Abstract: The invention provides a power management method for a hybrid power supply, comprising providing a primary power source, providing a rechargeable battery, providing a DC-DC converter, acquiring an amount of the power stored in the rechargeable battery, and when the energy level of the rechargeable battery does not exceed a first predetermined value, the DC-DC converter controls the primary power source to output a first value of a first electrical parameter.

Abstract: A power supply device comprises a secondary cell group and a fuel cell group. The secondary cell group has an operative voltage range and may receive a voltage converted from a voltage converter that coupled to the fuel cell group. The fuel cell group is characterized with a maximum output power and a corresponding voltage. The corresponding voltage is not higher than the upper limit of the operative voltage range.

Abstract: A connecting structure of a flat fuel cell assembly. The assembly includes a plurality of fuel cells, each of which has a membrane electrode assembly with an anode, a proton exchange membrane and a cathode combined. Two conductive nets are attached to the surfaces of the anode and the cathode of each membrane electrode assembly by thermosetting adhesive and heat pressing to collect and transmit electrons.

Abstract: A flat fuel cell assembly for producing electric power. The flat fuel cell assembly includes an insulation frame, two anodes and two membrane cathode assemblies. The insulation frame has two openings and a connecting portion therebetween. Each of the membrane cathode assemblies consists of a cathode coated with cathode catalyst and a solid electrolyte membrane. The anodes are coated with anode catalyst. The anodes and the membrane cathode assemblies form a fuel cell unit at each opening. The fuel cell units are connected in series by a connecting electrode embedded in the connection portion, forming a flat fuel cell assembly.