Lead-Acid Battery Life Estimation Using DOD-Corrected Capacity Turnover
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Solution Overview
Problem
Conventional lead-acid battery life prediction methods fail to accurately estimate the remaining life by not considering the depth of discharge (DOD) and its impact on deterioration factors like softening and sulfation, leading to inaccurate capacity turnover value calculations.
Innovation Solution
A lead-acid battery system and method that calculates the capacity turnover value during operation using a DOD-based correction coefficient, considering the DOD and average C rate to account for the progression of deterioration, thereby accurately estimating the remaining battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lead-acid battery life prediction methods are used that integrate charged electricity amount from charge current value, then the prediction method is simple to implement, but the remaining life estimation accuracy is insufficient because DOD and its impact on deterioration factors are not considered
Solution Approach 1:
The patent introduces DOD-based correction coefficients that modify the capacity turnover value calculation based on the depth of discharge. By changing the calculation parameters to include DOD effects on softening and sulfation, the system achieves more accurate remaining life estimation without requiring complex additional hardware
Solution Approach 2:
The patent replaces simple electrical integration methods with a corrected calculation approach that accounts for chemical deterioration mechanisms. Instead of merely integrating charge current, the system substitutes this with a corrected capacity turnover value that incorporates DOD-based correction coefficients reflecting softening and sulfation effects
2Measurement precision
If the capacity turnover value is calculated without considering DOD, then the calculation is straightforward, but the capacity turnover value does not accurately reflect the actual battery deterioration state
Solution Approach 1:
The patent modifies the capacity turnover value calculation by introducing DOD-based correction coefficients. These coefficients adjust the calculation to reflect actual deterioration by considering the depth of discharge, transforming the simple capacity ratio into a more accurate deterioration indicator
Solution Approach 2:
The system uses DOD information as feedback to continuously correct the capacity turnover value. By monitoring discharge depth and applying appropriate correction coefficients, the system dynamically adjusts the deterioration assessment to match actual battery conditions
Data Source
AI summary
Described are a lead-acid battery system and a lead-acid battery life estimation method capable of accurately estimating a remaining life of a lead-acid battery by calculating a capacity turnover value during operation in consideration of a magnitude of a depth of discharge (DOD). The lead-acid battery system estimates the remaining life by comparing a capacity turnover value from the beginning to the end of life with the capacity turnover value during operation. The lead-acid battery system includes a capacity turnover value calculation unit that calculates the capacity turnover value during operation. The capacity turnover value calculation unit calculates the capacity turnover value during operation using a DOD-based correction coefficient calculated based on the DOD, which is calculated by dividing an integrated discharge capacity after the start of the discharge of the lead-acid battery by a rated capacity of the lead-acid battery.