WO2019200538A1 - 电芯及电池 - Google Patents

电芯及电池 Download PDF

Info

Publication number
WO2019200538A1
WO2019200538A1 PCT/CN2018/083408 CN2018083408W WO2019200538A1 WO 2019200538 A1 WO2019200538 A1 WO 2019200538A1 CN 2018083408 W CN2018083408 W CN 2018083408W WO 2019200538 A1 WO2019200538 A1 WO 2019200538A1
Authority
WO
WIPO (PCT)
Prior art keywords
current collector
active material
material layer
starting
segment
Prior art date
Application number
PCT/CN2018/083408
Other languages
English (en)
French (fr)
Inventor
董文明
Original Assignee
宁德新能源科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 EP18915357.0A priority Critical patent/EP3783724A4/en
Priority to PCT/CN2018/083408 priority patent/WO2019200538A1/zh
Priority to CN201880094577.XA priority patent/CN112272878B/zh
Publication of WO2019200538A1 publication Critical patent/WO2019200538A1/zh

Links

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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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

Definitions

  • the present invention relates to the field of electrochemistry, and more particularly to a battery cell and a battery.
  • an object of the present invention is to provide a battery core to at least reduce the deformation of the battery core and the wrinkling of the single-sided diaphragm, and improve the electrochemical performance and safety performance of the battery core.
  • the present invention provides a battery cell including a first pole piece and a second pole piece, the first pole piece including a first current collector and a first active body disposed on the first current collector a second layer comprising a second current collector and a second active material layer disposed on the second current collector; the first current collector having a region from the initial end to the first bend a first starting segment, the second current collector having a second starting segment from a starting end to a region where the first bending occurs; wherein the first starting segment faces the surface of the second starting segment
  • the first active material layer is not disposed, the surface of the second start segment facing the first start segment is not provided with the second active material layer, and the first start segment is away from the second start The surface of the segment is provided with the first active material layer.
  • the second starting segment is disposed away from the surface of the first starting segment.
  • the surface of the second starting segment facing away from the center of the cell is not provided with the second active material layer.
  • the surface of the second current collector facing the center of the cell is the A surface
  • the surface facing away from the center of the cell is the B surface
  • the A surface and the B surface are both provided with the a second active material layer, a starting point of the second active material layer of the A face being closer to a start end of the first current collector than a starting point of the second active material layer of the B face,
  • the end point of the second active material layer on the B surface is closer to the end of the first current collector with respect to the end point of the second active material layer on the A side.
  • the first current collector further has a first finishing section, and the first active material layer is not disposed on both sides of the first finishing section, and is opposite to the two sides of the first finishing section
  • the surface of the second current collector is not provided with the second active material layer.
  • the method further includes: a first tab electrically connected to the first current collector; and a second tab electrically connected to the second current collector, wherein the first tab And the second tab are disposed at the first start segment and the second start segment, respectively.
  • the method further includes: a first tab electrically connected to the first current collector; and a second tab electrically connected to the second current collector, wherein the first tab And the second pole are respectively disposed at a first finishing section of the first current collector and a second finishing section of the second current collector.
  • the second starting segment is disposed away from the surface of the first starting segment, and the second active material layer is disposed away from the surface of the cell center. Second active substance.
  • a plane between the first start segment and the second start segment divides the cell into a first half and a second half, wherein: the first half The number of layers of the first pole piece in the portion is equal to the number of layers of the first pole piece in the second half; and the number of layers of the second pole piece in the first half is equal to The number of layers of the second pole piece in the second half.
  • a battery comprising a packaging film, further comprising the above-described battery cells.
  • the beneficial technical effect of the invention is that the battery core of the invention can reduce the defects of the battery core deformation, the wrinkling of the single-sided film, and improve the electrochemical performance and safety performance of the battery core.
  • FIG. 1 is a schematic structural view of a battery cell in the prior art
  • FIG. 2 is a schematic structural view of a battery cell according to an embodiment of the present application.
  • FIG. 3 is a schematic structural view of a battery cell according to another embodiment of the present application.
  • FIG. 4 is a schematic structural view of a battery cell according to another embodiment of the present application.
  • FIG. 5 is a schematic structural view of a battery cell according to still another embodiment of the present application.
  • the length direction of the cell refers to the direction of the positive and negative poles of the battery
  • the direction of the width of the cell refers to the direction perpendicular to the positive and negative poles of the battery.
  • these cells have a large degree of safety risk.
  • the transverse tension of the isolation membrane per unit area during winding is also large, the probability of deformation of the battery core is large, and the single-sided area of the anode is also easy to wrinkle and release, resulting in deformation and electricity of the battery core.
  • the core cycle expansion deteriorates.
  • the short fat type battery it generally adopts the winding structure shown in FIG. 1 , and the electric core is wound into a four-layer isolation film, resulting in an initial energy density without advantages, and the battery core.
  • the upper and lower sides of the core are asymmetric structures, and the anode has a single-sided area.
  • the battery is easily bent toward the side with a small number of layers during charging and discharging, resulting in an increase in cell deformation and cyclic expansion, and an energy density after cycling is not dominant, so there is a large The degree of security risk.
  • the present application provides a battery cell 10.
  • a battery cell 10 includes a first pole piece 16 and a second pole piece 12, wherein the first pole piece 16 has a first current collector 18 and a first active material layer 42 disposed on the first current collector 18, and a second pole
  • the sheet 12 has a second current collector 14 and a second active material layer 40 disposed on the second current collector 14. Further, as shown in FIG.
  • the first current collector 18 has a first starting segment 22 from the starting end 44 to the region where the first bending occurs (this embodiment and the first starting segment 22 referred to in the present application) None of the bending regions are included, and the second current collector 14 has a second starting segment 20 from the starting end to the region where the first bending occurred (this embodiment and the second starting segment referred to in this application) 20 does not include a bending region), wherein the surface of the first starting segment 22 facing the second starting segment 20 is not provided with the first active material layer 42 and the surface of the second starting segment 20 facing the first starting segment 22
  • the second active material layer 40 is not provided, in other words, the surfaces of the first start segment 22 and the second start segment 20 facing each other are not provided with an active material layer to appear as a bare surface, and the first start segment 22 deviates from the first
  • the surface of the second starting section 20 is provided with a first active material layer 42.
  • the stress state of the innermost one-sided area (i.e., the first start section 22 and the second start section 20) of the first pole piece 16 and the second pole piece 12 of the battery cell 10 is open.
  • the force on one side of the pole piece can be released on the other side, so that the defect of the inner layer pole piece can be effectively alleviated, and the energy density of the battery core can be improved.
  • the surface of the second starting segment 20 facing away from the first starting segment 22 is provided with a second active material layer 40, such that in the embodiment shown in FIG.
  • the first starting segment 22 and the second starting segment 20 are both collector segments of the single-sided coated active material layer, and only the surfaces facing away from each other are coated with the active material layer, while the surfaces facing each other are uncoated.
  • the material layer thus appears as a bare surface, so that the stress state of the first starting segment 22 and the second starting segment 20 is an open-loop force, effectively reducing the problem of wrinkling of the inner pole piece.
  • the surface of the second starting segment 20 facing away from the center of the cell is not provided with the second active material layer 40, so that the second starting segment 20 is neither double-sided.
  • the double exposed surface current collector section of the active material is coated, which makes the stress state of the second initial stage 20 an open-loop force, effectively reducing the defects of the inner pole piece wrinkling. .
  • the surface of the second current collector 14 facing the center of the cell is the A surface
  • the surface facing away from the center of the cell is the B surface
  • the A surface and the B surface are both provided with the second activity.
  • the core center, which faces the B surface of the second starting section 20, is the first active material layer, so the larger the area of the second active material layer 40 spread on the B side of the second starting section 20, the better the A side is required.
  • the starting point 40A of the second active material layer 40 is as far as possible away from the starting end 44 of the first current collector; and the A surface faces the center of the battery core, and the first starting portion 22 faces the A surface of the second starting portion 20
  • the starting point 40B of the second active material layer 40 of the B-plane is required to be closer to the starting end 44 of the first current collector, so the design requirement is the second side of the A surface. the starting point of the active material layer 40 with respect to the start point 40A from the second side B of the active material layer 40B from 40 closer to the first 18 the starting end 44 of the fluid.
  • the first current collector 18 further has a first finishing section 32, and the first active material layer 42 is not disposed on both sides of the first finishing section 32, and the first finishing layer 42
  • the surface of the second current collector 14 opposite to each other of the segment 32 is not provided with the second active material layer 40.
  • the battery cell 10 further includes a first tab 28 electrically connected to the first current collector 18 and a second tab 26 electrically connected to the second current collector 14.
  • first tab 28 and the second tab 26 are disposed on the first start segment 22 and the second start segment 20, respectively.
  • first tab 28 and the second tab 26 are disposed at the first finishing section 32 and the second current collector of the first current collector 18, respectively.
  • the first finishing section 32 and the second finishing section 30 respectively comprise a first empty foil tail section and a second empty foil tail section, wherein the first empty foil tail section And both sides of the second empty foil tail are uncoated with an active material to present a bare surface, and the first tab 28 and the second tab 26 are respectively located on the first empty foil tail and the second empty foil tail.
  • the second current collector 14 includes a light foil segment 34 extending from the starting end on both sides of the exposed surface, and the starting end of the first current collector 18 and the second current collector 14 in FIGS. 2 and 3.
  • the starting ends are respectively located on both sides of the cell and are configured to be different in the configuration of the interposing structure.
  • the photo-foil section 34 is substantially aligned with the starting end of the first starting section 22 and sequentially wound.
  • the second tab 26 is disposed on the light foil segment 34, and the first tab 28 is disposed on the first starting segment 22.
  • the cell 10 further includes a diaphragm 48 disposed between the first current collector 18 and the second current collector 14 to space the two, wherein the diaphragm 48 is closed continuously in the first starting section 22. Both sides extend and are located only on one side of the light foil segment 34.
  • the innermost layer of the free-spaced separator is eliminated, so that the inner layer of the separator is closed and continuous, and the energy density of the cell 10 can be further improved.
  • a plane P between the first start segment 22 and the second start segment 20 divides the cell 10 into a first half P1 and a second half P2.
  • the number of layers of the first pole piece 16 in the first half P1 is equal to the number of layers of the first pole piece 16 in the second half P2
  • the number of layers of the second pole piece 12 in the first half P1 It is equal to the number of layers of the second pole piece 12 in the second half P2.
  • the first pole piece 16 is a cathode piece and the second pole piece 12 is an anode piece.
  • insulation is provided on the surface of the first bending region of the first current collector 18 and the second current collector 14 facing the center of the battery core. gum.
  • an insulating paste is provided at the ends of the first active material layer 42 and the second active material layer 40.
  • insulating glue is disposed on both sides of the first tab 28 and the second tab 26.
  • the center of the battery described in the present application refers to a first plane (not shown) passing through the starting end of the first current collector 18 and perpendicular to the first starting section 22, the first plane and the thickness direction of the tab 26 Parallel; a second plane (not shown) passing through the beginning end of the second current collector 14 and perpendicular to the second starting section 20, the second plane being parallel to the thickness direction of the tab 26; the first plane, the second
  • the geometric center of the plane, the first starting segment 22 and the second starting segment 20 is a battery center.

Landscapes

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

Abstract

本发明提供一种电芯及电池，该电芯包括第一极片和第二极片，第一极片包括第一集流体和设置在第一集流体上的第一活性物质层；第二极片包括第二集流体和设置在第二集流体上的第二活性物质层；第一集流体具有从起始端到第一次发生弯折的区域的第一起始段，第二集流体具有从起始端到第一次发生弯折的区域的第二起始段；其中，第一起始段面向第二起始段的表面不设置第一活性物质层，第二起始段面向第一起始段的表面不设置第二活性物质层，且第一起始段背离第二起始段的表面设置第一活性物质层。本发明的目的在于提供一种电芯，以至少减轻电芯变形、单面膜片打皱的不良情况，提升电芯的电化学性能和安全性能。

Description

电芯及电池 技术领域
本发明涉及电化学领域，更具体涉及一种电芯及电池。
背景技术
随着电池商业化的发展，市场对电池的需求越来越强烈，但电池变形膨胀带来的安全风险依然没有解决。
发明内容
针对相关技术中存在的问题，本发明的目的在于提供一种电芯，以至少减轻电芯变形、单面膜片打皱的不良情况，提升电芯的电化学性能和安全性能。
为实现上述目的，本发明提供了一种电芯，包括第一极片和第二极片，所述第一极片包括第一集流体和设置在所述第一集流体上的第一活性物质层；所述第二极片包括第二集流体和设置在所述第二集流体上的第二活性物质层；所述第一集流体具有从起始端到第一次发生弯折的区域的第一起始段，所述第二集流体具有从起始端到第一次发生弯折的区域的第二起始段；其中，所述第一起始段面向所述第二起始段的表面不设置所述第一活性物质层，所述第二起始段面向所述第一起始段的表面不设置所述第二活性物质层，且所述第一起始段背离所述第二起始段的表面设置所述第一活性物质层。
根据本发明的一个实施例，所述第二起始段背离所述第一起始段的表面设置所述第二活性物质层。
根据本发明的一个实施例，所述第二起始段背离电芯中心的表面不设置所述第二活性物质层。
根据本发明的一个实施例，所述第二集流体的面向电芯中心的表面为A面，背离电芯中心的表面为B面，所述A面与所述B面均设置有所述第 二活性物质层，所述A面的所述第二活性物质层的起点相对于所述B面的所述第二活性物质层的起点更靠近于所述第一集流体的起始端，所述B面的所述第二活性物质层的终点相对于所述A面的所述第二活性物质层的终点更靠近于所述第一集流体的收尾端。
根据本发明的一个实施例，所述第一集流体还具有第一收尾段，所述第一收尾段的两面不设置所述第一活性物质层，且与所述第一收尾段的两面相对的所述第二集流体的表面不设置所述第二活性物质层。
根据本发明的一个实施例，还包括：与所述第一集流体电连接的第一极耳；以及与所述第二集流体电连接的第二极耳，其中，所述第一极耳和所述第二极耳分别设置在所述第一起始段和所述第二起始段。
根据本发明的一个实施例，还包括：与所述第一集流体电连接的第一极耳；以及与所述第二集流体电连接的第二极耳，其中，所述第一极耳和所述第二极耳分别设置在所述第一集流体的第一收尾段和所述第二集流体的第二收尾段。
根据本发明的一个实施例，所述第二起始段背离所述第一起始段的表面设置所述第二活性物质层，所述第二起始段背离电芯中心的表面不设置所述第二活性物质。
根据本发明的一个实施例，位于所述第一起始段和所述第二起始段之间的平面将所述电芯分成第一半部和第二半部，其中：所述第一半部中的所述第一极片的层数等于所述第二半部中的所述第一极片的层数；以及所述第一半部中的所述第二极片的层数等于所述第二半部中的所述第二极片的层数。
根据本发明的一个实施例，提供了一种电池，包含包装膜，还包含以上所述的电芯。
本发明的有益技术效果在于：本发明的电芯能够减轻电芯变形、单面膜片打皱的不良情况，提升电芯的电化学性能和安全性能。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对 实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中的电芯的结构示意图；
图2为根据本申请的一个实施例的电芯的结构示意图；
图3为根据本申请的另一个实施例的电芯的结构示意图；
图4为根据本申请的另一个实施例的电芯的结构示意图；以及
图5为根据本申请的又一个实施例的电芯的结构示意图。
具体实施方式
以下将结合附图，对本发明的实施例进行具体描述。需要注意的是，以下各个实施例可以任意可能的方式相互组合或部分替换。
在实际应用中，通常需要各种类型的电芯以适应不同需求，例如矮胖型电芯(长度与宽度比≤1)、宽大电芯(宽度≥70mm、长度≥110mm)和超薄电芯(厚度≤2.3mm)等。其中，电芯长度方向是指平齐电芯正负极极耳的方向，电芯宽度方向是指垂直于电芯正负极极耳的方向。然而，这些电芯存在很大程度的安全风险。
对于宽大电芯和超薄电芯，卷绕时单位面积隔离膜所受横向张力亦较大，电芯变形概率较大，而阳极单面区也是容易打皱脱模，导致电芯变形和电芯循环膨胀恶化。
更严重地，如图1所示，对于矮胖型电芯，其通常采用图1所示的卷绕结构，电芯内卷空卷4层隔离膜，导致初始能量密度无优势，且电芯卷心上下为非对称结构，阳极存在单面区，电芯充放电过程中易向层数少的一侧弯曲，导致电芯变形和循环膨胀增加，循环后能量密度无优势，因此存在很大程度的安全风险。
为了克服以上问题，本申请提供一种电芯10。首先参照图2，其例示了根据本申请的一个实施例的电芯10的示例性结构。电芯10包括第一极片16和第二极片12，其中，第一极片16具有第一集流体18和设置在第一集流体18上的第一活性物质层42，且第二极片12具有第二集流体14 和设置在第二集流体14上的第二活性物质层40。进一步地，如图2所示，第一集流体18具有从起始端44到第一次发生弯折的区域的第一起始段22(此实施例及本申请中所涉及的第一起始段22均不包含弯折区域)，且第二集流体14具有从起始端到第一次发生弯折的区域的第二起始段20(此实施例及本申请中所涉及的第二起始段20均不包含弯折区域)，其中，第一起始段22的面向第二起始段20的表面不设置第一活性物质层42，第二起始段20的面向第一起始段22的表面不设置第二活性物质层40，换句话说，第一起始段22和第二起始段20的面向彼此的表面未设置活性物质层而呈现为裸露表面，并且第一起始段22的背离第二起始段20的表面设置第一活性物质层42。
在上述实施例中，电芯10的第一极片16和第二极片12的最内层单面区(即，第一起始段22和第二起始段20)的受力状态为开环受力，极片一侧受到的力可以在另一侧释放，因此能够有效地减轻内层极片打皱的不良情况，同时还可提高电芯能量密度。
如图3所示，在本申请的一个实施例中，第二起始段20的背离第一起始段22的表面设置有第二活性物质层40，使得在图3所示的实施例中，第一起始段22和第二起始段20均为单面涂覆活性物质层的集流体段，二者仅背向彼此的表面涂覆有活性物质层，而面向彼此的表面未涂覆活性物质层从而呈现为裸露表面，从而使得第一起始段22和第二起始段20的受力状态为开环受力，有效地减轻内层极片打皱的不良情况。
如图4所示，在本申请的另一个实施例中，第二起始段20的背离电芯中心的表面不设置第二活性物质层40，使得第二起始段20为双面均未涂覆活性物质的双裸露表面集流体段，这使得第二起始段20的受力状态为开环受力，有效地减轻内层极片打皱的不良情况。。
参照图2，在本申请的一个实施例中，第二集流体14的面向电芯中心的表面为A面，背离电芯中心的表面为B面，A面与B面均设置有第二活性物质层40，A面的第二活性物质层40的起点40A 起相对于B面的第二活性物质层40的起点40B 起更靠近于第一集流体18的起始端44，由于B面背离电芯中心，与第二起始段20的B面相面对的是第一活性物质层，所以 第二活性物质层40在第二起始段20的B面铺展的面积越大越好，要求A面的第二活性物质层40的起点40A 起远离第一集流体的起始端44越远越好；而A面面向电芯中心，第一起始段22面向第二起始段20的A面上设置有第一活性物质层，为了更高的能量密度，要求B面的第二活性物质层40的起点40B 起越靠近第一集流体的起始端44越好，所以设计要求为A面的第二活性物质层40的起点40A 起相对于B面的第二活性物质层40的起点40B 起更靠近于第一集流体18的起始端44。并且B面的第二活性物质层40的终点40B 终相对于A面的第二活性物质层40的终点40A 终更靠近于第一集流体18的收尾端46，由于40A 终相对于40B 终更靠近于电芯10的外部，而收尾端46很容易刺破第二集流体14与电芯10外表面的包装袋相接触，由于第二集流体14多为铜箔，而包装袋中含有铝箔层，刺破后容易在电解液存在的情况下，很容易引起第二集流体14的铜箔与包装袋中的铝箔层产生电化学腐蚀，所以技术要求B面的第二活性物质层40的终点40B 终相对于A面的第二活性物质层40的终点40A 终更靠近于第一集流体18的收尾端46，从而对收尾端46起到保护作用。
如图3所示，在本申请的一个实施例中，第一集流体18还具有第一收尾段32，第一收尾段32的两面均不设置第一活性物质层42，且与第一收尾段32的两面相对的第二集流体14的表面不设置第二活性物质层40。
根据本申请实施例，电芯10还包括与第一集流体18电连接的第一极耳28和与第二集流体14电连接的第二极耳26。如图2所示，在本申请的一个示例性实施例中，第一极耳28和第二极耳26分别设置在第一起始段22和第二起始段20上。或者，如图3所示，在本申请的另一个示例性实施例中，第一极耳28和第二极耳26分别设置在第一集流体18的第一收尾段32和第二集流体14的第二收尾段30上。
如图3所示，在本申请的一个实施例中，第一收尾段32和第二收尾段30分别包括第一空箔尾段和第二空箔尾段，其中，第一空箔尾段和第二空箔尾段的两侧均未涂覆活性物质而呈现为裸露表面，第一极耳28和第二极耳26分别位于第一空箔尾段和第二空箔尾段上。
如图4所示，第二集流体14包括由起始端延伸的两侧均为裸露表面的 光箔段34，与图2和图3中第一集流体18的起始端和第二集流体14的起始端分别位于电芯两侧而构造成对插结构的构造不同，在图4所示的实施例中，光箔段34与第一起始段22的起始端大致对齐且顺次卷绕，第二极耳26设置在光箔段34上，第一极耳28设置在第一起始段22上。
如图5所示，电芯10还包括设置在第一集流体18与第二集流体14之间以将二者间隔开的隔膜48，其中，隔膜48封闭连续地在第一起始段22的两侧延伸且仅位于光箔段34的一侧。在该实施例中，通过变更隔离膜卷绕方式，取消最内层空卷隔离膜，使得内层隔离膜为封闭连续的，能够进一步提高电芯10的能量密度。
在本申请的一个实施例中，如图2所示，位于第一起始段22和第二起始段20之间的平面P将电芯10分成第一半部P1和第二半部P2。其中，第一半部P1中的第一极片16的层数等于第二半部P2中的第一极片16的层数，并且第一半部P1中的第二极片12的层数等于第二半部P2中的第二极片12的层数。
在本申请的一个实施例中，第一极片16为阴极片，并且第二极片12为阳极片。
另外，在本申请的一个实施例中，如图2至图5所示，在第一集流体18和第二集流体14的第一个弯折区域的面向电芯中心的表面上设置有绝缘胶。本申请的另一个实施例中，如图2至图5所示，在第一活性物质层42和第二活性物质层40的末端设置有绝缘胶。本申请的另一个实施例中，如图2至图5所示，在第一极耳28和第二极耳26的两侧设置有绝缘胶。
本申请中所描述的电池中心是指，经过第一集流体18的起始端且与第一起始段22垂直的第一平面(图中未示出示出)，第一平面与极耳26厚度方向平行；经过第二集流体14的起始端且与第二起始段20垂直的第二平面(图中未示出示出)，第二平面与极耳26厚度方向平行；第一平面、第二平面、第一起始段22与第二起始段20四者围成图形的几何中心即为电池中心。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于 本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种电芯，其特征在于，包括第一极片和第二极片，所述第一极片包括第一集流体和设置在所述第一集流体上的第一活性物质层；所述第二极片包括第二集流体和设置在所述第二集流体上的第二活性物质层；
    所述第一集流体具有从起始端到第一次发生弯折的区域的第一起始段，所述第二集流体具有从起始端到第一次发生弯折的区域的第二起始段；
    其中，所述第一起始段面向所述第二起始段的表面不设置所述第一活性物质层，所述第二起始段面向所述第一起始段的表面不设置所述第二活性物质层，且所述第一起始段背离所述第二起始段的表面设置所述第一活性物质层。
  2. 根据权利要求1所述的电芯，其特征在于，所述第二起始段背离所述第一起始段的表面设置所述第二活性物质层。
  3. 根据权利要求1所述的电芯，其特征在于，所述第二起始段背离电芯中心的表面不设置所述第二活性物质层。
  4. 根据权利要求1所述的电芯，其特征在于，所述第二集流体的面向电芯中心的表面为A面，背离电芯中心的表面为B面，所述A面与所述B面均设置有所述第二活性物质层，所述A面的所述第二活性物质层的起点相对于所述B面的所述第二活性物质层的起点更靠近于所述第一集流体的起始端，所述B面的所述第二活性物质层的终点相对于所述A面的所述第二活性物质层的终点更靠近于所述第一集流体的收尾端。
  5. 根据权利要求1所述的电芯，其特征在于，所述第一集流体还具有第一收尾段，所述第一收尾段的两面不设置所述第一活性物质层，且与所述第一收尾段的两面相对的所述第二集流体的表面不设置所述第二活性物质层。
  6. 根据权利要求1所述的电芯，其特征在于，还包括：
    与所述第一集流体电连接的第一极耳；以及
    与所述第二集流体电连接的第二极耳，
    其中，所述第一极耳和所述第二极耳分别设置在所述第一起始段和所 述第二起始段。
  7. 根据权利要求5所述的电芯，其特征在于，还包括：
    与所述第一集流体电连接的第一极耳；以及
    与所述第二集流体电连接的第二极耳，
    其中，所述第一极耳和所述第二极耳分别设置在所述第一集流体的第一收尾段和所述第二集流体的第二收尾段。
  8. 根据权利要求6所述的电芯，其特征在于，所述第二起始段背离所述第一起始段的表面设置所述第二活性物质层，所述第二起始段背离电芯中心的表面不设置所述第二活性物质。
  9. 根据权利要求1所述的电芯，其特征在于，位于所述第一起始段和所述第二起始段之间的平面将所述电芯分成第一半部和第二半部，其中：
    所述第一半部中的所述第一极片的层数等于所述第二半部中的所述第一极片的层数；以及
    所述第一半部中的所述第二极片的层数等于所述第二半部中的所述第二极片的层数。
  10. 一种电池，其特征在于，包含包装膜，还包含权利要求1-9中任一项所述的电芯。
PCT/CN2018/083408 2018-04-17 2018-04-17 电芯及电池 WO2019200538A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18915357.0A EP3783724A4 (en) 2018-04-17 2018-04-17 BATTERY CELL AND BATTERY
PCT/CN2018/083408 WO2019200538A1 (zh) 2018-04-17 2018-04-17 电芯及电池
CN201880094577.XA CN112272878B (zh) 2018-04-17 2018-04-17 电芯及电池

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/083408 WO2019200538A1 (zh) 2018-04-17 2018-04-17 电芯及电池

Publications (1)

Publication Number Publication Date
WO2019200538A1 true WO2019200538A1 (zh) 2019-10-24

Family

ID=68240529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/083408 WO2019200538A1 (zh) 2018-04-17 2018-04-17 电芯及电池

Country Status (3)

Country Link
EP (1) EP3783724A4 (zh)
CN (1) CN112272878B (zh)
WO (1) WO2019200538A1 (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012043753A (ja) * 2010-08-23 2012-03-01 Toyota Motor Corp リチウムイオン二次電池とその製造方法
CN106058296A (zh) * 2016-08-05 2016-10-26 东莞新能源科技有限公司 一种二次电池电芯
CN205828573U (zh) * 2016-06-24 2016-12-21 宁德新能源科技有限公司 卷绕式电芯
CN206532840U (zh) * 2016-12-27 2017-09-29 宁德新能源科技有限公司 一种卷绕式电芯
CN107546404A (zh) * 2016-06-28 2018-01-05 宁德新能源科技有限公司 卷绕式电芯

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005196974A (ja) * 2003-12-26 2005-07-21 Hitachi Maxell Ltd 二次電池
JP4968182B2 (ja) * 2008-05-29 2012-07-04 ソニー株式会社 巻回電極体及び非水電解質二次電池
KR101106377B1 (ko) * 2009-07-16 2012-01-18 삼성에스디아이 주식회사 이차 전지
CN206401456U (zh) * 2016-12-27 2017-08-11 宁德新能源科技有限公司 一种卷绕式电芯
CN206697567U (zh) * 2017-03-31 2017-12-01 宁德新能源科技有限公司 卷绕式电芯
CN206878126U (zh) * 2017-06-23 2018-01-12 宁德时代新能源科技股份有限公司 二次电池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012043753A (ja) * 2010-08-23 2012-03-01 Toyota Motor Corp リチウムイオン二次電池とその製造方法
CN205828573U (zh) * 2016-06-24 2016-12-21 宁德新能源科技有限公司 卷绕式电芯
CN107546404A (zh) * 2016-06-28 2018-01-05 宁德新能源科技有限公司 卷绕式电芯
CN106058296A (zh) * 2016-08-05 2016-10-26 东莞新能源科技有限公司 一种二次电池电芯
CN206532840U (zh) * 2016-12-27 2017-09-29 宁德新能源科技有限公司 一种卷绕式电芯

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3783724A4 *

Also Published As

Publication number Publication date
EP3783724A4 (en) 2021-05-05
CN112272878A (zh) 2021-01-26
CN112272878B (zh) 2022-05-24
EP3783724A1 (en) 2021-02-24

Similar Documents

Publication Publication Date Title
US11611111B2 (en) Wound-type battery cell
WO2018036489A1 (zh) 一种卷绕式电芯
US11108118B2 (en) Cell and electrochemical device
US11611100B2 (en) Coiled cell
US11127982B2 (en) Electrode assembly and battery with sectioned active layers
CN207572477U (zh) 电极组件和二次电池
CN209981369U (zh) 一种圆柱型电池
US11380964B2 (en) Wound electrode assembly
CN206098526U (zh) 卷绕式二次电芯
US11024868B2 (en) Secondary battery cell
WO2017010046A1 (ja) 捲回型電池
WO2023071835A1 (zh) 一种电芯、电池及电子设备
KR20230009442A (ko) 극 단편, 권취형 배터리 셀, 및 배터리
WO2023124570A1 (zh) 极片、卷芯和电池
KR20230007504A (ko) 극(pole), 와인딩-타입(winding-type) 배터리 셀, 및 배터리
WO2019200538A1 (zh) 电芯及电池
CN116581395A (zh) 卷绕式电芯
CN215988907U (zh) 卷芯和电池
CN212676341U (zh) 锂离子电池
KR102541535B1 (ko) 단차 보정 부재를 포함하는 롤 압연 장치 및 이를 사용한 압연 방법
CN109952680B (zh) 包括圆柱形果冻卷的锂二次电池
CN117059906A (zh) 卷绕式电芯
CN218498099U (zh) 一种正极片和电芯
CN218101398U (zh) 一种方形锂电池的卷绕电芯结构
CN219267840U (zh) 电芯及二次电池

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: 18915357

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2018915357

Country of ref document: EP

Effective date: 20201117