Fuel cell stack and method of producing its separator plates

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2651627

A cell (2) of a fuel cell includes a membrane electrode assembly (3), and metal first (7A) and second (7C) separators which sandwich the membrane electrode assembly to form gas flow paths (8A, 8C) disposed on each side of the membrane electrode assembly. A back surface (26) of the first separator and a back surface (26) of the second separator, the first separator and the second separator being included in adjacent cells, are in contact with each other, thereby forming a temperature-control medium flow path (9) between the first separator and the second separator. In the first separator and the second separator, corrosion-resistant coating layers (27) are provided only on reaction-side surfaces (25) of the first separator and the second separator, the reaction-side surfaces facing the membrane electrode assembly, and portions where the back surface of the first separator is in contact with the back surface of the second separator are joined by welded portions (10).

Selon l'invention, une cellule (2) appartenant à une pile à combustible comprend un ensemble d'électrodes à membrane (3) et des premier (7A) et second (7C) séparateurs métalliques qui comprennent l'ensemble d'électrodes à membrane pour former des voies d'écoulement de gaz (8A, 8C) disposées sur chaque côté de l'ensemble d'électrodes à membrane. Une surface arrière (26) d'un premier séparateur et une surface arrière (26) d'un second séparateur, dont les séparateurs sont compris dans des cellules adjacentes, sont en contact entre elles, ce qui permet de former une voie d'écoulement centrale à température régulée (9) entre le premier et le second séparateur. Dans le premier et le second séparateur, des couches de revêtement résistant à la corrosion (27) se trouvent uniquement sur des surfaces côté réaction (25) du premier et du second séparateur, ces surfaces étant opposées à l'ensemble d'électrodes à membrane, et des parties où la surface arrière du premier séparateur est en contact avec la surface arrière du second séparateur sont jointes par des parties soudées (10).

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