A fuel cell system for generating power by supplying anode gas and cathode gas to a fuel cell, comprising a compressor for supplying the cathode gas to the fuel cell, a pulsating operation unit causing a pressure of the anode gas to pulsate based on an operation state of the fuel cell system, a first target pressure setting unit setting a first target pressure of the cathode gas based on a request of the fuel cell, a second target pressure setting unit setting a second target pressure of the cathode gas for keeping a differential pressure in the fuel cell to be within a permissible differential pressure range according to the pressure of the anode gas in the fuel cell, and a compressor control unit controlling the compressor based on the first target pressure and the second target pressure. The second target pressure setting unit sets the second target pressure based on an upper limit target pressure in pulsation on the pulsation of the pressure of the anode gas.

A control valve for controlling the exhausting of a purge gas from a fuel cell assembly, comprising a valve body having a valve member therein moveable between a first position and a second position, an inlet port for receiving a purge gas from the fuel cell assembly and an outlet port for providing an outlet for the purge gas, the valve member configured to, in the first position, prevent purge gas from flowing between the inlet port and the outlet port and, in the second position, allow the flow of purge gas between the inlet port and the outlet port, the valve body including a drain port adapted and arranged in the valve body to allow liquid to drain out of the valve body, the drain port configured to close when the valve member is in the second position.

A fuel cell has a stack that includes a fuel electrode and air electrode on opposite sides of an electrolyte membrane. The fuel electrode includes first and second fuel ports communicative via a fuel flow path, and the air electrode includes first and second air ports communicative via an air flow path. The fuel cell also includes first and second fuel feeders communicative with the first and second fuel ports, and first and second air feeders communicative with the first and second air ports. The fuel cell also includes a fuel switching unit between the first and second fuel feeders that switches a fuel supply direction between the first and second fuel feeders. The fuel cell further includes an air switching unit between the first and second air feeders that switches an air supply direction between the first and second air feeders.

A fuel cell system (100) includes a hydrogen supply valve (33) that controls a supply of the anode gas into an anode system, a purge valve (36) that discharges an off-gas from the anode system, a pressure detecting unit (34) configured to measure a pressure inside the anode system, and a purge flow rate estimating unit (4) configured to estimate a purge flow rate of the off-gas discharged from the anode system through the purge valve (36) based on a pressure decrease in a purge valve open state and a pressure decrease in a purge valve close state when an anode gas supply into the anode system stops.

The present disclosure provides a system and a method for purging the condensate water and hydrogen of a fuel cell stack, which may allow the condensate water and hydrogen discharged from a stack to be directly bypassed to an exhaust line of a humidifier rather than a shell side of the humidifier to be purged to the atmosphere according to the operation state and operation condition of the stack, thereby solving a problem in that an inverse voltage is generated upon cold operation of a fuel cell system, a flooding phenomenon occurs in the stack, or the like to improve the operation stability of the stack and the operation efficiency of the fuel cell system.

The present disclosure generally relates to systems and methods for purging water or gas from a fuel cell system. The fuel cell system may include a multi-phase valve system and/or a separate valve system. The opening and closing of the valve systems for removing gas and water is controlled by a controller,

The invention relates to a fuel cell system (100) comprising a fuel cell stack (10) comprising anode chambers (11) and cathode chambers (12), an anode supply (20) comprising an anode supply path (21) for supplying an anode operating gas to the anode chambers (11), and an anode exhaust path (22) for discharging an anode exhaust gas from the anode chambers (11), and a cathode supply (30) comprising a cathode supply path (31) for supplying a cathode operating gas to the cathode chambers (12) and a cathode exhaust path (32) for discharging a cathode exhaust gas from the cathode chambers (12), and comprising a negative-pressure generation means (40) for generating a negative pressure in the cathode chambers (12). It is provided that the negative-pressure generation means (40) is designed as an ejector which is connected to a compressor (33) arranged in the cathode supply path (31) on the pressure input side, and to the cathode chambers (12) of the fuel cell stack (10) on the suction side, in a fluid-conducting manner.

The present invention relates, amongst other things, to a flushing system (40) for flushing an energy source device (15) and/or an energy sink device (16) of an energy system (10), the flushing system comprising: a flushing device (41) having a storage chamber (45), which on the input side is fluidically connected to a first line portion (46), which is formed as a flushing line starting from the energy source device (15), and/or to a second line portion (47), which is formed as a flushing line starting from the energy sink device (16); a first monitoring device (50) for monitoring the state of the storage chamber (45), the first monitoring device (50) comprising at least one sensor device (50a) associated with the storage chamber (45) for monitoring the fill level of the storage chamber (45); and also optionally a compensation container device (54) fluidically connected to the storage chamber (45). In order to further advantageously modify the flushing system (40) by simple structural and economical measures so that the flushing system can be monitored in a safety-related manner, the flushing system (40) comprises a safety control device (53); the sensor device (50a) for monitoring the fill level of the storage chamber (45) is connected to the safety control device (53) via an interface (80, 81) associated with the storage chamber; and the flushing system (40) optionally has at least one further monitoring device (66, 70) for monitoring the state of the compensation container device (54) and/or for monitoring valve devices (48, 49, 57, 59) which is/are connected to the safety control device (53) via interfaces associated with the compensation container device and/or valve devices.

A fuel cell system includes: a fuel cell; an anode gas supply flow path for supplying an anode gas to the fuel cell; an anode gas discharge flow path for discharging an anode off gas from the fuel cell; an anode gas circulation flow path for connecting the anode gas supply flow path and the anode gas discharge flow path to each other; a circulation device provided on the anode gas circulation flow path and serving for supplying the anode off gas to the anode gas supply flow path; and a controller. When liquid water is residing in the circulation device, the controller controls a circulation flow rate of the circulation device to discharge the liquid water residing in the circulation device. The controller restricts an increasing rate of the circulation flow rate of the circulation device if it is decided that a quantity of the liquid water residing in the circulation device is equal to or more than a specified value.

A fuel cell vehicle is provided. The fuel cell vehicle includes a fuel cell including a cell stack configured such that a plurality of unit cells is stacked, a drive motor unit disposed below the fuel cell, a purge valve / drain valve assembly configured to discharge unreacted hydrogen and first condensate water flowing together out of the fuel cell, an air exhaust line configured to discharge unreacted oxygen and second condensate water flowing together out of the fuel cell, and a hydrogen exhaust line connecting the purge valve / drain valve assembly to the air exhaust line and disposed so as to avoid interference with the drive motor unit.