Patent ID: 8207740

Claim:
A method for use with a vehicle battery pack having a plurality of battery cells, comprising the steps of: (a) determining a state of charge for the vehicle battery pack (SOC Pack ), wherein the state of charge (SOC Pack ) corresponds to when the vehicle is ‘on’ and generally does not include effects due to diffusion voltage, hysteresis voltage or both; (b) determining a terminal voltage for at least one of the vehicle battery pack (V Pack ) or the plurality of battery cells (V Cell ), wherein the terminal voltage (V Pack ) or (V Cell ) corresponds to when the vehicle is ‘off’ and generally does include effects due to diffusion voltage, hysteresis voltage or both; and (c) using the state of charge (SOC Pack ) and the at least one terminal voltage (V Pack ) or (V Cell ) to determine an average transient voltage effect for the plurality of battery cells.