A fuel cell stack and a method of operating the same

A plurality of fuel cells (12) are stacked together. Current collectors (14a, 14b) are stacked on the fuel cells (12) at opposite ends in a stacking direction of said fuel cells (12), and heating members (16a, 16b) are stacked on the outside of said current collectors (14a, 14b). In a normal operating condition, electricity is delivered through the current collectors (14a, 14b). When the temperature of end cells (12a, 12b) is lowered, a switching operation is performed to stop delivering electricity through the current collectors (14a, 14b) and start delivering electricity through the heating members (16a, 16b).