Abstract
Hexagonal boron nitride and silicone rubber (h-BN/SR) composites were prepared by the mechanical stirring method, and their crystal morphology, chemical structure, thermal properties, and compression stress–strain performance were investigated. The experimental results suggest that silicone rubber combined with h-BN exhibits better thermal conductivity and mechanical properties. When the proportion of h-BN is 30 wt%, the thermal conductivity of the h-BN/SR composite material is 0.58 W/m∙K, which is 3.4 times that of pure silicone rubber. At the same time, the compressive strength of h-BN/SR is 4.27 MPa, which is 6.7 times that of pure silicone rubber. Furthermore, the finite element model was employed to numerically analyze the thermal behavior of a battery with a h-BN/SR composite as the thermal interface material. The analytical results show that the highest temperature of the battery decreased when using h-BN/SR as the thermal interface material in the battery thermal management system. The h-BN/SR composite can thus effectively improve the safety properties of batteries.
Highlights
Thermal interface materials are known to effectively eliminate interface thermal resistance, thereby enhancing interface heat conduction and heat dissipation
The Hexagonal boron nitride and silicone rubber (h-BN/Silicone rubber (SR)) composite material was applied to Battery thermal management (BTM), and finite element software was used to analyze the temperature variations of the battery under different discharge rates and interface gaps
Physical mixing is beneficial for the Hexagonal boron nitride (h-BN)/SR composite to maintain the inherent characteristics of the SR
Summary
Thermal interface materials are known to effectively eliminate interface thermal resistance, thereby enhancing interface heat conduction and heat dissipation. Wang et al, [22] embedded copper tube into the silicon rubber plane and attached the thermal silicon rubber with the prismatic batteries to improve heat exchange These studies did not analyze the extent to which the temperature of the battery could be reduced using thermal silicone rubber. It is necessary to analyze the effects of thermal interface materials on BTM For these reasons, in this study, we chose h-BN as the thermally conductive additive to SR and formulated a h-BN/SR composite material to study its thermal properties and compression stress–strain performance. The h-BN/SR composite material was applied to BTM, and finite element software was used to analyze the temperature variations of the battery under different discharge rates and interface gaps
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