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Mechanisms for the evolution of cell-to-cell variations and their impacts on fast-charging performance within a lithium-ion battery pack

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Journal of Energy Chemistry 2024年第12期99卷 11-22页

作者： Yufang Lu Xiaoru Chen Xuebing Han Dongxu Guo Yu Wang Xuning Feng Minggao Ouyang State Key Laboratory of Intelligent Green Vehicle and Mobility School of Vehicle and MobilityTsinghua UniversityBejing 100084China Research Institute of Tsinghua University in Shenzhen Shenzhen 518057.GuangdongChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology.Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

Cell-to-cell variations(CtCV) compromise the electrochemical performance of battery packs, yet the evolutional mechanism and quantitative impacts of CtCV on the pack's fast-charging performance remain unexplored. This knowledge gap is vital for the proliferation of electric vehicles. This study underlies the relationship between CtCV and charging performance by assessing the pack's charge speed, final electric quantity, and temperature consistency. Cell variations and pack status are depicted using 2D parameter diagrams, and an m PnS configured pack model is built upon a decomposed electrode cell *** in three single electric parameters, i.e., capacity(Q), electric quantity(E), and internal resistance(R), and their dual interactions, i.e., E-Q and R-Q, are analyzed carefully. The results indicate that Q variations predominantly affect the final electric quantity of the pack, while R variations impact the charge speed most. With incremental variances in cell parameters, the pack's fast-charging capability first declines linearly and then deteriorates sharply as variations intensify. This research elucidates the correlations between pack charging capabilities and cell variations, providing essential insights for optimizing cell sorting and assembly, battery management design, and charging protocol development for battery packs.

关键词： Lithium-ion battery battery pack Cell-to-cell variation Fast charging Performance evaluation

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维普期刊数据库

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Anti-vibration Safety Performance Research of battery pack based on Finite Element Method in Electric Vehicle

Anti-vibration Safety Performance Research of Battery Pack b...

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第36届中国控制会议

作者： LI Gang FU Xingfeng YANG Yong South China University of Technology Guangzhou Automobile Group CO. LTD Automotive Engineering Institute

The battery pack anti-vibration safety was analysed by structural intensity Finite Element Analytical Method and the battery pack intensity,stiffness and anti-vibration FEA model were *** a guide of FEA calculation results,optimization design about battery pack inside and outside structure and welding method were *** battery pack intensity,stiffness and anti-vibration safety performance were improved *** test and simulation were proved that optimized battery pack should pass GB test and have excellent anti-vibration safety.

关键词： battery pack Anti-vibration performance Failure analysis

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battery package design optimization for small electric aircraft

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Chinese Journal of Aeronautics 2020年第11期33卷 2864-2876页

作者： Mingkai WANG Shuguang ZHANG Johannes DIEPOLDER Florian HOLZAPFEL Institute of Aircraft Airworthiness Engineering School of Transportation Science and EngineeringBeihang UniversityBeijing 100083China Institute of Flight System Dynamics Department of Mechanical EngineeringTechnical University of MunichGarching D-85748Germany

The increasing gross weight of electric Unmanned Aerial Vehicle(UAV) poses a challenge in practical applications. The range and endurance of the electric UAV are limited by the fixed mass of the battery package. In this work, a design optimization method for the battery package topology of small electric UAV is proposed to enhance the performance. To improve the accuracy of the method, the dynamic battery model and simplified electric component models are *** models are utilized by the trajectory optimization method, which takes the dynamic characteristic into consideration to calculate the aircraft performance. The direct optimal control method is used for solving the trajectory optimization problem, and this method is tested on a small blended-wing-body electric aircraft. The test result shows that the range and energy-consumption are mainly influenced by the parallel topology of the battery package, while the flight time in climb phase is more sensitive to the series topology. It is deduced that the range-and energy-optimal design points can be considered concurrently in design optimization. The work proves the feasibility of integrating the trajectory optimization and battery package design.

关键词： battery pack Design optimization Electric power system Trajectory optimization Unmanned Aerial Vehicle(UAV)

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维普期刊数据库

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Comparative study of the thermal insulation performance of steel and aluminum battery packs in high-and low-temperature environments

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Baosteel Technical Research 2022年第1期16卷 12-23页

作者： YANG Zhihui XU Dongkai XIAO Hua Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel) Shanghai201999China

As the only power source of pure electric vehicles,the performance of battery packs is easily affected by the temperature,and too high or too low temperature will make the performance of battery packs *** this study,the thermal analysis finite element modeling of a cast aluminum battery pack and steel battery pack of a pure electric vehicle is established to compare the thermal insulation performance of two kinds of battery packs under high-and low-temperature *** simulation results show that the thermal insulation performance of the two kinds of battery packs meets the design requirements under high-and low-temperature *** external environment of the cell and battery pack mainly transmits heat through heat *** at the problem that the uniform temperature performance of the steel battery pack is lower than that of the cast aluminum battery pack,several optimization solutions are put forward for the insulation design of the steel battery pack,and the optimal solution is obtained by comparing the simulation results.

关键词： battery pack thermal management insulation finite element analysis

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Cascaded Fractional Kalman Filtering for State and Current Estimation of Large-Scale Lithium-Ion battery packs

Cascaded Fractional Kalman Filtering for State and Current E...

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第30届中国控制与决策会议

作者： Martin Kupper Jochen Brenneisen Oliver Stark Stefan Krebs S?ren Hohmann Institute of Control Systems Karlsruhe Institute of Technology

In this paper, a cascaded fractional Kalman filter for state of charge and branch current estimation of largescale battery systems is proposed. As a centralized approach for the estimation of a large-scale system is costly in terms of effort and time, a partition into smaller and, therefore, simpler subsystems is applied. Since the overall system is divided into smaller units, a local computation is allowed and complexity reduced. In these distributed systems, usually,the subsystems communicate with each other to exchange relevant data. Using a model based on mesh currents, we receive a cascaded system structure which results in a hierarchical arrangement of all subsystems. This concludes in a one-directional information flow and, therefore, reduces the overall communication effort. Using this proposed approach,it is not only possible to estimate the states of each branch locally but also to calculate the branch currents when the total current is known. Finally, a practical test with real measurement data is presented.

关键词： State of Charge estimation Current estimation Kalman filter Cascaded systems Fractional order battery pack Large-scale Lithium-ion

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Research on Consistent Separation Method of Lithium Ion battery

Research on Consistent Separation Method of Lithium Ion Batt...

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2021中国汽车工程学会年会暨展览会

作者： Li Hongze Hong Hanchi Kong Qianxu Shi Xu Xiamen University of Technology

Lithium ion batteries are widely used in electric vehicles because of their high energy density,small self discharge,long storage time,long cycle life and no capacity memory *** batteries in electric vehicles are composed of single batteries in series and ***,due to certain differences in the performance of single batteries,the battery pack may have capacity failure and shortened service ***,it is of practical significance to quickly select the lithium-ion battery with the best performance for racing through a simple and reliable classification *** paper analyzes the reasons for the differentiation of lithium-ion batteries,and verifies through experiments that it is reasonable to use the internal resistance and capacity of batteries for preliminary sorting.

关键词： lithium ion battery separation method consistency battery pack single battery

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