Patent ID: 6767661
Filing Date: 2004-07-27
Classification: H01M,Y02E

Abstract:
A fuel cell system comprising:a phosphoric acid fuel cell stack including a plurality of stacked power-generating cells each having a joined unit including an electrolyte impregnated with phosphoric acid and interposed between an anode electrode and a cathode electrode, said joined unit being interposed between separators; a medium-circulating passage communicating with a medium inlet and a medium outlet of said phosphoric acid fuel cell stack, for supplying, in a circulating manner, a temperature-adjusting medium into said phosphoric acid fuel cell stack; and first and second temperature sensors for detecting medium temperatures at said medium inlet and said medium outlet, wherein said medium-circulating passage is arranged with: a pump for circulating said medium; a heater for heating said medium; a heat exchanger for cooling said medium; a bypass passage for bypassing said heat exchanger; and medium flow passage-switching means for selectively supplying said temperature-adjusting medium to said heat exchanger and said bypass passage.