Air box and coater oven

Abstract

This utility model discloses an air box and a coating machine oven. The air box includes a main body, which includes an air inlet guide section and a return air guide section. The air inlet guide section is located on both sides of the main body, and an air inlet duct is formed within it. At least one side of the outlet section of the air inlet duct is provided with an arc-shaped guide surface, which guides hot air to the workpiece to be dried. The return air guide section is located in the middle area of ​​the main body, and a return air duct is formed within it. This air box can reduce the risk of electrode belt vibration, improve heat transfer efficiency and drying uniformity, reduce heat loss and energy consumption, extend equipment maintenance cycle, improve structural reliability and airflow control accuracy, and reduce the difficulty of air balance adjustment.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production equipment technology, specifically to an air box used in a coating machine oven and a coating machine oven containing the air box. Background Technology

[0002] The coating process is one of the key steps in the production of lithium-ion battery electrodes. It involves uniformly coating an active material slurry onto the surface of a current collector (such as copper foil or aluminum foil), followed by drying in an oven to form the battery electrode. As the core component of the coating machine, the performance of the internal hot air circulation system of the oven directly affects the electrode drying efficiency, coating uniformity, and product yield.

[0003] In coating machine ovens, the air box is a key flow guiding component for achieving directional flow and circulation of hot air. In existing technologies, the air box in coating machine ovens typically adopts a basic layout of side air intakes and central air return, delivering hot air to the electrode surface and recovering residual heat through air ducts. However, the outlet section of the existing air box's air intake guiding structure has a sloping surface, which presents the following problems:

[0004] 1. Hot air blows from the inclined slits on both sides of the belt direction toward the electrode surface, which will cause the electrode belt to vibrate.

[0005] 2. The hot air rebounding from the surface of the electrode passes through the middle of the air box surface, and then escapes through the openings on both sides of the air box through the internal cavity. The purpose is to prevent heat accumulation in the middle area of ​​the electrode and cause overheating. However, this will cause the airflow in the oven to have multiple directions, resulting in airflow turbulence, and will also cause shaking of the electrode belt.

[0006] Therefore, there is an urgent need to improve and optimize the air box structure in the coating machine oven. Summary of the Invention

[0007] In order to overcome the defects in the prior art, the first objective of this utility model is to provide an air box inside a coating machine oven, and the second objective of this utility model is to provide a coating machine oven.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] In a first aspect, this application provides an air box inside a coating machine oven, comprising:

[0010] The main body includes an air inlet guide section and an air return guide section;

[0011] The air inlet guide is located on both sides of the main body. An air inlet duct is formed in the air inlet guide. At least one side of the outlet section of the air inlet duct is provided with an arc-shaped guide surface. The arc-shaped guide surface is used to guide the hot air flow to the part to be dried.

[0012] The return air guide section is located in the middle area of ​​the main body, and a return air duct is formed within the return air guide section.

[0013] The parts to be dried mainly refer to electrode sheets (such as positive or negative electrodes) coated with slurry during the lithium battery production process. The wet slurry coating on their surface needs to be dried and cured by hot air to form a stable coating. Furthermore, this structure can also be applied to other strip materials requiring drying coatings (such as films, paper, etc.), demonstrating its wide applicability. Electrode sheets and other materials typically pass through the oven in a continuous horizontal conveyor belt (e.g., moving from left to right). Their surface coatings are sensitive to airflow disturbances—vertical impacts can easily cause the electrode sheets to vibrate, affecting the uniformity of the coating thickness and even causing wrinkles. Therefore, a fan box structure is needed to precisely control the direction of the hot air.

[0014] This application utilizes a coordinated design of the inlet air guide section and the return air guide section to respectively undertake the functions of "hot air supply" and "return air recovery". The inlet air guide section is located on both sides of the main body, allowing hot air to be blown out symmetrically from both sides of the part to be dried (such as an electrode), avoiding uneven airflow caused by unilateral air supply. The arc-shaped guide surface of the outlet section guides the hot air to flow close to the surface of the part to be dried (rather than vertically impacting) through the Coanda effect (boundary effect) of the fluid, reducing the vertical impact force on the electrode and lowering the risk of belt vibration. The return air guide section is located in the middle area, which can directly recover the hot air flowing over the surface of the electrode, forming a closed-loop airflow path of "inlet-drying-return air", improving heat utilization efficiency, and avoiding turbulence interference with the drying process.

[0015] Furthermore, the layout of the air inlet guide section can be flexibly adjusted according to the width of the part to be dried (such as the electrode sheet). When the electrode sheet is narrow (such as a standard width electrode sheet), one set of air inlet guide sections can be set up. The lateral coverage of this set of guide sections matches the width of the electrode sheet, ensuring that the hot air evenly covers the surface of the electrode sheet. When the electrode sheet is wide, the main body can be extended synchronously along the length of the air box (i.e., the direction perpendicular to the electrode sheet's conveyor belt direction), and multiple sets of air inlet guide sections (each set contains two opposing air inlet guide sections) can be added within the extended section. This multi-set parallel air inlet guide section allows the hot air to cover different positions of the wide electrode sheet (such as the left, middle, and right areas) in different zones, avoiding uneven air delivery to the edge areas due to insufficient coverage of a single set of air inlet guide sections, thereby ensuring the drying consistency throughout the entire width of the electrode sheet and achieving rapid drying of the entire electrode sheet.

[0016] Optionally, the air inlet guide section includes two oppositely arranged arc-shaped guide surfaces.

[0017] The Coanda effect (wall adhesion effect) refers to the phenomenon that fluids (such as hot air) tend to adhere to curved surfaces during flow. The arc-shaped guide surface at the outlet section of the air duct in the air box utilizes this principle: when hot air flows out at high speed from the air duct, the airflow "adheres" to the curved surface of the guide surface and is ultimately directed out in a direction parallel to the electrode surface. This guiding method avoids the directional loss of control caused by the "free diffusion" of hot air in traditional direct-blowing air ducts, achieving precise action of hot air on the electrode coating surface.

[0018] The core advantages of the curved airflow guide surface are reflected in three dimensions: In terms of airflow pattern control, the curved surface guides the hot air into a uniformly diffused fan shape. Compared with traditional planar airflow guides, this guides the hot air to form a laminar flow effect, avoiding uneven heat distribution caused by turbulence. In terms of improved heat transfer efficiency, the curved surface geometry extends the contact path between the hot air and the electrode coating, causing the hot air to form a spiral flow trajectory between the airflow guide surface and the electrode, significantly improving heat transfer efficiency without increasing energy consumption. The optimized directional drying is based on the adhesion guiding principle, ensuring that the hot air flows along (or near) the electrode surface and fully contacts the wet coating, extending the heat exchange time and accelerating moisture evaporation. Compared with traditional direct-blowing air ducts, the curved airflow guide surface design can increase the drying rate of high-solids-content, thick coatings (such as lithium battery cathode electrodes) while reducing ineffective hot air diffusion, effectively reducing heat loss.

[0019] The air inlet guide section employs two opposing arc-shaped guide surfaces, meaning that both sides of the outlet section of the air inlet duct have arc-shaped structures. This allows for simultaneous guidance of hot air from both sides, creating a more concentrated and stable horizontal airflow at the outlet. Furthermore, the use of two opposing arc-shaped guide surfaces enhances the adaptability of the air inlet duct to hot air at varying velocities; even if the hot air velocity fluctuates, the two arc-shaped surfaces work together to stabilize the airflow direction.

[0020] Considering the potential for non-uniform airflow velocity within the intake duct, the two opposing arc-shaped guide surfaces employ a differentiated curvature design: the inner arc-shaped guide surface closer to the return air duct has a smaller radius of curvature and a steeper surface, while the outer arc-shaped guide surface farther from the return air duct has a larger radius of curvature and a gentler surface. The inner region has a higher airflow velocity, and the smaller curvature of the guide surface allows for stronger Coanda effect constraint, preventing airflow from detaching from the guide surface due to excessive velocity (i.e., airflow separation), ensuring stable flow of high-speed airflow along the guide surface. Conversely, the outer region has a lower airflow velocity, and the larger curvature of the guide surface provides weaker constraint, maintaining airflow adhesion while reducing unnecessary energy loss and flow resistance.

[0021] Optionally, given the harsh working conditions in which the coating machine oven is exposed to high temperature and high flow rate hot air for a long time and may carry slurry debris, the arc-shaped guide surface of this application may be made of wear-resistant and high-temperature resistant materials, such as stainless steel or nickel-based alloys.

[0022] Optionally, the angle between the tangent direction of the outlet end of the arc-shaped guide surface and the surface to be dried of the part to be dried is less than 15°. When the angle is less than 15°, the flow direction of the hot air is almost parallel to the electrode surface (the surface to be dried) (i.e., "horizontal guidance"), and the vertical component is minimal, which can avoid electrode shaking caused by vertical impact. Combined with the Coanda effect, the hot air flows close to the electrode surface, which can not only heat the coating evenly, but also reduce the disturbance of the airflow to the electrode, significantly improving the stability of the conveyor belt. When the angle is small (close to 0°), the hot air flows almost along the tangent direction of the surface to be dried, and uses the Coanda effect to sweep across the electrode surface, which can not only efficiently remove the moisture (or solvent) from the electrode surface, but also minimize the vertical impact force on the electrode. If the angle exceeds 15°, the hot air will generate a significant vertical thrust on the electrode, which may cause the electrode to shake up and down. For thin and easily deformable parts to be dried, such as lithium battery electrodes, an angle of less than 15° effectively avoids baking cracking caused by shaking. Further optionally, the angle can be adjusted according to the material of the part to be dried (for example, a slightly larger angle, such as 10-15°, is allowed for thicker electrode sheets; while for thinner electrode sheets, it can be controlled within 5°).

[0023] Strip materials such as electrodes typically move continuously within the drying oven (e.g., horizontally), and their wet surface coatings (e.g., lithium battery slurry) are extremely sensitive to airflow disturbances. If hot air impacts the electrode at a vertical angle (e.g., 90°), it generates a significant vertical force, causing the electrode to vibrate or even wrinkle, severely affecting the uniformity of the coating thickness. The arc-shaped guide surface, designed with an outlet tangent angle of less than 15° to the electrode surface to be dried, adjusts the hot air flow direction to be almost parallel to the electrode surface (horizontal guidance), significantly reducing the vertical force. This design reduces electrode vibration and significantly improves the stability of the conveyor belt.

[0024] Optionally, the end of the air inlet duct furthest from the part to be dried is the first inlet, and the end closest to the part to be dried is the first outlet. The cross-sectional dimension of the air inlet duct decreases from the first inlet to the first outlet.

[0025] According to Bernoulli's equation, reducing the cross-section will accelerate the airflow velocity, allowing hot air to reach the electrode surface at a higher speed and enhancing heat transfer efficiency. At the same time, the increased flow velocity can reduce the residence time of hot air in the air duct, reducing heat loss. In addition, the constriction design can balance the pressure distribution at different locations in the air duct, avoiding the problem of "high wind speed at the near end and low wind speed at the far end", ensuring that the hot air flow rate is consistent at all points along the belt direction of the electrode.

[0026] Optionally, the end of the return air duct closer to the part to be dried is the second inlet, and the end farther away from the part to be dried is the second outlet. The flow cross-sectional dimension of the return air duct decreases from the second inlet to the second outlet.

[0027] The constricted structure of the return air duct can gradually increase the flow rate of the return airflow, avoiding "airflow stagnation" and "local negative pressure" caused by excessively low flow rate during the return air process, and reducing turbulence. High-speed return air can quickly transport the heat-carrying airflow to the external return air device, shorten the heat circulation cycle, and reduce the overall energy consumption of the oven.

[0028] Optionally, an anti-clogging structure is provided at the inlet of the return air duct. During the electrode drying process, coating debris (such as incompletely cured slurry particles) may be generated, or dust from the environment may enter the duct with the return air, which can easily lead to duct blockage over time. Installing an anti-clogging structure at the return air inlet can intercept large particles of impurities, preventing them from entering the duct and extending the equipment maintenance cycle. This is particularly suitable for coating processes with large coating thickness and high slurry solid content. The anti-clogging structure can be detachably connected to the return air duct inlet (e.g., snap-fit ​​type) for easy periodic cleaning.

[0029] Optionally, the anti-clogging structure is a grid or a perforated plate.

[0030] Grilles (such as metal mesh) or perforated plates (such as perforated aluminum plates) are characterized by simple structure, low cost, and good airflow. The aperture can be adjusted according to actual needs, and the return air flow is not significantly affected while intercepting impurities. In practical applications, multi-layer composite structures (such as coarse grilles + fine filters) or non-stick coatings (such as polytetrafluoroethylene) can also be used to further improve the anti-clogging effect and ease of cleaning.

[0031] Optionally, the first inlet of the air inlet duct is used to connect to an external hot air supply device, and the second outlet of the air return duct is used to connect to an external air return device.

[0032] This feature clarifies the connection between the air box and external equipment, and is the key to forming a closed-loop air path of "active blowing + active return".

[0033] An external hot air supply device (such as a hot air furnace or blower) provides a stable supply of hot air to the air inlet duct through a first inlet, while an external return air device (such as a return air fan or heat exchanger) extracts the return air through a second outlet. Together, they form a closed loop: hot air flows from the supply device → air inlet duct → electrode surface → return air duct → return air device → (after heating) back to the supply device. The advantages of this closed-loop design are: reduced hot air loss (in traditional technologies, hot air escapes from both sides, resulting in a heat loss rate of 20%-30%, while the loss rate in a closed-loop system can be reduced to less than 5%), lowering energy consumption; and precise control of the air inlet and return volumes through external devices facilitates adjustment of the air balance within the oven, reducing reliance on manual adjustment (solving the problem of high requirements for manual air balance adjustment in existing technologies).

[0034] Optionally, the body is a one-piece molded structure. One-piece molding avoids the seam problems of assembling multiple parts, reduces the risk of air leakage, and improves the overall rigidity of the body. This process can ensure the accuracy of the cross-sectional dimensions of the air inlet and return air ducts and the curvature of the arc-shaped guide surface, avoiding uneven airflow distribution caused by processing errors.

[0035] Secondly, this application also provides a coating machine oven, including the air box described in any of the above.

[0036] By adopting the above-mentioned air box structure, the oven can achieve a closed-loop process of "uniform air supply - stable drying - efficient return air", which solves the problems of electrode shaking and uneven coating drying caused by uneven airflow in traditional ovens; it is especially suitable for high-precision coating scenarios such as lithium battery electrodes, which can improve the electrode yield and reduce production costs.

[0037] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0038] 1. By setting an arc-shaped guide surface at the outlet section of the air inlet guide, the Coanda effect of the fluid is used to guide the hot air to flow closely to the surface of the workpiece to be dried, reducing the vertical impact force on the electrode, reducing the risk of electrode belt shaking, and effectively avoiding the problem of baking cracking caused by shaking.

[0039] 2. The air inlet guide is located on both sides of the body, which allows hot air to be blown out symmetrically from the left and right sides of the workpiece to be dried, avoiding uneven airflow caused by unilateral air supply. Combined with the fact that the angle between the tangent direction of the arc-shaped guide surface outlet end and the surface to be dried of the workpiece is less than 15°, it further ensures that the hot air acts on the electrode surface in a nearly parallel direction, improving the stability of the belt conveyor.

[0040] 3. The cross-sectional dimensions of the air inlet duct decrease from the first inlet to the first outlet. According to Bernoulli's equation, this accelerates the airflow velocity, enhances heat transfer efficiency, reduces the residence time of hot air in the duct to reduce heat loss, and balances the pressure distribution in the duct to ensure that the hot air flow rate is consistent at all points along the belt direction of the electrode.

[0041] 4. The return air guide section is located in the middle area of ​​the main body, which can directly recover the hot air flowing over the surface of the electrode, forming a closed-loop airflow path of "air inlet-drying-return air". The cross-sectional size of the return air duct decreases from the second inlet to the second outlet, which can increase the return airflow velocity, avoid airflow stagnation and local negative pressure, reduce turbulence, shorten the heat circulation cycle, and reduce the overall energy consumption of the oven.

[0042] 5. The return air duct inlet is equipped with an anti-clogging structure, which can intercept large particles of impurities, avoid duct blockage, and extend the equipment maintenance cycle. It is especially suitable for coating processes with large coating thickness and high slurry solid content.

[0043] 6. The first inlet of the air inlet duct is connected to the external hot air supply device, and the second outlet of the return air duct is connected to the external return air device, forming a stable closed-loop air path for active blowing and active return air, reducing heat loss from hot air dissipation and lowering the requirement for manual adjustment of the air balance inside the oven.

[0044] 7. The main body adopts a one-piece molding structure to avoid the seam problem of multi-part assembly, thereby reducing the risk of air leakage and improving the overall rigidity of the main body. At the same time, it ensures the cross-sectional dimensions of the air inlet and return air ducts and the curvature accuracy of the arc-shaped guide surface, avoiding uneven airflow distribution caused by processing errors.

[0045] 8. The layout of the air inlet guide can be flexibly adjusted according to the width of the part to be dried. By setting one or more sets of air inlet guides, hot air can be evenly covered on the surface of electrode sheets of different widths, ensuring the drying consistency in the entire width direction of the electrode sheet, realizing the rapid drying of the entire electrode sheet, and is applicable to a variety of strip materials that require drying coatings, such as lithium battery electrodes, films, and paper, with wide applicability.

[0046] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the wind box structure in Embodiment 1 of this utility model. Figure 1 ;

[0049] Figure 2This is a schematic diagram of the wind box structure in Embodiment 1 of this utility model. Figure 2 ;

[0050] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0051] Figure 4 This is a schematic cross-sectional view of the wind box structure in Embodiment 1 of this utility model. Figure 1 ;

[0052] Figure 5 This is a schematic cross-sectional view of the wind box structure in Embodiment 1 of this utility model. Figure 2 .

[0053] The reference numerals in the above figures are as follows: 1. Body; 2. Electrode; 11. Air inlet guide section; 111. First guide section; 1111. First plane; 1112. First arc-shaped guide surface; 112. Second guide section; 1121. Second plane; 1122. Second arc-shaped guide surface; 113. Air inlet duct; 114. First inlet; 115. First outlet; 12. Return air guide section; 121. Third guide section; 122. Fourth guide section; 123. Perforated plate; 124. Return air duct; 125. Second inlet; 126. Second outlet. Detailed Implementation

[0054] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0055] Example 1: See Figure 1 , 2 As shown, an air box inside a coating machine oven includes a body 1, which includes an air inlet guide section 11 and a return air guide section 12. Two air inlet guide sections 11 are located on opposite sides of the body 1 in the width direction. The return air guide section 12 is located in the middle region of the body 1 between the two air inlet guide sections 11. An air inlet duct 113 is formed within the air inlet guide section 11, and at least one side of the outlet section of the air inlet duct 113 has an arc-shaped guide surface for guiding hot air flow towards the workpiece to be dried, which may be a lithium battery electrode 2. A return air duct 124 is formed within the return air guide section 12.

[0056] In an optional embodiment, the body 1 can be manufactured using a one-piece molding process, such as stainless steel injection molding. Compared to a multi-part splicing structure, this effectively reduces the risk of air leakage caused by assembly seams, while also improving the overall rigidity of the body 1. This process can also precisely control the cross-sectional dimensions of the air inlet duct 113 and the return air duct 124, as well as the curvature accuracy of the arc-shaped guide surface, avoiding uneven airflow distribution caused by processing errors and ensuring the stability of hot air guidance.

[0057] In practical applications, the conveyor path of electrode 2 can be aligned with the length direction of body 1, and the surface of electrode 2 to be dried is opposite to the lower surface of body 1.

[0058] See Figure 4 , 5 As shown, in an optional embodiment, the air inlet guide section 11 is composed of a first guide section 111 and a second guide section 112, with an air inlet duct 113 formed between them. The first guide section 111 is located away from the return air guide section 12, and the second guide section 112 is located close to the return air guide section 12.

[0059] The inlet section of the first guide section 111 is a vertically arranged first plane 1111, and the outlet section is a first arc-shaped guide surface 1112. One end of the arc-shaped guide surface is connected to the first plane 1111, and the other end extends downward and bends towards the return air guide section 12. The inlet section of the second guide section 112 also has a vertical second plane 1121, but its length is shorter than that of the first plane 1111. One end of the second arc-shaped guide surface 1122 of the outlet section is connected to the second plane 1121, and the other end extends downward and bends towards the return air guide section 12, so that the entire second arc-shaped guide section arches towards the first guide section 111, and approaches a horizontal state at the end facing away from the second plane 1121.

[0060] Influenced by the shapes of the first guide section 111 and the second guide section 112, the cross-section of the air inlet duct 113 is approximately rectangular in the inlet section; as it extends towards the outlet section, it gradually narrows into a slit under the action of the arc-shaped guide surfaces on both sides, and this slit eventually tends to be horizontal. Thus, a first inlet 114 is formed at the top of the first plane 1111 and the second plane 1121, and hot air flows into the air inlet duct 113 from above through this inlet, becoming the starting input point for the drying airflow circulation. See also Figure 3 As shown, the bottoms of the first arc-shaped guide surface 1112 and the second arc-shaped guide surface 1122 form the first outlet 115. The hot air, guided by the arc-shaped guide surfaces, flows out in a near-horizontal manner. At this time, the hot air flows parallel or nearly parallel to the surface of the electrode 2, which can effectively act on the coating of the electrode 2 for drying, promotes more uniform coverage of the electrode 2 surface by the hot air, and significantly improves the drying effect and efficiency.

[0061] In an optional embodiment, the first arc-shaped guide surface 1112 and the second arc-shaped guide surface 1122 are made of stainless steel to adapt to the harsh working conditions of high temperature, high flow rate hot air in the oven and the possibility of carrying slurry debris. Their surfaces are polished to reduce resistance during airflow.

[0062] In an optional embodiment, the angle between the tangent directions at the outlet ends of the first arc-shaped guide surface 1112 and the second arc-shaped guide surface 1122 and the surface of the electrode 2 to be dried is less than 10°, and the second angle between the tangent direction at the outlet end of the second arc-shaped guide surface 1122 and the surface of the electrode 2 to be dried is less than the first angle between the tangent direction at the outlet end of the first arc-shaped guide surface 1112 and the surface of the electrode 2 to be dried. This angle setting ensures that the flow direction of the hot air is almost parallel to the surface of the electrode 2, with minimal vertical force component, thus avoiding vibration of the electrode 2 caused by vertical impact. Combined with the Coanda effect, the hot air can flow closely to the surface of the electrode 2, ensuring uniform heating of the coating and reducing airflow disturbance to the electrode 2, significantly improving the stability of the conveyor belt.

[0063] In an alternative implementation, when the electrode 2 is a thinner negative electrode 2, the included angle can be adjusted to 5° to further reduce the vertical impact force on the electrode 2 and minimize the vibration amplitude of the electrode 2; if the electrode 2 is a thicker positive electrode 2, the included angle can be maintained at 10° to ensure the stability of the belt conveyor while taking into account the heat exchange efficiency.

[0064] In one optional embodiment, the return air guide section 12 adopts a symmetrical structure, including a third guide section 121 and a fourth guide section 122 arranged opposite to each other. An anti-clogging structure is connected to one end of each guide section near the first outlet 115, and a return air duct 124 is formed between the third guide section 121 and the fourth guide section 122. Both the third guide section 121 and the fourth guide section 122 are planar plate structures, with their tops close together and their bottoms separated, thus forming a second outlet 126 at the top and a second inlet 125 at the bottom. The cross-sectional dimension of the return air duct 124 decreases along the airflow direction (i.e., from the second inlet 125 to the second outlet 126).

[0065] Specifically, the anti-clogging structure can be a perforated plate 123, which can effectively block foreign objects from entering the air duct while ensuring smooth airflow.

[0066] In an optional embodiment, the first inlet 114 of the air inlet duct 113 is used to connect to an external hot air supply device to provide a heat source for the drying process; the second outlet 126 of the return air duct 124 is connected to an external return air device to realize the recycling of hot air, thereby forming a stable closed-loop air path of active blowing and active return air, reducing the heat loss of hot air and reducing the requirement for manual adjustment of the air balance inside the drying oven.

[0067] This embodiment further discloses a coating machine oven, which, by integrating the aforementioned air box, can achieve efficient and stable hot air circulation during the drying process of lithium battery electrode 2.

[0068] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. An air box within a coater oven, characterized by, include: The main body includes an air inlet guide section and an air return guide section; The air inlet guide is located on both sides of the main body. An air inlet duct is formed in the air inlet guide. At least one side of the outlet section of the air inlet duct is provided with an arc-shaped guide surface. The arc-shaped guide surface is used to guide the hot air flow to the part to be dried. The return air guide section is located in the middle area of ​​the main body, and a return air duct is formed within the return air guide section.

2. The air box within a coater oven of claim 1, wherein, The air inlet guide section includes two oppositely arranged arc-shaped guide surfaces.

3. The air box inside the coating machine oven according to claim 1 or 2, characterized in that, The angle between the tangent direction at the outlet end of the arc-shaped guide surface and the surface of the part to be dried is less than 15°.

4. The air box within a coater oven of claim 1, wherein, The end of the air inlet duct furthest from the part to be dried is the first inlet, and the end closest to the part to be dried is the first outlet. The cross-sectional dimension of the air inlet duct decreases from the first inlet to the first outlet.

5. The air box within a coater oven of claim 1, wherein, The end of the return air duct closest to the part to be dried is the second inlet, and the end furthest from the part to be dried is the second outlet. The cross-sectional dimension of the return air duct decreases from the second inlet to the second outlet.

6. The air box inside the coating machine oven according to claim 1, characterized in that, The inlet of the return air duct is equipped with an anti-clogging structure.

7. The air box within a coater oven of claim 6, wherein, The anti-clogging structure is a grille or a perforated plate.

8. The air box within a coater oven of claim 1, wherein, The first inlet of the air intake duct is used to connect to an external hot air supply device, and the second outlet of the return air duct is used to connect to an external return air device.

9. The air box within a coater oven of claim 1, wherein, The main body is a one-piece molded structure.

10. A coater oven characterized by, Includes the wind box as described in any one of claims 1-9.

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