Patent ID: 8765315

Claim:
A fuel cell system comprising: a fuel cell configured to generate electric power by making a fuel gas supplied to a fuel electrode and an oxidant gas supplied to an oxidant electrode electrochemically react with each other; a fuel gas supply unit configured to supply the fuel electrode with the fuel gas through a fuel gas supply passage; a first open/close device provided in the fuel gas supply passage and configured to change an open/closed state of the fuel gas supply passage; a second open/close device provided in the fuel gas supply passage at a position downstream of the first open/close device and configured to change an open/closed state of the fuel gas supply passage; a bypass passage, a first end of which is connected to the fuel gas supply passage at a position between the first open/close device and the second open/close device, and a second end of which is connected to the fuel gas supply passage at a position between the second open/close device and the fuel cell; a flow rate limitation device provided in the bypass passage and configured to limit a flow rate of the gas flowing through the bypass passage; and a controller configured to execute, in shutdown of a system, a shutdown process in which gas consumption control is such that the oxidant gas in the oxidant electrode is consumed in a state where supply of the oxidant gas to the oxidant electrode of the fuel cell is shut off while the fuel gas is supplied to the fuel electrode of the fuel cell, and to set the first open/close device and the second open/close device in a closed state after termination of the gas consumption control, to execute control such that the fuel gas held between the first open/close device and the second open/close device is supplied to the fuel electrode through the bypass passage after termination of the shutdown process, and to execute control such that supply of fuel gas to the fuel electrode is terminated after a lapse of a predetermined period since the termination of the shutdown process.