Fuel cell stack

摘要

The present invention provides a fuel cell stack that has a separator arranged between fuel cells, the separator including: a sandwiching section which sandwiches an electrolyte electrode assembly and includes a fuel gas channel and a separately provided oxygen-containing gas channel; a bridge which is connected to the sandwiching section and includes a reactant gas supply channel; a reactant gas supply section which is connected to the bridge and includes a reactant gas supply passage; and a connecting section that connects the sandwiching section to the bridge.

主权项

1. A fuel cell stack in which electrolyte electrode assemblies are stacked alternately between adjacent separators in a stacking direction to form the fuel cell stack, each electrolyte electrode assembly including an anode, a cathode, and an electrolyte interposed between the anode and the cathode,
wherein the electrolyte electrode assemblies are sandwiched by sandwiching sections of adjacent separators, wherein each sandwiching section includes a fuel gas channel that supplies fuel gas to an electrode face of the anode and a separately provided oxygen-containing gas channel that supplies oxygen-containing gas to an electrode face of the cathode, the fuel gas and the oxygen-containing gas being discharged after use from a circumferential edge of the electrolyte electrode assembly, wherein the sandwiching section is formed in a shape of a circular disk; wherein each of the separators further comprises: a bridge that is connected to the sandwiching section and includes a reactant gas supply channel that supplies the fuel gas to the fuel gas channel or the oxygen-containing gas to the oxygen-containing gas channel; a reactant gas supply section that is connected to the bridge and includes a reactant gas supply passage that supplies the fuel gas or the oxygen-containing gas to the reactant gas supply channel, the reactant gas supply passage being formed in a stacking direction of the separator; and a connecting section that connects the sandwiching section to the bridge such that a tangential direction of a circumferential edge of the sandwiching section at the connecting section is substantially same as a tangential direction of a circumferential edge of the bridge at the connecting section, wherein the bridge is a circular arc shaped member having a radius that is larger than the radius of the sandwiching section, and the connecting section between the sandwiching section and the bridge is formed as a smoothly continuous plane, and does not protrude outside the diameter direction of the sandwiching section.