Uğur Moralı
The regulation of thermal dynamics in lithium‐ion batteries is vital for operational efficiency, safety, and longevity in electric vehicles, especially under elevated ambient temperatures and heightened discharge requirements. The present study analyzes the thermal characteristics of a prismatic lithium‐ion battery under diverse ambient temperature conditions and discharge rates, employing the ANSYS Fluent computational platform. At an environmental temperature of 45C and a discharge rate of 5C, the temperature of the battery surface was observed to surpass the permissible operational limit, underscoring the necessity for a robust thermal management strategy. To address this, a composite phase change material‐based thermal management system incorporating RTHC44 and expanded graphite was proposed. The influence of phase change material thickness and expanded graphite content on thermal performance was evaluated. Results indicated that a phase change material layer thickness of 9 mm successfully maintained the battery surface temperature below 60C. Additionally, an expanded graphite content of 12 wt% was identified as the optimal composition for enhancing thermal conductivity. This research offers significant perspectives for optimizing thermal management systems with phase change materials to enhance lithium‐ion battery performance and reliability.