中文摘要：

提出了一种解决燃料电池系统低温启动的策略，将氢气和空气预混合气体在燃料电池外部进行催化燃烧，然后将燃烧后的尾气通入燃料电池阴极流场和水流场以加热燃料电池系统．基于此低温启动策略，搭建了低温启动试验平台，研究了反应物混合气流量、氢气体积分数等参数对燃料电池低温启动过程的影响．试验结果表明：增大反应物混合气流量或增加氢气体积分数均能缩短低温启动时间；当流量为3L·min^-1，氢气体积分数为5％时，电池内部温度在540S内上升到冰点以上温度，可以初步满足低温启动的要求．

英文摘要：

A novel low-temperature start-up strategy was put forward to solve the low-temperature start-up problems for the proton exchange membrane fuel cell system. In this strategy, the hydrogen and air premixed gas was first catalytic combusted outside of the fuel cell, and then the combustion exhaust gas was put into the fuel cell cathode flow field and the water flow field. An experimental platform based on the start-up strategy was built, and the influence of the reactant flow rate, hydrogen concentration and other conditions on the fuel cell low-temperature start-up process was investigated. The results show that the increase in the reactant flow rate or the hydrogen concentration can shorten the start-up time. With a flow rate of 3 L · min-1 and a hydrogen volume concentration of 5%, the cell internal temperature can rise from --10 ℃ to freezing temperatures within 540 s.