A fuel cell battery includes a plurality of stacks. Each of the stacks is a module containing a cell, and a base plate and a cover plate sandwiching the cell therebetween. In a state where the stacks are stacked together with a gasket being sandwiched between two adjacent stacks of the stacks, the two adjacent stacks are connected to each other by a connecting bolt. The gasket has, at a central part thereof, a contact plate that is elastic and electrically conductive. When the gasket is sandwiched between the two adjacent stacks, the contact plate is brought into abutment with the cover plate and the base plate.

A fuel cell system for a vehicle for preventing intrusion of water in a relief valve without providing a casing or a waterproof sheet for the relief valve is provided. The fuel cell system comprises a fuel cell stack placed in a front room of a vehicle, a power control unit to perform output control of the fuel cell stack, a hydrogen supply path for supplying hydrogen gas to the fuel cell stack, and the relief valve provided in half way of the hydrogen supply path. The relief valve is placed above the fuel cell stack in the front room and includes an exhaust port. The exhaust port is placed facing an upper surface of a casing of the power control unit with a clearance such that the hydrogen gas is ejected downward through the exhaust port in the direction of gravity.

A fuel cell system for a vehicle for preventing intrusion of water in a relief valve without providing a casing or a waterproof sheet for the relief valve is provided. The fuel cell system comprises a fuel cell stack placed in a front room of a vehicle, a power control unit to perform output control of the fuel cell stack, a hydrogen supply path for supplying hydrogen gas to the fuel cell stack, and the relief valve provided in half way of the hydrogen supply path. The relief valve is placed above the fuel cell stack in the front room and includes an exhaust port. The exhaust port is placed facing an upper surface of a casing of the power control unit with a clearance such that the hydrogen gas is ejected downward through the exhaust port in the direction of gravity.

A separator supporting structure includes a metal lug provided on a separator, a set of protrusions that protrude from an inner surface of a metal casing toward the separator to form a recess into which the lug is inserted, a first insulating portion covering the lug at least in the recess, and a second insulating portion extending from the first insulating portion and between the separator and each of the protrusions.

A separator supporting structure includes a metal lug provided on a separator, a set of protrusions that protrude from an inner surface of a metal casing toward the separator to form a recess into which the lug is inserted, a first insulating portion covering the lug at least in the recess, and a second insulating portion extending from the first insulating portion and between the separator and each of the protrusions.

A fuel gas supply path in a fuel cell stack includes in series a first path, a second path, and a third path. In the second path, two inlets of the fuel gas in each of power generating cells included in the second path are located at a first position PA and a second position PB, and the position of one outlet of the fuel gas in each power generating cell is located at a third position PC. In the third path, an inlet of the fuel gas in each of power generating cells included in the third path is located at a position coinciding with the third position PC when the power generating cells are viewed in the stacking direction, and an outlet of the fuel gas in each power generating cell is located at a position between the first position PA and the second position PB.

A fuel gas supply path in a fuel cell stack includes in series a first path, a second path, and a third path. In the second path, two inlets of the fuel gas in each of power generating cells included in the second path are located at a first position PA and a second position PB, and the position of one outlet of the fuel gas in each power generating cell is located at a third position PC. In the third path, an inlet of the fuel gas in each of power generating cells included in the third path is located at a position coinciding with the third position PC when the power generating cells are viewed in the stacking direction, and an outlet of the fuel gas in each power generating cell is located at a position between the first position PA and the second position PB.

A fuel cell vehicle that reduces damage on a fuel gas pump and deformation of a dash panel toward a cabin side when the vehicle collides head-on. The fuel gas pump is secured to a stack frame via a bracket such that a rotation, axis line of a motor adapted to drive a fuel gas pump inclines with respect to a reference line along the from-rear direction of the vehicle in plan view of the vehicle. Two fastening members secure the stack frame to the bracket in a state of being respectively inserted through a through hole and a cutout portion formed at a mounting portion. The cutout portion is formed such that, when the bracket turns together with the fuel gas pump with respect to the stack frame using one fastening member as a rotational center, the other fastening member exits out of an opening of the cutout portion.

An electrochemical module including: a stack obtained by stacking, in a predetermined stacking direction, a plurality of electrochemical elements having a configuration in which an electrode layer, an electrolyte layer, and a counter electrode layer are formed along a substrate, via an annular sealing portion through which first gas that is one of reducing component gas and oxidative component gas flows; a container that includes an upper cover for pressing a first flat face in the stacking direction of the stack and a lower cover for pressing a second flat face on a side opposite to the first flat face, the stack being sandwiched between the upper cover and the lower cover; and a pressing mechanism that presses a portion to which the annular sealing portion is attached against the container in the stacking direction.

An electrochemical module including: a stack obtained by stacking, in a predetermined stacking direction, a plurality of electrochemical elements having a configuration in which an electrode layer, an electrolyte layer, and a counter electrode layer are formed along a substrate, via an annular sealing portion through which first gas that is one of reducing component gas and oxidative component gas flows; a container that includes an upper cover for pressing a first flat face in the stacking direction of the stack and a lower cover for pressing a second flat face on a side opposite to the first flat face, the stack being sandwiched between the upper cover and the lower cover; and a pressing mechanism that presses a portion to which the annular sealing portion is attached against the container in the stacking direction.