Fuel cell with ceramic-coated bipolar plates and its production

H - Electricity – 01 – M

Patent

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Details

H01M 8/12 (2006.01) H01M 8/02 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2206537

In a high-temperature fuel cell with a solid electrolyte, the solid electrolyte (44) is mounted between metal flanges (30, 30') whose surface is at least partially coated with stabilised zirconium oxide (51, 52) or a similar gas-tight ceramic material with a crystalline structure that solidly adheres to the flanges. This coating narrows the gap between the flanges at the edge of the fuel cell and enables this narrow gap to be filled with a solder glass green foil (53) or similar soldering material that laterally seals the fuel cell in a gas-tight manner when the fuel cell is assembled. The flanges are also insulated from each other. The gas flow channels (31, 31') provided in the flanges for aggressive reaction gasses may also be coated with a thin layer (41, 41') of the same material that protects them against the reaction gasses.

Dans une cellule électrochimique avec un électrolyte solide pour des applications à haute température, l'électrolyte solide (44) est monté entre des joues métalliques (30, 30') dont la surface est au moins partiellement revêtue d'oxyde de zirconium stabilisé (51, 52) ou d'un autre matériau céramique similaire très adhérent et imperméable aux gaz ayant une structure cristalline. Ce revêtement réduit l'espace entre les joues au bord de la cellule électrochimique et permet de remplir cet espace réduit d'une feuille verte de verre de scellement (53) ou d'un matériau similaire de scellement qui scelle latéralement la cellule électrochimique de manière étanche aux gaz lorsque celle-ci est assemblée. Les joues sont elles aussi isolées les unes des autres. Les canaux (31, 31') d'écoulement des gaz de réaction agressifs que contiennent les joues peuvent également être protégés des gaz de réaction par une mince couche de revêtement (41, 41') constituée de ce matériau.

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