Battery film slurry automatic coating device

Abstract

The utility model provides a kind of battery film slurry automatic coating device, including workbench, two opposite supports are fixedly installed on the workbench, automatic coater and top cover are fixedly installed between two supports, and several drying fans are installed on top cover;Transmission screw is rotatably installed on the both sides of workbench, and the any end of each transmission screw is rotatably passed through workbench, and is fixed with the output end of servo motor fixedly installed outside workbench, and transmission screw is connected with negative pressure exhibition platform by ball nut;In the automatic coater of the utility model, combing wheel is equidistantly distributed along pivot, and slurry is combed between sizing roller and coating roller, and opening control volume is matched with slurry box, effectively improve film thickness uniformity;Limit is formed by edge blocking plate, and material overflow and "fat edge" problem is solved from source, and production efficiency is improved;Drying fan and transmission screw cooperate, realize "coating-drying" integration, shorten process link time.

Description

Technical Field

[0001] This utility model belongs to the field of coating technology, and in particular relates to an automatic coating device for battery film slurry. Background Technology

[0002] In the production of precision energy storage devices such as lithium batteries and thin-film batteries, the coating of the battery membrane slurry is a core process that determines product performance. The uniformity of the coating and the smoothness of the membrane surface directly affect the battery's capacity consistency and safety performance. However, existing coating equipment still faces many technical bottlenecks in practical applications: Traditional coating equipment often uses a single coating roller to transfer slurry, which can easily lead to fluctuations in coating thickness due to differences in slurry flowability or unstable supply. Although some equipment uses a multi-roller structure, it lacks a slurry sorting and adjustment mechanism, making it difficult to solve the problem of local accumulation or sparse coating, directly causing uneven battery surface density, and even triggering safety hazards such as lithium dendrite precipitation.

[0003] During the coating process, the slurry is prone to forming "fat edges" (edge ​​thickness is higher than the center area) or overflow contamination at the edge of the substrate. The main reason is the lack of an effective edge restraint structure and poor return flow of the feeding system, which leads to excessive material supply to the edge. It is necessary to remedy this by repeatedly adjusting the linear speed ratio or cleaning the feeding nozzle, which seriously affects production efficiency.

[0004] Therefore, it is essential to invent an automatic coating device for battery film slurry. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an automatic coating device for battery film slurry, including a worktable, support frames, an automatic coater, a top cover, drying fans, transmission screws, a servo motor, and a negative pressure spreading platform. Two opposing support frames are fixedly installed on the worktable, and the automatic coater and the top cover are fixedly installed between the two support frames. Several drying fans are installed on the top cover. The transmission screws are rotatably installed on both sides of the worktable, and each end of the transmission screw rotatably passes through the worktable and is fixed to the output end of the servo motor fixedly installed outside the worktable. The transmission screws are connected to the negative pressure spreading platform through ball nuts.

[0006] Preferably, the automatic coating device includes a slurry box, a slurry roller, a mounting frame, a rotating shaft, a coating roller, a combing wheel, and an edge stop plate. The slurry box is fixedly mounted on two of the support frames. The slurry roller is rotatably mounted inside the lower part of the slurry box. The rotating shaft and the coating roller are rotatably mounted on two mounting frames fixedly mounted outside the lower part of the slurry box. Several combing wheels are fixedly mounted on the rotating shaft. An edge stop plate is installed on each of the mounting frames.

[0007] Preferably, the sizing roller is rotatably mounted at the lower opening of the sizing box, and the lower opening of the sizing box has an inwardly contracting structure, with a gap between the inner wall of the opening and the outer surface of the sizing roller.

[0008] Preferably, two identical mounting brackets are fixedly mounted on the lower outer side of the slurry box. The mounting brackets are located on the upper sides of the worktable. A rotating shaft mounted on the mounting bracket is close to the slurry roller, while the coating roller is away from the slurry roller relative to the rotating shaft.

[0009] Preferably, a plurality of the combing wheels are equidistantly mounted on the rotating shaft along its own axis, and the rotating shaft and the combing wheels are located between the sizing roller and the coating roller.

[0010] Preferably, the edge baffles are provided on the outer side of the sizing roller, coating roller and combing roller, and the axes of the two edge baffles are parallel to each other, which are used to restrict the outward flow of slurry.

[0011] Preferably, the sizing roller can apply slurry to the surface of the battery film, the coating roller and the combing roller can contact the slurry on the surface of the battery film, the battery film can be adsorbed on the negative pressure spreading platform, the negative pressure spreading platform is equipped with a negative pressure air pump and has negative pressure air holes, and the negative pressure spreading platform can be driven by the transmission screw to move laterally along the direction of the automatic coating device and the drying fan.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The automatic coating device of this invention features combing wheels that are equidistantly distributed along the rotating shaft, forming a slurry combing zone between the slurry roller and the coating roller. This zone can perform lateral uniform distribution of the initially transferred slurry. Combined with the precise control of the feed amount by the inner shrinkage slurry box opening, it effectively avoids local accumulation of coating material. Practical application verification shows that it is significantly better than traditional equipment in controlling the error of film thickness uniformity.

[0013] The edge baffle on the mounting bracket of this utility model forms a longitudinal limiting space, which can directly block the slurry from flowing to the outside of the substrate, solving the problems of "fat edges" and overflow from the source. It does not require frequent adjustment of process parameters and improves production efficiency compared with the existing remedial method of optimizing the linear velocity ratio.

[0014] The drying fan integrated into the top cover of this utility model works synchronously with the coating mechanism, and the drying intensity can be adjusted in real time according to the coating speed to avoid coating sagging or cracking; the transmission screw drives the substrate to pass through the coating area and the drying area at a uniform speed, realizing the integrated operation of "coating-uniform material-drying" and shortening the process connection time. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the main structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the automatic coating device of this utility model.

[0018] Figure 4 This is a utility model Figure 3 A magnified schematic diagram of the structure at point A.

[0019] In the picture: Workbench 1, support frame 2, automatic coater 3, slurry box 31, slurry roller 32, mounting frame 33, rotating shaft 34, coating roller 35, combing wheel 36, edge baffle plate 37, top cover 4, drying fan 5, transmission screw 6, servo motor 7, negative pressure spreading platform 8. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0022] As attached Figure 1 To be continued Figure 4 As shown: This utility model provides an automatic coating device for battery film slurry, comprising a worktable 1, a support frame 2, an automatic coater 3, a top cover 4, a drying fan 5, a transmission screw 6, a servo motor 7, and a negative pressure spreading platform 8. Two opposing support frames 2 are fixedly installed on the worktable 1, and the automatic coater 3 and the top cover 4 are fixedly installed between the two support frames 2. Several drying fans 5 are installed on the top cover 4. The transmission screws 6 are rotatably mounted on both sides of the worktable 1, and each end of the transmission screw 6 rotatably passes through the worktable 1 and is fixed to the output end of the servo motor 7 fixedly installed outside the worktable 1. The transmission screws 6 are connected to the negative pressure spreading platform 8 through ball nuts.

[0023] Furthermore, the automatic coating device 3 includes a slurry box 31, a slurry roller 32, a mounting frame 33, a rotating shaft 34, a coating roller 35, a combing wheel 36, and an edge baffle plate 37. The components are mechanically assembled to form a complete slurry transfer and even distribution mechanism. The slurry box 31 is made of 304 stainless steel and is vertically fixed to the inner crossbeams of the two support frames 2 by bolt assembly. Its internal cavity is used to store the battery film slurry to be coated. The coating roller 32 is a chrome-plated steel roller, which is rotatably mounted inside the slurry box 31 at both ends by deep groove ball bearings. The length of the roller is adapted to the width of the inner cavity of the slurry box 31. Two symmetrically distributed mounting frames 33 are fixedly installed on the lower outer side of the slurry box 31 by welding. The mounting frames 33 are made of 6061 aluminum alloy and CNC machined. The rotating shaft 34 and the coating roller 35 are rotatably mounted on their opposite inner sides by bearing seats. The rotating shaft 34 is made of 45 steel and has several combing wheels 36 fixedly installed on its surface by key connection. The inner side wall of each mounting frame 33 is also equipped with an edge baffle plate 37 by a slider guide structure, which can be finely adjusted in the direction perpendicular to the movement direction of the battery film.

[0024] Furthermore, the sizing roller 32 is rotatably mounted at the lower opening of the sizing box 31 via bearing seats at both ends. This opening adopts an inwardly contracting stepped structure, gradually narrowing from the inside of the cavity to the outside. At the smallest point of the opening, the inner wall maintains a gap of 0.1-0.3mm with the outer surface of the sizing roller 32. This gap design forms a sizing channel, ensuring that the sizing roller 32 can evenly pick up the sizing when rotating, while preventing the sizing from dripping freely due to excessive gap. At the same time, the inwardly contracting structure can utilize the sizing's own weight to form a pre-pressure, making the sizing adhere more tightly to the surface of the sizing roller 32 and improving the stability of sizing transfer.

[0025] Furthermore, two identical mounting brackets 33 are mirror-fixed on the lower outer side of the slurry box 31 by symmetrical welding. The mounting brackets 33 are rotatably mounted with a rotating shaft 34 and a coating roller 35 via precision bearings. The axis of the rotating shaft 34 is parallel to the axis of the sizing roller 32, and the center distance between the two is controlled at 5-8cm, so that the rotating shaft 34 is set close to the sizing roller 32. The axis of the coating roller 35 is also parallel to the axis of the rotating shaft 34, and the center distance between them is 10-12cm. It is farther away from the sizing roller 32 relative to the rotating shaft 34, forming a three-stage processing path of "sizing-combing-uniform distribution".

[0026] Furthermore, several combing wheels 36 are equidistantly installed on the rotating shaft 34 along its own axis. The combing wheels 36 are made of polyurethane and have an outer diameter of 5-8 cm. The spacing between adjacent combing wheels 36 can be adjusted to 2-5 cm according to the width of the battery film. The rotating shaft 34 and the combing wheels 36 are located in the vertical projection area between the sizing roller 32 and the coating roller 35. The lowest point of the outer circle of the combing wheel 36 is on the same horizontal plane as the lowest point of the outer circle of the sizing roller 32 and the coating roller 35, ensuring that the three can sequentially contact the surface of the battery film on the negative pressure spreading platform 8, realizing the continuous processing of slurry from "initial transfer - transverse combing - final uniform distribution".

[0027] Furthermore, edge baffles 37 are provided on the outer sides of the sizing roller 32, coating roller 35, and combing roller 36. The edge baffles 37 are long strip-shaped structures made of polytetrafluoroethylene, and their height covers the upper and lower halves of the rollers, while their length is adapted to the axial dimension of the rollers. The axes of the two edge baffles 37 are strictly parallel and perpendicular to the direction of movement of the battery film. Their inner edges maintain a gap of 0.5-1mm with the ends of the sizing roller 32 and coating roller 35, which does not affect the rotation of the rollers and forms a physical barrier to effectively limit the flow of slurry to the outer edge of the battery film, avoiding edge overflow and "fat edge" phenomenon in the coating.

[0028] Furthermore, the sizing roller 32 adheres to the sizing material on its surface and contacts the surface of the battery film, uniformly coating the sizing material onto the battery film surface. The coating roller 35 and the combing roller 36 then contact the sizing material on the battery film surface to achieve secondary uniform distribution and transverse combing of the sizing material, respectively. During the coating process, the battery film is adsorbed onto the negative pressure spreading platform 8. The platform 8 is made of porous stainless steel plate, and its interior is connected to a negative pressure air pump (model: VCH1028) installed below the platform through an air pipe. The platform has uniformly distributed negative pressure air holes with a diameter of 0.5 mm and a pore density of 5 holes / cm², which can generate a negative pressure adsorption force of 0.03-0.05 MPa. The bottom sides of the negative pressure spreading platform 8 are connected to the transmission screw 6 through ball nut pairs. The transmission screw 6 adopts C7 grade precision ball screw. Driven by the servo motor 7 (model: 110ST-M04030), it can drive the negative pressure spreading platform 8 to move laterally at a uniform speed along the length of the automatic coater 3 and the drying fan 5. The movement speed can be steplessly adjusted within the range of 0.5-3m / min.

[0029] The working principle is as follows: First, the battery film to be coated is placed on the negative pressure spreading platform 8. The negative pressure spreading platform 8 generates an adsorption force through a negative pressure air pump, so that the battery film is flat and fixed on the platform.

[0030] Secondly, the servo motor 7 starts and drives the transmission screw 6 to rotate. The transmission screw 6 drives the negative pressure spreading platform 8 to move laterally along the worktable 1 through the ball nut, so that the battery film is gradually conveyed towards the automatic coating machine 3.

[0031] Next, the automatic coating machine 3 starts working. The slurry in the slurry box 31 contacts the coating roller 32 through the lower opening. When the coating roller 32 rotates, it picks up the slurry. When the battery film moves under it, the coating roller 32 evenly coats the surface of the battery film with the slurry.

[0032] Then, as the negative pressure spreading platform 8 continues to move, the slurry initially coated on the surface of the battery film first comes into contact with the combing wheel 36 on the rotating shaft 34. The combing wheel 36 rotates with the rotating shaft 34 to comb the slurry laterally, eliminate local accumulation, and make the slurry initially evenly distributed on the surface of the battery film.

[0033] Subsequently, the slurry combed by the combing roller 36 continues to move with the battery film and comes into contact with the coating roller 35. During the rotation of the coating roller 35, the slurry is evenly distributed a second time, further improving the smoothness and consistency of the coating.

[0034] Meanwhile, throughout the coating process, the edge barrier 37 is always located outside the slurry roller 32, coating roller 35 and combing roller 36, forming a barrier to restrict the slurry from flowing to the edge of the battery film, thus avoiding edge overflow and coating "fat edge" phenomenon.

[0035] Finally, the coated battery film is moved to the bottom of the top cover 4, and the drying fan 5 on the top cover 4 is started to blow hot air onto the coating surface to dry the slurry coating, thus completing the automatic coating process of the battery film slurry.

[0036] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. An automatic coating device for battery film slurry, characterized in that, The system includes a workbench (1), a support frame (2), an automatic coater (3), a top cover (4), a drying fan (5), a transmission screw (6), a servo motor (7), and a negative pressure spreading platform (8). Two opposing support frames (2) are fixedly installed on the workbench (1). The automatic coater (3) and the top cover (4) are fixedly installed between the two support frames (2). Several drying fans (5) are installed on the top cover (4). The transmission screws (6) are rotatably installed on both sides of the workbench (1). Each end of the transmission screw (6) rotates through the workbench (1) and is fixed to the output end of the servo motor (7) fixedly installed outside the workbench (1). The transmission screws (6) are connected to the negative pressure spreading platform (8) through ball nuts.

2. The automatic coating device for battery film slurry as described in claim 1, characterized in that: The automatic coating device (3) includes a slurry box (31), a slurry roller (32), a mounting frame (33), a rotating shaft (34), a coating roller (35), a combing wheel (36), and an edge baffle (37). The slurry box (31) is fixedly mounted on two support frames (2). The slurry roller (32) is rotatably mounted inside the lower part of the slurry box (31). The rotating shaft (34) and the coating roller (35) are rotatably mounted on two mounting frames (33) fixedly mounted outside the slurry box (31). Several combing wheels (36) are fixedly mounted on the rotating shaft (34). Each mounting frame (33) is equipped with an edge baffle (37).

3. The automatic coating device for battery film slurry as described in claim 2, characterized in that: The sizing roller (32) is rotatably mounted at the lower opening of the sizing box (31). The lower opening of the sizing box (31) has an inwardly contracting structure, and there is a gap between the inner wall of the opening and the outer surface of the sizing roller (32).

4. The automatic coating device for battery film slurry as described in claim 3, characterized in that: Two identical mounting brackets (33) are fixedly mounted on the lower outer side of the slurry box (31). The mounting brackets (33) are located on the upper sides of the workbench (1). The rotating shaft (34) mounted on the mounting bracket (33) is close to the slurry roller (32), while the coating roller (35) is far away from the slurry roller (32) relative to the rotating shaft (34).

5. The automatic coating device for battery film slurry as described in claim 4, characterized in that: The rotating shaft (34) has several combing wheels (36) installed at equal intervals along its own axis. The rotating shaft (34) and the combing wheels (36) are located between the sizing roller (32) and the coating roller (35).

6. The automatic coating device for battery film slurry as described in claim 5, characterized in that: The edge baffles (37) are provided on the outer side of the sizing roller (32), coating roller (35) and combing roller (36). The axes of the two edge baffles (37) are parallel and are used to restrict the outward flow of slurry.

7. The automatic coating device for battery film slurry as described in claim 6, characterized in that: The sizing roller (32) can apply slurry to the surface of the battery film. The coating roller (35) and the combing roller (36) can contact the slurry on the surface of the battery film. The battery film can be adsorbed on the negative pressure spreading platform (8). A negative pressure air pump is installed on the negative pressure spreading platform (8), and negative pressure air holes are provided on it. The negative pressure spreading platform (8) can be driven by the transmission screw (6) to move laterally along the direction of the automatic coating device (3) and the drying fan (5).

Images