A physically meaningful equivalent circuit network model of a lithium-ion battery accounting for local electrochemical and thermal behaviour, variable double layer capacitance and degradation
A physically meaningful equivalent circuit network model of a lithium-ion battery accounting for local electrochemical and thermal behaviour, variable double layer capacitance and degradation
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DOI：
10.1016/j.jpowsour.2016.05.051
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发表时间：
2016-09
影响因子：
9.2
通讯作者：
M. V. Srbik;M. Marinescu;R. Martinez-Botas;G. Offer
中科院分区：
文献类型：
--
作者：
M. V. Srbik;M. Marinescu;R. Martinez-Botas;G. Offer
提出了一种新颖的电路类比，对实际汽车操作条件下的电化学系统进行建模。该模型是针对锂离子电池开发的，基于伪二维电化学模型。尽管采用应用工程师熟悉的框架，但该模型本质上是电化学电池模型：所有变量都有直接的物理解释，并且可以通过模型变量（浓度、电位）直接访问电池的所有状态，以进行监测和控制系统设计。这是第一个直接跟踪细胞内物种进化的等效电路网络型模型。它解释了在线电池性能预测器中通常忽略的复杂电化学现象，例如可变双层电容、完整的电流-过电势关系以及由于质量传输限制而导致的过电势。耦合的电化学和热模型解释了由于活性物质损失而导致的容量衰减以及由于两个电极处的电阻性固体电解质钝化层的增加而导致的功率衰减。该模型模拟动态事件下电池行为的能力已根据测试程序进行了验证，例如电流速率高达 20 C 的标准电池测试负载循环，以及实际的汽车驾驶循环负载。
A novel electrical circuit analogy is proposed modelling electrochemical systems under realistic automotive operation conditions. The model is developed for a lithium ion battery and is based on a pseudo 2D electrochemical model. Although cast in the framework familiar to application engineers, the model is essentially an electrochemical battery model: all variables have a direct physical interpretation and there is direct access to all states of the cell via the model variables (concentrations, potentials) for monitoring and control systems design. This is the first Equivalent Circuit Network -type model that tracks directly the evolution of species inside the cell. It accounts for complex electrochemical phenomena that are usually omitted in online battery performance predictors such as variable double layer capacitance, the full current-overpotential relation and overpotentials due to mass transport limitations. The coupled electrochemical and thermal model accounts for capacity fade via a loss in active species and for power fade via an increase in resistive solid electrolyte passivation layers at both electrodes. The model’s capability to simulate cell behaviour under dynamic events is validated against test procedures, such as standard battery testing load cycles for current rates up to 20 C, as well as realistic automotive drive cycle loads.