WO2022052120A1 - 电化学装置及电子装置 - Google Patents

电化学装置及电子装置 Download PDF

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Publication number
WO2022052120A1
WO2022052120A1 PCT/CN2020/115133 CN2020115133W WO2022052120A1 WO 2022052120 A1 WO2022052120 A1 WO 2022052120A1 CN 2020115133 W CN2020115133 W CN 2020115133W WO 2022052120 A1 WO2022052120 A1 WO 2022052120A1
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WO
WIPO (PCT)
Prior art keywords
electrode assembly
tab
tabs
pole piece
current collector
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Application number
PCT/CN2020/115133
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English (en)
French (fr)
Inventor
金娟
蔡阳声
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.)
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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/CN2020/115133 priority Critical patent/WO2022052120A1/zh
Priority to CN202080010849.0A priority patent/CN113366682B/zh
Publication of WO2022052120A1 publication Critical patent/WO2022052120A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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

  • the present application relates to 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.
  • the electrochemical device will generate a lot of heat in the process of high current charge and discharge.
  • due to the different heat dissipation conditions inside and outside the electrochemical device there will also be a large temperature difference. performance has an impact.
  • a heat-conducting sheet is generally arranged inside an electrochemical device, and the internal heat is dissipated through the heat-conducting sheet.
  • disposing the heat conducting sheet inside the electrochemical device can speed up the internal heat dissipation, but it will reduce the energy density of the electrochemical device.
  • one aspect of the present application is to propose an electrochemical device that can improve the temperature difference between the inner and outer sides of the electrode assembly under high-rate charge and discharge, while reducing energy density loss.
  • the embodiments of the present application provide an electrochemical device including an electrode assembly.
  • the electrode assembly includes a first pole piece, a second pole piece, a separator, at least one first recess and a plurality of first tabs.
  • the isolation film is disposed between the first pole piece and the second pole piece.
  • the first pole piece includes a first current collector and a first active material layer disposed on the first current collector.
  • the second pole piece includes a second current collector and a second active material layer disposed on the second current collector.
  • the first concave portion is arranged on the second pole piece, the plurality of first tabs are formed by the first current collector, and the plurality of first tabs are electrically connected to each other. In the thickness direction of the electrode assembly, a first concave portion is provided between the two first tabs.
  • the electrode assembly further includes at least one second recess and a plurality of second tabs.
  • the second concave portion is arranged on the first pole piece, a plurality of second tabs are formed by a second current collector, and the plurality of second tabs are electrically connected to each other.
  • a second recess is provided between the two second tabs.
  • the width of the first tab near the inside of the electrode assembly is greater than or equal to the width of the first tab near the outside of the electrode assembly.
  • the width of the first concave portion close to the inner side of the electrode assembly is greater than or equal to the width of the first concave portion close to the outer side of the electrode assembly.
  • the widths of the first tabs that are symmetrical in the thickness direction of the electrode assembly are the same.
  • the first tab in the width direction of the electrode assembly, includes a first side and a second side. There is a gap between at least one of the first side or the second side and the first current collector provided with the first active material layer.
  • the first tab is not provided with the first active material layer.
  • the isolation membrane is provided with a plurality of third recesses.
  • the projection of the third recess is located within the projection of the first recess and the first tab adjacent to the third recess.
  • the electrode assembly further includes a fourth concave portion, the fourth concave portion is disposed on the first pole piece, and the fourth concave portion is disposed between the two first pole tabs.
  • the electrode assembly further includes a first tab.
  • the first tab piece is electrically connected to the first tab.
  • one end of the first tab includes a plurality of first sub tabs, and each of the first sub tabs is electrically connected to the first tab.
  • the width of the first sub-tab tab near the inner side of the electrode assembly is greater than the width of the first sub-tab tab near the outer side of the electrode assembly.
  • the sum of the thicknesses of the plurality of first sub-tab tabs is equal to the thickness of the other end of the first tab tabs.
  • the plurality of first recesses and the plurality of second recesses are provided at the same end or different ends of the electrode assembly.
  • the electrode assembly is a wound or laminated structure.
  • the electrode assembly is a winding structure, and in the winding direction, the width of the first tab near the starting end of the electrode assembly is greater than the width of the first tab far from the starting end of the electrode assembly.
  • the plurality of first tabs are welded or bonded with conductive glue.
  • Another aspect of the present application is to provide an electronic device including the above electrochemical device.
  • the tabs and the current collector are integrally formed, and the projections of a plurality of tabs and concave portions of the same polarity along the thickness direction of the cell have overlapping areas, which can improve the electrochemical device in high-speed operation.
  • the inner and outer temperature difference under the rate charge and discharge, the electrode lug and the electrode lug welding area are all arranged inside the electrode piece to reduce the energy density loss of the electrochemical device.
  • 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 a first pole piece according to an embodiment of the present application
  • FIG. 3 shows a schematic structural diagram of a second pole piece according to an embodiment of the present application
  • FIG. 4 shows a schematic structural diagram of an isolation film according to an embodiment of the present application
  • FIG. 5 shows a top view of an electrode assembly according to an embodiment of the present application from a first viewing angle
  • FIG. 6 shows a schematic structural diagram of a first pole piece according to another embodiment of the present application.
  • FIG. 7 shows a schematic structural diagram of a second pole piece according to another embodiment of the present application.
  • FIG. 8 shows a schematic structural diagram of a first pole piece according to another embodiment of the present application.
  • FIG. 9 shows a schematic structural diagram of a second pole piece according to another embodiment of the present application.
  • FIG. 10 shows a schematic structural diagram of an electrode assembly according to yet another embodiment of the present application.
  • FIG. 11 shows a schematic structural diagram of a first tab piece and a second tab piece according to an embodiment of the present application
  • FIG. 12 shows a flowchart of a method for manufacturing an electrode assembly according to an embodiment of the present application
  • FIG. 13 shows a schematic diagram of a module of an electrochemical device according to an embodiment of the present application.
  • FIG. 14 shows a schematic diagram of a module of an electronic device according to an embodiment of the present application.
  • the electrode assembly 100 according to the embodiment of the present application will be described in detail below with reference to FIGS. 1 to 11 .
  • an electrode assembly 100 includes a first pole piece 10 , an 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 disposed on the first current collector 101 .
  • the second pole piece 30 includes a second current collector 301 and a second active material layer 302 disposed on the second current collector 301 .
  • the electrode assembly 100 may be formed by winding the first pole piece 10 , the isolation film 20 and the second pole piece 30 , or may be formed by laminating the first pole piece 10 , the isolation film 20 and the second pole piece 30 .
  • the first active material layer 102 may be provided on both sides of the first current collector 101 , or only on one side of the first current collector 101 .
  • the second active material layer 302 may be provided on both sides of the second current collector 3011 , or only on one side of the second current collector 301 .
  • the first pole piece 10 is a positive pole piece, the first current collector 101 is a positive electrode current collector, and the first active material layer 102 is a positive electrode active material layer.
  • the second pole piece 30 is a negative pole piece, the second current collector 301 is a negative electrode current collector, and the second active material layer 302 is a negative electrode active material layer.
  • the first pole piece 10 is a negative pole piece, the first current collector 101 is a negative electrode current collector, and the first active material layer 102 is a negative electrode active material layer.
  • the second pole piece 30 is a positive pole piece, the second current collector 301 is a positive electrode current collector, and the second active material layer 302 is a positive electrode active material layer.
  • the plurality of first tabs 103 are formed by the first current collector 101 of the first pole piece 10 , that is, the first tabs 103 and the first current collector 101 are integrally formed, so that the The heat inside the electrode assembly 100 can be dissipated more quickly.
  • the first pole piece 10 may further include at least one second concave portion 104 , and the first tab 103 and the second concave portion 104 may be arranged in an intersecting manner.
  • the first active material layer 102 may be disposed on the first current collector 101 first to form the first pole piece 10 , and then the first active material layers of the plurality of pre-set tab regions on the first pole piece 10 may be formed. 102 is cleaned off, and the exposed first current collector 101 after cleaning is used as a plurality of first tabs 103 . It is also possible to first paste adhesive paper on the first current collector 101 at intervals, and then set the first active material layer 102 on the first current collector 101 to form the first pole piece 10, and then remove these adhesive papers, and then the first electrode can be placed on the first electrode. The sheet 10 forms a plurality of first tabs 103 .
  • the first active material layer 102 when the first active material layer 102 is disposed on the first current collector 101 , the first current collector 101 and the first active material in at least one predetermined area of the first pole piece 10 may be pre-set.
  • the material layer 102 is cut out, thereby forming at least one second recess 104 .
  • the plurality of first tabs 103 may also be formed by empty foil regions of the first current collector 101 , that is, the first tabs do not need to be obtained by removing the first active material layer 102 on the first current collector 101 103, while the empty foil area of the first current collector 101 is directly used.
  • the plurality of second tabs 303 are formed by the second current collector 301 of the second pole piece 30 , that is, the second tabs 303 and the second current collector 301 are integrally formed, so that the heat inside the electrode assembly 100 can be reduced Export faster.
  • the second pole piece 30 may further include at least one first concave portion 304 , and the second pole tab 303 and the first concave portion 304 may be arranged crosswise.
  • the second active material layer 302 may be firstly disposed on the second current collector 301 to form the second pole piece 30 , and then the second active material layers of the plurality of pre-set tab regions on the second pole piece 30 may be formed. 302 is cleaned, and the exposed second current collector 301 after cleaning is used as a plurality of second tabs 303 . It is also possible to first paste adhesive paper on the second current collector 301 at intervals, and then set the second active material layer 302 on the second current collector 301 to form the second pole piece 30, and then remove these adhesive papers, and then the second electrode Sheet 30 forms a plurality of second tabs 303 .
  • the second active material layer 302 when the second active material layer 302 is disposed on the second current collector 301 , the second current collector 301 and the second active material in at least one predetermined area on the second pole piece 30 may be pre-set.
  • the material layer 302 is cut out, thereby forming at least one first recess 304 .
  • the plurality of second tabs 303 may also be formed by the empty foil regions of the second current collector 301 , that is, the second tabs do not need to be obtained by removing the second active material layer 302 on the second current collector 301 303 , using the empty foil area of the second current collector 301 directly.
  • the isolation film 20 is provided with a plurality of third recesses 201 .
  • the width W3 of the third recess 201 is less than or equal to the width W1 of the first recess 304 adjacent thereto, and is less than or equal to the width W2 of the second recess 104 adjacent thereto.
  • the depth H3 of the third recess 201 is less than or equal to the depth H1 of the first recess 304 adjacent to it, and is less than or equal to the depth H2 of the second recess 104 adjacent thereto, thereby avoiding the first pole piece 10 and the second pole A short circuit occurs between the sheets 30 .
  • FIG. 5 it is a top view of the electrode assembly 100 from a first viewing angle, and the line-of-sight direction of the first viewing angle is perpendicular to the first direction X1 .
  • the electrode assembly 100 is formed by winding the first pole piece 10 , the separator 20 and the second pole piece 30 .
  • the plurality of first recesses 304 and the plurality of second recesses 104 are located at the same end of the electrode assembly 100 .
  • the projections of each of the first concave portions 304 and each of the first tabs 103 on the first direction X1 of the electrode assembly 100 have an overlap region, so that the plurality of first tabs 103 can be electrically connected to each other.
  • each of the second recesses 104 and each of the second tabs 303 on the first direction X1 of the electrode assembly 100 also have an overlapping area, so that the plurality of second tabs 303 can be electrically connected to each other.
  • the plurality of first concave portions 304 and the plurality of second concave portions 104 may also be located at opposite ends of the electrode assembly 100 . At this time, the direction of one end of the electrode assembly 100 is parallel to the line-of-sight direction of the first viewing angle.
  • the first direction X1 can be selected as the thickness direction of the electrode assembly 100 .
  • the first pole piece 10 shown in FIG. 2 , the second pole piece 30 shown in FIG. 3 , and the separator 20 shown in FIG. 4 can be used to roll the electrode assembly 100 shown in FIG. 5 .
  • the first pole piece 10 shown in FIG. 6 , the second pole piece 30 shown in FIG. 7 , and the isolation film 20 shown in FIG. 4 can also be used to roll the electrode assembly 100 .
  • the width of the first tab 103 near the inner side of the electrode assembly 100 is greater than or equal to the width of the first tab 103 near the outer side of the electrode assembly 100
  • the width of the second tab 303 near the inner side of the electrode assembly 100 The width is greater than or equal to the width of the second tab 303 near the outer side of the electrode assembly 100 .
  • the width of the first concave portion 304 close to the inner side of the electrode assembly 100 is greater than or equal to the width of the first concave portion 304 close to the outer side of the electrode assembly 100
  • the width of the second concave portion 104 close to the inner side of the electrode assembly 100 is greater than or equal to the width close to the outer side of the electrode assembly 100 the width of the second recess 104 .
  • the inner side of the electrode assembly 100 refers to the inner layer position of the electrode assembly 100
  • the outer side of the electrode assembly 100 refers to the outer layer position of the electrode assembly 100 .
  • the widths of the plurality of first tabs 103 gradually decrease from the inner side to the outer side of the electrode assembly 100
  • the widths of the plurality of first concave portions 304 vary from the inner side to the outer side of the electrode assembly 100 .
  • the widths of the plurality of second tabs 303 gradually decrease from the inner side to the outer side of the electrode assembly 100
  • the widths of the plurality of second concave portions 104 gradually decrease and change from the inner side to the outer side of the electrode assembly 100 .
  • the width of the tab area inside the electrode assembly 100 is wider, the current density of the tab is small, the current collector area where the active material layer is arranged is relatively small, and the heat generation inside the electrode assembly 100 is less.
  • the wider tabs can improve the thermal conductivity and heat dissipation performance inside the electrode assembly 100, while the outside of the electrode assembly 100 is easier to dissipate heat, the width of the tab area is narrow, and the active material layer is provided with a relatively large current collector area, which can provide more energy density.
  • the width of the tabs (first tab 103 , second tab 303 ) or the recesses (first recess 304 , second recess 104 ) gradually decreases from the inside to the outside of the electrode assembly 100 may be The finger width decreases sequentially from the inside to the outside of the electrode assembly 100 , or the widths of several adjacent layers do not change, but the width generally decreases from the inside to the outside of the electrode assembly 100 .
  • the widths of the first positive electrode tabs to the fifth positive electrode tabs decrease in sequence, from the center of the electrode assembly 100 to the fifth positive electrode tabs.
  • the second outer side is the sixth positive electrode tab to the tenth positive electrode tab in sequence, and the width of the sixth positive electrode tab to the tenth positive electrode tab decreases in sequence.
  • the width of the first positive electrode tab is greater than that of the second positive electrode tab, and the width of the second positive electrode tab is equal to the width of the third positive electrode tab.
  • the width of the tabs, the widths from the third positive tab to the sixth positive tab decrease in sequence, from the center of the electrode assembly 100 to the second outer side are the seventh positive tab to the twelfth positive tab, the seventh positive tab
  • the width of the tab is greater than that of the eighth positive tab
  • the width of the eighth positive tab is equal to the width of the ninth positive tab
  • the widths from the ninth positive tab to the twelfth positive tab decrease sequentially.
  • the widths of the first tabs 103 symmetrical on both sides of the electrode assembly 100 are the same, and the widths of the second tabs 303 symmetrical on both sides of the electrode assembly 100 are the same.
  • the first tabs 103 with the same distance from the center of the electrode assembly 100 in the thickness direction can have the same heat dissipation capacity, which is beneficial in improving the heat dissipation performance of the electrode assembly 100 .
  • the influence of disposing the first tab 103 on the energy density can be reduced.
  • the widths of the first tabs 103 symmetrical on both sides of the electrode assembly 100 may also be different, and the widths of the second tabs 303 symmetrical on both sides of the electrode assembly 100 may also be different.
  • bilateral symmetry of the electrode assembly 100 refers to symmetry along the thickness direction of the electrode assembly 100 .
  • the electrode assembly 100 is a winding structure, and in the winding direction of the electrode assembly 100 , the width of the first tab 103 near the winding start end of the winding structure is larger than that of the winding up away from the winding structure The width of the first tab 103 at the beginning. That is, in the winding direction of the electrode assembly 100 , the widths of the plurality of first tabs 100 decrease sequentially. After the winding structure is formed, the widths of the symmetrical first tabs 103 on both sides of the electrode assembly 100 are different. Although the heat dissipation performance of one side is reduced, the corresponding active material layer is provided with an increased area, which improves the energy density. . In other embodiments, in the winding direction of the electrode assembly 100 , the width of the second tab 303 close to the winding start end of the winding structure is larger than the width of the second tab 303 far from the winding start end of the winding structure width.
  • N is an integer greater than zero
  • the number of the first tabs 103 can be less than or equal to N/2
  • the number of the second tabs 303 can be less than or equal to N /2.
  • the electrode assembly 100 further includes a fourth concave portion (not shown), the fourth concave portion is disposed on the first pole piece 10 , and the fourth concave portion is disposed between the two first pole tabs 103 . That is, the first concave portion 304 and the fourth concave portion are disposed between the two first tabs 103 , that is, not every layer of the first pole piece 10 in the electrode assembly 100 is provided with the first tab 103 . Under the condition that the heat dissipation requirements are met, the number of the first tabs 103 electrically connected to each other can be reduced, the electrical connection reliability of the first tabs 103 can be improved, the process complexity can be reduced, and the productivity can be improved.
  • the electrode assembly 100 further includes a fifth concave portion (not shown), the fifth concave portion is disposed on the second pole piece 30 , and the fifth concave portion is disposed between the two second pole tabs 303 . That is, the second concave portion 104 and the fifth concave portion are disposed between the two second tabs 303 , that is, not every second pole piece 30 of each layer of the electrode assembly 100 is disposed with the second tab 303 . Under the condition that the heat dissipation requirements are met, the number of the first tabs 103 electrically connected to each other can be reduced, the electrical connection reliability of the first tabs 103 can be improved, the process complexity can be reduced, and the productivity can be improved.
  • the plurality of first tabs 103 may be electrically connected by welding or conductive glue, and the plurality of second tabs 303 may also be electrically connected by welding or conductive glue.
  • the projection of the third concave portion 201 is located within the projection of the first concave portion 304 and the first tab 103 adjacent to the third concave portion 201 .
  • the projection of the third recess 201 is located within the projection of the second recess 104 and the second tab 303 adjacent to the third recess 201 .
  • the first pole tab 103 may further include a first side edge 1031 and a second side edge 1032 along the width direction W11 , the width direction W11 is the direction in which the first pole piece 10 extends, and the width direction W11 is not the first side edge 1031 A direction in which the tab 103 or the second concave portion 104 faces.
  • first gap 1033 between the first side 1031 and the second side 1032 and the first current collector 101 provided with the first active material layer 102, so that the first tab 103 can move relatively freely, and can reduce the The pulling force on the first current collector 101 provided with the first active material layer 102 when the first tab 103 is welded.
  • the width of the first tab or the first recess refers to the width along the width direction W11.
  • the second pole tab 303 may further include a third side edge 3031 and a fourth side edge 3032, and the width direction W12 is the direction in which the second pole piece 30 extends, And the width direction W12 is not the direction in which the second tab 303 or the first concave portion 304 faces.
  • the width of the second tab or the second recess refers to the width along the width direction W12.
  • the electrode assembly 100 further includes a first tab 40 and a second tab 50 .
  • the first tabs 40 are electrically connected to the plurality of first tabs 103
  • the second tabs 50 are electrically connected to the plurality of second tabs 303 .
  • the first concave portion 304 , the second concave portion 104 , and the third concave portion 201 are not shown.
  • one end of the first tab 40 is bifurcated into a plurality of first sub tabs 401 with different widths, and each first sub tab 401 is electrically connected to at least one
  • the number of the first tabs 103 and the first sub-tabs 401 can be set according to actual requirements. For example, one end of the first tabs 40 is forked into four first sub-tabs 401 with different widths.
  • the wider first sub-pole tabs 401 can be electrically connected to the first tabs 103 on the inner side of the electrode assembly 100
  • the narrower first sub-pole tabs 401 can be electrically connected to the first tabs on the outer side of the electrode assembly 100 .
  • the width of the first sub-tab tab 401 near the inner side of the electrode assembly 100 is greater than the width of the first sub-tab tab 401 near the outer side of the electrode assembly 100 .
  • One end of the second tab 50 is bifurcated into a plurality of second sub tabs 501 with different widths.
  • Each second sub tab 501 is electrically connected to at least one second tab 303 .
  • the number of 501 can be set according to actual requirements, for example, one end of the second tab 50 is forked into four second sub tabs 501 with different widths.
  • the wider second sub-pole tabs 501 can be electrically connected to the second tabs 303 on the inner side of the electrode assembly 100 , and the narrower second sub-pole tabs 501 can be electrically connected to the second tabs on the outer side of the electrode assembly 100 .
  • 303 that is, the width of the second sub-tab tab 501 near the inner side of the electrode assembly 100 is greater than the width of the second sub-tab tab 501 near the outer side of the electrode assembly 100 .
  • the width of the first tab piece 40 refers to the width of the electrode assembly 100 along a direction parallel to the width direction of the first tab 103
  • the width of the second tab piece 40 refers to the width of the electrode assembly along the direction parallel to the width direction of the first tab 103
  • the sum of the thicknesses of the plurality of first sub-tabs 401 is equal to the thickness of the other end of the first sub-tabs 40 , and the deviation can be plus or minus 1 ⁇ m, which can further improve the relationship between the first sub-tabs 401 and the other end of the first sub-tabs 40 .
  • Welding reliability of the first tab 103 The sum of the thicknesses of the plurality of second sub-tab tabs 501 is equal to the thickness of the other end of the second tab tab 50 , and the deviation can be plus or minus 1 ⁇ m, which can further improve the thickness of the second sub tab tabs 501 and the second tab tabs 303 . Welding reliability.
  • the tabs and the current collector are integrally formed, and the width of the tabs gradually decreases from the inside to the outside of the electrode assembly, which improves the temperature difference between the inside and outside of the electrode assembly under high-rate charge and discharge, and reduces energy density loss.
  • FIG. 12 is a flowchart of a method for fabricating an electrode assembly 100 according to an embodiment of the present application.
  • the manufacturing method of the electrode assembly 100 may include the following steps:
  • step S1 a plurality of first recesses 304 are cut out in the second pole piece 30 , and the second pole piece 30 includes a second current collector 301 and a second active material layer 302 disposed on the second current collector 301 .
  • step S2 a plurality of second concave portions 104 are cut out in the first pole piece 10 , and the first pole piece 10 includes a first current collector 101 and a first active material layer 102 disposed on the first current collector 101 .
  • step S3 a plurality of third recesses 201 are cut out in the isolation film 20 .
  • Step S4 removing the second active material layers 302 in the second tab regions on the second pole piece 30 to form a plurality of second tabs 303 .
  • Step S5 removing the first active material layers 102 in the plurality of first tab regions on the first pole piece 10 to form a plurality of first tabs 103 .
  • Step S6 winding the first pole piece 10 , the isolation film 20 and the second pole piece 30 to form an electrode assembly with a winding core structure.
  • Step S7 electrically connecting the first tab piece 40 to each of the first tabs 103 .
  • Step S8 electrically connecting the second tabs 50 to each of the second tabs 303 .
  • the electrochemical device 200 includes the electrode assembly 100 in any of the above-mentioned cases and a casing for accommodating the electrode assembly 100 .
  • the first tab 40 and the second tab 50 can protrude from the housing to form two connection terminals.
  • the electrochemical device 200 may be a lithium ion battery, a lithium polymer battery, or the like.
  • 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, an electric 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 Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

本申请公开了一种电化学装置及电子装置。电化学装置包括电极组件，电极组件包括第一极片、第二极片以及设置在第一极片和第二极片之间的隔离膜。第一极片包括第一集流体及设置于第一集流体上的第一活性材料层，第二极片包括第二集流体及设置于第二集流体上的第二活性材料层。电极组件还包括至少一个第一凹部与多个第一极耳，第一凹部设置于第二极片上。多个第一极耳由第一集流体形成，多个第一极耳相互电连接。在电极组件厚度方向上，两个第一极耳之间设置有第一凹部。本申请的电化学装置，将极耳与集流体设置为一体成型，可改善电化学装置在高倍率充放电下的内外温差，且减少能量密度损失。

Description

电化学装置及电子装置 技术领域
本申请涉及一种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，同时电化学装置内外部由于散热条件不同也会产生较大的温差，热积累和内外部温度的不平衡会对电化学装置的寿命和性能产生影响。现有技术一般是在电化学装置内部设置导热片，通过导热片将内部热量导出。然而，电化学装置内部设置导热片虽可以加快内部散热，但会降低电化学装置的能量密度。
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化学装置，可以改善电极组件在高倍率充放电下的内侧和外侧温差，同时减少能量密度损失。
本申请实施例提出一种电化学装置，包括电极组件。电极组件包括第一极片、第二极片、隔离膜、至少一个第一凹部及多个第一极耳。隔离膜设置在第一极片和第二极片之间。第一极片包括第一集流体及设置于第一集流体上的第一活性材料层。第二极片包括第二集流体及设置于第二集流体上的第二活性材料层。第一凹部设置于第二极片上，多个第一极耳由第一集流体形成，多个第一极耳相互电连接。在电极组件厚度方向上，两个第一极耳之间设置有第一凹部。
在一些实施例中，电极组件还包括至少一个第二凹部及多个第二极耳。第二凹部设置于第一极片上，多个第二极耳由第二集流体形成，多个第二极耳相 互电连接。在电极组件厚度方向上，两个第二极耳之间设置有第二凹部。
在一些实施例中，靠近电极组件的内侧的第一极耳的宽度大于或等于靠近电极组件的外侧的第一极耳的宽度。靠近电极组件的内侧的第一凹部的宽度大于或等于靠近电极组件外侧的第一凹部的宽度。
在一些实施例中，在电极组件厚度方向上对称的第一极耳的宽度相同。
在一些实施例中，在电极组件宽度方向上，第一极耳包括第一侧边及第二侧边。第一侧边或第二侧边中的至少一者与设置有第一活性材料层的第一集流体之间具有间隙。
在一些实施例中，第一极耳未设置第一活性材料层。
在一些实施例中，隔离膜设置有多个第三凹部。在电极组件厚度方向上，第三凹部的投影位于与第三凹部相邻的第一凹部和第一极耳的投影内。
在一些实施例中，电极组件还包括第四凹部，第四凹部设置于第一极片上，第四凹部设置于两个第一极耳之间。
在一些实施例中，电极组件还包括第一极耳片。第一极耳片电连接于第一极耳。其中，第一极耳片的一端包括多个第一子极耳片，每一第一子极耳片电连接于第一极耳。
在一些实施例中，靠近电极组件的内侧的第一子极耳片的宽度大于靠近电极组件的外侧的第一子极耳片的宽度。
在一些实施例中，多个第一子极耳片的厚度之和等于第一极耳片的另一端的厚度。
在一些实施例中，在一些实施例中，多个第一凹部与多个第二凹部设置在电极组件的同一端或不同端。
在一些实施例中，电极组件为卷绕结构或叠片结构。
在一些实施例中，电极组件为卷绕结构，在卷绕方向上，靠近电极组件的卷绕起始端的第一极耳的宽度大于远离电极组件的卷绕起始端的第一极耳的宽度。
在一些实施例中，多个第一极耳焊接或导电胶粘接。
本申请的另外一方面在于提出了一种电子装置，包括上述的电化学装置。
根据本申请实施例的电化学装置，将极耳与集流体设置为一体成型，且多个同极性的极耳和凹部沿电芯厚度方向的投影存在重合区，可改善电化学 装置在高倍率充放电下的内外温差，极耳和极耳焊接区均设置在极片内部，减少电化学装置的能量密度损失。
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示出了根据本申请一实施例的第一极片的结构示意图；
图3示出了根据本申请一实施例的第二极片的结构示意图；
图4示出了根据本申请一实施例的隔离膜的结构示意图；
图5示出了根据本申请一实施例的电极组件在第一视角下的俯视图；
图6示出了根据本申请另一实施例的第一极片的结构示意图；
图7示出了根据本申请另一实施例的第二极片的结构示意图；
图8示出了根据本申请又一实施例的第一极片的结构示意图；
图9示出了根据本申请又一实施例的第二极片的结构示意图；
图10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11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12示出了根据本申请一实施例的电极组件的制作方法的流程图；
图13示出了根据本申请一实施例的电化学装置的模块示意图；
图14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，第一极耳片40，第二极耳片50，电极组件100，第一集流体101，第一活性材料层102，第一极耳103，第二凹部104，第三凹部201，第二集流体301，第二活性材料层302，第二极耳303，第一凹部304，电化学装置200，电子装置300，第一子极耳片401，第二子极耳片501，第一侧边1031，第二侧边1032，第一间隙1033，第三侧边3031，第四侧边3032，第二间隙3033。
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。
下面参考图1-图11具体描述根据本申请实施例的电极组件100。
在一些实施例中，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、隔离膜20、第二极片30。第一极片10包括第一集流体101及设置于第一集流体101上的第一活性材料层102。第二极片30包括第二集流体301及设置于第二集流体301上的第二活性材料层302。电极组件100可以由第一极片10、隔离膜20及第二极片30卷绕形成，也可以由第一极片10、隔离膜20及第二极片30叠片形成。
在一些实施例中，第一活性材料层102可以设置在第一集流体101的两面，或者仅设置在第一集流体101的一面。第二活性材料层302可以设置在第二集流体3011的两面，或者仅设置在第二集流体301的一面。
在一些实施例中，第一极片10为正极极片，第一集流体101为正极集流体，第一活性材料层102为正极活性材料层。第二极片30为负极极片，第二集流体301为负极集流体，第二活性材料层302为负极活性材料层。或者，第一极片10为负极极片，第一集流体101为负极集流体，第一活性材料层102为负极活性材料层。第二极片30为正极极片，第二集流体301为正极集流体，第二活性材料层302为正极活性材料层。
在一些实施例中，如图2所示，多个第一极耳103由第一极片10的第一集流体101形成，即第一极耳103与第一集流体101一体成型，从而使得电极组件100内部热量可以更快导出。第一极片10还可以包括至少一个第二凹部104，第一极耳103和第二凹部104可以交叉设置。
举例而言，可以先在第一集流体101上设置第一活性材料层102形成第一极片10，然后将第一极片10上预先设定的多个极耳区的第一活性材料层102清洗掉，清洗后暴露出的第一集流体101作为多个第一极耳103。也可以先在第一集流体101上间隔贴胶纸，然后在第一集流体101上设置第一活性材料层102形成第一极片10，再移除这些胶纸，进而可在第一极片10形成多个第一极耳103。
在一些实施例中，当完成在第一集流体101上设置第一活性材料层102时，可以将第一极片10上预先设定的至少一个指定区域的第一集流体101和第一活性材料层102裁切掉，进而形成至少一个第二凹部104。
在一些实施例中，多个第一极耳103还可以由第一集流体101的空箔区形成，即无需通过去除第一集流体101上的第一活性材料层102来得到第一极耳103，而直接使用第一集流体101的空箔区。
如图3所示，多个第二极耳303由第二极片30的第二集流体301形成，即第二极耳303与第二集流体301一体成型，从而使得电极组件100内部热量可以更快导出。第二极片30还可以包括至少一个第一凹部304，第二极耳303和第一凹部304可以交叉设置。
举例而言，可以先在第二集流体301上设置第二活性材料层302形成第二极片30，然后将第二极片30上预先设定的多个极耳区的第二活性材料层302清洗掉，清洗后暴露出的第二集流体301作为多个第二极耳303。也可以先在第二集流体301上间隔贴胶纸，然后在第二集流体301上设置第二活性材料层302形成第二极片30，再移除这些胶纸，进而可在第二极片30形成多个第二极耳303。
在一些实施例中，当完成在第二集流体301上设置第二活性材料层302时，可以将第二极片30上预先设定的至少一个指定区域的第二集流体301和第二活性材料层302裁切掉，进而形成至少一个第一凹部304。
在一些实施例中，多个第二极耳303还可以由第二集流体301的空箔区形成，即无需通过去除第二集流体301上的第二活性材料层302来得到第二极耳303，直接使用第二集流体301的空箔区。
在一些实施例中，如图4所示，隔离膜20设置有多个第三凹部201。第三凹部201的宽度W3小于或等于与其相邻的第一凹部304的宽度W1，且小于或等于与其相邻的第二凹部104的宽度W2。第三凹部201的深度H3小于或等于与其相邻的第一凹部304的深度H1，且小于或等于与其相邻的第二凹部104的深度H2，进而可以避免第一极片10与第二极片30之间发生短路。
在一些实施例中，如图5所示，为电极组件100在第一视角下的俯视图，该第一视角的视线方向与第一方向X1垂直。电极组件100由第一极片10、隔离膜20及第二极片30卷绕形成。多个第一凹部304与多个第二凹部104 位于电极组件100的同一端。每一第一凹部304和每一第一极耳103在电极组件100的第一方向X1上的投影存在重合区，进而多个第一极耳103之间可以相互电连接。每一第二凹部104和每一第二极耳303在电极组件100的第一方向X1上的投影亦存在重合区，进而多个第二极耳303之间可以相互电连接。在其他实施例中，多个第一凹部304与多个第二凹部104还可以位于电极组件100的对向端。此时的电极组件100的一端的方向与该第一视角的视线方向平行。
在一些实施例中，第一方向X1可选为电极组件100的厚度方向。
在一些实施例中，可以采用图2所示的第一极片10、图3所示的第二极片30及图4所示的隔离膜20卷绕形成图5所示的电极组件100。
在一些实施例中，还可以采用图6所示的第一极片10、图7所示的第二极片30及图4所示的隔离膜20卷绕形成电极组件100。
在一些实施例中，靠近电极组件100的内侧的第一极耳103的宽度大于或等于靠近电极组件100外侧的第一极耳103的宽度，靠近电极组件100的内侧的第二极耳303的宽度大于或等于靠近电极组件100外侧的第二极耳303的宽度。靠近电极组件100的内侧的第一凹部304的宽度大于或等于靠近电极组件100外侧的第一凹部304的宽度，靠近电极组件100的内侧的第二凹部104的宽度大于或等于靠近电极组件100外侧的第二凹部104的宽度。
在本申请中，电极组件100的内侧是指电极组件100的内层位置，电极组件100的外侧是指电极组件100的外层位置。
在一些实施例中，如图5所示，多个第一极耳103的宽度从电极组件100内侧到外侧呈逐渐减小变化，多个第一凹部304的宽度从电极组件100内侧到外侧呈逐渐减小变化。多个第二极耳303的宽度从电极组件100内侧到外侧呈逐渐减小变化，多个第二凹部104的宽度从电极组件100内侧到外侧呈逐渐减小变化。进而使得电极组件100内侧的极耳区宽度较宽，极耳电流密度小，设置活性材料层的集流体区域相对较少，电极组件100内部产热更少。且较宽的极耳可提高电极组件100内部的导热和散热性能，而电极组件100外部较易散热，极耳区宽度较窄，设置活性材料层的集流体区域相对较多，可以提供更多的能量密度。
在一些实施例中，极耳(第一极耳103、第二极耳303)或凹部(第一凹部 304、第二凹部104)的宽度从电极组件100内侧到外侧呈逐渐减小变化可以是指宽度从电极组件100内侧到外侧依次减小，或者几个相邻层的宽度没有变化，但宽度总体上是从电极组件100内侧到外侧减小。比如，从电极组件100的中心到第一外侧依次为第一正极极耳至第五正极极耳，第一正极极耳至第五正极极耳的宽度依次减小，从电极组件100的中心到第二外侧依次为第六正极极耳至第十正极极耳，第六正极极耳至第十正极极耳的宽度依次减小。再比如，从电极组件100的中心到第一外侧依次为第一正极极耳至第六正极极耳，第一正极极耳宽度大于第二正极极耳，第二正极极耳宽度等于第三正极极耳宽度，第三正极极耳至第六正极极耳的宽度依次减小，从电极组件100的中心到第二外侧依次为第七正极极耳至第十二正极极耳，第七正极极耳宽度大于第八正极极耳，第八正极极耳宽度等于第九正极极耳宽度，第九正极极耳至第十二正极极耳的宽度依次减小。
在一些实施例中，如图5所示，电极组件100两侧对称的第一极耳103的宽度相同，电极组件100两侧对称的第二极耳303的宽度相同。设置电极组件100两侧对称的第一极耳103宽度相同，则可以使得在厚度方向上离电极组件100中心距离相同的第一极耳103的散热能力相同，在提高电极组件100的散热性能的同时，可以降低设置第一极耳103对能量密度的影响。
在一些实施例中，电极组件100两侧对称的第一极耳103的宽度也可以不相同，电极组件100两侧对称的第二极耳303的宽度也可以不相同。
在本申请中，电极组件100两侧对称是指沿电极组件100厚度方向对称。
在一些实施例中，电极组件100为卷绕结构，在电极组件100的卷绕方向上，靠近卷绕结构的卷绕起始端的第一极耳103的宽度大于远离卷绕结构的卷绕起始端的第一极耳103的宽度。即在电极组件100的卷绕方向上，多个第一极耳100的宽度依次递减。则形成卷绕结构后，电极组件100两侧对称的第一极耳103的宽度不同，如此设置，虽然降低了一侧的散热性能，但相应的活性物质层的设置面积增加，提高了能量密度。在另一些实施例中，在电极组件100的卷绕方向上，靠近卷绕结构的卷绕起始端的第二极耳303的宽度大于远离卷绕结构的卷绕起始端的第二极耳303的宽度。
在一些实施例中，假设电极组件100包括N层，N为大于零的整数，第一极耳103的数量可选小于或等于N/2，第二极耳303的数量可选小于或等于N/2。
在一些实施例中，电极组件100还包括第四凹部(未示出)，第四凹部设置于第一极片10上，第四凹部设置于两个第一极耳103之间。即两个第一极耳103之间设置有第一凹部304和第四凹部，即电极组件100中并不是每一层的第一极片10上均设置有第一极耳103。在满足散热要求的条件下，可以减少相互电连接的第一极耳103的个数，提高第一极耳103的电连接可靠性，同时可以降低工艺复杂性，提高生产率。
在一些实施例中，电极组件100还包括第五凹部(未示出)，第五凹部设置于第二极片30上，第五凹部设置于两个第二极耳303之间。即两个第二极耳303之间设置有第二凹部104和第五凹部，即电极组件100中并不是每一层的第二极片30均设置有第二极耳303。在满足散热要求的条件下，可以减少相互电连接的第一极耳103的个数，提高第一极耳103的电连接可靠性，同时可以降低工艺复杂性，提高生产率。
在一些实施例中，多个第一极耳103之间可以通过焊接或者导电胶实现电连接，多个第二极耳303之间同样可以通过焊接或者导电胶实现电连接。
在一些实施例中，沿着第一方向X1，第三凹部201的投影位于与该第三凹部201相邻的第一凹部304和第一极耳103的投影内。
在一些实施例中，沿着第一方向X1，第三凹部201的投影位于与该第三凹部201相邻的第二凹部104和第二极耳303的投影内。如图8所示，沿宽度方向W11，第一极耳103还可以包括第一侧边1031及第二侧边1032，宽度方向W11为第一极片10延伸的方向，且宽度方向W11不是第一极耳103或第二凹部104朝向的方向。第一侧边1031和第二侧边1032与设置有第一活性材料层102的第一集流体101之间均具有一第一间隙1033，使得第一极耳103可以相对自由地活动，可以降低在焊接第一极耳103时对设置有第一活性材料层102的第一集流体101的拉扯力。在其他实施例中，也可以是第一侧边1031与第二侧边1032中的一者与设置有第一活性材料层102的第一集流体101之间具有第一间隙1033。
在本申请中，第一极耳或第一凹部的宽度是指沿宽度方向W11的宽度。
在一些实施例中，如图9所示，沿宽度方向W12，第二极耳303还可以包括第三侧边3031及第四侧边3032，宽度方向W12为第二极片30延伸的方向，且宽度方向W12不是第二极耳303或第一凹部304朝向的方向。第三侧边3031 和第四侧边3032与设置有第二活性材料层302的第二集流体301之间均具有一第二间隙3033，使得第二极耳303可以相对自由地活动，可以降低在焊接第二极耳303时对设置有第二活性材料层302的第二集流体301的拉扯力。在其他实施例中，也可以是第三侧边3031与第四侧边3032中的一者与设置有第二活性材料层302的第二集流体301之间具有第二间隙3033。
在本申请中，第二极耳或第二凹部的宽度是指沿宽度方向W12的宽度。
在一些实施例中，如图10所示，电极组件100还包括第一极耳片40及第二极耳片50。第一极耳片40电连接于多个第一极耳103，第二极耳片50电连接于多个第二极耳303。在图10中，第一凹部304，第二凹部104，第三凹部201均未示出。
在一些实施例中，如图11所示，第一极耳片40的一端分叉成宽度不同的多个第一子极耳片401，每一第一子极耳片401电连接于至少一第一极耳103，第一子极耳片401的数量可以根据实际需求进行设定，比如第一极耳片40的一端分叉成宽度不同的4个第一子极耳片401。较宽的第一子极耳片401可选电连接电极组件100较内侧的第一极耳103，较窄的第一子极耳片401可选电连接电极组件100较外侧的第一极耳103，即靠近电极组件100的内侧的第一子极耳片401的宽度大于靠近电极组件100的外侧的第一子极耳片401的宽度。第二极耳片50的一端分叉成宽度不同的多个第二子极耳片501，每一第二子极耳片501电连接于至少一第二极耳303，第二子极耳片501的数量可以根据实际需求进行设定，比如第二极耳片50的一端分叉成宽度不同的4个第二子极耳片501。较宽的第二子极耳片501可选电连接电极组件100较内侧的第二极耳303，较窄的第二子极耳片501可选电连接电极组件100较外侧的第二极耳303，即靠近电极组件100的内侧的第二子极耳片501的宽度大于靠近电极组件100的外侧的第二子极耳片501的宽度。
在本申请中，第一极耳片40的宽度是指电极组件100中沿与第一极耳103宽度方向平行的方向的宽度，第二极耳片40的宽度是指电极组件中沿与第二极耳303宽度方向平行的方向的宽度。
在一些实施例中，多个第一子极耳片401的厚度之和等于第一极耳片40的另一端的厚度，偏差可以为正负1μm，进而可以提高第一子极耳片401与第一极耳103的焊接可靠性。多个第二子极耳片501的厚度之和等于第二极耳片 50的另一端的厚度，偏差可以为正负1μm，进而可以提高第二子极耳片501与第二极耳303的焊接可靠性。
本申请实施例的电极组件100，极耳与集流体一体成型，极耳宽度从电极组件内侧到外侧大致呈逐渐减小变化，改善了电极组件在高倍率充放电下的内外温差，且减少能量密度损失。
在一些实施例中，请参阅图12，图12为根据本申请一实施方式的电极组件100的制作方法的流程图。电极组件100的制作方法可以包括以下步骤：
步骤S1，在第二极片30中裁切出多个第一凹部304，第二极片30包括第二集流体301及设置于第二集流体301上的第二活性材料层302。
步骤S2，在第一极片10中裁切出多个第二凹部104，第一极片10包括第一集流体101及设置于第一集流体101上的第一活性材料层102。
步骤S3，在隔离膜20中裁切出多个第三凹部201。
步骤S4，将第二极片30上的多个第二极耳区域的第二活性材料层302移除，从而形成多个第二极耳303。
步骤S5，将第一极片10上的多个第一极耳区域的第一活性材料层102移除，从而形成多个第一极耳103。
步骤S6，卷绕第一极片10、隔离膜20及第二极片30，形成卷芯结构的电极组件。
步骤S7，将第一极耳片40电连接至每一第一极耳103。
步骤S8，将第二极耳片50电连接至每一第二极耳303。
此外，如图13所示，本申请还公开了一种电化学装置200，电化学装置200包括上述任一种情况的电极组件100及容纳电极组件100的外壳。第一极耳片40与第二极耳片50可以从外壳中伸出形成两个连接端子。电化学装置200可以是锂离子电池、锂聚合物电池等。
此外，如图14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、电功工具、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 (16)

  1. 一种电化学装置，包括电极组件，所述电极组件包括第一极片、第二极片以及设置在所述第一极片和所述第二极片之间的隔离膜，
    所述第一极片包括第一集流体及设置于所述第一集流体上的第一活性材料层，所述第二极片包括第二集流体及设置于所述第二集流体上的第二活性材料层，
    其特征在于，所述电极组件还包括：
    至少一个第一凹部，设置于所述第二极片上；
    多个第一极耳，由所述第一集流体形成，多个所述第一极耳相互电连接；
    在所述电极组件厚度方向上，两个所述第一极耳之间设置有所述第一凹部。
  2. 如权利要求1所述的电化学装置，其中，所述电极组件还包括：
    至少一个第二凹部，设置于所述第一极片上；
    多个第二极耳，由所述第二集流体形成，多个所述第二极耳相互电连接；
    在所述电极组件厚度方向上，两个所述第二极耳之间设置有所述第二凹部。
  3. 如权利要求1或2所述的电化学装置，其中，
    靠近所述电极组件的内侧的所述第一极耳的宽度大于或等于靠近所述电极组件的外侧的所述第一极耳的宽度，
    靠近所述电极组件的内侧的所述第一凹部的宽度大于或等于靠近所述电极组件的外侧的所述第一凹部的宽度。
  4. 如权利要求3所述的电化学装置，其中，在所述电极组件厚度方向上对称的所述第一极耳的宽度相同。
  5. 如权利要求1或2所述的电化学装置，其中，在所述电极组件宽度方向上，所述第一极耳包括第一侧边及第二侧边，所述第一侧边或所述第二侧边中的至少一者与设置有所述第一活性材料层的所述第一集流体之间具有间隙。
  6. 如权利要求1或2所述的电化学装置，其中，所述第一极耳未设置所述第一活性材料层。
  7. 如权利要求1或2所述的电化学装置，其中，所述隔离膜设置有多个第三凹部，
    在所述电极组件厚度方向上，所述第三凹部的投影位于与所述第三凹部相邻的所述第一凹部和所述第一极耳的投影内。
  8. 如权利要求1或2所述的电化学装置，其中，所述电极组件还包括第四凹部，所述第四凹部设置于所述第一极片上，所述第四凹部设置于两个所述第一极耳之间。
  9. 如权利要求1或2所述的电化学装置，其中，所述电极组件还包括：
    第一极耳片，电连接于所述第一极耳；
    其中，所述第一极耳片的一端包括多个第一子极耳片，每一所述第一子极耳片电连接于所述第一极耳。
  10. 如权利要求9所述的电化学装置，其中，靠近所述电极组件的内侧的所述第一子极耳片的宽度大于靠近所述电极组件的外侧的所述第一子极耳片的宽度。
  11. 如权利要求9所述的电化学装置，其中，多个所述第一子极耳片的厚度之和等于所述第一极耳片的另一端的厚度。
  12. 如权利要求2所述的电化学装置，其中，多个所述第一凹部与多个所述第二凹部设置在所述电极组件的同一端或不同端。
  13. 如权利要求1或2所述的电化学装置，其中，所述电极组件为卷绕结构或叠片结构。
  14. 如权利要求13所述的电化学装置，其中，所述电极组件为卷绕结构，在卷绕方向上，靠近所述电极组件的卷绕起始端的所述第一极耳的宽度大于远离所述电极组件的卷绕起始端的所述第一极耳的宽度。
  15. 如权利要求1或2所述的电化学装置，其中，多个所述第一极耳焊接或导电胶粘接。
  16. 一种电子装置，其特征在于，包括如权利要求1至15任意一项所述的电化学装置。
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