关键词: 热管理系统；分离式；动力电池；相变材料；热管辅助；系统设计

Abstract: Thermal management system has a crucial influence on the performance of electric vehicle power battery system. Effective thermal management system can improve the working environment of power battery, make the power battery work in the best temperature, and ensure the driving performance and driving safety of electric vehicle. Aiming at the problems existing in the current power battery thermal management system, this paper designs a separate battery thermal management system assisted by heat pipe, and carries out a parametric numerical simulation of the proposed battery thermal management system. The results show that the phase change temperature plays an important role in controlling the temperature of the battery. The high thermal conductivity of the phase change material makes the composite phase change material strengthen the heat dissipation of the battery pack well, but when the thermal conductivity increases to a certain degree, the downward trend of the battery temperature tends to be gentle. High convective heat transfer coefficient is beneficial to release latent heat of phase change materials and improve the utilization rate of phase change materials, but high convective heat transfer coefficient can not further improve the performance of the system, and will lead to cost increase and other problems.

Key words: Thermal management system; Separation type; Power batteries; Phase change material; Assistcd by heat pipe; System design