Patent ID: 8242745
Filing Date: 2012-08-14
Classification: B60L,H01M,H02J,Y02E,Y02T

Abstract:
1. A battery management system for a battery pack comprising a plurality of battery modules, each of said battery modules comprising a plurality of battery cells, said battery management system comprising: a plurality of first balancing units, each of said first balancing units coupled to a respective battery module; a plurality of first controllers, each of said first controllers coupled to a respective battery module and a respective first balancing unit, wherein said first controllers are operable for controlling said first balancing units to adjust voltages of battery cells in said battery module if an unbalance occurs between said battery cells; a second balancing unit comprising a plurality of second balancing circuits, each of said second balancing circuits coupled to a respective battery module; a second controller coupled to said battery modules and said second balancing circuits, wherein said second controller is operable for controlling said second balancing circuits to adjust voltages of said battery modules if an unbalance occurs between battery modules; a detection circuit coupled to a respective battery module and operable for monitoring a voltage of said battery module and determining if an over voltage condition occurs on said battery module; and a third balancing circuit coupled to said battery module and said detection circuit and operable for adjusting said voltage of said battery module if said over voltage condition occurs on said battery module.