Power storage device and method for manufacturing same

Abstract

Provided are a power storage device having high conduction reliability and a method for manufacturing the same. According to the present invention, provided is a method for manufacturing a power storage device (100) provided with an electrode body (20), a case (10), a first electrode terminal (30) attached to a bottom wall (12a) of the case (10), and a separator (80). The manufacturing method includes the steps of: integrating a first collector member (50) attached to an electrode body (20) with a separator (80); inserting the electrode body (20) in an integrated state with the separator (80) into the interior of the case main body (12); and joining the first collector member (50) and the first electrode terminal (30).

Description

Technical Field

[0001] This invention relates to energy storage devices and their manufacturing methods. Background Technology

[0002] Chinese Utility Model No. 219017869 discloses an energy storage device comprising an electrode body including a first electrode and a second electrode, a housing housing the electrode body, and a first electrode terminal electrically connected to the first electrode and mounted on the bottom wall of the housing. Chinese Utility Model No. 219017869 describes a technique for joining the electrode tab (first current collector) disposed on the first electrode to the first electrode terminal within the housing by welding or the like.

[0003] Patent Document 1: Chinese Utility Model No. 219017869 Specification

[0004] If the first electrode terminal is installed on the bottom wall of the housing, it is difficult to stably connect the first current collector and the first electrode terminal within the housing when they are joined, resulting in a high degree of difficulty in connection. Therefore, there is a need for a power storage device that can stably connect the first current collector and the first electrode terminal to achieve high reliability in conduction. Summary of the Invention

[0005] The present invention was made in view of the above circumstances, and its main objective is to provide an energy storage device with high conductivity reliability.

[0006] According to the present invention, a method for manufacturing an energy storage device is provided. Specifically, a method for manufacturing an energy storage device, wherein the energy storage device comprises: an electrode body including a first electrode and a second electrode; a housing housing the electrode body; and a first electrode terminal electrically connected to the first electrode via a first current collector, wherein the housing comprises: a bottomed cylindrical housing body having a bottom wall, a side wall disposed on the outer periphery of the bottom wall, and an opening opposite the bottom wall; and a sealing plate sealing the opening of the housing body, wherein the first electrode terminal is mounted on the bottom wall of the housing body. The device further includes a spacer disposed between the bottom wall and the electrode body. The manufacturing method of the energy storage device includes: an assembly step in which the spacer is disposed at one end of the electrode body on one side where the first current collector is mounted, and the first current collector and the spacer are integrated; an insertion step in which the electrode body, which is integrated with the spacer, is inserted into the interior of the housing body from one end; and a joining step in which the first current collector and the first electrode terminal are joined after the insertion step.

[0007] According to the above method, the first current collector and the first electrode terminal can be stably connected, thereby improving the conductivity reliability of the connection. Furthermore, a highly reliable energy storage device can be realized. Attached Figure Description

[0008] Figure 1 This is a perspective view schematically illustrating an energy storage device according to one embodiment.

[0009] Figure 2 It is along Figure 1 A schematic longitudinal section view of line II-II.

[0010] Figure 3 yes Figure 2 A magnified view of the main part.

[0011] Figure 4 It is along Figure 1 A schematic longitudinal section view of line IV-IV.

[0012] Figure 5 This is a schematic diagram showing the structure of the electrode.

[0013] Figure 6 It is a schematic representation of the exploded three-dimensional diagram of the composite object.

[0014] Figure 7A It is a schematic top view representing the isolated object.

[0015] Figure 7B It is a schematic three-dimensional representation of the isolated object.

[0016] Figure 8A This is an explanatory diagram of the insertion process.

[0017] Figure 8B This is a magnified view of the area near the positive terminal, which is the main part.

[0018] Figure 9 This is an explanatory diagram of the joining process.

[0019] Figure 10 This is an explanatory diagram of the assembly process involved in the first variation.

[0020] Figure 11 This is an explanatory diagram of the assembly process involved in the second variation.

[0021] Figure 12 This is a magnified view of the area near the positive terminal in the modified example.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10…shell; 12…shell body; 12a…bottom wall; 12p…protrusion; 14…sealing plate; 20…electrode body; 22…positive electrode (first electrode / second electrode); 24…negative electrode (first electrode / second electrode); 30…positive terminal (first electrode terminal); 40…negative terminal; 50…positive current collector (first current collector); 51…flange; 51r…fitting recess; 52…shaft; 60…negative current collector; 80, 180, 280…isolated parts; 85, 185…positive side support; 86, 186…negative side support; 85h, 86h, 185h, 186h…through hole; 85s, 86s…stepped part (recess); 85c…fitting protrusion; 87…hole; 100…energy storage device. Detailed Implementation

[0024] Hereinafter, some preferred embodiments of the technology disclosed herein will be described with reference to the accompanying drawings. Furthermore, matters requiring the implementation of the technology disclosed herein, other than those specifically mentioned in this specification (e.g., the general structure and manufacturing process of energy storage devices that do not characterize the technology disclosed herein), can be grasped by those skilled in the art based on prior art. The technology disclosed herein can be implemented based on the content disclosed in this specification and common technical knowledge in the field. Additionally, the designation "A~B" indicating ranges in this specification means "above A and below B" and also includes the meanings "beyond A" and "below B".

[0025] [Electronic storage device]

[0026] Figure 1 This is a perspective view schematically illustrating an embodiment of an energy storage device 100. Figure 2 It is along Figure 1 A schematic longitudinal section view of line II-II. Figure 3 yes Figure 2 A magnified view of the main part. Figure 4 It is along Figure 1 A schematic longitudinal sectional view along line IV-IV. Furthermore, in the following description, the reference numerals L, R, F, Rr, U, and D in the figures represent left, right, front, rear, top, and bottom, respectively. Additionally, the reference numeral X in the figures indicates the short side direction (thickness direction) of the energy storage device 100, the reference numeral Y indicates the long side direction of the energy storage device 100 orthogonal to the short side direction, and the reference numeral Z indicates the vertical direction of the energy storage device 100. The vertical direction Z can be the same as the vertical direction. However, these are directions only for ease of explanation and do not limit the arrangement of the energy storage device 100 in any way.

[0027] Furthermore, in this specification, "energy storage device" refers to the entire device capable of repeated charging and discharging through the movement of charge carriers between the positive and negative electrodes via an electrolyte. The electrolyte can be any of the following: liquid electrolyte (electrolyte), gel electrolyte, or solid electrolyte. The term "energy storage device" includes not only secondary batteries such as lithium-ion batteries and nickel-metal hydride batteries, but also capacitors that utilize chemical reactions, such as lithium-ion capacitors and pseudocapacitors.

[0028] like Figure 2 As shown, the energy storage device 100 includes a housing 10, an electrode body 20, a positive terminal 30, a negative terminal 40, a positive current collector 50, a negative current collector 60, and a separator 80. Here, the energy storage device 100 also includes a liquid electrolyte (electrolyte, not shown in the figure). Here, the energy storage device 100 is a non-aqueous electrolyte secondary battery. The energy storage device 100 is preferably a secondary battery such as a lithium-ion secondary battery.

[0029] The housing 10 is a frame that houses the electrode body 20. For example... Figure 1 As shown, the housing 10 here has a flat, bottomed cuboid shape (square). The material of the housing 10 can be the same as conventionally used materials and is not particularly limited. The housing 10 is preferably made of metal, and more preferably of, for example, aluminum, aluminum alloy, iron, or iron alloy. Figure 2 As shown, the housing 10 includes a housing body 12 and a sealing plate (cover) 14. The housing 10 (housing body 12 and sealing plate 14) has a size corresponding to the size of the electrode body 20 and the number (one or more) it can accommodate.

[0030] The main body 12 is a bottomed cylindrical shape having a bottom wall, side walls disposed on the outer periphery of the bottom wall, and an opening opposite the bottom wall. Here, the main body 12 is a bottomed, square container with an opening 12h on its upper surface. More specifically, as... Figure 1 As shown, the main body 12 of the housing is in the shape of a bottomed rectangular tube, that is, the main body 12 of the housing has: a generally rectangular bottom wall 12a (first wall), the bottom wall 12a having a long side and a short side; a pair of long side walls 12b (second wall and third wall), the pair of long side walls 12b extending from the long side of the bottom wall 12a and facing each other; a pair of short side walls 12c (fourth wall and fifth wall), the pair of short side walls 12c extending from the short side of the bottom wall 12a and facing each other; and an opening 12h (see reference). Figure 2 The opening 12h is opposite to the bottom wall 12a. The main body 12 of the shell is preferably in the shape of a bottomed square tube. Here, the opening 12h is generally rectangular. The bottom wall 12a forms the lower surface of the shell 10.

[0031] Furthermore, in this specification, the term "approximately rectangular" refers to shapes other than a perfect rectangle, such as those where the corners connecting the long and short sides of a rectangle are rounded, or shapes with cuts at the corners.

[0032] The area of ​​the long sidewall 12b is larger than the area of ​​the short sidewall 12c. In this embodiment, the long sidewall 12b and the short sidewall 12c are formed continuously from the outer periphery of the bottom wall 12a. In other words, the boundary between the bottom wall 12a and the long sidewall 12b is not a welded portion (not welded together), but a bent portion. Similarly, the boundary between the bottom wall 12a and the short sidewall 12c is not a welded portion (not welded together), but a bent portion. This type of housing body 12 can be formed, for example, by deep drawing a sheet of metal. The long sidewall 12b and the short sidewall 12c are examples of "sidewalls".

[0033] The sealing plate 14 is mounted to the housing body 12 to seal the opening 12h of the housing body 12. Typically, the sealing plate 14 is a plate-shaped component. The sealing plate 14 faces the bottom wall 12a of the housing body 12. Here, the sealing plate 14 is generally rectangular. The sealing plate 14 forms the upper surface of the housing 10. The housing 10 is integrated by joining the sealing plate 14 to the periphery of the opening 12h of the housing body 12 (e.g., by welding). Figure 2 As shown, a joint (e.g., a welded joint) 10w is formed at the fitting portion between the housing body 12 and the sealing plate 14. As a result, the housing 10 is airtightly sealed (sealed).

[0034] like Figure 2 As shown, an exhaust valve 17, outlet holes 18 and 19, and an electrolyte injection hole 15 are provided on the bottom wall 12a of the main body 12 (see also...). Figure 3 ) and protrusion 12p (see also) Figure 4 The exhaust valve 17 is a thin-walled portion configured to break when the pressure inside the housing 10 reaches a predetermined value, thereby venting gas from the housing 10 to the outside. Alternatively, the exhaust valve 17 may be provided on the sealing plate 14. Outlet holes 18 and 19 are formed at both ends of the long side Y direction of the bottom wall 12a. Outlet holes 18 and 19 penetrate the bottom wall 12a. A positive current collector 50 (specifically, shaft portion 52 described later) and a negative current collector 60 (specifically, shaft portion 62 described later) are respectively inserted into the outlet holes 18 and 19.

[0035] The electrolyte injection hole 15 is a through hole used to inject electrolyte into the interior of the housing 10 after the sealing plate 14 is assembled to the housing body 12. Figure 2 , Figure 3As shown, after electrolyte is injected, the electrolyte injection hole 15 is inserted into the sealing plug 16p, and sealed by engaging (e.g., welding) the sealing plug cap 16c with the periphery of the electrolyte injection hole 15. The sealing plug 16p is preferably made of resin. The sealing plug cap 16c is preferably made of metal, more preferably of aluminum or an aluminum alloy. The sealing plug 16p and the sealing plug cap 16c can be integral or separate. Alternatively, the electrolyte injection hole 15 can also be located on the sealing plate 14.

[0036] Here, the sealing plug 16p is longer than the electrolyte injection hole 15 located on the bottom wall 12a in the vertical Z direction, such as... Figure 3 As shown, it extends towards the inner surface of the bottom wall 12a. The portion of the sealing plug 16p extending towards the inner surface is received within the injection through hole 81 of the separator 80 (described later). The front end of the sealing plug 16p ( Figure 3 The upper end of the sealing plug 16p is disposed within the through hole 81 for electrolyte injection in the separator 80. The sealing plug cap 16c is disposed such that it covers the sealing plug 16p from the outer surface side of the bottom wall 12a. Here, the sealing plug cap 16c is disposed within the recess 15b provided in a manner that surrounds the electrolyte injection hole 15. As a result, interference between the joint between the bottom wall 12a and the sealing plug 16p and other components can be better suppressed, thus preventing damage or breakage at the joint.

[0037] like Figure 4 As shown, a protrusion 12p is provided on the inner surface of the bottom wall 12a. The protrusion 12p is a protrusion (convex portion) that projects inward from the inner surface side (electrode body 20 side) of the bottom wall 12a. The protrusion 12p is the portion inserted into the hole 87 of the spacer 80 in the insertion process (step 4) of the manufacturing method described later. From the viewpoint of improving the insertionability of the hole 87, the diameter of the protrusion 12p preferably gradually decreases towards the front end (as it moves away from the bottom wall 12a). That is, it is preferably tapered. The protrusion 12p can function as a positioning member for guiding the spacer 80 and the current collector (positive current collector 50 and / or negative current collector 60) to the desired position. From the viewpoint of improving positioning accuracy, such as Figure 1 As shown, the protrusions 12p are preferably multiple (two or more, for example, an even number). The multiple protrusions 12p are preferably located at a pair of diagonal corners of the bottom wall 12a.

[0038] The electrode body 20 is housed inside the housing 10. The number of electrode bodies 20 housed in one housing 10 is not particularly limited; it can be one or more (e.g., two or more, three or more). As described later, in this embodiment, multiple (specifically two) electrode bodies 20 are provided inside one housing 10 (see reference). Figure 6 ).

[0039] like Figure 2As shown, the electrode 20 is disposed inside the housing 10, covered by an electrode support 29 made of resin sheet. This prevents the electrode 20 from directly contacting the housing body 12. The material of the electrode support 29 can be the same as conventionally used materials and is not particularly limited. Examples of such materials include polyolefin resins such as polypropylene (PP) and polyethylene (PE), fluorinated resins such as perfluoroalkoxyalkanes and polytetrafluoroethylene (PTFE).

[0040] Figure 5 This is a schematic diagram showing the structure of the electrode body 20. Furthermore, Figure 5 In the attached figures, reference numeral LD ​​indicates the direction of the long side of the electrode body 20 manufactured in a strip shape. Reference numeral WD is a direction approximately orthogonal to the long side direction LD, indicating the winding axis of the electrode body 20.

[0041] like Figure 5 As shown, the electrode body 20 includes a positive electrode 22 and a negative electrode 24. In this embodiment, the electrode body 20 is a wound electrode body constructed by stacking strip-shaped positive electrodes 22 and strip-shaped negative electrodes 24 insulated from each other by two strip-shaped diaphragms 26 and winding them along the long side direction LD with a winding shaft WL as the center. However, the electrode body 20 may also be a stacked electrode body constructed by stacking multiple square (typically rectangular) positive electrodes and multiple square (typically rectangular) negative electrodes in an insulated state. Here, the electrode body 20 has a flat shape. Here, the electrode body 20 is housed inside the housing 10 with the winding shaft WL approximately aligned with the vertical direction Z. One of the positive electrode 22 and the negative electrode 24 is an example of a "first electrode," and the other is an example of a "second electrode."

[0042] like Figure 5 As shown, the positive electrode 22 comprises a strip-shaped positive current collector 22c and a positive active material layer 22a fixed on at least one surface (preferably both surfaces) of the positive current collector 22c. Here, the positive electrode 22 also comprises a positive protective layer 22p. However, the positive protective layer 22p is not essential and may be omitted in other embodiments. Existing known materials that can be used in common energy storage devices (e.g., lithium-ion secondary batteries) can be used without particular limitation for the components constituting the positive electrode 22. The positive current collector 22c is preferably made of a conductive metal such as aluminum, aluminum alloy, nickel, or stainless steel; specifically, the metal foil is aluminum foil. However, as also described in the later modified examples (1-1), the positive current collector 22c may also have an insulating core (e.g., a resin layer).

[0043] like Figure 5As shown, the positive electrode 22 has multiple positive electrode tabs 22t on one end edge of the winding axis WD. The multiple positive electrode tabs 22t are arranged at predetermined intervals (intermittently) along the long side direction LD. The number of positive electrode tabs 22t attached to one electrode body 20 can be several dozen or more, for example, 40 to 60. The multiple positive electrode tabs 22t are convex, facing outwards (…). Figure 5 (The left side) protrudes. Here, the multiple positive electrode tabs 22t are of the same shape, each being approximately rectangular. However, the size and shape of the multiple positive electrode tabs 22t may differ from each other. Here, the positive electrode tabs 22t and the positive electrode 22 are integrated. The positive electrode tab 22t is the region in the positive current collector 22c where the positive electrode active material layer 22a is not formed. At least a portion of the positive electrode tab 22t exposes the positive current collector 22c. However, as also described in the modified examples (1-2) described later, the positive electrode tab 22t may be a component different from the positive electrode 22.

[0044] Multiple positive electrode tabs 22t are stacked at one end of the winding axis WD of the electrode body 20, forming a positive electrode tab group 27 (see reference). Figure 2 ).like Figure 2 As shown, the front end of the positive electrode tab group 27 ( Figure 2 The lower end of the positive electrode 22 is connected (more specifically, joined) to the positive current collector 50. The positive electrode 22 is electrically connected to the positive terminal 30 via the positive electrode tab group 27 (a plurality of positive electrode tabs 22t) and the positive current collector 50. The positive electrode 22 is preferably electrically connected to the positive current collector 50 via the positive electrode tab group 27.

[0045] like Figure 5 As shown, the positive electrode active material layer 22a is arranged in a strip shape along the long side LD of the positive electrode current collector 22c. The positive electrode active material layer 22a contains a positive electrode active material (such as lithium transition metal composite oxides such as lithium nickel cobalt manganese composite oxides) capable of reversibly attracting or releasing charge carriers. The positive electrode active material layer 22a may also contain any components other than the positive electrode active material, such as conductive materials, binders, and various additives.

[0046] like Figure 5 As shown, the positive electrode protective layer 22p is formed into a strip along the long side direction LD of the positive electrode current collector 22c. The positive electrode protective layer 22p is disposed at the boundary between the positive electrode current collector 22c and the positive electrode active material layer 22a along the winding axis WD. The positive electrode protective layer 22p contains insulating inorganic fillers (such as ceramic particles like alumina). The positive electrode protective layer 22p may also contain any components other than inorganic fillers, such as adhesives, conductive materials, and various additives. By providing the positive electrode protective layer 22p, direct contact between the positive electrode 22 and the negative electrode active material layer 24a, preventing internal short circuits in the energy storage device 100 in the event of diaphragm 26 damage.

[0047] like Figure 5 As shown, the negative electrode 24 comprises a strip-shaped negative electrode current collector 24c and a negative electrode active material layer 24a fixed on at least one surface (preferably both surfaces) of the negative electrode current collector 24c. For the components constituting the negative electrode 24, existing known materials that can be used in common energy storage devices (e.g., lithium-ion secondary batteries) can be used without particular limitation. The negative electrode current collector 24c is preferably made of a conductive metal such as copper, copper alloy, nickel, or stainless steel; specifically, the metal foil is copper foil. However, as also described in the modified example (1-1) described later, the negative electrode current collector 24c may also have an insulating core (e.g., a resin layer).

[0048] like Figure 5 As shown, the negative electrode 24 has multiple negative electrode tabs 24t on one end edge of the winding axis WD. On the winding axis WD, the negative electrode tabs 24t are located on the same side as the positive electrode tabs 22t. Figure 5 The left end of the electrode. Multiple negative electrode tabs 24t are intermittently arranged at predetermined intervals along the long side LD. The number of negative electrode tabs 24t attached to one electrode body 20 is roughly the same as the number of positive electrode tabs 22t, and can be several dozen or more. The multiple negative electrode tabs 24t are convex and face outwards. Figure 5 (The left side) protrudes. Furthermore, the multiple negative electrode tabs 24t are of the same shape, each being approximately rectangular. However, the size and shape of the multiple negative electrode tabs 24t may differ from each other. Furthermore, the negative electrode tabs 24t are integrally formed with the negative electrode 24. The negative electrode tab 24t is the region in the negative electrode current collector 24c where the negative electrode active material layer 24a is not formed. At least a portion of the negative electrode tab 24t exposes the negative electrode current collector 24c. However, as described in the later modified examples (1-2), the negative electrode tab 24t may also be a component different from the negative electrode 24.

[0049] Multiple negative electrode tabs 24t are stacked at one end of the winding axis WD of the electrode body 20, forming a negative electrode tab group 28 (see reference). Figure 2 ).like Figure 2 As shown, the front end of the negative electrode tab group 28 ( Figure 2 The lower end of the electrode 24 is connected (more specifically, joined) to the negative current collector 60. The negative electrode 24 is electrically connected to the negative terminal 40 via the negative electrode tab group 28 (a plurality of negative electrode tabs 24t) and the negative current collector 60. The negative electrode 24 is preferably electrically connected to the negative current collector 60 via the negative electrode tab group 28. The electrode body 20 preferably has a positive electrode tab group 27 and a negative electrode tab group 28 at one end.

[0050] like Figure 5As shown, the negative electrode active material layer 24a is arranged in a strip shape along the long side LD of the negative electrode current collector 24c. The negative electrode active material layer 24a contains a negative electrode active material (such as carbon materials like graphite or silicon materials) capable of reversibly attracting or releasing charge carriers. The negative electrode active material layer 24a may also contain any components other than the negative electrode active material, such as binders, dispersants, and various additives.

[0051] like Figure 5 As shown, the separator 26 is a component that insulates the positive electrode active material layer 22a of the positive electrode 22 from the negative electrode active material layer 24a of the negative electrode 24. The separator 26 is preferably a porous sheet made of a resin such as polyethylene (PE) or polypropylene (PP). The separator 26 may also have a substrate portion made of a porous sheet of resin and a functional layer (e.g., a heat resistance layer (HRL) or an adhesive layer) formed on at least one surface of the substrate portion. Typically, the heat resistance layer is a layer containing inorganic fillers and an adhesive. Examples of inorganic fillers used include alumina, boehmite, aluminum hydroxide, and titanium dioxide. Here, the separator 26 constitutes the outer surface (outermost peripheral portion) of the electrode body 20.

[0052] As a liquid electrolyte, any electrolyte that can be used in common energy storage devices (such as lithium-ion secondary batteries) can be used without particular limitations. For example, a non-aqueous electrolyte in which a supporting salt is dissolved in a non-aqueous solvent can be used. Examples of non-aqueous solvents include carbonate solvents such as ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate. Examples of supporting salts include lithium salts such as LiPF6 and sodium salts such as NaPF6. The electrolyte may also contain additives as needed. However, in other embodiments, the electrolyte may be integrated with the electrode body 20 in a solid form (solid electrolyte).

[0053] like Figure 1 , Figure 2 As shown, the positive terminal 30 and the negative terminal 40 are respectively mounted on the bottom wall 12a of the bottom cylindrical housing body 12. The positive terminal 30 is mounted on the end of the bottom wall 12a along the long side in the Y direction. Figure 1 , Figure 2 The right end of the bottom wall 12a is specifically mounted on the periphery of the lead-out hole 18. The negative terminal 40 is mounted on the other end of the bottom wall 12a in the Y direction along its long side. Figure 1 , Figure 2The positive terminal 30 (at the left end), specifically, is mounted around the periphery of the lead-out hole 19. Preferably, both the positive terminal 30 and the negative terminal 40 are mounted on the bottom wall 12a. However, in other embodiments, the bottom wall 12a may also accommodate one of the terminals. In the case where the positive electrode 22 is the "first electrode," the positive terminal 30 is an example of the "first electrode terminal." In the case where the negative electrode 24 is the "first electrode," the negative terminal 40 is an example of the "first electrode terminal."

[0054] In the housing 10, terminals (positive terminal 30 and / or negative terminal 40) are provided on the side opposite to the joint 10w between the housing body 12 and the sealing plate 14. By providing terminals (preferably positive terminal 30 and negative terminal 40) on the bottom wall 12a away from the joint 10w, even if external force is applied to the terminals during the use of the energy storage device 100, large loads can be suppressed from being applied to the joint 10w. Therefore, the joint 10w is less likely to be damaged, and the sealing performance and reliability of the joint 10w can be improved.

[0055] like Figure 2 As shown, the terminals (positive terminal 30 and / or negative terminal 40) are insulated from the bottom wall 12a of the housing body 12 by insulating components (here, washers 90 and external insulating components 92). The terminals are fixed to the bottom wall 12a of the housing body 12 via washers 90 and external insulating components 92. Washers 90 and external insulating components 92 are preferably made of resin. The terminals can also be mounted to the bottom wall 12a together with washers 90 and external insulating components 92 by an insert molding (integral molding) method. The terminals can be fixed to the bottom wall 12a together with washers 90 and external insulating components 92 by riveting or other methods, or they can be fixed to the bottom wall 12a via an adhesive layer (adhesive, etc.). In addition, when the bottom wall 12a is used to mount one of the terminals, the terminal of one of the terminals can also be electrically connected to the bottom wall 12a directly or via other conductive components.

[0056] Furthermore, in the following explanation, the case where the positive electrode 22 is referred to as the "first electrode" is sometimes used as an example, but the negative electrode 24 side can also have the same structure. In this case, the following description of the "positive electrode" can be appropriately changed to "negative electrode".

[0057] like Figure 2 , Figure 3 As shown, the positive terminal 30 is electrically connected to the positive electrode 22 of the electrode body 20 via the positive current collector 50. Here, the positive terminal 30 is electrically connected to the positive electrode tab group 27 of the positive electrode 22. The positive terminal 30 is preferably made of metal, for example, more preferably aluminum or an aluminum alloy. In this embodiment, the positive terminal 30 has a through hole 30h. Here, the through hole 30h is formed in a cylindrical shape. The positive current collector 50 (more specifically, the shaft portion 52 described later) is inserted through the through hole 30h.

[0058] like Figure 2 As shown, the negative terminal 40 is electrically connected to the negative terminal 24 of the electrode body 20 via the negative current collector 60. Here, the negative terminal 40 is electrically connected to the negative electrode tab group 28 of the negative terminal 24. The negative terminal 40 is preferably made of metal, for example, more preferably copper or a copper alloy. Here, the negative terminal 40 has the same structure as the positive terminal 30. The negative terminal 40 has a through hole 40h. Here, the through hole 40h is formed in a cylindrical shape. The negative current collector 60 (more specifically, the shaft portion 62 described later) is inserted through the through hole 40h.

[0059] The positive current collector 50 is a conductive component that forms a conductive path between the positive electrode 22 (specifically, the positive electrode tab group 27) and the positive terminal 30. By sandwiching the positive current collector 50 between the positive electrode tab group 27 and the positive terminal 30, the electrical connection is made more stable and easier to maintain. The positive current collector 50 is preferably made of a metal with excellent conductivity, such as aluminum or an aluminum alloy. The positive current collector 50 may also be made of the same type of metal as the positive electrode tab 22 and / or the positive terminal 30. In the case where the positive electrode 22 is the "first electrode", the positive current collector 50 is an example of the "first current collector".

[0060] like Figure 3 As shown, the positive current collector 50 is sequentially inserted from the inside of the housing 10 into the through hole 85h (described later) of the separator 80, the lead-out hole 18 of the bottom wall 12a, and the through hole 30h of the positive terminal 30. The positive current collector 50 is inserted from the inside of the housing body 12 (… Figure 3 The upper side extends to the outside ( Figure 3 (Lower side). A portion of the positive current collector 50 is exposed outside the housing 10. The positive current collector 50 is mounted on the electrode body 20. The positive current collector 50 is integrated with the separator 80. Figure 6 It is a schematic exploded perspective view of the composite material including electrode body 20, positive electrode current collector 50, negative electrode current collector 60 and separator 80.

[0061] like Figure 3 , Figure 6 As shown, the positive electrode current collector 50 has a flange portion 51 and a shaft portion 52. The flange portion 51 is provided at the upper end of the positive electrode current collector 50 (the end on the electrode body 20 side). The flange portion 51 is disposed inside the housing 10 (more specifically, the housing body 12). The outer diameter of the flange portion 51 is larger than the outer diameter of the shaft portion 52. The flange portion 51 is mounted on the positive electrode tab group 27 (multiple positive electrode tabs 22t) and is electrically connected to the positive electrode 22. The flange portion 51 is joined to the positive electrode tab group 27 (multiple positive electrode tabs 22t) (e.g., by ultrasonic welding or other welding joint).

[0062] like Figure 3As shown, the flange 51 extends along the inner surface of the bottom wall 12a. In the long side direction Y, the width of the flange 51 is approximately the same as, but preferably wider than, the width of the positive electrode tab group 27. The flange 51 is larger in shape than the lead-out hole 18 in the bottom wall 12a. The flange 51 is larger in shape than the through hole 30h of the positive terminal 30. The flange 51 is insulated from the bottom wall 12a of the housing body 12 by an insulating member (here, the spacer 80). The flange 51 engages with the stepped portion 85s of the spacer 80 (described later).

[0063] like Figure 6 As shown, the flange 51 is hexagonal in the top view of the XY plane. The short side of the flange 51 is on one side in the X direction (…). Figure 6 The corner of the rear side of the flange 51 is formed into an arc shape (the shape after the corner is rounded). The other side of the flange 51 in the short side direction X ( Figure 6 The corner of the flange 51 (front side) is cut out. Therefore, the flange 51 has a shape that is asymmetrical front-to-back in the short-side direction X and symmetrical left-to-right in the long-side direction Y. A fitting recess 51r (groove, neck) is provided on the outer peripheral sidewall of the flange 51. Here, the fitting recess 51r is provided throughout the entire circumference of the flange 51. The fitting recess 51r is annular (e.g., circular). Figure 3 As shown, the fitting protrusion 85c, described later, is fitted with the spacer 80 in the fitting recess 51r.

[0064] A shaft portion 52 is provided at the lower end of the positive current collector 50 (the end on the bottom wall 12a side). The shaft portion 52 is the portion protruding from the flange portion 51. The external shape of the shaft portion 52 is smaller than that of the flange portion 51. Here, the shaft portion 52 is smaller than the through hole 85h of the separator 80 and is inserted into the through hole 85h. Here, the shaft portion 52 is smaller than the lead-out hole 18 of the bottom wall 12a and is inserted into the lead-out hole 18. The shaft portion 52 is insulated from the bottom wall 12a of the housing body 12 by an insulating member (here, a washer 90). The shaft portion 52 is smaller than the through hole 30h of the positive terminal 30 and is inserted into the through hole 30h. As a result, the electrical connection between the positive terminal 30 and the positive current collector 50 is more stable and easier to maintain, thereby improving the reliability of conduction.

[0065] like Figure 6As shown, the shaft portion 52 is cylindrical, specifically cylindrical. The vertical length Z of the shaft portion 52 is preferably shorter than the vertical length Z of the protrusion 12p provided on the bottom wall 12a. Therefore, the protrusion 12p can function appropriately as a positioning member for the separator 80 and the current collector components (positive current collector 50 and / or negative current collector 60). As also described in the modified example (3) described later, the shaft portion 52 may also be a protrusion or the like. The shaft portion 52 is preferably circular in a top view of the XY plane. If both the shaft portion 52 and the through hole 30h of the positive terminal 30 are circular in a top view of the XY plane, the insertability of the shaft portion 52 and the airtightness of the through hole 30h after insertion into the shaft portion 52 can be improved. Furthermore, the reliability of the energy storage device 100 can be improved.

[0066] like Figure 3 As shown, the shaft portion 52 extends outward from the interior of the housing 10. The lower end of the shaft portion 52 protrudes from the exterior of the housing body 12 (on the outer surface of the bottom wall 12a). The lower end of the shaft portion 52 is housed within the through hole 30h. The lower end face of the shaft portion 52 is approximately coplanar with the lower end face (the outer side face) of the positive terminal 30 (allowing for manufacturing tolerances, etc.). The shaft portion 52 does not protrude from the through hole 30h. However, in other embodiments, the shaft portion 52 may protrude from the through hole 30h.

[0067] The positive current collector 50 is coupled to the positive terminal 30. In this embodiment, as... Figure 3 As shown, the periphery of the through hole 30h of the positive terminal 30 engages with the shaft portion 52 (particularly the front end of the outer side of the housing body 12) of the positive current collector 50 inserted into the through hole 30h. The positive terminal 30 and the positive current collector 50 are engaged on the outside of the housing body 12 (on the outer surface of the bottom wall 12a). By engaging the positive terminal 30 and the positive current collector 50 on the outside of the housing body 12, the positive terminal 30 and the positive current collector 50 can be engaged more stably.

[0068] A joint J is formed on the outer side of the housing body 12. The joint J is preferably a welded joint formed, for example, by irradiation with energy rays such as laser welding. Here, the joint J extends outward from the through hole 30h. Figure 1 As shown, the joint J is annular (e.g., circular). The joint J is continuously disposed around the periphery of the through hole 30h of the positive terminal 30 and the boundary portion of the shaft 52 of the positive current collector 50. This makes the electrical connection between the positive terminal 30 and the positive current collector 50 more stable and easier to maintain, and improves the conductivity reliability of the joint J.

[0069] The negative current collector 60 is a conductive component, forming a conductive path between the negative electrode 24 (specifically, the negative electrode tab group 28) and the negative terminal 40. The negative current collector 60 is preferably made of a metal with excellent conductivity, such as copper or a copper alloy. The negative current collector 60 may also be made of the same type of metal as the negative electrode tab 24t and / or the negative terminal 40. Here, the negative current collector 60 has the same structure as the positive current collector 50. Figure 2 As shown, the negative electrode current collector 60 has a flange portion 61 and a shaft portion 62. When the negative electrode 24 is the "first electrode", the negative electrode current collector 60 is an example of the "first current collector".

[0070] like Figure 2 As shown, the spacer 80 is disposed inside the housing 10 on the bottom wall 12a (more specifically, the inner side). Figure 2 The upper surface) and the electrode body 20 (more specifically, the upper surface) and the electrode body 20 Figure 2 Between the lower sides. Furthermore, in Figure 2 In the above examples, the spacer 80, which is a major component, is depicted as larger than it actually is. Typically, the spacer 80 is insulating and preferably made of resin. The material of the spacer 80 can also be the same as that shown in the example of the material used for the electrode support 29. Here, the spacer 80 is a single component. However, as also described in the modified examples (2-2) described later, the spacer 80 can also be composed of multiple components. The multiple components can be assembled into one unit or disposed in separate positions. For example, a first spacer and a second spacer can be disposed on the positive terminal 30 side and the negative terminal 40 side, respectively.

[0071] Figure 7A This is a schematic top view representing the isolation element 80. Figure 7B It is a schematic three-dimensional representation of the isolated object. Furthermore, in Figure 7A In the image, the side walls (a pair of long side walls 12b and a pair of short side walls 12c) of the housing body 12 are shown together with virtual lines. Figure 7B This indicates the surface on the side of electrode body 20. For example... Figure 6 , Figure 7A , Figure 7B As shown, the separator 80 has a base 89, a through hole 81 for liquid injection, a through hole 82 for venting, a positive electrode side support 85, and a negative electrode side support 86.

[0072] like Figure 2 As shown, the base 89 extends along the bottom wall 12a of the main body 12 of the housing. Figure 7AAs shown, in a top view in the XY plane, the outer periphery of the spacer 80 (specifically, the base 89) preferably abuts against or approaches the inner surface of the sidewall of the housing body 12. The gap between the spacer 80 and the sidewall of the housing body 12 (the difference between the internal dimension of the housing body 12 and the external dimension of the spacer 80) is preferably 1 mm or less, more preferably 0.8 mm or less, and even more preferably 0.5 mm or less. Therefore, the spacer 80 can easily function effectively as a positioning component, as described later.

[0073] according to Figure 7B It is understood that the base 89 has a relatively thin-walled region A1 and a relatively thick-walled region A2. Here, the thin-walled region A1 is respectively provided at the periphery of the injection through-hole 81 and the venting through-hole 82, at the periphery of the positive electrode side support 85, and at the periphery of the negative electrode side support 86. Here, the thick-walled region A2 is provided at the outer edge of the base 89, near a pair of short sidewalls 12c, between the injection through-hole 81 and the positive electrode side support 85, and between the venting through-hole 82 and the negative electrode side support 86. The thickness of the thick-walled region A2 is preferably at least twice the thickness of the thin-walled region A1, and more preferably at least three times.

[0074] like Figure 3 As shown by the dashed line, the thick-walled region A2 preferably abuts against or approaches one end of the electrode body 20 (or electrode body support 29). This allows for load distribution during the insertion process (step 4) or the joining process (step 5) of the manufacturing method described later. Furthermore, it makes it difficult for the electrode body 20 to move within the housing 10. On the other hand, it is preferable to ensure a gap S between the thin-walled region A1 and the electrode body 20 (or electrode body support 29) at the periphery of the positive electrode side support 85 and the negative electrode side support 86.

[0075] By having a thick-walled region A2 in the base 89, gaps S are ensured at the periphery of the positive electrode-side support 85 and the negative electrode-side support 86. Even when the energy storage device 100 is manufactured and used with the bottom wall 12a of the housing body 12 positioned vertically downwards, the electrode body 20 can still be supported by the bottom wall 12a via the thick-walled region A2. Therefore, damage to the conduction path, such as the positive electrode tab group 27 and / or the negative electrode tab group 28, or the junction of the positive electrode tab group 27 and the positive electrode current collector 50 and / or the junction of the negative electrode tab group 28 and the negative electrode current collector 60, due to the weight of the electrode body 20 can be appropriately suppressed. However, the thick-walled region A2 is not necessary, and the base 89 can also be a flat plate with a substantially uniform thickness.

[0076] The through hole 81 for liquid injection is a through hole that penetrates the thin-walled region A1 of the base 89 in the vertical Z direction. For example... Figure 2As shown, the through hole 81 for electrolyte injection is located in the portion opposite to the electrolyte injection hole 15 (the overlapping portion in the top view of the XY plane). Therefore, in the vertical Z direction, the electrolyte injection hole 15 is directly opposite the electrode body 20 (or electrode body support 29). Figure 7B As shown, reinforcing ribs 81r are provided around the through hole 81 for electrolyte injection. Therefore, even when a load is applied to the periphery of the electrolyte injection hole 15, for example, during electrolyte injection, deformation of the bottom wall 12a can be suppressed. Here, the reinforcing ribs 81r are provided around the periphery of the through hole 81 for electrolyte injection and are arranged radially around the through hole 81 for electrolyte injection. The reinforcing ribs 81r are connected to the thick-walled region A2. However, the through hole 81 for electrolyte injection is not necessary; for example, it can be omitted if the housing body 12 does not have the electrolyte injection hole 15 or if the electrolyte injection hole 15 is located on the sealing plate 14 side.

[0077] The exhaust through-hole 82 is a through-hole that penetrates the thin-walled region A1 of the base 89 in the vertical Z direction. For example... Figure 2 As shown, the exhaust through-hole 82 is provided in the portion opposite to the exhaust valve 17 (the overlapping portion in the top view of the XY plane). Thus, in the vertical direction Z, the exhaust valve 17 is directly opposite the electrode body 20 (or electrode body support 29). With this structure, the exhaust valve 17 can be easily and stably opened when the pressure inside the housing 10 reaches a predetermined value or higher. Here, the exhaust through-hole 82 is a hole formed by punching. However, the exhaust through-hole 82 is not necessary; for example, it can be omitted when the exhaust valve 17 is located on the sealing plate 14 side.

[0078] A positive electrode-side support portion 85 is provided on the surface of the base 89 on the electrode body 20 side. The positive electrode-side support portion 85 is provided in the thin-walled region A1. The positive electrode-side support portion 85 supports the conductive path on the positive electrode 22 side. Figure 7A , Figure 7B As shown, a stepped portion 85s (recess) and a through hole 85h are provided on the positive electrode side support portion 85.

[0079] The stepped portion 85s is located on the outer periphery of the through hole 85h. According to... Figure 3 As can be seen, a positive current collector 50 is disposed in the stepped portion 85s. Here, the stepped portion 85s has the same shape as the flange portion 51 in the top view of the XY plane. The flange portion 51 of the positive current collector 50 is fitted into the stepped portion 85s. Therefore, in the insertion process (step 4) of the manufacturing method described later, it is possible to prevent the positive current collector 50 from deviating from the desired position. In addition, since the positive current collector 50 can be maintained in the desired posture, the positive current collector 50 can be stably inserted into the through hole 30h.

[0080] A through hole 85h is provided within the stepped portion 85s. A positive current collector 50 (specifically, a cylindrical shaft portion 52) is inserted through the through hole 85h. Here, the outer periphery of the through hole 85h is closed. However, the through hole 85h does not necessarily need to be closed on the outer periphery; for example, it may have an opening, as described in the modified example (2-1) below. Figure 3 As shown, a fitting protrusion 85c is provided on the inner wall surface of the through hole 85h. The fitting protrusion 85c of the through hole 85h fits into the fitting recess 51r of the positive current collector 50. Furthermore, in this embodiment, the fitting protrusion 85c is provided on the separator 80 and the fitting recess 51r is provided on the positive current collector 50. However, in other embodiments, the opposite can be true, with the fitting recess provided on the separator 80 side and the fitting protrusion provided on the positive current collector 50 side.

[0081] A negative electrode-side support portion 86 is provided on the surface of the base 89 on the electrode body 20 side. The negative electrode-side support portion 86 is provided in the thin-walled region A1. The negative electrode-side support portion 86 supports the conductive path on the negative electrode 24 side. The negative electrode-side support portion 86 has the same structure as the positive electrode-side support portion 85. The negative electrode-side support portion 86 and the positive electrode-side support portion 85 are arranged symmetrically on both sides. Figure 7A , Figure 7B As shown, a stepped portion 86s (recess) and a through hole 86h are provided on the negative electrode side support portion 86.

[0082] The stepped portion 86s is located on the outer periphery of the through hole 86h. According to... Figure 2 As can be seen, a negative current collector 60 is disposed in the stepped portion 86s. Here, the flange portion 61 of the negative current collector 60 is fitted into the stepped portion 86s. A through hole 86h is provided in the stepped portion 86s. The negative current collector 60 (more specifically, a columnar shaft portion 62) is inserted through the through hole 86h. Although not shown in the figure, similar to the through hole 85h on the positive side, a fitting protrusion is also provided on the inner wall surface of the through hole 86h. The fitting protrusion of the through hole 86h fits into the fitting recess of the negative current collector 60.

[0083] In this embodiment, the separator 80 and the current collector (positive current collector 50 and / or negative current collector 60) are integrated (more specifically, mechanically connected) through the following structures (a) to (c). That is:

[0084] (a) The separator 80 has through holes 85h and 86h, the columnar shaft portion 52 (part of the first collector) of the positive collector 50 is inserted into the through hole 85h, and the columnar shaft portion 62 (part of the first collector) of the negative collector 60 is inserted into the through hole 86h.

[0085] (b) The separator 80 has stepped portions 85s and 86s (recesses), the flange portion 51 of the positive current collector 50 (part of the first current collector) engages with the stepped portion 85s, and the flange portion 61 of the negative current collector 60 (part of the first current collector) engages with the stepped portion 86s; and

[0086] (c) The separator 80 has through holes 85h and 86h, and a fitting protrusion 85c is provided on the inner sidewall of the through holes 85h and 86h. A fitting recess 51r is provided on the positive electrode current collector 50 and a fitting recess is provided on the negative electrode current collector 60. The fitting recess 51r fits into the fitting protrusion 85c.

[0087] In other words, the isolator 80 is assembled with the current collector. The isolator 80 is also integrated (connected) with the electrode body 20 via the current collector.

[0088] By integrating the separator 80 and the current collector (positive current collector 50 and / or negative current collector 60), the current collector and the electrode body 20 can be guided to the desired position in the insertion process (step 4) of the manufacturing method described later. That is, the separator 80 can function as a positioning component for the current collector and the electrode body 20. Furthermore, in the joining process (step 5) of the manufacturing method described later, the current collector and the terminals (positive terminal 30 and / or negative terminal 40) can be stably contacted, making joining easy.

[0089] Furthermore, in this embodiment, the isolator 80 and the current collector are integrated using the structures described in (a) to (c) above, but the method of integrating the isolator 80 and the current collector is not limited to the above cases. For example, the current collector can be fixed by providing a fixing claw on the upper or lower surface of the isolator 80 and using the claw to hold a part of the current collector (e.g., flange 51, 61). Alternatively, the isolator 80 and the electrode body 20 (or electrode body support 29) can be fixed using tape or the like, without integrating them via the current collector. In addition, it is not necessary to have all of the structures described in (a) to (c) above; having at least one (preferably multiple, more preferably all) structure is sufficient. In some embodiments, when the isolator 80 is pressed towards the bottom wall 12a via the electrode body 20, it is preferable to connect the isolator 80 and the current collector to facilitate pressing the current collector against the terminal. For example, it is preferable to... Figure 3 The disclosed method, the method of fixing by using the claw, or the method of the first variation described later.

[0090] In addition, such as Figure 6 , Figure 7A , Figure 7B As shown, the spacer 80 in this embodiment also has a hole 87. (As indicated...) Figure 4As shown, a hole 87 is provided on the surface of the base 89 on the side of the bottom wall 12a. The hole 87 is provided at a position corresponding to the protrusion 12p provided on the inner surface of the bottom wall 12a. Here, the hole 87 is a through hole that penetrates the thick-walled region A2 of the base 89 in the vertical direction Z. The protrusion 12p is inserted into the hole 87. Thus, the spacer 80 is positioned relative to the bottom wall 12a of the housing body 12. Furthermore, the current collectors (positive current collector 50 and / or negative current collector 60) integrated with the spacer 80 are positioned. From the viewpoint of improving the insertionability of the protrusion 12p, the diameter of the hole 87 preferably gradually increases towards the bottom wall 12a.

[0091] Furthermore, in this specification, the term "hole" refers not only to a through hole (a portion extending to the other side) as in this embodiment, but also to a recess (recess) provided on the inner surface of the bottom wall 12a side of the base 89 in the sense that it can accommodate at least a portion of the protrusion 12p. In this embodiment, the protrusion 12p is provided on the bottom wall 12a, and the hole 87 is provided on the spacer 80. However, in other embodiments, the opposite may be true: the protrusion is provided on the spacer 80 side, and the hole is provided on the bottom wall 12a side.

[0092] [Manufacturing method of energy storage device]

[0093] The energy storage device 100 of this embodiment can be manufactured, for example, by a method comprising the following steps: (step 1A) a housing preparation step, (step 1B) an electrode preparation step, (step 2) a connection step, (step 3) an assembly step, (step 4) an insertion step, (step 5) a joining step, and (step 6) a sealing step. However, the order of the housing preparation step (step 1A) and the electrode preparation step (step 1B) is not particularly limited; they can be reversed or performed approximately simultaneously. Similarly, the order of the housing preparation step (step 1A) and the connection step (step 2) is not particularly limited; they can be reversed or performed approximately simultaneously. Furthermore, the order of the connection step (step 2) and the assembly step (step 3) is not particularly limited; they can be reversed or performed approximately simultaneously. Additionally, the manufacturing method disclosed herein may also include other steps at any stage. For example, it may include a step of injecting electrolyte into the housing 10 after the (step 6) sealing step.

[0094] In the housing preparation process (step 1A), the housing body 12 and the sealing plate 14 are prepared before the insertion process. Specifically, a bottomed cylindrical housing body 12 having a bottom wall 12a, side walls 12b, 12c, and an opening 12h, and a sealing plate 14 for sealing the opening 12h are prepared. The housing body 12 and the sealing plate 14 can be purchased from suppliers or manufactured in-house. In some embodiments, terminals (positive terminal 30 and / or negative terminal 40) may be pre-installed on the bottom wall 12a of the housing body 12. The terminals are preferably installed on the bottom wall 12a in a state of insulation from the bottom wall 12a via insulating components (e.g., washers 90 and external insulating components 92).

[0095] The method of installing the terminals is not particularly limited. For example, the terminals may be pre-installed on the bottom wall 12a together with the gasket 90 and the external insulating component 92 by an insert molding (integral molding) method. That is, the housing body 12 may be prepared as an integrally molded product integrated with the gasket 90, the external insulating component 92, and the terminals (positive terminal 30 and / or negative terminal 40). Alternatively, the terminals may be installed on the bottom wall 12a together with the gasket 90 and the external insulating component 92 by riveting or other methods, or they may be installed on the bottom wall 12a via an adhesive layer (adhesive, etc.). In addition, the terminals do not necessarily need to be pre-installed on the bottom wall 12a; for example, they may be installed on the bottom wall 12a during the insertion process, joining process, etc., described later.

[0096] In the electrode preparation process (step 1B), electrode body 20 is prepared. Electrode body 20 can be a purchased item supplied by a supplier or the like, or it can be manufactured in-house. In one example, firstly, a strip-shaped positive electrode 22 and a strip-shaped negative electrode 24 are stacked via a strip-shaped diaphragm 26 and wound around a winding shaft WL in the long side direction LD to form a cylindrical shape. At this time, multiple positive electrode tabs 22t and multiple negative electrode tabs 24t are adjusted to protrude from the same end edge and are stacked in their respective positions. Next, a flat-shaped electrode body 20 is formed by, for example, flattening the wound cylindrical electrode body (cylindrical body). Then, multiple positive electrode tabs 22t are bundled to form an integrated positive electrode tab group 27. Similarly, multiple negative electrode tabs 24t are bundled to form an integrated negative electrode tab group 28.

[0097] In step 2, the first current collector (positive current collector 50 or negative current collector 60) is electrically connected to the first electrode (positive electrode 22 or negative electrode 24) of the electrode body 20. That is, a conductive path is formed from the first electrode to the first current collector. In this embodiment, the positive current collector 50 is electrically connected to the positive electrode 22 by joining the flange 51 of the positive current collector 50 to the positive electrode tab group 27 of the positive electrode 22. Similarly, the negative current collector 60 is electrically connected to the negative electrode 24 by joining the flange 61 of the negative current collector 60 to the negative electrode tab group 28 of the electrode body 20. The joining method can be the same as conventional and is not particularly limited. In some embodiments, for example, welding is preferably performed by irradiation with energy rays such as ultrasonic welding, resistance welding, or laser welding. As a result, the electrode body 20 and the current collector are integrated (mechanical connection). Then, the electrode body 20 is covered by the electrode body support 29 (resin sheet, etc.).

[0098] Furthermore, in the case where two electrode bodies 20 are housed inside a single housing 10 as in this embodiment, the positive electrode tabs 27 of the first electrode body 20 and the positive electrode tabs 27 of the second electrode body 20 can be coupled to a positive current collector 50, and the negative electrode tabs 28 of the first electrode body 20 and the negative electrode tabs 28 of the second electrode body 20 can be coupled to a negative current collector 60. Thus, the two electrode bodies 20 can be assembled into a single composite.

[0099] In the assembly process (step 3), before the insertion process (before inserting the electrode body 20 into the housing body 12), the spacer 80 is positioned at one end of the electrode body 20 on which the first current collector (positive current collector 50 or negative current collector 60) is mounted. Then, the first current collector is assembled on the spacer 80, resulting in an integrated state between the first current collector and the spacer 80. This allows the first current collector and the electrode body 20 to be easily guided to the desired position during the subsequent insertion process. In other words, the spacer 80 can function as a positioning component for the first current collector and the electrode body 20. Furthermore, during the subsequent joining process, the first current collector can be stably contacted with the first electrode terminal (positive terminal 30 or negative terminal 40) for stable joining.

[0100] As described above, the separator 80 of this embodiment has through holes 85h and 86h (see reference). Figure 7ATherefore, for example, if the separator 80 is placed over the first current collector, a portion of the first current collector (positive current collector 50 or negative current collector 60) (e.g., columnar shaft portions 52, 62) is inserted into the through holes 85h, 86h. This integrates the first current collector and the separator 80. The columnar shaft portions 52, 62 of the first current collector protrude from the through holes 85h, 86h of the separator 80. With this structure, the positioning of the first current collector can be performed more effectively in the insertion process described later. Furthermore, in the joining process, the first current collector and the first electrode terminal are more stably contacted, facilitating joining.

[0101] Furthermore, the spacer 80 in this embodiment has stepped portions 85s and 86s (recesses, see reference). Figure 7A Therefore, if an isolator 80 is disposed at one end of the electrode body 20, a portion (e.g., flange 51, 61) of the first current collector (positive current collector 50 or negative current collector 60) is fitted with the stepped portions 85s, 86s. The electrode body 20 side surface of the first current collector is supported by the stepped portions 85s, 86s (support portions) of the isolator 80, where the first electrode tab group (positive electrode tab group 27 or negative electrode tab group 28) is further inserted through the through holes 85h, 86h of the isolator 80. In addition, the thick-walled region A2 of the isolator 80 is supported by one end of the electrode body 20. Thus, the first current collector and the isolator 80 are integrated. According to this structure, the positioning of the first current collector can be performed more effectively in the insertion process described later. In addition, in the joining process, the first current collector and the first electrode terminal are more stably abutted, making joining easier.

[0102] Furthermore, the separator 80 in this embodiment has through holes 85h and 86h (see reference). Figure 7A A fitting protrusion 85c is provided on the inner wall surface of the through holes 85h and 86h (refer to...). Figure 3 Furthermore, a fitting recess 51r is provided in the first current collector (positive current collector 50 or negative current collector 60) at a position opposite to the fitting protrusion 85c. Therefore, if the separator 80 is provided at one end of the electrode body 20, the fitting protrusion 85c fits into the fitting recess 51r of the first current collector. As a result, the current collector is securely fixed to the separator 80, and the integration of the separator 80 and the current collector is improved.

[0103] As described above, in this process, the first current collector and the separator 80 are integrated, forming a composite object including the electrode body 20, the first current collector, and the separator 80 as shown in FIG. 7. Furthermore, in this embodiment, in the (step 2) connection process, the first current collector is first electrically connected to the first electrode of the electrode body 20, and in the (step 3) assembly process, the separator 80 is integrated with the first current collector. However, as mentioned above, the order of these processes is not particularly limited. For example, contrary to this embodiment, the separator 80 may be installed on the first current collector first, and then the first current collector is electrically connected to the first electrode of the electrode body 20.

[0104] In the insertion process (step 4), after the housing preparation and assembly processes, the electrode body 20, which is integrated with the separator 80, is inserted into the interior of the housing body 12 from one end (the separator 80 side) of the electrode body 20. Specifically, the electrode body 20 is inserted into the opening 12h of the housing body 12 with the side of the electrode body 20 on which the current collector (positive current collector 50 and / or negative current collector 60) is mounted facing the bottom wall 12a. Figure 8A This is an explanatory diagram of the insertion process. Figure 8B This is a magnified view of the area near the positive terminal 30, which is the main part. Furthermore, in Figure 8A , Figure 8B In this process, considering the workability in the subsequent joining process, the bottom wall 12a of the main body 12 is reversed so that it faces upward in the vertical direction. Furthermore, in Figure 8B The image shows a cross-section through which the outlet hole 18 and the protrusion 12p pass in the bottom wall 12a.

[0105] As described above, in this embodiment, the spacer 80 is configured such that its outer periphery abuts against or approaches the inner surface of the sidewalls (a pair of long sidewalls 12b and a pair of short sidewalls 12c) of the housing body 12. Therefore, as Figure 8A As shown, the spacer 80 inserted into the interior of the housing body 12 moves along the side walls 12b and 12c of the housing body 12 toward the bottom wall 12a. Therefore, it is easy to maintain the electrode body 20 in a horizontal state, and it is possible to prevent, for example, the electrode body 20 from being housed in the housing body 12 in an inclined state, or from getting stuck on the side wall during movement. That is, according to the spacer 80 of this embodiment, the electrode body 20 can be easily guided to the desired configuration position.

[0106] Furthermore, in this embodiment, since the current collector (positive current collector 50 and / or negative current collector 60) is integrated with the separator 80, the current collector also moves towards the bottom wall 12a as the separator 80 moves along the side walls 12b and 12c of the housing body 12. Moreover, according to... Figure 8A , Figure 8BIt is understood that at least a portion of the current collector is inserted into the through holes 30h and 40h of the terminals (positive terminal 30 and / or negative terminal 40). Specifically, the columnar shaft 52 of the positive current collector 50 is inserted into the through hole 30h of the positive terminal 30, and the columnar shaft 62 of the negative current collector 60 is inserted into the through hole 40h of the negative terminal 40. Thus, the current collector is stably inserted into the through hole of the terminal provided on the bottom wall 12a. That is, the separator 80 of this embodiment can function as a positioning member that guides the current collector to the desired engagement position.

[0107] In addition, such as Figure 8B As shown, in this embodiment, a protrusion 12p (convex portion) is provided on the inner surface side of the bottom wall 12a, and a hole 87 is provided in the separator 80. Therefore, as Figure 8B As indicated by the middle arrow, when the isolator 80 approaches the bottom wall 12a, the protrusion 12p of the bottom wall 12a is inserted into the hole 87 of the isolator 80. This allows the isolator 80 to be positioned relative to the housing body 12 (specifically, the bottom wall 12a). In particular, in this embodiment, since the vertical Z-length of the protrusion 12p is longer than the vertical Z-length of the shaft 52, the protrusion 12p of the bottom wall 12a is inserted into the hole 87 of the isolator 80 before at least a portion of the current collector is inserted into the through holes 30h and 40h of the terminals. This allows positional tolerances to be absorbed, and the isolator 80 to be positioned relative to the housing body 12 more effectively. That is, the current collector integrated with the isolator 80 can be easily positioned with high precision relative to the through holes 30h and 40h provided in the bottom wall 12a.

[0108] In this embodiment, such as Figure 8A As shown, this process is performed with the bottom wall 12a of the housing body 12 facing upward in the vertical direction in a reversed position. Alternatively, for example, if the electrode body 20 is heavy, this process can also be performed with the side walls (a pair of long side walls 12b or a pair of short side walls 12c) located vertically and the short or long side of the bottom wall 12a extending in the vertical direction.

[0109] In the (step 5) joining process, after the insertion process, the first current collector (positive current collector 50 or negative current collector 60) and the first electrode terminal (positive terminal 30 or negative terminal 40) are joined. Figure 9 This is an explanatory diagram of the joining process. Furthermore, in Figure 9 In, with Figure 8A Similarly, adopt the reverse posture with the bottom wall 12a facing upward in the vertical direction.

[0110] In this embodiment, before the joining process, such as Figure 3As shown, the engaging recess 51r of the positive current collector 50 and the engaging protrusion 85c of the separator 80 are engaged. Therefore, if the bottom wall 12a is maintained in its reversed position facing upward in the vertical direction, as shown... Figure 9 As shown by the middle arrow, when the electrode body 20 is pressed from the opening 12h side towards the bottom wall 12a side to apply a load P, then through the portion in contact with the electrode body 20 (thick-walled region A2), Figure 9 A load P1 is applied to the isolator 80 at the location indicated by the dotted line. This causes the first current collector to be pressed against the first electrode terminal via the isolator 80. Therefore, the first current collector can be suitably pressed against the first electrode terminal. Specifically, the shaft portions 52 and 62 of the first current collector can be suitably maintained in the state where the through holes 30h and 40h of the first electrode terminal are inserted. Preferably, the periphery of the through holes 30h and 40h of the first electrode terminal and the end faces of the shaft portions 52 and 62 of the first current collector can be kept substantially coplanar.

[0111] Furthermore, the electrode body 20 can be pressed by directly applying a load to its lower vertical end face (the end face opposite to the side where the first current collector is located), or it can be pressed via other components (such as the electrode body support 29, other spacers, clamps, sealing plate 14, etc.). In this embodiment, the electrode body 20 is pressed via the sealing plate 14. This makes it easy to press the electrode body 20 evenly.

[0112] Furthermore, with the first current collector (positive current collector 50 or negative current collector 60) pressed against the first electrode terminal (positive terminal 30 or negative terminal 40), the portion where the first current collector and the first electrode terminal abut is engaged. At this time, as... Figure 9 As indicated by the middle arrow, it is more preferable to press the first electrode terminal against the bottom wall 12a side of the housing body 12 using a clamp or the like. In this embodiment, the portion of the first current collector that is inserted into the through holes 30h and 40h (the front ends of the shaft portions 52 and 62) is joined to the first electrode terminal. This allows the first current collector and the first electrode terminal to reliably abut against each other, resulting in a more stable connection between the first current collector and the first electrode terminal.

[0113] The joining method is not particularly limited. In some embodiments, such as Figure 9 As shown, welding is preferably performed by irradiating an energy beam such as a laser LB from the outer side of the housing body 12 (the outer surface side of the bottom wall 12a). Since the joint can be visually observed from the outer side of the housing body 12, it is easier to connect the current collector and the terminal more stably. In this embodiment, an annular (e.g., circular) joint J is formed along the through holes 30h and 40h.

[0114] In the sealing process (step 6), the sealing plate 14 is fitted into the opening 12h of the housing body 12, and the periphery of the opening 12h of the housing body 12 and the sealing plate 14 are joined. This forms a joint 10w, sealing the housing 10. The joining method can be the same as conventional methods and is not particularly limited. In some embodiments, it is preferable to perform welding by irradiating the fitting portion of the housing body 12 and the sealing plate 14 with energy rays such as laser beams along the periphery of the opening 12h. The energy storage device 100 can be manufactured as described above.

[0115] [Applications of energy storage devices]

[0116] The energy storage device 100 can be used for various purposes, and is particularly suitable for applications such as serving as a power source (drive power supply) for motors in mobile vehicles (typically passenger cars, trucks, etc.), where loads may be applied to the terminals (positive terminal 30 and / or negative terminal 40) during use. The type of vehicle is not particularly limited, but examples include plug-in hybrid electric vehicles (PHEVs), hybrid electric vehicles (HEVs), and battery electric vehicles (BEVs).

[0117] The present invention has been described above with reference to some embodiments, but these embodiments are merely examples. In addition, the present invention can be implemented in various other ways. The present invention can be implemented based on the content disclosed in this specification and common technical knowledge in the field. The technology described in the claims includes technologies that have undergone various modifications and alterations to the embodiments illustrated above. For example, a portion of the above embodiments can be replaced with other modifications, or other modifications can be added to the above embodiments. Furthermore, any technical feature that is not described as an essential technical feature can be appropriately deleted.

[0118] (1) Current collector and electrode tabs:

[0119] (1-1)

[0120] For example, in the above embodiment, the positive current collector 22c of the positive electrode 22 is a metal foil, specifically, an aluminum foil. Similarly, the negative current collector 24c of the negative electrode 24 is a metal foil, specifically, a copper foil. However, this is not a limitation. In a variation, the current collectors (positive current collector 22c and / or negative current collector 24c, preferably both) preferably have a structure comprising an insulating core (e.g., a resin layer) and a pair of metal layers formed on a pair of surfaces (both sides) of the core. While not particularly limited, the total thickness of the current collectors is preferably 20 μm or less, more preferably 10 μm or less.

[0121] The core is preferably made of resins such as polyethylene terephthalate (PET), nylon, polypropylene (PP), and polyethylene (PE). When the total thickness of the current collector is set to 100%, the thickness of the core is preferably 50% or more. This reduces the weight of the electrode body 20, and for example, when the electrode tabs (positive electrode tab 22t and / or negative electrode tab 24t) are positioned vertically downwards during use of the energy storage device 100, damage to the electrode tabs and electrode body 20 can be effectively suppressed. Furthermore, the metal layer is preferably made of materials such as aluminum, aluminum alloy, copper, copper alloy, nickel, nickel alloy, iron, or iron alloy.

[0122] (1-2)

[0123] Additionally, for example, in the above embodiment, the electrode tabs (positive electrode tab 22t and / or negative electrode tab 24t) are located in the region of the current collector (positive current collector 22c and / or negative current collector 24c) where the active material layer (positive active material layer 22a and / or negative active material layer 24a) is not formed. However, this is not a limitation. The electrode tabs may also be components different from the current collector. For example, if the current collector has a structure including a core and a pair of metal layers as described above, a conductive component made of metal foil or metal plate with a thickness greater than that metal layer may be installed on the metal layer portion, and this conductive component may be connected as an electrode tab to the current collector (positive current collector 50 and / or negative current collector 60).

[0124] (2) Separator:

[0125] (2-1)

[0126] Figure 10 This is an explanatory diagram of the assembly process involved in the first variation. Figure 10 The separator 180 shown has a positive electrode side support portion 185 and a negative electrode side support portion 186. The positive electrode side support portion 185 has a through hole 185h, and an opening portion 185n is provided on one side of the through hole 185h in the short side direction X. The negative electrode side support portion 186 has a through hole 186h, and an opening portion 186n is provided on one side of the through hole 186h in the short side direction X. The openings 185n and 186n are larger than the columnar shaft portions 52 and 62 of the first current collector (positive current collector 50 or negative current collector 60). In this case, in the assembly process (step 3), by means of... Figure 10 As shown by the middle arrow, the isolator 80 is slid (inserted) from the side of the first collector component, and the first collector component can be inserted through the through holes 85h and 86h via the openings 185n and 186n, and the isolator 180 is assembled on the first collector component.

[0127] In some embodiments, as in this modified example, the positive electrode side support 185 is preferably disposed between the positive electrode current collector 50 and the electrode body 20. Thus, the positive electrode side support 185 supports the electrode body 20 side surface of the positive electrode current collector 50. Alternatively, the negative electrode side support 186 is preferably disposed between the negative electrode current collector 60 and the electrode body 20. Thus, the negative electrode side support 186 supports the electrode body 20 side surface of the negative electrode current collector 60. When the positive electrode 22 is the "first electrode," the positive electrode side support 185 is an example of a "support portion that supports the electrode body side surface of the first current collector." When the negative electrode 24 is the "first electrode," the negative electrode side support 186 is an example of a "support portion that supports the electrode body side surface of the first current collector."

[0128] Furthermore, in this modified example, it is preferable that in the bonding process (step 5), the positive current collector 50 is bonded to the positive terminal 30 while the positive electrode support 185 presses the electrode body 20 side of the positive current collector 50 against the positive terminal 30 side. Alternatively, it is preferable that the negative current collector 60 is bonded to the negative terminal 40 while the negative electrode support 186 presses the electrode body 20 side of the negative current collector 60 against the negative terminal 40 side.

[0129] (2-2)

[0130] Additionally, for example, in the above-mentioned Figure 7A In this implementation, the spacer 80 is a single component. However, it is not limited to this. Figure 11 This is an explanatory diagram of the assembly process involved in the second variation. For example... Figure 11 As shown, the separator 280 has a first portion 281 and a second portion 282 divided along the short side direction X. In this case, during the assembly process in (step 3), it can also be done as follows: Figure 11 As shown by the middle arrow, the first current collector is sandwiched between the first portion 281 and the second portion 282 of the separator 280 from both sides in the short side direction X, and the separator 280 is assembled on the first current collector. In the second modification, similar to the first modification, the positive electrode side support 285 supports the surface of the positive electrode current collector 50 on the electrode body 20 side, and the negative electrode side support 286 supports the surface of the negative electrode current collector 60 on the electrode body 20 side.

[0131] In this modified example, the first part 281 has a protrusion 281c and a recess 281r on the surface opposite to the second part 282. The protrusion 281c and the recess 281r are provided at both ends in the long side direction Y. Although not shown in the figure, the second part 282 has a recess opposite to the protrusion 281c of the first part 281 and a protrusion opposite to the recess 281r of the first part 281. Therefore, in the assembly process (step 3), the protrusion 281c of the first part 281 is fitted with the recess of the second part 282, and the protrusion of the second part 282 is fitted with the recess 281r of the first part 281. Thus, the first part 281 and the second part 282 are integrated.

[0132] (3) Terminal shape:

[0133] For example, in the above Figure 2 In one embodiment, the terminals (positive terminal 30 and / or negative terminal 40) have through holes 30h and 40h. However, this is not the only option. Figure 12 This is a magnified view of a portion of the area near the positive terminal 130 in the modified example. For example... Figure 12 As shown, the positive terminal 130 has a thin-walled portion 130t. The thin-walled portion 130t is positioned opposite the shaft portion 152 of the positive current collector 150. In this case, during the joining process (step 5), the positive terminal 130 and the positive current collector 150 are joined (e.g., welded) through the thin-walled portion 130t of the positive terminal 130 to form a joint Jt.

[0134] (4) Terminal installation:

[0135] For example, in the above embodiment, in the housing preparation step (step 1A), terminals (positive terminal 30 and / or negative terminal 40) are pre-installed on the bottom wall 12a of the housing body 12. However, this is not a limitation. The terminals may also be installed on the bottom wall 12a in the joining step (step 5). In one example, firstly, in the insertion step (step 4), the first terminal (positive terminal 30 or negative terminal 40) and the first current collector (positive current collector 50 or negative current collector 60) are clamped into the portion of the lead-out holes 18 and 19 of the bottom wall 12a from the inside and outside of the housing body 12, and at least a portion of the current collector is inserted into the first through hole (through hole 30h or through hole 40h) of the terminal. Then, in the joining step (step 5), the first terminal is fixed from the outside by a clamp, and the first terminal and the first current collector are joined (e.g., welded). Thus, the first terminal (via an insulating component if necessary) can be installed on the bottom wall 12a approximately simultaneously with the formation of the joint J.

[0136] As described above, specific examples of the technology disclosed herein can be found in the following descriptions.

[0137] Item 1:

[0138] A method for manufacturing an energy storage device, wherein the energy storage device comprises: an electrode body including a first electrode and a second electrode; a housing housing the electrode body; and a first electrode terminal electrically connected to the first electrode via a first current collector, wherein the housing comprises: a bottomed cylindrical housing body having a bottom wall, a side wall disposed on the outer periphery of the bottom wall, and an opening opposite the bottom wall; and a sealing plate sealing the opening of the housing body, wherein the first electrode terminal is mounted on the bottom wall of the housing body. The method for manufacturing the energy storage device further includes an isolator disposed between the bottom wall and the electrode body. The method includes: an assembly step in which the isolator is disposed at one end of the electrode body on one side where the first current collector is mounted, and the first current collector and the isolator are integrated; an insertion step in which the electrode body, which is integrated with the isolator, is inserted into the interior of the housing body starting from one end; and a joining step in which the first current collector and the first electrode terminal are joined after the insertion step.

[0139] Item 2:

[0140] In the manufacturing method described in item 1, during the joining process, the first current collector and the first electrode terminal are joined by pressing the electrode body toward the bottom wall side and pressing the first current collector against the first electrode terminal via the separator.

[0141] Item 3:

[0142] In the manufacturing method described in item 2, the aforementioned isolator has a support portion that supports the electrode body side surface of the first current collector.

[0143] Item 4:

[0144] In any of the manufacturing methods described in items 1 to 3, the aforementioned separator has a through hole, and in the aforementioned assembly process, a portion of the aforementioned first current collector component passes through the aforementioned through hole of the aforementioned separator.

[0145] Item 5:

[0146] In any of the manufacturing methods described in items 1 to 4, the aforementioned spacer has a recess, and in the aforementioned assembly process, a portion of the aforementioned first current collector is fitted into the aforementioned recess of the aforementioned spacer.

[0147] Item 6:

[0148] In any of the manufacturing methods described in items 1 to 5, the aforementioned separator has a through hole, and one of a fitting recess and a fitting protrusion is provided on the inner sidewall of the through hole, and the other of the fitting recess and the fitting protrusion is provided on the outer peripheral sidewall of the aforementioned first current collector, and in the aforementioned assembly process, the aforementioned fitting recess and the aforementioned fitting protrusion are fitted together.

[0149] Item 7:

[0150] In any of the manufacturing methods described in items 1 to 6, one of a protrusion and a hole is provided on the bottom wall of the main body of the housing, and the other of a protrusion and a hole is provided on the side of the bottom wall of the separator. In the insertion process, the protrusion is inserted into the hole.

[0151] Item 8:

[0152] An energy storage device includes: an electrode body comprising a first electrode and a second electrode; a housing housing the electrode body; and a first electrode terminal electrically connected to the first electrode via a first current collector. The housing includes: a bottomed cylindrical housing body having a bottom wall, a side wall disposed on the outer periphery of the bottom wall, and an opening opposite the bottom wall; and a sealing plate sealing the opening of the housing body. The first electrode terminal is mounted on the bottom wall of the housing body. The device further includes a separator disposed between the bottom wall and the electrode body and integrated with the first current collector.

[0153] Item 9:

[0154] In the energy storage device described in item 8, the aforementioned insulating material has a through hole, and a portion of the aforementioned first current collector component passes through the through hole.

[0155] Item 10:

[0156] In the energy storage device described in item 8 or 9, the aforementioned insulating material has a recess, and a portion of the aforementioned first current collector engages with the aforementioned recess of the insulating material.

[0157] Item 11:

[0158] In any one of items 8 to 10, the energy storage device described therein has a through hole, and one of a fitting recess and a fitting protrusion is provided on the inner sidewall of the through hole, and the other of the fitting recess and the fitting protrusion is provided on the outer peripheral sidewall of the first current collector, wherein the fitting recess and the fitting protrusion are fitted together.

[0159] Item 12:

[0160] In any of the energy storage devices described in items 8 to 11, the aforementioned isolator has a support portion that supports the electrode body side surface of the first current collector.

[0161] Item 13:

[0162] In any of items 8 to 12, the energy storage device has one of a protrusion and a hole on the bottom wall of the main body of the housing, and the other of the protrusion and the hole is provided on the side of the bottom wall of the separator, with the protrusion inserted into the hole.

Claims

1. A method of manufacturing an electrical storage device, wherein the electrical storage device is provided with: an electrode body including a first electrode and a second electrode; a case that houses the electrode body; and a first electrode terminal that is electrically connected to the first electrode via a first current collecting member, the case is provided with: a bottomed cylindrical case main body having a bottom wall, a side wall provided to an outer peripheral edge of the bottom wall, and an opening opposed to the bottom wall; and a sealing plate that seals the opening of the case main body, wherein the first electrode terminal is attached to the bottom wall of the case main body, further provided with a separator disposed between the bottom wall and the electrode body, the method of manufacturing the electrical storage device includes: an assembly process of disposing the separator to an end portion of the electrode body on which the first current collecting member is attached, and integrating the first current collecting member and the separator; an insertion process of inserting the electrode body in a state of being integrated with the separator from the end portion on the one side into the inside of the case main body; and a joining process of joining the first current collecting member and the first electrode terminal after the insertion process.

2. The method of manufacturing the electrical storage device according to claim 1, wherein in the joining process, the first current collecting member and the first electrode terminal are joined in a state of being pressed against the first electrode terminal via the separator by pressing the electrode body to the bottom wall side.

3. The method of manufacturing the electrical storage device according to claim 2, wherein the separator has a support portion that supports a surface of the electrode body side of the first current collecting member.

4. The method of manufacturing the electrical storage device according to any one of claims 1 to 3, wherein the separator has a through hole, in the assembly process, a part of the first current collecting member passes through the through hole of the separator.

5. The method of manufacturing the electrical storage device according to any one of claims 1 to 3, wherein the separator has a recess portion, in the assembly process, a part of the first current collecting member is fitted into the recess portion of the separator.

6. The method of manufacturing the electrical storage device according to any one of claims 1 to 3, wherein the separator has a through hole, one of a fitting recess portion and a fitting protrusion portion is provided to an inner side wall of the through hole, the other of the fitting recess portion and the fitting protrusion portion is provided to an outer peripheral side wall of the first current collecting member, in the assembly process, the fitting recess portion and the fitting protrusion portion are fitted.

7. The method of manufacturing the electrical storage device according to any one of claims 1 to 3, wherein one of a protrusion portion and a hole portion is provided to the bottom wall of the case main body, the other of the protrusion portion and the hole portion is provided to a surface of the bottom wall side of the separator, in the insertion process, the protrusion portion is inserted into the hole portion. provided with: an electrode body including a first electrode and a second electrode; a case that houses the electrode body; and ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8. An electric power storage device, wherein ​ ​ ​ A first electrode terminal electrically connected to the first electrode via a first current collecting member, The housing includes: a bottomed cylindrical housing main body having a bottom wall, a side wall provided to an outer periphery of the bottom wall, and an opening opposed to the bottom wall; and a sealing plate that seals the opening of the housing main body, The first electrode terminal is attached to the bottom wall of the housing main body, Further, a partition is provided between the bottom wall and the electrode body and is integrated with the first current collecting member.

9. The power storage device according to claim 8, wherein The partition has a through-hole, A portion of the first current collecting member passes through the through-hole.

10. The power storage device according to claim 8 or 9, wherein The partition has a recess, A portion of the first current collecting member is fitted into the recess of the partition.

11. The power storage device according to claim 8, wherein The partition has a through-hole, One of a fitting recess and a fitting protrusion is provided to an inner side wall of the through-hole, The other of the fitting recess and the fitting protrusion is provided to an outer peripheral side wall of the first current collecting member, The fitting recess and the fitting protrusion are fitted.

12. The power storage device according to claim 8 or 9, wherein The partition has a support portion that supports a surface of the electrode body side of the first current collecting member.

13. The power storage device according to claim 8 or 9, wherein One of a protrusion and a hole is provided to the bottom wall of the housing main body, The other of the protrusion and the hole is provided to a surface of the bottom wall side of the partition, The protrusion is inserted into the hole.

Images