為追求更好的燃料電池封裝方式，本論文主要探討：(1)銀環在固態氧化物燃料電池高溫時氣密封裝之設計；(2)超彈性Ni-Ti合金低溫時做為集電座封裝元件之設計。
一般文獻在封裝材料上運用玻璃、玻璃陶瓷或金屬合金材質作為封裝元件，封裝設計則以固定方式緊貼在雙極板上，當有洩漏發生時維修拆卸不易。本論文之設計概念是利用直徑1.2mm的銀環及電解質固定座之設計做為封裝主要零件。由於銀的熱膨脹係數高及導電性佳與可拆式之電解質固定座互相配合後，再利用陶瓷導引柱控制上下固定座，使銀環不偏離V型槽，當溫度提高時銀環在電解質固定座V型溝槽內有三個面緊貼著固定座，可達到洩漏率降低之目的。
本論文之氣密測試實驗為在電解質左右兩側各有一個銀環，並將銀環置入在電解質固定座V型溝槽內，電解質固定座與單顆電池固定板材質為SUS310；實驗方式為在常溫25℃、500℃、600℃、700℃、800℃下通入250cc/min氣體，各種溫度連續4小時並且量測其洩漏率。由於銀環的熱膨脹係數高，當溫度提昇時電解質固定座會與銀環互相擠壓，洩漏率由9.6%(25℃)降至2.4%(800℃)。循環測試則是將操作溫度由常溫25℃升溫至800℃(兩小時)為第一次循環，再將溫度降至常溫25℃後，再升溫至800℃(第二次循環)，第一次循環測試時，在溫度未提昇前，銀環與電解質及固定座間為線接觸狀態，在常溫25℃時量測的洩漏量為23~25cc/min，第二次循環時，由於經過第一次循環時的升溫，銀環已被擠壓成面接觸狀態，再次在常溫25℃下量測的洩漏量則降至10~11 cc/min。
在超彈性Ni-Ti合金低溫封裝元件之幾何設計上，為達最佳化設計，本論文利用有限元素分析K型與Y型兩種幾何模型，探討在受同樣負載下，K型與Y型兩種幾何模型之應力、位移及應變，由所得結果發現K型幾何所受之應力較小而Y型幾何之位移量則較大，再對K型與Y型兩種幾何模型進行不同角度之區域及全域靈敏度分析，根據分析結果再由兩種模型中各選擇一角度做最佳化分析，最佳化分析後K型幾何之應力值改善達到15.6%，Y型幾何之位移量則提昇25.7%。若需應力較小之封裝可以選用K型幾何，若需較大塑性變形量之封裝可以選用Y型幾何。

In order to seek a better sealing method for fuel cell, in this thesis, we have discussed (1) gas-tight design of silver ring under high temperature operation of Solid Oxide Fuel Cell; (2) shape design of superelastic Ni-Ti alloy under low temperature of electricity collection plate sealing component.
In press and paper work, glass, glass ceramic or metal alloy can usually be taken as a sealing component. The design is usually to fix the sealing component onto the interconnector. When leakage is found, it is not easy to disassembly the fuel cell for repairing. In this thesis, a silver ring with 1.2mm diameter is placed onto the electrolyte and electrolyte fixture as the sealing component. The coefficient of thermal expansion of silver is very high and the conductivity of silver is also very good, with the coordination between the silver ring and the electrolyte fixture and the ceramic guided post to control the up and down fixture, the sliver ring is well fixed onto the V shape groove. When temperature increased, a half of surface of the silver ring is fixed into the V shape groove of the electrolyte fixture and the leakage rate can be reduced.
The gas-tight test of this experiment is described as below. On the right and left side of electrolyte, two sliver rings were placed onto the V shape groove of the right and left electrolyte fixtures. The material of the fixture is SUS310. In the gas-tight test, gas was input to the chamber in a speed of 250 cc/min under five different kinds of temperature, 25℃, 500℃, 600℃, 700℃ and 800℃ for four hours and leakage rate was measured. As temperature increased, silver ring would be extruded with the electrolyte fixture. The leakage rate dropped from 9.6% (25℃) to 2.4%(800℃).
In the thermal cycle test, the temperature was raised from 25℃ to 800℃ within two hours then cooled down to 25℃ and raised again to 800℃. In the first thermal cycle, at temperature 25℃, the silver ring is in line contact condition with the fixture and the leakage volume measured is 23~25 cc/min, however, in the second thermal cycle at the same temperature of 25℃, the silver ring is in surface contact condition with the fixture and the leakage volume measured is 10~11 cc/min.
In the geometry design of superelastic Ni-Ti alloy low temperature sealing component, in order to achieve the optimized design of geometry, the finite element analysis is utilized to analyze the K type and Y type geometry design. Under the same stress load, the stress, displacement and strain were discussed. From the analysis result, we found that the stress of the K type geometry is smaller than the Y type and the displacement of the K type is bigger than the K type. We further analyzed the K type and Y type geometry in different angle of design with local and global sensitivity analysis. Based on the analysis result, we further chose one best angle design from each of the K and Y type geometry for optimization analysis. After optimization, the improvement rate of stress for K type geometry is 15.6% and the improvement rate of displacement for Y type is 25.7%. When the design of sealing component is requiring a lower stress, K type geometry can be applied and when the design is looking for a bigger deformation, Y type geometry can be applied.

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