Patent ID: 7764049
Filing Date: 2010-07-27
Classification: G01R

Abstract:
1. A method for determining battery discharge capability based on an equivalent circuit of a battery, comprising: setting a state vector, including at least element parameters and a predetermined function of the element parameters of the equivalent circuit; measuring a current value and a voltage value of the battery; estimating the state vector using the measured current value and the measured voltage value, and a state of charge (SOC) calculated by a predetermined SOC calculating method as observed values; applying the element parameters, calculated according to the predetermined function at a predetermined current pattern, as elements of the estimated state vector to the equivalent circuit to estimate the voltage value of the battery at a time of discharging under the predetermined current pattern, and the predetermined current pattern includes a present discharge current and a current of a load to be newly added to the present discharge current applied to the battery; and comparing the estimated voltage value with a predetermined voltage tolerance to determine the discharge capability of the battery.