A rotary spraying device for coating the surface of a lithium battery separator

Abstract

The application relates to the field of lithium battery diaphragm preparation, in particular to a rotary spraying device for coating the surface of a lithium battery diaphragm; the device comprises an introduction mechanism, a rotary spraying mechanism and an exit mechanism which are sequentially arranged on a rack; the lithium battery diaphragm to be coated is introduced to the rotary spraying mechanism through the introduction mechanism for spraying, and is then introduced out through the exit mechanism; the coating is more evenly covered on the surface of the lithium battery diaphragm through the rotary spraying mechanism; the rotary spraying mechanism comprises a deironing spraying box, a deironing device for deironing the spraying is arranged in the deironing spraying box, and a rotary sprayer is communicated and fixed to the lower end of the deironing spraying box and used for uniformly spraying the lithium battery diaphragm; the application has the beneficial effect of solving the problem that the rotary spraying has dead angles and the spraying is uneven during the spraying process of the lithium battery diaphragm.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lithium battery separator preparation, more particularly to a rotary spraying device for surface coating of lithium battery separator. BACKGROUND

[0002] As the core power source in today's new energy field, the safety, energy density and cycle life of lithium battery put forward strict requirements on the performance of the separator. 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 lithium battery separator often has dead angles during the spraying process, and the spraying is not uniform. For example, a rotary spraying machine with patent number CN201621208274.0, which includes a motor, a drive wheel, a rotary table support frame, a rotary table, and a rotary joint. The output shaft of the motor is connected to the drive wheel, which is connected to the driven wheel through a belt. The top surface of the driven wheel is fixed to the upper flange of the rotary joint. The bottom of the driven wheel is connected to the middle of the rotary table through a bearing. The rotary table is supported by the rotary table support frame. A plurality of upper spraying pipes are connected to the top of the rotary joint, and a plurality of lower spraying pipes are connected to the bottom of the rotary joint. A plurality of nozzles are uniformly spaced on the top surface of the upper spraying pipe and the bottom surface of the lower spraying pipe. A plurality of fluid pipes are connected to the side wall of the rotary joint. The spraying process completed by the rotary spraying machine has a uniform thickness of the sprayed film on the spraying surface, and is particularly suitable for forming a circular surface of the sprayed film. However, the device cannot uniformly spray the lithium battery separator in the same amount during the spraying process. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to overcome the problem of the existing technology that the lithium battery separator often has dead angles during the spraying process and the spraying is not uniform.

[0004] To this end, the technical solution adopted is that the present application provides a rotary spraying device for surface coating of lithium battery separator, which comprises a rack, an introduction mechanism, a rotary spraying mechanism and an outlet mechanism arranged in sequence on the rack. The lithium battery separator to be coated is introduced to the rotary spraying mechanism by the introduction mechanism for spraying, and then introduced out by the outlet mechanism. The rotary spraying mechanism makes the coating more uniformly cover the surface of the lithium battery separator. The rotary spraying mechanism comprises a deironing spraying box, and a deironing device is arranged in the deironing spraying box to deiron the spraying. The lower end of the deironing spraying box is connected to and fixed with a rotary sprayer for uniformly spraying the lithium battery separator.

[0005] Preferably, the deironing spraying box comprises a material receiving cover arranged at the side end, the lower end of the deironing spraying box is connected to the rotary sprayer through a plurality of falling pipes, the side end of the deironing spraying box is provided with a connecting pipe, a central filter frame is fixed in the deironing spraying box, and the deironing device is inserted and connected to the central filter frame.

[0006] Preferably, the center of the center filter frame is provided with a lead-in jack, the lead-in jack is inserted into the lead-in pipe to communicate with the inside of the center filter frame, and the two ends of the center filter frame are provided with a plurality of filter holes.

[0007] Preferably, the iron removal device comprises an upper cover plate, the upper cover plate is arranged at the upper end of the iron removal spraying box, the lower end of the upper cover plate is symmetrically fixed with two connecting seats, a plurality of magnetic medium rods are arranged between the two connecting seats, a plurality of medium steel plates are fixed on the magnetic medium rods, a permanent magnet storage frame is fixed at the center of the magnetic medium rods, and the permanent magnet storage frame is provided with a permanent magnet.

[0008] Preferably, the permanent magnet is arranged in the clamping frame, the clamping frame is made of non-magnetic material, a magnetic lifting screw rod is rotatably arranged on the clamping frame, and the magnetic lifting screw rod is connected to the upper cover plate through thread cooperation.

[0009] Preferably, the rotary sprayer comprises a collecting box, a plurality of connecting pipes are fixedly connected to the collecting box and communicate with each other, and the connecting pipes correspond to the falling pipes; a concentrated thin box is fixedly connected to the lower end of the dispersion pipeline, the collecting box is connected to the concentrated thin box through the dispersion pipeline, a central concentration frame is arranged in the collecting box for collecting the falling paint, and the lower end of the central concentration frame is fixedly connected to the dispersion pipeline.

[0010] Preferably, the inside of the central concentration frame is provided with a slope.

[0011] Preferably, the side end of the collecting box is fixedly connected with a linkage driver through a motor base, the linkage driver rotates through a screw shaft, the screw shaft is connected to a lifting connecting plate through thread cooperation, a plurality of sealing pressure seats are uniformly fixed on the lifting connecting plate, the plurality of sealing pressure seats are sealingly inserted into the concentrated thin box for longitudinal displacement, a gear is fixed on the screw shaft, and the gear meshes with a rotary connector.

[0012] Preferably, the rotary connector comprises a combined tooth plate, the gear on the screw shaft meshes with the combined tooth plate through transmission, the combined tooth plate meshes with a plurality of rotary arc-shaped cylinders through the gear and the rack, and the plurality of rotary arc-shaped cylinders are uniformly arranged at the lower end of the concentrated thin box.

[0013] Preferably, the sealing pressure seat is sealingly inserted into the rotary arc-shaped cylinder, the lower end of the rotary arc-shaped cylinder is connected to a dispersion nozzle through thread cooperation, and the dispersion nozzle is provided with a bifurcated rod.

[0014] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the application.

[0015] The technical solutions of the present application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are meant to explain the present application and are not intended to limit the application. In the drawings:

[0017] Figure 1 is the first direction structure schematic diagram of the lithium battery diaphragm spray preparation processing of the present application;

[0018] Figure 2 is the second direction structure schematic diagram of the lithium battery diaphragm spray preparation processing of the present application;

[0019] Figure 3 is the partial structure schematic diagram of the rotary spraying mechanism of the present application Figure 1 ;

[0020] Figure 4 is the partial structure schematic diagram of the rotary spraying mechanism of the present application Figure 2 ;

[0021] Figure 5 is the structure schematic diagram of the inside of the iron removal spraying box of the present application;

[0022] Figure 6 is the structure schematic diagram of the lower end of the iron removal spraying box of the present application;

[0023] Figure 7 is the structure schematic diagram of the iron removal device of the present application Figure 1 ;

[0024] Figure 8 is the structure schematic diagram of the iron removal device of the present application Figure 2 ;

[0025] Figure 9 is the structure schematic diagram of the inside of the iron removal device of the present application;

[0026] Figure 10 is the structure schematic diagram of the permanent magnet clamp of the present application;

[0027] Figure 11 is the structure schematic diagram of the rotary sprayer of the present application Figure 1 ;

[0028] Figure 12 is the structure schematic diagram of the rotary sprayer of the present application Figure 2 ;

[0029] Figure 13 is the internal cross-sectional structure schematic diagram of the rotary sprayer of the present application;

[0030] Figure 14 is the driving structure schematic diagram of the rotary sprayer of the present application;

[0031] Figure 15 is a structural schematic diagram of the lifting connecting plate of the application;

[0032] Figure 16 is a structural schematic diagram of the rotating arc-shaped cylinder driving rotation of the application.

[0033] In the figure: rotating spraying mechanism 1, iron removal spraying box 2, material receiving cover 3, iron removal device 4, falling pipe 6, connecting pipe 7, center filter frame 8, magnetic lifting screw 9, upper cover plate 10, connecting jack 11, connecting seat 12, magnetic medium rod 13, medium steel plate 14, permanent magnet storage frame 15, permanent magnet clamp 16, permanent magnet 17, clamp frame 18, rotating sprayer 20, collection box 21, connecting pipe 22, centralized thin box 23, linkage driver 24, lifting connecting plate 25, rotating connector 26, center concentration frame 27, dispersion pipeline 28, sealing pressure seat 29, combined tooth plate 30, rotating arc-shaped cylinder 31, dispersion nozzle 32. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below in combination with the drawings and specific embodiments.

[0035] In the description of the present application, it should be understood that the terms "intermediate", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In addition, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can include the first and second features being in direct contact, or can include the first and second features not being in direct contact but being in contact through another feature between them. Also, the first feature "on", "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "under", "below" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Embodiment 1:

[0039] As shown in Figure 1 and Figure 2 A rotating spraying device for coating the surface of a lithium battery separator includes a rack, an introduction mechanism, a rotating spraying mechanism 1 and an exit mechanism arranged in sequence on the rack. The lithium battery separator to be coated is introduced to the rotating spraying mechanism 1 by the introduction mechanism for spraying, and after spraying, it is introduced out by the exit mechanism. The rotating spraying mechanism 1 makes the coating more evenly cover the surface of the lithium battery separator. The rotating spraying mechanism 1 includes a deironing spraying box 2, which is provided with a deironing device 4 for deironing the spraying. The lower end of the deironing spraying box 2 is connected and fixed with a rotating sprayer 20 for uniformly spraying the lithium battery separator.

[0040] The working principle and beneficial effects of the present embodiment are as follows: the introduction mechanism, the rotating spraying mechanism 1 and the exit mechanism on the rack. During spraying, the lithium battery separator to be coated is introduced to the rotating spraying mechanism 1 by the introduction mechanism for spraying, and the prepared PVDF coating is uniformly sprayed onto the surface of the rotating object. After spraying, it is introduced out by the exit mechanism. During the spraying process, the spraying equipment itself rotates, making the coating more evenly cover the surface of the object, avoiding the occurrence of dead angle and uneven thickness, so as to achieve better coating effect. The moving speed, spraying pressure, coating flow and other parameters of the rotating spraying mechanism 1 need to be accurately controlled according to the specific process requirements. The rotating coating speed is 50-150 m / min (the working speed depends on the characteristics of the substrate and coating used and the process conditions).

[0041] The rotary spraying mechanism 1 comprises a deironing spraying box 2, and a deironing device 4 is arranged in the deironing spraying box 2 to deiron the coating added by the filler cylinder through the metering pump, so that the iron element impurities in the coating are adsorbed and discharged; the rotary sprayer 20 is communicated and fixed at the lower end of the deironing spraying box 2 to uniformly spray the lithium battery diaphragm, so that the spraying equipment itself rotates during the spraying process, the coating is more uniformly covered on the surface of the object, the dead angle and uneven thickness of the spraying are avoided, and better coating effect is achieved.

[0042] Embodiment 2

[0043] As shown in Figure 1 — Figure 16 A rotary spraying device for surface coating of a lithium battery diaphragm, the side end of the deironing spraying box 2 is provided with a receiving cover 3, the lower end of the deironing spraying box 2 is communicated with the rotary sprayer 20 through a plurality of falling pipes 6, the side end of the deironing spraying box 2 is provided with a receiving pipe 7, a center filter frame 8 is fixed in the deironing spraying box 2, and the deironing device 4 is inserted and connected to the center filter frame 8.

[0044] The working principle and beneficial effects of the embodiment are as follows: the receiving cover 3 at the side end of the deironing spraying box 2 can be used to realize the adjusted expansion; the rotary sprayer 20 is communicated through the plurality of falling pipes 6 at the lower end of the deironing spraying box 2, the receiving pipe 7 arranged at the side end of the deironing spraying box 2 is communicated with the pipeline guided by the filler cylinder and the metering pump, the coating is added by guiding, the center filter frame 8 is fixed in the deironing spraying box 2, and the deironing device 4 is inserted and connected to the center filter frame 8, so that the filtered impurities after deironing are prevented from flowing out.

[0045] Embodiment 3

[0046] As shown in Figure 1 — Figure 16 A rotary spraying device for surface coating of a lithium battery diaphragm, the center of the center filter frame 8 is provided with a receiving and connecting insertion hole 11, the receiving and connecting insertion hole 11 is inserted and connected with the receiving pipe 7 to communicate the inside of the center filter frame 8, and a plurality of filter holes are arranged at the two ends of the center filter frame 8.

[0047] The working principle and beneficial effects of the embodiment are as follows: the receiving and connecting insertion hole 11 arranged at the center of the center filter frame 8 is inserted and connected with the receiving pipe 7 to communicate the inside of the center filter frame 8, so that the introduced coating is preferentially deironed in the center filter frame 8, and then flows out from the plurality of filter holes at the two ends and falls into the rotary sprayer 20 through the plurality of falling pipes 6.

[0048] Embodiment 4

[0049] As shown in Figure 1 — Figure 16As shown, a rotary spraying device for coating the surface of a lithium battery separator is disclosed. The iron removal device 4 includes an upper cover plate 10, which is disposed at the upper end of the iron removal spraying box 2. Two connecting seats 12 are symmetrically fixed at the lower end of the upper cover plate 10. Multiple magnetic medium rods 13 are disposed between the two connecting seats 12. Multiple medium steel plates 14 are fixed on the magnetic medium rods 13. A permanent magnet storage frame 15 is fixed at the center of the multiple magnetic medium rods 13. A permanent magnet 17 is disposed inside the permanent magnet storage frame 15.

[0050] The working principle and beneficial effects of this embodiment are as follows: The upper cover plate 10 is fastened to the iron removal spray box 2 to achieve sealing. Two connecting seats 12 are symmetrically fixed at the lower end of the upper cover plate 10, and multiple magnetic medium rods 13 are arranged between the two connecting seats 12. Multiple medium steel plates 14 are fixed on the magnetic medium rods 13, and thus large-scale iron removal adsorption is achieved through mutual magnetic attraction. A permanent magnet storage frame 15 is fixed in the center of the multiple magnetic medium rods 13, and a permanent magnet 17 is arranged in the permanent magnet storage frame 15. Thus, large-scale iron removal adsorption is achieved through mutual magnetic attraction of the permanent magnets 17. The magnetic medium rods 13, medium steel plates 14, and permanent magnet storage frame 15 can all be used as magnets for adsorption, effectively improving the removal of iron impurities after the internal ratio of PVDF coating and preventing unnecessary damage in actual use.

[0051] Example 5:

[0052] like Figure 1 — Figure 16 As shown, a rotary spraying device for coating the surface of lithium battery separators is disclosed. The permanent magnet 17 is disposed in a clamping frame 18, which is made of a non-magnetic material. A magnetic lifting screw 9 is rotatably disposed on the clamping frame 18 and is connected to the upper cover plate 10 by a threaded connection.

[0053] The working principle and beneficial effects of this embodiment are as follows: by rotating the magnetic lifting screw 9 on the upper cover plate 10, the permanent magnet 17 is placed in the clamping frame 18. The clamping frame 18 is made of non-magnetic material, so that the clamping frame 18 can be lifted and lowered with the permanent magnet 17 for replacement, preventing unnecessary adsorption due to excessive magnetic attraction from affecting the use.

[0054] Example 6:

[0055] like Figure 1 — Figure 16As shown, a rotary spraying device for coating the surface of a lithium battery separator is disclosed. The rotary sprayer 20 includes a collection box 21, on which multiple connecting pipes 22 are fixed and connected, and the connecting pipes 22 are correspondingly connected to the falling pipes 6. A central thin film box 23 is fixed at the lower end of the dispersing pipe 28, and the collection box 21 is connected to the central thin film box 23 through the dispersing pipe 28. A central concentrating frame 27 is provided inside the collection box 21 for collecting the falling paint, and the lower end of the central concentrating frame 27 is fixed and connected to the dispersing pipe 28.

[0056] The working principle and beneficial effects of this embodiment are as follows: Multiple connecting pipes 22 are fixed and connected to the collection box 21, and the connecting pipes 22 are connected to the falling pipes 6, so that the paint that has been removed from iron and filtered can fall into the collection box 21. It can be centrally distributed through the central collection frame 27 inside the collection box 21. Then, through two relatively small diameter dispersing pipes 28, the paint falls into the lower centralized thin box 23. Combined with the relatively thin space inside the centralized thin box 23, it can be evenly distributed into multiple rotating arc-shaped cylinders 31.

[0057] Example 7:

[0058] like Figure 1 — Figure 16 As shown, a rotary spraying device for coating the surface of a lithium battery separator is provided, wherein the interior of the central frame 27 is provided with a slope.

[0059] The working principle and beneficial effects of this embodiment are as follows: by setting a slope inside the central collection frame 27, it is convenient to carry out centralized stacking, effectively achieving the effect of uniform distribution and preventing the situation of uneven distribution due to non-centralized collection.

[0060] Example 8:

[0061] like Figure 1 — Figure 16 As shown, a rotary spraying device for coating the surface of lithium battery separators is provided. The side end of the collection box 21 is fixed with a linkage driver 24 via a motor base. The linkage driver 24 rotates via a screw shaft. The screw shaft is connected to a lifting connecting plate 25 via a threaded connection. Multiple sealing pressure seats 29 are evenly fixed on the lifting connecting plate 25. The multiple sealing pressure seats 29 are all sealed and inserted into the collection box 23 for longitudinal displacement. A gear is fixed on the screw shaft, and the gear meshes to drive the rotary connector 26.

[0062] The working principle and beneficial effects of this embodiment are as follows: By controlling the side end of the collection box 21 to fix the linkage driver 24 through the motor seat, the linkage driver 24 is driven to rotate through the screw shaft. The rotating screw shaft is connected to the lifting connecting plate 25 through the threaded connection, and then multiple sealing pressure seats 29 are connected through the lifting connecting plate 25 to achieve the adjustment of the up and down lifting of the sealing pressure seats 29.

[0063] Through the sealing pressure seat 29 is sealed in the concentrated thin box 23 in the longitudinal displacement, the screw shaft is fixed with gear, the gear engages transmission rotating connector 26, and then realizes the longitudinal extrusion lifting while driving the rotating connector 26 linkage.

[0064] Embodiment 9:

[0065] As shown in Figure 1 — Figure 16 A rotating spraying device for lithium battery diaphragm surface coating, the rotating connector 26 includes a combination gear plate 30, the gear on the screw shaft is driven by engaging the combination gear plate 30, the combination gear plate 30 is driven by engaging the gear and the rack with a plurality of rotating arc cylinders 31, and the plurality of rotating arc cylinders 31 rotate uniformly at the lower end of the concentrated thin box 23.

[0066] The working principle and beneficial effects of the embodiment are that the gear on the screw shaft is driven by engaging the combination gear plate 30, the combination gear plate 30 is driven by engaging the gear and the rack with a plurality of rotating arc cylinders 31, and the plurality of rotating arc cylinders 31 rotate uniformly at the lower end of the concentrated thin box 23, and the sealing pressure seat 29 is inserted in the rotating arc cylinder 31, that is, the coating is pressed down while rotating.

[0067] Embodiment 10:

[0068] As shown in Figure 1 — Figure 16 Figure 1 Figure 16 A rotating spraying device for lithium battery diaphragm surface coating, the sealing pressure seat 29 is inserted in the rotating arc cylinder 31, the lower end of the rotating arc cylinder 31 is connected with the dispersion nozzle 32 through thread cooperation, and the dispersion nozzle 32 is provided with a bifurcated rod.

[0069] The working principle and beneficial effects of the embodiment are that the sealing pressure seat 29 is pressed down and matched with the rotating arc cylinder 31, and then the coating is uniformly dispersed on the lithium battery diaphragm surface coating through the dispersion nozzle 32, ensuring that the dispersed coating is uniform, and the dispersion nozzle 32 is provided with a bifurcated rod to ensure that the spraying is as mist as possible.

[0070] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by ordinary skilled in the art within the scope of the present application also belong to the protection scope of the present application.

Claims

1. A rotary spray device for surface coating of lithium battery separators, characterized by: The utility model relates to a lithium battery diaphragm spraying device, including frame, frame is sequentially provided with introduction mechanism, rotary spraying mechanism (1) and lead-out mechanism, through introduction mechanism with to be coated lithium battery diaphragm is introduced to rotary spraying mechanism (1) place and sprays, sprays through lead-out mechanism and leads out, through rotary spraying mechanism (1) makes coating more evenly cover in lithium battery diaphragm surface, rotary spraying mechanism (1) includes iron removal spraying box (2), add the iron removal device (4) of iron removal spraying to the spraying in iron removal spraying box (2) and set up, the lower end of iron removal spraying box (2) is communicated and fixes rotary atomizer (20) for the even spraying of lithium battery diaphragm, The side end of the iron removal spraying box (2) is provided with a material receiving cover (3), the lower end of the iron removal spraying box (2) is communicated with the rotary atomizer (20) through a plurality of falling pipes (6), the side end of the iron removal spraying box (2) is provided with a lead-in pipe (7), a center filter frame (8) is fixed in the iron removal spraying box (2), and the iron removal device (4) is inserted and arranged on the center filter frame (8); The iron removal device (4) includes an upper cover plate (10) arranged at the upper end of the iron removal spraying box (2), two connecting seats (12) are fixed symmetrically at the lower end of the upper cover plate (10), a plurality of magnetic medium rods (13) are arranged between the two connecting seats (12), a plurality of medium steel plates (14) are fixed on the magnetic medium rods (13), a permanent magnet storage frame (15) is fixed at the center of the magnetic medium rods (13), and a permanent magnet (17) is arranged in the permanent magnet storage frame (15); The rotary atomizer (20) includes a collecting box (21), a plurality of connecting pipes (22) are fixedly connected and communicated with the collecting box (21), and the connecting pipes (22) are correspondingly communicated with the falling pipes (6); a concentrated thin box (23) is fixedly connected to the lower end of a dispersion pipeline (28), the collecting box (21) is communicated with the concentrated thin box (23) through the dispersion pipeline (28), and a center concentration frame (27) is arranged in the collecting box (21) to concentrate and collect the falling coating; the lower end of the center concentration frame (27) is fixedly connected and communicated with the dispersion pipeline (28); The side end of the collecting box (21) is fixedly connected with a linkage driver (24) through a motor base, the linkage driver (24) rotates through a screw shaft, the screw shaft is connected with a lifting connecting plate (25) through thread cooperation, a plurality of sealing pressure seats (29) are uniformly fixed on the lifting connecting plate (25), the plurality of sealing pressure seats (29) are sealingly inserted into the concentrated thin box (23) to move longitudinally, a gear is fixed on the screw shaft, and the gear engages and drives a rotary connector (26); The rotary connector (26) includes a combined tooth plate (30), the gear on the screw shaft engages and drives the combined tooth plate (30) through engagement transmission, the combined tooth plate (30) engages and drives a plurality of rotary arc-shaped cylinders (31) through a gear and a rack, and the plurality of rotary arc-shaped cylinders (31) are uniformly rotated at the lower end of the concentrated thin box (23); The sealing pressure seat (29) is correspondingly sealingly inserted into the rotary arc-shaped cylinder (31), the lower end of the rotary arc-shaped cylinder (31) is connected with a dispersion nozzle (32) through thread cooperation, and the dispersion nozzle (32) is provided with a bifurcated rod.

2. A rotary spray device for coating the surface of a lithium battery separator according to claim 1, characterized in that: The center of the center filter frame (8) is provided with a lead-in jack (11), the lead-in jack (11) is connected with the lead-in pipe (7) to communicate the inside of the center filter frame (8), and the two ends of the center filter frame (8) are provided with a plurality of filter holes.

3. A rotary spray device for coating the surface of a lithium battery separator according to claim 1, characterized in that: The permanent magnet (17) is arranged in the clamping frame (18), the clamping frame (18) is made of non-magnetic material, the magnetic lifting screw (9) is rotatably arranged on the clamping frame (18), and the magnetic lifting screw (9) is connected to the upper cover plate (10) through thread cooperation.

4. A rotary spray device for coating the surface of a lithium battery separator according to claim 1, characterized in that: The inside of the center concentration frame (27) is provided with a slope.

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