Battery

Abstract

The present invention provides a battery using an electrode terminal formed by friction crimping while maintaining or improving sealing properties. A battery (1) is provided with: a charge / discharge body (100); an exterior body (lid 420) which accommodates the charge / discharge body and in which a through hole (negative electrode-side insertion hole 420b) is formed; a sealing body (negative electrode-side gasket 630) which is provided on the exterior body; and an electrode terminal (negative electrode terminal 320) which is provided on the sealing body. The electrode terminal includes a first portion (insertion portion 322) inserted into the through hole of the package and indirectly or directly bonded to the charging / discharging body, and a second portion (main body portion 321) exposed to the outside of the package, lower in rigidity than the first portion, and bonded to the bus bar or the electrical device. The first portion and the second portion are joined by friction crimping. The second portion includes a protruding portion (a raised portion 320e or a cut molded portion 320f) that annularly surrounds an outer peripheral surface (322b) of the first portion and protrudes toward the seal body at a joint portion thereof with the first portion. The protruding portion is in contact with the sealing body.

Description

Technical Field

[0001] The present invention relates to batteries. Background Art

[0002] Conventionally, electrode terminals and the like formed by friction welding members made of different materials are known (see Patent Documents 1 to 6). Prior art literature Patent Literature

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 3-295260 [Patent Document 2] Japanese Patent Application Laid-Open No. 11-176268 [Patent Document 3] Japanese Patent Application Laid-Open No. 4-143085 [Patent Document 4] Japanese Patent Application Laid-Open No. 6-47570 [Patent Document 5] Japanese Patent Application Laid-Open No. 6-292984 [Patent Document 6] Japanese Patent Application Publication No. 2022-49727 Summary of the invention Problem that the invention aims to solve

[0004] There is a demand for a battery using an electrode terminal formed by frictionally welding members made of different materials while maintaining or improving the sealing performance of a sealing body with respect to an outer casing and an electrode terminal. Technical means of solving problems

[0005] The first battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly joined to the charging and discharging body; and a second part, which is exposed to the outside of the outer body, has lower rigidity than the first part, and is joined to a busbar or an electrical device. The first part and the second part are joined by friction welding. The second part includes a protrusion protruding toward the sealing body along the outer circumference of the first part at the joining portion joined to the first part. The protrusion is in contact with the sealing body.

[0006] The second battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the second part are connected by friction welding. The second part includes a planar part that has been cut in a portion adjacent to the connection portion between the second part and the first part.

[0007] The third battery of the present invention has: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the second part are connected by friction welding. The first part includes: a first shaft part, which is connected to the second part; a second shaft part, which is connected to the first shaft part, and has a shape smaller than the first shaft part along a direction intersecting the stacking direction of the second shaft part and the first shaft part.

[0008] The fourth battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the second part are joined by friction welding. The part of the second part exposed to the outside of the outer body contacts the sealing body along the stacking direction of the second part and the first part, but does not contact the sealing body along the direction intersecting the stacking direction.

[0009] The fifth battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which includes a convex part that partially protrudes toward the first part, is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the convex part are joined by friction welding. The convex part includes a protrusion that protrudes toward the sealing body in a direction intersecting with the stacking direction of the first part and the second part. At the joint portion between the first part and the convex part, the surface area of ​​the first part is larger than the surface area of ​​the convex part except for the protrusion.

[0010] The sixth battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which includes a convex part that partially protrudes toward the first part, is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the convex part are joined by friction welding. The convex part includes a protrusion that protrudes toward the sealing body in a direction intersecting the stacking direction of the first part and the second part. The protrusion is in contact with the sealing body.

[0011] The seventh battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which includes a convex part that partially protrudes toward the first part, is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the convex part are joined by friction welding. The convex part includes a protrusion that protrudes toward the sealing body in a direction intersecting the stacking direction of the first part and the second part. The sealing body includes a concave recessed part in the part opposite to the protruding part. The protruding part is inserted into the recessed part.

[0012] The eighth battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which includes a convex part that partially protrudes toward the first part, is exposed to the outside of the outer body, has lower rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the convex part are joined by friction welding. The convex part includes a cut-shaped part that is cut along the stacking direction of the convex part and the first part at a part adjacent to the joining part of the convex part and the first part. The cut-shaped part is opposite to the sealing body in a direction intersecting the stacking direction.

[0013] The ninth battery of the present invention comprises: a charging and discharging body; an outer body, which accommodates the charging and discharging body and is formed with a through hole; a sealing body, which is arranged on the outer body; and an electrode terminal, which is arranged on the sealing body. The electrode terminal includes: a first part, which is inserted into the through hole of the outer body and is indirectly or directly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer body, has higher rigidity than the first part, and is connected to a busbar or an electrical device. The first part and the second part are joined by friction welding. The second part includes a protrusion protruding toward the sealing body along the outer circumference of the first part at the joint portion with the first part. The protrusion is in contact with the sealing body. Effects of the Invention

[0014] According to the present invention, a battery can be obtained which uses electrode terminals formed by frictionally welding members of different materials while maintaining or improving the sealing performance of the sealing body with respect to the outer casing and the electrode terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view showing the battery 1 according to the first embodiment. Figure 2 It is expressed in cross section. Figure 1 FIG. 2 is a side view of components around the positive electrode terminal 310 of the battery 1 in the region 2A- 2B. Figure 3 It is expressed in cross section. Figure 1 FIG. 4 is a side view of components around the negative electrode terminal 320 of the battery 1 in the region 3A-3B. Figure 4 It is a perspective view showing the battery 1 partially exploded. Figure 5 Yes means Figure 4 A three-dimensional diagram of a charging and discharging body 100. Figure 6It is expressed in cross section. Figure 5 FIG. 6 is a side view of a portion of the charge / discharge body 100 in the region 6A-6B. Figure 7 It is a decomposition representation Figure 1 1 is a perspective view of components surrounding the positive electrode terminal 310 of the battery 1. Figure 8 It is a decomposition representation Figure 1 1 is a perspective view of components surrounding the cleavage valve 430 and the sealing plug 440 of the battery 1. Fig. 9 It is a decomposition representation Figure 1 1 is a perspective view of components surrounding the negative electrode terminal 320 of the battery 1. Fig.10 About Figure 1 A side view showing a method for manufacturing the negative electrode terminal 320 of the battery 1, wherein the first portion 320P and the second portion 320Q of the negative electrode terminal 320 are separated from each other in cross section. Fig.11 Then Fig.10 , a side view showing a state in which the first portion 320P and the second portion 320Q of the negative electrode terminal 320 are in contact with each other in cross section. Fig.12 Then Fig.11 , a side view showing a state in which a first portion 320P and a second portion 320Q of the negative electrode terminal 320 are frictionally pressed together to generate a recessed portion 320d and a raised portion 320e in cross section. Fig.13 Then Fig.12 , a side view showing a state in which a raised portion 320e of a negative electrode terminal 320 is cut to form a cut-shaped portion 320f in cross section. Fig.14 This is a side view showing a state in which a triangular cut-and-formed portion 330 f is formed in a cross section in a negative electrode terminal 330 according to Modification 1 of the first embodiment. Fig.15 This is a side view showing a state in which a rectangular cut-shaped portion 340 f which is relatively long in the longitudinal direction X and the width direction Y is formed in a negative electrode terminal 340 according to the second modification of the first embodiment. Fig.16 This is a side view showing a state in which a relatively long rectangular cut-shaped portion 350 f is formed in the height direction Z in a negative electrode terminal 350 according to the third modification of the first embodiment. Fig.17 This is a side view showing a state in which a flat surface portion 360r is formed without forming a cut-and-formed portion, in a negative electrode terminal 360 according to Modification 4 of the first embodiment, with a cross section. Fig.18 This is a side view showing a cross-section of a negative electrode terminal 370 according to Modification 5 of the first embodiment before friction welding. Fig.19 This is a side view showing a cross-section of a negative electrode terminal 370 according to Modification 5 of the first embodiment after friction welding. Fig. 20 It is a side view showing the components around the negative electrode terminal 380 of the battery 2 according to the second embodiment in cross section. Fig.21 About Fig. 20 A side view of a method for manufacturing a negative terminal 380 of a battery 2, showing a state in which a central axis S2 of a first portion 380P and a central axis S1 of a second portion 320Q of the negative terminal 380 are relatively aligned and the first portion 380P and the second portion 320Q are in contact with each other. Fig. 22 The display is shown with the cross section removed. Fig.21 A bottom view of the negative terminal 380. Fig.23 Then Fig.21 and Fig. 22 , a side view showing a state in which the central axis S2 of the first portion 380P and the central axis S1 of the second portion 320Q are not relatively aligned after the first portion 380P and the second portion 320Q of the negative terminal 380 are frictionally pressed together. Fig.24 The display is shown with the cross section removed. Fig.23 A bottom view of the negative terminal 380. Fig.25 Then Fig.23 and Fig.24 , a side view showing a state in which the outer peripheral surface 380b of the first portion 380P of the negative terminal 380 is cut so that the central axis S2 of the first portion 380P and the central axis S1 of the second portion 320Q are relatively aligned with each other. Fig.26 The display is shown with the cross section removed. Fig.25 A bottom view of the negative terminal 380. Fig. 27 It is a side view showing the components around the negative electrode terminal 390 of the battery 3 according to the first modification of the second embodiment in cross section. Fig.28 About Fig. 27 A side view of a method for manufacturing a negative terminal 390 of a battery 3, showing a state in which a central axis S2 of a first portion 320P and a central axis S1 of a second portion 320Q of the negative terminal 390 are relatively aligned and the first portion 320P and the second portion 320Q are in contact with each other. Fig.29The display is shown with the cross section removed. Fig.28 A bottom view of the negative terminal 390. Fig.30 Then Fig.28 and Fig.29 , a side view showing a state in which the central axis S2 of the first portion 320P and the central axis S1 of the second portion 320Q are not relatively aligned after the first portion 320P and the second portion 320Q of the negative terminal 390 are frictionally pressed together. Fig.31 The display is shown with the cross section removed. Fig.30 A bottom view of the negative terminal 390. Fig.32 It is a side view showing the components around the negative electrode terminal 710 of the battery 4 according to the third embodiment in cross section. Fig.33 About Fig.32 A side view showing a method of manufacturing a negative electrode terminal 710, and showing a state in which a first portion 710P and a second portion 710Q of a negative electrode terminal 710 are in contact with each other in cross section. Fig.34 Then Fig.33 , a side view showing a state in which a first portion 710P and a second portion 710Q of a negative electrode terminal 710 are frictionally pressed together to generate a raised portion 710e in cross section. Fig.35 It is a side view showing the components around the negative electrode terminal 720 of the battery 5 according to the first modification of the third embodiment in cross section. Fig.36 It is a side view showing the components around the negative electrode terminal 720 of the battery 6 according to the second modification of the third embodiment in cross section. Fig.37 It is a side view showing the components around the negative electrode terminal 730 of the battery 7 according to the third modification of the third embodiment in cross section. Fig.38 It is a side view showing the components around the negative electrode terminal 810 of the battery 8 according to the fourth embodiment in cross section. Fig.39 About Fig.38 A side view showing a method for manufacturing a negative electrode terminal 810, and showing a state in which a first portion 710P and a second portion 810Q of a negative electrode terminal 810 are in contact with each other in cross section. Fig.40 Then Fig.39 , a side view showing a state in which a first portion 710P and a second portion 810Q of a negative electrode terminal 810 are frictionally pressed together to generate a raised portion 810e in cross section. Fig.41It is a side view showing the components around the negative electrode terminal 810 of the battery 9 according to the first modification of the fourth embodiment in cross section. Fig.42 It is a side view showing the components around the negative electrode terminal 820 of the battery 10 according to the second modification of the fourth embodiment in cross section. Fig.43 It is a side view showing the components around the negative electrode terminal 910 of the battery 11 according to the fifth embodiment in cross section. Fig.44 It is a side view showing the components around the positive electrode terminal 1010 of the battery 12 according to the sixth embodiment in cross section. DETAILED DESCRIPTION

[0016] Embodiments for implementing the present invention are described with reference to the accompanying drawings. In order to facilitate understanding of each embodiment, the size and ratio of components are sometimes exaggerated in each drawing. Fig.25 and Fig.26 In the negative terminal 380 shown, the relative positional offset between the central axis S2 of the first part 380P and the central axis S1 of the second part 320Q is exaggeratedly illustrated. In each of the drawings, the same symbols are assigned to the same components. In each of the drawings, the length direction X, the width direction Y, and the height direction Z of the battery 1 are indicated by arrows. In each of the drawings, the length direction X, the width direction Y, and the height direction Z of the battery 1 indicate the relative positional relationship in the same drawing. That is, when the battery 1 is rotated 180 degrees so that the upper surface and the lower surface are reversed, or when the battery 1 is rotated 90 degrees so that the upper surface is configured as a side surface, the length direction X, the width direction Y, and the height direction Z of the battery 1 change.

[0017] In each embodiment and modification of each embodiment, the same reference numerals are attached to the same configuration as the above configuration, and repeated description is omitted. The same configuration as the above configuration includes, in addition to the same configuration as the above configuration, substantially the same configuration as the above configuration.

[0018] (Battery 1 of First Embodiment) (Constitution of Battery 1) The battery 1 of the first embodiment corresponds to a specific example of the first battery described in the means for solving the problem. Figures 1 to 9 The structure of the battery 1 will be described.

[0019] Figure 1 It is a perspective view showing the battery 1 according to the first embodiment. Figure 2 It is expressed in cross section. Figure 1 FIG. 2 is a side view of components around the positive electrode terminal 310 of the battery 1 in the region 2A- 2B. Figure 3 It is expressed in cross section. Figure 1 FIG. 4 is a side view of components around the negative electrode terminal 320 of the battery 1 in the region 3A-3B. Figure 4 It is a perspective view showing the battery 1 partially exploded. Figure 5 Yes means Figure 4 A three-dimensional diagram of a charging and discharging body 100. Figure 6 It is expressed in cross section. Figure 5 FIG. 6 is a side view of a portion of the charge / discharge body 100 in the region 6A-6B. Figure 7 It is a decomposition representation Figure 1 1 is a perspective view of components surrounding the positive electrode terminal 310 of the battery 1. Figure 8 It is a decomposition representation Figure 1 1 is a perspective view of components surrounding the cleavage valve 430 and the sealing plug 440 of the battery 1. Fig. 9 It is a decomposition representation Figure 1 1 is a perspective view of components surrounding the negative electrode terminal 320 of the battery 1.

[0020] The battery 1 includes a charge-discharge body 100 for performing charge and discharge, a current collector 200 connected to the charge-discharge body 100, and an electrode terminal 300 connected to the current collector 200. In addition, the battery 1 includes an outer casing 400 for accommodating or mounting components of the battery 1, an insulator 500 for insulating the components of the battery 1 from the outer casing 400, and a sealing body 600 for sealing the components of the battery 1 and the outer casing 400.

[0021] The charge / discharge body 100 performs charge and discharge. Figures 2 to 6 The charge-discharge body 100 shown includes a positive electrode 110, a negative electrode 120, a separator 130, and an electrolyte 140. The charge-discharge body 100 is formed by winding constituent members stacked in this order, namely, the positive electrode 110, the separator 130, the negative electrode 120, and the separator 130 into a rectangular parallelepiped shape. The charge-discharge body 100 may be formed by winding or by stacking.

[0022] The positive electrode 110 includes a long positive electrode current collecting layer 111 and a positive electrode active material layer 112 bonded to both sides of the positive electrode current collecting layer 111. Figure 5 As shown, the positive electrode 110 is wound together with the negative electrode 120 and the separator 130 to form a rectangular parallelepiped shape with the end portion bent into a convex shape. One side portion 111a of the positive electrode current collecting layer 111 is not covered by the separator 130 but is exposed to the outside. The positive electrode active material layer 112 is not bonded to the side portion 111a. Figure 4As shown, the central part of the side portion 111a is compressed along the width direction Y of the battery 1 in the bundled state. The side portion 111a is bonded to the positive electrode collector plate 210. The positive electrode active material layer 112 is bonded to the portion of the positive electrode collector layer 111 other than the side portion 111a. The positive electrode active material layer 112 is bonded to both sides of the positive electrode collector layer 111. The positive electrode 110 can also be a structure in which the positive electrode active material layer 112 is bonded only to one side of the positive electrode collector layer 111. The positive electrode collector layer 111 is formed, for example, of aluminum or an aluminum alloy. The positive electrode active material layer 112 contains a positive electrode active material composed of a lithium-containing composite oxide, a binder, and a conductive additive. In the lithium-containing composite oxide, for example, metal elements such as nickel (Ni), cobalt (Co), and manganese (Mn) and lithium (Li) are used.

[0023] The negative electrode 120 includes a long negative electrode current collecting layer 121 and a negative electrode active material layer 122 bonded to both sides of the negative electrode current collecting layer 121. Figure 5 As shown, the negative electrode 120 is wound together with the positive electrode 110 and the separator 130 to form a rectangular parallelepiped shape with the end portion bent into a convex shape. One side portion 121a of the negative electrode current collector layer 121 is not covered by the separator 130 but is exposed to the outside. The negative electrode active material layer 122 is not bonded to the side portion 121a. Figure 4 As shown in FIG. 1 , the central portion of the side portion 121 a is compressed in the width direction Y of the battery 1 in the bundled state. Figure 5 As shown, the side portion 121a of the negative electrode collector layer 121 is opposite to the side portion 111a of the positive electrode collector layer 111 along the length direction X of the battery 1. The side portion 121a is bonded to the negative electrode collector plate 220. The negative electrode active material layer 122 is bonded to the portion of the negative electrode collector layer 121 other than the side portion 121a. The negative electrode active material layer 122 is bonded to both sides of the negative electrode collector layer 121. The negative electrode 120 may also be a structure in which the negative electrode active material layer 122 is bonded only to one side of the negative electrode collector layer 121. The negative electrode collector layer 121 is formed, for example, of copper or a copper alloy. The negative electrode active material layer 122 contains a negative electrode active material made of a carbon-based material, a binder, and a conductive aid. Carbon-based materials, for example, use graphite.

[0024] The separator 130 insulates the positive electrode 110 and the negative electrode 120 while allowing lithium ions to pass through. The separator 130 is formed in a long strip shape. The separator 130 is made of a porous material. The separator 130 uses polyethylene (PE: polyethylene) or polypropylene (PP: polypropylene). An insulating member may be used instead of the separator 130. The insulating member may be provided on the side of the positive electrode 110 opposite to the negative electrode 120. The insulating member may also be provided on the side of the negative electrode 120 opposite to the positive electrode 110. The insulating member may also use a heat-resistant member. In the case of such a structure, the separator 130 is not necessary.

[0025] The electrolyte 140 allows lithium ions to flow between the positive electrode 110 and the negative electrode 120. The electrolyte 140 is also called an electrolytic solution. The electrolyte 140 includes a solvent and a solute. The electrolyte 140 may include an additive. The solvent includes, for example, an organic solvent. For example, carbonates such as ethylene carbonate are used as organic solvents. For example, a solute includes a lithium salt. For example, lithium hexafluorophosphate (LiPF6) is used as a lithium salt.

[0026] The current collector 200 is connected to the charging / discharging body 100. The current collector 200 is also called a current collecting plate. Figures 2 to 4 , Figure 7 and Fig. 9 The illustrated current collector 200 includes a positive current collector plate 210 and a negative current collector plate 220 .

[0027] like Figure 4 As shown, the positive electrode collector plate 210 connects the positive electrode 110 and the positive electrode terminal 310. Figure 7 As shown, the positive electrode collector plate 210 includes a base portion 211 and a collector portion 212. Figure 2 As shown, the base 211 is joined to the joint portion 313 of the positive terminal 310. For example, the base 211 and the joint portion 313 are joined by riveting the joint portion 313. Figure 7 As shown in FIG. 1 , the base 211 is formed in a plate shape. A circular through insertion hole 211a is formed on the base 211. Figure 2 As shown, the joint portion 313 of the positive electrode terminal 310 is inserted into the insertion hole 211a of the base 211. The collector portion 212 is joined to the side portion 111a of the positive electrode 110 by, for example, ultrasonic bonding or laser welding. Figure 7 As shown, the current collecting portion 212 is formed by bending downward from the outer edge of the base 211 in the height direction Z. The current collecting portion 212 extends orthogonally to the base 211. The current collecting portion 212 is formed integrally with the base 211. The current collecting portion 212 is bent in the width direction Y along the outer shape of the side portion 111a of the positive electrode 110. The positive electrode current collecting plate 210 is formed of, for example, aluminum or an aluminum alloy.

[0028] like Figure 4 As shown, the negative electrode collector plate 220 connects the negative electrode 120 and the negative electrode terminal 320. The outer shape of the negative electrode collector plate 220 is symmetrical with the outer shape of the positive electrode collector plate 210 along the length direction X. Fig. 9 As shown, the negative electrode collector plate 220 includes a base 221 and a collector portion 222. Figure 3 As shown, the base 221 is joined to the joint portion 323 of the negative terminal 320. For example, the base 221 and the joint portion 323 are joined by riveting the joint portion 323. Fig. 9 As shown in FIG. 2 , the base 221 is formed in a plate shape. A circular through insertion hole 221a is formed on the base 221. Figure 3 As shown, the joint portion 323 of the negative electrode terminal 320 is inserted into the insertion hole 221a of the base 221. The collector portion 222 is joined to the side portion 121a of the negative electrode 120 by, for example, ultrasonic bonding or laser welding. Fig. 9 As shown, the current collecting portion 222 is formed by bending downward from the outer edge of the base 221 in the height direction Z. The current collecting portion 222 extends orthogonally to the base 221. The current collecting portion 222 is formed integrally with the base 221. The current collecting portion 222 is bent toward the width direction Y along the outer shape of the side portion 121a of the negative electrode 120. The negative electrode current collecting plate 220 is formed of, for example, copper or a copper alloy.

[0029] The electrode terminal 300 is connected to the current collector 200 . Figures 1 to 4 , Figure 7 and Fig. 9 The illustrated electrode terminal 300 includes a positive terminal 310 and a negative terminal 320 .

[0030] like Figure 4 As shown, the positive terminal 310 is connected to the positive electrode collector plate 210. Figure 2 and Figure 7 As shown, the positive terminal 310 includes a main body 311, an insertion portion 312, and a joint portion 313. The main body 311, the insertion portion 312, and the joint portion 313 are formed as one body.

[0031] like Figure 7 As shown, the main body 311 is formed in a rectangular parallelepiped shape. Figure 2 As shown, the main body portion 311 is disposed on the base portion 611 of the positive electrode side gasket 610 .

[0032] like Figure 7 As shown in FIG. 1 , the insertion portion 312 is formed in a cylindrical shape. The insertion portion 312 is connected to the main body 311. The insertion portion 312 extends from the main body 311 to the Figure 2 and Figure 7 Extend below. Figure 2 As shown, the insertion portion 312 is inserted into the cylindrical portion 612 of the positive electrode side gasket 610. Figure 2 As shown, the insertion portion 312 is opposed to the base portion 611 and the cylindrical portion 612 of the positive electrode side gasket 610 in the longitudinal direction X and the width direction Y.

[0033] like Figure 2 As shown in FIG. 1 , the joint portion 313 is formed in a cylindrical shape. The joint portion 313 is connected to the insertion portion 312. The joint portion 313 extends from the outer periphery of the insertion portion 312 to the Figure 2 and Figure 7 Extend below. Figure 2 As shown, the joint portion 313 is opposite to the insertion hole 211a of the base portion 211 of the positive electrode collector plate 210 in the length direction X and the width direction Y. Figure 2As shown in FIG. 2 , the top end of the joint portion 313 protrudes downward from the insertion hole 211a of the base portion 211 of the positive electrode current collector plate 210. Figure 2 As shown, the top end of the joint portion 313 expands radially outward and is riveted to the bottom surface of the base 211. The top end of the joint portion 313 is welded to the base 211.

[0034] The boundary between the joint portion 313 and the insertion portion 312 in the height direction Z is not limited to Figure 2 The structure shown. Alternatively, a portion of the joint portion 313 may be opposite to the cylindrical portion 612 of the positive electrode side gasket 610 along the length direction X and the width direction Y. Alternatively, a portion of the insertion portion 312 may be opposite to the insertion hole 211a of the base portion 211 of the positive electrode collector plate 210 along the length direction X and the width direction Y.

[0035] The positive electrode terminal 310 is formed of, for example, aluminum or an aluminum alloy.

[0036] (Configuration of Negative Electrode Terminal 320 (Electrode Terminal)) The negative terminal 320 is equivalent to an electrode terminal. Figure 4 As shown, the negative terminal 320 is connected to the negative electrode collector plate 220. Figure 3 As shown, the negative terminal 320 is disposed on the negative electrode side gasket 620. Figure 3 and Fig. 9 As shown, the negative electrode terminal 320 includes a main body portion 321 , an insertion portion 322 , and a joint portion 323 .

[0037] In the negative terminal 320, the main body 321 corresponds to the second part 320Q. The insertion part 322 and the joint part 323 correspond to the first part 320P respectively. The main body 321, the insertion part 322 and the joint part 323 are formed separately. The insertion part 322 and the joint part 323 are formed integrally.

[0038] In the negative terminal 320, the first portion 320P and the second portion 320Q are joined by friction welding. That is, the insertion portion 322 and the main body portion 321 are joined by friction welding. Figure 3 As shown, through the frictional pressing of the insertion portion 322 and the main body 321, a portion of the upper surface 320a and the outer peripheral surface 320b of the insertion portion 322 is inserted into the lower surface 320c of the main body 321, and a recessed portion 320d is formed on the main body 321. That is, through the frictional pressing of the insertion portion 322 and the main body 321, a portion of the insertion portion 322 intrudes into the main body 321, forming a recessed portion 320d. Figure 3As shown, due to the frictional pressing between the insertion portion 322 and the main body 321, a cut-shaped portion 320f (protrusion) is formed on the main body 321 in a manner that annularly surrounds the outer peripheral surface 320b of the insertion portion 322. As described later, due to the frictional pressing between the insertion portion 322 and the main body 321, a raised portion 320e that annularly surrounds the outer peripheral surface 320b of the insertion portion 322 in the main body 321 is cut to form the cut-shaped portion 320f.

[0039] like Fig. 9 As shown, the main body 321 is formed in a rectangular parallelepiped shape. Figure 3 As shown, the main body 321 is disposed on the base 621 of the negative electrode side gasket 620. Figure 3 As shown, the main body 321 is exposed outside the cover 420. The outside of the cover 420 is equivalent to the outside of the battery 1. The main body 321 is connected to a bus bar or an electrical device. The bus bar is a bus bar that electrically connects the batteries 1 to each other. The electrical device is a terminal or an end bus bar that electrically connects the battery 1 to an external device. The external device is, for example, a device installed in an electric vehicle. Figure 3 As shown, the main body 321 includes a cut-shaped portion 320f protruding toward the negative-side gasket 620 at the junction with the insertion portion 322. The junction between the main body 321 and the insertion portion 322 is a portion where the recessed portion 320d of the main body 321 contacts the upper surface 320a of the insertion portion 322. The cut-shaped portion 320f surrounds the outer peripheral surface 320b of the insertion portion 322 in a ring shape along the height direction Z. The cut-shaped portion 320f contacts the negative-side gasket 620. The cut-shaped portion 320f faces Figure 3 The cylindrical portion 622 of the negative electrode side gasket 620 is compressed downward in the height direction Z shown.

[0040] like Fig. 9 As shown in FIG. 1 , the insertion portion 322 is formed in a cylindrical shape. The insertion portion 322 is joined to the main body portion 321 by friction welding. Figure 3 and Fig. 9 Extend below. Figure 3 As shown, the insertion portion 322 is inserted into the negative electrode side insertion hole 420b of the cover 420. The insertion portion 322 is inserted into the cylindrical portion 622 of the negative electrode side gasket 620. The insertion portion 322 faces the base portion 621 and the cylindrical portion 622 of the negative electrode side gasket 620 in the length direction X and the width direction Y.

[0041] like Figure 3 As shown in FIG. 1 , the joint portion 323 is formed in a cylindrical shape. The joint portion 323 is connected to the insertion portion 322. The joint portion 323 extends from the outer periphery of the insertion portion 322 to the Figure 3 and Fig. 9 Extend below. Figure 3As shown, the joint portion 323 is inserted into the negative electrode side insertion hole 420b of the cover 420. The joint portion 323 is opposite to the insertion hole 221a of the base 221 of the negative electrode collector plate 220 along the length direction X and the width direction Y. Figure 3 As shown in FIG. 2 , the top end of the joint portion 323 protrudes downward from the insertion hole 221a of the base portion 221 of the negative electrode current collector plate 220. Figure 3 As shown, the top of the joint 323 expands radially outward and is riveted to the bottom surface of the base 221. The top of the joint 323 is welded to the base 221. The joint 323 is indirectly joined to the charge-discharge body 100 through the negative electrode collector plate 220. The joint 323 can also be directly joined to the charge-discharge body 100 on the basis of changing its shape.

[0042] The boundary between the joint portion 323 and the insertion portion 322 in the height direction Z is not limited to Figure 3 The structure shown. Alternatively, a portion of the joint portion 323 may be opposite to the cylindrical portion 622 of the negative electrode side gasket 620 along the length direction X and the width direction Y. Alternatively, a portion of the insertion portion 322 may be opposite to the insertion hole 221a of the base portion 221 of the negative electrode collector plate 220 along the length direction X and the width direction Y.

[0043] In the negative terminal 320, the rigidity of the main body 321 is lower than the rigidity of the insertion portion 322 and the joint portion 323. That is, the material of the main body 321 is different from the material of the insertion portion 322 and the joint portion 323. The main body 321 is formed of a material different from that of the insertion portion 322 and the joint portion 323. The insertion portion 322 and the joint portion 323 contain copper or a copper alloy. For example, the copper alloy uses any one of the 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, and 7000 series alloys. In the tempering of the copper alloy, for example, a material subjected to any one of F, O, 1 / 4H, 1 / 2H, 3 / 4H, H, EH, and SH treatments may also be used. The main body 321 contains aluminum or an aluminum alloy. The hardness of aluminum is lower than that of copper. The aluminum alloy may be any of 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series, and 8000 series. In the tempering of the aluminum alloy, for example, a material subjected to any of F, O, H, W, and T treatments may be used.

[0044] The outer casing 400 accommodates the charging / discharging body 100 and the like. Figures 1 to 4 and Figures 7 to 10 The outer casing 400 shown includes a container 410 , a cover 420 , a cleavage valve 430 , and a sealing plug 440 .

[0045] The container 410 accommodates the charge / discharge body 100 and the like. The container 410 is formed of a rectangular metal can. The container 410 includes an opening 410a opened in the longitudinal direction and a receiving portion 410b connected to the opening 410a. The container 410 is formed of, for example, aluminum or an aluminum alloy.

[0046] The cover 420 seals the opening 410a of the container 410. The container 410 is formed of a metal plate in a long plate shape. Figure 7 As shown, a positive electrode side insertion hole 420a consisting of a circular through hole is formed on one end side of the cover 420 in the longitudinal direction X. The insertion portion 312 of the positive electrode terminal 310 and the cylindrical portion 612 of the positive electrode side gasket 610 are inserted into the positive electrode side insertion hole 420a. Fig. 9 As shown, a negative electrode side insertion hole 420b consisting of a circular through hole is formed on the other end side of the length direction X on the cover 420. The insertion portion 322 of the negative electrode terminal 320 and the barrel portion 622 of the negative electrode side gasket 620 are inserted into the negative electrode side insertion hole 420b. The cover 420 has an injection insertion hole 420c consisting of a circular through hole formed between the positive electrode side insertion hole 420a and the negative electrode side insertion hole 420b. The barrel portion 440b of the sealing plug 440 is inserted into the injection insertion hole 420c. The cover 420 is welded to the container 410. The cover 420 is formed of, for example, aluminum or an aluminum alloy.

[0047] like Figure 8 As shown, the cleavage valve 430 is provided on the cover 420. When the internal pressure of the battery 1 reaches a predetermined value, the cleavage valve 430 cleaves toward the outside of the battery, and the internal pressure of the battery 1 becomes the atmospheric pressure. The cleavage valve 430 is formed, for example, in an elliptical shape. The thickness of the cleavage valve 430 is formed to be thinner than that of the cover 420. The cleavage valve 430 is formed with a groove as a cleavage reference. The cleavage valve 430 is formed integrally with the cover 420. The cleavage valve 430 may be formed separately from the cover 420 and annularly welded to the through hole provided in the cover 420.

[0048] Sealing plug 440 seal Figure 8 The cap 420 shown in FIG. 4 has a liquid injection insertion hole 420c. The sealing plug 440 is formed in a cylindrical shape. Figure 8 As shown, the sealing plug 440 includes a head 440a with a relatively large outer diameter and a barrel 440b continuous with the head 440a and with a relatively small outer diameter. The head 440a of the sealing plug 440 is welded to the cover 420. The barrel 440b is inserted into the injection insertion hole 420c. The sealing plug 440 is formed of, for example, aluminum or an aluminum alloy.

[0049] The insulator 500 insulates the components of the battery 1 from the exterior body 400 . Figures 2 to 4 , Figure 7 and Fig. 9The insulator 500 shown includes an insulating cover 510 , a positive electrode side insulating plate 520 , and a negative electrode side insulating plate 530 .

[0050] Insulation cover 510 covers Figure 4 The charging and discharging body 100 shown in FIG. Figure 4 The upper part of the insulating cover 510 is exposed to the outside. Figure 4 The insulating cover 510 is formed in a pentahedral shape, for example, and is folded into a box shape. The insulating cover 510 is formed of, for example, polypropylene.

[0051] like Figure 2 As shown, the positive electrode side insulating plate 520 insulates the positive electrode current collector plate 210 and the cover 420. Figure 2 and Figure 7 As shown, the positive electrode side insulating plate 520 includes a rectangular plate-shaped base 521 and an edge 522 that surrounds the base 521 in an annular shape and protrudes in a direction away from the cover 420. The base 211 of the positive electrode collector plate 210 is accommodated in a space formed by the base 521 and the edge 522 of the positive electrode side insulating plate 520. A through hole 521a is formed in the base 521. The barrel 612 of the positive electrode side gasket 610 is inserted into the through hole 521a of the base 521. The positive electrode side insulating plate 520 is formed of, for example, an insulating resin.

[0052] like Figure 3 As shown, the negative electrode side insulating plate 530 insulates the negative electrode current collector plate 220 and the cover 420. Figure 3 and Fig. 9 As shown, the negative electrode side insulating plate 530 includes a rectangular plate-shaped base 531 and an edge 532 that surrounds the base 531 in an annular shape and protrudes in a direction away from the cover 420. The base 221 of the negative electrode collector plate 220 is accommodated in a space formed by the base 531 and the edge 532 of the negative electrode side insulating plate 530. A through hole 531a is formed in the base 531. The barrel 622 of the negative electrode side gasket 620 is inserted into the through hole 531a of the base 531. The negative electrode side insulating plate 530 is formed of, for example, an insulating resin.

[0053] The sealing body 600 seals the components of the battery 1 and the exterior body 400. The components of the battery 1 are, for example, the negative electrode terminal 320. Figures 1 to 4 , Figure 7 and Fig. 9 The sealing body 600 shown includes a positive electrode side gasket 610 and a negative electrode side gasket 620 .

[0054] The positive electrode side gasket 610 is compressed by the positive electrode terminal 310 and the cover 420, thereby sealing the positive electrode terminal 310 and the cover 420. Figure 7As shown, the positive electrode side gasket 610 includes a rectangular plate-shaped base 611 and a cylindrical barrel 612 protruding from the central portion of the base 611 to the inner side of the battery 1. In addition, the positive electrode side gasket 610 includes a rim 613 that surrounds the base 611 in an annular shape and protrudes to the outer side of the battery 1. A through hole is formed in the base 611. The main body 311 of the positive terminal 310 is accommodated in the space formed by the base 611 and the rim 613 of the positive electrode side gasket 610. Figure 2 As shown, the cylinder 612 is inserted into the positive electrode side insertion hole 420a of the cover 420. Figure 2 As shown, the insertion portion 312 of the positive electrode terminal 310 is inserted into the through hole of the base portion 611 and the inner peripheral surface of the cylindrical portion 612. The positive electrode side gasket 610 is formed of, for example, an insulating resin having insulating properties and elasticity.

[0055] (Configuration of Negative Electrode Side Gasket 620 (Seal Body)) The negative electrode side gasket 620 is equivalent to a sealing body. The negative electrode side gasket 620 is provided on the outer body 400. The negative electrode side gasket 620 is compressed by the negative electrode terminal 320 and the cover 420, thereby sealing the negative electrode terminal 320 and the cover 420. The outer shape of the negative electrode side gasket 620 is the same as the outer shape of the positive electrode side gasket 610. Fig. 9 As shown, the negative electrode side gasket 620 includes a rectangular plate-shaped base 621 and a cylindrical barrel 622 protruding from the central portion of the base 621 to the inner side of the battery 1. In addition, the negative electrode side gasket 620 includes an edge 623 that surrounds the base 621 in an annular shape and protrudes to the outer side of the battery 1. A through hole is formed in the base 621. The main body 321 of the negative terminal 320 is accommodated in the space formed by the base 621 and the edge 623 of the negative electrode side gasket 620. Figure 3 As shown, the cylinder 622 is inserted into the negative electrode side insertion hole 420b of the cover 420. Figure 3 As shown, the insertion portion 322 of the negative electrode terminal 320 is inserted into the through hole of the base portion 621 and the inner peripheral surface of the cylindrical portion 622. The negative electrode side gasket 620 is formed of, for example, an insulating resin having insulating properties and elasticity.

[0056] (Method of Manufacturing Negative Electrode Terminal 320) Reference Figures 10 to 13 A method for manufacturing the negative electrode terminal 320 will be described.

[0057] Fig.10 About Figure 1 A side view showing a method for manufacturing the negative electrode terminal 320 of the battery 1, wherein the first portion 320P and the second portion 320Q of the negative electrode terminal 320 are separated from each other in cross section. Fig.11 Then Fig.10 , a side view showing a state in which the first portion 320P and the second portion 320Q of the negative electrode terminal 320 are in contact with each other in cross section. Fig.12 Then Fig.11 , a side view showing a state in which a first portion 320P and a second portion 320Q of the negative electrode terminal 320 are frictionally pressed together to generate a recessed portion 320d and a raised portion 320e in cross section. Fig.13 Then Fig.12 , a side view showing a state in which a raised portion 320e of a negative electrode terminal 320 is cut to form a cut-shaped portion 320f in cross section.

[0058] like Fig.10 As shown, in the manufacturing method of the negative terminal 320, the insertion portion 322 and the joint portion 323 constituting the negative terminal 320 and the main body 321 constituting the negative terminal 320 are prepared respectively. The insertion portion 322 is held by a holding mechanism (not shown) so as to be rotatable about the height direction Z as the central axis and so as to be movable along the height direction Z. The main body 321 is held in a fixed position by a holding mechanism (not shown).

[0059] like Fig.11 As shown, in the manufacturing method of the negative terminal 320, Fig.10 The insertion portion 322 moves upward in the height direction Z and contacts the main body 321 . The upper surface 320 a of the insertion portion 322 contacts the lower surface 320 c of the main body 321 .

[0060] like Fig.12 As shown, in the manufacturing method of the negative terminal 320, Fig.11 , the insertion portion 322 and the main body 321 of the negative terminal 320 are frictionally pressed together. While the insertion portion 322 is rotated by the rotational force V, the main body 321 is pushed by the pushing force W. The insertion portion 322 is pressed by the main body 321 while rotating at a relatively high speed, and the temperature of the joint between the insertion portion 322 and the main body 321 rises. That is, friction heat is generated by rubbing the insertion portion 322 and the main body 321 at a high speed, so that the insertion portion 322 and the main body 321 are softened. The main body 321 is easier to soften than the insertion portion 322. At the same time, the insertion portion 322 is pressed against the main body 321. The main body 321 is easier to plastically deform than the insertion portion 322.

[0061] like Fig.12As shown, a portion of the upper surface 320a and the outer peripheral surface 320b of the insertion portion 322 is inserted into the lower surface 320c of the main body 321, and a recessed portion 320d is formed on the main body 321. That is, by the friction pressing between the insertion portion 322 and the main body 321, a portion of the insertion portion 322 invades the main body 321, forming the recessed portion 320d. On the main body 321, a raised portion 320e is formed in a manner of annularly surrounding the outer peripheral surface 320b of the insertion portion 322. After that, the insertion portion 322 stops rotating in a relatively short time. At the same time, the insertion portion 322 is pressed relatively strongly relative to the main body 321. That is, the insertion portion 322 is pressed relatively strongly relative to the main body 321 when the rotation stops. The temperature of the joint portion between the insertion portion 322 and the main body 321 drops. As a result, the joint portion between the insertion portion 322 and the main body 321 is fixed. The shape of the raised portion 320e is a non-linear shape.

[0062] like Fig.13 As shown, in the manufacturing method of the negative terminal 320, Fig.12 The raised portion 320e of the negative terminal 320 is partially cut to form a cut-shaped portion 320f. The outer peripheral portion of the raised portion 320e is cut, for example, by an end mill to form the cut-shaped portion 320f. The outer peripheral portion of the raised portion 320e is a portion on the side along the length direction X and the width direction Y and a portion below along the height direction. The shape of the cut-shaped portion 320f is, for example, a rectangle.

[0063] The manufacturing method of the negative terminal 320 is not limited to the configuration in which the insertion portion 322 is moved and brought into contact with the main body 321. The main body 321 may also be moved and brought into contact with the insertion portion 322. The manufacturing method of the negative terminal 320 is not limited to the configuration in which the insertion portion 322 is rotated while pressing against the main body 321, and frictionally pressing the insertion portion 322 and the joint 323. The insertion portion 322 may be held while the main body 321 is rotated while pressing against the insertion portion 322, so that the insertion portion 322 and the joint 323 are frictionally pressed. The insertion portion 322 may be rotated while the main body 321 is pressed against the insertion portion 322, so that the insertion portion 322 and the joint 323 are frictionally pressed. The insertion portion 322 may be pushed against the main body 321 while the main body 321 is rotated, so that the insertion portion 322 and the joint 323 are frictionally pressed.

[0064] (Effect of Battery 1 and Negative Terminal 320) Reference Figure 3 , Fig.12 and Fig.13 The effects of the battery 1 and the negative electrode terminal 320 will be described.

[0065] (1) The insertion portion 322 (first portion 320P) and the main body portion 321 (second portion 320Q) are joined by friction welding. The main body portion 321 includes a cut-shaped portion 320f (protrusion) at the joint portion with the insertion portion 322, and the cut-shaped portion 320f annularly surrounds the outer peripheral surface 320b of the insertion portion 322 and protrudes toward the negative-side gasket 620 (seal body). The cut-shaped portion 320f contacts the negative-side gasket 620. The protrusion may also be a raised portion 320e.

[0066] According to the battery 1 having such a configuration, the negative electrode side gasket 620 can be held by the cut-formed portion 320f of the negative electrode terminal 320 formed by friction welding. That is, the movement of the negative electrode side gasket 620 can be suppressed by the cut-formed portion 320f. Therefore, the battery 1 can improve or maintain the sealing performance between the negative electrode terminal 320 and the cover 420. As a result, the battery 1 can use the negative electrode terminal 320 formed by friction welding the insertion portion 322 and the main body 321 while improving or maintaining the sealing performance of the negative electrode side gasket 620 to the cover 420 and the negative electrode terminal 320.

[0067] (9) In the negative electrode terminal 320 , the insertion portion 322 (first portion 320P) includes copper or a copper alloy, and the main body portion 321 (second portion 320Q) includes aluminum or an aluminum alloy.

[0068] According to the battery 1 of such a configuration, the negative terminal 320 can be changed from copper to aluminum, for example. Therefore, in a battery pack having a plurality of batteries 1, the negative terminal 320 of one battery 1 and the positive terminal 310 of another battery 1 can be connected by a bus bar formed of aluminum. In this case, the positive terminal 310 formed of aluminum or an aluminum alloy is used. That is, the negative terminal 320 of one battery 1 and the positive terminal 310 of another battery 1 can be connected by an aluminum bus bar.

[0069] (Negative Electrode Terminal 330 of Modification 1 of First Embodiment) Modification 1 of the first embodiment corresponds to a specific example of the electrode terminal included in the first battery described in the means for solving the problem.

[0070] (Configuration of Negative Electrode Terminal 330) Reference Fig.14 The structure of the negative electrode terminal 330 will be described.

[0071] Fig.14 This is a side view showing a state in which a triangular cut-and-formed portion 330 f is formed in a cross section in a negative electrode terminal 330 according to Modification 1 of the first embodiment.

[0072] The cut and shaped portion 330f of the main body portion 331 (second portion 330Q) is formed by Fig.12The raised portion 320e shown is formed by cutting into an inclined shape. Fig.14 As shown, the cutting and forming portion 330f is formed in a triangular shape. The cutting and forming portion 330f contacts the outer peripheral surface 320b of the insertion portion 322. The cutting and forming portion 330f is inclined relative to the lower surface 320c of the main body 331 and the outer peripheral surface 320b of the insertion portion 322. In the cutting and forming portion 330f, the inclination angle relative to the lower surface 320c of the main body 331 is, for example, 45 degrees. In the cutting and forming portion 330f, the inclination angle relative to the lower surface 320c of the main body 331 is not limited.

[0073] (Effects of Battery 1 and Negative Terminal 330) Reference Fig.14 The effects of the battery 1 and the negative electrode terminal 330 will be described.

[0074] According to the battery 1 having such a configuration, the negative electrode side gasket 620 can be held or pressed from the main body 331 and the insertion portion 322 side by the cut and formed portion 330f inclined relative to the main body 331 and the insertion portion 322. That is, the negative electrode side gasket 620 can be held or pressed from the height direction Z and the length direction X side of the battery 1 and the height direction Z and the width direction Y side of the battery 1 by the cut and formed portion 330f. The length direction X and the width direction Y correspond to the directions intersecting the height direction Z. As a result, the negative electrode side gasket 620 can be suppressed from moving from the height direction Z of the battery 1 and the direction intersecting the height direction Z by the cut and formed portion 330f, or the negative electrode side gasket 620 can be partially compressed and pressurized. Therefore, the battery 1 can maintain or improve the sealing performance between the negative electrode terminal 330 and the cover 420.

[0075] (Negative Electrode Terminal 340 of Modification 2 of First Embodiment) Modification 2 of the first embodiment corresponds to a specific example of the electrode terminal included in the first battery described in the means for solving the problem.

[0076] (Configuration of Negative Electrode Terminal 340) Reference Fig.15 The structure of the negative electrode terminal 340 will be described.

[0077] Fig.15 This is a side view showing a state in which a rectangular cut-shaped portion 340 f which is relatively long in the longitudinal direction X and the width direction Y is formed in a negative electrode terminal 340 according to the second modification of the first embodiment.

[0078] The cut-shaped portion 340f of the main body portion 341 (second portion 340Q) is formed by Fig.12 The raised portion 320e shown is cut into a rectangular shape. Fig.15As shown, the cut-formed portion 340f is formed into a rectangle that is relatively long in the length direction X and the width direction Y compared to the height direction Z. The cut-formed portion 340f contacts the outer peripheral surface 320b of the insertion portion 322. The surface area of ​​the portion of the cut-formed portion 340f that is opposite to the negative electrode side gasket 620 in the direction intersecting the height direction Z is larger than the surface area of ​​the portion that is opposite to the negative electrode side gasket 620 in the height direction Z. The direction intersecting the height direction Z is equivalent to the length direction X and the width direction Y. The cut-formed portion 340f may also be a trapezoidal shape that is inclined relative to the lower surface 320c of the main body 341 or the outer peripheral surface 320b of the insertion portion 322.

[0079] (Effect of Battery 1 and Negative Terminal 340) Reference Fig.15 The effects of the battery 1 and the negative electrode terminal 340 will be described.

[0080] According to the battery 1 having such a structure, the negative electrode side gasket 620 can be held in a relatively wide range by cutting the shaped portion 340f, particularly in the portion facing the height direction Z of the battery 1, that is, the portion along the length direction X and the width direction Y.

[0081] (Negative Electrode Terminal 350 of Modification 3 of First Embodiment) Modification 3 of the first embodiment corresponds to a specific example of the electrode terminal included in the first battery described in the means for solving the problem.

[0082] (Configuration of Negative Electrode Terminal 350) Reference Fig.16 The structure of the negative electrode terminal 350 will be described.

[0083] Fig.16 This is a side view showing a state in which a relatively long rectangular cut-shaped portion 350 f is formed in the height direction Z in a negative electrode terminal 350 according to the third modification of the first embodiment.

[0084] The cut and formed portion 350f of the main body portion 351 (second portion 350Q) is Fig.12 The raised portion 320e shown is cut into a rectangular shape. Fig.16As shown, the cut-formed portion 350f is formed into a rectangular shape that is relatively long in the height direction Z compared to the length direction X and the width direction Y. The cut-formed portion 350f is in contact with the outer peripheral surface 320b of the insertion portion 322. The surface area of ​​the portion of the cut-formed portion 350f that faces the negative electrode side gasket 620 in the height direction Z is larger than the surface area of ​​the portion that faces the negative electrode side gasket 620 in the direction intersecting the height direction Z. The direction intersecting the height direction Z is equivalent to the length direction X and the width direction Y. The cut-formed portion 350f may also be a trapezoidal shape that is inclined relative to the lower surface 320c of the main body 351 or the outer peripheral surface 320b of the insertion portion 322.

[0085] (Effect of Battery 1 and Negative Terminal 350) Reference Fig.16 The effects of the battery 1 and the negative electrode terminal 350 will be described.

[0086] According to the battery 1 having such a configuration, the negative electrode side gasket 620 can be held in a relatively wide range, particularly in the portion along the height direction Z of the battery 1 , by cutting and forming the portion 350 f .

[0087] (Negative Electrode Terminal 360 of Modification 4 of First Embodiment) Modification 4 of the first embodiment corresponds to a specific example of the electrode terminal included in the second battery described in the means for solving the problem.

[0088] (Constitution of negative terminal 360) Reference Fig.17 The structure of the negative electrode terminal 360 will be described.

[0089] Fig.17 This is a side view showing a state in which a flat surface portion 360r is formed without forming a cut-shaped portion in a negative electrode terminal 360 according to Modification 4 of the first embodiment, with the protrusion removed.

[0090] The main body 361 (second part) includes a planar portion 360r that is cut in a portion adjacent to a joining portion between the main body 361 and the insertion portion 322 (first part). Fig.13 In the manufacturing method of the negative terminal 320 shown in the figure, the plane portion 360r is formed by cutting away all the raised portion 320e of the negative terminal 320. The plane portion 360r is continuous with the lower surface 360c of the main body 361 in the length direction X and the width direction Y. The plane portion 360r constitutes a part of the lower surface 360c. A cutting mark formed by an end mill or the like is formed on the plane portion 360r. That is, on the lower surface 360c of the main body 361, the plane portion 360r is formed by an annular cutting mark in a manner of surrounding the outer peripheral surface 320b of the insertion portion 322.

[0091] (Effect of battery 1 and negative terminal 360) Reference Fig.17 The effects of the battery 1 and the negative electrode terminal 360 will be described.

[0092] (2) The main body portion 361 (second portion) includes the cut flat surface portion 360r in a portion adjacent to the joining portion between the main body portion 361 and the insertion portion 322 (first portion).

[0093] According to the battery 1 having such a configuration, the negative electrode side gasket 620 can be held by the flat surface portion 360r of the negative electrode terminal 360 formed by cutting after friction welding. That is, the movement of the negative electrode side gasket 620 can be suppressed by the flat surface portion 360r. Therefore, the battery 1 can maintain the sealing performance between the negative electrode terminal 360 and the cover 420. As a result, the battery 1 can use the negative electrode terminal 360 formed by friction welding the insertion portion 322 and the main body portion 361 while maintaining the sealing performance of the negative electrode side gasket 620 to the cover 420 and the negative electrode terminal 360.

[0094] (Negative Electrode Terminal 370 of Modification 5 of First Embodiment) Modification 5 of the first embodiment corresponds to a specific example of the electrode terminal included in the first battery described in the means for solving the problem.

[0095] (Configuration of Negative Electrode Terminal 370) Reference Fig.18 and Fig.19 The structure of the negative electrode terminal 370 will be described.

[0096] Fig.18 This is a side view showing a cross-section of a negative electrode terminal 370 according to Modification 5 of the first embodiment before friction welding. Fig.19 This is a side view showing a cross-section of a negative electrode terminal 370 according to Modification 5 of the first embodiment after friction welding.

[0097] The negative electrode terminal 370 includes a main body portion 371 (second portion 370Q), an insertion portion 372 (first portion 370P), and a joint portion 323 (first portion 370P). Fig.18 As shown, the insertion portion 372 includes an inclined surface 370g at the boundary portion between the upper surface 370a and the outer peripheral surface 370b. The inclined surface 370g is inclined relative to the upper surface 370a and the outer peripheral surface 370b of the insertion portion 372. The inclined surface 370g is formed in an annular shape relative to the insertion portion 372 with the height direction Z as the central axis.

[0098] like Fig.19As shown, in the negative terminal 370, the insertion portion 372 and the main body 371 are joined by friction pressing. Through the friction pressing of the insertion portion 372 and the main body 371, the upper surface 370a and the inclined surface 370g of the insertion portion 372 are inserted into the lower surface 320c of the main body 371, and a recessed portion 370d is formed on the main body 371. That is, as the insertion portion 372 and the main body 371 are friction pressed, a part of the insertion portion 372 invades the main body 371, forming the recessed portion 370d. Fig.19 As shown, due to the frictional pressure contact between the insertion portion 372 and the main body 371, a raised portion 370e (protrusion) is formed on the main body 371 in a manner that annularly surrounds the outer peripheral surface 370b of the insertion portion 372. The raised portion 370e can also be formed by cutting like the cut-formed portion 320f of the negative terminal 320.

[0099] (Effect of Battery 1 and Negative Terminal 370) Reference Fig.19 The effects of the battery 1 and the negative electrode terminal 370 will be described.

[0100] According to the battery 1 having such a configuration, the size of the raised portion 370e can be regulated by the inclined surface 370g of the insertion portion 372. That is, the larger the shape of the inclined surface 370g of the insertion portion 372 is, the smaller the size of the raised portion 370e is.

[0101] (Battery 2 of Second Embodiment) The battery 2 of the second embodiment corresponds to a specific example of the third battery described in the means for solving the problems. Fig. 20 The battery 2 is shown having a negative terminal 380 .

[0102] (Configuration of Negative Electrode Terminal 380) Reference Fig. 20 The structure of the negative electrode terminal 380 will be described.

[0103] Fig. 20 It is a side view showing the components around the negative electrode terminal 380 of the battery 2 according to the second embodiment in cross section.

[0104] The negative electrode terminal 380 includes a first portion 380P and a second portion 320Q. The first portion 380P includes an insertion portion 382 and a joint portion 383. The insertion portion 382 and the joint portion 383 are integrally formed along the height direction Z.

[0105] like Fig. 20 As shown, the insertion portion 382 includes a first shaft portion 380i and a second shaft portion 380j.

[0106] The first shaft portion 380i is formed into a cylindrical shape along the height direction Z. The first shaft portion 380i is joined to the main body portion 321 by friction welding. The first shaft portion 380i is a portion where the first outer peripheral surface 380b1 exists. The shape of the first outer peripheral surface 380b1 of the first shaft portion 380i along the length direction X and the width direction Y is larger than the outer peripheral surface 320b of the insertion portion 322 of the negative terminal 320. The positional relationship of the first shaft portion 380i and the main body portion 321 along the length direction X and the width direction Y is inconsistent. That is, the central axis S2 of the first shaft portion 380i is inconsistent with the central axis S1 of the main body portion 321. The central axis S2 is the center of the surface formed by the length direction X and the width direction Y of the first shaft portion 380i. The central axis S1 is the center of the surface formed by the length direction X and the width direction Y of the main body portion 321. Due to the frictional pressure between the first shaft portion 380i and the main body 321, a raised portion 320e is formed on the main body 321 to surround the outer peripheral surface 380b of the first shaft portion 380i in an annular shape. The raised portion 320e can also be formed by cutting like the cut-formed portion 320f of the negative terminal 320.

[0107] like Fig. 20 As shown, the second shaft portion 380j is connected to the first shaft portion 380i along the height direction Z. The second shaft portion 380j is formed in a cylindrical shape along the height direction Z. The second shaft portion 380j is a portion where the second outer peripheral surface 380b2 exists. The shape of the second shaft portion 380j along the length direction X and the width direction Y is smaller than that of the first shaft portion 380i. The shape of the second outer peripheral surface 380b2 of the second shaft portion 380j of the negative terminal 380 along the length direction X and the width direction Y is the same as the outer peripheral surface 320b of the insertion portion 322 of the negative terminal 320. The positional relationship of the second shaft portion 380j and the main body portion 321 along the length direction X and the width direction Y is consistent. That is, the central axis S1 of the second shaft portion 380j is consistent with the central axis S1 of the main body portion 321. The central axis S1 is the center of the surface formed by the length direction X and the width direction Y of the second shaft portion 380j, and the center of the surface formed by the length direction X and the width direction Y of the main body portion 321. The second outer peripheral surface 380 b 2 of the insertion portion 382 faces the base portion 621 and the cylindrical portion 622 of the negative electrode side gasket 620 in the longitudinal direction X and the width direction Y.

[0108] like Fig. 20 and Figure 3 As shown, the shape of the second outer peripheral surface 380b2 of the joint portion 383 along the length direction X and the width direction Y is the same as the outer peripheral surface 320b of the joint portion 323 of the negative terminal 320. Fig. 20As shown in FIG. 1 , the central axis S2 of the inner circumferential surface 380h of the joint 383 along the height direction Z is not consistent with the central axis S2 of the second outer circumferential surface 380b2 of the joint 383 along the height direction Z. Therefore, the shape of the joint 383 is different along the circumferential direction with the height direction Z as the central axis. Fig. 20 As shown, the inner circumferential surface 380h and the second outer circumferential surface 380b2 of the joint 383 have different thicknesses along the circumferential direction. The second outer circumferential surface 380b2 of the joint 383 faces the insertion hole 221a of the base 221 of the negative electrode collector plate 220 along the length direction X and the width direction Y.

[0109] (Method of Manufacturing Negative Electrode Terminal 380) Reference Figure 21 to Figure 26 A method for manufacturing the negative electrode terminal 380 will be described.

[0110] Fig.21 About Fig. 20 A side view of a method for manufacturing a negative terminal 380 of a battery 2, showing a state in which a central axis S2 of a first portion 380P and a central axis S1 of a second portion 320Q of the negative terminal 380 are relatively aligned and the first portion 380P and the second portion 320Q are in contact with each other. Fig. 22 The display is shown with the cross section removed. Fig.21 A bottom view of the negative terminal 380. Fig.23 Then Fig.21 and Fig. 22 , a side view showing a state in which the central axis S2 of the first portion 380P and the central axis S1 of the second portion 320Q are not relatively aligned after the first portion 380P and the second portion 320Q of the negative terminal 380 are frictionally pressed together. Fig.24 The display is shown with the cross section removed. Fig.23 A bottom view of the negative terminal 380. Fig.25 Then Fig.23 and Fig.24 , a side view showing a state in which the outer peripheral surface 380b of the first portion 380P of the negative terminal 380 is cut so that the central axis S2 of the first portion 380P and the central axis S1 of the second portion 320Q are relatively aligned with each other. Fig.26 The display is shown with the cross section removed. Fig.25 A bottom view of the negative terminal 380.

[0111] like Fig.21 and Fig. 22 As shown in FIG. 1 , in the manufacturing method of the negative terminal 380 , the insertion portion 382 moves in the height direction Z and contacts the main body 321 . The upper surface 380 a of the insertion portion 382 contacts the lower surface 320 c of the main body 321 . Fig.21 and Fig. 22As shown, the central axis S2 of the insertion portion 382 of the negative electrode terminal 380 and the central axis S1 of the main body portion 321 are relatively aligned.

[0112] like Fig.23 and Fig.24 As shown, in the manufacturing method of the negative terminal 380, Fig.21 and Fig. 22 , so that the insertion portion 382 of the negative terminal 320 is frictionally pressed into contact with the main body 321. While the insertion portion 382 is rotated by the rotational force V, the main body 321 is pushed by the pushing force W. A portion of the upper surface 380a and the outer peripheral surface 380b of the insertion portion 382 are inserted into the lower surface 320c of the main body 321, forming a recessed portion 320d on the main body 321. On the main body 321, a raised portion 320e is formed in a manner that annularly surrounds the outer peripheral surface 380b of the insertion portion 382. The central axis S2 of the insertion portion 382 and the central axis S1 of the main body 321 are relatively inconsistent. The reason is that when the insertion portion 382 and the main body 321 are frictionally pressed into contact, the insertion portion 382 is relatively misaligned relative to the main body 321 in the length direction X and the width direction Y.

[0113] like Fig.25 and Fig.26 As shown, in the manufacturing method of the negative terminal 380, Fig.23 and Fig.24 , the outer peripheral surface 380b of the insertion portion 382 is cut to form a second outer peripheral surface 380b2. The second outer peripheral surface 380b2 is formed by cutting the outer peripheral surface 380b except near the main body 321. The second outer peripheral surface 380b2 is formed by cutting the outer peripheral surface 380b with the center axis S1 as a reference. In the insertion portion 382, ​​the portion where the second outer peripheral surface 380b2 is formed corresponds to the second shaft portion 380j. In the outer peripheral surface 380b of the insertion portion 382, ​​the portion near the main body 321 is referred to as the first outer peripheral surface 380b1. That is, the portion of the outer peripheral surface 380b of the insertion portion 382 where the second outer peripheral surface 380b2 is not formed is referred to as the first outer peripheral surface 380b1. In the insertion portion 382, ​​the portion where the first outer peripheral surface 380b1 is formed corresponds to the first shaft portion 380i.

[0114] (Effect of battery 2 and negative terminal 380) Reference Fig. 20 , Fig.25 and Fig.26 The effects of the battery 2 and the negative electrode terminal 380 will be described.

[0115] (3) The insertion portion 382 (first portion 380P) includes: a first shaft portion 380i, which is joined to the main body portion 321 (second portion 320Q); and a second shaft portion 380j, which is connected to the first shaft portion 380i and has a shape smaller than the first shaft portion 380i along a direction intersecting the stacking direction of the second shaft portion 380j and the first shaft portion 380i.

[0116] According to the battery 2 having such a configuration, the relative positional deviation between the insertion portion 382 and the main body 321 of the negative electrode terminal 380 joined by friction welding can be resolved by cutting the outer peripheral surface 380b of the insertion portion 382 to form the second shaft portion 380j.

[0117] (Battery 3 of Modification 1 of Second Embodiment) The battery 3 of the modification 1 of the second embodiment corresponds to a specific example of the fourth battery described in the means for solving the problem. Fig. 27 The battery 3 shown has a negative electrode terminal 390 and a negative electrode side gasket 630 .

[0118] (Configuration of Negative Electrode Terminal 390) Reference Fig. 27 The structure of the negative electrode terminal 390 will be described.

[0119] Fig. 27 It is a side view showing the components around the negative electrode terminal 390 of the battery 3 according to the first modification of the second embodiment in cross section.

[0120] like Fig. 27 As shown, the negative electrode side gasket 630 (sealing body) includes a base 621 and a barrel 622. The negative electrode side gasket 630 does not include a rim 623. The negative electrode side gasket 630 may include a rim that surrounds the base 621 in an annular manner and protrudes toward the outside of the battery 3. In this case, the rim is separated from the main body 321 in the length direction X and the width direction Y.

[0121] like Fig. 27 As shown, the negative terminal 390 includes an insertion portion 322 (first portion 320P), a joint portion 323 (first portion 320P), and a main body portion 321 (second portion 320Q). The central axis S2 of the insertion portion 322 coincides with the central axis S2 of the joint portion 323. The central axis S2 of the insertion portion 322 and the central axis S1 of the main body portion 321 do not coincide with each other.

[0122] The portion of the main body 321 exposed outside the cover 420 contacts the base 621 of the negative electrode side gasket 630 along the stacking direction with the insertion portion 322. The stacking direction corresponds to the height direction Z. The portion of the main body 321 exposed outside the cover 420 does not contact the negative electrode side gasket 630 along the direction intersecting the stacking direction. The direction intersecting the stacking direction corresponds to the length direction X and the width direction Y.

[0123] (Method of Manufacturing Negative Electrode Terminal 390) Reference Figure 28 to Figure 31 A method for manufacturing the negative electrode terminal 390 will be described.

[0124] Fig.28 About Fig. 27 A side view of a method for manufacturing a negative terminal 390 of a battery 3, showing a state in which a central axis S2 of a first portion 320P and a central axis S1 of a second portion 320Q of the negative terminal 390 are relatively aligned and the first portion 320P and the second portion 320Q are in contact with each other. Fig.29 The display is shown with the cross section removed. Fig.28 A bottom view of the negative terminal 390. Fig.30 Then Fig.28 and Fig.29 , a side view showing a state in which the central axis S2 of the first portion 320P and the central axis S1 of the second portion 320Q are not relatively aligned after the first portion 320P and the second portion 320Q of the negative terminal 390 are frictionally pressed together. Fig.31 The display is shown with the cross section removed. Fig.30 A bottom view of the negative terminal 390.

[0125] like Fig.28 and Fig.29 As shown, in the manufacturing method of the negative terminal 390, the insertion portion 322 moves along the height direction Z and contacts the main body 321. The upper surface 320a of the insertion portion 322 contacts the lower surface 320c of the main body 321. The central axis S2 of the insertion portion 322 of the negative terminal 390 and the central axis S1 of the main body 321 are relatively consistent.

[0126] like Fig.30 and Fig.31 As shown, in the manufacturing method of the negative terminal 390, Fig.28 and Fig.29 , so that the insertion portion 322 of the negative terminal 390 is frictionally pressed against the main body 321. While the insertion portion 322 is rotated by the rotational force V, the main body 321 is pushed by the pushing force W. The upper surface 320a and a part of the outer peripheral surface 320b of the insertion portion 322 are inserted into the lower surface 320c of the main body 321, and a recessed portion 320d is formed on the main body 321. On the main body 321, a raised portion 320e is formed in a manner that annularly surrounds the outer peripheral surface 320b of the insertion portion 322. The central axis S2 of the insertion portion 322 and the central axis S1 of the main body 321 are relatively inconsistent. The reason is that when the insertion portion 322 and the main body 321 are frictionally pressed, the insertion portion 322 is relatively offset relative to the main body 321 along the length direction X and the width direction Y.

[0127] (Effect of Battery 3 and Negative Terminal 390) Reference Fig. 27 , Fig.30 and Fig.31 The effects of the battery 3 and the negative electrode terminal 390 will be described.

[0128] (4) The main body 321 (second portion) of the negative terminal 390, in the portion exposed from the outside of the negative electrode side gasket 630 (external body), contacts the negative electrode side gasket 630 along the stacking direction with the insertion portion 322, but does not contact the negative electrode side gasket 630 along the direction intersecting the stacking direction.

[0129] According to the battery 3 having such a structure, relative positional deviation between the insertion portion 322 of the negative electrode terminal 390 and the main body 321 joined by friction welding can be solved by preventing the main body 321 and the negative electrode side gasket 630 from interfering in the longitudinal direction X and the width direction Y.

[0130] (Battery 4 of the Third Embodiment) The battery 4 of the third embodiment corresponds to a specific example of the fifth battery described in the means for solving the problems. Fig.32 The battery 4 is shown having a negative terminal 710 .

[0131] (Configuration of Negative Electrode Terminal 710) Reference Fig.32 The structure of the negative electrode terminal 710 will be described.

[0132] Fig.32 It is a side view showing the components around the negative electrode terminal 710 of the battery 4 according to the third embodiment in cross section.

[0133] like Fig.32 As shown, the negative terminal 710 includes a first portion 710P and a second portion 710Q.

[0134] like Fig.32 As shown, the first portion 710P includes an insertion portion 712 and a joint portion 323. The insertion portion 712 is relatively shorter in length in the height direction Z than the insertion portion 322 of the negative electrode terminal 320.

[0135] like Fig.32 As shown, the second portion 710Q includes a main body portion 711. The main body portion 711 includes a convex portion 710k that partially protrudes toward the first portion 710P. Fig.32 As shown, the convex portion 710 k protrudes downward in the height direction Z from the main body portion 711 .

[0136] The convex portion 710k is joined to the insertion portion 712 by friction pressing. The bottom surface 710m of the convex portion 710k is joined to the upper surface 710a of the insertion portion 712. The convex portion 710k includes a raised portion 710e (protrusion). The raised portion 710e is raised in a manner of annularly surrounding the outer peripheral surface 710n of the convex portion 710k due to the friction pressing between the insertion portion 712 and the convex portion 710k. The raised portion 710e protrudes from the outer peripheral surface 710n of the convex portion 710k. The raised portion 710e protrudes toward the negative side gasket 620 in a direction intersecting the stacking direction of the first portion 710P and the second portion 710Q. The direction intersecting the stacking direction is equivalent to the length direction X and the width direction Y intersecting the height direction Z. The raised portion 710e is in contact with the upper surface 710a of the insertion portion 712.

[0137] The raised portion 710e overlaps with the insertion portion 712 along the height direction Z. The raised portion 710e does not protrude from the insertion portion 712 along the length direction X and the width direction Y. That is, the raised portion 710e does not protrude radially outward from the outer peripheral surface 710b of the insertion portion 712 along the length direction X and the width direction Y. The raised portion 710e may be formed by cutting in the same manner as the cut-formed portion 320f of the negative terminal 320.

[0138] At the junction between the upper surface 710a of the insertion portion 712 and the bottom surface 710m of the protrusion 710k, the surface area of ​​the upper surface 710a is larger than the surface area of ​​the bottom surface 710m excluding the protrusion 710e. In addition, the surface area of ​​the upper surface 710a is larger than the surface area of ​​the lower surface 710m including the protrusion 710e.

[0139] (Method of Manufacturing Negative Electrode Terminal 710) Reference Fig.33 and Fig.34 A method for manufacturing the negative electrode terminal 710 will be described.

[0140] Fig.33 About Fig.32 A side view showing a method of manufacturing a negative electrode terminal 710, and showing a state in which a first portion 710P and a second portion 710Q of a negative electrode terminal 710 are in contact with each other in cross section. Fig.34 Then Fig.33 , a side view showing a state in which a first portion 710P and a second portion 710Q of a negative electrode terminal 710 are frictionally pressed together to generate a raised portion 710e in cross section.

[0141] like Fig.33 As shown, in the method of manufacturing the negative electrode terminal 710, the insertion portion 712 moves in the height direction Z and contacts the convex portion 710k of the main body 711. The upper surface 710a of the insertion portion 712 contacts the bottom surface 710m of the convex portion 710k.

[0142] like Fig.34 As shown, in the manufacturing method of the negative terminal 710, Fig.33 , so that the insertion portion 712 of the negative terminal 710 and the convex portion 710k of the main body 711 are frictionally pressed together. While the insertion portion 712 is rotated by the rotational force V, the main body 711 is pushed by the pushing force W. Through the frictional pressing between the insertion portion 712 and the main body 711, the bottom surface 710m of the convex portion 710k moves toward the main body 711 side. On the convex portion 710k, a raised portion 710e is formed in a manner that annularly surrounds the outer peripheral surface 710n of the convex portion 710k. The raised portion 710e protrudes toward the negative side gasket 620 in the length direction X and the width direction Y that intersect the height direction Z. The raised portion 710e contacts the upper surface 710a of the insertion portion 712.

[0143] (Effects of Battery 4 and Negative Terminal 710) Reference Fig.32 and Fig.34 The effects of the battery 4 and the negative electrode terminal 710 will be described.

[0144] (5) The main body 711 (second part 710Q) includes a convex portion 710k that partially protrudes toward the insertion portion 712 (first part 710P). The insertion portion 712 and the convex portion 710k are joined by friction welding. The convex portion 710k includes a raised portion 710e (protrusion) that protrudes toward the negative side gasket 620 (sealing body) in a direction intersecting the stacking direction of the insertion portion 712 and the main body 711. In the joining portion between the insertion portion 712 and the convex portion 710k, the surface area of ​​the upper surface 710a of the insertion portion 712 is larger than the surface area of ​​the bottom surface 710m of the convex portion 710k excluding the convex portion 710e. In particular, in an embodiment, the surface area of ​​the upper surface 710a of the insertion portion 712 is larger than the surface area of ​​the bottom surface 710m of the convex portion 710k including the convex portion 710e.

[0145] According to the battery 4 having such a configuration, interference between the raised portion 710e of the negative terminal 710 formed by friction welding and the negative-side gasket 620 can be prevented. Therefore, the battery 4 can maintain the sealing performance between the negative terminal 710 and the cover 420. As a result, the battery 4 can use the negative terminal 710 formed by friction welding the insertion portion 712 and the main body 711 while maintaining the sealing performance of the negative-side gasket 620 to the cover 420 and the negative terminal 710.

[0146] (Battery 5 of Modification 1 of Third Embodiment) The battery 5 of the modification 1 of the third embodiment corresponds to a specific example of the seventh battery described in the means for solving the problems. Fig.35 The battery 5 is shown having a negative terminal 720 .

[0147] (Configuration of Negative Electrode Terminal 720) Reference Fig.35 The structure of the negative electrode terminal 720 will be described.

[0148] Fig.35 It is a side view showing the components around the negative electrode terminal 720 of the battery 5 according to the first modification of the third embodiment in cross section.

[0149] like Fig.35 As shown, the negative terminal 720 includes a first portion 710P and a second portion 720Q.

[0150] like Fig.35 As shown, the second portion 720Q includes a main body 721. The main body 721 is similar to Fig.32 The structure of the main body 711 shown in FIG. Fig.32 The raised portion 710e shown is large. The raised portion 720e exceeds the outer peripheral surface 710b of the insertion portion 712 and protrudes in the length direction X and the width direction Y. That is, at the junction of the upper surface 710a of the insertion portion 712 and the bottom surface 710m of the convex portion 710k, the surface area of ​​the upper surface 710a is larger than the surface area of ​​the bottom surface 710m excluding the raised portion 720e. On the other hand, the surface area of ​​the upper surface 710a is smaller than the surface area of ​​the bottom surface 710m including the raised portion 720e. The raised portion 720e can also be formed by cutting like the cut-formed portion 320f of the negative terminal 320.

[0151] like Fig.35 As shown, the negative electrode side gasket 640 (sealing body) includes a base 621, a barrel 642 and an edge 623. The barrel 642 includes a concave recessed portion 642a. The recessed portion 642a is formed in a concave shape from a portion adjacent to the base 621 toward the bottom of the height direction Z. The recessed portion 642a is opposite to the convex portion 710k along the length direction X and the width direction Y. The recessed portion 642a is opposite to the raised portion 720e along the length direction X and the width direction Y. The raised portion 720e is inserted into the recessed portion 642a. The top end of the raised portion 720e contacts the bottom surface of the recessed portion 642a. The top end of the raised portion 720e presses the bottom surface of the recessed portion 642a to deform it.

[0152] (Effects of Battery 5 and Negative Terminal 720) Reference Fig.35 The effects of the battery 5 and the negative electrode terminal 720 will be described.

[0153] (7) The main body 721 (second part 720Q) includes a convex portion 710k that partially protrudes toward the insertion portion 712 (first part 710P). The insertion portion 712 and the convex portion 710k are joined by friction welding. The convex portion 710k includes a raised portion 720e (protrusion) that protrudes toward the negative side gasket 640 (sealing body) in a direction intersecting the stacking direction of the insertion portion 712 and the main body 721. The negative side gasket 640 includes a concave recessed portion 642a at a portion opposite to the raised portion 720e. The raised portion 720e is inserted into the recessed portion 642a.

[0154] According to the battery 5 having such a configuration, the negative electrode side gasket 640 can be held or pressed by the raised portion 720e while preventing excessive interference between the raised portion 720e of the negative electrode terminal 720 formed by frictional compression and the negative electrode side gasket 640 by the recessed portion 642a of the negative electrode side gasket 640. Therefore, the battery 5 can maintain the sealing performance between the negative electrode terminal 720 and the cover 420. As a result, the battery 5 can use the negative electrode terminal 720 formed by frictionally compression-bonding the insertion portion 712 and the main body 721 while maintaining the sealing performance of the negative electrode side gasket 640 to the cover 420 and the negative electrode terminal 720.

[0155] (Battery 6 of Modification 2 of Third Embodiment) The battery 6 of the second modification of the third embodiment corresponds to a specific example of the seventh battery described in the means for solving the problems. Fig.36 The illustrated battery 6 has a negative terminal 720 and a negative-side gasket 650 .

[0156] (Configuration of Negative Electrode Terminal 720) Reference Fig.36 The structure of the negative electrode terminal 720 will be described.

[0157] Fig.36 It is a side view showing the components around the negative electrode terminal 720 of the battery 6 according to the second modification of the third embodiment in cross section.

[0158] like Fig.36As shown, the negative electrode side gasket 650 (sealing body) includes a base 621, a barrel 652 and an edge 623. The barrel 652 includes a concave recessed portion 652a. The recessed portion 652a is formed in a concave shape from the portion adjacent to the base 621 toward the bottom of the height direction Z. The recessed portion 652a of the barrel 652 is longer than the recessed portion 642a of the barrel 642 along the height direction Z. The recessed portion 652a is opposite to the convex portion 710k along the length direction X and the width direction Y. The recessed portion 652a is opposite to the raised portion 720e along the length direction X and the width direction Y. The raised portion 720e is inserted into the recessed portion 652a. The raised portion 720e is separated from the recessed portion 652a. The top of the raised portion 720e does not contact the side and bottom surfaces of the recessed portion 652a.

[0159] (Effect of Battery 6 and Negative Terminal 720) Reference Fig.36 The effects of the battery 6 and the negative electrode terminal 720 will be described.

[0160] (7) The main body 711 (second part 720Q) includes a convex portion 710k that partially protrudes toward the insertion portion 712 (first part 710P). The insertion portion 712 and the convex portion 710k are joined by friction welding. The convex portion 710k includes a raised portion 720e (protrusion) that protrudes toward the negative side gasket 650 (sealing body) in a direction intersecting the joining direction of the insertion portion 712 and the main body 711. The raised portion 720e is in contact with the negative side gasket 650 (sealing body). The negative side gasket 650 includes a concave recessed portion 652a in a portion opposite to the raised portion 720e. The raised portion 720e is inserted into the recessed portion 652a. In this embodiment, the raised portion 720e does not contact the recessed portion 652a.

[0161] According to the battery 6 having such a configuration, interference between the raised portion 720e of the negative terminal 720 formed by friction welding and the negative-side gasket 650 can be prevented. Therefore, the battery 6 can maintain the sealing performance between the negative terminal 720 and the cover 420. As a result, the battery 6 can use the negative terminal 720 formed by friction welding the insertion portion 712 and the main body 711 while maintaining the sealing performance of the negative-side gasket 650 between the cover 420 and the negative terminal 720.

[0162] (Battery 7 of Modification 3 of Third Embodiment) The battery 7 according to the modification 3 of the third embodiment corresponds to a specific example of the sixth battery described in the means for solving the problems. Fig.37 The battery 7 shown has a negative terminal 730 .

[0163] (Configuration of Negative Electrode Terminal 730) Reference Fig.37 The structure of the negative electrode terminal 730 will be described.

[0164] Fig.37 It is a side view showing the components around the negative electrode terminal 730 of the battery 7 according to the third modification of the third embodiment in cross section.

[0165] like Fig.37 As shown, the negative terminal 730 includes a first portion 710P and a second portion 730Q.

[0166] The second portion 730Q includes a cutting and forming portion 730f. The cutting and forming portion 730f is formed by partially cutting the raised portion 720e of the second portion 720Q. The cutting and forming portion 730f is formed by partially cutting and forming the raised portion 720e in a manner continuous with the outer peripheral surface 710b of the insertion portion 712 along the height direction Z. The cutting and forming portion 730f overlaps with the insertion portion 712 along the height direction Z. The cutting and forming portion 730f is connected to the insertion portion 712 along the height direction Z. The cutting and forming portion 730f does not extend radially outward from the outer peripheral surface 710b of the insertion portion 712 along the length direction X and the width direction Y.

[0167] (Effects of Battery 7 and Negative Terminal 730) Reference Fig.37 The effects of the battery 7 and the negative electrode terminal 730 will be described.

[0168] (6) The main body 731 (second part 730Q) includes a convex portion 710k that partially protrudes toward the insertion portion 712 (first part 710P). The insertion portion 712 and the convex portion 710k are joined by friction welding. The convex portion 710k includes a cut-shaped portion 730f (protrusion) that protrudes toward the negative-side gasket 620 (sealing body) in a direction intersecting the stacking direction of the insertion portion 712 and the main body 731. The cut-shaped portion 730f (protrusion) contacts the negative-side gasket 620.

[0169] According to the battery 7 having such a configuration, the negative electrode side gasket 620 can be held by the cut-formed portion 730f of the negative electrode terminal 730 formed by the cutting process after friction welding. That is, the movement of the negative electrode side gasket 620 can be suppressed by the cut-formed portion 730f. Therefore, the battery 7 can maintain the sealing performance between the negative electrode terminal 730 and the cover 420. As a result, the battery 7 can use the negative electrode terminal 730 formed by friction welding the insertion portion 712 and the main body 731 while maintaining the sealing performance of the negative electrode side gasket 620 to the cover 420 and the negative electrode terminal 730.

[0170] (Battery 8 of Fourth Embodiment) The fourth embodiment corresponds to a specific example of the seventh battery described in the means for solving the problem. Fig.38 The battery 8 is shown having a negative terminal 810 .

[0171] (Configuration of Negative Electrode Terminal 810 (Electrode Terminal)) Reference Fig.38 The structure of the negative electrode terminal 810 will be described.

[0172] Fig.38 It is a side view showing the components around the negative electrode terminal 810 of the battery 8 according to the fourth embodiment in cross section.

[0173] In the negative terminal 810, the insertion portion 712 (first portion 710P) and the protrusion 810k of the main body portion 811 (second portion 810Q) are joined by friction welding. Fig.38 As shown, the convex portion 810k partially protrudes from the lower surface 810c of the main body 811 toward the insertion portion 712. Figure 3 As shown, the convex portion 810k protrudes downward from the main body 811 in the height direction Z. The surface area of ​​the upper surface 710a of the insertion portion 712 is equal to the surface area of ​​the bottom surface 810m of the convex portion 810k. The upper surface 710a of the insertion portion 712 and the bottom surface 810m of the convex portion 810k overlap in the height direction Z. That is, the insertion portion 712 and the convex portion 810k are formed into a cylindrical shape.

[0174] like Fig.38 As shown, by frictionally pressing the insertion portion 712 and the convex portion 810k, a raised portion 810e (protrusion) is formed on the main body 811 in a manner that annularly surrounds the outer peripheral surface 710b of the insertion portion 712. The raised portion 810e protrudes downward from the outer peripheral surface 710n of the convex portion 810k in the height direction Z. The raised portion 810e can also be formed by cutting and forming the cut-formed portion in the same manner as the cut-formed portion 320f of the negative terminal 320.

[0175] like Fig.38 As shown, the negative electrode side gasket 660 (sealing body) includes a base 621, a barrel 662 and a rim 623. The barrel 662 includes a concave recessed portion 662a. The recessed portion 662a is formed into a concave shape from a portion adjacent to the base 621 toward the bottom of the height direction Z. The recessed portion 662a is opposite to the convex portion 810k along the length direction X and the width direction Y. The recessed portion 662a is opposite to the raised portion 810e along the length direction X and the width direction Y. The raised portion 810e is inserted into the recessed portion 662a. The top of the raised portion 810e contacts the bottom surface of the recessed portion 662a. The top of the raised portion 810e presses the bottom surface of the recessed portion 662a to deform it.

[0176] (Method for Manufacturing Negative Electrode Terminal 810) Reference Fig.39 and Fig.40 A method for manufacturing the negative electrode terminal 810 will be described.

[0177] Fig.39 About Fig.38 A side view showing a method for manufacturing a negative electrode terminal 810, and showing a state in which a first portion 710P and a second portion 810Q of a negative electrode terminal 810 are in contact with each other in cross section. Fig.40 Then Fig.39 , a side view showing a state in which a first portion 710P and a second portion 810Q of a negative electrode terminal 810 are frictionally pressed together to generate a raised portion 810e in cross section.

[0178] like Fig.39 As shown, in the method of manufacturing the negative terminal 810, the insertion portion 712 moves in the height direction Z and contacts the convex portion 810k of the main body 811. The upper surface 710a of the insertion portion 712 contacts the bottom surface 810m of the convex portion 810k.

[0179] like Fig.40 As shown, in the manufacturing method of the negative terminal 810, Fig.39 , the insertion portion 712 of the negative terminal 810 and the convex portion 810k of the main body 811 are frictionally pressed together. While the insertion portion 712 is rotated by the rotational force V, the main body 811 is pushed by the pushing force W. Due to the melting accompanied by the friction pressing of the insertion portion 712 and the main body 811, the bottom surface 810m of the convex portion 810k moves toward the main body 811 side. A raised portion 810e is formed on the convex portion 810k in a manner that annularly surrounds the outer peripheral surface 710b of the insertion portion 712. The raised portion 810e protrudes toward the negative side gasket 660 in the length direction X and the width direction Y intersecting the height direction Z. The raised portion 810e protrudes downward in the height direction Z along the outer peripheral surface 710b of the insertion portion 712.

[0180] (Effects of Battery 8 and Negative Terminal 810) Reference Fig.38 and Fig.40 The effects of the battery 8 and the negative electrode terminal 810 will be described.

[0181] (7) The insertion portion 712 (first portion 710P) and the convex portion 810k are joined by friction welding. The convex portion 810k includes a raised portion 810e (protrusion) that protrudes toward the negative side gasket 660 (sealing body) in a direction intersecting the stacking direction of the insertion portion 712 and the main body 811 (second portion 810Q). The direction intersecting the stacking direction corresponds to the length direction X and the width direction Y. The negative side gasket 660 includes a concave recessed portion 662a in a portion opposite to the raised portion 810e. The raised portion 810e is inserted into the recessed portion 662a.

[0182] According to the battery 8 having such a configuration, the negative electrode side gasket 660 can be held or pressed by the raised portion 810e while preventing excessive interference between the raised portion 810e of the negative electrode terminal 810 formed by friction welding and the negative electrode side gasket 660 by the recessed portion 662a. Therefore, the battery 8 can maintain the sealing performance between the negative electrode terminal 810 and the cover 420. As a result, the battery 8 can use the negative electrode terminal 810 formed by friction welding the insertion portion 712 and the main body 811 while maintaining the sealing performance of the negative electrode side gasket 660 to the cover 420 and the negative electrode terminal 810.

[0183] (Battery 9 of Modification 1 of Fourth Embodiment) The battery 9 according to the first modification of the fourth embodiment corresponds to a specific example of the seventh battery described in the means for solving the problems. Fig.41 The illustrated battery 9 has a negative electrode terminal 810 and a negative electrode side gasket 670 .

[0184] (Configuration of Negative Electrode Terminal 810) Reference Fig.41 The structure of the negative electrode terminal 810 will be described.

[0185] Fig.41 It is a side view showing the components around the negative electrode terminal 810 of the battery 9 according to the first modification of the fourth embodiment in cross section.

[0186] like Fig.41 As shown, the negative electrode side gasket 670 (sealing body) includes a base 621, a barrel 672 and an edge 623. The barrel 672 includes a concave recessed portion 672a. The recessed portion 672a is formed into a concave shape from the portion adjacent to the base 621 toward the bottom of the height direction Z. The recessed portion 672a of the barrel 672 is longer than the recessed portion 662a of the barrel 662 along the height direction Z. The recessed portion 672a is opposite to the convex portion 810k along the length direction X and the width direction Y. The recessed portion 672a is opposite to the raised portion 810e along the length direction X and the width direction Y. The raised portion 810e is inserted into the recessed portion 672a. The raised portion 810e is separated from the recessed portion 672a. The top of the raised portion 810e does not contact the side and bottom surfaces of the recessed portion 672a.

[0187] (Effects of Battery 9 and Negative Terminal 810) Reference Fig.41 The effects of the battery 9 and the negative electrode terminal 810 will be described.

[0188] (7) The main body 721 (second part 720Q) includes a convex portion 810k that partially protrudes toward the insertion portion 712 (first part 710P). The insertion portion 712 and the convex portion 810k are joined by friction welding. The convex portion 810k includes a raised portion 810e (protrusion) that protrudes toward the negative side gasket 670 (sealing body) in a direction intersecting the joining direction of the insertion portion 712 and the main body 721. The raised portion 810e is in contact with the negative side gasket 670 (sealing body). The negative side gasket 670 includes a concave recessed portion 672a in a portion opposite to the raised portion 810e. The raised portion 810e is inserted into the recessed portion 672a.

[0189] According to the battery 9 having such a configuration, interference between the raised portion 810e of the negative terminal 810 formed by friction welding and the negative-side gasket 670 can be prevented. Therefore, the battery 9 can maintain the sealing performance between the negative terminal 810 and the cover 420. As a result, the battery 9 can use the negative terminal 810 formed by friction welding the insertion portion 712 and the main body 721 while maintaining the sealing performance of the negative-side gasket 670 to the cover 420 and the negative terminal 810.

[0190] (Battery 10 of Modification 2 of Fourth Embodiment) The battery 10 according to the second modification of the fourth embodiment corresponds to a specific example of the eighth battery described in the means for solving the problems. Fig.42 The battery 10 is shown having a negative terminal 820 .

[0191] (Configuration of Negative Electrode Terminal 820) Reference Fig.42 The structure of the negative electrode terminal 820 will be described.

[0192] Fig.42 It is a side view showing the components around the negative electrode terminal 820 of the battery 10 according to the second modification of the fourth embodiment in cross section.

[0193] The main body 821 (second part) includes a planar portion 810r that is cut in a portion adjacent to the joining portion between the main body 821 and the insertion portion 712 (first part). The convex portion 810k includes a planar portion 810r that is cut along the stacking direction of the convex portion 810k and the insertion portion 712 in a portion adjacent to the joining portion between the convex portion 810k and the insertion portion 712. Fig.13In the manufacturing method of the negative terminal 320 shown, the plane portion 810r is formed by cutting away the raised portion 320e of the negative terminal 320. The plane portion 810r is continuous with the lower surface 360c of the main body 821 along the length direction X and the width direction Y. A cutting mark formed by an end mill or the like is formed on the plane portion 810r. That is, the plane portion 810r is composed of an annular cutting mark in a manner of surrounding the outer peripheral surface 810n of the convex portion 810k. The plane portion 810r is opposite to the negative side gasket 620 (sealing body) in the length direction X and the width direction Y. The plane portion 810r is in contact with the barrel 622.

[0194] (Effects of Battery 10 and Negative Electrode Terminal 820) Reference Fig.42 The effects of the battery 10 and the negative electrode terminal 820 will be described.

[0195] (8) The protrusion 810k of the insertion portion 712 (first portion) and the main body 821 (second portion) are joined by friction welding. The protrusion 810k includes a plane portion 810r that is cut along the stacking direction of the protrusion 810k and the insertion portion 712 in a portion adjacent to the joining portion between the protrusion 810k and the insertion portion 712. The joining portion is equivalent to the portion where the bottom surface 810m of the protrusion 810k contacts the upper surface 710a of the insertion portion 712. The stacking direction is equivalent to the height direction Z. The plane portion 810r is opposite to the negative electrode side gasket 620 (sealing body) in a direction intersecting the stacking direction. The direction intersecting the stacking direction is equivalent to the direction along the length direction X and the width direction Y.

[0196] According to the battery 10 of such a configuration, the negative electrode side gasket 620 can be held by the flat surface portion 810r of the negative electrode terminal 820 formed by cutting after friction welding. That is, the movement of the negative electrode side gasket 620 can be suppressed by the flat surface portion 810r. Therefore, the battery 10 can maintain the sealing performance between the negative electrode terminal 820 and the cover 420. As a result, the battery 10 can use the negative electrode terminal 820 formed by friction welding the insertion portion 712 and the main body 821 while maintaining the sealing performance of the negative electrode side gasket 620 to the cover 420 and the negative electrode terminal 820.

[0197] (Battery 11 of the Fifth Embodiment) The fifth embodiment corresponds to a specific example of the first battery described in the means for solving the problem. Fig.43 The battery 11 is shown having a negative terminal 910 .

[0198] (Configuration of Negative Electrode Terminal 910 (Electrode Terminal)) Reference Fig.43 The structure of the negative electrode terminal 910 will be described.

[0199] Fig.43It is a side view showing the components around the negative electrode terminal 910 of the battery 11 according to the fifth embodiment in cross section.

[0200] In the negative terminal 910, the insertion portion 912 (first portion 910P) and the protrusion 910k of the main body portion 911 (second portion 910Q) are joined by friction welding. Fig.43 As shown in FIG. 1 , the convex portion 910k partially protrudes from the lower surface 910c of the main body portion 911 toward the insertion portion 912. Fig.43 As shown, the convex portion 910k protrudes downward from the main body portion 911 in the height direction Z. The surface area of ​​the upper surface 910a of the insertion portion 912 is smaller than the surface area of ​​the lower surface 910m of the convex portion 910k.

[0201] like Fig.43 As shown, through the frictional pressing of the insertion portion 912 and the convex portion 910k, a portion of the upper surface 910a and the outer peripheral surface 910b of the insertion portion 912 is inserted into the lower surface 910m of the convex portion 910k, and a recessed portion 910d is formed on the convex portion 910k. That is, through the frictional pressing of the insertion portion 912 and the convex portion 910k, a portion of the insertion portion 912 invades the convex portion 910k, forming a recessed portion 910d. Fig.43 As shown, due to the frictional pressure contact between the insertion portion 912 and the main body 911, a raised portion 910e (protrusion) is formed on the main body 911 in a manner that annularly surrounds the outer peripheral surface 910b of the insertion portion 912. The raised portion 910e protrudes downward in the height direction Z. The raised portion 910e can also be formed by cutting in the same manner as the cut-formed portion 320f of the negative terminal 320.

[0202] (Effects of Battery 11 and Negative Electrode Terminal 910) Reference Fig.43 The effects of the battery 11 and the negative electrode terminal 910 will be described.

[0203] (1) The insertion portion 912 (first portion 910P) and the convex portion 910k of the main body 911 (second portion 910Q) are joined by friction welding. The surface area of ​​the upper surface 910a of the insertion portion 912 is smaller than the surface area of ​​the lower surface 910m of the convex portion 910k. The main body 911 includes a raised portion 910e (protrusion) at the joint portion between it and the insertion portion 912, and the raised portion 910e annularly surrounds the outer peripheral surface 910b of the insertion portion 912 and protrudes toward the negative side gasket 620 (sealing body). The raised portion 910e is in contact with the negative side gasket 620.

[0204] According to the battery 11 having such a configuration, the negative electrode side gasket 620 can be held by the cut-formed portion 910f of the negative electrode terminal 910 formed by friction welding. That is, the movement of the negative electrode side gasket 620 can be suppressed by the cut-formed portion 910f. Therefore, the battery 11 can improve or maintain the sealing performance between the negative electrode terminal 910 and the cover 420. As a result, the battery 11 can use the negative electrode terminal 910 formed by friction welding the insertion portion 912 and the main body 911 while improving or maintaining the sealing performance of the negative electrode side gasket 620 to the cover 420 and the negative electrode terminal 910.

[0205] (Battery 12 of Sixth Embodiment) The sixth embodiment corresponds to a specific example of the ninth battery described in the means for solving the problems. Fig.44 The battery 12 is shown having a positive terminal 1010 .

[0206] (Configuration of Positive Electrode Terminal 1010 (Electrode Terminal)) Reference Fig.44 The structure of the positive electrode terminal 1010 will be described.

[0207] Fig.44 It is a side view showing the components around the positive electrode terminal 1010 of the battery 12 according to the sixth embodiment in cross section.

[0208] The positive terminal 1010 is equivalent to the electrode terminal. Fig.44 As shown, the positive terminal 1010 is connected to the positive electrode collector plate 210. Fig.44 As shown, the positive terminal 1010 is disposed on the positive electrode side gasket 610. Fig.44 As shown, the positive electrode terminal 1010 includes a main body portion 1011 , an insertion portion 1012 , and a joint portion 1013 .

[0209] In the positive terminal 1010, the main body 1011 corresponds to the second part 1010Q. The insertion part 1012 and the joint part 1013 correspond to the first part 1010P. The main body 1011, the insertion part 1012 and the joint part 1013 are formed separately. The insertion part 1012 and the joint part 1013 are formed integrally.

[0210] In the positive terminal 1010, the first part 1010P and the second part 1010Q are joined by friction welding. That is, the insertion part 1012 and the main body 1011 are joined by friction welding. In the joint portion between the insertion part 1012 and the main body 1011, the surface area of ​​the upper surface 1010a of the insertion part 1012 is smaller than the surface area of ​​the lower surface 1010c of the main body 1011. Fig.44As shown, due to the frictional pressing between the insertion portion 1012 and the main body 1011, a cut-shaped portion 1010f (protrusion) is formed on the insertion portion 1012 in a manner that annularly surrounds the outer peripheral surface 1010b of the insertion portion 1012. Due to the frictional pressing between the insertion portion 1012 and the main body 1011, a raised portion that rises in the insertion portion 1012 in a manner that annularly surrounds the outer peripheral surface 1010b of the insertion portion 1012 is cut to form the cut-shaped portion 1010f. The positive terminal 1010 is not limited to the cut raised portion.

[0211] like Fig.44 As shown in FIG. 1 , the main body 1011 is formed in a rectangular parallelepiped shape. Fig.44 As shown, the main body 1011 is disposed on the base 611 of the positive electrode side gasket 610. Fig.44 As shown, the main body 1011 is exposed outside the cover 420. The outside of the cover 420 is equivalent to the outside of the battery 12. The main body 1011 is connected to a bus bar or an electrical device. The bus bar is a bus bar that electrically connects the batteries 12 to each other. The electrical device is a terminal or an end bus bar that electrically connects the battery 12 and an external device. The external device is, for example, a device installed in an electric vehicle. Fig.44 As shown, the insertion portion 1012 includes a cut-formed portion 1010f protruding toward the positive electrode side gasket 610 in a direction intersecting the stacking direction of the insertion portion 1012 and the main body portion 1011. The direction intersecting the stacking direction corresponds to the length direction X and the width direction Y. The joining portion between the main body portion 1011 and the insertion portion 1012 is a portion where the lower surface 1010c of the main body portion 1011 and the upper surface 1010a of the insertion portion 1012 are in contact. The cut-formed portion 1010f surrounds the outer peripheral surface 1010b of the insertion portion 1012 in a ring shape along the height direction Z. The cut-formed portion 1010f is in contact with the positive electrode side gasket 610. The cut-formed portion 1010f is directed toward Fig.44 The cylindrical portion 612 of the positive electrode side gasket 610 is compressed downward in the height direction Z shown.

[0212] like Fig.44 As shown in FIG. 1 , the insertion portion 1012 is formed into a cylindrical shape. The insertion portion 1012 is joined to the main body 1011 by friction welding. Fig.44 Extend below. Fig.44 As shown, the insertion portion 1012 is inserted into the positive electrode side insertion hole 420a of the cover 420. The insertion portion 1012 is inserted into the barrel portion 612 of the positive electrode side gasket 610. The insertion portion 1012 faces the base portion 611 and the barrel portion 612 of the positive electrode side gasket 610 in the length direction X and the width direction Y.

[0213] like Fig.44As shown in FIG. 1 , the joint 1013 is formed into a cylindrical shape. The joint 1013 is connected to the insertion portion 1012. The joint 1013 extends from the outer periphery of the insertion portion 1012 to the Fig.44 Extend below. Fig.44 As shown, the joint 1013 is inserted into the positive electrode side insertion hole 420a of the cover 420. The joint 1013 is opposite to the insertion hole 211a of the base 211 of the positive electrode collector plate 210 along the length direction X and the width direction Y. Fig.44 As shown in FIG. 1 , the top end of the joint 1013 protrudes downward from the insertion hole 211a of the base 211 of the positive electrode current collector plate 210. Fig.44 As shown, the top of the joint 1013 expands radially outward and is riveted to the bottom surface of the base 211. The top of the joint 1013 is welded to the base 211. The joint 1013 is indirectly joined to the charge-discharge body 100 through the positive electrode collector plate 210. The joint 1013 can also be directly joined to the charge-discharge body 100.

[0214] The boundary between the joint portion 1013 and the insertion portion 1012 in the height direction Z is not limited to Fig.44 The structure shown. Alternatively, a portion of the joint portion 1013 may be opposite to the cylindrical portion 612 of the positive electrode side gasket 610 along the length direction X and the width direction Y. Alternatively, a portion of the insertion portion 1012 may be opposite to the insertion hole 211a of the base portion 211 of the positive electrode collector plate 210 along the length direction X and the width direction Y.

[0215] In positive terminal 1010, main body 1011 has higher rigidity than insertion portion 1012 and joint portion 1013. Main body 1011 is formed of a material different from that of insertion portion 1012 and joint portion 1013. Insertion portion 1012 and joint portion 1013 include aluminum or aluminum alloy. Main body 1011 includes copper or copper alloy.

[0216] (Effects of Battery 12 and Positive Terminal 1010) Reference Fig.44 The effects of the battery 12 and the positive electrode terminal 1010 will be described.

[0217] (10) The insertion portion 1012 (first portion 1010P) and the main body portion 1011 (second portion 1010Q) are joined by friction welding. The main body portion 1011 of the positive terminal 1010 has a higher rigidity than the insertion portion 1012. The insertion portion 1012 of the positive terminal 1010 includes a cut-shaped portion 1010f (protrusion) at the joint portion with the main body portion 1011, which protrudes toward the positive side gasket 610 (seal) in a direction intersecting the stacking direction of the insertion portion 1012 and the main body portion 1011.

[0218] According to the battery 12 having such a configuration, the positive electrode side gasket 610 can be held by the cut and formed portion 1010f of the positive electrode terminal 1010 formed by friction welding. That is, the movement of the positive electrode side gasket 610 can be suppressed by the cut and formed portion 1010f. Therefore, the battery 12 can maintain the sealing between the positive electrode terminal 1010 and the cover 420. As a result, the battery 12 can use the positive electrode terminal 1010 formed by friction welding the insertion portion 1012 and the main body 1011 while maintaining the sealing between the cover 420 and the positive electrode terminal 1010 by the positive electrode side gasket 610.

[0219] (11) In the positive electrode terminal 1010 , the insertion portion 1012 (first portion 1010P) includes aluminum or an aluminum alloy, and the main body portion 1011 (second portion 1010Q) includes copper or a copper alloy.

[0220] According to the battery 12 of such a configuration, the positive terminal 1010 can be converted from aluminum to copper, for example. Therefore, in a battery pack having a plurality of batteries 12, the positive terminal 1010 of one battery 12 and the negative terminal of another battery 12 can be connected by a busbar formed of, for example, copper. In this case, the negative terminal is formed of copper or a copper alloy. That is, the positive terminal 1010 of one battery 12 and the negative terminal of another battery 12 can be connected by a copper busbar. In this case, the negative terminal of the other battery 12 is not converted from copper to aluminum, but is made of copper or a copper alloy.

[0221] According to the battery 12 of such a configuration, the end busbar on the high voltage side of the battery pack can be formed of copper. That is, the end busbar on the low voltage side and the end busbar on the high voltage side of the battery pack can be formed of copper. Therefore, on the electric vehicle or hybrid vehicle side equipped with the battery pack, the end busbars on the high voltage side and the low voltage side can be aligned using copper.

[0222] (Battery of Other Embodiments) The battery of the present invention is not limited to the configuration of the battery described in the embodiments, and can be appropriately configured based on the contents described in the claims.

[0223] The embodiments are described in detail or briefly for the purpose of easily understanding the present invention, and do not necessarily need to include all the structures described, or may include structures not shown. In addition, a part of the structure of the embodiments may be deleted, replaced with the structure of other embodiments, or combined with the structure of other embodiments.

[0224] The negative electrode terminal may be configured by arbitrarily combining the embodiments. For example, a negative electrode terminal may be configured by combining the negative electrode terminal 710 of the third embodiment and the negative electrode terminal 380 of the second embodiment.

[0225] The configurations of the negative electrode terminal in each of the embodiments and modifications other than the first embodiment can also be applied to the configuration of the positive electrode terminal.

[0226] The battery 1 is not limited to being a power source for a hybrid electric vehicle (HEV), for example. The battery 1 may be configured as a power source for an electric vehicle (BEV). The battery 1 may be configured as a power source for a mounted vehicle.

[0227] The battery of the present invention is not limited to lithium-ion batteries. The battery of the present invention can be applied to nickel-hydrogen batteries or lead batteries, for example. The battery of the present invention is not limited to secondary batteries. The battery of the present invention can be applied to primary batteries. The charging and discharging body of the battery of the present invention is not limited to a winding type charging and discharging body in which the positive electrode, separator and negative electrode, which are respectively formed into long strips, are bundled and wound. In the charging and discharging body of the battery of the present invention, a stacked type in which a plurality of positive electrodes, separators and negative electrodes, which are respectively formed into rectangular shapes, are alternately stacked can be applied. In the charging and discharging body of the battery of the present invention, a stacked type in which a plurality of positive electrodes and a plurality of negative electrodes formed into relatively short strips are opposite and alternately arranged with a separator separated from a piece of separator formed into a long strip can be applied. In the charging and discharging body thus constructed, the positive electrode and the negative electrode are opposite to each other with a separator separated by a folding manner. The battery of the present invention is not limited to a configuration in which one charging and discharging body is provided. The battery of the present invention can be applied to a configuration in which two or more charging and discharging bodies are provided. The battery of the present invention is not limited to a configuration in which the charging and discharging body is sealed by a container and a cover. The battery of the present invention can be applied to a configuration in which the charging and discharging body is sealed with a laminated film. Explanation of symbols

[0228] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 battery, 100 charging and discharging body, 110 positive electrode, 120 negative electrode, 130 separator, 140 electrolyte, 200 collector, 210 positive electrode collector plate, 211 base, 211a insertion hole, 212 collector part, 220 negative electrode collector plate, 221 base, 221a insertion hole, 222 collector part, 300 electrode terminal, 310 positive terminal (electrode terminal), 311 main body (second part), 312 insertion part (first part), 313 joint part (first part), 320 negative terminal (electrode terminal), 320P first part, 320Q second part, 320a upper surface, 320b outer peripheral surface, 320c lower surface, 320d recessed part, 320e raised portion (protrusion), 320f cut-formed portion (protrusion), 321 main body (second portion), 322 insertion portion (first portion), 323 joint portion (first portion), 330 negative terminal (electrode terminal), 330Q second portion, 330f cut-formed portion (protrusion), 331 main body (second portion), 340 negative terminal (electrode terminal), 340Q second portion, 340f cut-formed portion (protrusion), 341 main body (second portion), 350 negative terminal (electrode terminal), 350Q second portion, 350f cut-formed portion (protrusion), 351 main body (second portion), 360 negative terminal (electrode terminal), 360c lower surface, 360r flat portion, 361 main body (second portion) 370 negative electrode terminal (electrode terminal), 370P first part, 370Q second part, 370a upper surface, 370b outer peripheral surface, 370d recessed part, 370e raised part (protruding part), 370g inclined surface, 371 main body (second part), 372 insertion part (first part), 380 negative electrode terminal (electrode terminal), 380P first part, 380a upper surface, 380b outer peripheral surface, 380b1 first outer peripheral surface, 380b2 second outer peripheral surface, 380h inner peripheral surface, 380i first shaft part, 380j second shaft part, 382 insertion part (first part), 383 joint part (first part) 390 negative electrode terminal (electrode terminal), 400 outer body, 410 container, 420 cover, 420a positive electrode side insertion part 420b negative electrode side insertion hole (through hole), 420c injection insertion hole, 430 cleavage valve, 440 sealing plug, 500 insulator, 510 insulating cover, 520 positive electrode side insulating plate, 521 base, 521a through hole, 522 edge, 530 negative electrode side insulating plate, 531 base, 531a through hole, 532 edge, 600 sealing body, 610 positive electrode side gasket (sealing body), 611 base, 612 barrel, 613 edge, 620 negative electrode side gasket (sealing body), 621 base, 622 barrel, 623 edge, 630 negative electrode side gasket (sealing body), 640 negative electrode side gasket (sealing body), 642 barrel, 642a recessed portion, 650 negative electrode side gasket (sealing body),652 barrel, 652a recessed portion, 660 negative electrode side gasket (seal), 662 barrel, 662a recessed portion, 670 negative electrode side gasket (seal), 672 barrel, 672a recessed portion, 710 negative electrode terminal (electrode terminal), 710P first portion, 710Q second portion, 710a upper surface, 710b outer peripheral surface, 710e raised portion (protrusion), 710k convex portion, 710m bottom surface, 710n outer peripheral surface, 711 main body (second portion), 712 insertion portion (first portion), 720 negative electrode terminal (electrode terminal), 720Q second portion, 720b outer peripheral surface, 720e raised portion (protrusion), 721 main body portion (second portion), 730 negative electrode terminal (electrode terminal), 730Q second portion, 730f cutting and forming portion (protrusion), 810 negative electrode terminal (electrode terminal), 810Q second portion, 810a upper surface, 810b outer peripheral surface, 810c lower surface, 810e raised portion (protrusion), 8 10k convex portion, 810m bottom surface, 810n outer peripheral surface, 810r flat portion, 811 main body (second portion), 812 insertion portion (first portion), 820 negative terminal (electrode terminal), 821 main body (second portion) 910 negative terminal (electrode terminal), 910P first portion, 910Q second portion, 910a upper surface, 910b outer peripheral surface, 910c lower surface, 910d recessed portion, 910e raised portion (protrusion), 910f cut-out portion (protrusion) 910k convex portion, 910m lower surface, 911 main body (second portion), 912 insertion portion (first portion), 1010 positive terminal (electrode terminal), 1010P first portion, 1010Q second portion, 1010a upper surface, 1010b outer peripheral surface, 1010c lower surface, 1010f cutting forming portion (protrusion), 1011 main body (second portion), 1012 insertion portion (first portion), 1013 joint portion (first portion), S1 central axis, S2 center axis, V rotation force, W pressing force, X (battery 1) length direction, Y (battery 1) width direction, Z (battery 1) height direction.

Claims

1. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer casing, has lower rigidity than the first part, and is joined to a bus bar or an electrical device, The first part and the second part are joined by friction welding, The second part includes a protrusion protruding toward the sealing body along the outer circumference of the first part at a portion where the second part is joined to the first part. The protrusion is in contact with the sealing body.

2. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer casing, has lower rigidity than the first part, and is joined to a bus bar or an electrical device, The first part and the second part are joined by friction welding, The second portion includes a planar portion that is cut in a portion adjacent to a joining portion between the second portion and the first portion.

3. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: a first part, which is inserted into the through hole of the outer casing and is indirectly or directly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer casing, has lower rigidity than the first part, and is connected to a bus bar or an electrical device, The first part and the second part are joined by friction welding, The first part includes: a first shaft portion engaged with the second portion; The second shaft portion is connected to the first shaft portion and has a shape smaller than the first shaft portion in a direction intersecting a stacking direction of the second shaft portion and the first shaft portion.

4. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer casing, has lower rigidity than the first part, and is joined to a bus bar or an electrical device, The first part and the second part are joined by friction welding, The portion of the second portion exposed outside the outer body is in contact with the sealing body along the stacking direction of the second portion and the first portion, but is not in contact with the sealing body along a direction intersecting the stacking direction.

5. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part including a convex part partially protruding toward the first part, exposed to the outside of the outer casing, having lower rigidity than the first part, and being joined to a busbar or an electrical device, The first portion and the convex portion are joined by friction welding, The convex portion includes a protrusion that protrudes toward the sealing body in a direction intersecting with a stacking direction of the first portion and the second portion. At a joining portion between the first portion and the convex portion, a surface area of ​​the first portion is larger than a surface area of ​​the convex portion excluding the protruding portion.

6. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part including a convex part partially protruding toward the first part, exposed to the outside of the outer casing, having lower rigidity than the first part, and being joined to a busbar or an electrical device, The first portion and the convex portion are joined by friction welding, The convex portion includes a protrusion that protrudes toward the sealing body in a direction intersecting with a stacking direction of the first portion and the second portion. The protrusion is in contact with the sealing body.

7. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part including a convex part partially protruding toward the first part, exposed to the outside of the outer casing, having lower rigidity than the first part, and being joined to a busbar or an electrical device, The first portion and the convex portion are joined by friction welding, The convex portion includes a protrusion that protrudes toward the sealing body in a direction intersecting with a stacking direction of the first portion and the second portion. The sealing body includes a concave recessed portion at a portion opposite to the protruding portion, The protrusion is inserted into the recess.

8. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part including a convex part partially protruding toward the first part, exposed to the outside of the outer casing, having lower rigidity than the first part, and being joined to a busbar or an electrical device, The first portion and the convex portion are joined by friction welding, The convex portion includes a flat surface portion cut along a stacking direction of the convex portion and the first portion at a portion adjacent to a joining portion of the convex portion and the first portion. The planar portion and the sealing body are opposed to each other in a direction intersecting the stacking direction.

9. The battery according to any one of claims 1 to 8, characterized in that The first part comprises copper or a copper alloy, The second part comprises aluminum or an aluminum alloy, The electrode terminal is a negative electrode terminal.

10. A battery, characterized in that: The battery has: Charge and discharge body; An outer casing, which accommodates the charging and discharging body and is formed with a through hole; A sealing body, which is arranged on the outer body; as well as an electrode terminal disposed on the sealing body, The electrode terminal comprises: A first part, which is inserted into the through hole of the outer body and is directly or indirectly connected to the charging and discharging body; and a second part, which is exposed to the outside of the outer casing, has higher rigidity than the first part, and is connected to a busbar or an electrical device, The first part and the second part are joined by friction welding, The second part includes a protrusion protruding toward the sealing body along the outer circumference of the first part at a portion where the second part is joined to the first part. The protrusion is in contact with the sealing body.

11. The battery according to claim 10, characterized in that The first part comprises aluminum or an aluminum alloy, The second part comprises copper or a copper alloy, The electrode terminal is a positive terminal.

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