Coating type new energy battery diaphragm, coating device and coating process thereof

Abstract

The invention relates to a coating type new energy battery diaphragm, a coating device and a coating process thereof, and relates to the technical field of battery diaphragm coating equipment, the coating type new energy battery diaphragm comprises a coating frame, a conveying piece for conveying and detecting a battery diaphragm, and a spraying assembly, a brushing assembly and a drying assembly for spraying, brushing and drying the battery diaphragm; the spraying assembly comprises three material pumping pipes and distance sensors which are fixed to the coating frame, a coating pipe and a spraying pipe which are movably arranged on the coating frame, a telescopic pipe communicating with the coating pipe, a switching piece used for switching and opening the three material pumping pipes, and an adjusting piece used for adjusting the amount of coating liquid in the telescopic pipe. According to the application, the switching of the coating material and the scraping block and the adjustment of the coating amount and the hot air amount can be automatically completed, the coating effect of different battery diaphragms is ensured, the intelligent linkage mechanism of the coating device is improved, and the switching of the coating material and the scraping block and the adjustment of the height of the spray head, the coating amount and the hot air amount can be completed at a time.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery separator coating equipment, in particular to a coated new energy battery separator, a coating device and a coating process thereof. BACKGROUND

[0002] The battery separator is a key component between the positive electrode and the negative electrode in a lithium ion battery. The battery separator is mainly used in electronic batteries, energy storage batteries and power batteries according to different application scenarios. The thickness of the battery separator on the electronic battery needs to be controlled within 4-12 mu to ensure the lightness and miniaturization of the electronic battery. The thickness of the battery separator on the energy storage battery needs to be controlled within 12-20 mu to balance the energy density and safety of the energy storage battery. The thickness of the battery separator on the power battery needs to be controlled within 20-40 mu to ensure the high current discharge requirement of the power battery.

[0003] In the production and processing of the battery separator, in order to ensure the service life of the battery, the front and back surfaces of the battery separator usually need to be coated. The front surface of the battery separator on the electronic battery needs to be coated with boehmite, the front surface of the battery separator on the energy storage battery needs to be coated with aluminum oxide, and the front surface of the battery separator on the power battery needs to be coated with aramid. The back surface of the battery separator on the electronic battery, the energy storage battery and the power battery needs to be coated with polyvinylidene fluoride. According to the different materials coated on the battery separator, the spraying amount of different materials needs to be accurately controlled. The spraying amount of aluminum oxide slurry needs to be the most, the spraying amount of aramid slurry needs to be the least, and the spraying amount of boehmite slurry needs to be moderate. When the battery separator is coated, the slurry needs to be sprayed on the battery separator, then the sprayed slurry needs to be coated, and finally the slurry needs to be dried.

[0004] According to the related technology in the above, the inventors believe that the following defects exist: when different types of battery separators are coated and processed, different coating materials need to be used, and the height, coating amount, different scraping blocks and hot air volume of the coating nozzle also need to be adjusted according to the different coating materials. However, the switching of the coating materials and the scraping blocks and the adjustment of the coating amount and the hot air volume of the existing coating device mainly rely on manual operation, and it is difficult to automatically adjust the related process parameters according to the types of different battery separators. The workers need to switch the coating materials and the scraping blocks and adjust the coating amount and the hot air volume according to the types of different battery separators. This not only has low adjustment efficiency, but also increases the labor intensity of the workers, and has high fault tolerance. If the workers adjust the coating materials, the scraping blocks, the coating amount or the hot air volume incorrectly, it will not only affect the quality of the battery separator coating, but also cause the damage of the battery separator, increase the scrap rate of the battery separator, and cannot guarantee the coating effect of different battery separators. SUMMARY

[0005] To address the issue that existing coating devices rely heavily on manual operation for switching coating materials and scrapers, as well as adjusting coating amount and hot air volume, and that it is difficult to automatically adjust relevant process parameters according to different types of battery separators, requiring operators to switch coating materials and scrapers and adjust coating amount and hot air volume based on different types of battery separators, this application provides a coating-type new energy battery separator, a coating device, and a coating process thereof.

[0006] This application provides a coated new energy battery separator, a coating device, and a coating process, which adopts the following technical solution: A coating device for a coated new energy battery separator includes a coating rack, a conveyor for conveying and inspecting the battery membrane, and a spraying assembly, a wiping assembly, and a drying assembly for spraying, brushing, and drying the battery membrane. The spraying assembly includes three material extraction tubes and a distance sensor fixed on the coating frame, a coating tube and a spraying tube movably mounted on the coating frame, a telescopic tube connected to the coating tube, a switching component for switching the three material extraction tubes, an adjusting component for adjusting the amount of coating liquid in the telescopic tube, and a lifting component for adjusting the height of the coating tube. The distance sensor is located below the battery film. The wiping assembly includes three wiping plates rotatably mounted on the coating frame, a wiping strip movably mounted on the coating frame, a rotating component for switching and adjusting the three wiping plates, and a translation component for driving the three wiping plates and the wiping strip to translate. The three wiping plates are a polycrystalline diamond plate, a polyurethane plate, and a tungsten carbide plate, respectively, and the wiping strip is a cemented carbide plate. The drying assembly includes a blower pipe fixed on the coating rack, an air outlet pipe movably disposed on the coating rack, and a control component for adjusting the amount of hot air in the blower pipe. The coating rack is also equipped with a synchronizing component for synchronously driving the switching component, adjusting component, and lifting component, as well as a driving component for lifting the spray pipe, brush strip, and air outlet pipe. The control component is automatically driven by the rotating component.

[0007] By adopting the above technical solutions, different battery separators are currently processed using different coating materials. It is necessary to precisely control the height of the spray nozzle, the amount of coating material sprayed, the scraper of coating material, and the amount of hot air for drying. However, the existing coating device has a weak intelligent linkage mechanism, which cannot complete the switching of coating materials and scrapers, as well as the adjustment of nozzle height, coating amount, and hot air volume in one go. This makes it difficult to guarantee the consistency of various switching and adjustment, requiring precise inspection by staff, resulting in low battery separator coating efficiency. The battery film needing coating processing can be conveyed by the conveying piece. In the conveying process, the distance sensor can detect the thickness of the battery film, and then detect the type of the battery, whether it is an electronic battery, an energy storage battery or a power battery. The upper and lower parts of the battery film can be coated by the spraying assembly. According to the type of the battery film, the coating material on the upper part of the battery film can be switched, and the coating amount of the coating material can be controlled according to the type of the battery film. The distance between the coating pipe and the battery film can be adjusted according to the different coating materials on the battery film, so as to ensure the coating effect of different types of battery films. The brushing assembly can brush the coated battery film, so as to uniformly coat the slurry on the upper and lower parts of the battery film on the battery film. According to the different materials of the slurry on the upper part of the battery film, the corresponding brushing plate can be switched to brush the corresponding material. The drying assembly can dry the brushed battery film. According to the different coating materials on the battery film, the hot air amount can be adjusted to ensure the drying effect of different battery films. The synchronous piece and the control piece can switch the coating material and the scraping block, and adjust the height of the spray head, the coating amount and the hot air amount. The driving piece can adjust the distance between the spraying pipe, the brushing strip and the air outlet pipe and the battery film according to the different types of battery films, so as to avoid the influence of the thickness of the battery film on the spraying, brushing and drying effects of the spraying pipe, the brushing strip and the air outlet pipe on the lower part of the battery film.

[0008] Optionally, the switching piece includes control valves fixed on the three material extraction pipes respectively, torsional springs and fixed gears fixed on the three control valves respectively, and a fixed rack movably arranged on the coating frame. The three torsional springs are fixedly connected with the three fixed gears respectively, and the three fixed gears are movably engaged with the fixed rack.

[0009] By adopting the above technical scheme, the switching piece can switch the three material extraction pipes to be opened, so as to coat different slurries on the upper parts of different types of battery films. When the synchronous piece drives the fixed rack to translate, the fixed rack can be sequentially engaged with and driven to rotate by the three fixed gears, so that the torsional springs are in a compressed state, the control valves are opened to the material extraction pipes, the slurry in the storage box can flow into the telescopic pipe through the material extraction pipe, and the subsequent material spraying is completed. When the fixed rack is separated from the fixed gear, the fixed gear can be automatically driven to rotate by the rebound force of the torsional spring, so that the control valve is closed to the material extraction pipe. The fixed gear can only open one material extraction pipe at a time, so as to spray the corresponding slurry according to the type of the battery film.

[0010] Optionally, the adjusting piece includes an adjusting block movably arranged in the telescopic pipe, an active rod fixed on the adjusting block, an annular spring fixed on the active rod, a material extraction pump fixed on the telescopic pipe, and an active wedge block movably arranged on the coating frame. The annular spring is fixedly connected with the telescopic pipe. The active rod is movably abutted with the inclined surface of the active wedge block. The telescopic pipe is provided with a fixed groove. The right side of the adjusting block and the inner wall of the telescopic pipe are provided with a slurry gap.

[0011] By adopting the above technical scheme, the adjusting piece can control the spraying amount of the slurry according to the different needs of spraying slurry material above the battery film. When the synchronous piece drives the adjusting piece to drive the movable wedge to move, the movable rod and the movable wedge can be sequentially driven to move left and right by the slope abutment and the elastic force of the annular spring, and then the adjusting block can adjust the size of the slurry gap in the telescopic pipe when it moves left and right, so as to control the amount of sprayed slurry according to the type of the battery film, and at the same time, polyvinylidene fluoride slurry can be sprayed below the battery film.

[0012] Optionally, the lifting piece includes a fixed wedge fixed to the coating pipe, two fixed cylinders fixed to the coating frame, telescopic springs respectively fixed in the two fixed cylinders, sliding rods respectively fixed to the two telescopic springs, and a fixed rod movably arranged on the coating frame. The two sliding rods are fixedly connected with the coating pipe, and the fixed rod is movably abutted with the slope of the fixed wedge.

[0013] By adopting the above technical scheme, the lifting piece can control the distance between the coating pipe and the battery film according to the different needs of spraying slurry material above the battery film. When the synchronous piece drives the lifting piece to drive the fixed rod to move, the coating pipe and the two sliding rods can be sequentially driven to move up and down by the slope abutment of the fixed rod and the fixed wedge and the elastic force of the two telescopic springs. Then, the distance between the coating pipe and the battery film can be adjusted when the coating pipe moves up and down, so as to adjust the height of the coating pipe according to the type of the slurry.

[0014] Optionally, the rotating piece includes a movable wheel rotatably arranged on the coating frame, two fixed blocks, a first circular rod and a second circular rod, and a servo motor fixed to the coating frame. The two fixed blocks are fixed to the front and rear sides of the movable wheel respectively. The first circular rod and the second circular rod are both provided with a fixed square groove. The two fixed blocks are slidably connected with the two fixed square grooves respectively. The three wiping plates are movably connected with the movable wheel. The first circular rod is fixedly connected with the output shaft of the servo motor.

[0015] By adopting the above technical scheme, the rotating piece can switch the corresponding wiping plate to wipe the slurry above the battery film according to the different needs of spraying slurry material above the battery film. The servo motor can sequentially drive the first circular rod, the movable gear, the second circular rod, the two fixed blocks, the movable wheel and the three wiping plates to rotate, so as to complete the switching of the three wiping plates, so as to wipe the slurry with the corresponding wiping plate according to different slurries.

[0016] Optionally, the translation component includes a disc fixed to a movable wheel, a first U-shaped frame and a second U-shaped frame movably mounted on a coating rack, and an electric push rod fixed to the coating rack. The first U-shaped frame and the second U-shaped frame are both rotatably connected to the disc. The first U-shaped frame is fixedly connected to the output end of the electric push rod, and the second U-shaped frame is movably connected to the wiping brush strip.

[0017] By adopting the above technical solution, the translation component can wipe the slurry sprayed above or below the battery film to achieve uniform coating of the battery film. The electric push rod can sequentially drive the first U-shaped frame, disc, movable wheel, two fixed blocks, three wiping plates and wiping strips to move back and forth. When the wiping plates move back and forth, they can wipe and scrape the slurry above the battery film. When the wiping strips move back and forth, they can wipe and scrape the polyvinylidene fluoride slurry below the battery film to facilitate uniform coating of the slurry on the battery film.

[0018] Optionally, the control component includes a compression spring fixed to the air blower, a wedge block fixed to the compression spring, an air regulating block fixed to the wedge block, a movable rack slidably disposed on the coating frame, and a movable gear fixed to the first round rod. The movable gear meshes with the movable rack, the movable rack movably abuts against the inclined surface of the wedge block, and an air passage gap is provided between the bottom of the air regulating block and the inner wall of the air blower.

[0019] By adopting the above technical solution, the control component can dry the slurry coated on the top and bottom of the battery film. At the same time, the hot air volume can be adjusted according to the different slurry materials sprayed on the top of the battery film. When the synchronization component drives the control component to move the movable rack, the movable rack abuts against the inclined surface of the wedge block and, in conjunction with the elastic force of the compression spring, can sequentially drive the wedge block and the air regulating block to move up and down. Thus, when the air regulating block moves, it can adjust the size of the air gap in the air blowing pipe, so as to control the hot air volume according to the different types of slurry on the top of the battery film. At the same time, it can dry the polyvinylidene fluoride slurry sprayed on the bottom of the battery film.

[0020] Optionally, the synchronizing element includes a threaded rod rotatably mounted on the coating rack, a threaded block movably mounted on the coating rack, and a motor fixed on the coating rack. The threaded rod is threadedly connected to the threaded block, and the threaded rod is fixedly connected to the output end of the motor. The drive wheel is fixedly connected to the threaded rod. The fixed rack and the movable wedge are both fixedly connected to the threaded block. The fixed rod is fixedly connected to the movable wedge. The motor and the servo motor are both electrically connected to the distance sensor.

[0021] By adopting the above technical solution, the synchronizing component can simultaneously switch the coating material and scraper, as well as adjust the nozzle height, coating amount, and hot air volume according to the different types of battery films. The motor can drive the threaded rod to rotate, which in turn can sequentially drive the threaded block, fixed rack, movable wedge, and fixed rod to move back and forth. When the threaded rod rotates, it can sequentially drive the driving wheel, transmission belt, driven wheel, first round rod, movable gear, second round rod, two fixed blocks, movable wheel, and three brush plates to rotate. When the movable gear rotates, it can drive the movable rack to move left and right. When the fixed rack moves back and forth, it can sequentially mesh with the three fixed gears and drive them to rotate, thus completing the consistency of various switching and adjustment.

[0022] A coating process for a coated new energy battery separator includes the following steps: S1. The conveyor can convey the battery film. During the conveying process, the distance sensor can detect whether the battery film is used on an electronic battery, an energy storage battery, or a power battery. The distance sensor will transmit the signal to the electric motor, the servo motor, and the electric telescopic rod. The drive unit adjusts the height of the spray pipe, the brush strip, and the air outlet pipe. S2. The electric motor can drive the threaded rod to rotate, which in turn drives the threaded block, fixed rack, movable wedge and fixed rod to move back and forth in sequence. The servo motor can drive the first round rod, movable gear, second round rod, two fixed blocks, movable wheel and three brush plates to rotate in sequence, which in turn drives the movable rack to move left and right. When the fixed rack moves back and forth, it can mesh with the three fixed gears in sequence and drive them to rotate, so that the torsion spring is in a compressed state, so that the corresponding control valve opens the corresponding material extraction pipe. With the help of the adjustment component, the corresponding slurry can be sprayed on the battery film according to the different types of battery film. S3. When the movable wedge moves, it works in conjunction with the elastic force of the ring spring to adjust the size of the slurry gap in the telescopic tube, and the amount of slurry can be controlled according to the different types of battery films. S4. When the fixed rod moves, it works with the elastic force of two telescopic springs to adjust the height of the coating tube according to the type of slurry. When the three brush plates rotate and switch, it is convenient to use the corresponding brush plate to wipe the slurry according to different slurries. When the movable rack moves, it works with the inclined surface of the wedge block and the elastic force of the compression spring to control the hot air volume according to the type of slurry above the battery film. S5. When the battery film is used in an energy storage battery, an energy storage battery film with an alumina layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. When the battery film is used in an electronic battery, an electronic battery film with a boehmite layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. When the battery film is used in a power battery, a power battery film with an aramid layer on top and a polyvinylidene fluoride layer on the bottom can be obtained.

[0023] By adopting the above technical solution, the switching of coating materials and scrapers, as well as the adjustment of coating amount and hot air volume, can be completed automatically, ensuring the coating effect of different battery separators. This improves the intelligent linkage mechanism of the coating device, enabling the switching of coating materials and scrapers, as well as the adjustment of nozzle height, coating amount and hot air volume, to be completed in one go. This ensures the consistency of each switching and adjustment, and improves the coating effect of different types of battery films.

[0024] A coated new energy battery separator, wherein the battery membrane is prepared by a coating process of a coated new energy battery separator, the thickness of the energy storage battery membrane is 16μm, the thickness of the electronic battery membrane is 8μm, and the thickness of the power battery membrane is 30μm.

[0025] By adopting the above technical solutions, the thickness of the energy storage battery membrane is controlled at 16μm, with an aluminum oxide layer on top and a polyvinylidene fluoride layer on the bottom. This provides the energy storage battery membrane with a physical barrier, enhances thermal stability, and provides double protection against thermal runaway. The thickness of the electronic battery membrane is controlled at 8μm, with a boehmite layer on top and a polyvinylidene fluoride layer on the bottom. This reduces the proportion of inactive materials in the electronic battery membrane and increases the volumetric energy density of the battery. The thickness of the power battery membrane is controlled at 30μm, with an aramid layer on top and a polyvinylidene fluoride layer on the bottom. This provides the power battery membrane with extreme physical protection and provides double protection for the safe operation of the power battery.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The conveyor unit enables the transport of the battery film. During transport, the switching unit, in conjunction with the distance sensor and the synchronization unit, can spray the corresponding slurry above the battery film according to its type, ensuring the coating effect on different battery films and avoiding the use of the wrong slurry, which would affect the protection of the battery and reduce the scrap rate of the battery film. The adjusting unit, in conjunction with the synchronization unit, can evenly spray the slurry above the battery film being transported and evenly spray the polyvinylidene fluoride slurry below the battery film being transported. At the same time, it can control the amount of slurry sprayed according to the type of battery film, and control the thickness of the slurry coating above the battery film, avoiding excessive slurry spraying which would increase costs and insufficient slurry spraying which would not achieve the desired coating effect. The lifting unit, in conjunction with the synchronization unit, can adjust the height of the coating tube according to the type of slurry, to ensure the coating effect of different slurries on different battery films, avoiding the problem of low viscosity slurry causing spots and other defects on the battery film when the nozzle is too low, and avoiding high viscosity slurry causing stringing or breakage on the battery film when the nozzle is too high. 2. The rotating and translating components can brush and smooth the slurry above and below the battery film, ensuring even coating. Different brushes can be used for different slurries to guarantee effective application on different battery films, preventing mismatched brushes from scraping incompatible slurries, reducing brush wear, and ensuring coating uniformity and high yield. The control components, in conjunction with the rotating components, can further smooth the coated slurry above and below the battery film. The polyvinylidene fluoride slurry is dried rapidly to increase the speed of battery film coating. At the same time, the hot air volume can be controlled according to the different types of slurry on the battery film to ensure the drying effect of the slurry on the battery film. Excessive hot air volume will cause the coating on the battery separator to crack, curl, and warp, while insufficient hot air volume will cause residual slurry on the battery separator. The drive unit, together with the distance sensor, can control the distance between the spray pipe, the brush strip, and the air outlet pipe and the battery film to ensure the effect of spraying, brushing, and drying of polyvinylidene fluoride slurry under the battery film. 3. The distance sensor can detect whether the current battery film is used on an electronic battery, an energy storage battery, or a power battery. When the battery film is used on an energy storage battery, it can automatically switch to alumina slurry for coating, maximizing the amount of alumina slurry sprayed and minimizing the distance between the coating tube and the battery film. It also automatically switches to a polycrystalline diamond scraper to brush the alumina slurry, maximizing the hot air volume. When the battery film is used on an electronic battery, it can automatically switch to boehmite slurry for coating, maximizing the amount of boehmite slurry sprayed and minimizing the distance between the coating tube and the battery film. It also automatically switches to a tungsten carbide scraper to brush the boehmite slurry, maximizing the hot air volume. When the battery membrane is used on a power battery, the coating can be automatically switched to use aramid slurry, minimizing the amount of aramid slurry sprayed and maximizing the distance between the coating tube and the battery membrane. The polyurethane scraper can also be automatically switched to brush the aramid slurry, minimizing the amount of hot air. Through these methods, the switching of coating materials and scrapers, as well as the adjustment of coating amount and hot air volume, can be automatically completed, ensuring the coating effect of different battery membranes. This improves the intelligent linkage mechanism of the coating device, enabling the switching of coating materials and scrapers, as well as the adjustment of nozzle height, coating amount, and hot air volume, all in one operation. This ensures consistency in all switching and adjustment, improving the coating effect of different types of battery membranes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is an external view of the support plate connection structure in the embodiments of this application; Figure 3 This is an external view of the coating tube connection structure in the embodiments of this application; Figure 4This is a cross-sectional view of the fixed cylinder connection structure in an embodiment of this application; Figure 5 This is an external view of the air blower connection structure in the embodiments of this application; Figure 6 This is an external view of the threaded rod connection structure in the embodiments of this application; Figure 7 This is an external view of the movable wheel connection structure in an embodiment of this application.

[0028] Reference numerals: 1. Coating rack; 2. Battery film; 3. Coating tube; 4. Spray tube; 5. Movable wheel; 6. Wiping brush; 7. Air blower; 8. Motor; 9. Threaded rod; 10. Threaded block; 11. Fixed rack; 12. Material extraction tube; 13. Control valve; 14. Fixed gear; 15. Torsion spring; 16. Telescopic tube; 17. Fixed rod; 18. Material extraction pump; 19. Movable wedge; 20. Fixed wedge; 21. Adjusting block; 22. Ring spring; 23. Movable rod; 24. Fixed cylinder; 25. Telescopic spring; 6. Sliding rod; 27. Servo motor; 28. Support plate; 29. ​​Electric telescopic rod; 30. First round rod; 31. Movable gear; 32. Movable rack; 33. Distance sensor; 34. Intelligent controller; 35. Second round rod; 36. Electric push rod; 37. First U-shaped frame; 38. Second U-shaped frame; 39. Wiping strip; 40. Fixed block; 41. Wedge block; 42. Compression spring; 43. Air regulating block; 44. Air outlet pipe; 45. Disc; 46. Limiting roller; 47. Film take-up machine; 48. Film release machine. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0030] This application discloses a coating apparatus for a coated new energy battery separator, referring to... Figure 1 and Figure 2The system includes a coating rack 1, a conveyor for conveying and inspecting the battery film 2, and a spraying assembly, a brushing assembly, and a drying assembly for spraying, brushing, and drying the battery film 2. The spraying assembly includes three extraction tubes 12 fixed on the coating rack 1 and a distance sensor 33, a coating tube 3 and a spraying tube 4 movably mounted on the coating rack 1, a telescopic tube 16 connected to the coating tube 3, a switching component for switching the opening and closing of the three extraction tubes 12, an adjusting component for adjusting the amount of coating liquid in the telescopic tube 16, and a lifting component for adjusting the height of the coating tube 3. The distance sensor 33 is located below the battery film 2. The brushing assembly includes three brush plates 6 rotatably mounted on the coating rack 1 and a movable brush plate 6. The coating rack 1 includes a wiping strip 39, a rotating component for switching and adjusting the three wiping plates 6, and a translation component for driving the translation of the three wiping plates 6 and the wiping strip 39. The three wiping plates 6 are polycrystalline diamond plate, polyurethane plate, and tungsten carbide plate, respectively, and the wiping strip 39 is a cemented carbide plate. The drying assembly includes a blower pipe 7 fixed on the coating rack 1, an air outlet pipe 44 movably set on the coating rack 1, and a control component for adjusting the hot air volume in the blower pipe 7. The coating rack 1 is also equipped with a synchronizing component for synchronously driving the switching component, the adjusting component, and the lifting component, and a driving component for lifting the spray pipe 4, the wiping strip 39, and the air outlet pipe 44. The control component is automatically driven by the rotating component.

[0031] The conveying components include a film feeding machine 48 and a film taking machine 47 mounted on the coating frame 1, and two limiting rollers 46 fixed on the coating frame 1. Both limiting rollers 46 are located above the battery film 2 and are movably attached to the battery film 2. The film feeding machine 48 and the film taking machine 47 are both wound around the battery film 2.

[0032] The switching component includes control valves 13 fixed to the three extraction pipes 12, torsion springs 15 and fixed gears 14 fixed to the three control valves 13, a fixed rack 11 movably mounted on the coating frame 1, and storage boxes (not shown in the figure) connected to the three extraction pipes 12. The three torsion springs 15 are fixedly connected to the three fixed gears 14, and the three fixed gears 14 are movably meshed with the fixed rack 11. The three storage boxes are aramid box, boehmite box and alumina box, respectively. Aramid slurry, boehmite slurry and alumina slurry can be stored in the aramid box, boehmite box and alumina box, respectively.

[0033] The adjusting components include an adjusting block 21 movably disposed within the telescopic tube 16, a movable rod 23 fixed to the adjusting block 21, an annular spring 22 fixed to the movable rod 23, a material pump 18 fixed to the telescopic tube 16, and a movable wedge 19 movably disposed on the coating rack 1. The annular spring 22 is fixedly connected to the telescopic tube 16, and the movable rod 23 movably abuts against the inclined surface of the movable wedge 19. A fixing groove is provided inside the telescopic tube 16, and the adjusting block 21 is slidably connected to the fixing groove. A connecting hole is provided on the telescopic tube 16, and the movable rod 23 is slidably connected to the connecting hole. A slurry gap is provided between the right side of the adjusting block 21 and the inner wall of the telescopic tube 16, so that no slurry exists in the material pump 12 when the material pump 18 is not driven.

[0034] The lifting component includes a fixed wedge 20 fixed to the coating tube 3, two fixed cylinders 24 fixed to the coating frame 1, telescopic springs 25 fixed inside the two fixed cylinders 24 respectively, sliding rods 26 fixed to the two telescopic springs 25 respectively, and a fixed rod 17 movably disposed on the coating frame 1. Both sliding rods 26 are fixedly connected to the coating tube 3. Each of the two fixed cylinders 24 has a sliding hole with the same diameter as the sliding rod 26. The two sliding rods 26 are slidably connected to the two sliding holes respectively. The fixed rod 17 is movably abutting against the inclined surface of the fixed wedge 20.

[0035] The rotating components include a movable wheel 5 rotatably mounted on the coating rack 1, two fixed blocks 40, a first round rod 30 and a second round rod 35, and a servo motor 27 fixed on the coating rack 1. The two fixed blocks 40 are fixed to the front and rear sides of the movable wheel 5, respectively. The first round rod 30 and the second round rod 35 are each provided with a fixed square groove. The two fixed blocks 40 are slidably connected to the two fixed square grooves, respectively. The three wiping plates 6 are movably connected to the movable wheel 5 by screws, which can ensure the stability of the connection between the wiping plates 6 and the movable wheel 5 and prevent the wiping plates 6 from falling off during use. At the same time, the wiping plates 6 can be disassembled, replaced or cleaned. The three wiping plates 6 are arranged at equal distances on the outer circumference of the movable wheel 5. The movable wheel 5 can be supported by the two fixed blocks 40 and the two fixed square grooves, respectively. At the same time, the first round rod 30 and the second round rod 35 can drive the movable wheel 5 to rotate. The first round rod 30 is fixedly connected to the output shaft of the servo motor 27.

[0036] The translation component includes a disc 45 fixed to the movable wheel 5, a first U-shaped frame 37 and a second U-shaped frame 38 movably mounted on the coating frame 1, and an electric push rod 36 fixed to the coating frame 1. The first U-shaped frame 37 and the second U-shaped frame 38 are rotatably connected to the disc 45. The first U-shaped frame 37 is fixedly connected to the output end of the electric push rod 36. The second U-shaped frame 38 is movably connected to the brush strip 39 by bolts, which can ensure the stability of the connection between the brush strip 39 and the second U-shaped frame 38 and prevent the brush strip 39 from falling off during use. At the same time, the brush strip 39 can be disassembled, replaced or cleaned. Through the U-shaped limiting setting of the first U-shaped frame 37 and the second U-shaped frame 38, as well as the limiting sliding of the two fixed square blocks 40 and the two fixed square grooves, the three brush plates 6 and the brush strip 39 can be translated when the disc 45 rotates.

[0037] The control components include a compression spring 42 fixed to the air blower 7, a wedge block 41 fixed to the compression spring 42, an air regulating block 43 fixed to the wedge block 41, a movable rack 32 slidably mounted on the coating rack 1, a movable gear 31 fixed to the first round rod 30, and a hot air blower (not shown in the figure) connected to the air blower 7. The movable gear 31 meshes with the movable rack 32, and the movable rack 32 movably abuts against the inclined surface of the wedge block 41. A storage groove is provided on the inner side of the air blower 7, and the air regulating block 43 is slidably connected to the storage groove. A fixing hole is provided on the air blower 7, and the wedge block 41 is slidably connected to the fixing hole. A dovetail groove is provided on the coating rack 1, and the dovetail groove is slidably connected to the movable rack 32 to provide support when the movable rack 32 slides. An air passage gap is provided between the bottom of the air regulating block 43 and the inner wall of the air blower 7.

[0038] The synchronizing components include a threaded rod 9 rotatably mounted on the coating frame 1, a threaded block 10 movably mounted on the coating frame 1, and a motor 8 fixed on the coating frame 1. The threaded rod 9 is threadedly connected to the threaded block 10, and the threaded rod 9 is fixedly connected to the output end of the motor 8. The fixed rack 11 and the movable wedge 19 are both fixedly connected to the threaded block 10. The fixed rod 17 is fixedly connected to the movable wedge 19. Two dovetail bars are fixedly connected to the coating frame 1, and both dovetail bars are slidably connected to the threaded block 10. The two dovetail bars can ensure the stability of the translation of the threaded block 10, and at the same time restrict the circumferential rotation of the threaded block 10. The coating frame 1 has an elongated hole, and the movable wedge 19 is slidably connected to the elongated hole. The motor 8 and the servo motor 27 are both electrically connected to the distance sensor 33.

[0039] The driving components include a support plate 28 movably mounted on the coating rack 1, an electric telescopic rod 29 fixed to the coating rack 1, and a suction pump and a polyvinylidene fluoride box (not shown in the figure) fixed to the spray pipe 4. The support plate 28 is fixedly connected to the output end of the electric telescopic rod 29. The air outlet pipe 44 and the spray pipe 4 are both fixedly connected to the support plate 28. A dovetail block is fixedly connected to the support plate 28, and the dovetail block is slidably connected to the brush strip 39. The dovetail block can limit the movement of the brush strip 39. When the support plate 28 is raised or lowered, it can also drive the brush strip 39 to rise or fall. At the same time, the second U-shaped frame 38 can drive the brush strip 39 to move horizontally on the support plate 28. Four telescopic rods are fixedly connected to the coating rack 1. All four telescopic rods are fixedly connected to the support plate 28. The telescopic rods are composed of a solid inner rod and a hollow outer rod. The telescopic rods can ensure the stability of the raising and lowering of the support plate 28. The thickness of the battery separators used in electronic batteries, energy storage batteries, and power batteries does not differ significantly. Therefore, the range of movement of the electric telescopic rod 29, which drives the support plate 28, the brush strip 39, and the second U-shaped frame 38, is not large. Consequently, the second U-shaped frame 38 will not separate from the disc 45, and its translation will not be affected. The air outlet 44 is connected to another air outlet of the hot air blower. The connection between the air outlet 44 and the hot air blower is made through a flexible hose, which enables the air outlet 44 to have a telescopic function. The polyvinylidene fluoride slurry can be stored in the polyvinylidene fluoride box. The battery film 2 is located between the blowing pipe 7 and the air outlet 44. The battery film 2 is located between the coating pipe 3 and the spraying pipe 4. The battery film 2 is located between the movable wheel 5 and the brush strip 39. Both the coating pipe 3 and the spraying pipe 4 are connected to evenly distributed nozzles. The electric telescopic rod 29 is electrically connected to the distance sensor 33.

[0040] A smart controller 34 is fixedly connected to the coating rack 1. The distance sensor 33, film feeding machine 48, film taking machine 47, hot air blower, electric telescopic rod 29, electric motor 8, servo motor 27, electric push rod 36, suction pump and extraction pump 18 are all electrically connected to the smart controller 34. The smart controller 34 can control the timed opening and closing of the distance sensor 33, film feeding machine 48, film taking machine 47, hot air blower, electric telescopic rod 29, electric motor 8, servo motor 27, electric push rod 36, suction pump and extraction pump 18.

[0041] When scraping the boehmite slurry on the battery separator of an electronic battery, a tungsten carbide scraper should be used because it contains nano-sized boehmite particles with moderate abrasiveness, and the Vickers hardness of tungsten carbide can easily resist the wear of the boehmite particles. When scraping the alumina slurry on the battery separator of an energy storage battery, a polycrystalline diamond scraper should be used because alumina slurry has high solids content and high abrasiveness, and the alumina particles themselves have extremely high hardness, which polycrystalline diamond can easily resist the wear of the alumina particles. When scraping the aramid slurry on the battery separator of a power battery, a polycrystalline diamond scraper should be used. Polyurethane scrapers are used because polyurethane is elastic and can withstand the slurry in aramid slurry while effectively scraping the material. When scraping polyvinylidene fluoride (PVDF) on battery separators, hard alloy scrapers must be used. PVDF is a polymer solution dissolved in the slurry and does not contain any solid particles, so it produces almost no wear. Therefore, when scraping the coating material on the battery separator, it is necessary to switch to the appropriate scraper depending on the material being scraped. Using an incompatible scraper to scrape an incompatible slurry will cause the scraper to wear out quickly, resulting in blade lines and affecting coating uniformity and yield.

[0042] Power batteries need to balance high energy density, high power output, and safety under extreme conditions. Aramid has ultra-high heat resistance and mechanical strength, which can significantly improve the puncture resistance of the separator and is suitable for extreme conditions such as fast charging and high temperature. Aramid coating can improve the compatibility between the separator and the electrolyte, reduce the battery internal resistance, and increase energy density and power density. It has a low dielectric constant and can maintain excellent electrical insulation, further improving the battery's cycle life and charging speed. Therefore, the front side of the power battery usually needs to be coated with aramid.

[0043] Energy storage batteries require long-term stable operation and have extremely high requirements for cycle life and safety. Alumina has excellent chemical inertness and thermal stability. It can maintain the integrity of the separator at 180°C, which is much higher than the melting and cracking temperature of uncoated PE separators. Its high temperature resistance can effectively prevent thermal runaway of batteries in high-temperature environments. The alumina coating can neutralize free HF in the electrolyte, suppress gas generation during cell circulation, and reduce acid-base side reactions, thereby improving the acid resistance and safety performance of the battery. Therefore, the front side of energy storage batteries usually needs to be coated with alumina.

[0044] Electronic batteries strive for high energy density and long cycle life while also prioritizing safety. Boehmite, as an inorganic coating material, possesses excellent heat resistance and mechanical strength, effectively suppressing thermal shrinkage of the separator at high temperatures and preventing short circuits between the positive and negative electrodes. Its puncture resistance prevents burrs generated during the cutting of the positive electrode material from puncturing the separator, thus improving battery safety. Boehmite has a simple preparation process, lower production costs than alumina, and offers high coating smoothness and low internal resistance, which is beneficial for improving the energy density and cycle performance of the battery. Therefore, the front side of electronic batteries is usually coated with boehmite.

[0045] Regardless of the battery type, the negative electrode is the most unstable part of the battery because lithium dendrites can grow and puncture the separator, causing volume expansion. During charging and discharging, these dendrites expand and contract significantly, leading to damage to the electrode structure. Polyvinylidene fluoride (PVDF) acts like glue, tightly bonding the separator and the active material of the negative electrode together, suppressing volume changes and preventing electrode pulverization. It also has good affinity for the electrolyte, facilitating ion transport. As a binder, PVDF effectively improves the adhesion between the electrode and the separator, reducing macroscopic defects such as separator wrinkles, thereby lowering the risk of uneven internal resistance distribution and improving battery consistency and cycle stability. The PVDF layer has minimal impact on the battery's electrochemical performance and may even reduce internal resistance due to the closer proximity of the electrodes after hot pressing. Therefore, the reverse side of electronic batteries, energy storage batteries, and power batteries typically needs to be coated with PVDF.

[0046] Boehmite slurry is coated onto the battery separator of the electronic battery. The spraying amount of boehmite slurry needs to be controlled at 2-3 g / m³. 2 Because boehmite has a nanosheet structure, these sheet particles can overlap and spread out to a certain extent during coating, just like laying tiles. The packing density of this sheet structure is higher than that of spherical alumina, but not as efficient as aramid nanonetworks. Therefore, the amount required to form an effective coating is between the two, saving material compared to alumina, but requiring more material than aramid.

[0047] Alumina slurry is coated onto the battery separator of the energy storage battery. The spraying amount of alumina slurry needs to be controlled at 4-6 g / m³. 2 Alumina consists of rigid spherical or irregularly shaped micron / nano particles. After coating and drying, these hard particles have a large number of pores between them. This stacking method results in very high porosity. To form a continuous, complete physical barrier that can effectively prevent thermal shrinkage and dendrite penetration, a sufficient amount of coating must be applied to allow the particles to accumulate to a sufficient thickness. If the amount used is too small, the coating will be thin and discontinuous, failing to provide protection.

[0048] Aramid slurry is coated onto the battery separator of the power battery. The spraying amount of aramid slurry needs to be controlled at 1-2 g / m. 2 Aramid is a nanoscale long fiber. During the coating and drying process, these fibers intertwine and entangle with each other to form a porous three-dimensional network structure. This nanofiber network is extremely tough, and its mechanical strength and thermal stability per unit weight far exceed those of ceramic particles. Therefore, only a very small amount is needed to form a thin and dense coating that is both heat-resistant and puncture-resistant. Using too much will increase costs and clog the pores of the diaphragm.

[0049] When coating the battery separator of an electronic battery with boehmite slurry, the distance between the nozzle and the battery separator needs to be controlled at 10-15cm. This is because boehmite slurry has shear-thinning properties, and its rheological properties are between those of aramid slurry and alumina slurry. Boehmite slurry needs a certain gap to ensure leveling, but it cannot be too large to avoid loss of control. A moderate gap can avoid stringing like alumina and splashing like aramid, which is the optimal solution for achieving uniform coating. Its slurry viscosity is between the two, which determines that its optimal coating gap must also be the middle value.

[0050] When coating the battery separator of an energy storage battery with alumina slurry, the distance between the nozzle and the battery separator needs to be controlled at about 5-10cm. This is because the alumina slurry is rich in solid particles, similar to toothpaste, and has extremely poor fluidity and high shear stress. If the nozzle is too high, the high-viscosity slurry will be stretched by the downward-moving separator after being squeezed out of the slit, which can easily cause stringing. Subsequently, the stringing will break, resulting in discontinuity and breakage of the coating. Low-height spraying helps to maintain the uniformity of the coating, improve heat resistance, and overcome the cohesive force of the high-viscosity slurry with the smallest gap, thus achieving stable transfer.

[0051] When coating the battery separator of a power battery with aramid slurry, the distance between the nozzle and the battery separator needs to be controlled at 15cm-20cm. This is because aramid slurry has low viscosity. Aramid is usually a dispersion of nanofibers in an aqueous or slurry system. It has good fluidity, similar to milk or light cream, and very weak cohesion. If the nozzle is too low, the low-viscosity slurry will be subjected to severe shearing and splashing under the high-speed movement of the separator, resulting in defects such as spots and comet tails on the coating and contaminating the equipment. The maximum gap is used to avoid excessive shearing of the low-viscosity slurry, prevent splashing, and ensure the uniformity of the coating.

[0052] When drying alumina slurry, boehmite slurry, and aramid slurry on battery separators, precise control of the hot air volume is necessary to ensure the evaporation rate and drying uniformity of the slurry. Excessive hot air volume can lead to cracking, curling, warping, and surface skinning of the coating on the battery separator. Insufficient hot air volume can result in residual slurry on the battery separator, coating sagging, and low drying efficiency, thus affecting the quality of the battery separator coating. Therefore, the total amount of slurry to be evaporated is the largest when drying alumina slurry, thus requiring the most heat. When drying boehmite slurry, the total amount of slurry to be evaporated is moderate, thus requiring a moderate amount of hot air. When drying aramid slurry, the total amount of slurry to be evaporated is the smallest, thus requiring the least amount of hot air.

[0053] The implementation principle of the coating device for a coated new energy battery separator in this application embodiment is as follows: (1) The battery film 2 can be conveyed by the film feeding machine 48 and the film taking machine 47. The smoothness of the battery film 2 can be ensured by the tight positioning of the two limiting rollers 46. (2) During the conveying of the battery film 2, the slurry can be sequentially drawn into the telescopic tube 16 and the coating tube 3 by the suction pump 18. Multiple nozzles on the coating tube 3 will evenly spray the slurry above the conveying battery film 2. The polyvinylidene fluoride slurry in the polyvinylidene fluoride box can be drawn into the spraying tube 4 by the suction pump. Multiple nozzles on the spraying tube 4 will evenly spray the polyvinylidene fluoride slurry below the conveying battery film 2. Thus, the top and bottom of the battery film 2 can be sprayed and fed. After the battery film 2 is sprayed, the first U-shaped frame 37, the disc 45, the movable wheel 5, the two fixed blocks 40, the three wiping plates 6 and the wiping strip 39 can be sequentially moved back and forth by the electric push rod 36. The wiping plates 6 move back and forth. The slurry on the top of the battery film 2 can be wiped and smoothed. When the wiping strip 39 moves back and forth, it can wipe and smooth the polyvinylidene fluoride slurry below the battery film 2, so that the slurry can be evenly coated on the battery film 2. After the slurry on the battery film 2 is wiped, hot air can be blown into the air blower 7 and the air outlet 44 in sequence by the hot air blower. The air blower 7 will blow hot air on the top of the battery film 2, which can quickly dry the slurry coated on the top of the battery film 2. The air outlet 44 will blow hot air on the bottom of the battery film 2, which can quickly dry the polyvinylidene fluoride slurry coated on the bottom of the battery film 2, thereby improving the coating speed of the battery film 2. Finally, the coated battery film 2 is rolled up to complete the coating process of the battery film 2. (3) The motor 8 drives the threaded rod 9 to rotate, which in turn drives the threaded block 10, the fixed rack 11, the movable wedge 19 and the fixed rod 17 to move back and forth in sequence. At the same time, the servo motor 27 drives the first round rod 30, the movable gear 31, the second round rod 35, the two fixed blocks 40, the movable wheel 5 and the three brush plates 6 to rotate in sequence. When the movable gear 31 rotates, it drives the movable rack 32 to move left and right. When the fixed rack 11 moves back and forth, it can mesh with the three fixed gears 14 in sequence and rotate, so that the torsion spring 15 is in a compressed state. Then, when the fixed gear 14 rotates, it can open the control valve 13 to open the material extraction pipe 12, so that the slurry in the storage box can flow into the telescopic pipe 16 through the material extraction pipe 12. After the subsequent spraying, when the fixed rack 11 separates from the fixed gear 14, the fixed gear 14 loses its meshing force. Therefore, the rebound force of the torsion spring 15 can automatically drive the fixed gear 14 to rotate, causing the control valve 13 to close the extraction pipe 12. This prevents the slurry in the two extraction pipes 12 from mixing when switching, so that the fixed gear 14 can only open one extraction pipe 12 at a time. In this way, the movement position of the fixed rack 11 can be controlled to open the corresponding extraction pipe 12, so that the corresponding slurry can be sprayed on the battery film 2 according to the different types of battery film 2, ensuring the coating effect of different battery film 2, avoiding the use of the wrong slurry on the battery film 2, affecting the battery protection effect, and reducing the scrap rate of the battery film 2. (4) When the movable wedge 19 moves, the movable rod 23 abuts against the inclined surface of the movable wedge 19 and the elastic force of the ring spring 22 can sequentially drive the movable rod 23 and the adjusting block 21 to move left and right. When the adjusting block 21 moves, it can adjust the size of the slurry gap in the telescopic tube 16 so as to control the amount of slurry sprayed according to the different types of battery film 2, control the thickness of the slurry coating above the battery film 2, avoid excessive slurry spraying causing increased costs, and avoid insufficient slurry spraying failing to achieve the coating effect of battery film 2. (5) When the fixed rod 17 moves, the fixed rod 17 abuts against the inclined surface of the fixed wedge block 20 and cooperates with the elastic force of the two telescopic springs 25 to drive the coating tube 3 and the two sliding rods 26 to move up and down in sequence. When the coating tube 3 moves up and down, the distance between the coating tube 3 and the battery film 2 can be adjusted so as to adjust the height of the coating tube 3 according to the different types of slurry, so as to ensure the coating effect of different slurries on different battery films 2, avoid the low viscosity slurry caused by the nozzle being too low to cause defects such as spots on the battery film 2, and avoid the high viscosity slurry caused by the nozzle being too high to cause stringing or breakage on the battery film 2. (6) When the movable wheel 5 drives the three wiping plates 6 to rotate, the three wiping plates 6 can be switched so that the corresponding wiping plate 6 can be used to wipe the slurry according to different slurries, so as to ensure the wiping effect of different slurries on different battery films 2, avoid mismatched scrapers scraping mismatched slurries, reduce the probability of scraper wear, and ensure coating uniformity and yield. (7) When the movable rack 32 moves, the movable rack 32 abuts against the inclined surface of the wedge block 41 and cooperates with the elastic force of the compression spring 42, which can drive the wedge block 41 and the air regulating block 43 to move up and down in sequence. Then, when the air regulating block 43 moves, it can adjust the size of the air gap in the blower pipe 7 so as to control the amount of hot air according to the different types of slurry on the battery membrane 2, so as to ensure the drying effect of the slurry on the battery membrane 2, avoid excessive hot air volume causing the coating on the battery separator to crack, curl and warp, and avoid insufficient hot air volume causing residual slurry on the battery separator. (8) After the distance sensor 33 detects the type of battery film 2, the electric telescopic rod 29 can sequentially drive the support plate 28, spray pipe 4, brush strip 39 and air outlet pipe 44 to move up and down, thereby controlling the distance between the spray pipe 4, brush strip 39 and air outlet pipe 44 and the battery film 2, ensuring the effect of spraying, brushing and drying of polyvinylidene fluoride slurry under the battery film 2; (9) During the transfer of battery film 2, the distance sensor 33 first detects the distance to detect the thickness of battery film 2, and then detects whether the current battery film 2 is used for electronic battery, energy storage battery or power battery. When it is detected that the thickness of battery film 2 is suitable for energy storage battery, the fixed rack 11 will mesh with the fixed gear 14 on the alumina box, and then open the suction pipe 12 connected to the alumina box. Then, when the suction pump 18 is driven, the alumina slurry in the alumina box can be sprayed onto the battery film 2 for coating. The movable rod 23 will fit with the position where the width of the movable wedge 19 is the smallest, and then the slurry gap in the telescopic tube 16 is the largest, and then the amount of alumina slurry sprayed is also larger. The fixed rod 17 will fit with the fixed wedge 20 The highest position is in contact with each other, so the distance between the coating tube 3 and the battery film 2 is the closest. When the movable wheel 5 rotates, the polycrystalline diamond scraper can be in contact with the battery film 2. The polycrystalline diamond scraper can be used to wipe the alumina slurry. The movable rack 32 will be in contact with the lowest position of the wedge block 41, so the air gap in the air blowing tube 7 is the largest, and the hot air volume is also larger. Therefore, when the battery film 2 is used on the energy storage battery, the alumina slurry can be automatically switched for coating, so that the amount of alumina slurry sprayed is controlled to the maximum, the distance between the coating tube 3 and the battery film 2 is controlled to the closest, and the polycrystalline diamond scraper is automatically switched to wipe the alumina slurry, so that the hot air volume is controlled to the maximum, and a battery film 2 with an alumina layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. (10) When the thickness of the battery film 2 is detected to be suitable for the electronic battery, the fixed rack 11 will mesh with the fixed gear 14 on the boehmite box, thereby opening the suction pipe 12 connected to the boehmite box. Then, when the suction pump 18 is driven, the boehmite slurry in the boehmite box can be sprayed onto the battery film 2 for coating. The movable rod 23 will be in contact with the middle position of the inclined surface of the movable wedge 19, thereby making the slurry gap in the telescopic tube 16 appropriate, and the amount of boehmite slurry sprayed is also appropriate. The fixed rod 17 will be in contact with the middle position of the inclined surface of the fixed wedge 20, thereby making the distance between the coating tube 3 and the battery film 2 appropriate. 5. When rotating, the tungsten carbide scraper can be brought into contact with the battery film 2. The tungsten carbide scraper can be used to brush the boehmite slurry. The movable rack 32 will be in contact with the middle position of the wedge block 41, so that the air gap in the blower pipe 7 is moderate, and the hot air volume is also moderate. When the battery film 2 is used on an electronic battery, the boehmite slurry can be automatically switched for coating, so that the spraying amount of boehmite slurry is controlled at a moderate level, the distance between the coating pipe 3 and the battery film 2 is controlled at a moderate level, and the tungsten carbide scraper is automatically switched to brush the boehmite slurry, so that the hot air volume is controlled at a moderate level, and a battery film 2 with a boehmite layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. (11) When the thickness of the battery film 2 is detected to be suitable for the power battery, the fixed rack 11 will mesh with the fixed gear 14 on the aramid box, thereby opening the suction pipe 12 connected to the aramid box. Then, when the suction pump 18 is driven, the aramid slurry in the aramid box can be sprayed onto the battery film 2 for coating. The movable rod 23 will be in contact with the position with the widest width of the movable wedge 19, thereby minimizing the slurry gap in the telescopic tube 16, and thus reducing the amount of aramid slurry sprayed. The fixed rod 17 will be in contact with the lowest position of the fixed wedge 20, thereby maximizing the distance between the coating tube 3 and the battery film 2. The movable wheel 5 When rotating, the polyurethane scraper can be brought into contact with the battery film 2, and the polyurethane scraper can be used to wipe the aramid slurry. The movable rack 32 will be in contact with the highest position of the wedge block 41, so that the air gap in the blower pipe 7 is minimized, and the amount of hot air is also less. Therefore, when the battery film 2 is used on the power battery, the aramid slurry can be automatically switched for coating, so that the amount of aramid slurry sprayed is controlled to the minimum, the distance between the coating pipe 3 and the battery film 2 is controlled to the maximum, and the polyurethane scraper is automatically switched to wipe the aramid slurry, so that the amount of hot air is controlled to the minimum, and a battery film 2 with an aramid layer on top and a polyvinylidene fluoride layer on the bottom can be obtained.

[0054] This application also discloses a coating process for a coated new energy battery separator, based on a coating device for a coated new energy battery separator, including the following steps: S1. The conveyor can convey the battery film 2. During the conveying, the distance sensor 33 can detect whether the battery film 2 is used on an electronic battery, an energy storage battery or a power battery. The distance sensor 33 will transmit the signal to the motor 8, the servo motor 27 and the electric telescopic rod 29. The drive unit adjusts the height of the spray pipe 4, the brush strip 39 and the air outlet pipe 44. S2. The motor 8 can drive the threaded rod 9 to rotate, which can sequentially drive the threaded block 10, the fixed rack 11, the movable wedge 19 and the fixed rod 17 to move back and forth. The servo motor 27 can sequentially drive the first round rod 30, the movable gear 31, the second round rod 35, the two fixed blocks 40, the movable wheel 5 and the three brush plates 6 to rotate, which in turn drives the movable rack 32 to move left and right. When the fixed rack 11 moves back and forth, it can sequentially mesh with the three fixed gears 14 and rotate, so that the torsion spring 15 is in a compressed state, so that the corresponding control valve 13 opens the corresponding material extraction pipe 12. With the help of the adjustment component, the corresponding slurry can be sprayed above the battery film 2 according to the different types of battery film 2. S3. When the movable wedge 19 moves, it works with the elastic force of the ring spring 22 to adjust the size of the slurry gap in the telescopic tube 16, and the amount of slurry can be controlled according to the different types of battery film 2. S4. When the fixed rod 17 moves, it works with the elastic force of the two telescopic springs 25 to adjust the height of the coating tube 3 according to the type of slurry. When the three brush plates 6 rotate and switch, they can be used to brush the slurry according to the corresponding brush plate 6. When the movable rack 32 moves, it works with the inclined surface of the wedge block 41 and the elastic force of the compression spring 42 to control the hot air volume according to the type of slurry above the battery film 2. S5. When the battery membrane 2 is used in an energy storage battery, an energy storage battery membrane 2 with an aluminum oxide layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. When the battery membrane 2 is used in an electronic battery, an electronic battery membrane 2 with a boehmite layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. When the battery membrane 2 is used in a power battery, a power battery membrane 2 with an aramid layer on top and a polyvinylidene fluoride layer on the bottom can be obtained.

[0055] A coated new energy battery separator has the following characteristics: the thickness of the energy storage battery membrane 2 is 16 μm, the thickness of the electronic battery membrane 2 is 8 μm, and the thickness of the power battery membrane 2 is 30 μm. The 16 μm thickness of the energy storage battery membrane 2, with an alumina layer on top and a polyvinylidene fluoride layer on the bottom, provides a physical barrier, enhances thermal stability, and offers dual protection against thermal runaway, ensuring the effective protection of the energy storage battery. The 8 μm thickness of the electronic battery membrane 2, with a boehmite layer on top and a polyvinylidene fluoride layer on the bottom, reduces the proportion of inactive materials, increases the volumetric energy density of the battery, and ensures the effective protection of the electronic battery. The 30 μm thickness of the power battery membrane 2, with an aramid layer on top and a polyvinylidene fluoride layer on the bottom, provides extreme physical protection, offering dual protection for the safe operation of the power battery and ensuring the effective protection of the power battery.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A coating device for a coated new energy battery separator, characterized in that: It includes a coating rack (1), a conveyor for conveying and inspecting the battery film (2), and a spraying assembly, a brushing assembly and a drying assembly for spraying, brushing and drying the battery film (2). The spraying assembly includes three extraction tubes (12) and a distance sensor (33) fixed on the coating frame (1), a coating tube (3) and a spraying tube (4) movably set on the coating frame (1), a telescopic tube (16) connected to the coating tube (3), a switching component for switching the three extraction tubes (12) on and off, an adjusting component for adjusting the amount of coating liquid in the telescopic tube (16), and a lifting component for adjusting the height of the coating tube (3). The distance sensor (33) is located below the battery film (2). The wiping assembly includes three wiping plates (6) rotatably mounted on the coating frame (1), a wiping strip (39) movably mounted on the coating frame (1), a rotating component for switching and adjusting the three wiping plates (6), and a translation component for driving the three wiping plates (6) and the wiping strip (39) to translate. The three wiping plates (6) are polycrystalline diamond plate, polyurethane plate and tungsten carbide plate, respectively, and the wiping strip (39) is a cemented carbide plate. The drying assembly includes a blower pipe (7) fixed on the coating rack (1), an air outlet pipe (44) movably disposed on the coating rack (1), and a control component for adjusting the amount of hot air in the blower pipe (7); The coating rack (1) is also provided with a synchronizing component for synchronously driving the switching component, adjusting component and lifting component, and a driving component for lifting the spray pipe (4), brush strip (39) and air outlet pipe (44). The control component is automatically driven by the rotating component.

2. The coating apparatus for a coated new energy battery separator according to claim 1, characterized in that: The switching component includes control valves (13) fixed on three extraction pipes (12), torsion springs (15) and fixed gears (14) fixed on the three control valves (13), and a fixed rack (11) movably mounted on the coating rack (1). The three torsion springs (15) are fixedly connected to the three fixed gears (14), and the three fixed gears (14) are movably engaged with the fixed rack (11).

3. The coating device for a coated new energy battery separator according to claim 1, characterized in that: The adjusting component includes an adjusting block (21) movably disposed inside the telescopic tube (16), a movable rod (23) fixed on the adjusting block (21), an annular spring (22) fixed on the movable rod (23), a material pump (18) fixed on the telescopic tube (16), and a movable wedge (19) movably disposed on the coating rack (1). The annular spring (22) is fixedly connected to the telescopic tube (16), the movable rod (23) is in movable contact with the inclined surface of the movable wedge (19), and a slurry gap is provided between the right side of the adjusting block (21) and the inner wall of the telescopic tube (16).

4. The coating apparatus for a coated new energy battery separator according to claim 2, characterized in that: The lifting component includes a fixed wedge (20) fixed on the coating tube (3), two fixed cylinders (24) fixed on the coating frame (1), telescopic springs (25) fixed in the two fixed cylinders (24) respectively, sliding rods (26) fixed on the two telescopic springs (25) respectively, and a fixed rod (17) movably set on the coating frame (1). The two sliding rods (26) are fixedly connected to the coating tube (3), and the fixed rod (17) movably abuts against the inclined surface of the fixed wedge (20).

5. The coating apparatus for a coated new energy battery separator according to claim 4, characterized in that: The rotating component includes a movable wheel (5) rotatably mounted on the coating rack (1), two fixed blocks (40), a first round rod (30) and a second round rod (35), and a servo motor (27) fixed on the coating rack (1). The two fixed blocks (40) are respectively fixed on the front and rear sides of the movable wheel (5). The first round rod (30) and the second round rod (35) are each provided with a fixed square groove. The two fixed blocks (40) are slidably connected to the two fixed square grooves respectively. The three wiping plates (6) are all movably connected to the movable wheel (5). The first round rod (30) is fixedly connected to the output shaft of the servo motor (27).

6. The coating apparatus for a coated new energy battery separator according to claim 1, characterized in that: The translation component includes a disc (45) fixed on a movable wheel (5), a first U-shaped frame (37) and a second U-shaped frame (38) movably mounted on a coating rack (1), and an electric push rod (36) fixed on the coating rack (1). The first U-shaped frame (37) and the second U-shaped frame (38) are rotatably connected to the disc (45). The first U-shaped frame (37) is fixedly connected to the output end of the electric push rod (36), and the second U-shaped frame (38) is movably connected to the brush strip (39).

7. The coating apparatus for a coated new energy battery separator according to claim 1, characterized in that: The control components include a compression spring (42) fixed on the air blower (7), a wedge block (41) fixed on the compression spring (42), an air regulating block (43) fixed on the wedge block (41), a movable rack (32) slidably disposed on the coating rack (1), and a movable gear (31) fixed on the first round rod (30). The movable gear (31) meshes with the movable rack (32), and the movable rack (32) moves against the inclined surface of the wedge block (41). An air passage gap is provided between the bottom of the air regulating block (43) and the inner wall of the air blower (7).

8. The coating apparatus for a coated new energy battery separator according to claim 5, characterized in that: The synchronizing element includes a threaded rod (9) rotatably mounted on the coating rack (1), a threaded block (10) movably mounted on the coating rack (1), and a motor (8) fixed on the coating rack (1). The threaded rod (9) is threadedly connected to the threaded block (10), and the threaded rod (9) is fixedly connected to the output end of the motor (8). The fixed rack (11) and the movable wedge (19) are both fixedly connected to the threaded block (10). The fixed rod (17) is fixedly connected to the movable wedge (19). The motor (8) and the servo motor (27) are both electrically connected to the distance sensor (33).

9. A coating process for a coated new energy battery separator, based on a coating apparatus for a coated new energy battery separator as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. The conveyor can convey the battery film (2). During the conveying, the distance sensor (33) can detect whether the battery film (2) is used on an electronic battery, an energy storage battery or a power battery. The distance sensor (33) will transmit the signal to the motor (8), the servo motor (27) and the electric telescopic rod (29). The drive unit adjusts the height of the spray pipe (4), the brush strip (39) and the air outlet pipe (44). S2. The motor (8) can drive the threaded rod (9) to rotate, and can sequentially drive the threaded block (10), fixed rack (11), movable wedge (19) and fixed rod (17) to move back and forth. The servo motor (27) can sequentially drive the first round rod (30), movable gear (31), second round rod (35), two fixed blocks (40), movable wheel (5) and three brush plates (6) to rotate, thereby driving the movable rack (32) to move left and right. When the fixed rack (11) moves back and forth, it can sequentially mesh with the three fixed gears (14) and drive them to rotate, so that the torsion spring (15) is in a compressed state, so that the corresponding control valve (13) opens the corresponding material extraction pipe (12). With the help of the adjustment component, the corresponding slurry can be sprayed above the battery film (2) according to the different types of battery film (2). S3. When the movable wedge (19) moves, it works with the elastic force of the ring spring (22) to adjust the size of the slurry gap in the telescopic tube (16) and control the amount of slurry according to the different types of battery membrane (2); S4. When the fixed rod (17) moves, it works with the elastic force of two telescopic springs (25) to adjust the height of the coating tube (3) according to the type of slurry. When the three brush plates (6) rotate and switch, it is convenient to use the corresponding brush plate (6) to brush the slurry according to different slurries. When the movable rack (32) moves, it works with the inclined surface of the wedge block (41) and the elastic force of the compression spring (42) to control the hot air volume according to the type of slurry above the battery film (2). S5. When the battery membrane (2) is used on an energy storage battery, an energy storage battery membrane (2) with an alumina layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. When the battery membrane (2) is used on an electronic battery, an electronic battery membrane (2) with a boehmite layer on top and a polyvinylidene fluoride layer on the bottom can be obtained. When the battery membrane (2) is used on a power battery, a power battery membrane (2) with an aramid layer on top and a polyvinylidene fluoride layer on the bottom can be obtained.

10. A coated new energy battery separator, characterized in that, The battery film (2) is prepared by the process described in claim 9. The thickness of the energy storage battery film (2) is 16 μm, the thickness of the electronic battery film (2) is 8 μm, and the thickness of the power battery film (2) is 30 μm.

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