Battery Management Unit Using Multi-Model Terminal Voltage Fusion
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Solution Overview
Problem
Conventional methods for determining battery terminal voltage and performance fail to accurately reflect the diverse characteristics of batteries, particularly in electric vehicles, due to limitations in battery modeling.
Innovation Solution
A battery management unit that utilizes multiple models, including DC, AC, and OCV models, to estimate terminal voltage by fusing measurements and correcting them based on weights and covariances, enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single battery model is used to calculate terminal voltage, then the calculation process is simple, but the model fails to accurately reflect certain battery characteristics
Solution Approach 1:
The patent combines multiple battery models (first battery model and second battery model) into a unified terminal voltage calculation system. The processor calculates terminal voltage using both models and fuses the results, merging their respective strengths to achieve higher accuracy while maintaining computational feasibility through systematic integration.
Solution Approach 2:
The patent creates a composite modeling approach by integrating results from different battery models. Similar to composite materials combining different substances for superior properties, the system combines terminal voltage calculations from multiple models to achieve accuracy that exceeds any single model alone.
2Measurement precision
If multiple battery models are used to estimate terminal voltage, then the accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the terminal voltage calculation into distinct components: a first battery model for capturing specific characteristics and a second battery model for capturing other characteristics. This segmentation allows each model to specialize in certain aspects, improving overall accuracy while organizing the complexity into manageable, modular sections.
Solution Approach 2:
The patent implements dynamic model selection and fusion where the processor adaptively combines results from multiple battery models based on their respective strengths. The system dynamically adjusts which model contributes more to the final terminal voltage calculation, optimizing accuracy while managing computational complexity through adaptive rather than static integration.
Data Source
AI summary
A battery management unit and method are disclosed. The battery management unit includes a sensor, a first battery model, a second battery model, and a processor. The sensor measures a voltage of a battery. The first battery model and the second battery model are to estimate different characteristics of the battery based on a measurement voltage. The processor obtains a first terminal voltage corresponding to the measurement voltage based on the first battery model, obtains a second terminal voltage corresponding to the measurement voltage based on the second battery model, and fuses the first terminal voltage and the second terminal voltage to determine a final terminal voltage of battery.