What are the advantages of aluminum-plastic film in soft pack lithium batteries?

1. Material Structure and Technical Principles

Aluminum plastic film adopts a three-layer or four layer composite structure (nylon layer/aluminum foil layer/heat sealing layer/PET layer), which is achieved through dry/hot composite process:

Outer layer nylon (12-25 μ m): resistant to puncture and electrolyte corrosion

Barrier layer aluminum foil (40-60 μ m) barrier layer

Inner CPP (30-50 μ m): a heat sealing material with a melting point of 135-140 ℃, ensuring the reliability of the ear seal

3. Five core competitive advantages

① Energy density increase

Compared to steel shell batteries, it reduces weight by 40% and enables the mass energy density of ternary system batteries to exceed 300Wh/kg

② Security performance innovation

When thermal runaway occurs, the aluminum layer melts to form a pressure relief channel (explosion pressure 1.5-3.5MPa)

Through rigorous testing such as needle puncture and overcharging according to GB31241-2022

③ Cost optimization path

The material cost is 15-20% lower than that of hard shell batteries

Reduce the thickness of individual batteries by 20%, improve the utilization of Pack space

④ Process compatibility

Supports both lamination and winding processes, with ear forming methods covering:

Stamping type (traditional process)

Laser etching type (new generation technology)

⑤ Environmental Value

Compliant with the EU ELV directive, the recyclability rate has increased by 60% compared to traditional packaging