Slit coating device

Abstract

The utility model discloses a slit coating device which comprises a coating platform, a pre-coating component and a coating assembly, the coating platform is provided with a coating working area and a pre-coating area, the coating working area is used for containing a to-be-coated component, the pre-coating area is located on the side, in the coating direction, of the coating working area, the pre-coating component is placed in the pre-coating area, and the pre-coating component is placed in the pre-coating area. The pre-coating part is constructed to be made of the same or similar material as the to-be-coated part, the pre-coating part is provided with a pre-coating surface, the pre-coating surface is flush with the coating surface of the to-be-coated part, the coating assembly is arranged above the coating platform, and the coating assembly and the coating platform can move relatively in the coating direction; the coating assembly is used for coating the pre-coating surface and the coating surface. According to the slit coating device, as the material of the pre-coating component is the same as or similar to that of the to-be-coated component, the adhesive forces of the pre-coating component and the to-be-coated component to the coating liquid are similar, so that when the coating liquid passes through the junction of the pre-coating component and the to-be-coated component, liquid accumulation or liquid shortage caused by inconsistent adhesive forces can be avoided, and the uniformity and quality of a coating film are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and particularly to a slot coating device. Background Art

[0002] A perovskite solar cell is a solar cell that uses a perovskite-type organometallic halide semiconductor as a light-absorbing material, and has advantages such as higher efficiency, lower cost, better flexibility and transparency. In the preparation process of a perovskite battery, a perovskite coating liquid needs to be coated on a substrate to form a perovskite thin film, so as to collect solar energy and convert it into electric energy. In related technologies, a slot coating technology is mostly used to coat the perovskite coating liquid on the substrate. The slot coating technology stores a precursor liquid in a liquid storage pump, and continuously extrudes it from a slot coating head onto the substrate uniformly according to set parameters through a control system to form a continuous and uniform liquid film, so as to improve the surface function of the substrate, protect the substrate or directly utilize the surface characteristics of the coating liquid layer to improve the product value. This slot coating technology has characteristics such as fast coating speed, good coating film uniformity, and wide coating window. However, currently, after slot coating, there will be problems of coating liquid accumulation or liquid shortage at the front and rear ends of the substrate, resulting in uneven coating of the coating liquid and affecting the quality of the perovskite thin film and the battery performance. Summary of the Utility Model

[0003] Embodiments of the present application disclose a slot coating device, which can prevent the problem of uneven coating caused by liquid accumulation or liquid shortage at the front and rear ends of the substrate after slot coating, and can improve the quality of the coating thin film, which is beneficial to improving the performance of the battery.

[0004] In order to achieve the above object, embodiments of the present application disclose a slot coating device, including:

[0005] A coating platform, the coating platform is provided with a coating working area and a pre-coating area, the coating working area is configured to place a component to be coated, and the pre-coating area is located on one side of the coating working area along the coating direction;

[0006] A pre-coating component, the pre-coating component is placed in the pre-coating area, the contact angle between the pre-coating component and the coating liquid is a first contact angle, the contact angle between the component to be coated and the coating liquid is a second contact angle, the difference between the first contact angle and the second contact angle is within 15°, the pre-coating component has a pre-coating surface, and the pre-coating surface is configured to be flush with the coating surface of the component to be coated; and

[0007] A coating assembly, the coating assembly is arranged above the coating platform, along the coating direction, the coating assembly and the coating platform can move relative to each other, and the coating assembly is configured to coat the pre-coating surface and the coating surface.

[0008] As an alternative implementation, the pre-coated component and the component to be coated are made of the same material; or,

[0009] The pre-coated component includes a semiconductor material.

[0010] As an alternative implementation, on both sides of the coating working area along the coating direction, there are provided the pre-coating areas, and each of the pre-coating areas is provided with the pre-coated component; or,

[0011] The pre-coating areas are arranged around the coating working area, so that the pre-coated components are arranged around the outer periphery of the component to be coated.

[0012] As an alternative implementation, the pre-coated component and the component to be coated are in contact with each other along the coating direction.

[0013] As an alternative implementation, the pre-coated component is movably arranged in the pre-coating area, and the pre-coated component can move relative to the component to be coated along the coating direction to adjust the distance between the pre-coated component and the component to be coated.

[0014] As an alternative implementation, the slot coating device further includes a fixing member. The coating platform is provided with a through hole along the coating direction, the fixing member passes through the through hole, and the fixing member is connected to the pre-coated component. The fixing member is configured to maintain the position of the pre-coated component during movement in the coating direction.

[0015] As an alternative implementation, the coating platform is provided with a groove, and the groove forms the coating working area and the pre-coating area.

[0016] As an alternative implementation, the groove includes a first sub-groove and a second sub-groove. The first sub-groove communicates with the second sub-groove, and the depth of the second sub-groove is greater than the depth of the first sub-groove. The first sub-groove forms the coating working area, and the second sub-groove forms the pre-coating area.

[0017] As an alternative implementation, there are multiple coating working areas, and the multiple coating working areas are arranged in sequence along the coating direction; or,

[0018] The multiple coating working areas are arranged in sequence perpendicular to the coating direction;

[0019] There are multiple pre-coating areas, and at least one pre-coating area corresponds to each coating working area.

[0020] As an alternative embodiment, the coating assembly includes a liquid supply system and a coating die. The liquid infusion end of the liquid supply system is connected to the coating die. The liquid supply system is configured to convey coating liquid to the coating die. A slit is provided on one side of the coating die close to the component to be coated, and the slit is used to extrude the coating liquid for coating on the surface of the component to be coated.

[0021] Compared with the prior art, the beneficial effects of the present application are as follows:

[0022] In the slit coating device provided by the embodiment of the present application, a pre-coating area is arranged along the coating direction in the coating working area. The component to be coated is placed in the coating working area, and the pre-coating component is placed in the pre-coating area. By setting the difference between the first contact angle and the second contact angle within 15°, the pre-coating component is configured to have the same or similar material as that of the component to be coated. The pre-coated surface of the pre-coating component is flush with the coating surface of the component to be coated. The coating assembly is arranged above the coating platform and is relatively movable along the coating direction with respect to the coating platform. In this way, during the coating operation, the coating platform approaches the coating assembly along the coating direction, and the coating liquid is sequentially coated on the pre-coated surface and the coating surface of the component to be coated through the coating assembly. Since the material of the pre-coating component is the same or similar to that of the component to be coated, the adhesion force of the pre-coating component to the coating liquid is similar to that of the component to be coated. Therefore, when the coating liquid passes through the junction of the pre-coating component and the component to be coated, the situation of liquid accumulation or liquid shortage will not occur due to inconsistent adhesion forces, and thus a uniform coating can be formed on the surface of the component to be coated, which is beneficial to improving the quality of the coating film. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic cross-sectional structure diagram of the slit coating device disclosed in the embodiment of the present application;

[0025] Figure 2 It is a schematic projection (omitting the coating assembly) structure diagram of the slit coating device disclosed in the embodiment of the present application;

[0026] Figure 3 It is a schematic cross-sectional (omitting the pre-coating component and the coating assembly) structure diagram of the slit coating device disclosed in the embodiment of the present application.

[0027] Description of the Reference Numerals:

[0028] 100 - Slot coating device; 1 - Coating platform; 1a - Coating working area; 1b - Pre - coating area; 11 - Through - hole; 12 - Groove; 121 - First sub - groove; 122 - Second sub - groove; 2 - Pre - coating component; 3 - Coating assembly; 31 - Liquid supply system; 32 - Coating die; 4 - Fixing part; P - Pre - coated surface; X - Coating direction; 200 - Component to be coated. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] In the present application, the orientation or positional relationship indicated by terms such as "upper", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0031] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above - mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

[0032] In addition, the terms "arranged", "provided with", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present application can be understood according to specific situations.

[0033] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] Perovskite solar cells have broad application prospects in the photovoltaic field due to their excellent optoelectronic properties, simple preparation process, and abundant raw material sources. During the preparation of perovskite cells, it is necessary to form a perovskite layer on a substrate to collect solar energy and convert it into electrical energy. In related technologies, solution coating method and vacuum coating method are the two mainstream preparation processes for perovskite layers. Among them, the solution coating method has high raw material utilization rate, high speed, low cost, and high equipment compatibility, making it an ideal preparation process choice. The solution coating method mainly includes blade coating, spray coating, inkjet coating, and slot coating. Comparatively, slot coating is more conducive to controlling the uniformity of large-area preparation of perovskite layers and is the mainstream perovskite mass production coating process.

[0035] During the slot coating process, the coating liquid is first injected into the liquid storage and distribution cavity of the slot coating die through the liquid injection system. When the coating machine starts, the coating platform will move the substrate (i.e., the component to be coated) towards the coating die. The coating liquid flows out through the gap of the coating die. At the same time, the coating liquid will also be continuously injected into the coating die through the liquid injection system. As the coating platform moves towards the coating die, the coating liquid is evenly smeared on the substrate until the coating ends at the set position. However, since the coating die and the metal tabletop are separate, in the area where the substrate first receives coating, there will be defects such as the perovskite thin film not being fully coated or being unevenly coated.

[0036] To solve the above problems, the inventor tried to set the starting point of coating at a part beyond the front end of the substrate and start coating from the metal tabletop. In this way, the coating die can form a stable liquid bridge on the metal tabletop before starting to coat the substrate, so that the substrate can be fully coated when coating the substrate. To make the coating liquid fully cover the substrate, the ending point of coating is also selected to be set at a part beyond the tail end of the substrate. However, the inventor found through research that although this pre-coating method solves the problem of the perovskite thin film not being fully coated to a certain extent, after slot coating, due to the different materials of the tabletop and the substrate, the adhesion forces of the two to the coating liquid are different. When the coating liquid passes through the junction of the two, the coating liquid is prone to form accumulated liquid or lack of liquid at the front and rear ends of the substrate, resulting in uneven coating of the coating liquid and affecting the quality of the perovskite thin film and the battery performance.

[0037] In view of this, the embodiment of the present application provides a slot coating device, which can prevent the coating liquid from forming accumulated liquid or lack of liquid due to inconsistent adhesion forces when passing through the junction of the tabletop and the substrate. That is to say, the slot coating device of the present application can form a uniform coating on the surface of the component to be coated, which is beneficial to improving the quality of the coating thin film.

[0038] The technical solution of the present application will be further described below through specific embodiments and drawings.

[0039] Please refer to Figures 1 to 3 ,Figure 1 It is a schematic cross-sectional structure diagram of the slot coating device disclosed in the embodiments of the present application; Figure 2 It is a schematic projection (omitting the coating assembly) structure diagram of the slot coating device disclosed in the embodiments of the present application; Figure 3 It is a schematic cross-sectional (omitting the pre-coating component and the coating assembly) structure diagram of the slot coating device disclosed in the embodiments of the present application. The embodiments of the present application disclose a slot coating device. The slot coating device 100 includes a coating platform 1, a pre-coating component 2, and a coating assembly 3. The coating platform 1 is provided with a coating working area 1a and a pre-coating area 1b. The coating working area 1a is configured to place the component to be coated 200. The pre-coating area 1b is located on one side of the coating working area 1a along the coating direction X. The pre-coating component 2 is placed in the pre-coating area 1b. The contact angle between the pre-coating component 2 and the coating liquid is the first contact angle, and the contact angle between the component to be coated 200 and the coating liquid is the second contact angle. The difference between the first contact angle and the second contact angle is within 15°. The pre-coating component 2 has a pre-coated surface P, and the pre-coated surface P is configured to be flush with the coating surface of the component to be coated 200. The coating assembly 3 is arranged above the coating platform 1. Along the coating direction, the coating assembly 3 and the coating platform 1 can move relative to each other. The coating assembly 3 is configured to coat the pre-coated surface P and the coating surface.

[0040] By configuring the difference between the first contact angle and the second contact angle to be within 15°, the material of the pre-coating component 2 is the same as or similar to the material of the component to be coated 200. In this way, during the coating process, when the coating platform 1 approaches the coating assembly 3 along the coating direction X and the coating liquid is sequentially coated on the pre-coated surface P and the coating surface of the component to be coated through the coating assembly 3, the adhesion forces of the pre-coating component 2 and the component to be coated 200 to the coating liquid are the same or similar. Therefore, when the coating liquid passes through the junction of the two, the problem of liquid accumulation or liquid shortage caused by inconsistent adhesion forces can be effectively avoided, which is beneficial to improving the uniformity and quality of the coating film on the surface of the component to be coated 200, and further beneficial to improving the performance of the battery.

[0041] Optionally, the coating assembly 3 can move relative to the coating platform 1 along the coating direction X. It can be that the coating assembly 3 can move relative to the coating platform, or, alternatively, the coating platform 1 can move relative to the coating assembly, or both can move. This embodiment does not limit this.

[0042] As an optional implementation manner, along the coating direction X, the width of the pre-coating area 1b can be 1 cm to 2 cm. Exemplarily, the width of this pre-coating area can be, for example, 1 cm, 1.2 cm, 1.4 cm, 1.6 cm, 2 cm, etc. In this way, it can provide sufficient pre-coating space for the coating assembly 3, so that the coating assembly 3 can form a stable liquid bridge before starting to coat the component to be coated 200, which is beneficial to improving the coating fullness and coating uniformity of the coating assembly 3 for the component to be coated 200.

[0043] Exemplarily, the component 200 to be coated can be made of materials such as silicon wafers and battery wafers, and this embodiment does not limit this.

[0044] As an alternative implementation, the pre-coated component 2 is made of the same material as the component 200 to be coated. In this way, the first contact angle between the pre-coated component 2 and the coating liquid is equal to the second contact angle between the component 200 to be coated and the coating liquid. That is, the adhesion forces of the pre-coated component 2 and the component 200 to be coated to the coating liquid are the same. Thus, when the coating liquid passes through the junction of the two, the problems of liquid accumulation or liquid shortage can be effectively avoided.

[0045] In another alternative implementation, the pre-coated component 2 includes a semiconductor material. By setting the pre-coated component 2 as a semiconductor material, the difference between the first contact angle between the semiconductor material and the coating liquid and the second contact angle between the component 200 to be coated and the coating liquid is within 15°, so as to achieve the same or similar adhesion forces of the pre-coated component 2 and the component 200 to be coated to the coating liquid. Exemplarily, the pre-coated component 2 can be a silicon-based semiconductor material, a germanium-based semiconductor, etc.

[0046] It can be understood that the entire material of the pre-coated component 2 can be the same as or similar to that of the component 200 to be coated, or alternatively, the material of the pre-coated surface P of the pre-coated component 2 can be the same as or similar to that of the component 200 to be coated.

[0047] Please refer to Figure 1 and Figure 2 , in an alternative implementation, along the coating direction X, pre-coated areas 1b are provided on both sides of the coating working area 1a, and pre-coated components 2 are provided in each pre-coated area 1b. In this way, pre-coated surfaces P similar to its material are provided at both the front and rear ends of the coating of the component 200 to be coated, so that during coating, the problems of liquid accumulation or liquid shortage can be effectively avoided at both the front end and the rear end of the coating of the component 200 to be coated, which is beneficial to improving the uniformity and quality of the coating film on the surface of the component 200 to be coated.

[0048] In another alternative implementation, the pre-coated area 1b can also be provided around the coating working area 1a in a surrounding manner, so that the pre-coated component 2 is provided around the outer periphery of the component 200 to be coated. In this way, the pre-coated component 2 can surround the component 200 to be coated, so that the problems of liquid accumulation or liquid shortage that may occur on the coating side can be effectively avoided, further improving the uniformity and quality of the coating film on the surface of the component 200 to be coated.

[0049] It can be understood that multiple coating work areas 1a can be provided, and the multiple coating work areas 1a are arranged in sequence along the coating direction X. Alternatively, the multiple coating work areas 1a can also be arranged in sequence perpendicular to the coating direction X; similarly, multiple pre-coating areas 1b are provided, and each coating work area 1a is provided with at least one corresponding pre-coating area 1b. In this way, the multiple coating work areas 1a are beneficial to improving the coating efficiency, and at the same time, the correspondingly provided pre-coating areas 1b can avoid the problems of liquid accumulation or liquid shortage.

[0050] In some embodiments, the pre-coating member 2 and the member to be coated 200 are abutted against each other along the coating direction X. In this way, on the one hand, when the coating liquid passes through the junction of the pre-coating member 2 and the member to be coated 200, it can reduce the problem that the coating liquid flows into the boundary gap, resulting in waste of the coating liquid and contamination of other surfaces of the member to be coated 200; on the other hand, it makes the coating liquid more stable, especially at the boundary of the front end of the coating. The more stable the coating liquid is, the more uniform the coating is, which is beneficial to improving the quality of the formed coating film.

[0051] As an optional implementation manner, the pre-coating member 2 is movably arranged in the pre-coating area 1b, and the pre-coating member 2 can move relative to the member to be coated 200 along the coating direction X to adjust the distance between the pre-coating member 2 and the member to be coated 200. In this way, by adjusting the position of the pre-coating member 2, the distance between the pre-coating member 2 and the member to be coated 200 can be reduced to achieve the abutment of the pre-coating member 2 and the member to be coated 200 along the coating direction X; at the same time, by adjusting the position of the pre-coating member 2, the space of the coating work area can also be made larger, which is convenient for placing the member to be coated 200.

[0052] Please refer to Figure 3 , optionally, the slot coating device 100 further includes a fixing member 4. A through hole 11 is provided in the coating platform 1 along the coating direction X, the fixing member 4 is inserted through the through hole 11, and the fixing member 4 is connected to the pre-coating member 2. The fixing member 4 is configured to maintain the position of the pre-coating member 2 moving in the coating direction X. By inserting the fixing member 4 through the through hole 11 to maintain the position of the pre-coating member 2, on the one hand, during the coating process, the position of the pre-coating member 2 is fixed more reliably, and the pre-coating member 2 will not be driven by the coating assembly 3 to deviate, thus affecting the coating effect; on the other hand, the structure of the slot coating device 100 is made more compact.

[0053] Optionally, the fixing member may include but is not limited to screws or pins, etc. By fixing with screws, the pre-coating member 2 can be firmly fixed, and at the same time, the position adjustment of the pre-coating member 2 can be achieved through the screws. By fixing with pins, while achieving the fixation of the pre-coating member 2, the fixing operation can be made faster, which is beneficial to improving work efficiency.

[0054] As an alternative embodiment, the coating working area 1a and the pre - coating area 1b can be provided on the coating platform 1, or can be provided by opening a groove 12 in the coating platform 1. Exemplarily, as Figure 3 shown, the coating platform 1 is provided with a groove 12, and the groove 12 is formed as the coating working area 1a and the pre - coating area 1b. By setting the coating working area 1a and the pre - coating area 1b in the form of opening a groove, in the preparation stage before coating, a placement reference can be provided for the component 200 to be coated, so as to load the component 200 to be coated more quickly, make the loading of the component 200 to be coated more convenient, and is conducive to reducing the time of the preparation stage; at the same time, it can also avoid the problem that the component 200 to be coated is displaced during the coating process, which affects the coating quality. In addition, the setting of the groove 12 can also arrange the pre - coating component 2 in the groove 12, making the structure of the coating platform 1 more compact.

[0055] Optionally, the above - mentioned groove 12 includes a first sub - groove 121 and a second sub - groove 122. The first sub - groove 121 communicates with the second sub - groove 122. The first sub - groove 121 is formed as the coating working area 1a, and the second sub - groove 122 is formed as the pre - coating area 1b. It can be understood that the depth of the second sub - groove 122 can be greater than the depth of the first sub - groove 121, can be less than the depth of the first sub - groove 121, or the depth of the second sub - groove 122 is flush with the depth of the first sub - groove 121. Exemplarily, as Figure 3 shown, the depth of the second sub - groove 122 is greater than the depth of the first sub - groove 121. In this way, through the depth difference between the second sub - groove 122 and the first sub - groove 121, a limiting effect can be exerted on the pre - coating component 2, so that when adjusting the position of the pre - coating component 2, a sudden impact of the pre - coating component 2 on the component 200 to be coated can be avoided, which is conducive to buffering the collision between the pre - coating component 2 and the component 200 to be coated and avoiding damage to the component 200 to be coated. Since the component 200 to be coated is generally relatively thin, if the pre - coating component 2 directly collides with the component 200 to be coated, it is relatively easy to damage the component 200 to be coated.

[0056] In some embodiments, the coating assembly 3 includes a liquid supply system 31 and a coating die 32. The liquid - feeding end of the liquid supply system 31 is connected to the coating die 32. The liquid supply system 31 is configured to transport coating liquid to the coating die 32. A slit is provided on the side of the coating die 32 close to the component 200 to be coated, and the slit is used to press out the coating liquid to coat on the surface of the component 200 to be coated. Through the liquid supply system 31, the transportation of the coating liquid is realized, so that the coating liquid can be transferred from the container to the coating die 32; a slit is provided on the side of the coating die 32 close to the component 200 to be coated, which can make the thickness of the coating liquid on the surface of the component 200 to be coated uniform and appropriate, and is conducive to improving the quality of the coating film and the performance of the battery.

[0057] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A slit coating device, characterized in that: include: A coating platform, wherein the coating platform is provided with a coating work area and a pre-coating area, wherein the coating work area is configured to place the parts to be coated, and the pre-coating area is located on one side of the coating work area along the coating direction; A pre-coated component, the pre-coated component is placed in the pre-coating area, the contact angle between the pre-coated component and the coating liquid is a first contact angle, the contact angle between the component to be coated and the coating liquid is a second contact angle, the first contact angle and the second contact angle differ by less than 15°, the pre-coated component has a pre-coated surface, and the pre-coated surface is configured to be flush with the coating surface of the component to be coated; as well as A coating assembly is disposed above the coating platform. The coating assembly and the coating platform are relatively movable along a coating direction. The coating assembly is configured to coat the pre-coating surface and the coating surface.

2. The slit coating device according to claim 1, characterized in that: The pre-coated component and the component to be coated are made of the same material; or, The pre-coated component includes a semiconductor material.

3. The slit coating device according to claim 1, characterized in that: Along the coating direction, the pre-coating areas are provided on both sides of the coating working area, and each of the pre-coating areas is provided with the pre-coating component; or, The pre-coating area is arranged around the coating working area so that the pre-coating component is arranged around the outer periphery of the component to be coated.

4. The slit coating device according to any one of claims 1 to 3, characterized in that: The pre-coating component and the component to be coated abut against each other along the coating direction.

5. The slit coating device according to claim 4, characterized in that: The pre-coating component is movably disposed in the pre-coating area, and the pre-coating component can move relative to the component to be coated along the coating direction to adjust the distance between the pre-coating component and the component to be coated.

6. The slit coating device according to claim 5, characterized in that: The slit coating device also includes a fixing part, the coating platform is provided with a through hole along the coating direction, the fixing part is passed through the through hole, and the fixing part is connected to the pre-coating component, and the fixing part is configured to maintain the position of the pre-coating component moving in the coating direction.

7. The slit coating device according to any one of claims 1 to 3, characterized in that: The coating platform is provided with a groove, and the groove forms the coating working area and the pre-coating area.

8. The slit coating device according to claim 7, characterized in that: The groove includes a first sub-groove and a second sub-groove, the first sub-groove is connected to the second sub-groove, and the depth of the second sub-groove is greater than the depth of the first sub-groove, the first sub-groove is formed as the coating working area, and the second sub-groove is formed as the pre-coating area.

9. The slit coating device according to any one of claims 1 to 3, characterized in that: There are multiple coating work areas, and the multiple coating work areas are arranged in sequence along the coating direction; or, The plurality of coating working areas are arranged in sequence perpendicular to the coating direction; There are multiple pre-coating areas, and each coating work area corresponds to at least one pre-coating area.

10. The slit coating device according to any one of claims 1 to 3, characterized in that: The coating assembly includes a liquid supply system and a coating mold. The infusion end of the liquid supply system is connected to the coating mold. The liquid supply system is configured to transport coating liquid to the coating mold. A gap is provided on the side of the coating mold close to the part to be coated, and the gap is used to allow the coating liquid to be squeezed out to be coated on the surface of the part to be coated.

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