WO2024074096A1 - 极片及电池 - Google Patents

极片及电池 Download PDF

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Publication number
WO2024074096A1
WO2024074096A1 PCT/CN2023/120665 CN2023120665W WO2024074096A1 WO 2024074096 A1 WO2024074096 A1 WO 2024074096A1 CN 2023120665 W CN2023120665 W CN 2023120665W WO 2024074096 A1 WO2024074096 A1 WO 2024074096A1
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WO
WIPO (PCT)
Prior art keywords
current collector
groove
width
die
pole piece
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Application number
PCT/CN2023/120665
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English (en)
French (fr)
Inventor
刘惠霞
孙新阳
胡大林
廖兴群
Original Assignee
惠州市豪鹏科技有限公司
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Application filed by 惠州市豪鹏科技有限公司 filed Critical 惠州市豪鹏科技有限公司
Publication of WO2024074096A1 publication Critical patent/WO2024074096A1/zh

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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 a pole piece and a battery.
  • lithium-ion batteries in related technologies usually weld the tabs directly to the empty foil area of the pole piece, making the tab welding area the location with the largest battery thickness, resulting in the battery capacity cannot be further increased.
  • some technologies use laser cleaning equipment to open grooves on the pole piece, and then die-cut the pole piece and weld the tabs into the grooves, thereby reducing the thickness of the battery and increasing the battery's energy density.
  • too much active material is cut from the pole piece, resulting in no significant increase in the battery capacity.
  • the technical problem to be solved by the present application is: for lithium-ion batteries in the related art, grooves are opened on the pole pieces by laser cleaning equipment, and too much active material is cut off from the pole pieces, resulting in the problem that the capacity of the battery is not significantly increased.
  • a pole piece and a battery are provided.
  • an embodiment of the present application provides a pole piece, including:
  • An active material layer wherein the active material layer is formed by uniformly coating active material on both sides of the current collector;
  • a die-cut region is formed by cutting the current collector and the corresponding active material layer in a predetermined region, wherein one side edge of the die-cut region overlaps with one side edge of the current collector in a width direction;
  • a groove is formed by removing the active material layer on a portion of the surface of the current collector, wherein the groove has a first opening and a second opening, wherein the opening direction of the first opening is parallel to the thickness direction of the active material layer, and the second opening is connected to the die-cut area;
  • the distance between the two opposite side walls of the die-cutting area in the length direction of the current collector is smaller than the distance between the two opposite side walls of the die-cutting area in the length direction of the current collector.
  • the distance between the two opposite side walls in the length direction of the current collector is such that protrusions are formed on both sides of the second opening parallel to the length direction of the current collector;
  • a pole ear one end of which is located in the groove and welded to the current collector, and the other end of which extends out of the die-cutting area from the second opening;
  • the width of the pole ear is 0.4-0.8 times the width of the groove, and the width of the pole ear is 4-9.6 mm.
  • the cross-sectional shape of the die-cut area is a rectangle
  • the cross-sectional shape of the protrusion is a rectangle
  • two opposite side walls of the die-cut area in the opposite direction of the length of the current collector overlap with two opposite side walls of the protrusions respectively.
  • the protrusion is semicircular, the facing sides of the protrusions on both sides of the groove are arc-shaped, and the straight line portion of the protrusion is located inside the protrusion.
  • the cross-sectional shape of the die-cutting area is formed by a rectangle and an arc line, and the two ends of the arc line are connected to the two ends of one side edge of the rectangle, so that the arc line protrudes away from the center of the rectangle, one side edge of the rectangle coincides with a side edge of the width of the collector, and the arc line protrudes toward the groove.
  • the cross-sectional shape of the groove is rectangular, and the length direction of the groove is perpendicular to the length direction of the current collector.
  • the width of the groove is 10 to 12 mm.
  • the width of the die-cutting area is 1.1-1.6 times the width of the tab.
  • the width of the protrusion is 0-0.6 times the width of the groove, and the length of the protrusion is 0-0.8 times the length of the groove; the length of the protrusion is 0-9.6 mm.
  • the overlapping area between the pole lug and the groove is a welding area, and the width of the welding area is 0.2-0.8 times the width of the pole lug.
  • the length of the welding area is 0.1-0.4 times the length of the pole lug.
  • the two grooves are arranged at opposite positions on both side surfaces of the current collector.
  • a groove is formed by removing part of the active layer to expose the current collector, so that the pole ear is welded in the groove to reduce the increase in thickness caused by directly welding the pole ear to the empty foil area; on this basis, protrusions are provided on both sides of the opening of the groove, and the protrusions and the active layer are made of the same material to increase the active material area on the surface of the current collector and improve the battery capacity.
  • the width of the pole ear is 0.4-0.8 times the width of the groove, and the width of the pole ear is 4-9.6mm.
  • the battery capacity can be further increased.
  • an embodiment of the present application provides a battery, comprising the above-mentioned electrode sheet.
  • FIG. 1 is an overall schematic diagram of a pole piece provided in the first embodiment of the present application.
  • a pole piece provided in the first embodiment of the present application includes a current collector 1, an active material layer 2 and a pole ear 5.
  • the active material is uniformly coated on both sides of the current collector 1 to form an active material layer 2.
  • the active material layer 2 on part of the surface of the current collector 1 is removed by laser to form a groove 3, so that the groove 3 has a first opening, and the opening direction of the first opening is parallel to the thickness direction of the active material layer 2; in other words, the direction of the first opening is perpendicular to the current collector 1.
  • the current collector 1 and the corresponding active material layer 2 in the predetermined area are then die-cut by a die-cutting machine to form a die-cutting area 6, and one side edge of the die-cutting area 6 coincides with one side edge of the width of the current collector 1.
  • the groove 3 has a second opening, and the second opening connects the die-cutting area 6, so that the connected die-cutting area 6 and the groove 3 form a T-shaped groove.
  • the distance between the opposite side walls of the die-cutting area 6 in the length direction of the current collector 1 is less than the distance between the opposite side walls of the groove 3 in the length direction of the current collector 1, and the second opening forms a bulge on both sides of the length direction of the current collector 1.
  • One end of the tab 5 is welded to the exposed current collector 1 in the groove 3, and the other end passes through the die-cut area 6 from the second opening.
  • the die-cut area 6 and the groove 3 form a T-slot
  • the small end of the T-slot (die-cut area 6) is located on the edge of the current collector 1 in the width direction
  • the large end of the T-slot (groove 3) is located in the middle of the current collector 1.
  • the active material layer 2 is removed in the groove 3 to reduce the thickness of the electrode, and the protrusions formed on both sides of the die-cut area 6 are used to reserve part of the active material layer 2 as much as possible to increase the content of the active material, while meeting the needs of thinning the thickness and a larger retention amount of active material, thereby taking a two-pronged approach to increase the battery capacity.
  • the cross-sectional shape of the die-cutting area 6 is formed by a rectangle and an arc, the two ends of the arc are connected to the two ends of one side line of the rectangle, and the arc protrudes away from the center of the rectangle, one side line of the rectangle coincides with one side edge of the width of the current collector 1, and the arc protrudes toward the groove 3.
  • the cross-sectional shape of the die-cutting area 6 is roughly D-shaped, the arc portion of the die-cutting area 6 faces the groove 3, the straight portion of the die-cutting area 6 coincides with one side edge of the width of the current collector 1, and the other two sides of the die-cutting area 6 coincide with the facing edges of the two protrusions 4.
  • the cross-sectional shape of the groove 3 is rectangular, the length direction of the groove 3 is perpendicular to the length direction of the current collector 1, and the width of the groove 3 is 10-12 mm.
  • the width of the pole ear 5 is 0.4-0.8 times the width of the groove 3, and the width of the pole ear 5 is 4-9.6 mm.
  • the width of the die-cutting area 6 is 1.1-1.6 times the width of the pole ear 5.
  • the width of the protrusion 4 is 0-0.6 times the width of the groove 3 (excluding 0 times), and the length of the protrusion 4 is 0-0.8 times the length of the groove 3 (excluding The length of the protrusion 4 is 0-9.6 mm (excluding 0).
  • the slot width is defined as A, and the parameter of A is 10-12 mm; the width of the pole ear 5 is defined as B, and the parameter of B is 4-9.6 mm; the length of the protrusion 4 is defined as C, and the parameter of C is 0-9.6 mm (excluding 0).
  • the total area of the protrusion 4 in the two grooves 3 is 0-115 mm 2 (excluding 0).
  • the energy value per unit area is 1-5 cm 2 /mAh, so the battery capacity that can be increased by the optimized pole piece is 0-5.75 mAh (excluding 0).
  • the overlapping area of the pole lug 5 and the groove 3 is the welding area, and the width of the welding area is 0.2-0.8 times the width of the pole lug 5; the length of the welding area is 0.1-0.4 times the length of the pole lug 5, and the area of the welding area is used to further ensure the stable welding of the pole lug 5 and the groove 3.
  • the pole piece of the second embodiment of the present application is different from that of the first embodiment in that the cross-sectional shape of the die-cut area is rectangular, the cross-sectional shape of the protrusion is rectangular, and the edges on both sides of the die-cut area overlap with the edges of the opposite sides of the two protrusions respectively.
  • the pole piece of the third embodiment of the present application is different from that of the first embodiment in that, in the present embodiment, the protrusion may also be other regular geometric shapes, for example, the protrusion may be semicircular, the protrusions on both sides of the groove facing each other are arc-shaped, and the straight portion of the protrusion is located inside the protrusion.
  • This shape of the protrusion can also increase the battery capacity as much as possible while reducing the battery thickness, and the smooth round edge is less likely to produce burrs.

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

Abstract

一种电池，具有极片，该极片包括集流体（1）、活性物质层（2）和极耳（5）；集流体的两侧表面均匀涂覆活性物质形成活性物质层；切除预定区域内的集流体和对应的活性物质层以形成模切区域（6），模切区域的一侧边沿重合于集流体的宽度方向的一侧边沿；切除预定区域内的集流体和活性物质层形成凹槽（3），凹槽具有第一开口和第二开口，第一开口的朝向平行活性物质层的厚度方向，第二开口连通模切区域，第二开口的平行于集流体的长度方向的两侧形成凸起（4），极耳的宽度为凹槽宽度的0.4-0.8倍，极耳的宽度为4～9.6mm。

Description

极片及电池
本申请要求于2022年10月08日提交、申请号为202222641238.5，发明名称为“极 片及电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，尤其涉及一种极片及电池。
背景技术
目前，相关技术中的锂离子电池，通常将极耳直接焊接到极片的空箔区，使得极耳焊接区变成了电池厚度最大的位置，导致电池的容量不能进一步提升。基于此，又有部分技术通过激光清洗设备在极片上开设凹槽，随后进行极片模切，将极耳焊接到凹槽内，从而降低了电池的厚度，提高了电池的能量密度，然而极片裁去的活性物质过多，致使电池的容量并未明显增加。
发明内容
本申请所要解决的技术问题是：针对相关技术中的锂离子电池，通过激光清洗设备在极片上开设凹槽，极片裁去的活性物质过多，致使电池的容量并未明显增加的问题，提供一种极片及电池。
为解决上述技术问题，一方面，本申请实施例提供一种极片，包括：
集流体；
活性物质层，所述活性物质层由所述集流体的两侧表面均匀涂覆活性物质形成；
通过切除预定区域内的所述集流体和对应的所述活性物质层以形成模切区域，所述模切区域的一侧边沿重合于所述集流体的宽度方向的一侧边沿；
通过去除所述集流体的部分表面的活性物质层以形成凹槽，所述凹槽具有第一开口和第二开口，所述第一开口的开口方向平行于所述活性物质层的厚度方向，所述第二开口连通所述模切区域；
所述模切区域在所述集流体的长度方向的相对的两侧壁的距离小于所述凹槽在所 述集流体的长度方向的相对的两侧壁的距离，所述第二开口的平行于所述集流体的长度方向的两侧形成凸起；
极耳，所述极耳的一端位于所述凹槽内并焊接于所述集流体，另一端从所述第二开口伸出所述模切区域；
所述极耳的宽度为所述凹槽宽度的0.4-0.8倍，所述极耳的宽度为4～9.6mm。
可选地，所述模切区域的截面形状为矩形，所述凸起的截面形状为矩形，所述模切区域在所述集流体的长度反向的相对的两侧壁分别重合于两个所述凸起的相向的侧壁。
可选地，所述凸起为半圆形，所述凹槽两侧的凸起相向侧为弧形，所述凸起的直线部位于所述凸起内。
可选地，所述模切区域的截面形状由矩形和弧线围设而成，所述弧线的两端连接于所述矩形的其中一侧边的两端，使得所述弧线朝向远离所述矩形的中心凸出，所述矩形的一侧边重合于所述集流体的宽度的一侧边沿，所述弧线朝向所述凹槽凸出。
可选地，所述凹槽的截面形状为矩形，所述凹槽的长度方向垂直于所述集流体的长度方向。
可选地，所述凹槽的宽度为10～12mm
可选地，所述模切区域的宽度为所述极耳的宽度的1.1-1.6倍。
可选地，所述凸起的宽度为所述凹槽的宽度的0-0.6倍，且该所述凸起的长度为所述凹槽长度的0-0.8倍；所述凸起的长度为0-9.6mm。
可选地，所述极耳和所述凹槽重合区域为焊接区域，所述焊接区域的宽度为所述极耳的宽度为0.2-0.8倍。
可选地，所述焊接区域的长度为所述极耳的长度为0.1-0.4倍。
可选地，所述凹槽为两个，两个所述凹槽设置于所述集流体的两侧表面的相对位置。
根据本申请实施例的极片，通过清除部分活性层使得集流体裸露而出形成凹槽，从而将极耳焊接在凹槽内，以减少极耳直接焊接在空箔区所造成的厚度增加；在此基础上，并且在凹槽的开口两侧设置凸起，凸起和活性层同一材质，以增加集流体表面的活性物质面积，提高电池容量。
极耳的宽度为凹槽的宽度的0.4-0.8倍，极耳的宽度为4～9.6mm，经此优化后的极 片可以进一步提高电池容量。
另一方面，本申请实施例提供一种电池，包括上述的极片。
附图说明
图1是本申请第一实施例提供的极片的整体示意图。
说明书中的附图标记如下：
1、集流体；2、活性物质层；3、凹槽；4、凸起；5、极耳；6、模切区域。
具体实施方式
为了使本申请所解决的技术问题、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
第一实施例
如图1所示，本申请第一实施例提供的一种极片，包括集流体1、活性物质层2和极耳5。集流体1的两侧表面均匀涂覆活性物质以形成活性物质层2。集流体1经激光清除其部分表面上活性物质层2以形成凹槽3，使得凹槽3具有第一开口，第一开口的开口方向平行于活性物质层2的厚度方向；换言之，第一开口的朝向垂直于集流体1。再利用模切机模切预定区域内的集流体1和对应的活性物质层2以形成模切区域6，模切区域6的一侧边沿重合于集流体1的宽度的一侧边沿。此时，凹槽3具有第二开口，第二开口连通模切区域6，使得连通的模切区域6和凹槽3形成T型槽。并且模切区域6在集流体1的长度方向的相对的两侧壁之间的距离小于凹槽3在集流体1的长度方向的相对两侧壁之间的距离，第二开口的在集流体1长度方向的两侧形成凸起。极耳5的一端焊接于凹槽3内裸漏的集流体1上，另一端从第二开口穿出模切区域6。此时模切区域6和凹槽3形成的T型槽，T型槽的小端(模切区域6)位于集流体1的宽度方向的边沿上，T型槽的大端(凹槽3)位于集流体1中部。
这样，既在凹槽3内去除活性物质层2以缩小极片的厚度，还在模切区域6的两侧利用形成的凸起以尽可能地预留部分活性物质层2以提高活性物质的含量，同时满足厚度变薄和活性物质较大的存留量的需求，进而双管齐下以提高电池容量。
在本实施例中，凹槽3为两个，两个凹槽3分别设置于集流体1的两侧表面的相对位置，使得两个凹槽3在集流体1的投影重合。
在本实施例中，模切区域6的截面形状由矩形和弧线围设而成，模切区域6的截面形状由矩形和弧线围设而成，弧线的两端部连接于矩形的其中一侧边线的两端，并且弧线朝向远离矩形的中心凸出，矩形的一侧边线重合于集流体1的宽度的一侧边沿，弧线朝向凹槽3凸出。换言之，模切区域6的截面形状大致呈D型，模切区域6的弧形部分朝向凹槽3，模切区域6的直线部分重合于集流体1的宽度的一侧边沿，模切区域6的另外两侧与两个凸起4的相向边沿重合。
在本实施例中，凹槽3的截面形状为矩形，凹槽3的长度方向垂直于集流体1的长度方向，凹槽3的宽度为10～12mm。极耳5的宽度为凹槽3宽度的0.4-0.8倍，极耳5的宽度为4～9.6mm。模切区域6的宽度为极耳5的宽度的1.1-1.6倍。凸起4的宽度为凹槽3的宽度的0-0.6倍(不包含0倍)，且该凸起4的长度为凹槽3长度的0-0.8倍(不 包含0倍)。凸起4的长度为0-9.6mm(不包含0)。通过上述将极耳5、凹槽3和模切区域6之间的位置关系确定，以将极耳5稳定地焊接于凹槽3内，减少虚焊现象地发生。
另外因为凸起4的面积可以通过上述数据确定，因此可以算出电池的容量。具体地，槽位宽度定义为A，A的参数是10～12mm；极耳5宽度定义为B，B的参数是4～9.6mm；凸起4长度定义为C，C的参数是0～9.6mm(不包含0)。再加上凹槽3为两个，则两个凹槽3内的凸起4的总面积为0～115mm2(不包含0)。而单位面积能量值为1～5cm2/mAh，因此经优化后的极片可以增加的电池容量为0～5.75mAh(不包含0)。
同时，在本实施例中，极耳5和凹槽3重合区域为焊接区域，焊接区域的宽度为极耳5的宽度为0.2-0.8倍；焊接区域的长度为极耳5的长度为0.1-0.4倍，焊接区域的面积用于进一步地确保极耳5和凹槽3的稳定焊接。
第二实施例
本申请第二实施例的极片，其与第一实施例的不同之处在于，模切区域的截面形状为矩形，凸起的截面形状为矩形，模切区域的两侧的边沿分别重合于两个凸起的相向侧的边沿。
第三实施例
本申请第三实施例的极片，其与第一实施例的不同之处在于，在本实施例中，凸起也可以为其他规则的几何形状，例如，凸起的可以为半圆形，凹槽两侧的凸起相向侧为弧形，凸起的直线部位于凸起内，此种凸起的形状也能在减少电池厚度的基础上，尽可能地增加电池容量，并且顺滑的圆形边沿，更不容易产生毛刺。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种极片，其特征在于，包括：
    集流体(1)；
    活性物质层(2)，所述活性物质层(2)由所述集流体(1)的两侧表面均匀涂覆活性物质形成；
    通过切除预定区域内的所述集流体(1)和对应的所述活性物质层(2)以形成模切区域(6)，所述模切区域(6)的一侧边沿重合于所述集流体(1)的宽度方向的一侧边沿；
    通过去除所述集流体(1)的部分表面的活性物质层(2)以形成凹槽(3)，所述凹槽(3)具有第一开口和第二开口，所述第一开口的开口方向平行于所述活性物质层(2)的厚度方向，所述第二开口连通所述模切区域(6)；所述模切区域(6)在所述集流体(1)的长度方向的相对的两侧壁的距离小于所述凹槽(3)在所述集流体(1)的长度方向的相对的两侧壁的距离，所述第二开口的平行于所述集流体(1)的长度方向的两侧形成凸起(4)；
    极耳(5)，所述极耳(5)的一端位于所述凹槽(3)内并焊接于所述集流体(1)，另一端从所述第二开口伸出所述模切区域(6)；
    所述极耳(5)的宽度为所述凹槽(3)的宽度的0.4-0.8倍，所述极耳(5)的宽度为4～9.6mm。
  2. 根据权利要求1所述的极片，其特征在于，所述模切区域(6)的截面形状为矩形，所述凸起(4)的截面形状为矩形，所述模切区域(6)在所述集流体(1)的长度反向的相对的两侧壁分别重合于两个所述凸起(4)的相向的侧壁。
  3. 根据权利要求1所述的极片，其特征在于，所述凸起为半圆形，所述凹槽两侧的凸起相向侧为弧形，所述凸起的直线部位于所述凸起内。
  4. 根据权利要求1所述的极片，其特征在于，所述模切区域(6)的截面形状由矩形和弧线围设而成，所述弧线的两端连接于所述矩形的其中一侧边的两端，使得所述弧线朝向远离所述矩形的中心凸出，所述矩形的一侧边重合于所述集流体(1)的宽度的一侧边沿，所述弧线朝向所述凹槽(3)凸出。
  5. 根据权利要求1所述的极片，其特征在于，所述凹槽(3)的截面形状为矩形，所述凹槽(3)的长度方向垂直于所述集流体(1)的长度方向。
  6. 根据权利要求5所述的极片，其特征在于，所述凹槽(3)的宽度为10～12mm。
  7. 根据权利要求1所述的极片，其特征在于，所述模切区域(6)的宽度为所述极耳(5)的宽度的1.1-1.6倍。
  8. 根据权利要求7所述的极片，其特征在于，所述凸起(4)的宽度为所述凹槽(3)的宽度的0-0.6倍，且该所述凸起(4)的长度为所述凹槽(3)长度的0-0.8倍；所述凸起(4)的长度为0-9.6mm。
  9. 根据权利要求5所述的极片，其特征在于，所述极耳(5)和所述凹槽(3)重合区域为焊接区域，所述焊接区域的宽度为所述极耳(5)的宽度为0.2-0.8倍。
  10. 根据权利要求9所述的极片，其特征在于，所述焊接区域的长度为所述极耳(5)的长度为0.1-0.4倍。
  11. 根据权利要求1所述的极片，其特征在于，所述凹槽(3)为两个，两个所述凹槽(3)设置于所述集流体(1)的两侧表面的相对位置。
  12. 一种电池，其特征在于，包括上述权利要求1-11中任一所述的极片。
PCT/CN2023/120665 2022-10-08 2023-09-22 极片及电池 WO2024074096A1 (zh)

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