电动汽车铅酸蓄电池均衡充电技术试验研究

均衡充电是串联蓄电池充电过程的重要组成部分,讨论了影响阀控铅酸蓄电池性能的均衡充电问题。指出了被动均衡充电,即传统过充电方式的弊端:速度太慢,尤其当单元电池串联块数超过12块更是如此。主动均衡充电优势明显,可加快充电进程,支持故障单元电池或单体电池更换。指出了主动均衡充电能达到10m V/单元电池数量级,可延长蓄电池组使用寿命。适当设计的主动均衡充电可使串联蓄电池组寿命与单元电池寿命一致。     

如何提高小型风力发电机逆变器和蓄电池的可靠性与寿命

本文提出了采用合理的电路拓扑结构、性能良好的功率开关器件、合适的驱动电路和外围隔离电路、可靠的外围保护等措施来提高小型风力发电机逆变器的可靠性与寿命,以及采用高稳定性的控制器、合理匹配容量、避免蓄电池严重亏电运行、设置过充与过放保护等措施来提高小型风力发电机蓄电池的可靠性与寿命。     

江海股份:均线多头排列

正浙商证券预测数据江海股份(002484)进军新材料领域。公司入股VOLTA材料有限公司,VOLTA公司所拥有的专利新材料在理论上和实验室试验中能全面提升超级电容器性能,大幅降低其成本,并能从根本上改善铅酸蓄电池的性能和寿命。薄膜电容2014成长起点。公司薄膜电容通过60     

变电站蓄电池组的运行与维护

从变电站蓄电池结构组成、蓄电池充放电特性,日常维护等方面进行分析,探讨延长蓄电池工作寿命的方法,以及日常维护中应注意的问题与改进措施.     

谈如何正确使用和维护蓄电池

蓄电池是汽车上的重要部件之一.它的性能对汽车性能有着至关重要的影响.如果蓄电池的使用和维护不当,则会大大缩短蓄电池的使用寿命.本文简要分析了蓄电池的常见故障,详细介绍了蓄电池的正确使用以及蓄电池的日常维护.     

矿用蓄电池电机车交流变频调速系统的硬件设计与应用

目前矿用蓄电池电机主要采用直流串激电动机作为牵引电动机,存在调速性能差、能耗大、电池寿命短、机械磨损大等缺点。为此,设计了矿用蓄电池电机车的交流变频调速系统,提出了以永磁同步电动机作为牵引电动机,以DSPTM320F2812作为控制器,实现了变频矢量控制。侧重介绍了变频调速系统的基本原理、变频器主回路、IGBT功率模块的驱动电路和控制单元。应用表明,用交流永磁电动机取代直流电动机,并采用变频调速,提高了电机车的调速性能和运行安全性,降低了能耗,延长了电池寿命,减少了机械磨损。     

谈矿用铅酸蓄电池及其维护

矿用电机车作为重要的煤矿机电运输装备,一直在我国煤矿发展中起到重要作用。铅酸蓄电池在现今的矿用电机车中应用比较广泛。其技术成熟,价格便宜,安全性能基本满足要求;但其电池能量密度低,寿命短,深度循环寿命只有300次左右,因此需要经常得到维护。     

纳米氧化镍在铁镍蓄电池中的性能测试分析

介绍了纳米氧化镍在蓄电池中的研究现状,以及材料研究中常用分析测试技术,制订了纳米氧化镍的制取、性能测试,以及与普通氧化镍蓄电池进行充放电性能比较的研究方案,并给出了分析结果:用纳米氧化镍制作的铁镍蓄电池,其放电性能明显优于普通氧化镍制作的铁镍蓄电池。     

基于单片机的蓄电池监测系统研究与设计

针对蓄电池的基本工作情况,分析和研究了蓄电池的主要性能指标及检测方法,介绍了关键的测量原理与算法以及系统硬件与软件的设计;通过实时监测蓄电池的充放电参数,确保蓄电池正常工作,也便于发现损坏的或者性能显著降低的蓄电池,有益于蓄电池的维护。     

蓄电池在线监测在蓄电池维护中的应用

蓄电池在线监测系统能实时监测蓄电池浮充电压的变化曲线.就此结合蓄电池浮充实时曲线,通过变化曲线来判别蓄电池性能的变化,在一定程度上避免由蓄电池原因引起UPS电源的故障.     

动力型锂离子二次电池市场发展的前景

锂离子二次电池技术近年来发展迅速。动力型锂离子二次电池是电动汽车、电动工具的电力来源,市场前景广阔。本文分析了在目前的电源技术水平下,锂离子二次电池在动力型应用上的优势和缺点,探讨了纯锂离子电池电动汽车所面临的问题以及可能的发展方向,指出在现有技术条件下,混合动力汽车是比较务实的选择。     

电极制备条件对电池电动势测定的影响

影响镀层的质量有多种因素,镀层的质量由其机械、物理和化学性能体现出来,分别通过改变电镀液的组成、电镀时间、电流密度大小等条件电镀铜电极,并与锌电极构成Cu-Zn原电池,采用对消法测定其电池电动势的实验值,与理论值相比较,以选择铜电极电镀的最佳条件.     

Developmental trends in cognitive skills for children diagnosed as autistic and schizophrenic

102 children whose histories included a diagnosis of infantile autism or childhood schizophrenia were followed longitudinally to assess cognitive developmental trends. Despite some sample attrition, administration of a test battery of 5 language skill measures and 2 perception skill measures during 5 test periods over 4 years yielded 336 usable test batteries. After all tests had been administered, diagnosis of subjects for autism and schizophrenia using developmental histories and behavioral observations drawn at the time of first test-battery administration showed 111 test batteries on 33 children diagnosed as autistic, and 100 test batteries on 27 children diagnosed as schizophrenic. Comparisons of age and test score correlations, comparisons of cross-sequential means, and trends for means for diagnostic subgroups and normal controls suggest developmental delay for all skills at all ages for both autistic and schizophrenic children. Findings also suggest a trend for steady prepubertal cognitive skill development, followed by a postpubertal decline in skills for both diagnostic groups.     

A Review on Applications of Layered Phosphorus in Energy Storage

Phosphorus in energy storage has received widespread attention in recent years. Both the high specific capacity and ion mobility of phosphorus may lead to a breakthrough in energy storage materials. Black phosphorus, an allotrope of phosphorus, has a sheet-like structure similar to graphite. In this review, we describe the structure and properties of black phosphorus and characteristics of the conductive electrode material, including theoretical calculation and analysis. The research progress in various ion batteries, including lithium-sulfur batteries, lithium–air batteries, and supercapacitors, is summarized according to the introduction of black phosphorus materials in different electrochemical applications. Among them, with the introduction of black phosphorus in lithium-ion batteries and sodium-ion batteries, the research on the properties of black phosphorus and carbon composite is introduced. Based on the summary, the future development trend and potential of black phosphorus materials in the field of electrochemistry are analyzed.     

Evaluation and Analysis of Battery Technologies Applied to Grid-Level Energy Storage Systems Based on Rough Set Theory

Interest in the development of grid-level energy storage systems has increased over the years.As one of the most popular energy storage technologies currently available,batteries offer a number of high-value opportunities due to their rapid responses,flexible installation,and excellent performances.However,because of the complexity,multifunctionality,and wide deployment of power grids,trade-offs in battery performance exist,especially when considering economics,environmental effects,and safety.Therefore,establishing a comprehensive assessment of battery technologies is an urgent undertaking.In this work,we present an analysis of rough sets to evaluate the integration of battery systems(e.g.,lead-acid batteries,lithium-ion batteries,nickel/metal-hydrogen batteries,zinc-air batteries,and Na-S batteries) into a power grid.Specifically,technological properties,economic significance,environmental effects,and safety of these battery systems are evaluated on the basis of rough set theory.In addition,some perspectives are provided to promote the development of battery technologies for grid-level energy storage.     

基于DS2438的多功能智能蓄电池充电器的设计

介绍了一种基于DS2438智能充电器的设计方案,该智能充电器能对各类蓄电池进行充电,并对充电电池具有自动检测能力.监测芯片将电池的电压、电流、温度等参数通过单总线的方式送到单片机,由单片机AT89S52进行控制,保证蓄电池不过充,以合理的充电方式进行充电,使其蓄电池延长使用寿命.     

LiCo0．95Al0．03Zr0．02O2材料的制备与电化学性能研究

以碳酸锂、四氧化三钴为原料，采用高温固相烧结法制备了锂离子电池正极材料LiCo0．95Al0．03Zr0．02O2,用X-射线衍射（xRD）、扫描电镜（SEM）对材料的结构与形貌进行了表征，并组装实际电池测试了材料的电化学性能．研究结果表明，材料的实际电化学可逆容量达142mAh／g，3．6v以上电压放电容量比例达85％，循环性能好．     

香料烟穿烟方法及调制技术探究

为提高香料烟的品质,在保山市、德宏州香料烟产区进行了多年多点的穿烟方法与调制技术探究.结果表明：云香巴斯玛品种的下部叶穿烟200 ～ 300片/m、中部叶穿烟400 ～ 500片/m、上部叶穿烟500～ 600片/m,沙姆逊品种的下部叶穿烟100～200片/m、中部叶穿烟200～300片/m、上部叶穿烟300～400片/m,调制后品质较好.调制根据烟叶状态,第1～3 d为凋萎变黄期,要求温度为20 ～ 28℃,相对湿度65％ ～ 80％;第4～9d为定色晒制期,温度20 ～50℃,相对湿度40％ ～ 60％;第10 ～ 15 d为干筋期,温度30～55℃,相对湿度35％ ～ 50％.在该范围内,调制后烟叶外观质量好、颜色桔黄、光泽鲜明、油分足,能满足客户需求.     

Electrochemical power sources

The pressing need to alleviate our urban airquality has provided the impetus for electric vehicles. Over the years, a great deal of research and development work has been carried out, and is still underway, on all aspects of electric vehicles especially on improving the power sources, namely the re-chargeable batteries, fuel cells and electrochemical supercapacitors. The developments in rechargeable batteries for electric vehicles are reflected in this part of the article while fuel cells and electrochemical supercapacitors will be described in Part 2 of the article.     

Experiences in the Application of Item Response Theory in Test Construction

Certain potential benefits of using item response theory in test construction are discussed and evaluated using the experience and evidence accumulated during 9 years of using a three-parameter model in the construction of major achievement batteries. We also discuss several cautions and limitations in realizing these benefits as well as issues in need of further research. The potential benefits considered are those of getting "sample-free" item calibrations and "item-free" person measurement, automatically equating various tests, decreasing the standard errors of scores without increasing the number of items used by using item pattern scoring, assessing item bias (or differential item functioning) independently of difficulty in a manner consistent with item selection, being able to determine just how adequate a tryout pool of items may be, setting up computer-generated "ideal" tests drawn from pools as targets for test developers, and controlling the standard error of a selected test at any desired set of score levels.