钢带捆扎燃料电池电堆端板尺寸和形状优化

Size and Shape Optimization of the Steel Banding Fuel Cell Stack End Plate

针对捆扎式燃料电池金属双极板电堆端板受集成力作用易发生变形的现象,设计了一种钢带捆扎式燃料电池电堆的新型端板结构,并通过有限元原理和数值仿真分析对其进行结构参数优化.基于Ansys Apdl程序化语言,建立端板的结构力学分析模型.采用尺寸优化方法,以电堆多个钢带间受力均匀度高、端板质量小和单个钢带固定螺栓轴线偏移程度低为目标函数,分析端板各尺寸对上述目标函数影响程度,从而确定出优化后的尺寸和形状,改善钢带受力和电堆各个部件间接触压力的均匀性,并建立了一个11层的燃料电池电堆1/4二维模型,比较了端板优化前、后双极板脊背与膜电极(membrane electrode assembly)间接触压力分布均匀度.

The end plate of fuel cell stack with a metal bipolar plate is easily deformed under assembly pressure.A novel designed structure of the end plate was presented and its parameters was optimized by the numerical simulation based on the finite element method.A structural mechanics analysis model for the end plate was created by Ansys Apdl program and the Ansys Workbench software,and the size and shape optimization algorithm was introduced.The higher uniformity among steel bands force,less weight of end plate,and lower deviation of the fixed bolt axis are objective functions.The influence of the variable size and shape dimensions on the above objective functions was analyzed,aiming to determine the optimized size and shape of end plate,and improve the contact pressure uniformity between the components and the stress behavior of the steel banding.A2 D quarter stack model which has 11 layers to compare the contact pressure uniformity between bipolar plate and MEA(membrane electrode assembly).