This rectangle battery cell adopts a multi-layer structure and safety design, consisting of positive electrode, negative electrode, positive electrode shell, insulation layer, sealing cover, and other components. there are safety structures such as needle piercing non explosion safety devices and overcharging protection devices, which have high energy density, regular shape, convenient stacking and combination, and can achieve more diverse battery assembly methods, flexibly applied to various devices and scenarios.it has the following advantages: Safety - the structural design of square cells can better protect the materials and structure inside the cells, thereby improving the safety of the battery. Packaging reliability - the packaging reliability of rectangle battery is high, and the system energy efficiency is high. Lightweight - compared to other types of battery, rectangle lithium battery cells are lighter in weight. Long lifespan - rectangle cells typically have a longer lifespan and can withstand multiple charging and discharging cycles. Easy to expand - the rectangle cell structure is relatively simple and easy to expand. energy density can be improved by increasing the capacity of individual cells.