APPARATUS AND METHOD FOR ESTIMATING STATE OF SECONDARY BATTERY CONSIDERING AGING

摘要

A device and a method for estimating the state of a secondary battery are provided. The device determines a standard first open circuit voltage (OCV) curve for a first electrode and a standard second OCV curve for a second electrode. The device shifts the standard second OCV curve according to a capacity reduced by the degradation of the secondary battery and determines a shifted second OCV curve. The device determines a cell OCV curve based on the standard first OCV curve and the shifted second OCV curve and estimates the charging state of the secondary battery. [Reference numerals] (S410) Determine standard first and second OCV curves;(S420) Determine the reduction of capacity due to the degradation of the secondary battery;(S430) Shift the standard second OCV curve according to the reduced capacity;(S440) Determine a cell OCV curve on the basis of the standard first OCV curve and the shifted second OCV curve;(S450) Estimate a charging state