In order to create an electrochemical device, comprising a plurality of electrochemical units, which succeed one another along a stack direction, wherein each electrochemical unit comprises a bipolar plate and an electrically insulating seal, and a clamping device for clamping the electrochemical units along the stack direction, in which electrochemical device the risk of a short circuit between adjacent bipolar plates is reduced without the expenditure for the production of the electrochemical device being excessively increased, it is proposed that at least one seal of at least one electrochemical unit in the pressed state protrudes laterally beyond a contour of the bipolar plate of the electrochemical unit in a direction of protrusion directed perpendicularly to the stack direction.

In order to create an electrochemical device, comprising a plurality of electrochemical units, which succeed one another along a stack direction, wherein each electrochemical unit comprises a bipolar plate and an electrically insulating seal, and a clamping device for clamping the electrochemical units along the stack direction, in which electrochemical device the risk of a short circuit between adjacent bipolar plates is reduced without the expenditure for the production of the electrochemical device being excessively increased, it is proposed that at least one seal of at least one electrochemical unit in the pressed state protrudes laterally beyond a contour of the bipolar plate of the electrochemical unit in a direction of protrusion directed perpendicularly to the stack direction.

A method for use in manufacturing a fuel cell stack includes assembling a membrane electrode assembly to have a membrane between a first gas diffusion layer and a second gas diffusion layer. A bypass blocker is located at a space between a first gas diffusion layer of the membrane electrode assembly and a seal. The blocker is deformed on the seal and deformation is avoided of the blocker at the space such that the blocker inhibits a bypass flow of a reactant through the space between the gas diffusion layer and the seal in a direction of flow of the reactant during operation of the fuel cell. The membrane electrode assembly is located between a first fluid flow plate and a second fluid flow plate.

A method for use in manufacturing a fuel cell stack includes assembling a membrane electrode assembly to have a membrane between a first gas diffusion layer and a second gas diffusion layer. A bypass blocker is located at a space between a first gas diffusion layer of the membrane electrode assembly and a seal. The blocker is deformed on the seal and deformation is avoided of the blocker at the space such that the blocker inhibits a bypass flow of a reactant through the space between the gas diffusion layer and the seal in a direction of flow of the reactant during operation of the fuel cell. The membrane electrode assembly is located between a first fluid flow plate and a second fluid flow plate.

A fuel cell includes: a membrane electrode assembly of a flat plate shape including an electrolyte membrane and an electrode catalyst layer, the membrane electrode assembly having a first side intersecting a flow pathway of a reactive gas on a surface of the fuel cell and a second side differing from the first side; a frame member of a flat plate shape including an opening part for arrangement of the membrane electrode assembly, the opening part having a first frame side corresponding to the first side and a second frame side corresponding to the second side; and an adhesive member for bonding between an outer periphery of the membrane electrode assembly and an inner periphery of the frame member. The thickness of the adhesive member in an area from an inner peripheral edge at the second frame side toward a center of the frame member may be greater than the thickness of the adhesive member in an area from an inner peripheral edge at the first frame side toward the center of the frame member.

In a manufacturing method for fuel cell separators having a seal part of convex shape that is pushed when superimposed with another separator, the method includes: a first pressing step of imparting work hardening to an entire region to become a convex shape configuring the seal part; and a second pressing step of press molding the region work hardened in the first pressing step so as to become a convex shape.

A resin frame member is produced by using a method of producing a resin frame member for a fuel cell. An inner peripheral end of the resin frame member includes an inclined surface formed over the entire periphery thereof. The inclined surface is inclined inward from one surface of the resin frame member toward the other surface of the resin frame member. The width of the inclined surface is gradually reduced from the center toward both ends of each side part of the inner peripheral end in a direction in which the side part of the inner peripheral end extends.

A resin frame member is produced by using a method of producing a resin frame member for a fuel cell. An inner peripheral end of the resin frame member includes an inclined surface formed over the entire periphery thereof. The inclined surface is inclined inward from one surface of the resin frame member toward the other surface of the resin frame member. The width of the inclined surface is gradually reduced from the center toward both ends of each side part of the inner peripheral end in a direction in which the side part of the inner peripheral end extends.

The invention relates to an electrochemical system unit comprising a plurality of electrochemical cells that are arranged in layers side by side, each cell comprising an anode plate, a cathode plate and a sealing element, wherein the sealing element is designed to seal a space between the anode and cathode plate. Said system also comprises at least two electrochemical cells of the electrochemical system unit having different manufacturing types of the sealing elements.

The invention relates to an electrochemical system unit comprising a plurality of electrochemical cells that are arranged in layers side by side, each cell comprising an anode plate, a cathode plate and a sealing element, wherein the sealing element is designed to seal a space between the anode and cathode plate. Said system also comprises at least two electrochemical cells of the electrochemical system unit having different manufacturing types of the sealing elements.