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

PL4286870T3Active Publication Date: 2026-06-29LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
PL · PL
Patent Type
Patents
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2022-07-26
Publication Date
2026-06-29

AI Technical Summary

Technical Problem

Existing battery management systems face challenges in accurately detecting internal short circuit faults in batteries without voltage imbalances, as balancing operations mitigate the voltage imbalances necessary for fault detection.

Method used

A battery management system that includes a battery monitor, balancer, and control circuit to detect voltage deviations and compensate for balancing capacity, allowing for the detection of internal short circuit faults by comparing voltage changes over time with a threshold, even in the absence of voltage imbalances.

Benefits of technology

Enables accurate detection of internal short circuit faults in batteries, preventing potential fires and ensuring system safety by compensating for balancing operations and using voltage deviation analysis.

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Abstract

A battery management system according to the present disclosure includes a battery monitor, a balancer and a control circuit to control the balancer. The control circuit determines a first voltage value indicating a no-load voltage of each battery, compensates the first voltage value of each battery using a balancing capacity of each battery by a balancing operation for a latest reference time, determines a voltage deviation which is a difference between the compensated first voltage value of each battery and a reference voltage value, and detects an internal short circuit fault in each battery by comparing a change amount of the voltage deviation of each battery for the reference time with a threshold.
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