Coating oven and coating machine based on hot air extraction controllability

Abstract

The utility model discloses a kind of coating oven and coating machine based on hot air extraction controllable, coating oven includes cabinet, is provided with first air outlet, first air outlet is used to discharge the gas of already dried pole piece to cabinet outside;Air supply device, including the air outlet of being set on the air outlet chamber of cabinet and being set on air outlet chamber, the cavity space of air outlet chamber gradually decreases away from the direction of the air inlet end of air outlet chamber, air outlet is used for the dry hot air output for pole piece;Uniform air device, it is set on cabinet, uniform air device includes the first slow-flow plate of being set with air outlet chamber same side, first slow-flow plate allows the gas of already dried pole piece to pass. Coating machine applies the above-mentioned coating oven.

Description

Technical Field

[0001] This utility model relates to the field of electrode drying technology, and in particular to a coating oven and coating machine based on controllable hot air extraction. Background Technology

[0002] In the lithium-ion battery electrode coating process, the coating oven is one of the core pieces of equipment, used to dry the electrodes coated with slurry. Drying is typically achieved by outputting hot air through nozzles, and its performance directly affects the drying quality and production efficiency. However, in conventional ovens, the airflow from the nozzles flows out from both sides of the electrode, and the airflow from different nozzles all exits from the same vent on the side wall of the oven. This results in long airflow paths, heat waste, and turbulence caused by collisions between multiple airflows within the oven, leading to electrode vibration and affecting the coating effect. To alleviate this vibration problem, a common solution is to install two sets of hot air vents spaced apart above and below the electrode. However, after the hot air vents reach the electrode surface, the airflow adheres to the surface for a certain distance along the length of the electrode before gradually flowing away along the sides. Furthermore, when the hot air supply device delivers hot air, the airflow velocity gradually decreases as the hot air flows from the supply end to multiple output ends in the air chamber due to the delivery distance. This results in a significant pressure difference between the supply end and the output end located furthest from the supply end, causing uneven hot air distribution inside the oven and affecting the drying efficiency and quality of the electrode sheets. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a coating oven and coating machine based on controllable hot air extraction, wherein the coating machine utilizes the coating oven provided in this application. The coating oven provided in this application has the advantages of reducing heat loss, suppressing turbulence formation, improving the uniformity of hot air distribution, and increasing drying efficiency.

[0004] In a first aspect, the coating oven based on controllable hot air extraction according to an embodiment of the present invention includes:

[0005] The housing is equipped with a first exhaust vent, which is used to exhaust the gas from the dried electrode sheets to the outside of the housing.

[0006] An air supply device includes an air outlet chamber disposed on a housing and an air outlet disposed on the air outlet chamber. The cavity space of the air outlet chamber gradually decreases along the direction away from the air inlet end of the air outlet chamber, and the air outlet is used to output dry hot air to the electrode.

[0007] An air distribution device is installed on the housing. The air distribution device includes a first flow damper plate arranged on the same side as the air outlet chamber. The first flow damper plate allows the gas from the dried electrode to pass through.

[0008] The coating oven based on controllable hot air extraction according to the embodiments of this utility model has at least the following beneficial effects: The air supply device of the coating oven includes an air outlet chamber and an air outlet disposed on the air outlet chamber. The air outlet is used to output drying hot air to the electrode sheets. After the fresh air enters the air outlet chamber, it flows from one end of the air outlet chamber space to the other end of the air outlet chamber space. During the flow of the gas, some of the gas flows into the air outlet on the air outlet chamber and is output to the surface of the electrode sheets waiting to be dried in the oven. However, due to the large difference in airflow velocity at both ends of the air outlet chamber caused by the gas flowing into the air outlet during the flow of the gas, there will be a large difference in the air pressure and air volume blown onto the surface of the electrode sheets, resulting in uneven surface drying of the electrode sheets during the conveying and drying process, which affects the quality of the electrode sheets. Therefore, this application redesigns the space inside the air outlet chamber according to the setting position of the first air outlet of the chamber. At the same time, a uniform air distribution device is set in the oven to further improve the environment of the electrode heating zone of the oven, so that the electrode heating zone can achieve uniform heating of the electrode sheets, thereby improving the drying efficiency and quality of the electrode sheets. Specifically, the cavity space of the air outlet chamber gradually decreases along the direction away from the air inlet end, with the air inlet end of the air outlet chamber located at the end with the largest space. It should be noted that the electrode conveying direction mentioned in this application is... Figure 1The direction indicated by the middle arrow F. It can be understood that the airflow is greatest at the inlet side near the outlet chamber, and gradually decreases as some gas flows into the outlet. To ensure flow rate, the volume of the outlet chamber gradually decreases from right to left. That is, the gradually decreasing airflow, combined with the gradually decreasing space, allows the airflow to maintain a consistent velocity within the decreasing space, balancing the air pressure inside the chamber. This ensures a stable and uniform airflow velocity at the outlet, resulting in more even heating of the electrode surface. After the drying hot air removes moisture from the electrode surface, it exits through the first exhaust vent. Because the first exhaust vent is located at one end of the chamber, the hot air carrying moisture has a longer path at the end farther from the first exhaust vent, while the hot air carrying moisture has a shorter path at the end closer to the first exhaust vent. This leads to uneven heat distribution and pressure imbalance within the oven, resulting in quality problems and low drying efficiency in the electrode drying process. To address this issue, this application also includes an air-uniformation device to further improve the uneven heating environment inside the oven. The air-uniformation device includes a first flow-regulating plate with a flow-regulating section. When hot, dry air is output from the air outlet and blows onto the electrode sheets, carrying away moisture from the surface of the sheets, the hot air carrying moisture flows through the flow-regulating section to the first exhaust port and is discharged to the outside of the oven. Because the flow-regulating section gradually reduces the airflow output along the electrode sheet conveying direction, it achieves gradient control of the airflow in the electrode sheet heating zone. That is, the airflow near the first exhaust port is lower than the airflow further away, thus balancing the air pressure in the electrode sheet heating zone. Simultaneously, combined with the special design of the exhaust chamber, it ensures uniform heat distribution in the electrode sheet heating zone, preventing uneven drying on both sides of the electrode sheet and improving the quality of the electrode sheet.

[0009] According to the coating oven based on hot air extraction controllable according to the present utility model embodiment, the first flow plate includes a flow-slowing part, which is located on both sides of the air outlet. The flow-slowing part includes a plurality of first flow-slowing holes, which allow the gas of the dried electrode to pass through.

[0010] The diameter of the first slow-flow orifice gradually decreases in the direction away from the first exhaust port;

[0011] And / or,

[0012] The distribution density of the first slow-flow orifice gradually increases in the direction away from the first exhaust port.

[0013] According to the present invention, a coating oven based on controllable hot air extraction has two air outlet chambers, which are arranged opposite each other on both sides of the electrode. The air outlets of the two air outlet chambers deliver dry hot air toward the electrode. Two first flow buffers are arranged opposite each other on both sides of the electrode, and the two first flow buffers and the oven body form an electrode heating zone.

[0014] According to an embodiment of the present invention, in a coating oven with controllable hot air extraction, the air outlets of the two air outlet chambers are staggered along the conveying direction of the electrode sheet.

[0015] According to the present invention, the coating oven based on hot air extraction controllable coating oven includes an air supply device that further includes a nozzle assembly connected to the air outlet, the nozzle assembly being used to output dry hot air to the electrode sheet.

[0016] According to the present invention, a coating oven based on hot air extraction controllable coating oven includes an air nozzle assembly comprising an upper air nozzle and a lower air nozzle disposed opposite to each other on both sides of the electrode sheet. The upper air nozzle includes an air outlet cavity, an air outlet opening communicating with the air outlet cavity, and a diversion assembly. The diversion assembly is disposed in the air outlet cavity and close to the air outlet opening, and the diversion assembly can divide the air outlet opening to form multiple slit-type air outlet channels.

[0017] According to an embodiment of the present invention, a coating oven based on controllable hot air extraction has a flow distribution component including a first flow distribution element and a second flow distribution element. A plurality of first flow distribution elements are arranged at intervals along the radial direction of the air outlet opening. The second flow distribution elements are disposed between the first flow distribution elements. The inner wall of the nozzle housing and the outer wall of the adjacent first flow distribution element form a first air outlet channel, and the outer wall of the second flow distribution element and the outer wall of the adjacent first flow distribution element form a second air outlet channel.

[0018] According to the coating oven based on hot air extraction controllable according to the present utility model embodiment, the first air outlet channel and the second air outlet channel are both inclined, and the airflow output from the first air outlet channel and the airflow output from the adjacent second air outlet channel can approach and converge with each other.

[0019] Alternatively, both the first and second air outlet channels are inclined, allowing the airflow output from the first air outlet channel to approach and converge with the airflow output from the adjacent second air outlet channel and the airflow output from the second air outlet channels located on both sides of the first diverter.

[0020] According to an embodiment of the present invention, a coating oven based on controllable hot air extraction is provided in the air outlet cavity, and the second flow buffer is located between the air inlet end of the air outlet cavity and the first air outlet channel and the second air outlet channel. The second flow buffer is provided with a plurality of second flow buffer holes through which airflow can pass.

[0021] According to the coating oven based on controllable hot air extraction according to the present utility model embodiment, one or both of the first and second diverter are provided with a partition plate between them and the second buffer plate. The partition plate is used to divide the air outlet cavity into multiple sub-air outlet cavities, and the sub-air outlet cavities are connected to the first air outlet channel and the second air outlet channel.

[0022] According to the present invention, the coating oven based on hot air extraction controllable according to an embodiment of the present invention further includes a return air device, including a return air chamber disposed on the oven body and a return air inlet disposed on the upper air nozzle. The return air chamber is connected to the return air inlet, and the return air inlet is used to discharge the turbulence formed by the convergence of airflow between the air outlet channels to the return air chamber.

[0023] According to an embodiment of the present invention, a coating oven based on controllable hot air extraction has an upper air nozzle with a return air chamber communicating with the return air chamber. The return air chamber has a return air inlet and a return air outlet. The return air inlet allows turbulent flow formed by the convergence of airflows to pass through and enter the return air chamber. The return air outlet is used to discharge the gas in the return air chamber to the return air chamber.

[0024] According to an embodiment of the present invention, a coating oven based on controllable hot air extraction further includes a negative pressure suction device, a return air chamber is provided with a second exhaust port, the negative pressure suction device is connected to the second exhaust port, and the second exhaust port is used to discharge gas from the return air chamber.

[0025] Secondly, the coating machine according to the embodiments of the present invention utilizes the aforementioned coating oven.

[0026] The coating machine according to the embodiments of this utility model has at least the following beneficial effects: the coating machine improves the drying efficiency and quality of the electrode sheets by applying the coating oven provided in this application. Specifically, the air supply device of the coating oven includes an air outlet chamber and an air outlet disposed on the air outlet chamber. The air outlet is used to output drying hot air to the electrode sheets. After the fresh air enters the air outlet chamber, it flows from one end of the air outlet chamber space to the other end of the air outlet chamber space. During the flow of the gas, some of the gas flows into the air outlet on the air outlet chamber and is output to the surface of the electrode sheets waiting to be dried in the oven. However, due to the large difference in airflow velocity at both ends of the air outlet chamber caused by the gas flowing into the air outlet during the gas flow process, there will be a large difference in the air pressure and air volume blown onto the surface of the electrode sheets, resulting in uneven surface drying of the electrode sheets during the conveying and drying process, which affects the quality of the electrode sheets. Therefore, this application redesigns the space inside the air outlet chamber according to the location of the first air vent of the chamber. Simultaneously, an air distribution device is installed inside the oven to further improve the environment of the electrode heating zone, enabling uniform heating of the electrodes and improving drying efficiency and quality. Specifically, the cavity space of the air outlet chamber gradually decreases in size from the air inlet end, with the air inlet end located at the end with the largest space. It should be noted that the electrode conveying direction mentioned in this application is... Figure 1The direction indicated by the middle arrow F. It can be understood that the airflow is greatest at the inlet end near the outlet chamber, and gradually decreases as some gas flows into the outlet. To ensure flow rate, the gradually decreasing airflow, combined with the gradually decreasing space, allows the airflow velocity to be maintained during the flow within the decreasing space, achieving a balanced gas distribution within the chamber. This ensures a stable and uniform airflow velocity at the outlet, resulting in more even heating of the electrode surface. After the drying hot air removes moisture from the electrode surface, it exits from the first exhaust vent of the chamber. Because the first exhaust vent is located at one end of the chamber, the hot air carrying moisture has a longer path at the end farther from the first exhaust vent, while the hot air carrying moisture has a shorter path at the end closer to the first exhaust vent. This leads to uneven heat distribution and pressure imbalance within the oven, resulting in quality problems and low drying efficiency in the electrode drying process. Therefore, this application also includes an air distribution device to further improve the uneven heating environment inside the oven. The air distribution device includes a first flow-regulating plate with a flow-regulating section. When hot, dry air is output from the air outlet and blows onto the electrode sheet, carrying away the moisture on the electrode sheet surface, the hot air carrying moisture flows through the flow-regulating section and then flows to the first exhaust port and is discharged to the outside of the oven. Because the flow-regulating section gradually reduces the airflow output along the electrode sheet conveying direction, it achieves gradient control of the airflow in the electrode sheet heating zone. That is, the airflow from the area near the first exhaust port to the first exhaust port is lower than the airflow from the area away from the first exhaust port, thereby balancing the air pressure in the electrode sheet heating zone. At the same time, combined with the special design of the air outlet chamber, the heating environment in the electrode sheet heating zone is made uniform in heat, avoiding uneven drying on both sides of the electrode sheet and improving the quality of the electrode sheet.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a front view of the internal structure of a coating oven with controllable hot air extraction according to an embodiment of the present invention.

[0030] Figure 2 This is a side view of the internal structure of a coating oven with controllable hot air extraction according to an embodiment of the present invention.

[0031] Figure 3 This is a partial cross-sectional view of a coating oven based on controllable hot air extraction, according to an embodiment of the present invention.

[0032] Figure 4This is an axonometric view of a partial structure of a coating oven based on controllable hot air extraction, according to an embodiment of the present invention.

[0033] Figure 5 This is an overall axonometric view of a coating oven based on controllable hot air extraction according to an embodiment of the present invention;

[0034] Figure 6 This is a first-view structural diagram of the upper air nozzle according to an embodiment of the present utility model;

[0035] Figure 7 for Figure 6 A magnified view of the area marked A;

[0036] Figure 8 This is a second-view structural diagram of the upper air nozzle according to an embodiment of the present utility model;

[0037] Figure 9 for Figure 8 Enlarged view of part marked B;

[0038] Figure 10 This is a cross-sectional view of the first embodiment of the upper air nozzle of this utility model;

[0039] Figure 11 This is a cross-sectional view of a second embodiment of the upper air nozzle of this utility model;

[0040] Figure 12 This is a diagram showing the airflow path from the nozzle output through the first buffer plate.

[0041] Explanation of reference numerals in the attached figures:

[0042] Electrode heating zone 1;

[0043] Enclosure size 100; First exhaust vent size 110;

[0044] Air outlet 200; air outlet 210; air inlet 220;

[0045] First flow-slowing plate 300; Flow-slowing section 310; First flow-slowing hole 311;

[0046] Upper air nozzle 400; air nozzle housing 410; air outlet cavity 411; first flow divider 420; return air inlet 421; return air cavity 422; first flow guide 423; second flow guide 424; return air outlet 430; second flow divider 440; first air outlet channel 450; second air outlet channel 460; second flow buffer 470; second flow buffer hole 471; partition plate 480;

[0047] Downwind nozzle 500;

[0048] Return air chamber 600; second air vent 610. Detailed Implementation

[0049] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0050] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0052] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0053] Reference Figures 1 to 12 This utility model provides a coating oven based on controllable hot air extraction, including a chamber 100, an air supply device, an air distribution device, and a return air device disposed on the chamber 100. The coating oven provided in this application achieves optimized hot air flow path and turbulence suppression through the coordinated design of the chamber 100, the air supply device, the air distribution device, and the return air device.

[0054] Specifically, such as Figures 1 to 5 As shown, the air supply device includes an air outlet chamber 200 and an air outlet 210 disposed on the air outlet chamber 200. The air outlet 210 is used to output dry hot air to the electrode. It should be noted that the air supply device also includes a fresh air input mechanism (not shown) for inputting fresh air into the air outlet chamber 200. The fresh air input mechanism (not shown) is connected to the air inlet 220 of the air outlet chamber 200. This application provides two air outlet chambers 200, located above and below the electrode respectively. Both air outlet chambers 200 simultaneously supply dry hot air to the electrode to improve drying efficiency.

[0055] In this design, the air inlet of the air outlet chamber 200 is located at one end of the chamber. This means that after fresh air enters the air outlet chamber 200, it flows from one end to the other. During this flow, some gas flows into the air outlet 210 and is then output to the surface of the electrode sheets awaiting drying inside the oven. However, due to the significant difference in airflow velocity between the two ends of the air outlet chamber 200 caused by the gas flowing into the air outlet 210, the air pressure and volume blowing onto the electrode surface vary considerably. This results in uneven drying of the electrode sheets during transport and drying, affecting their quality. Therefore, this application redesigns the space within the air outlet chamber 200 according to the electrode sheet transport direction. Simultaneously, a uniform airflow device is installed inside the oven to further improve the environment of the electrode heating zone 1, enabling uniform heating of the electrode sheets and improving drying efficiency and quality.

[0056] Specifically, such as Figure 1 As shown, the cavity space of the air outlet chamber 200 gradually decreases along the direction away from the air inlet end, with the air inlet end of the air outlet chamber 200 located at the end with the largest space. That is, it can be understood that the closer to the air inlet end of the air outlet chamber 200, the larger the cavity space of the air outlet chamber 200. It should be noted that the electrode conveying direction mentioned in this application is... Figure 1 The direction pointed to by the middle arrow F.

[0057] Understandably, the airflow is highest near the inlet side of the air outlet 200, and gradually decreases as some gas flows into the outlet 210 away from the inlet side of the air outlet 200. To ensure flow rate, such as Figure 1 As shown, the volume of the air outlet chamber 200 gradually decreases from right to left. That is, the gradually decreasing airflow, combined with the gradually decreasing space, enables the gradually decreasing airflow to maintain the airflow velocity during the flow of the gradually decreasing space, thereby balancing the air pressure inside the housing 100. This ensures that the airflow velocity from the air outlet 210 is stable, guarantees the uniformity of the airflow velocity, and makes the electrode surface more evenly heated. After the dry hot air carries away the moisture on the electrode surface, it is discharged from the first air outlet 110 of the housing 100.

[0058] Furthermore, such as Figure 1 and Figure 5 As shown, since the first exhaust vent 110 of the chamber 100 is located at one end of the chamber 100, the hot air carrying moisture at the end farther from the first exhaust vent 110 has a longer path, while the hot air carrying moisture at the end closer to the first exhaust vent 110 has a shorter path. This results in uneven heat distribution and unbalanced air pressure inside the oven, leading to quality problems and low drying efficiency in the electrode drying process. Therefore, this application also includes an air distribution device to further improve the uneven heating environment inside the oven.

[0059] Specifically, such as Figure 12 As shown, the air distribution device includes a first flow-regulating plate 300 with a flow-regulating section 310, and two flow-regulating sections 310 are respectively disposed on both sides of the air outlet chamber 200. The two first flow-regulating plates 300 are located above and below the electrode, respectively, referring to the reference. Figure 1 As shown, the two first flow-damping plates 300 and the two air outlet chambers 200 cooperate to form the electrode heating zone 1.

[0060] Specifically, such as Figure 12 As shown, the flow-retarding section 310 is provided with a plurality of first flow-retarding holes 311, and the first flow-retarding holes 311 are distributed in a matrix manner, and the aperture of the first flow-retarding holes 311 gradually decreases along the electrode conveying direction.

[0061] Understandably, when dry hot air is output from the air outlet 210 and blows on the electrode, taking away the moisture on the surface of the electrode, the hot air carrying moisture flows through the first slow flow hole 311 and then flows to the first exhaust port 110 and is discharged to the outside of the oven. Since the aperture of the first slow-flow hole 311 on the slow-flow section 310 gradually increases in the direction away from the first exhaust port 110, the slow-flow section 310 forms a gradually changing aperture structure. That is, it can be understood that the distribution density of the first slow-flow hole 311 on the slow-flow section 310 remains unchanged, but the aperture of the first slow-flow hole 311 closer to the first exhaust port 110 is smaller. This achieves gradient control of the airflow in the electrode heating zone 1. That is, the airflow from the area near the first exhaust port 110 to the first exhaust port 110 is lower than the airflow from the area away from the first exhaust port 110. This makes the air pressure in the electrode heating zone 1 balanced. At the same time, combined with the special design of the air outlet chamber 200, the heating environment of the electrode heating zone 1 is made uniform, avoiding uneven drying on both sides of the electrode and improving the quality of the electrode.

[0062] Alternatively, in some other embodiments of this application, the distribution density of the first flow-slowing holes 311 on the flow-slowing section 310 gradually decreases in the direction away from the first exhaust port 110. That is, it can be understood that the aperture of the first flow-slowing holes 311 is uniform, but the closer to the first exhaust port 110, the fewer the number of first flow-slowing holes 311 are provided on the flow-slowing section 310, and the lower the distribution density. The difference in the distribution density of the first flow-slowing holes 311 is used to control the gas flow rate when passing through the first flow-slowing plate at different positions inside the box, thereby achieving gas pressure balance in the electrode heating zone 1, making the heating environment of the electrode heating zone 1 uniform, avoiding uneven drying on both sides of the electrode, and improving the quality of the electrode.

[0063] Alternatively, in some other embodiments of this application, the diameter of the first flow-slowing holes 311 on the flow-slowing section 310 gradually increases in the direction away from the first exhaust port 110, while the distribution density of the first flow-slowing holes 311 on the flow-slowing section 310 gradually decreases in the direction away from the first exhaust port 110. That is, it can be understood that the diameter of the first flow-slowing holes 311 on the flow-slowing section 310 is smaller the closer it is to the first exhaust port 110, and the number of first flow-slowing holes 311 is less the closer it is to the first exhaust port 110, and their distribution density gradually decreases.

[0064] This application does not specifically limit the shape of the first slow-flow hole 311.

[0065] like Figure 12 As shown, this application provides a first embodiment of a first flow-retarding plate 300. Specifically, the first flow-retarding plate 300 includes a body and a flow-retarding section 310 disposed on the body. The flow-retarding section 310 is composed of a plurality of first flow-retarding holes 311. The body does not have first flow-retarding holes 311 in the middle, but only has through holes through which the nozzle can pass. When the dry hot air output by the nozzle carries away the moisture on the surface of the electrode, the hot air carrying moisture cannot pass directly through the middle of the first flow-retarding plate 300 and is forced to flow to the first flow-retarding holes 311 on both sides, and then flows to the first exhaust port 110 through the first flow-retarding holes 311, thereby reducing the heat loss of the electrode heating zone 1.

[0066] Alternatively, this application provides a second embodiment (not shown) regarding the first flow-retardant plate 300. Two first flow-retardant plates 300 are configured corresponding to one air outlet chamber 200, with the two first flow-retardant plates 300 positioned on opposite sides of the pair of air outlet chambers 200. The space between the upper and lower air outlet chambers 200 forms the electrode heating zone 1. Specifically, first flow-retardant holes 311 are evenly distributed on the body of the first flow-retardant plate 300 to form a flow-retardant section 310. When the dry hot air output from the nozzle carries away the moisture on the electrode surface, the hot air carrying moisture cannot flow from the air supply device to the first exhaust port 110, but is forced to flow through the first flow-retardant holes 311 on both sides, and then through the first flow-retardant holes 311 to the first exhaust port 110, thereby reducing heat loss in the electrode heating zone 1.

[0067] According to some embodiments of this application, the air supply device further includes a nozzle assembly connected to the air outlet 210, the nozzle assembly being used to output dry hot air to the electrode. Wherein, as Figure 1 As shown, the nozzle assembly includes an upper nozzle 400 and a lower nozzle 500 disposed opposite each other on both sides of the electrode. Correspondingly, the upper nozzle 400 is connected to the air outlet 210 located above the electrode, and the lower nozzle 500 is connected to the air outlet 210 located below the electrode. The nozzle assembly precisely delivers hot drying air to the surface of the electrode, improving the drying quality and efficiency of the electrode.

[0068] Furthermore, such as Figure 1As shown, the upper air nozzle 400 and the lower air nozzle 500 are staggered along the electrode conveying direction so that the airflow in the electrode heating zone 1 covers the electrode surface more comprehensively, reducing drying blind spots. In addition, the staggered design can also prevent the airflow from directly hitting the same position of the electrode, reducing the risk of local overheating, making the heating of each area of ​​the electrode surface more even, improving the consistency of coating thickness. Furthermore, the upper air nozzle 400 and the lower air nozzle 500 act on the surface drying of the electrode simultaneously, effectively shortening the drying time and improving production efficiency.

[0069] Specifically, such as Figure 10 As shown, the upper air nozzle 400 includes a nozzle housing 410, an air outlet cavity 411, an air outlet opening communicating with the air outlet cavity 411, and a diversion component. The diversion component is disposed in the air outlet cavity 411 and close to the air outlet opening. The diversion component can divide the air outlet opening to form multiple slit-type air outlet channels.

[0070] Understandably, the air outlet cavity 411 of the upper air nozzle 400 divides the air outlet opening into multiple slit-type air outlet channels through the flow splitting component, outputting laminar hot air and achieving multi-point precise air delivery in the width direction of the electrode. Furthermore, the slit design can reduce turbulence generation and improve the uniformity of airflow on the electrode surface.

[0071] Specifically, the diversion assembly includes a first diversion element 420 and a second diversion element 440. A plurality of first diversion elements 420 are arranged at intervals along the radial direction of the air outlet opening. The second diversion elements 440 are disposed between the first diversion elements 420. The inner wall of the nozzle housing 410 and the outer wall of the adjacent first diversion element 420 form a first air outlet channel 450. The outer wall of the second diversion element 440 and the outer wall of the adjacent first diversion element 420 form a second air outlet channel 460.

[0072] like Figure 10 As shown, this application provides a first embodiment of the upper air nozzle 400. Specifically, the air outlet cavity 411 is provided with two first diverter members 420 and one second diverter member 440. The second diverter member 440 is located between the two first diverter members 420. The outer wall of one side of the first diverter member 420 forms a first air outlet channel 450 with the inner wall of the air outlet cavity 411, while the outer wall of the second diverter member 440 forms a second air outlet channel 460 with the outer wall of the adjacent first diverter member 420, so that the air outlet opening forms four slit-type air outlet channels.

[0073] Of course, this application does not specifically limit the design quantity of the first diverter 420 and the second diverter 440. Specifically, the width of the air outlet 210 of the multi-slit air outlet electrode drying nozzle can be selected according to the width of the electrode in actual production. Correspondingly, the design quantity of the first diverter 420 and the second diverter 440 is also selected according to the width of the electrode.

[0074] Therefore, you can refer to Figure 11 The second embodiment of the upper air nozzle 400 provided in this application is shown. Specifically, as shown in the figure, a plurality of first and second diverter components 440 are provided in the air outlet cavity 411. The first diverter components 420 and the second diverter components 440 are staggered along the width direction of the air outlet 210. The outer wall of one side of the first diverter components 420 located at the beginning and end forms a first air outlet channel 450 with the inner wall of the air outlet cavity 411, while the outer wall of the second diverter component 440 forms a second air outlet channel 460 with the outer wall of the adjacent first diverter component 420. The staggered arrangement of the plurality of first diverter components 420 and second diverter components 440 makes the air outlet opening form a plurality of slit-type air outlet channels to accommodate the drying of electrode sheets with a large width.

[0075] like Figure 6 and Figure 3 As shown, the synergistic effect of the more than 400 channels in the upper nozzle provided in this application enables the output airflow to form a dense array of slits at the air outlet, achieving full coverage of the electrode width direction. Furthermore, the nested structure design of the first diverter 420 and the second diverter 440 significantly improves the uniformity of airflow while maintaining the compactness of the nozzle.

[0076] Furthermore, such as Figure 10 As shown, both the first air outlet channel 450 and the second air outlet channel 460 are inclined, allowing the airflow from the first air outlet channel 450 and the airflow from the adjacent second air outlet channel 460 to approach and converge. That is, it can be understood that when the airflows from the first air outlet channel 450 and the second air outlet channel 460 approach and converge, a continuous, covering dry airflow band can be formed in the width direction of the electrode, avoiding insufficient drying in the middle area caused by traditional side-mounted air outlets.

[0077] Similarly, as Figure 11 As shown, when there are multiple second air outlet channels 460, the second air outlet channels 460 located on both sides of the first diverter 420 in the middle are mirrored, so that the airflow output from the second air outlet channels 460 on both sides of the first diverter 420 in the middle can also converge, forming a multi-layer converged airflow network, which enhances the coverage intensity of each position in the width direction of the electrode. By making the output airflow converge, it not only prevents the drying blind zone caused by airflow dispersion, but also avoids local overheating caused by excessive airflow in one direction, thereby achieving a precise and controllable drying effect.

[0078] Turbulence is generated when airflows converge. Due to the thinness of the electrode sheet, turbulence can easily cause the electrode sheet to vibrate during the drying process, affecting the drying quality. Therefore, this application also includes a return air device. As shown in the figure, the return air device includes a return air chamber 600, a return air cavity 422, and a return air outlet 421 communicating with the return air cavity 422. The return air cavity 422 is located on the upper air nozzle 400, and the return air cavity 422 is provided with a return air outlet 430. Specifically, as shown... Figure 8 As shown, the return air outlet 430 is provided on the nozzle housing 410, and the two return air outlets 430 are respectively located at both ends of the return air cavity 422 to discharge the turbulence in the return air cavity 422 to the outside of the nozzle.

[0079] Understandably, when the airflows from the first air outlet 450 and the second air outlet 460 converge, they collide due to the different directions of the airflows, resulting in turbulence. The turbulence formed in the convergence area can promptly enter the return air cavity 422 from the return air inlet 421 and exit from the return air outlet 430 to the outside of the nozzle, flowing towards the return air chamber 600, thus preventing disorderly diffusion of turbulence in the nozzle's outlet area. The return air cavity 422, acting as a turbulence collection space, forms a directional flow path with the return air inlet 421, concentrating and exporting turbulence that disrupts the stability of the main airflow. This maintains the laminar flow characteristics of the main air outlet and achieves physical isolation of interfering airflow through an independent cavity structure, effectively improving the controllability of the drying airflow and enhancing the accuracy of airflow control during electrode drying.

[0080] Furthermore, such as Figures 2 to 5 As shown, the return air chamber 600 is equipped with a second exhaust vent 610 to discharge the gas awaiting moisture from the return air chamber 600 into the oven. As a further improvement, a negative pressure suction device (not shown) is installed outside the oven, and the negative pressure suction device (not shown) is connected to the second exhaust vent 610. Negative pressure suction enhances the turbulent discharge efficiency and reduces the impact on the electrode sheets.

[0081] In particular, in the second embodiment of the upper air nozzle 400, a return air structure is also provided between the two second air outlet channels 460 to ensure that the airflow output from each air outlet channel maintains a predetermined angle and flow rate, thereby improving the uniformity of heating on the electrode surface.

[0082] According to some embodiments of this application, such as Figure 10 As shown, the first diverter 420 has a hollow structure to form a return air cavity 422, and a return air inlet 421 is provided near the air outlet of the first diverter 420, as... Figure 7As shown, multiple return air inlets 421 are arranged in a matrix. The return air cavity 422 is directly formed using the hollow structure inside the first diverter 420, achieving spatial reuse of the turbulence collection device and the diverter structure, simplifying the internal structure of the nozzle. The matrix arrangement of the return air inlets 421 near the air outlet opening allows turbulence in the intersection area of ​​each air outlet channel to be captured at multiple points with high density, avoiding turbulence residue caused by traditional single-point return air. Through structural optimization of the first diverter 420 itself, the airflow guiding function of the main air outlet channel is ensured, while a distributed layout of the turbulence discharge channels is achieved, effectively improving the ability to eliminate interference from complex airflow.

[0083] Furthermore, such as Figure 10 As shown, the first diverter 420 is provided with two first guide sections 423. The two first guide sections 423 are inclined and arranged opposite to each other. The first guide sections 423 are used to guide the airflow in the air outlet cavity 411 to the first air outlet channel 450 and the second air outlet channel 460. That is, when the airflow flows from the air outlet chamber 200 into the air outlet cavity 411 through the air outlet 210, the airflow in the air outlet cavity 411 is guided by the first guide sections 423 and flows to the first air outlet and the second air outlet channel 460. The inclined angle design of the first guide sections 423 can change the airflow direction, so that the airflow enters the air outlet channel along a predetermined path and avoids disorderly diffusion of airflow; the arrangement of the two first guide sections 423 opposite to each other can produce a symmetrical guiding effect, balance the airflow pressure on both sides of the channel, and ensure that the airflow velocity and flow rate of each air outlet channel tend to be consistent. Each first guide section 423 acts independently on its corresponding air outlet channel, achieving precise airflow guidance through physical separation, thereby eliminating the airflow imbalance phenomenon that is easily generated in traditional single guide structures.

[0084] Furthermore, such as Figure 10 As shown, the second diverter 440 has a triangular structure. Two second guide sections 424 are formed on the two inclined surfaces of the second diverter 440. The first guide section 423 and the second guide section 424 form a double guide section structure, achieving precise control of the airflow in the second air outlet channel 460. When the airflow enters the air outlet cavity 411, guided by the first guide section 423, part of the airflow is guided and transported to the inlet end of the second air outlet channel 460. The staggered height arrangement between the first diverter 420 and the second diverter 440 creates an airflow buffer zone at the inlet end of the second air outlet channel 460, preventing vortex phenomena caused by sudden changes in direction and ensuring that the airflow enters the second air outlet channel 460 in a stable state. After being guided by the second guide section 424, the airflow path changes and enters the second air outlet channel 460.

[0085] According to some embodiments of this application, such as Figure 10As shown, a second flow-damping plate 470 is also provided inside the air outlet cavity 411. Specifically, the second flow-damping plate 470 is located between the air inlet end of the air outlet cavity 411 and the first air outlet channel 450 and the second air outlet channel 460. Furthermore, the flow-damping plate is provided with a plurality of second flow-damping holes 471 through which airflow can pass, and the second flow-damping holes 471 are distributed in a matrix.

[0086] Understandably, the airflow entering the outlet cavity 411 is first slowed down by the second flow deceleration plate 470 before flowing into the first outlet channel 450 and the second outlet channel 460. By setting the second flow deceleration plate 470 with second flow deceleration holes 471 between the air inlet end of the outlet cavity 411 and the outlet channel, the flow velocity of the original airflow after entering the outlet cavity 411 can be reduced, achieving deceleration and homogenization of the airflow. The second flow deceleration plate 470 is located upstream of the airflow in the outlet cavity 411, and its second flow deceleration hole 471 structure can divide the high-speed airflow entering the outlet cavity 411 into multiple fine airflows, effectively reducing local differences in airflow velocity. The distribution design of the second flow deceleration holes 471 allows the airflow to complete preliminary pressure equalization before entering the subsequent diversion channels, avoiding pressure imbalance on both sides of the diversion component caused by airflow impact.

[0087] Furthermore, a partition plate 480 is connected to the second flow-damping plate 470. For example... Figure 10 As shown, one end of the partition plate 480 is fixedly connected to the flow-damping plate, and the other end is fixedly connected to the first flow divider 420. By utilizing the partition plate 480, the air outlet cavity 411 is further divided into multiple independent sub-cavities, each corresponding to a specific air outlet channel, ensuring the independence of airflow supply to each channel and preventing mutual interference between airflows in different areas. It can be understood that when airflow enters the air outlet cavity 411 from the inlet end, it first passes through the second flow-damping hole 471 of the second flow-damping plate 470, where the high-speed airflow is dispersed into multiple low-speed airflows, significantly reducing turbulence intensity. The partition plate 480 further distributes the rectified airflow to different sub-air outlet cavities, each corresponding to a specific first air outlet channel 450 or second air outlet channel 460. Since the sub-air outlet cavities are completely isolated, the airflow parameters of each air outlet channel do not interfere with each other; for example, flow velocity and pressure can remain independent and stable. When airflow enters the corresponding air outlet channel through the sub-air outlet cavity, the directional delivery path ensures that the airflow forms a continuous and uniform coverage in the electrode width direction.

[0088] Optionally, in some other embodiments of this application, a partition plate 480 may be provided between the first diverter 420 and the second buffer plate 470, or between the second diverter 440 and the second buffer plate 470.

[0089] Furthermore, such as Figure 10As shown, the inner diameter of the sub-outlet cavity gradually decreases along the airflow direction. That is, it can be understood that the sub-outlet cavity has a conical, stepped, or trapezoidal contraction structure. The gradually contracting structure of the sub-outlet cavity forms a Venturi effect through cross-sectional changes, which improves flow stability while maintaining airflow velocity, and ultimately achieves uniform coverage of the multi-slit outlet airflow on the surface of pole 1.

[0090] Optionally, the downwind nozzle 500 has the same structure as the upwind nozzle 400.

[0091] According to some embodiments of this application, this application also provides a coating machine (not shown in the figure) that uses the above-mentioned coating oven to realize integrated production of electrode coating and drying. The uniform air and temperature control technology of the coating oven provided by this application can reduce the electrode defect rate and improve battery consistency.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A coating oven based on controllable hot air extraction, characterized in that, include: The housing (100) is provided with a first exhaust port (110), which is used to exhaust the gas of the dried electrode to the outside of the housing (100); An air supply device includes an air outlet chamber (200) disposed on the housing (100) and an air outlet (210) disposed on the air outlet chamber (200). The cavity space of the air outlet chamber (200) gradually decreases along the direction away from the air inlet end of the air outlet chamber (200). The air outlet (210) is used to output dry hot air to the electrode. An air distribution device is installed on the housing (100). The air distribution device includes a first flow damper (300) arranged on the same side as the air outlet chamber (200). The first flow damper (300) allows the gas from the dried electrode to pass through.

2. The coating oven based on controllable hot air extraction according to claim 1, characterized in that, The first flow-retarding plate (300) includes a flow-retarding section (310), which is located on both sides of the air outlet (210). The flow-retarding section (310) includes a plurality of first flow-retarding holes (311), which allow the gas of the dried electrode to pass through. The diameter of the first slow-flow hole (311) gradually decreases in the direction away from the first exhaust port (110); And / or, The distribution density of the first slow-flow hole (311) gradually increases in the direction away from the first exhaust port (110).

3. The coating oven based on controllable hot air extraction according to claim 2, characterized in that, Two air outlet chambers (200) are provided, and the two air outlet chambers (200) are arranged opposite each other on both sides of the electrode. The air outlets (210) of the two air outlet chambers (200) deliver dry hot air toward the electrode. The two first flow buffers (300) are arranged opposite each other on both sides of the electrode. The two first flow buffers (300) and the housing (100) surround the electrode heating zone (1).

4. The coating oven based on controllable hot air extraction according to claim 3, characterized in that, The air outlets (210) of the two air outlet chambers (200) are staggered along the conveying direction of the electrode sheet.

5. The coating oven based on controllable hot air extraction according to claim 1, characterized in that, The air supply device also includes a nozzle assembly connected to the air outlet (210), which is used to output dry hot air to the electrode.

6. The coating oven based on controllable hot air extraction according to claim 5, characterized in that, The nozzle assembly includes an upper nozzle (400) and a lower nozzle (500) disposed opposite to each other on both sides of the electrode. The upper nozzle (400) includes a nozzle housing (410), an air outlet cavity (411) disposed on the nozzle housing (410), an air outlet opening communicating with the air outlet cavity (411), and a diversion component. The diversion component is disposed in the air outlet cavity (411) and close to the air outlet opening. The diversion component can divide the air outlet opening to form multiple slit-type air outlet channels.

7. The coating oven based on controllable hot air extraction according to claim 6, characterized in that, The diversion assembly includes a first diversion element (420) and a second diversion element (440). A plurality of first diversion elements (420) are arranged at intervals along the radial direction of the air outlet opening. The second diversion element (440) is disposed between the first diversion elements (420). The inner wall of the nozzle housing (410) and the outer wall of the adjacent first diversion element (420) form a first air outlet channel (450). The outer wall of the second diversion element (440) and the outer wall of the adjacent first diversion element (420) form a second air outlet channel (460).

8. The coating oven based on controllable hot air extraction according to claim 7, characterized in that, Both the first air outlet channel (450) and the second air outlet channel (460) are inclined, and the airflow output from the first air outlet channel (450) and the airflow output from the adjacent second air outlet channel (460) can approach and converge with each other; Alternatively, both the first air outlet channel (450) and the second air outlet channel (460) are inclined, and the airflow output from the first air outlet channel (450) and the airflow output from the adjacent second air outlet channel (460) and the airflow output from the second air outlet channel (460) located on both sides of the first diverter (420) can approach and converge with each other.

9. The coating oven based on controllable hot air extraction according to claim 7, characterized in that, The air outlet cavity (411) is provided with a second flow-damping plate (470). The second flow-damping plate (470) is located between the air inlet end of the air outlet cavity (411) and the first air outlet channel (450) and the second air outlet channel (460). The second flow-damping plate (470) is provided with a plurality of second flow-damping holes (471) through which airflow can pass.

10. The coating oven based on controllable hot air extraction according to claim 9, characterized in that, One or both of the first diverter (420) and the second diverter (440) are provided with a partition plate (480) between them and the second buffer plate (470). The partition plate (480) is used to divide the air outlet cavity (411) into multiple sub-air outlet cavities. The sub-air outlet cavities are connected to the first air outlet channel (450) and the second air outlet channel (460).

11. The coating oven based on controllable hot air extraction according to claim 6, characterized in that, It also includes a return air device, including a return air chamber (600) disposed on the housing (100) and a return air inlet (421) disposed on the upper air nozzle (400). The return air chamber (600) is connected to the return air inlet (421), and the return air inlet (421) is used to discharge the turbulent flow formed by the convergence of airflow between the air outlet channels to the return air chamber (600).

12. The coating oven based on controllable hot air extraction according to claim 11, characterized in that, The upper air nozzle (400) is provided with a return air cavity (422) communicating with the return air chamber (600). The return air cavity (422) is provided with a return air inlet (421) and a return air outlet (430). The return air inlet (421) allows turbulent flow formed by the convergence of airflows to pass through and enter the return air cavity (422). The return air outlet (430) is used to discharge the gas in the return air cavity (422) to the return air chamber (600).

13. The coating oven based on controllable hot air extraction according to claim 11, characterized in that, It also includes a negative pressure suction device. The return air chamber (600) is provided with a second exhaust port (610). The negative pressure suction device is connected to the second exhaust port (610). The second exhaust port (610) is used to discharge the gas in the return air chamber (600).

14. A coating machine, characterized in that, Including the coating oven based on hot air extraction control as described in any one of claims 1 to 13.

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