NOVELTY - Fabrication of electrochemical energy converter involves covering both sides of central ceramic plate (1) featuring high density and rigidity with cermet composition (2A, 2B); then overlaying both sides of ceramic structure made in such a way with conductive structures (5A, 5B) with subsequent layers of cermet composition (6A, 6B) containing nickel, then, subsequently overlaying both sides of ceramic structure prepared in such a way with layers constituting solid electrolyte (7A, 7B).    USE - For fabrication of the electrochemical energy converter (claimed), for production of hydrogen.    ADVANTAGE - The method enables easy connection of cells into batteries; achieves a high degree of compactness, which in turn makes a favorable ratio of power to volume possible. Connections designed for the fuel pathways, which are remote from the high temperature zone, as well as the remote electric connections, can operate at temperatures well below the cell operation temperature. Thanks to this, the processes of degradation of the fuel transfer connections and electrical connections have been minimized, which should result in prolonged time of operation. The relatively low temperature in the vicinity of connections for the fuel pathways makes it possible to use low-melting metal sealing or cheap polymer seals. The connections made with low-melting binders can be disassembled relatively easily. This makes it possible to disconnect a selected cell, and hence to repair the battery.    DETAILED DESCRIPTION - Fabrication of electrochemical energy converter involves covering both sides of central ceramic plate (1) featuring high density and rigidity with cermet composition (2A, 2B), in which, on both sides of the plate, channels (3A, 3B) are made, then covering the channels on both sides of the plate with cermet composition layers containing nickel (4A, 4B), which are next fired in such a way, that analogous ceramic layers on both sides are fired simultaneously; then overlaying both sides of the ceramic structure made in such a way with conductive structures (5A, 5B) and afterwards with subsequent layers of the cermet composition (6A, 6B) containing nickel, then, subsequently overlaying both sides of the ceramic structure prepared in such a way with layers constituting the solid electrolyte (7A, 7B), layers which are transparent for gases and conduct electric current, constituting electrodes (8A, 8B) and contact layers (9A, 9B) and connecting afterwards electrical outputs are connected to the contact layers. The electrochemical energy converter has metallic structures buried inside porous cermet layers (AN1, AN2). The buried metallic structures are made of platinum layers, transparent for gases, or nickel nanotubes or nickel meshes. An INDEPENDENT CLAIM is included for electrochemical energy converter, containing solid electrolyte, where it has a flat ceramic base whose core is constituted by the central ceramic plate featuring high density and rigidity which is permanently bonded to porous cermet layers, in which the distribution channels have been made, the ceramic base made in such a way has on both sides on a part of the surface ceramic layers of solid electrolyte, which have been applied and permanently combined with the base, and which on a part of their surface are covered with electrode layers, which in turn are covered with contact layers on a part of their surface.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of electrochemical energy converter.    Central ceramic plate (1)    Fuel distribution channels (3A, 3B)    Solid electrolyte (7A, 7B)    Electrode layers (8A, 8B)    Contact layers (9A, 9B)