SECONDARY BATTERY CHARGE STATE ESTIMATION METHOD AND SECONDARY BATTERY CHARGE STATE ESTIMATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery charge state estimation method and a secondary battery charge state estimation device having high estimation accuracy.SOLUTION: A method for estimating a charge state of a secondary battery on the basis of an open voltage value and a current integrated value, comprises updating an instantaneous charge state map defining a relation between an instantaneous open voltage value and a charge state estimation value at a time of estimating the charge state on the basis of charge/discharge characteristic data after start of using the secondary battery; calculating the instantaneous charge state estimation value at the time of estimating the charge state; calculating a charge state estimation value on the basis of an integrated value of a current flowing in the secondary battery; and calculating a control charge state estimation value for used in control over the secondary battery on the basis of the charge state estimation value based on the instantaneous charge state estimation value and the current integrated value.SELECTED DRAWING: Figure 2