Passive thermal management systems employing hydrogel for the large-format lithium-ion cell: A systematic study
Passive thermal management systems employing hydrogel for the large-format lithium-ion cell: A systematic study
复制标题
用于大型锂离子电池的采用水凝胶的被动热管理系统：一项系统研究
DOI：
10.1016/j.energy.2021.120946
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发表时间：
2021
期刊：
影响因子：
9
通讯作者：
Yu Bin
中科院分区：
文献类型：
--
作者：
Wu Nan;Ye Xiaolin;Li Junjie;Lin Boshen;Zhou Xuelong;Yu Bin
大型锂离子电池作为移动应用中的高能量密度电源越来越受欢迎，这需要高效、紧凑的被动热管理系统。水凝胶能够吸收和容纳大量的水，成为一种新型的散热材料。在此，我们对 20 Ah 大型锂离子电池采用水凝胶的被动热管理系统进行了系统研究，重点是调节温度均匀性和温度峰值。为了实现最佳冷却性能，设计并实验探索了四种类型的配置。结果表明，在水凝胶和电池表面之间引入导热板可以有效改善温度均匀性，即使在4C高倍率放电下，最高温度和最大温差也控制在仅40.5℃和2.5℃，比纯水凝胶体系低约2.5℃和2.3℃。此外，还采用散热片和泡沫铜来进一步加速水凝胶内的传热过程。结果表明，翅片-水凝胶系统在八个 3C/1C 放电/充电循环中保持了最佳性能，并提供了最高表面温度和 32.6 °C 和 1.4 °C 的最大温差。
The large-format lithium-ion cells are growing in popularity as high-energy-density power sources in mobile applications, which calls for efficient and compact passive thermal management systems. Hydrogel, capable of absorbing and holding extremely large amounts of water, emerges as a new type of heat sink material. Herein, we presented a systematic study on the passive thermal management systems employing hydrogel for the 20 Ah large-format lithium-ion cell with emphasis on regulating the temperature homogeneity and temperature spike. Four types of configurations were designed and experimentally explored to achieve optimal cooling performance. It showed that introducing heat conducting plate between hydrogel and battery surface can effectively improve the temperature homogeneity, and the highest temperature and largest temperature difference were controlled to be only 40.5 °C and 2.5 °C even under a high discharge rate of 4C, which were about 2.5 °C and 2.3 °C lower than the pure hydrogel system. In addition, heat dissipation fins and copper foam were also employed to further accelerate the heat transfer process within the hydrogel. It showed that the fin-hydrogel system held the best performance and delivered a maximum surface temperature and a largest temperature difference of 32.6 °C and 1.4 °C over eight 3C/1C discharge/charge cycles.