| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for measuring an internal impedance of a storage battery without increasing costs in the measurement of an electromotive force component to be measured, in the case the frequency of current to be measured is fairly close to the frequency of a noise component. SOLUTION: An apparatus 10 for measuring the internal impedance of the storage battery is used, which has a common control section 13 for controlling both an AC current generating means 11 and an AC voltage measuring means 12. The AC voltage measuring means 12 comprises; a BPF 14 which filters prescribed frequencies; an A/D converting section 15 which converts an analog signal passing through the BPF 14 into a digital signal; a digital filter 16 which applies digital filter processing to an output signal of the A/D converting section 15; and an arithmetic section 17 which computes a value of the electromotive force component from an output value of the digital filter 16. The digital filter 16 is configured such that frequencies to be processed are adjustable within a range of the frequency pass band of the BPF 14. COPYRIGHT: (C)2007,JPO&INPIT
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