预言
电池(电)
可靠性工程
计算机科学
电压
统计分析
汽车工程
工程类
电气工程
统计
数学
物理
功率(物理)
量子力学
作者
Fangfang Yang,Lu Zhang,Xiaojun Tan,Kwok Leung Tsui,Dong Wang
标识
DOI:10.1016/j.ymssp.2024.111140
摘要
Accurately estimating battery health status is crucial to ensure safe battery operation. The data-driven estimation methods proposed in current literature typically require complete sets of voltage, current, temperature data throughout battery charge/discharge process. However, obtaining such comprehensive data in real-world applications is often impractical. In this paper, we propose to estimate the health status of commercial lithium-ion batteries based on statistical features derived from voltage data within a specific voltage interval. Our emphasis on voltage data is grounded in the wealth of information voltage curves usually provide for battery prognostics. To implement our approach, the time-sampled battery data is first converted into voltage-sampled data series via resampling using cubic splines. Then, a set of statistical features is constructed based on ΔQV statistics and incremental capacity analysis, aiming to capture more effective voltage information from both cycle and discharge time dimensions. The extracted features are then studied considering battery degradation mechanisms, different battery materials, and the choice of voltage interval. The proposed methodology is tested on both lithium iron phosphate batteries and lithium nickel manganese cobalt oxide batteries, and experimental results demonstrate that the ΔQV statistics perform more reliably and robustly than incremental capacity features. In addition, the mean, minimum, and variance are highly correlated with battery capacity, while higher-order moments such as skewness and kurtosis present insignificant impacts. Compared to estimation based on all discharge data, estimation based on partial voltage information yield very competitive results, with all root mean square errors less than 1%.
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