直接甲醇燃料電池(Direct Methanol Fuel Cell, DMFC)使用甲醇溶液為液態燃料，為了維持DMFC穩定性與效能，常使用主動式液態幫浦將燃料輸送至DMFC中。然而幫浦所消耗的功率將影響DMFC系統的總輸出效率，因此本研究擬設計與製作出適合應用至DMFC之磁力式與隔薄膜氣液式兩款微幫浦，其中磁力式微幫浦的低操作電壓與電流，在應用至微型燃料電池充電系統，可以有效地降低系統對幫浦消耗功率的需求，進而提升整體系統的效率。隔薄膜氣液式微幫浦則可以同時帶動陽極的液體燃料與陰極的氣體，若將其應用在小型DMFC系統時，有助於系統的微型化。 此外，DMFC所使用之集電片或雙極板的材質與重量，影響了DMFC系統的體積與微型化，因此本論文擬應用微機電製程(Micro Electro Mechanical Systems, MEMS)中常見的熱蒸鍍技術(Thermo coater technique)，將FR4玻璃纖維基材表面鍍上金屬薄層，以製作出圓盤狀輕量化集電板。研究中所開發出的圓盤狀輕量化集電板具有低成本、輕量化、與設計多樣性等優點，相當適合應用至微型燃料電池。最後本論文將結合所開發出的微幫浦、圓盤狀輕量化集電板與直流升壓電路，完成一款可攜式DMFC充電系統。 Direct methanol fuel cells (DMFC) adopt a methanol solution as the liquid fuel. To maintain the stability and performance of DMFCs, an active liquid pump is typically used to supply fuel to the DMFCs. However, the power consumption of the pump affects the total efficiency of a DMFC system. Therefore, this research aims to design and fabricate both a magnetic micro pump and a diaphragm liquid/air micro pump suitable for direct use with methanol fuel cells. When applied to small DMFC charger systems, the low operation voltage and low current characteristics efficiently reduce the power consumption of the system and increase the efficiency of the entire system. The diaphragm liquid/air micro pump can drive anode liquid fuel and cathode air simultaneously. If applied to small DMFC systems, it can facilitate system miniaturization. Additionally, the material and weight of the current collector on the bipolar plates adopted in DMFCs will affect the volume and miniaturization of DMFCs. Therefore, this thesis applies the thermal coating technique, which is widely used in microelectromechanical systems (MEMS), to construct the circular lightweight current collectors by coating thin films on FR4 glass/epoxy substrate surfaces. The current collector developed in this research has the advantages of being low cost and lightweight with a flexible design, making it suitable for micro fuel cell applications. Finally, this thesis integrates the developed micro pumps, the circular light weight current collectors, and the boost circuit to construct a DMFC charge system.
