Active vehicle battery balancing scheme in the condition of constant-voltage/current charging and discharging

Zheng, Xinxin; Liu, Xintian; He, Ye; Zeng, Guojian

doi:10.1109/tvt.2016.2609920

Cited by 36 publications

(22 citation statements)

References 34 publications

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“…According to Kirchhoff's voltage law, we can list frequency domain equations as in (14). From Equation (14), we can get the current expression as Equation (15):…”

Section: Operation Of Energy Transfermentioning

confidence: 99%

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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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“…According to Kirchhoff's voltage law, we can list frequency domain equations as in (14). From Equation (14), we can get the current expression as Equation (15):…”

Section: Operation Of Energy Transfermentioning

confidence: 99%

“…Both inverters were demonstrated to exhibit a doubling of voltage gain, with one of them also shown to produce a better output waveform quality. In [14], energy storage inductors were applied in a balancing circuit and their number was less than that of the switches. The topology was simple and easy to control.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Sun

et al. 2017

Energies

Self Cite

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“…This approach has significant advantages in energy consumption and application prospects. Therefore, the active cell balancing has received considerable attention and is also a method that is currently studied …”

Section: Introductionmentioning

confidence: 99%

“…In addition, although the capacitor‐based balancing circuit is simple, the control strategy is complicated. Second, the inductor‐based balancing circuit uses the inductor to store electrical energy to perform energy balancing . The traditional inductor‐based balancing circuit only enables energy to be transferred between adjacent battery cells, and the energy of each cell in the entire battery pack tends to be uniform after multiple cycles.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the active cell balancing has received considerable attention and is also a method that is currently studied. [11][12][13][14][15][16][17][18][19][20][21] According to different energy transfer components and the balancing strategy, the active cell balancing circuit can be divided into three types. First, the capacitor-based balancing circuit achieves equalization by charging and discharging the capacitor that refers to the voltage difference between the battery cells.…”

Section: Introductionmentioning

confidence: 99%

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Active cell balancing of lithium‐ion battery pack based on average state of charge

Zhang

et al. 2020

Int J Energy Res

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Summary Differences in the environment and parameters of lithium‐ion battery (LiB) cells may lead the residual capacity between the battery cells to be inconsistent, and the battery cells may be damaged due to overcharging or overdischarging. In this study, an active balancing method for charging and discharging of LiB pack based on average state of charge (SOC) is proposed. Two different active balancing strategies are developed according to the different charging and discharging states of LiB pack. When the LiB pack is charging, charging balance strategy is performed, wherein the battery cells whose SOC is higher than the average SOC of the LiB pack are balanced to increase the charging capacity of the entire LiB pack. When the LiB pack is discharging or static standing, discharging balance strategy is performed, wherein the batter cells whose SOC is lower than the average SOC of the LiB pack are balanced to increase the discharging capacity of the entire LiB pack. The experimental results show that the proposed active balancing method can reduce the inconsistency of residual energy between the battery cells and improve the charging and discharging capacity of the LiB pack.

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Joint optimization of efficiency and volume for an inductor‐based battery balancing circuit

Jiang,

Ye,

Zhao

et al. 2024

Circuit Theory & Apps

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SummaryIn recent years, with the increase in the number of electric vehicles, the number of retired power batteries, which predominantly include lithium‐ion batteries, has surged. Recycling these retired power batteries can reduce environmental pollution and resource waste. However, the voltage of a single lithium‐ion battery is low, and multiple single batteries need to be connected in series to satisfy application requirements. This use of multiple batteries results in inconsistencies in battery cell parameters. As the number of series connections increases, this inconsistency problem becomes more prominent, and it can even decrease the system's capable number of charge and discharge cycles. Due to the wide voltage performances of lithium‐ion batteries, inductive balancing circuits are more suitable for balancing a series of lithium‐ion battery cells. This paper considers a single inductor balancing circuit and proposes a joint optimization of efficiency and volume. By flexibly allocating the weight coefficients of efficiency and volume, the algorithm can optimize the overall efficiency and volume of the hardware circuit according to different circuit design requirements. Finally, the effectiveness of the proposed joint optimization method is verified by building a laboratory prototype.

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Active vehicle battery balancing scheme in the condition of constant-voltage/current charging and discharging

Cited by 36 publications

References 34 publications

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

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

Active cell balancing of lithium‐ion battery pack based on average state of charge

Joint optimization of efficiency and volume for an inductor‐based battery balancing circuit

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