技术领域Technical Field
本申请涉及电池领域，尤其涉及一种电极组件及含该电极组件的电芯。The present application relates to the field of batteries, and in particular to an electrode assembly and a battery cell containing the electrode assembly.
背景技术Background technique
目前可折叠的柔性器件正在逐渐成为研究热点，而传统的电池结构受立方体结构的限制，无法满足柔性器件的应用。目前将一个或多个裸电芯应用于柔性器件，但多个裸电芯需要引出多个极耳，不利于电解液的浸润，使得电芯极化偏大，进而降低了电芯的倍率性能及充放电速度。At present, foldable flexible devices are gradually becoming a research hotspot, and the traditional battery structure is limited by the cubic structure and cannot meet the application of flexible devices. At present, one or more bare cells are applied to flexible devices, but multiple bare cells need to lead out multiple tabs, which is not conducive to the infiltration of electrolyte, making the polarization of the cell larger, thereby reducing the rate performance and charge and discharge speed of the cell.
发明内容Summary of the invention
有鉴于此，有必要提供一种应用于柔性器件且倍率性能好的电极组件和电芯。In view of this, it is necessary to provide an electrode assembly and a battery cell that are applied to flexible devices and have good rate performance.
本申请的实施例的提供一种电极组件，包括：An embodiment of the present application provides an electrode assembly, comprising:
第一极片；First pole piece;
第二极片，所述第二极片的极性与所述第一极片的极性相反；及a second pole piece, the polarity of the second pole piece being opposite to the polarity of the first pole piece; and
隔离膜，设置在所述第一极片和所述第二极片之间；An isolation film, disposed between the first pole piece and the second pole piece;
所述第一极片、所述第二极片和隔离膜叠置后由两端向中间卷绕形成第一电芯单元和第二电芯单元；The first pole piece, the second pole piece and the isolation film are stacked and wound from both ends to the middle to form a first battery cell unit and a second battery cell unit;
所述电极组件还包括：The electrode assembly further comprises:
第一极耳，设置于所述第一极片上，且向所述第一电芯单元外延伸；及A first pole lug is disposed on the first pole piece and extends outward of the first battery cell unit; and
第二极耳，设置于所述第二极片上，且向所述第二电芯单元外延伸。The second pole lug is disposed on the second pole piece and extends outward of the second battery cell unit.
根据本申请的一些实施例，所述第一极耳或所述第二极耳平行于第一方向的对称轴与所述第一极片平行于所述第一方向的对称轴的间距L满足：0≤L≤W/2-z/2，z为所述第一极耳或所述第二极耳的宽度，W为所述第一极片或所述第二极片的宽度，所述第一方向为所述第一极片的长度方向。According to some embodiments of the present application, a spacing L between the symmetry axis of the first pole lug or the second pole lug parallel to the first direction and the symmetry axis of the first pole piece parallel to the first direction satisfies: 0≤L≤W/2-z/2, z is the width of the first pole lug or the second pole lug, W is the width of the first pole piece or the second pole piece, and the first direction is the length direction of the first pole piece.
根据本申请的一些实施例，所述第一极耳的延伸方向平行于所述第一电芯单元背离所述第二电芯单元的方向；所述第二极耳的延伸方向平行于所述第二电芯单元背离所述第一电芯单元的方向。According to some embodiments of the present application, an extension direction of the first pole ear is parallel to a direction in which the first battery cell unit departs from the second battery cell unit; an extension direction of the second pole ear is parallel to a direction in which the second battery cell unit departs from the first battery cell unit.
根据本申请的一些实施例，所述第一极片包括：According to some embodiments of the present application, the first pole piece includes:
第一集流体，包括相对的第一面和第二面；a first current collector including first and second opposing surfaces;
第一活性层，分别设置于所述第一面和所述第二面上；A first active layer is disposed on the first surface and the second surface respectively;
所述第一面上设置第一空箔区，所述第一极耳设置于所述第一空箔区露出的第一集流体上；A first empty foil area is provided on the first surface, and the first electrode tab is provided on the first current collector exposed in the first empty foil area;
所述第二极片包括：The second pole piece comprises:
第二集流体，包括相对的第三面和第四面；a second current collector including a third side and a fourth side facing each other;
第二活性层，分别设置于所述第三面和所述第四面上；A second active layer is disposed on the third surface and the fourth surface respectively;
所述第三面上设置第二空箔区，所述第二极耳设置于所述第二空箔区露出的第二集流体上。A second empty foil area is disposed on the third surface, and the second electrode tab is disposed on the second current collector exposed in the second empty foil area.
根据本申请的一些实施例，所述第一极耳的部分焊接于所述第一集流体上，且焊接区域靠近所述第一活性层；所述第二极耳的部分焊接于所述第二集流体上，且焊接区域靠近所述第二活性层。According to some embodiments of the present application, part of the first pole tab is welded to the first current collector, and the welding area is close to the first active layer; part of the second pole tab is welded to the second current collector, and the welding area is close to the second active layer.
根据本申请的一些实施例，所述第一面上间隔设置多个露出所述第一集流体的第三空箔区；所述第三面上间隔设置多个露出所述第二集流体的第四空箔区；所述第三空箔区和所述第四空箔区位于所述第一电芯单元和所述第二电芯单元的相接区域，所述第三空箔区和所述第四空箔区对应设置且位于所述第一极片和所述第二极片上相背的两侧。According to some embodiments of the present application, a plurality of third empty foil areas exposing the first current collector are arranged at intervals on the first surface; a plurality of fourth empty foil areas exposing the second current collector are arranged at intervals on the third surface; the third empty foil area and the fourth empty foil area are located in the connecting area of the first battery cell unit and the second battery cell unit, and the third empty foil area and the fourth empty foil area are arranged correspondingly and are located on opposite sides of the first pole sheet and the second pole sheet.
根据本申请的一些实施例，所述隔离膜包括第一隔离膜、第二隔离膜和第三隔离膜；所述第一隔离膜、所述第一极片、所述第二隔离膜、所述第二极片和所述第三隔离膜依次叠置；且所述第一隔离膜和所述第二隔离膜交错布置，投影接触或部分重叠，使所述第一电芯单元和所述第二电芯单元内所述第一极片和所述第二极片隔离。According to some embodiments of the present application, the isolation membrane includes a first isolation membrane, a second isolation membrane and a third isolation membrane; the first isolation membrane, the first pole piece, the second isolation membrane, the second pole piece and the third isolation membrane are stacked in sequence; and the first isolation membrane and the second isolation membrane are arranged alternately, with projected contact or partial overlap, so that the first pole piece and the second pole piece in the first battery cell unit and the second battery cell unit are isolated.
根据本申请的一些实施例，所述第一极耳的材质为镍，所述第二极耳的材质为铝。According to some embodiments of the present application, the material of the first pole lug is nickel, and the material of the second pole lug is aluminum.
本申请还提供一种电芯，包括气袋和上述电极组件，所述电极组件设置于所述气袋内，所述第一极耳和所述第二极耳伸出于所述气袋外。The present application also provides a battery cell, comprising an air bag and the above-mentioned electrode assembly, wherein the electrode assembly is arranged in the air bag, and the first electrode tab and the second electrode tab extend out of the air bag.
根据本申请的一些实施例，所述电芯还包括电解液，所述电解液沿第二方向渗入所述第一电芯单元和所述第二电芯单元内，所述第二方向平行于所述第一极片的宽度方向。According to some embodiments of the present application, the battery cell further includes an electrolyte, and the electrolyte penetrates into the first battery cell unit and the second battery cell unit along a second direction, and the second direction is parallel to a width direction of the first pole piece.
上述电极组件和上述电芯通过叠置的所述第一极片、所述第二极片和所述隔离膜由两端向中间卷绕形成第一电芯单元和第二电芯单元，且第一电芯单元和第二电芯单元共用所述第一极耳和所述第二极耳，提高了能量密度、倍率性能和充放电速度。The electrode assembly and the battery cell are formed into a first battery cell unit and a second battery cell unit by winding the stacked first electrode sheet, the second electrode sheet and the isolation film from both ends to the middle, and the first battery cell unit and the second battery cell unit share the first electrode tab and the second electrode tab, thereby improving the energy density, rate performance and charge and discharge speed.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为根据本申请一实施例的电芯的结构示意图。FIG1 is a schematic structural diagram of a battery cell according to an embodiment of the present application.
图2为图1所示的电芯当气袋打开时的结构示意图。FIG. 2 is a schematic diagram of the structure of the battery cell shown in FIG. 1 when the air bag is opened.
图3为图1所示的电芯卷绕成型第一电芯单元和第二电芯单元的结构示意图。FIG. 3 is a schematic structural diagram of a first battery cell unit and a second battery cell unit formed by winding the battery cell shown in FIG. 1 .
图4为图1所示的电芯中电极组件在另一实施例的结构示意图。FIG. 4 is a schematic structural diagram of an electrode assembly in the battery cell shown in FIG. 1 in another embodiment.
图5为根据本申请一实施例的电芯的第一极片的结构示意图。FIG5 is a schematic structural diagram of a first electrode piece of a battery cell according to an embodiment of the present application.
图6为图1所示的第一极片上设置第一极耳的结构示意图。FIG. 6 is a schematic structural diagram of a first pole lug provided on the first pole piece shown in FIG. 1 .
图7为根据本申请一实施例的电芯的第二极片的结构示意图。FIG. 7 is a schematic structural diagram of a second electrode sheet of a battery cell according to an embodiment of the present application.
图8为图1所示的电芯中第一极片、第二极片和隔离膜叠置时的结构示意图。FIG8 is a schematic diagram of the structure of the first pole piece, the second pole piece and the isolation film when they are stacked in the battery cell shown in FIG1 .
图9为图8所示的电芯中第一极片、第二极片和隔离膜的卷绕示意图。FIG. 9 is a schematic diagram of the winding of the first pole piece, the second pole piece and the isolation film in the battery cell shown in FIG. 8 .
图10为图2所示的电芯中第一电芯单元和第二电芯单元相接区域的结构示意图。FIG. 10 is a schematic structural diagram of the connecting region between the first battery cell unit and the second battery cell unit in the battery cell shown in FIG. 2 .
主要元件符号说明Main component symbols
电芯 200Battery Cell 200
气袋 201Airbag 201
电极组件 100，100aElectrode assembly 100, 100a
第一极片 10First pole piece 10
对称轴 1001Axis of symmetry 1001
第一集流体 11First collector 11
第一面 111First page 111
第一空箔区 1111First Empty Foil Area 1111
第三空箔区 1113The third empty foil area 1113
第二面 113Second side 113
第一活性层 13First active layer 13
第二极片 20Second pole piece 20
第二集流体 21Second Episode 21
第三面 211Page 3 211
第二空箔区 2111Second empty foil area 2111
第四空箔区 2113Fourth Empty Foil Area 2113
第四面 213Page 4 213
第二活性层 23Second active layer 23
隔离膜 30Isolation film 30
第一隔离膜 31First isolation film 31
第二隔离膜 33Second isolation film 33
第三隔离膜 35The third isolation film 35
第一极耳 40First tab 40
对称轴 401Axis of symmetry 401
第一极限位置 403First limit position 403
第二极限位置 405Second limit position 405
焊接区域 4001Welding area 4001
第二极耳 50Second tab 50
第一电芯单元 101First battery cell 101
第二电芯单元 103Second battery cell 103
第一方向 XFirst direction X
第二方向 YSecond direction Y
第三方向 ZThe third direction Z
如下具体实施方式将结合上述附图进一步说明本申请。The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
除非另有定义，本文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。本文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例的目的，不是旨在于限制本申请。Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
本申请一些实施方式提出一种电极组件，包括：Some embodiments of the present application provide an electrode assembly, including:
第一极片；First pole piece;
第二极片，所述第二极片的极性与所述第一极片的极性相反；及a second pole piece, the polarity of the second pole piece being opposite to the polarity of the first pole piece; and
隔离膜，设置在所述第一极片和所述第二极片之间；An isolation film, disposed between the first pole piece and the second pole piece;
所述第一极片、所述第二极片和隔离膜叠置后由两端向中间卷绕形成第一电芯单元和第二电芯单元；The first pole piece, the second pole piece and the isolation film are stacked and wound from both ends to the middle to form a first battery cell unit and a second battery cell unit;
第一极耳，设置于所述第一极片上，且向所述第一电芯单元外延伸；及A first pole lug is disposed on the first pole piece and extends outward of the first battery cell unit; and
第二极耳，设置于所述第二极片上，且向所述第二电芯单元外延伸。The second pole lug is disposed on the second pole piece and extends outward of the second battery cell unit.
上述电极组件通过叠置的所述第一极片、所述第二极片和所述隔离膜由两端向中间卷绕形成第一电芯单元和第二电芯单元，且第一电芯单元和第二电芯单元共用所述第一极耳和所述第二极耳，提高了能量密度、倍率性能和充放电速度。The electrode assembly is formed by winding the stacked first pole sheet, the second pole sheet and the isolation film from both ends to the middle to form the first battery cell unit and the second battery cell unit, and the first battery cell unit and the second battery cell unit share the first pole ear and the second pole ear, thereby improving the energy density, rate performance and charge and discharge speed.
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
请同时参阅图1、图2和图3，本申请的一实施例提出一种电芯200。所述电芯200包括气袋201和电极组件100。所述电极组件100设置于所述气袋201内。所述电极组件100包括第一极片10、第二极片20、隔离膜30、第一极耳40和第二极耳50。所述第一极片10和所述第二极片20的极性相反。例如，所述第一极片10的极性为阳极、所述第二极片20的极性为阴极。所述第一极耳40的材质为镍，所述第二极耳50的材质为铝。Please refer to Figures 1, 2 and 3 at the same time. One embodiment of the present application proposes a battery cell 200. The battery cell 200 includes an air bag 201 and an electrode assembly 100. The electrode assembly 100 is arranged in the air bag 201. The electrode assembly 100 includes a first pole piece 10, a second pole piece 20, a separator 30, a first pole ear 40 and a second pole ear 50. The polarities of the first pole piece 10 and the second pole piece 20 are opposite. For example, the polarity of the first pole piece 10 is an anode, and the polarity of the second pole piece 20 is a cathode. The material of the first pole ear 40 is nickel, and the material of the second pole ear 50 is aluminum.
所述隔离膜30设置在所述第一极片10和所述第二极片20之间。所述第一极片10、所述第二极片20和所述隔离膜30叠置后、由两端向中间卷绕形成第一电芯单元101和第二电芯单元103。如图1所示，所述两端均采用顺时针卷绕，但不限于此。例如，在其他实施例中，所述两端也可以采用同时逆时针卷绕。所述第一极耳40设置于所述第一极片10上，且向所述第一电芯单元101外延伸。所述第二极耳50设置于所述第二极片20上，且向所述第二电芯单元103外延伸。所述第一极耳40和所述第二极耳50伸出于所述气袋201外。The isolation film 30 is arranged between the first pole piece 10 and the second pole piece 20. After the first pole piece 10, the second pole piece 20 and the isolation film 30 are stacked, they are wound from both ends to the middle to form the first battery cell unit 101 and the second battery cell unit 103. As shown in FIG1 , both ends are wound clockwise, but are not limited to this. For example, in other embodiments, the two ends can also be wound counterclockwise at the same time. The first pole ear 40 is arranged on the first pole piece 10 and extends outward from the first battery cell unit 101. The second pole ear 50 is arranged on the second pole piece 20 and extends outward from the second battery cell unit 103. The first pole ear 40 and the second pole ear 50 extend out of the air bag 201.
上述电极组件100和电芯200通过卷绕成型第一电芯单元101和第二电芯单元103的两个构成裸电芯的单元，且电极组件100仅设置一个所述第一极耳40和一个所述第二极耳50，两个构成裸电芯的单元共用一个所述第一极耳40和一个所述第二极耳50，提高倍率性能和充放电速度。The above-mentioned electrode assembly 100 and battery cell 200 are formed by winding two units constituting a bare battery cell, namely a first battery cell unit 101 and a second battery cell unit 103, and the electrode assembly 100 is only provided with one first pole ear 40 and one second pole ear 50, and the two units constituting the bare battery cell share one first pole ear 40 and one second pole ear 50, thereby improving the rate performance and the charging and discharging speed.
请参阅图5和图6，为后续描述清晰，定义第一方向X为所述第一极片10的长度方向，第二方向Y为所述第一极片10的宽度方向，第三方向Z为所述第一极片10的厚度方向。Please refer to FIG. 5 and FIG. 6 . For the sake of clarity in the subsequent description, the first direction X is defined as the length direction of the first pole piece 10 , the second direction Y is defined as the width direction of the first pole piece 10 , and the third direction Z is defined as the thickness direction of the first pole piece 10 .
请参阅图3，所述第一极耳40的延伸方向平行于所述第一电芯单元101背离所述第二电芯单元103的方向。所述第二极耳50的延伸方向平行于所述第二电芯单元103背离所述第一电芯单元101的方向，但不限于此。例如，如图4所示，在另一实施例中，电极组件100a的第一极耳40和第二极耳50的延伸方向分别平行于所述第三方向Z。Referring to FIG. 3 , the extending direction of the first pole tab 40 is parallel to the direction in which the first battery cell 101 departs from the second battery cell 103. The extending direction of the second pole tab 50 is parallel to the direction in which the second battery cell 103 departs from the first battery cell 101, but is not limited thereto. For example, as shown in FIG. 4 , in another embodiment, the extending directions of the first pole tab 40 and the second pole tab 50 of the electrode assembly 100a are respectively parallel to the third direction Z.
请同时参阅图5、图6和图7，所述第一极片10包括第一集流体11和第一活性层13。所述第一集流体11包括在所述第三方向Z上相对的第一面111和第二面113。所述第一活性层13分别设置于所述第一面111和所述第二面113上。所述第二极片20包括第二集流体21和第二活性层23。所述第二集流体21包括在所述第三方向Z上相对的第三面211和第四面213。所述第二活性层23分别设置于所述第三面211和所述第四面213上。所述第一活性层13和所述第二活性层23的极性相反。例如，所述第一活性层13为阳极活性层，所述第二活性层23为阴极活性层。Please refer to Figures 5, 6 and 7 at the same time. The first pole piece 10 includes a first current collector 11 and a first active layer 13. The first current collector 11 includes a first surface 111 and a second surface 113 opposite to each other in the third direction Z. The first active layer 13 is respectively arranged on the first surface 111 and the second surface 113. The second pole piece 20 includes a second current collector 21 and a second active layer 23. The second current collector 21 includes a third surface 211 and a fourth surface 213 opposite to each other in the third direction Z. The second active layer 23 is respectively arranged on the third surface 211 and the fourth surface 213. The polarities of the first active layer 13 and the second active layer 23 are opposite. For example, the first active layer 13 is an anode active layer, and the second active layer 23 is a cathode active layer.
请参阅图8和图9，所述隔离膜30包括第一隔离膜31、第二隔离膜33和第三隔离膜35。所述第一隔离膜31、所述第一极片10、所述第二隔离膜33、所述第二极片20和所述第三隔离膜35依次叠置。所述第一隔离膜31和所述第二隔离膜33交错布置且投影接触或部分重叠，使所述第一电芯单元101和所述第二电芯单元103内所述第一极片10和所述第二极片20隔离。所述第一极片10的第二面113和所述第二极片20的第四面213相向设置。Please refer to Figures 8 and 9. The isolation film 30 includes a first isolation film 31, a second isolation film 33 and a third isolation film 35. The first isolation film 31, the first pole piece 10, the second isolation film 33, the second pole piece 20 and the third isolation film 35 are stacked in sequence. The first isolation film 31 and the second isolation film 33 are arranged alternately and the projections are in contact or partially overlapped, so that the first pole piece 10 and the second pole piece 20 in the first battery cell unit 101 and the second battery cell unit 103 are isolated. The second surface 113 of the first pole piece 10 and the fourth surface 213 of the second pole piece 20 are arranged facing each other.
请同时参阅图5、图6和图7，所述第一面111上设置第一空箔区1111。所述第一极耳40设置于所述第一空箔区1111露出的第一集流体11上，如图6所示。所述第三面211上设置第二空箔区2111，所述第二极耳50设置于所述第二空箔区2111露出的第二集流体21上。所述第一极耳40的部分焊接于所述第一集流体11上，且所述第一极耳40的焊接区域4001靠近所述第一活性层13。所述第二极耳50的部分焊接于所述第二集流体21上，且所述第二极耳50的焊接区域(图未示)靠近所述第二活性层23。可以理解，其他实施例中，所述第一极耳40或所述第二极耳50的焊接区域也可以在其他位置，只要便于所述第一极耳40和所述第二极耳50伸出所述电芯200的外侧即可。Please refer to FIG. 5, FIG. 6 and FIG. 7 simultaneously. A first empty foil area 1111 is provided on the first surface 111. The first pole tab 40 is provided on the first current collector 11 exposed by the first empty foil area 1111, as shown in FIG. 6. A second empty foil area 2111 is provided on the third surface 211, and the second pole tab 50 is provided on the second current collector 21 exposed by the second empty foil area 2111. A portion of the first pole tab 40 is welded to the first current collector 11, and a welding area 4001 of the first pole tab 40 is close to the first active layer 13. A portion of the second pole tab 50 is welded to the second current collector 21, and a welding area (not shown) of the second pole tab 50 is close to the second active layer 23. It can be understood that in other embodiments, the welding area of the first pole tab 40 or the second pole tab 50 can also be at other positions, as long as it is convenient for the first pole tab 40 and the second pole tab 50 to extend out of the outside of the battery cell 200.
请参阅图6，所述第一极耳40在所述第一集流体11上沿所述第二方向Y的设置位置，根据所述电芯200的阳极和阴极与外部元件的连接位置需要设定。所述第一极耳40平行于第一方向X的对称轴401与所述第一极片10的对称轴1001的间距L优选满足：0≤L≤(W/2-z/2)，z为所述第一极耳的宽度，W为所述第一极片10的宽度。所述第一极耳40的对称轴401的第一极限位置403和第二极限位置405与所述第一极片10的对称轴1001的间距为W/2-z/2。类似地，所述第二极耳50在平行于第一方向X的对称轴(图未示)与所述第一极片10的对称轴1001的间距L优选满足：0≤L≤(W/2-z/2)。Please refer to FIG. 6 , the setting position of the first pole tab 40 on the first current collector 11 along the second direction Y needs to be set according to the connection position of the anode and cathode of the battery cell 200 with the external element. The spacing L between the symmetry axis 401 of the first pole tab 40 parallel to the first direction X and the symmetry axis 1001 of the first pole sheet 10 preferably satisfies: 0≤L≤(W/2-z/2), z is the width of the first pole tab, and W is the width of the first pole sheet 10. The spacing between the first extreme position 403 and the second extreme position 405 of the symmetry axis 401 of the first pole tab 40 and the symmetry axis 1001 of the first pole sheet 10 is W/2-z/2. Similarly, the spacing L between the symmetry axis (not shown) of the second pole tab 50 parallel to the first direction X and the symmetry axis 1001 of the first pole sheet 10 preferably satisfies: 0≤L≤(W/2-z/2).
根据本申请的一个实施例，所述第一极耳的宽度z的可选范围为1-15mm；所述第一极片的宽度W的可选范围为20-200mm。优选的，所述第一极耳的宽度z的范围为5-6mm；所述第一极片的宽度W的可选范围为50-100mm。According to an embodiment of the present application, the width z of the first pole lug is in the range of 1-15 mm, and the width W of the first pole piece is in the range of 20-200 mm. Preferably, the width z of the first pole lug is in the range of 5-6 mm, and the width W of the first pole piece is in the range of 50-100 mm.
进一步地，当所述间距L＝0时，所述第一极耳40位于所述第一电芯单元101在所述第二方向Y的中间对称处，所述第二极耳50位于所述第二电芯单元103在所述第二方向Y的中间对称处，进一步提高所述电芯200的充放电速度和倍率性能。Furthermore, when the spacing L=0, the first pole lug 40 is located symmetrically at the middle of the first battery cell unit 101 in the second direction Y, and the second pole lug 50 is located symmetrically at the middle of the second battery cell unit 103 in the second direction Y, further improving the charge and discharge speed and rate performance of the battery cell 200.
请参阅图5、图7和图10，所述第一面111上间隔设置多个露出所述第一集流体11的第三空箔区1113。所述第三面211上间隔设置多个露出所述第二集流体21的第四空箔区2113。所述第三空箔区1113和所述第四空箔区2113位于所述第一电芯单元101和所述第二电芯单元103的相接区域，使所述第一电芯单元101和所述第二电芯单元103在相接区域沿所述第一方向X的尺寸减小。所述第三空箔区1113和所述第四空箔区2113对应设置且位于所述第一极片10和所述第二极片20上相背的两侧，使所述第一电芯单元101和所述第二电芯单元103能够实现能量交换，进而使所述电芯200在第一方向X尺寸减小的同时实现能量交换，提高了所述电芯200的能量密度。Please refer to FIG. 5, FIG. 7 and FIG. 10. A plurality of third empty foil areas 1113 exposing the first current collector 11 are arranged at intervals on the first surface 111. A plurality of fourth empty foil areas 2113 exposing the second current collector 21 are arranged at intervals on the third surface 211. The third empty foil area 1113 and the fourth empty foil area 2113 are located in the connecting area of the first battery cell unit 101 and the second battery cell unit 103, so that the size of the first battery cell unit 101 and the second battery cell unit 103 in the connecting area along the first direction X is reduced. The third empty foil area 1113 and the fourth empty foil area 2113 are arranged correspondingly and located on the opposite sides of the first pole sheet 10 and the second pole sheet 20, so that the first battery cell unit 101 and the second battery cell unit 103 can achieve energy exchange, thereby enabling the battery cell 200 to achieve energy exchange while reducing the size in the first direction X, thereby improving the energy density of the battery cell 200.
请参阅图2，所述电芯200还包括电解液(图未示)。所述电解液沿第二方向Y渗入所述第一电芯单元101和所述第二电芯单元103内，所述电解液从所述电芯200的卷绕面渗入，提高了所述电解液的渗透性能。Please refer to Fig. 2, the battery core 200 also includes an electrolyte (not shown). The electrolyte penetrates into the first battery core unit 101 and the second battery core unit 103 along the second direction Y, and the electrolyte penetrates from the winding surface of the battery core 200, thereby improving the permeability of the electrolyte.
上述电极组件100和上述电芯200通过叠置的所述第一极片10、所述第二极片20和所述隔离膜30由两端向中间卷绕形成第一电芯单元101和第二电芯单元103。且第一电芯单元101和第二电芯单元103共用所述第一极耳40和所述第二极耳50，提高了能量密度、倍率性能和充放电速度。The electrode assembly 100 and the battery cell 200 are wound from both ends to the middle by stacking the first pole sheet 10, the second pole sheet 20 and the separator 30 to form a first battery cell unit 101 and a second battery cell unit 103. The first battery cell unit 101 and the second battery cell unit 103 share the first pole tab 40 and the second pole tab 50, thereby improving energy density, rate performance and charge and discharge speed.
以上实施例仅用以说明本申请的技术方案而非限制，尽管参照较佳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，可以对本申请的技术方案进行修改或等同替换，而不脱离本申请技术方案的精神和实质。The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and essence of the technical solution of the present application.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/082261WO2021195910A1 (en) | 2020-03-31 | 2020-03-31 | Electrode assembly and battery |
| Publication Number | Publication Date |
|---|---|
| CN113795939A CN113795939A (en) | 2021-12-14 |
| CN113795939Btrue CN113795939B (en) | 2024-07-16 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080034556.6AActiveCN113795939B (en) | 2020-03-31 | 2020-03-31 | Electrode assembly and battery cell |
| Country | Link |
|---|---|
| CN (1) | CN113795939B (en) |
| WO (1) | WO2021195910A1 (en) |
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