Lithium battery factory compressed air standard

Analysis of compressed air standards in lithium battery factories

In the production process of lithium batteries, compressed air serves as a key power source and process gas, and its quality standards directly affect battery performance and safety. The following is an analysis of lithium battery factory compressed air standards based on industry specifications and practical applications:

1. Core standards for compressed air quality

1. cleanliness requirements
   • dust content: It needs to be controlled at ≤5 mg/m³ to prevent particles from contaminating electrode materials.
   • oil content: Requirements ≤10 mg/m³ (some high-precision processes need to meet ISO 8573-1 Class 1 standard, that is, oil content ≤0.01 mg/m³) to avoid potential safety hazards caused by the reaction between oil and electrolyte.
2. dryness control
   • pressure dew point: Generally required ≤-40℃ (some processes need to reach-70℃) to ensure that the moisture content in the compressed air is extremely low and prevent moisture from reacting with lithium salts to form corrosive hydrofluoric acid (HF).
3. other key indicators
   • pressure stability: It needs to meet the equipment and process requirements (such as precise pressure control is required in liquid injection and rolling processes).
   • gas purity: The purity of protective gases such as nitrogen must be ≥99.999% to avoid impurities affecting the performance of the battery.

2. Industry certification and regulatory basis

1. domestic standards
   • GB 50029 “Code for Design of Compressed Air Stations”: Clarify the design, energy efficiency level and safety requirements of the air compressor station.
   • GB 50472 “Code for Design of Clean Workshops in the Electronics Industry”: It is stipulated that the cleanliness of the lithium battery factory must reach more than 1000, and the compressed air must meet the dust-free requirements.
2. international standards
   • ISO 8573-1: For the international general compressed air quality grade standard, lithium battery factories need to refer to Class 1-4 grade selection and adaptation standards.
3. equipment qualification
   • Pressure pipeline qualification: Compressed air pipes must have GC1/GC2 level design and installation permits to ensure safe gas transportation.

3. Applications of compressed air treatment equipment

1. oil free compressor
   • technology selection: Priority is given to oil-free screw or scroll air compressor to avoid lubricating oil pollution.
   • companion device: Equipped with a multi-stage filtration system (oil mist filter, activated carbon absorber) and a freezing/adsorption dryer to ensure clean and dry compressed gas.
2. intelligent monitoring system
   • real-time detection: Deploy dew point meters, oil content detectors and other equipment to dynamically monitor compressed air quality.
   • early warning function: Timely warning of abnormalities such as pressure fluctuations and excessive water content to avoid production accidents.
3. energy saving and environmental protection
   • energy efficiency rating: Choose a level 1 energy-efficient air compressor to reduce energy consumption costs.
   • waste heat recovery: Use compression heat regenerative drying technology to reduce energy consumption.

4. Lithium battery process scenarios compressed air application

conclusion: The compressed air standard of lithium battery factories must take into account cleanliness, dryness and process adaptability. Through oil-free air compression systems, multi-stage purification equipment and intelligent monitoring, the quality of compressed air is ensured to meet GB/ISO specifications and production requirements, ensuring battery safety. and performance stability.