Battery Voltage Error Detection for Reliable Charge-Discharge Testing

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Solution Overview

Problem

Existing battery management systems struggle to distinguish between true defects and false defects in battery charge and discharge tests, leading to inaccurate performance evaluation.

Innovation Solution

A battery management device and method that corrects voltage measurement values by analyzing voltage difference patterns to identify errors in the measurement process, distinguishing between equipment-related errors and battery defects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If voltage measurement values are obtained during battery charge and discharge tests, then battery performance evaluation can be conducted, but it becomes difficult to distinguish between true battery defects and false defects caused by measurement errors

Engineering Contradiction:

Improvebattery performance evaluation reliabilityVSAvoidvoltage measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by calculating the average rate of change of voltage values before comparing individual measurements against this baseline. This pre-computed reference enables the system to proactively identify deviations that indicate measurement errors, allowing correction before final defect determination is made

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by continuously monitoring voltage difference values and comparing them against threshold values. When deviations are detected, the system uses the average rate of change as a reference to determine whether corrections are needed, creating a closed-loop system that self-adjusts for measurement errors while maintaining accurate defect detection

Inventive Principle:

Principle #23Feedback

2Productivity

If voltage measurements are taken at regular time intervals, then battery behavior can be monitored, but measurement errors may occur that lead to false defect identification

Engineering Contradiction:

Improvebattery testing efficiencyVSAvoiddefect detection accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system continuously compares voltage difference values against threshold values and uses feedback from the average rate of change to determine whether measured deviations represent true defects or measurement errors. This feedback mechanism maintains high testing efficiency while filtering out false positives

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the parameter perspective by shifting from absolute voltage value analysis to rate-of-change analysis. By deriving and comparing voltage difference values based on the average rate of change, the system transforms the measurement approach to inherently filter out certain types of measurement errors while preserving true defect detection

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4682558A1Battery management device, battery management method, and battery charge and discharge system

Publication Date: 2026.01.21 LG ENERGY SOLUTION LTD

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AI summary

A battery management device includes: an interface that obtains voltage measurement values generated by measuring voltage from a battery at regular time intervals within a first time period; and a controller that: derives an average rate of change of the voltage measurement values during the first time period; compares the voltage measurement values with corresponding values according to the average rate of change to derive voltage difference values during the first time period; and determines whether an error exists in the voltage measurement values during the first time period based on the voltage difference values.