Fuel cell system for direct electrochemical conversion of chemical fuel energy into electric energy comprises (a) a hydrogen absorbing alloy supplying a hydrogen gas to the anode during steady-state operation of the system; and (b) an auxiliary alloy as above having a higher H2 absorbing/desorbing equilibrium pressure at an equal pressure. The auxiliary alloy receives H2 from the main alloy during steady-state operation when the equilibrium pressure of the main alloy becomes equal to the absorbing/desorbing equilibrium pressure of the auxiliary alloy.    USE/ADVANTAGE -   To supply a smooth flow of the H2 to a fuel cell. Ensures a smooth H2 supply from the start of operation to when an exhaust heat has a low temp.. The system is mfd. at low cost and avoids use of an external gas source, so improving safety. The pressure container of the main alloy is compact. Power is generated smoothly during replacement of the hydrogen absorbing alloys. (First major country equivalent to J05047400-A)    (US5366820-A)      Fuel cell system for direct electrochemical conversion of chemical fuel energy into electric energy comprises (a) a hydrogen absorbing alloy supplying a hydrogen gas to the anode during steady-state operation of the system; and (b) an auxiliary alloy as above having a higher H2 absorbing/desorbing equilibrium pressure at an equal pressure. The auxiliary alloy receives H2 from the main alloy during steady-state operation when the equilibrium pressure of the main alloy becomes equal to the absorbing/desorbing equilibrium pressure of the auxiliary alloy.    USE/ADVANTAGE -   To supply a smooth flow of the H2 to a fuel cell. Ensures a smooth H2 supply from the start of operation to when an exhaust heat has a low temp.. The system is mfd. at low cost and avoids use of an external gas source, so improving safety. The pressure container of the main alloy is compact. Power is generated smoothly during replacement of the hydrogen absorbing alloys. (First major country equivalent to J05047400-A)    (JP2989332-B2)      Fuel cell system for direct electrochemical conversion of chemical fuel energy into electric energy comprises (a) a hydrogen absorbing alloy supplying a hydrogen gas to the anode during steady-state operation of the system; and (b) an auxiliary alloy as above having a higher H2 absorbing/desorbing equilibrium pressure at an equal pressure. The auxiliary alloy receives H2 from the main alloy during steady-state operation when the equilibrium pressure of the main alloy becomes equal to the absorbing/desorbing equilibrium pressure of the auxiliary alloy.    USE/ADVANTAGE -   To supply a smooth flow of the H2 to a fuel cell. Ensures a smooth H2 supply from the start of operation to when an exhaust heat has a low temp.. The system is mfd. at low cost and avoids use of an external gas source, so improving safety. The pressure container of the main alloy is compact. Power is generated smoothly during replacement of the hydrogen absorbing alloys. (First major country equivalent to J05047400-A)