A Parametric Open Circuit Voltage Model for Lithium Ion Batteries
A Parametric Open Circuit Voltage Model for Lithium Ion Batteries
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DOI：
10.1149/2.0331512jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Howey, D. A.
中科院分区：
文献类型：
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作者：
Birkl, C. R.;McTurk, E.;Howey, D. A.
我们提出了锂离子 (Li-ion) 电池的开路电压 (OCV) 模型，该模型可以通过测量正极和负极半电池以及全电池的 OCV 来参数化。不需要预先了解与特定细胞化学相关的物理参数。全电池的 OCV 由两个电极子模型计算得出，这些子模型由代表活性电极材料相变的附加项组成。该模型结构灵活，可应用于任何锂离子电池化学。该模型可以解释 OCV 的温度依赖性和电压迟滞。将模型与锂离子电池在 0 摄氏度、10 摄氏度下记录的 OCV 数据进行拟合； 20 摄氏度、30 摄氏度和 40 摄氏度可实现高精度，误差 (RMS) 小于 5 mV。该模型可通过考虑容量衰减对 OCV 的影响来保持电池管理系统中动态锂离子电池模型的准确性。此外，该模型提供了一种将电池的 OCV 分离为其组成电极电势的方法，从而可以随着时间的推移单独跟踪电极的容量，从而深入了解作用于各个电极的普遍降解机制。 (C) 作者 2015 年。ECS 出版。
We present an open circuit voltage (OCV) model for lithium ion (Li-ion) cells, which can be parameterized by measurements of the OCV of positive and negative electrode half-cells and a full cell. No prior knowledge of physical parameters related to particular cell chemistries is required. The OCV of the full cell is calculated from two electrode sub-models, which are comprised of additive terms that represent the phase transitions of the active electrode materials. The model structure is flexible and can be applied to any Li-ion cell chemistry. The model can account for temperature dependence and voltage hysteresis of the OCV. Fitting the model to OCV data recorded from a Li-ion cell at 0 degrees C, 10 degrees C; 20 degrees C, 30 degrees C and 40 degrees C yielded high accuracies with errors (RMS) of less than 5 mV. The model can be used to maintain the accuracy of dynamic Li-ion cell models in battery management systems by accounting for the effects of capacity fade on the OCV. Moreover, the model provides a means to separate the cell's OCV into its constituent electrode potentials, which allows the electrodes' capacities to be tracked separately over time, providing an insight into prevalent degradation mechanisms acting on the individual electrodes. (C) The Author(s) 2015. Published by ECS.