Abstract: The fuel cell system includes a water electrolysis device, a first gas-liquid separator, an oxygen tank, a fuel cell, a second gas-liquid separator, and a controller. When the level of water in the first gas-liquid separator becomes lower than a predetermined threshold value, the controller supplies oxygen gas having a pressure higher than the internal pressure of the first gas-liquid separator to the second gas-liquid separator and opens the first on-off valve.

Abstract: A fuel cell system including an exhaust merging unit at which a cathode exhaust fluid containing water discharged from a cathode of a fuel cell stack merges with an anode exhaust fluid containing water discharged from an anode of the fuel cell stack, wherein the exhaust merging unit includes a cathode exhaust outlet for discharging the cathode exhaust fluid, an anode exhaust outlet for discharging the anode exhaust fluid, and a partition separating the cathode exhaust outlet and the anode exhaust outlet on an upstream side of a merging section at which the cathode exhaust outlet and the anode exhaust outlet merge.

Abstract: A regenerative fuel cell system includes a supply mechanism for supplying gas generated by a pressurization apparatus to a fuel cell, and a control apparatus. The supply mechanism includes a flow regulating valve provided in a gas supply path, and a pressure sensor that detects pressure of the gas supplied to the gas supply path. When a pressurization-stop operation is started, the control apparatus adjusts the flow rate of the flow regulating valve to realize a target depressurization rate, and causes the fuel cell to generate power corresponding to the flow rate.

Abstract: A fuel cell system including an exhaust merging unit at which a cathode exhaust fluid containing water discharged from a cathode of a fuel cell stack merges with an anode exhaust fluid containing water discharged from an anode of the fuel cell stack, wherein the exhaust merging unit includes a cathode exhaust outlet for discharging the cathode exhaust fluid, an anode exhaust outlet for discharging the anode exhaust fluid, and a partition separating the cathode exhaust outlet and the anode exhaust outlet on an upstream side of a merging section at which the cathode exhaust outlet and the anode exhaust outlet merge.

Abstract: In a water electrolysis system and a control method therefor, when a depressurizing process is performed, pressure reducing valves for high pressure reduce the pressure of a high pressure hydrogen. A first pressure detecting sensor detects, as a first pressure, a pressure of the high pressure hydrogen on a more upstream side than the pressure reducing valves for high pressure. A second pressure detecting sensor detects, as a second pressure, a pressure of the high pressure hydrogen on a more downstream side than a first pressure reducing valve of the pressure reducing valves for high pressure. Based on the first pressure or the second pressure, a controller controls a degree of opening of a depressurization control valve.

Abstract: In a water electrolysis system and a control method therefor, when a depressurizing process is performed, pressure reducing valves for high pressure reduce the pressure of a high pressure hydrogen. A first pressure detecting sensor detects, as a first pressure, a pressure of the high pressure hydrogen on a more upstream side than the pressure reducing valves for high pressure. A second pressure detecting sensor detects, as a second pressure, a pressure of the high pressure hydrogen on a more downstream side than a first pressure reducing valve of the pressure reducing valves for high pressure. Based on the first pressure or the second pressure, a controller controls a degree of opening of a depressurization control valve.