Research on a Novel Power Inductor-Based Bidirectional Lossless Equalization Circuit for Series-Connected  Battery Packs

Guo, Xiangwei; Kang, Longyun; Huang, Zhihui; Yao, Yuan; Yang, Huizhou

doi:10.3390/en8065555

Cited by 33 publications

(27 citation statements)

References 17 publications

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“…Therefore, to ensure the battery service life and the system performance during the charging and discharging periods, the energy equalization of battery strings is mandatory [9,12]. Many researchers have proposed various battery energy equalizers that each equalizer has distinctive advantages and suitable applications [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Multi‐Input and Multi‐Output Energy Equalization Circuit for the Li‐Ion Battery String Based on the Game Theory

et al. 2019

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Energy inconsistency among Li-ion battery cells widely exists in energy storage systems, which contributes to the continuous deterioration of the system durability and overall performance. Researchers have proposed various kinds of battery energy equalizers to reduce such inconsistency. Among them, the inductor equalizer is a predominant type in fast equalization applications. However, it requires relatively more complex control than other types of equalizers. In order to reduce the control complexity of inductor equalizers, a bidirectional multi-input and multi-output energy equalization circuit based on the game theory is proposed in the present work. The proposed equalizer has the modularized circuit topology and the mutually independent working principle. A static game model is developed and exploited for the mathematical description and control analysis of an energy equalization circuit comprised of these equalizers. The feasible control of each equalizer was obtained by solving a series of linear equations for the Nash Equilibrium of the model among the states of charge of the battery cells. The complexity of equations grows linearly with the cell number. The equivalent simulation model for the four-cell equalization is established in the PISM software, where the operational data and simulation results justify the static game model and verify the control validation, respectively. It is concluded that the proposed inductor equalizer is suitable for large-scale battery strings in energy storage systems, electrical vehicles, and new energy power generation applications.

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Section: Introductionmentioning

confidence: 99%

Bidirectional Multi‐Input and Multi‐Output Energy Equalization Circuit for the Li‐Ion Battery String Based on the Game Theory

et al. 2019

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“…However, the battery packs of EVs contain a number of battery cells connected in series, whose performances are often different [3][4][5]. If the differences among battery cells are ignored in battery pack control, then some issues might appear, such as overcharging or overdischarging, which can reduce the life cycle of the battery and sometimes even risk explosions [6].…”

Section: Introductionmentioning

confidence: 99%

Battery Equalization by Fly-Back Transformers with Inductance, Capacitance and Diode Absorbing Circuits

Liu

Sun

et al. 2017

Energies

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Battery equalization can increase batteries' life cycle, utilization, and reliability. Compared with battery equalization topologies based on resistance or energy storage components, the topologies based on transformers have the advantages of high balancing current and efficiency. However, the existence of switching losses will reduce the reliability and service life span of the equalization circuit. Aiming at resolving this problem, a new battery equalization topology by fly-back transformer with an absorbing circuit is proposed in this paper. Compared with other transformer-based topologies, it can decrease switching losses because the voltage/current spike is solved by the absorbing circuit which is composed of inductance, capacitance and diode (LCD), and it can also maintain a high balancing current of about 1.8 A and high efficiency of about 89%, while the balancing current and efficiency of other topologies were usually 1.725 A/1.5 A and 80%/80.4%. The working principle of the balancing topology and the process of soft switching are analyzed and calculated in the frequency domain. Due to the addition of the LCD absorbing circuit, soft switching can be realized to reduce the switching losses while the high equalization speed and efficiency are still maintained. The corresponding control strategy of the balancing topology is also proposed and the timely balancing is achieved. The theoretical analysis is verified by simulation and experimental results.

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“…As a result, various switch-mode converters are introduced and been reconfigured to be voltage equalizers for battery or EDLC strings [6,7]. A common characteristic of this type of voltage equalization system is that bulky magnetic components are used as the energy transfer device.…”

Section: Introductionmentioning

confidence: 99%

An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings

Cheng

2016

Energies

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Abstract:In this paper, a novel voltage equalizer is developed for series battery strings based on the two-phase switched capacitor technique. Different from the conventional voltage equalizers which are developed by switched-mode power converters, bulky magnetic components and complex monitoring and control system are avoided in the proposed system. Just a pair of complementary pulse signals with constant switching frequency and fixed duty ratio are required to control all of switches employed in the proposed voltage equalizer, and charge transfers from the higher voltage battery cells to lower voltage ones automatically. The circuit configuration and operation principle are provided in this paper. The model of the proposed voltage equalizer is also derived. Comparison with other works indicates that the proposed method is superior to the conventional switched-capacitor (SC) voltage equalizer for the high stack of series battery strings. Experimental results demonstrate that the proposed voltage equalization system is capable of excellent voltage balancing performance with a simple control method.

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Research on a Novel Power Inductor-Based Bidirectional Lossless Equalization Circuit for Series-Connected Battery Packs

Cited by 33 publications

References 17 publications

Bidirectional Multi‐Input and Multi‐Output Energy Equalization Circuit for the Li‐Ion Battery String Based on the Game Theory

Bidirectional Multi‐Input and Multi‐Output Energy Equalization Circuit for the Li‐Ion Battery String Based on the Game Theory

Battery Equalization by Fly-Back Transformers with Inductance, Capacitance and Diode Absorbing Circuits

An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings

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