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High-areal-capacity all-solid-state Li-S battery enabled by dry process technology 采用干法工艺的高面积容量全固态锂电池
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-11-30 DOI: 10.1016/j.etran.2023.100298
Zhongwei Lv , Jun Liu , Cheng Li , Jingxue Peng , Chenxi Zheng , Xuefan Zheng , Yuqi Wu , Meng Xia , Haoyue Zhong , Zhengliang Gong , Yong Yang

All-solid-state lithium-sulfur batteries (ASSLSBs) based on sulfide solid electrolyte (SSE) hold great promise as the next-generation energy storage technology with great potential for high energy density and improved safety. However, the development of practical ASSLSBs is restricted by the scalable fabrication of sulfur cathode sheets with outstanding electrochemical performance, which remains a complex and challenging endeavor. Herein, we employ dry electrode technology to fabricate free-standing sulfur cathode sheets with both high sulfur content and loading. By utilizing polytetrafluoroethylene (PTFE) binders with unique fibrous morphologies in the dry electrodes, we achieved sulfur cathode sheets with high flexibility without compromising ionic and electronic conductivity. Remarkably, even with thickened dry cathode sheets featuring high sulfur loading of 4.5 mg cm-2, the sulfur cathodes exhibit high initial discharge capacity of 1114.8 mAh g-1 with good cycle stability and rate capability. Additionally, we successfully demonstrate the construction of sheet-type all-solid-state Li3.75Si/SSE/S cells, showcasing favorable electrochemical performance with a high reversible capacity of 1067.4 mAh g-1 after 30 cycles even at a high sulfur loading of 4.5 mg cm-2 and high current density of 1 mA cm-2 (0.2C). Our findings represent a demonstration of batteries coupled with high-capacity sulfur cathode and lithiated silicon anode exhibiting exceptional electrochemical performance. It also underscores the significant potential of dry-process technology in addressing the critical challenges associated with the practical production of ASSLSBs. This contribution propels ongoing endeavors in the development of next-generation energy storage systems.

基于硫化物固体电解质(SSE)的全固态锂硫电池(ASSLSBs)作为下一代储能技术,具有高能量密度和提高安全性的巨大潜力。然而,实际ASSLSBs的发展受到具有优异电化学性能的硫阴极片的可扩展制造的限制,这仍然是一项复杂而具有挑战性的工作。在此,我们采用干电极技术制造了具有高硫含量和负载的独立式硫阴极片。通过在干电极中使用具有独特纤维形态的聚四氟乙烯(PTFE)粘合剂,我们获得了具有高柔韧性且不影响离子和电子导电性的硫阴极片。值得注意的是,即使加厚的干阴极片具有4.5 mg cm-2的高硫负载,硫阴极也具有1114.8 mAh g-1的高初始放电容量,具有良好的循环稳定性和倍率能力。此外,我们成功地展示了片状全固态Li3.75Si/SSE/S电池的结构,即使在4.5 mg cm-2的高硫负荷和1 mA cm-2 (0.2C)的高电流密度下,30次循环后也具有1067.4 mAh g-1的高可逆容量。我们的发现代表了高容量硫阴极和锂化硅阳极耦合的电池表现出优异的电化学性能。它还强调了干法技术在解决与ASSLSBs实际生产相关的关键挑战方面的巨大潜力。这一贡献推动了下一代储能系统开发的持续努力。
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引用次数: 0
Lithium ion batteries participating in frequency regulation for power grid under the thermoelectric coupling degradation mechanisms 热电耦合退化机制下参与电网频率调节的锂离子电池
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-07 DOI: 10.1016/j.etran.2023.100290
Yudi Qin , Xiaoru Chen , Zhoucheng Xu , Jiuyu Du , Hewu Wang , Qiang Zhang , Minggao Ouyang

Lithium-ion batteries (LIBs) play an important role for the global net-zero emission trend. They are suitable for the power interaction with the power grid with high penetration renewable energy. However, the detail evolution of the LIBs participating in frequency regulation (FR) service at low temperature is critical for the all-climate application, especially the capacity decay and the related economic loss. This study reveals that the primary degradation mechanisms for FR operation at low temperature include lithium plating of anode and lattice distortion of cathode. Surprisingly, FR with appropriate parameters for batteries at low temperature does not introduce additional capacity decay due to the great temperature rise brought about and the optimized interfacial mass transfer. This study then analyses the economy of electric vehicles (EVs) participating in FR service, which is called vehicle-to-grid (V2G). A better temperature control can improve the profit of 35.88 $/kW. An appropriate capability is also vital to improve the profit of FR service. Moreover, suitable FR conditions for LIBs can even bring a certain degree of capacity improvement at low temperature. This work guides the design criteria of non-destructive LIB interaction for future grid.

锂离子电池(LIB)在全球净零排放趋势中发挥着重要作用。它们适用于与可再生能源渗透率高的电网进行电力互动。然而,参与频率调节(FR)服务的锂离子电池在低温条件下的详细演化对全天候应用至关重要,尤其是容量衰减和相关的经济损失。本研究揭示了低温下频率调节工作的主要衰减机制,包括阳极镀锂和阴极晶格畸变。令人惊讶的是,在低温条件下,采用适当参数的 FR 电池不会产生额外的容量衰减,这是因为温度升高幅度很大,而且优化了界面传质。随后,本研究分析了电动汽车(EV)参与 "车联网"(V2G)服务的经济性。更好的温度控制可提高 35.88 美元/千瓦的利润。适当的能力对于提高 FR 服务的利润也至关重要。此外,适合锂电池的温度控制条件甚至可以在低温条件下带来一定程度的容量提升。这项工作为未来电网的无损锂电池相互作用设计标准提供了指导。
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引用次数: 0
Impact of scaling laws of permanent magnet synchronous machines on the accuracy of energy consumption computation of electric vehicles 永磁同步电机标度规律对电动汽车能耗计算精度的影响
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100269
Ayoub Aroua , Walter Lhomme , Florian Verbelen , Mohamed N. Ibrahim , Alain Bouscayrol , Peter Sergeant , Kurt Stockman

This paper compares the impact of two scaling methods of electric machines on the energy consumption of electric vehicles. The first one is the linear losses-to-power scaling method of efficiency maps, which is widely used in powertrain design studies. While the second is the geometric scaling method. Linear scaling assumes that the losses of a reference machine are linearly scaled according to the new desired power rating. This assumption is questionable and yet its impact on the energy consumption of electric vehicles remains unknown. Geometric scaling enables rapid and accurate recalculation of the parameters of the scaled machines based on scaling laws validated by finite element analysis. For this comparison, a reference machine design of 80 kW is downscaled with a power scaling factor of 0.58 and upscaled considering a power scaling of 1.96. For comparative purposes, optimal combinations of geometric scaling factors are determined. The scaled machines are derived to fit the driving requirements of two electric vehicles, namely a light-duty vehicle and a medium-duty truck. The comparison is performed for 9 standardized driving cycles. The results show that the maximal relative difference between linear and geometric scaling in terms of energy consumption is 3.5% for the case of the light-duty vehicle, compared with 1.2% for the case of the truck. The findings of this work provide evidence that linear scaling can continue to be used in system-level design studies with a relatively low impact on energy consumption. This is of high interest considering the simplicity of linear scaling and its potential for time-saving in the early development phases of electric vehicles.

本文比较了两种电机定标方法对电动汽车能耗的影响。第一种是效率图的线性损失功率比例法,该方法广泛应用于动力总成设计研究。第二种是几何缩放法。线性缩放假设参考机器的损耗根据新的期望功率额定值线性缩放。这一假设值得商榷,但其对电动汽车能耗的影响仍不得而知。几何缩放可以根据经有限元分析验证的缩放规律快速准确地重新计算缩放后的机器参数。为了进行比较,参考机器设计为80 kW,按功率缩放系数为0.58进行缩小,按功率缩放系数为1.96进行放大。为了便于比较,确定了几何比例因子的最佳组合。根据两种电动汽车,即轻型汽车和中型卡车的行驶要求,推导出了缩放后的机器。在9个标准化驾驶循环中进行了比较。结果表明,在能源消耗方面,轻型汽车的线性和几何尺度之间的最大相对差异为3.5%,而卡车的相对差异为1.2%。这项工作的发现提供了证据,线性缩放可以继续在系统级设计研究中使用,对能耗的影响相对较低。考虑到线性缩放的简单性及其在电动汽车早期开发阶段节省时间的潜力,这是非常有趣的。
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引用次数: 2
High-precision and efficiency diagnosis for polymer electrolyte membrane fuel cell based on physical mechanism and deep learning 基于物理机理和深度学习的聚合物电解质膜燃料电池高精度高效诊断
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100275
Zhichao Gong , Bowen Wang , Yanqiu Xing , Yifan Xu , Zhengguo Qin , Yongqian Chen , Fan Zhang , Fei Gao , Bin Li , Yan Yin , Qing Du , Kui Jiao

As a nonlinear and dynamic system, the polymer electrolyte membrane fuel cell (PEMFC) system requires a comprehensive failure prediction and health management system to ensure its safety and reliability. In this study, a data-driven PEMFC health diagnosis framework is proposed, coupling the fault embedding model, sensor pre-selection method and deep learning diagnosis model. Firstly, a physical-based mechanism fault embedding model of PEMFC is developed to collect the data on various health states. This model can be utilized to determine the effects of different faults on cell performance and assist in the pre-selection of sensors. Then, considering the effect of fault pattern on decline, a sensor pre-selection method based on the analytical model is proposed to filter the insensitive variable from the sensor set. The diagnosis accuracy and computational time could be improved 3.7% and 40% with the help of pre-selection approach, respectively. Finally, the data collected by the optimal sensor set is utilized to develop the fault diagnosis model based on 1D-convolutional neural network (CNN). The results show that the proposed health diagnosis framework has better diagnosis performance compared with other popular diagnosis models and is conducive to online diagnosis, with 99.2% accuracy, higher computational efficiency, faster convergence speed and smaller training error. It is demonstrated that faster convergence speed and smaller training error are reflected in the proposed health diagnosis framework, which can significantly reduce computational costs.

聚合物电解质膜燃料电池(PEMFC)系统作为一个非线性动态系统,需要一个全面的故障预测和健康管理系统来保证其安全性和可靠性。本研究提出了一种数据驱动的PEMFC健康诊断框架,将故障嵌入模型、传感器预选方法和深度学习诊断模型相结合。首先,建立了基于物理机制的PEMFC故障嵌入模型,用于采集各种健康状态数据;该模型可用于确定不同故障对电池性能的影响,并有助于传感器的预选。然后,考虑故障模式对衰落的影响,提出了一种基于解析模型的传感器预选方法,从传感器集中筛选出不敏感变量。预选方法的诊断准确率和计算时间分别提高3.7%和40%。最后,利用最优传感器集收集的数据建立基于一维卷积神经网络(CNN)的故障诊断模型。结果表明,与其他流行的诊断模型相比,所提出的健康诊断框架具有更好的诊断性能,有利于在线诊断,准确率达到99.2%,计算效率更高,收敛速度更快,训练误差更小。结果表明,该健康诊断框架具有更快的收敛速度和更小的训练误差,可以显著降低计算成本。
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引用次数: 0
A review on ammonia-hydrogen fueled internal combustion engines 氨氢燃料内燃机研究进展
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100288
Yunliang Qi , Wei Liu , Shang Liu , Wei Wang , Yue Peng , Zhi Wang

In the face of the electrification trend in transportation, the internal combustion engine (ICE) is expected to continue playing a vital role in generating electricity for power systems or directly propelling vehicles in certain sectors. However, ICEs are also under significant pressure to achieve carbon neutrality, with the key lying in carbon-free fuels. Ammonia, compared to hydrogen, offers advantages in terms of hydrogen-carrying capacity, storage and transportation convenience, and safety, making it a promising carbon-free fuel for large-scale use in ICEs. Nonetheless, ammonia's combustion inertness poses challenges for its application, requiring efforts to enhance its combustion. Hydrogen, as a carbon-free and highly reactive fuel, serves as a powerful combustion promoter, maximizing the carbon-free effect of ammonia. Furthermore, on-board ammonia decomposition can produce hydrogen, ensuring a stable hydrogen supply and enabling ammonia-hydrogen synergy combustion while carrying only ammonia. This ammonia-hydrogen synergy combustion, based on on-board hydrogen production, presents a highly promising development direction for ammonia engines. When combined with hybridization, it further enhances the overall energy efficiency of ammonia. The objective of this paper is to review recent advancements in ammonia-hydrogen engines, covering topics such as ignition methods and combustion strategies, fuel supply, pollutants, and after-treatment. Based on this review, a conceptual ammonia-hydrogen engine for hybrid power systems is proposed. This engine ignites the ammonia-hydrogen mixture in the main chamber using hydrogen active jet ignition, achieving spark-assisted compression ignition. Technical measures for efficient engine combustion, synergistic utilization of exhaust heat for hydrogen production, and effective after-treatment of NOx, unburned NH3, and N2O are discussed. At last, some perspectives on the development of ammonia-hydrogen engines are also presented.

面对交通运输的电气化趋势,内燃机(ICE)预计将继续在为电力系统发电或直接推动某些行业的车辆方面发挥重要作用。然而,ICEs在实现碳中和方面也面临巨大压力,关键在于无碳燃料。与氢相比,氨在载氢能力、储存和运输便利性以及安全性方面具有优势,是一种很有前途的无碳燃料,可在内燃机中大规模使用。尽管如此,氨的燃烧惰性对其应用提出了挑战,需要努力提高其燃烧性能。氢作为一种无碳、高活性的燃料,是一种强大的燃烧促进剂,最大限度地发挥氨的无碳效果。此外,车载氨分解可以产生氢气,确保稳定的氢气供应,并在仅携带氨的情况下实现氨氢协同燃烧。这种基于车载制氢的氨氢协同燃烧为氨发动机提供了一个非常有前景的发展方向。当与杂交结合时,它进一步提高了氨的整体能源效率。本文的目的是回顾氨氢发动机的最新进展,涵盖点火方法和燃烧策略、燃料供应、污染物和后处理等主题。在此基础上,提出了一种用于混合动力系统的概念性氨氢发动机。该发动机使用氢气主动喷射点火点燃主室内的氨氢混合物,实现火花辅助压缩点火。讨论了发动机高效燃烧、余热协同利用制氢以及NOx、未燃NH3和N2O有效后处理的技术措施。最后,对氨氢发动机的发展前景进行了展望。
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引用次数: 3
Challenges and opportunities of practical sulfide-based all-solid-state batteries 实用硫化物基全固态电池的挑战和机遇
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100272
Dongsheng Ren , Languang Lu , Rui Hua , Gaolong Zhu , Xiang Liu , Yuqiong Mao , Xinyu Rui , Shan Wang , Bosheng Zhao , Hao Cui , Min Yang , Haorui Shen , Chen-Zi Zhao , Li Wang , Xiangming He , Saiyue Liu , Yukun Hou , Tiening Tan , Pengbo Wang , Yoshiaki Nitta , Minggao Ouyang

All-solid-state batteries (ASSBs) are regarded as the most promising next-generation batteries for electric vehicles in virtue of their potential advantages of enhanced safety, high energy density and power capability. Among the ASSBs based on various solid electrolytes (SEs), sulfide-based ASSBs have attracted increasing attention due to the high ionic conductivity of sulfide SEs which is comparable to that of liquid electrolytes. Extensive efforts from academia and industry have been made to develop sulfide-based ASSBs, and several significant progress has been achieved in recent years. However, successful fabrication of high-performance sulfide-based ASSBs has been rarely reported, and the practical application of sulfide-based ASSBs still faces a variety of challenges. Herein, following a bottom-up approach, we present a comprehensive review of the critical issues of practical sulfide-based ASSBs from the material, interface, composite electrode to cell levels. The existing challenges, recent advances, and future research directions of sulfide-based ASSBs at multiple levels are discussed. Finally, several fabrication processes for scaling up sulfide-based ASSBs and existing pilot/mass production schedules of sulfide-based ASSBs of the leading companies are also introduced. Facing the existing challenges and future opportunities, we highly encourage joint efforts and cooperation across the battery community to promote the practical application of sulfide-based ASSBs.

全固态电池(assb)具有安全性强、能量密度高、动力能力强等潜在优势,被认为是最有前途的下一代电动汽车电池。在基于各种固体电解质(SEs)的assb中,硫化物基assb因其具有与液体电解质相当的高离子电导率而越来越受到人们的关注。近年来,学术界和工业界对硫化物基assb的开发进行了广泛的努力,并取得了一些重大进展。然而,成功制备高性能硫化物基assb的报道很少,硫化物基assb的实际应用仍面临各种挑战。在此,遵循自下而上的方法,我们从材料,界面,复合电极到电池水平全面回顾了实用硫化物基assb的关键问题。从多个层面讨论了硫化物基assb存在的挑战、最新进展和未来的研究方向。最后,还介绍了几种扩大硫化物基assb的制造工艺以及领先公司现有的硫化物基assb中试/量产计划。面对当前的挑战和未来的机遇,我们高度鼓励电池界共同努力与合作,推动硫化物基assb的实际应用。
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引用次数: 0
Improve multi-energy supply microgrid resilience using mobile hydrogen trucks based on transportation network 基于交通网络的移动氢能卡车提高多能源供应微电网弹性
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100265
Bei Li , Jiangchen Li , Bingcong Jian

Nowadays, multi-energy supply utility grid system has witnessed the destruction of increasing natural disasters. Under the disasters, the energy supply capability from the utility grid system to the end-user microgrids is decreased, which is due to the destruction of the system infrastructure. Thus, how to improve the resilience of the microgrids under disasters is an essential problem. In this paper, a mobile hydrogen truck-assisted methodology is proposed to deliver hydrogen tanks to end-user microgrids via transportation network to resist to the natural disasters. First, a temporal–spatial destructive model of the natural disasters based on the grid division is presented, and the dynamical energy supply ability of an IEEE30+gas20+heat14 utility grid system is derived. Second, a hydrogen tank delivering model from hydrogen company to microgrids based on transportation network is presented. Third, a real-world transportation network based on SUMO simulator is linked with Matlab to simulate the real-time coupling between transportation network and power network. Last, microgrids optimal operation based on the temporal–spatial destructive model and hydrogen tank delivering model is presented. The simulation results show that with the assistance of the arrived hydrogen tanks through real-world transportation network in microgrid, one can indeed reduce load shedding. However, when considering the damaged transportation network, the saving loads are reduced due to the increase of the mobile hydrogen storage delivery time. It reveals that delivering mobile hydrogen tanks to end-user microgrids can effectively improve the system resilience.

目前,多能源供电公用电网系统受到越来越多的自然灾害的破坏。在灾害条件下,由于系统基础设施的破坏,电网系统向终端用户微电网的供能能力下降。因此,如何提高微电网在灾害条件下的恢复能力是一个至关重要的问题。本文提出了一种移动氢车辅助的方法,通过运输网络将氢罐运送到终端用户微电网,以抵御自然灾害。首先,建立了基于网格划分的自然灾害时空破坏模型,推导了IEEE30+gas20+heat14公用电网系统的动态供能能力。其次,提出了基于交通网络的氢能公司向微电网输送氢罐的模型。第三,将基于SUMO模拟器的现实交通网络与Matlab相结合,模拟交通网络与电网的实时耦合。最后,提出了基于时空破坏模型和氢罐输送模型的微电网优化运行。仿真结果表明,在微电网实际运输网络中到达的氢罐的辅助下,确实可以减少减载。然而,考虑到运输网络的损坏,由于移动储氢交付时间的增加,节省的负荷会减少。研究表明,向终端用户微电网提供移动氢罐可以有效提高系统的弹性。
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引用次数: 0
Interpretable deep learning for accelerated fading recognition of lithium-ion batteries 加速锂离子电池衰落识别的可解释深度学习
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100281
Chang Wang , Ying Chen , Weiling Luan , Songyang Li , Yiming Yao , Haofeng Chen

Data-driven approaches have gained increasing attention in the field of battery life-related prediction, as building a comprehensive mechanistic degradation model remains a challenge. Deep learning has emerged as a powerful data-driven fitting method for battery-related applications. However, interpretability remains an issue in this field, hindering the practical utilization of deep learning methods. With the development of interpretable techniques, deep learning methods not only can be conducted as black box tools for fitting, but also for exploring the relationship between external battery data and internal electrochemical changes. In this paper, an interpretable deep learning procedure is proposed and exemplified by accelerated fading point (knee-point) recognition based on an open battery dataset. The Gradient-weighted Class Activation Mapping (Grad-CAM) is conducted to explain the link between the input and output of the trained convolutional neural networks (CNN) model. The trained CNN model possesses deep insight into battery degradation, giving the very first warning when accelerated fading occurs. Through interpretability analysis, it is confirmed that the well-trained model can spontaneously focus on features associated with internal battery degradation and identify some additional features beyond existing human experience. The proposed method can be used to discover the relationship between battery data and degradation mechanism by artificial intelligence in the electric vehicles (EVs) field.

数据驱动的方法在电池寿命预测领域受到越来越多的关注,因为建立一个全面的机制退化模型仍然是一个挑战。深度学习已经成为电池相关应用中强大的数据驱动拟合方法。然而,可解释性仍然是该领域的一个问题,阻碍了深度学习方法的实际应用。随着可解释技术的发展,深度学习方法不仅可以作为黑匣子工具进行拟合,还可以用于探索电池外部数据与内部电化学变化之间的关系。本文提出了一种可解释的深度学习方法,并以基于开放电池数据集的加速衰落点(膝点)识别为例。采用梯度加权类激活映射(Gradient-weighted Class Activation Mapping, Grad-CAM)来解释训练后的卷积神经网络(CNN)模型的输入和输出之间的联系。训练后的CNN模型对电池退化具有深刻的洞察力,在加速衰落发生时给出第一个警告。通过可解释性分析,证实训练良好的模型可以自发地关注与电池内部退化相关的特征,并识别出一些超出现有人类经验的附加特征。该方法可用于电动汽车领域的人工智能电池数据与退化机制之间的关系。
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引用次数: 0
Nonlinear aging knee-point prediction for lithium-ion batteries faced with different application scenarios 不同应用场景下锂离子电池非线性老化膝点预测
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100270
Heze You , Jiangong Zhu , Xueyuan Wang , Bo Jiang , Xuezhe Wei , Haifeng Dai

The capacity degradation of lithium-ion batteries (LIBs) will accelerate after long-term cycling, showing nonlinear aging features, which not only shortens the long-term life of LIBs, but also seriously endangers their safety. In this paper, by introducing the concept of nonlinear aging degree, a knee-point identification method based on the maximum distance method is established, and the nonlinear aging behavior of LIBs is identified and marked, so as to know whether the nonlinear aging phenomenon has occurred. Furthermore, two knee-point prediction methods have been proposed and compared. The direct knee-point prediction method based on stacked long short-term memory (S-LSTM) neural network and sliding window method is proposed for the scenarios of battery development, early performance evaluation and online application. For scenarios such as echelon utilization and post-safety evaluation, an indirect knee-point prediction method combining capacity prediction and knee-point identification algorithm is proposed. Through multi-dimensional comparison of the two methods, the strengths and weaknesses of their applicable scenarios are analyzed. Our work has guiding significance for finding the ideal replacement opportunity of LIBs in different scenarios, so that the user can be reminded whether to maintain or replace the battery, which greatly reduces the risk of battery safety problems.

锂离子电池在长期循环后,其容量退化会加速,呈现出非线性老化特征,不仅缩短了锂离子电池的长期寿命,而且严重危及锂离子电池的安全。本文通过引入非线性老化程度的概念,建立了基于最大距离法的膝点识别方法,对lib的非线性老化行为进行识别和标记,从而判断是否发生了非线性老化现象。提出了两种膝点预测方法,并进行了比较。针对电池研发、早期性能评估和在线应用等场景,提出了基于堆叠长短期记忆(S-LSTM)神经网络和滑动窗口法的直接膝点预测方法。针对梯队利用和安全后评价等场景,提出了一种结合容量预测和膝点识别算法的间接膝点预测方法。通过对两种方法的多维度比较,分析了各自适用场景的优缺点。我们的工作对于寻找不同场景下锂电池的理想更换时机,从而提醒用户是否需要维护或更换电池,大大降低电池安全问题的风险,具有指导意义。
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引用次数: 2
Water management issues during load cycling under high temperature and low humidity conditions relevant for heavy-duty applications of PEMFC 高温和低湿条件下负载循环中的水管理问题与PEMFC的重载应用相关
IF 11.9 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2023-10-01 DOI: 10.1016/j.etran.2023.100285
Yangbin Shao, Liangfei Xu, Ling Xu, Xiyuan Zhang, Zhina Wang, Guanlei Zhao, Zunyan Hu, Jianqiu Li, Minggao Ouyang

To meet the increased requirements for efficiency and compactness of the Polymer Electrolyte Membrane Fuel Cell (PEMFC) system for heavy-duty vehicles (HDVs) application, PEMFC has to operate under high temperature and low humidity (HTLH) conditions to reduce the parasitic power consumption of radiators and the size of humidifier. However, HTLH would negatively affect the performance and durability of PEMFC. Through conducting in-situ current mapping, this paper found highly inhomogeneous current in-plane distribution during current cycling under HTLH conditions, which is attributed to the self-reinforced feedback of local current density and membrane water content. Instead, under the situations where current increase is prior to the temperature increase, PEMFC would have much more uniform in-plane current distribution and membrane water distribution, resulting in more efficient utilization of the produced water in a dry environment.

为了满足重型车辆(hdv)对聚合物电解质膜燃料电池(PEMFC)系统的效率和紧凑性的更高要求,PEMFC必须在高温低湿(HTLH)条件下运行,以减少散热器的寄生功耗和加湿器的尺寸。然而,HTLH会对PEMFC的性能和耐久性产生负面影响。通过原位电流测绘,本文发现HTLH条件下电流循环过程中电流面内分布高度不均匀,这是由于局部电流密度和膜含水量的自增强反馈所致。相反,在电流升高先于温度升高的情况下,PEMFC的面内电流分布和膜水分布将更加均匀,从而在干燥环境下更有效地利用采出水。
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引用次数: 1
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Etransportation
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