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Experimental study on temperature difference between the interior and surface of Li[Ni1/3Co1/3Mn1/3]O2 prismatic lithium-ion batteries at natural convection and adiabatic condition
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2021-02-20 , DOI: 10.1016/j.applthermaleng.2021.116746
Xiaolong Yang , Xiaolin Gao , Futao Zhang , Wei Luo , Yongkang Duan

The internal temperature of the battery is important for the design of battery thermal management and battery safety; however, it is difficult to be tested and seldom studied. A method of embedding thermocouples inside a prismatic Li[Ni1/3Co1/3Mn1/3]O2 (NCM) lithium-ion battery was developed to study the temperature inconsistency between the battery interior and the surface. Six thermocouples were embedded in the interior and six were attached to the surface of the battery. First, the feasibility of the embedding-thermocouples method was verified by comparing the capacity, resistance, temperature etc. between the batteries with and without embedded thermocouples. Then 1C and 2C charging and discharging experiments were carried out under the adiabatic condition in an Accelerating Rate Calorimeter (ARC). 1C−5C rates of charging and discharging experiments were executed under the natural convection condition. The temporal and spatial temperature varieties of battery interior and surface were analyzed. The experimental results show that under the adiabatic condition, the temperature difference (TD) between the interior and surface of the battery was small, only 1.7 °C at 1C discharge rate and 3.1 °C at 2C discharge rate. However, under the natural convection condition, the maximum TD reached 11.3 °C at 5C discharge rate. The TD among the six internal temperature measurement points was small for all cases, which means a good uniform temperature distribution inside the battery. In addition, through experiment-data analysis, a near linear relationship was found for the battery internal and external temperature. The effect of the current rates on the maximum temperature and the maximum temperature difference was also studied. The results showed that a good quadratic function relationship was observed for both the maximum temperature and the maximum TD.



中文翻译:

内外表面温差的实验研究。 李[1个/3有限公司1个/31个/3] O2个 自然对流和绝热条件下的方形锂离子电池

电池的内部温度对于电池热管理和电池安全性的设计很重要。但是,它很难被测试并且很少被研究。一种将热电偶嵌入棱柱形内部的方法大号一世[ñ一世1个/3CØ1个/3中号ñ1个/3]Ø2个(NCM)锂离子电池是为了研究电池内部和表面之间的温度不一致而开发的。六个热电偶嵌入内部,六个附着在电池表面。首先,通过比较带嵌入式热电偶和不带嵌入式热电偶的电池之间的容量,电阻,温度等,验证了嵌入热电偶方法的可行性。然后,在绝热条件下,在加速量热仪(ARC)中进行了1C和2C的充放电实验。在自然对流条件下进行了1C-5C的充放电速率实验。分析了电池内部和表面的时空温度变化。实验结果表明,在绝热条件下,电池内部和表面之间的温差(TD)小,在1C放电速率下仅为1.7°C,在2C放电速率下仅为3.1°C。但是,在自然对流条件下,放电速率为5C时,最大TD达到11.3°C。在所有情况下,六个内部温度测量点中的TD都很小,这意味着电池内部的温度分布良好。此外,通过实验数据分析,发现电池内部和外部温度之间存在近似线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。1C放电速率下仅1.7°C,2C放电速率下仅3.1°C。但是,在自然对流条件下,放电速率为5C时,最大TD达到11.3°C。在所有情况下,六个内部温度测量点中的TD都很小,这意味着电池内部的温度分布良好。此外,通过实验数据分析,发现电池内部和外部温度之间存在近似线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。1C放电速率下仅1.7°C,2C放电速率下仅3.1°C。但是,在自然对流条件下,放电速率为5C时,最大TD达到11.3°C。在所有情况下,六个内部温度测量点中的TD都很小,这意味着电池内部的温度分布良好。此外,通过实验数据分析,发现电池内部和外部温度之间存在近似线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。放电速率为5C时为3°C。在所有情况下,六个内部温度测量点中的TD都很小,这意味着电池内部的温度分布良好。此外,通过实验数据分析,发现电池内部和外部温度之间存在近似线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。放电速率为5C时为3°C。在所有情况下,六个内部温度测量点中的TD都很小,这意味着电池内部的温度分布良好。此外,通过实验数据分析,发现电池内部和外部温度之间存在近似线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。发现电池内部和外部温度几乎呈线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。发现电池内部和外部温度几乎呈线性关系。还研究了电流速率对最高温度和最大温度差的影响。结果表明,对于最高温度和最大TD都观察到良好的二次函数关系。

更新日期:2021-03-19
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