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A nano-sheet graphene-based enhanced thermal radiation composite for passive heat dissipation from vehicle batteries

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Nano Materials Science 2024年第4期6卷 443-455页

作者： Ji-Xiang Wang christopher salmean Jiaxin Li Chaojie Lei Jun Li Mingliang Zhong Bo Qi Yufeng Mao Hebei Key Laboratory of Man-machine Environmental Thermal Control Technology and Equipment Hebei Vocational University of Technology and Engineering College of Electrical Energy and Power EngineeringYangzhou University Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Taizhou Wavexploration Energy Ltd. Department of Electrical and Computer Engineering University of Toronto China Academy of Launch Vehicle Technology Beijing Sino-Spark Technology Co. Ltd. School of Environmental Science and Engineering Suzhou University of Science and Technology Institute of Optics and Electronics Chinese Academy of Sciences National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences

In response to thermal runaway(TR) of electric vehicles, recent attention has been focused on mitigation strategies such as efficient heat dredging in battery thermal management. Thermal management with particular focus on battery cooling has been becoming increasingly significant. TR usually happened when an electric vehicle is unpowered and charged. In this state, traditional active battery cooling schemes are disabled, which can easily lead to dangerous incidents due to loss of cooling ability, and advanced passive cooling strategies are therefore gaining importance. Herein, we developed an enhanced thermal radiation material, consisting of ～1 μm thick multilayered nano-sheet graphene film coated upon the heat dissipation surface, thereby enhancing thermal radiation in the nanoscale. The surface was characterized on the nanoscale, and tested in a battery-cooling *** found that the graphene-based coating's spectral emissivity is between 91 % and 95 % in the mid-infrared region, and thermal experiments consequently illustrated that graphene-based radiative cooling yielded up to15.1 % temperature reduction when compared to the uncoated analogue. Using the novel graphene surface to augment a heat pipe, the temperature reduction can be further enlarged to 25.6 %. The new material may contribute to transportation safety, global warming mitigation and carbon neutralization.

关键词： Battery thermal management Nano-sheet graphene Functional material Passive cooling Thermal radiation

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