Battery State of Health Estimation via Terminal Voltage
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Solution Overview
Problem
Existing battery state of health (SOH) estimation methods are application-dependent and lack universality, failing to provide accurate predictions of battery performance degradation across various usage scenarios.
Innovation Solution
A system and method that utilizes battery terminal voltage as a surrogate for static capacity and SOH, independent of specific applications, by comparing measured terminal voltage under non-zero load to stored test data, allowing for application-independent SOH estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If application-dependent statistical models are used for SOH estimation, then accuracy within specific applications is improved, but universality across different applications deteriorates
Solution Approach 1:
The patent applies universality by developing a SOH estimation method based on terminal voltage characteristics that can be applied across multiple battery applications and usage scenarios. The method uses universal relationships between terminal voltage, load current, and battery capacity that hold true regardless of specific application requirements, enabling a single model to serve diverse purposes from portable electronics to vehicle batteries.
Solution Approach 2:
The patent utilizes parameter changes by transforming the SOH estimation approach from application-specific statistical models to a parameter-based method using terminal voltage and load current relationships. By changing the fundamental parameters used for estimation (from application-specific metrics to universal electrical parameters), the method achieves both accuracy and universality across different battery applications.
2Measurement precision
If complex statistical models are used for SOH estimation, then estimation accuracy is improved, but model complexity and data requirements deteriorate
Solution Approach 1:
The patent applies the extraction principle by isolating the key relationship between terminal voltage, load current, and battery capacity from complex statistical models. Instead of using comprehensive statistical models that require extensive data, the method extracts and utilizes the fundamental electrical relationship that terminal voltage under load is directly related to remaining capacity, simplifying the estimation approach while maintaining accuracy.
Solution Approach 2:
The patent uses copying by creating a simplified representation of battery capacity through terminal voltage measurements under controlled load conditions. Rather than directly measuring capacity or using complex models, the method copies the capacity information into the terminal voltage parameter, which can then be used for SOH estimation without requiring the original complex statistical models or extensive training data.
Data Source
AI summary
A system and method for providing an application-independent estimation of the state of health (SOH) of a battery. A battery terminal voltage, under a non-zero load, when a specific amount of charge has been drawn from the battery is compared to stored terminal voltage test data obtained under the same conditions. An estimate of SOH is provided in response to the comparison.