Power is the amount of energy converted or output within a unit of time, reflecting the ‘fast’ ability of batteries or electrical power systems. The commonly used unit is Watt (Watt, W), and in the power system, it is usually measured in kilowatts (kW), megawatts (MW), and so on. In battery applications, power is a key indicator for measuring its instantaneous output or input capacity, which directly affects the acceleration of electric vehicles and the frequency response speed of energy storage systems and other performance.
