WO2022242255A1 - Electrode plate, preparation method, composite current collector, battery and electronic device - Google Patents

Electrode plate, preparation method, composite current collector, battery and electronic device Download PDF

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Publication number
WO2022242255A1
WO2022242255A1 PCT/CN2022/077107 CN2022077107W WO2022242255A1 WO 2022242255 A1 WO2022242255 A1 WO 2022242255A1 CN 2022077107 W CN2022077107 W CN 2022077107W WO 2022242255 A1 WO2022242255 A1 WO 2022242255A1
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WIPO (PCT)
Prior art keywords
metal layer
layer
hole
composite
metal
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PCT/CN2022/077107
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French (fr)
Chinese (zh)
Inventor
谢红斌
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Oppo广东移动通信有限公司
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Publication of WO2022242255A1 publication Critical patent/WO2022242255A1/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
    • 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
    • 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
    • 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
    • H01M4/139—Processes of manufacture
    • 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
    • H01M4/665—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
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/581—Devices or arrangements for the interruption of current in response to temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of energy storage technology, in particular to an electrode pole piece, a preparation method, a composite current collector, a battery and electronic equipment.
  • the application provides an electrode sheet, a composite layer, including a first surface and a second surface opposite to each other, the composite layer is provided with a through hole, and the through hole passes through the first surface and the second surface a conductive connector disposed in the through hole; a first metal layer disposed on the first surface side of the composite layer; and a second metal layer disposed on the second surface of the composite layer side; wherein, the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the Both the first metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole Used for welding tabs.
  • the present application also provides a composite current collector, including: a composite layer including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the a second surface; a conductive connector disposed in the through hole; a first metal layer disposed on the first surface side of the composite layer; and a second metal layer disposed on the composite layer the second surface side; wherein the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and , both the first metal layer and the second metal layer are in contact with the conductive connector.
  • the present application also provides a method for preparing an electrode sheet, including: providing a composite layer, the composite layer including opposite first surfaces and second surfaces; forming through holes on the composite layer, the through holes passing through The first surface and the second surface; a conductive connector is provided in the through hole; and a first metal layer is provided on the first surface side of the composite layer and the composite layer is provided A second metal layer is provided on the second surface side to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second metal layer covers the through hole on the first surface side.
  • the opening on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the The position of the second metal layer corresponding to the through hole is used for welding tabs.
  • the present application also provides a method for preparing an electrode pole piece, including: providing a first metal layer; disposing a composite layer on the first metal layer, the composite layer including opposite first surfaces and second surfaces, The first metal layer is disposed on the first surface; a through hole is formed on the composite layer, and the through hole passes through the first surface and the second surface; a conductive connection is provided in the through hole and a second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, so The second metal layer covers the opening of the through hole on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the first metal layer The position of the layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for welding tabs.
  • the present application also provides a battery, which includes a positive pole piece, a negative pole piece, a separator, and an electrolyte, wherein the positive pole piece and the negative pole piece are the electrode pole pieces as described above, or, as before The electrode pole piece prepared by the preparation method of the electrode pole piece.
  • the present application also provides an electronic device, including a battery cover and the aforementioned battery contained in the battery cover.
  • FIG. 1 is a schematic top view of an electrode sheet provided in the first embodiment of the present application.
  • Fig. 2 is a schematic diagram of an exploded structure of an electrode sheet provided in the first embodiment of the present application.
  • FIG. 3 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 1 along III-III.
  • FIG. 4 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
  • FIG. 5 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 4 along V-V.
  • FIG. 6 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
  • FIG. 7 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
  • FIG. 8 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 7 along VIII-VIII.
  • FIG. 9 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
  • FIG. 10 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 7 along X-X.
  • Fig. 11 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
  • FIG. 12 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 7 along XII-XII.
  • Fig. 13 is a schematic flowchart of a method for preparing an electrode sheet provided by another embodiment of the present application.
  • Fig. 14 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
  • Fig. 15 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
  • Fig. 16 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
  • Fig. 17 is a schematic flow chart of another method for preparing an electrode sheet provided by another embodiment of the present application.
  • Fig. 18 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
  • Fig. 19 is a schematic structural diagram of a battery provided by another embodiment of the present application.
  • Fig. 20 is a schematic structural view of an electrode assembly of a battery provided in another embodiment of the present application.
  • Fig. 21 is a schematic top view structural diagram of an electronic device provided by another embodiment of the present application.
  • the present application provides an electrode pole piece, the electrode pole piece comprising:
  • a composite layer including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the second surface;
  • the first metal layer covers the opening of the through hole on the first surface side
  • the second metal layer covers the opening of the through hole on the second surface side
  • the first Both the metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for Solder the tabs.
  • the electrode tab further includes a first active material layer disposed on the surface side of the first metal layer away from the composite layer, and a layer of active material disposed on the surface side of the second metal layer away from the composite layer.
  • the second active material layer wherein, a first opening is provided on the first active material layer at a position corresponding to the through hole, so that the first metal layer is partially exposed to the first opening.
  • the through hole is located at one end of the extension direction of the composite layer; a second window is set on the second active material layer corresponding to the through hole, so that the second metal layer is partially exposed to said second fenestration;
  • the part of the first metal layer exposed to the first window and/or the part of the second metal layer exposed to the second window is used for soldering terminal lugs.
  • the through hole is located in the middle of the extending direction of the composite layer and is located at one side edge of the composite layer in the width direction; the second active material layer completely covers the second metal layer; the second active material layer completely covers the second metal layer; The part of a metal layer exposed to the first window is used for welding the tab.
  • the electrode pole piece is used for welding a plurality of tabs
  • the through hole is located in the middle of the extension direction of the composite layer and is located on one side edge of the composite layer in the width direction, and the number of the through holes is
  • the second active material layer completely covers the second metal layer; the parts of the first metal layer exposed to the plurality of first openings are used for correspondingly welding a plurality of tabs.
  • the conductive connector is deposited metal; at least one of the first metal layer and the second metal layer is integrated with the conductive connector.
  • the conductive connector is a solidified conductive paste containing conductive particles, or the conductive connector is a metal sheet.
  • the composite layer includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene Diol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polynaphthalene Ethyl ester, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, polyethylene, polychlorinated Ethylene, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styren
  • first metal layer and the second metal layer are disposed on the first surface side and the second surface side of the composite layer through a deposition process, or, the first metal layer and the The second metal layer is a metal foil and is bonded to the first surface side and the second surface side of the composite layer by adhesive.
  • the composite layer includes conductive agent, binder, active material and metal powder;
  • the conductive agent is carbon nanotube, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive At least one of the materials;
  • the binder is selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorine One or more of chemical rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide;
  • the active material is lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium cobaltate, manganese At least one of lithium oxide, lithium nickelate, lithium nickel-cobalt manganate, lithium-rich manganese-based materials, lithium nickel-cobalt aluminat
  • the mass ratio of the metal powder, the binder and the conductive agent is (50-70):(5-35):(10-20).
  • the composite layer is reused as an adhesive to directly bond with the first metal layer and the second metal layer.
  • the thickness of the composite layer is 1 micrometer to 40 micrometers; the thickness of the first metal layer and the second metal layer are both 1 nanometer to 10 micrometers.
  • a composite current collector which includes:
  • a composite layer including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the second surface;
  • the first metal layer covers the opening of the through hole on the first surface side
  • the second metal layer covers the opening of the through hole on the second surface side
  • the first Both the metal layer and the second metal layer are in contact with the conductive connector.
  • the composite layer includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene Diol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polynaphthalene Ethyl ester, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, polyethylene, polychlorinated Ethylene, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styren
  • the composite layer includes conductive agent, binder, active material and metal powder; wherein, the conductive agent is carbon nanotube, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material At least one of; the binder is selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber , polyvinyl alcohol, polyvinylidene fluoride, polyamide; the active material is lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium cobaltate, lithium manganate , lithium nickelate, lithium nickel-cobalt manganate, lithium-rich manganese-based materials, lithium-nickel-cobalt-aluminate, silicon oxide, tin oxide
  • the present application provides a method for preparing an electrode sheet, which includes:
  • a first metal layer is provided on the first surface side of the composite layer and a second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein the first metal layer covers The opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first metal layer and the second metal layer All are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for soldering tabs.
  • the first metal layer and the second metal layer are formed on opposite sides of the composite layer by at least one process of evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating,
  • the conductive connector is formed in the same process as at least one of the first metal layer and the second metal layer; or, the first metal layer and the second metal layer are respectively bonded to the The opposite side surfaces of the composite layer.
  • the present application provides a method for preparing an electrode sheet, which includes:
  • a composite layer is disposed on the first metal layer, the composite layer includes opposite first surfaces and second surfaces, and the first metal layer is disposed on the first surface;
  • a second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second The metal layer covers the opening of the through hole on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the first metal layer and the The position corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for welding tabs.
  • the present application provides a battery, which includes a positive pole piece, a negative pole piece, a separator, and an electrolyte, wherein the positive pole piece and the negative pole piece are any one of the electrodes described in the first aspect A pole piece, or an electrode pole piece prepared by the electrode pole piece preparation method described in any one of the third aspect and the fourth aspect.
  • the present application provides an electronic device, which includes a battery cover and the battery according to the fifth aspect contained in the battery cover.
  • An embodiment of the present application provides an electrode sheet, including: a composite layer, including a first surface and a second surface opposite to each other, the composite layer is provided with a through hole, and the through hole passes through the first surface and the second surface. the second surface; a conductive connector disposed in the through hole; a first metal layer disposed on the first surface side of the composite layer; and a second metal layer disposed on the composite layer The second surface side; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second metal layer covers the opening of the through hole on the second surface side, Moreover, both the first metal layer and the second metal layer are in contact with the conductive connector; the position corresponding to the first metal layer and the through hole or the second metal layer is in contact with the through hole The positions corresponding to the holes are used for welding tabs.
  • a through hole is provided on the composite layer, and a conductive connector is provided in the through hole, and the first metal layer and the second metal layer on the opposite sides of the composite layer are respectively covered.
  • the through holes are opened on the first surface side and the second surface side and both are in contact with the conductive connector, so that the first metal layer and the second metal layer on opposite sides of the composite layer are electrically connected. Therefore, when welding the tabs, only the tabs need to be welded on one layer of the first metal layer and the second metal layer on both sides of the composite layer, and the connection between the tabs and the first metal layer and the second metal layer can be realized.
  • the electrode pole piece of the present application is set in the form of a composite current collector, which also has high safety.
  • bifurcated tabs are used to connect the metal layers on both sides, that is, the metal layers on both sides of the pole piece are respectively conducted by dividing the tabs into two halves.
  • the manufacturing process is relatively complicated; compared with the prior art
  • the bifurcated tabs of the present application connect the first and second metal layers through the conductive connector inside the composite layer, so that only one side of the metal layer needs to be welded with tabs, and the manufacturing process is relatively simple. .
  • an electrode pad 100 provided in the first embodiment of the present application.
  • the electrode pole piece 100 includes a composite current collector 10 and an active material layer 20; the composite current collector 10 includes a composite layer 11 and is disposed on opposite sides of the composite layer 11 The first metal layer 12 and the second metal layer 13.
  • the first metal layer 12 and the second metal layer 13 can be metal foils formed by rolling, or deposited metal layers formed by electroplating, electroless plating, etc., or other metal layers. Formed conductive metal layer.
  • the first metal layer 12 and the second metal layer 13 can be aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or alloys thereof at least one of .
  • the material of the first metal layer 12 and the material of the second metal layer can be different, for example, the material of the first metal layer 12 is copper, and the material of the second metal layer 13 Aluminum; in some other embodiments, the material of the first metal layer 12 and the material of the second metal layer can also be the same, for example, the material of the first metal layer 12 and the material of the second metal layer The materials are all copper or all aluminum.
  • the first metal layer 12 and the second metal layer 13 can be made of metal aluminum or aluminum alloy; when the electrode pole piece When 100 is used as a negative electrode sheet, the first metal layer 12 and the second metal layer 13 can be made of copper or copper alloy materials.
  • the composite layer 11 includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, Polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, Polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, Polyethylene, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene
  • the composite layer 11 is mainly made of polymer materials.
  • the melting point of polymer materials is lower than that of metal materials. Therefore, as the temperature of the battery rises, when the temperature of the battery reaches the melting point of the composite layer 11, the composite layer 11 will melt, thereby causing damage to the pole piece, thereby cutting off the current, thereby improving the safety of the battery problem, and when the lithium-ion battery is subjected to external physical impact, especially when it is impacted by sharp objects or heavy objects, when the metal layers on both sides of the composite current collector are broken, the middle composite layer can rely on its own ductility.
  • the first metal layer 12 and the second metal layer 13 are formed on the surface of the composite layer 11 by plating or the like, that is, the first metal layer 12 and the second metal layer 13 It is a deposited metal layer formed by deposition methods, such as chemical deposition, electroplating deposition, physical vapor deposition, magnetron sputtering deposition, etc.
  • the first metal layer 12 and the second metal layer 13 are metal foils, which are bonded to the surface of the composite layer 11 by adhesive.
  • the composite layer 11 includes metal powder and a binder
  • the metal powder can be aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or At least one of its alloy powder, etc.
  • the binder can be polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber , polyurethane, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide, etc., wherein, in this embodiment, the binder wraps the metal powder, so that the composite layer 11 also has Better ductility and lower melting point can improve the safety of the battery.
  • the use of the composite layer 11 containing metal powder can also make the contact resistance of the composite current collector 10 smaller, thereby making the composite collector
  • the power of the fluid 10 is improved; the mass ratio of the metal powder to the binder can be set according to the situation. Generally speaking, the amount of the binder should not be too much. According to the experimental situation, when the binder is too much, the The cycle performance of the battery is affected.
  • the mass ratio of the metal powder to the binder is 50-70:5-35.
  • the composite layer 11 may also include a conductive agent, and the conductive agent may be at least one of carbon nanotubes, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material, etc.
  • the conductive agent can improve the performance of the battery, wherein the amount of the conductive agent should not be too much to avoid the impact on the potential of the pole piece, optionally, the mass ratio of the metal powder to the conductive agent is 50-70:10- 20.
  • the composite layer 11 may also include an active material, and the addition of the active material may also improve the performance of the battery.
  • the active material may be lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, At least one of lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, silicon oxide, tin oxide, lithium titanate, and the like. It can be understood that the material forming the composite layer 11 can be formed on the surface of the first metal layer 12 or the second metal layer 13 by coating etc. and cured to form the composite layer 11.
  • the first The metal layer 12 and the second metal layer 13 can be metal foils formed by calendering, electrolysis, etc., and the composite layer 11 can be reused as an adhesive to directly adhere the first metal layer 12 and the second metal layer 13.
  • the first metal layer 12 can be a metal foil formed by calendering, electrolysis, etc.
  • the composite layer 11 can be reused as an adhesive to bond the first The metal layer 12 is directly bonded to the surface of the composite layer 11 , and the second metal layer 13 may be formed on the surface of the composite layer 11 by deposition.
  • the thickness of the composite layer 11 is 1 micron to 40 microns; the thickness of the first metal layer 12 and the second metal layer 13 are both 1 nanometer to 10 microns; wherein, if the If the thickness of the composite layer 11 is too small, the support for the composite current collector 10 will not be sufficient; if the thickness of the composite layer 11 is too large, the composite current collector 10 will be too thick and heavy, which is not conducive to the thinning of the battery ; If the thickness of the first metal layer 12 and the second metal layer 13 is too small, then the conductivity is insufficient and the internal resistance is large, if the thickness of the first metal layer 12 and the second metal layer 13 is too large Larger, on the one hand, the composite current collector 10 will be too thick, which is not conducive to the thinning of the battery, and on the other hand, it will also affect the energy density of the battery.
  • the composite layer 11 has a thickness of 3 microns to 20 microns; the first metal layer 12 and the second metal layer 13 have a thickness of 100 nanometers to 1 micron.
  • the composite layer 11 includes opposite first surface 101 and second surface 102, and the composite layer 11 is provided with a through hole 111, and the through hole 111 passes through the first surface 101 and the second surface.
  • the positions of the electrode tabs 100 corresponding to the through holes 111 are used for welding tabs.
  • the through hole 111 can be in various shapes such as rectangle, circle, ellipse, sector, polygon or irregular figure, and is not limited to what is shown in the diagram of this application; the through hole 111 can be arranged in the compound Any position in the direction of extension of the layer 11, for example, depending on the needs of the battery, as shown in Figure 4 and Figure 6, the through hole 111 can be located at the end of the direction of extension of the composite layer 11, specifically, Figure 4
  • the through hole 111 in the composite layer 11 does not pass through the width direction of the composite layer 11, and the through hole 111 in Fig. 6 runs through the width direction of the composite layer 11; It is located in the middle of the extending direction of the composite layer 11 and is located at one side edge of the composite layer 11 in the width direction.
  • the number of the through holes 111 may be one or more, as shown in FIG. 9 to FIG. 10 , the number of the through holes 111 is multiple.
  • the electrode pole piece 100 is in the shape of a long sheet, and the extending direction of the composite layer 11 is the long direction of the electrode pole piece 100, and further, the composite layer 11 and the first surface 101 and the The direction parallel to the second surface 102 and perpendicular to the extending direction is the width direction of the electrode sheet 100 .
  • the through hole 111 is provided with a conductive connector 14 .
  • the first metal layer 12 covers the opening of the through hole 111 on the first surface 101 side
  • the second metal layer 13 covers the opening of the through hole 111 on the second surface 102 side
  • Both the first metal layer 12 and the second metal layer 13 are in contact with the conductive connector 14 .
  • the position of the first metal layer 12 corresponding to the through hole 111 or the position of the second metal layer 13 corresponding to the through hole 111 is used for welding tabs, wherein, directly on the first metal layer 12
  • the position corresponding to the through hole 111 or the position of the second metal layer 13 corresponding to the through hole 111 is welded with tabs, so that the tabs can be connected to the first metal layer 12 and the second metal layer 12 .
  • the electrical conductivity between the layers 13 is better, which also makes the safety performance of the battery better.
  • the through hole 111 may penetrate the composite layer 11 obliquely or vertically; preferably, the through hole 111 vertically penetrates the composite layer 11 .
  • the conductive connector 14 can be a deposited metal block, and the deposited metal block can be formed by methods such as chemical deposition, electroplating deposition, physical vapor deposition, magnetron sputtering deposition, etc.; the conductive connector 14 can fill up the through hole 111; when at least one of the first metal layer 12 and the second metal layer 13 is also formed by a deposition process, the first metal layer 12 and the second metal layer At least one of the layers 13 can be formed simultaneously with the conductive connector 14 in the same process, so as to be an integral structure with the same material.
  • the conductive connector 14 can also be a cured conductive paste containing conductive particles, that is, the conductive paste containing conductive particles can be filled in the through hole 111 and cured.
  • the conductive paste obtains the conductive connector 14 ; the conductive connector 14 can fill the through hole 111 .
  • the conductive connector 14 can also be a metal sheet directly placed in the through hole 111, the shape and size of the metal sheet are substantially the same as the shape and size of the through hole 111 or are exactly the same, so that the metal sheet can be just accommodated in the through hole 111, which makes the overall stability of the composite current collector 10 better; of course, it can be understood that the shape and size of the metal sheet are different from the described
  • the shape and size of the through hole 111 are approximately the same or completely the same as the preferred embodiment of the present application, but the shape and size of the metal sheet and the shape and size of the through hole 111 are not the same and also belong to the protection scope of the present application;
  • the material of the metal sheet is preferably the same as that of the first metal layer 12 and the second metal layer 13, so that the current on the metal sheet and the first metal layer 12 and the second metal layer 13 More uniform, to prevent local overheating.
  • the thickness of the conductive connector 14 is the same as the thickness of the composite layer 11, so that the first metal layer 12 and the second metal layer 13 can be connected with the conductive connector 14 better contact, and make the surface of the composite current collector 10 relatively flat; of course, it can be understood that the thickness of the conductive connector 14 is the same as the thickness of the composite layer 11 is a preferred embodiment of the present application, but If the thickness of the conductive connector 14 is slightly larger or smaller than the thickness of the through hole 111 and the basic functions of the application can be realized, it also belongs to the scope of protection of the application.
  • the electrode pad 100 further includes a first an active material layer 15 , and a second active material layer 16 disposed on the surface side of the second metal layer 13 away from the composite layer 11 .
  • the material of the first active material layer 15 and the second active material layer 16 can be set as a positive electrode active material or a negative electrode active material according to the polarity of the electrode sheet 100;
  • the second active material layer 16 can be formed by a coating process;
  • the positive electrode active material can include at least one lithiated intercalation compound that can reversibly intercalate and deintercalate lithium ions, for example, including but not limited to lithium cobaltate, One or more of lithium nickel cobalt manganate, lithium nickel cobalt aluminate, lithium manganate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium iron phosphate, lithium titanate and lithium-rich manganese-based materials
  • the negative electrode active material can include any material that can electrochemically occlude and release metal ions such as lithium ions, for example, including but not limited to carbonaceous materials, silicon carbon materials, alloy materials or lithium metal-containing composite oxide materials one or more of .
  • both the positive electrode active material and the negative electrode active material may also include materials such as conductive agent and binder; the present invention does not limit the type of conductive agent, as examples, the conductive agent is graphite, superconducting carbon, acetylene One or more of black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers; the present invention does not limit the type of binder, as an example, the binder is Styrene rubber (SBR), water-based acrylic resin (water-based acrylic resin), carboxymethyl cellulose (CMC), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer One or more of (EVA), polyvinyl alcohol (PVA) and polyvinyl butyral (PVB).
  • SBR Styrene rubber
  • water-based acrylic resin water-based acrylic resin
  • CMC carboxymethyl cellulose
  • PVDF polyvinylidene fluoride
  • the positive electrode active material or the negative electrode active material can be selected to be formed on the composite current collector 10 as required, for example, if a positive electrode sheet is formed, then the positive electrode active material is formed on the composite current collector 10, such as a negative electrode sheet is formed, Then the negative electrode active material is formed on the composite current collector 10 .
  • a first opening 151 is provided on the first active material layer 15 at a position corresponding to the through hole 111, so that the first metal layer 12 is partially exposed to the first opening 151. , the part of the first metal layer 12 exposed to the first opening 151 can be used for soldering tabs.
  • the through hole 111 is located at one end of the extension direction of the composite layer 11, and the position of the electrode pad 100 corresponding to the through hole 111 is used for welding terminal ear; a second window 161 is provided on the second active material layer 16 corresponding to the through hole 111, so that the second metal layer 13 is partially exposed to the second window 161;
  • the part of the first metal layer 12 exposed to the first opening 151 or the part of the second metal layer 13 exposed to the second opening 161 can be used for soldering terminal lugs; that is, When the position of the electrode pole piece 100 corresponding to the through hole 111 is used for welding the terminal lug, both the first active material layer 15 and the second active material layer 16 can avoid the electrodes.
  • the position corresponding to the pole piece 100 and the through hole 111 is coated, so the preparation process is relatively simple.
  • the first metal layer 12 or the second metal layer 13 can be used for welding the terminal ear, more convenient.
  • the through hole 111 is located in the middle of the extending direction of the composite layer 11 and is located at one side edge of the composite layer 11 in the width direction.
  • the position of the electrode pole piece 100 corresponding to the through hole 111 is used for welding the middle tab; the second active material layer 16 completely covers the second metal layer 13; the first metal layer 12 is exposed to the second metal layer 13; A part of the window 151 can be used for welding the tab; that is, when the position of the electrode tab 100 corresponding to the through hole 111 is used for welding the middle tab, the first active material layer 15 And one layer of the second active material layer 16 can avoid the position corresponding to the electrode sheet 100 and the through hole 111 and coat it.
  • the first active material layer on both sides Both the active material layer 15 and the second active material layer 16 have windows that increase the process flow and are not necessary, so this embodiment only forms windows in the first active material layer 15; wherein, when the When the position of the electrode pole piece 100 corresponding to the through hole 111 is used for welding a tab, the first opening 151 may be formed by a laser ablation process.
  • the electrode pole piece 100 can be used for welding multiple tabs, the number of the through holes 111 is multiple, the electrode pole piece 100 and each The positions corresponding to the through holes 111 are all used for welding a tab; correspondingly, first windows 151 are provided at positions corresponding to each of the through holes 111 on the first active material layer 15, so that the Multiple parts of the first metal layer 12 are exposed to multiple first openings 151, and the parts of the first metal layer 12 exposed to the first openings 151 are used for welding multiple middle tabs; it can be understood that , the second active material layer 16 may completely cover the second metal layer 13 .
  • the shape of the first window 151 and the second window 161 is a rectangle for easy processing and subsequent welding of tabs; optionally, the opening shape of the through hole 111 It can also be the same as the shape of the first window 151 and the second window 161, and the opening size of the through hole 111 can also be the same as the size of the first window 151 and the second window 161. The same, so that the electrode sheet 100 has better electrical conductivity.
  • the opening shape of the through hole 111 can also be different from the shapes of the first window 151 and the second window 161, and the opening size of the through hole 111 can also be different from that of the first window. 151 and the second window 161 are different in size.
  • the electrode tab 100 may further include tabs 17 , and the tabs 17 are welded to the electrode tab 100 corresponding to each of the through holes 111
  • the location of refer to the above for details, and will not be repeated here.
  • the embodiment of the present application also provides a composite current collector 10 as described above, the composite current collector 10 includes: a composite layer 11, including an opposite first surface 101 and a second surface 102, and the composite layer 11 is provided with There is a through hole 111, the through hole 111 penetrates through the first surface 101 and the second surface 101; the conductive connector 14 is arranged in the through hole 111; the first metal layer 12 is arranged in the composite The first surface 101 side of the layer 11; and the second metal layer 13, disposed on the second surface 102 side of the composite layer 11; wherein, the first metal layer 12 covers the through hole 111 on the The opening on the side of the first surface 01, the second metal layer 13 covers the opening of the through hole 111 on the side of the second surface 102, and the first metal layer 12 and the second metal layer 13 are all in contact with the conductive connector 14 .
  • the composite current collector 10 includes: a composite layer 11, including an opposite first surface 101 and a second surface 102, and the composite layer 11 is provided with There is a through hole
  • FIG. 13 is a schematic diagram of a method for preparing an electrode pole piece provided by another embodiment of the present application; the method for preparing an electrode pole piece includes steps:
  • the composite layer 11 can be polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, Polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polynaphthalene Ethylene formate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, polyethylene, Polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-
  • the step of forming the through hole on the composite layer may be: forming the through hole on the composite layer by mechanical processing, or forming the through hole on the composite layer by laser ablation .
  • the step of arranging the conductive connector in the through hole may be: filling the conductive paste containing conductive particles in the through hole, and curing the conductive paste to obtain the conductive connector; or, in the through hole placing a conductive metal sheet in the through hole; or, filling the conductive connecting piece in the through hole by depositing metal.
  • the first metal layer and the first metal layer can be formed on opposite sides of the composite layer by at least one of deposition processes such as evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating.
  • the second metal layer; at this time, the conductive connector and at least one of the first metal layer and the second metal layer may be formed by the same process, that is, the first metal layer and the second metal layer are formed by deposition At least one of the second metal layers is simultaneously deposited in the through hole to form the conductive connection member.
  • first metal layer and the second metal layer can also be metal foils, and the first metal layer and the second metal layer can be directly bonded to the composite layer by glue. opposite sides.
  • the through hole is located at one end of the extending direction of the composite layer, and both the first active material layer and the second active material layer are formed avoiding the through hole, so that the A first opening is formed on the first active material layer at a position corresponding to the through hole, so that the first metal layer is partially exposed to the first opening, and the second active material layer is connected to the through hole.
  • a second opening is formed at the position corresponding to the hole, so that the second metal layer is partially exposed to the second opening; the first metal layer is exposed to the part of the first opening or the second metal layer The portion of the layer exposed to the second opening is used for soldering terminal tabs.
  • the through hole is located in the middle of the extension direction of the composite layer and at one side edge of the composite layer in the width direction.
  • the number of said through holes can also be multiple, and correspondingly multiple windows can be formed, and the method of forming multiple through holes and multiple window openings is the same as the aforementioned method for forming through holes and openings.
  • the method of opening the window is the same and will not be repeated here.
  • the method for preparing the electrode tab may further include a step of welding the tab on the exposed metal layer.
  • FIG. 16 is a schematic diagram of a method for preparing an electrode pole piece provided by another embodiment of the present application; the preparation method of the electrode pole piece includes steps:
  • the composite layer includes opposite first surfaces and second surfaces, the first metal layer is disposed on the first surface, and formed on the composite layer a through hole, the through hole passing through the first surface and the second surface;
  • the first metal layer is a metal foil formed by calendering or electrolysis.
  • the composite layer can be obtained by mixing metal powder and binder, coating on the surface of the first metal layer and curing; wherein, the metal powder can be aluminum, copper, nickel, copper, cobalt, tungsten, At least one of the powders of tin, lead, iron, silver, gold, platinum or their alloys, etc., the binder can be selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene One or more of vinyl fluoride, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide, etc.; the metal powder and the binder
  • the mass ratio can be set according to the situation. In general, the amount of the binder should not be too much. According to the experimental situation, when the binder is too much, the cycle performance of the battery will be affected.
  • the metal powder The
  • the material forming the composite layer can also include a conductive agent, that is, a conductive agent can also be mixed in the metal powder and the binder;
  • the conductive agent can be carbon nanotubes, graphene , conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material, etc., the conductive agent can improve the performance of the battery, and the amount of the conductive agent should not be too much to avoid affecting the electrode potential Influence, optionally, the mass ratio of the metal powder to the conductive agent is 50-70:10-20.
  • the material forming the composite layer can also include an active material, that is, an active material can also be mixed in the metal powder and the binder;
  • the active material can be lithium iron phosphate, manganese phosphate Lithium iron, lithium vanadium phosphate, lithium vanadium oxyphosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, nickel cobalt lithium manganate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, silicon oxide, tin oxide, titanium At least one of lithium oxide and the like.
  • a composite layer is formed on the first metal layer, and the step of forming a through hole on the composite layer may be:
  • a shielding member is provided on the first metal layer, and the material forming the composite layer is coated on the surface of the first metal layer, so that the material forming the composite layer avoids the setting of the shielding member, and then removed In the shielding member, the through hole is formed at a position corresponding to the shielding member.
  • the material forming the composite layer may be cured before removing the shielding member, or may be cured after forming the second metal layer.
  • a composite layer is formed on the first metal layer, and the step of forming a through hole on the composite layer may be:
  • the composite layer in a partial area may be removed by mechanical means or laser ablation.
  • the material forming the composite layer may be cured before removing the composite layer in a part of the region, or may be cured after forming the second metal layer.
  • the step of arranging the conductive connector in the through hole may be: filling the conductive paste containing conductive particles in the through hole, curing the conductive paste to obtain the conductive connector; or, directly forming the conductive connector in the through hole. A conductive metal sheet is placed in the hole; or, the conductive connector is filled in the through hole by depositing metal.
  • the second metal layer may be formed on opposite sides of the composite layer by at least one of deposition processes such as evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating, At this time, it is preferable that the material forming the composite layer can be solidified before forming the second metal layer; in addition, the conductive connector and the second metal layer can be formed in the same process, that is, forming the second metal layer At the same time, the metal layer is filled in the through hole by depositing metal to form the conductive connector.
  • deposition processes such as evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating
  • the second metal layer can also be a metal foil.
  • the material forming the composite layer can be solidified after forming the second metal layer, and the material forming the composite layer can also have adhesive properties. Using glue, the second metal layer can be laid on the material forming the composite layer, and then both the first metal layer and the second metal layer are bonded to the composite layer through rolling and curing processes.
  • the second metal layer can also be a metal foil, and the material forming the composite layer can be cured before forming the second metal layer, and then the second metal layer can be glued together A layer is bonded to the side of the composite layer remote from the first metal layer.
  • the through hole is located at one end of the extension direction of the composite layer, and the first active material layer and the second active material layer are formed avoiding positions corresponding to the through hole, Therefore, a first opening is formed on the first active material layer at a position corresponding to the through hole, so that the first metal layer is partially exposed to the first opening, and the second active material layer A second opening is formed at a position corresponding to the through hole, so that the second metal layer is partially exposed to the second opening; the part of the first metal layer exposed to the first opening or the entire The part of the second metal layer exposed to the second window is used for soldering the terminal lug.
  • the through hole is located in the middle of the extending direction of the composite layer and is located at one side edge of the composite layer in the width direction.
  • the second active material layer may completely cover the second metal layer.
  • the first active material layer corresponding to the through hole may be removed by laser ablation, ultrasonic removal or knife cutting.
  • the window can be formed directly when the active material layer is formed, or it can be removed after the active material layer is fully laid.
  • the number of said through holes can be multiple, and correspondingly multiple windows can be formed.
  • the method of window is the same, and will not be repeated here.
  • the method for preparing the electrode tab may further include the step of welding tabs on the exposed metal layer.
  • FIG. 19 and FIG. 20 another embodiment of the present application provides a battery 400, the battery 400 includes an electrode assembly 410 and an electrolyte 420, the electrode assembly 410 includes a positive pole piece 401, a negative pole piece 402, and a separator 403, wherein, the positive pole piece and the negative pole piece are the electrode pole pieces described in the first embodiment of the present application, or the electrode pole pieces prepared by the method for preparing the electrode pole pieces described in the second embodiment of the present application.
  • the electrode assembly 410 can be obtained by winding the positive pole piece 401 , the negative pole piece 402 and the separator 403 .
  • another embodiment of the present application also provides an electronic device 500, the electronic device 500 includes a battery cover 501 and the battery 400 contained in the battery cover 501 as described in the previous embodiments of the present application .
  • the electronic device 500 is, for example, a smart phone, a notebook computer, a tablet computer, a game device, a portable computing device, a wearable device, or the like.
  • the electrode sheet of this case will be described below in combination with specific embodiments.
  • a battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, one end of the extension direction of the PET film layer is formed with a through hole, and the through hole is filled with aluminum flakes, and the PET film The aluminum layers on both sides of the layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece is welded correspondingly to the through hole; The negative pole piece is formed by coating the surface of metal copper with negative active material.
  • PTT ethylene glycol phthalate
  • the battery of Example 1 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
  • a battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, a through hole is formed on the edge of the middle part of the extension direction of the PET film layer, and aluminum flakes are filled in the through hole, and the PET film layer The aluminum layers on both sides of the film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece corresponds to the through hole Welding; the negative pole piece is formed by coating the surface of metal copper with negative active material.
  • the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector
  • the battery of Example 2 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
  • a battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair Deposited aluminum layers are respectively formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein a plurality of through-holes are formed on the middle edge of the extending direction of the PET film layer, and aluminum sheets are filled in the through-holes, so that The aluminum layers on both sides of the PET film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes through holes and the deposited aluminum layer, and the multiple tabs of each positive electrode sheet are connected to the aluminum sheet.
  • the plurality of through holes are correspondingly welded; the negative electrode sheet is formed by coating the negative electrode active material on the surface of metal copper.
  • the battery of Example 3 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
  • a battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, one end of the extension direction of the PET film layer is formed with a through hole, and the through hole is filled with aluminum flakes, and the PET film The aluminum layers on both sides of the aluminum layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece is welded correspondingly to the through hole
  • the negative electrode sheet is formed by coating the negative electrode active material on the surface of the composite current collector, and the structure of the composite current collector is that a deposited copper layer is formed on both sides of the polyethylene terephthalate (PET
  • the battery of Example 4 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
  • a battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, a through hole is formed on the edge of the middle part of the extension direction of the PET film layer, and aluminum flakes are filled in the through hole, and the PET film layer The aluminum layers on both sides of the film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece corresponds to the through hole Welding; the negative electrode sheet is formed by coating the negative electrode active material on the surface of the composite current collector, and the structure of the composite current collector is that a deposited copper layer is formed on both sides of the polyethylene terephthal
  • the battery of Example 5 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
  • a battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, a through hole is formed on the edge of the middle part of the extension direction of the PET film layer, and aluminum flakes are filled in the through hole, and the PET film layer The aluminum layers on both sides of the film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the multiple tabs of each positive electrode sheet are connected to the multiple The through-holes are correspondingly welded; the negative pole piece is formed by coating the negative active material on the surface of the composite current collector, and the structure of the composite current collector is polyethylene terephthalate (PET) film layer
  • a deposited copper layer is formed, wherein a through hole is formed on the middle edge of the extending direction of the PET film layer, and copper sheets are filled in the through holes, and the copper layers on both sides of the PET film layer are all connected to the copper sheet
  • the negative electrode active material exposes the deposited copper layer corresponding to the through holes, and the plurality of tabs of each negative electrode sheet are welded correspondingly to the plurality of through holes.
  • the battery of Example 6 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
  • a battery is prepared, and the battery includes a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; wherein, the positive pole piece is made of metal aluminum, and the negative pole piece is made of metal copper.
  • the tabs are respectively welded to the ends of the positive pole piece and the negative pole piece in the extending direction.
  • the battery of Comparative Example 1 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
  • a battery is prepared, and the battery includes a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; wherein, the positive pole piece is made of metal aluminum, and the negative pole piece is made of metal copper.
  • the tabs are respectively welded to the middle edges of the positive pole piece and the negative pole piece in the extending direction.
  • the battery of Comparative Example 2 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
  • a battery is prepared, and the battery includes a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; wherein, the positive pole piece is made of metal aluminum, and the negative pole piece is made of metal copper.
  • a plurality of tabs are respectively welded to the middle edge of each positive pole piece and the negative pole piece in the extending direction.
  • the battery of Comparative Example 3 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
  • test methods of heavy object impact test acupuncture test, extrusion test, battery 0.2C volumetric energy density and maximum charge rate are all tested according to GB/T 18287-2000 national standard.
  • the heavy object impact test, acupuncture test and extrusion test of embodiment 1 to embodiment 6 are all 100% passed, while the heavy object impact test and acupuncture test of comparative example 1 to comparative example 3 And the extrusion test all failed, that is to say, the safety factor of the battery comprising the electrode pole piece of the embodiment of the present application is higher than that of the battery whose electrodes are all pure metal, and the electrode pole piece of the present application can greatly improve the safety factor of the battery. Safety factor.

Abstract

Provided in the present application is an electrode plate. The electrode plate comprises: a composite layer, which comprises a first surface and a second surface opposite each other, wherein a through hole is provided on the composite layer, and the through hole penetrates the first surface and the second surface; a conductive connector, which is provided inside the through hole; a first metal layer, which is provided on the first surface side of the composite layer; and a second metal layer, which is provided on the second surface side of the composite layer, wherein the first metal layer covers an opening of the through hole on the first surface, the second metal layer covers an opening of the through hole on the second surface, and both the first metal layer and the second metal layer come into contact with the conductive connector; and a position on the first metal layer corresponding to the through hole or a position on the second metal layer corresponding to the through hole is used for welding a tab. Further provided in the present application are a preparation method for an electrode plate, and a composite current collector, a battery and an electronic device.

Description

电极极片、制备方法、复合集流体、电池及电子设备Electrode pole piece, preparation method, composite current collector, battery and electronic equipment 技术领域technical field
本申请涉及储能技术领域，具体涉及一种电极极片、制备方法、复合集流体、电池及电子设备。The present application relates to the field of energy storage technology, in particular to an electrode pole piece, a preparation method, a composite current collector, a battery and electronic equipment.
背景技术Background technique
大量实验结果表明，电池内短路是造成锂离子电池安全隐患的根本所在。有研究表明，采用具有树脂层两面复合有金属层的多层结构的集流体，随着电池温度的上升，当达到树脂层的材料的熔点时，该集流体的树脂层熔融而使极片破损，由此切断电流，从而可以改善电池的安全问题。然而，由于复合集流体内部的复合高分子材料不导电两表面金属层电子不导通，采用传统方式焊接后，只能实现单侧电流的导通。所以针对使用目前的复合集流体的锂离子电池，业界需要一种合适的电池结构以满足电池极耳的电子导通的需要。A large number of experimental results show that the short circuit in the battery is the root cause of the safety hazard of lithium-ion batteries. Studies have shown that using a current collector with a multi-layer structure with a metal layer on both sides of the resin layer, as the temperature of the battery rises, when the melting point of the material of the resin layer is reached, the resin layer of the current collector melts and the pole piece is damaged. , thereby cutting off the current, which can improve the safety of the battery. However, since the composite polymer material inside the composite current collector is non-conductive and the metal layers on the two surfaces are not electrically conductive, after welding in the traditional way, only one-side current conduction can be achieved. Therefore, for lithium-ion batteries using current composite current collectors, the industry needs a suitable battery structure to meet the electronic conduction requirements of the battery tabs.
发明内容Contents of the invention
本申请提供了一种电极极片，复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；导电连接件，设置于所述贯通孔内；第一金属层，设置于所述复合层的所述第一表面侧；及第二金属层，设置于所述复合层的所述第二表面侧；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。The application provides an electrode sheet, a composite layer, including a first surface and a second surface opposite to each other, the composite layer is provided with a through hole, and the through hole passes through the first surface and the second surface a conductive connector disposed in the through hole; a first metal layer disposed on the first surface side of the composite layer; and a second metal layer disposed on the second surface of the composite layer side; wherein, the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the Both the first metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole Used for welding tabs.
本申请还提供了一种复合集流体，包括：复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；导电连接件，设置于所述贯通孔内；第一金属层，设置于所述复合层的所述第一表面侧；及第二金属层，设置于所述复合层的所述第二表面侧；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触。The present application also provides a composite current collector, including: a composite layer including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the a second surface; a conductive connector disposed in the through hole; a first metal layer disposed on the first surface side of the composite layer; and a second metal layer disposed on the composite layer the second surface side; wherein the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and , both the first metal layer and the second metal layer are in contact with the conductive connector.
本申请还提供了一种电极极片的制备方法，包括：提供复合层，所述复合层包括相对的第一表面及第二表面；在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；在所述贯通孔内设置导电连接件；及在所述复合层的所述第一表面侧设置第一金属层及在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。The present application also provides a method for preparing an electrode sheet, including: providing a composite layer, the composite layer including opposite first surfaces and second surfaces; forming through holes on the composite layer, the through holes passing through The first surface and the second surface; a conductive connector is provided in the through hole; and a first metal layer is provided on the first surface side of the composite layer and the composite layer is provided A second metal layer is provided on the second surface side to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second metal layer covers the through hole on the first surface side. The opening on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the The position of the second metal layer corresponding to the through hole is used for welding tabs.
本申请还提供了一种电极极片的制备方法，包括：提供第一金属层；在所述第一金属层上设置一复合层，所述复合层包括相对的第一表面及第二表面，所述第一金属层设置于所述第一表面；在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；在所述贯通孔内设置导电连接件；及在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述 第二金属层与所述贯通孔对应的位置用于焊接极耳。The present application also provides a method for preparing an electrode pole piece, including: providing a first metal layer; disposing a composite layer on the first metal layer, the composite layer including opposite first surfaces and second surfaces, The first metal layer is disposed on the first surface; a through hole is formed on the composite layer, and the through hole passes through the first surface and the second surface; a conductive connection is provided in the through hole and a second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, so The second metal layer covers the opening of the through hole on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the first metal layer The position of the layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for welding tabs.
本申请还提供一种电池，所述电池包括正极极片、负极极片、隔膜及电解液，其中，所述正极极片及负极极片为如前所述的电极极片，或，如前所述的电极极片的制备方法制备得到的电极极片。The present application also provides a battery, which includes a positive pole piece, a negative pole piece, a separator, and an electrolyte, wherein the positive pole piece and the negative pole piece are the electrode pole pieces as described above, or, as before The electrode pole piece prepared by the preparation method of the electrode pole piece.
本申请还提供一种电子设备，包括电池盖及收容于所述电池盖内的如前所述的电池。The present application also provides an electronic device, including a battery cover and the aforementioned battery contained in the battery cover.
附图说明Description of drawings
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.
图1是本申请第一实施例提供的一种电极极片的俯视结构示意图。FIG. 1 is a schematic top view of an electrode sheet provided in the first embodiment of the present application.
图2是本申请第一实施例提供的一种电极极片的分解结构示意图。Fig. 2 is a schematic diagram of an exploded structure of an electrode sheet provided in the first embodiment of the present application.
图3是图1的电极极片沿III-III的剖视结构示意图。FIG. 3 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 1 along III-III.
图4是本申请第一实施例提供的另一种电极极片的俯视结构示意图。FIG. 4 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
图5是图4的电极极片沿V-V的剖视结构示意图。FIG. 5 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 4 along V-V.
图6是本申请第一实施例提供的另一种电极极片的俯视结构示意图。FIG. 6 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
图7是本申请第一实施例提供的又一种电极极片的俯视结构示意图。FIG. 7 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
图8是图7的电极极片沿VIII-VIII的剖视结构示意图。FIG. 8 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 7 along VIII-VIII.
图9是本申请第一实施例提供的又一种电极极片的俯视结构示意图。FIG. 9 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
图10是图7的电极极片沿X-X的剖视结构示意图。FIG. 10 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 7 along X-X.
图11是本申请第一实施例提供的又一种电极极片的俯视结构示意图。Fig. 11 is a schematic top view of another electrode sheet provided in the first embodiment of the present application.
图12是图7的电极极片沿XII-XII的剖视结构示意图。FIG. 12 is a schematic cross-sectional structure diagram of the electrode pole piece of FIG. 7 along XII-XII.
图13是本申请另一实施例提供的一种电极极片的制备方法的流程示意图。Fig. 13 is a schematic flowchart of a method for preparing an electrode sheet provided by another embodiment of the present application.
图14是本申请另一实施例提供的另一种电极极片的制备方法的流程示意图。Fig. 14 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
图15是本申请另一实施例提供的又一种电极极片的制备方法的流程示意图。Fig. 15 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
图16是本申请另一实施例提供的又一种电极极片的制备方法的流程示意图。Fig. 16 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
图17是本申请另一实施例提供的又一种电极极片的制备方法的流程示意图。Fig. 17 is a schematic flow chart of another method for preparing an electrode sheet provided by another embodiment of the present application.
图18是本申请另一实施例提供的又一种电极极片的制备方法的流程示意图。Fig. 18 is a schematic flowchart of another method for preparing an electrode sheet provided by another embodiment of the present application.
图19是本申请又一实施例提供的一种电池的结构示意图。Fig. 19 is a schematic structural diagram of a battery provided by another embodiment of the present application.
图20是本申请又一实施例提供的一种电池的电极组件的结构示意图。Fig. 20 is a schematic structural view of an electrode assembly of a battery provided in another embodiment of the present application.
图21是本申请又一实施例提供的电子设备的俯视结构示意图。Fig. 21 is a schematic top view structural diagram of an electronic device provided by another embodiment of the present application.
具体实施方式Detailed ways
第一方面，本申请提供一种电极极片，所述电极极片包括：In the first aspect, the present application provides an electrode pole piece, the electrode pole piece comprising:
复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；A composite layer, including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the second surface;
导电连接件，设置于所述贯通孔内；a conductive connector disposed in the through hole;
第一金属层，设置于所述复合层的所述第一表面侧；及a first metal layer disposed on the first surface side of the composite layer; and
第二金属层，设置于所述复合层的所述第二表面侧；a second metal layer disposed on the second surface side of the composite layer;
其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第 一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。Wherein, the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first Both the metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for Solder the tabs.
其中，所述电极极片还包括设置于所述第一金属层远离所述复合层的表面侧的第一活性材料层，及设置于所述第二金属层远离所述复合层的表面侧的第二活性材料层；其中，所述第一活性材料层上与所述贯通孔对应的位置设置第一开窗，以使所述第一金属层部分暴露于所述第一开窗。Wherein, the electrode tab further includes a first active material layer disposed on the surface side of the first metal layer away from the composite layer, and a layer of active material disposed on the surface side of the second metal layer away from the composite layer. The second active material layer; wherein, a first opening is provided on the first active material layer at a position corresponding to the through hole, so that the first metal layer is partially exposed to the first opening.
其中，所述贯通孔位于所述复合层的延伸方向的一端；所述第二活性材料层上与所述贯通孔对应的位置设置第二开窗，以使所述第二金属层部分暴露于所述第二开窗；Wherein, the through hole is located at one end of the extension direction of the composite layer; a second window is set on the second active material layer corresponding to the through hole, so that the second metal layer is partially exposed to said second fenestration;
所述第一金属层暴露于所述第一开窗的部分和/或所述第二金属层暴露于所述第二开窗的部分用于焊接端极耳。The part of the first metal layer exposed to the first window and/or the part of the second metal layer exposed to the second window is used for soldering terminal lugs.
其中，所述贯通孔位于所述复合层的延伸方向的中间位置且位于所述复合层的宽方向的一侧边缘；所述第二活性材料层完全覆盖所述第二金属层；所述第一金属层暴露于所述第一开窗的部分用于焊接中极耳。Wherein, the through hole is located in the middle of the extending direction of the composite layer and is located at one side edge of the composite layer in the width direction; the second active material layer completely covers the second metal layer; the second active material layer completely covers the second metal layer; The part of a metal layer exposed to the first window is used for welding the tab.
其中，所述电极极片用于焊接多个极耳，所述贯通孔位于所述复合层的延伸方向的中间位置且位于所述复合层的宽方向的一侧边缘，所述贯通孔的数量为多个，所述第一活性材料层上与各所述贯通孔对应的位置均设置第一开窗，以使所述第一金属层部分暴露于多个所述第一开窗；所述第二活性材料层完全覆盖所述第二金属层；所述第一金属层暴露于多个所述第一开窗的部分用于对应焊接多个极耳。Wherein, the electrode pole piece is used for welding a plurality of tabs, the through hole is located in the middle of the extension direction of the composite layer and is located on one side edge of the composite layer in the width direction, and the number of the through holes is There are a plurality of first openings on the first active material layer corresponding to each of the through holes, so that the first metal layer is partially exposed to the plurality of first openings; The second active material layer completely covers the second metal layer; the parts of the first metal layer exposed to the plurality of first openings are used for correspondingly welding a plurality of tabs.
其中，所述导电连接件为沉积金属；所述第一金属层和所述第二金属层中的至少一个与所述导电连接件为一体结构。Wherein, the conductive connector is deposited metal; at least one of the first metal layer and the second metal layer is integrated with the conductive connector.
其中，所述导电连接件为固化的包含导电粒子的导电膏体，或，所述导电连接件为金属片。Wherein, the conductive connector is a solidified conductive paste containing conductive particles, or the conductive connector is a metal sheet.
其中，所述复合层包括聚对苯二甲酸亚乙酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、聚醚醚酮、聚酰亚胺、聚酰胺、聚乙二醇、聚酰胺酰亚胺、聚碳酸酯、环状聚烯烃、聚苯硫醚、聚乙酸乙烯酯、聚四氟乙烯，聚亚甲基萘、聚偏二氟乙烯，聚萘二甲酸亚乙酯、聚碳酸亚丙酯、聚(偏二氟乙烯-六氟丙烯)、聚(偏二氟乙烯-共-三氟氯乙烯)、有机硅、维尼纶、聚丙烯、聚乙烯、聚氯乙烯、聚苯乙烯、聚醚腈、聚氨酯、聚苯醚、聚酯、聚砜及其衍生物、羧甲基纤维素钠、丁苯橡胶、氟化橡胶、聚乙烯醇、聚偏氟乙烯中的一种或多种。Wherein, the composite layer includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene Diol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polynaphthalene Ethyl ester, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, polyethylene, polychlorinated Ethylene, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene rubber, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride one or more of .
其中，所述第一金属层和所述第二金属层通过沉积工艺设置于所述复合层的所述第一表面侧及所述第二表面侧，或，所述第一金属层和所述第二金属层为金属箔且通过粘胶粘结于所述复合层的所述第一表面侧及所述第二表面侧。Wherein, the first metal layer and the second metal layer are disposed on the first surface side and the second surface side of the composite layer through a deposition process, or, the first metal layer and the The second metal layer is a metal foil and is bonded to the first surface side and the second surface side of the composite layer by adhesive.
其中，所述复合层包括导电剂、粘结剂、活性物质以及金属粉末；其中，所述导电剂为碳纳米管、石墨烯、导电石墨、炭黑、碳纤维、石墨、导电陶瓷粉、复合导电材料中的至少一种；所述粘结剂选自聚偏二氟乙烯、偏氟乙烯-氟化烯烃的共聚物、聚四氟乙烯、羧甲基纤维素钠、丁苯橡胶、聚胺酯、氟化橡胶、聚乙烯醇、聚偏氟乙烯、聚酰胺中的一种或几种；所述活性物质为磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、富锂锰基材料、镍钴铝酸锂、氧化亚硅、氧化锡、钛酸锂中的至少一种；所述金属粉末为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金的粉末中的至少一种。Wherein, the composite layer includes conductive agent, binder, active material and metal powder; wherein, the conductive agent is carbon nanotube, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive At least one of the materials; the binder is selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorine One or more of chemical rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide; the active material is lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium cobaltate, manganese At least one of lithium oxide, lithium nickelate, lithium nickel-cobalt manganate, lithium-rich manganese-based materials, lithium nickel-cobalt aluminate, silicon oxide, tin oxide, lithium titanate; the metal powder is aluminum, copper, At least one of powders of nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or alloys thereof.
其中，所述金属粉末、所述粘结剂及所述导电剂的质量比为(50-70):(5-35):(10-20)。Wherein, the mass ratio of the metal powder, the binder and the conductive agent is (50-70):(5-35):(10-20).
其中，所述复合层复用作粘胶直接与所述第一金属层和所述第二金属层相粘结。Wherein, the composite layer is reused as an adhesive to directly bond with the first metal layer and the second metal layer.
其中，所述复合层的厚度为1微米至40微米；所述第一金属层和所述第二金属层的厚度均为1纳米至10微米。Wherein, the thickness of the composite layer is 1 micrometer to 40 micrometers; the thickness of the first metal layer and the second metal layer are both 1 nanometer to 10 micrometers.
第二方面，本申请提供一种复合集流体，其包括：In a second aspect, the present application provides a composite current collector, which includes:
复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；A composite layer, including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the second surface;
导电连接件，设置于所述贯通孔内；a conductive connector disposed in the through hole;
第一金属层，设置于所述复合层的所述第一表面侧；及a first metal layer disposed on the first surface side of the composite layer; and
第二金属层，设置于所述复合层的所述第二表面侧；a second metal layer disposed on the second surface side of the composite layer;
其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔 于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触。Wherein, the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first Both the metal layer and the second metal layer are in contact with the conductive connector.
其中，所述复合层包括聚对苯二甲酸亚乙酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、聚醚醚酮、聚酰亚胺、聚酰胺、聚乙二醇、聚酰胺酰亚胺、聚碳酸酯、环状聚烯烃、聚苯硫醚、聚乙酸乙烯酯、聚四氟乙烯，聚亚甲基萘、聚偏二氟乙烯，聚萘二甲酸亚乙酯、聚碳酸亚丙酯、聚(偏二氟乙烯-六氟丙烯)、聚(偏二氟乙烯-共-三氟氯乙烯)、有机硅、维尼纶、聚丙烯、聚乙烯、聚氯乙烯、聚苯乙烯、聚醚腈、聚氨酯、聚苯醚、聚酯、聚砜及其衍生物、羧甲基纤维素钠、丁苯橡胶、氟化橡胶、聚乙烯醇、聚偏氟乙烯中的一种或多种；Wherein, the composite layer includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene Diol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polynaphthalene Ethyl ester, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, polyethylene, polychlorinated Ethylene, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene rubber, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride one or more of
或者，or,
所述复合层包括导电剂、粘结剂、活性物质以及金属粉末；其中，所述导电剂为碳纳米管、石墨烯、导电石墨、炭黑、碳纤维、石墨、导电陶瓷粉、复合导电材料中的至少一种；所述粘结剂选自聚偏二氟乙烯、偏氟乙烯-氟化烯烃的共聚物、聚四氟乙烯、羧甲基纤维素钠、丁苯橡胶、聚胺酯、氟化橡胶、聚乙烯醇、聚偏氟乙烯、聚酰胺中的一种或几种；所述活性物质为磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、富锂锰基材料、镍钴铝酸锂、氧化亚硅、氧化锡、钛酸锂中的至少一种；所述金属粉末为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金的粉末中的至少一种。The composite layer includes conductive agent, binder, active material and metal powder; wherein, the conductive agent is carbon nanotube, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material At least one of; the binder is selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber , polyvinyl alcohol, polyvinylidene fluoride, polyamide; the active material is lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium cobaltate, lithium manganate , lithium nickelate, lithium nickel-cobalt manganate, lithium-rich manganese-based materials, lithium-nickel-cobalt-aluminate, silicon oxide, tin oxide, lithium titanate; the metal powder is aluminum, copper, nickel, At least one of powders of copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or alloys thereof.
第三方面，本申请提供一种电极极片的制备方法，其包括：In a third aspect, the present application provides a method for preparing an electrode sheet, which includes:
提供复合层，所述复合层包括相对的第一表面及第二表面；providing a composite layer comprising opposing first and second surfaces;
在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；forming a through hole on the composite layer, the through hole passing through the first surface and the second surface;
在所述贯通孔内设置导电连接件；及providing a conductive connector in the through hole; and
在所述复合层的所述第一表面侧设置第一金属层及在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。A first metal layer is provided on the first surface side of the composite layer and a second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein the first metal layer covers The opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first metal layer and the second metal layer All are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for soldering tabs.
其中，所述第一金属层和所述第二金属层通过蒸镀、气相沉积、化学沉积、磁控溅射、化学镀中的至少一种工艺形成于所述复合层的相对两侧表面，所述导电连接件与所述第一金属层和所述第二金属层中的至少一个为同一工艺形成；或，所述第一金属层和所述第二金属层通过胶粘剂分别粘结于所述复合层的相对两侧表面。Wherein, the first metal layer and the second metal layer are formed on opposite sides of the composite layer by at least one process of evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating, The conductive connector is formed in the same process as at least one of the first metal layer and the second metal layer; or, the first metal layer and the second metal layer are respectively bonded to the The opposite side surfaces of the composite layer.
第四方面，本申请提供一种电极极片的制备方法，其包括：In a fourth aspect, the present application provides a method for preparing an electrode sheet, which includes:
提供第一金属层；providing a first metal layer;
在所述第一金属层上设置一复合层，所述复合层包括相对的第一表面及第二表面，所述第一金属层设置于所述第一表面；A composite layer is disposed on the first metal layer, the composite layer includes opposite first surfaces and second surfaces, and the first metal layer is disposed on the first surface;
在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；forming a through hole on the composite layer, the through hole passing through the first surface and the second surface;
在所述贯通孔内设置导电连接件；及providing a conductive connector in the through hole; and
在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。A second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second The metal layer covers the opening of the through hole on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the first metal layer and the The position corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for welding tabs.
第五方面，本申请提供一种电池，所述电池包括正极极片、负极极片、隔膜及电解液，其中，所述正极极片及负极极片为第一方面任一种所述的电极极片，或，如第三方面、第四方面任一种所述的电极极片的制备方法制备得到的电极极片。In a fifth aspect, the present application provides a battery, which includes a positive pole piece, a negative pole piece, a separator, and an electrolyte, wherein the positive pole piece and the negative pole piece are any one of the electrodes described in the first aspect A pole piece, or an electrode pole piece prepared by the electrode pole piece preparation method described in any one of the third aspect and the fourth aspect.
第六方面，本申请提供一种电子设备，其包括电池盖及收容于所述电池盖内的如第五方面所述的电池。In a sixth aspect, the present application provides an electronic device, which includes a battery cover and the battery according to the fifth aspect contained in the battery cover.
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
本申请的说明书和权利要求书及上述附图中的术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其他步骤或单元。The terms "comprising" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or devices.
需要说明的是，为便于说明，在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。It should be noted that, for ease of description, in the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, detailed descriptions of the same components are omitted.
本申请一实施例提供一种电极极片，包括：复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；导电连接件，设置于所述贯通孔内；第一金属层，设置于所述复合层的所述第一表面侧；及第二金属层，设置于所述复合层的所述第二表面侧；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。An embodiment of the present application provides an electrode sheet, including: a composite layer, including a first surface and a second surface opposite to each other, the composite layer is provided with a through hole, and the through hole passes through the first surface and the second surface. the second surface; a conductive connector disposed in the through hole; a first metal layer disposed on the first surface side of the composite layer; and a second metal layer disposed on the composite layer The second surface side; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second metal layer covers the opening of the through hole on the second surface side, Moreover, both the first metal layer and the second metal layer are in contact with the conductive connector; the position corresponding to the first metal layer and the through hole or the second metal layer is in contact with the through hole The positions corresponding to the holes are used for welding tabs.
本申请实施例中的电极极片在所述复合层上设置贯通孔，并在贯通孔内设置导电连接件，且使所述复合层相对两侧的第一金属层与第二金属层分别覆盖所述贯通孔于所述第一表面侧及所述第二表面侧的开口且均与所述导电连接件相接触，从而使复合层相对两侧的第一金属层与第二金属层相导通，从而在焊接极耳时，只需要将极耳焊接在复合层两侧的第一金属层与第二金属层的一层上，即可实现极耳与第一金属层与第二金属层的同时导通；并且，所述复合层相对两侧的第一金属层与第二金属层分别覆盖所述贯通孔于所述第一表面侧及所述第二表面侧的开口，从而，所述电极极片的外观较为平整，从而通电后电流分布较为均匀，具有较高的安全性；另外，本申请的电极极片采用复合集流体的形式设置，也具有较高的安全性。In the electrode sheet in the embodiment of the present application, a through hole is provided on the composite layer, and a conductive connector is provided in the through hole, and the first metal layer and the second metal layer on the opposite sides of the composite layer are respectively covered. The through holes are opened on the first surface side and the second surface side and both are in contact with the conductive connector, so that the first metal layer and the second metal layer on opposite sides of the composite layer are electrically connected. Therefore, when welding the tabs, only the tabs need to be welded on one layer of the first metal layer and the second metal layer on both sides of the composite layer, and the connection between the tabs and the first metal layer and the second metal layer can be realized. and the first metal layer and the second metal layer on opposite sides of the composite layer respectively cover the openings of the through hole on the first surface side and the second surface side, so that the The appearance of the above-mentioned electrode pole piece is relatively smooth, so that the current distribution is relatively uniform after electrification, and has high safety; in addition, the electrode pole piece of the present application is set in the form of a composite current collector, which also has high safety.
现有技术中有采用分叉式极耳连接两侧的金属层，即通过将极耳分成两半来分别导通极片的两边的金属层，其制作工艺较为复杂；相比于现有技术的分叉式极耳，本申请的电极极片通过复合层内部的导电连接件将第一及第二金属层导通，从而只需要在一侧的金属层焊接极耳，制作工艺相对较为简单。In the prior art, bifurcated tabs are used to connect the metal layers on both sides, that is, the metal layers on both sides of the pole piece are respectively conducted by dividing the tabs into two halves. The manufacturing process is relatively complicated; compared with the prior art The bifurcated tabs of the present application connect the first and second metal layers through the conductive connector inside the composite layer, so that only one side of the metal layer needs to be welded with tabs, and the manufacturing process is relatively simple. .
下面将结合附图，对本申请实施例中的技术方案进行描述。The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
请参阅图1至图12，本申请第一实施例提供的一种电极极片100。Please refer to FIG. 1 to FIG. 12 , an electrode pad 100 provided in the first embodiment of the present application.
本申请中，请参阅图1至图5，所述电极极片100包括复合集流体10及活性材料层20；所述复合集流体10包括复合层11及设置于所述复合层11相对两侧的第一金属层12与第二金属层13。In this application, please refer to FIG. 1 to FIG. 5, the electrode pole piece 100 includes a composite current collector 10 and an active material layer 20; the composite current collector 10 includes a composite layer 11 and is disposed on opposite sides of the composite layer 11 The first metal layer 12 and the second metal layer 13.
在一些实施例中，所述第一金属层12与所述第二金属层13可以为压延方式形成的金属箔，也可以为通过电镀、化学镀等方式形成的沉积金属层，还可以为其他方式形成的导电金属层。In some embodiments, the first metal layer 12 and the second metal layer 13 can be metal foils formed by rolling, or deposited metal layers formed by electroplating, electroless plating, etc., or other metal layers. Formed conductive metal layer.
在一些实施例中，所述第一金属层12与所述第二金属层13可以为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金中的至少一种。In some embodiments, the first metal layer 12 and the second metal layer 13 can be aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or alloys thereof at least one of .
在一些实施例中，所述第一金属层12的材质与所述第二金属层的材质可以不同，例如，所述第一金属层12的材质为铜，所述第二金属层13的材质为铝；在另一些实施例中，所述第一金属层12的材质与所述第二金属层的材质也可以相同，例如，所述第一金属层12的材质与所述第二金属层的材质均为铜或均为铝。In some embodiments, the material of the first metal layer 12 and the material of the second metal layer can be different, for example, the material of the first metal layer 12 is copper, and the material of the second metal layer 13 Aluminum; in some other embodiments, the material of the first metal layer 12 and the material of the second metal layer can also be the same, for example, the material of the first metal layer 12 and the material of the second metal layer The materials are all copper or all aluminum.
可选地，当所述电极极片100用作正极极片时，所述第一金属层12及所述第二金属层13可以采用金属铝或铝合金材料制成；当所述电极极片100用作负极极片时，所述第一金属层12及所述第二金属层13可以采用金属铜或铜合金材料制成。Optionally, when the electrode pole piece 100 is used as a positive pole piece, the first metal layer 12 and the second metal layer 13 can be made of metal aluminum or aluminum alloy; when the electrode pole piece When 100 is used as a negative electrode sheet, the first metal layer 12 and the second metal layer 13 can be made of copper or copper alloy materials.
在一些实施例中，所述复合层11包括聚对苯二甲酸亚乙酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、聚醚醚酮、聚酰亚胺、聚酰胺、聚乙二醇、聚酰胺酰亚胺、聚碳酸酯、环状聚烯烃、聚苯硫醚、聚乙酸乙烯酯、聚四氟乙烯，聚亚甲基萘、聚偏二氟乙烯，聚萘二甲酸亚乙酯、聚碳酸亚丙酯、聚(偏二氟乙烯-六氟丙烯)、聚(偏二氟乙烯-共-三氟氯乙烯)、有机硅、维尼纶、聚丙烯、聚乙烯、聚氯乙烯、聚苯乙烯、聚醚腈、聚氨酯、聚苯醚、聚酯、聚砜及其衍生物、羧甲基纤维素钠、丁苯橡胶、氟化橡胶、聚乙烯醇、聚偏氟乙烯等中的一种或多种。其中，由于所述第一金属层12及所述第二金属层13采用金属材料制成，所述复合层11以高分子材料为主制成，一般地，高分子材料的熔点低于金属材料的熔点，从而，随着电池温度的上升，当电池温度达到所述复合层11的熔点时，所述复合层11发生熔融，从而造成极片破损，由此可以切断电流，从而改善电池的安全问题，并且，当锂离子电池受到外界的物理冲击时，尤其是受到尖锐物体或者重物冲击时，复合集流体两侧的金属层发生断裂时，中间的复合层能够凭借自身的延展性，阻止断裂面刺破隔膜接触到其他地方造成短路，从而还能解决锂离子电池受到外界物理冲击后，容易造成内部短路等安全问题。可选地，所述第一金属层12及第二金属层13通过镀覆等方式形成于所述复合层11的表面，也即，所述第一金属层12与所述第二金属层13为沉积方式，如化学沉积、电镀沉积、物理气相沉积、磁控溅射沉积等，形成的沉积金属层。又可选地，所述第一金属层12及第二金属层13为金属箔，通过粘胶粘合于所述复合层11的表面。In some embodiments, the composite layer 11 includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, Polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, Polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, Polyethylene, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene rubber, fluorinated rubber, polyvinyl alcohol, One or more of polyvinylidene fluoride, etc. Wherein, since the first metal layer 12 and the second metal layer 13 are made of metal materials, the composite layer 11 is mainly made of polymer materials. Generally, the melting point of polymer materials is lower than that of metal materials. Therefore, as the temperature of the battery rises, when the temperature of the battery reaches the melting point of the composite layer 11, the composite layer 11 will melt, thereby causing damage to the pole piece, thereby cutting off the current, thereby improving the safety of the battery problem, and when the lithium-ion battery is subjected to external physical impact, especially when it is impacted by sharp objects or heavy objects, when the metal layers on both sides of the composite current collector are broken, the middle composite layer can rely on its own ductility. The fracture surface pierces the diaphragm and contacts other places to cause a short circuit, which can also solve safety problems such as internal short circuits that are easily caused by the lithium-ion battery after being subjected to external physical shocks. Optionally, the first metal layer 12 and the second metal layer 13 are formed on the surface of the composite layer 11 by plating or the like, that is, the first metal layer 12 and the second metal layer 13 It is a deposited metal layer formed by deposition methods, such as chemical deposition, electroplating deposition, physical vapor deposition, magnetron sputtering deposition, etc. Alternatively, the first metal layer 12 and the second metal layer 13 are metal foils, which are bonded to the surface of the composite layer 11 by adhesive.
在另一些实施例中，所述复合层11包括金属粉末及粘结剂，所述金属粉末可以为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金的粉末等中的至少一种，所述粘结剂可以为聚偏二氟乙烯、偏氟乙烯-氟化烯烃的共聚物、聚四氟乙烯、羧甲基纤维素钠、丁苯橡胶、聚胺酯、氟化橡胶、聚乙烯醇、聚偏氟乙烯、聚酰胺等中的一种或几种，其中，本实施例中，粘结剂包裹金属粉末，从而使所述复合层11也具有较好的延展性及较低的熔点，进而也能改善电池的安全问题，另外，采用包含金属粉末的复合层11还能够使所述复合集流体10的接触电阻较小进而使所述复合集流体10的功率提升；所述金属粉末与所述粘结剂的质量比可以视情况设置，一般情况下，粘结剂的量不宜过多，根据实验情况来看，粘结剂过多时，对电池的循环性能有所影响，可选地，所述金属粉与粘结剂的质量比为50-70:5-35。可选地，所述复合层11还可以包括导电剂，所述导电剂可以为碳纳米管、石墨烯、导电石墨、炭黑、碳纤维、石墨、导电陶瓷粉、复合导电材料等中的至少一种，导电剂能够提高电池的性能，其中，导电剂的量不宜过多，以避免对极片电位的影响，可选地，所述金属粉与导电剂的质量比为50-70:10-20。可选地，所述复合层11还可以包括活性物质，活性物质的加入也能够提高电池的性能，所述活性物质可以为磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、富锂锰基材料、镍钴铝酸锂、氧化亚硅、氧化锡、钛酸锂等中的至少一种。可以理解，形成所述复合层11的材料可以通过涂覆等形成于所述第一金属层12或第二金属层13的表面并固化形成所述复合层11，可选地，所述第一金属层12及所述第二金属层13可以为压延、电解等方式形成的金属箔，所述复合层11可以复用作粘胶将所述第一金属层12及第二金属层13直接粘合于所述复合层11的表面，又可选地，所述第一金属层12可以为压延、电解等方式形成的金属箔，所述复合层11可以复用作粘胶将所述第一金属层12直接粘合于所述复合层11的表面，所述第二金属层13可以为沉积方式形成于所述复合层11的表面。In other embodiments, the composite layer 11 includes metal powder and a binder, and the metal powder can be aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or At least one of its alloy powder, etc., the binder can be polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber , polyurethane, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide, etc., wherein, in this embodiment, the binder wraps the metal powder, so that the composite layer 11 also has Better ductility and lower melting point can improve the safety of the battery. In addition, the use of the composite layer 11 containing metal powder can also make the contact resistance of the composite current collector 10 smaller, thereby making the composite collector The power of the fluid 10 is improved; the mass ratio of the metal powder to the binder can be set according to the situation. Generally speaking, the amount of the binder should not be too much. According to the experimental situation, when the binder is too much, the The cycle performance of the battery is affected. Optionally, the mass ratio of the metal powder to the binder is 50-70:5-35. Optionally, the composite layer 11 may also include a conductive agent, and the conductive agent may be at least one of carbon nanotubes, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material, etc. One, the conductive agent can improve the performance of the battery, wherein the amount of the conductive agent should not be too much to avoid the impact on the potential of the pole piece, optionally, the mass ratio of the metal powder to the conductive agent is 50-70:10- 20. Optionally, the composite layer 11 may also include an active material, and the addition of the active material may also improve the performance of the battery. The active material may be lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, At least one of lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, silicon oxide, tin oxide, lithium titanate, and the like. It can be understood that the material forming the composite layer 11 can be formed on the surface of the first metal layer 12 or the second metal layer 13 by coating etc. and cured to form the composite layer 11. Optionally, the first The metal layer 12 and the second metal layer 13 can be metal foils formed by calendering, electrolysis, etc., and the composite layer 11 can be reused as an adhesive to directly adhere the first metal layer 12 and the second metal layer 13. Compatible with the surface of the composite layer 11, and optionally, the first metal layer 12 can be a metal foil formed by calendering, electrolysis, etc., and the composite layer 11 can be reused as an adhesive to bond the first The metal layer 12 is directly bonded to the surface of the composite layer 11 , and the second metal layer 13 may be formed on the surface of the composite layer 11 by deposition.
在一些实施例中，所述复合层11的厚度为1微米至40微米；所述第一金属层12及所述第二金属 层13的厚度均为1纳米至10微米；其中，如果所述复合层11的厚度太小，则会对所述复合集流体10的支撑不够，如果所述复合层11的厚度太大，则会使所述复合集流体10太厚重，不利于电池的轻薄化；如果所述第一金属层12及所述第二金属层13的厚度太小，则导电能力不足，内阻大，如果所述第一金属层12及所述第二金属层13的厚度太大，则一方面会使所述复合集流体10太厚重，不利于电池的轻薄化，另一方面还会影响电池能量密度。In some embodiments, the thickness of the composite layer 11 is 1 micron to 40 microns; the thickness of the first metal layer 12 and the second metal layer 13 are both 1 nanometer to 10 microns; wherein, if the If the thickness of the composite layer 11 is too small, the support for the composite current collector 10 will not be sufficient; if the thickness of the composite layer 11 is too large, the composite current collector 10 will be too thick and heavy, which is not conducive to the thinning of the battery ; If the thickness of the first metal layer 12 and the second metal layer 13 is too small, then the conductivity is insufficient and the internal resistance is large, if the thickness of the first metal layer 12 and the second metal layer 13 is too large Larger, on the one hand, the composite current collector 10 will be too thick, which is not conducive to the thinning of the battery, and on the other hand, it will also affect the energy density of the battery.
在一优选实施例中，所述复合层11的厚度为3微米至20微米；所述第一金属层12及所述第二金属层13的厚度均为100纳米至1微米。In a preferred embodiment, the composite layer 11 has a thickness of 3 microns to 20 microns; the first metal layer 12 and the second metal layer 13 have a thickness of 100 nanometers to 1 micron.
本申请中，所述复合层11包括相对的第一表面101及第二表面102，所述复合层11上设置有贯通孔111，所述贯通孔111贯通所述第一表面101及所述第二表面102，所述电极极片100与所述贯通孔111对应的位置用于焊接极耳。其中，所述贯通孔111可以为矩形、圆形、椭圆形、扇形、多边形或者不规则图形等各种形状，并不限制本申请图示所示；所述贯通孔111可以设置在所述复合层11的延伸方向上的任何位置，例如，视电池的需要，如图4及图6所示，所述贯通孔111可以位于所述复合层11的延伸方向的端部，具体地，图4中的贯通孔111不贯穿所述复合层11的宽方向，图6中的贯通孔111贯穿所述复合层11的宽方向；又如图7至图10所示，所述贯通孔111也可以位于所述复合层11的延伸方向的中间位置且位于所述复合层11的宽方向的一侧边缘。另外，所述贯通孔111的数量可以为一个或多个，如图9至图10所示，所述贯通孔111的数量为多个。本申请中，可以理解，电极极片100为长片状，所述复合层11的延伸方向即为电极极片100的长方向，进而，所述复合层11的与所述第一表面101及所述第二表面102相平行且与所述延伸方向相垂直的方向为所述电极极片100的宽方向。In the present application, the composite layer 11 includes opposite first surface 101 and second surface 102, and the composite layer 11 is provided with a through hole 111, and the through hole 111 passes through the first surface 101 and the second surface. On the two surfaces 102, the positions of the electrode tabs 100 corresponding to the through holes 111 are used for welding tabs. Wherein, the through hole 111 can be in various shapes such as rectangle, circle, ellipse, sector, polygon or irregular figure, and is not limited to what is shown in the diagram of this application; the through hole 111 can be arranged in the compound Any position in the direction of extension of the layer 11, for example, depending on the needs of the battery, as shown in Figure 4 and Figure 6, the through hole 111 can be located at the end of the direction of extension of the composite layer 11, specifically, Figure 4 The through hole 111 in the composite layer 11 does not pass through the width direction of the composite layer 11, and the through hole 111 in Fig. 6 runs through the width direction of the composite layer 11; It is located in the middle of the extending direction of the composite layer 11 and is located at one side edge of the composite layer 11 in the width direction. In addition, the number of the through holes 111 may be one or more, as shown in FIG. 9 to FIG. 10 , the number of the through holes 111 is multiple. In the present application, it can be understood that the electrode pole piece 100 is in the shape of a long sheet, and the extending direction of the composite layer 11 is the long direction of the electrode pole piece 100, and further, the composite layer 11 and the first surface 101 and the The direction parallel to the second surface 102 and perpendicular to the extending direction is the width direction of the electrode sheet 100 .
本申请中，请参阅图1至图3所述贯通孔111内设置有导电连接件14。所述第一金属层12覆盖所述贯通孔111于所述第一表面101侧的开口，所述第二金属层13覆盖所述贯通孔111于所述第二表面102侧的开口，且，所述第一金属层12及所述第二金属层13均与所述导电连接件14相接触。所述第一金属层12与所述贯通孔111对应的位置或所述第二金属层13与所述贯通孔111对应的位置用于焊接极耳，其中，直接在所述第一金属层12与所述贯通孔111对应的位置或所述第二金属层13与所述贯通孔111对应的位置焊接极耳，可以使所述极耳与所述第一金属层12及所述第二金属层13之间的导电性能更好，也使电池的安全性能更好。In this application, referring to FIGS. 1 to 3 , the through hole 111 is provided with a conductive connector 14 . The first metal layer 12 covers the opening of the through hole 111 on the first surface 101 side, the second metal layer 13 covers the opening of the through hole 111 on the second surface 102 side, and, Both the first metal layer 12 and the second metal layer 13 are in contact with the conductive connector 14 . The position of the first metal layer 12 corresponding to the through hole 111 or the position of the second metal layer 13 corresponding to the through hole 111 is used for welding tabs, wherein, directly on the first metal layer 12 The position corresponding to the through hole 111 or the position of the second metal layer 13 corresponding to the through hole 111 is welded with tabs, so that the tabs can be connected to the first metal layer 12 and the second metal layer 12 . The electrical conductivity between the layers 13 is better, which also makes the safety performance of the battery better.
其中，所述贯通孔111可以倾斜或垂直贯通所述复合层11；优选地，所述贯通孔111垂直贯通所述复合层11。Wherein, the through hole 111 may penetrate the composite layer 11 obliquely or vertically; preferably, the through hole 111 vertically penetrates the composite layer 11 .
在一些实施例中，所述导电连接件14可以为沉积金属块，所述沉积金属块可以通过如化学沉积、电镀沉积、物理气相沉积、磁控溅射沉积等方式形成；所述导电连接件14可以填满所述贯通孔111；当所述第一金属层12及所述第二金属层13中的至少一个也通过沉积工艺形成时，所述第一金属层12及所述第二金属层13中的至少一个可以与所述导电连接件14在同一个工艺下同时形成，从而为材质相同的一体结构。In some embodiments, the conductive connector 14 can be a deposited metal block, and the deposited metal block can be formed by methods such as chemical deposition, electroplating deposition, physical vapor deposition, magnetron sputtering deposition, etc.; the conductive connector 14 can fill up the through hole 111; when at least one of the first metal layer 12 and the second metal layer 13 is also formed by a deposition process, the first metal layer 12 and the second metal layer At least one of the layers 13 can be formed simultaneously with the conductive connector 14 in the same process, so as to be an integral structure with the same material.
在另一些实施例中，所述导电连接件14也可以为固化的包含导电粒子的导电膏体，也即，可以通过在所述贯通孔111内填充包含导电粒子的导电膏体并固化所述导电膏体得到所述导电连接件14；所述导电连接件14可以填满所述贯通孔111。In some other embodiments, the conductive connector 14 can also be a cured conductive paste containing conductive particles, that is, the conductive paste containing conductive particles can be filled in the through hole 111 and cured. The conductive paste obtains the conductive connector 14 ; the conductive connector 14 can fill the through hole 111 .
在又一些实施例中，所述导电连接件14还可以为直接放置于所述贯通孔111内的金属片，所述金属片的形状及尺寸与所述贯通孔111的形状及尺寸大致相同或完全相同，从而所述金属片能够正好收容于所述贯通孔111内，此使所述复合集流体10的整体稳定性较好；当然，可以理解，所述金属片的形 状及尺寸与所述贯通孔111的形状及尺寸大致相同或完全相同为本申请的较优实施例，但是所述金属片的形状及尺寸与所述贯通孔111的形状及尺寸不相同也属于本申请的保护范围；另外，所述金属片的材质优选与所述第一金属层12及第二金属层13的材质相同，以使所述金属片与所述第一金属层12及第二金属层13上的电流较为均匀，防止局部过热。In some other embodiments, the conductive connector 14 can also be a metal sheet directly placed in the through hole 111, the shape and size of the metal sheet are substantially the same as the shape and size of the through hole 111 or are exactly the same, so that the metal sheet can be just accommodated in the through hole 111, which makes the overall stability of the composite current collector 10 better; of course, it can be understood that the shape and size of the metal sheet are different from the described The shape and size of the through hole 111 are approximately the same or completely the same as the preferred embodiment of the present application, but the shape and size of the metal sheet and the shape and size of the through hole 111 are not the same and also belong to the protection scope of the present application; In addition, the material of the metal sheet is preferably the same as that of the first metal layer 12 and the second metal layer 13, so that the current on the metal sheet and the first metal layer 12 and the second metal layer 13 More uniform, to prevent local overheating.
可以理解，一般来说，所述导电连接件14的厚度与所述复合层11的厚度相同，以使所述第一金属层12及所述第二金属层13能够与所述导电连接件14更好地接触，并使所述复合集流体10的表面较为平整；当然，可以理解，所述导电连接件14的厚度与所述复合层11的厚度相同为本申请的较优实施例，但是所述导电连接件14的厚度与所述贯通孔111的厚度略大或略小如果也能实现本申请的基本功能，也属于本申请的保护范围。It can be understood that, generally speaking, the thickness of the conductive connector 14 is the same as the thickness of the composite layer 11, so that the first metal layer 12 and the second metal layer 13 can be connected with the conductive connector 14 better contact, and make the surface of the composite current collector 10 relatively flat; of course, it can be understood that the thickness of the conductive connector 14 is the same as the thickness of the composite layer 11 is a preferred embodiment of the present application, but If the thickness of the conductive connector 14 is slightly larger or smaller than the thickness of the through hole 111 and the basic functions of the application can be realized, it also belongs to the scope of protection of the application.
在一些实施例中，如图5、图8、图10及图12所示，所述电极极片100还包括设置于所述第一金属层12远离所述复合层11的表面侧的第一活性材料层15，及设置于所述第二金属层13远离所述复合层11的表面侧的第二活性材料层16。In some embodiments, as shown in FIG. 5 , FIG. 8 , FIG. 10 and FIG. 12 , the electrode pad 100 further includes a first an active material layer 15 , and a second active material layer 16 disposed on the surface side of the second metal layer 13 away from the composite layer 11 .
其中，所述第一活性材料层15及所述第二活性材料层16的材质可以根据电极极片100的极性需要设置为正极活性材料或负极活性材料；所述第一活性材料层15及所述第二活性材料层16可以通过涂覆工艺形成；其中，正极活性材料可以包括可逆地嵌入和脱嵌锂离子的至少一种锂化插层化合物，例如，包括但不限于钴酸锂、镍钴锰酸锂、镍钴铝酸锂、锰酸锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、磷酸铁锂、钛酸锂和富锂锰基材料中的一种或多种；负极活性材料可以包括任何能够电化学性地吸留、放出锂离子等金属离子的物质，例如，包括但不限于碳质材料、硅碳材料、合金材料或含锂金属的复合氧化物材料中的一种或多种。其中，所述正极活性材料及所述负极活性材料均还可以包括导电剂及粘结剂等材料；本发明对导电剂的种类不做限制，作为示例，导电剂为石墨、超导碳、乙炔黑、炭黑、科琴黑、碳点、碳纳米管、石墨烯及碳纳米纤维中一种或多种；本发明对粘结剂的种类也不做限制，作为示例，粘结剂为丁苯橡胶(SBR)、水性丙烯酸树脂(water-based acrylic resin)、羧甲基纤维素(CMC)、聚偏二氟乙烯(PVDF)、聚四氟乙烯(PTFE)、乙烯-醋酸乙烯酯共聚物(EVA)、聚乙烯醇(PVA)及聚乙烯醇缩丁醛(PVB)中的一种或多种。Wherein, the material of the first active material layer 15 and the second active material layer 16 can be set as a positive electrode active material or a negative electrode active material according to the polarity of the electrode sheet 100; The second active material layer 16 can be formed by a coating process; wherein, the positive electrode active material can include at least one lithiated intercalation compound that can reversibly intercalate and deintercalate lithium ions, for example, including but not limited to lithium cobaltate, One or more of lithium nickel cobalt manganate, lithium nickel cobalt aluminate, lithium manganate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium iron phosphate, lithium titanate and lithium-rich manganese-based materials The negative electrode active material can include any material that can electrochemically occlude and release metal ions such as lithium ions, for example, including but not limited to carbonaceous materials, silicon carbon materials, alloy materials or lithium metal-containing composite oxide materials one or more of . Wherein, both the positive electrode active material and the negative electrode active material may also include materials such as conductive agent and binder; the present invention does not limit the type of conductive agent, as examples, the conductive agent is graphite, superconducting carbon, acetylene One or more of black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers; the present invention does not limit the type of binder, as an example, the binder is Styrene rubber (SBR), water-based acrylic resin (water-based acrylic resin), carboxymethyl cellulose (CMC), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer One or more of (EVA), polyvinyl alcohol (PVA) and polyvinyl butyral (PVB).
可以理解，可以根据需要选择在所述复合集流体10上形成正极活性材料或负极活性材料，例如，如形成正极极片，则在复合集流体10上形成正极活性材料，如形成负极极片，则在复合集流体10上形成负极活性材料。It can be understood that the positive electrode active material or the negative electrode active material can be selected to be formed on the composite current collector 10 as required, for example, if a positive electrode sheet is formed, then the positive electrode active material is formed on the composite current collector 10, such as a negative electrode sheet is formed, Then the negative electrode active material is formed on the composite current collector 10 .
在一些实施例中，所述第一活性材料层15上与所述贯通孔111对应的位置设置第一开窗151，以使所述第一金属层12部分暴露于所述第一开窗151，所述第一金属层12暴露于所述第一开窗151的部分可以用于焊接极耳。In some embodiments, a first opening 151 is provided on the first active material layer 15 at a position corresponding to the through hole 111, so that the first metal layer 12 is partially exposed to the first opening 151. , the part of the first metal layer 12 exposed to the first opening 151 can be used for soldering tabs.
在一些具体实施例中，请参阅图4至图6，所述贯通孔111位于所述复合层11的延伸方向的一端，所述电极极片100与所述贯通孔111对应的位置用于焊接端极耳；所述第二活性材料层16上与所述贯通孔111对应的位置设置有第二开窗161，以使所述第二金属层13部分暴露于所述第二开窗161；所述第一金属层12暴露于所述第一开窗151的部分或所述第二金属层13暴露于所述第二开窗161的部分均可以用于焊接端极耳；也就是说，当所述电极极片100的与所述贯通孔111对应的位置用于焊接端极耳时，可以使所述第一活性材料层15及所述第二活性材料层16均避开所述电极极片100与所述贯通孔111对应的位置涂覆，如此制备工艺较为简单，另外，此种情况下，所述第一金属层12或所述第二金属层13均可以用于焊接端极耳，较为方便。In some specific embodiments, please refer to FIG. 4 to FIG. 6, the through hole 111 is located at one end of the extension direction of the composite layer 11, and the position of the electrode pad 100 corresponding to the through hole 111 is used for welding terminal ear; a second window 161 is provided on the second active material layer 16 corresponding to the through hole 111, so that the second metal layer 13 is partially exposed to the second window 161; The part of the first metal layer 12 exposed to the first opening 151 or the part of the second metal layer 13 exposed to the second opening 161 can be used for soldering terminal lugs; that is, When the position of the electrode pole piece 100 corresponding to the through hole 111 is used for welding the terminal lug, both the first active material layer 15 and the second active material layer 16 can avoid the electrodes. The position corresponding to the pole piece 100 and the through hole 111 is coated, so the preparation process is relatively simple. In addition, in this case, the first metal layer 12 or the second metal layer 13 can be used for welding the terminal ear, more convenient.
在另一些具体实施例中，请参阅图7及图8，所述贯通孔111位于所述复合层11的延伸方向的中间 位置且位于所述复合层11的宽方向的一侧边缘，所述电极极片100与所述贯通孔111对应的位置用于焊接中极耳；所述第二活性材料层16完全覆盖所述第二金属层13；所述第一金属层12暴露于所述第一开窗151的部分可以用于焊接极耳；也就是说，当所述电极极片100与所述贯通孔111对应的位置用于焊接中极耳时，使所述第一活性材料层15及所述第二活性材料层16中的一层避开所述电极极片100与所述贯通孔111对应的位置涂覆即可，因贯通孔111位于中间位置，两侧的所述第一活性材料层15及所述第二活性材料层16均开设开窗会增加工艺流程，且并无必要，故本实施例只在所述第一活性材料层15形成开窗；其中，当所述电极极片100与所述贯通孔111对应的位置用于焊接中极耳时，所述第一开窗151可以为激光烧蚀工艺形成。In other specific embodiments, please refer to FIG. 7 and FIG. 8 , the through hole 111 is located in the middle of the extending direction of the composite layer 11 and is located at one side edge of the composite layer 11 in the width direction. The position of the electrode pole piece 100 corresponding to the through hole 111 is used for welding the middle tab; the second active material layer 16 completely covers the second metal layer 13; the first metal layer 12 is exposed to the second metal layer 13; A part of the window 151 can be used for welding the tab; that is, when the position of the electrode tab 100 corresponding to the through hole 111 is used for welding the middle tab, the first active material layer 15 And one layer of the second active material layer 16 can avoid the position corresponding to the electrode sheet 100 and the through hole 111 and coat it. Because the through hole 111 is located in the middle position, the first active material layer on both sides Both the active material layer 15 and the second active material layer 16 have windows that increase the process flow and are not necessary, so this embodiment only forms windows in the first active material layer 15; wherein, when the When the position of the electrode pole piece 100 corresponding to the through hole 111 is used for welding a tab, the first opening 151 may be formed by a laser ablation process.
在一些具体实施例中，请参阅图9及图10，所述电极极片100可以用于焊接多个极耳，所述贯通孔111的数量为多个，所述电极极片100与每个所述贯通孔111对应的位置均用于焊接一个极耳；相应的，所述第一活性材料层15上与各所述贯通孔111对应的位置均设置第一开窗151，以使所述第一金属层12的多个部分暴露于多个所述第一开窗151，所述第一金属层12暴露于所述第一开窗151的部分用于焊接多个中极耳；可以理解，所述第二活性材料层16可以完全覆盖所述第二金属层13。In some specific embodiments, please refer to FIG. 9 and FIG. 10, the electrode pole piece 100 can be used for welding multiple tabs, the number of the through holes 111 is multiple, the electrode pole piece 100 and each The positions corresponding to the through holes 111 are all used for welding a tab; correspondingly, first windows 151 are provided at positions corresponding to each of the through holes 111 on the first active material layer 15, so that the Multiple parts of the first metal layer 12 are exposed to multiple first openings 151, and the parts of the first metal layer 12 exposed to the first openings 151 are used for welding multiple middle tabs; it can be understood that , the second active material layer 16 may completely cover the second metal layer 13 .
可选地，所述第一开窗151及所述第二开窗161的形状为矩形，以易于加工及便于进行后续的焊接极耳的工作；可选地，所述贯通孔111的开口形状也可以与所述第一开窗151及所述第二开窗161的形状相同，所述贯通孔111的开口尺寸也可以与所述第一开窗151及所述第二开窗161的尺寸相同，从而使所述电极极片100具有较好的导电性能。Optionally, the shape of the first window 151 and the second window 161 is a rectangle for easy processing and subsequent welding of tabs; optionally, the opening shape of the through hole 111 It can also be the same as the shape of the first window 151 and the second window 161, and the opening size of the through hole 111 can also be the same as the size of the first window 151 and the second window 161. The same, so that the electrode sheet 100 has better electrical conductivity.
可以理解，所述贯通孔111的开口形状也可以与所述第一开窗151及所述第二开窗161的形状不同，所述贯通孔111的开口尺寸也可以与所述第一开窗151及所述第二开窗161的尺寸不同。It can be understood that the opening shape of the through hole 111 can also be different from the shapes of the first window 151 and the second window 161, and the opening size of the through hole 111 can also be different from that of the first window. 151 and the second window 161 are different in size.
在一些实施例中，如图11及图12所示，所述电极极片100还可以包括极耳17，所述极耳17焊接于所述电极极片100与每个所述贯通孔111对应的位置，具体参前所述，此处不再赘述。In some embodiments, as shown in FIG. 11 and FIG. 12 , the electrode tab 100 may further include tabs 17 , and the tabs 17 are welded to the electrode tab 100 corresponding to each of the through holes 111 The location of , refer to the above for details, and will not be repeated here.
本申请实施例还提供一种如前所述的复合集流体10，所述复合集流体10包括：复合层11，包括相对的第一表面101及第二表面102，所述复合层11上设置有贯通孔111，所述贯通孔111贯通所述第一表面101及所述第二表面101；导电连接件14，设置于所述贯通孔111内；第一金属层12，设置于所述复合层11的所述第一表面101侧；及第二金属层13，设置于所述复合层11的所述第二表面102侧；其中，所述第一金属层12覆盖所述贯通孔111于所述第一表面01侧的开口，所述第二金属层13覆盖所述贯通孔111于所述第二表面102侧的开口，且，所述第一金属层12及所述第二金属层13均与所述导电连接件14相接触。具体参前实施例所述，此处也不再赘述。The embodiment of the present application also provides a composite current collector 10 as described above, the composite current collector 10 includes: a composite layer 11, including an opposite first surface 101 and a second surface 102, and the composite layer 11 is provided with There is a through hole 111, the through hole 111 penetrates through the first surface 101 and the second surface 101; the conductive connector 14 is arranged in the through hole 111; the first metal layer 12 is arranged in the composite The first surface 101 side of the layer 11; and the second metal layer 13, disposed on the second surface 102 side of the composite layer 11; wherein, the first metal layer 12 covers the through hole 111 on the The opening on the side of the first surface 01, the second metal layer 13 covers the opening of the through hole 111 on the side of the second surface 102, and the first metal layer 12 and the second metal layer 13 are all in contact with the conductive connector 14 . For details, refer to the foregoing embodiments, and details are not repeated here.
请参阅图13，为本申请另一实施例提供的一种电极极片的制备方法的示意图；所述电极极片的制备方法包括步骤：Please refer to FIG. 13 , which is a schematic diagram of a method for preparing an electrode pole piece provided by another embodiment of the present application; the method for preparing an electrode pole piece includes steps:
S201，提供复合层，所述复合层包括相对的第一表面及第二表面；S201, providing a composite layer, the composite layer including opposite first surfaces and second surfaces;
S202，并在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；S202, forming a through hole on the composite layer, the through hole passing through the first surface and the second surface;
S203，在所述贯通孔内设置导电连接件；及S203, disposing a conductive connector in the through hole; and
S204，在所述复合层的所述第一表面侧设置第一金属层及在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。S204, disposing a first metal layer on the first surface side of the composite layer and a second metal layer on the second surface side of the composite layer to obtain an electrode sheet; wherein the first metal layer covering the opening of the through hole on the first surface side, the second metal layer covering the opening of the through hole on the second surface side, and the first metal layer and the second metal layer The metal layers are all in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for soldering tabs.
其中，所述复合层11可以为聚对苯二甲酸亚乙酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、 聚醚醚酮、聚酰亚胺、聚酰胺、聚乙二醇、聚酰胺酰亚胺、聚碳酸酯、环状聚烯烃、聚苯硫醚、聚乙酸乙烯酯、聚四氟乙烯，聚亚甲基萘、聚偏二氟乙烯，聚萘二甲酸亚乙酯、聚碳酸亚丙酯、聚(偏二氟乙烯-六氟丙烯)、聚(偏二氟乙烯-共-三氟氯乙烯)、有机硅、维尼纶、聚丙烯、聚乙烯、聚氯乙烯、聚苯乙烯、聚醚腈、聚氨酯、聚苯醚、聚酯、聚砜及其衍生物、羧甲基纤维素钠、丁苯橡胶、氟化橡胶、聚乙烯醇、聚偏氟乙烯等中的一种或多种材料制备形成的膜层。Wherein, the composite layer 11 can be polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, Polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polynaphthalene Ethylene formate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, polyethylene, Polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene rubber, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride One or more materials such as ethylene are prepared to form a film layer.
在所述复合层上形成贯通孔的步骤可以为：通过机械加工的方式在所述复合层上形成所述贯通孔，或，通过激光烧蚀的方式在所述复合层上形成所述贯通孔。The step of forming the through hole on the composite layer may be: forming the through hole on the composite layer by mechanical processing, or forming the through hole on the composite layer by laser ablation .
在所述贯通孔内设置导电连接件的步骤可以为：在所述贯通孔内填充包含导电粒子的导电膏体，固化所述导电膏体得到所述导电连接件；或，在所述贯通孔内放置导电金属片；或，通过沉积金属的方式在所述贯通孔内填充所述导电连接件。The step of arranging the conductive connector in the through hole may be: filling the conductive paste containing conductive particles in the through hole, and curing the conductive paste to obtain the conductive connector; or, in the through hole placing a conductive metal sheet in the through hole; or, filling the conductive connecting piece in the through hole by depositing metal.
在一些实施例中，可以通过蒸镀、气相沉积、化学沉积、磁控溅射、化学镀等沉积工艺中的至少一种工艺在所述复合层的相对两侧形成所述第一金属层与第二金属层；此时，所述导电连接件与所述第一金属层和所述第二金属层中的至少一个可以为同一工艺形成，即，沉积形成所述第一金属层和所述第二金属层中的至少一个的同时在所述贯通孔内沉积形成所述导电连接件。In some embodiments, the first metal layer and the first metal layer can be formed on opposite sides of the composite layer by at least one of deposition processes such as evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating. The second metal layer; at this time, the conductive connector and at least one of the first metal layer and the second metal layer may be formed by the same process, that is, the first metal layer and the second metal layer are formed by deposition At least one of the second metal layers is simultaneously deposited in the through hole to form the conductive connection member.
在另一些实施例中，所述第一金属层与第二金属层还可以为金属箔，可以直接通过粘胶将所述第一金属层与第二金属层分别粘结于所述复合层的相对两侧。In some other embodiments, the first metal layer and the second metal layer can also be metal foils, and the first metal layer and the second metal layer can be directly bonded to the composite layer by glue. opposite sides.
在一些实施例中，如图14所示，形成所述第二金属层之后，还包括步骤：In some embodiments, as shown in FIG. 14, after forming the second metal layer, further steps:
S205，在所述第一金属层表面形成第一活性材料层，及在所述第二金属层表面形成第二活性材料层。S205, forming a first active material layer on the surface of the first metal layer, and forming a second active material layer on the surface of the second metal layer.
在一些具体实施例中，所述贯通孔位于所述复合层的延伸方向的一端，所述第一活性材料层及所述第二活性材料层均避开所述贯通孔形成，从而，所述第一活性材料层上与所述贯通孔对应的位置形成第一开窗，以使所述第一金属层部分暴露于所述第一开窗，所述第二活性材料层上与所述贯通孔对应的位置形成第二开窗，以使所述第二金属层部分暴露于所述第二开窗；所述第一金属层暴露于所述第一开窗的部分或所述第二金属层暴露于所述第二开窗的部分用于焊接端极耳。In some specific embodiments, the through hole is located at one end of the extending direction of the composite layer, and both the first active material layer and the second active material layer are formed avoiding the through hole, so that the A first opening is formed on the first active material layer at a position corresponding to the through hole, so that the first metal layer is partially exposed to the first opening, and the second active material layer is connected to the through hole. A second opening is formed at the position corresponding to the hole, so that the second metal layer is partially exposed to the second opening; the first metal layer is exposed to the part of the first opening or the second metal layer The portion of the layer exposed to the second opening is used for soldering terminal tabs.
在另一些具体实施例中，如图15所示，所述贯通孔位于所述复合层的延伸方向的中间位置且位于所述复合层的宽方向的一侧边缘，在所述第一金属层表面形成第一活性材料层，及在所述第二金属层表面形成第二活性材料层之后，还包括步骤：In some other specific embodiments, as shown in FIG. 15 , the through hole is located in the middle of the extension direction of the composite layer and at one side edge of the composite layer in the width direction. After forming the first active material layer on the surface, and forming the second active material layer on the surface of the second metal layer, the step further includes:
S206，在所述第一活性材料层表面与所述贯通孔对应的位置形成第一开窗，以使所述第一金属层部分暴露于所述第一开窗；其中，所述第一金属层暴露于所述第一开窗的部分用于焊接中极耳；其中，此实施例中，所述第二活性材料层可以完全覆盖所述第二金属层；可以通过激光烧蚀、超声去除或刀切等方式去除与所述贯通孔对应的所述第一活性材料层。S206, forming a first opening at a position corresponding to the through hole on the surface of the first active material layer, so that the first metal layer is partially exposed to the first opening; wherein, the first metal The part of the layer exposed to the first window is used for welding the middle tab; wherein, in this embodiment, the second active material layer can completely cover the second metal layer; it can be removed by laser ablation or ultrasonic or knife cutting to remove the first active material layer corresponding to the through hole.
可以理解，如第一实施例所述，所述贯通孔的数量还可以为多个，对应的可以形成多个开窗，形成多个贯通孔及多个开窗的方法与前述形成贯通孔及开窗的方法相同，此处不再赘述。It can be understood that, as described in the first embodiment, the number of said through holes can also be multiple, and correspondingly multiple windows can be formed, and the method of forming multiple through holes and multiple window openings is the same as the aforementioned method for forming through holes and openings. The method of opening the window is the same and will not be repeated here.
在一些实施例中，所述电极极耳的制备方法还可以包含在暴露的金属层上焊接极耳的步骤。In some embodiments, the method for preparing the electrode tab may further include a step of welding the tab on the exposed metal layer.
本实施例未述及的部分与本申请第一实施例相同，可以参本申请第一实施例的描述，此处不再赘述。Parts not mentioned in this embodiment are the same as those in the first embodiment of the present application, and reference may be made to the description of the first embodiment of the present application, and details are not repeated here.
请参阅图16，为本申请又一实施例提供的一种电极极片的制备方法的示意图；所述电极极片的制备方法包括步骤：Please refer to FIG. 16 , which is a schematic diagram of a method for preparing an electrode pole piece provided by another embodiment of the present application; the preparation method of the electrode pole piece includes steps:
S301，提供第一金属层；S301, providing a first metal layer;
S302，在所述第一金属层上形成复合层，所述复合层包括相对的第一表面及第二表面，所述第一金属层设置于所述第一表面，在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；S302, forming a composite layer on the first metal layer, the composite layer includes opposite first surfaces and second surfaces, the first metal layer is disposed on the first surface, and formed on the composite layer a through hole, the through hole passing through the first surface and the second surface;
S303，在所述贯通孔内设置导电连接件；及S303, disposing a conductive connector in the through hole; and
S304，在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。S304, disposing a second metal layer on the second surface side of the composite layer to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, the The second metal layer covers the opening of the through hole on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the first metal layer The position corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for welding tabs.
优选地，所述第一金属层为压延、电解等方式形成的金属箔。Preferably, the first metal layer is a metal foil formed by calendering or electrolysis.
所述复合层可以为金属粉末及粘结剂混合后涂覆于所述第一金属层表面并固化后得到的；其中，所述金属粉末可以为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金的粉末等中的至少一种，所述粘结剂可以选自聚偏二氟乙烯、偏氟乙烯-氟化烯烃的共聚物、聚四氟乙烯、羧甲基纤维素钠、丁苯橡胶、聚胺酯、氟化橡胶、聚乙烯醇、聚偏氟乙烯、聚酰胺等中的一种或几种；所述金属粉末与所述粘结剂的质量比可以视情况设置，一般情况下，粘结剂的量不宜过多，根据实验情况来看，粘结剂过多时，对电池的循环性能有所影响，可选地，所述金属粉与粘结剂的质量比为50-70:5-35。The composite layer can be obtained by mixing metal powder and binder, coating on the surface of the first metal layer and curing; wherein, the metal powder can be aluminum, copper, nickel, copper, cobalt, tungsten, At least one of the powders of tin, lead, iron, silver, gold, platinum or their alloys, etc., the binder can be selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene One or more of vinyl fluoride, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride, polyamide, etc.; the metal powder and the binder The mass ratio can be set according to the situation. In general, the amount of the binder should not be too much. According to the experimental situation, when the binder is too much, the cycle performance of the battery will be affected. Optionally, the metal powder The mass ratio to the binder is 50-70:5-35.
在一些实施例中，形成所述复合层的材料还可以包括导电剂，也即，还可以在所述金属粉末及粘结剂中混合导电剂；所述导电剂可以为碳纳米管、石墨烯、导电石墨、炭黑、碳纤维、石墨、导电陶瓷粉、复合导电材料等中的至少一种，导电剂能够提高电池的性能，其中，导电剂的量不宜过多，以避免对极片电位的影响，可选地，所述金属粉与导电剂的质量比为50-70:10-20。In some embodiments, the material forming the composite layer can also include a conductive agent, that is, a conductive agent can also be mixed in the metal powder and the binder; the conductive agent can be carbon nanotubes, graphene , conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material, etc., the conductive agent can improve the performance of the battery, and the amount of the conductive agent should not be too much to avoid affecting the electrode potential Influence, optionally, the mass ratio of the metal powder to the conductive agent is 50-70:10-20.
在一些实施例中，形成所述复合层的材料还可以包括活性物质，也即，还可以在所述金属粉末及粘结剂中混合活性物质；所述活性物质可以为磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、富锂锰基材料、镍钴铝酸锂、氧化亚硅、氧化锡、钛酸锂等中的至少一种。In some embodiments, the material forming the composite layer can also include an active material, that is, an active material can also be mixed in the metal powder and the binder; the active material can be lithium iron phosphate, manganese phosphate Lithium iron, lithium vanadium phosphate, lithium vanadium oxyphosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, nickel cobalt lithium manganate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, silicon oxide, tin oxide, titanium At least one of lithium oxide and the like.
在一些实施例中，在所述第一金属层上形成一复合层，在所述复合层上形成贯通孔的步骤可以为：In some embodiments, a composite layer is formed on the first metal layer, and the step of forming a through hole on the composite layer may be:
在所述第一金属层上设置遮蔽件，在所述第一金属层表面涂覆形成所述复合层的材料，从而使形成所述复合层的材料避开所述遮蔽件设置，之后，去除所述遮蔽件，在与所述遮蔽件对应的位置形成所述贯通孔。A shielding member is provided on the first metal layer, and the material forming the composite layer is coated on the surface of the first metal layer, so that the material forming the composite layer avoids the setting of the shielding member, and then removed In the shielding member, the through hole is formed at a position corresponding to the shielding member.
其中，形成所述复合层的材料可以在去除所述遮蔽件之前固化，也可以在形成所述第二金属层之后固化。在另一些实施例中，在所述第一金属层上形成一复合层，在所述复合层上形成贯通孔的步骤可以为：Wherein, the material forming the composite layer may be cured before removing the shielding member, or may be cured after forming the second metal layer. In some other embodiments, a composite layer is formed on the first metal layer, and the step of forming a through hole on the composite layer may be:
在所述第一金属层表面涂覆形成所述复合层的材料，得到复合层；及coating the material forming the composite layer on the surface of the first metal layer to obtain a composite layer; and
去除部分区域的所述复合层，从而在所述复合层上形成所述贯通孔；removing a partial region of the composite layer, thereby forming the through hole in the composite layer;
其中，可以通过机械方式或激光烧蚀等方式去除部分区域的所述复合层。Wherein, the composite layer in a partial area may be removed by mechanical means or laser ablation.
其中，形成所述复合层的材料可以在去除部分区域的所述复合层之前固化，也可以在形成所述第二金属层之后固化。Wherein, the material forming the composite layer may be cured before removing the composite layer in a part of the region, or may be cured after forming the second metal layer.
在所述贯通孔内设置导电连接件的步骤可以为：在所述贯通孔内填充包含导电粒子的导电膏体，固化所述导电膏体得到所述导电连接件；或，直接在所述贯通孔内放置导电金属片；或，通过沉积金属的方式在所述贯通孔内填充所述导电连接件。The step of arranging the conductive connector in the through hole may be: filling the conductive paste containing conductive particles in the through hole, curing the conductive paste to obtain the conductive connector; or, directly forming the conductive connector in the through hole. A conductive metal sheet is placed in the hole; or, the conductive connector is filled in the through hole by depositing metal.
在一些实施例中，可以通过蒸镀、气相沉积、化学沉积、磁控溅射、化学镀等沉积工艺中的至少一种工艺在所述复合层的相对两侧形成所述第二金属层，此时，优选形成所述复合层的材料可以在形成所述第二金属层之前固化；另外，所述导电连接件与所述第二金属层可以为同一工艺形成，即，形成所述第二金属层的同时通过沉积金属的方式在所述贯通孔内填充形成所述导电连接件。In some embodiments, the second metal layer may be formed on opposite sides of the composite layer by at least one of deposition processes such as evaporation, vapor deposition, chemical deposition, magnetron sputtering, and chemical plating, At this time, it is preferable that the material forming the composite layer can be solidified before forming the second metal layer; in addition, the conductive connector and the second metal layer can be formed in the same process, that is, forming the second metal layer At the same time, the metal layer is filled in the through hole by depositing metal to form the conductive connector.
在另一些实施例中，所述第二金属层还可以为金属箔，优选形成所述复合层的材料可以在形成所述第二金属层之后固化，形成所述复合层的材料可以兼具粘胶的作用，所述第二金属层可以铺设于形成所述复合层的材料，之后通过碾压及固化工艺使所述第一金属层及第二金属层均与所述复合层相粘结。In some other embodiments, the second metal layer can also be a metal foil. Preferably, the material forming the composite layer can be solidified after forming the second metal layer, and the material forming the composite layer can also have adhesive properties. Using glue, the second metal layer can be laid on the material forming the composite layer, and then both the first metal layer and the second metal layer are bonded to the composite layer through rolling and curing processes.
在又一实施例中，所述第二金属层也可以为金属箔，形成所述复合层的材料可以在形成所述第二金属层之前固化，之后，可以通过粘胶将所述第二金属层粘结于所述复合层的远离所述第一金属层的一侧。In yet another embodiment, the second metal layer can also be a metal foil, and the material forming the composite layer can be cured before forming the second metal layer, and then the second metal layer can be glued together A layer is bonded to the side of the composite layer remote from the first metal layer.
在一些实施例中，如图17所示，形成所述第二金属层之后，还包括步骤：In some embodiments, as shown in FIG. 17, after forming the second metal layer, further steps:
S305，在所述第一金属层表面形成第一活性材料层，及在所述第二金属层表面形成第二活性材料层。S305, forming a first active material layer on the surface of the first metal layer, and forming a second active material layer on the surface of the second metal layer.
在一些具体实施例中，所述贯通孔位于所述复合层的延伸方向的一端，所述第一活性材料层及所述第二活性材料层均避开与所述贯通孔对应的位置形成，从而，所述第一活性材料层上与所述贯通孔对应的位置形成第一开窗，以使所述第一金属层部分暴露于所述第一开窗，所述第二活性材料层上与所述贯通孔对应的位置形成第二开窗，以使所述第二金属层部分暴露于所述第二开窗；所述第一金属层暴露于所述第一开窗的部分或所述第二金属层暴露于所述第二开窗的部分用于焊接端极耳。In some specific embodiments, the through hole is located at one end of the extension direction of the composite layer, and the first active material layer and the second active material layer are formed avoiding positions corresponding to the through hole, Therefore, a first opening is formed on the first active material layer at a position corresponding to the through hole, so that the first metal layer is partially exposed to the first opening, and the second active material layer A second opening is formed at a position corresponding to the through hole, so that the second metal layer is partially exposed to the second opening; the part of the first metal layer exposed to the first opening or the entire The part of the second metal layer exposed to the second window is used for soldering the terminal lug.
在另一些具体实施例中，如图18所示，所述贯通孔位于所述复合层的延伸方向的中间位置且位于所述复合层的宽方向的一侧边缘，在所述第一金属层表面形成第一活性材料层，及在所述第二金属层表面形成第二活性材料层之后，还包括步骤：In some other specific embodiments, as shown in FIG. 18 , the through hole is located in the middle of the extending direction of the composite layer and is located at one side edge of the composite layer in the width direction. After forming the first active material layer on the surface, and forming the second active material layer on the surface of the second metal layer, the step further includes:
S306，在所述第一活性材料层表面与所述贯通孔对应的位置形成第一开窗，以使所述第一金属层部分暴露于所述第一开窗；其中，所述第一金属层暴露于所述第一开窗的部分用于焊接极耳。S306, forming a first opening at a position corresponding to the through hole on the surface of the first active material layer, so that the first metal layer is partially exposed to the first opening; wherein the first metal The portion of the layer exposed to the first opening is used for soldering tabs.
其中，所述第二活性材料层可以完全覆盖所述第二金属层。Wherein, the second active material layer may completely cover the second metal layer.
在一些实施例中，可以通过激光烧蚀、超声去除或刀切等方式去除与所述贯通孔对应的所述第一活性材料层。In some embodiments, the first active material layer corresponding to the through hole may be removed by laser ablation, ultrasonic removal or knife cutting.
也就是说，本申请中，开窗可以直接在形成活性材料层时避位形成，也可以全铺活性材料层后再去除。That is to say, in the present application, the window can be formed directly when the active material layer is formed, or it can be removed after the active material layer is fully laid.
可以理解，如第一实施例所述，所述贯通孔的数量可以为多个，对应的可以形成多个开窗，形成多个贯通孔及多个开窗的方法与前述形成贯通孔及开窗的方法相同，此处不再赘述。It can be understood that, as described in the first embodiment, the number of said through holes can be multiple, and correspondingly multiple windows can be formed. The method of window is the same, and will not be repeated here.
在一些实施例中，所述电极极片的制备方法还可以包含在暴露的金属层上焊接极耳的步骤。In some embodiments, the method for preparing the electrode tab may further include the step of welding tabs on the exposed metal layer.
本实施例未述及的部分与本申请第一实施例相同，可以参本申请第一实施例的描述，此处不再赘述。Parts not mentioned in this embodiment are the same as those in the first embodiment of the present application, and reference may be made to the description of the first embodiment of the present application, and details are not repeated here.
请参阅图19及图20，本申请又一实施例提供一种电池400，所述电池400包括电极组件410及电解液420，电极组件410包括正极极片401、负极极片402、隔膜403，其中，所述正极极片及负极极片为本申请第一实施例所述的电极极片，或，为本申请第二实施例所述的电极极片的制备方法制备得到的电极极片。Please refer to FIG. 19 and FIG. 20 , another embodiment of the present application provides a battery 400, the battery 400 includes an electrode assembly 410 and an electrolyte 420, the electrode assembly 410 includes a positive pole piece 401, a negative pole piece 402, and a separator 403, Wherein, the positive pole piece and the negative pole piece are the electrode pole pieces described in the first embodiment of the present application, or the electrode pole pieces prepared by the method for preparing the electrode pole pieces described in the second embodiment of the present application.
其中，如图20所示，可以通过将所述正极极片401、负极极片402及隔膜403卷绕之后得到电极组件410。Wherein, as shown in FIG. 20 , the electrode assembly 410 can be obtained by winding the positive pole piece 401 , the negative pole piece 402 and the separator 403 .
如图21所示，本申请又一实施例还提供一种电子设备500，所述电子设备500包括电池盖501及收容于所述电池盖501中的如本申请前述实施例所述的电池400。As shown in Figure 21, another embodiment of the present application also provides an electronic device 500, the electronic device 500 includes a battery cover 501 and the battery 400 contained in the battery cover 501 as described in the previous embodiments of the present application .
在一些实施例中，所述电子设备500例如为智能手机、笔记本电脑、平板电脑、游戏设备等便携式、移动计算设备、可穿戴设备等。In some embodiments, the electronic device 500 is, for example, a smart phone, a notebook computer, a tablet computer, a game device, a portable computing device, a wearable device, or the like.
以下结合具体实施例对本案的电极极片进行说明。The electrode sheet of this case will be described below in combination with specific embodiments.
实施例1Example 1
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为复合集流 体表面涂覆正极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铝层，其中，所述PET膜层延伸方向的一端形成有贯通孔，所述贯通孔内填充有铝片，所述PET膜层两侧的所述铝层均与所述铝片相接触从而可以电连接，所述正极活性材料暴露出贯通孔对应的沉积铝层，正极极片的极耳与所述贯通孔对应焊接；所述负极极片为金属铜表面涂覆负极活性材料形成。A battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, one end of the extension direction of the PET film layer is formed with a through hole, and the through hole is filled with aluminum flakes, and the PET film The aluminum layers on both sides of the layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece is welded correspondingly to the through hole; The negative pole piece is formed by coating the surface of metal copper with negative active material.
对实施例1的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Example 1 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
实施例2Example 2
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为复合集流体表面涂覆正极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铝层，其中，所述PET膜层延伸方向的中部边缘形成有贯通孔，所述贯通孔内填充有铝片，所述PET膜层两侧的所述铝层均与所述铝片相接触从而可以电连接，所述正极活性材料暴露出与贯通孔对应的沉积铝层，正极极片的极耳与所述贯通孔对应焊接；所述负极极片为金属铜表面涂覆负极活性材料形成。A battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, a through hole is formed on the edge of the middle part of the extension direction of the PET film layer, and aluminum flakes are filled in the through hole, and the PET film layer The aluminum layers on both sides of the film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece corresponds to the through hole Welding; the negative pole piece is formed by coating the surface of metal copper with negative active material.
对实施例2的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Example 2 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
实施例3Example 3
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为复合集流体表面涂覆正极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铝层，其中，所述PET膜层延伸方向的中部边缘形成有多个贯通孔，所述贯通孔内填充有铝片，所述PET膜层两侧的所述铝层均与所述铝片相接触从而可以电连接，所述正极活性材料暴露出贯通孔与的沉积铝层，每个正极极片的多个极耳与多个所述贯通孔对应焊接；所述负极极片为金属铜表面涂覆负极活性材料形成。A battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair Deposited aluminum layers are respectively formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein a plurality of through-holes are formed on the middle edge of the extending direction of the PET film layer, and aluminum sheets are filled in the through-holes, so that The aluminum layers on both sides of the PET film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes through holes and the deposited aluminum layer, and the multiple tabs of each positive electrode sheet are connected to the aluminum sheet. The plurality of through holes are correspondingly welded; the negative electrode sheet is formed by coating the negative electrode active material on the surface of metal copper.
对实施例3的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Example 3 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
实施例4Example 4
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为复合集流体表面涂覆正极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铝层，其中，所述PET膜层延伸方向的一端形成有贯通孔，所述贯通孔内填充有铝片，所述PET膜层两侧的所述铝层均与所述铝片相接触从而可以电连接，所述正极活性材料暴露出与贯通孔对应的沉积铝层，正极极片的极耳与所述贯通孔对应焊接；所述负极极片为复合集流体表面涂覆负极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铜层，其中，所述PET膜层延伸方向的一端形成有贯通孔，所述贯通孔内填充有铜片，所述PET膜层两侧的所述铜层均与所述铜片相接触从而可以电连接，所述负极活性材料暴露出与贯通孔对应的沉积铜层，负极极片的极耳与所述贯通孔对应焊接。A battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, one end of the extension direction of the PET film layer is formed with a through hole, and the through hole is filled with aluminum flakes, and the PET film The aluminum layers on both sides of the aluminum layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece is welded correspondingly to the through hole The negative electrode sheet is formed by coating the negative electrode active material on the surface of the composite current collector, and the structure of the composite current collector is that a deposited copper layer is formed on both sides of the polyethylene terephthalate (PET) film layer, wherein, One end of the extending direction of the PET film layer is formed with a through hole, the through hole is filled with a copper sheet, and the copper layers on both sides of the PET film layer are in contact with the copper sheet so as to be electrically connected. The negative electrode active material exposes the deposited copper layer corresponding to the through hole, and the lug of the negative electrode sheet is welded correspondingly to the through hole.
对实施例4的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Example 4 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
实施例5Example 5
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为复合集流体表面涂覆正极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别 形成沉积铝层，其中，所述PET膜层延伸方向的中部边缘形成有贯通孔，所述贯通孔内填充有铝片，所述PET膜层两侧的所述铝层均与所述铝片相接触从而可以电连接，所述正极活性材料暴露出与贯通孔对应的沉积铝层，正极极片的极耳与所述贯通孔对应焊接；所述负极极片为复合集流体表面涂覆负极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铜层，其中，所述PET膜层延伸方向的中部边缘形成有贯通孔，所述贯通孔内填充有铜片，所述PET膜层两侧的所述铜层均与所述铜片相接触从而可以电连接，所述负极活性材料暴露出与贯通孔对应的沉积铜层，负极极片的极耳与所述贯通孔对应焊接。A battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, a through hole is formed on the edge of the middle part of the extension direction of the PET film layer, and aluminum flakes are filled in the through hole, and the PET film layer The aluminum layers on both sides of the film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the tab of the positive pole piece corresponds to the through hole Welding; the negative electrode sheet is formed by coating the negative electrode active material on the surface of the composite current collector, and the structure of the composite current collector is that a deposited copper layer is formed on both sides of the polyethylene terephthalate (PET) film layer, wherein , the middle edge of the extending direction of the PET film layer is formed with a through hole, the through hole is filled with a copper sheet, and the copper layers on both sides of the PET film layer are in contact with the copper sheet so as to be electrically connected , the negative electrode active material exposes the deposited copper layer corresponding to the through hole, and the lug of the negative electrode sheet is welded correspondingly to the through hole.
对实施例5的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Example 5 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
实施例6Example 6
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为复合集流体表面涂覆正极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铝层，其中，所述PET膜层延伸方向的中部边缘形成有贯通孔，所述贯通孔内填充有铝片，所述PET膜层两侧的所述铝层均与所述铝片相接触从而可以电连接，所述正极活性材料暴露出与贯通孔对应的沉积铝层，每个正极极片的多个极耳与多个所述贯通孔对应焊接；所述负极极片为复合集流体表面涂覆负极活性材料形成，所述复合集流体的结构为聚对苯二甲酸乙二醇酯(PET)膜层两侧分别形成沉积铜层，其中，所述PET膜层延伸方向的中部边缘形成有贯通孔，所述贯通孔内填充有铜片，所述PET膜层两侧的所述铜层均与所述铜片相接触从而可以电连接，所述负极活性材料暴露出与贯通孔对应的沉积铜层，每个负极极片的多个极耳与多个所述贯通孔对应焊接。A battery is prepared, and the battery includes a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte; wherein, the positive electrode sheet is formed by coating a positive electrode active material on the surface of a composite current collector, and the structure of the composite current collector is a pair A deposited aluminum layer is formed on both sides of the ethylene glycol phthalate (PET) film layer, wherein, a through hole is formed on the edge of the middle part of the extension direction of the PET film layer, and aluminum flakes are filled in the through hole, and the PET film layer The aluminum layers on both sides of the film layer are in contact with the aluminum sheet so as to be electrically connected, the positive electrode active material exposes the deposited aluminum layer corresponding to the through hole, and the multiple tabs of each positive electrode sheet are connected to the multiple The through-holes are correspondingly welded; the negative pole piece is formed by coating the negative active material on the surface of the composite current collector, and the structure of the composite current collector is polyethylene terephthalate (PET) film layer on both sides respectively. A deposited copper layer is formed, wherein a through hole is formed on the middle edge of the extending direction of the PET film layer, and copper sheets are filled in the through holes, and the copper layers on both sides of the PET film layer are all connected to the copper sheet In contact with each other so as to be electrically connected, the negative electrode active material exposes the deposited copper layer corresponding to the through holes, and the plurality of tabs of each negative electrode sheet are welded correspondingly to the plurality of through holes.
对实施例6的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Example 6 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
对比例1Comparative example 1
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为金属铝制成，所述负极极片为金属铜制成。极耳分别焊接于正极极片及负极极片的延伸方向的端部。A battery is prepared, and the battery includes a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; wherein, the positive pole piece is made of metal aluminum, and the negative pole piece is made of metal copper. The tabs are respectively welded to the ends of the positive pole piece and the negative pole piece in the extending direction.
对对比例1的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Comparative Example 1 was subjected to a weight impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
对比例2Comparative example 2
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为金属铝制成，所述负极极片为金属铜制成。极耳分别焊接于正极极片及负极极片延伸方向的中部边缘。A battery is prepared, and the battery includes a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; wherein, the positive pole piece is made of metal aluminum, and the negative pole piece is made of metal copper. The tabs are respectively welded to the middle edges of the positive pole piece and the negative pole piece in the extending direction.
对对比例2的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Comparative Example 2 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charging rate were detected.
对比例3Comparative example 3
制备一电池，所述电池包括正极极片、负极极片、隔膜及电解液；其中，所述正极极片为金属铝制成，所述负极极片为金属铜制成。多个极耳分别焊接于每个正极极片及负极极片延伸方向的中部边缘。A battery is prepared, and the battery includes a positive pole piece, a negative pole piece, a diaphragm and an electrolyte; wherein, the positive pole piece is made of metal aluminum, and the negative pole piece is made of metal copper. A plurality of tabs are respectively welded to the middle edge of each positive pole piece and the negative pole piece in the extending direction.
对对比例3的电池进行重物冲击测试、针刺测试及挤压测试，并检测电池0.2C的体积能量密度及最大充电倍率。The battery of Comparative Example 3 was subjected to a heavy object impact test, a needle penetration test and an extrusion test, and the volumetric energy density of the battery at 0.2C and the maximum charge rate were detected.
其中，重物冲击测试、针刺测试、挤压测试、电池0.2C的体积能量密度及最大充电倍率的测试方法均参GB/T 18287-2000国家标准进行测试。Among them, the test methods of heavy object impact test, acupuncture test, extrusion test, battery 0.2C volumetric energy density and maximum charge rate are all tested according to GB/T 18287-2000 national standard.
测试结果见下表：The test results are shown in the table below:
表1Table 1
Figure PCTCN2022077107-appb-000001
Figure PCTCN2022077107-appb-000001
由上表可以看出，实施例1至实施例6的重物冲击测试、针刺测试及挤压测试均为100％通过，而对比例1至对比例3的重物冲击测试、针刺测试及挤压测试则全部未通过，也就是说，包含本申请实施例的电极极片的电池的安全系数较电极均为纯金属的电池安全系数高，本申请的电极极片可以大大提升电池的安全系数。As can be seen from the above table, the heavy object impact test, acupuncture test and extrusion test of embodiment 1 to embodiment 6 are all 100% passed, while the heavy object impact test and acupuncture test of comparative example 1 to comparative example 3 And the extrusion test all failed, that is to say, the safety factor of the battery comprising the electrode pole piece of the embodiment of the present application is higher than that of the battery whose electrodes are all pure metal, and the electrode pole piece of the present application can greatly improve the safety factor of the battery. Safety factor.
在本文中提及“实施例”“实施方式”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现所述短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of a phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.
最后应说明的是，以上实施方式仅用以说明本申请的技术方案而非限制，尽管参照以上较佳实施方式对本申请进行了详细说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换都不应脱离本申请技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be The modification or equivalent replacement of the scheme shall not deviate from the spirit and scope of the technical scheme of the present application.

Claims (20)

  1. 一种电极极片，其特征在于，包括：An electrode pole piece, characterized in that it comprises:
    复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；A composite layer, including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the second surface;
    导电连接件，设置于所述贯通孔内；a conductive connector disposed in the through hole;
    第一金属层，设置于所述复合层的所述第一表面侧；及a first metal layer disposed on the first surface side of the composite layer; and
    第二金属层，设置于所述复合层的所述第二表面侧；a second metal layer disposed on the second surface side of the composite layer;
    其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。Wherein, the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first Both the metal layer and the second metal layer are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for Solder the tabs.
  2. 如权利要求1所述的电极极片，其特征在于，所述电极极片还包括设置于所述第一金属层远离所述复合层的表面侧的第一活性材料层，及设置于所述第二金属层远离所述复合层的表面侧的第二活性材料层；其中，所述第一活性材料层上与所述贯通孔对应的位置设置第一开窗，以使所述第一金属层部分暴露于所述第一开窗。The electrode pole piece according to claim 1, characterized in that, the electrode pole piece further comprises a first active material layer disposed on the surface side of the first metal layer away from the composite layer, and disposed on the The second metal layer is away from the second active material layer on the surface side of the composite layer; wherein, a first window is set on the first active material layer corresponding to the through hole, so that the first metal A layer is partially exposed to the first fenestration.
  3. 如权利要求2所述的电极极片，其特征在于，所述贯通孔位于所述复合层的延伸方向的一端；所述第二活性材料层上与所述贯通孔对应的位置设置第二开窗，以使所述第二金属层部分暴露于所述第二开窗；The electrode sheet according to claim 2, wherein the through hole is located at one end of the extension direction of the composite layer; a second opening is provided at a position corresponding to the through hole on the second active material layer. a window, such that the second metal layer is partially exposed to the second opening;
    所述第一金属层暴露于所述第一开窗的部分和/或所述第二金属层暴露于所述第二开窗的部分用于焊接端极耳。The part of the first metal layer exposed to the first window and/or the part of the second metal layer exposed to the second window is used for soldering terminal lugs.
  4. 如权利要求2所述的电极极片，其特征在于，所述贯通孔位于所述复合层的延伸方向的中间位置且位于所述复合层的宽方向的一侧边缘；所述第二活性材料层完全覆盖所述第二金属层；所述第一金属层暴露于所述第一开窗的部分用于焊接中极耳。The electrode sheet according to claim 2, wherein the through hole is located in the middle of the extension direction of the composite layer and is located at one side edge of the composite layer in the width direction; the second active material The layer completely covers the second metal layer; the part of the first metal layer exposed to the first window is used for welding the tab.
  5. 如权利要求2所述的电极极片，其特征在于，所述电极极片用于焊接多个极耳，所述贯通孔位于所述复合层的延伸方向的中间位置且位于所述复合层的宽方向的一侧边缘，所述贯通孔的数量为多个，所述第一活性材料层上与各所述贯通孔对应的位置均设置第一开窗，以使所述第一金属层部分暴露于多个所述第一开窗；所述第二活性材料层完全覆盖所述第二金属层；所述第一金属层暴露于多个所述第一开窗的部分用于对应焊接多个极耳。The electrode pole piece according to claim 2, wherein the electrode pole piece is used for welding a plurality of tabs, and the through hole is located in the middle of the extending direction of the composite layer and at the center of the composite layer. On one side edge in the width direction, the number of the through holes is multiple, and the positions corresponding to each of the through holes on the first active material layer are all provided with first windows, so that the first metal layer part exposed to a plurality of first openings; the second active material layer completely covers the second metal layer; the first metal layer is exposed to a plurality of first openings for corresponding welding a polar ear.
  6. 如权利要求1所述的电极极片，其特征在于，所述导电连接件为沉积金属；所述第一金属层和所述第二金属层中的至少一个与所述导电连接件为一体结构。The electrode pole piece according to claim 1, wherein the conductive connector is deposited metal; at least one of the first metal layer and the second metal layer is integrated with the conductive connector .
  7. 如权利要求1所述的电极极片，其特征在于，所述导电连接件为固化的包含导电粒子的导电膏体，或，所述导电连接件为金属片。The electrode sheet according to claim 1, wherein the conductive connector is a cured conductive paste containing conductive particles, or the conductive connector is a metal sheet.
  8. 如权利要求1所述的电极极片，其特征在于，所述复合层包括聚对苯二甲酸亚乙酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、聚醚醚酮、聚酰亚胺、聚酰胺、聚乙二醇、聚酰胺酰亚胺、聚碳酸酯、环状聚烯烃、聚苯硫醚、聚乙酸乙烯酯、聚四氟乙烯，聚亚甲基萘、聚偏二氟乙烯，聚萘二甲酸亚乙酯、聚碳酸亚丙酯、聚(偏二氟乙烯-六氟丙烯)、聚(偏二氟乙烯-共-三氟氯乙烯)、有机硅、维尼纶、聚丙烯、聚乙烯、聚氯乙烯、聚苯乙烯、聚醚腈、聚氨酯、聚苯醚、聚酯、聚砜及其衍生物、羧甲基纤维素钠、丁苯橡胶、氟化橡胶、聚乙烯醇、聚偏氟乙烯中的一种或多种。The electrode pole piece according to claim 1, wherein the composite layer comprises polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether Etherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene Naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), organic Silicon, vinylon, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene rubber, One or more of fluorinated rubber, polyvinyl alcohol, and polyvinylidene fluoride.
  9. 如权利要求8所述的电极极片，其特征在于，所述第一金属层和所述第二金属层通过沉积工艺设置于所述复合层的所述第一表面侧及所述第二表面侧，或，所述第一金属层和所述第二金属层为金属箔且通过粘胶粘结于所述复合层的所述第一表面侧及所述第二表面侧。The electrode sheet according to claim 8, wherein the first metal layer and the second metal layer are disposed on the first surface side and the second surface of the composite layer through a deposition process side, or, the first metal layer and the second metal layer are metal foils and are bonded to the first surface side and the second surface side of the composite layer by adhesive.
  10. 如权利要求1所述的电极极片，其特征在于，所述复合层包括导电剂、粘结剂、活性物质以及金属粉末；其中，所述导电剂为碳纳米管、石墨烯、导电石墨、炭黑、碳纤维、石墨、导电陶瓷粉、复合导电材料中的至少一种；所述粘结剂选自聚偏二氟乙烯、偏氟乙烯-氟化烯烃的共聚物、聚四氟乙烯、羧甲基纤维素钠、丁苯橡胶、聚胺酯、氟化橡胶、聚乙烯醇、聚偏氟乙烯、聚酰胺中的一种或几种；所述活性物质为磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、富锂锰基材料、镍钴铝酸锂、氧化亚硅、氧化锡、钛酸锂中的至少一种；所述金属粉末为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金的粉末中的至少一种。The electrode pole piece according to claim 1, wherein the composite layer includes a conductive agent, a binding agent, an active material and a metal powder; wherein the conductive agent is carbon nanotubes, graphene, conductive graphite, At least one of carbon black, carbon fiber, graphite, conductive ceramic powder, and composite conductive material; the binder is selected from polyvinylidene fluoride, a copolymer of vinylidene fluoride-fluoroolefin, polytetrafluoroethylene, One or more of sodium methylcellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride, and polyamide; the active substance is lithium iron phosphate, lithium manganese iron phosphate, phosphoric acid Lithium vanadium, lithium vanadyl phosphate, lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, silicon oxide, tin oxide, lithium titanate At least one; the metal powder is at least one of powders of aluminum, copper, nickel, copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or alloys thereof.
  11. 根据权利要求10所述的电极极片，其特征在于，所述金属粉末、所述粘结剂及所述导电剂的质量比为(50-70):(5-35):(10-20)。The electrode pole piece according to claim 10, wherein the mass ratio of the metal powder, the binder and the conductive agent is (50-70):(5-35):(10-20 ).
  12. 如权利要求10所述的电极极片，其特征在于，所述复合层复用作粘胶直接与所述第一金属层和所述第二金属层相粘结。The electrode sheet according to claim 10, characterized in that, the composite layer is reused as an adhesive to directly bond with the first metal layer and the second metal layer.
  13. 如权利要求1所述的电极极片，其特征在于，所述复合层的厚度为1微米至40微米；所述第一金属层和所述第二金属层的厚度均为1纳米至10微米。The electrode pole piece according to claim 1, wherein the thickness of the composite layer is 1 micron to 40 microns; the thickness of the first metal layer and the second metal layer are both 1 nanometer to 10 microns .
  14. 一种复合集流体，其特征在于，包括：A composite current collector, characterized in that it comprises:
    复合层，包括相对的第一表面及第二表面，所述复合层上设置有贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；A composite layer, including opposite first surfaces and second surfaces, the composite layer is provided with through holes, and the through holes pass through the first surface and the second surface;
    导电连接件，设置于所述贯通孔内；a conductive connector disposed in the through hole;
    第一金属层，设置于所述复合层的所述第一表面侧；及a first metal layer disposed on the first surface side of the composite layer; and
    第二金属层，设置于所述复合层的所述第二表面侧；a second metal layer disposed on the second surface side of the composite layer;
    其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触。Wherein, the first metal layer covers the opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first Both the metal layer and the second metal layer are in contact with the conductive connector.
  15. 根据权利要求14所述的复合集流体，其特征在于，所述复合层包括聚对苯二甲酸亚乙酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯、聚醚醚酮、聚酰亚胺、聚酰胺、聚乙二醇、聚酰胺酰亚胺、聚碳酸酯、环状聚烯烃、聚苯硫醚、聚乙酸乙烯酯、聚四氟乙烯，聚亚甲基萘、聚偏二氟乙烯，聚萘二甲酸亚乙酯、聚碳酸亚丙酯、聚(偏二氟乙烯-六氟丙烯)、聚(偏二氟乙烯-共-三氟氯乙烯)、有机硅、维尼纶、聚丙烯、聚乙烯、聚氯乙烯、聚苯乙烯、聚醚腈、聚氨酯、聚苯醚、聚酯、聚砜及其衍生物、羧甲基纤维素钠、丁苯橡胶、氟化橡胶、聚乙烯醇、聚偏氟乙烯中的一种或多种；The composite current collector according to claim 14, wherein the composite layer comprises polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether Etherketone, polyimide, polyamide, polyethylene glycol, polyamideimide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene Naphthalene, polyvinylidene fluoride, polyethylene naphthalate, polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), organic Silicon, vinylon, polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyether nitrile, polyurethane, polyphenylene ether, polyester, polysulfone and its derivatives, sodium carboxymethyl cellulose, styrene-butadiene rubber, One or more of fluorinated rubber, polyvinyl alcohol, polyvinylidene fluoride;
    或者，or,
    所述复合层包括导电剂、粘结剂、活性物质以及金属粉末；其中，所述导电剂为碳纳米管、石墨烯、导电石墨、炭黑、碳纤维、石墨、导电陶瓷粉、复合导电材料中的至少一种；所述粘结剂选自聚偏二氟乙烯、偏氟乙烯-氟化烯烃的共聚物、聚四氟乙烯、羧甲基纤维素钠、丁苯橡胶、聚胺酯、氟化橡胶、聚乙烯醇、聚偏氟乙烯、聚酰胺中的一种或几种；所述活性物质为磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、富锂锰基材料、镍钴铝酸锂、氧化亚硅、氧化锡、钛酸锂中的至少一种；所述金属粉末为铝、铜、镍、铜、钴、钨、锡、铅、铁、银、金、铂或其合金的粉末中的至少一种。The composite layer includes conductive agent, binder, active material and metal powder; wherein, the conductive agent is carbon nanotube, graphene, conductive graphite, carbon black, carbon fiber, graphite, conductive ceramic powder, composite conductive material At least one of; the binder is selected from polyvinylidene fluoride, vinylidene fluoride-fluorinated olefin copolymer, polytetrafluoroethylene, sodium carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber , polyvinyl alcohol, polyvinylidene fluoride, polyamide; the active material is lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium cobaltate, lithium manganate , lithium nickelate, lithium nickel-cobalt manganate, lithium-rich manganese-based materials, lithium-nickel-cobalt-aluminate, silicon oxide, tin oxide, lithium titanate; the metal powder is aluminum, copper, nickel, At least one of powders of copper, cobalt, tungsten, tin, lead, iron, silver, gold, platinum or alloys thereof.
  16. 一种电极极片的制备方法，其特征在于，包括：A method for preparing an electrode pole piece, characterized in that it comprises:
    提供复合层，所述复合层包括相对的第一表面及第二表面；providing a composite layer comprising opposing first and second surfaces;
    在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；forming a through hole on the composite layer, the through hole passing through the first surface and the second surface;
    在所述贯通孔内设置导电连接件；及providing a conductive connector in the through hole; and
    在所述复合层的所述第一表面侧设置第一金属层及在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。A first metal layer is provided on the first surface side of the composite layer and a second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein the first metal layer covers The opening of the through hole on the first surface side, the second metal layer covers the opening of the through hole on the second surface side, and the first metal layer and the second metal layer All are in contact with the conductive connector; the position of the first metal layer corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for soldering tabs.
  17. 如权利要求16所述的电极极片的制备方法，其特征在于，所述第一金属层和所述第二金属层通过蒸镀、气相沉积、化学沉积、磁控溅射、化学镀中的至少一种工艺形成于所述复合层的相对两侧表面，所述导电连接件与所述第一金属层和所述第二金属层中的至少一个为同一工艺形成；或，所述第一金属层和所述第二金属层通过胶粘剂分别粘结于所述复合层的相对两侧表面。The preparation method of electrode pole piece as claimed in claim 16, is characterized in that, described first metal layer and described second metal layer are obtained by evaporation, vapor deposition, chemical deposition, magnetron sputtering, electroless plating At least one process is formed on opposite side surfaces of the composite layer, and the conductive connector is formed by the same process as at least one of the first metal layer and the second metal layer; or, the first The metal layer and the second metal layer are respectively bonded to two opposite surfaces of the composite layer through an adhesive.
  18. 一种电极极片的制备方法，其特征在于，包括：A method for preparing an electrode pole piece, characterized in that it comprises:
    提供第一金属层；providing a first metal layer;
    在所述第一金属层上设置一复合层，所述复合层包括相对的第一表面及第二表面，所述第一金属层设置于所述第一表面；A composite layer is disposed on the first metal layer, the composite layer includes opposite first surfaces and second surfaces, and the first metal layer is disposed on the first surface;
    在所述复合层上形成贯通孔，所述贯通孔贯通所述第一表面及所述第二表面；forming a through hole on the composite layer, the through hole passing through the first surface and the second surface;
    在所述贯通孔内设置导电连接件；及providing a conductive connector in the through hole; and
    在所述复合层的所述第二表面侧设置第二金属层，得到电极极片；其中，所述第一金属层覆盖所述贯通孔于所述第一表面侧的开口，所述第二金属层覆盖所述贯通孔于所述第二表面侧的开口，且，所述第一金属层和所述第二金属层均与所述导电连接件相接触；所述第一金属层与所述贯通孔对应的位置或所述第二金属层与所述贯通孔对应的位置用于焊接极耳。A second metal layer is provided on the second surface side of the composite layer to obtain an electrode sheet; wherein, the first metal layer covers the opening of the through hole on the first surface side, and the second The metal layer covers the opening of the through hole on the second surface side, and both the first metal layer and the second metal layer are in contact with the conductive connector; the first metal layer and the The position corresponding to the through hole or the position of the second metal layer corresponding to the through hole is used for welding tabs.
  19. 一种电池，其特征在于，所述电池包括正极极片、负极极片、隔膜及电解液，其中，所述正极极片及负极极片为如权利要求1至13任一项所述的电极极片，或，如权利要求16至18任一项所述的电极极片的制备方法制备得到的电极极片。A battery, characterized in that the battery comprises a positive pole piece, a negative pole piece, a separator, and an electrolyte, wherein the positive pole piece and the negative pole piece are electrodes according to any one of claims 1 to 13 A pole piece, or an electrode pole piece prepared by the method for preparing an electrode pole piece according to any one of claims 16 to 18.
  20. 一种电子设备，其特征在于，包括电池盖及收容于所述电池盖内的如权利要求19所述的电池。An electronic device, characterized by comprising a battery cover and the battery according to claim 19 accommodated in the battery cover.
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