Tab coating process and apparatus

Abstract

The application belongs to the technical field of tab coating and specifically relates to a tab coating process method and equipment, which comprises the following steps: S1, cutting a first raw material and a second raw material respectively to obtain a first current collector and a second current collector; S2, conveying the first current collector and the second current collector respectively so that at least part of a structure layer of the first current collector and the second current collector is placed in a superimposed manner; S3, using a dressing die head to perform dressing treatment on a first non-superimposed overlapping area on the first current collector to form a first dressing layer, and simultaneously using the dressing die head to perform dressing treatment on a second non-superimposed overlapping area on the second current collector to form a second dressing layer. The application can improve the processing efficiency, and can guarantee the consistency of the width and other sizes of the dressing in a single tab, so as to improve the energy density of the battery cell.

Description

Technical Field

[0001] This invention belongs to the field of electrode coating technology, and particularly relates to an electrode coating process method and equipment. Background Technology

[0002] Lithium-ion batteries are characterized by high energy density and good environmental performance. They possess advantages such as high capacity, high reliability, and good processability, making them widely used in various fields, including portable electronic devices, vehicles, and transportation tools. Lithium-ion batteries include single-tab batteries and multi-tab batteries. For multi-tab batteries, the tab coating process typically employs the zebra coating process.

[0003] However, under this process, the energy density of the cell is easily reduced due to inconsistent width of the internal cathode coating film and coating misalignment, resulting in poor stability and low production efficiency of the produced battery cells. Summary of the Invention

[0004] The purpose of this invention is to provide a tab coating process method to address the shortcomings of existing technologies, thereby improving coating quality and efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tab coating process includes:

[0007] S1. Cut the first raw material and the second raw material respectively to obtain the first current collector and the second current collector;

[0008] S2. The first current collector and the second current collector are respectively conveyed so that the first current collector and the second current collector are at least partially stacked in a structural manner;

[0009] S3. Apply a dressing die to the first non-overlapping area on the first manifold to form a first dressing layer; and simultaneously apply the dressing die to the second non-overlapping area on the second manifold to form a second dressing layer.

[0010] Preferably, the step of separately cutting the first raw material and the second raw material to obtain the first current collector and the second current collector includes the following:

[0011] At least two sets of relatively staggered cutting blades are used to cut the scraps of the first raw material and the second raw material respectively to obtain a first collector with a first width and a second collector with a second width; wherein the size of the first width is the same as the size of the second width.

[0012] Preferably, the step of separately conveying the first current collector and the second current collector includes the following:

[0013] The first current collector is conveyed by a first conveying roller, and the second current collector is conveyed by a second conveying roller, so that the first current collector and the second current collector are at least partially stacked, thereby forming a stacked stepped structure.

[0014] Preferably, in the stacked stepped structure, the relationship between the orthographic projection area M1 of the second non-stacked overlapping area in the second current collector and the orthographic projection M2 of the overlapping area between the first current collector and the second current collector satisfies: M1 = A * M2, A = (2 ~ 2.5);

[0015] And / or, in the stacked stepped structure, the relationship between the orthographic projection area M3 of the first non-stacked overlapping area in the first current collector and the orthographic projection M2 of the overlapping area between the first current collector and the second current collector satisfies: M3 = B * M2, B = (3 ~ 4).

[0016] Preferably, the steps of applying a dressing to a first non-overlapping area on the first manifold using a dressing die to form a first dressing layer, and simultaneously applying the dressing to a second non-overlapping area on the second manifold using the dressing die to form a second dressing layer, include the following:

[0017] The second current collector is conveyed through the contact bottom of the first dressing section in the dressing head to form the second dressing layer on the first non-overlapping area;

[0018] Simultaneously, the first current collector is conveyed through the contact bottom of the second dressing section of the dressing head to form the first dressing layer on the second non-overlapping area;

[0019] The relationship between the width L2 of the first dressing segment and the width L1 of the second dressing segment satisfies: L1 = L2; and a dressing step structure is formed between the contact bottom of the first dressing segment and the contact bottom of the second dressing segment.

[0020] Preferably, after the steps of applying a dressing to the first non-overlapping area on the first manifold using the dressing mold head and simultaneously applying the dressing to the second non-overlapping area on the second manifold using the dressing mold head, the process includes the following:

[0021] The first non-overlapping area is coated with an active material to form an active material layer, the first dressing layer, and the first current collector layer stacked in sequence.

[0022] The second non-overlapping area is coated with an active material to form an active material layer, a second dressing layer, and a second current collector layer stacked sequentially.

[0023] Preferably, an active material coating die is used to coat the first non-overlapping area with an active material, and simultaneously the active material coating die is used to coat the second non-overlapping area with an active material.

[0024] The present invention also discloses a tab coating apparatus for performing the tab coating process described above; the tab coating apparatus includes a conveying mechanism, a cutting mechanism, and a dressing die head arranged sequentially along the conveying direction; the conveying mechanism includes at least one first conveying roller and at least one second conveying roller; each of the cutting mechanisms includes a cutting rotating roller and a cutting blade assembly connected to the cutting rotating roller; the dressing die head includes a first dressing section and a second dressing section connected to each other, and the contact bottom of the first dressing section and the contact bottom of the second dressing section are arranged in a stepped structure.

[0025] Preferably, the relationship between the width L2 of the first dressing segment and the width L1 of the second dressing segment satisfies: L1 = L2;

[0026] And / or, the difference between the lowest point height of the first dressing segment and the lowest point height of the adjacent second dressing segment, as well as the difference between the lowest point heights of two adjacent first dressing segments, are both H;

[0027] H = 0.01~1mm.

[0028] Preferably, the first dressing section includes a first connecting block and a second connecting block arranged side by side; and a first discharge channel is formed between the first connecting block and the second connecting block;

[0029] And / or, the second dressing section includes a third connecting block and a fourth connecting block arranged side by side; and a second discharge channel is formed between the third connecting block and the fourth connecting block.

[0030] The beneficial effects of this invention are as follows: First, the first raw material and the second raw material are cut separately to obtain the first current collector and the second current collector. By cutting off the scraps of the first and second raw materials, the first and second current collectors with more suitable precision dimensions are obtained, which helps to ensure the safety of multi-tab battery cells. Then, the first and second current collectors are transported separately so that at least part of the structure between the first and second current collectors is stacked. This allows the normal second current collector and the scrap first current collector to be transported to the same station, which helps to improve the speed of subsequent coating and makes full use of space, saving equipment area. Finally, the same coating die head is used to coat the first and second current collectors simultaneously, which can realize the process of slitting before coating and effectively make the coating of the first and second current collectors uniform and consistent, as well as improve processing quality and efficiency. This can ensure the consistency of the width and other dimensions of the coating in a single tab, thereby improving the energy density of the battery cell. Attached Figure Description

[0031] The following will refer to the appendix. Figures 1-6 The features, advantages and technical effects of exemplary embodiments of the present invention are described below.

[0032] Figure 1 This is a flowchart of a tab coating process according to an embodiment of the present invention;

[0033] Figure 2 This is a flowchart of a tab coating process according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of a tab coating device according to an embodiment of the present invention;

[0035] Figure 4 This is a partial enlarged view of a tab coating apparatus according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the dressing die head of an electrode coating device according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the dressing die head of an electrode coating device according to an embodiment of the present invention.

[0038] In the diagram: 100 - Conveying mechanism; 101 - First conveying roller; 102 - Second conveying roller; 21 - First raw material; 22 - First current collector; 221 - First dressing layer; 31 - Second raw material; 32 - Second current collector; 321 - Second dressing layer; 400 - Dressing die head; 410 - First dressing section; 411 - First connecting block; 412 - Second connecting block; 413 - First discharge channel; 420 - Second dressing section; 421 - Third connecting block; 422 - Fourth connecting block; 423 - Second discharge channel; 430 - Storage container; 431 - First container; 432 - Second container; 500 - Cutting mechanism; 510 - Cutting rotating roller; 520 - Cutting blade assembly. Detailed Implementation

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments in this application, the term "and / or" merely describes the relationship between related objects in a tab coating process method and equipment description, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship within a tab coating process method and equipment.

[0043] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0044] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] The following is in conjunction with the appendix Figures 1-6 The present invention will be described in further detail, but this is not intended to limit the invention.

[0047] like Figure 1 As shown, in one embodiment of the present invention, the electrode coating process includes:

[0048] S1. Cut the first raw material and the second raw material respectively to obtain the first current collector and the second current collector;

[0049] S2. The first current collector and the second current collector are respectively conveyed so that the first current collector and the second current collector are at least partially stacked in a structural manner;

[0050] S3. Apply a dressing die to the first non-overlapping area on the first manifold to form a first dressing layer; and simultaneously apply the dressing die to the second non-overlapping area on the second manifold to form a second dressing layer.

[0051] The technical solution of this invention firstly cuts the first raw material and the second raw material to obtain the first current collector and the second current collector. By cutting off the scraps of the first and second raw materials, the first and second current collectors with more suitable precision dimensions are obtained, which helps to ensure the safety of multi-tab battery cells. Then, the first and second current collectors are transported separately so that at least part of the structure of the first and second current collectors is stacked. This allows the normal second current collector and the scrap first current collector to be transported to the same station, which helps to improve the speed of subsequent coating and makes full use of space, saving equipment area. Finally, the same coating die head is used to coat the first and second current collectors simultaneously, which can realize the first stripping and then coating, and effectively make the coating of the first and second current collectors uniform and consistent, as well as improve processing quality and efficiency. In addition, it can ensure the consistency of the width and other dimensions of the coating in a single tab, so as to improve the energy density of the battery cell.

[0052] Specifically, in some embodiments, the step of cutting the first raw material and the second raw material respectively in S1 to obtain the first current collector and the second current collector includes the following:

[0053] At least two sets of relatively staggered cutting blades are used to cut the scraps of the first raw material and the second raw material respectively to obtain a first current collector with a first width and a second current collector with a second width; wherein the size of the first width is the same as the size of the second width; the first width D1 = 10~500mm; the second width D2 = 10~500mm. In some embodiments, the scrap D3 of the first raw material is 1~100mm; the scrap D3 of the second raw material is 1~100mm. For example... Figure 3 As shown, at least two sets of relatively staggered cutting blades are horizontally parallel but not vertically aligned. This means that further fine cutting of the first and second raw materials to obtain first and second current collectors of the same width improves processing efficiency and the uniformity of multiple tabs, thereby contributing to increased energy density of the battery cell.

[0054] Specifically, in some embodiments, step S2, which involves respectively conveying the first current collector and the second current collector, includes the following:

[0055] The first current collector is conveyed by a first conveying roller 101, and the second current collector is conveyed by a second conveying roller 102, so that the first current collector and the second current collector are at least partially stacked, thereby forming a stacked stepped structure.

[0056] In some embodiments, in the stacked stepped structure, the relationship between the orthographic projection area M1 of the second non-overlapping area in the second current collector and the orthographic projection M2 of the overlapping area between the first and second current collectors satisfies: M1 = A * M2, A = (2~2.5). In the stacked stepped structure, the relationship between the orthographic projection area M3 of the first non-overlapping area in the first current collector and the orthographic projection M2 of the overlapping area between the first and second current collectors satisfies: M3 = B * M2, B = (3~4). Here, the orthographic projection is the projection of the first or second current collector from top to bottom. That is, the second current collector, as the current collector for the normal electrode in the middle of the multi-electrode, should have a relatively large dressing coverage area, and should be combined with the first current collector as the current collector for the edge electrode in the middle of the multi-electrode; this facilitates subsequent assembly.

[0057] Specifically, in some embodiments, step S3, which involves applying a dressing mold to a first non-overlapping area on the first manifold to form a first dressing layer, and simultaneously applying the dressing mold to a second non-overlapping area on the second manifold to form a second dressing layer, includes the following:

[0058] The second current collector 32 is conveyed through and abuts the bottom of the first dressing section 410 in the dressing die head to form the second dressing layer 321 on the first non-overlapping area;

[0059] Simultaneously, the first current collector 22 is conveyed through and abuts the bottom of the second dressing section 420 of the dressing mold head to form the first dressing layer 221 on the second non-overlapping area;

[0060] The relationship between the width L2 of the first dressing segment 410 and the width L1 of the second dressing segment 420 satisfies: L1 = L2; and a dressing step structure is formed between the contact bottom of the first dressing segment 410 and the contact bottom of the second dressing segment 420. In some embodiments, the difference between the lowest point height of the first dressing segment 410 and the lowest point height of the adjacent second dressing segment 420 is H; H = 0.01~1mm. For example... Figure 6As shown, there are two first coating sections 410 and two second coating sections 420. One second coating section 420, one first coating section 410, another first coating section 410, and another second coating section 420 are arranged in a stepped manner. The height difference between two adjacent first coating sections 410 is also H; H = 0.01-1mm. That is, the slit multilayer first and second current collectors are coated through the coating die 400, and the coating width is 75mm. The height difference between adjacent first coating sections 410 and second coating sections 420 means that after the coating is extruded from the coating die 400, it falls onto the multilayer first and second current collectors, thereby improving the efficiency of the raised section and ensuring the uniformity and stability of the coating.

[0061] In some embodiments, both the first current collector and the second current collector are made of aluminum; both the first dressing layer and the second dressing layer are made of lithium cobalt oxide.

[0062] Specifically, in some implementations, such as Figure 2 As shown, after step S3, the electrode coating process further includes:

[0063] S4. Apply an active material coating to the first non-overlapping area to form an active material layer, the first dressing layer, and the first current collector layer stacked sequentially.

[0064] S5. Apply an active material coating to the second non-overlapping area to form an active material layer, the second dressing layer, and the second current collector layer stacked sequentially.

[0065] The active material coating die is used to coat the first non-overlapping area with active material, and simultaneously to coat the second non-overlapping area with active material. The structure of the active material coating die is identical to that of the dressing die 400, except that the internal storage container of the active material coating die contains the active material, while the internal storage container 430 of the dressing die 400 contains the dressing (lithium cobalt oxide material). Specifically, the active material coating die includes a stepped first coating section and a second coating section; each first coating section includes a fifth connecting block (triangular or trapezoidal) and a sixth connecting block (triangular or trapezoidal), with a first coating channel between the fifth and sixth connecting blocks; each second coating section includes a seventh connecting block (triangular or trapezoidal) and an eighth connecting block (triangular or trapezoidal), with a second coating channel between the seventh and eighth connecting blocks. In other words, by cutting and slitting, applying coatings, and using active coating materials, it is possible to effectively ensure the coating and width of each foil segment after coating, and to ensure that parameters such as the diaphragm width of each tab in a multi-tab are consistent, thereby achieving the goal of improving the energy density of the battery cell.

[0066] This invention also proposes a tab coating apparatus for performing a tab coating process. The specific structure of this tab coating process is described in the above embodiments. Since the tab coating apparatus employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. For example, Figure 3 As shown, the tab coating equipment includes a conveying mechanism 100, at least two cutting mechanisms 500, and a coating die head 400 arranged sequentially along the conveying direction; the conveying mechanism 100 includes at least one first conveying roller 101 and at least one second conveying roller 102; the first conveying roller 101 is used to convey a first raw material 21; the second conveying roller 102 is used to convey a second raw material 31, and the first raw material 21 and the second raw material 31 are vertically offset; each cutting mechanism 500 includes a cutting rotating roller 510 and a cutting blade assembly 520 connected to the cutting rotating roller 510. The cutting blade assembly 520 has a cutting cavity inside; the cutting blade assembly 520 is used to cut the first raw material 21 to form the first collector 22, and to cut the second raw material 31 to form the second collector 32; the dressing die head 400 includes a first dressing section 410 and a second dressing section 420 connected to each other, and the contact bottom of the first dressing section 410 and the contact bottom of the second dressing section 420 are arranged in a stepped structure; the contact bottom of the first dressing section 410 is used to apply the second collector 32; the contact bottom of the second dressing section 420 is used to apply the first collector 22.

[0067] Specifically, in some implementations, such as Figure 3 and 4 As shown, the relationship between the width L2 of the first dressing segment 410 and the width L1 of the second dressing segment 420 satisfies: L1 = L2. The consistent width of the first dressing segment 410 and the second dressing segment 420 ensures consistent dressing across different current collectors, thereby improving the consistency of the dressing film width in a single electrode and ultimately increasing the cell's energy density.

[0068] Specifically, in some implementations, such as Figure 6 As shown, the height difference between the lowest point of the first dressing section 410 and the lowest point of the adjacent second dressing section 420, as well as the height difference between the lowest points of two adjacent first dressing sections 410, are both H; H = 0.01~1mm. The height difference of each layer of the dressing die head 400 is 0.001mm-1mm, which can adapt to manifolds of different thicknesses, thereby improving the versatility and efficiency of processing.

[0069] In some implementation methods, such as Figure 4 and 5As shown, the first dressing section 410 includes a first connecting block 411 and a second connecting block 412 arranged side by side; and a first discharge channel 413 is formed between the first connecting block 411 and the second connecting block 412; the bottom of the first connecting block 411 and the bottom of the second connecting block 412 respectively abut against the second collector 32. The first connecting block 411 and the second connecting block 412 are both triangular or trapezoidal in structure; of course, other shapes and structures with the same function can also be used for the first connecting block 411 and the second connecting block 412, and no particular limitation is made here.

[0070] In some implementation methods, such as Figure 4 and 5 As shown, the second dressing section 420 includes a third connecting block 421 and a fourth connecting block 422 arranged side by side; and a second discharge channel 423 is formed between the third connecting block 421 and the fourth connecting block 422; the third connecting block 421 and the fourth connecting block 422 respectively abut against the first collector 22. The third connecting block 421 and the fourth connecting block 422 are both triangular or trapezoidal in structure; of course, other shapes and structures with the same function can also be used for the third connecting block 421 and the fourth connecting block 422, and no particular limitation is made here.

[0071] In some implementation methods, such as Figure 6 As shown; the dressing mold head 400 is provided with a material storage container 430, which is connected to the first discharge channel 413 and the second discharge channel 423 respectively; wherein, in some embodiments, the material storage container 430 includes a first container 431 and a second container 432 arranged side by side; the second container 432 is connected to the second discharge channel 423; and the first container 431 is connected to the first discharge channel 413.

[0072] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0073] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A method for coating tabs, characterized in that: include: S1. Cut the first raw material and the second raw material respectively to obtain the first current collector and the second current collector; S2. The first current collector and the second current collector are respectively conveyed so that the first current collector and the second current collector are at least partially stacked in a structural manner; S3. Apply a dressing die to the first non-overlapping area on the first manifold to form a first dressing layer; and simultaneously apply the dressing die to the second non-overlapping area on the second manifold to form a second dressing layer. The second current collector is conveyed through the contact bottom of the first dressing section in the dressing mold head to form the second dressing layer on the first non-overlapping area; at the same time, the first current collector is conveyed through the contact bottom of the second dressing section in the dressing mold head to form the first dressing layer on the second non-overlapping area; and a dressing step structure is formed between the contact bottom of the first dressing section and the contact bottom of the second dressing section. The dressing head includes a first dressing section and a second dressing section connected to each other, and the contact bottom of the first dressing section and the contact bottom of the second dressing section are arranged in a stepped structure; the contact bottom of the first dressing section is used to apply a second current collector; the contact bottom of the second dressing section is used to apply a first current collector.

2. The electrode coating process according to claim 1, characterized in that: The step of separately cutting the first raw material and the second raw material to obtain the first current collector and the second current collector includes the following: At least two sets of relatively staggered cutting blades are used to cut the scraps of the first raw material and the second raw material respectively to obtain a first collector with a first width and a second collector with a second width; wherein the size of the first width is the same as the size of the second width.

3. The electrode coating process according to claim 1, characterized in that: The steps of separately conveying the first current collector and the second current collector include the following: The first current collector is conveyed by a first conveying roller, and the second current collector is conveyed by a second conveying roller, so that the first current collector and the second current collector are at least partially stacked, thereby forming a stacked stepped structure.

4. The electrode coating process according to claim 3, characterized in that: In the stacked stepped structure, the relationship between the orthographic projection area M1 of the second non-stacked overlapping area in the second current collector and the orthographic projection M2 of the overlapping area between the first current collector and the second current collector satisfies: M1=A*M2; where A=(2~2.5). And / or, in the stacked stepped structure, the relationship between the orthographic projection area M3 of the first non-stacked overlapping area in the first current collector and the orthographic projection M2 of the overlapping area between the first current collector and the second current collector satisfies: M3=B*M2; where B = (3~4).

5. The electrode coating process according to claim 1, characterized in that, The relationship between the width L2 of the first dressing segment and the width L1 of the second dressing segment satisfies: L1 = L2.

6. The electrode coating process according to claim 1, characterized in that: After the steps of applying a dressing to the first non-overlapping area on the first manifold using a dressing mold and simultaneously applying the dressing to the second non-overlapping area on the second manifold using the dressing mold, the following is included: The first non-overlapping area is coated with an active material to form an active material layer, the first dressing layer, and the first current collector layer stacked in sequence. The second non-overlapping area is coated with an active material to form an active material layer, a second dressing layer, and a second current collector layer stacked sequentially.

7. The electrode coating process according to claim 6, characterized in that: The active material coating die is used to coat the first non-overlapping area with an active material, and the active material coating die is also used to coat the second non-overlapping area with an active material.

8. A tab coating device, characterized in that: The electrode coating equipment is used to perform the electrode coating process according to any one of claims 1 to 7; the electrode coating equipment includes a conveying mechanism, a cutting mechanism and a dressing die head arranged sequentially along the conveying direction; the conveying mechanism includes at least one first conveying roller and at least one second conveying roller; each of the cutting mechanisms includes a cutting rotating roller and a cutting blade assembly connected to the cutting rotating roller; the dressing die head includes a first dressing section and a second dressing section connected to each other, and the contact bottom of the first dressing section and the contact bottom of the second dressing section are arranged in a stepped structure.

9. The electrode coating equipment according to claim 8, characterized in that: The relationship between the width L2 of the first dressing segment and the width L1 of the second dressing segment satisfies: L1 = L2; And / or, the difference between the lowest point height of the first dressing segment and the lowest point height of the adjacent second dressing segment, as well as the difference between the lowest point heights of two adjacent first dressing segments, are both H; H = 0.01~1mm.

10. The tab coating apparatus according to claim 8, characterized in that: The first dressing section includes a first connecting block and a second connecting block arranged side by side; and a first discharge channel is formed between the first connecting block and the second connecting block; and / or, the second dressing section includes a third connecting block and a fourth connecting block arranged side by side; and a second discharge channel is formed between the third connecting block and the fourth connecting block.

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