FUEL CELL DIAGNOSIS DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a fuel cell diagnosis device capable of diagnosing a supply state of a reaction gas for a fuel cell with accuracy.

SOLUTION: A fuel cell diagnosis device has: a signal application part 431 applying AC signals in different frequency domains to a fuel cell 1; a local current sensor 41 detecting a local current flowing in a local portion of a unit cell 10 to be a diagnosis target; a voltage sensor 42 detecting a voltage of the fuel cell 1; an impedance measurement part 432 measuring a first impedance ZHcorresponding to the AC signal in a high frequency domain, and a second impedance ZLcorresponding to the AC signal in a low frequency domain on the basis of detection values of the local current sensor 41 and the voltage sensor 42; a correction value calculation part 433 calculating a correction value Zαexclusive of influences of a dry/wet state in the unit cell 10 from the second impedance ZLby using the first impedance ZH; and a diagnosis part 434 diagnosing a supply state of a reaction gas for the fuel cell 1 by using the correction value Zαcalculated by the correction value calculation part 433.

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