Optimized structure for next-to-next balancing of series-connected lithium-ion cells

Phung, Thanh Hai; Crébier, Jean-Christophe; Chureau, Alexandre; Collet, Alexandre; Nguyen, Van Hoa

doi:10.1109/apec.2011.5744771

Cited by 66 publications

(26 citation statements)

References 9 publications

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“…The resulting effective single cell current is described by [18], [19] has N − 1 inductors to transfer energy between adjacent battery cells. For the first cell or the last cell in a battery module the mean currents are equal to (15) and (16) …”

Section: ) Multiple Transformersmentioning

confidence: 99%

Comparison of Active Battery Balancing Systems

Caspar

Eiler

Hohmann

2014

2014 IEEE Vehicle Power and Propulsion Conference (VPPC)

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A quantitative model-based comparison of 10 active balancing circuits is presented for equalizing imbalanced cell energies of lithium-ion batteries. A mean current model approach is introduced for active balancing to describe energy transfers between battery cells for long charge/discharge operation. A Thévenin model for 96 battery cells is used as a subsystem of a mid-size electric vehicle. In quasi-static simulations, FTP75 driving cycles are continuously repeated until the first cell is discharged from initial full charge. Simulation results are compared for cases of new and aged cells with different capacity distributions concerning equalization speeds and final differences of cell energy.

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Section: ) Multiple Transformersmentioning

confidence: 99%

Comparison of Active Battery Balancing Systems

Caspar

Eiler

Hohmann

2014

2014 IEEE Vehicle Power and Propulsion Conference (VPPC)

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“…The equalization circuits proposed by Lee [7], Yarlagadda [8], Phung [9], Lu [10], Chen [11], and Guo [12] belong to this type. Converter equalization circuits can realize bidirectional energy flow with higher balancing efficiency, but they often require a complex switch array and a precise control algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…Converter equalization circuits can realize bidirectional energy flow with higher balancing efficiency, but they often require a complex switch array and a precise control algorithm. Two of the most common inductor-based equalization circuits are the adjacent equalizer proposed in [9] and the single switched inductor equalizer proposed in [8]. As shown in figure 1(a), the inductor-based adjacent equalizer (IBAE) senses the voltage difference of the two neighboring cells, and transfers energy from the higher one to the lower one.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Application of a Novel Layered Bidirectional Equalizer for Series Connected Battery Strings

Wang¹,

Kang²,

Li³

et al. 2017

Preprint

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Abstract:To eliminate the influence of the inconsistency on the cycle life and the available capacity of the battery pack, and improve the balancing speed, a novel inductor-based layered bidirectional equalizer (IBLBE) is proposed. The equalizer is composed of the bottom balancing circuits and the upper balancing circuits, and the two layer circuits both consist of a plurality of balancing sub-circuits, which allow the dynamic adjustment of equalization path and equalization threshold. The battery string is modularized by layered balancing circuits to realize fast active equalization, especially for long battery strings. By controlling the bottom balancing circuits, the individual cells can be balanced in each module. At the same time, the equalization between battery modules can be realized by controlling the upper balancing circuits. Simulation and experimental results demonstrate that the proposed equalizer can achieve fast active equalization for a long battery string, and has the characteristics of multi balancing path, large balancing current and high accuracy. The advantages of the proposed equalizer are further verified by a comparison with existing active equalizer.

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“…In IBCs, two families of BCs are widely used [32]; Cuk converter-based BCs (CukBCs) [18][19][20][21][22][23] and buck-boost converter-based BCs (Buck-BoostBCs) [24][25][26][27][28]. Generally, there are more components in the CukBCs than the Buck-BoostBCs.…”

Section: Introductionmentioning

confidence: 99%

“…In active balancing systems, the balancing circuits (BCs) can be divided into three groups on the basis of the main component that transfers charge or energy among the cells in a pack; capacitor-based balancing circuits (CBCs) [4][5][6][7][8], transformer-based balancing circuits (TBCs) [9][10][11][12][13][14][15][16][17], and inductor-based balancing circuits (IBCs) [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. CBCs generally have low implementation costs, but their balancing speed is slow, especially when the voltage differences among the cells in the pack are low.…”

Section: Introductionmentioning

confidence: 99%

A Fast Multi-Switched Inductor Balancing System Based on a Fuzzy Logic Controller for Lithium-Ion Battery Packs in Electric Vehicles

et al. 2017

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Based on a low cost multi-switched inductor balancing circuit (MSIBC), a fuzzy logic (FL) controller is proposed to improve the balancing performances of lithium-ion battery packs instead of an existing proportional-integral (PI) controller. In the proposed FL controller, a cell's open circuit voltages (OCVs) and their differences in the pack are used as the inputs, and the output of the FL controller is the balancing current. The FL controller for the MSIBC has the advantage of maintaining high balancing currents over the existing PI controller in almost the entire balancing process for different lithium battery types. As a result, the proposed FL controller takes a much shorter time to achieve battery pack balancing, and thus more pack capacity can be recovered. This will help to improve the pack performance in electric vehicles and extend the serving time of the battery pack.

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Optimized structure for next-to-next balancing of series-connected lithium-ion cells

Cited by 66 publications

References 9 publications

Comparison of Active Battery Balancing Systems

Comparison of Active Battery Balancing Systems

Analysis and Application of a Novel Layered Bidirectional Equalizer for Series Connected Battery Strings

A Fast Multi-Switched Inductor Balancing System Based on a Fuzzy Logic Controller for Lithium-Ion Battery Packs in Electric Vehicles

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