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. A power storage device (100) disclosed herein is provided with: an electrode body (20) including a first electrode (22); a housing (10); and a first electrode terminal (30) electrically connected to the first electrode (22) via a first conductive member (50). A case (10) is provided with: a bottomed cylindrical case body (12) having a bottom wall (12a) and an opening (12h) facing the bottom wall (12a); and a sealing plate (14) that seals the opening (12h) of the case body (12). The first electrode terminal (30) is attached to the bottom wall (12a) and has a through-hole (30h). The first conductive member (50) is inserted into the through hole (30h) and joined to 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 also describes a technique for joining an electrode tab (first conductive component) 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 conductive component and the first electrode terminal within the housing when they are joined, resulting in a high degree of difficulty in joining. Therefore, there is a need for a power storage device that stably connects the first conductive component 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, the following energy storage device is provided.

[0007] That is, 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 via a first conductive member.

[0008] The aforementioned 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 that seals the opening of the housing body.

[0009] The first electrode terminal is mounted on the bottom wall of the housing body and has a through hole.

[0010] The first conductive component is inserted into the through hole and engages with the first electrode terminal.

[0011] According to the above structure, the first conductive component and the first electrode terminal can be stably joined, thereby improving the conductivity reliability of the joint. Furthermore, a highly reliable energy storage device can be realized. Attached Figure Description

[0012] Figure 1 This is a perspective view schematically illustrating an energy storage device according to one embodiment.

[0013] Figure 2 It is along Figure 1 A schematic longitudinal section view of line II-II.

[0014] Figure 3 This is a schematic diagram showing the structure of the electrode.

[0015] Figure 4 yes Figure 2 A magnified view of the area near the positive end of the electrode.

[0016] Figure 5 It is a schematic top view representing the isolated object.

[0017] Figure 6 This is an explanatory diagram of the shell preparation process and the insertion process.

[0018] Figure 7 The variations involve the same principles as those in the example. Figure 5 A fairly accurate diagram.

[0019] Figure 8 The variations involve the same principles as those in the example. Figure 4 A fairly accurate diagram.

[0020] Figure 9 The first variation involves the following: Figure 4 A fairly accurate diagram.

[0021] Figure 10A , Figure 10B This is an explanatory diagram of the manufacturing process involved in the first variation.

[0022] Figure 11 The second variation involves the same... Figure 4 A fairly accurate diagram.

[0023] Figure 12A , Figure 12B This is an explanatory diagram of the manufacturing process involved in the second variation.

[0024] Figure 13 The third variation involves the following: Figure 4 A fairly accurate diagram.

[0025] Figure 14 The fourth variation involves the same... Figure 4 A fairly accurate diagram.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10…shell; 12…shell body; 12a…bottom wall; 14…sealing plate; 20, 120, 220, 320…electrode body; 22…positive electrode (first electrode / second electrode); 24…negative electrode (first electrode / second electrode); 27, 127, 227…positive electrode tab group (first conductive component); 30, 130, 230, 330, 430…positive terminal (first electrode terminal); 30h, 130h, 230h, 330h, 430h…through hole; 40…negative terminal; 50, 150, 250, 450…positive current collector (first conductive component); 60…negative current collector; 80, 180, 280, 380…isolation; 100…energy storage device. Detailed Implementation

[0028] 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".

[0029] [Electronic storage device]

[0030] 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 sectional view along line II-II. 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 for ease of explanation only and do not limit the arrangement of the energy storage device 100 in any way.

[0031] 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.

[0032] 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, and a negative current collector 60. Here, the energy storage device 100 also includes a separator 80 and a liquid electrolyte (electrolyte, omitted from the illustration). However, as described in the modified example (3) described later, the positive current collector 50, the negative current collector 60, and the separator 80 are not essential and may be omitted in other embodiments. 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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".

[0037] 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).

[0038] like Figure 1 , Figure 2 As shown, an electrolyte injection hole 15, an vent valve 17, and terminal outlet holes 18 and 19 are provided on the bottom wall 12a of the housing body 12. The electrolyte injection hole 15 is a through hole for injecting electrolyte into the interior of the housing 10 after the sealing plate 14 is assembled to the housing body 12. The electrolyte injection hole 15 is sealed by a sealing member 16 after electrolyte injection. Alternatively, the electrolyte injection hole 15 can also be provided on the sealing plate 14. The vent 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 vent valve 17 can also be provided on the sealing plate 14. The terminal outlet holes 18 and 19 are formed at both ends of the bottom wall 12a in the Y direction along its long side. The terminal outlet holes 18 and 19 penetrate the bottom wall 12a. The positive terminal 30 and the negative terminal 40 are respectively inserted into the terminal lead-out holes 18 and 19 on the bottom wall 12a, as will be described later.

[0039] The electrode body 20 is housed inside the housing 10. Furthermore, the number of electrode bodies 20 housed in a single housing 10 is not particularly limited; there can be one or more (e.g., two or more, three or more). Figure 2 As 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 3 This is a schematic diagram showing the structure of the electrode body 20. Furthermore, Figure 3 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 3 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 formed 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 around a winding shaft WL in the long side direction LD. However, the electrode body 20 may also be a stacked electrode body formed 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 3 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 described in the following variations (1-1), the positive current collector 22c may also have an insulating core (e.g., a resin layer).

[0043] like Figure 3As 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 3 (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 are integrated with the positive electrode 22. 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 current collector 22c is exposed. However, as described in the variations (1-2) below, the positive electrode tab 22t may also be a component different from the positive electrode 22. In the case where the positive electrode 22 is the "first electrode", the positive electrode tab 22t is an example of the "first electrode tab".

[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. In the case that the positive electrode 22 is the "first electrode", the positive electrode tab group 27 is an example of the "first electrode tab group".

[0045] like Figure 3 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 3As 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 3 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 3 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 3 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 3 (The left side) protrudes. Furthermore, the multiple negative electrode tabs 24t are of the same shape, each 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. In the case where the negative electrode 24 is the "first electrode," the negative electrode tab 24t is an example of the "first electrode tab."

[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 negative electrode 24 is connected (more specifically, joined) to the negative electrode 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 electrode current collector 60. In the case that the negative electrode 24 is the "first electrode", the negative electrode tab group 28 is an example of the "first electrode tab group".

[0050] like Figure 3 As 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 3 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 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 solid (solid electrolyte) and integrated with the electrode body 20.

[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 at one end of the bottom wall 12a along the long side in the Y direction. Figure 1 , Figure 2The negative terminal 40 is installed at the other end of the long side direction Y of the bottom wall 12a. Figure 1 , Figure 2 (The right end). The positive terminal 30 is inserted through the terminal lead-out hole 18 of the bottom wall 12a, with a portion protruding outside the housing 10. The negative terminal 40 is inserted through the terminal lead-out hole 19 of the bottom wall 12a, with a portion protruding outside the housing 10. 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 1 , 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 an insulating member (here, a washer 90). The terminals are fixed to the bottom wall 12a of the housing body 12 via the washer 90. The washer 90 is preferably made of resin. The terminals can also be mounted to the bottom wall 12a together with the washer 90 by an insert molding (one-piece molding) method. As a result, the tightness of the terminals, the washer 90, and the bottom wall 12a is improved, thereby improving sealing performance and reliability. However, in other embodiments, the terminals can also be fixed to the bottom wall 12a together with the washer 90 by riveting or other methods. For example, by connecting the terminals to an external conductive member disposed on the outer side of the housing body 12 using riveting and / or welding, the terminals can be fixed to the housing body 12. In addition, by connecting the terminals to an internal conductive member disposed on the inner side of the housing body 12 using riveting and / or welding, the terminals can be fixed to the housing body 12. Alternatively, it can be fixed to the bottom wall 12a via an adhesive layer (adhesive, etc.).

[0056] Furthermore, the following description will take the case where the positive electrode 22 is the "first electrode" as an example, but the negative electrode 24 side can also have the same structure. In this case, the following description of "positive electrode" can be appropriately changed to "negative electrode". The technology disclosed herein is more preferably applied to the positive electrode 22 side and the negative electrode 24 side respectively.

[0057] Figure 4This is a magnified view of a portion near the positive terminal 30. The positive terminal 30 is inserted through the terminal lead-out hole 18 in the bottom wall 12a, and extends from inside the housing body 12 ( Figure 4 (upper side) outward ( Figure 4 (The lower side) extends. A portion of the positive terminal 30 protrudes from the terminal lead-out hole 18 toward the outer surface of the bottom wall 12a, exposed outside the housing 10. The positive terminal 30 is electrically connected to the positive terminal 22 of the electrode body 20. Figure 4 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 and the positive electrode tab group 27 (multiple positive electrode tabs 22t). The positive terminal 30 is preferably made of metal, more preferably aluminum or an aluminum alloy. In this embodiment, the positive terminal 30 has a through hole 30h. The positive terminal 30 also has a cylindrical portion 31, an outer flange portion 32, and an inner flange portion 33.

[0058] The cylindrical portion 31 is disposed within the terminal lead-out hole 18. The cylindrical portion 31 extends in the vertical direction Z. Although not shown in the figure, the cylindrical portion 31 appears annular in a top view of the XY plane. That is, the cylindrical portion 31 has a cylindrical shape. The outer flange portion 32 is a portion connected to the lower end of the cylindrical portion 31 (the end on the outer surface side of the bottom wall 12a) and is larger in shape than the cylindrical portion 31. The outer flange portion 32 is disposed on the outer side (outer surface side of the bottom wall 12a) of the housing body 12, closer to the terminal lead-out hole 18. Figure 1 As shown, the outer flange 32 is approximately rectangular in a top view in the XY plane. The inner flange 33 is the portion connected to the upper end of the cylindrical portion 31 (the end on the electrode body 20 side) and is larger in shape than the cylindrical portion 31. The inner flange 33 is disposed on the inner side (electrode body 20 side) of the housing body 12 closer to the terminal lead-out hole 18. Here, the spacer 80 (described later) abuts against the inner flange 33. Furthermore, the outer flange 32 or the inner flange 33 can be larger in shape than the inner diameter of the terminal lead-out hole 18. Additionally, the shapes of the outer flange 32 and the inner flange 33 in a top view can also be circular.

[0059] A through-hole 30h penetrates the positive terminal 30 in the vertical Z direction. The through-hole 30h extends from the inside of the housing body 12 outwards. The through-hole 30h is provided along the terminal lead-out hole 18. According to... Figure 1 , Figure 4As can be seen, the through hole 30h is formed into a cylindrical shape. Preferably, the through hole 30h is circular in a top view of the XY plane. In this top view of the XY plane, the center of the through hole 30h coincides with the center of the outer flange 32 of the positive terminal 30. In this top view of the XY plane, the center of the through hole 30h coincides with the center of the inner flange 33 of the positive terminal 30. A positive current collector 50 (specifically, the second connecting portion 52, described later) is inserted through the through hole 30h.

[0060] 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. Figure 4 As shown, the positive electrode current collector 50 has a first connection portion 51 and a second connection portion 52. When the positive electrode 22 is the "first electrode", the positive electrode current collector 50 is an example of the "first conductive component".

[0061] A first connecting portion 51 is provided at the upper end of the positive electrode current collector 50 (the end on the electrode body 20 side). The first connecting portion 51 is mounted on the positive electrode tab group 27 (multiple positive electrode tabs 22t) and electrically connected to the positive electrode 22. The first connecting portion 51 is joined to the positive electrode tab group 27 (multiple positive electrode tabs 22t) (e.g., by ultrasonic welding). Here, the first connecting portion 51 is flat and extends along the inner surface of the bottom wall 12a. Figure 4 As shown, in the long side direction Y, the width of the first connecting portion 51 is wider than the width of the positive electrode tab group 27. The width of the first connecting portion 51 is wider than the width of the through hole 30h of the positive electrode 30.

[0062] The second connection portion 52 is provided at the lower end of the positive electrode current collector 50 (the end on the bottom wall 12a side). The second connection portion 52 is disposed on the side opposite to the positive electrode tab group 27, separated from the first connection portion 51. The second connection portion 52 is positioned to overlap with the positive electrode tab group 27 in a top view of the XY plane. The second connection portion 52 is inserted into the through hole 30h of the positive terminal 30. According to... Figure 1 , Figure 4As can be seen, the second connecting portion 52 is cylindrical, specifically, cylindrical in shape. The second connecting portion 52 is preferably circular in a top view from the XY plane. If both the second connecting portion 52 of the positive current collector 50 and the through hole 30h of the positive terminal 30 are circular in a top view from the XY plane, the insertability of the second connecting portion 52 and the airtightness of the through hole 30h after the second connecting portion 52 is inserted can be improved. Furthermore, the reliability of the energy storage device 100 can be improved.

[0063] Here, the second connecting portion 52 is smaller than the through hole 30h of the positive terminal 30 and is inserted into the through hole 30h of the positive terminal 30. As a result, the contact area between the positive terminal 30 and the positive current collector 50 can be increased. Therefore, the electrical connection between the positive terminal 30 and the positive current collector 50 is more stable and easier to maintain, and the conductivity reliability can be improved. However, the second connecting portion 52 can be any structure that can be inserted into the through hole 30h, and in other embodiments, it can also be a protrusion or the like. In addition, as also described in the modified example (3) described later, the second connecting portion 52 can also be in the form of a flat plate.

[0064] Here, the second connecting portion 52 extends outward from the inside of the housing 10. Here, the lower end of the second connecting portion 52 protrudes from the outside of the housing body 12 (on the outer surface of the bottom wall 12a). Here, the lower end of the second connecting portion 52 is housed within the through hole 30h. Here, the lower end face of the second connecting portion 52 is approximately coplanar with the outer flange portion 32 of the positive terminal 30 (manufacturing errors are permissible). Here, the second connecting portion 52 does not protrude from the through hole 30h. However, as also described in the modified example (3) described later, the second connecting portion 52 may protrude from the through hole 30h.

[0065] The positive current collector 50 is coupled to the positive terminal 30. In this embodiment, as... Figure 4 As shown, the periphery of the through hole 30h of the positive terminal 30 engages with the second connecting 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 engagement of the positive terminal 30 and the positive current collector 50 can be made more stable.

[0066] 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 1As shown, the junction J is annular (e.g., circular). The junction J is continuously provided around the periphery of the through hole 30h of the positive terminal 30 and the boundary portion of the second connection 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 junction J.

[0067] Furthermore, in this embodiment, the positive electrode 22 and the positive terminal 30 are electrically connected via the positive electrode current collector 50, which is a conductive component. However, as described in the modified example (3) below, in other embodiments, the positive electrode 22 may not be connected via the positive electrode current collector 50, for example, only via the positive electrode tab group 27, which is a conductive component, to the positive terminal 30.

[0068] The negative terminal 40 is electrically connected to the negative terminal 24 of the electrode body 20. Here, the negative terminal 40 has the same structure as the positive terminal 30. The negative terminal 40 has a through hole 40h (see reference). Figure 6 Here, the negative terminal 40 is electrically connected to the negative terminal 24 of the electrode body 20 via the negative current collector 60 and the negative electrode tab group 28 (a plurality of negative electrode tabs 24t). The negative terminal 40 is preferably made of metal, for example more preferably of copper or a copper alloy.

[0069] The negative current collector 60 is a conductive component that forms 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. The negative current collector 60 has a first connection portion 61 and a second connection portion 62 (see reference 60). Figure 6 In the case where the negative electrode 24 is the "first electrode", the negative electrode current collector 60 is an example of the "first conductive component".

[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. Figure 4As shown, the spacer 80 is disposed between the inner flange 33 of the positive terminal 30 fixed to the bottom wall 12a and the first connection portion 51 of the positive current collector 50. Typically, the spacer 80 is insulating and preferably made of resin. The material of the spacer 80 may also be the same as that shown in the example of the material used as the electrode support 29. Here, the spacer 80 is a single component. However, the spacer 80 may also be composed of multiple components disposed in separate positions. For example, a first spacer and a second spacer may be disposed on the positive terminal 30 side and the negative terminal 40 side, respectively.

[0071] Figure 5 This is a schematic top view representing the isolator 80. Figure 5 In the diagram, 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 using virtual lines. Figure 5 As shown, the spacer 80 has a flat base 89 and a pair of end through holes 85, 86. Here, the spacer 80 also has a central through hole 81.

[0072] like Figure 2 As shown, the base 89 extends along the bottom wall 12a of the housing body 12. In a top view in the XY plane, the shape of the base 89 is preferably approximately the same as or larger than the shape of the electrode body 20. Figure 5 As 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.

[0073] like Figure 2 As shown, the central through-hole 81 is located in the portion opposite to the electrolyte injection hole 15 and the vent valve 17 (the overlapping portion in the top view of the XY plane). Thus, in the vertical direction Z, the electrolyte injection hole 15 and the vent valve 17 are directly opposite the electrode body 20 (or electrode body support 29). A positive electrode current collector 50 (specifically, a columnar second connecting portion 52) is inserted through the end through-hole 85. A negative electrode current collector 60 (specifically, a columnar second connecting portion 62) is inserted through the end through-hole 86. Thus, the separator 80 is integrated (connected) with the electrode body 20 and the conductive components (positive electrode current collector 50 and / or negative electrode current collector 60).

[0074] The spacer 80 has a shape substantially the same as the inner surface of the sidewall of the housing body 12, and has end through holes 85 and 86 for the insertion of conductive components (positive current collector 50 and / or negative current collector 60). This facilitates the guidance of the electrode body 20 and the conductive components to the desired position during the insertion process (step 2) of the manufacturing method described later. That is, the spacer 80 can also function as a guide for the electrode body 20 and a positioning component for the conductive components. Furthermore, during the joining process (step 3) of the manufacturing method described later, the conductive components are stably contacted with the terminals (positive terminal 30 and / or negative terminal 40), facilitating easy joining.

[0075] [Manufacturing method of energy storage device]

[0076] The energy storage device 100 of this embodiment can be manufactured, for example, by a method including the following steps: (step 1A) housing preparation step, (step 1B) electrode preparation step, (step 2) insertion step, (step 3) joining step, and (step 4) 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 joining step (step 3) and the sealing step (step 4) is not particularly limited; they can be reversed or performed approximately simultaneously. Furthermore, 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 sealing step (step 4). Figure 6 This is an explanatory diagram of the shell preparation process (step 1A) and the insertion process (step 2). Furthermore, in Figure 6 In this process, considering the workability of the joining process described later (step 3), the bottom wall 12a of the housing body 12 is reversed and oriented upward in the vertical direction.

[0077] In the shell preparation process (step 1A), a shell body 12 and a sealing plate 14 are prepared. Specifically, a bottomed cylindrical shell 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 shell body 12 and the sealing plate 14 can be purchased from suppliers or manufactured in-house. In some embodiments, the shell body 12 is preferably as follows: Figure 6 As shown on the upper side, terminals (positive terminal 30 and / or negative terminal 40) are pre-installed on the bottom wall 12a. The terminals are preferably installed on the bottom wall 12a in a state of insulation from the bottom wall 12a via an insulating component (here, washer 90). The method of terminal installation is not particularly limited. Here, the terminals are pre-installed on the wall 12a together with the washer 90 by an insert molding (one-piece molding) method.

[0078] That is, the housing body 12 is prepared as an integrally molded product with the gasket 90 and the terminals (positive terminal 30 and / or negative terminal 40). However, in other embodiments, the terminals can be installed on the bottom wall 12a by riveting or the like, or by an adhesive layer (adhesive, etc.). In addition, as also described in the modified example (4) described later, the terminals do not necessarily need to be installed on the bottom wall 12a first, for example, they can be installed on the bottom wall 12a in the insertion process, joining process, etc. described later.

[0079] In the electrode preparation process (step 1B), electrode body 20 is prepared. Electrode body 20 can be a purchased product from 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 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 together, preferably joined together, to form an integrated positive electrode tab group 27. Similarly, multiple negative electrode tabs 24t are bundled together, preferably joined together, to form an integrated negative electrode tab group 28.

[0080] In the insertion process (step 2), after the housing preparation process, the electrode body 20, on which conductive components (positive current collector 50 and / or negative current collector 60) are mounted, is inserted into the housing body 12, and at least a portion of the conductive components is inserted into the through-hole 30h of the terminals (positive terminal 30 and / or negative terminal 40). In some embodiments, before inserting the electrode body 20 into the housing body 12, firstly, as in... Figure 6 As shown on the lower side, it is made into a composite containing an electrode body 20, a conductive component, and an insulator 80.

[0081] Specifically, for example, firstly, the first connecting portion 51 of the positive current collector 50 is installed onto the positive electrode tab group 27 of the electrode body 20 by welding such as ultrasonic welding, resistance welding, or laser welding. Similarly, the first connecting portion 61 of the negative current collector 60 is installed onto the negative electrode tab group 28 of the electrode body 20. Thus, the electrode body 20 and the conductive components (positive current collector 50 and / or negative current collector 60) are integrated (connected). Then, the electrode body 20 is covered by the electrode body support 29 (resin sheet, etc.).

[0082] Next, an insulator 80 with end through holes 85 and 86 is prepared, and the insulator 80 is connected to the conductive component. Here, the columnar second connecting portion 52 of the positive current collector 50 and the columnar second connecting portion 62 of the negative current collector 60 are respectively inserted into the end through holes 85 and 86 of the insulator 80. This integrates (connects) the electrode body 20 and the insulator 80. The insulator 80 is placed on the first connecting portion 51 of the positive current collector 50 and the first connecting portion 61 of the negative current collector 60.

[0083] Furthermore, in this embodiment, the two components are integrated (connected) by inserting the columnar second connecting portion 52 of the positive current collector 50 and the columnar second connecting portion 62 of the negative current collector 60 through the end through holes 85 and 86 of the separator 80. However, the method of integration is not limited to this. In other embodiments, the end through holes 85 and 86 may be replaced, or in addition to the end through holes 85 and 86, the separator 80 may also have portions (e.g., fitting recesses, fixing claws) for positioning the first connecting portion 51 of the positive current collector 50 and / or the first connecting portion 61 of the negative current collector 60. Moreover, the separator 80 and the conductive components (positive current collector 50 and / or negative current collector 60) may also be integrated (connected) via the fitting recesses and fixing claws.

[0084] Next, as Figure 6 As indicated by the middle arrow, the electrode body 20, integrated with the separator 80, is inserted into the interior of the housing body 12. Specifically, the electrode body 20 is inserted through the opening 12h of the housing body 12 with the side containing the conductive components (positive current collector 50 and / or negative current collector 60) facing the bottom wall 12a. As described above, in this embodiment, the separator 80 is configured such that its outer periphery abuts against or approaches the inner surface of the side walls (a pair of long side walls 12b and a pair of short side walls 12c) of the housing body 12. Therefore, the separator 80, inserted into the interior of the housing body 12, moves along the side walls 12b and 12c towards the bottom wall 12a. Thus, it is easy to maintain the electrode body 20 in a horizontal state, preventing, for example, the electrode body 20 from being received in an inclined state in the housing body 12, or from getting stuck on the side wall during movement. That is, the separator 80 of this embodiment functions as a guide member to guide the electrode body 20 to the desired placement position.

[0085] Furthermore, in this embodiment, as the spacer 80 moves along the side walls 12b and 12c of the housing body 12 towards the bottom wall 12a, the conductive components (positive current collector 50 and negative current collector 60) also move towards the bottom wall 12a, causing at least a portion of the conductive components to be inserted into the through holes 30h and 40h of the terminals (positive terminal 30 and negative terminal 40). Specifically, the columnar second connecting portion 52 of the positive current collector 50 is inserted into the through hole 30h of the positive terminal 30. Similarly, the columnar second connecting portion 62 of the negative current collector 60 is inserted into the through hole 40h of the negative terminal 40. This allows the conductive components to be stably inserted into the through holes of the terminals provided on the bottom wall 12a. In other words, the spacer 80 of this embodiment can also function as a positioning component that guides the conductive components to the desired engagement position. In addition, in this embodiment, the end face of the second connection portion 52 of the positive electrode current collector 50 is coplanar with the outer flange portion 32 of the positive electrode terminal 30.

[0086] In this embodiment, such as Figure 6 As shown, this process is performed with the bottom wall 12a of the housing body 12 facing upward in the vertical direction. Alternatively, for example, if the electrode body 20 is too 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) positioned vertically and the short or long side of the bottom wall 12a extending in the vertical direction.

[0087] In the (step 3) joining process, after the insertion process, the conductive components (positive current collector 50 and / or negative current collector 60) and terminals (positive terminal 30 and / or negative terminal 40) are joined. In this embodiment, the bottom wall 12a is held in a reversed position facing upward in the vertical direction, and the electrode body 20 is pressed against the bottom wall 12a from the opening 12h side to maintain the state in which the second connecting portion 52 of the positive current collector 50 is inserted into the through hole 30h of the positive terminal 30. Preferably, the end face of the second connecting portion 52 and the periphery of the through hole 30h of the positive terminal 30 are kept approximately coplanar. This allows the positive current collector 50 to reliably abut against the positive terminal 30. Moreover, the joining is performed at the position where the second connecting portion 52 of the positive current collector 50 inserted into the through hole 30h abuts against the positive terminal 30. In this embodiment, the front end of the second connecting portion 52 of the positive current collector 50 and the outer flange portion 32 of the positive terminal 30 are joined around the periphery of the through hole 30h of the positive terminal 30. This allows for a stable connection between the positive current collector 50 and the positive terminal 30.

[0088] The joining method is not particularly limited. In some embodiments, welding is preferably performed by irradiating the outer side of the housing body 12 (the outer surface side of the bottom wall 12a) with energy rays such as lasers. Since joining from the outer side of the housing body 12 allows for visual observation of the joint, it makes the conductive parts and terminals more stable and easier to join. In this embodiment, an annular (e.g., circular) joint J is formed along the through hole 30h.

[0089] In the sealing process (step 4), 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.

[0090] [Applications of energy storage devices]

[0091] 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).

[0092] 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.

[0093] (1) Current collector and electrode tabs:

[0094] (1-1)

[0095] 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.

[0096] 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.

[0097] (1-2)

[0098] 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 other conductive components (positive current collector 50 and / or negative current collector 60).

[0099] (2) Separator:

[0100] (2-1)

[0101] For example, in the above Figure 5 In one embodiment, the outer periphery of the spacer 80 (specifically the base 89) abuts or approaches the entire circumference of the sidewalls (a pair of long sidewalls 12b and a pair of short sidewalls 12c) of the housing body 12. However, it is not limited to this. Figure 7 The variations involve the same principles as those in the example. Figure 5 A fairly accurate diagram. Figure 7The spacer 180 shown, in addition to the flat base 189, central through hole 181, and end through holes 185 and 186, also has a first extension 189b extending from the base 189 toward a pair of opposing long sidewalls 12b, and a second extension 189c extending from the base 189 toward a pair of opposing short sidewalls 12c. In the spacer 180, the first extension 189b and the second extension 189c abut or approach a portion of the sidewall of the housing body 12. Even with this type of spacer 180, it can fully function as a guide member for the electrode body 20 and a positioning member for conductive members, as described above.

[0102] (2-2)

[0103] Additionally, for example, in the above embodiment, the base 89 of the spacer 80 is flat. However, it is not limited to this. Figure 8 The variations involve the same principles as those in the example. Figure 4 A comparable diagram. (For example...) Figure 8 As shown, the separator 280 has a thin-walled region A1 with a relatively thin thickness disposed around the periphery of the positive terminal 30 and the positive electrode tab group 27, and a thick-walled region A2 with a relatively thick thickness disposed away from the positive terminal 30 and the positive electrode tab group 27. This ensures a gap between the periphery of the positive terminal 30 and the positive electrode tab group 27, and between the electrode body 20 and the bottom wall 12a of the housing body 12. With this structure, during the manufacture and use of the energy storage device 100, when the bottom wall 12a of the housing body 12 is positioned vertically downwards, as... Figure 8 As indicated by the middle arrow, the weight of the electrode body 20 is applied to the thick-walled region A2. Therefore, the portion of the conduction path where the positive terminal 30 is mounted is appropriately protected from damage due to the weight of the electrode body 20. Furthermore, even when external forces such as vibration or impact are applied during the use of the energy storage device 100, the electrode body 20 is difficult to move towards the bottom wall 12a.

[0104] exist Figure 8 In a modified example, the gap between the electrode body 20 and the bottom wall 12a is divided into two regions in the vertical direction Z by the thin-walled region A1 of the separator 280. Specifically, in the vertical direction Z, a first space S1 is ensured between the electrode body 20 and the thin-walled region A1 of the separator 280, and a second space S2 is ensured between the thin-walled region A1 of the separator 280 and the bottom wall 12a. By ensuring the first space S1, damage to the positive electrode tab group 27 can be appropriately suppressed, improving conductivity reliability. Furthermore, by ensuring the second space S2, the tightness of the portion where the positive terminal 30 is installed, particularly the bottom wall 12a, the gasket 90, and the positive terminal 30, is easily maintained, improving sealing and reliability.

[0105] While not particularly limited, the thickness T1 of the thick-walled region A2 (its vertical length relative to the bottom wall 12a) is preferably at least 0.5 times, more preferably at least 0.6 times, and even more preferably at least 0.7 times, the distance D1 from the end face of the bottom wall 12a side of the electrode body 20 to the bottom wall 12a. Furthermore, in the long side direction Y, the width of the thin-walled region A1 is preferably longer than the width of the positive electrode tab group 27, and more preferably longer than the width of the first connection portion 51 of the positive electrode current collector 50. Additionally, the thickness T1 of the thick-walled region A2 is preferably at least 2 times, and more preferably at least 3 times, the thickness of the thin-walled region A1.

[0106] (2-3)

[0107] Additionally, for example, in the above embodiment, the separator 80 functions as a positioning member for the conductive components (positive current collector 50 and / or negative current collector 60). However, the positioning method for the conductive components is not limited to this. The separator 80 may also not function as a positioning member. In a variation, the electrode body support 29 may also function as a positioning member for the conductive components. In this case, the outer edge of the electrode body 20 enclosed by the electrode body support 29 preferably abuts against or approaches the inner surface of the side wall of the housing body 12. The gap between the outer edge of the electrode body 20 enclosed by the electrode body support 29 and the side wall of the housing body 12 (the difference between the internal dimension of the housing body 12 and the external dimension of the electrode body support 29) is preferably 1 mm or less, more preferably 0.8 mm or less, and even more preferably 0.5 mm or less. In addition, the electrode body support 29 preferably has an end through hole on the side where the conductive component (positive current collector 50 and / or negative current collector 60) is disposed, and the conductive component (more specifically, the second connection part of the through hole into which the terminal is inserted) passes through the end through hole.

[0108] (3) Conduction path:

[0109] Regarding the joint J, not limited to... Figure 4 The embodiment is described below. The joint J may also be formed inside the through hole 30h. In addition, the conduction path may be changed as in the following first to third modifications.

[0110] (3-1) First variation

[0111] Figure 9 The first variation involves the following: Figure 4 A comparable diagram. (For example...) Figure 9As shown, in this modified example, the inner flange 133 of the positive terminal 130 has a chamfered portion 133c at the corner on the through hole 130h side (the side connected to the cylindrical portion 131). This improves the insertion performance when the positive current collector 150 (specifically, the second connecting portion 152) is inserted into the through hole 130h. The chamfered portion 133c is continuously formed in the circumferential direction of the through hole 130h. The shape of the chamfered portion 133c is not particularly limited, but it can be, for example, a chamfered surface shape obtained by cutting the corner at a predetermined angle (e.g., 45 degrees) or a rounded arc surface shape after rounding the corner.

[0112] Furthermore, in this modified example, the outer flange 132 of the positive terminal 130 has a surface disposed on the side away from the bottom wall 12a of the housing body 12. Figure 9 The positive terminal 130 has a recess 132r on its lower side and a stepped portion 132s provided within the recess 132r. Here, the positive terminal 130 also has a cover member 139. Furthermore, here, the cover member 139 is part of the positive terminal 130, but the cover member 139 may not be part of the positive terminal 130.

[0113] A recess 132r is provided around the through hole 130h in a manner that surrounds it. In a top view in the XY plane, the recess 132r is approximately annular (more specifically, approximately circular). In a top view in the XY plane, the center of the recess 132r coincides with the center of the through hole 130h. The outer diameter of the recess 132r is larger than that of the through hole 130h. Here, the outer diameter of the recess 132r is larger than the outer diameter of the inner flange 133. A step portion 132s is provided on the inner surface of the recess 132r. In a top view, the step portion 132s is approximately annular (more specifically, approximately circular). A cover member 139 is fitted into the step portion 132s. The step portion 132s also functions as a standard indicating the position where the cover member 139 is fitted.

[0114] In this modified example, a junction J1 between the positive current collector 150 (first conductive member) and the positive terminal 130 (first electrode terminal) is provided within the recess 132r. Specifically, the junction J1 is provided on the bottom surface of the recess 132r (the surface opposite the cover member 139 in a portion of the outer flange 132). The junction J1 can be provided continuously (annularly) in the circumferential direction along the boundary portion of the second connection 152 between the positive terminal 130 and the positive current collector 150, or it can be composed of multiple point junctions arranged at circumferentially separated positions. By placing the junction J1 within the recess 132r, the junction J1 is less likely to protrude towards the outer surface of the bottom wall 12a. Therefore, it is possible to suppress interference between the junction J1 and other components, preventing damage or breakage.

[0115] The cover member 139 is configured to cover the junction J1 between the positive terminal 130 and the positive current collector 150. Here, the cover member 139 is a plate-shaped member. Here, the cover member 139 is conductive and preferably made of metal, for example, it may be made of the same type of metal as the outer flange 132. The cover member 139 is generally circular in shape. Here, the cover member 139 seals the opening of the recess 132r. By having the cover member 139, the airtightness within the housing 10 can be more reliably ensured. Here, the cover member 139 fits into the stepped portion 132s. The outer surface of the cover member 139 is generally coplanar with the lower end face of the outer flange 132 (more specifically, the portion of the outer periphery of the recess 132r).

[0116] A joint (e.g., a welded joint) 139w is formed at the outer periphery of the recess 132r and the fitting portion of the cover member 139. Here, the joint 139w is annular (e.g., circular) and is continuously provided around the entire circumference of the boundary between the outer periphery of the recess 132r and the cover member 139. As a result, the recess 132r is airtightly sealed. In addition, to improve the sealing performance of the fitting portion, a rubber or resin sealing member may be provided at the portion of the outer flange 132 that abuts against the cover member 139 (e.g., the outer periphery of the stepped portion 132s).

[0117] Furthermore, the cover member 139 is entirely housed within the recess 132r. By positioning the cover member 139 within the recess 132r, the protrusion height of the cover member 139 can be suppressed. Additionally, it is possible to prevent the cover member 139, the joint 139w from interfering with other components and thus avoiding damage or breakage.

[0118] Furthermore, in this modified example, the cover member 139 is mounted in the opening of the recess 132r in a flat plate shape, but the structure of the cover member is not limited to this. The cover member may also be cup-shaped, for example, having a protrusion and an outer edge portion that is provided around the periphery of the protrusion. A space is formed inside the protrusion. In this case, the protrusion of the cover member may also be placed over the joint J1 between the positive terminal 130 and the positive current collector 150, and the outer edge portion of the cover member may be joined to the outer flange portion 132 around the joint J1 (e.g., by welding).

[0119] Furthermore, in this variant example, such as Figure 9 As shown, no separator is provided between the bottom wall 12a and the electrode body 120. Here, the inner flange 133 of the positive terminal 130 fixed to the bottom wall 12a and the first connecting portion 151 of the positive current collector 150 are also in direct contact inside the housing body 12. However, it is also possible to have the above-described... Figure 4 The same implementation method is used, with a separator disposed between the bottom wall 12a and the electrode body 120.

[0120] In addition to the joining process (step 3) of the above-described embodiment, the manufacturing process involved in this variation also includes the cover installation process (step 3X). Figure 10A , Figure 10B This is an explanatory diagram of the manufacturing process involved in the first variation. Furthermore, in Figure 10A , Figure 10B In the image, a magnified view is shown of the vicinity of the positive terminal 130, which is a major component. Furthermore, here, the bottom wall 12a of the housing body 12 is in a reversed orientation, facing upwards in the vertical direction. In this modified example, as... Figure 10A As shown, a positive current collector 150, serving as a conductive component, is mounted on the electrode body 120 (specifically, the positive electrode tab group 127). More specifically, the positive electrode tab group 127 of the electrode body 120 is positioned at a location offset from the second connection portion 152 of the first connection portion 151. The positive electrode tab group 127 is positioned so as not to overlap with the second connection portion 152 in a top-view perspective of the XY plane. For example, by joining the positive electrode tab group 127 to a flat plate-like region in the first connection portion 151 where the second connection portion 152 is not formed, the first connection portion 151 and the positive electrode tab group 127 can be stably joined by ultrasonic bonding or the like.

[0121] In the insertion process (step 2), for example, the housing body 12 is reversed to an upward orientation with the bottom wall 12a facing vertically, such as... Figure 10A As shown by the middle arrow, the cylindrical second connecting portion 152 of the positive current collector 150 is inserted into the through hole 130h of the positive terminal 130. Figure 10B As shown, here, the end face of the second connecting portion 152 inserted into the through hole 130h is approximately coplanar with the bottom surface of the recess 132r. Here, the front end of the second connecting portion 152 does not protrude into the recess 132r or is disposed within the recess 132r.

[0122] In the (step 3) joining process, the positive current collector 150 (first conductive member) and the positive terminal 130 (first electrode terminal) are joined within the recess 132r. Specifically, the joining is performed at the point where the end face of the second connecting portion 152 of the positive current collector 150, which is inserted into the through hole 130h, abuts against the outer flange portion 132 of the positive terminal 130. The joining can be performed continuously in the circumferential direction along the boundary between the positive terminal 130 and the positive current collector 150, or it can be performed intermittently in the circumferential direction as point joints. Thus, a joining portion J1 (see reference) is formed within the recess 132r. Figure 9 ).

[0123] In the cover installation process (step 3X), after the joining process, the cover member 139 covers the joint J1 between the positive current collector 150 (first conductive member) and the positive terminal 130 (first electrode terminal). Specifically, the cover member 139 is fitted into the stepped portion 132s of the recess 132r, joining the outer periphery of the recess 132r and the cover member 139. The joining method is not particularly limited. In some embodiments, welding is preferably performed by irradiating the fitting portion between the outer flange portion 132 and the cover member 139 with energy rays such as laser beams along the periphery of the recess 132r. The joining is preferably performed continuously in the circumferential direction along the boundary between the outer flange portion 132 and the cover member 139. Thus, the joint portion 139w (see reference) is formed. Figure 9 ) to seal the recess 132r.

[0124] (3-2) Second variation

[0125] Figure 11 The second variation involves the same... Figure 4 A comparable diagram. (For example...) Figure 11 As shown, in this modified example, a positive current collector 250, serving as a conductive component, is mounted on the electrode body 220 (specifically, the positive electrode tab group 227). Unlike the first modified example described above, the positive current collector 250 is formed by bending a plate-shaped component. Otherwise, this modified example is the same as the first modified example. In this modified example, to more reliably ensure airtightness, it is preferable that, as in the first modified example, the positive terminal 230 has a cover component 239.

[0126] The positive current collector 250 of this modification has a first connecting portion 251 and a second connecting portion 252. The second connecting portion 252 has an extension 252e extending from the first connecting portion 251 and inserted into the through hole 230h of the positive terminal 230, and a bent portion 252b bending from the extension 252e. The extension 252e extends along the through hole 230h. Here, the bent portion 252b extends along the first connecting portion 251 (generally horizontal with the first connecting portion 251). The bent portion 252b abuts against the bottom surface of the recess 232r of the positive terminal 230. The bent portion 252b engages with the bottom surface of the recess 232r (part of the outer flange 232) outside the housing body 12. A joint J2 between the positive terminal 230 and the positive current collector 250 (conductive member) is provided on the bottom surface of the recess 232r.

[0127] The manufacturing process involved in this variation includes a bending process (step 2X) after the insertion process (step 2) in the first variation described above. Figure 12A , Figure 12B This is an explanatory diagram of the manufacturing process involved in the second variation. Furthermore, in Figure 12A , Figure 12BIn the image, a magnified view is shown of the vicinity of the positive terminal 230, which is a major component. Furthermore, here, the bottom wall 12a of the housing body 12 is in a reversed orientation, facing upwards in the vertical direction. In this modified example, during the insertion process (step 2), as... Figure 12A As shown, the flat second connecting portion 252 of the positive current collector 250 is inserted into the through hole 230h of the positive terminal 230. The front end of the second connecting portion 252 protrudes from the through hole 230h and extends within the recess 232r.

[0128] In the bending process (step 2X), after the insertion process, as follows: Figure 12B The positive current collector 250 (first conductive member) is deformed as shown. Specifically, the portion (front end portion) protruding from the through hole 230h of the second connecting portion 252 is bent. Here, the front end portion of the second connecting portion 252 is bent to be approximately L-shaped relative to the bottom surface of the recess 232r. As a result, a bent portion 252b is formed at the front end of the extension 252e.

[0129] In the joining process (step 3), after the bending process, the deformed positive current collector 250 is brought into contact with the positive terminal 230 (first electrode terminal) to join it. Specifically, the bent portion 252b of the positive current collector 250 is brought into contact with the bottom surface of the recess 232r of the positive terminal 230 and with the outer flange portion 232 (see reference). Figure 11 ) Joining. Thus, a joining portion J2 is formed within the recess 232r (see reference). Figure 11 By providing the bending portion 252b as in this modified example, the positive current collector 250 and the positive terminal 230 can be connected more stably. Furthermore, even when an external force is applied during the use of the energy storage device 100, the load applied to the connection portion J2 can be reduced because the second connection portion 252 can flex to absorb the external force. Consequently, the conductivity reliability of the connection portion J2 can be improved.

[0130] In the cover installation process (step 3X), after the joining process, the cover component 239 is joined to the stepped portion 232s of the recess 232r (see reference) in the same manner as in the first modified example described above. Figure 11 The outer flange 232 and the cover member 239 are joined along the periphery of the recess 232r to form the joint 239w (see reference). Figure 11 ).

[0131] (3-3) Third variation

[0132] Figure 13 The third variation involves the following: Figure 4 A comparable diagram. (For example...) Figure 13As shown, in this modified example, the positive terminal 330 has a cylindrical portion 331, an outer flange portion 332, and a through hole 330h. Here, the positive terminal 330 does not have an inner flange portion. Furthermore, in this modified example, no positive current collector is installed on the electrode body 320 (no positive current collector is clamped), and a group of positive electrode tabs 327, consisting of multiple positive electrode tabs 322t, is directly inserted into the through hole 330h of the positive terminal 330. In this modified example, the group of positive electrode tabs 327 is an example of a "first conductive component".

[0133] The protruding length (vertical length protruding from the root) of the positive electrode tab 322t can be, for example, 5 mm or more, or 10 mm or more. Multiple positive electrode tabs 322t can also be integrated with each other by welding or other joining methods before being inserted into the through hole 330h of the positive terminal 330. Furthermore, in this modified example, to more reliably ensure a tight seal, it is preferable that the positive terminal 330 has a cover member 339, similar to the first and second modified examples described above.

[0134] The positive electrode tab group 327 is inserted into the through hole 330h of the positive terminal 330. Similar to the second connection portion 252 of the positive current collector 250 in the second modification, the positive electrode tab group 327 has an extension portion 327e and a bent portion 327b that bends from the extension portion 327e. The bent portion 327b abuts against the bottom surface of the recess 332r of the positive terminal 330. The bent portion 327b engages with the positive terminal 330. In detail, the bent portion 327b engages with the bottom surface of the recess 332r (part of the outer flange portion 332) on the outside of the housing body 12. A joint portion J3 for the positive terminal 330 and the positive electrode tab group 327 (conductive member) is provided on the bottom surface of the recess 332r.

[0135] The manufacturing process involved in this modification is the same as that in the second modification, except that the conductive component (positive current collector 250) in the second modification becomes the positive electrode tab group 327. For example, in the insertion process (step 2), the positive electrode tab group 327 (first electrode tab group) is inserted into the through hole 330h of the positive terminal 330 (first electrode terminal). In the bending process (step 2X), the positive electrode tab group 327 is deformed to form a bent portion 327b at the front end of the extension 327e. In the joining process (step 3), the bent portion 327b of the positive electrode tab group 327 is brought into contact with the positive terminal 330 to join with the positive terminal 330. In addition, in the cover installation process (step 3X), similar to the first and second variations described above, the cover component 339 is fitted with the step portion 332s of the recess 332r, and the outer flange portion 332 and the cover component 339 are joined along the periphery of the recess 332r to form the joint portion 339w.

[0136] Furthermore, in this modified example, the positive electrode tab group 327 is directly connected to the positive terminal 330. However, for example, another (second) conductive component may be installed at the front end of the bent portion 327b, thereby connecting the second conductive component to the positive terminal 330. By providing the bent portion 252b as in this modified example, the positive electrode tab group 327 or the second conductive component connected thereto can more stably abut against the positive terminal 30. In addition, even when an external force is applied during the use of the energy storage device 100, the load applied to the joint J3 can be reduced. Furthermore, the conductivity reliability of the joint J3 can be improved.

[0137] Furthermore, in this modified example, the above-mentioned Figure 4 The same implementation method is used, with a spacer 380 disposed between the bottom wall 12a of the housing body 12 and the electrode body 320. A portion of the spacer 380 is disposed within the through hole 330h of the positive terminal 330. That is, the spacer 380 has a support portion 380s that supports at least a portion of the positive electrode tab group 327. The support portion 380s extends from the base 389 of the spacer 380 along the positive electrode tab group 327 (specifically, the extension 327e). Here, the support portion 380s does not protrude into the recess 332r. The support portion 380s is inserted into the through hole 330h of the positive terminal 330 in a state where it supports at least a portion of the positive electrode tab group 327. As a result, damage or breakage of the positive electrode tab group 327 can be suppressed.

[0138] (3-4) Fourth variation

[0139] Figure 14 The fourth variation involves the same... Figure 4 A comparable diagram. (For example...) Figure 14 As shown, in this modified example, compared with the above... Figure 4 The implementation method differs; in a top view on the XY plane, the center of the through hole 430h of the positive terminal 430 is offset from the center of the outer flange portion 432 of the positive terminal 430. To connect external connecting components such as busbars, a region Aw is ensured on one side of the outer flange portion 432 in the long side direction Y that is wider than on the other side in the long side direction Y.

[0140] Furthermore, in this modified example, the cylindrical portion 431 of the positive terminal 430 has a chamfered portion 431c at the corner (the portion that can initially contact the positive current collector 450) on the side of the through hole 430h. This improves the insertion performance when the positive current collector 450 is inserted into the through hole 430h. The chamfered portion 431c is continuously formed in the circumferential direction of the through hole 430h. The shape of the chamfered portion 431c is not particularly limited, but it can be, for example, a chamfered surface shape obtained by cutting the corner at a predetermined angle (e.g., 45 degrees) or a rounded arc surface shape after rounding the corner.

[0141] Furthermore, in this modified example, the above-mentioned Figure 4 In a different implementation, the columnar second connecting portion 452 of the positive electrode current collector 450 protrudes significantly outward from the through hole 430h of the positive terminal 430. Therefore, in this modified example, a joint portion J4 is formed on the outside of the housing body 12, and at the middle portion of the columnar second connecting portion 452. The second connecting portion 452 has a protrusion 452p at its front end (the end opposite to the first connecting portion 451). Thus, in the joining process (step 3), the protrusion 452p can be pulled to suitably abut against the outer flange portion 432 of the positive terminal 430. For ease of handling, the length of the protrusion 452p protruding from the through hole 430h is preferably 1 mm or more (e.g., 1 to 10 mm), more preferably 3 to 5 mm.

[0142] To facilitate pulling during the joining process, a notch 452n (including a neck, recess, etc.) is provided in the protrusion 452p. The notch 452n is located on the front end side (away from the first connecting part 451) of the joining part J4. Furthermore, the front end of the protrusion 452p is a rounded arc surface shape with rounded corners. This improves the insertion smoothness when the second connecting part 452 is inserted into the through hole 430h. Additionally, it prevents the protrusion 452p from interfering with other components and causing damage or breakage. Regarding the arc surface shape, when the diameter of the cylindrical second connecting part 452 is set to 1, R is preferably 0.1 to 0.5.

[0143] (4) Terminal installation:

[0144] For example, in the above Figure 6 In this embodiment, during the housing preparation process (step 1A), terminals (positive terminal 30 and / or negative terminal 40) are pre-installed on the bottom wall 12a of the housing body 12. That is, the housing body 12 is prepared as an integrally molded article with the gasket 90 and the terminals (positive terminal 30 and / or negative terminal 40). However, this is not the only possibility. For example, the terminals can also be installed on the bottom wall 12a during the joining process (step 3). In one example, firstly, during the insertion process (step 2), portions of the terminal lead-out holes 18 and 19 of the bottom wall 12a are inserted from the inside and outside of the housing body 12 through the terminals (positive terminal 30 and / or negative terminal 40) and conductive components (positive current collector 50 and / or negative current collector 60), and at least a portion of the conductive components is inserted into the through holes 30h and 40h of the terminals. Then, during the joining process (step 3), the terminals and conductive components are joined (e.g., welded). Thus, the terminal (via an insulating component if necessary) can be installed on the bottom wall 12a approximately simultaneously with the formation of the joint J.

[0145] As described above, specific examples of the technology disclosed herein can be found in the following descriptions.

[0146] Item 1:

[0147] 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 conductive member. 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 and has a through hole, and the first conductive member is inserted into the through hole and engages with the first electrode terminal.

[0148] Item 2:

[0149] In the energy storage device described in item 1, the first electrode has a first electrode tab, and a first current collector serving as the first conductive member is installed on the first electrode tab. The first current collector is inserted into the through hole of the first electrode terminal and engages with the first electrode terminal.

[0150] Item 3:

[0151] In the energy storage device described in item 1, the first electrode has a first electrode tab group comprising a plurality of first electrode tabs, the first electrode tab group being inserted into the through hole of the first electrode terminal, and the first electrode tab group or a conductive component connected to the first electrode tab group being engaged with the first electrode terminal.

[0152] Item 4:

[0153] In any one of items 1 to 3, the first electrode terminal has a recess on the side away from the bottom wall, and the joint between the first conductive member and the first electrode terminal is provided in the recess.

[0154] Item 5:

[0155] In any one of items 1 to 4, the energy storage device further comprises a cover member that covers the junction between the first conductive member and the first electrode terminal.

[0156] Item 6:

[0157] In any one of items 1 to 5, the energy storage device further comprises a separator disposed between the bottom wall and the electrode body.

[0158] Item 7:

[0159] 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 conductive member, the housing comprising: 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 housing body. The aforementioned bottom wall has a through hole, the aforementioned first conductive component is inserted into the through hole and engaged with the aforementioned first electrode terminal, and the manufacturing method of the aforementioned energy storage device includes: a housing preparation step, preparing the aforementioned housing body and the aforementioned sealing plate; an insertion step, after the aforementioned housing preparation step, inserting the aforementioned electrode body on which the aforementioned first conductive component is installed into the interior of the aforementioned housing body, and inserting at least a portion of the aforementioned first conductive component into the aforementioned through hole of the aforementioned first electrode terminal; and a joining step, after the aforementioned insertion step, joining the aforementioned first conductive component and the aforementioned first electrode terminal.

[0160] Item 8:

[0161] In the manufacturing method described in item 7, the first electrode has a first electrode tab, and a first current collector serving as the first conductive member is installed on the first electrode tab. In the insertion step, the first current collector is inserted into the through hole of the first electrode terminal, and in the joining step, the first current collector and the first electrode terminal are joined.

[0162] Item 9:

[0163] In the manufacturing method described in item 7, the first electrode has a first electrode tab group comprising a plurality of first electrode tabs. In the insertion step, the first electrode tab group is inserted into the through hole of the first electrode terminal. In the joining step, the first electrode tab group or a conductive component connected to the first electrode tab group is joined to the first electrode terminal.

[0164] Item 10:

[0165] In the manufacturing method of any one of items 7 to 9, the first electrode terminal has a recess on the side away from the bottom wall, and in the joining process, the first conductive member and the first electrode terminal are joined in the recess.

[0166] Item 11:

[0167] The manufacturing method according to any one of items 7 to 10 further includes: a cover installation step after the above-mentioned joining step, wherein the cover member covers the joint between the first conductive member and the first electrode terminal.

[0168] Item 12:

[0169] In any one of items 7 to 11, the energy storage device further includes a spacer disposed between the bottom wall and the electrode body. In the insertion step, after the electrode body with the first conductive component installed is integrated with the spacer, the electrode body, which is integrated with the spacer, is inserted into the housing body.

[0170] Item 13:

[0171] In any one of items 7 to 12, after the insertion step, the first conductive member is deformed, and in the joining step, the deformed first conductive member abuts against the first electrode terminal and joins with the first electrode terminal.

Claims

1. An energy storage device, wherein, have: An electrode body comprising a first electrode and a second electrode; A housing that houses the electrode body; and The first electrode terminal is electrically connected to the first electrode via a first conductive component. The housing includes: A bottomed cylindrical shell body has 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, which seals the opening of the main body of the housing. The first electrode terminal is mounted on the bottom wall of the housing body and has a through hole. The first conductive component is inserted into the through hole and engages with the first electrode terminal.

2. The energy storage device according to claim 1, wherein, The first electrode has a first electrode tab. A first current collector, serving as the first conductive component, is installed on the first electrode tab. The first current collector is inserted into the through hole of the first electrode terminal and engages with the first electrode terminal.

3. The energy storage device according to claim 1, wherein, The first electrode has a first electrode tab group comprising a plurality of first electrode tabs. The first electrode tab group is inserted into the through hole of the first electrode terminal. The first electrode tab group or the conductive component connected to the first electrode tab group is engaged with the first electrode terminal.

4. The energy storage device according to any one of claims 1 to 3, wherein, The first electrode terminal has a recess on the side away from the bottom wall. The junction between the first conductive component and the first electrode terminal is disposed within the recess.

5. The energy storage device according to any one of claims 1 to 3, wherein, It further includes a cover component that covers the junction between the first conductive component and the first electrode terminal.

6. The energy storage device according to any one of claims 1 to 3, wherein, It further includes a separator disposed between the bottom wall and the electrode body.

7. A method for manufacturing an energy storage device, wherein, The energy storage device includes: An electrode body comprising a first electrode and a second electrode; A housing that houses the electrode body; and The first electrode terminal is electrically connected to the first electrode via a first conductive component. The housing includes: A bottomed cylindrical shell body has 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, which seals the opening of the main body of the housing. in, The first electrode terminal is mounted on the bottom wall of the housing body and has a through hole. The first conductive component is inserted into the through hole and engages with the first electrode terminal. The method for manufacturing the energy storage device includes: The shell preparation process includes preparing the shell body and the sealing plate. In the insertion process, after the housing preparation process, the electrode body on which the first conductive component is installed is inserted into the interior of the housing body, and at least a portion of the first conductive component is inserted into the through hole of the first electrode terminal; as well as The joining process involves joining the first conductive component and the first electrode terminal after the insertion process.

8. The method for manufacturing an energy storage device according to claim 7, wherein, The first electrode has a first electrode tab. A first current collector, serving as the first conductive component, is installed on the first electrode tab. In the insertion process, the first current collector is inserted into the through hole of the first electrode terminal. In the joining process, the first current collector and the first electrode terminal are joined together.

9. The method for manufacturing an energy storage device according to claim 7, wherein, The first electrode has a first electrode tab group comprising a plurality of first electrode tabs. In the insertion process, the first electrode tab group is inserted into the through hole of the first electrode terminal. In the bonding process, the first electrode tab group or the conductive component connected to the first electrode tab group is bonded to the first electrode terminal.

10. A method for manufacturing an energy storage device according to any one of claims 7 to 9, wherein, The first electrode terminal has a recess on the side away from the bottom wall. In the joining process, the first conductive component and the first electrode terminal are joined within the recess.

11. A method for manufacturing an energy storage device according to any one of claims 7 to 9, wherein, It further includes: a cover installation process after the bonding process, in which a cover component covers the junction between the first conductive component and the first electrode terminal.

12. The method for manufacturing an energy storage device according to any one of claims 7 to 9, wherein, The energy storage device further includes a separator disposed between the bottom wall and the electrode body. In the insertion process, after the electrode body with the first conductive component installed is integrated with the isolator, the electrode body, which is integrated with the isolator, is inserted into the housing body.

13. The method for manufacturing an energy storage device according to any one of claims 7 to 9, wherein, After the insertion process, the first conductive component is deformed. In the joining process, the deformed first conductive component is brought into contact with the first electrode terminal to join the first electrode terminal.

Images