Lithium battery copper foil double-sided composite fluid coating device

Abstract

The invention relates to the technical field of lithium ion battery material processing equipment, and discloses a lithium battery copper foil double-sided composite fluid coating device which comprises a top platform, a dip-coating device and a solution tank, a dip-coating device is arranged in an inner cavity of the solution tank, and a top platform is arranged at the top end of the dip-coating device; the dip-coating device comprises a main shaft, at least one modulation ring, at least two guide mechanisms and a first power source, wherein the main shaft is arranged in the vertical direction; the at least one modulation ring is arranged on the outer wall of the main shaft in a sleeving manner; the at least two guide mechanisms are arranged at intervals in the circumferential direction of the modulation ring; the first power source drives the modulation ring to rotate relative to the main shaft. According to the dip-coating device, the copper foil forms a variable tape walking path in the dip-coating process, so that the contact length of the copper foil in a dip-coating solution is adjustable, the contact time is adjustable, and the dip-coating device can meet the requirements of different lithium battery copper foil surface treatment or functional coating processes.

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology, specifically to a double-sided composite fluid coating device for lithium battery copper foil. Background Technology

[0002] As the negative electrode current collector of lithium-ion batteries, the surface condition of lithium-ion battery copper foil directly affects the coating uniformity, adhesion performance, and the consistency and reliability of the battery. In the existing production or post-processing of lithium-ion battery copper foil, it is often necessary to clean, roughen, modify, or functionally coat the copper foil surface. Among these processes, dip coating is widely used because of its uniform coating and suitability for continuous conveyor belt operation. Existing dip coating equipment mostly uses a fixed number and fixed position of guide rollers to form a preset path for the copper foil in the solution pool. The dip coating contact length and contact time are usually difficult to adjust flexibly. When it is necessary to change the dip coating time, it is often necessary to replace the guide structure or adjust the overall layout of the machine, which is complicated to operate and has poor adaptability. In addition, existing dip coating equipment usually requires manual operation to thread the copper foil through multiple guide rollers or turning components in sequence during the threading process. The threading path is complicated and the operation is difficult. Furthermore, the copper foil surface is easily scratched or contaminated during the threading process, which is not conducive to the strict surface quality requirements of lithium battery copper foil. Meanwhile, due to the thinness and limited strength of copper foil, if the guide components are not properly designed during turning, bending, or small-radius guiding, edge wrinkles, local stress concentration, or surface damage can easily occur. Therefore, how to ensure the coating effect while achieving adjustable conveyor path, smooth turning, and taking into account both ease of conveying and surface friendliness remains a problem that existing technologies need to solve. Summary of the Invention

[0003] The purpose of this invention is to provide a double-sided composite fluid coating device for lithium battery copper foil to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a double-sided composite fluid coating device for lithium battery copper foil, comprising: a top platform, an immersion coating device, and a solution pool; the immersion coating device is provided in the inner cavity of the solution pool, and a top platform is provided at the top of the immersion coating device; The dip coating apparatus includes: a main shaft, at least one modulation ring, at least two guide mechanisms, and a first power source. The main shaft is arranged in a vertical direction. At least one of the modulation rings is sleeved on the outer wall of the main shaft. The at least two guide mechanisms are arranged circumferentially spaced along the modulation ring. The first power source drives the modulation ring to rotate relative to the main shaft. The guiding mechanism includes: a guide rod, a double-layered airbag, a first air tube, and a second air tube. The guide rod is rotatably mounted on a modulation ring, and the lower end of the guide rod is provided with a telescopic part. The double-layered airbag is disposed on the outer wall of the telescopic part, and the double-layered airbag includes an independent inner air chamber and an outer air chamber. The first air tube is connected to the outer air chamber, and the second air tube is connected to the inner air chamber.

[0005] Preferably, when multiple modulation rings are provided, the multiple modulation rings are concentrically arranged along the main axis and have different ring diameters. Two adjacent modulation rings are relatively fixed in the main axis direction and only have the degree of freedom to rotate around the main axis.

[0006] Preferably, each modulation ring is provided with a first power source, which is used to drive the corresponding modulation ring to rotate around the main shaft axis.

[0007] Preferably, the first power source is located on the outer periphery or inner side of the modulation ring and is directly or indirectly connected to the modulation ring.

[0008] Preferably, the modulation ring has a clearance space at the installation position corresponding to the guide mechanism.

[0009] Preferably, the outer side of the outer air cavity of the double-layer airbag is provided with a continuous flexible outer covering layer.

[0010] Preferably, the external air cavity includes a deformation zone and a guide zone. The deformation zone is located at one end near the clearance space and has higher flexibility than the guide zone. The guide zone is located outside the modulation ring and is used to contact the copper foil.

[0011] Preferably, a steering device is symmetrically arranged on both sides of the main shaft. The steering device includes an upper body and a lower body. The upper body is arranged on a top platform, and the lower body is arranged in the solution pool, located in the dip coating operation area.

[0012] Preferably, the upper body includes an upper shell, at least one upper ring, and an upper roller that cooperates with the upper ring; the lower body includes a lower shell, at least one lower ring, and a lower roller that cooperates with the lower ring. Each of the upper and lower shells contains at least one upper ring and one lower ring, and the upper and lower rings engage with each other to form a complete power ring structure when the steering device is closed, for guiding the copper foil in its direction of travel.

[0013] Preferably, the steering device further includes a second power source, which is disposed inside the upper body and is connected to the upper half ring drive to drive the upper half ring to rotate around its own axis.

[0014] The beneficial effects of the lithium battery copper foil double-sided composite fluid coating device proposed in this invention are as follows: 1. By setting at least one rotatable modulation ring on the main shaft and arranging at least two guiding mechanisms around the modulation ring, the copper foil forms a variable conveyor path during the dip coating process, thereby achieving adjustable contact length of the copper foil in the dip coating solution, and thus making the contact time adjustable, which can adapt to different lithium battery copper foil surface treatment or functional coating process requirements.

[0015] 2. The guiding mechanism adopts a double-layer airbag structure with an inner air chamber and an outer air chamber, and a continuous flexible outer covering is set on the outside of the outer air chamber. At the same time, the outer air chamber is divided into a deformation zone and a guiding zone. This allows the wrinkles generated by the outer air chamber during contraction or expansion to be concentrated in the deformation zone first, while the guiding zone that is in contact with the copper foil remains relatively flat. This reduces the adverse effects on the copper foil surface during the guiding process and improves the stability of the conveyor belt.

[0016] 3. The main shaft, modulation ring, and guide mechanism can move up and down synchronously as a whole to switch between working and non-working states. In conjunction with the contraction state of the telescopic part in the guide mechanism and the clearance space setting at the modulation ring, the device can make overall clearance for the copper foil conveying path in the non-working state. Thus, the copper foil traction and initial positioning can be completed without having to go around multiple guide components in sequence during the threading process, which significantly simplifies the threading steps, reduces the difficulty of operation, and improves the engineering operability of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded schematic diagram of the dip coating apparatus of the present invention; Figure 3 This is a partial schematic diagram of the dip-coating apparatus of the present invention; Figure 4 This is a cross-sectional view of the guiding mechanism of the present invention; Figure 5 This is a front view of the guiding mechanism of the present invention; Figure 6 This is a front view of the modulation ring of the present invention; Figure 7 This is a cross-sectional view of the steering device of the present invention; Figure 8 This is a partially enlarged view of the positioning pin of the present invention.

[0018] In the diagram: 1. Top platform; 2. Dipping device; 21. Main shaft; 221. Modulation ring; 222. Clearance space; 23. Guide mechanism; 2311. Guide rod; 2312. Telescopic part; 232. Double-layer airbag; 2321. Inner air chamber; 2322. Outer air chamber; 23221. Deformation zone; 23222. Guide zone; 233. First air pipe; 234. Second air pipe; 235. Rotary joint; 24. First power source; 3. Steering device; 31. Upper body; 311. Upper shell; 312. Upper ring; 313. Upper shaft roller; 32. Lower body; 321. Lower shell; 322. Lower ring; 323. Lower shaft roller; 33. Second power source; 34. Positioning pin; 35. Positioning hole; 4. Solution pool. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0020] This invention provides a technical solution for a double-sided composite fluid coating device for lithium battery copper foil. The detailed connection method is a well-known technology in the field. The working principle and process are mainly described below. The specific work is as follows.

[0021] like Figures 1-8 As shown, a double-sided composite fluid dip coating device for lithium battery copper foil includes a top platform 1, a dip coating device 2, a turning device 3, and a solution tank 4; the dip coating device 2 is provided in the inner cavity of the solution tank 4, and the top platform 1 is provided at the top of the dip coating device 2. The dip coating device 2 includes a main shaft 21, a modulation ring 221, and a guide mechanism 23. The main shaft 21 is arranged vertically, and its upper end is connected to a top platform 1. The top platform 1 is used to support the main shaft 21, the modulation ring 221, and the related rotation and guide mechanism 23. The solution pool 4 is located directly below the top platform 1 and is located below the ground plane, so that the solution pool 4 forms a sunken structure. This arrangement is beneficial to concentrate the dip coating area in the lower space of the equipment and facilitates centralized management and splash prevention of the solution. The top platform 1 is connected to the ground or foundation structure through a lifting device. The lifting device is used to drive the top platform 1 to rise or fall vertically, so that the main shaft 21, the modulation ring 221, and the guide mechanism 23 move up and down synchronously as a whole to switch between the working state and the non-working state. A steering device 3 is symmetrically arranged on both sides of the main shaft 21 to realize the turning transition of the copper foil between the horizontal and vertical conveyor belts.

[0022] More specifically, the steering device 3 includes an upper body 31 and a lower body 32. The upper body 31 is set on the top platform 1 and moves up and down synchronously with the top platform 1. The lower body 32 is set in the solution pool 4 and located in the dip coating operation area. It is used to guide the copper foil in the operation state. On the ground on both sides of the solution pool 4, there is a fully rolled copper foil roll and an empty roll of take-up shaft respectively. The fully rolled copper foil is used for unwinding, and the empty roll is used for take-up. After the copper foil is led out from the unwind shaft, it passes through the steering device 3 on one side, the dip coating device 2, and the steering device 3 on the other side in sequence, and finally winds onto the take-up shaft to realize continuous conveyor dip coating operation.

[0023] More specifically, at least one modulation ring 221 is sleeved on the outer wall of the main shaft 21, and at least two guide mechanisms 23 are spaced apart circumferentially along the modulation ring 221. The modulation ring 221 can rotate around the axis of the main shaft 21 under the drive of the first power source 24, which is used to change the position distribution of the guide mechanisms 23 in the circumferential direction, thereby changing the conveyor path of the copper foil in the solution pool 4. When multiple modulation rings 221 are provided, the multiple modulation rings 221 are concentrically arranged along the axis of the main shaft 21 and have different ring diameters. Each modulation ring 221 is relatively fixed in the direction of the main shaft 21 and only has the degree of freedom to rotate around the axis of the main shaft 21. Each modulation ring 221 is independently driven by the corresponding first power source 24 to realize multi-level or combined conveyor path modulation.

[0024] More specifically, each guiding mechanism 23 includes a guide rod 2311 rotatably mounted on the modulation ring 221. The lower end of the guide rod 2311 has a telescopic portion 2312. The guide rod 2311 can rotate around its own axis to adapt to the guiding requirements of the copper foil in different directions. A double-layered airbag 232 is provided on the outer wall of the telescopic portion 2312. The double-layered airbag 232 includes an independent inner air chamber 2321 and an outer air chamber 2322. The inner air chamber 2321 is vented and emptied through a second air pipe 234 to control the extension and retraction state of the telescopic portion 2312. The outer air chamber 2322 is vented and emptied through a first air pipe 233 to form a flexible guiding interface in contact with the copper foil. This allows the guide rod 2311 to... During rotation, the external air chamber 2322 and the internal air chamber 2321 can still be independently supplied and vented. The first air pipe 233 and the second air pipe 234 are connected to the external supply and exhaust equipment through the rotary joint 235. The rotary joint 235 is used to achieve the sealed connection and relative rotation of the gas channel when the guide rod 2311 rotates relative to each other. Its structure is not limited to single-channel or multi-channel rotary joint 235. It can be set according to the arrangement requirements of the first air pipe 233 and the second air pipe 234. The outer side of the external air chamber 2322 is provided with a continuous flexible outer coating layer so that the copper foil is always in contact with the continuous surface during the guiding process, thereby reducing the risk of local stress concentration and surface damage.

[0025] Furthermore, the outer air cavity 2322 includes a deformation zone 23221 and a guide zone 23222. The deformation zone 23221 is located at one end near the clearance space 222 of the modulation ring 221, and its flexibility is higher than that of the guide zone 23222. The guide zone 23222 is located outside the modulation ring 221 and is used to contact the copper foil, so that the wrinkles generated by the outer air cavity 2322 during contraction or expansion are preferentially released in the deformation zone 23221, while the guide zone 23222 remains relatively flat, thereby further improving the friendliness to the copper foil surface. To cooperate with the above structure, the modulation ring 221 is provided with a clearance space 222 at the installation position of the corresponding guide mechanism 23, so as to provide a accommodating area for the volume accumulation of the double-layer airbag 232 when the telescopic part 2312 contracts or the outer air cavity 2322 contracts, so that the lower end of the guide mechanism 23 can be basically flat with the lower end face of the modulation ring 221, avoiding obstruction of the copper foil conveying path in the non-operation state.

[0026] In this embodiment, the rollers and bearings that come into contact with the solution or are in a high-humidity environment preferably adopt a fully sealed, corrosion-resistant structure, and the corrosion-resistant materials and sealing ring types can be selected according to the properties of the solution; at the same time, an isolation cavity or liquid-blocking structure can be set on the outside of the bearing to further reduce the possibility of the solution entering the bearing and improve the long-term stability and reliability of the device.

[0027] More specifically, the steering device 3 includes an upper body 31 and a lower body 32. The upper body 31 includes an upper shell 311, at least one upper ring 312, and an upper roller 313 that cooperates with the upper ring 312. The lower body 32 includes a lower shell 321, at least one lower ring 322, and a lower roller 323 that cooperates with the lower ring 322. Each of the upper shell 311 and the lower shell 321 contains at least one upper ring 312 and one lower ring 322. When the steering device 3 is closed, the upper ring 312 and the lower ring 322 engage with each other to form a complete power ring structure, which is used to guide the copper foil in its direction of travel. The direction of travel is determined according to the width of the copper foil. To meet requirements for angle, steering angle, or steering stability, multiple upper rings 312 can be installed in the upper housing 311, and multiple lower rings 322 can be installed in the lower housing 321. The multiple upper rings 312 and multiple lower rings 322 are spaced apart along the copper foil traveling direction. When multiple upper rings 312 and lower rings 322 are installed, each upper ring 312 and the corresponding lower ring 322 form multiple steering units when the steering device 3 is closed. This allows the copper foil to be guided by multiple steering units simultaneously or sequentially during the steering process, thereby improving the support stability of the wide copper foil, reducing the stress burden on a single steering unit, and helping to reduce local stress concentration during the copper foil steering process.

[0028] In this embodiment, it should be noted that the number of the upper half ring 312 and the lower half ring 322 is not limited to the number shown in the above embodiments. The specific number can be set according to the actual process requirements, as long as the upper half ring 312 and the lower half ring 322 can rotate synchronously in the closed state and complete the copper foil turning and guiding. The upper half shell 311 is connected and fixed to the top platform 1, and the lower half shell 321 is connected and fixed to the bottom of the solution pool 4 or the bottom support structure, so that the turning device 3 forms an upper and lower split structure in the vertical direction. Through the lifting and lowering movement of the top platform 1, the upper body 31 can move closer or further away from the lower body 32 in the vertical direction, thereby To achieve the switching between the closed and open states of the steering device 3, the steering device 3 also includes a second power source 33. The second power source 33 is disposed inside the upper body 31 and is connected to the upper half ring 312 for transmission. It is used to drive the upper half ring 312 to rotate around its own axis. Since the upper half ring 312 and the corresponding lower half ring 322 are in contact or meshing with each other when the steering device 3 is closed, when the second power source 33 drives the upper half ring 312 to rotate, the driving force can be transmitted through the contact between the upper half ring 312 and the lower half ring 322, so that the lower half ring 322 rotates synchronously, thereby realizing the synchronous rotation of the complete power ring structure to complete the steering adjustment of the copper foil's travel direction.

[0029] Furthermore, when it is necessary to release the closed state of the steering device 3, perform threading, or perform equipment maintenance, the second power source 33 can be used to control the upper half ring 312 to rotate to a predetermined initial angle, so that the upper half ring 312 and the upper shaft roller 313, and the lower half ring 322 and the lower shaft roller 323 are all restored to a state parallel to the horizontal plane, thereby reducing the interference to the copper foil when the upper body 31 and the lower body 32 are separated, and facilitating the smooth separation of the upper body 31 and the lower body 32 under the action of the lifting mechanism. The second power source 33 can be a motor, servo motor, geared motor, or other power device that can provide controllable rotation output. It can be connected to the upper half ring 312 through direct connection, gear transmission, synchronous belt transmission, or other equivalent transmission methods. The specific form is not limited, as long as it can achieve the driving and control of the rotation state of the upper half ring 312.

[0030] More specifically, to ensure the alignment accuracy of the upper body 31 and lower body 32 when the steering device 3 is closed, so that the upper half ring 312 and lower half ring 322 can accurately align to form a complete power ring structure, a positioning pin 34 is provided at the top of the lower half shell 321, and a positioning hole 35 is provided on the upper half shell 311 at the position corresponding to the positioning pin 34; the positioning pin 34 and the positioning hole 35 constitute the positioning and fitting structure when the upper body 31 and lower body 32 are closed, the positioning pin 34 is a tapered or tapered guide section, and the positioning hole 35 is a matching tapered hole or a chamfered guide hole; when the upper body 31 approaches the lower body 32 downward under the drive of the lifting device and enters the closed position... During the closing process, the tapered positioning pin 34 first enters the positioning hole 35 and generates a self-guiding effect, so that the deviation of the upper half shell 311 relative to the lower half shell 321 in the plane is gradually corrected, thereby achieving accurate alignment of the upper body 31 and the lower body 32 at the closing termination position; the positioning pin 34 can be set to at least two, and arranged at intervals along the circumference of the lower half shell 321; the corresponding upper half shell 311 has positioning holes 35 that match the number and position of the positioning pins 34; through multi-point positioning, the repeatability and torsional resistance of the closing positioning can be further improved, so that the upper half ring 312 and the lower half ring 322 maintain a stable and consistent alignment relationship in multiple opening and closing cycles.

[0031] Example: In the initial state, the top platform 1 is in the raised position, and the main shaft 21, modulation ring 221 and guide mechanism 23 move upward with the top platform 1 and are located above the solution pool 4; the steering device 3 is in the separated state, the upper body 31 and the lower body 32 are far apart from each other, the upper half ring 312 and the lower half ring 322 are located in their respective housings, and the upper shaft roller 313 and the lower shaft roller 323 are both in the initial posture parallel to the horizontal plane. At this time, the telescopic part 2312 of each guide mechanism 23 is in the contracted state, the double-layer airbag 232 is not inflated or is in a low-pressure state, and the clearance space 222 on the modulation ring 221 is used to accommodate the volume of the double-layer airbag 232 in the contracted state, so that the lower end of the guide mechanism 23 is basically flat with the lower end face of the modulation ring 221, thereby forming a relatively open channel in the immersion coating area. In this non-operating state, the solution pool 4 does not form a substantial obstruction to the copper foil, and the whole device is in a state that is easy to thread and adjust. The operator places a full roll of copper foil onto an unwinding shaft on one side of the solution tank 4 and an empty roll receiving shaft on the other side of the solution tank 4. The copper foil is then led out from the unwinding shaft and passed horizontally through the space between the upper body 31 and lower body 32 of the first-side turning device 3, continuing downwards to the area above the solution tank 4, passing directly through the area where this device is located, and then guided to the corresponding position of the other-side turning device 3. Finally, the end of the copper foil is fixed to the empty roll receiving shaft. Since the turning device 3 is in a disengaged state, and the telescopic part 231 of the guide mechanism 23... 2. When in a contracted state, there is no need to sequentially wind multiple guide rollers or turning components during the threading process. The copper foil can be pulled along an approximately straight or gentle path, which significantly simplifies the threading steps and reduces the difficulty of operation. After the end of the copper foil is fixed to the empty winding shaft, even if the winding shaft is not continuously winding, the winding shaft can still provide a holding traction force on the copper foil, keeping the copper foil in a taut state when stationary. Through this holding traction, the copper foil maintains a stable force state in the area of ​​the turning device 3 and the device itself, avoiding sagging, swinging or path deviation due to slack. After the threading is completed, the lifting device is activated, causing the top platform 1 to move downwards in the vertical direction. As the top platform 1 descends, the main shaft 21, the modulation ring 221, and the guide mechanism 23 move closer to the solution pool 4. When the top platform 1 descends to the predetermined working height, the upper body 31 and the lower body 32 of the steering device 3 gradually close in the vertical direction. The upper half ring 312 and the corresponding lower half ring 322 end contact each other and form a complete power ring structure. The copper foil is clamped between the upper shaft roller 313 and the lower shaft roller 323. At the same time, the guide mechanism 23 still maintains the contracted state of the telescopic part 2312 to avoid additional interference to the copper foil in the initial closing stage of the steering device 3. After the steering device 3 is closed, the second power source 33 is started. The second power source 33 drives the upper half ring 312 to rotate around its own axis. Since the upper half ring 312 is in contact with the lower half ring 322, the rotation of the upper half ring 312 drives the lower half ring 322 to rotate synchronously through contact transmission. During this process, the upper shaft roller 313 and the lower shaft roller 323 rotate synchronously with the power ring structure, so that the copper foil held between them gradually changes the direction of travel, realizing a smooth transition of the copper foil from a horizontal running state to a vertical running state. When multiple upper half rings 312 and lower half rings 322 are set, multiple steering units can guide the copper foil simultaneously or sequentially, so that the wide copper foil can obtain more uniform support during the steering process. After the copper foil completes its turning and enters the vertical conveyor state, the inner air chamber 2321 of the guide mechanism 23 is activated to supply air, causing the telescopic part 2312 to extend gradually according to the predetermined stroke. The lower end of the guide rod 2311 enters the working position in the solution pool 4. Subsequently, according to the process requirements, the air supply and exhaust of the outer air chamber 2322 are controlled, so that the double-layer airbag 232 forms the required guide radius and forms flexible contact with the copper foil. At the same time, the first power source 24 is activated to drive the modulation ring 221 to rotate around the axis of the main shaft 21. As the modulation ring 221 rotates, the multiple guide mechanisms 23 set on it change their circumferential positions, thereby changing the travel path of the copper foil in the solution pool 4. This allows the copper foil to form one or more folding and changing dipping paths in the same solution pool 4. Through the above method, the contact length and contact time of the copper foil in the dipping solution can be flexibly adjusted as needed to achieve double-sided composite fluid dipping treatment. During the stable operation phase, the copper foil passes through the turning device 3, this device, and the other turning device 3 in a continuous conveyor belt manner, and completes the set immersion coating path in the solution pool 4. The roller in the guide mechanism 23 can be in a passive rotation state or driven by the drive component to reduce the relative slippage between the copper foil and the roller. The roller surface shape is used to suppress copper foil edge wrinkles and improve conveyor belt stability. Only inert guide components in contact with the copper foil are retained in the solution pool 4. The main rotating mechanism and power components are set above the liquid surface, and are equipped with a fully sealed, corrosion-resistant bearing structure and an isolation cavity or liquid-blocking structure to reduce the corrosion of mechanical components by the solution. After the dipping operation is completed, the air supply of the first power source 24 and the guide mechanism 23 is adjusted to restore the modulation ring 221 to its initial state and the telescopic part 2312 of the guide mechanism 23 is gradually retracted to its initial position. Then, the second power source 33 is started to rotate the upper half ring 312 to the predetermined initial angle, so that the upper shaft roller 313 and the lower shaft roller 323 are restored to a state parallel to the horizontal plane. Then, the lifting device drives the top platform 1 to move upward, so that the upper body 31 and the lower body 32 of the steering device 3 are separated in the vertical direction, thereby releasing the clamping of the copper foil. At this time, the device re-enters the non-operating state, and the copper foil conveyor path is restored to a simplified state, which is convenient for subsequent roll changing, maintenance or re-threading.

[0032] Through the above-described process, this invention achieves adjustable dip-coating contact length, smooth copper foil turning, and significantly simplified threading steps without changing the guide structure. It also effectively reduces adverse effects on the copper foil surface throughout the entire operation, making it suitable for continuous and highly consistent double-sided composite fluid coating operations of lithium battery copper foil.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium-copper foil double-sided composite fluid coating apparatus, characterized by, The application relates to a vertical immersion coating device. The device comprises a top platform (1), an immersion coating device (2) and a solution pool (4); the inner cavity of the solution pool (4) is provided with the immersion coating device (2), and the top end of the immersion coating device (2) is provided with the top platform (1). The immersion coating device (2) comprises: a main shaft (21) arranged in a vertical direction; at least one modulation ring (221) sleeved on the outer wall of the main shaft (21); at least two guide mechanisms (23) arranged in a circumferential direction of the modulation ring (221); a first power source (24) for driving the modulation ring (221) to rotate relative to the main shaft (21). The guide mechanism (23) comprises: a guide rod (2311) rotatably arranged on the modulation ring (221), wherein the lower end of the guide rod (2311) is provided with an expansion part (2312); a double-layer air bag (232) arranged on the outer wall of the expansion part (2312), wherein the double-layer air bag (232) comprises an inner air cavity (2321) and an outer air cavity (2322) which are independent of each other; a first air pipe (233) in communication with the outer air cavity (2322); a second air pipe (234) in communication with the inner air cavity (2321).

2. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 1, wherein When a plurality of modulation rings (221) are arranged, the plurality of modulation rings (221) are concentrically arranged along the axis of the main shaft (21) and have different diameters, and two adjacent modulation rings (221) are fixed relative to each other in the direction of the main shaft (21) and only have the freedom of rotating around the axis of the main shaft (21).

3. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 2, wherein Each modulation ring (221) is provided with a corresponding first power source (24) for driving the corresponding modulation ring (221) to rotate around the axis of the main shaft (21).

4. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 3, wherein The first power source (24) is arranged on the outer periphery or the inner side of the corresponding modulation ring (221) and is directly or indirectly connected with the modulation ring (221).

5. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 4, wherein The modulation ring (221) is provided with a space (222) at the mounting position of the guide mechanism (23).

6. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 5, wherein The outer side of the outer air cavity (2322) of the double-layer air bag (232) is provided with a continuous flexible outer layer.

7. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 6, wherein The outer air cavity (2322) comprises a deformation zone (23221) and a guide zone (23222), the deformation zone (23221) is located at one end close to the space (222) and has higher flexibility than the guide zone (23222), and the guide zone (23222) is located on the outer side of the modulation ring (221) and is used for contacting the copper foil.

8. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 7, wherein, The main shaft (21) is symmetrically provided with a steering device (3) on both sides, the steering device (3) comprises an upper main body (31) and a lower main body (32), the upper main body (31) is arranged on the top platform (1), and the lower main body (32) is arranged in the solution pool (4) and located in an immersion coating operation area.

9. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 8, wherein, The upper main body (31) comprises an upper half shell (311), at least one upper half ring (312) and an upper shaft roller (313) arranged in cooperation with the upper half ring (312), the lower main body (32) comprises a lower half shell (321), at least one lower half ring (322) and a lower shaft roller (323) arranged in cooperation with the lower half ring (322), the upper half shell (311) and the lower half shell (321) are each provided with at least one upper half ring (312) and one lower half ring (322), and the upper half ring (312) and the lower half ring (322) are mutually opposite to form a complete power ring structure in the closed state of the turning device (3) for turning and guiding the direction of the copper foil when passing.

10. The fluid coating apparatus for double-sided composite of lithium battery copper foil according to claim 9, wherein, The turning device (3) further comprises a second power source (33) arranged in the upper main body (31) and in transmission connection with the upper half ring (312) for driving the upper half ring (312) to rotate around its own axis.

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