質子交換膜燃料電池具有常溫下操作、快速啟動、無污染及無噪音等優點，為極具潛力的替代性能源之一。然而，目前存在著生產成本、生命週期與水管理等問題，阻礙其商業化之發展。近年來大部分的學者皆針對平板狀結構進行分析與討論，少有研究對於圓柱狀之設計加以探討，而圓柱狀之特色為可省略雙極板元件、可降低製作成本且具有高的體積與重量能量密度等，此優勢適合應用於攜帶式之電子產品。研究中透過有限元素分析氫氣的流場分佈，探討不同流量與不同出口直徑之流速分佈，更進一步了解其與電池效能之關係。利用沖孔、捲曲與引伸等金屬成形製程製作電池之上、下蓋、陽極與陰極電流收集器。電池之陰極採用空氣自然對流進氣之方式以減少一般燃料電池所需之配備。將製作之圓柱狀電池進行不同參數之分析，了解其極化曲線與功率密度的變化，實驗中的參數包括氫氣流量、氫氣溫度、陰極鎖合力、出口直徑、氫氣入口與重力場之夾角等。探討各種參數對電池效能的影響，並找出最佳效能之參數。
研究中所發展之小型圓柱狀電池在室溫下之最大功率密度可達112.8 mW/cm2。在各種不同參數下，得知陰極鎖合力與氫氣溫度對電池效能之影響最大，而出口直徑之變化幾乎完全不影響效能。而在實驗中之最佳參數條件下，可達最大功率密度158.7 mW/cm2。最大功率重量比為107.1 W/kg，最大功率體積比為122.4 mW/ cm3。

Proton exchange membrane fuel cells (PEMFCs) are more and more widely used because of the advantages such as zero emission, low temperature operation and relatively high efficiency. However, the widespread commercialization of PEMFCs remains challenge due to cost, reliability and water management issues. PEMFCs can be divided into planar type and cylindrical type according to the structures. Most previous studies have focused on development and analysis the planar one. Bipolar plates contribute significantly to the high cost and low power density in the planar type. However, these two issues can be improved in the cylindrical type due to elimination of bipolar plates. This study develops a lightweight cylindrical PEMFC cell with free air-breathing for portable electronic device. A computational fluid dynamics (CFD) model is created to analyze the velocity and pressure distribution of anode field. Metal forming processes including deep drawing, piercing and rolling are used to fabricate caps, cathode current collector and anode current collector. The influence of several parameters, clamping force, gravity, flow rate, operation temperature and convection on the performance of fuel cell is discussed. The results show that the clamping force and the operation temperature have significantly influence the performance of fuel cell. Maximum power density of the developed fuel cell is 158.7 mW/cm2. Moreover, maximum gravimetric power density and maximum volumetric power density are 107.1 W/kg and 122.4 mW/ cm3, respectively.

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