Patent ID: 7928735
Filing Date: 2011-04-19
Classification: B60L,G01R,H01M,Y02E,Y02T

Abstract:
1. A method for tracking the state of health and state of charge of a particular battery as it experiences numerous charge/discharge cycles over its lifetime, comprising the following steps: providing an instrument to be connected to the particular battery and capable of evaluating a parameter indicative of the capability of the particular battery at intervals during charge/discharge cycles over the lifetime of the particular battery and of storing the values of said parameter, and using said instrument to perform the following steps, performed without operator intervention: evaluating said parameter indicative of the capability of the particular battery at intervals during charge/discharge cycles experienced by the particular battery, yielding a series of values Ca; tracking the series of values evaluated for Ca during a particular charge/discharge cycle experienced by the particular battery, and selecting the maximum value reached in the series of values as Ce; tracking the values reached by Ce over the lifetime of the particular battery and selecting the maximum value reached as Cm; determining the state of health of the particular battery by comparing Ce and Cm; and determining the state of charge of the particular battery by comparing Ca and Ce, or by comparing Ca to Cm.