A combined coating device for perovskite cells

Abstract

The invention relates to the technical field of drying devices, and discloses a combined coating device for perovskite cells, comprising a drying device, wherein a conveying structure is arranged in the drying device, and the drying device is divided into an infrared drying section, a hot air drying section and a low-pressure drying section in sequence along the conveying sequence of the conveying structure in the drying device, the low-pressure drying section and the infrared drying section and the hot air drying section are separated into two spaces by a partition, and only a pore is left for a metal foil to pass through, an infrared lamp is arranged above the infrared drying section, an air duct is arranged above and below the hot air drying section, the air duct is connected to the partition of the low-pressure drying section, a hot air blower for spraying hot air is arranged on one side of the air duct close to the conveying structure, the gas sprayed by the hot air blower is transported by the air duct, a part of the gas in the air duct is provided by an air pump outside the drying device, and the other part is extracted from the space where the low-pressure drying section is located, and the amount of gas extracted by the air duct in the space where the low-pressure drying section is located is greater than the amount of air entering.

Description

Technical Field

[0001] The invention relates to the technical field of drying devices, and in particular to a combined coating device for perovskite cells. Background Art

[0002] Perovskite battery is a new type of solar cell technology. Its core material is perovskite composite oxide. This material has excellent optical and electrical properties and can efficiently convert sunlight into electrical energy. The coating machine used to produce batteries refers to the equipment that evenly coats the stirred slurry (such as a mixture of active materials, binders, etc.) on metal foil (such as copper foil or aluminum foil, as the substrate of the electrode) and dries it to make positive and negative electrode sheets. Through the coating process, the battery coating machine can significantly improve the conductivity of the electrode, making the battery have better performance; at the same time, it can also ensure the electrode It can fit evenly and tightly on the diaphragm, thus avoiding the occurrence of short-circuit accidents and improving the safety of the battery. In addition, the coating process can also enhance the bonding strength between the electrode and the diaphragm, prevent the electrode from loosening and falling off during use, and thus increase the stability and service life of the battery. The battery coating machine generally works on the principle of roller coating. The specific process includes bringing the battery's pole piece and diaphragm onto the roller and fixing them on the roller by magnetic force or other means; then, use components such as a coating scraper to evenly coat the slurry on the pole piece and diaphragm; finally, dry it to solidify the coating layer.

[0003] Perovskite materials have unique physical and chemical properties, such as ion mobility, easy hydrolysis, and easy oxidation. These characteristics require that the design of the drying device must consider how to effectively prevent the material from decomposing, changing phases, or attenuating during the drying process. Due to the particularity of perovskite materials, the drying process needs to be completed as quickly as possible to reduce the exposure time of the material in the air. Therefore, the drying device may adopt a more efficient heating method (such as infrared hot air circulation) and optimized airflow design to achieve a fast and uniform drying effect. In the preparation process of perovskite cells, the uniformity of the film is crucial to the performance of the cell. Therefore, the drying device needs to ensure that the uniformity of the film is not affected during the drying process, which may require the drying device to have more precise control capabilities and more uniform airflow distribution. With the improvement of environmental awareness and the increase in energy costs, the environmental protection and energy saving of the drying device are becoming more and more important. For the coating machine of perovskite cells, the drying device may need to adopt a more environmentally friendly heating method and a more efficient energy utilization technology to reduce energy consumption and emissions during the production process. Summary of the invention

[0004] (I) Technical problems to be solved: In view of the shortcomings of the prior art, the present invention provides a combined coating device for perovskite cells, which has the advantages of fast and stable drying, avoiding oxidation, and saving energy, and solves the problem that perovskite materials are easily oxidized and decomposed during the drying process.

[0005] (II) Technical solution: In order to achieve the above-mentioned purpose of fast and stable drying, avoiding oxidation and saving energy, the present invention provides the following technical solution: A combined coating device for perovskite cells, comprising a drying device, wherein a conveying structure is provided in the drying device for conveying a metal foil coated with a slurry, wherein the drying device is divided into an infrared drying section, a hot air drying section and a low-pressure drying section in sequence along the conveying sequence of the conveying structure, wherein the low-pressure drying section is separated from the infrared drying section and the hot air drying section by a partition into two spaces, and only a gap is left for the metal foil to pass through, an infrared lamp is provided above the infrared drying section, an air duct is provided above and below the hot air drying section, and the air duct is connected to the partition of the low-pressure drying section, a hot air blower for ejecting hot air is provided on the side of the air duct close to the conveying structure, and the gas ejected by the hot air blower is transported by the air duct, a part of the gas in the air duct is provided by an air pump outside the drying device, and the other part of the gas is extracted from the space where the low-pressure drying section is located, and the amount of gas extracted by the air duct in the space where the low-pressure drying section is located is greater than the amount of air entering.

[0006] Preferably, the conveying structure consists of a guide roller and an auxiliary guide roller, the diameter of the auxiliary guide roller is smaller than the diameter of the guide roller, and the auxiliary guide roller is alternately distributed up and down with the guide roller, and the auxiliary guide roller is arranged above the guide roller.

[0007] Preferably, the guide roller and the auxiliary guide roller are provided with arc-shaped reflection plates for reflecting infrared rays on their sides.

[0008] Preferably, the cross-sectional area of ​​the inner pipe of the air duct at one end close to the low-pressure drying section is larger than the cross-sectional area of ​​the inner pipe at one end away from the low-pressure drying section.

[0009] Preferably, the hot air blower consists of an air outlet and a heating column. The hot air blower is provided with an air outlet on a side close to the conveying structure, and a cylindrical heating column is provided at the air outlet, and the heating column blocks and heats the ejected airflow.

[0010] Preferably, the heating temperatures of the heating columns in the different hot air blowers are different, and the temperature of the heating column in the hot air blower close to the infrared drying section is higher than the temperature of the heating column in the hot air blower close to the low-pressure drying section.

[0011] Preferably, the shell of the hot air blower at the air outlet is a transparent shell, so that the infrared light generated by the infrared lamp at the infrared drying section can be absorbed by the heating column.

[0012] Preferably, an exhaust fan is provided between the infrared drying section and the hot air drying section. The exhaust fan is arranged on the top of the drying device and can exhaust air inside the drying device.

[0013] Preferably, a winding condensation duct is provided inside the vacuum pump, and the condensation duct is inclined downward.

[0014] (III) Beneficial effects: Compared with the prior art, the present invention provides a combined coating device for perovskite cells, which has the following beneficial effects: 1. The combined coating device for perovskite cells, through the combined use of infrared drying section, hot air drying section and low-pressure drying section, realizes comprehensive control of the perovskite precursor solution from initial solvent removal to deep drying and then to rapid evaporation. This multi-stage and multi-mode drying strategy can significantly improve the drying efficiency and ensure the uniformity of the film during the drying process, reducing film unevenness or quality problems. Infrared drying quickly heats up, reducing film unevenness or quality problems that may be caused by the solvent staying at low temperature for a long time. Hot air drying avoids film quality problems caused by drying too fast or too slow by precisely controlling the temperature and wind speed, such as Cracking, falling off, etc. Low-pressure drying quickly evaporates the solvent at low temperature, reducing the damage that high temperature may cause to the perovskite film, while reducing the risk of the film reacting with oxygen and moisture in the air, protecting the purity and stability of the film. The film gradually densifies during the drying process, improving the density and crystallinity of the film, which is of great significance for improving the conversion efficiency and stability of perovskite batteries, reducing the performance degradation caused by solvent residue and film unevenness, and ensuring the high performance of the battery. The hot air drying section adopts a hot air circulation flow method, and part of the hot air comes from the extracted gas of the low-pressure drying section, which realizes heat recovery and reduces energy consumption. The low-pressure drying section accelerates solvent evaporation by reducing the air pressure, reducing the need for high-temperature drying and further saving energy.

[0015] 2. The combined coating device for perovskite cells effectively utilizes infrared energy that might otherwise be lost by setting up arc-shaped reflective plates. These reflective plates can reflect back infrared rays that could not directly irradiate the surface of the metal foil, so that more infrared rays can be irradiated onto the surface of the metal foil, thereby improving the utilization rate of infrared rays and the drying efficiency. Higher infrared drying efficiency means that more solvents can be removed in the same time, or the same drying effect can be achieved in a shorter time, thereby shortening the production cycle. Due to the improvement in infrared drying efficiency, the setting length of the infrared drying section can be shortened accordingly, which is very beneficial for equipment layout and space utilization, especially in a production environment with limited space. Shortening the length of the equipment not only reduces the space occupied by the equipment, but also reduces the manufacturing cost and transportation cost of the equipment. At the same time, the arc-shaped reflective plates can play a limiting role to a certain extent, avoiding obvious displacement of the metal foil during transportation.

[0016] 3. The combined coating device for perovskite cells gradually reduces the cross-sectional area of ​​the pipe inside the air duct in the direction of air flow movement. According to the Bernoulli principle, this design ensures that the air flow can maintain a relatively uniform speed when passing through the air duct. Since the hot air blower far away from the low-pressure drying section needs to overcome greater pipe resistance and energy loss, the air flow velocity can be increased by reducing the cross-sectional area of ​​the pipe, which can effectively compensate for these losses and ensure the uniformity of the air flow velocity in the entire air duct, which helps to achieve a more uniform drying effect and avoid the problem of uneven drying caused by uneven air flow velocity. By reasonably designing the cross-sectional area of ​​the air duct, the friction and other energy losses of the air flow in the pipe can be reduced. This design enables the hot air to maintain its temperature and speed more effectively during the transportation process, reducing the problem of hot air temperature drop and speed slowdown caused by energy loss. This not only helps to maintain the drying effect, but also reduces energy consumption and improves overall energy efficiency. Due to the reasonable design of the air duct, the air flow velocity is uniform and stable, which helps to enhance the stability and reliability of the entire drying system. The stable air flow velocity can reduce the uneven drying and film quality problems caused by air flow fluctuations, and also helps to extend the service life of the hot air blower and other related equipment.

[0017] 4. The combined coating device for perovskite cells is designed so that when the ejected airflow passes through, its two sides will periodically shed double-row line vortices with opposite rotation directions and regular arrangement, thereby forming a Karman vortex street. The movement of the vortex not only increases the contact time between the airflow and the heating column, so that the heat can be more effectively transferred to the airflow, but also increases the contact time between the airflow and the metal foil, so that the vortex carrying heat can better heat and dry the metal foil. This design significantly improves the heat transfer efficiency and helps to achieve a more uniform drying effect. The movement of the vortex is softer than the linear movement of the airflow. This soft airflow movement mode helps to reduce the unevenness of the slurry on the surface of the metal foil due to the impact of the airflow during the hot air drying process, which is very important for maintaining the slurry. The uniformity of the material and improving the quality of the film are crucial. The heating temperatures of the heating columns in different hot air blowers are different. The temperature of the heating columns in the hot air blowers close to the infrared drying section is higher to provide a larger temperature difference and higher heat transfer efficiency; while the temperature of the heating columns in the hot air blowers close to the low-pressure drying section is relatively low to avoid problems such as cracking of the metal foil due to overheating. This temperature gradient design helps to achieve more precise temperature control and ensure the safety and effectiveness of the drying process. The shell of the hot air blower at the air outlet is a transparent shell. This design enables the infrared light generated by the infrared lamp in the infrared drying section to be absorbed by the heating column. In this way, the infrared rays that cannot be absorbed by the metal foil are effectively utilized, reducing the energy consumed by the heating column. This energy-saving design helps to reduce production costs and improve overall energy efficiency.

[0018] 5. The combined coating device for perovskite cells can effectively extract the solvent after evaporation of the slurry on the metal foil from the inside of the drying device through the setting of the vacuum fan. When these solvents pass through the condensation pipe inside the vacuum fan, the downward inclination of the pipe is conducive to the condensation and collection of the solvent. The recovered solvent can be reused in the production process, thereby reducing production costs and reducing resource waste. It is in line with the concept of sustainable development. By recycling and reusing solvents, the demand for new solvents can be reduced, thereby reducing energy consumption. In addition, the design of the condensation pipe also helps to improve condensation efficiency and reduce energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of the guide roller in the present invention.

[0021] Figure 3 It is a schematic diagram of the auxiliary guide roller in the present invention.

[0022] Figure 4 It is a schematic diagram of infrared drying in the present invention.

[0023] Figure 5 It is a schematic diagram of the infrared irradiation heating column in the present invention.

[0024] Figure 6 Schematic diagram of air flow of the hot air blower in the present invention.

[0025] Figure 7 Schematic diagram of air flow in the drying device of the present invention.

[0026] Figure 8 The condenser tube of the present invention is shown in FIG. Figure 1 .

[0027] Fig. 9 The condenser tube of the present invention is shown in FIG. Figure 2 .

[0028] In the figure: 1. drying device; 11. infrared drying section; 12. hot air drying section; 13. low-pressure drying section; 101. guide roller; 102. auxiliary guide roller; 103. arc-shaped reflective plate; 111. infrared lamp; 121. exhaust fan; 122. air duct; 123. hot air blower; 1211. condensation duct; 1231. air outlet; 1232. heating column. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 , a combined coating device for perovskite cells, comprising a drying device 1, wherein a conveying structure is provided in the drying device 1 for conveying a metal foil coated with a slurry, wherein the drying device 1 is divided into an infrared drying section 11, a hot air drying section 12 and a low-pressure drying section 13 in sequence along the conveying sequence of the conveying structure, wherein the low-pressure drying section 13 is separated from the infrared drying section 11 and the hot air drying section 12 by a partition into two spaces, and only a pore is left for the metal foil to pass through, an infrared lamp 111 is provided above the infrared drying section 11, and the hot air drying section 12 is provided with a plurality of hot air drying sections. An air duct 122 is provided at the upper and lower parts respectively, and the air duct 122 is connected to the partition of the low-pressure drying section 13. A hot air blower 123 for spraying hot air is provided on the side of the air duct 122 close to the conveying structure. The gas sprayed by the hot air blower 123 is transported by the air duct 122. A part of the gas in the air duct 122 is provided by an air pump outside the drying device 1, and the other part of the gas is extracted from the space where the low-pressure drying section 13 is located. The amount of gas extracted by the air duct 122 in the space where the low-pressure drying section 13 is located is greater than the amount of air entering. The air pressure of the low-pressure drying section 13 is reduced by exhausting air through the air duct 122.

[0031] The metal foil with slurry is transported to the infrared drying section 11 by the conveying structure and is infrared dried by the infrared lamp 111. Infrared drying utilizes the thermal radiation characteristics of infrared rays to quickly heat the perovskite precursor solution coated on the substrate. This rapid temperature rise helps to reduce the uneven film or quality problems that may be caused by the solvent staying at low temperature for a long time. Infrared drying initially removes part of the solvent, creating better conditions for subsequent hot air drying and low-pressure drying, reducing the risk of uneven solvent volatilization or film damage that may occur in these stages. After the infrared drying is completed, the metal foil is transported to the hot air drying section and is further dried by the hot air sprayed by the hot air blower 123. On the basis of infrared drying, hot air drying further penetrates into the interior of the film through the circulation of hot air to remove residual solvent. This method can better ensure the overall drying uniformity of the film than simple infrared radiation. Hot air drying can accurately control the drying process by adjusting the temperature and wind speed to adapt to perovskite films of different thicknesses and compositions, which helps to reduce the risk of drying too fast or too fast. The film quality problem caused by slow drying is solved. With the further removal of the solvent, the film gradually densifies, providing a better foundation for the subsequent low-pressure drying and the final battery performance. The metal foil is then transported to the low-pressure drying section 13. The low-pressure drying section 13 is an independent space and a low-pressure environment, which effectively reduces the boiling point of the solvent, so that the solvent can evaporate quickly at a lower temperature. At the same time, the metal foil has just undergone hot air drying and has a certain temperature, so that the solvent can evaporate quickly without heating again, which helps to reduce the damage that high temperature may cause to the perovskite film. At the same time, there is less air in the low-pressure environment, which effectively reduces the reaction of the perovskite film with oxygen, moisture, etc. in the air, thereby reducing the risk of oxidation and pollution, which is crucial to maintaining the purity and stability of the perovskite film and improving the density and crystallinity of the film, which is of great significance to improving the conversion efficiency and stability of the perovskite battery. At the same time, the heat lost by the metal foil in the low-pressure drying section 13 can be recycled with the air duct 122, greatly reducing energy consumption.

[0032] See also Figure 2-Figure 4 The conveying structure is composed of a guide roller 101 and an auxiliary guide roller 102. The diameter of the auxiliary guide roller 102 is smaller than that of the guide roller 101, and the auxiliary guide roller 102 is alternately distributed up and down with the guide roller 101. The auxiliary guide roller 102 is arranged above the guide roller 101. The sides of the guide roller 101 and the auxiliary guide roller 102 are provided with arc-shaped reflection plates 103 for reflecting infrared rays. The arc-shaped reflection plates 103 can reflect a part of the infrared rays that cannot be irradiated to the surface of the metal foil onto it, thereby increasing the efficiency of infrared drying, effectively shortening the setting length of the infrared drying section 11, reducing the space occupied by the equipment, and reducing the cost.

[0033] The internal pipe cross-sectional area of ​​the air duct 122 at the end close to the low-pressure drying section 13 is larger than the internal pipe cross-sectional area at the end away from the low-pressure drying section 13. This is because the airflow in the air duct 122 moves from the end close to the low-pressure drying section 13 to the end away from the low-pressure drying section 13. Since the pipe diameter gradually decreases in the direction of airflow movement, according to Bernoulli's principle (in an ideal fluid, the sum of pressure energy, potential energy and kinetic energy remains unchanged at rest), when the pipe cross-sectional area decreases, in order to keep the mass flow rate (the mass of fluid passing through the pipe cross-section per unit time) unchanged, the airflow velocity must be increased, so that under the premise of friction and other energy losses of the airflow passing through the pipe, the hot air blower 123 away from the low-pressure drying section 13 can still ensure sufficient airflow velocity, thereby avoiding the different airflow velocities of the hot air blowers 123 at different positions, which affects the drying process.

[0034] See also Figure 6 The hot air blower 123 is composed of an air outlet 1231 and a heating column 1232. The hot air blower 123 is provided with an air outlet 1231 on a side close to the conveying structure. A cylindrical heating column 1232 is provided at the air outlet 1231. The heating column 1232 blocks and heats the ejected airflow. When the airflow passes through the heating column 1232, both sides of the heating column 1232 will periodically shed double-row line vortices with opposite rotation directions and regular arrangement. After the nonlinear action of the line vortex, a Karman vortex street is formed. The vortex street is composed of multiple vortices. The movement of the vortex increases the contact time between the airflow and the heating column 1232, so that the heat on the heating column 1232 can be effectively transferred to the airflow. At the same time, the contact time between the airflow and the metal foil is also increased, so that the vortex carrying heat can better heat and dry the metal foil. Moreover, the movement of the vortex is softer than the linear movement of the airflow, so that in the hot air drying process, the slurry on the surface of the metal foil is prevented from being uneven during the drying process.

[0035] See also Figure 5-Figure 6 The heating temperatures of the heating columns 1232 in the different hot air blowers 123 are different. The temperature of the heating column 1232 in the hot air blower 123 close to the infrared drying section 11 is higher than the temperature of the heating column 1232 in the hot air blower 123 close to the low-pressure drying section 13, so that the temperature of the air flow initially in contact with the metal foil is higher, with a larger temperature difference, higher heat transfer efficiency, and a relatively low subsequent hot air temperature, which prevents the metal foil from overheating and causing cracking. The shell of the hot air blower 123 at the air outlet 1231 is a transparent shell, so that the infrared light generated by the infrared lamp 111 at the infrared drying section 11 can be absorbed by the heating column 1232, and the infrared light that cannot be absorbed by the metal foil is utilized, thereby reducing the energy consumed by the heating column 1232.

[0036] See also Figure 7-Figure 8An exhaust fan 121 is provided between the infrared drying section 11 and the hot air drying section 12. The exhaust fan 121 is arranged on the top of the drying device 1 and can exhaust the inside of the drying device 1. A winding condensation pipe 1211 is provided inside the exhaust fan 121, and the condensation pipe 1211 is inclined downward, so that after the solvent in the slurry on the metal foil evaporates, it is collected by the exhaust fan 121, condensed in the condensation pipe 1211, and recycled for reuse.

[0037] Working principle: The drying device 1 is divided into an infrared drying section 11, a hot air drying section 12 and a low-pressure drying section 13 in sequence. The low-pressure drying section 13 is separated from the infrared drying section 11 and the hot air drying section 12 by a partition into two spaces, and only a gap is left for the metal foil to pass through. An infrared lamp 111 is arranged above the infrared drying section 11, and an air duct 122 is arranged above and below the hot air drying section 12, and the air duct 122 is connected to the partition of the low-pressure drying section 13. A hot air blower 123 that sprays hot air is arranged on the side of the air duct 122 close to the conveying structure. The gas sprayed by the hot air blower 123 is transported by the air duct 122. A part of the gas in the air duct 122 is provided by an air pump outside the drying device 1, and the other part is provided by an air pump from the low-pressure drying section 1 3 is extracted, the amount of gas extracted by the air duct 122 in the low-pressure drying section 13 is greater than the amount of air entering, and the air pressure of the low-pressure drying section 13 is reduced by the extraction of air through the air duct 122. The metal foil with the slurry is transported to the infrared drying section 11 by the conveying structure and infrared dried by the infrared lamp 111. The infrared drying utilizes the thermal radiation characteristics of infrared rays to quickly heat the perovskite precursor solution coated on the substrate. This rapid heating helps to reduce the uneven film or quality problems that may be caused by the solvent staying at low temperature for a long time. The infrared drying preliminarily removes part of the solvent, creating better conditions for the subsequent hot air drying and low-pressure drying, and reducing the uneven solvent volatilization or film damage that may occur in these stages. Risk, infrared drying is completed, the metal foil is transported to the hot air drying section, and is further dried by the hot air sprayed by the hot air blower 123. On the basis of infrared drying, hot air drying further penetrates into the film through the circulation of hot air to remove residual solvent. This method can better ensure the uniformity of the overall drying of the film than simple infrared radiation. Hot air drying can accurately control the drying process by adjusting the temperature and wind speed to adapt to perovskite films of different thicknesses and compositions, which helps to reduce film quality problems caused by drying too fast or too slow. With the further removal of the solvent, the film gradually densifies, providing a better foundation for subsequent low-pressure drying and ultimate battery performance. The metal foil is then transported to the low The high-pressure drying section 13 is an independent space and a low-pressure environment, which effectively reduces the boiling point of the solvent, so that the solvent can evaporate quickly at a lower temperature. At the same time, the metal foil has just undergone hot air drying and has a certain temperature itself, so that the solvent can evaporate quickly without heating again, which helps to reduce the damage that high temperature may cause to the perovskite film. At the same time, there is less air in the low-pressure environment, which effectively reduces the reaction of the perovskite film with oxygen, moisture, etc. in the air, thereby reducing the risk of oxidation and contamination, which is crucial to maintaining the purity and stability of the perovskite film and improving the density and crystallinity of the film, which is of great significance to improving the conversion efficiency and stability of perovskite batteries.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined coating device for perovskite cells, comprising a drying device (1), wherein a conveying structure is provided in the drying device (1) for conveying a metal foil coated with a slurry, characterized in that: The drying device (1) is divided into an infrared drying section (11), a hot air drying section (12) and a low-pressure drying section (13) in sequence along the transport sequence of the conveying structure. The low-pressure drying section (13) is separated from the infrared drying section (11) and the hot air drying section (12) by a partition plate into two spaces, and only a pore is left for the metal foil to pass through. An infrared lamp (111) is provided above the infrared drying section (11), and an air duct (122) is provided above and below the hot air drying section (12). ), and the air duct (122) is connected to the partition of the low-pressure drying section (13); a hot air blower (123) for ejecting hot air is provided on the side of the air duct (122) close to the conveying structure; the gas ejected by the hot air blower (123) is transported by the air duct (122); part of the gas in the air duct (122) is provided by an air pump outside the drying device (1); the other part of the gas is extracted from the space where the low-pressure drying section (13) is located; the amount of gas extracted by the air duct (122) in the space where the low-pressure drying section (13) is located is greater than the amount of air entering the space. The cross-sectional area of ​​the internal pipe of the air duct (122) at one end close to the low-pressure drying section (13) is larger than the cross-sectional area of ​​the internal pipe at one end away from the low-pressure drying section (13); the hot air blower (123) is composed of an air outlet (1231) and a heating column (1232); the hot air blower (123) is provided with an air outlet (1231) on a side close to the conveying structure; a cylindrical heating column (1232) is provided at the air outlet (1231); the heating column (1232) blocks and heats the ejected airflow; The heating temperatures of the heating columns (1232) in different hot air blowers (123) are different. The temperature of the heating column (1232) in the hot air blower (123) close to the infrared drying section (11) is higher than the temperature of the heating column (1232) in the hot air blower (123) close to the low-pressure drying section (13). The shell of the hot air blower (123) at the air outlet (1231) is a transparent shell, so that the infrared light generated by the infrared lamp (111) at the infrared drying section (11) can be absorbed by the heating column (1232).

2. A combined coating device for perovskite cells according to claim 1, characterized in that: The conveying structure is composed of a guide roller (101) and an auxiliary guide roller (102); the diameter of the auxiliary guide roller (102) is smaller than the diameter of the guide roller (101), and the auxiliary guide roller (102) and the guide roller (101) are alternately arranged up and down; the auxiliary guide roller (102) is arranged above the guide roller (101).

3. A combined coating device for perovskite cells according to claim 2, characterized in that: The guide roller (101) and the auxiliary guide roller (102) are provided with arc-shaped reflection plates (103) for reflecting infrared rays on their sides.

4. A combined coating device for perovskite cells according to claim 1, characterized in that: An exhaust fan (121) is provided between the infrared drying section (11) and the hot air drying section (12); the exhaust fan (121) is arranged on the top of the drying device (1) and is capable of exhausting air inside the drying device (1).

5. A combined coating device for perovskite cells according to claim 4, characterized in that: A winding condensation pipe (1211) is provided inside the air extractor (121), and the condensation pipe (1211) is in a downwardly inclined shape.

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