Cell sorting for parallel lithium-ion battery systems: Evaluation based on an electric circuit model

An, Fuqiang; Huang, Jun; Wang, Chengyu; Li, Zhe; Zhang, Jianbo; Wang, Sean; Li, Ping

doi:10.1016/j.est.2016.04.007

Cited by 56 publications

(28 citation statements)

References 20 publications

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“…Based on these observations and our previous research conclusions, 3 we consider the self-discharge rate (k OCV ) of LICs, which can effectively combine the CtCVs of fresh and aged cells.…”

Section: Introductionmentioning

confidence: 89%

“…Normally, hundreds of lithium-ion cells (LICs) are connected in parallel and series in electric vehicles (EVs). Cell to cell variation (CtCV) is one of the most critical factors affecting the performance of the EVs, [1][2][3][4] including calendar life, power characteristics and safety issues. [5][6][7] In general, there are two approaches to improve the CtCVs.…”

Section: Introductionmentioning

confidence: 99%

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Self-discharge rates in cells have a critical effect on the cycle life of parallel lithium-ion batteries

Zhao

2018

RSC Adv.

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More than two parameters are adopted to sort the lithium ion cells (LICs) for better performance in the production process, such as capacity, open-circuit voltage (OCV), direct current resistance (DCR), et al.However, more sorting parameters make mass production more complex. In order to solve this conflict, we compare capacity, OCV, DCR, and self-discharge rate (k OCV ) in this paper, investigate their different effects on the cycle life of parallel LICs through analyzing the relationship between component cell variations and the durability of the parallel blocks. We find that the variations of the self-discharge rate in cells significantly affect the discharge capacity retention of the blocks: bigger variation in the cells results in a better cycle life of parallel LICs. Thus, it is prudent to perform cell sorting for the assembly of superior blocks based on the self-discharge rates of the cells. a NCA ¼ LiNi (1ÀxÀy) Co x Al y O 2 ; NCM ¼ LiNi (1ÀxÀy) Co x Mn y O 2 .

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“…Based on these observations and our previous research conclusions, 3 we consider the self-discharge rate (k OCV ) of LICs, which can effectively combine the CtCVs of fresh and aged cells.…”

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Self-discharge rates in cells have a critical effect on the cycle life of parallel lithium-ion batteries

Zhao

2018

RSC Adv.

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“…The components of internal resistance of MFCs have been the focus of the aforementioned studies in recent years [32][33][34][35]. Equivalent circuit modelling and its experimental validation via EIS is well known in the literature for energy storage devices such as Lithium ion batteries [36,37] and MFCs [38,39]. Thus in the present work, EIS of dual chambered MFCs ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Equivalent circuit modeling of microbial fuel cells using impedance spectroscopy

Sindhuja

Kumar

Sudha

et al. 2016

Journal of Energy Storage

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“…As a compromise between accuracy and feasibility, equivalent‐circuit models of battery packs have been investigated by many researchers. An et al . simulated the current of each cell in the parallel battery pack by using a simplified equivalent‐circuit model, in which the cell was simplified as a resistance in series with a voltage source.…”

Section: Introductionmentioning

confidence: 99%

“…As ac ompromise between accuracy and feasibility,e quivalent-circuit models of battery packs have been investigated by many researchers.A ne tal. [14] simulated the current of each cell in the parallel battery pack by using as implified equivalent-circuit model, in which the cell wass implified as a resistance in series with av oltage source.A ccording to their results,t his modelo nly has ah igher accuracy in cases of lower constant-current operation. Furthermore,acapacitor was incorporated into the equivalent-circuit model to describe the battery polarization effects.T he first-order RC (resistor-capacitor) equivalent-circuit modeli st he most commonc ircuit model for lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature Differences Among Cells on the Discharging Characteristics of Lithium‐Ion Battery Packs with Series/Parallel Configurations during Constant Power Discharge

Yang

Zhang

et al. 2018

Energy Tech

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This work aims to make a comparative analysis of the unbalanced discharging phenomenon for battery packs with series/parallel configurations due to the temperature differences among the cells. A theoretically‐based model is developed for the battery pack and constant power discharging processes are simulated by the model. At a constant temperature difference, lowering the operating temperature increases the divergence among the cell terminal voltages for the series pack and the cell discharging currents for the parallel pack. Increasing the temperature differences decreases the dischargeable energy of the series battery pack, whereas it has little effect on that of the parallel configuration. Given the same temperature difference, the cell energy differences within the parallel battery pack are 5–10 times higher than those within the series configuration, which shows that the temperature can be maintained much more uniformly for a parallel battery pack than for series configuration.

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Cell sorting for parallel lithium-ion battery systems: Evaluation based on an electric circuit model

Cited by 56 publications

References 20 publications

Self-discharge rates in cells have a critical effect on the cycle life of parallel lithium-ion batteries

Self-discharge rates in cells have a critical effect on the cycle life of parallel lithium-ion batteries

Equivalent circuit modeling of microbial fuel cells using impedance spectroscopy

Effects of Temperature Differences Among Cells on the Discharging Characteristics of Lithium‐Ion Battery Packs with Series/Parallel Configurations during Constant Power Discharge

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