电动汽车动力电池绝缘电阻实时在线监测系统

Real-time on-line monitoring system for power battery insulation resistance of electric vehicle

利用4个继电器开关和4个1%精度的电阻分别并联在动力电池的正负极与底盘之间,设计了一种简单的动力电池绝缘电阻实时监测系统,可以有效避免目前绝缘检测方法存在的局限性。利用SE40AHA磷酸亚铁锂电池组对系统进行了实际测试,测试结果显示,系统可以对电池充放电过程的绝缘电阻进行实时检测,检测精度在3%以内。

In order to overcome the disadvantages of current insulation detection method,a new method is designed and realized with four relay switches and four 1% resistances in parallel respectively between positive or negative electrode of the power battery and the chassis;and a simple real-time battery insulation on-line monitoring system is developed.This method can effectively avoid the limitations of the current insulation detection method.The system was tested with SE40 AHA lithium iron phosphate battery.The results show that the system can be used to monitor the insulation resistance during the power battery charging and discharging process and the insulation detection precision is within 3%.