Battery Voltage Fitting Equation for Internal Short Detection

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Solution Overview

Problem

Existing methods for diagnosing abnormal voltage drops in batteries during charging are unable to detect instantaneous voltage drops caused by internal shorts.

Innovation Solution

An apparatus and method that utilize a fitting equation for the battery voltage to accurately and easily detect abnormal voltage drops due to internal shorts during charging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If voltage measurement method is used to detect abnormal voltage drop, then detection capability for overall voltage drop is improved, but detection capability for instantaneous voltage drop deteriorates

Engineering Contradiction:

Improvevoltage drop detection accuracyVSAvoidinstantaneous internal short detection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by calculating a fitting equation for the battery voltage curve before diagnosis. This pre-established mathematical model represents the normal voltage characteristics during charging, enabling the system to detect instantaneous deviations that would otherwise be missed by conventional measurement methods alone.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the conventional direct voltage measurement approach with a mathematical modeling approach using fitting equations. Instead of relying solely on physical voltage measurements, the system uses a calculated reference curve to compare against actual voltage data, enabling detection of instantaneous anomalies through mathematical deviation analysis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If conventional voltage measurement method is used, then detection simplicity is improved, but diagnostic accuracy for instantaneous drops deteriorates

Engineering Contradiction:

Improvedetection method simplicityVSAvoidinstantaneous voltage drop detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system performs preliminary calculation of the fitting equation that models normal battery voltage behavior during charging. This pre-established reference enables simple comparison operations during diagnosis, maintaining ease of operation while significantly improving detection accuracy for instantaneous voltage drops.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the approach from direct voltage threshold comparison to comparing actual voltage against a dynamically calculated fitting curve. This parameter transformation allows the system to detect instantaneous deviations more accurately while maintaining operational simplicity through automated mathematical comparison.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4016099B1Apparatus and method for diagnosing battery

Publication Date: 2025.04.16 LG ENERGY SOLUTION LTD

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AI summary

An apparatus for diagnosing a battery according to an embodiment of the present invention may include a voltage measurement unit that measures a voltage of a battery cell, a fitting equation calculation unit that calculates a fitting equation for the voltage of the battery cell, and a diagnostic unit that diagnoses whether or not the battery cell is abnormal based on the fitting equation for the voltage of the battery cell.