The invention provides an insulation detection method and device for an electric vehicle and the electric vehicle. The method comprises the following steps: starting from a first moment, acquiring a plurality of voltages of an insulation resistance measuring circuit cut off to a current moment in real time, and determining a voltage change rate according to the voltage at the current moment and the voltage at a target moment; when the voltage change rate is equal to a preset threshold value, determining a time range formed from the first moment to the current moment as a target timing range, and determining a ratio of a power supply positive electrode voltage to a power supply negative electrode voltage of the insulation resistance measuring circuit at the current moment as a target voltage ratio; and under the condition that the voltage change rate is smaller than or equal to the target voltage change rate threshold value, it is determined that the voltage of the insulation resistance measuring circuit reaches the stable state, and the problems that in the prior art, a fixed voltage change slope threshold value is adopted for insulation detection of the electric automobile, and consequently the insulation detection precision is low and the detection period is long are solved.

    本申请提供了一种电动汽车的绝缘检测方法、绝缘检测装置与电动汽车。该方法包括:从第一时刻开始起,实时获取绝缘电阻测量电路截止到当前时刻的多个电压,并根据当前时刻的电压以及目标时刻的电压,确定电压变化率;在电压变化率等于预定阈值时,将从第一时刻起,一直到当前时刻构成的时间范围,确定为目标计时范围,且将当前时刻的绝缘电阻测量电路的电源正极电压和电源负极电压的比值,确定为目标电压比;在电压变化率小于或者等于目标电压变化率阈值的情况下,确定绝缘电阻测量电路的电压达到稳定状态,解决了现有技术中采用固定的电压变化斜率阈值,对电动汽车进行绝缘检测,导致的绝缘检测的精度较低以及检测周期较长的问题。


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    Title :

    Insulation detection method and insulation detection device for electric vehicle and electric vehicle


    Additional title:

    电动汽车的绝缘检测方法、绝缘检测装置与电动汽车


    Contributors:
    ZHANG FANG (author) / YUAN WENWEN (author) / XU YAHAN (author) / XUE ZHENJIE (author) / WU XUEQIANG (author)

    Publication date :

    2023-11-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES



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