Abstract: A battery pack, a method of controlling the same, and an energy storage system including the battery pack are disclosed. According to some aspects, the method may include calculating charge capacities of the battery cells, obtaining a first average value, which is an average value of the calculated charge capacities, establishing a first standard value for selecting an abnormal battery cell based on the first average value and determining a first battery cell having the lowest charge capacity from among battery cells having charge capacities greater than the first standard value. A second standard value for selecting a battery cell that is to be discharged during a cell balancing operation may be established. A cell balancing operation with respect to battery cells having charge capacities greater than the second standard value may then be performed. Accordingly, a cell balancing operation may be effectively performed in order to efficiently manage a battery pack.

Abstract: A battery pack is disclosed. The battery pack includes a first battery cell group having a plurality of battery cells, and a second battery cell group having a plurality of battery cells. The battery pack also includes a first impedance unit serially connected to the first battery cell group, a second impedance unit serially connected to the second battery cell group, and a battery management unit respectively determining a degree of deviation of the first battery cell group and the second battery cell group to adjust impedances of the first impedance unit and the second impedance unit. Accordingly, a decrease in performance due to deviation difference between batteries may be prevented.

Abstract: A battery pack, a method of controlling the same, and an energy storage system including the battery pack are disclosed. According to some aspects, the method may include calculating charge capacities of the battery cells, obtaining a first average value, which is an average value of the calculated charge capacities, establishing a first standard value for selecting an abnormal battery cell based on the first average value and determining a first battery cell having the lowest charge capacity from among battery cells having charge capacities greater than the first standard value. A second standard value for selecting a battery cell that is to be discharged during a cell balancing operation may be established. A cell balancing operation with respect to battery cells having charge capacities greater than the second standard value may then be performed. Accordingly, a cell balancing operation may be effectively performed in order to efficiently manage a battery pack.