混合动力汽车用镍氢蓄电池组热管理方法

摘要

The temperature rise and distribution of Ni - MH battery pack during its charging and discharging were studied. Considering the larger initial charging current due to the battery temperature rise a phased constant current charging control strategy was proposed. By analyzing the theoretical temperature fields model, the cooling structure of the original battery pack was optimized, and a phased joint control of constant current charging strategy was proposed. Then, a simulation of the battery thermal management control method was conducted and a test bench was setup about the battery pack temperature fields in the computing environment of Matlab/Simulink and Fluent. The test results verifed the advantages of the battery thermal management control method that we proposed.%针对镍氢电池温度变化直接影响电池组的性能和寿命等问题,研究了镍氢蓄电池组充放电产生的温升和温度分布.分析了电池产热机理,以降低电池组的最高温升为目标,综合考虑了电池温升和充电电流等因素的较大初始充电电流,提出了分阶段恒流充电控制策略,并进行了数值仿真分析.通过电池组温度场模型理论分析,对现有电池组散热结构进行了优化,通过仿真计算验证了该优化结构的合理性,提出了电池散热结构优化措施和分阶段恒流充电策略的联合控制方法,在Matlab/Simulink和Fluent的计算环境下,进行了电池组热管理控制方法的仿真计算,并搭建电池组温度场试验台,试验结果验证了该电池组热管理方法的优越性.