State detection device and method for fuel cell

A state detection method for a fuel cell for generating power upon receiving a supply of anode gas and cathode gas, comprising:

• a step of acquiring a high frequency impedance based on a frequency selected from a high frequency band and a low frequency impedance based on a frequency selected from a low frequency band, the high frequency band including a frequency band which shows responsiveness at least to a state quantity of an anode electrode, the low frequency band including a frequency band which shows responsiveness at least to a state quantity of a cathode electrode;
• and
• a step of estimating each of the state quantity of the anode electrode and the state quantity of the cathode electrode serving as internal states of the fuel cell by combining the acquired high frequency impedance and low frequency impedance.

A state detection device for a fuel cell for generating power upon receiving a supply of anode gas and cathode gas, comprising:

• an impedance acquisition unit configured to acquire a high frequency impedance based on a frequency selected from a high frequency band and a low frequency impedance based on a frequency selected from a low frequency band, the high frequency band including a frequency band which shows responsiveness at least to a state quantity of an anode electrode, the low frequency band including a frequency band which shows responsiveness at least to a state quantity of a cathode electrode;
• and
• an internal state quantity estimation unit configured to estimate each of the state quantity of the anode electrode and the state quantity of the cathode electrode by combining the acquired high frequency impedance and low frequency impedance, the state quantity of the anode electrode and the state quantity of the cathode electrode serving as internal states of the fuel cell.