NOVELTY - A fuel cell power plant comprises fuel cells arranged in stack, cooler plates, elastomeric rubber sealant material, and manifold structure. The fuel cell has dimensions in width and height equal to width and height dimensions of the other fuel cells in the stack, thus edges of fuel cells combine to form planar surfaces. The cooler plate has cooler inlet and outlet channels, and cooler flow channels extending between inlet and outlet channels.    USE - For providing electric power to electric vehicles.    ADVANTAGE - The plant prevents coolant from entering fuel cells along the edges, thus preventing the fuel cells from being poisoned by the coolant.    DETAILED DESCRIPTION - A fuel cell power plant comprises fuel cells (7) arranged in stack, cooler plates (9), elastomeric rubber sealant material (35, 36), and manifold structure (27, 28). The fuel cell has dimensions in width and height equal to the width and height dimensions of the other fuel cells in the stack, thus the edges of the fuel cells combine to form planar surfaces. The cooler plate has cooler inlet and outlet channels, and cooler flow channels extending between the inlet and outlet channels. The cooler plates are between at least some of the fuel cells. The cooler plates have principal width and height dimensions the same as that of the fuel cells. Each cooler plate has protrusion (13) containing the coolant inlet channels, and protrusion containing the coolant inlet channels and protrusion containing coolant outlet channels. The protrusions extend from the edges of the cooler plates, thus extending away from the plane. The elastomeric rubber sealant material surrounds each protrusion and extends between each protrusions and protrusions adjacent to one protrusion. The elastomeric sealant material extends on the side of the protrusions and extends around the plane to form sealing surface. The manifold structure contacts the sealant material and defines coolant manifolds. The manifold structure define between itself and sealant material. An antifreeze coolant inlet manifold is in fluid connection with inlet channels or antifreeze coolant outlet manifold channels (20). The manifold structure also defines a reactant gas inlet or outlet manifolds between itself and sealant material.    An INDEPENDENT CLAIM is included for manifold structure comprising first and second chambers.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective view of a fuel cell stack.    Fuel cells (7)    Cooler plates (9)    Protrusion (13)    Coolant outlet manifold channels (20)    Reactant gas manifold (21)    Manifold structure (27, 28)    Sealant material (35, 36)