动力电池管理系统核心控制策略开发

Development of Core Control Strategy for Power Battery Management System

插电式混合动力汽车具有电池荷电状态(SOC)使用范围大、整车的工作模式多、用户使用情况复杂等特点,且磷酸铁锂的电池单体电压曲线相对于三元材料的锂离子电池单体曲线更加平坦,低温充电能力差等,因此对锂离子动力电池管理系统的核心功能和性能提出了比纯电动汽车和混合动力汽车更高的要求。开发基于AH积分和静置后上电电压修正以及车载充电机充电修正的SOC估算策略;测试充放电许用功率曲线,开发了动力电池故障、低温低电量下充放电许用功率估算策略。目前东北示范的某型号汽车均采用了此控制策略,整车在各种不同复杂工况、工作模式和高、低温环境条件下运行状态良好,保持较低的动力电池故障率,能够满足示范运营的要求。

Plug-in hybrid electric vehicle has many characteristics,such as a wide range of battery state of charge(SOC),many working modes of the whole vehicle and complex user usage.Moreover,the voltage curve of lithium iron phosphate battery is flatter than that of lithium ion battery with ternary materials,while its charging capacity at low temperature is poor.Therefore,the core function and performance for lithium ion power battery management system are proposed to be better than that of pure electric vehicle and hybrid electric vehicle.The SOC estimation based on AH integral,static voltage correction and vehicle charger’s charging correction was developed.The estimation strategy of power battery failure,allowable charging and discharging capacity under low temperature and low power consumption was developed according to the allowable test charging and discharging capacity curve.At present,the control strategy developed was used at a certain demonstration vehicle in Northeastern China.The whole vehicle runs well under various complex working conditions,working modes,high and low temperature conditions,while it maintains a low power battery failure rate,meeting the requirements of demonstration operation.