CN114879057A - Battery monomer SOC low fault diagnosis method and system and readable storage medium - Google Patents
Battery monomer SOC low fault diagnosis method and system and readable storage medium Download PDFInfo
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- CN114879057A CN114879057A CN202210423410.1A CN202210423410A CN114879057A CN 114879057 A CN114879057 A CN 114879057A CN 202210423410 A CN202210423410 A CN 202210423410A CN 114879057 A CN114879057 A CN 114879057A
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The method comprises the steps of determining total voltage data corresponding to each battery cluster in a lithium battery energy storage system, wherein each battery cluster comprises a plurality of battery monomers; calculating the average voltage value corresponding to each battery cluster according to the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery monomers; for each battery monomer in the same battery cluster, determining a fault judgment condition according to the average voltage value, a preset monomer voltage calibration value, a preset voltage difference value and a monomer voltage value of the battery monomer in a preset working stage; and when determining that the corresponding target battery monomer meets the fault judgment condition, outputting a fault diagnosis result representing that the SOC of the battery monomer is low and a fault exists. By adopting the method, the false alarm rate of the low SOC fault diagnosis can be reduced.
Description
Technical Field
The application relates to the technical field of SOC management, in particular to a method and a system for diagnosing low SOC faults of a single battery and a readable storage medium.
Background
The direct current side of the lithium battery energy storage system is composed of a plurality of groups of battery monomers which are connected in series, and in the discharging process of the lithium battery energy storage system, if the SOC (State of Charge) of a certain battery monomer in a certain battery cluster is reduced to 0, not only the battery cluster can stop discharging, but also all battery clusters under the same lithium battery energy storage system can stop discharging, otherwise, the monomer overdischarging is possibly caused, and finally serious safety accidents are caused. The lowest individual SOC directly determines the overall efficiency of the lithium battery energy storage system.
The low SOC of the single battery is a long-term accumulated result, and the low SOC is a special condition in the discharging process and can be recovered after being fully charged. In the existing technical scheme, whether the situation that the SOC of the lithium battery is low and inconsistent is judged based on the SOC at a certain moment usually, which also causes the problems of high false alarm rate and low accuracy rate.
Disclosure of Invention
The purpose of the embodiment of the application is to provide a method, a system and a readable storage medium for diagnosing the low SOC fault of a single battery, which can reduce the false alarm rate of the low SOC fault diagnosis.
The embodiment of the application also provides a battery monomer SOC low fault diagnosis method, which comprises the following steps:
determining total voltage data corresponding to each battery cluster in a lithium battery energy storage system, wherein each battery cluster comprises a plurality of battery monomers;
calculating the average voltage value corresponding to each battery cluster according to the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery monomers;
for each battery monomer in the same battery cluster, determining a fault judgment condition according to the average voltage value, a preset monomer voltage calibration value, a preset voltage difference value and a monomer voltage value of the battery monomer in a preset working stage; the working stage comprises at least one of a discharging stage, a standing stage after discharging and a charging stage;
and when the corresponding target battery monomer is determined to meet the fault judgment condition, outputting a fault diagnosis result representing that the SOC of the battery monomer is low and a fault exists.
In a second aspect, an embodiment of the present application further provides a system for diagnosing a low SOC fault of a battery cell, where the system includes a data acquisition module, a first calculation module, a second calculation module, and a fault determination module, where:
the data acquisition module is used for determining total voltage data corresponding to each battery cluster in a lithium battery energy storage system, wherein each battery cluster comprises a plurality of battery monomers;
the first calculating module is used for calculating average voltage values corresponding to the battery clusters respectively according to total voltage data corresponding to the corresponding battery clusters and the total number of the included battery monomers;
the second calculation module is used for determining a fault judgment condition according to the average voltage value, a preset monomer voltage calibration value, a preset voltage difference value and a monomer voltage value of each battery monomer in a preset working stage aiming at each battery monomer in the same battery cluster; the working stage comprises at least one of a discharging stage, a standing stage after discharging and a charging stage;
and the fault judgment module is used for outputting a fault diagnosis result representing that the SOC of the battery monomer is low and a fault exists when the corresponding target battery monomer is determined to meet the fault judgment condition.
In a third aspect, an embodiment of the present application further provides a readable storage medium, where the readable storage medium includes a program of a cell SOC low fault diagnosis method, and when the program of the cell SOC low fault diagnosis method is executed by a processor, the steps of the method for diagnosing a cell SOC low fault as described in any one of the above are implemented.
Therefore, according to the method, the system and the readable storage medium for diagnosing the low SOC fault of the single battery provided by the embodiment of the application, by analyzing the voltage characteristics of the single battery in the whole charging and discharging stage, compared with the prior art in which only the SOC at a certain moment is analyzed, the lowest single battery SOC is diagnosed, so that the overall diagnosis accuracy of the single battery can be effectively improved, the overall operation efficiency of the lithium battery energy storage system is improved, and the false alarm rate of the low SOC fault diagnosis is reduced.
Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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 flowchart of a battery cell SOC low fault diagnosis method according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a system for diagnosing a low SOC fault of a battery cell according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within 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 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.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for diagnosing a low SOC fault of a battery cell according to some embodiments of the present disclosure. The method is applied to a computer device (the computer device may be specifically a terminal or a server, the terminal may be specifically but not limited to various personal computers, notebook computers, smart phones, tablet computers and portable wearable devices, the server may be an independent server or a server cluster composed of a plurality of servers) as an example for explanation, and the method includes the following steps
S101, determining total voltage data corresponding to each battery cluster in a lithium battery energy storage system, wherein each battery cluster comprises a plurality of single batteries.
Specifically, when the computer device determines that the computer device is successfully connected to the lithium battery energy storage system, the computer device obtains voltage data V of each battery cell in the lithium battery energy storage system, and determines total voltage data corresponding to each battery cluster based on the determined voltage data V.
In one embodiment, when it is determined that B battery cells are included in the corresponding battery cluster a, the total voltage data of the battery cluster a is B × V when the voltage data V of each battery cell is known. Of course, the current embodiment is not limited to the above calculation method, and the above formula may be adjusted according to actual calculation requirements, which is not limited in the embodiment of the present application.
And S102, calculating average voltage values corresponding to the battery clusters respectively according to the total voltage data corresponding to the corresponding battery clusters and the total number of the included battery monomers.
Specifically, calculating the average voltage value corresponding to each battery cluster according to the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery cells, includes: and performing division calculation on the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery monomers, and determining the average voltage value corresponding to each battery cluster according to the obtained division result.
In one embodiment, the computer device will calculate the average voltage value V corresponding to each cluster of batteries respectively in cluster units avg ＝V General assembly And/n. Wherein, V avg Represents the average voltage, V, of the battery cluster General assembly The total voltage of the battery cluster is represented, and n represents the total number of the battery cells in the battery cluster, namely the total number of the battery monomers.
S103, determining a fault judgment condition according to the average voltage value, a preset single voltage calibration value, a preset voltage difference value and a single voltage value of each battery cell in the same battery cluster in a preset working stage; the working phase comprises at least one of a discharging phase, a standing phase after discharging and a charging phase.
And S104, when the corresponding target battery monomer is determined to meet the fault judgment condition, outputting a fault diagnosis result representing that the SOC of the battery monomer is low and a fault exists.
Specifically, when the computer device is connected to the user terminal, when it is determined that the corresponding target battery cell meets the fault judgment condition, the fault diagnosis result is output to the user terminal, so that the user terminal can master the real-time operation condition of the lithium battery energy storage system in real time and perform fault troubleshooting in time.
In one embodiment, a display screen, a broadcasting device, a lighting device and the like are built in the computer device, and the computer device can also display the fault diagnosis result through the built-in display screen and/or perform voice prompt through the built-in broadcasting device. Of course, the computer device may also display the fault diagnosis result in other manners, for example, when it is determined that the fault diagnosis result is output, the built-in lighting device is triggered to perform lighting display to prompt the user that the operation fault exists currently.
Therefore, according to the method for diagnosing the low SOC fault of the single battery, the voltage characteristics of the single battery in the whole charging and discharging stage are analyzed, and compared with the method for diagnosing the lowest SOC of the single battery by analyzing the SOC at a certain moment in the prior art, the method for diagnosing the low SOC fault of the single battery can effectively improve the whole diagnosis accuracy of the single battery, improve the whole operation efficiency of a lithium battery energy storage system, and reduce the false alarm rate of the low SOC fault diagnosis.
In one embodiment, the fault decision condition includes: in the discharging stage, when the average voltage value is determined to be greater than or equal to the monomer voltage calibration value, and within the continuous preset times, a first fault judgment condition exists, wherein the voltage difference between the average voltage and the monomer voltage value is greater than or equal to a preset first multiple of the voltage difference.
Specifically, in the discharging stage, the computer device performs the following analysis on each battery cell in the same battery cluster: when determining V corresponding to the corresponding battery cell avg ≧ M, and present a plurality of times (e.g., 3 times) in succession: v avg -V e If the SOC of the battery monomer is lower than the first threshold, judging that the battery monomer meets a first fault judgment condition; wherein, V e For the cell voltage value in the current discharge analysis stage, M is a fixed calibration value of the cell voltage (i.e. a preset calibration value of the cell voltage), and N is a fixed voltage difference value.
In the discharging stage, when the average voltage is smaller than the monomer voltage calibration value, and in the continuous preset times, a second fault judgment condition exists, wherein the voltage difference between the average voltage and the monomer voltage value is larger than or equal to a preset second-multiple voltage difference value; wherein the second multiple is greater than the first multiple.
Specifically, during the discharging phase, the computer device also provides power to each of the batteries in the same battery clusterCell monomers were analyzed as follows: when determining V corresponding to the corresponding battery cell avg < M, and V is present successively a plurality of times avg -V e And if the number of the battery cells is more than or equal to 2N, the battery cells are considered to meet a second fault judgment condition. In the present embodiment, the value of the second multiplier is 2, and certainly, the setting of the second multiplier is not limited to this value, and this is not limited in the embodiment of the present application.
In the stage of standing after discharging, and within the determined continuous preset times, a third fault judgment condition exists, wherein the voltage difference between the average voltage and the single voltage value is greater than or equal to a preset third multiple of the voltage difference; wherein the second multiple is greater than the third multiple.
Specifically, in the stage of standing after discharging, the computer device further analyzes each battery cell in the same battery cluster as follows: when it is determined that V appears continuously for a plurality of times avg -V e And when the voltage is more than or equal to 0.75N, the corresponding battery monomer is considered to meet the third fault judgment condition. In the present embodiment, the value of the third multiple is 0.75, and of course, the setting of the third multiple is not limited to this value, and the embodiment of the present application does not limit this value
And a fourth failure determination condition in which the cell voltage value is smaller than the average voltage in the charging stage, and a voltage difference between the cell voltage value and the average voltage is larger near a final charging stage.
Specifically, in the charging phase, the computer device further analyzes each battery cell in the same battery cluster as follows: when the cell voltage V corresponding to the corresponding battery cell is determined e Below average voltage V avg And, the closer to the end of charging, the cell voltage V e And an average voltage V avg When the pressure difference between the battery cells is larger, the corresponding battery cell is considered to meet the fourth fault judgment condition.
In the embodiment, the voltage characteristics of each battery cell in the charging and discharging processes are fully analyzed, instead of the voltage characteristics at a certain moment, so that the accuracy of overall diagnosis is improved, and the false alarm rate of low-SOC fault diagnosis is reduced.
In one embodiment, in step S104, when it is determined that the corresponding target battery cell satisfies the fault determination condition, outputting a fault diagnosis result indicating that the SOC of the battery cell is low and a fault exists, including: and when it is determined that the corresponding target battery cell meets any one of the first fault judgment condition to the fourth fault judgment condition in a plurality of continuous analysis periods, outputting a fault diagnosis result representing that the target battery cell has a fault when the SOC is lower to the corresponding terminal equipment, so that the terminal equipment displays information.
Specifically, when the computer device determines that the corresponding target battery cell meets any one of the first fault judgment condition to the fourth fault judgment condition, it is determined that the voltage of the target battery cell in the middle and later stages of discharging is significantly low, and the voltage in the middle and later stages of charging is also low, so that it can be preliminarily determined that the target battery cell has a low SOC and a fault. In addition, if the computer device determines that the target battery cell has the above characteristics in a preset analysis period (for example, three analysis periods), the target battery cell is finally diagnosed to have a low SOC fault and needs to be maintained in time to ensure the normal operation of the lithium battery energy storage system.
Referring to fig. 2, an embodiment of the present application further provides a system 200 for diagnosing a low SOC fault of a battery cell, where the system 200 includes a data obtaining module 201, a first calculating module 202, a second calculating module 203, and a fault determining module 204, where:
the data acquisition module 201 is configured to determine total voltage data corresponding to each battery cluster in the lithium battery energy storage system, where each battery cluster includes a plurality of battery cells.
The first calculating module 202 is configured to calculate an average voltage value corresponding to each battery cluster according to total voltage data corresponding to the corresponding battery cluster and a total number of included battery cells.
The second calculating module 203 is configured to determine a fault determination condition according to the average voltage value, a preset cell voltage calibration value, a preset voltage difference value, and a cell voltage value of a cell in a preset working phase, for each cell in the same battery cluster; the working phase comprises at least one of a discharging phase, a standing phase after discharging and a charging phase.
And the fault judgment module 204 is configured to output a fault diagnosis result indicating that the SOC of the battery cell is relatively low and a fault exists when it is determined that the corresponding target battery cell satisfies the fault judgment condition.
In one embodiment, the first calculating module 202 is further configured to divide the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery cells, and determine an average voltage value corresponding to each battery cluster according to the obtained division result.
In one embodiment, the second calculation module 203 is further configured to, in the discharging phase, when it is determined that the average voltage value is greater than or equal to the cell voltage calibration value, and within a preset number of consecutive times, have a first fault determination condition that a voltage difference between the average voltage and the cell voltage value is greater than or equal to a preset first multiple of the voltage difference; in the discharging stage, when the average voltage is determined to be smaller than the monomer voltage calibration value, and in the continuous preset times, a second fault judgment condition exists, wherein the voltage difference between the average voltage and the monomer voltage value is greater than or equal to a preset second multiple of the voltage difference value; wherein the second multiple is greater than the first multiple; in the stage of standing after discharging, and within the determined continuous preset times, a third fault judgment condition exists, wherein the voltage difference between the average voltage and the single voltage value is greater than or equal to a preset third multiple of the voltage difference; wherein the second multiple is greater than the third multiple; and in a charging stage, the cell voltage value is smaller than the average voltage, and in the end charging stage, the larger the voltage difference between the cell voltage value and the average voltage is, the fourth fault judgment condition is.
In one embodiment, the fault determining module 204 is further configured to, when it is determined that the corresponding target battery cell satisfies any one of the first fault determining condition to the fourth fault determining condition in a plurality of consecutive analysis cycles, output a fault diagnosis result indicating that the target battery cell has a fault due to a low SOC to the corresponding terminal device, so as to display information by the terminal device.
Therefore, the system for diagnosing the low SOC faults of the single battery provided by the embodiment of the application compares the SOC at a certain moment with the SOC of the lowest single battery by analyzing the voltage characteristics of the single battery in the whole charging and discharging stages in the prior art, can effectively improve the overall diagnosis accuracy of the single battery, improves the overall operation efficiency of a lithium battery energy storage system, and reduces the false alarm rate of the low SOC fault diagnosis.
In a storage medium provided in an embodiment of the present application, when being executed by a processor, the computer program performs the method in any optional implementation manner of the foregoing embodiment. The storage medium may be implemented by any type of volatile or nonvolatile storage device or combination thereof, such as a Static Random Access Memory (SRAM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), an Erasable Programmable Read-Only Memory (EPROM), a Programmable Read-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic Memory, a flash Memory, a magnetic disk, or an optical disk.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some communication interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical, mechanical or other form.
In addition, 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.
Furthermore, the 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.
In this document, 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.
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.
Claims (9)
1. The method for diagnosing the low SOC fault of the battery monomer is characterized by comprising the following steps of:
determining total voltage data corresponding to each battery cluster in a lithium battery energy storage system, wherein each battery cluster comprises a plurality of battery monomers;
calculating the average voltage value corresponding to each battery cluster according to the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery monomers;
for each battery monomer in the same battery cluster, determining a fault judgment condition according to the average voltage value, a preset monomer voltage calibration value, a preset voltage difference value and a monomer voltage value of the battery monomer in a preset working stage; the working stage comprises at least one of a discharging stage, a standing stage after discharging and a charging stage;
and when the corresponding target battery monomer is determined to meet the fault judgment condition, outputting a fault diagnosis result representing that the SOC of the battery monomer is low and a fault exists.
2. The method according to claim 1, wherein the calculating an average voltage value corresponding to each of the battery clusters according to the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery cells comprises:
and performing division calculation on the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery monomers, and determining the average voltage value corresponding to each battery cluster according to the obtained division result.
3. The method of claim 1, wherein the fault decision condition comprises:
in the discharging stage, when the average voltage value is determined to be greater than or equal to the monomer voltage calibration value, and within the continuous preset times, a first fault judgment condition exists, wherein the voltage difference between the average voltage and the monomer voltage value is greater than or equal to a preset first multiple of the voltage difference;
in the discharging stage, when the average voltage is determined to be smaller than the monomer voltage calibration value, and in the continuous preset times, a second fault judgment condition exists, wherein the voltage difference between the average voltage and the monomer voltage value is greater than or equal to a preset second multiple of the voltage difference value; wherein the second multiple is greater than the first multiple;
in the stage of standing after discharging, and within the determined continuous preset times, a third fault judgment condition exists, wherein the voltage difference between the average voltage and the single voltage value is greater than or equal to a preset third multiple of the voltage difference; wherein the second multiple is greater than the third multiple;
and in a charging stage, the cell voltage value is smaller than the average voltage, and in the end charging stage, the larger the voltage difference between the cell voltage value and the average voltage is, the fourth fault judgment condition is.
4. The method according to claim 2, wherein outputting a fault diagnosis result indicating that the SOC of the corresponding target cell is low and a fault exists when it is determined that the corresponding target cell satisfies the fault determination condition includes:
and when it is determined that the corresponding target battery cell meets any one of the first fault judgment condition to the fourth fault judgment condition in a plurality of continuous analysis periods, outputting a fault diagnosis result representing that the target battery cell has a fault when the SOC is lower to the corresponding terminal equipment, so that the terminal equipment displays information.
5. The system for diagnosing the low SOC fault of the single battery is characterized by comprising a data acquisition module, a first calculation module, a second calculation module and a fault judgment module, wherein:
the data acquisition module is used for determining total voltage data corresponding to each battery cluster in a lithium battery energy storage system, wherein each battery cluster comprises a plurality of battery monomers;
the first calculating module is used for calculating average voltage values corresponding to the battery clusters respectively according to total voltage data corresponding to the corresponding battery clusters and the total number of the included battery monomers;
the second calculation module is used for determining a fault judgment condition according to the average voltage value, a preset monomer voltage calibration value, a preset voltage difference value and a monomer voltage value of each battery monomer in a preset working stage aiming at each battery monomer in the same battery cluster; the working stage comprises at least one of a discharging stage, a standing stage after discharging and a charging stage;
and the fault judgment module is used for outputting a fault diagnosis result representing that the SOC of the battery monomer is low and a fault exists when the corresponding target battery monomer is determined to meet the fault judgment condition.
6. The system of claim 5, wherein the first calculating module is further configured to divide the total voltage data corresponding to the corresponding battery cluster and the total number of the included battery cells, and determine an average voltage value corresponding to each battery cluster according to the dividing result.
7. The system of claim 5, wherein the second calculation module is further configured to, in the discharging phase, when it is determined that the average voltage value is greater than or equal to the cell voltage calibration value, and within a preset number of consecutive times, have a first fault determination condition that a voltage difference between the average voltage and the cell voltage value is greater than or equal to a preset first multiple of the voltage difference value; in the discharging stage, when the average voltage is determined to be smaller than the monomer voltage calibration value, and in the continuous preset times, a second fault judgment condition exists, wherein the voltage difference between the average voltage and the monomer voltage value is greater than or equal to a preset second multiple of the voltage difference value; wherein the second multiple is greater than the first multiple; in the stage of standing after discharging, and within the determined continuous preset times, a third fault judgment condition exists, wherein the voltage difference between the average voltage and the single voltage value is greater than or equal to a preset third multiple of the voltage difference; wherein the second multiple is greater than the third multiple; and in a charging stage, the cell voltage value is smaller than the average voltage, and in the end charging stage, the larger the voltage difference between the cell voltage value and the average voltage is, the fourth fault judgment condition is.
8. The system according to claim 6, wherein the fault determining module is further configured to, when it is determined that the corresponding target battery cell satisfies any one of the first to fourth fault determining conditions in a plurality of consecutive analysis cycles, output a fault diagnosis result indicating that the target battery cell has a low SOC and a fault to the corresponding terminal device for information display by the terminal device.
9. Readable storage medium, characterized in that the readable storage medium comprises a cell SOC low fault diagnosis method program, which when executed by a processor implements the steps of the method according to any one of claims 1 to 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115728662A (en) * | 2022-12-06 | 2023-03-03 | 北汽福田汽车股份有限公司 | Battery fault risk judgment method and device and vehicle |
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| CN115728662A (en) * | 2022-12-06 | 2023-03-03 | 北汽福田汽车股份有限公司 | Battery fault risk judgment method and device and vehicle |
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