Thermal performance evaluation of boiling cooling system for the high-rate large-format lithium-ion battery under coolant starvations
Thermal performance evaluation of boiling cooling system for the high-rate large-format lithium-ion battery under coolant starvations
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冷却剂匮乏情况下高倍率大型锂离子电池沸腾冷却系统热性能评估
DOI：
10.1016/j.est.2022.105616
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发表时间：
2022-11
影响因子：
9.4
通讯作者：
Zhou Xuelong
中科院分区：
文献类型：
--
作者：
Wu Nan;Chen Yisheng;Lin Boshen;Li Junjie;Zhou Xuelong
沸腾冷却系统具有上级冷却能力和温度均匀化能力，在控制大型锂离子电池的温度尖峰和温度梯度方面具有巨大潜力。然而，深入的实验研究，以揭示苛刻的操作条件和参数对冷却特性的影响仍然缺乏。在这项研究中，使用Novec 7000作为冷却剂的沸腾冷却系统的热控制能力进行了评估，为大型20-Ah锂离子电池，特别注意在苛刻的操作条件下的冷却性能，如高倍率循环和冷却剂饥饿。实验结果表明，采用不间断/小流量冷却剂的沸腾冷却系统具有上级冷却能力，在高倍率循环中电池温度可控制在35 ± 2 °C左右。然而，当在静态模式下发生冷却剂不足问题时，在第四放电过程中，最大温度和温差急剧上升至53.45 °C和18.56 °C，这异常地高于没有注入液体冷却剂的系统。20 PPI泡沫铜填料的加入在一定程度上缓解了电池的缺液问题，在相同条件下，电池温度峰值和温差峰值分别降低了13.28%和39.33%。
The boiling cooling system exhibits superior cooling capacity and temperature homogenization ability, which has great potential in managing the undesirable temperature spike and temperature gradient of the large-format lithium-ion batteries. However, in-depth experimental investigation to reveal the effects of harsh operation conditions and parameters on the cooling characteristics are still lacking. In this study, thermal control ability of the boiling cooling system using Novec 7000 as coolant is evaluated for a large-format 20-Ah lithium-ion battery, with special attentions to the cooling performance under harsh operation conditions such as high-rate cyclic and coolant starvation. The experimental results show that the boiling-cooling system with uninterrupted/small coolant flow exhibits superior cooling capacity and the battery temperature can be controlled around 35 ± 2 °C over the high-rate cycles. However, when the coolant starvation issue occurs in the static mode, the maximum temperature and temperature difference rise drastically up to 53.45 °C and 18.56 °C in the fourth discharge process, which are abnormally higher than the system without injecting liquid coolant. The incorporation of 20PPI copper foam filler can alleviate the coolant starvation issue to some extent, which reduces the peak values of battery temperature and temperature difference by 13.28 % and 39.33 % under the same condition.
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