WO2022222946A1 - Current collector and graphite anode bipolar lithium ion battery - Google Patents

Current collector and graphite anode bipolar lithium ion battery Download PDF

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WO2022222946A1
WO2022222946A1 PCT/CN2022/087851 CN2022087851W WO2022222946A1 WO 2022222946 A1 WO2022222946 A1 WO 2022222946A1 CN 2022087851 W CN2022087851 W CN 2022087851W WO 2022222946 A1 WO2022222946 A1 WO 2022222946A1
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plastic film
plating layer
metal plating
current collector
metal
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PCT/CN2022/087851
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French (fr)
Chinese (zh)
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沈晞
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沈晞
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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
    • H01M4/64—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
    • 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
    • H01M4/64—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
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/029—Bipolar electrodes
    • 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 application belongs to the technical field of lithium ion batteries, and relates to a current collector and a graphite anode bipolar lithium ion battery.
  • Lithium-ion batteries have the advantages of large capacity, high working voltage, strong charge retention ability and high safety, and have been widely used in consumer electronic products and electric vehicles. With the development of new energy vehicles, people have put forward higher requirements for the cruising range of new energy vehicles.
  • the current mainstream bipolar lithium-ion battery is a positive electrode and a negative electrode on both sides of the current collector, the separator is placed in the middle of the adjacent bipolar electrodes, and the electrolyte is filled, and a plurality of energy storage devices are stacked.
  • bipolar lithium-ion batteries are prone to pores, and are prone to the risk of oxidation and lithium intercalation.
  • the technical problem to be solved by the present application is to provide a current collector and a graphite anode bipolar lithium ion battery for the problem that the existing bipolar lithium ion battery is prone to the risk of oxidation and lithium intercalation.
  • the present application provides a current collector.
  • the current collector includes a first metal plating layer, a first plastic film, a second plastic film and a second metal plating layer, the first plastic film and the second plastic film are spaced apart, and the first end of the first plastic film connected to one side of the second metal plating layer, the first end of the second plastic film is connected to the other side of the second metal plating layer, and the second metal plating layer covers the first plastic film and the The lower surface of the second plastic film, the second metal plating layer is in contact with the lower surface of the first metal plating layer, the second end of the first plastic film protrudes from the first metal plating layer and the second metal plating layer , the second end of the second plastic film protrudes from the first metal plating layer and the second metal plating layer.
  • the first metal plating layer is a copper plating layer.
  • the copper coating is a graphite-doped coating.
  • the second metal coating has a stepped section and a flat section, the stepped section is connected to the lower surface of the first metal coating, and the first end of the first plastic film is connected to the stepped section one side of the second plastic film, the first end of the second plastic film is connected to the other side of the stepped section, and the stepped section has the same thickness as the first plastic film and the second plastic film.
  • the thickness of the first metal plating layer is 0.5-2 microns
  • the second metal plating layer is an aluminum plating layer and forms a bipolar current collector with the first metal plating layer, and the thickness of the plane section is 0.5-2 microns.
  • the first plastic film and the second plastic film are PET films.
  • the first metal coating is covered on the upper surfaces of the first plastic film and the second plastic film by evaporation;
  • the second metal plating layer is covered on the lower surfaces of the first plastic film and the second plastic film by means of evaporation.
  • the thickness of the first plastic film is 1-50 microns
  • the thickness of the second plastic film is 1-50 microns
  • the thickness of the stepped section is 1-50 microns
  • the thickness of the flat section is 1-50 microns. 1-50 microns.
  • the current collector provided by the embodiment of the present application includes a first metal coating, a first plastic film, a second plastic film and a second metal coating, the first plastic film and the second plastic film are arranged at intervals, and the first plastic film and the second plastic film are spaced apart.
  • the first end of the plastic film is connected to one side of the second metal coating, the first end of the second plastic film is connected to the other side of the second metal coating, and the second metal coating covers the lower surfaces of the first plastic film and the second plastic film, the second metal coating is in contact with the lower surface of the first metal coating, and the second end of the first plastic film protrudes from the first metal Coating layer and second metal coating layer, the second end of the second plastic film protrudes from the first metal coating layer and the second metal coating layer;
  • the current collector of the present application, the first plastic film and the second plastic film on both sides can be used For encapsulation between current collectors; the bipolar battery produced is lighter in weight, without the risk of oxidation and lithium intercalation.
  • the embodiments of the present application also provide a graphite anode bipolar lithium ion battery, which includes the above current collector.
  • FIG. 1 is a schematic diagram of a current collector provided by an embodiment of the present application. invention
  • the current collector provided by the embodiment of the present application includes a first metal coating 2 , a first plastic film 5 , a second plastic film 6 and a second metal coating 7 .
  • the first plastic film 5 and the The second plastic films 6 are arranged at intervals, the first end of the first plastic film 5 is connected to one side of the second metal plating layer 7 , and the first end of the second plastic film 6 is connected to the second metal
  • the second metal plating layer 7 covers the lower surfaces of the first plastic film 5 and the second plastic film 6, and the second metal plating layer 7 and the lower surface of the first metal plating layer 2.
  • the surfaces are in contact with each other, the second end of the first plastic film 5 protrudes from the first metal coating 2 and the second metal coating 7, and the second end of the second plastic film 6 protrudes from the first metal coating 2 and the second metal coating 7 .
  • the first plastic film 5 and the second plastic film 6 on both sides can be used for encapsulation between current collectors; the bipolar battery produced is lighter in weight, etc.
  • the first metal plating layer 2 is a copper plating layer.
  • the copper coating is a graphite-doped coating.
  • the second metal plating layer 7 has a stepped section 71 and a flat section 72 , the stepped section 71 is in contact with the lower surface of the first metal plating layer 2 , and the first plastic film 5 has a lower surface.
  • One end is connected to one side of the stepped section 71 , the first end of the second plastic film 6 is connected to the other side of the stepped section 71 , the stepped section 71 is connected to the first plastic film 5 and the other side of the stepped section 71 .
  • the thickness of the second plastic film 6 is the same.
  • the thickness of the first metal plating layer 2 is 0.5-2 microns.
  • the second metal plating layer 7 is an aluminum plating layer and forms a bipolar current collector with the first metal plating layer 2 , and the thickness of the plane section 72 is 0.5-2 ⁇ m.
  • the first plastic film 5 and the second plastic film 6 are PET films.
  • the first metal plating layer 2 is covered on the upper surfaces of the first plastic film 5 and the second plastic film 6 by means of evaporation.
  • the second metal plating layer 7 is covered on the lower surfaces of the first plastic film 5 and the second plastic film 6 by means of evaporation.
  • the thickness of the first plastic film 5 is 1-50 microns
  • the thickness of the second plastic film 6 is 1-50 microns
  • the thickness of the stepped section 71 is 1-50 microns
  • the thickness of the flat section 72 is 1-50 microns.
  • the first metal plating layer and the second metal plating layer may be the same metal or different metals.
  • the first plastic film and the second plastic film are arranged at intervals, the first end of the first plastic film is connected to one side of the second metal plating layer, and the first plastic film is The first end of the two plastic films is connected to the other side of the second metal coating, the second metal coating covers the lower surfaces of the first plastic film and the second plastic film, and the second metal coating and The lower surfaces of the first metal plating layer are in contact with each other, the second end of the first plastic film protrudes from the first metal plating layer and the second metal plating layer, and the second end of the second plastic film protrudes from the The first metal plating layer and the second metal plating layer; the current collector of the present application, the first plastic film and the second plastic film on both sides can be used for packaging between the current collectors; the bipolar battery produced is lighter in weight, free from oxidation and embeddedness. Lithium risk.
  • an embodiment of the present application further provides a graphite anode bipolar lithium ion battery, which includes the current collector of the above embodiment.

Abstract

The present application belongs to the technical field of lithium ion batteries, and relates to a current collector and a graphite anode bipolar lithium ion battery. The current collector comprises a first metal plating layer, a first plastic thin film, a second plastic thin film and a second metal plating layer, wherein a first end of the first plastic thin film is connected to one side of the second metal plating layer, a first end of the second plastic thin film is connected to the other side of the second metal plating layer, the second metal plating layer covers lower surfaces of the first plastic thin film and the second plastic thin film, the second metal plating layer is connected to a lower surface of the first metal plating layer, a second end of the first plastic thin film protrudes from the first metal plating layer and the second metal plating layer, and a second end of the second plastic thin film protrudes from the first metal plating layer and the second metal plating layer. The current collector, and the first plastic thin film and second plastic thin film at two sides of the current collector of the present application may be used for packaging between current collectors. The fabricated bipolar battery is more lightweight, and free from oxidation and lithium intercalation risks.

Description

一种集流体及石墨阳极双极锂离子电池A current collector and graphite anode bipolar lithium-ion battery
本申请要求于_ 2021_年_ 4_月_ 22_日提交中国专利局、申请号为_ 202110435049.X，发明名称为“ 一种集流体及石墨阳极双极锂离子电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。 This application requires a Chinese patent application filed with the Chinese Patent Office on _2021_year_4_month_22_ , the application number is _202110435049.X , and the invention name is "a current collector and graphite anode bipolar lithium-ion battery " , the entire contents of which are incorporated herein by reference.
技术领域technical field
本申请属于锂离子电池技术领域，涉及一种集流体及石墨阳极双极锂离子电池。The application belongs to the technical field of lithium ion batteries, and relates to a current collector and a graphite anode bipolar lithium ion battery.
背景技术Background technique
锂离子电池具有容量大、工作电压高、荷电保持能力强及安全性高等优点，已被广泛运用于消费类电子产品及电动汽车中。随着新能源汽车的发展，人们对新能源汽车的续航里程提出了更高的要求。Lithium-ion batteries have the advantages of large capacity, high working voltage, strong charge retention ability and high safety, and have been widely used in consumer electronic products and electric vehicles. With the development of new energy vehicles, people have put forward higher requirements for the cruising range of new energy vehicles.
目前主流的双极锂离子电池是在集流体两侧分别形成正极和负极，隔膜放在相邻双极电极中间，加注电解液，多个层叠而成的储能装置。The current mainstream bipolar lithium-ion battery is a positive electrode and a negative electrode on both sides of the current collector, the separator is placed in the middle of the adjacent bipolar electrodes, and the electrolyte is filled, and a plurality of energy storage devices are stacked.
但是，此种双极锂离子电池容易产生孔洞，同时容易产生氧化及嵌锂风险。However, such bipolar lithium-ion batteries are prone to pores, and are prone to the risk of oxidation and lithium intercalation.
发明内容SUMMARY OF THE INVENTION
本申请所要解决的技术问题是：针对现有的双极锂离子电池容易产生氧化及嵌锂风险的问题，提供一种集流体及石墨阳极双极锂离子电池。The technical problem to be solved by the present application is to provide a current collector and a graphite anode bipolar lithium ion battery for the problem that the existing bipolar lithium ion battery is prone to the risk of oxidation and lithium intercalation.
为解决上述技术问题，一方面，本申请提供了一种集流体。该集流体包括第一金属镀层、第一塑料薄膜、第二塑料薄膜及第二金属镀层，所述第一塑料薄膜与所述第二塑料薄膜间隔设置，所述第一塑料薄膜的第一端连接于所述第二金属镀层的一侧，所述第二塑料薄膜的第一端连接于所述第二金属镀层的另 一侧，所述第二金属镀层覆盖于所述第一塑料薄膜及第二塑料薄膜的下表面，所述第二金属镀层与所述第一金属镀层的下表面相接，所述第一塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层，所述第二塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层。In order to solve the above technical problems, on the one hand, the present application provides a current collector. The current collector includes a first metal plating layer, a first plastic film, a second plastic film and a second metal plating layer, the first plastic film and the second plastic film are spaced apart, and the first end of the first plastic film connected to one side of the second metal plating layer, the first end of the second plastic film is connected to the other side of the second metal plating layer, and the second metal plating layer covers the first plastic film and the The lower surface of the second plastic film, the second metal plating layer is in contact with the lower surface of the first metal plating layer, the second end of the first plastic film protrudes from the first metal plating layer and the second metal plating layer , the second end of the second plastic film protrudes from the first metal plating layer and the second metal plating layer.
可选地，所述第一金属镀层为铜镀层。Optionally, the first metal plating layer is a copper plating layer.
可选地，所述铜镀层为掺杂石墨的镀层。Optionally, the copper coating is a graphite-doped coating.
可选地，所述第二金属镀层具有阶梯段及平面段，所述阶梯段与所述第一金属镀层的下表面相接，所述第一塑料薄膜的第一端连接于所述阶梯段的一侧，所述第二塑料薄膜的第一端连接于所述阶梯段的另一侧，所述阶梯段与所述第一塑料薄膜及第二塑料薄膜的厚度相同。Optionally, the second metal coating has a stepped section and a flat section, the stepped section is connected to the lower surface of the first metal coating, and the first end of the first plastic film is connected to the stepped section one side of the second plastic film, the first end of the second plastic film is connected to the other side of the stepped section, and the stepped section has the same thickness as the first plastic film and the second plastic film.
可选地，所述第一金属镀层的厚度为0.5-2微米；Optionally, the thickness of the first metal plating layer is 0.5-2 microns;
所述第二金属镀层为铝镀层并与所述第一金属镀层构成双极集流体，所述平面段的厚度为0.5-2微米。The second metal plating layer is an aluminum plating layer and forms a bipolar current collector with the first metal plating layer, and the thickness of the plane section is 0.5-2 microns.
可选地，所述第一塑料薄膜及第二塑料薄膜为PET薄膜。Optionally, the first plastic film and the second plastic film are PET films.
可选地，所述第一金属镀层采用蒸镀的方式覆盖于所述第一塑料薄膜及第二塑料薄膜的上表面；Optionally, the first metal coating is covered on the upper surfaces of the first plastic film and the second plastic film by evaporation;
所述第二金属镀层采用蒸镀的方式覆盖于所述第一塑料薄膜及第二塑料薄膜的下表面。The second metal plating layer is covered on the lower surfaces of the first plastic film and the second plastic film by means of evaporation.
可选地，所述第一塑料薄膜的厚度为1-50微米，所述第二塑料薄膜的厚度为1-50微米，所述阶梯段的厚度为1-50微米，所述平面段的厚度为1-50微米。Optionally, the thickness of the first plastic film is 1-50 microns, the thickness of the second plastic film is 1-50 microns, the thickness of the stepped section is 1-50 microns, and the thickness of the flat section is 1-50 microns. 1-50 microns.
本申请实施例提供的集流体，包括第一金属镀层、第一塑料薄膜、第二塑料薄膜及第二金属镀层，所述第一塑料薄膜与所述第二塑料薄膜间隔设置，所述第一塑料薄膜的第一端连接于所述第二金属镀层的一侧，所述第二塑料薄膜的第一端连接于所述第二金属镀层的另一侧，所述第二金属镀层覆盖于所述第一塑料薄膜及第二塑料薄膜的下表面，所述第二金属镀层与所述第一金属镀层的下表面相接，所述第一塑料薄膜的第二端突出于所述第一金属镀层及第二金 属镀层，所述第二塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层；本申请的集流体，两侧的第一塑料薄膜和第二塑料薄膜可用于集流体之间的封装；制作的双极电池重量更轻，无氧化和嵌锂风险。The current collector provided by the embodiment of the present application includes a first metal coating, a first plastic film, a second plastic film and a second metal coating, the first plastic film and the second plastic film are arranged at intervals, and the first plastic film and the second plastic film are spaced apart. The first end of the plastic film is connected to one side of the second metal coating, the first end of the second plastic film is connected to the other side of the second metal coating, and the second metal coating covers the the lower surfaces of the first plastic film and the second plastic film, the second metal coating is in contact with the lower surface of the first metal coating, and the second end of the first plastic film protrudes from the first metal Coating layer and second metal coating layer, the second end of the second plastic film protrudes from the first metal coating layer and the second metal coating layer; the current collector of the present application, the first plastic film and the second plastic film on both sides can be used For encapsulation between current collectors; the bipolar battery produced is lighter in weight, without the risk of oxidation and lithium intercalation.
另一方面，本申请实施例还提供了一种石墨阳极双极锂离子电池，其包括上述的集流体。On the other hand, the embodiments of the present application also provide a graphite anode bipolar lithium ion battery, which includes the above current collector.
附图说明Description of drawings
图1是本申请一实施例提供的集流体示意图。发明FIG. 1 is a schematic diagram of a current collector provided by an embodiment of the present application. invention
说明书中的附图标记如下：The reference numbers in the description are as follows:
2、第一金属镀层；5、第一塑料薄膜；6、第二塑料薄膜；7、第二金属镀层；71、阶梯段；72、平面段。2. The first metal coating; 5. The first plastic film; 6. The second plastic film; 7. The second metal coating; 71, the stepped section; 72, the plane section.
具体实施方式Detailed ways
为了使本申请所解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.
如图1所示，本申请实施例提供的集流体，包括第一金属镀层2、第一塑料薄膜5、第二塑料薄膜6及第二金属镀层7，所述第一塑料薄膜5与所述第二塑料薄膜6间隔设置，所述第一塑料薄膜5的第一端连接于所述第二金属镀层7的一侧，所述第二塑料薄膜6的第一端连接于所述第二金属镀层7的另一侧，所述第二金属镀层7覆盖于所述第一塑料薄膜5及第二塑料薄膜6的下表面，所述第二金属镀层7与所述第一金属镀层2的下表面相接，所述第一塑料薄膜5的第二端突出于所述第一金属镀层2及第二金属镀层7，所述第二塑料薄膜6的第二端突出于所述第一金属镀层2及第二金属镀层7。As shown in FIG. 1 , the current collector provided by the embodiment of the present application includes a first metal coating 2 , a first plastic film 5 , a second plastic film 6 and a second metal coating 7 . The first plastic film 5 and the The second plastic films 6 are arranged at intervals, the first end of the first plastic film 5 is connected to one side of the second metal plating layer 7 , and the first end of the second plastic film 6 is connected to the second metal On the other side of the plating layer 7, the second metal plating layer 7 covers the lower surfaces of the first plastic film 5 and the second plastic film 6, and the second metal plating layer 7 and the lower surface of the first metal plating layer 2. The surfaces are in contact with each other, the second end of the first plastic film 5 protrudes from the first metal coating 2 and the second metal coating 7, and the second end of the second plastic film 6 protrudes from the first metal coating 2 and the second metal coating 7 .
两侧的第一塑料薄膜5和第二塑料薄膜6可用于集流体之间的封装；制作的双极电池重量更轻等。The first plastic film 5 and the second plastic film 6 on both sides can be used for encapsulation between current collectors; the bipolar battery produced is lighter in weight, etc.
在一实施例中，所述第一金属镀层2为铜镀层。In one embodiment, the first metal plating layer 2 is a copper plating layer.
在一实施例中，所述铜镀层为掺杂石墨的镀层。In one embodiment, the copper coating is a graphite-doped coating.
在一实施例中，所述第二金属镀层7具有阶梯段71及平面段72，所述阶梯段71与所述第一金属镀层2的下表面相接，所述第一塑料薄膜5的第一端连接于所述阶梯段71的一侧，所述第二塑料薄膜6的第一端连接于所述阶梯段71的另一侧，所述阶梯段71与所述第一塑料薄膜5及第二塑料薄膜6的厚度相同。In one embodiment, the second metal plating layer 7 has a stepped section 71 and a flat section 72 , the stepped section 71 is in contact with the lower surface of the first metal plating layer 2 , and the first plastic film 5 has a lower surface. One end is connected to one side of the stepped section 71 , the first end of the second plastic film 6 is connected to the other side of the stepped section 71 , the stepped section 71 is connected to the first plastic film 5 and the other side of the stepped section 71 . The thickness of the second plastic film 6 is the same.
在一实施例中，所述第一金属镀层2的厚度为0.5-2微米。In one embodiment, the thickness of the first metal plating layer 2 is 0.5-2 microns.
所述第二金属镀层7为铝镀层并与所述第一金属镀层2构成双极集流体，所述平面段72的厚度为0.5-2微米。The second metal plating layer 7 is an aluminum plating layer and forms a bipolar current collector with the first metal plating layer 2 , and the thickness of the plane section 72 is 0.5-2 μm.
在一实施例中，所述第一塑料薄膜5及第二塑料薄膜6为PET薄膜。In one embodiment, the first plastic film 5 and the second plastic film 6 are PET films.
在一实施例中，所述第一金属镀层2采用蒸镀的方式覆盖于所述第一塑料薄膜5及第二塑料薄膜6的上表面。In one embodiment, the first metal plating layer 2 is covered on the upper surfaces of the first plastic film 5 and the second plastic film 6 by means of evaporation.
所述第二金属镀层7采用蒸镀的方式覆盖于所述第一塑料薄膜5及第二塑料薄膜6的下表面。The second metal plating layer 7 is covered on the lower surfaces of the first plastic film 5 and the second plastic film 6 by means of evaporation.
在一实施例中，所述第一塑料薄膜5的厚度为1-50微米，所述第二塑料薄膜6的厚度为1-50微米，所述阶梯段71的厚度为1-50微米，所述平面段72的厚度为1-50微米。In one embodiment, the thickness of the first plastic film 5 is 1-50 microns, the thickness of the second plastic film 6 is 1-50 microns, and the thickness of the stepped section 71 is 1-50 microns, so The thickness of the flat section 72 is 1-50 microns.
可选地，第一金属镀层及第二金属镀层可为同种金属，也可为不同种金属。Optionally, the first metal plating layer and the second metal plating layer may be the same metal or different metals.
根据本申请实施例的集流体，所述第一塑料薄膜与所述第二塑料薄膜间隔设置，所述第一塑料薄膜的第一端连接于所述第二金属镀层的一侧，所述第二塑料薄膜的第一端连接于所述第二金属镀层的另一侧，所述第二金属镀层覆盖于所述第一塑料薄膜及第二塑料薄膜的下表面，所述第二金属镀层与所述第一金属镀层的下表面相接，所述第一塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层，所述第二塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层；本申请的集流体，两侧的第一塑料薄膜和第二塑料薄膜可用于集流体之间的封装；制作的双极电池重量更轻，无氧化和嵌锂风险。According to the current collector of the embodiment of the present application, the first plastic film and the second plastic film are arranged at intervals, the first end of the first plastic film is connected to one side of the second metal plating layer, and the first plastic film is The first end of the two plastic films is connected to the other side of the second metal coating, the second metal coating covers the lower surfaces of the first plastic film and the second plastic film, and the second metal coating and The lower surfaces of the first metal plating layer are in contact with each other, the second end of the first plastic film protrudes from the first metal plating layer and the second metal plating layer, and the second end of the second plastic film protrudes from the The first metal plating layer and the second metal plating layer; the current collector of the present application, the first plastic film and the second plastic film on both sides can be used for packaging between the current collectors; the bipolar battery produced is lighter in weight, free from oxidation and embeddedness. Lithium risk.
另外，本申请一实施例还提供一种石墨阳极双极锂离子电池，其包括上述实施例的集流体。In addition, an embodiment of the present application further provides a graphite anode bipolar lithium ion battery, which includes the current collector of the above embodiment.
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (9)

  1. 一种集流体，其中，包括第一金属镀层、第一塑料薄膜、第二塑料薄膜及第二金属镀层，所述第一塑料薄膜与所述第二塑料薄膜间隔设置，所述第一塑料薄膜的第一端连接于所述第二金属镀层的一侧，所述第二塑料薄膜的第一端连接于所述第二金属镀层的另一侧，所述第二金属镀层覆盖于所述第一塑料薄膜及第二塑料薄膜的下表面，所述第二金属镀层与所述第一金属镀层的下表面相接，所述第一塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层，所述第二塑料薄膜的第二端突出于所述第一金属镀层及第二金属镀层。A current collector, comprising a first metal coating, a first plastic film, a second plastic film and a second metal coating, the first plastic film and the second plastic film are spaced apart, and the first plastic film The first end of the second metal coating is connected to one side of the second metal coating, the first end of the second plastic film is connected to the other side of the second metal coating, and the second metal coating covers the first A plastic film and a lower surface of a second plastic film, the second metal coating is in contact with the lower surface of the first metal coating, and the second end of the first plastic film protrudes from the first metal coating and The second metal plating layer, the second end of the second plastic film protrudes from the first metal plating layer and the second metal plating layer.
  2. 根据权利要求1所述的集流体，其中，所述第一金属镀层为铜镀层。The current collector of claim 1, wherein the first metal coating is a copper coating.
  3. 根据权利要求2所述的集流体，其中，所述铜镀层为掺杂石墨的镀层。The current collector of claim 2, wherein the copper coating is a graphite-doped coating.
  4. 根据权利要求1所述的集流体，其中，所述第二金属镀层具有阶梯段及平面段，所述阶梯段与所述第一金属镀层的下表面相接，所述第一塑料薄膜的第一端连接于所述阶梯段的一侧，所述第二塑料薄膜的第一端连接于所述阶梯段的另一侧，所述阶梯段与所述第一塑料薄膜及第二塑料薄膜的厚度相同。The current collector according to claim 1, wherein the second metal plating layer has a stepped section and a flat section, the stepped section is in contact with the lower surface of the first metal plating layer, and the first plastic film has a second section. One end is connected to one side of the stepped section, the first end of the second plastic film is connected to the other side of the stepped section, and the stepped section is connected to the first plastic film and the second plastic film. Same thickness.
  5. 根据权利要求4所述的集流体，其中，所述第一金属镀层的厚度为0.5-2微米；The current collector according to claim 4, wherein the thickness of the first metal plating layer is 0.5-2 microns;
    所述第二金属镀层为铝镀层并与所述第一金属镀层构成双极集流体，所述平面段的厚度为0.5-2微米。The second metal plating layer is an aluminum plating layer and forms a bipolar current collector with the first metal plating layer, and the thickness of the plane section is 0.5-2 microns.
  6. 根据权利要求1所述的集流体，其中，所述第一塑料薄膜及第二塑料薄膜为PET薄膜。The current collector of claim 1, wherein the first plastic film and the second plastic film are PET films.
  7. 根据权利要求1所述的集流体，其中，所述第一金属镀层采用蒸镀的方式覆盖于所述第一塑料薄膜及第二塑料薄膜的上表面；The current collector according to claim 1, wherein the first metal plating layer is covered on the upper surfaces of the first plastic film and the second plastic film by means of evaporation;
    所述第二金属镀层采用蒸镀的方式覆盖于所述第一塑料薄膜及第二塑料薄膜的下表面。The second metal plating layer is covered on the lower surfaces of the first plastic film and the second plastic film by means of evaporation.
  8. 根据权利要求4所述的集流体，其中，所述第一塑料薄膜的厚度为1-50微米，所述第二塑料薄膜的厚度为1-50微米，所述阶梯段的厚度为1-50微米，所述平面段的厚度为1-50微米。The current collector according to claim 4, wherein the thickness of the first plastic film is 1-50 microns, the thickness of the second plastic film is 1-50 microns, and the thickness of the step section is 1-50 microns microns, and the thickness of the planar segment is 1-50 microns.
  9. 一种石墨阳极双极锂离子电池，其中，包括权利要求1-9任意一项所述的集流体。A graphite anode bipolar lithium-ion battery, comprising the current collector according to any one of claims 1-9.
PCT/CN2022/087851 2021-04-22 2022-04-20 Current collector and graphite anode bipolar lithium ion battery WO2022222946A1 (en)

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