NOVELTY - An integrated fuel cell assembly (100) includes a polymer membrane (25); an anode electrode and a cathode electrode on opposite sides of the polymer membrane; two gas diffusion media comprising microporous layer and a gas diffusion layer (45); a subgasket (55) positioned around a perimeter of one of the gas diffusion media, where the subgasket defines an active area inside the perimeter and having a layer of thermally activated adhesive; a bipolar plate sealed to the subgasket by the layer of thermally activated adhesive to form a gas tight seal, and having an anode side and a cathode side.    USE - An integrated fuel cell assembly.    ADVANTAGE - The assembly is easy to handle and subsequently assemble into a stack, while also maintaining good dimensional alignment between all of the components and features that make up the stack assembly.    DETAILED DESCRIPTION - An integrated fuel cell assembly (100) comprises:    (A) a polymer membrane (25);    (B) an anode electrode and a cathode electrode on opposite sides of the polymer membrane;    (C) two gas diffusion media on opposite sides of the polymer membrane, where the gas diffusion media comprise a microporous layer and a gas diffusion layer (45), where the anode electrode and the cathode electrode positioned between the polymer membrane and the two gas diffusion media;    (D) a subgasket (55) positioned around a perimeter of one of the gas diffusion media, where the subgasket defines an active area inside the perimeter and having a layer of thermally activated adhesive;    (E) a bipolar plate sealed to the subgasket by the layer of thermally activated adhesive to form a gas tight seal, and having an anode side and a cathode side.    INDEPENDENT CLAIMS are included for:    (1) manufacture of integrated fuel cell assembly comprising providing a unitized electrode assembly; placing a bipolar plate on the layer of thermally activated adhesive; and heating the thermally activated adhesive to seal the bipolar plate to the unitized electrode assembly forming a gas tight seal; and    (2) a method of assembling a fuel cell stack comprising providing integrated fuel cell assemblies; stacking the integrated fuel cell assemblies so that the bipolar plate in one integrated fuel assembly is adjacent to one of the gas diffusion media of another integrated fuel cell assembly; and    (3) compressing the integrated fuel cell assemblies.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a portion of a fuel cell incorporating a unitized electrode assembly.    Membrane (25)    Cathode electrode layer (30)    Gas diffusion layer (45)    Subgasket (55)    Integrated fuel cell assembly (100)