The invention relates to a method for operating a fuel cell system, in particular a PEM fuel cell system, in which an QI anode gas is supplied to an anode (1) of a fuel cell via a supply path (2), and is fed back via a recirculation path (3) connected to the anode (1), wherein hydrogen is used as the anode gas. According to the invention, during the start up of the fuel cell system, the anode gas is supplied to a drying device (4), in particular an adsorber, via at least one normally open valve (8, 9, 10), and water is extracted from the anode gas using the drying device (4). The invention also relates to a fuel cell system, in particular a PEM fuel cell system, which is suitable for carrying out the method.

The invention relates to a method for operating a fuel cell system, in particular a PEM fuel cell system, in which an QI anode gas is supplied to an anode (1) of a fuel cell via a supply path (2), and is fed back via a recirculation path (3) connected to the anode (1), wherein hydrogen is used as the anode gas. According to the invention, during the start up of the fuel cell system, the anode gas is supplied to a drying device (4), in particular an adsorber, via at least one normally open valve (8, 9, 10), and water is extracted from the anode gas using the drying device (4). The invention also relates to a fuel cell system, in particular a PEM fuel cell system, which is suitable for carrying out the method.

Methods and systems for an electric vehicle (EV) propulsion are provided. A method for operating an EV propulsion system is provided, in one example, that includes, while a traction battery assembly generates electric power, initiating start-up of a hydrogen fuel cell assembly based on a first battery state of charge (SOC) threshold and a first hydrogen fuel storage threshold to transition into a hybrid mode of operation. In the propulsion system, the traction battery assembly includes one or more traction batteries that are electrically coupled to one or more hydrogen fuel cells in the hydrogen fuel cell assembly via a distribution assembly, where the distribution assembly is electrically coupled to a traction motor.

Methods and systems for an electric vehicle (EV) propulsion are provided. A method for operating an EV propulsion system is provided, in one example, that includes, while a traction battery assembly generates electric power, initiating start-up of a hydrogen fuel cell assembly based on a first battery state of charge (SOC) threshold and a first hydrogen fuel storage threshold to transition into a hybrid mode of operation. In the propulsion system, the traction battery assembly includes one or more traction batteries that are electrically coupled to one or more hydrogen fuel cells in the hydrogen fuel cell assembly via a distribution assembly, where the distribution assembly is electrically coupled to a traction motor.

The present application discloses a car power supply system and a solid oxide fuel cell vehicle. The car power supply system specifically comprises a first battery, a vehicle control unit (VCU), a lithium battery management system, a solid oxide fuel cell control unit, a second battery, a first relay and a second relay. If a solid oxide fuel cell controlled by the solid oxide fuel cell control unit provided by the present application cannot stop working within a short time, the first relay restores the first battery to power the VCU and the lithium battery management system after a start switch stops power supply by the first battery, so that the solid oxide fuel cell control unit is powered by the second battery to make the cell work normally and realize power off, thereby preventing the problem that the solid oxide fuel cell cannot work due to rapid power failure of the vehicle.

The present application discloses a car power supply system and a solid oxide fuel cell vehicle. The car power supply system specifically comprises a first battery, a vehicle control unit (VCU), a lithium battery management system, a solid oxide fuel cell control unit, a second battery, a first relay and a second relay. If a solid oxide fuel cell controlled by the solid oxide fuel cell control unit provided by the present application cannot stop working within a short time, the first relay restores the first battery to power the VCU and the lithium battery management system after a start switch stops power supply by the first battery, so that the solid oxide fuel cell control unit is powered by the second battery to make the cell work normally and realize power off, thereby preventing the problem that the solid oxide fuel cell cannot work due to rapid power failure of the vehicle.

A control method includes acquiring the operation stop request of the fuel cell system, acquiring a next vehicle operation start timing, and calculating a first energy cost and a second energy cost at a predetermined timing after acquiring the operation stop request and the next vehicle operation start timing. The first energy cost is an energy cost required from the predetermined timing to completion of warming up of the fuel cell when a warm-up control is executed using the heater in accordance with the next vehicle operation start timing after the stop control is executed. The second energy cost is an energy cost required when an operation of the fuel cell is continued so as to maintain a temperature of the fuel cell at a warm-up temperature from the predetermined timing to the next vehicle operation start timing. The control method includes continuing the operation of the fuel cell such that the temperature of the fuel cell is maintained at the warm-up temperature while the first energy cost is larger than the second energy cost after the operation stop request is acquired.

A control method includes acquiring the operation stop request of the fuel cell system, acquiring a next vehicle operation start timing, and calculating a first energy cost and a second energy cost at a predetermined timing after acquiring the operation stop request and the next vehicle operation start timing. The first energy cost is an energy cost required from the predetermined timing to completion of warming up of the fuel cell when a warm-up control is executed using the heater in accordance with the next vehicle operation start timing after the stop control is executed. The second energy cost is an energy cost required when an operation of the fuel cell is continued so as to maintain a temperature of the fuel cell at a warm-up temperature from the predetermined timing to the next vehicle operation start timing. The control method includes continuing the operation of the fuel cell such that the temperature of the fuel cell is maintained at the warm-up temperature while the first energy cost is larger than the second energy cost after the operation stop request is acquired.

A system and method for controlling a discharge of residual water remaining in a fuel cell stack after an operation of a fuel cell is ended is provided. The method includes determining whether a preset temperature condition is satisfied, determining whether a preset time condition is satisfied when the temperature condition is satisfied, and discharging residual water in a fuel cell stack while a vehicle travels when the temperature condition and the time condition are satisfied.

A system and method for controlling a discharge of residual water remaining in a fuel cell stack after an operation of a fuel cell is ended is provided. The method includes determining whether a preset temperature condition is satisfied, determining whether a preset time condition is satisfied when the temperature condition is satisfied, and discharging residual water in a fuel cell stack while a vehicle travels when the temperature condition and the time condition are satisfied.