Battery Energy Estimation from Stepwise SOC and Weighted Power
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Solution Overview
Problem
Existing methods for calculating battery energy are complex, time-consuming, and dependent on specific test data, making it inconvenient to repeat tests when conditions change.
Innovation Solution
An apparatus and method that calculate battery energy by storing relationship information between stepwise state of charge (SOC) and battery characteristic information, and using a processor to calculate target SOCs, target battery characteristic information, and target powers based on this information, applying a weighted sum method to determine the battery energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discharge tests are performed at various SOHs and results are recorded in lookup tables or fitting functions, then battery energy calculation accuracy is improved, but test complexity and time consumption increase significantly
Solution Approach 1:
The patent transforms the complex test-based approach into a parameter-based calculation method. Instead of performing actual discharge tests at various SOH levels and storing results in lookup tables, the invention uses mathematical parameters (polynomial coefficients) to represent battery characteristics across different SOH states. This allows accurate battery energy calculation through parameter substitution rather than repeated physical testing, thereby maintaining measurement precision while dramatically reducing test complexity.
2Measurement precision
If discharge tests are repeated when test conditions change, then accurate battery energy data is obtained, but time consumption increases
Solution Approach 1:
The patent performs preliminary characterization of battery behavior across the full range of SOH states during initial battery development or calibration. Polynomial coefficients and other parameters are pre-calculated and stored in the battery management system. When test conditions change or battery energy calculation is needed, the system simply retrieves and applies the pre-stored parameters rather than repeating time-consuming discharge tests, thus maintaining data accuracy while eliminating repeated testing time.
3Loss of time
If lookup tables or fitting functions are used to store test results, then battery energy can be calculated without repeating tests, but dependency on specific test data remains and adaptability decreases
Solution Approach 1:
The patent creates a universal calculation framework using polynomial models that can represent battery characteristics across different SOH states, temperatures, and operating conditions. The same set of polynomial coefficients and calculation algorithms can be applied universally to calculate battery energy for any SOH level or test condition scenario. This eliminates dependency on condition-specific lookup tables while maintaining the ability to calculate battery energy without repeating tests, thereby achieving both time efficiency and adaptability.
Data Source
AI summary
An apparatus for calculating battery energy includes a memory storing relationship information between a stepwise state of charge (SOC) of a battery device and a plurality of battery characteristic information corresponding to each stepwise SOC, and a processor operatively coupled to the memory. The processor calculates target SOCs, each defined for preset nodes, target battery characteristic information, each defined for the nodes, based on the relationship information stored in the memory and the calculated target SOCs, target powers, each defined for the nodes, from the calculated target battery characteristic information, and energy of the battery device using a weighted sum method with respect to the target powers calculated. A corresponding method and computer-readable storage medium are also provided.