Method for detecting a gas leak in a pem fuel cell

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01)

Patent

CA 2487242

The invention relates to a method for detecting a gas leak between the anode gas region and the cathode gas region of a PEM fuel cell (2). According to the inventive method, a) the fuel cell (2) is charged with a direct current, and b) the temporal course of the electrical voltage on the fuel cell is measured (2). Using only a small amount of equipment, a leak test can be carried out on a fuel cell stack (1). Said test is highly sensitive even to extremely small leaks, but can also be used for large leaks, and indicates the exact position of defective fuel cells (2) within the fuel cell stack (1).

L'invention concerne un procédé permettant de détecter une fuite de gaz entre l'espace gaz anode et l'espace gaz cathode d'une cellule à combustible PEM (2). Ce procédé consiste : a) à charger la cellule à combustible (2) d'un courant continu ; b) à mesurer le déroulement temporel de la tension électrique au niveau de la cellule à combustible (2). Cela permet de réaliser un test de fuite, pour un faible coût de matériel, dans une pile de cellules à combustible (1). Ce test réagit de manière très sensible même en cas de microfuites tout en pouvant être utilisé pour des fuites importantes et indique la position exacte de cellules à combustible (2) défectueuses d'une pile de cellules à combustible (1).

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