Fuel cell stack comprising a counterflowing cooling system...

H - Electricity – 01 – M

Patent

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Details

H01M 8/24 (2006.01) H01M 8/02 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2491866

Disclosed is a fuel cell stack comprising several superimposed polymer electrolyte membrane fuel cells (2). A bipolar plate (7) that is provided with longitudinal ducts (10) supplying hydrogen and transverse ducts which supply oxygen and are used for cooling is arranged between adjacent membrane-elctrode units (4, 5, 6). A current flowing in opposite directions through adjacent ducts of the same fuel cell (2) can be created within the air ducts (8) via collecting ducts (11) that are provided at the outflow end for every other cooling duct if the flow is fed to the stack from both sides, resulting in a very homogeneous temperature distribution within the cell (2) or stack (1).

La présente invention concerne une pile de cellules électrochimiques composée de plusieurs cellules électrochimiques (2) de structure polymère-électrolyte-membrane, disposées les unes sur les autres. Une plaque bipolaire (7) est respectivement logée entre des unités membrane-électrode adjacentes (4, 5, 6), chaque plaque bipolaire comportant des canaux longitudinaux (10) destinés à l'alimentation d'hydrogène et des canaux transversaux (8) destinés à l'alimentation d'oxygène et au refroidissement. Des canaux collecteurs (11), prévus sur le côté d'écoulement pour un canal de refroidissement sur deux, permettent de produire un flux dans les canaux d'air (8) lorsque la pile est traversée bilatéralement par le fluide de refroidissement, des canaux adjacents de la même cellule électrochimique (2) étant alors respectivement traversés par des courants de sens opposés. Ainsi, il est possible de créer une répartition très homogène de la température à l'intérieur de la cellule (2) ou de la pile (1).

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