石蜡/膨胀石墨复合相变材料耦合热管电池热管理性能研究
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中山大学

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TB34

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教育部联合基金(6141A02022533);国家自然科学基金(12072383)


石蜡/膨胀石墨复合相变材料耦合热管电池热管理性能研究
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Sun Yat-sen Unversity

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    摘要:

    为了改善相变材料用于电池热管理导热率较低的问题,制备了不同含量的石蜡(Paraffin, PA)-膨胀石墨(Expanded Graphite, EG)复合相变材料,在相变储能单元中使用PA-EG复合相变材料包裹热源并耦合热管增强其散热能力。使用方形发热源模拟高密度能量电池充放电时的发热,在不同发热功率下探究不同EG含量的PA-EG复合相变材料耦合热管的热管理性能。实验结果表明,发热功率较低时,各相变材料热管理性能相当,发热功率较高时,更高的EG含量将带来更高的导热率以及更好的热管理效果。在EG含量为5%时,PA-EG复合相变材料导热率可提高至纯石蜡的6.36倍,实验中最大降温幅度可达7.6%,相变储能单元中温差峰值为纯石蜡散热系统温差峰值的37.7%。当EG含量较低时,PA-EG复合相变材料未熔融时呈现固态,导热率呈现各向同性,但当PA熔融后,PA-EG复合相变材料总体呈现液态,出现较强的自然对流换热,将导致储能单元内温度分布不均,容易导致电池表面温度不均产生应力,因此EG含量不宜低于5%。

    Abstract:

    In order to improve the low thermal conductivity of phase change materials for battery thermal management, paraffin-expanded graphite composite phase change materials with various contents were prepared. In the phase change energy storage unit, PA-EG composite phase change materials are used to wrap the heat source and the heat pipe is coupled to enhance its heat dissipation capacity. A square heating source is used to simulate the heating of a high-density energy battery, and the thermal management performance of the PA-EG composite phase change materials coupled heat pipe with different EG content is explored under different heating powers. The experimental results show that when the heating power is low, the thermal management performance of each phase change material is equivalent. When the heating power is higher, the higher EG content will bring higher thermal conductivity and better thermal management effect. When the EG content is 5%, the thermal conductivity can be increased to 6.36 times that of paraffin. The maximum cooling rate in the experiment can reach 7.6%, and the peak temperature difference in the phase change energy storage unit is 37.7% of that in the paraffin system. When the content of EG is low, the thermal conductivity of PA-EG composite phase change material is isotropic when it is not melted, but when the PA is melted, the strong natural convection heat exchange will cause uneven temperature distribution in the energy storage unit. It will easily lead to uneven temperature on the battery surface to produce stress, so the EG content should not be less than 5%.

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陈忱,孙俊俊,朱庆勇. 石蜡/膨胀石墨复合相变材料耦合热管电池热管理性能研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-17
  • 最后修改日期:2022-03-26
  • 录用日期:2022-04-30
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