Coating equipment and battery production line

Abstract

The utility model relates to the technical field of battery production, in particular to coating equipment and a battery production line. The coating equipment comprises a die head and a back roller, the die head comprises a coating opening, and the coating opening is used for spraying slurry; the back roller and the die head are arranged at an interval, and the coating opening faces the peripheral surface of the back roller and extends in the axial direction of the back roller; the back roller is provided with at least one coating unit, each coating unit comprises a working area, at least part of the working area is used for bearing a base material, the working area comprises a main body part and an edge part, and the edge part is arranged at at least one end of the main body part in the first direction; wherein a first gap is formed between the coating opening and the main body part, and the maximum gap between the coating opening and the edge part is smaller than the first gap. According to the coating equipment, the amount of the slurry applied to the base material at the corresponding position of the edge part by the coating opening can be reduced, and the thickness of the slurry of the base material at the corresponding position of the edge part can be reduced, so that the probability that the thickness of the slurry at the edge position of the film area of the base material is higher than that of the slurry at the middle position can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular, to a coating device and a battery production line. Background Art

[0002] What is provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] A coating device is an operating device that can use a coating device to coat a slurry on the surface of a substrate such as paper, film, metal sheet, etc. By coating different slurries, the specific surface properties of the substrate can be enhanced, for example, used in the field of battery manufacturing.

[0004] The coating process is one of the important production processes of a battery, and it is necessary to coat a slurry on a substrate to initially form an electrode sheet.

[0005] Generally, the back roller has a cylindrical structure, and the slurry is evenly coated on the surface of the substrate through the spraying port of the die head. However, when the substrate coated with the slurry is dried, it is easy to have a situation where the thickness of the slurry at the edge of the film area is higher than that at the middle position, which causes the edges of the positive electrode sheet and the negative electrode sheet to bulge after winding, resulting in a risk of lithium plating in a local area of the battery cell. Therefore, it is necessary to improve the coating device to reduce the probability that the thickness of the slurry at the edge position of the film area of the substrate is higher than that of the slurry at the middle position. Summary of the Utility Model

[0006] In view of the above problems, the present application provides a coating device and a battery production line, which solve the problem that in the prior art, when the substrate coated by the coating device is dried, the thickness of the slurry at the edge position of the film area of the substrate is higher than that of the slurry at the middle position.

[0007] A first aspect of an embodiment of the present application provides a coating device, which includes:

[0008] A die head, the die head includes a coating port for spraying a slurry; and

[0009] A back roller, the back roller and the die head are spaced apart, and the coating port faces the outer peripheral surface of the back roller and extends along the axial direction of the back roller; the back roller is provided with at least one coating unit, and each coating unit includes a working area, at least part of the working area is used for carrying the substrate, and the working area includes a main body part and an edge part, and the edge part is provided at at least one end of the main body part along a first direction;

[0010] Wherein, there is a first gap between the coating port and the main body part, and the maximum gap between the coating port and the edge part is less than the first gap, and the first direction is the axial direction of the main body part.

[0011] In the coating equipment of the present application, by making the maximum gap between the coating port of the die head and the edge part smaller than the first gap between the coating port and the main body part, the amount of slurry on the base material coated at the corresponding position of the edge part by the coating port can be reduced, and the thickness of the slurry on the base material at the corresponding position of the edge part can be decreased, thereby reducing the probability that the thickness of the slurry at the edge position of the film area of the base material is higher than that at the middle position.

[0012] In some embodiments of the present application, the coating unit further includes a connection area, which is provided at at least one end of the working area and is connected to the edge part.

[0013] In the embodiments of the present application, by providing the connection area, the rotation of the back roll can be achieved through the connection of the connection area with other components, so as to coat the slurry on the base material placed on the working area of the back roll, and the coating of the base material can be realized.

[0014] In some embodiments of the present application, the edge part includes a conical structure, the small head end of the conical structure is connected to the main body part, and the large head end of the conical structure is connected to the connection area.

[0015] In the embodiments of the present application, by setting the edge part as a conical structure, with the small head end of the conical structure connected to the main body part and the large head end of the conical structure connected to the connection area, the gap between the coating port and the small head end can be the maximum gap, the gap between the coating port and the large head end can be the minimum gap, and the gap between the coating port and the conical structure is between the maximum gap and the minimum gap. Then, the thickness of the slurry on the base material can gradually decrease along the axial direction of the conical structure from the middle to the edge, adjusting the thickness of the slurry on the base material and reducing the probability of slurry accumulation at the edge of the base material.

[0016] In some embodiments of the present application, the connection area has a cylindrical structure, the radius of the connection area is greater than the radius of the small head end, and the radius of the small head end is greater than or equal to the radius of the main body part.

[0017] In the embodiments of the present application, by setting the connection area as a cylindrical structure, where the radius of the connection area is greater than the radius of the small head end and the radius of the small head end is greater than or equal to the radius of the main body part, the edge part can be set as a conical structure with inconsistent radii at both axial ends, which is convenient for processing the back roll.

[0018] In some embodiments of the present application, the difference between the radius of the connection area and the radius of the main body part is greater than 0 and less than or equal to 50 microns.

[0019] In the embodiments of the present application, by making the difference between the radius of the connection area and the radius of the main body part greater than 0 and less than or equal to 50 microns, the influence of the side wall of the coating port of the die head on the base material can be reduced, and the probability of the side wall of the coating port scratching the base material can be decreased.

[0020] In some embodiments of the present application, the edge portion includes a cylindrical structure, and two ends of the cylindrical structure along the axial direction are respectively connected to the main body portion and the connection area.

[0021] In the embodiments of the present application, by setting the edge portion as a cylindrical structure and connecting two ends of the cylindrical structure along the axial direction to the main body portion and the connection area respectively, the processing of the edge portion can be facilitated, and the processing efficiency of the back roll can be improved.

[0022] In some embodiments of the present application, the cylindrical structure includes a first main body and a second main body. The first main body and the main body portion are integrally formed structures. The second main body is in a ring structure and is sleeved on the outer circumference of the first main body.

[0023] In the embodiments of the present application, by setting the cylindrical structure to include a first main body and a second main body, wherein the first main body and the main body portion are integrally formed structures, the second main body is in a ring structure and is sleeved on the outer circumference of the first main body, the structure of the back roll can be formed by sleeving the second main body at the corresponding position of the cylinder, and the process is simple and easy to implement.

[0024] In some embodiments of the present application, the radius of the cylindrical structure is greater than the radius of the main body portion.

[0025] In the embodiments of the present application, by making the radius of the cylindrical structure greater than the radius of the main body portion, the gap between the coating port and the cylindrical structure can be made smaller than the first gap between the coating port and the main body portion, thereby reducing the thickness of the slurry on the substrate placed on the surface of the cylindrical structure.

[0026] In some embodiments of the present application, the difference between the radius of the cylindrical structure and the radius of the main body portion is greater than 0 and less than or equal to 50 microns.

[0027] In the embodiments of the present application, by making the difference between the radius of the cylindrical structure and the radius of the main body portion greater than 0 and less than or equal to 50 microns, the influence of the side wall of the coating port of the die head on the substrate can be reduced, and the probability of the side wall of the coating port scratching the substrate can be reduced.

[0028] In some embodiments of the present application, the number of coating units is multiple, and the multiple coating units are arranged continuously along the first direction.

[0029] In the embodiments of the present application, by setting multiple coating units and arranging the multiple coating units continuously along the first direction, the multiple substrates can be coated with slurry simultaneously by the multiple coating units, and the production efficiency of the electrode sheet can be improved.

[0030] In a second aspect of the present application, a battery production line is proposed. The battery production line includes the coating equipment mentioned in the above embodiments, and the coating equipment is used to coat slurry on the substrate.

[0031] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specific embodiments of this application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 FIG. is a partial structural schematic diagram of a coating device provided in some embodiments of this application;

[0034] Figure 2 is Figure 1 a structural schematic diagram of the back roller of the coating device shown in ;

[0035] Figure 3 FIG. is a partial structural schematic diagram of another coating device provided in some embodiments of this application;

[0036] Figure 4 is Figure 3 a structural schematic diagram of the back roller of the coating device shown in ;

[0037] Figure 5 is Figure 4 another structural schematic diagram of the back roller of the coating device shown in ;

[0038] Figure 6 is Figure 4 a structural schematic diagram of the back roller of the coating device shown in in a working state;

[0039] Figure 7 is Figure 4 another structural schematic diagram of the back roller of the coating device shown in (including two coating units).

[0040] The reference numerals are as follows:

[0041] 100, coating device;

[0042] 10, die head; 11, coating port;

[0043] 20, back roller; 21, coating unit; 211, working area; 2111, main body part; 2112, edge part; 21121, first main body; 21122, second main body; 212, connection area;

[0044] 200, substrate;

[0045] X-X, the first direction; Y-Y, the second direction;

[0046] L1, the maximum gap; h1, the minimum gap;

[0047] L2, the first gap;

[0048] L3, the length of the working area;

[0049] R1, the radius of the main body part;

[0050] R2, the minimum radius of the edge part;

[0051] R3, the radius of the connection area. Detailed implementation manners

[0052] Hereinafter, 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 illustrate the technical solution of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two unless otherwise specifically defined.

[0055] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0057] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0060] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0061] The battery involved in the embodiments of the present application can be but is not limited to being used in electrical equipment such as vehicles, ships, or aircraft. The battery monomers, battery packs, etc. involved in the present application can be used to form the battery of the electrical equipment.

[0062] The electrical equipment using the battery as a power source in the embodiments of the present application can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0063] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the batteries and electrical devices described above, but also applicable to all batteries including boxes and electrical devices using batteries.

[0064] In the production process of batteries, coating equipment is used to coat slurries on substrates to fabricate electrode sheets. The coating equipment is an operating device for coating slurries on the surface of substrates, and by coating different slurries, specific surface properties of the substrates can be enhanced.

[0065] The coating process is one of the important production processes of batteries, and slurries need to be coated on substrates to initially form electrode sheets.

[0066] Generally, the back roller has a cylindrical structure, and slurries are evenly coated on the surface of the substrate through the spraying ports of the die head. However, when the substrate coated with slurries is dried, it is easy for the thickness of the slurries at the edge of the film area to be higher than that at the middle position, resulting in the edges of the positive electrode sheet and the negative electrode sheet bulging after winding, and leading to the risk of lithium plating in local areas of the battery cell. Therefore, it is necessary to improve the coating equipment to reduce the probability that the thickness of the slurries at the edge position of the film area of the substrate is higher than that of the slurries at the middle position, thereby reducing the risk of lithium plating in local areas of the battery cell caused by the edges of the positive electrode sheet and the negative electrode sheet bulging after winding.

[0067] The embodiments of the present application propose a coating equipment to solve this problem. The coating equipment includes a die head and a back roller. The die head includes a coating port for spraying slurries. The back roller and the die head are spaced apart, and the coating port faces the outer peripheral surface of the back roller and extends along the axial direction of the back roller. The back roller is provided with at least one coating unit, and each coating unit includes a working area. At least part of the working area is used to carry the substrate, and the working area includes a main body part and an edge part. The edge part is provided at at least one end of the main body part along the first direction. Among them, there is a first gap between the coating port and the main body part, and the maximum gap between the coating port and the edge part is smaller than the first gap. The first direction is the axial direction of the main body part. In the coating equipment of the present application, by making the maximum gap between the coating port of the die head and the edge part smaller than the first gap between the coating port and the main body part, the amount of slurries coated on the substrate corresponding to the edge part by the coating port can be reduced, and the thickness of the slurries at the position corresponding to the edge part of the substrate can be reduced, thereby reducing the probability that the thickness of the slurries at the edge position of the film area of the substrate is higher than that of the slurries at the middle position.

[0068] The coating equipment in the embodiments of the present application can be used in scenarios where slurries are coated on substrates, and can be applied in the battery field, the printing field, etc.

[0069] The following will describe the structure in the embodiments of the present application in detail with reference to the drawings.

[0070] A first aspect of an embodiment of the present application provides a coating device 100, as Figure 1 and Figure 3 shown. The coating device 100 includes a die head 10 and a back roller 20. The die head 10 includes a coating port 11 for ejecting a slurry. Wherein, the periphery of the coating port 11 has side walls, and these side walls enclose the coating port 11; the back roller 20 and the die head 10 are arranged at an interval. Wherein, the back roller 20 and the die head 10 are arranged at an interval along the Figure 1 Y - Y direction in Figure 2 , and the coating port 11 is arranged facing the outer peripheral surface of the back roller 20 and extends along the axial direction of the back roller 20; the back roller 20 is provided with at least one coating unit 21, and each coating unit 21 includes a working area 211. At least part of the working area 211 is used to carry the substrate 200, and the working area 211 includes a main body part 2111 and an edge part 2112. The edge part 2112 is arranged at at least one end of the main body part 2111 along the first direction; wherein, there is a first gap L2 between the coating port 11 and the main body part 2111, and the maximum gap L1 between the coating port 11 and the edge part 2112 is less than the first gap L2. The first direction is the axial direction of the main body part 2111, that is, Figure 2 the X - X direction in

[0071] , where the X - X direction is perpendicular to the Y - Y direction. Wherein, the X - X direction is the first direction, that is, the axial direction of the main body part 2111; the Y - Y direction is the second direction.

[0071] It should be noted that the die head 10 can store a slurry of active substances or other material pastes, and can output the slurry through the coating port 11 and coat it on the surface of the substrate 200, so as to realize the coating work on the substrate 200.

[0072] The back roller 20 can be a rotatable rotary part in the coating device 100. The substrate 200 is wound around the back roller 20, and the back roller 20 is used to make the substrate 200 run smoothly in the coating device 100. The material of the back roller 20 can be cast steel, cast iron, rubber, etc., and the embodiments of the present utility model do not limit this. Here, the coating port 11 can be in the structure of a rectangular hole, and the extending direction of the rectangular hole is consistent with the axial direction of the main body part 2111, which is convenient for coating the slurry on the substrate 200 in the working area 211 of the back roller 20 through the coating port 11.

[0073] In the coating device 100 of the present application, by making the maximum gap L1 between the coating port 11 of the die head 10 and the edge part 2112 less than the first gap L2 between the coating port 11 and the main body part 2111, the amount of slurry coated on the substrate 200 at the position corresponding to the edge part 2112 by the coating port 11 can be reduced, and the thickness of the slurry on the substrate 200 at the position corresponding to the edge part 2112 can be reduced, so that the probability that the thickness of the slurry at the edge position of the film area of the substrate 200 is higher than that at the middle position can be reduced.

[0074] In some embodiments of the present application, as Figure 2 and Figure 4 shown, the coating unit 21 further includes a connection area 212, the connection area 212 is provided at at least one end of the working area 211, and the connection area 212 is connected to the edge portion 2112.

[0075] It can be understood that the connection area 212 can be provided at one end of the working area 211 along X-X, or can be provided at both ends of the working area 211 along the X-X direction. The coating unit 21 can be connected to the power device of the coating equipment through the connection area 212, so that the connection area 212 and the working area 211 rotate synchronously, so as to coat the substrate 200 with slurry.

[0076] The connection area 212 here can have a cylindrical structure. These are all common setting methods, and the structure of the connection area 212 will not be described in detail here.

[0077] In the embodiments of the present application, by providing the connection area 212, the rotation of the back roller 20 can be realized through the connection of the connection area 212 with other components, so as to coat the substrate 200 placed on the working area 211 of the back roller 20 with slurry, and the coating of the substrate 200 is realized.

[0078] Optionally, as Figure 1 and Figure 2 shown, the edge portion 2112 includes a tapered structure, the small head end of the tapered structure is connected to the main body portion 2111, and the large head end of the tapered structure is connected to the connection area 212.

[0079] As Figure 2 shown, the length of the working area 211 along the X-X direction is L3. At this time, the working area 211 includes the main body portion 2111 and a part of the edge portion 2112. Among them, the surface of a part of the edge portion 2112 is not provided with the substrate 200. As Figure 6 shown, the surface of the working area 211 is covered with the substrate 200, and the surface of the substrate 200 facing away from the back roller 20 is used to receive the slurry.

[0080] In the embodiments of the present application, by setting the edge portion 2112 as a tapered structure, and the small head end of the tapered structure is connected to the main body portion 2111, and the large head end of the tapered structure is connected to the connection area 212, the gap between the coating port 11 and the small head end can be the maximum gap L1, the gap between the coating port 11 and the large head end is the minimum gap h1, and the gap between the coating port 11 and the tapered structure is between the maximum gap L1 and the minimum gap h1. Then, it can be made that the thickness of the slurry on the substrate 200 gradually decreases from the middle to the edge along the axial direction of the tapered structure, the thickness of the slurry on the substrate 200 is adjusted, and the probability of slurry accumulation at the edge of the substrate 200 is reduced.

[0081] Optionally, asFigure 2 and Figure 3 As shown in Figure 3 , the connecting region 212 has a cylindrical structure. The radius of the connecting region 212 is R3, the minimum radius of the edge portion 2112 is R2, and the radius of the main body portion 2111 is R1. Among them, the radius R3 of the connecting region 212 is greater than the radius R2 of the small head end, and the radius R2 of the small head end is greater than or equal to the radius R1 of the main body portion 2111.

[0082] In the embodiment of the present application, by setting the connecting region 212 as a cylindrical structure, where the radius R3 of the connecting region 212 is greater than the radius R2 of the small head end, and the radius R2 of the small head end is greater than or equal to the radius R1 of the main body portion 2111, the edge portion 2112 can be set as a tapered structure with inconsistent radii at both axial ends, which is convenient for processing the back roll 20.

[0083] Specifically, the difference between the radius R3 of the connecting region 212 and the radius R1 of the main body portion 2111 is greater than 0 and less than or equal to 50 micrometers.

[0084] In the embodiment of the present application, by making the difference between the radius R3 of the connecting region 212 and the radius R1 of the main body portion 2111 greater than 0 and less than or equal to 50 micrometers, the influence of the side wall of the coating port 11 of the die head 10 on the substrate 200 is reduced, and the probability of the side wall of the coating port 11 scratching the substrate 200 is reduced.

[0085] Specifically, as Figure 4 and Figure 5 shown, the edge portion 2112 includes a cylindrical structure, and both axial ends of the cylindrical structure are respectively connected to the main body portion 2111 and the connecting region 212.

[0086] It should be noted that the cylindrical structure and the main body portion 2111 can be a split structure, and the cylindrical structure and the connecting region 212 can also be a split structure. The three sections of the structure can be processed separately and then spliced to form the structure of the back roll 20, such as welding or bonding the three sections to achieve connection.

[0087] In the embodiment of the present application, by setting the edge portion 2112 as a cylindrical structure and connecting both axial ends of the cylindrical structure to the main body portion 2111 and the connecting region 212 respectively, the processing of the edge portion 2112 can be facilitated, and the processing efficiency of the back roll 20 can be improved.

[0088] Specifically, as Figure 5 shown, the cylindrical structure includes a first main body 21121 and a second main body 21122. The first main body 21121 and the main body portion 2111 are integrally formed structures. The second main body 21122 has an annular structure and is sleeved on the circumferential outer side of the first main body 21121.

[0089] The second main body 21122 here can adopt a film or rubber sleeve structure and can be directly sleeved on the position of the circumferential outer side of the first main body 21121.

[0090] Since the first main body 21121 and the main body portion 2111 are integrally formed structures, the structure of this back roller 20 is easier to process.

[0091] In the embodiment of the present application, by providing a cylindrical structure including a first main body 21121 and a second main body 21122, wherein the first main body 21121 and the main body portion 2111 are integrally formed structures, and the second main body 21122 is in an annular structure and is sleeved on the circumferential outer side of the first main body 21121, the structure of the back roller 20 can be formed by sleeving the second main body 21122 at the corresponding position of the cylinder, and the process is simple and easy to implement.

[0092] Specifically, the radius of the cylindrical structure is greater than the radius R1 of the main body portion 2111.

[0093] In the embodiment of the present application, by making the radius of the cylindrical structure greater than the radius R1 of the main body portion 2111, the gap between the coating port 11 and the cylindrical structure can be made smaller than the first gap L2 between the coating port 11 and the main body portion 2111, thereby reducing the thickness of the slurry on the substrate 200 placed on the surface of the cylindrical structure.

[0094] Here, the edge portion 2112 is a cylindrical structure. Compared with the previous conical structure, when the edge portion 2112 is a cylindrical structure, the maximum gap L1 between the edge portion 2112 and the coating port 11 and the minimum gap h1 between the edge portion 2112 and the coating port 11 are the same.

[0095] More specifically, the difference between the radius of the cylindrical structure and the radius R1 of the main body portion 2111 is greater than 0 and less than or equal to 50 microns.

[0096] In the embodiment of the present application, by making the difference between the radius of the cylindrical structure and the radius R1 of the main body portion 2111 greater than 0 and less than or equal to 50 microns, the influence of the side wall of the coating port 11 of the die head 10 on the substrate 200 can be reduced, and the probability of the side wall of the coating port 11 scratching the substrate 200 can be reduced.

[0097] Here, in addition to adopting a cylindrical structure and a conical structure, the edge portion 2112 can also adopt other shapes, such as a concave-convex structure, as long as the maximum gap between the coating port 11 and the edge portion 2112 is less than the first gap.

[0098] Optionally, as Figure 7As shown, the number of coating units 21 is multiple, and the multiple coating units 21 are arranged continuously in the first direction. Specifically, the number of coating units 21 can be two, three, or more.

[0099] In the embodiment of the present application, by providing multiple coating units 21 and arranging the multiple coating units 21 continuously in the first direction, the multiple coating units 21 can be used to simultaneously coat the multiple substrates 200 with slurry, thereby improving the efficiency of pole piece production.

[0100] For the coating device 100 of the embodiment of the present application, compared with the method of improving the structure of the die head 10, only by changing the structure of the back roller 20 can the gap between the coating port 11 and the edge portion 2112 be controlled, so as to reduce the coating amount of the substrate 200 on the surface of the edge portion 2112 and reduce the probability of the excessive thickness of the edge of the substrate 200.

[0101] It can be understood that the coating device 100 further includes a frame (not shown), and the frame is used to place the die head 10. Of course, the coating device 100 further includes a power component for realizing coating, which will not be elaborated here.

[0102] In the second aspect of the present application, a battery production line is proposed. The battery production line includes the coating device 100 mentioned in the above embodiment, and the coating device 100 is used to coat the substrate 200 with slurry.

[0103] The battery production line here further includes welding equipment, winding equipment, etc., to realize multiple processings in the battery production process, which will not be elaborated here.

[0104] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are given below.

[0105] In a first aspect of the embodiments of the present application, a coating device 100 is provided. The coating device 100 includes a die head 10 and a back roll 20. The die head 10 includes a coating port 11 for ejecting slurry. The back roll 20 and the die head 10 are spaced apart, and the coating port 11 is arranged facing the outer peripheral surface of the back roll 20 and extends along the axial direction of the back roll 20. The back roll 20 is provided with at least one coating unit 21. Each coating unit 21 includes a working area 211. At least part of the working area 211 is used to carry a substrate 200. The working area 211 includes a main body portion 2111 and an edge portion 2112. The edge portion 2112 is arranged at at least one end of the main body portion 2111 along a first direction. Wherein, there is a first gap between the coating port 11 and the main body portion 2111, and the maximum gap between the coating port 11 and the edge portion 2112 is smaller than the first gap. The first direction is the axial direction of the main body portion 2111. Optionally, the coating unit 21 further includes a connection area 212. The connection area 212 is arranged at at least one end of the working area 211, and the connection area 212 is connected to the edge portion 2112. Optionally, the edge portion 2112 includes a conical structure. The small head end of the conical structure is connected to the main body portion 2111, and the large head end of the conical structure is connected to the connection area 212. Optionally, the connection area 212 is a cylindrical structure. The radius of the connection area 212 is larger than the radius of the small head end, and the radius of the small head end is larger than or equal to the radius of the main body portion 2111. Optionally, the difference between the radius of the connection area 212 and the radius of the main body portion 2111 is greater than 0 and less than or equal to 50 micrometers. Optionally, the edge portion 2112 includes a cylindrical structure. The two ends of the cylindrical structure along the axial direction are respectively connected to the main body portion 2111 and the connection area 212. Optionally, the cylindrical structure includes a first main body 21121 and a second main body 21122. The first main body 21121 and the main body portion 2111 are integrally formed structures. The second main body 21122 is in a ring structure and is sleeved on the circumferential outer side of the first main body 21121. Optionally, the radius of the cylindrical structure is larger than the radius of the main body portion 2111. Optionally, the difference between the radius of the cylindrical structure and the radius of the main body portion 2111 is greater than 0 and less than or equal to 50 micrometers. Optionally, the number of the coating units 21 is multiple, and the multiple coating units 21 are arranged continuously along the first direction.

[0106] As mentioned above, the above are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A coating device, characterized in that, The coating device includes: a die head, the die head includes a coating port for ejecting a slurry; and a back roll, the back roll and the die head are arranged at an interval, the coating port faces the outer peripheral surface of the back roll and extends along the axial direction of the back roll; the back roll is provided with at least one coating unit, each coating unit includes a working area, at least part of the working area is used for carrying a substrate, and the working area includes a main body part and an edge part, the edge part is arranged at at least one end of the main body part along a first direction; wherein, there is a first gap between the coating port and the main body part, the maximum gap between the coating port and the edge part is smaller than the first gap, and the first direction is the axial direction of the main body part.

2. The coating device according to claim 1, characterized in that, The coating unit further includes: a connection area, the connection area is arranged at at least one end of the working area, and the connection area is connected to the edge part.

3. The coating device according to claim 2, wherein The edge part includes a conical structure, the small head end of the conical structure is connected to the main body part, and the large head end of the conical structure is connected to the connection area.

4. The coating device according to claim 3, wherein, The connection area has a cylindrical structure, the radius of the connection area is larger than the radius of the small head end, and the radius of the small head end is larger than or equal to the radius of the main body part.

5. The coating device according to claim 4, characterized in that, The difference between the radius of the connection area and the radius of the main body part is greater than 0 and less than or equal to 50 microns.

6. The coating device according to claim 2, wherein, The edge part includes a cylindrical structure, and the two axial ends of the cylindrical structure are respectively connected to the main body part and the connection area.

7. The coating device according to claim 6, characterized in that, The cylindrical structure includes a first main body and a second main body, the first main body and the main body part are of an integrally formed structure, and the second main body has an annular structure and is sleeved on the circumferential outer side of the first main body.

8. The coating device according to claim 6, characterized in that, The radius of the cylindrical structure is larger than the radius of the main body part.

9. The coating device according to claim 6, characterized in that, The difference between the radius of the cylindrical structure and the radius of the main body part is greater than 0 and less than or equal to 50 microns.

10. The coating device according to any one of claims 1 to 9, characterized in that, The number of the coating units is multiple, and the multiple coating units are arranged continuously along the first direction.

11. A battery production line, characterized in that, including the coating device according to any one of claims 1 to 10, the coating device is used for coating a slurry on a substrate.

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