A coating system for improving adhesion

Abstract

This invention relates to the field of battery cell coating technology and discloses a coating system for improving adhesion. It includes: an equipment frame, a first base coating roller, a base adhesive coating mechanism, a double-layer coating mechanism, and a double-layer auxiliary coating roller. Both the first base coating roller and the double-layer auxiliary coating roller are rotatably connected to the equipment frame. The double-layer auxiliary coating roller is positioned obliquely above the first base coating roller. A double-layer coating mechanism is located on one side of the double-layer auxiliary coating roller. The double-layer auxiliary coating roller is rotatably connected to the equipment frame. A base adhesive coating mechanism is located between the first base coating roller and the double-layer auxiliary coating roller. The double-layer coating mechanism is simultaneously connected to a high-density main material storage mechanism and a high-porosity main material storage mechanism. This system has the advantages of improving electrode adhesion and enhancing battery rate performance.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and in particular to a coating system for improving adhesion. Background Technology

[0002] During the drying process of single-layer coating, the binder will migrate as the solvent evaporates, which will reduce the adhesion between the main material and the foil. To solve the problem of adhesion in single-layer coating, the proportion of binder is usually increased, but this will lead to a decrease in the proportion of negative electrode active material.

[0003] Therefore, a coating system for improving adhesion is provided to solve the above problems. Utility Model Content

[0004] The main purpose of this invention is to solve the problem that in the prior art, during the drying process of single-layer coating, the binder migrates with the evaporation of the solvent, which reduces the adhesion between the main material and the foil. To solve the problem of adhesion in single-layer coating, the proportion of binder is usually increased, but this leads to a decrease in the proportion of negative electrode active material.

[0005] The first aspect of this utility model provides a coating system for improving adhesion, the coating system for improving adhesion comprising: The equipment includes a frame, a first base coat roller, a base coat mechanism, a double-layer coating mechanism, and a double-layer auxiliary coat roller. The first base coat roller and the double-layer auxiliary coat roller are rotatably connected to the equipment frame. The double-layer auxiliary coat roller is positioned diagonally above the first base coat roller. A double-layer coating mechanism is provided on one side of the double-layer auxiliary coat roller. The double-layer auxiliary coat roller is rotatably connected to the equipment frame. A base coat mechanism is provided between the first base coat roller and the double-layer auxiliary coat roller. The double-layer coating mechanism is simultaneously connected to both the high-density main material storage mechanism and the high-porosity main material storage mechanism.

[0006] Optionally, the base adhesive coating mechanism includes a back roller, a spin coating roller, a feeding roller, and a base adhesive trough. The back roller and the spin coating roller are arranged in pairs. The feeding roller is arranged below the spin coating roller. The lower part of the feeding roller is located in the base adhesive trough. The back roller, the spin coating roller, and the feeding roller are all rotatably connected to the equipment frame. The base adhesive trough is fixedly arranged on the equipment frame.

[0007] Optionally, it also includes a back roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the back roller drive motor is fixedly connected to the back roller, and the back roller drive motor is used to drive the back roller to rotate.

[0008] Optionally, the device also includes a spin coating roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the spin coating roller drive motor is fixedly connected to the spin coating roller, and the spin coating roller drive motor is used to drive the spin coating roller to rotate.

[0009] Optionally, it also includes a feeding roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the feeding roller drive motor is fixedly connected to the feeding roller, and the feeding roller drive motor is used to drive the feeding roller to rotate.

[0010] Optionally, a scraper is also included, which is fixedly mounted on the equipment frame and disposed on one side of the spin coating roller.

[0011] Optionally, the double-layer coating mechanism includes a coating body, a first coating slit channel, a second coating slit channel, a first slit automatic adjustment control mechanism, and a second slit automatic adjustment control mechanism. The coating body has a first coating slit channel and a second coating slit channel inside. The first coating slit channel is located above the second coating slit channel. The first slit automatic adjustment control mechanism is fixedly installed on the upper end face of the coating body. The first slit automatic adjustment mechanism is used to control the width of the first slit channel. The second slit automatic adjustment control mechanism is fixedly installed on the lower end face of the coating body. The second slit automatic adjustment mechanism is used to control the width of the second slit channel. A connector is provided at the end of the coating body away from the coating head. The connector has a first connecting hole and a second connecting hole. The first connecting hole is used to connect the first coating slit channel with the high-porosity main material storage mechanism. The second connecting hole is used to connect the second coating slit channel with the high-porosity main material storage mechanism.

[0012] Optionally, the first slit automatic adjustment control device and the second slit automatic adjustment control device have the same structure. The first slit automatic adjustment control device includes a mounting bracket, a drive mechanism, and a slit width changing actuator. The mounting bracket is installed on the coating body by bolts. The drive mechanism is fixedly installed on the upper end of the mounting bracket. The slit width changing actuator is movably installed on the mounting bracket on one side of the drive bracket. The drive mechanism and the slit width changing actuator are connected by a first connector.

[0013] Optionally, the first connecting member includes a first gear, a second gear, and a first bearing. The first gear is fixedly mounted on the drive shaft of the drive motor. The outer side of the first bearing is fixedly connected to the mounting bracket. The upper end of the inner side of the first bearing is fixedly connected to the lower end of the second gear. The outer side of the second gear meshes with the first gear. The inner side of the second gear is provided with a thread for movable connection with the slit width changing actuator.

[0014] Optionally, the slit width changing actuator is a lead screw, the lower end of which is fixedly connected to a second bearing, and the second bearing is fixedly connected to the coating body.

[0015] This invention proposes a coating system for improving adhesion. It achieves a coating method that combines a base coat adhesive with a double-layer coating through a double-layer coating mechanism, thereby reducing the proportion of adhesive and increasing the proportion of active material, improving electrode adhesion, and enhancing battery rate performance. Attached Figure Description

[0016] Figure 1 A schematic diagram of a coating system for improving adhesion provided by this utility model; Figure 2 A schematic diagram of the double-layer coating mechanism provided by this utility model; Figure 3 This is a schematic diagram illustrating the implementation effect of the double-layer coating provided by this utility model.

[0017] The corresponding reference numerals in the attached drawings are as follows: 1-Double-layer coating mechanism, 101-Coating body, 102-First coating slit channel, 103-Second coating slit channel, 104-Mounting bracket, 105-Slit width changing actuator, 106-Second gear, 107-First connecting hole, 108-Second connecting hole, 2-Double-layer auxiliary coating roller, 3-First base coating roller, 4-Spin coating roller, 5-Back roller, 6-Feeding roller, 7-Bottom adhesive trough, 8-Scraper. Detailed Implementation

[0018] like Figure 1-3 As shown, this embodiment provides a coating system for improving adhesion, the coating system for improving adhesion includes: The equipment frame, the first base coating roller 3, the base coating mechanism, the double coating mechanism 1, and the double auxiliary coating roller 2 are all rotatably connected to the equipment frame. The double auxiliary coating roller 2 is located diagonally above the first base coating roller. The double coating mechanism 1 is located on one side of the double auxiliary coating roller. The double auxiliary coating roller is rotatably connected to the equipment frame. The base coating mechanism is located between the first base coating roller and the double auxiliary coating roller. The double-layer coating mechanism is connected to both the high-density main material storage mechanism and the high-porosity main material storage mechanism.

[0019] The base adhesive coating mechanism includes a back roller 5, a spin coating roller 4, a feeding roller 6, and a base adhesive trough 7. The back roller and the spin coating roller are arranged in pairs. The feeding roller is located below the spin coating roller. The lower part of the feeding roller is located in the base adhesive trough. The back roller, the spin coating roller, and the feeding roller are all rotatably connected to the equipment frame. The base adhesive trough is fixedly installed on the equipment frame.

[0020] It also includes a back roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the back roller drive motor is fixedly connected to the back roller, and the back roller drive motor is used to drive the back roller to rotate.

[0021] It also includes a spin coating roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the spin coating roller drive motor is fixedly connected to the spin coating roller, and the spin coating roller drive motor is used to drive the spin coating roller to rotate.

[0022] It also includes a feeding roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the feeding roller drive motor is fixedly connected to the feeding roller, and the feeding roller drive motor is used to drive the feeding roller to rotate.

[0023] It also includes a scraper, which is fixedly mounted on the equipment frame and positioned on one side of the spin coating roller.

[0024] The double-layer coating mechanism includes a coating body 101, a first coating slit channel 102, a second coating slit channel 103, a first slit automatic adjustment control mechanism, and a second slit automatic adjustment control mechanism. The coating body has a first coating slit channel and a second coating slit channel inside. The first coating slit channel is located above the second coating slit channel. The first slit automatic adjustment control mechanism is fixedly installed on the upper end face of the coating body. The first slit automatic adjustment mechanism is used to control the width of the first slit channel. The second slit automatic adjustment control mechanism is fixedly installed on the lower end face of the coating body. The second slit automatic adjustment mechanism is used to control the width of the second slit channel. A connector is provided at the end of the coating body away from the coating head. The connector has a first connecting hole 107 and a second connecting hole 108. The first connecting hole is used to connect the first coating slit channel with the high-porosity main material storage mechanism, and the second connecting hole is used to connect the second coating slit channel with the high-porosity main material storage mechanism.

[0025] In double-layer coating, the high-porosity main material has a higher number of large particles and larger gaps between particles, making it easier for the electrolyte to penetrate. The high-compacted main material is a material with a graded distribution of particle sizes, and this material is laid in the lower layer.

[0026] The first slit automatic adjustment control device and the second slit automatic adjustment control device have the same structure. The first slit automatic adjustment control device includes a mounting bracket 104, a drive mechanism and a slit width change actuator 105. The mounting bracket is installed on the coating body by bolts. The drive mechanism is fixedly installed on the upper end of the mounting bracket. The slit width change actuator is movably installed on the mounting bracket on one side of the drive bracket. The drive mechanism and the slit width change actuator are connected by a first connector.

[0027] The first connecting component includes a first gear, a second gear 106, and a first bearing. The first gear is fixedly mounted on the drive shaft of the drive motor. The outer side of the first bearing is fixedly connected to the mounting bracket. The upper end of the inner side of the first bearing and the lower end of the second gear are fixedly connected. The outer side of the second gear meshes with the first gear. The inner side of the second gear is provided with a thread for movable connection with the slit width changing actuator.

[0028] The slit width adjustment mechanism is a lead screw, with its lower end fixedly connected to a second bearing, which in turn is fixedly connected to the coating body. During operation, a drive motor rotates the first gear, which in turn rotates the second gear. The thread on the inner side of the second gear causes the lead screw to move downwards, thus adjusting the slit width. In practical use, the material to be coated is first transferred to the back roller and spin coating roller of the base coating mechanism via the first base coating roller. The feeding roller of the base coating mechanism transports the base adhesive in the base adhesive trough to the spin coating roller. The spin coating roller applies the base adhesive to the material to be coated. The scraper scrapes the excess base adhesive on the spin coating roller into the base adhesive trough. The material coated by the base coating mechanism is then transferred to the double-layer auxiliary coating roller. The double-layer coating mechanism applies a double layer coating to the material.

[0029] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coating system for improving adhesion, characterized in that, include: The equipment includes a frame, a first base coat roller, a base coat mechanism, a double-layer coating mechanism, and a double-layer auxiliary coat roller. The first base coat roller and the double-layer auxiliary coat roller are rotatably connected to the equipment frame. The double-layer auxiliary coat roller is positioned diagonally above the first base coat roller. A double-layer coating mechanism is provided on one side of the double-layer auxiliary coat roller. The double-layer auxiliary coat roller is rotatably connected to the equipment frame. A base coat mechanism is provided between the first base coat roller and the double-layer auxiliary coat roller. The double-layer coating mechanism is simultaneously connected to both the high-density main material storage mechanism and the high-porosity main material storage mechanism.

2. The coating system for improving adhesion according to claim 1, characterized in that, The base adhesive coating mechanism includes a back roller, a spin coating roller, a feeding roller, and a base adhesive trough. The back roller and the spin coating roller are arranged in pairs. The feeding roller is arranged below the spin coating roller. The lower part of the feeding roller is located in the base adhesive trough. The back roller, the spin coating roller, and the feeding roller are all rotatably connected to the equipment frame. The base adhesive trough is fixedly arranged on the equipment frame.

3. The coating system for improving adhesion according to claim 2, characterized in that, It also includes a back roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the back roller drive motor is fixedly connected to the back roller, and the back roller drive motor is used to drive the back roller to rotate.

4. The coating system for improving adhesion according to claim 3, wherein It also includes a spin coating roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the spin coating roller drive motor is fixedly connected to the spin coating roller, and the spin coating roller drive motor is used to drive the spin coating roller to rotate.

5. The coating system for improving adhesion according to claim 4, wherein It also includes a feeding roller drive motor, which is fixedly mounted on the equipment frame. The drive shaft of the feeding roller drive motor is fixedly connected to the feeding roller, and the feeding roller drive motor is used to drive the feeding roller to rotate.

6. The coating system for improving adhesion according to claim 5, wherein It also includes a scraper, which is fixedly mounted on the equipment frame and disposed on one side of the spin coating roller.

7. The coating system for improving adhesion according to claim 6, wherein The double-layer coating mechanism includes a coating body, a first coating slit channel, a second coating slit channel, a first slit automatic adjustment control mechanism, and a second slit automatic adjustment control mechanism. The coating body has a first coating slit channel and a second coating slit channel inside. The first coating slit channel is located above the second coating slit channel. The first slit automatic adjustment control mechanism is fixedly installed on the upper end face of the coating body, and is used to control the width of the first slit channel. The second slit automatic adjustment control mechanism is fixedly installed on the lower end face of the coating body, and is used to control the width of the second slit channel. A connector is provided at the end of the coating body away from the coating head. The connector has a first connecting hole and a second connecting hole. The first connecting hole connects the first coating slit channel to the high-porosity main material storage mechanism, and the second connecting hole connects the second coating slit channel to the high-porosity main material storage mechanism.

8. The coating system for improving adhesion according to claim 7, wherein The first slit automatic adjustment control device and the second slit automatic adjustment control device have the same structure. The first slit automatic adjustment control device includes a mounting bracket, a drive mechanism, and a slit width change actuator. The mounting bracket is installed on the coating body by bolts. The drive mechanism is fixedly installed on the upper end of the mounting bracket. The slit width change actuator is movably installed on the mounting bracket on one side of the drive mechanism. The drive mechanism and the slit width change actuator are connected by a first connector.

9. The coating system for improving adhesion according to claim 8, characterized in that, The first connecting member includes a first gear, a second gear, and a first bearing. The first gear is fixedly mounted on the drive shaft of the drive motor. The outer side of the first bearing is fixedly connected to the mounting bracket. The upper end of the inner side of the first bearing is fixedly connected to the lower end of the second gear. The outer side of the second gear meshes with the first gear. The inner side of the second gear is provided with a thread for movable connection with the slit width changing actuator.

10. The coating system for improving adhesion according to claim 9, wherein The slit width change actuator is a lead screw, the lower end of which is fixedly connected to a second bearing, and the second bearing is fixedly connected to the coating body.

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