Most of the commonly used soft pack cells in daily life are cells using aluminum plastic film as packaging material, which is one of the key materials for soft pack lithium-ion battery packaging. It plays a role in protecting internal cell materials and has strict requirements in terms of barrier, stamping formability, puncture resistance, chemical stability, and insulation. But I am not particularly familiar with aluminum plastic film composite films. Today, the editor will explain in detail what aluminum plastic composite films are.
1、 What is aluminum plastic composite film
Aluminum plastic composite film, abbreviated as aluminum plastic film, mainly consists of raw materials such as nylon, aluminum foil, polypropylene CPP, and adhesives. A composite material composed of ON/AL/CPP (outer nylon layer/middle aluminum foil layer/inner heat sealing layer), with layers bonded by adhesives. The external ON layer protects the AL layer from scratches and requires the outer material to be puncture and impact resistant; The AL layer serves as a barrier to prevent moisture intrusion and block oxygen to protect the contents of the battery; The inner layer is an electrolyte resistant layer to prevent leakage of electrolyte from corroding the AL layer, and requires high composite strength with the aluminum foil layer. The key to producing aluminum plastic films is to press and bond the three layers of functional materials evenly and firmly through adhesive additives between layers.
2、 Performance characteristics
Good flexibility, moisture-proof, oxygen proof, shading, shielding, anti-static, vacuum proof, and color printing.
Each structure uses different materials, resulting in different final performance. The indicators may differ by 10 times or even a hundred times.
3、 Thickness of aluminum plastic composite film
Therefore, the thickness of conventional aluminum plastic films in the current market is generally divided into 88 μ m. 113 μ m. 153 μ M third gear, of which 86 μ M and 113 μ Two levels of m are used for consumer electronics products, 153 μ M is used in the field of Alternative fuel vehicle power lithium battery and industrial energy storage.
4、 Application of aluminum plastic composite film
Aluminum plastic film can be divided into food grade aluminum plastic film and lithium battery aluminum plastic film according to their usage.
Food grade aluminum plastic film is a common packaging material, such as potato chip outer packaging bags, capsule outer packaging, etc.
Lithium aluminum plastic film has been widely used in 3C consumer products, new energy vehicles, and energy storage fields. The aluminum plastic film process for polymer soft pack lithium batteries is very difficult.
5、 Preparation process of aluminum plastic film
The preparation of aluminum plastic film mainly includes two methods: dry method and thermal method. The dry process is formed by directly pressing aluminum and polypropylene bonded with adhesive. The thermal process is formed by bonding aluminum and polypropylene with MPP and slowly increasing temperature and pressure through hot pressing.
The research and development of high-quality aluminum plastic composite film is the key to the successful development of liquid soft packaging lithium-ion batteries, a high-tech product. As the outer shell of a liquid soft packaged lithium-ion battery, the aluminum plastic composite film is no longer just a simple outer packaging of the battery, but also an indispensable and important component of the liquid soft packaged lithium-ion battery.