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Expanding the lifetime of Li-ion batteries through optimization of charging profiles

机译：通过优化充电轮廓来扩展锂离子电池的寿命

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摘要

The increasing penetration of renewable energy sources, incentivized by government policies and decreasing costs, brings the challenge of making electricity supply and consumption meet, as these energy sources are intermittent by nature. Li-ion battery systems integrated in the grid will provide much needed ancillary services, such as frequency regulation, peak shaving and load levelling, so that the challenges of future cleaner grids can be properly addressed. Therefore, efforts on all fronts are being made to further reduce the price of operation, materials and production of Li-ion battery systems. In this research, we propose an optimization of the conventional CC-CV charging protocol typically used in Li-ion batteries. The proposed protocol aims at expanding the lifetime of the system. A reduced-order electrochemical model for a Li-ion cell is used to simulate its dynamic behavior. Additionally, an optimization algorithm is developed and coupled to the dynamic model to obtain optimal charging discharging profiles that maximizes the cell lifetime. A charging protocol that combines two different charging profiles proved to be an easily implementable and effective way of increasing the cell life time by ca. 27% in these simulations, in comparison to the standard CC-CV protocol. (C) 2019 Elsevier Ltd. All rights reserved.
机译：通过政府政策的可再生能源的普及率越来越多，因为这些能源因性质间歇性而导致电力供应和消费符合迎接电力供应和消费的挑战。集成在网格中的锂离子电池系统将提供频率调节，峰值剃须和载荷调平的锂离子电池系统，使未来清洁网格的挑战可以正确解决。因此，正在进行所有前端的努力，以进一步降低锂离子电池系统的运行，材料和生产价格。在本研究中，我们提出了通常在锂离子电池中使用的传统CC-CV充电方案的优化。拟议的协议旨在扩大系统的寿命。用于锂离子电池的减小的电化学模型用于模拟其动态行为。另外，开发了一种优化算法和耦合到动态模型，以获得最大化细胞寿命的最佳充电放电轮廓。结合两个不同的充电轮廓的充电协议被证明是一种易于实现CA增加细胞寿命时间的有效方法。与标准CC-CV协议相比，这些模拟中的27％。 （c）2019 Elsevier Ltd.保留所有权利。

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