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A Hybrid Method for Estimating the state of Health of Lithium-ion Batteries Based on Health Indicators during the Constant-Voltage Charging Stage 3

A Hybrid Method for Estimating the State of Health of Lithiu...

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3rd International Conference on Power Systems and Electrical technology, PSET 2024

作者： Li, Zhuohao Shi, Qionglin Xu, Maoshu Wang, Kangli Jiang, Kai Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350353204

The electrochemical energy storage technologies, with lithium-ion batteries at the forefront, have made significant contributions to alleviating the global energy crisis and environmental pollution. Assessing the state of health (SOH) of lithium-ion batteries is of paramount importance for their longterm safe and stable operation. Moreover, the constant voltage (CV) charging stage, known for its stability and significantly influences aging. Therefore, this paper proposes a hybrid health state estimation method based on health features extracted during the CV charging stage. Firstly, the CV stage of lithiumion batteries is analyzed, and five health indicators (HIs) are extracted. Pearson correlation analysis is then conducted to assess the interrelationships between the HIs and SOH. Subsequently, a PSO-SVR hybrid model is established to estimate the SOH, where Particle Swarm Optimization (PSO) is employed to tune the parameters of the Support Vector Regression (SVR) model. Finally, the accuracy of the method is validated using battery data from the Tongji University Clean Energy Vehicle engineering Center, resulting in an estimated root mean square error (RMSE) and mean absolute percentage error (MAPE) of less than 1.5%. © 2024 IEEE.

关键词： state of charge

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Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas

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Chinese Physics Letters 2024年第5期41卷 47-52页

作者：石鹏庄革程芝峰高丽周乙楠刘永罗景庭李景春 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Engineering and Applied Physics School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Nuclear and Radiation Safety Institute for Advanced Study in Nuclear Energy&SafetyCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 510640China

Quasi-coherent micro-instabilities is one of the key topics of magnetic confinement fusion. This work focuses on the quasi-coherent spectra of ion temperature gradient(ITG) and trapped-electron-mode instabilities using newly developed far-forward collective scattering measurements within ohmic plasmas in the J-TEXT *** ITG mode is characterized by frequencies ranging from 30 to 100 k Hz and wavenumbers(k_(θρs)) less than 0.3. Beyond a critical plasma density threshold, the ITG mode undergoes a bifurcation, which is marked by a reduction in frequency and an enhancement in amplitude. Concurrently, enhancements in ion energy loss and degradation in confinement are observed. This ground-breaking discovery represents the first instance of direct experimental evidence that establishes a clear link between ITG instability and ion thermal transport.

关键词： ITG mode collective

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Unraveling Electrochemical Stability and Reversible Redox of Y-Doped Li_(2)ZrCl_(6) Solid Electrolytes

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Energy Material Advances 2023年第1期4卷 120-129页

作者： Shuai Chen Chuang Yu Chaochao Wei Ziling Jiang Ziqi Zhang Linfeng Peng Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074P.R.China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074P.R.China

Lithium halide electrolytes show great potential in constructing high-energy-density solid-state batteries with high-voltage cathode materials due to their high electrochemical stability and wide voltage ***,the high cost and low conductivity of some compositions inhibit their ***,the effect of electronic additives in the cathode mixture on the stability and capacity is ***,the Y3+doping strategy is applied to enhance the conductivity of low-cost Li_(2)ZrCl_(6)*** tailoring the Y^(3+)dopant in the structure,the optimal Li_(2.5)Zr_(0.5)Y_(0.5)Cl_(6)with high conductivity up to 1.19×10^(−3) S cm^(−1) is ***_(2.5)Zr_(0.5)Y_(0.5)Cl_(6)@CNT/Li_(2.5)Zr_(0.5)Y_(0.5)Cl_(6)/Li_(5.5)PS_(4.5)Cl_(1.5)/In-Li solid-state batteries with different carbon nanotube(CNT)contents in the cathode are *** stability and electrochemical performances of the cathode mixture as a function of CNT content are *** cathode mixture containing 2%(wt.)CNT exhibits the highest stability and almost no discharge capacity,while the cathode mixture consisting of Li_(2.5)Zr_(0.5)Y_(0.5)Cl_(6)and 10%(wt.)CNT delivers a high initial discharge capacity of 199.0 mAh g^(−1)and reversible capacities in the following 100 *** characterizations are combined to unravel the working mechanism and confirm that the electrochemical reaction involves the 2-step reaction of Y^(3+)/Zr^(0),Zr^(4+)/Zr^(0),and Cl^(−)/Cl_(x)^(−)in the Li_(2.5)Zr_(0.5)Y_(0.5)Cl_(6)*** work provides insight into designing a lithium halide electrolyte-based cathode mixture with a high ionic/electronic conductive framework and good interfacial stability for solid-state batteries.

关键词： conductivity electrolyte stability

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Investigation of gyrotron-based collective Thomson scattering for fast ion diagnostics in a compact high-field tokamak

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Plasma Science and technology 2023年第6期25卷 14-22页

作者：徐登峰黄梅陈曦璇张峰夏冬辉王之江潘垣 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China

As a promising method for fast ion diagnostics,collective Thomson scattering(CTS)can measure the one-dimensional velocity distribution of fast ions with high spatial and temporal *** feasibility of diagnosing fast ions in a compact high-field tokamak by CTS was studied in this work,and the results showed that a wide range of probing frequencies could be applied.A high-frequency case and a low-frequency case were mainly considered for fast ion diagnostics in a compact high-field *** use of a high probing frequency could effectively avoid the refraction effect of the beams,while the application of a low probing frequency allows greater flexibility in the selection of scattering angle which may help to improve the spatial *** on typical plasma conditions(B_(0)=12.2 T,n_(e0)=4.3×10^(20)m^(-3),T_(e0)=22.2 keV,T_(i0)=19.8 keV)for a compact high-field tokamak,a220 GHz CTS diagnostic that utilizes a small scattering angle ofθ=30°and a 160 GHz CTS diagnostic that utilizes an orthogonal geometry were *** study showed that the high-frequency case could operate in a wider range of plasma conditions and provide more information on fast ions while the low-frequency case could achieve higher spatial resolution of the poloidal direction.

关键词： fast ion collective Thomson scattering gyrotron

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An Optimal Direct Torque Control Scheme for DC-biased Vernier Reluctance Machine Drives

An Optimal Direct Torque Control Scheme for DC-biased Vernie...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Li, Zimin Kong, Wubin Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350316445

An optimal direct torque control (OPT-DTC) scheme is proposed for DC-biased vernier reluctance machines (VRMs) to improve the steady and dynamic performance of drive system. Firstly, the nonlinear model of DC-biased VRM is proposed in synchronous rotating frame. Then, the optimal control theory is employed to the model by designing an optimal torque controller with the ability of regulating zero-sequence current. The feedforward control terms are designed to improve the dynamic response, and the feedback control terms are designed to improve the steady performance. An optimal load torque observer is designed for speed control. Finally, comparative experiments with conventional DTC schemes for DC-biased VRMs are carried out to verify the superior performance of the proposed method, including higher accuracy of torque and flux and faster dynamic response. © 2023 IEEE.

关键词： direct torque control Optimal control reluctance machines

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Anion-Regulated Weakly Solvating Electrolytes for High-Voltage Lithium Metal Batteries

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Energy & Environmental Materials 2023年第6期6卷 259-265页

作者： Zhipeng Jiang Jisheng Mo Chen Li Haiwen Li Qingan Zhang Ziqi Zeng Jia Xie Yongtao Li School of Materials Science and Engineering&Low-Carbon New Materials Research Center Anhui University of TechnologyMaanshan 243002China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education Anhui University of TechnologyMaanshan 243002China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hefei General Machinery Research Institute Hefei 230031China

Development of advanced high-voltage electrolytes is key to achieving high-energy-density lithium metal batteries(LMBs).Weakly solvating electrolytes(WSE)can produce unique anion-driven interphasial chemistry via altering the solvating power of the solvent,but it is difficult to dissolve the majority of Li salts and fail to cycle at a cut-off voltage above 4.5 ***,we present a new-type WSE that is regulated by the anion rather than the solvent,and the first realize stable cycling of dimethoxyethane(DME)at 4.6 V without the use of the“solvent-in-salt”*** relationships between the degree of dissociation of salts,the solvation structure of electrolytes,and the electrochemical performance of LMBs were systematically *** found that LiBF_(4),which has the lowest degree of dissociation,can construct an anion-rich inner solvation shell,resulting in anion-derived anode/cathode *** to such unusual solvation structure and interphasial chemistry,the Li-LiCoO_(2)full cell with LiBF_(4)-based WSE could deliver excellent rate performance(115 mAh g^(-1)at 10 C)and outstanding cycling stability even under practical conditions,including high loading(10.7 mg cm^(-2)),thin Li(50μm),and limited electrolyte(1.2μL mg^(-1)).

关键词： high-voltage LiCoO_(2) lithium metal batteries solvation structure weakly solvating electrolyte

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A Novel Control Strategy of Air-Core Pulsed Alternators for Driving electromagnetic Railgun 5th

A Novel Control Strategy of Air-Core Pulsed Alternators for ...

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5th International Conference on Energy Storage and Intelligent Vehicles, ICEIV 2022

作者： Wang, Jiasong Xie, Xianfei Yu, Kexun State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819910267

The pulse power system based on the air-core pulse alternator (ACPA) takes into account the high energy storage density and high power density, has the advantages of miniaturization, lightness and high repetitive output frequency, and is an important technical way of pulse power for electromagnetic railgun. It is necessary to make the speed of electromagnetic rail gun controllable and reduce the muzzle current in the process of actual combat, but the proposed working principle has not yet studied the speed control of rail gun and the strategy of reducing the muzzle current. In this paper, the two-phase discharge process of the ACPA is analyzed through the superconducting loop magnetic chain conservation and the characteristics of its commutation overlap process are analyzed. Then the feedback predictive control of rail gun speed based on pulse wave number control is derived on the basis of two-phase discharge, and the relationship between the initial excitation current of the discharge and the discharge speed of the rail gun is analyzed, and a possible continuous control of the speed of the rail gun based on the pulse power system of the ACPA is proposed. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Speed control

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Al-F co-doping towards enhanced electrolyte-electrodes interface properties for halide and sulfide solid electrolytes

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Chinese Chemical Letters 2025年第1期36卷 610-617页

作者： Han Yan Jingming Yao Zhangran Ye Qiaoquan Lin Ziqi Zhang Shulin Li Dawei Song Zhenyu Wang Chuang Yu Long Zhang College of Physics and Energy Fujian Normal UniversityFuzhou 350117China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Guilin Electrical Equipment Scientific Research Institute Co. Ltd.Guilin 541004China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China

All-solid-state Li batteries(ASSLBs)using solid electrolytes(SEs)have gained significant attention in recent years considering the safety issue and their high energy *** these advantages,the commercialization of ASSLBs still faces challenges regarding the electrolyte/electrodes interfaces and growth of Li *** doping is an effective and direct method to enhance the performance of ***,we report an Al-F co-doping strategy to improve the overall properties including ion conductivity,high voltage stability,and cathode and anode ***,the Al-F co-doping enables the formation of a thin Li-Al alloy layer and fluoride interphases,thereby constructing a relatively stable interface and promoting uniform Li *** similar merits of Al-F co-doping are also revealed in the Li-argyrodite *** assembled with these optimized electrolytes gain good electrochemical performance,demonstrating the universality of Al-F co-doping towards advanced SEs.

关键词： Solid electrolytes Li halides Li_(2)ZrCl_(6) Li argyrodites Fluorine doping

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Model Predictive Control Based Frequency Regulation for Power Systems Containing Massive Energy Storage Clusters 5th

Model Predictive Control Based Frequency Regulation for Powe...

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5th International Conference on Energy Storage and Intelligent Vehicles, ICEIV 2022

作者： Lin, Yujun Yang, Qiufan Zhou, Jianyu Chen, Xia Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819910267

A large number of small-capacity distributed energy storage (ES) systems have been introduced to take an important part in grid frequency regulation. However, the accompanying high-order optimization problem causes an inevitable issue for both centralized and distributed control methods. Accordingly, based on the reduced-order predictive model, a two-layer control strategy of frequency support for power systems is proposed in this paper, in which the frequency regulation and economic dispatch are combined. The lower layer is implemented in a distributed framework which only requires communication between adjacent ESs, and the upper layer only utilizes the reduced-order information sent from the lower layer which lessens the computation burdens. The effectiveness of the entire control method is validated under different scenarios by simulations. As indicated in the simulation results, the proposed method achieves almost the same control effect in ES clusters as that using centralized control with a shorter computing time. And the proposed method incorporates the widespread multiple small-capacity ESs effectively for power system frequency control. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Model predictive control

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Simplified Time-Domain Design Methodology for LLC Resonant Converter in EV Charging Station Application 3

Simplified Time-Domain Design Methodology for LLC Resonant C...

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3rd International Conference on Power Systems and Electrical technology, PSET 2024

作者： Yuan, Ye Xu, Lin Yao, Chuan Yuan, Jialing Wang, Xuehua Ruan, Xinbo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9798350353204

LLC resonant converter featuring excellent soft-switching characteristic has been widely used in electric vehicle (EV) charging stations and other applications requiring isolated voltage conversion. The Fundamental Harmonic Approximation (FHA) model has been widely used in the field of resonant converter due to its simple and intuitive characteristics. When the switching frequency deviates from the resonant frequency, the method no longer maintains high accuracy. In this paper, a more accurate parameter design method based on the simplified time-domain model is proposed, considering the load characteristic of the charging stations. Finally, the simulation model verifies that the simplified design method has higher accuracy in predicting voltage gain. Meanwhile, the resonant tank parameters designed based on this method make the converter more efficient in situations where voltage and frequency vary across a wide range. © 2024 IEEE.

关键词： Resonant converters

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