A method for determining if there is a gas leak in an anode volume of a fuel cell stack in a fuel cell system. The method includes determining a total amount of gas loss in the anode volume of the fuel cell stack during a predetermined period of time, and monitoring losses of the gas from the anode volume during the predetermined period of time, such as reaction losses, crossover losses and overboard losses. The method also includes subtracting the losses of the gas from the total amount of gas loss to get an anode leak loss and comparing the anode leak loss to a predetermined threshold to identify a hydrogen gas leak.

Provided are a method and an apparatus controlling a water flooding failure in a fuel cell dual-stack system. The method includes: acquiring a hydrogen pressure drop reference value of the stack system in each normal working condition to obtain a control value; collecting a current pressure drop at a hydrogen side, and determining whether the current pressure drop at the hydrogen side is higher than the control value corresponding to a current normal working condition; determining a faulted stack according to voltages or currents of the first stack and the second stack if the current pressure drop at the hydrogen side is higher than the control value corresponding to the current normal working condition; reducing an opening degree of a flow regulating valve of the faulted stack, and increasing an opening degree of a flow regulating valve of the other stack.

A fuel cell system installed in a mobile body comprises; a fuel cell; a gas supply flow path; an injection device provided on the gas supply flow path; a pressure regulating valve configured to be provided more on an upstream side than the injection device on the gas supply flow path, and to autonomously perform an opening/closing operation in accordance with a difference between pressure between the pressure regulating valve and the injection device on the gas supply flow path and pressure on an upstream side of the pressure regulating valve; and a control unit configured to control injection of the reaction gas by the injection device. The control unit calculates an injection interval of the injection device based on an upper limit operation count of the pressure regulating valve set in advance with respect to a predetermined traveling distance of the mobile body.

A device keeps an electrochemical cell under current and at operating temperature during an X-ray beam diffraction analysis of a first electrode, the cell comprising a solid electrolyte interposed between the electrodes. The device comprises: first and second interconnectors having contact faces contacting the electrodes, which allow a gas flow and exchange between the interconnectors and the electrodes. The contact face of the first interconnector allows an X-ray beam to pass to the first electrode. A thermal and atmospheric containment chamber has an inner cavity housing a stack formed from the cell between the interconnectors and a cover closing the cavity, provided with a window allowing X-rays to pass through, the first interconnector being intended to be arranged facing the cover. The contact face of each interconnector is a slotted element; slotted portions of the slotted element are uniformly arranged and form 30% to 80% of the element's surface area.

Systems and methods for operating an electric energy storage device are described. The systems and methods may reduce a voltage potential between a ground reference and terminals of an electric energy storage device. By lowering the voltage potential, a possibility of unintentionally discharging the electrical energy storage device to ground may be reduced.

Systems and methods for operating an electric energy storage device are described. The systems and methods may reduce a voltage potential between a ground reference and terminals of an electric energy storage device. By lowering the voltage potential, a possibility of unintentionally discharging the electrical energy storage device to ground may be reduced.

The invention relates to a method for setting an operating strategy for a fuel cell system (2) of a power generation device (1), in particular in the form of a vehicle, depending on an operating mode of the power generation device (1), having the steps of: a determination unit (3) determining at least one current operating parameter (P1) of the power generation device (1), the determination unit (3) determining at least one cumulative and/or predictive operating parameter (P2, P3, P4) of the power generation device (1), and a setting device (8) setting the operating strategy for the fuel cell system (2) on the basis of the at least one current operating parameter (P1) and the at least one cumulative and/or predictive operating parameter (P2, P3, P4) of the power generation device (1). The invention furthermore relates to a corresponding circuit arrangement (10), to a computer program (20) and to a storage means with a computer program (20) stored thereon.

The circulation rates of the electrolyte solutions in a flow battery can impact operating performance. Adjusting the circulation rates can allow improved performance to be realized. Flow battery systems having adjustable circulation rates can include a first half-cell containing a first electrolyte solution, a second half-cell containing a second electrolyte solution, at least one pump configured to circulate the first electrolyte solution and the second electrolyte solution at adjustable circulation rates through at least one half-cell in response to a value of P.sub.exit/I or I/P.sub.enter, and at least one sensor configured to measure net electrical power entering or exiting the flow battery system, and an amount of electrical current passing through the whole cell. I is the electrical power passing through the whole cell. P.sub.exit is net electrical power exiting the system in a discharging mode, and P.sub.enter is net electrical power entering the system in a charging mode.

An artificial intelligent fuel cell system according to an exemplary embodiment of the present invention may include: a fuel cell stack in which a plurality of unit cells is combined for generating electric energy with an electrochemical reaction; a sensor unit which measures in real time data about each of the unit cells forming the fuel cell stack, temperature, pressure, humidity, and flow rates of reaction gases, and cooling water, and current and voltage data during an operation of a fuel cell; an artificial intelligent unit which collects the data measured by the sensor unit with a predetermined time interval, generates a model for predicting and controlling performance of the fuel cell through the learning and analysis of the collected data, compares the generated model with the data measured in real time and diagnoses a state of the fuel cell stack, and generates a control signal for changing an operation condition of the fuel cell stack; and a control unit which changes the operation condition of the fuel cell stack according to the generated control signal.

Methods, systems, and techniques are provided for acquiring fuel cell polarization data, obtaining fuel cell polarization parameters from the fuel cell polarization data, and validating the reliability of the obtained data and parameters. In some aspects methods for acquiring and parameterizing proton exchange membrane fuel cell polarization data include measuring at least one current-voltage point for an operating fuel cell, and determining at least one polarization parameter of the fuel cell by evaluating a closed form solution using the at least one current-voltage point.