Fuel cell

摘要

A fuel cell is provided with a separator that supports an electrolyte/electrode assembly sandwiched therebetween. The separator is provided with: first and second fuel gas supply parts in the center of which fuel gas supply holes are formed; first and second cross-link parts connected to the first and second fuel gas supply parts; and first and second surrounding support parts connected to the first and second cross-link parts. Each first surrounding support part is provided with a set of fuel gas exhaust passages that discharge fuel gas that has gone through a fuel gas passage and been used. The cross-sectional areas of the fuel gas exhaust passages are larger on the downstream sides than on the upstream sides, in terms of the direction of fuel gas flow.

主权项

1. A fuel cell formed by stacking electrolyte electrode assemblies and separators alternately in a stacking direction, the electrolyte electrode assemblies each including an anode, a cathode, and an electrolyte interposed between the anode and the cathode, the separators each including:
a sandwiching section for sandwiching the electrolyte electrode assembly, a fuel gas channel for supplying a fuel gas along an electrode surface of the anode of one electrolyte electrode assembly and an oxygen-containing gas channel for supplying an oxygen-containing gas along an electrode surface of the cathode of another electrolyte electrode assembly being individually formed in the sandwiching section; a bridge connected to the sandwiching section, a fuel gas supply channel for supplying the fuel gas to the fuel gas channel being formed in the bridge; and a fuel gas supply section connected to the bridge, a fuel gas supply passage extending through the fuel gas supply section in the stacking direction for supplying the fuel gas to the fuel gas supply channel, the sandwiching section including:
a fuel gas inlet for supplying the fuel gas to the fuel gas channel;an outer circumferential protrusion protruding toward the fuel gas channel, and contacting an outer circumference of the anode; and a plurality of fuel gas outlet channels formed in the outer circumferential protrusion and provided on a side opposite to the portion connecting the sandwiching section and the bridge, wherein the plurality of fuel gas outlet channels includes:
a first plurality of fuel gas outlet channels provided on a first side of an extended line of the bridge, anda second plurality of fuel gas outlet channels provided on a second side of the extended line of the bridge, wherein, in each of the plurality of fuel gas outlet channels, a cross sectional area on a downstream side of the fuel gas outlet channel in a gas flow direction of the fuel gas is larger than a cross sectional area on an upstream side of the fuel gas outlet channel in the gas flow direction of the fuel gas.