关键词: 燃料电池电堆；寿命；耐久试验

Abstract: To investigate the effect of vehicle operating conditions on the lifetime of fuel cell stacks, this paper analyzes the correlation between vehicle operating conditions and key factors affecting stack durability, and clarifies the degradation mechanisms of these key factors. Taking fuel cell stacks for passenger cars and heavy-duty trucks as objects, durability studies are conducted through tests in three dimensions: operating cycle, -30 ℃ cold start, and air-to-air start-stop, with indicators such as average single-cell voltage being set. The results show that the operating cycle for passenger cars has a more significant impact on stack degradation, with an average single-cell voltage decay rate of 7 μV/h, which is about 3.5 times that of heavy-duty trucks. Among the three dimensions, the operating cycle contributes the most to stack degradation for both passenger cars and heavy-duty trucks, with degradation values of 16% and 6.1%, accounting for 87.9% and 73.5%, respectively.Therefore, when designing and selecting fuel cell stacks for durability, the effect of the operating cycle on lifetime should be considered first, followed by the effects of sub-zero cold start and air-to-air start-stop. This study provides practical guidance for automotive engineering applications

Key words: uel cell stack; lifetime; durability test