Patent ID: 7604889

Claim:
A liquid fuel cell system, comprising: a liquid fuel cell unit having an insertion receiving portion; a liquid fuel cartridge that is filled with liquid fuel and has an insertion portion connectable to the insertion receiving portion of the liquid fuel cell unit, the insertion portion and the insertion receiving portion being connected together to form a fuel conduit to supply the liquid fuel from the liquid fuel cartridge to the liquid fuel cell unit; and valve units, manually operable, one of the valve units being located in the insertion portion of the liquid fuel cartridge and another of the valve units being located in the insertion receiving portion of the liquid fuel cell unit, the liquid fuel remaining unused in the liquid fuel cell unit being returned to the liquid fuel cartridge through said fuel conduit, wherein the valve units are opened through a manual operation when the liquid fuel is supplied through the fuel conduit from the liquid fuel cartridge to the liquid fuel cell unit and when the liquid fuel remaining unused in the liquid fuel cell unit is returned through the fuel conduit to the liquid fuel cartridge, and, the valve units are placed in a closed state, through a manual operation, when the liquid fuel cell unit generates power and the liquid fuel cell unit has a plurality of cells and gas permeable films, wherein cells and gas permeable films are alternately arranged on the upper surface and the lower surface of the liquid fuel cell unit that is a flat, hollow rectangular parallelepiped, the cells being supplied with the liquid fuel to generate power, and the gas permeable films discharging generated gas.