WO2022052120A1 - Dispositif électrochimique et dispositif électronique - Google Patents

Dispositif électrochimique et dispositif électronique 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)
Chinese (zh)
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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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/fr
Priority to CN202080010849.0A priority patent/CN113366682B/zh
Publication of WO2022052120A1 publication Critical patent/WO2022052120A1/fr

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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)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne un dispositif électrochimique et un dispositif électronique. Le dispositif électrochimique comprend un ensemble d'électrodes, l'ensemble d'électrodes comprenant une première pièce polaire, une seconde pièce polaire et une membrane isolante disposée entre la première pièce polaire et la seconde pièce polaire. La première pièce polaire comprend un premier collecteur de courant et une première couche de matériau actif disposée sur le premier collecteur de courant, et la seconde pièce polaire comprend un second collecteur de courant et une seconde couche de matériau actif disposée sur le second collecteur de courant. L'ensemble d'électrodes comprend en outre au moins une première partie concave et une pluralité de premières pattes, l'au moins une première partie concave étant agencée sur la seconde pièce polaire. La pluralité de premières pattes sont formées au moyen du premier collecteur de courant, et la pluralité de premières pattes sont électriquement connectées l'une à l'autre. Une première partie concave est disposée entre deux premières pattes dans une direction d'épaisseur de l'ensemble d'électrodes. Le dispositif électrochimique selon la présente invention permet de former d'un seul tenant les pattes et les collecteurs de courant, de telle sorte que la différence de température entre l'intérieur et l'extérieur du dispositif électrochimique sous charge et décharge à haut débit peut être améliorée, et la perte de densité d'énergie est réduite.
PCT/CN2020/115133 2020-09-14 2020-09-14 Dispositif électrochimique et dispositif électronique WO2022052120A1 (fr)

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