Secondary Battery Voltage Drop Analysis for Abnormal Deterioration

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Solution Overview

Problem

Existing systems fail to accurately detect abnormal deterioration in secondary batteries, which causes significant voltage drops during high-discharge currents, leading to underestimated travel or flight distances in vehicles and drones.

Innovation Solution

A system and method for determining the deterioration status of secondary batteries by measuring and analyzing battery temperature, current, and voltage, estimating charge capacity, and comparing measured and estimated voltage drop amounts during conforming discharge periods to detect abnormal deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the secondary battery is discharged at high current for rapid acceleration or rapid rise, then the power output is improved, but the battery voltage drops significantly and reaches the lower limit voltage early, resulting in shorter actual travel or flight distance

Engineering Contradiction:

Improvepower outputVSAvoidtravel distance

Core Design Contradiction:

PowerVSDuration of action of moving object

Solution Approach 1:

The system performs preliminary detection of abnormal deterioration by analyzing voltage drop characteristics during discharge. By detecting the deviation from normal voltage drop patterns before they cause critical failures, the system can take preventive actions such as adjusting discharge rates or notifying users, thereby avoiding the situation where high current discharge leads to premature voltage cutoff and reduced travel distance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors battery voltage during discharge and compares the actual voltage drop against expected voltage drop based on charge capacity. This feedback mechanism allows the system to detect abnormal deterioration in real-time and adjust operations accordingly, preventing the power output from causing excessive voltage drop that would prematurely reach the lower limit voltage

Inventive Principle:

Principle #23Feedback

2Ease of operation

If the battery voltage is used to estimate SOC and travel distance, then the estimation is simple, but the estimated distance becomes significantly shorter than actual distance when abnormal deterioration occurs

Engineering Contradiction:

Improveestimation simplicityVSAvoiddistance estimation accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system replaces the simple voltage-based SOC estimation with an improved method that uses voltage drop analysis during discharge. By substituting the direct voltage-SOC relationship with a more sophisticated analysis of voltage change patterns during controlled discharge, the system maintains ease of operation while significantly improving distance estimation accuracy for batteries with abnormal deterioration

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system changes the parameter used for SOC estimation from static battery voltage to dynamic voltage drop characteristics during discharge. By analyzing how voltage changes during discharge rather than relying on absolute voltage levels, the system can accurately estimate SOC and remaining distance even when abnormal deterioration has altered the battery's voltage characteristics

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If the battery is used without detecting abnormal deterioration, then the device operation is continuous, but unexpected battery failures occur due to significant voltage drops during high discharge current

Engineering Contradiction:

Improvecontinuous operationVSAvoidbattery reliability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The system performs preliminary detection of abnormal deterioration by analyzing voltage drop patterns during normal discharge operations. By detecting signs of electrolyte salt concentration reduction before they cause catastrophic failures, the system can maintain continuous operation through preventive measures while ensuring battery reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system rushes through the detection process by continuously monitoring voltage drop characteristics during regular discharge. This allows the system to quickly identify abnormal deterioration trends and take corrective action before unexpected failures occur, maintaining both continuous operation and high reliability

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS20250362356A1System and method for determining a deterioration status of a secondary battery

Publication Date: 2025.11.27 PRIME PLANET ENERGY & SOLUTIONS INC

AI summary

A deterioration status determination system includes a measuring unit that measures the battery temperature, battery current, and battery voltage, a storing unit, a capacity estimating unit that estimates the estimated charge capacity, a conforming discharge period detecting unit that detects a conforming discharge period in which a high C-rate discharge that conforms to discharge conditions is performed, a measured voltage drop acquiring unit that obtains a measured voltage drop amount that appears during the conforming discharge period, an estimated voltage drop acquiring unit that obtains an estimated voltage drop amount that is estimated to appear during the same period, and a determining unit that determines whether there is abnormal deterioration in the battery, from the measured voltage drop amount and the estimated voltage drop amount.