Fuel cell stack and fuel gas release method
One side of a casing of a fuel cell stack is provided with an opening, a filter permeable to a fuel gas, and a cover covering the filter. The cover includes a first vent connecting the inside and the outside of the cover, and a second vent provided below the first vent and connecting the inside and the outside of the cover.
1 . A fuel cell stack comprising:
a cell stack body including a plurality of power generation cells; and
a casing housing at least one of the cell stack body or a fuel cell auxiliary device, wherein the casing comprises:
a side including an opening;
a filter attached to the opening and permeable to a fuel gas; and
a cover provided outside the filter, and
the cover comprises:
a first vent configured to connect an inside and an outside of the cover; and
a second vent provided at a position lower than the first vent and configured to connect the inside and the outside of the cover
the casing includes a support member supporting an outer peripheral portion of the filter and having an opening for ventilation, and
the cover presses the support member toward the side.
2 . The fuel cell stack according to claim 1 , wherein
the cover further comprises: a cover body facing the filter and formed with the first vent and the second vent;
a pressing part projecting from an outer peripheral part of the cover body toward the support member and pressing the support member; and
the cover body is positioned apart from the support member.
3 . The fuel cell stack according to claim 2 , wherein
the filter, the support member, and the cover body are accommodated in a recess formed on the side, and
the cover includes a fixing portion fixed to the side wall portion outside the recess, and
the fixing portion of the cover protrudes from the cover body in a direction opposite to a direction in which the pressing part protrudes from the cover body.
4 . The fuel cell stack according to claim 3 , wherein
the cover is provided with a plurality of fixing portions including the fixing portion, and
the plurality of fixing portions of the cover are arranged along a horizontal direction with a space between each of the plurality of fixing portions, and
along the horizontal direction, the first vent and the second vent are provided between the fixing portions adjacent to each other among the plurality of fixing portions.
5 . The fuel cell stack according to claim 1 , wherein
a seal member is disposed between the support member and the side so as to surround the opening, and
the seal member is compressed in the thickness-wise direction of the side between the support member and the side by the cover pressing the support member.
6 . The fuel cell stack according to claim 1 , wherein the side provided with the opening is a front wall portion of the casing.
7 . A fuel gas release method for a fuel cell stack comprising a cell stack body including a plurality of power generation cells, and a casing housing at least one of the cell stack body or a fuel cell auxiliary device, wherein
the casing comprises:
a side including an opening;
a filter attached to the opening and permeable to a fuel gas; and
a cover attached outside the filter, the cover comprises:
a first vent configured to connect an inside and an outside of the cover; and
a second vent provided at a position lower than the first vent and configured to connect the inside and the outside of the cover,
the method comprising:
releasing the fuel gas from the inside to the outside of the cover through the first vent; and
taking in air from the outside to the inside of the cover through the second vent.