CN117665575A - Battery state of charge calibration method and device - Google Patents
Battery state of charge calibration method and device Download PDFInfo
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Abstract
The invention provides a battery state of charge calibration method and a device, wherein the method comprises the following steps: recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cutoff voltage; obtaining a first open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a first preset time, and obtaining a first state of charge variation of the target battery; according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage; and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery. The method can calibrate the OCV-SOC curve spontaneously after the battery is charged to a full charge state, and can solve the problem of inaccurate SOC calculation caused by continuously using the OCV-SOC curve of the battery in a brand new state under the condition of battery aging.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a battery state of charge calibration method and device.
Background
During battery life cycle use, the current state of charge of the battery may be calculated using an OCV-SOC curve that characterizes a correspondence between Open Circuit Voltage (OCV) of the battery and battery state of charge (SOC). At present, the initial OCV-SOC curve of the battery in a brand new state is continuously used in the whole life cycle use process of the battery. However, as the battery ages, the corresponding relationship between the actual OCV and the SOC will change, in this case, if the current state of charge is calculated by continuously using the initial OCV-SOC curve of the battery in a brand new state, the calculation result of the current state of charge will be inaccurate, and thus the estimation of the driving range of the electric vehicle will be inaccurate, and the problem of the driving range jump of the electric vehicle will be generated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a battery state of charge calibration method and device to solve the problems that the calculation result of the current state of charge is inaccurate, the estimation of the driving mileage of an electric vehicle is inaccurate and the driving mileage jump of the electric vehicle is generated by using an initial OCV-SOC curve of a battery in a brand new state to calculate the current state of charge.
To solve or improve the above technical problems to a certain extent, according to an aspect of the present invention, there is provided a battery state of charge calibration method, including:
recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cut-off voltage;
obtaining a first open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a first predetermined time, and obtaining a first state of charge variation of the target battery;
according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage;
and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery.
In some embodiments, the obtaining the first state of charge variation of the target battery includes: and calculating and obtaining the change quantity of the charge state of the target battery after the target battery is discharged for a first preset time in a capacity integration mode.
In some embodiments, the method further comprises:
obtaining a second open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a second predetermined time, and obtaining a second state of charge variation of the target battery;
calculating to obtain a second battery state of charge corresponding to the second open-circuit voltage according to the full-load state and the second state of charge variation;
and calibrating a second initial state of charge corresponding to the second open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the second state of charge of the battery.
In some embodiments, after the target battery is charged to the full charge cutoff voltage and/or after the target battery is discharged for a first predetermined time, further comprising:
performing standing treatment on the target battery according to preset standing time to enable the target battery to be restored to a stable state;
or, the target battery is recovered to a stable state by performing a cell calibration experiment on the target battery.
In some embodiments, the method further comprises: and determining the preset standing time based on the ambient temperature of the target battery and/or the electrochemical system corresponding to the target battery.
According to another aspect of the present invention, there is provided a battery state of charge acquisition method including:
recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cut-off voltage;
responding to the discharging of the target battery to the current time, obtaining the current open-circuit voltage of the target battery after the stabilizing, and obtaining the state of charge variation of the target battery;
and calculating to obtain the current state of charge corresponding to the current open-circuit voltage according to the full-load state and the state of charge variation.
In some embodiments, after the target battery is charged to a full charge cutoff voltage and/or after the target battery is discharged to a current time, further comprising:
performing standing treatment on the target battery according to preset standing time to enable the target battery to be restored to a stable state;
or, the target battery is recovered to a stable state by performing a cell calibration experiment on the target battery.
According to another aspect of the present invention, there is provided a battery state of charge calibration apparatus comprising:
the full-load state recording unit is used for responding to the state that the target battery is charged to the full-charge cut-off voltage and recording that the state of charge of the target battery after being stabilized is the full-load state;
a first state-of-charge variation obtaining unit configured to obtain a first open-circuit voltage after the target battery is stabilized, and to obtain a first state-of-charge variation of the target battery, in response to the target battery being discharged for a first predetermined time;
a first battery state of charge obtaining unit, configured to calculate and obtain a first battery state of charge corresponding to the first open-circuit voltage according to the full load state and the first state of charge variation;
and the charge state calibration unit is used for calibrating a first initial charge state corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the charge state of the battery according to the charge state of the first battery.
According to another aspect of the present invention, there is provided an electronic device including a processor and a memory; wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of any of the above embodiments.
According to another aspect of the invention there is provided a computer readable storage medium having stored thereon one or more computer instructions, characterised in that the instructions are executable by a processor to implement a method according to any of the embodiments described above.
Compared with the prior art, the invention has the following advantages:
according to the battery state-of-charge calibration method provided by the invention, in response to the fact that the target battery is charged to the full charge cut-off voltage, the state-of-charge of the target battery after being stabilized is recorded as the full load state; obtaining a first open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a first preset time, and obtaining a first state of charge variation of the target battery; according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage; and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery. According to the method, the OCV-SOC curve can be calibrated spontaneously after the battery is charged to a full charge state, namely, the OCV-SOC curve can be calibrated automatically according to the service condition of the battery, the problem of inaccurate SOC calculation caused by continuously using the OCV-SOC curve of the battery in a brand new state under the condition of battery aging can be solved, the accuracy of calculating the SOC can be improved by using the calibrated OCV-SOC curve, and the estimation accuracy of the SOC of the battery can be ensured under any attenuation degree.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a battery state of charge calibration method provided in an embodiment of the present application;
FIG. 2 is a flow chart of a method for acquiring battery state of charge according to an embodiment of the present application;
FIG. 3 is a block diagram of a battery state of charge calibration apparatus according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a logic structure of an electronic device according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a battery state of charge acquisition device according to an embodiment of the present application.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the preset purpose, the following detailed description refers to the specific implementation and effects of the user identity authentication method according to the present invention with reference to the accompanying drawings and preferred embodiments.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other ways than those herein described and similar generalizations can be made by those skilled in the art without departing from the spirit of the application and the application is therefore not limited to the specific embodiments disclosed below.
The state of charge (SOC) of a battery is also called the remaining capacity, and is the ratio of the remaining capacity of the battery after the battery is used for a period of time or is left unused for a long period of time to the capacity of the battery in its fully charged state, and is usually expressed as a percentage. The value range is 0-1, when soc=0, the battery is completely discharged, and when soc=1, the battery is completely full, which is an essential consideration in controlling the operation of the battery. The open circuit voltage (Open circuit voltage OCV) refers to the terminal voltage of the battery in an open circuit state. The open circuit voltage of a battery is equal to the difference between the positive electrode potential and the negative electrode potential of the battery when the battery is open circuit (i.e., when no current is flowing through both poles). In the method of estimating the SOC of the battery, the open circuit voltage method estimates the SOC by detecting the open circuit voltage based on a one-to-one correspondence (OCV-SOC curve) between the open circuit voltage OCV and the state of charge SOC, and thus, a true and accurate OCV-SOC curve is an important condition in estimating the SOC. However, in the current use process of the whole life cycle of the power battery, the initial OCV-SOC curve of the battery in a brand-new state is continuously used, and the real corresponding relation between the OCV and the SOC of the battery changes along with the aging of the battery.
Aiming at the battery state of charge estimation scene, in order to avoid the problem that the estimation result of the battery state of charge is inaccurate and the driving distance estimation of the electric automobile is inaccurate and the driving distance jump of the electric automobile is generated by using the initial OCV-SOC curve of the battery in a brand new state in the prior art, the application provides a battery state of charge calibration method, a battery state of charge calibration device corresponding to the method, electronic equipment and a computer readable storage medium. The following provides detailed descriptions of the above methods, apparatuses, electronic devices, and computer-readable storage media.
An embodiment of the present application provides a battery state of charge calibration method, and an application body of the method may be a computing device application for calibrating a battery state of charge (SOC) in an OCV-SOC curve, where the computing device application may be operated in a battery management module of an electric vehicle. Fig. 1 is a flowchart of a battery state of charge calibration method according to a first embodiment of the present application, and the method according to the present embodiment is described in detail below with reference to fig. 1. The embodiments referred to in the following description are intended to illustrate the method principles and not to limit the practical use.
As shown in fig. 1, the battery state of charge calibration method provided in this embodiment includes the following steps:
s101, in response to the target battery being charged to the full charge cut-off voltage, recording the state of charge of the target battery after being stabilized as a full charge state.
The step is used for recording the corresponding state of charge of the target battery after the target battery is restored to a stable state as a full charge state when the target battery is charged to a full charge cut-off voltage, wherein the full charge state is the state of charge of the target battery when the target battery is fully charged, and the value of the full charge state is 1. For example, in the use process of the target battery, after each charging, the full charge state of the target battery can be recorded, so as to implement the battery charge state calibration method provided by the embodiment, so as to calibrate the corresponding relationship between the open circuit voltage OCV and the charge state SOC in the OCV-SOC curve.
In this embodiment, after the target battery is charged to the full charge cutoff voltage, the target battery is further required to be restored to the stable state by: performing a standing treatment on the target battery according to a preset standing time to enable the target battery to be restored to a stable state, wherein in the embodiment, the preset standing time can be determined based on the environmental temperature of the target battery and/or the electrochemical system corresponding to the target battery, namely, different environmental temperatures or different electrochemical systems correspond to different standing times; or, the target battery is restored to a stable state by performing a cell calibration experiment on the target battery. The voltage of the target battery after the target battery is restored to the stable state is the open circuit voltage of the battery in the full charge state corresponding to the full load state.
S102, in response to the target battery discharging for a first preset time, obtaining a first open-circuit voltage after the target battery is stabilized, and obtaining a first state of charge variation of the target battery.
After the above steps are performed, when the target battery is charged to the full charge cut-off voltage and the corresponding state of charge after the target battery is restored to the stable state is recorded as the full charge state, the step is performed after the target battery is discharged for a first predetermined time, the stabilized first open-circuit voltage of the target battery is obtained, and the first state of charge variation of the target battery is obtained. In other words, each time the target battery is discharged for a period of time, the state-of-charge variation corresponding to the period of time and the open-circuit voltage after the discharge can be obtained, for example, in the actual use process of the target battery, when the electric vehicle runs for a certain distance (corresponding to the first preset time for discharging) after the battery reaches the full charge state, the battery control module can perform the standing treatment on the target battery after the target battery is restored to the stable state (according to the preset standing time, or perform the cell calibration experiment on the target battery to restore the target battery to the stable state), grasp the corresponding open-circuit voltage (i.e., the first open-circuit voltage), and calculate the state-of-charge variation of the target battery in the period of time through the capacity integration mode (ampere-hour integration method).
And S103, calculating and obtaining the first battery charge state corresponding to the first open-circuit voltage according to the full-load state and the first charge state variation.
After recording the full load state of the target battery, grabbing the first open-circuit voltage after the target battery is discharged for a first preset time and obtaining the first state of charge variation of the target battery, the method is used for calculating and obtaining the first battery state of charge corresponding to the first open-circuit voltage based on the full load state and the first state of charge variation, and the first open-circuit voltage and the first battery state of charge have a real corresponding relation. For example, if the full charge state of the target battery is 1 and the first state of charge variation is 30%, the first state of charge of the battery is 70%.
And S104, calibrating a first initial charge state corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the charge state of the battery according to the first charge state of the battery.
After the first battery state of charge corresponding to the first open circuit voltage is obtained through calculation in the above step, the present step is used for calibrating an initial correspondence between the open circuit voltage and the battery state of charge of the target battery based on the first open circuit voltage and the first battery state of charge, specifically, calibrating a first initial state of charge corresponding to the first open circuit voltage in an initial correspondence between the open circuit voltage and the battery state of charge of the target battery, for example, in an initial OCV-SOC curve of the target battery, the first initial SOC corresponding to the first OCV is 75%, and the first SOC corresponding to the first OCV obtained through calculation in the above step is 70%, and then the first initial SOC corresponding to the first OCV in the initial OCV-SOC curve is correspondingly adjusted to the first SOC, so as to complete calibration of the correspondence between the open circuit voltage and the battery state of charge of the target battery.
In this embodiment, after the target battery is fully charged once, a plurality of initial states of charge corresponding to the plurality of open-circuit voltages in an initial correspondence between the open-circuit voltage and the state of charge of the target battery may be checked, for example, after the target battery is discharged for a second predetermined time, a second open-circuit voltage after the target battery is stabilized is obtained by corresponding grabbing, and a second state of charge variation of the target battery is obtained; calculating to obtain a second battery state of charge corresponding to the second open-circuit voltage according to the full-load state recorded in the step S101 and the second state of charge variation; and according to the second battery state of charge, calibrating a second initial state of charge corresponding to the second open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the battery state of charge.
According to the battery state-of-charge calibration method provided by the embodiment, after the target battery is charged to the full charge cut-off voltage, the state-of-charge of the target battery after being stabilized is recorded as the full load state; after the target battery is discharged for a first preset time, obtaining a first open-circuit voltage after the target battery is stabilized, and obtaining a first state of charge variation of the target battery; according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage; and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery. By using the method, the OCV-SOC curve can be calibrated spontaneously after the battery is charged to a full charge state in the actual use process of the battery, namely, the OCV-SOC curve can be calibrated automatically in the actual use scene of the battery, the problem of inaccurate SOC calculation caused by continuously using the OCV-SOC curve of the battery in a brand new state under the condition of battery aging can be solved, the accuracy of estimating the SOC can be improved by using the calibrated OCV-SOC curve, the SOC calculation accuracy of the battery in any degree can be ensured, the current state of charge of the battery is prevented from being estimated by using the initial OCV-SOC curve of the battery in the brand new state, the estimation result of the state of charge of the battery is inaccurate, and the problem of inaccurate estimation of the running mileage of an electric vehicle and jump of the running mileage of the electric vehicle is further caused.
Another embodiment of the present application provides a method for acquiring a state of charge of a battery, as shown in fig. 2, including the steps of:
s201, in response to the target battery being charged to the full charge cut-off voltage, recording the state of charge of the target battery after being stabilized as the full charge state.
For details of this step, refer to step S101 in the above embodiment, and are not described herein.
S202, in response to the target battery discharging to the current time, obtaining the current open circuit voltage of the target battery after stabilizing, and obtaining the state of charge variation of the target battery.
The step is used for obtaining the current open circuit voltage after the target battery is stabilized after the target battery is discharged to the current time, and obtaining the state of charge variation of the target battery, for example, calculating the state of charge variation of the target battery by a capacity integration mode (ampere-hour integration method).
After the target battery is charged to the full charge cut-off voltage, or after the target battery is discharged to the current time, the target battery can be subjected to standing treatment according to the preset standing time, so that the target battery is restored to a stable state, or a battery core calibration experiment is performed on the target battery, so that the target battery is restored to the stable state.
And S203, calculating and obtaining the current state of charge corresponding to the current open-circuit voltage according to the full-load state of charge and the state of charge variation.
By using the battery state of charge obtaining method provided by the embodiment, the current state of charge corresponding to the current open-circuit voltage of the battery can be accurately calculated and obtained based on the actual use state of the battery after the battery is fully charged, so that the problem that the current state of charge of the battery is estimated by using the initial OCV-SOC curve of the battery in a brand-new state, the estimation result of the state of charge of the battery is inaccurate, the estimation of the driving mileage of the electric automobile is inaccurate, and the driving mileage jump of the electric automobile is generated is avoided.
The foregoing embodiments provide a battery state of charge calibration method, and correspondingly, another embodiment of the present application further provides a battery state of charge calibration device, and since the device embodiments are substantially similar to the method embodiments, the description is relatively simple, and details of relevant technical features should be referred to the corresponding descriptions of the method embodiments provided above, and the following descriptions of the device embodiments are merely illustrative.
Referring to fig. 3 for an understanding of the embodiment, fig. 3 is a block diagram of a battery state of charge calibration device according to the embodiment, and as shown in fig. 3, the battery state of charge calibration device according to the embodiment includes:
a full charge state recording unit 301, configured to record the state of charge of the target battery after the target battery is stabilized as a full charge state in response to the target battery being charged to a full charge cut-off voltage;
a first state of charge variation obtaining unit 302 configured to obtain a first open-circuit voltage after the target battery is stabilized, and obtain a first state of charge variation of the target battery, in response to the target battery being discharged for a first predetermined time;
a first battery state of charge obtaining unit 303, configured to calculate and obtain a first battery state of charge corresponding to the first open-circuit voltage according to the full load state and the first state of charge variation;
the state of charge calibration unit 304 is configured to calibrate, according to the first battery state of charge, a first initial state of charge corresponding to the first open circuit voltage in an initial correspondence between the open circuit voltage of the target battery and the battery state of charge.
Optionally, the obtaining the first state of charge variation of the target battery includes:
and calculating and obtaining the change quantity of the charge state of the target battery after the target battery is discharged for a first preset time in a capacity integration mode.
Optionally, the apparatus further includes:
a second state of charge variation obtaining unit configured to obtain a second open-circuit voltage after the target battery is stabilized in response to the target battery being discharged for a second predetermined time, and obtain a second state of charge variation of the target battery;
a second battery state of charge calculation unit, configured to calculate and obtain a second battery state of charge corresponding to the second open-circuit voltage according to the full load state and the second state of charge variation;
and the second initial state of charge calibration unit is used for calibrating the second initial state of charge corresponding to the second open-circuit voltage in the initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the second state of charge of the battery.
Optionally, the apparatus further includes: the device further comprises a recovery unit, a first storage unit and a second storage unit, wherein the recovery unit is used for carrying out standing treatment on the target battery according to preset standing time after the target battery is charged to the full charge cut-off voltage and/or after the target battery is discharged for a first preset time, so that the target battery is recovered to a stable state; or, the target battery is restored to a stable state by performing a cell calibration experiment on the target battery.
Optionally, the apparatus further includes: the preset standing time determining unit is used for determining the preset standing time based on the ambient temperature of the target battery and/or the electrochemical system corresponding to the target battery.
By using the battery state of charge calibration device provided by the embodiment of the application, the OCV-SOC curve can be calibrated spontaneously after the battery is charged to the full charge state in the actual use process of the battery, namely, the OCV-SOC curve can be calibrated automatically in the actual use scene of the battery, the problem of inaccurate SOC calculation caused by continuously using the OCV-SOC curve of the battery in a brand new state under the condition of aging of the battery can be solved, the accuracy of estimating the SOC can be improved by using the calibrated OCV-SOC curve, the SOC calculation accuracy of the battery can be ensured under any degree, the current state of charge of the battery is prevented from being estimated by using the initial OCV-SOC curve of the battery in the brand new state, the inaccurate estimation result of the battery state of charge is avoided, and the problem of inaccurate estimation of the running mileage of an electric vehicle and jump of the running mileage of the electric vehicle is further caused.
In the foregoing embodiments, a battery state of charge calibration method and a battery state of charge calibration apparatus are provided, and in addition, another embodiment of the present application further provides an electronic device, and since the electronic device embodiment is substantially similar to the method embodiment, the description is relatively simple, and details of relevant technical features should be referred to the corresponding description of the method embodiment provided above, and the following description of the electronic device embodiment is merely illustrative. The electronic device embodiment is as follows: fig. 4 is a schematic diagram of an electronic device according to the present embodiment. As shown in fig. 4, the electronic device provided in this embodiment includes: a processor 401 and a memory 402; the memory 402 is used for storing computer instructions for data processing which, when read and executed by the processor 401, perform the following operations:
recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cut-off voltage;
obtaining a first open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a first predetermined time, and obtaining a first state of charge variation of the target battery;
according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage;
and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery.
Optionally, the obtaining the first state of charge variation of the target battery includes: and calculating and obtaining the change quantity of the charge state of the target battery after the target battery is discharged for a first preset time in a capacity integration mode.
Optionally, the method further comprises: obtaining a second open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a second predetermined time, and obtaining a second state of charge variation of the target battery; calculating to obtain a second battery state of charge corresponding to the second open-circuit voltage according to the full-load state and the second state of charge variation; and calibrating a second initial state of charge corresponding to the second open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the second state of charge of the battery.
Optionally, after the target battery is charged to the full charge cutoff voltage and/or after the target battery is discharged for a first predetermined time, the method further includes: performing standing treatment on the target battery according to preset standing time to enable the target battery to be restored to a stable state; or, the target battery is recovered to a stable state by performing a cell calibration experiment on the target battery.
Optionally, the method further comprises: and determining the preset standing time based on the ambient temperature of the target battery and/or the electrochemical system corresponding to the target battery.
By using the electronic equipment provided by the embodiment, the OCV-SOC curve can be calibrated spontaneously after the battery is charged to the full charge state in the actual use process of the battery, namely, the OCV-SOC curve can be calibrated automatically in the actual use scene of the battery, the problem of inaccurate SOC calculation caused by continuously using the OCV-SOC curve of the battery in a brand new state under the condition of aging of the battery can be solved, the accuracy of estimating the SOC can be improved by using the calibrated OCV-SOC curve, the SOC calculation accuracy of the battery in any degree can be ensured, the state of charge of the battery can be prevented from being estimated by using the initial OCV-SOC curve of the battery in the brand new state, the inaccurate estimation result of the state of charge of the battery can be avoided, and the problem of inaccurate estimation of the running mileage of an electric vehicle and the running mileage jump of the electric vehicle can be further caused.
In the above embodiments, a battery state of charge calibration method, a battery state of charge calibration device, and an electronic apparatus are provided, and in addition, a computer readable storage medium for implementing the battery state of charge calibration method is also provided in a sixth embodiment of the present application. The embodiments of the computer readable storage medium provided in the present application are described more simply, and reference should be made to the corresponding descriptions of the above-described method embodiments, the embodiments described below being merely illustrative.
The computer readable storage medium provided in this embodiment stores computer instructions that, when executed by a processor, implement the steps of:
recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cut-off voltage;
obtaining a first open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a first predetermined time, and obtaining a first state of charge variation of the target battery;
according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage;
and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery.
Optionally, the obtaining the first state of charge variation of the target battery includes: and calculating and obtaining the change quantity of the charge state of the target battery after the target battery is discharged for a first preset time in a capacity integration mode.
Optionally, the method further comprises: obtaining a second open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a second predetermined time, and obtaining a second state of charge variation of the target battery; calculating to obtain a second battery state of charge corresponding to the second open-circuit voltage according to the full-load state and the second state of charge variation; and calibrating a second initial state of charge corresponding to the second open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the second state of charge of the battery.
Optionally, after the target battery is charged to the full charge cutoff voltage and/or after the target battery is discharged for a first predetermined time, the method further includes: performing standing treatment on the target battery according to preset standing time to enable the target battery to be restored to a stable state; or, the target battery is recovered to a stable state by performing a cell calibration experiment on the target battery.
Optionally, the method further comprises: and determining the preset standing time based on the ambient temperature of the target battery and/or the electrochemical system corresponding to the target battery.
By executing the computer instructions stored on the computer readable storage medium provided by the embodiment, the OCV-SOC curve can be calibrated spontaneously after the battery is charged to a full charge state in the actual use process of the battery, namely, the OCV-SOC curve can be calibrated automatically in the actual use scene of the battery, the problem of inaccurate SOC calculation caused by continuously using the OCV-SOC curve of the battery in a brand new state under the condition of aging of the battery can be solved, the accuracy of estimating the SOC can be improved by using the calibrated OCV-SOC curve, the SOC calculation precision of the battery can be ensured under any degree of attenuation, the current state of charge of the battery is prevented from being estimated by using the initial OCV-SOC curve of the battery in the brand new state, the estimation result of the battery state of charge is inaccurate, and the problem of inaccurate estimation of the driving mileage of an electric vehicle and trip of the electric vehicle is further caused.
The foregoing embodiments provide a method for acquiring a state of charge of a battery, and correspondingly, another embodiment of the present application further provides a device for acquiring a state of charge of a battery, and since the device embodiment is substantially similar to the method embodiment, the description is relatively simple, and details of relevant technical features should be referred to the corresponding description of the method embodiment provided above, and the following description of the device embodiment is merely illustrative.
Referring to fig. 5 for an understanding of the embodiment, fig. 5 is a block diagram of a battery state of charge acquiring device according to the present embodiment, and as shown in fig. 5, the battery state of charge acquiring device according to the present embodiment includes:
a state of charge recording unit 501, configured to record, in response to a target battery being charged to a full charge cutoff voltage, a state of charge of the target battery after being stabilized as a full load state of charge;
a discharge response unit 502, configured to obtain a current open circuit voltage after the target battery is stabilized and obtain a state of charge variation of the target battery in response to the target battery being discharged to a current time;
and a current state of charge calculation unit 503, configured to calculate and obtain a current state of charge corresponding to the current open circuit voltage according to the full load state and the state of charge variation.
According to the battery state of charge obtaining device provided by the embodiment, the current state of charge corresponding to the current open-circuit voltage of the battery can be accurately calculated and obtained based on the actual use state of the battery after the battery is fully charged, so that the problem that the current state of charge of the battery is estimated by using the initial OCV-SOC curve of the battery in a brand-new state, the estimation result of the state of charge of the battery is inaccurate, the estimation of the driving mileage of the electric automobile is inaccurate, and the driving mileage jump of the electric automobile is generated is avoided.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (f.ash RAM), among other forms in computer readable media. Memory is an example of computer-readable media.
1. Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include non-transitory computer-readable media (trans itory med i a), such as modulated data signals and carrier waves.
2. It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (10)
1. A method for calibrating a state of charge of a battery, comprising:
recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cut-off voltage;
obtaining a first open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a first predetermined time, and obtaining a first state of charge variation of the target battery;
according to the full-load state and the first state-of-charge variation, calculating to obtain a first battery state-of-charge corresponding to the first open-circuit voltage;
and calibrating a first initial state of charge corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the first state of charge of the battery.
2. The method of claim 1, wherein the obtaining the first state of charge variation of the target battery comprises:
and calculating and obtaining the change quantity of the charge state of the target battery after the target battery is discharged for a first preset time in a capacity integration mode.
3. The method as recited in claim 1, further comprising:
obtaining a second open-circuit voltage after the target battery is stabilized in response to the target battery discharging for a second predetermined time, and obtaining a second state of charge variation of the target battery;
calculating to obtain a second battery state of charge corresponding to the second open-circuit voltage according to the full-load state and the second state of charge variation;
and calibrating a second initial state of charge corresponding to the second open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the state of charge of the battery according to the second state of charge of the battery.
4. The method of claim 1, wherein after the target battery is charged to a full charge cutoff voltage and/or after the target battery is discharged for a first predetermined time, further comprising:
performing standing treatment on the target battery according to preset standing time to enable the target battery to be restored to a stable state;
or, the target battery is recovered to a stable state by performing a cell calibration experiment on the target battery.
5. The method as recited in claim 4, further comprising:
and determining the preset standing time based on the ambient temperature of the target battery and/or the electrochemical system corresponding to the target battery.
6. A battery state of charge acquisition method, characterized by comprising:
recording the state of charge of the target battery after being stabilized as a full-load state of charge in response to the target battery being charged to a full-charge cut-off voltage;
responding to the discharging of the target battery to the current time, obtaining the current open-circuit voltage of the target battery after the stabilizing, and obtaining the state of charge variation of the target battery;
and calculating to obtain the current state of charge corresponding to the current open-circuit voltage according to the full-load state and the state of charge variation.
7. The method of claim 6, further comprising, after the target battery is charged to a full charge cutoff voltage and/or after the target battery is discharged to a current time:
performing standing treatment on the target battery according to preset standing time to enable the target battery to be restored to a stable state;
or, the target battery is recovered to a stable state by performing a cell calibration experiment on the target battery.
8. A battery state of charge calibration apparatus, comprising:
the full-load state recording unit is used for responding to the state that the target battery is charged to the full-charge cut-off voltage and recording that the state of charge of the target battery after being stabilized is the full-load state;
a first state-of-charge variation obtaining unit configured to obtain a first open-circuit voltage after the target battery is stabilized, and to obtain a first state-of-charge variation of the target battery, in response to the target battery being discharged for a first predetermined time;
a first battery state of charge obtaining unit, configured to calculate and obtain a first battery state of charge corresponding to the first open-circuit voltage according to the full load state and the first state of charge variation;
and the charge state calibration unit is used for calibrating a first initial charge state corresponding to the first open-circuit voltage in an initial corresponding relation between the open-circuit voltage of the target battery and the charge state of the battery according to the charge state of the first battery.
9. An electronic device comprising a processor and a memory; wherein,
the memory is for storing one or more computer instructions, wherein the one or more computer instructions are executable by the processor to implement the method of any of claims 1-7.
10. A computer readable storage medium having stored thereon one or more computer instructions executable by a processor to implement the method of any of claims 1-7.
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