Companies that make lithium batteries often need to use air compressors. The following from the key aspects of lithium battery manufacturing, analysis of the specific role of air compressor:
core Process and Gas Demand of 1. Lithium Battery Manufacturing
- electrode preparation
- pole piece coating: Purge the surface of the substrate with compressed air to ensure uniform coating and avoid interference of impurities.
- Pole piece drying the temperature of the drying oven is controlled by the pneumatic valve, and the compressed air is required to be dry and oil-free to prevent the pole piece from being damp or polluted.
- Cell assembly
- laminates/Winding: Use a pneumatic clamp to fix the pole piece and the diaphragm. Compressed air is required to provide a stable clamping force to ensure the alignment accuracy of the battery core.
- package welding: During the laser welding process, compressed air is used to cool the welding gun to prevent overheating and reduce the welding quality.
- Liquid injection and chemical formation
- electrolyte injection: Through the pneumatic pump precise control of the injection volume, the compressed air is required to be clean, to avoid electrolyte pollution.
- Formation test pneumatic test equipment needs to be driven by compressed air to simulate the battery charge and discharge cycle and test the battery performance.
- post-processing and detection
- laser cleaning: Purge the residue on the battery surface with compressed air to ensure a clean appearance.
- Air tightness detection: Check the tightness of the battery case by pressurizing with compressed air to prevent the risk of liquid leakage.
Selection Requirements of 2. Air Compressor
- air Quality Standards
- oil content: It should be ≤ 0.01 mg/m3 (ISO 8573-1 Class 1 standard) to avoid oil contamination of electrolyte or pole piece.
- Dust content: ≤ 1 micron (ISO 8573-1 Class 2) is required to prevent particulate matter from scratching the diaphragm or causing a short circuit.
- Pressure dew point: It should be ≤-40 ℃(ISO 8573-1 Class 4 standard) to ensure a dry environment and avoid battery flatulence caused by moisture.
- Equipment performance requirements
- stability continuous gas supply is required, and the pressure fluctuation is ≤ ± 0.1MPa to ensure the production rhythm.
- Energy efficiency: Prioritize the first-level energy-efficient model to reduce long-term operating costs.
- Silent noise needs to be ≤ 75 decibels to improve the working environment of the workshop.
3. typical application scenarios
- dust-free workshop
- environmental requirements: thousand/ten thousand cleanliness, compressed air needs to be treated by precision filter (0.01 micron filter element).
- Device Configuration: Oil-free air compressor, freeze dryer, multi-stage filter to ensure air cleanliness.
- automated production line
- pneumatic components: solenoid valve, cylinder, etc. need compressed air drive, response time ≤ 50 milliseconds.
- Energy saving demand: Using variable frequency air compressor, the air supply is automatically adjusted according to the load of the production line, and the energy saving rate can reach 30%.
4. Industry Case and Data Support
- ningde era: Its lithium battery production line adopts oil-free air compressor, the air supply pressure is 0.6-0.8MPa, the annual power consumption is about 1.2 million degrees, and the energy saving is 25% through frequency conversion transformation.
- BYD: In the liquid injection process, the accuracy of the pneumatic pump reaches 0.1 ml, which depends on the stable gas supply pressure (0.5MPa ± 0.02MPa) to ensure the consistent injection amount of electrolyte.
- Guoxuan Gaoke: In the test link, the compressed air-driven test equipment can detect 128 battery cells at the same time, and the efficiency is 40% higher than that of hydraulic drive.
Conclusion air compressor is the key equipment for lithium battery manufacturing, and its selection needs to strictly match the requirements of the process for air quality, pressure stability and energy efficiency. Through the reasonable configuration of oil-free models, precision post-processing equipment and intelligent control system, the high quality and high efficiency of battery production can be guaranteed.
