In a fuel cell system, a stack case which stores a stack body of power generation cells and an auxiliary device case are separated by a partition wall. An outer periphery of at least one end fluid passage provided at least at the uppermost position, among the fluid passages of the stack body, has an adjacent outer peripheral portion provided adjacent to an outer marginal portion of the stack body. The partition wall includes a facing portion. The facing portion faces an area that lies between the adjacent outer peripheral portion and the stack case and outside the outer marginal portion. At least part of a ventilation connection port configured to connect the inside of the stack case with the inside of the auxiliary device case is provided in the facing portion. The ventilation connection port has a curved shape formed along the adjacent outer peripheral portion.

A fuel cell system includes a stack case and an auxiliary device case. The stack case stores a stack including a power generation cell stack body including a plurality of power generation cells stacked horizontally in a stacking direction, and an insulating plate stacked at an end of the power generation cell stack body in the stacking direction. The auxiliary device case stores a fuel cell auxiliary device. The inside of the stack case and the inside of the auxiliary device case that are adjacent to each other in the stacking direction are separated by a partition wall. The partition wall has ventilation connection ports. The ventilation connection ports connect the inside of the stack case with the inside of the auxiliary device case. The insulating plate provided closer to the partition wall, than the power generation cell stack body, inside the stack case faces the ventilation connection ports.

A fuel cell system includes a stack case and an auxiliary device case. The stack case stores a stack including a power generation cell stack body including a plurality of power generation cells stacked horizontally in a stacking direction, and an insulating plate stacked at an end of the power generation cell stack body in the stacking direction. The auxiliary device case stores a fuel cell auxiliary device. The inside of the stack case and the inside of the auxiliary device case that are adjacent to each other in the stacking direction are separated by a partition wall. The partition wall has ventilation connection ports. The ventilation connection ports connect the inside of the stack case with the inside of the auxiliary device case. The insulating plate provided closer to the partition wall, than the power generation cell stack body, inside the stack case faces the ventilation connection ports.

A muffler may include a thin plate mesh provided in an internal space of an inlet chamber formed at a side opposite to an outlet chamber of a muffler housing such that gas contained in exhaust fluid passes through the thin plate mesh by collision of the exhaust fluid against the thin plate mesh and water contained in the exhaust fluid is separated from the gas; a water movement guide fluidically-connected to the inlet chamber and the outlet chamber for allowing the water gathered at the front side of the thin plate mesh in the internal space of the inlet chamber to flow therein and move to the outlet chamber; and a muffler pipe connected to the inlet chamber and the outlet chamber for allowing the gas gathered at the rear side of the thin plate mesh in the internal space of the inlet chamber to move to the outlet chamber.

A gas sensor includes a first electrode having a first main surface and a second main surface opposite to the first main surface; a second electrode having a third main surface facing the second main surface and a fourth main surface opposite to the third main surface; a metal oxide layer disposed between the first electrode and the second electrode, and being in contact with the second main surface and the third main surface; and an insulating film covering at least a part of the first electrode, a part of the second electrode, and at least a part of the metal oxide layer. At least a part of the fourth main surface is exposed to gas which contains a gas molecule including a hydrogen atom. A resistance value of the metal oxide layer decreases when the second electrode is in contact with the gas molecule.

A gas sensor includes a first electrode having a first main surface and a second main surface opposite to the first main surface; a second electrode having a third main surface facing the second main surface and a fourth main surface opposite to the third main surface; a metal oxide layer disposed between the first electrode and the second electrode, and being in contact with the second main surface and the third main surface; and an insulating film covering at least a part of the first electrode, a part of the second electrode, and at least a part of the metal oxide layer. At least a part of the fourth main surface is exposed to gas which contains a gas molecule including a hydrogen atom. A resistance value of the metal oxide layer decreases when the second electrode is in contact with the gas molecule.

An electric vehicle which can travel using a power generator that generates electric power based on hydrogen without increasing the size of the hydrogen tank, is provided. An electric vehicle includes a first tank configured to store an organic hydride, a dehydrogenation reactor that has a first passage including a first catalyst for accelerating dehydrogenation reaction of the organic hydride supplied from the first tank and separates the organic hydride supplied to the first passage into hydrogen and an aromatic compound, a power generator configured to generate electric power using hydrogen supplied from the dehydrogenation reactor, a power storage configured to store electric power generated by the power generator, and a motor drivable on electric power from at least one of the power generator and the power storage to rotate a wheel.

An outer surface of an upper wall of a stack case of a fuel cell system provided in a fuel cell vehicle includes a first outer surface, a second outer surface which is positioned closer than the first outer surface to a cell stack body, and an outer surface coupling part. Space is formed between a first upper wall of the upper wall and the cell stack body. Tabs and bus bars are disposed in the space.

An outer surface of an upper wall of a stack case of a fuel cell system provided in a fuel cell vehicle includes a first outer surface, a second outer surface which is positioned closer than the first outer surface to a cell stack body, and an outer surface coupling part. Space is formed between a first upper wall of the upper wall and the cell stack body. Tabs and bus bars are disposed in the space.

A fuel cell vehicle includes a fuel cell, a drive motor, and a drive unit. The drive motor is configured to be driven with electricity of the fuel cell. The drive unit is configured to transmit driving force from the drive motor. The fuel cell, the drive motor, and the drive unit are disposed in a front space of the vehicle. The fuel cell is mounted via a first frame coupled to a body. The drive motor and the drive unit are mounted via a second frame that is coupled to the body and that is different from the first frame.