Electric vehicle battery insulation detection system and method

Abstract

The invention relates to an electric vehicle battery insulation detection system and method. The electric vehicle battery insulation detection system comprises a whole vehicle circuit, an insulation acquisition circuit, a high-voltage acquisition circuit and a control acquisition module, wherein the whole vehicle circuit comprises a battery pack, a positive end insulation resistor, a negative end insulation resistor and a capacitor assembly, the insulation acquisition circuit comprises a first electronic switch connected with the whole vehicle ground, a second series circuit, a third series circuit electrically connected with the first electronic switch and connected with the second series circuit in parallel, and a second electronic switch electrically connected with the third series circuit and electrically connected with the negative electrode of the battery pack, the high-voltage acquisition circuit comprises a fourth series circuit, and the control acquisition module is electrically connected with the first electronic switch, the second electronic switch, the third series circuit and the fourth series circuit. According to the invention, the circuit structure is simplified, the reliability of insulation detection is improved, and the high-voltage safety of the whole vehicle is guaranteed.

Description

technical field [0001] The present application relates to the technical field of electric vehicle batteries, in particular to an electric vehicle battery insulation detection system and method. Background technique [0002] The power source of an electric vehicle is the battery pack. Ideally, the battery pack is completely insulated from the vehicle body. The insulation performance of the power battery and the vehicle body directly determines the safety of the vehicle; , so it is developing towards high-voltage battery voltage, but higher and higher voltages also bring more and more potential safety hazards; when electric vehicles cause temperature and humidity changes, wading, and wiring harness aging due to the environment and self-heating, The insulation performance of the power battery to the vehicle ground decreases, resulting in an increase in leakage current, which endangers the personal safety of vehicle use and maintenance personnel. [0003] Since a leakage curren...

AI Technical Summary

Problems solved by technology

[0002] The power source of an electric vehicle is the battery pack. Ideally, the battery pack is completely insulated from the vehicle body. The insulation performance of the power battery and the vehicle body directly determines the safety of the vehicle; , so it is developing towards high-voltage battery voltage, but higher and higher voltages also bring more and more potential safety hazards; when electric vehicles cause temperature and humidity changes, wading, and wiring harness aging due to the environment and self-heating, The insulation performance of the power battery to the vehicle ground decreases, resulting in an increase in leakage current, which endangers the personal safety of vehicle use and maintenance personnel

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