| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a battery impedance measuring device capable of measuring the internal impedance characteristics of a battery, which is used for a battery monitoring device, in real time and on site such as on an automobile, power plant, and home power storage system. <P>SOLUTION: An impedance measuring device is used for a battery monitoring device that measures and monitors in real time a battery module which includes a plurality of serially connected battery cells and drives an actual load with a load variation including a high frequency band generated. The device comprises: a DFT calculation part that calculates impedance by performing a discrete Fourier transform for voltage waveform data and current waveform data of each of the cells and dividing the discrete Fourier transform result of the voltage waveform data by the discrete Fourier transform result of the current waveform data; and a circuit constant estimation calculation part that performs a weighting calculation for each data on the basis of the impedance, which is calculated by the DFT calculation part, and analysis conditions such as a weighting function and frequency range. <P>COPYRIGHT: (C)2013,JPO&INPIT |
