aaa alkaline battery.Analyze the importance of aluminum plastic film from the production and packaging process of soft-pack lithium batteries

　　The soft-packed batteries we have seen so far are all batteries that use aluminum-plastic film as packaging material. Broadly speaking, lithium-ion soft-packed batteries are divided into two categories. One type uses aluminum-plastic film as packaging. Batteries, the other type is metal-cased batteries, and metal-packaged batteries include steel shells, aluminum shells, etc.

　　1. Soft-packed batteries

　　The soft-packed batteries we have seen so far are all batteries that use aluminum-plastic film as packaging material. Broadly speaking, lithium-ion soft-packed batteries are divided into two categories. One type uses aluminum-plastic film as packaging. Batteries, the other type is metal-cased batteries, and metal-packaged batteries include steel shells, aluminum shells, etc.

　　Different outer packaging materials determine the use of different packaging methods. Polymer soft-packed batteries use thermal packaging, while metal-packed batteries use welding methods.

　　2. Packaging soft film-aluminum plastic film

　　The aluminum-plastic composite film can be roughly divided into three layers - the inner layer is an adhesive layer, mostly made of polyethylene or polypropylene, which plays a sealing and bonding role; the middle layer is aluminum foil, which can prevent the penetration of water vapor from the outside of the battery and prevent the internal Leakage of electrolyte; the outer layer is a protective layer, which is mostly made of polyester or nylon materials with high melting points. It has strong mechanical properties, prevents damage to the battery from external forces, and plays a role in protecting the battery.

　　The research and development of high-quality aluminum-plastic composite films is the key to the successful development of liquid flexible packaging lithium-ion batteries, a high-tech product. As the shell of liquid flexible packaging lithium-ion batteries, the aluminum-plastic composite film is no longer just a simple outer packaging of the battery, but also an indispensable and important component of liquid flexible packaging lithium-ion batteries.

　　If the importance of this flexible packaging material is not fully understood, it will be detrimental to the design and development of flexible packaging batteries. It plays such an important role in the development of liquid flexible packaging lithium-ion batteries, which shows that the product has high technical content and is qualitatively different from ordinary composite packaging materials in terms of design, manufacturing and application.

　　Domestic and foreign manufacturers are working hard to continuously improve their products, and the production technology of aluminum-plastic composite films is also under continuous research and development.

　　3. Aluminum plastic film stamping forming process

　　Soft-packed batteries can be designed into different sizes according to customer needs. After the outer dimensions are designed, corresponding molds need to be opened to stamp the aluminum-plastic film. The forming process is also called pit punching, which uses a forming mold to punch out a pit on the aluminum-plastic film that can be used to roll the core.

　　After the aluminum plastic film is punched, it is cut and formed, generally called a pocket bag. Generally, when the battery core is thin, you choose to punch a single pit. When the battery core is thick, you choose to punch a double pit. When punching the double pit, it will be due to the deformation of one side. The assembly breaks through the deformation limit of the aluminum-plastic film and causes rupture.

　　Sometimes, according to design requirements, a small pit will be made on one side of the pit to expand the volume of the air bag.

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