Method for checking the seal of a stack of fuel cells

H - Electricity – 01 – M

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H01M 8/04 (2006.01) G01M 3/22 (2006.01)

Patent

CA 2746093

A stack (10) of fuel cells (11) is to be tested for tightness of the fuel cell membranes. For this purpose, a tracer gas is introduced into the fuel feed channel (15) of the stack (10). The fuel discharge channel (16) is either open or it is closed. A carrier gas is fed to the feed air channel. (17) and led through the exhaust air channel (18) to a gas sensor (28) where a determination is made whether the carrier gas contains amounts of tracer gas. A defective fuel cell (11) can be located by introducing a lance comprising a sniffing probe into the corresponding channel (18) and determining the position of the probe.

L'étanchéité des membranes des cellules à combustible d'une pile (10) de cellules à combustible (11) doit être contrôlée. Dans ce but, on introduit un gaz de trace dans le canal (15) d'amenée de combustible de la pile (10). Le canal (16) d'évacuation de combustible reste ouvert ou est fermé. Un gaz porteur est amené dans le canal (17) d'amenée d'air et est amené par le canal (18) d'évacuation d'air à un détecteur de gaz (28) où l'on vérifie si le gaz porteur contient des teneurs en gaz de trace. La localisation d'une cellule à combustible (11) défectueuse peut s'effectuer en insérant une lance dotée d'une sonde à reniflard dans le canal (18) correspondant et en déterminant la position de la sonde.

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