Patent attributes
A fuel cell device comprising a fuel cell cartridge having a container for containing methanol mixed solution fuel and a direct methanol fuel cell on which the fuel cartridge is set the fuel cartridge being provided with a fuel injection nozzle on part of the container and a projection disposed around the fuel injection nozzle; the size of which is determined according to the concentration of methanol of the fuel in the container, and the direct methanol fuel cell being provided with a concavity, which is designed to engage with the projection of the fuel cartridge at a portion where the fuel cartridge is to be set when the concentration of methanol is proper.