关键词: 动力电池系统；热管理系统；液冷系统；流道结构

Abstract: Under normal circumstances, the performance of the power battery system is greatly affected by temperature, so that the power battery works in a reasonable temperature range requires the participation of the thermal management system, which is also an effective way to improve the temperature consistency of the power battery. Among them, the heat dissipation effect of the liquid cooling system is related to the distribution trend of the flow channel, so it is important to implement the flow channel design of the liquid cooling system. In this paper, the difference of battery charging time under different temperature rise rates is compared, and six flow channel structures are proposed, and the flow field and thermal field simulation analysis of six structures is carried out by Star CCM+ software based on low temperature heating conditions. The results show the necessity of adopting liquid cooling system for new energy vehicles. Through the optimization of the flow channel design, the flow resistance of the system is effectively reduced and the temperature uniformity of the system is improved. At the same time, it is proved that only through the heat dissipation analysis and research of modular liquid cooling system and combined with the application requirements in actual engineering, it is expected to obtain the best performance and reasonable and feasible liquid cooling system scheme.

Key words: Power battery system; Thermal management system; Liquid cooling system; Runner structure