Lithium battery isolating membrane drying equipment

Abstract

The lithium battery isolating membrane drying equipment comprises a box body and two sets of heat exchange systems, the two sets of heat exchange systems are arranged in the box body in parallel, the heat exchange system located on the upper portion is the first heat exchange system, and the first heat exchange system comprises a first sensible heat exchanger, a first air return pipeline and a first exhaust pipeline; the first exhaust pipeline comprises a first air pipe and a second air pipe, the first air pipe comprises a first air inlet face and a first air outlet face, the second air pipe comprises a second air inlet face and a second air outlet face, the first air inlet face is connected with the second end face, the first air outlet face is connected with the second air inlet face, and the second air outlet face is communicated with the first exhaust outlet. The air inlet area of the first air inlet face is larger than the air outlet area of the first air outlet face, the air outlet area of the first air outlet face is equal to the air inlet area of the second air inlet face, and the air inlet area of the second air inlet face is smaller than the air outlet area of the second air outlet face. The ventilation efficiency is improved, so that air can pass through the air duct more quickly, and the icing phenomenon is prevented.

Description

Technical Field

[0001] This application relates to the technical field of household appliances, and particularly to a drying device for lithium battery separator membranes. Background Art

[0002] With the rapid development of the new energy vehicle industry, as a core component of new energy vehicles, lithium batteries have a crucial impact on the performance of new energy vehicles. Therefore, the drying treatment of lithium battery materials has become an important link in improving the performance and quality of lithium batteries. As a result, the demand for lithium battery material drying equipment is increasing continuously. With the continuous progress and innovation of technology, the performance and quality of lithium battery material drying equipment are also constantly improving, providing strong support for the development of the lithium battery industry. However, in the existing drying devices, due to the too long air duct where the evaporator is installed, the fan speed ratio is insufficient, and icing is likely to occur, affecting the operation of the device. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide a drying device for lithium battery separator membranes, which designs the air inlet and outlet areas in the first exhaust air duct based on Bernoulli's principle to improve the ventilation efficiency of the air duct, enabling air to pass through the air duct faster and preventing icing.

[0004] To achieve the above purpose, this application adopts the following technical solutions:

[0005] On the one hand, a drying device for lithium battery separator membranes is provided, including: a box body and two heat exchange systems. The two heat exchange systems are arranged in parallel in the box body. The heat exchange system located above is the first heat exchange system. The first heat exchange system includes a first sensible heat exchanger, a first return air duct, and a first exhaust air duct. The first sensible heat exchanger includes a first end face and a second end face that are in communication. One end of the first return air duct is connected to a first return air inlet, and the other end is in communication with the first end face. One end of the first exhaust air duct is connected to a first exhaust air outlet, and the other end is in communication with the second end face;

[0006] The first exhaust air duct includes a first air duct and a second air duct. The first air duct includes a first air inlet surface and a first air outlet surface. The second air duct includes a second air inlet surface and a second air outlet surface. The first air inlet surface is connected to the second end face. The first air outlet surface is connected to the second air inlet surface. The second air outlet surface is in communication with the first exhaust air outlet. Among them, the air inlet area of the first air inlet surface is larger than the air outlet area of the first air outlet surface. The air outlet area of the first air outlet surface is equal to the air inlet area of the second air inlet surface. The air inlet area of the second air inlet surface is smaller than the air outlet area of the second air outlet surface.

[0007] Further, a first hem is formed by the periphery of the first air outlet surface extending outward, and a second hem is formed by the periphery of the second air inlet surface extending outward and is cooperatively connected with the first hem.

[0008] Further, a first evaporator is disposed in the second air duct.

[0009] Further, a first mounting hole for embedding the first evaporator is formed in the side surface of the second air duct.

[0010] Further, the first air outlet is installed at the top of the second air duct.

[0011] Further, the heat exchange system located below is a second heat exchange system. The second heat exchange system includes a second exhaust air duct. The second exhaust air duct is horizontally connected with a horizontally extending pipe. The horizontally extending pipe is vertically upward connected with a vertically extending pipe. The top of the vertically extending pipe is connected with a second air outlet, and the vertically extending pipe is staggered with the second air duct.

[0012] Further, the first air outlet and the second air outlet are arranged side by side.

[0013] Further, the second heat exchange system further includes a second sensible heat exchanger and a second return air duct. The second sensible heat exchanger includes a third end face and a fourth end face which are in communication. One end of the second return air duct is connected with a second air return opening, and the other end is communicated with the third end face. One end of the second exhaust air duct is connected with the horizontally extending pipe, and the other end is communicated with the fourth end face.

[0014] Further, the first air return opening and the second air return opening are arranged side by side.

[0015] Further, the first heat exchange system further includes a first fresh air duct and a first air outlet duct. The first sensible heat exchanger further includes a fifth end face and a sixth end face which are in communication. One end of the first fresh air duct is connected with a fresh air opening, and the other end is connected with the fifth end face. One end of the first air outlet duct is connected with an air outlet, and the other end is connected with the sixth end face.

[0016] The beneficial effects of the present application are as follows: Air enters the sensible heat exchanger through the first return air duct and undergoes heat exchange with the heat source, resulting in a significant temperature reduction. Subsequently, the cold air enters the carefully designed first exhaust air duct, which is formed by connecting the first air duct and the second air duct in series, creating an acceleration channel based on Bernoulli's principle. Inside the first air duct, since the air inlet area of the first air inlet surface is larger than the air outlet area of the first air outlet surface, according to Bernoulli's principle, the air flow velocity increases and the pressure decreases when passing through this section. Immediately afterwards, the air enters the second air duct at a relatively high flow velocity. At this time, the second air inlet surface with the same area as the first air outlet surface serves as a transition to maintain the stability of the flow velocity. However, inside the second air duct, due to the increase in cross-sectional area, the flow velocity slows down and the pressure increases accordingly. This pressure difference is an important power source in the air duct design and can drive the continuous flow of the fluid. During the process of connecting the first air duct to the second air duct, a form of first constriction and then expansion is used. In the constriction section, although the increase in flow velocity will bring certain energy losses (such as frictional losses), compared with the expansion section, this loss is usually small. At the same time, since the design of the expansion section helps the fluid to decelerate and recover part of the pressure energy, the overall energy loss can be effectively controlled. Moreover, the design of the first exhaust air duct with first constriction and then expansion helps the fluid to form a stable flow state inside the air duct, reducing the occurrence of unstable phenomena such as turbulence and eddy currents. This helps to improve the ventilation efficiency of the air duct and reduce the noise level, and can also avoid the icing phenomenon caused by low wind speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application will be further described in detail below with reference to the drawings and embodiments.

[0018] Figure 1 Internal schematic diagram of the lithium battery separator drying equipment according to the embodiment of the present application Figure 1 ;

[0019] Figure 2 Internal schematic diagram of the lithium battery separator drying equipment according to the embodiment of the present application Figure 2 ;

[0020] Figure 3 Three-dimensional view of the first exhaust air duct according to the embodiment of the present application;

[0021] Figure 4 Three-dimensional view of the first air duct according to the embodiment of the present application;

[0022] Figure 5 Three-dimensional view of the second air duct according to the embodiment of the present application.

[0023] In the figure: 1. Cabinet; 2. First heat exchange system; 201. First sensible heat exchanger; 202. First return air duct; 203. First exhaust duct; 204. First air outlet duct; 205. First exhaust air outlet; 206. First return air inlet; 207. First fresh air duct; 2031. First air duct; 2032. Second air duct; 2033. First air inlet surface; 2034. First air outlet surface; 2035. First hemming; 2036. Second air inlet surface; 2037. Second hemming; 2038. First mounting hole; 3. Second exhaust duct; 4. Second exhaust air outlet; 5. Horizontal extension pipe; 6. Vertical extension pipe. Detailed implementation manners

[0024] To make the technical problems solved by this application, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of this application.

[0025] In the description of this application, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In this application, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0027] As Figures 1 - 5As shown in the figure, this embodiment provides a drying device for a lithium battery separator membrane, including: a box body 1 and two heat exchange systems. The two heat exchange systems are arranged in parallel in the box body 1. The heat exchange system located above is the first heat exchange system 2. The first heat exchange system 2 includes a first sensible heat exchanger 201, a first return air duct 202 and a first exhaust air duct 203. The first sensible heat exchanger 201 includes a first end face and a second end face that are in communication. One end of the first return air duct 202 is connected with a first return air inlet 206, and the other end is communicated with the first end face. One end of the first exhaust air duct 203 is connected with a first exhaust air outlet 205, and the other end is communicated with the second end face;

[0028] The first exhaust air duct 203 includes a first air duct 2031 and a second air duct 2032. The first air duct 2031 includes a first air inlet surface 2033 and a first air outlet surface 2034. The second air duct 2032 includes a second air inlet surface 2036 and a second air outlet surface. The first air inlet surface 2033 is connected with the second end face. The first air outlet surface 2034 is connected with the second air inlet surface 2036. The second air outlet surface is communicated with the first exhaust air outlet 205. Among them, the air inlet area of the first air inlet surface 2033 is larger than the air outlet area of the first air outlet surface 2034. The air outlet area of the first air outlet surface 2034 is equal to the air inlet area of the second air inlet surface 2036. The air inlet area of the second air inlet surface 2036 is smaller than the air outlet area of the second air outlet surface.

[0029] Based on the above solution, the drying device reintroduces the dried air into the system through the first return air inlet 206. The return air enters the first sensible heat exchanger 201 through the first return air duct 202 for heat exchange, and forms air with a lower temperature and enters the first exhaust air duct 203. In the first air duct 2031, an innovative design is adopted in which the area of the first air inlet surface 2033 is larger than the area of the first air outlet surface 2034. According to Bernoulli's principle, when air passes through this reduced cross-section, the flow rate will naturally increase, and at the same time, the pressure will decrease. This design not only accelerates the air flow, but also effectively utilizes the principle of fluid dynamics and enhances the ventilation effect. Immediately afterwards, this cold air with an increased flow rate smoothly transitions from the first air outlet surface 2034 to the second air inlet surface 2036. The design with equal areas of the two ensures that the flow rate remains stable here, reducing the turbulent flow phenomenon that may be caused by sudden changes in the cross-section. After entering the second air duct 2032, although the second air outlet surface is larger than the second air inlet surface 2036 and the cross-sectional area increases, this design is not simply for deceleration, but for using the expansion section to recover part of the pressure energy and reduce energy loss. Although the flow rate will slow down at this stage, overall, the design of first constricting and then expanding makes the air flow in the air duct more stable and efficient.

[0030] It should be noted that the connection between the first air duct 2031 and the second air duct 2032 adopts a form of first constriction and then expansion. Although this design will cause certain energy losses in the constriction section, such as frictional losses, these losses are relatively small compared to the pressure energy recovery brought by the expansion section. More importantly, this design helps the fluid to form a laminar flow or a more stable flow state in the air duct, significantly reducing the occurrence of unstable phenomena such as turbulence and eddy currents, thereby further improving the ventilation efficiency of the air duct and reducing the noise level.

[0031] In summary, the design of the first exhaust air duct 203 in this application not only effectively prevents the icing phenomenon caused by too low air velocity, but also significantly improves the ventilation efficiency by optimizing the air duct structure and utilizing Bernoulli's principle, providing a more stable, efficient and reliable solution for the drying process of lithium battery separator membranes.

[0032] To enhance the connection strength and sealing performance between the first air duct 2031 and the second air duct 2032, a hemming structure is ingeniously introduced in this design. Specifically, the periphery of the first air outlet surface 2034 extends outward to form a first hem 2035. This design not only increases the edge thickness of the air outlet surface, but also provides a more stable foundation for its connection with subsequent components. At the same time, the periphery of the second air inlet surface 2036 also extends outward to form a second hem 2037 that precisely fits and connects with the first hem 2035. When the first air duct 2031 and the second air duct 2032 are assembled, the first hem 2035 and the second hem 2037 are closely attached, and the two are firmly connected through appropriate connection methods (such as welding, bolt fixation or special sealant, etc.). This connection method of hem fitting not only ensures the overall structural strength of the air duct system, but also effectively prevents air leakage at the connection, ensuring the continuity and stability of the internal air flow of the drying device.

[0033] In addition, the hemming design also has a certain compensation effect, which can absorb the minute deformations caused by thermal expansion and contraction of materials, processing errors or installation to a certain extent, thereby extending the service life of the air duct system and reducing the maintenance cost.

[0034] Further, a first evaporator is disposed within the second air duct 2032, and a first mounting hole 2038 for embedding the first evaporator is formed on the side surface of the second air duct 2032. During the process of air flowing through the second air duct 2032, it can further exchange heat with the first evaporator, thereby more effectively reducing the air temperature or increasing its humidity (depending on the specific type and working mode of the evaporator) to meet the specific requirements during the drying process of the lithium battery separator. To achieve the stable installation of the first evaporator, the first mounting hole 2038 matching the size of the evaporator is carefully formed on the side surface of the second air duct 2032. This mounting hole not only provides precise positioning and support for the embedding of the evaporator, but also ensures the close fit between the evaporator and the air duct, reducing the energy loss during the heat exchange process. During the installation process, the first evaporator is embedded into the second air duct 2032 through the first mounting hole 2038 and may be fastened using bolts, buckles or other special fixing parts to ensure its stability and reliability during operation. At the same time, to keep the air flow in the air duct unobstructed, the edge of the mounting hole is smoothed to avoid unnecessary obstruction to the air flow.

[0035] In some embodiments, the first air outlet 205 is installed at the top of the second air duct 2032. Placing the first air outlet 205 at the top of the second air duct 2032 can ensure that the air that has undergone sufficient heat exchange and acceleration can be directly and efficiently discharged, reducing the residence time in the air duct, thereby improving the drying efficiency; moreover, in a low-temperature environment, the top exhaust design also helps to reduce the risk of water accumulation and icing inside the air duct because when the hot air is discharged from the top, it will take away a part of the water vapor and heat, reducing the humidity and temperature of the bottom of the air duct and other low-temperature areas. In addition, the design of the first air outlet 205 at the top also makes the drying device more convenient for maintenance and cleaning, and maintenance personnel can more easily access and clean the first air outlet and the surrounding area to ensure the long-term stable operation of the equipment.

[0036] Furthermore, the heat exchange system located below is the second heat exchange system. The second heat exchange system includes a second exhaust duct 3. The second exhaust duct 3 is horizontally connected with a horizontally extending pipe 5. The horizontally extending pipe 5 is vertically connected with a vertically extending pipe 6 upward. The top of the vertically extending pipe 6 is connected with a second exhaust opening 4, and the position of the vertically extending pipe 6 is staggered from that of the second air duct 2032. Through the design of the horizontally extending pipe 5, without increasing the external space occupation of the box body 1, a spatial dislocation layout between the vertically extending pipe 6 and the second air duct 2032 can be realized, which helps to optimize the volume and spatial layout of the overall equipment and make it more compact. The existence of the horizontally extending pipe 5 makes the vertically extending pipe 6 staggered from the second air duct 2032, which can avoid direct conflict during exhaust, reduce air flow resistance, and thus improve the exhaust efficiency. Moreover, the design of the horizontally extending pipe can more flexibly control the exhaust direction and speed, which helps to more precisely adjust the air flow dynamics during the drying process. In addition, the design of the horizontally extending pipe can make the installation, maintenance and replacement of the vertically extending pipe more convenient.

[0037] At the same time, the vertical exhaust design helps to more effectively discharge moisture and hot air. Since hot air rising is a natural phenomenon, vertical exhaust can conform to this natural law, improve the exhaust efficiency, and also reduce the possibility of moisture and hot air flowing back into the drying device during the drying process, keeping the drying environment dry and clean. The design of the vertically extending pipe can make better use of space. Especially in drying equipment with multiple layers or limited space, the vertical layout can save valuable space, and the layout of the vertically extending pipe is usually easier to install and maintain because they can be conveniently operated from the top or side, reducing interference with other parts of the equipment.

[0038] Furthermore, the first exhaust opening 205 and the second exhaust opening 4 are arranged side by side. By arranging the first exhaust opening 205 and the second exhaust opening 4 side by side and ensuring that their positions are reasonably staggered from those of their respective heat exchange systems, the mutual interference of air flows between different systems can be reduced, which helps to maintain the stability and independence of the air flows inside their respective systems, further improving the drying efficiency and quality; and the exhaust direction is unified, which is beneficial to the discharge of air.

[0039] To enhance the flexibility and reliability of the drying device, a second heat exchange system is introduced. This system is basically the same as the first heat exchange system 2 in structure, but has independent operating capabilities and specific installation locations and exhaust structure designs. The second heat exchange system also includes a second sensible heat exchanger and a second return air duct. The second sensible heat exchanger has a conducting third end face and a fourth end face, which are respectively used to connect the second return air duct and the second exhaust duct 3. One end of the second return air duct is provided with a second return air inlet for sucking in the dried air or the preliminarily treated return air, and the other end is connected to the third end face of the second sensible heat exchanger to achieve the preliminary heat exchange of the air. The second exhaust duct 3 is connected to the horizontal extension pipe 5 at one end and to the fourth end face of the second sensible heat exchanger at the other end, forming a complete heat exchange and exhaust cycle. By setting up two basically identical heat exchange systems that operate independently, the drying efficiency is significantly improved. When the two systems work simultaneously, they can separately process the upper and lower layers of the lithium battery separator film, or adjust their respective working loads according to actual needs to achieve the best drying effect. At the same time, this design also enhances the redundancy of the system. Even if one of the heat exchange systems fails, the other system can still maintain the drying operation, ensuring the continuity and stability of the production line.

[0040] In addition, to further optimize the overall layout and air flow distribution, the first return air inlet 206 and the second return air inlet in this solution are designed to be arranged side by side. This layout helps to reduce the air flow interference and energy loss during the return air process and improve the return air efficiency. At the same time, the side-by-side return air inlets also make the drying device more neat and beautiful in appearance.

[0041] Generally, the first heat exchange system 2 further includes a first fresh air duct 207 and a first air outlet duct 204. The first sensible heat exchanger 201 further includes a fifth end face and a sixth end face that are in communication. One end of the first fresh air duct 207 is connected to a fresh air inlet, and the other end is connected to the fifth end face. One end of the first air outlet duct 204 is connected to an air outlet, and the other end is connected to the sixth end face. One end of the first fresh air duct 207 is connected to a fresh air inlet for introducing fresh air from the outside into the drying device. The fresh air inlet is usually located outside the device to facilitate obtaining clean and dry air from the surrounding environment. The other end of the fresh air duct is connected to the fifth end face of the first sensible heat exchanger 201 to ensure that fresh air can enter the sensible heat exchanger for preheating or cooling treatment. The first sensible heat exchanger 201 transfers heat through the heat exchange medium (such as metal plates, heat pipes, etc.) inside it. Its fifth end face is connected to the first fresh air duct 207 to receive fresh air from the outside, while the sixth end face is connected to the first air outlet duct 204 to send out the air after heat exchange treatment. One end of the first air outlet duct 204 is connected to the sixth end face of the first sensible heat exchanger 201 to receive the air after heat exchange treatment. The other end of the first air outlet duct 204 is connected to an air outlet for sending the heated air into the drying area to dry the lithium battery separator. The position and number of the air outlets are usually designed according to the specific layout of the drying area and the drying requirements to ensure that the air flow can evenly cover the entire drying area.

[0042] In the description of this article, it should be understood that the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of this application. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0043] In the description of this specification, the description referring to terms such as "one embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0044] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0045] The technical principles of the present application have been described above in connection with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art can readily conceive of other specific embodiments of the present application without creative efforts, and these embodiments will fall within the scope of protection of the present application.

Claims

1. A drying device for a lithium battery separator membrane, characterized in that, Including: A box body (1) and two sets of heat exchange systems. The two sets of heat exchange systems are arranged in parallel in the box body (1). The heat exchange system located above is the first heat exchange system (2). The first heat exchange system (2) includes a first sensible heat exchanger (201), a first return air duct (202), and a first exhaust duct (203). The first sensible heat exchanger (201) includes a first end face and a second end face that are in communication. One end of the first return air duct (202) is connected to a first return air inlet (206), and the other end is in communication with the first end face. One end of the first exhaust duct (203) is connected to a first exhaust outlet (205), and the other end is in communication with the second end face. The first exhaust duct (203) includes a first air duct (2031) and a second air duct (2032). The first air duct (2031) includes a first air inlet surface (2033) and a first air outlet surface (2034). The second air duct (2032) includes a second air inlet surface (2036) and a second air outlet surface. The first air inlet surface (2033) is connected to the second end face. The first air outlet surface (2034) is connected to the second air inlet surface (2036). The second air outlet surface is in communication with the first exhaust outlet (205). Among them, the air inlet area of the first air inlet surface (2033) is larger than the air outlet area of the first air outlet surface (2034). The air outlet area of the first air outlet surface (2034) is equal to the air inlet area of the second air inlet surface (2036). The air inlet area of the second air inlet surface (2036) is smaller than the air outlet area of the second air outlet surface.

2. The drying device for lithium battery separator membranes according to claim 1, wherein, A first flange (2035) extends outward from the periphery of the first air outlet surface (2034). A second flange (2037) that is cooperatively connected to the first flange (2035) extends outward from the periphery of the second air inlet surface (2036).

3. The drying device for the lithium battery separator according to claim 1, wherein A first evaporator is provided in the second air duct (2032).

4. The drying device for lithium battery separator membranes according to claim 3, wherein A first installation hole (2038) for embedding the first evaporator is provided on the side surface of the second air duct (2032).

5. The drying device for the lithium battery separator according to any one of claims 1-4, characterized in that, The first exhaust outlet (205) is installed at the top of the second air duct (2032).

6. The drying device for lithium battery separator membranes according to any one of claims 1-4, characterized in that, The heat exchange system located below is the second heat exchange system. The second heat exchange system includes a second exhaust duct (3). The second exhaust duct (3) is horizontally connected to a horizontally extending pipe (5). The horizontally extending pipe (5) is vertically connected upward to a vertically extending pipe (5). The top of the vertically extending pipe (5) is connected to a second exhaust outlet (4), and the vertically extending pipe (5) is offset from the position of the second air duct (2032).

7. The drying device for lithium battery separator membranes according to claim 6, wherein, The first exhaust outlet (205) and the second exhaust outlet (4) are arranged side by side.

8. The drying device for a lithium battery separator according to claim 6, characterized in that, The second heat exchange system further includes a second sensible heat exchanger and a second return air duct. The second sensible heat exchanger includes a third end face and a fourth end face that are in communication. One end of the second return air duct is connected to a second return air inlet, and the other end is in communication with the third end face. One end of the second exhaust duct (3) is connected to the horizontally extending pipe (5), and the other end is in communication with the fourth end face.

9. The drying device for lithium battery separator according to claim 8, characterized in that The first return air inlet (206) and the second return air inlet are arranged side by side.

10. The drying device for the lithium battery separator according to any one of claims 1-4, characterized in that, The first heat exchange system (2) further includes a first fresh air duct (207) and a first air outlet duct (204). The first sensible heat exchanger (201) further includes a fifth end face and a sixth end face that are in communication. One end of the first fresh air duct (207) is connected to a fresh air inlet, and the other end is connected to the fifth end face. One end of the first air outlet duct (204) is connected to an air outlet, and the other end is connected to the sixth end face.

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