WO2022205141A1 - 一种电极组件、电化学装置及用电设备 - Google Patents

一种电极组件、电化学装置及用电设备 Download PDF

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Publication number
WO2022205141A1
WO2022205141A1 PCT/CN2021/084600 CN2021084600W WO2022205141A1 WO 2022205141 A1 WO2022205141 A1 WO 2022205141A1 CN 2021084600 W CN2021084600 W CN 2021084600W WO 2022205141 A1 WO2022205141 A1 WO 2022205141A1
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Prior art keywords
bending part
bending
electrode assembly
conductive sheet
pole piece
Prior art date
Application number
PCT/CN2021/084600
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English (en)
French (fr)
Inventor
彭涛
杨新
Original Assignee
宁德新能源科技有限公司
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Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202180005607.7A priority Critical patent/CN114467223A/zh
Priority to PCT/CN2021/084600 priority patent/WO2022205141A1/zh
Publication of WO2022205141A1 publication Critical patent/WO2022205141A1/zh

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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
    • H01M50/531—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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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 technical field of energy storage, and in particular, to an electrode assembly, an electrochemical device and an electrical device.
  • Lithium-ion batteries have many advantages, such as large volume and mass energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and are widely used in the field of consumer electronics.
  • the electrode assembly in the lithium-ion battery has tabs connected to the current collector. Usually, the tabs are assembled or transferred by a transfer welding process or a conductive adhesive bonding process to form the tabs that finally extend out of the packaging case.
  • the welding structure or bonding structure of the tab In order to save the head space of the electrode assembly after packaging and improve the volume energy density of the electrode assembly, the welding structure or bonding structure of the tab must be bent to form a bent structure to minimize the volume.
  • the existing electrode assemblies have relatively large stress at the bends, especially the electrode assemblies of the multi-tab structure, which cause the bending structure to be prone to rebound, which affects the reliability and safety of the electrochemical device.
  • the embodiments of the present application provide an electrode assembly, an electrochemical device, and an electrical device, which can solve the problem that the bent structure of the tab is prone to rebound.
  • an embodiment of the present application provides an electrode assembly, including: a pole piece assembly, a first conductive sheet and a second conductive sheet;
  • the first conductive sheet includes: a first non-bending part connected to the pole piece assembly, a first bending part connected to the first non-bending part, and a first bending part connected to the first non-bending part A connected second non-bending part, wherein the second non-bending part includes a first region connected to the second conductive sheet.
  • the second conductive sheet includes: a third non-bending part connected to the second non-bending part, a second bending part connected to the third non-bending part, and , a fourth non-bending part connected to the second bending part.
  • the first bent portion and the second bent portion are located on the same side of the first region.
  • the bending angle of the first bending portion is ⁇ , and 80° ⁇ 100°.
  • the length of the second non-bending portion is less than the thickness of the pole piece assembly.
  • the surface of the first bent portion is provided with an insulating member.
  • an insulating member is disposed between the second non-bending portion and the pole piece assembly.
  • the bending angle of the second bending portion is ⁇ , and 80° ⁇ 100°.
  • the third non-bending portion includes a second region connected to the first region, and an insulating member is provided on a surface of the second region.
  • the surface of the fourth non-bending portion is provided with tab glue.
  • the first conductive sheet is integrally formed.
  • the second conductive sheet is integrally formed.
  • the pole piece assembly includes at least one of a wound structure or a laminated structure.
  • the electrode assembly includes a plurality of the first conductive sheets, and the plurality of the first conductive sheets are connected by a plurality of the second non-bending parts.
  • an embodiment of the present application provides an electrochemical device, comprising: the electrode assembly as described in the first aspect above.
  • the electrochemical device further comprises:
  • the packaging case includes a receiving groove, the pole piece assembly, the first non-bending part, the first bending part, the second non-bending part, the the third non-bending part and the second bending part are accommodated in the accommodating groove;
  • the second conductive sheet further includes a protruding portion located outside the packaging shell, and the protruding portion is connected to the fourth non-bending portion.
  • an embodiment of the present application provides an electrical device, including: the electrochemical device as described in the above second aspect.
  • the beneficial effects of the present application are: different from the prior art, the electrode assembly provided by the present application has only one bending of the first conductive sheet, and there is no rebound caused by the original multiple bending. Therefore, the first conductive sheet is not easy to rebound, which effectively reduces the difficulty of packaging the electrode assembly into the case, and greatly improves the reliability and safety of the electrochemical device.
  • FIG. 1 is a schematic side view structure diagram of an electrode assembly provided by an embodiment of the present application
  • FIG. 2 is a schematic side view of the structure of another electrode assembly provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of an electrochemical device provided in an embodiment of the present application.
  • FIG. 4 is another schematic structural diagram of an electrochemical device provided in an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an electrical device provided by an embodiment of the present application.
  • the embodiment of the present application provides an electrode assembly, which is replaced by one-time tab bending
  • the traditional multi-bending electrode structure can effectively eliminate the rebound force/stress of two or more times of bending, thereby reducing the peeling and exposure of the tape wrapped outside the electrode assembly on the one hand, and on the other hand. It can reduce the difficulty of entering the electrode assembly into the shell and release the head space of the packaging shell, thereby improving the volumetric energy density of the electrochemical device, and reducing the problem of reverse insertion of the electrode ears caused by too small head space, greatly improving the electrochemical device. reliability and safety.
  • a first aspect of an embodiment of the present application provides an electrode assembly. Please refer to FIG. 1 , which shows a side view structure of an electrode assembly provided by an embodiment of the present application.
  • the electrode assembly 100 includes: a pole piece assembly 110 , The first conductive sheet 120 and the second conductive sheet 130 .
  • the first conductive sheet 120 includes: a first non-bending part 121 connected to the pole piece assembly 110, a first bending part 122 connected to the first non-bending part 121, and a first non-bending part 122 connected to the first non-bending part 121.
  • the second non-bending part 123 connected to the first bending part 122 , wherein the second non-bending part 123 includes a first region 1230 connected to the second conductive sheet 130 .
  • the electrode assembly provided by the embodiment of the present application only needs to bend the first conductive sheet 120 once, and the rebound force caused by bending is small, which is beneficial to the installation of the electrode assembly 100, and at the same time, it is beneficial to reduce the head space and improve the electric power.
  • the volume energy density of the chemical device can be reduced, and problems such as the reverse insertion of the tabs caused by too small head space can be reduced, and the reliability and safety of the electrochemical device can be greatly improved.
  • connection between the first region 1230 and the second conductive sheet 130 may be formed by welding, riveting, conductive material bonding, etc., and the welding methods include laser welding, resistance welding, ultrasonic welding, etc.
  • the electrical connection between the first conductive sheet 120 and the second conductive sheet 130 is realized.
  • the first area 1230 shown in FIG. 1 is the welded area in the second non-bending portion 123 .
  • the connection mode can be selected according to actual needs, and does not need to be bound by the limitations of the embodiments of the present application.
  • the second conductive sheet 130 includes: a third non-bending part 131 connected to the second non-bending part 123 ; a second bending part 131 connected to the third non-bending part 131 The bent portion 132 and the fourth non-bent portion 133 connected with the second bent portion 132 .
  • the first bent portion 122 and the second bent portion 132 are located on the same side of the first region 1230 .
  • the bending angle of the first bending portion 122 is ⁇ , and 80° ⁇ 100°.
  • the bending angle ⁇ is determined by extending the first non-bending portion 121 and the second non-bending portion 123 to intersect, respectively, and the included angle between them is 180°- ⁇ .
  • the length of the second non-bending portion 123 is less than the thickness H of the pole piece assembly 110;
  • the bending angle ⁇ of the bending portion 122 is set to be close to 90°, so as to better balance the increase in volume energy density and the risk of short circuit caused by the interference between the second non-bending portion 123 and the pole piece assembly 110 .
  • an insulating member 150 is disposed on the surface of the first bending portion 122 .
  • an insulating member 150 is disposed between the second non-bending portion 123 and the pole piece assembly 110 .
  • the risk of short circuit caused by interference between the second non-bending portion 123 and the pole piece assembly 110 can be further reduced.
  • the bending angle of the second bending portion 132 is ⁇ , and 80° ⁇ 100°; wherein, the bending angle ⁇ is determined by: 131 and the fourth non-bending portion 133 respectively extend to intersect, and the included angle between the two is 180°- ⁇ .
  • the third non-bending portion 131 includes a second region 1310 connected to the first region 1230, and the surface of the second region 1310 is provided with an insulating member 150; Disposing the insulating member 150 on the surface can reduce the damage to the packaging case caused by the sharp part (for example, the solder print) at the connection between the first conductive sheet and the second conductive sheet, and improve the service life of the electrochemical device.
  • the sharp part for example, the solder print
  • insulating member 150 includes insulating tape.
  • tab glue 160 is disposed on the surface of the fourth non-bending portion 133 .
  • the first conductive sheet 120 is integrally formed.
  • the second conductive sheet 130 is integrally formed.
  • the pole piece assembly 110 includes at least one of a wound structure or a laminated structure.
  • the electrode assembly 100 includes a plurality of the first conductive sheets 120 , and the plurality of the first conductive sheets 120 are connected by a plurality of the second non-bending portions 123 .
  • the pole piece assembly 110 includes a positive pole piece, a negative pole piece and a separator, and the separator is located between the positive pole piece and the negative pole piece.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector.
  • the positive electrode active material layer may be located on one side or both sides of the positive electrode current collector.
  • the positive electrode current collector can be aluminum foil, of course, other positive electrode current collectors commonly used in the art can also be used.
  • the positive active material may include at least one of lithium cobalt oxide, lithium manganate, lithium iron phosphate, lithium iron manganese phosphate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, or lithium nickel manganate, The above-mentioned positive electrode active material may be subjected to doping and/or coating treatment.
  • the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector.
  • the anode active material layer may be provided on one side or both sides of the anode current collector.
  • the negative electrode current collector may use at least one of copper foil, nickel foil or carbon-based current collector.
  • the anode active material layer may include an anode active material.
  • the negative active material includes at least one of a carbon material or a silicon-based material.
  • the carbon material includes at least one of graphite, hard carbon, and soft carbon; and the silicon-based material includes at least one of silicon, silicon oxide, silicon carbon, or silicon alloy.
  • the first conductive sheet 120 connected to the positive electrode or the negative electrode in the pole piece assembly 110 is connected along the pole piece
  • the thickness H direction of the component 110 is bent at an angle ⁇ from the tab area to the non-tab area; then, the head of the first conductive sheet 120 is cut by a die (the second non-bending portion 123 in FIG. 1 is flat to keep the head of the first conductive sheet 120 flush; then, the bottom of the second conductive sheet 130 (the lower end of the third non-bent portion 131 in FIG. 1 ) that has been bent at an angle of ⁇ (the lower end of the third non-bent portion 131 in FIG.
  • the heads of the first conductive sheets 120 are aligned, welded or riveted together to form the first area 1230 and the second area 1310; 122), between the second non-bending portion 123 and the pole piece assembly 110 and at the connection (that is, the surface of the second area 1310), an insulating member 150 (green glue) is provided, so as to make the required non-rebound,
  • the electrode assembly 100 can be easily put into the case.
  • a second aspect of the embodiments of the present application provides an electrochemical device. Please refer to FIG. 2 , which shows the structure of the electrochemical device provided by the embodiments of the present application.
  • the electrochemical device 200 includes: A described electrode assembly 100 .
  • the electrochemical device 200 is a device capable of converting chemical energy into electrical energy, and specific examples thereof include all kinds of primary batteries, secondary batteries, fuel cells, solar cells, or capacitors.
  • the electrochemical device is a lithium secondary battery, including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery. .
  • FIG. 3 shows a structure of an electrochemical device 200 provided in an embodiment of the present application, and the electrochemical device 200 further includes:
  • the packaging case 210 includes a receiving groove (not shown in the figure, provided inside the packaging case 210 ), the pole piece assembly 110 , the first non-bending portion 121 , the first non-bending portion 121 , the A bending portion 122, the second non-bending portion 123, the third non-bending portion 131, and the second bending portion 132 are accommodated in the receiving groove (not shown);
  • the second conductive sheet 130 further includes a protruding portion 134 located outside the packaging shell 110 , and the protruding portion 134 is connected to the fourth non-bending portion 133 .
  • the electrochemical device 200 adopts the electrode assembly 100 described in the above-mentioned first embodiment, which can effectively reduce the difficulty of loading the electrode assembly 100 into the receiving groove of the packaging case 210, and can release all the
  • the head space of the packaging case 210 can be improved to improve the energy density of the electrochemical device 200 and avoid problems such as reverse insertion of the tabs due to too small head space, which can effectively improve the reliability and safety of the electrochemical device 200 .
  • FIG. 4 shows a structure of an electrical device 300 provided by an embodiment of the present application.
  • the electrical device 300 includes the above-mentioned embodiments. 2.
  • the powered devices of the present application include, but are not limited to, notebook computers, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, head-mounted stereos Headphones, VCRs, LCD TVs, Portable Cleaners, Portable CD Players, Mini CDs, Transceivers, Electronic Notepads, Calculators, Memory Cards, Portable Recorders, Radios, Backup Power, Motors, Automobiles, motorcycles, Power-assisted Bicycles, Bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.
  • the embodiments of the present application provide an electrode assembly, which can be applied to an electrochemical device of an electrical device.
  • the electrode assembly includes a pole piece assembly, a first conductive sheet, and a second conductive sheet.
  • the first conductive sheet includes: The first non-bending part connected with the pole piece assembly, the first bending part connected with the first non-bending part, and the second non-bending part connected with the first bending part, wherein , the second non-bending portion includes a first area connected to the second conductive sheet, the electrode assembly provided by the embodiment of the present application has only one bending of the first conductive sheet, and there is no multiple bending to bring about Therefore, the first conductive sheet is not easy to rebound, which effectively reduces the difficulty of packaging the electrode assembly into the case, and greatly improves the reliability and safety of the electrochemical device.

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Abstract

本申请公开了一种电极组件，能够应用在用电设备的电化学装置中，该电极组件包括极片组件、第一导电片和第二导电片，第一导电片包括：与所述极片组件连接的第一非弯折部，与所述第一非弯折部连接的第一弯折部，以及，与所述第一弯折部连接的第二非弯折部，其中，所述第二非弯折部包括与所述第二导电片连接的第一区域。本申请提供的电极组件由于第一导电片仅存在一次弯折，不存在多次弯折带来的反弹力，因此第一导电片不容易反弹，有效减少了电极组件包装入壳的难度，大大提升了电化学装置的使用可靠性和安全性。

Description

一种电极组件、电化学装置及用电设备 技术领域
本申请涉及储能技术领域，特别涉及一种电极组件、电化学装置及用电设备。
背景技术
锂离子电池具有体积和质量能量密度大、循环寿命长、标称电压高、自放电率低、体积小、重量轻等许多优点，在消费电子领域具有广泛的应用。锂离子电池中的电极组件，具有连接集流体的极耳，通常采用转接焊的工艺或使用导电胶粘结工艺将极耳汇整或转接后形成最终伸出包装壳的极耳。为了节约包装后电极组件的头部空间，提高电极组件的体积能量密度，须将极耳的焊接结构或粘结结构进行弯折，组成弯折结构，最大化的减少体积。然而，现有的电极组件在弯折处存在较大的应力，特别是多极耳结构的电极组件，导致弯折结构易出现反弹，影响电化学装置的使用可靠性和安全性。
发明内容
本申请实施例提供了一种电极组件、电化学装置及用电设备，能够解决极耳弯折结构容易出现反弹的问题。
为解决上述技术问题，第一方面，本申请实施例中提供了一种电极组件，包括：极片组件、第一导电片和第二导电片；
所述第一导电片包括：与所述极片组件连接的第一非弯折部，与所 述第一非弯折部连接的第一弯折部，以及，与所述第一弯折部连接的第二非弯折部，其中，所述第二非弯折部包括与所述第二导电片连接的第一区域。
在一些实施例中，所述第二导电片包括：与所述第二非弯折部连接的第三非弯折部，与所述第三非弯折部连接的第二弯折部，以及，与所述第二弯折部连接的第四非弯折部。
在一些实施例中，沿所述极片组件的厚度方向，所述第一弯折部与所述第二弯折部位于所述第一区域的同一侧。
在一些实施例中，所述第一弯折部的弯折角度为ɑ，且80°≤ɑ≤100°。
在一些实施例中，所述第二非弯折部的长度小于所述极片组件的厚度。
在一些实施例中，所述第一弯折部的表面设置有绝缘件。
在一些实施例中，所述第二非弯折部与所述极片组件之间设置有绝缘件。
在一些实施例中，所述第二弯折部的弯折角度为β，且80°≤β≤100°。
在一些实施例中，所述第三非弯折部包括与所述第一区域连接的第二区域，所述第二区域的表面设置有绝缘件。
在一些实施例中，所述第四非弯折部的表面设置有极耳胶。
在一些实施例中，所述第一导电片为一体成型。
在一些实施例中，所述第二导电片为一体成型。
在一些实施例中，所述极片组件包括卷绕结构或叠片结构中的至少一种。
在一些实施例中，所述电极组件包括多个所述第一导电片，多个所 述第一导电片通过多个所述第二非弯折部连接。
为解决上述技术问题，第二方面，本申请实施例中提供了一种电化学装置，包括：如上述第一方面所述的电极组件。
在一些实施例中，所述电化学装置还包括：
包装壳，所述包装壳包括收容槽，所述电极组件中的所述极片组件、所述第一非弯折部、所述第一弯折部、所述第二非弯折部、所述第三非弯折部、所述第二弯折部收容于所述收容槽中；
所述第二导电片还包括位于所述包装壳外的伸出部，所述伸出部与所述第四非弯折部连接。
为解决上述技术问题，第三方面，本申请实施例提供了一种用电设备，包括：如上述第二方面所述的电化学装置。
与现有技术相比，本申请的有益效果是：区别于现有技术的情况，本申请提供的电极组件由于第一导电片仅存在一次弯折，不存在原来多次弯折带来的反弹力，因此第一导电片不容易反弹，有效减少了电极组件包装入壳的难度，大大提升了电化学装置的使用可靠性和安全性。
附图说明
一个或多个实施例中通过与之对应的附图中的图片进行示例性说明，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/模块表示为类似的元件/模块，除非有特别申明，附图中的图不构成比例限制。
图1是本申请实施例提供的一种电极组件的侧视结构示意图；
图2是本申请实施例提供的另一种电极组件的侧视结构示意图；
图3是本申请实施例提供的一种电化学装置的结构示意图；
图4是本申请实施例提供的一种电化学装置的另一种结构示意图；
图5是本申请实施例提供的一种用电设备的结构示意图。
具体实施方式
下面结合具体实施例对本申请进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本申请，但不以任何形式限制本申请。应当指出的是，对本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进。这些都属于本申请的保护范围。
为了使本申请的目的、技术方案及优点更加清楚明白，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。
需要说明的是，如果不冲突，本申请实施例中的各个特征可以相互结合，均在本申请的保护范围之内。另外，虽然在装置示意图中进行了功能模块划分，但是在某些情况下，可以以不同于装置中的模块划分。此外，本文所采用的“第一”、“第二”、“第三”等字样并不对数据和执行次序进行限定，仅是对功能和作用基本相同的相同项或相似项进行区分。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。
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。本说明书中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方式的目的，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各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
为了解决目前极耳结构电池的弯折结构容易出现反弹，影响电化学装置的使用可靠性和安全性等问题，本申请实施例提供了一种电极组件，其通过一次极耳弯折的方式替代传统中多次弯折的极耳结构，能够有效消除二折及以上多次弯折的反弹力/应力，从而一方面降低包裹在电极组件外部的胶纸脱落和外露的情况发生，另一方面可以减少电极组件的入壳难度，释放包装壳的头部空间，从而提升电化学装置的体积能量密度，且可减少因头部空间过小导致的极耳倒插等问题，大大提高电化学装置的可靠性和安全性。
具体地，下面结合附图，对本申请实施例作进一步阐述。
本申请实施例第一方面提供了一种电极组件，请参见图1，其示出了本申请实施例提供的一种电极组件的侧视结构，所述电极组件100包括：极片组件110、第一导电片120和第二导电片130。
所述第一导电片120包括：与所述极片组件110连接的第一非弯折部121，与所述第一非弯折部121连接的第一弯折部122，以及，与所述第一弯折部122连接的第二非弯折部123，其中，所述第二非弯折部123包括与所述第二导电片130连接的第一区域1230。本申请实施例提供的电极组件仅需要第一导电片120一次弯折，由弯折带来的反弹力较小，利于所述电极组件100的安装，同时有利于减小头部空间，提升电化学装置的体积能量密度，且可减少因头部空间过小导致的极耳倒插等问题，大大提高电化学装置的可靠性和安全性。
其中，所述第一区域1230与所述第二导电片130之间的连接可以是通过焊接、铆接、导电材料粘接等方式形成的，焊接方式包括激光焊 接、电阻焊接、超声焊接等方式，从而实现所述第一导电片120和所述第二导电片130之间的电连通，图1所示的第一区域1230为第二非弯折部123中焊接的区域，具体地，其电连通的方式可根据实际需要选择，不需要拘泥于本申请实施例的限定。
在一些实施例中，所述第二导电片130包括：与所述第二非弯折部123连接的第三非弯折部131，与所述第三非弯折部131连接的第二弯折部132，以及，与所述第二弯折部132连接的第四非弯折部133。
在一些实施例中，沿所述极片组件110的厚度H方向，所述第一弯折部122与所述第二弯折部132位于所述第一区域1230的同一侧。
在一些实施例中，所述第一弯折部122的弯折角度为ɑ，且80°≤ɑ≤100°。其中，弯折角度ɑ通过如下方式确定，将所述第一非弯折部121与所述第二非弯折部123分别延伸至相交，两者之间的夹角即为180°-ɑ。通过将第一弯折部122的弯折角度ɑ设置在80°至100°范围内，能够在进一步减小头部空间、提升体积能量密度的同时，降低第二非弯折部123与极片组件110之间干涉引发短路的风险。
在一些实施例中，所述第二非弯折部123的长度小于所述极片组件110的厚度H；第二非弯折部123的长度小于极片组件110的厚度H，能够将第一弯折部122的弯折角度ɑ设置为接近90°，从而更好地平衡体积能量密度的提升和第二非弯折部123与极片组件110之间干涉引发短路的风险。
请参阅图2，在一些实施例中，所述第一弯折部122的表面设置有绝缘件150。
在一些实施例中，所述第二非弯折部123与所述极片组件110之间设置有绝缘件150。通过在第二非弯折部123与极片组件110之间设置绝缘件150，能够进一步降低第二非弯折部123与极片组件110之间干 涉引发短路的风险。
在一些实施例中，所述第二弯折部132的弯折角度为β，且80°≤β≤100°；其中，弯折角度β通过如下方式确定，将所述第三非弯折部131与所述第四非弯折部133分别延伸至相交，两者之间的夹角即为180°-β。通过将第二弯折部132的弯折角度β设置在80°至100°范围内，能够便于第二导电片引出包装壳，缩短引出距离，从而提升电化学装置的质量能量密度。
在一些实施例中，所述第三非弯折部131包括与所述第一区域1230连接的第二区域1310，所述第二区域1310的表面设置有绝缘件150；通过在第二区域的表面设置绝缘件150，能够降低第一导电片与第二导电片之间连接处的尖锐部(例如，焊印)对包装壳的损伤，提升电化学装置的使用寿命。
在一些实施例中，绝缘件150包括绝缘胶带。
在一些实施例中，所述第四非弯折部133的表面设置有极耳胶160。
在一些实施例中，所述第一导电片120为一体成型。
在一些实施例中，所述第二导电片130为一体成型。
在一些实施例中，所述极片组件110包括卷绕结构或叠片结构中的至少一种。
在一些实施例中，所述电极组件100包括多个所述第一导电片120，多个所述第一导电片120通过多个所述第二非弯折部123连接。
在一些实施例中，所述极片组件110包括正极极片、负极极片和隔离膜，所述隔离膜位于所述正极极片与所述负极极片之间。
在一些实施例中，正极极片包括正极集流体和设置在正极集流体上的正极活性材料层。正极活性材料层可以位于正极集流体一侧或两侧上。在一些实施例中，正极集流体可以采用铝箔，当然，也可以采用本 领域常用的其他正极集流体。在一些实施例中，正极活性材料可以包括钴酸锂、锰酸锂、磷酸铁锂、磷酸锰铁锂、镍钴锰酸锂、镍钴铝酸锂或镍锰酸锂中的至少一种，上述正极活性材料可以经过掺杂和/或包覆处理。
在一些实施例中，负极极片可以包括负极集流体和设置在负极集流体上的负极活性材料层。负极活性材料层可以设置在负极集流体的一侧或两侧上。在一些实施例中，负极集流体可以采用铜箔、镍箔或碳基集流体中的至少一种。在一些实施例中，负极活性材料层可以包括负极活性材料。在一些实施例中，负极活性材料包括碳材料或硅基材料中的至少一种。在一些实施例中，碳材料包括石墨、硬碳、软碳中的至少一种；硅基材料包括硅、硅氧化合物、硅碳化合物或硅合金中的至少一种。
在制备本申请如图1所示的电极组件100时，首先，根据电芯设计要求，将连接所述极片组件110中正极极片或负极极片的第一导电片120沿所述极片组件110的厚度H方向自极耳区向非极耳区弯折ɑ角度；接着，再通过刀模裁切所述第一导电片120的头部(图1中第二非弯折部123平齐处)，以保持所述第一导电片120的头部平齐；然后，再将已弯折β角度的第二导电片130的底部(图1中第三非弯折部131下端)与所述第一导电片120头部对齐焊接或铆接在一起，从而形成所述第一区域1230和所述第二区域1310；同时在所述第一导电片120弯折处(第一弯折部122)、所述第二非弯折部123与所述极片组件110之间和连接处(即第二区域1310表面)设置绝缘件150(绿胶)，从而制造出所需的不易反弹，方便入壳的所述电极组件100。
本申请实施例第二方面提供了一种电化学装置，请参见图2，其示出了本申请实施例提供的一种电化学装置的结构，所述电化学装置200 包括：如上述实施例一所述的电极组件100。
所述电化学装置200为能够将化学能转变为电能的装置，它的具体实例包括所有种类的一次电池、二次电池、燃料电池、太阳能电池或电容。特别地，该电化学装置是锂二次电池，包括锂金属二次电池、锂离子二次电池、锂聚合物二次电池或锂离子聚合物二次电池。。
在一些实施例中，请参见图3，其示出了本申请实施例提供的一种电化学装置200的一种结构，所述电化学装置200还包括：
包装壳210，其包括收容槽(图未示，设置在所述包装壳210内部)，所述电极组件100中的所述极片组件110、所述第一非弯折部121、所述第一弯折部122、所述第二非弯折部123、所述第三非弯折部131、所述第二弯折部132收容于所述收容槽(图未示)中；
所述第二导电片130还包括位于所述包装壳110外的伸出部134，所述伸出部134与所述第四非弯折部133连接。
在本申请申请实施例中，电化学装置200采用如上述实施例一所述的电极组件100，能够有效减小电极组件100装入所述包装壳210的收容槽内的难度，同时能够释放所述包装壳210的头部空间，提升电化学装置200的能量密度，避免因头部空间过小导致极耳倒插的等问题，能够有效提高电化学装置200的可靠性和安全性。
本申请实施例第三方面提供了一种用电设备，请参见图4，其示出了本申请实施例提供的一种用电设备300的结构，所述用电设备300包括如上述实施例二所述的电化学装置200。
本申请的用电设备没有特别限定。在一些实施例中，本申请的用电设备包括但不限于，笔记本电脑、笔输入型计算机、移动电脑、电子书播放器、便携式电话、便携式传真机、便携式复印机、便携式打印机、 头戴式立体声耳机、录像机、液晶电视、手提式清洁器、便携CD机、迷你光盘、收发机、电子记事本、计算器、存储卡、便携式录音机、收音机、备用电源、电机、汽车、摩托车、助力自行车、自行车、照明器具、玩具、游戏机、钟表、电动工具、闪光灯、照相机、家庭用大型蓄电池和锂离子电容器等。
本申请实施例中提供了一种电极组件，能够应用在用电设备的电化学装置中，该电极组件包括极片组件、第一导电片和第二导电片，第一导电片包括：与所述极片组件连接的第一非弯折部，与所述第一非弯折部连接的第一弯折部，以及，与所述第一弯折部连接的第二非弯折部，其中，所述第二非弯折部包括与所述第二导电片连接的第一区域，本申请实施例提供的电极组件由于第一导电片仅存在一次弯折，不存在多次弯折带来的反弹力，因此第一导电片不容易反弹，有效减少了电极组件包装入壳的难度，大大提升了电化学装置的使用可靠性和安全性。
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，并存在如上所述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 (10)

  1. 一种电极组件，其特征在于，包括：极片组件、第一导电片和第二导电片；
    所述第一导电片包括：与所述极片组件连接的第一非弯折部，与所述第一非弯折部连接的第一弯折部，以及，与所述第一弯折部连接的第二非弯折部，其中，所述第二非弯折部包括与所述第二导电片连接的第一区域。
  2. 根据权利要求1所述的电极组件，其特征在于，
    所述第二导电片包括：与所述第二非弯折部连接的第三非弯折部，与所述第三非弯折部连接的第二弯折部，以及，与所述第二弯折部连接的第四非弯折部。
  3. 根据权利要求2所述的电极组件，其特征在于，
    沿所述极片组件的厚度方向，所述第一弯折部与所述第二弯折部位于所述第一区域的同一侧。
  4. 根据权利要求1所述的电极组件，其特征在于，所述电极组件满足以下条件的至少一者：
    a)所述第一弯折部的弯折角度为ɑ，且80°≤ɑ≤100°；
    b)所述第二非弯折部的长度小于所述极片组件的厚度；
    c)所述第一弯折部的表面设置有绝缘件。
  5. 根据权利要求1所述的电极组件，其特征在于，所述第二非弯折 部与所述极片组件之间设置有绝缘件。
  6. 根据权利要求2所述的电极组件，其特征在于，所述电极组件满足以下条件的至少一者：
    d)所述第二弯折部的弯折角度为β，且80°≤β≤100°；
    e)所述第三非弯折部包括与所述第一区域连接的第二区域，所述第二区域的表面设置有绝缘件；
    f)所述第四非弯折部的表面设置有极耳胶。
  7. 根据权利要求2所述的电极组件，其特征在于，所述电极组件满足以下条件的至少一者：
    i)所述第一导电片为一体成型；
    ii)所述第二导电片为一体成型；
    iii)所述极片组件包括卷绕结构或叠片结构中的至少一种；
    iv)所述电极组件包括多个所述第一导电片，多个所述第一导电片通过多个所述第二非弯折部连接。
  8. 一种电化学装置，其特征在于，包括：如权利要求权1-7中任一项所述的电极组件。
  9. 根据权利要求8所述的电化学装置，其特征在于，所述电化学装置还包括：
    包装壳，其包括收容槽，所述电极组件中的所述极片组件、所述第一非弯折部、所述第一弯折部、所述第二非弯折部、所述第三非弯折部、所述第二弯折部收容于所述收容槽中；
    所述第二导电片还包括位于所述包装壳外的伸出部，所述伸出部与所述第四非弯折部连接。
  10. 一种用电设备，其特征在于，包括：如权利要求权8-9中任一项所述的电化学装置。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116082970A (zh) * 2023-04-06 2023-05-09 宁德新能源科技有限公司 集成胶纸、电化学装置以及终端
WO2024087068A1 (zh) * 2022-10-26 2024-05-02 宁德新能源科技有限公司 电化学装置及电子设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117276816A (zh) * 2021-06-23 2023-12-22 东莞新能安科技有限公司 电化学装置和电子装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206332097U (zh) * 2016-11-23 2017-07-14 东莞新能源科技有限公司 一种二次电池电芯
CN211350808U (zh) * 2020-03-25 2020-08-25 宁德新能源科技有限公司 电化学装置及电子装置
WO2020256281A1 (ko) * 2019-06-17 2020-12-24 삼성에스디아이(주) 전극 조립체 및 이를 포함하는 이차 전지
CN212257553U (zh) * 2020-05-29 2020-12-29 江苏塔菲尔新能源科技股份有限公司 一种电池结构

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206332097U (zh) * 2016-11-23 2017-07-14 东莞新能源科技有限公司 一种二次电池电芯
WO2020256281A1 (ko) * 2019-06-17 2020-12-24 삼성에스디아이(주) 전극 조립체 및 이를 포함하는 이차 전지
CN211350808U (zh) * 2020-03-25 2020-08-25 宁德新能源科技有限公司 电化学装置及电子装置
CN212257553U (zh) * 2020-05-29 2020-12-29 江苏塔菲尔新能源科技股份有限公司 一种电池结构

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024087068A1 (zh) * 2022-10-26 2024-05-02 宁德新能源科技有限公司 电化学装置及电子设备
CN116082970A (zh) * 2023-04-06 2023-05-09 宁德新能源科技有限公司 集成胶纸、电化学装置以及终端
CN116082970B (zh) * 2023-04-06 2023-07-11 宁德新能源科技有限公司 集成胶纸、电化学装置以及终端

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