CN113093027A - Battery SOC calibration method, device, system, medium and program product - Google Patents

Battery SOC calibration method, device, system, medium and program product Download PDF

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CN113093027A
CN113093027A CN202110363736.5A CN202110363736A CN113093027A CN 113093027 A CN113093027 A CN 113093027A CN 202110363736 A CN202110363736 A CN 202110363736A CN 113093027 A CN113093027 A CN 113093027A
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soc
target battery
voltage
calibration point
battery
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CN113093027B (en
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何佳星
何志超
王垒
吕喆
钱昊
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Beijing Hyperstrong Technology Co Ltd
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Beijing Hyperstrong Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements

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Abstract

The application provides a battery SOC calibration method, device, system, medium and program product. The method comprises the following steps: collecting the working condition of a target battery; the operating condition includes a voltage of the target battery, and a current of the target battery; acquiring the current state of charge (SOC) of a target battery according to the working condition of the target battery; acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC; the mapping relation comprises at least one preset voltage calibration point; and if the voltage calibration point is equal to the voltage of the target battery, calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery. The method and the device reduce the calculation resources occupied by the calibration of the SOC and improve the efficiency of the calibration of the SOC.

Description

Battery SOC calibration method, device, system, medium and program product
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, a system, a medium, and a program product for calibrating a battery SOC.
Background
The State of Charge (SOC) refers to the ratio of the remaining battery capacity to the rated battery capacity under the same operating condition. The current method for calculating the SOC value of the battery is mainly an ampere-hour integration method. The method is to obtain the SOC of the battery by performing time integration on the current of the battery. However, if the current measurement is inaccurate, this may result in less accuracy of the acquired SOC. Taking an electric vehicle as an example, if the accuracy of the acquired SOC of the battery is poor, the accuracy of the remaining battery power displayed by the vehicle may be poor. Therefore, it is important to calibrate the battery SOC value.
The conventional battery SOC calibration method is mainly used for calibrating the battery SOC based on a Kalman filtering algorithm. Before the method is used for calibrating the SOC of the battery, an electrochemical model needs to be established based on various parameters of the battery. The battery SOC is then calibrated using a kalman filter algorithm based on the electrochemical model of the battery. Among them, the electrochemical model refers to a model that can describe physicochemical changes inside the battery, which is established using a complex partial differential equation.
However, the electrochemical model has a complex structure and more model parameters, and requires more calculation resources, which results in that a large amount of calculation resources are required and the time consumption is long when the kalman filter algorithm is used to calibrate the SOC of the battery based on the electrochemical model.
Disclosure of Invention
The application provides a battery SOC calibration method, a device, a system, a medium and a program product, which are used for overcoming the problems that a large amount of computing resources are occupied and the time consumption is long when the battery SOC is calibrated.
In a first aspect, the present application provides a method for calibrating a battery SOC, the method comprising:
collecting the working condition of a target battery; the working condition comprises the voltage of the target battery and the current of the target battery;
acquiring the current state of charge (SOC) of the target battery according to the working condition of the target battery;
acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC; wherein the mapping relationship comprises at least one preset voltage calibration point;
and if the voltage calibration point is equal to the voltage of the target battery, calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery.
Optionally, the calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery includes:
judging whether the absolute value of the difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold value or not;
and if the absolute value of the difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold value, calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery.
Optionally, the calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery includes:
acquiring the duration that the voltage of the target battery is equal to the SOC voltage calibration point;
and calibrating the current SOC by using the SOC calibration point and the duration to obtain the calibrated SOC of the target battery.
Optionally, the calibrating the current SOC by using the SOC calibration point and the duration to obtain the calibrated SOC of the target battery includes:
multiplying the difference value between the SOC calibration point and the current SOC by the quotient of the duration time and the time of a preset SOC calibration updating period to obtain a product;
and adding the current SOC and the product to obtain the calibrated SOC of the target battery.
Optionally, the operating condition of the target battery further includes a temperature of the target battery.
Optionally, the target battery is located on a vehicle, and after obtaining the calibrated SOC of the target battery, the method further includes:
and sending the calibrated SOC to an electronic control unit.
In a second aspect, the present application provides a battery SOC calibration apparatus, the apparatus comprising:
the acquisition module is used for acquiring the working condition of the target battery; the working condition comprises the voltage of the target battery and the current of the target battery;
the acquisition module is used for acquiring the current state of charge (SOC) of the target battery according to the working condition of the target battery; acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC; wherein the mapping relationship comprises at least one preset voltage calibration point;
and the processing module is used for calibrating the current SOC by using the SOC calibration point when the voltage calibration point is equal to the voltage of the target battery, so as to obtain the calibrated SOC of the target battery.
In a third aspect, the present application provides a battery management system, comprising: at least one processor, a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the battery management system to perform the method of any of the first aspects.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement the method of any one of the first aspect.
In a fifth aspect, the present application provides a computer program product comprising a computer program that, when executed by a processor, implements the method of any of the first aspects.
According to the battery SOC calibration method, the battery SOC calibration device, the battery SOC calibration system, the battery SOC calibration medium and the program product, the voltage calibration point corresponding to the voltage of the target battery and the SOC calibration point corresponding to the voltage calibration point are obtained from the preset voltage calibration points according to the working condition of the target battery and the mapping relation between the working condition and the SOC. Then, when the voltage of the target battery is equal to the voltage calibration point, the current SOC is calibrated using the SOC calibration point to obtain a calibrated SOC. According to the method, an electrochemical model does not need to be established for the target battery, the calibration of the SOC is not needed to be realized by using a Kalman filtering algorithm, the calculation resources occupied when the SOC is calibrated are reduced, and the efficiency of calibrating the SOC is improved. In addition, the battery SOC calibration method provided by the application can be used for calibrating the SOC of the target battery in the charging state, the discharging state or the standing state of the target battery, namely the use condition of the method is not limited, real-time calibration can be realized, the accumulated error of the SOC of the target battery is reduced, and the accuracy of the calibration of the SOC of the target battery is improved.
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In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of an application scenario of a battery SOC calibration method;
fig. 2 is a schematic flowchart of a battery SOC calibration method provided in the present application;
fig. 3 is a schematic flowchart of a method for calibrating a current SOC by using an SOC calibration point to obtain a calibrated SOC according to the present application;
FIG. 4 is a schematic flow chart diagram of another method for calibrating battery SOC provided herein;
fig. 5 is a schematic structural diagram of a battery SOC calibration apparatus provided in the present application;
fig. 6 is a schematic structural diagram of a battery management system according to the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic view of an application scenario of a battery SOC calibration method. As shown in fig. 1, an implementation subject of the Battery SOC calibration method may be a Battery Management System (BMS). For example, in the case that the battery management system includes at least one battery supervisory controller (CSC), and at least one Battery Control Unit (BCU), in this case, the BMS may use the CSC to collect the operating conditions of the battery, such as the current, the temperature, the voltage, and the like of the battery, and use the BCU to analyze the operating condition information of the battery collected by the CSC, so as to calibrate the SOC.
It should be understood that the present application is not limited to the type of battery. The battery may be, for example, a lithium battery, a lead-acid battery, or the like. The lithium battery may be, for example, a lithium-ion hybrid battery such as a ternary lithium battery, lithium iron phosphate, or lithium manganate.
Taking the above battery and BMS applied to the electric vehicle field as an example, the electronic control unit of the vehicle needs to calculate the driving mileage of the vehicle according to the battery SOC and control the vehicle display device to display the remaining capacity of the battery. At present, the method for calculating the SOC of the battery is mainly an ampere-hour integration method. In calculating the SOC of the battery using this method, the BMS needs to measure the current of the battery and perform time integration on the current of the battery. However, in the process of obtaining the SOC of the battery by using the ampere-hour integration method, if the current measurement is inaccurate, the accuracy of the obtained SOC may be poor. The accumulation of long-term errors may lead to increasingly poor SOC accuracy, which may lead to poor driving range of the vehicle, and poor accuracy of the displayed remaining capacity. Therefore, the battery SOC needs to be calibrated to improve the accuracy of the SOC.
The conventional battery SOC calibration method is mainly used for calibrating the battery SOC based on a Kalman filtering algorithm. Before the method is used to calibrate the SOC of the battery, an electrochemical model needs to be built based on various parameters of the battery. The battery SOC is then calibrated using a kalman filter algorithm based on the electrochemical model.
However, the electrochemical model has a complex structure and more model parameters, and occupies more computing resources, so that when the battery SOC is calibrated by using the kalman filter algorithm based on the electrochemical model, a large amount of computing resources are occupied and the time consumption is long.
In view of the above problems with the conventional battery SOC calibration method, the present application proposes a method for calibrating the current SOC using an SOC calibration point corresponding to a voltage calibration point when the voltage of the battery is equal to the voltage calibration point corresponding to the voltage. The voltage calibration point corresponding to the voltage of the target battery and the SOC calibration point corresponding to the voltage calibration point are obtained based on the working condition of the battery and the mapping relation between the working condition and the SOC, and therefore the accuracy of calibrating the current SOC of the battery is guaranteed. The method does not need to establish a complex electrochemical model for the battery and realize the calibration of the SOC based on the Kalman filtering algorithm, reduces the calculation resources occupied when the SOC is calibrated, and improves the efficiency of the SOC calibration.
It should be understood that the battery SOC calibration method provided by the present application may be applied not only to the field of electric vehicles, but also to any field that uses a battery and a battery management system, such as hybrid electric vehicles, battery energy storage systems, and the like.
For convenience of description, the technical solutions of the present application will be described in detail below with reference to specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a schematic flow chart of a battery SOC calibration method provided in the present application. As shown in fig. 2, the method comprises the steps of:
and S101, collecting the working condition of the target battery.
The operating condition includes a voltage of the target battery, and a current of the target battery.
And if the target battery is in a charging state, the voltage of the target battery is a charging voltage. If the target battery is in a discharge state, the voltage of the target battery is a discharge voltage. And if the target battery is in a static state, the voltage of the target battery is an open-circuit voltage. Wherein, the static state means that the loop of the target battery is in an open circuit state.
The current of the target battery refers to a current flowing through the target battery when the target battery is charged, discharged, or left standing. Wherein the value of the current is zero when the target battery is in a stationary state.
Illustratively, the BMS may collect the operating condition of the target battery through the CSC.
And S102, acquiring the current SOC of the target battery according to the working condition of the target battery.
For example, the BMS may obtain the current SOC of the target battery by using an ampere-hour integration method according to the collected current of the target battery. For a specific implementation process of obtaining the current SOC by using the ampere-hour integration method, reference may be made to an existing implementation manner, which is not described herein again.
It should be understood that the present application does not limit how the BMS obtains the current SOC of the target battery according to the operating condition of the target battery. In specific implementation, the BMS may further obtain the current SOC of the target battery by using an open circuit voltage method, a neural network method, and the like, for example, according to a working condition of the target battery.
S103, acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC.
The mapping relation comprises at least one preset voltage calibration point. When the target battery is in different states (a charging state, a discharging state and a standing state), the mapping relation between the working condition and the SOC is different. For example, the mapping relationship between the operating condition of the target battery and the SOC may be as shown in table 1:
TABLE 1
Figure BDA0003006567840000061
Figure BDA0003006567840000071
Illustratively, the voltage calibration point corresponding to the voltage of the target battery is one of the voltage 1 to the voltage n according to the mapping relationship shown in table 1. Assuming that the voltage calibration point corresponding to the voltage of the target battery is voltage 3, and the current of the target battery is current 1 (or the absolute value of the difference between the current of the target battery and the current 1 is within a preset range), the SOC calibration point corresponding to the voltage calibration point is SOC 13.
How to determine the voltage calibration point corresponding to the voltage of the target battery from the plurality of voltage calibration points is explained as follows:
when the target battery is in a charged state, the amount of electricity in the target battery increases, that is, in the above-described mapping relationship between the voltage and the SOC, the voltage tends to increase as the SOC increases. In this implementation, the voltage calibration point corresponding to the voltage of the target battery is a calibration point at which the difference between the voltage of the target battery and the voltage of the target battery is smallest and greater than or equal to the voltage of the target battery among the plurality of voltage calibration points.
When the target battery is in a discharge state, the amount of electricity in the target battery becomes smaller, that is, in the above-described mapping relationship between the voltage and the SOC, the voltage tends to decrease as the SOC becomes smaller. In this implementation, the voltage calibration point corresponding to the voltage of the target battery is a calibration point at which the difference between the voltage of the target battery and the voltage of the target battery is smallest among the plurality of voltage calibration points and is less than or equal to the voltage of the target battery.
If the target battery is in a discharged, stationary state, the open-circuit voltage of the target battery rises back over time, and the SOC may decrease due to self-discharge of the battery when the battery is left stationary for a long period of time. In this implementation, the voltage calibration point corresponding to the voltage of the target battery is a calibration point at which the difference between the voltage of the target battery and the voltage of the target battery is smallest and greater than or equal to the voltage of the target battery among the plurality of voltage calibration points. If the target battery is in a post-charge static state, the open-circuit voltage of the target battery decreases with time, and the SOC may decrease due to self-discharge of the battery upon long-term static. In this implementation, the voltage calibration point corresponding to the voltage of the target battery is a calibration point at which the difference between the voltage of the target battery and the voltage of the target battery is smallest among the plurality of voltage calibration points and is less than or equal to the voltage of the target battery.
Optionally, for example, the SOC value of the target battery (or a battery of the same type as the target battery) under different operating conditions may be measured by the electric quantity measuring device, so as to obtain the mapping relationship between the different operating conditions and the SOC. Illustratively, the BMS may be connected to the electricity amount measuring device to receive the above mapping relationship and pre-stored in the BMS. Alternatively, the BMS may receive the mapping relationship input by the user and store the mapping relationship in the BMS in advance.
The voltage calibration point in the mapping relationship may be at least one voltage calibration point set by a user according to a discharge characteristic curve and/or a charge characteristic curve of the target battery. Alternatively, the voltage calibration point may be at least one voltage calibration point that is set on average according to the voltage range of the target battery. Or, the BMS may also obtain at least one SOC calibration point input by the user and then obtain at least one voltage calibration point according to the mapping relationship.
And S104, judging whether the voltage calibration point is equal to the voltage of the target battery or not.
After the BMS acquires the voltage of the target battery and the voltage calibration point corresponding to the voltage of the target battery, it may be determined whether the voltage calibration point corresponding to the voltage of the target battery is equal to the voltage of the target battery. If equal, indicating that the current SOC of the target battery needs to be calibrated, the BMS may perform step S105. If not, it indicates that the current SOC of the target battery does not need to be calibrated, and optionally, the BMS may perform the foregoing steps S101 to S104 according to a preset cycle.
And S105, calibrating the current SOC by using the SOC calibration point corresponding to the voltage calibration point to obtain the calibrated SOC of the target battery.
Alternatively, after determining that the voltage calibration point is equal to the voltage of the target battery, the BMS may directly calibrate the current SOC using the SOC calibration point to obtain the calibrated SOC of the target battery. For example, the BMS may multiply the SOC calibration point by a first preset coefficient to obtain the calibrated SOC of the target battery, for example. Alternatively, the BMS may set the SOC calibration point as the target battery calibrated SOC.
Alternatively, after the voltage calibration point is equal to the voltage of the target battery, the BMS may first determine whether an absolute value of a difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold.
If the absolute value of the difference between the SOC calibration point and the current SOC is greater than or equal to the preset threshold, which indicates that the error of the current SOC is large, the BMS may calibrate the current SOC using the SOC calibration point to obtain the calibrated SOC of the target battery.
If the absolute value of the difference between the SOC calibration point and the current SOC is smaller than the preset threshold, which indicates that the error of the current SOC is smaller, optionally, the BMS may make the calibrated SOC equal to the SOC calibration point.
In this embodiment, a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point are obtained from preset voltage calibration points according to the operating condition of the target battery and the mapping relationship between the operating condition and the SOC. Then, when the voltage of the target battery is equal to the voltage calibration point, the current SOC is calibrated using the SOC calibration point to obtain a calibrated SOC. According to the method, an electrochemical model does not need to be established for the target battery, the calibration of the SOC is not needed to be realized by using a Kalman filtering algorithm, the calculation resources occupied when the SOC is calibrated are reduced, and the efficiency of calibrating the SOC is improved. In addition, the battery SOC calibration method provided by the application can be used for calibrating the SOC of the target battery in the charging state, the discharging state or the standing state of the target battery, namely the use condition of the method is not limited, real-time calibration can be realized, the accumulated error of the SOC of the target battery is reduced, and the accuracy of the calibration of the SOC of the target battery is improved.
As a possible implementation, the BMS may be connected to an electronic device having a processing function, so that the BMS may transmit the calibrated SOC to the electronic device. The electronic device may also control a display device to display the calibrated SOC, for example. For example, when the target battery and the BMS are applied to an electric vehicle and the electronic device is an electronic control unit of the electric vehicle, the BMS may further send the calibrated SOC of the target battery to the electronic control unit of the vehicle after obtaining the calibrated SOC. Then, the electronic control unit may control a display device of the vehicle to display the remaining capacity of the target battery according to the calibrated SOC, and/or calculate the driving range of the vehicle according to the calibrated SOC.
As a possible implementation manner, the working condition of the target battery may further include the temperature of the target battery, so as to further improve the accuracy of obtaining the voltage calibration point corresponding to the voltage of the target battery and the accuracy of the SOC calibration point corresponding to the voltage calibration point, thereby further improving the accuracy of calibrating the current SOC. In this implementation, for example, on the basis of the foregoing table 1, the operating condition of the target battery, and the mapping relationship between the operating condition and the SOC may be as shown in the following table 2:
TABLE 2
Figure BDA0003006567840000091
Figure BDA0003006567840000101
Then, the BMS may obtain a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to a condition of the target battery including the temperature of the target battery and a mapping relationship between the condition and the SOC.
As one possible implementation manner, how the BMS calibrates the current SOC using the SOC calibration point to obtain the calibrated SOC of the target battery will be described below. Fig. 3 is a flowchart illustrating a method for calibrating a current SOC by using an SOC calibration point to obtain a calibrated SOC according to the present application. As shown in fig. 3, as a possible implementation manner, the step S105 may include the following steps:
s201, acquiring the duration that the voltage of the target battery is equal to the SOC voltage calibration point.
Considering that the battery SOC is time-varying, the calibrated SOC of the target battery may be acquired based on the duration for which the voltage of the target battery is equal to the SOC voltage calibration point.
Alternatively, after determining that the voltage of the target battery is equal to the SOC voltage calibration point, the BMS may record a start time when the voltage of the target battery is equal to the SOC voltage calibration point and an end time when the voltage of the target battery is equal to the SOC voltage calibration point, and then acquire a duration for which the voltage of the target battery is equal to the SOC voltage calibration point.
S202, calibrating the current SOC by using the SOC calibration point corresponding to the voltage calibration point and the duration to obtain the calibrated SOC of the target battery.
After acquiring the duration in which the voltage of the target battery is equal to the voltage calibration point, the BMS may alternatively obtain the calibrated SOC of the target battery by the following equation (1).
Figure BDA0003006567840000102
Therein, SOCAfter calibrationRepresenting the calibrated SOC of the target battery. SOCAt presentRepresenting the current SOC of the target battery. t represents the duration of time that the voltage of the target battery is equal to the voltage calibration point. Δ T represents the duration of a preset SOC calibration update period. SOCCalibration pointShowing the SOC calibration point corresponding to the voltage calibration point.
It should be understood that how the BMS obtains the Δ T, and the value of the Δ T is not limited in the present application. Illustratively, the BMS may receive and store in the BMS a value of Δ T input by a user, for example. Alternatively, the BMS may also take the duration of the cutoff voltage of the target battery as Δ T, for example. The cutoff voltage is a minimum operating voltage at which the battery is not suitable for further discharging when the battery is discharged. Alternatively, the BMS may also take the duration of the peak voltage of the target battery discharge as Δ T. Still alternatively, the Δ T may also be related to the hardware configuration of the BMS, for example.
Alternatively, the BMS may also use the SOC obtained according to equation (1) as the target battery initial calibration SOC, for example. Then, the product of the initial calibration SOC and a second preset coefficient is used as the target battery calibrated SOC.
In this embodiment, the current SOC is calibrated through the SOC calibration point corresponding to the voltage calibration point and the duration of the voltage of the target battery equal to the voltage calibration point, so that the influence of the duration of the voltage of the target battery on the SOC of the target battery is considered, and the accuracy of calibrating the current SOC is improved.
Based on the above embodiments, taking the above target battery and BMS as an example for application in the field of electric vehicles, fig. 4 is a schematic flow chart of another battery SOC calibration method provided by the present application. As shown in fig. 4, the method comprises the steps of:
s301, collecting the working condition of the target battery.
Wherein the operating condition includes a voltage of the target battery, a current of the target battery, and a temperature of the target battery.
It should be understood that the present application does not limit the driving condition of the electric vehicle. For example, the driving condition of the electric vehicle may be any one of acceleration, deceleration, constant speed, standstill, and the like. The state of the target battery may be any one of a charged state, a discharged state, and a static state.
And S302, acquiring the current SOC of the target battery according to the working condition of the target battery.
For example, the BMS may obtain the current SOC of the target battery by using an ampere-hour integration method according to the operating condition of the target battery.
S303, acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC.
The mapping relation comprises at least one preset voltage calibration point. For example, the SOC value of the target battery under different operating conditions may be measured by using the electric quantity measuring device to obtain the mapping relationship between the operating conditions and the SOC. Specifically, how to obtain a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relationship between the working condition and the SOC may refer to the method shown in the foregoing embodiment, which is not described herein again.
S304, judging whether the voltage calibration point is equal to the voltage of the target battery or not. If yes, go to S305; if not, the process may return to step S301.
S305, judging whether the absolute value of the difference value between the SOC calibration point corresponding to the voltage calibration point and the current SOC is larger than or equal to a preset threshold value. If yes, go to step S306. If not, the BMS may optionally perform step S308.
And S306, acquiring the duration of the voltage of the target battery equal to the voltage calibration point.
And S307, calibrating the current SOC by using the SOC calibration point corresponding to the voltage calibration point and the duration to obtain the calibrated SOC of the target battery.
For example, the BMS may acquire the calibrated SOC of the target battery by the foregoing equation (1).
And S308, making the calibrated SOC equal to the SOC calibration point.
And S309, transmitting the calibrated SOC to an electronic control unit of the vehicle.
After receiving the calibrated SOC, the electronic control unit of the vehicle may control the display device of the vehicle to display the remaining capacity of the target battery according to the calibrated SOC, so as to improve the accuracy of displaying the remaining capacity of the battery by the vehicle. The electronic control unit can also calculate the endurance mileage of the vehicle according to the calibrated SOC so as to improve the accuracy of obtaining the endurance mileage of the vehicle.
Fig. 5 is a schematic structural diagram of a battery SOC calibration apparatus provided in the present application. As shown in fig. 5, the apparatus includes: an acquisition module 41, an acquisition module 42, and a processing module 43. Wherein,
the acquisition module 41 is used for acquiring the working condition of the target battery; the operating condition includes a voltage of the target battery, and a current of the target battery.
The obtaining module 42 is configured to obtain a current state of charge SOC of the target battery according to a working condition of the target battery; acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC; wherein the mapping relationship comprises at least one preset voltage calibration point;
and a processing module 43, configured to calibrate the current SOC by using the SOC calibration point when the voltage calibration point is equal to the voltage of the target battery, so as to obtain the calibrated SOC of the target battery.
Optionally, the processing module 43 is specifically configured to determine whether an absolute value of a difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold; and when the absolute value of the difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold value, calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery.
Optionally, the processing module 43 is specifically configured to obtain a duration that the voltage of the target battery is equal to the SOC voltage calibration point; and calibrating the current SOC by using the SOC calibration point and the duration to obtain the calibrated SOC of the target battery.
Optionally, in the foregoing implementation manner, the processing module 43 is specifically configured to multiply the difference between the SOC calibration point and the current SOC by a quotient between the duration and a duration of a preset SOC calibration update period to obtain a product; and adding the current SOC and the product to obtain the calibrated SOC of the target battery.
Optionally, the operating condition of the target battery further includes a temperature of the target battery.
Optionally, as shown in fig. 5, the above battery SOC calibration apparatus may further include a sending module 44, configured to send the calibrated SOC to the electronic control unit.
The battery SOC calibrating device provided by the application is used for executing the embodiment of the battery SOC calibrating method, the implementation principle and the technical effect are similar, and the details are not repeated.
Fig. 6 is a schematic structural diagram of a battery management system according to the present application. As shown in fig. 6, the battery management system 500 may include: at least one processor 501 and memory 502.
The memory 502 is used for storing programs. In particular, the program may include program code including computer operating instructions.
Memory 502 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
Processor 501 is configured to execute computer-executable instructions stored in memory 502 to implement the battery SOC calibration method described in the foregoing method embodiments. The processor 501 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present Application.
Optionally, the battery management system 500 may further include a communication interface 503. In a specific implementation, if the communication interface 503, the memory 502 and the processor 501 are implemented independently, the communication interface 503, the memory 502 and the processor 501 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. Buses may be classified as address buses, data buses, control buses, etc., but do not represent only one bus or type of bus.
Optionally, in a specific implementation, if the communication interface 503, the memory 502, and the processor 501 are integrated into a chip, the communication interface 503, the memory 502, and the processor 501 may complete communication through an internal interface.
The present application also provides a computer-readable storage medium, which may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and in particular, the computer-readable storage medium stores program instructions, and the program instructions are used in the method in the foregoing embodiments.
The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the battery management system may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the battery management system to implement the battery SOC calibration method provided by the various embodiments described above.
The present application further provides a vehicle comprising at least one battery, and the above-described battery management system. The battery management system implements the battery SOC calibration method provided in the various embodiments described above.
The application also provides an electronic device, which comprises the battery management system. The battery management system implements the battery SOC calibration method provided in the various embodiments described above.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A method of calibrating a battery SOC, the method comprising:
collecting the working condition of a target battery; the working condition comprises the voltage of the target battery and the current of the target battery;
acquiring the current state of charge (SOC) of the target battery according to the working condition of the target battery;
acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC; wherein the mapping relationship comprises at least one preset voltage calibration point;
and if the voltage calibration point is equal to the voltage of the target battery, calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery.
2. The method of claim 1, wherein said calibrating said current SOC using said SOC calibration point to obtain said target battery calibrated SOC comprises:
judging whether the absolute value of the difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold value or not;
and if the absolute value of the difference between the SOC calibration point and the current SOC is greater than or equal to a preset threshold value, calibrating the current SOC by using the SOC calibration point to obtain the calibrated SOC of the target battery.
3. The method of claim 1 or 2, wherein said calibrating said current SOC using said SOC calibration point to obtain said target battery calibrated SOC comprises:
acquiring the duration that the voltage of the target battery is equal to the SOC voltage calibration point;
and calibrating the current SOC by using the SOC calibration point and the duration to obtain the calibrated SOC of the target battery.
4. The method of claim 3, wherein the calibrating the current SOC using the SOC calibration point and the duration to obtain the calibrated SOC for the target battery comprises:
multiplying the difference value between the SOC calibration point and the current SOC by the quotient of the duration time and the time of a preset SOC calibration updating period to obtain a product;
and adding the current SOC and the product to obtain the calibrated SOC of the target battery.
5. The method of claim 1 or 2, wherein the operating condition of the target battery further comprises a temperature of the target battery.
6. The method of claim 1 or 2, wherein the target battery is located on a vehicle, and after obtaining the target battery calibrated SOC, the method further comprises:
and sending the calibrated SOC to an electronic control unit.
7. A battery SOC calibration apparatus, the apparatus comprising:
the acquisition module is used for acquiring the working condition of the target battery; the working condition comprises the voltage of the target battery and the current of the target battery;
the acquisition module is used for acquiring the current state of charge (SOC) of the target battery according to the working condition of the target battery; acquiring a voltage calibration point corresponding to the voltage of the target battery and an SOC calibration point corresponding to the voltage calibration point according to the working condition of the target battery and the mapping relation between the working condition and the SOC; wherein the mapping relationship comprises at least one preset voltage calibration point;
and the processing module is used for calibrating the current SOC by using the SOC calibration point when the voltage calibration point is equal to the voltage of the target battery, so as to obtain the calibrated SOC of the target battery.
8. A battery management system, comprising: at least one processor, a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the battery management system to perform the method of any of claims 1-6.
9. A computer-readable storage medium having computer-executable instructions stored thereon which, when executed by a processor, implement the method of any one of claims 1-6.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the method of any of claims 1-6 when executed by a processor.
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