CHARGED STATE MANAGING APPARATUS FOR SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To obtain a charged state managing apparatus for second battery in which the charged state of a second battery being charged/discharged repeatedly at ransom can be detected accurately from the terminal voltage thereof. SOLUTION: The charged state managing apparatus for second battery comprises means for detecting the terminal voltage of a second battery, a table storing relationship between the terminal voltage of the second battery and the charged state thereof, and means for storing the maximum charged state of the second battery. A charged state detecting means determines the charged state SOCx based on the terminal voltage at the time of discharge with reference to the table (steps S3, 4). If the charged state SOCx is lower than a minimum charged state SOCmin stored in the memory means (step S5), the charged state SOCx is outputted as a current charged state SOC (step S7) and the minimum charged state SOCmin is updated by the charged state SOC (step S6).