Patent ID: 9160185
Filing Date: 2015-10-13
Classification: B60L,H01M,H02J,Y02E,Y02T

Abstract:
1. An apparatus comprising: a battery system having a nominal system voltage, the battery system further comprising a plurality of packs each including a plurality of cells, the plurality of packs having nominal pack voltages that when added substantially equal the nominal system voltage; an H-bridge circuit having the nominal system voltage as an input from a power source external to the battery system, the H-bridge generating differential alternating square wave voltage outputs provided via a balancing power bus to a plurality of step-down transformers each associated with a pack, the plurality of step-down transformers providing an active balancing voltage of about the associated nominal pack voltage; and a plurality of balancing transformers each associated with a respective pack, the plurality of balancing transformers each including a common primary coil receiving the active balancing voltage from the associated step-down transformer or the pack, and a plurality of secondary coils each associated with a respective one or more of the plurality of cells of the respective pack.