Gap coating equipment for secondary overprinting of lithium battery

Abstract

The utility model discloses clearance coating equipment for secondary overprinting of a lithium battery, which comprises an unwinding device, a coating device and a coating device, the coating device comprises a front surface coating device and a back surface coating device; the traction device comprises a first traction device and a second traction device, the first traction device is arranged at the front end of the front surface coating device, and the second traction device is arranged at the front end of the back surface coating device; the drying oven is arranged above the unwinding device, and the front surface coating device and the back surface coating device are respectively arranged at two ends of the drying oven; the winding device is used for winding the coated foil; and foils are conveyed among the unwinding device, the first traction mechanism, the front surface coating device, the drying oven, the second traction mechanism, the back surface coating device, the drying oven and the winding device in sequence. According to the clearance coating equipment, clearance coating and secondary overprinting are integrated, so that the clearance coating production efficiency is improved, and the production energy consumption can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, specifically to a gap coating device for secondary overprinting of lithium batteries. Background Technology

[0002] Currently, gap coating is achieved by modifying the parameters of the printing rollers. Since the diameter of the printing rollers is limited to 220mm-360mm due to equipment limitations, the blank area in the middle of the gap coating is less than 360mm. Furthermore, each printing roller can only correspond to one process size. If customers need to produce products of other process sizes, more printing rollers need to be manufactured, resulting in high costs. In addition, when customers need to perform secondary overprinting, they need to use coating equipment to perform two coatings. This process is not only costly, inefficient, and time-consuming, but it is also prone to foil scrapping during the two coating and unwinding processes, wasting costs.

[0003] Therefore, there is a need to provide a gap coating device for secondary overprinting of lithium batteries to solve the above problems. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a gap coating equipment for secondary overprinting of lithium batteries, which integrates gap coating and secondary overprinting, thereby improving the production efficiency of gap coating and reducing production energy consumption.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A gap coating device for secondary overprinting of lithium batteries, comprising:

[0007] An unwinding device, used to release the foil, is located in the middle of the intermittent coating equipment;

[0008] A coating apparatus includes a front coating apparatus and a back coating apparatus. Both the front and back coating apparatuses include a frame and a roller-passing mechanism and a coating mechanism mounted on the frame. The coating mechanism is located on both sides of the roller-passing mechanism. Each coating mechanism includes a gravure roller assembly, a forward / backward moving assembly, a doctor blade adjusting assembly, and a material box lifting assembly. The gravure roller assembly and the doctor blade adjusting assembly are both mounted on the forward / backward moving assembly, which drives them to move forward and backward. The gravure roller assembly includes a gravure roller and a coating roller. The coating roller is located on both sides of the roller-passing mechanism and is tangent to the gravure roller. The doctor blade adjusting assembly abuts against the gravure roller. The material box lifting assembly is located at the lower end of the gravure roller and provides slurry to the gravure roller. The doctor blade adjusting assembly evenly distributes the slurry on the gravure roller.

[0009] The traction device includes a first traction device and a second traction device, wherein the first traction device is disposed at the front end of the front coating device and the second traction device is disposed at the front end of the reverse coating device.

[0010] An oven is positioned above the unwinding device, and the front coating device and the back coating device are respectively positioned at both ends of the oven.

[0011] A winding device, used to wind up coated foil, is located at the tail end of the intermittent coating equipment;

[0012] Foil material is conveyed sequentially between the unwinding device, the first traction mechanism, the front coating device, the oven, the second traction device, the back coating device, the oven, and the rewinding device.

[0013] As a further improvement to the above technical solution, the forward and backward moving assembly includes a mounting base plate, a linear motor, forward and backward moving guide rails, a cable chain, and a movable mounting plate. The linear motor and the forward and backward moving guide rails are connected between the mounting base plate and the movable mounting plate, and the forward and backward moving guide rails are disposed on both sides of the linear motor. The cable chain is disposed on the outer end of the movable mounting plate, and one end of the cable chain is connected to the mounting base plate, and the other end of the cable chain is connected to the movable mounting plate.

[0014] As a further improvement to the above technical solution, the gravure roller assembly further includes a drive motor, a bearing support, a first mounting plate, a first transverse guide rail, and a screw drive assembly. The first mounting plate is slidably connected to the movable mounting plate via the first transverse guide rail. Both ends of the gravure roller are fixedly connected to the first mounting plate via the bearing support. The drive motor is mounted on the upper end of the first mounting plate, and one end of the gravure roller is connected to the drive motor. The screw drive assembly is mounted on the movable mounting plate and is used to drive the gravure roller to move along the first transverse guide rail.

[0015] As a further improvement to the above technical solution, the lead screw drive assembly includes a lead screw, a sliding pair, a bearing mounting base, and a handwheel. The two ends of the lead screw are mounted on the movable mounting plate through the bearing mounting base. The sliding pair is sleeved on the lead screw and is fixedly connected to the first mounting plate. The handwheel is connected to one end of the lead screw.

[0016] As a further improvement to the above technical solution, the scraper adjustment assembly includes a scraper, a scraper moving seat, a scraper flipping assembly, a linear sliding platform, a second mounting plate, a connecting seat, a second transverse guide rail, a moving connecting block, and a scraper translation drive assembly. The scraper abuts against the gravure roller. Both ends of the scraper are connected to the scraper moving seat. The scraper moving seat is connected to the linear sliding platform. The linear sliding platform is fixed on the connecting seat. The scraper flipping assembly is connected to the inner end of the scraper moving seat and to the middle of the scraper. The second mounting plate is slidably connected to the moving mounting plate via the second transverse guide rail. The connecting seat is fixed on the second mounting plate. The scraper translation drive assembly is mounted on the moving mounting plate, and the drive end of the scraper translation drive assembly is connected to the second mounting plate via the moving connecting block.

[0017] As a further improvement to the above technical solution, the scraper flipping assembly includes a cylinder, a cylinder fixing pin, a cylinder base, a rotating connector, and a scraper fixing double ear seat. The scraper fixing double ear seat is fixedly connected to the scraper. One end of the rotating connector is hinged to the scraper fixing double ear seat, and the other end of the rotating connector is connected to the protruding end of the cylinder. The cylinder fixing pin is fixedly connected to the inner side of the scraper moving seat. The cylinder base is hinged to one end of the cylinder fixing pin, and the cylinder is fixedly mounted on the cylinder base.

[0018] As a further improvement to the above technical solution, the scraper translation drive assembly includes a stepper motor, an eccentric rotating shaft, a bearing, and a motor mounting base. The stepper motor is fixed to the movable mounting plate through the motor mounting base. The eccentric rotating shaft is connected to the drive end of the stepper motor, and the bearing is sleeved on the eccentric rotating shaft. The bearing is fixedly installed at one end of the movable connecting block.

[0019] As a further improvement to the above technical solution, the material box lifting assembly includes a material tray, a lifting rack, a rotating shaft, a moving worm gear, a lifting handwheel, and a support block. The material tray is located below the gravure roller, and the lifting rack is connected to both ends of the material tray. The lifting handwheel is connected to one end of the moving worm gear. A drive gear and a transmission gear are sleeved on the rotating shaft. The drive gear meshes with the moving worm gear, and the transmission gear meshes with the lifting rack. A fixing block is provided at the connection between the transmission gear and the lifting rack. The support block is connected to the fixing block and is fixedly connected to the frame.

[0020] As a further improvement to the above technical solution, the roller passing mechanism is also provided with a color mark sensor assembly, which is arranged in parallel on both sides of the roller passing mechanism.

[0021] As a further improvement to the above technical solution, the gap coating device is also provided with a receiving tray, a drive electrical box and an operating electrical box. The receiving tray is horizontally arranged at the bottom of the frame, the drive electrical box is arranged at one end of the frame, and the operating electrical box is arranged on the other side of the frame.

[0022] The beneficial effects of this utility model are:

[0023] This invention, by setting two coating devices and two coating mechanisms on the coating devices in a secondary overprinting coating equipment, enables one-time completion of gap coating. It also allows for front-side coating followed by back-side coating, effectively solving the problem of adjusting the blank length of the gap coating. Furthermore, the length of the intermediate blank area can be adjusted arbitrarily, making it suitable for multi-process production. When producing gap coating alone, the dual coating heads can simultaneously coat the same paste, increasing the gap between the first coatings and reducing the impact of motor response speed on the coating speed. Moreover, secondary overprinting can be completed in one pass, reducing the number of unwinding and rewinding operations, lowering the difficulty of aligning the secondary overprinting coating area, improving equipment debugging efficiency, reducing energy loss, and increasing production efficiency. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the production structure of the gap coating equipment of this utility model;

[0026] Figure 2 This is a schematic diagram of the film-carrying structure of the gap coating equipment of this utility model;

[0027] Figure 3 This is a schematic diagram of the coating device of this utility model;

[0028] Figure 4 This is a side sectional view of the coating device of this utility model;

[0029] Figure 5 This is a schematic diagram of the coating mechanism of this utility model;

[0030] Figure 6 This is a schematic diagram of the gravure roller assembly of this utility model;

[0031] Figure 7 This is a schematic diagram of the scraper adjustment assembly of this utility model;

[0032] Figure 8 yes Figure 7 Enlarged view of point A in the middle;

[0033] Figure 9 yes Figure 7 Enlarged view of point B in the middle;

[0034] Figure 10 This is a structural schematic diagram of the material box lifting assembly of this utility model.

[0035] Reference numerals: 1. Unwinding device; 2. Coating device; 21. Front coating device; 22. Back coating device; 201. Frame; 202. Roller passing mechanism; 221. Coating roller; 203. Coating mechanism; 204. Gravure roller assembly; 241. Gravure roller; 242. Drive motor; 243. Bearing support seat; 244. First mounting plate; 2441. Scale; 245. First transverse guide rail; 246. Screw drive assembly; 2 461. Lead screw; 2462. Sliding pair; 2463. Bearing mounting seat; 2464. Handwheel; 205. Forward and backward moving assembly; 251. Mounting base plate; 252. Linear motor; 253. Forward and backward moving guide rail; 254. Cable chain; 255. Moving mounting plate; 206. Scraper adjusting assembly; 261. Scraper; 262. Scraper moving seat; 263. Scraper tilting assembly; 2631. Cylinder; 2632. Cylinder retaining pin; 2 633. Cylinder base; 2634. Rotary connector; 2635. Scraper fixing double-ear seat; 264. Linear sliding platform; 265. Second mounting plate; 266. Connecting seat; 267. Second transverse guide rail; 268. Moving connecting block; 269. Scraper translation drive assembly; 2691. Stepper motor; 2692. Eccentric rotating shaft; 2693. Bearing; 2694. Motor mounting seat; 207. Material box lifting assembly; 271. 1. Material tray; 272. Lifting rack; 273. Rotating shaft; 274. Moving worm gear; 275. Lifting handwheel; 276. Support block; 277. Drive gear; 278. Transmission gear; 279. Fixing block; 208. Color mark sensor assembly; 209. Receiving tray; 2010. Drive electrical box; 2011. Operation electrical box; 3. Traction device; 31. First traction device; 32. Second traction device; 4. Drying oven; 5. Winding device. Detailed Implementation

[0036] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0037] Reference Figures 1 to 4A gap coating device for secondary overprinting of lithium batteries includes: an unwinding device 1, a coating device 2, a traction device 3, an oven 4, and a rewinding device 5. The unwinding device 1, located in the middle of the gap coating device, is used to release foil. The coating device 2 includes a front coating device 21 and a back coating device 22 with identical structures. The traction device 3 includes a first traction device 31 and a second traction device 32. The first traction device 31 is located at the front end of the front coating device 21, and the second traction device 32 is located at the front end of the back coating device 22. After the unwinding device 1 unwinds the foil, the first traction device 31 guides the foil into the front coating device 21 for front coating. After the front coating is dried, the foil is then guided by the second traction device 31... The foil is introduced into the reverse coating device 22 by the unwinding device 1 for reverse coating, so as to complete the gap coating of the front and back sides of the foil at one time, reduce the number of unwinding and rewinding, reduce the difficulty of alignment of the secondary overprint coating area, and improve the equipment debugging efficiency. The oven 4 is set above the unwinding device 1 and is set as a double-layer structure. The front coating device 21 and the reverse coating device 22 are respectively set at the two ends of the oven 4, so that after the front coating is completed, it enters the lower layer of the oven 4 for drying. At the same time, the foil can also be conveyed to the reverse coating device 22 for reverse coating by the second traction device 32. After the reverse coating is completed, the foil enters the upper layer of the oven 4. The winding device 5 is set at the tail end of the gap coating equipment to wind up the coated foil. By adopting this structure that integrates gap coating and secondary overprinting, the foil is sequentially conveyed between the unwinding device 1, the first traction mechanism 31, the front coating device 21, the oven 4, the second traction device 32, the reverse coating device 22, the oven 4, and the rewinding device 5. The foil passes through the unwinding mechanism 1 and the first traction mechanism 31 into the front coating device 21. After the front foil is coated, it enters the lower layer of the oven 4 for drying. After drying, the foil passes through the second traction mechanism 31 and the reverse coating device 22 for reverse coating. Then it enters the second layer of the oven 4 for drying. After drying, the foil enters the rewinding device 5 through the rewinding traction mechanism for rewinding. This quickly completes the gap coating on both sides and improves production efficiency.

[0038] Both the front coating device 21 and the back coating device 22 include a frame 201, a roller conveying mechanism 202, and a coating mechanism 203. The roller conveying mechanism 202 is located in the middle of the frame 201 and is used to pull the foil material. The coating mechanism 203 is located on both sides of the roller conveying mechanism 202, forming two coating stations, which can realize both intermittent coating and secondary overprint coating to meet more customer needs. The coating mechanism 203 includes a gravure roller assembly 204, a front and rear moving assembly 205, a doctor blade adjusting assembly 206, and a material box lifting assembly 207. 07. The gravure roller assembly 204 includes a gravure roller 241 and a coating roller 221. The coating roller 221 is disposed on both sides of the roller-passing mechanism 202, and the gravure roller 241 is parallel and tangential to the coating roller 221. During coating, the foil is introduced from the roller-passing mechanism 202 onto the coating roller 221, and then passes between the coating roller 221 and the gravure roller 241. The gravure roller 241 can effectively coat the slurry onto the foil. At the same time, the doctor blade adjustment assembly 206 abuts against the gravure roller 241, and the material box lifting assembly 207 is disposed at the lower end of the gravure roller 241. The tray of the box lifting assembly 207 contains slurry. The gravure roller 241 rotates to form a slurry coating. The slurry on the gravure roller 241 is then evenly scraped by the scraper adjusting assembly 206 to ensure uniform foil coating. The gravure roller assembly 204 and the scraper adjusting assembly 206 are both mounted on the front-back moving assembly 205. The front-back moving assembly 205 can drive the gravure roller 241 to move back and forth. When coating is required, the front-back moving assembly 205 drives the gravure roller assembly 204 and the scraper adjusting assembly 206 to move synchronously closer to the coating roller 221, so that the gravure roller 241 and the coating roller 221 are aligned. 21. The foil is clamped for coating. When coating is not required, the forward and backward moving component 205 drives the gravure roller component 204 and the doctor blade adjusting component 206 to move away from the coating roller 221 simultaneously, leaving a blank area on the foil, thus achieving intermittent coating. In addition, the length of the intermediate blank area can be adjusted at will by controlling the reaction time of the forward and backward moving component 205, which is suitable for customers' multi-process production. It is also equipped with dual-station coating. The same paste can be set in both stations to achieve high-speed intermittent coating, or different pastes can be set to achieve secondary overprinting of foil coating. The production efficiency is high and the debugging is convenient and quick.

[0039] Reference Figure 5 , Figure 6In an embodiment of this utility model, the forward and backward moving assembly 205 includes a mounting base plate 251, a linear motor 252, a forward and backward moving guide rail 253, a cable chain 254, and a movable mounting plate 255. The linear motor 252 and the forward and backward moving guide rail 253 are connected between the mounting base plate 251 and the movable mounting plate 2055, and the forward and backward moving guide rail 253 is disposed on both sides of the linear motor 252. The linear motor 252 includes a stator and a mover, and the forward and backward moving guide rail 253 includes a slide rail and a slider. The stator and the slide rail are fixedly connected to the mounting base plate 251, and the mover and the slider are fixedly connected to the movable mounting plate 255. When the linear motor 252 is driven, the mover slides on the stator, which in turn drives the movable mounting plate 255 to slide along the front and rear moving guide rails 253. The gravure roller assembly 204 and the doctor blade adjustment assembly 206 are installed on the upper end of the movable mounting plate 255, thereby realizing the front and rear movement of the gravure roller 241, and thus adjusting the length of the blank area on the foil. The drag chain 254 is set on the outer end of the movable mounting plate 255, and one end of the drag chain 254 is connected to the mounting base plate 251, and the other end is connected to the movable mounting plate 255, ensuring that the drag chain 254 protects the wires or air pipes from damage when the coating mechanism 203 moves back and forth.

[0040] Reference Figure 6 , Figure 7 , Figure 9 In an embodiment of this utility model, the gravure roller assembly 204 further includes a drive motor 242, a bearing support 243, a first mounting plate 244, a first transverse guide rail 245, and a lead screw drive assembly 246. The first mounting plate 244 is slidably connected to the movable mounting plate 255 via the first transverse guide rail 245, allowing the gravure roller assembly 204 to be mounted on the upper end of the front-rear moving assembly 205, so that the gravure roller 241 can move back and forth. Both ends of the gravure roller 241 are fixedly connected to the first mounting plate 244 via the bearing support 243. The drive motor 242 is mounted on the upper end of the first mounting plate 244, and one end of the gravure roller 241 is connected to the drive motor 242, allowing the gravure roller to move back and forth. 241 is capable of rotation; the lead screw drive assembly 246 is mounted on the movable mounting plate 255, and the lead screw drive assembly 246 is used to drive the gravure roller 241 to move along the first transverse guide rail 245, so that the position of the gravure roller 241 can be adjusted to achieve different coating requirements; in addition, the upper end of the bearing support seat 243 is provided with an open slot, and a pressure block is provided on the open slot. One end of the pressure block is rotatably connected to one end of the open slot. The rotating bearings connected to both ends of the gravure roller 241 are engaged in the open slot. The pressure block presses on the upper end of the rotating bearing and is fixed in the bearing support seat 243 by fastening screws passing through the other end of the pressure block, so as to fix the gravure roller 241 in place and also make it easier to replace and maintain the gravure roller 241.

[0041] Specifically, the lead screw drive assembly 246 includes a lead screw 2461, a sliding pair 2462, a bearing mounting seat 2463, and a handwheel 2464. Both ends of the lead screw 2461 are mounted on the movable mounting plate 255 via the bearing mounting seat 2463. The sliding pair 2462 is sleeved on the lead screw 2461 and is fixedly connected to the first mounting plate 244. The handwheel 2464 is connected to one end of the lead screw 2461. Rotating the handwheel 2464 causes the lead screw 2461 to rotate, which in turn drives the sliding pair 2462 to move the first mounting plate 244 left and right along the first transverse guide rail 245. Furthermore, a scale 2441 is provided on the first mounting plate 244, and a pointer is provided on the bearing mounting seat 2463 at one end of the lead screw 2461 to accurately determine the distance the gravure roller 241 moves, enabling rapid adjustment.

[0042] Reference Figure 7 , Figure 8 In an embodiment of this utility model, the scraper adjustment assembly 206 includes a scraper 261, a scraper moving seat 262, a scraper flipping assembly 263, a linear sliding platform 264, a second mounting plate 265, a connecting seat 266, a second transverse guide rail 267, a moving connecting block 268, and a scraper translation drive assembly 269. The scraper 261 abuts against the gravure roller 241 to evenly distribute the slurry on the gravure roller 241. Both ends of the scraper 261 are connected to the scraper moving seat 262, which is connected to the linear sliding platform 264. The distance between the scraper 261 and the gravure roller 241 can be adjusted via the linear sliding platform 264, thereby adjusting the thickness of the slurry coating. The linear sliding platform 264 is fixed to the connecting seat 266, and the scraper flipping assembly 263 is connected to... The inner end of the scraper moving seat 262 and the scraper flipping assembly 263 are connected to the middle of the scraper 261. The scraper 261 can be controlled to abut or not abut against the gravure roller 241 through the scraper flipping assembly 263. The second mounting plate 265 is slidably connected to the movable mounting plate 255 through the second transverse guide rail 267. The connecting seat 266 is fixed on the second mounting plate 265. The scraper translation drive assembly 269 is mounted on the movable mounting plate 255. The drive end of the scraper translation drive assembly 269 is connected to the second mounting plate 265 through the movable connecting block 268. This allows the motor of the scraper translation drive assembly 269 to rotate and drive the movable connecting block 268 to move, thereby driving the scraper adjusting assembly 206 to move left and right, so as to ensure that the scraper 261 can evenly distribute the slurry on the entire gravure roller 241.

[0043] Specifically, the scraper flipping assembly 263 includes a cylinder 2631, a cylinder fixing pin 2632, a cylinder base 2633, a rotating connector 2634, and a scraper fixing double-ear seat 2635. The scraper fixing double-ear seat 2635 is fixedly connected to the scraper 261. The rotating connector 2634 has an L-shaped structure; one end of the rotating connector 2634 is hinged to the scraper fixing double-ear seat 2635, and the other end is connected to the extended end of the cylinder 2631. Both ends of the scraper 261 are connected to the cylinder base 2632. The scraper moving seat 262 is rotatably connected, and the scraper 261 can be flipped by the extension and retraction of the cylinder 2631. This can quickly and evenly distribute the paste on the gravure roller 241, and facilitate the installation and replacement of the gravure roller 241, making debugging convenient and quick. At the same time, the cylinder fixing pin 2632 is fixedly connected to the inner side of the scraper moving seat 262, and the cylinder base 2633 is hinged to one end of the cylinder fixing pin 2632. The cylinder 2631 is fixedly installed on the cylinder base 2633 to fix the cylinder 2631.

[0044] Specifically, the scraper translation drive assembly 269 includes a stepper motor 2691, an eccentric rotating shaft 2692, a bearing 2693, and a motor mounting base 2694. The stepper motor 2691 is fixed to the movable mounting plate 255 via the motor mounting base 2694. The eccentric rotating shaft 2692 is connected to the drive end of the stepper motor 2691, and the bearing 2693 is sleeved on the eccentric rotating shaft 2692. One end of the movable connecting block 268 is provided with a mounting groove, and the bearing 2693 is connected in the mounting groove. The stepper motor 2691 drives the eccentric rotating shaft 2692 to rotate, thereby driving the movable connecting block 268 to move left and right, thus realizing the left and right movement of the scraper 261.

[0045] Reference Figure 5 , Figure 10In an embodiment of this utility model, the material box lifting assembly 207 includes a material tray 271, a lifting rack 272, a rotating shaft 273, a moving worm gear 274, a lifting handwheel 275, and a support block 276. The material tray 271 is positioned below the gravure roller 241 and contains slurry; the gravure roller 241 rotates to pick up the slurry. The lifting rack 272 is connected to both ends of the material tray 271. The lifting handwheel 275 is connected to one end of the moving worm gear 274. A drive gear 277 and a transmission gear 278 are mounted on the rotating shaft 273, and the drive gear 277 meshes with the moving worm gear 274. The transmission gear 278 is meshed with the lifting rack 272. By rotating the lifting handwheel 275, the moving worm 274 is driven to rotate, causing the drive gear 277 to rotate, which in turn drives the rotating shaft 273 to rotate. At the same time, the transmission gear 278 rotates, which in turn drives the lifting rack 272 to move up and down, thereby realizing the lifting of the material box to suit different sizes of gravure rollers 241. Meanwhile, a fixing block 279 is provided at the connection between the transmission gear 278 and the lifting rack 272. The support block 276 is connected to the fixing block 279 and is fixedly connected to the frame 201 to fix the material box lifting assembly 207.

[0046] Reference Figure 3 In an embodiment of this utility model, the roller passing mechanism 202 is further provided with a color mark sensor assembly 208. The color mark sensor assembly 208 is arranged parallel to both sides of the roller passing mechanism 202 and is used to detect the alignment of the coating on the front and back of the foil to ensure the coating quality of the foil.

[0047] Reference Figure 3 In an embodiment of this utility model, the gap coating device is further provided with a receiving tray 209, a drive electrical box 2010, and an operation electrical box 2011. The receiving tray 209 is horizontally arranged at the bottom of the frame 201 and can receive the dripping slurry to avoid slurry waste. The drive electrical box 2010 is arranged at one end of the frame 201 and is used to install electrical components such as motors and reducers. The operation electrical box 2011 is arranged on the other side of the frame 201 and is used to install the mechanical electrical components to realize the overall control of the device, which is convenient and quick.

[0048] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A gap coating device for secondary overprinting of lithium batteries, characterized in that, include: An unwinding device, used to release the foil, is located in the middle of the intermittent coating equipment; A coating apparatus includes a front coating apparatus and a back coating apparatus. Both the front and back coating apparatuses include a frame and a roller-passing mechanism and a coating mechanism mounted on the frame. The coating mechanism is located on both sides of the roller-passing mechanism. Each coating mechanism includes a gravure roller assembly, a forward / backward moving assembly, a doctor blade adjusting assembly, and a material box lifting assembly. The gravure roller assembly and the doctor blade adjusting assembly are both mounted on the forward / backward moving assembly, which drives them to move forward and backward. The gravure roller assembly includes a gravure roller and a coating roller. The coating roller is located on both sides of the roller-passing mechanism and is tangent to the gravure roller. The doctor blade adjusting assembly abuts against the gravure roller. The material box lifting assembly is located at the lower end of the gravure roller and provides slurry to the gravure roller. The doctor blade adjusting assembly evenly distributes the slurry on the gravure roller. The traction device includes a first traction device and a second traction device, wherein the first traction device is disposed at the front end of the front coating device and the second traction device is disposed at the front end of the reverse coating device. An oven is positioned above the unwinding device, and the front coating device and the back coating device are respectively positioned at both ends of the oven. A winding device, used to wind up coated foil, is located at the tail end of the intermittent coating equipment; Foil material is conveyed sequentially between the unwinding device, the first traction mechanism, the front coating device, the oven, the second traction device, the back coating device, the oven, and the rewinding device.

2. The gap coating equipment for secondary overprinting of lithium batteries according to claim 1, characterized in that, The forward and backward moving assembly includes a mounting base plate, a linear motor, forward and backward moving guide rails, a cable chain, and a movable mounting plate. The linear motor and the forward and backward moving guide rails are connected between the mounting base plate and the movable mounting plate. The forward and backward moving guide rails are located on both sides of the linear motor. The cable chain is located at the outer end of the movable mounting plate, with one end of the cable chain connected to the mounting base plate and the other end of the cable chain connected to the movable mounting plate.

3. The gap coating equipment for secondary overprinting of lithium batteries according to claim 2, characterized in that, The gravure roller assembly further includes a drive motor, a bearing support, a first mounting plate, a first transverse guide rail, and a screw drive assembly. The first mounting plate is slidably connected to the movable mounting plate via the first transverse guide rail. Both ends of the gravure roller are fixedly connected to the first mounting plate via the bearing support. The drive motor is mounted on the upper end of the first mounting plate, and one end of the gravure roller is connected to the drive motor. The screw drive assembly is mounted on the movable mounting plate and is used to drive the gravure roller to move along the first transverse guide rail.

4. The gap coating equipment for secondary overprinting of lithium batteries according to claim 3, characterized in that, The lead screw drive assembly includes a lead screw, a sliding pair, a bearing mounting base, and a handwheel. The two ends of the lead screw are mounted on the movable mounting plate through the bearing mounting base. The sliding pair is sleeved on the lead screw and is fixedly connected to the first mounting plate. The handwheel is connected to one end of the lead screw.

5. The gap coating equipment for secondary overprinting of lithium batteries according to claim 2, characterized in that, The scraper adjustment assembly includes a scraper, a scraper moving seat, a scraper flipping assembly, a linear sliding platform, a second mounting plate, a connecting seat, a second transverse guide rail, a moving connecting block, and a scraper translation drive assembly. The scraper abuts against the gravure roller. Both ends of the scraper are connected to the scraper moving seat. The scraper moving seat is connected to the linear sliding platform, which is fixed to the connecting seat. The scraper flipping assembly is connected to the inner end of the scraper moving seat and to the middle of the scraper. The second mounting plate is slidably connected to the moving mounting plate via the second transverse guide rail. The connecting seat is fixed to the second mounting plate. The scraper translation drive assembly is mounted on the moving mounting plate, and its drive end is connected to the second mounting plate via the moving connecting block.

6. The gap coating equipment for secondary overprinting of lithium batteries according to claim 5, characterized in that, The scraper flipping assembly includes a cylinder, a cylinder fixing pin, a cylinder base, a rotating connector, and a scraper fixing double ear seat. The scraper fixing double ear seat is fixedly connected to the scraper. One end of the rotating connector is hinged to the scraper fixing double ear seat, and the other end of the rotating connector is connected to the protruding end of the cylinder. The cylinder fixing pin is fixedly connected to the inner side of the scraper moving seat. The cylinder base is hinged to one end of the cylinder fixing pin, and the cylinder is fixedly mounted on the cylinder base.

7. The gap coating equipment for secondary overprinting of lithium batteries according to claim 5, characterized in that, The scraper translation drive assembly includes a stepper motor, an eccentric rotating shaft, a bearing, and a motor mounting base. The stepper motor is fixed to the movable mounting plate via the motor mounting base. The eccentric rotating shaft is connected to the drive end of the stepper motor, and the bearing is sleeved on the eccentric rotating shaft. The bearing is fixedly installed at one end of the movable connecting block.

8. The gap coating equipment for secondary overprinting of lithium batteries according to claim 1, characterized in that, The material box lifting assembly includes a material tray, a lifting rack, a rotating shaft, a moving worm gear, a lifting handwheel, and a support block. The material tray is located below the gravure roller. Both ends of the material tray are connected to the lifting rack. The lifting handwheel is connected to one end of the moving worm gear. A drive gear and a transmission gear are sleeved on the rotating shaft. The drive gear meshes with the moving worm gear, and the transmission gear meshes with the lifting rack. A fixing block is provided at the connection between the transmission gear and the lifting rack. The support block is connected to the fixing block and is fixedly connected to the frame.

9. The gap coating equipment for secondary overprinting of lithium batteries according to claim 1, characterized in that, The roller-passing mechanism is also equipped with a color mark sensor assembly, which is arranged parallel to both sides of the roller-passing mechanism.

10. The gap coating equipment for secondary overprinting of lithium batteries according to claim 1, characterized in that, The gap coating device is also equipped with a receiving tray, a drive box, and an operating box. The receiving tray is horizontally arranged at the bottom of the frame, the drive box is located at one end of the frame, and the operating box is located on the other side of the frame.

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