The disclosed embodiments provide a fuel cell plate. The fuel cell plate includes a substrate of electrically conductive material and a first outer layer of corrosion-resistant material bonded to a first portion of the substrate. To reduce the weight of the fuel cell plate, the electrically conductive material and the corrosion-resistant material are selected to be as light as practicable.

An electrochemical system has at least one endplate, a terminal bipolar plate as well as a sealing device arranged between the endplate and the terminal bipolar plate. The materials of the terminal bipolar plate and the endplate have different coefficients of thermal expansion and with the sealing device being designed in such a way that during temperature changes, the sealing function is also given by a sliding of the endplate and/or the terminal bipolar plate along the sealing device.

An electrochemical system has at least one endplate, a terminal bipolar plate as well as a sealing device arranged between the endplate and the terminal bipolar plate. The materials of the terminal bipolar plate and the endplate have different coefficients of thermal expansion and with the sealing device being designed in such a way that during temperature changes, the sealing function is also given by a sliding of the endplate and/or the terminal bipolar plate along the sealing device.

A fuel cell stack includes at least two cell modules adjacent to each other, the at least two cell modules each being formed by stacking a plurality of fuel cells into an integrated unit and a seal plate interposed in a cooling flow channel defined between separators of the at least two cell modules, the cooling flow channel configured to allow a cooling fluid to flow therethrough. The seal plate includes a manifold portion in which a plurality of manifold holes are formed to allow two power-generation gases to flow separately through the plurality of manifold holes and through the plurality of fuel cells and a seal member provided along a peripheral portion of each of the plurality of manifold holes to provide sealing for a corresponding one of the two power-generation gases flowing through the manifold hole.

According to one embodiment, an electrochemical cell 1 includes: an electrode layered body 10 having an electrolyte 10e having a first surface 10e1 and a second surface 10e2 positioned opposite to the first surface 10e1, a cathode 10c in contact with the first surface 10e1, and an anode 10a in contact with the second surface 10e2; and a gas-flow suppression part 20 that is positioned at least partially adjacent to a side surface of the electrode layered body 10, and is formed from a material different from those of the electrolyte 10e, the cathode 10c, and the anode 10a.

An end plate for a fuel cell is provided in which a main block is configured to form a body and support a fuel cell at a predetermined pressure and a subplate is configured to include a material having reducibility higher than that of the main block and to adhere to one side of the main block. Additionally, an insulating part encloses the main block and the subplate.

An end plate for a fuel cell is provided in which a main block is configured to form a body and support a fuel cell at a predetermined pressure and a subplate is configured to include a material having reducibility higher than that of the main block and to adhere to one side of the main block. Additionally, an insulating part encloses the main block and the subplate.

Proposed is a fuel cell membrane humidifier which includes a main housing, a hollow fiber membrane cartridge including a seal mount and a fixing layer, an inlet housing including a coupling portion, a seal ground portion, and a main chamber, an outlet housing including a coupling portion, a gas inflow port, a second chamber, and a cartridge insertion portion, a variable seal including a body portion, and a rib elastically transformed with respect to the body portion and being in close contact with the seal ground portion, and a back pressure passage communicating between the main chamber and the seal ground portion, wherein the ground pressure of the rib on the seal ground portion is formed to increase in correspondence to the pressure of dry air of the main chamber introduced through the back pressure passage when the dry air is supplied.

Proposed is a fuel cell membrane humidifier which includes a main housing, a hollow fiber membrane cartridge including a seal mount and a fixing layer, an inlet housing including a coupling portion, a seal ground portion, and a main chamber, an outlet housing including a coupling portion, a gas inflow port, a second chamber, and a cartridge insertion portion, a variable seal including a body portion, and a rib elastically transformed with respect to the body portion and being in close contact with the seal ground portion, and a back pressure passage communicating between the main chamber and the seal ground portion, wherein the ground pressure of the rib on the seal ground portion is formed to increase in correspondence to the pressure of dry air of the main chamber introduced through the back pressure passage when the dry air is supplied.

A fuel cell includes a membrane electrode assembly; a frame configured to support the membrane electrode assembly from its outer edge; a first separator plate and a second separator plate configured to sandwich the membrane electrode assembly and the frame therebetween; and an elastomer. The first separator plate includes an elastically deformable protruding portion projecting toward an opposite side to the frame. The frame has a recessed cavity portion facing the protruding portion of the first separator plate. The elastomer is placed in at least part of the cavity portion.