WO2021146874A1 - 电极组件及电池 - Google Patents

电极组件及电池 Download PDF

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Publication number
WO2021146874A1
WO2021146874A1 PCT/CN2020/073339 CN2020073339W WO2021146874A1 WO 2021146874 A1 WO2021146874 A1 WO 2021146874A1 CN 2020073339 W CN2020073339 W CN 2020073339W WO 2021146874 A1 WO2021146874 A1 WO 2021146874A1
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WO
WIPO (PCT)
Prior art keywords
tab
electrode assembly
units
unit
pole piece
Prior art date
Application number
PCT/CN2020/073339
Other languages
English (en)
French (fr)
Inventor
胡红伟
田姣
许玉江
Original Assignee
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to EP20916012.6A priority Critical patent/EP4080667A4/en
Priority to CN202210594890.8A priority patent/CN114865240A/zh
Priority to CN202080004326.5A priority patent/CN112889181B/zh
Priority to PCT/CN2020/073339 priority patent/WO2021146874A1/zh
Priority to US17/219,754 priority patent/US20210226305A1/en
Publication of WO2021146874A1 publication Critical patent/WO2021146874A1/zh
Priority to US18/404,925 priority patent/US20240154269A1/en

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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
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This application relates to the field of batteries, and in particular to an electrode assembly and a battery with the electrode assembly.
  • the application provides an electrode assembly including a first pole piece, a second pole piece and an isolation membrane.
  • the polarity of the second pole piece is opposite to the polarity of the first pole piece, and the isolation film is arranged between the first pole piece and the second pole piece.
  • the electrode assembly is formed by winding the first pole piece, the isolation film, and the second pole piece.
  • a plurality of first tab units and a plurality of second tab units are provided on the first pole piece, and a plurality of third tab units are provided on the second pole piece.
  • the plurality of first tab units are stacked to form a first tab
  • the plurality of second tab units are stacked to form a second tab
  • the plurality of third tabs The tab units are stacked to form a third tab.
  • the three tabs can be configured as two positive poles and one negative pole, or two negative poles and one positive pole, and the multiple tabs are shunted in parallel to reduce the temperature rise of the electrode assembly.
  • the projection of the first tab, the second tab, and the third tab in a direction perpendicular to the thickness direction of the electrode assembly
  • the projections on the surface do not overlap, so that the electrode assembly exhibits three tab structures in appearance.
  • the first pole piece includes a plurality of first winding units, and the plurality of first tab units and the plurality of second tab units are distributed on the plurality of first winding units;
  • the second pole piece includes a plurality of second winding units, and the plurality of third tab units are distributed on the plurality of second winding units;
  • the first winding unit includes a first flat Portion and a first curved portion
  • the second winding unit includes a second straight portion and a second curved portion, a plurality of the first straight portions and a plurality of the second straight portions are alternately stacked set up.
  • first straight part where the first tab unit is not provided between two adjacent first tab units, and defines the first straight part where the first tab unit is not provided.
  • the straight part is a spacer layer, which can prevent the distance between the first tab units from being too close.
  • the second tab unit is disposed on the spacer layer, that is, the first tab unit and the second tab unit are respectively disposed on different first winding units.
  • the electrode assembly includes a winding start end, and in a thickness direction of the electrode assembly, the winding start end divides the electrode assembly into a first part and a second part; A plurality of first tab units are disposed in the first part, and the plurality of second tab units are disposed in the second part, thereby increasing the distance between the first tab and the second tab.
  • At least one of the first winding units may be provided with one first tab unit and one second tab unit.
  • At least one second winding unit is spaced between two adjacent third tab units, thereby increasing the distance between adjacent third tab units.
  • each second winding unit may also be provided with one third tab unit.
  • the first tab unit in the length direction of the electrode assembly, is located at the first end of the electrode assembly, and the second tab unit is located at the second end of the electrode assembly. end. Therefore, in the length direction of the electrode assembly, the first tab protrudes from the first end of the electrode assembly, and the second tab protrudes from the second end of the electrode assembly.
  • the electrode assembly includes a tab, and the first tab unit and the second tab unit are the first end and the second end of the tab, respectively.
  • the tab is arranged in the first winding unit, and the first end and the second end of the tab protrude from the first winding unit. The arrangement of the tabs is beneficial to simplify the installation process of the first tab and the second tab.
  • the plurality of first tab units, the plurality of second tab units and the first pole piece are integrally formed, and the plurality of third tab units and the first pole piece are integrally formed.
  • the two-pole piece is integrally formed.
  • the first pole piece or the second pole piece is further provided with a plurality of fourth tab units, and along the thickness direction of the electrode assembly, the plurality of fourth tab units The units are stacked to form a fourth tab.
  • the arrangement of the fourth tab can further divide the current and improve the overcurrent capability of the electrode assembly.
  • the third tab is located at the first end of the electrode assembly, and the fourth tab is located at the second end of the electrode assembly.
  • the projection of the third tab on the projection surface is located between the projections of the first tab and the second tab.
  • one end of the first tab protruding from the electrode assembly is provided with at least two electrical connection parts.
  • the at least two electrical connection parts are spaced apart from each other and are used to connect an external circuit or an electrical device so that the first The pole ears are divided into two pole ears of the same polarity to further divide the current and improve the overcurrent capability of the electrode assembly.
  • the material of the first tab or the third tab is copper, nickel, or copper-plated nickel.
  • the present application also provides a battery, including a casing and an electrode assembly, the electrode assembly being the electrode assembly described in any one of the above, and the casing accommodating the electrode assembly.
  • the battery includes a plurality of electrode terminals arranged on the outer surface of the casing, and each of the electrode terminals is electrically connected to the first tab, the second tab, and the third tab, respectively.
  • the above-mentioned electrode assembly forms the first, second, and third tabs by winding multiple tab units with the pole pieces, so that the electrode assembly has a multi-pole structure, and the multiple tabs are used to shunt in parallel to achieve improved The purpose of battery overcurrent capability and lower temperature rise.
  • FIG. 1 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece of the electrode assembly in the first embodiment.
  • Fig. 2 is a schematic diagram of the winding structure of the electrode assembly in the first embodiment.
  • Fig. 3 is a schematic diagram of the appearance and structure of the electrode assembly in the first embodiment.
  • Fig. 4 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece in the second embodiment.
  • Fig. 5 is a schematic diagram of the winding structure of the electrode assembly in the second embodiment.
  • Fig. 6 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece in the third embodiment.
  • FIG. 7 is a schematic diagram of the winding structure of the electrode assembly in the third embodiment.
  • Fig. 8 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece in the fourth embodiment.
  • Fig. 9 is a schematic diagram of the winding structure of the electrode assembly in the fourth embodiment.
  • Fig. 10 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece in the fifth embodiment.
  • FIG. 11 is a schematic diagram of the side structure of the electrode assembly in the fifth embodiment.
  • Fig. 12 is a schematic diagram of the appearance and structure of the electrode assembly in the fifth embodiment.
  • Fig. 13 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece in the sixth embodiment.
  • Fig. 14 is a schematic diagram of the winding structure of the electrode assembly in the sixth embodiment.
  • Fig. 15 is a schematic diagram of the expanded structure of the first pole piece and the second pole piece in the seventh embodiment.
  • Fig. 16 is a schematic diagram of the winding structure of the electrode assembly in the seventh embodiment.
  • Figure 17 is a schematic diagram of the bent structure of the tab.
  • Figure 18 is a schematic diagram of the structure of the tab and the first tab.
  • Fig. 19 is a schematic diagram of the structure of the electrode assembly in the eighth embodiment.
  • FIG. 20 is a schematic diagram of the structure of the battery in the ninth embodiment.
  • the first winding unit 11 The first winding unit 11
  • the second winding unit 21 The second winding unit 21
  • the second pole ear unit 51 The second pole ear unit 51
  • the application provides an electrode assembly including a first pole piece, a second pole piece and an isolation membrane.
  • the polarity of the second pole piece is opposite to the polarity of the first pole piece, and the isolation film is arranged between the first pole piece and the second pole piece.
  • the electrode assembly is formed by winding the first pole piece, the isolation film, and the second pole piece.
  • a plurality of first tab units and a plurality of second tab units are provided on the first pole piece, and a plurality of third tab units are provided on the second pole piece.
  • the plurality of first tab units are stacked to form a first tab
  • the plurality of second tab units are stacked to form a second tab
  • the plurality of third tabs The tab units are stacked to form a third tab.
  • the above-mentioned electrode assembly forms the first, second, and third tabs by winding multiple tab units with the pole pieces, so that the electrode assembly has a multi-pole structure, and the multiple tabs are used to shunt in parallel to achieve improved The purpose of battery overcurrent capability and lower temperature rise.
  • the electrode assembly 100 includes a first pole piece 10, a second pole piece 20 and an isolation film 30.
  • the polarity of the second pole piece 20 is opposite to the polarity of the first pole piece 10, and the isolation film 30 is disposed between the first pole piece 10 and the second pole piece 20.
  • the electrode assembly 100 is formed by winding the first pole piece 10, the isolation film 30 and the second pole piece 20.
  • a plurality of first tab units 41 and a plurality of second tab units 51 are provided on the first pole piece 10, and a plurality of third tab units 61 are provided on the second pole piece 20.
  • the direction indicated by arrow A in FIG. 2 is the thickness direction of the electrode assembly 100.
  • the plurality of first tab units 41 are stacked to form a first tab 40, and the plurality of second tab units 51 are stacked to form a second tab 50, so The plurality of third tab units 61 are stacked to form the third tab 60.
  • the multiple tab units will be bent uniformly to form tabs, which are used to connect external adapters or external circuits.
  • the projection surfaces of the first tab 40, the second tab 50 and the third tab 60 are perpendicular to the thickness direction of the electrode assembly.
  • the projections on the above do not overlap, so that the electrode assembly 100 can exhibit three tab structures in appearance.
  • the three tabs can be configured as two positive poles and one negative pole, or two negative poles and one positive pole, and shunt flow through multiple tabs in parallel to reduce the temperature rise of the electrode assembly.
  • the material of the negative electrode ear can be copper, nickel, or copper-nickel-plated.
  • the poles of the first tab 40 and the second tab 50 are The polarity is the same as the first pole piece 10, and the polarity of the third pole piece 60 is the same as that of the second pole piece 20.
  • the first pole piece 10 includes a plurality of first winding units 11, and the plurality of first tab units 41 and the plurality of second tab units 51 are distributed in the plurality of first winding units 11 superior.
  • the second pole piece 20 includes a plurality of second winding units 21, and the plurality of third tab units 61 are distributed on the plurality of second winding units 21.
  • the first winding unit 11 includes a first straight portion 111 and a first curved portion 112, and the second winding unit 21 includes a second straight portion 211 and a second curved portion 212.
  • the first straight portion 111 and the plurality of second straight portions 211 are alternately stacked and arranged.
  • the winding unit shown in the schematic diagram of the pole piece unfolding structure in FIG. 1 is only an example, and the lengths of the multiple first and second winding units may be different, depending on the actual winding situation.
  • the electrode assembly 100 includes a winding start end 101.
  • the winding start end 101 divides the electrode assembly 100 into a first part 102 and a second part 103.
  • the part below the winding start end 101 is the first part 102
  • the part above the winding start end 101 is the second part 103.
  • the first winding unit 11 is sorted when the first pole piece 10 is unfolded, and the first tab unit 41 and the second tab unit 51 are both arranged in the odd-numbered first winding unit 11 .
  • the second pole piece 20 is unfolded, the second winding unit 21 is sorted, and the third tab unit 61 is arranged in the odd-numbered second winding unit 21. Therefore, after the winding process is completed, the first tab unit 41, the second tab unit 51, and the third tab unit 61 are all set in the first portion 102.
  • a first tab unit 41 and a second tab unit 51 are provided on the first straight portion 111 of each layer, and a third tab unit is provided on the second straight portion 211 of each layer 61.
  • the first tab 40, the second tab 50, and the third tab 60 are all located in the first part 102, and multiple tabs can be bent at the same time, which reduces the process complexity of the manufacturing process.
  • the projection of the third tab 60 on the projection surface is located between the projections of the first tab 40 and the second tab 50 .
  • the first tab 40 may be located between the third tab 60 and the second tab 50, or the second tab 50 is located between the first tab 40 and the third tab 60 , This application is not limited to this.
  • the direction indicated by arrow C in FIG. 3 is the length direction of the electrode assembly 100.
  • the first tab 40, the second tab 50, and the third tab 60 all start from the first tab in the length direction of the electrode assembly 100.
  • One end 104 extends.
  • the first tab 40, the second tab 50, and the third tab 60 may protrude from the second end 105 in the length direction of the electrode assembly 100.
  • the electrode assembly 100 of the second embodiment is substantially the same as the first embodiment, the difference is that in the second embodiment, the first winding unit 11 is sorted when the first pole piece 10 is unfolded , The first tab unit 41 and the second tab unit 51 are both arranged in the even-numbered first winding unit 11. When the second pole piece 20 is unfolded, the second winding unit 21 is sorted, and the third tab unit 61 is arranged in the even-numbered second winding unit 21. Therefore, after the winding process is completed, the first tab unit 41, the second tab unit 51 and the third tab unit 61 are all set in the second part 103. Other structures of the electrode assembly 100 of the second embodiment that are substantially the same as those of the first embodiment will not be repeated here.
  • the first tab unit 41 is disposed in the odd-numbered first winding unit 11, and the second tab unit 51 is disposed in the even-numbered first winding unit 11.
  • the plurality of first tab units 41 are disposed on the first part 102, and the plurality of second tab units 51 are disposed on the second part 103, thereby increasing the first tab 40 and the second tab 50
  • the distance between the first tab 40 and the second tab 50 avoids interference during the manufacturing or bending process, and reduces the manufacturing difficulty.
  • the third tab unit 61 can be provided in the first part 102 or the second part 103, or can be provided in the first part 102 and the second part 103 at the same time.
  • the electrode assembly 100 of the third embodiment is substantially the same as the first embodiment, the difference is that each first winding unit 11 in the third embodiment is provided with a first tab unit 41 And one second tab unit 51, and one third tab unit 61 is provided on each second winding unit 21.
  • the first part 102 and the second part 103 of the electrode assembly 100 are both provided with a first tab unit 41, a second tab unit 51, and a third tab unit 61, the first tab 40, the second tab 50
  • the increase in the thickness of the third tab 60 and the third tab 60 can effectively reduce the internal resistance of the electrode assembly 100.
  • Other structures of the electrode assembly 100 of the third embodiment that are substantially the same as those of the first embodiment will not be repeated here.
  • the electrode assembly 100 of the fourth embodiment is substantially the same as that of the first embodiment.
  • the difference is that in the fourth embodiment, there is a layer between two adjacent first tab units 41.
  • the first straight portion 111 without the first tab unit 41 defines the first straight portion 111 without the first tab unit 41 as a spacer layer.
  • the second tab unit 51 is disposed on the spacer layer, that is, the first tab unit 41 and the second tab unit 51 are respectively disposed on different first winding units 11.
  • this arrangement is suitable for the case where the size of the electrode assembly 100 in the width direction (the direction indicated by the arrow B in FIG.
  • the arrangement of the spacer layer can prevent the multiple tab units from being too close and affecting the heat dissipation performance of the tabs.
  • the first tab unit 41 is roughly disposed on the left side of the first straight portion 111 of the first layer, and the second tab unit 51 is roughly disposed on the right side of the spacer layer.
  • the third tab unit 61 is roughly arranged in the middle of the second straight portion 211, and in the first portion 102 of the electrode assembly 100, a third tab unit 61 is provided on each layer of the second straight portion 211, so that the third The tab 60 is located between the first tab 40 and the second tab 50.
  • the first tab unit 41, the second tab unit 51, and the third tab unit 61 are all provided in the first part 102.
  • first tab unit 41, the second tab unit 61 The ear unit 51 and the third tab unit 61 can also be arranged in the second part 103, or arranged in the first part 102 and the second part 103 at the same time.
  • the third tab unit 61 can also be arranged at a side position of the second straight portion, so that the first or second tab is in the middle position. It can be understood that the number of the first/second/third tab units can be set according to actual product requirements, and the application is not limited thereto.
  • At least one second winding unit 21 is spaced between two adjacent third tab units 61. From the perspective of the thickness direction of the electrode assembly 100, at least one second straight portion 211 is spaced between two adjacent third tab units 61, thereby increasing the distance between adjacent third tab units 61.
  • the electrode assembly 100 of the fifth embodiment is substantially the same as the first embodiment, the difference is that in the fifth embodiment, in the length direction of the electrode assembly 100, the first A tab unit 41 is located at the first end 104 of the electrode assembly 100, and the second tab unit 51 is located at the second end 105 of the electrode assembly 100. Therefore, in the length direction of the electrode assembly 100, the first tab 40 protrudes from the first end 104 of the electrode assembly 100, and the second tab 50 protrudes from the second end 105 of the electrode assembly 100.
  • the third tab unit 61 can be provided either at the first end 104 or at the second end 105.
  • FIG. 12 is an example where the third tab 60 extends from the first end 104, and does not limit the position of the third tab 60. As shown in FIG.
  • the plurality of first tab units 41, the plurality of second tab units 51 and the first pole piece 10 are integrally formed, and the plurality of third tab units 61 are integrated with the second pole piece 10.
  • the pole piece 20 is integrally formed.
  • the first tab unit 41 and the second tab unit 51 can be formed on the first pole piece 10 by cutting the raw material used to manufacture the first pole piece 10;
  • the raw material of the sheet 20 is such that the third tab unit 61 is formed on the second pole sheet 20.
  • the electrode assembly 100 includes a tab 80, and the first tab unit 41 and the second tab unit 51 are respectively The first end 81 and the second end 82.
  • the tab 80 is disposed on the first winding unit 11 of the first pole piece 10, and the first end 81 and the second end 82 of the tab 80 extend out of the first winding unit 11.
  • the tab 80 is substantially elongated, and the length of the tab 80 is greater than the length of the electrode assembly 100, so that the tab 80 can penetrate the electrode assembly 100, and the first tab 40 extends from the first of the electrode assembly 100.
  • the end 104 extends, and the second tab 50 extends from the second end 105 of the electrode assembly 100.
  • the tab 80 may also have a substantially U-shaped structure, so that the first tab 40 and the second tab 50 protrude from the same end of the electrode assembly 100.
  • the arrangement of the tab 80 is beneficial to simplify the installation process of the first tab 40 and the second tab 50.
  • the electrode assembly 100 of the sixth embodiment is substantially the same as the first embodiment, the difference is that in the sixth embodiment, the second pole piece 20 is also provided with a plurality of fourth tabs In the unit 71, in the thickness direction of the electrode assembly 100, the plurality of fourth tab units 71 are stacked to form a fourth tab.
  • the first tab 40, the second tab 50, the third tab 60, and the fourth tab protrude from the same end of the electrode assembly 100.
  • the arrangement of the fourth tab can further divide the current and improve the overcurrent capability of the electrode assembly 100.
  • the fourth tab unit 71 may also be disposed on the first tab 10, so that the electrode assembly 100 has three negative tabs and one positive tab, or three positive tabs and one negative tab.
  • the electrode assembly 100 of the seventh embodiment is substantially the same as the sixth embodiment, the difference is that in the seventh embodiment, in the length direction of the electrode assembly 100, the first tab 40 and The third tab 60 is located at the first end 104 of the electrode assembly 100, and the second tab 50 and the fourth tab are located at the second end 105 of the electrode assembly 100.
  • the third tab unit 61 and the fourth tab unit 71 may also be an integrally formed structure.
  • the electrode assembly 100 can also extend three tabs at one end and one tab at the other end, and the multiple tabs can be arranged and combined according to actual application scenarios.
  • the electrode assembly 100 of the eighth embodiment is substantially the same as the fifth embodiment.
  • one end of the first tab 40 protruding from the electrode assembly 100 is provided with two electrical connection portions 42
  • the two electrical connection portions 42 are spaced apart from each other and used to connect external circuits or electrical devices, so that the first tab 40 is divided into two tabs of the same polarity, so as to further divide the current and improve the flow rate of the electrode assembly 100.
  • the electrical connection portion 42 can be formed by welding a lug adapter on the first lug 40, or can be formed by cutting the first lug 40.
  • the number of electrical connection portions 42 on the first tab 40 may be more than two, and the application is not limited thereto.
  • multiple electrical connections may be provided on the second tab 50 and the third tab 60, and in this case, the second tab 50 can be omitted.
  • a ninth embodiment provides a battery 200, which includes a casing 201 and the electrode assembly 100 in any of the above embodiments, and the casing 201 accommodates the electrode assembly 100. Further, the battery 200 includes a plurality of electrode terminals 202 arranged on the outer surface of the housing 201, and each electrode terminal 202 is electrically connected to the first tab 40, the second tab 50, and The third tab 60.

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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)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种电极组件（100）和具有上述电极组件（100）的电池（200）。所述电极组件（100）包括第一极片（10）、第二极片（20）和隔离膜（30）。所述电极组件（100）由所述第一极片（10）、所述隔离膜（30）和所述第二极片（20）卷绕形成。所述第一极片（10）上设有由多个第一极耳单元（41）组成的第一极耳（40）和由多个第二极耳单元（51）组成的第二极耳（50），所述第二极片（20）上设有由多个第三极耳单元（61）组成的第三极耳（60）。上述电极组件（100）通过设置多极耳结构，实现提高电池过流能力、降低温升的目的。

Description

电极组件及电池 技术领域
本申请涉及电池领域，尤其涉及一种电极组件及具有该电极组件的电池。
背景技术
随着5G的应用，消费者对智能手机、平板电脑等便携式电子产品的电池性能要求越来越高。现有电池中存在电池及整机温升高的问题，过高的温度会降低电池和电子产品的使用性能。现有电池采用双极耳结构，电池的整体过流能力不能得到提升，因此电池和整机的温升仍然较高。
发明内容
鉴于上述状况，有必要提供一种能够提高电池过流能力、降低温升的电极组件和具有该电极组件的电池。
本申请提供一种电极组件，包括第一极片、第二极片和隔离膜。所述第二极片的极性与所述第一极片的极性相反，所述隔离膜设置在所述第一极片和所述第二极片之间。所述电极组件由所述第一极片、所述隔离膜和所述第二极片卷绕形成。所述第一极片上设有多个第一极耳单元和多个第二极耳单元，所述第二极片上设有多个第三极耳单元。沿所述电极组件的厚度方向上，所述多个第一极耳单元层叠设置形成第一极耳，所述多个第二极耳单元层叠设置形成第二极耳，所述多个第三极耳单元层叠设置形成第三极耳。三个极耳可以设置成两个正极一个负极，或两个负极一个正极，通过多极耳并联分流，降低电极组件的温升。
在一可选实施例中，沿所述电极组件的厚度方向上，所述第一极耳、所述第二极耳和所述第三极耳在垂直于所述电极组件的厚度方向的投影面上的投影不重叠，使电极组件在外观上表现出三个极耳结构。
进一步地，所述第一极片包括多个第一卷绕单元，所述多个第一极耳单元和所述多个第二极耳单元分布在所述多个第一卷绕单元上；所述第二极片包括多个第二卷绕单元，所述多个第三极耳单元分布在所述多个第二卷绕单元上；所述第一卷绕单元包括一个第一平直部和一个第一弯曲部，所述第二卷绕单元包括一个第二平直部和一个第二弯曲部，多个所述第一平直部与多个所述第二平直部交替层叠设置。
进一步地，相邻两个所述第一极耳单元之间间隔一层未设置所述第一极耳单元的第一平直部，定义所述未设置所述第一极耳单元的第一平直部为间隔层，可以避免第一极耳单元之间距离过近。
在一可选实施例中，所述第二极耳单元设置于所述间隔层，即所述第一极耳单元和所述第二极耳单元分别设置于不同的第一卷绕单元。
在一可选实施例中，所述电极组件包括卷绕起始端，在所述电极组件的厚度方向上，所述卷绕起始端将所述电极组件分为第一部分和第二部分；所述多个第一极耳单元设置于所述第一部分，所述多个第二极耳单元设置于所述第二部分，从而增加第一极耳与第二极耳之间的间距。
在一可选实施例中，至少一个所述第一卷绕单元上可以设有一个所述第一极耳单元和一个所述第二极耳单元。
在一可选实施例中，相邻两个所述第三极耳单元之间至少间隔一个第二卷绕单元，从而增加相邻第三极耳单元之间间距。
在一可选实施例中，每个所述第二卷绕单元上也可以设置一个 所述第三极耳单元。
在一可选实施例中，在所述电极组件的长度方向上，所述第一极耳单元位于所述电极组件的第一端，所述第二极耳单元位于所述电极组件的第二端。因此，在电极组件的长度方向上，第一极耳从电极组件的第一端伸出，第二极耳从电极组件的第二端伸出。
在一可选实施例中，所述电极组件包括极耳片，所述第一极耳单元与所述第二极耳单元分别为所述极耳片的第一端和第二端，所述极耳片设置于所述第一卷绕单元，所述极耳片的第一端和第二端伸出所述第一卷绕单元。极耳片的设置有利于简化第一极耳和第二极耳的安装过程。
在一可选实施例中，所述多个第一极耳单元、所述多个第二极耳单元与所述第一极片一体成型，所述多个第三极耳单元与所述第二极片一体成型。
在一可选实施例中，所述第一极片或所述第二极片上还设有多个第四极耳单元，沿所述电极组件的厚度方向上，所述多个第四极耳单元层叠设置形成第四极耳。所述第四极耳的设置可以进一步分化电流，提升电极组件的过流能力。
进一步地，在所述电极组件的长度方向上，所述第三极耳位于所述电极组件的第一端，所述第四极耳位于所述电极组件的第二端。
在一可选实施例中，沿所述电极组件的厚度方向，所述第三极耳在所述投影面上的投影位于所述第一极耳和所述第二极耳的投影之间。
在一可选实施例中，第一极耳伸出电极组件的一端设有至少两个电连接部，所述至少两个电连接部相互间隔并用于连接外部电路或用电装置，使第一极耳分化成两个相同极性的极耳，从而分进一步分化电流，提高电极组件的过流能力。
在一可选实施例中，上述第一极耳或者第三极耳的材质为铜、 镍，或者铜镀镍。
本申请还提供一种电池，包括壳体和电极组件，所述电极组件为上述任一项所述的电极组件，所述壳体收容所述电极组件。
进一步地，所述电池包括设置于所述壳体外表面的复数个电极端子，每个所述电极端子分别电连接所述第一极耳、所述第二极耳和所述第三极耳。
上述电极组件通过多个极耳单元随极片卷绕后形成第一极耳、第二极耳和第三极耳，使电极组件表现为多极耳结构，利用多极耳并联分流，实现提高电池过流能力、降低温升的目的。
附图说明
图1为电极组件的第一极片和第二极片在第一实施例中的展开结构示意图。
图2为电极组件在第一实施例中的卷绕结构示意图。
图3为电极组件在第一实施例中的外观结构示意图。
图4为第一极片和第二极片在第二实施例中的展开结构示意图。
图5为电极组件在第二实施例中的卷绕结构示意图。
图6为第一极片和第二极片在第三实施例中的展开结构示意图。
图7为电极组件在第三实施例中的卷绕结构示意图。
图8为第一极片和第二极片在第四实施例中的展开结构示意图。
图9为电极组件在第四实施例中的卷绕结构示意图。
图10为第一极片和第二极片在第五实施例中的展开结构示意图。
图11为电极组件在第五实施例中的侧面结构示意图。
图12为电极组件在第五实施例中的外观结构示意图。
图13为第一极片和第二极片在第六实施例中的展开结构示意图。
图14为电极组件在第六实施例中的卷绕结构示意图。
图15为第一极片和第二极片在第七实施例中的展开结构示意图。
图16为电极组件在第七实施例中的卷绕结构示意图。
图17为极耳折弯结构示意图。
图18为极耳片与第一极片的结构示意图。
图19为电极组件在第八实施例中的结构示意图。
图20为电池在第九实施例中的结构示意图。
主要元件符号说明：
电极组件                 100
卷绕起始端               101
第一部分                 102
第二部分                 103
第一端                   104
第二端                   105
第一极片                 10
第一卷绕单元             11
第一平直部               111
第一弯曲部               112
第二极片                 20
第二卷绕单元             21
第二平直部               211
第二弯曲部               212
隔离膜                   30
第一极耳                 40
第一极耳单元             41
电连接部                 42
第二极耳                 50
第二极耳单元             51
第三极耳                 60
第三极耳单元             61
第四极耳单元             71
极耳片                   80
第一端                   81
第二端                   82
具体实施方式：
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。当一个元件被认为是“设置于”另一个元件，它可以是直接设置在另一个元件上或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的。
除非另有定义，本文所使用的所有的技术和科学术语与属于本 申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请。本文所使用的术语“或/及”包括一个或多个相关的所列项目的任意的和所有的组合。
本申请提供一种电极组件，包括第一极片、第二极片和隔离膜。所述第二极片的极性与所述第一极片的极性相反，所述隔离膜设置在所述第一极片和所述第二极片之间。所述电极组件由所述第一极片、所述隔离膜和所述第二极片卷绕形成。所述第一极片上设有多个第一极耳单元和多个第二极耳单元，所述第二极片上设有多个第三极耳单元。沿所述电极组件的厚度方向上，所述多个第一极耳单元层叠设置形成第一极耳，所述多个第二极耳单元层叠设置形成第二极耳，所述多个第三极耳单元层叠设置形成第三极耳。
上述电极组件通过多个极耳单元随极片卷绕后形成第一极耳、第二极耳和第三极耳，使电极组件表现为多极耳结构，利用多极耳并联分流，实现提高电池过流能力、降低温升的目的。
本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施方式及实施方式中的特征可以相互组合。
第一实施例
请参阅图1、图2和图3，在一实施方式中，电极组件100包括第一极片10、第二极片20和隔离膜30。所述第二极片20的极性与所述第一极片10的极性相反，所述隔离膜30设置在所述第一极片10和所述第二极片20之间。所述电极组件100由所述第一极片10、所述隔离膜30和所述第二极片20卷绕形成。所述第一极片10上设有多个第一极耳单元41和多个第二极耳单元51，所述第二极片20上设有多个第三极耳单元61。图2中箭头A指示的方向为电极组件100的厚度方向。沿所述电极组件100的厚度方向上，所述多个第一极耳单元41层叠设置形成第一极耳40，所述多个第二极耳单元 51层叠设置形成第二极耳50，所述多个第三极耳单元61层叠设置形成第三极耳60。请参阅图17，多个极耳单元层叠设置后，会将多个极耳单元统一进行折弯处理，形成极耳，用于连接外部转接件或外部电路。
进一步地，沿所述电极组件100的厚度方向上，所述第一极耳40、所述第二极耳50和所述第三极耳60在垂直于所述电极组件的厚度方向的投影面上的投影不重叠，使电极组件100能够在外观上表现出三个极耳结构。三个极耳可以设置成两个正极一个负极，或两个负极一个正极，通过多极耳并联分流，降低电极组件的温升。根据本申请的一个实施例，负极耳的材质可以选择铜、镍，或者铜镀镍。由于第一极耳单元41和第二极耳单元51设置于第一极片10，第三极耳单元61设置于第二极片20，所以第一极耳40和第二极耳50的极性与第一极片10相同，第三极耳60的极性与第二极片20相同。
所述第一极片10包括多个第一卷绕单元11，所述多个第一极耳单元41和所述多个第二极耳单元51分布在所述多个第一卷绕单元11上。所述第二极片20包括多个第二卷绕单元21，所述多个第三极耳单元61分布在所述多个第二卷绕单元21上。所述第一卷绕单元11包括一个第一平直部111和一个第一弯曲部112，所述第二卷绕单元21包括一个第二平直部211和一个第二弯曲部212，多个所述第一平直部111与多个所述第二平直部211交替层叠设置。图1的极片展开结构示意图中表示的卷绕单元仅仅是示范，多个第一/第二卷绕单元的长度可以不相同，根据实际卷绕情况决定。
进一步地，至少一个所述第一卷绕单元11上设有一个所述第一极耳单元41和一个所述第二极耳单元51。所述电极组件100包括卷绕起始端101，在所述电极组件100的厚度方向上，所述卷绕起始端101将所述电极组件100分为第一部分102和第二部分103， 具体地，卷绕起始端101以下的部分为第一部分102，卷绕起始端101以上的部分为第二部分103。
在第一实施例中，在第一极片10展开情况下对第一卷绕单元11排序，第一极耳单元41和第二极耳单元51均设置于第奇数个第一卷绕单元11。在第二极片20展开情况下对第二卷绕单元21排序，第三极耳单元61设置于第奇数个第二卷绕单元21。因而卷绕过程完成后，第一极耳单元41、第二极耳单元51和第三极耳单元61均设置于所述第一部分102。在第一部分102中，每一层第一平直部111上设置一个第一极耳单元41和一个第二极耳单元51，每一层第二平直部211上设置一个第三极耳单元61。此时第一极耳40、第二极耳50和第三极耳60均位于第一部分102，可以同时将多个极耳进行折弯，降低制造过程的工艺复杂性。
请再次参阅图3，沿所述电极组件的厚度方向，所述第三极耳60在所述投影面上的投影位于所述第一极耳40和所述第二极耳50的投影之间。可以理解，在其他实施例中，第一极耳40可以位于第三极耳60和第二极耳50之间，或第二极耳50位于第一极耳40和第三极耳60之间，本申请不限定于此。图3中箭头C指示的方向为电极组件100的长度方向，在第一实施例中，第一极耳40、第二极耳50和第三极耳60均从电极组件100长度方向上的第一端104伸出。在其他实施例中，第一极耳40、第二极耳50和第三极耳60可以从电极组件100长度方向上的第二端105伸出。
第二实施例
请参阅图4和图5，第二实施例的电极组件100与第一实施例大致相同，区别在于，第二实施例中，在第一极片10展开情况下对第一卷绕单元11排序，第一极耳单元41和第二极耳单元51均设置于第偶数个第一卷绕单元11。在第二极片20展开情况下对第二卷绕单元21排序，第三极耳单元61设置于第偶数个第二卷绕单元21。 因而卷绕过程完成后，第一极耳单元41、第二极耳单元51和第三极耳单元61均设置于所述第二部分103。第二实施例的电极组件100中与第一实施例大致相同的其他结构此处不再赘述。
可以理解，在另一可选实施例中，第一极耳单元41设置于第奇数个第一卷绕单元11，第二极耳单元51设置于第偶数个第一卷绕单元11，此时所述多个第一极耳单元41设置于所述第一部分102，所述多个第二极耳单元51设置于所述第二部分103，从而增加第一极耳40与第二极耳50之间的间距，避免第一极耳40和第二极耳50在制造或折弯过程中发生干涉，降低制造难度。在该情形下，第三极耳单元61既可以设置于第一部分102或第二部分103，也可以同时设置于第一部分102和第二部分103。
第三实施例
请参阅图6和图7，第三实施例的电极组件100与第一实施例大致相同，区别在于，第三实施例中每个第一卷绕单元11上都设置一个第一极耳单元41和一个第二极耳单元51，每个所述第二卷绕单元21上设置一个所述第三极耳单元61。此时，电极组件100的第一部分102和第二部分103均设有第一极耳单元41、第二极耳单元51及第三极耳单元61，第一极耳40、第二极耳50和第三极耳60的厚度增加，能够有效降低电极组件100的内阻。第三实施例的电极组件100中与第一实施例大致相同的其他结构此处不再赘述。
第四实施例
请参阅图8和图9，第四实施例的电极组件100与第一实施例大致相同，区别在于，第四实施例中，相邻两个所述第一极耳单元41之间间隔一层未设置所述第一极耳单元41的第一平直部111，定义所述未设置第一极耳单元41的第一平直部111为间隔层。所述第二极耳单元51设置于所述间隔层，即所述第一极耳单元41和所述第二极耳单元51分别设置于不同的第一卷绕单元11。一方面，此 种设置方式适用于电极组件100宽度方向(图2中箭头B指示的方向)尺寸较小的情况，可以避免第一极耳单元41与第二极耳单元51距离过近，提高电极组件100的可制造性。另一方面，间隔层的设置可以避免多个极耳单元之间距离过近，影响极耳的散热性能。
从图9的视角来看，第一极耳单元41大致设置于第一层第一平直部111的左侧，第二极耳单元51大致设置于间隔层的右侧。第三极耳单元61大致设置于第二平直部211的中部，并且电极组件100的第一部分102中，每层第二平直部211上都设置一个第三极耳单元61，使第三极耳60位于第一极耳40和第二极耳50之间。在第四实施例中，第一极耳单元41、第二极耳单元51和第三极耳单元61均设置于第一部分102，在其他实施例中，第一极耳单元41、第二极耳单元51和第三极耳单元61还可以设置于第二部分103，或同时设置于第一部分102和第二部分103。第三极耳单元61也可以设置于第二平直部的侧边位置，使第一或第二极耳处于中间位置。可以理解，第一/第二/第三极耳单元的数量可以根据实际产品需求进行设置，本申请不限定于此。
在另一可选实施例中，相邻两个所述第三极耳单元61之间至少间隔一个第二卷绕单元21。从电极组件100的厚度方向看，相邻两个第三极耳单元61之间至少间隔一层第二平直部211，从而增加相邻第三极耳单元61之间间距。
第五实施例
请参阅图10、图11和图12，第五实施例的电极组件100与第一实施例大致相同，区别在于，第五实施例中，在所述电极组件100的长度方向上，所述第一极耳单元41位于所述电极组件100的第一端104，所述第二极耳单元51位于所述电极组件100的第二端105。因此，在电极组件100的长度方向上，第一极耳40从电极组件100的第一端104伸出，第二极耳50从电极组件100的第二端105伸出。 在本实施例中，第三极耳单元61既可以设置在第一端104，也可以设置在第二端105。图12是以第三极耳60从第一端104伸出作为示例，并非对第三极耳60的位置限定。
进一步地，所述多个第一极耳单元41、所述多个第二极耳单元51与所述第一极片10一体成型，所述多个第三极耳单元61与所述第二极片20一体成型。具体地，可以通过裁切用于制造第一极片10的原材料，使第一极耳单元41和第二极耳单元51形成在第一极片10上；通过裁切用于制造第二极片20的原材料，使第三极耳单元61形成在第二极片20上。
在一可选实施例中，请参阅图18，所述电极组件100包括极耳片80，所述第一极耳单元41与所述第二极耳单元51分别为所述极耳片80的第一端81和第二端82。所述极耳片80设置于所述第一极片10的所述第一卷绕单元11，所述极耳片80的第一端81和第二端82伸出所述第一卷绕单元11。具体地，极耳片80大致呈长条形，极耳片80的长度大于电极组件100的长度，从而使极耳片80能够贯穿电极组件100，第一极耳40从电极组件100的第一端104伸出，第二极耳50从电极组件100的第二端105伸出。在另一实施例中，极耳片80还可以大致呈U型结构，使第一极耳40和第二极耳50从电极组件100的同一端伸出。
极耳片80的设置有利于简化第一极耳40和第二极耳50的安装过程。
第六实施例
请参阅图13和图14，第六实施例的电极组件100与第一实施例大致相同，区别在于，第六实施例中，所述第二极片20上还设有多个第四极耳单元71，沿所述电极组件100的厚度方向上，所述多个第四极耳单元71层叠设置形成第四极耳。第一极耳40、第二极耳50、第三极耳60和第四极耳从所述电极组件100的同一端伸出。 所述第四极耳的设置可以进一步分化电流，提升电极组件100的过流能力。在其他实施例中，第四极耳单元71还可以设置于第一极片10，使电极组件100具有三个负极耳和一个正极耳，或者具有三个正极耳和一个负极耳。
第七实施例
请参阅图15和图16，第七实施例的电极组件100与第六实施例大致相同，区别在于，第七实施例中，在所述电极组件100的长度方向上，第一极耳40和第三极耳60位于所述电极组件100的第一端104，第二极耳50和第四极耳位于所述电极组件100的第二端105。可以理解，第三极耳单元61和第四极耳单元71也可以是一体成型结构。在其他实施例中，电极组件100还可以一端伸出三个极耳，另一端伸出一个极耳，多个极耳之间可以根据实际应用场景进行排列组合。
第八实施例
请参阅图19，第八实施例的电极组件100与第五实施例大致相同，区别在于，第八实施例中，第一极耳40伸出电极组件100的一端设有两个电连接部42，所述两个电连接部42相互间隔并用于连接外部电路或用电装置，使第一极耳40分化成两个相同极性的极耳，从而分进一步分化电流，提高电极组件100的过流能力。所述电连接部42可以通过在第一极耳40上焊接极耳转接件形成，也可以通过裁切第一极耳40形成。可以理解，在其他实施例中，第一极耳40上的电连接部42的数量可以多于两个，本申请不限定于此。以此类推，第二极耳50、第三极耳60上也可以设多个电连接部，并且在此情况下，第二极耳50可以省略。
第九实施例
请参阅图20，第九实施例提供一种电池200，包括壳体201和上述任一实施例中的电极组件100，所述壳体201收容所述电极组 件100。进一步地，所述电池200包括设置于所述壳体201外表面的复数个电极端子202，每个所述电极端子202分别电连接所述第一极耳40、所述第二极耳50和所述第三极耳60。
以上实施方式仅用以说明本申请的技术方案而非限制，尽管参照以上较佳实施方式对本申请进行了详细说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换都不应脱离本申请技术方案的精神和范围。

Claims (19)

  1. 一种电极组件，包括：
    第一极片；
    第二极片，所述第二极片的极性与所述第一极片的极性相反；和
    隔离膜，设置在所述第一极片和所述第二极片之间；
    所述电极组件由所述第一极片、所述隔离膜和所述第二极片卷绕形成；其特征在于，
    所述第一极片上设有多个第一极耳单元和多个第二极耳单元，所述第二极片上设有多个第三极耳单元；
    沿所述电极组件的厚度方向上，所述多个第一极耳单元层叠设置形成第一极耳，所述多个第二极耳单元层叠设置形成第二极耳，所述多个第三极耳单元层叠设置形成第三极耳。
  2. 如权利要求1所述的电极组件，其特征在于，沿所述电极组件的厚度方向上，所述第一极耳、所述第二极耳和所述第三极耳在垂直于所述电极组件的厚度方向的投影面上的投影不重叠。
  3. 如权利要求2所述的电极组件，其特征在于，所述第一极片包括多个第一卷绕单元，所述多个第一极耳单元和所述多个第二极耳单元分布在所述多个第一卷绕单元上；所述第二极片包括多个第二卷绕单元，所述多个第三极耳单元分布在所述多个第二卷绕单元上；所述第一卷绕单元包括一个第一平直部和一个第一弯曲部，所述第二卷绕单元包括一个第二平直部和一个第二弯曲部，多个所述第一平直部与多个所述第二平直部交替层叠设置。
  4. 如权利要求3所述的电极组件，其特征在于，相邻两个所述第一极耳单元之间间隔一层未设置所述第一极耳单元的第一平直部，定义所述未设置所述第一极耳单元的第一平直部为间隔层。
  5. 如权利要求4所述的电极组件，其特征在于，所述第二极耳单元 设置于所述间隔层。
  6. 如权利要求3所述的电极组件，其特征在于，所述电极组件包括卷绕起始端，在所述电极组件的厚度方向上，所述卷绕起始端将所述电极组件分为第一部分和第二部分；所述多个第一极耳单元设置于所述第一部分，所述多个第二极耳单元设置于所述第二部分。
  7. 如权利要求3所述的电极组件，其特征在于，至少一个所述第一卷绕单元上设有一个所述第一极耳单元和一个所述第二极耳单元。
  8. 如权利要求3-7任一项所述的电极组件，其特征在于，相邻两个所述第三极耳单元之间至少间隔一个第二卷绕单元。
  9. 如权利要求3-7任一项所述的电极组件，其特征在于，每个所述第二卷绕单元上设置一个所述第三极耳单元。
  10. 如权利要求3-7任一项所述的电极组件，其特征在于，在所述电极组件的长度方向上，所述第一极耳单元位于所述电极组件的第一端，所述第二极耳单元位于所述电极组件的第二端。
  11. 如权利要求3所述的电极组件，其特征在于，所述电极组件包括极耳片，所述第一极耳单元与所述第二极耳单元分别为所述极耳片的第一端和第二端，所述极耳片设置于所述第一卷绕单元，所述极耳片的第一端和第二端伸出所述第一卷绕单元。
  12. 如权利要求1所述的电极组件，其特征在于，所述多个第一极耳单元、所述多个第二极耳单元与所述第一极片一体成型，所述多个第三极耳单元与所述第二极片一体成型。
  13. 如权利要求1所述的电极组件，其特征在于，所述第一极片或所述第二极片上还设有多个第四极耳单元，沿所述电极组件的厚度方向上，所述多个第四极耳单元层叠设置形成第四极耳。
  14. 如权利要求13所述的电极组件，其特征在于，在所述电极组件的长度方向上，所述第三极耳位于所述电极组件的第一端，所述第四极耳位于所述电极组件的第二端。
  15. 如权利要求2所述的电极组件，其特征在于，沿所述电极组件的厚度方向，所述第三极耳在所述投影面上的投影位于所述第一极耳和所述第二极耳的投影之间。
  16. 如权利要求1所述的电极组件，其特征在于，所述第一极耳伸出所述电极组件的一端设有至少两个电连接部，所述至少两个电连接部相互间隔并用于连接外部电路。
  17. 如权利要求1所述的电极组件，其特征在于，所述第一极耳或所述第三极耳的材质为铜、镍，或者铜镀镍。
  18. 一种电池，包括壳体和电极组件，其特征在于，所述电极组件为权利要求1-17任一项所述的电极组件，所述壳体收容所述电极组件。
  19. 如权利要求18所述的电池，其特征在于，所述电池包括设置于所述壳体外表面的复数个电极端子，每个所述电极端子分别电连接所述第一极耳、所述第二极耳和所述第三极耳。
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