Battery Health Prediction Using Verified Simulation Data
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Solution Overview
Problem
Current battery management systems (BMS) struggle to reliably predict the state of health (SOH) of lithium-ion batteries due to variations in internal characteristics and the difficulty in obtaining accurate data on natural aging and temperature changes, especially in medium and large battery packs for hybrid vehicles and Energy Storage Systems.
Innovation Solution
A method using numerical simulation data, where a verified database is created through electrical and chemical analysis, and a machine learning algorithm is employed to predict SOH by counting charges or discharges, and stopping charging or discharging when deviations exceed preset limits, utilizing models like Species Transport, Electronic Potential, and Energy Balance Models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real laboratory experiments are conducted to obtain predicted data on battery aging and temperature changes, then measurement precision may be improved, but loss of time and cost increase significantly
Solution Approach 1:
The patent creates a virtual copy of the battery system through numerical simulation models that replicate the physical battery's electrochemical behavior, thermal characteristics, and aging processes. This digital twin approach allows obtaining prediction data without conducting lengthy physical experiments, thus maintaining measurement precision while dramatically reducing time loss.
Solution Approach 2:
The patent replaces the mechanical/physical experiment system with a computational simulation system. Instead of conducting actual battery cycling tests that take months or years, the system uses numerical models solved by computers to predict battery behavior, substituting physical experimentation with mathematical simulation to achieve the same predictive goals efficiently.
2Loss of time
If numerical simulation is used to predict battery state of health, then loss of time is reduced, but reliability may be compromised without proper verification
Solution Approach 1:
The patent implements a feedback mechanism where numerical simulation results are continuously verified and calibrated against actual experimental data. The simulation model parameters are adjusted based on comparisons with measured battery behavior, ensuring that the time-efficient simulation maintains high reliability by learning from and adapting to real-world observations.
Solution Approach 2:
The patent performs preliminary verification of the numerical simulation model against experimental data before using it for predictions. By pre-calibrating and validating the simulation parameters using a subset of experimental data, the system ensures that subsequent time-efficient simulations will produce reliable predictions without needing to re-run lengthy experiments each time.
3Reliability
If battery management system monitors all cells in real time, then reliability is improved, but device complexity increases due to managing individual cell variations
Solution Approach 1:
The patent develops a universal numerical simulation model that can predict the behavior of different battery cells with varying characteristics using a single framework. This multi-functional model accommodates cell-to-cell variations by adjusting input parameters rather than requiring separate management systems for each cell, thus maintaining reliability while reducing overall system complexity.
Solution Approach 2:
The patent manages individual cell variations by changing simulation parameters (such as initial capacity, internal resistance, aging rate) within the unified numerical model rather than creating separate management systems. This approach allows the system to adapt to different cell characteristics through parameter adjustment, simplifying the management architecture while maintaining accurate prediction capability for each cell.
Data Source
AI summary
The present invention relates to a method for predicting the state of health of a battery based on numerical simulation data. A method for predicting the state of health of a battery, which is performed by a battery management system, according to an embodiment of the present invention includes: a step of obtaining a verified numerical simulation database, into which solution data of the battery is extracted and stored, when a numerical analysis result is verified by an experimental result using electrical and chemical analysis of the battery; a step of counting the number of charges or discharges when a deviation between reference data read from the verified numerical simulation database and measurement data read from the battery is within a preset range and battery capacity satisfies a preset condition; and a step of predicting a state of health of the battery using the number of charges or discharges and a classifier based on a learned machine learning algorithm.


