A Chain Structure of Switched Capacitor for Improved Cell Balancing Speed of Lithium-Ion Batteries

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

doi:10.1109/tie.2013.2288195

Cited by 300 publications

(171 citation statements)

References 22 publications

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“…In other words, the balance of the Cell 13 was slower than others, as shown in Figure 13a. Energy efficiency of the balancing circuit can be used Equation (20) [16] as follows:…”

Section: Resultsmentioning

confidence: 99%

“…A cell balancing circuit based on an SCC and operation modes of the circuit are shown in Figure 5 [8,15,16,21]. In order to simplify the analysis for circuit operation mode, it is assumed that the circuit has two cells and V Cell1 > V Cell2 .…”

Section: Cell Balancing Circuit Using Sccmentioning

confidence: 99%

“…Recently, the cell balancing methods have been introduced [10][11][12][13][14][15][16][17][18][19][20] and reviewed [7,8,[21][22][23], as represented in Figure 1. There are two main ways to equalize a battery cell, which are passive and active methods [8,22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Modular Cell Balancer Based on Multi-Winding Transformer and Switched-Capacitor Circuits for a Series-Connected Battery String in Electric Vehicles

Bui

Kim

et al. 2018

Applied Sciences

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Abstract:In this paper, a cell balancing topology for a series-connected Lithium-Ion battery string (SCBS) in electric vehicles is proposed and experimentally verified. In particular, this balancing topology based on the modular balancer consists of an intra-module balancer based on a multi-winding transformer circuit and an outer-module balancer based on a switched capacitor converter, both offering the potential advantages and over conventional balancing methods, including short equalization time, simple control scheme, elimination of voltage sensors. In addition, a number of cells in the SCBS can be easily extended in this circuit. Furthermore, a system structure and an operating principle of the proposed topology are analyzed and experimentally verified for three different cases. The voltages of all cells in the SCBS reached the balanced state regardless of the various arrangement of the initial voltage, where the energy efficiency of the circuit reached 83.31%. Our experimental realization of the proposed balancing topology shows that such a technique could be employed in electric vehicles.

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“…In other words, the balance of the Cell 13 was slower than others, as shown in Figure 13a. Energy efficiency of the balancing circuit can be used Equation (20) [16] as follows:…”

Section: Resultsmentioning

confidence: 99%

Section: Cell Balancing Circuit Using Sccmentioning

confidence: 99%

See 1 more Smart Citation

A Modular Cell Balancer Based on Multi-Winding Transformer and Switched-Capacitor Circuits for a Series-Connected Battery String in Electric Vehicles

Bui

Kim

et al. 2018

Applied Sciences

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“…To figure out this problem, many cell balancing methods [7,8] have been proposed so far. In general, these can be categorized into two representative methods, which are the passive and active balancing methods.…”

Section: Introductionmentioning

confidence: 99%

Optimal SOC Reference Based Active Cell Balancing on a Common Energy Bus of Battery

Bae

Park²,

Lee

2017

Journal of Electrical Engineering and Technology

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-This paper presents a study on the state-of-charge (SOC) reference based active cell balancing in real-time. The optimal references of SOC are determined by using the proposed active cell balancing system with the bidirectional DC/DC converters via the dual active bridge (DAB) type. Then, the energies between cells can be balanced by the power flow control of DAB based bidirectional DC/DC converters. That is, it provides the effective management of battery by transferring energy from the strong cell to the weak one until the cell voltages are equalized to the same level and therefore improving the additional charging capacity of battery. In particular, the cell aging of battery and power loss caused from energy transfer are considered. The performances of proposed active cell balancing system are evaluated by an electromagnetic transient program (EMTP) simulation. Then, the experimental prototype is implemented in hardware to verify the usefulness of proposed system.

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“…Variations also lead to an unbalanced state of charge (SoC) [5], and available pack capacity is limited by the SoC imbalance of cells. Early termination of charge/discharge cycles reduces the available pack capacity because of the strongest and weakest cells [6]. Therefore, monitoring cells in real time and maintaining cell SoCs are recommended to prolong the lifetime of batteries and retain the available pack capacity.…”

Section: Introductionmentioning

confidence: 99%

Development of an Optimized Algorithm for Bidirectional Equalization in Lithium-Ion Batteries

Sun¹,

Zhu²,

Lu³

et al. 2015

Journal of Power Electronics

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Many equalization circuits have been proposed to improve pack performance and reduce imbalance. Although bidirectional equalization topologies are promising in these methods, pre-equalization global equalization strategy is lacking. This study proposes a novel state-of-charge (SoC) equalization algorithm for bidirectional equalizer based on particle swarm optimization (PSO), which is employed to find optimal equalization time and steps. The working principle of bidirectional equalization topologies is analyzed, and the reason behind the application of SoC as a balancing criterion is explained. To verify the performance of the proposed algorithm, a pack with 12 LiFePO4 batteries is applied in the experiment. Results show that the maximum SoC gap is within 2% after equalization, and the available pack capacity is enhanced by 13.2%. Furthermore, a comparison between previously used methods and the proposed PSO equalization algorithm is presented. Experimental tests are performed, and results show that the proposed PSO equalization algorithm requires fewer steps and is superior to traditional methods in terms of equalization time, energy loss, and balancing performance.

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A Chain Structure of Switched Capacitor for Improved Cell Balancing Speed of Lithium-Ion Batteries

Cited by 300 publications

References 22 publications

A Modular Cell Balancer Based on Multi-Winding Transformer and Switched-Capacitor Circuits for a Series-Connected Battery String in Electric Vehicles

A Modular Cell Balancer Based on Multi-Winding Transformer and Switched-Capacitor Circuits for a Series-Connected Battery String in Electric Vehicles

Optimal SOC Reference Based Active Cell Balancing on a Common Energy Bus of Battery

Development of an Optimized Algorithm for Bidirectional Equalization in Lithium-Ion Batteries

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