WO2021163837A1 - Languette et cellule l'utilisant - Google Patents

Languette et cellule l'utilisant Download PDF

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Publication number
WO2021163837A1
WO2021163837A1 PCT/CN2020/075517 CN2020075517W WO2021163837A1 WO 2021163837 A1 WO2021163837 A1 WO 2021163837A1 CN 2020075517 W CN2020075517 W CN 2020075517W WO 2021163837 A1 WO2021163837 A1 WO 2021163837A1
Authority
WO
WIPO (PCT)
Prior art keywords
area
pole piece
connecting member
tab
battery cell
Prior art date
Application number
PCT/CN2020/075517
Other languages
English (en)
Chinese (zh)
Inventor
白晓功
彭涛
杨超
陶涛
Original Assignee
东莞新能安科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东莞新能安科技有限公司 filed Critical 东莞新能安科技有限公司
Priority to PCT/CN2020/075517 priority Critical patent/WO2021163837A1/fr
Publication of WO2021163837A1 publication Critical patent/WO2021163837A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks

Definitions

  • This application relates to the field of batteries, in particular to a tab and a battery using the tab.
  • Batteries have many advantages such as high energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, light weight, etc., and are widely used in the field of consumer electronics.
  • the tabs realize the electrical connection between the pole pieces in the battery and the outside world.
  • the connection between the tab and the tab is often complicated, especially for the tab containing a composite current collector.
  • a tab of the present application includes a base body and a connecting piece.
  • the base includes a first area and a second area; the connecting member is disposed in the first area and protrudes outward from the surface of the first area, and the connecting member is conductive.
  • the tab structure of the present application is simple, and the connecting piece is formed on the surface of the base body to facilitate the connection with other components, and thus the electrical conduction with other components can be quickly realized.
  • the connecting member includes a first part connecting the first area, and the first part is a column.
  • the connecting member further includes a second part connected to a side of the first part facing away from the first area.
  • the area of the cross section of the second part in the direction where the surface of the connecting member is located in the first area increases as the distance from the cross section to the first area increases.
  • the reduction further facilitates the embedding of the connector into other components to achieve electrical conduction with other components.
  • the connecting member includes a first part connecting the first region, and the area of the cross section of the first part in the direction where the surface of the connecting member is arranged in the first region varies depending on the position. As the distance from the cross section to the first region increases and decreases, it is further convenient for the connector to be embedded in other components to achieve electrical conduction with other components.
  • the connecting member further includes a second part connected to a side of the first part facing away from the first area, and the second part is a column.
  • the connecting members are multiple and distributed at intervals.
  • the first area includes a first surface and a second surface disposed opposite to each other, and the connecting member is disposed on the first surface or disposed on the first surface and the second surface. surface.
  • the connecting member is arranged on the first surface and the second surface, it is convenient for the tabs to be connected with other elements in two directions, increasing the connection position, and at the same time, it is convenient to ensure the effectiveness of the electrical connection.
  • An electric core of the present application includes an electrode assembly formed by stacking or winding a first pole piece and a second pole piece, and an isolation film is arranged between the first pole piece and the second pole piece.
  • the battery cell further includes the tabs as described above, and the connecting piece is embedded in the first pole piece to facilitate connection with the pole piece in the battery core.
  • the first pole piece includes a current collector and an active layer
  • the current collector includes a coated area and an uncoated area
  • the active layer is disposed in the coated area
  • the connection The piece is embedded in the uncoated area.
  • the uncoated area includes a first metal layer, an insulating layer, and a second metal layer stacked in sequence, and the connecting member is embedded in the first metal layer, the insulating layer, and the The second metal layer is used to electrically connect the first metal layer and the second metal layer.
  • the connector is convenient to realize the electrical connection between the conductive layers in the composite current collector.
  • the connecting member is embedded in a plurality of the uncoated regions in the electrode assembly.
  • the first pole piece includes a pole piece body and a connecting terminal
  • the pole piece body includes a current collector and an active layer
  • the connecting terminal is connected to the current collector
  • the connecting piece is embedded in the Several connecting terminals in the electrode assembly.
  • the connecting piece penetrates through the first pole piece, and an end of the connecting piece facing away from the first area is provided with a clamping portion to hold the first pole piece away from the first pole piece.
  • a clamping portion to hold the first pole piece away from the first pole piece.
  • FIG. 1 is a schematic diagram of the structure of a tab according to an embodiment of the application.
  • FIG. 2 is a schematic diagram of the structure of a tab according to another embodiment of the application.
  • FIG. 3 is a schematic diagram of the structure of a tab according to another embodiment of the application.
  • FIG. 4 is a schematic diagram of a partial structure of a tab according to an embodiment of the application.
  • FIG. 5 is a schematic diagram of a partial structure of a tab according to another embodiment of the application.
  • FIG. 6 is a schematic diagram of a partial structure of a tab according to another embodiment of this application.
  • FIG. 7 is a schematic diagram of a partial structure of a tab according to still another embodiment of this application.
  • FIG. 8 is a schematic diagram of a partial structure of a tab according to an embodiment of the application.
  • FIG. 9 is a schematic diagram of a partial structure of a tab according to another embodiment of the application.
  • FIG. 10 is a schematic diagram of a partial structure of a tab according to another embodiment of this application.
  • FIG. 11 is a schematic diagram of a partial structure of a tab according to still another embodiment of this application.
  • FIG. 12 is a schematic diagram of the structure of a tab according to still another embodiment of this application.
  • FIG. 13 is a schematic diagram of the structure of an electrode assembly according to an embodiment of the application.
  • FIG. 14 is a schematic structural diagram of an electrode assembly according to another embodiment of the application.
  • FIG. 15 is a schematic diagram of the structure of a battery cell according to an embodiment of the application.
  • FIG. 16 is a schematic diagram of a partial structure of a battery cell according to an embodiment of the application.
  • FIG. 17 is a schematic structural diagram of an electrode assembly according to another embodiment of this application.
  • FIG. 18 is a schematic diagram of the structure of a battery cell according to another embodiment of the application.
  • FIG. 19 is a schematic diagram of a partial structure of a battery cell according to another embodiment of the application.
  • FIG. 20 is a schematic structural diagram of a battery cell according to another embodiment of this application.
  • the tab 10 includes a base 11 and a connecting member 15.
  • the base 11 includes a first area 111 and a second area 113.
  • the connecting member 15 is disposed in the first area 111 and protrudes outward from the first surface 114 of the first area 111.
  • the connecting member 15 is conductive.
  • the tab 10 of the present application has a simple structure, and can be easily connected with other components through the connecting member 15 so as to quickly realize electrical conduction with other components.
  • the substrate 11 is a conductive material, which can be, but is not limited to, metals such as aluminum, nickel, copper, or other non-metal conductive materials.
  • the second area 113 is formed by extending one end of the first area 111.
  • the length L1 of the first region 111 is 2 mm-50 mm
  • the length L2 of the second region 113 is 5 mm-130 mm.
  • the width D1 of the base 11 is 1 mm-100 mm
  • the thickness T1 of the base 11 is 0.05 mm-5 mm.
  • L1, L2, D1, and T1 may not be limited to the above described range, but may be set according to actual needs.
  • a sealant 17 may be further provided at a position of the second area 113 close to the first area 111, and the sealant 17 may be provided around the second area 113.
  • the length L3 of the sealant 17 is 2 mm-30 mm.
  • the distance T2 from the surface of the sealant 17 away from the surface 113a of the second area 113 to the surface 113a of the adjacent second area 113 is 0.1 mm to 5 mm, and the sealant 17 is away from the second area
  • the distance T3 from the surface of the side surface 113b of the side surface 113b of the 113 to the side surface 113b of the adjacent second region 113 is 1 mm to 20 mm.
  • L3 and T2 may not be limited to the above described range, but may be set according to actual needs.
  • the connecting member 15 is perpendicular to the first surface 114 of the first area 111 to facilitate the connection of other components.
  • the connecting member 15 may also be arranged at other angles to the first surface 114 of the first region 111, such as 85°, 75°, 60°, and so on.
  • the number of the connecting member 15 can be one or more. When there are multiple connecting members 15, the multiple connecting members 15 are distributed at intervals. Please refer to FIG. 2, on the first surface 114 of the first area 111, the connecting members 15 are distributed in a triangular shape. Please refer to FIG. 3, on the first surface 114 of the first area 111, a plurality of the connecting members 15 are distributed in a rectangular shape. In some embodiments, on the first surface 114 of the first region 111, the plurality of connecting members 15 are not limited to the above-mentioned distribution shape, but may also be any other shape, such as an arc shape.
  • each connecting member 15 is 0.1 mm-10 mm.
  • the width D2 of the connection between each connecting member 15 and the first area 111 is 0.01 mm to 5 mm.
  • the connecting member 15 can be made of, but not limited to, aluminum, nickel, copper and other conductive materials.
  • the material of the connecting member 15 can be the same as or different from the material of the base 11.
  • each connecting member 15 is a cylinder, which can be a cylinder or a prism.
  • the prisms can be triangular prisms, quadrangular prisms or other arbitrary shapes.
  • each connecting member 15 can be a regular shape such as a cone (e.g., Figure 4), a truncated cone (e.g., Figure 5), a pyramid (e.g., Figure 6), or a pyramid (e.g., Figure 7), or other irregular shapes (e.g., Figure 8).
  • a cone e.g., Figure 4
  • a truncated cone e.g., Figure 5
  • a pyramid e.g., Figure 6
  • a pyramid e.g., Figure 7
  • other irregular shapes e.g., Figure 8
  • each connecting member 15 includes a first part 151 and a second part 153.
  • One end of the first portion 151 is connected to the first area 111, and the second portion 153 is connected to an end of the first portion 151 away from the first area 111.
  • the first part 151 is a cylinder.
  • the area of the cross section of the second part 153 in the direction of the first surface 114 of the first region 111 decreases as the distance from the cross section to the first region 111 increases, which is convenient for embedding in other components Connect other components electrically.
  • the second portion 153 may be a regular shape such as a cone, a truncated cone, a pyramid or a pyramid, or other irregular shapes (for example, FIG. 10).
  • the area of the cross section of the first portion 151 in the direction where the first surface 114 of the first region 111 is located decreases as the distance from the cross section to the first region 111 increases
  • the second part 153 is a cylinder.
  • the first part 151 is a prism
  • the second part 155 is a prism.
  • the first area 111 further includes a second surface 116, and the second surface 116 is disposed opposite to the first surface 114.
  • the connecting member 15 may also be disposed on the second surface 116 and protrude outward from the second surface 116.
  • the connecting member 15 on the first surface 114 and the connecting member 15 on the second surface 116 can be arranged correspondingly or staggered.
  • the above-mentioned tab 10 is applied to the battery cell 100.
  • the battery cell 100 includes an electrode assembly 20, the electrode assembly 20 is composed of a first pole piece 21, a second pole piece 24 and disposed on the first pole piece 21 and the second pole piece.
  • the isolation film 26 between the pole pieces 24 is formed by stacking or winding.
  • the connecting member 15 in the tab 10 is embedded in the first pole piece 21 to be electrically connected to the first pole piece 21.
  • the connecting member 15 penetrates the first pole piece 21.
  • the end of the connecting member 15 away from the first area 111 may also be provided with a clamping portion 156 to clamp the first pole piece 21 away from the side of the first area 111, so that the The first pole piece 21 is fixed between the first area 111 and the clamping portion 156.
  • the retaining portion 156 can be formed by compressing and deforming the end of the connecting member 15, and the retaining portion 156 can also be formed by other means.
  • the connecting member 15 may not penetrate the first pole piece 21, and only be inserted into the first pole piece 21 and connected to the first pole piece 21.
  • the first pole piece 21 may be a positive pole piece or a negative pole piece.
  • the first pole piece 21 includes a current collector 211 and an active layer 213.
  • the current collector 211 includes a coated area 214 and an uncoated area 215 connected to the coated area 214.
  • the active layer 213 is disposed on the surface of the coating area 214, and the connecting member 15 is embedded in the uncoated area 215 to electrically connect the first pole piece 21.
  • the uncoated area 215 includes a first metal layer 216, an insulating layer 217, and a second metal layer 218 stacked in sequence.
  • the connecting member 15 is sequentially embedded in the first metal layer 216, the insulating layer 217, and the second metal layer 218, thereby electrically connecting the first metal layer 216 and the second metal layer 218.
  • the uncoated area 215 may be composed of only a metal foil.
  • the connecting member 15 is embedded in a plurality of the uncoated regions 215 in the electrode assembly 20.
  • a plurality of the uncoated regions 215 may be provided on the first pole piece 21 at intervals, and a plurality of the uncoated regions 215 may be provided on the first pole piece 21.
  • the coating area 215 corresponds to it.
  • an uncoated area 215 can be provided on each layer of the first pole piece 21 that is wound up (as shown in FIG. 14), or an uncoated area 215 can be provided on each turn of the first pole piece 21 that is wound up. Set an uncoated area 215 (as shown in FIG.
  • an uncoated area 215 can be provided on the first pole piece 21 that is wound up by one layer. It is only necessary to set a plurality of uncoated areas 215 correspondingly Can.
  • the connecting member 15 is sequentially embedded in the plurality of uncoated regions 215 on the first pole piece 21.
  • the electrode assembly 20 when the electrode assembly 20 is in a stacked structure, the electrode assembly 20 includes a plurality of the first pole pieces 21 stacked on top of each other, and the connecting member 15 is sequentially embedded in the plurality of first pole pieces 21. An uncoated area 215 on the pole piece 21.
  • the first pole piece 21 includes a pole piece body 210 and a connecting terminal 219.
  • the pole piece body 210 includes a current collector 211 and is disposed on the surface of the current collector 211.
  • the active layer 213, the connecting terminal 219 is connected to the current collector 211.
  • the connecting member 15 is embedded in the connecting terminal 219.
  • the connection member 15 is embedded in the plurality of the connection terminals 219.
  • a plurality of the connecting terminals 219 are arranged on the first pole piece 21 at intervals, and the plurality of connecting terminals 219 correspond to each other.
  • a connecting terminal 219 may be provided on each layer of the first pole piece 21 that is wound, or a connecting terminal 219 may be provided on each turn of the first pole piece 21 that is wound, or even
  • a connecting terminal 219 may be provided on the first pole piece 21 that is wound in another layer, and only a plurality of connecting terminals 219 need to be arranged correspondingly.
  • the connecting member 15 is embedded in a number of the connecting terminals 219 in sequence. As shown in FIG. 13, when the electrode assembly 20 is in a stacked structure, the electrode assembly 20 includes a plurality of the first pole pieces 21 stacked on top of each other, and the connecting member 15 is sequentially embedded in the plurality of first pole pieces. 21 on the connection terminal 219.
  • the connecting member 15 on one of the above-mentioned tabs 10 is embedded in the first pole piece 21, and the battery cell 100 may further include another tab 10a (as shown in FIG. 20),
  • the structure of the tab 10a is the same as the structure of the tab of the present application.
  • the connecting member 15 on the tab 10 a is embedded in the second pole piece 24 to be electrically connected to the second pole piece 24.
  • the tab 10 of the present application has a simple structure, and a connecting piece 15 is formed on the surface of the base 11 to facilitate connection with other components, thereby quickly realizing electrical conduction with other components.
  • the connecting member 15 of the tab 10 is convenient for connection with a pole piece in the battery core.
  • the connecting member 15 is convenient to realize the electrical connection between the conductive layers in the composite current collector.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne une languette, comprenant un corps de base et un connecteur. Le corps de base comprend une première zone et une seconde zone; et le connecteur est disposé dans la première zone et fait saillie vers l'extérieur à partir d'une surface de la première zone, et le connecteur est conducteur. La languette de la présente invention présente une structure simple, et le connecteur est formé sur une surface du corps de base, de telle sorte que la languette peut être facilement connectée à d'autres éléments, et peut ainsi être rapidement conduite électriquement vers les autres éléments. L'invention concerne en outre une cellule utilisant ladite languette.
PCT/CN2020/075517 2020-02-17 2020-02-17 Languette et cellule l'utilisant WO2021163837A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/075517 WO2021163837A1 (fr) 2020-02-17 2020-02-17 Languette et cellule l'utilisant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/075517 WO2021163837A1 (fr) 2020-02-17 2020-02-17 Languette et cellule l'utilisant

Publications (1)

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WO2021163837A1 true WO2021163837A1 (fr) 2021-08-26

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PCT/CN2020/075517 WO2021163837A1 (fr) 2020-02-17 2020-02-17 Languette et cellule l'utilisant

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115425371A (zh) * 2022-11-04 2022-12-02 宁德新能源科技有限公司 一种电化学装置及电子装置
WO2023207341A1 (fr) * 2022-04-29 2023-11-02 珠海冠宇电池股份有限公司 Feuille d'électrode et batterie

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102569712A (zh) * 2012-02-06 2012-07-11 福建师范大学 一种凹型插槽式铝极耳与电路板导电片的连接件
CN205666280U (zh) * 2016-06-07 2016-10-26 中国农业大学 一种可二次使用的电池连接装置以及电池模组

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102569712A (zh) * 2012-02-06 2012-07-11 福建师范大学 一种凹型插槽式铝极耳与电路板导电片的连接件
CN205666280U (zh) * 2016-06-07 2016-10-26 中国农业大学 一种可二次使用的电池连接装置以及电池模组

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023207341A1 (fr) * 2022-04-29 2023-11-02 珠海冠宇电池股份有限公司 Feuille d'électrode et batterie
CN115425371A (zh) * 2022-11-04 2022-12-02 宁德新能源科技有限公司 一种电化学装置及电子装置
CN115425371B (zh) * 2022-11-04 2023-03-14 宁德新能源科技有限公司 一种电化学装置及电子装置

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