Lead-Acid Battery Life Estimation Using Equalization Charge Correction
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Solution Overview
Problem
Conventional lead-acid battery life prediction methods fail to accurately estimate the remaining life due to the lack of consideration for factors such as the number of equalization charges and overcharge rate integrated values, which affect capacity turnover values and lead to inaccurate assessments of battery degradation.
Innovation Solution
A lead-acid battery system and method that calculates capacity turnover values during operation by using correction coefficients based on the number of equalization charges or overcharge rate integrated values, accounting for corrosion and material softening due to electrolyte loss, thereby providing a more accurate estimation of remaining battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional capacity turnover value calculation methods are used, then the calculation process is simple, but the estimation accuracy of remaining battery life is insufficient
Solution Approach 1:
The patent introduces correction coefficients (K1 for equalization charges, K2 for overcharge rates) that modify the basic capacity turnover value calculation. These parameter changes account for degradation factors without requiring complete recalculation of the battery lifecycle, thus improving accuracy while maintaining calculation simplicity.
Solution Approach 2:
The patent uses correction coefficients as intermediary factors that bridge the simple capacity turnover value and the actual remaining life estimation. These coefficients mediate the impact of equalization charges and overcharge rates, allowing complex degradation effects to be incorporated through relatively simple multiplicative adjustments.
2Measurement precision
If factors such as equalization charges and overcharge rates are considered, then the accuracy of battery degradation assessment is improved, but the calculation complexity increases
Solution Approach 1:
The patent incorporates equalization charge counts and overcharge rate integrals as additional parameters that modify the capacity turnover value through correction coefficients. This approach allows comprehensive degradation assessment by adjusting key parameters rather than implementing completely complex calculation models.
Solution Approach 2:
The patent segments the degradation assessment into distinct components: base capacity turnover value, equalization charge effect (with coefficient K1), and overcharge rate effect (with coefficient K2). This segmentation allows each factor to be calculated and applied separately, simplifying the overall complex calculation process.
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 the number of equalization charges of the lead-acid battery or an overcharge rate integrated value of the equalization charge of the lead-acid battery. The lead-acid battery system estimates the remaining life of the lead-acid battery by comparing a capacity turnover value from the beginning of life to the end of life with the capacity turnover value during operation. A capacity turnover value calculation unit in the lead-acid battery system calculates the capacity turnover value during operation by using an equalization-charge-number-based correction coefficient KCN calculated based on the number of equalization charges or a charge-rate-based correction coefficient KCP calculated based on the overcharge rate integrated value of the equalization charge.