Pole piece, battery and electric equipment

Abstract

The utility model discloses a pole piece, a battery and electric equipment, the pole piece comprises a current collector, a tab and a conductive coating, the tab is connected to at least one side of the current collector along a first direction; the conductive coating is arranged on at least one side face of the current collector in the thickness direction, the first direction intersects with the thickness direction, the conductive coating comprises a first coating area and a second coating area, the first coating area is arranged on the side, away from the tab, of the second coating area, and the second coating area is arranged on the side, away from the tab, of the second coating area. And the impedance of the second coating area is greater than that of the first coating area. Therefore, the impedance of the second coating area is larger than that of the first coating area, so that the impedance of the area, close to the tab, of the pole piece is relatively large, adverse effects, such as lithium precipitation or overhigh local temperature, caused by current density difference on the pole piece are relieved or eliminated, the safety of the pole piece is improved, and the service life of the pole piece is prolonged. And the service life of the pole piece is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to an electrode, a battery, and an electrical device. Background Technology

[0002] In related technologies, lithium-ion batteries are prone to edge lithium plating, and the higher the charging rate, the more obvious the edge lithium plating phenomenon becomes. During long-term cycling, the battery is prone to bulging at the bottom and top, which can lead to safety issues. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an electrode that can alleviate or eliminate the adverse effects of current density differences on the electrode, such as lithium plating or localized overheating, thereby improving the safety of the electrode and extending its service life.

[0004] An electrode sheet according to an embodiment of the present invention includes: a current collector; an electrode tab connected to at least one side of the current collector along a first direction; and a conductive coating disposed on at least one side of the current collector along a thickness direction, wherein the first direction and the thickness direction intersect, the conductive coating including a first coating area and a second coating area, wherein the first coating area is disposed on the side of the second coating area away from the electrode tab, and the impedance of the second coating area is greater than the impedance of the first coating area.

[0005] According to the embodiment of the present invention, by setting the impedance of the second coating area to be greater than that of the first coating area, the impedance of the area of ​​the electrode near the tab is relatively large, which helps to alleviate or eliminate the adverse effects of current density differences on the electrode, such as lithium plating or local overheating, thereby improving the safety of the electrode and extending its service life.

[0006] According to some embodiments of the present invention, the impedance of the first coating region is Z1, and the ratio of the impedance of the second coating region is Z2, satisfying: 0.3≤Z1 / Z2≤0.9.

[0007] According to some embodiments of the present invention, the electrode sheet is provided with electrode tabs on both sides of the current collector along the first direction, and the first coating area is located in the middle of the current collector along the first direction and the second coating area is provided on both sides.

[0008] According to some embodiments of the present invention, the electrode sheet has a first coating area with a dimension of W0 along the first direction, and a second coating area located on one side of the first coating area with a dimension of W1 along the first direction, satisfying: W0 ≥ W1.

[0009] According to some embodiments of the present invention, the electrode sheet has a second coating area located on one side of the first coating area with a dimension of W1 along the first direction, and the current collector has a dimension of W2 along the first direction, satisfying: 0.05≤W1 / W2≤0.33.

[0010] According to some embodiments of the present invention, the electrode sheet in which the second coating area is flush with the edge of the current collector along the first direction.

[0011] According to some embodiments of the present invention, the conductive coating further includes a third coating area, which is located on at least one side of the first coating area along a second direction. The thickness direction, the first direction, and the second direction intersect, and the impedance of the third coating area is greater than that of the first coating area.

[0012] According to some embodiments of the present invention, the impedance of the first coating region is Z1, and the impedance of the third coating region is Z3, satisfying: 0.3≤Z1 / Z3≤0.9.

[0013] According to some embodiments of the present invention, the electrode sheet has a third coating area connected to the second coating area.

[0014] According to some embodiments of the present invention, the third coating area of ​​the electrode is flush with the edge of the current collector along the second direction.

[0015] According to some embodiments of the present invention, the electrode sheet has a third coating area located on one side of the first coating area with a dimension L1 along the second direction, and the current collector has a dimension L2 along the second direction, satisfying: 0.05≤L1 / L2≤0.33.

[0016] According to some embodiments of the present invention, the electrode sheet has the electrode tabs connected to both sides of the current collector along the first direction, the first coating area is located in the middle of the current collector along the first direction and the second coating area is provided on both sides, and the third coating area is provided on both sides of the first coating area along the second direction.

[0017] This utility model also proposes a battery.

[0018] The battery according to an embodiment of the present invention includes: the electrode sheet according to any of the above embodiments.

[0019] This utility model also proposes an electrical device.

[0020] The electrical equipment according to the embodiments of the present invention includes the battery described in any of the above embodiments.

[0021] The battery, the electrical device, and the electrode have the same advantages over the prior art, which will not be repeated here.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a side view of the electrode assembly according to an embodiment of the present utility model;

[0025] Figure 2 This is a top view of the electrode assembly according to Embodiment 1 of this utility model;

[0026] Figure 3 This is a top view of the electrode assembly according to Embodiment 2 of this utility model;

[0027] Figure 4 This is a top view of the electrode assembly according to Embodiment 3 of this utility model;

[0028] Figure 5 This is a top view of the electrode assembly according to Embodiment 4 of this utility model.

[0029] Figure label:

[0030] Electrode 100, first direction F1, second direction F2,

[0031] Current collector 1, tab 2, conductive coating 3, first coating area 31, second coating area 32, third coating area 33. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Hereinafter, with reference to the accompanying drawings, an electrode 100 according to an embodiment of the present invention will be described.

[0036] like Figures 1-5 As shown, the electrode 100 according to an embodiment of the present invention includes: a current collector 1, an electrode tab 2, and a conductive coating 12. The electrode tab 2 is connected to at least one side of the current collector 1 along a first direction. The conductive coating 12 is disposed on at least one side of the current collector 1 along the thickness direction. The first direction F1 intersects the thickness direction. The conductive coating 12 includes a first coating area 31 and a second coating area 32. The first coating area 31 is disposed on the side of the second coating area 32 away from the electrode tab 2. The impedance of the second coating area 32 is greater than the impedance of the first coating area 31.

[0037] Therefore, the adverse effects of current density differences on electrode 100, such as lithium plating or excessive local temperature, can be mitigated or eliminated, thereby improving the safety of electrode 100 and extending its service life.

[0038] First, such as Figures 1-2As shown, the electrode 100 includes a current collector 1 and a tab 2. The tab 2 is connected to at least one side of the current collector 1 along the first direction F1. If the tab 2 is connected to one or both sides of the current collector 1 along the first direction F1, the electrode 100 can be electrically connected to the battery terminal through the tab 2. It should be noted that the tab 2 can be separately formed and then welded to the current collector 1, or it can be integrally formed with the current collector 1. This utility model does not limit this.

[0039] The electrode 100 further includes a conductive coating 12, which is disposed on at least one side of the current collector 1 along the thickness direction. The conductive coating 12 includes a first coating area 31 and a second coating area 32. The first coating area 31 is disposed on the side of the second coating area 32 away from the tab 2. The impedance of the second coating area 32 is greater than the impedance of the first coating area 31.

[0040] For example, tabs 2 can be connected to both sides of the current collector 1 along the first direction F1, the first coating area 31 is located in the middle of the current collector 1 along the first direction F1, and second coating areas 32 are provided on both sides of the first coating area 31 along the first direction F1; or, tabs 2 can be connected to one side of the current collector 1 along the first direction F1, and second coating areas 32 are provided on the side of the first coating area 31 near the tab 2 along the first direction F1.

[0041] It should be noted that the performance of the electrode 100 can be determined by cutting the electrode 100 to separate the portion of the electrode 100 with the first coating area 31 and the portion of the electrode 100 with the second coating area 32, and then impedance detection can be performed on the portion of the electrode 100 with the first coating area 31 and the portion of the electrode 100 with the second coating area 32 respectively.

[0042] Specifically, the slurry of the conductive coating 12 includes a main material (such as lithium iron phosphate), a conductive agent, a binder, and a dispersant. Specifically, the impedance of the second coating region 32 can be greater than that of the first coating region 31 by setting the conductive agent in the slurry of the second coating region 32 to be different from that in the slurry of the first coating region 31, and by setting the conductivity of the conductive agent in the slurry of the first coating region 31 to be better than that in the slurry of the second coating region 32; or, the impedance of the second coating region 32 can be greater than that of the first coating region 31 by setting the conductive agent in the slurry of the second coating region 32 to be the same as that in the slurry of the first coating region 31, and by setting the content of the conductive agent in the slurry of the second coating region 32 to be less than that in the slurry of the first coating region 31.

[0043] It is understandable that the current density of the part of the electrode 100 near the tab 2 is relatively high. Areas with high current density are prone to lithium plating and local overheating. Therefore, by setting the impedance of the area of ​​the electrode 100 near the tab 2 to be relatively high, the current density of the area of ​​the electrode 100 near the tab 2 can be reduced in a targeted manner. This helps to alleviate or eliminate the adverse effects of the current density difference on the electrode 100, such as lithium plating or local overheating, and improves the safety of the electrode 100.

[0044] According to the embodiment of the present invention, the electrode 100 is configured such that the impedance of the second coating area 32 is greater than that of the first coating area 31, so that the impedance of the area of ​​the electrode 100 near the tab 2 is relatively large. This helps to alleviate or eliminate the adverse effects of current density differences on the electrode 100, such as lithium plating or local overheating, thereby improving the safety of the electrode 100 and extending its service life.

[0045] In some embodiments of this invention, a first transition coating region may be provided between the second coating region 32 and the first coating region 31. The impedance of the first transition coating region is less than the impedance of the second coating region 32 but greater than the impedance of the first coating region 31. This allows for better adaptation to differences in current density distribution, improving the performance of the electrode 100.

[0046] In some embodiments of this utility model, the impedance of the first coating area 31 is Z1, and the ratio of the impedance of the second coating area 32 is Z2, satisfying: 0.3 ≤ Z1 / Z2 ≤ 0.9. That is, the ratio of the impedance Z1 of the first coating area 31 to the impedance Z2 of the second coating area 32 can be set to be greater than or equal to 0.3 and less than or equal to 0.9, such as 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. Therefore, the impedance of the second coating area 32 and the impedance of the first coating area 31 can be significantly different, resulting in a more uniform current density in the electrode 100 during battery charging and discharging, which is beneficial for improving the design rationality of the electrode 100.

[0047] For example, the conductive agent in the slurry of the second coating area 32 can be the same as the conductive agent in the slurry of the first coating area 31. The conductive agent content in the slurry of the first coating area 31 can be set to 2.5%, and the conductive agent content in the slurry of the second coating area 32 can be set to 1%, so that the ratio of the impedance of the first coating area 31 to the impedance of the second coating area 32 approaches 0.5.

[0048] In some embodiments of this utility model, such as Figures 2-3As shown, the first coating area 31 and the second coating area 32 are arranged in the first direction F1. The dimension of the first coating area 31 along the first direction F1 is W0, and the dimension of the second coating area 32 located on one side of the first coating area 31 along the first direction F1 is W1, satisfying: W0 ≥ W1. Specifically, when there are two second coating areas 32, the second coating area 32, the first coating area 31, and the second coating area 32 are arranged sequentially in the first direction F1. The dimension of a single second coating area 32 along the first direction F1 is W1, and the sum of the dimensions of the two second coating areas 32 along the first direction F1 is 2 * W1.

[0049] It is understandable that the conductivity of the second coating area 32 is poor. By setting the size of the first coating area 31 to be greater than or equal to the size of the second coating area 32, the overall conductivity of the electrode 100 can be guaranteed, the material cost can be reduced, and the overall performance of the electrode 100 can be improved.

[0050] In some embodiments of this utility model, such as Figure 2 As shown, the dimension of the second coating area 32 located on one side of the first coating area 31 along the first direction F1 can be set as W1, and the dimension of the current collector 1 along the first direction F1 can be set as W2, satisfying: 0.05≤W1 / W2≤0.33. That is, the ratio of the dimension W1 of the second coating area 32 located on one side of the first coating area 31 along the first direction F1 to the dimension W2 of the current collector 1 along the first direction F1 can be set to be greater than or equal to 0.05 and less than or equal to 0.33, for example, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.33, etc. Therefore, the optimization effect of the second coating area 32 on the electrode 100 can be guaranteed, improving the overall performance of the electrode 100.

[0051] In some embodiments of this utility model, such as Figure 2 As shown, the second coating area 32 can be set flush with the edge of the current collector 1 along the first direction F1. This allows the conductive coating 12 to more comprehensively cover the current collector 1, which helps to improve the overall performance of the electrode 100.

[0052] In some embodiments of this utility model, such as Figures 4-5 As shown, the conductive coating 12 also includes a third coating area 33, which is located on at least one side of the first coating area 31 along the second direction F2. The thickness direction, the first direction F1 and the second direction F2 intersect each other. The impedance of the third coating area 33 is greater than that of the first coating area 31.

[0053] For example, tabs 2 can be connected to both sides of the current collector 1 along the first direction F1, a second coating area 32 is provided on both sides of the first coating area 31 along the first direction F1, and a third coating area 33 is provided on both sides of the first coating area 31 along the second direction F2, with the thickness direction, the first direction F1 and the second direction F2 being perpendicular to each other; or, tabs 2 can be connected to one side of the current collector 1 along the first direction F1, a second coating area 32 is provided on the side of the first coating area 31 near the tab 2 along the first direction F1, and the first coating area 33... 1. A third coating area 33 is provided on the side away from the tab 2 along the first direction F1 and on both sides of the first coating area 31 along the second direction F2, with the thickness direction, the first direction F1 and the second direction F2 being perpendicular to each other; or, the tab 2 can be connected to the current collector 1 on one side along the first direction F1, the first coating area 31 is provided on the side of the first coating area 31 close to the tab 2 along the first direction F1, and the third coating area 33 is provided on the side of the first coating area 31 away from the tab 2 along the second direction F2, with the first direction F1 and the second direction F2 being parallel.

[0054] It should be noted that the impedance of the third coating area 33 can be greater than that of the first coating area 31 by setting the conductive agent in the third coating area 33 to be different from that in the first coating area 31, and by setting the conductivity of the conductive agent in the slurry of the first coating area 31 to be better than that of the conductive agent in the slurry of the third coating area 33; or, the impedance of the third coating area 33 can be greater than that of the first coating area 31 by setting the conductive agent in the slurry of the third coating area 33 to be the same as that in the slurry of the first coating area 31, and by setting the content of the conductive agent in the slurry of the first coating area 31 to be greater than that in the slurry of the third coating area 33.

[0055] In the specific processing, the current collector 1 is first divided into sections. After the sections are divided, the first coating area 31, the second coating area 32, and the third coating area 33 are coated onto the current collector 1, wherein the first coating area 31, the second coating area 32, and the third coating area 33 do not overlap. This reduces the processing difficulty of the conductive coating 3 and helps to improve the forming quality of the electrode 100.

[0056] It is understandable that the current density in the edge region of electrode 100 is relatively high. Areas with high current density are prone to lithium plating and local overheating. Therefore, by increasing the impedance of the edge region of electrode 100, the current density in the edge region of electrode 100 can be reduced in a targeted manner. This helps to alleviate or eliminate the adverse effects of current density differences on electrode 100, such as lithium plating or local overheating, thereby improving the safety of electrode 100.

[0057] In some embodiments of this utility model, the impedance of the first coating area 31 can be set to Z1, and the impedance of the third coating area 33 can be set to Z3, satisfying: 0.3≤Z1 / Z3≤0.9. That is, the ratio of the impedance of the first coating area 31 to the impedance of the third coating area 33 can be set to be greater than or equal to 0.3 and less than or equal to 0.9, such as 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. Therefore, the impedance of the third coating area 33 and the impedance of the first coating area 31 can be significantly different, so that the current density of the electrode 100 during battery charging and discharging is more uniform, which is beneficial to improving the design rationality of the electrode 100.

[0058] For example, the conductive agent in the slurry of the third coating area 33 can be the same as the conductive agent in the slurry of the first coating area 31. The conductive agent content in the slurry of the first coating area 31 can be set to 2.5%, and the conductive agent content in the slurry of the third coating area 33 can be set to 1%, so that the ratio of the impedance of the first coating area 31 to the impedance of the third coating area 33 approaches 0.5.

[0059] In some embodiments of this utility model, such as Figures 4-5 As shown, the third coating area 33 can be connected to the second coating area 32, so that the second coating area 32 and the third coating area 33 can be arranged around the first coating area 31. This allows for a significant difference in impedance between the edge and the center of the electrode 100, resulting in a more uniform current density during battery charging and discharging, thus improving the design rationality of the electrode 100.

[0060] In some embodiments of this utility model, such as Figures 4-5 As shown, the third coating area 33 can be set flush with the edge of the current collector 1 along the second direction F2. This allows the conductive coating 12 to more completely cover the current collector 1, which helps to improve the overall performance of the electrode 100.

[0061] Of course, a second transition coating region can be provided between the third coating region 33 and the first coating region 31. The impedance of the second transition coating region is less than that of the third coating region 33 and greater than that of the first coating region 31. This allows for better adaptation to differences in current density distribution, which is beneficial for improving the performance of the electrode 100.

[0062] In some embodiments of this utility model, such as Figure 4As shown, the first coating area 31 and the third coating area 33 are arranged in the second direction F2. The dimension of the third coating area 33 located on one side of the first coating area 31 along the second direction F2 can be set as L1, and the dimension of the current collector 1 along the second direction F2 can be set as L2, satisfying: 0.05≤L1 / L2≤0.33. That is, the ratio of the dimension L1 of the third coating area 33 along the second direction F2 to the dimension L2 of the current collector 1 along the second direction F2 can be set to be greater than or equal to 0.05 and less than or equal to 0.33, for example, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.33, etc. It should be noted that the first direction F1 can be set perpendicular to the second direction F2 or parallel to the second direction F2.

[0063] Specifically, when there are two third coating areas 33, the third coating area 33, the first coating area 31 and the third coating area 33 are arranged sequentially in the second direction F2. The size of a single third coating area 33 along the second direction F2 is L2, and the sum of the sizes of the two third coating areas 33 along the second direction F2 is 2*L2.

[0064] The above settings ensure the optimization effect of the third coating area 33 on the electrode 100 and improve the overall performance of the electrode 100.

[0065] In some embodiments of this utility model, such as Figure 4 As shown, tabs 2 can be connected to both sides of the current collector 1 along the first direction. The first coating area 31 is located in the middle of the current collector 1 along the first direction F1 and has second coating areas 32 on both sides. The first coating area 31 also has third coating areas 33 on both sides along the second direction F2. This helps to improve the overall performance of the electrode 100.

[0066] This utility model also proposes a battery.

[0067] The battery according to an embodiment of the present invention includes: an electrode 100 according to any of the above embodiments.

[0068] According to the battery of the present invention, the electrode 100 has high safety and long service life, which helps to improve the overall performance of the battery.

[0069] This utility model also proposes an electrical device.

[0070] The electrical device according to the embodiments of this utility model includes a battery according to any of the above embodiments. It should be noted that the electrical device can be a new energy vehicle or a hybrid vehicle.

[0071] According to the embodiments of the present invention, the electrode 100 of the electrical equipment has high safety and long service life, which helps to improve the overall performance of the battery and thus improves the product competitiveness of the electrical equipment.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrode (100), characterized in that, include: current collector(1); A tab (2) is connected to at least one side of the current collector (1) along a first direction; A conductive coating (3) is disposed on at least one side of the current collector (1) along the thickness direction, the first direction intersecting the thickness direction. The conductive coating (3) includes a first coating area (31) and a second coating area (32). The first coating area (31) is disposed on the side of the second coating area (32) away from the tab (2). The impedance of the second coating area (32) is greater than the impedance of the first coating area (31).

2. The electrode (100) according to claim 1, characterized in that, The impedance of the first coating area (31) is Z1, and the impedance of the second coating area (32) is Z2, satisfying: 0.3≤Z1 / Z2≤0.

9.

3. The electrode (100) according to claim 1, characterized in that, The current collector (1) is connected to the tabs (2) on both sides along the first direction, and the first coating area (31) is located in the middle of the current collector (1) along the first direction and the second coating area (32) is provided on both sides.

4. The electrode (100) according to claim 1, characterized in that, The first coating area (31) has a dimension of W0 along the first direction, and the second coating area (32) located on one side of the first coating area (31) has a dimension of W1 along the first direction, satisfying: W0≥W1.

5. The electrode (100) according to claim 1, characterized in that, The second coating area (32) located on one side of the first coating area (31) has a dimension of W1 along the first direction, and the current collector (1) has a dimension of W2 along the first direction, satisfying: 0.05≤W1 / W2≤0.

33.

6. The electrode (100) according to claim 1, characterized in that, The second coating area (32) is flush with the edge of the current collector (1) along the first direction.

7. The electrode (100) according to any one of claims 1-6, characterized in that, The conductive coating (3) further includes a third coating area (33), which is located on at least one side of the first coating area (31) along the second direction. The thickness direction, the first direction and the second direction intersect each other. The impedance of the third coating area (33) is greater than that of the first coating area (31).

8. The electrode (100) according to claim 7, characterized in that, The impedance of the first coating area (31) is Z1, and the impedance of the third coating area (33) is Z3, satisfying: 0.3≤Z1 / Z3≤0.

9.

9. The electrode (100) according to claim 7, characterized in that, The third coating area (33) is connected to the second coating area (32).

10. The electrode (100) according to claim 7, characterized in that, The third coating area (33) is flush with the edge of the current collector (1) along the second direction.

11. The electrode (100) according to claim 7, characterized in that, The third coating area (33) located on one side of the first coating area (31) has a dimension of L1 along the second direction, and the current collector (1) has a dimension of L2 along the second direction, satisfying: 0.05≤L1 / L2≤0.

33.

12. The electrode (100) according to claim 7, characterized in that, The current collector (1) is connected to the tabs (2) on both sides along the first direction. The first coating area (31) is located in the middle of the current collector (1) along the first direction and is provided with the second coating area (32) on both sides. The first coating area (31) is provided with the third coating area (33) on both sides along the second direction.

13. A battery, characterized in that, include: The electrode (100) according to any one of claims 1-12.

14. An electrical appliance, characterized in that, Includes the battery according to claim 13.

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