Patent ID: 8515700

Claim:
A method for estimating the SOH of a battery of a vehicle, the method comprising the step of: (a) measuring temperature of the battery at predetermined intervals and storing the measured temperatures with respect to time in a temperature distribution data in a memory of a controller of the battery; (b) determining at predetermined intervals whether a time for which the temperature distribution data is stored exceeds a reference time; (c) calculating severity grades according to temperatures from the temperature distribution data, if it is determined that the time exceeds the reference time; (d) calculating deterioration values for a current traveling distance of the vehicle from a traveling distance deterioration map showing degree of deterioration of the battery measured for each traveling distance of the vehicle and estimating degree of deterioration for the current traveling distance and temperature of the vehicle by multiplying the calculated severity grades by the calculated deterioration values; and (e) estimating the SOH of the battery from the estimated degree of deterioration.