Abstract: A process for supplying a fuel cell with reactive species, including a stack of electrochemical cells divided into N different groups, wherein a plurality of steps of selectively supplying the N groups of cells with reactive species are carried out, following each of the supply steps, a step of purging the N groups of cells is carried out.

Abstract: A process for supplying a fuel cell with reactive species, including a stack of electrochemical cells divided into N different groups, wherein a plurality of steps of selectively supplying the N groups of cells with reactive species are carried out, following each of the supply steps, a step of purging the N groups of cells is carried out.

Abstract: An electrochemical generator comprises a stack of cells in series. To control the voltage across the terminals, controlling means comprise, for each cell, a first reactive passive component, the impedance varying depending on the DC voltage across its terminals, being biased by the voltage delivered by the cell, and a second reactive or resonant passive component forming, with the first reactive passive component, a series or parallel resonant circuit having a preset nominal resonant frequency for a nominal biasing voltage delivered by the cell. Using a variable frequency signal generator to supply the resonant circuits allows a detection circuit to detect resonant peak(s) across the terminals. The divergence between the resonant frequency corresponding to a detected peak and the nominal resonant frequency indicates the state of the associated cell. The frequency differences directly, for their part, provide information on the uniformity of the cells with respect to each other.

Abstract: Electrochemical system comprising a fuel cell comprising a stack (2) of electrochemical cells electrically connected to one another by bipolar plates (A, B, C) interposed between two successive electrochemical cells of the stack, where said stack (2) is positioned between two terminal plates (4), where said stack extends in a longitudinal axis (Z), where said electrochemical system comprises means for supplying the cells with reactive fluids, means of circulation of a heat-transfer fluid through the stack, and at least one induction heating system comprising a pair of inductors facing a lateral face of the stack, where the currents flowing in the two inductors flow in opposite directions.

Abstract: An electrochemical generator comprises a stack of cells in series. To control the voltage across the terminals, controlling means comprise, for each cell, a first reactive passive component, the impedance varying depending on the DC voltage across its terminals, being biased by the voltage delivered by the cell, and a second reactive or resonant passive component forming, with the first reactive passive component, a series or parallel resonant circuit having a preset nominal resonant frequency for a nominal biasing voltage delivered by the cell. Using a variable frequency signal generator to supply the resonant circuits allows a detection circuit to detect resonant peak(s) across the terminals. The divergence between the resonant frequency corresponding to a detected peak and the nominal resonant frequency indicates the state of the associated cell. The frequency differences directly, for their part, provide information on the uniformity of the cells with respect to each other.