基于电化学热耦合模型的电动汽车电池模组热特性研究*

doi:10.19562/j.chinasae.qcgc.2020.05.015

摘要/Abstract

摘要： 为研究电池组的排列与布置方式对电池热特性的影响,本文中以18650锂离子电池为研究对象,建立了单体电池的电化学热力学耦合模型。利用模型仿真和实验测量获得了不同放电倍率时的电池表面温度随放电容量的变化关系,实验数据与仿真数据基本吻合,模型准确。基于单体耦合模型,分析了6×5动力电池模组的不同排列与布置方式下的热特性。结果表明:间距太小或太大均会使平均温度增加,本案例电池间距24 mm时平均温度最低;间距越大,温差越小,温度分布均匀性越好;间距一定,交叉排列散热效果优于对齐排列,且空间利用率更高。电池的排列和间距对电池散热有重要影响,锂离子动力电池组设计过程中应充分考虑。

关键词: 锂离子电池, 传热, 散热, 温度场

Abstract: In order to study the influence of the arrangement and spacing of the battery pack on the thermal characteristics of the batteries, the electrochemical thermodynamic coupling model of the single battery is established taking 18650 lithium-ion battery as the study object in this paper. The relationship between the surface temperature of the battery and the discharge capacity at different discharge rate is obtained by using the model simulation and experimental measurement, which are basically consistent and the model is accurate. Based on the coupling model, the thermal characteristics of 6×5 power battery modules in different arrangement and spacing are analyzed. The results show that too small or too large spacing will increase the average temperature, and the distance between adjacent batteries in this case is 24 mm when the average temperature is the lowest; the larger the spacing, the smaller the temperature difference, and the better the uniformity of temperature distribution; with a certain spacing, the heat dissipation effect of cross arrangement is better than that of alignment arrangement, and the space utilization ratio is higher. Therefore, the arrangement and spacing of the batteries have an important influence on the heat dissipation of the batteries, which should be fully considered in the design process of the lithium-ion power battery pack

Key words: Lithium-ion battery, heat transfer, heat dissipation, temperature field

戴海燕, 王玉兴. 基于电化学热耦合模型的电动汽车电池模组热特性研究^*[J]. 汽车工程, 2020, 42(5): 665-671.

Dai Haiyan, Wang Yuxing. Study on Thermal Characteristics of Battery Modules of Electric Vehicle Based on Electrochemical Thermal Coupling Model[J]. Automotive Engineering, 2020, 42(5): 665-671.

参考文献

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基于电化学热耦合模型的电动汽车电池模组热特性研究^*

Study on Thermal Characteristics of Battery Modules of Electric Vehicle Based on Electrochemical Thermal Coupling Model

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