A double-sided coating device for lithium battery separators

Abstract

The present application belongs to the technical field of lithium battery manufacturing, and particularly relates to a double-sided coating device for lithium battery diaphragm, which comprises an unwinding mechanism, the lithium battery diaphragm is unwound to the preheating mechanism by the unwinding mechanism for preheating, the preheated lithium battery diaphragm enters the micro-concave positive coating mechanism for front surface coating through the positive coating traction mechanism, and enters the rotary reverse coating mechanism for reverse surface spraying through the reverse coating traction mechanism, the double-sided coated lithium battery diaphragm is pulled into the winding mechanism by the winding traction mechanism, and is wound by the winding mechanism, the lithium battery diaphragm is completed with double-sided coating through a continuous production line once from unwinding to winding, the production cycle is greatly shortened, the energy consumption and cost are reduced, and the micro-concave positive coating mechanism and the rotary reverse coating mechanism can give the lithium battery diaphragm two different excellent functions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lithium battery manufacturing, and particularly relates to a lithium battery separator double-sided coating device. BACKGROUND

[0002] As a core power source in the field of new energy today, the safety, energy density and cycle life of lithium batteries put high requirements on the performance of separators. As a key component, the lithium battery separator bears the core functions of isolating the positive and negative electrodes and ensuring ion conduction. The existing coating device for lithium battery separators is mostly single-sided coating. If the lithium battery separator needs to be coated on both sides, secondary processing is required, which increases the production cycle, energy consumption and cost.

[0003] For example, a Chinese patent with application number CN202410068678.7 discloses a lithium battery separator surface coating device and method, which includes a coating support frame, the left and right ends of the coating support frame are parallelly provided with horizontal conveying rollers, and further includes a center coating roller parallelly arranged between the horizontal conveying rollers on both sides, the center coating roller is uniformly surrounded by a plurality of embedded adjustment grooves in a circumferential manner in the middle, and the inside of the center coating roller is provided with a hollow sleeve, the inside and outside of the embedded adjustment grooves are respectively provided through the inside and outside surfaces of the center coating roller. However, this technical solution has the disadvantage of single-sided coating device. If the lithium battery separator needs to be coated on both sides, secondary processing is required, which increases the production cycle, energy consumption and cost. SUMMARY

[0004] The purpose of the present application is to provide a lithium battery separator double-sided coating device to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A lithium battery separator double-sided coating device includes an unwinding mechanism that unwinds the lithium battery separator into a preheating mechanism for preheating. The preheated lithium battery separator enters a micro-concave positive coating mechanism through a positive coating traction mechanism for positive coating, and enters a rotary negative coating mechanism through a negative coating traction mechanism for negative coating. The double-sided coated lithium battery separator is drawn into a winding mechanism by a winding traction mechanism and is wound by the winding mechanism.

[0006] Further, the preheating mechanism is provided with a bellows mechanism at the upper end, and the double-sided coated lithium battery separator enters the bellows mechanism for drying.

[0007] Further, the micro-concave positive coating mechanism includes a solution tank, a textured roller is rotatably connected in the solution tank, a motor one is fixed on the side of the solution tank, the output end of the motor one is connected with the textured roller, and a liquid inlet and a liquid outlet are arranged on the side of the solution tank.

[0008] Further, the solution tank is provided with a scraper assembly, the scraper assembly comprises a center round rod, three scrapers are fixed on the center round rod at equal intervals, both ends of the center round rod are rotationally connected with a circular support, the center round rod is slidably connected with a push rod one, the push rod one is fixedly connected with a clamping block, the clamping block is clamped in a clamping groove arranged on the circular support, and a spring one is arranged between the clamping block and the center round rod.

[0009] Further, the lower end of the circular support is fixedly connected with a rotating rod, the lower end of the rotating rod is rotationally connected with a supporting rod, the supporting rod is fixed on the side of the solution tank, the circular support is connected with an output end of a cylinder one, and the end of the cylinder one is rotationally connected with the solution tank.

[0010] Further, the side of the solution tank is provided with a cleaning assembly, the cleaning assembly comprises a supporting plate, the supporting plate is fixed on the side of the solution tank, a supporting frame is fixed on the upper end of the supporting plate, a cylinder two is fixed on the supporting plate, an output end of the cylinder two is fixedly connected with a moving block through a push rod two, and the push rod two is slidably connected with the supporting frame.

[0011] Further, a cylinder three is fixed on the supporting plate, an output end of the cylinder three is rotationally connected with one end of a bent support, the other end of the bent support is slidably connected with an end of a moving plate, the middle of the bent support is rotationally connected with the supporting frame, the moving plate is fixedly connected with a housing through a push rod three, and the push rod three is slidably connected with the moving block.

[0012] Further, the housing is slidably connected with an arc-shaped brush, a cavity one is arranged between the housing and the arc-shaped brush, a cavity two is arranged in the arc-shaped brush, bristles and micropores are arranged on the arc-shaped surface of the arc-shaped brush, the cavity two is communicated with the outside through the micropores, the housing is connected with a water inlet pipe, a through hole is arranged between the cavity one and the cavity two, a piston is fixed in the housing, the front end of the piston is located in the cavity two, the front end of the piston is sealed at the through hole, a spring two is arranged on the piston, and the two ends of the spring two are respectively abutted against the housing and the arc-shaped brush.

[0013] Further, the rotating and reverse coating mechanism comprises a support two, a screw rod support one is fixed on the support two, a servo motor one is fixed on the end of the screw rod support one, an output end of the servo motor one is connected with a screw rod one, the screw rod one is rotationally arranged in the screw rod support one, the screw rod one is threadedly connected with the end of a screw rod support two, the end of the screw rod support two is slidably arranged in the screw rod support one, a screw rod two is rotationally connected in the screw rod support two, a rotating wheel is fixed on the end of the screw rod two, the rotating wheel is connected with an output end of a servo motor two through a belt, the servo motor two is fixed on the side of the screw rod support two, the screw rod two is threadedly connected with a sliding block, the sliding block is slidably arranged in the screw rod support two, and the sliding block is fixedly connected with the motor two.

[0014] Further, the motor two output end is connected with the runner two, the runner two is connected with the rotating body through the belt two, the rotating body rotates in the fixed body lower end, the fixed body is fixed on the slider side, the fixed body side is connected with a plurality of feed pipes, the rotating body side is connected with a plurality of discharge pipes, the rotating body lower end is fixed with the rotating frame, the rotating frame both ends are fixed with the vertical frame, the vertical frame is fixedly connected with the spray gun support through locking screw, the spray gun support is fixedly provided with the spray gun, and the spray gun is connected with the discharge pipe.

[0015] Further, the rotating body is provided with a mixing assembly, the mixing assembly comprises a second rotating rod, the second rotating rod is fixed in the rotating body, the second rotating rod is fixed with a gear one at the upper end, the gear one is engaged with a pinion one, the pinion one is engaged with a pinion two, the pinion two is engaged with a gear two, the gear two is fixedly connected with an outer tube, the outer tube rotates between the rotating rod and the fixed body, the outer tube is provided with a plurality of stirring blades, and the fixed body is provided with a dust cover.

[0016] The application has the advantages of:

[0017] The lithium battery diaphragm is unwound by the unwinding mechanism, the lithium battery diaphragm is preheated in the preheating mechanism to improve the surface temperature of the lithium battery diaphragm, improve the uniformity and wettability of coating, the preheated lithium battery diaphragm enters the micro-concave positive coating mechanism through the positive coating traction mechanism, the micro-concave positive coating mechanism coats the front surface of the lithium battery diaphragm, the lithium battery diaphragm after front surface coating enters the air bellow mechanism to perform surface solidification, the lithium battery diaphragm turns over 180 degrees under the action of the guide roller, and the turned over lithium battery diaphragm is sent into the rotary reverse coating mechanism through the reverse coating traction mechanism; the rotary reverse coating mechanism sprays the back surface of the lithium battery diaphragm; the lithium battery diaphragm after back surface spraying enters the air bellow mechanism again to perform surface solidification, and is then pulled into the winding mechanism through the winding traction mechanism and is wound by the winding mechanism; the lithium battery diaphragm is coated on both sides through a continuous production line once, the production cycle is greatly shortened, energy consumption and cost are reduced, the micro-concave positive coating mechanism and the rotary reverse coating mechanism can endow the lithium battery diaphragm with different excellent functions on both sides. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The drawing shows the film of the lithium battery diaphragm double-sided coating;

[0019] Figure 2 The drawing shows the micro-concave positive coating mechanism structure of the application;

[0020] Figure 3 The drawing shows the scraper assembly structure of the application Figure 1 ;

[0021] Figure 4 The drawing shows the scraper assembly structure of the application Figure 2 ;

[0022] Figure 5 For Figure 4 the local enlarged view at A in the middle;

[0023] Figure 6 For the structure of the cleaning assembly of the present application Figure 1 ;

[0024] Figure 7 For the structure of the cleaning assembly of the present application Figure 2 ;

[0025] Figure 8 For the structure of the cleaning assembly of the present application Figure 3 ;

[0026] Figure 9 For the structure of the rotary reverse coating mechanism of the present application Figure 1 ;

[0027] Figure 10 For the structure of the rotary reverse coating mechanism of the present application Figure 2 ;

[0028] Figure 11 For the structure of the rotary reverse coating mechanism of the present application Figure 3 ;

[0029] Figure 12 For Figure 11 the local enlarged view at B in the middle;

[0030] Marked description in the figure:

[0031] Unwinding mechanism 1; preheating mechanism 2; positive coating traction mechanism 3; micro-concave positive coating mechanism 4; bellows mechanism 5; rotary reverse coating mechanism 6; reverse coating traction mechanism 7; winding traction mechanism 8; winding mechanism 9; solution tank 10; motor one 11; anilox roll 12; guide roll 13; center round rod 14; doctor blade 15; circular support 16; push rod one 17; clamping block 18; spring one 19; clamping groove 20; rotating rod 21; support rod 22; air cylinder one 23; support plate 24; support frame 25; air cylinder two 26; push rod two 27; moving block 28; air cylinder three 29; curved support 30; moving plate 31; push rod three 32; shell 33; arc-shaped brush 34; chamber one 35; chamber two 36; water inlet pipe 37; piston 38; spring two 39; support two 40; lead screw support one 41; servo motor one 42; lead screw one 43; lead screw support two 44; rotating wheel 45; lead screw two 46; sliding block 47; motor two 48; rotating wheel two 49; belt two 50; rotating body 51; fixed body 52; feed pipe 53; discharge pipe 54; rotating frame 55; vertical frame 56; spray gun support 57; spray gun 58; dust cover 59; rotating rod two 60; gear one 61; pinion one 62; pinion two 63; gear two 64; outer pipe 65; stirring blade 66. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Example 1

[0035] like Figures 1-12 As shown, a double-sided coating device for lithium battery separators includes an unwinding mechanism 1, which unwinds the lithium battery separator into a preheating mechanism 2 for preheating. The preheated lithium battery separator is then entered into a micro-concave front coating mechanism 4 via a front coating traction mechanism 3 for front coating, and then entered into a rotary back coating mechanism 6 via a back coating traction mechanism 7 for back coating. The double-sided coated lithium battery separator is then pulled into a winding mechanism 9 via a winding traction mechanism 8 and wound up by the winding mechanism 9.

[0036] The preheating mechanism 2 is equipped with a wind box mechanism 5 at its upper end, and the double-coated lithium battery separators are all placed in the wind box mechanism 5 for drying.

[0037] The working principle of the above technical solution is as follows: The lithium battery separator is unwound by the unwinding mechanism 1. The lithium battery separator is preheated in the preheating mechanism 2 to increase the surface temperature of the lithium battery separator and improve the uniformity and wettability of the coating. After preheating, the lithium battery separator enters the micro-concave front coating mechanism 4 through the front coating traction mechanism 3. The micro-concave front coating mechanism 4 coats the front side of the lithium battery separator. After the front side is coated, the lithium battery separator enters the wind box mechanism 5 for surface curing. The lithium battery separator comes out of the wind box mechanism 5 and is flipped 180 degrees under the action of the guide roller. The flipped lithium battery separator is sent into the rotary back coating mechanism 6 through the back coating traction mechanism 7. The rotary back coating mechanism 6 sprays the back side of the lithium battery separator. After the back side is sprayed, the lithium battery separator enters the wind box mechanism 5 again for surface curing. Then it is pulled into the winding mechanism 9 through the winding traction mechanism 8 and wound up by the winding mechanism 9.

[0038] The unwinding mechanism 1 has two unwinding components, and the winding mechanism 9 has two winding components. When the two unwinding components and the two winding components work simultaneously, the two lithium battery separators are unwound by the two unwinding components respectively. After being unwound, the two lithium battery separators are bonded together for film feeding. The micro-concave positive coating mechanism 4 and the rotary reverse coating mechanism 6 coat both sides of the bonded lithium battery separators. At the two winding components, the two lithium battery separators are separated and wound onto the two winding components respectively. When only one unwinding component and one winding component are used, the micro-concave positive coating mechanism 4 and the rotary reverse coating mechanism 6 can coat both sides of the lithium battery separators respectively.

[0039] The lithium battery separator is coated on both sides in one continuous production line from unwinding to rewinding, which greatly shortens the production cycle and reduces energy consumption and cost. Through the micro-concave positive coating mechanism 4 and the rotary reverse coating mechanism 6, the lithium battery separator can be endowed with different excellent functions on both sides.

[0040] Example 2

[0041] like Figures 1-12 As shown, the micro-concave positive coating mechanism 4 includes a solution tank 10, an anilox roller 12 is rotatably connected inside the solution tank 10, a motor 11 is fixed on the side of the solution tank 10, the output end of the motor 11 is connected to the anilox roller 12, and the side of the solution tank 10 is provided with an inlet and an outlet.

[0042] The working principle of the above technical solution is as follows: water-based ceramic slurry is added into the solution tank 10 through the inlet. The water-based ceramic slurry covers the lower end of the anilox roller 12. The lithium battery separator is pressed onto the anilox roller 12 by the guide roller 13. The motor 11 is started to drive the anilox roller 12 to rotate. The anilox roller 12 adheres the water-based ceramic slurry in the solution tank 10 to the surface of the lithium battery separator. The rotation direction of the anilox roller 12 is opposite to the direction of the lithium battery separator, which optimizes the transfer of water-based ceramic slurry and the uniformity of coating.

[0043] Example 3

[0044] like Figures 1-12 As shown, the solution tank 10 is provided with a scraper assembly, which includes a central round rod 14. Three scrapers 15 are fixedly fixed circumferentially on the central round rod 14. Both ends of the central round rod 14 are rotatably connected to a circular bracket 16. The central round rod 14 is slidably connected to a push rod 17. The push rod 17 is fixedly connected to a locking block 18. The locking block 18 is locked in a slot 20 provided on the circular bracket 16. A spring 19 is provided between the locking block 18 and the central round rod 14.

[0045] The lower end of the circular bracket 16 is fixedly connected to the rotating rod 21, the lower end of the rotating rod 21 is rotatably connected to the support rod 22, the support rod 22 is fixed on the side of the solution tank 10, the circular bracket 16 is connected to the output end of the cylinder 23, and the end of the cylinder 23 is rotatably connected to the solution tank 10.

[0046] The working principle of the above technical solution is as follows: the scraper 15 scrapes off the excess water-based ceramic slurry from the anilox roller 12, ensuring that the thickness of the water-based ceramic slurry on the anilox roller 12 is uniform, thereby ensuring the uniformity of coating on the lithium battery separator. The distance between the scraper 15 and the anilox roller 12 is changed by the cylinder 23, thereby changing the thickness of the water-based ceramic slurry on the anilox roller 12.

[0047] The central rod 14 is equipped with three scrapers 15. When a scraper 15 is damaged during operation, the push rod 17 is pressed, and the push rod 17 slides with the end of the central rod 14, causing the locking block 18 to move from the slot 20 on the circular bracket 16. This causes the spring 19 to be compressed. The circular bracket 16 is equipped with three slots 20. Rotating the central rod 14 causes the central rod 14 and the circular bracket 16 to rotate, rotating another scraper 15 to the working position. The locking block 18 is engaged in another slot 20, thus quickly completing the switching of the scraper 15 and reducing downtime.

[0048] When one scraper 15 is in operation, the other two scrapers 15 act as baffles to prevent the water-based ceramic slurry from flowing to the outside of the solution tank 10.

[0049] Example 4

[0050] like Figures 1-12 As shown, a cleaning assembly is provided on the side of the solution tank 10. The cleaning assembly includes a support plate 24, which is fixed to the side of the solution tank 10. A support frame 25 is fixed to the upper end of the support plate 24. A cylinder 26 is fixed on the support plate 24. The output end of the cylinder 26 is fixedly connected to the moving block 28 through a push rod 27. The push rod 27 is slidably connected to the support frame 25.

[0051] A cylinder 29 is fixed on the support plate 24. The output end of the cylinder 29 is rotatably connected to one end of the curved bracket 30. The other end of the curved bracket 30 is slidably connected to the end of the moving plate 31. The middle part of the curved bracket 30 is rotatably connected to the support frame 25. The moving plate 31 is fixedly connected to the outer shell 33 through the push rod 32. The push rod 32 is slidably connected to the moving block 28.

[0052] The outer shell 33 is slidably connected to the arc-shaped brush 34. A first chamber 35 is provided between the outer shell 33 and the arc-shaped brush 34. A second chamber 36 is provided inside the arc-shaped brush 34. The arc-shaped surface of the arc-shaped brush 34 is provided with bristles and micropores. The second chamber 36 is connected to the outside through the micropores. The outer shell 33 is connected to the water inlet pipe 37. A through hole is provided between the first chamber 35 and the second chamber 36. A piston 38 is fixed inside the outer shell 33. The front end of the piston 38 is located inside the second chamber 36. The front end of the piston 38 is sealed at the through hole. A second spring 39 is provided on the outer shell of the piston 38. The two ends of the second spring 39 abut against the outer shell 33 and the arc-shaped brush 34 respectively.

[0053] The working principle of the above technical scheme is as follows: when the micro-concave positive coating mechanism 4 stops working, the surface of the micro-concave positive coating mechanism 4 needs to be cleaned to improve its service life. The cylinder two 26 is started, the moving block 28 is driven to rise by the push rod two 27, the moving plate 31 is driven to rise, the end of the moving plate 31 slides with the end of the bent bracket 30, and the arc-shaped brush 34 is driven to rise to the same height position as the anilox roller 12. The cylinder three 29 is started, the bent bracket 30 is driven to rotate, the moving plate 31 is driven to move towards the anilox roller 12, the outer shell 33 and the arc-shaped brush 34 are driven to move towards the anilox roller 12 by the push rod three 32, the arc-shaped brush 34 contacts the surface of the anilox roller 12, the anilox roller 12 extrudes the arc-shaped brush 34 to shrink into the shell 33, the piston 38 is separated from the through hole, the spring two 39 is compressed, the water in the water inlet pipe 37 enters the chamber one 35, then enters the chamber two 36 through the through hole, and then flows out through the micropores arranged on the arc surface of the arc-shaped brush 34. The motor one 11 is started, the anilox roller 12 is driven to rotate, and the bristles arranged on the arc surface of the arc-shaped brush 34 brush the surface of the anilox roller 12;

[0054] When the surface of the anilox roller 12 is brushed, the arc-shaped brush 34 is separated from the surface of the anilox roller 12, and the piston 38 is driven to re-engage the through hole under the elastic force of the spring two 39, preventing the water from continuing to flow out.

[0055] The water is automatically controlled to flow out, the anilox roller 12 is simple and intelligent, the arc-shaped brush 34 is arc-shaped and closely attached to the outer surface of the anilox roller 12, the cleaning effect and efficiency are improved, the arc-shaped brush 34 is tightly pressed against the outer surface of the anilox roller 12 under the elastic force of the spring two 39, the friction between the two is improved, and the cleaning effect is improved.

[0056] Example five

[0057] As shown in Figures 1-12 The rotating reverse coating mechanism 6 includes a bracket two 40, a screw rod bracket one 41 fixed on the bracket two 40, a servo motor one 42 fixed at the end of the screw rod bracket one 41, a screw rod one 43 connected with the output end of the servo motor one 42, the screw rod one 43 rotating in the screw rod bracket one 41, the screw rod one 43 threadedly connected with the end of a screw rod bracket two 44, the end of the screw rod bracket two 44 sliding in the screw rod bracket one 41, a screw rod two 46 rotatingly connected in the screw rod bracket two 44, a rotating wheel 45 fixed at the end of the screw rod two 46, the rotating wheel 45 connected with the output end of a servo motor two through a belt, the servo motor two fixed on the side surface of the screw rod bracket two 44, the screw rod two 46 threadedly connected with a sliding block 47, the sliding block 47 sliding in the screw rod bracket two 44, and the sliding block 47 fixedly connected with a motor two 48.

[0058] The output end of the motor 48 is connected to the rotating wheel 49. The rotating wheel 49 is connected to the rotating body 51 via the belt 50. The rotating body 51 rotates at the lower end of the fixed body 52. ​​The fixed body 52 is fixed to the side of the slider 47. Several feed pipes 53 are connected to the side of the fixed body 52. ​​Several discharge pipes 54 are connected to the side of the rotating body 51. A rotating frame 55 is fixed at the lower end of the rotating body 51. Vertical frames 56 are fixed at both ends of the rotating frame 55. The vertical frames 56 are fixed to the spray gun bracket 57 by locking screws. A spray gun 58 is fixed inside the spray gun bracket 57. The spray gun 58 is connected to the discharge pipe 54.

[0059] The working principle of the above technical solution is as follows: Servo motor 1 42 is started, which drives lead screw 1 43 to rotate, which drives lead screw support 2 44 to move longitudinally, and then drives spray gun 58 to move longitudinally. Servo motor 2 is started, which drives wheel 45 to rotate via belt, which drives lead screw 2 46 to rotate, which drives slider 47 to move laterally, and then drives spray gun 58 to move laterally. By using servo motor 1 42 and servo motor 2 in combination, spray gun 58 can be moved flexibly on lithium battery separator, realizing the flexibility of spraying.

[0060] The motor 48 is started, which drives the rotating wheel 49 to rotate. The belt 50 drives the rotating body 51 to rotate at the lower end of the fixed body 52, which drives the rotating frame 55 to rotate with the rotating body 51, drives the two vertical frames 56 to rotate, and drives the two spray guns 58 to rotate. Water-based PVDF slurry is injected into the fixed body 52 through the feed pipe 53. The water-based PVDF slurry moves down into the rotating body 51 and is then sprayed out through the discharge pipe 54 and the spray guns 58, thus realizing the rotary spraying of the lithium battery separator surface.

[0061] The vertical bracket 56 can rotate between the spray gun bracket 57 and the spray gun 58, thereby adjusting the spray angle of the spray gun 58.

[0062] Example 6

[0063] like Figures 1-12 As shown, the rotating body 51 is equipped with a mixing component, which includes a second rotating rod 60. The lower end of the second rotating rod 60 is fixed inside the rotating body 51, and a first gear 61 is fixed to the upper end of the second rotating rod 60. The first gear 61 meshes with a first pinion 62, the first pinion 62 meshes with a second pinion 63, the second pinion 63 meshes with a second gear 64, and the second gear 64 is fixedly connected to an outer tube 65. The outer tube 65 rotates between the second rotating rod 60 and the fixed body 52. ​​The outer tube 65 is equipped with multiple stirring blades 66, and the fixed body 52 is equipped with a dust cover 59.

[0064] The working principle of the above technical solution is as follows: when the rotating body 51 rotates clockwise, the rotating rod 60 rotates clockwise, the gear 61 rotates clockwise, the pinion 62 rotates counterclockwise, the pinion 63 rotates clockwise, the gear 64 rotates counterclockwise, the outer tube 65 rotates counterclockwise, and the plurality of stirring blades 66 rotate counterclockwise with the outer tube 65. When different types of slurry are injected through the plurality of feeding tubes 53, the plurality of stirring blades 66 rotate to rapidly mix the various slurry, thereby improving the quality of spraying. The rotating direction of the plurality of stirring blades 66 is opposite to the rotating direction of the rotating body 51, thereby improving the mixing speed.

[0065] It can be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, the features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A double-sided coating device for lithium battery separators, characterized in that, The system includes an unwinding mechanism (1), which unwinds the lithium battery separator into a preheating mechanism (2) for preheating. The preheated lithium battery separator is then passed through a forward coating traction mechanism (3) into a micro-concave forward coating mechanism (4) for front-side coating. It is then passed through a reverse coating traction mechanism (7) into a rotary reverse coating mechanism (6) for reverse-side spraying. The double-sided coated lithium battery separator is then pulled into a winding mechanism (9) by a winding traction mechanism (8) and wound up by the winding mechanism (9). The micro-recessed coating mechanism (4) includes a solution tank (10), and an anilox roller (12) is rotatably connected inside the solution tank (10). The solution tank (10) is provided with a scraper assembly, which includes a central round rod (14) and three scrapers (15) are fixed equidistantly on the circumference of the central round rod (14). The solution tank (10) is provided with a cleaning component on its side. The cleaning component includes a support plate (24). The support plate (24) is fixed on the side of the solution tank (10). A support frame (25) is fixed on the upper end of the support plate (24). A cylinder (26) is fixed on the support plate (24). The output end of the cylinder (26) is fixedly connected to the moving block (28) through a push rod (27). The push rod (27) is slidably connected to the support frame (25). A cylinder three (29) is fixed on the support plate (24). The output end of the cylinder three (29) is rotatably connected to one end of the curved bracket (30). The other end of the curved bracket (30) is slidably connected to the end of the moving plate (31). The middle part of the curved bracket (30) is rotatably connected to the support frame (25). The moving plate (31) is fixedly connected to the outer shell (33) through the push rod three (32). The push rod three (32) is slidably connected to the moving block (28). The outer shell (33) is slidably connected to the arc-shaped brush (34). A first chamber (35) is provided between the outer shell (33) and the arc-shaped brush (34). A second chamber (36) is provided inside the arc-shaped brush (34). The arc-shaped brush (34) has bristles and micropores. The second chamber (36) is connected to the outside through the micropores. The outer shell (33) is connected to the water inlet pipe (37). A through hole is provided between the first chamber (35) and the second chamber (36). A piston (38) is fixed inside the outer shell (33). The front end of the piston (38) is located inside the second chamber (36). The front end of the piston (38) is sealed at the through hole. A second spring (39) is provided on the outer sleeve of the piston (38). The two ends of the second spring (39) abut against the outer shell (33) and the arc-shaped brush (34) respectively.

2. The lithium battery separator double-sided coating device according to claim 1, characterized in that, The preheating mechanism (2) is equipped with a bellows mechanism (5) at its upper end, and the double-coated lithium battery separators are all placed inside the bellows mechanism (5) for drying.

3. The lithium battery separator double-sided coating device according to claim 1, characterized in that, The solution tank (10) is fixed with a motor (11) on the side. The output end of the motor (11) is connected to the anilox roller (12). The solution tank (10) is provided with an inlet and an outlet on the side.

4. The lithium battery separator double-sided coating device according to claim 3, characterized in that, Both ends of the central round rod (14) are rotatably connected to the circular bracket (16). The central round rod (14) is slidably connected to the push rod (17). The push rod (17) is fixedly connected to the locking block (18). The locking block (18) is locked in the locking groove (20) provided on the circular bracket (16). A spring (19) is provided between the locking block (18) and the central round rod (14).

5. The lithium battery separator double-sided coating device according to claim 4, characterized in that, The lower end of the circular bracket (16) is fixedly connected to the rotating rod (21), the lower end of the rotating rod (21) is rotatably connected to the support rod (22), the support rod (22) is fixed on the side of the solution tank (10), the circular bracket (16) is connected to the output end of the cylinder (23), and the end of the cylinder (23) is rotatably connected to the solution tank (10).

6. The lithium battery separator double-sided coating device according to claim 1, characterized in that, The rotary reverse coating mechanism (6) includes a second bracket (40), a first lead screw bracket (41) is fixed on the second bracket (40), a first servo motor (42) is fixed at the end of the first lead screw bracket (41), the output end of the first servo motor (42) is connected to the first lead screw (43), the first lead screw (43) rotates in the first lead screw bracket (41), the first lead screw (43) is threadedly connected to the end of the second lead screw bracket (44), the end of the second lead screw bracket (44) slides in the first lead screw bracket (41), the second lead screw (46) is rotatably connected in the second lead screw bracket (44), the end of the second lead screw (46) is fixed with a wheel (45), the wheel (45) is connected to the output end of the second servo motor through a belt, the second servo motor is fixed on the side of the second lead screw bracket (44), the second lead screw (46) is threadedly connected to a slider (47), the slider (47) slides in the second lead screw bracket (44), and the slider (47) is fixedly connected to the second motor (48).

7. The lithium battery separator double-sided coating device according to claim 6, characterized in that, The output end of the motor (48) is connected to the rotating wheel (49), which is connected to the rotating body (51) via the belt (50). The rotating body (51) rotates at the lower end of the fixed body (52). The fixed body (52) is fixed to the side of the slider (47). Several feed pipes (53) are connected to the side of the fixed body (52). Several discharge pipes (54) are connected to the side of the rotating body (51). A rotating frame (55) is fixed at the lower end of the rotating body (51). Vertical frames (56) are fixed at both ends of the rotating frame (55). The vertical frames (56) are fixed to the spray gun bracket (57) via locking screws. A spray gun (58) is fixed inside the spray gun bracket (57). The spray gun (58) is connected to the discharge pipe (54).

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