WO2022188893A1 - Battery cell - Google Patents
Battery cell Download PDFInfo
- Publication number
- WO2022188893A1 WO2022188893A1 PCT/CN2022/087855 CN2022087855W WO2022188893A1 WO 2022188893 A1 WO2022188893 A1 WO 2022188893A1 CN 2022087855 W CN2022087855 W CN 2022087855W WO 2022188893 A1 WO2022188893 A1 WO 2022188893A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plastic film
- positive
- metal coating
- negative
- negative electrode
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 96
- 239000002184 metal Substances 0.000 claims abstract description 96
- 239000002985 plastic film Substances 0.000 claims abstract description 71
- 229920006255 plastic film Polymers 0.000 claims abstract description 71
- 238000007747 plating Methods 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 22
- 239000007774 positive electrode material Substances 0.000 claims abstract description 19
- 239000007773 negative electrode material Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims description 64
- 238000000576 coating method Methods 0.000 claims description 64
- 239000010410 layer Substances 0.000 claims description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- 239000011889 copper foil Substances 0.000 claims description 4
- 229920002799 BoPET Polymers 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 7
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the negative metal coating 2 is covered on one side surface of the plastic film 5 and the first end of the plastic film 5 is covered, and the positive metal coating 8 is covered on the other side surface of the plastic film 5 And cover the second end of the plastic film 5, the negative electrode active material 4 is coated on the side surface of the negative electrode metal coating 2 away from the plastic film 5, and the positive electrode active material 7 is coated on the side surface of the negative electrode metal coating 2.
- the side surface of the positive metal coating 8 away from the plastic film 5; the negative metal coating 2, the plastic film 5 and the positive metal coating 8 are superimposed and wound into a bipolar current collector, the negative metal coating 2 and the positive electrode Metal plating 8 is insulating.
- the positive metal plating layer 8 is covered on the other side surface of the plastic film 5 by means of evaporation.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present application relates to the technical field of lithium ion batteries, and relates to a battery cell, comprising a winding core, a negative electrode tab and a positive electrode tab. The winding core is a multi-layer structure formed by winding a bipolar pole piece and a diaphragm stacked on the surface of one side of the bipolar pole piece. The bipolar pole piece comprises a plastic film, a negative electrode metal plating layer, a positive electrode metal plating layer, a negative electrode active material, and a positive electrode active material. The negative metal plating layer covers the surface of one side of the plastic film and covers a first end of the plastic film. The positive metal plating layer covers the surface of the other side of the plastic film and covers a second end of the plastic film. The negative electrode active material is coated on the surface of the side of the negative metal plating layer facing away from the plastic film. The positive electrode active material is coated on the surface of the side of the positive metal plating layer facing away from the plastic film. In the battery cell of the present application, the winding core is formed by winding only one bipolar plate and one layer of diaphragm, the process flow is simplified, the weight is light, and the energy density is high.
Description
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_
202110249640.6，发明名称为“
一种电芯”的中国专利申请的优先权，以及，于
_2021_年
_4_月
_25_日提交中国专利局、申请号为_
202110450143.2，发明名称为“
一种电芯”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 claims the priority of the following Chinese patent applications: filed with the Chinese Patent Office on _2021_year_3_month_8_ , application number _202110249640.6 , and the Chinese patent application entitled " A kind of battery cell ", and, on _2021_ The priority of the Chinese patent application filed on April 25 , 2021, with the application number of _ 202110450143.2 and the title of the invention is " a battery cell ", the entire contents of which are incorporated by reference in this application.
本申请属于锂离子电池技术领域，涉及一种电芯。The present application belongs to the technical field of lithium ion batteries, and relates to a battery cell.
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，可能造成电池短路。Although this method can reduce the thickness, it may cause a short circuit of the battery because the plastic film will adversely affect the welding during 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，可能造成电池短路的问题，提供一种电芯。The technical problem to be solved by the present application is to provide a battery cell in view of the problem that the existing plastic film will have a bad influence on the welding in the assembly process and may cause a short circuit of the battery.
为解决上述技术问题，本申请提供了一种电芯。该电芯包括卷芯、负极极耳及正极极耳，所述卷芯是由双极极片和叠加在所述双极极片的一侧表面上的隔膜卷绕而成的多层结构，所述双极极片包括塑料薄膜、负极金属镀层、正极金属镀层、负极活性物质及正极活性物质，所述负极金属镀层覆盖于所述塑料薄膜的一侧表面并包覆所述塑料薄膜的第一端，所述正极金属镀层覆盖于所述塑料薄膜的另一侧表面并包覆所述塑料薄膜的第二端，所述负极活性物质涂覆在所述负极金属镀层的背离所述塑料薄膜的一侧表面，所述正极活性物质涂覆在所述正极金属镀层的背离所述塑料薄膜的一侧表面；所述负极金属镀层、塑料薄膜及正极金属镀层叠加并卷绕为双极集流体，所述负极金属镀层与正极金属镀层绝缘；In order to solve the above technical problems, the present application provides a battery cell. The battery core includes a winding core, a negative electrode tab and a positive electrode tab, and the winding core is a multi-layer structure formed by winding a bipolar pole piece and a separator superimposed on one surface of the bipolar pole piece, The bipolar piece includes a plastic film, a negative metal coating, a positive metal coating, a negative active material and a positive active material, and the negative metal coating covers one side surface of the plastic film and covers the first part of the plastic film. At one end, the positive metal coating covers the other side surface of the plastic film and covers the second end of the plastic film, and the negative active material is coated on the negative electrode metal coating away from the plastic film. The side surface of the positive electrode active material is coated on the side surface of the positive electrode metal coating away from the plastic film; the negative electrode metal coating, the plastic film and the positive metal coating are superimposed and wound into a bipolar current collector , the negative electrode metal coating is insulated from the positive electrode metal coating;
所述负极极耳连接在所述负极金属镀层的第一端，所述正极极耳连接在所述正极金属镀层的第一端。The negative electrode tab is connected to the first end of the negative metal plating layer, and the positive electrode tab is connected to the first end of the positive electrode metal plating layer.
可选地，所述塑料薄膜的一侧表面设置有第一阶梯面，所述负极金属镀层覆盖所述第一阶梯面；Optionally, one side surface of the plastic film is provided with a first stepped surface, and the negative metal plating layer covers the first stepped surface;
所述塑料薄膜的另一侧表面设置有第二阶梯面，所述正极金属镀层覆盖所述第二阶梯面。The other side surface of the plastic film is provided with a second stepped surface, and the positive metal plating layer covers the second stepped surface.
可选地，所述负极金属镀层为铜镀层，所述正极金属镀层为铝镀层；所述负极极耳为铜箔片，所述正极极耳为铝箔片。Optionally, the negative electrode metal coating is a copper coating, and the positive electrode metal coating is an aluminum coating; the negative electrode tab is a copper foil, and the positive electrode tab is an aluminum foil.
可选地，所述塑料薄膜为PET薄膜。Optionally, the plastic film is a PET film.
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;
所述负极金属镀层的厚度为0.5-1微米，所述正极金属镀层的厚度为0.5-1微米。The thickness of the negative electrode metal plating layer is 0.5-1 micrometer, and the thickness of the positive electrode metal plating layer is 0.5-1 micrometer.
可选地，所述负极金属镀层采用蒸镀的方式覆盖于所述塑料薄膜的一侧表面；Optionally, the negative electrode metal coating is covered on one side surface of the plastic film by means of evaporation;
所述正极金属镀层采用蒸镀的方式覆盖于所述塑料薄膜的另一侧表面。The positive metal plating layer is covered on the other side surface of the plastic film by means of evaporation.
可选地，所述隔膜贴附在所述正极活性物质上。Optionally, the separator is attached to the positive active material.
可选地，所述隔膜贴附在所述正负极活性物质上。Optionally, the separator is attached to the positive and negative active materials.
本申请实施例提供的电芯，包括卷芯、负极极耳及正极极耳，所述卷芯是由双极极片和叠加在所述双极极片的一侧表面上的隔膜卷绕而成的多层结构，所述双极极片包括塑料薄膜、负极金属镀层、正极金属镀层、负极活性物质及正极活性物质，所述负极金属镀层覆盖于所述塑料薄膜的一侧表面并包覆所述塑料薄膜的第一端，所述正极金属镀层覆盖于所述塑料薄膜的另一侧表面并包覆所述塑料薄膜的第一端，所述负极活性物质涂覆在所述负极金属镀层的背离所述塑料薄膜的一侧表面，所述正极活性物质涂覆在所述正极金属镀层的背离所述塑料薄膜的一侧表面；所述负极金属镀层、塑料薄膜及正极金属镀层叠加并卷绕为双极集流体，所述负极金属镀层与正极金属镀层绝缘；所述负极极耳连接在所述负极金属镀层的第一端，所述正极极耳连接在所述正极金属镀层的第一端，所述负极极耳及正极极耳位于所述卷芯的外部。本申请的电芯，卷芯仅需一种双极极片及一层隔膜进行卷绕而成，简化工艺流程，重量轻；能量密度高。The battery core provided by the embodiment of the present application includes a winding core, a negative electrode tab, and a positive electrode tab. The winding core is formed by winding a bipolar pole piece and a separator superimposed on one surface of the bipolar pole piece. The bipolar plate includes a plastic film, a negative electrode metal coating, a positive electrode metal coating, a negative electrode active material and a positive electrode active material, and the negative electrode metal coating covers one side surface of the plastic film and wraps The first end of the plastic film, the positive metal coating covers the other side surface of the plastic film and covers the first end of the plastic film, and the negative active material is coated on the negative metal coating The surface of the side facing away from the plastic film, the positive active material is coated on the surface of the positive metal coating on the side facing away from the plastic film; the negative metal coating, the plastic film and the positive metal coating are superimposed and rolled It is wound as a bipolar current collector, and the negative metal coating is insulated from the positive metal coating; the negative electrode tab is connected to the first end of the negative metal coating, and the positive electrode tab is connected to the first end of the positive metal coating. The negative electrode tab and the positive electrode tab are located outside the winding core. In the battery core of the present application, the winding core only needs one bipolar pole piece and a layer of separator to be wound, which simplifies the technological process, is light in weight, and has high energy density.
图1是本申请一实施例提供的电芯的双极极片示意图；FIG. 1 is a schematic diagram of a bipolar pole piece of a cell provided by an embodiment of the present application;
图2是本申请第一实施例提供的电芯的双极极片及隔膜示意图；2 is a schematic diagram of a bipolar pole piece and a diaphragm of a battery cell provided by the first embodiment of the present application;
图3是本申请第二实施例提供的电芯的双极极片及隔膜示意图；3 is a schematic diagram of a bipolar pole piece and a diaphragm of a battery cell provided by the second embodiment of the present application;
图4是本申请一实施例提供的电芯示意图。FIG. 4 is a schematic diagram of a battery cell 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:
10、双极极片；1、负极极耳；2、负极金属镀层；3、隔膜；4、负极活性物质；5、塑料薄膜；6、正极极耳；7、正极活性物质；8、正极金属镀层。10. Bipolar pole piece; 1. Negative electrode tab; 2. Negative electrode metal coating; 3. Diaphragm; 4. Negative electrode active material; 5. Plastic film; 6. Positive electrode tab; 7. Positive electrode active material; 8. Positive electrode metal coating.
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至图2所示，本申请实施例提供的电芯，包括卷芯、负极极耳1及正极极耳6，所述卷芯是由双极极片10和叠加在所述双极极片10的一侧表面上的隔膜3卷绕而成的多层结构，所述双极极片10包括塑料薄膜5、负极金属镀层2、正极金属镀层8、负极活性物质4及正极活性物质7，所述负极金属镀层2覆盖于所述塑料薄膜5的一侧表面并包覆所述塑料薄膜5的第一端，所述正极金属镀层8覆盖于所述塑料薄膜5的另一侧表面并包覆所述塑料薄膜5的第二端，所述负极活性物质4涂覆在所述负极金属镀层2的背离所述塑料薄膜5的一侧表面，所述正极活性物质7涂覆在所述正极金属镀层8的背离所述塑料薄膜5的一侧表面；所述负极金属镀层2、塑料薄膜5及正极金属镀层8叠加并卷绕为双极集流体，所述负极金属镀层2与正极金属镀层8绝缘。As shown in FIG. 1 to FIG. 2 , the battery core provided by the embodiment of the present application includes a winding core, a negative electrode tab 1 and a positive electrode tab 6 , and the winding core is composed of a bipolar pole piece 10 and a superimposed on the bipolar electrode. A multilayer structure in which the separator 3 on one side surface of the pole piece 10 is wound, and the bipolar pole piece 10 includes a plastic film 5, a negative electrode metal coating 2, a positive metal coating 8, a negative electrode active material 4 and a positive electrode active material. 7. The negative metal coating 2 is covered on one side surface of the plastic film 5 and the first end of the plastic film 5 is covered, and the positive metal coating 8 is covered on the other side surface of the plastic film 5 And cover the second end of the plastic film 5, the negative electrode active material 4 is coated on the side surface of the negative electrode metal coating 2 away from the plastic film 5, and the positive electrode active material 7 is coated on the side surface of the negative electrode metal coating 2. The side surface of the positive metal coating 8 away from the plastic film 5; the negative metal coating 2, the plastic film 5 and the positive metal coating 8 are superimposed and wound into a bipolar current collector, the negative metal coating 2 and the positive electrode Metal plating 8 is insulating.
所述负极极耳1连接在所述负极金属镀层2的第一端，所述正极极耳6连接在所述正极金属镀层8的第一端。The negative electrode tab 1 is connected to the first end of the negative electrode metal plating layer 2 , and the positive electrode tab 6 is connected to the first end of the positive electrode metal plating layer 8 .
在一实施例中，所述塑料薄膜5的一侧表面设置有第一阶梯面(图中未示出)，所述负极金属镀层2覆盖所述第一阶梯面。In one embodiment, a first stepped surface (not shown in the figure) is provided on one surface of the plastic film 5 , and the negative metal plating layer 2 covers the first stepped surface.
所述塑料薄膜5的另一侧表面设置有第二阶梯面(图中未示出)，所述正极金属镀层8覆盖所述第二阶梯面。The other side surface of the plastic film 5 is provided with a second stepped surface (not shown in the figure), and the positive metal plating layer 8 covers the second stepped surface.
在一实施例中，所述负极金属镀层2为铜镀层，所述正极金属镀层8为铝镀层。In one embodiment, the negative electrode metal coating layer 2 is a copper coating layer, and the positive electrode metal coating layer 8 is an aluminum coating layer.
所述负极极耳1为铜箔片，所述正极极耳6为铝箔片。The negative electrode tab 1 is a copper foil, and the positive electrode tab 6 is an aluminum foil.
可选地，所述负极极耳1不限于铜，也可为其他金属或合金元素。所述正极极耳6不限于铝，也可为其他金属或合金元素。Optionally, the negative electrode tab 1 is not limited to copper, but can also be other metals or alloy elements. The positive electrode tab 6 is not limited to aluminum, and can also be other metals or alloy elements.
在一实施例中，所述塑料薄膜5为PET薄膜。In one embodiment, the plastic film 5 is a PET film.
可选地，塑料薄膜5的材质包括但不仅限于PET、OPP、PI、CPP、PVC等。Optionally, the material of the plastic film 5 includes, but is not limited to, PET, OPP, PI, CPP, PVC, and the like.
在一实施例中，所述塑料薄膜5的厚度为1-50微米。In one embodiment, the thickness of the plastic film 5 is 1-50 microns.
所述负极金属镀层2的厚度为0.5-1微米，所述正极金属镀层8的厚度为0.5-1微米。The thickness of the negative metal plating layer 2 is 0.5-1 micrometer, and the thickness of the positive metal plating layer 8 is 0.5-1 micrometer.
在一实施例中，所述负极金属镀层2采用蒸镀的方式覆盖于所述塑料薄膜5的一侧表面。In one embodiment, the negative electrode metal plating layer 2 is covered on one side surface of the plastic film 5 by means of evaporation.
所述正极金属镀层8采用蒸镀的方式覆盖于所述塑料薄膜5的另一侧表面。The positive metal plating layer 8 is covered on the other side surface of the plastic film 5 by means of evaporation.
在一实施例中，所述隔膜3贴附在所述正极活性物质7上。In one embodiment, the separator 3 is attached to the positive electrode active material 7 .
在一实施例中，所述隔膜3贴附在所述正负极活性物质4上。In one embodiment, the separator 3 is attached to the positive and negative electrode active material 4 .
可选地，进行卷绕时，塑料薄膜5可位于卷芯的外侧或包裹于卷芯内。Optionally, during winding, the plastic film 5 may be located on the outside of the core or wrapped in the core.
根据本申请实施例的电芯，所述卷芯是由双极极片和叠加在所述双极极片的一侧表面上的隔膜卷绕而成的多层结构，所述双极极片包括塑料薄膜、负极金属镀层、正极金属镀层、负极活性物质及正极活性物质，所述负极金属镀层覆盖于所述塑料薄膜的一侧表面并包覆所述塑料薄膜的第一端，所述正极金属镀层覆盖于所述塑料薄膜的另一侧表面并包覆所述塑料薄膜的第一端，所述负极活性物质涂覆在所述负极金属镀层的背离所述塑料薄膜的一侧表面，所述正极活性物质涂覆在所述正极金属镀层的背离所述塑料薄膜的一侧表面；所述负极金属镀层、塑料薄膜及正极金属镀层叠加并卷绕为双极集流体，所述负极金属镀层与正极金属镀层绝缘；所述负极极耳连接在所述负极金属镀层的第一端，所述正极极耳连接在所述正极金属镀层的第一端，所述负极极耳及正极极耳位于所述卷芯的外部。本申请的电芯，卷芯仅需一种双极极片及一层隔膜进行卷绕而成，简化工艺流程，重量轻；能量密度高。According to the battery core of the embodiment of the present application, the winding core is a multi-layer structure formed by winding a bipolar pole piece and a separator superimposed on one side surface of the bipolar pole piece, and the bipolar pole piece Including plastic film, negative metal coating, positive metal coating, negative active material and positive active material, the negative metal coating covers one side surface of the plastic film and covers the first end of the plastic film, the positive electrode The metal plating layer covers the other side surface of the plastic film and covers the first end of the plastic film, and the negative electrode active material is coated on the side surface of the negative electrode metal plating layer that is away from the plastic film. The positive electrode active material is coated on the side surface of the positive electrode metal coating away from the plastic film; the negative electrode metal coating, the plastic film and the positive metal coating are superimposed and wound into a bipolar current collector, and the negative electrode metal coating It is insulated from the positive metal coating; the negative electrode tab is connected to the first end of the negative metal coating, the positive electrode tab is connected to the first end of the positive metal coating, and the negative electrode tab and the positive electrode tab are located at the outside of the core. In the battery core of the present application, the winding core only needs one bipolar pole piece and a layer of separator to be wound, which simplifies the technological process, is light in weight, and has high energy density.
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 (8)
- 一种电芯，其中，包括卷芯、负极极耳及正极极耳，所述卷芯是由双极极片和叠加在所述双极极片的一侧表面上的隔膜卷绕而成的多层结构，所述双极极片包括塑料薄膜、负极金属镀层、正极金属镀层、负极活性物质及正极活性物质，所述负极金属镀层覆盖于所述塑料薄膜的一侧表面并包覆所述塑料薄膜的第一端，所述正极金属镀层覆盖于所述塑料薄膜的另一侧表面并包覆所述塑料薄膜的第二端，所述负极活性物质涂覆在所述负极金属镀层的背离所述塑料薄膜的一侧表面，所述正极活性物质涂覆在所述正极金属镀层的背离所述塑料薄膜的一侧表面；所述负极金属镀层、塑料薄膜及正极金属镀层叠加并卷绕为双极集流体，所述负极金属镀层与正极金属镀层绝缘；A battery core, which includes a winding core, a negative electrode tab and a positive electrode tab, the winding core is formed by winding a bipolar pole piece and a separator superimposed on one side surface of the bipolar pole piece Multi-layer structure, the bipolar pole piece includes a plastic film, a negative metal coating, a positive metal coating, a negative active material and a positive active material, and the negative metal coating covers one side surface of the plastic film and covers the The first end of the plastic film, the positive metal coating covers the other side surface of the plastic film and covers the second end of the plastic film, and the negative active material is coated on the opposite side of the negative metal coating. One side surface of the plastic film, the positive active material is coated on the side surface of the positive metal coating away from the plastic film; the negative metal coating, the plastic film and the positive metal coating are superimposed and wound as Bipolar current collector, the negative electrode metal coating is insulated from the positive electrode metal coating;所述负极极耳连接在所述负极金属镀层的第一端，所述正极极耳连接在所述正极金属镀层的第一端。The negative electrode tab is connected to the first end of the negative metal plating layer, and the positive electrode tab is connected to the first end of the positive electrode metal plating layer.
- 根据权利要求1所述的电芯，其中，所述塑料薄膜的一侧表面设置有第一阶梯面，所述负极金属镀层覆盖所述第一阶梯面；The battery core according to claim 1, wherein a first stepped surface is provided on one side surface of the plastic film, and the negative metal coating layer covers the first stepped surface;所述塑料薄膜的另一侧表面设置有第二阶梯面，所述正极金属镀层覆盖所述第二阶梯面。The other side surface of the plastic film is provided with a second stepped surface, and the positive metal plating layer covers the second stepped surface.
- 根据权利要求1所述的电芯，其中，所述负极金属镀层为铜镀层，所述正极金属镀层为铝镀层；The cell according to claim 1, wherein the negative electrode metal coating is copper coating, and the positive electrode metal coating is aluminum coating;所述负极极耳为铜箔片，所述正极极耳为铝箔片。The negative electrode tabs are copper foils, and the positive electrode tabs are aluminum foils.
- 根据权利要求1所述的电芯，其中，所述塑料薄膜为PET薄膜。The battery according to claim 1, wherein the plastic film is a PET film.
- 根据权利要求1-4任意一项所述的电芯，其中，所述塑料薄膜的厚度为1-50微米；The battery according to any one of claims 1-4, wherein the plastic film has a thickness of 1-50 microns;所述负极金属镀层的厚度为0.5-1微米，所述正极金属镀层的厚度为0.5-1微米。The thickness of the negative electrode metal plating layer is 0.5-1 micrometer, and the thickness of the positive electrode metal plating layer is 0.5-1 micrometer.
- 根据权利要求1-4任意一项所述的电芯，其中，所述负极金属镀层采用 蒸镀的方式覆盖于所述塑料薄膜的一侧表面；The battery cell according to any one of claims 1-4, wherein the negative electrode metal coating is covered on one side surface of the plastic film by means of evaporation;所述正极金属镀层采用蒸镀的方式覆盖于所述塑料薄膜的另一侧表面。The positive metal plating layer is covered on the other side surface of the plastic film by means of evaporation.
- 根据权利要求1所述的电芯，其中，所述隔膜贴附在所述正极活性物质上。The battery cell according to claim 1, wherein the separator is attached to the positive electrode active material.
- 根据权利要求1所述的电芯，其中，所述隔膜贴附在所述正负极活性物质上。The battery cell according to claim 1, wherein the separator is attached to the positive and negative electrode active materials.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249640.6 | 2021-03-08 | ||
| CN202110249640 | 2021-03-08 | ||
| CN202110450143.2A CN113161628A (en) | 2021-03-08 | 2021-04-25 | Battery cell |
| CN202110450143.2 | 2021-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022188893A1 true WO2022188893A1 (en) | 2022-09-15 |
Family
ID=76870560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2022/087855 WO2022188893A1 (en) | 2021-03-08 | 2022-04-20 | Battery cell |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113161628A (en) |
| WO (1) | WO2022188893A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161628A (en) * | 2021-03-08 | 2021-07-23 | 深圳市璞厉科技有限公司 | Battery cell |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004273304A (en) * | 2003-03-10 | 2004-09-30 | Matsushita Electric Ind Co Ltd | Electrode and battery using the same |
| CN110247057A (en) * | 2018-03-30 | 2019-09-17 | 宁德时代新能源科技股份有限公司 | Current collector, pole piece thereof and electrochemical device |
| CN110660999A (en) * | 2018-09-30 | 2020-01-07 | 宁德时代新能源科技股份有限公司 | Current collector, pole piece and electrochemical device |
| CN211088397U (en) * | 2020-01-03 | 2020-07-24 | 深圳市海鸿新能源技术有限公司 | Secondary battery and pole piece thereof |
| CN212659570U (en) * | 2020-07-28 | 2021-03-05 | 深圳市海鸿新能源技术有限公司 | Bipolar current collector, pole piece and battery cell |
| CN212659571U (en) * | 2020-07-28 | 2021-03-05 | 深圳市海鸿新能源技术有限公司 | Bipolar current collector, pole piece and secondary battery |
| CN112968180A (en) * | 2021-03-08 | 2021-06-15 | 深圳市璞厉科技有限公司 | Pole piece and lithium ion battery |
| CN112968207A (en) * | 2021-03-08 | 2021-06-15 | 深圳市璞厉科技有限公司 | Composite battery |
| CN113161628A (en) * | 2021-03-08 | 2021-07-23 | 深圳市璞厉科技有限公司 | Battery cell |
-
2021
- 2021-04-25 CN CN202110450143.2A patent/CN113161628A/en active Pending
-
2022
- 2022-04-20 WO PCT/CN2022/087855 patent/WO2022188893A1/en unknown
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004273304A (en) * | 2003-03-10 | 2004-09-30 | Matsushita Electric Ind Co Ltd | Electrode and battery using the same |
| CN110247057A (en) * | 2018-03-30 | 2019-09-17 | 宁德时代新能源科技股份有限公司 | Current collector, pole piece thereof and electrochemical device |
| CN110660999A (en) * | 2018-09-30 | 2020-01-07 | 宁德时代新能源科技股份有限公司 | Current collector, pole piece and electrochemical device |
| CN211088397U (en) * | 2020-01-03 | 2020-07-24 | 深圳市海鸿新能源技术有限公司 | Secondary battery and pole piece thereof |
| CN212659570U (en) * | 2020-07-28 | 2021-03-05 | 深圳市海鸿新能源技术有限公司 | Bipolar current collector, pole piece and battery cell |
| CN212659571U (en) * | 2020-07-28 | 2021-03-05 | 深圳市海鸿新能源技术有限公司 | Bipolar current collector, pole piece and secondary battery |
| CN112968180A (en) * | 2021-03-08 | 2021-06-15 | 深圳市璞厉科技有限公司 | Pole piece and lithium ion battery |
| CN112968207A (en) * | 2021-03-08 | 2021-06-15 | 深圳市璞厉科技有限公司 | Composite battery |
| CN113161628A (en) * | 2021-03-08 | 2021-07-23 | 深圳市璞厉科技有限公司 | Battery cell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113161628A (en) | 2021-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211088397U (en) | Secondary battery and pole piece thereof | |
| WO2020168879A1 (en) | Pole piece, cell and battery | |
| US11127982B2 (en) | Electrode assembly and battery with sectioned active layers | |
| CN112928281B (en) | Ear-free cylindrical battery and preparation method thereof | |
| CN112968207A (en) | Composite battery | |
| WO2021232720A1 (en) | Multi-tab cylindrical battery roll core and lithium ion battery | |
| WO2022188894A1 (en) | Current collector and lithium-ion battery | |
| JP2009530778A (en) | Soft package large capacity lithium ion battery and method of manufacturing the same | |
| EP3944396A1 (en) | Secondary battery, electrode member thereof, battery module and related apparatus | |
| KR20120031606A (en) | Electrode lead whose protection layer for anti-corrosion is selectively formed, and secondary battery comprising thereof | |
| WO2023093298A1 (en) | Positive electrode plate and battery | |
| WO2022188893A1 (en) | Battery cell | |
| CN112864350A (en) | Battery core and battery | |
| CN206878126U (en) | Secondary cell | |
| US11127955B2 (en) | Electrode assembly and battery | |
| CN208336372U (en) | Electrode plates, electrode assembly and secondary cell | |
| CN114613942A (en) | Silicon-containing negative electrode plate and lithium ion battery containing same | |
| CN114335407A (en) | Pole piece and battery | |
| CN112968180A (en) | Pole piece and lithium ion battery | |
| CN219497877U (en) | Multipolar ear cell and multipolar ear battery | |
| CN212542528U (en) | Battery roll core and battery | |
| CN212676341U (en) | Lithium ion battery | |
| WO2021136551A1 (en) | Rechargeable battery, electrode sheet thereof, and preparation method for electrode sheet | |
| CN215220801U (en) | Battery cell | |
| CN208690371U (en) | A kind of safety lithium ion cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22766415 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 32PN | Ep: public notification in the ep bulletin as address of the adressee cannot be established |
Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 25/01/2024) |