Accelerated Secondary Battery Lifetime Estimation via Parameter Changes
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Solution Overview
Problem
The existing methods for evaluating the cycle life of secondary batteries are time-consuming, particularly in the IT field where product cycles are short, necessitating a more efficient approach to reduce development time.
Innovation Solution
A device and method that utilize first and second battery life test data under different conditions to calculate an acceleration factor, allowing for the prediction of secondary battery lifetime by charging and discharging batteries at varying currents, temperatures, and voltages, thereby accelerating the evaluation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If charge and discharge operations are repeatedly performed under various conditions to evaluate cycle life, then the lifetime estimation accuracy is improved, but the evaluation time increases significantly
Solution Approach 1:
The patent applies parameter changes by conducting battery life tests under different conditions (different currents, temperatures, and voltages) to obtain multiple datasets. By varying these parameters and using regression analysis to determine acceleration factors, the system can estimate lifetime under normal conditions from accelerated test data, thereby reducing evaluation time while maintaining accuracy
Solution Approach 2:
The patent performs preliminary accelerated life tests under severe conditions (higher currents, temperatures, or voltages) to obtain degradation data faster. By conducting these preliminary actions under accelerated conditions and then using the determined acceleration factors to predict normal lifetime, the overall evaluation process is shortened without sacrificing estimation accuracy
2Productivity
If battery life tests are conducted under accelerated conditions with higher current, then the evaluation speed is improved, but the test complexity increases
Solution Approach 1:
The patent segments the evaluation process into distinct phases: conducting separate life tests under different accelerated conditions (different currents, temperatures, or voltages), analyzing each dataset separately to determine individual acceleration factors, and then combining these factors through regression analysis. This segmentation makes the complex accelerated testing process more manageable and systematic
Solution Approach 2:
The patent creates a universal acceleration factor determination method that can be applied across different battery types and test conditions. The regression analysis approach and acceleration factor calculation methodology serve multiple functions: they work for different current rates, temperatures, and voltages, making the system versatile and reducing overall test complexity through a unified analytical framework
Data Source
AI summary
Embodiments of the present invention provide an accelerated lifetime estimation device for predicting the lifetime of a secondary battery, and a method thereof. The accelerated lifetime estimation device can accurately estimate a normal lifetime of the secondary battery while reducing an evaluation time period of the secondary battery.