| 摘要 |
PROBLEM TO BE SOLVED: To keep the detection accuracy of remaining capacity at a certain degree or higher even in the case of some dispersion in relaxation time of a secondary battery. SOLUTION: A computing element detects a remaining capacity A based on a battery terminal voltage Vn stored in a memory immediately before charging and discharging is restarted when the period from a state that the charging and discharging to a battery was stopped until it has been restarted(relaxation time) exceeds 10 minutes (steps A4, A5). In addition, a battery current value In detected at every predetermined time is accumulated and when the relaxation time is not more than 10 minutes, the remaining capacity A that was detected based on the terminal voltage Vn stabilized when the relaxation time exceeded 10 minutes and stored in the memory is corrected according to an accumulated value Qn obtained by accumulating the charging or discharging current flowing through the battery before the measurement of the relaxation time was started (steps A4, A12, A7). |
