Battery SOH Calculation Using Charge Discharge Count Weights
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Solution Overview
Problem
Conventional methods for calculating the State of Health (SOH) of batteries are inaccurate due to current sensor offsets, especially when charge and discharge counts are uneven, leading to errors in final SOH estimation.
Innovation Solution
A method and device that measure current, voltage, and temperature for each charge and discharge operation, estimate State of Charge (SOC) changes, and calculate SOH based on these measurements, applying weights according to charge and discharge counts to accurately determine the final SOH, even when current sensors have offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SOH estimation methods are used with current sensors that have offsets, then the calculation process is simple, but the accuracy of SOH estimation deteriorates when charge and discharge counts are uneven
Solution Approach 1:
The patent segments the SOH calculation process into separate charge SOH and discharge SOH calculations, then combines them using charge and discharge counts as weights. This segmentation allows each calculation to be performed independently with proper offset handling, then integrated to produce the final accurate SOH value.
Solution Approach 2:
The patent introduces charge count and discharge count as additional parameters to modify the traditional SOH calculation. By using these count parameters as weights in the final SOH calculation, the system compensates for sensor offsets and uneven charge/discharge cycles, improving accuracy without requiring complex hardware modifications.
2Measurement precision
If charge and discharge SOH values are simply averaged, then the calculation is straightforward, but the final SOH value becomes inaccurate when charge and discharge counts differ
Solution Approach 1:
The patent transitions from a static simple averaging method to a dynamic weighted averaging method. The weights are dynamically determined based on the actual charge count and discharge count, allowing the calculation to adapt to the specific operational history of the battery and produce accurate results even when charge and discharge cycles are uneven.
Solution Approach 2:
The patent uses charge count and discharge count as feedback parameters to adjust the weighting in the final SOH calculation. This feedback mechanism ensures that the final SOH accurately reflects the actual battery usage pattern, compensating for sensor offsets and uneven cycling without requiring complex iterative procedures.
3Measurement precision
If current sensor offset is not compensated, then the measurement process remains simple, but the charge SOH and discharge SOH estimates become erroneous
Solution Approach 1:
The patent converts the harmful effect of current sensor offset into a beneficial compensation mechanism. By calculating charge SOH and discharge SOH separately and then combining them with weights based on charge and discharge counts, the system naturally compensates for the offset error, turning what would be a source of inaccuracy into a means of error correction.
Solution Approach 2:
The patent introduces charge count and discharge count as intermediary parameters that mediate between the raw current measurements and the final SOH calculation. These intermediaries allow the system to account for sensor offsets and uneven cycling without requiring direct measurement or compensation of the offset itself, simplifying the overall approach while maintaining accuracy.
Data Source
AI summary
The present disclosure relates to a battery aging state calculation method and device, and more particularly, to a battery aging state calculation method and device for calculating a (i.e., State of Health (SOH)) according to each execution operation and calculating a final battery SOH based on charge/discharge execution counts to improve the accuracy of the battery SOH.