Lithium battery slurry coating equipment based on electrothermal field composite module and air knife module
By combining the electrothermal field composite module and the air knife module, the problems of deposition and uneven thickness in the lithium battery slurry coating process are solved, achieving uniform dispersion of the slurry on the substrate surface and stability of the coating layer, thereby improving the battery performance and safety of lithium batteries.
Patent Information
- Application Number
- CN202423144675.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing lithium battery slurry coating processes suffer from problems such as slurry deposition, agglomeration, and inconsistent coating thickness, especially in slurries with high viscosity or large particles, which affect the effective area of electrode materials and battery performance.
The design combines an electrothermal field composite module with an air knife module. Through the combined effect of multiple electric and thermal fields, the slurry is promoted to be evenly dispersed on the substrate. The airflow regulation of the air knife module controls the coating thickness, ensuring the uniformity and stability of the coating.
It effectively prevents slurry particle deposition and agglomeration, improves the uniformity and stability of the coating layer, reduces coating defects, and enhances battery performance and safety.
Smart Images
Figure CN223655390U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of lithium battery coating technology, specifically, relates to the lithium battery slurry coating equipment based on electrothermal field composite module and air knife module. BACKGROUND
[0002] The existing lithium battery slurry coating process often adopts scraper, extrusion coating and other ways, which can ensure the uniformity of coating to some extent, but still faces some significant problems. First, deposition and agglomeration of slurry easily occur in the coating process, especially in high viscosity or large particle slurry, causing the instability of coating thickness. This not only affects the effective area of electrode material and reduces the energy density of the battery, but also may cause uneven current distribution in the battery, affecting the performance of the battery. In addition, deposition and agglomeration may cause local electrode coating to be too thin, resulting in uneven battery capacity or overheating. It may also cause local over-thickness, increase internal resistance and reduce cycle efficiency, and even may cause safety problems. Second, the longitudinal uniform distribution of slurry depends on passive flow control, lacks deep regulation of slurry distribution, and it is difficult to avoid deposition.
[0003] Therefore, the present application is proposed. UTILITY MODEL CONTENT
[0004] The technical problem to be solved by the utility model is that the existing coating method has problems such as slurry deposition, agglomeration and inconsistent coating thickness, and the purpose is to provide a lithium battery slurry coating equipment based on electrothermal field composite module and air knife module. By introducing an electric field module and an air knife module in the coating process, and integrating the electric field module and the hot oven, the slurry can be subjected to multi-field complex action of electric field and thermal field at the same time of slurry coating, promoting the uniform dispersion of slurry on the substrate, preventing the deposition or agglomeration of particles in high viscosity slurry, and maintaining the consistency of coating layer thickness through the air knife.
[0005] The utility model realizes the following technical scheme:
[0006] A lithium battery slurry coating equipment based on electrothermal field composite module and air knife module, comprising a first substrate transmission roller group and a second substrate transmission roller group, an electrothermal field composite module is arranged between the first substrate transmission roller group and the second substrate transmission roller group;
[0007] A slurry coating device is arranged above the first substrate transmission roller group, and the first substrate transmission roller group sequentially transmits the substrate to the slurry coating device, the electrothermal field composite module and the second substrate transmission roller group;
[0008] The slurry coating device is used for coating slurry on the surface of the moving transmission substrate;
[0009] The electrothermal field composite module is used for applying an electric field and heating to a substrate coated with slurry.
[0010] The slurry coating equipment of the utility model, introduce electrothermal field composite module in coating process, make in the slurry coating, slurry can receive the multi-field complex effect of electric field and thermal field simultaneously. First, the conductive agent, binder and other particles and molecules in the coating slurry will polarize in the electric field, and will be arranged in a direction under the action of the electric field, and the electric field can help the particles form a suitable spacing, reduce the aggregation between the particles, and further promote the uniform dispersion of the slurry, reducing the surface defects caused by uneven particles in traditional coating. The thermal field can improve the Brownian motion of the particles in the slurry, help the particles maintain uniform dispersion, and prevent the deposition or agglomeration of particles in high-viscosity slurry; meanwhile, heating can enhance the interaction between molecules and particles in the slurry, so that they maintain stable distribution and avoid uneven coating and unstable coating thickness caused by deposition. In addition, the increase in temperature helps to improve the movement between molecules in the slurry, reduce the attraction between molecules, avoid excessive aggregation, and promote uniform coating. The slurry can be more evenly distributed on the surface of the substrate through the synergistic effect of the electric field and the thermal field, further improving the surface quality of the coating.
[0011] In a specific embodiment, the electrothermal field composite module comprises an oven, and an electric field auxiliary module is arranged in the oven, wherein the electric field auxiliary module comprises electrode plates arranged in parallel on the upper and lower sides of the substrate respectively, and is used for forming an electric field perpendicular to the substrate.
[0012] The electric field auxiliary module of the utility model mainly applies an electric field perpendicular to the surface of the coating slurry to promote the uniform distribution of charged particles or molecules in the slurry on the coating surface, thereby improving the uniformity of the coating slurry.
[0013] The electrode plates are made of metal materials (such as aluminum alloy or stainless steel) and have good electrical conductivity. The number and arrangement of the electrode plates can be customized according to the width and thickness of the coating; preferably, the width of the electrode plate is 50-1000mm, and the thickness of the electrode plate is 3-5mm.
[0014] In a specific embodiment, the electric field auxiliary module further comprises an electric field generator, i.e. a power supply, for providing the voltage required by the electric field. The output voltage of the electric field generator can be adjusted to meet the needs of different coating materials. The output voltage ranges from 0 to 10kV (DC high voltage), the electric field strength is 100-500V / cm, and the output current is 5-20mA. The specific parameters depend on the electrical conductivity of the slurry itself and the coating speed.
[0015] In a specific embodiment, the electrode plates are installed on the inner wall of the oven through a connecting structure, and the electrode plates have a gap between the inner walls of the oven.
[0016] This invention relates to an electrothermal field composite module, integrating the electric field auxiliary module with the oven design. Specifically, an electrode plate is mechanically connected to the inner wall of the oven, maintaining a certain gap between the electrode plate and the inner wall. An electromagnetic isolation device prevents the electric field from interfering with the oven's temperature control system. The electric field generator is connected to the electrodes via a high-voltage cable. The oven's heating element uses a traditional hot air circulation system for temperature regulation, while the electric field auxiliary module conducts voltage through the electrode plate, providing a uniform electric field for the coating slurry. This integrated design not only ensures that the electric and thermal fields work together on the coating slurry but also effectively reduces the equipment's footprint and improves production efficiency.
[0017] In one specific embodiment, an air knife module is provided above the last roller of the second substrate transfer roller group. The substrate transmission direction at the last roller is vertically downward, and the air knife module is used to generate a vertically downward air knife airflow to the substrate surface.
[0018] This invention, by incorporating an air knife module, can apply wind force to the coating layer by spraying directional airflow during the coating and winding process. The airflow smooths the surface of the coating slurry, removes areas of excessive coating thickness, and makes the coating thickness more uniform.
[0019] In addition, the airflow regulation of the air knife module not only helps control the coating thickness but also smooths the coating surface and removes excess slurry during the coating process. This directional airflow significantly reduces surface defects in the coating layer, such as bubbles, cracks, or particle buildup, improving the smoothness and quality of the coating surface.
[0020] In one specific embodiment, the air knife module includes an air knife body, an air flow control module, and a thickness sensor.
[0021] In one specific embodiment, the air knife body includes an elongated air tube with multiple airflow nozzles arranged along its length. The number and spacing of the nozzles are optimized according to the size and requirements of the coating machine. The length of the air knife is typically matched to the coating width, usually 50-1000 mm; the nozzle orifice diameter is 0.5-1 mm, and the orifice spacing is 10-15 mm.
[0022] In one specific embodiment, the airflow control module includes an air compressor, an air pipe, and an airflow regulating valve. The airflow regulating valve is used to adjust the airflow pressure and speed to ensure that the air knife can effectively smooth the coating layer during the coating process. The air pressure is 0.2-0.5 MPa; the airflow rate is 50-100 m³ / h. 3 / h; Wind speed: 10-30m / s.
[0023] In a specific embodiment, the thickness sensor is used to measure the thickness of the slurry coating on the surface of the substrate, and the air knife dynamically adjusts the air flow according to the real-time feedback of the coating layer thickness data, thereby optimizing the thickness control of the coating layer, reducing the uneven thickness phenomenon in the coating process, and ensuring the consistency of the final coating thickness.
[0024] The thickness sensor is a non-contact thickness sensor, wherein the measurement range is 10-500 μm, the measurement accuracy is ±1 μm, and the resolution is 0.1 μm.
[0025] In a specific embodiment, an integrated control system is also provided for synchronous control of the electric field composite module and the air knife module to ensure the coordination of the two in the coating process. The control system can adjust the voltage and current of the electric field module, the air flow and wind speed of the air knife module, and real-time monitor various parameters in the coating process, to ensure the stability of the coating process.
[0026] The electric field auxiliary module can promote particle distribution in high-viscosity slurry and improve the flowability of the slurry on the coated substrate by applying an electric field, thereby effectively overcoming the problem of uneven coating of high-viscosity slurry. The synergistic effect of the electric field and the air knife module ensures that even in the coating process of high-solid-content slurry, the coating layer can maintain high uniformity and stability, reducing problems such as slurry deposition and uneven rheology.
[0027] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0028] 1. The lithium battery slurry coating equipment based on the electric field composite module and the air knife module provided by the embodiment of the utility model can control the arrangement of the slurry on the surface of the substrate by increasing the electric field in the coating process, avoid the problem of uneven coating and large thickness variation in the traditional coating process, and effectively promote the uniform distribution of charged particles or molecules in the slurry on the surface of the coated substrate through the multi-field complex effect of the electric field and the thermal field, thereby significantly improving the uniformity of the coating layer.
[0029] 2. The lithium battery slurry coating equipment based on the electric field composite module and the air knife module provided by the embodiment of the utility model can remove excess slurry, surface large particles and impurities in the coating process through the directional air flow effect of the air knife module, control the thickness of the coating layer, smooth the coating surface, avoid defects in the coating process, and further improve the coating quality.
[0030] 3. The lithium battery slurry coating equipment based on the electric field composite module and the air knife module provided by the embodiment of the utility model can promote particle distribution in high-viscosity slurry and improve the flowability of the slurry on the coated substrate by applying an electric field through the electric field auxiliary module, thereby effectively overcoming the problem of uneven coating of high-viscosity slurry.
[0031] 4. The lithium battery slurry coating equipment based on the electrothermal field composite module and the air knife module, the synergistic effect of the electric field and the air knife module ensures that the high uniformity and stability of the coating layer can be maintained even in the coating process of high solid content slurry, and problems such as slurry deposition and rheological unevenness are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0032] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0033] Figure 1 The lithium battery slurry coating equipment is provided for the embodiments of the present application;
[0034] Figure 2 The electric field distribution schematic diagram is provided for the embodiments of the present application.
[0035] Markings in the drawings and corresponding names of parts:
[0036] 1 - first base material transmission roller group, 2 - second base material transmission roller group, 3 - electrothermal field composite module, 4 - slurry coating device, 5 - oven, 6 - electric field auxiliary module, 7 - electrode plate, 8 - air knife module, 9 - air knife main body. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical scheme and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with embodiments and drawings, and the exemplary embodiments of the present application and the description thereof are only used to explain the present application, and not as a limitation on the present application.
[0038] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application does not have to be implemented with these specific details. In other embodiments, in order to avoid obscuring the present application, well-known structures are not specifically described.
[0039] Reference throughout this specification to "one embodiment", "an embodiment", "one example", or "an example", means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. Thus, appearances of the phrases "in one embodiment", "in an embodiment", "in one example", or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable
[0040] In the description of the application, the terms "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the application.
[0041] Embodiments
[0042] As shown in Figure 1 and Figure 2 The lithium battery slurry coating equipment based on the electrothermal field composite module and the air knife module provided by the embodiments of the application comprises a first base material transmission roller group 1 and a second base material transmission roller group 2, and an electrothermal field composite module 3 is arranged between the first base material transmission roller group 1 and the second base material transmission roller group 2.
[0043] A slurry coating device 4 is arranged above the first base material transmission roller group 1, and the first base material transmission roller group 1 sequentially transmits the base material to the slurry coating device 4, the electrothermal field composite module 3 and the second base material transmission roller group 2; and the second base material transmission roller group 2 is used for winding the base material after the slurry is coated.
[0044] The slurry coating device 4 is used for coating the slurry on the surface of the moving transmission base material.
[0045] The electrothermal field composite module 3 is used for applying an electric field and heating to the base material coated with the slurry.
[0046] The slurry coating equipment introduces an electric heating field composite module in the coating process, so that the slurry can be subjected to multi-field composite action of electric field and thermal field at the same time during slurry coating. First, the conductive agent, binder and other particles and molecules in the coating slurry will polarize in the electric field, and will be arranged in a direction under the action of the electric field, and the electric field can help the particles to form a suitable spacing between the particles, reduce the aggregation between the particles, and further promote the uniform dispersion of the slurry, and reduce the surface defects caused by uneven particles in the traditional coating. The thermal field can improve the Brownian motion of the particles in the slurry, help the particles to maintain uniform dispersion, and prevent the deposition or agglomeration of the particles in the high-viscosity slurry; meanwhile, heating can enhance the interaction between the molecules and the particles in the slurry, so that they can maintain stable distribution and avoid uneven coating and unstable coating thickness caused by deposition. In addition, the temperature rise helps to improve the movement between the molecules in the slurry, reduces the attraction between the molecules, avoids excessive aggregation, and promotes uniform coating. Through the synergistic effect of the electric field and the thermal field, the slurry can be more uniformly distributed on the surface of the substrate, and the coating surface quality is further improved.
[0047] In a specific embodiment, the electric heating field composite module comprises an oven 5, and an electric field auxiliary module 6 is arranged in the oven 5, wherein the electric field auxiliary module 6 comprises electrode plates 7 arranged in parallel on the upper and lower sides of the substrate respectively, and is used for forming an electric field perpendicular to the substrate.
[0048] The electric field auxiliary module of the utility model mainly promotes the charged particles or molecules in the coating slurry to be uniformly distributed on the coating surface by applying an electric field perpendicular to the surface of the coating slurry, so as to improve the uniformity of the coating slurry.
[0049] The electrode plates are made of metal materials such as aluminum alloy or stainless steel, and have good conductivity. The number and arrangement mode of the electrode plates can be customized according to the width and thickness of the coating; preferably, the width of the electrode plate 7 is 50-1000mm, and the thickness of the electrode plate is 3-5mm.
[0050] In a specific embodiment, the electric field auxiliary module 6 further comprises an electric field generator, i.e. a power supply, for providing the voltage required by the electric field. The output voltage of the electric field generator can be adjusted to meet the needs of different coating materials. The output voltage range is 0-10kV direct current high voltage, the electric field strength is 100-500V / cm, and the output current is 5-20mA. The specific parameters depend on the conductivity of the slurry itself and the coating speed.
[0051] In a specific embodiment, the electrode plate 7 is installed on the inner wall of the oven 5 through a connecting structure, and the electrode plate 7 has a gap between the inner wall of the oven 5.
[0052] The electric field auxiliary module and the oven are integrally designed, specifically, the electrode plate and the inner wall of the hot oven are connected through a mechanical structure, the electrode plate and the inner wall of the hot oven are installed with a certain gap, and the electromagnetic isolation device is used to prevent the electric field from interfering with the oven temperature control system.The electric field generator is connected with the electrode through a high-voltage cable.The heating part of the oven provides temperature adjustment through a traditional hot air circulation system, and the electric field auxiliary module conducts voltage through the electrode plate to provide uniform electric field action on the coating slurry.This integrated design not only ensures that the electric field and the heat field act on the coating slurry together, but also effectively reduces the floor space occupied by the equipment and improves the production efficiency.
[0053] In a specific embodiment, an air knife module 8 is arranged above the last roller in the second substrate transport roller group 2, the substrate transmission direction of the last roller is vertically downward, and the air knife module 8 is used to generate a vertically downward air knife airflow to the surface of the substrate.
[0054] The air knife module can spray directional airflow during coating and winding to apply wind force on the coating layer, and the airflow can be used to smooth the surface of the coating slurry, remove the over-thick coating area, and make the coating thickness more uniform and consistent.
[0055] In addition, the airflow adjustment of the air knife module not only helps to control the thickness of the coating layer, but also smooths the coating surface and removes excess slurry during the coating process. The effect of the directional airflow can significantly reduce surface defects of the coating layer, such as bubbles, cracks or particle accumulation, and improve the smoothness and quality of the coating surface.
[0056] In a specific embodiment, the air knife module 8 includes an air knife body 9, an air flow control module and a thickness sensor.
[0057] In a specific embodiment, the air knife body includes an air pipe in the shape of a long strip, and a plurality of airflow nozzles are arranged on the air pipe along the length direction. The number and spacing of the nozzles are optimized according to the size and requirements of the coating machine. The length of the air knife is usually matched with the coating width, which is usually 50-1000mm; the air knife nozzle aperture is 0.5-1mm, and the hole spacing is 10-15mm.
[0058] In a specific embodiment, the air flow control module includes an air compressor, an air pipe and an airflow regulating valve, the airflow regulating valve is used to adjust the pressure and speed of the airflow to ensure that the air knife can effectively smooth the coating layer during the coating process. The air pressure is 0.2-0.5MPa; the air flow is 50-100m 3 / s; the wind speed is 10-30m / s.
[0059] In a specific embodiment, the thickness sensor is used to measure the thickness of the slurry coating on the surface of the substrate, and the air knife dynamically adjusts the air flow according to the real-time feedback of the coating thickness data, thereby optimizing the thickness control of the coating, reducing the uneven thickness phenomenon in the coating process, and ensuring the consistency of the final coating thickness.
[0060] The thickness sensor is a non-contact thickness sensor, wherein the measurement range is 10-500 μm, the measurement accuracy is ±1 μm, and the resolution is 0.1 μm.
[0061] In a specific embodiment, the air knife module further comprises a recovery tank arranged below the second substrate conveying roller group 2 for collecting slurry waste removed by the air knife.
[0062] In a specific embodiment, an integrated control system is further provided for synchronously controlling the electric field composite module and the air knife module to ensure the coordination of the two in the coating process. The control system can adjust the voltage and current of the electric field module, the air flow and wind speed of the air knife module, and real-time monitor various parameters in the coating process, to ensure the stability of the coating process.
[0063] The electric field auxiliary module can promote particle distribution in high-viscosity slurry and improve the flowability of the slurry on the coated substrate by applying an electric field, thereby effectively overcoming the problem of uneven coating of high-viscosity slurry. The synergistic effect of the electric field and the air knife module ensures that even in the coating process of high-solid-content slurry, the coating layer can maintain high uniformity and stability, and reduce problems such as slurry deposition and uneven rheology.
[0064] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A lithium battery slurry coating apparatus based on electrothermal field composite module and air knife module, characterized by, The application relates to a kind of electric field and heat field composite module and substrate transmission device, comprising first substrate transmission roller group (1) and second substrate transmission roller group (2), and electric field and heat field composite module (3) is arranged between first substrate transmission roller group (1) and second substrate transmission roller group (2); First substrate transmission roller group (1) is provided with slurry coating device (4) above, and first substrate transmission roller group (1) sequentially transmits substrate to slurry coating device (4), electric field and heat field composite module (3) and second substrate transmission roller group (2); Slurry coating device (4) is used to coat slurry on the surface of moving transmission substrate; Electric field and heat field composite module (3) is used to apply electric field and heat to the substrate coated with slurry. 2.The lithium battery slurry coating device based on the electrothermal field composite module and the air knife module of claim 1, wherein, The electric field and heat field composite module comprises oven (5), and electric field auxiliary module (6) is arranged in oven (5), and electric field auxiliary module (6) comprises electrode plate (7) arranged in parallel on the upper and lower sides of substrate respectively, for forming vertical electric field with substrate. 3.The lithium battery slurry coating device based on the electrothermal field composite module and the air knife module of claim 2, wherein, The width of electrode plate (7) is 50-1000mm, and the thickness of electrode plate is 3-5mm. 4.The lithium battery slurry coating device based on the electrothermal field composite module and the air knife module of claim 2, wherein, Electric field auxiliary module (6) further comprises electric field generator for providing the required voltage of electric field. 5.The lithium battery slurry coating device based on electrothermal field composite module and air-knife module of claim 2, wherein, Electrode plate (7) is installed on the inner wall of oven (5) by connecting structure, and electrode plate (7) has gap between oven (5) inner wall. 6.The electrothermal field composite module and air-knife module based lithium battery slurry coating apparatus according to claim 1, wherein, The most terminal roller in second substrate transmission roller group (2) is provided with air knife module (8) above, and the transmission direction of substrate is vertically downward at the most terminal roller, and air knife module (8) is used to generate vertical downward air knife airflow to the surface of substrate. 7.The lithium battery slurry coating apparatus based on the electrothermal field composite module and the air-knife module of claim 6, wherein, Air knife module (8) comprises air knife main body (9), air flow control module and thickness sensor. 8.The lithium battery slurry coating device based on the electrothermal field composite module and the air-knife module of claim 7, wherein, The air knife main body comprises air pipe in strip shape, and a plurality of airflow nozzles are arranged on the air pipe along the length direction. 9.The lithium battery slurry coating device based on the electrothermal field composite module and the air-knife module of claim 7, wherein, Air flow control module comprises air compressor, air pipe and airflow regulating valve. 10.The lithium battery slurry coating device based on the electrothermal field composite module and the air knife module of claim 7, wherein, The thickness sensor is non-contact thickness sensor, and is used to measure the thickness of slurry coating on the surface of substrate.