基于储热释放的方形锂电池内部热参数测试
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浙江省自然科学基金(LY18F030011)项目资助


Evaluation of inner thermal properties for prismatic Li-ion battery based on the heat store and release method
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    摘要:

    方形锂电池是卷芯和外壳组成的非均质结构,卷芯导热系数及其与外壳换热系数是影响散热的关键参数,目前缺乏直 接测试方法。 提出利用电池储热构造热源,通过冷却面温度变化触发非稳态传热,使用热成像记录外壳温度沿传热方向空间分 布及其时间演变,代入三维非稳态传热反演模型,同时计算卷芯面向、纵向导热系数,以及卷芯与外壳底部、最大面换热系数。 搭建测试装置,对两种方形锂电池进行多次实验检验重复性,卷芯导热系数测试相对标准差在 5% ~ 10% 之间,对 3 种非均质标 准样品测试检验准确性,相对偏差小于 5% 。 该方法提供一种适用于非均质样品传热特性实验评估的手段,修改样品模型后也 可用于圆柱形锂电池等其他非均质样品。

    Abstract:

    The prismatic Li-ion battery is a heterogeneous structure consisted of jelly-roll and aluminum shell. The thermal conductivity of the jelly-roll and the heat transfer coefficient between the jelly-roll and the shell are key parameters affecting heat dissipation. At present, there is no direct test method. It is proposed to use battery heat storage to construct a heat source, trigger unsteady heat transfer through the temperature change of the cooling surface. The thermal imaging is used to record the spatial distribution of the shell temperature along the heat transfer direction and its time evolution, and substitute it into the three-dimensional unsteady heat transfer inversion model. Meanwhile, core facing, longitudinal thermal conductivity, core and shell bottom, and maximum surface heat transfer coefficient are calculated. Experiment platform is constructed, tests carried out for two battery cells and three standard specimens. The relative standard deviation of the thermal conductivity test results of the two batteries cells is between 5% ~ 10% . The relative deviation of the results for three standard specimens are all below 5% . The method provides a new tool for experimental evaluation of thermal parameters for various non-uniform structures, for example the cylindrical battery cells.

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侯德鑫,多亦贤,叶树亮.基于储热释放的方形锂电池内部热参数测试[J].仪器仪表学报,2022,43(10):32-41

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  • 在线发布日期: 2023-02-06
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