WO2022051915A1 - 电极组件、电化学装置及电子装置 - Google Patents

电极组件、电化学装置及电子装置 Download PDF

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Publication number
WO2022051915A1
WO2022051915A1 PCT/CN2020/114085 CN2020114085W WO2022051915A1 WO 2022051915 A1 WO2022051915 A1 WO 2022051915A1 CN 2020114085 W CN2020114085 W CN 2020114085W WO 2022051915 A1 WO2022051915 A1 WO 2022051915A1
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WO
WIPO (PCT)
Prior art keywords
tab
electrode assembly
tabs
width
pole piece
Prior art date
Application number
PCT/CN2020/114085
Other languages
English (en)
French (fr)
Inventor
金娟
吴飞
Original Assignee
东莞新能安科技有限公司
宁德新能源科技有限公司
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, 宁德新能源科技有限公司 filed Critical 东莞新能安科技有限公司
Priority to PCT/CN2020/114085 priority Critical patent/WO2022051915A1/zh
Priority to CN202080008911.2A priority patent/CN113330631B/zh
Publication of WO2022051915A1 publication Critical patent/WO2022051915A1/zh

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    • 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
    • H01M50/533—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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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 relates to an electrode assembly, an electrochemical device and an electronic device.
  • Electrochemical devices can be charged and discharged, and have been widely used in consumer products, digital products, power products, medical and security and other fields. Electrochemical devices will generate a lot of heat during high-current charging and discharging, and heat accumulation will affect the life and performance of electrochemical devices. In the prior art, a multi-pole-tab structure is generally used to improve the temperature rise problem of an electrochemical device.
  • one aspect of the present application is to provide an electrode assembly with a wider first tab and a second tab, which can increase the heat dissipation area of the tab, reduce the temperature rise of the electrode assembly, and improve the overcurrent capability.
  • the first tab and the second tab are arranged on the same side of the electrode assembly, which can ensure the overcurrent capability of the tab without sacrificing energy density.
  • An embodiment of the present application proposes an electrode assembly, which includes a first pole piece, a first isolation film, and a second pole piece.
  • the first isolation membrane is arranged between the first pole piece and the second pole piece, the first pole piece includes a first current collector, and the second pole piece includes a second current collector.
  • the electrode assembly is provided with a first tab and a second tab, the first tab is electrically connected to the first current collector, and the second tab is electrically connected to the second current collector.
  • the projections of the first tab and the second tab have an overlapping area, and the thickness direction of the electrode assembly is perpendicular to the first direction.
  • the plurality of first tabs are electrically connected, and the plurality of second tabs are electrically connected.
  • the electrode assembly further includes an insulating member for electrically insulating the first tab and the second tab.
  • one side of the plurality of first tabs is connected by welding, and the other side of the plurality of first tabs is connected by conductive glue; and/or one side of the plurality of second tabs is connected by welding, the plurality of The other side of the second tab is connected by electrical glue.
  • first tab and the second tab are positioned opposite each other.
  • at least one of the side of the first tab facing the second tab or the side of the second tab facing the first tab is provided with insulation pieces.
  • the insulator includes an extension of the first isolation membrane.
  • the insulating member includes a second isolation film.
  • the insulating member includes an insulating coating.
  • the insulating member includes insulating tape.
  • the first pole piece is a positive pole piece
  • the second pole piece is a negative pole piece
  • the width of the first tab is greater than or equal to the width of the second tab
  • the first pole piece is a positive pole piece
  • the second pole piece is a negative pole piece
  • the width of the first tab is greater than or equal to the width of the electrode assembly and less than or equal to twice the width of the electrode assembly
  • the The width of the diode tab is less than or equal to the width of the electrode assembly.
  • both the first tab and the second tab are located in a straight section of the electrode assembly, and the width of the first tab is greater than half the width of the straight section of the electrode assembly and less than or equal to the straight section of the electrode assembly.
  • the width of the segment, the width of the second tab is greater than half the width of the straight segment of the electrode assembly and less than or equal to the width of the straight segment of the electrode assembly.
  • the first pole piece is a positive pole piece
  • the second pole piece is a negative pole piece
  • the number of the first pole pieces is greater than or equal to the number of the second pole pieces.
  • the electrode assembly includes N layers, where N is an integer greater than 1, the number of first tabs is greater than or equal to N/2, and the number of second tabs is less than or equal to N/2.
  • At least one of the first tab or the second tab is provided with a through hole.
  • the electrode assembly is a wound structure or a laminated structure.
  • the first tab is formed by extending the first current collector
  • the second tab is formed by extending the second current collector.
  • the first tab is welded to the first current collector, and the second tab is welded to the second current collector.
  • Another aspect of the present application is to provide an electrochemical device, which includes a housing, a first tab, a second tab, and the above-mentioned electrode assembly.
  • the first tab is electrically connected to the first tab
  • the second tab is electrically connected to the second tab.
  • the first tab piece includes a first end and a second end, the width of the first end is greater than the width of the second end, and the first tab is electrically connected to the first end.
  • the second tab includes a third end and a fourth end, the width of the third end is greater than the width of the fourth end, and the second tab is electrically connected to the third end.
  • both the first tab piece and the second tab piece are trapezoidal.
  • Another aspect of the present application is to provide an electronic device including the above electrochemical device.
  • the first current collector and the second current collector extend to form a plurality of first tabs and a plurality of second tabs, respectively, and the first tabs and the second tabs
  • the projections in the thickness direction of the electrode assembly have overlapping regions.
  • the first tab formed by the electrical connection of the plurality of first tabs and the second tab formed by the electrical connection of the plurality of second tabs are wider, which can increase the heat dissipation area of the tabs, reduce the temperature rise of the electrode assembly, and improve the overcurrent capability.
  • the first tab and the second tab are arranged on the same side of the electrode assembly, which can ensure the overcurrent capability of the tab without sacrificing energy density.
  • FIG. 1 shows a schematic structural diagram of an electrode assembly according to an embodiment of the present application
  • FIG. 2 shows a schematic structural diagram of an electrode assembly according to another embodiment of the present application
  • FIG. 3 shows a schematic structural diagram of an electrode assembly according to yet another embodiment of the present application.
  • FIG. 4 shows a schematic structural diagram of an electrode assembly according to yet another embodiment of the present application.
  • FIG. 5 shows a schematic structural diagram of an electrochemical device according to an embodiment of the present application
  • FIG. 6 shows a top view of the tabs and tabs of the electrochemical device shown in FIG. 5 from a first viewing angle
  • FIG. 7 shows a schematic structural diagram of an electrochemical device according to another embodiment of the present application.
  • FIG. 8 shows a top view of the tabs and tabs of the electrochemical device shown in FIG. 7 from a first viewing angle
  • FIG. 9 shows a schematic structural diagram of a first tab piece and a second tab piece according to an embodiment of the present application.
  • FIG. 10 shows a schematic structural diagram of an electrochemical device according to yet another embodiment of the present application.
  • FIG. 11 shows a schematic diagram of a module of an electronic device according to an embodiment of the present application.
  • the overcurrent capability of the tab is equal to the cross-sectional area of the tab multiplied by the safe overcurrent coefficient, which is related to the material of the current collector, such as 8A/mm 2 for copper foil and 5A/mm 2 for aluminum foil.
  • the cross-sectional area of the tab depends on the width and thickness of the tab, which is related to the thickness of the current collector.
  • the thickness of current collectors is getting thinner and thinner.
  • the tab and the current collector are integrally formed, the tab is a part of the current collector, and the thickness of the current collector is the thickness of the tab. If the thickness of the current collector becomes thinner and thinner, the thickness of the tab becomes thinner and thinner. In the case where the tabs are welded on the current collector, if the thickness of the current collector becomes thinner and thinner, the thickness of the tabs will also become thinner and thinner for the reliability of the solder print and to prevent the current collector from being welded through. In the case of high-rate charge and discharge, the overcurrent capability of the tabs may be insufficient, resulting in overheating of the tabs, which in turn affects the performance of the electrochemical device.
  • the electrode assembly 100 according to the embodiment of the present application will be described in detail below with reference to FIGS. 1 to 4 .
  • an electrode assembly 100 includes a first pole piece 10 , a first isolation film 20 , and a second pole piece 30 .
  • the first pole piece 10 includes a first current collector 101 and a first active material layer 102 coated on the first current collector 101 .
  • the second pole piece 30 includes a second current collector 301 and a second active material layer 302 coated on the second current collector 301 .
  • the first active material layer 102 may be coated on one or both sides of the first current collector 101 .
  • the second active material layer 302 may be coated on one or both sides of the second current collector 301 .
  • the electrode assembly 100 further includes an insulating member 40 .
  • the first current collector 101 extends toward the first direction X1 of the electrode assembly 100 to form a plurality of first tabs 1011
  • the second current collector 301 extends toward the first direction X1 of the electrode assembly 100 to form a plurality of second tabs 3011 .
  • the projections of the first tab 1011 and the second tab 3011 on the second direction X2 of the electrode assembly 100 have an overlapping area.
  • the first tab 1011 may be integrally formed with the first current collector 101 . In some embodiments, the first tab 1011 may be provided separately from the first current collector 101 , and the first tab 1011 is electrically connected to the first current collector 101 by welding or other means. In some embodiments, the second tab 3011 may be integrally formed with the second current collector 301 . In some embodiments, the second tab 3011 may be provided separately from the second current collector 301 , and the second tab 3011 is electrically connected to the second current collector 301 by welding or other means.
  • the insulating member 40 is used to electrically insulate the first tab 1011 and the second tab 3011 to avoid a short circuit between the first tab 1011 and the second tab 3011 .
  • the plurality of first tabs 1011 are electrically connected to each other, and the plurality of second tabs 3011 are electrically connected to each other.
  • the plurality of first tabs 1011 are electrically connected to each other to form a positive tab; if the second current collector 301 is a copper foil, the plurality of second tabs 3011 are mutually connected The electrical connection may form the negative tab. If the first current collector 101 is a copper foil, the plurality of first tabs 1011 are electrically connected to each other to form a negative tab; if the second current collector 301 is an aluminum foil, the plurality of second tabs 3011 are electrically connected to each other to form a positive tab .
  • the second direction X2 can be selected as the thickness direction of the electrode assembly 100, and the first direction X1 can be selected to be perpendicular to the second direction X2.
  • the first direction X1 is the extending direction of the first tab 1011
  • the second direction X2 is the thickness direction of the electrode assembly 100
  • the second direction X2 is perpendicular to the direction of the first tab 1011 .
  • the included angle between the first direction X1 and the second direction X2 can be considered to be vertical within the range of 85° to 95°.
  • the plurality of first tabs 1011 and the plurality of second tabs 3011 form first tab regions and second tab regions spaced apart from each other in the second direction X2 of the electrode assembly 100 . That is, the first tab area includes only the first tab 1011 , and the second tab area includes only the second tab 3011 .
  • the plurality of first tabs 1011 and the plurality of second tabs 3011 are disposed opposite to each other.
  • the insulating member 40 is provided on the side of the first tab 1011 facing the second tab 3011 , or the insulating member 40 is provided on the side of the second tab 3011 facing the first tab 1011 .
  • the side of the first tab 1011 facing the second tab 3011 and the side of the second tab 3011 facing the first tab 1011 may also be provided with the insulating member 40 .
  • the insulating member 40 may optionally be an extension of the first isolation film 20 of the electrode assembly 100 .
  • the first isolation membrane 20 may be extended to the side of the first tab 1011 facing the second tab 3011 , and/or the side of the second tab 3011 facing the first tab 1011 .
  • the insulating member 40 may also be a second isolation film independent of the electrode assembly 100 , that is, the second isolation film is a separate isolation film.
  • the insulating member 40 may also be an insulating coating coated on the side of the first tab 1011 facing the second tab 3011 , and/or the second tab 3011 facing the first tab 1011 insulating coating on one side.
  • insulating glue is used to coat the side of the first tab 1011 facing the second tab 3011 and/or the side of the second tab 3011 facing the first tab 1011 to form insulation coating.
  • a ceramic coating is used to coat the side of the first tab 1011 facing the second tab 3011, and/or the side of the second tab 3011 facing the first tab 1011.
  • insulating coating includes inorganic particles including alumina, silica, magnesia, barium titanate, titania, zirconia, barium oxide, magnesium hydroxide, or boehmite and a binder at least one of them.
  • the insulating member 40 may also be an insulating tape pasted on the side of the first tab 1011 facing the second tab 3011 , and/or the second tab 3011 facing the first tab 1011 Insulation tape on one side.
  • the insulating tape is a single-sided adhesive tape.
  • one side of the plurality of first tabs 1011 may be electrically connected to each other by welding, and the other side of the plurality of first tabs 1011 may be electrically connected to each other by conductive glue, thereby enhancing the plurality of first tabs.
  • the conductive contact between the tabs 1011 can allow electrolyte to penetrate and infiltrate between the welding area of the first tab 1011 and the area where the conductive glue is provided.
  • one side of the plurality of second tabs 3011 can be electrically connected to each other by welding, and the other sides of the plurality of second tabs 3011 are electrically connected to each other by conductive glue, thereby strengthening the connection between the plurality of second tabs 3011.
  • the conductive contact between the second tabs 3011 and the area where the conductive glue is disposed can allow electrolyte to penetrate and infiltrate.
  • the first tab 1011 is made of aluminum foil and the second tab 3011 is made of copper foil as an example for description.
  • the first pole piece 10 is a positive pole piece, and a plurality of first pole tabs 1011 are electrically connected to each other to form a positive pole tab.
  • the second pole piece 30 is a negative pole piece, and a plurality of second pole tabs 3011 are electrically connected to each other to form a negative pole tab.
  • the width of the first tab 1011 can be selected to be greater than or equal to the width of the second tab 3011, so that the overcurrent capability of the positive tab is approximately the same as that of the negative tab, or greater than that of the negative tab.
  • the number of the first tab 1011 may be greater than or equal to the number of the first tab 1011 .
  • the number of the diode tabs 3011 can make the overcurrent capability of the positive electrode tab approximately the same as that of the negative electrode tab.
  • the first tab 1011 is configured as a U-shaped structure
  • the second tab 3011 is configured as an I-shaped structure
  • the width of the first tab 1011 is greater than or equal to the width of the electrode assembly 100 and The width of the second tab 3011 is less than or equal to the width of the electrode assembly 100 when it is less than or equal to twice the width of the electrode assembly 100 .
  • the width of the electrode assembly 100 is the distance along the width direction of the electrode assembly 100 , and the width direction is the direction perpendicular to the first direction X1 and parallel to the plane of the pole piece.
  • the first pole piece 10 is unfolded in a plane composed of the first direction X1 and the width direction of the electrode assembly 100 , the arrangement direction of the first pole tab 1011 is unchanged, and the first tab 1011 is along the width of the electrode assembly 100 .
  • the distance in the direction is the width of the first tab 1011 .
  • the second pole piece 30 is unfolded in the plane formed by the first direction X1 and the width direction of the electrode assembly 100, the setting direction of the second pole tab 3011 is unchanged, and the distance of the second pole tab 3011 along the width direction of the electrode assembly 100 is The width of the second tab 3011 .
  • the electrode assembly 100 is formed by winding the first pole piece 10 , the first separator 20 and the second pole piece 30 , that is, the electrode assembly 100 is a wound type.
  • the electrode assembly 100 may also be formed by lamination of the first pole piece 10 , the first isolation film 20 and the second pole piece 30 , that is, the electrode assembly 100 is a lamination type.
  • both the first tab 1011 and the second tab 3011 are located in the straight section of the electrode assembly 100 , and the width of the first tab 1011 is greater than half of the width of the straight section of the electrode assembly 100 and less than or equal to The width of the straight section of the electrode assembly 100 , the width of the second tab 3011 is greater than half the width of the straight section of the electrode assembly 100 and less than or equal to the width of the straight section of the electrode assembly 100 .
  • the straight section of the electrode assembly 100 refers to a portion of the electrode assembly 100 that is not bent in the width direction of the electrode assembly 100 .
  • the width of the straight section of the electrode assembly 100 refers to a straight distance along the width direction of the electrode assembly 100 .
  • first tab 1011 and the second tab 3011 both have larger widths, and the first tab 1011 and the second tab 3011 do not include bent parts, so the first tab 1011 and the second tab 3011 do not include bent parts.
  • the second tab 3011 does not generate bending stress, which can avoid the risk of poor soldering or short circuit of the tab.
  • the electrode assembly 100 includes N layers, where N is an integer greater than 1, the number of the first tabs 1011 may be less than or equal to N/2, and the number of the second tabs 3011 may be less than or equal to N/2.
  • the number of the first tabs 1011 may be equal to the number of the second tabs 3011 , or may not be equal to the number of the second tabs 3011 .
  • the first tabs 1011 are positive tabs, and the number of the first tabs 1011 may be greater than or equal to N/2; the second tabs 3011 are negative tabs, and the number of the second tabs 3011 may be less than or equal to N/2.
  • each of the first tabs 1011 and each of the second tabs 3011 are optionally provided with a plurality of through holes, so that the electrolyte can enter the inside of the electrode assembly 100 to fully infiltrate.
  • the first current collector 101 and the second current collector 301 are extended toward the first direction X1 of the electrode assembly 100 to form a plurality of first tabs 1011 and a plurality of second tabs 3011, respectively, Moreover, the projections of the first tab 1011 and the second tab 3011 on the second direction X2 of the electrode assembly 100 have an overlapping area.
  • the width of the first tab area formed by the electrical connection of the plurality of first tabs 1011 and the second tab area formed by the electrical connection of the plurality of second tabs 3011 is wider, which can increase the heat dissipation area of the tabs and reduce the cost of the electrode assembly. temperature rise, and arranging the first tab and the second tab on the same side of the electrode assembly can ensure the overcurrent capability of the tab without sacrificing energy density.
  • the electrochemical device 200 includes an electrode assembly 100 , a first tab 110 and a second tab 120 .
  • the first tab 1011 and the second tab 3011 are both I-shaped structures, the first tab 110 is electrically connected to the first tab 1011 , and the second tab 120 is electrically connected to the second tab 3011 .
  • the first tab 110 and the second tab 120 are respectively electrically connected to the first tab 1011 and the second tab 3011 by welding.
  • the electrochemical device 200 further includes a housing (not shown) for accommodating the electrode assembly 100 , and the first tab 110 and the second tab 120 protrude from the housing to form two connection terminals.
  • the tabs (the first tab 1011 and the second tab 3011 ) and the tabs (the first tab 110 and the second tab 120 ) and the tabs (the first tab 110 and the second tab 120 ) of the electrochemical device 200 illustrated in FIG. 5 are shown ) top view from the first viewing angle.
  • the number of the first tabs 1011 is the same as the number of the second tabs 3011 , the first tab 110 and the plurality of first tabs 1011 are electrically connected to each other by welding, and the first tab 110 and the first tab 1011 are electrically connected to each other.
  • the second tab 120 and the plurality of second tabs 3011 are electrically connected to each other by welding, and the second tab 120 and the second tab 3011 have a second connection area 140 .
  • the number of the first tabs 1011 may also be different from the number of the second tabs 3011 .
  • a plurality of first tabs 1011 are electrically connected to each other to form positive tabs
  • a plurality of second tabs 3011 are electrically connected to each other to form negative tabs.
  • the plurality of first tabs 1011 are optionally electrically connected to each other through the first connection area 130
  • the plurality of second tabs 3011 are electrically connected to each other through the second connection area 140 , thereby improving the overcurrent capability of the tabs .
  • the first tab 1011 is a U-shaped structure
  • the second tab 3011 is an I-shaped structure
  • the first tab 110 is electrically connected to the first tab 1011
  • the second tab 120 is electrically connected to The second tab 3011.
  • the first tab 110 and the second tab 120 are respectively electrically connected to the first tab 1011 and the second tab 3011 by welding.
  • the tabs (the first tab 1011 and the second tab 3011 ) and the tabs (the first tab 110 and the second tab 120 ) and the tabs (the first tab 110 and the second tab 120 ) of the electrochemical device 200 illustrated in FIG. 7 are shown ) top view from the first viewing angle.
  • the number of the first tabs 1011 is the same as the number of the second tabs 3011 , the first tab 110 and the plurality of first tabs 1011 are electrically connected to each other by welding, and the first tab 110 and the first tab 1011 are electrically connected to each other.
  • the second tab 120 and the plurality of second tabs 3011 are electrically connected to each other by welding, and the second tab 120 and the second tab 3011 have a second connection area 140 .
  • the first tab 110 includes a first end 1101 and a second end 1102 .
  • the width of the first end 1101 is the same as the width of the first tab 1011 , and the width of the first tab 110 from the first end 1101 to the second end 1102 generally decreases gradually, so that the first tab 110 and the The area of the electrical connection area of the first tab 1011 is relatively large.
  • the first tab 1011 is electrically connected to the first end 1101 of the first tab 110 , and the second end 1102 of the first tab 110 can protrude from the housing to form a connection terminal.
  • the second tab 120 includes a third end 1201 and a fourth end 1202 .
  • the width of the third end 1201 is the same as the width of the second tab 3011 , and the width of the second tab 120 generally decreases gradually from the third end 1201 to the fourth end 1202 , so that the second tab 120 and The area of the electrical connection area of the second tab 3011 is relatively large.
  • the second tab 3011 is electrically connected to the third end 1201 of the second tab 120 , and the fourth end 1202 of the second tab 120 can protrude from the housing to form a connection terminal.
  • the present application further discloses an electronic device 300 , and the electronic device 300 includes the electrochemical device 200 in any one of the foregoing situations.
  • the electronic device 200 may be an electric motorcycle, an electric bicycle, a power tool, an electric vehicle, a drone, a mobile phone, a tablet computer, a personal digital assistant, a personal computer, or any other suitable rechargeable device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开了一种电极组件、电化学装置及电子装置，该电极组件包括第一极片、第一隔离膜及第二极片。第一隔离膜设置于第一极片与第二极片之间，第一极片包括第一集流体，第二极片包括第二集流体。沿第一方向，电极组件设置有第一极耳和第二极耳，第一极耳与第一集流体电连接，第二极耳和第二集流体电连接。沿电极组件的厚度方向，第一极耳和第二极耳的投影存在重合区，电极组件的厚度方向垂直于第一方向。多个第一极耳电连接，多个第二极耳电连接。该电极组件还包括绝缘件，绝缘件用于将第一极耳和第二极耳电绝缘。本申请中第一极耳及第二极耳的宽度均较宽，可以降低电极组件的温升，且设置在电极组件的同一侧，不会牺牲能量密度。

Description

电极组件、电化学装置及电子装置 技术领域
本申请涉及一种电极组件、电化学装置及电子装置。
背景技术
电化学装置能够进行充放电，已广泛应用于消费类产品、数码类产品、动力产品、医疗及安防等领域。电化学装置在大电流充放电过程中会产生大量热量，热累积会对电化学装置的寿命和性能产生影响。现有技术一般是采用多极耳结构来改善电化学装置温升问题。
发明内容
本申请旨在至少解决现有技术中存在的技术问题之一。为此，本申请的一个方面在于提出一种电极组件，具有宽度较宽的第一极耳与第二极耳，可提高极耳散热面积，降低电极组件的温升，也可提高过流能力。且将第一极耳与第二极耳设置在电极组件的同一侧，可在保证极耳过流能力的同时又不牺牲能量密度。
本申请实施例提出了一种电极组件，包括第一极片、第一隔离膜及第二极片。第一隔离膜设置于第一极片与第二极片之间，第一极片包括第一集流体，第二极片包括第二集流体。沿第一方向，电极组件设置有第一极耳和第二极耳，第一极耳与第一集流体电连接，第二极耳与第二集流体电连接。沿电极组件的厚度方向，第一极耳和第二极耳的投影存在重合区，电极组件的厚度方向垂直于第一方向。多个第一极耳电连接，多个第二极耳电连接。该电极组件还包括绝缘件，绝缘件用于将第一极耳和第二极耳电绝缘。
在一些实施例中，多个第一极耳的一侧焊接连接，多个第一极耳的另一侧通过导电胶连接；和/或多个第二极耳的一侧焊接连接，多个第二极耳的另一侧 导通过电胶连接。
在一些实施例中，第一极耳和第二极耳相对设置。在相邻的第一极耳和第二极耳中，第一极耳面对第二极耳的一侧或第二极耳面对第一极耳的一侧中的至少一者设置有绝缘件。
在一些实施例中，绝缘件包括第一隔离膜的延伸部。
在一些实施例中，绝缘件包括第二隔离膜。
在一些实施例中，绝缘件包括绝缘涂层。
在一些实施例中，绝缘件包括绝缘胶纸。
在一些实施例中，第一极片为正极极片，第二极片为负极极片，第一极耳的宽度大于或等于第二极耳的宽度。
在一些实施例中，第一极片为正极极片，第二极片为负极极片，第一极耳的宽度大于或等于电极组件的宽度且小于或等于2倍的电极组件的宽度，第二极耳的宽度小于或等于电极组件的宽度。
在一些实施例中，第一极耳和第二极耳均位于电极组件的平直段，第一极耳的宽度大于电极组件的平直段的宽度的一半且小于或等于电极组件的平直段的宽度，第二极耳的宽度大于电极组件的平直段的宽度的一半且小于或等于电极组件的平直段的宽度。
在一些实施例中，第一极片为正极极片，第二极片为负极极片，第一极耳的数量大于或等于第二极耳的数量。
在一些实施例中，电极组件包括N层，N为大于1的整数，第一极耳的数量大于或等于N/2，第二极耳的数量小于或等于N/2。
在一些实施例中，第一极耳或第二极耳中的至少一者设置有通孔。
在一些实施例中，电极组件为卷绕结构或者叠片结构。
在一些实施例中，第一极耳由第一集流体延伸形成，第二极耳由第二集流体延伸形成。
在一些实施例中，所述第一极耳与所述第一集流体焊接连接，所述第二极耳与所述第二集流体焊接连接。
本申请的另外一方面在于提出了一种电化学装置，其包括外壳、第一极耳片、第二极耳片及上述电极组件。第一极耳片电连接于第一极耳，第二极耳片电连接于第二极耳。
在一些实施例中，第一极耳片包括第一端及第二端，第一端的宽度大于第二端的宽度，第一极耳电连接于第一端。
在一些实施例中，第二极耳片包括第三端及第四端，第三端的宽度大于第四端的宽度，第二极耳电连接于第三端。
在一些实施例中，第一极耳片及第二极耳片均呈梯形。
本申请的另外一方面在于提出了一种电子装置，包括上述电化学装置。
根据本申请实施例的电极组件，沿第一方向，第一集流体和第二集流体延伸分别形成多个第一极耳和多个第二极耳，且第一极耳和第二极耳在电极组件的厚度方向上的投影存在重合区。由多个第一极耳电连接形成的第一极耳及由多个第二极耳电连接形成的第二极耳宽度较宽，可提高极耳散热面积，降低电极组件的温升，提高过流能力。且将第一极耳与第二极耳设置在电极组件的同一侧，可在保证极耳过流能力的同时又不牺牲能量密度。
附图说明
本申请的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1示出了根据本申请一实施例的电极组件的结构示意图；
图2示出了根据本申请另一实施例的电极组件的结构示意图；
图3示出了根据本申请又一实施例的电极组件的结构示意图；
图4示出了根据本申请又一实施例的电极组件的结构示意图；
图5示出了根据本申请一实施例的电化学装置的结构示意图；
图6示出了图5所示的电化学装置的极耳与极耳片在第一视角下的俯视图；
图7示出了根据本申请另一实施例的电化学装置的结构示意图；
图8示出了图7所示的电化学装置的极耳与极耳片在第一视角下的俯视图；
图9示出了根据本申请一实施例的第一极耳片与第二极耳片的结构示意图；
图10示出了根据本申请又一实施例的电化学装置的结构示意图；
图11示出了根据本申请一实施例的电子装置的模块示意图；
主要元件符号说明：
第一极片10，第一隔离膜20，第二极片30，绝缘件40，电极组件100，第一集流体101，第一活性材料层102，第二集流体301，第二活性材料层302，第一极耳片110，第二极耳片120，第一连接区130，第二连接区140，第一极耳1011，第二极耳3011，电化学装置200，电子装置300，第一端1101，第二端1102，第三端1201，第四端1202。
具体实施方式
下面详细描述本申请的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本申请，而不能理解为对本申请的限制。
极耳的过流能力等于极耳的横截面积乘以安全过流系数，安全过流系数与集流体材质有关，比如铜箔是8A/mm 2，铝箔是5A/mm 2。极耳的横截面积取决于极耳的宽度和厚度，极耳的厚度与集流体的厚度有关。
然而，目前为了提高电化学装置的能量密度，所采用的集流体厚度越来越薄。在极耳与集流体一体成型情况下，极耳为集流体的一部分，集流体的厚度为极耳的厚度，如果集流体厚度越来越薄，导致极耳厚度越来越薄。在极耳为焊接在集流体上的情况下，如果集流体厚度越来越薄，为了焊印的可靠性，以及不至于焊穿集流体，极耳厚度也会越来越薄。在大倍率充放电情形下，极耳过流能力可能存在不足，造成极耳过热，进而影响电化学装置的性能。
下面参考图1-图4具体描述根据本申请实施例的电极组件100。
如图1所示，根据本申请实施例的电极组件100，包括第一极片10、第 一隔离膜20、第二极片30。第一极片10包括第一集流体101及涂覆于第一集流体101上的第一活性材料层102。第二极片30包括第二集流体301及涂覆于第二集流体301上的第二活性材料层302。
在一些实施例中，第一活性材料层102可以涂覆于第一集流体101的一面或两面。在一些实施例中，第二活性材料层302可以涂覆于第二集流体301的一面或两面。
如图2所示，电极组件100还包括绝缘件40。第一集流体101朝着电极组件100的第一方向X1延伸形成多个第一极耳1011，第二集流体301朝着电极组件100的第一方向X1延伸形成多个第二极耳3011。第一极耳1011和第二极耳3011在电极组件100的第二方向X2上的投影存在重合区。
在一些实施例中，第一极耳1011可以与第一集流体101一体成型。在一些实施例中，第一极耳1011可以与第一集流体101分体设置，第一极耳1011通过焊接或其他方式电连接第一集流体101。在一些实施例中，第二极耳3011可以与第二集流体301一体成型。在一些实施例中，第二极耳3011可以与第二集流体301分体设置，第二极耳3011通过焊接或其他方式电连接第二集流体301。
绝缘件40用于将第一极耳1011和第二极耳3011电绝缘，避免第一极耳1011与第二极耳3011之间发生短路。多个第一极耳1011相互电连接，多个第二极耳3011相互电连接。
在一些实施例中，若第一集流体101为铝箔，则多个第一极耳1011相互电连接可形成正极耳；若第二集流体301为铜箔，则多个第二极耳3011相互电连接可形成负极耳。若第一集流体101为铜箔，则多个第一极耳1011相互电连接可形成负极耳；若第二集流体301为铝箔，则多个第二极耳3011相互电连接可形成正极耳。
在一些实施例中，第二方向X2可选为电极组件100的厚度方向，第一方向X1可选与第二方向X2垂直。如图2所示，第一方向X1为第一极耳1011的延伸方向，第二方向X2为电极组件100的厚度方向，第二方向X2垂直于第一极耳1011的方向。
第一方向X1和第二方向X2的夹角在85°至95°的范围内均可认为是垂直。
在一些实施例中，多个第一极耳1011和多个第二极耳3011在电极组件100的第二方向X2上形成相互隔开的第一极耳区与第二极耳区。即，第一极耳区只包括第一极耳1011，第二极耳区只包括第二极耳3011。多个第一极耳1011和多个第二极耳3011相对设置。为了避免相邻的第一极耳1011和第二极耳3011之间发生短路，在相面对的第一极耳1011和第二极耳3011(该第一极耳1011和该第二极耳3011相邻)中，第一极耳1011面对第二极耳3011的一侧设置有绝缘件40，或第二极耳3011面对第一极耳1011的一侧设置有绝缘件40。在其他实施例中，第一极耳1011面对第二极耳3011的一侧和第二极耳3011面对第一极耳1011的一侧也可以均设置有绝缘件40。
在一些实施例中，绝缘件40可选为电极组件100的第一隔离膜20的延伸部。比如，可以将第一隔离膜20延伸至第一极耳1011面对第二极耳3011的一侧，和/或第二极耳3011面对第一极耳1011的一侧。在其他实施例中，绝缘件40还可以为独立于电极组件100之外的第二隔离膜，即该第二隔离膜为单独设置的隔离膜。
在一些实施例中，绝缘件40还可以为涂覆于第一极耳1011面对第二极耳3011的一侧的绝缘涂层，和/或第二极耳3011面对第一极耳1011的一侧的绝缘涂层。
在一些实施例中，采用绝缘胶涂覆于第一极耳1011面对第二极耳3011的一侧，和/或第二极耳3011面对第一极耳1011的一侧而形成的绝缘涂层。
在一些实施例中，采用陶瓷涂层涂覆于第一极耳1011面对第二极耳3011的一侧，和/或第二极耳3011面对第一极耳1011的一侧而形成的绝缘涂层。在一些实施例中，陶瓷涂层包括无机颗粒和粘接剂，无机颗粒包括氧化铝、二氧化硅、氧化镁、钛酸钡、二氧化钛、二氧化锆、氧化钡、氢氧化镁或者勃姆石中的至少一种。
在一些实施例中，绝缘件40还可以为粘贴于第一极耳1011面对第二极耳 3011的一侧的绝缘胶纸，和/或第二极耳3011面对第一极耳1011的一侧的绝缘胶纸。在一些实施例中，绝缘胶纸为单面粘性的绝缘胶纸。
在一些实施例中，多个第一极耳1011的一侧可选通过焊接方式相互电连接，多个第一极耳1011的另一侧可选通过导电胶相互电连接，进而增强多个第一极耳1011之间的导电接触并可使得第一极耳1011的焊接区和导电胶设置区之间有电解液渗入和浸润。同样地，多个第二极耳3011的一侧可选通过焊接方式相互电连接，多个第二极耳3011的另一侧通过导电胶相互电连接，进而增强多个第二极耳3011之间的导电接触并可使得第二极耳3011的焊接区和导电胶设置区之间有电解液渗入和浸润。
如图3所示，以第一极耳1011为铝箔，第二极耳3011为铜箔为例进行说明。第一极片10为正极极片，多个第一极耳1011相互电连接形成正极耳。第二极片30为负极极片，多个第二极耳3011相互电连接形成负极耳。由于第一极耳1011的安全过流系数(铝箔的安全过流系数一般为5A/mm 2)小于第二极耳3011的安全过流系数(铜箔的安全过流系数一般为8A/mm 2)，第一极耳1011的宽度可选大于或等于第二极耳3011的宽度，可使得正极耳的过流能力大致与负极耳的过流能力相同，或者大于负极耳的过流能力。
在一些实施例中，由于形成正极耳的第一极耳1011的安全过流系数小于形成负极耳的第二极耳3011的安全过流系数，第一极耳1011的数量可选大于或等于第二极耳3011的数量，可使得正极耳的过流能力大致与负极耳的过流能力相同。
在一些实施例中，如图3所示，第一极耳1011设置为U型结构，第二极耳3011设置为I型结构，第一极耳1011的宽度大于或等于电极组件100的宽度且小于或等于2倍的电极组件100的宽度，第二极耳3011的宽度小于或等于电极组件100的宽度。
在本申请中，电极组件100的宽度为沿电极组件100宽度方向的距离，宽度方向为垂直于第一方向X1且平行于极片平面的方向。
在本申请中，将第一极片10在第一方向X1和电极组件100的宽度方向组 成的平面内展开，第一极耳1011的设置方向不变，第一极耳1011沿电极组件100宽度方向的距离即为第一极耳1011的宽度。将第二极片30在第一方向X1和电极组件100的宽度方向组成的平面内展开，第二极耳3011的设置方向不变，第二极耳3011沿电极组件100宽度方向的距离即为第二极耳3011的宽度。
在一些实施例中，如图2与图3，电极组件100由第一极片10、第一隔离膜20及第二极片30卷绕形成，即电极组件100为卷绕型。如图4所示，电极组件100还可以由第一极片10、第一隔离膜20及第二极片30叠片形成，即电极组件100为叠片型。
在一些实施例中，第一极耳1011和第二极耳3011均位于电极组件100的平直段，第一极耳1011的宽度大于电极组件100的平直段的宽度的一半且小于或等于电极组件100的平直段的宽度，第二极耳3011的宽度大于电极组件100的平直段的宽度的一半且小于或等于电极组件100的平直段的宽度。
在本申请中，电极组件100的平直段是指电极组件100中在电极组件100的宽度方向上没有弯折的部分。电极组件100的平直段的宽度是指沿电极组件100宽度方向的平直距离。
如此设置，则第一极耳1011和第二极耳3011均会有较大的宽度，而且第一极耳1011和第二极耳3011不会包括弯折的部分，则第一极耳1011和第二极耳3011不会产生弯折应力，可以避免焊接不良或极耳短路风险。
在一些实施例中，电极组件100包括N层，N为大于1的整数，第一极耳1011的数量可以小于或等于N/2，第二极耳3011的数量可以小于或等于N/2。第一极耳1011的数量可以与第二极耳3011的数量相等，也可以与第二极耳3011的数量不相等。
在一些实施例中，第一极耳1011为正极耳，第一极耳1011的数量可以大于或等于N/2；第二极耳3011为负极耳，第二极耳3011的数量可以小于或等于N/2。
在一些实施例中，每一第一极耳1011与每一第二极耳3011可选均设置有多个通孔，从而使得电解液可以进入电极组件100内部充分浸润。
本申请实施例的电极组件100，将第一集流体101和第二集流体301朝着电极组件100的第一方向X1延伸分别形成多个第一极耳1011和多个第二极耳3011，且第一极耳1011和第二极耳3011在电极组件100的第二方向X2上的投影存在重合区。由多个第一极耳1011电连接形成的第一极耳区及由多个第二极耳3011电连接形成的第二极耳区宽度较宽，可提高极耳散热面积，降低电极组件的温升，且将第一极耳与第二极耳设置在电极组件的同一侧，可在保证极耳过流能力的同时又不牺牲能量密度。
如图5所示，电化学装置200包括电极组件100、第一极耳片110及第二极耳片120。第一极耳1011与第二极耳3011均为I型结构，第一极耳片110电连接于第一极耳1011，第二极耳片120电连接于第二极耳3011。比如，第一极耳片110与第二极耳片120通过焊接方式分别电连接于第一极耳1011与第二极耳3011。
在一些实施例中，电化学装置200还包括用于容纳电极组件100的外壳(未示出)，第一极耳片110与第二极耳片120从外壳中伸出形成两个连接端子。
如图6所示，为图5所示的电化学装置200的极耳(第一极耳1011与第二极耳3011)与极耳片(第一极耳片110与第二极耳片120)在第一视角下的俯视图。第一极耳1011的数量与第二极耳3011的数量相同，第一极耳片110与多个第一极耳1011通过焊接方式相互电连接，第一极耳片110与第一极耳1011具有第一连接区130。第二极耳片120与多个第二极耳3011通过焊接方式相互电连接，第二极耳片120与第二极耳3011具有第二连接区140。在其他实施例中，第一极耳1011的数量也可以与第二极耳3011的数量不相同。比如，多个第一极耳1011相互电连接形成正极耳，多个第二极耳3011相互电连接形成负极耳，第一极耳1011的数量大于第二极耳3011的数量。
在一些实施例中，多个第一极耳1011可选通过第一连接区130相互电连接，多个第二极耳3011通过第二连接区140相互电连接，进而可以提高极耳过流能力。
如图7所示，第一极耳1011为U型结构，第二极耳3011为I型结构，第 一极耳片110电连接于第一极耳1011，第二极耳片120电连接于第二极耳3011。比如，第一极耳片110与第二极耳片120通过焊接方式分别电连接于第一极耳1011与第二极耳3011。
如图8所示，为图7所示的电化学装置200的极耳(第一极耳1011与第二极耳3011)与极耳片(第一极耳片110与第二极耳片120)在第一视角下的俯视图。第一极耳1011的数量与第二极耳3011的数量相同，第一极耳片110与多个第一极耳1011通过焊接方式相互电连接，第一极耳片110与第一极耳1011具有第一连接区130。第二极耳片120与多个第二极耳3011通过焊接方式相互电连接，第二极耳片120与第二极耳3011具有第二连接区140。
如图9所示，第一极耳片110包括第一端1101及第二端1102。第一端1101的宽度与第一极耳1011的宽度相同，且第一极耳片110从第一端1101至第二端1102的宽度大致呈逐渐减小变化，如此第一极耳片110与第一极耳1011电连接区域的面积较大。
如图10所示，第一极耳1011电连接于第一极耳片110的第一端1101，第一极耳片110的第二端1102可以从外壳中伸出形成连接端子。第二极耳片120包括第三端1201及第四端1202。第三端1201的宽度与第二极耳3011的宽度相同，且第二极耳片120从第三端1201至第四端1202的宽度大致呈逐渐减小变化，如此第二极耳片120与第二极耳3011电连接区域的面积较大。第二极耳3011电连接于第二极耳片120的第三端1201，第二极耳片120的第四端1202可以从外壳中伸出形成连接端子。
此外，如图11所示，本申请还公开了一种电子装置300，该电子装置300包括上述任一种情况的电化学装置200。电子装置200可以为电动摩托、电动单车、电动工具、电动汽车、无人机、手机、平板电脑、个人数字助理、个人电脑，或者任何其他适合的可充电式设备。
在本申请的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了 便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。在本申请的描述中，“多个”的含义是两个或两个以上。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本申请的实施例，本领域的普通技术人员可以理解：在不脱离本申请的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本申请的范围由权利要求及其等同物限定。

Claims (18)

  1. 一种电极组件，包括第一极片、第一隔离膜及第二极片，所述第一隔离膜设置于所述第一极片与所述第二极片之间，所述第一极片包括第一集流体，所述第二极片包括第二集流体，其特征在于，
    沿第一方向，所述电极组件设置有第一极耳和第二极耳，所述第一极耳与所述第一集流体电连接，所述第二极耳与所述第二集流体电连接，
    沿所述电极组件的厚度方向，所述第一极耳和所述第二极耳的投影存在重合区，所述电极组件的厚度方向垂直于所述第一方向，多个所述第一极耳电连接，多个所述第二极耳电连接，
    所述电极组件还包括绝缘件，所述绝缘件用于将所述第一极耳和所述第二极耳电绝缘。
  2. 如权利要求1所述的电极组件，其中，多个所述第一极耳的一侧焊接连接，多个所述第一极耳的另一侧通过导电胶连接。
  3. 如权利要求1所述的电极组件，其中，所述第一极耳和所述第二极耳相对设置，在相邻的所述第一极耳和所述第二极耳中，所述第一极耳面对所述第二极耳的一侧或所述第二极耳面对所述第一极耳的一侧中的至少一者设置有所述绝缘件。
  4. 如权利要求1或3所述的电极组件，其中，所述绝缘件满足以下条件中的至少一者：
    所述绝缘件包括所述第一隔离膜的延伸部；
    所述绝缘件包括第二隔离膜；
    所述绝缘件包括绝缘涂层；
    所述绝缘件包括绝缘胶纸。
  5. 如权利要求1所述的电极组件，其中，所述第一极片为正极极片，所述第二极片为负极极片，所述第一极耳的宽度大于或等于所述第二极耳的宽度。
  6. 如权利要求1所述的电极组件，其中，所述第一极片为正极极片，所述第二极片为负极极片，所述第一极耳的宽度大于或等于所述电极组件的宽度且小于或等于2倍的所述电极组件的宽度，所述第二极耳的宽度小于或等于所述 电极组件的宽度。
  7. 如权利要求1所述的电极组件，其中，所述第一极耳和所述第二极耳均位于所述电极组件的平直段，所述第一极耳的宽度大于所述电极组件的平直段的宽度的一半且小于或等于所述电极组件的平直段的宽度，所述第二极耳的宽度大于所述电极组件的平直段的宽度的一半且小于或等于所述电极组件的平直段的宽度。
  8. 如权利要求1所述的电极组件，其中，所述第一极片为正极极片，所述第二极片为负极极片，所述第一极耳的数量大于或等于所述第二极耳的数量。
  9. 如权利要求8所述的电极组件，其中，所述电极组件包括N层，N为大于1的整数，所述第一极耳的数量大于或等于N/2，所述第二极耳的数量小于或等于N/2。
  10. 如权利要求1所述的电极组件，其中，所述第一极耳或所述第二极耳中的至少一者设置有通孔。
  11. 如权利要求1所述的电极组件，其中，所述电极组件为卷绕结构或者叠片结构。
  12. 如权利要求1所述的电极组件，其中，所述第一极耳由所述第一集流体延伸形成，所述第二极耳由所述第二集流体延伸形成。
  13. 如权利要求1所述的电极组件，其中，所述第一极耳与所述第一集流体焊接连接，所述第二极耳与所述第二集流体焊接连接。
  14. 一种电化学装置，包括外壳，其中，所述电化学装置还包括第一极耳片、第二极耳片及如权利要求1至13中任意一项所述的电极组件，所述第一极耳片电连接于所述第一极耳，所述第二极耳片电连接于所述第二极耳。
  15. 如权利要求14所述的电化学装置，其中，所述第一极耳片包括第一端及第二端，所述第一端的宽度大于所述第二端的宽度，所述第一极耳电连接于所述第一端。
  16. 如权利要求14所述的电化学装置，其中，所述第二极耳片包括第三端及第四端，所述第三端的宽度大于所述第四端的宽度，所述第二极耳电连接于所述第三端。
  17. 如权利要求14所述的电化学装置，其中，所述第一极耳片及所述第二极耳片均呈梯形。
  18. 一种电子装置，其中，包括如权利要求13-17任一项所述的电化学装置。
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