Secondary battery manufacturing method and secondary battery

Abstract

The invention provides a secondary battery manufacturing method and a secondary battery. In the secondary battery, a first separator is disposed at a first opening of a case main body and between a first sealing plate and an electrode body, the first separator includes a first convex portion facing a first electrode sheet, and the first electrode sheet is bent so as to have a curved portion recessed at a position facing the first convex portion. With this configuration, the energy density of the secondary battery can be improved, and the secondary battery can be stably manufactured.

Description

Technical Field The present technology relates to a method for manufacturing a secondary battery and the secondary battery. Background Art Japanese Patent No. 4537353 discloses a square secondary battery in which an electrode group (25) is housed in a casing (14) having openings (14a, 14b) at both ends and electrode terminals (21, 23) are respectively attached to cover plates (33, 33') for sealing the openings (14a, 14b). In the secondary battery described in Japanese Patent No. 4537353, there is still room for improving the energy density and stably manufacturing the secondary battery. Summary of the invention The present technology has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a secondary battery and a secondary battery that can improve energy density and can be manufactured stably. The present technology provides the following secondary batteries.

[0001] A secondary battery, comprising: an electrode body, each of which includes a first electrode and a second electrode having a polarity different from that of the first electrode; and a shell, which accommodates the electrode body, the shell including: a shell body having a first opening at one end; and a first sealing plate, the first sealing plate sealing the first opening, the electrode body including a first electrode sheet and a third electrode sheet electrically connected to the first electrode at the end on the first sealing plate side, the first electrode sheet and the third electrode sheet being electrically connected to the first electrode in a bent state, the first electrode sheet having a first recessed portion that is recessed in a bent state, and the third electrode sheet having a third recessed portion that is recessed in a bent state, a first separator being arranged at the first opening of the shell body and between the first sealing plate and the electrode body, the first separator having a first protrusion that is opposed to the first electrode sheet, the first protrusion being positioned to be opposed to the first recessed portion.

[0002] In the secondary battery described in [1], the first recess is provided on the outer surface of the first electrode sheet on the side close to the shell body, the third recess is provided on the outer surface of the third electrode sheet on the side close to the shell body, the first insulating member is located between the shell body and the first electrode sheet, and the first insulating member is not located between the shell body and the third electrode sheet.

[0003] In the secondary battery described in [1] or [2], the first electrode sheet and the third electrode sheet are electrically connected to the first electrode in a state where they are bent in opposite directions to each other.

[0004] In the secondary battery described in any one of [1] to [3], the first separator has a second protrusion facing the third electrode sheet, and the second protrusion is positioned to face the second recess.

[0005] In the secondary battery described in [4], the first recess is provided on the outer surface of the first electrode sheet on the side close to the shell body, and the third recess is provided on the outer surface of the third electrode sheet on the side close to the shell body, and the first insulating member is located between the shell body and the first electrode sheet, and between the shell body and the third electrode sheet.

[0006] In the secondary battery described in any one of [1] to [5], the first recess is provided on the outer surface of the first electrode sheet on the side close to the third electrode sheet, the third recess is provided on the outer surface of the third electrode sheet on the side close to the first electrode sheet, and the first insulating member is arranged between the first electrode sheet and the third electrode sheet.

[0007] In the secondary battery described in any one of [1] to [6], the first electrode sheet has a first bent portion on the outer surface where the first recess is formed, on the side closer to the first sealing plate than the first recess, and the third electrode sheet has a second bent portion on the outer surface where the third recess is formed, on the side closer to the first sealing plate than the third recess.

[0008] In the secondary battery described in any one of [1] to [7], the electrode body and the first separator are surrounded by an insulating sheet, and the insulating sheet is connected to the first separator.

[0009] In the secondary battery described in any one of [1] to [8], the shell includes a second sealing plate, the shell body has a second opening at the end on the side opposite to the first opening, the second opening is sealed by the second sealing plate, and the electrode body has a second electrode sheet and a fourth electrode sheet electrically connected to the second electrode at the end on the second sealing plate side, respectively, and the second electrode sheet and the fourth electrode sheet are electrically connected to the second electrode in a bent state.

[0010] In the secondary battery described in [9], the second electrode sheet has a second recessed portion that is sunken in a bent state, the fourth electrode sheet has a fourth recessed portion that is sunken in a bent state, and a second insulating member is arranged at the second opening of the shell body and between the second sealing plate and the electrode body. The second insulating member has a second protrusion that is opposite to the second electrode sheet and a fourth protrusion that is opposite to the fourth electrode sheet, the second protrusion is positioned opposite to the second recessed portion, and the fourth protrusion is positioned opposite to the fourth recessed portion. The present technology provides the following method for manufacturing a secondary battery.

[0011] A method for manufacturing a secondary battery, the secondary battery comprising: an electrode body, each of which includes a first electrode and a second electrode having a polarity different from that of the first electrode; and a shell, the shell accommodating the electrode body, the shell including: a shell body having a first opening at one end; and a first sealing plate, the first sealing plate sealing the first opening, the first electrode body including a first electrode sheet and a third electrode sheet electrically connected to the first electrode at the end on the first sealing plate side, the first electrode sheet and the third electrode sheet electrically connected to the first electrode in a bent state, the first electrode sheet having a first recessed portion that is recessed in a bent state, and the third electrode sheet having a first recessed portion that is recessed in a bent state. A second recessed portion is recessed in a state of being in a closed state, a first insulating member is arranged at the first opening of the shell body and between the first sealing plate and the electrode body, the first insulating member has a first convex portion opposite to the first electrode sheet, and the first convex portion is positioned to be opposite to the first recessed portion, wherein the manufacturing method of the secondary battery comprises the following steps, namely: a first connecting step of connecting the first electrode sheet and the third electrode sheet to the first sealing plate; and an electrode sheet bending step of, after the first connecting step, bending the first electrode sheet to form the first recessed portion, and bending the third electrode sheet to form the third recessed portion, by bringing the first sealing plate close to the main body of the electrode body.

[0012] In the secondary battery manufacturing method described in

[11] , in the electrode tab bending step, the first recessed portion is formed while the first protruding portion of the first separator is in contact with the first electrode tab.

[0013] In the secondary battery manufacturing method described in

[11] or

[12] , the first insulating member has a second protrusion opposite to the third electrode sheet, and in the electrode sheet bending step, the second concave portion is formed while the second protrusion of the first insulating member is in contact with the third electrode sheet.

[0014] In the method for manufacturing a secondary battery according to any one of

[11] to

[13] , in the electrode sheet bending step, the second recess is formed while a jig is brought into contact with the third electrode sheet.

[0015] In the method for manufacturing a secondary battery described in any one of

[11] to

[14] , there is a step of configuring the first insulating member on the end face of one side of the electrode body where the first electrode sheet and the third electrode sheet are provided, and covering the electrode body and the first insulating member with an insulating sheet.

[0016] In the method for manufacturing a secondary battery described in any one of

[11] to

[15] , the secondary battery is configured as follows: the shell includes a second sealing plate, the shell body has a second opening at an end portion on the side opposite to the first opening, the second opening is sealed by the second sealing plate, the electrode body has a second electrode sheet and a fourth electrode sheet electrically connected to the second electrode at the end portion on the second sealing plate side, the second electrode sheet and the fourth electrode sheet are electrically connected to the second electrode in a bent state, and the second electrode sheet has a The fourth electrode sheet has a fourth recessed portion which is recessed in a bent state, a second insulating member is arranged at the second opening of the shell body and between the second sealing plate and the electrode body, the second insulating member has a second protrusion which is opposite to the second electrode sheet, and the second protrusion is positioned to be opposite to the second recessed portion, wherein the manufacturing method of the secondary battery has the following step, namely: bringing the second protrusion of the second insulating member into contact with the second electrode sheet, thereby bending the second electrode sheet.

[0017] In the manufacturing method of a secondary battery recorded in

[16] , there is a second connecting step of connecting the second electrode sheet and the fourth electrode sheet to the second sealing plate; and an inserting step of, after the second connecting step, inserting the electrode body into the shell body from the second opening of the shell body with the first electrode sheet and the third electrode sheet as the front end while the first electrode sheet and the third electrode sheet are not connected to the first sealing plate. The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a front view showing the structure of the secondary battery according to the first embodiment of the present technology. Figure 2 It means observing from the direction of arrow II Figure 1 A diagram showing the state of a secondary battery. Figure 3 It means observing from the direction of arrow III Figure 1 A diagram showing the state of a secondary battery. Figure 4 It means observing from the direction of arrow IV Figure 1 A diagram showing the state of a secondary battery. Figure 5 It means when viewed from the direction of arrow V Figure 1 A diagram showing the state of a secondary battery. Figure 6 yes Figure 1A front cross-sectional view of a secondary battery is shown. Figure 7 It is a front view showing a negative electrode original plate before forming a negative electrode plate. Figure 8 yes Figure 7 The VIII-VIII cross-sectional view of the negative electrode original plate shown. Fig. 9 It is a front view showing a negative electrode plate formed from a negative electrode original plate. Fig.10 It is a front view showing a positive electrode original plate before forming a positive electrode plate. Fig.11 yes Fig.10 XI-XI cross-sectional view of the positive electrode original plate shown. Fig.12 It is a front view showing a positive electrode plate formed from a positive electrode original plate. Fig.13 yes Figure 1 XIII-XIII cross-sectional view of the secondary battery shown. Fig.14 yes Figure 1 A XIV-XIV cross-sectional view of the secondary battery shown. Fig.15 It is a first stereoscopic view showing the overall structure of the separator. Fig.16 It is a second stereoscopic view showing the overall structure of the separator. Fig.17 This is a flowchart showing the method for manufacturing the secondary battery according to the first embodiment. Fig.18 It is a perspective view showing a state before two electrode bodies included in the secondary battery of Embodiment 1 are overlapped. Fig.19 yes Fig.18 The electrode body and the current collector are shown in a cross-sectional view taken along the line XIX-XIX. Fig. 20 It is a perspective view showing a state where an insulating sheet and a separator are attached to an electrode body. Fig.21 It is a figure which shows the state which unfolded the insulating sheet. Fig. 22 It is a figure which shows the state which unfolded another insulating sheet. Fig.23 yes Fig. 20 The XXIII-XXIII cross-sectional view is shown. Fig.24 It is a perspective view showing a state where a holder and a separator are attached to an electrode body. Fig.25 It is a perspective view showing a state where the first sealing plate is attached to the first current collector. Fig.26 yes Fig.25 XXVI-XXVI cross-sectional view of the electrode body and the current collector shown. Fig. 27 It is a perspective view showing a state where the electrode body is inserted into the case body. Fig.28 It is a perspective view showing a state where the second sealing plate is attached to the second current collector. Fig.29 yes Fig.28 XXIX-XXIX cross-sectional view of the electrode body and the current collector shown. Fig.30 It is a perspective view showing the structure of the secondary battery according to the first embodiment. Fig.31 The secondary battery of the second embodiment Fig.25 The electrode body and the current collector shown are cross-sectional views corresponding to the cross section XXVI-XXVI. Fig.32 It is a cross-sectional view showing a state where the electrode sheet is bent. Fig.33 This is a first perspective view showing the overall structure of the spacer according to the second embodiment. Fig.34 This is a second stereoscopic view showing the overall structure of the spacer according to the second embodiment. Fig.35 It is a three-dimensional view showing the overall structure of the separator according to the third embodiment. Fig.36 is the same as implementation mode 4 Figure 1 A cross-sectional view corresponding to XIII-XIII in FIG. Fig.37 This is a first stereoscopic view showing the overall structure of the spacer according to the fourth embodiment. Fig.38 This is a second stereoscopic view showing the overall structure of the spacer according to the fourth embodiment. Fig.39 This is a first stereoscopic view showing the overall structure of the spacer according to the fifth embodiment. Fig.40 This is a second stereoscopic view showing the overall structure of the spacer according to the fifth embodiment. Fig.41 is with Fig.25 The electrode body and the current collector shown are cross-sectional views corresponding to the cross section XXVI-XXVI. Fig.42 is with Figure 1 This is a cross-sectional view corresponding to the cross section XIII-XIII of the secondary battery shown. DETAILED DESCRIPTION Hereinafter, embodiments of the present technology will be described. In addition, the same reference numerals are given to the same or corresponding parts, and description thereof may not be repeated. In addition, in the embodiments described below, when the number, amount, etc. are mentioned, the scope of the present technology is not necessarily limited to the number, amount, etc., unless otherwise specified. In addition, in the following embodiments, except for the cases where there are special records, each component is not necessarily essential to the present technology. In addition, the present technology is not necessarily limited to the technology that has all the effects mentioned in the present embodiment. In addition, in this specification, the descriptions of "comprise", "include", and "have" are open forms. That is, when a certain structure is included, other structures other than the structure may or may not be included. In addition, in this specification, when geometrical terms and terms indicating position and direction relationships are used, such as "parallel", "orthogonal", "oblique 45 degrees", "coaxial", "along", etc., these terms allow for manufacturing errors or some changes. In this specification, when terms such as "upper side" and "lower side" are used to indicate relative positional relationships, these terms are used to indicate relative positional relationships in one state, and the relative positional relationship can be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, turning the entire mechanism upside down, etc.). In this specification, "secondary battery" is not limited to lithium ion batteries, and may include other secondary batteries such as nickel-hydrogen batteries and sodium ion batteries. In this specification, positive electrodes and negative electrodes may be collectively referred to as "electrodes". In addition, in the drawings, the direction along the winding axis of the electrode body of the secondary battery is set as the X direction, the short side direction of the electrode body when viewed from the X direction is set as the Y direction, and the long side direction of the electrode body when viewed from the X direction is set as the Z direction. In addition, in order to facilitate the understanding of the invention, there are parts in which the dimensions of each structure in the drawings are changed from the actual dimensions. In the present application specification, there is the following situation, namely: the first direction (X direction) is referred to as the "width direction" of the secondary battery or the shell body, and the second direction (Y direction) is referred to as the "thickness direction" of the secondary battery or the shell body, and the third direction (Z direction) is referred to as the "height direction" of the secondary battery or the shell body. (Implementation Method 1) (Overall structure of the battery) Figure 1 It is a front view of the secondary battery 1 according to the present embodiment. Figure 2 to Figure 5 They are respectively viewed from the direction of arrow II, arrow III, arrow IV, and arrow V. Figure 1The diagram shows the state of the secondary battery 1. Figure 6 yes Figure 1 The front cross-sectional view of the secondary battery 1 is shown. Figure 6 In the cross-sectional view shown, for the sake of convenience of explanation, a spacer 600 described later is not shown. The secondary battery 1 can be mounted on an electric vehicle (BEV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), etc. However, the use of the secondary battery 1 is not limited to vehicle-mounted use. like Figure 1 to Figure 6 As shown, the secondary battery 1 includes a case 100 , an electrode body 200 , an electrode terminal 300 , and a current collector 400 . The case 100 includes a case body 110 , a first sealing plate 120 , and a second sealing plate 130 . When forming a battery pack including secondary batteries 1, a plurality of secondary batteries 1 are stacked in their thickness direction. The stacked secondary batteries 1 may be constrained in the stacking direction (Y direction) by a constraining member to form a battery module, or the battery pack may be directly supported by the side surface of the battery pack housing without using a constraining member. The case body 110 is formed of a cylindrical, preferably rectangular, member. This provides a rectangular secondary battery 1. The case body 110 is made of metal. Specifically, the case body 110 is made of aluminum, aluminum alloy, iron, or iron alloy. like Figure 1 , Figure 2 As shown in FIG. 1 , a first sealing plate 120 and a second sealing plate 130 are provided at both ends of the housing body. The housing body 110 is formed by, for example, bringing the ends of the plate-like members subjected to bending into contact with each other (at Figure 2 The square tube shape can be formed by joining the two members (for example, laser welding) to each other as shown in the joining portion 115 illustrated in FIG. 1. The corners of the “square tube shape” may also have an R shape. In the present embodiment, the shell body 110 is formed in the width direction (X direction) of the secondary battery 1 to be longer than the thickness direction (Y direction) and the height direction (Z direction) of the secondary battery 1. The dimension (width) of the shell body 110 in the X direction is preferably more than 30 cm. Thus, a relatively large (high capacity) secondary battery 1 can be formed. The dimension (height) of the shell body 110 in the Z direction is preferably less than 20 cm, more preferably less than 15 cm, and further preferably less than 10 cm. Thus, a secondary battery 1 with a relatively low height (low height) can be formed, for example, the mountability on a vehicle is improved. The shell body 110 includes a pair of first side portions 111 and a pair of second side portions 112. The pair of first side portions 111 constitute a part of the side of the shell 100. The pair of second side portions 112 constitute the bottom surface portion and the upper surface portion of the shell 100. The pair of first side portions 111 and the pair of second side portions 112 are arranged to intersect each other. The pair of first side portions 111 and the pair of second side portions 112 are connected at their respective ends. The area of ​​each of the pair of first side portions 111 is preferably larger than the area of ​​each of the pair of second side portions 112. like Figure 5 As shown, a second side surface 112A of one of the pair of second side surfaces 112 is provided with an exhaust valve 150. The exhaust valve 150 extends along the width direction (X direction) of the secondary battery 1. The exhaust valve 150 extends from the center of the housing body 110 in the X direction along the X direction to an extent that it does not reach both ends. The exhaust valve 150 can be appropriately changed. The thickness of the plate-shaped member in the exhaust valve 150 is formed thinner than the thickness of the plate-shaped member of the housing body 110 other than the exhaust valve 150. Therefore, when the pressure in the housing 100 becomes equal to or higher than a predetermined value, the exhaust valve 150 breaks preferentially compared to other parts in the housing body 110, thereby exhausting the gas in the housing 100 to the outside. like Figure 2 As shown, a joint portion 115 is formed on the other second side portion 112B of the pair of second side portions 112. The joint portion 115 extends along the width direction (X direction) of the secondary battery 1. In the joint portion 115, the end sides of the plate-like members constituting the case body 110 are joined to each other. like Figure 3 As shown, a first opening 113 is provided at the end of the first side in the first direction (X direction) of the housing body 110. The first opening 113 is sealed by a first sealing plate 120. A joint 115 is formed in the first opening 113 to seal the first opening 113. The first opening 113 and the first sealing plate 120 have a substantially rectangular shape with the Y direction as the short side direction and the Z direction as the long side direction. A negative electrode terminal 301 (first electrode terminal) is provided on the first sealing plate 120. The position of the negative electrode terminal 301 can be changed as appropriate. like Figure 4 As shown, a second opening 114 is provided at the end of the second side on the side opposite to the first side in the first direction (X direction) of the housing body 110. That is, the second opening 114 is located at the end on the side opposite to the first opening 113. The second opening 114 is sealed by the second sealing plate 130. A joint 115 is formed in the second opening 114 to seal the second opening 114. The second opening 114 and the second sealing plate 130 have a substantially rectangular shape with the Y direction as the short side direction and the Z direction as the long side direction. The second sealing plate 130 is provided with a positive electrode terminal 302 (second electrode terminal) and a liquid injection hole 134. The positions of the positive electrode terminal 302 and the liquid injection hole 134 can be changed as appropriate. The first sealing plate 120 and the second sealing plate 130 are made of metal. Specifically, the first sealing plate 120 and the second sealing plate 130 are made of aluminum, aluminum alloy, iron, iron alloy, or the like. The negative electrode terminal 301 is electrically connected to the negative electrode (first electrode) of the electrode body 200 . The negative electrode terminal 301 is attached to the first sealing plate 120 , that is, to the case 100 . The positive electrode terminal 302 is electrically connected to the positive electrode (second electrode) of the electrode body 200 . The positive electrode terminal 302 is attached to the second sealing plate 130 , that is, to the case 100 . The negative electrode terminal 301 is made of a conductive material (more specifically, a metal), for example, copper or a copper alloy, etc. A portion or layer made of aluminum or an aluminum alloy may be provided on the outer surface of the negative electrode terminal 301 . The positive electrode terminal 302 is made of a conductive material (more specifically, a metal), and can be made of, for example, aluminum or an aluminum alloy. The liquid injection hole 134 is sealed by a sealing member (not shown). As the sealing member, for example, a blind rivet or other metal member can be used. The electrode body 200 is a flat electrode body having a positive electrode plate and a negative electrode plate described later. Specifically, the electrode body 200 is a wound electrode body formed by winding a strip-shaped positive electrode plate and a strip-shaped negative electrode plate together via a strip-shaped separator not shown. However, in this specification, the "electrode body" is not limited to a wound electrode body, and may also be a stacked electrode body formed by alternately stacking a plurality of positive plates and a plurality of negative plates. The strip-shaped separator can be composed of a polyolefin microporous film, for example. The electrode body includes a plurality of positive plates and a plurality of negative plates, and the positive electrode sheets arranged on each positive plate may also be stacked to form a positive electrode sheet group, and the negative electrode sheets arranged on each negative plate may also be stacked to form a negative electrode sheet group. In addition, the electrode body 200 may include a plurality of wound electrode bodies, or may include a plurality of stacked electrode bodies. like Figure 6 As shown, the housing 100 accommodates the electrode body 200. Figure 6 In the embodiment, a first electrode body 201 described later is exemplified. The first electrode body 201 is housed in the case 100 so that its winding axis is parallel to the X direction. Specifically, a single or a plurality of wound electrode bodies and an electrolyte (electrolyte) not shown are housed together inside an insulating sheet 700 to be described later and arranged in the housing 100. As the electrolyte (non-aqueous electrolyte), for example, an electrolyte obtained by dissolving LiPF6 at a concentration of 1.2 mol / L in a non-aqueous solvent obtained by mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a volume ratio (25° C.) of 30:30:40 can be used. In addition, a solid electrolyte may be used instead of the electrolyte. The first electrode body 201 includes a main body (a portion in which a positive electrode plate and a negative electrode plate are stacked with a separator interposed therebetween), a first electrode sheet 220 (negative electrode sheet group), and a second electrode sheet 250 (positive electrode sheet group). The main body is composed of a negative electrode plate 210 and a positive electrode plate 240 described later. The first electrode sheet 220 is located at an end portion of the first electrode body 201 on the first side in the first direction (X direction) relative to the main body. The first side in this embodiment is the first sealing plate 120 side. The second electrode sheet 250 is located at an end portion of the second side of the first electrode body 201 in the first direction (X direction) relative to the main body. The second side in this embodiment is the second sealing plate 130 side. The first electrode sheet 220 and the second electrode sheet 250 are formed so as to protrude from the central portion of the electrode body 200 toward the first sealing plate 120 or the second sealing plate 130 , respectively. The current collector 400 includes a negative electrode current collector 400A and a positive electrode current collector 400B. The negative electrode current collector 400A and the positive electrode current collector 400B are each formed of a plate-like member. The electrode body 200 is electrically connected to the negative electrode terminal 301 and the positive electrode terminal 302 via the current collector 400 . The negative electrode current collector 400A is arranged on the first sealing plate 120 via an insulating member made of resin. The negative electrode current collector 400A is electrically connected to the first electrode sheet 220 and the negative electrode terminal 301. The negative electrode current collector 400A is made of a conductive material (more specifically, a metal), for example, copper or a copper alloy. In addition, the details of the negative electrode current collector 400A will be described later. The positive electrode collector 400B is arranged on the second sealing plate 130 via an insulating member made of resin. The positive electrode collector 400B is electrically connected to the second electrode sheet 250 and the positive terminal 302. The positive electrode collector 400B is composed of a conductive material (more specifically, a metal), for example, it can be composed of aluminum or an aluminum alloy. In addition, the second electrode sheet 250 can also be electrically connected to the second sealing plate 130 directly, or electrically connected to the second sealing plate 130 via the positive electrode collector 400B. In this case, the second sealing plate 130 can also play the role of the positive terminal 302. In addition, the details of the positive electrode collector 400B will be described later. (Structure of Electrode Body 200) Figure 7 2 is a front view showing a negative electrode original plate 210S before forming a negative electrode plate 210 (first electrode). Figure 8 yes Figure 7 The VIII-VIII cross-sectional view of the negative electrode original plate 210S shown in FIG. Fig. 9 1 is a front view showing a negative electrode plate 210 formed from a negative electrode original plate 210S. The negative electrode plate 210 is manufactured by processing the negative electrode original plate 210S. Figure 7 and Figure 8 As shown, the negative electrode original plate 210S includes a negative electrode core 211 and a negative electrode active material layer 212. The negative electrode core 211 is a copper foil or a copper alloy foil. The negative electrode core 211 has a negative electrode active material layer 212 formed thereon except for one end portion of both surfaces. The negative electrode active material layer 212 is formed by applying a negative electrode active material layer slurry using a die coater. The negative electrode active material layer slurry is prepared by kneading graphite as a negative electrode active material, styrene butadiene rubber (SBR) and carboxymethyl cellulose (CMC) as binders, and water as a dispersion medium so that the mass ratio of graphite:SBR:CMC is about 98:1:1. The negative electrode core 211 coated with the negative electrode active material layer slurry is dried and the water contained in the negative electrode active material layer slurry is removed to form the negative electrode active material layer 212. Furthermore, the negative electrode original plate 210S including the negative electrode core 211 and the negative electrode active material layer 212 is formed by compressing the negative electrode active material layer 212. The negative electrode original plate 210S is cut into a predetermined shape to form the negative electrode plate 210. The negative electrode original plate 210S can be cut by laser processing based on energy line irradiation, metal mold processing, or tool processing. like Fig. 9 As shown, at one end in the width direction of the negative electrode plate 210 formed by the negative electrode original plate 210S, a plurality of negative electrode sheets 230 formed by the negative electrode core 211 are provided. When the negative electrode plate 210 is wound, the plurality of negative electrode sheets 230 are stacked to form the first electrode sheet 220. Thus, the first electrode sheet 220 is connected to the negative electrode plate 210 (first electrode). The positions of the respective plurality of negative electrode sheets 230 and the lengths in the protruding direction are appropriately adjusted in consideration of the state in which the first electrode sheet 220 is connected to the negative electrode collector 400A. In addition, the shape of the negative electrode sheet 230 is not limited to Figure 8 The shape illustrated in . Fig.10 2 is a front view showing a positive electrode original plate 240S before forming a positive electrode plate 240 (second electrode). Fig.11 yes Fig.10The XI-XI cross-sectional view of the positive electrode original plate 240S shown in FIG. Fig.12 1 is a front view showing a positive electrode plate 240 formed of a positive electrode original plate 240S. The positive electrode plate 240 as the second electrode has a different polarity from the negative electrode plate 210 as the first electrode. The positive electrode plate 240 is manufactured by processing a positive electrode original plate 240S. Fig.10 and Fig.11 As shown, the positive electrode original plate 240S includes a positive electrode core 241, a positive electrode active material layer 242, and a positive electrode protective layer 243. The positive electrode core 241 is an aluminum foil or an aluminum alloy foil. The positive electrode core body 241 has a positive electrode active material layer 242 formed thereon except for one end portion of both surfaces. The positive electrode active material layer 242 is formed on the positive electrode core body 241 by applying a positive electrode active material layer slurry using a die coater. The positive electrode active material layer slurry is prepared by kneading lithium nickel cobalt manganese composite oxide as a positive electrode active material, polyvinylidene fluoride (PVdF) as a binding material, a carbon material as a conductive material, and N-methyl-2-pyrrolidone (NMP) as a dispersion medium in such a manner that the mass ratio of lithium nickel cobalt manganese composite oxide:PVdF:carbon material becomes approximately 97.5:1:1.5. The positive electrode protection layer 243 is in contact with the positive electrode core 241 and is formed at one end of the positive electrode active material layer 242 in the width direction. The positive electrode protection layer 243 is formed on the positive electrode core 241 by applying the positive electrode protection layer slurry using a die coater. The positive electrode protection layer 243 has a resistance greater than that of the positive electrode active material layer 242. The positive electrode protective layer slurry was prepared by kneading alumina powder, a carbon material as a conductive material, PVdF as a binder, and NMP as a dispersion medium so that the mass ratio of alumina powder:carbon material:PVdF was about 83:3:14. The positive electrode core 241 coated with the positive electrode active material layer slurry and the positive electrode protective layer slurry is dried and the NMP contained in the positive electrode active material layer slurry and the positive electrode protective layer slurry is removed to form the positive electrode active material layer 242 and the positive electrode protective layer 243. Furthermore, the positive electrode original plate 240S including the positive electrode core 241, the positive electrode active material layer 242 and the positive electrode protective layer 243 is formed by compressing the positive electrode active material layer 242. The positive electrode plate 240 is formed by cutting the positive electrode original plate 240S into a predetermined shape. The positive electrode original plate 240S can be cut by laser processing based on energy line irradiation, metal mold processing, or tool processing. like Fig.12As shown, at one end portion in the width direction of the positive electrode plate 240 formed by the positive electrode original plate 240S, a plurality of positive electrode sheets 260 formed by the positive electrode core 241 are provided. When the positive electrode plate 240 is wound, the plurality of positive electrode sheets 260 are stacked to form the second electrode sheet 250. Thus, the second electrode sheet 250 is connected to the positive electrode plate 240 (the second electrode). The positions of the respective plurality of positive electrode sheets 260 and the lengths in the protruding direction are appropriately adjusted in consideration of the state in which the second electrode sheet 250 is connected to the positive electrode collector 400B. In addition, the shape of the positive electrode sheet 260 is not limited to Fig.12 The shape illustrated in . The positive electrode protection layer 243 is provided at the root of each of the plurality of positive electrode sheets 260. The positive electrode protection layer 243 does not necessarily need to be provided at the root of the positive electrode sheet 260. In a typical example, the thickness of the negative electrode sheet 230 (one sheet) is smaller than the thickness of the positive electrode sheet 260 (one sheet). In this case, the thickness of the first electrode sheet 220 is smaller than the thickness of the second electrode sheet 250 . (Connection Structure of Electrode Body 200 and Current Collector 400) Fig.13 yes Figure 1 The XIII-XIII cross-sectional view of the secondary battery shown in FIG. Fig.13 As shown, the electrode body 200 includes a first electrode body 201 and a second electrode body 202. The first electrode body 201 and the second electrode body 202 include a first electrode (negative electrode) and a second electrode (positive electrode), respectively. Alternatively, the electrode body 200 may be composed of three or more electrode bodies. The electrode body 200 is formed by overlapping a first electrode body 201 and a second electrode body 202. The first electrode body 201 and the second electrode body 202 are arranged in the thickness direction (Y direction) of the first electrode body 201 and the second electrode body 202. The first electrode body 201 includes a first electrode sheet 220. A first end 205 of the first electrode sheet 220 in the X direction is electrically connected to the first electrode. The second electrode body 202 includes a third electrode sheet 270. A third end 207 of the third electrode sheet 270 in the X direction is electrically connected to the first electrode. The first electrode sheet 220 has a bent portion 221 (first bent portion) and a front end portion 222. The bent portion 221 (first bent portion) is a portion of the first electrode sheet 220 that is bent relative to the front end portion 222 on the side to which the first electrode is connected. The first electrode sheet 220 includes a recessed portion 221a (first recessed portion) that is recessed in a region opposite to a protrusion 616 (first protrusion) provided on the separator 600 described later in detail for the structure. The front end portion 222 is a portion of the first electrode sheet 220 that is located at the end portion on the side opposite to the side to which the first electrode is connected. The third electrode sheet 270 has a bent portion 271 (third bent portion) and a front end portion 272. The bent portion 271 (third bent portion) is a portion of the third electrode sheet 270 bent relative to the front end portion 272 on the side connected to the first electrode. The third electrode sheet 270 is a concave portion 271a (third concave portion) formed by a depression in a region opposite to the convex portion 626 (second convex portion) provided on the separator 600 described later in detail for the structure. The front end portion 272 is a portion of the end portion of the third electrode sheet 270 located on the side opposite to the side connected to the first electrode. The first electrode sheet 220 and the third electrode sheet 270 are bent in opposite directions so that the front ends 222 and 272 approach each other. In the present embodiment, the front ends 222 and 272 are separated, but the present invention is not limited to this structure, and the front ends 222 and 272 may be in contact with each other. The negative electrode current collector 400A electrically connects the negative electrode terminal 301 to the first electrode sheet 220 and the third electrode sheet 270. The negative electrode current collector 400A in this embodiment is connected to the negative electrode terminal 301 between the electrode body 200 and the first sealing plate 120. The negative electrode current collector 400A includes a first current collector 410 , a third current collector 430 , and a first electrode terminal-side current collector 440 . The first current collector 410 is a plate-shaped component. The first current collector 410 has a long side direction in the Z direction and a short side direction in the Y direction. The third current collector 430 is a plate-shaped component. The third current collector 430 has a long side direction in the Z direction and a short side direction in the Y direction. The first current collector 410 and the third current collector 430 are arranged side by side in the X direction. In this way, the first current collector 410 and the third current collector 430 are composed of independent components. The first electrode sheet 220 is joined to the first current collector 410 at a joining portion 411 described later. The third electrode sheet 270 is joined to the third current collector 430 at a joining portion 431 described later. The joining portions 411 and 431 can be formed, for example, by ultrasonic welding, resistance welding, laser welding, riveting, etc. In the present embodiment, the first electrode sheet 220 and the first current collector 410, and the third electrode sheet 270 and the third current collector 430 are joined, for example, by ultrasonic bonding. The first electrode terminal side current collector 440 is joined to the first current collector 410 and the third current collector 430 at a joining portion (not shown) located at an end portion in the Z direction. The first electrode terminal side current collector 440 is connected to the negative electrode terminal 301. The connection between the first electrode terminal side current collector 440 and the negative electrode terminal 301 can be formed by caulking and / or welding, for example. The negative electrode terminal 301 is provided so as to be exposed outside the first sealing plate 120 and reach the first electrode terminal-side current collector 440 of the negative electrode current collector 400A provided on the inner surface side of the first sealing plate 120 . The negative electrode terminal 301 is connected to the first plate portion 303 . The first plate portion 303 is located outside the first sealing plate 120. The first plate portion 303 is arranged along the first sealing plate 120. The first plate portion 303 has conductivity. The first plate portion 303 is arranged to ensure a connection area with a bus bar or the like that electrically connects the secondary battery 1 to another adjacent secondary battery. The connection between the negative terminal 301 and the first plate portion 303 can be formed by, for example, laser welding or the like. A first insulating member 510 is disposed between the first plate portion 303 and the first sealing plate 120 . A second insulating member 520 is disposed between the negative electrode terminal 301 and the first sealing plate 120 . A third insulating member 530 is disposed between the first electrode terminal-side current collector 440 and the first sealing plate 120 . However, the negative electrode terminal 301 may be electrically connected to the first sealing plate 120 . In addition, the first sealing plate 120 may also function as the negative electrode terminal 301 . A separator 600 (first separator) is arranged between the first sealing plate 120 and the electrode body 200. The separator 600 suppresses large movements of the electrode body 200 in the housing 100. The separator 600 is composed of an insulating resin member. The separator 600 includes a first member 610 and a second member 620. The first member 610 and the second member 620 are engaged with each other at the engaging portions (not shown) at both ends in the Z direction. The first part 610 is provided with a convex portion 616 (first convex portion) protruding toward the second part 620 side along the Y direction at the end side of the electrode body 200 side in the X direction. The second part 620 is provided with a convex portion 626 (second convex portion) protruding toward the first part 610 side along the Y direction at the end side of the electrode body 200 side in the X direction. By providing the convex portion 616 (first convex portion) and the convex portion 626 (second convex portion), the separator 600 plays a guiding role when the curved portion 221 (first curved portion) and the curved portion 271 (third curved portion) are bent, so that the curved portion 221 (first curved portion) and the curved portion 271 (third curved portion) are easily bent. In addition, the detailed structure of the separator 600 will be described later. An insulating sheet 700 made of resin is disposed between the electrode body 200 and the case body 110. More specifically, the separator 600 is covered by the insulating sheet 700 in such a manner that the insulating sheet 700 covers the electrode body 200 and also surrounds the side wall of the separator 600 on the case body 110 side. The insulating sheet 700 is connected to the separator 600 by a method described later. The insulating sheet 700 may be made of, for example, resin. More specifically, the insulating sheet 700 may be made of, for example, polypropylene (PP), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyimide (PI), or polyolefin (PO). In addition, the third insulating member 530 is located between the spacer 600 (first spacer) and the first sealing plate 120. As a result, the movement of the spacer 600 (first spacer) toward the first sealing plate 120 can be restricted. Fig.14 yes Figure 1 The XIV-XIV cross-sectional view of the secondary battery shown. Regarding the connection structure between the electrode body 200 and the collector 400 on the second electrode (positive electrode) side of the secondary battery 1 in this embodiment, the part corresponding to the first collector 410 and the third collector 430 on the first electrode (negative electrode) side is composed of a single component, which is different from the structure on the first electrode (negative electrode) side. The first electrode body 201 includes a second electrode sheet 250. A second end 206 of the second electrode sheet 250 in the X direction is electrically connected to the second electrode. The second electrode body 202 includes a fourth electrode sheet 280. A fourth end 208 of the fourth electrode sheet 280 in the X direction is electrically connected to the second electrode. The second electrode sheet 250 has a bent portion 251 (second bent portion) and a front end portion 252. The bent portion 251 (second bent portion) is a portion of the second electrode sheet 250 bent relative to the front end portion 252 on the side to which the second electrode is connected. The second electrode sheet 250 includes a recessed portion 251a (second recessed portion) formed by a depression in a region opposite to a protrusion 616 (second protrusion) provided on an isolating member 600 (second isolating member) described later in detail for the structure. The front end portion 252 is a portion of the end portion of the second electrode sheet 250 located on the side opposite to the side to which the second electrode is connected. The fourth electrode sheet 280 has a bent portion 281 (fourth bent portion) and a front end portion 282. The bent portion 281 (fourth bent portion) is a portion of the fourth electrode sheet 280 bent relative to the front end portion 282 on the side connected to the second electrode. The fourth electrode sheet 280 includes a recessed portion 281a (fourth recessed portion) formed by recessing a region opposite to a protrusion 626 (fourth protrusion) provided on the separator 600 described later in detail for the structure. The front end portion 282 is a portion of the fourth electrode sheet 280 located at the end portion on the side opposite to the side connected to the second electrode. The second electrode sheet 250 and the fourth electrode sheet 280 are bent in opposite directions so that the front ends 252 and 282 approach each other. In this embodiment, the front ends 252 and 282 are separated, but the present invention is not limited to this structure, and the front ends 252 and 282 may be in contact with each other. The positive electrode current collector 400B electrically connects the positive electrode terminal 302 to the second electrode sheet 250 and the fourth electrode sheet 280. The positive electrode current collector 400B in this embodiment is connected to the positive electrode terminal 302 between the electrode body 200 and the second sealing plate 130. The positive electrode current collector 400B includes a second current collector 420 and a second electrode terminal-side current collector 450 . The second current collector 420 is a plate-shaped member. The second current collector 420 has a long side direction in the Z direction and a short side direction in the Y direction. The second current collector 420 is formed of a single integral member. The second electrode sheet 250 and the fourth electrode sheet 280 are joined to the second current collector 420 composed of one component at a joining portion 421 described later. The joining portion 421 can be formed, for example, by ultrasonic welding, resistance welding, laser welding, riveting, etc. In the present embodiment, the second electrode sheet 250 and the fourth electrode sheet 280 are joined to the second current collector 420, for example, by ultrasonic bonding. The second electrode terminal side current collector 450 is joined to the second current collector 420 at a joining portion (not shown) located at an end portion in the Z direction. The second electrode terminal side current collector 450 is connected to the positive electrode terminal 302. The connection between the second electrode terminal side current collector 450 and the positive electrode terminal 302 can be formed by caulking and / or welding, for example. The positive electrode terminal 302 is provided so as to be exposed outside the second sealing plate 130 and reach the second electrode terminal-side current collector 450 of the positive electrode current collector 400B provided on the inner surface side of the second sealing plate 130 . The positive electrode terminal 302 is connected to the second plate portion 304 . The second plate portion 304 is located outside the second sealing plate 130. The second plate portion 304 is arranged along the second sealing plate 130. The second plate portion 304 has conductivity. The second plate portion 304 is arranged to ensure a connection area with a bus bar or the like that electrically connects the secondary battery 1 to other adjacent secondary batteries. The connection between the positive terminal 302 and the second plate portion 304 can be formed by, for example, laser welding or the like. A first insulating member 510 is disposed between the second plate portion 304 and the second sealing plate 130 . A second insulating member 520 is disposed between the positive electrode terminal 302 and the second sealing plate 130 . A third insulating member 530 is disposed between the second electrode terminal-side current collector 450 and the second sealing plate 130 . However, the positive electrode terminal 302 may be electrically connected to the second sealing plate 130 . In addition, the second sealing plate 130 may also play the role of the positive electrode terminal 302 . A separator 600 (second separator) is arranged between the second sealing plate 130 and the electrode body 200. The separator 600 (second separator) suppresses large movements of the electrode body 200 in the housing 100. The separator 600 is composed of an insulating resin member. The separator 600 includes a first member 610 and a second member 620. The first member 610 and the second member 620 are engaged with each other at the engaging portions (not shown) at both ends in the Z direction. An insulating sheet 700 (electrode body holder) made of resin is arranged between the electrode body 200 and the case body 110 . On the second electrode (positive electrode) side of the secondary battery 1, a resin insulating sheet 700 (electrode body holder) is also arranged between the electrode body 200 and the case body 110. More specifically, the separator 600 (second separator) is covered by the insulating sheet 700 in such a manner that the insulating sheet 700 covers the electrode body 200 and also surrounds the side surface of the separator 600 (second separator) on the case body 110 side. In addition, the insulating sheet 700 is connected to the separator 600 by a method described later. The third insulating member 530 is located between the spacer 600 (second spacer) and the second sealing plate 130. The spacer 600 may be in contact with the third insulating member 530. The second sealing plate 130 may be in contact with the spacer 600 (second spacer). (Isolator 600) Reference Fig.15 and Fig.16 The detailed structure of the spacer 600 will be described. Fig.15 is a first stereoscopic diagram showing the overall structure of the spacer 600. Fig.16 The second perspective view is viewed from the opposite side to the first perspective view. The first perspective view is a view viewed from the first sealing plate 120 (second sealing plate 130 ) side when the spacer 600 is disposed between the first sealing plate 120 (second sealing plate 130 ) and the electrode body 200 . The isolator 600 is made of an insulating resin member. The isolator 600 includes a first member 610 and a second member 620. When the first member 610 and the second member 620 are combined with each other, the isolator 600 has a ring-shaped shape and is divisible into two along the Y direction. In this way, since the isolator 600 is made of two members, it is configured to sandwich the electrode sheet. In addition, the isolator 600 is not limited to being made of two members, and can be made of a plurality of members as described below. Fig.35 It may be composed of one component as shown, or may be composed of two or more components. The first component 610 includes a long side wall portion 611 extending in the Z direction, and a short side wall portion 612 and a short side wall portion 614 extending from both ends of the long side wall portion 611 toward the second component 620. A plate portion 617 is provided at a corner portion of a connection portion between the long side wall portion 611 and the short side wall portion 612. A slit-shaped through hole 617s is provided in the plate portion 617. Similarly, a plate portion 618 is provided at a corner portion of a connection portion between the long side wall portion 611 and the short side wall portion 614. A slit-shaped through hole 618s is provided in the plate portion 618. A convex portion 616 is provided at the end side of the long side wall portion 611 in the X direction, protruding toward the second component 620 in the Y direction. The plate portion 617 and the plate portion 618 are located on the end face side of the electrode body. The plate portion may also abut against the end face of the electrode body. Even if it does not abut, the shortest distance is preferably within 2 mm, more preferably within 1 mm. Furthermore, by providing the through hole 618s, the electrode body is placed in a manner that the Z direction is upward. Figure 1 In the case of the secondary battery 1 shown (the direction in which the first opening 113 and the second opening 114 at both ends of the shell body 110 are arranged on the left and right), even if the electrolyte that is pressed out from the electrode body to the outside of the electrode body during charging (usually the electrode plates expand) flows out to the outside of this part, it is easy to return to the electrode body during discharge (usually the electrode plates shrink). The projection 616 constitutes a first projection in the separator 600 (first separator) disposed between the first sealing plate 120 and the electrode body 200 , and constitutes a third projection in the separator 600 (second separator) disposed between the second sealing plate 130 and the electrode body 200 . The second component 620 includes a long side wall portion 621 extending in the Z direction, and a short side wall portion 622 and a short side wall portion 624 extending from both ends of the long side wall portion 621 toward the first component 610. A plate portion 627 is provided at a corner portion of a connection portion between the long side wall portion 621 and the short side wall portion 622. A slit-shaped through hole 627s is provided in the plate portion 627. Similarly, a plate portion 628 is provided at a corner portion of a connection portion between the long side wall portion 621 and the short side wall portion 624. A slit-shaped through hole 628s is provided in the plate portion 628. A convex portion 626 is provided at the end side of the long side wall portion 621 in the X direction, protruding toward the first component 610 in the Y direction. The plate portion 627 and the plate portion 628 are located on the end face side of the electrode body. The plate portion may also abut against the end face of the electrode body. Even if it does not abut, the shortest distance is preferably within 2 mm, more preferably within 1 mm. Furthermore, by providing the through hole 628s, the electrode body is placed in a manner that the Z direction is upward. Figure 1In the case of the secondary battery 1 shown (the direction in which the first opening 113 and the second opening 114 at both ends of the shell body 110 are arranged on the left and right), even if the electrolyte that is pressed out from the electrode body to the outside of the electrode body during charging (usually the electrode plates expand) flows out to the outside of this part, it is easy to return to the electrode body during discharge (usually the electrode plates shrink). The projection 626 constitutes a second projection in the separator 600 (first separator) disposed between the first sealing plate 120 and the electrode body 200 , and constitutes a fourth projection in the separator 600 (second separator) disposed between the second sealing plate 130 and the electrode body 200 . The engaging claw 613 and the engaging groove 623 are detachably provided between the short side wall 612 and the short side wall 622. Similarly, the engaging claw 615 and the engaging groove 625 are detachably provided between the short side wall 614 and the short side wall 624. In addition, when the thickness of the separator 600 disposed on the first electrode sheet 220 and the third electrode sheet 270 in the X direction (thickness on the negative electrode side) is compared with the thickness of the separator 600 disposed on the second electrode sheet 250 and the fourth electrode sheet 280 in the X direction (thickness on the positive electrode side), the thickness on the positive electrode side can be made greater than the thickness on the negative electrode side. This is because the thickness of the foil used for the first electrode sheet 220 and the third electrode sheet 270 on the negative electrode side is thin, so the space between the electrode body and the sealing body is smaller on the negative electrode side than on the positive electrode side, thereby improving the installation efficiency of the electrode body. (Manufacturing process of secondary battery 1) Hereinafter, a method for manufacturing the secondary battery according to the present embodiment will be described. Fig.17 This is a flowchart showing the method for manufacturing the secondary battery according to the first embodiment. Fig.18 It is a perspective view showing a state before two electrode bodies included in the secondary battery of Embodiment 1 are overlapped. Fig.19 yes Fig.18 The electrode body and the current collector are shown in a cross-sectional view taken along the line XIX-XIX. like Fig.17 As shown, in the manufacturing method of the secondary battery of the present embodiment, first, the first electrode body 201 and the second electrode body 202 are made (S1 process). For each of the first electrode sheet 220, the second electrode sheet 250, the third electrode sheet 270 and the fourth electrode sheet 280, a portion of the front end is cut off so that the length of the front end becomes the same length when bundled. like Figure 17 to Figure 19As shown, after the first electrode body 201 and the second electrode body 202 are manufactured, the first electrode sheet 220 is joined to the first current collector 410 (S2 process). The first electrode sheet 220 is joined to the first current collector 410 at the joining portion 411. Next, the third electrode sheet 270 is joined to the third current collector 430 (S3 process). The third electrode sheet 270 is joined to the third current collector 430 at the joining portion 431. Next, the first electrode body 201, the second current collector 420, and the second electrode body 202 are arranged in the first direction (DR1 direction) in sequence. The second electrode sheet 250 is arranged on one side of the second current collector 420 in the first direction (DR1 direction). The second electrode sheet 250 and the fourth electrode sheet 280 are joined to the second current collector 420 with the fourth electrode sheet 280 arranged on the other side of the second current collector 420 in the first direction (DR1 direction) (S4 process). The second electrode sheet 250 and the fourth electrode sheet 280 are joined to the second current collector 420 at the joining portion 421. In the height direction of the first electrode body 201 and the second electrode body 202, the first current collector 410, the second current collector 420 and the third current collector 430 are offset and arranged to one side of the center of the first electrode body 201 and the second electrode body 202. Thus, since the current collector can be configured to be shorter, the current collector can be made compact. In addition, the first current collector 410, the second current collector 420, and the third current collector 430 are not limited to this structure. The first current collector 410, the second current collector 420, and the third current collector 430 may also be arranged at the center of the first electrode body 201 and the second electrode body 202 in the height direction of the first electrode body 201 and the second electrode body 202. In this case, in the height direction of the first electrode body 201 and the second electrode body 202, in coordination with the first current collector 410, the second current collector 420, and the third current collector 430, the first electrode sheet 220, the second electrode sheet 250, the third electrode sheet 270, and the fourth electrode sheet 280 are each arranged at the center of the first electrode body 201 and the second electrode body 202. In addition, the order of the process of joining the first current collector 410, the second current collector 420, and the third current collector 430 to the first electrode body 201 and the second electrode body 202, respectively, is not limited to the above, and the order may be changed. The process of joining the first current collector 410 and the third current collector 430 to the first electrode body 201 and the second electrode body 202, respectively, is preferably performed before the process of overlapping the first electrode body 201 and the second electrode body 202 described later, and is preferably performed before the process of joining the second current collector 420 to the first electrode body 201 and the second electrode body 202. Next, after the second electrode sheet 250 and the fourth electrode sheet 280 are bonded to the second current collector 420, the first electrode body 201 and the second electrode body 202 are bonded in the thickness direction (with respect to the thickness of the electrode sheet 250 and the fourth electrode sheet 280). Fig.16 and Fig.17 The second electrode sheet 250 and the fourth electrode sheet 280 are folded in a direction perpendicular to the DR1 direction of the electrode body 202 so that the first electrode body 201 and the second electrode body 202 overlap (step S5). That is, the first electrode body 201 and the second electrode body 202 are brought together. The so-called "overlapping the first electrode body with the second electrode body" means that the first electrode body and the second electrode body can be directly overlapped, or other components can be arranged between the first electrode body and the second electrode body. In addition, the first electrode body and the second electrode body can be fixed by tape or the like, or they can be not fixed. Furthermore, the first electrode body, the second current collector, and the second electrode body can also be arranged in a straight line in the first direction (DR1 direction), and the first electrode body or the second electrode body can be inclined relative to the first direction (DR1 direction) relative to the second current collector. By overlapping the first electrode body 201 and the second electrode body 202, the second electrode sheet 250 and the fourth electrode sheet 280 are folded to approach each other with respect to the second current collector 420. The first electrode sheet 220 and the third electrode sheet 270 are also folded so that their front ends face each other. Fig.17 and Figure 20 to Figure 24 1 is a perspective view showing a state where a retainer and a separator are installed on an electrode body. Fig.24 As shown, next, the separator 600 and the insulating sheet 700 are assembled to the electrode body 200 (step S6 ). like Fig. 20 As shown, the separator 600 is covered by the insulating sheet 700 in such a manner that the insulating sheet 700 covers the entire outer surface of the electrode body 200 and also surrounds the side surface of the separator 600 (the first separator and the second separator) on the case body 110 side. In addition, the insulating sheet 700 is connected to the separator 600 by a fixing means 710. Thus, the entire periphery of the separator 600 is covered by the insulating sheet 700, and the electrode sheet is covered by the insulating sheet 700. As a result, when the electrode body 200 covered by the insulating sheet 700 is inserted into the case body 110, the electrode sheet can be protected and unintended damage to the electrode sheet can be suppressed. Here, when the thickness direction length W1 of the separator 600 (the first separator and the second separator) and the electrode body 200 is compared with the height direction length W2 of the separator 600 and the electrode body 200, the thickness and height of the separator can be set smaller than the thickness and height of the electrode body 200. Thus, since the electrode body 200 is fixed by the insulating sheet 700, the insertability of the electrode body 200 into the housing 110 can be improved. Reference Figure 21 to Figure 23 The form of the insulating sheet 700 will be described. Fig.21 2 is a diagram showing a state where the insulating sheet 700 is unfolded. Fig. 22 FIG. 2 is a diagram showing a state where another insulating sheet 700 is unfolded. Fig.23 is Fig. 20 XXIII-XXIII cross-sectional view shown in FIG. The insulating sheet 700 has a rectangular shape in the unfolded state, and when it is wound around the outer surface of the electrode body 200 , a fold line L1 may be provided in advance at a position corresponding to a corner of the electrode body 200 . When the insulating sheet 700 is wound around the outer surface of the electrode body 200, the insulating sheet 700 may be: Figure 3 and Figure 4 The first electrode body side 200S1 opposite to the pair of first side portions 111 of the shell body 110 shown in the figure is smaller than the second electrode body side 200S2 opposite to the pair of second side portions 112 of the shell body 110, and the side end region T1 of one side of the insulating sheet 700 overlaps with the side end region T2 of the other side. Furthermore, the side end region T1 is provided with an opening 700h for fixing the side end region T1 to the side end region T2 when overlapping with the side end region T2. ​​In addition, in the figure, the opening 700h is rectangular, but it is not limited to a rectangular shape, and any shape is acceptable as long as it is a circular shape or other opening shape. Fig. 22 As shown, the opening 700h may be in a cutout shape. Reference Fig.23, using the opening 700h, the side end region T1 and the side end region T2 are fixed to the separator 600 by means of a fixing means 710 such as welding, ultrasonic bonding, tape bonding, bonding based on an adhesive, fitting, hooking, etc. As the fixing means 710, welding and ultrasonic bonding are particularly preferred. It is preferred that the fixing area for fixing the insulating sheet 700 to the separator 600 is only around the opening 700h, and a gap is provided in the overlapping area between the other side end region T1 and the side end region T2. ​​In addition, it is preferred that a gap is also provided with the separator 600. This is because when the pressure in the housing 100 becomes above a specified value, these gaps become a path for discharging the gas in the housing 100 to the outside. Therefore, in the second side portion 112B provided with the joint 115, the side end region T1 on one side and the side end region T2 on the other side of the insulating sheet 700 are fixed to the separator 600 in an overlapping manner. In addition, the insulating sheet 700 does not necessarily need to cover the entire surface of the electrode body 200. The insulating sheet 700 preferably covers an area of ​​50% or more of the outer surface of the electrode body, and more preferably covers an area of ​​70% or more. The insulating sheet 700 preferably covers the entirety of at least four of the six surfaces of the substantially rectangular parallelepiped (flat) electrode body 200, excluding the two surfaces on which the first electrode sheet 220 and the second electrode sheet 250 are formed. Fig.25 It is a perspective view showing a state where the first sealing plate is attached to the first current collector. Fig.26 yes Fig.25 XXVI-XXVI cross-sectional view of the electrode body and the current collector shown. The negative electrode terminal 301 and the first electrode terminal-side current collector 440 are attached to the first sealing plate 120 via the second insulating member 520 and the third insulating member 530. The first plate portion 303 may be connected to the negative electrode terminal 301 at any time. like Fig.17 , Fig.25 and Fig.26 As shown, after the first electrode sheet 220 is joined to the first current collector 410, the third electrode sheet 270 is joined to the third current collector 430, and the first electrode body 201 is overlapped with the second electrode body 202, the first current collector 410 and the third current collector 430 are electrically connected to the negative terminal 301 via the first electrode terminal side current collector 440 (S7 process / connection process). Since the negative terminal 301 is fixed to the first sealing plate 120 via the second insulating member 520, the first electrode sheet 220 and the third electrode sheet 270 are connected to the first sealing plate 120. In addition, the S7 step can be performed before the S6 step. By performing the S7 step before the S6 step, when the negative terminal 301 is electrically connected to the first electrode sheet 220 and the third electrode sheet 270, it is easy to connect more stably. In addition, it is easy to form a structure with a smaller space between the first sealing plate 120 and the main body of the electrode body 200. The first electrode terminal side current collector 440 attached to the first sealing plate 120 is brought into contact with the first current collector 410 and the third current collector 430 from the X direction. The first electrode terminal side current collector 440 is joined to the first current collector 410 and the third current collector 430 by laser welding between the first sealing plate 120 and the insulating sheet 700. At this time, the outer side of the lower end of the first electrode sheet 220 may be in contact with the protrusion 616 provided on the separator 600 . Similarly, the outer side of the lower end of the third electrode sheet 270 may be in contact with the protrusion 626 provided on the separator 600 . Fig. 27 2 is a perspective view showing a state where an electrode body is inserted into a shell body. Fig.17 and Fig. 27 As shown, after the first electrode body 201 and the second electrode body 202 are overlapped, the first electrode body 201 and the second electrode body 202 are inserted into the case body 110 from the first opening 113 with the second current collector 420 as the leading end (step S8 ). The first sealing plate 120 is brought close to the main body of the electrode body 200 (the first electrode body 201 and the second electrode body 202), thereby bending the first electrode sheet 220 and the third electrode sheet 270. In addition, it is preferred that the first sealing plate 120 is brought close to the main body of the electrode body 200 disposed in the shell body 110, thereby bringing the first sealing plate 120 close to the shell body 110. Fig.13 As shown, the bending state of the first electrode sheet 220 begins to bend in a manner that the first electrode sheet 220 opposite to the convex portion 616 is recessed inwardly from the convex portion 616 (first recessed portion) abutting against the lower end portion of the first electrode sheet 220, and the first electrode sheet 220 is bent to form a bent portion 221 (first bent portion). Similarly, the bending state of the third electrode sheet 270 begins to bend in a manner that the third electrode sheet 270 opposite to the convex portion 626 is recessed inwardly from the convex portion 616 (second convex portion) abutting against the lower end portion of the third electrode sheet 270, and the third electrode sheet 270 is bent to form a bent portion 271 (second bent portion). As shown Fig.13 As shown, it is preferable that the first electrode sheet 220 and the third electrode sheet 270 are bent to be substantially symmetrical. After the first sealing plate 120 is brought into contact with the housing body 110, the first sealing plate 120 is temporarily joined to the housing body 110. By temporarily joining, the first sealing plate 120 is partially joined to the first opening 113 of the housing body 110. Thus, the first sealing plate 120 is positioned relative to the housing body 110. When inserting the electrode body 200 into the case body 110, the electrode body 200 may be pulled from the second current collector 420 side, or may be pressed from the first current collector 410 and the third current collector 430 side. When the electrode body 200 is pressed from the first current collector 410 and the third current collector 430 side, the first electrode sheet 220 and the third electrode sheet 270 may be bent at the same time. Fig.28 It is a perspective view showing a state where the second sealing plate is attached to the second current collector. Fig.29 yes Fig.28 XXIX-XXIX cross-sectional view of the electrode body and the current collector shown. Fig.29 , the housing body 110 is omitted. like Fig.17 , Fig.28 and Fig.29 As shown, next, after the first electrode body 201 and the second electrode body 202 are inserted into the case body 110 , the second current collector 420 and the positive electrode terminal 302 are electrically connected (step S9 ). Specifically, the positive terminal 302 and the second electrode terminal side current collector 450 are mounted on the second sealing plate 130 via an insulating member. The second electrode terminal side current collector 450 is brought into contact with the second current collector 420 from the X direction. The second electrode terminal side current collector 450 is joined to the second current collector 420 by laser welding between the second sealing plate 130 and the insulating sheet 700. In addition, the second plate portion 304 can be connected to the positive terminal 302 at any time. like Fig.29As shown, the second electrode sheet 250 and the fourth electrode sheet 280 are each bent in such a manner that the front end portions 252 and 282 located at the ends on the side opposite to the side connected to the second electrode are close to each other so that the electrode sheets are bent in opposite directions from an extended state. As a result, the same bending shape is formed into a symmetrical state. Specifically, the second electrode sheet 250 is slowly bent from an extended state to a bent state by contacting the convex portion 616 (third convex portion) provided on the separator 600 (second separator) with the convex portion 616 as a starting point, thereby being bent and bent into a concave portion having a concave position opposite to the convex portion 616. Similarly, the fourth electrode sheet 280 is gradually bent from an extended state to a curved state by contacting the convex portion 626 (fourth convex portion) provided on the separator 600 (first separator) with the convex portion 626 as a starting point, thereby being bent to have a concave portion that is concave at a position opposite to the convex portion 626. As a result, the same bending shape is formed to be symmetrical. The second sealing plate 130 is brought close to the main body of the electrode body 200, so that the second electrode sheet 250 and the fourth electrode sheet 280 are bent. At this time, the second sealing plate 130 is brought close to the shell body 110. Fig.14 As shown, the bending state of the second electrode sheet 250 begins to bend in a manner that the second electrode sheet 250 opposite to the convex portion 616 (third convex portion) abutting the lower end of the second electrode sheet 250 is recessed inwardly, so that the second electrode sheet 250 is bent to form a curved portion 251 (first curved portion). Similarly, the bending state of the fourth electrode sheet 280 begins to bend in a manner that the convex portion 626 (fourth convex portion) abutting the lower end of the fourth electrode sheet 280 is recessed inwardly, so that the fourth electrode sheet 280 is bent to form a curved portion 281 (second curved portion). After the first sealing plate 120 is brought into contact with the housing body 110, the second sealing plate 130 is temporarily welded to the housing body 110. By temporarily joining, the second sealing plate 130 is partially joined to the second opening 114 of the housing body 110. Thus, the second sealing plate 130 is positioned relative to the housing body 110. In addition, Fig.26 and Fig.29 The distance D1 from the end face of the shell body to the predetermined portion of the sealing plate that contacts the end face of the shell body is preferably 20 mm or less, more preferably 15 mm or less, and further preferably 10 mm or less. In the state where the electrode sheet is extended, the distance D2 from the collector to the end of the electrode body (the root of the electrode sheet) is preferably 40 mm or less, more preferably 30 mm or less, and further preferably 20 mm or less. In addition, Fig.13 and Fig.14 The distance D3 from the current collector to the end of the electrode body (the root of the electrode sheet) when the sealing plate shown in the figure is in contact with the shell body is preferably 15 mm or less, more preferably 10 mm or less, and further preferably 5 mm or less. If it is such a structure, it becomes a battery with higher volume energy density. Fig.30 1 is a perspective view showing the structure of a secondary battery according to Embodiment 1. Fig.17 and Fig.30 As shown, next, the first sealing plate 120 and the second sealing plate 130 are joined to the housing body 110 (step S10). The first sealing plate 120 seals the first opening 113 of the housing body 110, and the second sealing plate 130 seals the second opening 114 of the housing body 110. Thus, the first electrode body 201 and the second electrode body 202 are accommodated in the housing 100. After the above steps, a leakage check and other inspections are performed (S11 step). After the leakage check, the secondary battery 1 is dried to remove moisture in the shell 100. Then, the electrolyte is injected into the interior of the shell 100 from the injection hole 134. When injecting the electrolyte, the second sealing plate 130 is located at the top and the first sealing plate 120 is located at the bottom, so that the shell 100 is tilted, and the electrolyte is injected into the interior of the shell 100 from the injection hole 134 of the second sealing plate 130. After that, exhaust charging is performed. During exhaust charging, the injection hole 134 can also be temporarily sealed. After that, the injection hole is sealed, and the secondary battery 1 is completed. In the manufacturing method of the secondary battery 1 and the secondary battery 1 of the first embodiment of the present technology, the first electrode body 201, the second current collector 420 composed of one component, and the second electrode body 202 are arranged in the first direction (DR1 direction) in sequence, and the second electrode sheet 250 and the fourth electrode sheet 280 formed on the first electrode body 201 and the second electrode body 202 are joined to the second current collector 420, and then the first electrode body 201 and the second electrode body 202 are overlapped with each other in the thickness direction. Thus, it is possible to form independent electrode sheets on the first electrode body 201 and the second electrode body 202, and to bend the second electrode sheet 250 and the fourth electrode sheet 280 to form the first electrode body 201 and the second electrode body 202. With this structure, the electrode sheet can be shortened compared to the case where the electrode sheet is formed together with the first electrode body 201 and the second electrode body 202 and the electrode sheet is bent. In addition, by this structure, the length of each sheet can be shortened compared to the case where the second electrode sheet 250 and the fourth electrode sheet 280 of the first electrode body 201 and the second electrode body 202 after overlapping are connected to the second collector 420 respectively. As a result, the volume occupied by the electrode sheet can be reduced, so the energy density of the secondary battery 1 can be improved. In addition, by forming independent electrode sheets on the first electrode body 201 and the second electrode body 202, and bending the electrode sheets to form the first electrode body 201 and the second electrode body 202 respectively, the electrode sheet is easy to bend compared to the case where the first electrode body 201 and the second electrode body 202 are formed together, so it is easy to join the electrode sheet with the collector, and the secondary battery can be stably manufactured. In particular, since the secondary battery 1 can be stably manufactured, the reliability of the connection between the electrode sheet and the collector can be improved. In the manufacturing method of the secondary battery 1 of embodiment 1 of the present technology, after the second electrode sheet 250 and the fourth electrode sheet 280 are joined via the second current collector 420, the first electrode body 201 and the second electrode body 202 are inserted into the shell body 110 from the side of the second current collector 420 that are joined to form a whole, so that the electrode body 200 can be easily inserted into the shell body 110. Furthermore, by providing a protrusion 616 abutting against the lower end portion of the first electrode sheet 220 and the lower end portion of the second electrode sheet 250, and a protrusion 626 abutting against the lower end portion of the third electrode sheet 270 and the lower end portion of the fourth electrode sheet 280 on the isolation member 600, the electrode sheet opposite to the protrusion begins to bend inwardly by making the protrusion abutting against the lower end portion as a starting point, thereby guiding the folding of the electrode sheet easily and in an appropriate direction. In addition, since the entire periphery of the separator 600 is covered by the insulating sheet 700, the electrode sheet is covered by the insulating sheet 700. As a result, when the electrode body 200 covered by the insulating sheet 700 is inserted into the case body 110, the electrode sheet can be protected, and undesired damage to the electrode sheet can be suppressed, thereby providing a highly reliable secondary battery. In the manufacturing method of the secondary battery 1 and the secondary battery 1 according to the first embodiment of the present technology, the electrode body 200 in which the first electrode body 201 and the second electrode body 202 are formed with independent electrode sheets and the electrode sheets are bent to form the first electrode body 201 and the second electrode body 202 can be applied to the case body 110 having the first opening 113 and the second opening 114 located at the end on the opposite side to the first opening 113. Thus, when the first opening 113 and the second opening 114 of the case body 110 are arranged in a horizontal direction, the height of the secondary battery 1 can be reduced. In the manufacturing method of the secondary battery 1 and the secondary battery 1 of embodiment 1 of the present technology, it can be constructed as follows: the first electrode sheet 220 and the third electrode sheet 270 are bent in opposite directions in such a way that the front end portions 222 and 272 of the ends located on the side opposite to the side connected to the first electrode are close to each other, so that the electrode sheets can be easily formed from the outside in the thickness direction of the electrode body. In the manufacturing method of the secondary battery 1 and the secondary battery 1 of embodiment 1 of the present technology, compared with the case where separate collectors are connected to the respective electrode sheets of the first electrode body 201 and the second electrode body 202, the electrode sheets can be connected through the second collector 420 composed of a single component, thereby reducing the connection parts of the constituent components and improving the reliability of the connection between the electrode sheets and the collectors. Secondary batteries according to Embodiments 2 to 5 are described below. The secondary batteries according to these embodiments differ from the secondary battery 1 according to Embodiment 1 in the structure of the separator, and therefore, the same structure as that of the secondary battery 1 according to Embodiment 1 of the present technique will not be described repeatedly. (Implementation Method 2) Reference Figure 31 to Figure 34 The structure of a secondary battery according to Embodiment 2 is shown. Fig.31 is with Fig.25 The electrode body and the current collector shown are cross-sectional views corresponding to the cross-section XXVI-XXVI. Fig.32 is a cross-sectional view showing a state where the electrode sheet is bent. Fig.33 is a first stereoscopic diagram showing the overall structure of the separator, Fig.34 It is a second stereoscopic view showing the overall structure of the separator. Reference Fig.31In the secondary battery of the second embodiment, the front end portions 222A and 272A of the first electrode sheet 220A and the third electrode sheet 270A are bent in the Y direction so as to face the same direction. Afterwards, the first electrode body 201A and the second electrode body 202A are inserted into the shell body so that the first sealing plate 120 is in contact with the shell body. By bringing the first sealing plate 120 close to the shell body, the first electrode sheet 220A and the third electrode sheet 270A are respectively bent into a state where the electrode sheets are bent in the same direction from an extended state. As a result, the front end portions 222A and 272A face the same direction as each other, and the same bending form becomes a state where they are bent into an arranged form. Specifically, the first electrode sheet 220A is slowly bent from an extended state to a bent state using the convex portion 616 (first convex portion) provided on the separator 600 (first separator) as a starting point, thereby being bent and bent into a concave portion having a concave position opposite to the convex portion 616. Similarly, the third electrode sheet 270A is gradually bent from the extended state to the curved state by taking the convex portion 619 (second convex portion) provided on the separator 600 (first separator) as a starting point, thereby being bent to have a concave portion that is concave at a position opposite to the convex portion 619. As a result, the same bent shape is bent into a state in which the third electrode sheet 270A is arranged. In order to make the front end portions 222A and 272A bend in the same direction easily, an intermediate side wall 650 extending along the Z direction is provided between the first electrode sheet 220A and the third electrode sheet 270A, between the long side wall portion 611 and the long side wall portion 621 of the spacer 600A. A convex portion 619 (third convex portion) protruding toward the second member 620 side in the Y direction is provided on the end side in the X direction of the intermediate side wall 650. On the other hand, no convex portion is provided on the long side wall portion 621 on the second member 620 side. When the front end portions 222A and 272A of the first electrode sheet 220A and the third electrode sheet 270A are bent in the same direction in the Y direction, the first electrode body 201A in which the first current collector 410 is joined to the first electrode sheet 220A and the second electrode body 202 in which the third current collector 430 is joined to the third electrode sheet 270A are formed into one electrode body 200A. like Fig.32 As shown, when the first electrode sheet 220A and the third electrode sheet 270A are bent, the first electrode sheet 220A has a bent portion 221 (first bent portion) and a front end portion 222. The first electrode sheet 220A includes a concave portion 221a (first concave portion) formed by a depression in a region opposite to the convex portion 616 provided on the spacer 600A. The third electrode sheet 270A has a bent portion 271 (second bent portion) and a front end portion 272. The third electrode sheet 270A includes a recessed portion 271a (third recessed portion) formed by recessing a region facing the projection 619 provided in the spacer 600A. In addition, although the illustration is omitted, Fig.14 and Fig.29 As shown, the connection structure between the electrode body and the collector on the second electrode (positive electrode) side of the secondary battery is also the same. Therefore, the second electrode sheet 250A and the fourth electrode sheet 280A are respectively bent in the same direction with the front end portions of the ends located on the side opposite to the side connected to the second electrode facing the same direction, so that the electrode sheets are bent in the same direction from an extended state. As a result, the front ends 222A and 272A are bent in the same direction to form an arranged state. Specifically, the second electrode sheet 250A is slowly bent from an extended state to a bent state with the convex portion 616 (third convex portion) provided on the separator 600 (second separator) as a starting point, thereby being bent into a concave portion having a position opposite to the convex portion 616. Similarly, the 4th electrode sheet 280A is gradually bent from the protrusion 616 (4th protrusion) provided on the isolation member 600 (1st isolation member) as a starting point so that the 4th electrode sheet 280A is changed from an extended state to a bent state, thereby being bent into a concave portion having a position opposite to the protrusion 616, and as a result, the front end portions 222A and 272A are bent into the same bent shape and arranged in a shape. (Isolator 600A) Reference Fig.33 and Fig.34 The detailed structure of the spacer 600A will be described. Note that the same reference numerals are used to denote the same parts as those of the spacer 600 in the first embodiment, and the description thereof will not be repeated. The basic structure of the spacer 600A is the same as that of the spacer 600 in the first embodiment, but an intermediate side wall 650 extending in the Z direction is provided in the first member 610 at a position between the long side wall portion 611 and the long side wall portion 621. A convex portion 651 (third convex portion) protruding toward the second member 620 side in the Y direction is provided on the end side in the X direction of the intermediate side wall 650. On the other hand, no convex portion is provided on the long side wall portion 621 on the second member 620 side. By using the spacer 600A having such a structure, the intermediate side wall 650 having the protrusion 651 (third protrusion) can be positioned between the first electrode sheet 220A and the third electrode sheet 270A. (Implementation 3) Reference Fig.35 A separator 600B of another embodiment will be described. Note that the same reference numerals are used for the same parts as those of the separator 600 in the first embodiment, and the description thereof will not be repeated. The spacer 600 described in the first embodiment is a structure that is divided into two parts including the first part 610 and the second part 620. Fig.35 The spacer 600B shown has an annular shape consisting of only one member and has an annular shape in which both sides of the short side walls 632 and 634 are connected by the long side wall portion 611 and the long side wall portion 621. This annular shape can also be adopted in the spacer 600A of the second embodiment. Even when the spacer 600B having this structure is adopted, the same operation and effects as those in the first and second embodiments can be obtained. (Implementation 4) Reference Figure 36 to Figure 38 The connection structure between the electrode assembly 200 and the current collector 400 when the separator 600C of another type is used will be described. Fig.36 is with Figure 1 A cross-sectional view corresponding to line XIII-XIII of the secondary battery shown, Fig.37 and Fig.38 These are the first and second perspective views showing the overall structure of the spacer 600C. also, Fig.36 2 shows the connection structure of the electrode body 200 and the current collector 400 on the first electrode (negative electrode) side of the secondary battery 1. The connection structure of the electrode body 200 and the current collector 400 on the second electrode (positive electrode) side of the secondary battery 1 is shown in FIG. Fig.13 and Fig.14 As shown in FIG. 1 , the electrode sheet has the same shape, so the description is omitted here. Fig.15 and Fig.16 The same parts of the separator 600 shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will not be repeated. In the spacer 600C of the present embodiment, the first member 610 and the second member 620 are arranged back-to-back in the center portion, and as a result, the convex portion 616 and the convex portion 626 are provided so as to extend from the center portion toward the outside. The first electrode sheet 220 and the third electrode sheet 270 are respectively bent in the following manner, that is, the front end portions 222 and 272 of the ends located on the side opposite to the side connected to the first electrode are positioned to face opposite directions to each other, and the electrode sheets are bent in opposite directions from the extended state. Specifically, the first electrode sheet 220 is slowly bent from the extended state to the bent state by taking the convex portion 616 (first convex portion) provided on the separator 600 (first separator) as a starting point, thereby being bent and curved into a concave portion having a concave depression at a position opposite to the convex portion 616. Similarly, the third electrode sheet 270 is slowly bent from the extended state to the bent state by taking the convex portion 626 (second convex portion) provided on the separator 600 (first separator) as a starting point, thereby being bent and curved into a concave portion having a concave depression at a position opposite to the convex portion 626. As a result, the same bending shape becomes symmetrical (with Fig.13 The bending shape shown is opposite). Even when the spacer 600C having this structure is adopted, the same operation and effects as those in the first and second embodiments can be obtained. In addition, in the above embodiments, Fig.18 and Fig.19 As shown, a structure is adopted in which the first electrode body 201, the second current collector 420 composed of one component, and the second electrode body 202 are arranged in the first direction (DR1 direction) in sequence, and after the second electrode sheet 250 and the fourth electrode sheet 280 formed by the first electrode body 201 and the second electrode body 202 are joined to the second current collector 420, the first electrode body 201 and the second electrode body 202 are overlapped with each other in the thickness direction, but it is not limited to this structure. It is also possible to adopt a structure in which the second electrode sheet 250 and the fourth electrode sheet 280 are joined to their respective current collectors respectively and the first electrode body 201 and the second electrode body 202 in an unconnected state are overlapped with each other in the thickness direction. In this case, either the negative electrode side or the positive electrode side becomes as shown in FIG. Fig.13 The structure shown. (Implementation 5) Reference Figure 39 to Figure 42 The structure of a secondary battery according to Embodiment 5 is shown. Fig.39 is a first stereoscopic diagram showing the overall structure of the separator, Fig.40 is a second stereoscopic view showing the overall structure of the separator, Fig.41 is with Fig.25 The electrode body and the current collector shown are cross-sectional views corresponding to the cross-section XXIV-XXIV. Fig.42 is with Figure 1 This is a cross-sectional view corresponding to the cross section XIII-XIII of the secondary battery shown. The difference between the fifth embodiment and the first embodiment is the shape of the spacer, the method of bending the third electrode sheet 270, and the method of bending the fourth electrode sheet 280. In addition, other structures and methods can be the same as those in the first embodiment. Hereinafter, the first electrode sheet 220 and the third electrode sheet 270 side are used as an example to explain the fifth embodiment, but the second electrode sheet 250 and the fourth electrode sheet 280 side can also be the same structure and method. like Fig.39 , Fig.40 As shown, the spacer 600D of the fifth embodiment has a long side wall portion 611 having a convex portion 616 only on the side facing the first electrode sheet 220. In the spacer 600D, the long side wall portion 611 and the convex portion 616 are not formed on the side facing the third electrode sheet 270. The size of the plate portions 617 and 618 and the number of through holes 617s and 618s are different from those of the above-mentioned spacer 600, but the functions are the same. like Fig.41 , Fig.42 As shown, the long side wall portion 611 having the protrusion 616 provided only on one side of the separator 600D is placed in a state of being arranged outside the first electrode sheet 220. By bringing the first sealing plate 120 and the electrode body 200 close to each other in this state, the first electrode sheet 220 and the third electrode sheet 270 are bent into a predetermined shape. At this time, it is preferred that the protrusion 616 abuts against the first electrode sheet 220. In addition, it is preferred that the jig (a component that does not remain in the battery case when the secondary battery is completed) abuts against the third electrode sheet 270, so that the third electrode sheet 270 is bent into a predetermined shape. According to the structure of the fifth embodiment, the separator 600D can be easily assembled to the electrode body 200 , and the first electrode sheet 220 and the third electrode sheet 270 can be bent into a suitable state. Furthermore, when most or all of the first electrode sheet 220 and the third electrode sheet 270 are located outside the first opening of the case body 110 , it is conceivable that the third electrode sheet 270 is bent by bringing the jig into contact with the third electrode sheet 270 . Although the embodiments of the present invention have been described, the embodiments disclosed this time should be considered to be illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims, and it is intended to include all changes within the meaning and scope equivalent to the claims.

Claims

1. A secondary battery, characterized in that: have: an electrode body, each of which includes a first electrode and a second electrode having a polarity different from that of the first electrode; and a shell that accommodates the electrode body, The housing comprises: a housing body having a first opening at one end thereof; and a first sealing plate for sealing the first opening, The electrode body includes a first electrode sheet and a third electrode sheet which are electrically connected to the first electrode at the end portion on the first sealing plate side, respectively. The first electrode sheet and the third electrode sheet are electrically connected to the first electrode in a bent state. The first electrode sheet has a first concave portion that is concave in a bent state. The third electrode sheet has a third recessed portion that is recessed in a bent state. A first separator is disposed at the first opening of the case body and between the first sealing plate and the electrode body. The first separator has a first protrusion facing the first electrode sheet. The first convex portion is positioned to face the first concave portion.

2. The secondary battery according to claim 1, characterized in that: The first recess is provided on the outer surface of the first electrode sheet on the side close to the housing body. The third recess is provided on the outer surface of the third electrode sheet on the side close to the housing body. The first isolating member is located between the housing body and the first electrode sheet. The first separator is not located between the case body and the third electrode sheet.

3. The secondary battery according to claim 1, characterized in that: The first electrode sheet and the third electrode sheet are electrically connected to the first electrode in a state where they are bent in opposite directions to each other.

4. The secondary battery according to claim 1, characterized in that: The first separator has a second protrusion facing the third electrode sheet. The second convex portion is positioned to face the second concave portion.

5. The secondary battery according to claim 4, characterized in that: The first recess is provided on the outer surface of the first electrode sheet on the side close to the housing body. The third recess is provided on the outer surface of the third electrode sheet on the side close to the housing body. The first separator is located between the case body and the first electrode sheet, and between the case body and the third electrode sheet.

6. The secondary battery according to claim 1, characterized in that: The first recess is provided on the outer surface of the first electrode sheet on the side close to the third electrode sheet. The third recess is provided on the outer surface of the third electrode sheet on the side close to the first electrode sheet. The first separator is arranged between the first electrode sheet and the third electrode sheet.

7. The secondary battery according to claim 1, characterized in that: The first electrode sheet has a first bent portion on the outer surface where the first recess is formed, on the first sealing plate side relative to the first recess. The third electrode sheet has a second bent portion on the first sealing plate side of the third recessed portion in the outer surface where the third recessed portion is formed.

8. The secondary battery according to claim 1, characterized in that: The electrode body and the first separator are surrounded by an insulating sheet. The insulating sheet is connected to the first separator.

9. The secondary battery according to claim 1, characterized in that: The housing includes a second sealing plate, The housing body has a second opening at an end portion on the opposite side to the first opening. The second opening is sealed by the second sealing plate, The electrode body includes a second electrode sheet and a fourth electrode sheet which are electrically connected to the second electrode at the end portion on the second sealing plate side, respectively. The second electrode sheet and the fourth electrode sheet are electrically connected to the second electrode in a bent state.

10. The secondary battery according to claim 9, characterized in that: The second electrode sheet has a second recessed portion that is recessed in a bent state. The fourth electrode sheet has a fourth recessed portion that is recessed in a bent state. A second spacer is disposed at the second opening of the case body and between the second sealing plate and the electrode body. The second separator has a second protrusion facing the second electrode sheet and a fourth protrusion facing the fourth electrode sheet. The second convex portion is positioned to face the second concave portion, The fourth convex portion is positioned to face the fourth concave portion.

11. A method for manufacturing a secondary battery, the secondary battery comprising: an electrode body, each of which includes a first electrode and a second electrode having a polarity different from that of the first electrode; and a shell that accommodates the electrode body, The housing comprises: a housing body having a first opening at one end thereof; and a first sealing plate for sealing the first opening, The first electrode body includes a first electrode sheet and a third electrode sheet which are electrically connected to the first electrode at the end portion on the first sealing plate side. The first electrode sheet and the third electrode sheet are electrically connected to the first electrode in a bent state. The first electrode sheet has a first concave portion that is concave in a bent state. The third electrode sheet has a second recessed portion that is recessed in a bent state. A first separator is disposed at the first opening of the case body and between the first sealing plate and the electrode body. The first separator has a first protrusion facing the first electrode sheet. The first convex portion is positioned to face the first concave portion, The method for manufacturing the secondary battery is characterized by comprising the following steps: a first connecting step of connecting the first electrode sheet and the third electrode sheet to the first sealing plate; and The electrode sheet bending step is to bend the first electrode sheet to form the first recessed portion and to bend the third electrode sheet to form the third recessed portion by bringing the first sealing plate and the main body of the electrode body closer together after the first connecting step.

12. The method for manufacturing a secondary battery according to claim 11, characterized in that: In the electrode sheet bending step, the first recessed portion is formed while the first protruding portion of the first separator is brought into contact with the first electrode sheet.

13. The method for manufacturing a secondary battery according to claim 11, characterized in that: The first separator has a second protrusion facing the third electrode sheet. In the electrode sheet bending step, the second recessed portion is formed while the second protruding portion of the first separator is brought into contact with the third electrode sheet.

14. The method for manufacturing a secondary battery according to claim 11, characterized in that: In the electrode sheet bending step, the second recessed portion is formed while a jig is brought into contact with the third electrode sheet.

15. The method for manufacturing a secondary battery according to claim 11, characterized in that: The process comprises the following steps: The first separator is disposed on an end surface of the electrode body on which the first electrode sheet and the third electrode sheet are provided, and the electrode body and the first separator are covered with an insulating sheet.

16. The method for manufacturing a secondary battery according to claim 11, characterized in that: The secondary battery is composed of: The housing includes a second sealing plate, The housing body has a second opening at an end portion on the opposite side to the first opening. The second opening is sealed by the second sealing plate, The electrode body includes a second electrode sheet and a fourth electrode sheet which are electrically connected to the second electrode at the end portion on the second sealing plate side, respectively. The second electrode sheet and the fourth electrode sheet are electrically connected to the second electrode in a bent state. The second electrode sheet has a second recessed portion that is recessed in a bent state. The fourth electrode sheet has a fourth recessed portion that is recessed in a bent state. A second spacer is disposed at the second opening of the case body and between the second sealing plate and the electrode body. The second separator has a second protrusion facing the second electrode sheet. The second convex portion is positioned to face the second concave portion, wherein: The manufacturing method of the secondary battery has the following steps, namely: The second protrusion of the second separator is brought into contact with the second electrode sheet to bend the second electrode sheet.

17. The method for manufacturing a secondary battery according to claim 16, characterized in that: have: a second connecting step of connecting the second electrode sheet and the fourth electrode sheet to the second sealing plate; and The insertion step is to insert the electrode body into the shell body from the second opening of the shell body with the first electrode sheet and the third electrode sheet as the leading end after the second connection step, while the first electrode sheet and the third electrode sheet are not connected to the first sealing plate.

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