Sealed joint structure for electrochemical device

H - Electricity – 01 – M

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H01M 2/08 (2006.01)

Patent

CA 2627863

Several members make up a joint in a high-temperature electrochemical device, wherein the various members perform different functions. The joint is useful for joining multiple cells (generally tubular modules) of an electrochemical device to produce a multi-cell segment-in-series stack for a solid oxide fuel cell, for instance. The joint includes sections that bond the joining members to each other; one or more seal sections that provide gas-tightness, and sections providing electrical connection and/or electrical insulation between the various joining members. A suitable joint configuration for an electrochemical device has a metal joint housing, a first porous electrode, a second porous electrode, separated from the first porous electrode by a solid electrolyte, and an insulating member disposed between the metal joint housing and the electrolyte and second electrode. One or more brazes structurally and electrically connects the first electrode to the metal joint housing and forms a gas tight seal between the first electrode and the second electrode.

Plusieurs éléments effectuant des fonctions différentes constituent un joint utilisé dans un dispositif électrochimique fonctionnant à haute température. Ce joint est utile pour assembler de multiples cellules (généralement des modules tubulaires) d'un dispositif électrochimique afin de produire un empilement de segments en série, multicellulaire, pour, par exemple, une pile à combustible à oxyde solide. Ce joint comprend des sections qui lient les éléments d'assemblage les uns aux autres; une ou plusieurs sections de scellement qui assurent l'étanchéité au gaz, et des sections assurant la connexion électrique et/ou l'isolation électrique entre les divers éléments d'assemblage. Une structure de joint adapté à un dispositif électromécanique comporte un logement de joint métallique, une première électrode poreuse, une seconde électrode poreuse, séparée de la première électrode poreuse par un électrolyte solide, et un élément d'isolement disposé entre le logement de joint métallique et l'électrolyte et la seconde électrode. Un ou plusieurs éléments de brasure raccordent structurellement et électriquement la première électrode au logement de joint métallique et forment un joint étanche au gaz entre la première électrode et la seconde électrode.

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