Analysis of the structure, advantages and disadvantages of square lithium batteries

1. The structure of a prismatic lithium battery A typical prismatic lithium battery has important components including: a top cover, a casing, a laminate or winding composed of a positive electrode plate, a negative electrode plate, and a separator, insulators, safety components, etc. Among them, the two in the red circle are safety structures, NSD acupuncture safety device; OSD overcharge protection device. Acupuncture safety protection device. This is a metal layer, such as copper foil, is added to the outermost surface of the core. When acupuncture occurs, the local large current that appears at the acupuncture site quickly reduces the current per unit area through the large area of u200bu200bthe copper sheet, so that local overheating of the acupuncture site can be guarded and the thermal runaway of the lithium battery can be slowed down. Overcharge safety protection device, the current safety design can be seen on many batteries. Generally it is a metal sheet, used with the fuse, the fuse can be designed on the positive current collector, the pressure inside the lithium battery during overcharge causes the OSD to trigger an internal short circuit, and an instantaneous large current occurs, which causes the fuse to fuse, thereby cutting off the internal current loop . The shell is generally a steel shell or an aluminum shell. With the drive of the market for energy density and the progress of processing technology, the aluminum shell has gradually become the mainstream. 2. What are the advantages and disadvantages of square lithium batteries? Advantages: high reliability of prismatic lithium battery packaging; high system energy efficiency; relatively light weight and high energy density; simple structure and relatively convenient expansion. It is currently an important option to increase energy density by increasing monomer capacity; monomer capacity Larger, the system configuration is relatively simple, which makes it possible to monitor the monomers one by one; another advantage brought by the simple system is relatively good stability. Disadvantages, because prismatic lithium batteries can be customized according to the size of the product, there are thousands of models on the market, and because there are too many models, the process is difficult to unify; the level of processing automation is not high, and the monomer difference is relatively high Large, in large-scale applications, there is a problem that the life of the system is much lower than the life of the monomer. 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: Which new materials can improve the performance of lithium batteries?