WO2018076452A1 - 极片及卷绕电芯 - Google Patents

极片及卷绕电芯 Download PDF

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Publication number
WO2018076452A1
WO2018076452A1 PCT/CN2016/108019 CN2016108019W WO2018076452A1 WO 2018076452 A1 WO2018076452 A1 WO 2018076452A1 CN 2016108019 W CN2016108019 W CN 2016108019W WO 2018076452 A1 WO2018076452 A1 WO 2018076452A1
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Prior art keywords
edge
pole piece
length direction
battery core
pole plate
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PCT/CN2016/108019
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English (en)
French (fr)
Inventor
吴飞
王可飞
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Publication of WO2018076452A1 publication Critical patent/WO2018076452A1/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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • 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 relates to the field of energy storage devices, and in particular to a pole piece and a wound battery core.
  • the laminated cell manufacturing solution represented by LG has a natural advantage.
  • the stepped shaped cell is usually realized by splicing the size of the cell.
  • the present application provides a pole piece and a wound core to simplify the processing of the wound core while improving space utilization.
  • a first aspect of the present application provides a pole piece having a longitudinal direction and a width direction perpendicular to each other, and one end of the pole piece in the length direction is a starting end, and the other end is a finishing end.
  • the pole piece is wound along the length direction;
  • the dimension of the pole piece in the width direction is gradually changed from the starting end to the finishing end, and the size is gradually reduced.
  • one side edge of the pole piece is a first edge, and the other side edge is a second edge, and an extension line of the first edge is a straight line.
  • the extension line of the second edge is a straight line, and the second edge is opposite to the length Tilt in direction.
  • the first edge is inclined with respect to the length direction.
  • the first edge and the second edge are symmetric about the length direction.
  • the first edge extends in the length direction.
  • the extension line of the second edge is a curve.
  • the first edge is inclined with respect to the length direction.
  • the first edge extends in the length direction.
  • one side edge of the pole piece is a first edge
  • the other side edge is a second edge
  • an extension line of the first edge and an extension line of the second edge are curves.
  • an extension line of at least one of the first edge and the second edge is a circular arc line.
  • the first edge and the second edge are symmetric about the length direction.
  • a second aspect of the present application provides a wound battery core comprising the pole piece of any of the above.
  • the present invention can process the core of the gradual thickness by improving the shape of the pole piece, so that the processing method of the wound core can adopt the one-time winding method, which can better adapt the battery to the installation of the electronic device. Space to improve space utilization while simplifying the processing of wound cores.
  • FIG. 1 is a schematic structural diagram of a pole piece according to an embodiment of the present application.
  • Figure 2 is a schematic view of the pole piece shown in Figure 1 when it is wound;
  • Figure 3 is a schematic view of the wound battery core formed after the pole piece shown in Figure 1 is wound;
  • Figure 4 is a schematic view of another winding core different from Figure 3;
  • FIG. 5 is a schematic diagram of installation of a wound battery core according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of another pole piece according to an embodiment of the present application.
  • Figure 7 is a schematic view of the wound battery core formed after winding the pole piece shown in Figure 6;
  • FIG. 8 is a schematic structural diagram of still another pole piece according to an embodiment of the present application.
  • Figure 9 is a schematic view of the pole piece shown in Figure 8 when it is wound;
  • Figure 10 is a schematic view of the wound cell formed after winding the pole piece shown in Figure 8.
  • FIG. 11 is a schematic structural diagram of still another pole piece according to an embodiment of the present application.
  • Figure 12 is a schematic view of the wound battery core formed after winding the pole piece shown in Figure 11;
  • Figure 13 is a schematic view showing the assembly of a thickness-graded cell formed by a conventional lamination.
  • an embodiment of the present application provides a pole piece, and the pole piece is wound.
  • the operation can form a wound cell.
  • the pole piece can be set as follows:
  • the pole piece has a longitudinal direction and a width direction perpendicular to each other, the pole piece is wound along the length direction thereof, and one end of the pole piece in the longitudinal direction is the starting end 10, and the other end is the finishing end 11;
  • the pole piece can include the size.
  • the change region 12 and the tab welding region 13 the size change region 12 is a region in which the dimension changes in the width direction, and the tab weld region 13 is a reserved portion, and its position on the entire pole piece can be flexibly set.
  • the tab welding region 13 herein may be a rectangular region or a non-rectangular region, and since the area thereof is relatively small, it may be substantially ignored when describing the trend of the dimensional change of the entire pole piece.
  • the pole piece When processing the battery core, the pole piece may be first subjected to irregular cutting, so that the structure of the pole piece satisfies the foregoing requirements. Then, the cut pole piece and the separator are assembled together, and the winding operation can be performed.
  • the width direction of the pole piece When winding, the width direction of the pole piece may be wound in the extending direction of the rotating shaft (that is, the direction in which the winding fold line a is located).
  • the portion having a large width on the pole piece is gradually rolled. Winding around the inner layer, the smaller pole segments are wound around the outer layer of the cell 1, thereby forming a cell 1 having a gradual thickness.
  • the embodiment of the present application can process the electric core with a gradual thickness by improving the shape of the pole piece, so that the processing method of the wound electric core can adopt the one-time winding method, which can make the battery core 1 better.
  • the ground is adapted to the installation space of the electronic equipment to improve space utilization, and at the same time, the processing technology of the wound core can be simplified.
  • the size difference between each layer of the pole piece can be controlled to be small, so that the entire battery cell 1 is mounted on a mobile phone, a notebook computer, a digital camera, etc. After the electronic device, the gap between the battery cell 1 and the mounting base 3 is smaller. As shown in FIG.
  • the conventional battery cell 1' is mounted on the mounting base 3' to form a large gap.
  • the pole piece provided in the embodiment of the present application can increase the capacity of the battery cell 1 and improve space utilization. rate.
  • the fixing of the battery core 1 is also more convenient, and the fixing strength is also increased.
  • the tab welding area 13 can be reserved on the pole piece, the tab welding area 13 may be located at the starting end 10 of the pole piece, and in order to improve the welding strength of the tab 2 on the pole piece, the tab welding area 13 may be set as a rectangular area, thereby maximizing the welding area of the tab 2 and the pole piece. In order to achieve the aforementioned objectives.
  • the specific structure of the pole piece can be adopted in various manners.
  • specific structural forms of several pole pieces are listed.
  • the specific structure of the pole piece is not limited to the following.
  • one side edge of the pole piece is a first edge 14 and the other side edge is a second edge 15 .
  • the extension line of the first edge 14 may be a straight line, a curved line, and an extension line of the first edge 14 . When it is a straight line, the first edge 14 may extend in the longitudinal direction or may be inclined with respect to the longitudinal direction.
  • the extension line of the second edge 15 may be a straight line, a curved line, and when the extension line of the first edge 15 is a straight line, the first edge 15 may extend in the length direction or may be inclined with respect to the length direction.
  • the extension lines of the first edge 14 and the second edge 15 of the pole piece are straight lines, and the first edge 14 extends along the length direction, and the second edge 15 is inclined with respect to the length direction. That is to say, in the process of winding the pole piece, the layers of the first edge 14 are always flush, so that the position of the largest thickness of the battery core 1 obtained after winding is on the battery core 1 and the first edge is provided.
  • the extension lines of the first edge 14 and the second edge 15 of the pole piece are straight lines, and the first edge 14 and the second edge 15 are both inclined with respect to the length direction, and the inclination of both The extent is different from each other.
  • the maximum thickness of such a cell 1 is biased toward one end of the cell 1.
  • the first edge 14 and the second edge 15 in each layer are contracted by a certain distance, so that the maximum thickness of the finally obtained cell 1 is located in the middle of the entire cell 1, not the end. In order to adapt to the installation requirements of more kinds of electronic equipment.
  • the extension lines of the first edge 14 and the second edge 15 of the pole piece are straight lines, and the first edge 14 and the second edge 15 are both inclined with respect to the length direction, and the degree of inclination of the two edges the same. That is, the first edge 14 and the second edge 15 have a symmetrical structure with respect to the longitudinal direction of the pole piece.
  • the maximum thickness of the cell 1 is located at the center of the cell 1, and the thickness of the cell 1 after winding is more uniform and more regular.
  • the extension lines of the first edge 14 and the second edge 15 of the pole piece are curved.
  • the thickness variation of the wound cell 1 is more diverse, thereby Adapt to a variety of structural installation bases 3.
  • an extension line of at least one of the first edge 14 and the second edge 15 is a circular arc line, thereby forming the battery cell 1 as shown in FIG.
  • the first edge 14 and the second edge 15 may also have a symmetrical structure with respect to the longitudinal direction of the pole piece.
  • the extension line of the first edge 14 is a straight line
  • the extension line of the second edge 15 is a curve
  • the extension line of the first edge 14 may be a curve
  • the extension line of the second edge 15 may be a straight line. Both of these methods can make the thickness variation trend of the two ends of the wound cell 1 different, so as to adapt to the irregularly shaped mounting base 3.
  • the extension line of the first edge 14 is a straight line
  • the extension line of the second edge 15 is a curved line
  • the first edge 14 may extend in the longitudinal direction as described above, or may be inclined with respect to the length direction.
  • a rectangular tab welding region 13 can be provided at the starting end 10 of the tab 2, thereby soldering the tab 2 to the pole 2
  • the tab welding area 13 is specifically shown in FIG. If the tab 2 needs to be disposed at the thicker end of the cell 1, it is not necessary to provide a rectangular tab welding region 13, but only the dimension changing region 12 is retained, so that the entire pole piece can be gradually reduced in length.
  • the tab 2 can be flexibly fixed at any feasible position of the pole piece, as shown in FIG. 4 .
  • the tab 2 and the cell 1 can be connected by a sealant 4.
  • the embodiment of the present application further provides a wound battery core, which includes the pole piece described in any of the above embodiments.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种极片及卷绕电芯（1），涉及储能器件技术领域，所述极片存在相互垂直的长度方向以及宽度方向，且所述极片在所述长度方向上的一端为起始端（10），另一端为收尾端（11），所述极片沿所述长度方向卷绕；沿着所述长度方向，自所述起始端（10）至所述收尾端（11），所述极片在所述宽度方向上的尺寸渐变，且所述尺寸逐渐减小。对该极片实施卷绕操作以后，最终形成的卷绕电芯为厚度渐变的电芯（1）。通过改进极片的形状就可以加工出厚度渐变的电芯（1），使得卷绕电芯（1）的加工工艺可以采用一次性卷绕的方式，以此简化卷绕电芯（1）的加工工艺。

Description

极片及卷绕电芯 技术领域
本申请涉及储能器件领域，尤其涉及一种极片及卷绕电芯。
背景技术
目前，电子技术飞速发展，集成化程度越来越高的工艺技术使手机、笔记本电脑、数码相机等移动电子设备不断朝着轻薄化发展，这些电子设备越来越小的内部空间使得对空间利用率的需求不断提高。尤其在轻薄笔记本电脑方面，以MacBook为代表的超轻薄刀锋型笔记本外形设计使得传统的规则四方体电芯设计无法满足其空间利用率的需求。新的异形电芯如台阶电芯的出现完美的解决了这个难题。
在目前的台阶电芯设计方案中，以LG为代表的叠片电芯制造方案有着天然优势。而卷绕制造工艺中，通常采用大小电芯拼接的方式来实现台阶型异形电芯。采用这种方式拼接的卷绕台阶电芯时，需要拼接不同尺寸的裸电芯，导致卷绕电芯的加工工艺比较繁琐。
发明内容
本申请提供了一种极片及卷绕电芯，以在提高空间利用率的同时简化卷绕电芯的加工工艺。
本申请的第一方面提供了一种极片，所述极片存在相互垂直的长度方向以及宽度方向，且所述极片在所述长度方向上的一端为起始端，另一端为收尾端，所述极片沿所述长度方向卷绕；
沿着所述长度方向，自所述起始端至所述收尾端，所述极片在所述宽度方向上的尺寸渐变，且所述尺寸逐渐减小。
优选地，在所述宽度方向上，所述极片的一侧边缘为第一边缘，另一侧边缘为第二边缘，所述第一边缘的延伸线为直线。
优选地，所述第二边缘的延伸线为直线，且第二边缘相对于所述长度 方向倾斜。
优选地，所述第一边缘相对于所述长度方向倾斜。
优选地，所述第一边缘和所述第二边缘关于所述长度方向呈对称结构。
优选地，所述第一边缘在所述长度方向上延伸。
优选地，所述第二边缘的延伸线为曲线。
优选地，所述第一边缘相对于所述长度方向倾斜。
优选地，所述第一边缘在所述长度方向上延伸。
优选地，在所述宽度方向上，所述极片的一侧边缘为第一边缘，另一侧边缘为第二边缘，所述第一边缘的延伸线和第二边缘的延伸线均为曲线。
优选地，所述第一边缘和所述第二边缘中的至少一者的延伸线为圆弧线。
优选地，所述第一边缘和所述第二边缘关于所述长度方向呈对称结构。
本申请的第二方面提供了一种卷绕电芯，其包括上述任一项所述的极片。
本申请提供的技术方案可以达到以下有益效果：
本申请所提供的极片中，沿着电芯的长度方向，自极片的起始端至收尾端，极片在自身宽度方向上的尺寸渐变，且该尺寸逐渐减小，对该极片实施卷绕操作以后，最终形成的卷绕电芯为厚度渐变的电芯。因此，本申请通过改进极片的形状就可以加工出厚度渐变的电芯，使得卷绕电芯的加工工艺可以采用一次性卷绕的方式，既能使电芯更好地适应电子设备的安装空间，以提高空间利用率，同时还可以简化卷绕电芯的加工工艺。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性的，并不能限制本申请。
附图说明
图1为本申请实施例所提供的一种极片的结构示意图；
图2为图1所示极片进行卷绕时的示意图；
图3为图1所示极片卷绕后形成的卷绕电芯的示意图；
图4为区别于图3的另一种卷绕电芯的示意图；
图5为本申请实施例提供的卷绕电芯的安装示意图；
图6为本申请实施例所提供的另一种极片的结构示意图；
图7为图6所示极片卷绕后形成的卷绕电芯的示意图；
图8为本申请实施例所提供的又一种极片的结构示意图；
图9为图8所示极片进行卷绕时的示意图；
图10为图8所示极片卷绕后形成的卷绕电芯的示意图；
图11为本申请实施例所提供的再一种极片的结构示意图；
图12为图11所示极片卷绕后形成的卷绕电芯的示意图；
图13为传统的叠片形成的厚度渐变的电芯的装配示意图。
附图标记：
1-电芯；
10-起始端；
11-收尾端；
12-尺寸变化区域；
13-极耳焊接区域；
14-第一边缘；
15-第二边缘；
1′-电芯；
2-极耳；
3-安装基础；
3′-安装基础；
4-密封胶。
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
具体实施方式
下面通过具体的实施例并结合附图对本申请做进一步的详细描述。
如图1-12所示，本申请实施例提供了一种极片，对该极片实施卷绕 操作可形成卷绕电芯。为了得到一种厚度渐变的卷绕电芯，可以对该极片进行如下设置：
极片存在相互垂直的长度方向以及宽度方向，极片沿此处的长度方向卷绕，且该极片在长度方向上的一端为起始端10，另一端为收尾端11；
沿着上述长度方向，自起始端10至收尾端11，极片在宽度方向上的尺寸渐变，且该尺寸逐渐减小。
具体地，自上述起始端10至收尾端11，极片的所有区域在宽度方向上的尺寸都可以满足前述变化关系，但是考虑到极片上通常还需要焊接极耳2，因此极片可包括尺寸变化区域12和极耳焊接区域13，尺寸变化区域12为宽度方向上尺寸发生变化的区域，极耳焊接区域13为预留部分，其在整个极片上的位置可以灵活设置。需要说明的是，此处的极耳焊接区域13可以是矩形区域，也可以是非矩形区域，由于其面积比较小，因此在描述整个极片的尺寸变化趋势时可以基本不考虑。
加工电芯时，可以首先对极片进行不规则裁片，使得极片的结构满足前述要求。然后将裁切后的极片与隔离膜组装到一起，即可进行卷绕操作。卷绕时，可以以极片的宽度方向为转轴的延伸方向(即图中的卷绕折线a所在的方向)进行卷绕，卷绕的过程中，极片上宽度尺寸较大的部位逐渐被卷绕到内层，宽度较小的极片段卷绕到电芯1的较外层，进而形成厚度渐变的电芯1。
由上述内容可知，本申请实施例通过改进极片的形状就可以加工出厚度渐变的电芯，使得卷绕电芯的加工工艺可以采用一次性卷绕的方式，既能使电芯1更好地适应电子设备的安装空间，以提高空间利用率，同时还可以简化卷绕电芯的加工工艺。另外，如图5所示，卷绕后的电芯1中，极片的每个分层之间的尺寸差距可以控制的较小，使得整个电芯1安装于手机、笔记本电脑、数码相机等电子设备上以后，电芯1与安装基础3之间的空隙更小。如图13所示，传统电芯1′安装在安装基础3′上会形成较大的空隙，相比之下，本申请实施例提供的极片可以增大电芯1的容量、提升空间利用率。同时，电芯1与安装基础之间的空隙更小以后，电芯1的固定也会更加方便，且固定强度也会随之提高。
前文中提到，可以在极片上预留极耳焊接区域13，该极耳焊接区域 13可以位于极片的起始端10上，而为了提高极耳2在极片上的焊接强度，可以将该极耳焊接区域13设置为矩形区域，以此尽量扩大极耳2与极片的焊接面积，进而达到前述目的。
可以理解地，具体实施例中，极片的具体结构可以采用多种方式，下文中列举几种极片的具体结构形式，当然，极片的具体结构并不限于下述的几种。
在宽度方向上，上述极片的一侧边缘为第一边缘14，另一侧边缘为第二边缘15，该第一边缘14的延伸线可以为直线、曲线，且第一边缘14的延伸线为直线时，第一边缘14可以在长度方向上延伸，也可以相对于长度方向倾斜。同理地，第二边缘15的延伸线可以为直线、曲线，且第一边缘15的延伸线为直线时，第一边缘15可以在长度方向上延伸，也可以相对于长度方向倾斜。
如图1-4所示，该极片的第一边缘14和第二边缘15的延伸线均为直线，且第一边缘14沿着长度方向延伸，第二边缘15相对于长度方向倾斜。也就是说，在卷绕极片的过程中，第一边缘14的各层始终是平齐的，使得卷绕后得到的电芯1中，厚度最大的位置处于电芯1上设置第一边缘14的一端。
如图6和图7所示，该极片的第一边缘14和第二边缘15的延伸线均为直线，第一边缘14和第二边缘15均相对于长度方向倾斜，并且两者的倾斜程度互不相同。此种电芯1的厚度最大区域偏向于电芯1的一端。卷绕时，每一层中的第一边缘14和第二边缘15均会内缩一定的距离，使得最终得到的电芯1的厚度最大位置位于整个电芯1的中间位置，而非端部，以此适应更多种电子设备的安装要求。
如图8-10所示，该极片的第一边缘14和第二边缘15的延伸线均为直线，第一边缘14和第二边缘15均相对于长度方向倾斜，并且两者倾斜的程度相同。也就是说，第一边缘14和第二边缘15关于极片的长度方向呈对称结构。此种实施例下，电芯1的厚度最大区域位于电芯1的中心位置处，卷绕后的电芯1的厚度变化更加均匀，更具有规律性。
如图11和图12所示，该极片的第一边缘14和第二边缘15的延伸线均为曲线。这样的话，卷绕后的电芯1的厚度变化就会更加多样化，以此 适应更多种结构的安装基础3。进一步地，第一边缘14和第二边缘15中的至少一者的延伸线为圆弧线，以此形成如图12所示的电芯1。当然，此种实施例下，第一边缘14和第二边缘15也可以关于极片的长度方向呈对称结构。
根据上述内容，可以得到多种电芯1，需要说明的是，根据上述内容所阐述的设置方式，还可以扩展至更多的类似方案中，以得到更多种结构多样、复杂的异形电芯，以此满足电芯1的各种安装环境，而这些方案都将落入本申请的保护范围内。例如，第一边缘14的延伸线是直线，第二边缘15的延伸线是曲线，相对应地，第一边缘14的延伸线可以是曲线，第二边缘15的延伸线可以是直线。此两种方式都可以使得卷绕后的电芯1两端的厚度变化趋势不相同，以适应形状比较不规则的安装基础3。同样地，第一边缘14的延伸线是直线，第二边缘15的延伸线是曲线时，第一边缘14可以在前文所述的长度方向上延伸，也可以相对于该长度方向倾斜。
采用上述各种结构时，如果极耳2需要设置在电芯1的较薄一端，则可以在极耳2的起始端10设置矩形的极耳焊接区域13，以此将极耳2焊接在该极耳焊接区域13上，具体如图3所示。如果极耳2需要设置在电芯1的较厚一端，则不需要设置矩形的极耳焊接区域13，而是仅保留尺寸变化区域12，使得整个极片的尺寸都可以沿长度方向逐渐减小，固定极耳2时可以灵活地将极耳2固定在极片的任意可行位置处，具体如图4所示。另外，极耳2与电芯1之间可以通过密封胶4进行连接。
本申请实施例还提供一种卷绕电芯，该卷绕电芯包括上述任一实施例所描述的极片。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (13)

  1. 一种极片，其特征在于，所述极片存在相互垂直的长度方向以及宽度方向，且所述极片在所述长度方向上的一端为起始端，另一端为收尾端，所述极片沿所述长度方向卷绕；
    沿着所述长度方向，自所述起始端至所述收尾端，所述极片在所述宽度方向上的尺寸渐变，且所述尺寸逐渐减小。
  2. 根据权利要求1所述的极片，其特征在于，在所述宽度方向上，所述极片的一侧边缘为第一边缘，另一侧边缘为第二边缘，所述第一边缘的延伸线为直线。
  3. 根据权利要求2所述的极片，其特征在于，所述第二边缘的延伸线为直线，且第二边缘相对于所述长度方向倾斜。
  4. 根据权利要求3所述的极片，其特征在于，所述第一边缘相对于所述长度方向倾斜。
  5. 根据权利要求4所述的极片，其特征在于，所述第一边缘和所述第二边缘关于所述长度方向呈对称结构。
  6. 根据权利要求3所述的极片，其特征在于，所述第一边缘在所述长度方向上延伸。
  7. 根据权利要求2所述的极片，其特征在于，所述第二边缘的延伸线为曲线。
  8. 根据权利要求7所述的极片，其特征在于，所述第一边缘相对于所述长度方向倾斜。
  9. 根据权利要求7所述的极片，其特征在于，所述第一边缘在所述长度方向上延伸。
  10. 根据权利要求1所述的极片，其特征在于，在所述宽度方向上，所述极片的一侧边缘为第一边缘，另一侧边缘为第二边缘，所述第一边缘的延伸线和第二边缘的延伸线均为曲线。
  11. 根据权利要求10所述的极片，其特征在于，所述第一边缘和所述第二边缘中的至少一者的延伸线为圆弧线。
  12. 根据权利要求10所述的极片，其特征在于，所述第一边缘和所 述第二边缘关于所述长度方向呈对称结构。
  13. 一种卷绕电芯，其特征在于，包括权利要求1至12中任一项所述的极片。
PCT/CN2016/108019 2016-10-25 2016-11-30 极片及卷绕电芯 Ceased WO2018076452A1 (zh)

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