WO2017143830A1 - Method and device for detecting state of health of battery, and battery management system - Google Patents

Method and device for detecting state of health of battery, and battery management system Download PDF

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WO2017143830A1
WO2017143830A1 PCT/CN2016/108829 CN2016108829W WO2017143830A1 WO 2017143830 A1 WO2017143830 A1 WO 2017143830A1 CN 2016108829 W CN2016108829 W CN 2016108829W WO 2017143830 A1 WO2017143830 A1 WO 2017143830A1
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battery
current
soc
interval
discharging
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PCT/CN2016/108829
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French (fr)
Chinese (zh)
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蒋建平
苏来锁
李哲
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华为技术有限公司
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392Determining battery ageing or deterioration, e.g. state of health

Abstract

A method and device for detecting the state of health (SOH) of a battery, and a battery management system. The method comprises: determining whether the present state of charge (SOC) of a battery falls within an intersection interval of a linear interval of an SOC-open circuit voltage (OCV) relation and a linear interval of a direct current internal resistance (DCIR)-SOC relation of the battery, and determining whether the present current of the battery falls within a current interval corresponding to the intersection interval; and if the SOC of the battery falls within the intersection interval and the current I falls within the current interval, obtaining the capacity before aging and the capacity after aging of the battery during the charging or discharging of the battery, thereby accurately estimating the SOH of the battery.

Description

检测电池健康状态的方法、装置和电池管理系统Method, device and battery management system for detecting battery health

本申请要求于2016年02月22日提交中国专利局、申请号为201610096341.2、发明名称为“检测电池健康状态的方法、装置和电池管理系统”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。The present application claims priority to Chinese Patent Application No. 201610096341.2, entitled "Method, Apparatus and Battery Management System for Detecting Battery Health Status", filed on February 22, 2016, the entire contents of which are incorporated by reference. Combined in this application.

技术领域Technical field

本发明实施例涉及电池领域,尤其涉及电池领域中的检测电池健康状态的方法、装置和电池管理系统。Embodiments of the present invention relate to the field of batteries, and in particular, to a method, apparatus, and battery management system for detecting a battery health state in the field of batteries.

背景技术Background technique

作为一种储存电能的装置,电池在很多领域都有越来越重要的应用,其中,电池的应用有固定储能(例如数据中心,通信基站)和移动储能(例如便携式终端、电动车)。在上述电池的应用领域中,预测电池的健康状态(State Of Health,简称“SOH”)对用户来说十分重要,该技术可供用户实时掌握电池的健康情况,预知风险故障,提前采取相应措施。As a device for storing electrical energy, batteries have become more and more important applications in many fields, among which battery applications have fixed energy storage (such as data centers, communication base stations) and mobile energy storage (such as portable terminals, electric vehicles). . In the application field of the above battery, it is very important for the user to predict the state of health ("SOH"), which is available for the user to grasp the health condition of the battery in real time, predict the risk failure, and take corresponding measures in advance. .

诊断电池SOH的关键衡量参数是保持容量,用户可以根据这一参数实时获知电池对业务的支撑能力。目前,大多数电池SOH预测的方法,是模拟电池工况离线测试电池的循环或存储寿命,通过累计电池循环次数或存储时间来预测电池SOH。但是,该方法需要长时间的离线测试,且无法实时地准确获取电池保持容量。The key measurement parameter for diagnosing battery SOH is to maintain capacity. Based on this parameter, users can know the battery's ability to support the service in real time. At present, most battery SOH prediction methods are to simulate battery cycle conditions to test the cycle or storage life of the battery, and to predict the battery SOH by accumulating the number of battery cycles or storage time. However, this method requires a long-term offline test and cannot accurately obtain the battery holding capacity in real time.

另外,也有一些技术方法采用在线测量内阻或通过局部放电预测电池SOH。此类方法最大的困难在于,如何建立内阻或局部放电容量与电池出厂状态下的容量之间的关系,准确预测出电池SOH。In addition, there are some technical methods to measure the internal resistance of the wire or to predict the battery SOH by partial discharge. The biggest difficulty of this type of method is how to establish the relationship between internal resistance or partial discharge capacity and the capacity of the battery in the factory state, and accurately predict the battery SOH.

因此,以电池内阻作为参数衡量电池SOH,不能准确表征电池容量信息;以电池的保持容量作为参数衡量电池SOH,在通信基站、数据中心等应用场景下风险极大。Therefore, the battery SOH is measured by the internal resistance of the battery as the parameter, and the battery capacity information cannot be accurately characterized. The battery SOH is measured by the battery's holding capacity as a parameter, which is extremely risky in application scenarios such as communication base stations and data centers.

发明内容Summary of the invention

本发明实施例提供了一种检测电池健康状态的方法,能够在电池充电或放电过程中,获取电池的老化前容量和电池的老化后容量,从而准确估算电 池SOH。Embodiments of the present invention provide a method for detecting a health state of a battery, which can obtain a capacity before aging of the battery and an aging capacity of the battery during charging or discharging of the battery, thereby accurately estimating the electric quantity. Pool SOH.

第一方面,本发明实施例提供了一种检测电池健康状态的方法,该方法包括:In a first aspect, an embodiment of the present invention provides a method for detecting a health state of a battery, the method comprising:

判断电池的当前荷电状态SOC是否处于电池的SOC-开路电压OCV关系的线性区间和直流内阻DCIR-SOC关系的线性区间的交叉区间,并判断电池的当前电流是否处于与交叉区间对应的电流区间;Determining whether the current state of charge SOC of the battery is in the intersection of the linear interval of the SOC-open circuit voltage OCV relationship of the battery and the linear interval of the direct current resistance DCIR-SOC relationship, and determining whether the current current of the battery is in a current corresponding to the intersection interval Interval

若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电,并确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ;If the current SOC is in the intersection interval and the current current is in the current interval, charging or discharging the battery, and determining the changing voltage ΔV during charging or discharging and the aging capacity ΔQ of the battery;

根据变化电压ΔV,确定电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;

根据电池的老化前容量ΔQ0和电池的老化后容量ΔQ,确定电池健康状态SOH。The battery health state SOH is determined based on the pre-aged capacity ΔQ 0 of the battery and the post-aged capacity ΔQ of the battery.

因此,本发明实施例的检测电池健康状态的方法,首先确定电池的SOC处于交叉区间且电流I处于交叉区间对应的电流区间,能够在电池充电或放电过程中,获取电池老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, in the method for detecting the health state of the battery in the embodiment of the present invention, first, it is determined that the SOC of the battery is in a cross section and the current I is in a current interval corresponding to the intersection interval, and the capacity and the battery before the aging of the battery can be obtained during charging or discharging of the battery. Capacity after aging to accurately estimate battery SOH.

可选地,判断电池当前SOC和当前电流分别处于第一限定区域和第二限定区域;Optionally, determining that the current SOC and the current current of the battery are respectively in the first limited area and the second limited area;

若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电,并确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ;If the current SOC is in the intersection interval and the current current is in the current interval, charging or discharging the battery, and determining the changing voltage ΔV during charging or discharging and the aging capacity ΔQ of the battery;

根据变化电压ΔV,确定电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;

根据电池的老化前容量ΔQ0和老化后容量ΔQ,确定电池SOH。The battery SOH is determined based on the pre-aging capacity ΔQ 0 of the battery and the post-aging capacity ΔQ.

因此,本发明实施例的检测电池健康状态的方法,首先确定电池的SOC处于第一限定区域且电流I处于第二限定区域,能够在电池充电或放电过程中,获取电池老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, the method for detecting the health state of the battery in the embodiment of the present invention first determines that the SOC of the battery is in the first limited area and the current I is in the second limited area, and can obtain the capacity of the battery before aging and the battery during charging or discharging of the battery. Capacity after aging to accurately estimate battery SOH.

可选地,第一限定区域为电池SOC-OCV关系的线性区间和DCIR-SOC关系的线性区间的交叉区间,第二限定区域为该交叉区间对应的电流区间。Optionally, the first limited area is a cross section of a linear interval of a battery SOC-OCV relationship and a linear section of a DCIR-SOC relationship, and the second limited area is a current interval corresponding to the intersection interval.

因此,本发明实施例的检测电池健康状态的方法,通过限定电池SOC处于电池SOC-OCV关系的线性区间和DCIR-SOC关系的线性区间的交叉区间,且电流I处于该交叉区间对应的电流区间,能够得到更准确的电池SOC 和电流I,从而能够准确估算电池SOH,提高SOH的计算精度。Therefore, the method for detecting the health state of the battery according to the embodiment of the present invention limits the battery SOC to a cross section of a linear interval of a battery SOC-OCV relationship and a linear interval of a DCIR-SOC relationship, and the current I is in a current interval corresponding to the intersection interval. Can get more accurate battery SOC And the current I, so that the battery SOH can be accurately estimated, and the calculation accuracy of the SOH is improved.

可选地,确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ,包括:Optionally, determining the varying voltage ΔV during charging or discharging and the post-aging capacity ΔQ of the battery include:

对电池充电或放电Δt时间后,若电池充电或放电后SOC处于交叉区间且充电或放电后电流I处于电流区间,则确定充电或放电过程中的变化电压ΔV和对电流I进行积分得到的电池的老化后容量ΔQ。After charging or discharging the battery for Δt time, if the SOC is in the intersection interval after charging or discharging the battery and the current I is in the current interval after charging or discharging, the changing voltage ΔV during charging or discharging and the battery obtained by integrating the current I are determined. The capacity ΔQ after aging.

因此,本发明实施例的检测电池健康状态的方法,通过对电池充电或放电Δt时间后,判断电池充电或放电后SOC处于交叉区间且电流I处于电流区间内,能够在电池充电或放电过程中,获取电池老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, in the method for detecting the health state of the battery according to the embodiment of the present invention, after charging or discharging the battery for Δt time, it is determined that the SOC is in the intersection interval after the battery is charged or discharged, and the current I is in the current interval, which can be in the process of charging or discharging the battery. Obtain the battery capacity before aging and the aging capacity of the battery to accurately estimate the battery SOH.

可选地,根据变化电压ΔV,确定电池的老化前容量ΔQ0,包括:Optionally, determining the pre-aging capacity ΔQ 0 of the battery according to the variation voltage ΔV includes:

根据出厂电池SOC-OCV关系,确定变化电压ΔV对应的电池的老化前容量ΔQ0The pre-aging capacity ΔQ 0 of the battery corresponding to the varying voltage ΔV is determined according to the factory battery SOC-OCV relationship.

可选地,根据变化电压ΔV,确定电池的老化前容量ΔQ0,包括:Optionally, determining the pre-aging capacity ΔQ 0 of the battery according to the variation voltage ΔV includes:

根据出厂电池SOC-OCV关系,在交叉区间内,确定变化电压ΔV对应的电池的老化前容量ΔQ0Based on the factory battery SOC-OCV relationship, the pre-aging capacity ΔQ 0 of the battery corresponding to the varying voltage ΔV is determined within the cross section.

因此,本发明实施例的检测电池健康状态的方法,通过出厂电池SOC-OCV关系,能够快速准确地确定变化电压ΔV对应的电池的老化前容量ΔQ0Therefore, in the method for detecting the health state of the battery according to the embodiment of the present invention, the pre-aging capacity ΔQ 0 of the battery corresponding to the variation voltage ΔV can be quickly and accurately determined by the SOC-OCV relationship of the factory battery.

可选地,根据电池的老化前容量ΔQ0和电池的老化后容量ΔQ,确定电池SOH,包括:Optionally, determining the battery SOH according to the pre-aging capacity ΔQ 0 of the battery and the post-aging capacity ΔQ of the battery, including:

根据电池的老化前容量ΔQ0和电池的老化后容量ΔQ的比值,确定电池SOH。The battery SOH is determined based on the ratio of the pre-aging capacity ΔQ 0 of the battery to the post-aged capacity ΔQ of the battery.

可选地,电池的老化后容量ΔQ为:Optionally, the aging capacity ΔQ of the battery is:

Figure PCTCN2016108829-appb-000001
Figure PCTCN2016108829-appb-000001

其中,I为电池充电或放电过程中的电流,Δt=t2-t1,t1为充电或放电过程的起始时刻,t2为对I进行积分的终止时刻。Where I is the current during charging or discharging of the battery, Δt=t 2 -t 1 , t 1 is the starting moment of the charging or discharging process, and t 2 is the ending moment of integrating I.

可选地,根据出厂电池SOC-OCV关系,确定变化电压ΔV对应的电池的老化前容量ΔQ0,包括:Optionally, determining the pre-aging capacity ΔQ 0 of the battery corresponding to the variation voltage ΔV according to the factory battery SOC-OCV relationship, including:

在出厂电池SOC-OCV关系曲线上,截取与变化电压ΔV相等的ΔOCV;Obtaining ΔOCV equal to the varying voltage ΔV on the factory battery SOC-OCV relationship curve;

根据ΔOCV确定对应的ΔSOC0Corresponding ΔSOC 0 is determined according to ΔOCV;

根据ΔSOC0确定ΔQ0,其中,ΔQ0=Q0×ΔSOC0,Q0为电池出厂时的初始容量。ΔSOC 0 determined according ΔQ 0, wherein, ΔQ 0 = Q 0 × ΔSOC 0, Q 0 of the initial capacity of the battery factory.

可选地,当电池的正极为三元材料,负极为石墨时,交叉区间内SOC为40%-90%,且电流区间内电流I为0.2C-2C。Optionally, when the positive electrode of the battery is a ternary material and the negative electrode is graphite, the SOC in the cross section is 40%-90%, and the current I in the current interval is 0.2 C-2C.

可选地,电池为铅酸电池或镍镉电池或镍氢电池或锂离子二次电池。Alternatively, the battery is a lead acid battery or a nickel cadmium battery or a nickel hydride battery or a lithium ion secondary battery.

第二方面,本发明实施例提供了一种检测电池健康状态的装置,包括:In a second aspect, an embodiment of the present invention provides an apparatus for detecting a health status of a battery, including:

判断单元,用于判断电池的当前荷电状态SOC是否处于电池的SOC-开路电压OCV关系的线性区间和直流内阻DCIR-SOC关系的线性区间的交叉区间,并判断电池的当前电流是否处于与交叉区间对应的电流区间;The determining unit is configured to determine whether the current state of charge SOC of the battery is in a cross section of a linear interval of a SOC-open circuit voltage OCV relationship of the battery and a linear section of a DC internal resistance DCIR-SOC relationship, and determine whether the current current of the battery is in a Current interval corresponding to the intersection interval;

充放电单元,用于判断单元判断若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电;a charging and discharging unit, configured to determine, by the unit, that the current SOC is in a cross section and the current current is in a current interval, charging or discharging the battery;

数据处理单元,用于确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ;a data processing unit for determining a varying voltage ΔV during charging or discharging and a post-aging capacity ΔQ of the battery;

根据变化电压ΔV,确定电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;

根据电池的老化前容量ΔQ0和老化后容量ΔQ,确定电池SOH。The battery SOH is determined based on the pre-aging capacity ΔQ 0 of the battery and the post-aging capacity ΔQ.

该装置用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。The apparatus is for performing the method of any of the first aspect or the first aspect of the first aspect described above.

因此,本发明实施例的检测电池健康状态的装置,首先确定电池的SOC处于交叉区间且电流I处于交叉区间对应的电流区间,能够在电池充电或放电过程中,获取电池老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, the apparatus for detecting the health state of the battery in the embodiment of the present invention first determines that the SOC of the battery is in the intersection interval and the current I is in the current interval corresponding to the intersection interval, and can obtain the capacity and the battery before the aging of the battery during charging or discharging of the battery. Capacity after aging to accurately estimate battery SOH.

第三方面,本发明实施例提供了一种检测电池健康状态的装置,该装置包括处理器,处理器用于执行指令,该指令包括:In a third aspect, an embodiment of the present invention provides an apparatus for detecting a health status of a battery, the apparatus comprising a processor, the processor is configured to execute an instruction, and the instruction includes:

判断电池的当前荷电状态SOC是否处于电池的SOC-开路电压OCV关系的线性区间和直流内阻DCIR-SOC关系的线性区间的交叉区间,并判断电池的当前电流是否处于与交叉区间对应的电流区间;Determining whether the current state of charge SOC of the battery is in the intersection of the linear interval of the SOC-open circuit voltage OCV relationship of the battery and the linear interval of the direct current resistance DCIR-SOC relationship, and determining whether the current current of the battery is in a current corresponding to the intersection interval Interval

若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电,并确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ;If the current SOC is in the intersection interval and the current current is in the current interval, charging or discharging the battery, and determining the changing voltage ΔV during charging or discharging and the aging capacity ΔQ of the battery;

根据变化电压ΔV,确定电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;

根据电池的老化前容量ΔQ0和电池的老化后容量ΔQ,确定电池健康状 态SOH。The battery health state SOH is determined based on the pre-aged capacity ΔQ 0 of the battery and the post-aged capacity ΔQ of the battery.

当该处理器执行指令时,该执行使得该处理器执行第一方面或第一方面的任意可能的实现方式中的方法。When the processor executes the instructions, the execution causes the processor to perform the method of the first aspect or any of the possible implementations of the first aspect.

第四方面,本发明实施例提供了一种电池管理系统,包括如第二方面或第二方面的任一可能的实现方式中的装置。In a fourth aspect, an embodiment of the present invention provides a battery management system, including the device in any of the possible implementations of the second aspect or the second aspect.

因此,本发明实施例的检测电池健康状态的系统,首先确定电池的SOC交叉区间且电流I处于交叉区间对应的电流区间,能够在电池充电或放电过程中,获取电池老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, the system for detecting the health state of the battery in the embodiment of the present invention first determines the SOC cross section of the battery and the current I is in the current interval corresponding to the intersection interval, and can obtain the capacity of the battery before aging and the aging of the battery during charging or discharging of the battery. Post capacity to accurately estimate battery SOH.

附图说明DRAWINGS

图1是本发明实施例的检测电池健康状态的方法的示意性流程图;1 is a schematic flowchart of a method for detecting a health state of a battery according to an embodiment of the present invention;

图2是本发明实施例的检测电池健康状态的方法的另一示意性流程图;2 is another schematic flowchart of a method for detecting a health state of a battery according to an embodiment of the present invention;

图3是本发明实施例的镍钴铝-石墨电池的荷电状态-开路电压的线性区间的示意图;3 is a schematic view showing a linear range of a state of charge-open circuit voltage of a nickel-cobalt aluminum-graphite battery according to an embodiment of the present invention;

图4是本发明实施例的镍钴铝-石墨电池的直流内阻-荷电状态的示意图;4 is a schematic view showing a DC internal resistance-charge state of a nickel-cobalt aluminum-graphite battery according to an embodiment of the present invention;

图5是本发明实施例的出厂电池的荷电状态-开路电压的示意图;5 is a schematic diagram of a state of charge-open circuit voltage of a factory battery according to an embodiment of the present invention;

图6是本发明实施例的检测电池健康状态的装置的示意图;6 is a schematic diagram of an apparatus for detecting a health state of a battery according to an embodiment of the present invention;

图7是本发明实施例的检测电池健康状态的装置的另一示意图;7 is another schematic diagram of an apparatus for detecting a health state of a battery according to an embodiment of the present invention;

图8是本发明实施例的电池管理系统的示意图。Figure 8 is a schematic illustration of a battery management system in accordance with an embodiment of the present invention.

具体实施方式detailed description

下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行描述。The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

应理解,本发明实施例可以应用于储能领域的电池管理系统(battery management system,简称“BMS”),还可以应用于某些对快速诊断要求很高的应用场景,如基站备电、数据中心等,此外,还可以作为电动车用电池的健康状态诊断与估计的方法。It should be understood that the embodiments of the present invention can be applied to a battery management system (BMS) in the field of energy storage, and can also be applied to some application scenarios that require high speed diagnosis, such as base station backup and data. In addition, it can also be used as a method for diagnosing and estimating the health of batteries for electric vehicles.

目前,检测电池SOH的方法可以是通过估算电池荷电状态(State of Charge,简称“SOC”)进而估算SOH,该方法通过将多个单体电池串联,以得到电池组模型,再选择电池组的SOC作为状态变量,单体电池的负载电 压的最小值作为输出变量,电池组的电流作为输入变量,并结合卡尔曼滤波算法,建立计算状态变量的第一方程和输出变量的第二方程,再对第一方程和第二方程运用自适应卡尔曼滤波算法,从而预测电池组的SOC,并运用安时法预测电池组的SOH。At present, the method for detecting the battery SOH may be to estimate the SOH by estimating a state of charge ("SOC"), which is obtained by connecting a plurality of single cells in series to obtain a battery model, and then selecting a battery pack. SOC as a state variable, the load of a single battery The minimum value of the pressure is used as the output variable, and the current of the battery pack is used as the input variable. Combined with the Kalman filter algorithm, the second equation for calculating the first equation and the output variable of the state variable is established, and then the first equation and the second equation are applied. The Kalman filter algorithm is adapted to predict the SOC of the battery pack, and the SOH of the battery pack is predicted by the An-time method.

具体地,第一方程与第二方程分别指对通过电池的电流进行积分的方程和输出电压的表达式,将第一方与第二方程作为两个基本方程输入卡尔曼滤波器中可得出电池SOC。Specifically, the first equation and the second equation respectively refer to an equation for integrating the current through the battery and an expression of the output voltage, and the first and second equations are input into the Kalman filter as two basic equations. Battery SOC.

应理解SOH可以通过

Figure PCTCN2016108829-appb-000002
计算得到,其中,Cn为已知的额定容量,Ca为最大可用容量。It should be understood that SOH can pass
Figure PCTCN2016108829-appb-000002
Calculated, where C n is the known rated capacity and C a is the maximum available capacity.

应理解,该方法定位于SOC(t1+Δt)与SOC(t1)之间,通过采样周期为Δt内的容量变化来确定最大可用容量Ca,进而估算出SOH,其中,SOC(t1)为某一时刻的SOC,SOC(t1+Δt)为SOC(t1)经历Δt时间后的SOC。It should be understood that the method is located between SOC(t 1 +Δt) and SOC(t 1 ), and the maximum available capacity Ca is determined by the capacity change in the sampling period Δt, thereby estimating the SOH, where SOC(t 1 ) is the SOC at a certain time, and SOC(t 1 + Δt) is the SOC after Δt time after SOC(t 1 ).

该方法在目前电池SOH估算算法中非常具有典型性,此方法利用了电池通常会进行不完全满充电或满放电这一特点,通过建立局部充放电与电池满充电或满放电之间的关系,估算出电池SOH。This method is very typical in the current battery SOH estimation algorithm. This method utilizes the characteristics that the battery usually performs incomplete full charge or full discharge, and establishes the relationship between local charge and discharge and full or full discharge of the battery. The battery SOH is estimated.

但是,该方法在检测SOH中存在以下问题:一方面,该方法通过确定SOC(t1+Δt)与SOC(t1)两个点之间的容量进而确定电池SOH,但是电池SOC随老化变化会发生漂移,因而无法同时在新老电池中准确标定这两个点;另一方面,目前电池SOC的估算还不精确,其精确度大约在5%~10%之间,通过对SOC的估计进行对SOH标定,无疑会将SOC误差引入SOH中,因此,该方法在测量SOH时不可避免地难以达到要求的高精度。However, this method has the following problems in detecting SOH: On the one hand, the method determines the battery SOH by determining the capacity between the two points of SOC(t 1 +Δt) and SOC(t 1 ), but the battery SOC changes with aging. There will be drift, so it is impossible to accurately calibrate these two points in the old and new batteries at the same time; on the other hand, the current battery SOC estimation is not accurate, and its accuracy is about 5% to 10%, through the estimation of SOC Performing calibration on SOH will undoubtedly introduce SOC errors into the SOH. Therefore, this method is inevitably difficult to achieve the required high precision when measuring SOH.

图1是本发明实施例的检测电池健康状态的方法,如图1所示,该方法可以包括:1 is a method for detecting a health state of a battery according to an embodiment of the present invention. As shown in FIG. 1, the method may include:

S110,判断电池的当前SOC是否处于电池的SOC-开路电压开路电压(Open Circuit Voltage,检测“OCV”)关系的线性区间和直流内阻(Direct Current Internal Resistance,简称“DCIR”)-SOC关系的线性区间的交叉区间,并判断电池的当前电流是否处于与交叉区间对应的电流区间;S110. Determine whether the current SOC of the battery is in a linear interval of a SOC-Open Circuit Voltage (OCV) relationship of the battery and a Direct Current Internal Resistance (DCIR)-SOC relationship. a cross section of the linear interval, and determining whether the current current of the battery is in a current interval corresponding to the intersection interval;

在S110中,可以首先确定电池当前SOC是否处于SOC-OCV关系的线性区域;其次,可以确定当前电流I是否处于DCIR-SOC关系的线性区域,DCIR-SOC关系的线性区域不仅与电池类型有关,而且与充电或放电的电流有关。 In S110, it may first be determined whether the current SOC of the battery is in a linear region of the SOC-OCV relationship; secondly, it may be determined whether the current current I is in a linear region of a DCIR-SOC relationship, and the linear region of the DCIR-SOC relationship is not only related to the battery type, It is also related to the current of charging or discharging.

应理解,SOC-OCV关系的线性区间和DCIR-SOC关系的线性区间的交叉区间可以为SOC-OCV关系的线性区域和DCIR-SOC的线性区域的交集,即交叉区间为SOC区间,该交叉区间会有对应的电流区间。It should be understood that the intersection interval between the linear interval of the SOC-OCV relationship and the linear interval of the DCIR-SOC relationship may be the intersection of the linear region of the SOC-OCV relationship and the linear region of the DCIR-SOC, that is, the intersection interval is the SOC interval, and the intersection interval There will be a corresponding current range.

应理解,SOC-OCV关系和DCIR-SOC关系都是函数关系,SOC是自变量,交叉区间是自变量SOC的范围,该交叉区间对应的电流区间是电流的范围。It should be understood that the SOC-OCV relationship and the DCIR-SOC relationship are both functional relationships, the SOC is an independent variable, the intersection interval is the range of the independent variable SOC, and the current interval corresponding to the intersection interval is the range of the current.

还应理解,在线性区域,电池老化前后的SOC-OCV关系一致,因此,本发明实施例的SOC-OCV关系可以是出厂SOC-OCV关系,还可以是老化后的SOC-OCV关系。It should also be understood that in the linear region, the SOC-OCV relationship before and after the battery aging is consistent. Therefore, the SOC-OCV relationship of the embodiment of the present invention may be a factory SOC-OCV relationship or an SOC-OCV relationship after aging.

还应理解,SOC-OCV关系和DCIR-SOC关系都可以是出厂电池SOC-OCV关系和出厂电池DCIR-SOC关系。It should also be understood that both the SOC-OCV relationship and the DCIR-SOC relationship may be the factory battery SOC-OCV relationship and the factory battery DCIR-SOC relationship.

可选地,当电池的正极为三元材料,负极为石墨,交叉区间内的SOC为40%-90%,且电流区间内的电流I为0.2C-2C。Alternatively, when the positive electrode of the battery is a ternary material and the negative electrode is graphite, the SOC in the cross section is 40%-90%, and the current I in the current interval is 0.2 C-2C.

具体地,C表示为根据电池容量确定的电流,C的单位是安时(Ah),即1小时内的放电容量。Specifically, C is expressed as a current determined according to the battery capacity, and the unit of C is Ams (Ah), that is, the discharge capacity within 1 hour.

应理解,该线性交叉区间可以根据电池的材料确定,例如,以石墨为负极,镍钴铝(LiNi0.8Co0.15Al0.05O2,简称“NCA”)三元材料为正极的电池,交叉区间内的SOC为40%-90%,且交叉区间对应的电流区间为0.2C-2C。It should be understood that the linear cross section may be determined according to the material of the battery, for example, a battery with a graphite as a negative electrode and a nickel-cobalt aluminum (LiNi 0.8 Co 0.15 A l0.05 O 2 , referred to as "NCA") ternary material as a positive electrode, cross The SOC in the interval is 40%-90%, and the current interval corresponding to the intersection interval is 0.2C-2C.

S120,若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电,并确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ。S120: If the current SOC is in the intersection interval and the current current is in the current interval, the battery is charged or discharged, and the variation voltage ΔV during charging or discharging and the aging capacity ΔQ of the battery are determined.

在S120中,电池的老化后容量ΔQ为变化电压ΔV范围内的电池容量数据,根据电池的老化后容量ΔQ,可以准确估计电池SOH。In S120, the battery aging capacity ΔQ is the battery capacity data in the range of the variation voltage ΔV, and the battery SOH can be accurately estimated based on the aging capacity ΔQ of the battery.

应理解,通常电池在使用一定时间后会产生老化,可以通过对充电或放电过程中电流进行的积分,从而可以确定电池老化后的容量ΔQ。It should be understood that in general, the battery may be aged after being used for a certain period of time, and the capacity ΔQ after the battery is aged can be determined by integrating the current during charging or discharging.

可选地,对电池充电或放电Δt时间后,若电池充电或放电后SOC处于交叉区间且充电或放电后电流处于电流区间,则确定充电或放电过程中的变化电压ΔV,并对充电或放电过程中的电流进行积分以确定电池的老化后容量ΔQ。Optionally, after charging or discharging the battery for Δt time, if the SOC is in the intersection interval after charging or discharging the battery and the current is in the current interval after charging or discharging, determining the changing voltage ΔV during charging or discharging, and charging or discharging The current in the process is integrated to determine the post-aging capacity ΔQ of the battery.

具体地,S120包括:若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电,在充电或放电Δt时间后,判断电池充电或放 电后SOC是否处于交叉区间且充电或放电后电流是否处于电流区间,若电池充电或放电后SOC处于交叉区间且充电或放电后电流处于电流区间,则确定充电或放电过程中的变化电压ΔV,并对充电或放电过程中的电流进行积分以确定电池的老化后容量ΔQ。Specifically, S120 includes: if the current SOC is in a cross section and the current current is in a current interval, charging or discharging the battery, and determining whether the battery is charged or discharged after charging or discharging Δt time Whether the SOC is in the intersection interval after the electric charge and whether the current is in the current interval after charging or discharging. If the SOC is in the intersection interval after the battery is charged or discharged and the current is in the current interval after charging or discharging, the changing voltage ΔV in the charging or discharging process is determined, The current during charging or discharging is integrated to determine the aging capacity ΔQ of the battery.

S130,根据变化电压ΔV,确定电池的老化前容量ΔQ0S130, determining a pre-aging capacity ΔQ 0 of the battery according to the variation voltage ΔV.

在S130中,可以根据出厂电池SOC-OCV关系,在交叉区间内,确定变化电压ΔV对应的电池的老化前容量ΔQ0In S130, the pre-aging capacity ΔQ 0 of the battery corresponding to the varying voltage ΔV can be determined in the cross section based on the factory battery SOC-OCV relationship.

应理解,还可以根据老化后电池SOC-OCV关系,在交叉区间内,确定变化电压ΔV对应的电池的老化前容量ΔQ0It should be understood that the pre-aging capacity ΔQ 0 of the battery corresponding to the variation voltage ΔV may also be determined in the cross section according to the SOC-OCV relationship of the battery after aging.

S140,根据电池的老化前容量ΔQ0和老化后容量ΔQ,确定SOH。S140, determining SOH according to the pre-aging capacity ΔQ 0 of the battery and the post-aging capacity ΔQ.

在S140中,可以根据ΔQ和ΔQ0的比值确定SOH,在确定SOH后,可以对SOH的历史数据进行更新。In S140, the SOH may be determined according to the ratio of ΔQ and ΔQ 0 , and after the SOH is determined, the historical data of the SOH may be updated.

具体地,利用电池SOC-OCV关系线性区间及DCIR-SOC关系线性区间中的交叉区间的电压变化,即变化电压ΔV与电池的老化前容量ΔQ0或电池的老化后容量ΔQ成正比例的特性,可以在只建立出厂SOC-OCV关系的前提下,对电池SOH做出准确估计。Specifically, the voltage variation of the cross section in the linear section of the battery SOC-OCV relationship and the linear section of the DCIR-SOC relationship, that is, the variation voltage ΔV is proportional to the pre-aging capacity ΔQ 0 of the battery or the aging capacity ΔQ of the battery, The battery SOH can be accurately estimated on the premise that only the factory SOC-OCV relationship is established.

因此,本发明实施例的检测电池健康状态的方法,首先确定电池的SOC处于交叉区间且电流I处于电流区间,能够在电池充电或放电过程中,获取电池老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, the method for detecting the health state of the battery in the embodiment of the present invention first determines that the SOC of the battery is in the intersection interval and the current I is in the current interval, and can obtain the capacity before the battery aging and the aging capacity of the battery during the charging or discharging process of the battery. Thereby accurately estimating the battery SOH.

可选地,电池为铅酸电池或镍镉电池或镍氢电池或锂离子二次电池。Alternatively, the battery is a lead acid battery or a nickel cadmium battery or a nickel hydride battery or a lithium ion secondary battery.

还应理解,本发明实施例中的电池还可以拓展至电池组,还可在BMS上进行一些改进,比如设定电子开关,将电池组中的部分模组或单体电池进行分时隔离,并采用本发明实施例的检测电池健康状态的方法逐一对电池SOH进行判断,识别过早老化电池,以便于提前预警或更换。It should also be understood that the battery in the embodiment of the present invention can also be extended to the battery pack, and some improvements can be made on the BMS, such as setting an electronic switch, and time-separating some modules or single cells in the battery pack. The method for detecting the health state of the battery according to the embodiment of the present invention is used to judge the battery SOH one by one, and the prematurely aged battery is identified to facilitate early warning or replacement.

具体地,本发明实施例的检测电池健康状态的方法可以如图2所示,该方法200可以包括:Specifically, the method for detecting the health state of the battery in the embodiment of the present invention may be as shown in FIG. 2, and the method 200 may include:

S210,判断电池SOC、电流I是否处于限定范围。S210, determining whether the battery SOC and the current I are within a limited range.

在S210中,当判断电池SOC、电流I不处于限定范围,则执行S270,结束电池SOH的在线检测;当判断电池SOC、电流I处于限定范围,则执行S220,对电流I进行时间上的积分,计算电池的老化后容量ΔQ。In S210, when it is determined that the battery SOC and the current I are not in the limited range, the process S270 is executed to end the online detection of the battery SOH; when it is determined that the battery SOC and the current I are in the limited range, S220 is performed to integrate the current I in time. Calculate the aging capacity ΔQ of the battery.

应理解,在限定范围内,电池SOC处于SOC-OCV线性区域和DCIR-SOC 的线性区域的交集,即交叉区间,该交叉区间可以根据电池的材料确定,在限定范围内,电流I处于该交叉区间对应的电流区间,上文已经对此做了详细介绍,这里不再赘述。It should be understood that within a limited range, the battery SOC is in the SOC-OCV linear region and DCIR-SOC The intersection of the linear regions, that is, the intersection interval, which can be determined according to the material of the battery. Within a limited range, the current I is in the current interval corresponding to the intersection interval, which has been described in detail above, and will not be described again here. .

应理解,判断电池SOC、电流I是否处于限定范围可以是判断电池SOC是否处于交叉区间,电流I是否处于交叉区间对应的电流区间。It should be understood that determining whether the battery SOC and the current I are within a limited range may be determining whether the battery SOC is in a cross section, and whether the current I is in a current interval corresponding to the intersection interval.

具体地,首先,可以确定电池SOC是否处于SOC-OCV关系的线性区域。对于正负极材料不同的电池,其SOC-OCV关系线性区域不同。例如,如图3所示为NCA-石墨电池的SOC-OCV关系,可以看出SOC-OCV线性区域为40%-100%SOC;其次,可以确定DCIR是否处于DCIR-SOC的线性区域。DCIR-SOC的线性区域不仅与电池类型有关,而且与充电或放电电流有关。例如,如图4所示为NCA-石墨电池的DCIR-SOC关系,当充电或放电电流在0.2C-2C之间,DCIR-SOC线性区域为30%-90%SOC。Specifically, first, it can be determined whether the battery SOC is in a linear region of the SOC-OCV relationship. For batteries with different positive and negative materials, the SOC-OCV relationship has different linear regions. For example, as shown in FIG. 3, the SOC-OCV relationship of the NCA-graphite battery shows that the SOC-OCV linear region is 40%-100% SOC. Secondly, it can be determined whether the DCIR is in the linear region of the DCIR-SOC. The linear region of the DCIR-SOC is not only related to the type of battery, but also to the charge or discharge current. For example, as shown in FIG. 4, the DCIR-SOC relationship of the NCA-graphite battery is such that the DCIR-SOC linear region is between 30% and 90% SOC when the charging or discharging current is between 0.2 C and 2 C.

应理解,对于NCA-石墨电池来说,同时满足SOC-OCV关系与DCIR-SOC关系的具有线性关系的交叉部分的SOC为40%-90%,交叉部分对应的电流I为0.2C-2C,因此,本发明实施例的技术方案在该交叉区间内实施。It should be understood that for the NCA-graphite battery, the SOC of the cross portion having a linear relationship satisfying the SOC-OCV relationship and the DCIR-SOC relationship is 40%-90%, and the current I corresponding to the intersection portion is 0.2C-2C. Therefore, the technical solution of the embodiment of the present invention is implemented in the intersection interval.

应理解,SOC-OCV关系和DCIR-SOC关系可以是出厂电池SOC-OCV关系和出厂电池DCIR-SOC关系。It should be understood that the SOC-OCV relationship and the DCIR-SOC relationship may be the factory battery SOC-OCV relationship and the factory battery DCIR-SOC relationship.

具体地,当启动SOH诊断程序时,时间计为t1,SOC计为SOC1,电流计为I1,端电压计为Vt1。如果在线判断电池SOC和电流I处于该交叉区域,例如对于NCA-石墨电池,若40%≤SOC1≤90%,0.2C≤I1≤2C,则对接下来的充电或放电过程的电流进行积分,否则,结束SOH诊断流程。Specifically, when the SOH diagnostic program is started, the time is t 1 , the SOC is SOC 1 , the ammeter is I 1 , and the terminal voltmeter is V t1 . If the line is determined SOC of the battery and the current I in the intersection region, for example, graphite NCA- battery, if 40% ≤SOC 1 ≤90%, 0.2C≤I 1 ≤2C, next to the charging current or discharging process integrates Otherwise, the SOH diagnostic process ends.

S220,对充电或放电过程中的电流进行积分,计算电池的老化后容量ΔQ。S220, integrating the current during charging or discharging, and calculating the aging capacity ΔQ of the battery.

应理解,在S220中,若判断电池SOC、电流I处于限定范围,则对电池进行充电或放电,并且对充电或放电过程中的电流进行积分,计算电池的老化后容量ΔQ。It should be understood that, in S220, if it is determined that the battery SOC and the current I are within a limited range, the battery is charged or discharged, and the current during charging or discharging is integrated, and the aging capacity ΔQ of the battery is calculated.

S230,判断电池SOC和电流I是否处于限定范围。S230, determining whether the battery SOC and the current I are within a limited range.

在S230中,在电池充电或放电Δt时间之后,判断电池SOC、电流I是否还处于限定范围,该限定范围与S210中限定范围相同,这里不再赘述。In S230, after the battery charging or discharging Δt time, it is determined whether the battery SOC and the current I are still in a limited range, and the limited range is the same as the limited range in S210, and details are not described herein again.

S240,若电池SOC和电流I处于限定范围,确定电池的老化后容量ΔQ 和变化电压ΔV。S240, if the battery SOC and current I are in a limited range, determine the aging capacity ΔQ of the battery And change voltage ΔV.

应理解,在启动SOH诊断程序,并电池经充电或放电Δt后,时间计为t2,SOC计为SOC2,电流计为I2,端电压计为Vt2。此时,若SOC2和I2仍处于交叉区间,例如,NCA-石墨电池,即为若满足SOC-OCV与DCIR-SOC具有线性关系的交叉部分,即40%≤SOC2≤90%,0.2C≤I2≤2C,则终止对电流I进行积分,同时确定电池的老化后容量ΔQ和变化电压ΔV。否则执行S270,结束SOH的在线检测。It should be understood that after the SOH diagnostic procedure is initiated and the battery is charged or discharged Δt, the time is t 2 , the SOC is SOC 2 , the galvanometer is I 2 , and the terminal voltmeter is V t2 . At this time, if SOC 2 and I 2 are still in the intersection interval, for example, NCA-graphite battery, that is, if the SOC-OCV and the DCIR-SOC have a linear relationship, that is, 40% ≤ SOC 2 ≤ 90%, 0.2 When C ≤ I 2 ≤ 2C, the integration of the current I is terminated, and the aging capacity ΔQ and the variation voltage ΔV of the battery are determined. Otherwise, S270 is executed to end the online detection of the SOH.

应理解,终止对电流I进行积分的同时,可以结束电池的充电或放电过程,也可以不结束电池的充电或放电过程,本发明实施例对此不做任何限制。It should be understood that the charging or discharging process of the battery may be terminated while the current I is being integrated, and the charging or discharging process of the battery may not be terminated.

其中,电池的老化后容量ΔQ,变化电压ΔV可以分别由以下公式(1)和公式(2)确定:Wherein, the aging capacity ΔQ of the battery and the variation voltage ΔV can be determined by the following formulas (1) and (2), respectively:

Figure PCTCN2016108829-appb-000003
Figure PCTCN2016108829-appb-000003

Figure PCTCN2016108829-appb-000004
Figure PCTCN2016108829-appb-000004

S250,根据变化电压ΔV,确定对应的电池的老化前容量ΔQ0S250, determining a pre-aging capacity ΔQ 0 of the corresponding battery according to the variation voltage ΔV.

在S250中,根据变化电压ΔV,可以从出厂电池SOC-OCV关系中查找对应的电池的老化前容量ΔQ0In S250, based on the varying voltage ΔV, the pre-aging capacity ΔQ 0 of the corresponding battery can be found from the factory battery SOC-OCV relationship.

应理解,在线检测的Vt1,Vt2与电池OCV之间可以存在以下关系,如公式(3)和公式(4):It should be understood that there may be the following relationship between V t1 , V t2 and the battery OCV detected online, such as formula (3) and formula (4):

Vt1=OCV1-I1RDCI             (3)V t1 =OCV 1 -I 1 R DCI (3)

Vt2=OCV2-I2RDCI              (4)V t2 =OCV 2 -I 2 R DCI (4)

其中,RDCI为电池内阻,OCV1为充电或放电起始时刻的OCV,OCV2为充电或放电过程中终止电流积分时刻的OCV。Wherein, R DCI is the internal resistance of the battery, OCV 1 is the OCV of the charging or discharging start time, and OCV 2 is the OCV of the time when the current integration is terminated during charging or discharging.

应理解,在公式(3)、(4)中,当电池放电时,电流I取正,当电池充电时,电流I取负。It should be understood that in equations (3), (4), when the battery is discharged, the current I is positive, and when the battery is charged, the current I is taken negative.

在上述确定的限定范围内,保证了SOC-OCV与DCIR-SOC均存在线性关系,对于公式(3)和公式(4)可知,当I1=I2时,可以获得如下关系,如公式(5):Within the above-defined range, it is guaranteed that there is a linear relationship between SOC-OCV and DCIR-SOC. For equations (3) and (4), when I 1 = I 2 , the following relationship can be obtained, such as the formula ( 5):

Figure PCTCN2016108829-appb-000005
Figure PCTCN2016108829-appb-000005

因此,可直接从出厂电池SOC-OCV关系中得到电池的老化前容量ΔQ0,具体方法如下:在满足上述交叉区域内的出厂电池SOC-OCV关系上,如图5所示,任意截取与变化电压ΔV相等的ΔOCV,并根据该段对应的ΔSOC0 计算出电池的老化前容量ΔQ0,ΔQ0=Q0×ΔSOC0,其中,Q0为电池出厂时的初始容量。Therefore, the pre-aging capacity ΔQ 0 of the battery can be directly obtained from the SOC-OCV relationship of the factory battery, and the specific method is as follows: on the relationship of the SOC-OCV of the factory battery in the above-mentioned intersection area, as shown in FIG. 5, arbitrary interception and change The voltage ΔV is equal to ΔOCV, and the pre-aging capacity ΔQ 0 , ΔQ 0 = Q 0 × ΔSOC 0 of the battery is calculated according to the corresponding ΔSOC 0 of the segment, where Q 0 is the initial capacity of the battery when it leaves the factory.

应理解,出厂电池SOC-OCV关系很容易在电池装配之前获取,并预埋入电池管理系统中。It should be understood that the factory battery SOC-OCV relationship is easily acquired prior to battery assembly and pre-embedded into the battery management system.

还应理解,由于在线性区域内,电池老化前与老化后的SOC-OCV关系是一致的,还可以从老化后的SOC-OCV关系上,得到电池的老化前容量ΔQ0It should also be understood that since the SOC-OCV relationship between the battery before aging and the aging is consistent in the linear region, the pre-aging capacity ΔQ 0 of the battery can also be obtained from the SOC-OCV relationship after aging.

S260,计算并更新当前的SOH。S260, calculating and updating the current SOH.

在S260中,电池当前SOH可由以下公式(6)计算:In S260, the current SOH of the battery can be calculated by the following formula (6):

Figure PCTCN2016108829-appb-000006
Figure PCTCN2016108829-appb-000006

S270,结束。S270, the end.

应理解,若在S210和S230中判断电池SOC、电流I不处于限定范围,则结束对电池SOH的在线检测。It should be understood that if it is determined in S210 and S230 that the battery SOC and the current I are not within the limited range, the online detection of the battery SOH is ended.

因此,本发明实施例的检测电池健康状态的方法,首先确定电池的SOC处于交叉区间且电流I处于电流区间内,能够在电池充电或放电过程中,获取电池的老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, the method for detecting the health state of the battery in the embodiment of the present invention first determines that the SOC of the battery is in the intersection interval and the current I is in the current interval, and can obtain the capacity before the battery and the aging of the battery during the charging or discharging process of the battery. Capacity to accurately estimate battery SOH.

上述图1和图2详细的描述了本发明实施例的检测电池健康状态的方法,下面将介绍本发明实施例的检测电池健康状态的装置和电池管理系统。The above FIG. 1 and FIG. 2 describe in detail the method for detecting the health state of the battery according to the embodiment of the present invention. Hereinafter, the device for detecting the health state of the battery and the battery management system according to the embodiment of the present invention will be described.

图6是本发明实施例的检测电池健康状态的装置的示意图。如图6所示,装置300包括:6 is a schematic diagram of an apparatus for detecting a health status of a battery according to an embodiment of the present invention. As shown in FIG. 6, the apparatus 300 includes:

判断单元310,用于判断电池的当前SOC是否处于电池的SOC-OCV关系的线性区间和DCIR-SOC关系的线性区间的交叉区间,并判断电池的当前电流是否处于交叉区间对应的电流区间。The determining unit 310 is configured to determine whether the current SOC of the battery is in a cross section of a linear interval of a SOC-OCV relationship of the battery and a linear section of a DCIR-SOC relationship, and determine whether the current current of the battery is in a current interval corresponding to the intersection interval.

充放电单元320,用于判断单元310判断若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电。The charging and discharging unit 320 is configured to determine, by the determining unit 310, that the battery is charged or discharged if the current SOC is in the intersection interval and the current current is in the current interval.

数据处理单元330,用于确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ;根据变化电压ΔV,确定电池的老化前容量ΔQ0;根据电池的老化前容量ΔQ0和老化后容量ΔQ,确定电池健康状态SOH。The data processing unit 330, after aging for determining the change in voltage [Delta] V and the battery charge or discharge capacity [Delta] Q; change according to the voltage [Delta] V, the battery is determined before aging capacity ΔQ 0; The capacity of the battery before aging and after aging ΔQ 0 The capacity ΔQ determines the battery health state SOH.

应理解,SOC-OCV和DCIR-SOC的交叉区间如上述,这里不再赘述It should be understood that the intersection interval of SOC-OCV and DCIR-SOC is as described above, and will not be described here.

可选地,该装置300还可以包括:Optionally, the apparatus 300 may further include:

存储单元340,用于预先存储电池SOC-OCV关系、电池DCIR-SOC关 系和电池SOH等。The storage unit 340 is configured to pre-store the battery SOC-OCV relationship and the battery DCIR-SOC And battery SOH and so on.

应理解,存储单元340,还可以用于存储交叉区间内的电流区间。It should be understood that the storage unit 340 can also be used to store current intervals within the intersection interval.

检测单元350,用于在线检测电池的电压V、电流I、充电或放电时间Δt等。The detecting unit 350 is configured to detect the voltage V, the current I, the charging or discharging time Δt, and the like of the battery on-line.

可选地,数据处理单元330还用于,在充放电单元320对电池充电或放电Δt时间后,判断单元310判断若电池充电或放电后SOC处于交叉区间且充电或放电后电流I处于电流区间,则确定充电或放电过程中的变化电压ΔV,并对充电或放电过程中的电流进行积分以确定电池的老化后容量ΔQ。Optionally, the data processing unit 330 is further configured to: after the charging/discharging unit 320 charges or discharges the battery for Δt time, the determining unit 310 determines that the SOC is in a cross section after the battery is charged or discharged, and the current I is in a current interval after charging or discharging. Then, the varying voltage ΔV during charging or discharging is determined, and the current during charging or discharging is integrated to determine the aging capacity ΔQ of the battery.

可选地,数据处理单元330还用于:根据出厂电池SOC-OCV关系,确定变化电压ΔV对应的电池的老化前容量ΔQ0Optionally, the data processing unit 330 is further configured to: determine, according to the factory battery SOC-OCV relationship, the pre-aging capacity ΔQ 0 of the battery corresponding to the variation voltage ΔV.

可选地,当电池的正极为三元材料,负极为石墨时,交叉区间内的SOC为40%-90%,且电流区间内电流I为0.2C-2C。Alternatively, when the positive electrode of the battery is a ternary material and the negative electrode is graphite, the SOC in the cross section is 40%-90%, and the current I in the current interval is 0.2 C-2C.

可选地,电池为铅酸电池或镍镉电池或镍氢电池或锂离子二次电池。Alternatively, the battery is a lead acid battery or a nickel cadmium battery or a nickel hydride battery or a lithium ion secondary battery.

应理解,这里的装置300以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(Application Specific Integrated Circuit,简称“ASIC”)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中,本领域技术人员可以理解,装置300可以用于执行上述方法实施例对应的各个流程和/或步骤,为避免重复,在此不再赘述。It should be understood that the apparatus 300 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an application specific integrated circuit ("ASIC"), an electronic circuit, a processor for executing one or more software or firmware programs (eg, a shared processor, proprietary processing). Or a group processor, etc.) and memory, merge logic, and/or other suitable components that support the described functionality. In an alternative example, those skilled in the art may understand that the apparatus 300 may be used to perform various processes and/or steps corresponding to the foregoing method embodiments. To avoid repetition, details are not described herein again.

因此,本发明实施例的检测电池健康状态的装置,首先确定电池的SOC处于交叉区间且电流I处于电流区间内,能够在电池充电或放电过程中,获取电池的老化前容量和电池的老化后容量,从而准确估算电池SOH。Therefore, the apparatus for detecting the health of the battery in the embodiment of the present invention first determines that the SOC of the battery is in the intersection interval and the current I is in the current interval, and can obtain the pre-aging capacity of the battery and the aging of the battery during charging or discharging of the battery. Capacity to accurately estimate battery SOH.

图7是本发明实施例的检测电池健康状态的另一装置300。如图7所示,该装置400可以包括处理器410,处理器410用于执行指令,指令包括:Figure 7 is another apparatus 300 for detecting the health of a battery in accordance with an embodiment of the present invention. As shown in FIG. 7, the apparatus 400 can include a processor 410, where the processor 410 is configured to execute instructions, where the instructions include:

判断电池的当前荷电状态SOC是否处于电池的SOC-开路电压OCV关系的线性区间和直流内阻DCIR-SOC关系的线性区间的交叉区间,并判断电池的当前电流是否处于与交叉区间对应的电流区间;Determining whether the current state of charge SOC of the battery is in the intersection of the linear interval of the SOC-open circuit voltage OCV relationship of the battery and the linear interval of the direct current resistance DCIR-SOC relationship, and determining whether the current current of the battery is in a current corresponding to the intersection interval Interval

若当前SOC处于交叉区间且当前电流处于电流区间,则对电池进行充电或放电,并确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ; If the current SOC is in the intersection interval and the current current is in the current interval, charging or discharging the battery, and determining the changing voltage ΔV during charging or discharging and the aging capacity ΔQ of the battery;

根据变化电压ΔV,确定电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;

根据电池的老化前容量ΔQ0和电池的老化后容量ΔQ,确定电池健康状态SOH。The battery health state SOH is determined based on the pre-aged capacity ΔQ 0 of the battery and the post-aged capacity ΔQ of the battery.

可选地,处理器410还用于对电池充电或放电Δt时间后,若电池充电或放电后SOC处于交叉区间且充电或放电后电流I处于电流区间,则确定充电或放电过程中的变化电压ΔV,并对充电或放电过程中的电流进行积分以确定电池的老化后容量ΔQ。Optionally, the processor 410 is further configured to: after charging or discharging the battery for Δt time, if the SOC is in a cross section after the battery is charged or discharged, and the current I is in a current interval after charging or discharging, determining a changing voltage during charging or discharging ΔV, and integrates the current during charging or discharging to determine the post-aging capacity ΔQ of the battery.

可选地,处理器410还用于根据出厂电池SOC-OCV关系,确定变化电压ΔV对应的电池的老化前容量ΔQ0Optionally, the processor 410 is further configured to determine, according to the factory battery SOC-OCV relationship, the pre-aging capacity ΔQ 0 of the battery corresponding to the variation voltage ΔV.

另外,该装置400还可以包括存储器420,存储器420可用于存储指令等。处理器410可以是基带处理器,通信处理器,数字信号处理器,或者专用集成电路等。处理器410用于执行存储器430所存储的指令。Additionally, the apparatus 400 can also include a memory 420 that can be used to store instructions and the like. Processor 410 can be a baseband processor, a communications processor, a digital signal processor, or an application specific integrated circuit or the like. The processor 410 is configured to execute instructions stored by the memory 430.

应理解,装置400中的处理器410和存储器420可以通过总线系统430进行连接。It should be understood that processor 410 and memory 420 in device 400 can be connected by bus system 430.

应理解,根据本发明实施例的检测电池健康状态的装置400,可对应于执行本发明实施例中的方法,并且装置中的各个的上述和其它操作和/或功能分别为了实现图1中的各个方法的相应流程,为了简洁,在此不再赘述。It should be understood that the apparatus 400 for detecting the health of a battery according to an embodiment of the present invention may correspond to performing the method in the embodiments of the present invention, and the above and other operations and/or functions of each of the apparatuses are respectively implemented in FIG. The corresponding processes of the various methods are not described here for brevity.

图8是本发明实施例的检测电池健康状态的电池管理系统的示意图。如图8所示,该系统500包括控制单元510、充放电单元520、数据处理单元530。FIG. 8 is a schematic diagram of a battery management system for detecting a health state of a battery according to an embodiment of the present invention. As shown in FIG. 8, the system 500 includes a control unit 510, a charge and discharge unit 520, and a data processing unit 530.

控制单元510,用于判断电池当前SOC是否处于电池SOC-OCV关系的线性区间和DCIR-SOC关系的线性区间的交叉区间,且判断当前电流是否处于交叉区间对应的电流区间,并指令是否进行SOH检测。The control unit 510 is configured to determine whether the current SOC of the battery is in a cross section of a linear interval of the battery SOC-OCV relationship and a linear interval of a DCIR-SOC relationship, and determine whether the current current is in a current interval corresponding to the cross section, and instruct whether to perform SOH Detection.

还应理解,当电池当前SOC和当前电流不处于交叉区间和电流区间,则控制单元510指令结束SOH检测;当电池当前SOC和当前电流I分别处于交叉区间和电流区间,则控制单元510指令继续进行下一步SOH检测。It should also be understood that when the current SOC and current current of the battery are not in the intersection interval and the current interval, the control unit 510 instructs to end the SOH detection; when the current SOC of the battery and the current current I are in the intersection interval and the current interval, respectively, the control unit 510 instructs to continue. Perform the next SOH test.

充放电单元520,用于控制单元510判断若电池当前SOC和当前电流分别处于交叉区间和电流区间,则对电池进行充电或放电。The charging and discharging unit 520 is configured to control the unit 510 to determine whether the battery is charged or discharged if the current SOC and the current current of the battery are in the intersection interval and the current interval, respectively.

数据处理单元530,用于确定充电或放电过程中的变化电压ΔV和电池的老化后容量ΔQ;根据变化电压ΔV,确定电池的老化前容量ΔQ0;根据电池的老化前容量ΔQ0和老化后容量ΔQ,确定电池健康状态SOH。 The data processing unit 530 for determining the aging change in the voltage [Delta] V and the battery charge or discharge capacity [Delta] Q; change according to the voltage [Delta] V, the battery is determined before aging capacity ΔQ 0; The capacity of the battery before aging and after aging ΔQ 0 The capacity ΔQ determines the battery health state SOH.

可选地,数据处理单元530,还用于充放电单元520对电池充电或放电Δt时间后,控制单元510判断若电池充电或放电后SOC处于交叉区间且充电或放电后电流I处于电流区间,则确定充电或放电过程中的变化电压ΔV和对电流I进行积分得到的电池的老化后容量ΔQ。Optionally, the data processing unit 530 is further configured to: after the charging/discharging unit 520 charges or discharges the battery for Δt time, the control unit 510 determines that if the SOC is in a cross section after charging or discharging the battery, and the current I is in a current interval after charging or discharging, Then, the change voltage ΔV during charging or discharging and the post-aging capacity ΔQ of the battery obtained by integrating the current I are determined.

可选地,数据处理单元530,还用于根据出厂电池SOC-OCV关系,确定变化电压ΔV对应的电池的老化前容量ΔQ0Optionally, the data processing unit 530 is further configured to determine, according to the factory battery SOC-OCV relationship, the pre-aging capacity ΔQ 0 of the battery corresponding to the variation voltage ΔV.

可选地,该系统500还包括检测单元540、存储单元550、电池560、负载570。Optionally, the system 500 further includes a detecting unit 540, a storage unit 550, a battery 560, and a load 570.

应理解,存储单元550,用于预先存储电池SOC-OCV关系、电池DCIR-SOC关系和电池SOH等。It should be understood that the storage unit 550 is configured to pre-store the battery SOC-OCV relationship, the battery DCIR-SOC relationship, the battery SOH, and the like.

应理解,存储单元550,还可以用于存储交叉区间对应的电流区间。It should be understood that the storage unit 550 can also be used to store the current interval corresponding to the intersection interval.

检测单元540,用于在线检测电池的电压V、电流I、充电或放电时间Δt等。The detecting unit 540 is configured to detect the voltage V, the current I, the charging or discharging time Δt, and the like of the battery on-line.

该电池560还可以为电池组560,本发明实施例对此不做限制。The battery 560 can also be a battery pack 560, which is not limited in this embodiment of the present invention.

还应理解,根据本发明实施例的检测电池健康状态的电池管理系统500,可对应于执行本发明实施例中的方法,并且系统中的各个的上述和其它操作和/或功能分别为了实现图1中的各个方法的相应流程,为了简洁,在此不再赘述。It should also be understood that the battery management system 500 for detecting the health of a battery according to an embodiment of the present invention may correspond to performing the method of the embodiments of the present invention, and the above and other operations and/or functions of each of the systems are respectively implemented in order to implement the map. The corresponding flow of each method in 1 is not repeated here for brevity.

本领域普通技术人员可以意识到,结合本文中所公开的实施例中描述的各方法步骤和单元,能够以电子硬件、计算机软件或者二者的结合来实现,为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各实施例的步骤及组成。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。本领域普通技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本申请的范围。Those skilled in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the steps and composition of the various embodiments have been generally described in terms of function in the foregoing description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. Different methods may be used to implement the described functionality for each particular application, but such implementation should not be considered to be beyond the scope of the application.

所属领域的技术人员可以清楚地了解到,为了描述的方便和简洁,上述描述的系统、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

在本申请所提供的几个实施例中,应该理解到,所揭露的系统、装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可 以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另外,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接,也可以是电的,机械的或其它的形式连接。In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division, and may be implemented in actual implementation. In a different manner, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

结合本文中所公开的实施例描述的方法或步骤可以用硬件、处理器执行的软件程序,或者二者的结合来实施。软件程序可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。The methods or steps described in connection with the embodiments disclosed herein may be implemented in hardware, a software program executed by a processor, or a combination of both. Software programs can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical fields. Any other form of storage medium known.

尽管通过参考附图并结合优选实施例的方式对本发明实施例进行了详细描述,但本发明实施例并不限于此。在不脱离本发明实施的精神和实质的前提下,本领域普通技术人员可以对本发明实施例进行各种等效的修改或替换,而这些修改或替换都应在本申请的涵盖范围内。 Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited thereto. Various equivalent modifications and alterations to the embodiments of the present invention can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

  1. 一种检测电池健康状态的方法,其特征在于,包括:A method for detecting a health status of a battery, comprising:
    判断电池的当前荷电状态SOC是否处于所述电池的SOC-开路电压OCV关系的线性区间和直流内阻DCIR-SOC关系的线性区间的交叉区间,并判断所述电池的当前电流是否处于与所述交叉区间对应的电流区间;Determining whether the current state of charge SOC of the battery is in a cross section of a linear interval of the SOC-open circuit voltage OCV relationship of the battery and a linear interval of a DC internal resistance DCIR-SOC relationship, and determining whether the current current of the battery is in the same state The current interval corresponding to the intersection interval;
    若所述当前SOC处于所述交叉区间且所述当前电流处于所述电流区间,则对所述电池进行充电或放电,并确定所述充电或放电过程中的变化电压ΔV和所述电池的老化后容量ΔQ;If the current SOC is in the intersection interval and the current current is in the current interval, charging or discharging the battery, and determining a variation voltage ΔV during the charging or discharging process and aging of the battery After capacity ΔQ;
    根据所述变化电压ΔV,确定所述电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;
    根据所述电池的老化前容量ΔQ0和所述电池的老化后容量ΔQ,确定电池健康状态SOH。The battery health state SOH is determined according to the pre-aging capacity ΔQ 0 of the battery and the post-aging capacity ΔQ of the battery.
  2. 如权利要求1所述的方法,其特征在于,所述确定所述充电或放电过程中的变化电压ΔV和所述电池的老化后容量ΔQ,包括:The method of claim 1 wherein said determining said varying voltage ΔV during said charging or discharging and said post-aging capacity ΔQ of said battery comprises:
    对所述电池充电或放电Δt时间后,若所述电池充电或放电后SOC处于所述交叉区间且充电或放电后电流处于所述电流区间,则确定所述充电或放电过程中的所述变化电压ΔV,并对所述充电或放电过程中的电流进行积分以确定所述电池的老化后容量ΔQ。After charging or discharging the battery for Δt time, if the SOC is in the intersection interval after the battery is charged or discharged and the current is in the current interval after charging or discharging, determining the change in the charging or discharging process The voltage ΔV is integrated and the current during the charging or discharging is integrated to determine the post-aging capacity ΔQ of the battery.
  3. 如权利要求1或2所述的方法,其特征在于,所述根据所述变化电压ΔV,确定所述电池的老化前容量ΔQ0,包括:The method according to claim 1 or 2, wherein the determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV comprises:
    根据出厂电池SOC-OCV关系,确定所述变化电压ΔV对应的所述电池的老化前容量ΔQ0The pre-aging capacity ΔQ 0 of the battery corresponding to the varying voltage ΔV is determined according to the factory battery SOC-OCV relationship.
  4. 如权利要求1-3任一项所述的方法,其特征在于,当所述电池的正极为三元材料,负极为石墨时,所述交叉区间内的SOC为40%-90%,且所述电流区间内的电流I为0.2C-2C。The method according to any one of claims 1 to 3, wherein when the positive electrode of the battery is a ternary material and the negative electrode is graphite, the SOC in the cross section is 40% to 90%, and The current I in the current interval is 0.2C-2C.
  5. 一种检测电池健康状态的装置,其特征在于,包括:A device for detecting a health state of a battery, comprising:
    判断单元,用于判断电池的当前荷电状态SOC是否处于所述电池的SOC-开路电压OCV关系的线性区间和直流内阻DCIR-SOC关系的线性区间的交叉区间,并判断所述电池的当前电流是否处于与所述交叉区间对应的电流区间;a determining unit, configured to determine whether a current state of charge SOC of the battery is in a cross section of a linear interval of a SOC-open circuit voltage OCV relationship of the battery and a linear interval of a DC internal resistance DCIR-SOC relationship, and determine a current state of the battery Whether the current is in a current interval corresponding to the intersection interval;
    充放电单元,用于所述判断单元判断若所述当前SOC处于所述交叉区间且所述当前电流处于所述电流区间,则对所述电池进行充电或放电; a charging and discharging unit, configured to determine, by the determining unit, that the current SOC is in the intersection interval and the current current is in the current interval, charging or discharging the battery;
    数据处理单元,用于确定所述充电或放电过程中的变化电压ΔV和所述电池的老化后容量ΔQ;a data processing unit, configured to determine a variation voltage ΔV during the charging or discharging process and an aging capacity ΔQ of the battery;
    根据所述变化电压ΔV,确定所述电池的老化前容量ΔQ0Determining the pre-aging capacity ΔQ 0 of the battery according to the varying voltage ΔV;
    根据所述电池的老化前容量ΔQ0和所述电池的老化后容量ΔQ,确定电池健康状态SOH。The battery health state SOH is determined according to the pre-aging capacity ΔQ 0 of the battery and the post-aging capacity ΔQ of the battery.
  6. 如权利要求5所述的装置,其特征在于,所述数据处理单元还用于:The device of claim 5, wherein the data processing unit is further configured to:
    所述充放电单元对所述电池充电或放电Δt时间后,所述判断单元判断若所述电池充电或放电后SOC与充电或放电后电流分别处于所述交叉区间和所述电流范围,则确定所述充电或放电过程中的所述变化电压ΔV,并对所述充电或放电过程中的电流进行积分以确定所述电池的老化后容量ΔQ。After the charging/discharging unit charges or discharges the battery for Δt time, the determining unit determines that if the SOC and the current after charging or discharging are in the intersection interval and the current range respectively after the battery is charged or discharged, it is determined The varying voltage ΔV during the charging or discharging process and integrating the current during the charging or discharging to determine the post-aging capacity ΔQ of the battery.
  7. 如权利要求5或6所述的装置,其特征在于,所述数据处理单元还用于:The device according to claim 5 or 6, wherein the data processing unit is further configured to:
    根据出厂电池SOC-OCV关系,确定所述变化电压ΔV对应的所述电池的老化前容量ΔQ0The pre-aging capacity ΔQ 0 of the battery corresponding to the varying voltage ΔV is determined according to the factory battery SOC-OCV relationship.
  8. 如权利要求5-7任一项所述的装置,其特征在于,当所述电池的正极为三元材料,负极为石墨时,所述交叉区间内SOC为40%-90%,且所述电流区间内电流I为0.2C-2C。The apparatus according to any one of claims 5-7, wherein when the positive electrode of the battery is a ternary material and the negative electrode is graphite, the SOC in the intersection interval is 40%-90%, and the The current I in the current interval is 0.2C-2C.
  9. 一种电池管理系统,其特征在于,包括如权利要求5-8中任一项所述的装置。A battery management system, comprising the apparatus of any of claims 5-8.
  10. 如权利要求9所述的电池管理系统,其特征在于,所述系统还包括电池、充放电单元和负载。 The battery management system of claim 9 wherein said system further comprises a battery, a charge and discharge unit, and a load.
PCT/CN2016/108829 2016-02-22 2016-12-07 Method and device for detecting state of health of battery, and battery management system WO2017143830A1 (en)

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