DEVICE FOR ESTIMATING THE CHARGE / DISCHARGE CURVE AND METHOD FOR ESTIMATING THE CHARGE / DISCHARGE CURVE OF A RECHARGEABLE BATTERY

摘要

A charge / discharge estimator derives an approximate curve of an initial open voltage function and an initial impedance function and sets them as a previous estimator to be corrected a first time. A measuring unit measures a charge-discharge voltage and a charge-discharge current in a cycle with a predetermined time. An SOC calculation unit calculates an SOC value simultaneously with the measurement of the charge-discharge voltage. An estimation calculation processing unit obtains an estimated error between a measured voltage and a previous estimated voltage obtained from the previous estimation function, and obtains a post-estimated value by adding a correction expression using a Gaussian function having a predetermined value to the calculated estimated error and a current value Applies learning rate LR and correction width σ as terms, corrects the previous estimator based on the calculated post-estimate, sets a new previous estimator, and estimates a charge / discharge curve.