Battery equalization system and method applied to energy storage device

The invention relates to the technical field of battery control, in particular to a battery equalization system and method applied to an energy storage device. The battery equalization system applied to the energy storage device comprises a temperature sensing module used for sensing the temperature of each battery unit; the internal resistance analysis module is used for obtaining a corresponding adjusting resistance according to the temperature of the current battery unit; and the internal resistance control modules are used for adjusting the internal resistance of the corresponding battery units according to the adjusting resistance, and the internal resistance control modules are in one-to-one correspondence with the battery units. The internal resistance of the battery unit is adjusted according to the sensing temperature of the battery, and the internal resistance can be adjusted aiming at the battery unit, so that the calorific value of the battery unit is changed, the calorific value can be effectivel