Fuel cell stack assembly and method of operating the same
A fuel cell stack assembly and method of operating the same are provided. The assembly includes a fuel cell stack column and side baffles disposed on opposing sides of the column. The side baffles and the fuel cell stack may have substantially the same coefficient of thermal expansion at room temperature. The side baffles may have a laminate structure in which one or more channels are formed.
1. A fuel cell stack assembly comprising:
a fuel cell stack column having an open face and opposing sides extending perpendicular to the open face; and
side baffles disposed on the opposing sides of the column, the side baffles each comprising first, second, and third ceramic baffle plates that are laminated to one another, the second baffle plates being disposed between the first and third baffle plates, and the fuel cell stack column is disposed between the third baffle plates of the side baffles, such that the open face is exposed between the side baffles; and
wherein the second baffle plates comprise air channels configured to cool the column and that extend through the second baffle plates and bypassing the fuel cell stack column in a direction perpendicular to the open face of the fuel cell stack column and perpendicular to a stacking direction of fuel cells of the column.
2. The fuel cell stack assembly of claim 1 , wherein the air channels do not extend through the first or third baffle plates.
3. The fuel cell stack assembly of claim 1 , further comprising:
a compression assembly disposed on a first end of the column; and
a lower block disposed on an opposing second end of the column,
wherein the side baffles connect the compression assembly and the lower block, such that a spring of the compression assembly applies a compressive force to the column.
4. The fuel cell stack assembly of claim 1 , wherein the air channels are disposed at a higher density adjacent to the center of the column than at ends of the column.
5. The fuel cell stack assembly of claim 1 , wherein:
the air is configured to be blown horizontally into the stack assembly into the open face of the fuel cell stack column and into the air channels;
a first portion of the air fed into the open face of the fuel cell stack column is used as an oxidizer in an electrochemical power generation reaction; and
a second portion of the air fed through the air channels is configured to cool the fuel cell stack column.