CN112964999B - Battery state of charge acquisition method, device, equipment, medium and program product - Google Patents
Battery state of charge acquisition method, device, equipment, medium and program product Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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Abstract
The method corrects the corresponding relation between the state of charge and the open-circuit voltage of the battery in the interval by acquiring the open-circuit voltage of the battery and setting a correction voltage interval in advance to obtain the accurate corresponding relation between the state of charge and the open-circuit voltage of the battery, so that the state of charge of the battery can be acquired under different environments, the safety and reliability of the battery are improved, and the service life of the battery is prolonged.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, a device, a computer-readable storage medium, and a computer program product for acquiring a state of charge of a battery.
Background
The state of charge (SOC) of a battery refers to the ratio of the current charge of the battery to the charge of the battery in a fully charged state, and is usually expressed by percentage, and the value is between 0 and 1, SOC =0 indicates that the battery is in a fully discharged state, and SOC =1 indicates that the battery is in a fully charged state. The state of charge is an important index of the battery, and the accurate acquisition of the state of charge of the battery affects the service life of the battery and further affects the power performance and the safety performance of an electric vehicle using the battery.
Voltage methods are typically used for battery state of charge acquisition and require accurate state of charge-open circuit voltage curves in conjunction with battery manufacturer provided charging and discharging. However, the state-of-charge-open circuit voltage curve provided by the manufacturer is often not accurate enough to affect the state-of-charge acquisition of the battery.
Therefore, there is a need for an accurate method for obtaining the state of charge of the battery.
Disclosure of Invention
The application provides a battery state of charge acquisition method. According to the method, the corresponding relation between the charge state and the open-circuit voltage is accurately obtained by correcting the charge state-open-circuit voltage curve of the battery, so that the charge state of the battery is obtained according to the corresponding relation reflected by the curve, the requirement for obtaining the charge state of the battery under different charging environments is met, and the service life of the battery is further prolonged. The application also provides a device, equipment, a computer readable storage medium and a computer program product corresponding to the method.
In a first aspect, the present application provides a method for acquiring a state of charge of a battery, including:
acquiring the open-circuit voltage of the battery;
acquiring the state of charge of the battery by using the corresponding relation curve of the state of charge corrected by the battery and the open-circuit voltage, wherein the corresponding relation curve of the state of charge corrected by the battery and the open-circuit voltage is acquired by the following method:
acquiring the end-of-platform-period charge state of the battery in a corresponding relation curve of the charge state and the open-circuit voltage of the battery, and taking the terminal voltage corresponding to the end-of-platform-period charge state as the starting point of a voltage correction interval;
the method comprises the steps of taking a charge cut-off voltage value of voltage as an end point of a correction voltage interval, determining a plurality of correction voltage nodes in the correction voltage interval, obtaining the charge states corresponding to different temperatures and different currents under different correction voltage nodes through battery test, correcting a corresponding relation curve of the charge state and the open-circuit voltage of a battery, and obtaining the corresponding relation curve of the charge state and the open-circuit voltage after correction.
In some possible implementations, the obtaining a state of charge at the end of a plateau period of the battery in a corresponding relationship curve between the state of charge and the open-circuit voltage of the battery, and using a terminal voltage corresponding to the state of charge at the end of the plateau period as a starting point of the voltage correction interval includes:
acquiring the charge state of the battery at the end of the platform period in the corresponding relation curve of the charge state and the open-circuit voltage of the battery;
through battery test, acquiring terminal voltages corresponding to the end-of-platform-period charge states at different temperatures and different currents;
and when the charging temperature and the current of the battery are determined, the terminal voltage corresponding to the charge state of the battery with the end of the plateau period is used as the starting point of the correction voltage interval.
In some possible implementations, the charge cutoff voltage value of the voltage is obtained by a manual of the battery.
In some possible implementations, determining a plurality of modified voltage nodes in a modified voltage interval includes:
in the correction voltage interval, N correction voltage nodes are arranged, wherein N is larger than 1;
determining the voltage difference between two adjacent correction voltage nodes according to the N correction voltage nodes;
n voltage nodes are determined from the voltage difference.
In some possible implementations, obtaining the corrected state of charge versus open circuit voltage includes:
and connecting the end point of the corrected voltage interval with the (N + 1) th voltage node to obtain a corresponding relation curve of the corrected charge state and the open-circuit voltage, wherein the voltage at two ends of the (N + 1) th voltage node is equal to the voltage value of the interval end point, and the (N + 1) th voltage node corresponds to the charge state to be 1.
In some possible implementations, the battery includes a lithium iron phosphate battery.
In a second aspect, the present application provides a battery state of charge acquisition apparatus, comprising:
the open-circuit voltage acquisition module is used for acquiring the open-circuit voltage of the battery;
the state of charge acquisition module is used for acquiring the state of charge of the battery by utilizing a corresponding relation curve of the state of charge and the open-circuit voltage after the battery is corrected, and the corresponding relation of the state of charge and the open-circuit voltage after the battery is corrected is acquired by the following method:
acquiring the end-of-platform-period charge state of the battery in a corresponding relation curve of the charge state and the open-circuit voltage of the battery, and taking the terminal voltage corresponding to the end-of-platform-period charge state as the starting point of a voltage correction interval;
the method comprises the steps of taking a charge cut-off voltage value of voltage as an end point of a correction voltage interval, determining a plurality of correction voltage nodes in the correction voltage interval, obtaining the charge states corresponding to different temperatures and different currents under different correction voltage nodes through battery test, correcting a corresponding relation curve of the charge state and the open-circuit voltage of a battery, and obtaining the corresponding relation curve of the charge state and the open-circuit voltage after correction.
In some possible implementation manners, acquiring a state of charge at the end of a plateau period of the battery in a corresponding relation curve between the state of charge of the battery and an open-circuit voltage, and using a terminal voltage corresponding to the state of charge at the end of the plateau period as a starting point of the correction voltage interval includes:
acquiring the charge state of the battery at the end of the platform period in the corresponding relation curve of the charge state and the open-circuit voltage of the battery;
through battery testing, acquiring terminal voltages corresponding to the end-of-platform charge states at different temperatures and different currents;
and when the charging temperature and the current of the battery are determined, the open-circuit voltage corresponding to the state of charge of the battery with the end of the plateau period is used as the starting point of the correction voltage interval.
In some possible implementations, the charge cutoff voltage value of the voltage is obtained by a manual of the battery.
In some possible implementations, determining a plurality of modified voltage nodes in a modified voltage interval includes:
in the correction voltage interval, N correction voltage nodes are arranged, wherein N is larger than 1;
determining the voltage difference between two adjacent correction voltage nodes according to the N correction voltage nodes;
and determining N voltage nodes according to the voltage difference.
In some possible implementations, obtaining the corrected state of charge versus open circuit voltage includes:
and connecting the end point of the corrected voltage interval with the (N + 1) th voltage node to obtain a corresponding relation curve of the corrected charge state and the open-circuit voltage, wherein the voltage at two ends of the (N + 1) th voltage node is equal to the voltage value of the interval end point, and the (N + 1) th voltage node corresponds to the charge state to be 1.
In some possible implementations, the battery includes a lithium iron phosphate battery.
In a third aspect, an apparatus is provided that includes a processor and a memory. The processor and the memory communicate with each other. The processor is configured to execute instructions stored in the memory to cause the apparatus to perform the method of obtaining battery state of charge as in the first aspect or any implementation manner of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and the instructions instruct an apparatus to perform the method for acquiring a state of charge of a battery according to the first aspect or any implementation manner of the first aspect.
In a fifth aspect, the present application provides a computer program product comprising instructions which, when run on an apparatus, cause the apparatus to perform the method for battery state of charge acquisition described above in the first aspect or any implementation manner of the first aspect.
The present application can further combine to provide more implementations on the basis of the implementations provided by the above aspects.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a method for acquiring the state of charge of a battery, which is characterized in that the corresponding relation between the state of charge and the open-circuit voltage of the battery in a section is corrected by acquiring the open-circuit voltage of the battery and setting a correction voltage section in advance to obtain the accurate corresponding relation between the state of charge and the open-circuit voltage of the battery, so that the state of charge of the battery can be acquired under different environments, the safety and the reliability of the battery are improved, and the service life of the battery is prolonged.
Drawings
In order to more clearly illustrate the technical method of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive labor.
Fig. 1 is a schematic flowchart of a method for acquiring a state of charge of a battery according to an embodiment of the present disclosure;
fig. 2 is a MAP of a starting point of a correction voltage interval, temperature and current provided in an embodiment of the present application;
FIG. 3 is a MAP graph of state of charge and temperature, current and terminal voltage provided by an embodiment of the present application;
fig. 4 is a flowchart of a modified corresponding relationship curve between the state of charge and the open-circuit voltage according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a device for acquiring a state of charge of a battery according to an embodiment of the present disclosure.
Detailed Description
The scheme in the embodiments provided in the present application will be described below with reference to the drawings in the present application.
The terms "first", "second" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying any indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Some technical terms referred to in the embodiments of the present application will be first described.
Open Circuit Voltage (OCV) refers to a terminal voltage of a battery in an open circuit state, and it is generally considered that after the battery is charged and discharged, after a long time of standing, the battery has eliminated polarization influence and reaches a stable state, and at this time, voltages at two ends of the battery are open circuit voltages.
However, the corresponding relation between the state of charge and the open-circuit voltage of the battery is difficult to obtain, and the corresponding relation is usually obtained by drawing a corresponding relation curve (SOC-OCV curve) between the state of charge and the open-circuit voltage of the battery during charging, but the curve obtained by the method is not accurate enough, so that the accuracy of obtaining the state of charge of the battery according to the open-circuit voltage of the battery is influenced.
In view of the above, the present application provides an accurate battery state of charge acquisition method. The method may be performed by a processing device. The processing device is a device having a data processing capability, and may be, for example, a server, or a terminal device such as a desktop computer, a notebook computer, or a smart phone.
Specifically, the processing device acquires an open-circuit voltage of the battery, and acquires the state of charge of the battery by using the corrected corresponding relationship curve between the state of charge and the open-circuit voltage. The corrected corresponding relation curve of the state of charge and the open-circuit voltage is obtained by the following method:
the method comprises the steps of obtaining a corresponding relation curve of the state of charge and the open-circuit voltage of a battery, taking a voltage value corresponding to the state of charge with the end of a plateau period in the curve as the starting point of a correction voltage interval, taking a charge cut-off voltage value of voltage as the end point of the correction voltage interval, determining a plurality of correction voltage nodes in the interval, obtaining the states of charge corresponding to different temperatures and different currents through battery testing, correcting the correction nodes respectively, and obtaining the corresponding relation curve of the corrected state of charge and the open-circuit voltage.
In order to facilitate understanding of the technical solution of the present application, a method for obtaining a state of charge of a battery provided by the present application is described below with reference to fig. 1.
Referring to the flowchart of the battery state of charge acquisition method shown in fig. 1, the specific steps of the method are as follows.
S102: the processing device obtains an open circuit voltage of the battery.
The state of charge of the battery cannot be directly obtained generally, so the state of charge of the battery is indirectly obtained by obtaining the open-circuit voltage of the battery and a corresponding relation curve of the state of charge of the battery and the open-circuit voltage by adopting a voltage method.
The open circuit voltage of the battery may be directly measured by a voltmeter, which includes a magnetoelectric voltmeter and a digital voltmeter. Specifically, the positive electrode and the negative electrode of the voltmeter are respectively connected with the positive electrode and the negative electrode of the battery, so that the open-circuit voltage of the battery can be directly read out on the voltmeter.
S104: and the processing equipment acquires the state of charge of the battery by using the corresponding relation curve of the state of charge and the open-circuit voltage after the battery is corrected.
In this embodiment, the corrected accurate corresponding relationship curve is obtained by correcting the corresponding relationship curve of the state of charge and the open-circuit voltage of the battery, so that the accurate state of charge of the battery can be obtained.
The corresponding relation curve of the state of charge and the open-circuit voltage after the battery correction is obtained in the following mode.
S1042: the processing equipment acquires the charge state of the battery at the end of the plateau period in the corresponding relation curve of the charge state and the open-circuit voltage of the battery, and takes the terminal voltage corresponding to the charge state at the end of the plateau period as the starting point of the voltage correction interval.
Plateau refers to a curve in which the ordinate is relatively constant as the abscissa changes, thus forming a segment of a curve similar to a "plateau". In general, the middle part of a corresponding relation curve between the state of charge and the open circuit of the battery is relatively flat, the deviation value of the open circuit voltage corresponding to different states of charge is relatively small, and the battery has a plateau period. Therefore, the terminal voltage corresponding to the state of charge at the end of the plateau period can be selected and used as the starting point of the voltage correction interval. Typically, the state of charge at the end of the plateau is around 0.8.
Specifically, the end-of-platform state-of-charge may be recorded as SOC strt Charging tests are carried out on the battery at different temperatures and different currents, and the state of charge of the battery is recorded to reach SOC strt The temperature, current and terminal voltage at the time are used to obtain the state of charge to the SOC strt With respect to different temperatures andterminal voltage data of different currents, and recording the terminal voltage data at the time as U strt As a starting point of the correction voltage interval. As shown in fig. 2, the temperature, current, and terminal voltage at the time when the state of charge reaches SOC0 can be stored by creating a MAP (MAP) 1. The mapping table is a set with a key/value (key/value) structure, and can be quickly read by quickly acquiring, deleting and updating key/value pair functions through keys.
The terminal voltage of the battery is not necessarily the same in value at different temperatures and currents, but when the temperature and current are determined, the terminal voltage of the battery is determined.
In some possible implementation manners, the open-circuit voltage corresponding to the state of charge at the end of the plateau period in the obtained corresponding relationship curve between the state of charge of the battery and the open-circuit voltage may also be used as the starting point of the voltage correction interval, which is not limited herein.
S1044: the processing equipment takes the charge cut-off voltage value of the battery as the end point of a correction voltage interval, determines a plurality of correction voltage nodes in the correction voltage interval, obtains the charge states corresponding to different temperatures and different currents under different correction voltage nodes through battery testing, corrects the corresponding relation curve of the charge state and the open-circuit voltage of the battery, and obtains the corresponding relation curve of the charge state and the open-circuit voltage after correction.
The processing equipment takes the charging cut-off voltage value of the battery as the terminal point U of the correction voltage interval stp Thereby, a correction voltage interval can be obtained. The charging cut-off voltage value of the battery can be acquired through a battery cell manual.
In the correction voltage region [ U strt ，U stp ]In the case where the start-end point is not included, N correction voltage nodes may be included, and thus, N +1 sub correction voltage intervals may be provided.
The correction voltage nodes can be set according to the cost of battery testing, a large amount of testing time and labor cost are needed to be spent on the correction voltage nodes with a large number, and meanwhile, the charge state correction frequency during charging can be increased by the voltage nodes with a large number, so that the charge state precision is improved, and therefore the number of the correction voltage nodes can be comprehensively determined based on the precision requirement and the battery testing cost.
Can pass through U strt 、U stp And the number of the sub correction intervals can determine the value of each correction voltage node under the condition that each correction voltage node is uniformly distributed.
Wherein the length of each sub-correction voltage interval Δ U = (U) stp -U strt )/(N+1)。
Thus, the first voltage node value is U1= U strt + Δ U; the second voltage node value is U1= Ustrt +2 Δ U; a third voltage node value of U1= U strt +3 Δ U, \8230;, nth voltage node value UN = U strt +NΔU。
In some possible implementations, the correction voltage nodes may also be unevenly distributed, and the unevenly distributed correction voltage nodes may be set according to a trend in the specifically obtained correspondence graph.
Testing the battery according to different correction voltage nodes, charging the battery with constant current, and when the terminal voltage reaches U 1 At that time, the SOC value SOC at that time is recorded 1 (ii) a Continuing constant-current charging when the terminal voltage reaches U 2 At that time, the SOC value SOC at that time is recorded 2 (ii) a Constant current charging is continued when the terminal voltage reaches U 3 Then, the SOC value SOC at this time is recorded 3 823060; \ 8230; until the terminal voltage reaches U stp At that time, the SOC value SOC at that time is recorded stp And the battery ends the constant current charging process. As shown in fig. 3, a MAP (MAP) 2 of the state of charge versus current, temperature and terminal voltage of the battery is established.
In the correction of the sub-node, the full charge condition is not reached, so the state of charge can be corrected even if the sub-node is not fully charged, the flexibility of correction is improved, and the efficiency of correction is improved.
Charging is continued, and the battery enters a constant voltage charging stage, at which time the battery is still in a charging state and the charging current is small, generally less than 0.02C, until the state of charge of the voltage is 1.
According to mapping table 1 and mapAnd the corresponding relation curve of the state of charge and the open-circuit voltage of the battery which is subjected to constant-current charging at a certain temperature is corrected by the firing table 2. Specifically, the start point of the correction voltage interval is obtained by looking up the MAP table 1 with temperature and current, and then the correction voltage nodes in the correction voltage interval are corrected separately by looking up the MAP table 2. Until the battery finishes the constant current charging process, the constant voltage charging process is started, and the final voltage value of the battery is U stp The state of charge is 1.
In this way, the SOC-OCV curve of the battery can be corrected to obtain a more accurate SOC-OCV curve, and optionally, the correction process is as shown in fig. 4, and the correction can be performed based on different currents, so that the requirements of charging at different powers can be met. And the setting of the correction voltage node is flexible, and can be comprehensively considered according to cost and requirements.
In summary, the present application provides a method for acquiring a state of charge of a battery, the method acquires the state of charge of the battery by acquiring an open-circuit voltage of the battery according to a corrected corresponding relationship curve of the state of charge of the battery and the open-circuit voltage, wherein a starting point of a correction interval in the corrected corresponding relationship curve of the state of charge of the battery and the open-circuit voltage is a terminal voltage corresponding to a state of charge at the end of a plateau period in the corresponding relationship curve of the state of charge of the battery and the open-circuit voltage, and an end point of the correction interval is a charge cut-off voltage.
Therefore, the corresponding charge state under any voltage can be obtained, and the corresponding charge state can be obtained through the method under the condition that the battery is not fully charged, so that the method is more flexible. Moreover, the state of charge can be corrected even under the condition of not fully charging, so that the correction flexibility is improved, and the correction efficiency is improved.
Furthermore, the method is used for carrying out charging tests based on different currents, and when charging piles with different powers are used for charging, the method can still meet the requirement of state of charge correction under the charging working condition. And the correction voltage node can be set according to the test cost and the precision requirement, so that the method is more flexible and convenient.
Therefore, the accurate charge state of the battery can be acquired under different environments, so that the safety and the reliability of the battery are improved, and the service life of the battery is prolonged.
In accordance with the above method embodiment, the present application also provides a device for acquiring a state of charge of a battery, and referring to fig. 5, the device 500 includes: an open circuit voltage acquisition module 502 and a state of charge acquisition module 504.
An open circuit voltage obtaining module 502 for obtaining the open circuit voltage of the battery;
the state of charge obtaining module 504 is configured to obtain a state of charge of the battery by using a corresponding relationship curve between a state of charge corrected by the battery and an open-circuit voltage, where the corresponding relationship between the state of charge corrected by the battery and the open-circuit voltage is obtained by:
acquiring the end-of-platform-period charge state of the battery in a corresponding relation curve of the charge state and the open-circuit voltage of the battery, and taking the terminal voltage corresponding to the end-of-platform-period charge state as the starting point of a voltage correction interval;
the method comprises the steps of taking a charge cut-off voltage value of voltage as an end point of a correction voltage interval, determining a plurality of correction voltage nodes in the correction voltage interval, obtaining the charge states corresponding to different temperatures and different currents under different correction voltage nodes through battery test, correcting a corresponding relation curve of the charge state and the open-circuit voltage of a battery, and obtaining the corresponding relation curve of the charge state and the open-circuit voltage after correction.
In some possible implementation manners, acquiring a state of charge at the end of a plateau period of the battery in a corresponding relation curve between the state of charge of the battery and an open-circuit voltage, and using a terminal voltage corresponding to the state of charge at the end of the plateau period as a starting point of the correction voltage interval includes:
acquiring the charge state of the battery at the end of the platform period in the corresponding relation curve of the charge state and the open-circuit voltage of the battery;
through battery test, acquiring terminal voltages corresponding to the end-of-platform-period charge states at different temperatures and different currents;
and when the charging temperature and the current of the battery are determined, the open-circuit voltage corresponding to the state of charge at the end of the plateau period is used as the starting point of the correction voltage interval.
In some possible implementations, the charge cutoff voltage value of the voltage is obtained by a manual of the battery.
In some possible implementations, determining a plurality of modified voltage nodes in a modified voltage interval includes:
in the correction voltage interval, N correction voltage nodes are arranged, wherein N is larger than 1;
determining the voltage difference between two adjacent correction voltage nodes according to the N correction voltage nodes;
n voltage nodes are determined from the voltage difference.
In some possible implementations, obtaining the corrected state of charge versus open circuit voltage includes:
and connecting the end point of the corrected voltage interval with the (N + 1) th voltage node to obtain a corresponding relation curve of the corrected charge state and the open-circuit voltage, wherein the voltage at two ends of the (N + 1) th voltage node is equal to the voltage value of the interval end point, and the (N + 1) th voltage node corresponds to the charge state to be 1.
In some possible implementations, the battery includes a lithium iron phosphate battery.
The application provides equipment for realizing a battery state of charge acquisition method. The apparatus includes a processor and a memory. The processor and the memory communicate with each other. The processor is configured to execute instructions stored in the memory to cause the apparatus to perform a method of battery state of charge acquisition.
The present application provides a computer-readable storage medium having stored therein instructions, which, when run on a device, cause the device to execute the above-mentioned battery state of charge acquisition method.
The present application provides a computer program product comprising instructions which, when run on a device, cause the device to perform the above-described method of battery state of charge acquisition.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiments of the apparatus provided in the present application, the connection relationship between the modules indicates that there is a communication connection therebetween, and may be implemented as one or more communication buses or signal lines.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general-purpose hardware, and certainly can also be implemented by special-purpose hardware including special-purpose integrated circuits, special-purpose CPUs, special-purpose memories, special-purpose components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, for the present application, the implementation of a software program is more preferable. Based on such understanding, the technical solutions of the present application may be substantially embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, an exercise device, or a network device) to execute the method according to the embodiments of the present application.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, training device, or data center to another website site, computer, training device, or data center via wired (e.g., coaxial cable, fiber optics, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a training device, a data center, etc., that incorporates one or more available media. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.
Claims (10)
1. A method for obtaining a state of charge of a battery, the method comprising:
acquiring the open-circuit voltage of the battery;
acquiring the state of charge of the battery by using the corresponding relation curve of the state of charge corrected by the battery and the open-circuit voltage, wherein the corresponding relation curve of the state of charge corrected by the battery and the open-circuit voltage is acquired by the following method:
acquiring the end-of-platform-period charge state of the battery in a corresponding relation curve of the charge state and the open-circuit voltage of the battery, and taking the terminal voltage corresponding to the end-of-platform-period charge state as the starting point of a voltage correction interval;
and taking the charge cut-off voltage value of the voltage as the end point of the correction voltage interval, determining a plurality of correction voltage nodes in the correction voltage interval, acquiring the charge states corresponding to different temperatures and different currents under the correction voltage nodes through battery test, correcting the corresponding relation curve of the charge state and the open-circuit voltage of the battery, and obtaining the corresponding relation curve of the charge state and the open-circuit voltage after correction.
2. The method according to claim 1, wherein the obtaining a state of charge at the end of a plateau period of the battery in a corresponding relationship curve of the state of charge and the open-circuit voltage of the battery, and the using a terminal voltage corresponding to the state of charge at the end of the plateau period as a starting point of the correction voltage interval comprises:
acquiring the charge state of the battery at the end of the platform period in the corresponding relation curve of the charge state and the open-circuit voltage of the battery;
through battery testing, acquiring terminal voltages corresponding to the end-of-platform charge states at different temperatures and different currents;
and when the charging temperature and the current of the battery are determined, the terminal voltage corresponding to the charge state of which the plateau period is ended is used as the starting point of the correction voltage interval.
3. The method of claim 1, wherein the charge cut-off voltage value of the voltage is obtained by a manual of the battery.
4. The method of claim 1, wherein said determining a plurality of modified voltage nodes in said modified voltage interval comprises:
in the correction voltage interval, N correction voltage nodes are arranged, wherein N is larger than 1;
determining the voltage difference between two adjacent correction voltage nodes according to the N correction voltage nodes;
and determining N voltage nodes according to the voltage difference.
5. The method of claim 4, wherein obtaining the corrected state of charge versus open circuit voltage curve comprises:
and connecting the end point of the corrected voltage interval with the (N + 1) th voltage node to obtain a corresponding relation curve of the corrected charge state and the open-circuit voltage, wherein the voltage at two ends of the (N + 1) th voltage node is equal to the voltage value of the end point of the interval, and the (N + 1) th voltage node corresponds to the charge state being 1.
6. The method of any one of claims 1 to 5, wherein the battery comprises a lithium iron phosphate battery.
7. An apparatus for acquiring a state of charge of a battery, the apparatus comprising:
the open-circuit voltage acquisition module is used for acquiring the open-circuit voltage of the battery;
the state of charge acquisition module is used for acquiring the state of charge of the battery by using the corresponding relation curve of the state of charge and the open-circuit voltage corrected by the battery, and the corresponding relation of the state of charge and the open-circuit voltage corrected by the battery is acquired by the following method:
acquiring the state of charge of the battery at the end of the plateau period in a corresponding relation curve of the state of charge of the battery and the open-circuit voltage, and taking a terminal voltage corresponding to the state of charge at the end of the plateau period as a starting point of a voltage correction interval;
and taking the charge cut-off voltage value of the voltage as the end point of the correction voltage interval, determining a plurality of correction voltage nodes in the correction voltage interval, acquiring the charge states corresponding to different temperatures and different currents under the correction voltage nodes through battery test, correcting the corresponding relation curve of the charge state and the open-circuit voltage of the battery, and obtaining the corresponding relation curve of the charge state and the open-circuit voltage after correction.
8. An apparatus, comprising a processor and a memory;
the processor is to execute instructions stored in the memory to cause the device to perform the method of any of claims 1 to 6.
9. A computer-readable storage medium comprising instructions that direct a device to perform the method of any of claims 1-6.
10. A computer program product, characterized in that it causes a computer to carry out the method according to any one of claims 1 to 6, when said computer program product is run on a computer.
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