The lithium-ion battery is widely used as a subsystem that powers electric vehicles and supplies energy due to its lengthy cycle and high energy density. Maintaining an appropriate temperature is the most important factor that improves battery performance and avoids thermal runaway propagation of lithium-ion power battery modules. This study presents the performance results of a unique hybrid cooling system for a battery module compared to single-air cooling. A combined battery thermal management system with Composite phase change material RT44HC with forced convection air cooling to enhance the operating performance of the lithium-ion battery pack, a novel structure was proposed and then applied for a four parallel (4P) battery pack, which integrates composite phase change material around every cell of battery and forced-air convection. In the experiment for this system, the designed module achieves a compact cylindrical shape for each single battery, preventing composite phase change material leakage when changing to a liquid state with a one C discharge rate. According to experimental results, the maximum temperature Tmax decreased from 60oC at the discharging time of 39 min to The maximum temperature Tmax 42.7oC at discharging time of 47.4 with hybrid forced air and composite phase change material cooling at discharging time 56 min (complete discharge rate of the battery) and The maximum temperature difference ∆Tmax decreased from 5ooC with conventional air cooling to maximum temperature difference ∆Tmax 3.5oC which preventing risk of thermal runaway and enhance the cooling performance of battery thermal manage system for the battery pack.