(US4913706-A)      Producing an electrochemical cell assembly having gas porous plates with electrically and thermally conductiVe particles joined together leaving a void between them and being joined to give an electrically and thermally integral structure is provided. A region of the structure blocks the flow of reactant gas and electrolyte.    The plates are formed and an intermediate layer is disposed between them which comprises binder and thermally conductive particle mix. The three are binded together electrically at a temp. and press. which forces binder through the plate boundaries voids. The plates and layer between are cooled to a temp. which prevents their sepn. while applying press. such that the conc. of particles in the binder in the intermediate layer after cooling is at least twice that initially provided.    ADVANTAGE -   Good gas impermeability is provided. @(12pp)@    (US4929517-A)      Electrochemical cell assembly includes 2 adjacent gas porous plates having electrically and thermally conductive particles joined together leaving a void structure between them. Plates are joined together to form an integral structure that is electrically and thermally conductive, contg. a region that blocks flow of gas and electrolyte.    Assembly comprises (a) a first porous plate having a boundary formed by electrically and thermally conductive particles joined to form void structure, and having a first surface; (b) a second porous plate having a boundary similarly formed with a second surface spaced apart from that of (a), to leave a region between them; and (c) a binder between (a) and (b) extending through the boundary of (a), into void structure to form a first layer of particles in first plate binder, and extending through the boundary of (b) into void structure to form a second layer of particles in second plate binder.    ADVANTAGE -   Electrically and thermally conductive particles lie in the region between the plates in the binder to form a third layer of particles in the binder, whose portions are merged with boundaries of each porous plate. @(12pp)@    (JP3023117-B2)      Electrochemical cell assembly includes pairs of adjacent gas porous plates (18,20) joined to form integral structure that is electrically and thermally conductive and includes a region blocking the flow of gas and electrolyte. Both plates have electrically and thermally conductive particles which are joined together so as to leave a void structure between them, the particles defining boundaries for both plates spaced from each other by a region which is filled with binder (58). The binder extends through the boundaries of both plates into the void structures to form layers of particles in binder in both of them and electrically and thermally conductive particles are disposed in the region between the plates to form a thrid layer of particles in binder. This layer has one surface adjacent the surface on one porous plate and a second surface adjacent the surface of the second porous plate, the boundaries of both surfaces merging with the boundaries of respective plates.    USE/ADVANTAGE -   Electrochemical cell is esp. a phosphoric acid fuel cell producing power by electrochemically consuming a fuel and an oxidant The layer of binder prevents the fuel and oxidnat from mixing. The construction of plates and binder reduces the cost and complexity of the cell in mfr. and provides a structure which cannot separate.