共查询到20条相似文献，搜索用时 15 毫秒
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由于缺乏电力行业适用的锂离子电池安全管控方案,阻碍锂电池直流电源系统的推广应用。文章提出了一种基于远程巡视的锂电池直流电源系统安全管控方案,通过直流电源系统中电池模块内安全管控单元多重化、数据监测多维化和防护措施多级化,在锂电池的热失控危险性逐级上升前施加相应的安全防护措施;通过远程巡视对安全防护监测数据的校准状态偏离、随机误差波动性和系统误差稳定性进行持续监视,连续在线评估监测数据的失准风险,指导预防性检修介入,及时开展监测数据纠偏。热失控危险性试验证实了电池模块能阻止热失控后的可燃气体燃爆和热失控向电池模块外部扩散,监测数据准确性评估模拟试验证实了算法输出的长时段预警和短期告警能提前预判监测数据失准,试验结果表明本方案能有效实现锂电池直流电源系统的安全管控。
相似文献3.
良好的热管理系统是电池安全及高效使用的保证,电池的热管理需要确保电池温度在安全温度范围以及电池组内最大温差不超过5 ℃.传统的热管理方式,如空气冷却,不仅需要额外的动力输入,而且越来越不能满足高能量密度的新型锂离子电池的热管理需要.使用相变材料的电池热管理系统,利用相变材料的相变潜热吸收电池产生的热量,在不使用外界功耗的条件下,可以长时间保持电池的温度在适宜的范围内.通过与膨胀石墨,金属泡沫复合,相变材料的热导率可以大大提高,电池组内体系温度均匀性可以满足工作要求.而且,相变材料的形状不固定,可以使用在任意形状的电池上.被动式热管理是应用于电池热管理系统中最具前景的技术. 相似文献
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风冷系统因结构简单、成本低等特点,在热管理系统中占据重要地位。目前常规的风冷热管理设计方法存在重复性工作多、设计时间长的缺点。本文提出空气流动风阻网格模型结合热力学模型仿真的设计方法,先采用空气流动风阻网格模型获得优化的电池结构,再采用热力学模型进行仿真求解,获得优化的电池模组的流场和温度场分布特性。仿真结果验证了优化结构的准确性。优化结果表明,“C”字形结构更有利于提升模组内单体电池冷却效果的一致性,并且优化后的“C”字形结构进一步提升了电池模组内单体电池温度场的一致性。此外,计算结果发现模组内空气流动方向为上进下出时可进一步降低模组内单体电池的最高温度,提升单体电池温度场的一致性。 相似文献
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锂离子电池组的热管理对电动汽车的性能和安全性具有重要意义。基于多通道蛇形波纹管液冷式热管理系统,以200个18650型锂离子电池组为热管理对象,对电池在各种充放电倍率下所需的冷却液流量、泵功消耗以及热管理收益进行了实验研究。结果表明,热管理系统对动力电池在各种充放电应用条件下都具有较好的热管理效果,电池最大温度和最大温差基本可控制在40℃以下和5℃以内。提高冷却水流速对系统热管理能力的提升具有一定的效果,但是随着流速增大,热管理能力提升的边际效益也更趋明显;而系统运行所消耗的泵功增加导致了热管理收益随冷却水流速增加而大幅降低。从电池的性能安全以及热管理有效性的角度综合考虑,各充放电倍率下热管理系统的冷却水流速都是以保证电池安全和性能指标的最低流速为优。 相似文献
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Abhinav Sharma Yashodhan Patil Ravi Krishnaiah PhD B. Ashok PhD Akhil Garg PhD Liang Gao PhD 《亚洲传热研究》2020,49(8):4626-4656
Lithium-ion cells are preferred in the electrical powertrain due to high-power density, compactness, and modularity. In real driving conditions, the cells undergo discharge rates as high as 4 C resulting in high heat generation affecting the performance. To obtain the maximum performance the pack construction and thermal management of cells are crucial parameters. In our work, air-cooled technique with diverse air inlet and staggered scheme with a two-channel partition approach for thermal management of the cylindrical lithium-ion cells are studied in computational fluid dynamics. The simulation model is validated with experimental results. The obtained results demonstrate that the cells in the dual-directional air inlet arrangement had low maximum temperature difference among and within the cells and required least fan work. This arrangement required least fan work to generate optimal air inlet velocity of 2 m/s for 1, 2, and 3 C and 4 m/s for 4 C discharge rates. There is a reduction of 50% and 33% fan work for 3 and 4 C discharge rates, which are the majority operating points. Also, it shows that the temperature uniformity within the cells has improved. The results of this study can used to optimize parameters for designing an enhanced thermal management system. 相似文献
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Online state of health (SOH) prediction of lithium-ion batteries remains a very important problem in assessing the safety and reliability of battery-powered systems. Deep learning techniques based on recurrent neural networks with memory, such as the long short-term memory (LSTM) and gated recurrent unit (GRU), have very promising advantages, when compared to other SOH estimation algorithms. This work addresses the battery SOH prediction based on GRU. A complete BMS is presented along with the internal structure and configuration parameters. The neural network was highly optimized by adaptive moment estimation (Adam) algorithm. Experimental data show very good estimation results for different temperature values, not only at room value. Comparisons performed against other relevant estimation methods highlight the performance of the recursive neural network algorithms such as GRU and LSTM, with the exception of the battery regeneration points. Compared to LSTM, the GRU algorithm gives slightly higher estimation errors, but within similar prediction error range, while needing significantly fewer parameters (about 25% fewer), thus making it a very suitable candidate for embedded implementations. 相似文献
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Investigation on the thermal behavior of the lithium-ion battery which includes the temperature response, heat contribution and generation, is of vital importance for their performance and safety. In this study, an electrochemical-thermal cycling model is presented for a 4 Ah 21700 type cylindrical single cell and 3× 3 battery pack and the model is validated by experiment on a single cell. Thermal behavior on a single cell is first analyzed, the results show that the heat generated in the charge is smaller than the discharge, and the polarization heat contributes the most to total heat, especially under higher rate. It can also be concluded from the battery pack that the temperature of the cell inside the battery pack is significantly greater than the external battery, while the temperature difference exists the opposite regular due to the worst heat dissipation of the central cell. Finally, after taking the enhanced liquid cooling strategy, the maximum temperature is 320.6 K that is reduced by 9.38%, and the maximum temperature difference is 4.9 K which is reduced by 69.6% at 2C, meeting the requirements of battery thermal management system. 相似文献
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大容量锂离子电池储能系统对完善传统电网和高效利用新能源都具有非常重要的作用。为了实现大容量锂离子电池储能系统的高倍率化、长寿命化以及高安全性,高性能电池热管理系统的研发刻不容缓。本文总结了温度对锂离子电池性能的影响规律,综述了空冷、液冷、热管冷却、相变冷却这4种典型热管理技术的研究概况,分析了热管理技术在锂离子电池储能系统中的应用与研究状况。随着锂离子电池储能系统工作倍率的提高,产热量随之增大,对热管理系统的要求也越来越高。下一步的研究工作应围绕空冷系统优化、基于新型冷却介质的液冷系统、经济型热管及多目标优化设计这4方面展开。 相似文献
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电池热管理系统的优化设计可以维持动力电池的高效性能,进而促进电动汽车产业的发展。本文采用CFD方法研究有通风孔的情况下,风冷式锂离子电池组在放电过程中的散热性能。研究结果发现,在电池组外壳增设通风孔可以明显提高整个电池组的冷却效果。风孔开设在主出风口的相反方向时,电池组的温升和温差最小。当风孔的面积与出口面积相等时,电池组的冷却效果最佳;继续增大风孔对电池组的冷却效果影响较小。最后探讨了空气进口温度和电池间冷却通道的变化对电池组散热效果的影响。采用在电池组外壳上开设多个通风孔的办法有助于电池热管理系统的冷却优化设计。 相似文献
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电池健康状态（state of health,SOH）是保证系统安全稳定运行的关键,健康状态估计不准将影响电池的使用性能,甚至引发电池滥用等问题。电池电化学阻抗谱通过宽频范围内电池的阻抗特征来反映其内部的电化学过程,蕴含了大量电池老化信息,已经逐渐成为分析锂离子电池性能的有力工具。然而,传统的电池阻抗谱测试方法耗时长、成本高昂。为此,以实现锂离子电池的精细化检测与健康状态快速评估为目标,围绕基于电化学阻抗谱重构技术的电池健康状态估计方法展开研究。通过逆重复最大长度序列设计多频电流激励信号,实现了电池阻抗谱的快速测试。采用连续小波变换开展阻抗谱重构,从而获取目标频率范围内的电池阻抗信息,整个过程耗时小于4.5 min。通过不同老化状态电池在特殊频率点下的重构阻抗幅值建立经验模型,实现了电池健康状态的快速准确评估。 相似文献
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电池模块的温度采集准确性是影响电池管理系统（BMS）控制策略,关系到动力电池安全和寿命的重要因素。为准确采集锂离子电池在实车应用过程中的温度,设计一个2P8S电池模块,选取模块的两个电芯,在其不同部位及其对应的高压铝排上布置温度传感器。通过搭建实验平台,将电池模块分别放置于25 ℃和0 ℃的环境温度,对电池模块运行整车常用工况电流,研究各温度采集点的温升表现和规律。结果表明,对于方壳电芯和圆柱电芯,温度传感器布置在高压铝排上是相对最优解。对于软包电芯,温度传感器布置在电芯本体表面更为合适。 相似文献
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Hao Ji Wei Zhang Xu-Hai Pan Min Hua Yi-Hong Chung Chi-Min Shu Li-Jing Zhang 《国际能源研究杂志》2020,44(8):6502-6510
The state of health (SOH) is a crucial indicator of lithium-ion batteries. A battery cycle and calendar life are critical for electric vehicle batteries. Complex interactions occur between the SOH and internal resistance of a battery. In this study, several ternary lithium-ion battery charge discharge experiments were performed to investigate the effects of the ambient temperature, discharge rate, and depth of discharge on a battery's internal resistance. An SOH prediction model was then constructed and used to evaluate the remaining capacity of the electric vehicle battery. The model was verified through various experiments, and a comparison of experimental and model-derived data revealed a favorable agreement. Thus, the model accurately predicted the SOH of a ternary lithium-ion battery. 相似文献
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近年来,锂离子电池在储能电站调频领域得到了飞速发展。为满足调频电站的电压和功率要求,需将大量电池单体进行串联,如此产生的电池组串联不一致性问题,以及调频过程中高倍率和频繁切换充放电状态对不一致性程度的加剧,严重影响电池组的使用寿命和安全性能。针对上述问题,本文基于调频储能串联锂离子电池模组不一致性问题的形成原因,归纳分析用于改善电池组串联不一致性问题的均衡技术和均衡策略。其中,均衡拓扑结构按能量流向角度进行分类梳理,均衡控制策略则基于均衡的不同目标进行优劣分析。在此基础上对锂离子调频电池模组均衡技术的发展趋势进行展望。 相似文献
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Wireless sensor nodes (WSNs) are expected to play an increasing role in multiple application areas. These application areas vary from networks around the human body, sensors in smart tires, sensor networks that can control the safety and comfort levels throughout smart buildings, sensors that monitor the necessity for maintenance and sensors that track the conditions of food throughout the distribution chain. These wireless sensors need energy, which can be supplied by a battery or an energy harvester. However, even when an energy harvester is applied, energy storage is required to serve as energy buffer. In this review, the requirements that different types of wireless sensor networks impose on these batteries are explored, and several suitable types of batteries are reviewed. Moreover, the trends in battery development are described, and the future improvements are predicted. Finally, the possibilities are discussed to select a battery with properties that are matched to the requirements of the sensor nodes. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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锂离子电池核容维护需要现场人工操作,加剧了人力紧张,阻碍了锂离子电池替换直流电源系统中铅酸电池的应用。文章提出了一种基于间歇充电运行方式的锂离子电池直流电源系统及其远程运维方案,通过采用间歇充电方式,实现了充放电循环使用的锂离子电池长期满容量备电,核容放电期间的蓄电池在线备电,充电期间的蓄电池在线热失控阻断;通过远程发令启动、远程持续监视和对本地告警和运行异常的远程应急处置,实现了蓄电池核容维护的全过程、全状态自动运行,并在运行失常后将锂离子电池维持在低风险稳定状态。通过在2座110 kV变电站示范运行,充放电在内的全过程耗时不超过5 h,磷酸铁锂电池表面温度不超过50 ℃,解决了锂离子电池直流电源系统推广面临的技术问题。
相似文献19.
A desirable operating temperature range and small temperature gradient is beneficial to the safety and longevity of lithium-ion (Li-ion) batteries, and battery thermal management systems (BTMSs) play a critical role in achieving the temperature control. Having the advantages of direct access and low viscosity, air is widely used as a cooling medium in BTMSs. In this paper, an air-based BTMS is modified by integrating a direct evaporative cooling (DEC) system, which helps reduce the inlet air temperature for enhanced heat dissipation. Experiments are carried out on 18650-type batteries and a 9-cell battery pack to study how relative humidity and air flow rate affect the DEC system. The maximum temperatures, temperature differences, and capacity fading of batteries are compared between three cooling conditions, which include the proposed DEC, air cooling, and natural convection cooling. In addition, a DEC tunnel that can produce reciprocating air flow is assembled to further reduce the maximum temperature and temperature difference inside the battery pack. It is demonstrated that the proposed DEC system can expand the usage of Li-ion batteries in more adverse and intensive operating conditions. 相似文献
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随着电化学储能市场的蓬勃发展,电化学储能电池本身的安全性越来越受到关注,如何最大程度地降低储能电池组火灾风险是电化学储能大规模应用时亟需解决的问题。本文综述目前国内外针对锂离子电池热失控已有的研究成果,包括磷酸铁锂电池的燃烧特性、火灾危险等级以及在储能电站预警系统中应用的锂离子电池热失控及热扩散参数;梳理不同灭火剂对电池火灾的灭火效率;同时总结电化学储能电站的灭火系统选择,为电网储能工程应用提供参考,有效支持锂离子储能电池的大规模工程需求。 相似文献