Conventional passive ECs employ shunting resistors to bypass current because they dissipate the extra energy of battery cells with high voltage or SOC to achieve cell consistency. ... Passive ECs are suitable for on-line battery pack equalization in EVs. ... On-line equalization for lithium-ion battery packs based on charging cell voltages ...
Conventional passive ECs employ shunting resistors to bypass current because they dissipate the extra energy of battery cells with high voltage or SOC to achieve cell consistency. ... Passive ECs are suitable for on-line battery pack equalization in EVs. ... On-line equalization for lithium-ion battery packs based on charging cell voltages ...
A nondissipative equalization scheme based on fuzzy logic control (FLC) is presented to improve the inconsistency of series-connected Lithium-ion batteries and the energy efficiency improves and equalization time decreases under new European driving cycle working conditions. A nondissipative equalization scheme based on fuzzy logic control (FLC) is …
With the state of charge (SOC) of the battery as the equalization variable, and the equalization control strategy is designed based on the consistency controller and PI …
On-line equalization for lithium-ion battery packs based on charging cell voltages: Part 1. ... We investigate cell equalization currents in Sim6 for Pack C. Cell equalization currents of the first 100 standard cycles are plotted in Fig. 10 ... Nevertheless as there is a small pack capacity difference from the DCE theoretical pack capacity ...
Chen Y, Liu X, Fathy HK, Zou J, Yang S. A graph-theoretic framework for analyzing the speeds and efficiencies of battery pack equalization circuits. Int J Electr Power Energy Syst 2018;98:85–99. [25] Zheng Y, Ouyang M, Lu L, Li J, Han X, Xu L. On-line equalization for lithium-ion battery packs based on charging cell voltages: Part 1.
The equalization technique is a key technique in the secondary utilization of retired batteries. In this paper, a double-layer equalization method is proposed, which combines the reconfigurable topology with the converter active equalization method. The inner layer uses the reconfigurable topology to have a balanced set of battery cells. Thanks to isolating the …
The equalization technique is a key technique in the secondary utilization of retired batteries. In this paper, a double-layer equalization method is proposed, which combines the reconfigurable topology with the converter …
In order to improve the working efficiency of the power battery pack and prolong the service life, there is a problem of inconsistency Packs the indi- among ... Equalization Strategy for Lithium Battery . Open Journal of Applied Sciences, 9 ... be equalized. In the active equalization structure part, two adjacent battery cells share one current ...
Semantic Scholar extracted view of "On-line equalization for lithium-ion battery packs based on charging cell voltages: Part 2. ... Lithium-ion battery pack equalization based on charging voltage curves ... dc converter with energy transferring capacitor that can be designed as a ripple-free converter for improving the input current distortion ...
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.
Battery equalization is a crucial technology for lithium-ion batteries, and a simple and reliable voltage-equalization control strategy is widely used because the battery terminal voltage is very ...
It is verified by simulation that the proposed fuzzy control strategy can limit the operating current of the lithium battery within the range of [-3A-3A], and the maximum operating current of the ...
In this series of two papers, we discover that DCE is a feasible and appropriate on-line equalization topology for battery packs in EVs. We therefore propose two effective on …
Abstract. With the rapid development of new energy vehicles, a large number of lithium batteries have been produced, used, and then retired. The full utilization and safe use of the whole life cycle of the batteries have become a hot topic in the research field. Compared to brand-new batteries, retired power batteries exhibit significant inconsistency and safety risks, …
Semantic Scholar extracted view of "On-line equalization for lithium-ion battery packs based on charging cell voltages: Part 1. ... dc converter with energy transferring capacitor that can be designed as a ripple-free converter for improving the input current distortion of the battery charge supply power system. ... Slight differences between ...
The average hybrid equalization current was 0.073 A larger than the average active equalization current. However, the capacity of the battery pack with hybrid equalization was 0.369 Ah higher than that with active equalization. Hybrid equalization was more conducive to the regular maintenance of the battery pack.
Even with the same voltage level, different types of battery packs have different requirements for the volume of the battery equalization circuit. However, most equalization circuits have the same problem: the volume of the equalization circuit is fixed once the voltage level of the battery pack is determined. In order to solve this problem, this paper proposes a …
In addition, as the maximum equalization current is established at 2 A, it keeps the overall efficiency high, taking into account the high values that the battery current reaches. 3.2. On-line deteriorated cell detection and change decision simulation results. In this case, three cells with different series resistance are utilized.
A bidirectional active equalization control strategy is proposed for the energy storage lithium battery pack and the fuzzy PI controller is designed to optimize the equalization current, thus improving theequalization speed and efficiency. Lithium battery pack is the smallest unit of energy storage system. Due to differences in manufacturing processes and …
Currently, the active equalization topology based on high frequency switching technology transfers the power from the cell with high energy to the cell with low energy by …
This paper presents a cell optimal equalizing control method for Lithium-Ion battery pack formed by many cells connected in series in order to extract the maximum …
As shown in Figure 3, Q1 and Q2 are closed, whereas all other MOSFETs are disconnected. The DC-DC converter charges the energy from the battery pack to B1, and the SOC of B1 is gradually rising at this time. If B1 has the lowest SOC, then after DC-DC charging, its SOC will component rise, that is, it will achieve the goal of battery equalization.
In order to address the energy imbalance issue of a series-connected lithium-iron battery pack, this paper proposes an active equalization method based on a reduced-order solving strategy for the Hanoi Tower problem. The proposed scheme utilizes a combined structure of a switching-network circuit and a bidirectional Cuk converter and leverages an ultracapacitor …
Background: How to solve the inconsistency of battery pack is a key point to ensure reliable operation of electric vehicles. Battery equalization is an effective measure to address the inconsistency. Passive equalization method has poor efficiency and thermal management problems. Average voltage equalization method is only suitable for situations …
Model neural networks (NNs) can achieve nonlinear mapping with arbitrary accuracy. However, the NN requires a large amount of data to train. In this paper, an adaptive …
equalization technology makes the energy in the battery pack flow between single batteries by building an equalization circuit, which provides a strong guarantee for the efficient output and stable operation of lithium-ion batteries. This paper summarizes the current equilibrium topology of lithium-ion battery pack by
The difference of each adjacent battery pack in the series lithium batteries and the difference of each adjacent battery pack in each monomer lithium battery are used as the equalization criteria ...
Lithium-ion battery pack capacity directly determines the driving range and dynamic ability of electric vehicles (EVs). However, inconsistency issues occur and decrease the pack capacity due to internal and external reasons. In this paper, an equalization strategy is proposed to solve the inconsistency issues. The difference of inconsistency for lithium-ion battery pack …
In [], a hard constraint of the terminal state vector (x(N)=x_s(N)) is used to make the cells'' SOCs at the end of the charging process equal to their target value.However, the user settings may not be accomplished in practice; for example, even if we persistently charge the battery with the maximum allowed charging current, the battery pack cannot be fully charged …
In this paper, the battery pack means the whole battery system, a battery group is a group of n b attery cells, and the working part of a battery group consists n or n − 1 battery cells ...
At present, the main application of battery equalization technology to solve the energy inconsistency problem that occurs during the operation of lithium batteries [9]. The main part of the equalization technology is the equalization topology and equalization control strategy, lithium battery equalization topology circuit structure is the ...
Battery equalization plays a critical role in guaranteeing battery pack to operate safely and steadily. In this paper, the research progress of balancing topology for series-connected lithium-ion ...