An adequate battery thermal management system is indispensable for ensuring the safety and stability of lithium-ion batteries. This work aims to evaluate the thermal behavior of a lithium-ion battery module cooled with phase change material (PCM) cooling using a computational fluid dynamics (CFD) approach in ANSYS Fluent. Four cell arrangements, including sixteen 18650 lithium-ion cells, were proposed and analyzed within the battery module. Discharging tests at 1C, 2C, 3C, and 4C rates were simulated for each arrangement. The results reveal distinct thermal behaviors in the battery module, influenced by the cell arrangement and the use of finned structures. The highest recorded temperature, 58.34 \(^\circ \) C, was reached at a 4C rate with cells arranged in a rectangular pattern. In contrast, the lowest cell temperature across all discharge rates was observed in a circular arrangement with fins attached to the surface of each cell.