What are the materials and processes of the soft pack lithium battery assembly?

There are generally two types of packaging methods for soft-packed lithium batteries: forming packaging and non-forming packaging. Forming packaging is a box packaging method. This packaging method is first to punch the packaging material into a box shape. The depth of the box depends on the battery. During the forming process, the aluminum foil and other composite materials extend and flow, which requires The peel strength of different composite layers is relatively high to guard against delamination during the molding process, and the aluminum foil will become thinner during the stretching process. Generally speaking, the forming depth of 40um thick aluminum foil should not exceed 4mm, and the thickness of the aluminum foil after forming should not be less than 30um. The non-formed packaging method has relatively low requirements for ductility and thickness of the aluminum box because the material is not extended. The heat-sealing process parameters of the soft-packed lithium battery soft-packaging material are critical. There are heat-sealing time, heat-sealing pressure and heat-sealing temperature. Generally, the application of new packaging materials must readjust these three parameters to maximize the heat-sealing effect. good. The better heat-sealing time and heat-sealing temperature of the soft-packed lithium battery soft-packing material are the same, and the better heat-sealing pressure can be found by changing the pressure. Of course, you can’t just pursue the heat-sealing strength. On the basis of the heat-sealing strength that can meet the requirements, considering the influence of heat radiation and heat conduction on the battery performance, the shorter the heat-sealing time, the better, and the lower the heat-sealing temperature, the better. The heat-sealing seals of flexible packaging materials are mostly in the form of concave-convex molds, and the tabs are in the form of rubber blocks. The concave-convex mold controls the heat-sealing effect by controlling the thickness of the packaging material after heat-sealing. By controlling the thickness, it can be guarded. Deeply make the tabs contact the aluminum foil and cause a short circuit, which can effectively control the heat sealing effect. The rubber block is attached to the tab first. The material of the rubber block is generally the same as the inner material of the packaging material. The part of the rubber block in contact with the tab will not melt during heat sealing, which not only maintains the original peel strength, but also prevents short circuits. The outer layer and the packaging material are heat-sealed together. Because they are the same material, the heat-sealing effect is very good. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Decompose the application fields of ternary lithium batteries