Lithium battery manufacturing, main applications of compressed air

In lithium battery manufacturing, compressed air isCore power sources and process mediaThroughout the 12 key processes from electrode preparation to battery packaging, the specific application can be divided into five major scenarios:

1. Electrode coating process

1. slurry delivery
   • The positive and negative slurry drives the diaphragm pump by compressed air to achieve high-precision quantitative transportation (error <0.5%)
2. Coating die control
   • The cylinder drives the die head trimming mechanism to adjust the coating width in real time (response speed <0.1 seconds)
3. pole piece drying
   • The hot air circulation oven uses compressed air to drive an air knife, which improves the drying efficiency of pole pieces by 30%

2. Liquid injection and vacuum packaging

1. electrolyte injection
   • The compressed air drives the ceramic pump to achieve accurate injection of μL electrolyte (injection accuracy ±1%)
2. cell sealing
   • The pneumatic press provides a constant pressure of 5-10 tons, ensuring a heat-sealing yield of aluminum-plastic film>99.8%
3. vacuum argon return
   • Before liquid injection, the vacuum pump is driven by compressed air to achieve less than 10ppm moisture in the battery cavity

3. Laser welding and cutting

1. protective air curtain
   • The compressed air forms a laminar air curtain to prevent welding spatters from polluting the battery cells (air curtain flow>20m³/h)
2. lug cutting
   • Pneumatic clamping jaws achieve precise positioning of the lug, and the cutting accuracy reaches ±0.05mm

4. Environmental control and testing

1. Clean room positive pressure maintenance
   • The compressed air is filtered by three stages (FFU system) to maintain Class 1000 cleanliness
2. X-ray inspection equipment
   • The pneumatic conveyor belt achieves non-destructive testing of the battery cells, and the inspection efficiency is>120pcs/min

5. Equipment maintenance and production assistance

1. Mold cleaning
   • Pulse blowing system removes residual slurry from coating molds (purging pressure>6bar)
2. Robot joint drive
   • The pneumatic servo system drives the handling robot with a beat time <3 seconds/time

special technical requirements

• oil content: Must meet ISO 8573-1 Class 1 standard (<0.01mg/m³)
• dew point: Critical processes require pressure dew point ≤-60℃ (prevent moisture from reacting with electrolyte)
• granularity: A precision filter of 0.01μm level needs to be equipped to avoid particles causing micro-short circuits in the battery

industry trends: With the mass production of the 4680 cylindrical battery, the compressed air system is positiveModular and intelligentUpgrade to realize the linkage between the air compressor station and the MES system through Internet of Things technology to dynamically match production capacity fluctuations.