A Novel Composite Equalizer Based on an Additional Cell for Series-Connected Lithium-Ion Cells

Lai, Xin; Jiang, Chun; Zheng, Yuejiu; Gao, Han; Huang, Peng; Zhou, Long

doi:10.3390/electronics7120366

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…The first one provides a review of the electrical circuit modeling of double layer capacitors for energy storage [48]. The reduction of battery cell inconsistency using a composite equalizer to improve overall system performance is addressed in [49]. Improvements of state-of-charge (SoC) estimation using optimization and proper filtering methods are introduced in [50].…”

Section: Emerging Power Electronic Technologies (Pulsed Power Energymentioning

confidence: 99%

Applications of Power Electronics

Blaabjerg

Dragičević

2019

Electronics

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Section: Emerging Power Electronic Technologies (Pulsed Power Energymentioning

confidence: 99%

Applications of Power Electronics

Blaabjerg

Dragičević

2019

Electronics

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“…7 However, due to the battery electrochemical principles, it usually requires hundreds of cells in series to meet the high voltage conditions. 8 The performance of cells in series is not simply proportionally enlarged by a single cell. Battery performance such as durability, safety, and energy density will decrease compared with the single cell.…”

Section: Introductionmentioning

confidence: 99%

A multi‐module equalization system for lithium‐ion battery packs

Pang

Zheng

et al. 2021

Intl J of Energy Research

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Battery inconsistency in electric vehicles is an important factor causing battery capacity degradation and safety problems. Therefore, battery equalization technology plays an important role in improving the performance and safety of battery packs. Among the existing equalization technologies, passive equalization is inefficient and active equalization is expensive and complex. Most of the active equalization algorithms only consider the balance of the cells within the battery module, but the balance between modules are not involved. However, battery packs for electric vehicles often consist of multiple modules, cooperative equalization between modules are essentially required to improve the balance efficiency. A novel cooperative equalization system for multi-modules in the battery pack is proposed in this paper. The system combines active and passive equalization, and also includes a fast discharge function for balancing modules by a power resistor. An equalization algorithm aiming at the optimal equalization time is studied. Finally, the equalization system is verified in simulation and experiment. The experimental results show that the proposed equalizer demonstrates good performance in different consistency cases using the proposed control strategy and optimization equalization algorithm.

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“…Cell equalization is an effective way of compensating for weak cells and providing safer pack solutions to extend battery run time and lifespan as well. In the last decade, considerable balancing architectures with various balancing strategies have been proposed in the literature [15][16][17][18][19][20][21] to solve the problem of cell imbalance. Based on the energy transfer manner, the equalizer is divided into passive and active types [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A Non-Dissipative Equalizer with Fast Energy Transfer Based on Adaptive Balancing Current Control

Wang

Liu

2020

Electronics

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In this study, an active inductive equalizer with fast energy transfer based on adaptive balancing current control is proposed to rapidly equilibrate lithium-ion battery packs. A multiphase structure of equalizer formed by many specific parallel converter legs (PCLs) with bidirectional energy conversion serves as the power transfer stage to make the charge shuttle back and forth between the cell and sub-pack or sub-pack and sub-pack more flexible and efficient. This article focuses on dealing with the problem of slow balancing rate, which inherently arises from the reduction of balancing current as the voltage difference between the cells or sub-packs decreases, especially in the later period of equalization. An adaptive varied-duty-cycle (AVDC) algorithm is put forward here to accelerate the balance process. The devised method has taken the battery nonlinear behavior and the nonideality of circuit component into consideration and can adaptively modulate the duty cycle with the change of voltage differences to maintain balancing current nearly constant in the whole equilibrating procedure. Test results derived from simulations and experiments are provided to demonstrate the validity and effectiveness of the equalizer prototype constructed. Comparing with the conventional fixed duty cycle (FDC) method, the improvements of 68.3% and 8.3% in terms of balance time and efficiency have been achieved.

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A Novel Composite Equalizer Based on an Additional Cell for Series-Connected Lithium-Ion Cells

Cited by 14 publications

References 34 publications

Applications of Power Electronics

Applications of Power Electronics

A multi‐module equalization system for lithium‐ion battery packs

A Non-Dissipative Equalizer with Fast Energy Transfer Based on Adaptive Balancing Current Control

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