微乳液脉动热管应用于锂离子电池的散热性能

doi:10.16085/j.issn.1000-6613.2022-0809

摘要/Abstract

摘要：

利用11弯管的脉动热管作为汽车锂离子电池的散热系统进行传热实验。在脉动热管中引入不同比例的混合工质[H₂O、全氟丁基甲基醚（HFE-7100）]，在模拟单体锂离子电池不同发热功率下展开传热实验，实验结果表明，微乳液工质可以有效避免高发热功率下脉动热管出现局部烧干的现象，防止电池表面温度过高发生热失控。使用水包油（O/W）型微乳液工质（0.048%SDBS∶HFE-7100=1∶1）时传热性能最理想，并且可以保证锂离子单体电池正常工作（20～30W）时，温度不超过40℃，表面温差低于1.8℃，在单体电池高发热功率（40～50W）时，电池局部温度不超过56℃，电池表面的平均温度不超过55℃。

关键词: 脉动热管, 表面活性剂, 混合工质, 乳液, 传热性能

Abstract:

The oscillating heat pipe (OHP) with 11 bends was employed to the heat dissipation system of the lithium-ion battery. Different proportions of hybrid fluids (H₂O and HFE-7100) were introduced into the oscillating heat pipe, and the heat transfer experiment was carried out at different heating loads to simulate a lithium-ion battery. The experimental results showed that micro-emulsion can effectively avoid the occurrences of partial drying at high heating loads and prevent thermal control due to the high temperature of the battery surface. Best heat transfer performance was obtained at oil in water (O/W) type micro-emulsion (0.048%SDBS∶HFE-7100=1∶1) and could ensure the normal operation of lithium-ion monomer battery (20—30W), and the temperature did not exceed 40℃ and the surface temperature difference was less than 1.8℃. With the high heating loads of the monomer battery (40—50W), the local temperature of the battery was below 56℃ and the average temperature of the battery surface was below 55℃.

Key words: oscillating heat pipe, surfactant solution, hybrid fluids, emulsion, heat transfer performance

中图分类号:

TK172.4

高婷婷, 蒋振, 吴晓毅, 郝婷婷, 马学虎, 温荣福. 微乳液脉动热管应用于锂离子电池的散热性能[J]. 化工进展, 2023, 42(3): 1167-1177.

GAO Tingting, JIANG Zhen, WU Xiaoyi, HAO Tingting, MA Xuehu, WEN Rongfu. Experimental investigation on lithium-ion battery heat dissipation performance of oscillating heat pipe with micro-nano emulsion[J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1167-1177.

图/表 11

图1 紫铜板式脉动热管系统

表1 HFE-7100和0.048%SDBS水溶液的物性参数[27-30]

物性	HFE-7100	0.048%SDBS水溶液
沸点/℃	61	100
熔点/℃	-135	0
蒸汽压力/mmHg	202（25℃）	760（100℃）
密度/kg·m^-3	1520	1000
比热容/J·kg^-1·K^-1	1172	4125
表面张力/mN·m^-1	13.6	33.3
潜热/kJ·kg^-1	126	2256.7
黏度/Pa·s	6.383×10^-4（20℃）	1.05×10^-3（20℃）

图2 SDBS水溶液表面张力

图3 非共沸不互溶混合工质的混合实物

图4 0.048%SDBS∶HFE-7100=1∶1水包油微滴显微镜照片

图5 0.048%SDBS∶HFE-7100=1∶1水包油微滴粒径分布

图6 SDBS水溶液和HFE-7100在脉动热管中液滴形成示意图

图7 脉动热管热阻比较

图8 不同比例混合工质下脉动热管的壁温随加热功率的变化

图9 不同比例混合工质下平均壁温和温差随发热功率的变化

图10 壁温随发热功率的变化对比

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