WO2024067403A1 - Plaque d'électrode et batterie - Google Patents

Plaque d'électrode et batterie Download PDF

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Publication number
WO2024067403A1
WO2024067403A1 PCT/CN2023/120761 CN2023120761W WO2024067403A1 WO 2024067403 A1 WO2024067403 A1 WO 2024067403A1 CN 2023120761 W CN2023120761 W CN 2023120761W WO 2024067403 A1 WO2024067403 A1 WO 2024067403A1
Authority
WO
WIPO (PCT)
Prior art keywords
empty foil
current collector
foil area
area
pole piece
Prior art date
Application number
PCT/CN2023/120761
Other languages
English (en)
Chinese (zh)
Inventor
张蓝天
胡大林
廖兴群
Original Assignee
惠州市豪鹏科技有限公司
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 惠州市豪鹏科技有限公司 filed Critical 惠州市豪鹏科技有限公司
Publication of WO2024067403A1 publication Critical patent/WO2024067403A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application belongs to the field of battery technology, and in particular relates to a pole piece and a battery.
  • the existing tab welding technology is divided into external tab welding and internal tab welding.
  • empty foil areas are set at the head and tail of the foil to place the tabs, and then welding is performed. In order to avoid burrs on the tabs, more empty foil areas will remain in the empty foil areas of the pole pieces, which causes a waste of resources and a loss of energy density of the battery cell.
  • the embedded pole tab is to evenly coat the foil with active material, then the pole piece is laser washed to expose the empty foil area, and the pole tab is placed on the blank foil for welding. This process can improve the energy density of the battery cell, but unreasonable welding position will cause the pole tab to tilt or even fall off.
  • the embedded tab welding technology in the related art has the problem of unreasonable welding position, resulting in waste of welding resources, tab falling off, etc.
  • the technical problem to be solved by the present application is to provide a pole piece and a battery to increase the area of the active layer and enhance the energy density of the pole piece.
  • an embodiment of the present application provides a pole piece, including:
  • the current collector has a first side surface and a second side surface that are arranged opposite to each other;
  • An active layer the active layer being coated on both side surfaces of the current collector
  • the active layer is removed from a predetermined area of the first side surface of the current collector to form a first empty foil area, wherein the first empty foil area
  • the foil area has a first opening facing upward and a second opening perpendicular to the first side surface of the current collector;
  • a pole ear one end of which extends into the first empty foil area and is welded to the first side surface of the current collector, and the other end of which extends out of the first empty foil area; the distance between the bottom surface of the pole ear and the bottom wall of the first empty foil area is 2-6 mm, and the distance between the right side surface of the pole ear and the right side wall of the first empty foil area is 0.1 to 0.2 times the width of the first empty foil area;
  • the active layer extends toward both sides of the opening of the first empty foil area to form protrusions respectively, and the electrode tab extends out of the current collector from opposite sides of the two protrusions.
  • an upper surface of the protrusion is flush with an upper surface of the current collector.
  • the distance between the bottom surface of the electrode tab and the bottom wall of the first empty foil area is 2-6 mm;
  • the distance between the left side surface of the electrode ear and the left side wall of the first empty foil area is 0.1 to 0.2 times the width of the first empty foil area;
  • the distance between the right side surface of the electrode tab and the right side wall of the first empty foil area is 0.1 to 0.2 times the width of the first empty foil area.
  • the first empty foil area is rectangular, and two corners of the bottom of the first empty foil area are both arc-shaped transitions; the diameter of the arc-shaped transition is greater than the width of the first empty foil area.
  • the length of the first empty foil area is 15-30 mm, and the width of the first empty foil area is 8-12 mm.
  • the areas on the facing sides of the two protrusions are provided with grooves, the cross-sectional shape of the grooves is rectangular, the grooves are formed by cutting out the current collector and the active layer within their cross-sectional shape, the length of the grooves parallel to the current collectors is 0.8-1.3 times the length of the first empty foil area; the width of the grooves is 0.1-0.3 times the width of the first empty foil area.
  • a weld mark is provided on the surface of the electrode tab away from the current collector, and the distance between the bottom edge of the weld mark and the bottom wall of the first empty foil area is 2.5-3 mm; the distance between the upper edge of the weld mark and the upper surface of the groove is 3-8 mm; the distance between the bottom edge of the weld mark and the bottom surface of the protrusion is 1.5-2 mm.
  • an adhesive layer is attached to the weld print.
  • a groove is provided in the area on the opposite sides of the two protrusions, the cross-sectional shape of the groove is a regular geometric shape, the groove is formed by cutting out the current collector and the active layer within its cross-sectional shape, and the length of the groove parallel to the current collector is 0.8-1.3 times the width of the first empty foil area; the width of the groove is 0.1-0.3 times the width of the first empty foil area.
  • the active layer is removed from a predetermined area of the second side surface of the current collector to form a second empty foil area.
  • the second empty foil area has a third opening facing upward and a fourth opening perpendicular to the first side surface of the current collector.
  • the orthographic projections of the second empty foil area and the first empty foil area on the surface of the current collector coincide with each other.
  • the active layer extends toward both sides of the opening of the first empty foil area to form protrusions respectively, and the pole ears extend out of the current collector from the opposite sides of the two protrusions. In this way, the area of the active layer 2 can be increased and the energy density of the pole piece can be enhanced.
  • the distance between the pole piece and the empty foil area is controlled so that the welding position of the pole piece and the empty foil area is a better welding position to improve the welding effect and prevent the pole ear from loosening easily.
  • the present application further improves the welding effect by limiting the relative position of the welding mark on the pole ear in the empty foil area.
  • the protrusion in this embodiment reduces the area of the first empty foil area and increases the area of the active layer on the pole piece, thereby achieving the effect of increasing the battery density.
  • an embodiment of the present application further provides a battery, comprising the above-mentioned electrode.
  • FIG1 is an overall schematic diagram of a pole piece provided in a first embodiment of the present application.
  • FIG2 is a half-section schematic diagram of a pole piece provided in the first embodiment of the present application.
  • FIG. 3 is a schematic diagram of the coordination of the current collector and the active layer of the pole piece provided in the first embodiment of the present application;
  • FIG4 is a schematic diagram of a weld mark structure on a pole ear of a pole piece provided in the first embodiment of the present application;
  • FIG5 is a schematic diagram of a half-section structure of a pole piece provided in the third embodiment of the present application.
  • a pole piece provided in the first embodiment of the present application includes a current collector 1, an active layer 2 and a pole ear 3.
  • the current collector has a first side surface and a second side surface arranged oppositely, and the active layer 2 is coated on the two side surfaces of the current collector 1 respectively, and the active layer 2 is composed of an active material.
  • the active layer 2 in the predetermined area is removed on the first side surface of the current collector 1 to form a first empty foil area 11, that is, the active layer 2 on the surface of the current collector 1 is cleaned by laser, so that the current collector 1 in the predetermined area is exposed, and the predetermined area is the first empty foil area 11.
  • the first empty foil area 11 has an opening facing the vertical current collector 1.
  • the first empty foil area 11 When cleaning, it is first washed from one side wall in the width direction of the current collector 1 to the other side wall, so that the first empty foil area 11 also has a side wall facing the width direction of the current collector 1.
  • the direction toward the side wall is defined as facing upward.
  • the first empty foil area 11 has an opening facing upward.
  • the active layer 2 In order to increase the area of the active layer 2 and enhance the energy density of the pole piece, the active layer 2 extends toward both sides of the opening of the first empty foil area 11 to form protrusions 5 respectively.
  • the protrusions in this embodiment reduce the area of the first empty foil area and increase the area of the active layer on the pole piece, thereby achieving the effect of increasing the battery density.
  • the upper edge of the protrusion 5 is flush with the upper surface of the current collector 1 , and the protrusion 5 fits the edge of the current collector as closely as possible, so that the area of the active layer is increased to the maximum extent on the basis of the active layer being stably fixed on the current collector.
  • the first empty foil area 11 and the second empty foil area 12 are respectively arranged at the relative positions of the two side surfaces of the current collector 1, and the second empty foil area 12 and the first empty foil area 11 are arranged in pairs, and the second empty foil area 12 has a third opening and a fourth opening, the third opening faces upward, and the fourth opening faces the opposite direction of the second opening.
  • the projections of the first empty foil area 11 and the second empty foil area 12 on the surface of the current collector 1 on both sides of the current collector 1 completely overlap.
  • the pole ear 3 is welded on the current collector 1 in the first empty foil area 11.
  • the distance between the bottom edge of the pole ear 3 and the bottom wall of the first empty foil area 11 is defined as A, and the value of A is 2-6mm, and the side wall of one side of the pole ear 3 is defined as the right side, and the distance between the right side edge of the pole ear 3 and the side wall of the first empty foil area 11 is 0.1 to 0.2 times the width of the first empty foil area 11.
  • the distance between the left side of the pole ear and the left side wall of the first empty foil area is 0.1 to 0.2 times the width of the first empty foil area 11.
  • the first empty foil area 11 is rectangular, more specifically, the length of the first empty foil area 11 is 15-30 mm, the width of the first empty foil area 11 is 8-12 mm, one end of the length direction of the first empty foil area 11 is the upper opening of the first empty foil area 11, the other end of the length direction of the first empty foil area 11 is the bottom wall of the first empty foil area 11, and the cross-sectional shapes of the two corners of the bottom of the first empty foil area 11 are both arc-shaped transitions 111.
  • the diameter of the arc-shaped transition 111 is greater than the width of the first empty foil area 11.
  • a welding mark 4 is provided on the surface of the electrode tab 3 away from the current collector 1, and the distance between the bottom edge of the welding mark 4 and the bottom wall of the first empty foil area 11 is defined as B, and the value of B is 2.5-3 mm; the distance between the upper edge of the welding mark 4 and the upper surface of the groove 5 is defined as D, and the value of D is 3-8 mm.
  • the distance between the bottom edge of the welding mark 4 and the bottom surface of the protrusion 5 is defined as C, and the value of C is 1.5-2 mm.
  • a portion of the current collector 1 is cut off along its thickness direction to form a groove 6.
  • the groove 6 is mainly used to avoid the occurrence of a short circuit caused by the contact between the tab 3 and the active material of the active layer 2.
  • the groove 6 is located on the upper opening side of the first empty foil area 11 so that one side edge of the groove 6 is flush with the edge of the width side of the current collector 1; the groove 6 in this embodiment is rectangular, the length direction of the groove 6 is parallel to the length direction of the current collector 1, and the length of the groove 6 is 0.8-1.3 times the length of the first empty foil area 11; the width of the groove 6 is 0.1-0.3 times the width of the first empty foil area 11.
  • the pole piece of the second embodiment of the present application is different from the first embodiment in that the areas on the opposite sides of the two protrusions are provided with grooves, the cross-sectional shape of the grooves is a regular geometric shape, the grooves are formed by cutting out the current collector and the active layer within the cross-sectional shape, and the length of the grooves parallel to the current collector is 0.8-1.3 times the width of the first empty foil area 11; the width of the grooves is 0.1-0.3 times the width of the first empty foil area.
  • the grooves can be square, trapezoidal, etc. to reduce the contact between the active layer on the surface of the pole ear and the current collector.
  • the pole piece of the third embodiment of the present application is different from the pole piece of the first embodiment in that, as shown in FIG. 5 ,
  • the pole piece in the example only has the first empty foil area 11 , and the second side surface of the current collector 1 is not provided with the second empty foil area 12 .
  • a fourth embodiment of the present application provides a battery, which includes the pole piece described in any of the above embodiments.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une plaque d'électrode et une batterie comprenant la plaque d'électrode. La plaque d'électrode comprend : un collecteur de courant (1), le collecteur de courant (1) comportant une première surface latérale et une seconde surface latérale disposées à l'opposé l'une de l'autre ; une couche active (3), la couche active (3) étant revêtue sur les deux surfaces latérales du collecteur de courant (1), la couche active (3) étant séparée d'une zone prédéterminée de la première surface latérale du collecteur de courant (1) de façon à former une première zone de feuille vide (11), et la première zone de feuille vide (11) comportant une première ouverture faisant face vers le haut et une seconde ouverture perpendiculaire à la première surface latérale du collecteur de courant (1) ; et une languette, une extrémité de la languette s'étendant dans la première zone de feuille vide (11) et étant soudée à la première surface latérale du collecteur de courant (1), l'autre extrémité de la languette s'étendant hors de la première zone de feuille vide (11), la couche active (3) s'étendant vers les deux côtés de l'ouverture de la première zone de feuille vide (11) de façon à former respectivement des saillies (5), et la languette s'étendant hors du collecteur de courant (1) à partir des côtés opposés des deux saillies (5).
PCT/CN2023/120761 2022-09-29 2023-09-22 Plaque d'électrode et batterie WO2024067403A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202222619243.6U CN218827228U (zh) 2022-09-29 2022-09-29 极片及电池
CN202222619243.6 2022-09-29

Publications (1)

Publication Number Publication Date
WO2024067403A1 true WO2024067403A1 (fr) 2024-04-04

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Application Number Title Priority Date Filing Date
PCT/CN2023/120761 WO2024067403A1 (fr) 2022-09-29 2023-09-22 Plaque d'électrode et batterie

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Country Link
CN (1) CN218827228U (fr)
WO (1) WO2024067403A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN218827228U (zh) * 2022-09-29 2023-04-07 惠州市豪鹏科技有限公司 极片及电池
CN115986049A (zh) * 2022-11-30 2023-04-18 惠州亿纬锂能股份有限公司 一种锂离子电池正极极片、电芯及锂离子电池

Citations (9)

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Publication number Priority date Publication date Assignee Title
WO2019130783A1 (fr) * 2017-12-25 2019-07-04 パナソニックＩｐマネジメント株式会社 Pile rechargeable
CN112670436A (zh) * 2020-12-17 2021-04-16 惠州市豪鹏科技有限公司 电池极片制备方法
CN214589165U (zh) * 2021-04-30 2021-11-02 珠海冠宇电池股份有限公司 一种电芯及电池
CN215869464U (zh) * 2021-09-27 2022-02-18 珠海冠宇电池股份有限公司 极片组件和电池
CN216288522U (zh) * 2021-11-18 2022-04-12 珠海冠宇电池股份有限公司 极片和电池
CN216354304U (zh) * 2021-12-06 2022-04-19 珠海冠宇电池股份有限公司 极片及电池
CN216435937U (zh) * 2021-12-07 2022-05-03 珠海冠宇电池股份有限公司 一种电芯和电池
CN218827233U (zh) * 2022-10-08 2023-04-07 惠州市豪鹏科技有限公司 极片及电池
CN218827228U (zh) * 2022-09-29 2023-04-07 惠州市豪鹏科技有限公司 极片及电池

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019130783A1 (fr) * 2017-12-25 2019-07-04 パナソニックＩｐマネジメント株式会社 Pile rechargeable
CN112670436A (zh) * 2020-12-17 2021-04-16 惠州市豪鹏科技有限公司 电池极片制备方法
CN214589165U (zh) * 2021-04-30 2021-11-02 珠海冠宇电池股份有限公司 一种电芯及电池
CN215869464U (zh) * 2021-09-27 2022-02-18 珠海冠宇电池股份有限公司 极片组件和电池
CN216288522U (zh) * 2021-11-18 2022-04-12 珠海冠宇电池股份有限公司 极片和电池
CN216354304U (zh) * 2021-12-06 2022-04-19 珠海冠宇电池股份有限公司 极片及电池
CN216435937U (zh) * 2021-12-07 2022-05-03 珠海冠宇电池股份有限公司 一种电芯和电池
CN218827228U (zh) * 2022-09-29 2023-04-07 惠州市豪鹏科技有限公司 极片及电池
CN218827233U (zh) * 2022-10-08 2023-04-07 惠州市豪鹏科技有限公司 极片及电池

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