WO2022183374A1 - 一种柔性电池及其制造方法 - Google Patents
一种柔性电池及其制造方法 Download PDFInfo
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- WO2022183374A1 WO2022183374A1 PCT/CN2021/078706 CN2021078706W WO2022183374A1 WO 2022183374 A1 WO2022183374 A1 WO 2022183374A1 CN 2021078706 W CN2021078706 W CN 2021078706W WO 2022183374 A1 WO2022183374 A1 WO 2022183374A1
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- anode
- cathode
- sheets
- electrical connector
- empty foil
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/136—Flexibility or foldability
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present application relates to the field of battery technology, and in particular, to a flexible battery and a manufacturing method thereof.
- the current flexible battery is cut from the overall coated pole piece to achieve the mobility of the spine, but the coated pole piece will form burrs when cutting, which brings safety hazards.
- the cutting and removal process will result in a decrease in the utilization rate of the pole piece and an increase in the cost.
- the embodiments of the present application provide a flexible battery and a manufacturing method thereof, which can reduce production safety risks and increase the utilization rate of pole pieces.
- a flexible battery including a plurality of cathode sheets, a cathode electrical connector, a plurality of anode sheets, an anode electrical connector, and a plurality of separators.
- the cathode electrical connector is welded to the plurality of cathode sheets
- the anode electrical connector is welded to the plurality of anode sheets.
- Each of the anode sheets corresponds to one of the cathode sheets
- each of the separators is provided between a corresponding one of the anode sheets and a corresponding one of the cathode sheets.
- the plurality of cathode sheets, the plurality of anode sheets, and the plurality of separators are wound around the cathode electrical connector and the anode electrical connector to form a plurality of cell units and connect two adjacent electrical connectors.
- the cell unit is bent, and/or the spine portion is bent.
- the spine portion is any one of a wave shape, a sinusoidal arc shape, a U shape, and a sawtooth shape.
- a distance is set between two adjacent cell units.
- the cathode sheet includes a first empty foil area, a second empty foil area and a first coating area, and the first coating area is located in the first empty foil area and the second empty foil area In between, the cathode electrical connectors are respectively welded with the first empty foil regions of the plurality of cathode sheets.
- the anode sheet includes a third empty foil area, a fourth empty foil area and a second coating area, the second coating area is located between the third empty foil area and the fourth empty foil area, the anode The electrical connectors are respectively welded with the third empty foil regions of the plurality of anode sheets.
- the flexible battery further includes a packaging film, and the battery cell unit is accommodated in the packaging film.
- the surface of the cathode electrical connector is provided with a first insulating tape, and the surface of the anode electrical connector is provided with a second insulating tape.
- a method for manufacturing a flexible battery comprising: arranging a plurality of cathode sheets at intervals in sequence, welding a cathode electrical connector to the plurality of cathode sheets to form a first connection structure, and connecting a plurality of anode sheets The plates are arranged at intervals in sequence, and the anode electrical connectors are welded to the plurality of anode plates to form a second connection structure, and the first connection structure, the first diaphragm, the second connection structure, and the second diaphragm are stacked in sequence.
- the method further includes: bending the cell unit.
- the method further comprises: bending the spine region.
- the step of bending the spine part further includes: bending the spine part into any one of a wave shape, a sine arc shape, a U shape, and a zigzag shape.
- the method further includes: encapsulating the cell unit in a packaging film.
- the step of welding the cathode electrical connector and the plurality of cathode sheets to form a first connection structure further includes: respectively connecting the cathode electrical connector to the first connection structure of the plurality of cathode sheets The empty foil area is welded to form the first connection structure.
- the step of welding the anode electrical connectors to the plurality of anode sheets respectively to form the second connection structure further includes: welding the anode electrical connectors to the third empty foil regions of the plurality of anode sheets to form the second connection structure, respectively. the second connection structure.
- laser welding or ultrasonic welding is used between the plurality of cathode sheets and the cathode electrical connectors.
- Laser welding or ultrasonic welding is adopted between the plurality of anode sheets and the anode electrical connection member.
- a laser cutting or die cutting process is used to cut off the portions of the first separator and the second separator located adjacent to two anode sheets.
- the method further includes: affixing a first insulating tape to both sides of the cathode electrical connector, and affixing a second insulating tape to both sides of the anode electrical connector.
- a plurality of cathode sheets are welded to the cathode electrical connection member, and a plurality of anode sheets are welded to the anode electrical connection member.
- the plurality of separators are wound to form a plurality of cell units, the part of the cathode electrical connector and the anode electrical connector located between two adjacent cell units forms a spine part, and the cathode sheet and
- the anode sheet has been formed into the required strip structure, and does not need to be cut during winding, so that the generation of burrs and particles can be avoided, the safety risk of production can be reduced, and the utilization rate of the electrode sheet can be increased at the same time.
- FIG. 1 is a schematic structural diagram of a flexible battery according to an embodiment of the present application.
- FIG. 2 is an exploded schematic view of the flexible battery shown in FIG. 1;
- FIG. 3 is a schematic structural diagram of the first connection structure, the second connection structure, the first diaphragm and the second diaphragm before the flexible battery shown in FIG. 1 is wound;
- FIG. 4 is a schematic structural diagram of the first connection structure, the second connection structure, the first diaphragm and the second diaphragm shown in FIG. 3 after winding;
- FIG. 5 is a schematic structural diagram of the flexible battery shown in FIG. 1 from another perspective;
- any side of the cathode sheet 10 is divided into a first empty foil area 11 , a second empty foil area 12 and a first coating area 13 according to preset positions, and the first empty foil area 11 and the second empty foil area 12 are respectively provided in the cathode At both ends of the sheet 10 along its length direction, the first coating area 13 is provided between the first empty foil area 11 and the second empty foil area 12 .
- the plurality of cathode sheets 10 are arranged at intervals in sequence, and the cathode electrical connectors 30 are respectively welded with the first empty foil regions 11 of the plurality of cathode sheets 10 to form a first connection structure A1 .
- the cathode electrical connector 30 and the plurality of cathode sheets 10 may be connected by means of laser welding or ultrasonic welding.
- the anode sheet 20 is similar in structure to the cathode sheet 10, the anode sheet 20 is a strip-shaped sheet structure, the anode sheet 20 includes a current collector and an anode material coated on the current collector, wherein the current collector of the anode sheet 20 can be copper foil , the anode material can be graphite, silicon, etc. Any side of the anode sheet 20 is divided into a third empty foil area 21 , a fourth empty foil area 22 and a second coating area 23 according to preset positions, and the third empty foil area 21 and the fourth empty foil area 22 are respectively arranged on the anode. At both ends of the sheet 20 along its length direction, the second coating area 23 is provided between the third empty foil area 21 and the fourth empty foil area 22 .
- the cathode electrical connecting member 30 is made of metal material, and the cathode electrical connecting member 30 is a strip structure or a wire structure.
- the cathode electrical connecting member 30 can be an aluminum metal strip, a copper wire, or the like.
- the cathode electrical connector 30 extends along the direction in which the plurality of cathode sheets 10 are arranged, one end of the cathode electrical connector 30 extends to protrude from the plurality of cathode sheets 10, and one end of the cathode electrical connector 30 extends out of the plurality of cathode sheets 10 as a flexible battery
- the positive tab of 100 is provided with tab glue (not shown in the figure) at the connection between the positive tab and the cathode sheet 10 .
- the first connection structure A1, the first diaphragm A3, the second connection structure A2, and the second diaphragm A4 are stacked in sequence to form a stacked structure;
- the cathode sheet 10 and the anode sheet 20 have been formed into the required strip structure before coating, and no cutting is required during winding, which can avoid the generation of burrs and particles, reduce the safety risk of production, and at the same time can increase the polarity slice utilization.
- the first diaphragm A3 and the second diaphragm A4 are whole diaphragms, which are arranged between the plurality of cathode sheets 10 and the plurality of anode sheets 20, so that the plurality of cathode sheets 10 and the plurality of anode sheets 20 can be integrally wound and formed. Increase productivity.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
本申请涉及电池技术领域,提供一种柔性电池及其制造方法,柔性电池包括多个阴极片、阴极电连接件、多个阳极片、阳极电连接件以及多个隔膜。所述阴极电连接件与所述多个阴极片焊接,阳极电连接件与所述多个阳极片焊接,所述多个阴极片、所述多个阳极片、所述多个隔膜卷绕于所述阴极电连接件和所述阳极电连接件,所述多个阴极片、所述多个阳极片、所述多个隔膜形成多个电芯单元,所述阴极电连接件和所述阳极电连接件位于相邻的两个电芯单元之间的部分形成脊柱部位,所述阴极片和所述阳极片已形成所需的条状结构,卷绕时无需切割,可以避免毛刺和颗粒的产生,降低生产的安全风险,同时可以增加极片的利用率。
Description
本申请涉及电池技术领域,特别涉及一种柔性电池及其制造方法。
随着移动设备、可穿戴设备的快速发展,这些设备对其所使用的电池的柔性提出了更高的要求。目前的柔性电池是通过整体涂布后的极片裁切而成,从而实现脊柱的活动性,但涂布后的极片裁切时会形成毛刺,带来安全隐患,同时由于采用极片裁切去除处理,会造成极片利用率下降,成本增加。
【发明内容】
为了解决上述技术问题,本申请实施例提供一种柔性电池及其制造方法,可以降低生产安全风险,增加极片利用率。
本申请实施例解决其技术问题采用以下技术方案:
第一方面,提供一种柔性电池,包括多个阴极片、阴极电连接件、多个阳极片、阳极电连接件以及多个隔膜。所述阴极电连接件与所述多个阴极片焊接,所述阳极电连接件与所述多个阳极片焊接。每个所述阳极片与一个所述阴极片相对应,每个所述隔膜设于对应的一个所述阳极片与对应的一个阴极片之间。所述多个阴极片、所述多个阳极片、所述多个隔膜卷绕于所述阴极电连接件和所述阳极电连接件,形成多个电芯单元及连接两相邻所述电芯单元的脊柱部位。
在一些实施例中,所述电芯单元为弯折状,和/或,所述脊柱部位为弯折状。
在一些实施例中,所述脊柱部位为波浪状、正弦弧形状、U型状、锯齿状中任意一种形状。
在一些实施例中,两个相邻的电芯单元之间设有间距。
在一些实施例中,所述阴极片包括第一空箔区、第二空箔区和第一涂布 区,所述第一涂布区位于所述第一空箔区和第二空箔区之间,所述阴极电连接件分别与所述多个阴极片的第一空箔区焊接。所述阳极片包括第三空箔区、第四空箔区和第二涂布区,所述第二涂布区位于所述第三空箔区和第四空箔区之间,所述阳极电连接件分别与所述多个阳极片的第三空箔区焊接。
在一些实施例中,所述柔性电池还包括包装膜,所述电芯单元收容于所述包装膜内。
在一些实施例中,所述阴极电连接件的表面设有第一绝缘胶带,所述阳极电连接件的表面设有第二绝缘胶带。
第二方面,提供一种柔性电池的制造方法,所述方法包括:将多个阴极片依次间隔排列,将阴极电连接件与所述多个阴极片焊接形成第一连接结构,将多个阳极片依次间隔排列,将阳极电连接件分别与所述多个阳极片焊接形成第二连接结构,将所述第一连接结构、第一隔膜、所述第二连接结构、第二隔膜依次叠放,形成叠置结构,将所述叠置结构卷绕,将所述第一隔膜和第二隔膜位于相邻的两个阳极片之间的部分以及相邻的两个阴极片之间的部分切断,形成多个电芯单元及连接两相邻电芯单元的脊柱部位。
在一些实施例中,所述方法还包括:对所述电芯单元进行弯折处理。
在一些实施例中,所述方法还包括:对所述脊柱部位进行弯折处理。
在一些实施例中,所述对脊柱部位进行弯折处理的步骤,进一步包括:将所述脊柱部位弯折成波浪状、正弦弧形状、U型状、锯齿状中任意一种形状。
在一些实施例中,所述方法还包括:将所述电芯单元封装于包装膜中。
在一些实施例中,所述将阴极电连接件与所述多个阴极片焊接形成第一连接结构的步骤,进一步包括:将所述阴极电连接件分别与所述多个阴极片的第一空箔区焊接形成所述第一连接结构。所述将阳极电连接件分别与所述多个阳极片焊接形成第二连接结构的步骤,进一步包括:将所述阳极电连接件分别与所述多个阳极片的第三空箔区焊接形成所述第二连接结构。
在一些实施例中,所述多个阴极片和所述阴极电连接件之间采用激光焊接或超声波焊接。所述多个阳极片和所述阳极电连接件之间采用激光焊接或超声波焊接。
在一些实施例中,使用激光切割或刀模切割工艺,将所述第一隔膜和第二隔 膜位于相邻的两个阳极片的部分切断。
在一些实施例中,所述方法还包括:对所述阴极电连接件的两面粘贴第一绝缘胶带,对所述阳极电连接件的的两面粘贴第二绝缘胶带。
与现有技术相比较,在本申请的实施例中,多个阴极片焊接于阴极电连接件,多个阳极片焊接于阳极电连接件,所述多个阴极片、所述多个阳极片、所述多个隔膜卷绕形成多个电芯单元,所述阴极电连接件和所述阳极电连接件位于相邻的两个电芯单元之间的部分形成脊柱部位,所述阴极片和所述阳极片已形成所需的条状结构,卷绕时无需切割,可以避免毛刺和颗粒的产生,降低生产的安全风险,同时可以增加极片的利用率。
一个或多个实施例通过与之对应的附图进行示例性说明,这些示例性说明并不构成对实施例的限定,附图中具有相同参考数字标号的元件表示为类似的元件,除非有特别申明,附图中的图不构成比例限制。
图1为本申请其中一实施例提供的一种柔性电池的结构示意图;
图2为图1所示的柔性电池的分解示意图;
图3为图1所示的柔性电池卷绕前的第一连接结构、第二连接结构、第一隔膜以及第二隔膜的结构示意图;
图4为图3所示的第一连接结构、第二连接结构、第一隔膜以及第二隔膜卷绕后的结构示意图;
图5为图1所示的柔性电池的另一视角的结构示意图;
图6为本申请另一实施例提供的一种柔性电池的结构示意图;
图7为本申请另一实施例提供的一种柔性电池的结构示意图。
为了便于理解本申请,下面结合附图和具体实施例,对本申请进行更详细的说明。需要说明的是,当元件被表述“固定于”另一个元件,它可以直接在另一个元件上、或者其间可以存在一个或多个居中的元件。当一个元件被表述“连接”另一个元件,它可以是直接连接到另一个元件、或者其间可 以存在一个或多个居中的元件。本说明书所使用的术语“垂直的”、“水平的”、“左”、“右”、“内”、“外”以及类似的表述只是为了说明的目的。
除非另有定义,本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的,不是用于限制本申请。本说明书所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
此外,下面所描述的本申请不同实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
请一并参阅图1和图2,本申请其中一实施例提供一种柔性电池100,包括阴极片10、阳极片20、阴极电连接件30、阳极电连接件40以及隔膜50。阴极片10、阳极片20以及隔膜50的数量分别为多个,每个阴极片10与一个阳极片20相对应,每个隔膜50设于对应的一个阴极片10与对应的一个阳极片20之间。多个阴极片10与阴极电连接件30焊接,多个阳极片20与阳极电连接件40焊接,多个阴极片10、多个阳极片20以及多个隔膜50卷绕于阴极电连接件30和阳极电连接件40,形成多个电芯单元101及连接两相邻电芯单元101的脊柱部位102。
请一并参阅图3,阴极片10为条状片体结构,阴极片10包括集流体和和涂布于集流体上的阴极材料,其中,阴极片10的集流体可为铝箔,阴极材料可为钴酸锂、磷酸铁锂或三元材料等。阴极片10的任意一面按预设位置划分为第一空箔区11、第二空箔区12以及第一涂布区13,第一空箔区11和第二空箔区12分别设于阴极片10沿其长度方向的两端,第一涂布区13设于第一空箔区11和第二空箔区12之间。多个阴极片10依次间隔排列,阴极电连接件30分别与多个阴极片10的第一空箔区11焊接后形成第一连接结构A1。其中,阴极电连接件30与多个阴极片10之间可采用激光焊接或者超声波焊接等方式连接。
阳极片20与阴极片10的结构相似,阳极片20为条状片体结构,阳极片20包括集流体和涂布于集流体上的阳极材料,其中,阳极片20的集流体可以为铜箔,阳极材料可为石墨、硅等。阳极片20的任意一面按预设位置划分为第三空箔区21、第四空箔区22以及第二涂布区23,第三空箔区21和第四空箔区22分别设于阳极片20沿其长度方向的两端,第二涂布区23设于第三空 箔区21和第四空箔区22之间。多个阳极片20依次间隔排列,阳极电连接件40分别与多个阳极片20的第三空箔区21焊接后形成第二连接结构A2。其中,阳极电连接件40与多个阳极片20之间可采用激光焊接或者超声波焊接等方式连接。
阴极电连接件30由金属材料制成,阴极电连接件30为带状结构或导线结构,比如,阴极电连接件30可以为铝金属带、铜导线等。阴极电连接件30沿多个阴极片10排列的方向延伸,阴极电连接件30的一端延伸至突出于多个阴极片10,阴极电连接件30延伸出多个阴极片10的一端作为柔性电池100的正极耳,正极耳与阴极片10连接的连接处设有极耳胶(图未示)。
阳极电连接件40由金属材料制成,阳极电连接件40可以为带状结构或导线结构,比如,阳极电连接件40可以为镍金属带、铝导线等。阳极电连接件40沿多个阳极片20排列的方向延伸,阳极电连接件40的一端延伸至突出于多个阳极片20,阳极电连接件40延伸出多个阳极片20的一端作为柔性电池100的负极耳,负极耳与阳极片20连接处设有极耳胶(图未示)。
在一些实施例中,阴极电连接件30和多个阴极片10焊接后,对阴极电连接件30的两面粘贴第一绝缘胶带(图未示),以形成第一连接结构A1,阳极电连接件40与多个阳极片20焊接后,对阳极电连接件40的两面粘贴第二绝缘胶带(图未示),以形成第二连接结构A2,可避免卷绕时阴极电连接件30和阳极电连接件40刺穿阴极片10、阳极片20以及隔膜50,同时也可以对脊柱部位102进行绝缘。
隔膜50为绝缘材料制成的条状片体结构,隔膜50通过隔膜整片切割形成。隔膜整片卷绕于阴极电连接件30和阳极电连接件40上,再切断或切断一部分形成多个隔膜50。在本实施例中,隔膜整片的数量为两个,分别为第一隔膜A3和第二隔膜A4。
请一并参阅图4和图5,柔性电池100制造时,先通过卷绕机将第一连接结构A1、整片的第一隔膜A3、第二连接结构A2、整片的第二隔膜A4卷绕成一体结构,再将第一隔膜A3和第二隔膜A4多余的部分采用激光切割工艺或刀模等机构切断。
具体地,将第一连接结构A1、第一隔膜A3、第二连接结构A2、第二隔膜A4依次叠放于卷绕机的导向槽中,每个阴极片10的位置与一个阳极片20 的位置相对应,阴极电连接件30和阳极电连接件40的位置相对应,保证入卷前和卷绕过程中阴极片10和阳极片20的平行度;第一空箔区11和第三空箔区21作为卷绕的头部,通过卷绕机将第一连接结构A1、整片的第一隔膜A3、第二连接结构A2、整片的第二隔膜A4入卷形成一体结构(如图4所示);将第一隔膜A3和第二隔膜A4位于相邻的阴极片10之间以及相邻的两个阳极片20之间的部分切断,第一隔膜A3和第二隔膜A4分别形成多个隔膜50,以使得阴极电连接件30和阳极电连接件40部分裸露(如图5所示)。其中,一阴极片10、一阳极片20、第一隔膜A3切割形成的一隔膜50、第二隔膜A4切割形成的一隔膜50卷绕后的部分形成一电芯单元101,阴极电连接件30和阳极电连接件40位于相邻的两个电芯单元101之间的部分形成脊柱部位102。
两个相邻的电芯单元101之间设有间距,以保证第一隔膜A3和第二隔膜A4在切断时形成的隔膜50不向电芯单元101内收缩。该间距的大小根据电池厚度和电池弯折角度需求设置,电池弯折角度一般不大于90度,该间距的大小一般不小于电池厚度。其中,电池厚度为电芯单元101的厚度,电池弯折角度为相邻两个电芯单元101之间的夹角。
请一并参阅图6和图7,在一些实施例,电芯单元101设置为弯折状,可以提高电池关节柔性,降低阴极电连接件30和阳极电连接件40对电芯单元101的拉应力。其中,电芯单元101可以通过模压工艺进行弯折处理,使电芯单元101与脊柱部位102连接的两端分别相对其中心部分弯折形成弧状,以得到所需要的弯折弧度。
在一些实施例中,脊柱部位102设置为弯折状,脊柱部位102可以为波浪状、正弦弧形状、U型状、锯齿状或其他异形结构形状。其中,脊柱部位102通过模压工艺进行弯折处理,再对多个电芯单元101进行整体弯折处理,以减少电芯单元101整体模压时处于拉伸状态下的应力。
在一些实施例中,柔性电池100还包括包装膜103,电芯单元101收容于包装膜103内。包装膜103可以仅包覆电芯单元101,或者包装膜103也可以将整体包覆电芯单元101和脊柱部位102,又或者,包装膜103分别包覆电芯单元101和脊柱部位102,在此不予限定。
包装膜103可以采用包装材料进行一体化封装成型,比如,将包装材料 热封于电芯单元101的外部形成包装膜103;或者,包装膜103可以采用包装材料进行模具冲坑成型,比如,将包装材料按照电芯单元101和脊柱部位102整体的形状冲坑成型后,将电芯单元101和脊柱部位102整体入壳封装。其中,包装材料可以为铝塑膜。
下面结合上述附图对柔性电池100的制造方法进行说明:
多个阴极片10依次间隔排列,将阴极电连接件30分别与多个阴极片10焊接形成第一连接结构A1;
多个阳极片20依次间隔排列,阳极电连接件40分别与多个阳极片20焊接形成第二连接结构A2;
将第一连接结构A1、第一隔膜A3、第二连接结构A2、第二隔膜A4依次叠放,形成叠置结构;
以阴极电连接件30和阳极电连接件40为轴,将叠置结构卷绕;
将第一隔膜A3和多第一隔膜A4以及相邻的两个阴极片之间的部分切断,形成多个电芯单元101及连接两相邻电芯单元的脊柱部位102;
对脊柱部位102进行弯折处理;
对电芯单元101进行弯折处理;
将电芯单元101封装于包装膜103中。
具体地,阴极电连接件30分别与多个阴极片10的第一空箔区11通过激光焊接或超声波焊接,再对阴极电连接件30的两面贴附第一绝缘胶带,以形成第一连接结构A1;阳极电连接件40分别与多个阳极片20的第三空箔区21通过激光焊接或超声波焊接,再对阳极电连接件40的两面贴附第二绝缘胶带以形成第二连接结构A2;第一连接结构A1、第一隔膜A3、第二连接结构A2、第二隔膜A4依次叠放后,通过卷绕机卷绕形成一体结构;第一隔膜A3和多第一隔膜A4以及相邻的两个阴极片之间的部分采用激光切割工艺或者刀模等结构切断;电芯单元101通过模压工艺成波浪状、正弦弧形状、U型状、锯齿状等任意形状;电芯单元101通过模压工艺将弯折成弧状,以得到所需要的弯折弧度;采用包装材料热封成型或者模具冲坑成型,并封装于电芯单元101的外部。
在本实施例中,阴极片10和阳极片20在涂布前已形成所需的条状结构,卷绕时无需切割,可以避免毛刺和颗粒的产生,降低生产的安全风险,同时 可以增加极片的利用率。其次,第一隔膜A3和第二隔膜A4为整片隔膜,设置于多个阴极片10和多个阳极片20之间,可以使得多个阴极片10和多个阳极片20一体卷绕成型,提高生产效率。再次,阴极电连接件30突出于阴极片10的一端可作为正极耳,阳极电连接件40突出于阳极片20的一端可作为负极耳,不需要再另外焊接极耳,使得加工工艺更加简单。
最后应说明的是:以上实施例仅用以说明本申请的技术方案,而非对其限制;在本申请的思路下,以上实施例或者不同实施例中的技术特征之间也可以进行组合,步骤可以以任意顺序实现,并存在如上的本申请的不同方面的许多其它变化,为了简明,它们没有在细节中提供;尽管参照前述实施例对本申请进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。
Claims (16)
- 一种柔性电池,其特征在于,包括:多个阴极片;阴极电连接件,与所述多个阴极片焊接;多个阳极片,每个所述阳极片与一个所述阴极片相对应;阳极电连接件,与所述多个阳极片焊接;多个隔膜,每个所述隔膜设于对应的一个所述阳极片与对应的一个阴极片之间;所述多个阴极片、所述多个阳极片、所述多个隔膜卷绕于所述阴极电连接件和所述阳极电连接件,形成多个电芯单元及连接两相邻所述电芯单元的脊柱部位。
- 根据权利要求1所述的柔性电池,其特征在于,所述电芯单元为弯折状,和/或,所述脊柱部位为弯折状。
- 根据权利要求2所述的柔性电池,其特征在于,所述脊柱部位为波浪状、正弦弧形状、U型状、锯齿状中任意一种形状。
- 根据权利要求1所述的柔性电池,其特征在于,两个相邻的电芯单元之间设有间距。
- 根据权利要求1所述的柔性电池,其特征在于,所述阴极片包括第一空箔区、第二空箔区和第一涂布区,所述第一涂布区位于所述第一空箔区和第二空箔区之间;所述阴极电连接件分别与所述多个阴极片的第一空箔区焊接;所述阳极片包括第三空箔区、第四空箔区和第二涂布区,所述第二涂布区位于所述第三空箔区和第四空箔区之间;所述阳极电连接件分别与所述多个阳极片的第三空箔区焊接。
- 根据权利要求1-5任一项所述的柔性电池,其特征在于,所述柔性电池还包括包装膜,所述电芯单元收容于所述包装膜内。
- 根据权利要求1-5任一项所述的柔性电池,其特征在于,所述阴极电连接件的表面设有第一绝缘胶带,所述阳极电连接件的表面设有第二绝缘胶带。
- 一种柔性电池的制造方法,其特征在于,所述方法包括:将多个阴极片依次间隔排列;将阴极电连接件与所述多个阴极片焊接形成第一连接结构;将多个阳极片依次间隔排列;将阳极电连接件与所述多个阳极片焊接形成第二连接结构;将所述第一连接结构、第一隔膜、所述第二连接结构、第二隔膜依次叠放,形成叠置结构;以所述阴极电连接件及阳极电连接件为轴,将所述叠置结构卷绕;将所述第一隔膜和第二隔膜位于相邻的两个阳极片之间的部分以及相邻的两个阴极片之间的部分切断,形成多个电芯单元及连接两相邻电芯单元的脊柱部位。
- 根据权利要求8所述的柔性电池的制造方法,其特征在于,所述方法还包括:对所述电芯单元进行弯折处理。
- 根据权利要求8-9任一项所述的柔性电池的制造方法,其特征在于,所述方法包括:对所述脊柱部位进行弯折处理。
- 根据权利要求10所述的柔性电池的制造方法,其特征在于,所述对脊柱部位进行弯折处理的步骤,进一步包括:将所述脊柱部位弯折成波浪状、正弦弧形状、U型状、锯齿状中任意一种 形状。
- 根据权利要求8所述的柔性电池的制造方法,其特征在于,所述方法还包括:将所述电芯单元封装于包装膜中。
- 根据权利要求8所述的柔性电池的制造方法,其特征在于,所述阴极片包括第一空箔区、第二空箔区和第一涂布区,所述第一涂布区位于所述第一空箔区和第二空箔区之间;所述将阴极电连接件与所述多个阴极片焊接形成第一连接结构的步骤,进一步包括:将所述阴极电连接件分别与所述多个阴极片的第一空箔区焊接形成所述第一连接结构;所述阳极片包括第三空箔区、第四空箔区和第二涂布区,所述第二涂布区位于所述第三空箔区和第四空箔区之间;所述将阳极电连接件分别与所述多个阳极片焊接形成第二连接结构的步骤,进一步包括:将所述阳极电连接件分别与所述多个阳极片的第三空箔区焊接形成所述第二连接结构。
- 根据权利要求8或13任一项所述的柔性电池的制造方法,其特征在于,所述多个阴极片和所述阴极电连接件之间采用激光焊接或超声波焊接;所述多个阳极片和所述阳极电连接件之间采用激光焊接或超声波焊接。
- 根据权利要求8所述的柔性电池的制造方法,其特征在于,所述将所述第一隔膜和第二隔膜位于相邻的两个阳极片的部分切断的步骤,进一步包括:使用激光切割或刀模切割工艺,将所述第一隔膜和第二隔膜位于相邻的两个阳极片的部分切断。
- 根据权利要求8所述的柔性电池的制造方法,其特征在于,所述方法还包括:对所述阴极电连接件的两面粘贴第一绝缘胶带;对所述阳极电连接件的的两面粘贴第二绝缘胶带。
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| CN114256500A (zh) * | 2021-12-01 | 2022-03-29 | 中国电子科技南湖研究院 | 一种可裁切的带状柔性固态电池 |
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| JP2018055902A (ja) * | 2016-09-28 | 2018-04-05 | 株式会社 東北テクノアーチ | 二次電池 |
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| Publication number | Publication date |
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| CN114667636A (zh) | 2022-06-24 |
| EP4300642A4 (en) | 2025-01-01 |
| CN114667636B (zh) | 2024-06-14 |
| EP4300642A1 (en) | 2024-01-03 |
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