Secondary Battery Idle Life Evaluation Using Acceleration Factor
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Solution Overview
Problem
Existing methods for evaluating the idle life of secondary batteries are inefficient, requiring long times due to low idle temperatures and prolonged measurement cycles, making it difficult to obtain results quickly, especially for large-capacity applications like electric vehicles and energy storage systems.
Innovation Solution
A method and device that evaluate the accelerated idle life of secondary batteries by inputting idle temperature and measurement period conditions, computing an evaluation period for reaching a specific state of health, and calculating an acceleration factor using the direct current internal resistance change rate and capacity degradation rate, with the device comprising an input unit, data computation unit, and acceleration factor calculation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low idle temperature and prolonged measurement cycles are used for evaluation, then measurement reliability is improved, but evaluation time is excessively long
Solution Approach 1:
The patent applies parameter changes by adjusting the idle temperature to an accelerated range (40°C to 60°C) and modifying the measurement cycle frequency (measuring every 10 to 30 days instead of longer intervals). This allows the evaluation to maintain reliability through proper parameter selection while significantly reducing the total evaluation time from 8 months to 4 months or less.
2Measurement precision
If traditional idle life evaluation methods are used, then comprehensive battery degradation is measured, but the evaluation process requires approximately 8 months
Solution Approach 1:
The patent changes the temperature parameter to an accelerated idle temperature range (40°C to 60°C) which accelerates battery degradation processes while maintaining measurement accuracy. This allows comprehensive degradation assessment to be completed in 4 months or less instead of 8 months, thereby improving evaluation efficiency without sacrificing measurement precision.
Solution Approach 2:
The patent implements periodic measurement action by evaluating battery performance at regular intervals (every 10 to 30 days) during the accelerated idle period. This periodic approach captures degradation trends efficiently while reducing the overall evaluation time, achieving both comprehensive measurement and improved productivity.
3Productivity
If accelerated temperature conditions are applied, then evaluation time is reduced, but measurement reliability may be compromised
Solution Approach 1:
The patent carefully selects the accelerated temperature parameter within the optimal range of 40°C to 60°C, which is high enough to accelerate degradation and reduce evaluation time to 4 months or less, but controlled enough to maintain measurement reliability. This precise parameter control resolves the contradiction between evaluation speed and reliability.
Data Source
AI summary
A method for evaluating an accelerated idle life of a secondary battery, includes an evaluation condition input process including inputting an idle temperature and a measurement period for a reference performance test to evaluate the accelerated idle life of the secondary battery, a data computation process including computing an evaluation period, in which a state of health of the secondary battery reaches a set range, a capacity degradation rate, and a direct current internal resistance change rate, and an acceleration factor calculation process including calculating an acceleration factor of the secondary battery using a first equation that the acceleration factor is equal to the direct current internal resistance change rate divided by a capacity degradation rate.