Drying device and coating equipment

Abstract

The utility model discloses a drying device and coating equipment. The drying device comprises an air inlet pipeline, a drying channel and an exhaust pipeline which are sequentially communicated in the airflow flowing direction, the drying channel can contain a to-be-dried part, a heating module is arranged in the air inlet pipeline, and the heating module is configured to heat airflow flowing through the heating module in the air inlet pipeline. In the airflow flowing direction, at least part of the pipe section, located on the upstream side of the heating module, of the air inlet pipeline is connected with the exhaust pipeline. Therefore, fresh air in the section, located on the upstream side of the heating module, of the air inlet pipeline can absorb heat of return air flow in the air exhaust pipeline in advance and then flow through the heating module to be heated, the heating efficiency of the fresh air is improved, heat in exhausted air flow can be recycled, energy waste is reduced, and the energy consumption is reduced. The heat utilization rate of the drying device is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of battery production equipment, and in particular, relates to a drying device and a coating device. Background Art

[0002] When manufacturing batteries, according to process requirements, the wet electrode sheets after coating need to be dried in an oven to produce electrode sheets with specified thickness and consistent coating uniformity. Therefore, the drying process plays a vital role in the production of battery electrodes.

[0003] At present, the heat dissipation phenomenon in the drying process of the electrode is serious, resulting in high energy consumption of the oven. Utility Model Content

[0004] The embodiments of the present application provide a drying device and a coating device to improve the heat utilization rate of the drying device and reduce its energy consumption.

[0005] According to a first aspect of the present application, the present application provides a drying device. The drying device comprises an air inlet duct, a drying channel and an exhaust duct which are sequentially connected along the air flow direction, the drying channel can accommodate items to be dried, a heating module is provided in the air inlet duct, and the heating module is configured to heat the air flow in the air inlet duct passing through the heating module; in the air flow direction, at least a portion of the air inlet duct on the upstream side of the heating module is connected to the exhaust duct.

[0006] The embodiment of the present application connects at least a portion of the pipe section of the air inlet duct on the upstream side of the heating module to the exhaust duct, so that the fresh air in the section of the air inlet duct on the upstream side of the heating module absorbs the heat of the return air flow in the exhaust duct in advance, and then flows through the heating module to be heated. This not only improves the heating efficiency of the fresh air, but also can recycle the heat in the exhaust air flow, thereby reducing energy waste, improving the heat utilization rate of the drying device and reducing its energy consumption.

[0007] Optionally, the air inlet duct includes a first pipe section and a second pipe section, the first pipe section and the second pipe section are connected through a connecting pipe section, the heating module is arranged in the connecting pipe section, and in the air flow direction, the first pipe section is located on the upstream side of the second pipe section; the first pipe section and the exhaust duct are radially stacked. The pipe wall of the first pipe section is in direct contact with the pipe wall of the exhaust duct, and the contact area is large. The heat of the airflow in the exhaust duct can be transferred to the airflow of the fresh air duct through the pipe wall of the exhaust duct and the pipe wall of the first pipe section. The heat transfer efficiency is relatively high, and the pipe structure layout of the drying device can be made more compact, reducing the occupied space.

[0008] Optionally, the second pipe segment is radially stacked with the first pipe segment. The pipe wall of the first pipe segment is in direct contact with the pipe wall of the second pipe segment, which can reduce the area of ​​the second pipe segment exposed to the outside, thereby reducing the heat loss of the second pipe segment, and can further improve the compactness of the pipeline structure layout and simplify the pipeline structure.

[0009] Optionally, the second pipe section and the exhaust duct are located on opposite sides of the first pipe section in the radial direction. Thus, under the premise of ensuring that the second pipe section and the exhaust duct are radially stacked with the first pipe section, the distance between the second pipe section and the exhaust duct is increased as much as possible, the possibility of heat transfer between the second pipe section and the exhaust duct is reduced, and the influence of the exhaust duct on the air supply temperature of the second pipe section is reduced.

[0010] Optionally, the air inlet duct includes a second pipe segment and a plurality of first pipe segments. In the airflow direction, the plurality of first pipe segments are arranged in parallel on the upstream side of the second pipe segment, and the heating module is located on the downstream side of the plurality of first pipe segments and the upstream side of the second pipe segment; each first pipe segment is radially stacked with the exhaust duct. Thus, the airflow in each first pipe segment can exchange heat with the airflow in the exhaust duct, thereby improving the recovery rate of the heat of the airflow in the exhaust duct and further reducing the heat loss of the drying device. On this basis, the extension length of the exhaust duct and the first pipe segment can also be appropriately shortened to simplify the structure of the drying device and improve the rationality of its structural layout.

[0011] Optionally, the air inlet duct includes a first pipe section and a second pipe section, the first pipe section and the second pipe section are connected through a connecting pipe section, the heating module is arranged in the connecting pipe section, and in the airflow direction, the first pipe section is located on the upstream side of the second pipe section; the first pipe section and the exhaust duct are sleeved. Thus, the contact surface between the first pipe section and the exhaust duct is an annular surface, which increases the contact area between the first pipe section and the exhaust duct and improves the heat exchange effect between the first pipe section and the exhaust duct.

[0012] Optionally, the first pipe section and the adjacent pipe wall of the exhaust duct are stacked to form a partition layer, and the thickness of the partition layer is 0.5 mm to 5 mm. Thus, the heat exchange effect between the first pipe section and the exhaust duct is improved as much as possible while ensuring the structural strength.

[0013] Optionally, the drying channel is located radially outside at least part of the air inlet duct, an air outlet is provided on the wall of the air inlet duct facing the drying channel, the air inlet duct is connected to the drying channel through the air outlet, an air outlet is provided at the air outlet, and the air outlet extends from the wall of the air inlet duct toward the drying channel; the drying device also includes a guide member, which is provided between the outside of the air outlet and the wall of the air inlet duct and covers the connection position between the air outlet and the wall of the air inlet duct. In this way, the airflow flowing out of the air outlet 114 can be effectively blown toward the object to be dried, and the generation of eddies and vortices can be avoided as much as possible, the condensation of solvents in the airflow is reduced, and the drying effect is improved.

[0014] Optionally, an air outlet duct is defined inside the air outlet nozzle, and both ends of the air outlet duct are respectively connected to the air outlet and the drying channel; the guide member is bent and extended along the extension direction of the drying channel from one end of the air outlet duct connected to the drying channel to the pipe wall of the air inlet duct. The bent and extended guide member can guide the airflow passing through its surface, buffer the change of the airflow direction, and thus reduce the resistance to the airflow.

[0015] Optionally, the wall of the air inlet duct includes a first wall surface and a second wall surface, the first wall surface and the second wall surface are arranged oppositely and at intervals, the drying channel is formed between the first wall surface and the second wall surface, and the first wall surface is provided with an air outlet; the exhaust duct is connected to the drying channel through a return air outlet, and a return air nozzle is provided at the return air outlet, and the return air nozzle extends from the first wall surface into the drying channel, the air outlet nozzle and the return air nozzle are adjacent to and arranged at intervals along the extension direction of the drying channel, and the guide member is arranged between the air outlet nozzle and the return air nozzle, and covers the connection position between the return air nozzle and the first wall surface. In this way, the channel between the air outlet nozzle and the return air nozzle can be made into an arc shape, reducing dead angles such as corners and corners, effectively reducing the generation of vortexes, swirls and other phenomena, reducing the solvent condensation phenomenon in the airflow, and improving the drying effect.

[0016] Optionally, there are multiple air outlets and multiple return air outlets, and the multiple air outlets and multiple return air outlets are alternately and spacedly distributed along the extension direction of the drying channel. As a result, in the extension direction of the drying channel, the distribution of the air outlets and the distribution of the return air outlets are more uniform, which is conducive to uniform drying of the long pieces to be dried, thereby improving the drying effect. In addition, the alternating distribution of the air outlets and the return air outlets is conducive to the rapid outflow of the return airflow passing through the pieces to be dried, which is conducive to increasing the proportion of effective drying airflow in the drying channel and improving the drying efficiency.

[0017] Optionally, the second wall is provided with air outlets, and the air outlets provided on the first wall and the air outlets provided on the second wall are staggered along the extension direction of the drying channel. The airflow blown out from the air outlets on the second wall can be blown to the dried object from another direction, and the heat in the airflow can directly act on the drying surface of the dried object, and can also act on the substrate to act on the drying surface of the dried object in a transfer manner, thereby improving the drying efficiency.

[0018] Optionally, the drying device further comprises a recovery module, the recovery module is configured to recover the solvent in the gas flowing through it, the recovery module is connected to the exhaust duct through a first recovery pipeline, and is connected to the air inlet duct through a second recovery pipeline, and at least part of the pipe sections of the first recovery pipeline and the second recovery pipeline are thermally connected. The airflow in the second recovery pipeline can absorb the heat of the airflow in the first recovery pipeline, and heat the airflow flowing into the air inlet duct in advance, which further improves the heat utilization rate, reduces the heat waste, and reduces the energy consumption of the drying device.

[0019] According to the second aspect of the present application, the present application also provides a coating device, which includes the drying device provided in any embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of a drying device provided in one embodiment of the present application.

[0022] Figure 2 yes Figure 1 Schematic diagram of air flow direction of the drying device shown.

[0023] Figure 3 It is a schematic structural diagram of a first pipe section, a second pipe section and an exhaust passage of a drying device provided in one embodiment of the present application.

[0024] Figure 4 It is a schematic structural diagram of a first pipe section and an exhaust passage of a drying device provided in another embodiment of the present application.

[0025] Figure 5 This is a schematic structural diagram of a first pipe section and an exhaust passage of a drying device provided in yet another embodiment of the present application.

[0026] Figure 6 It is a schematic structural block diagram of a coating device provided in one embodiment of the present application.

[0027] The reference numerals are as follows:

[0028] Coating equipment 100, drying device 10, air inlet duct 11, first pipe section 111, second pipe section 112, connecting pipe section 113, air outlet 114, pipe wall 115, first wall surface 1151, second wall surface 1152, drying channel 12, exhaust duct 13, return air outlet 131, heating module 14, air outlet nozzle 15, air outlet duct 151, guide member 16, return air nozzle 17, module 18, first recovery pipeline 191, second recovery pipeline 192. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, m and / or n can represent: m exists alone, m and n exist at the same time, and n exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0035] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0038] With the development of science and technology, electronic products are increasingly entering all aspects of people's lives, and the normal use of electronic products is inseparable from batteries. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a casing for encapsulating one or more battery cells or multiple battery modules. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0039] The battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.

[0040] A battery cell generally includes a housing, an electrode assembly and an electrolyte, and the housing is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab.

[0041] During the production of battery cells, a coating process is required. According to the process requirements, the wet electrode after coating needs to be dried in an oven. Most existing oven pipes are in direct contact with the environment, resulting in a large amount of heat being lost to the environment through the pipes. Even if some oven pipes are equipped with insulation materials, the heat dissipation phenomenon is still very serious, and the insulation materials will make the oven pipes larger and the pipe structure more complicated.

[0042] Based on the above considerations, in order to solve the problems of large heat dissipation, low drying efficiency, and high energy consumption of the drying device, the inventor has designed a drying device after in-depth research, which can dry the parts to be dried, including but not limited to battery electrodes. The drying device provided in the embodiment of the present application connects at least part of the pipe section of the air inlet duct on the upstream side of the heating module with the exhaust duct, so that the fresh air in the section of the air inlet duct on the upstream side of the heating module pre-absorbs the heat of the return air flow in the exhaust duct, and then flows through the heating module to be heated, which not only improves the heating efficiency of the fresh air, but also can recycle the heat in the exhaust air flow, reducing energy waste, improving the heat utilization rate of the drying device and reducing its energy consumption.

[0043] The embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0044] Figure 1 is a schematic diagram of the structure of a drying device provided by an embodiment of the present application, Figure 2 yes Figure 1 The schematic diagram of the air flow direction of the drying device is shown in FIG. Figure 2 The thin solid arrows in the figure indicate the direction of the unheated airflow, the thick solid arrows indicate the direction of the heated airflow, and the dotted arrows indicate the direction of the return airflow from the drying duct. Figure 1 and Figure 2The drying device 10 of the present application includes an air inlet duct 11, a drying channel 12 and an exhaust duct 13 which are sequentially connected along the air flow direction. The drying channel 12 can accommodate the parts to be dried. For example, the parts to be dried can be battery electrodes. A heating module 14 is provided in the air inlet duct 11, and the heating module 14 is configured to heat the air flow passing through the heating module 14 in the air inlet duct 11. Among them, in the air flow direction, at least a portion of the pipe section of the air inlet duct 11 on the upstream side of the heating module 14 is connected to the exhaust duct 13.

[0045] Optionally, at least a portion of the air inlet duct 11 located upstream of the heating module 14 can be thermally connected to the exhaust duct 13. In other words, heat can be transferred between at least a portion of the air inlet duct 11 located upstream of the heating module 14 and the exhaust duct 13.

[0046] The drying device 10 provided in the embodiment of the present application utilizes a relatively high-temperature drying airflow to act on the items to be dried to dry the items to be dried. Unless otherwise specified, the airflow direction referred to in the embodiment of the present application refers to the airflow direction flowing inside the drying device 10.

[0047] In the air flow direction, the air inlet duct 11 is arranged at the upstream side of the drying channel 12, and is used to deliver airflow for drying to the drying channel 12. The air inlet duct 11 can be connected to a device capable of providing fresh air or an external environment, so that fresh air flows into the air inlet duct 11. Since the temperature of the fresh air is relatively low and cannot achieve the purpose of drying, a heating module 14 is required to heat the airflow in the air inlet duct 11 to increase the temperature of the airflow.

[0048] In the airflow direction, the exhaust duct 13 is arranged at the downstream side of the drying channel 12, and is used to exhaust the airflow flowing out of the drying channel 12, so that the airflow in the air inlet duct 11 can continuously flow into the drying channel 12. The exhaust duct 13 can be connected to a recovery device capable of recovering the solvent or the external environment.

[0049] It can be understood that the “fresh air” in the embodiment of the present application refers to the airflow that has not been processed by the drying device 10; the “air inlet duct” in the embodiment of the present application refers to the duct that can allow external air to flow into the drying device 10; the “exhaust duct” in the embodiment of the present application refers to the duct that can allow the air flow inside the drying device 10 to flow out.

[0050] The heating module 14 may be any module that can provide heat to the airflow. Optionally, the heating module 14 may be a heater that can directly heat the airflow. Exemplarily, the heater may be an electric heater, a ceramic heater, a heat storage material, a hot end of a semiconductor refrigeration sheet, etc. Optionally, the heating module 14 may also be a heat exchanger that heats the airflow by heat exchange between a heat exchange medium and the airflow.

[0051] At least a portion of the pipe section of the air inlet duct 11 located upstream of the heating module 14 is thermally connected to the exhaust duct 13, which means that at least a portion of the pipe section of the air inlet duct 11 located upstream of the heating module 14 can exchange heat with the exhaust duct 13, and heat can be transferred between at least a portion of the pipe section of the air inlet duct 11 located upstream of the heating module 14 and the exhaust duct 13. It can be understood that the airflow paths inside the air inlet duct 11 and the exhaust duct 13 are independent of each other.

[0052] The drying channel 12 may be formed in an oven housing, and is relatively closed except for being connected to the air inlet duct 11 and the air exhaust duct 13. The cross section of the drying channel 12 may be square, circular or other regular shapes, or may be irregular shapes, as long as it is convenient for accommodating the items to be dried.

[0053] The air inlet duct 11 is at least partially disposed in the oven shell to minimize the contact between the air inlet duct 11 and the external environment, thereby reducing the heat loss in the air inlet duct 11. Optionally, the section of the air inlet duct 11 on the downstream side of the heating module 14 is disposed in the oven shell, which is not only conducive to reducing heat loss, but also convenient for communicating with the drying channel 12, simplifying the structural design.

[0054] The exhaust duct 13 may be arranged inside the oven shell, or outside the oven shell, or may be arranged partially inside the oven shell and partially outside the oven shell.

[0055] The drying device 10 provided in the embodiment of the present application includes an air inlet duct 11, a drying channel 12 and an exhaust duct 13 which are sequentially connected along the air flow direction. The drying channel 12 can accommodate the items to be dried, and a heating module 14 is provided in the air inlet duct 11, and the heating module 14 can heat the air flow passing through it. When the fresh air entering the air inlet duct 11 passes through the heating module 14, it is heated by the heating module 14, and the heated air flow flows into the drying channel 12, acts on the items to be dried in the drying channel 12, and achieves the purpose of drying. The return air in the drying channel 12 flows into the exhaust duct 13, and the air flow temperature in the exhaust duct 13 is still relatively high, while the fresh air in the section of the air inlet duct 11 on the upstream side of the heating module 14 has not been heated by the heating module 14, and the temperature is relatively low. To this end, the embodiment of the present application connects at least a portion of the pipe section of the air inlet duct 11 on the upstream side of the heating module 14 to the exhaust duct 13, so that the fresh air in the section of the air inlet duct 11 on the upstream side of the heating module 14 absorbs the heat of the return air flow in the exhaust duct 13 in advance, and then flows through the heating module 14 to be heated. This not only improves the heating efficiency of the fresh air, but also can recycle the heat in the exhaust air flow, thereby reducing energy waste, improving the heat utilization rate of the drying device 10 and reducing its energy consumption.

[0056] In some embodiments, the air inlet duct 11 includes a first pipe section 111 and a second pipe section 112, which are connected via a connecting pipe section 113, and the heating module 14 is disposed on the connecting pipe section 113. In the airflow direction, the first pipe section 111 is located on the upstream side of the second pipe section 112. Figure 3 is a schematic diagram of the structure of the first pipe section, the second pipe section and the exhaust passage of the drying device provided in one embodiment of the present application, with reference to Figure 3 The first pipe section 111 and the exhaust duct 13 are radially stacked.

[0057] In the direction of air flow, the heating module 14 is located on the downstream side of the first pipe section 111 and on the upstream side of the second pipe section 112. Therefore, the airflow in the first pipe section 111 has not yet flowed through the heating module 14, and the airflow temperature is relatively low. The airflow flowing in the second pipe section 112 is the airflow that has been heated by the heating module 14, and the airflow has not yet dried the drying parts, so the airflow temperature is relatively high. The airflow in the exhaust duct 13 is the return airflow after flowing through the drying channel 12 to dry the drying parts, and its temperature is obviously lower than the airflow temperature in the second pipe section 112, and higher than the airflow temperature in the first pipe section 111.

[0058] The first pipe section 111 and the exhaust duct 13 have the same shape to increase the contact area between them. Optionally, the first pipe section 111 and the exhaust duct 13 can both be straight pipe structures, or can both be bent or curved pipe structures.

[0059] The radial stacking arrangement of the first pipe section 111 and the exhaust duct 13 means that the first pipe section 111 and the exhaust duct 13 are arranged closely in the radial direction. In the embodiment of the present application, the first pipe section 111 and the exhaust duct 13 are radially stacked, so that the pipe wall of the first pipe section 111 and the pipe wall of the exhaust duct 13 are in direct contact with each other, and the contact area is large. The heat of the airflow in the exhaust duct 13 can be transferred to the airflow of the first pipe section 111 through the pipe wall of the exhaust duct 13 and the pipe wall of the first pipe section 111. The heat transfer efficiency is relatively high, and the pipe structure layout of the drying device 10 can be made more compact, reducing the occupied space.

[0060] In some embodiments, reference Figure 3 The second pipe section 112 and the first pipe section 111 are radially stacked.

[0061] The second pipe section 112 and the first pipe section 111 have the same pipe shape to increase the contact area between the two and improve the stacking effect between the two. Optionally, the first pipe section 111 and the second pipe section 112 can both be straight pipe structures, or can both be bent or curved pipe structures.

[0062] The second pipe section 112 and the exhaust duct 13 are both located radially outside the first pipe section 111. Optionally, the second pipe section 112 and the exhaust duct 13 can be spaced apart to reduce heat transfer therebetween and prevent the heat in the second pipe section 112 from being carried away by the airflow in the exhaust duct 13.

[0063] In the embodiment of the present application, the first pipe segment 111 and the second pipe segment 112 are radially stacked so that the pipe wall of the first pipe segment 111 is in direct contact with the pipe wall of the second pipe segment 112. On the one hand, this can reduce the area of ​​the second pipe segment 112 exposed to the outside, thereby reducing the heat loss of the second pipe segment 112. On the other hand, it can further improve the compactness of the pipeline structure layout and simplify the pipeline structure.

[0064] In some embodiments, reference Figure 3 , the second pipe section 112 and the exhaust duct 13 are respectively located on two opposite sides of the first pipe section 111 in the radial direction. Therefore, under the premise of ensuring that the second pipe section 112 and the exhaust duct 13 are radially stacked with the first pipe section 111, the distance between the second pipe section 112 and the exhaust duct 13 is increased as much as possible, the possibility of heat transfer between the second pipe section 112 and the exhaust duct 13 is reduced, and the influence of the exhaust duct 13 on the air supply temperature of the second pipe section 112 is reduced.

[0065] In some embodiments, the air inlet duct 11 includes a second pipe segment 112 and multiple first pipe segments 111. In the airflow direction, the multiple first pipe segments 111 are arranged in parallel on the upstream side of the second pipe segment 112, and the heating module 14 is located on the downstream side of the multiple first pipe segments 111 and the upstream side of the second pipe segment 112. Figure 4 Schematic diagram of the structure of the first pipe section and the exhaust channel of the drying device provided by another embodiment of the present application. Figure 4 Each first pipe section 111 is radially stacked with the exhaust duct 13 .

[0066] The multiple first pipe sections 111 are arranged in parallel, which means that the first pipe sections 111 are not connected to each other, and the airflow paths in the first pipe sections 111 are independent of each other.

[0067] Each of the first pipe sections 111 is connected to the upstream side of the second pipe section 112 , and the airflow in the first pipe sections 111 can flow into the second pipe section 112 .

[0068] The heating module 14 can be arranged at the connection position of multiple first pipe segments 111 and the second pipe segment 112, or at the connection section between multiple first pipe segments 111 and the second pipe segment 112. The airflow in any first pipe segment 111 flows through the heating module 14 before flowing into the second pipe segment 112, and is heated by the heating module 14 before flowing into the second pipe segment 112.

[0069] Each first pipe section 111 is disposed radially outside the exhaust duct 13 and contacts the wall of the exhaust duct 13. The plurality of first pipe sections 111 may be disposed at intervals from each other, or may be stacked in sequence around the circumference of the exhaust duct 13.

[0070] In the embodiment of the present application, the air inlet duct 11 is divided into a second pipe section 112 and a plurality of first pipe sections 111, each of which is radially stacked with the exhaust duct 13, and the airflow in each first pipe section 111 can exchange heat with the airflow in the exhaust duct 13, thereby improving the recycling rate of the heat of the airflow in the exhaust duct 13 and further reducing the heat loss of the drying device 10. On this basis, the extension length of the exhaust duct 13 and the first pipe section 111 can also be appropriately shortened to simplify the structure of the drying device 10 and improve the rationality of its structural layout.

[0071] In some embodiments, the air inlet duct 11 includes a first pipe segment 111 and a second pipe segment 112. The first pipe segment 111 and the second pipe segment 112 are connected via a connecting pipe segment 113. The heating module 14 is disposed in the connecting pipe segment 113. In the airflow direction, the first pipe segment 111 is located on the upstream side of the second pipe segment 112. Figure 5 is a structural schematic diagram of the first pipe section and the exhaust passage of the drying device provided in another embodiment of the present application, referring to Figure 5 The first pipe section 111 and the exhaust duct 13 are sleeved together.

[0072] In the direction of air flow, the heating module 14 is located on the downstream side of the first pipe section 111 and on the upstream side of the second pipe section 112. Therefore, the airflow in the first pipe section 111 has not yet flowed through the heating module 14, and the airflow temperature is relatively low. The airflow flowing in the second pipe section 112 is the airflow that has been heated by the heating module 14, and the airflow has not yet dried the drying parts, so the airflow temperature is relatively high. The airflow in the exhaust duct 13 is the return airflow after flowing through the drying channel 12 to dry the drying parts, and its temperature is obviously lower than the airflow temperature in the second pipe section 112, and higher than the airflow temperature in the first pipe section 111.

[0073] Optionally, the first pipe section 111 can be sleeved on the outside of the exhaust duct 13, reducing the contact area between the exhaust duct 13 and the external environment, so that more heat in the exhaust duct 13 is transferred to the first pipe section 111, thereby improving the heat recovery rate in the exhaust duct 13. At this time, the first pipe section 111 includes an inner pipe wall and an outer pipe wall, and an annular airflow channel is defined between the inner pipe wall and the outer pipe wall for fresh air to circulate. The inner pipe wall of the first pipe section 111 is annular, and a hollow portion is defined inside the annular inner pipe wall, and the exhaust duct 13 is plugged into the hollow portion.

[0074] Optionally, the first pipe section 111 can be sleeved inside the exhaust duct 13, increasing the radial dimension of the first pipe section 111, thereby increasing the contact area between the first pipe section 111 and the exhaust duct 13, and improving the heat exchange efficiency between the first pipe section 111 and the exhaust duct 13. At this time, the exhaust duct 13 includes an inner pipe wall and an outer pipe wall, and an annular airflow channel is defined between the inner pipe wall and the outer pipe wall for the return air flow to flow. The inner pipe wall of the exhaust duct 13 is annular, and a hollow portion is defined inside the annular inner pipe wall, and the first pipe section 111 is plugged into the hollow portion.

[0075] The first pipe section 111 and the exhaust duct 13 have the same pipe shape to improve the smoothness of the sleeve connection between the first pipe section 111 and the exhaust duct 13. Optionally, both the first pipe section 111 and the exhaust duct 13 can be straight pipe structures.

[0076] The embodiment of the present application divides the air inlet duct 11 into a second pipe section 112 and a first pipe section 111, and the first pipe section 111 and the exhaust duct 13 are sleeved together. The contact surface between the first pipe section 111 and the exhaust duct 13 is an annular surface, which increases the contact area between the first pipe section 111 and the exhaust duct 13 and improves the heat exchange effect between the first pipe section 111 and the exhaust duct 13.

[0077] In some embodiments, the first pipe section 111 and the adjacent pipe walls of the exhaust duct 13 are stacked to form a barrier layer, and the thickness of the barrier layer is 0.5 mm to 5 mm. Optionally, the thickness of the barrier layer can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm.

[0078] It is understandable that the thickness of the isolation layer may be the sum of the wall thickness of the first pipe section 111 and the wall thickness of the exhaust duct 13 .

[0079] Theoretically, the smaller the thickness of the barrier layer between the first pipe section 111 and the exhaust duct 13, the better the heat exchange effect between the first pipe section 111 and the exhaust duct 13. However, both the first pipe section 111 and the exhaust duct 13 are used to circulate airflow, and there is a certain amount of wind pressure acting on the pipe wall in both the first pipe section 111 and the exhaust duct 13. The pipe wall needs to be able to withstand a certain pressure to maintain its shape and ensure structural strength. For this reason, the embodiment of the present application sets the thickness of the barrier layer between the first pipe section 111 and the exhaust duct 13 to be greater than 0.5 mm, thereby improving the heat exchange effect between the first pipe section 111 and the exhaust duct 13 as much as possible while ensuring structural strength.

[0080] At the same time, in order to achieve effective heat exchange between the first pipe section 111 and the exhaust duct 13, the thickness of the isolation layer between the first pipe section 111 and the exhaust duct 13 should not be too large.

[0081] In some embodiments, the drying channel 12 is located radially outside at least part of the air inlet duct 11, and the air inlet duct 11 is provided with an air outlet 114 on the pipe wall 115 facing the drying channel 12. The air inlet duct 11 is connected to the drying channel 12 through the air outlet 114, so that the air flow in the air inlet duct 11 flows into the drying channel 12 through the air outlet 114. An air outlet nozzle 15 is provided at the air outlet 114, and the air outlet nozzle 15 extends from the pipe wall 115 of the air inlet duct 11 toward the drying channel 12. The drying device 10 further includes a flow guide 16, which is provided between the outside of the air outlet nozzle 15 and the pipe wall 115 of the air inlet duct 11, and covers the connection position between the air outlet nozzle 15 and the pipe wall 115 of the air inlet duct 11.

[0082] The air inlet duct 11 may include a first pipe section 111 and a second pipe section 112 sequentially arranged along the airflow direction, and the heating module 14 is arranged between the first pipe section 111 and the second pipe section 112. The drying channel 12 may be located radially outside the second pipe section 112 to increase the adjacent area between the second pipe section 112 and the drying channel 12, so as to facilitate the arrangement of multiple air outlets 114 between the two.

[0083] An air outlet 114 is provided on the pipe wall 115 of the air inlet duct 11 facing the drying channel 12, and the airflow in the air inlet duct 11 can flow radially into the drying channel 12, shortening the airflow path from the air inlet duct 11 to the drying channel 12 and improving the drying efficiency.

[0084] The air inlet duct 11 may include a plurality of sections radially adjacent to the drying channel 12. Optionally, the second pipe section 112 of the air inlet duct 11 is radially adjacent to the drying channel 12, and the number of the second pipe sections 112 may be multiple, and the multiple second pipe sections 112 are distributed along the circumference of the drying channel 12. An air outlet 114 is provided on the pipe wall 115 of each second pipe section 112 facing the drying channel 12, thereby, airflow can be transported into the drying channel 12 in multiple different directions along the radial direction of the drying channel 12, so that the airflow acts evenly on the items to be dried, thereby improving the drying effect of the items to be dried.

[0085] Exemplarily, the number of the second pipe sections 112 may be two, and the two second pipe sections 112 are arranged opposite to each other and spaced apart along the first direction to form a drying passage 12 therebetween. Optionally, the two second pipe sections 112 may be arranged in parallel, and each second pipe section 112 is directly connected to the first pipe section 111 and directly connected to the drying passage 12. Optionally, the two second pipe sections 112 may also be arranged in series, and the two second pipe sections 112 are connected in sequence along the airflow direction, and only one of the second pipe sections 112 is directly connected to the first pipe section 111.

[0086] The airflow is blown out from the air outlet 114 in different directions. The air outlet nozzle 15 provided at the air outlet 114 extends into the drying channel 12. The air outlet nozzle 15 can appropriately restrict the airflow direction so that more airflow is blown directly onto the items to be dried, thereby improving the drying effect.

[0087] The extension direction of the air outlet nozzle 15 may be perpendicular to the extension direction of the second pipe section 112, that is, the air outlet nozzle 15 extends along the radial direction of the second pipe section 112. Optionally, the air outlet nozzle 15 may be a columnar structure or a conical structure.

[0088] The connection position between the air outlet 15 and the second pipe section 112 forms a corner portion that is approximately a right angle, an obtuse angle or an acute angle. The corner portion is prone to produce eddies, vortices and the like. The solvent in the air flow is prone to accumulate and condense here, and then drip onto the items to be dried, affecting the drying effect of the items to be dried.

[0089] To this end, in the embodiment of the present application, a guide member 16 is arranged between the outside of the air outlet nozzle 15 and the tube wall 115 of the air inlet duct 11. The guide member 16 can cover the connection position between the air outlet nozzle 15 and the tube wall 115 of the air inlet duct 11, so that the airflow flowing out of the air outlet 114 is effectively blown toward the workpiece to be dried, avoiding the generation of eddy currents, vortices and the like as much as possible, reducing the condensation of solvents in the airflow, and improving the drying effect.

[0090] Any connection position between the air outlet nozzle 15 and the pipe wall 115 of the air inlet duct 11 can be covered by the guide member 16. The shape of the guide member 16 can be reasonably selected according to the cross-sectional shape of the air outlet nozzle 15. Optionally, when the cross-sectional shape of the air outlet nozzle 15 is circular, the guide member 16 can be a cone; when the cross-sectional shape of the air outlet nozzle 15 is square, the guide member 16 can be a pyramid.

[0091] The cross-sectional shape of the air outlet 15 may be the same as or different from the cross-sectional shape of the air outlet 114. The cross-sectional shape of the air outlet 15 may be circular, square or other suitable shapes.

[0092] The guide member 16 may extend in a curved manner or in a straight and inclined manner, as long as it can cover the connection position between the air outlet nozzle 15 and the pipe wall 115 of the air inlet duct 11 .

[0093] In some embodiments, the air outlet nozzle 15 defines an air outlet duct 151 inside, and the two ends of the air outlet duct 151 are respectively connected to the air outlet 114 and the drying channel 12. The guide member 16 is bent and extended along the extension direction of the drying channel 12 from one end of the air outlet duct 151 connected to the drying channel 12 to the pipe wall 115 of the air inlet duct 11.

[0094] The guide member 16 may be convexly curved toward the radial inner side of the drying passage 12 , or may be convexly curved toward the radial outer side of the drying passage 12 .

[0095] One end of the guide member 16 is connected to the end of the air outlet duct 151 , so as to guide the airflow as soon as it flows out of the air outlet duct 151 , thereby achieving a better guiding effect.

[0096] The curved and extended guide member 16 can guide the airflow passing through its surface, buffer the change of the airflow direction, and thus reduce the resistance to the airflow.

[0097] In some embodiments, the pipe wall 115 of the air inlet duct 11 includes a first wall surface 1151 and a second wall surface 1152, the first wall surface 1151 and the second wall surface 1152 are arranged opposite to each other and spaced apart, the drying channel 12 is formed between the first wall surface 1151 and the second wall surface 1152, and the first wall surface 1151 is provided with an air outlet 114. The exhaust duct 13 is connected to the drying channel 12 through a return air outlet 131. A return air nozzle 17 is provided at the return air outlet 131, and the return air nozzle 17 extends from the first wall surface 1151 into the drying channel 12. The air outlet nozzle 15 and the return air nozzle 17 are adjacent to and spaced apart along the extension direction of the drying channel 12, and the guide member 16 is provided between the air outlet nozzle 15 and the return air nozzle 17, and covers the connection position between the return air nozzle 17 and the first wall surface 1151.

[0098] The air inlet duct 11 may include two second pipe sections 112, which are respectively arranged on opposite sides of the drying channel 12 in the radial direction, and the drying channel 12 is formed between the two second pipe sections 112. The first wall 1151 and the second wall 1152 are respectively the pipe walls of the two second pipe sections 112 facing the drying channel 12.

[0099] The first wall surface 1151 and the second wall surface 1152 may both be straight wall surfaces or may both be curved wall surfaces.

[0100] The first wall 1151 provided with the air outlet 114 can face the surface of the dried object to be dried, so that the wind blown out of the air outlet 114 directly acts on the surface of the dried object to be dried. For example, when the dried object is a battery electrode, the first wall 1151 can face the side of the battery electrode coated with active material.

[0101] The return air port 131 may be provided in the pipe wall of the exhaust duct 13, and the return air nozzle 17 extends from the pipe wall of the exhaust duct 13 into the drying channel 12. When the exhaust duct 13, the first pipe section 111, and the second pipe section 112 are stacked in sequence, the return air nozzle 17 may extend through the first pipe section 111 and the second pipe section 112 to the drying channel 12, and the return air channel in the return air nozzle 17 is fluidically isolated from the first pipe section 111 and the second pipe section 112, and the return air flow in the return air nozzle 17 will not mix or affect the fresh air flow in the first pipe section 111 and the air flow in the second pipe section 112.

[0102] The length of the return air nozzle 17 extending into the drying channel 12 may be shorter than the length of the outlet air nozzle 15 extending into the drying channel 12, so as to extend the flow path of the airflow in the drying channel 12 as much as possible, thereby improving the drying effect.

[0103] Specifically, the return air nozzle 17 can extend through the first wall 1151 of the second pipe section 112 and extend out of the drying channel 12. The return air nozzle 17 and the first wall 1151 will also form a corner portion, which will also produce eddy currents, vortices, and the like. In addition, the air outlet nozzle 15 and the return air nozzle 17 are adjacent and spaced apart along the extension direction of the drying channel 12, which is conducive to the rapid flow of air. However, the airflow directions in the air outlet nozzle 15 and the return air nozzle 17 are opposite, and the area between the air outlet nozzle 15 and the return air nozzle 17 is more likely to produce eddy currents, vortices, and the like.

[0104] To this end, the embodiment of the present application arranges the guide member 16 between the air outlet nozzle 15 and the return air nozzle 17, and covers the connection position between the return air nozzle 17 and the first wall 1151, so that the channel between the air outlet nozzle 15 and the return air nozzle 17 is arc-shaped, reducing dead corners such as corners and corners, effectively reducing the generation of eddies, vortices and other phenomena, reducing the condensation of solvents in the airflow, and improving the drying effect.

[0105] One end of the guide member 16 may be connected to the air outlet nozzle 15 , and the other end may be connected to the first wall surface 1151 and abut against the return air nozzle 17 , or may be connected to the return air nozzle 17 .

[0106] In some embodiments, the number of the air outlets 114 and the return air outlets 131 are both multiple, and the multiple air outlets 114 and the multiple return air outlets 131 are alternately and spacedly distributed along the extension direction of the drying channel 12. As a result, in the extension direction of the drying channel 12, the distribution of the air outlets 114 and the distribution of the return air outlets 131 are more uniform, which is conducive to uniform drying of the long pieces to be dried, thereby improving the drying effect. In addition, the alternating distribution of the air outlets 114 and the return air outlets 131 is conducive to the rapid outflow of the return airflow passing through the pieces to be dried, which is conducive to increasing the proportion of effective drying airflow in the drying channel 12 and improving the drying efficiency.

[0107] Furthermore, a guide member 16 may be provided between any adjacent air outlets 114 and return air outlets 131. A guide member 16 may also be provided at the air outlets 114 or return air outlets 131 at the ends in the extending direction of the drying passage 12.

[0108] In some embodiments, the second wall surface 1152 is provided with air outlets 114 , and the air outlets 114 provided on the first wall surface 1151 and the air outlets 114 provided on the second wall surface 1152 are staggeredly distributed along the extension direction of the drying channel 12 .

[0109] The airflow blown out from the air outlet 114 of the second wall 1152 can be blown toward the workpiece to be dried from another direction, and the heat in the airflow can directly act on the drying surface of the workpiece to be dried, or act on the substrate in a transfer manner to act on the drying surface of the workpiece to be dried, thereby improving the drying efficiency.

[0110] The air outlets 114 of the first wall 1151 and the air outlets 114 of the second wall 1152 are staggeredly distributed along the extension direction of the drying channel 12, so that the airflows blown from both sides act on different areas of the items to be dried, thereby improving the drying effect and drying uniformity.

[0111] In some embodiments, the drying device 10 also includes a recovery module 18, which is configured to recover the solvent in the gas flowing through it. The recovery module 18 is connected to the exhaust duct 13 through a first recovery pipeline 191, and is connected to the air inlet duct 11 through a second recovery pipeline 192. At least partial sections of the first recovery pipeline 191 and the second recovery pipeline 192 are thermally connected.

[0112] The recovery module 18 can reduce the temperature of the airflow passing through it, so that the solvent carried in the airflow is condensed and the solvent is separated from the gas, thereby achieving the purpose of solvent recovery. The solvent carried in the airflow may include water or other liquids.

[0113] The recovery module 18 can be any device capable of recovering the solvent. The recovery module 18 can recover the solvent by lowering the temperature of the airflow, or can recover the solvent by other means. Optionally, the recovery module 18 can be a heat exchanger, which reduces the temperature of the airflow by exchanging heat between the cooling medium and the airflow.

[0114] The recovery module 18 is connected to the air inlet duct 11 through the second recovery pipeline 192, and at least part of the airflow after the solvent is recovered by the recovery module 18 can enter the air inlet duct 11 as fresh air.

[0115] The recovery module 18 may also be in communication with the external environment, and part of the airflow after the solvent is recovered by the recovery module 18 may be discharged to the external environment.

[0116] The airflow in the exhaust duct 13 can flow to the first recovery duct 191, and the airflow temperature in the first recovery duct 191 is relatively high. The airflow after the solvent is recovered by the recovery module 18 flows to the second recovery duct 192, and the airflow temperature in the second recovery duct 192 is relatively low. In the embodiment of the present application, the first recovery duct 191 and the second recovery duct 192 are thermally connected, and heat exchange can be performed between the first recovery duct 191 and the second recovery duct 192. The airflow in the second recovery duct 192 can absorb the heat of the airflow in the first recovery duct 191, and heat the airflow flowing into the air inlet duct 11 in advance, further improving the heat utilization rate, reducing heat waste, and reducing the energy consumption of the drying device 10.

[0117] According to a second aspect of the present application, the present application also provides a coating device, Figure 6 1 is a schematic diagram of a structure of a coating device provided in an embodiment of the present application. The coating device 100 provided in an embodiment of the present application includes a drying device 10 provided in any of the above embodiments.

[0118] The coating device 100 provided in the embodiment of the present application includes the drying device 10 provided in any embodiment of the present application, and thus has the same technical effect, which will not be described in detail here.

[0119] In some embodiments, the drying device 10 provided in the embodiment of the present application includes an air inlet duct 11, a drying channel 12 and an exhaust duct 13 which are sequentially connected along the air flow direction. The drying channel 12 can accommodate the electrode waiting for drying parts, and a heating module 14 is provided in the air inlet duct 11, and the heating module 14 is configured to heat the airflow flowing through the heating module 14 in the air inlet duct 11. The air inlet duct 11 may include a first pipe section 111 located at the upstream side of the heating module 14 and a second pipe section 112 located at the downstream side of the heating module 14, and the second pipe section 112 is connected to the drying channel 12 through an air outlet 114. The first pipe section 111 and the exhaust duct 13 can be thermally connected by stacking, sleeve connection, etc. The airflow in the first pipe section 111 pre-absorbs the heat of the return airflow in the exhaust duct 13, and then flows through the heating module 14 to be heated, which not only improves the heating efficiency of the fresh air, but also can recycle the heat in the exhaust airflow, reduce energy waste, improve the heat utilization rate of the drying device 10, and reduce its energy consumption.

[0120] The air outlet 114 may be provided with an air outlet nozzle 15, which extends from the pipe wall 115 of the air inlet duct 11 toward the drying channel 12. The drying device 10 further includes a guide member 16, which is provided between the outside of the air outlet nozzle 15 and the pipe wall 115 of the air inlet duct 11, and covers the connection position between the air outlet nozzle 15 and the pipe wall 115 of the air inlet duct 11, so that the airflow flowing out of the air outlet 114 is effectively blown toward the to-be-dried object, and the generation of eddy currents and vortices is avoided as much as possible, thereby reducing the condensation of solvents in the airflow and improving the drying effect.

[0121] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drying device, characterized in that: The drying device comprises an air inlet duct, a drying channel and an exhaust duct which are sequentially connected along the air flow direction, the drying channel can accommodate the items to be dried, a heating module is arranged in the air inlet duct, and the heating module is configured to heat the air flow in the air inlet duct passing through the heating module; Wherein, in the air flow direction, at least a portion of the air inlet duct located upstream of the heating module is connected to the exhaust duct.

2. The drying device according to claim 1, characterized in that: The air inlet duct comprises a first pipe section and a second pipe section, the first pipe section and the second pipe section are connected via a connecting pipe section, the heating module is arranged on the connecting pipe section, and in the airflow direction, the first pipe section is located on the upstream side of the second pipe section; The first pipe section and the exhaust duct are radially stacked.

3. The drying device according to claim 2, characterized in that: The second pipe section and the first pipe section are radially stacked.

4. The drying device according to claim 3, characterized in that: The second pipe section and the exhaust duct are respectively located on two opposite sides of the first pipe section in the radial direction.

5. The drying device according to claim 1, characterized in that: The air inlet duct comprises a second pipe segment and a plurality of first pipe segments, wherein in the airflow direction, the plurality of first pipe segments are arranged in parallel on the upstream side of the second pipe segment, and the heating module is located on the downstream side of the plurality of first pipe segments and the upstream side of the second pipe segment; Each of the first pipe sections is radially stacked with the exhaust duct.

6. The drying device according to claim 1, characterized in that: The air inlet duct comprises a first pipe section and a second pipe section, the first pipe section and the second pipe section are connected via a connecting pipe section, the heating module is arranged on the connecting pipe section, and in the airflow direction, the first pipe section is located on the upstream side of the second pipe section; The first pipe section and the exhaust duct are sleeved together.

7. The drying device according to any one of claims 2 to 6, characterized in that: The first pipe section and the adjacent pipe wall of the exhaust duct are stacked to form a partition layer, and the thickness of the partition layer is 0.5 mm to 5 mm.

8. The drying device according to claim 1, characterized in that: The drying channel is located radially outside at least part of the air inlet duct, the air inlet duct is provided with an air outlet on the tube wall facing the drying channel, the air inlet duct is connected to the drying channel through the air outlet, and an air outlet nozzle is provided at the air outlet, and the air outlet nozzle extends from the tube wall of the air inlet duct toward the drying channel; The drying device further includes a flow guide, which is disposed between the outside of the air outlet nozzle and the tube wall of the air inlet duct and covers a connection position between the air outlet nozzle and the tube wall of the air inlet duct.

9. The drying device according to claim 8, characterized in that: An air outlet duct is defined inside the air outlet nozzle, and two ends of the air outlet duct are respectively connected to the air outlet and the drying channel; The flow guide member is bent and extended from one end of the air outlet duct connected to the drying channel along the extension direction of the drying channel to the pipe wall of the air inlet duct.

10. The drying device according to claim 8, characterized in that: The pipe wall of the air inlet duct includes a first wall surface and a second wall surface, the first wall surface and the second wall surface are opposite to each other and spaced apart, the drying channel is formed between the first wall surface and the second wall surface, and the first wall surface is provided with the air outlet; The exhaust duct is connected to the drying channel through a return air port, a return air nozzle is provided at the return air port, the return air nozzle extends from the first wall surface into the drying channel, the air outlet nozzle and the return air nozzle are adjacent to and spaced apart along the extension direction of the drying channel, the flow guide is provided between the air outlet nozzle and the return air nozzle, and covers the connection position between the return air nozzle and the first wall surface.

11. The drying device according to claim 10, characterized in that: The number of the air outlets and the number of the return air outlets are both multiple, and the multiple air outlets and the multiple return air outlets are alternately and spacedly distributed along the extension direction of the drying channel.

12. The drying device according to claim 10, characterized in that: The second wall surface is provided with the air outlet, and the air outlet provided on the first wall surface and the air outlet provided on the second wall surface are staggeredly distributed along the extension direction of the drying channel.

13. The drying device according to claim 1, characterized in that: The drying device also includes a recovery module, which is configured to recover the solvent in the gas flowing through it. The recovery module is connected to the exhaust duct through a first recovery pipeline and to the air inlet duct through a second recovery pipeline. At least part of the first recovery pipeline and the second recovery pipeline are thermally connected.

14. A coating device, characterized in that: It comprises a drying device according to any one of claims 1-13.

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