METHOD AND APPARATUS FOR COMPUTING VIRTUAL CURRENT OF BATTERY, METHOD AND APPARATUS FOR COMPUTING OPEN-CIRCUIT VOLTAGE IN BATTERY, AND METHOD AND APPARATUS FOR COMPUTING BATTERY CHARGED STATE

摘要

PROBLEM TO BE SOLVED: To accurately compute a virtual current for calculating the open circuit voltage of a battery. SOLUTION: Voltage-current characteristics including the influence of polarization determined from the a current value sufficient for canceling polarization at a charging side, or a discharge current of discharge by the quantity of electricity, and a terminal voltage by a polarization influence characteristic calculating means 23A are shifted in the direction of a voltage axis by a means 23B for calculating the polarization influence characteristics after shifting so that a voltage value at the reference current value on the characteristics coincides with a reference voltage value at a reference current value on voltage-current characteristics without including the influence of polarization depending on only the pure resistance of a battery 13. A computing means 23C performs computation as a virtual current Is for determining an open circuit voltage OCV in the battery 13 by substituting the current value corresponding to the voltage value at a discharge current=0 on the voltage-current characteristics without including the influence of polarization on the voltage-current characteristics after shifting for a voltage-current characteristic expression including the influence of polarization. COPYRIGHT: (C)2005,JPO&NCIPI