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Numerical study on thermal behavior and a liquid cooling strategy for lithium‐ion battery
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-05-04 , DOI: 10.1002/er.5496 Wenjun Xu 1 , Peng Hu 1
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-05-04 , DOI: 10.1002/er.5496 Wenjun Xu 1 , Peng Hu 1
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Investigation on the thermal behavior of the lithium‐ion battery which includes the temperature response, heat contribution and generation, is of vital importance for their performance and safety. In this study, an electrochemical‐thermal cycling model is presented for a 4 Ah 21700 type cylindrical single cell and 3×3 battery pack and the model is validated by experiment on a single cell. Thermal behavior on a single cell is first analyzed, the results show that the heat generated in the charge is smaller than the discharge, and the polarization heat contributes the most to total heat, especially under higher rate. It can also be concluded from the battery pack that the temperature of the cell inside the battery pack is significantly greater than the external battery, while the temperature difference exists the opposite regular due to the worst heat dissipation of the central cell. Finally, after taking the enhanced liquid cooling strategy, the maximum temperature is 320.6 K that is reduced by 9.38%, and the maximum temperature difference is 4.9 K which is reduced by 69.6% at 2C, meeting the requirements of battery thermal management system.
中文翻译：
锂离子电池热行为和液体冷却策略的数值研究
对锂离子电池的热行为进行研究，包括温度响应，热量贡献和产生，对于其性能和安全性至关重要。在这项研究中，提出了一个4 Ah 21700型圆柱单电池和3 × 2 ×的电化学-热循环模型。3个电池组，并且该模型通过在单个电池上进行的实验进行了验证。首先分析了单个电池的热行为，结果表明，电荷中产生的热量小于放电中的热量，而极化热对总热量的贡献最大，尤其是在较高速率下。从电池组还可以得出结论，电池组内部的电池温度明显高于外部电池，而由于中央电池散热最差，温度差存在相反的规律。最后，在采取改进的液体冷却策略后，最高温度为320.6 K，降低了9.38％，最高温度差为4.9 K，在2C时降低了69.6％，满足了电池热管理系统的要求。
更新日期：2020-05-04
中文翻译：
锂离子电池热行为和液体冷却策略的数值研究
对锂离子电池的热行为进行研究，包括温度响应，热量贡献和产生，对于其性能和安全性至关重要。在这项研究中，提出了一个4 Ah 21700型圆柱单电池和3 × 2 ×的电化学-热循环模型。3个电池组，并且该模型通过在单个电池上进行的实验进行了验证。首先分析了单个电池的热行为，结果表明，电荷中产生的热量小于放电中的热量，而极化热对总热量的贡献最大，尤其是在较高速率下。从电池组还可以得出结论，电池组内部的电池温度明显高于外部电池，而由于中央电池散热最差，温度差存在相反的规律。最后，在采取改进的液体冷却策略后，最高温度为320.6 K，降低了9.38％，最高温度差为4.9 K，在2C时降低了69.6％，满足了电池热管理系统的要求。
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