As electric vehicles (EVs) gain popularity, maintaining optimal battery temperature is crucial for enhancing performance, extending lifespan, and ensuring safety. This study investigates the integration of heat pipes, which facilitate efficient heat transfer, and phase change materials (PCM) that absorb and release thermal energy during phase transitions, providing a dual approach to thermal regulation. The addition of graphene to PCM is objected to improve thermal conductivity and heat dissipation of the system. The proposed system facilitates rapid heat transfer through heat pipes and leverages the high latent heat storage capacity of PCMs and superior thermal conductivity of graphene to effectively regulate the battery temperature. The performance of heat pipe and PCM with graphene combination (7 wt %, 15 wt %, and 30 wt % ) on battery were simulated in an experimental simulation system uder heat load of 22 W, 44 W and 66 W. As a result, integrating graphene into the PCM matrix significantly improves the paraffin wax thermal conductivity, leading to reduced peak battery temperatures under all tested heat loads. Among the tested systems, the one with 30 wt % graphene consistently delivered the most effective cooling, maintaining the lowest temperatures at each heat input. However, at the highest heat load (66 W), the temperature difference between the systems with 15 wt % and 30 wt % graphene was minimal, indicating a potential saturation point in the thermal performance benefits. The findings indicate that the hybrid approach of using heat pipes combined with graphene enhanced PCM offers a promising solution to effectively manage battery thermal dynamics, ultimately contributing to the advancement of electric vehicle technology.