초록 ▼

First gas flow passage grooves communicating with a fuel gas inlet and second gas flow passage grooves communicating with a fuel gas outlet are provided on a surface of a first separator. First and second united sections are provided at merged portions of the first gas flow passage grooves and the s

First gas flow passage grooves communicating with a fuel gas inlet and second gas flow passage grooves communicating with a fuel gas outlet are provided on a surface of a first separator. First and second united sections are provided at merged portions of the first gas flow passage grooves and the second gas flow passage grooves. Accordingly, the number of gas flow passage grooves is throttled from the side of the fuel gas inlet to the side of the fuel gas outlet. The turbulence is allowed to occur at the throttled portion to make it possible to improve the gas diffusion performance.

대표청구항 ▼

[ What is claimed is:] [1.]1. A fuel cell stack comprising a plurality of fuel cell units each composed of an electrolyte interposed between an anode electrode and a cathode electrode, said plurality of fuel cell units being stacked with separators intervening therebetween, wherein:a fluid passage f

[ What is claimed is:] [1.]1. A fuel cell stack comprising a plurality of fuel cell units each composed of an electrolyte interposed between an anode electrode and a cathode electrode, said plurality of fuel cell units being stacked with separators intervening therebetween, wherein:a fluid passage for allowing a fluid to flow therethrough is provided in a surface of said separator, said fluid containing at least any one of a fuel gas to be supplied to said anode electrode and an oxygen-containing gas to be supplied to said cathode electrode, and said fluid passage including:m individuals of first gas flow passage grooves formed on a side of a gas inlet provided that m is a natural number;n individuals of second gas flow passage grooves formed on a side of a gas outlet provided that n is a natural number and there is given m>n; anda united section provided at a merged portion of said first gas flow passage grooves and said second gas flow passage grooves, for making communication between said m individuals of first gas flow passage grooves and said n individuals of second gas flow passage grooves in an integrated manner.