| 摘要 |
PROBLEM TO BE SOLVED: To provide a measurement method that enables the quick and precise measurement of a remaining capacity of a secondary battery and can easily miniaturize a measuring device, and to provide a measuring device usable for calculating the remaining capacity. SOLUTION: A correlation relationship between a variable corresponding to remaining capacity calculated from impedance and a phase corresponding to an AC signal of each frequency obtained by applying AC signals of two kinds of frequencies to a secondary battery the remaining capacity of which is known in advance, and the remaining capacity is obtained. The correlation relationship between the variable and the remaining capacity is compared with the variable calculated from the impedance and phase corresponding to an AC signal of each frequency obtained by applying AC signals of two kinds of frequencies to a secondary battery the remaining capacity of which is unknown, thus calculating the remaining capacity of the secondary battery the remaining capacity of which is unknown. COPYRIGHT: (C)2011,JPO&INPIT
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