人员触电防护一直是电池包设计的重要考虑点,随着电池包的电压不断升高,为确保车辆内部、外部人员以及车辆环境的安全,如何做好触电防护的预警就显得尤为重要。目前普遍通过电池包中电池管理系统模块来检测电池包的绝缘值,并在 QCT 897-...人员触电防护一直是电池包设计的重要考虑点,随着电池包的电压不断升高,为确保车辆内部、外部人员以及车辆环境的安全,如何做好触电防护的预警就显得尤为重要。目前普遍通过电池包中电池管理系统模块来检测电池包的绝缘值,并在 QCT 897-2011 也定义了最小绝缘阻值。本文先分析了目前普遍的绝缘检测的方法,后提出了小信号注入检测法,提高了绝缘精度,增强了检测可靠性。该系统由电源模块 , 方波发生模块 , 滤波模块,采样模块组成,利用该系统对96串三元电池包的绝缘状况进行测试。模拟结果表明:绝缘测量误差可以控制在-10%以内,另外可以通过自身校验提高检测的可靠性。因此,设计的绝缘检测系统可以满足纯电动汽车动力电池的绝缘检测要求。Abstract:Electric shock protection has always been an important consideration in battery pack design.With the increasing voltage of battery pack,how to do electric shock protection early warning becomes particularly important in order to ensure the safety of internal and external personnel and vehicle environment.At present,the insulation value of the battery pack is generally detected by the battery management system module in the battery pack,and the minum value of insulation is also defined in QCT 897-2011.This paper first analyzes the current common insulation detection methods,and then puts forward the small signal injection detection method,which can improve the insulation accuracy and also the detection reliability is enhanced.The system consists of power module,square wave generating module,filter module and sampling module.The insulation condition of 96S NCM battery pack is tested by using this system.The simulation results show that the insulation measurement error can be controlled within -10% and the reliability can be guaranteed by self-check.Therefore,the insulation detection system can meet the requirements of the battery insulation detection of pure electric vehicle.展开更多
文摘人员触电防护一直是电池包设计的重要考虑点,随着电池包的电压不断升高,为确保车辆内部、外部人员以及车辆环境的安全,如何做好触电防护的预警就显得尤为重要。目前普遍通过电池包中电池管理系统模块来检测电池包的绝缘值,并在 QCT 897-2011 也定义了最小绝缘阻值。本文先分析了目前普遍的绝缘检测的方法,后提出了小信号注入检测法,提高了绝缘精度,增强了检测可靠性。该系统由电源模块 , 方波发生模块 , 滤波模块,采样模块组成,利用该系统对96串三元电池包的绝缘状况进行测试。模拟结果表明:绝缘测量误差可以控制在-10%以内,另外可以通过自身校验提高检测的可靠性。因此,设计的绝缘检测系统可以满足纯电动汽车动力电池的绝缘检测要求。Abstract:Electric shock protection has always been an important consideration in battery pack design.With the increasing voltage of battery pack,how to do electric shock protection early warning becomes particularly important in order to ensure the safety of internal and external personnel and vehicle environment.At present,the insulation value of the battery pack is generally detected by the battery management system module in the battery pack,and the minum value of insulation is also defined in QCT 897-2011.This paper first analyzes the current common insulation detection methods,and then puts forward the small signal injection detection method,which can improve the insulation accuracy and also the detection reliability is enhanced.The system consists of power module,square wave generating module,filter module and sampling module.The insulation condition of 96S NCM battery pack is tested by using this system.The simulation results show that the insulation measurement error can be controlled within -10% and the reliability can be guaranteed by self-check.Therefore,the insulation detection system can meet the requirements of the battery insulation detection of pure electric vehicle.
