Pole piece composite heating and drying device
By combining electromagnetic heating components and infrared heating components, the problem of insufficient internal drying when drying battery electrodes in an oven is solved, achieving efficient electrode heating and drying, improving processing efficiency and reducing equipment costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-03
AI Technical Summary
In the existing technology, when using an oven to dry battery electrodes, the hot air transfers heat to the surface of the electrodes but the interior is not dried enough, resulting in the hardening and cracking of the wet film, low processing efficiency, and long heating time.
An electromagnetic heating element is used to heat the metal substrate of the electrode internally, and an infrared heating element is used to heat the surface of the wet film, so as to achieve simultaneous drying of the interior and the surface and avoid cracking.
The electrode heating efficiency is increased by more than 25%, the drying rate is increased by more than 40%, the heating time is shortened, the equipment volume is reduced by 35%, and the cost is reduced by 20%.
Smart Images
Figure CN224080641U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery processing technology, and in particular to an electrode composite heating and drying device. Background Technology
[0002] During the battery manufacturing process, the battery electrodes need to be dried. The battery electrodes are usually dried using an oven.
[0003] In related technologies, when using an oven to dry battery electrodes, the oven typically generates hot air to dry the electrodes. When the hot air heats the electrodes, it transfers a large amount of heat to the surface of the electrodes, and then the heat is conducted from the surface of the electrodes to the interior. In order to prevent the surface of the wet film of the electrodes from hardening and the interior from not drying in time, which would cause the electrodes to crack, a relatively long period of low temperature and high air volume is required to heat the wet film of the electrodes. Therefore, the electrode processing efficiency is low and the heating time is long. Utility Model Content
[0004] To address or partially address the problems existing in related technologies, this application provides an electrode composite heating and drying device that can directly heat the interior and surface of the electrode, thereby improving the electrode heating efficiency.
[0005] This application provides a composite heating and drying apparatus for electrodes, comprising a main body, a roller assembly, an electromagnetic heating assembly, and an infrared heating assembly; the main body has an initial end and an end end; the roller assembly is connected to the main body and is used to drive the electrode from the initial end to the end end; the electromagnetic heating assembly is connected to the main body and is located at the initial end, and is used to heat the metal substrate of the electrode; the infrared heating assembly is connected to the main body and is located between the initial end and the end end, and is used to heat the surface of the electrode.
[0006] Furthermore, the main body includes a base and an upper housing, the upper housing being located above the base, the base and the upper housing together forming a heating channel, the electromagnetic heating component and the infrared heating component being located within the heating channel, the initial end being located at one end of the heating channel, and the final end being located at the other end of the heating channel.
[0007] Furthermore, the main body includes a lifting mechanism, which is connected to the base and the upper housing respectively. The lifting mechanism drives the upper housing to rise and fall. The roller assembly is installed on the base, and the electromagnetic heating assembly and the infrared heating assembly are installed on the upper housing.
[0008] Furthermore, the lifting mechanism includes a cylinder and a guide rod. The cylinder body is mounted on the base, the piston rod of the cylinder is connected to the upper housing, the guide rod extends vertically, the bottom end of the guide rod is fixed to the base, and the guide rod passes through the upper housing.
[0009] Furthermore, the electromagnetic heating assembly includes a height adjustment mechanism, an angle adjustment mechanism, and an electromagnetic transmitter. The height adjustment mechanism is connected to the angle adjustment mechanism and is used to adjust the height of the angle adjustment mechanism. The angle adjustment mechanism is connected to the electromagnetic transmitter and is used to adjust the angle of the electromagnetic transmitter relative to the roller assembly. The electromagnetic transmitter is used to heat the metal substrate of the electrode sheet.
[0010] Furthermore, the height adjustment mechanism includes a fixed rod, a mounting bracket, and an adjusting bolt. The fixed rod is connected to the main body and is located inside the main body. The mounting bracket has a hollow hole through which the fixed rod passes. The adjusting bolt passes through the mounting bracket from top to bottom and abuts against the top of the fixed rod. The mounting bracket is connected to the angle adjustment mechanism.
[0011] Furthermore, the angle adjustment mechanism includes a rotating frame and a limiting bolt. One end of the rotating frame is hinged to the mounting frame. The rotating frame has an arc-shaped limiting hole, the center of which is located at the hinge between the rotating frame and the mounting frame. The limiting bolt is fixed to the mounting frame and passes through the limiting hole.
[0012] Furthermore, the electrode composite heating and drying device also includes a dehumidification mechanism, which includes a dehumidification fan and an air duct. A dehumidification port is provided on the top of the main body, one end of the air duct is connected to the dehumidification port, and the dehumidification fan is connected to the air duct.
[0013] Furthermore, the top of the main body has an arched structure, and the vent is located at the top of the main body.
[0014] Furthermore, a fresh air module is provided inside the main body, and the fresh air module is located below the roller assembly. The fresh air module is used to provide fresh air into the main body.
[0015] The technical solution provided in this application can include the following beneficial effects: By using an electromagnetic heating component in conjunction with an infrared heating component to composite heat the electrode sheet, the electromagnetic heating component first heats the inside of the electrode sheet, causing the metal substrate of the electrode sheet to generate heat. The metal substrate transfers heat to the wet film of the electrode sheet, and the inside of the wet film of the electrode sheet hardens and dries first. Then, the infrared lamp tube is used to radiate heat to heat the surface of the wet film. There is no risk of cracking in the electrode sheet. The inside and outside of the electrode sheet can be heated instantly, shortening the heating and drying time of the electrode sheet. Compared with the traditional hot air drying system, the heating rate is increased by more than 25% and the drying rate is increased by more than 40%.
[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0017] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.
[0018] Figure 1 This is a schematic diagram of the structure of the electrode composite heating and drying device shown in the embodiments of this application;
[0019] Figure 2 This is a cross-sectional view of the electrode composite heating and drying apparatus shown in the embodiments of this application;
[0020] Figure 3 This is a front view of the electrode composite heating and drying apparatus shown in the embodiments of this application;
[0021] Figure 4 This is illustrated in the embodiments of this application. Figure 1 A magnified view of A in the middle.
[0022] Reference numerals: Main body 1; Initial end 11; End end 12; Base 13; Upper shell 14; Lifting mechanism 15; Cylinder 151; Guide rod 152; Exhaust port 16; Fresh air module 17; Roller assembly 2; Electromagnetic heating assembly 3; Height adjustment mechanism 31; Fixing rod 311; Mounting bracket 312; Limiting hole 313; Adjusting bolt 314; Hollow hole 315; Angle adjustment mechanism 32; Rotating frame 321; Limiting bolt 322; Electromagnetic transmitter 33; Infrared heating assembly 4; Exhaust mechanism 5; Exhaust fan 51; Air duct 52; Drive mechanism 6; Motor 61; Transmission assembly 62; Electrode 7. Detailed Implementation
[0023] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.
[0024] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0025] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0026] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0027] When drying battery electrodes in an oven, hot air is typically generated to dry the electrodes. As the hot air heats the electrodes, a large amount of heat is transferred to the electrode surface upon contact, and then the heat is conducted from the surface to the interior. To prevent the wet film on the electrode from hardening and the interior from not drying sufficiently, leading to electrode cracking, a relatively long period of low-temperature, high-volume heating of the wet film is required. This results in low electrode processing efficiency and a long heating time. To address these problems, this application provides an electrode composite heating and drying device that can directly heat both the interior and surface of the electrode, improving electrode heating efficiency.
[0028] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.
[0029] See Figure 1 and Figure 2 The electrode composite heating and drying device includes a main body 1, a roller assembly 2, an electromagnetic heating assembly 3, and an infrared heating assembly 4. The main body 1 has an initial end 11 and an end end 12. The roller assembly 2 is connected to the main body 1 and includes multiple rollers arranged in parallel. Preferably, the rollers are ceramic insulating rollers. The electrode composite heating and drying device also includes a drive mechanism 6, which includes a motor 61 and a transmission assembly 62. The motor 61 is mounted on the main body 1, and the main body 1 is connected to the transmission assembly 62. The main body 1 drives the multiple rollers to rotate via the transmission assembly 62. The roller assembly 2 is used to drive the electrode 7 from the initial end 11 to the end end 12. The electrode 7 can enter the main body 1 from the initial end 11, be driven by the rollers to the end end 12, and then be output from the main body 1 through the end end 12.
[0030] See Figure 1 The electromagnetic heating component 3 is connected to the main body 1 and is located at the initial end 11. The electromagnetic heating component 3 is used to heat the metal substrate of the electrode 7. The electromagnetic heating component 3 is equipped with a high-frequency electromagnetic coil. When the electrode 7 enters the main body 1, the electrode 7 forms a wrap angle with the roller. The roller flattens the electrode 7. The high-frequency electromagnetic coil converts the 20~40KHZ high-frequency current into a magnetic field. The generated magnetic field then forms an eddy current short circuit effect on the metal substrate of the electrode 7, so that the metal substrate of the electrode 7 can be heated to the set temperature instantly. The heating rate is increased by more than 25% compared with the traditional hot air oven.
[0031] See Figure 1 and Figure 2 The infrared heating component 4 is connected to the main body 1 and is located between the initial end 11 and the end 12. The infrared heating component 4 is used to heat the surface of the electrode 7, specifically, to heat the wet film of the electrode 7. After being heated by the electromagnetic heating component 3, the electrode 7 is transmitted from the initial end 11 into the main body 1. A large amount of heat is conducted from the inside of the metal substrate of the electrode 7 to the wet film of the electrode 7. At the same time, the infrared heating component 4 provides heat radiation heating and heat preservation to the surface of the wet film of the electrode 7, thereby achieving synchronous and coordinated heating of the inside and outside of the coating layer of the electrode 7. The drying efficiency is increased by more than 40% compared with the traditional unidirectional hot air oven. After being heated by the electromagnetic heating component 3 and the infrared heating component 4, the electrode 7 is output from the main body 1 through the end 12.
[0032] This application uses an electromagnetic heating component 3 in conjunction with an infrared heating component 4 to perform composite heating on the electrode 7. The electromagnetic heating component 3 first heats the inside of the electrode 7, causing the metal substrate of the electrode 7 to generate heat. The metal substrate transfers heat to the wet film of the electrode 7, and the inside of the wet film of the electrode 7 hardens and dries first. Then, the infrared lamp tube is used to radiate heat to heat the surface of the wet film. The electrode 7 will not have the risk of cracking. The inside and outside of the electrode 7 can be heated instantly, shortening the heating and drying time of the electrode 7. Compared with the traditional hot air drying system, the heating rate is increased by more than 25% and the drying rate is increased by more than 40%.
[0033] See Figure 1 and Figure 2 The main body 1 includes a base 13 and an upper shell 14. The upper shell 14 is located above the base 13. The base 13 and the upper shell 14 together form a heating channel. The base 13 and the upper shell 14 can be separated from each other. The electromagnetic heating component 3 and the infrared heating component 4 are located inside the heating channel. The initial end 11 is located at one end of the heating channel, and the end end 12 is located at the other end of the heating channel. When the staff needs to inspect the components inside the main body 1, the base 13 and the upper shell 14 can be separated to open the heating channel, making it convenient for the staff to inspect the roller assembly 2, the electromagnetic heating component 3 and the infrared heating component 4.
[0034] See Figure 1-3In some embodiments, the main body 1 includes a lifting mechanism 15, which is connected to the base 13 and the upper housing 14 respectively. The lifting mechanism 15 can drive the upper housing 14 to rise and fall. The roller assembly 2 is installed on the base 13, and the electromagnetic heating assembly 3 and the infrared heating assembly 4 are installed on the upper housing 14. When the staff needs to inspect the components inside the main body 1, the upper housing 14 can be raised by the lifting mechanism 15, and the staff can then extend the instrument between the upper housing 14 and the base 13 to detect whether the components inside the main body 1 can work normally. Alternatively, after the upper housing 14 is raised, the staff can directly observe whether the components inside the main body 1 are damaged. When the electrode composite heating and drying device needs to work, the upper housing 14 can be lowered by the lifting mechanism 15 so that the upper housing 14 abuts against the base 13, and the base 13 and the upper housing 14 close together to form a heating channel. Preferably, the lifting mechanism 15 includes a cylinder 151 and a guide rod 152. The cylinder body of the cylinder 151 is mounted on the base 13, and the piston rod of the cylinder 151 is connected to the upper housing 14. The guide rod 152 extends vertically, and its bottom end is fixed to the base 13. The guide rod 152 passes through the upper housing 14, ensuring that the upper housing 14 remains vertically aligned during lifting or lowering, preventing misalignment during the lifting process. The cylinder 151 drives the upper housing 14 to lift, eliminating the need for a traditional oven maintenance door. Furthermore, the opening and closing maintenance space for the upper housing 14 and the base 13 is larger, resulting in higher space utilization. When the electrode composite heating and drying device is in operation, the overall volume of the main body 1 is smaller.
[0035] See Figure 1 and Figure 4 The electromagnetic heating assembly 3 includes a height adjustment mechanism 31, an angle adjustment mechanism 32, and an electromagnetic transmitter 33. The height adjustment mechanism 31 is connected to the angle adjustment mechanism 32 and is used to adjust the height of the angle adjustment mechanism 32, thereby adjusting the relative height between the electromagnetic transmitter 33 and the electrode 7 in the transmission. The angle adjustment mechanism 32 is connected to the electromagnetic transmitter 33 and is used to adjust the angle of the electromagnetic transmitter 33 relative to the roller assembly 2, thereby adjusting the relative angle between the electromagnetic transmitter 33 and the electrode 7, ensuring that the electromagnetic transmitter 33 faces the electrode 7 in the transmission. The electromagnetic transmitter 33 is equipped with a high-frequency electromagnetic coil and is used to heat the metal substrate of the electrode 7.
[0036] See Figure 1 and Figure 4In some embodiments, the height adjustment mechanism 31 includes a fixed rod 311, a mounting bracket 312, and an adjusting bolt 314. The fixed rod 311 is connected to the main body 1 and is located inside the main body 1. The fixed rod 311 extends horizontally, and its two ends are respectively connected to the upper housing 14. The mounting bracket 312 has an elongated perforated hole 315 that extends vertically, through which the fixed rod 311 passes. The adjusting bolt 314 is installed on the top of the mounting bracket 312, with its head positioned above the mounting bracket 312, and passes through from top to bottom. Mounting bracket 312, the tail of adjusting bolt 314 abuts against the top of fixing rod 311, fixing rod 311 supports adjusting bolt 314 and thus supports mounting bracket 312; mounting bracket 312 is connected to angle adjustment mechanism 32; when it is necessary to adjust the height of electromagnetic transmitter 33, the extension of adjusting bolt 314 in the hollow hole 315 can be adjusted by rotating adjusting bolt 314, wherein the greater the extension of adjusting bolt 314 in the hollow hole 315, the higher electromagnetic transmitter 33 is; this design makes it convenient for operators to adjust the relative height of electromagnetic transmitter 33 and electrode 7 by rotating adjusting bolt 314.
[0037] See Figure 1 and Figure 4 The angle adjustment mechanism 32 includes a rotating frame 321 and a limiting bolt 322. One end of the rotating frame 321 is hinged to the mounting frame 312. The rotating frame 321 has an arc-shaped limiting hole 313. The center of the limiting hole 313 is located at the hinge between the rotating frame 321 and the mounting frame 312. The limiting bolt 322 is fixed to the mounting frame 312 and passes through the limiting hole 313. The rotating frame 321 is fixed to the electromagnetic transmitter 33. When it is necessary to adjust the relative angle between the electromagnetic transmitter 33 and the electrode 7, the operator can first loosen the limiting bolt 322, then rotate the rotating frame 321 to make the limiting bolt 322 slide relative to the limiting hole 313. After the electromagnetic transmitter 33 reaches the required angle, tighten the limiting bolt 322 so that the limiting bolt 322 presses the rotating frame 321 tightly onto the mounting frame 312. At this time, the rotating frame 321 stops rotating due to friction with the mounting frame 312, thereby fixing the relative angle between the electromagnetic transmitter 33 and the electrode 7. This design makes it easy for the operator to adjust the relative angle between the electromagnetic transmitter 33 and the electrode 7.
[0038] See Figure 1 and Figure 2The electrode composite heating and drying device also includes a dehumidification mechanism 5, which includes a dehumidification fan 51 and an air duct 52. A dehumidification port 16 is provided on the top of the main body 1. One end of the air duct 52 is connected to the dehumidification port 16. The dehumidification fan 51 is connected to the air duct 52. When the dehumidification fan 51 rotates, it can drive the airflow near the dehumidification port 16 into the air duct 52. Since the electrode 7 generates moisture during the heating process of the electromagnetic heating component 3 and the infrared heating component 4, the moisture will rise inside the main body 1. When the moisture reaches the dehumidification port 16, it will flow into the air duct 52 under the drive of the dehumidification fan 51, and then be discharged from the main body 1 through the end of the air duct 52 away from the dehumidification port 16. Preferably, the top of the main body 1 is an arched structure, and the exhaust port 16 is located at the top of the main body 1. Since the top of the main body 1 is an arched structure, when the moisture reaches the top inside the main body 1, the moisture is more likely to concentrate at the exhaust port 16, which makes it easier for the exhaust fan 51 to discharge the moisture out of the main body 1.
[0039] See Figure 1 and Figure 2 The main body 1 is equipped with a fresh air module 17, located below the roller assembly 2. The fresh air module 17 is used to supply fresh air into the main body 1. The fresh air can be air from outside the main body 1 or other gases that have been dried. By setting the fresh air module 17 in the main body 1, convection is facilitated within the main body 1, allowing the fresh air entering the main body 1 to carry away moisture and flow towards the exhaust port 16, thus facilitating the removal of moisture generated by the electrode 7. The fresh air module 17 can be a fresh air chamber with multiple air holes that communicate with the environment outside the main body 1. Air from outside the main body 1 can enter the fresh air chamber through the air holes and then flow from the fresh air chamber to the heating channel.
[0040] The electrode composite heating and drying device of this application does not have a complex hot air internal circulation system. Compared with traditional ovens, it eliminates components such as internal circulation heat exchangers, upper and lower air chambers, air nozzle dispersion system, hot oil control system, and circulating fan. The equipment volume of the electrode composite heating and drying device of this application is reduced by 35%, the equipment cost is reduced by more than 20%, and the equipment debugging and maintenance are extremely simple.
[0041] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.
[0042] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. An electrode sheet composite heating and drying device characterized by comprising: The utility model relates to a kind of electroplating equipment, including: Main body, the main body is equipped with initial end and end; Roller assembly, the roller assembly is connected with the main body, the roller assembly is used to drive pole piece from the initial end to the end; Electromagnetic heating assembly, the electromagnetic heating assembly is connected with the main body, the electromagnetic heating assembly is located in the initial end, and the electromagnetic heating assembly is used to heat the metal base material of pole piece; Infrared heating assembly, the infrared heating assembly is connected with the main body, the infrared heating assembly is located between the initial end and the end, and the infrared heating assembly is used to heat the surface of pole piece.
2. The pole piece composite heating drying apparatus according to claim 1, characterized by: The main body includes base and upper shell, and the upper shell is located above the base. The base and the upper shell form a heating channel. The electromagnetic heating assembly and the infrared heating assembly are located in the heating channel. The initial end is located at one end of the heating channel, and the end is located at the other end of the heating channel.
3. The pole piece composite heating drying apparatus of claim 2, wherein: The main body includes a lifting mechanism connected with the base and the upper shell respectively. The lifting mechanism drives the upper shell to lift. The roller assembly is installed on the base. The electromagnetic heating assembly and the infrared heating assembly are installed on the upper shell.
4. The pole piece composite heating drying apparatus of claim 3, wherein: The lifting mechanism includes a cylinder and a guide rod. The cylinder body is installed on the base. The piston rod of the cylinder is connected with the upper shell. The guide rod extends vertically. The bottom end of the guide rod is fixed to the base. The guide rod passes through the upper shell.
5. The pole piece composite heating drying apparatus of claim 1, wherein: The electromagnetic heating assembly includes a height adjusting mechanism, an angle adjusting mechanism and an electromagnetic emitter. The height adjusting mechanism is connected with the angle adjusting mechanism. The height adjusting mechanism is used to adjust the height of the angle adjusting mechanism. The angle adjusting mechanism is connected with the electromagnetic emitter. The angle adjusting mechanism is used to adjust the angle of the electromagnetic emitter relative to the roller assembly. The electromagnetic emitter is used to heat the metal base material of pole piece.
6. The pole piece composite heating drying apparatus of claim 5, wherein: The height adjusting mechanism includes a fixed rod, a mounting bracket and an adjusting bolt. The fixed rod is connected with the main body and located in the main body. The mounting bracket has a hollow hole. The fixed rod passes through the hollow hole. The adjusting bolt passes through the mounting bracket from top to bottom and abuts against the top end of the fixed rod. The mounting bracket is connected with the angle adjusting mechanism.
7. The pole piece composite heating drying apparatus of claim 6, wherein: The angle adjusting mechanism includes a rotating bracket and a limiting bolt. One end of the rotating bracket is hinged to the mounting bracket. The rotating bracket has an arc-shaped limiting hole. The center of the limiting hole is located at the hinge between the rotating bracket and the mounting bracket. The limiting bolt is fixed to the mounting bracket and passes through the limiting hole.
8. The pole piece composite heating drying apparatus of claim 1, wherein: It also includes a moisture removal mechanism. The moisture removal mechanism includes a moisture removal fan and an air pipe. The top of the main body has a moisture removal port. One end of the air pipe is connected with the moisture removal port. The moisture removal fan is connected to the air pipe.
9. The pole piece composite heating drying apparatus of claim 8, wherein: The top of the main body is an arc structure. The moisture removal port is located at the top end of the main body.
10. The pole piece composite heating drying apparatus of claim 1, wherein: The main body is equipped with a fresh air module. The fresh air module is located below the roller assembly. The fresh air module is used to provide fresh air into the main body.