Introduction to the basic structure and advantages and disadvantages of soft pack batteries

The basic structure of soft-pack batteries The basic structure of soft-pack batteries is similar to that of cylinders and squares. They are all positive electrodes, negative electrodes, separators, insulating materials, positive and negative electrode tabs and shells, but the subject of soft-pack batteries is aluminum-plastic film. The structure of the aluminum-plastic film is shown in the figure above: the outermost layer is a nylon layer, the middle is an aluminum foil, and the inner layer is a heat-sealing layer, and each layer is bonded with an adhesive. The aluminum-plastic film is required to have the following characteristics: extremely high barrier properties; good heat-sealability; the material is resistant to electrolyte and strong acid corrosion; and has good ductility, flexibility and mechanical strength. Advantages of soft-pack battery Soft-pack battery, aluminum-plastic film has a large deformation space, unlike the steel shell aluminum shell battery cell that will explode when thermally out of control; the shell is a layer of aluminum plastic film, light weight, and the proportion of inactive parts Small, the weight of the soft pack battery is 40% lighter than the steel shell lithium battery of the same capacity, and 20% lighter than the aluminum shell battery; the capacity of the soft pack battery is larger than that of the steel shell battery of the same size and size. The capacity of the soft pack battery is 10~ 15%, which is 5-10% higher than the aluminum shell battery; the shell strength is low, and the mechanical stress on the internal structure during the cycle is small, which is beneficial to the cycle life (of course, when no additional stress is applied during the group design ); The position of the tabs is sufficient, and the heat is evenly distributed during the charging and discharging process. The shortcomings of soft-pack batteries have low shell strength and strong dependence on group technology; compared with the winding production method, the production efficiency of laminated sheets is relatively low; the general production process of soft-pack batteries is because the outer shell is aluminum-plastic film. The production process is different from the other two types of commercial batteries in some respects. For example, the packaging process of aluminum plastic film, such as the shaping process in the forming process. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: The working principle of dry batteries and the introduction of the classification of zinc-manganese dry batteries