Fuel cell and fuel cell stack

摘要

A fuel cell includes a separator having a circular disk. On one surface of the circular disk, a fuel gas channel for supplying a fuel gas to an anode is provided, and on the other surface of the circular disk, an oxygen-containing gas channel for supplying air to a cathode is provided. The fuel gas channel has an end point disposed at the outer circumferential end of the anode. A fuel gas discharge channel is connected to the end point of the fuel gas channel, such that the consumed fuel gas is emitted from a position spaced outwardly from an outer circumferential portion of the electrolyte electrode assembly.

主权项

1. A fuel cell formed by stacking an electrolyte electrode assembly and a separator, said electrolyte electrode assembly including an anode, a cathode, and an electrolyte interposed between said anode and said cathode, said fuel cell comprising:
a fuel gas channel formed and extending on one surface of said separator for supplying a fuel gas along a surface of said anode, the separator including an outer circumference partially extended to form a plate-shaped extension protruding outwardly from an outer circumferential portion of the electrolyte electrode assembly; and an oxygen-containing gas channel formed on an other surface of said separator, for supplying an oxygen-containing gas along a surface of said cathode, wherein said fuel gas channel has an end point disposed at a first position corresponding to the outer circumferential portion of said electrolyte electrode assembly, and wherein a through hole extending from the one surface to the other surface of the separator connects the end point of said fuel gas channel on the one surface to a fuel gas discharge channel formed and extending on the other surface for emitting the fuel gas consumed in said electrolyte electrode assembly, the fuel gas discharge channel formed by the plate-shaped extension, the fuel gas emitted from a second position spaced outwardly from the first position corresponding to the outer circumferential portion of said electrolyte electrode assembly, and wherein a discharge groove member as a member separate from the separator is fixed to said plate-shaped extension, and said fuel gas discharge channel is formed between said plate-shaped extension and said discharge groove member, the discharge groove member starting on the other surface of the separator from the fuel gas channel at a location of the end point of the fuel gas channel at the outer circumferential portion and extending to the end of the plate-shaped extension.