METHOD AND APPARATUS FOR CALCULATING RELATIVE STATE-OF-CHARGE OF BATTERY

A method of calculating a relative state-of-charge (RSOC) of a battery according to the disclosure includes measuring at least one parameter of the battery, based on the at least one parameter, estimating a state-of-charge (SOC) of the battery, based on the SOC, SOC-open circuit voltage (SOC-OCV) data of the battery, and the at least one parameter, estimating a non-dischargeable capacity of the battery, based on the non-dischargeable capacity of the battery, the SOC, and intrinsic capacity of the battery, estimating an available SOC (AvSOC) of the battery, based on the SOC and the AvSOC of the battery, determining the RSOC of the battery, and based on a ratio of the RSOC to the AvSOC, updating the RSOC of the battery.