Battery Equivalent Circuit Model Sub-Circuit Segmentation
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Solution Overview
Problem
Current battery modeling and simulation methods lack consistency with physiochemical processes, leading to inaccurate predictions of battery state and performance, especially under varying conditions and for degraded cells, and fail to adequately replicate specific battery processes.
Innovation Solution
A computer-implemented method for modeling and simulating batteries using an equivalent electric circuit model that includes sub-circuit models of the cathode and anode, comprising current inlets, voltage sources, resistors, and capacitance, which are arranged to replicate physiochemical processes and electrochemical reactions, allowing for accurate simulation of battery behavior and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery modeling methods are used, then the model structure is simple, but the model lacks consistency with physiochemical processes leading to inaccurate predictions
Solution Approach 1:
The battery model is segmented into multiple sub-circuit models, each representing specific battery components (electrodes, electrolyte, interfaces). This segmentation allows each sub-model to capture specific physiochemical processes independently, improving overall prediction accuracy while maintaining manageable complexity through modular structure
Solution Approach 2:
Electric circuit elements (resistors, capacitors, voltage sources) are introduced as intermediary components to represent and simulate physiochemical processes. These circuit elements act as mediators that translate complex electrochemical behaviors into equivalent electrical responses, enabling accurate prediction of battery state and performance
2Measurement precision
If detailed sub-circuit models are implemented to replicate physiochemical processes, then simulation accuracy improves, but computational complexity increases
Solution Approach 1:
Different sub-circuit models are designed with specific local qualities to represent different battery components and processes. Each sub-model contains circuit elements with parameters optimized for its specific function (e.g., diffusion resistance in electrodes, double-layer capacitance at interfaces), enabling precise local simulation that contributes to overall accuracy without requiring uniform complexity throughout the entire model
Solution Approach 2:
The model uses parameter changes to represent dynamic battery states and degradation. Circuit element parameters (resistances, capacitances, voltage sources) are adjusted based on state of charge, temperature, and age, allowing the model to accurately capture transient behaviors and degradation effects while maintaining a relatively simple fixed circuit topology
Data Source
AI summary
A method for modeling, simulating, or emulating a battery may include generating an equivalent electric circuit model of a battery. The equivalent electric circuit model may include models of the battery's cathode and anode. At least one of the models of the cathode and anode may comprise one or more sub-circuit models. A sub-circuit model may comprise a first current inlet, a second current inlet, at least one voltage source, one or more resistors, and a capacitance. A first current path may be arranged between the first current inlet and the second current inlet. The at least one voltage source and the one or more resistors may be arranged in series in the first current path. A second current path may be arranged in parallel to the first current path between the first current inlet and the second current inlet. The capacitance may be arranged in the second current path.