Battery diagnostic device and its operating method

The battery diagnostic device uses an equivalent circuit model to analyze current and voltage data for rapid identification of defects in battery cells, addressing the limitations of existing methods by enabling timely detection and classification of defects.

JP2026519620APending Publication Date: 2026-06-16LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2023-12-05
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing battery diagnostic methods are inadequate for quickly identifying specific types of defects in battery cells within a battery pack, particularly during use, as they primarily assess deterioration rather than defects, leading to potential safety risks.

Method used

A battery diagnostic device and method that utilizes an information acquisition unit to collect current and voltage data, employing an equivalent circuit model to determine target intervals and diagnose defects by analyzing parameters related to resistance and capacitance components, allowing for rapid identification of defective cells based on threshold values.

Benefits of technology

Enables rapid diagnosis of battery cell defects, distinguishing between different types of defects, thereby enhancing safety by identifying and addressing potential issues promptly.

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Abstract

According to embodiments disclosed herein, a battery diagnostic device may include: an information acquisition unit that acquires current and voltage data for each of a plurality of battery cells; and a controller that determines a target section based on the current of the battery cells, calculates the value of at least one parameter constituting an equivalent circuit model using the voltage data of each of the plurality of battery cells corresponding to the target section, and diagnoses the state of each of the plurality of battery cells based on the value of the at least one parameter.
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