CN104714182A - Method and system for determining state-of-charge value of battery - Google Patents
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Abstract
本发明实施例公开了一种确定电池荷电状态值的方法，该方法包括：分别获得电池在充电状态下的电压-荷电状态值参考查询表以及放电状态下的电压-荷电状态值参考查询表；检测电池当前状态，并获得在静置状态下的开路电压，该状态包括充电状态和放电状态；当电池为充电状态时，根据充电状态下的电压-荷电状态值参考查询表确定开路电压所对应的值作为电池的电池荷电状态值；当电池为放电状态时，根据放电状态下的电压-荷电状态值参考查询表确定开路电压所对应的值作为电池的电池荷电状态值。本发明实施例还公开了一种确定电池荷电状态值的系统。实施本发明实施例有利于对电池荷电状态估算进行修正，达到提高电池荷电状态估算精度的目的。
The embodiment of the present invention discloses a method for determining the state of charge value of a battery. The method includes: separately obtaining a voltage-state-of-charge value reference look-up table for a battery in a charging state and a voltage-state-of-charge value reference table for a battery in a discharging state. Lookup table; detect the current state of the battery, and obtain the open circuit voltage in the static state, which includes the state of charge and the state of discharge; when the battery is in the state of charge, refer to the lookup table according to the voltage-state of charge value in the charge state The value corresponding to the open circuit voltage is used as the battery state of charge value of the battery; when the battery is in a discharge state, refer to the lookup table according to the voltage-state of charge value in the discharge state to determine the value corresponding to the open circuit voltage as the battery state of charge of the battery value. The embodiment of the invention also discloses a system for determining the state of charge value of the battery. The implementation of the embodiments of the present invention is beneficial to correcting the estimation of the state of charge of the battery, so as to achieve the purpose of improving the estimation accuracy of the state of charge of the battery.
Description
技术领域 technical field
本发明涉及电池技术领域，尤其涉及一种确定电池荷电状态值的方法和系统。 The present invention relates to the technical field of batteries, in particular to a method and system for determining a state of charge value of a battery.
背景技术 Background technique
当前常用查表修正的方法对电池荷电状态进行估算。该方法采用电池荷电状态（state of charge，SOC）与电动势（electromotive force，EMF）之间有一一对应关系，建立起电池荷电状态（SOC）与电动势（EMF）的一张二维关系表格。因此，通过测得的电动势（EMF）来查询二维表格，即可得到电池荷电状态（SOC）值。由于电动势（EMF）的获得需要电池处于绝对静态时候开路测量，测量要求较高，较难获得，因此，常常用电池的开路电压（Open circuit voltage，OCV）替代电动势（EMF）。 Currently, the table look-up correction method is commonly used to estimate the state of charge of the battery. This method uses a one-to-one correspondence between the battery state of charge (SOC) and electromotive force (EMF), and establishes a two-dimensional relationship table between the battery state of charge (SOC) and electromotive force (EMF). Therefore, by querying the two-dimensional table through the measured electromotive force (EMF), the battery state of charge (SOC) value can be obtained. Since the acquisition of electromotive force (EMF) requires open-circuit measurement when the battery is absolutely static, the measurement requirements are high and difficult to obtain. Therefore, the open circuit voltage (OCV) of the battery is often used instead of electromotive force (EMF).
该方法是电池在放电状态下，首先取不同电池荷电状态（SOC）点并分别测试得到电池静置状态下的开路电压（OCV）值，根据电池荷电状态（SOC）和开路电压（OCV）建立电压-荷电状态值参考查询表和电压-荷电状态曲线。 The method is that when the battery is in the discharge state, firstly take different battery state of charge (SOC) points and test them separately to obtain the open circuit voltage (OCV) value in the static state of the battery, according to the battery state of charge (SOC) and open circuit voltage (OCV) ) Establish voltage-state-of-charge value reference lookup table and voltage-state-of-charge curve.
发明人发现，该方法只适用于电池处于放电状态下，缺点在于：由于在没有区分电池的工作状态下建立电池的电压-荷电状态值参考查询表，当电池处于充电状态时，只能通过查询放电状态下的电压-荷电状态值参考查询表来确定电池荷电状态，从而造成电池荷电状态值估算误差。 The inventor found that this method is only applicable when the battery is in a discharging state. The disadvantage is that: since the voltage-state-of-charge value reference lookup table of the battery is established without distinguishing the working state of the battery, when the battery is in a charging state, only through Query the voltage-state-of-charge value in the discharge state to refer to the look-up table to determine the state-of-charge of the battery, resulting in an error in estimating the state-of-charge value of the battery.
发明内容 Contents of the invention
本发明实施例的目的在于提供一种确定电池荷电状态值的方法和系统，可以解决在电池荷电状态估算的查表修正过程中，由于在没有区分电池的工作状态下建立电池的电压-荷电状态值参考查询表，并通过查询该表来确定电池荷电状态，从而造成电池荷电状态值估算误差的问题。 The purpose of the embodiments of the present invention is to provide a method and system for determining the value of the battery state of charge, which can solve the problem of establishing the battery voltage - The state of charge value refers to the look-up table, and the state of charge of the battery is determined by looking up the table, which causes the problem of estimation error of the state of charge value of the battery.
为了解决上述技术问题，本发明实施例提供了一种确定电池荷电状态值的方法，所述方法包括以下步骤： In order to solve the above technical problems, an embodiment of the present invention provides a method for determining a battery state of charge value, the method comprising the following steps:
获得电池在充电状态下的电压-荷电状态值参考查询表以及放电状态下的电压-荷电状态值参考查询表； Obtain the voltage-state-of-charge value reference lookup table of the battery in the charging state and the voltage-state-of-charge value reference lookup table in the discharge state;
检测所述电池当前状态，并获得所述电池在静置状态下的开路电压，所述状态包括充电状态和放电状态； Detecting the current state of the battery, and obtaining the open circuit voltage of the battery in a resting state, the state including a charging state and a discharging state;
当所述电池当前状态为充电状态时，根据所述充电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值； When the current state of the battery is the charging state, refer to the lookup table according to the voltage-state-of-charge value in the charging state to determine the battery state-of-charge value corresponding to the open-circuit voltage as the battery state-of-charge value of the battery ;
当所述电池当前状态为放电状态时，根据所述放电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值。 When the current state of the battery is the discharge state, refer to the lookup table according to the voltage-state-of-charge value in the discharge state to determine the battery state-of-charge value corresponding to the open-circuit voltage as the battery state-of-charge value of the battery .
其中，所述获得电池在充电状态下的电压-荷电状态值参考查询表的步骤具体为： Wherein, the step of obtaining the reference lookup table of the voltage-state-of-charge value of the battery in the state of charge is specifically:
检测所述电池的荷电状态； detecting the state of charge of the battery;
当所述电池荷电状态值为0时，使所述电池开始充电； When the state of charge value of the battery is 0, start charging the battery;
在所述电池的充电过程中，分别测定所述电池静置状态下，所述电池荷电状态值每上升一数值对应的每一开路电压，直至所述电池荷电状态值为100，得到多个电池荷电状态值以及多个对应的开路电压； During the charging process of the battery, each open circuit voltage corresponding to each value of the state of charge value of the battery is measured when the battery is in a static state, until the state of charge value of the battery is 100, and more A battery state of charge value and a plurality of corresponding open circuit voltages;
根据所述多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的充电曲线，并根据所述电压-荷电状态值的充电曲线获得对应的所述电池在充电状态下的电压-荷电状态值参考查询表。 Draw a voltage-state-of-charge charging curve according to the plurality of battery state-of-charge values and a plurality of corresponding open-circuit voltages, and obtain the corresponding charging curve of the battery according to the voltage-state-of-charge value charging curve Refer to the lookup table for the voltage-state-of-charge value in the state.
其中，所述获得电池在放电状态下的电压-荷电状态值参考查询表的步骤具体为： Wherein, the step of obtaining the voltage-state-of-charge value of the battery in the discharge state with reference to the look-up table is specifically:
检测所述电池的荷电状态； detecting the state of charge of the battery;
当所述电池荷电状态值为100时，测定所述电池静置状态下的开路电压，并使所述电池开始放电； When the state of charge value of the battery is 100, measure the open circuit voltage of the battery at rest, and start discharging the battery;
在所述电池的放电过程中，分别测定所述电池静置状态下，所述电池荷电状态值每下降一数值对应的每一开路电压，直至所述电池荷电状态值为0，得到多个电池荷电状态值以及多个对应的开路电压； During the discharge process of the battery, each open-circuit voltage corresponding to each decrease in the state of charge value of the battery when the battery is in a static state is respectively measured until the state of charge value of the battery is 0, and how many A battery state of charge value and a plurality of corresponding open circuit voltages;
根据所述多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的放电曲线，并根据所述电压-荷电状态值的放电曲线获得对应的所述电池在放电状态下的电压-荷电状态值参考查询表。 Draw a voltage-state-of-charge discharge curve according to the plurality of battery state-of-charge values and a plurality of corresponding open-circuit voltages, and obtain the corresponding discharge curve of the battery according to the voltage-state-of-charge value discharge curve Refer to the lookup table for the voltage-state-of-charge value in the state.
本发明实施例还提供了一种确定电池荷电状态值的系统，所述系统包括：获取单元、检测单元、第一确定单元和第二确定单元；其中， The embodiment of the present invention also provides a system for determining the battery state of charge value, the system includes: an acquisition unit, a detection unit, a first determination unit and a second determination unit; wherein,
所述获得单元，用于分别获得电池在充电状态下的电压-荷电状态值参考查询表以及放电状态下的电压-荷电状态值参考查询表； The obtaining unit is configured to respectively obtain a voltage-state-of-charge value reference lookup table of the battery in a charging state and a voltage-state-of-charge value reference lookup table in a discharging state;
所述检测单元，用于检测所述电池当前状态，并获得所述电池在静置状态下的开路电压，所述状态包括充电状态和放电状态； The detection unit is used to detect the current state of the battery, and obtain the open circuit voltage of the battery in a resting state, the state includes a charging state and a discharging state;
所述第一确定单元，用于当所述电池当前状态为充电状态时，根据所述充电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值； The first determining unit is configured to determine the battery state of charge value corresponding to the open circuit voltage as a battery state of charge value for the battery;
所述第二确定单元，用于当所述电池当前状态为放电状态时，根据所述放电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值。 The second determination unit is configured to determine the battery state of charge value corresponding to the open circuit voltage as A battery state of charge value for the battery.
其中，所述获取单元包括：第一获取模块和第二获取模块； Wherein, the acquisition unit includes: a first acquisition module and a second acquisition module;
所述第一获取模块，用于检测所述电池的荷电状态；当所述电池荷电状态值为0时，使所述电池开始充电；在所述电池的充电过程中，分别测定所述电池静置状态下，所述电池荷电状态值每上升一数值对应的每一开路电压，直至所述电池荷电状态值为100，得到多个电池荷电状态值以及多个对应的开路电压；根据所述多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的充电曲线，并根据所述电压-荷电状态值的充电曲线获得对应的所述电池在充电状态下的电压-荷电状态值参考查询表； The first acquisition module is used to detect the state of charge of the battery; when the value of the state of charge of the battery is 0, start charging the battery; during the charging process of the battery, measure the When the battery is in a static state, each open-circuit voltage corresponding to each increase of the battery state of charge value by one value, until the battery state of charge value is 100, multiple battery state of charge values and multiple corresponding open circuit voltages are obtained ; draw a voltage-state-of-charge charging curve according to the multiple battery state-of-charge values and multiple corresponding open-circuit voltages, and obtain the corresponding charging curve of the battery according to the voltage-state-of-charge value Refer to the lookup table for the voltage-state-of-charge value in the charging state;
所述第二获取模块，用于检测所述电池的荷电状态；当所述电池荷电状态值为100时，测定所述电池静置状态下的开路电压，并使所述电池开始放电；在所述电池的放电过程中，分别测定所述电池静置状态下，所述电池荷电状态值每下降一数值对应的每一开路电压，直至所述电池荷电状态值为0，得到多个电池荷电状态值以及多个对应的开路电压；根据所述多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的放电曲线，并根据所述电压-荷电状态值的放电曲线获得对应的所述电池在放电状态下的电压-荷电状态值参考查询表。 The second acquisition module is configured to detect the state of charge of the battery; when the value of the state of charge of the battery is 100, measure the open circuit voltage of the battery in a resting state, and start discharging the battery; During the discharge process of the battery, each open-circuit voltage corresponding to each decrease in the state of charge value of the battery when the battery is in a static state is respectively measured until the state of charge value of the battery is 0, and how many A battery state of charge value and a plurality of corresponding open circuit voltages; according to the plurality of battery state of charge values and a plurality of corresponding open circuit voltages, draw a discharge curve of voltage-state of charge value, and according to the voltage-charge value The discharge curve of the state of charge value obtains the corresponding voltage-state of charge value of the battery in the discharge state by referring to the lookup table.
在本发明实施例中，用查表修正的方法对电池荷电状态进行估算时，分别获得电池在充电状态下和放电状态下的电压-荷电状态值参考查询表，之后判别电池的当前状态，并根据电池的状态以及电池在静置状态下所测定的开路电压，查询电池相应状态下的电压-荷电状态值参考查询表来确定对应的电池荷电状态值。实施本发明实施例，有利于对电池荷电状态估算进行修正，达到提高电池荷电状态估算精度的目的。 In the embodiment of the present invention, when using the look-up table correction method to estimate the state of charge of the battery, the voltage-state-of-charge values of the battery in the charging state and the discharging state are respectively obtained with reference to the look-up table, and then the current state of the battery is judged , and according to the state of the battery and the open circuit voltage measured in the resting state of the battery, query the voltage-state-of-charge value of the battery in the corresponding state and refer to the look-up table to determine the corresponding battery state-of-charge value. The implementation of the embodiments of the present invention is beneficial to correcting the estimation of the state of charge of the battery, so as to achieve the purpose of improving the estimation accuracy of the state of charge of the battery.
附图说明 Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，根据这些附图获得其他的附图仍属于本发明的范畴。 In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, obtaining other drawings based on these drawings still belongs to the scope of the present invention without any creative effort.
图1为电池充放电过程的OCV-SOC的曲线分布图； Fig. 1 is a curve distribution diagram of OCV-SOC in the charging and discharging process of the battery;
图2为电池充放电过程的OCV差异的曲线分布图； Figure 2 is a curve distribution diagram of the OCV difference in the charging and discharging process of the battery;
图3为本发明实施例提供的确定电池荷电状态值的方法的流程图； FIG. 3 is a flowchart of a method for determining a battery state of charge value provided by an embodiment of the present invention;
图4为本发明实施例提供的确定电池荷电状态值的系统的结构示意图； FIG. 4 is a schematic structural diagram of a system for determining a battery state of charge value provided by an embodiment of the present invention;
图5为图4中获取单元的结构示意图。 FIG. 5 is a schematic structural diagram of the acquisition unit in FIG. 4 .
具体实施方式 Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。 In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
在常用查表修正的方法中的二维关系表格通常是在没有区分电池的工作状态（是充电状态还是放电状态）下建立起来的，因此查询时也就没有区分电池的工作状态，从而造成电池荷电状态估算存在误差。该方法的缺点在于：其一，因为该表的获得方法采用的是通过放电依次获得各个电池荷电状态（SOC）值及其相应的开路电压（OCV），而忽略了如果电池在充电状态下，获得的各个电池荷电状态（SOC）值对应的开路电压（OCV），所以在相同电池荷电状态（SOC）值时，电池的两种工作状态所对应的开路电压（OCV）存在差异，这种差异现象称作“充放电滞回现象”，如图1所示，其中，曲线1为充电状态，曲线2为放电状态；其二，因为在查表前也没有区分电池的工作状态，所以获取的电池荷电状态存在误差，例如：通过查表可以发现在同一电池荷电状态（SOC）值对应的开路电压（OCV）最大可以相差17mv，如图2所示。 The two-dimensional relational table in the commonly used look-up table correction method is usually established without distinguishing the working state of the battery (whether it is a charging state or a discharging state), so the working state of the battery is not distinguished when querying, resulting in battery failure. There is an error in the state of charge estimation. The disadvantages of this method are: First, because the table is obtained by sequentially obtaining each battery state of charge (SOC) value and its corresponding open circuit voltage (OCV) through discharge, while ignoring if the battery is in the state of charge , the obtained open circuit voltage (OCV) corresponding to each battery state of charge (SOC) value, so when the battery state of charge (SOC) value is the same, the open circuit voltage (OCV) corresponding to the two working states of the battery is different, This difference phenomenon is called "charging and discharging hysteresis phenomenon", as shown in Figure 1, in which, curve 1 is the charging state, and curve 2 is the discharging state; second, because the working state of the battery is not distinguished before the table look-up, Therefore, there is an error in the obtained battery state of charge. For example, by looking up the table, it can be found that the open circuit voltage (OCV) corresponding to the same battery state of charge (SOC) value can differ by a maximum of 17mv, as shown in Figure 2.
因此在本发明实施例中，提出一种确定电池荷电状态值的方法，如图3所示，所述方法包括以下步骤： Therefore, in an embodiment of the present invention, a method for determining the battery state of charge value is proposed, as shown in FIG. 3 , the method includes the following steps:
步骤S301、获得电池在充电状态下的电压-荷电状态值参考查询表以及放电状态下的电压-荷电状态值参考查询表； Step S301. Obtain the voltage-state-of-charge value reference lookup table of the battery in the charging state and the voltage-state-of-charge value reference lookup table in the discharging state;
用查表修正的方法对电池荷电状态进行估算时，获得电池在充电状态下和放电状态下的电压-荷电状态值参考查询表。 When estimating the state of charge of the battery with the method of look-up table correction, the voltage-state-of-charge value of the battery in the charging state and the discharging state is obtained with reference to the look-up table.
在获得在充电状态下的电压-荷电状态值参考查询表的过程中，首先检测电池的荷电状态，当电池荷电状态值为0时（即SOC为0%），使电池开始充电；其次，在电池的充电过程中，分别测定电池静置状态下，电池荷电状态值每上升一数值对应的每一开路电压，直至电池荷电状态值为100（即SOC为100%），得到多个电池荷电状态值以及多个对应的开路电压；最后，根据这些多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的充电曲线，并根据电压-荷电状态值的充电曲线获得对应的电池在充电状态下的电压-荷电状态值参考查询表。其中，数值为正数，可以为固定数值，也可以选择变化的数值，但是数值的大小不能超过10，且越小越好。 In the process of obtaining the voltage-state-of-charge value reference lookup table in the charging state, first detect the state-of-charge of the battery, and start charging the battery when the state-of-charge value of the battery is 0 (that is, the SOC is 0%); Secondly, during the charging process of the battery, each open circuit voltage corresponding to each increase in the battery state of charge value is measured separately under the static state of the battery until the battery state of charge value is 100 (that is, the SOC is 100%), and the obtained A plurality of battery state of charge values and a plurality of corresponding open circuit voltages; finally, according to these plurality of battery state of charge values and a plurality of corresponding open circuit voltages, a charging curve of voltage-state of charge value is drawn, and according to the voltage-charge For the charging curve of the state of charge value, the voltage-state of charge value of the corresponding battery in the state of charge is obtained by referring to the lookup table. Wherein, the value is a positive number, which can be a fixed value or a variable value, but the value cannot exceed 10, and the smaller the better.
例如：步骤a、检测电池的荷电状态，当SOC为0%时，电池开始充电；步骤b、以小电流充电至某间隔的SOC1点，静置后记录OCV1值；步骤c、以小电流充电至同样间隔（或不同样间隔）的SOC2点，静置后记录OCV2值；重复上述步骤，记录SOCn和OCVn值，直到电池充满，即SOC为100%；将上述获得的所有SOC值和OCV值建立一张关联的二维参考查询表和曲线，即电池在充电状态下的电压-荷电状态值参考查询表和曲线。其中，SOC间隔点可任意选取，且越小越好。 For example: step a, check the state of charge of the battery, when the SOC is 0%, the battery starts to charge; step b, charge with a small current to the SOC 1 point at a certain interval, and record the OCV 1 value after standing still; step c, with Charge with a small current to the SOC 2 points at the same interval (or different intervals), and record the OCV 2 value after standing still; repeat the above steps, record the SOC n and OCV n values until the battery is fully charged, that is, the SOC is 100%; the above obtained All the SOC values and OCV values of the battery establish an associated two-dimensional reference lookup table and curve, that is, the voltage-state-of-charge value reference lookup table and curve of the battery in the charging state. Among them, the SOC interval point can be selected arbitrarily, and the smaller the better.
在获得在放电状态下的电压-荷电状态值参考查询表的过程中，首先检测电池的荷电状态，当电池荷电状态值为100时（即SOC为100%），测定此时电池静置状态下的开路电压，并使电池开始放电；其次，在电池的放电过程中，分别测定电池静置状态下，电池荷电状态值每下降一数值对应的每一开路电压，直至电池荷电状态值为0（即SOC为0%），得到多个电池荷电状态值以及多个对应的开路电压；最后，根据这些多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的放电曲线，并根据电压-荷电状态值的放电曲线获得对应的电池在放电状态下的电压-荷电状态值参考查询表。其中，数值为正数，可以为固定数值，也可以选择变化的数值，但是数值的大小不能超过10，且越小越好。 In the process of obtaining the voltage-state-of-charge value reference lookup table in the discharge state, the state of charge of the battery is first detected. When the state of charge of the battery is 100 (that is, the SOC is 100%), the static state of the battery The open circuit voltage in the static state, and the battery starts to discharge; secondly, in the battery discharge process, measure each open circuit voltage corresponding to each value of the battery state of charge value in the static state of the battery, until the battery is charged The state value is 0 (that is, SOC is 0%), and multiple battery state-of-charge values and multiple corresponding open-circuit voltages are obtained; finally, according to these multiple battery state-of-charge values and multiple corresponding open-circuit voltages, draw the voltage- The discharge curve of the state of charge value, and obtain the voltage-state of charge value of the corresponding battery in the discharge state according to the discharge curve of the voltage-state of charge value reference lookup table. Wherein, the value is a positive number, which can be a fixed value or a variable value, but the value cannot exceed 10, and the smaller the better.
例如：步骤a、检测电池的荷电状态，当SOC为100%时，测定此时电池静置状态下的开路电压，并使电池开始放电；步骤b、以小电流放电至某间隔的SOC1点，静置后记录OCV1值；步骤c、以小电流放电至同样间隔（或不同样间隔）的SOC2点，静置后记录OCV2值；重复上述步骤，记录SOCn和OCVn值，直到电池放电至SOC为0%；将上述获得的所有SOC值和OCV值建立一张关联的二维参考查询表和曲线，即电池在放电状态下的电压-荷电状态值参考查询表和曲线。其中，SOC间隔点也可任意选取，且越小越好。 For example: step a, check the state of charge of the battery, when the SOC is 100%, measure the open circuit voltage of the battery at rest, and start to discharge the battery; step b, discharge with a small current to a certain interval of SOC 1 point, record OCV 1 value after standing still; step c, discharge to SOC 2 points at the same interval (or different interval) with a small current, record OCV 2 value after standing still; repeat the above steps, record SOC n and OCV n value , until the battery is discharged until the SOC is 0%; all the SOC values and OCV values obtained above are used to establish an associated two-dimensional reference lookup table and curve, that is, the voltage-state-of-charge value reference lookup table and curve. Wherein, the SOC interval point can also be selected arbitrarily, and the smaller the better.
步骤S302、检测所述电池当前状态，并获得所述电池在静置状态下的开路电压，所述状态包括充电状态和放电状态。 Step S302 , detecting the current state of the battery, and obtaining the open circuit voltage of the battery in a resting state, the state including a charging state and a discharging state.
步骤S303、当所述电池当前状态为充电状态时，根据所述充电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值； Step S303. When the current state of the battery is the charging state, refer to the lookup table according to the voltage-state-of-charge value in the charging state to determine the battery state-of-charge value corresponding to the open-circuit voltage as the battery charge of the battery. electrical state value;
电池当前状态为充电状态时，根据步骤302获得的OCV值，在充电状态下的电压-荷电状态值参考查询表中查找该OCV值对应的SOC值，并将上述查找到的对应的SOC值作为当前SOC值。 When the current state of the battery is the charging state, according to the OCV value obtained in step 302, look up the SOC value corresponding to the OCV value in the voltage-state-of-charge value reference lookup table in the charging state, and use the corresponding SOC value found above as the current SOC value.
步骤S304、当所述电池当前状态为放电状态时，根据所述放电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值； Step S304. When the current state of the battery is the discharge state, refer to the lookup table according to the voltage-state-of-charge value in the discharge state to determine the battery state-of-charge value corresponding to the open-circuit voltage as the battery charge of the battery. electrical state value;
电池当前状态为放电状态时，根据步骤302获得的OCV值，在放电状态下的电压-荷电状态值参考查询表中查找该OCV值对应的SOC值，并将上述查找到的对应的SOC值作为当前SOC值。 When the current state of the battery is the discharge state, according to the OCV value obtained in step 302, the voltage-state-of-charge value in the discharge state refers to the look-up table to find the SOC value corresponding to the OCV value, and the corresponding SOC value found above as the current SOC value.
在本发明实施例中，用查表修正的方法对电池荷电状态进行估算时，分别获得电池在充电状态下和放电状态下的电压-荷电状态值参考查询表，之后判别电池的当前状态，并根据电池的状态以及电池在静置状态下所测定的开路电压，查询电池相应状态下的电压-荷电状态值参考查询表来确定对应的电池荷电状态值。实施本发明实施例，有利于对电池荷电状态估算进行修正，达到提高电池荷电状态估算精度的目的。 In the embodiment of the present invention, when using the look-up table correction method to estimate the state of charge of the battery, the voltage-state-of-charge values of the battery in the charging state and the discharging state are respectively obtained with reference to the look-up table, and then the current state of the battery is judged , and according to the state of the battery and the open circuit voltage measured in the resting state of the battery, query the voltage-state-of-charge value of the battery in the corresponding state and refer to the look-up table to determine the corresponding battery state-of-charge value. The implementation of the embodiments of the present invention is beneficial to correcting the estimation of the state of charge of the battery, so as to achieve the purpose of improving the estimation accuracy of the state of charge of the battery.
如图4所述，本发明实施例中，还提出一种确定电池荷电状态值的系统，该系统包括：获取单元410、检测单元420、第一确定单元430和第二确定单元440；其中， As shown in FIG. 4, in the embodiment of the present invention, a system for determining the state of charge of the battery is also proposed, and the system includes: an acquisition unit 410, a detection unit 420, a first determination unit 430, and a second determination unit 440; ,
获取单元410，用于获得电池在充电状态下的电压-荷电状态值参考查询表以及放电状态下的电压-荷电状态值参考查询表； An acquisition unit 410, configured to obtain a voltage-state-of-charge value reference lookup table of the battery in a charging state and a voltage-state-of-charge value reference lookup table in a discharging state;
检测单元420，用于检测电池当前状态，并获得所述电池在静置状态下的开路电压，该状态包括充电状态和放电状态； The detection unit 420 is used to detect the current state of the battery, and obtain the open circuit voltage of the battery in a static state, which state includes a charging state and a discharging state;
第一确定单元430，用于当所述电池当前状态为充电状态时，根据所述充电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值； The first determining unit 430 is configured to determine the battery state of charge value corresponding to the open circuit voltage as the state of charge according to the voltage-state of charge value in the state of charge when the current state of the battery is a state of charge. the battery state of charge value of the battery;
第二确定单元440，用于当所述电池当前状态为放电状态时，根据所述放电状态下的电压-荷电状态值参考查询表确定所述开路电压所对应的电池荷电状态值作为所述电池的电池荷电状态值。 The second determination unit 440 is configured to determine the battery state of charge value corresponding to the open circuit voltage as the battery state of charge according to the voltage-state of charge value in the discharge state when the current state of the battery is a discharge state. The battery state of charge value of the battery.
更进一步的，所述获取单元410包括：第一获取模块4101和第二获取模块4102； Furthermore, the acquisition unit 410 includes: a first acquisition module 4101 and a second acquisition module 4102;
第一获取模块4101，用于检测电池的荷电状态；当电池荷电状态值为0时，使电池开始充电；在电池的充电过程中，分别测定电池静置状态下，电池荷电状态值每上升一数值对应的每一开路电压，直至电池荷电状态值为100，得到多个电池荷电状态值以及多个对应的开路电压；根据所述多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的充电曲线，并根据电压-荷电状态值的充电曲线获得对应的电池在充电状态下的电压-荷电状态值参考查询表； The first acquisition module 4101 is used to detect the state of charge of the battery; when the value of the state of charge of the battery is 0, the battery starts to charge; during the charging process of the battery, the value of the state of charge of the battery is respectively measured when the battery is in a static state Each open circuit voltage corresponding to a numerical value increases until the battery state of charge value is 100, and multiple battery state of charge values and multiple corresponding open circuit voltages are obtained; according to the multiple battery state of charge values and multiple corresponding open circuit voltage, draw the charging curve of the voltage-state of charge value, and obtain the voltage-state of charge value reference lookup table of the corresponding battery in the charging state according to the charging curve of the voltage-state of charge value;
第二获取模块4102，用于检测电池的荷电状态；当电池荷电状态值为100时，测定电池静置状态下的开路电压，并使电池开始放电；在电池的放电过程中，分别测定电池静置状态下，电池荷电状态值每下降一数值对应的每一开路电压，直至电池荷电状态值为0，得到多个电池荷电状态值以及多个对应的开路电压；根据所述多个电池荷电状态值以及多个对应的开路电压，绘制电压-荷电状态值的放电曲线，并根据电压-荷电状态值的放电曲线获得对应的电池在放电状态下的电压-荷电状态值参考查询表。 The second acquisition module 4102 is used to detect the state of charge of the battery; when the value of the state of charge of the battery is 100, measure the open circuit voltage of the battery in a static state, and start the battery to discharge; during the discharge process of the battery, respectively measure When the battery is in a static state, each open-circuit voltage corresponding to the battery state-of-charge value drops by one value until the battery state-of-charge value is 0, and multiple battery state-of-charge values and multiple corresponding open-circuit voltages are obtained; according to the Multiple battery state of charge values and multiple corresponding open circuit voltages, draw the discharge curve of the voltage-state of charge value, and obtain the corresponding voltage-charge of the battery in the discharge state according to the discharge curve of the voltage-state of charge value The status value refers to the lookup table.
在本发明实施例中，确定电池荷电状态值的系统首先在获取单元410中获得电池在充电状态下的电压-荷电状态值参考查询表以及放电状态下的电压-荷电状态值参考查询表；其次通过检测单元420检测电池当前状态，确定其当前状态，并获得电池在静置状态下的开路电压；然后判别电池当前状态，当电池当前状态为充电状态时，在第一确定单元430中根据充电状态下的电压-荷电状态值参考查询表确定该开路电压所对应的电池荷电状态值作为电池的电池荷电状态值，否则，在第二确定单元440中根据放电状态下的电压-荷电状态值参考查询表确定开路电压所对应的电池荷电状态值作为电池的电池荷电状态值。 In the embodiment of the present invention, the system for determining the state of charge value of the battery first obtains the voltage-state-of-charge value reference lookup table of the battery in the charging state and the voltage-state-of-charge value reference lookup table in the discharging state in the acquisition unit 410 secondly, detect the current state of the battery by the detection unit 420, determine its current state, and obtain the open circuit voltage of the battery in a resting state; then judge the current state of the battery, and when the current state of the battery is a charging state, in the first determination unit 430 According to the voltage-state-of-charge value in the charging state, refer to the look-up table to determine the battery state-of-charge value corresponding to the open-circuit voltage as the battery state-of-charge value of the battery; otherwise, in the second determining unit 440, according to the state-of-charge value The voltage-state-of-charge value refers to the look-up table to determine the battery state-of-charge value corresponding to the open-circuit voltage as the battery state-of-charge value of the battery.
值得注意的是，上述系统实施例中，所包括的各个系统单元只是按照功能逻辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；另外，各功能单元的具体名称也只是为了便于相互区分，并不用于限制本发明的保护范围。 It is worth noting that in the above system embodiments, the system units included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific functions of each functional unit The names are only for the convenience of distinguishing each other, and are not used to limit the protection scope of the present invention.
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，所述的程序可以存储于一计算机可读取存储介质中，所述的存储介质，如ROM/RAM、磁盘、光盘等。 Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage Media such as ROM/RAM, magnetic disk, optical disk, etc.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。 The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.
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| CN (1) | CN104714182A (en) |
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| CN106405421A (en) * | 2015-07-27 | 2017-02-15 | 中兴通讯股份有限公司 | Battery state-of-charge (SOC) value evaluation method and device |
| CN106707187A (en) * | 2016-12-26 | 2017-05-24 | 宁德时代新能源科技股份有限公司 | Method and device for determining target SOC of battery |
| CN106802394A (en) * | 2017-02-06 | 2017-06-06 | 清华大学深圳研究生院 | The modification method and device of automobile batteries state-of-charge |
| CN107064814A (en) * | 2017-03-22 | 2017-08-18 | 北京长城华冠汽车科技股份有限公司 | A kind of method for transformation and device of charge states of lithium ion battery curve |
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| CN109856542A (en) * | 2018-10-23 | 2019-06-07 | 许继集团有限公司 | A kind of scaling method of lithium battery SOC-OCV set of curves, SOC bearing calibration and device |
| CN110031768A (en) * | 2019-03-26 | 2019-07-19 | 清华大学 | Lithium ion battery can electricity capacity determine that method and state of charge determine method |
| CN110927580A (en) * | 2019-11-05 | 2020-03-27 | 深圳市科陆电子科技股份有限公司 | SOC deviation correction method, device, terminal and storage medium |
| CN111416398A (en) * | 2019-01-08 | 2020-07-14 | 太普动力新能源(常熟)股份有限公司 | Method for processing relative state of charge of rechargeable battery |
| CN111929603A (en) * | 2020-07-14 | 2020-11-13 | 东风时代(武汉)电池系统有限公司 | Battery monomer self-discharge measuring and calculating method and device and computer readable storage medium |
| WO2020259008A1 (en) * | 2019-06-24 | 2020-12-30 | 宁德时代新能源科技股份有限公司 | State of charge correction method, device and system for battery, and storage medium |
| CN112557905A (en) * | 2019-09-25 | 2021-03-26 | 比亚迪股份有限公司 | Battery pack, data processing method thereof, computer device, medium, and vehicle |
| CN113156314A (en) * | 2021-04-16 | 2021-07-23 | 东风汽车集团股份有限公司 | Method for measuring and calculating service life attenuation of whole-vehicle-level power battery |
| CN115825784A (en) * | 2022-10-31 | 2023-03-21 | 郑州精益达汽车零部件有限公司 | A Method of Improving the Detection Accuracy of Battery SOC |
| WO2023039826A1 (en) * | 2021-09-17 | 2023-03-23 | 华为数字能源技术有限公司 | Control method, control apparatus and electronic device |
| CN116819346A (en) * | 2023-08-29 | 2023-09-29 | 深圳凌奈智控有限公司 | Battery SOC estimation method, device, equipment and storage medium |
| CN118465553A (en) * | 2024-04-30 | 2024-08-09 | 中国长江三峡集团有限公司 | State of charge estimation method, device, equipment and medium of sodium ion battery |
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| CN106405421A (en) * | 2015-07-27 | 2017-02-15 | 中兴通讯股份有限公司 | Battery state-of-charge (SOC) value evaluation method and device |
| CN105223515A (en) * | 2015-10-13 | 2016-01-06 | 中国第一汽车股份有限公司 | A kind of lithium-ion-power cell charge state estimation method |
| CN106707187A (en) * | 2016-12-26 | 2017-05-24 | 宁德时代新能源科技股份有限公司 | Method and device for determining target SOC of battery |
| CN106802394A (en) * | 2017-02-06 | 2017-06-06 | 清华大学深圳研究生院 | The modification method and device of automobile batteries state-of-charge |
| CN106802394B (en) * | 2017-02-06 | 2020-05-22 | 清华大学深圳研究生院 | Method and device for correcting charge state of automobile battery |
| CN107064814A (en) * | 2017-03-22 | 2017-08-18 | 北京长城华冠汽车科技股份有限公司 | A kind of method for transformation and device of charge states of lithium ion battery curve |
| CN107064814B (en) * | 2017-03-22 | 2019-07-19 | 北京长城华冠汽车科技股份有限公司 | Method and device for converting state-of-charge curve of lithium ion battery |
| CN108535652A (en) * | 2018-02-07 | 2018-09-14 | 丽水博远科技有限公司 | Method based on charging response measurement rechargeable battery remaining capacity |
| CN108535652B (en) * | 2018-02-07 | 2020-11-03 | 丽水博远科技有限公司 | Method for measuring residual capacity of rechargeable battery based on charging response |
| CN109856542A (en) * | 2018-10-23 | 2019-06-07 | 许继集团有限公司 | A kind of scaling method of lithium battery SOC-OCV set of curves, SOC bearing calibration and device |
| CN109856542B (en) * | 2018-10-23 | 2021-01-05 | 许继集团有限公司 | A calibration method, SOC correction method and device for SOC-OCV curve cluster of lithium battery |
| CN111416398A (en) * | 2019-01-08 | 2020-07-14 | 太普动力新能源(常熟)股份有限公司 | Method for processing relative state of charge of rechargeable battery |
| CN111416398B (en) * | 2019-01-08 | 2023-11-14 | 太普动力新能源(常熟)股份有限公司 | Method for correcting relative charge state of rechargeable battery |
| CN110031768A (en) * | 2019-03-26 | 2019-07-19 | 清华大学 | Lithium ion battery can electricity capacity determine that method and state of charge determine method |
| CN110031768B (en) * | 2019-03-26 | 2020-06-16 | 清华大学 | Determination method of available electric capacity and state of charge value of lithium ion battery |
| WO2020259008A1 (en) * | 2019-06-24 | 2020-12-30 | 宁德时代新能源科技股份有限公司 | State of charge correction method, device and system for battery, and storage medium |
| US11231467B2 (en) | 2019-06-24 | 2022-01-25 | Contemporary Amperex Technology Co., Limited | Method, device, and system, for state of charge (SOC) correction for a battery |
| CN112557905A (en) * | 2019-09-25 | 2021-03-26 | 比亚迪股份有限公司 | Battery pack, data processing method thereof, computer device, medium, and vehicle |
| CN112557905B (en) * | 2019-09-25 | 2021-12-07 | 比亚迪股份有限公司 | Battery pack, data processing method thereof, computer device, medium, and vehicle |
| CN110927580A (en) * | 2019-11-05 | 2020-03-27 | 深圳市科陆电子科技股份有限公司 | SOC deviation correction method, device, terminal and storage medium |
| CN111929603A (en) * | 2020-07-14 | 2020-11-13 | 东风时代(武汉)电池系统有限公司 | Battery monomer self-discharge measuring and calculating method and device and computer readable storage medium |
| CN113156314A (en) * | 2021-04-16 | 2021-07-23 | 东风汽车集团股份有限公司 | Method for measuring and calculating service life attenuation of whole-vehicle-level power battery |
| WO2023039826A1 (en) * | 2021-09-17 | 2023-03-23 | 华为数字能源技术有限公司 | Control method, control apparatus and electronic device |
| CN115825784A (en) * | 2022-10-31 | 2023-03-21 | 郑州精益达汽车零部件有限公司 | A Method of Improving the Detection Accuracy of Battery SOC |
| CN116819346A (en) * | 2023-08-29 | 2023-09-29 | 深圳凌奈智控有限公司 | Battery SOC estimation method, device, equipment and storage medium |
| CN116819346B (en) * | 2023-08-29 | 2023-11-07 | 深圳凌奈智控有限公司 | Battery SOC estimation method, device, equipment and storage medium |
| CN118465553A (en) * | 2024-04-30 | 2024-08-09 | 中国长江三峡集团有限公司 | State of charge estimation method, device, equipment and medium of sodium ion battery |
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