A dry method electrode coating apparatus

Abstract

The utility model discloses a kind of dry-method electrode coating equipment, after the bottom coating of current collector is completed by bottom coating mechanism, it is transported to drying mechanism, after the bottom coating material on the surface of current collector is dried by drying mechanism, it is transported to film-forming piece, at the same time, powder feeding piece provides powder to film-forming piece, so that powder is formed film on the surface of current collector that has completed drying, then again after the compounding of composite piece, the pole piece formed by compounding is transported to winding mechanism and is wound.In the dry-method electrode coating equipment, both the bottom coating process of current collector can be realized, and the film-forming and compounding process of powder on the surface of current collector can be realized, both save the equipment floor area, and reduce the overall equipment investment cost, and the winding and unwinding process between bottom coating machine and coating machine is saved, and the overall production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery coating, specifically to a dry electrode coating device. Background Technology

[0002] When using dry coating to fabricate electrodes, a primer layer needs to be applied to the current collector surface before coating the powder to improve powder adhesion. Currently, the conventional method involves applying a primer layer to the current collector surface using a primer coating machine, then attaching a transparent film to the primer surface during winding to protect its integrity. The wound current collector is then transferred to the unwinding mechanism of the coating machine for subsequent powder film formation and lamination on the current collector surface to form the final electrode. In this process, the primer coating and powder film formation / lamination on the current collector surface are performed in two separate sets of equipment, which increases the winding and unwinding steps and reduces overall production efficiency. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a dry electrode coating equipment, which can solve the problem of low production efficiency of the existing dry electrode coating manufacturing method.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a dry electrode coating device is provided, including a base coating mechanism, a drying mechanism, a film forming and compositing mechanism, and a winding mechanism. The base coating mechanism is used to apply a base coating to the surface of the current collector, and the drying mechanism is used to dry the base coating material on the surface of the current collector. The film forming and compositing mechanism includes a powder feeding component, a film forming component, and a compositing component. The powder feeding component is used to supply powder to the film forming component, the film forming component is used to form a film of powder on the dried surface of the current collector, and the compositing component is used to combine the current collector and the film-formed powder to form an electrode sheet. The winding mechanism is located at the output end of the compositing component and is used to wind up the electrode sheet.

[0005] As a further improvement to the above technical solution, the film-forming component includes a film-forming roller, the composite component includes a composite roller and a pair of rollers, the composite roller and the pair of rollers are arranged side by side along the conveying direction of the current collector, the film-forming roller is located on one side of the composite roller, and the output end of the powder feeding component is located between the film-forming roller and the composite roller.

[0006] As a further improvement to the above technical solution, the composite roller is fixedly arranged, and the film-forming composite mechanism further includes two roller gap adjustment components. The two roller gap adjustment components are respectively connected to the film-forming roller and the pair of rollers to adjust the roller gap size between the film-forming roller and the composite roller, as well as the roller gap size between the pair of rollers and the composite roller.

[0007] As a further improvement to the above technical solution, the primer coating mechanism includes a current collector feeding assembly, a corona electrode, a primer coating component, and a primer coating feeding assembly. The current collector feeding assembly is used to supply current collectors to the corona electrode, the corona electrode is used to perform corona treatment on the surface of the current collector, the primer coating feeding assembly is used to provide primer coating material to the primer coating component, and the primer coating component is used to coat the primer coating material onto the surface of the current collector.

[0008] As a further improvement to the above technical solution, the current collector feeding assembly includes an unwinding component, an unwinding traction component, and a release paper winding component. The unwinding component is used to unwind the current collector with release paper attached. The unwinding traction component is used to adjust the unwinding tension and transport the current collector to the corona unit. The release paper winding component is used to wind up the peeled release paper.

[0009] As a further improvement to the above technical solution, the drying mechanism includes several drying ovens and several conveying rollers. The drying ovens are arranged in a row, and the conveying rollers are provided at both the input and output ends of the drying ovens. Each drying oven includes two drying components for drying the primer material on the surface of the current collector. The two drying components are arranged opposite to each other, and the current collector coated with the primer material passes between the two drying components.

[0010] As a further improvement to the above technical solution, the winding mechanism includes a winding traction member and an electrode winding member. The winding traction member is used to adjust the electrode tension and convey the electrode to the electrode winding member, and the electrode winding member is used to wind up the electrode.

[0011] As a further improvement to the above technical solution, the winding mechanism further includes a flattening roller and a correction component. The flattening roller, the correction component, the winding traction component, and the electrode winding component are arranged sequentially along the belt travel direction of the electrode. The correction component is used to detect and correct the position of the electrode.

[0012] As a further improvement to the above technical solution, a testing mechanism is also included. The testing mechanism includes a surface density tester and a thickness tester. The surface density tester is used to detect the surface density of the coating on the electrode surface to determine the uniformity of the coating. The thickness tester is used to detect the thickness of the coating on the electrode.

[0013] As a further improvement to the above technical solution, the areal density test piece includes an X-ray areal density tester, and the thickness test piece includes a laser rangefinder.

[0014] The beneficial effects of this invention are as follows: After the current collector is coated by the primer coating mechanism, it is conveyed to the drying mechanism. The primer coating material on the surface of the current collector is dried by the drying mechanism and then conveyed to the film forming part. At the same time, the powder feeding part provides powder to the film forming part, so that the powder forms a film on the dried surface of the current collector. Then, it is laminated by the composite part, and the laminated electrode sheet is conveyed to the winding mechanism for winding. In this dry electrode coating equipment, both the primer coating process of the current collector and the film forming and lamination process of the powder on the surface of the current collector can be realized. This saves equipment floor space, reduces the overall equipment investment cost, and eliminates the winding and unwinding process between the primer coating machine and the coating machine, thereby improving the overall production efficiency. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the dry electrode coating equipment provided in the first embodiment of this utility model;

[0017] Figure 2 This is a flowchart of the dry electrode coating equipment provided in the first embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the dry electrode coating equipment provided in the second embodiment of this utility model.

[0019] Figure label: In Figure 1 The components are: 1. Primer coating mechanism, 2. Drying mechanism, 3. Film forming and laminating mechanism, 4. Inspection mechanism, 5. Winding mechanism, and 6. Roller passing mechanism.

[0020] 10. Current collector, 11. Current collector feeding assembly, 12. Corona discharge unit, 13. Primer component, 14. Primer feeding component, 20. Release paper, 21. Drying component, 30. Electrode, 31. Powder feeding component, 32. Film forming component, 33. Composite component, 41. Areal density test component, 42. Thickness test component, 51. Flattening roller, 52. Tracking component, 53. Winding and traction component, 54. Electrode winding component;

[0021] 111. Unwinding component; 112. Unwinding traction component; 113. Release paper rewinding component; 311. Leveling component; 321. Film forming roller; 331. Composite roller; 332. Pair of rollers.

[0022] exist Figure 3 In the middle, 7. Drying mechanism, 8. Testing mechanism, 9. Rewinding mechanism;

[0023] 60. Passing roller; 71. Drying oven; 72. Conveying roller; 81. All-in-one surface density and thickness measuring machine; 91. Flattening roller; 92. Rewinding traction component; 93. Electrode rewinding component. Detailed Implementation

[0024] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0025] Please see Figure 1 The first embodiment of this utility model provides a dry electrode coating device, including a base coating mechanism 1, a drying mechanism 2, a film forming and compositing mechanism 3, a detection mechanism 4, a winding mechanism 5, and several rollers 6. The base coating mechanism 1 is used to apply a base coating to the surface of the current collector 10. The drying mechanism 2 is used to dry the base coating material on the surface of the current collector 10. The film forming and compositing mechanism 3 is used to form a film and composit the powder on the surface of the current collector 10 to form the final electrode 30. The detection mechanism 4 is used to detect the quality of the electrode 30. The winding mechanism 5 is used to wind up the electrode 30. Several rollers 6 are respectively arranged at the input end, output end, and inside the mechanism of each mechanism. The rollers 6 are used to guide and support the current collector 10 and the electrode 30 to move along the material, and maintain the tension of the material strip to prevent it from being too loose or too tight.

[0026] Specifically, the film-forming and composite mechanism 3 includes a powder feeder 31, a film-forming component 32, and a composite component 33. The powder feeder 31 provides powder to the film-forming component 32, which forms a film on the dried current collector 10. The composite component 33 combines the current collector 10 and the formed powder to form an electrode 30. The winding mechanism 5 is located at the output end of the composite component 33. After the current collector 10 is coated by the base coating mechanism 1, it is conveyed to the drying mechanism 2. The base coating material on the surface of the current collector 10 is dried by the drying mechanism 2 and then conveyed to the film-forming component 32. At the same time, the powder feeder 31 provides powder to the film-forming component 32, so that the powder forms a film on the dried current collector 10. After being combined by the composite component 33, the composite electrode 30 is conveyed to the winding mechanism 5 for winding. In this dry electrode coating equipment, both the primer coating process of the current collector 10 and the film formation and composite process of powder on the surface of the current collector 10 can be realized. This not only saves the equipment floor space and reduces the overall equipment investment cost, but also eliminates the winding and unwinding process between the primer coating machine and the coating machine, thus improving the overall production efficiency.

[0027] More specifically, the film-forming component 32 includes a film-forming roller 321, and the composite component 33 includes a composite roller 331 and a pair of rollers 332. The composite roller 331 and the pair of rollers 332 are arranged side by side along the conveying direction of the current collector 10. The film-forming roller 321 is located on one side of the composite roller 331, and the output end of the powder feeder 31 is located between the film-forming roller 321 and the composite roller 331. When the current collector 10 is conveyed to the composite roller 331, the powder feeder 31 spreads the powder on the surface of the current collector 10, and the powder is then fed by the film-forming roller 321 and the composite roller 332. After passing through the gap of the composite roller 331, the powder adheres to the surface of the current collector 10 to form a film. At the same time, the current collector 10 and the film are pre-composite. Then, after passing through the gap between the composite roller 331 and the opposing roller 332, the current collector 10 and the film are thinned and recomposite. The whole process is achieved by three rollers. This avoids the rolling force from decreasing step by step due to too many rollers, which would affect the adjustment accuracy of the gap between adjacent rollers. This helps to ensure the thickness of the film and thus ensures the quality of the formed electrode 30.

[0028] In this embodiment, the composite roller 331 is fixedly installed, while the film-forming roller 321 and the opposing roller 332 are both movable. The film-forming composite mechanism also includes two roller gap adjustment components, which are respectively connected to the film-forming roller 321 and the opposing roller 332 to adjust the roller gap size between the film-forming roller 321 and the composite roller 331, as well as the roller gap size between the opposing roller 332 and the composite roller 331. The film-forming roller 321 and the opposing roller 332 are both movable and can be adjusted independently without affecting each other. The fixed composite roller 331 is used to fix the belt feeding direction. The thickness of the formed film is controlled by adjusting the roller gap size between the film-forming roller 321 and the composite roller 331, and the thickness of the finally formed electrode 30 is controlled by adjusting the roller gap size between the opposing roller 332 and the composite roller 331.

[0029] The powder feeder 31 has a leveling component 311 at its discharge port, which is adjustable in gap with the roller surface of the film forming roller 321. The leveling component 311 is used to adjust the parallelism between the discharge port and the collector 10 or the film forming roller 321. After the powder is discharged, the leveling component 311 can spread the powder evenly on the roller surface of the film forming roller 321 to avoid uneven coating thickness, edge effect or stripe defects caused by tilting.

[0030] The primer coating mechanism 1 includes a current collector feeding assembly 11, a corona discharge unit 12, a primer coating unit 13, and a primer coating feeding assembly 14. The current collector feeding assembly 11 is used to feed the current collector 10 to the corona discharge unit 12. The corona discharge unit 12 is used to perform corona treatment on the surface of the current collector 10 to enhance the adhesion of powder on the surface of the current collector 10. The primer coating feeding assembly 14 is used to provide primer coating material to the primer coating unit 13. The primer coating unit 13 is used to coat the primer coating material onto the surface of the current collector 10. In this embodiment, the primer coating unit 13 includes a gravure primer coating machine. The gravure primer coating machine has a gravure roller. The coating liquid is transferred through the cell structure of the gravure roller to achieve thin and uniform coating control.

[0031] To ensure the cleanliness of the surface of the current collector 10, release paper 20 is temporarily attached to its surface. The current collector feeding assembly 11 includes an unwinding component 111, an unwinding traction component 112, and a release paper winding component 113. The unwinding component 111 is used to unwind the current collector 10 with the release paper 20 attached. The unwinding traction component 112 is used to adjust the unwinding tension and transport the current collector 10 to the corona unit 12. The release paper winding component 113 is used to wind up the peeled release paper 20. When the unwinding component 111 releases the current collector 10, tension fluctuations may occur due to inertia or speed changes. The unwinding traction component 112 forms a stable tension range through active traction to prevent the current collector 10 material strip from becoming loose or overstretched.

[0032] In this embodiment, the drying mechanism 2 includes two drying elements 21, which are arranged side by side on the side of the current collector 10 coated with the primer material. Single-sided drying helps to reduce heat loss and lower energy consumption. Moreover, only one side of the drying element 21 needs to be arranged, which reduces the complexity of the equipment and maintenance costs.

[0033] The testing mechanism 4 includes a surface density tester 41 and a thickness tester 42. The surface density tester 41 is used to detect the surface density of the coating of the composite current collector 10 to determine the uniformity of the coating. The thickness tester 42 is used to detect the thickness of the coating of the composite current collector 10. Specifically, the surface density tester 41 includes an X-ray surface density meter, and the thickness tester 42 includes a laser rangefinder. Both the X-ray surface density meter and the laser rangefinder are non-contact measurements that do not damage the electrode 30. They can also measure the uniformity and thickness of the coating of the electrode 30 in real time during transmission, so as to adjust the gravure base coating machine in real time and adjust the size of the gap between the film forming roller 321, the composite roller 331, and the double roller 332 in real time.

[0034] The winding mechanism 5 includes a flattening roller 51, a correction component 52, a winding traction component 53, and an electrode winding component 54 arranged sequentially along the belt travel direction of the electrode sheet 30. The flattening roller 51 is used to remove wrinkles on the surface of the electrode sheet 30. The correction component 52 is used to detect and correct the position of the electrode sheet 30. The winding traction component 53 is used to adjust the tension of the electrode sheet 30 and transport the electrode sheet 30 to the electrode winding component 54 to avoid wrinkling, deformation, or breakage of the electrode sheet 30 due to uneven tension during winding. Finally, the electrode sheet 30 is wound up by the electrode winding component 54.

[0035] Please see Figure 1-2The working principle of the dry electrode coating equipment provided in the first embodiment of this utility model is as follows: the unwinding unit 111 unwinds the current collector 10 with release paper 20 attached. After passing through the unwinding traction unit 112, the current collector 10 is conveyed to the corona unit 12, and the release paper 20 is conveyed to the release paper winding unit 113. If there is no release paper 20 on the surface of the current collector 10, the release paper winding unit 113 is not needed. After the corona unit 12 performs corona treatment on the surface of the current collector 10, it conveys the current collector 10 to the primer unit 13. At the same time, the primer supply unit 14 provides primer material to the primer unit 13. The primer unit 13 coats the primer material on the surface of the current collector 10, and then conveys the current collector 10 coated with primer material to the drying unit 2 for drying. After drying is completed... The current collector 10 is then conveyed to the gap between the film forming roller 321 and the composite roller 331. Before the current collector 10 enters the gap, the powder feeder 31 lays powder on the surface of the current collector 10. After passing through the gap between the film forming roller 321 and the composite roller 331, the powder adheres to the surface of the current collector 10 to form a film, thus achieving pre-composite bonding between the current collector 10 and the film. Then, after passing through the gap between the composite roller 331 and the counter roller 332, the current collector 10 and the film undergo thinning and secondary bonding, ultimately forming the electrode 30. The electrode 30 then passes through the areal density tester 41 and the thickness tester 42 in sequence to complete the testing. Finally, it passes through the flattening roller 51, the correction component 52, the winding traction component 53, and the electrode winding component 54 in sequence, and the electrode 30 is finally wound up in the electrode winding component 54.

[0036] If the current collector 10 already contains a base coating and is protected by a release film, then a base coating is not required. The unwinding unit 111 unwinds the material and the release film is wound up by the release paper winding unit 113. The material is then conveyed through the above steps. At this time, the base coating feeder 14 does not need to provide base coating material to the base coating component 13, and the corona component 12, the base coating component 13, and the drying mechanism 2 only serve a transmission function and do not need to activate the corresponding functions.

[0037] Please see Figure 3 The second embodiment of this utility model provides a dry electrode coating device, including a primer coating mechanism, a drying mechanism, a film forming and compositing mechanism, a detection mechanism, a winding mechanism, and several rollers. The primer coating mechanism and the film forming and compositing mechanism are the same as those in the first embodiment, and will not be described again here. The difference is the structure of the drying mechanism 7, the detection mechanism 8, the winding mechanism 9, and the number and position of the rollers 60.

[0038] In this embodiment, there are more rollers 60 and they are more densely distributed. More rollers 60 can subdivide the tension range, reduce local sudden changes, avoid material wrinkling and stretching deformation, and through gradual adjustment by multiple rollers, the risk of current collector strip and electrode sheet deviation is reduced and the alignment accuracy is improved.

[0039] The oven 71 mechanism includes several ovens 71 and several conveyor rollers 72. The ovens 71 are arranged in a row, and conveyor rollers 72 are provided at both the input and output ends of the ovens 71. Each oven 71 includes two drying elements 711 for drying the primer material on the surface of the current collector. The two drying elements 711 are arranged opposite each other. The current collector coated with primer material passes between the two drying elements 711. Double-sided drying can make the current collector heat evenly on both sides, avoid local overheating or incomplete drying, and double-sided heat conduction can significantly accelerate liquid evaporation, which is beneficial to improving drying efficiency.

[0040] The testing unit 8 includes an integrated areal density and thickness measuring machine 81, which integrates areal density measurement and thickness measurement functions. It can simultaneously measure the areal density and thickness of the electrode, eliminating the need for the electrode to be transported from the areal density measurement station to the thickness measurement station, which helps to save space and reduce costs.

[0041] The winding mechanism 9 in this embodiment includes a flattening roller 91, a winding traction component 92, and an electrode winding component 93 arranged sequentially along the belt travel direction of the electrode sheet. This eliminates the need for a correction component and allows for manual periodic inspection and intervention, which helps to save on initial equipment costs and subsequent equipment maintenance costs.

[0042] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A dry electrode coating apparatus, characterized in that: The device includes a base coating mechanism, a drying mechanism, a film-forming and laminating mechanism, and a winding mechanism. The base coating mechanism is used to apply a base coating to the surface of the current collector, and the drying mechanism is used to dry the base coating material on the surface of the current collector. The film-forming and laminating mechanism includes a powder feeding component, a film-forming component, and a laminating component. The powder feeding component is used to supply powder to the film-forming component, the film-forming component is used to form a film of powder on the dried surface of the current collector, and the laminating component is used to combine the current collector and the film-formed powder to form an electrode. The winding mechanism is located at the output end of the composite and is used to wind up the electrode sheet.

2. The dry electrode coating equipment according to claim 1, characterized in that: The film-forming component includes a film-forming roller, and the composite component includes a composite roller and a pair of rollers. The composite roller and the pair of rollers are arranged side by side along the conveying direction of the current collector. The film-forming roller is located on one side of the composite roller, and the output end of the powder feeder is located between the film-forming roller and the composite roller.

3. The dry electrode coating equipment according to claim 2, characterized in that: The composite roller is fixedly installed, and the film-forming composite mechanism further includes two roller gap adjustment components. The two roller gap adjustment components are respectively connected to the film-forming roller and the pair of rollers to adjust the roller gap size between the film-forming roller and the composite roller, as well as the roller gap size between the pair of rollers and the composite roller.

4. The dry electrode coating equipment according to claim 1, characterized in that: The primer coating mechanism includes a current collector feeding assembly, a corona electrode, a primer coating assembly, and a primer coating feeding assembly. The current collector feeding assembly is used to supply current collectors to the corona electrode, the corona electrode is used to perform corona treatment on the surface of the current collector, the primer coating feeding assembly is used to provide primer coating material to the primer coating assembly, and the primer coating assembly is used to coat the primer coating material onto the surface of the current collector.

5. The dry electrode coating equipment according to claim 4, characterized in that: The current collector feeding assembly includes an unwinding component, an unwinding traction component, and a release paper winding component. The unwinding component is used to unwind the current collector with release paper attached. The unwinding traction component is used to adjust the unwinding tension and transport the current collector to the corona unit. The release paper winding component is used to wind up the peeled release paper.

6. The dry electrode coating equipment according to claim 1, characterized in that: The drying mechanism includes several drying ovens and several conveying rollers. The drying ovens are arranged in a row, and the conveying rollers are provided at both the input and output ends of the drying ovens. Each drying oven includes two drying components for drying the primer material on the surface of the current collector. The two drying components are arranged opposite to each other, and the current collector coated with the primer material passes between the two drying components.

7. The dry electrode coating equipment according to claim 1, characterized in that: The winding mechanism includes a winding traction member and an electrode winding member. The winding traction member is used to adjust the electrode tension and convey the electrode to the electrode winding member, and the electrode winding member is used to wind up the electrode.

8. The dry electrode coating equipment according to claim 7, characterized in that: The winding mechanism further includes a flattening roller and a correction component. The flattening roller, the correction component, the winding traction component, and the electrode winding component are arranged sequentially along the electrode's travel direction. The correction component is used to detect and correct the position of the electrode.

9. The dry electrode coating apparatus according to any one of claims 1-8, characterized in that: It also includes a testing mechanism, which includes a surface density tester and a thickness tester. The surface density tester is used to test the surface density of the coating on the electrode surface, and the thickness tester is used to test the thickness of the coating on the electrode.

10. The dry electrode coating equipment according to claim 9, characterized in that: The areal density test piece includes an X-ray areal density meter, and the thickness test piece includes a laser rangefinder.

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