Fuel cell vehicle having hydrogen detection in fuel cell accommodation space below front cabin

1. A fuel cell vehicle comprising:

a cabin arranged at a vehicle front portion and provided with a seat therein where an occupant is seated;

a fuel cell mounted below the cabin;

an accommodation space formed below the cabin and accommodating the fuel cell, wherein

an upper side of the accommodation space is covered with a ceiling surface formed by a bottom portion of the cabin, and a rear side of the accommodation space is opened to outside of the accommodation space to allow gas inside the accommodation space to be discharged, and

the ceiling surface is provided with a detector configured to detect a hydrogen concentration in the accommodation space;

an exhaust portion that is opened upward in an upper surface of the cabin to allow the gas to be discharged to outside of the vehicle through the exhaust portion; and

a communication passage that communicates with the accommodation space and the exhaust portion, wherein

the communication passage is connected to the exhaust portion and the ceiling surface is upwardly inclined from a front side toward the rear side in a side view such that the gas moves along the ceiling surface with the detector toward the rear side located in a higher position.

2. The fuel cell vehicle according to claim 1 , wherein

the ceiling surface is upwardly inclined toward a center in a vehicle width direction in a rear view such that the gas moves along the ceiling surface toward the center located in a higher position.

3. The fuel cell vehicle according to claim 1 , wherein

the exhaust portion and the communication passage are constituted of recessed portions formed in a rear surface of the cabin.

4. The fuel cell vehicle according to claim 1 , wherein

the ceiling surface is upwardly inclined toward a connection portion between the accommodation space and the communication passage such that the gas moves along the ceiling surface toward the connection portion in a higher position.

5. The fuel cell vehicle according to claim 1 , further comprising:

an under cover that faces the ceiling surface in an up-down direction and covers a lower side of the fuel cell, wherein

a lower side of the accommodation space is covered with the under cover.

6. The fuel cell vehicle according to claim 1 , further comprising:

a deck portion provided behind the cabin;

a hydrogen tank that is mounted below the deck portion and is compressively filled with hydrogen; and

a hydrogen pipe that connects the hydrogen tank and the fuel cell, wherein

the hydrogen pipe is provided with a temperature activated pressure relief device, and

the temperature activated pressure relief device is arranged between the cabin and the deck portion in a front-rear direction.

7. The fuel cell vehicle according to claim 1 , further comprising:

a vehicle body that has a frame structure including a pair of left and right side members extending in a front-rear direction;

a hydrogen tank that is arranged behind the cabin and is compressively filled with hydrogen;

a hydrogen pipe that connects the hydrogen tank and the fuel cell;

a secondary battery arranged behind the cabin;

a drive motor arranged behind the cabin; and

a power line that electrically connects the fuel cell, the secondary battery, and the drive motor, wherein

the secondary battery, the drive motor, and the power line are arranged between the pair of left and right side members,

the hydrogen tank is arranged on an outer side of the pair of left and right side members in a vehicle width direction, and

the hydrogen pipe is provided above the power line and below the detector in a side view.