关键词: 膨胀石墨电堆；长度蠕变；铜排设计；TIPS；悬挂式母排

Abstract: The article discusses the issues with the conventional design of busbars in the expansion graphite stack fuel cell system of hydrogen fuel cell vehicles and proposes corresponding solutions. In the operation of the whole vehicle, due to factors such as air pressure, the length and size of the expanded graphite reactor have periodic changes, and in the last stage of the life cycle, the total length of the expanded graphite reactor is about 6 mm shorter than that of the factory. The problem caused by this is that the fixed point of the busbar in the main circuit of the reactor is located at both ends of the reactor, and the change of the length of the reactor will cause deformation and stress concentration of the copper bar. The article uses the theory of inventive problem solving (TIPS) to conduct an in-depth analysis of the phenomena, summarizing the problems in the current conventional copper busbar design methods for expansion graphite stacks based on possible risks and proposes a suspended busbar solution. This avoids the potential failure risks of copper busbars in the conventional design, providing a new direction for the design of busbars in similar expansion graphite stacks in the future.

Key words: Expanding graphite stacks; Slowly changing length; Copper busbar design; TIPS; Suspension copper busbar