Electrochemical fuel cell stack with compression mechanism...

H - Electricity – 01 – M

Patent

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H01M 8/24 (2006.01)

Patent

CA 2198346

An electrochemical fuel cell stack has a first end plate, a second end plate, and fuel cell assemblies interposed therebetween. Each fuel cell assembly includes a membrane electrode assembly having at least one manifold header opening formed in the assembly for directing at least one of a fluid fuel stream, a fluid oxidant stream and a fluid coolant stream through the assembly. A tie rod extends within the opening and through each of the first and second end plates. Fastening means are disposed at opposite ends of the tie rod. Compressive means are interposed between at least one of the fastening means and at least one of the first and second end plates. In operation, the fastening means and the compressive means urge the first end plate toward the second end plate, thereby applying compressive force to the fuel cell assemblies.

Un empilage de cellules électrochimiques présente une première plaque terminale, une seconde plaque terminale, et des assemblages de cellules électrochimiques intercalés. Chaque assemblage comprend un ensemble électrode à membrane présentant au moins une ouverture de collecteur de tête ménagée dans l'ensemble afin d'acheminer un courant de combustible liquide et/ou un courant d'oxydant liquide et/ou un courant de réfrigérant liquide à travers l'assemblage. Une barre de raccordement s'étend dans l'ouverture et à travers les première et seconde plaques terminales. Des moyens de fixation sont disposés aux extrémités opposées de la barre de raccordement. Des moyens de compression sont intercalés entre au moins l'un des moyens de fixation et au moins l'une des plaques terminales. En cours de fonctionnement, les moyens de fixation et les moyens de compression sollicitent la première plaque terminale vers la seconde, appliquant ainsi une force de compression sur les assemblages de cellules électrochimiques.

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