Patent ID: 8358136
Filing Date: 2013-01-22
Classification: G01R,H01M,H02J,Y02E

Abstract:
1. In a rechargeable energy storage system ( 230 ) characterized by a series arrangement (S 1 , S 2 , . . . S n ) of multiple battery cells (C 1 , C 2 , . . . C n ), multiple individual energy dissipative devices (D 1 , D 2 , . . . D n ) each associated with and selectively connectable and disconnectable (SW 1 , SW 2 , . . . SW n ) in parallel with a respective one of the multiple battery cells (C 1 , C 2 , . . . C n ), circuitry ( 240 , V c1 , V c2 , . . . V cn ) for measuring the voltage (V cell 1 ) across each of the respective ones of the multiple battery cells (C 1 , C 2 , . . . C n ), and circuitry ( 240 , 36 ) for measuring the magnitude and direction of current (I bat ) flowing through the series arrangement of multiple battery cells and any dissipative devices connected in parallel therewith, a method of providing a measure of current flow (I batnet ) through substantially only the multiple battery cells comprising the steps of a) establishing a respective predetermined impedance (R) for each of the energy dissipative devices (D b) determining ( c) determining ( d) determining ( e) summing ( f) subtracting (