Nonlinear observability and identifiability of single cells in battery packs
Nonlinear observability and identifiability of single cells in battery packs
复制标题
电池组中单体电池的非线性可观测性和可识别性
DOI：
10.1109/cca.2013.6662782
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
R. Findeisen
中科院分区：
文献类型：
--
作者：
Matthias Rausch;S. Streif;C. Pankiewitz;R. Findeisen
锂离子电池目前在性能、能量密度和寿命等目标之间提供了最佳折衷。为了满足许多应用的需求，通常将大量的单个电池单元组合成电池模块或电池组。然而，单电池的荷电状态和参数的确定对于电池的可靠和安全操作是重要的。在本文中，我们调查的可观察性和可识别性的电池组中，实现了并联和串联连接的细胞。分析是基于线性和非线性可观性测试，利用等效电路模型。这导致结论性的发现，从集总测量估计单细胞的状态的可行性。如对于并联连接的电池所示，一个电压和一个电流传感器足以确定各个电池的充电状态和模型参数。仿真结果说明了这一点。
Lithium-ion batteries currently offer the best tradeoff between objectives like performance, energy density and lifetime. To serve the demands of many applications, often a large number of single battery cells are combined into modules or packs of batteries. However, the determination of state of charge and parameters of the single cells is important for the reliable and safe operation of batteries. In the present paper, we investigate the observability and identifiability of cells in battery packs, realized in parallel and serial connections. The analysis is based on linear and nonlinear observability tests exploiting an equivalent circuit model. This leads to conclusive findings concerning the feasibility of estimating the states of single cells from lumped measurements. As shown for cells in parallel connection, one voltage and one current sensor are sufficient to determine state of charge and model parameters of the individual cells. The results are illustrated by simulations.