Battery coating device

Abstract

The utility model discloses a battery coating device which comprises slurry, an attachment roller and a coating roller, the attachment roller is horizontally and rotatably arranged, the bottom of a roller body is immersed in the slurry, the coating roller is horizontally and rotatably arranged, the roller body is higher than the liquid level line of the slurry, and the attachment roller and the coating roller are distributed in parallel and close to each other. And a gap is reserved between the two roller bodies. According to the utility model, the slurry can be fed along with the rotation of the attachment roller and gradually fed and attached to the coating roller along with the synchronous rotation of the two roller bodies, and the redundant slurry exceeding the width of the gap is extruded and discharged, so that the thickness of the slurry which passes through the gap and is finally attached to the coating roller is reduced to the width of the gap; and then the capillary material is coated on the strip through the coating roller, so that the coating thickness is reduced, and meanwhile, the problems that the capillary material is not durable and is inconvenient to replace due to abrasion in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery coating, in particular to a battery coating device. Background Art

[0002] Lithium-ion batteries have become the first choice for the development of power batteries due to their advantages such as high energy density, light volume, small weight, environmental protection and no pollution. The coating process is an important process in the production of lithium-ion batteries. The coating technology of the coating machine directly affects the performance of lithium-ion batteries. Coating is to evenly apply the positive electrode slurry or negative electrode slurry required for the manufacture of lithium-ion batteries to the substrate.

[0003] In the prior art, coating is generally carried out by direct coating through slit discharge. For example, a Chinese utility model patent with patent announcement number CN220295080U discloses a battery coating device, including a coating die head, and the coating die head is provided with a coating lip. However, the thickness of coating using this device is usually thicker and does not meet the ultra-thin process requirements. In response to the above problems, a Chinese utility model patent with patent announcement number CN217314167U discloses a battery coating mechanism, which uses capillary material adsorption to adsorb the slurry and then coats it to achieve ultra-thin coating. However, in actual work, the capillary material is susceptible to wear after long-term use, which will cause the gap between it and the coating roller to gradually increase, affecting the adhesion of the slurry. The height of the capillary material needs to be frequently adjusted to offset the error, which is inconvenient to operate. Utility Model Content

[0004] The utility model provides a battery coating device which can be used for a long time and is relatively convenient, and can solve at least one of the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a battery coating device, comprising slurry, an attachment roller and a coating roller, the attachment roller being rotatably arranged horizontally, the bottom of the roller body being immersed in the slurry, the coating roller being rotatably arranged horizontally, the roller body being higher than the liquid surface line of the slurry, the attachment roller being parallel and closely distributed to the coating roller, and a gap being left between the two roller bodies.

[0006] Furthermore, the gap width is measured in micrometers, and the width is adjustable, with the total width not exceeding 10 micrometers.

[0007] Furthermore, it also includes a baffle, which is obliquely arranged below the coating roller, and a slot is opened at one end of the baffle that is inclined downward, and the slot is locked and matched with the attachment roller. The slot includes a scraping wall portion and a separation wall portion, and the scraping wall portion is located at both ends of the inner wall of the slot and is fitted with both ends of the roller body of the attachment roller. The separation wall portion is located on the inner side of the inner wall of the slot and is spaced apart from the surface of the roller body of the attachment roller, and the spacing size is set to 1 mm, and the error size is ±0.5 mm.

[0008] Furthermore, it also includes a driving assembly, which includes a driven gear, a driving gear, a transmission gear, a driven pulley, a driving pulley, a belt and a motor;

[0009] The driving gear and the driven pulley are respectively coaxially installed at one end of the coating roller, and the driven gear is installed at the same end of the attachment roller. The driving pulley is coaxially installed with the motor, and the motor is used to drive the driving pulley to rotate. The belt is sleeved on the driving pulley and the driven pulley to drive the pulleys to rotate synchronously. The transmission gear is meshingly installed between the driving gear and the driven gear to drive the gears to rotate synchronously, and then driven by the motor, the attachment roller and the coating roller are driven to rotate synchronously.

[0010] Furthermore, it also includes a mounting frame, the attachment roller and the coating roller are installed at different heights on a side of the mounting frame facing the slurry, and the drive assembly is installed on the other side of the mounting frame away from the slurry.

[0011] Furthermore, it also includes a liquid tank and a liquid replenishing tank, the liquid tank is used to hold the slurry, the attachment roller and the coating roller are both located above the liquid tank, and the liquid replenishing tank is connected to the liquid tank and is used to replenish the slurry to the liquid tank.

[0012] Furthermore, it also includes a liquid level sensor and a solenoid valve. The liquid level sensor is installed in the liquid tank and is used to monitor the liquid level of the slurry in the liquid tank in real time. The solenoid valve is installed on the connecting pipeline between the liquid replenishing tank and the liquid tank, and is electrically connected to the liquid level sensor to control the opening and closing of the connecting pipeline.

[0013] The beneficial effects of the utility model are embodied in:

[0014] 1. In the utility model, the attachment roller is horizontally rotatable, the bottom of the roller body is immersed in the slurry, the coating roller is horizontally rotatable, the roller body is higher than the slurry liquid surface line, and the attachment roller and the coating roller are parallel and closely distributed, and a gap with adjustable width is left between the two roller bodies. The slurry can be loaded with the rotation of the attachment roller, and gradually loaded and attached to the coating roller with the synchronous rotation of the two roller bodies. The excess slurry exceeding the gap width is squeezed out, so that the thickness of the slurry passing through the gap and finally attached to the coating roller is reduced to the width of the gap, and then coated on the strip through the coating roller, thereby achieving the reduction of the coating thickness while also solving the problems of poor durability and inconvenient replacement caused by the wear of capillary materials in the prior art.

[0015] 2. In the utility model, the baffle is obliquely arranged below the coating roller, and a slot is provided at one end of the baffle which is inclined downward, and the slot is matched with the attachment roller. During the rotation and feeding process of the attachment roller, the scraping wall portion can scrape off the excess slurry adhered to both ends of the roller body, and the isolation wall portion is spaced apart from the roller body to avoid affecting the normal rotation of the attachment roller and the normal feeding of the attachment roller. At the same time, due to the inclined setting of the baffle, the scraped slurry can drip back to the original liquid surface for recovery and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0017] Figure 2 It is a schematic diagram of the cooperation between the attachment roller and the coating roller in the embodiment of the utility model.

[0018] Figure 3 It is a top view of the cooperation between the attachment roller and the baffle plate of the embodiment of the utility model.

[0019] The components in the accompanying drawings are marked as follows: 1. liquid tank; 2. slurry; 3. liquid level sensor; 4. solenoid valve; 5. liquid replenishing tank; 6. attachment roller; 7. coating roller; 8. baffle; 9. mounting frame; 10. driving assembly; 11. driven gear; 12. driving gear; 13. transmission gear; 14. driven pulley; 15. driving pulley; 16. belt; 17. motor; 18. strip; 19. gap; 20. slot; 2001. wall hanging portion; 2002. isolation wall portion. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the utility model, the directional indication is only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] See also Figure 1-2 The embodiment of the utility model provides a battery coating device, including a slurry 2, an attachment roller 6 and a coating roller 7, wherein the attachment roller 6 is rotatably arranged horizontally, and the bottom of the roller body is immersed in the slurry 2, and the coating roller 7 is rotatably arranged horizontally, and the roller body is higher than the liquid surface line of the slurry 2, and the attachment roller 6 and the coating roller 7 are parallel and closely distributed, and a gap 19 is left between the two roller bodies;

[0022] The slurry 2 is evenly adhered as the attachment roller 6 rotates, and is adhered to the coating roller 7 as the two rollers rotate synchronously, and the excess slurry 2 exceeding the width of the gap 19 is squeezed out, so that the thickness of the slurry 2 adhered to the coating roller 7 is equal to the width of the gap 19, and the battery strip 18 is adhered to the surface of the coating roller 7 and coated.

[0023] In the utility model, the attachment roller is horizontally rotatable, the bottom of the roller body is immersed in the slurry, the coating roller is horizontally rotatable, the roller body is higher than the slurry liquid surface line, and the attachment roller and the coating roller are parallel and closely distributed, and a gap with adjustable width is left between the two roller bodies. The slurry can be loaded with the rotation of the attachment roller, and gradually loaded and attached to the coating roller with the synchronous rotation of the two roller bodies. The excess slurry exceeding the gap width is squeezed and discharged, so that the thickness of the slurry passing through the gap and finally attached to the coating roller is reduced to the width of the gap, and then coated on the strip through the coating roller, thereby achieving the reduction of the coating thickness while also solving the problems of poor durability and inconvenient replacement caused by the wear of the capillary material in the prior art.

[0024] See also Figure 2In this embodiment, the width of the gap 19 is in microns, and the width is adjustable, and the total width does not exceed 10 microns. In this design, the excess slurry 2 exceeding the width of the gap 19 is squeezed out, or adsorbed back to the attachment roller 6, or drips back to the original liquid surface, so that the thickness of the slurry 2 passing through the gap 19 and finally attached to the coating roller 7 is reduced to the width of the gap 18, and can then be coated on the strip 18 through the coating roller 7, thereby achieving ultra-thin coating. At the same time, the width of the gap 19 can be changed by changing the relative position of the attachment roller 6 and the coating roller 7.

[0025] See also Figure 1-3 In the present embodiment, a baffle plate 8 is further included, wherein the baffle plate 8 is obliquely arranged below the coating roller 7, and a card slot 20 is opened at one end of the baffle plate 8 which is inclined downward, and the card slot 20 is carded and matched with the attachment roller 6, and the card slot 20 includes a scraping wall portion 2001 and an isolation wall portion 2002, wherein the scraping wall portion 2001 is located at both ends of the inner wall of the card slot 20 and is fitted with both ends of the roller body of the attachment roller 6, and the isolation wall portion 2002 is located on the inner side of the inner wall of the card slot 20 and is spaced apart from the roller body surface of the attachment roller 6, and the spacing size is set to 1 mm, and the error size is ±0.5 mm. With such a design, during the rotation and feeding process of the attachment roller 6, the scraping wall portion 2001 can scrape off the excess slurry 2 adhered to the two ends of the roller body. At the same time, since the baffle 8 is set at an angle, the scraped slurry 2 can drip back into the original liquid surface. The isolation wall portion 2002 maintains a distance from the roller body to avoid affecting the normal rotation of the attachment roller 6 and the normal feeding of the attachment roller 6. It should be noted that the baffle 8 in the present application should be made of anti-corrosion material, such as stainless steel, to avoid erosion by the slurry 2 during long-term operation.

[0026] See also Figure 1 In this embodiment, a driving assembly 10 is further included, wherein the driving assembly 10 includes a driven gear 11, a driving gear 12, a transmission gear 13, a driven pulley 14, a driving pulley 15, a belt 16 and a motor 17;

[0027] The driving gear 12 and the driven pulley 14 are coaxially mounted on one end of the coating roller 7, respectively, and the driven gear 11 is mounted on the same end of the attachment roller 6. The driving pulley 15 is coaxially mounted with the motor 17, and the motor 17 is used to drive the driving pulley 15 to rotate. The belt 16 is sleeved on the driving pulley 15 and the driven pulley 14 to drive the pulleys to rotate synchronously. The transmission gear 13 is meshed and mounted between the driving gear 12 and the driven gear 11 to drive the gears to rotate synchronously, and then, under the drive of the motor 17, the attachment roller 6 and the coating roller 7 are driven to rotate synchronously. With this design, the driving assembly 10 is driven by electricity to realize the synchronous rotation of the attachment roller 6 and the coating roller 7. It should be noted that the driving assembly 10 in the present application has multiple implementation forms. In this embodiment, only one implementation form of pulley and gear transmission is provided. The other implementation forms, such as connecting rod transmission, belong to the protection scope of the present application and are not described one by one here.

[0028] See also Figure 1 In this embodiment, a mounting frame 9 is further included, and the attachment roller 6 and the coating roller 7 are installed at different heights on one side of the mounting frame 9 facing the slurry 2, and the drive assembly 10 is installed on the other side of the mounting frame 9 away from the slurry 2. With this design, the mounting frame 9 provides a platform for the installation of the attachment roller 6, the coating roller 7 and the drive assembly 10, and isolates the drive assembly 10 from the slurry 2 to protect the drive assembly 10 from being corroded by the slurry 2. It should be noted that the mounting frame 9 in this application should be made of anti-corrosion material, such as stainless steel, to avoid being corroded by the slurry 2 during long-term operation.

[0029] See also Figure 1 In this embodiment, it also includes a liquid tank 1 and a liquid replenishing tank 5. The liquid tank 1 is used to hold the slurry 2. The attachment roller 6 and the coating roller 7 are both located above the liquid tank 1. The liquid replenishing tank 5 is connected to the liquid tank 1 and is used to replenish the slurry 2 to the liquid tank 1. In this design, coating is to evenly apply the positive electrode slurry or negative electrode slurry required for lithium-ion battery manufacturing, that is, the slurry 2 in this application, to the substrate, that is, the strip 18 in this application. The slurry 2 is injected into the liquid tank 1 by the liquid replenishing tank 5, and the liquid level of the slurry 2 in the liquid tank 1 is adjustable. The bottom of the roller body of the attachment roller 6 is immersed in the slurry 2 for rotating attachment and feeding. The roller body of the coating roller 7 is upwardly away from the liquid level of the slurry 2 for approaching the attachment roller 6 and rotating attachment and feeding.

[0030] See also Figure 1In this embodiment, it also includes a liquid level sensor 3 and a solenoid valve 4. The liquid level sensor 3 is installed in the liquid tank 1 to monitor the liquid level of the slurry 2 in the liquid tank 1 in real time. The solenoid valve 4 is installed on the connecting pipeline between the liquid replenishing tank 5 and the liquid tank 1, and is electrically connected to the liquid level sensor 3 to control the on-off of the connecting pipeline. In this design, when the liquid level sensor 3 detects that the liquid level of the slurry 2 in the liquid tank 1 is lower than the low threshold, the solenoid valve 4 opens the connecting pipeline. On the contrary, when the liquid level sensor 3 detects that the liquid level of the slurry 2 in the liquid tank 1 reaches the high threshold, the solenoid valve 4 closes the connecting pipeline to achieve automatic liquid replenishment or liquid cutoff. It should be noted that in this application, the liquid level sensor 3 and the solenoid valve 4 are both standard parts that can be purchased in the prior art, and no special requirements are made for the specific models.

[0031] In summary, in the present invention, the attachment roller is horizontally rotatable, the bottom of the roller body is immersed in the slurry, the coating roller is horizontally rotatable, the roller body is higher than the slurry liquid surface line, and the attachment roller and the coating roller are parallel and closely distributed, and a gap with adjustable width is left between the two roller bodies. The slurry can be loaded with the rotation of the attachment roller, and gradually loaded and attached to the coating roller with the synchronous rotation of the two roller bodies, and the excess slurry exceeding the gap width is squeezed out, so that the thickness of the slurry passing through the gap and finally attached to the coating roller is reduced to the width of the gap, and then coated on the strip through the coating roller, thereby achieving the reduction of the coating thickness while also solving the problems of poor durability and inconvenient replacement caused by the wear of the capillary material in the prior art;

[0032] The baffle is arranged obliquely below the coating roller, and a slot is provided at the downwardly inclined end of the baffle, which is engaged and matched with the attachment roller. During the rotation and feeding process of the attachment roller, the scraping wall portion can scrape off the excess slurry adhered to the two ends of the roller body, and the isolation wall portion keeps a distance from the roller body to avoid affecting the normal rotation of the attachment roller and the normal feeding of the attachment roller. At the same time, due to the inclined setting of the baffle, the scraped slurry can drip back to the original liquid surface for recovery and collection.

[0033] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery coating device, characterized in that: The invention comprises a slurry (2), an attachment roller (6) and a coating roller (7), wherein the attachment roller (6) is rotatably arranged horizontally, and the bottom of the roller body is immersed in the slurry (2); the coating roller (7) is rotatably arranged horizontally, and the roller body is higher than the liquid surface line of the slurry (2); the attachment roller (6) and the coating roller (7) are arranged parallel and closely, and a gap (19) is left between the two roller bodies.

2. The battery coating device according to claim 1, characterized in that: The width of the gap (19) is in micrometers and is adjustable, with the total width not exceeding 10 micrometers.

3. The battery coating device according to claim 1, characterized in that: The invention also comprises a baffle plate (8), wherein the baffle plate (8) is arranged obliquely below the coating roller (7), and a slot (20) is provided at one end of the baffle plate (8) which is inclined downward, wherein the slot (20) is engaged and matched with the attachment roller (6), and the slot (20) comprises a scraping wall portion (2001) and an isolation wall portion (2002), wherein the scraping wall portion (2001) is located at the two ends of the inner wall of the slot (20) and is arranged to fit the two ends of the roller body of the attachment roller (6), and the isolation wall portion (2002) is located on the inner side of the inner wall of the slot (20) and is arranged to be spaced from the surface of the roller body of the attachment roller (6), and the spacing is set to be 1 mm, and the error is ±0.5 mm.

4. The battery coating device according to claim 1, characterized in that: The invention also comprises a driving assembly (10), wherein the driving assembly (10) comprises a driven gear (11), a driving gear (12), a transmission gear (13), a driven pulley (14), a driving pulley (15), a belt (16) and a motor (17); The driving gear (12) and the driven pulley (14) are respectively coaxially mounted on one end of the coating roller (7), the driven gear (11) is mounted on the same end of the attachment roller (6), the driving pulley (15) is coaxially mounted with the motor (17), the motor (17) is used to drive the driving pulley (15) to rotate, the belt (16) is sleeved on the driving pulley (15) and the driven pulley (14) to drive the pulleys to rotate synchronously, the transmission gear (13) is meshedly mounted between the driving gear (12) and the driven gear (11) to drive the gears to rotate synchronously, and then, under the drive of the motor (17), the attachment roller (6) and the coating roller (7) are driven to rotate synchronously.

5. The battery coating device according to claim 4, characterized in that: It also comprises a mounting frame (9), wherein the attachment roller (6) and the coating roller (7) are mounted at different heights on a side surface of the mounting frame (9) facing the slurry (2), and the drive assembly (10) is mounted on the other side surface of the mounting frame (9) facing away from the slurry (2).

6. The battery coating device according to claim 1, characterized in that: It also includes a liquid tank (1) and a liquid replenishing tank (5), wherein the liquid tank (1) is used to contain the slurry (2), the attachment roller (6) and the coating roller (7) are both located above the liquid tank (1), and the liquid replenishing tank (5) is connected to the liquid tank (1) and is used to replenish the slurry (2) into the liquid tank (1).

7. The battery coating device according to claim 6, characterized in that: It also includes a liquid level sensor (3) and a solenoid valve (4), wherein the liquid level sensor (3) is installed in the liquid tank (1) and is used to monitor the liquid level of the slurry (2) in the liquid tank (1) in real time, and the solenoid valve (4) is installed on the connecting pipeline between the liquid replenishing tank (5) and the liquid tank (1), and is electrically connected to the liquid level sensor (3) and is used to control the opening and closing of the connecting pipeline.

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