A battery cell balancing method with linear mode bypass current control

Abstract

A study of a novel control method for a battery cell equaliser, based on the shunting transistor method is presented. The method allows cell balancing in both battery operating modes, recharging and driving modes. To verify the applicability of the method, computer simulation was conducted analysing how the system balances during a driving period, by following a real current profile measured from a real REVAi driving. The obtained results show how at the end of the driving period the system is already balanced, allowing a subsequent high speed charge and avoiding a later equalisation stage. Finally, the integration of the balancing system into a higher level system, based on a multiport converter topology is discussed.