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State-of-Health Map of Lithium-ion Batteries Established by ICE Map Approach

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Journal of Harbin Institute of Technology(New Series) 2022年第3期29卷 57-66页

作者： Lin He Mingwei Wang yujiang wei Pengcheng Rui Shengjie Yu Qin Shi Laboratory of Automotive Electrification and Intelligent Connection Hefei University of TechnologyHefei 230009China School of Automotive and Traffic Engineering Hefei University of TechnologyHefei 230009China

State-of-health(SOH) is one of the main factors for lithium-ion batteries that indicate their life information. Thus it is essential to estimate SOH accurately during the operation of lithium-ion batteries. In this paper, an SOH map is proposed to illustrate the SOH of lithium-ion batteries by an internal combustion engine(ICE) map approach. Both direct current internal resistance(DCR) and open circuit voltage(OCV) are key parameters of lithium-ion batteries, which are obtained through metering and computing. Due to serious affection by environmental temperature, temperature translation is proposed to translate DCR/OCV of different temperature into a nominal value at 25 ℃. Compared with ICE map, SOH map is illustrated by the nominal DCR and OCV, which can be looked up to get a nominal SOH. In the SOH map, a pair of the DCR and the OCV can only map out a unique SOH, which is beneficial for application in engineering practice in most cases.

关键词： lithium-ion batteries state-of-health ICE map nominal SOH SOH map

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基于分数阶模型的锂离子电池荷电状态估计

机械工程学报 2024年第8期60卷 224-232,244页

作者：石琴蒋正信刘翼闻魏宇江胡晓松贺林合肥工业大学汽车与交通工程学院合肥230009 自动驾驶汽车安全安徽省重点实验室合肥230009 安徽省智慧交通车路协同工程研究中心合肥230009 重庆大学机械与运载工程学院重庆400044

荷电状态精确估计是锂离子动力电池安全应用的关键技术之一,现有的估计方法并不完全适配锂离子电池系统,在准确性、稳定性和实用性方面均有较大的提升空间。为了准确描述锂离子电池系统动态特性并且提升估计精度与稳定性,提出一种基于... 详细信息

荷电状态精确估计是锂离子动力电池安全应用的关键技术之一,现有的估计方法并不完全适配锂离子电池系统,在准确性、稳定性和实用性方面均有较大的提升空间。为了准确描述锂离子电池系统动态特性并且提升估计精度与稳定性,提出一种基于分数阶电池模型的自适应扩展卡尔曼粒子滤波方法。在采用免疫遗传算法对锂离子电池分数阶模型进行参数辨识的过程中,应用“记忆库”减小算法计算量,引入“亲和度”缓解算法陷入局部最优解的问题。采用基于模型开发的手段,将提出的控制算法下载到电池管理系统控制器中,经过ECE和UDDS工况测试对比验证:二阶分数阶电路模型的端电压误差最大不超过13.96 mV,平均误差为2.4~4.2 mV,表明分数阶模型对电流的变化更为敏感且更能表现电池的电压变化性能,可以有效保证电池荷电状态的计算精度。提出方法较EKF的荷电状态估计精度提升50%以上,并且收敛时间大大缩短,表明在粒子滤波中引入自适应卡尔曼滤波进行校正,可以滤除噪声、增强估计算法准确性和鲁棒性。

关键词：电池荷电状态分数阶电池模型自适应卡尔曼粒子滤波免疫遗传算法

State of charge estimation by square root cubature particle filter approach with fractional order model of lithium-ion battery

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Science China(Technological Sciences) 2022年第8期65卷 1760-1771页

作者： LIU YiWen SHI Qin wei yujiang HE ZeJia HU XiaoSong HE Lin School of Automotive and Transportation Engineering Hefei University of TechnologyHefei 230009China The State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China Laboratory of Automotive Intelligence and Electrification Hefei University of TechnologyHefei 230009China

In this paper, a square root cubature particle filter approach was designed to estimate the state of charge of lithium-ion battery,which not only enhanced the numerical stability and guaranteed positive definiteness of the state covariance, but also increased accuracy and decreased computation quantity. Due to the fractional characteristics of the battery capacitance, a fractional order model was used to formulate the lithium-ion battery. Considering the high accuracy and easy convergence, a particle swarm optimization algorithm was utilized to identify the model parameters. The above-mentioned approach was modelled and translated into C code, which was downloaded into battery control unit of battery management system for experimental validation. Two kinds of dynamic cycles were utilized to validate the proposed approach at different temperatures, where both unscent Kalman filter and cubature Kalman filter were compared with the proposed approach. Experimental results indicate that the proposed approach has better accuracy and robustness, and fractional order model is more accurate than integer order model.Therefore, the square root cubature particle filter with fractional order model of lithium-ion battery is a good candidate to estimate the state of charge.

关键词： battery management system integer order model particle filter unscent kalman filter cubature Kalman filter

High cerium content(Nd-Pr-Ce)_(2)Fe_(14)B melt-spun ribbons with high coercivity

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Journal of Rare Earths 2024年第4期42卷 690-695页

作者： yujiang Zhong Junming Wang Zikai Yuan Ruijin Liu Minggang Zhu Zhe Liu Xin Chen wei Li Zhaohui Guo Division of Functional Materials Central Iron and Steel Research InstituteBeijing100081China Ningbo Jinji Strong Magnetic Material Co. Ltd.Ningbo315172China Jiangxi Jiangwu Rare Metal New Material Co. Ltd.Nanchang330013China

The effects of wheel speeds on the magnetic properties and microstructures of[(Nd,Pr)_(1-x)Ce_(x)]-Fe-B meltspun ribbons were investigated.Compared to melt-spun ribbons with low cerium(Ce)content(x=0.2),amorphous formation can be suppressed at high wheel speed in the ribbons with a relatively high Ce content(x=0.8),and with the increase of the wheel speed,the magnetic properties of the ribbons with high Ce content raise continuously.At high wheel speed,the coercivity mechanism of melt-spun ribbons is mainly pinning field,and the high wheel speed introduces a large number of defects into the matrix as pinning sites.Furthermore,ribbons with high Ce content form a fine and uniform grain structure,so the grain boundary area enlarges,which further hinders the movement of domain walls.The combined effects of the above factors enable ribbons with high Ce content to have excellent magnetic properties(Hcj=0.977 T,Mr=64 m^(2) A/kg)at the wheel speed of 35 m/s.

关键词： Wheel speed Cecontent Microstructure Magnetic properties Rare earths

State of charge estimation by finite difference extended Kalman filter with HPPC parameters identification

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Science China(Technological Sciences) 2020年第3期63卷 410-421页

作者： HE Lin HU MinKang wei yujiang LIU BingJiao SHI Qin Automotive Research Institute Hefei University of TechnologyHefei 230009China School of Automotive and Transportation Engineering Hefei University of TechnologyHefei 230009China

State of charge(SOC) is a key parameter of lithium-ion battery. In this paper, a finite difference extended Kalman filter(FDEKF)with Hybrid Pulse Power Characterization(HPPC) parameters identification is proposed to estimate the SOC. The finite difference(FD) algorithm is benefit to compute the partial derivative of nonlinear function, which can reduce the linearization error generated by the extended Kalman filter(EKF). The FDEKF algorithm can reduce the computational load of controller in engineering practice without solving the Jacobian matrix. It is simple of dynamic model of lithium-ion battery to adopt a secondorder resistor-capacitor(2 RC) network, the parameters of which are identified by the HPPC. Two conditions, both constant current discharge(CCD) and urban dynamometer driving schedule(UDDS), are utilized to validate the FDEKF algorithm.Comparing convergence rate and accuracy between the FDEKF and the EKF algorithm, it can be seen that the former is a better candidate to estimate the SOC.

关键词： state of charge lithium-ion battery parameters identification finite difference algorithm extended Kalman filter

鲁中南典型地热区地热水氟分布特征及其驱动机制

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地质科技通报 2024年第3期43卷 36-47页

作者：李曼张薇廖煜钟刘峰魏帅超何雨江中国地质科学院水文地质环境地质研究所石家庄050061 自然资源部地热与干热岩勘查开发技术创新中心石家庄050061

山东省鲁中南典型地热区主要包括沂沭断裂带地热区和鲁中隆起地热区,为了探明研究区地热水氟分布特征及其富集规律,综合运用水化学图解、地球化学模拟和主成分分析等方法,分析沂沭断裂带地热区和鲁中隆起地热区地热水水化学数据。结果表... 详细信息

山东省鲁中南典型地热区主要包括沂沭断裂带地热区和鲁中隆起地热区,为了探明研究区地热水氟分布特征及其富集规律,综合运用水化学图解、地球化学模拟和主成分分析等方法,分析沂沭断裂带地热区和鲁中隆起地热区地热水水化学数据。结果表明:研究区地热水以Na-Ca-Cl型、Na-Ca-SO_(4)-Cl型和Na-Cl^(-)SO 4型为主,基本为弱碱性水,优势阳离子为Na^(+),氟质量浓度在0.38~4.5 mg/L之间,富钠弱碱性环境有利于地热水中氟的富集。地热水中F-质量浓度与Na^(+)、Cl^(-)和总溶解固体(TDS)质量浓度呈显著正相关,而沂沭断裂带地热水样中F-质量浓度还与K^(+)、SO_(4)^(2-)质量浓度呈显著正相关,与Mg^(2+)和HCO_(3)质量浓度呈显著负相关;鲁中隆起地热区地热水中阳离子交换作用较沂沭断裂带地热区更为强烈,Na^(+)反应强度明显强于Mg^(2+)。鲁中隆起地热区和沂沭断裂带地热区均为裂隙型热储,热储岩性分别为石灰岩、灰岩热蚀变带和安山岩破碎带,水岩作用强烈。研究区地热水中氟离子的物质来源主要为萤石等含氟矿物的溶解沉淀,受控于阳离子交换等水岩相互作用影响,最终形成高氟地热水,其中高温和富钠对研究区地热水中氟离子富集影响较大。研究成果为地热资源开发利用提供了参考。

关键词：氟鲁中隆起地热区沂沭断裂带地热区地热水水岩作用驱动机制裂隙型热储

基于Joinpoint和年龄-时期-队列模型的1990-2019年中国伤寒副伤寒发病和死亡趋势分析

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中国预防医学杂志 2024年第1期25卷 102-107页

作者：魏文宇孙静陈昱名张渝疆新疆医科大学公共卫生学院新疆维吾尔自治区乌鲁木齐830054 新疆维吾尔自治区疾病预防控制中心消毒与感染控制中心

目的分析中国伤寒/副伤寒发病率、死亡率随年龄、时期和出生队列的变化趋势,为制定伤寒副伤寒防控政策提供理论依据。方法从全球疾病负担(Global Burden of Disease,GBD) 2019数据库中获取我国1990-2019年全年龄段发病率和死亡率数据... 详细信息

目的分析中国伤寒/副伤寒发病率、死亡率随年龄、时期和出生队列的变化趋势,为制定伤寒副伤寒防控政策提供理论依据。方法从全球疾病负担(Global Burden of Disease,GBD) 2019数据库中获取我国1990-2019年全年龄段发病率和死亡率数据。应用连接点回归(join point regression,JPR)模型进行分段时间趋势分析;应用年龄-时期-队列(age-period-cohort,APC)模型分别探讨年龄、时期及队列对伤寒副伤寒发病率、死亡率的影响。结果 JPR结果显示,1990-2019年中国伤寒副伤寒发病率、死亡率整体均呈下降趋势,年平均下降率为4.20%和4.50%。APC模型结果显示,1990-2019年中国伤寒副伤寒发病和死亡风险随年龄增长先增高后降低,并在10~<15岁年龄段达到最大值,25岁趋于平稳;时期效应表明,伤寒副伤寒发病和死亡风险随着年份推移持续降低,30年间发病风险值由1.65降至0.65,死亡风险值由1.66降至0.61;队列效应表明,发病、死亡风险随年代推移而增加,发病、死亡风险值在1990-1994年队列至2015-2019年队列分别由0.60和0.53增长至1.90和1.99。结论中国伤寒副伤寒发病和死亡率总体呈下降趋势,发病和死亡风险随年龄增长先升高后降低,随时期推移而降低,随出生队列推移而升高。应对易感人群做好健康教育,降低我国伤寒副伤寒疾病负担。

关键词：伤寒副伤寒连接点回归模型年龄-时期-队列模型全球疾病负担趋势分析

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阿托品联合短时遮盖治疗弱视的疗效观察

中国实用眼科杂志 2009年第1期27卷 36-38页

作者：廖妙云彭燕一韦育江桂林医学院附属医院眼科桂林541001

目的探讨阿托品联合短时遮盖治疗弱视的疗效。方法回顾性分析随机抽取的弱视治疗病例99例110只眼。18个月观察期内按遮盖治疗方式分为三组：A组：每天遮盖不少于8h；B组：周一至周五每日遮盖3～4h，周六、周日每天遮盖8h；C组：优势眼... 详细信息

目的探讨阿托品联合短时遮盖治疗弱视的疗效。方法回顾性分析随机抽取的弱视治疗病例99例110只眼。18个月观察期内按遮盖治疗方式分为三组：A组：每天遮盖不少于8h；B组：周一至周五每日遮盖3～4h，周六、周日每天遮盖8h；C组：优势眼每日滴阿托品眼液一次，连续用药15d，停药15d，并每日遮盖优势眼4h。结果中度、重度弱视，屈光参差性弱视c组疗效优于A组，差异有统计学意义（中度弱视t：2．2272，P＜0．05；重度弱视t=2．8110，P＜0．01；屈光参差性弱视t=2．9722，P＜0．01）。视力提高程度C组高于A组，差异有统计学意义。疗程上C组较A、B组缩短，差异有统计学意义（B组与C组：X^2=9．413，P＜0．01；A组与c组：×^2=14．7489，P＜0．01）。结论阿托品联合短时遮盖有利于提高弱视治疗依从性，缩短疗程，提高治愈率。

关键词：阿托品遮盖治疗弱视

腰痛康汤结合PVP治疗骨质疏松性椎体压缩骨折临床观察

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光明中医 2024年第2期39卷 284-287页

作者：于通李巍刘玉江山东中医药大学第一临床医学院山东济南250014 青岛大学附属海慈医院(青岛市中医医院脊柱外科) 山东青岛266000

目的探讨骨质疏松性椎体压缩骨折(OVCF)行经皮椎体成形术(PVP)后于常规治疗上加用腰痛康汤的临床疗效。方法选取行PVP手术的OVCF患者70例,随机分为治疗组和对照组各35例。对照组术后予碳酸钙D3片、骨化三醇常规治疗。治疗组于对照组... 详细信息

目的探讨骨质疏松性椎体压缩骨折(OVCF)行经皮椎体成形术(PVP)后于常规治疗上加用腰痛康汤的临床疗效。方法选取行PVP手术的OVCF患者70例,随机分为治疗组和对照组各35例。对照组术后予碳酸钙D3片、骨化三醇常规治疗。治疗组于对照组上加服腰痛康汤治疗。比较2组患者治疗前后各时期视觉模拟评分(VAS评分)、骨密度(BMD)值、IL-6及TNF-α水平。结果治疗组总有效率显著高于对照组(P0.05)。BMD术后6个月时治疗组高于对照组,VAS及IL-6术后3 d、1周时治疗组低于对照组(P<0.05)。结论 OVCF行PVP后于常规治疗上加服腰痛康汤对减轻中期疼痛、提升BMD、改善IL-6有积极疗效,值得推广。

关键词：骨痿骨质疏松压缩性骨折腰痛康汤