Aluminum Laminated Film as Pouch Cell Case

The Aluminum laminated film is mainly a composite material composed of ON/AL/CPP (outer nylon layer/middle aluminum foil layer/inner heat-sealing layer), and the layers are bonded by an adhesive. Aluminum laminated film is one of the key materials for pouch cell lithium battery packaging.It plays a role in protecting the internal battery cell material. It has strict requirements in terms of barrier properties, cold stamping formability, puncture resistance, chemical stability and insulation. Compared with cylindrical and square aluminum shells, soft-pack batteries have obvious advantages in energy density, safety and flexibility, and have been widely used in 3C consumer, new energy vehicles and energy storage fields.

TOB NEW ENERGY provide battery Aluminum laminated film pouch cell packaging materials for lithium-ion polymer pouch cell cases.

The functional structure of aluminum laminated film is generally 3 layers, including the outer nylon layer (ON layer), the middle aluminum foil layer (AL layer), and the inner heat seal layer (CPP layer or PP layer). The main raw materials include nylon, aluminum foil, and polypropylene. CPP and adhesives, etc. The outer ON layer protects the AL layer from scratches, and requires the outer material to be puncture-resistant and impact-resistant; the AL layer acts as a barrier to prevent moisture intrusion and block oxygen to protect the battery contents; the inner layer is an electrolyte-resistant layer to prevent leakage The electrolyte corrodes the AL layer, requiring high composite strength with the aluminum foil layer. The key to the production of aluminum laminated film is to press and bond the three layers of functional materials uniformly and firmly through adhesive additives between the layers.

Therefore, the thickness of conventional aluminum laminated films on the market is generally divided into three levels of 88μm, 113μm, and 153μm, of which 88μm and 113μm are used for consumer electronics, and 153μm is used for new energy vehicle power lithium batteries and industrial energy storage fields.

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