A bio-based aramid coated separator coating apparatus

Abstract

This utility model discloses a coating device for bio-based aramid coating diaphragms, belonging to the field of bio-based aramid coating. The device includes a frame, with a first coating chamber and a second coating chamber formed inside the frame by a fixed partition. The first and second coating chambers are respectively filled with a coupling agent and a bonding accelerator. Multiple guide rollers are rotatably connected to both the first and second coating chambers. A top spraying assembly is symmetrically arranged inside both chambers. The top spraying assembly includes a liquid delivery pipe fixed inside the frame and above the guide rollers, and multiple spray pipes equidistantly fixed to the bottom side of the liquid delivery pipe. A heating assembly is provided inside the second coating chamber, and a drying chamber is fixed to the top of the frame, near the second coating chamber. This utility model, by controlling the liquid level in the coating chambers and combining it with the top spraying assembly, allows for flexible switching between double-sided immersion coating and single-sided spray coating modes, improving the equipment's applicability.

Description

Technical Field

[0001] This utility model relates to the field of bio-based aramid coating, and in particular to a coating device for bio-based aramid coating diaphragms. Background Technology

[0002] The separator is an indispensable component in lithium batteries. Its main function is to isolate the positive and negative electrodes, preventing short circuits that could lead to dangerous situations such as fires and explosions. To enhance separator performance, the industry often coats the separator surface with a coating.

[0003] Coating the surface of aramid fibers with substances such as silane coupling agents can improve the adhesion between aramid fibers and other materials, thereby enhancing bonding performance. Currently, coating equipment for bio-based aramid coated membranes often employs an immersion double-sided coating design, which can achieve uniform coating coverage.

[0004] However, the coating direction should be flexibly selected to achieve the best performance. The immersion double-sided coating design has a single coating mode and lacks flexibility. It is not convenient to switch to single-sided coating (coating towards the simulated positive or negative electrode side) according to the different requirements of the diaphragm performance. Adjusting the coating method is relatively difficult, which leads to problems that affect production efficiency and practicality. Utility Model Content

[0005] This invention provides a coating device for bio-based aramid coated diaphragms, which can solve the problems of existing coating devices for bio-based aramid coated diaphragms having a single coating mode, insufficient flexibility, and difficulty in flexibly switching to single-sided coating according to the differentiated requirements of diaphragm performance.

[0006] A coating device for bio-based aramid coated diaphragms includes a frame. A first coating chamber and a second coating chamber are formed inside the frame by a fixed partition. The first coating chamber and the second coating chamber are respectively filled with a coupling agent and a bonding promoter. Multiple guide rollers are rotatably connected inside the first coating chamber and the second coating chamber. A top spraying assembly is symmetrically arranged inside the first coating chamber and the second coating chamber. The top spraying assembly includes an infusion pipe fixed inside the frame and above the guide rollers and multiple spray pipes fixed at equal intervals to the bottom side of the infusion pipe.

[0007] The second coating chamber is equipped with a heating assembly, and a drying chamber is fixedly installed on the top of the frame and on the side near the second coating chamber. A plurality of conveying rollers located above the guide rollers are rotatably connected to the top side of the frame.

[0008] Preferably, the drying chamber is provided with two hot air drying components located on the upper and lower sides of the bio-based aramid coated diaphragm. A hot air blower is provided on one side of the frame to cooperate with the hot air drying components. A heat exchange component is provided on one side of the hot air blower. The heat exchange component is connected to the drying chamber and is used to preheat the air intake of the hot air blower.

[0009] Preferably, the heat exchange assembly includes a heat exchange chamber, an air inlet at one end of the heat exchange chamber, a plurality of L-shaped heat exchange tubes fixed inside the heat exchange chamber, a distribution plate, and a guide duct fixed at the end of the heat exchange chamber opposite to the air inlet. The guide duct is connected to the inlet of a hot air blower, and one end of each heat exchange tube passes through the air inlet and is connected to the distribution plate. The distribution plate is connected to the drying chamber.

[0010] Preferably, a delivery pump is provided on the outside of the frame and on one side of the first coating chamber and the second coating chamber. The inlet of the delivery pump is connected to the corresponding first coating chamber and the second coating chamber through a pipe, and the delivery pipe is connected to the outlet of the corresponding delivery pump.

[0011] Preferably, the heating assembly includes heaters symmetrically fixed to the bottom wall of the second coating chamber and temperature sensors fixed to the side wall of the second coating chamber.

[0012] Preferably, the hot air drying assembly includes an air supply pipe fixed inside the drying chamber, a plurality of branch pipes uniformly fixed on the air supply pipe, and a plurality of air outlet pipes uniformly fixed on the branch pipes.

[0013] Preferably, a fan is fixed on the side of the drying chamber away from the hot air blower, and the outlet of the fan is connected to the distribution plate through a conveying pipe.

[0014] Preferably, the outlet end of the hot air blower is fixedly connected to a connecting pipe, all of the air supply pipes are connected to the connecting pipe, and a valve is provided on the lower air supply pipe.

[0015] Preferably, both the first coating chamber and the second coating chamber are provided with a drain pipe on the side near the bottom, and the drain pipe is also provided with a valve.

[0016] Preferably, the air outlet pipe is inclined toward the fan side, and the liquid spray pipe is inclined toward the joint between the bio-based aramid coated diaphragm and the guide roller.

[0017] This invention provides a coating device for bio-based aramid coated diaphragms, which has the following beneficial effects:

[0018] 1. By controlling the liquid level in the coating chamber, the liquid can either immerse the diaphragm or remain in contact with it. Combined with the top spraying assembly, it allows for flexible switching between double-sided immersion coating and single-sided spray coating modes, improving the equipment's applicability and meeting various process requirements, making it highly practical. During double-sided coating, the diaphragm is immersed in coupling agent and adhesion promoter to ensure uniform coverage on both sides. During single-sided coating, the liquid level is lowered to below the guide roller, and a storage cavity is formed at the junction of the diaphragm and guide roller using the spray pipe, achieving precise single-sided coating.

[0019] 2. By setting up heat exchange components to recover the waste heat discharged from the drying chamber, the waste heat air is drawn out by the fan and flows inside the heat exchange tube to exchange heat with the air entering through the air inlet. The preheated fresh air is then supplied to the hot air fan, which helps to reduce energy consumption and achieve efficient and energy-saving production. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a coating device for bio-based aramid coated diaphragms provided by this utility model. Figure 1 ;

[0021] Figure 2 A schematic diagram of the structure of a coating device for bio-based aramid coated diaphragms provided by this utility model. Figure 2 ;

[0022] Figure 3 A schematic diagram of the internal structure of the drying chamber of a coating equipment for bio-based aramid coating diaphragms provided by this utility model;

[0023] Figure 4 A schematic cross-sectional view of the frame and drying chamber of a coating device for bio-based aramid coating diaphragms provided by this utility model;

[0024] Figure 5 A schematic diagram of the bio-based aramid coating membrane movement path structure of a coating device for bio-based aramid coating membranes provided by this utility model;

[0025] Figure 6 This is a schematic cross-sectional view of the heat exchange chamber of a coating device for bio-based aramid coated diaphragms, provided by this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Frame; 2. Partition; 3. First coating chamber; 4. Second coating chamber; 5. Guide roller; 6. Conveying roller; 7. Liquid delivery pipe; 8. Delivery pump; 9. Spray pipe; 10. Drying chamber; 11. Air delivery pipe; 12. Branch pipe; 13. Air outlet pipe; 14. Fan; 15. Delivery pipe; 16. Hot air blower; 17. Heat exchange chamber; 18. Air duct; 19. Connecting pipe; 20. Heat exchange tube; 21. Diverter plate; 22. Heater; 23. Temperature sensor; 24. Air inlet; 25. Drain pipe. Detailed Implementation

[0028] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0029] like Figures 1 to 6 As shown in the figure, a coating device for bio-based aramid coated diaphragms provided by this utility model includes a frame 1. A first coating chamber 3 and a second coating chamber 4 are formed inside the frame 1 via a fixed partition 2. The first coating chamber 3 and the second coating chamber 4 are respectively filled with a coupling agent and a bonding accelerator. Multiple guide rollers 5 are rotatably connected inside both the first coating chamber 3 and the second coating chamber 4 to guide the diaphragm to move within the coating chamber. Multiple conveying rollers 6 located above the guide rollers 5 are rotatably connected to the side of the frame 1 near the top to guide the diaphragm to move between the coating chamber and the drying chamber 10. Top spraying assemblies are symmetrically arranged inside the first coating chamber 3 and the second coating chamber 4 to achieve single-sided spraying. The top spraying assembly includes an infusion pipe 7 fixed inside the frame 1 and above the guide roller 5, and a plurality of spray pipes 9 fixed at equal intervals on the bottom side of the infusion pipe 7. A delivery pump 8 is provided outside the frame 1 and on one side of the first coating chamber 3 and the second coating chamber 4. The inlet of the delivery pump 8 is connected to the corresponding first coating chamber 3 and the second coating chamber 4 through a pipe. The infusion pipe 7 is connected to the outlet of the corresponding delivery pump 8.

[0030] During double-sided coating, the coupling agent and adhesion promoter are normally filled inside the coating chamber, and the liquid level covers the side located below the spray pipe 9. When the diaphragm moves inside the coating chamber, the diaphragm is immersed in the coupling agent and adhesion promoter to achieve double-sided coating.

[0031] During single-sided coating, the liquid level is maintained below the bottom of the guide roller 5. The delivery pump 8 draws the liquid from the coating chamber and delivers it to the delivery pipe 7. The liquid is then replenished at the junction of the diaphragm and the guide roller 5 through the spray pipe 9. A storage cavity is formed at the junction of the diaphragm and the guide roller 5. Coating is completed when the diaphragm moves and comes into contact with the liquid inside the storage cavity. Simultaneously, the liquid at both ends of the storage cavity flows into the coating chamber for use.

[0032] The diaphragm surface is coated with substances such as silane coupling agents. One end of the coupling agent molecule can chemically react with the groups on the surface of aramid, and the other end can react with the groups on the surface of the material to be bonded or form physical adsorption, thereby playing a bridging role and improving the bonding performance.

[0033] A bonding accelerator is coated on the diaphragm surface. The accelerator can form a thin film with good bonding properties on the aramid surface, improving the bonding effect between aramid and other materials.

[0034] In some specific implementation plans, such as Figure 1 , Figure 3 and Figure 4 As shown, a drying chamber 10 is fixedly installed on the top of the frame 1 and on the side near the second coating chamber 4. The top of the drying chamber 10 is covered with a top cover, which facilitates operation inside the drying chamber 10 and keeps the drying chamber 10 closed. A conveyor roller 6 is also rotatably connected inside the drying chamber 10. PTFE is applied to the outer sides of the conveyor roller 6 and the guide roller 5 to reduce friction and adhesion. Two hot air drying assemblies are located on the upper and lower sides of the bio-based aramid coating diaphragm inside the drying chamber 10. A hot air blower 16 is provided on one side of the frame 1 to work with the hot air drying assemblies, meeting the double-sided drying requirements. The hot air drying assembly includes an air duct 11 fixed inside the drying chamber 10, multiple branch pipes 12 evenly fixed on the air duct 11, and multiple air outlet pipes 13 evenly fixed on the branch pipes 12. The outlet end of the hot air blower 16 is fixedly connected to a connecting pipe 19. All air ducts 11 are connected to the connecting pipes 19. A valve is provided on the lower air duct 11. The valve controls the opening and closing of the bottom air duct 11 so that when performing single-sided coating, the top air outlet pipe 13 can be dried by air outlet from one side.

[0035] The coated diaphragm enters the drying chamber 10. While being transported inside the drying chamber 10, the hot air blower 16 provides hot air, which is evenly blown onto the upper and lower surfaces of the diaphragm through the air supply pipe 11, branch pipe 12 and air outlet pipe 13 to dry the upper and lower surfaces of the diaphragm.

[0036] In some specific implementation plans, in order to improve energy efficiency, such as Figure 1 , Figure 2 and Figure 6As shown, a heat exchange assembly is provided on one side of the hot air blower 16. The heat exchange assembly is connected to the drying chamber 10 and is used to preheat the air intake of the hot air blower 16. The heat exchange assembly includes a heat exchange chamber 17, an air inlet 24 opened at one end of the heat exchange chamber 17, multiple L-shaped heat exchange tubes 20 fixed inside the heat exchange chamber 17, a distribution plate 21, and a guide pipe 18 fixed at the end of the heat exchange chamber 17 opposite to the air inlet 24. The guide pipe 18 is connected to the inlet of the hot air blower 16. One end of each heat exchange tube 20 passes through the air inlet 24 and is connected to the distribution plate 21. The distribution plate 21 is connected to the drying chamber 10. A fan 14 is fixed on the side of the drying chamber 10 away from the hot air blower 16. The outlet of the fan 14 is connected to the distribution plate 21 through a conveying pipe 15. The outer sides of the conveying pipe 15 and the guide pipe 18 are wrapped with an insulation layer to reduce heat loss.

[0037] Waste heat air discharged from drying chamber 10 is drawn out by fan 14 and enters distribution plate 21 through conveying pipe 15. When flowing through L-shaped heat exchange tube 20, it exchanges heat with air entering through air inlet 24. The preheated air enters hot air fan 16 through air duct 18 to realize waste heat recovery.

[0038] In some specific implementation plans, such as Figure 4 and Figure 5 As shown, a heating assembly is installed inside the second coating chamber 4. The heating assembly includes heaters 22 symmetrically fixed to the bottom wall of the second coating chamber 4 and temperature sensors 23 fixed to the side wall of the second coating chamber 4. The heaters 22 and temperature sensors 23 are electrically connected to an external PLC controller to form a heating control system. The temperature sensor 23 can be a PT100 platinum resistance thermometer, and its signal is transmitted to the PLC controller. The heater 22 can be a stainless steel armored electric heating tube, linked to the PLC via a relay. When the temperature sensor 23 detects a value lower than a set threshold, the PLC controller starts the heater 22 and adjusts the relay until the temperature stabilizes within the set range.

[0039] Temperature sensor 23 monitors the temperature of the bonding accelerator in real time, and heater 22 in the second coating chamber 4 adjusts the heating power to ensure the viscosity of the bonding accelerator is stable.

[0040] like Figure 3 and Figure 4 As shown, both the first coating chamber 3 and the second coating chamber 4 are equipped with drain pipes 25 near the bottom. Valves are also installed on the drain pipes 25 to control their opening and closing, allowing for the discharge of liquid agent or the removal of wastewater after cleaning. The exhaust pipe 13 is inclined towards the fan 14 to reduce the impact of vertical airflow pressure and prevent incompletely cured coatings from being blown away or developing ripples by the high-speed airflow. Simultaneously, the inclined airflow guides the fan 14, facilitating the fan 14's capture of exhaust gas. The spray pipe 9 is inclined towards the contact point between the bio-based aramid coating diaphragm and the guide roller 5, allowing for better delivery of the liquid agent to the storage chamber.

[0041] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios:

[0042] in accordance with Figure 5 The diaphragm passes through the guide roller 5 and the conveying roller 6 in sequence. During double-sided coating, the coupling agent and bonding accelerator are normally filled inside the coating chamber. The liquid level of the agent covers the side located below the spray pipe 9. When the diaphragm moves inside the coating chamber, the diaphragm is immersed in the coupling agent and bonding accelerator to achieve double-sided coating.

[0043] During single-sided coating, the liquid level is maintained below the bottom of the guide roller 5. The delivery pump 8 draws the liquid from the coating chamber and delivers it to the delivery pipe 7. The liquid is then replenished at the junction of the diaphragm and the guide roller 5 through the spray pipe 9. A storage cavity is formed at the junction of the diaphragm and the guide roller 5. Coating is completed when the diaphragm moves and comes into contact with the liquid inside the storage cavity. At the same time, the liquid at both ends of the storage cavity flows into the coating chamber for use.

[0044] The coated diaphragm enters the drying chamber 10. While being transported inside the drying chamber 10, hot air is supplied by a hot air blower 16 and evenly blown onto the upper and lower surfaces or one side of the diaphragm via air ducts 11, branch pipes 12, and outlet pipes 13 to dry the diaphragm surface. Simultaneously, waste heat air discharged from the drying chamber 10 is extracted by a fan 14 and enters the distribution plate 21 through a conveying pipe 15. During its flow through the L-shaped heat exchanger tube 20, it exchanges heat with the air entering through the air inlet 24. The preheated air then enters the hot air blower 16 through the air guide duct 18, achieving waste heat recovery.

[0045] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A bio-based aramid coated separator coating apparatus comprising a frame (1), characterized in that, The frame (1) is formed by a fixed partition (2) to form a first coating chamber (3) and a second coating chamber (4). The first coating chamber (3) and the second coating chamber (4) are respectively filled with a coupling agent and a bonding promoter. Multiple guide rollers (5) are rotatably connected inside the first coating chamber (3) and the second coating chamber (4). Top spraying assemblies are symmetrically arranged inside the first coating chamber (3) and the second coating chamber (4). The top spraying assembly includes an infusion pipe (7) fixed inside the frame (1) and located above the guide rollers (5) and multiple spray pipes (9) fixed at equal intervals to the bottom side of the infusion pipe (7). The second coating chamber (4) is equipped with a heating assembly. A drying chamber (10) is fixed on the top of the frame (1) and on the side near the second coating chamber (4). A plurality of conveying rollers (6) located above the guide rollers (5) are rotatably connected to the side of the frame (1) near the top.

2. The coating equipment for a bio-based aramid coated separator as described in claim 1, characterized in that, The drying chamber (10) is equipped with two hot air drying components located on the upper and lower sides of the bio-based aramid coated diaphragm. A hot air blower (16) is provided on one side of the frame (1) to cooperate with the hot air drying components. A heat exchange component is provided on one side of the hot air blower (16). The heat exchange component is connected to the drying chamber (10) and is used to preheat the air intake of the hot air blower (16).

3. The coating equipment for bio-based aramid coated separators as described in claim 2, characterized in that, The heat exchange assembly includes a heat exchange chamber (17), an air inlet (24) at one end of the heat exchange chamber (17), multiple heat exchange tubes (20) fixed inside the heat exchange chamber (17) and having an L-shaped structure, a distribution plate (21), and a guide pipe (18) fixed at one end of the heat exchange chamber (17) opposite to the air inlet (24). The guide pipe (18) is connected to the inlet of the hot air blower (16). One end of each heat exchange tube (20) passes through the air inlet (24) and is connected to the distribution plate (21). The distribution plate (21) is connected to the drying chamber (10).

4. The coating equipment for a bio-based aramid coated separator as described in claim 1, characterized in that, A delivery pump (8) is provided on the outside of the frame (1) and on one side of the first coating chamber (3) and the second coating chamber (4). The inlet of the delivery pump (8) is connected to the corresponding first coating chamber (3) and the second coating chamber (4) through a pipe. The delivery pipe (7) is connected to the outlet of the corresponding delivery pump (8).

5. The coating equipment for a bio-based aramid coated separator as described in claim 4, characterized in that, The heating assembly includes a heater (22) symmetrically fixed on the bottom wall of the second coating chamber (4) and a temperature sensor (23) fixed on the side wall of the second coating chamber (4).

6. The coating equipment for a bio-based aramid coated separator as described in claim 2, characterized in that, The hot air drying assembly includes an air supply pipe (11) fixed inside the drying chamber (10), a plurality of branch pipes (12) uniformly fixed on the air supply pipe (11), and a plurality of air outlet pipes (13) uniformly fixed on the branch pipes (12).

7. The coating equipment for a bio-based aramid coated separator as described in claim 6, characterized in that, A fan (14) is fixed on the side of the drying chamber (10) away from the hot air blower (16), and the outlet of the fan (14) is connected to the distribution plate (21) through the conveying pipe (15).

8. The coating equipment for a bio-based aramid coated separator as described in claim 7, characterized in that, The outlet end of the hot air blower (16) is fixedly connected to a connecting pipe (19), and all the air supply pipes (11) are connected to the connecting pipe (19), and a valve is provided on the lower air supply pipe (11).

9. The coating equipment for a bio-based aramid coated separator as described in claim 1, characterized in that, Both the first coating chamber (3) and the second coating chamber (4) are provided with a drain pipe (25) on the side near the bottom, and the drain pipe (25) is also provided with a valve.

10. The coating equipment for a bio-based aramid coated separator as described in claim 6, characterized in that, The air outlet pipe (13) is inclined toward the fan (14), and the liquid spray pipe (9) is inclined toward the joint between the bio-based aramid coated diaphragm and the guide roller (5).

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