CN117148185B - Method, device and storage medium for testing quiescent current of battery system - Google Patents
Method, device and storage medium for testing quiescent current of battery system Download PDFInfo
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- CN117148185B CN117148185B CN202311419503.8A CN202311419503A CN117148185B CN 117148185 B CN117148185 B CN 117148185B CN 202311419503 A CN202311419503 A CN 202311419503A CN 117148185 B CN117148185 B CN 117148185B
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- 238000012360 testing method Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003068 static effect Effects 0.000 claims abstract description 71
- 238000012545 processing Methods 0.000 claims abstract description 17
- 230000005856 abnormality Effects 0.000 claims abstract description 16
- 238000012935 Averaging Methods 0.000 claims abstract description 5
- 230000007958 sleep Effects 0.000 claims abstract description 4
- 238000010998 test method Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 4
- 238000012797 qualification Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 230000019371 dormancy process Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 14
- 230000005059 dormancy Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/003—Measuring mean values of current or voltage during a given time interval
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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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Abstract
The invention relates to a method, a device and a storage medium for testing the static current of a battery system, wherein the method comprises the following steps that S1, whether the battery system meets the testing conditions is judged, if yes, S2 is executed, if not, S1 is executed after alarming and abnormality processing are carried out; s2, after the battery system goes to sleep, acquiring static currents of the battery system at a plurality of time points, and correspondingly acquiring a plurality of static currents; s3, calculating an average value of a plurality of static currents; s4, calculating a current discrete value of the battery system according to the average value and the plurality of static currents; s5, judging whether the data are accurate or not according to the current discrete value, if so, executing S6, and if not, executing S2; s6, removing the maximum value and the minimum value in the plurality of static currents; s7, averaging the plurality of static currents with the maximum value and the minimum value removed to obtain a test value; s8, comparing the test value with a preset current threshold value to obtain test information. The invention can determine whether the time synchronization and the precision of the battery system meet the requirements in the dormancy process.
Description
Technical Field
The invention relates to the technical field of detection of automobile battery systems, in particular to a method and a device for testing the static current of a battery system and a storage medium.
Background
After the battery system is dormant, the static current values of all the electronic control units and the communication harness loop are added to obtain the static current of the battery system. The capacity of the battery system of the automobile is not equal to 5Ah-300Ah, taking the 5Ah battery system as an example, the quiescent current before dormancy is generally about 0.3A, and the battery system needs more than ten hours before dormancy after full charge, which may cause overdischarge of the battery, so that the quiescent current of the battery system after dormancy is generally less than 500 mu A under normal conditions, but due to the design defects of some controllers, the controllers cannot be dormant normally, and the quiescent current of the battery system is larger. In the prior art, therefore, a current detection device is generally used to detect the quiescent current of the battery system, resulting in
The quiescent current of the test battery system is inaccurate.
Disclosure of Invention
In order to solve the technical problems of inaccurate static current and the like of a battery system in the prior art, the invention provides a method, a device and a storage medium for testing the static current of the battery system.
The technical scheme for solving the technical problems is as follows:
a method of testing the quiescent current of a battery system, comprising the steps of:
s1, judging whether a battery system meets test conditions, if so, executing S2, otherwise, alarming the system abnormality and executing S1 again after processing the abnormality;
s2, after the battery system goes to sleep, acquiring static currents of the battery system at a plurality of time points, and correspondingly acquiring a plurality of static currents;
s3, calculating average values of a plurality of static currents;
s4, calculating a current discrete value of the battery system according to the average value and the plurality of static currents;
s5, judging whether the plurality of static currents are accurate or not according to the current discrete values, if so, executing S6, and if not, returning to execute S2;
s6, averaging the plurality of static currents with the maximum value and the minimum value removed to obtain a test value;
s7, comparing the test value with a preset current threshold value to obtain test information, and outputting the test information.
The beneficial effects of the invention are as follows: the static current value of the battery system is judged, the accuracy of the data is improved, the data with higher accuracy is selected for averaging calculation, and the obtained test result value is compared with a preset current value, so that the static current of the battery system after dormancy is accurately detected.
On the basis of the technical scheme, the invention can be improved as follows.
Further, whether the battery system meets the test condition is judged, if yes, S2 is executed, if not, S1 is executed again after system abnormality alarming and abnormality processing are carried out, and the method specifically comprises the following steps:
s100, acquiring the static voltage of the battery system;
s101, judging whether a test condition is met according to the static voltage, if so, executing S102, otherwise, processing an abnormality and re-executing S100;
s102, judging whether the battery system has faults or not according to BMS message data of the battery system, if so, giving out fault alarm, and re-executing S102 after eliminating the faults, otherwise, executing S2.
Further, the static voltage includes an operating voltage and a battery voltage of the battery system;
s101, judging whether a test condition is met according to the static voltage, if yes, executing S102, otherwise, processing the abnormality and re-executing S100, wherein the specific steps are as follows:
if the battery voltage is greater than or equal to the operating voltage, S102 is performed, and if the battery voltage is less than the operating voltage, it is determined that the battery system is abnormal and S100 is performed again.
Further, acquiring the static current of the battery system at a plurality of time points, and correspondingly acquiring a plurality of static currents, wherein the specific steps are as follows:
and acquiring positive pole static current and negative pole static current of the battery system at a plurality of continuous time points with the same time interval, and correspondingly acquiring the positive pole static current and the negative pole static current corresponding to each time point.
Further, the formula for calculating the average value of a plurality of the quiescent currents is as follows:
；
wherein,representing the average value, ++>Representing the positive quiescent current at time point 1 +.>Representing the positive quiescent current at time point 2,/v>Representing the positive quiescent current at the nth said point in time,said negative electrode quiescent current representing the 1 st said time point,/th>Said negative electrode quiescent current representing said time point of 2,/and->And the negative electrode quiescent current representing the nth time point, n representing the total number of the continuous multiple time points.
Further, the formula for calculating the current discrete value of the battery system is as follows:
；
wherein p represents the current discrete value.
Further, whether the plurality of static currents are accurate or not is judged according to the current discrete values, if yes, S6 is executed, if not, S2 is executed, and the specific steps are as follows:
if p is less than or equal to q, executing S6, and if p is more than q, returning to executing S2; where q represents a preset reliability threshold.
Further, comparing the test value with a preset current threshold value to obtain test information, and outputting the test information; the method comprises the following specific steps:
if the test value is smaller than or equal to the preset current threshold value, the test result is qualified, and qualified information and the test value are output; wherein the test information includes the qualification information and the test value;
if the test value is larger than the preset current threshold value, the test result is unqualified, and unqualified information and the test value are output; the test information comprises the unqualified information and the test value.
In order to solve the technical problems, the invention also provides a device for testing the static current of the battery system, which comprises the following specific technical contents:
an apparatus for testing the quiescent current of a battery system comprises a memory and one or more processors, wherein executable codes are stored in the memory, and the one or more processors realize the steps of the method for testing the quiescent current of the battery system when executing the executable codes.
In order to solve the technical problems, the invention also provides a storage medium, which comprises the following specific technical contents:
a storage medium storing a computer program or computer instructions which, when executed by a processor of a computer, implement the steps of the method of testing a battery system for quiescent current described above.
Drawings
FIG. 1 is a flow chart of a method for testing the quiescent current of a battery system according to an embodiment of the present invention;
fig. 2 is a block diagram of a static current testing system according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
As shown in fig. 1, the present embodiment provides a method for testing the quiescent current of a battery system, which includes the following steps:
s1, judging whether a battery system meets test conditions, if so, executing S2, otherwise, alarming the system abnormality and executing S1 again after processing the abnormality;
specifically, judging whether the battery system meets the test condition or not, specifically comprising the following steps:
s100, acquiring the static voltage of the battery system; wherein the static voltage comprises the working voltage and the battery voltage of the battery system;
s101, judging whether a test condition is met according to the static voltage, if so, executing S102, otherwise, processing an abnormality and re-executing S100; specifically, if the battery voltage is greater than or equal to the operating voltage, S102 is performed, and if the battery voltage is less than the operating voltage, S100 is performed again and abnormally of the battery system.
S102, judging whether the battery system has faults or not according to BMS message data of the battery system, giving out fault alarm if the faults occur, re-executing S102 after the faults are cleared, and executing S2 if the faults do not occur;
the BMS message data of the battery system is obtained from a VCU interface of the battery system through a CAN bus;
and collecting BMS message data of the battery system, feeding back whether the battery system has faults or not according to the BMS message data of the battery system, sending fault message nodes if the faults exist, recording the fault clearing times, and sending fault clearing records to a storage unit and storing the fault clearing records if the fault clearing times are greater than y, wherein y can be 1, 2, 3 or more than 3, and is preferably 3 times.
S2, after the battery system goes to sleep, acquiring static currents of the battery system at a plurality of time points, and correspondingly acquiring a plurality of static currents;
specifically, acquiring the static current of the battery system at a plurality of time points, and correspondingly acquiring a plurality of static currents, wherein the specific steps are as follows:
acquiring positive pole static current and negative pole static current of the battery system at a plurality of continuous time points at the same time interval, and correspondingly acquiring n positive pole static currents and n negative pole static currents; wherein n is a positive integer.
Collecting BMS data in a battery system to obtain a dormant time point T of the battery system; setting a critical current as o, wherein the critical current o can be 1 mu A, 2 mu A, 3 mu A, …, j and the like, the critical current o is preferably 500 mu A, and the time point t when the current of a power supply loop of the battery system is switched from being larger than the critical current to being smaller than the critical current o is acquired; by the formulaAnd calculating the time a required by the dormancy of the battery system, and outputting the result, namely the time a required by the dormancy of the battery system, to the detection result and storing the detection result.
The positive electrode static current is collected n times at fixed time intervals such as 1s, 2s, 3s, 4s, 5s, etc., preferably 1s、/>、/>、/>···/>Negative electrode quiescent current->、/>、/>、/>、···、/>The method comprises the steps of carrying out a first treatment on the surface of the Wherein n is 1, 2, 3, 4, 5, 6, …, n is preferably greater than or equal to 5, and the fixed time interval must be greater than or equal to the time a required by dormancy of the battery system, so as to ensure that the battery system enters a dormant state when collecting data, thereby improving the accuracy of data collection.
S3, calculating average values of a plurality of static currents;
wherein, the formula for calculating the average value of a plurality of the static currents is as follows:
；
wherein,representing the average value, ++>Representing the positive quiescent current at time point 1 +.>Representing the positive quiescent current at time point 2,/v>Representing the positive quiescent current at the nth said point in time,said negative electrode quiescent current representing the 1 st said time point,/th>Said negative electrode quiescent current representing said time point of 2,/and->And the negative electrode quiescent current representing the nth time point, n representing the total number of the continuous multiple time points.
S4, calculating a current discrete value of the battery system according to the average value and the plurality of static currents;
wherein, the formula for calculating the current discrete value of the battery system is as follows:
；
wherein p represents the current discrete value.
S5, judging whether the plurality of static current data are accurate or not according to the current discrete values, if so, executing S6, and if not, returning to execute S2;
specifically, whether the obtained plurality of static current data are accurate or not is judged according to the current discrete value, if yes, S6 is executed, if not, S2 is executed in a returning mode, and the specific steps are as follows:
if p is less than or equal to q, executing S6, and if p is more than q, returning to executing S2; wherein q represents a preset reliability threshold, q is a positive integer, and q is preferably 1.
S6, averaging the plurality of static currents with the maximum value and the minimum value removed to obtain a test value; removing maximum value in effective detection data in a plurality of static currentsMinimum->. The test value is calculated as follows:
；
wherein,representing the test value,/->，/>Representing a minimum value.
S7, comparing the test value with a preset current threshold value to obtain test information, and outputting the test information.
Specifically, the test value is compared with a preset current threshold value to obtain test information, and the test information is output; the method comprises the following specific steps:
if the test value is smaller than or equal to the preset current threshold value, the test result is qualified, and qualified information and the test value are output; wherein the test information includes the qualification information and the test value;
if the test value is larger than the preset current threshold value, the test result is unqualified, and unqualified information and the test value are output; the test information comprises the unqualified information and the test value. The preset current threshold is preferably 500 mua.
According to the embodiment of the invention, the voltage and current acquisition modules are respectively arranged at the positive electrode and the negative electrode of the battery system, so that the condition that the detection results are influenced due to overlong low-voltage beam loops or other reasons, such as voltage drop, is avoided, meanwhile, a plurality of groups of detection data are acquired, detection analysis is carried out on the detection data on line, whether the detection results are effective data or not is processed and analyzed through the voltage measurement and current measurement results of the static current test system, when the effective data are judged, the detection data are calculated to obtain more accurate and effective detection values, the detection results are rapidly obtained according to the detection standard, and therefore whether the test results meet development requirements is determined; therefore, whether the time synchronization and the precision of the battery system in the dormancy process meet the requirements can be determined.
Example 2
As shown in fig. 2, in the present embodiment, a quiescent current testing system is provided, which includes a current measurement module, wherein two ends of the current measurement module are respectively connected to the positive and negative electrodes of a low-voltage wire harness of a battery pack and the positive and negative electrodes of an uninterruptible voltage-stabilized power supply; and the voltage measurement module and the current measurement module are respectively connected with the data processing module. The data processing module is also connected with the VCU end of the battery system through a CAN/CANFD bus.
The current measuring module is used for detecting the current of the positive electrode and the negative electrode of the low-voltage wire harness of the battery pack and the current of the positive electrode and the negative electrode of the uninterrupted voltage stabilizing power supply; the voltage measurement module is used for detecting the static voltage in the battery system.
Example 3
Based on embodiment 1, the present embodiment provides an apparatus for testing a static current of a battery system, which includes a memory and one or more processors, wherein executable codes are stored in the memory, and when the one or more processors execute the executable codes, the steps of the above-mentioned earth surface deformation classification method based on SAE and CNN models are implemented.
The method for testing the static current of the battery system provided in the embodiment 1 is realized by using a computer, the calculation efficiency is improved by using the computer to realize the calculation method, the realization way of the method steps is provided, and the commercialized popularization is utilized.
Example 4
Based on embodiment 1, this embodiment provides a storage medium storing a computer program or computer instructions, which when executed by a processor of a computer, implement the steps of the above-described surface deformation classification method based on the SAE network and CNN model.
The storage medium may be an internal storage unit, such as a hard disk or a memory, of any of the data processing enabled devices described in any of the previous embodiments. The storage medium may be any external storage device that has a data processing capability, for example, a plug-in hard disk, a smart memory card, an SD card, a flash memory card, or the like, which is provided on the device. Further, the storage medium may include both internal storage units and external storage devices of any data processing device. The computer readable storage medium is used for storing the computer program and other programs and data required by the arbitrary data processing apparatus, and may also be used for temporarily storing data that has been output or is to be output.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A method of testing the quiescent current of a battery system, comprising the steps of:
s1, judging whether a battery system meets test conditions, if so, executing S2, otherwise, alarming the system abnormality and executing S1 again after processing the abnormality;
s2, after the battery system goes to sleep, acquiring static currents of the battery system at a plurality of time points, and correspondingly acquiring a plurality of static currents;
s3, calculating average values of a plurality of static currents;
s4, calculating a current discrete value of the battery system according to the average value and the plurality of static currents;
s5, judging whether the plurality of static currents are accurate or not according to the current discrete values, if so, executing S6, and if not, returning to execute S2;
s6, averaging the plurality of static currents with the maximum value and the minimum value removed to obtain a test value;
s7, comparing the test value with a preset current threshold value to obtain test information, and outputting the test information;
judging whether the battery system meets the test condition, if yes, executing S2, otherwise, alarming the system abnormality and executing S1 again after processing the abnormality, and specifically comprising the following steps:
s100, acquiring the static voltage of the battery system;
s101, judging whether a test condition is met according to the static voltage, if so, executing S102, otherwise, processing an abnormality and re-executing S100;
s102, judging whether the battery system has faults or not according to BMS message data of the battery system, giving out fault alarm if the faults occur, re-executing S102 after the faults are cleared, and executing S2 if the faults do not occur;
the static voltage comprises the working voltage and the battery voltage of the battery system;
s101, judging whether a test condition is met according to the static voltage, if yes, executing S102, otherwise, processing the abnormality and re-executing S100, wherein the specific steps are as follows:
if the battery voltage is greater than or equal to the operating voltage, S102 is performed, and if the battery voltage is less than the operating voltage, it is determined that the battery system is abnormal and S100 is performed again.
2. The method for testing the quiescent current of a battery system according to claim 1, wherein obtaining the quiescent current at a plurality of time points of the battery system corresponds to obtaining a plurality of the quiescent currents, comprises the following specific steps:
and acquiring positive pole static current and negative pole static current of the battery system at a plurality of continuous time points with the same time interval, and correspondingly acquiring the positive pole static current and the negative pole static current corresponding to each time point.
3. The method of testing the quiescent current of a battery system of claim 2, wherein the formula for calculating the average of a plurality of said quiescent currents is as follows:
；
wherein,representing the average value, ++>Representing the positive quiescent current at time point 1 +.>Representing the positive quiescent current at time point 2,/v>Representing the positive quiescent current of the nth said time point,/and->Said negative electrode quiescent current representing the 1 st said time point,/th>Said negative electrode quiescent current representing said time point of 2,/and->And the negative electrode quiescent current representing the nth time point, n representing the total number of the continuous multiple time points.
4. A method of testing the quiescent current of a battery system according to claim 3, wherein the formula for calculating the current discrete value of the battery system is as follows:
；
wherein p represents the current discrete value.
5. The method according to claim 4, wherein determining whether the plurality of static currents are accurate according to the current discrete values, if yes, executing S6, and if not, returning to executing S2 comprises the specific steps of:
if p is less than or equal to q, executing S6, and if p is more than q, returning to executing S2; where q represents a preset reliability threshold.
6. The method for testing the quiescent current of a battery system according to claim 1, wherein test information is obtained by comparing the test value with a preset current threshold value, and the test information is output; the method comprises the following specific steps:
if the test value is smaller than or equal to the preset current threshold value, the test result is qualified, and qualified information and the test value are output; wherein the test information includes the qualification information and the test value;
if the test value is larger than the preset current threshold value, the test result is unqualified, and unqualified information and the test value are output; the test information comprises the unqualified information and the test value.
7. An apparatus for testing the quiescent current of a battery system, comprising a memory and one or more processors, the memory having executable code stored therein, the one or more processors, when executing the executable code, performing the steps of the method for testing the quiescent current of a battery system as claimed in any one of claims 1 to 6.
8. A storage medium storing a computer program or computer instructions which, when executed by a processor of a computer, implement the steps of the method of testing a battery system for quiescent current as claimed in any one of claims 1 to 6.
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