Patent ID: 8854008

Claim:
A state of charge balancing system for a battery pack, said state of charge balancing system comprising: a monitoring module for collecting state of charge data for each cell in the battery pack, said monitoring module providing signals representing a state of charge of each cell in the battery pack and a mean state of charge for all cells in the battery pack, for a current power-up and a previous power-up; a feedback control module responsive to the signals from the monitoring module, said feedback control module being configured to compute a feedback control effort for each cell in the battery pack, where the feedback control effort accounts for an energy storage capacity of each cell in the battery pack; a feedforward control module responsive to the signals from the monitoring module, said feedforward control module being configured to compute a feedforward control effort for each cell in the battery pack, where the feedforward control effort accounts for a relative state of charge of each cell in the battery pack; and a cell balancing hardware module responsive to signals from the feedback control module and the feedforward control module, where said cell balancing hardware module uses a sum of the feedback control effort and the feedforward control effort to balance the state of charge of each cell in the battery pack.