Battery packs are applied in various areas(e.g.,electric vehicles,energy storage,space,mining,etc.),which requires the state of health(SOH)to be accurately estimated.Inconsistency,also known as cell variation,is consi...Battery packs are applied in various areas(e.g.,electric vehicles,energy storage,space,mining,etc.),which requires the state of health(SOH)to be accurately estimated.Inconsistency,also known as cell variation,is considered a significant evaluation index that greatly affects the degradation of battery pack.This paper proposes a novel joint inconsistency and SOH estimation method under cycling,which fills the gap of joint estimation based on the fast-charging process for electric vehicles.First,fifteen features are extracted from current change points during the partial charging process.Then,a joint estimation system is designed,where fusion weights are obtained by the analytic hierarchy process and multi-scale sample entropy to evaluate inconsistency.A wrapper is used to select the optimal feature subset,and Gaussian process regression is implemented to estimate the SOH.Finally,the estimation performance is assessed by the test data.The results show that the inconsistency evaluation can reflect the aging conditions,and the inconsistency does affect the aging process.The wrapper selection method improves the accuracy of SOH estimation by about 75.8%compared to the traditional filter method when only 10%of data is used for model training.The maximum absolute error and root mean square error are 2.58%and 0.93%,respectively.展开更多
依据相关设计规范、标准要求,探讨医疗建筑中UPS(Uninterruptible Power Supply,不间断电源)的设计和选择要点。提出应根据负荷性质、电源输入要求、动态输出特性等因素进行医疗场所的UPS选型;并通过计算示例,探讨医疗场所UPS的容量计...依据相关设计规范、标准要求,探讨医疗建筑中UPS(Uninterruptible Power Supply,不间断电源)的设计和选择要点。提出应根据负荷性质、电源输入要求、动态输出特性等因素进行医疗场所的UPS选型;并通过计算示例,探讨医疗场所UPS的容量计算和电池选择。展开更多
针对越来越多保供电需求的服务,电力服务商应根据不同的用户在不同的场合提出具体的适用的保供电电源。具体保供电电源应用设计应考虑方便快捷,安装简易等因素,采用车载的方式保证移动性需求。根据后备时间为15 min的要求设计车载式UPS(...针对越来越多保供电需求的服务,电力服务商应根据不同的用户在不同的场合提出具体的适用的保供电电源。具体保供电电源应用设计应考虑方便快捷,安装简易等因素,采用车载的方式保证移动性需求。根据后备时间为15 min的要求设计车载式UPS(Uninterrupted Power Supply)的蓄电池部分。在车厢长度和车辆承重的限制下,并考虑震动影响,着重就几种典型蓄电池,包括铅酸蓄电池和锂离子蓄电池的典型代表展开讨论,详细介绍这两类蓄电池的选型及计算。展开更多
基金This work was supported in part by the National Natural Science Foundation of China(Grant No.51875054 and Grant No.U1864212)Graduate research and innovation foundation of Chongqing,China(Grant No.CYS20018)Chongqing Natural Science Foundation for Distinguished Young Scholars(Grant No.cstc2019jcyjjq0010),and Chongqing Science and Technology Bureau,China.
文摘Battery packs are applied in various areas(e.g.,electric vehicles,energy storage,space,mining,etc.),which requires the state of health(SOH)to be accurately estimated.Inconsistency,also known as cell variation,is considered a significant evaluation index that greatly affects the degradation of battery pack.This paper proposes a novel joint inconsistency and SOH estimation method under cycling,which fills the gap of joint estimation based on the fast-charging process for electric vehicles.First,fifteen features are extracted from current change points during the partial charging process.Then,a joint estimation system is designed,where fusion weights are obtained by the analytic hierarchy process and multi-scale sample entropy to evaluate inconsistency.A wrapper is used to select the optimal feature subset,and Gaussian process regression is implemented to estimate the SOH.Finally,the estimation performance is assessed by the test data.The results show that the inconsistency evaluation can reflect the aging conditions,and the inconsistency does affect the aging process.The wrapper selection method improves the accuracy of SOH estimation by about 75.8%compared to the traditional filter method when only 10%of data is used for model training.The maximum absolute error and root mean square error are 2.58%and 0.93%,respectively.
文摘针对越来越多保供电需求的服务,电力服务商应根据不同的用户在不同的场合提出具体的适用的保供电电源。具体保供电电源应用设计应考虑方便快捷,安装简易等因素,采用车载的方式保证移动性需求。根据后备时间为15 min的要求设计车载式UPS(Uninterrupted Power Supply)的蓄电池部分。在车厢长度和车辆承重的限制下,并考虑震动影响,着重就几种典型蓄电池,包括铅酸蓄电池和锂离子蓄电池的典型代表展开讨论,详细介绍这两类蓄电池的选型及计算。
