Battery Information Processing System Using Eight-Constant Equivalent Circuit Model
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Solution Overview
Problem
Existing methods for evaluating the characteristics of battery modules, particularly in large-scale scenarios, face challenges due to the complexity of precise equivalent circuit models, which require extensive time for analysis and are impractical for rapid evaluation of numerous modules.
Innovation Solution
A battery information processing system using an equivalent circuit model with eight simplified circuit constants (junction inductance, junction resistance, solution resistance, charge transfer resistance, diffusion resistance, and electric double layer capacitance) to accurately evaluate the AC impedance of battery modules, allowing for efficient calculation of full charge capacity and internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an academically precise equivalent circuit model is adopted to improve accuracy in evaluation of battery module characteristics, then measurement precision is improved, but analysis time increases significantly making it unrealistic for large-scale evaluation scenarios
Solution Approach 1:
The patent changes the parameters of the equivalent circuit model by reducing the number of circuit constants from many (in precise models) to exactly eight specific constants. This parameter reduction maintains the ability to accurately represent battery module AC impedance characteristics while significantly decreasing the computational complexity and analysis time required for fitting processing.
Solution Approach 2:
The patent extracts only the essential eight circuit constants that are most critical for representing battery module characteristics from the complete set of circuit constants in precise equivalent circuit models. This extraction process removes unnecessary complexity while retaining the core functionality needed for accurate evaluation of full charge capacity and other characteristics.
2Productivity
If an excessively simplified equivalent circuit model is adopted to reduce analysis time, then productivity is improved, but measurement precision deteriorates making accurate evaluation impossible
Solution Approach 1:
The patent optimizes the parameters of the equivalent circuit model by selecting exactly eight specific circuit constants that strike the optimal balance between model simplicity and evaluation accuracy. This parameter configuration enables rapid fitting processing while maintaining sufficient precision for practical battery module characterization in large-scale scenarios.
Data Source
AI summary
A battery information processing system includes a storage device configured to store an equivalent circuit model which expresses an AC impedance of a battery module with a plurality of circuit constants. The plurality of circuit constants include first to eighth circuit constants. The first circuit constant is a junction inductance.The second circuit constant is a junction resistance. The third circuit constant is a solution resistance and the fourth circuit constant is a charge transfer resistance. The fifth circuit constant is a CPE index of a diffusion resistance. The sixth circuit constant is a CPE constant of the diffusion resistance. The seventh circuit constant is a CPE index of an electric double layer capacitance. The eighth circuit constant is a CPE constant of the electric double layer capacitance.