High-speed mask coating device

Abstract

The invention discloses a high-speed mask coating device, which comprises: a foil tape conveying mechanism, which comprises an unwinding assembly, a foil deviation correction actuator, a winding assembly and a plurality of first passing rollers; the rubber template belt conveying mechanism comprises a traction roller, a tension adjusting assembly, a scraping and sucking assembly, a cleaning assembly and a plurality of second passing rollers, a rubber template material belt is wound on the second passing rollers to form a closed rubber template material belt, and the traction roller is used for pulling the rubber template material belt to circularly convey; the scraping and sucking assembly is used for scraping and sucking slurry on the surface of a rubber template material belt, and the cleaning assembly is used for cleaning residual slurry on the surface of the rubber template material belt; and the coating mechanism comprises a coating die head and a back roller, the rubber template material belt and the foil material coincide on the back roller, the coating die head is used for coating the electrode slurry on the rubber template material belt and the foil material, and after the rubber template material belt is separated from the foil material, a required coating shape is formed on the surface of the foil material. According to the invention, zero thinning of the edge of the foil coating can be realized, and the coating quality and stability of the foil are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coating equipment, and particularly relates to a high-speed mask coating device. Background Art

[0002] As the market increasingly pursues high capacity density, high energy density, high safety, etc. of the electrode sheet, if the effect of zero thinning at the four peripheral edges of the coating can be achieved during the production of the electrode sheet, it will greatly increase the content of the active material, improve the alignment accuracy of the positive and negative electrodes during the production of the battery cell, reduce the internal resistance of the electronic conductance at the edge of the electrode sheet, and significantly improve the performance of the battery electrode sheet.

[0003] In the existing production process, generally, a gasket chamfer is used to gradually thin the left and right edges of the electrode sheet, or an intermittent valve is used to thin the thickness of the front and rear ends.

[0004] However, neither of the above two methods can achieve zero thinning at the edge of the electrode sheet coating. Moreover, they also lead to instability in the thickness of the electrode sheet coating and increase the difficulty of equipment debugging. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a high-speed mask coating device, which can achieve zero thinning at the edge of the foil coating and improve the coating quality and stability of the foil.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A high-speed mask coating device, comprising: a foil running mechanism, including an unwinding assembly, a winding assembly, and a plurality of first guide rollers, the unwinding assembly is used to release the foil material roll, the winding assembly is used to wind the foil, and the plurality of first guide rollers are used to support and guide the foil;

[0008] A glue template running mechanism, including a traction roller, a glue template tape, a cleaning assembly, and a plurality of second guide rollers, the glue template tape is a closed glue template tape wound around the plurality of second guide rollers, the traction roller is used to traction the glue template tape to circulate, and the cleaning assembly is used to clean the residual slurry on the surface of the glue template tape;

[0009] A coating mechanism, including a coating die head and a back roller, the glue template tape and the foil overlap on the back roller, the foil abuts against the roller surface of the back roller, the glue template tape is stacked on the side of the foil away from the back roller, the coating die head is located on the side of the glue template tape away from the back roller, and the coating die head is used to coat the electrode slurry on the glue template tape and the foil.

[0010] As a further improvement of the above technical solution, the tape feeding mechanism of the rubber template further includes a scraping and suction assembly, which is located between the coating mechanism and the cleaning assembly. The scraping and suction assembly is used to scrape and suck away the slurry on the surface of the rubber template strip. The scraping and suction assembly includes a mounting plate, a first cylinder, and a scraping and suction head. The first cylinder is mounted on the mounting plate and is used to drive the scraping and suction head to approach or move away from the rubber template strip. The scraping and suction head includes a housing and a scraper provided on the housing. A negative pressure chamber is provided inside the housing. A material suction port is provided on one side of the scraper, and the material suction port is communicated with the negative pressure chamber. The telescopic end of the first cylinder is connected to the housing.

[0011] As a further improvement of the above technical solution, liquid inlet pipes and liquid outlet pipes are respectively connected to both sides of the housing. Both the liquid inlet pipes and the liquid outlet pipes are communicated with the negative pressure chamber. The liquid inlet pipes are used to introduce a solution for diluting the slurry, and the liquid outlet pipes are used to discharge the diluted waste solution.

[0012] As a further improvement of the above technical solution, the cleaning assembly includes a cleaning tank and a spray head. The spray head is located directly above the cleaning tank. The traction roller is located inside the cleaning tank. The cleaning tank is used to load the dissolving liquid, and the spray head is used to spray the cleaning liquid onto the rubber template strip.

[0013] As a further improvement of the above technical solution, the tape feeding mechanism of the rubber template further includes a hot air drying assembly, which is used to dry the cleaned rubber template strip.

[0014] As a further improvement of the above technical solution, a plurality of spray heads are provided, and the plurality of spray heads are arranged at intervals along the tape running direction of the rubber template strip;

[0015] A plurality of hot air drying assemblies are provided, and the plurality of hot air drying assemblies are arranged at intervals along the tape running direction of the rubber template strip.

[0016] As a further improvement of the above technical solution, a rubber pressing roller is provided on one side of the back roller. The rubber pressing roller and the coating die head are arranged in sequence along the tape running direction of the foil on the outer periphery of the back roller. The rubber pressing roller presses the rubber template strip and the foil against the back roller.

[0017] As a further improvement of the above technical solution, the tape feeding mechanism of the rubber template further includes a tension adjusting assembly. The tension adjusting assembly includes a swing frame, a tension roller rotatably connected to the swing frame, and a second cylinder for driving the swing frame to swing. The rubber template strip is wound around the tension roller.

[0018] As a further improvement of the above technical solution, the foil tape feeding mechanism further includes a foil deviation rectifying actuator for correcting the position deviation of the foil; the template tape feeding mechanism further includes a template deviation rectifying actuator for correcting the position deviation of the template tape.

[0019] As a further improvement of the above technical solution, the foil tape feeding mechanism further includes a CCD vision detection system for detecting the coating size and appearance of the foil after coating.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention provides a high-speed mask coating device. By setting a foil tape feeding mechanism, a template tape feeding mechanism and a coating die head, the template tape and the foil overlap on the back roller. Then, the coating die head coats the electrode paste on the overlapping sheet of the template tape and the foil. After coating, the template tape and the foil are separated. The position of the separated foil corresponding to the hollowed-out position of the template tape is covered by the coating, forming the required coating shape. And the four sides of the foil are covered by the template tape, avoiding the thinning area. Thus, zero thinning of the foil coating edge is achieved, improving the coating quality and stability of the foil.

[0022] 2. The present invention provides a high-speed mask coating device. By setting the template tape as a closed template tape wound around a plurality of second guide rollers, the traction roller drives the template tape to be conveyed. After separation, the template tape first passes through the scraping and suction assembly. The scraping and suction assembly scrapes and sucks away the paste on the surface of the template tape, removing most of the paste on the template tape. Then, the residual paste on the surface of the template tape is cleaned by the cleaning assembly. Finally, it is conveyed and guided by the traction roller and the second guide rollers, enabling the template tape to be recycled. Thus, space can be saved and production costs can be reduced. Description of the Drawings

[0023] The present invention will be further described below in conjunction with the drawings and embodiments.

[0024] Figure 1 is a schematic structural diagram provided by an embodiment of the present invention;

[0025] Figure 2 is Figure 1 the schematic structural diagram of the scraping and suction assembly in

[0026] Figure 3 is Figure 2 the cross-sectional view of

[0027] Figure 4 is Figure 1 the schematic structural diagram of the tension adjusting assembly in

[0028] Reference numerals: 100 - foil, 110 - foil deviation rectifier, 120 - first over - roller, 131 - back - roller, 132 - rubber - pressing roller, 140 - coating die head, 150 - CCD vision detection system;

[0029] 200 - rubber - template material tape, 210 - traction roller, 220 - tension - adjusting assembly, 221 - swing frame, 222 - tension roller, 223 - second cylinder, 230 - scraping and suction assembly, 231 - mounting plate, 232 - first cylinder, 233 - scraping and suction head, 240 - cleaning assembly, 241 - cleaning tank, 242 - spray head, 250 - second over - roller, 260 - hot - air drying assembly, 270 - rubber - template deviation rectifier, 2331 - housing, 2332 - scraper, 2333 - negative - pressure chamber, 2334 - material - suction port, 2335 - liquid - inlet pipe, 2336 - liquid - outlet pipe. Detailed implementation manners

[0030] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present invention in combination with embodiments and drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts all fall within the scope of protection of the present invention. In addition, all connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the more optimal connection structure that can be formed by adding or reducing connection accessories according to specific implementation situations. Each technical feature in the present invention can be combined interactively without conflicting with each other.

[0031] Referring to Figure 1 , a high - speed mask coating device provided by an example of the present invention includes a foil running - belt mechanism, a rubber - template running - belt mechanism and a coating mechanism.

[0032] Structurally, the foil running - belt mechanism includes an unwinding assembly (not shown in the drawings), a foil deviation rectifier 110, a winding assembly (not shown in the drawings) and a plurality of first over - rollers 120. The unwinding assembly is used to release the foil 100 material roll, the foil deviation rectifier 110 is used to correct the position deviation of the foil 100, the winding assembly is used to wind the foil 100, and the plurality of first over - rollers 120 are used to support and guide the foil 100.

[0033] Further, the rubber template tape feeding mechanism includes a traction roller 210, a rubber template deviation rectifying actuator 270, a tension adjusting assembly 220, a scraping and suction assembly 230, a cleaning assembly 240, and a plurality of second guide rollers 250. The rubber template tape 200 is a closed rubber template tape wound around the plurality of second guide rollers 250. The traction roller 210 is used to traction the rubber template tape 200 to circulate and feed. The rubber template deviation rectifying actuator 270 is used to correct the position deviation of the rubber template tape 200. The tension adjusting assembly 220 is used to adjust the tension of the rubber template tape 200. The scraping and suction assembly 230 is used to scrape and suck the slurry on the surface of the rubber template tape 200. The cleaning assembly 240 is used to clean the residual slurry on the surface of the rubber template tape 200.

[0034] Further, the coating mechanism includes a coating die head 140 and a back roller 131. The rubber template tape 200 and the foil 100 overlap on the back roller 131. In terms of position, the foil 100 abuts against the roller surface of the back roller 131, and the rubber template tape 200 is stacked on the side of the foil 100 away from the back roller 131. The coating die head 140 is located on the side of the rubber template tape 200 away from the back roller 131. The coating die head 140 is used to coat the electrode slurry on the overlapping sheets of the rubber template tape 200 and the foil 100.

[0035] It should be noted that the coating die head 140 can be an extrusion die head, a spraying die head, or a die head in different forms such as transfer coating of a plate roller.

[0036] During operation, the position of the foil 100 is corrected by the foil deviation rectifying actuator 110, and after the foil 100 is aligned, it is conveyed. At the same time, the traction roller 210 drives the rubber template tape 200 to be conveyed, and through the combined action of the rubber template deviation rectifying actuator 270 and the tension adjusting assembly 220, the stable rubber template tape 200 is aligned with the foil 100 for conveyance. Then, the rubber template tape 200 and the foil 100 overlap on the back roller 131, so that the foil 100 abuts against the roller surface of the back roller 131, and the rubber template tape 200 is stacked on the side of the foil 100 away from the back roller 131. Then, the coating die head 140 coats the electrode slurry on the overlapping sheets of the rubber template tape 200 and the foil 100. After coating, the rubber template tape 200 and the foil 100 are separated. The position of the separated foil 100 corresponding to the hollowed-out position of the rubber template tape 200 is covered by the coating, forming the required coating shape. Moreover, the four sides of the foil 100 are avoided from being thinned due to the covering of the rubber template tape 200. Thus, zero thinning of the coating edge of the foil 100 is achieved, and the coating quality and stability of the foil 100 are improved.

[0037] After separation, the glue template strip 200 first passes through the scraping and suction assembly 230. The scraping and suction assembly 230 scrapes and sucks away the slurry on the surface of the glue template strip 200, and most of the slurry on the glue template strip 200 can be removed. Then, the residual slurry on the surface of the glue template strip 200 is cleaned by the cleaning assembly 240. Finally, it is conveyed and guided by the traction roller 210 and the second idler roller 250, so that the glue template strip 200 can be recycled. Thus, space can be saved and production costs can be reduced.

[0038] It should be noted that the hollow positions of the glue template strip 200 can be set in different shapes according to the process requirements of the battery cell, so as to achieve types such as zebra coating, symmetric L-shaped coating, and strip coating. Among them, the corresponding glue template strip 200 can be a single strip or multiple strips. The surface of the glue template strip 200 in contact with the foil 100 can be coated with glue or not.

[0039] Refer to Figure 2 and Figure 3 In some preferred embodiments, the scraping and suction assembly 230 includes a mounting plate 231, a first cylinder 232, and a scraping and suction head 233. The first cylinder 232 is mounted on the mounting plate 231, and the first cylinder 232 is used to drive the scraping and suction head 233 to approach or move away from the glue template strip 200.

[0040] During operation, the first cylinder 232 drives the scraping and suction head 233 to approach the glue template strip 200, so that the scraping and suction head 233 abuts against the surface of the glue template strip 200 coated with slurry. During the conveyance of the glue template strip 200, the scraping and suction head 233 scrapes and shovels up the slurry on the surface of the glue template strip 200 and sucks it away.

[0041] When not in operation, the first cylinder 232 drives the scraping and suction head 233 to move away from the glue template strip 200, so that the scraping and suction head 233 does not contact the glue template strip 200, avoiding abrasion of the glue template strip 200.

[0042] Furthermore, the scraping and suction head 233 includes a housing 2331, a scraper 2332 provided on the housing 2331. A negative pressure chamber 2333 is provided inside the housing 2331. A material suction port 2334 is provided on one side of the scraper 2332. The material suction port 2334 is communicated with the negative pressure chamber 2333. The telescopic end of the first cylinder 232 is connected to the housing 2331.

[0043] It can be understood that when the first cylinder 232 extends, it drives the scraping and suction head 233 as a whole to approach the rubber template material tape 200, causing the scraper 2332 to abut against the rubber template material tape 200. During the transportation of the rubber template material tape 200, the scraper 2332 shovels up the slurry on the surface of the rubber template material tape 200. Then, the shoveled-up slurry is sucked into the negative pressure chamber 2333 through the material suction port 2334. Thus, the shoveled-up slurry can be quickly sucked away, preventing the slurry from accumulating on the scraper 2332.

[0044] Furthermore, a liquid inlet pipe 2335 and a liquid outlet pipe 2336 are respectively connected to both sides of the housing 2331. Both the liquid inlet pipe 2335 and the liquid outlet pipe 2336 are communicated with the negative pressure chamber 2333. The liquid inlet pipe 2335 is used to introduce a solution for diluting the slurry, and the liquid outlet pipe 2336 is used to discharge the diluted waste solution. After the scraped slurry is sucked into the negative pressure chamber 2333, the solution enters the negative pressure chamber 2333 from the liquid inlet pipe 2335, diluting the slurry in the negative pressure chamber 2333. And the diluted waste solution is discharged through the liquid outlet pipe 2336. Thus, it can prevent the slurry in the negative pressure chamber 2333 from drying and caking too quickly and blocking in the negative pressure chamber 2333, ensuring that the negative pressure chamber 2333 remains unobstructed.

[0045] In some preferred embodiments, the cleaning assembly 240 includes a cleaning tank 241 and a spray head 242. The spray head 242 is located directly above the cleaning tank 241. The cleaning tank 241 is loaded with a dissolving liquid, which is used to dissolve the residual slurry on the surface of the rubber template material tape 200. The spray head 242 is used to spray the cleaning liquid onto the rubber template material tape 200. On the one hand, it can completely clean the residual slurry coated on the surface of the rubber template material tape 200, enabling the rubber template material tape 200 to be reused and saving production costs. On the other hand, the cleaning liquid sprayed on the surface of the rubber template material tape 200 and the residual dissolving liquid can drip into the cleaning tank 241. Thus, it can ensure the cleanliness of the equipment and prevent the equipment from being contaminated.

[0046] In some preferred embodiments, the rubber template tape running mechanism further includes a hot air drying assembly 260, which is used to dry the cleaned rubber template material tape 200. Thus, the moisture or solution on the surface of the rubber template material tape 200 can be quickly removed, shortening the drying time, shortening the running length of the rubber template material tape 200 during drying, and improving production efficiency.

[0047] Specifically, the hot air drying assembly 260 can adopt an air knife, which blows high-speed hot air flow onto the rubber template material tape 200, causing the moisture or solution on the rubber template material tape 200 to fly out or evaporate by heating. Thus, the drying efficiency is improved.

[0048] In some preferred embodiments, a plurality of spray heads 242 are provided, and the plurality of spray heads 242 are arranged at intervals along the running direction of the adhesive template strip 200. Thus, the residual slurry coated on the surface of the adhesive template strip 200 can be fully cleaned, and the cleanliness of the surface of the adhesive template strip 200 can be improved.

[0049] Further, a plurality of hot air drying assemblies 260 are provided, and the plurality of hot air drying assemblies 260 are arranged at intervals along the running direction of the adhesive template strip 200. Thus, the drying efficiency of the adhesive template strip 200 can be further improved.

[0050] In some preferred embodiments, a rubber pressure roller 132 is provided on one side of the back roller 131. The rubber pressure roller 132 and the coating die head 140 are arranged in sequence along the running direction of the foil 100 on the outer periphery of the back roller 131. The rubber pressure roller 132 presses the adhesive template strip 200 and the foil 100 against the back roller 131. On the one hand, the tension between the adhesive template strip 200 and the foil 100 can be blocked. On the other hand, it can also ensure that the adhesive template strip 200 and the foil 100 are completely adhered, prevent air bubbles from being generated between the adhesive template strip 200 and the foil 100, and ensure the mask coating quality.

[0051] After the adhesive template strip 200 and the foil 100 are pressed together to form a composite sheet, the back roller 131 can support the composite sheet, facilitating the coating die head 140 to coat the composite sheet.

[0052] Refer to Figure 4 , in some preferred embodiments, the tension adjusting assembly 220 includes a swing frame 221, a tension roller 222 rotatably connected to the swing frame 221, and a second air cylinder 223 for driving the swing frame 221 to swing. The adhesive template strip 200 is wound around the tension roller 222.

[0053] It can be understood that when the tension of the adhesive template strip 200 changes, the second air cylinder 223 drives the swing frame 221 to swing. The swing frame 221 drives the tension roller 222 to move along an arc trajectory around the rotation center of the swing frame 221. Thus, the pressure and angle of contact between the adhesive template strip 200 and the tension roller 222 can be adjusted. Furthermore, the tension of the adhesive template strip 200 can be maintained stable.

[0054] Further, two tension adjusting assemblies 220 are provided. In terms of position, the two tension adjusting assemblies 220 are respectively located in front of the adhesive template deviation rectifying actuator 270 and behind the hot air drying assembly 260. The traction roller 210 is located between the two tension adjusting assemblies 220.

[0055] Specifically, a driven roller is further provided on one side of the traction roller 210. When the rubber template strip 200 is running, the traction roller 210 presses the rubber template strip 200 against the driven roller, thereby increasing the friction between the rubber template strip 200 and the traction roller 210, and driving the rubber template strip 200 to run in a cycle by the rotation of the traction roller 210.

[0056] In some preferred embodiments, the foil running mechanism further includes a CCD vision detection system 150. The CCD vision detection system 150 is used to detect the coating size and appearance of the coated foil 100. On the one hand, through high-precision image acquisition and processing technology, the CCD vision detection system 150 can improve the measurement accuracy, quickly identify various defects on the coated surface of the foil 100, classify and record the defects, which is convenient for the control of the coating quality of the foil 100 and the improvement of the production process. On the other hand, through non-contact detection with the foil 100, it can avoid damaging the foil 100, and moreover, it can adapt to different working environments.

[0057] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A high-speed mask coating device, characterized in that, Comprising: A foil feeding mechanism, including an unwinding assembly, a winding assembly, and several first guide rollers. The unwinding assembly is used to release the foil material roll, the winding assembly is used to wind the foil, and the several first guide rollers are used to support and guide the foil; A rubber template feeding mechanism, including a traction roller, a rubber template tape, a cleaning assembly, and several second guide rollers. The rubber template tape is a closed rubber template tape wound around the several second guide rollers. The traction roller is used to traction the rubber template tape to circulate, and the cleaning assembly is used to clean the residual slurry on the surface of the rubber template tape; A coating mechanism, including a coating die head and a backing roller. The rubber template tape and the foil coincide on the backing roller. The foil abuts against the roller surface of the backing roller, and the rubber template tape is stacked on the side of the foil away from the backing roller. The coating die head is located on the side of the rubber template tape away from the backing roller, and the coating die head is used to coat the electrode slurry on the rubber template tape and the foil.

2. The high-speed mask coating device according to claim 1, wherein, The rubber template feeding mechanism further includes a scraping and suction assembly, which is located between the coating mechanism and the cleaning assembly. The scraping and suction assembly is used to scrape and suck away the slurry on the surface of the rubber template tape. The scraping and suction assembly includes a mounting plate, a first cylinder, and a scraping and suction head. The first cylinder is mounted on the mounting plate, and the first cylinder is used to drive the scraping and suction head to approach or move away from the rubber template tape. The scraping and suction head includes a housing, a scraper provided on the housing, a negative pressure chamber is provided in the housing, a material suction port is provided on one side of the scraper, and the material suction port is communicated with the negative pressure chamber. The telescopic end of the first cylinder is connected to the housing.

3. The high-speed mask coating device according to claim 2, wherein, Liquid inlet pipes and liquid outlet pipes are respectively connected to both sides of the housing. The liquid inlet pipes and the liquid outlet pipes are both communicated with the negative pressure chamber. The liquid inlet pipes are used to introduce a solution for diluting the slurry, and the liquid outlet pipes are used to discharge the diluted waste solution.

4. A high-speed mask coating device according to claim 1, characterized in that, The cleaning assembly includes a cleaning tank and a spray head. The spray head is located directly above the cleaning tank. The cleaning tank is used to load the dissolving liquid, and the spray head is used to spray the cleaning liquid onto the rubber template tape.

5. A high-speed mask coating device according to claim 4, wherein, The rubber template feeding mechanism further includes a hot air drying assembly, which is used to dry the cleaned rubber template tape.

6. The high-speed mask coating device according to claim 5, wherein, There are multiple spray heads, and the multiple spray heads are arranged at intervals along the running direction of the rubber template tape; There are multiple hot air drying assemblies, and the multiple hot air drying assemblies are arranged at intervals along the running direction of the rubber template tape.

7. A high-speed mask coating device according to claim 1, wherein, A rubber pressing roller is arranged on one side of the backing roller. The rubber pressing roller and the coating die head are arranged on the outer periphery of the backing roller in sequence along the running direction of the foil. The rubber pressing roller presses the rubber template tape and the foil tightly on the backing roller.

8. A high-speed mask coating device according to claim 1, characterized in that, The rubber template feeding mechanism further includes a tension adjusting assembly, which includes a swing frame, a tension roller rotatably connected to the swing frame, and a second cylinder used to drive the swing frame to swing. The rubber template tape is wound around the tension roller.

9. The high-speed mask coating device according to claim 1, wherein The foil feeding mechanism further includes a foil deviation rectifying actuator, which is used to correct the position deviation of the foil; The rubber template feeding mechanism further includes a rubber template deviation rectifying actuator, which is used to correct the position deviation of the rubber template tape.

10. The high-speed mask coating device according to claim 1, characterized in that, The foil feeding mechanism further includes a CCD vision detection system, which is used to detect the coating size and appearance of the coated foil.

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