The background of this study is the problem of thermal runaway in the battery cells of electric vehicles. Increasingly powerful and compact battery packs require highly efficient thermal management. One potential solution is the direct liquid cooling of lithium-ion battery cells using a dielectric liquid which boils over a safety limit temperature. This approach intends to prevent in a first step the cell thermal runaway and if it fails in a second step its propagation to its neighbors: the liquid boiling helps to mitigate the cell temperature rise and to transport and spread the heat. The arrangement of the cells in the pack and their close spacing induce a scientific problem of convective boiling in a mini-channel. To enhance designs using this solution, a comprehensive understanding of flow boiling and a precise local heat transfer quantification is essential. The HFE-7100 has been selected as a working fluid for its attractive thermophysical properties and a suitable saturation temperature.

中文翻译：

---

过冷度和压力对垂直微通道内流动沸腾的影响：逆向法传热分析

本研究的背景是电动汽车电池的热失控问题。日益强大且紧凑的电池组需要高效的热管理。一种潜在的解决方案是使用沸腾超过安全极限温度的介电液体对锂离子电池进行直接液体冷却。这种方法旨在第一步防止电池热失控，如果在第二步失败，则其传播到其邻居：液体沸腾有助于减轻电池温度上升并传输和扩散热量。电池组中电池的排列及其紧密的间距引发了微通道中对流沸腾的科学问题。为了使用该解决方案增强设计，必须全面了解流动沸腾和精确的局部传热量化。 HFE-7100 因其有吸引力的热物理特性和合适的饱和温度而被选为工作流体。