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Journal of Energy Chemistry 2024年第2期89卷 195-207,I0006页

作者： Zhuangzhuang Jia Yuanyuan Min Peng Qin Wenxin Mei Xiangdong Meng Kaiqiang Jin jinhua sun Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Gotion High-Tech Co. Ltd.Hefei 230012AnhuiChina

The safety valve is an important component to ensure the safe operation of lithium-ion batteries(LIBs).However,the effect of safety valve type on the thermal runaway(TR)and gas venting behavior of LIBs,as well as the TR hazard severity of LIBs,are not *** this paper,the TR and gas venting behavior of three 100 A h lithium iron phosphate(LFP)batteries with different safety valves are investigated under *** to previous studies,the main contribution of this work is in studying and evaluating the effect of gas venting behavior and TR hazard severity of LFP batteries with three safety valve *** significant results are obtained:(Ⅰ)the safety valve type dominates over gas venting pressure of battery during safety venting,the maximum gas venting pressure of LFP batteries with a round safety valve is 3320 Pa,which is one order of magnitude higher than other batteries with oval or cavity safety valve;(Ⅱ)the LFP battery with oval safety valve has the lowest TR hazard as shown by the TR hazard assessment model based on gray-fuzzy analytic hierarchy *** study reveals the effect of safety valve type on TR and gas venting,providing a clear direction for the safety valve design.

关键词： Lithium iron phosphate battery Safety valve Thermal runaway Gas venting behavior Thermal runaway hazard severity Gray-fuzzy analytic hierarchy process

Early warning method for thermal runaway of lithium-ion batteries under thermal abuse condition based on online electrochemical impedance monitoring

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Journal of Energy Chemistry 2024年第5期92卷 74-86页

作者： Yuxuan Li Lihua Jiang Ningjie Zhang Zesen Wei Wenxin Mei Qiangling Duan jinhua sun Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of ChinaAnhui 230026HefeiChin

Early warning of thermal runaway(TR)of lithium-ion batteries(LIBs)is a significant challenge in current application *** and effective TR early warning technology is urgently required considering the current fire safety situation of *** this work,we report an early warning method of TR with online electrochemical impedance spectroscopy(EIS)monitoring,which overcomes the shortcomings of warning methods based on traditional signals such as temperature,gas,and pressure with obvious delay and high *** in-situ data acquisition through accelerating rate calorimeter(ARC)-EIS test,the crucial features of TR were extracted using the RReliefF *** mechanisms corresponding to the features at specific frequencies were ***,a three-level warning strategy for single battery,series module,and parallel module was formulated,which can successfully send out an early warning signal ahead of the self-heating temperature of battery under thermal abuse *** technology can provide a reliable basis for the timely intervention of battery thermal management and fire protection systems and is expected to be applied to electric vehicles and energy storage devices to realize early warning and improve battery safety.

关键词： Online EIS measurement Lithium-ion batterysafety Multistage thermal runaway early warning Sensitivityanalysis

主动电磁轴承支承的高速电动机总成热平衡分析

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轴承 2024年第7期 28-35页

作者：王鹏鹏孙进华李栋杰张钢上海大学机电工程与自动化学院上海200444

以一台由主动电磁轴承支承的某型卧式离心鼓风机为研究对象,对其电动机总成的电磁场进行仿真,得到电动机和主动电磁轴承的损耗分布,根据该鼓风机的三维模型提取空气域,分析不同风冷散热方式下冷却空气在其内部的流动情况,再运用Fluent... 详细信息

以一台由主动电磁轴承支承的某型卧式离心鼓风机为研究对象,对其电动机总成的电磁场进行仿真,得到电动机和主动电磁轴承的损耗分布,根据该鼓风机的三维模型提取空气域,分析不同风冷散热方式下冷却空气在其内部的流动情况,再运用Fluent对电动机总成温度场进行仿真,将得到的温度场仿真结果与试验结果进行对比,结果表明:电动机、径向主动电磁轴承、轴向主动电磁轴承的铜损耗率最高分别为768180,124590,281700 W/m^(3);双口直接通风加水冷散热和单口混合通风加水冷散热的仿真结果与试验结果的最大误差分别为4.15%和5.48%,单口混合通风加水冷的散热效果更好,验证了单向磁-热耦合温度场分析方法的合理性。

关键词：滑动轴承磁力轴承电动机温度场能量损耗散热有限元分析

Correlating electrochemical performance and heat generation of Li plating for lithium-ion battery with fluoroethylene carbonate additive

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Journal of Energy Chemistry 2022年第11期31卷 446-453,I0012页

作者： Wenxin Mei Lihua Jiang Hongmin Zhou jinhua sun Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026AnhuiChina

*** With the superior performance of high energy density,lightweight and long life span,lithium-ion battery(LIB)are perceived as an attractive and reliable power source for modern-used portable electronics,ecofriendly electric vehicles and power distribution,and thereby a remarkable solution to assuage energy dependence on fossil fuel and environmental ***,the unexpected Li plating together with the Li dendrites growth on graphite anode surface has been a profound hindrance to the practical application of LIB,of which induces inferior Coulombic efficiency,poor lifespan and safety concern[1].

关键词： Lithium-ion battery safety Li plating Li stripping Fluoroethylene carbonate Heat generation

Insight into the structural evolution and thermal behavior of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode under deep charge

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Journal of Energy Chemistry 2022年第2期31卷 424-432页

作者： Chen Liang Lihua Jiang Zesen Wei Wenhua Zhang Qingsong Wang jinhua sun State Key Laboratory of Fire Science University of Science and Technology of Chin1Hefei 230026AnhuiChina National Synchrotron Radiation Laboratory University of Science and Technology of Chin1Hefei 230026AnhuiChina

By virtue of the crucial effect of the crystal structure and transition metal(TM)redox evolution on the performance of LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM)cathode,systematical investigation is carried out to better understand the charge mechanism upon deep *** on the results of X-ray diffraction and highresolution transmission electron microscope,phase transformations existing on particle surface are promoted by high potential because of the deeper lithium vacancies,accompanied by more substantial structure *** X-ray absorption spectroscopy indicates that Ni acts as the major contributor to charge compensation while Co displays a remarkable redox activity over the deep charge *** elevated integrated intensity of pre-edge in O K-edge spectra reveals the extensive amount of holes formed in O 2 p orbitals and the enhanced hybridization of TM 3 d-O 2 p *** the close relationship between thermal behavior and structural evolution,the tendency of phase transitions and O_(2) release upon heating is accelerated by voltage rise,demonstrating the aggravated instability due to deeper Li *** Li contents in NCM are employed to estimate the amount of oxygen released in structural transformation and its detrimental effect on stability declares Li contentdependent ***,the extended Li vacancies,higher proportion of Ni4+and stronger orbital hybridization are considered as three factors impeding the thermal stability of the highlydelithiated NCM.

关键词： Lithium ion battery safety Overcharge Soft X-ray absorption spectroscopy Thermal property Cathode material

The efficiency and toxicity of dodecafluoro-2-methylpentan-3-one in suppressing lithium-ion battery fire

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Journal of Energy Chemistry 2022年第2期31卷 532-540页

作者： Yujun Liu Kai Yang Mingjie Zhang Shi Li Fei Gao Qiangling Duan jinhua sun Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijing 100192China

Currently,the effective and clean suppression of lithium-ion battery(LIB)fires remains a *** present work investigates the use of various inhibitor doses(Xin)of dodecafluoro-2-methylpentan-3-one(C_(6) F_(12)O)in 300 Ah LIBs,and systematically examines the thermal and toxic hazards of the extinguished batteries via real scale combustion and gas *** inhibitor is shown to be completely *** inhibition mechanism involves a combination of chemical inhibition and physical *** the chemical inhibition effect tends to saturate with increasing Xin,the physical cooling remains effective at higher inhibitor ***,extinguishing the battery fire with a high Xin of C_(6)F_(12)O is found to incur serious toxicity *** results are expected to provide a guideline for the design of inhibitor doses for the suppression of LIB fires.

关键词： Lithium ion battery safety Thermal runaway Fire suppression C_(6)F_(12)O

正方形泄放口尺寸对高压氢气泄漏激波传播与自燃特性的影响研究

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火灾科学（中英文） 2024年第1期33卷 1-9页

作者：吴云帆段强领汤静蒋光波曾倩张嵩林金凯强孙金华中国科学技术大学火灾科学国家重点实验室合肥230026

实验研究了高压氢气从不同尺寸泄放口释放到管道中的激波传播特性和自燃发生规律,采用了三种尺寸的正方形泄放口,面积分别为113 mm^(2)(开口率λ=4/5),75 mm^(2)(λ=2/3),49 mm^(2)(λ=1/2)。结果表明,开口率的减小会削弱管道内激波的... 详细信息

实验研究了高压氢气从不同尺寸泄放口释放到管道中的激波传播特性和自燃发生规律,采用了三种尺寸的正方形泄放口,面积分别为113 mm^(2)(开口率λ=4/5),75 mm^(2)(λ=2/3),49 mm^(2)(λ=1/2)。结果表明,开口率的减小会削弱管道内激波的强度和传播速度,并抑制激波在向下游传播过程中的发展。同时发现,随着开口率的减小,氢气自燃所需的最小泄放压力增大。进一步,当开口率减小时,氢气自燃的整体火焰强度减弱,火焰传播速度减小。特别是在开口率较小的条件下(λ=1/2),当泄放压力增大时,管道内最大火焰强度未有明显增长,表明开口率减小对整体火焰强度有一定的抑制作用。

关键词：高压氢气泄漏开口率激波自燃

香蕉枯萎镰刀菌4号生理小种FoSP1基因功能的初步分析

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热带作物学报 2024年第7期45卷 1332-1339页

作者：赵久娟李敏胡美姣杨锦玉何颖柳志强孙进华中国热带农业科学院环境与植物保护研究所海南海口571101 海南大学生命健康学院海南海口570228 海南大学热带农林学院海南海口570228 贵州大学精细化工研究开发中心贵州贵阳550025

香蕉枯萎病是我国香蕉生产中危害最大,且难以防治的一种真菌病害。由于香蕉枯萎病的影响,我国近年来香蕉种植面积逐年减少,给我国亚热带、热带香蕉产业带来了巨大的经济损失。该病害是由于香蕉的维管束受到病原菌尖孢镰刀菌古巴专化型(F... 详细信息

香蕉枯萎病是我国香蕉生产中危害最大,且难以防治的一种真菌病害。由于香蕉枯萎病的影响,我国近年来香蕉种植面积逐年减少,给我国亚热带、热带香蕉产业带来了巨大的经济损失。该病害是由于香蕉的维管束受到病原菌尖孢镰刀菌古巴专化型(Fusarium oxysporum ***,Foc)入侵而发生,其繁殖速度快,引起香蕉叶片黄化和植株萎蔫。通过比较Foc1号生理小种(Foc1)N2菌株和4号生理小种(Foc4)B2菌株的基因组及转录组序列,筛选出位于基因组特异区间并且表达量较高的分泌蛋白FoSP1。结果表明:FoSP1基因开放阅读框为387 bp,编码129个氨基酸,其信号肽切割位点位于第20~21位氨基酸残基之间,且该蛋白无任何已知的结构域和功能位点,因此推断出FoSP1是一个新的分泌蛋白。为了研究该蛋白在Foc4菌株中的生物学作用,本研究利用split-marker的方法敲除了B2菌株的FoSP1基因,并对获得的正确敲除突变体进行表型分析和致病性测定。结果表明:相比野生型B2菌株,FoSP1基因敲除突变体菌丝的营养生长无显著差异,对NaCl、山梨醇和H2O2等外源胁迫均表现不敏感,但敲除突变体的产孢量和分生孢子萌发率显著降低,且对巴西蕉苗的致病力明显减弱。由此推测分泌蛋白FoSP1不参与Foc4菌株B2的营养生长,但在其产孢及致病的过程中发挥着重要作用。此结果为进一步研究Foc4基因组特异区间分泌蛋白的致病机制奠定基础。

关键词：尖孢镰刀菌古巴专化型 FoSP1 分泌蛋白基因敲除致病性

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基于多视角三维航摄影像的树高提取方法比较

河南科学 2024年第7期42卷 1043-1049页

作者：杨柳袁亚博孙金华赵辉王婷张磊河南农业大学林学院郑州450002 河南省林业科学研究院郑州450008

树高是一个重要的立木调查因子,传统树高测量方法是利用测高器人工测量,该方法调查速度慢,效率低下.重叠的立体像对,可以反映地物的高度信息,为大面积树高信息提取提供了可能.本研究采用大疆Phantom 4 RTK无人机获取研究区航摄影像并构... 详细信息

树高是一个重要的立木调查因子,传统树高测量方法是利用测高器人工测量,该方法调查速度慢,效率低下.重叠的立体像对,可以反映地物的高度信息,为大面积树高信息提取提供了可能.本研究采用大疆Phantom 4 RTK无人机获取研究区航摄影像并构建立体像对,分别从不同视角采用三维模型直接测量法、倾斜摄影点云提取法、冠层高度模型局部最大值法进行了树高信息提取.研究结果表明,三种方法林木检测率依次为:82.5%、76.8%、71.1%,测得的树高结果精度分别为:R2=0.730,RMSE=1.699;R2=0.804,RMSE=1.459;R2=0.766,RMSE=1.548.三维模型测量法获取的树高提取率最高,倾斜摄影点云提取的树高值与实测值的拟合度最高.研究结果利用航摄影像能够高效地提取树高信息,为林业研究调查提供一种低成本、高效率的方法.

关键词：树高航摄影像倾斜摄影局部最大值冠层高度模型数字高程模型

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基于无人机倾斜摄影的三维绿量估算

河南科学 2024年第5期42卷 694-704页

作者：朱启梦孙金华杨柳王婷赵辉张磊河南农业大学林学院郑州450002 河南省林业科学研究院郑州450008

精准、快速、高效的绿化效果评估是现代林业发展的重要要求.针对传统方法绿地覆盖率无法反映绿化空间垂直结构的缺点,提出基于切片凸包算法利用倾斜摄影点云估测三维绿量的新方法,以河南农业大学文化路校区为研究区域,通过三种方法估算... 详细信息

精准、快速、高效的绿化效果评估是现代林业发展的重要要求.针对传统方法绿地覆盖率无法反映绿化空间垂直结构的缺点,提出基于切片凸包算法利用倾斜摄影点云估测三维绿量的新方法,以河南农业大学文化路校区为研究区域,通过三种方法估算不同树种及树形的三维绿量,对比不同方法的测算精度,探索最优估算方法.利用无人机进行多光谱成像和倾斜摄影成像,通过面向对象的方法在数字正射影像基础上提取林木,结合实测33个树种的冠径、冠高等信息,分别利用冠径-冠高方程法(D-H)、实景三维模型法(3D)和基于切片凸包算法的点云体积测算法(PC)进行三维绿量测算.结果表明,三种方法测算值与实测值拟合的回归方程R2分别为0.84、0.92、0.94,RMSE分别为168.85、90.74、78.46 m^(3),精度分别为62.67%、87.26%、90.19%;优势树种悬铃木三维绿量最大,龙爪槐值最小;PC法测算水杉和球形树的相对误差最小,分别为0.56%和1.27%.利用倾斜摄影点云的切片凸包算法测算三维绿量具有可行性且最精准,为筛选不同树种及树形的三维绿量估算方法的选择上提供科学依据.

关键词：三维绿量无人机倾斜摄影点云切片凸包算法

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