A fuel cell activation apparatus activates fuel cells. The fuel cells include, in order from one side, an anode layer, an electrolyte membrane, and a cathode layer. The anode layer and the cathode layer contain platinum as a catalyst. The fuel cell activation apparatus includes an anode-side gas supply device, a cathode-side gas supply device, and a potential scanning circuit. The fuel cell activation apparatus activates the fuel cells by supplying a fuel gas to the anode layer by the anode-side gas supply device, supplying a low oxygen gas to the cathode layer by the cathode-side gas supply device, and controlling a cathode potential by the potential scanning circuit.

To provide a fuel cell system configured to appropriately measure the AC impedance of a fuel cell. A fuel cell system wherein a controller controls ON and OFF of switches of n phases; wherein the controller monitors current values of coils; the controller operates the switches of the n phases at different phases; wherein the controller operates duty ratios of the switches of the n phases with periodically increasing and decreasing them, and the controller measures an AC impedance of a fuel cell from a current waveform of and a voltage waveform of the fuel cell; and wherein, when the controller determines that a predetermined condition 1 is met, the controller makes amplitudes which increase and decrease the duty ratios large compared to other operating conditions.

A power generation system includes a power source that is configured to communicate with at least one of a downstream load or a downstream device by changing a voltage on a power bus between the power source and the at least one of the downstream load or the downstream device, while power source provides power on the power bus to the at least one of the downstream load or the downstream device.

An apparatus for converting power of a fuel cell for power generation to remove an open voltage of the fuel cell when a failure occurs during power generation of the fuel cell and a method thereof are provided. A power converter converts and supplies power generated by the fuel cell to a system or load. A controller detects a failure occurring in the fuel cell, the power converter, or the system or load, while the fuel cell is driven, and reduces an open circuit voltage (OCV) of the fuel cell by a dummy resistor connected with an output terminal of the fuel cell, when the failure occurs in the fuel cell, the power converter, or the system or load. The apparatus removes an OCV of a fuel cell stack to prevent performance and life of the fuel cell from being reduced.

An apparatus for controlling a vehicle is introduced. The apparatus may comprise a fuel cell, a sensor, an air compressor, and a processor configured to drive, based on an input indicating that the vehicle's ignition is on, the air compressor at a specified revolutions per minute (RPM) and control an air flow to prevent from entering the fuel cell, determine, based on sensor information from the sensor, whether a flow of air, driven by the air compressor, entering the vehicle from an outside is within a specified flow range, wherein the specified flow range may comprise a target flow, and change, based on the flow of the air entering the vehicle being outside the specified flow range, a parameter to adjust an oscillation of an output of the vehicle, wherein the output of the vehicle corresponds to the specified RPM.

A flow battery system is disclosed.

A system for monitoring a voltage condition of a fuel cell (FC) stack includes at least two FCs operating together in series. At least one light-emitting diode (LED) is in electrical communication with the at least two FCs. At least one sensor is in visual communication with the at least one LED to receive a visual emission from the at least one LED. At least one processor is in communication with the at least one sensor. The at least one processor has a computer-readable memory and a power supply. A brightness of the at least one LED is determined by a voltage condition of the at least two FCs.

A flow battery bubble detection system includes a flow battery having a cathode and an anode circulation flow path, an electrochemical cell and an exchange membrane. A portion of the cathode or the anode circulation flow path is formed as a light-transmissible flow path section. A detection device includes a light source, a receiving unit and a detection unit. The light source and receiving unit are connected to the detection unit and respectively arranged on opposite sides of the light-transmissible flow path section so that a detection light of a single wavelength emitted from the light source travels through the light-transmissible flow path section and is received by the receiving unit. The receiving unit outputs a detection voltage signal to the detection unit corresponding to the received detection light. The detection unit detects bubbles in the electrolyte flowing through the light-transmissible flow path section based on the detection voltage signal.

A power source assembly includes a plurality of strings electrically connectable to a load. Each of the plurality of strings includes a fuel cell module and a DC/DC converter electrically connected to the fuel cell module. Each of the plurality of strings is arranged in parallel to each other of the plurality of strings.

An air supply system for fuel cells includes a fuel cell, an air supply line connected to a cathode of the fuel cells to supply external air to the cathode of the fuel cell, an air pressure sensor provided on the air supply line, and configured to measure a pressure in the air supply line, a determiner configured to determine whether correction for the air pressure is necessary, and a controller connected to the determiner and configured to perform the correction for the air pressure sensor by performing voltage control of the fuel cell, upon determining that the correction for the air pressure sensor is necessary.