Center-Cell Concentration Structure of a Cell-to-Cell Balancing Circuit With a Reduced Number of Switches

Kim, Moon-Young; Kim, Junho; Moon, Gun-Woo

doi:10.1109/tpel.2013.2292078

Cited by 151 publications

(60 citation statements)

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“…Based on the main balancing components, active balancing circuits can be divided into three groups: capacitor based balancing circuits [11,[29][30][31][32][33][34][35][36], inductor based balancing circuits [5,8,27,[37][38][39][40][41][42][43][44][45] and transformer based balancing circuits [6,7,25,26,[46][47][48][49][50][51]. Not every active balancing circuit can use SOC as the balancing criterion due to the nature of the balancing components and the topology of the balancing circuits.…”

Section: Current Calculation Of Each Cell For Soc Estimation With Flymentioning

confidence: 99%

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A Novel Active Online State of Charge Based Balancing Approach for Lithium-Ion Battery Packs during Fast Charging Process in Electric Vehicles

et al. 2017

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Non-uniformity of Lithium-ion cells in a battery pack is inevitable and has become the bottleneck to the pack capacity, especially in the fast charging process. Therefore, a balancing approach is essentially required. This paper proposes an active online cell balancing approach in a tfast charging process using the state of charge (SOC) as balancing criterion. The goal of this approach is to complete pack balancing within the limited charging time. An adaptive extended Kalman filter (AEKF) is applied to estimate the pack cell SOC during the charging process to obtain accurate results under modeling errors and measurement noises. To implement the proposed AEKF, only one additional current sensor is required to obtain the current of each cell required for the SOC estimation. An experimental platform is established to verify the effectiveness of the proposed approach. The results show that the proposed balancing approach with the SOC as a balancing criterion can overcome the challenges of non-uniformity and flat voltage plateau and charge more capacity into a LiFePO 4 battery pack than those with the terminal voltage as a balancing criterion in the fast charging process.Keywords: lithium-ion battery pack; the active cell balancing for battery packs; fast charging with balancing; electric vehicles; adaptive extended Kalman filter; pack SOC estimation Highlights:• Adaptive extended Kalman filter (AEKF) is employed to estimate the pack cell state of charge (SOC) in real time, which is used as a balancing criterion to equalize cells in a LiFePO 4 battery pack in the fast charging process.• Only one additional current sensor in the chosen balancing circuit is required to accurately estimate pack cell SOC, leading to low cost implementation.• Balancing in the fast charging process based on online estimated SOC overcomes non-uniformity and allows more pack capacity to be charged. •Experimental platform is established to demonstrate that the performances based on the SOC criterion is better than those based on the terminal voltage criterion in terms of extra charged capacity of 2.07 Ah, equivalent to 13% of the nominal capacity of the chosen battery pack.

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Section: Current Calculation Of Each Cell For Soc Estimation With Flymentioning

confidence: 99%

“…Recently, active cell balancing is widely used in maintenance conditions in which the charging or discharging stops when the balancing operates [5][6][7][8]. In maintenance conditions, there is no strict restriction of balancing time and balancing speed is not critical.…”

Section: Introductionmentioning

confidence: 99%

A Novel Active Online State of Charge Based Balancing Approach for Lithium-Ion Battery Packs during Fast Charging Process in Electric Vehicles

et al. 2017

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“…Nowadays, a lot of equalization structures and balancing strategies have been proposed [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], and summarized in [2,15]. In considerations of energy consumption and transformation, they can be divided into dissipative balancing circuits [4] or non-dissipative balancing circuits [5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…In considerations of energy consumption and transformation, they can be divided into dissipative balancing circuits [4] or non-dissipative balancing circuits [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Dissipative balancing circuits violate the future trend of energy-saving, although it is practical with simple topologic and convenient control strategy.…”

Section: Introductionmentioning

confidence: 99%

“…Dissipative balancing circuits violate the future trend of energy-saving, although it is practical with simple topologic and convenient control strategy. According to the charge transfer structure, non-dissipative balancing circuits can be classified into three methods: pack-to-cell balancing methods [6][7][8][9][10][11], a direct cell-to-cell method [12][13][14] and an adjacent cell-to-cell method [15][16][17]. The pack-to-cell balancing methods and direct cell-to-cell generally show outstanding balancing performance and speed due to direct charge transfer.…”

Section: Introductionmentioning

confidence: 99%

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Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Zhang

Zhu

et al. 2015

Energies

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Abstract:The Li-ion battery is becoming the optimal choice for the Electric Vehicle's (EV) power supply. In order to protect the Li-ion battery from charging damage and to prolong the battery's life, a special control strategy based on the dynamic balanced point along with a non-dissipative equalizer is presented. The main focus of the proposed control strategy is to insure that the individual cell of a battery pack will be rapidly, efficiently and simultaneously balanced, by adjusting equalizing current of each cell dynamically. In this paper, a model of a four series connected Li-ion batteries pack has been established to evaluate the proposed control strategy. Superior performance is demonstrated by the simulation and experiment.

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Balancing/Balancing Control

2022

Battery Management System and Its Applications

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Center-Cell Concentration Structure of a Cell-to-Cell Balancing Circuit With a Reduced Number of Switches

Cited by 151 publications

References 50 publications

A Novel Active Online State of Charge Based Balancing Approach for Lithium-Ion Battery Packs during Fast Charging Process in Electric Vehicles

A Novel Active Online State of Charge Based Balancing Approach for Lithium-Ion Battery Packs during Fast Charging Process in Electric Vehicles

Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Balancing/Balancing Control

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