A Li-Ion Battery Charge Protocol with Optimal Aging-Quality of Service Trade-off

Yukai Chen, Alberto Bocca, A. Macii, E. Macii, M. Poncino
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引用次数: 9

Abstract

The reduction of usable capacity of rechargeable batteries can be mitigated during the charge process by acting on some stress factors, namely, the average state-of-charge (SOC) and the charge current. Larger values of these quantities cause an increased degradation of battery capacity, so it would be desirable to keep both as low as possible, which is obviously in contrast with the objective of a fast charge. However, by exploiting the fact that in most battery-powered systems the time during which it is plugged for charging largely exceeds the time required to charge, it is possible to devise appropriate charge protocols that achieve a good balance between fast charge and aging. In this paper we propose a charge protocol that, using an accurate estimate of the charging time of a battery and the statistical properties of the charge/discharge patterns, yields an optimal trade-off between aging and quality of service. The latter is measured in terms of the distance of the actual SOC from 100% at the end of the charge phase. Results show that the present method improves significantly over other similar protocols proposed in the literature.
一种最优老化-服务质量权衡的锂离子电池充电协议
在充电过程中,可充电电池可用容量的减少可以通过作用于平均荷电状态(SOC)和充电电流等应力因子来缓解。这些量的较大值会导致电池容量的退化增加,因此希望将这两个量保持尽可能低,这显然与快速充电的目标相反。然而,通过利用在大多数电池供电系统中插入充电的时间大大超过充电所需的时间这一事实,有可能设计出适当的充电协议,在快速充电和老化之间取得良好的平衡。在本文中,我们提出了一种充电协议,该协议使用电池充电时间的准确估计和充电/放电模式的统计特性,在老化和服务质量之间产生最佳权衡。后者是根据充电阶段结束时实际SOC与100%的距离来测量的。结果表明,与文献中提出的其他类似协议相比,该方法有明显改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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