Cylindrical battery

Abstract

A cylindrical battery (10) is provided with an electrode body (14) in which a long strip-shaped positive electrode (11) having a plurality of positive electrode lead portions (20) and a long strip-shaped negative electrode (12) are wound with a separator (13) interposed therebetween, a bottomed cylindrical outer packaging can (16) that houses the electrode body (14), and a sealing body (17) that is riveted and fixed to an opening portion of the outer packaging can (16). The sealing body (17) has a sealing plate (27) and a current collecting plate (40) having a through hole, and the plurality of positive electrode lead portions (20) are bent and joined to the current collecting plate (40) via the through hole of the current collecting plate (40).

Description

Technical Field

[0001] This invention relates to a cylindrical battery. Background Technology

[0002] Conventionally, a cylindrical battery as described in Patent Document 1 exists. This cylindrical battery includes a wound electrode body, a sealing body, multiple positive electrode leads extending from the positive electrode of the electrode body, a current collector electrically connected to the multiple positive electrode leads, and a metal lead electrically connecting the current collector to the sealing body. In this cylindrical battery, because multiple positive electrode leads are electrically connected to the strip-shaped positive electrode of the electrode body, the internal resistance of the battery is reduced, thereby reducing power loss.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-056091 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the aforementioned cylindrical battery, since the current collector and the sealing body are electrically connected via metal leads, the resistance of the metal leads is added to the internal resistance of the battery, thus increasing the internal resistance. Therefore, the object of the present invention is to provide a cylindrical battery with low internal resistance.

[0008] Methods for solving problems

[0009] To solve the above-mentioned problems, the cylindrical battery of the present invention comprises: an electrode body formed by winding an elongated first electrode having a plurality of lead portions and an elongated second electrode with a spacer between them; a bottomed cylindrical outer packaging can containing the electrode body; and a sealing body riveted and fixed to the opening of the outer packaging can. The sealing body has a sealing plate and a current collector plate having a through hole, and the plurality of lead portions are bent and joined to the current collector plate through the through hole of the current collector plate.

[0010] Invention Effects

[0011] The cylindrical battery according to the present invention can reduce the internal resistance of the battery. Attached Figure Description

[0012] Figure 1 This is an axial cross-sectional view of a cylindrical battery according to one embodiment of the present invention.

[0013] Figure 2 This is a three-dimensional diagram of the electrode.

[0014] Figure 3A This is a schematic top view of the positive pole.

[0015] Figure 3B This is a schematic top view of the negative electrode.

[0016] Figure 4 This is a top view of a metal plate when viewed from the thickness direction.

[0017] Figure 5 This is a schematic top view of the positive pole of the modified example.

[0018] Figure 6 This is a schematic top view of the positive pole of another variation.

[0019] Figure 7 This is an axial cross-sectional view of a modified cylindrical battery. Detailed Implementation

[0020] Hereinafter, embodiments of the cylindrical battery of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the cylindrical battery of the present invention can be a primary battery or a secondary battery. Furthermore, it can be a battery using an aqueous electrolyte or a battery using a non-aqueous electrolyte. Hereinafter, a non-aqueous electrolyte secondary battery (lithium-ion battery) using a non-aqueous electrolyte is illustrated as an example of a cylindrical battery 10; however, the cylindrical battery of the present invention is not limited to this.

[0021] In the following embodiments, variations, etc., it is conceived from the outset that new embodiments can be constructed by appropriately combining their characteristic parts. In the following embodiments, the same symbols are used for the same components in the figures, and repeated descriptions are omitted. In addition, the multiple figures include schematic diagrams, and the dimensional ratios of the components, such as the longitudinal, transverse, and height dimensions, may not be consistent between different figures. In this specification, the axial (height direction) sealing body 17 side of the battery box 15 is designated as "upper," and the axial bottom 68 side of the outer packaging can 16 is designated as "lower." Furthermore, among the constituent elements described below, those not described in the independent claims representing the superior concept are optional constituent elements and are not essential constituent elements.

[0022] Figure 1 This is an axial cross-sectional view of a cylindrical battery 10 according to one embodiment of the present invention. In this embodiment, the case where a positive electrode 11 is used as the first electrode and a negative electrode 12 is used as the second electrode will be described. Figure 1As shown, the cylindrical battery 10 includes a wound electrode body 14, a non-aqueous electrolyte (not shown), an outer packaging can 16 for housing the electrode body 14 and the non-aqueous electrolyte, and a sealing body 17. The electrode body 14 includes a positive electrode 11, a negative electrode 12, and a spacer 13 sandwiched between the positive electrode 11 and the negative electrode 12, and has a wound structure in which the positive electrode 11 and the negative electrode 12 are wound with the spacer 13 in between. The battery case 15 includes a bottom cylindrical outer packaging can 16 and a sealing body 17 for sealing the opening of the outer packaging can 16.

[0023] Non-aqueous electrolytes comprise a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. Examples of non-aqueous solvents include esters, ethers, nitriles, amides, and mixtures of two or more of these. The non-aqueous solvent may contain halogen substitutes in which at least a portion of the hydrogen atoms of these solvents are replaced by halogen atoms such as fluorine. It should be noted that non-aqueous electrolytes are not limited to liquid electrolytes; they can also be solid electrolytes using gel polymers, etc. Lithium salts such as LiPF6 are used as the electrolyte salt.

[0024] Figure 2 This is a three-dimensional view of electrode 14. (Example) Figure 2 As shown, the electrode body 14 has an elongated positive electrode 11, an elongated negative electrode 12, and two elongated spacers 13. Furthermore, three positive electrode leads 20 are electrically connected to the positive electrode 11 by bonding, and two negative electrode leads 21 are electrically connected to the negative electrode 12 by bonding. To suppress lithium deposition, the negative electrode 12 is formed to be one size larger than the positive electrode 11, and is longer than the positive electrode 11 in both the length and width directions (short side direction). Additionally, the two spacers 13 are formed to be at least one size larger than the positive electrode 11 and are arranged to sandwich the positive electrode 11.

[0025] Figure 3A This is a schematic top view of the positive electrode 11. Figure 3B This is a schematic top view of the negative electrode 12. The positive electrode 11 has a positive current collector 11a and positive electrode flux layers 11b formed on both sides of the positive current collector 11a. The positive current collector 11a can be a metal foil, such as aluminum or an aluminum alloy, that is stable within the potential range of the positive electrode 11, or a film with the metal disposed on its surface. In addition, the positive electrode flux layers 11b contain a positive electrode active material, a conductive agent, and a binder. For example, a positive electrode flux slurry containing a positive electrode active material, a conductive agent, and a binder can be coated on the positive current collector 11a, and after the coating film dries, it is compressed to form positive electrode flux layers 11b on both sides of the positive current collector 11a, thereby manufacturing the positive electrode 11.

[0026] The positive electrode active material is mainly composed of lithium-containing metal composite oxides. Examples of metal elements contained in these lithium-containing metal composite oxides include Ni, Co, Mn, Al, B, Mg, Ti, V, Cr, Fe, Cu, Zn, Ga, Sr, Zr, Nb, In, Sn, Ta, and W. A preferred example of a lithium-containing metal composite oxide is one containing at least one of Ni, Co, Mn, and Al.

[0027] Examples of conductive agents contained in the positive electrode binder layer include carbon materials such as carbon black, acetylene black, Ketjen black, and graphite. Examples of binders contained in the positive electrode binder layer include fluoropolymers such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide resins, acrylic resins, and polyolefin resins. These resins can be used in combination with cellulose derivatives such as carboxymethyl cellulose (CMC) or its salts, and polyethylene oxide (PEO).

[0028] like Figure 3A As shown, the positive electrode 11 has three positive current collector exposed portions 11c arranged at approximately equal intervals along the length direction indicated by arrow α. Each positive current collector exposed portion 11c is a given area along the length direction of the positive current collector 11a where the entire width direction (indicated by arrow β) is not coated with the positive electrode binder layer 11b. The three positive electrode lead portions 20 are joined to the three positive current collector exposed portions 11c. By joining the three positive electrode lead portions 20 at approximately equal intervals along the length direction of the strip-shaped positive current collector 11a, the current path along the length direction of the positive electrode 11 can be shortened, thus reducing the internal resistance of the cylindrical battery 10. The positive electrode lead portions 20 are covered by an insulating tape 24, resulting in the suppression of short circuits between the positive electrode 11 and the negative electrode 12. The insulating tape 24 is preferably as follows: Figure 3A The positive current collector 11c is completely covered as shown.

[0029] like Figure 3B As shown, the negative electrode 12 has a negative electrode current collector 12a and negative electrode binder layers 12b formed on both sides of the negative electrode current collector 12a. The negative electrode current collector 12a can be a metal foil, such as copper or a copper alloy, that is stable within the potential range of the negative electrode 12, or a film with the metal disposed on its surface. The negative electrode binder layer 12b contains a negative electrode active material and a binder. For example, a negative electrode binder slurry containing a negative electrode active material and a binder can be coated onto the negative electrode current collector 12a, and after the coating film dries, it is compressed to form negative electrode binder layers on both sides of the current collector, thereby fabricating the negative electrode 12.

[0030] The negative electrode active material generally uses carbon materials capable of reversibly absorbing and releasing lithium ions. Preferred carbon materials include natural graphite such as flake graphite, block graphite, and amorphous graphite, as well as artificial graphite such as block graphite and graphitized mesophase carbon microspheres. The negative electrode additive layer may contain silicon (Si) materials as the negative electrode active material. Alternatively, the negative electrode active material can be a metal other than Si alloyed with lithium, an alloy containing that metal, or a compound containing that metal.

[0031] The binder contained in the negative electrode binder layer 12b can be the same as that used in the positive electrode 11, such as fluoropolymer, PAN, polyimide resin, acrylic resin, polyolefin resin, etc., and styrene-butadiene rubber (SBR) or its modified form is preferred. The negative electrode binder layer may, for example, contain SBR, as well as CMC or its salts, polyacrylic acid (PAA) or its salts, polyvinyl alcohol, etc.

[0032] like Figure 3B As shown, the negative electrode 12 has two exposed negative electrode current collector portions 12c at the beginning and end of the winding in the length direction indicated by arrow γ. The exposed negative electrode current collector portions 12c are given areas in the length direction of the negative electrode current collector 12a where the negative electrode compound layer 12b is not coated in the entire area in the width direction indicated by arrow δ. The two negative electrode lead portions 21 are joined to the two exposed negative electrode current collector portions 12c. By joining the two negative electrode lead portions 21 to both ends of the strip-shaped negative electrode current collector 12a in the length direction, long-distance current flow along the length direction of the negative electrode 12 can be suppressed, thereby reducing the negative electrode resistance of the cylindrical battery 10. The negative electrode lead portions 21 are covered by an insulating tape 25, resulting in the suppression of short circuits between the positive electrode 11 and the negative electrode 12. The insulating tape 25 is preferably as follows: Figure 3B The diagram shows that the exposed portion 12c of the negative current collector is completely covered.

[0033] The spacer 13 is a porous sheet with ion permeability and insulation. Specific examples of porous sheets include microporous films, woven fabrics, and nonwoven fabrics. The preferred material for the spacer 13 is polyolefin resin such as polyethylene or polypropylene, or cellulose. The spacer 13 can be either a single-layer structure or a multilayer structure. A heat-resistant layer can be formed on the surface of the spacer 13. It should be noted that while the negative electrode 12 can constitute the winding start end of the electrode body 14, the spacer 13 generally extends beyond the winding start end of the negative electrode 12, and the winding start end of the spacer 13 becomes the winding start end of the electrode body 14.

[0034] like Figure 1As shown, the cylindrical battery 10 includes an insulating plate 18 disposed on the upper side of the electrode body 14. The positive electrode lead 20, mounted on the positive electrode 11, extends through a through hole in the insulating plate 18 towards the sealing body 17. The sealing body 17 includes a current collector 40 and a sealing plate 27. The current collector 40 is an annular metal plate member with a through hole 40a in its radial center. The sealing plate 27 is a metal plate member without a through hole, sealing the opening of the outer packaging can 16. Additionally, the sealing body 17 includes a metal plate 41. The metal plate 41 is a metal annular member. Figure 4 As shown, the metal plate 41 has a through hole 41a formed by a cylindrical hole.

[0035] Each positive electrode lead 20 extends from the positive electrode 11 through a through hole 40a along the upper surface 45 of the current collector plate 40. The front end of each positive electrode lead 20 is held between the upper surface 45 of the current collector plate 40 and the lower surface 47 of the metal plate 41. Each positive electrode lead 20 is bonded to the upper surface 45 of the current collector plate 40. The current collector plate 40 is also bonded to the metal plate 41, and each positive electrode lead 20 is also bonded to the metal plate 41. These bonds can be achieved, for example, by laser welding from the side of the metal plate 41 opposite to the side of the current collector plate 40 in the thickness direction while the front end of the positive electrode lead 20 is held between the current collector plate 40 and the metal plate 41. It should be noted that the current collector plate 40 may not be bonded to the metal plate 41, and the positive electrode lead 20 may not be bonded to the metal plate 41.

[0036] like Figure 1 As shown, the outer periphery of the current collector 40 abuts against the sealing plate 27. The outer periphery of the current collector 40 is preferably joined to the sealing plate 27 using laser welding or the like. The annular upper surface 45 of the current collector 40 has an annular recess 45a on the radially inner side of its outer periphery. The bottom surface 45b of the recess 45a extends in a direction substantially orthogonal to the axial direction.

[0037] Since the upper surface 45 of the current collector plate 40 has a recess 45a that is recessed to the downward side, a space is provided between the sealing plate 27 and the recess 45a of the current collector plate 40. As a result, each positive lead portion 20 is accommodated in the recess 45a.

[0038] The cylindrical battery 10 further has an annular insulating plate 19 disposed on the lower side of the electrode body 14. The first negative electrode lead portion 21a, which is engaged with the end of the negative electrode 12 at the winding start side, passes through the through hole 19a of the insulating plate 19 and bends toward the hollow portion 14a of the electrode body 14.

[0039] The second negative electrode lead portion 21b joined to the winding end-side end of the negative electrode 12 passes through the outer side of the insulating plate 19 and is bent so as to overlap the first negative electrode lead portion 21a. The overlapping portion of the first negative electrode lead portion 21a and the second negative electrode lead portion 21b is joined to the inner surface of the bottom 68 of the outer packaging can 16 by resistance welding using a welding rod inserted through the hollow portion 14a of the electrode body 14.

[0040] The outer packaging can 16 has an annular grooved portion 35 at a part in the axial direction of the cylindrical outer peripheral surface. For example, the grooved portion 35 can be formed by subjecting a part of the cylindrical outer peripheral surface to spinning working radially inward to cause it to sink radially inward. The sealing body 17 is disposed on the grooved portion 35, and is caulked and fixed to the opening of the outer packaging can 16 with the gasket 28 interposed therebetween.

[0041] The inner space of the battery case 15 is hermetically sealed by sealing between the outer packaging can 16 and the sealing body 17 with the annular gasket 28. In addition, the gasket 28 is clamped by the outer packaging can 16 and the sealing body 17, and insulates the sealing body 17 from the outer packaging can 16. That is, the gasket 28 functions as a sealing material for maintaining the airtightness inside the battery and also functions as an insulating material for insulating the outer packaging can 16 from the sealing body 17.

[0042] In the cylindrical battery 10, the sealing plate 27 electrically connected to the positive electrode lead portion 20 serves as the positive terminal, and the outer packaging can 16 electrically connected to the negative electrode lead portion 21 serves as the negative terminal. In this embodiment, an example where the sealing plate 27 constitutes a terminal cap is illustrated, but the sealing plate 27 may also be disposed between the current collecting plate 40 and the terminal cap. Although not shown in the figure, the cylindrical battery 10 may be provided with a circular or C-shaped mark (Japanese: inscription) on the bottom 68 of the outer packaging can 16 or the sealing plate 27. With the operation as described above, when the cylindrical battery 10 generates abnormal heat, the outer packaging can 16 and the sealing plate 27 can be broken starting from the mark, thereby easily discharging the high-temperature gas inside the battery to the outside and improving safety. In addition, when the sealing plate 27 is disposed between the current collecting plate 40 and the terminal cap, a vent hole may be provided in the terminal cap, so that the sealing plate 27 is endowed with a function as an explosion-proof valve.

[0043] <Action and effect of cylindrical battery 10>

[0044] According to the cylindrical battery 10, since the positive electrode 11 has a plurality of positive electrode lead portions 20 and the plurality of positive electrode lead portions 20 are directly connected to the sealing body 17 serving as the positive terminal, the internal resistance of the battery is greatly reduced.

[0045] Furthermore, since the current collector plate 40 has through holes 40a through which multiple positive lead portions 20 pass, it is easy to join each positive lead portion 20 to the current collector plate 40 even if there are deviations in the positions of the multiple positive lead portions 20. Because the through holes 40a are located radially inward on the outer periphery of the current collector plate 40, the current collector plate 40 can be crimped and fixed to the opening of the outer packaging can 16 as part of the sealing body 17. Therefore, the manufacture of the cylindrical battery 10 becomes easier.

[0046] Furthermore, when the sealing body 17 has a metal plate 41, the positive electrode lead portion 20 can be clamped by the current collector plate 40 and the metal plate 41. As a result, the positive electrode lead portion 20 can be joined (e.g., laser welding) in a stable state by pushing it towards the current collector plate 40, thereby improving the stability of the joint between the positive electrode lead portion 20 and the current collector plate 40.

[0047] Furthermore, when the metal plate 41 has a through hole 40a, the upper space 58 defined by the sealing plate 27 and the metal plate 41 can be filled with gas. Therefore, the rise in internal pressure of the cylindrical battery 10 can be suppressed. Additionally, during the manufacture of the cylindrical battery 10, since the non-aqueous electrolyte can be injected from the upper side of the metal plate 41 to the electrode body 14 side using the through hole 40a, the manufacture of the cylindrical battery 10 becomes easier. Furthermore, when the current collector plate 40 has a recess 45a, since the positive electrode lead portion 20 is housed in the recess 45a, it is easy to place the sealing plate 27 on the current collector plate 40.

[0048] <Example>

[0049] [The production of the positive electrode]

[0050] Using LiNi 0.8 Co 0.15 Al 0.05 O2 is used as the positive electrode active material. 100 parts by mass of the positive electrode active material, 1.7 parts by mass of polyvinylidene fluoride as a binder, and 2.5 parts by mass of acetylene black as a conductive agent are mixed in a dispersion medium to prepare a positive electrode paste. This positive electrode paste is applied to both sides of a positive electrode current collector made of aluminum foil, except for the bonding portion of the aluminum positive electrode lead, and then dried. The positive electrode current collector coated with the positive electrode paste is then rolled to a given thickness, thereby producing a strip-shaped positive electrode. The strip-shaped positive electrode is cut to a given size, thereby producing a positive electrode for use in a cylindrical battery. Three positive electrode leads are ultrasonically welded to the positive electrode current collector while being stretched apart along its length.

[0051] [Making the negative electrode]

[0052] Easily graphitized carbon was used as the negative electrode active material. 100 parts by weight of the negative electrode active material, 0.6 parts by weight of polyvinylidene fluoride as a binder, 1 part by weight of carboxymethyl cellulose as a thickener, and an appropriate amount of water were mixed using a double-arm mixer to obtain a negative electrode paste. This negative electrode paste was applied to both sides of a negative electrode current collector made of copper foil, except for the joint portion of the negative electrode lead, and then dried. The negative electrode current collector coated with the negative electrode paste was then rolled to a given thickness, thereby obtaining a strip-shaped negative electrode. The strip-shaped negative electrode was cut to a given size, thereby producing the negative electrode used in a cylindrical battery. The exposed portions of the negative electrode current collector at both ends along the length direction were ultrasonically welded to the negative electrode lead portions made of Ni-Cu-Ni cladding material.

[0053] [Preparation of non-aqueous electrolytes]

[0054] A non-aqueous electrolyte was prepared by dissolving lithium hexafluorophosphate (LiPF6) as an electrolyte salt in a mixed solvent of ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) to a concentration of 1.0 mol / L.

[0055] [Assembly of cylindrical batteries]

[0056] An electrode body is fabricated by spirally winding a polyolefin microporous membrane, which serves as a spacer between the positive and negative electrodes. The electrode body is then inserted into an outer packaging can through a circular insulating plate. The two negative electrode leads, which are attached to the negative electrode, are resistance-welded to the inner surface of the bottom of the outer packaging can. Next, the multiple positive electrode leads, which are attached to the positive electrode, are bent and held behind an aluminum current collector, which is then covered from above with an aluminum metal plate. The current collector and the metal plate clamp the front ends of all the positive electrode leads. Laser welding is then performed on the metal plate to join the metal plate, all the positive electrode leads, and the current collector. Then, an electrolyte, which is a non-aqueous electrolyte, is injected from above the metal plate into the electrode body side of the outer packaging can through through-holes in the metal plate and the current collector. Finally, an aluminum sealing plate is held on the current collector and laser-welded. Finally, the sealing body, including the current collector, metal plate, and sealing plate, is riveted and fixed to the outer packaging can through a gasket, thus producing a cylindrical battery. From the viewpoint of mechanical strength and heat resistance, the sealing plate can be a cladding material made of aluminum laminated with iron, nickel, or stainless steel. The sealing plate can also be made of stainless steel, which remains stable even when exposed to a positive electrode potential.

[0057] <Variation Example>

[0058] The present invention is not limited to the above-described embodiments and their variations, and various improvements and modifications can be made to the matters described in the claims of this application and their equivalents.

[0059] For example, in the above embodiment, three positive electrode leads 20 are joined to the positive electrode 11; however, any number of positive electrode leads, two or more, can also be joined to the positive electrode. Furthermore, the metal foil constituting the positive electrode current collector can be partially stretched to form each positive electrode lead. Similarly, although two negative electrode leads 21 are joined to the negative electrode 12, it is not necessary to join multiple negative electrode leads to the negative electrode 12; any number of negative electrode leads, one or more, can also be joined to the negative electrode. Furthermore, the metal foil constituting the negative electrode current collector can be partially stretched to form the negative electrode leads. The negative electrode can be electrically connected to the outer packaging can by bringing the winding end of the negative electrode current collector to the inner surface of the outer packaging can.

[0060] In addition, such as Figure 5 As shown, the positive current collector exposed portion 111c can be provided only in a portion of the width direction of a given region along the length direction of the positive current collector 111a. Furthermore, the positive lead portion 120 can be joined to the positive current collector exposed portion 111c, and the periphery of the positive current collector exposed portion 111c can be covered with insulating tape 124. By operating in this manner, the formation area of ​​the positive electrode binder layer 111b can be increased, thereby increasing the capacity.

[0061] In addition, such as Figure 6 As shown, the positive electrode binder layer 211b may be omitted from one end of the positive electrode current collector 211a in the width direction and instead, a positive electrode current collector exposed portion 211c may be provided along the entire length of that end. Furthermore, the positive electrode lead portion 220 may be joined to the positive electrode current collector exposed portion 211c, and the periphery of the positive electrode current collector exposed portion 211c may be covered along its entire length with insulating tape 224. Operating in this manner increases the flexibility in the joining position of the positive electrode lead portion 220.

[0062] Furthermore, the case where a recess 45a for accommodating a plurality of positive lead portions 20 is provided on the upper surface 45 of the current collector plate 40 has been described. However, instead of providing a recess on the upper surface of the current collector plate, a recess for accommodating a plurality of positive lead portions 20 may be provided on the lower surface of the sealing plate.

[0063] Furthermore, the metal plate 41 may not necessarily have a through hole 41a. Additionally, as... Figure 7 As shown, the cylindrical battery 310 may not have a metal plate.

[0064] Furthermore, although the case where the current collector 40 has a through hole 40a at its radial center has been described, the current collector 40 may also have through holes in portions other than the radial center. For example, the current collector may have through holes at a position that overlaps axially with the position where each positive lead portion is joined.

[0065] Furthermore, although the case where the sealing plate 27 is a terminal cap has been described, the sealing plate 27 can also be configured between the current collector 40 and the terminal cap. For example, by providing a vent hole in the terminal cap and using a metal component that breaks when the internal pressure of the battery reaches a given value as the sealing plate, an explosion-proof mechanism can be provided to the sealing body 17.

[0066] Furthermore, although the case of using the positive electrode 11 as the first electrode and the negative electrode 12 as the second electrode has been explained, the first electrode and the second electrode can be different polarities, and the negative electrode can also be used as the first electrode.

[0067] Explanation of reference numerals in the attached figures

[0068] 10, 310 Cylindrical battery; 11 Positive electrode; 11a, 111a, 211a Positive current collector; 11b, 111b, 211b Positive flux layer; 11c, 111c, 211c Exposed portion of positive current collector; 12 Negative electrode; 12a Negative current collector; 12b Negative flux layer; 12c Exposed portion of negative current collector; 13 Spacer; 14 Electrode body; 14a Hollow portion; 15 Battery case; 16 Outer packaging can; 17 Sealing body; 18 Insulating plate; 19 Insulating plate; 19a Through hole; 20, 120, 220 Positive lead portion; 21 Negative lead portion; 24, 124, 214 Insulating tape; 25 Insulating tape; 27 Sealing plate; 27a Lower surface; 28 Gasket; 35 The grooved section, 40 is the collector plate, 40a is the through hole, 41 is the metal plate, 41a is the through hole, 45 is the upper surface of the collector plate, 45a is the recess, 45b is the bottom surface of the recess, 47 is the lower surface of the metal plate, and 68 is the bottom of the outer packaging can.

Claims

1. A cylindrical battery, comprising: An electrode body formed by winding a long strip-shaped first electrode and a long strip-shaped second electrode with a spacer between them, having multiple lead portions. A bottomed cylindrical outer packaging can and a bottomed cylindrical outer packaging can containing the electrode body. A sealing body is riveted and fixed to the opening of the outer packaging can. The sealing body has a sealing plate and a current collector plate with through holes. The plurality of lead wires are bent and joined to the current collector plate through the through holes. The sealing plate is joined to the outer periphery of the current collector plate. The current collector and the sealing plate are riveted together and fixed to the opening of the outer packaging can.

2. The cylindrical battery according to claim 1, wherein, The sealing body has a metal plate disposed between the current collector and the sealing plate, and the plurality of lead portions are held by the current collector and the metal plate.

3. The cylindrical battery according to claim 2, wherein, The metal plate has through holes.

4. The cylindrical battery according to any one of claims 1 to 3, wherein, The current collector has a recess on the radially inner side of its outer periphery that accommodates the plurality of lead portions.

5. The cylindrical battery according to any one of claims 1 to 3, wherein, The sealing plate is a terminal cap.

6. The cylindrical battery according to any one of claims 1 to 3, wherein, The first electrode is the positive electrode.

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