CN115639484A - Method and device for correcting available capacity of battery - Google Patents
Method and device for correcting available capacity of battery Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000012937 correction Methods 0.000 claims abstract description 39
- 238000002474 experimental method Methods 0.000 claims abstract description 21
- 239000000178 monomer Substances 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 9
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 14
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000010354 integration Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
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- 238000004364 calculation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013211 curve analysis Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Y02E60/10—Energy storage using batteries
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Abstract
The application provides a method and a device for correcting available capacity of a battery, wherein the method comprises the following steps: carrying out a charging experiment on a target battery to obtain a corresponding relation table of actual rated capacity of the battery of the target battery and monomer voltage and electric charge of the target battery; acquiring a voltage threshold of the target battery in a charging working condition and a charge amount threshold corresponding to the voltage threshold according to the corresponding relation table; acquiring real-time voltage and current charge of a target battery through a battery management system; when the real-time voltage reaches a voltage threshold, calculating a charge difference value between the current charge and the charge threshold; judging whether available capacity correction is needed or not according to the charge quantity difference value; if so, the available capacity of the target battery is corrected. Therefore, by implementing the embodiment, the available capacity of the battery can be accurately corrected, so that the estimation precision of the available capacity of the battery is improved.
Description
Technical Field
The application relates to the field of electric automobiles, in particular to a method and a device for correcting available capacity of a battery.
Background
When the lithium iron phosphate battery is estimated, a method combining an ampere-hour integration method and open-circuit voltage correction is usually adopted to estimate the SOC in real time at present. However, lithium iron phosphate batteries have a flat OCV (open circuit voltage) -SOC curve, which makes the currently used method only capable of producing a good correction effect when the battery capacity is near full charge or near full discharge, and thus cannot achieve a correction effect on a flat OCV (open circuit voltage) -SOC curve in a 10% -90% SOC interval, and further inevitably causes a large error, and adversely affects the capacity estimation accuracy of the battery.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for correcting a usable battery capacity, which can accurately correct the usable battery capacity, thereby improving an estimation accuracy of the usable battery capacity.
A first aspect of an embodiment of the present application provides a method for correcting available capacity of a battery, including:
carrying out a charging experiment on a target battery to obtain a battery actual rated capacity of the target battery and a corresponding relation table of a monomer voltage and a charged quantity of the target battery;
acquiring a voltage threshold of the target battery in a charging working condition and a charge threshold corresponding to the voltage threshold according to the corresponding relation table;
acquiring the real-time voltage and the current charge quantity of the target battery through a battery management system;
when the real-time voltage reaches the voltage threshold, calculating a charge difference value between the current charge and the charge threshold;
judging whether available capacity correction is needed or not according to the charge quantity difference value;
and if so, correcting the available capacity of the target battery.
In the implementation process, the method can preferentially carry out a charging experiment on the target battery to obtain the actual rated capacity of the target battery and a corresponding relation table of the monomer voltage and the charge capacity of the target battery; then, acquiring a voltage threshold of the target battery in the charging working condition and a charge threshold corresponding to the voltage threshold according to the corresponding relation table; then, acquiring the real-time voltage and the current charge quantity of the target battery through a battery management system; then, when the real-time voltage reaches a voltage threshold, calculating a charge quantity difference value between the current charge quantity and the charge quantity threshold; finally, judging whether available capacity correction is needed or not according to the difference value of the electric quantity of charge; and when the available capacity correction is required, correcting the available capacity of the target battery. Therefore, the method can accurately correct the available capacity of the battery, so that the estimation precision of the available capacity of the battery is improved.
Further, the performing a charging experiment on the target battery to obtain a corresponding relationship table between the actual rated capacity of the target battery and the cell voltage and the charge capacity of the target battery includes:
performing a C/3 full-charge-discharge cycle test on a target battery to obtain the actual rated capacity of the target battery;
performing constant-rate charging tests on the target battery under different rates to obtain a voltage capacity curve;
processing the voltage capacity curve to obtain a capacity increment curve under different charging multiplying factors;
counting the monomer voltage corresponding to the highest peak value of the capacity increment curve and the charge amount corresponding to the monomer voltage;
and determining a corresponding relation table of the monomer voltage and the charge quantity according to the charging multiplying power.
Further, the obtaining of the voltage threshold of the target battery in the charging condition and the charge threshold corresponding to the voltage threshold according to the correspondence table includes:
in a charging working condition, charging the target battery at a constant rate of a target charging rate;
and determining a voltage threshold corresponding to the target charging multiplying power and a charge amount threshold corresponding to the voltage threshold according to the corresponding relation table.
Further, the obtaining of the real-time voltage and the current charge of the target battery through the battery management system includes:
collecting the real-time voltage of the target battery through a battery management system;
and estimating the current charge quantity according to the real-time voltage through the battery management system.
Further, the determining whether the available capacity needs to be corrected according to the charge capacity difference includes:
acquiring a historical charge difference value of the target battery;
and judging whether available capacity correction is needed or not according to the historical charge quantity difference value and the charge quantity difference value.
A second aspect of the embodiments of the present application provides a battery available capacity correction apparatus, including:
the system comprises an experiment unit, a charging unit and a charging unit, wherein the experiment unit is used for carrying out charging experiments on a target battery to obtain the actual rated capacity of the battery of the target battery and a corresponding relation table of the single voltage and the charged quantity of the target battery;
the first obtaining unit is used for obtaining a voltage threshold value of the target battery in a charging working condition and a charge quantity threshold value corresponding to the voltage threshold value according to the corresponding relation table;
the second acquisition unit is used for acquiring the real-time voltage and the current charge capacity of the target battery through a battery management system;
the calculating unit is used for calculating the difference value of the current charge quantity and the charge quantity threshold when the real-time voltage reaches the voltage threshold;
the judging unit is used for judging whether available capacity correction is needed or not according to the charge quantity difference value;
and a correction unit configured to correct the available capacity of the target battery when it is determined that the available capacity correction is required.
In the implementation process, the device can perform a charging experiment on the target battery through the experiment unit to obtain the actual rated capacity of the target battery and a corresponding relation table of the monomer voltage and the charge capacity of the target battery; acquiring a voltage threshold value of the target battery in the charging working condition and a charge quantity threshold value corresponding to the voltage threshold value according to the corresponding relation table through a first acquisition unit; acquiring real-time voltage and current charge of a target battery through a battery management system by a second acquisition unit; calculating the difference value of the current charge quantity and the charge quantity threshold value when the real-time voltage reaches the voltage threshold value through the calculating unit; judging whether available capacity correction is needed or not according to the charge quantity difference value through a judging unit; and finally, correcting the available capacity of the target battery by the correction unit when the correction unit judges that the available capacity needs to be corrected. Therefore, the method can accurately correct the available capacity of the battery, so that the estimation precision of the available capacity of the battery is improved.
Further, the experimental unit comprises:
the experiment subunit is used for carrying out a C/3 full charge-discharge cycle test on the target battery to obtain the actual rated capacity of the target battery; performing constant-rate charging tests under different rates on the target battery to obtain a voltage capacity curve;
the processing subunit is used for processing the voltage capacity curve to obtain capacity increment curves under different charging multiplying factors;
the counting subunit is used for counting the cell voltage corresponding to the highest peak value of the capacity increment curve and the charge amount corresponding to the cell voltage;
and the first determining subunit is used for determining the corresponding relation table of the monomer voltage and the charge quantity according to the charging multiplying power.
Further, the first acquisition unit includes:
the charging subunit is used for charging the target battery at a constant rate of a target charging rate under a charging working condition;
and the second determining subunit is configured to determine, according to the correspondence table, a voltage threshold corresponding to the target charging magnification and a charge amount threshold corresponding to the voltage threshold.
Further, the second acquisition unit includes:
the acquisition subunit is used for acquiring the real-time voltage of the target battery through a battery management system;
and the estimation subunit is used for estimating the current charge capacity according to the real-time voltage through the battery management system.
Further, the judging unit includes:
the acquisition subunit is used for acquiring the historical charge difference of the target battery;
and the judging subunit is used for judging whether the available capacity correction is required or not according to the historical charge quantity difference value and the charge quantity difference value.
A third aspect of the embodiments of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to make the electronic device execute the method for correcting available battery capacity according to any one of the first aspect of the embodiments of the present application.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, which stores computer program instructions, and when the computer program instructions are read and executed by a processor, the computer program instructions perform the method for correcting available battery capacity according to any one of the first aspect of the embodiments of the present application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of a method for correcting available battery capacity according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a device for correcting available battery capacity according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart illustrating a method for correcting available battery capacity according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for correcting a battery available capacity according to an embodiment of the present invention. The method for correcting the available capacity of the battery comprises the following steps:
s101, performing a C/3 full-charge cycle test on the target battery to obtain the actual rated capacity of the target battery.
In this embodiment, the method can perform a C/3 full charge-discharge cycle test on the battery to determine the actual rated capacity of the battery, until the battery discharge capacity is stable and the results of two adjacent cycles do not differ by ± 2%.
S102, carrying out constant-rate charging tests on the target battery under different rates to obtain a voltage capacity curve.
In this embodiment, the method can perform a constant-rate charge test at different rates on the battery cell subjected to the capacity test.
And S103, processing the voltage capacity curve to obtain a capacity increment curve under different charging multiplying factors.
In this embodiment, the method may process a voltage-capacity curve of a charge test to obtain a capacity increment Δ Q/Δ V for each Δ V change, thereby obtaining a Δ Q/Δ V-V capacity increment curve.
And S104, counting the monomer voltage corresponding to the highest peak value of the capacity increment curve and the charge amount corresponding to the monomer voltage.
And S105, determining a corresponding relation table of the monomer voltage and the charge quantity according to the charging multiplying power.
In this embodiment, the method can count the cell voltage V corresponding to the highest peak of the capacity increment curve under different charging rates 0 And corresponding SOC 0 And forming a corresponding relation table M for obtaining the monomer voltage and the corresponding SOC according to the multiplying power.
And S106, in the charging working condition, carrying out constant-rate charging on the target battery at the target charging rate.
And S107, determining a voltage threshold corresponding to the target charging rate and a charge threshold corresponding to the voltage threshold according to the corresponding relation table.
In this embodiment, in the charging condition, the method charges the battery at a constant rate, and obtains the voltage threshold V corresponding to the charging rate according to the charging rate-cell voltage/SOC correspondence table M obtained by analyzing the above capacity increment curve 1 And corresponding SOC 1 。
And S108, acquiring the real-time voltage of the target battery through the battery management system.
And S109, estimating the current charge amount according to the real-time voltage through a battery management system.
And S110, when the real-time voltage reaches a voltage threshold, calculating a charge difference value between the current charge and the charge threshold.
In this embodiment, the method is used when the battery cell voltage collected in real time by the BMS reaches the voltage threshold V obtained by the table lookup 1 According to the SOC currently estimated by the BMS 2 And SOC obtained by looking up the table 1 Recording the corresponding difference Δ SOC = |) 2 -SOC 1 |。
And S111, acquiring a historical charge difference value of the target battery.
S112, judging whether available capacity correction is needed or not according to the historical charge difference and the charge difference, and if yes, executing a step S113; if not, the flow is ended.
And S113, correcting the available capacity of the target battery.
In this embodiment, in order to avoid SOC correction errors caused by failures such as BMS detection and calculation processing, the method performs a battery SOC correction operation when the peak point voltage threshold V1 of the charging process at the same rate is recorded the same and differs by more than 5% from the SOC value recorded by the BMS two or more times, and records a correction event for debugging analysis.
In this embodiment, the control conditions or parameters of each step are as follows:
(1) and (3) capacity testing: actual rated capacity;
(2) and (3) charging test: battery charging multiplying power, voltage-capacity curve of charging process;
(3) capacity increment curve analysis: interval voltage delta V, delta Q/delta V-V capacity increment curve;
(4) peak voltage and SOC statistics: the battery monomer voltage V0 and the SOC0 corresponding to the peak value of the delta Q/delta V-V capacity increment curve;
(5) voltage and SOC table look-up: battery charging rate, voltage threshold V1 and corresponding SOC1;
(6) recording the SOC: currently estimating SOC2, wherein the deviation value delta SOC = | SOC2-SOC1|;
(7) SOC correction: peak point voltage threshold V1, offset Δ SOC, SOC correction event.
In the present embodiment, fig. 3 shows an exemplary flow diagram of the method.
In this embodiment, the lithium iron phosphate (LiFePO 4) battery has wide applications because of its advantages of good safety, low cost, long life, and the like. A Battery Management System (BMS) is generally used to manage a power battery system in an electric vehicle. In order to ensure the safety of the power battery and the dynamic performance and the service performance of the electric vehicle, the battery management system needs to accurately estimate the state of charge, namely the SOC, of the battery.
In this embodiment, the current estimation method of the battery SOC includes an ampere-hour integration method, an open-circuit voltage method, a neural network estimation method, a kalman filter method, and the like, the open-circuit voltage method requires a long time of standing of the battery pack, and cannot perform real-time detection on the battery on the electric vehicle, the neural network method, the kalman filter method, and the like require more calculation resources, and therefore, the application cost on the battery system is high, and the ampere-hour integration method has a problem that the SOC error is continuously accumulated due to the problems of the accuracy of the current sensor and the sampling frequency. Therefore, in practical engineering application, a method combining an ampere-hour integration method and open-circuit voltage correction is generally adopted to estimate the SOC in real time, but due to a flat OCV (open-circuit voltage) -SOC curve of the lithium iron phosphate battery, the correction significance of ampere-hour integration calculation is not large, and a good correction effect is achieved only when the battery capacity is close to full charge or close to full discharge. In order to solve the problems, the application provides a method for correcting the SOC of a lithium iron phosphate battery based on capacity increment analysis, which can correct the SOC of the battery by using the corresponding relationship between the capacity increment peak value and the SOC of the lithium iron phosphate battery, and can also correct the available capacity (SOC) of the battery in a voltage platform area of the lithium iron phosphate battery, thereby effectively improving the SOC accuracy of the lithium iron phosphate battery, and ensuring the safety of a power battery and the dynamic performance and the service performance of an electric vehicle.
In this embodiment, the execution subject of the method may be a computing device such as a computer and a server, and is not limited in this embodiment.
In this embodiment, an execution subject of the method may also be an intelligent device such as a smart phone and a tablet computer, which is not limited in this embodiment.
It can be seen that, by implementing the method for correcting the available capacity of the battery described in this embodiment, the SOC of the battery can be corrected by using the corresponding relationship between the capacity increment peak value of the lithium iron phosphate battery and the SOC, and the available capacity (SOC) of the battery can also be corrected in the voltage platform area of the lithium iron phosphate battery, so that the SOC accuracy of the lithium iron phosphate battery is effectively improved, and the safety of the power battery, and the dynamic performance and the usability of the electric vehicle are further ensured.
Example 2
Referring to fig. 2, fig. 2 is a schematic structural diagram of a device for correcting available battery capacity according to the present embodiment. As shown in fig. 2, the battery available capacity correction apparatus includes:
the experiment unit 210 is configured to perform a charging experiment on a target battery to obtain a corresponding relationship table between an actual rated capacity of the target battery and a cell voltage and a charge amount of the target battery;
the first obtaining unit 220 is configured to obtain a voltage threshold of the target battery in the charging condition and a charge threshold corresponding to the voltage threshold according to the correspondence table;
a second obtaining unit 230, configured to obtain a real-time voltage and a current charge amount of the target battery through the battery management system;
a calculating unit 240, configured to calculate a charge difference between the current charge and the charge threshold when the real-time voltage reaches the voltage threshold;
a determining unit 250, configured to determine whether available capacity correction is required according to the charge capacity difference;
and a correction unit 260 for correcting the available capacity of the target battery when it is determined that the available capacity correction is necessary.
As an alternative embodiment, the experiment unit 210 includes:
the experiment subunit 211 is configured to perform a C/3 full charge-discharge cycle test on the target battery to obtain an actual rated battery capacity of the target battery; performing constant-rate charging tests on the target battery under different rates to obtain a voltage capacity curve;
a processing subunit 212, configured to process the voltage-capacity curve to obtain a capacity increment curve under different charging magnifications;
a statistic subunit 213, configured to count a cell voltage corresponding to a highest peak of the capacity increment curve and a charge amount corresponding to the cell voltage;
the first determining subunit 214 is configured to determine a correspondence table between the cell voltage and the charge amount according to the charge rate.
As an alternative implementation, the first obtaining unit 220 includes:
the charging electronic unit 221 is used for charging the target battery at a constant rate of the target charging rate under the charging working condition;
the second determining subunit 222 is configured to determine, according to the correspondence table, a voltage threshold corresponding to the target charging rate and a charge amount threshold corresponding to the voltage threshold.
As an alternative implementation, the second obtaining unit 230 includes:
the acquisition subunit 231 is configured to acquire a real-time voltage of the target battery through the battery management system;
and the estimation subunit 232 is configured to estimate the current charge amount according to the real-time voltage through the battery management system.
As an alternative implementation, the determining unit 250 includes:
an obtaining subunit 251, configured to obtain a historical charge difference of the target battery;
and a judging subunit 252, configured to judge whether available capacity correction is needed according to the historical charge amount difference and the charge amount difference.
In the embodiment of the present application, for the explanation of the device for correcting the available capacity of a battery, reference may be made to the description in embodiment 1, and details of this embodiment are not repeated.
It can be seen that, the device for correcting the available capacity of the battery described in this embodiment can correct the SOC of the battery by using the corresponding relationship between the capacity increment peak value of the lithium iron phosphate battery and the SOC, and can also correct the available capacity (SOC) of the battery in the voltage platform area of the lithium iron phosphate battery, so that the SOC accuracy of the lithium iron phosphate battery is effectively improved, and the safety of the power battery, and the dynamic performance and the usability of the electric vehicle are further ensured.
An embodiment of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to make the electronic device execute the method for correcting available battery capacity in embodiment 1 of the present application.
An embodiment of the present application provides a computer-readable storage medium, which stores computer program instructions, and when the computer program instructions are read and executed by a processor, the method for correcting available capacity of a battery according to embodiment 1 of the present application is performed.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method for correcting a usable capacity of a battery, comprising:
carrying out a charging experiment on a target battery to obtain a battery actual rated capacity of the target battery and a corresponding relation table of a monomer voltage and a charged quantity of the target battery;
acquiring a voltage threshold of the target battery in a charging working condition and a charge threshold corresponding to the voltage threshold according to the corresponding relation table;
acquiring the real-time voltage and the current charge quantity of the target battery through a battery management system;
when the real-time voltage reaches the voltage threshold, calculating a charge difference value between the current charge and the charge threshold;
judging whether available capacity correction is needed or not according to the charge quantity difference value;
and if so, correcting the available capacity of the target battery.
2. The method according to claim 1, wherein the performing a charging experiment on the target battery to obtain a corresponding relationship table between an actual rated capacity of the target battery and a cell voltage and a charge amount of the target battery comprises:
performing a C/3 full-charge-discharge cycle test on a target battery to obtain the actual rated capacity of the target battery;
performing constant-rate charging tests on the target battery under different rates to obtain a voltage capacity curve;
processing the voltage capacity curve to obtain a capacity increment curve under different charging multiplying factors;
counting the monomer voltage corresponding to the highest peak value of the capacity increment curve and the charge amount corresponding to the monomer voltage;
and determining a corresponding relation table of the monomer voltage and the charge amount according to the charging multiplying power.
3. The method for correcting the available battery capacity according to claim 1, wherein the obtaining a voltage threshold of the target battery in a charging condition and a charge threshold corresponding to the voltage threshold according to the correspondence table includes:
in a charging working condition, charging the target battery at a constant rate of a target charging rate;
and determining a voltage threshold corresponding to the target charging multiplying power and a charge amount threshold corresponding to the voltage threshold according to the corresponding relation table.
4. The method for correcting available battery capacity according to claim 1, wherein the obtaining of the real-time voltage and the current charge of the target battery through a battery management system comprises:
collecting the real-time voltage of the target battery through a battery management system;
and estimating the current charge quantity according to the real-time voltage through the battery management system.
5. The method for correcting the available capacity of the battery according to claim 1, wherein the determining whether the available capacity needs to be corrected according to the difference of the charged amounts includes:
acquiring a historical charge quantity difference value of the target battery;
and judging whether available capacity correction is needed or not according to the historical charge quantity difference value and the charge quantity difference value.
6. A battery available capacity correction apparatus, characterized by comprising:
the system comprises an experiment unit, a charging unit and a charging unit, wherein the experiment unit is used for carrying out charging experiments on a target battery to obtain the actual rated capacity of the battery of the target battery and a corresponding relation table of the single voltage and the charged quantity of the target battery;
the first obtaining unit is used for obtaining a voltage threshold value of the target battery in a charging working condition and a charge quantity threshold value corresponding to the voltage threshold value according to the corresponding relation table;
the second acquisition unit is used for acquiring the real-time voltage and the current charge capacity of the target battery through a battery management system;
the calculating unit is used for calculating the difference value of the current charge quantity and the charge quantity threshold when the real-time voltage reaches the voltage threshold;
the judging unit is used for judging whether available capacity correction is needed or not according to the charge quantity difference value;
and a correction unit configured to correct the available capacity of the target battery when it is determined that available capacity correction is required.
7. The battery usable capacity correction apparatus according to claim 6, wherein the experiment unit includes:
the experiment subunit is used for carrying out a C/3 full charge-discharge cycle test on the target battery to obtain the actual rated capacity of the target battery; performing constant-rate charging tests on the target battery under different rates to obtain a voltage capacity curve;
the processing subunit is used for processing the voltage capacity curve to obtain capacity increment curves under different charging multiplying factors;
the counting subunit is used for counting the cell voltage corresponding to the highest peak value of the capacity increment curve and the charge amount corresponding to the cell voltage;
and the first determining subunit is used for determining the corresponding relation table of the monomer voltage and the charge quantity according to the charging multiplying power.
8. The battery usable capacity correction apparatus according to claim 6, wherein the first acquisition unit includes:
the charging subunit is used for charging the target battery at a constant rate of a target charging rate under a charging working condition;
and the second determining subunit is configured to determine, according to the correspondence table, a voltage threshold corresponding to the target charging magnification and a charge amount threshold corresponding to the voltage threshold.
9. An electronic device, comprising a memory for storing a computer program and a processor for executing the computer program to cause the electronic device to perform the battery available capacity correction method according to any one of claims 1 to 5.
10. A readable storage medium having stored thereon computer program instructions which, when read and executed by a processor, perform the method of correcting available battery capacity according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211355814.8A CN115639484A (en) | 2022-11-01 | 2022-11-01 | Method and device for correcting available capacity of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211355814.8A CN115639484A (en) | 2022-11-01 | 2022-11-01 | Method and device for correcting available capacity of battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115639484A true CN115639484A (en) | 2023-01-24 |
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