Patent ID: 9046583
Filing Date: 2015-06-02
Classification: G01R,H01M,Y02E

Abstract:
1. A method for estimating a cathode voltage of a secondary battery which includes a cathode comprising a first cathode material and a second cathode material with different operating voltage ranges, the method comprising: providing a circuit model comprising a first cathode material circuit and a second cathode material circuit connected to the first cathode material circuit in parallel, each circuit corresponding to the first cathode material and the second cathode material, respectively; measuring a current of the secondary battery; calculating a current flowing through the first cathode material circuit and the second cathode material circuit based on the circuit model while a current of the secondary battery is flowing; calculating an open-circuit voltage according to SOC of the first cathode material and optionally an impedance voltage according to an impedance component of the first cathode material based on the current flowing through the first cathode material circuit; calculating an open-circuit voltage according to SOC of the second cathode material and optionally an impedance voltage according to an impedance component of the second cathode material based on the current flowing through the second cathode material circuit; and estimating the cathode voltage by using the open-circuit voltage and optionally the impedance voltage calculated for each circuit.