Double-sided coating device and method

Abstract

The invention relates to the technical field of lithium batteries, in particular to a double-sided coating device and method, and aims to solve the problem that an existing battery pole piece is poor in coating uniformity and consistency. Therefore, the double-sided coating device comprises an unwinding mechanism, a power transmission mechanism, a drying oven, a coating mechanism and a winding mechanism. Wherein the unwinding mechanism is used for conveying a base material; the power transmission mechanism is electrically connected with the base material; a base material is allowed to penetrate through the oven, a magnetic field generating device and a heating component are arranged in the oven, the magnetic field generating device can provide buoyancy for the electrified base material, and the heating component can bake the base material; the coating mechanism is arranged between the unwinding mechanism and the drying oven and is used for coating the first surface and the second surface of the base material with slurry; and the winding mechanism is used for winding the base material coated with the slurry. The base material can be suspended or semi-suspended in the drying oven through the magnetic field generating device, contact between the base material and the oven wall is reduced, adhesion and pollution are avoided, and therefore the uniformity and consistency of base material coating are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and particularly provides a double-sided coating device and method. Background Art

[0002] In the process of manufacturing lithium batteries, the coating process is a key step that determines the performance of the battery. There are many drawbacks in the traditional single-sided coating process, such as foil waste, low production efficiency, high energy consumption, and unstable quality of the electrode sheet. Especially during the roll change process, the generation of empty foil and single-sided foil not only increases material waste but also requires frequent manual debugging and first inspection, resulting in a double waste of production time and labor costs.

[0003] To solve the above problems, double-sided coating technology has emerged. However, how to effectively arrange the die head position, avoid slurry dropping, and achieve suspended drying during the double-sided coating process has become a technical problem to be solved urgently. Although there are already solutions in the industry that use a pneumatic floating oven for drying, the floating characteristics of the pneumatic floating roller may cause slight deviations during the coating drying process, affecting the uniformity and consistency of the coating. In addition, the high-speed hot air system not only consumes a high amount of energy but also places higher requirements on the strength and stability of the raw materials, increasing the procurement cost.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem of poor coating uniformity and consistency in existing battery electrode sheets.

[0006] In a first aspect, the present invention provides a double-sided coating device, including:

[0007] A unwind mechanism for transporting a substrate;

[0008] A power transmission mechanism adapted to be electrically connected to the substrate;

[0009] An oven through which the substrate is allowed to pass, and a magnetic field generating device and a heating member are provided in the oven. The magnetic field generating device can provide buoyancy to the energized substrate, and the heating member can bake the substrate;

[0010] A coating mechanism disposed between the unwind mechanism and the oven, and the coating mechanism can coat slurry on the first surface and the second surface of the substrate; and

[0011] A winding mechanism for winding the substrate after coating the slurry.

[0012] In the preferred technical solution of the above double-sided coating device, the magnetic field generating device includes a yoke, pole columns and coils. There are two pole columns, and the two pole columns are arranged oppositely on the yoke. There are two coils, and the two coils are respectively arranged on the two pole columns. A magnetic field air gap is formed between the two coils, and the substrate can pass through the magnetic field air gap.

[0013] In the preferred technical solution of the above double-sided coating device, the magnetic field generating device further includes legs. The bottom end of the legs is fixedly connected to the inner wall of the oven, the yoke is fixedly arranged on the top of the legs, and the height of the legs is adjustable.

[0014] In the preferred technical solution of the above double-sided coating device, a plurality of magnetic field generating devices are arranged along the transmission direction of the substrate, and the plurality of magnetic field generating devices are arranged in a line.

[0015] In the preferred technical solution of the above double-sided coating device, the coating mechanism includes a first coating head and a second coating head arranged at intervals on both sides of the substrate. The discharge port of the first coating head faces the first surface of the substrate, and the discharge port of the second coating head faces the second surface of the substrate.

[0016] In the preferred technical solution of the above double-sided coating device, the double-sided coating device further includes guide rollers. Guide rollers are arranged at the discharge end of the unwinding mechanism, between the first coating head and the second coating head, and at the feed end of the winding mechanism.

[0017] In the preferred technical solution of the above double-sided coating device, there are two sets of heating components, and the two sets of heating components are respectively arranged on both sides of the substrate.

[0018] In the preferred technical solution of the above double-sided coating device, the heating component is an infrared lamp, and there are a plurality of infrared lamps, and the plurality of infrared lamps are arranged at intervals along the transmission direction of the substrate.

[0019] In the preferred technical solution of the above double-sided coating device, an air inlet and an air outlet are further opened on the oven.

[0020] In a second aspect, the present invention further provides a double-sided coating method, which is applied to the above double-sided coating device, and the double-sided coating method includes:

[0021] S100: Connect the positive and negative electrodes of the power transmission mechanism to the substrates on the unwinding mechanism and the winding mechanism respectively, and start the unwinding mechanism and the winding mechanism to transport the substrate;

[0022] S200: Start the coating mechanism to coat the slurry on the first surface and the second surface of the substrate;

[0023] S300: Start the magnetic field generating device in the oven to suspend the substrate in the oven;

[0024] S400: Start the heating component in the oven to dry the slurry coated on the substrate;

[0025] S500: Transport the dried substrate to the winding mechanism and wind it up through the winding mechanism.

[0026] Those skilled in the art can understand that the present invention provides a double-sided coating device, including: an unwinding mechanism, a power transmission mechanism, an oven, a coating mechanism, and a winding mechanism. Among them, the unwinding mechanism is used to transport the substrate; the power transmission mechanism is adapted to be electrically connected to the substrate; the oven allows the substrate to pass through it, and there are a magnetic field generating device and a heating component in the oven. The magnetic field generating device can provide buoyancy to the energized substrate, and the heating component can bake the substrate; the coating mechanism is arranged between the unwinding mechanism and the oven, and the coating mechanism can coat the slurry on the first side and the second side of the substrate; the winding mechanism is used to wind up the substrate after the slurry is coated. In the case of adopting the above technical means, the present invention can improve the uniformity and consistency of the coating of the battery electrode sheet. Specifically, by arranging a magnetic field generating device and a heating component inside the oven, the magnetic field generating device uses the electromagnetic principle to apply buoyancy to the energized substrate, making it suspended or semi-suspended in the oven, reducing the contact with the box wall, which helps to avoid adhesion and contamination, thereby improving the uniformity and consistency of the substrate coating; at the same time, the heating component provides the necessary heat to bake the substrate to quickly cure the coated slurry, thereby ensuring the coating quality and effect of the electrode sheet.

[0027] Furthermore, the coating mechanism of the present invention includes a first coating head and a second coating head arranged at intervals on both sides of the substrate. The discharge port of the first coating head faces the first side of the substrate, and the discharge port of the second coating head faces the second side of the substrate. This ensures that the coating material can be accurately coated on the two surfaces of the substrate, thereby realizing double-sided coating, and can achieve precise control of the thickness and uniformity of the coating layer, which helps to improve the quality and consistency of the coating layer.

[0028] Even further, the double-sided coating device of the present invention further includes a guide roller. Guide rollers are arranged at the discharge end of the unwinding mechanism, between the first coating head and the second coating head, and at the feed end of the winding mechanism. By setting this structure, the fluctuation and wrinkle of the substrate during transmission can be reduced, which helps to maintain the integrity and consistency of the coating layer, thereby further improving the coating quality. Description of the Drawings

[0029] The following describes the preferred embodiments of the present invention in conjunction with the drawings, in which:

[0030] Figure 1 is a schematic structural view of the double-sided coating device of the present invention;

[0031] Figure 2 is a schematic structural view of the magnetic field generating device of the present invention;

[0032] Figure 3 is a flowchart of the double-sided coating method of the present invention.

[0033] List of reference numerals:

[0034] 100, base material;

[0035] 1, unwinding mechanism;

[0036] 2, power transmission mechanism;

[0037] 3, oven; 31, magnetic field generating device; 311, yoke; 312, pole column; 313, coil; 314, magnetic field air gap; 315, leg; 32, heating member; 33, air inlet; 34, air outlet;

[0038] 4, coating mechanism; 41, first coating head; 42, second coating head;

[0039] 5, winding mechanism;

[0040] 6, guide roller. Detailed implementation manners

[0041] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention. For example, although the following implementation manners are introduced in combination with the double-sided coating device, the double-sided coating device provided by the present invention is also applicable to other products that need to solve the problem of uneven coating.

[0042] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] Based on the problems of poor uniformity and consistency in the existing coating of battery electrode sheets pointed out in the background art, the present invention provides a double-sided coating device, aiming to make the electrode sheet float and be baked after coating through suspension technology, so as to effectively solve the problems of poor uniformity and consistency in the coating of battery electrode sheets.

[0044] As Figure 1As shown in the figure, the present invention provides a double-sided coating device, including: an unwinding mechanism 1, a power transmission mechanism 2, an oven 3, a coating mechanism 4, and a winding mechanism 5. Among them, the unwinding mechanism 1 is used to convey the substrate 100; the power transmission mechanism 2 is adapted to be electrically connected to the substrate 100; the oven 3 allows the substrate 100 to pass through it, and there is a magnetic field generating device 31 and a heating member 32 in the oven 3. The magnetic field generating device 31 can provide buoyancy to the energized substrate 100, and the heating member 32 can bake the substrate 100; the coating mechanism 4 is arranged between the unwinding mechanism 1 and the oven 3, and the coating mechanism 4 can coat the slurry on the first side and the second side of the substrate 100; the winding mechanism 5 is used to wind the substrate 100 after the slurry is coated.

[0045] The unwinding mechanism 1 is the starting point of the entire coating process. The main responsibility of the unwinding mechanism 1 is to stably and continuously convey the substrate 100. Through the unwinding mechanism 1 of the present invention, it can be ensured that the substrate 100 remains flat during the conveying process, without wrinkles or stretching, so as to ensure the quality of subsequent coating and baking. Exemplarily, in the present invention, the substrate 100 is a metal foil.

[0046] The power transmission mechanism 2 is adapted to be electrically connected to the substrate 100 to provide the necessary current to the substrate 100. In the subsequent oven 3 step, the energized substrate 100 will interact with the magnetic field generating device 31 to produce a buoyancy effect. This design not only helps to reduce the direct contact between the substrate 100 and the internal components of the oven 3, reduce friction and wear, thereby protecting the slurry coated on the substrate 100 from being damaged, and improving the uniformity and efficiency of baking.

[0047] The oven 3 is one of the core components of the coating device, and it is equipped with a magnetic field generating device 31 and a heating member 32 inside. The magnetic field generating device 31 uses the electromagnetic principle to apply buoyancy to the energized substrate 100, making it suspended or semi-suspended in the oven 3, reducing the contact with the box wall, which helps to avoid the adhesion and contamination of the slurry on the substrate 100, thereby improving the uniformity and consistency of the coating of the substrate 100. At the same time, the heating member 32 provides the necessary heat to bake the substrate 100 to quickly cure the coated slurry.

[0048] The coating mechanism 4 is located between the unwinding mechanism 1 and the oven 3, and is responsible for coating the slurry on the first side and the second side of the substrate 100 to ensure the uniformity of coating and the consistency of thickness.

[0049] The winding mechanism 5 is the end point of the coating process, and the winding mechanism 5 is responsible for winding the substrate 100 after the slurry is coated and baked.

[0050] Preferably, as Figure 2As shown, the magnetic field generating device 31 includes a yoke 311, pole columns 312, and coils 313. There are two pole columns 312, which are oppositely arranged on the yoke 311. There are two coils 313, which are respectively arranged on the two pole columns 312. A magnetic field air gap 314 is formed between the two coils 313, and the base material 100 can pass through the magnetic field air gap 314.

[0051] The yoke 311 is the basic part of the magnetic field generating device 31, and the yoke 311 plays a role in supporting and conducting the magnetic field. It should be noted that the yoke 311 is made of a magnetic material, such as iron or steel, which has a high magnetic permeability and a low magnetic resistance, and can effectively transfer the magnetic field from one part to another part.

[0052] The pole columns 312 are two opposite parts arranged on the yoke 311, and they together with the yoke 311 form the path of the magnetic field. It should be noted that the pole columns 312 are made of the same material as the yoke 311 to ensure the continuity and stability of the magnetic field.

[0053] The two coils 313 are respectively arranged on the two pole columns 312, and they are the key parts for generating the magnetic field. When an electric current passes through the coils 313, a magnetic field will be generated between the pole columns 312 and the yoke 311. It should be noted that the coils 313 are made of a conductive material (such as copper or aluminum) and are wound into a specific shape and number of turns to generate the required magnetic field strength and direction.

[0054] A magnetic field air gap 314 is formed between the two coils 313, which is the space through which the base material 100 can pass. It should be noted that the width of the magnetic field air gap 314 is adapted to the width of the base material 100, so that the magnetic field air gap 314 can not only accommodate the passage of the base material 100, but also maintain a sufficient magnetic field strength to generate buoyancy.

[0055] When the base material 100 is electrified under the action of the power transmission mechanism 2, it will enter the magnetic field air gap 314 in the oven 3. At this time, the current in the coils 313 will generate a magnetic field between the pole columns 312 and the yoke 311, and this magnetic field interacts with the electrified base material 100 to generate a buoyancy effect. This buoyancy helps the base material 100 to be stably suspended and the flatness to be maintained during the baking process, thereby improving the quality and consistency of the coating layer.

[0056] Preferably, as Figure 1 shown, the magnetic field generating device 31 further includes legs 315. The bottom end of the legs 315 is fixedly connected to the inner wall of the oven 3, the yoke 311 is fixedly arranged on the top of the legs 315, and the height of the legs 315 is adjustable.

[0057] Exemplarily, the bottom end of the support leg 315 is connected to the inner wall of the oven 3 by bolts or welding to ensure that the magnetic field generating device 31 can be firmly installed in the oven 3. This connection method is not only stable and reliable but also helps to reduce the vibration and displacement of the magnetic field generating device 31 during the baking process.

[0058] The yoke 311 is fixedly arranged on the top of the support leg 315, forming an integral structure with the support leg 315. This design makes the magnetic field generating device 31 more compact and stable, helping to improve its working efficiency and lifespan.

[0059] In the present invention, the height of the support leg 315 is designed to be adjustable, so that the height of the magnetic field generating device 31 can be adjusted according to actual needs. This flexibility enables the device to adapt to substrates 100 of different thicknesses and sizes, as well as different coating and baking requirements. At the same time, the adjustable height also helps to optimize the magnetic field distribution and improve the uniformity and consistency of the coating layer.

[0060] In addition, the design of the support leg 315 makes the installation and debugging of the magnetic field generating device 31 more convenient. By adjusting the height and position of the support leg 315, the distance and angle between the magnetic field generating device 31 and the substrate 100 can be conveniently adjusted, thereby optimizing the coating and baking effects. Further, the support leg 315 also provides additional support points, helping to protect the magnetic field generating device 31 from damage during transportation and installation.

[0061] Preferably, as Figure 1 shown, a plurality of magnetic field generating devices 31 are arranged along the transmission direction of the substrate 100, and the plurality of magnetic field generating devices 31 are arranged in a line.

[0062] To enhance the buoyancy effect on the substrate 100, the present invention arranges a plurality of magnetic field generating devices 31 along the transmission direction of the substrate 100. These magnetic field generating devices 31 are arranged in a line, that is, they are arranged in sequence along the conveying path of the substrate 100. The magnetic field generating devices 31 arranged in a line can ensure that the substrate 100 is continuously subjected to the buoyancy force of the magnetic field during transmission. This layout helps to maintain the flatness of the substrate 100 and prevent it from deforming or wrinkling during the baking process. At the same time, the plurality of magnetic field generating devices 31 can also perform segmented baking on the substrate 100 as needed to better control the baking temperature and time and improve the quality and consistency of the coating layer.

[0063] In addition, the magnetic field intensity of each magnetic field generating device 31 can be changed by adjusting the current in the coil 313. In this way, the buoyancy force generated by each magnetic field generating device 31 can be precisely controlled according to the material, thickness, and baking requirements of the substrate 100. This flexibility enables the device to adapt to different types of substrates 100 and coating requirements.

[0064] Preferably, asFigure 1 As shown, the coating mechanism 4 includes a first coating head 41 and a second coating head 42 that are spaced apart on both sides of the substrate 100. The discharge port of the first coating head 41 faces the first surface of the substrate 100, and the discharge port of the second coating head 42 faces the second surface of the substrate 100.

[0065] The coating mechanism 4 consists of two independent coating heads, namely the first coating head 41 and the second coating head 42. These two coating heads are respectively arranged on both sides of the substrate 100 to ensure that the first surface and the second surface of the substrate 100 can be coated simultaneously. The discharge port of the first coating head 41 faces the first surface of the substrate 100, while the discharge port of the second coating head 42 faces the second surface of the substrate 100. This design ensures that the coating material can be accurately coated on the two surfaces of the substrate 100, thereby realizing double-sided coating.

[0066] In addition, a certain interval is maintained between the two coating heads in the present invention, which can avoid mutual interference during the coating process. At the same time, this interval also helps to maintain the stability of the substrate 100 during transmission and prevent scratches or damages caused by the contact of the coating heads.

[0067] By precisely controlling the moving speed of the coating head, the discharge amount, as well as the shape and size of the coating head, precise control of the thickness and uniformity of the coating layer can be achieved. This control helps to improve the quality and consistency of the coating layer.

[0068] Preferably, as Figure 1 shown, the double-sided coating device further includes a guide roller 6. Guide rollers 6 are provided at the discharge end of the unwinding mechanism 1, between the first coating head 41 and the second coating head 42, and at the feed end of the winding mechanism 5.

[0069] Setting a guide roller 6 at the discharge end of the unwinding mechanism 1 can ensure that the substrate 100 is smoothly output from the unwinding mechanism 1 and guide it into the subsequent coating and baking processes. This guide roller 6 plays a role of preliminary flattening and guiding, which helps to reduce the fluctuations and wrinkles of the substrate 100 during transmission.

[0070] Setting a guide roller 6 between the first coating head 41 and the second coating head 42 can further maintain the stability and flatness of the substrate 100. This guide roller 6 not only helps to flatten the substrate 100 again before coating, but also plays a supporting role during the coating process to prevent deformation or damage caused by the pressure of the coating head.

[0071] Setting a guide roller 6 at the feed end of the winding mechanism 5 can ensure that the substrate 100 after coating can smoothly enter the winding mechanism 5 and be wound into a neat product. This guide roller 6 plays a role of guiding and sorting, which helps to maintain the integrity and consistency of the coating layer.

[0072] Preferably, as Figure 1 shown, two sets of heating members 32 are provided, and the two sets of heating members 32 are respectively arranged on both sides of the substrate 100.

[0073] The heating system consists of two sets of heating members 32, which are respectively located on both sides of the substrate 100. This layout not only ensures that the substrate 100 can receive uniform and symmetric heat distribution during baking, thus avoiding deformation or defects caused by uneven heat, but also helps the heat to be more effectively transferred into the substrate 100. This design shortens the baking time, reduces energy consumption, and improves the baking quality.

[0074] In addition, the two sets of heating members 32 in the present invention can be independently controlled, so that the heating temperature and baking time on each side can be adjusted according to actual needs. This flexibility enables the device to adapt to substrates 100 with different materials, thicknesses, and coating requirements, improving the accuracy and efficiency of baking. By adjusting the heating temperature and baking time of the two sets of heating members 32, the baking effect can be optimized, making the coating layer more firm, uniform, and consistent, which helps to improve the durability and aesthetics of the product.

[0075] Preferably, the heating member 32 is an infrared lamp, and a plurality of infrared lamps are arranged at intervals along the transmission direction of the substrate 100.

[0076] The infrared lamp can directly transfer thermal energy to the substrate 100 in a radiation manner without the need for medium transfer, so the heating efficiency is extremely high. This heating method not only shortens the baking time but also improves the baking quality. In addition, the radiation range of the infrared lamp is wide and uniform, which can ensure that the substrate 100 receives uniform and stable heat distribution during baking. This helps to avoid deformation or defects of the substrate 100 caused by uneven heat.

[0077] Preferably, as Figure 1 shown, the oven 3 is also provided with an air inlet 33 and an air outlet 34.

[0078] The air inlet 33 allows fresh air to enter the oven 3. The continuous supply of fresh air can also accelerate the evaporation of moisture on the surface of the substrate 100 and the curing process of the coating layer, thus shortening the baking time; while the air outlet 34 is responsible for discharging the waste gas in the oven 3, which helps to reduce the pressure inside the oven 3 and reduce energy consumption. Thus, this air circulation helps to keep the air inside the oven 3 fresh and avoid the accumulation of harmful gases and vapors generated during baking.

[0079] It should be noted that the present invention does not specifically limit the positions and sizes of the air inlet 33 and the air outlet 34. By adjusting the positions and sizes of the air inlet 33 and the air outlet 34, the heat distribution inside the oven 3 can be optimized. After the fresh air enters the oven 3 from the air inlet 33, it can be mixed with the heat generated by the heating member 32 to form a more uniform hot air environment. At the same time, the air outlet 34 can discharge the hot air inside the oven 3 to avoid local overheating.

[0080] In addition, as Figure 3 shown, the present invention also provides a double-sided coating method. The double-sided coating method is applied to the double-sided coating device described in any of the above embodiments. The double-sided coating method includes:

[0081] S100: Connect the positive and negative electrodes of the power transmission mechanism 2 to the base material 100 on the unwinding mechanism 1 and the base material 100 on the winding mechanism 5 respectively, and start the unwinding mechanism 1 and the winding mechanism 5 to transmit the base material 100;

[0082] S200: Start the coating mechanism 4 to coat the slurry on the first side and the second side of the base material 100;

[0083] S300: Start the magnetic field generating device 31 in the oven 3 to suspend the base material 100 in the oven 3;

[0084] S400: Start the heating member 32 in the oven 3 to dry the slurry coated on the base material 100;

[0085] S500: Transport the dried base material 100 to the winding mechanism 5 and wind it up through the winding mechanism 5.

[0086] First, connect the base material 100 (usually the uncoated raw material) on the unwinding mechanism 1 to the negative electrode of the power transmission mechanism 2, and at the same time connect the base material 100 (which will be used to receive the processed base material 100 after coating and drying) on the winding mechanism 5 to the positive electrode of the power transmission mechanism 2. This connection method ensures that the base material 100 can stably pass through the coating and drying areas during transmission and also guarantees the stability of the power supply to the base material 100.

[0087] When the base material 100 starts to be transmitted, start the coating mechanism 4. The coating mechanism 4 has a first coating head 41 and a second coating head 42, and the first coating head 41 and the second coating head 42 respectively coat the slurry on the first side and the second side of the base material 100.

[0088] Before the substrate 100 enters the oven 3, start the magnetic field generating device 31 in the oven 3. The magnetic field generated by the magnetic field generating device 31 suspends the substrate 100 in the oven 3, avoiding the contact between the substrate 100 and the inner wall of the oven 3, thereby reducing friction and wear, protecting the slurry coated on the substrate 100 from being damaged, and improving the uniformity of the slurry on the surface of the substrate 100.

[0089] When the substrate 100 is suspended in the oven 3, start the heating member 32 in the oven 3. The heat generated by the heating member 32 (such as an infrared lamp) dries the slurry coated on the substrate 100. Further, during the drying process, the power and heating time of the heating member 32 can be adjusted as needed.

[0090] When the substrate 100 passes through the drying area, it is conveyed to the winding mechanism 5. The winding mechanism 5 winds up the dried substrate 100 to form a finished product.

[0091] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A double-sided coating device, characterized in that: include: An unwinding mechanism (1), the unwinding mechanism (1) being used for conveying a substrate (100); A power transmission mechanism (2), the power transmission mechanism (2) being suitable for being electrically connected to the substrate (100); An oven (3), wherein the oven (3) allows the substrate (100) to pass therethrough, wherein the oven (3) has a magnetic field generating device (31) and a heating component (32), wherein the magnetic field generating device (31) can provide buoyancy to the substrate (100) after power is supplied, and the heating component (32) can bake the substrate (100); a coating mechanism (4), the coating mechanism (4) being arranged between the unwinding mechanism (1) and the oven (3), the coating mechanism (4) being capable of coating the first surface and the second surface of the substrate (100) with slurry; and A winding mechanism (5), wherein the winding mechanism (5) is used to wind up the substrate (100) after the slurry is coated.

2. The double-sided coating device according to claim 1, characterized in that: The magnetic field generating device (31) comprises a yoke (311), a pole (312) and a coil (313), wherein two poles (312) are provided, and the two poles (312) are arranged on the yoke (311) in opposite directions, and two coils (313) are provided, and the two coils (313) are arranged on the two poles (312) respectively, and a magnetic field air gap (314) is formed between the two coils (313), and the substrate (100) can pass through the magnetic field air gap (314).

3. The double-sided coating device according to claim 2, characterized in that: The magnetic field generating device (31) further comprises a support leg (315), the bottom end of the support leg (315) is fixedly connected to the inner wall of the oven (3), the yoke (311) is fixedly arranged on the top of the support leg (315), and the height of the support leg (315) is adjustable.

4. The double-sided coating device according to claim 2, characterized in that: A plurality of the magnetic field generating devices (31) are arranged along the transmission direction of the substrate (100), and the plurality of the magnetic field generating devices (31) are arranged in a line.

5. The double-sided coating device according to claim 1, characterized in that: The coating mechanism (4) comprises a first coating head (41) and a second coating head (42) which are arranged at intervals on both sides of the substrate (100); the discharge port of the first coating head (41) faces the first surface of the substrate (100), and the discharge port of the second coating head (42) faces the second surface of the substrate (100).

6. The double-sided coating device according to claim 5, characterized in that: The double-sided coating device further comprises a roller (6), and the roller (6) is arranged at the discharge end of the unwinding mechanism (1), between the first coating head (41) and the second coating head (42), and at the feed end of the winding mechanism (5).

7. The double-sided coating device according to claim 1, characterized in that: The heating components (32) are provided in two groups, and the two groups of heating components (32) are respectively provided on both sides of the substrate (100).

8. The double-sided coating device according to claim 7, characterized in that: The heating component (32) is an infrared lamp, and a plurality of the infrared lamps are provided, and the plurality of the infrared lamps are arranged at intervals along the transport direction of the substrate (100).

9. The double-sided coating device according to claim 1, characterized in that: The oven (3) is also provided with an air inlet (33) and an air outlet (34).

10. A double-sided coating method, the double-sided coating method being applied to the double-sided coating device according to any one of claims 1 to 9, the double-sided coating method comprising: S100: connecting the substrate (100) on the unwinding mechanism (1) and the substrate (100) on the rewinding mechanism (5) to the positive and negative electrodes of the power transmission mechanism (2), respectively, and starting the unwinding mechanism (1) and the rewinding mechanism (5) to transmit the substrate (100); S200: starting a coating mechanism (4) to coat the first surface and the second surface of the substrate (100) with slurry; S300: starting the magnetic field generating device (31) in the oven (3) to suspend the substrate (100) in the oven (3); S400: starting the heating component (32) in the oven (3) to dry the slurry coated on the substrate (100); S5 00: The dried substrate (100) is transported to the winding mechanism (5) and wound up by the winding mechanism (5).

Images