METHOD FOR ESTIMATING CAPACITY MAINTENANCE RATE OF SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method for estimating the capacity maintenance rate of a secondary battery in high accuracy.SOLUTION: The method includes: a first step (STEP1-4) of sequentially estimating a deterioration rate y' which is a temporal change rate of the capacity maintenance rate of a secondary battery 1, with a time interval by the following formula (A); and a second step (STEP5) of estimating a capacity maintenance rate y of the secondary battery 1 by using an estimated value of the deterioration rate y'. y'=(c/(1-y))*(a*b+z)...(A)