Passive electrode blanketing in a fuel cell

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01)

Patent

CA 2527286

When a conventional fuel cell module is shutdown the conditions within the fuel cell stack change. The conditions change because elements that support and regulate the operation of the fuel cell stack switch to their respective shutdown states. For example, the input and output valves are closed, which cuts off the supply inflows and exhaust outflows. Moreover, when an element such as a flow control device switches to a shutdown state internal conditions, such as for example, the pressure within the anode electrodes change. When the internal conditions of the fuel cell stack change the reactants (e.g. hydrogen and oxygen) remaining in the fuel cell stack and the feed lines (between the fuel cell stack and the closed valves) are substantially consumed in combustion reactions as opposed to being consumed in electrochemical reactions yielding a useful form of energy.

Lorsqu'un module de piles à combustible classique est éteint, les conditions internes changent. Ces conditions changent car les éléments qui soutiennent et régulent le fonctionnement du module de piles à combustible passent chacun à leur état d'arrêt respectif. Par exemple, la fermeture des valves d'entrée et de sortie suspend les flux entrants d'alimentation et les flux sortants d'échappement. De plus, lorsqu'un élément tel que le dispositif de commande d'écoulement passe à des conditions internes d'état d'arrêt, par exemple, la pression des anodes change. Et lorsque les conditions internes du module de piles à combustible changent, les réactifs (tels que l'hydrogène et l'oxygène) restant dans le module de piles à combustible et les conduites d'alimentation (entre le module de piles à combustible et les valves fermées) sont sensiblement utilisés dans les réactions à combustion, par opposition à leur utilisation dans des réactions électrochimiques qui génèrent une forme d'énergie utilisable.

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