Battery system electric vehicle The national standard has established conventional performance and functional requirements for power battery systems, including capacity, energy, power, efficiency, standard cycle life, operating cycle life, storage, charge retention, capacity recovery, rate performance, high and low temperature performance, etc. It has also established safety protection requirements, including operational safety, fault protection, personnel electric shock protection, abuse protection, environmental adaptability, accident protection, user manual and special instructions, etc. The scope covers four levels, namely battery cells, modules, power battery packs and power battery systems. Product types include hybrid, plug-in/extended-range hybrid, pure electric passenger vehicles and commercial vehicles, which have basically formed a complete system.