Electrochemical cell holder and stack

A fuel cell stack made of a plurality of cell units stacked and operatively connected at one end thereof. Each of the units includes a holder (20) having at least one cell, typically provided as an SOFC membrane, to produce an electric current when fuel and oxidant are present as the result of an electrochemical reaction. The holder (20) comprises a front and a back wall plate (22,23), at least a window-like opening (21) for accommodating the electro-chemical cell (24).