Patent ID: 9130377
Filing Date: 2015-09-08
Classification: H02J

Abstract:
1. A system for managing a battery pack, the battery pack comprising a plurality of battery cells with a corresponding plurality of depth of discharge values, the system comprising: a bypass circuit operatively coupled with the battery cells, the bypass circuit comprising: a plurality of switching devices and a plurality of energy storage components, the switching devices individually operable according to a corresponding switching control signal in a first state to cause conduction of bypass current from at least one of the battery cells to at least one of the energy storage components and in a second state to allow conduction of bypass current from at least one of the energy storage components to at least another one of the battery cells; and a switching controller operative to provide a plurality of switching control signals to the switching devices of the bypass circuit at a switching frequency for a corresponding plurality of on times in each of a plurality of periodic time intervals for active balancing of the battery cells; and a predictive balancing component operative to compute the plurality of on times as a function of a plurality of initial balancing bypass current values to balance the plurality of depth of discharge values by a prospective end of charge or end of discharge time, and as a function of a plurality of continuous balancing bypass current values to maintain a present relationship of the plurality of depth of discharge values.