混合动力汽车动力电池主动热管理系统设计

Active thermal management system design of Ni-MH battery in hybrid electric vehicle

针对以电池表面温度作为控制目标的常规热管理系统,存在散热滞后、电池内部温升过快以及在较高温升时输出功率受到限制的问题,设计了基于电池内部温度预测的主动散热式热管理系统。系统以测试的电池表面温度、电池材料参数和电池发热量作为输入量,预测电池内部的最高温度及其传热过程,对风机进行预控制,实现电池包温度的平稳控制。实验表明了系统能保证电池工作时温度变化平缓,处在最优温度范围内,避免了电池内部的累积生热量导致的电池温度急剧上升的问题,为混合动力汽车的电池热管理系统设计提供了参考。

In view of the problems, such as delayed cooling, fast increasing inner temperature and the output power limit at high temperature, caused by ordinary battery thermal management system with surface temperature as control target, an active thermal management system based on predicting inner temperature of battery was designed. In this system, surface temperature, parameters of battery material and heat generation were used as the inputs to predict the highest inner temperature and the process of heat transfer. Based on the prediction, the fan could be pre-control ed, and the balanced control of battery temperature was realized. The experiments show that the system can make the battery＇s working temperature change stably and be maintained in the best temperature range, avoiding the problem of sharp temperature raise resulted from accumulated heat. The research provides the theoretical basis for the design of hybrid electric vehicle thermal management system.