WO2022188894A1 - Current collector and lithium-ion battery - Google Patents

Current collector and lithium-ion battery Download PDF

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Publication number
WO2022188894A1
WO2022188894A1 PCT/CN2022/087856 CN2022087856W WO2022188894A1 WO 2022188894 A1 WO2022188894 A1 WO 2022188894A1 CN 2022087856 W CN2022087856 W CN 2022087856W WO 2022188894 A1 WO2022188894 A1 WO 2022188894A1
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tab
plastic film
plating layer
metal plating
current collector
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PCT/CN2022/087856
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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
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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 belongs to the technical field of lithium ion batteries, and relates to a current collector and a 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. Therefore, improving the energy density of lithium-ion batteries is the main development direction of lithium-ion batteries. Reducing the weight of current collectors is one of the directions to improve lithium-ion energy density. It does not bring safety risks while improving energy density. Reducing the production cost of the battery has a broader application prospect.
  • the positive current collector of the mainstream lithium ion battery is aluminum foil
  • the negative electrode current collector is copper foil.
  • the thickness of the metal foil is reduced to a certain extent, its mechanical strength is reduced, and the processing difficulty is also greatly increased.
  • some patents propose to reduce the thickness of the current collector by plating copper or aluminum on the plastic film.
  • the technical problem to be solved by the present application is to provide a current collector and a lithium ion battery in view of the problem that the existing current collector may increase the internal resistance of the battery due to poor welding during the assembly process.
  • the present application provides a current collector.
  • the current collector includes a plastic film, a first metal coating, a second metal coating, a second tab and a first tab, one end of the first tab is connected to the first side edge of the upper surface of the plastic film, The other end of the first tab protrudes from the plastic film, the first metal plating layer covers the upper surface of the plastic film, and the first metal plating layer is close to one end of the first tab and the The first polar ears are connected;
  • One end of the second tab is connected to the second side edge of the lower surface of the plastic film, the other end of the second tab protrudes from the plastic film, and the second metal plating layer covers the plastic film. On the lower surface of the film, one end of the second metal plating layer close to the second tab is connected to the second tab;
  • the materials of the first metal plating layer, the second metal plating layer, the first tab and the second tab are the same.
  • the first metal plating layer and the second metal plating layer are aluminum plating layers
  • the first tab and the second tab are aluminum foil
  • the current collector is a positive electrode current collector.
  • the first metal plating layer and the second metal plating layer are copper plating layers
  • the first tab and the second tab are copper foil
  • the current collector is a negative electrode current collector.
  • the thickness of the plastic film is 1-50 microns;
  • the thickness of the first metal plating layer is 0.5-1 ⁇ m, and the thickness of the second metal plating layer is 0.5-1 ⁇ m.
  • the first metal coating layer is covered on the upper surface of the plastic film by means of evaporation; the second metal coating layer is covered on the lower surface of the plastic film by means of evaporation.
  • one end of the first tab is connected to the first side edge of the upper surface of the plastic film by rolling, electrostatic or plasma adsorption;
  • One end of the second tab is connected to the second side edge of the lower surface of the plastic film by rolling, electrostatic or plasma adsorption.
  • the current collector provided by the embodiment of the present application includes a plastic film, a first metal coating, a second metal coating, a second tab and a first tab, and one end of the first tab is connected to the upper surface of the plastic film the first side edge, the other end of the first tab protrudes from the plastic film, the first metal coating covers the upper surface of the plastic film, and the first metal coating is close to the first pole
  • One end of the lug is connected to the first lug
  • one end of the second lug is connected to the second side edge of the lower surface of the plastic film, and the other end of the second lug protrudes from the plastic film film
  • the second metal plating layer covers the lower surface of the plastic film
  • the second metal plating layer covers the end of the plastic film close to the first tab
  • the second metal plating layer is close to the first tab
  • One end of the diode lug is connected to the second lug; in the current collector of the present application, the lug is made of metal, which will not cause poor welding; PET and other resin
  • an embodiment of the present application also provides a 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.
  • the current collector provided in the embodiment of the present application includes a plastic film 1, a first metal coating 2, a second metal coating, a second tab 5 and a first tab 4.
  • the first tab One end of 4 is connected to the first side edge of the upper surface of the plastic film 1, the other end of the first tab 4 protrudes from the plastic film 1, and the first metal coating 2 covers the plastic film. 1, the end of the first metal plating layer 2 close to the first tab 4 is in contact with the first tab 4.
  • One end of the second tab 5 is connected to the second side edge of the lower surface of the plastic film 1 , the other end of the second tab 5 protrudes from the plastic film 1 , and the second metal coating 3 Covered on the lower surface of the plastic film 1 , one end of the second metal plating layer 3 close to the second tab 5 is connected to the second tab 5 .
  • the materials of the first metal plating layer 2 , the second metal plating layer 3 , the first tab 4 and the second tab 5 are the same.
  • the material of the plastic film 1 includes, but is not limited to, PET, OPP, PI, CPP, PVC, and the like.
  • the first metal plating layer 2 and the second metal plating layer 3 are aluminum plating layers
  • the first tab 4 and the second tab 5 are aluminum foil
  • the current collector is a positive electrode current collector.
  • the first metal plating layer 2 and the second metal plating layer 3 are copper plating layers
  • the first tab 4 and the second tab 5 are copper foil
  • the current collector is a negative electrode current collector.
  • the first metal plating layer 2 and the second metal plating layer 3 may be of the same kind of metal, or may be of different kinds of metals.
  • the thickness of the plastic film 1 is 1-50 microns.
  • the thickness of the first metal plating layer 2 is 0.5-1 ⁇ m, and the thickness of the second metal plating layer 3 is 0.5-1 ⁇ m.
  • the first metal plating layer 2 is covered on the upper surface of the plastic film 1 by means of evaporation.
  • the second metal plating layer 3 is covered on the lower surface of the plastic film 1 by means of evaporation.
  • one end of the first tab 4 is connected to the first side edge of the upper surface of the plastic film 1 by rolling, electrostatic or plasma adsorption.
  • One end of the second tab 5 is connected to the second side edge of the lower surface of the plastic film 1 by rolling, electrostatic or plasma adsorption.
  • one end of the first tab is connected to the first side edge of the upper surface of the plastic film, the other end of the first tab protrudes from the plastic film, the A first metal plating layer covers the upper surface of the plastic film, one end of the first metal plating layer close to the first tab is connected to the first tab, and one end of the second tab is connected to the first tab.
  • the tab is Metal, will not cause poor welding; PET and other resins have high tensile strength and are not easy to break; the evaporation area of the metal coating is controllable; the evaporation layer is in good contact with the tab drainage part; the energy density is increased by 10%.
  • an embodiment of the present application further provides a lithium ion battery including the current collector of the above embodiment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

A current collector and a lithium ion battery, the current collector comprising a plastic film (1), a first metal plating layer (2), a second metal plating layer (3), a first electrode tab (4) and a second electrode tab (5). One end of the first electrode tab (4) is connected to a first side edge of the upper surface of the plastic film (1), and the other end of the first electrode tab (4) protrudes from the plastic film (1). The first metal plating layer (2) covers the upper surface of the plastic film (1), and the end of the first metal plating layer (2) close to the first electrode tab (4) is connected to the first electrode tab (4). One end of the second electrode tab (5) is connected to a second side edge of the lower surface of the plastic film (1), and the other end of the second electrode tab (5) protrudes from the plastic film (1). The second metal plating layer (3) covers the lower surface of the plastic film (1), and the end of the second metal plating layer (3) close to the second electrode tab (5) is connected to the second electrode tab (5). In the current collector, the metal plating layers have good contact with the electrode tabs, thereby ensuring the conductivity of the current collector. The tensile strength of the plastic film is high, thus the current collector is not easy to break, and the energy density is improved by 10%.

Description

集流体及锂离子电池Current collectors and lithium-ion batteries
本申请要求以下中国专利申请的优先权：于 2021年 3月 8日提交中国专利局、申请号为 202110249880.6，发明名称为“ 集流体及锂离子电池”的中国专利申请，以及，于 2021年 4月 25日提交中国专利局、申请号为 202110448954.9，发明名称为“ 集流体及锂离子电池”的中国专利申请，其全部内容通过引用结合在本申请中。 This application claims the priority of the following Chinese patent applications: filed with the Chinese Patent Office on March 8 , 2021, application number 202110249880.6 , and the Chinese patent application entitled " Current collector and lithium-ion battery ", and, in 2021 On April 25 , the Chinese patent application with the application number of 202110448954.9 and the invention titled "Current collector and lithium ion battery " was submitted to the Chinese Patent Office, the entire contents of which are incorporated into this application by reference.
技术领域technical field
本申请属于锂离子电池技术领域，涉及一种集流体及锂离子电池。The present application belongs to the technical field of lithium ion batteries, and relates to a current collector and a 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。为此，提高锂离子电池的能量密度是锂离子电池主要的发展方向，减轻集流体的重量作为提高锂离子能量密度的方向之一，在提高能量密度的同时并没有带来安全风险，还可以降低电池的生产成本，有更加广阔的应用前景。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. Therefore, improving the energy density of lithium-ion batteries is the main development direction of lithium-ion batteries. Reducing the weight of current collectors is one of the directions to improve lithium-ion energy density. It does not bring safety risks while improving energy density. Reducing the production cost of the battery has a broader application prospect.
目前主流的锂离子电池的正极集流体为铝箔，负极集流体为铜箔。当金属箔材的厚度降低到一定的程度后，其机械强度降低，加工难度也大大增加。为了保证其机械强度并降低厚度，有专利提出通过在塑料膜上镀铜或铝的方法来减轻集流体厚度。At present, the positive current collector of the mainstream lithium ion battery is aluminum foil, and the negative electrode current collector is copper foil. When the thickness of the metal foil is reduced to a certain extent, its mechanical strength is reduced, and the processing difficulty is also greatly increased. In order to ensure its mechanical strength and reduce the thickness, some patents propose to reduce the thickness of the current collector by plating copper or aluminum on the plastic film.
此方法虽然起到了减轻厚度的作用，但是由于塑料膜会对装配过程中的焊接造成不良的影响，可能造成电池内阻增加。Although this method can reduce the thickness, the internal resistance of the battery may increase because the plastic film will adversely affect the welding in the assembly process.
发明内容SUMMARY OF THE INVENTION
本申请所要解决的技术问题是：针对现有的集流体由于装配过程中的焊接不良，可能造成电池内阻增加的问题，提供一种集流体及锂离子电池。The technical problem to be solved by the present application is to provide a current collector and a lithium ion battery in view of the problem that the existing current collector may increase the internal resistance of the battery due to poor welding during the assembly process.
为解决上述技术问题，一方面，本申请提供了一种集流体。该集流体包括塑料薄膜、第一金属镀层、第二金属镀层、第二极耳及第一极耳，所述第一极耳的一端连接在所述塑料薄膜的上表面的第一侧边缘，所述第一极耳的另一端突出于所述塑料薄膜，所述第一金属镀层覆盖于所述塑料薄膜的上表面，所述第一金属镀层靠近所述第一极耳的一端与所述第一极耳相接；In order to solve the above technical problems, on the one hand, the present application provides a current collector. The current collector includes a plastic film, a first metal coating, a second metal coating, a second tab and a first tab, one end of the first tab is connected to the first side edge of the upper surface of the plastic film, The other end of the first tab protrudes from the plastic film, the first metal plating layer covers the upper surface of the plastic film, and the first metal plating layer is close to one end of the first tab and the The first polar ears are connected;
所述第二极耳的一端连接于所述塑料薄膜的下表面的第二侧边缘，所述第二极耳的另一端突出于所述塑料薄膜，所述第二金属镀层覆盖于所述塑料薄膜的下表面，所述第二金属镀层靠近所述第二极耳的一端与所述第二极耳相接；One end of the second tab is connected to the second side edge of the lower surface of the plastic film, the other end of the second tab protrudes from the plastic film, and the second metal plating layer covers the plastic film. On the lower surface of the film, one end of the second metal plating layer close to the second tab is connected to the second tab;
所述第一金属镀层、第二金属镀层、第一极耳及第二极耳的材质相同。The materials of the first metal plating layer, the second metal plating layer, the first tab and the second tab are the same.
可选地，所述第一金属镀层及第二金属镀层为铝镀层，所述第一极耳及第二极耳为铝箔，所述集流体为正极集流体。Optionally, the first metal plating layer and the second metal plating layer are aluminum plating layers, the first tab and the second tab are aluminum foil, and the current collector is a positive electrode current collector.
可选地，所述第一金属镀层及第二金属镀层为铜镀层，所述第一极耳及第二极耳为铜箔，所述集流体为负极集流体。Optionally, the first metal plating layer and the second metal plating layer are copper plating layers, the first tab and the second tab are copper foil, and the current collector is a negative electrode current collector.
可选地，所述塑料薄膜的厚度为1-50微米；Optionally, the thickness of the plastic film is 1-50 microns;
所述第一金属镀层的厚度为0.5-1微米，所述第二金属镀层的厚度为0.5-1微米。The thickness of the first metal plating layer is 0.5-1 μm, and the thickness of the second metal plating layer is 0.5-1 μm.
可选地，所述第一金属镀层采用蒸镀的方式覆盖于所述塑料薄膜的上表面；所述第二金属镀层采用蒸镀的方式覆盖于所述塑料薄膜的下表面。Optionally, the first metal coating layer is covered on the upper surface of the plastic film by means of evaporation; the second metal coating layer is covered on the lower surface of the plastic film by means of evaporation.
可选地，所述第一极耳的一端通过辊压、静电或等离子体吸附连接在所述塑料薄膜的上表面的第一侧边缘；Optionally, one end of the first tab is connected to the first side edge of the upper surface of the plastic film by rolling, electrostatic or plasma adsorption;
所述第二极耳的一端通过辊压、静电或等离子体吸附连接在所述塑料薄膜的下表面的第二侧边缘。One end of the second tab is connected to the second side edge of the lower surface of the plastic film by rolling, electrostatic or plasma adsorption.
本申请实施例提供的集流体，包括塑料薄膜、第一金属镀层、第二金属镀层、第二极耳及第一极耳，所述第一极耳的一端连接在所述塑料薄膜的上表面的第一侧边缘，所述第一极耳的另一端突出于所述塑料薄膜，所述第一金属镀层覆盖于所述塑料薄膜的上表面，所述第一金属镀层靠近所述第一极耳的一端 与所述第一极耳相接，所述第二极耳的一端连接于所述塑料薄膜的下表面的第二侧边缘，所述第二极耳的另一端突出于所述塑料薄膜，所述第二金属镀层覆盖于所述塑料薄膜的下表面，所述第二金属镀层包覆所述塑料薄膜靠近所述第一极耳的一端，所述第二金属镀层靠近所述第二极耳的一端与所述第二极耳相接；本申请的集流体，极耳为金属，不会造成焊接不良；PET等树脂抗拉强度高，不易断带；金属镀层的蒸镀面积可控；蒸镀层与极耳引流部位接触良好；能量密度提升10％。The current collector provided by the embodiment of the present application includes a plastic film, a first metal coating, a second metal coating, a second tab and a first tab, and one end of the first tab is connected to the upper surface of the plastic film the first side edge, the other end of the first tab protrudes from the plastic film, the first metal coating covers the upper surface of the plastic film, and the first metal coating is close to the first pole One end of the lug is connected to the first lug, one end of the second lug is connected to the second side edge of the lower surface of the plastic film, and the other end of the second lug protrudes from the plastic film film, the second metal plating layer covers the lower surface of the plastic film, the second metal plating layer covers the end of the plastic film close to the first tab, and the second metal plating layer is close to the first tab One end of the diode lug is connected to the second lug; in the current collector of the present application, the lug is made of metal, which will not cause poor welding; PET and other resins have high tensile strength and are not easy to break; the evaporation area of the metal coating layer Controllable; the vapor deposition layer is in good contact with the drainage part of the tab; the energy density is increased by 10%.
另一方面，本申请实施例还提供了一种锂离子电池，其包括上述的集流体。On the other hand, an embodiment of the present application also provides a 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。FIG. 1 is a schematic diagram of a current collector provided by an embodiment of the present application.
说明书中的附图标记如下：The reference numbers in the description are as follows:
1、塑料薄膜；2、第一金属镀层；3、第二金属镀层；4、第一极耳；5、第二极耳。1. Plastic film; 2. The first metal coating; 3. The second metal coating; 4. The first tab; 5. The second tab.
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，包括塑料薄膜1、第一金属镀层2、第二金属镀层.、第二极耳5及第一极耳4，所述第一极耳4的一端连接在所述塑料薄膜1的上表面的第一侧边缘，所述第一极耳4的另一端突出于所述塑料薄膜1，所述第一金属镀层2覆盖于所述塑料薄膜1的上表面，所述第一金属镀层2靠近所述第一极耳4的一端与所述第一极耳4相接。As shown in FIG. 1 , the current collector provided in the embodiment of the present application includes a plastic film 1, a first metal coating 2, a second metal coating, a second tab 5 and a first tab 4. The first tab One end of 4 is connected to the first side edge of the upper surface of the plastic film 1, the other end of the first tab 4 protrudes from the plastic film 1, and the first metal coating 2 covers the plastic film. 1, the end of the first metal plating layer 2 close to the first tab 4 is in contact with the first tab 4.
所述第二极耳5的一端连接于所述塑料薄膜1的下表面的第二侧边缘，所述第二极耳5的另一端突出于所述塑料薄膜1，所述第二金属镀层3覆盖于所述 塑料薄膜1的下表面，所述第二金属镀层3靠近所述第二极耳5的一端与所述第二极耳5相接。One end of the second tab 5 is connected to the second side edge of the lower surface of the plastic film 1 , the other end of the second tab 5 protrudes from the plastic film 1 , and the second metal coating 3 Covered on the lower surface of the plastic film 1 , one end of the second metal plating layer 3 close to the second tab 5 is connected to the second tab 5 .
所述第一金属镀层2、第二金属镀层3、第一极耳4及第二极耳5的材质相同。The materials of the first metal plating layer 2 , the second metal plating layer 3 , the first tab 4 and the second tab 5 are the same.
可选地，塑料薄膜1的材质包括但不仅限于PET、OPP、PI、CPP、PVC等。Optionally, the material of the plastic film 1 includes, but is not limited to, PET, OPP, PI, CPP, PVC, and the like.
在一实施例中，所述第一金属镀层2及第二金属镀层3为铝镀层，所述第一极耳4及第二极耳5为铝箔，所述集流体为正极集流体。In one embodiment, the first metal plating layer 2 and the second metal plating layer 3 are aluminum plating layers, the first tab 4 and the second tab 5 are aluminum foil, and the current collector is a positive electrode current collector.
在一实施例中，所述第一金属镀层2及第二金属镀层3为铜镀层，所述第一极耳4及第二极耳5为铜箔，所述集流体为负极集流体。In one embodiment, the first metal plating layer 2 and the second metal plating layer 3 are copper plating layers, the first tab 4 and the second tab 5 are copper foil, and the current collector is a negative electrode current collector.
可选地，第一金属镀层2及第二金属镀层3可为同种金属，也可为不同种金属。Optionally, the first metal plating layer 2 and the second metal plating layer 3 may be of the same kind of metal, or may be of different kinds of metals.
在一实施例中，所述塑料薄膜1的厚度为1-50微米。In one embodiment, the thickness of the plastic film 1 is 1-50 microns.
所述第一金属镀层2的厚度为0.5-1微米，所述第二金属镀层3的厚度为0.5-1微米。The thickness of the first metal plating layer 2 is 0.5-1 μm, and the thickness of the second metal plating layer 3 is 0.5-1 μm.
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塑料薄膜1的上表面。In one embodiment, the first metal plating layer 2 is covered on the upper surface of the plastic film 1 by means of evaporation.
所述第二金属镀层3采用蒸镀的方式覆盖于所述塑料薄膜1的下表面。The second metal plating layer 3 is covered on the lower surface of the plastic film 1 by means of evaporation.
在一实施例中，所述第一极耳4的一端通过辊压、静电或等离子体吸附连接在所述塑料薄膜1的上表面的第一侧边缘。In one embodiment, one end of the first tab 4 is connected to the first side edge of the upper surface of the plastic film 1 by rolling, electrostatic or plasma adsorption.
所述第二极耳5的一端通过辊压、静电或等离子体吸附连接在所述塑料薄膜1的下表面的第二侧边缘。One end of the second tab 5 is connected to the second side edge of the lower surface of the plastic film 1 by rolling, electrostatic or plasma adsorption.
根据本申请实施例的集流体，所述第一极耳的一端连接在所述塑料薄膜的上表面的第一侧边缘，所述第一极耳的另一端突出于所述塑料薄膜，所述第一金属镀层覆盖于所述塑料薄膜的上表面，所述第一金属镀层靠近所述第一极耳的一端与所述第一极耳相接，所述第二极耳的一端连接于所述塑料薄膜的下表面的第二侧边缘，所述第二极耳的另一端突出于所述塑料薄膜，所述第二金属 镀层覆盖于所述塑料薄膜的下表面，所述第二金属镀层包覆所述塑料薄膜靠近所述第一极耳的一端，所述第二金属镀层靠近所述第二极耳的一端与所述第二极耳相接；本申请的集流体，极耳为金属，不会造成焊接不良；PET等树脂抗拉强度高，不易断带；金属镀层的蒸镀面积可控；蒸镀层与极耳引流部位接触良好；能量密度提升10％。According to the current collector of the embodiment of the present application, one end of the first tab is connected to the first side edge of the upper surface of the plastic film, the other end of the first tab protrudes from the plastic film, the A first metal plating layer covers the upper surface of the plastic film, one end of the first metal plating layer close to the first tab is connected to the first tab, and one end of the second tab is connected to the first tab. the second side edge of the lower surface of the plastic film, the other end of the second tab protrudes from the plastic film, the second metal plating layer covers the lower surface of the plastic film, the second metal plating layer The end of the plastic film that is close to the first tab is covered, and the end of the second metal plating layer that is close to the second tab is connected to the second tab; in the current collector of the present application, the tab is Metal, will not cause poor welding; PET and other resins have high tensile strength and are not easy to break; the evaporation area of the metal coating is controllable; the evaporation layer is in good contact with the tab drainage part; the energy density is increased by 10%.
另外，本申请一实施例还提供一种锂离子电池，其包括上述实施例的集流体。In addition, an embodiment of the present application further provides a lithium ion battery including 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 (7)

  1. 一种集流体，其中，包括塑料薄膜、第一金属镀层、第二金属镀层、第二极耳及第一极耳，所述第一极耳的一端连接在所述塑料薄膜的上表面的第一侧边缘，所述第一极耳的另一端突出于所述塑料薄膜，所述第一金属镀层覆盖于所述塑料薄膜的上表面，所述第一金属镀层靠近所述第一极耳的一端与所述第一极耳相接；A current collector, comprising a plastic film, a first metal coating, a second metal coating, a second tab and a first tab, one end of the first tab is connected to the first tab on the upper surface of the plastic film. One side edge, the other end of the first tab protrudes from the plastic film, the first metal plating layer covers the upper surface of the plastic film, and the first metal plating layer is close to the first tab one end is connected to the first tab;
    所述第二极耳的一端连接于所述塑料薄膜的下表面的第二侧边缘，所述第二极耳的另一端突出于所述塑料薄膜，所述第二金属镀层覆盖于所述塑料薄膜的下表面，所述第二金属镀层靠近所述第二极耳的一端与所述第二极耳相接；One end of the second tab is connected to the second side edge of the lower surface of the plastic film, the other end of the second tab protrudes from the plastic film, and the second metal plating layer covers the plastic film. On the lower surface of the film, one end of the second metal plating layer close to the second tab is connected to the second tab;
    所述第一金属镀层、第二金属镀层、第一极耳及第二极耳的材质相同。The materials of the first metal plating layer, the second metal plating layer, the first tab and the second tab are the same.
  2. 根据权利要求1所述的集流体，其中，所述第一金属镀层及第二金属镀层为铝镀层，所述第一极耳及第二极耳为铝箔，所述集流体为正极集流体。The current collector according to claim 1, wherein the first metal plating layer and the second metal plating layer are aluminum plating layers, the first tab and the second tab are aluminum foil, and the current collector is a positive electrode current collector.
  3. 根据权利要求1所述的集流体，其中，所述第一金属镀层及第二金属镀层为铜镀层，所述第一极耳及第二极耳为铜箔，所述集流体为负极集流体。The current collector according to claim 1, wherein the first metal plating layer and the second metal plating layer are copper plating layers, the first tab and the second tab are copper foil, and the current collector is a negative electrode current collector .
  4. 根据权利要求1-3任意一项所述的集流体，其中，所述塑料薄膜的厚度为1-50微米；The current collector according to any one of claims 1-3, wherein the thickness of the plastic film is 1-50 microns;
    所述第一金属镀层的厚度为0.5-1微米，所述第二金属镀层的厚度为0.5-1微米。The thickness of the first metal plating layer is 0.5-1 μm, and the thickness of the second metal plating layer is 0.5-1 μm.
  5. 根据权利要求1-3任意一项所述的集流体，其中，所述第一金属镀层采用蒸镀的方式覆盖于所述塑料薄膜的上表面；The current collector according to any one of claims 1-3, wherein the first metal plating layer is covered on the upper surface of the 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塑料薄膜的下表面。The second metal plating layer is covered on the lower surface of the plastic film by means of evaporation.
  6. 根据权利要求1-3任意一项所述的集流体，其中，所述第一极耳的一端通过辊压、静电或等离子体吸附连接在所述塑料薄膜的上表面的第一侧边缘；The current collector according to any one of claims 1-3, wherein one end of the first tab is connected to the first side edge of the upper surface of the plastic film by rolling, electrostatic or plasma adsorption;
    所述第二极耳的一端通过辊压、静电或等离子体吸附连接在所述塑料薄膜的下表面的第二侧边缘。One end of the second tab is connected to the second side edge of the lower surface of the plastic film by rolling, electrostatic or plasma adsorption.
  7. 一种锂离子电池，其中，包括权利要求1-6任意一项所述的集流体。A lithium ion battery, comprising the current collector of any one of claims 1-6.
PCT/CN2022/087856 2021-03-08 2022-04-20 Current collector and lithium-ion battery WO2022188894A1 (en)

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CN114204036A (en) * 2021-11-17 2022-03-18 合肥国轩高科动力能源有限公司 Preparation method of composite current collector

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