A high-efficiency sodium-based high-temperature electrochemical cell comprises an outer steel housing coated with nickel, which is elongated parallelepiped in shape, a ceramic electrolyte (14) in the form of a tubular body made of β-alumina, which is in the outer Housing is used, a plurality of capillary profiles, which are formed of molded plates (16) which are arranged between the outer housing (12) and the ceramic electrolyte (14), with respect to which they hold a gap, and a current collector (18) Metal material coaxially inserted and fixed in the ceramic electrolyte (14). The current collector is formed by a tubular body defining a cavity which is at least partially filled with PCM (phase change materials) material.
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