在現有已開發的燃料電池中，固態氧化物燃料電池(SOFC)屬於高溫型的燃料電池，目前已開發的SOFC系統其電池工作溫度範圍在650-1000oC。由於平板式SOFC比管式SOFC具有較簡單的結構設計與製作成本、較高的能源效率、較低工作溫度（800oC以下）等優點，目前全世界對SOFC的研發工作，主要是以平板式SOFC為主。當SOFC系統在運轉使用時，隨著工作環境溫度的改變，由於不同組件（材質）間具有不同的熱膨脹係數值，加上工作環境溫度分佈的不均勻，因而會產生不可忽視的熱應力，使得熱應力成為開發一套高可靠度及高效能平板式SOFC必須考慮的重要因素之一。對陶瓷材料所製成的電解質與電極而言，熱應力可以促進陶瓷材料既存孔隙或缺陷成長為較大的裂縫造成組件的洩漏或破損，降低電池的效率，因此對SOFC電池堆的熱應力分析將是設計SOFC系統不可或缺的步驟。本研究計畫，將以核能所擬開發的平板式SOFC系統之電池堆為研究對象，利用有限元素分析軟體，進行熱應力數值模擬分析，並建立SOFC電池堆組件材料在工作環境溫度下機械強度試驗技術與數據量測，結合此理論分析與實驗研究成果，將可建立適用於平板式SOFC系統電池堆的最佳化設計與分析模式及測試技術，並作為核能所設計5 kW SOFC電池堆組件結構尺寸與材料選擇的依據。 Solid Oxide Fuel Cells (SOFCs) utilize a fast oxide-ion-conducting ceramic as the electrolyte and operate in the temperature range 650-1000oC such that they have the highest efficiencies of all fuel cells. As planar SOFC systems have several advantages over tubular ones such as compact size, higher energy efficiency and lower operating temperature (below 800oC), most of the current research on SOFC is being focused on the planar type. The typical materials used for anode, electrolyte, and cathode (often called a positive electrode-electrolyte-negative electrode, PEN) in SOFCs are all ceramic materials and brittle in mechanical characteristics. The high temperature operation, however, gives rise to several issues which need to be overcome. One of the most important issues is the thermal stresses caused from the mismatch of coefficient of thermal expansion and the temperature gradients developed inside the cells. When a ceramic component is held under such a prolonged thermal load (stress), pre-existent pores or defects which are subcritical, i.e. less than the critical defect size for immediate failure, can grow to failure and degrade the performance of a SOFC system during service. Therefore, a durable and reliable design with a comprehensive thermal stress analysis and mechanical characterization of related components and materials is necessary for the success of a planar SOFC system. The aim of this study is, by using a commercial finite element analysis code, to analyze the thermal stress distribution in the cell stacks of a 5 kW planar SOFC which is to be developed at INER. It is also intended to establish a mechanical testing technique and determine the high-temperature mechanical properties of the ceramic components used in this developing planar SOFC system. Based on the numerical and experimental results, an optimal analysis and design model for planar SOFC systems will be developed and applied to the 5 kW planar SOFC system of INER. 研究期間：9501 ~ 9512
