The main components of a prismatic battery module include: a top cover, a casing, a positive plate, a negative plate, a laminated sheet or a winding composed of a separator, an insulator, a safety component, etc. Among them, there are two safety structures, NSD acupuncture safety device and OSD overcharge protection device. Shells are generally steel or aluminum shells. With the market’s pursuit of energy density and the progress of production technology, aluminum shells have gradually become the mainstream.