WO2022205183A1 - 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
WO2022205183A1
WO2022205183A1 PCT/CN2021/084689 CN2021084689W WO2022205183A1 WO 2022205183 A1 WO2022205183 A1 WO 2022205183A1 CN 2021084689 W CN2021084689 W CN 2021084689W WO 2022205183 A1 WO2022205183 A1 WO 2022205183A1
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WIPO (PCT)
Prior art keywords
electrochemical device
conductive member
conductive
pole piece
layer
Prior art date
Application number
PCT/CN2021/084689
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English (en)
French (fr)
Inventor
方德煜
Original Assignee
宁德新能源科技有限公司
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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 CN202180002909.9A priority Critical patent/CN113728509A/zh
Priority to PCT/CN2021/084689 priority patent/WO2022205183A1/zh
Priority to EP21933847.2A priority patent/EP4207478A1/en
Publication of WO2022205183A1 publication Critical patent/WO2022205183A1/zh
Priority to US18/192,238 priority patent/US20230238666A1/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
    • 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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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 the field of battery technology, and in particular, to an electrochemical device and an electronic device.
  • the current collectors used in consumer electrochemical devices are continuously thinning, and the coating weight per unit area is increasing.
  • the fluid breaks in the uneven force position such as the bending section or the junction of single and double sides.
  • the fracture of the current collector may reduce the battery capacity and reduce the consumer experience; on the other hand, the current collector at the fracture may have burrs, and there is a potential risk of short circuit.
  • Embodiments of the present application provide an electrochemical device, including an electrode assembly, and the electrode assembly is a wound structure.
  • the electrode assembly is provided with a first bending section, including a first pole piece, a second pole piece and a conductive member.
  • the first pole piece includes a first current collector and a first active material layer disposed on the first current collector, and along the winding direction, the first current collector includes a first part and a second part connected in sequence. Both sides of the first part are provided with a first active material layer, an inner surface of the second part is provided with a first active material layer, and the second part includes a bending part located at the outermost layer of the first bending section.
  • the conductive member connects the first active material layer provided on the outer surface of the first part and the outer surface of the second part, and/or is provided on the outer surface of the bent part.
  • the above-mentioned electrochemical device connects the outer surfaces of the first part and the second part and/or covers the outer surface of the bent part of the second part through a conductive member, and covers the area where the current collector is prone to breakage.
  • the conductive member can electrically connect the pole pieces where the current collector is broken, thereby reducing the capacity loss of the electrochemical device due to the breaking of the current collector or the risk of short circuit caused by the breaking of the current collector. lower.
  • the electrode assembly further includes a first adhesive member, and the first adhesive member adheres the conductive member and the first pole piece.
  • the first adhesive member can stably connect the conductive member to the first pole piece.
  • the conductive member includes a metal sheet or conductive tape.
  • the conductive tape includes a laminated substrate layer and a conductive layer.
  • the conductive layer includes conductive particles and a binding material.
  • the conductive tape further includes an adhesive layer, and the adhesive layer is disposed between the substrate layer and the conductive layer; or, the adhesive layer is disposed on the surface of the substrate layer, and the conductive layer is disposed on the substrate The surface on the same side of the layer as the adhesive layer.
  • the second portion includes a connecting portion connected to the first portion, and the conductive member connects an outer surface of the connecting portion.
  • the outer surface of the second portion exposes the first current collector.
  • the first pole piece is a negative pole piece, and a first active material layer is provided on the outer surface of the bent portion.
  • the second portion is the tail portion of the electrode assembly.
  • the conductive member includes a first conductive member and a second conductive member, the first conductive member connects the first active material layer disposed on the outer surface of the first part and the outer surface of the second part, and the first conductive member is connected to the outer surface of the second part.
  • the two conductive parts are arranged on the outer surface of the bent portion.
  • the first conductive member is connected to the second conductive member.
  • the electrode assembly is further provided with a first section, a second bending section and a second section, and along the winding direction, the first bending section, the first section, the second bending section and the first bending section The two sections are connected in sequence, and the connecting part is located in the first section.
  • the electrode assembly further includes a metal portion, and along the winding direction, the second portion further includes a tail portion, and the metal portion is connected to the tail portion.
  • the first current collector is exposed on both sides of the tail.
  • the electrode assembly further includes a second pole piece and an isolation film disposed between the first pole piece and the second pole piece, and the first pole piece, the second pole piece and the isolation film are stacked and rolled in sequence around.
  • the substrate layer comprises a cellulose derivative, polyvinyl chloride, polyolefin, polystyrene, polyester, polyimide, polyamide, polycarbonate or polyphenylene sulfide at least one.
  • the adhesive material includes at least one of rubber-based resin, acrylic resin, or silicone-based resin;
  • the conductive particles include at least one of metal particles, conductive polymers, or carbon materials;
  • conductive The macromolecule includes at least one of polythiophene, polyaniline, polypyrrole or polyacetylene;
  • the carbon material includes at least one of carbon black, acetylene black, Ketjen black, graphite, graphene, carbon nanotube or carbon nanorod .
  • Embodiments of the present application further provide an electronic device, including the above electrochemical device. Electrochemical devices can provide electrical power to electronic devices.
  • FIG. 1 is a cross-sectional view of an electrode assembly in one embodiment of the present application.
  • FIG. 2 is an enlarged view of a connecting portion location area in an embodiment of the present application.
  • Figure 3 is another view of the connector location area in one embodiment of the present application.
  • FIG. 4 is an enlarged view of a connecting portion location area in another embodiment of the present application.
  • FIG. 5 is a plan view of a first conductive member in another embodiment of the present application.
  • FIG. 6 is a plan view of a first conductive member in another embodiment of the present application.
  • FIG. 7 is a cross-sectional view of a first conductive member in another embodiment of the present application.
  • FIG. 8 is an enlarged view of a connecting portion location area in another embodiment of the present application.
  • FIG. 9 is an enlarged view of a connecting portion location area in another embodiment of the present application.
  • FIG. 10 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • FIG. 11 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • FIG. 12 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • FIG. 13 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • FIG. 14 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • 15 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • 16 is a cross-sectional view of an electrode assembly in another embodiment of the present application.
  • the first bending section 1 The first bending section 1
  • the first collector 51 The first collector 51
  • the first active material layer 52 is the first active material layer 52
  • Embodiments of the present application provide an electrochemical device and an electronic device, and the electronic device includes the electrochemical device.
  • the electrochemical device includes an electrode assembly, and the electrode assembly is a wound structure.
  • the electrode assembly includes a first pole piece, a second pole piece and a conductive member.
  • the electrode assembly is provided with a first bending section.
  • the first pole piece includes a first current collector and a first active material layer arranged on the first current collector.
  • the first current collector includes a first part and a second part that are connected in sequence, and two sides of the first part are A first active material layer is provided, the inner surface of the second portion is provided with a first active material layer, and the second portion includes a bending portion located at the outermost layer of the first bending section.
  • the conductive member connects the first active material layer provided on the outer surface of the first part and the outer surface of the second part, and/or is provided on the outer surface of the bent part.
  • the above-mentioned electrochemical device connects the outer surfaces of the first part and the second part and/or covers the outer surface of the bent part of the second part through the conductive member, and uses the conductive member to coat the area where the current collector is prone to breakage, After the current collector is broken, the conductive member can electrically connect the pole pieces where the current collector is broken, so as to reduce the capacity loss of the electrochemical device or the risk of short circuit caused by the current collector breaking due to the current collector breaking; meanwhile, the conductive member has a simple structure Reliable and low cost.
  • An electrochemical device can provide electrical power to the electronic device.
  • the present disclosure provides an electrochemical device for providing electrical energy to an electronic device.
  • the electrochemical device includes an electrode assembly.
  • the electrode assembly 100 includes a first pole piece 5 , a second pole piece 6 and an isolation film 7 .
  • the isolation film 7 is disposed between the first pole piece 5 and the second pole piece 6 , and the first pole piece 5.
  • the second pole piece 6 and the isolation film 7 are stacked in sequence and wound along the winding direction X to form a winding structure.
  • the first pole piece 5 includes a first current collector 51 and a first active material layer 52 provided on the first current collector 51 .
  • the second pole piece 6 includes a second current collector 61 and a second active material layer 62 provided on the second current collector 61 .
  • the first pole piece 5 may be a cathode pole piece, and the first current collector 51 may be made of a metal material such as aluminum foil.
  • the second pole piece 6 can be an anode pole piece, and the second current collector 61 can be made of copper foil material.
  • the first pole piece 5 may be an anode pole piece, and the second pole piece 6 may be a cathode pole piece.
  • the first current collector 51 includes a first part 511 and a second part 512 .
  • the first portion 511 and the second portion 512 are sequentially connected along the winding direction X.
  • two sides of the first part 511 respectively include a first outer surface 5111 and a first inner surface 5112 , and both the first outer surface 5111 and the first inner surface 5112 are provided with a first outer surface 5111 and a first inner surface 5112 .
  • An active material layer 52, the first outer surface 5111 is located on the side of the first portion 511 away from the winding center.
  • the thickness direction Y of the first pole piece 5 is consistent with the thickness direction of the electrode assembly 100 .
  • the first outer surface 5111 of the first portion 511 exposes the first current collector 51 .
  • two sides of the second portion 512 respectively include a second outer surface 5124 and a second inner surface 5125 , the second inner surface 5125 is provided with the first active material layer 52 , the second The outer surface 5124 is located on the side of the second portion 512 away from the winding center.
  • the second outer surface 5124 on the second portion 512 exposes the first current collector 51 .
  • the second outer surface 5124 of the second portion 512 may be partially provided with the first active material layer 52 . In some embodiments, the second outer surface 5124 of the second part 512 may not be provided with the first active material layer 52 .
  • the first inner surface 5112 of the first portion 511 and the second inner surface 5125 of the second portion 512 are sequentially connected along the winding direction X.
  • the first outer surface 5111 of the first part 511 and the second outer surface 5124 of the second part 512 are sequentially connected along the winding direction X.
  • the winding center refers to the center of the innermost layer where the electrode assembly 100 starts to be wound.
  • the electrode assembly 100 is wound from the separator 7 , and the winding center is the winding center 200 of the separator 7 .
  • the inner surface refers to the position toward the center of winding
  • the outer surface refers to the position away from the center of winding
  • a connecting portion 5121 is provided on the second portion 512 at a position where the first portion 511 is connected. It can be understood that the first part 511 and the second part 512 are connected in sequence along the winding direction X, and the connecting part 5121 may be a part of the second part 512 that is connected to the first part 511 .
  • the first outer surface 5111 of the second portion 512 is not provided with the first active material layer 52 , or is provided with the first active material layer 52 , but the second portion 512 is two sides along the thickness direction of the first pole piece 5 .
  • the thickness of the first active material layer 52 on the side is smaller than the thickness of the first active material layer 52 on both sides of the first part 511 , which may cause stress concentration in the location area of the connecting part 5121 when it is stressed, which is easy to cause The first current collector 51 in this area is broken, and then the capacity of the electrochemical device is lost, or burrs are generated, and there is a risk of short circuit.
  • the electrode assembly 100 further includes a first conductive member 81 that connects the first outer surface 5111 of the first portion 511 and the second portion 512 of the second outer surface 5124.
  • the first conductive member 81 can continue to connect the first part 511 and the second part 512 , so that the first part 511 and the second part 512 can continue to be electrically connected.
  • the first conductive member 81 is connected to the outer surface of the connection portion 5121 .
  • the first conductive member 81 may be a conductive tape.
  • the first conductive member 81 may be a metal or alloy foil such as aluminum foil, silver foil, and gold foil.
  • the conductive tape may include a laminated substrate layer 811 and a conductive layer 812 .
  • the conductive layer 812 may include conductive particles, the conductive layer 812 is connected to the first active material layer 52 provided on the first outer surface 5111 and the second outer surface 5124 , and the conductive particles can The current collector 51 and the first current collector 51 exposed on the second outer surface 5124 are electrically connected.
  • the conductive layer 812 further includes an adhesive material.
  • the conductive tape further includes an adhesive layer 813 .
  • the adhesive layer 813 may be provided on the surface of the base material layer 811 on the same side as the conductive layer 812 .
  • the adhesive layer 813 and the conductive layer 812 may be staggered along a direction perpendicular to the winding direction X.
  • the adhesive layer 813 may also be disposed at the edge of the base material layer 811 , and the conductive layer 812 may be disposed at the middle position of the surface of the base material layer 811 extending along the winding direction X.
  • the adhesive layer 813 may also be disposed on the side of the base material layer 811 away from the conductive layer 812 . Viewed along the thickness direction of the conductive tape, a part of the adhesive layer 813 is adhered to the base material layer 811, and another part of the adhesive layer 813 is located outside the base material layer 811, and is used to bond the first pole piece 5 to make the conductive The layer 812 may be bonded to the first pole piece 5 . In some embodiments, the thickness direction Y of the first pole piece 5 is consistent with the thickness direction of the conductive tape.
  • the substrate layer includes at least one of cellulose derivatives, polyvinyl chloride, polyolefin, polystyrene, polyester, polyimide, polyamide, polycarbonate, or polyphenylene sulfide .
  • the adhesive material includes at least one of rubber-based resin, acrylic-based resin, or silicone-based resin.
  • the conductive particles include at least one of metal particles, conductive polymers, or carbon materials.
  • the conductive polymer includes at least one of polythiophene, polyaniline, polypyrrole, or polyacetylene.
  • the carbon material includes at least one of carbon black, acetylene black, ketjen black, graphite, graphene, carbon nanotubes, or carbon nanorods.
  • the adhesive layer 813 may also be disposed between the base material layer 811 and the conductive layer 812 .
  • the first conductive member 81 may be a metal sheet.
  • the electrode assembly 100 further includes a first adhesive member 84 .
  • the adhesive member 84 bonds the first conductive member 81 and the first pole piece 5 .
  • the first adhesive member 84 may be disposed on a side of the first conductive member 81 away from the first pole piece 5 . At this time, when viewed along the thickness direction of the first conductive member 81 , a part of the first adhesive member 84 is adhered to the first conductive member 81 , and another part of the first adhesive member 84 is adhered to the first pole piece 5 . In some embodiments, the thickness direction Y of the first pole piece 5 is consistent with the thickness direction of the first conductive member 81 .
  • the first pole piece 5 when the electrode assembly 100 expands, the first pole piece 5 is subjected to tension, which may cause the first current collector 51 in the region of the connecting portion 5121 where stress concentration is likely to break.
  • the first conductive member 81 can reconnect the first current collector 51 on both sides of the crack, and avoid short circuit caused by burrs generated by the break.
  • the electrode assembly 100 is of a wound structure, so that the electrode assembly 100 includes a first bending section 1 , a first section 2 , a second bending section 3 and a second section 4 which are connected in sequence.
  • the connecting portion 5121 is located on the first segment 2 .
  • the second portion 512 includes a first bending portion 5122 located on the first bending segment 1 and a second bending portion 5123 located on the second bending segment 3 .
  • the first current collector 51 on the first bending portion 5122 and/or the second bending portion 5123 is subjected to tension, and is prone to breakage when subjected to force. If the first current collector 51 on the first bent portion 5122 and/or the second bent portion 5123 is broken, the capacity of the electrochemical device will be lost, or burrs will be generated, and there is a risk of short circuit.
  • the electrode assembly 100 further includes a second conductive member 82 and a third conductive member 83,
  • the second conductive member 82 covers the outer surface of the first bending portion 5122
  • the third conductive member 83 covers the outer surface of the second bending portion 5123 .
  • the materials and compositions of the second conductive member 82 and the third conductive member 83 may be the same as those of the first conductive member 81 , which will not be repeated here.
  • the electrode assembly 100 further includes a second bonding member 85 and a third bonding member 86 , and the second bonding member 85 is bonded The second conductive member 82 and the first pole piece 5 are bonded together, and the third adhesive member 86 is bonded to the third conductive member 83 and the first pole piece 5 .
  • the materials and compositions of the second adhesive member 85 and the third adhesive member 86 may be the same as those of the first adhesive member 84, which will not be repeated here.
  • the second conductive member 82 can be completely covered on the outer surface of the first bent portion 5122, that is, along the roll Around the direction X, the second conductive member 82 covers the first bent portion 5122 , and two ends are connected to the first segment 2 and the second segment 4 .
  • the second conductive member 82 can cover only the region of the first bending portion 5122 where the first current collector 51 is prone to breakage, for example, the first bending section 1 and the The first bent portion 5122 at the connecting inflection point of the first segment 2 and/or the second segment 4 , or the first bent portion 5122 on the first bent segment 1 .
  • the third conductive member 83 can be completely covered on the outer surface of the second bent portion 5123, that is, along the roll Around the direction X, the third conductive member 83 covers the second bent portion 5123 , and two ends are connected to the first segment 2 and the second segment 4 .
  • the end of the third conductive member 83 connected to the first segment 2 is connected to the first active layer provided on the first outer surface 5111, the first conductive member 81 can be omitted, and the third conductive member 83 can be connected
  • the outer surface of the part 5121 can save cost.
  • the third conductive member 83 can cover only the region of the second bending portion 5123 where the first current collector 51 is prone to breakage, such as the second bending section 3 and the first current collector 51 .
  • any two of the first conductive member 81 , the second conductive member 82 and the third conductive member 83 may be connected to each other.
  • the first conductive member 81 , the second conductive member 82 and the third conductive member 83 may be connected together.
  • the electrode assembly 100 further includes a first metal part 91 and a second metal part 92 .
  • the first pole piece 5 includes a first start part 53 and a first end part 54, the first start part 53 is close to the winding start end of the first pole piece 5, and the first end part 54 is close to the winding of the first pole piece 5. around the end and on the second portion 512 .
  • the second pole piece 6 includes a second starting part 63 and a second ending part 64 , the second starting part 63 is close to the winding starting end of the second pole piece 6 , and the second ending part 64 is close to the second pole piece 6 the end of the winding.
  • the first metal portion 91 and the second metal portion 92 may be electrically connected to the first starting portion 53 and the second starting portion 63, respectively, or may be electrically connected to the first end portion 54 and the second end portion 64, respectively, so that the electrochemical The device can transmit electrical energy to power external devices.
  • the electrochemical device connects the outer surfaces of the first part 511 and the second part 512 and/or covers the outer surface of the bent part of the second part 512 through the conductive member, so that the conductive member will be prone to current collector breakage After the current collector is broken, the conductive member can electrically connect the pole pieces where the current collector breaks, reducing the capacity loss of the electrochemical device due to the breaking of the current collector or the risk of short circuit caused by the breaking of the current collector; the The structure of the conductive part is simple and reliable, and the cost is low.

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Abstract

本公开提供一种电化学装置及电子装置，该电化学装置包括电极组件。电极组件为卷绕结构并设有第一弯折段，电极组件包括第一极片、第二极片和导电件。第一极片包括第一集流体和第一活性物质层，沿卷绕方向，第一集流体包括依次连接的第一部和第二部。第一部的两面设有第一活性物质层，第二部的内表面设有第一活性物质层，第二部包括位于第一弯折段最外层的弯折部。导电件连接第一部和第二部的外表面，和/或包覆在弯折部的外表面上。设置导电件可以降低因集流体断裂而使该电化学装置的容量损失或集流体断裂后造成短路的风险，同时导电件结构简单可靠，成本较低。

Description

电化学装置及电子装置 技术领域
本申请涉及电池技术领域，特别涉及一种电化学装置及电子装置。
背景技术
为了追求更高的体积能量密度，消费类电化学装置所用的集流体(铜箔、铝箔)不断减薄、单位面积涂布重量不断提高，充放电过程的反复膨胀最终导致卷绕结构电池的集流体在弯折段或单双面交界等受力不均位置发生断裂。集流体断裂一方面可能造成电池容量降低，导致消费者体验度降低；另一方面断裂处的集流体可能存在毛刺，存在潜在的短路风险。
发明内容
鉴于上述状况，有必要提供一种电化学装置及电子装置，改善集流体断裂的问题。
本申请的实施例提供一种电化学装置，包括电极组件，电极组件为卷绕结构。电极组件设置有第一弯折段，包括第一极片、第二极片和导电件。第一极片包括第一集流体和设置在第一集流体上的第一活性物质层，沿卷绕方向，第一集流体包括依次连接的第一部和第二部。第一部的两面设置有第一活性物质层，第二部的内表面设置有第一活性物质层，第二部包括位于第一弯折段最外层的弯折部。导电件连接第一部的外表面上设置的第一活性物质层和第二部的外表面，和/或设置在弯折部的外表面上。
上述的电化学装置通过导电件将第一部和第二部的外表面连接和/或将第二部的弯折部外表面包覆，将易发生集流体断裂的区域包覆，在集流体断裂后，导电件可以将集流体断裂处的极片电连接，降低因集流体断裂而使该电化学装置的容量损失或集流体断裂后造成短路的风险，此外该导电件结构简单可靠，成本较低。
在本申请的一些实施例中，电极组件还包括第一粘接件，第一粘接件粘接导电件和第一极片。第一粘接件可将导电件稳定的连接于第一极片。
在本申请的一些实施例中，导电件包括金属片或导电胶带。在本申请的一些实施例中，导电胶带包括层叠的基材层和导电层。在本申请的一些实施例中，导电层包括导电颗粒和粘接材料。
在本申请的一些实施例中，导电胶带还包括粘接层，粘接层设置在基材层和导电层之间；或，粘接层设置在基材层的表面，导电层设置在基材层上与所述粘接层同侧的表面。
在本申请的一些实施例中，第二部包括与第一部连接的连接部，导电件 连接连接部的外表面。
在本申请的一些实施例中，第二部的外表面显露出第一集流体。在本申请的一些实施例中，第一极片为负极极片，弯折部的外表面设置有第一活性物质层。
在本申请的一些实施例中，沿卷绕方向，第二部为电极组件的尾部。在本申请的一些实施例中，导电件包括第一导电件和第二导电件，第一导电件连接第一部的外表面上设置的第一活性物质层和第二部的外表面，第二导电件设置在弯折部的外表面上。
在本申请的一些实施例中，第一导电件与第二导电件相连接。在本申请的一些实施例中，电极组件还设置有第一段、第二弯折段和第二段，沿卷绕方向，第一弯折段、第一段、第二弯折段和第二段依次连接，连接部位于第一段。
在本申请的一些实施例中，电极组件还包括金属部，沿卷绕方向，第二部还包括尾部，金属部与尾部连接。在本申请的一些实施例中，尾部的两面显露出第一集流体。
在本申请的一些实施例中，电极组件还包括第二极片和设置于第一极片和第二极片之间的隔离膜，第一极片、第二极片和隔离膜依次层叠卷绕。
在本申请的一些实施例中，基材层包括纤维素衍生物、聚氯乙烯、聚烯烃、聚苯乙烯、聚酯、聚酰亚胺、聚酰胺、聚碳酸酯或聚苯硫醚中的至少一种。在本申请的一些实施例中，粘接材料包括橡胶系树脂、丙烯酸系树脂或硅酮系树脂中的至少一种；导电颗粒包括金属颗粒、导电高分子或碳材料中的至少一种；导电高分子包括聚噻吩、聚苯胺、聚吡咯或聚乙炔中的至少一种；碳材料包括炭黑、乙炔黑、科琴黑、石墨、石墨烯、碳纳米管或碳纳米棒中的至少一种。
本申请的实施例还提供一种电子装置，包括上述的电化学装置。电化学装置可为电子装置提供电能。
附图说明
图1是本申请的一个实施例中的电极组件的剖视图。
图2是本申请的一个实施例中的连接部位置区域的放大图。
图3是本申请的一个实施例中的连接部位置区域的另一视图。
图4是本申请的另一个实施例中的连接部位置区域的放大图。
图5是本申请的另一个实施例中的第一导电件的平面视图。
图6是本申请的另一个实施例中的第一导电件的平面视图。
图7是本申请的另一个实施例中的第一导电件的剖视图。
图8是本申请的另一个实施例中的连接部位置区域的放大图。
图9是本申请的另一个实施例中的连接部位置区域的放大图。
图10是本申请的另一个实施例中的电极组件的剖视图。
图11是本申请的另一个实施例中的电极组件的剖视图。
图12是本申请的另一个实施例中的电极组件的剖视图。
图13是本申请的另一个实施例中的电极组件的剖视图。
图14是本申请的另一个实施例中的电极组件的剖视图。
图15是本申请的另一个实施例中的电极组件的剖视图。
图16是本申请的另一个实施例中的电极组件的剖视图。
主要元件符号说明
电极组件                            100
第一弯折段                          1
第一段                              2
第二弯折段                          3
第二段                              4
第一极片                            5
第一集流体                          51
第一部                              511
第一外表面                          5111
第一内表面                          5112
第二部                              512
连接部                              5121
第一弯折部                          5122
第二弯折部                          5123
第二外表面                          5124
第二内表面                          5125
第一活性物质层                      52
第一起始部                          53
第一末尾部                          54
第二极片                            6
第二集流体                          61
第二活性物质层                      62
第二起始部                          63
第二末尾部                          64
隔离膜                              7
第一导电件                          81
基材层                              811
导电层                              812
粘接层                              813
第二导电件                          82
第三导电件                          83
第一粘接件                          84
第二粘接件                          85
第三粘接件                          86
第一金属部                          91
第二金属部                          92
卷绕中心                            200
卷绕方向                            X
厚度方向                            Y
如下具体实施方式将结合上述附图进一步说明本申请。
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。
需要说明的是，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设置的元件。当一个元件被认为是“设置在”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设置的元件。
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例的目的，不是旨在于限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
本申请的实施例提供一种电化学装置及电子装置，电子装置包括该电化学装置。电化学装置包括电极组件，电极组件为卷绕结构。电极组件包括第一极片、第二极片和导电件。电极组件设置有第一弯折段。第一极片包括第一集流体和设置在第一集流体上的第一活性物质层，沿卷绕方向，第一集流体包括依次连接的第一部和第二部，第一部的两面设置有第一活性物质层，第二部的内表面设置有第一活性物质层，第二部包括位于第一弯折段最外层的弯折部。导电件连接第一部的外表面上设置的第一活性物质层和第二部的外表面，和/或设置在弯折部的外表面上。上述的电化学装置通过导电件将第一部和第二部的外表面连接和/或将第二部的弯折部外表面包覆，利用导电件将易发生集流体断裂的区域包覆，在集流体断裂后，导电件可以将集流体断裂处的极片电连接，降低因集流体断裂而使该电化学装置的容量损失或集流体断裂后造成短路的风险；同时该导电件结构简单可靠，成本较低。
电化学装置可为该电子装置提供电能。
下面结合附图，对本申请的实施例作进一步的说明。
本公开提供一种电化学装置，用于为电子装置提供电能。该电化学装置包括电极组件。
如图1所示，电极组件100包括第一极片5、第二极片6和隔离膜7，隔离膜7设置于第一极片5和第二极片6之间，并且第一极片5、第二极片6和隔离膜7依次层叠沿卷绕方向X卷绕形成卷绕结构。
第一极片5包括第一集流体51和设置在第一集流体51上的第一活性物质层52。第二极片6包括第二集流体61和设置在第二集流体61上的第二活性物质层62。
在一些实施例中，第一极片5可以为阴极极片，第一集流体51可以采用铝箔等金属材料制成。第二极片6可以为阳极极片，第二集流体61可以采用铜箔材料制成。在一些实施例中，第一极片5可以为阳极极片，第二极片6可以为阴极极片。
如图1、图2和图3所示，第一集流体51包括第一部511和第二部512。在卷绕状态下，第一部511和第二部512沿卷绕方向X依次连接。
在沿第一极片5的厚度方向Y上，第一部511的两侧分别包括第一外表面5111和第一内表面5112，第一外表面5111和第一内表面5112上均设置有第一活性物质层52，第一外表面5111位于第一部511的背离卷绕中心的一侧。在一些实施例中，第一极片5的厚度方向Y与电极组件100的厚度方向一致。
在一些实施例中，第一部511的第一外表面5111显露出第一集流体51。
在沿第一极片5的厚度方向上，第二部512的两侧分别包括第二外表面5124和第二内表面5125，第二内表面5125上设置有第一活性物质层52，第二外表面5124位于第二部512的背离卷绕中心的一侧。
在一些实施例中，第二部512上的第二外表面5124显露出第一集流体51。
在一些实施例中，第二部512的第二外表面5124可以部分设置有第一活性物质层52。在一些实施例中，第二部512的第二外表面5124可以不设置第一活性物质层52。
在一些实施例中，第一部511的第一内表面5112与第二部512的第二内表面5125沿卷绕方向X依次连接。
在一些实施例中，第一部511的第一外表面5111与第二部512的第二外表面5124沿卷绕方向X依次连接。
在本申请中，卷绕中心是指电极组件100开始卷绕的最内层的中心。在一些实施例中，电极组件100从隔离膜7开始卷绕，卷绕中心为隔离膜7的卷绕中心200。
在本申请中，内表面是指朝向卷绕中心的位置，外表面是指背离卷绕中心的位置。
在第二部512上连接第一部511的位置设有连接部5121。可以理解的是，第一部511和第二部512沿卷绕方向X依次连接，连接部5121可以为第二部512中与第一部511相接的一部分。
在一些实施例中，第二部512的第一外表面5111未设置第一活性物质层52，或设有第一活性物质层52，但第二部512沿第一极片5的厚度方向两侧的第一活性物质层52的厚度小于第一部511两侧的第一活性物质层52的厚度，将有可能导致连接部5121的位置区域在受力时易发生应力集中现象，很容易导致该区域的第一集流体51发生断裂，继而使得电化学装置的容量发生损失，或产生毛刺，存在短路的风险。
因此，为了避免第一集流体51断裂或断裂后出现短路的问题，电极组件100还包括第一导电件81，第一导电件81连接第一部511的第一外表面5111和第二部512的第二外表面5124。在第一部511和第二部512发生断裂时，第一导电件81可以继续连接第一部511和第二部512，使第一部511和第二部512可以继续保持电连接。
在一些实施例中，第一导电件81连接连接部5121的外表面。
在一些实施例中，第一导电件81可以为导电胶带。
在一些实施例中，第一导电件81可以为铝箔、银箔、金箔等金属或合金箔片。
在一些实施例中，如图4所示，当第一导电件81为导电胶带时，导电胶带可以包括层叠的基材层811和导电层812。
在一些实施例中，导电层812可以包括导电颗粒，导电层812连接第一外表面5111上设置的第一活性物质层52和第二外表面5124，导电颗粒能够将第一部511的第一集流体51和第二外表面5124上显露出的第一集流体51电连接。
为了使导电层812可以稳定的连接第一极片5，在一些实施例中，导电层还包括粘接材料。
在一些实施例中，导电胶带还包括粘接层813。
如图5和图6所示，粘接层813可以设置在基材层811的与导电层812同侧的表面。
在一些实施例中，粘接层813和导电层812可以沿垂直于卷绕方向X的方向交错设置。
在一些实施例中，也可以是粘接层813设置于基材层811的边缘、导电层812沿卷绕方向X延伸的设于基材层811表面的中间位置。
在一些实施例中，如图7所示，粘接层813还可以设置在基材层811的与导电层812相背离的一侧。沿导电胶带的厚度方向观察，粘接层813的一部分粘接于基材层811，粘接层813的另一部分位于基材层811之外，用于粘接第一极片5，以使导电层812可以粘接于第一极片5。在一些实施例中，第一极片5的厚度方向Y与导电胶带的厚度方向一致。
在一些实施例中，基材层包括纤维素衍生物、聚氯乙烯、聚烯烃、聚苯乙烯、聚酯、聚酰亚胺、聚酰胺、聚碳酸酯或聚苯硫醚中的至少一种。
在一些实施例中，粘接材料包括橡胶系树脂、丙烯酸系树脂或硅酮系树脂中的至少一种。在一些实施例中，导电颗粒包括金属颗粒、导电高分子或碳材料中的至少一种。
在一些实施例中，导电高分子包括聚噻吩、聚苯胺、聚吡咯或聚乙炔中的至少一种。
在一些实施例中，碳材料包括炭黑、乙炔黑、科琴黑、石墨、石墨烯、碳纳米管或碳纳米棒中的至少一种。
如图8所示，在一些实施例中，粘接层813还可以设置在基材层811和导电层812之间。
如图9所示，在一些实施例中，第一导电件81可以为金属片，为了保证金属片连接第一极片5的可靠性，电极组件100还包括第一粘接件84，第一粘接件84粘接第一导电件81和第一极片5。
在一些实施例中，第一粘接件84可以设置于第一导电件81的背离第一极片5的一侧。此时，沿第一导电件81的厚度方向观察，第一粘接件84的一部分粘接于第一导电件81，第一粘接件84的另一部分粘接于第一极片5。在一些实施例中，第一极片5的厚度方向Y与第一导电件81的厚度方向一致。
如图1和图10所示，当电极组件100发生膨胀时，第一极片5受到张力作用，有可能导致易发生应力集中的连接部5121区域的第一集流体51发生断裂，当该区域的第一集流体51断裂时，第一导电件81可以将裂纹两侧的第一集流体51重新电连接，并避免断裂产生的毛刺引起短路。
该电极组件100为卷绕结构，使得该电极组件100包括依次连接的第一弯折段1、第一段2、第二弯折段3和第二段4。连接部5121位于第一段2上。
第二部512包括位于第一弯折段1上的第一弯折部5122和位于第二弯折段3上的第二弯折部5123。
由于弯折的影响，导致第一弯折部5122和/或第二弯折部5123上的第一集流体51受张力作用，在受力时易发生断裂。如果第一弯折部5122和/或第二弯折部5123上的第一集流体51发生断裂，将会使得电化学装置的容量发生损失，或产生毛刺，存在短路的风险。
为了避免第一弯折部5122和/或第二弯折部5123上的第一集流体51断裂或断裂后出现短路的问题，电极组件100还包括第二导电件82和第三导电件83，第二导电件82包覆在第一弯折部5122的外表面上，第三导电件83包覆在第二弯折部5123的外表面上。
第二导电件82和第三导电件83的材料和组成可以与第一导电件81相同，此处不再赘述。
为了保证第二导电件82和第三导电件83连接第一极片5的可靠性，电 极组件100还包括第二粘接件85和第三粘接件86，第二粘接件85粘接第二导电件82和第一极片5，第三粘接件86粘接第三导电件83和第一极片5。
第二粘接件85和第三粘接件86的材料和组成可以与第一粘接件84相同，此处不再赘述。
为了防止第一弯折部5122上的第一集流体51断裂对电化学装置产生不利影响，可以使第二导电件82完全包覆在第一弯折部5122的外表面上，即：沿卷绕方向X，第二导电件82包覆第一弯折部5122，并且两端连接第一段2和第二段4。
如图11和12所示，在一些实施例中，可以使第二导电件82仅包覆第一弯折部5122上易发生第一集流体51断裂的区域，例如第一弯折段1与第一段2和/或第二段4的连接拐点处的第一弯折部5122，或第一弯折段1上的第一弯折部5122。
为了防止第二弯折部5123上的第一集流体51断裂对电化学装置产生不利影响，可以使第三导电件83完全包覆在第二弯折部5123的外表面上，即：沿卷绕方向X，第三导电件83包覆第二弯折部5123，并且两端连接第一段2和第二段4。此时，如果第三导电件83连接第一段2的端部连接于第一外表面5111上设置的第一活性层，那么可以省去第一导电件81，使第三导电件83连接连接部5121的外表面，可以节约成本。
如图13所示，在一些实施例中，可以使第三导电件83仅包覆第二弯折部5123上易发生第一集流体51断裂的区域，例如第二弯折段3与第一段2和/或第二段4的连接拐点处的第二弯折部5123。在一些实施例中，第一导电件81、第二导电件82和第三导电件83中的任意两个可以相互连接。
如图14所示，在一些实施例中，第一导电件81、第二导电件82和第三导电件83可以连接在一起。
如图15和图16所示，电极组件100还包括第一金属部91和第二金属部92。
第一极片5包括第一起始部53和第一末尾部54，第一起始部53靠近于第一极片5的卷绕起始端，第一末尾部54靠近于第一极片5的卷绕末尾端且位于第二部512上。
第二极片6包括第二起始部63和第二末尾部64，第二起始部63靠近于第二极片6的卷绕起始端，第二末尾部64靠近于第二极片6的卷绕末尾端。
第一金属部91和第二金属部92可以分别电连接第一起始部53和第二起始部63，也可以分别电连接第一末尾部54和第二末尾部64，以使得该电化学装置可以将电能输送出去，为外接设备供电。
综上，该电化学装置通过导电件将第一部511和第二部512的外表面连接和/或将第二部512的弯折部外表面包覆，使导电件将易发生集流体断裂的区域包覆，在集流体断裂后，导电件可以将集流体断裂处的极片电连接，降低因集流体断裂而使该电化学装置的容量损失或集流体断裂后造成短路的风 险；该导电件结构简单可靠，成本较低。
另外，本领域技术人员还可在本申请精神内做其它变化，当然，这些依据本申请所做的变化，都应包含在本申请所公开的范围。

Claims (19)

  1. 一种电化学装置，包括电极组件，所述电极组件为卷绕结构，所述电极组件设置有第一弯折段，其中，所述电极组件包括：
    第一极片，包括第一集流体和设置在所述第一集流体上的第一活性物质层，沿卷绕方向，所述第一集流体包括依次连接的第一部和第二部，所述第一部的两面设置有所述第一活性物质层，所述第二部的内表面设置有所述第一活性物质层，所述第二部包括位于所述第一弯折段最外层的弯折部；
    导电件，连接所述第一部的外表面上设置的所述第一活性物质层和所述第二部的外表面，和/或设置在所述弯折部的外表面上。
  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第一粘接件，所述第一粘接件粘接所述导电件和所述第一极片。
  3. 如权利要求1所述的电化学装置，其中，所述导电件包括金属片或导电胶带。
  4. 如权利要求3所述的电化学装置，其中，所述导电胶带包括层叠的基材层和导电层。
  5. 如权利要求4所述的电化学装置，其中，所述导电层包括导电颗粒和粘接材料。
  6. 如权利要求4所述的电化学装置，其中，所述导电胶带还包括粘接层，
    所述粘接层设置在所述基材层和所述导电层之间；或
    所述粘接层设置在所述基材层的表面，所述导电层设置在所述基材层上与所述粘接层同侧的表面。
  7. 如权利要求1所述的电化学装置，其中，所述第二部包括与所述第一部连接的连接部，所述导电件连接所述连接部的外表面。
  8. 如权利要求1所述的电化学装置，其中，所述第二部的外表面显露出所述第一集流体。
  9. 如权利要求1所述的电化学装置，其中，所述第一极片为负极极片，所述弯折部的外表面设置有所述第一活性物质层。
  10. 如权利要求1所述的电化学装置，其中，沿所述卷绕方向，所述第二部为所述电极组件的尾部。
  11. 如权利要求1所述的电化学装置，其中，所述导电件包括第一导电件和第二导电件，所述第一导电件连接所述第一部的外表面上设置的所述第一活性物质层和所述第二部的外表面，所述第二导电件设置在所述弯折部的外表面上。
  12. 如权利要求11所述的电化学装置，其中，所述第一导电件与所述第二导电件相连接。
  13. 如权利要求7所述的电化学装置，其中，所述电极组件还设置有第一段、第二弯折段和第二段，沿所述卷绕方向，所述第一弯折段、所述第一段、所述第二弯折段和所述第二段依次连接，所述连接部位于所述第一段。
  14. 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金属部，沿所述卷绕方向，所述第二部还包括尾部，所述金属部与所述尾部连接。
  15. 如权利要求14所述的电化学装置，其中，所述尾部的两面显露出所述第一集流体。
  16. 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第二极片和设置于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、所述第二极片和所述隔离膜依次层叠卷绕。
  17. 如权利要求4所述的电化学装置，其中，所述基材层包括纤维素衍生物、聚氯乙烯、聚烯烃、聚苯乙烯、聚酯、聚酰亚胺、聚酰胺、聚碳酸酯或聚苯硫醚中的至少一种。
  18. 如权利要求5所述的电化学装置，其中，
    所述粘接材料包括橡胶系树脂、丙烯酸系树脂或硅酮系树脂中的至少一种；
    所述导电颗粒包括金属颗粒、导电高分子或碳材料中的至少一种；
    所述导电高分子包括聚噻吩、聚苯胺、聚吡咯或聚乙炔中的至少一种；
    所述碳材料包括炭黑、乙炔黑、科琴黑、石墨、石墨烯、碳纳米管或碳纳米棒中的至少一种。
  19. 一种电子装置，包括如权利要求1至18任一项所述的电化学装置。
PCT/CN2021/084689 2021-03-31 2021-03-31 电化学装置及电子装置 WO2022205183A1 (zh)

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