Electrode terminal and battery

Abstract

An electrode terminal (negative electrode 420) has a first member (421) containing a first metal (copper or a copper alloy) electrically connected to a charge / discharge body (100) of a battery (1), and a second member (422) containing a first metal (copper or a copper alloy) having a first insertion portion (422x) into which the first member (421) is inserted and bonded to the first member (421). And a third member (423) having a second insertion portion (423x) into which the first member (421) is inserted, joined to the second member (422), and containing a second metal (aluminum or aluminum alloy) made of a material different from that of the first metal (copper or copper alloy). The third member (423) is bonded to a conductive member (bus bar 10) on a facing surface (P) of the conductive member (bus bar 10) that electrically connects one battery (1) to another battery (1) and contains a second metal (aluminum or an aluminum alloy). The first member (421) and the third member (423) are adjacent to each other on the facing surface (P) side.

Description

Technical Field

[0001] The present invention relates to an electrode terminal and a battery. Background Art

[0002] Conventionally, there is known a technique for changing the material of the electrode terminal of a battery (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5656592 Summary of the invention

[0006] Problems to be solved by the invention

[0007] There is a demand for improved properties of battery electrode terminals whose materials have been changed.

[0008] Means for solving problems

[0009] The electrode terminal includes a first component, a second component, and a third component. The first component is electrically connected to the charging and discharging body of the battery and contains a first metal. The second component includes a first insertion portion into which the first component is inserted, is bonded to the first component, and contains the first metal. The third component includes a second insertion portion into which the first component is inserted, is bonded to the second component, and contains a second metal of a material different from the first metal. The third component is bonded to the conductive component on the opposite surface to the conductive component that electrically connects one battery to another battery and contains the second metal. The first component and the third component are adjacent to each other on one side of the opposite surface.

[0010] The battery includes the electrode terminal described above and a charging and discharging body electrically connected to the electrode terminal.

[0011] The electrode terminal has a first component, a second component, and a third component. The first component is electrically connected to the charging and discharging body of the battery and contains a first metal. The second component is joined to the first component and contains the first metal. The third component is joined to the second component and contains a second metal of a different material from the first metal. The third component is not riveted to the first component. The third component is joined to the conductive component on the opposite surface to the conductive component that electrically connects one battery to other batteries and contains the second metal. The first component, the second component, and the third component are adjacent to each other on one side of the opposite surface.

[0012] The electrode terminal includes a first component, a second component, and a third component. The first component is electrically connected to the charging and discharging body of the battery and contains a first metal. The second component is joined to the first component and contains the first metal. The third component is joined to the second component and contains a second metal of a material different from the first metal. The third component is joined to the conductive component on the opposite surface to the conductive component that electrically connects one battery to another battery and contains the second metal. The first component does not protrude toward the conductive component side compared to the third component on the opposite surface side. The third component is joined to the conductive component across the first component.

[0013] Effects of the Invention

[0014] Changing the material of the battery electrode terminal can improve the characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view showing the battery 1 according to the first embodiment.

[0016] Figure 2 It is a perspective view showing the components around the negative electrode terminal 420 of the battery 1 in cross section.

[0017] Figure 3 Yes means Figure 2 A side view of the components.

[0018] Figure 4 It is a perspective view showing the components around the positive electrode terminal 410 of the battery 1 in cross section.

[0019] Figure 5 Yes means Figure 4 A side view of the components.

[0020] Figure 6 It is a perspective view showing the battery 1 in a partially exploded state.

[0021] Figure 7 It is a perspective view showing the charging and discharging body 100 of the battery 1 .

[0022] Figure 8 It is shown in cross section Figure 7 1 is a side view of a portion of the charge-discharge body 100.

[0023] Fig. 9 This is a side view showing a part of a charging and discharging body 1100 according to a modified example in cross section.

[0024] Fig.10 It is a perspective view showing the components around the negative electrode terminal 420 of the battery 1 in an exploded manner.

[0025] Fig.11It is a perspective view showing the components around the cleavage valve 530 and the sealing plug 540 of the battery 1 in an exploded manner.

[0026] Fig.12 It is a perspective view showing the components around the positive electrode terminal 410 of the battery 1 in an exploded manner.

[0027] Fig.13 It is a perspective view showing a cross section of the negative electrode terminal 420 according to the first embodiment.

[0028] Fig.14 is shown in exploded form Fig.13 A three-dimensional view of the negative terminal 420.

[0029] Fig.15 It is a perspective view showing the connection between a plurality of batteries 1 and a bus bar 10 .

[0030] Fig.16 It is an end view showing the negative electrode terminal 420 and the bus bar 10 according to the first embodiment.

[0031] Fig.17 It is an end view showing the negative electrode terminal 430 and the bus bar 10 according to the second embodiment.

[0032] Fig.18 It is an end view showing a negative electrode terminal 440 and a bus bar 10 according to the third embodiment.

[0033] Fig.19 It is an end view showing a negative electrode terminal 450 and a bus bar 10 according to the fourth embodiment.

[0034] Fig. 20 It is an end view showing a negative electrode terminal 460 and a bus bar 20 according to the fifth embodiment.

[0035] Fig.21 It is an end view showing a negative electrode terminal 470 and a bus bar 10 according to the sixth embodiment.

[0036] Fig. 22 It is an end view showing a negative electrode terminal 480 and a bus bar 10 according to the seventh embodiment.

[0037] Fig.23 It is a perspective view showing a negative electrode terminal 490A according to the eighth embodiment in cross section.

[0038] Fig.24 is shown in exploded form Fig.23 A three-dimensional view of the negative terminal 490A.

[0039] Fig.25 It is a perspective view showing a negative electrode terminal 490B according to a modification of the eighth embodiment in cross section. DETAILED DESCRIPTION

[0040] The embodiments for implementing the present invention are described with reference to the accompanying drawings. In order to make each embodiment easy to understand, the sizes and ratios of the components are sometimes exaggerated in each drawing. In each drawing, the same symbol is attached to the same structure. In each drawing, the long side direction X, the short side direction Y and the height direction Z of the battery 1 are shown by arrows. In each drawing, the long side direction X, the short side direction Y and the height direction Z of the battery 1 represent the relative positional relationship in the same drawing. That is, when the battery 1 is rotated 180 degrees and the top and bottom surfaces are reversed, or when the battery 1 is rotated 90 degrees and the top surface is configured as a side surface, the long side direction X, the short side direction Y and the height direction Z of the battery 1 change.

[0041] (Structure of Battery 1 Having Negative Electrode Terminal 420 of First Embodiment)

[0042] For the structure of the battery 1, refer to Figures 1 to 16 Provide explanation.

[0043] Figure 1 It is a perspective view showing the battery 1 according to the first embodiment. Figure 2 It is a perspective view showing the components around the negative electrode terminal 420 of the battery 1 in cross section. Figure 3 Yes means Figure 2 A side view of the components. Figure 4 It is a perspective view showing the components around the positive electrode terminal 410 of the battery 1 in cross section. Figure 5 Yes means Figure 4 A side view of the components. Figure 6 It is a perspective view showing the battery 1 in a partially exploded state. Figure 7 It is a perspective view showing the charging and discharging body 100 of the battery 1 . Figure 8 It is shown in cross section Figure 7 1 is a side view of a portion of the charge-discharge body 100. Fig. 9 This is a side view showing a part of a charging and discharging body 1100 according to a modified example in cross section. Fig.10 It is a perspective view showing the components around the negative electrode terminal 420 of the battery 1 in an exploded manner. Fig.11 It is a perspective view showing the components around the cleavage valve 530 and the sealing plug 540 of the battery 1 in an exploded manner. Fig.12 It is a perspective view showing the components around the positive electrode terminal 410 of the battery 1 in an exploded manner.

[0044] 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, a current cut-off body 300 connected to the current collector 200, an electrode terminal 400 connected to the current collector 200 or the current cut-off body 300, an outer casing 500 for accommodating or mounting components of the battery 1, an insulator 600 for insulating the components of the battery 1 from the outer casing 500, and a sealing body 700 for sealing the components of the battery 1 and the outer casing 500.

[0045] The charge / discharge body 100 performs charge and discharge. Figures 2 to 8 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 components in the order of positive electrode 110 and separator 130 and negative electrode 120 and separator 130 into a rectangular parallelepiped shape.

[0046] The positive electrode 110 includes a long positive electrode current collecting layer 111 and a positive electrode active material layer 112 bonded to the positive electrode current collecting layer 111. The positive electrode current collecting layer 111 includes a current collecting portion 111a and a positive electrode sheet 111b. The positive electrode active material layer 112 is bonded to the current collecting portion 111a. Figure 8 As shown, for example, it faces the entire area of ​​the collector portion 111a along the short side direction. The positive electrode sheet 111b protrudes in the short side direction of the collector portion 111a from the side edge 111c along the long side direction of the collector portion 111a. The positive electrode sheet 111b is formed integrally with the collector portion 111a. A plurality of positive electrode sheets 111b are formed on one collector portion 111a. The collector portion 111a 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.

[0047] The negative electrode 120 includes a long negative electrode current collecting layer 121 and a negative electrode active material layer 122 connected to the negative electrode current collecting layer 121. The negative electrode current collecting layer 121 includes a current collecting portion 121a and a negative electrode sheet 121b. Figure 8As shown, the width along the short side direction is longer than that of the collector 111a of the positive electrode 110. Both ends of the collector 111a of the positive electrode 110 along the short side direction are located within the range of the collector 121a of the negative electrode 120 along the short side direction via the separator 130. A negative electrode active material layer 122 is bonded to the collector 121a. The negative electrode active material layer 122, for example, faces the entire region along the short side direction of the collector 121a. The negative electrode sheet 121b protrudes in the short side direction of the collector 121a from the side edge 121c along the long side direction of the collector 121a. The negative electrode sheet 121b protrudes in the same direction as the positive electrode sheet 111b of the positive electrode 110 when stacked with the positive electrode 110 via the separator 130. The negative electrode sheet 121b is separated from the positive electrode sheet 111b of the positive electrode 110 in a state where it is stacked with the positive electrode 110 via the separator 130. The negative electrode sheet 121b is formed integrally with the collector 121a. A plurality of negative electrode sheets 121b are formed on one collector 121a. The collector 121a is formed of, for example, copper or a copper alloy. The negative electrode active material layer 122 contains a negative electrode active material composed of a carbon-based material, a binder, and a conductive additive. As a carbon-based material, for example, graphite is used.

[0048] The separator 130 insulates the positive electrode 110 from the negative electrode 120 and allows lithium ions to pass through. The separator 130 is formed in a long shape. Figure 8 As shown, the width along the short side direction is longer than that of the collector 111a of the positive electrode 110 and the collector 121a of the negative electrode 120. Both ends of the collector 111a of the positive electrode 110 along the short side direction and both ends of the collector 121a of the negative electrode 120 along the short side direction are located within the range of the separator 130 along the short side direction. The separator 130 is made of a porous material. As the separator 130, polyethylene (PE: polyethylene) or polypropylene (PP: polypropylene) is used. Instead of the separator 130, a heat-resistant insulating component may be used. In the case of such a structure, the separator 130 is not necessary.

[0049] The electrolyte 140 includes an organic solvent, a supporting salt, and an additive. The electrolyte 140 is also called an electrolytic solution. As the organic solvent, for example, carbonate esters are used. As the supporting salt, for example, a lithium salt is used.

[0050] For a charge / discharge body 1100 of a modified example of the charge / discharge body 100, refer to Fig. 9In the charge-discharge body 1100, the structure of the positive electrode 1110 is different from that of the positive electrode 110 of the charge-discharge body 100. In the structure of the charge-discharge body 1100, the same symbols are attached to the same structures as those of the charge-discharge body 100, and the description is omitted. The positive electrode active material layer 1112 of the charge-discharge body 1100 faces the portion of the collector 111a along the short side direction except for the two ends. The heat-resistant insulating layer 1113 of the charge-discharge body 1100 is bonded to the two ends of the collector 111a along the short side direction and the base end portion of the positive electrode sheet 111b.

[0051] The current collector 200 is connected to the charge / discharge body 100. The current collector 200 is also called a current collector plate. Figures 2 to 5 , Fig.10 and Fig.12 The illustrated current collector 200 includes a positive current collector plate 210 and a negative current collector plate 220 .

[0052] The positive electrode collector plate 210 connects the positive electrode sheet 111b of the charge-discharge body 100 to the positive terminal 410 via the current cut-off body 300. The positive electrode collector plate 210 includes a first base 210a in the shape of a rectangular parallelepiped plate, a second base 210b in the shape of a rectangular parallelepiped plate, and a connecting portion 210c that connects the first base 210a and the second base 210b in a stepped manner with different heights. A recessed portion 210d is formed on the top surface of the second base 210b to make the thickness of the second base 210b thinner. A fragile portion 210e is formed in the center of the recessed portion 210d in an annular shape to partially weaken the recessed portion 210d. The positive electrode collector plate 210 is formed, for example, of aluminum or an aluminum alloy.

[0053] The negative electrode collector plate 220 connects the negative electrode sheet 121b of the charge / discharge body 100 to the negative electrode terminal 420. The negative electrode collector plate 220 includes a rectangular plate-shaped base 220a and an insertion hole 220b that penetrates the base 220a. The insertion portion 420b of the negative electrode terminal 420 is inserted into the insertion hole 220b of the negative electrode collector plate 220. The negative electrode collector plate 220 is formed of, for example, copper or a copper alloy.

[0054] When the internal pressure of the battery 1 rises to a value exceeding a predetermined value, the current interruption body 300 is separated from the positive electrode current collector plate 210, thereby opening the current path between the current collector 200 and the positive electrode terminal 410. When the internal pressure of the battery 1 is within a predetermined value, the current interruption body 300 maintains the state of being joined to the positive electrode current collector plate 210, thereby maintaining the current path between the current collector 200 and the positive electrode terminal 410. The current interruption body 300 is also called a current interruption device (CID: Current Interrupt Device). Figure 4 , Figure 5 and Fig.12The illustrated current cut-off body 300 includes a partition 310 , a conductive member 320 , and a pair of support stands 330 .

[0055] The separator 310 includes a curved cylindrical main body 310a, a disc-shaped first joint 310b provided at the front end side of the main body 310a, and an annular second joint 310c provided at the base end side of the main body 310a. The first joint 310b is joined to the recess 210d of the positive electrode collector plate 210. The second joint 310c is joined to the conductive member 320. When the internal pressure of the battery 1 rises to exceed a specified value, the separator 310 is separated from the positive electrode collector plate 210. The separator 310 is formed of, for example, aluminum or an aluminum alloy.

[0056] The conductive component 320 is formed in a cylindrical shape. The conductive component 320 includes a disc-shaped base 320a and an insertion hole 320b opened in the center of the base 320a. The top surface of the conductive component 320 is joined to the positive electrode side first insulating plate 620. The peripheral edge of the bottom surface of the conductive component 320 is joined to the second joining portion 310c of the separator 310. The conductive component 320 is formed of, for example, aluminum or an aluminum alloy.

[0057] The support platform 330 includes a main body 330a of a rectangular parallelepiped extending in the short side direction of the battery 1, and foot portions 330b extending downward from both sides of the main body 330a in the long side direction. One support platform 330 is provided at each end of the separator 310 along the long side direction of the battery 1. The main body 330a is mounted on the first insulating plate 620 on the positive electrode side. The foot portion 330b is mounted on the second base portion 210b of the positive electrode collector plate 210. The support platform 330 is formed of, for example, an insulating resin.

[0058] The electrode terminal 400 is connected to the current collector 200 or the current interruption element 300 . Figures 1 to 6 , Fig.10 , Figures 12 to 16 The illustrated electrode terminal 400 includes a positive terminal 410 and a negative terminal 420 .

[0059] The positive terminal 410 is connected to the conducting member 320 of the current interrupter 300. The positive terminal 410 includes a rectangular plate-shaped base 410a, a cylindrical insertion portion 410b protruding downward from the base 410a, and a cylindrical joint portion 410c protruding downward from the periphery of the base 410a. The base 410a is in contact with the base 640a of the positive-side second insulating plate 640. The insertion portion 410b is inserted into the insertion hole 640b of the positive-side second insulating plate 640, the positive-side insertion hole 520a of the cover 520, the insertion hole 620b of the positive-side first insulating plate 620, and the insertion hole 320b of the conducting member 320. The joint portion 410c protrudes downward from the insertion hole 320b of the conducting member 320, extends radially outward, and is joined to the conducting member 320. That is, the joint portion 410c is subjected to a caulking process (embossing process / caulking process / die forging process / extrusion forging process) at the periphery of the insertion hole 320b of the conductive member 320. Furthermore, the joint portion 410c is welded (fused) to the periphery of the insertion hole 320b of the conductive member 320. The positive terminal 410 is formed of, for example, aluminum or an aluminum alloy.

[0060] (Structure of Negative Electrode Terminal 420)

[0061] For the structure of the negative terminal 420, refer to Figures 13 to 16 etc. for explanation. Fig.13 It is a perspective view showing a cross section of the negative electrode terminal 420 according to the first embodiment. Fig.14 is shown in exploded form Fig.13 A three-dimensional view of the negative terminal 420. Fig.15 It is a perspective view showing the connection between a plurality of batteries 1 and a bus bar 10 . Fig.16 It is an end view showing the negative electrode terminal 420 and the bus bar 10 according to the first embodiment.

[0062] The negative terminal 420 is an electrode terminal. Fig.14 As shown, it includes a first component 421, a second component 422 and a third component 423.

[0063] The first member 421 is electrically connected to the charge / discharge body 100 of the battery 1 via the negative electrode collector plate 220. The first member 421 contains a first metal. The first metal is, for example, copper or a copper alloy. That is, the first member 421 is formed of a material containing copper or a copper alloy.

[0064] The first component 421 is as Fig.14 and Fig.16 As shown in FIG. 4 , the head 421a includes a head 421a, a body 421b and a foot 421c. Fig.14The head 421a has an opposing portion 421a1 opposing the bus bar 10 along the height direction Z of the battery 1, and an outer peripheral portion 421a2 opposing the second component 422 along the longitudinal direction X and the lateral direction Y of the battery 1. The head 421a may be formed in a plate shape.

[0065] The main body 421b of the first component 421 is as shown in FIG. Fig.14 As shown, it is formed into a cylindrical shape. The main body 421b is formed integrally with the head 421a and is connected to the head 421a in a concentric circle. Compared with the head 421a, the main body 421b has a smaller diameter and a longer length along the height direction Z of the battery 1. The main body 421b has an outer peripheral portion 421b1 that is opposite to the third component 423 along the long side direction X and the short side direction Y of the battery 1. The main body 421b is formed in a plate shape.

[0066] The foot portion 421c of the first component 421 is as shown in FIG. Fig.14 As shown in FIG. 4 , the foot portion 421c is formed in a cylindrical shape. The foot portion 421c is formed integrally with the main body portion 421b and is connected to the main body portion 421b in a concentric circle. The foot portion 421c and the main body portion 421b have the same outer diameter. The foot portion 421c faces the head portion 421a across the main body portion 421b. Fig.14 As shown, the leg portion 421c is bent outwardly so that the diameter thereof increases, and is riveted to the negative electrode current collector plate 220. The leg portion 421c may be laser-bonded to the negative electrode current collector plate 220. The leg portion 421c may be laser-bonded to the negative electrode current collector plate 220 after being riveted to the negative electrode current collector plate 220.

[0067] The second component 422 is as follows Fig.14 and Fig.16 As shown, the second member 422 is joined to the first member 421. The second member 422 contains the first metal. That is, the second member 422 is formed of a material containing copper or a copper alloy.

[0068] The second component 422 is as follows Fig.14 As shown, the second member 422 is formed in a plate shape. The second member 422 has a first insertion portion 422a. The first member 421 is inserted into the first insertion portion 422a. In the second member 422, the inner peripheral surface of the first insertion portion 422a faces the outer peripheral portion 421b1 of the main body portion 421b.

[0069] The second component 422 is as follows Fig.16As shown, at the welding portion (welding portion) S, the first component 421 is laser-bonded from the side of the opposite surface P to the bus bar 10. The second component 422 is laser-bonded to the first component 421 in a state of being stacked along the height direction Z of the battery 1, that is, in a state of overlapping along the height direction Z of the battery 1. The opposite surface P is the surface of the negative terminal 420 facing the bus bar 10. The second component 422 is laser-bonded in an annular shape relative to the head 431a of the first component 421. The second component 422 and the first component 421 can be laser-bonded along the height direction Z of the battery 1. Fig.15 The battery 1 shown is laser-bonded linearly or arcuately in the short-side direction Y or the long-side direction X. The second member 422 and the first member 421 may also be laser-bonded in dots. The second member 422 may also be formed in a cylindrical shape.

[0070] The third component 423 is as follows Fig.14 and Fig.16 As shown, the third component 423 is joined to the second component 422. The third component 423 contains a second metal of a different material from the first metal. The second metal is, for example, aluminum or an aluminum alloy. That is, the third component 423 is formed of a material containing aluminum or an aluminum alloy. The third component 423 formed of aluminum or the like and the second component 422 formed of copper or the like are formed of a cladding material. That is, the third component 423 and the second component 422 are atomically bonded. The third component 423 and the second component 422 may also be riveted. The third component 423 and the second component 422 may also be formed by a non-melting joint with excellent durability other than atomic bonding. The third component 423 and the second component 422 may also be formed by welding with excellent durability.

[0071] The third component 423 is as follows Fig.14 As shown, the third component 423 is formed into a plate shape. Fig.14 As shown, the third component 423 has an opposing portion 423a that is opposed to the bus bar 10 along the height direction Z of the battery 1. The third component 423 has a second insertion portion 423b. The first component 421 is inserted into the second insertion portion 423b. In the third component 423, the inner peripheral surface of the second insertion portion 423b is opposed to the outer peripheral portion 421b1 of the main body portion 421b.

[0072] The third component 423 is as follows Fig.16 As shown, the third component 423 is provided on the same surface as the first component 421 on the side facing the surface P of the bus bar 10. Fig.16 As shown, the third component 423 is separated from the first component 421 in the stacking direction (height direction Z) of the first component 421 and the second component 422. That is, the third component 423 does not overlap with the first component 421 directly or indirectly in the height direction Z of the battery 1.

[0073] The third component 423 is as follows Fig.16As shown, on the side of the surface P facing the bus bar 10, the third component 423 is adjacent to the first component 421 along the long side direction X or the short side direction Y of the battery 1. The third component 423 faces the first component 421 on the surface along the surface P facing the bus bar 10 without interposing other components of the negative terminal 420. The third component 423 faces the first component 421 in a non-contact state, that is, in a state where a gap is provided. The gap is, for example, tens of μm to hundreds of μm. The gap may be, for example, hundreds of μm to several mm. The gap may be, for example, less than the thickness of the inner peripheral surface of the second insertion portion 423b of the third component 423 in the stacking direction (height direction). From the viewpoint of the rigidity of the negative terminal 420, the gap may be less than the thickness (height direction Z) of the second component 422. From the viewpoint of the assembly performance and stress relaxation of the negative terminal 420, the gap may be the gap between the outer peripheral portion 421b1 of the first component 421 and the first insertion portion 422a of the second component 422. The third member 423 and the first member 421 may be in contact with each other, that is, facing each other without a gap.

[0074] The third component 423 is as follows Fig.16 As shown, at the welding portion T, the bus bar 10 is laser bonded to the bus bar 10 on the side of the surface P facing the bus bar 10. The third component 423 and the bus bar 10 are laser bonded in a stacked state along the height direction Z of the battery 1, that is, in an overlapping state. The third component 423 is bonded to the bus bar 10 at more than two locations across the first component 421 along the direction intersecting the height direction Z. The direction intersecting the height direction Z is the short side direction Y or the long side direction X of the battery 1. The third component 423 is laser bonded to the bus bar 10 in a point-like, line-like, arc-like or ring-like manner.

[0075] The third component 423 is as follows Fig.16 As shown, the first component 421 and the third component 423 are connected to the bus bar 10 on the surface P facing the bus bar 10. Fig.16 As shown, on the side of the facing surface P with the bus bar 10, the first component 421 and the third component 423 are adjacent to each other along the long side direction X or the short side direction Y of the battery 1. That is, the first component 421 and the third component 423 are facing each other along the facing surface P with the bus bar 10 without sandwiching other components of the negative terminal 420. When the first component 421 and the third component 423 are viewed from the side of the facing surface P with the bus bar 10, other components of the negative terminal 420 are not sandwiched between them.

[0076] The first member 421 and the third member 423 face each other in a partially non-contact state, that is, in a state in which a gap is partially provided along the annular shape. The gap is, for example, several μm to several hundred μm. The gap may also be, for example, several hundred μm to several mm.

[0077] The first member 421 and the third member 423 may face each other in a state of being completely non-contacting, that is, in a state of being provided with a gap in an annular shape.

[0078] The first member 421 and the third member 423 may face each other in a contact state, that is, in a state where no gap is provided.

[0079] Here, in the case of a structure in which there is no gap between the first component 421 and the third component 423, when the first component 421 and the third component 423 are viewed from the side facing the surface P of the bus bar 10, there is no second component 422 in the gap between the first component 421 and the third component 423. Such a structure includes a structure in which the first component 421 and the third component 423 are adjacent to each other on the side facing the surface P of the bus bar 10 along the long side direction X or the short side direction Y of the battery 1.

[0080] In addition, in the case of a structure in which a gap exists between the first component 421 and the third component 423 but the gap cannot be visually recognized, when the first component 421 and the third component 423 are viewed from the side of the surface P facing the bus bar 10, the second component 422 does not exist in the gap between the first component 421 and the third component 423. Such a structure is also included in the structure in which the first component 421 and the third component 423 are adjacent to each other on the side of the surface P facing the bus bar 10 along the long side direction X or the short side direction Y of the battery 1. The gap that cannot be visually recognized is, for example, several μm to several tens of μm.

[0081] On the other hand, in the case of a structure in which a visually recognizable gap is provided between the first component 421 and the third component 423, when the first component 421 and the third component 423 are viewed from the side of the surface P facing the bus bar 10, the second component 422 may be recognized through the gap between the first component 421 and the third component 423. Such a structure includes a structure in which the first component 421 and the third component 423 are adjacent to each other on the side of the surface P facing the bus bar 10 along the long side direction X or the short side direction Y of the battery 1. That is, even if the existence of another component such as the second component 422 is recognized from the gap between the first component 421 and the third component 423, the other component is located below the first component 421 or the third component, including a structure in which the first component 421 and the third component 423 are adjacent to each other on the side of the surface P facing the bus bar 10 along the long side direction X or the short side direction Y of the battery 1.

[0082] In the negative electrode terminal 420, the first member 421 and the second member 422 are electrically connected by overlapping and joining in the height direction Z of the battery 1. The second member 422 and the third member 423 are electrically connected by being made of a cladding material.

[0083] The exterior body 500 accommodates or mounts the components of the battery 1 . Figures 1 to 6and Figures 10 to 12 The outer casing 500 shown includes a container 510 , a lid 520 , a cleavage valve 530 , and a sealing plug 540 .

[0084] The container 510 contains the charge / discharge body 100 and the like. The container 510 is formed of a rectangular metal can. The container 510 includes an opening 510a opened along the longitudinal direction and a storage portion 510b connected to the opening 510a. The container 510 is formed of, for example, aluminum or an aluminum alloy.

[0085] The cover 520 seals the opening 510a of the container 510. The container 510 is formed of a long plate-shaped metal plate. On the cover 520, a positive electrode side insertion hole 520a consisting of a circular through hole is formed on one end side in the long side direction. In the positive electrode side insertion hole 520a, the insertion portion 410b of the positive terminal 410 is inserted. On the cover 520, a negative electrode side insertion hole 520b consisting of a circular through hole is formed on the other end side in the long side direction. In the negative electrode side insertion hole 520b, the insertion portion 420b of the negative terminal 420 is inserted. In the cover 520, an injection insertion hole 520c consisting of a circular through hole is formed between the positive electrode side insertion hole 520a and the negative electrode side insertion hole 520b. In the injection insertion hole 520c, the insertion portion 540b of the sealing plug 540 is inserted. The cover 520 is welded to the container 510. The cover 520 is formed of, for example, aluminum or an aluminum alloy.

[0086] The cracking valve 530 is as follows Fig.11 As shown, the cleavage valve 530 is formed integrally with the cover 520. The cleavage valve 530 cleaves when the internal pressure of the battery 1 reaches a predetermined value, and the internal pressure of the battery 1 becomes the atmospheric pressure. The cleavage valve 530 is also called a safety valve.

[0087] Sealing plug 540 Figure 6 As shown in FIG. 5 , the injection insertion hole 520c of the cover 520 is sealed. The sealing plug 540 is formed in a cylindrical shape. Fig.11 As shown, the sealing plug 540 includes a head portion 540a having a relatively large outer diameter and an insertion portion 540b continuous with the head portion 540a and having a relatively small outer diameter. The head portion 540a of the sealing plug 540 is welded to the cover 520. The sealing plug 540 is formed of, for example, aluminum or an aluminum alloy.

[0088] The insulator 600 insulates the components of the battery 1 from the exterior body 500 . Figures 2 to 5 , Fig.10 and Fig.12 The illustrated insulator 600 includes an insulating cover 610 , a positive-side first insulating plate 620 , a negative-side first insulating plate 630 , a positive-side second insulating plate 640 , and a negative-side second insulating plate 650 .

[0089] The insulating cover 610 covers the charging and discharging body 100. The insulating cover 610 exposes one side portion 100a of the charging and discharging body 100 to the outside and covers the portion other than the one side portion 100a of the charging and discharging body 100. The insulating cover 610 is formed in a pentahedral shape, for example, and is folded into a box shape. The insulating cover 610 is formed of, for example, polypropylene.

[0090] The first insulating plate 620 on the positive electrode side insulates the positive electrode collector plate 210 and the conductive component 320 from the cover 520. The first insulating plate 620 on the positive electrode side includes a base 620a in the shape of a rectangular parallelepiped plate, an insertion hole 620b penetrating the base 620a, and a convex portion 620c annularly surrounding the side edge of the base 620a and protruding in a direction away from the cover 520. In the first insulating plate 620 on the positive electrode side, the positive electrode collector plate 210 and the conductive component 320 are accommodated in a space formed by the base 620a and the convex portion 620c. The insertion portion 410b of the positive terminal 410 is inserted into the insertion hole 620b. The first insulating plate 620 on the positive electrode side is formed of, for example, an insulating resin.

[0091] The negative electrode side first insulating plate 630 insulates the negative electrode current collector plate 220 from the cover 520. The negative electrode side first insulating plate 630 includes a rectangular parallelepiped plate-shaped base 630a, an insertion hole 630b penetrating the base 630a, and a convex portion 630c annularly surrounding the side edge of the base 630a and protruding in a direction away from the cover 520. On the negative electrode side first insulating plate 630, the negative electrode current collector plate 220 is accommodated in a space formed by the base 630a and the convex portion 630c. The insertion portion 420b of the negative electrode terminal 420 is inserted into the insertion hole 630b. The negative electrode side first insulating plate 630 is formed of, for example, an insulating resin.

[0092] The second insulating plate 640 on the positive electrode side insulates the positive electrode terminal 410 from the cover 520. The second insulating plate 640 on the positive electrode side includes a base 640a in the shape of a rectangular parallelepiped plate, an insertion hole 640b penetrating the base 640a, and a convex portion 640c annularly surrounding the side edge of the base 640a and protruding in a direction away from the cover 520. The positive electrode terminal 410 is accommodated in the space formed by the base 640a and the convex portion 640c on the second insulating plate 640 on the positive electrode side. The insertion portion 410b of the positive electrode terminal 410 is inserted into the insertion hole 640b. The second insulating plate 640 on the positive electrode side is formed of, for example, an insulating resin.

[0093] The negative electrode side second insulating plate 650 insulates the negative electrode terminal 420 from the cover 520. The negative electrode side second insulating plate 650 includes a rectangular parallelepiped plate-shaped base 650a, an insertion hole 650b penetrating the base 650a, and a convex portion 650c annularly surrounding the side edge of the base 650a and protruding in a direction away from the cover 520. The negative electrode side second insulating plate 650 accommodates the negative electrode terminal 420 in a space formed by the base 650a and the convex portion 650c. The insertion portion 420b of the negative electrode terminal 420 is inserted into the insertion hole 650b. The negative electrode side second insulating plate 650 is formed of, for example, an insulating resin.

[0094] The sealing body 700 seals the components of the battery 1 and the exterior body 500 . Figures 2 to 5 , Fig.10 and Fig.12 The seal 700 shown includes a positive electrode side gasket 710 and a negative electrode side gasket 720 .

[0095] The positive electrode side gasket 710 seals the cover 520 on the positive electrode terminal 410 side and seals the outer body 500. The positive electrode side gasket 710 is formed into a cylindrical shape. The positive electrode side gasket 710 includes a first insertion portion 710a with a relatively large outer diameter, a second insertion portion 710b that is continuous with the first insertion portion 710a and has a relatively small outer diameter, and an insertion hole 710c that penetrates the first insertion portion 710a and the second insertion portion 710b. The positive electrode side gasket 710 is as shown in FIG. Figure 5 As shown, it is disposed between the positive terminal 410 and the positive collector plate 210. The first insertion portion 710a is inserted into Fig.12 The second insertion portion 710b is inserted into the insertion hole 620b of the positive electrode side first insulating plate 620. Fig.12 The positive electrode side insertion hole 520a of the cover 520 and the positive electrode side second insulating plate 640 are inserted into the insertion hole 640b. Fig.12 The insertion portion 410b of the positive electrode terminal 410 is shown. The positive electrode side gasket 710 is formed of, for example, rubber having insulating properties and elasticity.

[0096] The negative electrode side gasket 720 seals the cover 520 on the negative electrode terminal 420 side and seals the outer body 500. The negative electrode side gasket 720 is formed into a cylindrical shape. The negative electrode side gasket 720 includes a first insertion portion 720a with a relatively large outer diameter, a second insertion portion 720b that is continuous with the first insertion portion 720a and has a relatively small outer diameter, and an insertion hole 720c that penetrates the first insertion portion 720a and the second insertion portion 720b. Figure 3 As shown, the first insertion portion 720a is disposed between the second component 422 of the negative terminal 420 and the negative electrode collector plate 220. Fig.11 The second insertion portion 720b is inserted into the insertion hole 630b of the negative electrode side first insulating plate 630. Fig.11 The negative electrode side insertion hole 520b of the cover 520 and the negative electrode side second insulating plate 650 are inserted into the insertion hole 720c. Fig.11 The main body 421b of the first member 421 of the negative electrode terminal 420 is shown. The negative electrode side gasket 720 is formed of, for example, rubber having insulating properties and elasticity.

[0097] (Structure of Bus Bar 10)

[0098] The bus bar 10 is a conductive component. Fig.15 As shown, for example, one battery 1 adjacent to the other battery 1 along the short side direction Y of the battery 1 is electrically connected. The bus bar 10 contains a second metal. That is, the bus bar 10 is formed of a material containing aluminum or an aluminum alloy. The bus bar 10 containing aluminum or the like is joined to the positive terminal 410 containing aluminum or the like of one battery 1 and the negative terminal 420 containing aluminum or the like of the other battery 1.

[0099] (Effects of Negative Electrode Terminal 420 and Battery 1 Having Negative Electrode Terminal 420)

[0100] For the effects of the negative electrode terminal 420 and the battery 1 having the negative electrode terminal 420 of the first embodiment, refer to Fig.16 etc. for explanation.

[0101] In the battery terminal included in the battery 1, the third component 423 is bonded to the bus bar 10 on the surface P facing the bus bar 10. The first component 421 and the third component 423 are as shown in FIG. Fig.16 As shown, on the side facing the surface P of the bus bar 10 , the battery 1 is adjacent along the long side direction X or the short side direction Y of the battery 1 .

[0102] According to such a structure, the characteristics of the electrode terminal included in the battery 1 can be improved. Specifically, for example, in the electrode terminal, the first component 421 is connected to the charging and discharging body 100, and the third component 423 is connected to the bus bar 10. Therefore, by adopting a structure in which the first component 421 and the third component 423 of the electrode terminal are adjacent to each other, the area of ​​the electrode terminal in the region along the facing surface P can be reduced. That is, the electrode terminal can be made smaller along the facing surface P.

[0103] The electrode terminal is applied to the negative electrode terminal 420. According to such a structure, the negative electrode terminal 420, whose material is converted from copper to one containing aluminum, can be sufficiently joined to the bus bar 10 containing aluminum.

[0104] In the negative electrode terminal 420, the first member 421 and the second member 422 are laser-bonded. According to such a structure, the first member 421 and the second member 422 can be sufficiently bonded by a highly versatile bonding method such as laser bonding.

[0105] In the negative terminal 420, the first component 421 and the second component 422 are laser-bonded from the side of the facing surface P. The facing surface P is the surface of the negative terminal 420 facing the bus bar 10. According to such a structure, there is no need to consider the interference between the components of the negative terminal 420 located on the side of the non-facing surface Q and the laser beam. The components are, for example, the main body 421b and the leg 421c of the first component 421.

[0106] The first component 421 of the negative terminal 420 is provided on the same plane as the third component 423 on the side of the surface P facing the bus bar 10. The term "on the same plane" is defined in consideration of the manufacturing tolerance of the outer shapes of the first component 421 and the third component 423. That is, the first component 421 protrudes from the third component 423 by several μm to several hundred μm on the same plane. Similarly, the third component 423 protrudes from the first component 421 by several μm to several hundred μm on the same plane. The positional relationship between the first component 421 and the third component 423 is defined on the same plane so that the third component 423 and the bus bar 10 can be joined in a state of at least partial contact. According to such a structure, when the bus bar 10 and the third component 423 are joined, a gap can be prevented from being generated between the first component 411 and the bus bar 10. In addition, according to such a structure, even if the bus bar 10 and the third component 423 are laser joined, splashes during laser joining can be prevented from intruding into the gap between the first component 411 and the bus bar 10. In addition, according to such a structure, when the bus bar 10 and the third member 423 are joined, the first member 421 does not protrude toward the bus bar 10 more than the third member 423. That is, it is possible to prevent a gap from being generated between the third member 423 and the bus bar 10. Therefore, the third member 423 and the bus bar 10 can be fully joined.

[0107] In the negative terminal 420, the first component 421 and the third component 423 are separated in the stacking direction (height direction Z) of the first component 421 and the second component 422. The first component 421 and the third component 423 do not directly overlap in the height direction Z. The first component 421 and the third component 423 do not overlap indirectly in the height direction Z via other components. That is, in the portion where the third component 423 joined to the bus bar 10 is located, the third component 423 overlaps only with the second component 422 in the height direction Z. According to such a structure, in the portion where the third component 423 joined to the bus bar 10 is located, the thickness of the negative terminal 420 in the stacking direction (height direction Z) can be suppressed.

[0108] In the negative terminal 420, the third member 423 and the bus bar 10 are joined at two or more locations across the first member 421. With such a structure, even if stress is generated in the bus bar 10 due to expansion or contraction of the battery 1, separation of the third member 423 and the bus bar 10 can be suppressed.

[0109] In the negative terminal 420, the second member 422 and the third member 423 are formed of a cladding material. According to such a structure, the second member 422 and the third member 423 can be fully joined. In particular, according to such a structure, members of different materials such as the second member 422 formed of copper or the like and the third member 423 formed of aluminum or the like can be fully joined.

[0110] (Negative Electrode Terminal 430 of Second Embodiment)

[0111] (Structure of Negative Electrode Terminal 430)

[0112] For the structure of the negative electrode terminal 430 of the second embodiment, refer to Fig.17 Provide explanation. Fig.17 It is an end view showing the negative electrode terminal 430 and the bus bar 10 according to the second embodiment.

[0113] The negative terminal 430 is an electrode terminal. For the negative terminal 430, the same structure as the negative terminal 420 is assigned the same reference numerals as the negative terminal 420 and the description thereof is omitted. For the negative terminal 430, the structure different from the negative terminal 420 is assigned different reference numerals as the negative terminal 420 and the description thereof is omitted.

[0114] Negative terminal 430 Fig.17 As shown, it includes a first component 421, a second component 422 and a third component 423. The second component 422 is as shown in Fig.17 As shown, the second component 422 is laser-bonded to the first component 421 at the welding portion U from the non-opposing surface Q side. The non-opposing surface Q is the surface on the opposite side of the opposing surface P of the negative terminal 430 and the bus bar 10. The second component 422 is laser-bonded to the head 431a of the first component 421 in an annular shape. The second component 422 and the first component 421 may also be laser-bonded along Figure 1 The laser bonding is performed linearly or arcuately in the short-side direction Y or the long-side direction X shown. The second member 422 and the first member 421 may also be laser bonded in a point-like manner. The second member 422 may also be formed in a cylindrical shape.

[0115] (Effect of negative terminal 430)

[0116] For the effect of the negative electrode terminal 430 of the second embodiment, refer to Fig.17 Provide explanation.

[0117] In the negative terminal 430, the first component 421 and the second component 422 are laser-bonded from the non-opposing surface Q side. The non-opposing surface Q is a surface on the opposite side of the opposing surface P where the negative terminal 430 and the bus bar 10 are opposed. According to such a structure, in the bonding between the negative terminal 430 and the bus bar 10 located on the opposing surface P side, the influence of the laser bonding on the non-opposing surface Q side can be suppressed. In addition, according to such a structure, the influence of the laser bonding on the non-opposing surface Q side on the components of the negative terminal 430 located on the opposing surface P side can be suppressed.

[0118] (Negative Electrode Terminal 440 of the Third Embodiment)

[0119] (Structure of Negative Electrode Terminal 440)

[0120] For the structure of the negative electrode terminal 440 of the third embodiment, refer to Fig.18 Provide explanation. Fig.18 It is an end view showing a negative electrode terminal 440 and a bus bar 10 according to the third embodiment.

[0121] The negative terminal 440 is an electrode terminal. For the negative terminal 440, the same structure as the negative terminal 420 is assigned the same reference numeral as the negative terminal 420 and the description thereof is omitted. For the negative terminal 440, the structure different from the negative terminal 420 is assigned a reference numeral different from the negative terminal 420 and the description thereof is omitted.

[0122] The negative terminal 440 is partially recessed in a direction away from the bus bar 10 relative to the surface P facing the bus bar 10. Fig.18 As shown, it includes a first component 441, a second component 422 and a third component 423.

[0123] The first member 441 contains a first metal. That is, the first member 441 is formed of a material containing copper or a copper alloy.

[0124] The first component 441 is partially recessed in a direction away from the bus bar 10. Fig.18 As shown, the first component 421 includes a head 441a, a body 421b and a foot 421c. The head 441a has an opposing portion 441a1 that faces the bus bar 10 along the height direction Z of the battery 1, and an outer peripheral portion 441a2 that faces the second component 422 along the long side direction X and the short side direction Y of the battery 1. The head 441a is shorter in length along the stacking direction (height direction Z) than the head 421a of the first component 421. That is, in the first component 441, the head 441a is recessed in a direction away from the bus bar 10. There is a gap between the first component 441 and the bus bar 10.

[0125] (Effect of negative terminal 440)

[0126] For the effect of the negative electrode terminal 440 of the third embodiment, refer to Fig.18 Provide explanation.

[0127] The negative terminal 440 is partially recessed in a direction away from the bus bar 10. According to such a structure, when the negative terminal 440 is joined to the bus bar 10, the portion of the negative terminal 440 that is not actively joined to the bus bar 10 can be prevented from interfering with the bus bar 10. The portion of the negative terminal 440 that is electrically connected to the bus bar 10 is the third member 423. Therefore, by partially recessing the first member 441 in a direction away from the bus bar 10, when the third member 423 is joined to the bus bar 10, interference between the first member 441 and the bus bar 10 can be suppressed.

[0128] The second member 442 may be recessed in a direction away from the bus bar 10. In this case, in a state where the third member 423 and the bus bar 10 are joined, interference between the second member 442 and the bus bar 10 can be suppressed.

[0129] (Negative Electrode Terminal 450 of Fourth Embodiment)

[0130] (Structure of Negative Electrode Terminal 450)

[0131] For the structure of the negative electrode terminal 450 of the fourth embodiment, refer to Fig.19 Provide explanation. Fig.19 It is an end view showing a negative electrode terminal 450 and a bus bar 10 according to the fourth embodiment.

[0132] The negative terminal 450 is an electrode terminal. For the negative terminal 450, the same structure as the negative terminal 420 is assigned the same reference numerals as the negative terminal 420 and the description thereof is omitted. For the negative terminal 450, the structure different from the negative terminal 420 is assigned different reference numerals as the negative terminal 420 and the description thereof is omitted.

[0133] Negative terminal 450 Fig.19 As shown, it includes a first component 451, a second component 422 and a third component 423.

[0134] The first member 451 contains a first metal. That is, the first member 451 is formed of a material containing copper or a copper alloy.

[0135] The first component 451 is as Fig.19As shown, it includes a head 451a, a main body 421b and a leg 421c. The head 451a has a facing portion 451a1 facing the bus bar 10 along the height direction Z of the battery 1, and an outer peripheral portion 451a2 facing the second component 422 along the long side direction X and the short side direction Y of the battery 1. The head 451a has a recessed portion 451a3. The recessed portion 451a3 is a portion where the facing portion 451a1 of the first component 451 is partially recessed. The recessed portion 451a3 of the first component 451 is laser-bonded to the second component 422 from the side of the facing surface of the bus bar 10. The recessed portion 451a3 is laser-bonded to the facing portion 451a1 in an annular shape. The recessed portion 451a3 may also be laser-bonded to the facing portion 451a1 in an arc shape. That is, the recessed portion 451a3 may also be laser-bonded to the facing portion 451a1 intermittently.

[0136] (Effect of negative terminal 450)

[0137] For the effect of the negative electrode terminal 450 of the fourth embodiment, refer to Fig.19 Provide explanation.

[0138] In the negative terminal 450, the first component 451 and the second component 422 are laser-bonded at the concave portion 451a3 of the first component 451 from the side of the surface P facing the bus bar 10. According to such a structure, the splashes generated during laser bonding can be sealed in the concave portion 451a3, and the rigidity of the first component 451 can be maintained. Therefore, for example, when the first component 451 is riveted to the negative electrode collector plate 220, the deformation of the first component 451 can be suppressed. In the first component 451, the position of the concave portion 451a3 is preferably set outside the main body 421b. It is possible to prevent the stress generated when the first component 451 is riveted to the negative electrode collector plate 220 from being transmitted to the concave portion 451a3.

[0139] (Negative Electrode Terminal 460 of Fifth Embodiment)

[0140] (Structure of Negative Electrode Terminal 460)

[0141] For the structure of the negative electrode terminal 460 of the fifth embodiment, refer to Fig. 20 Provide explanation. Fig. 20 It is an end view showing a negative electrode terminal 460 and a bus bar 20 according to the fifth embodiment.

[0142] The negative terminal 460 is an electrode terminal. For the negative terminal 460, the same structure as the negative terminal 420 is assigned the same reference numerals as the negative terminal 420 and the description thereof is omitted. For the negative terminal 460, the structure different from the negative terminal 420 is assigned different reference numerals as the negative terminal 420 and the description thereof is omitted.

[0143] The negative terminal 460 partially protrudes beyond the facing surface P of the bus bar 20 toward the bus bar 20. Here, the bus bar 20 is different from the bus bar 10 in that it has a recess 20a for accommodating the first component 461 on the facing surface P side. Fig. 20 As shown, it includes a first component 451, a second component 422 and a third component 423.

[0144] The first member 461 contains a first metal. That is, the first member 461 is formed of a material containing copper or a copper alloy.

[0145] The first component 461 is as Fig. 20 As shown, it includes a head 461a, a main body 421b and a foot 421c. The head 461a has an opposing portion 461a1 that faces the bus bar 10 along the height direction Z of the battery 1, and an outer peripheral portion 461a2 that faces the second component 422 along the long side direction X and the short side direction Y of the battery 1. The head 461a is longer in the stacking direction (height direction Z) than the head 421a of the first component 421. That is, in the first component 461, the head 461a protrudes in the direction close to the recess 20a of the bus bar 20. A gap is set between the first component 461 and the recess 20a of the bus bar 20. It is also possible not to set a gap between the first component 461 and the recess 20a of the bus bar 20.

[0146] (Effect of negative terminal 460)

[0147] For the effect of the negative electrode terminal 460 of the fifth embodiment, refer to Fig. 20 Provide explanation.

[0148] The negative electrode terminal 460 partially protrudes beyond the surface P facing the bus bar 20 in a direction approaching the bus bar 20 .

[0149] The bus bar 20 has a recess 20a for accommodating the first member 461. With such a structure, when the negative electrode terminal 460 is joined to the bus bar 10, even if the first member 461 protrudes toward the bus bar 20 side compared to the third member 453, the third member 453 can be joined to the bus bar 20. That is, the design and manufacturing errors of the first member 461 can be alleviated.

[0150] The second component 442 may be made to protrude in a direction approaching the bus bar 20 beyond the opposing surface P with respect to the bus bar 20. The bus bar 20 has a structure having a recess for accommodating the second component 442. In this case, when the third component 453 is joined to the bus bar 20, interference between the second component 442 and the bus bar 20 can be prevented. That is, the design and manufacturing errors of the second component 442 can be alleviated.

[0151] (Negative Electrode Terminal 470 of Sixth Embodiment)

[0152] (Structure of Negative Electrode Terminal 470)

[0153] For the structure of the negative electrode terminal 470 of the sixth embodiment, refer to Fig.21 Provide explanation. Fig.21 It is an end view showing a negative electrode terminal 470 and a bus bar 10 according to the sixth embodiment.

[0154] The negative terminal 470 is an electrode terminal. For the negative terminal 470, the same structure as the negative terminal 420 is assigned the same reference numeral as the negative terminal 420 and the description thereof is omitted. For the negative terminal 470, the structure different from the negative terminal 420 is assigned a reference numeral different from the negative terminal 420 and the description thereof is omitted.

[0155] Negative terminal 470 Fig.21 As shown, the first component 421, the second component 422 and the third component 423 are included. In the negative terminal 470, the first component 421 and the second component 422 are riveted together. In the negative terminal 470, the first component 421 and the second component 422 may be laser-bonded after the first component 421 and the second component 422 are riveted together.

[0156] (Effect of negative terminal 470)

[0157] For the effect of the negative electrode terminal 470 of the sixth embodiment, refer to Fig.21 Provide explanation.

[0158] In the negative electrode terminal 470, the first member 421 and the second member 422 are joined by caulking. According to such a structure, the first member 421 and the second member 422 can be joined by inputting mechanical stress to the first member 421 and the second member 422.

[0159] In the negative electrode terminal 470, the first member 421 and the second member 422 may be laser-bonded after the first member 421 and the second member 422 are caulked and bonded. With such a structure, the first member 421 and the second member 422 can be bonded more fully.

[0160] (Negative Electrode Terminal 480 of Seventh Embodiment)

[0161] (Structure of negative electrode terminal 480)

[0162] For the structure of the negative electrode terminal 480 of the seventh embodiment, refer to Fig. 22 Provide explanation. Fig. 22 It is an end view showing a negative electrode terminal 480 and a bus bar 10 according to the seventh embodiment.

[0163] The negative terminal 480 is an electrode terminal. For the negative terminal 480, the same structure as the negative terminal 420 is assigned the same reference numeral as the negative terminal 420 and the description thereof is omitted. For the negative terminal 480, the structure different from the negative terminal 420 is assigned a reference numeral different from the negative terminal 420 and the description thereof is omitted.

[0164] Negative terminal 480 Fig. 22 As shown, it includes a first component 421, a second component 482 and a third component 483.

[0165] The second component 482 is joined to the first component 421. The second component 482 contains the first metal. That is, the second component 482 is formed of a material containing copper or a copper alloy. In the second component 482, a step portion 482b is formed by partially recessing the side of the surface P facing the bus bar 10. The second component 482 and the first component 421 are adjacent to each other along the stacking direction (height direction Z) via the step portion 482b. That is, the second component 482 and the first component 421 face each other in a direction intersecting the stacking direction (height direction) Z. The thickness of the step portion 482b of the second component 482 in the stacking direction (height direction Z) is equivalent to the thickness of the second component 422.

[0166] The third member 483 is joined to the second member 482. The third member 483 contains the second metal. That is, the third member 483 is formed of a material containing aluminum or an aluminum alloy. The third member 483 is formed to be thinner than the third member 423 by an amount corresponding to the portion where the second member 482 is thicker than the second member 422. The outer shape of the third member 483 corresponds to a shape in which the third member 423 is thinner in the stacking direction (height direction Z).

[0167] (Effect of negative terminal 480)

[0168] For the effect of the negative electrode terminal 480 of the seventh embodiment, refer to Fig. 22 Provide explanation.

[0169] In the negative terminal 480, the second component 482 is adjacent to the first component 421 along the stacking direction (height direction Z). That is, the second component 482 and the first component 421 are opposite to each other in the direction intersecting the stacking direction (height direction Z). According to such a structure, in the second component 482 and the third component 483, which are particularly composed of a cladding material, when the third component 483 is cut to expose the second component 482, it is possible to expose the second component 482 without depending on the positional deviation of the interface between copper and aluminum in the cladding material. That is, such a structure is equivalent to a structure in which a part of the second component 482 is also cut when the third component 483 is cut in consideration of the positional error of the interface in the cladding material. Therefore, the second component 482 and the first component 481 can be fully joined without depending on the positional deviation of the interface of the cladding material.

[0170] (Negative Electrode Terminal 490A and Negative Electrode Terminal 490B of Eighth Embodiment)

[0171] (Structure of negative terminal 490A)

[0172] For the structure of the negative electrode terminal 490A of the eighth embodiment, refer to Fig.23 and Fig.24 Provide explanation. Fig.23 It is a perspective view showing a negative electrode terminal 490A according to the eighth embodiment in cross section. Fig.24 is shown in exploded form Fig.23 A three-dimensional view of the negative terminal 490A.

[0173] The negative terminal 490A is an electrode terminal. For the negative terminal 490A, the same structure as the negative terminal 420 is assigned the same reference numerals as the negative terminal 420 and the description thereof is omitted. For the negative terminal 490A, the structure different from the negative terminal 420 is assigned different reference numerals as the negative terminal 420 and the description thereof is omitted.

[0174] Negative terminal 490A Fig.23 and Fig.24 As shown, it includes a first component 491 , a pair of second components 492 and a third component 493 .

[0175] The first member 491 is electrically connected to the charge / discharge body 100 of the battery 1 via the negative electrode current collector plate 220. The first member 491 contains a first metal. That is, the first member 491 is formed of a material containing copper or a copper alloy.

[0176] The first component 491 is as Fig.23 and Fig.24 As shown in FIG. 4 , the head 491a includes a head portion 491a, a body portion 421b, and a foot portion 421c. Fig.24 As shown in FIG. 4, the head 491a is formed into a plate shape. Fig.24As shown in FIG. 1 , the head 491a has an opposing portion 491a1 that is opposed to the bus bar 10 along the height direction Z of the battery 1. Fig.24 As shown, it has an outer portion 491 a 2 facing the second component 422 along the short side direction Y of the battery 1 .

[0177] A pair of second components 492 such as Fig.23 As shown, the second member 492 is joined to the first member 491. The second member 492 contains the first metal. That is, the second member 492 is formed of a material containing copper or a copper alloy.

[0178] A pair of second components 492 such as Fig.24 As shown, it is formed into a square column shape. The second component 492 has an opposing portion 492a that is opposite to the bus bar 10 along the height direction Z of the battery 1. The second component 492 is connected to the outer side 491a2 of the first component 491 along the short side direction Y of the battery 1. The second component 492 is laser-bonded to the first component 491 from the opposing surface P side along the boundary with the first component 491. That is, the second component 492 and the first component 491 are laser-bonded in a top-contact state. The second component 492 and the first component 491 can also be joined in a point shape.

[0179] The third component 493 is as follows Fig.23 As shown, the third member 493 is joined to the second member 492. The third member 493 contains the second metal. That is, the third member 493 is formed of a material containing aluminum or an aluminum alloy. The third member 493 is atomically joined to the second member 492. That is, the third member 493 formed of aluminum or the like and the second member 492 formed of copper or the like are formed of a cladding material. The third member 493 and the second member 492 may also be joined by riveting.

[0180] The third component 493 is as follows Fig.24 The third component 493 has a facing portion 493a facing the bus bar 10 along the height direction Z of the battery 1. Fig.24 As shown, the first component 491 and the second component 492 are mounted on the recessed portion 493b. Fig.24 As shown, there is an insertion portion 493c that passes through the recessed portion 493b. In the insertion portion 493c, the main body portion 421b of the first component 491 is inserted. The third component 493, the second component 492 and the first component 491 are as shown in FIG. Fig.23 As shown, on the side facing the surface P of the bus bar 10 , it is adjacent to the battery 1 along the longitudinal direction X.

[0181] The third component 493 is laser-bonded to the busbar 10 on the side of the surface P facing the busbar 10. The third component 493 and the busbar 10 are laser-bonded in a stacked state, i.e., in an overlapped state, along the height direction Z of the battery 1. The third component 493 is bonded to the busbar 10 at two or more locations across the first component 491 and the pair of second components 492 in a direction intersecting the height direction Z. The third component 493 and the busbar 10 are laser-bonded linearly along the short side direction of the battery. The third component 493 and the busbar 10 may also be laser-bonded in a dotted manner.

[0182] In the negative terminal 490A, the first member 491 and the second member 492 are electrically connected by laser bonding. The first member 491 and the second member 492 may also be caulked. The second member 492 and the third member 493 are electrically connected by being made of a clad material.

[0183] The negative terminal 490A may be formed by recessing the first member 491 in a direction away from the bus bar 10 similarly to the negative terminal 440 of the third embodiment. The negative terminal 490A may be formed by protruding the first member 491 toward the bus bar 20 beyond the facing surface P of the bus bar 20 similarly to the negative terminal 460 of the fifth embodiment.

[0184] (Structure of negative terminal 490B)

[0185] For the structure of the negative electrode terminal 490B of the modification of the eighth embodiment, refer to Fig.25 Provide explanation. Fig.25 It is a perspective view showing a negative electrode terminal 490B according to a modification of the eighth embodiment in cross section.

[0186] The negative terminal 490B is an electrode terminal. For the negative terminal 490B, the same structure as the negative terminal 420 and the negative terminal 490A is assigned the same reference numerals as the negative terminal 420 and the negative terminal 490A, and the description thereof is omitted. For the negative terminal 490B, the structure different from the negative terminal 420 and the negative terminal 490A is assigned different reference numerals as the negative terminal 420 and the negative terminal 490A, and the description thereof is omitted.

[0187] Negative terminal 490A Fig.25 As shown, the second component 494 includes a first component 421, a second component 494 and a third component 493. The second component 494 is formed by changing the shape of the second component 492. The outer shape of the second component 494 is formed into a plate shape including the outer shapes of the second components 492. The inner shape of the second component 494 is similar to Fig.13 The second member 422 shown is the same. The second member 494 has an opposing portion 494 a that is opposed to the bus bar 10 along the height direction Z of the battery 1 .

[0188] (Effects of negative terminal 490A and negative terminal 490B)

[0189] For the effects of the negative electrode terminal 490A and the negative electrode terminal 490B in the eighth embodiment, refer to Figure 23 to Figure 25 Provide explanation.

[0190] In the negative terminal 490A, the first component 491 and the third component 493 are not riveted together. With such a structure, the negative terminal 490A can be prevented from being affected by physical deformation of the first component 491 and the third component 493. In the negative terminal 490B, the first component 421 and the third component 493 are not riveted together. With such a structure, the negative terminal 490B can be prevented from being affected by physical deformation of the first component 421 and the third component 493.

[0191] (Negative Electrode Terminal of Ninth Embodiment)

[0192] (Structure of negative terminal)

[0193] The structure of the negative electrode terminal of the ninth embodiment is equivalent to that of the first to eighth embodiments except that Fig. 20 The structures of all embodiments except the structure of the fifth embodiment shown.

[0194] The electrode terminal is applied to, for example, Fig.16 The structure of the first component 421, the second component 422, and the third component 423 of the first embodiment shown in FIG. The first component 421 does not protrude toward the bus bar 10 side compared to the third component 423 on the side of the surface P facing the bus bar 10. Here, the first component 421 of the negative terminal is provided on the same plane as the third component 423 on the side of the surface P facing the bus bar 10. The same plane is defined in consideration of the allowable error in manufacturing of the outer shapes of the first component 421 and the third component 423. That is, the same plane includes the case where the first component 421 protrudes by several μm to several hundred μm compared to the third component 423. Similarly, the same plane includes the case where the third component 423 protrudes by several μm to several hundred μm compared to the first component 421. The positional relationship between the first component 421 and the third component 423 is defined on the same plane so that the third component 423 and the bus bar 10 can be joined in a state of at least partial contact. The third component 423 and the bus bar 10 are joined across the first component 421. The third member 423 is joined to the bus bar 10 across the second member 422 .

[0195] Likewise, the electrode terminal is applied to, for example, Fig.23 and Fig.24The structure of the first component 491, the second component 492 and the third component 493 of the eighth embodiment shown. The first component 491 does not protrude toward the bus bar 10 side compared to the third component 493 on the side of the surface P facing the bus bar 10. Here, the first component 491 of the negative terminal is provided on the same surface as the third component 493 on the side of the surface P facing the bus bar 10. The same surface is stipulated in consideration of the allowable error in manufacturing of the outer shapes of the first component 491 and the third component 493. The third component 493 is joined to the bus bar 10 across the first component 491. The third component 493 is joined to the bus bar 10 across a pair of second components 492. A structure in which the third component 493 is joined to the bus bar 10 across the second component 492 of one of the pair of second components 492 may also be adopted.

[0196] (Effect of negative terminal)

[0197] The effect of the negative electrode terminal of the ninth embodiment will be described.

[0198] The negative terminal realizes the first to eighth embodiments except Fig. 20 Effects of a part or all of the embodiments other than the fifth embodiment shown.

[0199] (Other Embodiments of Negative Electrode Terminal and Battery)

[0200] The battery of the present invention is not limited to the structure described in the embodiment, and can be appropriately configured based on the contents described in the claims.

[0201] The electrode terminal of the present invention can be configured by arbitrarily combining the structures of the electrode terminals of the first to eighth embodiments.

[0202] The electrode terminal of the present invention is not limited to the negative terminal. The electrode terminal of the present invention can also be applied to the positive terminal. According to such a structure, the positive terminal 410, which is converted from a material containing aluminum to a material containing copper, can be fully connected to the bus bar containing copper.

[0203] The battery of the present invention is not limited to a lithium ion battery. The battery of the present invention can be applied to a nickel-hydrogen battery or a lead battery, for example. The battery of the present invention is not limited to a secondary battery. The battery of the present invention can be applied to a primary battery. The charge and discharge body of the battery of the present invention is not limited to a winding type charge and discharge body formed by bundling and winding the positive electrode, separator and negative electrode respectively formed in a long shape. As the charge and discharge body of the battery of the present invention, a stacked type in which the positive electrode, separator and negative electrode respectively formed in a rectangular shape are stacked alternately can be applied. As the charge and discharge 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 in a relatively short shape are opposed to each other and alternately arranged with a separator for a single separator formed in a long shape can be applied. The charge and discharge body of such a structure is formed by folding and stacking the separator, and the positive electrode and the negative electrode are opposed to each other with a separator. The battery of the present invention is not limited to a structure in which one charge and discharge body is set. The battery of the present invention can be applied to a structure in which two or more charge and discharge bodies are set. The battery of the present invention is not limited to a structure in which the charge and discharge body is sealed with a container and a cover. The battery of the present invention can be applied to a structure in which a charge and discharge body is sealed with a laminate film.

[0204] Explanation of symbols

[0205] 1 battery, 10 bus bar (conductive component), 20 bus bar (conductive component), 20a recess, 100 charging and discharging body, 400 electrode terminal, 410 positive terminal (electrode terminal), 420 negative terminal (electrode terminal), 420b insertion portion, 421 first component, 421a head portion, 421a1 facing portion, 421a2 peripheral portion, 421b main body portion, 421b1 peripheral portion, 421c

[0206] foot, 422 second component, 422a first insertion portion, 423 third component, 423a opposite portion, 423b second insertion portion, 430 negative terminal (electrode terminal), 431a head, 440 negative terminal (electrode terminal), 441 first component, 441a head, 442 second component, 450 negative terminal (electrode terminal), 451 first component, 451a head, 451a3 recess, 453 third component, 460 negative terminal (electrode terminal), 461 first component, 461a head, 470 negative terminal (electrode terminal), 480 negative terminal (electrode terminal), 482 second component, 4 82b step portion, 483 third component, 490A negative terminal (electrode terminal), 490B negative terminal (electrode terminal), 491 first component, 491a head, 491a1 opposing portion, 491a2 outer portion, 492 second component, 492a opposing portion, 492b, 493 third component, 493a opposing portion, 493b recessed portion, 493c inserted portion, 494 second component, 494a opposing portion, P opposing surface of bus bar 10 or bus bar 20, Q non-opposing surface, S welding portion, T welding portion, U welding portion, X long side direction of battery 1, Y short side direction of battery 1, Z height direction of battery 1.

Claims

1. An electrode terminal, characterized in that: have: A first component, which is electrically connected to a charging and discharging body of the battery and contains a first metal; A second component having a first insertion portion into which the first component is inserted, joined to the first component, and containing the first metal; and a third component having a second insertion portion into which the first component is inserted, joined to the second component, and containing a second metal different from the first metal; The third member is bonded to the conductive member on a surface facing the conductive member that electrically connects one of the batteries to the other batteries and includes the second metal. The first component and the third component are adjacent to each other on one side of the facing surface.

2. The electrode terminal according to claim 1, wherein: The first component is laser bonded to the second component.

3. The electrode terminal according to claim 2, wherein: The first member and the second member are joined from the facing surface side.

4. The electrode terminal according to claim 2, wherein: The first member and the second member are joined from a non-opposing surface side opposite to the opposing surface.

5. The electrode terminal according to claim 1, wherein: The first component and the third component are arranged on the same surface as the third component on one side of the facing surface.

6. The electrode terminal according to claim 1, wherein: The first member is partially recessed relative to the facing surface in a direction away from the conductive member.

7. The electrode terminal according to claim 6, wherein: The first member and the second member are laser-bonded from the facing surface side at a portion where the first member is partially recessed.

8. The electrode terminal according to claim 1, wherein: The first component and the third component are separated in a stacking direction of the first component and the second component.

9. The electrode terminal according to claim 1, wherein: The third member is joined to the conductive member at two or more locations across the first member.

10. The electrode terminal according to claim 1, wherein: The first component is riveted to the second component.

11. The electrode terminal according to claim 1, wherein: The second component and the third component are formed of a cladding material.

12. The electrode terminal according to claim 1, wherein: The first metal is copper or a copper alloy; The second metal is aluminum or an aluminum alloy; Apply it to the negative terminal.

13. The electrode terminal according to claim 1, wherein: The first component protrudes beyond the facing surface in a direction approaching the conductive component; The conductive component has a recessed portion for accommodating the first component on the facing surface side.

14. A battery, characterized in that: have: The electrode terminal according to claim 1; and A charging and discharging body electrically connected to the electrode terminal.

15. An electrode terminal, characterized in that: have: A first component, which is electrically connected to a charging and discharging body of the battery and contains a first metal; a second component, which is bonded to the first component and contains the first metal; and a third component, which is bonded to the second component and contains a second metal different from the first metal, The third component is not riveted to the first component, The third member is bonded to the conductive member on a surface facing the conductive member that electrically connects one of the batteries to the other batteries and includes the second metal. The first component, the second component, and the third component are adjacent to each other on one side of the facing surface.

16. An electrode terminal, characterized in that: have: A first component, which is electrically connected to a charging and discharging body of the battery and contains a first metal; a second component, which is bonded to the first component and contains the first metal; and a third component, which is bonded to the second component and contains a second metal different from the first metal, The third member is bonded to the conductive member on a surface facing the conductive member that electrically connects one of the batteries to the other batteries and includes the second metal. The first component protrudes toward the conductive component side more than the third component on the opposite surface side. The third component is joined to the conductive component across the first component.

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