Method for identifying a gas leak, and a fuel cell system

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01)

Patent

CA 2273018

In the case of the present method for identifying a gas leak (32) between the anode and cathode gas areas (4 and 6, respectively) of a PEM fuel cell (2), a cell voltage is detected, and the anode and cathode gas areas (4 and 6, respectively) are purged with nitrogen (N2) in a first time period, the cathode gas area (6) is filled with oxygen (O2) and the anode gas area (4) is filled with hydrogen (H2) in a second time period, and the drop in the cell voltage below a limit value as a function of time is then measured and evaluated. This measure ensures reliable identification of the gas leak (32).

Selon ce procédé de reconnaissance de fuites de gaz (32) entre la chambre à gaz anodique et la chambre à gaz cathodique (4 et 6) d'une cellule électrochimique (2) à électrolyte polymère membranaire, la tension de la cellule est saisie et pendant une première période les chambres à gaz anodique et cathodique (4 et 6) sont rincées à l'azote (N2). Pendant une deuxième période, la chambre à gaz cathodique (6) est remplie d'oxygène (O2) et la chambre à gaz anodique (4) est remplie d'hydrogène (H2), puis la chute de tension de la cellule en fonction du temps jusqu'à une valeur inférieure à un seuil est mesurée et évaluée. Cette mesure permet de reconnaître fiablement une fuite de gaz (32).

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