An electric vehicle alternating current charging protection method and vehicle

CN120207117BActive Publication Date: 2026-07-03CHERY NEW ENERGY AUTOMOBILE TECH CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: CHERY NEW ENERGY AUTOMOBILE TECH CO LTD
Filing Date: 2025-04-11
Publication Date: 2026-07-03

AI Technical Summary

Technical Problem

In existing technologies, repeated charging and stopping of electric vehicles during slow charging due to charging pile or power grid failures may lead to the risk of high-voltage relay sticking, and there is a lack of effective fault identification and protection mechanisms.

Method used

By monitoring abnormal fluctuations in CC and CP signals through the BMS, recording the number of abnormalities and their duration, and combining this with the connection status of the CC signal, the charging process is dynamically controlled, faults are identified in a timely manner, and charging is terminated. The user is notified via the vehicle network, and the charging gun status is identified through the vehicle's camera to prevent human interference.

Benefits of technology

It enables accurate fault identification during slow charging, prevents relay sticking caused by repeated charging, improves charging safety and reliability, and reduces user experience issues.

✦ Generated by Eureka AI based on patent content.

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Figure CN120207117B_ABST

Patent Text Reader

Abstract

This invention discloses an AC charging protection method for electric vehicles and a vehicle thereof. The method includes, during the charging process, the Battery Management System (BMS) detects the CP signal value through the vehicle's On-Board Compass (OBC), monitors abnormal fluctuations in the detected CP signal value, and controls the termination of the charging process based on the abnormal fluctuations in the monitored CP signal. The advantages of this invention are: it can accurately identify faults and prevent charging when an external fault occurs during slow charging of an electric vehicle, protecting the high-voltage relay and vehicle safety, and the implementation method is simple. By identifying the CC and CP signals, the charging process is dynamically monitored, thereby identifying charging fault states and promptly disconnecting or resuming the charging process based on the fault state. This completes the charging protection work while meeting the user's charging needs as much as possible, improving the safety and reliability of charging.

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