A coating device

Abstract

The utility model discloses a kind of coating devices, including unwinding mechanism, coating mechanism, combined oven, winding mechanism and several over rollers, the coating mechanism includes first coating component, wrinkle removal adjusting roller, second coating component and air float climbing component, the first coating component is used to coat the A face of foil, the second coating component is used to coat the B face of foil, foil after coating is conveyed to the combined oven by the air float climbing component, the combined oven includes box, multiple air float rollers arranged in the box, multiple support rollers and multiple drying components, multiple the air float rollers are up and down staggered arrangement, multiple the support rollers are along horizontal arrangement, multiple the drying components are up and down staggered distribution between adjacent two air float rollers and adjacent two support rollers.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, and specifically to a coating device. Background Technology

[0002] Simultaneous double-sided coating equipment for lithium battery foils is preferred due to its advantages such as saving space, reducing costs, improving efficiency, and enhancing the electrochemical performance of the foils.

[0003] Structurally, a double-sided simultaneous coating equipment generally includes an A-side coating mechanism and a B-side coating mechanism. (Refer to...) Figure 1 The A-side coating mechanism includes a back roller and an A-side coating die. The back roller provides stable support for the back of the foil. The A-side coating die is horizontally arranged and can complete high-quality coating of the A-side. The B-side coating mechanism includes a B-side coating die, which is a staggered lip die. During B-side coating, the foil is conveyed horizontally, and the B-side coating die is vertically upward or downward. The protrusions of the staggered lip die support the B-side foil to ensure that the distance between the lip and the foil in front is stable and accurate, thereby achieving stable coating of the B-side. After the B-side is coated, the foil enters a horizontally arranged oven for drying.

[0004] To prevent damage to the wet coating on the surface of the foil after double-sided coating, several air-floating rollers are installed in the oven to provide non-contact support for the foil. The air-floating rollers are arranged horizontally in sequence.

[0005] However, in the high-temperature environment of the oven, the airflow at the outlet of the air flotation roller is easily disturbed by thermal convection, causing fluctuations in the airflow at the outlet of the air flotation roller, resulting in unstable support. At the same time, the wet coating on the surface of the foil will shrink or warp due to moisture evaporation during the drying process. The non-contact support of the air flotation roller can easily lead to uneven local tension of the foil, causing wrinkles or the formation of several vertical stripes on the foil, which seriously affects the coating quality of the foil. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model provides a coating device that can improve the support stability of foil, ensure uniform tension of foil, avoid wrinkles or vertical stripes on foil, improve the coating quality of foil, and by arranging multiple air-floating rollers arranged in an alternating manner, the length of the combined drying oven can be greatly shortened under the same drying effect, thereby reducing the space occupancy rate of the combined drying oven.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A coating apparatus includes an unwinding mechanism, a coating mechanism, a combined drying oven, a rewinding mechanism, and several guide rollers. The coating mechanism includes a first coating component, a wrinkle-removing adjusting roller, a second coating component, and an air flotation ramp component. The first coating component coats side A of a foil. The wrinkle-removing adjusting roller improves the wrinkling of the foil when it enters the second coating component and adjusts the wrap angle of the foil. The second coating component coats side B of the foil. The coated foil is conveyed to the combined drying oven via the air flotation ramp component. The combined drying oven includes a chamber, a non-contact support component, a contact support component, and several drying components disposed within the chamber. The non-contact support component includes several air flotation rollers, and the contact support component includes several support rollers. The air flotation rollers and the support rollers are arranged sequentially along the conveying direction of the foil. The air flotation rollers are staggered vertically, and the support rollers are arranged horizontally. The drying components are staggered vertically between adjacent air flotation rollers and adjacent support rollers.

[0009] As a further improvement to the above technical solution, the ratio of the conveyor length of the non-contact support component to the conveyor length of the contact support component is 2.5 to 3.5 times.

[0010] As a further improvement to the above technical solution, the first coating assembly includes a first back roller and a first coating die, and the second coating assembly includes an air-bearing back roller and a second coating die. The foil is sequentially wound around the first back roller and the air-bearing back roller to form an S-shaped conveyor path. The lip of the first coating die is inclined upward and is opposite to the first back roller, and the lip of the second coating die is inclined upward and is opposite to the air-bearing back roller.

[0011] As a further improvement to the above technical solution, the lip tilt angle of the first coating die head is in the range of 0 to 60°, and the lip tilt angle of the second coating die head is in the range of 0 to 60°.

[0012] As a further improvement to the above technical solution, the air-bearing back roller includes a metal tube and an outer roller. The outer roller is sleeved on the outer periphery of the metal tube. A cavity is provided in the center of the metal tube along the axial direction. Multiple gas channels are provided in the metal tube along the radial direction. The gas channels are connected to the cavity. The material of the outer roller is a porous material.

[0013] As a further improvement to the above technical solution, the first coating assembly further includes a first translation module, which is used to drive the first coating die head to approach or move away from the first back roller; the second coating assembly further includes a second translation module and an angle adjustment module, which is used to drive the second coating die head to approach or move away from the air-bearing back roller, and the angle adjustment module is used to adjust the tilt angle of the second coating die head.

[0014] As a further improvement to the above technical solution, the angle adjustment module includes a base, a rotating shaft rotatably connected to the base, and a first motor for driving the rotating shaft to rotate. The base is disposed on the second translation module, and the second coating die head is fixed on the rotating shaft.

[0015] As a further improvement to the above technical solution, the second coating die head is a staggered lip die head, which includes an upper lip and a lower lip, the lower lip protruding from the upper lip to form a stagger, and the lower lip abutting against the foil material.

[0016] As a further improvement to the above technical solution, the lower lip has a straight segment and an arc segment, one end of the straight segment is tangent to one end of the arc segment, and the straight segment abuts against the foil.

[0017] As a further improvement to the above technical solution, the air flotation climbing component includes multiple air flotation plates, which are arranged alternately up and down along the conveying direction of the foil. Several air flotation plates on the same side are arranged inclined upward along the conveying direction of the foil. At least one set of edge-flattening wheels is provided between two adjacent air flotation plates. The edge-flattening wheels are used to flatten the edge of the foil.

[0018] As a further improvement to the above technical solution, a correction mechanism and a traction mechanism are provided between the combined drying oven and the winding mechanism. The correction mechanism is used to adjust the position of the foil in the width direction, and the traction mechanism is used to traction the foil.

[0019] As a further improvement to the above technical solution, the traction mechanism includes an active roller, a driven roller, a second motor, and a first cylinder. The second motor is used to drive the active roller to rotate, and the first cylinder is used to drive the driven roller to move closer to or away from the active roller to press or release the foil.

[0020] As a further improvement to the above technical solution, a tension adjustment mechanism is provided between the correction mechanism and the traction mechanism. The tension adjustment mechanism includes a tension roller and a second cylinder for driving the tension roller to move horizontally.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model provides a coating device. By setting up a combined drying oven, it can ensure that the foil material with double-sided wet film coating is supported and dried quickly after entering the combined drying oven, and then transferred to horizontal contact support and dried. This can improve the support stability of the foil material, ensure uniform tension of the foil material, avoid wrinkles or the formation of several vertical stripes on the foil material, and improve the coating quality of the foil material. Moreover, by arranging multiple air flotation rollers arranged vertically and vertically, the length of the combined drying oven can be greatly shortened under the same drying effect, thereby reducing the space occupancy rate of the combined drying oven.

[0023] 2. This utility model provides a coating device. By setting a first coating component and a second coating component, the first coating die head tilted upwards performs wet film coating on the A side of the foil at the first back roller. After the foil is wet film coated, it tilts upwards and moves in an S-shape. Then, the second coating die head tilted upwards performs wet film coating on the B side of the foil at the air-bearing back roller. This makes it convenient for standing workers to observe the A and B sides of the coated foil, and facilitates timely intervention for coating defects, thereby improving the coating quality.

[0024] 3. This utility model provides a coating device. By setting an air flotation climbing component, the foil coated with wet film on both sides is allowed to climb upwards into the combined drying oven through the air flotation climbing component. This enables non-contact support for the foil coated with wet film on both sides, avoids damage to the coating, reduces foil vibration, and improves coating quality. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the structure of a double-sided simultaneous coating equipment in the prior art;

[0027] Figure 2 This is a structural schematic diagram provided by an example of this utility model;

[0028] Figure 3 yes Figure 2 Schematic diagram of the intermediate coating mechanism;

[0029] Figure 4 yes Figure 3 A three-dimensional view of the mid-angle adjustment module and the second coating die;

[0030] Figure 5 yes Figure 2 Schematic diagram of the center correction mechanism, traction mechanism and tension adjustment mechanism;

[0031] Figure 6 yes Figure 3 Enlarged view of point A in the middle;

[0032] Figure 7 yes Figure 3 Cross-sectional view of the air flotation back roller.

[0033] Reference numerals: 100 - Unwinding mechanism;

[0034] 200-Coating mechanism, 210-First coating assembly, 211-First back roller, 212-First coating die head, 213-First translation module, 220-Second coating assembly, 221-Air-float back roller, 222-Second coating die head, 223-Second translation module, 224-Angle adjustment module, 230-Air-float climbing assembly, 231-Air-float plate, 232-Edge spreading wheel assembly, 240-Wrinkle removal adjusting roller, 2211-Metal tube, 2212-Outer roller, 2213-Gas flow channel, 2221-Upper lip, 2222-Lower lip, 2223-Straight section, 2224-Circular section, 2241-Base, 2242-Rotating shaft, 2243-First motor;

[0035] 300 - Combined drying oven, 310 - Oven body, 320 - Air flotation roller, 330 - Support roller, 340 - Drying assembly;

[0036] 400 - Receiving mechanism;

[0037] 500-roller;

[0038] 600 - Correction Agency;

[0039] 700 - Traction mechanism, 710 - Driving roller, 720 - Driven roller, 730 - First cylinder;

[0040] 800 - Tension adjustment mechanism, 810 - Tension roller, 820 - Second cylinder. Detailed Implementation

[0041] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0042] Reference Figure 2 and Figure 3This utility model provides a coating apparatus, including an unwinding mechanism 100, a coating mechanism 200, a combined drying oven 300, a rewinding mechanism 400, and several guide rollers 500. The coating mechanism 200 includes a first coating component 210, a wrinkle-removing adjusting roller 240, a second coating component 220, and an air flotation climbing component 230. The first coating component 210 is used to coat the A-side of the foil. The wrinkle-removing adjusting roller 240 is used to improve the wrinkling situation when the foil enters the second coating component 220 and to adjust the wrap angle of the foil. The second coating component 220 is used for... The B-side of the coated foil is conveyed to the combined oven 300 via the air flotation ramp assembly 230. The first coating assembly 210 includes a first back roller 211 and a first coating die 212. The second coating assembly 220 includes an air flotation back roller 221 and a second coating die 222. The foil is sequentially wound around the first back roller 211 and the air flotation back roller 221 to form an S-shaped conveyor path. The lip of the first coating die 212 is inclined upward and is opposite to the first back roller 211. The lip of the second coating die 222 is inclined upward and is opposite to the air flotation back roller 221.

[0043] During the coating process, the unwinding mechanism 100 unwinds the roll material, and several rollers 500 support and guide the foil. The first coating die 212, tilted upwards, applies a wet film coating to the A side of the foil at the first back roller 211. After the wet film coating is applied, the foil tilts upwards and moves in an S-shape. Then, the second coating die 222, tilted upwards, applies a wet film coating to the B side of the foil at the air-float back roller 221. This allows standing workers to observe the A and B sides of the coated foil, facilitating timely intervention for coating defects. The foil with wet film coating on both sides is then inclined upwards through the air-float climbing component 230 into the combined drying oven 300. This provides non-contact support for the foil with wet film coating on both sides, preventing damage to the coating and reducing foil vibration. Then, the combined drying oven 300 dries the foil with wet film coating on both sides. Finally, the winding mechanism 400 winds up the dried foil.

[0044] It should be noted that the wrinkle-removing adjustment roller 240 can be a grooved threaded roller, an arc-shaped rubber roller, or a medium-high roller. Each end of the wrinkle-removing adjustment roller 240 is provided with a slide mechanism. The slide mechanism is used to change the position of the wrinkle-removing adjustment roller 240, thereby adjusting the wrap angle of the foil and ensuring uniform tension of the foil.

[0045] In some preferred embodiments, the lip tilt angle of the first coating die 212 is θ1, and the lip tilt angle of the second coating die 222 is θ2, wherein the tilt angle θ1 ranges from 0 to 60°, and the tilt angle θ2 ranges from 0 to 60°.

[0046] Reference Figure 7In some preferred embodiments, the air-bearing back roller 221 includes a metal tube 2211 and an outer roller 2212. The outer roller 2212 is sleeved on the outer periphery of the metal tube 2211. A cavity is provided axially at the center of the metal tube 2211. A plurality of gas channels 2213 are provided radially in the metal tube 2211. The gas channels 2213 are connected to the cavity. The outer roller 2212 is made of a porous material. The gas entering the cavity flows through the plurality of gas channels 2213 in the metal tube 2211 to the outer roller 2212 and flows out from the pores of the outer roller 2212, forming an air film on the surface of the outer roller 2212. Thus, non-contact conveying of foil can be achieved.

[0047] It should be noted that porous materials can be porous ceramic materials, porous graphite materials, or porous metal alloy materials. In this embodiment, there is no limitation on the specific materials used.

[0048] In some preferred embodiments, the first coating assembly 210 further includes a first translation module 213, which is used to drive the first coating die 212 to move closer to or away from the first back roller 211. This allows for precise control of the distance between the first coating die 212 and the first back roller 211, adjustment of the coating gap, and facilitates cleaning, maintenance, or replacement of the first coating die 212 or the first back roller 211.

[0049] In some preferred embodiments, the second coating assembly 220 further includes a second translation module 223, which is used to drive the second coating die 222 to approach or move away from the air-bearing back roller 221. This allows for precise control of the distance between the second coating die 222 and the air-bearing back roller 221, adjustment of the coating gap, and facilitates cleaning, maintenance, or replacement of the second coating die 222 or the air-bearing back roller 221.

[0050] Reference Figure 3 and Figure 4 Furthermore, the second coating assembly 220 also includes an angle adjustment module 224, which is used to adjust the tilt angle of the second coating die 222. The angle adjustment module 224 includes a base 2241, a rotating shaft 2242 rotatably connected to the base 2241, and a first motor 2243 for driving the rotating shaft 2242 to rotate. The base 2241 is disposed on the second translation module 223, and the second coating die 222 is fixed on the rotating shaft 2242.

[0051] It is understandable that the first motor 2243 drives the rotating shaft 2242 to rotate, and the rotating shaft 2242 drives the second coating die head 222 to rotate around the axis of the rotating shaft 2242, thereby facilitating the adjustment of the tilt angle of the second coating die head 222 and ensuring the stability and uniformity of the coating process.

[0052] Specifically, the first motor 2243 is a geared motor, which can provide stable speed and torque output, thereby ensuring the rotational accuracy of the second coating die 222 and accurately adjusting the tilt angle of the second coating die 222.

[0053] Reference Figure 3 and Figure 6 In some preferred embodiments, the second coating die 222 is a staggered lip die, which includes an upper lip 2221 and a lower lip 2222. The lower lip 2222 protrudes from the upper lip 2221 to form a stagger. During coating, the second translation module 223 drives the second coating die 222 to approach the air-bearing back roller 221, so that the lower lip 2222 of the second coating die 222 comes into contact with the foil. The coating is sprayed out through the gap between the upper lip 2221 and the lower lip 2222, thereby improving the uniform distribution of the coating on the foil surface, reducing bubbles and defects in the coating during the coating process, and improving the coating quality.

[0054] Specifically, the lower lip 2222 has a straight segment 2223 and an arc segment 2224. One end of the straight segment 2223 is tangent to one end of the arc segment 2224. When the straight segment 2223 comes into contact with the foil, it can ensure the flatness of the foil and prevent the foil from wrinkling. At the same time, the arc segment 2224 can guide the foil and prevent damage to the foil surface.

[0055] In some preferred embodiments, the air flotation climbing assembly 230 includes a plurality of air flotation plates 231, which are staggered vertically along the conveying direction of the foil. The staggered air flotation plates 231 can provide double-sided support for the foil, thereby reducing vibration during the foil conveying process, reducing foil wrinkles and offset, and improving the quality of the foil.

[0056] Furthermore, several air flotation plates 231 on the same side are arranged inclined upward along the conveying direction of the foil, thereby guiding the foil so that the coated foil can smoothly enter the combined drying oven 300.

[0057] Furthermore, at least one set of edge-flattening rollers 232 is provided between two adjacent air flotation plates 231. The edge-flattening rollers 232 are used to flatten the edge of the foil. Specifically, edge-flattening rollers 232 are provided on the side of the foil. The edge-flattening rollers 232 include two edge-flattening rollers corresponding to each other. The two edge-flattening rollers are used to clamp the blank area of ​​the foil edge and pull it outward, so that the wrinkled foil can be flattened and smoothly sent into the combined drying oven 300.

[0058] In some preferred embodiments, the combined drying oven 300 includes a chamber 310, a non-contact support assembly, a contact support assembly, and a plurality of drying components 340 disposed within the chamber 310. The non-contact support assembly includes a plurality of air-bearing rollers 320, and the contact support assembly includes a plurality of support rollers 330. The plurality of air-bearing rollers 320 and the plurality of support rollers 330 are arranged sequentially along the conveying direction of the foil. The plurality of air-bearing rollers 320 are arranged vertically and horizontally, and the plurality of drying components 340 are distributed vertically and horizontally between two adjacent air-bearing rollers 320 and two adjacent support rollers 330.

[0059] Furthermore, the ratio of the conveyor length of the non-contact support component to the conveyor length of the contact support component is 2.5 to 3.5 times, thereby greatly shortening the length of the combined oven 300.

[0060] Understandably, multiple air-bearing rollers 320 can provide double-sided non-contact support for the foil entering the housing 310, which can avoid physical friction on the uncured coating of the foil surface and prevent scratches on the foil surface coating. At the same time, multiple drying components 340 dry the foil on both sides. Then, multiple support rollers 330 provide contact support for the dried foil, which can effectively suppress the wrinkling and deformation of the foil. Meanwhile, multiple drying components 340 continue to dry the foil on both sides, thereby improving the support stability of the foil, ensuring uniform tension of the foil, avoiding wrinkles or vertical stripes on the foil, and improving the coating quality of the foil.

[0061] It should be noted that the drying component 340 can be a hot air nozzle, an infrared tube, or even a combination of both, to ensure complete drying of the surface-dried foil.

[0062] Among them, the wrap angle of the double-sided coated foil is >80° when passing through the air flotation roller 320, which is a large wrap angle. This is beneficial to spread the foil that produces vertical stripes to both sides and ensure the coating quality of the foil.

[0063] Let ΔL be the minimum shortening length of the combined oven 300, L1 be the horizontal length of the non-contact section of the oven, L2 be the horizontal length of the contact section of the oven, S1 be the conveyor length of the foil in the non-contact support assembly, a1 be the center distance between the two air-bearing rollers 320 in the horizontal direction, b1 be the height difference between the upper and lower air-bearing rollers 320, n be the number of air-bearing rollers 320, and R be the radius of the air-bearing rollers 320. The following relationships can be derived:

[0064] The drying length of the foil in the non-contact section is approximately S1 = (b1 + πR) * (n - 1), L1 ≈ a1 * (n - 1), and b1 ≥ 8R ~ 12R, a1 ≈ 2R ~ 5R. Therefore, S1 / L1 ≥ (b1 + πR) * (n - 1) / a1 * (n - 1) = 11.4 / 4 = 2.85. That is, the length of one L1 section of the non-contact oven is equal to the length of 2.83 sections of the contact oven. According to drying kinetics and experiments, the surface drying occurs at the beginning of the deceleration stage, which is approximately 3 / 4 of the drying length of the combined oven 300, i.e., S1 ≈ 3L2. Therefore, it can be deduced that the minimum shortening length ΔL of the combined oven 300 is 4L2 - (L1 + L2) = 4L2 - (1.05 + 1)L2 = 1.95L2.

[0065] Therefore, by arranging multiple air flotation rollers 320 arranged in an alternating manner, the length of the combined drying oven 300 can be greatly shortened under the same drying effect, thereby reducing the space occupancy rate of the combined drying oven 300.

[0066] Reference Figure 5 In some preferred embodiments, a correction mechanism 600 and a traction mechanism 700 are provided between the combined oven 300 and the winding mechanism 400. The correction mechanism 600 is used to adjust the position of the foil in the width direction, and the traction mechanism 700 is used to pull the foil to ensure the continuity and stability of the coating process.

[0067] Understandably, the 600 correction mechanism can accurately correct the offset of the foil during the conveying process, ensure the accuracy of the foil running path, guarantee the alignment of the foil edges when winding, and avoid problems such as wrinkles, mis-layering, or uneven tension of the roll.

[0068] Furthermore, the traction mechanism 700 includes a drive roller 710, a driven roller 720, a second motor (not shown in the figure), and a first cylinder 730. The second motor is used to drive the drive roller 710 to rotate, and the first cylinder 730 is used to drive the driven roller 720 to approach or move away from the drive roller 710 to press or release the foil.

[0069] Understandably, during the coating process, the second motor is started, which drives the active roller 710 to rotate. The first cylinder 730 drives the driven roller 720 to approach the active roller 710 and press the foil tightly. By increasing the friction between the foil and the active roller 710, the active roller 710 pulls the foil for uninterrupted transport, thereby improving the stability and continuity of the foil transport.

[0070] Furthermore, a tension adjustment mechanism 800 is provided between the correction mechanism 600 and the traction mechanism 700. The tension adjustment mechanism 800 includes a tension roller 810 and a second cylinder 820 for driving the tension roller 810 to move horizontally. This allows for precise adjustment of the foil belt tension, effectively preventing excessive stretching or loosening of the foil and ensuring the stability of the foil during the conveying process.

[0071] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A coating apparatus, characterized in that, The system includes an unwinding mechanism, a coating mechanism, a combined drying oven, a rewinding mechanism, and several guide rollers. The coating mechanism includes a first coating component, a wrinkle-removing adjusting roller, a second coating component, and an air flotation ramp component. The first coating component coats side A of the foil. The wrinkle-removing adjusting roller improves the wrinkling of the foil when it enters the second coating component and adjusts the wrap angle of the foil. The second coating component coats side B of the foil. The coated foil is conveyed to the combined drying oven via the air flotation ramp component. The combined drying oven includes a box body, a non-contact support component, a contact support component, and multiple drying components disposed within the box body. The non-contact support component includes multiple air flotation rollers, and the contact support component includes multiple support rollers. The multiple air flotation rollers and the multiple support rollers are arranged sequentially along the conveying direction of the foil. The multiple air flotation rollers are arranged vertically and alternately, and the multiple support rollers are arranged horizontally. The multiple drying components are distributed vertically and alternately between two adjacent air flotation rollers and two adjacent support rollers.

2. The coating apparatus according to claim 1, characterized in that, The ratio of the conveyor length of the non-contact support component to the conveyor length of the contact support component is 2.5 to 3.5 times.

3. The coating apparatus according to claim 1, characterized in that, The first coating assembly includes a first back roller and a first coating die, and the second coating assembly includes an air-bearing back roller and a second coating die. The foil is sequentially wound around the first back roller and the air-bearing back roller to form an S-shaped conveyor path. The lip of the first coating die is inclined upward and is opposite to the first back roller, and the lip of the second coating die is inclined upward and is opposite to the air-bearing back roller.

4. A coating apparatus according to claim 3, characterized in that, The lip tilt angle of the first coating die head is in the range of 0~60°, and the lip tilt angle of the second coating die head is in the range of 0~60°.

5. A coating apparatus according to claim 3, characterized in that, The air-bearing back roller includes a metal tube and an outer roller. The outer roller is sleeved on the outer periphery of the metal tube. A cavity is provided in the center of the metal tube along the axial direction. Multiple gas channels are provided in the metal tube along the radial direction. The gas channels are connected to the cavity. The outer roller is made of a porous material.

6. A coating apparatus according to claim 3, characterized in that, The first coating assembly further includes a first translation module, which is used to drive the first coating die head to approach or move away from the first back roller; the second coating assembly further includes a second translation module and an angle adjustment module, which is used to drive the second coating die head to approach or move away from the air-bearing back roller, and the angle adjustment module is used to adjust the tilt angle of the second coating die head.

7. A coating apparatus according to claim 6, characterized in that, The angle adjustment module includes a base, a rotating shaft rotatably connected to the base, and a first motor for driving the rotating shaft to rotate. The base is disposed on the second translation module, and the second coating die head is fixed on the rotating shaft.

8. A coating apparatus according to claim 3, characterized in that, The second coating die head is a staggered lip die head, which includes an upper lip and a lower lip. The lower lip protrudes from the upper lip to form a stagger, and the lower lip abuts against the foil material.

9. A coating apparatus according to claim 8, characterized in that, The lower lip has a straight segment and an arc segment, one end of the straight segment is tangent to one end of the arc segment, and the straight segment abuts against the foil.

10. A coating apparatus according to claim 1, characterized in that, The air flotation climbing assembly includes multiple air flotation plates, which are arranged alternately up and down along the conveying direction of the foil. Several air flotation plates on the same side are arranged inclined upward along the conveying direction of the foil. At least one set of edge-flattening wheels is provided between two adjacent air flotation plates. The edge-flattening wheels are used to flatten the edge of the foil.

11. A coating apparatus according to claim 1, characterized in that, A correction mechanism and a traction mechanism are provided between the combined drying oven and the winding mechanism. The correction mechanism is used to adjust the position of the foil in the width direction, and the traction mechanism is used to pull the foil.

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