Insulation resistance value detection method during connection of power battery of electric vehicle

The invention discloses an insulation resistance value detection method during connection of a power battery of an electric vehicle. According to the method, the insulation resistance values of a positive electrode and a negative electrode can be accurately and quickly calculated, and the influence of a system Y capacitor on a sampling voltage under the condition of connection of the power battery of the electric vehicle is considered; the slope form of an unary linear regression equation in a sliding window is adopted, only the sampling voltage data in the sliding window is stored, and therefore, a data storage amount is small, an occupied memory is small, and the method is more suitable for being used in a vehicle-mounted embedded system; meanwhile, the method can quickly determine and calculate a stationary value when the sampling voltage reaches a stationary state, and therefore, the calculation error is reduced; and arithmetic mean value filtering is carried out on ta e power battery voltage value sample