电池堆中电压衰减最快电池的仿真和试验研究

Simulation and Experiment Investigation for Fastest Voltage Attenuation Single Cell in Vehicle Fuel Cell Stack

为研究燃料电池堆中衰减最快单电池的性能,提出了阳极相对湿度影响下(anode relative humidity,ARH)的模型.建立了几何模型和计算网格,并将ARH模型嵌入计算流体动力学软件进行仿真.搭建了一个燃料电池堆测试系统并进行测试.对仿真结果和试验结果进行对比.结果表明:在试验条件下,距离进气口最远的单电池电压衰减最快,性能最差;相比Fluent原模型,ARH模型预测下的极化曲线能更好地与试验结果吻合,当相对湿度为100%时,ARH模型计算值与试验值误差降到3%,比Fluent模型能更精确地预测试验结果.

In order to study the fastest voltage attenuation single cell in vehicle fuel cell stack,an anode relative humidity(ARH)model is proposed. First, the geometric model and computational grids are established based on real fuel cell structure, and the ARH model is embedded into the computational fluid dynamics software for calculation.Next,a fuel cell test system is constructed and a test is conducted.Finally,the simulation results are compared with the experiment results.The results show that C10(the single cell which is farthest from the gas inlet)voltage attenuation is the fastest and its performance is the poorest.Compared with the Fluent original model,polarization curves predicted by the ARH model show a better agreement with the experimental results.The calculation error between the ARH model and the experiment is up to 3% at a relative humidity of 100%,and the ARH model can predict the experiment results more accurately compared with the Fluent model.