Air floatation hot roller, drying oven and coating equipment

Abstract

The utility model relates to the technical field of lithium ion battery production, in particular to an air floatation hot roller, a drying oven and coating equipment. According to the air floatation hot roller, the temperature can be independently adjusted, and the drying temperature in a drying oven using the air floatation hot roller is controlled in a gradient change mode. Compared with a traditional oven, the length of the oven can be greatly shortened by achieving multi-section temperature gradient, the flow path of the pole pieces is shortened, and energy consumption is reduced; the drying temperature can be finely set according to the drying characteristic of the pole piece, the moisture content and the evaporation rate of the pole piece in the drying process are continuously changed, the temperature of each stage can be matched with the drying characteristic of the pole piece by setting the temperature gradient, energy waste caused by temperature mismatching is reduced, and therefore the drying efficiency and quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion battery production, in particular to an air-floating hot roll, an oven and a coating device. Background Art

[0002] In the current production process of lithium battery electrode coating, the wet coating method is mainly adopted. The wet coating process is to coat the positive or negative wet material on the surface of the current collector to form a wet electrode sheet, which needs to be dried for use. Among them, the main equipment for drying the electrode sheet is an oven, which plays a crucial role in the production efficiency of the electrode sheet and the quality of the coating.

[0003] At present, lithium battery electrode ovens are mainly divided into two types: single-sided coating ovens with over-roll support and air-floating ovens. The single-sided coating oven with over-roll support is characterized in that the wet coating is single-sided and coated above the current collector. This oven has the problems that the conveying surface is physically supported, the friction between the base material and the over-roll increases, the yield strength of the base material decreases, and the belt is easily broken, affecting the efficiency. At the same time, due to the single-sided contact between the current collector and the over-roll, the heat transfer on the contact surface is higher than that on the non-contact surface, resulting in uneven drying of both sides of the electrode sheet, easy formation of dark marks on the electrode sheet, leading to belt breakage during subsequent roll pressing and affecting the coating quality. The air-floating oven is characterized in that the wet coating is coated on both sides of the current collector. However, this oven has the problems that the electrode sheet shakes severely during the transfer process of the nozzle, which easily affects the leveling of the coating and causes surface density defects. At the same time, the shaking of the electrode sheet is also transmitted back to the coating head position, affecting the quality of the B-side coating.

[0004] At the same time, since all the air nozzles can only be at the same temperature, there are only n temperature values for n oven units (n ≤ 12), the temperature adjustment range is relatively monotonous, cannot be adjusted flexibly, the drying window is small, and it is easy to cause coating defects. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the utility model provides an air-floating hot roll, an oven and a drying device to solve the problem that the oven temperature is monotonous and cannot be adjusted flexibly during the drying process of the electrode sheet.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The first object of the utility model is to provide an air-floating hot roll, including:

[0008] A roll body with a cavity, an air flow channel communicated with the cavity is arranged on the roll body, an air outlet part covering the air flow channel is arranged outside the roll body, and a plurality of dense pores are arranged inside the air outlet part;

[0009] A heating part is provided inside the cavity, which can heat the gas inside the cavity. After the gas inside the cavity is heated, it is discharged through the pores of the air outlet part along the air flow channel.

[0010] Further, the inside of the air outlet part has a porous structure, and the pore diameter of the pores is in the sub-micron or micron range.

[0011] Further, the heating part is a heating tube, the heating tube is arranged along the extending direction of the cavity, and a plurality of heating fins are provided on the heating tube.

[0012] Further, a temperature measuring sensor is also included, which is used to detect the temperature inside the cavity.

[0013] The second object of the present utility model is to provide an oven for drying battery electrode sheets. For the above-mentioned air-floating hot roller, the oven has a drying channel for the electrode sheets to pass through. A plurality of air-floating hot rollers are arranged at equal intervals along both sides of the drying channel, and the temperature of the gas discharged from any one of the air-floating hot rollers can be independently adjusted.

[0014] Further, a displacement sensor is provided inside the oven, which is used to detect the distance between the electrode sheet and the air-floating hot roller.

[0015] Further, the oven also includes an air duct system, and the air duct system includes:

[0016] A first fan connected to the air-floating hot roller, which is used to introduce air into the air-floating hot roller; a second fan connected to the oven, which is used to discharge the air inside the oven to keep the air pressure inside the oven constant.

[0017] Further, a tape guiding assembly is provided at the entrance of the oven. The tape guiding assembly includes a tape guiding moving block, a pulling rod hinged to the tape guiding moving block, and a guiding groove that cooperates with the tape guiding moving block to slide. The guiding groove is arranged along the extending direction of the drying channel;

[0018] When guiding the tape, one end of the electrode sheet is fixed to the pulling rod, and the tape guiding moving block is driven to move in the guiding groove, so that the electrode sheet passes through the oven.

[0019] A lifting assembly is also included. The lifting assembly includes mounting plates arranged along both sides of the drying channel, a cylinder drivingly connected to the mounting plates, sliders fixedly connected to the mounting plates, and slide rails arranged inside the oven. The sliders are slidably engaged with the slide rails, and both ends of the air-floating hot roller are installed on the mounting plates through fasteners;

[0020] When guiding the tape, the cylinder drives the mounting plates on both sides of the drying channel to separate, so as to facilitate the passage of the tape guiding assembly.

[0021] The third object of the present utility model is to provide a coating device, including an oven as described above, and the drying channel of the oven is linear or "S"-shaped.

[0022] The beneficial effects of the present utility model are as follows:

[0023] The air-floating hot roller of the present utility model can independently adjust the temperature, so that the drying temperature in the oven using the air-floating hot roller is controlled in a gradient change. Compared with the traditional oven, the realization of multi-stage temperature gradient can greatly shorten the length of the oven, shorten the flow path of the electrode sheet, and reduce energy consumption; and the drying temperature can be finely set according to the drying characteristics of the electrode sheet. The moisture content and evaporation rate of the electrode sheet are constantly changing during the drying process. By setting the temperature gradient, the temperature at each stage can be matched with the drying characteristics of the electrode sheet, reducing the energy waste caused by temperature mismatch, thereby improving the drying efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present utility model will be further described below with reference to the drawings and embodiments.

[0025] Figure 1 It is a schematic diagram of the internal structure of the oven of the present utility model;

[0026] Figure 2 It is a schematic cross-sectional view of the air-floating hot roller of the present utility model;

[0027] Figure 3 It is a front view of the air-floating hot roller of the present utility model;

[0028] Figure 4 It is a schematic diagram of the internal structure of the air-floating hot roller of the present utility model;

[0029] Figure 5 It is a schematic diagram of the structure of the first embodiment of a coating device of the present utility model;

[0030] Figure 6 It is a schematic diagram of the first state of the tape-running assembly of the present utility model;

[0031] Figure 7 It is a schematic diagram of the second state of the tape-running assembly of the present utility model;

[0032] Figure 8 It is a schematic diagram of the third state of the tape-running assembly of the present utility model;

[0033] Figure 9 It is a side view schematic diagram of the tape-running assembly of the present utility model;

[0034] Figure 10 It is a schematic diagram of the lifting assembly of the present utility model;

[0035] Figure 11It is a schematic installation diagram of the air-floating hot roll of the present utility model;

[0036] Figure 12 It is a schematic structural diagram of the second embodiment of a coating device of the present utility model;

[0037] Figure 13 It is a schematic structural diagram of the third embodiment of a coating device of the present utility model.

[0038] Among them,

[0039] 10. Air-floating hot roll;

[0040] 101. Cavity; 102. Roll body; 103. Air flow channel; 104. Air outlet part; 105. Heating part; 1051. Heating sheet; 106. Temperature measuring sensor; 107. Ventilation groove;

[0041] 11. Displacement sensor;

[0042] 12. Air duct system; 121. First fan; 122. Second fan; 123. Return air cavity; 1231. First air cavity; 1232. Second air cavity; 124. Fresh air fan; 125. Exhaust fan; 126. Electric air brake;

[0043] 13. Tape guiding assembly; 131. Moving block; 132. Tape pulling rod; 133. Guide groove;

[0044] 14. Lifting assembly; 141. Mounting plate; 142. Cylinder; 143. Slide block; 144. Slide rail; 145. Fastener;

[0045] 15. Pressure gauge;

[0046] 21. A-side coating equipment; 22. B-side coating equipment; 23. Unwinding equipment; 24. Rewinding equipment. Detailed implementation manners

[0047] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present utility model in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the more optimal connection structure that can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present utility model can be combined interactively without conflicting with each other.

[0048] Existing ovens are generally composed of multiple oven monomers spliced together. The temperature inside a single oven monomer is the same. That is to say, there are only n temperature values for n oven monomers (generally n ≤ 12). The temperature adjustment range of the oven is relatively monotonous and not flexible enough. It is difficult to set a flexible temperature gradient according to the drying characteristics of the electrode sheet, and the drying effect is not ideal enough.

[0049] Referring to Figure 1 , an oven of the present utility model is an integral body, rather than composed of multiple oven monomers spliced together. It includes a pneumatic floating hot roll 10 capable of independently adjusting the temperature, so that the drying temperature gradient in the oven is consistent with the number of the pneumatic floating hot rolls 10 provided. It can be understood that a traditional single-section oven corresponds to one temperature gradient. If a drying environment with multiple temperature gradients is required, multiple sections of ovens need to cooperate. However, each pneumatic floating hot roll 10 of the oven of the present utility model corresponds to one temperature gradient, and multi-temperature-gradient control can be achieved within one oven. Compared with traditional ovens to achieve multiple temperature gradients, the length of the oven can be significantly shortened, the flow path of the electrode sheet can be shortened, and the energy consumption can be reduced. Moreover, the drying temperature can be finely set according to the drying characteristics of the electrode sheet. The moisture content and evaporation rate of the electrode sheet are constantly changing during the drying process. By setting a temperature gradient, the temperature at each stage can be matched with the drying characteristics of the electrode sheet, reducing energy waste caused by temperature mismatch, thereby improving the drying efficiency.

[0050] The box body has a closed structure on all sides and is interconnected in the middle to form an integral body. There are horizontally distributed openings at both ends of the box body for the electrode sheet to flow in and out. An oven is used for drying the battery electrode sheet. The oven has a drying channel for the electrode sheet to pass through. A number of pneumatic floating hot rolls 10 are arranged at equal intervals along both sides of the drying channel. Specifically, the pneumatic floating hot rolls 10 are arranged in an equally spaced and cross-distributed manner along both sides of the drying channel. The pneumatic floating hot rolls 10 that are staggered up and down can isolate the tension jitter of the wet electrode sheet without contacting and damaging the wet coating, which has a significant effect on improving the coating quality of the B side of the double-sided simultaneous coating. The electrode sheet moves and is dried under the support of the pneumatic floating hot rolls 10 on both sides in the drying channel. The temperature of the gas discharged from any one of the pneumatic floating hot rolls 10 can be independently adjusted. It can be understood that when the electrode sheet is in different drying stages, the corresponding temperature segments are matched and set. In the initial stage when the electrode sheet enters, a higher temperature is used to quickly evaporate the moisture on the surface of the electrode sheet, and in the middle and late stages, different temperature gradient environments are provided according to the drying characteristics of different electrode sheets, so as to better utilize energy, improve the drying efficiency and drying quality.

[0051] Referring to Figures 2 - 4, wherein, an air floating roller includes: a roller body 102 having a cavity 101, an air flow channel 103 communicating with the cavity 101 is provided on the roller body 102, and an air outlet part 104 covering the air flow channel 103 is provided outside the roller body 102, and the inside of the air outlet part 104 has a number of dense pores; a heating part 105 is provided in the cavity 101, which can heat the gas in the cavity 101, and the gas in the cavity 101 is discharged through the pores of the air outlet part 104 along the air flow channel 103 after being heated. It can be understood that after the gas is introduced into the cavity 101, the gas is heated by the heating part 105 and then discharged through the air outlet part 104. Since the inside of the air outlet part 104 has a number of dense pores, a gas film is formed on the surface of the air outlet part 104 by the heated gas, and this gas film can be used to support the electrode sheet and dry the electrode sheet.

[0052] Further, the air floating heat roller 10 is a cylindrical closed structure, including a metal roller barrel, and end caps fastened by bolts at both ends. One end is provided with an air inlet, and the other end is sealed with a joint of the heating part 105.

[0053] In some embodiments, referring to Figure 2 , the air flow channel 103 is a through hole connected to the cavity 101, and the gas in the cavity 101 enters the air outlet part 104 through this through hole and then is discharged; further, an air vent groove 107 is also provided on the surface of the roller body 102, and the air vent groove 107 is communicated with the through hole, and the air outlet part 104 covers the air vent groove 107 and the through hole. The air vent groove 107 can increase the contact area between the gas and the air outlet part 104, so that the air discharged from the air outlet part 104 is more uniform, providing a better support and drying effect. Specifically, the number of the air vent grooves 107 is multiple and arranged in parallel along the extending direction of the roller body 102 and connected to multiple through holes, that is, the air flows of multiple through holes converge in one air vent groove 107 and then enter the air outlet part 104 through the air vent groove 107. The air outlet part 104 and the roller body 102 are fixedly connected, preferably by bonding.

[0054] In some embodiments, the inside of the air outlet part 104 is a porous structure, and the aperture of the pores is sub-micron or micron-sized. Its material can be selected from porous carbon materials or porous metal sintered materials. The sub-micron and micron-sized pores can allow air to flow through at a sufficient speed, with uniform air outlet and large stiffness, forming a stable gas film, and the electrode sheet is supported by the gas film without shaking. Specifically, the roller body 102 is a cylindrical structure with a cylindrical surface, and the air outlet part 104 covers the surface of the roller body 102. The air outlet part 104 is along the circumferential direction of the roller body 102, generally 45° - 90°, and can also be made into 0 - 360° according to needs. It can be understood that the air outlet part 104 corresponds to a fan-shaped drying area.

[0055] In a specific embodiment, the area of the drying region is: S1 = θπD / 360L; if a slotted air nozzle is used, the drying area is: S2 = 2*aL.

[0056] Wherein, θ is the wrap angle of the air-floating material, with a length ranging from 45° to 90°; D is the diameter of the roller, taken as 100; a is the slotted width, commonly 4 mm;

[0057] S1 / S2 ≥ 4.9. It can be seen that generally, the drying efficiency of the air-floating hot roller 10 of the present invention is more than 4.9 times that of the slotted air nozzle.

[0058] In addition, according to the Stefan-Boltzmann law, the power density of thermal radiation is proportional to the fourth power of the temperature and inversely proportional to the square of the distance, that is, P ∝ T4 / d2. The distance between the conventional air nozzle and the pole piece is generally 7 mm. Due to the uniform effect of the porous material of the air outlet part 104 of the air-floating hot roller 10, an air film formed on the surface of the air outlet part 104 can support the pole piece, and the distance between the pole piece and the air outlet part 104 can be reduced to 1 mm without scraping. Therefore, the drying efficiency is increased by more than 49 times.

[0059] Thus, compared with the traditional air nozzle drying, the air-floating hot roller 10 of the present invention has a larger coverage area during drying, the distance between the pole piece and the air outlet part 104 is shortened to 1 mm, greatly improving the drying efficiency and providing the utilization rate of heat.

[0060] In some embodiments, referring to Figure 4 , the heating part 105 is a heating pipe, and the heating pipe is arranged along the extending direction of the cavity 101. The heating pipe is used to heat the air introduced into the cavity 101, and the heated air is discharged through the air outlet part 104. The temperature is adjusted by adjusting the input power of the heating pipe. Further, a plurality of heating fins 1051 are provided on the heating pipe. The setting of the heating fins 1051 can increase the contact area with the air, improve the heat exchange efficiency with the input air, and thus improve the heating efficiency. Further, a temperature measuring sensor 106 is further included to detect the temperature inside the cavity 101, and the input power of the heating pipe is adjusted according to the temperature detected in real time, so that the air-floating hot roller 10 always maintains within a predetermined temperature range.

[0061] In some embodiments, referring to Figure 1, the oven further includes an air duct system 12, and the air duct system 12 includes: a first fan 121 communicating with the air-floating hot roll 10 for introducing air into the air-floating hot roll 10; a second fan 122 communicating with the oven for exhausting the air in the oven to keep the air pressure in the oven constant. Further, the air duct system 12 further includes a return air chamber 123, a fresh air fan 124, and an exhaust fan 125. The fresh air fan 124 is used to inject air into the return air chamber 123, and the exhaust fan 125 is used to exhaust the excess air in the return air chamber 123. The return air chamber 123 is connected to the first fan 121 and the second fan 122. The first fan 121 is used to send the air in the return air chamber 123 into the interior of the air-floating hot roll 10, and the second fan 122 is used to send the gas in the oven into the return air chamber 123. The hot air entering the return air chamber 123 from the oven can continue to be sent into the interior of the air-floating hot roll 10 through the first fan 121, thereby improving the energy utilization rate and reducing waste. Further, as Figure 1 , the return air chamber 123 includes a first air chamber 1231 and a second air chamber 1232. A filter cotton is directly provided between the first air chamber 1231 and the second air chamber 1232. The air sent out by the second fan 122 enters the second air chamber 1232 after being filtered, enters the first air chamber 1231 after passing through the filter cotton, and the first fan 121 sends the air in the first air chamber 1231 into the air-floating hot roll 10. Further, an electric air brake 126 is further included for controlling the power of the second fan 122 to exhaust air.

[0062] In some embodiments, a displacement sensor 11 is provided in the oven for detecting the distance between the pole piece and the air-floating hot roll 10. When drying the pole piece, the distance between the pole piece and the air-floating hot roll 10 is fixed. If the displacement sensor 11 detects that the distance between the pole piece and the air-floating hot roll 10 changes, the input power of the first fan 121 is adjusted to adjust the detected distance between the pole piece and the air-floating hot roll 10.

[0063] In some embodiments, a pressure gauge 15 is provided in the oven for detecting the magnitude of the pressure in the oven.

[0064] Refer to Figures 5 - 9, in some embodiments, an end belt assembly 13 is provided at the inlet of the oven. The end belt assembly 13 includes an end belt moving block 131, a pulling belt rod 132 hinged to the end belt moving block 131, and a guiding groove 133 that slidably cooperates with the end belt moving block 131. The guiding groove 133 is arranged along the extending direction of the drying channel. When feeding the belt, one end of the pole piece is fixed to the pulling belt rod 132, and the end belt moving block 131 is driven to move within the guiding groove 133, so that the pole piece passes through the oven. It can be understood that the pulling belt rod 132 is hinged to the moving block 131. In the non-working state, the pulling belt rod 132 can be retracted around the hinge to prevent interference with the pole piece. Further, holes for fastening by the traction mechanism are provided at both ends of the moving block 131. During operation, the traction mechanism provides a driving force to pull the moving block 131 to move within the guiding groove 133. When the moving block 131 moves from one end of the guiding groove 133 to the other end, the belt feeding operation of the pole piece is completed.

[0065] Further, referring to Figure 10 , 11 , it further includes a lifting assembly 14. The lifting assembly 14 includes mounting plates 141 arranged on both sides along the drying channel, a cylinder 142 drivingly connected to the mounting plates 141, sliders 143 fixedly connected to the mounting plates 141, and slide rails 144 arranged inside the oven. The sliders 143 are slidably engaged with the slide rails 144. Both ends of the air floating thermal roller 10 are installed on the mounting plates 141 through fasteners 145. When feeding the belt, the cylinder 142 drives the mounting plates 141 on both sides of the drying channel to separate, so as to facilitate the passage of the end belt assembly 13. It can be understood that the cylinder 142 drives the mounting plates 141 on both sides of the drying channel to move upward and downward respectively. On the one hand, it facilitates belt feeding, and on the other hand, it facilitates cleaning of the roller surface. The sliders 143 cooperate with the slide rails 144 to ensure the stability of the mounting plates 141 during movement. Among them, the fasteners 145 are preferably fixed by clamps.

[0066] The present utility model provides a coating device. Referring to Figure 5 , 12 , 13, it includes the above-mentioned oven, wherein the drying channel of the oven is linear or "S"-shaped. Additionally, it further includes an A-side coating device 21, a B-side coating device 22, an unwinding device 23, and a winding device 24.

[0067] In some embodiments, the drying channel of the oven is linear. It can be understood that after the pole piece is coated on both A and B sides, it enters the oven from one end and can be wound by the winding device 24 after discharging from the other end of the oven. Conventionally, multiple oven units need to be spliced to complete the drying work. In this embodiment, using one oven can complete the drying work, and the drying efficiency and quality are higher.

[0068] In some embodiments, referring to Figure 12 ,13 , the drying channel of the oven is in an "S" shape. It can be understood that, compared with the linear shape, the "S" shape design can occupy less area and save a large amount of space. It should be noted that in a specific embodiment, the tape running mode of the electrode sheet in the "S" - shaped drying channel can be along the vertical direction or the horizontal direction, and specific selection should be made according to needs.

[0069] The present utility model provides a drying method, which uses the above - mentioned oven or coating device to dry the electrode sheet, including:

[0070] S1, transporting the battery electrode sheet into the oven along the drying channel;

[0071] S2, using a plurality of air - floating hot rollers 10 arranged at equal intervals on both sides of the drying channel to support the passing battery electrode sheet and adjusting the temperature of the gas output by the plurality of air - floating hot rollers 10 according to the drying characteristics of the battery electrode sheet, so as to perform multi - stage temperature drying on the battery electrode sheet.

[0072] It should be noted that according to the drying characteristics of the electrode sheet itself, a corresponding temperature gradient is set to set the most suitable temperature for each drying stage. It can more efficiently utilize energy, thereby improving the efficiency of the entire drying process.

[0073] Set the temperature value of the air - floating hot roller 10 as T, and the temperature value measured by the temperature sensor as t;

[0074] Set the distance between the air - floating hot roller 10 and the electrode sheet as H, and the distance measured by the displacement sensor 11 as h;

[0075] Set the chamber pressure in the oven as P0 < 0, and the pressure value measured by the pressure gauge 15 as P.

[0076] When t > T, reduce the input power of the temperature control device; when t < T, increase the input power of the temperature control device; when t = T, keep the input power of the temperature control device unchanged.

[0077] When h > H, reduce the input power of the first blower 121; when h < H, increase the input power of the first blower 121; when h = H, keep the input power of the first blower 121 unchanged.

[0078] When p ≥ 0, increase the angle of the electric air brake 126 and increase the input power of the second blower 122; when p < 0, keep the angle of the electric air brake 126 and the input power of the second blower 122 unchanged.

[0079] It can be understood that when drying the electrode sheet, it is necessary to control the distance between the electrode sheet and the air - floating hot roller 10, the air pressure in the oven, and the temperature of the air - floating hot roller 10. Under predetermined conditions, the oven of the present utility model is used to dry the electrode sheet.

[0080] The above is a specific description of the preferred embodiment of the present utility model. However, the creation of the present utility model is not limited to the described embodiment. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present utility model. These equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An air-floating hot roller, characterized in that, Comprising: A roller body with a cavity, an air flow channel communicating with the cavity is provided on the roller body, an air outlet part covering the air flow channel is provided outside the roller body, and a plurality of dense pores are provided inside the air outlet part; A heating part is provided in the cavity, which can heat the gas in the cavity, and the gas in the cavity is discharged through the pores of the air outlet part along the air flow channel after being heated.

2. The air-floating hot roll according to claim 1, wherein The inside of the air outlet part is a porous structure, and the aperture of the pores is of micron size.

3. The air-floating hot roll according to claim 1, wherein, The heating part is a heating tube, the heating tube is arranged along the extending direction of the cavity, and a plurality of heating fins are provided on the heating tube.

4. The air-floating hot roll according to claim 1, characterized in that, It further includes a temperature measuring sensor for detecting the temperature in the cavity.

5. An oven for drying battery electrode sheets, comprising the air-floating hot roll according to any one of claims 1-4, characterized in that, The oven has a drying channel for the electrode sheet to pass through, and a plurality of air-floating hot rollers are arranged at equal intervals along both sides of the drying channel, and the temperature of the gas discharged by any one of the air-floating hot rollers can be independently adjusted.

6. The oven according to claim 5, characterized in that, A displacement sensor is provided in the oven for detecting the distance between the electrode sheet and the air-floating hot roller.

7. The oven according to claim 5, characterized in that, The oven further includes an air duct system, and the air duct system includes: A first fan communicated with the air-floating hot roller for introducing air into the air-floating hot roller; a second fan communicated with the oven for discharging the air in the oven to keep the air pressure in the oven constant.

8. An oven according to any one of claims 5-7, characterized in that, A tape guiding assembly is provided at the inlet of the oven, and the tape guiding assembly includes a tape guiding moving block, a pulling tape rod hinged to the tape guiding moving block, and a guiding groove slidably cooperating with the tape guiding moving block, and the guiding groove is arranged along the extending direction of the drying channel; When guiding the tape, one end of the electrode sheet is fixed to the pulling tape rod, and the tape guiding moving block is driven to move in the guiding groove, so that the electrode sheet passes through the oven; It further includes a lifting assembly, and the lifting assembly includes mounting plates arranged along both sides of the drying channel, a cylinder drivingly connected to the mounting plates, sliders fixedly connected to the mounting plates, and slide rails arranged in the oven, the sliders are slidably matched with the slide rails, and both ends of the air-floating hot roller are installed on the mounting plates through fasteners; When guiding the tape, the cylinder drives the mounting plates on both sides of the drying channel to separate to facilitate the passage of the tape guiding assembly.

9. A coating device, comprising an oven according to any one of claims 5-8, characterized in that, The drying channel of the oven is in a straight line or an "S" shape.

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