Electric vehicle insulation resistance measurement method and device, vehicle and storage medium

Abstract

The embodiment of the invention discloses an electric vehicle insulation resistance measurement method and device, a vehicle and a storage medium. The method comprises the following steps: determininga first insulation voltage of a positive electrode insulation resistor and a second insulation voltage of a negative electrode insulation resistor of a vehicle-mounted battery; according to the firstinsulation voltage and the second insulation voltage, measuring resistors with preset resistance values are connected to the two ends of the positive electrode insulation resistor or the negative electrode insulation resistor in parallel; after the measurement resistor is connected in parallel, sampling the voltage at the two ends of the positive insulation resistor and the voltage at the two ends of the negative insulation resistor within a first preset time to determine a first estimated voltage of the positive insulation resistor and a second estimated voltage of the negative insulation resistor; and determining negative insulation resistance and negative insulation resistance according to the first insulation voltage, the second insulation voltage, the measurement resistance, the first estimation voltage and the second estimation voltage. According to the embodiment of the invention, the steady-state voltage estimation value is solved through the sampling data, the sampling speedis accelerated, and the measurement time consumption of the insulation resistance is reduced.

Description

Technical field [0001] The embodiments of the present invention relate to the technical field of electric vehicles, and in particular to a method, a device, a vehicle, and a storage medium for measuring insulation resistance of an electric vehicle. Background technique [0002] An electric vehicle (Battery Electric Vehicle, BEV) refers to a vehicle that is powered by an on-board battery and driven by a motor to drive wheels. It meets the requirements of road traffic and safety regulations. Since electric vehicles have less environmental impact than traditional vehicles, their prospects It is widely optimistic. [0003] Due to the on-board battery, in order to prevent the on-board battery from harming the human body, the insulation state of the electric vehicle is an important indicator of the vehicle. At present, the insulation status of the entire vehicle is generally collected and monitored by the Battery Management System (BMS) in real time. The BMS generally uses the unbalance...

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Problems solved by technology

[0004]However, in electric vehicles, there are Y capacitors in the positive and negative poles of the vehicle battery and the ground of the vehicle body. After connecting resistors in parallel to the positive and negative circuits of the battery, the resistance and Y The capacitor forms an RC charge and discharge circuit, which causes voltage instability. In order to accurately measure the voltage value before and after the parallel resistance, it is necessary to wait for the voltage to stabilize before measuring, which makes the measurement of the voltage value too long, and the calculation of the insulation value and Necessary sampling and filtering time, the time consumption of insulation resistance measurement also increases

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