State-of-Charge Balancing Control of a Battery Power Module for a Modularized Battery for Electric Vehicle

Choi, Seong-Chon; Jeon, Jin Yong; Yeo, Taejung; Kim, Young-Jae; Kim, Doyun; Won, Chung-Yuen

doi:10.5370/jeet.2016.11.3.629

Cited by 15 publications

(5 citation statements)

References 12 publications

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“…[132] In contrast, active equalization, also known as energy transfer equalization [133] employs energy storage components like capacitors and inductors to transfer electrical energy between batteries, [134] ensuring balanced control. There are various active equalization methods [135,136] that use inductors, capacitors, multi-tap transformers, or sophisticated bidirectional DC/DC converters as mediating elements. Among these, inductor-based strategies are notable for their straightforward switching logic, portability, compact size, cost-effectiveness, and simple control mechanisms compared to more complex systems.…”

Section: Battery Equalization Technologymentioning

confidence: 99%

Revolutionizing the Afterlife of EV Batteries: A Comprehensive Guide to Echelon Utilization Technologies

Wang,

Hu,

Wang

et al. 2023

ChemElectroChem

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In the burgeoning new energy automobile industry, repurposing retired power batteries stands out as a sustainable solution to environmental and energy challenges. This paper comprehensively examines crucial technologies involved in optimizing the reuse of batteries, spanning from disassembly techniques to safety management systems. The review assesses the viability of retired batteries, comparing their performance with that of new units, and evaluates scenarios for echelon utilization. Early safety warning systems based on temperature, voltage, and gas emissions are analyzed to enhance the understanding of safety management. In addition, the current state and enhancement opportunities for the second life of electric vehicle batteries are presented. The research highlights the integral role of retired power batteries in applications such as energy storage, communication bases, and streetlights. It is indicated that ensuring safety through robust early warning systems is of paramount importance. Ultimately, this paper envisions a sustainable future, driven by innovative strategies that facilitate the effective utilization of retired batteries in the new energy automobile industry.

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Section: Battery Equalization Technologymentioning

confidence: 99%

Revolutionizing the Afterlife of EV Batteries: A Comprehensive Guide to Echelon Utilization Technologies

Wang,

Hu,

Wang

et al. 2023

ChemElectroChem

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“…This approach performs better since SoC reflects more accurately the remaining energy in the cell. However, this method requires the estimation of the SoC of all cells since the SoC is not measured directly [22,23]. Some works [18,19,23] used a regression curve to estimate the SoCs of cells to reduce the computation burden.…”

Section: Converter Basedmentioning

confidence: 99%

“…However, this method requires the estimation of the SoC of all cells since the SoC is not measured directly [22,23]. Some works [18,19,23] used a regression curve to estimate the SoCs of cells to reduce the computation burden. A load current and SoC co-estimation approach was proposed to mitigate the need for installing a current sensor in [24].…”

Section: Converter Basedmentioning

confidence: 99%

Optimal SoC Balancing Control for Lithium-Ion Battery Cells Connected in Series

et al. 2021

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The optimal state of charge (SoC) balancing control for series-connected lithium-ion battery cells is presented in this paper. A modified SoC balancing circuit for two adjacent cells, based on the principle of a bidirectional Cuk converter, is proposed. The optimal SoC balancing problem is established to minimize the SoC differences of cells and the energy loss subject to constraints of the normal SoC operating range, the balancing current, and current of cells. This optimization problem is solved using the sequential quadratic programming algorithm to determine the optimal duties of PWM signals applied to the SoC balancing circuits. An algorithm for the selection of the initial points for the optimal problem-solving process is proposed. It is applied in cases where the cost function has no decreasing part. Experimental tests are conducted for seven series-connected Samsung cells. The optimal SoC balancing control and SoC estimation algorithms are coded in MATLAB and embedded in LabVIEW to control the SoC balancing in real time. The test results show that the differences between the SoCs of cells converges to the desired range using the proposed optimal SoC balancing control strategy.

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“…The method of using balancing circuits based on converters [21], [10], [12], [22], [23], [24] allows for controlling the balance currents between adjacent cells using more complex algorithms. These complex algorithms not only enable control of balance currents based on charge/discharge currents but also based on the health state of the cells, SoC limits, and preventing cells from overheating.…”

Section: Introductionmentioning

confidence: 99%

Optimal Active State-of-Charge Balancing with Temperature Control for Lithium-Ion Battery Cells Considering the Aging Effect

Van,

Quang

2024

Preprint

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This article presents an active State-of-Charge (SoC) balancing control method that considers the aging effect on the Lithium-Ion battery cells in a series connection implemented by a bidirectional CuK converter circuit. The purpose of balancing the SoC process for cells in the series ensures that, in all operating conditions, the current and temperature of the cells do not exceed the technical limits corresponding to the degree of aging of the cells. The nonlinear optimal control problem is established based on constraints on the balancing current, temperature, and the effect of cell aging in the dynamic model of the SoC balancing system. The sequential quadratic programming (SQP) method is used to solve the optimization problem at sampling time to determine the optimal duty cycle of the pulse width modulation (PWM) pulse to be applied to the balancing circuits. The SoC balancing results for cells are compared between the case where all cells in the series are new and the case where cells in the series have different levels of aging, showing differences in the control of balancing current and cell temperature in the SoC balancing process. The application of the optimal active SoC balancing method for cells in the series proposed in this article allows the cells in the series to operate safely, extend the life of the battery cells, reduce costs for energy storage applications aimed at popularizing the use of renewable energy sources and promoting the development of the electric vehicle industry, accelerating the implementation of global carbon reduction and environmental protection.

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State-of-Charge Balancing Control of a Battery Power Module for a Modularized Battery for Electric Vehicle

Cited by 15 publications

References 12 publications

Revolutionizing the Afterlife of EV Batteries: A Comprehensive Guide to Echelon Utilization Technologies

Revolutionizing the Afterlife of EV Batteries: A Comprehensive Guide to Echelon Utilization Technologies

Optimal SoC Balancing Control for Lithium-Ion Battery Cells Connected in Series

Optimal Active State-of-Charge Balancing with Temperature Control for Lithium-Ion Battery Cells Considering the Aging Effect

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