CELL BALANCING SYSTEM FOR EQUALIZING STATE OF CHARGE AMONG SERIES-CONNECTED ELECTRICAL ENERGY STORAGE UNITS

摘要

A system and method of balancing state of charge among plural series connected storage unit is provided. Individual storage units are selectively coupled by semiconductor switches for monitoring and balancing state of charge. When the state or charge of a selected unit is different than a target state of charge, energy is transferred between the selected unit and the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge. System and method is provided for determining state of charge and for balancing state of charge among plural series connected storage units. A power converter is provided for equalizing state of charge to a target state of charge in a non-dissipative manner.