基于石蜡/月桂酸/膨胀石墨的软包锂离子电池控温性能

Temperature Control Performance of Soft-Coated Lithium-Ion Battery Based on Paraffin/Lauric Acid/Expanded Graphite

为提高锂离子电池散热安全性,基于石蜡/月桂酸/膨胀石墨制备复合相变储热材料,对电池进行强化散热,以实验和模拟结合的方式,研究不同环境和放电倍率下电池的散热特性。结果表明,0.5 C倍率下锂电池基本无需强化散热,高倍率放电下相变材料有很好的控温效果。0.8 C放电倍率下,最高温度分别下降了10.74、14.36、17.76、19.31℃;0.9 C放电倍率下,最高温度分别下降了14.31、19.06、19.59、20.92℃;1.0 C放电倍率下,最高温度分别下降了20.49、19.51、21.00、20.24℃。相变材料在相变区间内发生相变作用,仿真结果与实验结果误差均在3.5℃内,验证了电池热管理实验的准确性。

In order to improve the heat dissipation safety of lithium-ion batteries,a composite phase change thermal storage material based on paraffin/lauric acid/expanded graphite was prepared to strengthen the heat dissipation of the batteries,and the heat dissipation characteristics under different environments and discharge multipliers were studied by a combination of experiments and simulations.The results showed that the heat dissipation of lithium battery was basically not needed at 0.5 C rate,and the phase change material had a good temperature control effect at a high discharge rate.At the discharge rate of 0.8 C,the maximum temperature decreased by 10.74,14.36,17.76,and 19.31 oC respectively.At 0.9 C discharge rate,the maximum temperature decreased by 14.31,19.06,19.59,and 20.92 oC,respectively.At the discharge rate of 1.0 C,the maximum temperature decreased by 20.49,19.51,21.00,and 20.24 oC,respectively.The phase change effect of the phase change material occurred in the phase change interval,and the error between the simulation results and experimental results was within 3.5 oC,which verified the accuracy of the battery thermal management experiment.