FUEL CELL SYSTEM AND CONTROL METHOD THEREFOR

摘要

A fuel cell system and a control method therefor are provided. The fuel cell system (100) includes: a fuel cell (10) formed of a plurality of stacked power generating elements (11); a cell voltage measuring unit (91) detecting negative voltage in any one of the power generating elements (11); a control unit (20) controlling electric power output from the fuel cell (10); and an accumulated current value measuring unit (21) measuring an accumulated current value obtained by time integration of current output from the fuel cell. The control unit (20) prestores a correlation between accumulated current values and current densities that are allowable for the fuel cell (10) in a period during which negative voltage is generated. When negative voltage has been detected, the control unit (20) executes output restricting process of restricting electric power output from the fuel cell (10) so as to fall within an operation allowable range defined by the accumulated current values and current densities of the correlation.