A fast insulation test method for battery management system based on least squares method
SUN Lin
LIU Jiangfeng
YANG Yinan
ZHANG Chao
LIU Yiqiang
PEI Yitong
Abstract：In order to improve the insulation detection capability of battery management system(BMS)for the high-voltage batteries of new energy vehicles,the insulation detection circuit is designed based on the unbalanced bridge method,and the insulation detection process is built.However,the conventional insulation detection method has a long cycle,it cannot meet the technical requirements of insulation quick detection,so an insulation detection method based on the least squares method is proposed on the MATLAB/Simulink software development platform.After a lot of testing of vehicles and HIL bench,the results show that the conventional insulation detection method has high accuracy,long detection cycle,only suitable for cyclic detection;the least square insulation quick detection method,short detection period and can complete insulation resistance value calculation within 3 s,When the insulation resistance value is small,the detection accuracy is high,and the insulation fault identification is highly accurate,which can fully meet the technical requirements of insulation quick test.This method is an innovative insulation test method,which can supplement the empty window period of insulation test before vehicle power on.Realize the uninterrupted insulation detection of the high-voltage battery,and ensure the high-voltage safety of the battery.
Keywords：high-voltage systemunbalanced bridge methodinsulation detectionleast squares methodquick insulation inspection
Publication Date：2025-02-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 24-30 )