CN115113049A - Method for determining initial value of battery SOC and related device - Google Patents
Method for determining initial value of battery SOC and related device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention provides a method for determining an initial value of a battery SOC and a related device, wherein the method is applied to a battery, the battery comprises n battery monomers, and for each battery monomer, the SOC value of the battery monomer is read in a preset storage space; judging whether storage abnormity occurs according to the SOC value of each battery monomer; if no storage abnormity occurs, regarding each single battery, taking the SOC value of the single battery read in the storage space as the initial SOC value of the single battery during the current charging and discharging; if the storage abnormity occurs, correcting the SOC value of each single battery cell with the storage error according to the SOC value of the single battery cell without the storage error to obtain the SOC correction value of the single battery cell, and taking the SOC correction value of the single battery cell as the initial SOC value of the single battery cell in the current charging and discharging process. The invention can improve the accuracy of the initial value of the SOC of the battery.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a method and a related device for determining an initial value of a battery SOC.
Background
With the global warming and various extreme climates, the problem of greenhouse gas emission caused by diesel and gasoline vehicles is more and more emphasized, and the development of electric vehicles and hybrid electric vehicles is receiving wide attention in order to reduce urban pollution.
In order to ensure the operational safety, durability, reliability, and efficiency of electric vehicles, and to perform necessary management and diagnostic functions, Battery Management Systems (BMSs) are widely used in electric vehicles. The state of charge (SOC) represents a percentage value of the remaining capacity of the battery pack, and is one of important states that the BMS needs to monitor in order to measure the current available capacity of the battery pack. Accurate SOC estimation can guarantee relevant strategies of the whole vehicle, the safety of the battery and the experience of drivers and passengers.
In the SOC estimation method, an ampere-hour integration method is one of important algorithms. The SOC is estimated by an ampere-hour integration method, and the acquisition of an initial value of the SOC is a very important step, and how to improve the accuracy of the initial value of the SOC is a technical problem which needs to be solved urgently in the prior art.
Disclosure of Invention
In view of this, the present invention provides a method and a related apparatus for determining an initial value of a battery SOC, which can solve the problem that the initial value of the battery SOC is inaccurate when the battery SOC is estimated by an ampere-hour integration method.
In a first aspect, an embodiment of the present invention provides a method for determining an initial value of a battery SOC, where the method is applied to a battery, where the battery includes n battery cells, where n is a positive integer greater than or equal to 2, and includes:
for each single battery, reading the SOC value of the single battery in a preset storage space, wherein the SOC value of each single battery when the charging and discharging of the battery are finished last time is stored in the storage space;
judging whether storage abnormity occurs according to the SOC value of each battery monomer, wherein the storage abnormity is used for indicating that storage errors occur in the SOC value of at least one battery monomer in the storage space;
if no storage abnormity occurs, regarding each single battery, taking the SOC value of the single battery read in the storage space as the initial SOC value of the single battery during the current charging and discharging;
if the storage abnormity occurs, correcting the SOC value of each single battery cell with the storage error according to the SOC value of the single battery cell without the storage error to obtain the SOC correction value of the single battery cell, and taking the SOC correction value of the single battery cell as the initial SOC value of the single battery cell in the current charging and discharging process.
In one possible implementation manner, the determining whether a storage abnormality occurs according to the SOC value of each battery cell includes:
if the SOC values of m battery monomers are 0, acquiring a maximum value from the SOC values of the n battery monomers, wherein m is a positive integer which is greater than or equal to 1 and smaller than n;
if the maximum value is larger than a preset SOC value, judging that the SOC values of the m battery monomers are abnormally stored;
and if the maximum value is less than or equal to the preset SOC value, judging that no storage abnormity occurs.
In one possible implementation manner, if a storage abnormality occurs, the correcting the SOC value of each battery cell having a storage error according to the SOC value of the battery cell having no storage error to obtain an SOC correction value of the battery cell, and using the SOC correction value of the battery cell as the initial SOC value of the battery cell during the current charging and discharging includes:
acquiring a minimum value from all SOC values of the n battery monomers, which are not 0;
and regarding each battery cell with the SOC value of 0, taking the minimum value as the SOC correction value of the battery cell.
In a possible implementation manner, the determining whether a storage anomaly occurs according to the SOC value of each battery cell includes determining that a storage anomaly occurs if the SOC value of each battery cell read in the storage space is 0, and the method further includes:
and obtaining the minimum open-circuit voltage from the open-circuit voltages of the n battery monomers, searching the OCV table according to the minimum open-circuit voltage to determine an SOC, and taking the SOC value as the initial SOC value of each battery monomer for charging and discharging at this time.
In one possible implementation, the method further includes:
and storing the SOC value of each single battery to the storage space when the current charge and discharge of the battery is finished.
In a second aspect, an embodiment of the present invention provides an apparatus for determining an initial value of a battery SOC, where the apparatus is applied to a battery, the battery includes n battery cells, n is a positive integer greater than or equal to 2, and the apparatus includes: the device comprises a reading module, a judging module and an initial value determining module;
the reading module is used for reading the SOC value of each single battery in a preset storage space aiming at each single battery, and the storage space stores the SOC value of each single battery when the last charging and discharging of the battery is finished;
the judging module is used for judging whether storage abnormity occurs according to the SOC value of each battery monomer, and the storage abnormity is used for indicating that storage errors occur in the SOC value of at least one battery monomer in the storage space;
the initial value determining module is used for taking the SOC value of the battery monomer read from the storage space as the SOC initial value of the battery monomer during the current charging and discharging for each battery monomer if no storage abnormity occurs;
the initial value determining module is further configured to, if a storage abnormality occurs, correct the SOC value of each single battery cell with a storage error according to the SOC value of the single battery cell without the storage error to obtain an SOC correction value of the single battery cell, and use the SOC correction value of the single battery cell as the initial SOC value of the single battery cell for the current charge and discharge.
In a possible implementation manner, the determining module is configured to:
if the SOC values of m battery monomers are 0, acquiring a maximum value from the SOC values of the n battery monomers, wherein m is a positive integer which is greater than or equal to 1 and smaller than n;
if the maximum value is larger than a preset SOC value, judging that the SOC values of the m battery monomers are abnormally stored;
and if the maximum value is less than or equal to the preset SOC value, judging that no storage abnormity occurs.
In one possible implementation manner, the initial value determining module is configured to:
acquiring a minimum value from all SOC values of the n battery monomers, which are not 0;
and regarding each battery cell with the SOC value of 0, taking the minimum value as the SOC correction value of the battery cell.
In a third aspect, the present invention provides a vehicle, including a control device, where the control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect when executing the computer program.
In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the embodiment of the invention judges whether the SOC value of each battery cell stored in the storage space has the SOC value with storage error, if so, the error SOC value is corrected by the SOC values of other battery cells without storage error, and the corrected SOC is taken as the initial SOC value of the battery cell, so that the accuracy of the initial value of the SOC of the battery in the ampere-hour integration method is improved, and the estimation accuracy of the SOC value of the battery is further improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of an implementation of a method for determining an initial value of a battery SOC according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for determining an initial value of a battery SOC according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
To make the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
The lithium ion battery is used as a highly complex nonlinear system, SOC cannot be directly measured, and the SOC can only be estimated through parameters such as battery terminal voltage, charge-discharge current and internal resistance. An ampere-hour integration method, also called as a current integration method, is one of the most widely used methods for estimating the SOC of a lithium ion battery at present. The main idea is to measure the discharge current of the battery and integrate the current with time to calculate the amount of electricity discharged over a period of time, and then estimate the SOC of the battery. The formula of the ampere-hour integration method is as follows:
in the formula, SOC 0 Is an initial value of SOC of the battery, C N Is the rated capacity of the battery, and is the charge and discharge current of the battery, wherein Icharge is negative and discharge is positive.
From this, it can be seen that the ampere-hour integration method depends on the SOC 0 Only to ensure accurate SOC 0 An accurate SOC value can be obtained. If SOC 0 If there is a deviation, the SOC value error will accumulate, and the error will become large, resulting in low estimation accuracy.
The initial value of the existing SOC, i.e. SOC 0 There are two methods of acquisition, one is an open circuit voltage method and the other is an NVM read method.
The Open Circuit Voltage (OCV) refers to a static open circuit voltage of a single battery, the single battery may generate a polarization phenomenon after being charged or discharged, at this time, an external characteristic voltage of the single battery is inconsistent with an open circuit standing voltage of the single battery, so that the polarization of the single battery needs to be removed by standing for a certain time, and a voltage after standing is the OCV. On the one hand, the OCV method is highly dependent on the standing time because the standing is required to uniformly distribute the electrolyte inside the battery to obtain a stable terminal voltage due to hysteresis caused by the ohmic resistance, polarization resistance, electrochemical polarization, and concentration plan inside the battery. On the other hand, since the OCV of the battery is close in value to the battery electromotive force and there is a certain mapping relationship with the internal lithium ion concentration, the OCV-SOC lookup table is established through a large number of intensive experiments, and the SOC of the battery is determined from the mapping relationship of the OCV and the SOC by measuring the OCV of the battery when the battery is in an operating state. However, since the OCV-SOC lookup table is experimentally established and is only suitable for battery SOC estimation under the same experimental conditions, when the target battery is at different temperatures and different life cycles, the estimation of SOC by using the previously established lookup table will cause a large error.
The NVM (Non-Volatile Memory) reading method is to store the SOC value of the battery at the last time of charging and discharging in a storage space as the initial SOC value of the current charging and discharging, but the NVM storage depends on flash storage, and during the storage process, due to factors such as chip reasons, flash problem, large data volume, or the refreshing software flushes out the stored value, the storage may fail. If the storage fails, the SOC value obtained by forcibly using the OCV lookup table may be used as the initial SOC value of the ampere-hour integration method, which may cause a larger error.
In combination with the above problem, an embodiment of the present invention provides a method for determining an initial value of SOC of a battery pack, and referring to fig. 1, the method includes:
in step 101, for each battery cell, the SOC value of the battery cell is read in a preset storage space, and the SOC value of each battery cell when the last charge and discharge of the battery is completed is stored in the storage space.
In the embodiment of the present invention, the storage space of the preset setting may be an NVM memory. And storing the SOC at the end into the storage space as the initial SOC value of the next charging and discharging of the battery every time the charging and discharging of the battery are ended.
The embodiment of the invention is applied to a battery, which comprises n battery monomers, wherein after the charging and discharging of the battery are finished, the SOC value of each battery monomer at the end is stored in the storage space and is used as the initial value of the SOC of each battery monomer when the charging and discharging of the battery are started next time.
When the battery starts to charge and discharge at this time, a group of data SOC is obtained by reading data in the storage space S1 、SOC S2 、SOC S3 ……，SOC Sx ，……，SOC Sn . Therein, SOC Sx Is the SOC value of the xth cell read in the memory space.
In step 102, it is determined whether a storage error occurs in accordance with the SOC value of each battery cell, and the storage error is used to indicate that a storage error occurs in the SOC value of at least one battery cell in the storage space.
In a possible implementation manner, if there are m battery cells having SOC values of 0, obtaining a maximum value among the SOC values of the n battery cells, where m is a positive integer greater than or equal to 1 and less than n; if the maximum value is larger than a preset SOC value, judging that the SOC values of the m battery monomers are abnormally stored; and if the maximum value is less than or equal to the preset SOC value, judging that no storage abnormity occurs.
For ease of understanding, the following is described as an example:
a battery comprises 5 single batteries, namely a single battery 1, a single battery 2, a single battery 3, a single battery 4 and a single battery 5.
When the battery starts to charge and discharge at this time, reading the SOC values of the battery monomers 1 to 5 from the storage space to be the SOC values S1 ＝0，SOC S2 ＝a，SOC S3 ＝b，SOC S4 ＝0，SOC S5 C. Wherein a, b and c are constants larger than zero.
The maximum value of the SOC values of the 5 battery cells is obtained, assuming that c is the maximum value, determining whether c is greater than a preset SOC value, for example, setting the preset SOC value to 10%, because the difference between the initial SOC values of the plurality of battery cells of the same battery is not too large, if c is greater than 10%, determining that a storage error occurs between the SOC value of the battery cell 1 and the SOC value of the battery cell 4, for example, the SOC value of the battery cell 1 after the last charge and discharge of the battery is a constant d greater than zero, but due to a storage reason, d is set to 0, that is, a storage error occurs to the SOC value of the battery cell 1. If c is less than or equal to 10%, it is determined that no storage error, that is, no storage abnormality has occurred in the SOC values of the battery cell 1 and the battery cell 4.
In another possible implementation manner, if the SOC value of each battery cell read in the storage space is 0, it is determined that a storage abnormality occurs, and a minimum open circuit voltage is obtained from the open circuit voltages of n battery cells; and according to the minimum open-circuit voltage, searching the OCV table to determine an SOC, and taking the SOC value as an initial SOC value of each single battery in the current charging and discharging.
For example, for the storage space, the current charge and discharge of the battery is the first charge and discharge of the battery, that is, there is no SOC value of the battery at the end of the last charge and discharge in the storage space, and the SOC value of each battery cell stored in the storage space is a preset initial value 0, or a storage error occurs in the SOC value of each battery cell in the storage space, which causes the original data to be covered by 0, so that the SOC value of each battery cell read in the storage space is 0, and in this case, the minimum open-circuit voltage is obtained from the open-circuit voltages of n battery cells; and according to the minimum open-circuit voltage, searching the OCV table to determine an SOC, and assuming the SOC is 1, the initial value of the SOC of each battery cell in the current charging and discharging of the battery is SOC 1.
Further, the SOC value of each single battery at the end of the current charge and discharge of the battery is stored in the storage space. As the initial value of SOC for the next charge and discharge of the battery.
In step 103, if no storage abnormality occurs, the SOC value of the battery cell read out from the storage space is set as the initial SOC value of the battery cell in the present charge and discharge for each battery cell.
In the embodiment of the present invention, if c is equal to or less than 10%, it is determined that no storage error, that is, no storage abnormality has occurred in the SOC values of the battery cell 1 and the battery cell 4. At this time, SOC S1 ＝0，SOC S2 ＝a，SOC S3 ＝b，SOC S4 ＝0，SOC S5 The initial value of the SOC of each single battery at the current charge and discharge of the battery, that is, the initial value of the SOC of the single battery 1 is 0, the initial value of the SOC of the single battery 2 is a, the initial value of the SOC of the single battery 3 is b, the initial value of the SOC of the single battery 4 is 0, and the initial value of the SOC of the single battery 5 is c.
In step 104, if a storage error occurs, the SOC value of each cell having a storage error is corrected according to the SOC value of a cell having no storage error to obtain an SOC correction value of the cell, and the SOC correction value of the cell is used as the initial SOC value of the current charge and discharge of the cell.
In the embodiment of the invention, the minimum value is obtained from all SOC values of n battery monomers which are not 0; for each cell having an SOC value of 0, the minimum value is used as the SOC correction value for that cell.
In the embodiment of the invention, the minimum value is selected as the SOC correction value of the battery cell with the SOC value of 0, so that the condition that the battery is not fully charged or the battery is over-discharged is avoided.
In the example of step 102, if c is greater than 10%, it is determined that a storage error has occurred in the SOC value of the battery cell 1 and the SOC value of the battery cell 4, and at this time, the minimum value among a, b, and c is obtained, and if the minimum value is a, a is used as the SOC correction value for the battery cell 1 and the battery cell 4.
Corrected SOC S1 ＝a，SOC s2 ＝a，SOC S3 ＝b，SOC S4 ＝a，SOC S5 ＝c
That is, at the start of the charge and discharge of the battery at this time, the initial SOC value of the cell 1 is a, the initial SOC value of the cell 2 is a, the initial SOC value of the cell 3 is b, the initial SOC value of the cell 4 is a, and the initial SOC value of the cell 5 is c.
The embodiment of the invention judges whether the SOC value of each battery cell stored in the storage space has the SOC value with storage error, if so, the error SOC value is corrected by the SOC values of other battery cells without storage error, and the corrected SOC is taken as the initial SOC value of the battery cell, so that the accuracy of the initial value of the SOC of the battery in the ampere-hour integration method is improved, and the estimation accuracy of the SOC value of the battery is further improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not limit the implementation process of the embodiments of the present invention in any way.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 2 is a schematic structural diagram of an apparatus for determining an initial value of SOC of a battery according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 2, the apparatus 2 for determining the initial value of the SOC of the battery includes: a reading module 21, a judging module 22 and an initial value determining module 23;
the reading module 21 is configured to read, for each single battery, an SOC value of the single battery in a preset storage space, where the SOC value of each single battery when the last charging and discharging of the battery is completed is stored;
a determining module 22, configured to determine whether a storage anomaly occurs according to the SOC value of each battery cell, where the storage anomaly is used to indicate that a storage error occurs in the SOC value of at least one battery cell in the storage space;
an initial value determining module 23, configured to, if no storage abnormality occurs, regarding each single battery, use the SOC value of the single battery read in the storage space as an SOC initial value of the single battery for the current charging and discharging;
the initial value determining module 23 is further configured to, if a storage abnormality occurs, correct the SOC value of each single battery cell with a storage error according to the SOC value of the single battery cell without the storage error to obtain an SOC correction value of the single battery cell, and use the SOC correction value of the single battery cell as the initial SOC value of the single battery cell during the current charging and discharging.
The embodiment of the invention judges whether the SOC value of each battery cell stored in the storage space has the SOC value with the storage error, if so, the SOC value with the storage error is corrected by the SOC values of other battery cells without the storage error, and the corrected SOC is used as the initial SOC value of the battery cell, so that the accuracy of the initial value of the SOC of the battery in the ampere-hour integration method is improved, and the estimation accuracy of the SOC value of the battery is further improved.
In one possible implementation, the determining module 22 is configured to:
if the SOC values of m battery monomers are 0, acquiring a maximum value from the SOC values of n battery monomers, wherein m is a positive integer which is greater than or equal to 1 and smaller than n;
if the maximum value is larger than the preset SOC value, judging that the SOC values of the m battery monomers are abnormally stored;
and if the maximum value is less than or equal to the preset SOC value, judging that no storage abnormity occurs.
In one possible implementation, the initial value determining module 23 is configured to:
acquiring a minimum value from all SOC values of the n battery monomers, which are not 0;
for each cell having an SOC value of 0, the minimum value is used as the SOC correction value for that cell.
In one possible implementation, the initial value determining module 23 is further configured to:
if the SOC value of each battery cell read in the storage space is 0, acquiring the minimum open-circuit voltage from the open-circuit voltages of the n battery cells;
and according to the minimum open-circuit voltage, searching the OCV table to determine an SOC, and taking the SOC value as an initial SOC value of each single battery in the charge and discharge process.
In one possible implementation, the apparatus is further configured to:
and storing the SOC value of each single battery at the end of the current charge and discharge of the battery into a storage space.
The apparatus for determining an initial value of a battery SOC provided in this embodiment may be used to implement the method embodiment for determining an initial value of a battery SOC, which has similar implementation principles and technical effects, and this embodiment is not described herein again.
Fig. 3 is a schematic diagram of a control device according to an embodiment of the present invention. As shown in fig. 3, the control device 3 of this embodiment includes: a processor 30, a memory 31 and a computer program 32 stored in said memory 31 and executable on said processor 30. The processor 30, when executing the computer program 32, implements the steps in the various method embodiments described above for determining an initial value of battery SOC, such as steps 101-104 shown in fig. 1. Alternatively, the processor 30, when executing the computer program 32, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the units 21 to 23 shown in fig. 2.
Illustratively, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 32 in the control device 3.
The control device 3 may be a control device, a module, a chip, etc. corresponding to the battery management system, or may be a control device, a module, a chip, etc. used alone to implement each method embodiment of the present invention. The control device 3 may include, but is not limited to, a processor 30 and a memory 31. It will be understood by those skilled in the art that fig. 3 is only an example of the control apparatus 3, and does not constitute a limitation to the control apparatus 3, and may include more or less components than those shown, or combine some components, or different components, for example, the control apparatus may further include an input-output device, a network access device, a bus, etc.
The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 31 may be an internal storage unit of the control device 3, such as a hard disk or a memory of the control device 3. The memory 31 may also be an external storage device of the control apparatus 3, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the control apparatus 3. Further, the memory 31 may also include both an internal storage unit of the control apparatus 3 and an external storage device. The memory 31 is used for storing the computer program and other programs and data required by the control device. The memory 31 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/control apparatus and method may be implemented in other ways. For example, the above-described apparatus/control apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method of the embodiments described above may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the method for determining the initial value of the SOC of the battery may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A method for determining an initial value of SOC of a battery, the method being applied to a battery including n battery cells, n being a positive integer greater than or equal to 2, and comprising:
for each single battery, reading the SOC value of the single battery in a preset storage space, wherein the SOC value of each single battery when the last charging and discharging of the battery is finished is stored in the storage space;
judging whether storage abnormity occurs according to the SOC value of each battery monomer, wherein the storage abnormity is used for indicating that storage errors occur in the SOC value of at least one battery monomer in the storage space;
if no storage abnormity occurs, regarding each single battery, taking the SOC value of the single battery read in the storage space as the initial SOC value of the single battery during the current charging and discharging;
if the storage abnormality occurs, correcting the SOC value of each battery cell with the storage error according to the SOC value of the battery cell without the storage error to obtain the SOC correction value of the battery cell, and taking the SOC correction value of the battery cell as the initial SOC value of the battery cell in the current charging and discharging process.
2. The method according to claim 1, wherein the determining whether a storage abnormality occurs according to the SOC value of each battery cell includes:
if the SOC values of m battery monomers are 0, acquiring a maximum value from the SOC values of n battery monomers, wherein m is a positive integer which is greater than or equal to 1 and less than n;
if the maximum value is larger than a preset SOC value, judging that the SOC values of the m battery monomers are abnormally stored;
and if the maximum value is less than or equal to the preset SOC value, judging that no storage abnormity occurs.
3. The method according to claim 1 or 2, wherein, if a storage abnormality occurs, the step of correcting the SOC value of each cell having a storage error according to the SOC value of a cell having no storage error to obtain an SOC correction value of the cell, and the step of using the SOC correction value of the cell as the initial SOC value of the cell for the current charging and discharging comprises:
acquiring a minimum value from all SOC values of the n battery monomers, which are not 0;
and regarding each battery cell with the SOC value of 0, taking the minimum value as the SOC correction value of the battery cell.
4. The method according to claim 1 or 2, wherein the determining whether the storage abnormality occurs according to the SOC value of each battery cell includes determining that the storage abnormality occurs if the SOC value of each battery cell read in the storage space is 0, the method further comprising:
and obtaining the minimum open-circuit voltage from the open-circuit voltages of the n battery monomers, searching the OCV table according to the minimum open-circuit voltage to determine an SOC, and taking the SOC value as the initial SOC value of each battery monomer for charging and discharging at this time.
5. The method of claim 4, further comprising:
and storing the SOC value of each single battery at the end of the current charge and discharge of the battery into the storage space.
6. An apparatus for determining an initial value of a battery SOC, the apparatus being applied to a battery including n battery cells, n being a positive integer greater than or equal to 2, the apparatus comprising: the device comprises a reading module, a judging module and an initial value determining module;
the reading module is used for reading the SOC value of each single battery in a preset storage space aiming at each single battery, and the SOC value of each single battery when the charging and discharging of the battery are finished last time is stored in the storage space;
the judging module is used for judging whether storage abnormity occurs according to the SOC value of each battery monomer, and the storage abnormity is used for indicating that storage errors occur in the SOC value of at least one battery monomer in the storage space;
the initial value determining module is used for taking the SOC value of the battery monomer read from the storage space as the SOC initial value of the battery monomer during the current charging and discharging for each battery monomer if no storage abnormity occurs;
the initial value determining module is further configured to, if a storage abnormality occurs, correct the SOC value of each single battery cell with a storage error according to the SOC value of the single battery cell without the storage error to obtain an SOC correction value of the single battery cell, and use the SOC correction value of the single battery cell as the initial SOC value of the single battery cell for the current charge and discharge.
7. The apparatus of claim 6, wherein the determining module is configured to:
if the SOC values of m battery monomers are 0, acquiring a maximum value from the SOC values of the n battery monomers, wherein m is a positive integer which is greater than or equal to 1 and smaller than n;
if the maximum value is larger than a preset SOC value, judging that the SOC values of the m battery monomers are abnormally stored;
and if the maximum value is less than or equal to the preset SOC value, judging that no storage abnormity occurs.
8. The apparatus of claim 6 or 7, wherein the initial value determination module is configured to:
acquiring a minimum value from all SOC values of the n battery monomers, which are not 0;
and regarding each battery cell with the SOC value of 0, taking the minimum value as the SOC correction value of the battery cell.
9. A vehicle comprising a control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the steps of the method as claimed in any one of the preceding claims 1 to 5 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5 above.
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| CN202111604020.6A CN115113049A (en) | 2021-12-24 | 2021-12-24 | Method for determining initial value of battery SOC and related device |
| PCT/CN2022/139024 WO2023116531A1 (en) | 2021-12-24 | 2022-12-14 | Method and related device for determining initial soc value of battery |
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| CN202111604020.6A CN115113049A (en) | 2021-12-24 | 2021-12-24 | Method for determining initial value of battery SOC and related device |
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| WO2023116531A1 (en) * | 2021-12-24 | 2023-06-29 | 长城汽车股份有限公司 | Method and related device for determining initial soc value of battery |
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| CN116908704B (en) * | 2023-09-07 | 2024-04-09 | 江西五十铃汽车有限公司 | Method, device and medium for SOH estimation and correction of power battery |
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| CN101966820B (en) * | 2010-08-26 | 2013-06-12 | 清华大学 | On-line monitoring method for self-adaptively correcting lithium ion battery state-of-charge |
| JP5699870B2 (en) * | 2011-09-07 | 2015-04-15 | 株式会社Ｇｓユアサ | Battery management device, battery pack, battery management program, and SOC estimation method |
| CN103323775B (en) * | 2012-03-20 | 2015-07-08 | 北汽福田汽车股份有限公司 | Balanced monitoring and test system used for battery module |
| CN103390920B (en) * | 2013-07-23 | 2015-06-24 | 大连融科储能技术发展有限公司 | All vanadium redox flow battery management method and system applied to scale energy storage |
| CN106872908A (en) * | 2017-04-26 | 2017-06-20 | 安徽优旦科技有限公司 | BMS system exception power down SOC guard methods |
| JP2019184316A (en) * | 2018-04-04 | 2019-10-24 | 株式会社デンソーテン | Device and method for estimation |
| CN108928245A (en) * | 2018-05-17 | 2018-12-04 | 四川野马汽车股份有限公司 | A kind of dynamic calibration method of electric automobile power battery SOC |
| CN111781507B (en) * | 2020-06-04 | 2022-05-10 | 珠海格力电器股份有限公司 | SOC value display method and device and energy storage system |
| CN115113049A (en) * | 2021-12-24 | 2022-09-27 | 长城汽车股份有限公司 | Method for determining initial value of battery SOC and related device |
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| WO2023116531A1 (en) * | 2021-12-24 | 2023-06-29 | 长城汽车股份有限公司 | Method and related device for determining initial soc value of battery |
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