Coating device
Patent Information
- Application Number
- CN202522066067.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-25
AI Technical Summary
In existing coating devices, after coating the current collector surface with slurry, the negative electrode material is prone to falling off, leading to short circuits and performance degradation in the battery cell, and the slurry adhesion is insufficient.
Before coating, the surface of the sheet is polished by a polishing mechanism to increase the surface roughness and enhance the adhesion of the slurry. The polishing effect is further enhanced by rotating the polishing roller in reverse. At the same time, a slurry scraping mechanism and a drying mechanism are set up to ensure uniform coating and drying.
This improved the adhesion of the slurry to the surface of the cells, prevented the slurry from falling off, ensured the stability and performance of the cells, and resulted in a uniform drying effect.
Smart Images
Figure CN224926404U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of secondary battery manufacturing technology, specifically a coating device. Background Technology
[0002] Lithium batteries are batteries that use metallic lithium as the negative electrode. Lithium batteries have a long service life and can minimize battery replacements. They are widely used in watches, scientific instruments and communication equipment. The current collector is a metal foil in the lithium battery, which mainly collects the current generated by the battery's active materials to form a larger current output.
[0003] With the rapid development of the new energy passenger vehicle market, the requirements for the lithium-ion batteries used are becoming increasingly stringent, making the processing quality of current collectors particularly important.
[0004] In existing technologies, an electrode sheet is formed by coating a slurry onto the surface of a current collector using a coating device. Because the current collector surface is smooth, the negative electrode material is prone to detachment during subsequent rolling and die-cutting processes. Some of the detached slurry particles can become trapped inside the battery cell, causing short circuits. Furthermore, the low adhesion between the slurry and the foil surface allows the negative electrode material to detach from the foil during long-term battery cell cycling, leading to a decline in cell performance. Utility Model Content
[0005] In order to overcome the defects in the prior art, the present invention provides a coating device, which, before coating the sheet, grinds the surface of the sheet by the grinding mechanism to increase the surface roughness of the sheet, thereby improving the adhesion of the slurry to the surface of the sheet.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a coating device, comprising:
[0007] Feeding roller, wherein a material roll can be mounted;
[0008] A grinding mechanism is located downstream of the feeding roller along the direction of movement of the sheet.
[0009] A coating mechanism is located downstream of the polishing mechanism along the direction of sheet movement.
[0010] A drying mechanism is located downstream of the coating mechanism along the direction of sheet movement.
[0011] A receiving roller is located downstream of the drying mechanism along the direction of sheet movement.
[0012] The material roll is installed on the feeding roller, and its lead-out end passes sequentially through the grinding mechanism, coating mechanism, and drying mechanism before being connected to the take-up roller. The material roll is formed by winding a sheet.
[0013] By means of the above technical solution, before coating the sheet, the surface of the sheet is polished by the polishing mechanism to improve the surface roughness of the sheet, thereby improving the adhesion of the slurry to the surface of the sheet.
[0014] Furthermore, the polishing mechanism includes a polishing roller, and when the sheet passes through the polishing roller, the polishing roller abuts against the sheet.
[0015] Through the above technical solution, the sheet comes into contact with and abuts against the surface of the abrasive roller during the movement process, and the surface roughness of the sheet is improved under the action of the abrasive surface of the abrasive roller.
[0016] Furthermore, the polishing mechanism includes at least two abrasive rollers distributed on both sides of the sheet, wherein the lead-out end of the material roll passes around each of the abrasive rollers in sequence.
[0017] With the above technical solution, the lead-out end of the roll passes around each of the abrasive rollers in sequence, so that the sheet forms an S-shape between two adjacent abrasive rollers. During the movement of the sheet, the two sides of the sheet naturally abut against the abrasive rollers on both sides.
[0018] Furthermore, the abrasive roller is connected to a driving device, and under the action of the driving device, the abrasive roller rotates in the opposite direction to the movement direction of the sheet.
[0019] By using the above technical solution, the grinding effect can be enhanced by driving the grinding roller to rotate in the opposite direction to the movement of the sheet.
[0020] Furthermore, it also includes a slurry scraping mechanism, which is located downstream of the coating mechanism and upstream of the drying mechanism along the moving direction of the sheet.
[0021] The slurry scraping mechanism is used to scrape off excess slurry from the sheet.
[0022] Furthermore, the slurry scraping mechanism includes:
[0023] Guide rod;
[0024] A spring, which is sleeved on the guide rod;
[0025] A slider, which is sleeved on the guide rod, moves toward the sheet body under the action of the spring;
[0026] A scraper, which is hinged to the slider, is positioned toward the sheet body.
[0027] In the initial state, the edge of the scraper is spaced at a predetermined distance from the sheet. This technical solution allows the scraper to remove excess paste from the sheet. The spring buffers the force exerted by the scraper on the paste, preventing damage to the sheet.
[0028] Furthermore, the drying mechanism includes:
[0029] A drying oven having an inlet and an outlet for the sheet to pass through;
[0030] A heating device is installed inside the drying oven.
[0031] Through the above technical solution, the lead-out end of the material roll passes through the inlet and outlet of the drying box in sequence, so that the heating device can dry the sheet coated with slurry.
[0032] Furthermore, the drying mechanism also includes a fan, which is disposed on the side of the heating device away from the sheet.
[0033] The above technical solution utilizes a fan to force the circulation of hot air, eliminating temperature gradients within the drying oven and preventing localized overheating or uneven drying of the sheets.
[0034] Based on the above technical solution, the beneficial effects of this utility model are as follows:
[0035] 1. Before coating the sheet, the coating apparatus disclosed in this application grinds the surface of the sheet by a grinding mechanism to increase the surface roughness of the sheet, thereby improving the adhesion of the slurry to the surface of the sheet.
[0036] 2. This application uses a drive device to drive the grinding roller to rotate in the opposite direction to the moving direction of the sheet, thereby enhancing the grinding effect of the grinding roller on the surface of the sheet.
[0037] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0039] Figure 1 This is a schematic diagram of the coating device in an embodiment of the present invention;
[0040] Figure 2This is a schematic diagram of the coating device with multiple abrasive rollers in an embodiment of this utility model;
[0041] Figure 3 This is a schematic diagram of the coating device with a slurry scraping mechanism in an embodiment of this utility model;
[0042] Figure 4 This is a schematic diagram of the slurry scraping mechanism in an embodiment of this utility model.
[0043] The reference numerals in the above figures are as follows: 1. Feeding roller; 2. Material roll; 21. Sheet; 3. Abrasive roller; 31a. Lower abrasive roller; 31b. Upper abrasive roller; 4. First guide roller; 5. Coating mechanism; 6. Slurry scraping mechanism; 61. Guide rod; 62. Spring; 63. Slider; 64. Scraper; 7. Drying mechanism; 71. Drying box; 72. Heating device; 73. Fan; 8. Receiving roller; 9. Second guide roller. Detailed Implementation
[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0045] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0046] Example: This example discloses a coating apparatus, including:
[0047] Feeding roller 1, wherein the feeding roller 1 can be fitted with material roll 2;
[0048] A grinding mechanism is located downstream of the feeding roller 1 along the moving direction of the sheet 21.
[0049] The coating mechanism 5 is located downstream of the polishing mechanism along the moving direction of the sheet 21.
[0050] Drying mechanism 7 is located downstream of coating mechanism 5 along the moving direction of sheet 21.
[0051] The receiving roller 8 is located downstream of the drying mechanism 7 along the moving direction of the sheet 21.
[0052] The material roll 2 is installed after the feeding roller 1, and the lead-out end of the material roll 2 passes through the grinding mechanism, the coating mechanism 5, and the drying mechanism 7 in sequence before being connected to the receiving roller 8. The material roll 2 is formed by winding the sheet 21.
[0053] By means of the above technical solution, before coating the sheet 21, the surface of the sheet 21 is polished by the polishing mechanism to improve the surface roughness of the sheet 21, thereby improving the adhesion of the slurry to the surface of the sheet 21.
[0054] The polishing mechanism has a frosted surface, and the sheet abuts against the frosted surface when it passes through the polishing mechanism.
[0055] In some feasible embodiments, such as Figure 1 As shown, the polishing mechanism includes a polishing roller 3. When the sheet passes through the polishing roller 3, the polishing roller 3 abuts against the sheet 21.
[0056] Through the above technical solution, the sheet 21 contacts and abuts against the surface of the abrasive roller 3 during the movement process, and the surface roughness of the sheet 21 is improved under the action of the abrasive surface of the abrasive roller 3.
[0057] In some feasible embodiments, the polishing mechanism includes at least two abrasive rollers 3, which are distributed on both sides of the sheet 21, wherein the lead-out end of the material roll 2 passes around each of the abrasive rollers 3 in sequence.
[0058] In some feasible embodiments, such as Figure 2 As shown, the polishing mechanism includes two abrasive rollers, which are distributed on both sides of the sheet 21. In this application, the abrasive rollers are divided into a lower abrasive roller 3a and an upper abrasive roller 3b. The lead-out end of the material roll 2 passes under the lower abrasive roller 3a and above the upper abrasive roller 3b in sequence before entering the coating mechanism 5.
[0059] Through the above technical solution, the lead-out end of the material roll 2 passes around the lower grinding roller 3a and the upper grinding roller 3b in sequence, so that the sheet 21 forms an S-shape between two adjacent lower grinding rollers 3a and upper grinding rollers 3b. During the movement of the sheet 21, the two sides of the sheet 21 naturally abut against the lower grinding roller 3a and the upper grinding roller 3b.
[0060] It should be noted that multiple lower grinding rollers 3a and upper grinding rollers 3b can be set to further enhance the grinding effect.
[0061] In some feasible embodiments, the abrasive roller 3 is connected to a driving device, which includes a motor. Under the action of the driving device, the abrasive roller 3 rotates in the opposite direction to the movement of the sheet 21.
[0062] By using the above technical solution, the grinding effect can be enhanced by driving the grinding roller 3 to rotate in the opposite direction to the moving direction of the disc 21.
[0063] In some feasible embodiments, such as Figure 2 As shown, a first guide roller 4 is also provided between the grinding mechanism and the coating mechanism 5. After the lead-out end of the material roll 2 passes through each of the grinding rollers 3 in sequence, the first guide roller 4 ensures that it can enter the coating mechanism 5 in parallel. The coating mechanism 5 is used to coat the slurry onto the sheet 21.
[0064] In some feasible embodiments, coating mechanisms 5 are respectively provided on both sides of the sheet 21, so that both sides of the sheet 21 are coated simultaneously.
[0065] The coating apparatus also includes a slurry scraping mechanism 6, such as Figure 3 As shown, along the moving direction of the sheet 21, the slurry scraping mechanism 6 is located downstream of the coating mechanism 5 and upstream of the drying mechanism 7. The slurry scraping mechanism 6 is used to scrape off excess slurry from the sheet 21. The slurry scraping mechanism 6 includes:
[0066] Guide rod 61;
[0067] Spring 62, which is sleeved on the guide rod 61;
[0068] The slider 63 is sleeved on the guide rod 61, and moves toward the sheet 21 under the action of the spring 62;
[0069] A scraper 64 is hinged to the slider 63 and is positioned toward the sheet 21.
[0070] In the initial state, the edge of the scraper 64 is spaced at a predetermined distance from the sheet 21. Through this technical solution, the scraper 64 can scrape away excess slurry from the sheet 21. The spring 62 is used to buffer the force exerted by the scraper 64 on the slurry on the sheet 21, preventing damage to the sheet 21.
[0071] In some feasible embodiments, combined with Figure 3 , 4 As shown, the device includes two slurry scraping mechanisms 6, distributed on both sides of the sheet 21. Each slurry scraping mechanism 6 includes two parallel guide rods 61, each guide rod 61 being fitted with a spring 62. The slider 63 has two through holes, allowing it to be simultaneously fitted onto both guide rods 61. The scraper 64 is hinged to the slider 63.
[0072] The drying mechanism 7 includes:
[0073] Drying chamber 71, the drying chamber 71 having an inlet and an outlet through which the sheet 21 passes;
[0074] Heating device 72 is installed inside the drying oven.
[0075] Through the above technical solution, the lead-out end of the material roll 2 passes through the inlet and outlet of the drying box 71 in sequence, so that the heating device can dry the sheet 21 coated with slurry.
[0076] In some feasible embodiments, the drying mechanism 7 further includes a fan 73 disposed on the side of the heating device 72 away from the sheet 21.
[0077] By using the above technical solution, the fan 73 is used to force the circulation of hot air, eliminating the temperature gradient inside the drying oven 71 and avoiding local overheating or uneven drying of the sheet 21.
[0078] In some feasible embodiments, such as Figure 1 As shown, the drying oven 71 is equipped with two heating devices 72, which are distributed on both sides of the sheet 21. Each heating device 72 has two fans 73 on the side away from the sheet 21.
[0079] In some feasible embodiments, the heating device 72 includes a heating wire horizontally disposed within the drying chamber 71, which generates heat when energized.
[0080] The outlet of the drying box 71 is provided with a second guide roller 9, and the lead-out end of the material roll 2 is connected to the take-up roller 8 after passing through the second guide roller 9.
[0081] It should be noted that the drying mechanism 7 can also be replaced by any other common drying equipment.
[0082] The coating apparatus disclosed in this application can be used in the coating process of a current collector, wherein the material roll 2 is formed by winding the current collector.
[0083] In some feasible embodiments, a frame is also included, on which the above-mentioned feeding roller 1, grinding mechanism, abrasive roller 3, first guide roller 4, coating mechanism 5, slurry scraping mechanism 6, drying mechanism 7, receiving roller 8 and second guide roller 9 are respectively mounted.
[0084] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.
Claims
1. A coating apparatus, characterized in that, include: Feeding roller, wherein a material roll can be mounted; A grinding mechanism is located downstream of the feeding roller along the direction of movement of the sheet. A coating mechanism is located downstream of the polishing mechanism along the direction of sheet movement. A drying mechanism is located downstream of the coating mechanism along the direction of sheet movement. A receiving roller is located downstream of the drying mechanism along the direction of sheet movement. The material roll is installed on the feeding roller, and the lead-out end of the material roll passes through the grinding mechanism, coating mechanism and drying mechanism in sequence before being connected to the receiving roller.
2. The coating apparatus as described in claim 1, characterized in that, The polishing mechanism includes a polishing roller, and when the sheet passes through the polishing roller, the polishing roller abuts against the sheet.
3. The coating apparatus as described in claim 1, characterized in that, The polishing mechanism includes at least two abrasive rollers, which are distributed on both sides of the sheet body, wherein the lead-out end of the material roll passes around each of the abrasive rollers in sequence.
4. The coating apparatus as described in claim 2 or 3, characterized in that, The abrasive roller is connected to a driving device, and under the action of the driving device, the abrasive roller rotates in the opposite direction to the movement of the sheet.
5. The coating apparatus as described in claim 1, characterized in that, It also includes a slurry scraping mechanism, which is located downstream of the coating mechanism and upstream of the drying mechanism along the direction of sheet movement.
6. The coating apparatus as described in claim 5, characterized in that, The slurry scraping mechanism includes: Guide rod; A spring, which is sleeved on the guide rod; A slider, which is sleeved on the guide rod, moves toward the sheet body under the action of the spring; A scraper, which is hinged to the slider, is positioned toward the sheet body.
7. The coating apparatus as claimed in claim 1, characterized in that, The drying mechanism includes: A drying oven having an inlet and an outlet for the sheet to pass through; A heating device is installed inside the drying oven.
8. The coating apparatus as claimed in claim 7, characterized in that, The drying mechanism also includes a fan, which is located on the side of the heating device away from the sheet.