Seal for a fuel cell stack

H - Electricity – 01 – M

Patent

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Details

H01M 2/00 (2006.01) H01M 2/08 (2006.01) H01M 2/14 (2006.01) H01M 2/18 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01) H01M 8/12 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2453095

A fuel cell stack comprising alternating solid oxide fuel cell plates (10) and gas separator plates (30) stacked face to face with one or more seal assemblies (34, 36, 37, 38, 40) provided between opposed generally planar surfaces (33, 54) of each adjacent pair of plates. Each seal assembly comprises a pair of rigid ribs (36, 37) projecting from one surface (33) with a valley (38) therebetween and a third rigid rib (34) projecting from the other surface (54) and nested between the pair of ribs. Opposed contact surfaces (54, 60, 61) cooperate to define the maximum insertion of the third rib (34) into the valley (38). The third rib (34) has a profile that leaves a void between the valley (38) and the third rib (34) at said maximum insertion. A glass sealant (40) in said void contacts the surface of the valley (38) and the third rib (34). In a preferred embodiment each rib (34, 36, 37) tapers away from the respective surface (33, 54) towards a distal surface (51, 61) of the rib.

Empilage de piles à combustible comprenant des plaques de piles à combustible en oxyde solide (10) alternant avec des plaques de séparateur de gaz (30), empilées face à face avec un ou plusieurs ensembles d'étanchéité (34, 36, 37, 38, 40) prévus entre des surfaces généralement planes, opposées (33, 54) de chaque paire adjacente de plaques. Chaque ensemble d'étanchéité comprend une paire de nervures rigides (36, 37) en saillie à partir d'une surface (33), ménageant un creux (38) entre elles, et une troisième nervure rigide (34), en saillie par rapport à l'autre surface (54) et encastrée entre les paires de nervures. Les surfaces de contact opposées (54, 60, 61) coopèrent pour définir l'insertion maximale de la troisième nervure (34) dans le creux (38). La troisième nervure (34) présente un profil qui laisse un vide entre le creux (38) et la troisième nervure (34) à ladite insertion maximale. Un matériau d'étanchéité en verre (40) dans ledit vide réalise le contact avec la surface du creux (38) et la troisième nervure (34). Selon une forme d'exécution préférée, chaque nervure (34, 36, 37) s'amincit à partir de la surface respective (33, 54) vers une surface distale (51, 61) de la nervure.

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