客车用燃料电池发动机耐久性研究

Study on Durability of the Fuel Cell Power System for the Bus Application

燃料电池发动机的耐久性是目前燃料电池汽车应用的关键技术问题之一。通过对客车动力平台用燃料电池发动机在实际道路运行数据的分析,以及燃料电池单堆在实验室条件下的耐久性测试结果的对比,研究目前燃料电池发动机的耐久性。新源动力开发的燃料电池发动机在客车实际运行条件下累计达到1500h,客车行驶里程累计20000km,在常用工况点(120A)性能衰减速度45μV/h,总体衰减不到7%;另一方面,实验室条件下进行单电堆1000h动态寿命考核,电堆表现出良好的耐久性,性能衰减速度为12μV/h。通过对两项结果的对比分析,认为燃料电池发动机中支持系统能力不足是其性能下降速度相对较快的重要原因,通过对支持系统能力的优化提高,可以提升燃料电池发动机的耐久性。

The durability of fuel cell power system is one of the key problems of application of fuel cell vehicles. It is researched by analyzing the real-road running datum of the power system on the bus power-train and comparing with the results of the lab test on the durability of the single stack. The fuel cell power system developed by Sunrise Power has driven the bus for about 1 500 h with the mileage of 20 000 km. The degradation speed of fuel cell is 45 μV/h at the common operating duty （120 A）, and the total attenuation is less than 7%. The single stack is tested under the dynamic loading conditions for 1 000 h on the test-station, and the stack behaves steadily with a degradation speed of 12 μV/h. By comparing the two behaviors between the power system on bus and the stack on test-station, it is concluded that the operating conditions provided by the supporting system in the fuel cell power system is not enough to promise good durability of the stack. And the durability can be improved by optimizing the capability of the supporting system.