Battery State Estimation With Adaptive Aging Parameter Updates
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Solution Overview
Problem
Existing battery management systems struggle to accurately estimate the state of batteries, particularly in environments that accelerate aging, such as fast charging, fast discharging, low-temperature, or high-temperature conditions, as they fail to account for varying aging patterns based on user usage and environmental factors.
Innovation Solution
A method and apparatus that utilize an electrochemical model to estimate battery aging by measuring and comparing actual and estimated voltages, updating aging parameters such as anodic SEI resistance, cathode active material capacity, and electrode balance shift, using a corrector to minimize voltage differences and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery management methods (current integration or simple battery models) are used, then the system is simple and easy to implement, but the accuracy of battery state estimation deteriorates under accelerated aging conditions
Solution Approach 1:
The patent implements a feedback mechanism where the estimated voltage from the electrochemical model is continuously compared with the measured voltage, and the aging parameters are updated based on the voltage difference. This feedback loop enables the system to adapt to battery aging while maintaining accurate state estimation.
Solution Approach 2:
The electrochemical model automatically updates its own aging parameters by comparing its estimated voltage with actual measured voltage, enabling the system to self-correct and adapt to battery aging without external intervention. The model serves itself by using its own output (estimated voltage) to improve its accuracy.
2Productivity
If fast charging or fast discharging is performed to increase productivity, then charging/discharging speed improves, but battery aging accelerates and state estimation accuracy deteriorates
Solution Approach 1:
The patent employs a dynamic aging parameter update mechanism that continuously adapts the electrochemical model to current battery conditions. During fast charging or discharging, the model dynamically adjusts aging parameters based on real-time voltage comparisons, enabling accurate state estimation even under rapidly changing conditions that accelerate aging.
3Measurement precision
If electrochemical models with fixed aging parameters are used, then the model structure remains simple, but the model accuracy deteriorates as battery aging progresses
Solution Approach 1:
The patent changes the aging parameters of the electrochemical model based on the difference between estimated and measured voltages. By dynamically adjusting parameters such as resistance and capacity based on voltage deviations, the model adapts to battery aging while maintaining structural simplicity and computational efficiency.
Data Source
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AI summary
A method and apparatus for estimating a state of a battery. The method includes obtaining a measured voltage of a battery from a sensor connected to the battery, obtaining an estimated voltage of the battery from an electrochemical model stored in a memory, estimating an aging variation of the battery based on the measured voltage and the estimated voltage, and updating an aging parameter of the electrochemical model using the aging variation.