CN112834935A - Method and device for obtaining battery cell open-circuit voltage - Google Patents
Method and device for obtaining battery cell open-circuit voltage Download PDFInfo
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Abstract
The application discloses a method and a device for obtaining the open-circuit voltage of a battery cell, wherein the method comprises the following steps: acquiring a plurality of current values from the dynamic data of the target battery, and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is a first electric quantity ratio; fitting to obtain a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of terminal voltage values; and taking the terminal voltage value corresponding to the current of 0 as the open-circuit voltage of the target battery cell under the first electric quantity ratio. Therefore, the scheme provided by the application obtains the corresponding relation between the current and the voltage in the target battery according to the dynamic data, so that the open-circuit voltage of the battery cell under the target battery capacity ratio is calculated according to the corresponding relation, and the attenuation aging condition of the target battery can be calculated.
Description
Technical Field
The present disclosure relates to the field of power supplies, and in particular, to a method and an apparatus for obtaining an open-circuit voltage of a battery cell.
Background
The open-circuit voltage of the battery cell can be used for calculating the cell impedance of the battery, so that the attenuation aging condition of the battery is obtained. At present, if the open-circuit voltage of a target battery cell needs to be acquired, the target battery needs to be sent into an electrochemical workstation and acquired after the target battery is fully stood by a three-level electrode battery. This method requires that the target battery cell be separately removed from its application device and sent to an electrochemical workstation when measuring its open circuit voltage, consumes a significant amount of time and effort, and would interfere with the proper operation of the battery application device. Therefore, how to simply obtain the target open-circuit voltage of the battery cell without affecting the normal operation of the device in order to obtain the attenuation aging condition of the battery becomes a problem which needs to be solved in the field urgently.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a method and an apparatus for obtaining an open-circuit voltage, which are used for simply obtaining the open-circuit voltage without affecting the normal operation of the apparatus.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides a method for obtaining an open-circuit voltage of a battery cell, which comprises the following steps:
acquiring a plurality of current values from dynamic data of a target battery, and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is a first electric quantity ratio;
fitting to obtain a corresponding relation between the current and the terminal voltage in the target battery according to the current values and the terminal voltage values;
and obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the electric core of the target battery under the first electric quantity ratio.
Optionally, the fitting to obtain the corresponding relationship between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of voltage values includes:
obtaining a scatter diagram of a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of voltage values;
performing linear fitting on the scatter diagram to obtain a linear diagram of the corresponding relation between the current and the terminal voltage in the target battery;
the obtaining of the terminal voltage value corresponding to the current value of 0 according to the corresponding relationship includes:
and obtaining a terminal voltage value corresponding to the current value of 0 according to the linear graph.
Optionally, the obtaining a terminal voltage value when the current is 0 according to the linear graph includes:
and obtaining the intercept of the curve in the linear graph on an axis representing the terminal voltage, wherein the intercept is the terminal voltage value corresponding to the current value of 0.
Optionally, the target battery is applied to a target electric vehicle; the dynamic data of the target battery is provided by a battery management system of the target electric vehicle.
Optionally, characterized in that the method further comprises:
replacing the first charge threshold with a plurality of charge ratios and obtaining an open circuit voltage of the cell of the target battery at the plurality of charge ratios according to the method of any one of claims 1 to 4;
according to the open-circuit voltages under the multiple electric quantity ratios, fitting to obtain a mapping relation between the electric quantity ratios and the open-circuit voltages in the target battery;
and obtaining the open-circuit voltage of the electric core of the target battery in any electric quantity ratio according to the mapping relation.
The embodiment of the present application further provides a device for obtaining the open-circuit voltage of the battery electric core, where the device includes:
the data acquisition module is used for acquiring a plurality of current values from dynamic data of a target battery and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is a first electric quantity ratio;
the fitting module is used for fitting to obtain the corresponding relation between the current and the terminal voltage in the target battery according to the current values and the terminal voltage values;
and the result obtaining module is used for obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the electric core of the target battery under the first electric quantity ratio.
Optionally, the fitting module is specifically configured to:
obtaining a scatter diagram of a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of voltage values;
performing linear fitting on the scatter diagram to obtain a linear diagram of the corresponding relation between the current and the terminal voltage in the target battery;
the obtaining of the terminal voltage value corresponding to the current value of 0 according to the corresponding relationship includes:
and obtaining a terminal voltage value corresponding to the current value of 0 according to the linear graph.
Optionally, the apparatus further comprises:
a first obtaining module, configured to replace the first electric quantity threshold with a plurality of electric quantity ratios, and obtain, according to the apparatus, an open-circuit voltage of the electric core of the target battery at the plurality of electric quantity ratios;
the mapping relation obtaining module is used for fitting to obtain a mapping relation between the electric quantity occupation ratio and the open-circuit voltage in the target battery according to the open-circuit voltages under the plurality of electric quantity occupation ratios;
and the second obtaining module is used for obtaining the open-circuit voltage of the electric core of the target battery in any electric quantity ratio according to the mapping relation.
The embodiment of the application also provides equipment for obtaining the open-circuit voltage of the battery cell, which comprises a processor and a memory; the memory is used for storing a computer program; the processor is used for executing the method for obtaining the battery cell open-circuit voltage according to the computer program.
An embodiment of the present application further provides a computer-readable storage medium, configured to store a computer program, where the computer program is executed by a processor to perform the above method for obtaining an open-circuit voltage of a battery cell.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a method and a device for obtaining an open-circuit voltage of a battery cell, wherein the method comprises the following steps: acquiring a plurality of current values from the dynamic data of the target battery, and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is a first electric quantity ratio; fitting to obtain a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of terminal voltage values; and obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the target battery cell under the first electric quantity ratio.
Therefore, according to the method provided by the application, the terminal voltage values corresponding to the current values of the target battery are obtained through the dynamic data measurable by the target battery, the corresponding relation between the current and the voltage in the target battery is obtained, and the open-circuit voltage of the battery cell under the target battery electric quantity ratio is calculated according to the corresponding relation. Therefore, according to the method provided by the embodiment of the application, under the condition that the normal operation of the device applied to the battery is not influenced, the open-circuit voltage of the target battery cell is obtained according to the dynamic data of the battery, so that the attenuation aging condition of the target battery can be calculated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for obtaining an open-circuit voltage of a battery cell according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an apparatus for obtaining an open-circuit voltage of a battery cell according to an embodiment of the present application.
Detailed Description
In order to help better understand the scheme provided by the embodiment of the present application, before describing the method provided by the embodiment of the present application, a scenario of an application of the scheme of the embodiment of the present application is described.
The open-circuit voltage of the battery cell can be used for calculating the cell impedance of the battery, so that the attenuation aging condition of the battery is obtained. At present, if the open-circuit voltage of a target battery cell needs to be acquired, the target battery needs to be sent into an electrochemical workstation and acquired after the target battery is fully stood by a three-level electrode battery. This method requires that the target battery cell be separately removed from its application device and sent to an electrochemical workstation when measuring its open circuit voltage, consumes a significant amount of time and effort, and would interfere with the proper operation of the battery application device. Therefore, how to simply obtain the target open-circuit voltage of the battery cell without affecting the normal operation of the device in order to obtain the attenuation aging condition of the battery becomes a problem which needs to be solved in the field urgently.
In order to solve the above technical problem, an embodiment of the present application provides a method for obtaining an open-circuit voltage of a battery cell, where the method includes: acquiring a plurality of current values from the dynamic data of the target battery, and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is a first electric quantity ratio; fitting to obtain a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of terminal voltage values; and obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the target battery cell under the first electric quantity ratio.
Therefore, according to the method provided by the application, the terminal voltage values corresponding to the current values of the target battery are obtained through the dynamic data measurable by the target battery, the corresponding relation between the current and the voltage in the target battery is obtained, and the open-circuit voltage of the battery cell under the target battery electric quantity ratio is calculated according to the corresponding relation. Therefore, according to the method provided by the embodiment of the application, under the condition that the normal operation of the device applied to the battery is not influenced, the open-circuit voltage of the target battery cell is obtained according to the dynamic data of the battery, so that the attenuation aging condition of the target battery can be calculated.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
Referring to fig. 1, the figure is a schematic flow chart of a method for obtaining an open-circuit voltage of a battery cell according to an embodiment of the present disclosure. As shown in fig. 1, a method for obtaining an open-circuit voltage of a battery cell provided in an embodiment of the present application includes the following steps S101 to S103:
s101: and acquiring a plurality of current values from the dynamic data of the target battery, and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is the first electric quantity ratio.
S102: and fitting to obtain the corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of terminal voltage values.
S103: and obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the electric core of the target battery under the first electric quantity ratio.
It should be noted that, in the embodiment of the present application, in order to improve the accuracy of the obtained open-circuit voltage, a plurality of terminal voltage values corresponding to a plurality of current values when the electric quantity occupancy of the target battery is the first electric quantity occupancy are obtained. Therefore, the electric quantity ratio of the obtained multiple current values and the electric quantity corresponding to the multiple terminal voltage values is a fixed value, the corresponding relation of the current and the terminal voltage in the target battery is stable, and the accuracy of the open-circuit voltage obtained by the scheme provided by the embodiment of the application is improved.
In the present embodiment, when the battery is discharged, the load is an external circuit, and the terminal voltage is an external circuit load voltage. When the battery is charged, the load is the inside of the battery core, and the terminal voltage is the open-circuit voltage of the battery core plus the self-load voltage of the battery core. In the embodiment of the present application, in order to better fit the correspondence relationship between the current and the terminal voltage in the target battery, the plurality of current values may be a plurality of current values that are uniformly distributed within a preset current range. Of course, the plurality of current values may be current values obtained according to other preset conditions as the dynamic data of the battery changes.
Step S102 in the embodiment of the present application is described in detail below:
in the embodiment of the present application, in order to make the corresponding relationship between the current and the terminal voltage obtained by fitting more accurate, as a possible implementation manner, step S102: according to the plurality of current values and the plurality of voltage values, fitting to obtain a corresponding relation between the current and the terminal voltage in the target battery, which may be: obtaining a scatter diagram of a corresponding relationship between a current and a terminal voltage in the target battery from the plurality of current values and the plurality of voltage values; and performing linear fitting on the scatter diagram to obtain a linear diagram of the corresponding relation between the current and the terminal voltage in the target battery. At this time, obtaining the terminal voltage value corresponding to the current value of 0 according to the corresponding relationship includes: and obtaining a terminal voltage value corresponding to the current value of 0 according to the linear graph. Further, in the embodiment of the present application, obtaining the terminal voltage value when the current is 0 according to the linear graph includes: obtaining the intercept of the curve on the axis representing the terminal voltage in the linear graph; the intercept is a terminal voltage value corresponding to a current value of 0.
As a possible implementation manner, in the implementation of the present application, in order to reduce the cost of acquiring the dynamic data of the target battery when the target battery is applied to the target electric vehicle, the dynamic data of the target battery in the embodiment of the present application may be directly provided by the battery management system of the target electric vehicle. Therefore, the method provided by the embodiment of the application does not need additional measuring equipment, but is directly obtained by measuring through the battery management system of the target battery, and the cost for obtaining the dynamic data of the target battery is reduced. Of course, the dynamic data of the target battery in the embodiment of the present application may also be obtained by measurement of other devices.
As a possible implementation manner, in order to make the estimation of the degradation condition of the target battery more accurate, the method provided in the embodiment of the present application may further include: replacing the first electric quantity threshold value with a plurality of electric quantity ratios, and obtaining the open-circuit voltage of the target battery cell under the plurality of electric quantity ratios according to the method for obtaining the open-circuit voltage of the battery cell; according to the open-circuit voltages under the multiple electric quantity occupation ratios, fitting to obtain a mapping relation between the electric quantity occupation ratio and the open-circuit voltage in the target battery; and obtaining the open-circuit voltage of the target battery cell in any electric quantity ratio according to the mapping relation. Therefore, the method provided by the embodiment of the application can obtain the open-circuit voltage in any electric quantity ratio, so that richer data for evaluating the battery are obtained, and the attenuation aging condition of the target battery is more accurately calculated by the embodiment of the application.
Therefore, according to the method provided by the application, the terminal voltage values corresponding to the current values of the target battery are obtained through the dynamic data measurable by the target battery, and the corresponding relation between the current and the voltage in the target battery is obtained, so that the open-circuit voltage of the battery cell under the target battery electric quantity ratio is calculated according to the corresponding relation. Therefore, according to the method provided by the embodiment of the application, under the condition that the normal operation of the device applied to the battery is not influenced, the open-circuit voltage of the target battery cell is obtained according to the dynamic data of the battery, so that the attenuation aging condition of the target battery can be calculated.
According to the method for obtaining the open-circuit voltage of the battery cell provided by the embodiment, the embodiment of the application further provides a device for obtaining the open-circuit voltage of the battery cell. Referring to fig. 2, it is a schematic structural diagram of an apparatus for obtaining an open-circuit voltage of a battery cell according to an embodiment of the present disclosure. As shown in fig. 2, an apparatus for obtaining an open-circuit voltage of a battery cell provided in an embodiment of the present application includes:
the data obtaining module 100 is configured to obtain a plurality of current values from the dynamic data of the target battery, and obtain a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is the first electric quantity ratio. And a fitting module 200, configured to fit the current values and the terminal voltage values to obtain a corresponding relationship between the current and the terminal voltage in the target battery. And a result obtaining module 300, configured to obtain, according to the corresponding relationship, a terminal voltage value corresponding to the current value being 0, and use the terminal voltage value corresponding to the current value being 0 as an open-circuit voltage of the target battery cell in the first electric quantity ratio.
As a possible implementation manner, the fitting module in the embodiment of the present application is specifically configured to: obtaining a scatter diagram of a corresponding relationship between a current and a terminal voltage in the target battery from the plurality of current values and the plurality of voltage values; and performing linear fitting on the scatter diagram to obtain a linear diagram of the corresponding relation between the current and the terminal voltage in the target battery. At this time, the obtaining of the terminal voltage value corresponding to the current value of 0 according to the corresponding relationship in the embodiment of the present application includes: and obtaining a terminal voltage value corresponding to the current value of 0 according to the linear graph.
As a possible implementation manner, in the present application example, the target battery is applied to a target electric vehicle; the dynamic data of the target battery is provided by a battery management system of the target electric vehicle.
As a possible implementation, the apparatus in the embodiment of the present application further includes: a first obtaining module, configured to replace the first electric quantity threshold with a plurality of electric quantity ratios, and obtain an open-circuit voltage of the target battery cell at the plurality of electric quantity ratios according to all or part of the steps of the method for obtaining an open-circuit voltage of the battery cell provided in the foregoing embodiment; the mapping relation obtaining module is used for fitting to obtain a mapping relation between the electric quantity ratio and the open-circuit voltage in the target battery according to the open-circuit voltages under the plurality of electric quantity ratios; and the second obtaining module is used for obtaining the open-circuit voltage of the target battery cell in any electric quantity ratio according to the mapping relation.
Therefore, according to the method provided by the application, the terminal voltage values corresponding to the current values of the target battery are obtained through the dynamic data measurable by the target battery, and the corresponding relation between the current and the voltage in the target battery is obtained, so that the open-circuit voltage of the battery cell under the target battery electric quantity ratio is calculated according to the corresponding relation. Therefore, according to the method provided by the embodiment of the application, under the condition that the normal operation of the device applied to the battery is not influenced, the open-circuit voltage of the target battery cell is obtained according to the dynamic data of the battery, so that the attenuation aging condition of the target battery can be calculated.
Based on the vehicle running track prediction method and device provided by the foregoing embodiments, correspondingly, the present application further provides an apparatus for obtaining an open-circuit voltage of a battery electric core, which is characterized by comprising a processor and a memory; the memory is used for storing a computer program; the processor is used for executing part or all of the steps of the method for obtaining the open-circuit voltage of the battery cell according to the computer program.
In addition, this implementation also provides a computer-readable storage medium, which is used to store a computer program, where the computer program is executed by a processor to perform some or all of the steps in the method for obtaining an open-circuit voltage of a battery cell provided in the method embodiments.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing description of the disclosed embodiments will enable those skilled in the art to make or use the invention in various modifications to these embodiments, which will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of obtaining a battery cell open circuit voltage, the method comprising:
acquiring a plurality of current values from dynamic data of a target battery, and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity ratio of the target battery is a first electric quantity ratio;
fitting to obtain a corresponding relation between the current and the terminal voltage in the target battery according to the current values and the terminal voltage values;
and obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the electric core of the target battery under the first electric quantity ratio.
2. The method of claim 1, wherein said fitting a correspondence between a current and a terminal voltage in said target battery from said plurality of current values and said plurality of voltage values comprises:
obtaining a scatter diagram of a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of voltage values;
performing linear fitting on the scatter diagram to obtain a linear diagram of the corresponding relation between the current and the terminal voltage in the target battery;
the obtaining of the terminal voltage value corresponding to the current value of 0 according to the corresponding relationship includes:
and obtaining a terminal voltage value corresponding to the current value of 0 according to the linear graph.
3. The method of claim 2, wherein obtaining the terminal voltage value at a current of 0 from the linear graph comprises:
and obtaining the intercept of the curve in the linear graph on an axis representing the terminal voltage, wherein the intercept is the terminal voltage value corresponding to the current value of 0.
4. The method of claim 1, wherein the target battery is applied to a target electric vehicle; the dynamic data of the target battery is provided by a battery management system of the target electric vehicle.
5. The method according to any one of claims 1 to 4, further comprising:
replacing the first charge threshold with a plurality of charge ratios and obtaining an open circuit voltage of the cell of the target battery at the plurality of charge ratios according to the method of any one of claims 1 to 4;
according to the open-circuit voltages under the multiple electric quantity ratios, fitting to obtain a mapping relation between the electric quantity ratios and the open-circuit voltages in the target battery;
and obtaining the open-circuit voltage of the electric core of the target battery in any electric quantity ratio according to the mapping relation.
6. An apparatus for obtaining an open circuit voltage of a battery cell, the apparatus comprising:
the data acquisition module is used for acquiring a plurality of current values from dynamic data of a target battery and acquiring a plurality of terminal voltage values corresponding to the plurality of current values when the electric quantity of the target battery is in a first electric quantity ratio;
the fitting module is used for fitting to obtain the corresponding relation between the current and the terminal voltage in the target battery according to the current values and the terminal voltage values;
and the result obtaining module is used for obtaining a terminal voltage value corresponding to the current value of 0 according to the corresponding relation, and taking the terminal voltage value corresponding to the current value of 0 as the open-circuit voltage of the electric core of the target battery under the first electric quantity ratio.
7. The apparatus of claim 6, wherein the fitting module is specifically configured to:
obtaining a scatter diagram of a corresponding relation between the current and the terminal voltage in the target battery according to the plurality of current values and the plurality of voltage values;
performing linear fitting on the scatter diagram to obtain a linear diagram of the corresponding relation between the current and the terminal voltage in the target battery;
the obtaining of the terminal voltage value corresponding to the current value of 0 according to the corresponding relationship includes:
and obtaining a terminal voltage value corresponding to the current value of 0 according to the linear graph.
8. The apparatus of claim 6 or 7, further comprising:
a first obtaining module, configured to replace the first power threshold with a plurality of power ratios, and obtain an open-circuit voltage of the cell of the target battery at the plurality of power ratios according to the apparatus of claim 6 or 7;
the mapping relation obtaining module is used for fitting to obtain a mapping relation between the electric quantity occupation ratio and the open-circuit voltage in the target battery according to the open-circuit voltages under the plurality of electric quantity occupation ratios;
and the second obtaining module is used for obtaining the open-circuit voltage of the electric core of the target battery in any electric quantity ratio according to the mapping relation.
9. The equipment for obtaining the open-circuit voltage of the battery cell is characterized by comprising a processor and a memory; the memory is used for storing a computer program; the processor is configured to execute the method for obtaining a battery cell open circuit voltage according to any one of claims 1 to 5 according to the computer program.
10. A computer-readable storage medium for storing a computer program which, when executed by a processor, performs the method of obtaining a battery cell open circuit voltage according to any one of claims 1 to 5.
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