Overview of Cell Equalization Systems

Chen, Jian; Ouyang, Quan; Wang, Zhisheng

doi:10.1007/978-981-99-0220-0_2

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2024

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Cited by 2 publications

References 63 publications

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State Estimation and Cell Balancing for Lithium‐Ion Batteries Powering Electrical Vehicles

Sharma,

Letha,

Syal

et al. 2024

Smart Electric and Hybrid Vehicles

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State Estimation and Cell Balancing for Lithium‐Ion Batteries Powering Electrical Vehicles

Sharma,

Letha,

Syal

et al. 2024

Smart Electric and Hybrid Vehicles

View full text Add to dashboard Cite

Current Imbalance in Dissimilar Parallel-Connected Batteries and the Fate of Degradation Convergence

Weng,

Movahedi,

Wong

et al. 2024

Journal of Dynamic Systems, Measurement, and Control

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This paper proposes an analytical framework describing how initial capacity and resistance variability in parallel-connected battery cells may inflict additional variability or reduce variability while the cells age. We derive closed-form equations for current and SOC imbalance dynamics within any given charge or discharge cycle. These dynamics are represented by a first-order equivalent circuit model with a linear open circuit voltage behavior and validated against experimental data. To demonstrate how current and SOC imbalance leads to cell degradation, we developed a simplified, incremental degradation update scheme based on the solid electrolyte interphase growth mechanism. We propose a scheme in which the inter-cycle imbalance dynamics update the intra-cycle degradation dynamics, and vice versa. Using this framework, we demonstrate that current imbalance can cause convergent degradation trajectories, consistent with previous reports. However, we also demonstrate that different degradation assumptions, such as those associated with SOC imbalance, may cause divergent degradation in some cases. We finally highlight the role of different cell chemistries, including different OCV function nonlinearities, on system behavior, and derive analytical bounds on the SOC imbalance using Lyapunov analysis.

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Overview of Cell Equalization Systems

Cited by 2 publications

References 63 publications

State Estimation and Cell Balancing for Lithium‐Ion Batteries Powering Electrical Vehicles

State Estimation and Cell Balancing for Lithium‐Ion Batteries Powering Electrical Vehicles

Current Imbalance in Dissimilar Parallel-Connected Batteries and the Fate of Degradation Convergence

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