Battery Deterioration Measurement via Voltage Trend Analysis
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Solution Overview
Problem
Current methods for measuring battery deterioration in electric vehicles are inaccurate due to technical difficulties in applying fixed frequencies and measuring impedance only under specific conditions, leading to errors in driving distance estimation.
Innovation Solution
A method using a Battery Management System (BMS) to measure battery deterioration by analyzing the change in average voltage values at each current point and the inclination of trend lines, allowing for real-time monitoring and accurate assessment of battery health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance measurement is performed using fixed frequency components, then measurement method is established, but measurement can only be performed under specific conditions (charging or specific state)
Solution Approach 1:
The patent changes the measurement parameters from fixed frequency impedance to voltage measurements at multiple current value points. This allows the measurement to be performed under various operating conditions (different current levels) rather than requiring specific conditions like charging state, thereby improving adaptability while maintaining measurement accuracy through multi-point voltage sampling and averaging
Solution Approach 2:
The patent introduces dynamic measurement capability by performing voltage measurements at multiple different current value points and calculating average values. This dynamic approach across varying current conditions enables continuous deterioration assessment during normal vehicle operation, not just under static specific conditions
2Measurement precision
If multiple frequency components are applied to measure impedance, then deterioration measurement is possible, but the algorithm becomes complex and difficult to implement in embedded systems
Solution Approach 1:
The patent extracts the essential deterioration information by measuring voltage at multiple current value points and calculating average values, then uses the inclination of the trend line connecting these averages as the key indicator. This simplified extraction method avoids complex multi-frequency impedance analysis while capturing the essential deterioration trend through a straightforward linear regression approach
Solution Approach 2:
The patent replaces the complex electrical impedance measurement system with a simpler voltage-current relationship analysis. Instead of applying multiple frequency components and analyzing impedance spectra, the system uses direct voltage measurements at various current points and determines deterioration from the slope of the resulting trend line, significantly reducing computational complexity
3Measurement precision
If impedance measurement is performed, then deterioration degree can be measured, but measurement is limited to specific conditions only
Solution Approach 1:
The patent creates a universal measurement method that works across multiple operating conditions by measuring voltage at various current value points. The system can perform deterioration assessment during discharge, charge, and different load conditions, making it multi-functional and applicable throughout the battery's entire operating range rather than being limited to specific conditions
Data Source
AI summary
A method of measuring a deterioration degree of a battery is provided for an electric vehicle. In particular, a Battery Management System (BMS) of a vehicle measures a deterioration degree of a battery by using a change amount of average values of voltage values measured at each current value point or a trend line connecting the average values of the voltage values in a predetermined current value section.