The invention discloses a power battery insulation detection method and device, a battery management system and a vehicle, the power battery insulation detection method is used for an insulation detection circuit, the insulation detection circuit comprises a first voltage dividing unit, a second voltage dividing unit, a third voltage dividing unit and a fourth voltage dividing unit, and the insulation detection circuit further comprises a separation switch and a change-over switch; the power battery insulation detection method comprises the following steps: when the separation switch is in a closed state, acquiring first voltage detection values at two ends of the fourth voltage division unit; determining that the first voltage detection value meets an abnormal threshold condition; controlling the separation switch and the change-over switch to be switched off, and obtaining second voltage detection values at the two ends of the fourth voltage division unit; and determining the fault state of the insulation detection circuit according to the second voltage detection value. According to the method and the device, the fault state of the insulation detection circuit can be accurately identified, false alarm or missing alarm of insulation alarm is avoided, and the insulation detection reliability is improved.
本发明公开了一种动力电池绝缘检测方法和检测装置及电池管理系统和车辆,该动力电池绝缘检测方法用于绝缘检测电路,绝缘检测电路包括第一分压单元、第二分压单元、第三分压单元和第四分压单元,还包括分离开关和切换开关,动力电池绝缘检测方法包括:在所述分离开关处于闭合状态时,获取所述第四分压单元两端的第一电压检测值;确定所述第一电压检测值满足异常阈值条件;控制所述分离开关和所述切换开关均断开,获取所述第四分压单元两端的第二电压检测值;根据所述第二电压检测值确定所述绝缘检测电路的故障状态。本发明的方法和装置,可以准确识别绝缘检测电路的故障状态,避免绝缘告警的误报或漏报,提高绝缘检测可靠性。
Power battery insulation detection method and detection device, battery management system and vehicle
动力电池绝缘检测方法和检测装置及电池管理系统和车辆
22.11.2024
Patent
Elektronische Ressource
Chinesisch
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