The invention relates to a control device (10) for a fuel cell stack (14), the control device being set up to actuate the fuel cell stack (14) using a predetermined current (I.sub.V) and to measure the resulting voltage (U) and to compare this with a reference voltage (U.sub.R). The predetermined current (I.sub.V) depends on the reference voltage (U.sub.R) by means of a sum of at least two exponential functions whose argument in each case contains the reference voltage (U.sub.R). The control device (10) is designed to ascertain the reference voltage (U.sub.R) by approximately reversing the correlation between the predetermined current and the reference voltage (U.sub.R) using an iterative approximation algorithm.

The voltage measuring device is configured for measuring the voltage of a plurality of electrochemical cells (10) of an electrochemical reactor formed by a stack of separators (6) and membrane-electrode assemblies (8), each electrochemical cell (10) being formed by a membrane-electrode assembly (8) interposed between two separators (6), the voltage measuring device comprising a support (22) having a base (24) and a plurality of teeth (26) extending from the base (24) in a common direction of extension (D), each tooth (26) having a proximal end (26A) connected to the base (24) and a free distal end (26B) carrying an electrical contact (28) adapted to engage a separator, the support comprising teeth (26) the distal ends of which are offset from each other in the direction of extension (D).

Figure for the abstract: FIG.1

A fuel cell recovery control system and method are provided to supply hydrogen to the cathode of a fuel cell stack to remove an oxide film formed on a platinum surface of the cathode. The performance of the fuel cell stack is recovered in accordance with the oxide film removal. In addition, electric power generated during the performance recovery of the fuel cell stack is consumed in an inverter and, as such, overcharge of a battery is prevented.

The present disclosure relates to a method of recovering performance of a fuel cell stack in a fuel cell system of a vehicle. The method includes determining whether the fuel cell stack is in a state in which a stack performance recovery operation is possible based on information collected from the vehicle using a predetermined stack state determination criterion, determining whether the vehicle is in a state in which the stack performance recovery operation is possible based on operation information of a fuel cell system, and performing the stack performance recovery operation upon determining that the fuel cell stack is in the state in which the stack performance recovery operation is possible and that the vehicle is in the state in which the stack performance recovery operation is possible.

A fuel cell system includes a fuel cell stack, an oxidizing gas supply system, a cooling medium circulation pump, a stack temperature acquisition unit, and a control unit. After a first time point when a change in an acquisition temperature turns from downward to upward after the change in the acquisition temperature turns from upward to downward for the first time after the start of the warm-up operation processing, the control unit sets a decrease speed in cases of decreasing a rotational speed of the cooling medium circulation pump to a smaller value than a value set before the first time point.

The present disclosure generally relates to systems and methods for fuel cell regeneration after degradation.

A method of controlling a fuel cell includes collecting, by a control unit, environmental information and state information of a fuel cell stack; determining, by the control unit, a motor output offset value from the collected environmental information and the collected state information of the fuel cell stack; correcting, by the control unit, a default critical output corresponding to a current vehicle operating state based on the determined motor output offset value; determining, by the control unit, the stop or the restart of the fuel cell by comparing a motor output demand determined from current vehicle operating information with the corrected critical output; and controlling, by the control unit, an operating state of the fuel cell to become a state of the determined stop or restart.

A fuel cell stack formed by stacking a plurality of power generation cells together in a vehicle width direction and a voltage control unit including a voltage controller and a control case are mounted in a front box of a fuel cell vehicle. The control case is joined to a stack case in a manner that the control case is provided adjacent to the stack case in a direction perpendicular to the stacking direction of the plurality of power generation cells. A cell voltage detection unit is provided between the fuel cell stack and a voltage control unit.

System for recirculating hydrogen in a fuel cell including a tank having an inlet connectable to an outlet of the fuel cell and an outlet connectable to a line for feeding hydrogen to the fuel cell; the recirculation system includes a first check valve and a second check valve; the first check valve can be inserted between the outlet of the fuel cell and the inlet of the tank, for adjusting a flow from the fuel cell to the tank whilst the second check valve can be inserted between the outlet of the tank and the hydrogen feed line, for adjusting a flow of hydrogen from the tank to the feed line.

The present disclosure relates to a control method for a fuel cell. The control method includes: collecting, by a controller, state information of a fuel cell (FC) stack; determining, by the controller, a degradation state of the FC stack from the collected state information of the FC stack; correcting, by the controller, a basic threshold output corresponding to a present driving state of a vehicle on the basis of information of the determined degradation state of the FC stack; comparing, by the controller, a post-correction threshold output that is obtained by correcting the basic threshold output and a motor demand output, and determining, by the controller, stopping or restarting of a fuel cell; and controlling, by the controller, such that the determined stopping or restarting state of the fuel cell is achieved.