Aluminum-plastic film is the key material of soft packaging lithium battery core packaging. After the single battery is assembled, it is sealed with aluminum-plastic film to form the battery, which plays a role in protecting the contents. Compared with packaging materials such as steel shell, aluminum shell or plastic shell, aluminum-plastic film has the advantages of light weight, thin thickness and flexible shape design, and has been widely used in 3C consumer electronics, power batteries, energy storage and many other fields.
Extended data:
Due to the existence of electrolyte in the battery, flexible packaging materials are required to resist the swelling, dissolution and absorption of organic solvents, and at the same time, it is required to strictly block oxygen and moisture. Therefore, aluminum-plastic film is not only the simple outer packaging of flexible battery, but also one of the important components of flexible lithium battery. If the package is damaged, it is likely to bulge or even leak, and the battery will not be used.
Therefore, the design, manufacture and application technology of aluminum-plastic film materials are qualitatively different from ordinary composite packaging materials, and its technical difficulty exceeds that of separator, positive electrode, negative electrode, electrolyte and aluminum-plastic film, which is also a technical difficulty link in the field of lithium-ion battery materials, and the comprehensive gross profit margin can reach more than 40%.
Reference source: Baidu Encyclopedia-Aluminum-Plastic Composite Film