CHARGE/DISCHARGE CURVE ESTIMATION DEVICE AND CHARGE/DISCHARGE CURVE ESTIMATION METHOD FOR STORAGE BATTERY

摘要

To provide a charge/discharge curve estimation device capable of estimating a charge/discharge curve for various current rates of various secondary batteries to solve the problem of conventional charge/discharge curve estimation devices which requires re-estimation when a current rate is changed because the charge/discharge curve of the secondary battery can be estimated only for a current rate of a specific charge/discharge current.SOLUTION: The charge/discharge curve estimation device derives an initial open end voltage function and an approximate curve of an initial impedance function that are to be initially corrected, and sets them as preliminary estimation functions. After a start of charge and discharge, a measurement section measures charge/discharge voltages and charge/discharge currents at a constant interval. An SOC calculation section calculates the SOC value simultaneously with the measurement of the charge/discharge voltages. An estimated calculation processing section obtains an estimation error between a preliminarily estimated voltage obtained from the preliminary estimation functions and an actual measurement voltage, calculates a posteriori estimation value by applying to the obtained estimation error and a current value, a correction expression using a learning rate Ldetermined in advance and a Gaussian function having a correction width σ as a term, corrects the preliminary estimation function on the basis of the obtained posteriori estimation value, sets a new preliminary estimation function, and estimates a charge/discharge curve.SELECTED DRAWING: Figure 1