▎ 摘　　要

Li-ion batteries play a vital role in electromechanical devices. The heat load on such batteries varies with time and application which falls as high temperature rise and it causes severe damages on a device and reduces the life cycle. It will be a big challenge in future decades of electronic devices and the electric car revolution. To overcome such difficulties, this work is considered for thermal management of small Li-ion batteries to check the possibilities through the micro heat pipe. Due to the high impact of nanotechnology in heat transfer science, acetone, deionized water, and tetrahydrofuran fluids are blended with graphene oxide nanoparticks to prepare the nanofluids by ultrasonic method. Here, tetrahydrofuran is a new combination of nanoworking fluid and not addressed by pre-researchers. Tetrahydrofuran-graphene nanofluid provides 61% of improved thermal conductivity than the other two fluids which accelerates the heat transfer rate with reduced thermal resistance in the range of 0.09-0.64 degrees C/W. To validate the experimental results, a real-time study has been done on Li-ion batteries for a day and ensured the reduction of overheat issues. Hence, the present work will support the Li-ion battery to work in an optimal temperature range in a new way of micro heat pipe with nanofluid.