A method and apparatus for coating a separator for a lithium ion battery

Abstract

The application discloses a coating equipment for lithium ion batteries, which comprises a platform, a cleaning mechanism and a coating mechanism arranged in the platform, and a drying mechanism arranged on the upper surface of the platform; the cleaning mechanism comprises first scrapers and a collecting box fixedly connected to the inside of the platform, a fixed plate fixedly connected to the inside of the collecting box, two groups of the first scrapers and the fixed plate symmetrically arranged, a fixed block slidingly connected to one side of the first scraper, a moving rod slidingly connected to the inside of the fixed block, a second scraper and a second limiting rod fixedly connected to the circumferential surface of the moving rod, a sliding rod fixedly connected to the surface of the fixed plate, a sliding block slidingly connected to the circumferential surface of the sliding rod, a connecting rod slidingly connected to the inside of the sliding block, and a third scraper fixedly connected to one end of the connecting rod; in the application, the impurities on the upper and lower surfaces of the substrate coated can be cleaned, and the problem that the battery is faulty or the performance is reduced due to the impurities on the surface of the substrate coated is avoided.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and specifically to a method and equipment for coating a separator for lithium-ion batteries. Background Technology

[0002] The coating process for lithium-ion battery electrodes is characterized by high slurry viscosity, thick coating, thin substrate, and high precision requirements. Among existing technologies, air knife coating machines are commonly used. These machines consist of a single-roller paper coating machine and an air knife. The coating roller applies the coating to the substrate, and the airflow from the air knife blows away excess coating to adjust the coating thickness and simultaneously make the coating surface smooth and flat. The advantages of air knife coating are that it can achieve a thicker coating, a more uniform coating layer, and can be used for high-speed coating, making it particularly suitable for lithium battery separator coating.

[0003] Application No.: CN202310101218.5, Patent Title: A Lithium-ion Battery Separator Coating Device and Coating Process, comprising: a drying oven, two first mounting frames, a second mounting frame, a spreading roller, a first motor, a winding roller, a second motor, and a controller. The two first mounting frames are respectively disposed on the left and right sides of the drying oven, and the second mounting frame is disposed to the left of the first mounting frame located on the left side. This lithium-ion battery separator coating device and coating process can automatically open and close the chamber door, facilitating maintenance and aluminum foil installation. The chamber door can also be self-locking after opening. It can circulate and heat the gas inside the drying oven, ensuring uniform temperature and stable airflow, thus preventing the orange peel phenomenon.

[0004] The above-mentioned prior art may have the following technical problems when used: before the coating operation, impurities may be attached to the surface of the substrate. If the impurities are not cleaned, the coated separator will be contaminated, which may lead to battery failure or performance degradation. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems, the present invention aims to provide a method and equipment for coating a separator for lithium-ion batteries to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A coating device for lithium-ion batteries includes a platform, the platform having a cleaning mechanism and a coating mechanism inside, and a drying mechanism on the upper surface of the platform.

[0008] The cleaning mechanism includes a first scraper and a collection box fixedly connected inside the platform. A fixed plate is fixedly connected inside the collection box. The two sets of first scrapers and fixed plates are symmetrically arranged. A fixed block is slidably connected to one side of the first scraper. A moving rod is slidably connected inside the fixed block. A second scraper and a second limiting rod are fixedly connected to the circumferential surface of the moving rod. A sliding rod is fixedly connected to the surface of each fixed plate. A slider is slidably connected to the circumferential surface of each sliding rod. A connecting rod is slidably connected inside each slider. A third scraper is fixedly connected to one end of each connecting rod. A filter plate is fixedly connected inside the collection box. A fourth scraper is slidably connected inside the collection box. A linkage mechanism for driving the reciprocating motion of the third and fourth scrapers is provided at one end of the fixed plate. A moving mechanism for driving the reciprocating motion of the fixed block is provided inside the first scraper.

[0009] Furthermore, the moving mechanism includes a motor fixedly connected to the back of the first scraper, a reciprocating lead screw fixedly connected to the output end of the motor, a moving plate fixedly connected to the circumferential surface of the reciprocating lead screw, one end of the moving plate being fixedly connected to one end of a fixed block, a limiting groove being provided on the surface of the first scraper, and the limiting groove being a parallelogram in shape, and a first limiting rod fixedly connected to the circumferential surface of the moving rod, the first limiting rod being slidably connected to the inside of the limiting groove.

[0010] Furthermore, the linkage mechanism includes a positioning plate slidably connected to one end of the fixed plate. The positioning plate has a positioning hole inside, and the fixed plate has a positioning groove inside. The dimensions of the positioning groove and the positioning hole are matched with the dimensions of the second limiting rod. The lower surface of the positioning plate is rotatably connected to a first connecting rod, and the other end of the first connecting rod is rotatably connected to the upper surface of the slider.

[0011] Furthermore, the lower surface of the positioning plate located below is rotatably connected to a second connecting rod, the inside of the collection box is rotatably connected to a third connecting rod, the upper surface of the fourth scraper is rotatably connected to a fourth connecting rod, and the other ends of the second and fourth connecting rods are rotatably connected to the inside of the third connecting rod.

[0012] Furthermore, the cleaning mechanism also includes a negative pressure fan fixedly connected to the outer wall of the collection box, and a cover is rotatably connected to the back of the collection box.

[0013] Furthermore, a first spring is fixedly connected between the second scraper and the fixed block, a second spring is fixedly connected between the circumferential surface of the slide rod and one end of the slider, and a third spring is fixedly connected between the third scraper and the slider.

[0014] Furthermore, the coating mechanism includes a feeding roller, a receiving roller, a coating roller, and an extrusion roller rotatably connected inside the main body. A liquid storage tank and an air knife are fixedly connected inside the main body, and multiple limiting rollers are rotatably connected inside the main body.

[0015] Furthermore, the drying mechanism includes a sealed chamber fixedly connected to the upper surface of the platform, a hot air blower fixedly connected to the upper surface of the sealed chamber, an exhaust hood fixedly connected to the inside of the sealed chamber, the output end of the hot air blower fixedly connected to the inside of the exhaust hood, and a negative pressure pump fixedly connected to the lower surface of the sealed chamber.

[0016] A coating method using a coating equipment for lithium-ion batteries, comprising the following specific steps:

[0017] Step 1: The substrate coating is fed by the feeding roller, and the substrate coating moves to the cleaning mechanism to clean the impurities on its surface;

[0018] Step 2: The substrate coating process is carried out at the coating roller and extrusion roller. Excess coating is blown away by an air knife to adjust the coating thickness.

[0019] Step 3: After coating is completed, the coated surface is dried by the drying mechanism, and the substrate coating is moved to the other side to coat the other side.

[0020] Step 4: After the other side is coated, it is dried again by the drying mechanism and then wound up by the take-up roller.

[0021] The beneficial effects of this invention are:

[0022] 1. This invention employs a cleaning mechanism. Two first scrapers clean impurities from the upper and lower surfaces of the substrate coating, preventing battery malfunctions or performance degradation caused by impurities on the substrate coating surface. The moving mechanism then drives the second scraper to push impurities from the first scraper into the collection box, allowing for centralized placement of impurities. This reduces the workload of subsequent cleaning of the first scraper and improves production efficiency. When the second scraper reaches the third scraper, it drives a linkage mechanism, causing the third and fourth scrapers to move synchronously. The third scraper cleans impurities from the surface of the second scraper, removing those difficult to remove and preventing wear and damage. Simultaneously, impurities are adsorbed onto the filter plate by negative pressure generated by the negative pressure fan. The fourth scraper cleans the accumulated impurities on the filter plate surface, preventing potential clogging and ensuring continuous production and quality.

[0023] 2. The present invention adopts a moving mechanism. When the second scraper is reset after cleaning the impurities on the surface of the first scraper, the lower surface of the second scraper will move away from the substrate coating. This avoids the problem of pushing the impurities on the surface of the first scraper to the other side and causing accumulation when resetting. At the same time, it ensures that the impurities can fall into the inside of the collection box, thereby reducing the workload of subsequent cleaning.

[0024] 3. By adopting a drying mechanism, hot air is generated by a hot air blower. At this time, the exhaust hood delivers the airflow to the substrate coating surface, so that both sides of the substrate coating can be dried. The drying airflow is extracted by a negative pressure pump and sent back to the inside of the hot air blower, thus realizing hot air circulation and improving coating efficiency. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a cross-sectional view of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the cleaning mechanism of the present invention;

[0028] Figure 3 This is a structural cross-sectional view of the cleaning mechanism of the present invention;

[0029] Figure 4 This is a structural schematic diagram of the cleaning mechanism of the present invention from another perspective;

[0030] Figure 5 This is the invention Figure 2 A magnified view of part A in the image;

[0031] Figure 6 This is the present invention. Figure 3 A magnified view of part B in the image.

[0032] In the diagram: 1. Platform; 2. First scraper; 3. Reciprocating screw; 4. Moving plate; 5. Fixed block; 6. Moving rod; 7. First limiting rod; 8. Second limiting rod; 9. Second scraper; 10. First spring; 11. Limiting groove; 12. Fixed plate; 13. Positioning plate; 14. Positioning hole; 15. Positioning groove; 16. First connecting rod; 17. Sliding rod; 18. Second spring; 19. Sliding block; 20. Connecting rod; 21. Third spring; 22. Third scraper; 23. Second connecting rod; 24. Third connecting rod; 25. Fourth connecting rod; 26. Fourth scraper; 27. Filter plate; 28. Negative pressure fan; 29. ​​Collection box; 30. Cover; 31. Feeding roller; 32. Receiving roller; 33. Liquid storage tank; 34. Coating roller; 35. Extrusion roller; 36. Air knife; 37. Limiting roller; 38. Sealing chamber; 39. Hot air blower; 40. Exhaust hood; 41. Motor; 42. Negative pressure pump. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-6 As shown, a coating device for lithium-ion batteries includes a platform 1, with a cleaning mechanism and a coating mechanism inside the platform 1, and a drying mechanism on the upper surface of the platform 1.

[0035] The cleaning mechanism includes a first scraper 2 and a collection box 29 fixedly connected inside the platform 1. A fixed plate 12 is fixedly connected inside the collection box 29. The two sets of first scrapers 2 and fixed plates 12 are symmetrically arranged. A fixed block 5 is slidably connected to one side of the first scraper 2. A moving rod 6 is slidably connected inside the fixed block 5. A second scraper 9 and a second limiting rod 8 are fixedly connected to the circumferential surface of the moving rod 6. A sliding rod 17 is fixedly connected to the surface of the fixed plate 12. A slider 19 is slidably connected to the circumferential surface of the sliding rod 17. A connecting rod 20 is slidably connected inside the slider 19. A third scraper 22 is fixedly connected to one end of the connecting rod 20. A filter plate 27 is fixedly connected inside the collection box 29. A fourth scraper 26 is slidably connected inside the collection box 29. A linkage mechanism for driving the reciprocating motion of the third scraper 22 and the fourth scraper 26 is provided at one end of the fixed plate 12. A moving mechanism for driving the reciprocating motion of the fixed block 5 is provided inside the first scraper 2.

[0036] When using this device, the coating mechanism drives the substrate coating to move. When the substrate coating moves to the first scraper 2, the first scraper 2 cleans the impurities on the upper and lower surfaces of the substrate coating to ensure that the substrate coating is not contaminated. At the same time, the moving mechanism drives the second scraper 9 to reciprocate. The movement of the second scraper 9 cleans the impurities that are stuck on one side of the first scraper 2. The second scraper 9 pushes the impurities into the collection box 29. When the second scraper 9 and the third scraper 22 come into contact, the second scraper 9 drives the linkage mechanism to move. The linkage mechanism drives the third scraper 22 to slide laterally and clean the impurities attached to the surface of the second scraper 9. At the same time, the linkage mechanism also drives the fourth scraper 26 to move inside the collection box 29. The fourth scraper 26 cleans the impurities that remain on the surface of the filter plate 27 to prevent the filter holes from clogging. It can also push the impurities to one side to facilitate subsequent cleaning operations.

[0037] The substrate is coated after passing through a cleaning mechanism, and the coating is dried by a drying mechanism after the coating is completed.

[0038] The moving mechanism includes a motor 41 fixedly connected to the back of the first scraper 2. A reciprocating lead screw 3 is fixedly connected to the output end of the motor 41. A moving plate 4 is fixedly connected to the circumferential surface of the reciprocating lead screw 3. One end of the moving plate 4 is fixedly connected to one end of the fixed block 5. A limiting groove 11 is provided on the surface of the first scraper 2, and the shape of the limiting groove 11 is set as a parallelogram. A first limiting rod 7 is fixedly connected to the circumferential surface of the moving rod 6. The first limiting rod 7 and the limiting groove 11 are slidably connected inside the first limiting rod 7.

[0039] When the motor 41 is working, it drives the reciprocating screw 3 to rotate, causing the moving plate 4 to reciprocate on the circumferential surface of the reciprocating screw 3. Simultaneously, the moving plate 4 drives the fixed block 5 to slide synchronously. The fixed block 5 then drives the moving rod 6 and the second scraper 9 to reciprocate on the surface of the first scraper 2. When the moving rod 6 slides and the first limiting rod 7 is located in the lower parallel section of the limiting groove 11, the lower surface of the second scraper 9 is in contact with the substrate coating surface. This not only cleans impurities attached to the first scraper 2 but also cleans impurities on the substrate coating surface. When the second scraper 9 returns to its original position with the moving plate 4, the first limiting rod 7 is located in the upper parallel section of the limiting groove 11, causing the moving rod 6 to rise and move the lower surface of the second scraper 9 away from the substrate coating. This prevents impurities on the surface of the first scraper 2 from being pushed to the other side and accumulating during resetting, while ensuring that impurities fall into the collection box 29, reducing the workload of subsequent cleaning.

[0040] The linkage mechanism includes a positioning plate 13 slidably connected to one end of the fixed plate 12. The positioning plate 13 has a positioning hole 14 inside, and the fixed plate 12 has a positioning groove 15 inside. The dimensions of the positioning groove 15 and the positioning hole 14 are matched with the dimensions of the second limiting rod 8. The lower surface of the positioning plate 13 is rotatably connected to the first connecting rod 16, and the other end of the first connecting rod 16 is rotatably connected to the upper surface of the slider 19.

[0041] When the second scraper 9 and the third scraper 22 come into contact, the second limiting rod 8 enters the positioning hole 14 inside the positioning plate 13. When the moving rod 6 slides inside the fixed block 5, the second limiting rod 8 is limited by the positioning hole 14 and drives the positioning plate 13 to slide on the surface of the fixed plate 12. When the positioning plate 13 slides, it drives the first connecting rod 16 to rotate. The first connecting rod 16 can pull the slider 19 to slide. The slider 19 can drive the connecting rod 20 inside it to move. The connecting rod 20 then drives the third scraper 22 to slide, so that the third scraper 22 can slide laterally at one end of the second scraper 9 to clean the impurities attached to the surface of the second scraper 9. At the same time, the second scraper 9 moves forward and squeezes the third scraper 22, so that the third scraper 22 drives the connecting rod 20 to move inside the slider 19, so that the third scraper 22 can fit tightly with the second scraper 9 to increase the cleaning effect on its surface and prevent impurities from causing wear and damage to the second scraper 9.

[0042] The lower surface of the positioning plate 13 located below is rotatably connected to the second link 23, the inside of the collection box 29 is rotatably connected to the third link 24, the upper surface of the fourth scraper 26 is rotatably connected to the fourth link 25, and the other ends of the second link 23 and the fourth link 25 are rotatably connected to the inside of the third link 24.

[0043] When the positioning plate 13 at the bottom moves, it can also drive the second link 23 to rotate. The second link 23 squeezes the third link 24, causing the third link 24 to rotate and drive the fourth link 25 to rotate. The fourth link 25 can then drive the fourth scraper 26 to move synchronously to clean the impurities on the filter plate 27, thus preventing the filter holes of the filter plate 27 from becoming clogged and affecting the efficiency of impurity collection.

[0044] The cleaning mechanism also includes a negative pressure fan 28 fixedly connected to the outer wall of the collection box 29, which can generate negative pressure to draw impurities into the collection box 29 for centralized processing. A cover 30 is rotatably connected to the back of the collection box 29, which is convenient to open and clean the impurities inside the collection box 29.

[0045] A first spring 10 is fixedly connected between the second scraper 9 and the fixed block 5. A second spring 18 is fixedly connected between the circumferential surface of the slide rod 17 and one end of the slider 19. A third spring 21 is fixedly connected between the third scraper 22 and the slider 19.

[0046] The first spring 10 ensures that the second scraper 9 and the substrate coating surface are tightly adhered when the first limiting rod 7 is in the parallel section below the limiting groove 11. It also moves the second scraper 9 away from the substrate coating when the first limiting rod 7 slides quickly from the parallel section below the limiting groove 11 to the parallel section above. The second spring 18 allows the positioning plate 13 and slider 19 to reset after the second limiting rod 8 disengages from the positioning hole 14. When the second spring 18 pushes the slider 19 to reset, the collision of the slider 19 generates vibration, which is transmitted to the third scraper 22. This causes impurities adhering to the surface of the third scraper 22 to be shaken off by the vibration, thus achieving the cleaning operation on the surface of the third scraper 22. The third spring 21 allows the third scraper 22 at one end of the connecting rod 20 to reset when the second scraper 9 is away from the third scraper 22 due to elasticity.

[0047] The coating mechanism includes a feeding roller 31, a receiving roller 32, a coating roller 34, and an extrusion roller 35 rotatably connected inside the main body. A liquid storage tank 33 and an air knife 36 are fixedly connected inside the main body. Multiple limiting rollers 37 are rotatably connected inside the main body.

[0048] The feeding roller 31 rotates, and the substrate coating is fixed by the limiting roller 37 and then slides stably to the coating roller 34 and the extrusion roller 35. The coating roller 34 and the coating inside the liquid storage tank 33 come into contact with the coating material to perform the coating operation on the substrate. After the coating is completed, the air knife 36 blows away the excess coating material to adjust the coating thickness, thus completing the coating operation on one side of the substrate. At the same time, it moves to the coating roller 34 on the other side to perform the coating operation on the other side. After the coating and drying are completed, the substrate coating is wound up through the take-up tube.

[0049] The drying mechanism includes a sealed chamber 38 fixedly connected to the upper surface of the platform 1. A hot air blower 39 is fixedly connected to the upper surface of the sealed chamber 38. An exhaust hood 40 is fixedly connected inside the sealed chamber 38. The output end of the hot air blower 39 is fixedly connected to the inside of the exhaust hood 40. A negative pressure pump 42 is fixedly connected to the lower surface of the sealed chamber 38.

[0050] After coating, the substrate enters the sealed chamber 38 and is vented into the exhaust hood 40 by the hot air blower 39. The exhaust hood 40 dries the coating on the surface of the substrate. Then, the hot air is extracted by negative pressure and sent back into the hot air blower 39 to achieve hot air circulation drying.

[0051] A coating method using a coating equipment for lithium-ion batteries, comprising the following specific steps:

[0052] Step 1: The substrate coating is fed by the feeding roller 31, and the substrate coating moves to the cleaning mechanism to clean the impurities on its surface;

[0053] Step 2: The substrate coating machine moves to the coating roller 34 and the extrusion roller 35 to perform the coating work on the substrate. The air knife 36 blows away the excess coating to adjust the coating thickness.

[0054] Step 3: After coating is completed, the coated surface is dried by the drying mechanism, and the substrate coating is moved to the other side to coat the other side.

[0055] Step 4: After the other side is coated, it is dried again by the drying mechanism and then wound up by the take-up roller 32.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A coating apparatus for lithium-ion batteries, characterized in that, Includes a platform (1), the platform (1) is provided with a cleaning mechanism and a coating mechanism inside, and a drying mechanism is provided on the upper surface of the platform (1); The cleaning mechanism includes a first scraper (2) and a collection box (29) fixedly connected inside the platform (1). A fixed plate (12) is fixedly connected inside the collection box (29). The two sets of first scrapers (2) and fixed plates (12) are symmetrically arranged. A fixed block (5) is slidably connected to one side of the first scraper (2). A moving rod (6) is slidably connected inside the fixed block (5). A second scraper (9) and a second limiting rod (8) are fixedly connected to the circumferential surface of the moving rod (6). Sliding rods (17) are fixedly connected to the surface of the fixed plate (12). The circumferential surface of the first scraper (2) is slidably connected to a slider (19), and the inside of the slider (19) is slidably connected to a connecting rod (20). One end of the connecting rod (20) is fixedly connected to a third scraper (22). The inside of the collection box (29) is fixedly connected to a filter plate (27). The inside of the collection box (29) is slidably connected to a fourth scraper (26). One end of the fixed plate (12) is provided with a linkage mechanism for driving the third scraper (22) and the fourth scraper (26) to reciprocate. The inside of the first scraper (2) is provided with a moving mechanism for driving the fixed block (5) to reciprocate. The moving mechanism includes a motor (41) fixedly connected to the back of the first scraper (2), a reciprocating screw (3) fixedly connected to the output end of the motor (41), a moving plate (4) fixedly connected to the circumferential surface of the reciprocating screw (3), one end of the moving plate (4) and one end of the fixed block (5) fixedly connected, a limiting groove (11) is provided on the surface of the first scraper (2), and the shape of the limiting groove (11) is set as a parallelogram, a first limiting rod (7) is fixedly connected to the circumferential surface of the moving rod (6), and the first limiting rod (7) and the limiting groove (11) are slidably connected inside; The linkage mechanism includes a positioning plate (13) slidably connected to one end of a fixed plate (12). The positioning plate (13) has a positioning hole (14) inside, and the fixed plate (12) has a positioning groove (15) inside. The dimensions of the positioning groove (15) and the positioning hole (14) are matched with the dimensions of the second limiting rod (8). The lower surface of the positioning plate (13) is rotatably connected to a first connecting rod (16), and the other end of the first connecting rod (16) is rotatably connected to the upper surface of the slider (19).

2. The coating equipment for lithium-ion batteries according to claim 1, characterized in that, The lower surface of the positioning plate (13) located below is rotatably connected to a second link (23), the inside of the collection box (29) is rotatably connected to a third link (24), the upper surface of the fourth scraper (26) is rotatably connected to a fourth link (25), and the other ends of the second link (23) and the fourth link (25) are rotatably connected to the inside of the third link (24).

3. The coating equipment for lithium-ion batteries according to claim 1, characterized in that, The cleaning mechanism also includes a negative pressure fan (28) fixedly connected to the outer wall of the collection box (29), and a cover (30) is rotatably connected to the back of the collection box (29).

4. The coating equipment for lithium-ion batteries according to claim 1, characterized in that, A first spring (10) is fixedly connected between the second scraper (9) and the fixed block (5). A second spring (18) is fixedly connected between the circumferential surface of the slide rod (17) and one end of the slider (19). A third spring (21) is fixedly connected between the third scraper (22) and the slider (19).

5. A coating device for lithium-ion batteries according to claim 1, characterized in that, The coating mechanism includes a feeding roller (31), a receiving roller (32), a coating roller (34), and an extrusion roller (35) rotatably connected inside the main body. A liquid storage tank (33) and an air knife (36) are fixedly connected inside the main body. Multiple limiting rollers (37) are rotatably connected inside the main body.

6. A coating device for lithium-ion batteries according to claim 1, characterized in that, The drying mechanism includes a sealed chamber (38) fixedly connected to the upper surface of the platform (1), a hot air blower (39) fixedly connected to the upper surface of the sealed chamber (38), an exhaust hood (40) fixedly connected inside the sealed chamber (38), the output end of the hot air blower (39) and the inside of the exhaust hood (40) fixedly connected, and a negative pressure pump (42) fixedly connected to the lower surface of the sealed chamber (38).

7. A coating method for a coating apparatus for lithium-ion batteries according to any one of claims 1 to 6, characterized in that, The specific steps are as follows: Step 1: The substrate coating is fed through the feeding roller (31). The substrate coating moves to the cleaning mechanism to clean the impurities on its surface, specifically: Start the motor (41), which drives the reciprocating screw (3) to rotate, causing the moving plate (4) to reciprocate along the reciprocating screw (3). The moving plate (4) drives the moving rod (6) and the second scraper (9) to reciprocate through the fixed block (5). During the cleaning stroke of the second scraper (9), the first limiting rod (7) slides along the lower parallel section of the parallelogram limiting groove (11), causing the second scraper (9) to adhere to the substrate surface and push the impurities remaining on the side of the first scraper (2) into the collection box (29). During the reset stroke of the second scraper (9), the first limiting rod (7) slides along the upper parallel section of the limiting groove (11), causing the moving rod (6) to drive the second scraper (9) away from the substrate surface. When the second scraper (9) moves to the third scraper (22), the second limiting rod (8) enters the positioning hole (14) of the positioning plate (13) and drives the positioning plate (13) to slide along the fixed plate (12). The positioning plate (13) drives the first connecting rod (16) to rotate. The first connecting rod (16) drives the slider (19) to slide along the sliding rod (17). The slider (19) drives the third scraper (22) to move laterally through the connecting rod (20), so that the third scraper (22) cleans the impurities attached to the surface of the second scraper (9). Step 2: The substrate coating is carried out at the coating roller (34) and the extrusion roller (35). The air knife (36) blows away the excess coating to adjust the coating thickness. Step 3: After coating is completed, the coated surface is dried by the drying mechanism, and the substrate coating is moved to the other side to coat the other side. Step 4: After the other side is coated, it is dried again by the drying mechanism and then wound up by the take-up roller (32).

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