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arXiv 2101.04440eess.SYcs.SY
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电池容量快速衰减和寿命终止的数据驱动模型的自动特征提取和选择

Automated feature extraction and selection for data-driven models of rapid battery capacity fade and end of life

Samuel Greenbank, David A. Howey

摘要:

锂离子电池在使用寿命后期可能会经历快速退化,特别是在更极端的使用协议下。快速退化的开始被称为“拐点”,预测它对于电池的安全和经济可行的使用是重要的。我们提出了一种数据驱动的方法,该方法使用自动特征选择来为高斯过程回归模型生成输入,该模型估计电池健康状况的变化,从中可以预测整个容量衰减轨迹,拐点和寿命结束。特征选择过程灵活地适应不同的输入,并优先考虑那些影响退化的输入。对于所考虑的数据集,发现日历时间和在特定电压区域花费的时间对降解速率有很大影响。该方法对容量估计的中位均方根误差小于1%,对拐点和寿命终点的中位预测误差分别为2.6%和1.3%。

英文摘要:

Lithium-ion cells may experience rapid degradation in later life, especially with more extreme usage protocols. The onset of rapid degradation is called the `knee point', and forecasting it is important for the safe and economically viable use for batteries. We propose a data-driven method that uses automated feature selection to produce inputs for a Gaussian process regression model that estimates changes in battery health, from which the entire capacity fade trajectory, knee point and end of life may be predicted. The feature selection procedure flexibly adapts to varying inputs and prioritises those that impact degradation. For the datasets considered, it was found that calendar time and time spent in specific voltage regions had a strong impact on degradation rate. The approach produced median root mean square errors on capacity estimates under 1\%, and also produced median knee point and end of life prediction errors of 2.6\% and 1.3\% respectively.

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