A lithium battery separator coating device

Abstract

The application discloses a lithium battery diaphragm coating device and relates to the lithium battery diaphragm production field.The lithium battery diaphragm coating device comprises a coating box, a limiting frame on the top of the coating box, a power device at one end in the coating box, a coating device on the top of the limiting frame, and a material receiving and releasing device at the other end of the coating box.The power device comprises a driving wheel at one end in the coating box, a driving part on one side outside the coating box, and an anti-wrinkle part close to the driving wheel at the bottom end in the coating box.The coating device comprises an extrusion part at one end on the top of the limiting frame and a roller part on one side of the extrusion part.The material receiving and releasing device comprises a feeding part in the center of the coating box, a scratch-proof wheel at one end of the rotating limiting frame, and a discharging part at one end of the coating box away from the coating device.The lithium battery diaphragm coating device can prevent the diaphragm from wrinkling and uniformly coat.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of lithium battery separator production, in particular to a lithium battery separator coating device. BACKGROUND

[0002] Lithium battery separator coating is important in the manufacturing process of lithium batteries: it can prevent short circuits between positive and negative materials, thereby improving the safety performance of the battery, it can slow down the dissolution of lithium ions between the positive and negative electrodes, thereby prolonging the cycle life of the battery, it can reduce the thickness of the positive and negative electrodes, reduce the volume of the battery, it can improve the conductivity of the positive and negative electrodes, thereby improving the capacity of the battery, it can reduce the diffusion rate of lithium ions between the positive and negative electrodes, thereby reducing the self-discharge rate of the battery, it can reduce the resistance of the positive and negative electrodes, thereby improving the voltage of the battery; based on this, regular lithium battery production will use coating technology, but the existing device is prone to separator wrinkles and uneven coating problems, so a lithium battery separator coating device that can coat more evenly is needed.

[0003] According to the application number 202010670329.4, a kind of separator coating device and its coating method are provided, by the line bar on the line bar with the tendency of moving in the opposite direction of coating direction, two ends are provided with the line of the line bar and produce the pressure of pressing, can avoid the situation that separator coating process occurs wrinkle, improve coating uniformity, improve coating quality.

[0004] The above patent document solves the problem of separator wrinkles during the coating process, but cannot guarantee that the coating material on the separator is more uniform. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a lithium battery separator coating device to solve the technical problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A kind of lithium battery separator coating device, including coating box, limit frame is arranged at the top of the coating box, its characterized in that, power device is arranged at one end in the coating box, coating device is arranged at the top of the limit frame, receiving and releasing device is arranged at the other end of the coating box;

[0008] The power device includes a drive wheel arranged at one end in the coating box, a drive component arranged on one side outside the coating box, and a wrinkle prevention component arranged at the bottom end of the coating box close to the drive wheel;

[0009] The coating device includes an extrusion component arranged at one end of the top of the limit frame, and a roller component arranged on one side of the extrusion component;

[0010] The feeding and discharging device comprises a feeding component arranged in the central part of the coating box, a scratch-proof wheel arranged at one end of the limiting frame, and a discharging component arranged at the end of the coating box away from the coating device.

[0011] Preferably, the wrinkle-preventing component comprises two first telescopic rods arranged at the bottom end of the coating box, first bearings arranged at the execution ends of the first telescopic rods, a first rotating roller rotatably arranged in the middle part of the two first bearings, and a pressure sensor arranged at the top of the coating box. In this preferred embodiment, the height of the rotating roller is adjusted by the first telescopic rods, so as to change the winding length of the diaphragm on the driving wheel, and thus to adjust the tightness of the diaphragm to a certain extent.

[0012] Preferably, the extruding component comprises a leakage groove arranged at the top of the limiting frame, a bracket sleeved on the top of the leakage groove, a plurality of second telescopic rods arranged at the bottom of the bracket, and a piston plate arranged at the execution ends of the second telescopic rods and movably arranged on the top of the leakage groove. The leakage groove comprises a feeding groove arranged at the side, a plurality of check valves arranged in the feeding groove, and a discharging groove arranged at the bottom of the leakage groove. A plurality of fine holes are uniformly arranged on the discharging groove. In this preferred embodiment, the piston plate is driven by the second telescopic rods to reciprocate in the leakage groove, so as to suck the external active material into the leakage groove and extrude the active material on the diaphragm.

[0013] Preferably, the roller pressing component comprises lifting grooves arranged at the two sides of the limiting frame, a worm and gear lifter arranged at the top of the lifting grooves, second bearings arranged in the lifting grooves and fixed at the execution ends of the worm and gear lifter, and pressing rollers rotatably arranged in the two second bearings. In this preferred embodiment, the height of the pressing rollers is adjusted by the worm and gear lifter, so that the active material can be uniformly pressed on the diaphragm.

[0014] Preferably, the feeding component comprises two drawer grooves arranged in the central part of the coating box, a drawer plate movably arranged on the drawer grooves, and a winding-off wheel arranged at the central part of the drawer plate. In this preferred embodiment, the drawer plate structure can facilitate replacement of a new diaphragm roll.

[0015] Preferably, the discharging component comprises a sleeve wheel assembly rotatably arranged at one end of the coating box, a second motor arranged at one side of the outside of the coating box, a second speed reducer connected at the execution end of the second motor through a connecting shaft, and a detachable plate arranged at the other side of the coating box. In this preferred embodiment, the second motor and the second speed reducer provide rotating force during winding.

[0016] Preferably, the sleeve wheel assembly comprises a cross-shaped rotating shaft, and a sleeve sleeved on the outside of the cross-shaped rotating shaft. The output end of the second speed reducer is connected with one end of the cross-shaped rotating shaft through a connecting shaft. In this preferred embodiment, the sleeve can facilitate removal of the coated roll wound on the cross-shaped rotating shaft, so as to facilitate discharging.

[0017] Preferably, the detachable plate is provided with a third bearing in the middle, and spring expansion plates are arranged at both ends, and the other end of the cross shaft is rotatably arranged in the third bearing. In the preferred embodiment, the detachable plate is detachable through the spring expansion plate, facilitating the extraction of the sleeve.

[0018] Preferably, the driving part comprises a first motor arranged on one side of the coating box, a first speed reducer connected to the execution end of the first motor through a shaft coupling, and the output end of the first speed reducer is connected to the driving wheel through a shaft coupling. In the preferred embodiment, the driving part is connected to the driving wheel through the shaft coupling.

[0019] Preferably, the limiting frame and the position where the coating box is installed are provided with two limiting grooves. In the preferred embodiment, the limiting grooves prevent the diaphragm from deviating from the position.

[0020] In summary, the present application mainly has the following advantages:

[0021] In the embodiment, the fine holes are uniformly arranged on the discharge chute to extrude the active material to form fine lines, so that the active material can be conveniently and uniformly pressed on the diaphragm by the compression roller. By adjusting the reciprocating motion degree of the telescopic rod, the area of each coating can be adjusted.

[0022] Through the monitoring of the pressure sensor, the telescopic rod drives the adjusting roller to adjust the driving length of the diaphragm on the driving wheel, which can to some extent adjust the wrinkles or relaxation caused by the driving fluctuation or slipping of the diaphragm before and after the driving, and prevent the diaphragm surface from being uneven during the coating process, so as to facilitate uniform coating.

[0023] Through the detachable design of the material collecting and releasing device, the new diaphragm can be conveniently replaced, and the coated diaphragm roll can be taken off. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall axonometric view of the present application;

[0025] Figure 2 It is the enlarged view of the partial area of the present application;

[0026] Figure 3 It is the overall device side view of the present application;

[0027] Figure 4 It is the axonometric view of the anti-wrinkle part of the present application;

[0028] Figure 5 It is the axonometric view of the feeding part of the present application;

[0029] Figure 6 It is the disassembly view of the sleeve wheel assembly of the present application;

[0030] Figure 7Fig. 1 is a schematic view of the detachable board of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS: 10, coating box; 11, limiting frame; 20, power device; 30, coating device; 40, material receiving and releasing device; 21, driving wheel; 22, driving part; 23, anti-wrinkle part; 31, extruding part; 32, roller pressing part; 41, feeding part; 42, anti-scratching wheel; 43, discharging part; 231, first telescopic rod; 232, first bearing; 233, first rotating roller; 234, pressure sensor; 311, leakage groove; 312, support; 313, second telescopic rod; 314, piston plate; 3111, feeding groove; 3112, check valve; 3113, discharging groove; 3114, fine hole; 321, lifting groove; 322, worm and gear lifter; 323, second bearing; 324, pressing roller; 411, drawer groove; 412, drawer plate; 413, unwinding wheel; 431, sleeve wheel assembly; 432, second motor; 433, second speed reducer; 434, detachable board; 4311, cross rotating shaft; 4312, sleeve; 4341, third bearing; 4342, spring telescopic plate; 221, first motor; 222, first speed reducer; 111, limiting groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0033] The embodiments of the present application will be described below according to the overall structure of the present application. EMBODIMENT

[0034] Please refer to the drawings in the embodiments of the present application Figure 1 , 3The application discloses a lithium battery diaphragm coating device, as shown in the accompanying drawings 1-4, which comprises a coating box 10, a limiting frame 11 arranged at the top of the coating box 10, a power device 20 arranged at one end inside the coating box 10, a coating device 30 arranged at the top of the limiting frame 11, and a material receiving and releasing device 40 arranged at the other end of the coating box 10.

[0035] It should be noted that, during the coating process, the movement of the diaphragm may cause partial area to be wrinkled or tightened due to the driving speed or slipping on the roller, and if this happens during the coating process, the coating effect will be poor. Therefore, a pressure sensor 234 is arranged below the coated diaphragm, if the pressure sensed by the pressure sensor 234 is too large, the diaphragm is too tight, if the pressure sensed by the pressure sensor 234 is too small, the diaphragm is too loose, the first telescopic rod 231 is controlled to rise and fall by the sensing signal of the pressure sensor 234 through the PLC element, and the end of the coating box 10 close to the driving wheel 21 is not provided with a box plate, so as to facilitate manual wiring after the winding is replaced, and after the wiring and debugging of the diaphragm are completed, the automatic coating can be performed.

[0036] Further, the first motor 221 is started to drive the driving wheel 21 to rotate through the first speed reducer 222, and the driving wheel 21 drives the diaphragm to advance and uniformly heat the diaphragm.

[0037] Further, the pressure sensor 234 arranged at the top of the coating box 10 detects the pressure of the diaphragm reaching the bottom of the coating device 30 in real time, when the pressure is too low, the PLC element controls the first telescopic rod 231 to rise, drives the first bearing 232 and the first roller 233 to move upwards, increases the contact length of the diaphragm with the driving wheel 21, and slightly tightens the diaphragm.

[0038] Further, when the pressure is too high, the PLC element controls the first telescopic rod 231 to descend, drives the first bearing 232 and the first roller 233 to move downwards, reduces the contact length of the diaphragm with the driving wheel 21, and slightly loosens the diaphragm.

[0039] Please refer to the accompanying drawings Figure 1 、 2,3, the coating device 30 includes an extrusion component 31 arranged at one end of the top of the limiting frame 11, and a roller component 32 arranged at one side of the extrusion component 31; two limiting grooves 111 are arranged at the position where the limiting frame 11 is installed with the coating box 10; the extrusion component 31 includes a leakage groove 311 arranged at the top of the limiting frame 11, a bracket 312 sleeved at the top of the leakage groove 311, a plurality of second telescopic rods 313 arranged at the bottom of the bracket 312, a piston plate 314 arranged at the execution end of the second telescopic rods 313 and movably arranged at the top of the leakage groove 311, the leakage groove 311 includes a feeding groove 3111 at the side, a plurality of check valves 3112 arranged inside the feeding groove 3111, and a discharging groove 3113 arranged at the bottom of the leakage groove 311, a plurality of fine holes 3114 uniformly arranged on the discharging groove 3113; the roller component 32 includes a lifting groove 321 arranged at both sides of the limiting frame 11, a worm and gear lifter 322 arranged at the top of the lifting groove 321, a second bearing 323 fixed at the execution end of the worm and gear lifter 322 and arranged in the lifting groove 321, and a pressure roller 324 rotatably arranged in the two second bearings 323.

[0040] It should be noted that when the active material is extruded from the fine holes 3114 to the advancing diaphragm, a plurality of material lines are formed, which facilitates the pressure roller 324 to uniformly press the active material on the diaphragm; the height of the limiting groove 111 is slightly greater than the thickness of the diaphragm, and the distance between the two limiting grooves 111 is the same as the width of the diaphragm, which can prevent the diaphragm from deviating and fluctuating; the two worm and gear lifters 322 have a connecting rod connected between the adjustment knobs, which can adjust the height of the pressure roller 324 synchronously on both sides;

[0041] Further, before formal coating, a trial run needs to be performed, the height of the second bearing 323 in the lifting groove 321 is adjusted by the worm and gear lifter 322, so as to adjust the pressing height of the pressure roller 324, until the extruded active material coating is uniform and delicate;

[0042] Further, when the diaphragm is driven out by the driving wheel 21, the two sides of the diaphragm move outward from the limiting grooves 111, the second telescopic rods 313 at the bottom of the bracket 312 perform telescopic movement at a set time, and drive the piston plate 314 to perform piston movement at the top of the leakage groove 311;

[0043] Further, when the piston plate 314 is pulled out upward, the check valves 3112 are opened under the action of the pressure difference, and a certain amount of active material is sucked through the feeding groove 3111;

[0044] Further, when the piston plate 314 is extruded downward, the check valves 3112 are closed, and the active material is extruded from the fine holes 3114 on the discharging groove 3113 to the moving diaphragm, and is uniformly rolled on the diaphragm by the pressure roller 324.

[0045] Please refer to the accompanying drawings Figure 1 、 5, 6, 7, the pay-off device 40 includes a central feed member 41 provided inside the coating box 10, a scratch-proof wheel 42 rotatably provided at one end of the limiting frame 11, and a discharge member 43 provided at one end of the coating box 10 away from the coating device 30; the feed member 41 includes two drawer grooves 411 provided at the central part inside the coating box 10, a drawer plate 412 movably arranged on the drawer grooves 411, and a pay-off wheel 413 provided at the central part of the drawer plate 412; the discharge member 43 includes a sleeve wheel assembly 431 rotatably provided at one end of the coating box 10, a second motor 432 provided at one side outside the coating box 10, a second speed reducer 433 connected to the output end of the second motor 432 through a connecting shaft, and a detachable plate 434 provided at the other side of the coating box 10; the sleeve wheel assembly 431 includes a cross shaft 4311 and a sleeve 4312 sleeved outside the cross shaft 4311, and the output end of the second speed reducer 433 is connected to one end of the cross shaft 4311 through a connecting shaft; the detachable plate 434 is provided with a third bearing 4341 at the middle part and spring expansion plates 4342 at both ends, and the other end of the cross shaft 4311 is rotatably arranged in the third bearing 4341.

[0046] It should be noted that the scratch-proof wheel 42 is rotatably arranged at the position of the diaphragm away from the limiting frame 11, which serves to adjust the wire laying angle and prevent scratching, the front and rear baffles of the drawer plate 412 are provided with upward inclined grooves for facilitating disassembly, the spring expansion plates 4342 are arranged on the side wall of the coating box 10, and the detachable plate 434 is provided with grooves at both ends and can be detachably arranged on the side wall of the coating box 10.

[0047] Further, when the diaphragm needs to be replaced, the drawer plate 412 is pulled out of the drawer groove 411, and the pay-off wheel 413 is replaced.

[0048] Further, during normal coating, the second motor 432 is started to drive the sleeve wheel assembly 431 to rotate and wind the coated diaphragm.

[0049] Further, when the sleeve wheel assembly 431 completes one winding, the detachable plate 434 is detached from the coating box 10 by adjusting the spring expansion plates 4342, and the third bearing 4341 is pulled out of the cross shaft 4311.

[0050] Further, the discharge can be performed by pulling the sleeve 4312 out of the cross shaft 4311.

[0051] The working principle of the present application is as follows:

[0052] The electrical components in the present application are triggered to work by the PLC controller, and the model of the PLC controller is "FX3U-16MR".

[0053] First, the drawer plate 412 is pulled out from the drawer slot 411, the roll changing wheel 413 is replaced, the first motor 221 is started, the driving wheel 21 is rotated through the first speed reducer 222, the diaphragm is advanced and uniformly heated by the driving wheel 21, the pressure sensor 234 at the top of the coating box 10 detects the diaphragm pressure reaching the bottom of the coating device 30 in real time, when the pressure is too low, the PLC element controls the first telescopic rod 231 to rise, drives the first bearing 232 and the first rotating roller 233 to move upward, increases the contact length of the diaphragm with the driving wheel 21, and slightly tightens the diaphragm, when the pressure is too high, the PLC element controls the first telescopic rod 231 to descend, drives the first bearing 232 and the first rotating roller 233 to move downward, reduces the contact length of the diaphragm with the driving wheel 21, and slightly loosens the diaphragm, then before coating, a trial run is performed, the height of the second bearing 323 in the lifting groove 321 is adjusted through the worm and gear lifter 322, so that the pressing height of the pressure roller 324 is adjusted, until the active material coating pressed out is uniform and delicate, when the diaphragm is driven out by the driving wheel 21, its two sides move outward from the limiting slot 111, the second telescopic rod 313 at the bottom of the support 312 performs telescopic movement at a set time, drives the piston plate 314 to perform piston movement at the top in the leakage groove 311, when the piston plate 314 is pulled out upward, the check valve 3112 is opened under the action of the pressure difference, a certain amount of active material is sucked in through the feeding groove 3111, when the piston plate 314 is extruded downward, the check valve 3112 is closed, the active material is extruded from the fine hole 3114 on the discharge groove 3113 to the moving diaphragm, and is uniformly rolled on the diaphragm through the pressure roller 324, at the same time, the second motor 432 is started, the sleeve wheel assembly 431 is rotated to wind the coated diaphragm through the second speed reducer 433, when the sleeve wheel assembly 431 completes winding once, the detachable plate 434 is detached from the coating box 10 through the adjustment of the spring telescopic plate 4342, at the same time, the third bearing 4341 is pulled out from the cross shaft 4311, and the discharging can be performed by pulling out the sleeve 4312 from the cross shaft 4311.

[0054] Although the embodiments of the present application have been shown and described, the specific embodiments are merely illustrative of the present application, and are not intended to limit the present application, and the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A lithium battery diaphragm coating device, comprising a coating box (10), a limiting frame (11) arranged on the top of the coating box (10), characterized in that: A power device (20) is provided at one end of the coating box (10), a coating device (30) is provided on the top of the limiting frame (11), and a material receiving and releasing device (40) is provided at the other end of the coating box (10); The power device (20) includes a driving wheel (21) provided at one end inside the coating box (10), a driving component (22) provided at one side outside the coating box (10), and an anti-wrinkle component (23) provided at the bottom end inside the coating box (10) near the driving wheel (21); The coating device (30) comprises an extrusion component (31) provided at one end of the top of the limiting frame (11), and a rolling component (32) provided at one side of the extrusion component (31); The material receiving and unloading device (40) includes a feeding component (41) located in the center of the coating box (10), an anti-scratching wheel (42) rotatably located at one end of the limiting frame (11), and a discharging component (43) located at the end of the coating box (10) away from the coating device (30). The anti-wrinkle component (23) includes two first telescopic rods (231) located at the bottom end of the coating box (10), a first bearing (232) located at the execution end of the first telescopic rod (231), a first roller (233) rotatably installed in the middle of the two first bearings (232), and a pressure sensor (234) located at the top of the coating box (10). The extruding component (31) includes a leakage groove (311) located at the top of the limiting frame (11), a bracket (312) sleeved on the top of the leakage groove (311), and a number of rollers located at the bottom of the bracket (312). a second telescopic rod (313), a piston plate (314) provided at the execution end of the second telescopic rod (313) and movable on the top of the leakage groove (311), the leakage groove (311) including a side feed groove (3111), a plurality of check valves (3112) provided inside the feed groove (3111), a discharge groove (3113) provided at the bottom of the leakage groove (311), the discharge groove (3113) being provided with a plurality of fine holes (3114) evenly arranged, the rolling component (32) including a lifting groove (321) provided on both sides of the limiting frame (11), a worm gear lifter (322) provided at the top of the lifting groove (321), a second bearing (323) provided in the lifting groove (321) and fixed at the execution end of the worm gear lifter (322), and a pressure roller (324) rotating in the two second bearings (323).

2. A lithium battery diaphragm coating device according to claim 1, characterized in that: The feeding component (41) includes two drawer grooves (411) located in the center of the coating box (10), a drawer plate (412) movable on the drawer grooves (411), and an unwinding wheel (413) located in the center of the drawer plate (412).

3. A lithium battery diaphragm coating device according to claim 1, characterized in that: The discharging component (43) includes a pulley assembly (431) rotatably arranged at one end of the coating box (10), a second motor (432) arranged on one side outside the coating box (10), a second reducer (433) connected to the execution end of the second motor (432) through a coupling, and a removable plate (434) arranged on the other side of the coating box (10).

4. A lithium battery diaphragm coating device according to claim 3, characterized in that: The wheel assembly (431) comprises a cross shaft (4311), a sleeve (4312) sleeved outside the cross shaft (4311), and an output end of the second reducer (433) is connected to one end of the cross shaft (4311) via a coupling.

5. A lithium battery diaphragm coating device according to claim 4, characterized in that: A third bearing (4341) is provided in the middle of the removable plate (434), and spring telescopic plates (4342) are provided at both ends. The other end of the cross shaft (4311) is rotatably disposed in the third bearing (4341).

6. The lithium battery diaphragm coating device according to claim 1, characterized in that: The driving component (22) includes a first motor (221) provided on an outer side of the coating box (10), a first reducer (222) connected to an execution end of the first motor (221) via a coupling, and an output end of the first reducer (222) is connected to the driving wheel (21) via a coupling.

7. The lithium battery diaphragm coating device according to claim 1, characterized in that: Two limiting grooves (111) are provided at the locations where the limiting frame (11) and the coating box (10) are installed.

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