Novel air floatation oven device
By using the airflow suspension transmission technology of the air flotation drying oven, the problem of uneven drying on both sides of the electrode sheet is solved, achieving efficient and uniform double-sided coating drying, which is suitable for high-quality, large-scale continuous production of high-end coating processes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-04-10
AI Technical Summary
In existing double-sided coating processes, the drying effects on both sides of the electrode are inconsistent, leading to performance differences. The equipment occupies a large space, consumes a lot of heat energy, and has low production efficiency. Furthermore, the physical and chemical properties of the electrode are inconsistent, affecting the stability of battery performance.
An air-floating drying oven is used, which forms a stable constant-pressure airflow through the upper and lower air nozzle components and the static pressure chamber space to achieve suspension drying of the electrode sheets, avoiding contact conduction. The non-contact drying technology, combined with airflow suspension to transport the substrate, enables simultaneous drying of both sides.
It achieves uniform heating on both sides of the electrode, reduces defect rate, improves production efficiency, ensures the integrity of the double-sided coating structure, adapts to high-tensile or flexible materials, reduces pollution, and is suitable for high-quality, large-scale continuous production of high-end coating processes.
Smart Images
Figure CN121820138A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of air floating oven design of double-sided coating machine, and particularly relates to a novel air floating oven device. BACKGROUND
[0002] In battery production and manufacturing, drying of battery pole piece base material after coating slurry is one of important processes of battery production. Most of existing wet coating pole pieces adopt oven with supporting roller for drying. After single-sided coating of pole piece, the pole piece enters the oven for drying, and then the second side of the pole piece is coated with slurry, and then the second side of the pole piece enters the oven for drying of the second side of the wet slurry, and the first side is also heated and dried for the second time. Therefore, the drying effects of the two sides of the pole piece are inconsistent, thereby causing differences in performance of the two sides of the pole piece. The pole piece is coated and dried twice, which not only occupies more space, but also consumes more heat energy. Coating of only one side of the material causes inconsistency in physical properties (such as thickness, roughness, glossiness) and chemical properties (such as adhesion, water resistance, and conductivity) of both sides of the material. For example, in lithium battery electrode coating, single-sided coating may cause different adhesion of coatings on both sides of the pole piece, thereby affecting stability of battery performance. Drying of the double-sided coating in the folding type needs to be completed twice (first coating one side, drying, and then coating the other side), which causes extension of the production process, increase of equipment occupation time, and obvious efficiency bottleneck in large batch production. Therefore, further improvement is needed. SUMMARY
[0003] The present application provides a novel air floating oven device with high drying efficiency, uniform heating, and contribution to protection of pole piece base material and reduction of defective rate.
[0004] The present application employs the technical scheme for solving the above problems: The present application provides a novel air floating oven device, which comprises an air floating oven main body, wherein the air floating oven main body is internally provided with a tuyere assembly, The tuyere assembly comprises an upper tuyere assembly arranged above the lithium battery pole piece base material and a lower tuyere assembly arranged below the lithium battery pole piece base material, The upper tuyere assembly and the lower tuyere assembly are respectively arranged on both sides of the lithium battery pole piece base material, The air floating oven main body is further internally provided with a first static pressure cavity space and a second static pressure cavity space, The first static pressure cavity space is connected with the upper tuyere assembly, The second static pressure cavity space is connected with the lower tuyere assembly, The first static pressure cavity space and the second static pressure cavity space are respectively provided with a first air inlet pipe and a second air inlet pipe.
[0005] Furthermore, the top of the air flotation oven body is provided with an explosion-proof vent to ensure the safety of the air flotation oven body.
[0006] Furthermore, the main body of the air flotation oven is also equipped with a first return air chamber and a second return air chamber. The cavity walls of the first and second return air cavities are made of perforated plates.
[0007] Furthermore, the first and second return air chambers are connected to a return air duct and an exhaust fan. The exhaust fan is connected to the exhaust duct.
[0008] Furthermore, the first and second air inlet pipes are connected to a heating pack and a circulating fan.
[0009] Furthermore, the nozzle assembly includes a nozzle housing, the top of which is provided with a first mesh plate. The outer casing also has a second perforated plate inside, and a third perforated plate is provided between the first and second perforated plates. The first and third perforated plates form a first static pressure chamber. The space below the second perforated plate forms a second static pressure chamber 22.
[0010] Furthermore, the bottom of the nozzle housing is provided with a folded edge structure.
[0011] Furthermore, the nozzle housing also includes a fixing component inside, and the fixing component has a guide plate. The air guide plate and the folded edge structure form a nozzle slit structure 172.
[0012] Furthermore, the guide vane includes a first bend, a second bend, and a third bend. The third bend and the folded edge structure of the nozzle outer shell form the nozzle slit structure 172.
[0013] Furthermore, a nozzle height adjustment rod is provided on the outer side of the nozzle housing for adjusting the height of the nozzle assembly.
[0014] The beneficial effects of this invention are as follows: The novel air-floating drying oven device provided by this invention has advantages such as high drying efficiency, uniform heating, and help protect the electrode substrate and reduce the defect rate. This application uses airflow to suspend and transport the substrate instead of traditional roller conduction, and its advantages include: (1) Non-contact drying: avoids scratches, adhesion or deformation caused by contact between undried coating and roller, especially suitable for moisture-sensitive materials.
[0015] (2) Uniform heating: The airflow wraps around the substrate in all directions, resulting in a more uniform temperature distribution and reducing uneven drying or skin formation.
[0016] (3) Suitable for high-tensile materials: Suitable for extremely thin or flexible substrates (such as copper foil, diaphragm) to avoid tensile deformation caused by mechanical transmission.
[0017] (4) Reduced contamination: No roller friction reduces the risk of particulate contamination and improves cleanliness (such as in the production of lithium batteries that are sensitive to impurities).
[0018] (5) High-efficiency drying: After double-sided coating, the suspension oven can dry both sides quickly at the same time, shortening the process time.
[0019] (6) High-quality finished products: non-contact transfer + uniform drying ensures the integrity of the double-sided coating structure and avoids defects (such as cracks and bubbles).
[0020] (7) Process flexibility: The airflow speed and temperature can be adjusted to adapt to different coating thicknesses or solvent types.
[0021] (8) Reduce defect rate: Reduce waste caused by mechanical contact and uneven drying, which is especially important for high value-added products (such as power battery electrodes).
[0022] In summary, air-float drying ovens provide the conditions for double-sided coating. The combination of double-sided coating and air-float drying ovens represents a development trend in high-end coating processes, especially suitable for fields with stringent requirements for precision, efficiency, and yield. Its core value lies in achieving high-quality, large-scale continuous production through non-contact drying and symmetrical coating processes. Attached Figure Description
[0023] Figure 1 This is a structural diagram of a novel air flotation drying oven device according to the present invention; Figure 2 This is another structural diagram of a novel air flotation drying oven device according to the present invention; Figure 3 This is the third structural diagram of a novel air flotation drying oven device of the present invention; Figure 4 This is a structural diagram of the nozzle assembly of a novel air flotation drying oven device according to the present invention; Figure 5 This is a schematic diagram of the working state of the nozzle assembly of a novel air flotation oven device according to the present invention. Detailed Implementation
[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of protection of the present invention.
[0025] like Figures 1-3As shown, the present invention provides a novel air flotation drying oven device, including an air flotation drying oven body 1, wherein an air nozzle assembly 2 is provided inside the air flotation drying oven body 1. The nozzle assembly 2 includes an upper nozzle assembly 201 disposed above the lithium battery electrode substrate 3 and a lower nozzle assembly 202 disposed below the lithium battery electrode substrate 3. The upper air nozzle assembly 201 and the lower air nozzle assembly 202 are respectively disposed on both sides of the lithium battery electrode substrate 3. The air flotation oven body 1 is also provided with a first static pressure chamber space 4 and a second static pressure chamber space 5. The first static pressure chamber space 4 is connected to the upper air nozzle assembly 201. The second static pressure chamber space 5 is connected to the lower air nozzle assembly 202. The first static pressure chamber space 4 and the second static pressure chamber space 5 are respectively provided with a first air inlet pipe 6 and a second air inlet pipe 7.
[0026] In this embodiment, the top of the air flotation oven body 1 is provided with an explosion-proof vent 8 to ensure the safety of the air flotation oven body 1.
[0027] In this embodiment, the main body 1 of the air flotation oven is further provided with a first return air cavity 9 and a second return air cavity 10. The cavity walls of the first return air cavity 9 and the second return air cavity 10 are made of perforated plate 11.
[0028] In this embodiment, the first return air cavity 9 and the second return air cavity 10 are connected to a return air duct 12 and an exhaust fan 13. The exhaust fan 13 is connected to the exhaust duct 14.
[0029] In this embodiment, the first air inlet pipe 6 and the second air inlet pipe 7 are connected to a heating pack 15 and a circulating fan 16.
[0030] like Figures 4-5 As shown, in this embodiment, the nozzle assembly 2 includes a nozzle housing 17, and the top of the housing 17 is provided with a first mesh plate 18. The outer casing also includes a second perforated plate 19, and a third perforated plate 20 is disposed between the first perforated plate 18 and the second perforated plate 19. The first perforated plate 18 and the third perforated plate 20 form a first static pressure chamber 21. The space below the second perforated plate 19 forms a second static pressure chamber 22.
[0031] In this embodiment, the bottom of the nozzle housing 17 is provided with a folded edge structure 171.
[0032] In this embodiment, a fixing member 23 is further provided inside the nozzle housing 17, and a guide plate 231 is provided on the fixing member. The air guide plate 231 and the folded edge structure 171 form a nozzle slit structure 172.
[0033] In this embodiment, the guide plate 231 includes a first bending portion 2311, a second bending portion 2322, and a third bending portion 2323. The third bending portion 2323 and the folded edge structure of the nozzle housing 17 form the nozzle slit structure 172.
[0034] In this embodiment, a nozzle height adjustment rod 173 is provided on the outer side of the nozzle housing 17 for adjusting the height of the nozzle assembly 2. The specific work process for this application is as follows: like Figure 1 The main structure of the air flotation oven is divided into a box body, which contains a first static pressure chamber space 4 and a second static pressure chamber space 5, a nozzle assembly 2, a first return air chamber 9 and a second return air chamber 10. After the hot air is uniformly pressurized from the first static pressure chamber space 4 and the second static pressure chamber space 5, it forms a stable constant pressure airflow that enters the first static pressure chamber 21 formed by the first mesh plate 18 and the second mesh plate 19 of the upper nozzle assembly 201 and the lower nozzle assembly 202. This again forms a stable constant pressure airflow within the nozzle. When the airflow passes through the second mesh plate 19 and enters the static pressure chamber 2 between the second mesh plate 19 and the nozzle slit structure 172, it again forms a stable and uniform airflow. After multiple stages of uniform pressurization, the airflow from each nozzle slit structure 172 is kept at a stable constant pressure. Then, the airflow blown out by the nozzle slit structure 172 forms a partially enclosed area with the electrode, forming an air cushion area 100. Similar to the principle of a hovercraft, this allows the lithium battery electrode substrate 3 to glide across the air cushion surface formed on the nozzle surface, thereby achieving a suspended state of the lithium battery electrode substrate 3 and realizing an air-floating running belt.
[0035] After the airflow carries away the moisture from the lithium battery electrode substrate 3, it enters the return air inlet. In order to stabilize the airflow inside the oven, the airflow must pass through the perforated plate area of the return air cavity before entering the return air inlet. The perforated plate 11 can form a certain resistance to the airflow inside the oven, thereby stabilizing the air pressure inside the oven and preventing the airflow from affecting the stability of the electrode.
[0036] When the humid airflow reaches the return air duct 12, it converges and then splits into two branches. A small portion of the humid gas enters the exhaust pipe for NMP solvent recovery or removal of harmful substances before being discharged. The other branch, with most of the airflow entering the circulating fan, pressurizes the gas and blows it onto the heating pack for heating before it re-enters the oven.
[0037] The novel air-floating drying oven device provided by this invention has advantages such as high drying efficiency, uniform heating, and help protect the electrode substrate and reduce the defect rate. This application uses airflow to suspend and transport the substrate instead of traditional roller conduction, and its advantages include: (1) Non-contact drying: avoids scratches, adhesion or deformation caused by contact between undried coating and roller, especially suitable for moisture-sensitive materials.
[0038] (2) Uniform heating: The airflow wraps around the substrate in all directions, resulting in a more uniform temperature distribution and reducing uneven drying or skin formation.
[0039] (3) Suitable for high-tensile materials: Suitable for extremely thin or flexible substrates (such as copper foil, diaphragm) to avoid tensile deformation caused by mechanical transmission.
[0040] (4) Reduced contamination: No roller friction reduces the risk of particulate contamination and improves cleanliness (such as in the production of lithium batteries that are sensitive to impurities).
[0041] (5) High-efficiency drying: After double-sided coating, the suspension oven can dry both sides quickly at the same time, shortening the process time.
[0042] (6) High-quality finished products: non-contact transfer + uniform drying ensures the integrity of the double-sided coating structure and avoids defects (such as cracks and bubbles).
[0043] (7) Process flexibility: The airflow speed and temperature can be adjusted to adapt to different coating thicknesses or solvent types.
[0044] (8) Reduce defect rate: Reduce waste caused by mechanical contact and uneven drying, which is especially important for high value-added products (such as power battery electrodes).
[0045] In summary, air-float drying ovens provide the conditions for double-sided coating. The combination of double-sided coating and air-float drying ovens represents a development trend in high-end coating processes, especially suitable for fields with stringent requirements for precision, efficiency, and yield. Its core value lies in achieving high-quality, large-scale continuous production through non-contact drying and symmetrical coating processes.
[0046] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A novel air-floating drying oven device, characterized in that: It includes an air flotation oven body, and the air flotation oven body is equipped with an air nozzle assembly. The nozzle assembly includes an upper nozzle assembly disposed above the lithium battery electrode substrate and a lower nozzle assembly disposed below the lithium battery electrode substrate. The upper and lower air nozzle assemblies are respectively located on both sides of the lithium battery electrode substrate. The air flotation oven body also includes a first static pressure chamber space and a second static pressure chamber space. The first static pressure chamber space is connected to the upper air nozzle assembly. The second static pressure chamber is connected to the lower air nozzle assembly. The first static pressure chamber space and the second static pressure chamber space are respectively provided with a first air inlet pipe and a second air inlet pipe.
2. The novel air flotation drying oven device according to claim 1, characterized in that: The top of the air flotation oven body is equipped with an explosion-proof vent to ensure the safety of the air flotation oven body.
3. The novel air flotation drying oven device according to claim 1, characterized in that: The air flotation oven body is also equipped with a first return air chamber and a second return air chamber. The cavity walls of the first and second return air cavities are made of perforated plates.
4. The novel air flotation drying oven device according to claim 1, characterized in that: The first and second return air chambers are connected to a return air duct and an exhaust fan. The exhaust fan is connected to the exhaust duct.
5. The novel air flotation drying oven device according to claim 1, characterized in that: The first and second air inlet pipes are connected to a heating pack and a circulating fan.
6. The novel air flotation drying oven device according to claim 1, characterized in that: The nozzle assembly includes a nozzle housing, and a first mesh plate is provided on the top of the housing. The outer casing also has a second perforated plate inside, and a third perforated plate is provided between the first and second perforated plates. The first and third perforated plates form a first static pressure chamber. The space below the second perforated plate forms a second static pressure chamber.
7. The novel air flotation drying oven device according to claim 6, characterized in that: The bottom of the nozzle housing has a folded edge structure.
8. A novel air-floating drying oven device according to claim 6 or 7, characterized in that: The nozzle housing also has a fixing component inside, and the fixing component is equipped with a guide plate. The air guide plate and the folded edge structure form a nozzle slit structure 172.
9. A novel air-floating drying oven device according to claim 7 or 8, characterized in that: The guide vane includes a first bend, a second bend, and a third bend. The third bend and the folded edge structure of the nozzle outer shell form the nozzle slit structure 172.
10. A novel air-floating drying oven device according to claim 6, characterized in that: The outer side of the nozzle housing is provided with a nozzle height adjustment rod for adjusting the height of the nozzle assembly.