金属氢化物储氢技术因其高效储氢的潜力成为研究热点，由于金属氢化物吸氢反应具有放热特性，热管理成为影响装置性能的关键因素。系统研究了固态储氢装置中轴向传热与吸氢动力学的耦合特性,以金属氢化物LaNi5为研究对象,探讨其在储氢过程中的热传递与质量传递行为。构建了储氢装置仿真模型,通过多相传热传质的数值模拟开展仿真研究。研究揭示了储氢过程中温度场与吸氢量的时空演化规律:反应初期放热效应显著,中心区域温升快，吸氢速率达峰值;过渡阶段热传导及冷却作用缩小高温区范围,吸氢速率逐步衰减;稳定阶段装置系统趋于热力学平衡。结果表明,轴向热传导效率与氢气扩散阻力共同调控储氢性能,底部吸氢速率最优,顶部吸氢速率受扩散限制显著。研究结果阐明了轴向传热与吸氢动力学的交互机制,可延伸应用于固态储氢装置的热管理。

Metal hydride hydrogen storage has emerged as a prominent research focus due to its potential for highly efficient hydrogen energy storage. The exothermic nature of hydrogen absorption reactions in metal hydrides renders thermal management a critical factor in determining system performance. This study systematically investigates the coupled characteristics of axial heat transfer and hydrogen absorption kinetics in a solid-state hydrogen storage devices, using LaNi5 as the representative material to explore the interplay between heat and mass transfer during hydrogen uptake. A simulation model of the storage device was developed, and numerical simulations were conducted based on a multiphase heat and mass transfer framework. The results reveal the spatio temporal evolution patterns of temperature fields and hydrogen uptake: in the initial reaction phase, pronounced exothermic effects lead to rapid temperature rise in the central region and yield peak hydrogen absorption rates; during the transition phase, heat conduction and cooling reduce the high-temperature zones, with a gradual decline in absorption rates; in the steady-state phase, the device system approaches thermodynamic equilibrium. The findings indicate that axial heat transfer efficiency and hydrogen diffusion resistance jointly govern storage performance, with optimal absorption rates observed at the base and significant diffusion limitations occurring at the top. The research findings clarify the interaction mechanism between heat axial heat transfer and hydrogen absorption kinetics, providing a foundation for the further development and application of thermal management strategies in solid-state hydrogen storage devices.