动力锂离子电池放电热模拟分析
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摘要
动力锂离子电池放电过程中的热安全性问题是电动汽车必须解决的关键问题。通过实验得到了单体电池的内阻随SOC的关系曲线和正负极耳内阻,计算了电池沿各个方向的导热系数和放电过程中的热生成速率,建立三维电池热模型,得出电池的热分布。由1 C放电1 h后电池的热分布来分析电池的热行为,同时验证了模拟结果的准确性,并模拟了不同表面对流传热系数条件下对电池内部散热的影响。结果显示提高电池表面对流传热系数可以提高电池散热能力。
Thermal safety problem in the discharge process of lithium-ion battery is a key problem that must be solved for electric vehicles. The relationship between internal resistance of battery and SOC was built, the positive and negative pole resistance were tested through the experiment, and the heat conduction coefficients along different directions and the heat generation rate in discharge process were calculated. The battery three-dimensional thermal model was established and heat distribution data were acquired. Thermal behavior of the battery under the condition of discharging at 1 C for 1 h was analyzed based on the battery heat distribution data, and the accuracy of the simulation results was verified. The influence of heat transfer coefficient on the internal heat of the battery was simulated. The results show that improving the heat transfer coefficient of the cell surface can improve the heat dissipation capability of the battery.
Thermal safety problem in the discharge process of lithium-ion battery is a key problem that must be solved for electric vehicles. The relationship between internal resistance of battery and SOC was built, the positive and negative pole resistance were tested through the experiment, and the heat conduction coefficients along different directions and the heat generation rate in discharge process were calculated. The battery three-dimensional thermal model was established and heat distribution data were acquired. Thermal behavior of the battery under the condition of discharging at 1 C for 1 h was analyzed based on the battery heat distribution data, and the accuracy of the simulation results was verified. The influence of heat transfer coefficient on the internal heat of the battery was simulated. The results show that improving the heat transfer coefficient of the cell surface can improve the heat dissipation capability of the battery.
引文
[1]梁金华,李建秋,卢兰光,等.纯电动车电池组散热必要性的初步分析[J].汽车工程,2012(34):589-592.
[2]KUMARESAN K.Thermal model for a Li-ion cell[J].Journal of Electrochemical Society,2007,155(2):164-168.
[3]CHEN S C,WAN C C,WANG Y Y.Thermal analysis of lithium-ion batteries[J].Journal of Power Sources,2005,195(9):111-124.
[4]吴斌.电动汽车电池温度场之分析与应用[D].哈尔滨:哈尔滨工业大学,2011.
[5]BERNARDI D,PAWLIKOWSKI E,NEWMAN J.A general energy balance for battery system[J].Journal of Electrochemical Society,1985,132(1):5-12.
[6]林成涛,李腾,陈全世.锰酸锂动力蓄电池散热影响因素分析[J].兵工学报,2010(1):89-93.
[7]许国良,王晓墨,邬田华,等.工程传热学[M].北京:中国电力出版社,2006.
[2]KUMARESAN K.Thermal model for a Li-ion cell[J].Journal of Electrochemical Society,2007,155(2):164-168.
[3]CHEN S C,WAN C C,WANG Y Y.Thermal analysis of lithium-ion batteries[J].Journal of Power Sources,2005,195(9):111-124.
[4]吴斌.电动汽车电池温度场之分析与应用[D].哈尔滨:哈尔滨工业大学,2011.
[5]BERNARDI D,PAWLIKOWSKI E,NEWMAN J.A general energy balance for battery system[J].Journal of Electrochemical Society,1985,132(1):5-12.
[6]林成涛,李腾,陈全世.锰酸锂动力蓄电池散热影响因素分析[J].兵工学报,2010(1):89-93.
[7]许国良,王晓墨,邬田华,等.工程传热学[M].北京:中国电力出版社,2006.