膨胀石墨/石蜡复合材料的制备及热管理性能

doi:10.11868/j.issn.1001-4381.2016.000919

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摘要

石蜡作为相变材料（PCM），膨胀石墨（EG）为导热增强剂，制备不同EG含量的膨胀石墨/石蜡（EG/PCM）复合材料。采用瞬态热线法测量样品的导热系数；把EG/PCM应用于锂离子电池热管理，研究不同EG含量的EG/PCM热管理性能；采用ANSYS软件分析EG/PCM的导热系数对锂离子电池热管理的影响。结果表明：EG的加入大幅度提高了PCM的导热系数，EG含量≥9%时，EG/PCM的导热系数呈各向异性；锂离子电池表面温度随EG含量增加而减小，EG（12）/PCM（88）表现出优异的热管理性能；适当地提高EG/PCM的径向导热系数，有利于提高它的热管理性能。

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	姜贵文
	黄菊花

关键词 ： PCM, EG, 导热系数, 热管理, 锂离子电池

Abstract：

A series of expanded graphite (EG)/paraffin composites with various EG contents were prepared for Li-ion battery thermal management, in which paraffin was chosen as PCM and EG as the promoter of thermal conductivity. The thermal conductivity of the samples was measured by a thermal conductivity analyzer based on the transient hot wire method.The effect of EG content in composite on Li-ion battery thermal management was investigated. The thermal management performance of EG/PCM composites with different thermal conductivity was also discussed by software ANSYS. The results show that:EG incorporation dramatically enhances the thermal conductivity of PCM; the thermal conductivity of EG/PCM shows anisotropy, with EG content equaling to or exceeding 9%; The temperature of Li-ion battery surface decreases with an increase in EG content of composite, EG(12)/PCM(88) exhibits excellent thermal management for Li-ion battery.To adequately increase the thermal conductivity of EG/PCM in radial direction is beneficial to improve Li-ion battery thermal management.

Key words： phase change material expanded graphite thermal conductivity thermal management Li-ion battery

收稿日期: 2016-07-30 出版日期: 2017-07-21

中图分类号:

TK02

基金资助:江西省高等学校教育厅高等学校落地计划项目(XILD11022)

通讯作者: 姜贵文 E-mail: jgw_cailiao@163.com

作者简介: 姜贵文(1978-), 男, 博士, 研究方向:复合相变材料及电池热管理研究, 联系地址:江西省南昌市南昌大学前湖校区机电工程学院(330031), E-mail:jgw_cailiao@163.com

引用本文:

姜贵文, 黄菊花. 膨胀石墨/石蜡复合材料的制备及热管理性能[J]. 材料工程, 2017, 45(7): 41-47.
Gui-wen JIANG, Ju-hua HUANG. Preparation and Thermal Management of Expanded Graphite/Paraffin Composite for Li-ion Battery. Journal of Materials Engineering, 2017, 45(7): 41-47.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000919 或 http://jme.biam.ac.cn/CN/Y2017/V45/I7/41

Fig.1 EG/PCM复合材料样品(a)粉末；(b)板状块体和空圆柱体

Fig.2 采用瞬态热线法测试样品导热系数的原理图(a)实验装置示意图；(b)测轴向导热系数；(c)测径向导热系数

Fig.3 裹有PCM的电池物理模型及网格分布

Fig.4 样品SEM图片(a)，(b)EG; (c)EG/PCM

Fig.5 不同EG含量时EG/PCM复合材料的导热系数

Fig.6 有效热传导模型(a)并联模型；(b)串联模型

Table 1 不同EG含量的EG/PCM复合材料的ψ值

Fig.7 5C放电，电池表面及PCM外表面的温度变化曲线

Fig.8 不同EG/PCM的导热系数下电池表面温度变化曲线

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