Battery management system, battery pack, electric vehicle and battery management method

By utilizing SOC changes and statistical algorithms during the charging and discharging of battery cells, internal short-circuit faults in series-connected battery cells are detected, solving the problem of low detection accuracy in existing technologies and achieving efficient fault detection.

CN116601508BActive Publication Date: 2026-07-24LG ENERGY SOLUTION LTD
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2022-06-14
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies struggle to efficiently detect internal short-circuit faults in series-connected battery cells, especially since the minimum and maximum voltages are significantly affected by other factors, resulting in low detection accuracy. Furthermore, the integration of charging/discharging current makes it difficult to extract useful information.

Method used

By utilizing the state of charge (SOC) changes during the charging and discharging of battery cells, and combining SOC estimation algorithms and statistical algorithms, the SOC changes and fault factors of each battery cell are determined, and internal short-circuit faults are detected.

Benefits of technology

This technology enables efficient detection of internal short-circuit faults in series-connected battery cells, improving detection accuracy and reducing the impact on battery system performance and safety.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116601508B_ABST
    Figure CN116601508B_ABST
Patent Text Reader

Abstract

A battery management system according to the present invention includes a sensing circuit to acquire a state parameter of each of a plurality of battery cells connected in series, and a control circuit to apply a state of charge (SOC) estimation algorithm to the state parameter acquired during charging to determine, for each battery cell, a first SOC change, the first SOC change being a difference between a first SOC at a first charging point and a second SOC at a second charging point. The control circuit applies a statistical algorithm to the first SOC changes of at least two battery cells among the plurality of battery cells to determine a reference factor. The control circuit detects an internal short circuit fault in each battery cell based on the first SOC change of each battery cell and the reference factor.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Autonomous vehicle for blind people

    KR1020210077048A

  • Diagnosis method for online fault of battery pack

    CN108196190A