The packaging material used for flexible packaging lithium batteries is aluminum-plastic composite film, referred to as aluminum-plastic film. What is aluminum-plastic film? Aluminum composite film consists of five layers: outer nylon layer, adhesive, middle aluminum foil, adhesive and inner heat sealing layer.
The main function of the middle aluminum layer material is to prevent moisture from penetrating into the air. When moisture penetrates into the battery cell, it will react with the electrolyte to generate HF and form a side reaction to generate a large amount of gas, resulting in lithium battery bulging, which is one of the important hidden dangers of lithium batteries. Aluminum layer has a certain degree of strength, which can prevent damage to the battery from external forces.
The advantages of flexible pack batteries in terms of energy density, cycle life and safety have led to a penetration rate of nearly 70% in the consumer electronics field, while the market share in the power battery field is less than 13%. In the automobile-oriented market, more power battery companies will join the production of pouch batteries in the future.
8021 aluminum foil is used for the aluminum layer of lithium battery flexible packaging aluminum composite film. 8021 aluminum composite film aluminum foil for flexible battery is mainly 8021 aluminum alloy coil. 8021 aluminum foil produced by GNEE has a clean, smooth and oil-free surface. It has good adhesion and lamination properties, and is not easy to peel off or delaminate; at the same time, the product has excellent stamping and puncture resistance. The elongation of Huawei's 8021 aluminum foil has been tested to be 13%-18%, with a cupping of up to 7.3 mm, making it one of the few domestic aluminum foil substrate manufacturers that can fully meet the processing requirements for lithium battery aluminum-plastic films.