适用于故障特性分析的锂离子电池储能电磁暂态建模方法

为促进新能源的消纳利用,锂离子电池储能系统(LiBESS)在电网中得到了广泛应用,进一步导致电网故障特征更加复杂。为此,提出一种LiBESS电磁暂态建模方法。在分析故障特征的基础上,建立了功率变流器系统(PCS)模型和兼顾电池外特性、荷电状态的锂离子电池模型。PCS控制策略引入了故障穿越控制环和负序控制环,实现了故障穿越并消除了直流母线电压波动。此外,通过机理分析和仿真验证明确了LiBESS在不同充放电模式下的故障特性差异。最后,基于PSCAD/EMTDC的电磁暂态仿真和基于实时数字仿真器的硬件在环测试验证了所提建模方法的有效性。

锂离子电池储能电站消防安全防范

锂离子电池储能在电化学储能领域占据了绝对主导地位,因此,针对锂电池储能电站的火灾问题,提出在锂离子电池热失控初期、热失控阶段和热失控后期的预防措施和对储能电站的消防改进建议。

锂离子电池储能安全管理中的机器学习方法综述

随着当前电化学储能技术的广泛应用,电池储能电站的安全运维问题日渐突出。传统电池管理系统仅能获得各电池单体的电压、电流及温度,并且受限于硬件处理能力、数据传输带宽及延迟等条件,掌握海量电池单体储能系统的健康与安全运行状态成为关键技术难题。机器学习方法在锂离子电池运行状态预测领域的应用为储能电池系统安全管理创造了条件。针对锂离子电池安全管理需求,首先对锂离子电池滥用及热失控风险机理的相关研究进行了介绍。随后,讨论了锂离子电池管理系统架构及其应用特点,并详细论述了机器学习方法在锂离子电池健康与安全状态分析方面的应用。最后,对储能电站锂离子电池的安全管理进行了展望。

锂离子电池储能系统的设计与充电管理策略研究

为了实现锂离子电池储能系统的有效能量管控,首先对由大量锂离子电池组成的储能系统的组织结构设计进行了研究,提出了分组、分层次、自治的设计方法;然后针对设计的电池储能系统提出了一种基于电池荷电状态(SOC)的充电管理策略,以提高其充电效率,延长其使用寿命,保证其长期稳定运行。实验结果表明,该管理策略可以有效提高锂离子电池储能系统的充电效率。

锂离子电池储能产业发展现状与对策建议

在碳中和背景下,我国正在构建以新能源为主体的电力系统。根据全球储能行业发展现状,锂离子电池储能因响应速度快、应用场景灵活、电性能等优势脱颖而出,是最具有大规模应用前景的一种新型储能技术。本文分析了当前储能产业的现状,预测锂电储能领域的发展趋势,针对锂电储能发展面临的问题提出对策与建议。

锂离子电池储能系统的退役电池筛选与优化分组再利用方法

探讨了锂离子电池储能系统的退役电池筛选与优化分组再利用方法,包括建立判断退役电池可用性的核心参量、确立退役电池可用性核心参量判据、建立退役电池可用性核心参量判据赋值权重,并根据电池成组方式及电池组规格选择合适的梯次利用目标应用场合。依据上述评价方法,建立了可用性评价标准。与现有技术相比,该方法测量参数较少、简便高效、评价结果可靠,实现了对锂离子电池储能系统退役电池的高效筛选与优化分组再利用。

以安全高质量应用为导向的储能锂离子电池综合性能评价标准

作为支撑智能电网和能源转型发展的关键技术,储能受到广泛关注,其中以锂离子电池为代表的电池储能成为大规模储能的首选储存载体之一。然而随着电池储能应用规模逐渐增加,暴露出储能系统在质量和安全方面存在诸多问题和风险,电池储能系统作为电气设备整机产品目前还不成熟,储能电站的整体安全与质量状态存在不确定性,导致目前大量已建储能电站利用率偏低。由于设备整机产品还处于不成熟、不断迭代发展过程中,为提升现阶段锂离子电池储能电站的应用水平,以安全高质量应用为导向,围绕储能用锂离子电池这个核心部件开展综合性能评价显得尤为重要。本文主要梳理了国内储能锂离子电池相关标准的最新进展,对锂离子电池储能核心标准的重要内容和该标准对行业发展的作用进行了详细分析。结合电池储能特性评价和检测技术研究积累,提出了涵盖型式试验、等级评价、到货抽检、并网检测及运行考核检测的电池储能全流程检测评价整体解决方案,通过对各个环节的详细分析表明该方案可以实现对投运的涉及电网运行的电网侧、电源侧、用户侧储能设备全链条全环节闭环管理,对于提升电池储能设备投运前的标准化规范化水平、提高储能电站运行可靠性、降低储能电站安全风险具有重要意义。

地面式锂电池储能系统抑制牵引网压波动研究

目前,大多数城市轨道交通列车使用车载电阻来吸收再生制动能量,这带来了诸如列车重量大、隧道温度升高和能源浪费等问题,提出利用地面式锂离子电池储能系统代替车载电阻,对其特点、工作原理、结构及功能进行分析,并对锂离子电池系统的充放电控制策略进行研究。通过MATLAB/SIMULINK搭建仿真平台,结果表明,锂电池储能系统可以有效地抑制城市轨道交通牵引网电压波动和防止再生失效等问题。

格尔木时代新能源50MWp光伏/15MW电池储能联合电站集成技术研究与应用

格尔木时代新能源50MWp并网光伏电站是国内首座规模最大的商业化光储联合电站,包含50MWp光伏电站及15MW/18MWh锂离子电池储能电站。文章重点阐述了光伏发电系统、锂电池储能系统的组成及系统集成,介绍了光储电站的运行模式及控制策略,并结合实际运行结果进行验证。理论和实践表明,光储联合发电模式具有可行性,符合新能源并网的要求,是解决大规模集中式光伏发电送出和消纳难题的重要途径之一,对新能源大规模并网具有一定的示范作用。

储能电站电池标准与测试探讨

大规模储能系统已经成为保证电力系统可靠供电的一个重要手段,储能电池是储能系统的核心技术。梳理了现有储能电池相关标准,归纳了储能电站电池电气性能测试项目,并对实际测试中存在的问题进行剖析,以电池充放电试验温度和单体一致性为例,说明了储能电池电气性能测试方法仍有待进一步的标准化。为锂离子储能电池电气性能测试标准提供参考。

高效供电系统可靠性与安全性分析

高效供电系统主要用于满足严苛环境下的工作特性和稳定性要求,但由于锂离子电池内部是非稳态的电化学体系,因热滥用、电滥用和机械滥用等异常情况发生可能会产生安全隐患,从而造成严重经济损失和恶劣社会影响。文章提出一种分析验证该系统可靠性与安全性的方法,通过建模分析、热设计仿真验证其可靠性;且经热设计仿真分析满足在高温下长循环情况下的温度稳定性,但水冷板仍有优化空间;采用硬件分析法,分析该系统锂离子电池储能模块在使用过程中可能或实际发生的故障模式,为提高系统使用可靠性、运行安全性等提供依据。

探析锂离子电池电力储能系统的消防安全管理——以东莞为例

本文概述了当前电力储能的不同形式及其占比,分析了民用前景最广泛,且在电化学储能形式中占比最大的锂离子电池电力储能系统的安全性。概述了东莞市锂离子电池电力储能系统建设情况,并基于安全系统工程学[1],对锂离子电池电力储能系统开展预先危险性分析,为日常监督检查制作了消防安全检查表,供消防监督员和企业单位消防安全管理人进行日常检查评估,最后结合当前该类系统存在的风险点提出了完善标准、常态检查和强化救援的建议。

一种多时间尺度下的锂离子电池剩余寿命混合预测方法

针对锂离子电池储能系统寿命预测不准确问题,提出了一种多时间尺度下的电池剩余寿命混合预测方法。首先,通过带自适应噪声的完全集成经验模态分解(CEEMDAN),将原始数据分解为多个低频和高频分量。接着,利用GS-LM模型对其低频分量进行拟合预测,再将分解后的高频分量作为LSM-STW模型(滑动时间窗口和长短期记忆神经网络)的输入,得到高频分量预测结果。最后,将所有预测结果相加,得到最终的锂离子电池剩余寿命预测。实验结果表明,所提出的预测方法可以准确地预测锂离子电池容量退化趋势,不同预测起点对预测结果影响较小,并能够捕捉电池容量的再生现象。

解决中国能源短缺问题的重要途径

中国巨大的能源需求不能期望由化石能源来解决,而只能寄希望于可再生能源。期望中国将能由西南地区的水电、东南沿海地区风电和东北西北地区的风电分别实现各个不同地区发展所需电力,在储能方式中最值得重视的是锂离子蓄电池储能。福建省更有建立大型风电场的特殊条件,建议海峡两岸共同发展海上大型风电产业。

Electrochemical lithium storage performance of three-dimensional foam-like biocarbon/MoS2 composites

Molybdenum disulfide(MoS2)was loaded on biocarbon using waste camellia dregs(CDs)as the carbon source,which was further coated with dopamine hydrochloride to construct biocarbon/MoS2 electrode composites.The electrochemical lithium storage performance of the composites with different MoS2 contents was investigated.SEM results demonstrated that the composite had a three-dimensional foam-like structure with MoS2 as the interlayer.XRD and HRTEM tests revealed that MoS2 interlayer spacing in the composite was expanded.XPS analysis showed that new Mo—N bonds were formed in the active material.The electrochemical tests showed that the composite with a MoS2 content of 63%had a high initial specific capacity of 1434 mA·h/g at a current density of 100 mA/g.After a long cycle at a high current,it also showed good cycling stability and the capacity retention was nearly 100%.In addition,it had good lithium ion deintercalation ability in the electrochemical kinetics test.

Washing effect on properties of Li Ni_(0.8)Co_(0.15)Al_(0.05)O_2 cathode material by ethanol solvent

Different LiNi0.8Co0.15Al0.05O2 cathode materials were washed by ethanol solvent. Inductively coupled plasma atomic emission spectroscopy（ICP-AES）, Fourier transformed infrared（FTIR） spectrum, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, charge-discharge test and electrochemical impedance spectroscopy（EIS） were used to evaluate the elemental contents, structures, morphologies and electrochemical properties of samples. The results show that ethanol washing can remove effectively the synthetic residues LiOH/Li2 O on the freshly-prepared LiNi0.8Co0.15Al0.05O2 and make the sample much more resistant to H2O and CO2, without destroying its bulk structure, surface morphology and electrochemical performances. Moreover, the discharge specific capacity and cycle performance of LiNi0.8Co0.15Al0.05O2 after storage in air with a relative humidity of 80% for three months are improved by immediate ethanol washing.

Iron oxide encapsulated in nitrogen-rich carbon enabling high-performance lithium-ion capacitor

Lithium-ion capacitors(LICs)could combine the virtues of high power capability of conventional supercapacitors and high energy density of lithium-ion batteries.However,the lack of high-performance electrode materials and the kinetic imbalance between the positive and negative electrodes are the major challenge.In this study,Fe3O4 nanoparticles encapsulated in nitrogen-rich carbon(Fe3O4@NC)were prepared through a self-assembly of the colloidal Fe OOH with polyaniline(PANI)followed by pyrolysis.Due to the well-designed nanostructure,conductive nitrogen-rich carbon shells,abundant micropores and high specific surface area,Fe3O4@NC-700 delivers a high capacity,high rate capability and long cycling stability.Kinetic analyses of the redox reactions reveal the pseudocapacitive mechanism and the feasibility as negative material in LIC devices.A novel LIC was constructed with Fe3O4@NC-700 as the negative electrode and expanded graphene(EGN)as the positive electrode.The wellmatched two electrodes effectively alleviate the kinetic imbalance between the positive and negative electrodes.As a result,Fe3O4@NC-700//EGN LIC exhibits a wide operating voltage window,and thus achieves an ultrahigh energy density of 137.5 W h kg^-1.These results provide fundamental insights into the design of pseudocapacitive electrode and show future research directions towards the next generation energy storage devices.

Advances in flexible lithium metal batteries

Flexible energy storage devices are becoming indispensable new elements of wearable electronics to improve our living qualities.As the main energy storage devices,lithium-ion batteries(LIBs)are gradually approaching their theoretical limit in terms of energy density.In recent years,lithium metal batteries(LMBs)with metallic Li as the anode are revived due to the extremely high energy density,and are considered to be one of the ideal alternatives for the next generation of flexible power supply.In this review,key technologies and scientific problems to be overcome for flexible LMBs are discussed.Then,the recent advances in flexible LMBs,including the design of flexible Li metal anodes,electrolytes,cathodes and interlayers,are summarized.In addition,we have summed up the research progress of flexible device configurations,and emphasized the importance of flexibility evaluation and functionality integration to ensure the wearing safety in complex environment.Finally,the challenges and future development of flexible LMBs are summarized and prospected.

Enhancing sodium-ion storage performance of MoO/N-doped carbon through interfacial Mo–N–C bond

Na-ion batteries(SIBs)have attracted considerable attention as promising alternatives to commercial Li-ion batteries(LIBs)due to comparable redox potential,and natural abundance of Na.However,it remains challenging to explore suitable anodes for SIBs.Herein,a MoO2/N-doped carbon(MoO2/N-C)composite composed of MoO2 nanocrystals embedded within carbon matrix with a Mo–N–C chemical bond is prepared by a simple yet effective carbonization-induced topochemical transformation route.Na-ion half-cells using MoO2/N-C exhibit excellent cycling stability over 5000 cycles at 5 A g^-1 and superior rate capability.Physicochemical characterizations and first-principles density functional theory(DFT)simulations reveal that the formation of chemical bond at the interface between MoO2 and N-doped carbon plays an important role in the excellent charge storage properties of MoO2/N-C.More importantly,the interfacial coupling can efficiently promote interface charge transfer.Benefiting from this,Na-ion capacitors(SICs)constructed with the MoO2/N-C anode and activated carbon cathode can deliver an impressive energy density of 15 W h kg^-1 at a power density of 1760 W kg^-1,together with a capacitance retention of 92.4%over 1000 cycles at 10 A g^-1.The proposed strategy in this paper based on interfacial chemical bond may hold promises for the design of high-performance electrodes for energy storage devices.

Recent advancements in metal organic framework based electrodes for supercapacitors

Metal organic frameworks（MOFs） are considered as very promising candidates to build electrodes for electrochemical energy storage devices such as lithium ion batteries, fuel cells and supercapacitors, due to their diverse structure, adjustable aperture, large specific surface area and abundant active sites. Supercapacitor has been widely investigated in the past decades. Of critical importance in these devices is the electrode active materials, and this application has been intensively studied with the development of novel nanomaterials. In this review we summarize recent reports on MO Fs as electrode materials for super capacitors. Specifically,the synthesis of MOF materials for super capacitor electrodes and their performance in electrochemical energy storage are discussed. We aim to include supercapacitor electrode materials related to MOFs, such as carbon, metal and composite materials. It is proposed that MOFs play an important role in the development of a new generation of supercapacitor electrode materials. Finally, we discuss the current challenges in the field of supercapacitors, with a view towards how to address these challenges with the future development of MOFs and their derivatives.