Abstract: 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.

Abstract: A fuel cell system includes a fuel cell stack, a stack case storing the fuel cell stack, and an auxiliary device case joined to the stack case, and storing fuel cell auxiliary devices. The auxiliary device case includes an end plate part which applies a tightening load in a stacking direction to the fuel cell stack, as an integral part of the auxiliary device case.

Abstract: A fuel cell system includes a fuel cell stack, a stack case storing the fuel cell stack, and an auxiliary device case joined to the stack case, and storing fuel cell auxiliary devices. The auxiliary device case includes an end plate part which applies a tightening load in a stacking direction to the fuel cell stack, as an integral part of the auxiliary device case.

Abstract: A rotating electric machine includes a ring-shaped cover. The ring-shaped cover includes an outer peripheral portion, an inner peripheral portion, wall portions, an outer peripheral channel, an inner peripheral channel, and radial channels. A coolant supplied into the ring-shaped cover is to flow through the outer peripheral channel by gravity. The coolant is to flow through the inner peripheral channel by gravity. The radical channels include a first radial channel and a second radial channel. The coolant is to flow from the outer peripheral channel to the inner peripheral channel by gravity through the first radial channel. The coolant is to flow from the inner peripheral channel to the outer peripheral channel by gravity through the second radial channel. The coolant is to flow from the second radical channel by gravity through the outer peripheral channel.

Abstract: A rotating electric machine includes a ring-shaped cover. The ring-shaped cover includes an outer peripheral portion, an inner peripheral portion, wall portions, an outer peripheral channel, an inner peripheral channel, and radial channels. A coolant supplied into the ring-shaped cover is to flow through the outer peripheral channel by gravity. The coolant is to flow through the inner peripheral channel by gravity. The radical channels include a first radial channel and a second radial channel. The coolant is to flow from the outer peripheral channel to the inner peripheral channel by gravity through the first radial channel. The coolant is to flow from the inner peripheral channel to the outer peripheral channel by gravity through the second radial channel. The coolant is to flow from the second radical channel by gravity through the outer peripheral channel.