Lithium Battery Solid-Phase Concentration Correction by Voltage Feedback
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Solution Overview
Problem
Current methods for estimating solid phase concentration in lithium batteries are inaccurate, affecting the calculation of other performance parameters and leading to suboptimal battery performance in energy storage applications.
Innovation Solution
A method involving the establishment of an electrochemical model, iterative correction of solid phase concentration based on voltage differences and mean square errors between simulated and actual output voltages, using a gradient descent method to adjust the concentration until error thresholds are met, thereby improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrochemical formula or material parameters are used to predict solid phase concentration, then the determination process is simple, but the accuracy of solid phase concentration is insufficient
Solution Approach 1:
The patent implements feedback by iteratively comparing the simulated output voltage from the electrochemical model with the actual measured output voltage of the battery. The error between these two voltages is calculated and used to adjust the solid phase concentration in subsequent iterations, creating a closed-loop correction system that continuously improves accuracy.
Solution Approach 2:
The electrochemical model performs self-correction by using its own internal calculations. The model takes the measured voltage as input, calculates the error against its simulated voltage, and automatically adjusts the solid phase concentration parameter within itself without requiring external intervention or complex additional measurement devices.
2Measurement precision
If iterative correction is performed to improve solid phase concentration accuracy, then the calculation precision is improved, but the calculation time is increased
Solution Approach 1:
The patent applies partial action by performing iterative corrections only when necessary - specifically when the error between simulated and actual voltages exceeds a predetermined threshold. Once the error is within the threshold, the iteration stops, avoiding unnecessary additional calculations and saving time while maintaining sufficient accuracy.
Solution Approach 2:
The correction process dynamically adjusts the solid phase concentration parameter based on the voltage error. By changing this key parameter iteratively and observing the effect on voltage prediction accuracy, the system efficiently converges to the correct concentration value without requiring exhaustive search through all possible values.
Data Source
AI summary
The invention discloses a method, a system and a storage medium for solid-phase concentration correction of a lithium battery. The method includes establishing an electrochemical model of the lithium battery; initializing a solid phase concentration in the electrochemical model to be a first solid phase concentration; simulating the simulated output voltage of the lithium battery in a preset period according to the electrochemical model, the preset current and the first solid-phase concentration; acquiring the actual output voltage of the lithium battery in the preset period; calculating an error coefficient between the simulation output voltage and the actual output voltage, and presetting an error threshold corresponding to the error coefficient; and when the error coefficient is greater than the error threshold, performing iterative correction on the first solid phase concentration until the error coefficient is not greater than the error threshold, and outputting the corrected second solid phase concentration.