| 摘要 |
<P>PROBLEM TO BE SOLVED: To simply and accurately diagnose the deteriorated state of a secondary cell in an electric vehicle etc. Ž<P>SOLUTION: This diagnostic device for the deteriorated state of a secondary cell includes a capacitor 25, a voltage impression means 21 for changing a voltage at prescribed frequencies with the capacitor 25 used as a power supply to apply the voltage to the secondary cell and charging/discharging the secondary cell at a prescribed frequency, a frequency changing means 21, current and voltage detection means 21a and 21b for detecting a response voltage and response current of the secondary cell for each of the frequencies, a computing means 21 for computing internal impedance of the secondary cell at each of the frequencies from the response voltage and response current to calculate reaction resistance Rct based on the internal impedance, and a comparison means 21 for comparing the reaction resistance Rct with a reaction resistance value serving as a reference. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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