| 摘要 |
PROBLEM TO BE SOLVED: To provide a micro short circuit detecting method for a fuel cell which can detect precisely micro short circuit of a cell without applying large current to the cell. SOLUTION: The micro short-circuit detecting method comprises a process in which fuel gas is applied to an anode, as a cathode side is controlled to be more than 100 mV, either oxidizing gas in the cell is consumed while oxidizing gas is blocked when electrical load 34 is added to a cell 30, or inactive gas is supplied when electrical load is not added to the cell, a process of calculating a slope (x) of current change/voltage change between constant potential conditions by connecting an external measurement circuit 31 to the anode and cathode terminals of the cell 30, making electrical potentials of the cathode terminal changed to two or more points in a range from 120 mV to 1230 mV against the anode terminal and measuring the current carried by the external measurement circuit 31 at each constant potential condition, and a process of judging generation of micro short circuits in the cell 30 when the slope (x) is more than the given value. |
