雪花拓扑极板质子交换膜燃料电池性能优化

Performance Optimization of Proton Exchange Membrane Fuel Cell With Snow-flake Topological Plate

质子交换膜燃料电池双极板最优流型是提高电池性能的关键,好的流场设计能促使反应气体向扩散层快速扩散和液态水的有效移除。本文提出仿雪花状新型流场设计,能同时兼顾肺部仿生和叶片仿生生物流道的优点。采用三维稳态常温单相质子交换膜燃料电池模型对比分析仿雪花状流场和传统双蛇形流场电池的性能,对比两种流道电池的极化曲线、功率密度曲线以及局部燃料、生成物组分浓度、电流密度分布等。结果表明,在相同运行工况情况下,仿雪花状流场质子交换膜燃料电池比传统双蛇形流场,可以极大降低整体压降,提高反应物均匀性,峰值功率是传统双蛇形流场的1.45倍。仿雪花状流道对燃料气体质量输运、微通道液态水管理、整体压降等方面具有非常明显优势,有望成为燃料电池新型流场设计的有益补充。

The flow field plates play significant roles in the performance of proton exchange membrane fuel cells(PEMFCs).A good flow field design is not only able to facilitate the fast diffusion of reaction gas to the diffusion layer,but also effectively remove the generated liquid water from the triple-phase boundaries.In this work,we proposed a new snow-flake topological flow field(SFTFF)design,which is inspired by both the Lung-shape bionic flow field and Leaves-shape bionic flow field.The three-dimensional steady-state single-phase proton exchange membrane fuel cell model was used to analyze the performance of this new design.We compared the performance of snow-flake topological plate design with that of the traditional double serpentine flow field(DSFF)one.With the same operating conditions,the total pressure drops of PEMFCs with snow-flake topological plate can be greatly reduced.Such design can also disperse the reactant gas uniformly.The peak power of the PEMFC is 1.45 times larger than that of the traditional double serpentine design.The snow-flake topological plate design provide an option for the fuel gas mass transportation,water management and pressure drop contral for the PEMFCs.