Battery State Estimation With Distributed Modeling and Validation
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Solution Overview
Problem
Current battery management systems face challenges in accurately estimating battery states, particularly in real-time, especially on compute-limited resources, and in validating models to ensure precision, while also optimizing the useful lifetime and economic value of battery systems.
Innovation Solution
A system and method that includes a computing system with a state estimator, simulation engine, and model generator, which distributes computation between remote and local systems to enhance battery state estimation, uses modular models to select and validate battery models based on application-specific criteria, and enables real-time monitoring and prediction of battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If battery state estimation is performed in real-time on compute-limited resources, then responsiveness and monitoring capability are improved, but measurement precision and accuracy deteriorate
Solution Approach 1:
The system divides battery state estimation into two segments: a simplified estimator running in real-time on compute-limited resources for responsiveness, and a comprehensive estimator running on more powerful systems for high-precision validation and model updates. This segmentation allows each component to operate within its computational constraints while achieving overall system accuracy.
Solution Approach 2:
A communication interface acts as an intermediary between the simplified real-time estimator and the comprehensive validation system. This intermediary transfers battery data and estimation results, enabling the real-time system to benefit from periodic validation and model updates without compromising its speed or real-time performance.
2Measurement precision
If complex validation and model updating procedures are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The validation and model updating functions are segmented from the real-time estimation core. The comprehensive estimator with complex validation procedures runs as a separate periodic task on more powerful systems, while the real-time estimator maintains a simpler, faster architecture. This segmentation reduces the complexity burden on the real-time system.
Solution Approach 2:
Complex validation and model updating are performed periodically rather than continuously. The comprehensive estimator validates and updates battery models at scheduled intervals, allowing the real-time system to maintain simple, fast estimation logic between updates. This periodic approach achieves high precision without continuously complicating the real-time system.
3Productivity
If distributed computation is used between remote and local systems, then productivity and real-time monitoring are improved, but device complexity increases
Solution Approach 1:
The system segments computation tasks between local and remote systems based on their capabilities. The local system handles time-critical real-time estimation with simplified algorithms, while the remote system performs computationally intensive validation, model updating, and historical analysis. This segmentation optimizes productivity by utilizing available computational resources effectively.
Solution Approach 2:
A communication interface serves as an intermediary that coordinates data exchange between the local real-time estimator and the remote comprehensive validation system. This intermediary manages the distributed architecture by handling data transfer, synchronization, and coordination, enabling high productivity without requiring complex point-to-point connections between multiple components.
Data Source
AI summary
A system or method for determining a battery state can include generating a set of models based on a measured response of a plurality of batteries to an applied load, measuring battery properties of a battery, and using a state estimator to determine a battery state associated with a battery.