Rechargeable Battery OCV Correction for Early Degradation Assessment
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Solution Overview
Problem
Existing methods for evaluating the degradation state of rechargeable batteries require extensive data collection during normal operation and are inefficient in accurately assessing battery health, especially in the early stages of operation.
Innovation Solution
An information processing apparatus that estimates an OCV curve from operation data, corrects voltage values based on SoC, determines a suitable SoC range, and evaluates battery degradation using dispersion of corrected voltage values, enabling accurate assessment of battery health across a wide SoC range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If on-line evaluation of battery degradation is performed using normal operation data, then continuous monitoring without stopping operation is enabled, but extensive data collection is required which increases time and computational resources
Solution Approach 1:
The patent pre-calculates and stores OCV curves for various SoC values before actual battery operation. During operation, the system only needs to retrieve the pre-computed OCV curve corresponding to the current SoC and compare it with measured voltage, eliminating the need for extensive real-time data collection and computation while maintaining accurate degradation evaluation
Solution Approach 2:
Instead of requiring complete charge-discharge cycles or extensive operation data for evaluation, the patent uses partial data - specifically the relationship between voltage, SoC, and OCV at various states. By focusing on this key partial information and using dispersion analysis of corrected voltage values, the system achieves accurate degradation assessment without collecting excessive data
2Productivity
If traditional evaluation methods using approximation equations are used, then evaluation can be performed with minimal data, but accuracy of degradation assessment is reduced
Solution Approach 1:
The patent replaces traditional mechanical/mathematical approximation methods (like Arrhenius equations) with an electrical-based approach using OCV curves and voltage dispersion analysis. This substitution enables more accurate degradation assessment by directly measuring electrical characteristics (voltage deviations from OCV) rather than relying on approximate mathematical models
Solution Approach 2:
The patent creates and stores reference OCV curves that represent ideal battery behavior at different SoC levels. During evaluation, these reference curves are copied and compared against actual measured voltage values. The dispersion between measured values and the copied reference OCV curve provides accurate degradation information without requiring complex approximation calculations
Data Source
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AI summary
[Problem to be solved] An information processing method, a computer program and an information processing system for evaluating the state of a rechargeable battery is provided. [Solution] According to one embodiment, an information processing apparatus includes: a first voltage corrector configured to correct a first voltage value of a rechargeable battery according to an amount of charged electricity of the rechargeable battery at the first voltage value to generate a second voltage value, the first voltage value including one of a charge voltage or discharge voltage; and a state evaluator configured to evaluate a state of the rechargeable battery based on the second voltage value.