Abstract
As the lithium-ion battery is widely applied, the reliability of the battery has become a high-profile content in recent years. Accurate estimation and prediction of state of health (SOH) and remaining useful life (RUL) prediction are crucial for battery management systems. In this paper, the core contribution is the construction of a data-driven model with the long short-term memory (LSTM) network applicable to the time-series regression prediction problem with the integration of two methods, data-driven methods and feature signal analysis. The input features of model are extracted from differential thermal voltammetry (DTV) curves, which could characterize the battery degradation characteristics, so that the accurate prediction of battery capacity fade could be accomplished. Firstly, the DTV curve is smoothed by the Savitzky-Golay filter, and six alternate features are selected based on the connection between DTV curves and battery degradation characteristics. Then, a correlation analysis method is used to further filter the input features and three features that are highly associated with capacity fade are selected as input into the data driven model. The LSTM neural network is trained by using the root mean square propagation (RMSprop) technique and the dropout technique. Finally, the data of four batteries with different health levels are deployed for model construction, verification and comparison. The results show that the proposed method has high accuracy in SOH and RUL prediction and the capacity rebound phenomenon can be accurately estimated. This method can greatly reduce the cost and complexity, and increase the practicability, which provides the basis and guidance for battery data collection and the application of cloud technology and digital twin.
Graphical abstract
摘要
随着锂离子电池的广泛应用, 电池的可靠性成为近年来备受瞩目的内容。准确估计和预测健康状态 (SOH) 和剩余使用寿命 (RUL) 预测对于电池管理系统至关重要。在本文中, 核心贡献是构建了一个适用于时间序列回归预测问题的 LSTM 网络的数据驱动模型, 集成了数据驱动方法和特征信号分析两种方法。从DTV曲线中提取模型的输入特征, 可以表征电池的退化特性, 从而实现对电池容量衰减的准确预测。首先, 通过 SG 滤波器对 DTV 曲线进行平滑处理, 并根据 DTV 曲线与电池劣化特性之间的联系选择 6 个替代特征。然后, 使用相关分析方法对输入特征进行进一步过滤, 选择与容量衰减高度相关的三个特征作为数据驱动模型的输入。 LSTM NN 通过使用均方根传播 (RMSprop) 技术和 dropout 技术进行训练。最后, 部署四种不同健康等级电池的数据, 进行模型构建、验证和比较。结果表明, 该方法在SOH和RUL预测中具有较高的准确率, 能够准确估计容量反弹现象。这种方法可以大大降低成本和复杂性, 增加实用性, 为电池数据采集以及云技术和数字孪生的应用提供依据和指导。
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This work was financially supported by the National Natural Science Foundation of China (No. 52102470) and the Science and Technology Development Project of Jilin province (No. 20200501012GX).
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Ma, B., Yu, HQ., Wang, WT. et al. State of health and remaining useful life prediction for lithium-ion batteries based on differential thermal voltammetry and a long and short memory neural network. Rare Met. 42, 885–901 (2023). https://doi.org/10.1007/s12598-022-02156-1
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DOI: https://doi.org/10.1007/s12598-022-02156-1