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The growing need for high-performance lithium-ion battery modules in different applications requires the creation of effective thermal management systems to tackle the issues related to heat production and dissipation. The research introduces a new Hybrid Thermal Management System (HTMS) aimed at improving the thermal efficiency of Li-ion battery modules. HTMS uses active and passive cooling to enhance temperature regulation, reduce thermal strain, and prolong the battery’s lifespan. This study examines the dynamic thermal behaviour of an air- cooled Battery Thermal Management System (BTMS) at 1C discharge rate. This investigation will take into consideration a variety of design and flow adjustments, in addition to other factors. Moreover, the comprehensive integrated thermal-electrochemical model demonstrates that the thermal performance of the battery thermal management system (BTMS) is influenced by the quantity of battery cells, how the cells are arranged inside the module, and the air velocity. This is demonstrated by the fact that the BTMS is a thermal management system. This work investigates the standard deviation, heat generation plots, discharge curves, streamline profiles, temperature contours, average, and maximum temperature variation in the module. Additionally, the work determines the maximum temperature variation.