Eight-roller dry electrode film forming equipment

Abstract

The utility model discloses eight-roller dry electrode film-forming equipment which comprises a feeding mechanism, a film-forming mechanism and a film-forming mechanism, the feeding mechanism is arranged at the front end of the eight-roller mechanism, and the eight-roller mechanism is used for pressing the dry powder material into an electrode film and pulling the electrode film to the rear end of the eight-roller mechanism; a protective film unwinding mechanism and a protective film winding mechanism, the protective film unwinding mechanism and the protective film winding mechanism are arranged on the same side of the eight-roller mechanism, the protective film is wound on the eight-roller mechanism, and the electrode film is adhered to the protective film; the current collector unwinding mechanism and the current collector winding mechanism are arranged on the two sides of the eight-roller mechanism respectively, the current collector and the protective film penetrate through the rear end of the eight-roller mechanism at the same time, and the electrode film is compounded on the current collector. According to the eight-roller dry electrode film forming equipment, modular design is adopted, disassembly and assembly are convenient, the maintenance cost is reduced, a protective film is adopted for bearing tension in the traction process of a dry powder film, the problem of film breakage is solved, and the product yield is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery production technology, specifically to an eight-roller dry electrode film forming device. Background Technology

[0002] Dry electrode film formation mainly involves binder fibrosis technology, a coating technique that does not use liquid solvents to disperse active materials and conductive additives. Instead, it utilizes solid powder to directly mix active materials, conductive agents, and binders together, then processes them through a multi-stage roller press to thin them into a film, coating the mixture onto a current collector (such as aluminum or copper foil) to form a film of a certain thickness, thus achieving the preparation of a dry electrode film.

[0003] Compared to traditional wet coating technology, dry electrode technology eliminates the use of solvents (such as NMP, N-methylpyrrolidone), eliminating the need for solvent drying and recycling steps. This makes the manufacturing process simpler, faster, more economical, and more environmentally friendly. However, the application of dry electrode technology in actual production presents some challenges, such as ensuring the uniformity and efficiency of the dry powder material during the dry electrode film production process, its impact on film conveyor belt efficiency, and how to improve the efficiency of subsequent equipment disassembly and maintenance.

[0004] Therefore, there is a need to provide an eight-roller dry electrode film forming device to solve the above problems. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides an eight-roller dry electrode film forming device, which adopts a modular design, making it easy to disassemble and assemble, reducing maintenance costs. At the same time, it uses a protective film to bear the tension during the traction process of the dry powder film, solving the problem of film breakage and improving product yield.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An eight-roller dry electrode film forming apparatus, comprising:

[0008] The feeding mechanism is used to provide dry powder materials for making electrode films;

[0009] An eight-roll mechanism is provided, wherein the discharge end of the feeding mechanism is located at the front end of the eight-roll mechanism, and the eight-roll mechanism is used to press the dry powder material into an electrode film and pull it to the rear end of the eight-roll mechanism.

[0010] A protective film unwinding mechanism and a protective film rewinding mechanism are used for releasing and rewinding the protective film. The protective film unwinding mechanism and the protective film rewinding mechanism are located on the same side of the eight-roll mechanism. The protective film is wound around the eight-roll mechanism along the conveyor path of the electrode film, and the electrode film is adhered to the protective film. The electrode film is conveyed to the rear end of the eight-roll mechanism and separated from the protective film.

[0011] The current collector unwinding mechanism and the current collector winding mechanism are used for releasing and winding the current collector. The current collector unwinding mechanism and the current collector winding mechanism are respectively arranged on both sides of the eight-roll mechanism. The current collector and the protective film pass through the rear end of the eight-roll mechanism at the same time, and the electrode film is composited on the current collector.

[0012] As a further improvement to the above technical solution, the eight-roller mechanism includes a first pressure roller assembly, a second pressure roller assembly, and a steel roller assembly arranged sequentially from front to back, and the central axes of the first pressure roller assembly, the second pressure roller assembly, and the steel roller assembly are located on the same horizontal plane.

[0013] As a further improvement to the above technical solution, the first pressure roller assembly includes a first pressure roller, a second pressure roller, and a third pressure roller with the same roller diameter. The discharge end of the feeding mechanism is located above the first pressure roller and the second pressure roller, and the protective film is wrapped around the third pressure roller.

[0014] As a further improvement to the above technical solution, the second pressure roller assembly includes three traction rollers with the same roller diameter. The protective film is wound sequentially around the three traction rollers. The roller diameter of the traction roller is the same as that of the first pressure roller, and the roller spacing between the first pressure roller assembly and the second pressure roller assembly gradually decreases.

[0015] As a further improvement to the above technical solution, the steel roller assembly includes two steel rollers, the diameter of which is larger than the diameter of the traction roller.

[0016] As a further improvement to the above technical solution, the protective film released by the protective film unwinding mechanism enters the eight-roll mechanism from the gap below the second pressure roller and the third pressure roller. The electrode film adheres to the protective film and passes around the second pressure roller assembly and the steel roller assembly in sequence. When the protective film passes between the two steel rollers, it separates from the electrode film and passes out and is wound up on the protective film winding mechanism.

[0017] As a further improvement to the above technical solution, a laser thickness gauge is provided between the steel roller and the current collector winding mechanism. The laser thickness gauge is used to measure the thickness of the current collector after composite.

[0018] As a further improvement to the above technical solution, a scraper is provided at the lower end of the first and third pressure rollers and at the upper end of the second pressure roller.

[0019] As a further improvement to the above technical solution, the feeding mechanism includes a filter hopper and a vibrating plate. The discharge port of the filter hopper is located at the feed end of the vibrating plate, and the discharge end of the vibrating plate is located above the first pressure roller and the second pressure roller.

[0020] As a further improvement to the above technical solution, a feeding ladder is provided at one end of the feeding mechanism.

[0021] The beneficial effects of this utility model are:

[0022] The eight-roller device of this utility model adopts a modular design, with three rollers forming a module, which can be easily disassembled and assembled. During subsequent maintenance, problematic parts can be disassembled and repaired in a targeted manner, avoiding the disassembly and assembly of other parts and increasing maintenance costs. At the same time, a protective film is set up to effectively bear the tension required for the dry powder film traction process, solving the problem of film breakage due to insufficient tension during the traction process and improving product yield. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the structure of the eight-roller dry electrode film forming equipment of this utility model;

[0025] Figure 2 This is a schematic diagram of the eight-roller mechanism of this utility model.

[0026] Reference numerals: 1. Feeding mechanism; 101. Filter hopper; 102. Vibratory feeder; 2. Eight-roller mechanism; 201. First pressure roller assembly; 211. First pressure roller; 212. Second pressure roller; 213. Third pressure roller; 202. Second pressure roller assembly; 203. Steel roller assembly; 3. Protective film unwinding mechanism; 4. Protective film winding mechanism; 5. Current collector unwinding mechanism; 6. Current collector winding mechanism; 7. Electrode film; 8. Protective film; 9. Current collector; 10. Electrode sheet; 11. Scraper; 12. Feeding ladder; 13. Roller passing mechanism; 14. Laser thickness gauge. Detailed Implementation

[0027] 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.

[0028] Reference Figure 1 , Figure 2An eight-roller dry electrode film forming device includes a feeding mechanism 1, an eight-roller mechanism 2, a protective film unwinding mechanism 3, a protective film winding mechanism 4, a current collector unwinding mechanism 5, and a current collector winding mechanism 6. The electrode film material is primarily dry powder, and the quality and proportion of the dry powder directly affect the performance of the final product. In this example, the feeding mechanism 1 provides the dry powder material to the eight-roller mechanism 2. The feeding mechanism 1 includes a filter hopper 101 and a vibrating plate 102, ensuring the uniformity and impurity-free nature of the dry powder material, thereby improving the quality of the electrode film 7. The discharge end of the feeding mechanism 1 is located at the front end of the eight-roller mechanism 2. The eight-roller mechanism 2 continuously presses the dry powder material received from the feeding mechanism 1 through multiple rollers to form a uniform and dense electrode film 7. Furthermore, the eight-roller mechanism 2 not only achieves material pressing and forming but also guides the electrode film 7 to the rear end of the eight-roller mechanism 2, preparing it for subsequent lamination processes. The protective film unwinding mechanism 3 and the protective film winding mechanism 4 are configured... On the same side of the eight-roll mechanism 2, the protective film 8 is released and retrieved, ensuring that the protective film 8 can be smoothly wound onto the eight-roll mechanism 2 along the conveyor path of the electrode film 7. The protective film 8 is made of PE or PP plastic, which has good insulation and mechanical strength. The electrode film 7 is adhered to the protective film 8, making the protective film 8 an important carrier of the electrode film 7. It can effectively bear the tension required for the electrode film traction process, solving the problem of film breakage due to insufficient tension during the traction process, and further improving product quality. At the same time, the electrode film 7 is conveyed to the rear end of the eight-roll mechanism 2 and separates from the protective film 8, and then combines with the current collector 9. The current collector unwinding mechanism 5 and the current collector winding mechanism 6 are respectively set on both sides of the eight-roll mechanism 2, and are responsible for the release and retrieval of the current collector 9. The current collector 9 and the protective film 8 pass through the rear end of the eight-roll mechanism 2 at the same time, and the electrode film 7 is combined on the current collector 9 to form a complete electrode sheet 10. Through continuous pressing and composite processes using the eight-roll mechanism 2, the electrode film 7 and the current collector 9 are tightly bonded together to form an electrode sheet with specific structure and performance, thereby ensuring the product yield.

[0029] Reference Figure 2 In an embodiment of this utility model, the eight-roller mechanism 2 includes a first pressure roller assembly 201, a second pressure roller assembly 202, and a steel roller assembly 203 arranged sequentially from front to back. Each roller assembly consists of multiple rollers, making the eight-roller mechanism 2 a modular design that is easy to disassemble and assemble. During subsequent maintenance, problematic parts can be disassembled and repaired in a targeted manner, avoiding the disassembly and assembly of other parts and increasing maintenance costs. At the same time, the central axes of the first pressure roller assembly 201, the second pressure roller assembly 202, and the steel roller assembly 203 are located on the same horizontal plane, ensuring the stability and continuity of the equipment during operation and improving the accuracy and efficiency of electrode film production.

[0030] Specifically, the first pressure roller assembly 201 includes a first pressure roller 211, a second pressure roller 212, and a third pressure roller 213 with the same roller diameter. The discharge end of the feeding mechanism 1 is located above the first pressure roller 211 and the second pressure roller 212 to press the dry powder material provided by the feeding mechanism 1 into a preliminary electrode film 8. The protective film 8 is wound around the third pressure roller 213, so that the dry powder material can enter the pressing process evenly and continuously, ensuring the tight adhesion between the electrode film 7 and the protective film 8. This allows the protective film 8 to effectively bear the tension required for the traction process of the electrode film 7, solving the problem of film breakage due to insufficient tension during the traction process of the electrode film 7, and improving the product yield.

[0031] Specifically, the second pressure roller assembly 202 includes three traction rollers with the same diameter as the first pressure roller. Both the first pressure roller assembly 201 and the second pressure roller assembly 202 consist of three rollers with the same diameter, which facilitates installation and disassembly and is beneficial for later maintenance. Furthermore, the roller spacing from the first pressure roller assembly 201 to the second pressure roller assembly 202 gradually decreases, which not only enhances the traction force of the electrode film 7 and ensures the stability and continuity of the electrode film 7 during the conveying process, but also allows the electrode film 7 to be gradually thinned along the conveyor belt path using the traction rollers to meet the composite requirements of the electrode film 7 and improve the yield rate.

[0032] Specifically, the steel roller assembly 203 includes two steel rollers, the diameter of which is larger than that of the traction roller, so that the steel rollers can apply greater pressure to the electrode film 7 and the current collector 9, thereby improving the compaction and uniformity of the electrode sheet 10.

[0033] Specifically, the protective film 8 released by the protective film unwinding mechanism 3 enters the eight-roll mechanism 1 from the gap below the second pressure roller 212 and the third pressure roller 213. The electrode film 7 adheres to the protective film 8 and passes around the second pressure roller assembly 202 and the steel roller assembly 203 in sequence. When the protective film 8 passes between the two steel rollers, it separates from the electrode film 7 and passes out and is wound up on the protective film winding mechanism 4. The protective film 8 effectively bears the tension required for the electrode film traction process, solving the problem of film breakage caused by insufficient tension during the traction process of the electrode film 7.

[0034] Specifically, scrapers 11 are provided at the lower ends of the first pressure roller 211 and the third pressure roller 213 and at the upper end of the second pressure roller 212, which helps to remove excess dry powder material and impurities in a timely manner during the pressing process of the electrode film 7, ensuring the quality and consistency of the electrode film 7.

[0035] Reference Figure 1In an embodiment of this utility model, the feeding mechanism 1 includes a filter hopper 101 and a vibrating plate 102. The filter hopper 101 is located at the top of the feeding mechanism 1, and its discharge port is connected to the feed end of the vibrating plate 102. The filter hopper 101 can store and preliminarily filter dry powder materials to ensure that only qualified particles can enter the vibrating plate 102 for further processing. The discharge end of the vibrating plate 102 is located above the first pressure roller 211 and the second pressure roller 212. The vibrating plate 102 generates high-frequency vibration through an internal vibrator, so that the dry powder material forms a thin and uniform material layer on the plate surface. Then, the material layer gradually moves forward under the action of vibration until it is conveyed to the first pressure roller assembly 201 for pressing the electrode film 7. One end of the feeding mechanism 1 is provided with a feeding ladder 12. The feeding ladder 12 usually has a stable support structure and non-slip steps to ensure the safety and stability of the operator when adding dry powder materials. At the same time, the height and tilt angle of the feeding ladder 12 are also carefully designed to make it easy for the operator to push the dry powder materials into the filter hopper.

[0036] Reference Figure 1 In this embodiment of the invention, a passing roller mechanism 13 is provided between the current collector unwinding mechanism 5 and the steel roller. The current collector 9 released by the current collector unwinding mechanism 5 bypasses the passing roller mechanism 13 and passes through the space between the two steel rollers from above the steel roller assembly 203. The electrode film 7 separates from the protective film 8 and combines with the current collector 9 to form an electrode sheet 10. The electrode sheet 10 exits from below the steel roller assembly 203 and is wound onto the protective film winding mechanism 4. This ensures that the current collector 9 maintains stable tension and flatness before entering the steel roller assembly, which helps to achieve a tight composite between the electrode film 7 and the current collector 9 and improves the quality of the electrode sheet 10. A laser thickness gauge 14 is provided between the steel roller and the current collector winding mechanism 6. The laser thickness gauge 14 can measure the thickness of the electrode sheet 10 in real time, which not only ensures the uniformity and consistency of the electrode sheet 10 thickness but also facilitates the operator to adjust the equipment parameters in a timely manner to meet the thickness requirements of different products for the electrode sheet 10.

[0037] 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. An eight-roll dry electrode film forming apparatus characterized by, The application relates to a device for manufacturing electrode film (7), which comprises: a feeding mechanism (1) for providing dry powder material for manufacturing electrode film (7); an eight-roller mechanism (2), wherein the discharging end of the feeding mechanism (1) is arranged at the front end of the eight-roller mechanism (2), and the eight-roller mechanism (2) is used for pressing the dry powder material into electrode film (7) and dragging the electrode film (7) to the rear end of the eight-roller mechanism (2); a protective film unwinding mechanism (3) and a protective film winding mechanism (4) for releasing and winding the protective film (8), wherein the protective film unwinding mechanism (3) and the protective film winding mechanism (4) are arranged on the same side of the eight-roller mechanism (2), the protective film (8) is wound on the eight-roller mechanism (2) along the conveying path of the electrode film (7), the electrode film (7) is adhered to the protective film (8) and is separated from the protective film (8) when being conveyed to the rear end of the eight-roller mechanism (2); a current collector unwinding mechanism (5) and a current collector winding mechanism (6) for releasing and winding the current collector (9), wherein the current collector unwinding mechanism (5) and the current collector winding mechanism (6) are arranged on the two sides of the eight-roller mechanism (2) respectively, the current collector (9) and the protective film (8) pass through the rear end of the eight-roller mechanism (2) at the same time, and the electrode film (7) is compounded on the current collector (9).

2. An eight-roll dry electrode film forming apparatus according to claim 1, characterized in that: The eight-roller mechanism (2) comprises a first compression roller assembly (201), a second compression roller assembly (202) and a steel roller assembly (203) arranged in sequence from front to back, and the central axes of the first compression roller assembly (201), the second compression roller assembly (202) and the steel roller assembly (203) are located on the same horizontal plane.

3. An eight roll dry electrode film forming apparatus according to claim 2, wherein: The first compression roller assembly (201) comprises first, second and third compression rollers (211, 212 and 213) with the same roller diameter, the discharging end of the feeding mechanism (1) is arranged above the first and second compression rollers (211 and 212), and the protective film (8) is wound on the third compression roller (213).

4. An eight roll dry electrode film forming apparatus according to claim 3, wherein: The second compression roller assembly (202) comprises three traction rollers with the same roller diameter, the protective film (8) is wound on the three traction rollers in sequence, the roller diameter of the traction rollers is the same as that of the first compression roller (211), and the roller spacing between the first compression roller assembly (201) and the second compression roller assembly (202) gradually decreases.

5. An eight roll dry electrode film forming apparatus as claimed in claim 4, wherein: The steel roller assembly (203) comprises two steel rollers with a roller diameter larger than that of the traction rollers.

6. An eight roll dry electrode film forming apparatus as claimed in claim 5, wherein: The protective film (8) released by the protective film unwinding mechanism (3) enters the eight-roller mechanism (2) from the gap below the second and third compression rollers (212 and 213), the electrode film (7) is adhered to the protective film (8) and sequentially passes through the second compression roller assembly (202) and the steel roller assembly (203), and the protective film (8) is separated from the electrode film (7) when passing between the two steel rollers and is wound on the protective film winding mechanism (4).

7. An eight roll dry electrode film forming apparatus as defined in claim 5 wherein: A laser thickness gauge (14) is arranged between the steel roller and the current collector winding mechanism (6), and the laser thickness gauge (14) is used for measuring the thickness of the compounded current collector.

8. An eight roll dry electrode film forming apparatus as defined in claim 3 wherein: The lower ends of the first and third compression rollers (211 and 213) and the upper end of the second compression roller (212) are provided with scrapers (11).

9. An eight roll dry electrode film forming apparatus as defined in claim 3 wherein: The feeding mechanism (1) comprises a filtering hopper (101) and a vibrating disc (102), the discharge opening of the filtering hopper (101) is arranged at the feeding end of the vibrating disc (102), and the discharging end of the vibrating disc (102) is arranged above the first and second compression rollers (211 and 212).

10. An eight roll dry electrode film forming apparatus as defined in claim 1 wherein: One end of the feeding mechanism (1) is provided with a feeding ladder (12).

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