ENERGY STORAGE DEVICE

Provided is an energy storage device. The energy storage device includes a power bus, a first battery module, a second battery module, a first charging and discharging circuit, a second charging and discharging circuit, and a control circuit. The first charging and discharging circuit receives power located on the power bus and a first battery state of the first battery module to provide a first sensing signal. The second charging and discharging circuit receives the power located on the power bus and a second battery state of the second battery module to provide a second sensing signal. The control circuit controls the first charging and discharging circuit to execute a first power transmission operation on the first battery module and controls the second charging and discharging circuit to execute a second power transmission operation on the second battery module according to the first sensing signal and the second sensing signal.