
膨胀石墨/石蜡复合材料的制备及热管理性能
Preparation and Thermal Management of Expanded Graphite/Paraffin Composite for Li-ion Battery
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。
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.
PCM / EG / 导热系数 / 热管理 / 锂离子电池 {{custom_keyword}} /
phase change material / expanded graphite / thermal conductivity / thermal management / Li-ion battery {{custom_keyword}} /
图 5 不同EG含量时EG/PCM复合材料的导热系数Fig.5 Thermal conductivity of EG/PCM composites with different EG contents |
表 1 不同EG含量的EG/PCM复合材料的ψ值Table 1 The ψ values of EG/PCM composites with different EG contents |
Mass fraction of EG/% | kmax/(W·m-1·K-1) | kmin/(W·m-1·K-1) | kradial/(W·m-1·K-1) | kaxial/(W·m-1·K-1) | ψ value | |
Eq. (10) | Eq. (11) | |||||
9 | 7.51 | 0.208 | 3.50 | 2.80 | 0.451 | 0.690 |
12 | 10.25 | 0.212 | 5.74 | 4.31 | 0.553 | 0.588 |
16 | 13.91 | 0.216 | 7.51 | 5.70 | 0.576 | 0.591 |
20 | 17.7 | 0.220 | 10.10 | 7.22 | 0.590 | 0.601 |
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