intermediate body 110 include a first terminal 117A and a second terminal 117B. The first terminal 117A and the second terminal 117B are electrically connected to the electrode body 115. The first terminal 117A and the second terminal 117B may function as terminals when charging and discharging the electrode body 115. The first terminal 117A may be electrically connected to one of the positive electrode plate and the negative electrode plate included in the electrode body 115. The second terminal 117B may be electrically connected to the other of the positive electrode plate and the negative electrode plate included in the electrode body 115. The first terminal 117A may be a positive electrode terminal and the second terminal 117B may be a negative electrode terminal. The first terminal 117A may be a negative electrode terminal and the second terminal 117B may be a positive electrode terminal.

[0078] In the illustrated example, the first terminal 117A extends from the electrode body 115 toward a first side in the first direction D1. The second terminal 117B extends from the electrode body 115 toward a second side in the first direction D1. In the illustrated example, the first terminal 117A and the second terminal 117B may have the same configuration and be arranged symmetrically.

[0079] In this specification, the term "terminal 117" may refer to both the first terminal 117A and the second terminal 117B.

[0080] The exterior body 120 is a sealed container in the state of the energy storage device 100. The exterior body 120 seals the electrode assembly 115. As in the illustrated example, the exterior body 120 includes an exterior film 130 and a lid 140. The exterior film 130 may be cylindrical and have openings K1 and K2. The exterior film 130 may wrap the electrode assembly 115 so as to have the openings K1 and K2. In a manufacturing method described below, the exterior film 130 is wound around the electrode assembly 115 to form the openings K1 and K2. The lid 140 closes the openings K1 and K2 of the cylindrical exterior film 130. A seal is formed between the lid 140 and the exterior film 130. In a manufacturing method described below, the exterior film 130 is wound around an electrode assembly unit 111 (see FIGS. 3A and 3B ) including the electrode assembly 115 and the lid 140, and is joined to the lid 140.

[0081] It is also possible to form a housing portion (recess) in the exterior film to house the electrode assembly by cold forming. However, it is not necessarily easy to form a deep housing portion by molding. If an attempt is made to make the housing portion (recess) deep, for example, to a molding depth of about 15 mm, pinholes or cracks may occur in the exterior film 130. This would reduce the performance and reliability of the energy storage element.

[0082] In the present embodiment, the electrode body 115 is wrapped in a cylindrical exterior film 130. The electrode body 115 may be wrapped by wrapping the exterior film 130 around the electrode body 115. According to this manufacturing method, the exterior film 130 can be easily accommodated in the exterior body 120 regardless of the thickness of the electrode body 115.

[0083] In order to improve the volumetric energy density of the energy storage element 100, it is preferable to reduce the dead space between the electrode body 115 and the exterior body 120. It is preferable that the exterior body 120 be in contact with the outer surface of the electrode body 115. In order to maximize the battery performance of an all-solid-state battery, it is effective to apply high pressure uniformly from the outer surface of the battery. From this perspective, it is also preferable to eliminate the space between the electrode body 115 and the exterior body 120. By wrapping the exterior film 130 around the electrode body 115, the space between the exterior body 120 and the electrode body 115 can be reduced.

[0084] The exterior film 130 may be flexible and easy to bend. The exterior film 130 may include a resin film. The exterior film 130 may be heat-sealable. Heat sealing makes it easy to seal the gap between the exterior film 130 and the lid 140.

[0085] FIG. 4A is a cross-sectional view showing an example of an exterior film 130. FIG. 4A is a cross-sectional view taken along line AA in FIG. 4B. As shown in FIG. 4A, the exterior film 130 may be a laminate. The exterior film 130 may include a base material layer L1, a barrier layer L2, and a heat-sealable resin layer L3, in this order. In this example, the base material layer L1 may be the outermost layer, and the heat-sealable resin layer L3 may be the innermost layer. The exterior film 130 may include the heat-sealable resin layer L3 in the outermost layer. The exterior film 130 may include the heat-sealable resin layer L3 in both the innermost and outermost layers. The exterior film 130 may include layers other than the base material layer L1, the barrier layer L2, and the heat-sealable resin layer L3. The exterior film 130 may not include one or more of the base material layer L1, the barrier layer L2, and the heat-sealable resin layer L3.

[0086] The base material layer L1 may impart heat resistance to the exterior film 130. The base material layer L1 may suppress the occurrence of defects such as pinholes that may occur during processing or distribution. Such a base material layer L1 may include at least one of a polyester resin layer and a polyamide resin layer. The base material layer L1 may include both a polyester resin layer and a polyamide resin layer. In the base material layer L1 including both a polyester resin layer and a polyamide resin layer, a laminate structure may be adopted in which the polyester resin layer is the first layer and constitutes the outermost layer, and the polyamide resin layer constitutes the second layer on the barrier layer L2 side.

[0087] The base layer L1 containing one or more of a polyester resin layer and a polyamide resin layer can protect the barrier layer L2 during processing of the exterior film 130. The base layer L1 containing one or more of a polyester resin layer and a polyamide resin layer can prevent breakage of the exterior film 130. The polyester resin layer may be a stretched polyester resin layer, or an unstretched polyester resin layer. The polyamide resin layer may be a stretched polyamide resin layer, or an unstretched polyamide resin layer. If the stretched polyester resin layer and the stretched polyamide resin layer are biaxially stretched, the tensile elongation of the exterior film 130 can be increased.

[0088] The stretched polyester resin layer may be a biaxially stretched polyethylene terephthalate (PET) film. The stretched polyamide resin layer may be a biaxially stretched nylon (ONy) film. The biaxially stretched polyethylene terephthalate film or biaxially stretched nylon film can improve the puncture strength and impact strength of the exterior film 130.

[0089] The thickness of the base layer L1 may be 5 μm or more and 300 μm or less, or 5 μm or more and 150 μm or less, from the viewpoint of film strength.

[0090] As shown in FIG. 4A, the barrier layer L2 may be bonded to the base layer L1 using an adhesive layer L4. The barrier layer L2 included in the exterior film 130 may be aluminum foil. Aluminum foil is excellent in terms of moisture resistance, processability such as extensibility, and cost. The aluminum foil may contain iron from the viewpoints of packaging suitability and pinhole resistance when packaging the electrode assembly 115. The iron content in the aluminum foil may be 0.5% by mass or more and 5.0% by mass or less, or 0.7% by mass or more and 2.0% by mass or less. By setting the iron content to 0.5% by mass or more, the exterior film 130 is excellent in packaging suitability, pinhole resistance, and extensibility. By setting the iron content to 5.0% by mass or less, the exterior film 130 is endowed with excellent flexibility. The barrier layer L2 may include a metal foil, a vapor-deposited film, or a resin layer having barrier properties. Examples of metal foil include aluminum alloys, stainless steel, titanium steel, steel plates, and recycled materials thereof.

[0091] The thickness of the barrier layer L2 may be 9 μm or more and 200 μm or less, or 30 μm or more and 85 μm or less, from the viewpoints of barrier properties, pinhole resistance, and packaging suitability. By making the thickness of the barrier layer L2 9 μm or more, it is possible to prevent the exterior film 130 from breaking even when tension is applied to the exterior film 130 when wrapping the exterior film 130 around the electrode unit 111. By making the thickness of the barrier layer L2 200 μm or less, it is possible to reduce an increase in the mass of the exterior film 130 and prevent a decrease in the weight energy density of the energy storage element 100.

[0092] The barrier layer L2 may include an aluminum foil and a corrosion-resistant coating. In this example, the aluminum foil may be located between the corrosion-resistant coating and the substrate layer L1. The barrier layer L2 may include the corrosion-resistant coating, aluminum foil, and the corrosion-resistant coating, in this order. The corrosion-resistant coating may form the surface of the barrier layer L2. The corrosion-resistant coating can prevent dissolution and corrosion of the barrier layer L2.

[0093] The corrosion-resistant coating is a layer that imparts corrosion resistance to the barrier layer L2. The corrosion resistance may be acid resistance or alkali resistance. The corrosion-resistant coating may be a thin film formed by performing a corrosion prevention treatment on the surface of the barrier layer L2. Examples of corrosion prevention treatments include hydrothermal conversion treatments such as boehmite treatment, chemical conversion treatments, anodizing treatments, and plating treatments such as nickel or chromium plating. The corrosion-resistant coating may be formed by applying a coating agent.

[0094] The corrosion-resistant coating may be a coating that improves the acid resistance of the barrier layer L2 (acid-resistant coating). The corrosion-resistant coating may be a coating that improves the alkali resistance of the barrier layer L2 (alkali-resistant coating). The corrosion prevention treatment for forming the corrosion-resistant coating may be one type, or two or more types may be combined. The corrosion-resistant coating may be multi-layered by combining two or more types of corrosion prevention treatment.

[0095] Hydrothermal conversion treatment and anodizing treatment dissolve the surface of the metal foil with a treatment agent to form metal compounds that have excellent corrosion resistance. These treatments can be defined as types of chemical conversion treatments.

[0096] The corrosion-resistant coating can prevent delamination between the barrier layer L2 (e.g., aluminum alloy foil) and the base layer L1 during molding of the exterior film 130. The corrosion-resistant coating can prevent dissolution and corrosion of the surface of the barrier layer L2 due to hydrogen fluoride produced by the reaction between the electrolyte and water. When the barrier layer L2 is an aluminum alloy foil, the corrosion-resistant coating can prevent dissolution and corrosion of aluminum oxide present on the surface of the barrier layer L2. The corrosion-resistant coating can improve the adhesion (wettability) of the surface of the barrier layer L2. The corrosion-resistant coating can prevent delamination between the base layer L1 and the barrier layer L2 during heat sealing. The corrosion-resistant coating can prevent delamination between the base layer L1 and the barrier layer L2 during molding.

[0097] The heat-sealable resin layer L3 may be bonded to the barrier layer L2 using an adhesive layer L5. The heat-sealable resin layer L3 provides heat-sealing properties to the exterior film 130. Examples of the heat-sealable resin layer L3 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, and 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 L3 may be 20 μm or more and 300 μm or less, or 40 μm or more and 150 μm or less, from the standpoint of sealability and strength.

[0098] The exterior film 130 may include one or more buffer layers outside the heat-sealable resin layer L3, more preferably outside the barrier layer L2. The buffer layer has a buffering function. The buffer layer may be laminated on the outside of the base layer L1. The base layer L1 may function as a buffer layer. When the exterior film 130 has multiple buffer layers, the multiple buffer layers may be laminated adjacent to each other, or may be laminated with the base layer L1, the barrier layer L2, or the like interposed therebetween.

[0099] The outer side of the exterior film 130 is the side away from the electrode body 115 when the exterior film 130 is wrapped around the electrode body 115. The inner side of the exterior film 130 is the side closer to the electrode body 115 when the exterior film 130 is wrapped around the electrode body 115.

[0100] The material constituting the buffer layer can be arbitrarily selected from materials having cushioning properties. Examples of materials having cushioning properties include rubber, nonwoven fabric, and foam sheet. The rubber may be, for example, natural rubber, fluororubber, or silicone rubber. The rubber hardness may be 20 or more and 90 or less. The material constituting the nonwoven fabric may be a material having excellent heat resistance. The thickness of the buffer layer made of nonwoven fabric may be 100 μm or more, 200 μm or more, or 1000 μm or more. The thickness of the buffer layer made of nonwoven fabric may be 5000 μm or less, or 3000 μm or less. The thickness of the buffer layer may be 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 thickness of the buffer layer may particularly be 1000 μm to 3000 μm.

[0101] The thickness of the buffer layer made of rubber may be 0.5 mm or more. The thickness of the buffer layer made of rubber may be 10 mm or less, 5 mm or less, or 2 mm or less. The thickness of the buffer layer made of rubber may be 0.5 mm or more and 10 mm or less, 0.5 mm or more and 5 mm or less, or 0.5 mm or more and 2 mm or less.

[0102] The buffer layer included in the exterior film 130 can function as a cushion. The buffer layer included in the exterior film 130 can prevent the exterior film 130 from being damaged due to an impact when the energy storage device 100 is dropped, or due to contact or collision during handling of the energy storage device 100, such as during manufacturing.

[0103] The lid 140 and the exterior film 130 form the exterior body 120. In the energy storage device 100, the lid 140 closes the openings K1 and K2 of the cylindrical exterior film 130. The space between the lid 140 and the exterior film 130 is sealed.

[0104] The lid 140 may be connected to the terminal 117. The lid 140 may hold the terminal 117. As described above, the terminal 117 is electrically connected to the electrode assembly 115. The lid 140 may be coupled to the electrode assembly 115 by the terminal 117. The terminal 117 may move somewhat relative to the electrode assembly 115. Therefore, the lid 140 may move somewhat relative to the electrode assembly 115.

[0105] The lid body 140 is wrapped around the exterior film 130 that encases the electrode body 115. The lid body 140 is joined to the exterior film 130. The lid body 140 and the exterior film 130 may be joined by heat sealing. The lid body 140 may be joined to the heat-fusible resin layer L3 of the exterior film 130 by heat sealing. The lid body 140 may be joined in a circumferential region. The lid body 140 and the exterior film 130 may be joined at a circumferential seal portion. The space between the lid body 140 and the exterior film 130 is sealed.

[0106] The lid 140 and the terminal 117 constitute a lid unit 113. The lid unit 113 and the electrode 115 constitute an electrode unit 111. In the manufacturing apparatus and manufacturing method according to the present embodiment, the electrode unit 111 and the exterior film 130 are used to manufacture the energy storage element 100 and the energy storage element intermediate 110.

[0107] In the illustrated example, the lid body 140 of the energy storage element 100 and the energy storage element intermediate body 110 includes a first lid body 140A and a second lid body 140B. In the illustrated example, the first lid body 140A holds the first terminal 117A, and the second lid body 140B holds the second terminal 117B.

[0108] In the illustrated example, the first cover 140A and the second cover 140B face each other in the first direction D1. The first cover 140A, the electrode assembly 115, and the second cover 140B are positioned in this order in the first direction D1. The first cover 140A is positioned on a first side of the electrode assembly 115 in the first direction D1. The second cover 140B is positioned on a second side of the electrode assembly 115 in the first direction D1. As in the illustrated example, the first cover 140A and the second cover 140B may have the same configuration and be arranged symmetrically. The first cover 140A and the second cover 140B may have different configurations. The first cover 140A and the second cover 140B may have different shapes.

[0109] The first lid body 140A and the first terminal 117A constitute a first lid body unit 113A. The second lid body 140B and the second terminal 117B constitute a second lid body unit 113B. The first lid body unit 113A extends from the electrode body 115 toward a first side in the first direction D1. The second lid body unit 113B extends from the electrode body 115 toward a second side in the first direction D1. As in the illustrated example, the first lid body unit 113A and the second lid body unit 113B may have the same configuration and be arranged symmetrically. The first lid body unit 113A and the second lid body unit 113B may have different configurations. The first lid body unit 113A and the second lid body unit 113B may have different shapes.

[0110] In this specification, the term "lid 140" may refer to both the first lid 140A and the second lid 140B. The term "lid unit 113" may refer to both the first lid unit 113A and the second lid unit 113B.

[0111] 5A, the lid 140 may be a rectangular parallelepiped. That is, the lid 140 may be a perfect rectangular parallelepiped, or may have a shape that can be regarded as a rectangular parallelepiped by modifying a portion of the shape of the outer surface. The lid 140 may also have a rectangular parallelepiped shape with chamfered corners.

[0112] 16, the lid 140 may have a polygonal prism shape. That is, the lid 140 may be a perfect polygonal prism, or may have a shape that can be regarded as a polygonal prism by modifying a part of the shape of the outer surface. The lid 140 may have a polygonal prism shape with chamfered corners.

[0113] The lid 140 may be cylindrical. That is, the lid 140 may be a perfect cylinder, or may have a shape that can be regarded as a cylinder by modifying a portion of the shape of the outer surface. The lid 140 may also have a cylindrical shape with chamfered corners.

[0114] 5A, the lid 140 may include a peripheral side edge surface G1. The lid 140 may be joined to the exterior film 130 at the peripheral side edge surface G1. The lid 140 may be welded to the exterior film 130 at the peripheral side edge surface G1. The lid 140 may be heat-sealed to the exterior film 130 at the peripheral side edge surface G1. The lid 140 may be heat-sealed to the heat-fusible resin layer L3 of the exterior film 130 at the peripheral side edge surface G1.

[0115] The side end surface G1 of the lid 140 may include a plurality of surfaces G11 to G14. A corner G1X may be formed between two adjacent surfaces. The circumferential side end surface G1 may be a bent surface.

[0116] As shown in FIG. 5A, the cover 140 may include an outer main surface G2 and an inner main surface G3 as a pair of main surfaces. The outer main surface G2 faces outward in the first direction D1. The inner main surface G3 faces inward in the first direction D1. The inner main surface G3 faces the internal space of the tubular exterior film 130. The inner main surface G3 faces the electrode assembly 115 in the first direction D1. The outer side in the first direction D1 is the side away from the center of gravity of the electrode assembly 115 in the first direction D1. The inner side in the first direction D1 is the side closer to the center of gravity of the electrode assembly 115 in the first direction D1. The inner main surface G3 faces the electrode assembly 115 in the first direction D1.

[0117] In the example shown in FIG. 5A, the lid 140 includes a side end surface G1 located between the outer main surface G2 and the inner main surface G3. The side end surface G1 connects the outer main surface G2 and the inner main surface G3. The side end surface G1 faces the tubular exterior film 130. The side end surface G1 is joined to the exterior film 130. The side end surface G1 may be welded to the heat-fusible resin layer L3 of the exterior film 130. The side end surface G1 may be heat-sealed to the heat-fusible resin layer L3 of the exterior film 130. The side end surface G1 of the lid 140 shown in FIG. 5A includes a first surface G11, a second surface G12, a third surface G13, and a fourth surface G14.

[0118] The first surface G11 and the fourth surface G14 extend in the second direction D2. The first surface G11 and the fourth surface G14 are parallel to each other. The second surface G12 and the third surface G13 extend in the third direction D3. The second surface G12 and the third surface G13 are parallel to each other.

[0119] In the illustrated example, the first surface G11 and the fourth surface G14 are parallel to the first direction D1. In the illustrated example, the first surface G11 and the fourth surface G14 are perpendicular to the third direction D3. In the illustrated example, the second surface G12 and the third surface G13 are parallel to the first direction D1. In the illustrated example, the second surface G12 and the third surface G13 are perpendicular to the second direction D2.

[0120] The second surface G12 is located between the first surface G11 and the fourth surface G14. The second surface G12 connects the first surface G11 and the fourth surface G14. The third surface G13 is located between the first surface G11 and the fourth surface G14. The third surface G13 connects the first surface G11 and the fourth surface G14.

[0121] As described above, the first direction D1 is the direction in which the first cover 140A, the electrode assembly 115, and the second cover 140B are arranged. The second direction D2 is non-parallel to the first direction D1. The third direction D3 is non-parallel to both the first direction D1 and the second direction D2. In the illustrated example, the second direction D2 is perpendicular to the first direction D1. In the illustrated example, the third direction D3 is perpendicular to both the first direction D1 and the second direction D2.

[0122] The side end surface G1 of the illustrated lid body 140 includes a corner G1X. The side end surface G1 includes a first surface G11 to a fourth surface G14, and the corner G1X is formed between any two adjacent surfaces among the first surface G11 to the fourth surface G14. That is, the side end surface G1 of the lid body 140 includes four corners G1X. The corner G1X is formed between the first surface G11 and the second surface G12. The corner G1X is formed between the second surface G12 and the fourth surface G14. The corner G1X is formed between the third surface G13 and the fourth surface G14. The corner G1X is formed between the third surface G13 and the first surface G11. The corner G1X may be chamfered to have a rounded shape.

[0123] A lower limit may be set for the thickness of the lid body 140, i.e., the length of the lid body 140 along the first direction D1. Setting a lower limit for the thickness of the lid body 140 makes it possible to suppress deformation of the exterior body 120 when the energy storage devices 100 are stacked. Therefore, the energy storage devices 100 can be stacked stably. Furthermore, setting a lower limit for the thickness of the lid body 140 makes it possible to stably seal the gap between the exterior film 130 and the side end surface G1 of the lid body 140. In other words, the exterior body 120 can be stably sealed. The thickness of the lid body 140 may be 1.0 mm or more, 3.0 mm or more, or 4.0 mm or more.

[0124] An upper limit may be set for the thickness of the lid 140. The thickness of the lid 140 may be 10 mm or less, 8.0 mm or less, or 7.0 mm or less.

[0125] The thickness of the lid 140 may be 1.0 mm or more and 10 mm or less, 1.0 mm or more and 8.0 mm or less, 1.0 mm or more and 7.0 mm or less, 3.0 mm or more and 10 mm or less, 3.0 mm or more and 8.0 mm or less, 3.0 mm or more and 7.0 mm or less, 4.0 mm or more and 10 mm or less, 4.0 mm or more and 8.0 mm or less, or 4.0 mm or more and 7.0 mm or less.

[0126] Films defined by the JIS (Japanese Industrial Standards) [Packaging Terminology] standard do not fall under the category of rectangular parallelepiped lid body 140. The thickness of lid body 140 may vary depending on the part of lid body 140. When the thickness of lid body 140 varies depending on the part, the thickness of lid body 140 shall be the thickness of the thickest part.

[0127] The lid 140 may be a resin molded product. The lid 140 may be a metal molded product. The lid 140 may be conductive. The material constituting the lid 140 may include one or more of a resin, a metal, a metal oxide, a carbon material, and a rubber material. The material constituting the lid 140 may include a metal oxide, a carbon material, and a rubber material.

[0128] The resin molded article means an article produced by molding processes such as injection molding and extrusion molding.

[0129] Examples of the resin material contained in the lid 140 include polyester resins such as polyethylene terephthalate resins and polybutylene terephthalate resins. Examples of the resin material contained in the lid 140 include polyolefin resins or cyclic polyolefin resins such as polyethylene resins, fluorine resins, and polypropylene resins, as well as acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride.

[0130] When the lid 140 and the exterior film 130 are heat-sealed, the main component contained in the lid 140 may be the same as the main component contained in the heat-sealable resin layer L3 of the exterior film 130. Examples of the main component of the lid 140 and the main component of the heat-sealable resin layer L3 include polyolefin resins such as polyethylene resins and polypropylene resins, and acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. The main component of a certain element is a material that accounts for 50% or more by mass of the materials contained in that element.

[0131] 5A, the lid 140 may include a through hole 141. The through hole 141 extends between the outer main surface G2 and the inner main surface G3. The terminal 117 passes through the through hole 141. The gap between the terminal 117 and the lid 140 is sealed. A sealant may be embedded in the through hole 141 between the terminal 117 and the lid 140.

[0132] The terminal 117 may include a conductive core material and an adhesive member wrapped around the core material. The adhesive member is a member with adhesive strength. The adhesive member may be a film, a rectangular parallelepiped, or a frame-like frame. The adhesive member can improve the airtightness of the exterior body 120. In particular, it can stably seal the gap between the metal core material and the resin lid body 140. Examples of materials for the adhesive member include polyethylene resins such as polyethylene terephthalate resins and polybutylene terephthalate resins, polyolefin resins such as polypropylene resins, and cyclic polyolefin resins, as well as acid-modified polyolefin resins obtained by graft-modifying these polyolefin resins with an acid such as maleic anhydride. The adhesive film may include one or more of the above-mentioned films.

[0133] There are no particular limitations on the position at which terminal 117 protrudes from exterior body 120. The position of through-hole 141 can be changed from the example shown in the drawing.

[0134] Terminal 117 may pass between exterior film 130 and lid 140. In this example, a seal is formed between terminal 117 and exterior film 130, and a seal is formed between terminal 117 and side end surface G1 of lid 140. In this example, through-hole 141 does not have to be formed in lid 140.

[0135] The terminal 117 and the lid 140 may be integrally formed, or the terminal 117 and the lid 140 may be formed seamlessly.

[0136] In the manufacturing apparatus and manufacturing method described below, the energy storage element 100 and the energy storage element intermediate 110 are manufactured using an electrode body unit 111 and an exterior film 130. The exterior film 130 is wound around the electrode body unit 111. The exterior film 130 is wound around the electrode body unit 111 so as to contact the side end surfaces G1 of the first lid body 140A and the second lid body 140B. By winding the exterior film 130 around the electrode body unit 111, a first opening K1 and a second opening K2 are formed. The first lid body 140A is located within the first opening K1. The side end surface G1 of the first lid body 140A can contact the inner surface of the exterior film 130. The second lid body 140B is located within the second opening K2. The side end surface G1 of the second lid body 140B can contact the inner surface of the exterior film 130.

[0137] As shown by the solid lines in FIG. 4B, the exterior film 130 included in the energy storage device 100 may have a rectangular shape in an unfolded state. The exterior film 130 shown in FIG. 4B includes a pair of side edges A1, A2 and a pair of ends B1, B2. The pair of side edges A1, A2 include a first side edge A1 and a second side edge A2. The first opening K1 is formed by the first side edge A1. The side end surface G1 of the first lid body 140A faces the first side edge A1. The second opening K2 is formed by the second side edge A2. The side end surface G1 of the second lid body 140B faces the second side edge A2.

[0138] The gap between the exterior film 130 and the lid 140 is sealed. The side edge surface G1 of the lid 140 and the exterior film 130 are joined. The side edge surface G1 of the lid 140 and the exterior film 130 may be welded. In an example described below, the side edge surface G1 of the lid 140 and the exterior film 130 are heat-sealed. A joint, for example, an opening seal portion S1, is formed between the side edge surface G1 and the exterior film 130. The opening seal portion S1 may be a portion where the heat-fusible resin layer L3 of the exterior film 130 is welded to the side edge surface G1.

[0139] 1, the side end surface G1 of the first lid body 140A is joined to the first side edge portion A1 of the exterior film 130. The side end surface G1 of the second lid body 140B is joined to the second side edge portion A2 of the exterior film 130.

[0140] The opening seal portion S1 includes a first seal portion S11, a second seal portion S12, a third seal portion S13, and a fourth seal portion S14. The first seal portion S11 is formed between a first surface G11 of the side end surface G1 and the exterior film 130. The second seal portion S12 is formed between a second surface G12 of the side end surface G1 and the exterior film 130. The third seal portion S13 is formed between a third surface G13 of the side end surface G1 and the exterior film 130. The fourth seal portion S14 is formed between a fourth surface G14 of the side end surface G1 and the exterior film 130.

[0141] A lower limit may be set for the seal strength of the opening seal portion S1. Setting a lower limit for the seal strength of the opening seal portion S1 ensures stable airtightness of the exterior body 120. The seal strength of the opening seal portion S1 may be 40 N / 15 mm or more, 50 N / 15 mm or more, 60 N / 15 mm or more, 70 N / 15 mm or more, or 85 N / 15 mm or more.

[0142] By setting the seal strength of the opening seal portion S1 to 40 N / 15 mm or more, the exterior body 120 can stably maintain the sealing of the electrode assembly 115 over several years (less than 10 years) of use of the energy storage device 100. By setting the seal strength of the opening seal portion S1 to 85 N / 15 mm or more, the exterior body 120 can stably maintain the sealing of the electrode assembly 115 over 10 years of use of the energy storage device 100.

[0143] The seal strength of the opening seal portion S1 may be 200N / 15mm or less, or 150N / 15mm or less.

[0144] The seal strength of the opening seal portion S1 may be 40N / 15mm or more and 200N / 15mm or less, 50N / 15mm or more and 200N / 15mm or less, 60N / 15mm or more and 200N / 15mm or less, 70N / 15mm or more and 200N / 15mm or less, or 85N / 15mm or more and 200N / 15mm or less. The seal strength of the opening seal portion S1 may be 40N / 15mm or more and 150N / 15mm or less, 50N / 15mm or more and 150N / 15mm or less, 60N / 15mm or more and 150N / 15mm or less, 70N / 15mm or more and 150N / 15mm or less, or 85N / 15mm or more and 150N / 15mm or less.

[0145] The seal strength of the opening seal portion S1 is the seal strength measured on the longest flat surface of the side end face G1. The seal strength is the peel adhesion strength (N / 15 mm) measured in accordance with the 90-degree peel test specified in JIS K6854-1:1999.

[0146] The illustrated exterior film 130 includes a first portion 131A, a second portion 131B, a third portion 131C, and a fourth portion 131D.

[0147] The first portion 131A includes a portion that is joined to the first surface G11 of the first lid body 140A and the first surface G11 of the second lid body 140B. In the exterior body 120, the first portion 131A extends between the first surface G11 of the first lid body 140A and the first surface G11 of the second lid body 140B.

[0148] The second portion 131B includes a portion that is joined to the second surface G12 of the first lid body 140A and the second surface G12 of the second lid body 140B. In the exterior body 120, the second portion 131B extends between the second surface G12 of the first lid body 140A and the second surface G12 of the second lid body 140B.

[0149] The third portion 131C includes a portion that is joined to the third surface G13 of the first lid body 140A and the third surface G13 of the second lid body 140B. In the exterior body 120, the third portion 131C extends between the third surface G13 of the first lid body 140A and the third surface G13 of the second lid body 140B.

[0150] The fourth portion 131D includes a portion that is joined to the fourth surface G14 of the first cover 140A and the fourth surface G14 of the second cover 140B. In the exterior body 120, the fourth portion 131D extends between the fourth surface G14 of the first cover 140A and the fourth surface G14 of the second cover 140B.

[0151] The illustrated exterior film 130 further includes a first extending portion 132A and a second extending portion 132B extending from the electrode body 115 when wrapped around the electrode body 115. The first extending portion 132A is connected to the second portion 131B. The second extending portion 132B is connected to the fourth portion 131D. As shown in FIG. 4B , the first extending portion 132A includes a first end B1 of the exterior film 130 included in the energy storage element 100. The second extending portion 132B includes a second end B2 of the exterior film 130 included in the energy storage element 100.

[0152] In the energy storage device 100, the gap between the first extending portion 132A and the second extending portion 132B of the exterior film 130 is sealed. The first extending portion 132A and the second extending portion 132B are joined. The first extending portion 132A and the second extending portion 132B may be welded together. In an example described below, the first extending portion 132A and the second extending portion 132B are heat-sealed together. A joint, for example, an extended seal portion S2, is formed between the first extending portion 132A and the second extending portion 132B. The extended seal portion S2 may be a portion where the heat-fusible resin layers L3 of the exterior film 130 are fused together. In the illustrated energy storage device 100, the exterior body 120 is sealed by the opening seal portion S1 and the extended seal portion S2.

[0153] The extending seal portion S2 may extend in the longitudinal direction of the energy storage element 100 and the electrode body unit 111. The extending seal portion S2 may extend in the second direction D2. The extending seal portion S2 may extend in a direction connecting the pair of openings K1, K2. The extending seal portion S2 may extend in the first direction D1. In the example shown in FIG. 15, two extending seal portions S2 are provided at positions spaced apart in the first direction D1. In the example shown in FIG. 15, each extending seal portion S2 is L-shaped. In the example shown, each extending seal portion S2 extends in both the first direction D1 and the second direction D2.

[0154] The extending seal portion S2 may be linear, unlike the illustrated example. The extending seal portion S2 may be I-shaped. The extending seal portion S2 may extend in either the first direction D1 or the second direction D2.

[0155] The position where the extended seal portion S2 is formed in the exterior body 120 can be selected arbitrarily. In the illustrated example, the extended seal portion S2 extends to the connection end that connects to the second portion 131B of the first extending portion 132A. The extended seal portion S2 connects to the second seal portion S12. In the illustrated example, the extended seal portion S2 extends to the connection end that connects to the fourth portion 131D of the second extending portion 132B. The extended seal portion S2 connects to the fourth seal portion S14.

[0156] 1, the pair of extending portions 132A, 132B may be located outside the cylindrical portion formed by the first portion 131A to the fourth portion 131D. The pair of extending portions 132A, 132B may be disposed on the second portion 131B. The pair of extending portions 132A, 132B may be disposed on the fourth portion 131D. The pair of extending portions 132A, 132B may be located inside the cylindrical portion formed by the first portion 131A to the fourth portion 131D.

[0157] In the manufacturing apparatus and manufacturing method described below, an energy storage element intermediate 110 is manufactured using an electrode unit 111 and an exterior film 130. As shown in FIG. 2, in the energy storage element intermediate 110, the extended seal portion S2 includes an unsealed portion S2X at least in part. In the illustrated example, the unsealed portion S2X is located between the pair of extended seal portions S2 in the first direction D1. In the energy storage element intermediate 110, the extended seal portion S2 may not be formed at all. The energy storage element intermediate 110 is not sealed. The energy storage element intermediate 110 is open between the pair of extending portions 132A, 132B.

[0158] An electrolyte solution is poured into the energy storage element intermediate 110 through the open portion. The pair of extending portions 132A, 132B of the energy storage element intermediate 110 into which the electrolyte solution has been poured are joined over the entire length along the first direction D1 to obtain the energy storage element 100.

[0159] The temporary energy storage element may be manufactured by sealing the energy storage element intermediate 110 into which the electrolytic solution has been injected. Electricity may be passed through the temporary energy storage element. Next, the exterior body 120 of the temporary energy storage element may be opened, and gas generated by the passage of electricity may be discharged from the exterior body 120. After that, the exterior body 120 may be sealed again, thereby manufacturing the energy storage element 100.

[0160] The pair of extending portions 132A, 132B of the energy storage element intermediate 110 may be partially removed. The pair of extending portions 132A, 132B extending a long distance from the electrode unit 111 is easy to process, such as joining. As shown in FIG. 2, the extension length of the pair of extending portions 132A, 132B from the electrode unit 111 may be longer in the pair of extending portions 132A, 132B included in the energy storage element intermediate 110 than in the pair of extending portions 132A, 132B included in the energy storage element 100. As an example, the two-dot chain line shown in FIG. 4B indicates the outline of the exterior film 130 included in the energy storage element intermediate 110.

[0161] Note that the first direction D1, second direction D2, and third direction D3 shown in the drawings are directions based on the electrode unit 111. For example, in the drawings for explaining the manufacturing apparatus and manufacturing method, the second portion 131B, third portion 131C, fourth portion 131D, first extending portion 132A, and second extending portion 132B included in the exterior film 130 have their positions changed with respect to the first direction D1, second direction D2, and third direction D3.

[0162] As shown in FIGS. 5B to 5E, the lid body 140 may include a metal main body portion 140x. In the example shown in FIGS. 5B to 5E, the lid body 140 includes the main body portion 140x and a resin peripheral portion 140y. When observed from the first direction D1, the peripheral portion 140y is located around the main body portion 140x. When observed from the first direction D1, the main body portion 140x is surrounded by the peripheral portion 140y. The peripheral portion 140y may form a side end surface G1 of the lid body 140 that is joined to the exterior film 130. A lid body 140 including the main body portion 140x and the peripheral portion 140y makes it easier to improve the seal strength between the lid body 140 and the exterior film 130, ensure the strength of the lid body 140, and ensure a path for inputting and outputting power to and from the electrode body 115.

[0163] The main body 140x may be electrically conductive. The main body 140x may be electrically connected to the terminal 117 and function as a terminal when inputting and outputting power to and from the electrode body 115 (for example, charging and discharging). The main body 140x may be made of aluminum or an aluminum alloy.

[0164] The surrounding portion 140y may be non-conductive and may contribute to improving the sealing strength between the lid 140 and the exterior film 130.

[0165] As shown in FIGS. 5B and 5C, the adhesive member surrounding portion 140y may be in the form of a film. The adhesive member surrounding portion 140y may be a resin film disposed on main body portion 140x. The resin film may be a single layer or may include multiple layers. As shown in FIGS. 5D and 5E, the adhesive member surrounding portion 140y may be in the form of a frame. The adhesive member surrounding portion 140y may be a resin molded product.

[0166] The space between the main body portion 140x and the peripheral portion 140y is sealed. The main body portion 140x and the peripheral portion 140y may be joined by welding, fixing, or brazing. Welding may be heat sealing, ultrasonic bonding, high frequency bonding, welding, or the like. The peripheral portion 140y, which is a resin molded product, may be joined to the main body portion 140x by in-mold molding. Examples of brazing include bonding using an adhesive or solder. Examples of fastening include physical bonding such as fitting, caulking, or bonding using a connector such as a screw.

[0167] From the viewpoint of improving the seal strength between the lid body 140 and the exterior film 130, the material of the peripheral portion 140y may be set as follows. The peripheral portion 140y may function as an adhesive member. The adhesive member is a member having adhesive force. The peripheral portion 140y as an adhesive member may function as an adhesive member that improves the seal strength between the lid body 140 (main body portion 140x) and the exterior film 130.

[0168] The adhesive member surrounding portion 140y may contain a resin containing a polyolefin skeleton as a main component. The adhesive member surrounding portion 140y may contain a polyolefin as a main component. The adhesive member surrounding portion 140y may contain a polypropylene as a main component. The polyolefin may be one or more polyolefins selected from linear polyolefins and cyclic polyolefins.

[0169] The polyolefin used in the peripheral portion 140y as the adhesive member may be an acid-modified polyolefin. An acid-modified polyolefin is a polymer modified by block polymerization or graft polymerization of a polyolefin with an acid component. Examples of acid-modified polyolefins include the above-mentioned polyolefins, copolymers of the above-mentioned polyolefins with polar molecules such as acrylic acid or methacrylic acid, and polymers such as cross-linked polyolefins. Examples of acid components used for acid modification include carboxylic acids such as maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, and itaconic anhydride, or anhydrides of these carboxylic acids.

[0170] The above-mentioned material used for the adhesive member of the peripheral portion 140y may be used for the portion that comes into contact with the metallic main body portion 140x.The above-mentioned material used for the adhesive member of the peripheral portion 140y may be used for the portion that comes into contact with the exterior film 130.

[0171] The material used for the adhesive peripheral portion 140y may also be used for the portion of the lid 140 (e.g., the main body 140x) that forms the through-hole 141 or the portion that comes into contact with the terminal 117. The material used for the adhesive peripheral portion 140y described here may also be used for the portion of the terminal 117 that comes into contact with the lid 140.

[0172] Next, a description will be given of a manufacturing apparatus 20 and a manufacturing method for manufacturing the energy storage element intermediate 110. The energy storage element 100 can be manufactured using the energy storage element intermediate 110. Therefore, the manufacturing apparatus 10 for manufacturing the energy storage element 100 may include a manufacturing apparatus 20 for manufacturing the energy storage element intermediate 110. The manufacturing method for manufacturing the energy storage element 100 may include a manufacturing method for manufacturing the energy storage element intermediate 110.

[0173] The manufacturing apparatus 20 manufactures an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130. The manufacturing apparatus 20 includes a first joining device 70. The first joining device 70 joins the exterior film 130, which is wrapped around the electrode body unit 111, to the side end surfaces G1 of the first lid body 140A and the second lid body 140B so as to come into contact with the side end surfaces G1. As shown in FIG. 6 , the manufacturing apparatus 20 may include one or more of a fixing device 40, a winding device 50, and a second joining device 90.

[0174] The fixing device 40 fixes the first lid body 140A and the second lid body 140B. The winding device 50 winds the exterior film 130 around the electrode body unit 111. The second joining device 90 joins the pair of extension portions 132A, 132B to each other.

[0175] A manufacturing method for manufacturing an energy storage element intermediate 110 uses an electrode body unit 111 and an exterior film 130 to manufacture the energy storage element intermediate 110. The manufacturing method includes a first bonding step S2. In the first bonding step S2, the exterior film 130, which is wrapped around the electrode body unit 111 so as to contact the side end surfaces G1 of the first cover body 140 and the second cover body 140B, is bonded to the side end surfaces G1. As shown in FIG. 7A , the manufacturing method may include a fixing step S1 and a second bonding step S3.

[0176] Although not shown in FIG. 7A , the manufacturing method may include a step of supplying the electrode body units 111. In the step of supplying the electrode body units 111, the electrode body units 111 may be prepared in advance and supplied. In the step of supplying the electrode body units 111, the electrode body units 111 may be manufactured and supplied sequentially. The supply of the electrode body units 111 may be performed by a supply device included in the manufacturing apparatus 20. The supply of the electrode body units 111 may also be performed by an operator manually bringing the electrode body units 111 into the manufacturing apparatus 20.

[0177] 7A, the manufacturing method may include a step of supplying an exterior film 130. In the step of supplying the exterior film 130, a pre-prepared exterior film 130 may be supplied. In the step of supplying the exterior film 130, the exterior films 130 may be manufactured and supplied sequentially. In the step of supplying the exterior film 130, the exterior film 130 used to manufacture one energy storage element intermediate 110 may be cut out from a long exterior film.

[0178] Each step of the manufacturing method shown in FIG. 7A will be described together with the components of the manufacturing apparatus 20 used in each step.

[0179] In the following description, the electrode body unit 111 used in the energy storage element intermediate body 110 includes an electrode body 115, a first terminal 117A, a second terminal 117B, a first cover body 140A, and a second cover body 140B. The electrode body 115 is located between the first cover body 140A and the second cover body 140B. The first terminal 117A is electrically connected to the electrode body 115. The first cover body 140A is connected to the first terminal 117A. The second terminal 117B is electrically connected to the electrode body 115. The second cover body 140B is connected to the second terminal 117B.

[0180] The first terminal 117A is separate from the first lid body 140A and is held by the first lid body 140A. The second terminal 117B is separate from the second lid body 140B and is held by the second lid body 140B. The first lid body 140A, the electrode body 115, and the second lid body 140B are positioned in this order from the first side to the second side in the first direction D1.

[0181] As shown in Fig. 7A, a step S1 of fixing the lid body 140 of the electrode body unit 111 is carried out. In the fixing step S1, a fixing device 40 of the manufacturing apparatus 20 is used. As shown in Fig. 8, the fixing device 40 fixes the first lid body 140A and the second lid body 140B of the electrode body unit 111. The fixing device 40 may fix the lid body 140 so that it does not move relative to the supplied exterior film 130.

[0182] 8, the manufacturing apparatus 20 may include a fixing device 40 used for the first lid body 140A and a fixing device 40 used for the second lid body 140B separately. In this example, the fixing device 40 used for the first lid body 140A and the fixing device 40 used for the second lid body 140B may have the same configuration and be arranged symmetrically.

[0183] As shown in FIG. 8, the fixing device 40 may include a fixing restriction part 41 and a fixing drive part 42. The fixing restriction part 41 contacts each of the first cover body 140A and the second cover body 140B from the outside in the first direction D1 to restrict outward movement. The fixing drive part 42 moves each of the first cover body 140A and the second cover body 140B outward in the first direction D1. The fixing drive part 42 presses each of the first cover body 140A and the second cover body 140B against the fixing restriction part 41. The fixing drive part 42 may press the cover body 140 against the fixing restriction part 41 by pulling the cover body 140 outward in the first direction D1.

[0184] The first cover body 140A, the electrode body 115, and the second cover body 140B are arranged in this order in the first direction D1. The "outside" in the first direction D1 refers to the side away from the center of gravity of the electrode body 115 in the first direction D1. The "inside" in the first direction D1 refers to the side closer to the center of gravity of the electrode body 115 in the first direction D1.

[0185] The fixed restricting portion 41 may be in contact with the outer main surface G2 of the lid body 140, which is the outer surface in the first direction D1. As will be described later, the exterior film 130 is wrapped around the electrode body unit 111 and is in circumferential contact with the side end surface G1 of the lid body 140. Even in this case, the outer main surface G2 is not covered by the exterior film 130. The fixed restricting portion 41 can continue to be in contact with the outer main surface G2 of the lid body 140. The fixed restricting portion 41 can stably fix the lid body 140.

[0186] The fixing device 40 may include a plurality of fixing restriction parts 41. The fixing restriction part 41 may be common to the first cover body 140A and the second cover body 140B. The fixing restriction part 41 used for the first cover body 140A and the fixing restriction part 41 used for the second cover body 140B may be provided separately.

[0187] 8, the fixing device 40 includes a fixed restricting portion 41 that contacts the first lid body 140A at two positions and a fixed restricting portion 41 that contacts the second lid body 140B at two positions. The fixed restricting portion 41 contacts the lid body 140 at two positions that are spaced apart in the second direction D2, which is the longitudinal direction of the lid body 140. The fixed restricting portion 41 contacts the lid body 140 near both ends in the second direction D2, which is the longitudinal direction of the lid body 140. In the illustrated example, the fixed restricting portion 41 is fixed to the exterior film 130 held by the film holding portion 29.

[0188] Without being limited to the illustrated example, the fixed restricting portion 41 may contact the lid body 140 from the outside in the first direction D1 at only one position. The fixed restricting portion 41 may contact the lid body 140 from the outside in the first direction D1 at three or more positions.

[0189] The fixing drive unit 42 may include an adsorption unit 43 that is adsorbed to the first cover 140A and the second cover 140B. The adsorption unit 43 is adsorbed to the cover 140 and can move outward in the first direction D1. When the adsorption unit 43 that is adsorbed to the cover 140 moves outward in the first direction D1, the cover 140 moves outward in the first direction D1 together with the adsorption unit 43. The cover 140 comes into contact with the fixing restriction unit 41, and is fixed in an appropriate position in the first direction D1.

[0190] The suction unit 43 may be suctioned to the outer main surface G2 of the lid body 140, which is the outer surface in the first direction D1. As will be described later, the exterior film 130 is wrapped around the electrode unit 111 and comes into circumferential contact with the side end surface G1 of the lid body 140. Even in this case, the outer main surface G2 is not covered by the exterior film 130. The fixed drive unit 42 can continue to be in contact with the outer main surface G2 of the lid body 140. The fixed drive unit 42 can stably fix the lid body 140.

[0191] 8, the suction portion 43 is attached to the lid body 140 at a position between the contact positions of the two fixing restricting portions 41 with the lid body 140. The suction portion 43 is located between the two fixing restricting portions 41 in the second direction D2, which is the longitudinal direction of the lid body 140. According to this example, the lid body 140 can be stably fixed in an appropriate position.

[0192] 8, the electrode unit 111 is located on the exterior film 130. The electrode unit 111 is positioned at an appropriate position on the exterior film 130. In a fixing step S1, the cover 140 of the electrode unit 111 may be fixed at an appropriate position relative to the exterior film 130.

[0193] In the illustrated example, the fixing restricting portion 41 is located at a predetermined position that is on the outside in the first direction D1 with respect to the supplied exterior film 130. The fixing driving portion 42 moves each lid body 140 outward in the first direction D1. In the fixing step S1, the lid body 140 comes into contact with the fixing restricting portion 41, thereby restricting its outward movement in the first direction D1. Therefore, in the fixing step S1, the lid body 140 of the electrode body unit 111 can be fixed at an appropriate position with respect to the exterior film 130.

[0194] The lid body 140 is physically connected to the electrode body 115 via the terminal 117. The terminal 117 is formed of a thin metal plate or the like. The terminal 117 may be flexible. That is, in the electrode body unit 111, the lid body 140 is movable relative to the electrode body 115. Even if the electrode body 115 is positioned relative to the exterior film 130 and fixed to the exterior film 130, the lid body 140 can move somewhat relative to the exterior film 130. As described below, the lid body 140 is bonded to the exterior film 130. By using the fixing device 40 to fix the lid body 140 to the exterior film 130, the exterior film 130 can be appropriately bonded to the side end surface G1 of the lid body 140 in step S2, which will be described later. Therefore, a stable seal can be achieved between the lid body 140 and the exterior film 130.

[0195] In the illustrated example, the fixing drive unit 42 includes an adsorption unit 43. The adsorption unit 43 can be adsorbed to the outer main surface G2 of the lid body 140 facing outward in the first direction D1. This allows the lid body 140 to be stably fixed to the exterior film 130 throughout the production of the energy storage element intermediate 110.

[0196] In the illustrated example, the suction portion 43 can be attached to the lid body 140 between two fixing restriction portions 41 that contact the same lid body 140. Therefore, the lid body 140 can be stably fixed in an appropriate position. In particular, one fixing restriction portion 41, the suction portion 43, and the other fixing restriction portion 41 are arranged in the longitudinal direction of the lid body 140. Therefore, the lid body 140 can be more stably fixed in an appropriate position.

[0197] The fixing device 40 described above is merely an example and may be modified as appropriate.

[0198] This completes the fixing step S1.

[0199] 7A, after the fixing step S1, a first bonding step S2 and a second bonding step S3 are performed. In the first bonding step S2 and the second bonding step S3, the fixing device 40 may continue to fix the lid body 140. In the example described below, although not shown, the fixing device 40 continues to fix the lid body 140 in the first bonding step S2 and the second bonding step S3.

[0200] In the first bonding step S2, the exterior film 130 wrapped around the electrode body unit 111 is bonded to the side end surface G1. In the first bonding step S2, the exterior film 130 may be wrapped around the electrode body unit 111, and the exterior film 130 may be bonded to the lid body 140. In the first bonding step S2, the winding device 50 and the first bonding device 70 of the manufacturing apparatus 20 may be used.

[0201] As shown in FIG. 7B, in the first bonding step S2, a step S21 of wrapping the exterior film 130 around the electrode body unit 111 may first be performed. FIG. 9 shows an example of an electrode body unit 111 wrapped with the exterior film 130. The exterior film 130 is in circumferential contact with the side end surface G1 of the lid body 140. More specifically, a first side edge portion A1 (see FIG. 4B) of the exterior film 130 is in circumferential contact with the side end surface G1 of the first lid body 140A. A second side edge portion A2 (see FIG. 4B) of the exterior film 130 is in circumferential contact with the side end surface G1 of the second lid body 140B.

[0202] 10A and 10B show a specific example of the winding step S21. As shown in Fig. 10A, the winding device 50 may include a film holding unit 29 that holds the exterior film 130. The film holding unit 29 holds both ends of the exterior film 130. The film holding unit 29, which holds both ends of the exterior film 130, moves relative to the electrode unit 111, whereby the exterior film 130 is wound around the electrode unit 111.

[0203] 10A, the exterior film 130 is in contact with the first surface G11, the second surface G12, and the third surface G13 of the lid 140. The exterior film 130 held by the film holding portion 29 extends from the second surface G12 to the first side in the third direction D3. The exterior film 130 held by the film holding portion 29 extends from the third surface G13 to the first side in the third direction D3.

[0204] As shown by the two-dot chain line in FIG. 10A, the winding device 50 may include a temporary joining device 53. The temporary joining device 53 temporarily joins the exterior film 130 to the side end surface G1 of the lid body 140. By temporarily joining the exterior film 130 to the side end surface G1 of the lid body 140, the exterior film 130 can be stably maintained in contact with the side end surface G1 at an appropriate position. Therefore, in the first joining step, the exterior film 130 can be easily and reliably joined to the side end surface G1. This allows the airtightness of the exterior body 120 to be stably ensured.

[0205] The temporary joining device 53 may include a first temporary joining tool 53A that presses the exterior film 130 against the first surface G11 of the lid body 140 to join the exterior film 130 to the first surface G11. The first temporary joining tool 53A may be used to temporarily join the exterior film 130 to the first surface G11.

[0206] The exterior film 130 may be joined to the first surface G11 over the entire length of the first surface G11 along the second direction D2. The exterior film 130 may be joined to the first surface G11 over a portion of the length of the first surface G11 along the second direction D2. The exterior film 130 may be joined to the first surface G11 over the entire width of the first surface G11 along the first direction D1. The exterior film 130 may be joined to the first surface G11 over a portion of the width of the first surface G11 along the first direction D1.

[0207] The temporary joining device 53 may include a second temporary joining tool 53B that presses the exterior film 130 against the second surface G12 of the lid body 140 to join the exterior film 130 to the second surface G12. The exterior film 130 may be temporarily joined to the first surface G12 using the second temporary joining tool 53B.

[0208] The exterior film 130 may be joined to the second surface G12 over the entire length of the second surface G12 along the third direction D3. The exterior film 130 may be joined to the second surface G12 over a portion of the length of the second surface G12 along the third direction D3. The exterior film 130 may be joined to the second surface G12 over the entire width of the second surface G12 along the first direction D1. The exterior film 130 may be joined to the second surface G12 over a portion of the width of the second surface G12 along the first direction D1.

[0209] The temporary joining device 53 may include a third temporary joining tool 53C that presses the exterior film 130 against the third surface G13 of the lid body 140 to join the exterior film 130 to the third surface G13. The exterior film 130 may be temporarily joined to the first surface G12 using a second temporary joining tool 53B.

[0210] The exterior film 130 may be joined to the third surface G13 along the entire length of the third surface G13 along the third direction D3. The exterior film 130 may be joined to the third surface G13 along a portion of the length of the third surface G13 along the third direction D3. The exterior film 130 may be joined to the third surface G13 along the entire width of the third surface G13 along the first direction D1. The exterior film 130 may be joined to the third surface G13 along a portion of the width of the third surface G13 along the first direction D1.

[0211] 10B, the exterior film 130 is further wrapped around the electrode unit 111. In the state shown in FIG. 10B, both end portions of the exterior film 130 are held by one film holding portion 29. The exterior film 130 is wrapped around the entire circumference of the electrode unit 111. A pair of extension portions 132A, 132B of the exterior film 130 extend from the electrode unit 111 and are held by the film holding portion 29.

[0212] 10B, the temporary joining device 53 may include a fourth temporary joining tool 53D that presses the exterior film 130 against the fourth surface G14 of the lid 140 to join the exterior film 130 to the fourth surface G14. The exterior film 130 may be temporarily joined to the fourth surface G14 using the fourth temporary joining tool 53D.

[0213] The exterior film 130 may be joined to the fourth surface G14 along the entire length of the fourth surface G14 along the second direction D2. The exterior film 130 may be joined to the fourth surface G14 along a portion of the length of the fourth surface G14 along the second direction D2. The exterior film 130 may be joined to the fourth surface G14 along the entire width of the fourth surface G14 along the first direction D1. The exterior film 130 may be joined to the fourth surface G14 along a portion of the width of the fourth surface G14 along the first direction D1.

[0214] 10B, the temporary joining device 53 may include a fifth temporary joining tool 53E that presses the pair of extending portions 132A, 132B of the exterior film 130 against each other to join the pair of extending portions 132A, 132B to each other. The pair of extending portions 132A, 132B may be temporarily joined at a portion using the fifth temporary joining tool 53E.

[0215] The winding step S21 shown in Figures 10A and 10B is merely an example. Figure 11 shows a modified example of the winding step S21. In the example shown in Figure 11, the film holding section 29 of the winding device 50 holds both ends of the exterior film 130 in an overlapping state. The exterior film 130 held by the film holding section 29 is maintained in a cylindrical shape. In the example shown in Figure 11, the electrode body unit 111 is inserted into the internal space of the cylindrical exterior film 130. The electrode body unit 111 inserted into the cylindrical exterior film 130 may be temporarily joined to the exterior film 130 using first to fourth temporary connectors 53A to 53D. The pair of extensions 132A, 132B may be joined to each other using a fifth temporary connector 53E.

[0216] In this way, the exterior film 130 is wound around the electrode unit 111, and the winding step S21 is completed. When the winding step is completed, the exterior film 130 comes into contact with the side end surface G1 of the lid body 140. In the state shown in FIG. 9, the first side edge portion A1 (see FIG. 4B) of the exterior film 130 is in circumferential contact with the first surface G11 to the fourth surface G14 of the first lid body 140A. The second side edge portion A2 (see FIG. 4B) of the exterior film 130 is in circumferential contact with the first surface G11 to the fourth surface G14 of the second lid body 140B.

[0217] The first to fourth temporary joining tools 53A to 53D of the temporary joining device 53 may be seal bars that heat the exterior film 130 while pressing it against the side end surface G1. The seal bars press the exterior film 130 toward the side end surface G1 while heating it. The exterior film 130 can be welded to the side end surface G1 of the lid 140 by applying pressure and heat. The heat-sealable resin layer L3 of the exterior film 130 may be welded to the side end surface G1. Similarly, the fifth temporary joining tool 53E may be a seal bar that heats the pair of extension portions 132A, 132B while pressing them toward each other.

[0218] However, the joining of the exterior film 130 is not limited to heat sealing. The joining of the exterior film 130 may be welding other than heat sealing. Examples of welding other than heat sealing include ultrasonic welding and high-frequency welding. In this example, the first temporary connector 53A to the fifth temporary connector 53E may be vibration devices that apply vibration or pressure and vibration. The joining of the exterior film 130 may also be brazing. Examples of brazing joints include joining using an adhesive or solder.

[0219] Each of the temporary connectors 53A to 53D may extend in the first direction D1 and temporarily connect both the first side edge A1 and the second side edge A2 of the exterior film 130. That is, the temporary connectors 53A to 53D that press the first side edge A1 of the exterior film 130 against the first lid body 140A and the temporary connectors 53A to 53D that press the second side edge A2 against the second lid body 140B may be integrally configured. Alternatively, the temporary connectors 53A to 53D that press the first side edge A1 of the exterior film 130 against the first lid body 140A and the temporary connectors 53A to 53D that press the second side edge A2 against the second lid body 140B may be provided separately.

[0220] In the illustrated configuration, the first to fifth temporary connectors 53A to 53E are provided separately, but this is not limited to this example. Two or more of the first to fifth temporary connectors 53A to 53E may be a common temporary connector. For example, the first temporary connector 53A may be the same temporary connector as any of the second to fifth temporary connectors 53B to 53E.

[0221] Any one or more of the first to fifth temporary connectors 53A to 53E may constitute any one of the first to fourth connectors 70A to 70D, and the film connector 91, which will be described later. In other words, any one or more of the first to fifth temporary connectors 53A to 53E may be used in combination with any one of the first to fourth connectors 70A to 70D, and the film connector 91, which will be described later.

[0222] 7B, after step S21 of winding the exterior film 130, a step of bonding the exterior film 130 to the side end surface G1 is performed. Step S2 may include a step of simultaneously pressing the exterior film 130 against a pair of opposing surfaces of the side end surface G1 to bond the exterior film 130 to the pair of surfaces. By bonding the pair of surfaces in parallel, the exterior film 130 can be bonded to the side end surface G1 in a short time.

[0223] The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against a pair of opposing surfaces of the side end surface G1 of the first lid body 140A to bond the exterior film 130 to the pair of surfaces. The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against a pair of opposing surfaces of the side end surface G1 of the second lid body 140B to bond the exterior film 130 to the pair of surfaces. The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against a pair of opposing surfaces of the side end surface G1 of each of the first lid body 140A and the second lid body 140B to bond the exterior film 130 to the pair of surfaces.

[0224] "Pressing the exterior film 130 against the side edge surface G1 simultaneously" means that the time period during which the exterior film 130 is pressed against one portion of the side edge surface G1 and the time period during which the exterior film 130 is pressed against another portion of the side edge surface G1 at least partially overlap. "Pressing the exterior film 130 against the side edge surface G1 simultaneously" means that the time period during which the exterior film 130 is pressed against one portion of the side edge surface G1 and the time period during which the exterior film 130 is pressed against the other portion of the side edge surface G1 do not have to be completely identical. Even if the timing at which the exterior film 130 starts to be pressed against one portion of the side edge surface G1 and the timing at which the exterior film 130 starts to be pressed against one portion of the side edge surface G1 are different, this can still be considered "pressing the exterior film 130 against the side edge surface G1 simultaneously." Even if the timing at which the exterior film 130 finishes being pressed against one portion of the side end face G1 and the timing at which the exterior film 130 finishes being pressed against one portion of the side end face G1 are different, this can still be considered to be "pressing the exterior film 130 against the side end face G1 simultaneously."

[0225] 7B, the first bonding step S2 includes a step S221 of bonding the exterior film 130 to the first surface G11 and the fourth surface G14, and a step S222 of bonding the exterior film 130 to the second surface G12 and the third surface G13. Steps S221 and S222 will be described in order. However, instead of step S221, the exterior film 130 may be bonded to the first surface G11 and the fourth surface G14 in order. Instead of step S222, the exterior film 130 may be bonded to the second surface G12 and the third surface G13 in order.

[0226] In step S221, as shown in Fig. 12A, the exterior film 130 is bonded to the first surface G11 and the fourth surface G14. In step S21, which is performed before step S221, the exterior film 130 comes into contact with the first lid body 140A and the second lid body 140B.

[0227] The first side edge A1 located within the first part 131A of the exterior film 130 contacts the first surface G11 of the first lid body 140A. The second side edge A2 located within the first part 131A of the exterior film 130 contacts the first surface G11 of the second lid body 140B. The first side edge A1 located within the fourth part 131D of the exterior film 130 contacts the fourth surface G14 of the first lid body 140A. The second side edge A2 located within the fourth part 131D of the exterior film 130 contacts the fourth surface G14 of the second lid body 140B.

[0228] In step S221, a first joining device 70 is used. The first joining device 70 includes a joining tool that simultaneously presses the exterior film 130 against a pair of opposing surfaces of the side end surface G1 to join the pair of surfaces. As shown in FIG. 12A , the first joining device 70 may include a first joining tool 70A and a fourth joining tool 70D. The first joining tool 70A presses the exterior film 130 against the first surface G11 of the lid body 140 to join the exterior film 130 to the first surface G11. The fourth joining tool 70D presses the exterior film 130 against the fourth surface G14 of the lid body 140 to join the exterior film 130 to the fourth surface G14.

[0229] 12A, in step S221, the first and fourth connectors 70A and 70D simultaneously press the exterior film 130 against the first and fourth surfaces G11 and G14. The first connector 70A connects the exterior film 130 to the first surface G11. The fourth connector 70D connects the exterior film 130 to the fourth surface G14.

[0230] In step S221, the first connector 70A presses and joins the first side edge A1 and the second side edge A2 located within the first part 131A of the exterior film 130 against the first surface G11 of the lid 140. A first seal S11 of the opening seal S1 is formed between the first side edge A1 located within the first part 131A and the first surface G11 of the first lid 140A. A first seal S11 of the opening seal S1 is formed between the second side edge A2 located within the first part 131A and the first surface G11 of the second lid 140B.

[0231] In step S221, the fourth connector 70D presses and joins the first side edge A1 and the second side edge A2 located within the fourth portion 131D of the exterior film 130 against the fourth surface G14 of the lid 140. The fourth seal S14 of the opening seal S1 is formed between the first side edge A1 located within the fourth portion 131D and the fourth surface G14 of the first lid 140A. The fourth seal S14 of the opening seal S1 is formed between the second side edge A2 located within the fourth portion 131D and the fourth surface G14 of the second lid 140B.

[0232] That is, in step S221, both the first sealed portion S11 and the fourth sealed portion S14 are formed. In step S221, the bonding between the exterior film 130 and the side end surface G1 proceeds in parallel on two surfaces, the first surface G11 and the fourth surface G14. As a result, the time required to bond the exterior film 130 and the side end surface G1 of the lid 140 can be shortened.

[0233] The first surface G11 and the fourth surface G14 to which the exterior film 130 is joined face each other in the second direction D2. The first connector 70A and the fourth connector 70D are positioned facing each other in the second direction D2. The first connector 70A and the fourth connector 70D press against each other in the second direction D2. The first connector 70A can function as a receiving device that receives pressure from the fourth connector 70D. The fourth connector 70D can also function as a receiving device that receives pressure from the first connector 70A. Therefore, during step S221, the posture of the electrode unit 111, which is pressed from both sides in the second direction D2 by the first connector 70A and the fourth connector 70D, can be stably maintained.

[0234] This completes step S221.

[0235] 7B, after step S221 of bonding the exterior film 130 to the first surface G11 and the fourth surface G14 is completed, step S222 is performed. In step S222, the exterior film 130 is bonded to the second surface G12 and the third surface G13.

[0236] In step S222, as shown in Fig. 12B, the exterior film 130 is bonded to the second surface G12 and the third surface G13. In step S21, which is performed before step S222, the exterior film 130 is in contact with the first lid body 140A and the second lid body 140B.

[0237] The first side edge A1 located within the second part 131B of the exterior film 130 contacts the second surface G12 of the first lid body 140A. The second side edge A2 located within the second part 131B of the exterior film 130 contacts the second surface G12 of the second lid body 140B. The first side edge A1 located within the third part 131C of the exterior film 130 contacts the third surface G13 of the first lid body 140A. The second side edge A2 located within the third part 131C of the exterior film 130 contacts the third surface G13 of the second lid body 140B.

[0238] In step S222, a first joining device 70 is used. The first joining device 70 includes a joining tool that simultaneously presses the exterior film 130 against a pair of opposing surfaces of the side end surface G1 to join the pair of surfaces. As shown in FIG. 12B , the first joining device 70 may include a second joining tool 70B and a third joining tool 70C. The second joining tool 70B presses the exterior film 130 against the second surface G12 of the lid body 140 to join the exterior film 130 to the second surface G12. The third joining tool 70C presses the exterior film 130 against the third surface G13 of the lid body 140 to join the exterior film 130 to the third surface G13.

[0239] 12B, in step S222, the second and third connectors 70B and 70C simultaneously press the exterior film 130 against the second surface G12 and the third surface G13. The second connector 70B connects the exterior film 130 to the second surface G12. The third connector 70C connects the exterior film 130 to the third surface G13.

[0240] In step S222, the first connector 70A presses and joins the first side edge A1 and the second side edge A2 located within the second part 131B of the exterior film 130 against the second surface G12 of the lid 140. A third seal S13 of the opening seal S1 is formed between the first side edge A1 located within the second part 131B and the second surface G12 of the first lid 140A. A first seal S12 of the opening seal S1 is formed between the second side edge A2 located within the second part 131B and the second surface G12 of the second lid 140B.

[0241] In step S222, the third connector 70C presses and joins the first side edge A1 and the second side edge A2 located within the third portion 131C of the exterior film 130 against the third surface G13 of the lid 140. A fourth seal S13 of the opening seal S1 is formed between the first side edge A1 located within the third portion 131C and the third surface G13 of the first lid 140A. A third seal S13 of the opening seal S1 is formed between the second side edge A2 located within the third portion 131C and the third surface G13 of the second lid 140B.

[0242] That is, in step S222, both the second sealed portion S12 and the third sealed portion S13 are formed. In step S222, the bonding of the exterior film 130 to the side end surface G1 proceeds in parallel on two surfaces, the second surface G12 and the third surface G13. As a result, the time required to bond the exterior film 130 to the side end surface G1 of the lid 140 can be shortened.

[0243] The second surface G12 and the third surface G13 to which the exterior film 130 is joined in step S222 face the third direction D3. The second connector 70B and the third connector 70C are positioned facing each other in the third direction D3. The second connector 70B and the third connector 70C press against each other in the third direction D3. The second connector 70B can function as a receiving device that receives pressure from the third connector 70C. The third connector 70C can also function as a receiving device that receives pressure from the second connector 70B. Therefore, during step S222, the posture of the electrode body unit 111, which is pressed from both sides in the third direction D3 by the second connector 70B and the third connector 70C, can be stably maintained.

[0244] This completes step S222.

[0245] The first joining device 70's first to fourth joining devices 70A to 70D may be seal bars that heat the exterior film 130 while pressing it against the side end surface G1. The seal bars press the exterior film 130 toward the side end surface G1 while heating it. The exterior film 130 can be welded to the side end surface G1 of the lid 140 by applying pressure and heat. The heat-sealable resin layer L3 of the exterior film 130 may be welded to the side end surface G1.

[0246] However, the joining of the exterior film 130 is not limited to heat sealing. The joining of the exterior film 130 may be welding other than heat sealing. Examples of welding other than heat sealing include ultrasonic welding and high-frequency welding. In this example, the first connector 70A to the fourth connector 70D may be vibration devices that apply vibration or pressure and vibration. The joining of the exterior film 130 may also be brazing. Examples of brazing joints include joining using an adhesive or solder.

[0247] Each of the connectors 70A to 70D may extend in the first direction D1 and connect the first side edge A1 of the exterior film 130 to the first lid body 140A and the second side edge A2 of the exterior film 130 to the second lid body 140B. That is, the connectors 70A to 70D that press the first side edge A1 of the exterior film 130 against the first lid body 140A and the connectors 70A to 70D that press the second side edge A2 against the second lid body 140B may be integrally configured. Alternatively, the connectors 70A to 70D that press the first side edge A1 of the exterior film 130 against the first lid body 140A and the connectors 70A to 70D that press the second side edge A2 against the second lid body 140B may be provided separately.

[0248] In the illustrated configuration, the first to fourth connectors 70A to 70D are provided separately, but this is not limiting. The first connector 70A may be the same as either the second connector 70B or the third connector 70C. The fourth connector 70D may be the same as the other of the second connector 70B or the third connector 70C. One connector may be used to connect two or more surfaces included in the side end surface G1 to the exterior film 130.

[0249] As shown in FIG. 7B, steps S221 and S2222 of bonding the exterior film 130 to the side end surface G1 are followed by steps S231 and S232 of bonding the exterior film 130 to the corner G1X.

[0250] Poor bonding is likely to occur between the first and second lid bodies 140A and 140B and the exterior film 130 at the corners G1X of the side end surface G1. By providing a process for bonding the exterior film 130 to the corners G1X, it is possible to stably bond the first and second lid bodies 140A and 140B and the exterior film 130 at the corners G1X. In other words, by providing a process for bonding the exterior film 130 to the corners G1X, it is possible to prevent poor bonding between the first and second lid bodies 140A and 140B and the exterior film 130 at the corners G1X of the side end surface G1.

[0251] The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against two or more corners G1X included in the side end surface G1 to bond the exterior film 130 to the two or more corners G1X. By bonding the exterior film 130 to the two or more corners G1X in parallel, the time required to bond all of the corners G1X included in the side end surface G1 to the exterior film 130 can be reduced.

[0252] The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against two or more corners G1X included in the side end surface G1 of the first lid body 140A, and bonding the exterior film 130 to the two or more corners G1X. The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against two or more corners G1X included in the side end surface G1 of the second lid body 140B, and bonding the exterior film 130 to the two or more corners G1X. The first bonding step S2 may include a step of simultaneously pressing the exterior film 130 against two or more corners G1X included in the side end surface G1 of each of the first lid body 140A and the second lid body 140B, and bonding the exterior film 130 to the two or more corners G1X.

[0253] Pressing the exterior film 130 against two corners G1X simultaneously means that the time period during which the exterior film 130 is pressed against one corner G1X and the time period during which the exterior film 130 is pressed against the other corner G1X at least partially overlap. Pressing the exterior film 130 against the side end face G1 simultaneously does not mean that the time period during which the exterior film 130 is pressed against one corner G1X and the time period during which the exterior film 130 is pressed against the other corner G1X need not be completely identical. Even if the timing at which the exterior film 130 starts to be pressed against one corner G1X and the timing at which the exterior film 130 starts to be pressed against the other corner G1X are different, this can still be considered "pressing the exterior film 130 against two corners G1X simultaneously." Even if the timing at which the exterior film 130 finishes being pressed against one corner G1X is different from the timing at which the exterior film 130 finishes being pressed against another corner G1X, this can still be considered "pressing the exterior film 130 against two corners G1X simultaneously."

[0254] Note that the exterior film 130 and the corner G1X may also be joined in steps S221 and S222. Therefore, "joining the exterior film to the corner" includes not only processing for joining the angle and exterior film that have not yet been joined, but also processing for joining the angle and exterior film that have already been joined.

[0255] 7B, the first bonding step S2 includes a step S231 of bonding the exterior film 130 to the two corners G1X, and a step S232 of bonding the exterior film 130 to the two corners G1X. Steps S231 and S232 will be described in order. However, instead of step S231, the two corners G1X to be bonded in step S231 may be bonded in order. Instead of step S232, the two corners G1X to be bonded in step S232 may be bonded in order.

[0256] As shown in FIGS. 13A and 13B, the first joining device 70 includes a plurality of corner connectors 75A-75D. Each of the corner connectors 75A-75D presses the exterior film 130 located on one corner G1X against the corner G1X to join the exterior film 130 to the corner G1X. The plurality of corner connectors 75A-75D may be separate, individual connectors. The corner G1X to be joined by each corner connector is formed between two surfaces included in the side end surface G1. Each corner connector may press the exterior film 130 against only a portion of each of the two surfaces to join them.

[0257] 13A and 13B, the first joining device 70 includes four corner connectors 75A to 75D. Each of the corner connectors 75A to 75D includes a folded surface that is folded to correspond to the corner G1X to be joined. Each of the corner connectors 75A to 75D brings the folded surface into contact with the exterior film 130, pressing the exterior film 130 against the corner G1X. The folded surface of each of the corner connectors 75A to 75D presses the exterior film 130 against only a portion of each of the two surfaces that form the corner G1X.

[0258] 13A, the first corner connector 75A presses the exterior film 130 against the corner G1X between the first surface G11 and the second surface G12 of the side end surface G1. At the same time, the second corner connector 75B presses the exterior film 130 against the corner G1X between the fourth surface G14 and the third surface G13 of the side end surface G1. In step S231, the exterior film 130 is joined to the corner G1X between the first surface G11 and the second surface G12 and the corner G1X between the fourth surface G14 and the third surface G13.

[0259] 13B, the exterior film 130 is pressed against the corner G1X between the first surface G11 and the third surface G13 of the side end surface G1 by the third corner connector 75C. At the same time, the exterior film 130 is pressed against the corner G1X between the fourth surface G14 and the second surface G12 of the side end surface G1 by the fourth corner connector 75D. In step S232, the exterior film 130 is joined to the corner G1X between the first surface G11 and the third surface G13 and the corner G1X between the fourth surface G14 and the second surface G12.

[0260] By using the corner connectors 75A to 75D, the exterior film 130 can be pressed locally against the corner G1X. The exterior film 130 can be stably joined to the side end surface G1 on the corner G1X. This prevents gaps from being generated between the exterior film 130 and the side end surfaces G1 of the first and second lid bodies 140A and 140B, improving the sealing performance between the exterior film 130 and the side end surfaces G1 of the first and second lid bodies 140A and 140B.

[0261] By using the corner connectors 75A to 75D, the exterior film 130 is pressed locally against the corner G1X of the side end face G1, thereby preventing the exterior film 130 from being pressed against the side end face G over an unnecessarily wide area. This prevents the electrode body 115 from being damaged by heat, pressure, vibration, etc. Similarly, it also prevents the exterior film 130 from being damaged by heat, pressure, vibration, etc.

[0262] In each of steps S231 and S232, the bonding of the exterior film 130 to the side end surface G1 proceeds in parallel on two corners G1X. By bonding the exterior film 130 to two or more corners G1X in parallel, the time required to bond the exterior film 130 to all corners G1X included in the side end surface G1 can be shortened.

[0263] In each of steps S231 and S232, two corner connectors simultaneously press the exterior film 130 against different corners G1X of the electrode unit 111. One corner connector can function as a receiver that receives pressure from the other corner connector. The other corner connector can also function as a receiver that receives pressure from one corner connector. Therefore, during the performance of steps S231 and S232, the orientation of the electrode unit 111 can be stably maintained by the multiple corner connectors 75.

[0264] 13A and 13B includes a folded surface that is bent to correspond to the corner G1X to be joined. The folded surface allows the exterior film 130 to be pressed against each of the two surfaces that form the corner G1X to be joined. Therefore, by using multiple corner connectors that include folded surfaces, the posture of the electrode unit 111 can be maintained more stably.

[0265] 13A and 13B simultaneously press the exterior film 130 against two diagonally disposed corners G1X of the lid 140, joining the exterior film 130 to the two corners G1X. The two corners G1X to be joined are diagonally disposed on the lid 140, which has a rectangular shape in plan view. Therefore, the posture of the electrode unit 111 can be maintained more stably by using a plurality of corner connectors including folded surfaces.

[0266] This completes steps S231 and S232.

[0267] The first corner connector 75A to the fourth corner connector 75D of the first joining device 70 may be seal bars that heat the exterior film 130 while pressing it against the side end surface G1. In the example shown in FIGS. 13A and 13B, the folded surface of the first joining device 70 corresponding to the corner G1X to be joined serves as the heating surface. The seal bar presses the exterior film 130 toward the corner G1X while heating it. The exterior film 130 can be welded to the corner G1X of the lid 140 by applying pressure and heat. The heat-sealable resin layer L3 of the exterior film 130 may be welded to the corner G1X.

[0268] However, the joining of the exterior film 130 is not limited to heat sealing. The joining of the exterior film 130 may be welding other than heat sealing. Examples of welding other than heat sealing include ultrasonic welding and high-frequency welding. In this example, the first corner connectors 75A to the fourth corner connectors 75D may be vibration devices that apply vibration or pressure and vibration. The joining of the exterior film 130 may also be brazing. Examples of brazing joints include joining using an adhesive or solder.

[0269] Each of the corner connectors 75A to 75D may extend in the first direction D1 and join the first side edge A1 of the exterior film 130 to the first lid body 140A and the second side edge A2 of the exterior film 130 to the second lid body 140B. That is, the corner connectors 75A to 75D that press the first side edge A1 of the exterior film 130 against the first lid body 140A and the corner connectors 75A to 75D that press the second side edge A2 against the second lid body 140B may be integrally configured. Alternatively, the corner connectors 75A to 75D that press the first side edge A1 of the exterior film 130 against the first lid body 140A and the corner connectors 75A to 75D that press the second side edge A2 against the second lid body 140B may be provided separately.

[0270] In the illustrated configuration, the first corner connector 75A to the fourth corner connector 75D are provided separately, but this is not limited to this example. The first corner connector 75A may be the same as either the third corner connector 75C or the fourth corner connector 75D. The second corner connector 75B may be the same as the other of the third corner connector 75C or the fourth corner connector 75D. One corner connector may be used to connect two or more corners G1X to the exterior film 130.

[0271] When step S232 is completed, an opening seal portion S1 is formed to seal between the side end surface G1 of the lid body 140 and the exterior film 130. The opening seal portion S1 includes a first seal portion S11, a second seal portion S12, a third seal portion S13, and a fourth seal portion S14. The opening seal portion S1 goes around the lid body 140. The opening seal portion S1 is circumferential.

[0272] As shown in Fig. 7B, step S232 completes the first joining step S2. As shown in Fig. 7A, after the first joining step S2, a second joining step S3 is performed to join the extending portions 132A and 132B. In the second joining step S3, the pair of extending portions 132A and 132B are joined to each other. In the second joining step S3, a second joining device 90 of the manufacturing apparatus 20 is used.

[0273] 14, the manufacturing apparatus 20 may further include a second joining device 90. The second joining device 90 joins a pair of extending portions 132A, 132B of the exterior film 130 wrapped around the electrode body unit 111, the extending portions 132A, 132B facing each other. The second joining device 90 may include a film joiner 91 that presses the pair of extending portions 132A, 132B of the exterior film 130 against each other to join the pair of extending portions 132A, 132B to each other. In configuration S2, the pair of extending portions 132A, 132B may be joined to each other by the film joiner 91.

[0274] This completes step S5.

[0275] The film splicer 91 may be a pair of seal bars that heat and pressurize the pair of extension portions 132A, 132B. Each seal bar heats and pressurizes one extension portion toward the other extension portion. The film splicer 91 may include a seal bar and a receiving device positioned opposite the seal bar. Between the seal bar and the receiving device, the pair of extension portions 132A, 132B are heated and pressurized. The pair of extension portions 132A, 132B can be welded to each other by applying pressure and heat. The heat-sealable resin layer L3 of the exterior film 130 that constitutes one extension portion may be welded to the other extension portion.

[0276] However, the joining of the pair of extension portions 132A, 132B is not limited to heat sealing. The joining of the pair of extension portions 132A, 132B may be welding other than heat sealing. Examples of welding other than heat sealing include ultrasonic welding and high-frequency welding. In this example, the film connector 91 may be a vibration device that applies vibration or pressure and vibration. The joining of the pair of extension portions 132A, 132B may also be brazing. Examples of brazing bonding include bonding using an adhesive or solder.

[0277] The film splicer 91 may be any one of the first connector 70A to fourth connector 70D included in the first joining device 70. In other words, the film splicer 91 may be used in combination with any one of the first connector 70A to fourth connector 70D included in the first joining device 70.

[0278] The film jointer 91 may be any one of the first temporary jointer 53A to the fifth temporary jointer 53E included in the first joining device 70. In other words, the film jointer 91 may be used in combination with any one of the first temporary jointer 53A to the fifth temporary jointer 53E included in the first joining device 70.

[0279] The above manufacturing method produces an energy storage element intermediate 110. The energy storage element 100 is obtained using the energy storage element intermediate 110. As an example, as shown in FIG. 15 , a manufacturing apparatus 10 for the energy storage element 100 may include a manufacturing apparatus 20 for the energy storage element intermediate 110 and an injection apparatus 15 that injects an electrolyte solution into the energy storage element intermediate 110. A manufacturing method for the energy storage element 100 may include a step of manufacturing the energy storage element intermediate 110 by the above manufacturing method, and a step of injecting an electrolyte solution into the energy storage element intermediate 110.

[0280] In the specific example described above, the first joining device 70 of the energy storage element intermediate 110 includes joiners 70A-70D that simultaneously press the exterior film 130 against a pair of opposing surfaces of the side end surface G1 to join the pair of surfaces. The manufacturing method for the energy storage element intermediate 110 includes a step of joining the exterior film 130 to the side end surface G1. In the joining step, the joiners 70A-70D simultaneously press the exterior film 130 against a pair of opposing surfaces of the side end surface G1 to join the exterior film 130 to the pair of surfaces. According to this specific example, the pair of opposing surfaces included in the side end surface G1 are joined to the exterior film 130 in parallel. Therefore, the time required to join the side end surface G1 and the exterior film 130 can be shortened.

[0281] In the illustrated example, the lid 140 has a rectangular shape when viewed from the first direction D1. However, this is not limited to this example. As shown in FIG. 16, the lid 140 may have a hexagonal shape when viewed from the first direction D1. In the example shown in FIG. 16, the first connector 70A and the second connector 70B simultaneously press the exterior film 130 against a pair of opposing surfaces G11 and G14 of the side end surface G1, thereby joining the exterior film 130 to the pair of surfaces G11 and G12. Even in the example shown in FIG. 16, the time required to circumferentially join the side end surface G1 and the exterior film 130 can be reduced.

[0282] 16, the first joining device 70 may simultaneously press the exterior film 130 against another pair of opposing surfaces G12, G13 of the side end surface G1, and join the exterior film 130 to the other pair of surfaces G12, G13. The first joining device 70 may simultaneously press the exterior film 130 against yet another pair of opposing surfaces G15, G16 of the side end surface G1, and join the exterior film 130 to the yet another pair of surfaces G15, G16. These examples further reduce the time required to circumferentially join the side end surface G1 and the exterior film 130.

[0283] 12A and 12B, the first joining device 70 simultaneously presses the exterior film 130 against a pair of opposing surfaces of the side end surface G1, and joins the exterior film 130 to the pair of surfaces. The first joining device 70 simultaneously presses the exterior film 130 against another pair of opposing surfaces of the side end surface G1, and joins the exterior film 130 to the other pair of surfaces. That is, after joining the pair of surfaces of the side end surface G1 and the exterior film 130 in parallel, the first joining device 70 joins the other pair of surfaces of the side end surface G1 and the exterior film 130 in parallel.

[0284] As shown in FIG. 17 , a first bonding device 70 may be used to press the exterior film 130 against a pair of surfaces and another pair of surfaces simultaneously, thereby bonding the exterior film 130 to the pair of surfaces and the other pair of surfaces. Furthermore, the first bonding device 70 may be used to press the exterior film 130 against all surfaces included in the side end surface G1 simultaneously, thereby bonding the exterior film 130 to all surfaces in parallel. For example, as shown in FIG. 7C , the first bonding step S2 of wrapping and bonding the exterior film 130 around the electrode body unit 111 may include step S22 of bonding the exterior film 130 to the first surface G11 to the fourth surface G14, instead of step S221 and step S222 shown in FIG. 7B . According to these specific examples, the time required to circumferentially bond the side end surface G1 and the exterior film 130 can be further reduced.

[0285] In the example shown in FIG. 17, the first joining device 70 includes a plurality of connectors 71A-71D corresponding to the plurality of surfaces included in the side end face G1. The plurality of surfaces are arranged circumferentially. The plurality of connectors are also arranged circumferentially. Each connector 71A-71D is positioned so as to be offset from the corresponding joining target surface of the side end face G1 to one side in the circumferential direction in which the plurality of surfaces are arranged. Each connector 71A-71D is positioned so as to be offset from the corresponding surface of the side end face G1 to the clockwise side or counterclockwise side in the circumferential direction in which the plurality of surfaces are arranged. In the example shown in FIG. 17, each connector 71A-71D is positioned so as to be offset from the corresponding surface of the side end face G1 to the clockwise side in the circumferential direction in which the plurality of surfaces are arranged. The end position of each connector is aligned with the corresponding surface of the side end face G1 on the other side in the circumferential direction in which the plurality of surfaces are arranged. As a result, by using a connecting tool that is longer than the surface included in side end surface G1, i.e., without preparing a connecting tool that is the same length as the surface included in side end surface G1, the exterior film 130 can be pressed against all surfaces included in side end surface G1 at the same time, and the exterior film 130 can be joined to all surfaces in parallel.

[0286] In the above-described specific example, the first joining device 70 includes a plurality of corner joiners 75A-75D that simultaneously press the exterior film 130 against two or more corners G1X included in the side end surface G1. By simultaneously pressing the exterior film 130 against two or more corners G1X and joining the two or more corners G1X and the exterior film 130, the time required to circumferentially join the side end surface G1 of the lid 140 and the exterior film 130 can be shortened.

[0287] 7B includes a step S231 of joining the exterior film 130 to the two corners G1X and a step S232 of joining the exterior film 130 to the two corners G1X. In the example shown in FIGS. 13A and 13B, in both steps S231 and S232, the exterior film 130 is joined in parallel to the two corners G1X included in the side edge surface G1. However, in either step S231 or S232, the exterior film 130 may be joined sequentially to the two corners G1X included in the side edge surface G1. Even in this specific example, by joining the exterior film 130 in parallel to the two corners G1X included in the side edge surface G1 in the other of steps S221 and S222, the time required to join the side edge surface G1 and the exterior film 130 can be shortened.

[0288] As shown in FIG. 18 , multiple corner connectors 75A-75D may be used to simultaneously press the exterior film 130 against all corners G1X included in the side end surface G1, thereby joining the exterior film 130 to all corners 415 in parallel. Multiple corner connectors 75A-75D may be used to simultaneously press the exterior film 130 against four corners G1X included in the side end surface G1, thereby joining the exterior film 130 to the four corners 415 in parallel. For example, as shown in FIG. 7C , the first joining step S2 of wrapping and joining the exterior film around the electrode unit may include step S23 of joining the exterior film 130 to all corners G1X, instead of steps S231 and S232 shown in FIG. 7B . According to these specific examples, the time required to circumferentially join the side end surface G1 of the lid 140 and the exterior film 130 can be reduced.

[0289] 19A to 21B, the first joining device 70 may include a front joining tool and a rear joining tool used to join one surface of the side end surface G1 to the exterior film 130. The front joining tool presses the exterior film 130 against one surface of the side end surface G1 to join the exterior film 130 to the one surface. The rear joining tool presses the exterior film 130 against the one surface after the front joining tool to join the exterior film 130 to the one surface.

[0290] The step of joining the exterior film 130 and the side end surface G1 may include a step using a front joining tool and a step using a rear joining tool, as shown in Figures 19A and 19B. In the step using the front joining tool, the exterior film 130 is pressed against one surface of the side end surface G1 to join the exterior film 130 to the one surface. The step using the rear front joining tool is a step performed after the step using the front joining tool, in which the exterior film 130 is pressed against one surface to join the exterior film 130 to the one surface.

[0291] In the example shown in FIGS. 19A and 19B, the first surface G11 and the exterior film 130 are joined together using a first front connector 70AP and a first rear connector 70AS.

[0292] During the bonding process, the temperatures of the exterior film 130 and the lid 140 may rise. The temperatures of the exterior film 130 and the lid 140 are particularly likely to rise when bonding is performed by welding, such as heat sealing, ultrasonic bonding, or high-frequency bonding. As the temperatures of the exterior film 130 and the lid 140 rise, the temperature of the electrode assembly 115 may also rise. The electrode assembly 115 may be damaged if heated to a high temperature for a long period of time.

[0293] During the bonding process, the time required to heat the exterior film 130 and the lid body 140 to a temperature suitable for processing is shorter than the time required for the electrode body 115 to be heated to a high temperature as the exterior film 130 and the lid body 140 are heated. Therefore, by dividing the process of bonding one surface of the side end face G1 to the exterior film 130 into two steps, the time during which the electrode body 115 is heated to a high temperature can be significantly reduced. As a result, damage to the electrode body 115 due to heating as the exterior film 130 and the lid body 140 are bonded can be suppressed.

[0294] Furthermore, shortening the time for each joining step can prevent the time required to join one of the side end faces G1 to the exterior film 130 from becoming too long. That is, it is possible to prevent the time required to join the exterior film 130 to the side end face G1 from becoming too long, while also preventing damage to the electrode body 115 when joining the exterior film 130 to the side end face G1.

[0295] The front joining tool is used to join the side end surface G1 and the exterior film 130, and then the rear joining tool is used to join the side end surface G1 and the exterior film 130. Therefore, "after the front joining tool is used, the exterior film is pressed against one surface to join the exterior film to one surface" includes not only performing processing for joining the one surface and exterior film that have not yet been joined, but also performing processing for joining the one surface and exterior film that have already been joined.

[0296] The first joining device 70 may further include another front joining device and another rear joining device used to join the exterior film 130 to another surface of the side end surface G1. The other front joining device presses the exterior film 130 against the other surface of the side end surface G1 and joins the exterior film 130 to the other surface. The rear joining device presses the exterior film 130 against the other surface after the other front joining device and joins the exterior film 130 to the other surface. This specific example further shortens the time the electrode body 115 is heated to a high temperature. Therefore, damage to the electrode body 115 can be more effectively suppressed.

[0297] In the example shown in Figures 19A and 19B, the fourth surface G14 and the exterior film 130 are joined using a fourth leading connector 70DP and a fourth trailing connector 70DS.

[0298] When the step of joining one surface of the side end surface G1 and the exterior film 130 is divided into two steps, as described above, the exterior film 130 may be pressed against a pair of opposing surfaces of the side end surface G1 at the same time, and the exterior film 130 may be joined to the pair of surfaces in parallel. Furthermore, the exterior film 130 may be pressed against another pair of opposing surfaces of the side end surface G1 at the same time, and the exterior film 130 may be joined to the other pair of surfaces.

[0299] 19A and 19B, the first connecting device 70 may include a first leading connector 70AP, a first trailing connector 70AS, a fourth leading connector 70DP, and a fourth trailing connector 70DS. The first leading connector 70AP and the first trailing connector 70AS may be configured similarly to the first connector 70A described above. The fourth leading connector 70DP and the fourth trailing connector 70DS may be configured similarly to the fourth connector 70D described above.

[0300] 20A and 20B, the first connecting device 70 may include a second leading connector 70BP, a second trailing connector 70BS, a third leading connector 70CP, and a third trailing connector 70CS. The second leading connector 70BP and the second trailing connector 70BS may be configured similarly to the second connector 70B described above. The third leading connector 70CP and the third trailing connector 70CS may be configured similarly to the third connector 70C described above.

[0301] As shown in Fig. 19A, the first front connector 70AP presses the exterior film 130 against the first surface G11 and joins the exterior film 130 to the first surface G11. As shown in Fig. 19B, the first back connector 70AS presses the exterior film 130 against the first surface G11 after the first front connector 70AP and joins the exterior film 130 to the first surface G11.

[0302] As shown in Fig. 20A, the second front connector 70BP presses the exterior film 130 against the second surface G12 and joins the exterior film 130 to the second surface G12. As shown in Fig. 20B, the second back connector 70BS presses the exterior film 130 against the second surface G12 after the second front connector 70BP and joins the exterior film 130 to the second surface G12.

[0303] As shown in Fig. 20A, the third front connector 70CP presses the exterior film 130 against the third surface G13 and joins the exterior film 130 to the third surface G13. As shown in Fig. 20B, the third back connector 70CS presses the exterior film 130 against the third surface G13 after the third front connector 70CP and joins the exterior film 130 to the third surface G13.

[0304] As shown in Fig. 19A, the fourth first connector 70DP presses the exterior film 130 against the fourth surface G14 and joins the exterior film 130 to the fourth surface G14. As shown in Fig. 19B, the fourth posterior connector 70DS presses the exterior film 130 against the fourth surface G14 after the fourth first connector 70DP and joins the exterior film 130 to the fourth surface G14.

[0305] In the manufacturing method shown in Fig. 7D, step S2 of joining the exterior film to the electrode unit includes step S2211, step S2212, step S2221, and step S2222. Steps S2211 and S2212 correspond to step S221 in Fig. 7B divided into two steps. Steps S2221 and S2222 correspond to step S222 in Fig. 7B divided into two steps.

[0306] 19A shows step S2211. In step S2211, the exterior film 130 is pressed against a pair of opposing first and fourth surfaces G11 and G14 simultaneously. In step S2221, the exterior film 130 is joined to the first and fourth surfaces G11 and G14. In step S2211, a first front connector 70AP and a fourth front connector 70DP are used.

[0307] 19B shows step S2212. In step S2212, the exterior film 130 is pressed against a pair of opposing first and fourth surfaces G11 and G14 simultaneously. In step S2222, the exterior film 130 is joined to the first and fourth surfaces G11 and G14. In step S2212, a first rear connector 70AS and a fourth rear connector 70DS are used.

[0308] 20A shows step S2221. In step S2221, the exterior film 130 is pressed against a pair of opposing second and third surfaces G12 and G13 simultaneously. In step S2221, the exterior film 130 is joined to the second and third surfaces G12 and G13. In step S2221, a second front connector 70BP and a third front connector 70CP are used.

[0309] 20B shows step S2222. In step S2222, the exterior film 130 is pressed against a pair of opposing second and third surfaces G12 and G13 simultaneously. In step S2222, the exterior film 130 is joined to the second and third surfaces G12 and G13. In step S2222, the second rear connector 70BS and the third rear connector 70CS are used.

[0310] The time required for each of steps S2111 to S2222 in Fig. 7D can be shortened compared to the time required for each of steps S221 and S222 in Fig. 7B. Because the joining of exterior film 130 to one surface included in side end surface G1 is divided into two steps, the time required for each of steps S2111 to S2222 in Fig. 7D can be shortened to about half the time required for each of steps S221 and S222 in Fig. 7B.

[0311] When the first joining tool and the second joining tool are separately provided, the first joining process using the first joining tool and the second joining process using the second joining tool can be performed in parallel. Therefore, according to the manufacturing method shown in FIG. 7D, the time interval for supplying the workpieces to the first joining device 70 can be shortened. When the processing time for the workpieces in the process upstream of the process using the first joining device 70 is short, the workpieces can be processed with high efficiency in accordance with the production speed of the upstream process. According to the manufacturing method shown in FIG. 7D, the time interval for sending the workpieces from the first joining device 70 can be shortened. When the processing time for the workpieces in the process downstream of the process using the first joining device 70 is short, the workpieces can be processed with high efficiency in accordance with the production speed of the downstream process.

[0312] In the illustrated configuration, the first front connector 70AP to the fourth front connector 70DP and the first rear connector 70AS to the fourth rear connector 70DS are provided separately. However, this is not limited to the illustrated example. Two or more of the first front connector 70AP to the fourth front connector 70DP and the first rear connector 70AS to the fourth rear connector 70DS may be common connectors. For example, the first front connector 70AP may be the first rear connector 70AS.

[0313] In the manufacturing method shown in Fig. 7D, a joining process using a front connector and a joining process using a rear connector are successively performed on one surface included in the side end surface G1 and the exterior film 130. However, this is not limited to this example. As shown in Fig. 7E, between the joining process using a front connector and the joining process using a rear connector on one surface of the side end surface G1 and the exterior film 130, a joining process using another front connector or another rear connector on another surface of the side end surface G1 and the exterior film 130 may be performed. The manufacturing method shown in Fig. 7E differs from the manufacturing method shown in Fig. 7D in that the order of steps S2212 and S2221 is reversed, but the other steps are the same.

[0314] According to the example shown in FIG. 7E, in step S2211, the exterior film 130 is bonded to the first surface G11 and the fourth surface G14. In the next step S2221, the exterior film 130 is bonded to the second surface G12 and the third surface G13. In the subsequent step S2212, the exterior film 130 is bonded to the first surface G11 and the fourth surface G14. In the next step S2222, the exterior film 130 is bonded to the second surface G12 and the third surface G13. According to the first bonding step S2 shown in FIG. 7E, the surface of the side end surface G1 to which the exterior film 130 is bonded is changed. According to this specific example, the corner G1X and the exterior film 130 can be stably bonded. According to this specific example, the bonding strength between the exterior film 130 and the side end surface G1 can be made uniform among the multiple surfaces included in the side end surface G1.

[0315] In the example shown in Figures 19A to 20B, the first front connector 70AP and the fourth front connector 70DP simultaneously press the exterior film 130 against the side end surface G1. The first rear connector 70AS and the fourth rear connector 70DS simultaneously press the exterior film 130 against the side end surface G1. The second front connector 70BP and the third front connector 70CP simultaneously press the exterior film 130 against the side end surface G1. The second rear connector 70BS and the third rear connector 70CS simultaneously press the exterior film 130 against the side end surface G1.

[0316] Unlike the example shown in FIGS. 19A to 20B, the exterior film 130 may be joined in parallel to the first surface G11 to the fourth surface G14 of the side end surface G1 using a front connector, as in the manufacturing method described with reference to FIG. 16. The exterior film 130 may be joined in parallel to the first surface G11 to the fourth surface G14 of the side end surface G1 using a rear connector, as in the manufacturing method described with reference to FIG. 16. The exterior film 130 may be joined in parallel to all surfaces included in the side end surface G1 using a front connector, as in the manufacturing method described with reference to FIG. 16. The exterior film 130 may be joined in parallel to all surfaces included in the side end surface G1 using a rear connector, as in the manufacturing method described with reference to FIG. 16. More specifically, the first front connector 70AP, the second front connector 70BP, the third front connector 70CP, and the fourth front connector 70DP may simultaneously press the exterior film 130 against the side end surface G1. The first rear connector 70AS, the second rear connector 70BS, the third rear connector 70CS, and the fourth rear connector 70DS may simultaneously press the exterior film 130 against the side end surface G1. According to this specific example, the time required to circumferentially join the side end surface G1 and the exterior film 130 can be further reduced.

[0317] The first joining device 70 may include a leading corner joining device and a trailing corner joining device as corner joining devices. By using the leading corner joining device and the trailing corner joining device to join the exterior film 130 to one corner in sequence, it is possible to prevent the electrode body 115 from being maintained at a high temperature for a long period of time.

[0318] As described above, the first joining device 70 may include a seal bar as a joining tool. As another specific example, as shown in FIGS. 26A to 26C, the first joining device 70 may include a rotatable roller 781 including a heated outer circumferential surface 781x as a joining tool. The roller 781 moves over the side end surface G1 while rotating. The roller 781 heats and presses the exterior film 130 between itself and the side end surface G1. The roller 781 presses the exterior film 130 against the side end surface G1 to join the exterior film 130 to the side end surface G1. The side end surface G1 may be welded to the heat-sealable resin layer L3 of the exterior film 130. The side end surface G1 may be heat-sealed to the heat-sealable resin layer L3 of the exterior film 130.

[0319] The first joining device 70 may include multiple rollers 781. The multiple rollers 781 simultaneously press the exterior film 130 against the side end surface G1. The multiple rollers 781 can join the exterior film 130 in parallel to the side end surface G1 at multiple positions where the rollers 781 are in contact with the exterior film 130. This reduces the time required to circumferentially join the side end surface G1 and the exterior film 130 together.

[0320] As shown in FIGS. 21A to 23, the multiple rollers 781 may simultaneously press the exterior film 130 against different surfaces of the side end surface G1. According to this example, the exterior film 130 can be bonded to different surfaces of the side end surface G1 in parallel. This reduces the time required to circumferentially bond the side end surface G1 and the exterior film 130 together. Furthermore, because the multiple rollers 781 press the exterior film 130 against multiple surfaces of the side end surface G1 of the lid 140, the posture of the lid 140 can be stabilized during the bonding process. This allows the side end surface G1 and the exterior film 130 to be bonded with high precision.

[0321] 21A to 22B, the plurality of rollers 781 may simultaneously press the exterior film 130 against a pair of opposing surfaces of the side end surface G1. According to this specific example, one roller 781 can function as a receiver that receives pressure from another roller 781. The other roller 781 can function as a receiver that receives pressure from one roller 781. Since the electrode unit 111 is positioned between the plurality of rollers 781, the posture of the electrode unit 111 can be stably maintained.

[0322] 21A and 21B show an example of a joining process using a plurality of rollers 781. FIG.

[0323] 21A may correspond to step S221 in FIG. 7B. As shown in FIG. 21A, the first roller 781A moves on the first surface G11 toward the first side in the second direction D2. The first roller 781A presses the exterior film 130 against the first surface G11 to bond the exterior film 130 to the first surface G11. As shown in FIG. 21A, the second roller 781B moves on the fourth surface G14 toward the second side in the second direction D2. The second roller 781B presses the exterior film 130 against the fourth surface G14 to bond the exterior film 130 to the fourth surface G14.

[0324] FIG. 21B may correspond to step S222 in FIG. 7B. The step shown in FIG. 21B is performed after the step shown in FIG. 21A. As shown in FIG. 21B, the first roller 781A moves on the second surface G12 toward the first side in the third direction D3. The first roller 781A presses the exterior film 130 against the second surface G12 to bond the exterior film 130 to the second surface G12. As shown in FIG. 21B, the second roller 781B moves on the third surface G13 toward the second side in the third direction D3. The second roller 781B presses the exterior film 130 against the third surface G13 to bond the exterior film 130 to the third surface G13.

[0325] 21A and 21B, the first roller 781A can move continuously over the first surface G11 and the second surface G12 of the side end surface G1. The second roller 781B can move continuously over the fourth surface G14 and the third surface G13 of the side end surface G1. Therefore, the posture of the electrode unit 111 can be maintained more stably during the bonding process. As a result, the exterior film 130 can be bonded to the lid 140 with higher precision.

[0326] 22A and 22B show another example of a joining process using multiple rollers 781.

[0327] 22A may correspond to step S221 in FIG. 7B. As shown in FIG. 22A, the first roller 781A moves on the first surface G11 toward the second side in the second direction D2. The first roller 781A presses the exterior film 130 against the first surface G11 to bond the exterior film 130 to the first surface G11. As shown in FIG. 22A, the second roller 781B moves on the fourth surface G14 toward the second side in the second direction D2. The second roller 781B presses the exterior film 130 against the fourth surface G14 to bond the exterior film 130 to the fourth surface G14.

[0328] 22A, the first roller 781A and the second roller 781B are positioned opposite each other in the third direction D3. This allows the posture of the electrode unit 111 to be maintained more stably during the bonding process. As a result, the exterior film 130 can be bonded to the lid 140 with higher accuracy.

[0329] FIG. 22B may correspond to step S221 in FIG. 7B. The step shown in FIG. 22B is performed after the step shown in FIG. 22A. As shown in FIG. 22B, the first roller 781A moves on the second surface G12 toward the second side in the third direction D3. The first roller 781A presses the exterior film 130 against the second surface G12 to bond the exterior film 130 to the second surface G12. As shown in FIG. 22B, the second roller 781B moves on the third surface G13 toward the second side in the third direction D3. The second roller 781B presses the exterior film 130 against the third surface G13 to bond the exterior film 130 to the third surface G13.

[0330] 22B, the first roller 781A and the second roller 781B are positioned opposite each other in the second direction D2. This allows the posture of the electrode unit 111 to be maintained more stably during the bonding process. As a result, the exterior film 130 can be bonded to the lid 140 with higher accuracy.

[0331] FIG. 23 shows another example of the bonding process using multiple rollers 781. In the example shown in FIG. 23, the multiple rollers 781 press the exterior film 130 against different surfaces of the side end surface G1. The first roller 781A moves continuously over the second surface G12 and the first surface G11 of the side end surface G1. The first roller 781A can bond the exterior film 130 to the second surface G12 and the first surface G11. The second roller 781B moves continuously over the fourth surface G14 and the third surface G13 of the side end surface G1. The second roller 781B can bond the exterior film 130 to the fourth surface G14 and the third surface G13. The example shown in FIG. 23 also allows the posture of the electrode unit 111 to be stably maintained during the bonding process. Therefore, the exterior film 130 can be bonded to the lid 140 with high precision.

[0332] 24 and 25, multiple rollers 781 may press the exterior film 130 against the same surface of the side end surface G1. In this example, the multiple rollers 781 can join the exterior film 130 to the side end surface G1 in parallel at multiple positions where the rollers 781 are in contact with the exterior film 130. Since the multiple rollers 781 are used to join the exterior film 130 to one surface of the side end surface G1, the movement speed of each roller 781 can be increased. Therefore, the time required to circumferentially join the side end surface G1 and the exterior film 130 can be reduced.

[0333] In the example shown in FIG. 24, the first roller 781A and the second roller 781B may move in the same direction on the same surface of the side end surface G1. In this example, the first roller 781A and the second roller 781B can pass through the same area on the side end surface G1. That is, the bonding of the exterior film 130 to the side end surface G1 at each position on the side end surface G1 is performed twice by the first roller 781A and the second roller 781B. According to this example, the movement speed of the first roller 781A and the second roller 781B can be increased, thereby shortening the time required to circumferentially bond the side end surface G1 to the exterior film 130. Furthermore, as in the example described with reference to FIGS. 19A to 20B, damage to the electrode body 115 can be suppressed.

[0334] As shown in FIG. 25, the first joining device 70 may further include a third roller 781C and a fourth roller 781D in addition to the first roller 781A and the second roller 781B. In the example shown in FIG. 25, the first roller 781A and the second roller 781B press the exterior film 130 against the same surface of the side end surface G1. The third roller 781C and the fourth roller 781D press the exterior film 130 against the same surface of the side end surface G1. According to the example shown in FIG. 25, the rollers 781 simultaneously press the exterior film 130 against a pair of opposing surfaces of the side end surface G1, and multiple rollers 781 press the exterior film 130 against the same surface of the side end surface G1. According to the example shown in FIG. 25, the time required to circumferentially join the side end surface G1 and the exterior film 130 can be reduced. Furthermore, the posture of the electrode unit 111 can be stably maintained during the joining process. Therefore, the exterior film 130 can be joined to the lid 140 with high precision.

[0335] Unlike the example shown in FIG. 25, multiple rollers 781 may simultaneously press the exterior film 130 against all surfaces included in the side end surface G1. For example, the first roller 781A may press the exterior film 130 against the first surface G11. The second roller 781B may press the exterior film 130 against the second surface G12. The third roller 781C may press the exterior film 130 against the third surface G13. The fourth roller 781D may press the exterior film 130 against the fourth surface G14. The first roller 781A to the fourth roller 781D may simultaneously press the exterior film 130 against the first surface G11 to the fourth surface G14. According to this specific example, step S22 shown in FIG. 7C can be performed, similar to the example shown in FIG. 17. According to this specific example, the time required to circumferentially join the side end surface G1 and the exterior film 130 can be further reduced.

[0336] The roller 781 may be incorporated into a roller-type heater 78. As shown in FIGS. 26A to 26C, the roller-type heater 78 may include a roller 781, a tip portion 782, a base portion 783, and a pressure portion 784. As described above, the roller 781 includes a heated outer circumferential surface 781x. The tip portion 782 rotatably holds the roller 781. The base portion 783 holds the tip portion 782. The tip portion 782 is movable relative to the base portion 783 in an expansion / contraction direction D78 that is perpendicular to the rotation axis A781 of the roller 781. In the illustrated example, the expansion / contraction direction D78 is perpendicular to the rotation axis A781 of the roller 781.

[0337] The pressure applying portion 784 is located between the distal end portion 782 and the proximal end portion 783. The pressure applying portion 784 is supported by the proximal end portion 783 and presses the distal end portion 782 in a direction in which the distal end portion 782 moves away from the proximal end portion 783. The pressure applying portion 784 presses the distal end portion 782 in the extension / contraction direction D78. The pressure applying portion 784 presses the distal end portion 782 and the proximal end portion 783 so that the distal end portion 782 and the proximal end portion 783 move away from each other in the extension / contraction direction D78.

[0338] When no external force is applied to the roller heater 78, the overall length of the roller heater 78 is extended by the force from the pressure applying unit 784. The tip end 782 can approach the base end 783 along the extension / contraction direction D78 by applying a force that resists the pressing force of the pressure applying unit 784. In other words, when the roller heater 78 is subjected to an external force that presses the roller 781 and the tip end 782 toward the base end 783, the overall length of the roller heater 78 is shortened.

[0339] 26B and 26C, the actual dimensions of the lid 140 may deviate from the planned dimensions, in other words, the designed dimensions. In Figures 26B and 26C, the position of the side end surface G1 at the planned dimensions is indicated by a two-dot chain line.

[0340] The dimensions of the lid 140 shown in Fig. 26B are larger than the design dimensions shown in Fig. 26A. In the example shown in Fig. 26B, the force applied from the lid 140 to the roller heater 78, which presses the roller 781 and the tip end 782 toward the base end 783, is increased, and the overall length of the roller heater 78 is shortened.

[0341] The dimensions of the lid 140 shown in Fig. 26C are smaller than the design dimensions shown in Fig. 26A. In the example shown in Fig. 26B, the force from the pressure unit 784 causes the roller heater 78 to extend in its entire length, and the roller 781 comes into contact with the lid 140.

[0342] Therefore, even if the dimensions of the lid body 140 fluctuate somewhat, the roller 781 can heat the exterior film 130 while continuing to press the exterior film 130 toward the side end surfaces 140B of the first lid body 140A and the second lid body with a sufficiently large force. This allows the exterior film 130 to be more stably joined to the side end surfaces G1. This prevents gaps from being formed between the exterior film 130 and the side end surfaces G1 of the first lid body 140A and the second lid body 140B, improving the sealing performance between the exterior film 130 and the side end surfaces G1 of the first lid body 140A and the second lid body 140B.

[0343] The pressure applying portion 784 is a member that is supported by the base end portion 783 and presses the tip end portion 782 along the extension / contraction direction D78. The specific configuration of the pressure applying portion 784 is not particularly limited. The pressure applying portion 784 may be an elastically deformable member. Examples of the pressure applying portion 784 include a fluid pressure cylinder such as an air cylinder, a damper mechanism, a spring such as a compression spring, and rubber.

[0344] An upper and lower limit may be set for the deformation resistance (N / mm) of the pressure applying portion 784. The deformation resistance is the magnitude of the force (N) required to shorten the pressure applying portion by 1 mm in the expansion / contraction direction D78. The deformation resistance is the resistance to elastic deformation and may also be called elastic deformation resistance. As an example, the deformation resistance of a spring is the spring constant. If the deformation resistance is large, the expansion length of the roller heater 78 when a constant force is applied will be small. If the deformation resistance is small, the expansion length of the roller heater 78 when a constant force is applied will be large.

[0345] The force with which the roller heater 78 presses the exterior film 130 toward the side end surface G1 changes as the length of the pressure section 784 changes in response to dimensional changes in the lid 140, etc. Setting an upper limit to the deformation resistance (N / mm) of the pressure section 784 makes it possible to reduce the amount of change in the force with which the roller heater 78 presses the exterior film 130 toward the side end surface G1. In other words, the variation in the force with which the roller heater 78 presses the exterior film 130 toward the side end surface G1 can be reduced, thereby improving the seal between the side end surfaces of the first and second lids and the exterior film.

[0346] The deformation resistance (N / mm) of the pressure member 784 may be 1.0 N / mm or less, 0.90 N / mm or less, or 0.80 N / mm or less.

[0347] The deformation resistance (N / mm) is measured using a force gauge and a displacement sensor. With the movement of the distal end 782 in the extension / contraction direction D78 restricted, the proximal end 783 is pressed in the extension / contraction direction D78 toward the distal end 782. At this time, the force gauge is used to measure the load (N) applied to the proximal end 783, and the displacement sensor is used to measure the displacement (mm) of the proximal end 783 in the extension / contraction direction D78. The deformation resistance is calculated based on Hooke's law: F (load) = k (deformation resistance) × t (displacement). More specifically, the deformation resistance is calculated by dividing F (load) by t (displacement).

[0348] The roller 781 of the roller heater 78 is pressed against the exterior film 130 so that the roller heater 78 can press the exterior film 130 against the side end surface G1 with a preset force. Therefore, the pressure unit 784 is used in a shortened state to a length corresponding to the preset force. By setting a lower limit for the deformation resistance, the amount of relative movement between the tip end 782 and the base end 783 required to apply a predetermined force, i.e., the amount of change in the overall length of the pressure unit 784, can be reduced. Therefore, the roller heater 78 can be made smaller and lighter.

[0349] The deformation resistance (N / mm) of the pressure portion 784 may be 0.10 N / mm or more, 0.20 N / mm or more, or 0.30 N / mm or more.

[0350] The deformation resistance (N / mm) of the pressure applying portion 784 may be 0.10 N / mm or more and 1.0 N / mm or less, 0.20 N / mm or more and 1.0 N / mm or less, or 0.30 N / mm or more and 1.0 N / mm or less. The deformation resistance (N / mm) of the pressure applying portion 784 may be 0.10 N / mm or more and 0.90 N / mm or less, 0.20 N / mm or more and 0.90 N / mm or less, or 0.30 N / mm or more and 0.90 N / mm or less. The deformation resistance (N / mm) of the pressure applying portion 784 may be 0.10 N / mm or more and 0.80 N / mm or less, 0.20 N / mm or more and 0.80 N / mm or less, or 0.30 N / mm or more and 0.80 N / mm or less.

[0351] 26A to 26C, one roller-type heater 78 may include a single roller 781. As shown in Figures 27A and 27B, one roller-type heater 78 may include multiple rollers 781. According to this example, the operation of the multiple rollers 781 can be controlled by operating one roller-type heater 78.

[0352] 27A and 27B, the tip portion 782 of the roller-type heater 78 includes a tip portion body 786 and a link portion 787. The tip portion body 786 is held relatively movably by the base end portion 783. A pressure portion 784 is provided between the tip portion body 786 and the base end portion 783. The link portion 787 is rotatably held by the tip portion body 786. The link portion 787 rotatably holds multiple rollers 781. The rotation axes A781 of the multiple rollers 781 are parallel to each other. The rotation axis A782 of the link portion 787 and the tip portion body 786 is parallel to the rotation axis A781 of the rollers 781. The rotation axis A782 of the link portion 787 and the tip portion body 786 is located between the rotation axes A781 of the two rollers 781. According to the example shown in Figures 27A and 27B, multiple rollers 781 held by one roller-type heater 78 can move smoothly over the corner G1X, and the exterior film 130 can be stably joined to the corner G1X.

[0353] As described above, the joining tool that joins the side end surface G1 and the exterior film 130 may be a joining tool including a roller 781 or may be a roller-type heater 78. The joining tool including a roller 781 and the roller-type heater 78 are also applicable to joining tools other than the joining tool that joins the side end surface G1 and the exterior film 130. The corner joining tool 75 may be formed by a joining tool including a roller 781. The corner joining tool 75 may be formed by a roller-type heater 78. The second joining device 90 may be formed by a joining tool including a roller 781. The second joining device 90 may be formed by a roller-type heater 78. The temporary joining device 53 may include a joining tool including a roller 781. The temporary joining device 53 may include a roller-type heater 78.

[0354] As another specific example, as shown in FIG. 28, the first bonding device 70 may include a lid heater 82. In the example shown in FIG. 28, the lid 140 includes a metal main body 140x. The lid heater 82 heats the main body 140x. By heating the main body 140x with the lid heater 82, the exterior film 130 and the lid 140 can be bonded more quickly and more stably. The lid 140 may be welded to the heat-fusible resin layer L3 of the exterior film 130. The lid 140 may be heat-sealed to the heat-fusible resin layer L3 of the exterior film 130.

[0355] 28, each of the first lid body 140A and the second lid body 140B includes a resin peripheral portion 140y located around the main body portion 140x. The lid body heater 82 may heat the main body portion 140x to a temperature equal to or lower than the melting point of the peripheral portion 140y. Since the exterior film 130 contacts the resin peripheral portion 140y, the exterior film 130 and the lid body 140 can be stably in contact with each other. Therefore, the exterior film 130 and the lid body 140 can be stably joined together.

[0356] The lid heater 82 is not particularly limited. The lid heater 82 may have various configurations capable of heating the main body portion 140x. The heated lid heater 82 may come into contact with the main body portion 140x, thereby heating the main body portion 140x. The lid heater 82 may be held by the fixing device 40. The lid heater 82 may constitute a part of the fixing device 40. The lid heater 82 may constitute the fixing restriction portion 41. The lid heater 82 constituting the fixing restriction portion 41 may come into contact with the main body portion 140x and heat the main body portion 140x while positioning the main body portion 140x.

[0357] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of joining the side end surface G1 to an exterior film 130 that is wrapped around the electrode unit 111 so as to contact each side end surface G1 of the first lid body 140A and the second lid body 140B. The first joining device 70 includes a joining tool that simultaneously presses the exterior film 130 against a pair of opposing surfaces of the side end surface G1 to join the exterior film 130 to the pair of surfaces. In the joining step, the joining tool simultaneously presses the exterior film 130 against the pair of opposing surfaces of the side end surface G1 to join the exterior film 130 to the pair of surfaces.

[0358] According to this embodiment, by simultaneously pressing the exterior film 130 against a pair of opposing surfaces of the side end surface G1, the exterior film 130 can be bonded to the pair of opposing surfaces in parallel. Furthermore, by simultaneously pressing the exterior film 130 against the pair of opposing surfaces of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to the pair of surfaces of the side end surface G1. As a result, the exterior film 130 and the side end surface G1 can be quickly and accurately bonded together.

[0359] In the specific example of the present embodiment described above, the first joining device 70 includes another joining tool that simultaneously presses the exterior film 130 against another pair of opposing surfaces of the side end surface G1 to join the exterior film 130 to the other pair of surfaces. According to this specific example, the exterior film 130 can be joined to the other pair of surfaces of the side end surface G1 more quickly. As a result, the exterior film 130 and the side end surface G1 can be joined more quickly.

[0360] In the specific example of the present embodiment described above, the connector simultaneously presses the exterior film 130 against a pair of surfaces and another pair of opposing surfaces of the side end surface G1, thereby joining the exterior film 130 to the pair of surfaces and the other pair of surfaces. According to this specific example, the exterior film 130 can be joined more quickly to the pair of surfaces of the side end surface G1 and the other pair of surfaces. As a result, the exterior film 130 can be joined to the side end surface G1 more quickly.

[0361] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of joining the side end surfaces G1 to an exterior film 130 that is wrapped around the electrode assembly unit 111 so as to contact the side end surfaces G1 of each of the first and second lid bodies 140A and 140B. The first lid body 140A, the electrode assembly 115, and the second lid body 140B are positioned in this order in a first direction D1. The side end surfaces G1 of each of the first and second lid bodies 140A and 140B include a first surface G11 and a fourth surface G14 that extend in a second direction D2 that is non-parallel to the first direction D1, and a second surface G12 and a third surface G13 that extend in a third direction D3 that is non-parallel to both the first direction D1 and the second direction D2. The first joining device 70 includes a joining tool that presses the exterior film 130 against the first surface G11 and the fourth surface G14 simultaneously, and joins the exterior film 130 to the first surface G11 and the fourth surface G14. In the joining step, the joining tool presses the exterior film 130 against the first surface G11 and the fourth surface G14 simultaneously, and joins the exterior film 130 to the first surface G11 and the fourth surface G14.

[0362] According to this embodiment, by simultaneously pressing the exterior film 130 against the first surface G11 and the fourth surface G14 of the side end surface G1, the exterior film 130 can be bonded in parallel to the opposing first surface G11 and fourth surface G14. Furthermore, by simultaneously pressing the exterior film 130 against the opposing first surface G11 and fourth surface G14 of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to a pair of surfaces of the side end surface G1. As a result, the exterior film 130 and the side end surface G1 can be quickly and accurately bonded together.

[0363] In the above-described specific example of this embodiment, the first joining device 70 includes another joining tool that presses the exterior film 130 against the second surface G12 and the third surface G13 simultaneously to join the exterior film 130 to the second surface G12 and the third surface G13. According to this specific example of this embodiment, the exterior film 130 can also be joined more quickly to the second surface G12 and the third surface G13 of the side end surface G1. As a result, the exterior film 130 and the side end surface G1 can be joined more quickly.

[0364] In the above-described specific example of the present embodiment, the first bonding device 70 presses the exterior film 130 against the first surface G11, the second surface G12, the third surface G13, and the fourth surface G14 simultaneously, and bonds the exterior film 130 to the first surface G11, the second surface G12, the third surface G13, and the fourth surface G14. According to this specific example of the present embodiment, the exterior film 130 can be more quickly bonded to the first surface G11, the second surface G12, the third surface G13, and the fourth surface G14 of the side end surface G1. As a result, the exterior film 130 can be more quickly bonded to the side end surface G1.

[0365] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of joining the exterior film 130 wrapped around the electrode unit 111 so as to contact the side end surface G1 of each of the first lid body 140A and the second lid body 140B to the side end surface G1. The first joining device 70 includes a front joining tool that presses the exterior film 130 against one surface of the side end surface G1 to join the exterior film 130 to that surface, and a rear joining tool that presses the exterior film 130 against the one surface after the front joining tool to join the exterior film 130 to that surface. The joining step includes a step of using the front joining tool to press the exterior film 130 against the one surface of the side end surface G1 to join the exterior film 130 to that surface, and a step that is performed after the joining step using the front joining tool, of using the rear joining tool to press the exterior film 130 against the one surface to join the exterior film 130 to that surface.

[0366] According to this embodiment, the exterior film 130 is joined to one surface of the side end surface G1 in two separate steps using a front joining tool and a rear joining tool. Therefore, one joining process can be completed in a short time. The exterior film 130 and the lid 140 are heated during joining processes such as heat sealing, ultrasonic joining, and high-frequency joining. During the joining process, the time required to heat the exterior film 130 and the lid 140 to a temperature suitable for processing is shorter than the time required for the electrode assembly 115 to be heated to a high temperature due to the heating of the exterior film 130 and the lid 140. Therefore, by dividing the process of joining one surface of the side end surface G1 to the exterior film 130 into two separate steps, the time during which the electrode assembly 115 is heated to a high temperature can be shortened. As a result, damage to the electrode assembly 115 due to heating during the joining of the exterior film 130 and the lid 140 can be suppressed. Furthermore, by shortening the time required for each joining process, the time required to join one surface of the side end surface G1 to the exterior film 130 can be suppressed. That is, it is possible to prevent the time required to bond the exterior film 130 and the side end surface G1 from becoming long, and also to prevent damage to the electrode body 115 when bonding the exterior film 130 and the side end surface G1.

[0367] In the above-described specific example of the present embodiment, the first joining device 70 includes another leading joining device that presses the exterior film 130 against another surface of the side end surface G1 to join the exterior film 130 to that other surface, and another trailing joining device that presses the exterior film 130 against the other surface after the other leading joining device to join the exterior film 130 to that other surface. According to this specific example of the present embodiment, the process of joining the exterior film 130 to one surface of the side end surface G1 and the process of joining the exterior film 130 to the other surface are each performed twice, thereby shortening the time during which the electrode body 115 is heated to a high temperature. As a result, damage to the electrode body 115 due to high-temperature heating during the joining of the exterior film 130 to the lid body 140 can be more effectively prevented.

[0368] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of joining the side end surfaces G1 to an exterior film 130 that is wrapped around the electrode assembly unit 111 so as to contact the side end surfaces G1 of each of the first and second lid bodies 140A and 140B. The first lid body 140A, the electrode assembly 115, and the second lid body 140B are positioned in this order in a first direction D1. The side end surfaces G1 of each of the first and second lid bodies 140A and 140B include a first surface G11 and a fourth surface G14 that extend in a second direction D2 that is non-parallel to the first direction D1, and a second surface G12 and a third surface G13 that extend in a third direction D3 that is non-parallel to both the first direction D1 and the second direction D2.

[0369] The first bonding device 70 of this manufacturing apparatus 20 is a first front joining tool 70AP that presses the exterior film 130 against the first surface G11 and joins the exterior film 130 to the first surface G11; a first posterior joining device 70AS that presses the exterior film 130 against the first surface G11 after the first front joining device 70AP and joins the exterior film 130 to the first surface G11; a second front joining tool 70BP that presses the exterior film 130 against the second surface G12 and joins the exterior film 130 to the second surface G12; a second posterior joining device 70BS that presses the exterior film 130 against the second surface G12 after the second front joining device 70BP and joins the exterior film 130 to the second surface G12; a third front joining tool 70CP that presses the exterior film 130 against the third surface G13 and joins the exterior film 130 to the third surface G13; a third posterior connector 70CS that presses the exterior film 130 against the third surface G13 after the third front connector 70CP and joins the exterior film 130 to the third surface G13; a fourth connector 70DP that presses the exterior film 130 against the fourth surface G14 and joins the exterior film 130 to the fourth surface G14; and a fourth posterior connector 70DS that presses the exterior film 130 against the fourth surface G14 after the fourth front connector 70DP, and joins the exterior film 130 to the fourth surface G14.

[0370] The joining step of this manufacturing method is as follows: a step of pressing the exterior film 130 against the first surface G11 using a first front joining tool 70AP and joining the exterior film 130 to the first surface G11; a step performed after the step of joining using the first front joining tool 70AP, in which the exterior film 130 is pressed against the first surface G11 using the first rear joining tool 70AS, and the exterior film 130 is joined to the first surface G11; a step of pressing the exterior film 130 against the second surface G12 using the second front joining tool 70BP and joining the exterior film 130 to the second surface G12; a step performed after the step of joining using the second front joining tool 70BP, in which the exterior film 130 is pressed against the second surface G12 using the second back joining tool 70BS, and the exterior film 130 is joined to the second surface G12; a step of pressing the exterior film 130 against the third surface G13 using the third front joining tool 70CP and joining the exterior film 130 to the third surface G13; a step performed after the step of joining using the third front joining tool 70CP, in which the exterior film 130 is pressed against the third surface G13 using the third back joining tool 70CS, and the exterior film 130 is joined to the third surface G13; a step of pressing the exterior film 130 against the fourth surface G14 using the fourth front joining tool 70DP and joining the exterior film 130 to the fourth surface G14; This is a process carried out after the process of joining using the fourth front joining device 70DP, and includes a process of pressing the exterior film 130 against the fourth surface G14 using the fourth back joining device 70DS to join the exterior film 130 to the fourth surface G14.

[0371] According to this embodiment, the exterior film 130 is joined to each of the first surface G11 to the fourth surface G14 in two separate steps using a front joining tool and a rear joining tool. Therefore, a single joining process for joining each surface G11 to G14 and the exterior film 130 can be completed in a short time. During joining processes such as heat sealing, ultrasonic joining, and high-frequency joining, the exterior film 130 and the lid 140 are heated. During the joining process, the time required to heat the exterior film 130 and the lid 140 to a temperature suitable for processing is shorter than the time required for the electrode assembly 115 to be heated to a high temperature due to the heating of the exterior film 130 and the lid 140. Therefore, by dividing the process of joining each surface G11 to G14 of the side end surface G1 to the exterior film 130 into two separate steps, the time during which the electrode assembly 115 is heated can be shortened. As a result, damage to the electrode assembly 115 due to high-temperature heating during the joining of the exterior film 130 and the lid 140 can be suppressed. Furthermore, by shortening the time for each joining step, it is possible to prevent the time required to join each of the surfaces G11 to G14 of the side end face G1 to the exterior film 130 from becoming too long. That is, it is possible to prevent the time required to join the exterior film 130 to the side end face G1 from becoming too long, while also preventing damage to the electrode body 115 when joining the exterior film 130 to the side end face G1.

[0372] In the specific example of this embodiment described above, the first front connector 70AP and the fourth front connector 70DP simultaneously press the exterior film 130 against the side end surface G1. The first rear connector 70AS and the fourth rear connector 70DS simultaneously press the exterior film 130 against the side end surface G1. The second front connector 70BP and the third front connector 70CP simultaneously press the exterior film 130 against the side end surface G1. The second rear connector 70BS and the third rear connector 70CS simultaneously press the exterior film 130 against the side end surface G1. According to this specific example, by simultaneously pressing the exterior film 130 against the first surface G11 and the fourth surface G14 of the side end surface G1, the exterior film 130 can be joined in parallel to the opposing first surface G11 and fourth surface G14. Furthermore, by simultaneously pressing the exterior film 130 against the opposing first surface G11 and fourth surface G14 of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. By simultaneously pressing the exterior film 130 against the second surface G12 and third surface G13 of the side end surface G1, the exterior film 130 can be bonded in parallel to the opposing second surface G12 and third surface G130. Furthermore, by simultaneously pressing the exterior film 130 against the opposing second surface G12 and third surface G13 of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to the first surface G11 to fourth surface G14 of the side end surface G1. As a result, the exterior film 130 and the side end surface G1 can be bonded quickly and with high precision.

[0373] In the specific example of this embodiment described above, the first front connector 70AP, the second front connector 70BP, the third front connector 70CP, and the fourth front connector 70DP simultaneously press the exterior film 130 against the side end surface G1. The first rear connector 70AS, the second rear connector 70BS, the third rear connector 70CS, and the fourth rear connector 70DS simultaneously press the exterior film 130 against the side end surface G1. According to the specific example of this embodiment, by simultaneously pressing the exterior film 130 against the first surface G11 to the fourth surface G14 of the side end surface G1, the exterior film 130 can be joined in parallel to the opposing first surface G11 to the fourth surface G14. Furthermore, by simultaneously pressing the exterior film 130 against the opposing first surface G11 to the fourth surface G14 of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to the first surface G11 to the fourth surface G14 of the side end surface G1. As a result, the exterior film 130 and the side end surface G11 can be quickly and accurately bonded together.

[0374] In the specific example of this embodiment described above, the joining process using the first front connector 70AP, the joining process using the second front connector 70BP, the joining process using the third front connector 70CP, and the joining process using the fourth front connector 70DP are performed in parallel. The joining process using the first rear connector 70AS, the joining process using the second rear connector 70BS, the joining process using the third rear connector 70CS, and the joining process using the fourth rear connector 70DS are performed in parallel. According to this specific example, by simultaneously pressing the exterior film 130 against the first surface G11 to the fourth surface G14 of the side end surface G1, the exterior film 130 can be joined in parallel to the opposing first surface G11 to the fourth surface G14. Furthermore, by simultaneously pressing the exterior film 130 against the opposing first surface G11 to the fourth surface G14 of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to the first surface G11 to the fourth surface G14 of the side end surface G1. As a result, the exterior film 130 and the side end surface G11 can be quickly and accurately bonded together.

[0375] The specific example of the present embodiment described above includes a plurality of corner connectors 75 that simultaneously press the exterior film 130 against two or more corners G1X included in the side end surface G1 to join the exterior film 130 to the two or more corners G1X. Poor joining between the first lid body 140A and the second lid body 140B and the exterior film 130 may occur at the corners G1X of the side end surface G1. According to this specific example, the corner connectors 75 can locally join the portions of the exterior film 130 located at the corners G1X. Therefore, the first lid body 140A and the second lid body 140B and the exterior film 130 can be stably joined at the corners G1X. This prevents gaps from being generated between the side end surfaces G1 of the first lid body 140A and the second lid body 140B and the exterior film 130, improving the sealing performance between the side end surfaces G1 of the first lid body 140A and the second lid body 140B and the exterior film 130. Moreover, excessive heating of the exterior film 130 as a whole can be prevented, thereby suppressing damage to the exterior film 130 and the electrode body 115. In particular, according to this specific example, by simultaneously pressing the exterior film 130 against two or more corners G1X, the exterior film 130 can be joined to two or more corners G1X in parallel. Furthermore, by simultaneously pressing the exterior film 130 against two or more corners G1X, the posture of the electrode body unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably joined to two or more corners G1X. As a result, the exterior film 130 and the side end surface G1 can be joined quickly and with high precision.

[0376] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of joining an exterior film 130 wrapped around the electrode unit 111 so as to contact the side end surface G1 of each of the first lid body 140A and the second lid body 140B to the side end surface G1. The first joining device 70 includes a plurality of corner joints 75 that simultaneously press the exterior film 130 against two or more corners G1X included in the side end surface G1 to join the exterior film 130 to the two or more corners G1X. In the joining step, the plurality of corner joints 75 simultaneously press the exterior film 130 against two or more corners G1X included in the side end surface G1 to join the exterior film 130 to the two or more corners G1X.

[0377] Poor bonding between the first and second lid bodies 140A and 140B and the exterior film 130 can occur at the corners G1X of the side end surfaces G1. According to the present embodiment, the corner connectors 75 can locally bond the portions of the exterior film 130 located on the corners G1X. Therefore, the first and second lid bodies 140A and 140B and the exterior film 130 can be stably bonded at the corners G1X. By preventing gaps from being generated between the side end surfaces G1 of the first and second lid bodies 140A and 140B and the exterior film 130, the sealing performance between the side end surfaces G1 of the first and second lid bodies 140A and 140B and the exterior film 130 can be improved. Furthermore, by preventing the exterior film 130 from being overheated overall, damage to the exterior film 130 and the electrode assembly 115 can be suppressed. In particular, according to this embodiment, by using multiple corner connectors 75 to simultaneously press the exterior film 130 against two or more corners G1X, the exterior film 130 can be joined to two or more corners G1X in parallel. Furthermore, by simultaneously pressing the exterior film against two or more corners G1X, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably joined to two or more corners G1X. As a result, the exterior film 130 and the side end surface G1 can be joined quickly and with high precision.

[0378] In the specific example of the present embodiment described above, the first lid 140A, the electrode assembly 115, and the second lid 140B are positioned in this order in the first direction D1. The side end surfaces G1 of each of the first lid 140A and the second lid 140B include a first surface G11 and a fourth surface G14 extending in a second direction D2 non-parallel to the first direction D1, and a second surface G12 and a third surface G13 extending in a third direction D3 non-parallel to both the first direction D1 and the second direction D2. The multiple corner connectors 75 simultaneously press the exterior film 130 against two diagonally adjacent corners G1X to join the exterior film 130 to the two corners G1X. According to this specific example, the multiple corner connectors 75 simultaneously press the exterior film 130 against the two diagonally adjacent corners G1X, thereby joining the exterior film 130 to the two corners G1X in parallel. The two corners G1X against which the exterior film 130 is pressed simultaneously are located diagonally, which makes it possible to more stably maintain the posture of the electrode unit 111. As a result, the exterior film 130 and the side end surface G1 can be joined with higher precision.

[0379] In the specific example of the present embodiment described above, the multiple corner connectors 75 simultaneously press the exterior film 130 against all corners G1X included in the side end surface G1, thereby joining the exterior film 130 to all corners G1X. According to this specific example, by simultaneously pressing the exterior film 130 against all corners G1X using the multiple corner connectors 75, the exterior film 130 can be joined to all corners G1X in parallel. Because the exterior film 130 is pressed against all corners G1X simultaneously, the posture of the electrode unit 111 can be maintained more stably. As a result, the exterior film 130 and the side end surface G1 can be joined more quickly and with greater precision.

[0380] In the specific example of the present embodiment described above, the first lid body 140A, the electrode assembly 115, and the second lid body 140B are positioned in this order in the first direction D1. The side end face G1 of each of the first lid body 140A and the second lid body 140B includes a first face G11 and a fourth face G14 extending in a second direction D2 non-parallel to the first direction D1, and a second face G12 and a third face G13 extending in a third direction D3 non-parallel to both the first direction D1 and the second direction D2. The side end face G1 includes four corners G1X. The multiple corner connectors 75 include four corner connectors 75 that simultaneously press the exterior film 130 against the four corners G1X and join the exterior film 130 to the four corners G1X. According to this example, the exterior film 130 can be joined to all the corners G1X in parallel by simultaneously pressing the exterior film 130 against the four corners G1X using multiple corner connectors 75. Because the exterior film 130 is pressed against the four corners G1X simultaneously, the posture of the electrode unit 111 can be maintained more stably. As a result, the exterior film 130 and the side end surface G1 can be joined more quickly and with higher precision.

[0381] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of bonding the exterior film 130, which is wrapped around the electrode unit 111 so as to contact the side end surface G1 of each of the first lid body 140A and the second lid body 140B, to the side end surface G1. The first bonding device 70 includes a plurality of rotatable rollers 781 each having a heated outer circumferential surface 781x. The plurality of rollers 781 simultaneously press the exterior film 130 against the side end surface G1 to bond the exterior film 130 to the side end surface G1. In the bonding step, the plurality of rollers 781 simultaneously press the exterior film 130 against the side end surface G1 to bond the exterior film 130 to the side end surface.

[0382] According to this embodiment, the exterior film 130 can be bonded to the side end surface G1 at multiple positions in parallel by simultaneously pressing the exterior film 130 against multiple positions on the side end surface G1 using multiple rollers 781. Therefore, the exterior film 130 can be bonded to the side end surface G1 quickly.

[0383] In the specific example of the present embodiment described above, the multiple rollers 781 simultaneously press the exterior film 130 against different surfaces of the side end surface G1. According to this specific example, by using the multiple rollers 781 to simultaneously press the exterior film 130 against different surfaces of the side end surface G1, the multiple surfaces of the side end surface G1 can be bonded to the exterior film 130 in parallel. Therefore, the exterior film 130 can be quickly bonded to the side end surface G1.

[0384] In the specific example of the present embodiment described above, the multiple rollers 781 simultaneously press the exterior film 130 against each of the pair of opposing surfaces of the side end surface G1. According to this specific example, by using the multiple rollers 781 to simultaneously press the exterior film 130 against the pair of opposing surfaces of the side end surface G1, the pair of surfaces of the side end surface G1 and the exterior film 130 can be bonded in parallel. Furthermore, by simultaneously pressing the exterior film 130 against the pair of opposing surfaces of the side end surface G1, the posture of the electrode unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to the pair of surfaces of the side end surface G1. As a result, the exterior film 130 and the side end surface G1 can be quickly and accurately bonded together.

[0385] In the specific example of the present embodiment described above, the multiple rollers 781 press the exterior film 130 against the same surface of the side end surface G1. According to this specific example, by using the multiple rollers 781 to simultaneously press the exterior film 130 against multiple positions on one surface of the side end surface G1, it is possible to proceed with joining the one surface and the exterior film 130 at multiple positions on the one surface. Therefore, the side end surface G1 and the exterior film 130 can be more reliably joined on one surface. Furthermore, the exterior film 130 and the side end surface G1 can be joined quickly.

[0386] In the present embodiment described above, the manufacturing apparatus 20 and manufacturing method manufacture an energy storage element intermediate 110 using an electrode body unit 111 and an exterior film 130 wrapped around the electrode body unit. The electrode body unit 111 includes a first lid body 140A, a second lid body 140B, and an electrode body 115 located between the first lid body 140A and the second lid body 140B. The energy storage element intermediate 110 includes an exterior body 120 including the first lid body 140A, the second lid body 140B, and an exterior film 130, and the electrode body 115 housed in the exterior body 120. The manufacturing apparatus 20 includes a first bonding device 70. The first bonding device 70 bonds the exterior film 130 wrapped around the electrode body unit 111 to the side end surface G1 of the first lid body 140A and the second lid body 140B so as to contact each of the side end surfaces G1. The manufacturing method includes a step of joining the side end surface G1 to an exterior film 130 wrapped around the electrode unit 111 so as to contact the side end surface G1 of each of the first and second lid bodies 140A and 140B. Each of the first and second lid bodies 140A and 140B includes a metal main body 140x. The first joining device 70 includes a lid heater 82 that heats the main body 140x and a joining tool that heats the exterior film 130 while pressing it against the side end surface G1. In the joining step, the lid heater 82 heats the main body 140x, and the joining tool heats the exterior film 130 while pressing it against the side end surface G1.

[0387] According to this embodiment, the exterior film 130 and the lid 140 can be heated by the joining tool, and the main body 140x of the lid 140 can be heated by the lid heater 82. Therefore, the exterior film 130 and the lid 140 can be heated to a temperature suitable for joining in a short time. As a result, the exterior film 130 and the side end surface G1 can be joined quickly and with high precision.

[0388] In the above-described specific example of the present embodiment, each of the first lid body 140A and the second lid body 140B includes a resin peripheral portion 140y located around the main body portion 140x. The lid body heater 82 heats the main body portion 140x to a temperature equal to or lower than the melting point of the peripheral portion 140y. According to this specific example, the periphery of the metal main body portion 140x is covered with the resin peripheral portion 140y. The lid body heater 82 heats the main body portion 140x to a temperature equal to or lower than the melting point of the peripheral portion 140y. Since the exterior film 130 contacts the resin peripheral portion 140y, stable contact between the exterior film 130 and the lid body 140 is possible. As a result, stable bonding between the exterior film 130 and the side end surface G1 is possible.

[0389] In the above-described specific example of the present embodiment, the first joining device 70 includes a plurality of corner connectors 75 that simultaneously press the exterior film 130 against two or more corners G1X included in the side end surface G1 to heat the exterior film 130. Poor joining between the first lid body 140A and the second lid body 140B and the exterior film 130 can occur at the corners G1X of the side end surface G1. According to this specific example, the corner connectors 75 can locally join the portions of the exterior film 130 located at the corners G1X. Therefore, the first lid body 140A and the second lid body 140B and the exterior film 130 can be stably joined at the corners G1X. This prevents gaps from being generated between the side end surfaces G1 of the first lid body 140A and the second lid body 140B and the exterior film 130, improving the sealing performance between the side end surfaces G1 of the first lid body 140A and the second lid body 140B and the exterior film 130. Moreover, excessive heating of the exterior film 130 and the electrode assembly 115 as a whole can be prevented, thereby suppressing damage to the exterior film 130 and the electrode assembly 115. In particular, according to this specific example, by simultaneously pressing the exterior film 130 against two or more corners G1X, the exterior film 130 can be bonded to two or more corners G1X in parallel. Furthermore, by simultaneously pressing the exterior film 130 against two or more corners G1X, the posture of the electrode assembly unit 111 can be stably maintained. Therefore, the exterior film 130 can be quickly and stably bonded to two or more corners G1X. As a result, the exterior film 130 and the side end surface G1 can be bonded quickly and with high precision.

[0390] Although the present embodiment has been described with reference to several specific examples, the present embodiment is not limited to these specific examples. The present embodiment described above can be implemented with various other specific examples, and various omissions, substitutions, changes, additions, etc. can be made without departing from the spirit of the present invention.

[0391] In the above specific example, the lid 140 and the exterior film 130 are joined by heat sealing. The joining of the lid 140 and the exterior film 130 is not limited to heat sealing. The lid 140 and the exterior film 130 may be joined by a method other than heat sealing. The joining of the lid 140 and the exterior film 130 may be welding other than heat sealing. Examples of welding other than heat sealing include ultrasonic welding and high-frequency welding. In this example, the joining tools of the first joining device 70 and the temporary joining device 53 may be vibration devices that apply vibration or pressure and vibration. The joining of the lid 140 and the exterior film 130 may be brazing. Examples of brazing bonding include bonding using an adhesive or solder.

[0392] In the specific example described above, the pair of extension portions 132A, 132B are joined by heat sealing. The joining of the pair of extension portions 132A, 132B is not limited to heat sealing. The pair of extension portions 132A, 132B may be joined by a method other than heat sealing. The pair of extension portions 132A, 132B may be joined by welding other than heat sealing. Examples of welding other than heat sealing include ultrasonic welding and high-frequency welding. In this example, the second joining device 90 may be a vibration device that applies vibration or pressure and vibration. The joining of the extension portions 132A, 132B may be brazing. Examples of brazing bonding include bonding using an adhesive or solder.

[0393] In the above specific example, the cover 140 has a rectangular shape when viewed from the first direction D1, but is not limited to this example. As already described, the cover 140 may have a circular shape, an elliptical shape, a square shape, a diamond shape, or a polygonal shape other than a rectangle when viewed from the first direction D1.

[0394] In the above-described specific example, the side end surface G1 of the rectangular lid body 140 includes a first side end surface G11, a second side end surface G12, a third side end surface G13, and a fourth side end surface G14. The first side end surface G11 and the fourth side end surface G14 face each other to form the long sides of the rectangle. The second side end surface G12 and the third side end surface G13 face each other to form the short sides of the rectangle. This example is not limiting, and the first side end surface G11 and the fourth side end surface G14 may face each other to form the short sides of the rectangle. The second side end surface G12 and the third side end surface G13 may face each other to form the long sides of the rectangle.

[0395] Furthermore, the first side end face in the claims is not limited to the first side end face G11 in this embodiment, but may be the second side end face G12, the third side end face G13, or the fourth side end face G14. Similarly, the second side end face in the claims is not limited to the second side end face G12 in this embodiment, but may be the first side end face G11, the third side end face G13, or the fourth side end face G14. Similarly, the third side end face in the claims is not limited to the third side end face G13 in this embodiment, but may be the first side end face G11, the second side end face G12, or the fourth side end face G14. Similarly, the fourth side end face in the claims is not limited to the fourth side end face G14 in this embodiment, but may be the first side end face G11, the second side end face G12, or the third side end face G13. [Explanation of symbols]

[0396] 100: energy storage element, 110: energy storage element intermediate body, 111: electrode body unit, 113: lid unit, 113A: first lid unit, 113B: second lid unit, 115: electrode body, 117: terminal, 117A: first terminal, 117B: second terminal, 120: exterior body, 130: exterior film, 131A: first part, 131B: second part, 131C: third part, 131D: fourth part, 132A: first extension part, 132B: second extension part, 140: lid, 140A: first lid, 140B: second lid, 141: through hole, 140x: main body part, 140y: peripheral part D1: first direction, D2: second direction, D3: third direction, K1: first opening, K2: second opening, S1: opening seal portion, S11: first seal portion, S12: second seal portion, S13: third seal portion, S14: fourth seal portion, S2: extended seal portion, S2X: unsealed portion, L1: base material layer, L2: barrier layer, L3: heat-sealable resin layer, L4: adhesive layer, L5: adhesive layer, A1: first side edge portion, A2: second side edge portion, B1: first end portion, B2: second end portion, G2: outer main surface, G3: inner main surface, G1: side end surface, G11: first surface, G12: second surface, G13: third surface, G14: fourth surface, G1X: corner portion 10: Manufacturing device, 15: Injection device, 20: Manufacturing device, 29: Film holding unit, 40: Fixing device, 41: Fixing regulation unit, 42: Fixing drive unit, 50: Winding device, 53: Temporary joining device, 53A: First temporary joining device, 53B: Second temporary joining device, 53C: Third temporary joining device, 53D: Fourth temporary joining device, 53E: Fifth temporary joining device, 70A: First joining device, 70B: Second joining device, 70C: Third joining device, 70D: Fourth joining device, 70AP: First leading joining device, 70AS: First trailing joining device, 70BP: Second leading joining device, 70 BS: second rear connector, 70CP: third front connector, 70CS: third rear connector, 70DP: fourth front connector, 70DS: fourth rear connector, 75: corner connector, 78: roller type heater, 781: roller, 781A: first roller, 781B: second roller, 781C: third roller, 781D: fourth roller, 781x: outer periphery, 782: tip portion, 783: base end portion, 784: pressure portion, 786: tip portion main body, 787: link portion, 82: lid body heater, 90: second connector, 91: film connector D78: Extension direction, A781: Rotation axis, A782: Rotation axis

Claims

1. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device is a manufacturing apparatus including a joining tool that simultaneously presses the exterior film against a pair of opposing surfaces of the side end faces to join the exterior film to the pair of surfaces.

2. The manufacturing apparatus according to claim 1 , wherein the joining device includes another joining tool that simultaneously presses the exterior film against another pair of opposing surfaces of the side end surface to join the exterior film to the other pair of surfaces.

3. The manufacturing apparatus according to claim 1, wherein the joining tool simultaneously presses the exterior film against the pair of surfaces and another pair of surfaces opposing the side end surface, thereby joining the exterior film to the pair of surfaces and the other pair of surfaces.

4. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The joining device includes a joining tool that presses the exterior film against the first surface and the fourth surface simultaneously to join the exterior film to the first surface and the fourth surface.

5. The manufacturing apparatus according to claim 4 , wherein the joining device includes another joining tool that presses the exterior film against the second surface and the third surface simultaneously to join the exterior film to the second surface and the third surface.

6. The manufacturing apparatus according to claim 4, wherein the joining tool presses the exterior film against the first surface, the second surface, the third surface, and the fourth surface simultaneously to join the exterior film to the first surface, the second surface, the third surface, and the fourth surface.

7. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device is a manufacturing apparatus that includes a front joining tool that presses the exterior film against one of the side end surfaces to join the exterior film to the one surface, and a rear joining tool that presses the exterior film against the one surface after the front joining tool to join the exterior film to the one surface.

8. The manufacturing apparatus described in claim 7, wherein the joining device includes another front joining device that presses the exterior film against another surface of the side end face to join the exterior film to the other surface, and another back joining device that presses the exterior film against the other surface after the other front joining device to join the exterior film to the other surface.

9. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The joining device is A first joining tool that presses the exterior film against the first surface to join the exterior film to the first surface; a first posterior joining tool that presses the exterior film against the first surface after the first front joining tool to join the exterior film to the first surface; A second front joining tool that presses the exterior film against the second surface to join the exterior film to the second surface; A second posterior joining tool that presses the exterior film against the second surface after the second front joining tool to join the exterior film to the second surface; A third joining tool that presses the exterior film against the third surface and joins the exterior film to the third surface; a third post-joining tool that presses the exterior film against the third surface after the third front-joining tool to join the exterior film to the third surface; A fourth joining tool that presses the exterior film against the fourth surface to join the exterior film to the fourth surface; A manufacturing apparatus comprising: a fourth posterior joining device that presses the exterior film against the fourth surface after the fourth front joining device to join the exterior film to the fourth surface.

10. The first end connector and the fourth end connector simultaneously press the exterior film against the side end surface, The first rear connector and the fourth rear connector simultaneously press the exterior film against the side end surface, The second end connector and the third end connector simultaneously press the exterior film against the side end surface, The manufacturing apparatus according to claim 9 , wherein the second rear connector and the third rear connector simultaneously press the exterior film against the side end surface.

11. The first end connector, the second end connector, the third end connector, and the fourth end connector simultaneously press the exterior film against the side end surface, The manufacturing apparatus according to claim 9 , wherein the first rear connector, the second rear connector, the third rear connector, and the fourth rear connector simultaneously press the exterior film against the side end surface.

12. The joining device includes a plurality of corner joining devices that simultaneously press the exterior film against two or more corners included in the side end surface and join the exterior film to the two or more corners. A manufacturing apparatus described in any one of claims 1 to 11.

13. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, The joining device is a manufacturing apparatus that includes a plurality of corner joining tools that simultaneously press the exterior film against two or more corners included in the side end surface and join the exterior film to the two or more corners.

14. the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The manufacturing apparatus according to claim 13 , wherein the plurality of corner connectors simultaneously press the exterior film against two corners that are diagonally opposite each other, thereby joining the exterior film to the two corners.

15. The manufacturing device according to claim 13 , wherein the plurality of corner connectors simultaneously press the exterior film against all corners included in the side end surface to join the exterior film to all of the corners.

16. the first cover, the electrode body, and the second cover are positioned in this order in a first direction; the side end surfaces of the first lid body and the second lid body each include a first surface and a fourth surface extending in a second direction non-parallel to the first direction, and a second surface and a third surface extending in a third direction non-parallel to both the first direction and the second direction, The side end surface includes four corners, The manufacturing apparatus according to claim 13, wherein the plurality of corner connectors include four corner connectors that simultaneously press the exterior film against the four corners and join the exterior film to the four corners.

17. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, the bonding device includes a plurality of rotatable rollers having heated outer circumferential surfaces; The manufacturing device wherein the plurality of rollers simultaneously press the exterior film against the side end surfaces to bond the exterior film to the side end surfaces.

18. The manufacturing apparatus according to claim 17 , wherein the plurality of rollers simultaneously press the exterior film against different sides of the side end surface.

19. The manufacturing apparatus according to claim 17 , wherein the plurality of rollers simultaneously press the exterior film against each of a pair of opposing side end surfaces.

20. The manufacturing apparatus according to claim 17 , wherein the plurality of rollers press the exterior film against the same side end surface.

21. an electrode body unit including a first lid body, a second lid body, and an electrode body located between the first lid body and the second lid body; an exterior film wrapped around the electrode unit, a manufacturing apparatus for manufacturing an energy storage element intermediate including an exterior body including the first lid body, the second lid body, and the exterior film, and the electrode body housed in the exterior body, a joining device that joins the exterior film wrapped around the electrode unit so as to come into contact with each side end surface of the first lid body and the second lid body to the side end surface, each of the first lid and the second lid includes a metal main body; The joining device is a manufacturing device including a lid heater that heats the main body portion, and a joining tool that heats the exterior film while pressing it against the side end surface.

22. each of the first lid and the second lid includes a peripheral portion made of resin and positioned around the main body; The manufacturing apparatus according to claim 21 , wherein the lid heater heats the main body to a temperature equal to or lower than the melting point of the peripheral portion.

23. The manufacturing apparatus according to any one of claims 17 to 22, wherein the joining device includes a plurality of corner joining tools that simultaneously press the exterior film against two or more corners included in the side end surface to heat the exterior film.

24. An apparatus for manufacturing an electric storage element intermediate according to claim 1, 4, 7, 9, 13, 17, or 21; an injection device that injects an electrolyte into the energy storage element intermediate.

25. A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to claim 1, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the joining tool simultaneously presses the exterior film against a pair of opposing surfaces of the side end faces to join the exterior film to the pair of surfaces.

26. A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to claim 4, comprising: a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the joining tool presses the exterior film against the first surface and the fourth surface simultaneously to join the exterior film to the first surface and the fourth surface.

27. A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to claim 7, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, The joining step includes: a step of pressing the exterior film against the one surface of the side end surface using the tip joining tool to join the exterior film to the one surface; A manufacturing method including a step carried out after the step of joining using the front joining tool, in which the rear joining tool is used to press the exterior film against the one surface and join the exterior film to the one surface.

28. A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to claim 9, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, The joining step includes: A step of pressing the exterior film against the first surface using the first front joining tool to join the exterior film to the first surface; A step performed after the step of joining using the first front joining tool, wherein the first rear joining tool is used to press the exterior film against the first surface to join the exterior film to the first surface; A step of pressing the exterior film against the second surface using the second front joining tool to join the exterior film to the second surface; A step performed after the step of joining using the second front joining tool, wherein the exterior film is pressed against the second surface using the second rear joining tool to join the exterior film to the second surface; A step of pressing the exterior film against the third surface using the third front joining tool to join the exterior film to the third surface; A step performed after the step of joining using the third front joining tool, wherein the third rear joining tool is used to press the exterior film against the third surface to join the exterior film to the third surface; A step of pressing the exterior film against the fourth surface using the fourth end joining tool to join the exterior film to the fourth surface; A manufacturing method comprising: a step carried out after the step of joining using the fourth front joining device, in which the exterior film is pressed against the fourth surface using the fourth rear joining device to join the exterior film to the fourth surface.

29. The step of joining using the first end connector, the step of joining using the second end connector, the step of joining using the third end connector, and the step of joining using the fourth end connector are carried out in parallel, 29. The manufacturing method of claim 28, wherein the steps of joining using the first rear fastener, joining using the second rear fastener, joining using the third rear fastener, and joining using the fourth rear fastener are performed in parallel.

30. A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to claim 13, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, a plurality of corner connectors simultaneously press the exterior film against two or more corners included in the side end surface, thereby joining the exterior film to the two or more corners.

31. A manufacturing method for manufacturing the energy storage element intermediate using the manufacturing apparatus according to claim 17, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the plurality of rollers simultaneously press the exterior film against the side end surfaces to join the exterior film to the side end surfaces.

32. A manufacturing method for manufacturing the electric storage element intermediate using the manufacturing apparatus according to claim 21, a step of joining the exterior film wrapped around the electrode unit so as to contact the side end surfaces of the first lid body and the second lid body, In the joining step, the lid heater heats the main body portion, and the joining tool heats the exterior film while pressing it against the side end surface.

33. A step of producing an electric storage element intermediate by the production method according to any one of claims 25 to 32; and injecting an electrolyte solution into the energy storage element intermediate.

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