Thermal oil furnaces play a crucial role in the lithium-ion battery coating industry, particularly in key processes such as electrode material preparation, coating and drying, and separator production.
Main Application Areas
1. Vacuum Drying of Cathode Materials
Thermal oil furnaces provide a stable heat source for vacuum dryers through indirect jacket heating, ensuring uniform heating of the cathode material in a vacuum environment. Under vacuum conditions, the boiling point of water decreases, and the heat provided by the thermal oil furnace promotes rapid evaporation and timely removal of moisture, improving drying efficiency while preventing material oxidation and ensuring material quality.
2. Coating Solution Temperature Control
During the lithium-ion battery electrode coating process, thermal oil furnaces can precisely control the temperature of the coating solution, ensuring its viscosity and flowability are at their optimal levels. Temperature control reduces edge and surface effects during coating, improving coating uniformity and stability, thereby enhancing coating quality and efficiency.
3. Lateral Stretching and Drying/Shaping of the Separator
During the lateral stretching and drying/shaping process of the separator, the thermal oil furnace heats and controls the temperature of the mold and rollers, helping to eliminate internal stress in the film, reduce shrinkage, and improve the performance of the separator. Precise temperature control improves the mechanical strength and thermal stability of the separator, which is crucial for improving battery safety and cycle life.
Technical Advantages
High-Precision Temperature Control
The thermal oil furnace has extremely high temperature control accuracy, controlling temperature fluctuations within ±1℃, ensuring temperature stability during lithium battery production, thereby effectively improving the consistency and performance stability of lithium batteries.
High Efficiency and Energy Saving
The thermal oil furnace achieves a thermal efficiency of over 90%, saving 50% energy compared to traditional steam boilers. Utilizing a closed-loop circulation system, the thermal oil is always in a liquid phase, eliminating heat loss from condensation and significantly improving energy utilization efficiency.
Safe and Reliable Operation
The thermal oil furnace can achieve high-temperature operation under low pressure, with low system operating pressure and high safety. The equipment is equipped with multiple safety protection devices, including over-temperature protection, over-pressure protection, and oil shortage alarm, ensuring long-term stable operation. Selection Requirements
Temperature Range Requirements
Lithium battery production demands strict temperature control. The thermal oil furnace needs to provide high-temperature output above 400℃, with temperature control accuracy stable within ±1℃. This is especially crucial during the cathode material sintering process, requiring long-term stable temperature control within the 400℃-800℃ range.
Power Configuration
Based on production process requirements, the power selection for the thermal oil furnace needs to consider heat load calculations. It is generally recommended to reserve a 10%-20% power margin to accommodate changes in production processes and future capacity expansion needs.
Material Compatibility
The furnace body material needs to have good compatibility with the thermal oil. Stainless steel is typically used to avoid chemical reactions or corrosion. Simultaneously, the selection of the thermal oil needs to consider high-temperature stability and oxidation resistance.
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Post time: Dec-15-2025
