What is lithium battery aluminum plastic film? What is its role?
The packaging material used in soft lithium battery is aluminum-plastic composite film, which is mainly used in the packaging of soft lithium ion battery core. a soft-packed lithium battery encapsulated with aluminum plastic film is mainly used in 3 C fields. in recent years, it has gradually penetrated into the new energy automobile industry, providing a safe and stable power output for each type of vehicle.
At present ,90% of the domestic market is mainly monopolized by Japanese DNP/ Zhaohe electrician, Korean chestnut village and other Japanese and Korean enterprises. Domestic enterprises, such as new fiber technology, Buddha plastic technology and other companies, are also speeding up the development and production of aluminum plastic film, but there is still a certain gap compared with Japanese and Korean enterprises. The thickness of aluminum plastic film has different specifications, its structure is mainly composed of three materials, from inside to outside are CPP layer, Al layer, nylon layer.
There are two main manufacturing methods of aluminum plastic film: thermal method and dry method. The thermal process is MPP bonding between aluminum layer and CPP layer and hot pressing synthesis at a certain temperature. At high temperature MPP van der Waals force is destroyed, aging, short circuit resistance will decline sharply. At the same time, due to the destruction of its intermolecular structure, the toughness decreases and it is easy to break during the molding process.
Dry process is to add binder directly between PP and aluminum layer, using insulating binder, so the short circuit resistance is better than that of thermal process without high temperature treatment. And the ductility of the binder itself is better than that of the PP layer, and the high temperature treatment does not affect the molding.
As the core material of secondary battery, aluminum plastic film is famous for its high technical barrier and high income. The market has a rapid growth rate (CAGR) of 42% per year.
As it is understood that the production process of aluminum-plastic film is difficult, most domestic aluminum-plastic film in the resistance to electrolyte corrosion, bath performance and other aspects of failure, so the global and domestic aluminum-plastic film market is mainly by the Japanese DNP printing, Japanese Zhaohe electrician and a few Japanese enterprises monopoly.
However, with the progress of domestic battery technology, domestic aluminum plastic film has made great progress. For example, on the basis of the rich experience accumulated in the development of solar cell backplane film adhesive, the new material has successfully developed lithium battery aluminum plastic film using imported aluminum plastic film adhesive. A large number of material screening and formula optimization tests have been carried out, and products that can replace imported adhesives have been successfully developed. The successful development and use of the adhesive not only breaks the technical monopoly of the same industry abroad, but also makes the aluminum plastic film completely domestic and take a big step forward.
