A pole piece coating system, pole piece coating method and battery device production system

Abstract

The present application provides a pole piece coating system, a pole piece coating method and a battery device production system, wherein the pole piece coating system includes a coating machine, a drying device, a conveying device and a shaping mechanism, wherein the shaping mechanism includes a vibrating head, and the vibrating head is provided with a supporting surface. Since the height of the shaping area of ​​the supporting surface in the vibrating head is higher than the height of the bonding area, and the height of the shaping area tends to increase in the direction from the bonding area to the shaping area, by making the positive projection of the edge of the active material slurry in the first direction along the thickness direction of the collector located within the positive projection range of the shaping area along the thickness direction of the collector, under the vibration action of the vibrating head, the slurry at the edge of the active material slurry in the first direction will migrate inward, so that the thickness of the active material slurry at the edge in the first direction is thinned, thereby realizing the control of the morphology of the active material layer formed on the pole piece, which is beneficial to reducing the possibility of bulging edge phenomenon of the pole piece.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a pole piece coating system, a pole piece coating method and a battery device production system. Background Art

[0002] Battery devices have the advantages of high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0003] The coating process is a crucial step in battery production and has a significant impact on battery quality. Controlling the morphology of the active material layer formed on the electrode during the coating process has long been a concern for those skilled in the art. Summary of the Invention

[0004] In view of the above problems, the present application provides a pole piece coating system, a pole piece coating method and a battery device production system, wherein the pole piece coating system can control the morphology of the active material layer formed on the pole piece.

[0005] In the first aspect, some embodiments of the present application provide a pole piece coating system, which includes a coating machine, a drying device, a conveying device and a shaping mechanism, wherein the coating machine is used to coat the active material slurry on the first surface of the current collector; the drying device is used to dry the active material slurry; the conveying device is used to convey the current collector coated with the active material slurry to the drying device; the shaping mechanism is arranged between the coating machine and the drying device, and the shaping mechanism includes a vibrating head, the vibrating head is provided with a supporting surface, the supporting surface is used to fit the second surface of the current collector, and the second surface is relative to the first surface along the thickness direction of the current collector. Setting; the supporting surface includes a bonding area and a shaping area that are interconnected, the bonding area and the shaping area are arranged along a first direction, and the first direction, the thickness direction of the current collector and the conveying direction of the current collector are perpendicular to each other; along the thickness direction of the current collector, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the bonding area, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the shaping area, and the orthographic projection of the edge of the active material slurry in the first direction is located within the orthographic projection range of the shaping area; the height of the shaping area is higher than the height of the bonding area, and the height of the shaping area tends to increase along the direction from the bonding area to the shaping area.

[0006] In the above structure, since the height of the shaping area of ​​the supporting surface in the vibration head is higher than the height of the bonding area, and the height of the shaping area tends to increase in the direction from the bonding area to the shaping area, by making the positive projection of the edge of the active material slurry in the first direction along the thickness direction of the collector located within the positive projection range of the shaping area along the thickness direction of the collector, under the vibration action of the vibration head, the slurry at the edge of the active material slurry in the first direction will migrate inward, so that the thickness of the active material slurry at the edge in the first direction is thinned, thereby realizing the control of the morphology of the active material layer formed on the electrode, which is beneficial to reducing the possibility of bulging edge phenomenon of the electrode.

[0007] According to the electrode coating system provided in some embodiments of the present application, the shaping mechanism also includes a heater, which is located on the side of the active material slurry away from the current collector. The heater and the vibration head are arranged relative to each other along the thickness direction of the current collector, so that while the vibration head acts on the current collector, the heater also heats the active material slurry on the current collector, so that the viscosity of the active material slurry can be reduced and the migration performance can be better.

[0008] According to the electrode coating system provided in some embodiments of the present application, the shaping mechanism also includes a heater, which is located on the side of the active material slurry away from the current collector. In the conveying direction of the current collector, the heater is closer to the coater than the vibration head, so that after the heater heats the active material slurry on the current collector, the active material slurry on the current collector will be transported to the vibration head. At this time, the temperature of the active material slurry on the current collector at the vibration head has been increased, and the viscosity of the active material slurry has been reduced, which has better migration performance.

[0009] According to the pole piece coating system provided in some embodiments of the present application, the vibration head is provided with a heat dissipation structure, which includes heat dissipation holes or heat sinks, so that the temperature of the vibration head is not easy to be too high, reducing the possibility of the vibration head burning the collector.

[0010] According to the electrode coating system provided in some embodiments of the present application, the vibration frequency of the vibration head is set to D, 20kHz≤D≤50kHz, so that the sound generated by the vibration of the vibration head is not easily detected by the human ear, and the cost of the electrode coating system can be reduced; the amplitude of the vibration head is set to E, 8μm≤E≤30μm, so that the vibration of the vibration head can improve the migration performance of the active material slurry while not easily damaging the current collector.

[0011] According to the electrode coating system provided in some embodiments of the present application, a cooling channel is provided in the vibration head, and the cooling channel is used to pass a coolant so that the temperature of the vibration head can be controlled within an appropriate range, so that the temperature of the vibration head is not easily too high, thereby reducing the possibility of the vibration head scalding the collector.

[0012] According to the electrode coating system provided in some embodiments of the present application, the shaping area has a first straight line extending along the conveying direction of the current collector, a second straight line extending along the conveying direction of the current collector, a third straight line extending along the conveying direction of the current collector, and a fourth straight line extending along the conveying direction of the current collector. The first straight line, the second straight line, the third straight line, and the fourth straight line are all located on the side of the edge of the active material slurry in the first direction close to the bonding area; along the first direction, the distance between the first straight line and the edge of the active material slurry in the first direction is set to E, the distance between the second straight line and the edge of the active material slurry in the first direction is set to F, and the third straight line is set to F. The distance between the straight line and the edge of the active material slurry in the first direction is set to G, and the distance between the fourth straight line and the edge of the active material slurry in the first direction is set to H; in the vertical direction, the height of the first straight line from the fitting area is set to I, the height of the second straight line from the fitting area is set to J, the height of the third straight line from the fitting area is set to K, and the height of the fourth straight line from the fitting area is set to L, E=2mm, F=2mm, G=2mm, H=2mm, 1.3mm≤I≤1.5mm, 0.8mm≤J≤1.2mm, 0.5mm≤K≤0.7mm, 0.1mm≤L≤0.4mm.

[0013] According to the electrode coating system provided in some embodiments of the present application, the supporting surface also includes a transition zone, which connects the bonding area and the shaping area. The transition zone is configured as an arc-shaped surface, so that the bonding area and the shaping area can have a relatively smooth transition, making it less likely for abrupt height changes to occur on the supporting surface, which is beneficial to reducing damage to the current collector when the supporting surface contacts the current collector, and reducing the possibility of marks on the current collector.

[0014] According to some embodiments of the present application, the electrode coating system includes a conveyor device comprising at least two conveyor rollers, which are arranged in parallel and spaced apart and located between the coating machine and the drying device, and a vibrating head is disposed between two adjacent conveyor rollers. By arranging the at least two conveyor rollers in parallel and spaced apart, the current collector between the two adjacent conveyor rollers is horizontal, which helps reduce the possibility of active material slurry on the current collector migrating due to the current collector tilting.

[0015] In a second aspect, some embodiments of the present application provide a battery device production system, including a pole piece coating system as provided by any of the above technical solutions.

[0016] In a third aspect, some embodiments of the present application provide a pole piece coating method, the pole piece coating method comprising:

[0017] A coating machine, a drying device, a conveying device, and a shaping mechanism are provided. The shaping mechanism is arranged between the coating machine and the drying device. The shaping mechanism includes a vibrating head, the vibrating head is provided with a supporting surface, and the supporting surface includes a laminating area and a shaping area connected to each other. The laminating area and the shaping area are arranged along a first direction. The height of the shaping area is higher than the height of the laminating area. The height of the shaping area increases along the direction from the laminating area to the shaping area.

[0018] Applying the active material slurry to the first surface of the current collector using a coating machine;

[0019] The current collector coated with the active material slurry is conveyed to the drying device by a conveying device, wherein the conveying direction of the current collector, the first direction, and the thickness direction of the current collector are perpendicular to each other;

[0020] The abutting surface is adhered to the second surface of the current collector, and the second surface and the first surface are arranged opposite to each other along the thickness direction of the current collector; along the thickness direction of the current collector, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the bonding area, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the shaping area, and the orthographic projection of the edge of the active material slurry in the first direction is located within the orthographic projection range of the shaping area.

[0021] According to the electrode coating method provided in some embodiments of the present application, the shaping mechanism further includes a heater. Before the abutting surface is brought into contact with the second surface of the current collector, the electrode coating method further includes:

[0022] The active material slurry on the first surface is heated by a heater.

[0023] According to the electrode coating method provided in some embodiments of the present application, the temperature of the active material slurry after heating is M, 45°C≤M≤70°C.

[0024] In a fourth aspect, some embodiments of the present application provide a battery device production system, which includes the electrode coating system provided by the above technical solution.

[0025] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0026] The present application provides a pole piece coating system, which includes a coating machine, a drying device, a conveying device and a shaping mechanism, wherein the coating machine is used to coat the active material slurry on the first surface of the current collector; the drying device is used to dry the active material slurry; the conveying device is used to convey the current collector coated with the active material slurry to the drying device; the shaping mechanism is arranged between the coating machine and the drying device, and the shaping mechanism includes a vibrating head, the vibrating head is provided with a supporting surface, the supporting surface is used to fit the second surface of the current collector, and the second surface and the first surface are arranged relative to each other along the thickness direction of the current collector; the supporting surface is provided with a supporting surface, and the supporting surface is provided with a supporting surface, and the supporting surface is used to fit the second surface of the current collector. The surface includes a bonding area and a shaping area that are interconnected. The bonding area and the shaping area are arranged along a first direction. The first direction, the thickness direction of the current collector and the transport direction of the current collector are perpendicular to each other. Along the thickness direction of the current collector, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the bonding area, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the shaping area, and the orthographic projection of the edge of the active material slurry in the first direction is located within the orthographic projection range of the shaping area. The height of the shaping area is higher than the height of the bonding area, and the height of the shaping area tends to increase along the direction from the bonding area to the shaping area. In the above structure, since the height of the shaping area of ​​the supporting surface in the vibration head is higher than the height of the bonding area, and the height of the shaping area tends to increase in the direction from the bonding area to the shaping area, by making the positive projection of the edge of the active material slurry in the first direction along the thickness direction of the collector located within the positive projection range of the shaping area along the thickness direction of the collector, under the vibration action of the vibration head, the slurry at the edge of the active material slurry in the first direction will migrate inward, so that the thickness of the active material slurry at the edge in the first direction is thinned, thereby realizing the control of the morphology of the active material layer formed on the electrode, which is beneficial to reducing the possibility of bulging edge phenomenon of the electrode.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the accompanying drawings, the same reference numerals are used to denote the same components.

[0029] Figure 1 A schematic diagram of the structure of a pole piece coating system provided in some embodiments of the present application;

[0030] Figure 2 A schematic structural diagram of a pole piece coating system provided in some other embodiments of the present application;

[0031] Figure 3 A schematic diagram of the structure of the vibrating head contacting the current collector in the pole piece coating system provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of the structure of a vibrating head in a pole piece coating system provided in some embodiments of the present application;

[0033] Figure 5 A cross-sectional view of a vibrating head in a pole piece coating system provided in some embodiments of the present application;

[0034] Figure 6 Flowchart of the electrode coating method provided in some embodiments of the present application.

[0035] In the accompanying drawings: 1. Coating machine; 2. Drying device; 3. Conveying device; 31. Conveying roller; 4. Shaping mechanism; 41. Vibrating head; 411. Abutting surface; 4111. Laminating area; 4112. Shaping area; 4113. Transition area; 412. Heat dissipation structure; 413. Cooling channel; 42. Heater; 10. Current collector; 20. Active material slurry; X, first direction. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0039] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0040] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0041] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] Currently, market developments indicate that battery devices are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields.

[0043] Coating is an essential process in battery production. The coating process significantly impacts the quality of battery devices and is a key step that directly influences various performance indicators, including safety, capacity, and lifespan. Coating involves applying a polymer paste, molten polymer, or polymer melt onto paper, cloth, or plastic film to create a composite material (film). In the electrode coating process, a coater uses a coating die to apply active material slurry to the electrode surface, ensuring optimal electrical properties.

[0044] During the preparation of the electrode, the current collector coated with the active material slurry needs to be dried by a drying device. During the drying process, the edge of the active material slurry dries quickly, resulting in the solid content of the edge of the active material slurry increasing faster than that of the middle part of the active material slurry. This makes the surface tension of the edge of the active material slurry greater than the surface tension of the middle part of the active material slurry, causing the active material slurry to flow to the edge of the active material slurry, and then the electrode will have a bulging edge phenomenon after drying.

[0045] Because the thickness of the electrode edge directly affects the gap between the positive and negative electrodes at the edge of the electrode assembly formed after winding or lamination, and is directly related to lithium deposition at the edge of the electrode assembly, how to control the morphology of the active material layer formed on the electrode during the coating process has always been a concern for those skilled in the art.

[0046] In some cases, the edges of the active material layer can be thinned by laser cleaning. However, the high temperature generated by the laser in this method will cause the active material to carbonize and decompose to varying degrees, causing problems such as powder loss due to insufficient bonding strength.

[0047] Some embodiments of the present application provide a pole piece coating system, which includes a coating machine, a drying device, a conveying device and a shaping mechanism, wherein the coating machine is used to coat the active material slurry on the first surface of the current collector; the drying device is used to dry the active material slurry; the conveying device is used to convey the current collector coated with the active material slurry to the drying device; the shaping mechanism is arranged between the coating machine and the drying device, and the shaping mechanism includes a vibrating head, the vibrating head is provided with a supporting surface, the supporting surface is used to fit the second surface of the current collector, and the second surface and the first surface are arranged relative to each other along the thickness direction of the current collector. ; The supporting surface includes a bonding area and a shaping area that are interconnected, and the bonding area and the shaping area are arranged along a first direction, and the first direction, the thickness direction of the current collector and the conveying direction of the current collector are perpendicular to each other; along the thickness direction of the current collector, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the bonding area, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the shaping area, and the orthographic projection of the edge of the active material slurry in the first direction is located within the orthographic projection range of the shaping area; the height of the shaping area is higher than the height of the bonding area, and the height of the shaping area tends to increase along the direction from the bonding area to the shaping area. In the above structure, since the height of the shaping area of ​​the supporting surface in the vibration head is higher than the height of the bonding area, and the height of the shaping area tends to increase in the direction from the bonding area to the shaping area, by making the positive projection of the edge of the active material slurry in the first direction along the thickness direction of the collector located within the positive projection range of the shaping area along the thickness direction of the collector, under the vibration action of the vibration head, the slurry at the edge of the active material slurry in the first direction will migrate inward, so that the thickness of the active material slurry at the edge in the first direction is thinned, thereby realizing the control of the morphology of the active material layer formed on the electrode, which is beneficial to reducing the possibility of bulging edge phenomenon of the electrode.

[0048] The electrode coating system disclosed in the embodiment of the present application can not only be used in the electrode coating process to control the morphology of the active material layer formed on the electrode, but can also be used to control the morphology of the composite material layer (film) made of paste polymer, molten polymer or polymer melt on paper, cloth, and plastic film.

[0049] The electrode coating system, electrode coating method and battery device production system provided in the embodiments of the present application will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0050] Some embodiments of the present application provide a pole piece coating system, referring to Figure 1 and Figure 2 The electrode coating system comprises a coating machine 1, a drying device 2, a conveying device 3 and a shaping mechanism 4. The coating machine 1 is used to coat the active material slurry 20 on the first surface of the current collector 10; the drying device 2 is used to dry the active material slurry 20; the conveying device 3 is used to convey the current collector 10 coated with the active material slurry 20 to the drying device 2; the shaping mechanism 4 is arranged between the coating machine 1 and the drying device 2, and the shaping mechanism 4 includes a vibration head 41, the vibration head 41 is provided with a supporting surface 411, the supporting surface 411 is used to adhere to the second surface of the current collector 10, and the second surface and the first surface are arranged oppositely along the thickness direction of the current collector 10; the supporting surface 411 includes a bonding area 4111 and a shaping area 4111 connected to each other. 112, the bonding area 4111 and the shaping area 4112 are arranged along the first direction X, and the first direction X, the thickness direction of the current collector 10, and the transport direction of the current collector 10 are perpendicular to each other; along the thickness direction of the current collector 10, the orthographic projection of part of the active material slurry 20 is located within the orthographic projection range of the bonding area 4111, the orthographic projection of part of the active material slurry 20 is located within the orthographic projection range of the shaping area 4112, and the orthographic projection of the edge of the active material slurry 20 in the first direction X is located within the orthographic projection range of the shaping area 4112; the height of the shaping area 4112 is higher than the height of the bonding area 4111, and the height of the shaping area 4112 tends to increase along the direction from the bonding area 4111 to the shaping area 4112.

[0051] The coater 1 may be a device for coating the active material slurry 20 on the first surface of the current collector 10. The active material slurry 20 is used to form an active material layer on the first surface of the current collector 10. The drying device 2 may be a device for drying the active material slurry 20. The active material slurry 20 coated on the first surface of the current collector 10 is dried by the drying device 2 and can adhere to the first surface of the current collector 10 to form an active material layer. The conveying device 3 may be a device for conveying the current collector 10 coated with the active material slurry 20 to the drying device 2. The conveying device 3 can continuously convey the current collector 10 coated with the active material slurry 20 after passing through the coater 1 to the drying device 2 to achieve production continuity.

[0052] The first surface and the second surface are two surfaces of the current collector 10 that are opposite to each other in the thickness direction, and the material forming the current collector 10 is located between the first surface and the second surface.

[0053] The shaping device may be a device for changing the morphology of the active material slurry 20 on the first surface of the current collector 10. The shaping device can thin the edge area of ​​the active material slurry 20 on the first surface of the current collector 10, so that the morphology of the active material layer formed on the electrode is controlled, which is conducive to reducing the possibility of bulging of the electrode.

[0054] The shaping mechanism 4 is disposed between the coating machine 1 and the drying device 2, which may mean that the shaping mechanism 4 is disposed upstream of the drying device 2 and acts on the current collector 10 coated with the active material slurry 20 that has not been dried by the drying device 2. The active material slurry 20 on the current collector 10 acted upon by the shaping mechanism 4 has a certain degree of fluidity because it has not been dried, and the substances therein can migrate.

[0055] The vibration head 41 can be a vibrating device in the shaping mechanism 4, which is used to contact the current collector 10 coated with the active material slurry 20 and transmit the vibration to the current collector 10 coated with the active material slurry 20, so as to cause the active material slurry 20 to migrate. Exemplarily, the shaping mechanism 4 may also include a vibration motor, and the vibration head 41 is transmission-connected to the output end of the vibration motor. The vibration head 41 can transmit the vibration generated by the vibration motor to the current collector 10 coated with the active material slurry 20.

[0056] The abutting surface 411 may be a portion of the outer surface of the vibration head 41. The abutting surface 411 is used to contact the current collector 10 coated with the active material slurry 20. The abutting surface 411 is used to adhere to the second surface of the current collector 10 to transmit vibrations to the active material slurry 20 of the current collector 10. By adhering the abutting surface 411 to the second surface of the current collector 10 rather than other surfaces of the current collector 10 (such as the first surface), the possibility of the abutting surface 411 directly contacting the active material slurry 20 can be reduced, which helps to keep the abutting surface 411 clean.

[0057] For example, the abutting surface 411 may be a smooth surface, which can reduce damage to the current collector 10 when in contact with the current collector 10 and reduce the possibility of marks on the current collector 10 .

[0058] The bonding area 4111 and the shaping area 4112 are two parts of the surface of the supporting surface 411. The bonding area 4111 and the shaping area 4112 are arranged along the first direction X. The first direction X can be a direction perpendicular to both the thickness direction of the current collector 10 and the conveying direction of the current collector 10. By arranging the bonding area 4111 and the shaping area 4112 along the first direction X, the shaping area 4112 can extend to the edge of the active material slurry 20 in the first direction X, so that the shaping area 4112 can act on the edge of the active material slurry 20 in the first direction X.

[0059] By positioning the orthographic projection of part of the active material slurry 20 along the thickness direction of the current collector 10 within the orthographic projection range of the bonding area 4111 along the thickness direction of the current collector 10, the bonding area 4111 can act on part of the active material slurry 20, causing the part of the active material slurry 20 to vibrate and have migration properties.

[0060] By positioning the orthographic projection of a portion of the active material slurry 20 along the thickness direction of the current collector 10 within the orthographic projection range of the shaping area 4112 along the thickness direction of the current collector 10 , the shaping area 4112 can act on a portion of the active material slurry 20 , causing the portion of the active material slurry 20 to vibrate and have migration properties.

[0061] By locating the orthographic projection of the edge of the active material slurry 20 in the first direction X along the thickness direction of the current collector 10 within the range of the orthographic projection of the shaping zone 4112 along the thickness direction of the current collector 10, the material at the edge of the active material slurry 20 in the first direction X can be located within the range of action of the shaping zone 4112.

[0062] The height of the shaping area 4112 is higher than the height of the bonding area 4111 , which may mean that the height of the entire shaping area 4112 is higher than the height of the entire bonding area 4111 . Along the direction from the bonding area 4111 to the shaping area 4112, the height of the shaping area 4112 tends to increase, which may mean that the height of the shaping area 4112 tends to increase continuously along the direction from the bonding area 4111 to the shaping area 4112, so that when the supporting surface 411 is attached to the second surface of the current collector 10, the supporting surface 411 can make the height of the active material slurry 20 on the current collector 10 tend to decrease from the edge of the first direction X along the direction from the shaping area 4112 to the bonding area 4111. When the material at the edge of the active material slurry 20 in the first direction X has migration properties, it can migrate along the direction from the shaping area 4112 to the bonding area 4111 under the action of gravity, so that the material at the edge of the active material slurry 20 in the first direction X migrates to the interior of the active material slurry 20, so as to achieve a reduction in the material at the edge of the active material slurry 20 in the first direction X, so that the thickness of the active material slurry 20 at the edge of the first direction X is thinned.

[0063] In the above structure, since the height of the shaping area 4112 of the supporting surface 411 in the vibration head 41 is higher than the height of the bonding area 4111, and the height of the shaping area 4112 tends to increase in the direction from the bonding area 4111 to the shaping area 4112, by making the positive projection of the edge of the active material slurry 20 in the first direction X along the thickness direction of the current collector 10 located within the positive projection range of the shaping area 4112 along the thickness direction of the current collector 10, under the vibration action of the vibration head 41, the slurry at the edge of the active material slurry 20 in the first direction X will migrate inward, so that the thickness of the active material slurry 20 at the edge of the first direction X is thinned, thereby realizing the control of the morphology of the active material layer formed on the electrode, which is beneficial to reducing the possibility of bulging of the electrode.

[0064] Exemplarily, the bonding area 4111 is set as a horizontal plane, so that the active material slurry 20 at the edge in the first direction X can migrate inward more smoothly.

[0065] In some embodiments, the shaping mechanism 4 further includes a heater 42 . The heater 42 is located on a side of the active material slurry 20 away from the current collector 10 . The heater 42 and the vibration head 41 are disposed opposite to each other along the thickness direction of the current collector 10 .

[0066] The heater 42 may be a device in the shaping mechanism 4 for heating the active material slurry 20 located on the first surface of the current collector 10. The heater 42 heats the active material slurry 20 located on the first surface of the current collector 10 to increase the temperature of the active material slurry 20, which helps to reduce the viscosity of the active material slurry 20, so that the active material slurry 20 located on the first surface of the current collector 10 has better migration performance, so that the active material slurry 20 at the edge of the first direction X can flow more smoothly into the interior of the active material slurry 20, which helps to improve the thinning effect of the vibrating head 41 on the edge of the active material slurry 20 in the first direction X.

[0067] The heater 42 is located on the side of the active material slurry 20 away from the current collector 10, which may mean that the heater 42 is arranged relative to the active material slurry 20 and is located on the side of the active material slurry 20 away from the current collector 10, so that the heater 42 does not contact the active material slurry 20, reducing the possibility of affecting the active material layer formed by the active material slurry 20.

[0068] The heater 42 and the vibrating head 41 are disposed relative to each other along the thickness direction of the current collector 10. This may mean that the heater 42 and the vibrating head 41 are spaced relative to each other along the thickness direction of the current collector 10, and the current collector 10 passes through the gap between the heater 42 and the vibrating head 41. By arranging the heater 42 and the vibrating head 41 relative to each other along the thickness direction of the current collector 10, while the vibrating head 41 acts on the current collector 10, the heater 42 also heats the active material slurry 20 on the current collector 10, thereby reducing the viscosity of the active material slurry 20 and improving the migration performance.

[0069] In some embodiments, the shaping mechanism 4 further includes a heater 42 . The heater 42 is located on a side of the active material slurry 20 away from the current collector 10 . In the conveying direction of the current collector 10 , the heater 42 is closer to the coater 1 than the vibration head 41 .

[0070] In the conveying direction of the current collector 10, the heater 42 is closer to the coater 1 than the vibration head 41, which may mean that the position of the heater 42 in the conveying direction of the current collector 10 is closer to the coater 1 than the position of the vibration head 41 in the conveying direction of the current collector 10, so that the heater 42 is located upstream of the vibration head 41, so that after the heater 42 heats the active material slurry 20 on the current collector 10, the active material slurry 20 on the current collector 10 will be transported to the vibration head 41. At this time, the temperature of the active material slurry 20 on the current collector 10 at the vibration head 41 has been increased, and the viscosity of the active material slurry 20 has been reduced, with better migration performance.

[0071] In some embodiments, reference Figure 3 and Figure 4 The vibration head 41 is provided with a heat dissipation structure 412, and the heat dissipation structure 412 includes heat dissipation holes or heat dissipation fins.

[0072] The heat dissipation structure 412 may be a structure provided on the vibration head 41 for dissipating heat. Since the vibration head 41 is affected by the vibration energy, its temperature will rise. By providing the heat dissipation structure 412 on the vibration head 41, the temperature of the vibration head 41 is prevented from being too high, thereby reducing the possibility of the vibration head 41 scalding the current collector 10.

[0073] The heat dissipation hole can be a hole-shaped structure provided on the vibration head 41 , which is connected to the outside world so that the outside air can flow into the inside of the vibration head 41 , taking away the heat inside the vibration head 41 , which is helpful to reduce the temperature of the vibration head 41 .

[0074] The heat sink may be a sheet-like structure for heat dissipation. By disposing the heat sink on the vibration head 41 , the heat on the vibration head 41 can be quickly dissipated outwards through the heat sink, which is conducive to reducing the temperature of the vibration head 41 .

[0075] Exemplarily, the heat sink may be a copper heat sink, so that the heat sink has a higher heat dissipation efficiency.

[0076] In some embodiments, the vibration frequency of the vibration head 41 is set to D, 20 kHz≤D≤50 kHz, and the amplitude of the vibration head 41 is set to E, 8 μm≤E≤30 μm.

[0077] By setting the range of the vibration frequency D of the vibration head 41 to 20kHz≤D≤50kHz, the sound generated by the vibration of the vibration head 41 can be in the ultrasonic range and is not easily detected by the human ear, which is beneficial to improving the working environment of the staff. It also makes the vibration frequency of the vibration head 41 easier to be obtained by the vibration motor, which is beneficial to controlling costs.

[0078] The vibration frequency D of the vibration head 41 can be set to a range of 25kHz≤D≤45kHz. For example, the vibration frequency D of the vibration head 41 can be set to 25kHz, 30kHz, 35kHz, 40kHz or 45kHz, so that the sound generated by the vibration of the vibration head 41 is not easily detected by the human ear, and the cost of the electrode coating system can be reduced.

[0079] By setting the amplitude E of the vibration head 41 to be within the range of 8 μm≦E≦30 μm, the vibration of the vibration head 41 can not only improve the migration performance of the active material slurry 20 but also less likely to damage the current collector 10 .

[0080] The amplitude E of the vibration head 41 can be set to a range of 10μm≤E≤25μm. For example, the amplitude E of the vibration head 41 can be set to 10μm, 15μm, 20μm or 25μm, so that the vibration of the vibration head 41 can improve the migration performance of the active material slurry 20 while not easily damaging the current collector 10.

[0081] In some embodiments, reference Figure 5 A cooling channel 413 is provided in the vibration head 41, and the cooling channel 413 is used to pass cooling liquid.

[0082] The cooling channel 413 can be a channel structure set in the vibration head 41, which is used to circulate the coolant so that the heat in the vibration head 41 can be taken away by the coolant, so that the temperature of the vibration head 41 can be controlled within an appropriate range, and the temperature of the vibration head 41 is not easy to be too high, thereby reducing the possibility of the vibration head 41 scalding the collector 10.

[0083] In some embodiments, the shaping area 4112 has a first straight line extending along the conveying direction of the current collector 10, a second straight line extending along the conveying direction of the current collector 10, a third straight line extending along the conveying direction of the current collector 10, and a fourth straight line extending along the conveying direction of the current collector 10. The first straight line, the second straight line, the third straight line, and the fourth straight line are all located on the side of the edge of the active material slurry 20 in the first direction X close to the bonding area 4111; along the first direction X, the distance between the first straight line and the edge of the active material slurry 20 in the first direction X is set to E, the distance between the second straight line and the edge of the active material slurry 20 in the first direction X is set to F, and the distance between the third straight line and the active material slurry 20 in the first direction X is set to F. The distance from the edge of the material slurry 20 in the first direction X is set to G, and the distance from the fourth straight line to the edge of the active material slurry 20 in the first direction X is set to H; in the vertical direction, the height of the first straight line from the fitting area 4111 is set to I, the height of the second straight line from the fitting area 4111 is set to J, the height of the third straight line from the fitting area 4111 is set to K, and the height of the fourth straight line from the fitting area 4111 is set to L, E=2mm, F=2mm, G=2mm, H=2mm, 1.3mm≤I≤1.5mm, 0.8mm≤J≤1.2mm, 0.5mm≤K≤0.7mm, 0.1mm≤L≤0.4mm.

[0084] The first straight line, the second straight line, the third straight line, and the fourth straight line are straight lines on the shaping area 4112, and all extend along the transport direction of the current collector 10. The first straight line, the second straight line, the third straight line, and the fourth straight line are used to limit the morphology of the bonding area 4111 so that the active material slurry 20 on the corresponding current collector 10 can migrate more smoothly.

[0085] The first straight line, the second straight line, the third straight line and the fourth straight line are all located on the side of the edge of the active material slurry 20 in the first direction X close to the bonding area 4111, which may mean that the portion of the shaping area 4112 where the first straight line, the second straight line, the third straight line and the fourth straight line are located is located on the side of the edge of the active material slurry 20 in the first direction X close to the bonding area 4111.

[0086] Among them, the distance between the first straight line and the edge of the active material slurry 20 in the first direction X is E, the distance between the second straight line and the edge of the active material slurry 20 in the first direction X is F, the distance between the third straight line and the edge of the active material slurry 20 in the first direction X is G, and the distance between the fourth straight line and the edge of the active material slurry 20 in the first direction X is H, E=2 mm, F=2 mm, G=2 mm, H=2 mm. By setting the height of the first straight line from the bonding area 4111 in the vertical direction to I, the height of the second straight line from the bonding area 4111 in the vertical direction to J, the height of the third straight line from the bonding area 4111 in the vertical direction to K, and the height of the fourth straight line from the bonding area 4111 in the vertical direction to L, and making 1.3mm≤I≤1.5mm, 0.8mm≤J≤1.2mm, 0.5mm≤K≤0.7mm, 0.1mm≤L≤0.4mm, when the shaping area 4112 where the first straight line, the second straight line, the third straight line and the fourth straight line are located acts on the current collector 10, the active material slurry 20 on the current collector 10 encounters less resistance during migration and migrates more smoothly.

[0087] In some embodiments, the supporting surface 411 further includes a transition area 4113 , which connects the fitting area 4111 and the shaping area 4112 , and the transition area 4113 is configured as an arc-shaped surface.

[0088] The transition region 4113 may be a portion of the surface of the abutting surface 411 that connects the fitting region 4111 and the shaping region 4112. By configuring the transition region 4113 as an arcuate surface, a smooth transition can be achieved between the fitting region 4111 and the shaping region 4112, making it less likely for abrupt height changes to occur on the abutting surface 411. This helps reduce damage to the current collector 10 when the abutting surface 411 contacts the current collector 10, and reduces the possibility of marks on the current collector 10.

[0089] In some embodiments, the conveying device 3 includes at least two conveying rollers 31 . The at least two conveying rollers 31 are arranged in parallel and spaced apart and located between the coater 1 and the drying device 2 . The vibration head 41 is arranged between two adjacent conveying rollers 31 .

[0090] The conveying roller 31 may be a roller in the conveying device 3 for carrying the load of the current collector 10 coated with the active material slurry 20 , and may contact the second surface of the current collector 10 to drive the current collector 10 to move toward the drying device 2 .

[0091] The conveying device 3 is provided with at least two conveying rollers 31 spaced apart from each other, so that a space for arranging the vibration head 41 can be formed between the conveying rollers 31 .

[0092] By arranging at least two conveying rollers 31 in parallel and at intervals, the current collector 10 between two adjacent conveying rollers 31 is in a horizontal state, which helps to reduce the possibility of the active material slurry 20 on the current collector 10 migrating due to the tilt of the current collector 10.

[0093] Some embodiments of the present application also provide a battery device production system, which includes the electrode coating system provided by any of the above technical solutions.

[0094] Some embodiments of the present application also provide a pole piece coating method, referring to Figure 6 , the pole piece coating method comprises:

[0095] S1. Provide a coating machine 1, a drying device 2, a conveying device 3 and a shaping mechanism 4. The shaping mechanism 4 is arranged between the coating machine 1 and the drying device 2. The shaping mechanism 4 includes a vibrating head 41. The vibrating head 41 is provided with a supporting surface 411. The supporting surface 411 includes a bonding area 4111 and a shaping area 4112 connected to each other. The bonding area 4111 and the shaping area 4112 are arranged along a first direction X. The height of the shaping area 4112 is higher than the height of the bonding area 4111. The height of the shaping area 4112 tends to increase along the direction from the bonding area 4111 to the shaping area 4112.

[0096] As described in the above technical solution, the coating machine 1 , the drying device 2 , the conveying device 3 and the shaping mechanism 4 are devices in the electrode coating system, which are used to coat the current collector 10 to obtain an active material layer on the current collector 10 .

[0097] S2 : Use the coating machine 1 to apply the active material slurry 20 to the first surface of the current collector 10 .

[0098] In step S2 , the active material slurry 20 is coated on the first surface of the current collector 10 by using the coating machine 1 , so that the active material slurry 20 can form an active material layer on the first surface of the current collector 10 .

[0099] S3 . The current collector 10 coated with the active material slurry 20 is transported to the drying device 2 by the transport device 3 . The transport direction of the current collector 10 , the first direction X, and the thickness direction of the current collector 10 are perpendicular to each other.

[0100] In step S3 , the current collector 10 coated with the active material slurry 20 is transported to the drying device 2 by the transporting device 3 , so that the active material slurry 20 coated on the current collector 10 can be dried by the drying device 2 to form an active material layer.

[0101] S4. The supporting surface 411 is attached to the second surface of the current collector 10, and the second surface and the first surface are arranged opposite to each other along the thickness direction of the current collector 10; along the thickness direction of the current collector 10, the orthographic projection of part of the active material slurry 20 is located within the orthographic projection range of the bonding area 4111, the orthographic projection of part of the active material slurry 20 is located within the orthographic projection range of the shaping area 4112, and the orthographic projection of the edge of the active material slurry 20 in the first direction X is located within the orthographic projection range of the shaping area 4112.

[0102] As in the aforementioned technical solution, in the above-mentioned step S4, the abutting surface 411 of the vibration head 41 transmits the vibration to the current collector 10, so that the material at the edge of the active material slurry 20 in the first direction X can migrate along the direction from the shaping area 4112 to the bonding area 4111 under the action of gravity, so that the material at the edge of the active material slurry 20 in the first direction X migrates toward the interior of the active material slurry 20, thereby achieving a reduction in the material at the edge of the active material slurry 20 in the first direction X, and reducing the thickness of the active material slurry 20 at the edge of the first direction X, thereby achieving control over the morphology of the active material layer formed on the electrode, which is beneficial to reducing the possibility of bulging of the electrode.

[0103] In some embodiments, the shaping mechanism 4 further includes a heater 42. Before step S4, the electrode coating method further includes:

[0104] S31 : Heat the active material slurry 20 on the first surface using the heater 42 .

[0105] As in the aforementioned technical solution, in step S31, after the active material slurry 20 on the current collector 10 is heated by the heater 42, the vibration head 41 acts on the current collector 10 again. At this time, the temperature of the active material slurry 20 on the current collector 10 at the vibration head 41 has been increased, and the viscosity of the active material slurry 20 has been reduced, with better migration performance.

[0106] In some embodiments, the temperature of the active material slurry 20 after heating is M, and 45° C. ≤ M ≤ 70° C.

[0107] By heating the active material slurry 20, the temperature M of the active material slurry 20 reaches the range of 45°C≤M≤70°C, which not only effectively reduces the viscosity of the active material slurry 20 and effectively improves the migration performance of the active material slurry 20, but also prevents the temperature of the active material slurry 20 from being too high, causing premature loss of water.

[0108] The temperature M of the active material slurry 20 is within the range of 50° C. ≤ M ≤ 60° C. For example, the temperature M of the active material slurry 20 can be set to 50° C., 55° C., or 60° C., so that the migration performance of the active material slurry 20 is effectively improved while the temperature is not too high.

[0109] Some embodiments of the present application provide a pole piece coating system, which includes a coater 1, a drying device 2, a conveying device 3 and a shaping mechanism 4, wherein the coater 1 is used to coat the active material slurry 20 on the first surface of the current collector 10; the drying device 2 is used to dry the active material slurry 20; the conveying device 3 is used to convey the current collector 10 coated with the active material slurry 20 to the drying device 2; the shaping mechanism 4 is arranged between the coater 1 and the drying device 2, and the shaping mechanism 4 includes a vibration head 41 and a heater 42, the vibration head 41 and the heater 42 are respectively located on both sides of the current collector 10, and in the conveying direction of the current collector 10, the heater 42 is closer to the coater 1 than the vibration head 41. The vibration head 41 is provided with a supporting surface 411, and the supporting surface 411 is used to adhere to the second surface of the current collector 10, and the second surface and the first surface are arranged relative to each other along the thickness direction of the current collector 10. The abutting surface 411 includes an interconnected bonding area 4111 and a shaping area 4112. The bonding area 4111 and the shaping area 4112 are arranged along a first direction X. The first direction X, the thickness direction of the current collector 10, and the transport direction of the current collector 10 are mutually perpendicular. Along the thickness direction of the current collector 10, the orthographic projection of a portion of the active material slurry 20 is located within the orthographic projection range of the bonding area 4111, the orthographic projection of a portion of the active material slurry 20 is located within the orthographic projection range of the shaping area 4112, and the orthographic projection of the edge of the active material slurry 20 in the first direction X is located within the orthographic projection range of the shaping area 4112. The height of the shaping area 4112 is higher than that of the bonding area 4111, and the height of the shaping area 4112 increases along the direction from the bonding area 4111 to the shaping area 4112.

[0110] In the above structure, since the height of the shaping area 4112 of the supporting surface 411 in the vibration head 41 is higher than the height of the bonding area 4111, and the height of the shaping area 4112 tends to increase in the direction from the bonding area 4111 to the shaping area 4112, by making the positive projection of the edge of the active material slurry 20 in the first direction X along the thickness direction of the current collector 10 located within the positive projection range of the shaping area 4112 along the thickness direction of the current collector 10, under the vibration action of the vibration head 41, the slurry at the edge of the active material slurry 20 in the first direction X will migrate inward, so that the thickness of the active material slurry 20 at the edge of the first direction X is thinned, thereby realizing the control of the morphology of the active material layer formed on the electrode, which is beneficial to reducing the possibility of bulging of the electrode.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pole piece coating system, characterized in that: include: a coating machine for coating the active material slurry on the first surface of the current collector; a drying device for drying the active material slurry; a conveying device, configured to convey the current collector coated with the active material slurry to the drying device; a shaping mechanism disposed between the coater and the drying device, the shaping mechanism comprising a vibrating head, the vibrating head being provided with a supporting surface, the supporting surface being adapted to adhere to the second surface of the current collector, the second surface and the first surface being arranged opposite to each other along the thickness direction of the current collector; the supporting surface comprising a bonding area and a shaping area connected to each other, the bonding area and the shaping area being arranged along a first direction, the first direction, the thickness direction of the current collector, and the conveying direction of the current collector being perpendicular to each other; Along the thickness direction of the current collector, part of the active material slurry's orthographic projection is located within the orthographic projection range of the bonding area, part of the active material slurry's orthographic projection is located within the orthographic projection range of the shaping area, and the orthographic projection of the edge of the active material slurry in the first direction is located within the orthographic projection range of the shaping area; the height of the shaping area is higher than the height of the bonding area, and along the direction from the bonding area to the shaping area, the height of the shaping area tends to increase.

2. The electrode coating system according to claim 1, characterized in that: The shaping mechanism further includes a heater, which is located on a side of the active material slurry away from the current collector, and the heater and the vibration head are arranged opposite to each other along the thickness direction of the current collector.

3. The electrode coating system according to claim 1, characterized in that: The shaping mechanism further includes a heater, which is located on a side of the active material slurry away from the current collector. In the conveying direction of the current collector, the heater is closer to the coater than the vibration head.

4. The electrode coating system according to claim 1, characterized in that: The vibration head is provided with a heat dissipation structure, and the heat dissipation structure includes heat dissipation holes or heat dissipation fins.

5. The electrode coating system according to claim 1, characterized in that: The vibration frequency of the vibration head is set to D, 20kHz≤D≤50kHz, and the amplitude of the vibration head is set to E, 8μm≤E≤30μm.

6. The electrode coating system according to claim 1, characterized in that: A cooling channel is provided in the vibration head, and the cooling channel is used to allow cooling liquid to flow into the cooling channel.

7. The electrode coating system according to claim 1, characterized in that: The shaping area has a first straight line extending along the conveying direction of the current collector, a second straight line extending along the conveying direction of the current collector, a third straight line extending along the conveying direction of the current collector, and a fourth straight line extending along the conveying direction of the current collector. The first straight line, the second straight line, the third straight line, and the fourth straight line are all located on a side of the edge of the active material slurry in the first direction close to the bonding area; along the first direction, the distance between the first straight line and the edge of the active material slurry in the first direction is set to E, the distance between the second straight line and the edge of the active material slurry in the first direction is set to F, and the distance between the third straight line and the edge of the active material slurry in the first direction is set to F. The distance between the edge of the active material slurry in the first direction is set to G, and the distance between the fourth straight line and the edge of the active material slurry in the first direction is set to H; in the vertical direction, the height of the first straight line from the fitting area is set to I, the height of the second straight line from the fitting area is set to J, the height of the third straight line from the fitting area is set to K, and the height of the fourth straight line from the fitting area is set to L, E=2mm, F=2mm, G=2mm, H=2mm, 1.3mm≤I≤1.5mm, 0.8mm≤J≤1.2mm, 0.5mm≤K≤0.7mm, 0.1mm≤L≤0.4mm.

8. The electrode coating system according to claim 1, characterized in that: The supporting surface further includes a transition area, which connects the fitting area and the shaping area, and the transition area is configured as an arc surface.

9. The electrode coating system according to claim 1, characterized in that: The conveying device includes at least two conveying rollers, which are arranged in parallel and spaced apart and located between the coater and the drying device, and the vibration head is arranged between two adjacent conveying rollers.

10. A battery device production system, characterized in that: Comprising a pole piece coating system as described in any one of claims 1 to 9.

11. A pole piece coating method, characterized in that: include: A coating machine, a drying device, a conveying device, and a shaping mechanism are provided. The shaping mechanism is disposed between the coating machine and the drying device. The shaping mechanism includes a vibrating head, the vibrating head is provided with a supporting surface, the supporting surface includes a bonding area and a shaping area connected to each other, the bonding area and the shaping area are arranged along a first direction, the height of the shaping area is higher than the height of the bonding area, and the height of the shaping area tends to increase along a direction from the bonding area to the shaping area. Using the coating machine to apply the active material slurry to the first surface of the current collector; The conveying device is used to convey the current collector coated with the active material slurry to the drying device, wherein the conveying direction of the current collector, the first direction, and the thickness direction of the current collector are perpendicular to each other; The abutting surface is adhered to the second surface of the current collector, and the second surface and the first surface are arranged opposite to each other along the thickness direction of the current collector; along the thickness direction of the current collector, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the bonding area, the orthographic projection of part of the active material slurry is located within the orthographic projection range of the shaping area, and the orthographic projection of the edge of the active material slurry in the first direction is located within the orthographic projection range of the shaping area.

12. The electrode coating method according to claim 11, characterized in that: The shaping mechanism further includes a heater. Before the abutting surface is brought into contact with the second surface of the current collector, the electrode coating method further includes: The active material slurry on the first surface is heated by the heater.

13. The electrode coating method according to claim 12, characterized in that: The temperature of the active material slurry after heating is M, 45°C≤M≤70°C.

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