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An ultra-fast charging strategy for lithium-ion battery at low temperature without lithium plating

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Journal of Energy Chemistry 2022年第9期31卷 442-452,I0013页

作者： Yudi Qin Pengyu Zuo Xiaoru chen Wenjing Yuan Rong Huang Xiaokan Yang Jiuyu Du languang Lu Xuebing Han Minggao Ouyang State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084China Beijing LianYu Technology Co. Ltd.Beijing 100084China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Beijing Electric Vehicle Co. Ltd.Beijing 100176China

Conventional charging methods for lithium-ion battery(LIB)are challenged with vital problems at low temperatures:risk of lithium(Li)plating and low charging *** study proposes a fast-charging strategy without Li plating to achieve high-rate charging at low temperatures with bidirectional *** strategy combines the pulsed-heating method and the optimal charging method via precise control of the battery states.A thermo-electric coupled model is developed based on the pseudo-twodimensional(P2D)electrochemical model to derive charging *** current maps of pulsed heating and charging are generated to realize real-time ***,our proposed strategy achieves a 3 C equivalent rate at 0℃ and 1.5 C at-10℃ without Li plating,which is 10–30 times faster than the traditional *** entropy method is employed to balance the charging speed and the energy efficiency,and the charging performance is further *** practical application,the power limitation of the charger is considered,and a 2.4 C equivalent rate is achieved at 0℃ with a 250 kW maximum power *** novel strategy significantly expands LIB usage boundary,and increases charging speed and battery safety.

关键词： Lithium-ion battery Pulsed heating Fast charging Low temperature Lithium deposition

In-depth investigation of the exothermic reactions between lithiated graphite and electrolyte in lithium-ion battery

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Journal of Energy Chemistry 2022年第6期31卷 593-600,I0017页

作者： Yuejiu Zheng Zhihe Shi Dongsheng Ren Jie chen Xiang Liu Xuning Feng Li Wang Xuebing Han languang Lu Xiangming He Minggao Ouyang College of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China College of Electrical Engineering University of Beijing JiaotongBeijing 100044China

Thermal runaway is a critical issue for the large application of lithium-ion *** reactions between lithiated graphite and electrolyte play a crucial role in the thermal runaway of lithium-ion ***,the role of each component in the electrolyte during the exothermic reactions with lithiated graphite has not been fully *** this paper,the exothermic reactions between lithiated graphite and electrolyte of lithium-ion battery are investigated through differential scanning calorimetry(DSC) and evolved gas *** lithiated graphite in the presence of electrolyte exhibit three exothermic peaks during DSC *** reactions between lithiated graphite and LiPF_(6) and ethylene carbonate are found to be responsible for the first two exothermic peaks,while the third exothermic peak is attributed to the reaction between lithiated graphite and *** contrast,diethylene carbonate and ethyl methyl carbonate contribute little to the total heat generation of graphite-electrolyte *** reaction mechanism between lithiated graphite and electrolyte,including the major reaction equations and gas products,are ***,DSC tests on samples with various amounts of electrolyte are performed to clarify the quantitative relationship between lithiated graphite and electrolyte during the exothermic reactions.2.5 mg of lithiated graphite (Li_(0.8627)C_(6)) can fully react with around 7.2 mg electrolyte,releasing a heat generation of 2491 J g^(-1).The results presented in this study can provide useful guidance for the safety improvement of lithium-ion batteries.

关键词： Lithium-ion battery Battery safety Thermal runaway Exothermic reaction Li-intercalated graphite Electrolyte

Thermal Runaway of Lithium-Ion Batteries Employing Flame-Retardant Fluorinated Electrolytes

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Energy & Environmental Materials 2023年第1期6卷 333-339页

作者： Junxian Hou Li Wang Xuning Feng Junpei Terada languang Lu Shigeaki Yamazaki Anyu Su Yoshiko Kuwajima Yongjiang chen Tomoya Hidaka Xiangming He Hewu Wang Minggao Ouyang State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Daikin Industries Ltd.1-1Nishi-HitotsuyaSettsu Osaka 566-8585Japan Sichuan New Energy Vehicle Innovation Center Yibin 644002China

Fluorinated electrolytes possess good antioxidant capacity that provides high compatibility to high-voltage cathode and flame retardance;thus,they are considered as a promising solution for advanced lithium-ion batteries carrying both high-energy density and high ***,the fluorinated electrolytes are widely used to form stable electrolyte interphase,due to their chemical reactivity with lithiated graphite or ***,the influence of this reactivity on the thermal safety of batteries is seldom ***,we demonstrate that the flame-retardant fluorinated electrolytes help to reduce the flammability,while the lithium-ion batteries with flame-retardant fluorinated electrolytes still undergo thermal runaway and disclose their different thermal runaway pathway from that of battery with conventional *** reduction in fluorinated components(e.g.,LiPF 6 and fluoroethylene carbonate(FEC))by fully lithiated graphite accounts for a significant heat release during battery thermal *** 13%of total heat is sufficient to trigger the chain reactions during battery thermal *** study deepens the understanding of the thermal runaway mechanism of lithium-ion batteries employing flame-retardant fluorinated electrolytes,providing guidance on the concept of electrolyte design for safer lithium-ion batteries.

关键词： battery safety flame retardance fluorinated electrolytes lithium-ion battery thermal runaway

Thermal Runaway Characteristics and Modeling of LiFePO4 Power Battery for Electric Vehicles

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Automotive Innovation 2023年第3期6卷 414-424页

作者： Tao Sun Luyan Wang Dongsheng Ren Zhihe Shi Jie chen Yuejiu Zheng Xuning Feng Xuebing Han languang Lu Li Wang Xiangming He Minggao Ouyang School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China

LiFePO_(4)(LFP)lithium-ion batteries have gained widespread use in electric vehicles due to their safety and longevity,but thermal runaway(TR)incidents still have been *** paper explores the TR characteristics and modeling of LFP batteries at different states of charge(SOC).Adiabatic tests reveal that TR severity increases with SOC,and five stages are identified based on battery temperature *** kinetics parameters of exothermic reactions in each TR stage are extracted,and TR models for LFP batteries are *** models accurately simulate TR behaviors at different SOCs,and the simulated TR characteristic temperatures also agree well with the experimental results,with errors of TR characteristic temperatures less than 3%.The prediction errors of TR characteristic temperatures under oven test conditions are also less than 1%.The results provide a comprehensive understanding of TR in LFP batteries,which is useful for battery safety design and optimization.

关键词： Lithium-ion battery Safety Thermal runaway Thermal runaway model State of charge

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基于模型的动力电池系统多尺度热安全设计

中国机械工程 2018年第15期29卷 1840-1846,1874页

作者：陈天雨冯旭宁欧阳明高卢兰光清华大学汽车安全与节能国家重点实验室北京100084 清华大学核能与新能源技术研究院北京100084

针对锂离子动力电池系统的热安全问题,从电池材料、电池单体、电池系统三个尺度,提出了基于模型的电池系统热安全设计开发总体思路。总结了电池材料热稳定性、电池单体热失控特性、电池系统热失控蔓延特性等的测试表征方法。探讨了建立... 详细信息

针对锂离子动力电池系统的热安全问题,从电池材料、电池单体、电池系统三个尺度,提出了基于模型的电池系统热安全设计开发总体思路。总结了电池材料热稳定性、电池单体热失控特性、电池系统热失控蔓延特性等的测试表征方法。探讨了建立电池热失控的化学反应动力学模型、单体热失控温度与压力预测模型、电池模组热失控蔓延模型过程中需要考虑的因素。利用模型进行仿真分析,可以得到影响电池系统热安全性的主要因素,并指导多尺度热安全设计。

关键词：动力电池系统热安全测试与建模多尺度设计开发模式

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锂离子电池制造工艺仿真技术进展

汽车工程 2023年第9期45卷 1516-1529,1542页

作者：陈飞孔祥栋孙跃东韩雪冰卢兰光郑岳久欧阳明高上海理工大学机械学院上海200093 清华大学汽车安全与节能国家重点实验室北京100084

锂离子电池的综合性能不仅取决于材料和结构的创新,还与制造工艺及相关设备技术的进步息息相关。目前电池制造厂商针对不同体系的电池工艺开发多采用穷举法进行实验试错,在工艺仿真技术方面还存在较大的发展空间。面向电池高质量制造发... 详细信息

锂离子电池的综合性能不仅取决于材料和结构的创新,还与制造工艺及相关设备技术的进步息息相关。目前电池制造厂商针对不同体系的电池工艺开发多采用穷举法进行实验试错,在工艺仿真技术方面还存在较大的发展空间。面向电池高质量制造发展和数智化升级的行业发展趋势,本文结合宏观电池制造设备和微观电池电极结构两个角度,对电池制造工艺仿真研究现状进行了系统总结,分析了各工序工艺仿真技术机理研究、结构发展及应用前景,并进一步指出当前研究的不足及未来的发展趋势,旨在为优化锂离子电池的制造流程和提高其综合性能提供理论参考。

关键词：锂离子电池电极制造电池制造工艺仿真电极微观结构电池制造设备

功率混合型燃料电池汽车动力系统的恒压式能量分配算法

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汽车工程 2007年第2期29卷 101-104,140页

作者：陈超曹桂军卢兰光李建秋欧阳明高清华大学汽车安全与节能国家重点实验室北京100084

分析了功率混合型燃料电池汽车动力系统的特征,给出了功率混合型动力系统能量分配算法的实用设计原则,阐述了该型动力系统适用的恒压能量分配方式,并依据提出的设计原则进行了能量分配算法设计。在燃料电池城市客车“清能3号”的应用中... 详细信息

分析了功率混合型燃料电池汽车动力系统的特征,给出了功率混合型动力系统能量分配算法的实用设计原则,阐述了该型动力系统适用的恒压能量分配方式,并依据提出的设计原则进行了能量分配算法设计。在燃料电池城市客车“清能3号”的应用中,又提出一种分模式控制解决方案。实验证明,所设计的算法能综合考虑动力系统的部件安全性、动力性和经济性,具有一定的应用价值。

关键词：燃料电池汽车混合动力系统能量分配算法

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锂离子电池热失控蔓延研究进展

储能科学与技术 2018年第6期7卷 1030-1039页

作者：陈天雨高尚冯旭宁卢兰光欧阳明高清华大学汽车安全与节能国家重点实验室北京100084 清华大学核能与新能源研究院北京100084

简述了电动汽车锂离子动力电池热失控蔓延机理、建模与抑制技术的最新研究进展。为了满足汽车高能量的要求,需要动力电池进行串并联成组来提供动力。电池组成组安全问题成为电动汽车大规模应用的重要技术问题。电池组中的某一个电池单... 详细信息

简述了电动汽车锂离子动力电池热失控蔓延机理、建模与抑制技术的最新研究进展。为了满足汽车高能量的要求,需要动力电池进行串并联成组来提供动力。电池组成组安全问题成为电动汽车大规模应用的重要技术问题。电池组中的某一个电池单体发生热失控后产生大量热,导致周围电池单体受热产生热失控。因而,电池组成组安全问题的重要关注点是电池组内的热失控蔓延问题。本文对锂离子电池热失控蔓延问题的国内外研究进展进行了综述,分析了对于不同种类锂离子动力电池影响其热失控蔓延特性的主要因素。总结了文献中的热失控蔓延建模方法,并指出了已有方法的不足。从电池系统热安全管理的角度,阐述并分析了热失控蔓延防控技术的研究成果与方向。最后对锂离子电池热失控蔓延研究进行了展望。

关键词：锂离子电池热失控热失控蔓延

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跨国公司对华投资国民待遇问题研究

武汉冶金科技大学学报（社会科学版） 1999年第4期1卷 30-33页

作者：陈宏辉陈宏波武汉科技大学管理学院湖北武汉430081 武汉工业大学蓝光公司湖北武汉430070

跨国投资企业对东道国发挥的经济效应 ,与东道国对跨国投资企业给予的待遇密切相关。介绍外国对其外资企业所采取的待遇标准 ,论述我国对来华投资企业的待遇安排及其产生的效果 ,认为我国当前对来华投资企业实行国民待遇不切实际 ,只能... 详细信息

跨国投资企业对东道国发挥的经济效应 ,与东道国对跨国投资企业给予的待遇密切相关。介绍外国对其外资企业所采取的待遇标准 ,论述我国对来华投资企业的待遇安排及其产生的效果 ,认为我国当前对来华投资企业实行国民待遇不切实际 ,只能逐步向有限制的国民待遇方向发展。

关键词：跨国公司对华投资国民待遇中国政策