The state of health(SOH)is a critical factor in evaluating the performance of the lithium-ion batteries(LIBs).Due to various end-user behaviors,the LIBs exhibit different degradation modes,which makes it challenging t...The state of health(SOH)is a critical factor in evaluating the performance of the lithium-ion batteries(LIBs).Due to various end-user behaviors,the LIBs exhibit different degradation modes,which makes it challenging to estimate the SOHs in a personalized way.In this article,we present a novel particle swarm optimization-assisted deep domain adaptation(PSO-DDA)method to estimate the SOH of LIBs in a personalized manner,where a new domain adaptation strategy is put forward to reduce cross-domain distribution discrepancy.The standard PSO algorithm is exploited to automatically adjust the chosen hyperparameters of developed DDA-based method.The proposed PSODDA method is validated by extensive experiments on two LIB datasets with different battery chemistry materials,ambient temperatures and charge-discharge configurations.Experimental results indicate that the proposed PSO-DDA method surpasses the convolutional neural network-based method and the standard DDA-based method.The Py Torch implementation of the proposed PSO-DDA method is available at https://github.com/mxt0607/PSO-DDA.展开更多
健康状态(state of health,SOH)是电池管理系统的重要参考依据,准确的SOH估计对保证电池安全稳定运行具有重大意义,其中提取可靠有效的健康特征描述电池老化状态以及构建精确稳定的估计模型是目前面临的主要问题。为了提高SOH估计精度,...健康状态(state of health,SOH)是电池管理系统的重要参考依据,准确的SOH估计对保证电池安全稳定运行具有重大意义,其中提取可靠有效的健康特征描述电池老化状态以及构建精确稳定的估计模型是目前面临的主要问题。为了提高SOH估计精度,提出了一种基于模糊熵和粒子滤波(particle filter,PF)的锂离子电池SOH估计方法。首先,通过分析电池老化过程中的放电电压数据,提取模糊熵值作为电池的老化特征;其次,基于代谢灰色模型(metabolic grey model,MGM)和时间卷积网络(temporal convolutional network,TCN)构建描述锂电池老化特征的非参数状态空间模型;最后,通过PF实现锂电池SOH的闭环估计。此外,利用NASA锂电池数据集对所提出的SOH估计方法进行了验证,并与该领域其他方法进行对比实验。结果表明,所提方法最大估计误差在5%左右,相比于同类方法其估计精度提升了约50%,且在不同训练周期数条件下表现出较好的鲁棒性,验证了所提方法的可行性与优越性。展开更多
Lithium-ion batteries are the most widely accepted type of battery in the electric vehicle industry because of some of their positive inherent characteristics. However, the safety problems associated with inaccurate e...Lithium-ion batteries are the most widely accepted type of battery in the electric vehicle industry because of some of their positive inherent characteristics. However, the safety problems associated with inaccurate estimation and prediction of the state of health of these batteries have attracted wide attention due to the adverse negative effect on vehicle safety. In this paper, both machine and deep learning models were used to estimate the state of health of lithium-ion batteries. The paper introduces the definition of battery health status and its importance in the electric vehicle industry. Based on the data preprocessing and visualization analysis, three features related to actual battery capacity degradation are extracted from the data. Two learning models, SVR and LSTM were employed for the state of health estimation and their respective results are compared in this paper. The mean square error and coefficient of determination were the two metrics for the performance evaluation of the models. The experimental results indicate that both models have high estimation results. However, the metrics indicated that the SVR was the overall best model.展开更多
实时估计电动汽车动力电池健康状态(State of Health,SOH),对于充分保证每个电池组的充/放电性能,延长整个电池组的寿命具有重要意义。作为电池管理系统的重要组成部分,相比于电池荷电状态(State of Charge,SOC)和电池均衡系统的研究,SO...实时估计电动汽车动力电池健康状态(State of Health,SOH),对于充分保证每个电池组的充/放电性能,延长整个电池组的寿命具有重要意义。作为电池管理系统的重要组成部分,相比于电池荷电状态(State of Charge,SOC)和电池均衡系统的研究,SOH估计方法的研究明显落后。简单介绍了SOH的定义及影响因素,按照离线估计方法和在线估计方法进行分类,探讨了常见的SOH估计方法。最后展望了SOH估计方法的发展趋势,指出基于卡尔曼滤波的在线估计和智能学习神经网络的方法将是未来的主流方法。展开更多
对锂离子电池的健康状态SOH(state of health)进行准确估计是锂离子电池安全稳定运行的重要保障,提出了一种基于容量增量分析ICA(incremental capacity analysis)和Box-Cox变换的锂离子电池SOH估计方法。首先,将电池恒流充电过程的IC曲...对锂离子电池的健康状态SOH(state of health)进行准确估计是锂离子电池安全稳定运行的重要保障,提出了一种基于容量增量分析ICA(incremental capacity analysis)和Box-Cox变换的锂离子电池SOH估计方法。首先,将电池恒流充电过程的IC曲线峰值高度ICP(peak of incremental capacity curve)作为健康特征HF(health factor),数学推导出ICP与健康状态的强相关性。结合卡尔曼滤波算法提取光滑的容量增量曲线。将电池容量衰退过程的前部分周期作为训练周期,通过Box-Cox变换将训练周期的ICP和SOH序列变换成线性关系,然后通过线性拟合来实现剩余周期的SOH估计。在Oxford和NASA数据集上进行实验验证,并与机器学习算法进行对比,结果表明所提方法具有较高的估计精度、较短的计算时间和较强的鲁棒性。展开更多
重点介绍追踪通信用磷酸铁锂电池健康状态(State Of Health,SOH)的重要性,针对通信用磷酸铁锂电池的应用场景提出关注SOH的原因,分析影响电池SOH的内外部关键因素。针对实验估计法、自适应滤波法和数据驱动法3种SOH估算方法进行分析,并...重点介绍追踪通信用磷酸铁锂电池健康状态(State Of Health,SOH)的重要性,针对通信用磷酸铁锂电池的应用场景提出关注SOH的原因,分析影响电池SOH的内外部关键因素。针对实验估计法、自适应滤波法和数据驱动法3种SOH估算方法进行分析,并提出SOH的追踪及未来发展策略。展开更多
准确估计锂离子电池荷电状态(state of charge,SOC)、电池健康度(state of health,SOH)以及预测电池剩余寿命(remaining useful life,RUL)是电池管理的重要内容,对延长电池寿命和保证电池系统可靠性具有重要意义。各国研究人员对电池状...准确估计锂离子电池荷电状态(state of charge,SOC)、电池健康度(state of health,SOH)以及预测电池剩余寿命(remaining useful life,RUL)是电池管理的重要内容,对延长电池寿命和保证电池系统可靠性具有重要意义。各国研究人员对电池状态评估与寿命预测方法进行了大量研究,提出了多种方法。首先,介绍了SOC与SOH的定义及已有估算方法,并进行了对比;然后,介绍了RUL的定义,并对主要方法进行了分类与比较;最后,总结了锂离子电池状态估计与寿命预测方面存在的挑战,并提出了未来的发展方向。展开更多
At present,a life-cycle assessment of energy storage systems(ESSs)is not widely available in the literature.Such an assessment is increasingly vital nowadays as ESS is recognized as one of the important equipment in p...At present,a life-cycle assessment of energy storage systems(ESSs)is not widely available in the literature.Such an assessment is increasingly vital nowadays as ESS is recognized as one of the important equipment in power systems to reduce peak demands for deferring or avoiding augmentation in the network and power generation.As the battery cost is still very high at present,a comprehensive assessment is necessary to determine the optimum ESS capacity so that the maximum financial gain is achievable at the end of the batteries’lifespan.Therefore,an effective life-cycle assessment is proposed in this paper to show how the optimum ESS capacity can be determined such that the maximum net financial gain is achievable at the end of the batteries’lifespan when ESS is used to perform peak demand reductions for the customer or utility companies.The findings reveal the positive financial viability of ESS on the power grid,otherwise the projection of the financial viability is often seemingly poor due to the high battery cost with a short battery lifespan.An improved battery degradation model is used in this assessment,which can simulate the battery degradation accurately in a situation whereby the charging current,discharging current,and temperature of the batteries are intermittent on a site during peak demand reductions.This assessment is crucial to determine the maximum financial benefits brought by ESS.展开更多
电池管理系统BMS(battery management system)是蓄电池储能技术中不可或缺的环节,而电池健康状态SOH(state of health)估算是BMS的重要功能之一。SOH可以为操作员提供电池实际可用容量及老化状态相关信息,进而为电池控制决策提供参考。...电池管理系统BMS(battery management system)是蓄电池储能技术中不可或缺的环节,而电池健康状态SOH(state of health)估算是BMS的重要功能之一。SOH可以为操作员提供电池实际可用容量及老化状态相关信息,进而为电池控制决策提供参考。介绍了锂电池的SOH的含义,阐述了导致锂电池老化和可用容量下降的原因,并着重对当前常见的蓄电池SOH估算方法进行了概括和分析,同时对各种SOH估算方法中存在的问题进行了探讨。展开更多
为研究动力电池组内各单体电池的健康状态SOH(State of Health),对电池极化内阻和欧姆内阻特性进行分析.根据电池欧姆内阻提出相对健康状态的评价方法,并结合电池工作时内阻对端电压的影响,采用端电压对电池组内单体电池健康状态进行评...为研究动力电池组内各单体电池的健康状态SOH(State of Health),对电池极化内阻和欧姆内阻特性进行分析.根据电池欧姆内阻提出相对健康状态的评价方法,并结合电池工作时内阻对端电压的影响,采用端电压对电池组内单体电池健康状态进行评价.最后进行了对比实验验证,实验结果证明了所提方法的准确性和可行性.展开更多
基金supported in part by the National Natural Science Foundation of China(92167201,62273264,61933007)。
文摘The state of health(SOH)is a critical factor in evaluating the performance of the lithium-ion batteries(LIBs).Due to various end-user behaviors,the LIBs exhibit different degradation modes,which makes it challenging to estimate the SOHs in a personalized way.In this article,we present a novel particle swarm optimization-assisted deep domain adaptation(PSO-DDA)method to estimate the SOH of LIBs in a personalized manner,where a new domain adaptation strategy is put forward to reduce cross-domain distribution discrepancy.The standard PSO algorithm is exploited to automatically adjust the chosen hyperparameters of developed DDA-based method.The proposed PSODDA method is validated by extensive experiments on two LIB datasets with different battery chemistry materials,ambient temperatures and charge-discharge configurations.Experimental results indicate that the proposed PSO-DDA method surpasses the convolutional neural network-based method and the standard DDA-based method.The Py Torch implementation of the proposed PSO-DDA method is available at https://github.com/mxt0607/PSO-DDA.
文摘Lithium-ion batteries are the most widely accepted type of battery in the electric vehicle industry because of some of their positive inherent characteristics. However, the safety problems associated with inaccurate estimation and prediction of the state of health of these batteries have attracted wide attention due to the adverse negative effect on vehicle safety. In this paper, both machine and deep learning models were used to estimate the state of health of lithium-ion batteries. The paper introduces the definition of battery health status and its importance in the electric vehicle industry. Based on the data preprocessing and visualization analysis, three features related to actual battery capacity degradation are extracted from the data. Two learning models, SVR and LSTM were employed for the state of health estimation and their respective results are compared in this paper. The mean square error and coefficient of determination were the two metrics for the performance evaluation of the models. The experimental results indicate that both models have high estimation results. However, the metrics indicated that the SVR was the overall best model.
文摘实时估计电动汽车动力电池健康状态(State of Health,SOH),对于充分保证每个电池组的充/放电性能,延长整个电池组的寿命具有重要意义。作为电池管理系统的重要组成部分,相比于电池荷电状态(State of Charge,SOC)和电池均衡系统的研究,SOH估计方法的研究明显落后。简单介绍了SOH的定义及影响因素,按照离线估计方法和在线估计方法进行分类,探讨了常见的SOH估计方法。最后展望了SOH估计方法的发展趋势,指出基于卡尔曼滤波的在线估计和智能学习神经网络的方法将是未来的主流方法。
文摘对锂离子电池的健康状态SOH(state of health)进行准确估计是锂离子电池安全稳定运行的重要保障,提出了一种基于容量增量分析ICA(incremental capacity analysis)和Box-Cox变换的锂离子电池SOH估计方法。首先,将电池恒流充电过程的IC曲线峰值高度ICP(peak of incremental capacity curve)作为健康特征HF(health factor),数学推导出ICP与健康状态的强相关性。结合卡尔曼滤波算法提取光滑的容量增量曲线。将电池容量衰退过程的前部分周期作为训练周期,通过Box-Cox变换将训练周期的ICP和SOH序列变换成线性关系,然后通过线性拟合来实现剩余周期的SOH估计。在Oxford和NASA数据集上进行实验验证,并与机器学习算法进行对比,结果表明所提方法具有较高的估计精度、较短的计算时间和较强的鲁棒性。
文摘准确估计锂离子电池荷电状态(state of charge,SOC)、电池健康度(state of health,SOH)以及预测电池剩余寿命(remaining useful life,RUL)是电池管理的重要内容,对延长电池寿命和保证电池系统可靠性具有重要意义。各国研究人员对电池状态评估与寿命预测方法进行了大量研究,提出了多种方法。首先,介绍了SOC与SOH的定义及已有估算方法,并进行了对比;然后,介绍了RUL的定义,并对主要方法进行了分类与比较;最后,总结了锂离子电池状态估计与寿命预测方面存在的挑战,并提出了未来的发展方向。
文摘At present,a life-cycle assessment of energy storage systems(ESSs)is not widely available in the literature.Such an assessment is increasingly vital nowadays as ESS is recognized as one of the important equipment in power systems to reduce peak demands for deferring or avoiding augmentation in the network and power generation.As the battery cost is still very high at present,a comprehensive assessment is necessary to determine the optimum ESS capacity so that the maximum financial gain is achievable at the end of the batteries’lifespan.Therefore,an effective life-cycle assessment is proposed in this paper to show how the optimum ESS capacity can be determined such that the maximum net financial gain is achievable at the end of the batteries’lifespan when ESS is used to perform peak demand reductions for the customer or utility companies.The findings reveal the positive financial viability of ESS on the power grid,otherwise the projection of the financial viability is often seemingly poor due to the high battery cost with a short battery lifespan.An improved battery degradation model is used in this assessment,which can simulate the battery degradation accurately in a situation whereby the charging current,discharging current,and temperature of the batteries are intermittent on a site during peak demand reductions.This assessment is crucial to determine the maximum financial benefits brought by ESS.
文摘电池管理系统BMS(battery management system)是蓄电池储能技术中不可或缺的环节,而电池健康状态SOH(state of health)估算是BMS的重要功能之一。SOH可以为操作员提供电池实际可用容量及老化状态相关信息,进而为电池控制决策提供参考。介绍了锂电池的SOH的含义,阐述了导致锂电池老化和可用容量下降的原因,并着重对当前常见的蓄电池SOH估算方法进行了概括和分析,同时对各种SOH估算方法中存在的问题进行了探讨。
文摘为研究动力电池组内各单体电池的健康状态SOH(State of Health),对电池极化内阻和欧姆内阻特性进行分析.根据电池欧姆内阻提出相对健康状态的评价方法,并结合电池工作时内阻对端电压的影响,采用端电压对电池组内单体电池健康状态进行评价.最后进行了对比实验验证,实验结果证明了所提方法的准确性和可行性.
