A dry electrode film forming apparatus

Abstract

The utility model discloses a kind of dry electrode film-forming equipment, base material is transmitted to film-forming roller by unwinding roller, when making positive electrode material, powder laying is laid on the surface of base material by feeder, powder is scraped flat on the surface of film-forming roller by scraper assembly, then powder is formed electrode film after film-forming thinning by the roll gap between press roller and film-forming roller, and it plays the effect of pre-pressing;Then base material is conveyed to the roll gap between film-forming roller and composite roller, and the process of thinning composite is completed under the roll pressure of two;When making negative electrode material, only need to lay powder on the surface of base material by feeder, and scrape flat by scraper assembly, directly send to composite roller composite, without press roll pressure;Finally, the pole piece formed by the composite of base material and powder is conveyed to winding roller and is wound up. The whole equipment structure is simple, easy to maintain and maintain, and the whole film-forming process time is shorter, which is beneficial to improve production efficiency.

Description

Technical Field

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

[0002] Current dry electrode fabrication equipment mainly includes a double-cone feeding mechanism, a double-steel strip film-forming mechanism, a thinning and laminating mechanism, and a process reversing and unwinding mechanism. These mechanisms sequentially complete the processes of substrate feeding, film formation, calendering, thinning, laminating, and winding. Among them, the double-steel strip film-forming mechanism has a complex structure and a high failure rate, resulting in high overall maintenance and repair costs. Furthermore, the double-steel strip film-forming mechanism contains multiple sets of oil-heated rollers and numerous oil pipes, which not only poses a high risk of oil leakage but also results in a long roller surface heating time, leading to a prolonged film-forming time and affecting overall film-forming efficiency and production efficiency. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a dry electrode film forming device, which can solve the problems of complex film forming mechanism structure and low film forming efficiency in the existing equipment.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to provide a dry electrode film forming device, including a first frame, a second frame, a thinning and laminating mechanism disposed on the first frame, and a take-up and unwinding mechanism disposed on the second frame. The take-up and unwinding mechanism includes a take-up roller and an unwinding roller. The thinning and laminating mechanism includes a feeder, a doctor blade assembly, a film forming roller, a pressure roller, and a laminating roller. The feeder, the doctor blade assembly, the pressure roller, and the laminating roller are sequentially wrapped around one side of the film forming roller along the belt travel direction of the substrate. The feeder is used to lay powder on the surface of the substrate, and the doctor blade assembly is used to scrape the powder laid on the surface of the substrate.

[0005] As a further improvement to the above technical solution, a first support is provided on the first frame, a first movable plate is movably provided on the first support, and the moving direction of the first movable plate is perpendicular to the axial direction of the pressure roller, and the pressure roller is connected to the first movable plate through a bearing.

[0006] As a further improvement to the above technical solution, the first bracket is provided with a first slot, the first slot is elongated and its length direction is perpendicular to the axial direction of the pressure roller, the first movable plate is connected to the first bracket by a first screw, and the first screw passes through the first slot.

[0007] As a further improvement to the above technical solution, a second support is also provided on the first frame, and a second movable plate is movably disposed on the second support, and the moving direction of the second movable plate is perpendicular to the axial direction of the film forming roller; the doctor blade assembly includes a doctor blade, and the doctor blade is mounted on the second movable plate.

[0008] As a further improvement to the above technical solution, the doctor blade assembly further includes an arc-shaped baffle. The arc-shaped baffle and the doctor blade are arranged sequentially along the belt-carrying direction of the substrate. The arc-shaped baffle is mounted on the second bracket, and the side of the arc-shaped baffle facing the film-forming roller is set as an arc surface.

[0009] As a further improvement to the above technical solution, a fixing plate is provided on the second support, and a second slot is provided on the fixing plate. The second slot is elongated and its length direction is perpendicular to the axial direction of the film-forming roller. The second moving plate is connected to the fixing plate by the second screw, and the second screw passes through the second slot. A third slot is provided on the second moving plate. The third slot is arc-shaped and its curvature direction is parallel to the circumference of the film-forming roller. A third screw is provided on the scraper and passes through the third slot.

[0010] As a further improvement to the above technical solution, the thinning and laminating mechanism also includes a hydraulic cylinder. The laminating roller is mounted on a movable frame, the cylinder body of the hydraulic cylinder is mounted on the first frame, its piston rod is connected to the movable frame, and the extension and retraction direction of the piston rod of the hydraulic cylinder is the same as the arrangement direction of the laminating roller and the film forming roller.

[0011] As a further improvement to the above technical solution, both the winding and unwinding mechanism and the thinning and composite mechanism are provided with a correction component. The unwinding roller and one of the correction components are arranged sequentially along the belt-running direction of the substrate, and the composite roller and the other correction component are arranged sequentially along the belt-running direction of the substrate. The correction component is used to ensure that the substrate maintains a preset path during the belt-running process.

[0012] As a further improvement to the above technical solution, it also includes a transmission frame and a plurality of rollers, wherein the transmission frame is located between the first frame and the second frame, and the plurality of rollers are respectively disposed on the first frame, the second frame and the transmission frame.

[0013] As a further improvement to the above technical solution, a tension roller is provided on the transmission frame.

[0014] The beneficial effects of this invention are as follows: The substrate is conveyed to the film-forming roller via the unwinding roller. When producing the positive electrode material, the feeder lays the powder on the surface of the substrate, and the scraper assembly flattens the powder on the surface of the film-forming roller. The powder then passes through the gap between the pressure roller and the film-forming roller to form a thinner electrode film, which also serves as a pre-pressing effect. The substrate is then conveyed to the gap between the film-forming roller and the composite roller, where the thinning and lamination process is completed under the pressure of both rollers. When producing the negative electrode material, the feeder simply lays the powder on the surface of the substrate and flattens it with the scraper assembly before directly sending it to the composite roller for lamination, eliminating the need for pressure rollers. Finally, the electrode sheet formed by the composite of the substrate and powder is conveyed to the winding roller for winding. The entire equipment has a simple structure, is easy to maintain and repair, and the entire film-forming process is relatively short, which helps improve 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 film forming device provided in a preferred embodiment of the present invention;

[0017] Figure 2 This is a partial structural diagram of the dry electrode film forming device near the film forming roller provided in a preferred embodiment of the present invention;

[0018] Figure 3 This is a partial structural diagram of the dry electrode film forming equipment near the pressure roller provided in a preferred embodiment of the present invention;

[0019] Figure 4 This is a partial structural diagram of the dry electrode film forming device near the pressure scraper provided in a preferred embodiment of the present invention;

[0020] Figure 5 yes Figure 4 A structural diagram from another angle.

[0021] Reference numerals: 1. First frame; 2. Second frame; 3. Conveyor frame; 4. Roller; 5. Substrate; 6. Electrode sheet; 7. Thinning and composite mechanism; 8. Winding mechanism.

[0022] 11. First support; 12. Second support; 31. Tension roller; 71. Feeder; 72. Scraper assembly; 73. Film forming roller; 74. Pressure roller; 75. Composite roller; 76. Hydraulic cylinder; 81. Take-up roller; 82. Unwind roller; 83. Tracking component.

[0023] 111. First movable plate; 112. Bearing; 113. First slot; 114. First screw; 120. Second movable plate; 121. Fixed plate; 122. Second slot; 123. Second screw; 124. Third slot; 125. Third screw; 721. Arc-shaped baffle; 722. Scraper; 751. Movable frame. 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 This utility model provides a dry electrode film forming device, including a first frame 1, a second frame 2, a transfer frame 3, and a plurality of rollers 4. The transfer frame 3 is located between the first frame 1 and the second frame 2. The plurality of rollers 4 are respectively arranged on the first frame 1, the second frame 2, and the transfer frame 3. A thinning and laminating mechanism 7 is provided on the first frame 1, and a winding and unwinding mechanism 8 is provided on the second frame 2. The winding and unwinding mechanism 8 is used to wind and unwind the substrate 5, and the substrate 5 is carried by a portion of the rollers 4 on the transfer frame 3 and the rollers 4 on the first frame 1. The thinning and laminating process is completed by the thinning and laminating mechanism 7. During the thinning process, the powder forms an electrode film. During the laminating process, the electrode film and the substrate 5 are combined to form an electrode sheet 6. Then, the electrode sheet 6 is carried by another portion of the rollers 4 on the transfer frame 3, and finally the electrode sheet 6 is wound into the winding and unwinding mechanism 8.

[0026] For details, please see Figure 1-2The winding and unwinding mechanism 8 includes a winding roller 81 and an unwinding roller 82. The thinning and laminating mechanism 7 includes a feeder 71, a scraper assembly 72, a film-forming roller 73, a pressure roller 74, a laminating roller 75, and a hydraulic cylinder 76. The feeder 71, scraper assembly 72, pressure roller 74, and laminating roller 75 are sequentially wrapped around one side of the film-forming roller 73 along the conveying direction of the substrate 5. The feeder 71 is used to lay the powder on the surface of the substrate 5, and the scraper assembly 72 is used to scrape the powder laid on the surface of the substrate 5. The substrate 5 is unwound to the film-forming roller 73 by the unwinding roller 82. When making the positive electrode material, the feeder 71 lays the powder... The powder is placed on the surface of the substrate 5. The scraper assembly 72 scrapes the powder on the surface of the substrate 5 to make it flat. Then, the powder passes through the gap between the pressure roller 74 and the film forming roller 73 to form a thinner electrode film, which also has a pre-pressing effect. Then, the substrate 5 is conveyed to the gap between the film forming roller 73 and the composite roller 75, and the composite process is completed under the pressure of the two rollers. When making the negative electrode material, the feeder only needs to lay the powder on the surface of the substrate and scrape it flat by the scraper assembly, and then send it directly to the composite roller for composite, without the need for pressure roller pressing. Finally, the electrode sheet 6 formed by the composite of the substrate 5 and the powder is conveyed to the winding roller 81 for winding. The whole equipment has a simple structure, is easy to maintain and repair, and the whole film forming process is short, which helps to improve production efficiency.

[0027] Please see Figure 2-3 In this embodiment, a first support 11 and a second support 12 are provided on the first frame 1. A first movable plate 111 is movably disposed on the first support 11, and the moving direction of the first movable plate 111 is perpendicular to the axial direction of the pressure roller 74. The pressure roller 74 is connected to the first movable plate 111 through a bearing 112. A second movable plate 120 is movably disposed on the second support 12, and the moving direction of the second movable plate 120 is perpendicular to the axial direction of the film forming roller 73. A doctor blade assembly 72 is mounted on the second movable plate 120. When the substrate 5 passes through the pressure roller 74, the pressure roller 74 rotates. The bearing 112 ensures the rotational accuracy of the pressure roller 74 and reduces the friction between the pressure roller 74 and the first movable plate 111. The gap size between the pressure roller 74 and the film forming roller 73 can be adjusted by adjusting the position of the first movable plate 111. The distance between the doctor blade assembly 72 and the film forming roller 73 can be adjusted by adjusting the position of the second movable plate 120, thereby adjusting the thickness of the film formed on the surface of the substrate 5.

[0028] Specifically, the first support 11 is provided with a first slot 113. The first slot 113 is elongated and its length direction is perpendicular to the axis of the pressure roller 74. The first moving plate 111 is connected to the first support 11 by a first screw 114, and the first screw 114 passes through the first slot 113. By moving the first screw 114 along the length direction of the first slot 113, the pressure roller 74 is driven to move closer to or away from the film forming roller 73, thereby changing the size of the roller gap between the two. The structure is simple and easy to implement.

[0029] Please see Figure 2 , Figure 4 , Figure 5 The scraper assembly 72 includes an arc-shaped baffle 721 and a scraper 722. The scraper 722 is mounted on the second moving plate 120 and is used to evenly spread the powder on the surface of the film forming roller 73. The arc-shaped baffle 721 and the scraper 72 are arranged sequentially along the conveying direction of the substrate. The arc-shaped baffle 721 is mounted on the second support 12. The side of the arc-shaped baffle 721 facing the film forming roller 73 is set as an arc surface. After the scraper 722 scrapes, the excess powder will accumulate on the film forming roller 73. The arc-shaped baffle 721 can restrict the excess powder on the film forming roller 73.

[0030] For more details, please see Figure 4 A fixing plate 121 is provided on the second support 12, and a second slot 122 is provided on the fixing plate 121. The second slot 122 is elongated and its length direction is perpendicular to the axis of the film forming roller 73. The second moving plate 120 is connected to the fixing plate 121 by a second screw 123, and the second screw 123 passes through the second slot 122. By moving the second screw 123 along the length direction of the second slot 122, the scraper 722 is driven to move closer to or away from the film forming roller 73, thereby changing the distance between the two and realizing the thickness control of the film formed on the surface of the substrate 5.

[0031] Please see Figure 5 The second movable plate 120 is provided with a third slot 124. The third slot 124 is arc-shaped and its curvature is parallel to the circumference of the film forming roller 73. The doctor blade 722 is provided with a third screw 125, which passes through the third slot 124. By moving the third screw 125 along the arc of the third slot 124, the angle of the doctor blade 722 toward the film forming roller 73 can be changed, thereby ensuring the parallelism between the doctor blade 722 and the film forming roller 73. The structure is simple and easy to implement.

[0032] Please see Figure 2 The composite roller 75 is mounted on the movable frame 751, and the cylinder body of the hydraulic cylinder 76 is mounted on the first frame 1. Its piston rod is connected to the movable frame 751, and the extension and retraction direction of the piston rod of the hydraulic cylinder 76 is the same as the arrangement direction of the composite roller 75 and the film forming roller 73. By extending and retracting the piston rod of the hydraulic cylinder 76, the movable frame 751 can drive the composite roller 75 to move closer to or further away from the film forming roller 73, thereby changing the size of the roller gap between the film forming roller 73 and the composite roller 75. In addition, the hydraulic cylinder 76 can provide stable pressure for the composite roller 75 to ensure the effect of thinning and laminating the substrate 5.

[0033] Please see Figure 1Both the unwinding / rewinding mechanism 8 and the thinning / composite mechanism 7 are equipped with a correction element 83. The unwinding roller 82 and one of the correction elements 83 are arranged sequentially along the belt travel direction of the substrate 5, and the composite roller 75 and the other correction element 83 are arranged sequentially along the belt travel direction of the substrate 5. The correction element 83 is used to ensure that the substrate 5 maintains a preset path during belt travel. The substrate 5 undergoes correction once during unwinding, and the electrode 6 undergoes correction once after the substrate 5 and powder are thinned and composited to form the electrode sheet 6. This achieves bidirectional correction control, reduces the impact of tension fluctuations on the flatness of the substrate 5, and reduces the risk of production interruption. The correction element 83 can be a correction roller or other existing correction structure.

[0034] In this embodiment, a tension roller 31 is provided on the transmission frame 3. The tension roller 31 can maintain a constant tension on the electrode 6 during operation, preventing it from loosening or being overstretched, so as to prevent the electrode 6 from wrinkling or breaking.

[0035] 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 film forming apparatus, characterized in that: The device includes a first frame, a second frame, a thinning and laminating mechanism mounted on the first frame, and a take-up and unwinding mechanism mounted on the second frame. The take-up and unwinding mechanism includes a take-up roller and an unwinding roller. The thinning and laminating mechanism includes a feeder, a doctor blade assembly, a film-forming roller, a pressure roller, and a laminating roller. The feeder, the doctor blade assembly, the pressure roller, and the laminating roller are sequentially arranged around one side of the film-forming roller along the substrate's conveying direction. The feeder is used to lay powder on the substrate surface, and the doctor blade assembly is used to smooth the powder laid on the substrate surface.

2. The dry electrode film forming apparatus according to claim 1, characterized in that: The first frame is provided with a first support, and a first movable plate is movably mounted on the first support. The moving direction of the first movable plate is perpendicular to the axial direction of the pressure roller, and the pressure roller is connected to the first movable plate through a bearing.

3. The dry electrode film forming apparatus according to claim 2, characterized in that: The first support is provided with a first slot, which is elongated and its length direction is perpendicular to the axial direction of the pressure roller. The first movable plate is connected to the first support by a first screw, and the first screw passes through the first slot.

4. The dry electrode film forming apparatus according to claim 1, characterized in that: The first frame is also provided with a second support, on which a second movable plate is movably disposed, and the moving direction of the second movable plate is perpendicular to the axial direction of the film forming roller; the doctor blade assembly includes a doctor blade, which is mounted on the second movable plate.

5. The dry electrode film forming apparatus according to claim 4, characterized in that: The doctor blade assembly further includes an arc-shaped baffle. The arc-shaped baffle and the doctor blade are arranged sequentially along the feed direction of the substrate. The arc-shaped baffle is mounted on the second bracket, and the side of the arc-shaped baffle facing the film forming roller is set as an arc surface.

6. The dry electrode film forming apparatus according to claim 4, characterized in that: The second support is provided with a fixing plate, and the fixing plate is provided with a second slot. The second slot is elongated and its length direction is perpendicular to the axial direction of the film forming roller. The second moving plate is connected to the fixing plate by a second screw, and the second screw passes through the second slot. The second moving plate is provided with a third slot. The third slot is arc-shaped and its curvature direction is parallel to the circumference of the film forming roller. The doctor blade is provided with a third screw, and the third screw passes through the third slot.

7. The dry electrode film forming apparatus according to claim 1, characterized in that: The thinning and laminating mechanism also includes a hydraulic cylinder. The laminating roller is mounted on a movable frame, and the cylinder body of the hydraulic cylinder is mounted on the first frame. Its piston rod is connected to the movable frame, and the extension and retraction direction of the piston rod of the hydraulic cylinder is the same as the arrangement direction of the laminating roller and the film forming roller.

8. The dry electrode film forming apparatus according to claim 1, characterized in that: Both the winding and unwinding mechanism and the thinning and composite mechanism are equipped with a correction element. The unwinding roller and one of the correction elements are arranged sequentially along the belt travel direction of the substrate, and the composite roller and the other correction element are arranged sequentially along the belt travel direction of the substrate. The correction element is used to ensure that the substrate maintains a preset path during the belt travel process.

9. The dry electrode film forming apparatus according to any one of claims 1-8, characterized in that: It also includes a conveyor frame and several rollers, the conveyor frame being located between the first frame and the second frame, and the several rollers being respectively disposed on the first frame, the second frame and the conveyor frame.

10. The dry electrode film forming apparatus according to claim 9, characterized in that: Tension rollers are installed on the transmission frame.

Images