Battery

Abstract

The invention provides a battery. A battery (10) is provided with an electrode body, an exterior body (16), a sealing body (17), and an auxiliary electrode (40). The auxiliary electrode (40) has: a first bonding part welded to the outer peripheral surface of the cylindrical part (30) of the exterior body (16); a plate-shaped first upper extending portion extending from the first joining portion toward an opening end (31) of the exterior body; and a plate-shaped external connection part (47) which extends in a different direction from the first upper extension part and is connected to the other conductive member. The cylindrical section (30) has a groove section (33) having a recessed outer peripheral surface, and the inner peripheral surface of the cylindrical section (30) protrudes. The sealing body (17) is disposed on the groove portion (33) with the gasket interposed therebetween, and the first bonding portion is bonded to the groove portion and / or a portion between the groove portion and the electrode body on the outer peripheral surface of the cylindrical portion.

Description

[0001] This application is a divisional application of the invention patent application with application date of July 29, 2020, application number 202080053647.4, and invention name “Battery”. Technical Field

[0002] The present disclosure relates to batteries. Background Art

[0003] In recent years, batteries such as lithium-ion secondary batteries have been used as power sources for electric vehicles (EVs), large-scale power storage devices, etc. When using batteries as power sources for EVs, power storage devices, etc., multiple batteries are sometimes electrically connected and used in a modular manner. For example, multiple batteries are sometimes electrically connected in series and in parallel to form a modular structure. Therefore, it is considered to collect power at one end of multiple batteries.

[0004] Patent Document 1 describes the following structure: In one of the two batteries, a connection plate is connected to the outer peripheral surface of a barrel portion as one electrode terminal through a bracket by welding, and a terminal plate is connected to a sealing body as the other electrode terminal. In the other of the two batteries, a connection plate is connected to the outer peripheral surface of the barrel portion, and the two batteries are electrically connected by connecting the connection plate to the terminal plate of one of the batteries.

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 5256821 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, in order to collect current at one end of the battery, the following situation is considered: a part of the auxiliary electrode is joined by welding to the outer peripheral surface of the barrel that becomes an electrode terminal, the auxiliary electrode is extended upwardly more than the open end of the barrel, and the part extending in a direction different from the direction of its extension is connected to another conductive member. In this case, it is hoped that the heat effect when the auxiliary electrode is joined to the barrel by welding is not easy to spread to the internal electrode body. In addition, a groove portion with a recessed outer peripheral surface is formed in the barrel so that the inner peripheral surface protrudes inward, and a gasket is arranged on the groove portion to seal the open end of the outer body by the gasket and the sealing body. It is also hoped that the heat effect during welding is not easy to spread to the open end side portion of the gasket.

[0010] An object of the present disclosure is to suppress the influence of heat during welding on the opening end side portion of the gasket and the electrode body in a battery having a structure in which an auxiliary electrode is welded to the outer peripheral surface of a cylindrical portion of an exterior body.

[0011] Means for solving problems

[0012] A battery as one mode of the present disclosure comprises: an electrode body wound with a first electrode and a second electrode through a separator; an outer body having a cylindrical barrel, an open end formed at one end of the barrel and a bottom sealing the other end of the barrel, accommodating the electrode body and electrically connected to the first electrode; a sealing body sealing the open end of the outer body together with a gasket and electrically connected to the second electrode; and an auxiliary electrode having a first joint welded to the outer peripheral surface of the barrel, a plate-shaped first upper extension extending from the first joint to the open end side, and a plate-shaped external connection extending from the first upper extension to a different direction and connected to another conductive member, the barrel having a groove portion recessed on the outer peripheral surface so that the inner peripheral surface of the barrel protrudes, the sealing body is arranged on the groove portion through the gasket, and the first joint portion is joined to at least one of the groove portion and the portion between the groove portion and the electrode body in the outer peripheral surface of the barrel. In addition, in the present disclosure, "upper" refers to the open end side of the barrel of the battery, and "lower" refers to the bottom side.

[0013] Effects of the Invention

[0014] According to the battery of the present disclosure, in a structure in which the auxiliary electrode is welded to the outer peripheral surface of the cylindrical portion of the outer casing, it is possible to suppress the influence of heat during welding from affecting the opening end side portion of the gasket and the electrode body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a perspective view showing an extracted upper portion of a battery in one example (first example) of the embodiment.

[0016] Figure 2 yes Figure 1 Front view of the battery.

[0017] Figure 3 The thickness of the battery components is exaggerated. Figure 2 AA section diagram.

[0018] Figure 4A yes Figure 1 A three-dimensional diagram of the auxiliary electrode of a battery.

[0019] Figure 4B is from Figure 4A Dorsal observation Figure 4A A three-dimensional diagram of the auxiliary electrode.

[0020] Figure 5 This is a perspective view showing a state in which the outer casing of the battery is placed on a jig and the auxiliary electrode is joined to the outer peripheral surface of the outer casing by welding.

[0021] Figure 6This is a perspective view of the upper portion of a battery in another example (second example) of the embodiment.

[0022] Fig. 7A is from Figure 6 A three-dimensional diagram showing the auxiliary electrode taken out.

[0023] Figure 7B It is configured with multiple Fig. 7A Diagram of the battery configuration structure.

[0024] Figure 8 This is a perspective view of the upper portion of a battery in another example (third example) of the embodiment.

[0025] Fig. 9 is from Figure 8 A three-dimensional diagram showing the auxiliary electrode taken out.

[0026] Fig.10 is from Fig. 9 Dorsal observation Fig. 9 A three-dimensional diagram of the auxiliary electrode.

[0027] Fig.11 yes Fig. 9 B view.

[0028] Fig.12 yes Fig.11 CC cross-sectional view.

[0029] Fig.13 yes Fig. 9 Expanded diagram of the auxiliary electrode.

[0030] Fig.14 yes Figure 8 Front view of the battery.

[0031] Fig.15 The thickness of the battery components is exaggerated. Fig.14 Figure 2 shows a cross section of DD.

[0032] Fig.16 This is a perspective view of the upper portion of a battery in another example (fourth example) of the embodiment.

[0033] Fig.17 is from Fig.16 A three-dimensional diagram showing the auxiliary electrode taken out.

[0034] Fig.18 is from Fig.17 Dorsal observation Fig.17 A three-dimensional diagram of the auxiliary electrode.

[0035] Fig.19 yes Fig.17 Expanded diagram of the auxiliary electrode.

[0036] Fig. 20 This is a perspective view of the upper portion of a battery in another example (fifth example) of the embodiment.

[0037] Fig.21 yes Fig. 20 Side view of a battery.

[0038] Fig. 22 is from Fig.21 A three-dimensional diagram showing the auxiliary electrode taken out.

[0039] Fig.23 is from Fig. 22 Dorsal observation Fig. 22 A three-dimensional diagram of the auxiliary electrode.

[0040] Fig.24 This is a perspective view of an auxiliary electrode taken out from a battery in another example (sixth example) of the embodiment. DETAILED DESCRIPTION

[0041] Below, one example of an implementation is described in detail. The drawings referred to in the description of the implementation are schematically recorded, and the specific dimensions of each component should be determined with reference to the following description. In this specification, regarding the term "approximately to", if it is described as being approximately the same, its intention is of course to include being completely identical, and also includes situations that are considered to be substantially the same. The shapes, materials, numbers, and numerical values ​​described below are examples for explanation and can be appropriately changed according to the use of the battery. In all the following drawings, equivalent elements are marked with the same symbols for description.

[0042] [First example of implementation]

[0043] Figure 1 It is a perspective view of the upper portion of a battery 10 in one example (first example) of the embodiment. Figure 2 It is a front view of the battery 10. Figure 3 The thickness of the components of the battery 10 is exaggerated. Figure 2 AA section diagram.

[0044] like Figure 1 to Figure 3 As shown in FIG. 1 , the battery 10 includes an outer casing 16, a sealing body 17, and an auxiliary electrode 40. The battery 10 is, for example, a non-aqueous electrolyte secondary battery. Figure 3 As shown, the outer casing 16 contains an electrode body 14 and a non-aqueous electrolyte (not shown). The electrode body 14 includes a positive electrode 11, a negative electrode 12, and a separator 13. The positive electrode 11 and the negative electrode 12 are wound in a spiral shape with the separator 13 interposed therebetween. In the battery 10, the positive electrode 11 corresponds to the second electrode, and the negative electrode 12 corresponds to the first electrode. Figure 3In order to make the arrangement relationship of the positive electrode 11, the negative electrode 12, and the separator 13 in the electrode body 14 easier to understand, the positive electrode, the negative electrode, and the separator are exaggerated by being drawn larger. Therefore, the battery disclosed in the present invention is not limited to Figure 3 The positive electrode 11, the negative electrode 12, and the separator 13 constituting the electrode body 14 are all formed in a strip shape and are wound so as to be alternately stacked in the radial direction of the electrode body 14.

[0045] The non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. The non-aqueous electrolyte is not limited to a liquid electrolyte, and may also be a gel or solid. Hereinafter, the opening side of the outer casing 16 of the battery 10 is set as "upper" and the bottom side is set as "lower" for description.

[0046] like Figure 3 As shown, the positive electrode lead 19 electrically connecting the positive electrode 11 and the sealing body 17 (positive electrode terminal) is provided, for example, at the approximate center of the winding inner end and the winding outer end of the electrode body 14, and extends from the upper end of the electrode body 14. The negative electrode leads 20a and 20b electrically connecting the negative electrode 12 and the outer body 16 (negative electrode terminal) are provided, for example, at the winding inner end of the electrode body 14 and the winding outer end of the electrode body 14, respectively, and extend from the lower end of the electrode body 14. In addition, a plurality of positive electrode leads 19 may be provided, and only one negative electrode lead 20a and 20b may be provided, or three or more negative electrode leads 20a and 20b may be provided.

[0047] The outer casing 16 includes a cylindrical tube 30, an open end 31 formed at one end, i.e., the upper end, of the tube 30, and a bottom 32 ( Figure 3 ). The outer casing 16 contains the electrode body 14 and the nonaqueous electrolyte, and is electrically connected to the negative electrode 12. Therefore, in the negative electrode 12, the negative electrode leads 20a and 20b extend to the bottom 32 side of the outer casing 16, and are connected to the bottom inner surface of the outer casing 16 by welding. In the battery 10, the outer casing 16 serves as a negative electrode terminal. The outer casing 16 is formed by stretching a metal such as steel, iron, aluminum, copper, or nickel.

[0048] The sealing body 17 seals the open end 31 of the outer body 16 together with the gasket 27 described later, and is electrically connected to the positive electrode 11. The sealing body 17 and the outer body 16 together constitute the battery case. Insulating plates 18a and 18b are respectively provided above and below the electrode body 14. The positive electrode lead 19 is connected to the positive electrode 11 and extends outward in the winding axis direction of the electrode body 14. In addition, the positive electrode lead 19 passes through the through hole of the insulating plate 18a and extends to the sealing body 17 side, and is welded to the lower surface of the filter 22 serving as the bottom plate of the sealing body 17. In the battery 10, the cover body 26 serving as the top plate of the sealing body 17 electrically connected to the filter 22 becomes the positive terminal.

[0049] The gasket 27 is arranged between the outer body 16 and the sealing body 17 to ensure the airtightness in the battery case 15 and to electrically insulate the outer body 16 and the sealing body 17. The barrel 30 of the outer body 16 has a groove portion 33 with a recessed outer circumferential surface so that the inner circumferential surface of the barrel 30 protrudes inward. For example, the barrel 30 is pressed from the outside to form the groove portion 33. The sealing body 17 is arranged to be supported on the groove portion 33 with the gasket 27 interposed therebetween. The groove portion 33 is formed in an annular shape along the circumferential direction of the barrel 30. The upper end portion 37 of the opening end 31 of the outer body 16 is bent radially inward so that the gasket 27 is pressed from above.

[0050] The sealing body 17 is stacked with a filter 22, a lower valve body 23, an insulating member 24, an upper valve body 25 and a cover body 26 in order from the electrode body 14 side. The components constituting the sealing body 17 have, for example, a disc shape or a ring shape, and the components except the insulating member 24 are electrically connected to each other. The lower valve body 23 and the upper valve body 25 are connected to each other at their respective central portions, and an insulating member 24 is provided between their respective peripheral portions. A vent hole is provided in the lower valve body 23, so that if the internal pressure of the battery rises due to some factor, the upper valve body 25 expands toward the cover body 26 side and moves away from the lower valve body 23, thereby cutting off the electrical connection between the two. If the internal pressure rises further, the upper valve body 25 ruptures and the gas is discharged from the opening of the cover body 26.

[0051] The structures of the positive electrode 11, the negative electrode 12, and the separator 13 are described in detail. The positive electrode 11 has a strip-shaped positive electrode core and a positive electrode mixture layer. The positive electrode mixture layer contains a positive electrode active material and a binder, and is formed on the positive electrode core. An example of a preferred positive electrode core is a foil of a metal with aluminum or an aluminum alloy as a main component. The thickness of the positive electrode core is, for example, 5μm to 30μm. The positive electrode lead 19 is connected to the side of the portion of the upper end of the positive electrode 11 where the surface of the positive electrode core is exposed.

[0052] The positive electrode mixture layer is preferably formed on both sides of the positive electrode core in the thickness direction. The positive electrode mixture layer includes, for example, a positive electrode active material, a binder, and a conductive agent. A positive electrode mixture slurry containing a positive electrode active material, a binder, a conductive agent, and a solvent such as N-methyl-2-pyrrolidone (NMP) is applied to both sides of the positive electrode core, and the coating film is compressed, thereby making the positive electrode 11.

[0053] The positive electrode 11 can be embedded with lithium ions. Therefore, as the positive electrode active material, a lithium-containing transition metal oxide containing transition metal elements such as Co, Mn, and Ni can be exemplified. The lithium-containing transition metal oxide is not particularly limited, and is preferably a general formula Li 1+xA composite oxide represented by MO2 (wherein -0.2<x≤0.2, M includes at least one of Ni, Co, Mn, and Al). As the conductive material, carbon materials such as carbon black, acetylene black, Ketjen black, and graphite can be exemplified. These can be used alone or in combination of two or more.

[0054] Examples of the binder include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide, acrylic resin, polyolefin, etc. In addition, these resins may be used in combination with carboxymethyl cellulose (CMC) or its salt, polyethylene oxide (PEO), etc. These may be used alone or in combination of two or more.

[0055] The negative electrode 12 includes a strip-shaped negative electrode core and a negative electrode mixture layer. The negative electrode mixture layer contains a negative electrode active material and a binder and is formed on the negative electrode core. An example of a preferred negative electrode core is made of a metal foil mainly composed of copper or a copper alloy. The thickness of the negative electrode core is, for example, 5 μm to 30 μm.

[0056] The negative electrode mixture layer is preferably formed on both sides of the negative electrode core in the thickness direction. The negative electrode 12 can be manufactured by applying a negative electrode mixture slurry containing a negative electrode active material, a binder and water on both sides of the negative electrode core and compressing the coating.

[0057] The negative electrode active material is not particularly limited as long as it can reversibly absorb and release lithium ions. For example, carbon materials such as natural graphite and artificial graphite, metals such as silicon (Si) and tin (Sn) that alloy with lithium, or oxides containing metal elements such as Si and Sn can be used as the negative electrode active material.

[0058] Preferred examples of negative electrode active materials include graphite, SiO x As the negative electrode active material, the negative electrode mixture layer may contain graphite or SiO x When graphite and the silicon oxide are used together, the mass ratio of graphite to the silicon oxide is, for example, 99:1 to 80:20, and preferably 97:3 to 90:10.

[0059] SiO x The silicon oxide shown in FIG. 1 has a structure in which Si particles are dispersed in an amorphous SiO2 matrix. x The silicon oxide represented by may also contain Li 2y SiO （2+y） The lithium silicate represented by (0<y<2) may have a structure in which Si fine particles are dispersed in the lithium silicate phase.

[0060] Preferably, SiO x The surface of the silicon oxide particles represented by the present invention is formed with a conductive coating made of a material having a higher conductivity than silicon oxide. The material constituting the conductive coating is preferably at least one selected from carbon materials, metals and metal compounds. Among them, carbon materials are particularly preferred. For example, the carbon coating is relatively x The mass of the particles is formed at 0.5 to 10 mass %.

[0061] As the binder contained in the negative electrode mixture layer, fluororesin, PAN, polyimide, acrylic resin, polyolefin, etc. can be used as in the case of the positive electrode. In the case of using an aqueous solvent to prepare the mixture slurry, CMC or its salt, styrene-butadiene rubber (SBR), polyacrylic acid (PAA) or its salt, etc. are preferably used. They can be used alone or in combination of two or more.

[0062] The spacer 13 is in the winding axis direction ( Figure 2 , Figure 3 The separator 13 is in the shape of a strip larger than the negative electrode 12 in the vertical direction. A porous sheet having ion permeability and insulation is used as the separator 13. Specific examples of the porous sheet include microporous films, woven fabrics, non-woven fabrics, etc. As the material of the separator 13, olefin resins such as polyethylene and polypropylene, cellulose, etc. are preferred. The separator 13 can also be a laminate having a cellulose fiber layer and a thermoplastic resin fiber layer such as an olefin resin.

[0063] Next, the auxiliary electrode 40 is described. A plurality of batteries 10 are arranged, and a battery module is formed by connecting the plurality of batteries 10 in electrical series or in parallel or in a combination thereof. At this time, the plurality of batteries 10 are current collected at the upper portion. In addition, the width in the radial direction of the upper end portion 37 of the barrel 30 of the outer casing 16 is small, and a curved portion with a circular arc cross-section is formed, whereby the upper end surface of the upper end portion 37 is often uneven or has a small flat portion. Therefore, in the case where the upper end of the barrel 30 is joined to another conductive component by welding, it is difficult to butt the two components with a wide area before joining. Therefore, it is desired to improve the shape accuracy of the structure after connecting another conductive component to the battery.

[0064] In the embodiment, in order to eliminate such an undesirable situation, the auxiliary electrode 40 is joined to the outer side of the middle part in the vertical direction of the cylinder 30, and the upper extension part 45 of the auxiliary electrode 40 is extended to the upper side of the upper end part 37 of the cylinder 30, and the external connection part 47 extending from the upper end of the upper extension part 45 to the direction different from the upper extension part 45 is formed. Another conductive member 100 ( Figure 3). As a result, most of the upper end surface of the external connection portion 47 can be flattened, so that the shape accuracy of the structure after the other conductive member 100 and the battery 10 are connected can be improved.

[0065] Furthermore, in the embodiment, as described later, the position where the auxiliary electrode 40 and the tube 30 are joined by welding is restricted, thereby suppressing the influence of heat during welding from affecting the portion of the spacer 27 on the opening end 31 side and the electrode body 14 .

[0066] Figure 4A is from Figure 1 A perspective view showing the auxiliary electrode 40 taken out. Figure 4B is from Figure 4A A three-dimensional view of the auxiliary electrode 40 observed from the back side of the tube 30. The auxiliary electrode 40 is formed by pressing a highly conductive metal plate such as copper, aluminum, iron, steel, nickel, etc. and bending it to form a roughly L-shaped cross section. The auxiliary electrode 40 includes a joint portion 41 provided in the lower half and welded to the outer peripheral surface of the cylinder 30, a plate-shaped upper extension portion 45 provided in the upper half and extending from the upper end of the joint portion 41 to the upper side of the cylinder 30 as the opening end 31 side, and a plate-shaped external connection portion 47 bent from the upper end of the upper extension portion 45 to a substantially right angle relative to the upper extension portion 45 and extending in a direction different from the upper extension portion 45. The joint portion 41 is equivalent to the first joint portion, and the upper extension portion 45 is equivalent to the first upper extension portion.

[0067] The joint portion 41 has a lower extension portion 49, which is continuous from the lower end of the upper extension portion 45 as the electrode body 14 side end, and extends to a portion exceeding the lower end of the groove portion 33. In the portion of the lower extension portion 49 opposite to the groove portion 33, a first notch 50 is formed in a substantially U-shaped shape as the lower side opening on the electrode body 14 side. In the lower extension portion 49, a first bent portion 51 is formed on the inner side of the first notch 50, which is bent from the lower extension portion 49 toward the barrel portion 30. Regarding the first bent portion 51, the front end portion of the first bent portion 51 may be cut off to further reduce the length of the first notch 50 in the vertical direction.

[0068] The joint 41 is Figure 3 The joining portion 41 is joined to the cylindrical portion 30 of the outer casing 16 within the range indicated by the arrow α. Specifically, the joining portion 41 is welded to the groove portion 33 and the outer peripheral surface of the cylindrical portion 30 in the winding axis direction of the electrode body 14 ( Figure 2 , Figure 3 The joining portion 41 is preferably welded to the valley point G ( Figure 3) and at least one of the groove portion 33 of the outer peripheral surface of the barrel portion 30 and the electrode body 14 in the winding axis direction of the electrode body 14. Welding is laser welding, resistance welding, ultrasonic welding, etc. Specifically, the first bent portion 51 of the joint 41 is joined to a position below the valley point G of the depression on the outer side surface of the groove portion 33 of the barrel portion 30.

[0069] The external connection portion 47 extends so as to face the upper end portion 37 of the outer casing 16. Another conductive member 100 ( Figure 3 ), thereby electrically connecting the external connection portion 47 to the conductive member 100.

[0070] Figure 5 It is a three-dimensional diagram showing a state in which the auxiliary electrode 40 is joined to the outer peripheral surface of the outer body 16 by ultrasonic welding. When the auxiliary electrode 40 is joined to the outer body 16, the outer body 16 is held by a holding member 101 (anvil). The holding member 101 has a box portion 103, and the box portion 103 is formed on the upper side of a main body portion 102 whose upper surface is a horizontal plane so as to be inclined relative to the upper surface of the main body portion 102, and a holding hole 104 is formed on the upper side. One half of the outer body 16 in the radial direction is embedded in the holding hole 104, and the other half of the outer body 16 in the radial direction protrudes further to the upper side than the opening of the box portion 103. In this state, the auxiliary electrode 40 is arranged at a given position at the upper end portion of the outer body 16, and in this state, the first bent portion 51 ( Figure 3 ) is configured as the lower open end portion in a part of the circumferential direction of the groove portion 33 of the outer casing 16. Then, the horn 105 of ultrasonic welding is pushed from the upper side of the first bent portion 51 of the auxiliary electrode 40 and welded to the lower open end portion of the groove portion 33. Even in the case where the first bent portion 51 does not follow the shape of the open end portion of the groove portion 33 before welding, the first bent portion 51 is welded in surface contact along the shape of the groove portion 33 by welding. In addition, the joint portion of the auxiliary electrode 40 can also be joined to only one of the groove portion 33 of the outer casing 16 and the portion of the barrel 30 that extends from the lower end of the groove portion 33 to the bottom and the inner side of which is not opposite to the electrode body by welding.

[0071] According to the above-described battery 10, the joint portion 41 of the auxiliary electrode 40 is joined to at least one of the groove portion 33 of the barrel portion 30 and the portion of the outer peripheral surface of the barrel portion 30 between the groove portion 33 and the electrode body 14 in the winding axis direction of the electrode body 14. Thus, the influence of heat during welding of the auxiliary electrode 40 can be suppressed from affecting the portion on the side of the opening end 31 of the gasket 27 and the electrode body 14.

[0072] Furthermore, the joint portion 41 of the auxiliary electrode 40 is joined by welding to at least one of a position below the valley point G of the depression on the outer side surface of the groove portion 33 and a portion of the cylinder portion 30 extending from the lower end of the groove portion 33 to the bottom 32 and not facing the electrode body 14 on the inner side. Thus, the influence of heat during welding of the auxiliary electrode 40 can be suppressed from affecting the gasket 27 supporting the sealing body 17 together with the groove portion 33 and the electrode body 14.

[0073] In addition, the welding portion of the auxiliary electrode 40 to the barrel 30 is formed by the first bent portion 51, and the first bent portion 51 is bent toward the groove 33 side of the outer body 16, that is, one side of the thickness direction of the lower extension 49, at the portion of the lower extension 49 surrounded by the first notch 50. As a result, the welding portion can be easily brought close to or abutted against the barrel 30 in a manner such that the first bent portion 51 is along the shape of the barrel 30, such as the curved surface of the cross-section of the opening end of the groove 33 or the outer surface of the groove 33, thereby easily increasing the area of ​​the welding portion and the barrel 30 surface contact to improve the bonding strength. As a result, the reliability of the electrical connection between the auxiliary electrode 40 and the barrel 30 can be improved. In addition, in the battery disclosed in the present invention, the first notch may not be U-shaped. For example, in the lower extension portion, it may also be a roughly L-shaped shape consisting of a first straight line extending horizontally from an edge extending in the vertical direction of the battery and a second straight line extending downward from the front end of the first straight line. In addition, in the battery disclosed in the present invention, a plurality of first notches may be formed for one lower extension portion. In addition, since the first bent portion is formed from the U-shaped first notch, compared with the first notch extending from the edge of the lower extension portion, the portions extending in the upper and lower directions in the lower extension portion are arranged on both sides of the horizontal direction of the first bent portion, and thus the mechanical stress of the pair of portions on the welded portion can be further reduced.

[0074] [Second example of implementation]

[0075] Figure 6 It is a perspective view of the upper portion of a battery 10 a in another example (second example) of the embodiment. Fig. 7A is from Figure 6 A perspective view showing the auxiliary electrode 40a. In this example, the auxiliary electrode 40a having the following structure is used: Figure 1 to Figure 4B The auxiliary electrodes 40 shown in the figure are arranged in two separated parts along the circumferential direction of the battery 10a, and the upper ends thereof are connected. Specifically, the auxiliary electrode 40a has one end portion ( Fig. 7A The first joining portion 55 and the first upward extending portion 57 are arranged at the left end portion of the outer casing 16, and the other end portion ( Fig. 7AThe first joint portion 55 is provided at the lower half of one end of the auxiliary electrode 40a and is welded to the outer peripheral surface of the barrel 30. The first upper extension portion 57 is provided at the upper half of one end of the auxiliary electrode 40a and is in the shape of a plate extending from the upper end of the first joint portion 55 to the upper side of the opening end 31 of the barrel 30. The first joint portion 55 and the first upper extension portion 57 have the same Figure 1 to Figure 4B The first joint portion 55 has the same shape as the joint portion 41 and the upper extension portion 45 of the auxiliary electrode 40 shown. Therefore, the first joint portion 55 has a first lower extension portion 58, a first notch 59 formed in the first lower extension portion 58, and a first bent portion 60, the first bent portion 60 is formed inside the first notch 59 in the first lower extension portion 58, and is bent from the first lower extension portion 58 toward the barrel portion 30, and the first bent portion 60 is engaged with the groove portion 33.

[0076] The second joint portion 62 is welded separately from the first joint portion 55 in the circumferential direction of the cylindrical portion 30 of the outer casing 16. The second joint portion 62 is provided in the lower half of the other end of the auxiliary electrode 40a and is welded to the outer peripheral surface of the cylindrical portion 30. The second upper extension portion 64 is provided in the upper half of the other end of the auxiliary electrode 40a and is in the shape of a plate extending from the upper end of the second joint portion 62 to the upper side of the opening end 31 of the cylindrical portion 30. The second joint portion 62 and the second upper extension portion 64 have the same shapes as the first joint portion 55 and the first upper extension portion 57, respectively.

[0077] Specifically, the second bonding portion 62 includes a second downward extending portion 65 extending from the second upward extending portion 64 as the electrode body 14 ( Figure 3 ) is continuous with the lower end of the side end and extends to a portion exceeding the lower end of the groove portion 33. In the portion of the second lower extension portion 65 that is opposite to the groove portion 33, a second notch 66 is formed in a substantially U-shape as a lower opening on the electrode body side. In the second lower extension portion 65, a second bent portion 67 is formed on the inner side of the second notch 66, which is bent from the second lower extension portion 65 toward the barrel portion 30. Regarding the second bent portion 67, the front end portion of the second bent portion 67 may be cut off to further reduce the length of the second notch 66 in the vertical direction.

[0078] The second joint portion 62 is similar to the first joint portion 55 and is welded to the groove portion 33 and the electrode body 14 (see Figure 3) is joined to at least one of the groove portion 33 on the outer peripheral surface of the barrel 30 in the direction of the winding axis of the barrel 30 and the portion between the electrode body 14. Preferably, the second joining portion 62 is joined to at least one of the portion between the groove portion 33 and the electrode body 14 on the outer peripheral surface of the barrel 30 in the direction of the winding axis of the electrode body 14 by welding. Specifically, the second bent portion 67 of the second joining portion 62 is joined to a position on the outer side surface of the groove portion 33 that is lower than the valley point of the depression. The first joining portion 55 and the second joining portion 62 may also be joined to only one of the groove portion 33 and the portion between the groove portion 33 and the electrode body 14 on the outer peripheral surface of the barrel 30 by welding, respectively.

[0079] The external connection portion 69 is an arc-shaped plate-like shape that is connected by bending the upper ends of the first upper extension portion 57 and the second upper extension portion 64 at a substantially right angle relative to the upper extension portions 57 and 64, and extends in a direction different from the upper extension portions 57 and 64, and specifically extends in a manner opposite to the upper end portion 37 of the outer body 16. Thus, the first upper extension portion 57 and the second upper extension portion 64 are connected at two positions separated in the circumferential direction of the external connection portion 69.

[0080] Figure 7B It is configured with multiple Fig. 7A The battery module is as shown in FIG. Figure 7B In such a state, the plurality of batteries 10a are connected in series or in parallel or in a combination thereof. Figure 7B The plurality of batteries 10a in each column are arranged in a second direction ( Figure 7B The batteries in the second row A2 are arranged in the middle between the centers of two adjacent batteries in the first row A1 and the third row A3 in the second direction. Thus, the plurality of batteries 10a are arranged in a staggered manner, which can increase the density of the plurality of batteries 10a in the space. Figure 7B As shown in FIG. 1 , when a plurality of batteries 10a are viewed from above, the shape after connecting the centers of the batteries 10a with a straight line becomes a plane filling shape formed by arranging a plurality of rows of regular triangles that are alternately inverted upside down and connected. In this case, in each auxiliary electrode 40a, the circumferential centers of the first joint 55 and the second joint 62 are separated and arranged so that the central angle observed from the center of the battery is 60 degrees. Thus, as Figure 7B In this way, it is easy to arrange the central space of three adjacent batteries in a triangular configuration (for example Figure 7BThe joint portion (the oblique line portion S) is set as one joint portion 55 (or 62) of only one auxiliary electrode 40a. Therefore, in the battery module, the interval between the plurality of batteries 10a is not increased, and the portion protruding radially from the outer peripheral surface of the cylindrical portion 30 of the outer casing 16 in each central space can be reduced, making it easy to ensure the insulation distance.

[0081] According to the structure of this example, the auxiliary electrode 40a has a first joint portion 55 and a second joint portion 62 welded at positions separated in the circumferential direction of the cylinder portion 30 of the outer casing 16, and a first upper extension portion 57 extending upward from the first joint portion 55 and a second upper extension portion 64 extending upward from the second joint portion 62 are connected by an external connection portion 69. Thus, the auxiliary electrode 40a has two joint positions with respect to the outer casing 16, and thus the joint strength between the auxiliary electrode 40a and the outer casing 16 can be improved.

[0082] Furthermore, the welding part of the auxiliary electrode 40a to the cylinder 30 is formed by the first bent part 60 and the second bent part 67. Thus, each welding part of the auxiliary electrode 40a to the cylinder 30 is bent in a manner along the shape of the cylinder 30, thereby increasing the surface contact area between the welding part and the cylinder 30, and further improving the bonding strength. Figure 1 to Figure 5 The structure is the same.

[0083] [Third Example of Implementation]

[0084] Figure 8 1 is a perspective view showing the upper part of the battery 10b in another example (the third example) of the embodiment. First, the subject to be solved by this example is described. Specifically, in the background art, if the auxiliary electrode cannot be held on the outer body before the auxiliary electrode is joined to the outer body by welding, the workability of the welding operation is deteriorated. In addition, even after welding, if the auxiliary electrode is displaced relative to the outer body due to external force, there is a concern that mechanical stress is applied to the joint between the auxiliary electrode and the outer body and the reliability of the joint is reduced. The purpose of this example is to improve the reliability of the joint between the outer body and the auxiliary electrode in the battery. In the case of this example, the auxiliary electrode 40b includes two support portions 74 extending along the circumferential direction of the battery 10b, and each support portion 74 is inserted into the groove portion 33 of the outer body 16. As a result, it is easy to hold the auxiliary electrode 40b on the outer body 16 before welding the auxiliary electrode 40b to the outer body 16. In addition, after welding, the reliability of the connection of the auxiliary electrode 40b to the outer body 16 can also be improved. Thus, since the auxiliary electrode 40 b includes the support portion 74 inserted into the groove portion 33 , the workability of the welding work can be improved, and the reliability of the welded portion after the auxiliary electrode 40 b is welded to the exterior body 16 can be improved.

[0085] use Figures 9 to 13 The auxiliary electrode 40 b will be described in detail. Fig. 9 It is a perspective view of the auxiliary electrode 40b in the battery 10b. Fig.10 Observed from the back Fig. 9 A three-dimensional view of the auxiliary electrode 40b. Fig.11 yes Fig. 9 A view of the auxiliary electrode 40b taken along the arrow B. Fig.12 yes Fig.11 CC cross-sectional view. Fig.13 It is a development view of the auxiliary electrode 40b.

[0086] The auxiliary electrode 40b includes a joint portion 70 provided at the lower end portion and welded to the outer peripheral surface of the cylinder 30, a plate-shaped upper extension portion 72 connected to the upper side of the joint portion 70 and extending from the upper end of the joint portion 70 to the upper side of the cylinder 30 as the opening end side, and a plate-shaped external connection portion 75 bent at a substantially right angle from the upper end of the upper extension portion 72 to extend in a direction different from the upper extension portion 72. The joint portion 70 corresponds to the first joint portion, and the upper extension portion 72 corresponds to the first upper extension portion. The external connection portion 75 is the same as that of the auxiliary electrode 40.

[0087] The electrode bodies 14 ( Figure 3 ) The lower end of the side end is connected to two support parts 74 extending along the circumferential direction of the barrel 30. The two support parts 74 are arc-shaped plates extending along the outer side in the opposite direction of the circumferential direction, and the two support parts 74 are arranged on the same plane. In addition, in the battery disclosed in the present invention, the support part may not be connected to the lower end of the upper extension part. For example, it may extend from both ends of the upper extension part in the horizontal direction.

[0088] In the battery of the present disclosure, the support portion is not limited to an arc-shaped plate as long as it can be inserted into the groove portion of the cylindrical portion. For example, the support portion may be a substantially rectangular plate.

[0089] The engaging portion 70 is continuous from the lower end of the circumferential middle portion of the upper extending portion 72 and extends below the lower end of the groove portion 33. The portion of the engaging portion 70 facing the groove portion 33 is curved in a mountain shape with an arc cross section so as to be insertable into the opening of the groove portion 33.

[0090] The joint 70 is Figure 8 The joining portion 70 is joined to the cylindrical portion 30 of the outer package 16 in the portion indicated by the rectangle β. Specifically, the joining portion 70 is formed in the electrode body 14 ( Figure 3 ) in the winding axis direction of the tube portion 30, and joined to the portion between the groove portion 33 on the outer peripheral surface of the tube portion 30 and the electrode body 14 by welding.

[0091] Fig.14 yes Figure 8 A front view of battery 10b. Fig.15 The thickness of the components of the battery 10b is exaggerated. Fig.14 FIG. DD cross-section of FIG. The joint portion 70 may be joined to the groove portion 33 by welding. The joint portion 70 may also be joined to the valley point G ( Fig.15 ) and at least one of the portions of the barrel 30 extending from the lower end of the groove 33 to the bottom 32 and not facing the electrode body 14 on the inner side. The welding is laser welding, resistance welding, ultrasonic welding, etc. For example, the joint 70 may be Figure 8 The portion indicated by the rectangle β is joined to the outer casing 16 by welding, or the portion indicated by the rectangle β is joined to the outer side surface of the groove portion 33 at a position below the valley point G of the depression by welding instead of the portion indicated by the rectangle β.

[0092] The external connection portion 75 extends so as to face the upper end portion 37 of the outer casing 16. Another conductive member 100 ( Fig.15 ), thereby electrically connecting the external connection portion 75 to the conductive member 100.

[0093] In the auxiliary electrode 40 b, a central axis O1 ( Fig.11 ) Parallel notch 73 ( Fig.11 ). In this state, the two support portions 74 are arranged on both sides of the joint portion 70 in the circumferential direction.

[0094] like Fig.13 As shown, a flat metal plate is punched into the shape of the auxiliary electrode 40b before bending to form an intermediate blank 76, and a plurality of bending lines ( Fig.13 The intermediate blank 76 is bent along the dot-dashed lines a1 to a6 (shown in FIG. 1 ), thereby forming the auxiliary electrode 40 b. The dot-dashed lines a1 to a4 and a6 are Fig.13 The position of the top when the fold is formed in such a way that the surface side of the paper becomes the outer surface of the folded portion, and the single-point chain line a5 is Fig.13 The position of the valley portion when the film is bent so that the back side of the paper surface becomes the outer surface of the bent portion.

[0095] like Figure 8As shown, the auxiliary electrode 40b is held on the outer body 16 in a state where the support portion 74 is inserted into the groove portion 33, and in this state, the joint portion 70 of the auxiliary electrode 40b is joined to the outer body 16 by welding. As a result, before the auxiliary electrode 40b is welded to the outer body 16, it is easy to hold the auxiliary electrode 40b on the outer body 16, so that the position deviation of the auxiliary electrode 40b can be suppressed, and the workability of the welding operation is improved. In addition, in the state after welding, even if a force is applied to the upper extension portion 72 of the auxiliary electrode 40b in a direction in which rotation is generated with a given direction as an axis in the up-down direction, the displacement of the auxiliary electrode 40b relative to the outer body 16 can be suppressed by the engagement of the support portion 74 with the lower end of the groove portion 33. Therefore, it is possible to suppress the application of force in the above-mentioned direction to the welding portion.

[0096] The battery of this example comprises: an electrode body, which is wound by a first electrode and a second electrode with a separator interposed therebetween; an outer casing, which has a cylindrical barrel, an open end formed at one end of the barrel and a bottom that seals the other end of the barrel, accommodates the electrode body, and is electrically connected to the first electrode; a sealing body, which seals the open end of the outer casing together with a gasket and is electrically connected to the second electrode; and an auxiliary electrode, which has a first joint welded to the outer peripheral surface of the barrel, a plate-shaped first upper extension extending from the first joint to the open end side, and a plate-shaped external connection extending from the first upper extension to a different direction and connected to another conductive member, the barrel having a groove portion recessed on the outer peripheral surface so that the inner peripheral surface of the barrel protrudes, and the auxiliary electrode has the following structure: having at least one support portion extending along the circumferential direction of the barrel and inserted into the groove portion. According to the above structure, the displacement of the auxiliary electrode relative to the outer casing can be suppressed. Thus, the reliability of the joint between the auxiliary electrode and the outer casing can be improved.

[0097] More specifically, according to the above-mentioned battery 10b, in the structure in which the auxiliary electrode 40b is welded to the outer peripheral surface of the cylindrical portion 30 of the outer body 16, before the welding of the auxiliary electrode 40b, the auxiliary electrode 40b is held in the outer body 16 in a state in which the support portion 74 is inserted into the groove portion 33. Thus, it is possible to achieve an improvement in the workability of the welding operation of the auxiliary electrode 40b. Furthermore, in the state after the auxiliary electrode 40b is welded, even if a force is applied to the upper extension portion 72 of the auxiliary electrode 40b in the up-down direction, in the direction in which the auxiliary electrode 40b is rotated, the displacement of the auxiliary electrode 40b relative to the outer body 16 can be suppressed by the engagement of the support portion 74 with the groove portion 33. Thus, the bonding reliability of the auxiliary electrode 40b relative to the outer body 16 after welding can be improved.

[0098] Furthermore, the joint portion 70 of the auxiliary electrode 40b is joined to at least one of the groove portion 33 of the barrel 30 and the portion between the groove portion 33 and the electrode body 14 in the outer peripheral surface of the barrel 30. Thus, the influence of heat during welding of the auxiliary electrode 40b can be suppressed from affecting the portion on the side of the opening end 31 of the gasket 27 and the electrode body 14.

[0099] Furthermore, the joint portion 70 of the auxiliary electrode 40b is joined by welding to at least one of a position below the valley point G of the depression on the outer side surface of the groove portion 33 and a portion between the groove portion 33 and the electrode body 14 on the outer peripheral surface of the cylinder portion 30. Thus, the influence of heat during welding of the auxiliary electrode 40b can be suppressed from affecting the gasket 27 supporting the sealing body 17 together with the groove portion 33 and the electrode body 14.

[0100] [Fourth example of implementation]

[0101] Fig.16 This is a perspective view showing an extracted upper portion of a battery 10 c in another example (fourth example) of the embodiment. Fig.17 It is a perspective view of the auxiliary electrode 40c in the battery 10c. Fig.18 Observed from the back Fig.17 A three-dimensional view of the auxiliary electrode 40c. Fig.19 It is a development view of the auxiliary electrode 40c.

[0102] In the structure of this example, an auxiliary electrode 40c is used. The auxiliary electrode 40c has Figure 8 to Figure 15 The auxiliary electrode 40b shown in FIG. 1 is a structure in which two auxiliary electrodes 40b are arranged in a manner separated from each other in the circumferential direction of the battery 10c and their upper ends are connected. Specifically, the auxiliary electrode 40c has an end portion ( Fig.16 The first joining portion 77 and the first upward extending portion 79 are arranged at the left end portion of the outer casing 16, and the other end portion ( Fig.16 The first joint portion 77 is provided at the lower end portion at one end portion of the auxiliary electrode 40c and is welded to the outer peripheral surface of the cylinder 30. The first joint portion 77 extends from the lower end of the first upper extension portion 79 to below the lower end of the groove portion 33. The first upper extension portion 79 is connected to the upper side of the first joint portion 77 at one end portion of the auxiliary electrode 40c, and is in the shape of a plate extending from the upper end of the first joint portion 77 to the upper side. At one end portion in the circumferential direction of the lower end portion of the first upper extension portion 79 ( Fig.16 , Fig.17 The left end of Fig.18 The right end portion of the auxiliary electrode 40b is connected to a support portion 74 ( Fig.10 and Fig.11On the right side, Fig.12 The same first support portion 78 as on the left side.

[0103] The second joint portion 80 is welded separately from the first joint portion 77 in the circumferential direction of the cylindrical portion 30 of the outer casing 16. The second joint portion 80 is provided at the lower end portion of the other end portion of the auxiliary electrode 40c and is welded to the outer circumferential surface of the cylindrical portion 30. The second joint portion 80 extends from the lower end of the second upper extension portion 82 to below the lower end of the groove portion 33. The second upper extension portion 82 is connected to the upper side of the second joint portion 80 at the other end portion of the auxiliary electrode 40c, and is in the shape of a plate extending from the upper end of the second joint portion 80 to the upper side. The other end portion in the circumferential direction of the lower end portion of the second upper extension portion 82 ( Fig.16 and Fig.17 The right end of Fig.18 The left end portion of the auxiliary electrode 40b is connected to the support portion 74 ( Fig.10 and Fig.11 On the left side, Fig.12 The same second supporting portion 81 is provided on the right side of the device.

[0104] The external connection portion 84 is an arc-shaped plate-like shape that is connected by bending the upper ends of the first upper extension portion 79 and the second upper extension portion 82 at a substantially right angle to the upper extension portions 79 and 82 on the same side as the support portions 78 and 81, and extends in a direction different from the upper extension portions 79 and 82. Thus, the first upper extension portion 79 and the second upper extension portion 82 are connected at two positions separated in the circumferential direction of the external connection portion 84.

[0105] The first support portion 78 connected to the first upward extending portion 79 and the second support portion 81 connected to the second upward extending portion 82 are arc-shaped plates arranged close to each other. The two support portions 78 and 81 are arranged on one plane.

[0106] like Fig.19 As shown, a flat metal plate is punched into the shape of the auxiliary electrode 40c before bending to form an intermediate blank 85, and a plurality of bending lines ( Fig.19 The intermediate blank 85 is bent along the dotted dashed lines b1 to b10 to form the auxiliary electrode 40c. The dotted dashed lines b1 to b3, b5 to b8, and b10 are Fig.19 The top position when the bending is formed in such a way that the surface side of the paper becomes the outer surface of the bending portion, and the single-point chain lines b4 and b9 are Fig.19 The position of the valley portion when the film is bent so that the back side of the paper surface becomes the outer surface of the bent portion.

[0107] like Fig.16As shown, the auxiliary electrode 40c is held by the outer casing 16 in a state where the supporting portions 78 and 81 are inserted into the groove portion 33, and in this state, the joint portions 77 and 80 of the auxiliary electrode 40c are joined to the outer casing 16 by welding. In this state, the supporting portions 78 and 81 are shaped along a portion of the circumferential direction of the groove portion 33.

[0108] In this case, with Figure 7B The battery arrangement of the battery module shown may also be configured such that the first bonding portion 77 and the second bonding portion 80 are separated and arranged at the circumferential center of the auxiliary electrode 40 c so that the central angle thereof as viewed from the battery center is 60 degrees.

[0109] According to the structure of this example, like the auxiliary electrode 40a, the auxiliary electrode 40c has two joint positions with respect to the outer casing 16, so that the joint strength between the auxiliary electrode 40c and the outer casing 16 can be improved. In this example, the other structures and functions are the same as those of the auxiliary electrodes 40, 40a, 40b.

[0110] In addition, among the auxiliary electrodes 40 , 40 a , 40 b , and 40 c , only one supporting portion inserted into the groove portion 33 may be provided in the auxiliary electrodes 40 b and 40 c .

[0111] [Fifth Example of Implementation]

[0112] Fig. 20 It is a perspective view of the upper portion of a battery 10d in another example (fifth example) of the embodiment. Fig.21 is a side view of the battery 10d. Fig. 22 It is a perspective view of the auxiliary electrode 40d in the battery 10d. Fig.23 Observed from the back Fig. 22 A three-dimensional view of the auxiliary electrode 40d.

[0113] In the case of this example, unlike the auxiliary electrode 40b, the auxiliary electrode 40d does not have a joint portion connected to the lower end of the upper extension portion 72 and extending to the lower side of the lower end of the groove portion 33. In the case of this example, the auxiliary electrode 40d includes an arc-shaped support portion 86 connected to the lower end of the upper extension portion 72. The support portion 86 includes an arc-shaped plate-shaped main body portion 87 and an arc-shaped curved surface portion 88 connected to the outer peripheral surface of the circumferential center portion of the main body portion 87. The support portion 86 is connected to the lower end of the upper extension portion 72 at the upper end of the curved surface portion 88. Thus, the support portion 86 is along a direction that is approximately 90 degrees different from the upper extension portion 72. The support portion 86 extends along the circumferential direction of the cylindrical portion 30 of the outer body 16.

[0114] Furthermore, if Fig.21As shown, the main body 87 of the support portion 86 extends along the circumferential direction in a winding manner on both sides of the thickness direction. Therefore, the main body 87 becomes a corrugated gasket. Thus, when the support portion 86 is inserted into the groove portion 33 of the outer body 16, the upper end and the lower end of the support portion 86 are close to the upper end and the lower end of the groove portion 33, respectively. At this time, the upper end and the lower end of the support portion 86 can also be pressed against the upper end and the lower end of the groove portion 33.

[0115] like Fig. 20 , Fig.21 As shown, the auxiliary electrode 40d is held in the outer casing 16 with the support portion 86 inserted into the groove portion 33. In this state, the curved surface portion 88 of the auxiliary electrode 40d and the open lower end portion of the groove portion 33 are connected as a joint. Fig.21 The positions shown by arrows P are joined by welding.

[0116] According to the structure of this example, the support portion 86 extends in a meandering manner along the circumferential direction, so that before welding the auxiliary electrode 40d, the support portion 86 can suppress the auxiliary electrode 40d from being separated from the outer body 16, and the auxiliary electrode 40d can be easily held on the outer body 16 by suppressing the displacement such as the tilt of the support portion 86 in the groove portion 33. In this example, the other structures and functions are the same as those of the auxiliary electrode 40b.

[0117] In the auxiliary electrodes 40 b and 40 c , similarly to the auxiliary electrode 40 d , the support portions 74 , 78 , and 81 may extend in a circumferential direction in a meandering manner on both sides in the thickness direction.

[0118] [Sixth Example of Implementation]

[0119] Fig.24 This is a perspective view of an auxiliary electrode 40e taken out of a battery in another example (the sixth example) of the embodiment. In this example, the auxiliary electrode 40e is set to a ring shape formed by combining two semicircular elements. Specifically, Fig.24 As shown, the auxiliary electrode 40e includes a first semicircular element 90 and a second semicircular element 95. The first semicircular element 90 includes a first main body 91 in a semicircular plate shape and one end portion ( Fig.24 The upper extension part 72 connected to the outer periphery of the left end of the auxiliary electrode 40d and the external connection part 75 connected to the upper end of the upper extension part 72. By forming the locking grooves 92 on the inner periphery of the two ends of the circumferential direction of the first body 91, the two ends of the circumferential direction of the first body 91 are substantially L-shaped. The first body 91 extends along the circumferential direction in a meandering manner on both sides in the thickness direction, similarly to the support part 86 of the auxiliary electrode 40d.

[0120] The second semicircular element 95 is in the shape of a semicircular plate, and has substantially L-shaped protrusions 96 protruding in the circumferential direction on the inner circumferential sides of both ends of the circumferential direction. The second semicircular element 95 also extends along the circumferential direction in a meandering manner on both sides in the thickness direction, similarly to the first main body 91 of the first semicircular element 90. The auxiliary electrode 40e is formed into a ring shape as a whole by locking the front ends of the two protrusions 96 of the second semicircular element 95 in the two locking grooves 92 of the first main body 91. The first main body 91 and the second semicircular element 95 are equivalent to the support portion.

[0121] The auxiliary electrode 40e is inserted into the groove portion 33 in a manner of approaching each other from both sides in the radial direction of the battery, with the first semicircular element 90 and the second semicircular element 95 separated, and the two protrusions 96 of the second semicircular element 95 are locked in the two locking grooves 92 of the first semicircular element 90, thereby combining the first semicircular element 90 and the second semicircular element 95. In this state, the auxiliary electrode 40e is held by the outer casing 16. In this state, the connecting portion between the first body 91 of the first semicircular element 90 and the upper extension portion 72, or the upper extension portion 72 side end of the second semicircular element 95 and the open lower end of the groove portion 33 are joined by welding in the same manner as the auxiliary electrode 40d.

[0122] According to the structure of this example, the annular portion of the auxiliary electrode 40e is arranged inside the entire circumference of the groove portion 33, so before welding the auxiliary electrode 40e, the auxiliary electrode 40e can be further suppressed from being separated in the radial direction relative to the outer casing 16 than the auxiliary electrode 40d. At the same time, it is easier to hold the auxiliary electrode 40e on the outer casing 16. In this example, the other structures and functions are the same as those of the auxiliary electrode 40d.

[0123] In the above-mentioned examples, the external connection portions 47, 69, 75, 84 of the auxiliary electrodes 40, 40a to 40e extend in a manner opposite to the upper end portion 37 of the outer casing 16, but may extend along the opposite side to the upper end portion 37 of the outer casing 16. In addition, the external connection portions 47, 69, 75, 84 may be located below the upper end of the outer casing 16.

[0124] In addition, if Figure 1 to Figure 5 structure or Figure 6 7 , in a structure in which the lower extension portion (lower extension portion 49, first lower extension portion 58) of the first joining portion (joining portion 41, first joining portion 55) has a first bending portion 51, 60 and the first bending portion is joined to the groove portion 33, or in a structure in which the second lower extension portion 65 of the second joining portion 62 has a second bending portion 67 and the second bending portion is connected to the groove portion 33, the auxiliary electrode may also be provided with a structure having at least one supporting portion extending along the circumferential direction of the barrel portion 30 and inserted into the groove portion 33.

[0125] In the above-mentioned structures, the case where the outer casing 16 is used as the negative terminal and the sealing body 17 is used as the positive terminal is described, but the outer casing 16 may be used as the positive terminal and the sealing body 17 may be used as the negative terminal. In this case, the first electrode becomes the positive electrode and the second electrode becomes the negative electrode.

[0126] Explanation of symbols

[0127] 10, 10a, 10b, 10c, 10d: battery; 11: positive electrode; 12: negative electrode; 13: separator; 14: electrode body; 16: outer body; 17: sealing body; 18a, 18b: insulating plate; 19: positive electrode lead; 20a, 20b: negative electrode lead; 22: filter; 23: lower valve body; 24: insulating member; 25: upper valve body; 26: cover body; 27: gasket; 30: barrel; 31: opening 32: bottom; 33: groove; 37: upper end; 40, 40a, 40b, 40c, 40d, 40e: auxiliary electrodes; 41: joint; 45: upper extension; 47: external connection; 49: lower extension; 50: first notch; 51: first bending; 55: first joint; 57: first upper extension; 58: first lower extension; 59: first notch; 60: first Bending portion; 62: second joining portion; 64: second upper extension portion; 65: second lower extension portion; 66: second notch; 67: second bending portion; 69: external connection portion; 70: joining portion; 72: upper extension portion; 73: notch; 74: supporting portion; 75: external connection portion; 76: intermediate blank; 77: first joining portion; 78: first supporting portion; 79: first upper extension portion; 80: second joining portion; 8 1: second supporting portion; 82: second upper extension portion; 84: external connecting portion; 85: intermediate blank; 86: supporting portion; 87: main body; 88: curved portion; 90: first semicircular element; 91: first main body; 92: locking groove; 95: second semicircular element; 96: protrusion; 100: conductive member; 101: retaining member; 102: main body; 103: box portion; 104: retaining hole; 105: welding head.

Claims

1. A battery having: The electrode body is formed by winding the first electrode and the second electrode with a separator interposed therebetween; An outer casing having a cylindrical barrel, an open end formed at one end of the barrel, and a bottom portion closing the other end of the barrel, accommodating the electrode body and electrically connected to the first electrode; a sealing body, which seals the open end of the outer body together with a gasket and is electrically connected to the second electrode; and an auxiliary electrode having a first joint portion welded to the outer peripheral surface of the barrel portion, a plate-shaped first upper extension portion extending from the first joint portion toward the opening end, and a plate-shaped external connection portion extending from the first upper extension portion in a different direction and connected to another conductive member, The cylindrical portion has a groove portion whose outer peripheral surface is recessed so that the inner peripheral surface of the cylindrical portion protrudes. The sealing body is disposed on the groove portion via the gasket. The first joining portion is joined to at least one of the groove portion and a portion between the groove portion and the electrode body in the outer peripheral surface of the cylindrical portion. The auxiliary electrode includes at least one supporting portion extending along a circumferential direction of the cylindrical portion and inserted into the groove portion.

2. The battery according to claim 1, wherein The first bonding portion includes a lower extending portion that is continuous from the electrode body side end of the first upper extending portion and extends to a portion exceeding the lower end of the groove portion. A first notch is formed in a portion of the lower extending portion that is opposite to the groove portion. The downward extending portion has a first bent portion adjacent to the first notch and bent toward the outer body. The first bent portion is joined to the groove portion.

3. The battery according to claim 2, wherein The first notch is U-shaped and opened on the electrode body side. The first bent portion is disposed in a portion of the downward extending portion that is surrounded by the first notch.

4. The battery according to claim 1, wherein The auxiliary electrode includes a second joint portion welded away from the first joint portion in the circumferential direction of the cylindrical portion of the outer casing, and a second upward extending portion extending from the second joint portion toward the opening end side. The first upward extending portion and the second upward extending portion are connected at two locations separated in the circumferential direction of the external connecting portion.

5. The battery according to claim 2, wherein The auxiliary electrode includes a second joining portion detachably joined to the first joining portion in the circumferential direction of the cylindrical portion of the outer casing, and a second upward extending portion extending from the second joining portion toward the opening end side. The first upper extending portion and the second upper extending portion are connected at two locations separated in the circumferential direction of the external connecting portion, The second bonding portion includes a second lower extending portion which is continuous from the electrode body side end of the second upper extending portion and extends to a portion exceeding the lower end of the groove portion. A second notch is formed in a portion of the second lower extending portion that is opposite to the groove portion. The second downward extending portion has a second bent portion adjacent to the second notch and bent toward the outer body. The second bent portion is joined to the groove portion.

6. The battery according to claim 5, wherein The second notch is U-shaped and opens on the electrode body side. The second bent portion is disposed in a portion of the second downward extending portion that is surrounded by the second notch.

7. A battery having: The electrode body is formed by winding the first electrode and the second electrode with a separator interposed therebetween; An outer casing having a cylindrical barrel, an open end formed at one end of the barrel, and a bottom portion closing the other end of the barrel, accommodating the electrode body and electrically connected to the first electrode; a sealing body, which seals the open end of the outer body together with a gasket and is electrically connected to the second electrode; and an auxiliary electrode having a first joint portion welded to the outer peripheral surface of the barrel portion, a plate-shaped first upper extension portion extending from the first joint portion toward the opening end, and a plate-shaped external connection portion extending from the first upper extension portion in a different direction and connected to another conductive member, The cylindrical portion has a groove portion whose outer peripheral surface is recessed so that the inner peripheral surface of the cylindrical portion protrudes. The auxiliary electrode has at least one supporting portion extending along the circumferential direction of the cylindrical portion and inserted into the groove portion. The at least one support portion extends along the circumferential direction in a meandering manner on both sides in the thickness direction.

8. The battery according to claim 7, wherein The at least one supporting portion is two supporting portions arranged on both sides in the circumferential direction of the first joining portion.

9. The battery according to claim 7, wherein The auxiliary electrode includes a second joint portion welded separately from the first joint portion in the circumferential direction of the cylindrical portion of the outer casing, and a second upward extending portion extending from the second joint portion toward the opening end side. The first upper extending portion and the second upper extending portion are connected at two locations separated in the circumferential direction of the external connecting portion, The at least one support portion is: a first supporting portion connected to the first upper extending portion, extending along the circumferential direction of the cylindrical portion, and inserted into the groove portion; and The second supporting portion is connected to the second upward extending portion, extends along the circumferential direction, and is inserted into the groove portion.

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