Hydrogen management system for metal/air fuel cell

H - Electricity – 01 – M

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H01M 12/04 (2006.01) H01M 6/50 (2006.01) H01M 12/06 (2006.01)

Patent

CA 2206952

A process for controlling the hydrogen that evolves as a parasitic by-product during the operation of a metal/air fuel cell (10) which comprises feeding into a catalytic recombiner (20) a gaseous stream containing hydrogen being discharged from the metal/air cell together with an amount of oxygen (18) sufficient to convert the hydrogen to water, said oxygen gas concentration being monitored by an electronic sensor (16) and adjusted by a valve (19) to maintain a concentration in the stream entering the recombiner in the range of 1.5 to 2.5 % by volume. The process is of particular value in closed system aluminum/air fuel cells in which small amount of hydrogen must be removed, e.g., the sealed hull of an underwater vehicle.

L'invention concerne un procédé pour réguler l'hydrogène qui se dégage sous forme de sous-produit parasite lors du fonctionnement d'une cellule électrochimique métal/air (10). Ce procédé consiste à introduire dans un recombinateur catalytique (20) un courant gazeux contenant l'hydrogène dégagé par la cellule métal/air conjointement avec une quantité d'oxygène (18) suffisante pour convertir l'hydrogène en eau, ladite concentration d'oxygène gazeux étant contrôlée par un capteur électronique (16) et réglée par une vanne (19) en vue de maintenir dans la plage de 1,5 à 2,5 % en volume cette concentration dans le courant entrant dans le recombinateur. Ce procédé est particulièrement avantageux dans des cellules électrochimiques aluminium/air en circuit fermé, dans lesquelles de faibles quantités d'hydrogène doivent être éliminées, par exemple la coque étanche d'un engin sous-marin.

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