battery

Abstract

A charge / discharge body (100) comprising a positive electrode, a negative electrode, and an insulating member stacked between the positive and negative electrodes, a positive conductive member, and a negative conductive member. The insulating member is insulating. The positive electrode has a positive current collector and multiple tabs protruding from the positive current collector, i.e., multiple positive tabs. The negative electrode has a negative current collector and multiple tabs protruding from the negative current collector, i.e., multiple negative tabs (121b). The multiple positive tabs are bonded to the positive conductive member in a bundled state. The multiple negative tabs (121b) are bonded to the negative conductive member in a bundled state. At least one of the multiple positive tabs and the multiple negative tabs (121b) includes a tab wider than the tab on one side of the charge / discharge body (100), on the outer or inner side.

Description

Technical Field

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

[0002] A battery is known to have a charging / discharging body (electrode body) with tabs and a conductive member (current collector) connected to the tabs (see, for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2024-53888 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] A battery that requires the tabs to be fully engaged with conductive components such as current collectors and electrode terminals.

[0008] Methods for solving problems

[0009] One aspect of the present invention provides a battery comprising: a charge / discharge body formed by stacking a positive electrode, a negative electrode, and an insulating member disposed between the positive electrode and the negative electrode; a positive electrode conductive member and a negative electrode conductive member; the insulating member being insulating; the positive electrode having a positive current collector and a plurality of tabs protruding from the positive current collector, i.e., a plurality of positive electrode tabs; the negative electrode having a negative current collector and a plurality of tabs protruding from the negative current collector, i.e., a plurality of negative electrode tabs; the plurality of positive electrode tabs being bonded to the positive electrode conductive member in a bundled manner; and at least one of the plurality of positive electrode tabs and the plurality of negative electrode tabs including a tab wider than the tab on the other side of the charge / discharge body, on one side of the outer and inner sides of the charge / discharge body.

[0010] The effects of the invention

[0011] According to the present invention, a battery in which the tabs and conductive components are fully engaged can be obtained. Attached Figure Description

[0012] Figure 1 This is a perspective view of the battery 1 according to the first embodiment.

[0013] Figure 2 This is a three-dimensional view showing the components surrounding the negative terminal 420 of battery 1, represented by a cross-section.

[0014] Figure 3 It means Figure 2 A side view of the constituent components.

[0015] Figure 4This is a three-dimensional view showing the components surrounding the positive terminal 410 of battery 1, represented by a cross-section.

[0016] Figure 5 It means Figure 4 A side view of the constituent components.

[0017] Figure 6 It is a 3D view of battery 1, partially decomposed.

[0018] Figure 7 This is a three-dimensional view representing the charging and discharging body 100 of battery 1.

[0019] Figure 8 Represented by cross section Figure 7 A side view of a portion of the charging / discharging body 100.

[0020] Figure 9 This is a side view of a portion of the modified charge / discharge body 1100, shown in cross-section.

[0021] Figure 10 This is a perspective view showing the components surrounding the negative terminal 420 of battery 1.

[0022] Figure 11 This is a perspective view showing the components surrounding the crack valve 530 and sealing plug 540 of battery 1.

[0023] Figure 12 It is a perspective view showing the components surrounding the positive terminal 410 of battery 1.

[0024] Figure 13 This is a perspective view of the charge / discharge body 100 of the first embodiment, and of the charge / discharge body 100 in a state in which the plurality of negative electrode tabs 121b have not shifted in position.

[0025] Figure 14 This is a perspective view of the charge / discharge body 100 of the first embodiment, and of the charge / discharge body 100 in a state in which the plurality of negative electrode tabs 121b have not shifted in position.

[0026] Figure 15 This is a perspective view showing the junction of multiple negative electrode tabs 121b and negative electrode current collector 220.

[0027] Figure 16A This is a planar schematic diagram of a charge / discharge body 100 in which multiple negative electrode tabs 121b have not shifted in position.

[0028] Figure 16B This is a planar schematic diagram of a charge / discharge body 100 in which multiple negative electrode tabs 121b are shifted in position.

[0029] Figure 17AThis is a plan view of the charge / discharge body 1000 of the comparative example of this embodiment, in which the multiple negative electrode tabs 1021b have not shifted in position.

[0030] Figure 17B This is a plan view of the charge / discharge body 1000 of a comparative example of this embodiment, in which the positions of multiple negative electrode tabs 1021b are shifted.

[0031] Figure 18 This is a perspective view of the charge / discharge body 800 of the second embodiment, and of the charge / discharge body 800 in a state in which the plurality of negative electrode tabs 821b have not shifted position.

[0032] Figure 19 This is a perspective view of the charge / discharge body 800 of the second embodiment, and of the charge / discharge body 800 in a state where the positions of the plurality of negative electrode tabs 821b are shifted.

[0033] Figure 20 This is a perspective view of the charge / discharge body 900 of the third embodiment, and of the charge / discharge body 900 in a state in which the plurality of negative electrode tabs 121b have not shifted position.

[0034] Figure 21 This is a perspective view of the charge / discharge body 900 of the third embodiment, and of the charge / discharge body 900 in a state where the positions of the plurality of negative electrode tabs 121b are shifted. Detailed Implementation

[0035] Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. To facilitate understanding of each embodiment, the size and proportions of the constituent components are sometimes exaggerated in the drawings. The same symbols are used for the same components in each drawing. Arrows are used to indicate the length direction X, width direction Y, and height direction Z of the battery 1 in each drawing. The length direction X, width direction Y, and height direction Z of the battery 1 in each drawing indicate their relative positional relationship within the same drawing. That is, when the battery 1 is rotated 180 degrees to reverse its top and bottom orientation, or when the battery 1 is rotated 90 degrees to have its top positioned as a side, the length direction X, width direction Y, and height direction Z of the battery 1 change.

[0036] (The configuration of battery 1 in the first embodiment)

[0037] Reference Figures 1 to 16B Explain the composition of battery 1.

[0038] Figure 1 This is a perspective view of the battery 1 according to the first embodiment. Figure 2 This is a three-dimensional view showing the components surrounding the negative terminal 420 of battery 1, represented by a cross-section. Figure 3 It means Figure 2A side view of the constituent components. Figure 4 This is a three-dimensional view showing the components surrounding the positive terminal 410 of battery 1, represented by a cross-section. Figure 5 It means Figure 4 A side view of the constituent components. Figure 6 It is a 3D view of battery 1, partially decomposed. Figure 7 This is a three-dimensional view representing the charging and discharging body 100 of battery 1. Figure 8 Represented by cross section Figure 7 A side view of a portion of the charging / discharging body 100. Figure 9 This is a side view of a portion of the charge / discharge body 1100, which is a modified example shown in cross-section. Figure 10 This is a perspective view showing the components surrounding the negative terminal 420 of battery 1. Figure 11 This is a perspective view showing the components surrounding the crack valve 530 and sealing plug 540 of battery 1. Figure 12 It is a perspective view showing the components surrounding the positive terminal 410 of battery 1.

[0039] The battery 1 includes: a charge / discharge body 100 for charging and discharging electricity, a current collector 200 connected to the charge / discharge body 100, a current blocking body 300 connected to the current collector 200, an electrode terminal 400 connected to the current collector 200 or the current blocking body 300, an outer casing 500 that houses or mounts the constituent components of the battery 1, an insulator 600 that insulates the constituent components of the battery 1 and the outer casing 500, and a sealing body 700 that seals the constituent components of the battery 1 and the outer casing 500.

[0040] The charging and discharging body 100 charges and discharges the electricity. 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 constructed by winding a structural member (sheet structure) formed by stacking a strip-shaped positive electrode 110, a strip-shaped first separator 130, a strip-shaped negative electrode 120, and a strip-shaped second separator 130 into a cuboid shape.

[0041] The positive electrode 110 includes an elongated positive electrode current collector layer 111 and a positive electrode active material layer 112 bonded to both sides of the positive electrode current collector layer 111. The positive electrode current collector layer 111 includes a positive electrode current collector (positive electrode current collector foil) 111a and multiple tabs (hereinafter also referred to as positive electrode tabs 111b). The positive electrode active material layer 112 is bonded to the positive electrode current collector 111a. Figure 8As shown, the positive electrode active material layer 112 is, for example, opposite to the entire width-direction region of the positive electrode current collector 111a. The positive electrode tab 111b protrudes from the length-direction side edge 111c of the positive electrode current collector 111a towards the width direction of the positive electrode current collector 111a. The positive electrode tab 111b is integrally formed with the positive electrode current collector 111a. Multiple positive electrode tabs 111b are formed on a single positive electrode current collector 111a. The positive electrode 110 may also be configured such that the positive electrode active material layer 112 is bonded only to one side of the positive electrode current collector layer 111. The positive electrode current collector layer 111 is, for example, formed 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 conductive additives. In the lithium-containing composite oxide, for example, metallic elements such as nickel (Ni), cobalt (Co), and manganese (Mn) and lithium (Li) are used.

[0042] The negative electrode 120 includes an elongated negative electrode current collector layer 121 and a negative electrode active material layer 122 bonded to both sides of the negative electrode current collector layer 121. The negative electrode current collector layer 121 includes a negative electrode current collector (negative electrode current collector foil) 121a and multiple tabs (hereinafter also referred to as negative electrode tabs 121b). Figure 8 As shown, the negative current collector 121a of the negative electrode 120 is wider in the width direction than the positive current collector 111a of the positive electrode 110. The two ends of the positive current collector 111a of the positive electrode 110 are located within the width direction of the negative current collector 121a of the negative electrode 120, separated by a separator 130. A negative active material layer 122 is bonded to the negative current collector 121a. The negative active material layer 122 faces, for example, the entire width direction of the negative current collector 121a. A negative electrode tab 121b protrudes from the side edge 121c of the negative current collector 121a in the length direction toward the width direction of the negative current collector 121a. The negative electrode tab 121b, when stacked with the positive electrode 110 separated by the separator 130, protrudes in the same direction as the positive electrode tab 111b of the positive electrode 110. The negative electrode tab 121b is separated from the positive electrode tab 111b of the positive electrode 110 while being stacked with the positive electrode 110 through the separator 130. The negative electrode tab 121b is integrally formed with the negative current collector 121a. Multiple negative electrode tabs 121b are formed on a single negative current collector 121a. The negative electrode 120 may also be configured such that the negative electrode active material layer 122 is bonded to only one side of the negative current collector layer 121. The negative current 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 conductive additives. For example, graphite is used as the carbon-based material.

[0043] The separator 130 is an insulating component with insulating properties. The separator 130 is disposed between the positive electrode 110 and the negative electrode 120. The separator 130 allows lithium ions to pass through while insulating the positive electrode 110 and the negative electrode 120. The separator 130 is formed in an elongated strip shape. Figure 8 As shown, the separator 130 is wider in the width direction than the positive current collector 111a of the positive electrode 110 and the negative current collector 121a of the negative electrode 120. Both ends of the positive current collector 111a of the positive electrode 110 are located within the width direction of the separator 130, and both ends of the negative current collector 121a of the negative electrode 120 are located within the width direction of the separator 130. The separator 130 is made of a porous material. The separator 130 may be made of polyethylene (PE) or polypropylene (PP). Alternatively, a different insulating member may be used instead of the separator 130. The insulating member may also be located on the side of the positive electrode 110 opposite to the negative electrode 120. The insulating member may also be located on the side of the negative electrode 120 opposite to the positive electrode 110. The insulating member may also be a heat-resistant member. In this configuration, the separator 130 is not necessary.

[0044] Electrolyte 140 allows lithium ions to flow between positive electrode 110 and negative electrode 120. Electrolyte 140 is also referred to as an electrolyte. Electrolyte 140 contains a solvent and a solute. Electrolyte 140 may contain additives. The solvent may include, for example, an organic solvent. An organic solvent may be a carbonate such as ethylene carbonate. The solute may include, for example, a lithium salt. A lithium salt may be, for example, lithium hexafluorophosphate (LiPF6).

[0045] Reference Figure 9 This describes a modified example of the charge / discharge body 100, namely, the charge / discharge body 1100. The configuration of the positive electrode 1110 of the charge / discharge body 1100 differs from that of the positive electrode 110 of the charge / discharge body 100. In the configuration of the charge / discharge body 1100, the same reference numerals are used for configurations identical to those in the charge / discharge body 100, and their descriptions are omitted. The positive electrode active material layer 1112 of the charge / discharge body 1100 is opposite to the portion of the positive electrode current collector 111a, excluding both ends in the width direction. The heat-resistant insulating layer 1113 of the charge / discharge body 1100 is bonded to both ends of the positive electrode current collector 111a in the width direction and to the base portion of the positive electrode tab 111b.

[0046] Thus, the charging and discharging bodies 100 and 1100 are wound bodies formed by at least the positive electrode 110, 1110 and the negative electrode 120 being wound with an insulating member (partition 130) in between.

[0047] The current collector 200 is connected to the charge / discharge body 100. The current collector 200 is also called a current collector plate. The current collector 200 is a conductive component that electrically connects the charge / discharge body 100 and the electrode terminal 400. Figures 2 to 5 , Figure 10 and Figure 12 The current collector 200 shown includes a positive current collector plate 210 and a negative current collector plate 220.

[0048] The positive current collector 210 is a positive conductive member that enables the positive electrode tab 111b and the positive terminal 410 of the charging / discharging body 100 to conduct electricity via the current blocking body 300. The positive current collector 210 includes a first base 210a in the shape of a cuboid plate, a second base 210b in the shape of a cuboid plate, and a connecting portion 210c that connects the first base 210a and the second base 210b at different stepped heights. A recess 210d is formed on the upper surface of the second base 210b, thinning the thickness of the second base 210b. A fragile portion 210e, recessed into a ring shape and partially fragile, is formed in the center of the recess 210d. The positive current collector 210 is made of, for example, aluminum or an aluminum alloy.

[0049] The negative current collector 220 is a negative conductive member that connects the negative electrode tab 121b and the negative terminal 420 of the charging / discharging body 100. The negative current collector 220 includes a cuboid plate-shaped base 220a and an insertion hole 220b penetrating the base 220a. The insertion portion 420b of the negative terminal 420 is inserted into the insertion hole 220b of the negative current collector 220. The negative current collector 220 is formed, for example, of copper or a copper alloy.

[0050] When the internal pressure of the battery 1 is within a specified value, the current interruptor 300 maintains its connection with the positive current collector 210, thereby maintaining the current path between the current collector 200 and the positive terminal 410. Conversely, when the internal pressure of the battery 1 exceeds the specified value and rises, the current interruptor 300 separates from the positive current collector 210, opening the current path between the current collector 200 and the positive terminal 410, thus interrupting the current path between the current collector 200 and the positive terminal 410. The current interruptor 300 is also called a current interrupt device (CID). The current interruptor 300 is not a necessary component in the battery 1. Figure 4 , Figure 5 and Figure 12 The current blocking body 300 shown includes a diaphragm 310, a conducting member 320, and a pair of support platforms 330.

[0051] The separator 310 includes a curved cylindrical body portion 310a, a disc-shaped first joint portion 310b disposed at the top end of the body portion 310a, and an annular second joint portion 310c disposed at the base end of the body portion 310a. The first joint portion 310b engages with the recess 210d of the positive current collector plate 210. The second joint portion 310c engages with the conductive member 320. When the internal pressure of the battery 1 exceeds a predetermined value and rises, the first joint portion 310b of the separator 310, together with the recess 210d of the positive current collector plate 210, deforms and cracks outward from the battery 1. As a result, the separator 310 separates from the positive current collector plate 210. Therefore, the current path between the current collector 200 and the positive terminal 410 is cut off. The separator 310 is formed, for example, of aluminum or an aluminum alloy.

[0052] The conductive member 320 is formed in a cylindrical shape. The conductive member 320 includes a disc-shaped base 320a and an insertion hole 320b with a central opening in the base 320a. A positive electrode side insulating plate 620 is joined to the upper surface of the conductive member 320. The outer edge of the lower surface of the conductive member 320 is joined to the second joint portion 310c of the diaphragm 310. The conductive member 320 is formed, for example, of aluminum or an aluminum alloy.

[0053] The support platform 330 includes a cuboid-shaped main body 330a extending along the width direction of the battery 1, and legs 330b extending downward from both sides along the length direction of the main body 330a. One support platform 330 is provided at each end of the separator 310 along the length direction of the battery 1. The main body 330a is mounted on the positive electrode side insulating plate 620. The legs 330b are mounted on the second base 210b of the positive electrode current collector 210. The support platform 330 is formed, for example, of insulating resin.

[0054] A plug 340 is disposed in the through portion 410d of the positive terminal 410. The plug 340 disengages from the through portion 410d when the internal pressure of the battery 1 increases. Specifically, when the separator 310 deforms outward of the battery 1 and the pressure in the space between the separator 310 and the positive terminal 410 increases, the plug 340 is discharged from the through portion 410d of the positive terminal 410 to the outside of the battery. The plug 340 is formed of resin and molded in the through portion 410d of the positive terminal 410.

[0055] Electrode terminal 400 is connected to current collector 200 or current blocking body 300. Figures 1 to 6 , Figure 10 and Figure 12 The electrode terminal 400 shown includes a positive terminal 410 and a negative terminal 420.

[0056] Positive extreme 410, for example Figure 5 As shown, the conductive member 320 is connected to the current blocking body 300. (As indicated...) Figure 4 , Figure 5and Figure 12 As shown, the positive terminal 410 includes a cuboid plate-shaped base 410a, and extending from the base 410a towards... Figure 4 The cylindrical insertion portion 410b protruding below, and the portion extending from the outer periphery of the base 410a towards... Figure 4 The lower part of the positive terminal 410 has a protruding cylindrical joint 410c. The positive terminal 410 includes a through portion 410d that passes through the base 410a and the insertion portion 410b. The base 410a contacts the base 720a of the positive side second pad 720. The insertion portion 410b is inserted into the insertion hole 720b of the positive side second pad 720, the positive side insertion hole 520a of the cover 520, the insertion hole 620b of the positive side insulating plate 620, and the insertion hole 320b of the conductive member 320. Figure 5 and Figure 12 As shown, the joint 410c protrudes downward from the insertion hole 320b of the conductive member 320 and extends radially outward to engage with the conductive member 320. That is, the joint 410c is riveted to the conductive member 320. Alternatively, the joint 410c is welded to the conductive member 320. A plug 340 of the current blocking body 300 is inserted into the through portion 410d. In this configuration, the busbar engaging with the positive terminal 410 has a through hole to prevent interference with the plug 340. Alternatively, in this configuration, the busbar engaging with the positive terminal 410 is configured to prevent interference with the plug 340. On the other hand, if the current blocking body 300 is not provided on the battery 1, it is not necessary to provide the through portion 410d on the positive terminal 410. That is, if the current blocking body 300 is not provided on the battery 1, the busbar engaging with the positive terminal 410 may not have a through hole. The positive terminal 410 is formed, for example, from aluminum or an aluminum alloy.

[0057] negative extreme 420, for example Figure 3 As shown, it is connected to the negative current collector 220. Figure 3 and Figure 10 As shown, the negative terminal 420 includes a cuboid plate-shaped base 420a, and extending from the base 420a towards... Figure 3 The cylindrical insertion portion 420b protruding below, and the portion extending from the outer periphery of the base 420a towards... Figure 3 The lower part has a protruding cylindrical joint 420c. The base 420a contacts the base 740a of the second pad 740 on the negative electrode side. The insertion part 420b is inserted into the insertion hole 740b of the second pad 740 on the negative electrode side, the insertion hole 520b of the cover 520 on the negative electrode side, the insertion hole 630b of the insulating plate 630 on the negative electrode side, and the insertion hole 220b of the current collector plate 220. Figure 3 and Figure 10As shown, the joint 420c protrudes downward from the insertion hole 220b of the negative current collector plate 220 and extends radially outward to engage with the negative current collector plate 220. That is, the joint 420c is riveted to the negative current collector plate 220. Alternatively, the joint 420c is welded to the negative current collector plate 220. The negative terminal 420 is, for example, formed of copper or a copper alloy.

[0058] The outer casing 500 contains or mounts the battery 1. Figures 1 to 6 and Figures 10 to 12 The outer casing 500 shown includes a container 510, a cap 520, a burst valve 530, and a sealing plug 540.

[0059] Container 510 contains a charging / discharging body 100, etc. Container 510 is constructed of a rectangular metal can. Container 510 includes an opening 510a along its length and a receiving portion 510b connected to the opening 510a. Container 510 is, for example, made of aluminum or an aluminum alloy.

[0060] The cap 520 seals the opening 510a of the container 510. The container 510 is formed of a long, plate-shaped metal plate. A positive electrode insertion hole 520a, consisting of a circular through-hole, is formed on one end of the cap 520 in the longitudinal direction X. The insertion portion 410b of the positive terminal 410 and the first positive electrode gasket 710 of the sealing body 700 are inserted into the positive electrode insertion hole 520a. A negative electrode insertion hole 520b, consisting of a circular through-hole, is formed on the other end of the cap 520 in the longitudinal direction X. The insertion portion 420b of the negative terminal 420 and the first negative electrode gasket 730 of the sealing body 700 are inserted into the negative electrode insertion hole 520b. A liquid injection insertion hole 520c, consisting of a circular through-hole, is formed between the positive electrode insertion hole 520a and the negative electrode insertion hole 520b on the cap 520. An insertion portion 540b, into which a sealing plug 540 is inserted, is inserted into an insertion hole 520c for liquid injection. The cap 520 is welded to the container 510. The cap 520 is, for example, formed of aluminum or an aluminum alloy.

[0061] like Figure 11 As shown, a crack valve 530 is provided on the cover 520. When the internal pressure of the battery 1 reaches a predetermined value, the crack valve 530 cracks outwards from the battery, causing the internal pressure of the battery 1 to become atmospheric pressure. The crack valve 530 is, for example, formed in a circular shape. The crack valve 530 is thinner than the cover 520. The crack valve 530 has a groove forming a crack reference. The crack valve 530 is integrally formed with the cover 520. Alternatively, the crack valve 530 can be separately formed from the cover 520 and then annularly welded to a through hole provided on the cover 520.

[0062] like Figure 6 As shown, the sealing plug 540 has an injection insertion hole 520c for the sealing cap 520. The sealing plug 540 is formed in a cylindrical shape. Figure 11 As shown, the sealing plug 540 includes a head 540a with a relatively large outer diameter and an insertion portion 540b that is continuous with the head 540a and has a relatively small outer diameter. The head 540a of the sealing plug 540 is welded to the cap 520. The insertion portion 540b is inserted into an injection hole 520c. The sealing plug 540 is formed, for example, of aluminum or an aluminum alloy.

[0063] Insulator 600 insulates the constituent components of battery 1 from the outer casing 500. Figures 2 to 5 , Figure 10 and Figure 12 The insulator 600 shown includes an insulating cover 610, a positive-side insulating plate 620, and a negative-side insulating plate 630.

[0064] An insulating cover 610 covers the charging / discharging body 100. The insulating cover 610 exposes one side 100a of the charging / discharging body 100 outwards and covers the portion of the charging / discharging body 100 other than one side 100a. The insulating cover 610 is, for example, formed in a pentahedral shape and folded into a box shape. The insulating cover 610 is, for example, formed of polypropylene.

[0065] The positive electrode side insulating plate 620 insulates the positive electrode current collector 210 and the conductive member 320 from the cover 520. The positive electrode side insulating plate 620 includes a cuboid plate-shaped base 620a, an insertion hole 620b penetrating the base 620a, and a protrusion 620c annularly surrounding the side edge of the base 620a and protruding away from the cover 520. The positive electrode current collector 210 and the conductive member 320 are housed within the space formed by the base 620a and the protrusion 620c in the positive electrode side insulating plate 620. An insertion portion 410b of the positive terminal 410 is inserted into the insertion hole 620b. The positive electrode side insulating plate 620 is formed, for example, of an insulating resin.

[0066] The negative electrode side insulating plate 630 insulates the negative electrode current collector 220 from the cover 520. The negative electrode side insulating plate 630 includes a cuboid plate-shaped base 630a, an insertion hole 630b penetrating the base 630a, and a protrusion 630c annularly surrounding the side edge of the base 630a and protruding away from the cover 520. The negative electrode current collector 220 is housed in the space formed by the base 630a and the protrusion 630c within the negative electrode side insulating plate 630. The insertion portion 420b of the negative terminal 420 is inserted into the insertion hole 630b. The negative electrode side insulating plate 630 is formed, for example, of insulating resin.

[0067] The sealing body 700 is a component of the sealed battery 1 and the outer casing 500. Figures 2 to 5 , Figure 10 and Figure 12 The sealing body 700 shown includes a first gasket 710 on the positive electrode side, a second gasket 720 on the positive electrode side, a first gasket 730 on the negative electrode side, and a second gasket 740 on the negative electrode side.

[0068] The first gasket 710 on the positive electrode side seals the positive current collector 210 and the cover 520, thereby sealing the outer casing 500. The first gasket 710 on the positive electrode side is formed in a cylindrical shape. Figure 12 As shown, the first pad 710 on the positive electrode side 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 passes through the first insertion portion 710a and the second insertion portion 710b. Figure 5 As shown, the first gasket 710 on the positive side is disposed between the positive terminal 410 and the positive current collector 210. The first insertion part 710a is inserted into... Figure 12 The second insertion part 710b is inserted into the insertion hole 620b of the positive electrode side insulating plate 620 shown. Figure 12 The positive electrode side insertion hole 520a of the cover 520 and the positive electrode side insertion hole 720b of the second gasket 720 are shown. An insert is placed in the insertion hole 710c. Figure 12 The insertion portion 410b of the positive terminal 410 is shown. The first gasket 710 on the positive terminal side is formed, for example, of rubber that has insulation and elasticity.

[0069] The second gasket 720 on the positive side seals the positive terminal 410 and the cap 520. (Example) Figure 12 As shown, the second positive electrode side gasket 720 includes a cuboid plate-shaped base 720a, an insertion hole 720b penetrating the base 720a, and a protrusion 720c annularly surrounding the side edge of the base 720a and protruding in a direction away from the cover 520. In the second positive electrode side gasket 720, a positive terminal 410 is housed in the space formed by the base 720a and the protrusion 720c. An insertion portion 410b of the positive terminal 410 is inserted into the insertion hole 720b. The second positive electrode side gasket 720 is formed, for example, of an insulating resin.

[0070] The first gasket 730 on the negative electrode side seals the negative electrode current collector 220 and the cover 520, thereby sealing the outer casing 500. The first gasket 730 on the negative electrode side is formed in a cylindrical shape. Figure 10 As shown, the first pad 730 on the negative electrode side includes a first insertion portion 730a with a relatively large outer diameter, a second insertion portion 730b that is continuous with the first insertion portion 730a and has a relatively small outer diameter, and an insertion hole 730c that passes through the first insertion portion 730a and the second insertion portion 730b. Figure 3 As shown, the first gasket 730 on the negative side is disposed between the second member 422 of the negative terminal 420 and the negative current collector 220. The first insertion part 730a is inserted into... Figure 10 The second insertion part 730b is inserted into the insertion hole 630b of the negative electrode side insulating plate 630 shown. Figure 10The negative electrode side insertion hole 520b of the cover 520 and the negative electrode side insertion hole 740b of the second gasket 740 are shown. An insert is placed in the insertion hole 730c. Figure 10 The main body 421b of the first component 421 of the negative terminal 420 shown. The first gasket 730 on the negative terminal side is formed, for example, of rubber that has insulation and elasticity.

[0071] The second gasket 740 on the negative electrode side seals the negative terminal 420 and the cap 520. (Example) Figure 10 As shown, the negative electrode side second gasket 740 includes a cuboid plate-shaped base 740a, an insertion hole 740b penetrating the base 740a, and a protrusion 740c annularly surrounding the side edge of the base 740a and protruding in a direction away from the cover 520. In the negative electrode side second gasket 740, a negative terminal 420 is housed in the space formed by the base 740a and the protrusion 740c. The insertion portion 420b of the negative terminal 420 is inserted into the insertion hole 740b. The negative electrode side second gasket 740 is formed, for example, of an insulating resin.

[0072] Reference Figure 6 , Figure 7 and Figures 13 to 15 The structure of the electrodes (positive electrode 111b and negative electrode 121b) and the junction between the electrodes and the current collector 200 will be explained. Figure 6 and Figure 7 As shown, multiple positive electrode tabs 111b and multiple negative electrode tabs 121b protrude from one end of the winding portion of the charge / discharge body 100 toward the side facing the height direction Z of the battery 1. Furthermore, the height direction Z, length direction X, and width direction Y of the battery 1 will also be referred to as the height direction Z, length direction X, and width direction Y of the charge / discharge body 100 below.

[0073] The structure of the positive electrode tab 111b is the same as that of the negative electrode tab 121b. Furthermore, the connection structure between the positive electrode tab 111b and the positive current collector plate 210 is the same as that between the negative electrode tab 121b and the negative current collector plate 220. Therefore, the description will focus on the structure of the negative electrode tab 121b and the connection structure between the negative electrode tab 121b and the negative current collector plate 220, omitting the description of the structure of the positive electrode tab 111b and the connection structure between the positive electrode tab 111b and the positive current collector plate 210.

[0074] Figure 13 This is a three-dimensional view of the charge / discharge body 100 in a state where the multiple negative electrode tabs 121b have not shifted in position. Figure 14 This is a perspective view of a charge / discharge body 100 in which multiple negative electrode tabs 121b are displaced. The width of the charge / discharge body 100 along the length direction X of the negative electrode tabs 121b, i.e., the width along the winding direction of the charge / discharge body 100, is hereinafter referred to as the lateral width. Figure 13 and Figure 14As shown, the plurality of negative electrode tabs 121b include multiple negative electrode tabs 121b with different lateral widths. The plurality of negative electrode tabs 121b are configured such that their lateral width gradually increases from the outside to the inside of the charge / discharge body 100. That is, the plurality of negative electrode tabs 121b on the inside of the charge / discharge body 100 includes negative electrode tabs 121b with a lateral width wider than the negative electrode tabs 121b on the outside. In addition, the inside of the charge / discharge body 100 corresponds to the winding center axis side of the charge / discharge body 100. The outside of the charge / discharge body 100 corresponds to the outer peripheral surface side of the charge / discharge body 100.

[0075] The plurality of negative electrode tabs 121b have a first negative electrode tab 121b1 to a twelfth negative electrode tab 121b12. The first negative electrode tab 121b1 is disposed on the innermost side of the charge / discharge body 100 among the plurality of negative electrode tabs 121b. That is, the first negative electrode tab 121b1 is the negative electrode tab 121b closest to the beginning end of the winding of the sheet structure. The twelfth negative electrode tab 121b12 is disposed on the outermost side of the charge / discharge body 100 among the plurality of negative electrode tabs 121b. That is, the twelfth negative electrode tab 121b12 is the negative electrode tab 121b closest to the end end of the winding of the sheet structure.

[0076] Using the center plane Cp that bisects the charging / discharging body 100 in the width direction Y as a reference, a first negative electrode tab 121b1, a third negative electrode tab 121b3, a fifth negative electrode tab 121b5, a seventh negative electrode tab 121b7, a ninth negative electrode tab 121b9, and an eleventh negative electrode tab 121b11 are arranged on one side. Using the center plane Cp of the charging / discharging body 100 as a reference, a second negative electrode tab 121b2, a fourth negative electrode tab 121b4, a sixth negative electrode tab 121b6, an eighth negative electrode tab 121b8, a tenth negative electrode tab 121b10, and a twelfth negative electrode tab 121b12 are arranged on the other side.

[0077] The first negative electrode tab 121b1, the third negative electrode tab 121b3, the fifth negative electrode tab 121b5, the seventh negative electrode tab 121b7, the ninth negative electrode tab 121b9, and the eleventh negative electrode tab 121b11 are arranged in this order from the inside to the outside of the charging / discharging body 100. The second negative electrode tab 121b2, the fourth negative electrode tab 121b4, the sixth negative electrode tab 121b6, the eighth negative electrode tab 121b8, the tenth negative electrode tab 121b10, and the twelfth negative electrode tab 121b12 are arranged in this order from the inside to the outside of the charging / discharging body 100.

[0078] Figure 15 This is a perspective view showing the junction of multiple negative electrode tabs 121b and the negative electrode current collector 220. Figure 15 In the diagram, only three of the multiple negative electrode tabs 121b are represented. For example... Figure 15As shown, multiple negative electrode tabs 121b are bonded to the negative current collector plate 220 in a bundled and bent state. The multiple negative electrode tabs 121b are bonded to the negative current collector plate 220, for example, by laser beam welding. Furthermore, the protruding length of the multiple negative electrode tabs 121b is preferably set such that the top ends of the multiple negative electrode tabs 121b are aligned when they are bonded to the negative current collector plate 220.

[0079] Reference Figure 16A and Figure 16B The effects of this implementation method will be explained in detail. Figure 16A This is a planar schematic diagram of the charging / discharging body 100 in a state where the multiple negative electrode tabs 121b have not shifted in position, illustrating the configuration of the multiple negative electrode tabs 121b. For example... Figure 16A As shown, multiple negative electrode tabs 121b are formed such that their lateral width gradually increases from the outside to the inside of the charging / discharging body 100.

[0080] Specifically, the lateral width Be1 of the first negative electrode tab 121b1 and the second negative electrode tab 121b2 is wider than the lateral width Be2 of the third negative electrode tab 121b3 and the fourth negative electrode tab 121b4 (Be1>Be2). The lateral width Be2 of the third negative electrode tab 121b3 and the fourth negative electrode tab 121b4 is wider than the lateral width Be3 of the fifth negative electrode tab 121b5 and the sixth negative electrode tab 121b6 (Be2>Be3). The lateral width Be3 of the fifth negative electrode tab 121b5 and the sixth negative electrode tab 121b6 is wider than the lateral width Be4 of the seventh negative electrode tab 121b7 and the eighth negative electrode tab 121b8 (Be3>Be4). The lateral width Be4 of the 7th negative electrode tab 121b7 and the 8th negative electrode tab 121b8 is wider than the lateral width Be5 of the 9th negative electrode tab 121b9 and the 10th negative electrode tab 121b10 (Be4>Be5). The lateral width Be5 of the 9th negative electrode tab 121b9 and the 10th negative electrode tab 121b10 is wider than the lateral width Be6 of the 11th negative electrode tab 121b11 and the 12th negative electrode tab 121b12 (Be5>Be6).

[0081] Thus, the plurality of negative electrode tabs 121b are configured to continuously increase in lateral width from the outside to the inside of the charging / discharging body 100 in units of one. Furthermore, the lateral widths of the first negative electrode tab 121b1 and the second negative electrode tab 121b2 may be different. In this case, the lateral width of the second negative electrode tab 121b2 is preferably wider than the lateral width of the first negative electrode tab 121b1 and narrower than the lateral width of the third negative electrode tab 121b3. Similarly, the lateral widths of the third negative electrode tab 121b3 and the fourth negative electrode tab 121b4 may also be different. In this case, the lateral width of the fourth negative electrode tab 121b4 is preferably wider than the lateral width of the third negative electrode tab 121b3 and narrower than the lateral width of the fifth negative electrode tab 121b5. Similarly, the lateral widths of the fifth negative electrode tab 121b5 and the sixth negative electrode tab 121b6 may also be different. In this case, the lateral width of the 6th negative electrode tab 121b6 is preferably wider than the lateral width of the 5th negative electrode tab 121b5 and narrower than the lateral width of the 7th negative electrode tab 121b7. Similarly, the lateral widths of the 7th negative electrode tab 121b7 and the lateral widths of the 8th negative electrode tab 121b8 may also be different. In this case, the lateral width of the 8th negative electrode tab 121b8 is preferably wider than the lateral width of the 7th negative electrode tab 121b7 and narrower than the lateral width of the 9th negative electrode tab 121b9. Similarly, the lateral widths of the 9th negative electrode tab 121b9 and the lateral width of the 10th negative electrode tab 121b10 may also be different. In this case, the lateral width of the 10th negative electrode tab 121b10 is preferably wider than the lateral width of the 9th negative electrode tab 121b9 and narrower than the lateral width of the 11th negative electrode tab 121b11. Similarly, the lateral widths of the 11th negative electrode tab 121b11 and the 12th negative electrode tab 121b12 may also be different. In this case, the lateral width of the 12th negative electrode tab 121b12 is preferably wider than the lateral width of the 11th negative electrode tab 121b11.

[0082] Alternatively, the multiple negative electrode tabs 121b can be configured to progressively increase the lateral width from the outside to the inside of the charging / discharging body 100 in multiple units. For example, the lateral widths Be1 and Be2 can be set to the same value, the lateral widths Be3 and Be4 can be set to the same value, and the lateral widths Be5 and Be6 can be set to the same value (Be1=Be2>Be3=Be4>Be5=Be6).

[0083] The charging / discharging body 100 is manufactured through a winding process, which involves winding a single, elongated sheet structure formed by sequentially stacking the separator 130, negative electrode 120, separator 130, and positive electrode 110 (see reference). Figure 7The charging / discharging body 100 is flat and has a pair of curved portions 100c formed at both ends in the length direction X, which are arc-shaped when viewed from above, and a flat portion 100p connected to the pair of curved portions 100c. A plurality of negative electrode tabs 121b protrude from the flat portion 100p. That is, the lateral width of the negative electrode tabs 121b is equivalent to the width dimension in the direction orthogonal to the stacking direction (i.e., the width direction Y) of the positive electrode 110, negative electrode 120 and separator 130 of the flat portion 100p and the protrusion direction (i.e., the height direction Z) of the negative electrode tabs 121b.

[0084] During the winding process, tension is applied to the positive electrode 110, negative electrode 120, and separator 130. When the positive electrode 110 and negative electrode 120 elongate due to the tension, the multiple positive electrode tabs 111b and multiple negative electrode tabs 121b may experience positional shift (winding shift). Furthermore, the positional shift from the target position (design position) of the positive electrode tabs 111b and negative electrode tabs 121b accumulates with each winding. Therefore, the tabs located further out of the charging / discharging body 100 have a greater positional shift from the target position.

[0085] Figure 16B This is a planar schematic diagram of a charging / discharging body 100 in a state where multiple negative electrode tabs 121b are displaced. Figure 16B In the example shown, the outermost tab among the multiple negative tabs 121b disposed on the charge / discharge body 100 is the 12th negative tab 121b12. Therefore, the position offset Dx from the target position of the 12th negative tab 121b12 is greater than the position offsets of the other negative tabs 121b. That is, the position offset Dx shown corresponds to the maximum position offset among the multiple negative tabs 121b.

[0086] In this embodiment, as described above, the plurality of negative electrode tabs 121b are configured such that their lateral width gradually increases from the outside to the inside of the charging / discharging body 100. Furthermore, the target positions of the negative electrode tabs 121b are respectively set on the same straight line orthogonal to the center plane Cp (see reference). Figure 16A Furthermore, the lateral width of each negative electrode tab 121b is set to ensure the necessary contact area (target area) relative to the negative current collector 220 even in the event of a anticipated positional shift. Therefore, when multiple negative electrode tabs 121b are positionally shifted, the area of ​​the overlapping region (repeated region) of all negative electrode tabs 121b can be sufficiently ensured when viewed from the width direction Y. That is, the lateral width Beo of the repeated region can be made to be a value greater than or equal to the design value (target value). As a result, the contact area between the bundled multiple negative electrode tabs 121b and the negative current collector 220 can be sufficiently ensured.

[0087] In contrast, if a positional shift occurs in a configuration where all the negative electrode tabs 121b are set to the same lateral width, it may be impossible to ensure a sufficient bonding area. Figure 17A This is a plan view of the charge / discharge body 1000 of the comparative example of this embodiment, showing that the multiple negative electrode tabs 1021b have not shifted in position. Figure 17B This is a plan view of the charge / discharge body 1000 of a comparative example of this embodiment, in which the positions of multiple negative electrode tabs 1021b are shifted.

[0088] like Figure 17A and Figure 17B As shown, in the comparative example of this embodiment, the lateral width Bc of all the plurality of negative electrode tabs 1021b is equal. In this configuration, when the positional offset of the plurality of negative electrode tabs 1021b is large, when viewing the plurality of negative electrode tabs 1021b from the width direction Y, it may not be possible to sufficiently ensure the area of ​​the overlapping region (repeated region) of all negative electrode tabs 121b. That is, it may not be possible to sufficiently ensure the lateral width Bco of the repeated region. As a result, it may not be possible to sufficiently ensure the contact area between the bundled plurality of negative electrode tabs 1021b and the negative electrode current collector 220.

[0089] In the comparative example, to ensure sufficient area of ​​the repeating region, it is considered to increase the lateral width Bc. However, if the lateral width Bc is increased, the overall lateral width Bcx of the bundled negative electrode tabs 1021b becomes larger in the event of positional displacement, which may make it difficult to join the negative electrode current collector 220 in the limited space.

[0090] In contrast, in this embodiment, such as Figure 16A and Figure 16B As shown, the plurality of negative electrode tabs 121b are configured such that their lateral width gradually increases from the outside to the inside of the charging / discharging body 100. Therefore, even if the negative electrode tabs 121b are displaced, the overall lateral width Bex of the bundled plurality of negative electrode tabs 121b can be prevented from increasing. Therefore, according to this embodiment, the plurality of negative electrode tabs 121b can be easily bonded to the negative current collector 220, and the bonding area between the plurality of negative electrode tabs 121b and the negative current collector 220 can be sufficiently ensured.

[0091] In addition, such as Figure 16B As shown, the lateral width of the negative electrode tab 121b is set considering the case where a positional offset occurs with the maximum positional offset Dx. As shown, even when a positional offset occurs with the maximum positional offset Dx, the following conditions are met, therefore it is preferred.

[0092] (Condition 1) Among the multiple negative electrode tabs 121b arranged on one side (lower side of the illustration) with the center plane Cp as the reference, the third negative electrode tab 121b3 to the eleventh negative electrode tab 121b11 do not protrude outward from both ends of the first negative electrode tab 121b1 in the lateral width direction toward the outer side in the length direction X. That is, when viewed from the width direction Y, the projection area of ​​the third negative electrode tab 121b3 to the eleventh negative electrode tab 121b11 is contained within the projection area of ​​the first negative electrode tab 121b1.

[0093] (Condition 2) Among the multiple negative electrode tabs 121b arranged on the other side (upper side in the figure) with the center plane Cp as the reference, the fourth negative electrode tab 121b4 to the twelfth negative electrode tab 121b12 do not protrude outward from both ends of the second negative electrode tab 121b2 in the lateral width direction toward the outer side in the length direction X. That is, when viewed from the width direction Y, the projection area of ​​the fourth negative electrode tab 121b4 to the twelfth negative electrode tab 121b12 is contained within the projection area of ​​the second negative electrode tab 121b2.

[0094] Thus, when the charge / discharge body 100 is viewed from the width direction Y, the plurality of negative electrode tabs 121b are configured such that, within the lateral width of the tab (e.g., the first negative electrode tab 121b1) disposed on the inner side of the charge / discharge body 100, there are tabs (e.g., the third negative electrode tab 121b3, the fifth negative electrode tab 121b5, the seventh negative electrode tab 121b7, the ninth negative electrode tab 121b9, and the eleventh negative electrode tab 121b11) disposed further outward of the charge / discharge body 100 than the first negative electrode tab 121b1. Figure 13 , Figure 14 (etc.). According to this configuration, the overlap area of ​​the negative electrode tabs 121b with each other can be increased. Therefore, the contact area between the negative electrode tabs 121b and the negative current collector 220 can be sufficiently ensured, and the overall lateral width Bex of the bundled negative electrode tabs 121b can be suppressed.

[0095] Reference Figures 13-16B The structure of multiple negative electrode tabs 121b is explained, but the structure of multiple positive electrode tabs 111b is also the same.

[0096] (Effect of battery 1 in the first embodiment)

[0097] The effects of the battery 1 in the first embodiment will be explained.

[0098] In this embodiment, the plurality of negative electrode tabs 121b are configured such that their width (lateral width) along the winding direction of the charge / discharge body 100 gradually increases from the outside to the inside of the charge / discharge body 100. With this configuration, even if the positions of the plurality of negative electrode tabs 121b shift due to manufacturing errors such as winding deviations, the contact area between the plurality of negative electrode tabs 121b and the negative current collector 220 can be sufficiently ensured. As a result, the resistance on the negative electrode side decreases, and the conductivity increases. Similarly, the plurality of positive electrode tabs 111b are configured such that their width (lateral width) along the winding direction of the charge / discharge body 100 gradually increases from the outside to the inside of the charge / discharge body 100. With this configuration, even if the positions of the plurality of positive electrode tabs 111b shift due to manufacturing errors such as winding deviations, the contact area between the plurality of positive electrode tabs 111b and the positive current collector 210 can be sufficiently ensured. As a result, the resistance on the positive electrode side decreases, and the conductivity increases.

[0099] Heat tends to accumulate more easily on the inner side (the side of the winding center axis) of the charge / discharge body 100. In this embodiment, the lateral width of each of the plurality of negative electrode tabs 121b and the plurality of positive electrode tabs 111b is wider closer to the inner side of the charge / discharge body 100. Therefore, the heat of the charge / discharge body 100 can be effectively released.

[0100] (The configuration of battery 1 in the second embodiment)

[0101] The battery 1 in the second embodiment has Figure 18 The charging / discharging element 800 is shown.

[0102] (Composition of the charging / discharging element 800)

[0103] Reference Figure 18 Explain the composition of the charging / discharging body 800. Figure 18 This is a perspective view of the charge / discharge body 800 of the second embodiment, and of the charge / discharge body 800 in a state in which the plurality of negative electrode tabs 821b have not shifted position.

[0104] In the second embodiment, configurations identical to those in the first embodiment are given the same reference numerals as in the first embodiment, and descriptions are omitted. In the second embodiment, configurations different from those in the first embodiment are described using different reference numerals. In the second embodiment, the configuration of the plurality of negative electrode tabs 821b differs from the configuration of the plurality of negative electrode tabs 121b in the first embodiment.

[0105] In the first embodiment, such as Figure 13 As shown, multiple negative electrode tabs 121b are configured such that their lateral width gradually increases from the outside to the inside of the charging / discharging body 100.

[0106] In contrast, in the second embodiment, such as Figure 18As shown, multiple negative electrode tabs 821b are configured such that their lateral width gradually increases from the inside to the outside of the charging / discharging body 800.

[0107] The plurality of negative electrode tabs 821b have a first negative electrode tab 821b1 to a twelfth negative electrode tab 821b12. The first negative electrode tab 821b1 is disposed on the innermost side of the charge / discharge body 800 among the plurality of negative electrode tabs 821b. That is, the first negative electrode tab 821b1 is the negative electrode tab 821b closest to the beginning end of the winding of the sheet structure. The twelfth negative electrode tab 821b12 is disposed on the outermost side of the charge / discharge body 800 among the plurality of negative electrode tabs 821b. That is, the twelfth negative electrode tab 821b12 is the negative electrode tab 821b closest to the end end of the winding of the sheet structure.

[0108] With the center surface Cp of the charging / discharging body 800 as a reference, a first negative electrode tab 821b1, a third negative electrode tab 821b3, a fifth negative electrode tab 821b5, a seventh negative electrode tab 821b7, a ninth negative electrode tab 821b9, and an eleventh negative electrode tab 821b11 are arranged on one side. With the center surface Cp of the charging / discharging body 800 as a reference, a second negative electrode tab 821b2, a fourth negative electrode tab 821b4, a sixth negative electrode tab 821b6, an eighth negative electrode tab 821b8, a tenth negative electrode tab 821b10, and a twelfth negative electrode tab 821b12 are arranged on the other side.

[0109] The first negative electrode tab 821b1, the third negative electrode tab 821b3, the fifth negative electrode tab 821b5, the seventh negative electrode tab 821b7, the ninth negative electrode tab 821b9, and the eleventh negative electrode tab 821b11 are arranged in this order from the inside to the outside of the charge / discharge body 800. The second negative electrode tab 821b2, the fourth negative electrode tab 821b4, the sixth negative electrode tab 821b6, the eighth negative electrode tab 821b8, the tenth negative electrode tab 821b10, and the twelfth negative electrode tab 821b12 are arranged in this order from the inside to the outside of the charge / discharge body 800.

[0110] In this second embodiment, the plurality of negative electrode tabs 821b are formed such that their lateral width gradually increases from the inside to the outside of the charging / discharging body 800.

[0111] Specifically, the lateral widths of the first negative electrode tab 821b1 and the second negative electrode tab 821b2 are narrower than the lateral widths of the third negative electrode tab 821b3 and the fourth negative electrode tab 821b4. The lateral widths of the third negative electrode tab 821b3 and the fourth negative electrode tab 821b4 are narrower than the lateral widths of the fifth negative electrode tab 821b5 and the sixth negative electrode tab 821b6. The lateral widths of the fifth negative electrode tab 821b5 and the sixth negative electrode tab 821b6 are narrower than the lateral widths of the seventh negative electrode tab 821b7 and the eighth negative electrode tab 821b8. The lateral widths of the seventh negative electrode tab 821b7 and the eighth negative electrode tab 821b8 are narrower than the lateral widths of the ninth negative electrode tab 821b9 and the tenth negative electrode tab 821b10. The lateral width of the 9th negative electrode tab 821b9 and the 10th negative electrode tab 821b10 is narrower than that of the 11th negative electrode tab 821b11 and the 12th negative electrode tab 821b12.

[0112] (Effect of battery 1 in the second embodiment)

[0113] Reference Figure 19 The effects of battery 1 in the second embodiment will be explained. Figure 19 This is a perspective view of the charge / discharge body 800 of the second embodiment, and of the charge / discharge body 800 in a state where the positions of the plurality of negative electrode tabs 821b are shifted.

[0114] In this second embodiment, the plurality of negative electrode tabs 821b are configured such that their width (lateral width) along the winding direction of the charge / discharge body 800 gradually increases from the inside to the outside of the charge / discharge body 800. Furthermore, the plurality of negative electrode tabs 821b are configured such that, when the charge / discharge body 100 is viewed from the width direction Y, within the lateral width range of the tab disposed on the outside of the charge / discharge body 800 (e.g., the 11th negative electrode tab 821b11), there is a lateral width greater than that of the tab disposed on the inside of the charge / discharge body 800 (e.g., the 11th negative electrode tab 821b11).

[0115] According to this composition, such as Figure 19 As shown, even when the positions of multiple negative electrode tabs 821b are shifted, similarly to the first embodiment, when the multiple negative electrode tabs 821b are viewed from the width direction Y of the charging / discharging body 800, the area of ​​the overlapping region (repeated region) of all the negative electrode tabs 821b can be sufficiently ensured. As a result, the contact area between the bundled multiple negative electrode tabs 821b and the negative electrode current collector 220 can be sufficiently ensured.

[0116] (The configuration of battery 1 in the third embodiment)

[0117] The battery 1 in the second embodiment has Figure 20 The charging / discharging element 900 is shown.

[0118] (Composition of charging / discharging element 900)

[0119] Reference Figure 20 Explain the composition of the charging / discharging body 900. Figure 20 This is a perspective view of the charge / discharge body 900 of the third embodiment, and of the charge / discharge body 900 in a state in which the plurality of negative electrode tabs 121b have not shifted position.

[0120] In the third embodiment, components identical to those in the first embodiment are given the same reference numerals as those in the first embodiment, and their descriptions are omitted. In the third embodiment, components different from those in the first embodiment are described using different reference numerals. In the third embodiment, the method for manufacturing the charge / discharge body 900 differs from the method for manufacturing the charge / discharge body 100 in the first embodiment.

[0121] In the first embodiment, the charge / discharge body 100 is manufactured by winding a single sheet structure stacked in the order of separator 130, negative electrode 120, separator 130, and positive electrode 110. In contrast, in the third embodiment, the charge / discharge body 900 is manufactured by stacking multiple rectangular sheet structures shorter than the length X of the container 510. This sheet structure is formed by stacking rectangular separators, rectangular negative electrodes, rectangular separators, and rectangular positive electrodes in sequence. Therefore, in the charge / discharge body 900 of this third embodiment, the curved portion 100c described in the first embodiment is not provided; only a flat portion 900p in the shape of a flat cuboid is provided.

[0122] The manufacturing method of the charge / discharge body 900 in the third embodiment does not include the winding process described in the first embodiment. Therefore, the elongation of the sheet structure caused by the tension acting on the sheet structure during the winding process will not occur. However, the third embodiment includes a process of stacking multiple sheet structures. Therefore, when multiple sheet structures are stacked, the position of the negative electrode tab 121b may shift. In addition, laser processing is performed on the exposed portion of one end of the negative electrode current collector layer 121 where the negative electrode active material layer 122 is not provided, so that when the negative electrode tab 121b is formed, the position of the negative electrode tab 121b may shift due to processing errors. Furthermore, during the stamping process in the process of bonding the negative electrode active material layer 122 to the negative electrode current collector (negative electrode current collector foil) 121a, the negative electrode current collector 121a may elongate, and the position of the negative electrode tab 121b may shift.

[0123] (Effect of battery 1 in the third embodiment)

[0124] Reference Figure 21 The effects of battery 1 in the third embodiment will be explained. Figure 21 This is a perspective view of the charge / discharge body 900 of the third embodiment, and of the charge / discharge body 900 in a state where the positions of the plurality of negative electrode tabs 121b are shifted.

[0125] In this third embodiment, the plurality of negative electrode tabs 121b are formed such that their lateral width gradually increases from the outer side to the inner side of the charging / discharging body 900. According to this configuration, as... Figure 21 As shown, even when the positions of multiple negative electrode tabs 121b are offset, similar to the first embodiment, when viewing the multiple negative electrode tabs 121b from the width direction Y, the area of ​​the overlapping region (repeated region) of all the negative electrode tabs 121b can be sufficiently ensured. As a result, the contact area between the bundled multiple negative electrode tabs 121b and the negative current collector 220 can be sufficiently ensured.

[0126] (Battery in other embodiments)

[0127] The battery of the present invention is not limited to the configuration of the battery described in the embodiments, and can be appropriately configured according to the contents described in the claims.

[0128] The embodiments have been described in detail or in brief for the purpose of easily understanding the present invention, and do not necessarily require all the described components, or may include components not shown. Furthermore, a portion of the components of an embodiment may be deleted, replaced with components of other embodiments, or combined with components of other embodiments.

[0129] In the above embodiments, an example was described where the positive electrode tab 111b is connected to the positive current collector plate 210 and electrically connected to the positive terminal 410 via the positive current collector plate 210; and the negative electrode tab 121b is connected to the negative current collector plate 220 and electrically connected to the negative terminal 420 via the negative current collector plate 220. However, the bundled positive electrode tabs 111b can also be directly connected to the positive terminal 410, which serves as a positive conductive member. Similarly, the bundled negative electrode tabs 121b can also be directly connected to the negative terminal 420, which serves as a negative conductive member.

[0130] In the above embodiments, an example was described in which both the plurality of positive electrode tabs 111b and the plurality of negative electrode tabs 121b are configured such that their lateral width gradually increases from one side of the outer or inner side of the charging / discharging bodies 100, 800, and 900 toward the other. However, it is also possible to configure only the plurality of positive electrode tabs 111b such that their lateral width gradually increases from one side of the outer or inner side of the charging / discharging bodies 100, 800, and 900 toward the other. Similarly, it is also possible to configure only the plurality of negative electrode tabs 121b such that their lateral width gradually increases from one side of the outer or inner side of the charging / discharging bodies 100, 800, and 900 toward the other.

[0131] In the first and second embodiments, examples of applying the present invention to batteries in which the positive and negative electrode tabs protrude from one end of the flat-shaped charge / discharge body 100, 800 along the winding axis are described. However, the present invention can also be applied to batteries in which the positive electrode tab protrudes from one end of the cylindrical charge / discharge body housed in a cylindrical container along the axial direction, and the negative electrode tab protrudes from the other end of the axial direction.

[0132] The battery of this invention is not limited to lithium-ion batteries. For example, the battery of this invention can be applied to nickel-metal hydride batteries or lead-acid batteries. The battery of this invention is not limited to secondary batteries. The battery of this invention can be applied to primary batteries.

[0133] The charging / discharging element of the battery of the present invention can be a stacked type in which multiple positive electrodes and multiple negative electrodes formed in relatively short strips are arranged opposite and alternately to a single separator formed in a long strip. In this configuration, the positive and negative electrodes are opposite each other through the separator by folding and stacking the separator. The battery of the present invention is not limited to a configuration with one charging / discharging element. The battery of the present invention can be applied to a configuration with two or more charging / discharging elements. The battery of the present invention is not limited to a configuration in which the charging / discharging elements are sealed by a container and a cap. The battery of the present invention can be applied to a configuration in which the charging / discharging elements are sealed by a laminated film.

[0134] The following is a summary description of the structure, function, and effects of the embodiments of the present invention as described above.

[0135] (1) Battery 1 includes charging / discharging elements 100, 800, and 900, a positive conductive component (positive current collector 210, positive terminal 410), and a negative conductive component (negative current collector 220, negative terminal 420). The charging / discharging elements 100, 800, and 900 are stacked with a positive electrode 110, a negative electrode 120, and a separator (insulating component) 130 disposed between the positive electrode 110 and the negative electrode 120. The separator 130 is an insulating component with insulating properties. The positive electrode 110 has a positive current collector 111a and multiple tabs protruding from the positive current collector 111a, i.e., multiple positive tabs 111b. The negative electrode 120 has a negative current collector 121a and multiple tabs protruding from the negative current collector 121a, i.e., multiple negative tabs 121b. Multiple positive electrode tabs 111b are bundled together and connected to a positive conductive member (e.g., a positive current collector 210). Multiple negative electrode tabs 121b are bundled together and connected to a negative conductive member (e.g., a negative current collector 220). At least one of the multiple positive electrode tabs 111b and the multiple negative electrode tabs 121b includes a tab wider than the tab on one side of the outer or inner side of the charging / discharging body 100, 800, 900.

[0136] Based on this configuration, a battery 1 in which the tabs are fully engaged with conductive components such as the current collector 200 and the electrode terminals 400 can be obtained.

[0137] (2) The charging and discharging bodies 100 and 800 are wound bodies formed by at least the positive electrode 110 and the negative electrode 120 separated by a separator 130 (see reference). Figure 7 wait).

[0138] According to this configuration, in the winding process used to manufacture the charging and discharging bodies 100 and 800, even if the positive electrode 110 and negative electrode 120 elongate due to the tension acting on the positive electrode 110 and negative electrode 120, causing the position of the tabs to shift, the contact area between the multiple tabs and the conductive components can be sufficiently ensured.

[0139] (3) At least one of the plurality of positive electrode tabs 111b and the plurality of negative electrode tabs 121b is configured such that its width along the winding direction of the charge / discharge body 100 gradually increases from the outside to the inside of the charge / discharge body 100 (see reference). Figure 13 , Figure 14 wait).

[0140] According to this configuration, since a wide tab is provided on the inner side of the charge / discharge body 100, which is more likely to store heat than the outer side of the charge / discharge body 100, heat dissipation of the charge / discharge body 100 can be effectively achieved.

[0141] (4) At least one of the plurality of positive electrode tabs 111b and the plurality of negative electrode tabs 121b is configured such that its width along the winding direction of the charge / discharge body 800 gradually increases from the inside to the outside of the charge / discharge body 800 (see reference). Figure 18 , Figure 19 ).

[0142] According to this configuration, a wide tab is disposed on the outside of the charging / discharging body 800 where the positional offset of the tab increases. Therefore, even with a larger positional offset, the contact area between the multiple tabs and the conductive member can be adequately ensured.

[0143] (5) The positive current collector 111a and the positive electrode tab 111b contain aluminum. The negative current collector 121a and the negative electrode tab 121b contain copper. The plurality of positive electrode tabs 111b are configured such that the width along the winding direction of the charge / discharge bodies 100 and 800 gradually widens from one side of the outer side and the inner side of the charge / discharge bodies 100 and 800 toward the other side.

[0144] The positive current collector 111a is more prone to elongation than the negative current collector 121a, making it more susceptible to tab displacement. Therefore, by adjusting the width of the tab on the positive side to ensure the contact area between the positive tab and the conductive component, a more reliable battery 1 can be provided.

[0145] Furthermore, by increasing the width of the positive electrode tab 111b, which has a lower thermal conductivity than the negative electrode tab 121b, the heat dissipation effect on the positive electrode side can be improved. For example, by fixing the width of the tab on the negative electrode side and increasing the width of the tab on the positive electrode side, the heat dissipation on both the positive and negative electrode sides can be made equal. As a result, the temperature gradient within the charge / discharge body can be reduced.

[0146] (6) At least one of the plurality of positive electrode tabs 111b and the plurality of negative electrode tabs 121b is configured such that its width along the winding direction of the charge / discharge body 100 gradually increases from the outside to the inside of the charge / discharge body 100, and within the width range of the tab disposed on the inside of the charge / discharge body 100 (e.g., the first negative electrode tab 121b1), it includes the width of tabs disposed further outside the charge / discharge body 100 than the tab (e.g., the first negative electrode tab 121b1) (e.g., the third negative electrode tab 121b3, the fifth negative electrode tab 121b5, the seventh negative electrode tab 121b7, the ninth negative electrode tab 121b9, and the eleventh negative electrode tab 121b11) (refer to the width of the tab disposed on the outside of the charge / discharge body 100). Figure 13 , Figure 14 wait).

[0147] According to this configuration, in a battery 1 where the width of the tabs continuously or intermittently widens from the outside to the inside of the charging / discharging body 100, the contact area between the multiple tabs and the conductive components can be more adequately ensured.

[0148] (7) At least one of the plurality of positive electrode tabs 111b and the plurality of negative electrode tabs 121b is configured such that its width along the winding direction of the charge / discharge body 800 gradually increases from the inside to the outside of the charge / discharge body 800, and within the width range of the tab disposed on the outside of the charge / discharge body 800 (e.g., the 11th negative electrode tab 821b11), it includes the width of the tabs (1st negative electrode tab 821b1, 3rd negative electrode tab 821b3, 5th negative electrode tab 821b5, 7th negative electrode tab 821b7, 9th negative electrode tab 821b9) disposed further inside the charge / discharge body 800 than the tab (e.g., the 11th negative electrode tab 821b11). Figure 18 , Figure 19 ).

[0149] According to this configuration, in a battery 1 where the width of the tabs continuously or intermittently widens from the inside to the outside of the charging / discharging body 100, the contact area between the multiple tabs and the conductive components can be more adequately ensured.

[0150] Symbol Explanation

[0151] 1…battery, 100…charger / discharger, 100a…one side, 100c…bent section, 100p…flat section, 110…positive electrode, 111…positive electrode current collector layer, 111a…positive electrode current collector (positive electrode current collector foil), 111b…positive electrode tab, 111c…side edge, 112…positive electrode active material layer, 120…negative electrode, 121…negative electrode current collector layer, 121a…negative electrode current collector (negative electrode current collector foil), 121b…negative electrode tab, 121c…side edge, 122…negative electrode active material layer, 130…separator (insulating member), 140…electrolyte, 200…current collector (conductive member), 210…positive electrode current collector plate (positive electrode conductive member), 210a…first base, 210b…second base 210c…connecting part, 210d…recess, 210e…fractured part, 220…negative current collector (negative conductive member), 220a…base, 220b…insertion hole, 300…current blocking body, 310…diaphragm, 310a…main body, 310b…first joint, 310c…second joint, 320…conductive member, 320a…base, 320b…insertion hole, 330…support platform, 330a…main body, 330b…leg, 340…bolt, 400…electrode terminal (conductive member), 410…positive terminal (positive conductive member), 410a…base, 410b…insertion, 410c…joint, 410d…through part, 420…negative terminal (negative conductive member) ), 420a…base, 420b…insertion part, 420c…joint part, 421…first component, 421b…main body, 422…second component, 500…outer body, 510…container, 510a…opening, 510b…receiving part, 520…cap, 520a…positive electrode side insertion hole, 520b…negative electrode side insertion hole, 520c…insertion insertion hole, 530…rupture valve, 540…sealing plug, 540a…head, 540b…insertion part, 600…insulator, 610…insulator cover, 620…positive electrode side insulating plate, 620a…base, 620b…insertion hole, 620c…protrusion, 630…negative electrode side insulating plate, 630a…base, 630b…insertion hole, 630c…protrusion, 700…Sealing body, 710…First gasket on the positive electrode side, 710a…First insertion part, 710b…Second insertion part, 710c…Insertion hole, 720…Second gasket on the positive electrode side, 720a…Base, 720b…Insertion hole, 720c…Protrusion, 730…First gasket on the negative electrode side, 730a…First insertion part, 730b…Second insertion part, 730c…Insertion hole, 740…Second gasket on the negative electrode side, 740a…Base, 740b…Insertion hole, 740c…Protrusion, 800…Charging / discharging body, 821b…Negative electrode tab, 900…Charging / discharging body, 900p…Flat portion, 1100…Charging / discharging body, 1110…Positive electrode, 1112…Positive electrode active material layer, 1113…Heat-resistant insulating layer,X…length direction, Y…width direction, Z…height direction.

Claims

1. A battery, characterized in that, have: A charge / discharge body is composed of a positive electrode, a negative electrode, and an insulating component disposed between the positive electrode and the negative electrode; Positive conductive component; and Negative conductive component, The insulating component is insulating. The positive electrode has a positive current collector and multiple tabs protruding from the positive current collector, i.e., multiple positive tabs. The negative electrode has a negative current collector and multiple tabs protruding from the negative current collector, i.e., multiple negative electrode tabs. The plurality of positive electrode tabs are bonded to the positive electrode conductive component in a bundled manner. The plurality of negative electrode tabs are bonded to the negative electrode conductive component in a bundled manner. At least one of the plurality of positive electrode tabs and the plurality of negative electrode tabs includes a tab that is wider than the tab on the other side of the charge / discharge body, on one side of the outer and inner sides of the charge / discharge body.

2. The battery according to claim 1, characterized in that, The charging / discharging body is a wound body formed by winding at least the positive electrode and the negative electrode with the insulating member in between.

3. The battery according to claim 2, characterized in that, At least one of the plurality of positive electrode tabs and the plurality of negative electrode tabs is configured such that the width along the winding direction of the charge / discharge body gradually widens from the outside to the inside of the charge / discharge body.

4. The battery according to claim 2, characterized in that, At least one of the plurality of positive electrode tabs and the plurality of negative electrode tabs is configured such that the width along the winding direction of the charge / discharge body gradually widens from the inside to the outside of the charge / discharge body.

5. The battery according to claim 2, characterized in that, The positive current collector and the positive electrode tab contain aluminum. The negative current collector and the negative electrode tab contain copper. The plurality of positive electrode tabs are configured such that the width along the winding direction of the charge / discharge body gradually widens from one side of the outer and inner sides of the charge / discharge body toward the other.

6. The battery according to claim 2, characterized in that, At least one of the plurality of positive electrode tabs and the plurality of negative electrode tabs is configured such that the width of the tab gradually widens from the outside of the charge / discharge body toward the inside along the winding direction of the charge / discharge body, and within the range of the width of the tab disposed on the inside of the charge / discharge body, the width of the tab disposed further outside the charge / discharge body than the tab disposed on the inside of the charge / discharge body is included.

7. The battery according to claim 2, characterized in that, At least one of the plurality of positive electrode tabs and the plurality of negative electrode tabs is configured such that the width of the tab gradually widens from the inside to the outside of the charge / discharge body along the winding direction of the charge / discharge body, and within the range of the width of the tab disposed on the outside of the charge / discharge body, the width of the tab disposed further inside the charge / discharge body is included.

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