Coating equipment and process for production of aramid fiber coating diaphragm

Abstract

The invention discloses coating equipment and a coating process for production of an aramid fiber coating diaphragm, and belongs to the field of diaphragm production and coating. Coating equipment for aramid fiber coating diaphragm production comprises a dip-coating box, the two sides of the upper portion of the inner wall of the dip-coating box are fixedly connected with a cleaning roller and a drying roller correspondingly, the two sides of the lower portion of the inner wall of the dip-coating box are rotationally connected with positioning rollers correspondingly, and the two sides of the top of the dip-coating box are rotationally connected with steering rollers correspondingly; according to the coating device, through rotation of the multiple sets of stirring paddles in the dip-coating box, all components of a coating solution are evenly mixed, meanwhile, the coating solution at all positions can make contact with the surface of a diaphragm alternately, and therefore the coating effect is effectively improved; and meanwhile, the coating solution around the flow pushing plate is sprayed to the surface of the diaphragm along the flow pushing holes, the mixing and stirring effect is improved, the coating solution and the surface of the diaphragm are subjected to extrusion contact action, the attachment effect of the coating solution is improved, and the final coating quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm production coating, and particularly relates to a coating device and process for producing aramid-coated diaphragms. Background Art

[0002] Lithium-ion batteries are widely used as power sources for various mobile devices due to their high energy density, high working voltage, no memory effect, and long cycle life. A lithium-ion battery generally includes a positive electrode, a negative electrode, a diaphragm, and an electrolyte. The diaphragm, as a barrier between the positive and negative electrodes, plays a crucial role in the performance of the lithium-ion battery. In actual production, in order to improve the thermal stability and mechanical strength of the diaphragm, a layer of high-strength and high-temperature-resistant synthetic fiber aramid is usually coated on its surface to improve the safety of lithium battery use.

[0003] Currently, during the process of dip-coating aramid on the diaphragm, the solution near the periphery of the diaphragm is preferentially consumed, which will cause a concentration difference in the dip-coating solution, resulting in a decline in the coating effect. Therefore, a coating device and process for producing aramid-coated diaphragms are proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that during dip-coating, the solution near the surface of the diaphragm is preferentially consumed, which will cause a concentration difference in the dip-coating solution, resulting in a decline in the coating effect, and to propose a coating device and process for producing aramid-coated diaphragms.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A coating device for producing aramid-coated diaphragms includes a dip-coating tank. On both sides of the upper part of the inner wall of the dip-coating tank, a cleaning roller and a drying roller are respectively fixedly connected. On both sides of the lower part of the inner wall of the dip-coating tank, positioning rollers are rotatably connected. On both sides of the top of the dip-coating tank, turning rollers are rotatably connected. It further includes: a diversion assembly, which is arranged on the outer wall of the dip-coating tank and is used to extract the airflow at the cleaning roller and push it to the drying roller; a stirring assembly, which is arranged in the dip-coating tank and is used to stir the coating solution in the dip-coating tank.

[0007] To improve the coating effect, preferably, two cleaning rollers, two drying rollers, and two positioning rollers are provided at each location. The diaphragm to be coated sequentially passes through the top of the left turning roller, between the two cleaning rollers, between the two left positioning rollers, between the two right positioning rollers, between the two drying rollers, and the top of the right turning roller. On the side of the two cleaning rollers facing the diaphragm, multiple groups of air suction holes are equidistantly arranged, and the air suction holes are communicated with the inner cavity of the cleaning roller. On the side of the two drying rollers facing the diaphragm, multiple groups of air blowing holes are equidistantly arranged, and the air blowing holes are communicated with the inner cavity of the drying roller.

[0008] To improve the coating efficiency, preferably, the flow guiding assembly includes two groups of air pumps, which are symmetrically fixed on the outer walls of both sides of the dip coating tank. The input end and the output end of each air pump are respectively fixed and communicated with an air extraction pipe and an exhaust pipe. Exhaust boxes are fixedly connected to the outer walls of the dip coating tank at both ends of the cleaning roller, and air extraction boxes are fixedly connected to the outer walls of the dip coating tank at both ends of the drying roller. The end of the air extraction pipe far away from the air pump is communicated with the inner cavity of the air extraction box, and the end of the exhaust pipe far away from the air pump is communicated with the inner cavity of the exhaust box.

[0009] To facilitate the collection of the absorbed impurities, preferably, a collection bin is fixedly connected and communicated with the bottom of the air extraction box, and a dust filter plate is fixedly connected at the connection between the inner wall of the air extraction box and the air extraction pipe.

[0010] To improve the quality of the coating solution used, preferably, the stirring assembly includes a stirring shaft. A mounting plate is fixedly connected to the top of the dip coating tank. The stirring shaft is rotatably connected to the bottom of the mounting plate. A plurality of groups of stirring paddles are fixedly arranged on the stirring shaft at equal intervals. A stirring motor is fixedly connected to the top of the mounting plate, and the output shaft of the stirring motor is fixedly connected to the top end of the stirring shaft.

[0011] To improve the coating quality, preferably, pushing plates are fixedly connected to the bottoms of the lowermost stirring paddles. The upper part of the outer wall of the stirring shaft is rotatably connected with a sealing box. The top of the sealing box is fixedly connected to the bottom of the mounting plate. The sealing box is communicated with the inner cavity of the stirring shaft, and the inner cavity of the stirring shaft is communicated with the inner cavity of the pushing plate. A plurality of groups of pushing holes are equidistantly formed at the bottom of the pushing plate.

[0012] Furthermore, an inflation groove is formed in the dip coating tank. A guide air pipe is fixedly connected and communicated with the bottom of the sealing box, and the other end of the guide air pipe is communicated with the inner cavity of the inflation groove. An inflation pipe is fixedly connected and communicated with the side wall of the inflation groove, and the other end of the inflation pipe is communicated with the inner cavity of the exhaust pipe.

[0013] Furthermore, a resistance valve is arranged in the exhaust pipe, and the resistance generated by the resistance valve is the same as the liquid resistance suffered by the pushing holes during exhaust in the dip coating tank.

[0014] A coating process for producing aramid-coated diaphragms is as follows:

[0015] Step 1: Use a microporous diaphragm material to make a diaphragm substrate and perform ionization modification treatment.

[0016] Step 2: Mix aramid fibers and a solvent according to corresponding ratios and stir until they are completely dissolved to form a uniform slurry.

[0017] Step 3: Immerse the cleaned diaphragm substrate into the slurry for coating;

[0018] Step 4: Air-dry the membrane surface that has extended beyond the coating solution.

[0019] Compared with the prior art, the present invention provides a coating device and process for producing aramid coated diaphragms, which has the following beneficial effects:

[0020] 1. The coating equipment for the production of aramid coated diaphragms uses multiple groups of stirring paddles to rotate in the dipping box, so that the components of the coating solution are evenly mixed, and at the same time, the coating solution at each location can alternately contact the diaphragm surface, thereby effectively improving the coating effect; an air pump is used to deliver air into the plug flow plate, so that the coating solution around the plug flow plate is sprayed onto the diaphragm surface along the plug flow hole, thereby improving the mixing and stirring effect, and at the same time, the coating solution is squeezed into contact with the diaphragm surface, thereby increasing the adhesion effect of the coating solution and improving the final coating quality.

[0021] 2. The coating equipment used in the production of aramid coated diaphragms utilizes the diversion effect generated by the operation of the air pump. First, it cooperates with the cleaning roller and the suction hole to clean the diaphragm surface, ensuring the subsequent coating quality; secondly, it cooperates with the drying roller and the blowing hole to air-dry the coated diaphragm surface, effectively improving the diaphragm coating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a coating device for producing aramid coated diaphragms proposed by the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the overall structure of a coating device for producing aramid coated diaphragms proposed by the present invention. Figure 2 ;

[0024] Figure 3 This is a side view half-section structural schematic diagram of a coating device for producing aramid coated diaphragms proposed by the present invention;

[0025] Figure 4 The present invention proposes a coating device for producing aramid coated diaphragm Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0026] Figure 5 This is a partial half-section structural schematic diagram of a coating device for producing aramid coated diaphragms proposed by the present invention;

[0027] Figure 6 The present invention proposes a coating device for producing aramid coated diaphragm Figure 5 Schematic diagram of the structure of the middle B area;

[0028] Figure 7 The present invention proposes a coating device for producing aramid coated diaphragmFigure 5 Schematic diagram of the structure of area C

[0029] Figure 8 Schematic diagram of the internal structure of the air extraction box of a coating device for producing aramid-coated diaphragms proposed by the present invention

[0030] In the figure: 1. Dip coating box; 2. Cleaning roller; 21. Air suction holes; 3. Drying roller; 31. Blowing holes; 4. Positioning roller; 41. Steering roller; 5. Air pump; 51. Air extraction pipe; 52. Exhaust pipe; 53. Exhaust box; 54. Air extraction box; 541. Collection bin; 542. Dust filter plate; 6. Stirring shaft; 61. Mounting plate; 62. Stirring paddle; 63. Stirring motor; 64. Flow pushing plate; 641. Flow pushing holes; 65. Sealing box; 7. Inflation groove; 71. Air guide pipe; 72. Inflation pipe Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention

[0033] Embodiment 1

[0034] Refer to Figures 1-8 , a coating device for producing aramid-coated diaphragms, including a dip coating box 1. On both sides of the upper part of the inner wall of the dip coating box 1, a cleaning roller 2 and a drying roller 3 are respectively fixedly connected. On both sides of the lower part of the inner wall of the dip coating box 1, positioning rollers 4 are rotatably connected. On both sides of the top of the dip coating box 1, steering rollers 41 are rotatably connected. It further includes: a diversion assembly, which is arranged on the outer wall of the dip coating box 1 and is used to extract the airflow at the cleaning roller 2 and push it to the drying roller 3; a stirring assembly, which is arranged in the dip coating box 1 and is used to stir the coating solution in the dip coating box 1

[0035] Refer to Figures 1-3, wherein, there are two cleaning rollers 2, two drying rollers 3 and two positioning rollers 4 respectively. The diaphragm to be coated passes through the top of the left turning roller 41, between the two cleaning rollers 2, between the two left positioning rollers 4, between the two right positioning rollers 4, between the two drying rollers 3 and the top of the right turning roller 41 in sequence. On the side of the two cleaning rollers 2 facing the diaphragm, a plurality of air suction holes 21 are equidistantly arranged, and the air suction holes 21 are communicated with the inner cavity of the cleaning roller 2. On the side of the two drying rollers 3 facing the diaphragm, a plurality of air blowing holes 31 are equidistantly arranged, and the air blowing holes 31 are communicated with the inner cavity of the drying roller 3.

[0036] Through the above structure setting, after the diaphragm is inserted into the coating solution in the dip coating tank 1 and then taken out, the diaphragm is fully contacted with the coating solution. Subsequently, the diaphragm can be pulled to make the diaphragm move in the coating solution, thereby completing the full coating of the diaphragm and effectively improving the coating effect. In addition, the pulling of the diaphragm can be carried out manually or by existing traction equipment, and the pulling rate of the diaphragm is controlled to be 0.1 - 1 m / min to ensure the coating quality of the diaphragm.

[0037] Refer to Figures 1-3 and Figure 5 , wherein, the diversion assembly includes two air pumps 5, and the two air pumps 5 are symmetrically fixed on the outer walls of both sides of the dip coating tank 1. The input end and the output end of the air pump 5 are respectively fixed and communicated with an air suction pipe 51 and an exhaust pipe 52. Exhaust boxes 53 are fixedly connected to the outer walls of the dip coating tank 1 at both ends of the cleaning roller 2, and air extraction boxes 54 are fixedly connected to the outer walls of the dip coating tank 1 at both ends of the drying roller 3. The end of the air suction pipe 51 away from the air pump 5 is communicated with the inner cavity of the air extraction box 54, and the end of the exhaust pipe 52 away from the air pump 5 is communicated with the inner cavity of the exhaust box 53.

[0038] Through the above structure setting, during the coating process, when the air pump 5 is turned on, a suction force will be generated in the air suction pipe 51, and this suction force will be transmitted along the air suction pipe 51 and the air extraction box 54 to the inside of the cleaning roller 2, and finally a suction force will be generated at the plurality of air suction holes 21 on the surface of the cleaning roller 2, so as to extract the air flow around the diaphragm passing between the two cleaning rollers 2. When the air flow flows rapidly, the impurities attached to the surface of the diaphragm will also be taken away, thereby realizing the cleaning of the surface of the diaphragm and ensuring the subsequent coating quality. The air flow that is sucked away will enter the drying roller 3 along the exhaust pipe 52 and the exhaust box 53, and finally be blown onto the surface of the diaphragm by the plurality of air blowing holes 31, thereby realizing the air drying of the coated diaphragm and effectively improving the coating efficiency of the diaphragm.

[0039] Refer to Figure 1 , Figure 8, wherein the bottom of the air extraction box 54 is fixed and connected to a collection bin 541, and a dust filter plate 542 is fixedly connected to the connection between the inner wall of the air extraction box 54 and the air extraction pipe 51; when the air flow carrying impurities enters the air extraction box 54, the dust filter plate 542 is set, and the impurities carried in the air flow will be trapped in the air extraction box 54. Finally, after the suction force in the air extraction box 54 disappears, the impurities will fall into the collection bin 541, so that the impurities can be cleaned up in a centralized manner, which improves the convenience of use and also improves the neatness of the air flow entering the exhaust box 53 later.

[0040] Reference Figure 2 、 Figure 3 and Figure 5 , wherein the stirring assembly includes a stirring shaft 6, a mounting plate 61 is fixedly connected to the top of the dipping box 1, the stirring shaft 6 is rotatably connected to the bottom of the mounting plate 61, a plurality of stirring paddles 62 are fixed at equal intervals on the stirring shaft 6, a stirring motor 63 is fixedly connected to the top of the mounting plate 61, and the output shaft of the stirring motor 63 is fixedly connected to the top of the stirring shaft 6.

[0041] Through the arrangement of the above structure, the stirring motor 63 is turned on, so that the stirring shaft 6 rotates with multiple groups of stirring paddles 62 in the dipping box 1, thereby stirring the coating solution in the dipping box 1, so that the various components of the coating solution are evenly mixed, and at the same time, the coating solution at each location can alternately contact the diaphragm surface, thereby effectively improving the coating effect.

[0042] Reference Figure 2 、 Figures 5-7 , wherein, the bottom of the stirring paddle 62 located at the bottom is fixedly connected to a flow-pushing plate 64, and the upper part of the outer wall of the stirring shaft 6 is rotatably connected to a sealing box 65, the top of the sealing box 65 is fixedly connected to the bottom of the mounting plate 61, the sealing box 65 is connected to the inner cavity of the stirring shaft 6, the inner cavity of the stirring shaft 6 is connected to the inner cavity of the flow-pushing plate 64, and the bottom of the flow-pushing plate 64 is evenly spaced. A plurality of groups of flow-pushing holes 641 are provided at equal intervals; an inflation groove 7 is provided on the dipping box 1, the bottom of the sealing box 65 is fixed and connected to an air guide pipe 71, the other end of the air guide pipe 71 is connected to the inner cavity of the inflation groove 7, the side wall of the inflation groove 7 is fixed and connected to an inflation pipe 72, the other end of the inflation pipe 72 is connected to the inner cavity of the exhaust pipe 52; a resistance valve is provided in the exhaust pipe 52, and the resistance generated by the resistance valve is the same as the liquid resistance encountered by the flow-pushing hole 641 when exhausting in the dipping box 1, so as to ensure that the gas can move along the exhaust pipe 52 and the inflation pipe 72 at the same time.

[0043] With the above structure, when the air pump 5 is working, the gas entering the exhaust pipe 52 will also be diverted to the inflation tank 7 through the inflation pipe 72, then enter the sealing box 65 along the air guide pipe 71, and finally continuously output downward along the inner cavity of the stirring shaft 6 through the flow pushing holes 641, so that the coating solution around the flow pushing plate 64 is sprayed onto the diaphragm surface along the flow pushing holes 641. In this way, firstly, the effect of mixing and stirring is improved, and at the same time, the coating solution is extruded and contacted with the diaphragm surface, thereby increasing the adhesion effect of the coating solution and improving the final coating quality.

[0044] Embodiment 2:

[0045] Referring to Figures 1-8 , which is basically the same as Embodiment 1. On the basis of Embodiment 1, a coating process for producing aramid-coated diaphragms is proposed, and the steps are as follows:

[0046] Step 1: Use a microporous diaphragm material to make a diaphragm substrate and perform ionization modification treatment.

[0047] Step 2: Mix aramid fibers and a solvent according to the corresponding ratio and stir until they are completely dissolved. At the same time, heat the solvent at a low temperature of 40 - 90 degrees Celsius to facilitate the mixing between the aramid fibers and the solvent to form a uniform slurry.

[0048] Step 3: Immerse the cleaned diaphragm substrate in the slurry for coating, and control the diaphragm pulling rate at 0.1 - 1 m / min to ensure the coating quality of the diaphragm.

[0049] Step 4: Air-dry the diaphragm surface that extends beyond the coating solution.

[0050] Referring to Figures 1-8 , in the present invention, first, aramid fibers and a solvent are mixed according to the corresponding ratio in the dipping tank 1 and stirred until they are completely dissolved. At the same time, the solvent is heated at a low temperature to facilitate the mixing between the aramid fibers and the solvent to form a uniform slurry. Then, the diaphragm to be coated is passed through the top of the left turning roller 41, between the two cleaning rollers 2, between the two left positioning rollers 4, between the two right positioning rollers 4, between the two drying rollers 3, and the top of the right turning roller 41 in sequence, so that the diaphragm passes through the coating solution in the dipping tank 1 and then exits, making the diaphragm fully contact with the coating solution. Subsequently, the diaphragm can be pulled to move the diaphragm in the coating solution, thereby completing the full coating of the diaphragm and effectively improving the coating effect.

[0051] While pulling the diaphragm, turn on the air pump 5. A suction force will be generated in the suction pipe 51, and this suction force will be transmitted along the suction pipe 51 and the suction box 54 to the cleaning roller 2. Eventually, a suction force will be generated at multiple air suction holes 21 on the surface of the cleaning roller 2, so as to extract the airflow around the diaphragm passing between the two cleaning rollers 2. When the airflow flows rapidly, the impurities attached to the surface of the diaphragm will also be carried away, thereby realizing the cleaning of the diaphragm surface and ensuring the subsequent coating quality; the sucked airflow will enter the drying roller 3 along the exhaust pipe 52 and the exhaust box 53, and finally blow towards the surface of the diaphragm through multiple air blowing holes 31, thereby realizing the air drying of the coated diaphragm and effectively improving the diaphragm coating efficiency; and after the airflow with impurities enters the suction box 54, due to the setting of the dust filter plate 542, the impurities carried in the airflow will be intercepted in the suction box 54. Eventually, after the suction force in the suction box 54 disappears, the impurities will fall into the collection bin 541 for centralized cleaning of the impurities, improving the convenience of use and at the same time improving the cleanliness of the airflow entering the exhaust box 53 subsequently.

[0052] Meanwhile, turn on the stirring motor 63 so that the stirring shaft 6 drives multiple stirring paddles 62 to rotate in the dip coating tank 1, thereby stirring the coating solution in the dip coating tank 1, making the components of the coating solution evenly mixed, and at the same time enabling the coating solution at each place to alternately contact the surface of the diaphragm, thereby effectively improving the coating effect; and when the air pump 5 is working, the gas entering the exhaust pipe 52 will also be shunted to the inflation tank 7 through the inflation pipe 72, then enter the sealing box 65 along the air guide pipe 71, and finally continuously output downward along the inner cavity of the stirring shaft 6 through the push flow holes 641, so that the coating solution around the push flow plate 64 sprays towards the surface of the diaphragm along the push flow holes 641. In this way, first, the effect of mixing and stirring is improved, and at the same time, the coating solution is in extrusion contact with the surface of the diaphragm, thereby increasing the adhesion effect of the coating solution and improving the final coating quality.

[0053] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A coating device for producing aramid-coated diaphragms, comprising a dip-coating tank (1), characterized in that, On both sides of the upper part of the inner wall of the dip coating tank (1), a cleaning roller (2) and a drying roller (3) are respectively fixedly connected. On both sides of the lower part of the inner wall of the dip coating tank (1), positioning rollers (4) are rotatably connected. On both sides of the top of the dip coating tank (1), turning rollers (41) are rotatably connected. Further included are: A flow guiding assembly, which is arranged on the outer wall of the dip coating tank (1) and is used for extracting the air flow at the cleaning roller (2) and pushing it to the drying roller (3); A stirring assembly, which is arranged in the dip coating tank (1) and is used for stirring the coating solution in the dip coating tank (1).

2. The coating equipment for producing aramid-coated diaphragms according to claim 1, characterized in that, There are two cleaning rollers (2), two drying rollers (3) and two positioning rollers (4) respectively. The diaphragm to be coated passes through the top of the left turning roller (41), between the two cleaning rollers (2), between the two left positioning rollers (4), between the two right positioning rollers (4), between the two drying rollers (3) and the top of the right turning roller (41) in sequence. On the side of the two cleaning rollers (2) facing the diaphragm, a plurality of groups of air suction holes (21) are equidistantly arranged, and the air suction holes (21) are communicated with the inner cavity of the cleaning roller (2). On the side of the two drying rollers (3) facing the diaphragm, a plurality of groups of air blowing holes (31) are equidistantly arranged, and the air blowing holes (31) are communicated with the inner cavity of the drying roller (3).

3. The coating device for producing aramid-coated separator according to claim 2, characterized in that, The flow guiding assembly includes two air pumps (5), which are symmetrically fixed on the outer walls of both sides of the dip coating tank (1). The input end and the output end of the air pump (5) are respectively fixedly connected and communicated with an air suction pipe (51) and an exhaust pipe (52). On the outer walls of the dip coating tank (1) at both ends of the cleaning roller (2), exhaust boxes (53) are fixedly connected. On the outer walls of the dip coating tank (1) at both ends of the drying roller (3), air suction boxes (54) are fixedly connected. The end of the air suction pipe (51) away from the air pump (5) is communicated with the inner cavity of the air suction box (54), and the end of the exhaust pipe (52) away from the air pump (5) is communicated with the inner cavity of the exhaust box (53).

4. The coating equipment for producing aramid-coated diaphragms according to claim 3, characterized in that, The bottom of the air suction box (54) is fixedly connected and communicated with a collection bin (541), and a dust filtering plate (542) is fixedly connected at the connection between the inner wall of the air suction box (54) and the air suction pipe (51).

5. The coating device for producing aramid-coated diaphragms according to claim 3, characterized in that, The stirring assembly includes a stirring shaft (6). The top of the dip coating tank (1) is fixedly connected with a mounting plate (61). The stirring shaft (6) is rotatably connected to the bottom of the mounting plate (61). A plurality of groups of stirring paddles (62) are equidistantly fixed on the stirring shaft (6). The top of the mounting plate (61) is fixedly connected with a stirring motor (63), and the output shaft of the stirring motor (63) is fixedly connected to the top end of the stirring shaft (6).

6. The coating device for producing aramid-coated diaphragms according to claim 5, characterized in that, At the bottom of the stirring paddle (62) located at the lowest position, a flow guiding plate (64) is fixedly connected. On the upper part of the outer wall of the stirring shaft (6), a sealing box (65) is rotatably connected. The top of the sealing box (65) is fixedly connected to the bottom of the mounting plate (61). The sealing box (65) is communicated with the inner cavity of the stirring shaft (6). The inner cavity of the stirring shaft (6) is communicated with the inner cavity of the flow guiding plate (64). And a plurality of groups of flow guiding holes (641) are equidistantly arranged at the bottom of the flow guiding plate (64).

7. The coating device for producing aramid-coated diaphragms according to claim 6, wherein, An air inflation groove (7) is formed in the dip coating tank (1). A gas guiding pipe (71) is fixedly connected and communicated at the bottom of the sealing box (65). The other end of the gas guiding pipe (71) is communicated with the inner cavity of the air inflation groove (7). An air charging pipe (72) is fixedly connected and communicated with the side wall of the air inflation groove (7). The other end of the air charging pipe (72) is communicated with the inner cavity of the exhaust pipe (52).

8. The coating equipment for producing aramid-coated diaphragms according to claim 7, characterized in that, A resistance valve is arranged in the exhaust pipe (52), and the resistance generated by the resistance valve is the same as the liquid resistance suffered by the exhaust of the flow guiding holes (641) in the dip coating tank (1).

9. A coating process for producing aramid-coated diaphragms, using a coating device for producing aramid-coated diaphragms as described in any one of claims 1-8, characterized in that, The steps are as follows: Step 1: Use a microporous diaphragm material to make a diaphragm substrate and perform ionization modification treatment; Step 2: Mix aramid fibers and a solvent according to corresponding ratios and stir until completely dissolved to form a uniform slurry; Step 3: Immerse the cleaned diaphragm substrate in the slurry for coating; Step 4: Air-dry the surface of the diaphragm that extends out of the coating solution.

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