Screening process-based modeling of the multi-cell battery string in series and parallel connections for high accuracy state-of-charge estimation

Kim, Jong-Hoon; Cho, B.H.

doi:10.1016/j.energy.2013.04.050

Cited by 103 publications

(37 citation statements)

References 43 publications

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“…A single cell model of the parallel unit will have one SOC, but the relationship of this SOC to the individual cell SOC is not well defined. A single model of parallel cells was developed by [3], but this assumed that the cells were identical which in reality may not be true because of ageing [4] and extrinsic factors such as temperature [5]. Cells may age at different rates specifically because of parallelization, due to the different current throughput and the resultant temperature gradients.…”

Section: Introductionmentioning

confidence: 99%

Current Variation in Parallelized Energy Storage Systems

Bruen

Marco

Gama

2014

2014 IEEE Vehicle Power and Propulsion Conference (VPPC)

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Abstract-an electric vehicle battery pack may employ cells connected electrically in parallel to meet energy and power requirements. For the battery management system, cells connected in parallel are often treated as a single larger component. However, research has identified that the state of charge and cell current may not be equal due to differences in capacity, impedance and cell temperature. In this paper, the authors develop a parallel cell model validated against experimental data. The model is used to evaluate cell energy variation and the impact this can have on the design of highly parallelized battery systems.

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Section: Introductionmentioning

confidence: 99%

Current Variation in Parallelized Energy Storage Systems

Bruen

Marco

Gama

2014

2014 IEEE Vehicle Power and Propulsion Conference (VPPC)

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“…On the other hand, the second realization is screening/filtering method, which is an indirect method [4,18,19]. A well designed screening process has been developed to select cells having similar capacity and internal resistance for packaging.…”

Section: Introductionmentioning

confidence: 99%

A novel dual-scale cell state-of-charge estimation approach for series-connected battery pack used in electric vehicles

Sun

Xiong

2015

Journal of Power Sources

190

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“…Therefore, it is necessary to establish a PCCP model to investigate PCCP management. Some researchers [15,31] proposed a parallel-connected cell pack model on the assumption that all the batteries are the same, which is obviously impractical. Currently, most PCCP models donot consider thermal influence, thus making most models imprecise.This study utilized the first-order RC equivalent model to build a model of eight parallel-connected cell packs.…”

Section: The Simulink Model For Parallel-cell Packmentioning

confidence: 99%

Energy Management of Parallel-Connected Cells in Electric Vehicles Based on Fuzzy Logic Control

et al. 2017

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Abstract:Inconsistencies that are associated with parallel-connected cells used in electric vehicles induce varied states of charge (SOCs) in each cell. Thus, loop current in the battery pack is inevitable, and this reduces overall capacity, energy utilization rate, and pack lifetime. However, no method is available to address loop current. To reduce loop current and the resulting battery inconsistency, a parallel-connected cell pack (PCCP) model that considers thermal effects is established, and a novel Simscape model that is based on PCCP is successfully constructed. Furthermore, the strategy of parallel-connected cell energy management (PCCEM) is proposed to utilize fuzzy logic control (FLC) strategy, which automatically adjusts the number of cells in a circuit in accordance with the load demand, and turns on the first N switches in the corresponding SOC order. The New European Driving Cycle (NEDC) driving cycle simulation shows that the PCCEM strategy considerably reduces loop current and improves the consistency of battery performance and the utilization rate of battery power.

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Screening process-based modeling of the multi-cell battery string in series and parallel connections for high accuracy state-of-charge estimation

Cited by 103 publications

References 43 publications

Current Variation in Parallelized Energy Storage Systems

Current Variation in Parallelized Energy Storage Systems

A novel dual-scale cell state-of-charge estimation approach for series-connected battery pack used in electric vehicles

Energy Management of Parallel-Connected Cells in Electric Vehicles Based on Fuzzy Logic Control

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