The dynamic response of proton exchange membrane fuel cells with the load switching determines the operation stability and life of fuel cells. To investigate the dynamic response of proton exchange membrane fuel cells from the perspective of gas and water delivery, the dynamic response of the fuel cell with the parallel and orientational flow channels was tested under different loads and operating conditions. The experimental results show that the dynamic performance of the fuel cell with orientational flow channels is good after the current and voltage loads are switched. The orientational flow channels improve water management, make the water distribution of the flow channels uniform, increase the membrane hydration, and prevent flooding in the local electrode. The voltage variation coefficient of the cell with orientational flow channels is 1.57%, which is smaller than that of the cell with parallel flow channels 35.6%. Thus, the dynamic performance and stability are improved. The overshoot and undershoot of pressure drop are observed which is due to the changing of gas transferring to the electrode when the load is switched. The orientational flow channels improve the gas transfer capacity, which makes more gas enter the electrode to participate in reactions, thus the orientational flow channels improve dynamic performance and decrease dynamic time constant.

质子交换膜燃料电池随负载切换的动态响应决定了燃料电池的运行稳定性和寿命。为了从气体和水输送的角度研究质子交换膜燃料电池的动态响应，测试了具有平行和定向流动通道的燃料电池在不同负载和操作条件下的动态响应。实验结果表明，电流电压负载切换后，定向流道燃料电池的动态性能良好。定向流道改善水管理，使流道的水分布均匀，增加膜水合作用，防止局部电极泛滥。具有定向流道的电池的电压变化系数为1。57%，小于平行流道电池的35.6%。因此，提高了动态性能和稳定性。观察到压降的过冲和下冲，这是由于切换负载时转移到电极的气体发生变化。定向流道提高了气体传输能力，使更多的气体进入电极参与反应，从而提高了动态性能，降低了动态时间常数。