WO2024120551A1 - 极片及电芯 - Google Patents
极片及电芯 Download PDFInfo
- Publication number
- WO2024120551A1 WO2024120551A1 PCT/CN2024/075669 CN2024075669W WO2024120551A1 WO 2024120551 A1 WO2024120551 A1 WO 2024120551A1 CN 2024075669 W CN2024075669 W CN 2024075669W WO 2024120551 A1 WO2024120551 A1 WO 2024120551A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- pole
- electrode sheet
- pole piece
- current collector
- Prior art date
Links
- 239000011149 active material Substances 0.000 claims description 27
- 239000003292 glue Substances 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 18
- 210000005069 ears Anatomy 0.000 claims description 13
- 230000004308 accommodation Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 239000013543 active substance Substances 0.000 abstract 4
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 8
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 8
- 238000003466 welding Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 101100233916 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) KAR5 gene Proteins 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 102100023591 Polyphosphoinositide phosphatase Human genes 0.000 description 1
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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 technical field of battery cells, for example, to a pole piece and a battery cell.
- the electrode production technology commonly used is to weld a single pole ear to one side of the current collector.
- the battery cell is formed by winding two pole pieces with opposite polarities and a diaphragm.
- the relevant technology has the following technical defects: the internal resistance of the battery cell in the form of a single pole ear is very large, and the heat generated during fast charging is high, which affects the service life and safety performance of the battery cell.
- the present application provides a pole piece with a simple structure and good safety performance.
- the present application provides a battery cell with a simple structure and a relatively thin thickness.
- an embodiment of the present application provides a pole piece, comprising a current collector and an active material layer, wherein the active material layer is arranged on two opposite side surfaces of the current collector, a first groove is opened on the active material layer on one side, and a second groove is opened on the active material layer on the other side, the bottoms of the first groove and the second groove both penetrate into the current collector, a pole ear is inserted in the first groove and the second groove respectively, the two pole ears are connected to the current collector, and the two pole ears are connected to each other.
- the two tabs are connected via a current collecting sheet.
- the pole ear includes a metal sheet and an insulating glue arranged on the periphery of the metal sheet, the two metal sheets are respectively inserted into the first groove and the second groove, and the two metal sheets are connected through the current collecting sheet, and the two insulating glues are arranged side by side along a first direction, and the first direction is the length direction of the pole sheet when it is unfolded.
- first groove and the second groove are arranged opposite to each other, and the size of the first groove and the second groove along the first direction is greater than or equal to twice the size of the insulating glue along the first direction; or,
- the projections of the first groove and the second groove on the current collector are arranged side by side along the first direction, and the sizes of the first groove and the second groove along the first direction are greater than the size of the insulating glue along the first direction.
- the dimensions of the pole piece satisfy at least one of the following: the thickness of the active material layer ranges from 0.05 to 0.2 mm; the thickness of the pole tab ranges from 0.1 to 0.7 mm; and the thickness of the insulating glue ranges from 0.05 to 0.3 mm.
- the first groove and the second groove at least penetrate one end of the active material layer along the width direction of the pole piece.
- the first groove and the second groove are located at non-end positions in the unfolded length direction of the pole piece.
- an embodiment of the present application provides a battery cell, which is formed by winding a separator and a positive electrode sheet and a negative electrode sheet located on both sides of the separator, and the positive electrode sheet and the negative electrode sheet are the above-mentioned electrode sheets.
- one of the positive electrode sheet and the negative electrode sheet is provided with a first groove of the electrode sheet and a second groove of the electrode sheet
- the other of the positive electrode sheet and the negative electrode sheet is provided with a first avoidance groove and a second avoidance groove respectively relative to the first groove position and the second groove position
- an accommodating space for accommodating the pole ear of the electrode sheet is formed between the first avoidance groove and the first groove, and between the second avoidance groove and the second groove, which are opposite to each other after the battery cell is wound.
- the thickness of the tab is less than or equal to the dimension of the accommodation space along the second direction.
- the beneficial effects of the present application are as follows: by opening a groove respectively on the active material layer on two opposite sides of the current collector, a pole ear is welded in each of the two grooves, the two pole ears are connected to the current collector and the two pole ears are connected to each other, so as to form a pole piece with a bipolar ear structure in which pole ears are welded on both sides of the current collector.
- the pole piece with a bipolar ear structure is conducive to the conduction of current, thereby effectively reducing the internal resistance of the battery cell, reducing the heat generated during fast charging of the battery cell, and effectively improving the service life and safety performance of the battery cell.
- FIG1 is a schematic diagram of the structure of a pole piece according to an embodiment of the present application.
- FIG2 is a schematic diagram of the coordination between the current collector and the active material layer in an embodiment of the present application
- FIG3 is a schematic diagram of the structure of a battery cell according to an embodiment of the present application.
- FIG4 is a schematic diagram of the coordination of the positive electrode sheet, the negative electrode sheet and the separator according to an embodiment of the present application
- connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
- connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
- a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them.
- a first feature being “above”, “above” and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
- a first feature being “below”, “below” and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
- the pole piece of the embodiment of the present application includes a current collector 1 and an active material layer 2, the active material layer 2 is arranged on two opposite sides of the current collector 1, a first groove 21 is provided on the active material layer 2 on one side, and a second groove 22 is provided on the active material layer 2 on the other side, the groove bottoms of the first groove 21 and the second groove 22 are both penetrated to the current collector 1, and a pole ear 3 is inserted in the first groove 21 and the second groove 22 respectively, and the pole ear 3 can be welded to the current collector 1 by laser welding, and the two pole ears 3 are connected to the current collector 1, and the two pole ears 3 are connected to each other.
- a pole piece with a bipolar ear structure in which pole ears are welded on both sides of the current collector 1 is formed, and the pole piece with a bipolar ear structure is conducive to the conduction of current, thereby effectively reducing the internal resistance of the battery cell, reducing the heat generated when the battery cell is quickly charged, and effectively improving the service life and safety performance of the battery cell.
- the first groove 21 and the second groove 22 are located at non-end positions in the length direction of the pole piece (the length direction of the pole piece is the X direction in FIG1 ), that is, the first groove 21 and the second groove 22 are located at positions other than the two ends of the active material layer 2, which may be 1/15, 1/5, 1/3, 1/2 or other non-end positions of the active material layer along the X direction, without making too many restrictions here.
- the two pole tabs 3 are connected to each other through a current collector 4.
- the current collector 4 increases the contact area of the two pole tabs 3 and improves the connection strength of the two pole tabs 3, thereby improving the conductivity of the current at the connection between the two pole tabs 3 and reducing the heat generated when the pole tabs 3 are quickly charged and discharged.
- the first groove 21 and the second groove 22 at least penetrate one end of the active material layer 2 along the width direction of the pole piece (the width direction of the pole piece is the Y direction in FIG1 ), and the cleaning method of the first groove 21 and the second groove 22 can be laser cleaning, mechanical cleaning, or foam cleaning, etc., and no excessive restrictions are made here.
- the first groove 21 and the second groove 22 only penetrate one end of the active material layer 2 along the Y direction, and the pole ear 3 inserted in the first groove 21 and the second groove 22 extends from the through end of the groove to the outside of the groove, and the parts of the two pole ears 3 extending outside the groove are connected by the current collector 4.
- the end of the first groove 21 and the second groove 22 that does not completely penetrate the Y direction can provide support for the pole ear 3 during welding, thereby improving the stability of the welding of the pole ear 3.
- the first groove 21 and the second groove 22 can also completely penetrate both ends of the active material layer 2 along the Y direction.
- the pole tab 3 includes a metal sheet 31 and an insulating glue 32 arranged on the periphery of the metal sheet 31 , two metal sheets 31 are respectively inserted into the first groove 21 and the second groove 22 , and the two metal sheets 31 are connected by the current collector 4 , and the two insulating glues 32 are arranged side by side along the first direction, and the first direction is the X direction.
- the first groove 21 and the second groove 22 are arranged opposite to each other, and the first groove 21 and the second groove 22 are arranged symmetrically about the current collector 1 , so that the first groove 21 and the second groove 22 are formed at one time during the production process, and the production is convenient.
- the size of the first groove 21 and the second groove 22 along the X direction is greater than or equal to twice the size of the insulating glue 32 along the X direction, so that the insulating glue 32 of the two pole tabs 3 is arranged side by side along the X direction, and the two insulating glues 32 are prevented from interfering with each other when the metal sheets 31 of the two pole tabs 3 are respectively inserted into the first groove 21 and the second groove 22 , thereby ensuring the welding strength between the metal sheet 31 and the current collector 1 and the connection strength between the metal sheet 31 and the current collector 4.
- first groove 21 and the second groove 22 are arranged side by side along the X direction of the projection of the current collector 1, and the size of the first groove 21 and the second groove 22 along the X direction is slightly larger than the size of the insulating glue 32 along the X direction, which can also avoid the interference of the two insulating glues 32 when the two metal sheets 31 are welded to the current collector 1.
- the thickness of the insulating glue 32 of the two tabs 3 is relatively thin, that is, when the projections of the two insulating glues 32 on the current collector 1 overlap, the two insulating glues 32 located at the overlapping part of the projection are still arranged at intervals, and the first groove 21 and the second groove 22 slightly larger than the size of the metal sheet 31 along the X direction can be directly arranged.
- the thickness of the active material layer 2 is in the range of 0.05 to 0.2 mm; the thickness of the pole ear 3 is in the range of 0.1 to 0.7 mm; and the thickness of the insulating glue 32 is in the range of 0.05 to 0.3 mm. It should be noted that the above thickness directions are all the thickness directions of the unfolded pole piece (the thickness direction of the unfolded pole piece is the Z direction in Figure 1).
- the embodiment of the present application also provides a battery cell, as shown in FIG3 , the battery cell is formed by winding a separator 5 and a positive electrode sheet 6 and a negative electrode sheet 7 located on both sides of the separator 5 , and the positive electrode sheet 6 and the negative electrode sheet 7 are the electrode sheets of any of the above embodiments.
- a first groove 21 and a second groove 22 are provided on the positive electrode sheet 6, and a pole ear 3 is provided in each of the first groove 21 and the second groove 22, and the two pole ears 3 are connected to form a positive total pole ear.
- the active material layer 2 on the opposite sides of the negative electrode sheet 7 is provided with a first avoidance groove 23 and a second avoidance groove 24 at the positions of the first groove 21 and the second groove 22, respectively.
- a storage space that can accommodate the pole ear 3 of the positive electrode sheet 6 is formed between the first avoidance groove 23 and the first groove 21, and between the second avoidance groove 24 and the second groove 22.
- the pole ear 3 of the positive electrode sheet 6 protruding from the first groove 21 and the second groove 22 can be avoided when the positive electrode sheet 6 and the negative electrode sheet 7 are wound into a battery cell, which can reduce the thickness increase caused by the pole ear 3, thereby reducing the thickness of the battery cell and improving the overall energy density of the battery cell.
- the first avoidance groove 23 and the second avoidance groove 24 are formed on the positive electrode sheet 6 to avoid the tab 3 on the negative electrode sheet 7, thereby preventing the tab 3 from protruding from the active material layer 2 and causing a thickness difference problem, thereby improving the flatness of the battery cell.
- the thickness of the pole ear 3 is less than or equal to the dimension of the accommodation space along the second direction (the second direction is the thickness direction of the unfolded pole piece, i.e., the Z direction in FIG1 ), and the Z direction is perpendicular to the X direction, i.e., the pole ear 3 can be completely accommodated in the accommodation space, effectively improving the thickness difference of the battery cell at this position and improving the flatness of the battery cell.
- the pole piece also includes adhesive tape, and the exposed part of the pole ear 3 after welding is covered with adhesive tape, which can prevent the burrs of the pole ear 3 from piercing the diaphragm 5 and causing a short circuit inside the battery cell, enhance the insulation between the pole pieces, and thus ensure the service life and safety performance of the battery cell.
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- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
提供一种极片及电芯，其中极片包括集流体和活性物质层，活性物质层设置于集流体的相对两侧面，一侧的活性物质层上开设有第一凹槽，另一侧的活性物质层上开设有第二凹槽，第一凹槽和第二凹槽的槽底均贯穿至集流体，第一凹槽与第二凹槽分别插设一个极耳，两个极耳均与集流体连接，且两个极耳相互连接。
Description
本申请要求在2023年2月8日提交中国专利局、申请号为2023201893728的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
本申请涉及电芯技术领域，例如涉及一种极片及电芯。
伴随电芯技术的快速发展，人们对于锂离子电芯的能量密度和倍率放电以及放电温升都提出了更高的要求。
目前常采用单一极耳与集流体一侧焊接的极片生产技术，电芯由两个极性相反的极片和隔膜卷绕成型，相关技术存在以下技术缺陷：单一极耳形式的电芯内阻很大，快速充电时产热高，影响电芯的使用寿命和安全性能。
本申请提供一种极片，其结构简单，且其安全性能好。
本申请提供一种电芯，其结构简单，且其厚度较薄。
本申请实施例采用以下技术方案：
第一方面，本申请实施例提供一种极片，包括集流体和活性物质层，所述活性物质层设置于所述集流体的相对两侧面，一侧的所述活性物质层上开设有第一凹槽，另一侧的所述活性物质层上开设有第二凹槽，所述第一凹槽和所述第二凹槽的槽底均贯穿至所述集流体，所述第一凹槽与所述第二凹槽分别插设一个极耳，两个所述极耳均与所述集流体连接，且两个所述极耳相互连接。
在一实施例中，两个所述极耳通过集流片连接。
在一实施例中，所述极耳包括金属片和设于所述金属片外周的绝缘胶，两个所述金属片分别插设于所述第一凹槽和所述第二凹槽，且两个所述金属片通过所述集流片连接，两个所述绝缘胶沿第一方向并排设置，所述第一方向为所述极片展开的长度方向。
在一实施例中，所述第一凹槽与所述第二凹槽相对设置，所述第一凹槽与所述第二凹槽沿所述第一方向的尺寸大于或等于所述绝缘胶沿所述第一方向的尺寸的两倍；或，
所述第一凹槽及所述第二凹槽于所述集流体的投影沿所述第一方向并排设置，所述第一凹槽及所述第二凹槽沿所述第一方向的尺寸大于所述绝缘胶沿所述第一方向的尺寸。
在一实施例中，所述极片的尺寸满足如下至少之一：所述活性物质层厚度范围为0.05～0.2mm；所述极耳厚度范围为0.1～0.7mm；所述绝缘胶厚度范围为0.05～0.3mm。
在一实施例中，所述第一凹槽与所述第二凹槽至少贯穿所述活性物质层沿所述极片展开宽度方向的一端。
在一实施例中，所述第一凹槽和所述第二凹槽位于所述极片展开长度方向的非端部位置。
第二方面，本申请实施例提供一种电芯，所述电芯由隔膜以及位于所述隔膜两侧的正极片和负极片卷绕而成，所述正极片和所述负极片为上述的极片。
在一实施例中，所述正极片和所述负极片两者中一个开设有所述极片的第一凹槽和所述极片的第二凹槽，所述正极片和所述负极片两者中另一个相对所述第一凹槽位置和所述第二凹槽位置分别开设有第一避空槽和第二避空槽，电芯卷绕后正对的所述第一避空槽和所述第一凹槽之间、所述第二避空槽和所述第二凹槽之间均形成可以容纳所述极片的极耳的容纳空间。
在一实施例中，所述极耳的厚度小于或等于所述容纳空间沿第二方向的尺寸。
本申请的有益效果为：通过在集流体相对两侧面的活性物质层上分别开设一个凹槽，两个凹槽内均焊接一个极耳，两个极耳均与集流体连接且两个极耳相互连接，形成集流体两面均焊接极耳的双极耳结构的极片，双极耳结构的极片有利于电流的传导，从而有效降低电芯的内部电阻，减少电芯快速充电时热量的产生，有效提升电芯的使用寿命和安全性能。
图1为本申请实施例的极片的结构示意图；
图2为本申请实施例的集流体与活性物质层的配合示意图；
图3为本申请实施例的电芯的的结构示意图；
图4为本申请实施例的正极片、负极片与隔膜的配合示意图；
图中：
1、集流体；2、活性物质层；21、第一凹槽；22、第二凹槽；23、第一避空槽；24、第二避空槽；3、极耳；31、金属片；32、绝缘胶；4、集流片；5、隔膜；6、正极片；7、负极片。
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据情况理解上述术语在本申请中的含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
如图1和图2所示，本申请实施例的极片包括集流体1和活性物质层2，活性物质层2设置于集流体1的相对两侧面，一侧的活性物质层2上开设有第一凹槽21，另一侧的活性物质层2上开设有第二凹槽22，第一凹槽21和第二凹槽22的槽底均贯穿至集流体1，第一凹槽21与第二凹槽22分别插设一个极耳3，极耳3可以通过激光焊接的方式与集流体1进行焊接，两个极耳3均与集流体1连接，且两个极耳3相互连接。通过在集流体1的相对两侧面的每个侧面焊接一个极耳3，且两个极耳3相互连接，形成集流体1两面均焊接极耳的双极耳结构的极片，双极耳结构的极片有利于电流的传导，从而有效降低电芯的内部电阻，减少电芯快速充电时热量的产生，有效提升电芯的使用寿命和安全性能。
值得注意的是，如图1所示，第一凹槽21和第二凹槽22位于极片展开长度方向的非端部位置（极片展开的长度方向为图1中X方向），即第一凹槽21和第二凹槽22位于活性物质层2除两端外的其他位置，可以为活性物质层沿X方向的1/15、1/5、1/3、1/2或其他非端部位置，在此不做过多限制。
在本实施例中，如图1所示，两个极耳3通过集流片4相互连接。通过集流片4以增大两个极耳3的接触面积，提升两个极耳3的连接强度，从而提升两个极耳3连接处电流的导电性，减少极耳3快速充放电时热量的产生。
可选地，如图1所示，第一凹槽21与第二凹槽22至少贯穿活性物质层2沿极片展开宽度方向的一端（极片展开的宽度方向为图1中Y方向），第一凹槽21和第二凹槽22的清洗方式可以为激光清洗、机械清洗或者发泡胶清洗等方式，在此不做过多限制。在本实施例中，第一凹槽21与第二凹槽22只贯穿活性物质层2沿Y方向的一端，插设于第一凹槽21和第二凹槽22内的极耳3由凹槽的贯穿端延伸至凹槽外，两个极耳3延伸至凹槽外的部分再由集流片4连接，同时第一凹槽21与第二凹槽22未完全贯穿Y方向的一端可提供极耳3焊接时的支撑，提升极耳3焊接的稳定性。在其他实施例中，第一凹槽21与第二凹槽22也可以沿Y方向完全贯穿活性物质层2的两端。
示例性地，如图1所示，极耳3包括金属片31和设于金属片31外周的绝缘胶32，两个金属片31分别插设于第一凹槽21和第二凹槽22，且两个金属片31通过集流片4连接，两个绝缘胶32沿第一方向并排设置，第一方向为X方向。在本实施例中，第一凹槽21与第二凹槽22相对设置，第一凹槽21与第二凹槽22关于集流体1对称设置，便于生产过程中一次性同时形成第一凹槽21与第二凹槽22，生产便利。第一凹槽21与第二凹槽22沿X方向的尺寸大于或等于绝缘胶32沿X方向的尺寸的两倍，使两个极耳3的绝缘胶32沿X方向并排设置，避免两个极耳3的金属片31分别插设于第一凹槽21和第二凹槽22时两个绝缘胶32相互干涉，从而保证金属片31与集流体1的焊接强度和金属片31与集流片4的连接强度。在其他实施例中，第一凹槽21及第二凹槽22于集流体1的投影沿X方向并排设置，第一凹槽21及第二凹槽22沿X方向的尺寸略大于绝缘胶32沿X方向的尺寸，同样也可以避免两个金属片31与集流体1焊接时两个绝缘胶32存在干渉。当然两个极耳3的绝缘胶32厚度较薄时，即两个绝缘胶32关于集流体1的投影存在重合时，位于投影重合部分的两个绝缘胶32仍间隔设置，则可以直接设置略大于金属片31沿X方向尺寸的第一凹槽21和第二凹槽22。
示例性地，如图1和图2所示，活性物质层2厚度范围为0.05～0.2mm；极耳3厚度范围为0.1～0.7mm；绝缘胶32厚度范围为0.05～0.3mm。需要说明的是，上述厚度方向均为极片展开的厚度方向(极片展开的厚度方向为图1中Z方向)。
本申请实施例还提供一种电芯，如图3所示，电芯由隔膜5以及位于隔膜5两侧的正极片6和负极片7卷绕而成，正极片6和负极片7为上述任意实施例的极片。
可选地，如图4所示，正极片6上开设有第一凹槽21和第二凹槽22，且第一凹槽21和第二凹槽22内均设有极耳3，两个极耳3连接形成正极总极耳，此时，负极片7上相对两侧面的活性物质层2对应第一凹槽21位置和第二凹槽22位置分别开设有第一避空槽23和第二避空槽24，卷绕后正对的第一避空槽23和第一凹槽21之间、第二避空槽24和第二凹槽22之间均形成可以容纳正极片6的极耳3的容纳空间。通过在负极片7上设置第一避空槽23和第二避空槽24，可在正极片6和负极片7卷绕成电芯时对正极片6凸出于第一凹槽21和第二凹槽22的极耳3进行避让，可以降低由于极耳3带来的厚度增加，从而降低电芯厚度，提升电芯整体的能量密度。此外，当负极片7上开设第一凹槽21和第二凹槽22，则正极片6上设有第一避空槽23和第二避空槽24以避让负极片7上的极耳3，避免极耳3凸出于活性物质层2造成厚度差问题，提升电芯的平整性。
可选地，如图3所示，极耳3的厚度小于或等于容纳空间沿第二方向的尺寸（第二方向为极片展开的厚度方向即图1中Z方向），Z方向与X方向垂直，即极耳3可以完全容纳于容纳空间内，有效改善电芯在该位置的厚度差，提升电芯的平整性。
示例性地，极片还包括胶纸，极耳3焊接后的裸露部分均铺设有胶纸，可以避免极耳3的毛刺穿破隔膜5而导致电芯内部短路，增强极片间的绝缘性，从而保证电芯的使用寿命和安全性能。
于本文的描述中，需要理解的是，术语“上”、“下”等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
Claims (10)
- 一种极片，包括集流体（1）和活性物质层（2），所述活性物质层（2）设置于所述集流体（1）的相对两侧面，一侧的所述活性物质层（2）上开设有第一凹槽（21），另一侧的所述活性物质层（2）上开设有第二凹槽（22），所述第一凹槽（21）和所述第二凹槽（22）的槽底均贯穿至所述集流体（1），所述第一凹槽（21）与所述第二凹槽（22）分别插设一个极耳（3），两个所述极耳（3）均与所述集流体（1）连接，且两个所述极耳（3）相互连接。
- 根据权利要求1所述的极片，其中，两个所述极耳（3）通过集流片（4）连接。
- 根据权利要求2所述的极片，其中，所述极耳（3）包括金属片（31）和设于所述金属片（31）外周的绝缘胶（32），两个所述金属片（31）分别插设于所述第一凹槽（21）和所述第二凹槽（22），且两个所述金属片（31）通过所述集流片（4）连接，两个所述绝缘胶（32）沿第一方向（X）并排设置，所述第一方向（X）为所述极片展开的长度方向。
- 根据权利要求3所述的极片，其中，所述第一凹槽（21）与所述第二凹槽（22）相对设置，所述第一凹槽（21）与所述第二凹槽（22）沿所述第一方向（X）的尺寸大于或等于所述绝缘胶（32）沿所述第一方向（X）的尺寸的两倍；或，所述第一凹槽（21）及所述第二凹槽（22）于所述集流体（1）的投影沿所述第一方向（X）并排设置，所述第一凹槽（21）及所述第二凹槽（22）沿所述第一方向（X）的尺寸大于所述绝缘胶（32）沿所述第一方向（X）的尺寸。
- 根据权利要求3或4所述的极片，其中，所述极片的尺寸满足如下至少之一：所述活性物质层（2）厚度范围为0.05～0.2mm；所述极耳（3）厚度范围为0.1～0.7mm；所述绝缘胶（32）厚度范围为0.05～0.3mm。
- 根据权利要求1至4任一项所述的极片，其中，所述第一凹槽（21）与所述第二凹槽（22）至少贯穿所述活性物质层（2）沿所述极片展开宽度方向的一端。
- 根据权利要求1至4任一项所述的极片，其中，所述第一凹槽（21）和所述第二凹槽（22）位于所述极片展开长度方向的非端部位置。
- 一种电芯，所述电芯由隔膜（5）以及位于所述隔膜（5）两侧的正极片（6）和负极片（7）卷绕而成，所述正极片（6）和所述负极片（7）为权利要求1至7任一项所述的极片。
- 根据权利要求8所述的电芯，其中，所述正极片（6）和所述负极片（7）两者中一个开设有所述极片的第一凹槽（21）和所述极片的第二凹槽（22），所述正极片（6）和所述负极片（7）两者中另一个相对所述第一凹槽（21）位置和所述第二凹槽（22）位置分别开设有第一避空槽（23）和第二避空槽（24），所述电芯卷绕后正对的所述第一避空槽（23）和所述第一凹槽（21）之间、所述第二避空槽（24）和所述第二凹槽（22）之间均形成可以容纳所述极片的极耳（3）的容纳空间。
- 根据权利要求9所述的电芯，其中，所述极耳（3）的厚度小于或等于所述容纳空间沿第二方向（Z）的尺寸。
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| CN113366682A (zh) * | 2020-09-14 | 2021-09-07 | 东莞新能安科技有限公司 | 电化学装置及电子装置 |
| CN113826240A (zh) * | 2020-12-30 | 2021-12-21 | 宁德新能源科技有限公司 | 电极组件和电化学装置 |
| CN216354304U (zh) * | 2021-12-06 | 2022-04-19 | 珠海冠宇电池股份有限公司 | 极片及电池 |
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| CN219553673U (zh) * | 2023-03-22 | 2023-08-18 | 惠州市华沃科技有限公司 | 一种具有多层集流体的极片、电池卷芯及高倍率电池 |
| CN220672809U (zh) * | 2023-08-04 | 2024-03-26 | 浙江锂威能源科技有限公司 | 一种新型极耳、极片及电池 |
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| CN113826240A (zh) * | 2020-12-30 | 2021-12-21 | 宁德新能源科技有限公司 | 电极组件和电化学装置 |
| CN113054156A (zh) * | 2021-03-11 | 2021-06-29 | 珠海冠宇电池股份有限公司 | 一种电极组件及其应用 |
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| CN219286442U (zh) * | 2023-02-08 | 2023-06-30 | 惠州亿纬锂能股份有限公司 | 极片及电芯 |
| CN219553673U (zh) * | 2023-03-22 | 2023-08-18 | 惠州市华沃科技有限公司 | 一种具有多层集流体的极片、电池卷芯及高倍率电池 |
| CN220672809U (zh) * | 2023-08-04 | 2024-03-26 | 浙江锂威能源科技有限公司 | 一种新型极耳、极片及电池 |
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