Patent ID: 8269502

Claim:
A method for determining the state of health (SOH) of a battery comprising at least one rechargeable cell, the method including the steps of: determining a state of charge (SOC) for at least one cell; determining in real time an impedance of at least one cell (R mes,n ); determining at least one confidence coefficient accounting on reliability of the impedance as a function of at least one variable selected from current, temperature or state of charge of the at least one rechargeable cell, or the derivatives or integrals thereof with respect to time; determining in real time the state of health of the battery at a given point in time (SOH n ), using the state of health of the battery at a preceding point in time (SOH n -1 ) corrected as a function of said impedance at the given point in time (R mes,n ) and weighted by the at least one confidence coefficient; controlling at least one of charging and use of the battery based on the determined state of health of the battery.