Patent ID: 8415065
Filing Date: 2013-04-09
Classification: H01M,Y02E

Abstract:
1. A fuel cell system characterized by comprising: a fuel cell that is supplied with a fuel gas and an oxidizing gas to generate an electric power; a DC/DC converter that is electrically connected to the fuel cell; and a control unit that controls supply of the fuel gas and the oxidizing gas to the fuel cell and issues a voltage command to and drives the DC/DC converter to execute a high potential avoidance control to restrain an output voltage of the fuel cell from exceeding a high potential avoidance voltage corresponding to the voltage command which is lower than an open circuit voltage, wherein the control unit continues to drive the DC/DC converter to execute the high potential avoidance control for a first prescribed time period after the supply of the fuel gas and the oxidizing gas to the fuel cell is stopped in accordance with a system operation stop command; the control unit performs control of lowering the voltage command for the DC/DC converter from a first value corresponding to the high potential avoidance voltage to a second value while performing the high potential avoidance control after the system operation stop command is input to the control unit; and the control unit increases the voltage command for the DC/DC converter to the first value after reducing the voltage command for the DC/DC converter from the first value to the second value.