WO2024082814A1 - 一种电极组件及电池 - Google Patents
一种电极组件及电池 Download PDFInfo
- Publication number
- WO2024082814A1 WO2024082814A1 PCT/CN2023/114781 CN2023114781W WO2024082814A1 WO 2024082814 A1 WO2024082814 A1 WO 2024082814A1 CN 2023114781 W CN2023114781 W CN 2023114781W WO 2024082814 A1 WO2024082814 A1 WO 2024082814A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- electrode assembly
- active material
- layer
- glue layer
- Prior art date
Links
- 239000011149 active material Substances 0.000 claims abstract description 45
- 239000010410 layer Substances 0.000 claims description 89
- 239000012790 adhesive layer Substances 0.000 claims description 49
- 239000003292 glue Substances 0.000 claims description 46
- 230000001788 irregular Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 238000009831 deintercalation Methods 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 5
- 239000007774 positive electrode material Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- H01M10/05—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
- 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
- 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
-
- 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 battery technology, and in particular to an electrode assembly and a battery.
- Lithium deposition on the second pole piece is one of the important factors affecting battery safety.
- a tab slot is usually provided on the second pole piece to accommodate a preset tab, which results in no negative electrode active material in the tab slot.
- lithium ions are easily deposited on the edge of the tab slot after being deintercalated from the first pole piece and form lithium dendrites, affecting the safety of the battery.
- the embodiments of the present application provide an electrode assembly and a battery to solve the problem of low battery safety in traditional technologies.
- An embodiment of the present application provides an electrode assembly, comprising a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm is disposed between the first pole piece and the second pole piece;
- the first pole piece includes a first current collector and a first active material layer located on the first current collector, and a groove is provided on a surface of the first active material layer on one side corresponding to the second pole piece;
- the second pole sheet includes a second current collector, a second active material layer and a preset pole ear, the second active material layer is provided with a pole ear groove for accommodating the preset pole ear, and the projection of the pole ear groove in the thickness direction of the electrode assembly is located within the projection area of the groove in the thickness direction of the electrode assembly.
- the electrode assembly further includes a first glue layer, which is disposed in the groove, and a projection of the first glue layer in a thickness direction of the electrode assembly covers the tab groove.
- the electrode assembly further includes a second adhesive layer, wherein the second adhesive layer covers the preset electrode tab, and at least a portion of the second adhesive layer is embedded in the groove.
- a projection of the second adhesive layer in the thickness direction of the electrode assembly covers the tab groove.
- the electrode assembly further includes a first glue layer, wherein a projection of the first glue layer in a thickness direction of the electrode assembly covers the second glue layer.
- the second adhesive layer includes an extension portion, which is a portion of the second adhesive layer abutting against the second active material layer, and the extension portion is provided with a plurality of through holes.
- the shape of the through hole includes at least one of a circle, an ellipse, a polygon and an irregular shape.
- the length of the second adhesive layer is less than the length of the tab slot by a difference of 0 mm. To 2 mm.
- the width of the second adhesive layer is smaller than the width of the tab groove by a difference ranging from 0 mm to 2 mm.
- the length of the second adhesive layer is smaller than the length of the tab groove by a difference ranging from 0 mm to 2 mm; and the width of the second adhesive layer is smaller than the width of the tab groove by a difference ranging from 0 mm to 2 mm.
- the electrode assembly further includes a first glue layer, and the depth of the groove is greater than the sum of the thickness of the first glue layer and the thickness of the second glue layer.
- the width of the groove is greater than the width of the first adhesive layer by 6 mm to 20 mm.
- the length of the groove is greater than the length of the first adhesive layer by 6 mm to 20 mm.
- the width of the groove is greater than the width of the first adhesive layer by 6 mm to 20 mm; and the length of the groove is greater than the length of the first adhesive layer by 6 mm to 20 mm.
- An embodiment of the present application also provides a battery, comprising the above-mentioned electrode assembly.
- the first pole piece and the second pole piece are relatively spaced apart by a diaphragm
- a pole lug groove is provided on the second active material layer of the second pole piece, so that a preset pole lug is fixed on the second current collector
- a groove is provided in the first active material layer of the first pole piece opposite to the pole lug groove, so that the projection of the pole lug groove in the thickness direction of the electrode assembly is located within the projection area of the groove in the thickness direction of the electrode assembly, that is, the orthographic projection of the pole lug groove on the diaphragm is located within the orthographic projection area of the groove on the diaphragm, so as to reduce the content of the first active material layer opposite to the pole lug groove, thereby reducing the deintercalation of lithium ions in the groove area, and further reducing the lithium plating in the pole lug groove area, thereby improving the safety of the battery.
- FIG. 1 is a schematic diagram of the structure of an electrode assembly provided in one embodiment of the present application.
- FIG. 2 is a schematic diagram of the structure of an electrode assembly provided in another embodiment of the present application.
- FIG. 3 is a schematic diagram of the second glue layer structure of the electrode assembly provided in an embodiment of the present application.
- first, second, etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the structures used in this way can be interchanged where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first”, “second”, etc. are generally of one type, and the number of objects is not limited.
- the first object can be one or more.
- an embodiment of the present application provides an electrode assembly, as shown in FIGS. 1 to 3 , the electrode assembly includes a first electrode sheet 10 , a second electrode sheet 20 , and a diaphragm 30 , wherein the diaphragm 30 is disposed between the first electrode sheet 10 and the second electrode sheet 20 .
- the first pole piece 10 includes a first current collector 101 and a first active material layer 102 located on the first current collector 101 .
- a groove 103 is provided on a surface of the first active material layer 102 on one side corresponding to the second pole piece 20 .
- the second pole piece 20 includes a second current collector 201, a second active material layer 202 and a preset pole ear 203.
- the second active material layer 202 is provided with a pole ear groove 204 for accommodating the preset pole ear 203.
- the projection of the pole ear groove 204 in the thickness direction of the electrode assembly is located within the projection area of the groove 103 in the thickness direction of the electrode assembly.
- the first pole piece 10 and the second pole piece 20 are arranged relatively spaced apart by the diaphragm 30, and a pole lug groove 204 is opened on the second active material layer 202 of the second pole piece 20, so that the preset pole lug 203 is fixed on the second current collector 201, and a groove 103 is opened in the first active material layer 102 of the first pole piece 10 opposite to the pole lug groove 204, so that the projection of the pole lug groove 204 in the thickness direction of the electrode assembly is located within the projection area of the groove 103 in the thickness direction of the electrode assembly, that is, the orthographic projection of the pole lug groove 204 on the diaphragm 30 is located within the orthographic projection area of the groove 103 on the diaphragm 30, so as to reduce the content of the first active material layer 102 opposite to the pole lug groove 204, thereby reducing the deintercalation of lithium ions in the groove 103 area, and further reducing the lithium precipitation in the pole lug groove 204 area,
- the first pole piece 10 can be a positive pole piece
- the second pole piece 20 can be a negative pole piece
- the first current collector 101 can be a positive current collector
- the first active material layer 102 can be a positive active material layer
- the second current collector 201 can be a negative current collector
- the second active material layer 202 can be a negative active material layer
- the preset pole tab 203 can be a negative pole tab.
- the second active material layer 202 can be relatively arranged on the opposite side surfaces of the second current collector 201.
- the second active material layers 202 on both sides of the second current collector 201 can be respectively arranged opposite to the first electrode 10, that is, the second active material layers 202 on both sides of the second current collector 201 can be provided with pole lug grooves 204, and no negative electrode active material is coated in the pole lug groove 204 area, and the first active material layers 102 on both sides opposite to the pole lug grooves 204 can be provided with grooves 103.
- the thickness of the first active material layer 102 in the groove 103 is 0.
- the first active material layer 102 is coated on at least one side of the first current collector 101, and part of the positive electrode active material is removed by cleaning or the like on the first active material layer 102 facing the second electrode sheet 20 to form the groove 103.
- the groove 103 is arranged opposite to the tab groove 204. Since there is no positive electrode active material in the groove 103 area, the deintercalation of lithium ions is reduced, thereby reducing the lithium deposition in the tab groove 204 area and improving the safety of the battery.
- the thickness of the first active material layer 102 in the groove 103 is 0, that is, the active material in the groove 103 is completely cleaned, which is an ideal state. In the actual production process, some residual active material will inevitably exist in the groove 103.
- the electrode assembly further includes a first glue layer 104, which is disposed in the groove 103, and a projection of the first glue layer 104 in the thickness direction of the electrode assembly covers the tab groove 204.
- a first glue layer 104 may be provided in the groove 103, and the size of the first adhesive layer 104 may be slightly smaller than the groove 103.
- the width of the groove 103 may be greater than the width of the first adhesive layer 104 by 6 mm to 20 mm, and/or the length of the groove 103 may be greater than the length of the first adhesive layer 104 by 6 mm to 20 mm, so that the first adhesive layer 104 is provided in the groove 103; and the projection of the first adhesive layer 104 in the thickness direction of the electrode assembly covers the tab groove 204.
- the deintercalation of lithium ions in the groove 103 is reduced, thereby reducing the lithium plating in the tab groove 204 region, thereby improving the safety of the battery.
- the electrode assembly further includes a second adhesive layer 205 , the second adhesive layer 205 covers the preset electrode tab 203 , and at least a portion of the second adhesive layer 205 is embedded in the groove 103 .
- a second glue layer 205 can be provided in the area of the pole tab groove 204 to coat the preset pole tab 203 and/or the second current collector 201 not coated with the second active material layer 202, thereby reducing the short circuit in the area of the pole tab groove 204 and enhancing the safety of the battery.
- a groove 103 is provided on the first pole sheet 10 opposite to the pole tab groove 204, and the electrode assembly is compacted, and at least part of the second glue layer 205 can be embedded in the groove 103, thereby reducing the space occupied by the glue layer between the positive and negative pole sheets, and improving the energy density of the battery when the thickness of the electrode sheets is the same.
- the projection of the second adhesive layer 205 in the thickness direction of the electrode assembly covers the tab groove 204 .
- the orthographic projection of the tab groove 204 on the diaphragm 30 is located within the orthographic projection area of the second adhesive layer 205 on the diaphragm 30 .
- the projection of the first glue layer 104 in the thickness direction of the electrode assembly covers the second glue layer 205 .
- the width of the groove 103 is greater than the width of the first glue layer 104 and the width of the second glue layer 205 is greater than the width of the tab groove 204.
- the length of the groove 103 is greater than the length of the first glue layer 104 and the length of the second glue layer 205 is greater than the length of the tab groove 204.
- the length of the second adhesive layer 205 is smaller than the length of the tab slot 204 by a difference ranging from 0 mm to 2 mm; and/or the width of the second adhesive layer 205 is smaller than the width of the tab slot 204 by a difference ranging from 0 mm to 2 mm. 2 mm.
- the width of the tab groove 204 can be equal to the width of the second adhesive layer 205, and the length of the tab groove 204 can be equal to the length of the second adhesive layer 205.
- the difference between the length of the second adhesive layer 205 and the length of the tab groove 204 can be 0 mm, and the difference between the width of the second adhesive layer 205 and the width of the tab groove 204 can be 0 mm, thereby reducing the space occupied by the second adhesive layer 205 between the positive and negative electrode sheets, and improving the energy density of the battery when the thickness of the electrode sheets is the same.
- the width and length of the second adhesive layer 205 can be set to be slightly smaller than the width and length of the pole ear groove 204 by 0.5 mm to 2 mm, so that at least part of the second adhesive layer 205 can be embedded in the groove 103, thereby improving the energy density of the battery when the thickness of the electrode sheet is the same.
- the depth of the groove 103 is greater than the sum of the thickness of the first adhesive layer 104 and the thickness of the second adhesive layer 205 .
- the depth of the groove 103 may range from 0 microns to 100 microns. Preferably, the depth of the groove 103>thickness of the first glue layer 104+thickness of the second glue layer 205. Specifically, the depth of the groove 103 may be 5 microns to 25 microns greater than the sum of the thickness of the first glue layer 104 and the thickness of the second glue layer 205, so that all and/or part of the preset tabs 203 of the second glue layer 205 are embedded in the groove 103, reducing the space occupied by the glue layer between the positive and negative electrodes, and improving the energy density of the battery when the thickness of the electrode sheets is the same.
- first pole piece 10 can be arranged on both sides of the second pole piece 20.
- first active material layer 102 on both sides of the pole ear groove 204 can be provided with a groove 103, and the depth of the groove 103 can be greater than the thickness of 2 layers of the first adhesive layer 104 + the thickness of 2 layers of the second adhesive layer 205, which can also achieve the same technical effect and will not be repeated here.
- the second adhesive layer 205 includes an extension portion, which may be a portion of the second adhesive layer 205 abutting against the second active material layer 202 , and a plurality of through holes 2051 may be formed on the extension portion.
- the shape of the through hole 2051 includes at least one of a circle, an ellipse, a polygon and an irregular shape.
- the size of the through hole 2051 can be adjusted according to the lithium deposition situation to enhance the stability of the connection between the second glue layer 205 and the second active material layer 202.
- the through holes 2051 are located at the extension part, that is, the two sides and the bottom of the second glue layer 205 that abuts against the second active material layer 202, and the top of the second glue layer 205 can be in the direction where the preset pole ear 203 extends away from the second current collector 201. In this way, more negative electrode active materials can be exposed, and lithium ions can be embedded in the second active material layer 202 through the through holes 2051 after being deintercalated from the first pole sheet 10, thereby reducing the lithium deposition in the pole ear groove 204 area and improving the safety of the battery.
- An embodiment of the present application also provides a battery, comprising the above-mentioned electrode assembly.
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Abstract
提供一种电极组件及电池，所述电极组件包括第一极片、第二极片和隔膜，所述隔膜设置在所述第一极片和所述第二极片之间；所述第一极片包括第一集流体和位于所述第一集流体上的第一活性物质层，所述第一活性物质层对应所述第二极片的一侧表面设置有凹槽；所述第二极片包括第二集流体、第二活性物质层和预设极耳，所述第二活性物质层设置有容置所述预设极耳的极耳槽，所述极耳槽在所述电极组件的厚度方向上的投影位于所述凹槽在所述电极组件的厚度方向上的投影区域内。
Description
本申请涉及电池技术领域，尤其涉及一种电极组件及电池。
发明背景
随着电池技术的发展，对电池的能量密度和安全性提出了更高的要求。第二极片析锂是影响电池安全性的重要因素之一。在第二极片上通常设置有极耳槽位，以容置预设极耳，这导致在极耳槽位中没有负极活性物质。在充电时，锂离子从第一极片上脱嵌后容易在极耳槽位边缘沉积并形成锂枝晶，影响电池的安全性。
可见，传统技术中电池存在安全性较低的问题。
发明内容
本申请实施例提供一种电极组件及电池，以解决传统技术中电池安全性较低的问题。
本申请实施例提供了一种电极组件，包括第一极片、第二极片和隔膜，所述隔膜设置在所述第一极片和所述第二极片之间；
所述第一极片包括第一集流体和位于所述第一集流体上的第一活性物质层，所述第一活性物质层对应所述第二极片的一侧表面设置有凹槽；
所述第二极片包括第二集流体、第二活性物质层和预设极耳，所述第二活性物质层设置有容置所述预设极耳的极耳槽，所述极耳槽在所述电极组件的厚度方向上的投影位于所述凹槽在所述电极组件的厚度方向上的投影区域内。
可选地，该电极组件还包括第一胶层，所述第一胶层设置在所述凹槽中，所述第一胶层在所述电极组件的厚度方向上的投影覆盖所述极耳槽。
可选地，该电极组件还包括第二胶层，所述第二胶层覆盖所述预设极耳，所述第二胶层的至少部分嵌设在所述凹槽中。
可选地，所述第二胶层在所述电极组件的厚度方向上的投影覆盖所述极耳槽。
可选地，该电极组件还包括第一胶层，所述第一胶层在所述电极组件的厚度方向上的投影覆盖所述第二胶层。
可选地，所述第二胶层包括延伸部，所述延伸部为所述第二胶层的与所述第二活性物质层相抵接的部分，所述延伸部开设有多个通孔。
可选地，所述通孔的形状包括圆形、椭圆形、多边形和不规则图形中的至少一种。可选地，所述第二胶层的长度小于所述极耳槽的长度的差值范围为0毫米
至2毫米。
可选地，所述第二胶层的宽度小于所述极耳槽的宽度的差值范围为0毫米至2毫米。
可选地，所述第二胶层的长度小于所述极耳槽的长度的差值范围为0毫米至2毫米；以及所述第二胶层的宽度小于所述极耳槽的宽度的差值范围为0毫米至2毫米。
可选地，该电极组件还包括第一胶层，所述凹槽的深度大于所述第一胶层的厚度与所述第二胶层的厚度之和。
可选地，所述凹槽的宽度大于所述第一胶层的宽度6毫米至20毫米。
可选地，所述凹槽的长度大于所述第一胶层的长度6毫米至20毫米。
可选地，所述凹槽的宽度大于所述第一胶层的宽度6毫米至20毫米；以及所述凹槽的长度大于所述第一胶层的长度6毫米至20毫米。
本申请实施例还提供了一种电池，包括上述的电极组件。
本申请实施例中，第一极片与第二极片之间通过隔膜相对间隔设置，在第二极片的第二活性物质层上开设有极耳槽，使得预设极耳固定在第二集流体，并且在与所述极耳槽相对的第一极片的第一活性物质层开设有凹槽，使得极耳槽在电极组件的厚度方向上的投影位于凹槽在电极组件的厚度方向上的投影区域内，也即，极耳槽在隔膜上的正投影位于凹槽在隔膜上的正投影区域内，以减少与所述极耳槽相对的第一活性物质层的含量，从而减少了凹槽区域的锂离子的脱嵌，进而减少了极耳槽区域析锂的情况，提高了电池的安全性。
附图简要说明
为了更清楚地说明本申请实施例的技术方案，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申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一实施例提供的电极组件的结构示意图。
图2是本申请另一实施例提供的电极组件的结构示意图。
图3是本申请实施例提供的电极组件的第二胶层结构示意图。
实施本发明的方式
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作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。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的结构在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”等所区分的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。
本申请实施例提供了一种电极组件，如图1至图3所示，该电极组件包括第一极片10、第二极片20和隔膜30，隔膜30设置在第一极片10和第二极片20之间。
第一极片10包括第一集流体101和位于第一集流体101上的第一活性物质层102，第一活性物质层102对应第二极片20的一侧表面设置有凹槽103。
第二极片20包括第二集流体201、第二活性物质层202和预设极耳203，第二活性物质层202设置有容置预设极耳203的极耳槽204，极耳槽204在电极组件的厚度方向上的投影位于凹槽103在电极组件的厚度方向上的投影区域内。
本实施方式中，第一极片10与第二极片20之间通过隔膜30相对间隔设置，在第二极片20的第二活性物质层202上开设有极耳槽204，使得预设极耳203固定在第二集流体201，并且在与极耳槽204相对的第一极片10的第一活性物质层102开设有凹槽103，使得极耳槽204在电极组件的厚度方向上的投影位于凹槽103在电极组件的厚度方向上的投影区域内，也即，极耳槽204在隔膜30上的正投影位于凹槽103在隔膜30上的正投影区域内，以减少与极耳槽204相对的第一活性物质层102的含量，从而减少了凹槽103区域的锂离子的脱嵌，进而减少了极耳槽204区域析锂的情况，提高了电池的安全性。
其中，第一极片10可以是正极片，第二极片20可以是负极片，对应的，第一集流体101可以是正极集流体，第一活性物质层102可以是正极活性物质层，第二集流体201可以是负极集流体，第二活性物质层202可以是负极活性物质层，预设极耳203可以是负极耳。通过减少与极耳槽204相对位置的正极片上的正极活性物质，减少了锂离子的脱嵌，从而减少在极耳槽204位置由于负极活性物质较少而导致析锂的情况。
其中，第二活性物质层202可以是相对设置在第二集流体201相对的两侧表面，叠片或卷绕设置后，第二集流体201两侧的第二活性物质层202可以分别与第一极片10相对设置，即第二集流体201两侧的第二活性物质层202均可以设置有极耳槽204，在极耳槽204区域没有涂覆负极活性物质，与极耳槽204相对的两侧的第一活性物质层102均可以设置有凹槽103。
在一些可选地实施方式中，在凹槽103中第一活性物质层102的厚度为0，换言之，在第一集流体101的至少一侧面涂覆第一活性物质层102，并在朝向第二极片20的第一活性物质层102上通过清洗等方式去除部分正极活性物质，形成凹槽103，
且凹槽103与极耳槽204相对设置，由于凹槽103区域没有正极活性物质，减少了锂离子的脱嵌，从而减少了极耳槽204区域析锂的情况，提高了电池的安全性。
需要说明的是，在凹槽103中第一活性物质层102的厚度为0，即凹槽103中的活性物质全部清洗干净，这是一种较为理想的状态，在实际生产过程中，凹槽103中难免会存在一些残留的活性物质。
在另一些可选地实施方式中，该电极组件还包括第一胶层104，第一胶层104设置在凹槽103中，第一胶层104在电极组件的厚度方向上的投影覆盖极耳槽204。在去除涂覆在第一集流体101上的部分第一活性物质层102形成凹槽103的过程中，难免在凹槽103中存在正极活性物质残留。可以在凹槽103中设置第一胶层104，第一胶层104的尺寸略小于凹槽103，换言之，凹槽103的宽度可以大于第一胶层104的宽度6毫米至20毫米，和/或，凹槽103的长度可以大于第一胶层104的长度6毫米至20毫米，以便于第一胶层104设置在凹槽103中；并且，第一胶层104在电极组件的厚度方向上的投影覆盖极耳槽204，通过第一胶层104的阻挡作用，减少了凹槽103中锂离子的脱嵌，从而减少了极耳槽204区域析锂的情况，提高了电池的安全性。
可选地，该电极组件还包括第二胶层205，第二胶层205覆盖预设极耳203，第二胶层205的至少部分嵌设在凹槽103中。
本实施方式中，可以在极耳槽204区域设置第二胶层205，以对预设极耳203和/或没有涂覆第二活性物质层202的第二集流体201进行包覆，减少极耳槽204区域短路的情况，增强电池的安全性。并且，与极耳槽204相对的第一极片10上开设有凹槽103，电极组件进行压实，第二胶层205的至少部分可以嵌设在凹槽103中，减少了胶层在正负极片之间的空间占用，在电极片厚度相同的情况下，提高了电池的能量密度。
可选地，第二胶层205在电极组件的厚度方向上的投影覆盖极耳槽204，换言之，极耳槽204在隔膜30上的正投影位于第二胶层205在隔膜30上的正投影区域内。
其中，第一胶层104在电极组件的厚度方向上的投影覆盖第二胶层205。
本实施方式中，凹槽103宽度>第一胶层104宽度>第二胶层205宽度>极耳槽204宽度，凹槽103长度>第一胶层104长度>第二胶层205长度>极耳槽204长度，通过第二胶层205对极耳槽204中预设极耳203的包覆作用，减少了预设极耳203短路的情况，并且预设极耳203所在位置的第一活性物质层102的含量少于第二活性物质层202的含量，以减少凹槽103区域的锂离子的脱嵌，同时，通过第一胶层104设置在凹槽103中，从而进一步减少了极耳槽204区域析锂的情况，提高了电池的安全性。
可选地，第二胶层205的长度小于极耳槽204的长度的差值范围可以是0毫米至2毫米；和/或第二胶层205的宽度小于极耳槽204的宽度的差值范围可以是0毫米至
2毫米。
在一示例中，极耳槽204的宽度可以等于第二胶层205的宽度，极耳槽204的长度可以等于第二胶层205的长度，换言之，第二胶层205的长度与极耳槽204的长度的差值可以是0毫米，第二胶层205的宽度与极耳槽204的宽度的差值可以是0毫米，减少了第二胶层205在正负极片之间的空间占用，在电极片厚度相同的情况下，提高电池的能量密度。
当然，在实际生产过程中，第二胶层205宽度和长度可以设置为与极耳槽204宽度和长度略小0.5毫米至2毫米，以便于第二胶层205的至少部分可以嵌设在凹槽103中，在电极片厚度相同的情况下，提高电池的能量密度。
可选地，凹槽103的深度大于第一胶层104的厚度与第二胶层205的厚度之和。
在一些可选地实施方式中，凹槽103的深度范围可以是0微米至100微米。优选地，凹槽103深度>第一胶层104厚度+第二胶层205厚度。具体的，凹槽103的深度可以比第一胶层104厚度与第二胶层205厚度之和大5微米至25微米，以将第二胶层205的全部和/或部分预设极耳203嵌设在凹槽103中，减少了胶层在正负极片之间的空间占用，在电极片厚度相同的情况下，提高电池的能量密度。
需要说明的是，第二极片20两侧均可以设置有第一极片10，换言之，极耳槽204两侧的第一活性物质层102均可以开设有凹槽103，凹槽103深度可以>2层第一胶层104的厚度+2层第二胶层205的厚度，同样可以达到相同的技术效果，在此不再赘述。
可选地，第二胶层205包括延伸部，延伸部可以是第二胶层205的与第二活性物质层202相抵接的部分，延伸部上可以开设有多个通孔2051。
本实施方式中，通孔2051的形状包括圆形、椭圆形、多边形和不规则图形中的至少一种，可以根据析锂的情况调整通孔2051的大小，增强第二胶层205与第二活性物质层202连接的稳定性。
通孔2051位于延伸部，即第二胶层205的与第二活性物质层202相抵接部分的两侧和底部，第二胶层205的顶部可以在预设极耳203远离第二集流体201延伸的方向。这样，可以使得更多负极活性物质暴露出来，锂离子从第一极片10上脱嵌后，可以通过通孔2051嵌设在第二活性物质层202上，减少了极耳槽204区域析锂的情况，提高了电池的安全性。
本申请实施例还提供了一种电池，包括上述的电极组件。
需要说明的是，上述电极组件的实施例的实现方式同样适应于该电池的实施例中，并能达到相同的技术效果，在此不再赘述。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过
程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外，需要指出的是，本申请实施方式中的方法和装置的范围不限于按所讨论的顺序来执行功能，还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能，例如，可以按不同于所描述的次序来执行所描述的方法，并且还可以添加、省去、或组合各种步骤。另外，参照某些示例所描述的特征可在其他示例中被组合。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。
Claims (15)
- 一种电极组件，其特征在于，包括第一极片、第二极片和隔膜，所述隔膜设置在所述第一极片和所述第二极片之间；所述第一极片包括第一集流体和位于所述第一集流体上的第一活性物质层，所述第一活性物质层对应所述第二极片的一侧表面设置有凹槽；所述第二极片包括第二集流体、第二活性物质层和预设极耳，所述第二活性物质层设置有容置所述预设极耳的极耳槽，所述极耳槽在所述电极组件的厚度方向上的投影位于所述凹槽在所述电极组件的厚度方向上的投影区域内。
- 根据权利要求1所述的电极组件，其特征在于，还包括第一胶层，所述第一胶层设置在所述凹槽中，所述第一胶层在所述电极组件的厚度方向上的投影覆盖所述极耳槽。
- 根据权利要求1或2所述的电极组件，其特征在于，还包括第二胶层，所述第二胶层覆盖所述预设极耳，所述第二胶层的至少部分嵌设在所述凹槽中。
- 根据权利要求3所述的电极组件，其特征在于，所述第二胶层在所述电极组件的厚度方向上的投影覆盖所述极耳槽。
- 根据权利要求4所述的电极组件，其特征在于，还包括第一胶层，所述第一胶层在所述电极组件的厚度方向上的投影覆盖所述第二胶层。
- 根据权利要求4所述的电极组件，其特征在于，所述第二胶层包括延伸部，所述延伸部为所述第二胶层的与所述第二活性物质层相抵接的部分，所述延伸部开设有多个通孔。
- 根据权利要求6所述的电极组件，其特征在于，所述通孔的形状包括圆形、椭圆形、多边形和不规则图形中的至少一种。
- 根据权利要求3至7中任一项所述的电极组件，其特征在于，所述第二胶层的长度小于所述极耳槽的长度的差值范围为0毫米至2毫米。
- 根据权利要求3至7中任一项所述的电极组件，其特征在于，所述第二胶层的宽度小于所述极耳槽的宽度的差值范围为0毫米至2毫米。
- 根据权利要求3至7中任一项所述的电极组件，其特征在于，所述第二胶层的长度小于所述极耳槽的长度的差值范围为0毫米至2毫米；以及所述第二胶层的宽度小于所述极耳槽的宽度的差值范围为0毫米至2毫米。
- 根据权利要求3至10中任一项所述的电极组件，其特征在于，还包括第一胶层，所述凹槽的深度大于所述第一胶层的厚度与所述第二胶层的厚度之和。
- 根据权利要求2至11中任一项所述的电极组件，其特征在于，所述凹槽的宽度大于所述第一胶层的宽度6毫米至20毫米。
- 根据权利要求2至11中任一项所述的电极组件，其特征在于，所述凹槽的长度大于所述第一胶层的长度6毫米至20毫米。
- 根据权利要求2至11中任一项所述的电极组件，其特征在于，所述凹槽的宽度大于所述第一胶层的宽度6毫米至20毫米；以及所述凹槽的长度大于所述第一胶层的长度6毫米至20毫米。
- 一种电池，其特征在于，包括如权利要求1至14中任一项所述的电极组件。
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