CN118150095A - Battery pack vibration testing method, device, system, terminal and storage medium - Google Patents
Battery pack vibration testing method, device, system, terminal and storage medium Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The application relates to a battery pack vibration testing method, a device, a system, a terminal and a storage medium. The method comprises the following steps: acquiring first acceleration data obtained by road spectrum acquisition under a power conversion condition and second acceleration data obtained by road spectrum acquisition under a conventional working condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition; determining a test parameter according to the first acceleration data and the second acceleration data; and carrying out vibration test on the battery pack according to the test parameters to obtain a battery pack test result. The application can make the test more sufficient, and identify some product hidden troubles which are difficult to identify in the product research and development stage.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery pack vibration testing method, device, system, terminal and storage medium.
Background
With the development of new energy technology, development, manufacture and use of electric automobiles have also been rapidly developed. In the research and development and manufacturing process of the electric automobile, the vibration test of the battery pack is a very important test item, so that the design and optimization of the battery pack can be assisted, and the safety of the battery pack and the safety of the whole automobile are ensured.
At present, the flow of vibration test mainly comprises: and acquiring a road spectrum of the real vehicle, and testing the battery pack according to the acquired road spectrum by a testing system to obtain testing data.
However, conventional vibration testing has the problems of insufficient testing and difficult identification of part of hidden product hazards.
Disclosure of Invention
Based on the problems, the application provides a battery pack vibration testing method, device, system, terminal and storage medium, which not only consider the influence of load in the normal running process, but also consider the influence of disassembly and assembly in the power exchange process, so that the test is more sufficient, and some hidden product hazards which are difficult to identify can be identified in the product research and development stage.
In a first aspect, the present application provides a battery pack vibration testing method, the method comprising: acquiring first acceleration data obtained by road spectrum acquisition under a power conversion condition and second acceleration data obtained by road spectrum acquisition under a conventional working condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition; determining test parameters according to the first acceleration data and the second acceleration data; and carrying out vibration test on the battery pack according to the test parameters to obtain a battery pack test result.
According to the technical scheme, the influence of the load in the normal running process is considered, the influence of disassembly and assembly in the power conversion process is considered, the test is more complete, some hidden dangers of products which are difficult to identify can be identified in the product research and development stage, the research and development and production of the products can be guided, and the reliability and safety of the products are improved.
In some embodiments, determining the test parameter from the first acceleration data and the second acceleration data comprises: determining a first test parameter corresponding to the power conversion factor according to the first acceleration data; and determining a second test parameter corresponding to the normal working condition according to the second acceleration data. According to the technical scheme provided by the embodiment of the application, the test parameters of the power-changing working condition and the conventional working condition are respectively determined, so that the calculated amount of integrating acceleration data can be reduced, and the test complexity is reduced.
In some embodiments, vibration testing is performed on the battery pack according to the test parameters to obtain a battery pack test result, including: performing vibration test on the battery pack according to the first test parameters to obtain a first test result; performing vibration test on the battery pack according to the second test parameters to obtain a second test result; and determining a battery pack test result according to the first test result and the second test result. According to the technical scheme, vibration tests of the power conversion working condition and the conventional working condition are respectively carried out, so that the calculated amount of integrated acceleration data can be reduced, and the test complexity is reduced.
In some embodiments, determining a first test parameter corresponding to a power change factor from the first acceleration data comprises: counting the first acceleration data to obtain peak value data; and determining a first test parameter corresponding to the power conversion condition according to the peak value data. In the technical scheme of the embodiment of the application, the harsher test parameters can be determined by carrying out peak statistics, so that more hidden dangers of products can be identified by vibration test.
In some embodiments, obtaining first acceleration data obtained by road spectrum acquisition under a power conversion condition includes: first acceleration data are acquired from acceleration sensors arranged at a plurality of positions of the test vehicle, wherein the first acceleration data are acquired in the process of performing front packet replacement operation and rear packet replacement operation on the test vehicle under different power exchange conditions. In the technical scheme of the embodiment of the application, data acquisition is respectively carried out in the front packet replacement operation and the rear packet replacement operation, so that the influence of the front packet replacement and the influence of the rear packet replacement can be considered, and more accurate test parameters can be determined.
In some embodiments, the location of the acceleration sensor includes at least one of a battery pack bracket, a battery pack bottom, a front pack lock post, and a rear pack lock post; the first acceleration data includes at least one of rack acceleration data, bottom acceleration data, front pack acceleration data, and rear pack acceleration data. According to the technical scheme provided by the embodiment of the application, the plurality of acceleration sensors are arranged at different positions of the vehicle, so that the influence of power change on different positions of the vehicle can be considered, and more accurate test parameters can be determined.
In some embodiments, the method further comprises: acquiring first damage data corresponding to preset power conversion times and second damage data corresponding to preset driving mileage; and determining a power-changing damage evaluation result according to the first damage data and the second damage data. According to the technical scheme provided by the embodiment of the application, the damage of battery packs caused by battery replacement can be evaluated, the research, development and manufacturing of the battery packs are guided, and the safety and reliability of the battery packs are improved.
In a second aspect, the present application also provides a vibration testing apparatus for a battery pack, the apparatus comprising:
The acceleration data acquisition module is used for acquiring first acceleration data acquired by road spectrum acquisition under the power conversion condition and second acceleration data acquired by road spectrum acquisition under the conventional condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition;
The parameter determining module is used for determining test parameters according to the first acceleration data and the second acceleration data;
And the vibration testing module is used for carrying out vibration testing on the battery pack according to the testing parameters to obtain a battery pack testing result.
In a third aspect, the present application also provides a test system, the test system including a terminal and a vibration test bench;
The terminal is used for acquiring first acceleration data obtained by road spectrum acquisition under the power exchange condition and second acceleration data obtained by road spectrum acquisition under the conventional condition; determining test parameters according to the first acceleration data and the second acceleration data; controlling the vibration test bench according to the test parameters; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition;
And the vibration test bench is used for carrying out vibration test on the battery pack under the control of the terminal to obtain a battery pack test result.
In a fourth aspect, the application also provides a terminal comprising a memory storing a computer program and a processor implementing the method of any of the first aspects when executing the computer program.
In a fifth aspect, the present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the method of any of the first aspects.
In a sixth aspect, the application also provides a computer program product comprising a computer program which, when executed by a processor, implements the method of any of the first aspects.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the alternative embodiments. The drawings are only for purposes of illustrating alternative embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
FIG. 1 is a schematic diagram of a test system according to an embodiment of the application;
FIG. 2 is a flow chart of a method for testing vibration of a battery pack according to an embodiment of the application;
FIG. 3 is a flow chart of a determining test parameters and vibration testing steps according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating a step of determining test parameters according to an embodiment of the present application;
FIG. 5 is a flow chart illustrating a damage assessment procedure according to an embodiment of the present application;
FIG. 6 is a block diagram of an electrical package vibration testing apparatus according to an embodiment of the present application;
FIG. 7 is a block diagram of an electrical package vibration testing apparatus according to an embodiment of the present application;
Fig. 8 is an internal structural view of a terminal according to an embodiment of the present application.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
With the development of new energy technology, development, manufacture and use of electric automobiles have also been rapidly developed. In the research and development and manufacturing process of the electric automobile, the vibration test of the battery pack is a very important test item, so that the design and optimization of the battery pack can be assisted, and the safety of the battery pack and the safety of the whole automobile are ensured. At present, the flow of vibration test mainly comprises: and acquiring a road spectrum of the real vehicle, and testing the battery pack according to the acquired road spectrum by a testing system to obtain testing data. However, the electric vehicle may undergo the estimated ten thousand power-changing operations in the whole life cycle, that is, the electric vehicle needs to bear the influence of the load during the normal driving process and the disassembly and assembly during the power-changing process. However, the conventional vibration test generally only considers the influence of the load during normal running, but does not consider the influence of disassembly and assembly during power conversion, so that the test is insufficient, and part of hidden dangers of products are difficult to identify.
Aiming at the problems, the embodiment of the application provides a battery pack vibration scheme, which is used for acquiring first acceleration data acquired by road spectrum acquisition under a power exchange condition and second acceleration data acquired by road spectrum acquisition under a conventional working condition; determining test parameters according to the first acceleration data and the second acceleration data; and carrying out vibration test on the battery pack according to the test parameters to obtain a battery pack test result. According to the technical scheme, the influence of the load in the normal running process is considered, the influence of disassembly and assembly in the power conversion process is considered, the test is more complete, some hidden dangers of products which are difficult to identify can be identified in the product research and development stage, the research and development and production of the products can be guided, and the reliability and safety of the products are improved.
The battery pack vibration testing method provided by the embodiment of the application can be applied to an application environment shown in fig. 1. The application environment comprises a test system, wherein the test system comprises a terminal 101 and a vibration test bench 102; the terminal 101 communicates with the vibration test bench 102 through a network, and the terminal 101 can acquire various data, set test parameters, and control the vibration test bench 102 according to the test parameters. The vibration test bench 102 can fix the battery pack and perform X, Y, Z three-directional frequency sweeping and vibration impact under the control of the terminal 101, thereby performing vibration test on the battery pack. The terminal 101 may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and the like.
According to some embodiments of the present application, referring to fig. 2, a method for testing vibration of a battery pack is provided, and the method is applied to the terminal in fig. 1, and may include the following steps:
Step 201, obtaining first acceleration data obtained by road spectrum acquisition under a power conversion condition and second acceleration data obtained by road spectrum acquisition under a normal condition.
The power change working condition is a working condition of testing the vehicle to replace the battery pack, the conventional working condition is a working condition of testing the vehicle to replace the battery pack, and the conventional working condition is a driving working condition.
The test vehicle can replace a battery pack, run and the like, the acceleration sensor on the test vehicle acquires the road spectrum under the power conversion condition to obtain first acceleration data, and acquires the road spectrum under the normal condition to obtain second acceleration data.
The terminal can directly acquire the first acceleration data and the second acceleration data from the acceleration sensor, and can also acquire the first acceleration data and the second acceleration data which are stored in advance from a database.
It should be noted that, the manner in which the terminal acquires the acceleration data is not limited to the above description, and other manners may be adopted.
Step 202, determining test parameters according to the first acceleration data and the second acceleration data.
The test parameters may include, among others, the frequency sweep acceleration, the frequency sweep speed, and the Power spectral density (Power SPECTRAL DENSITY, PSD).
After the first acceleration data corresponding to the power conversion condition and the second acceleration data corresponding to the normal condition are obtained, the first acceleration data and the second acceleration data can be integrated first, and third acceleration data can be obtained. And then determining a test parameter according to the corresponding relation between the acceleration and the power spectrum density and the third acceleration data.
The integration of the first acceleration data and the second acceleration data may be to count extremum values in the first acceleration data and the second acceleration data, calculate average values of the first acceleration data and the second acceleration data, or adopt other integration methods.
The correspondence between the acceleration and the power spectral density includes: the power spectral density is equal to the square of the acceleration divided by the frequency. For example, PSD = a 2/f, where PSD is power spectral density, a is acceleration, and f is frequency.
And 203, performing vibration test on the battery pack according to the test parameters to obtain a battery pack test result.
The battery pack test results comprise vibration fatigue, battery pack predicted service life and the like.
After determining the power spectral density, the terminal may determine a vibration curve according to the power spectral density, and then control the vibration test bench according to the vibration curve; the vibration test bench performs vibration test on the battery pack under the control of the terminal; the terminal acquires the test data and determines a battery pack test result according to the test data.
The actual test can be referred to as follows:
1) Before testing, the initial state of the test sample is detected. Optionally, checking the appearance and the label of the test sample, and collecting images of the test sample; setting up a vibration test bench; checking sampling functions such as voltage, pressure difference, temperature and the like of the vibration test bench; checking the communication function of the test sample; and (5) carrying out image acquisition on the vibration test bench.
2) Insulation test: measuring insulation resistance between the anode, the cathode and the shell, and recording data; and (5) testing the air tightness of the water-cooled plate box body.
3) The testing process is provided with communication: and the upper computer is connected to monitor the total voltage of the test sample, the voltage and the temperature of the single battery cell, the insulation of the battery management system and other parameters and store the data of the upper computer.
4) Sweep in Z direction: sweep frequency before random vibration, wherein, sweep frequency acceleration: 0.5g, sweep speed: 1.0oct/min. It should be noted that, the scanning acceleration and the scanning speed may be set by the tester according to the actual situation and the historical test data, or may be default values.
5) Randomly vibrating in the Z direction: random vibration, wherein the power spectral density of the vibration may be determined from acceleration data obtained from power change and conventional conditions.
6) Sweep in Z direction: sweep frequency acceleration after random vibration: 0.5g, sweep speed: 1.0oct/min.
7) Checking and confirming: the appearance of the test sample was checked and it was judged whether the next vibration test was properly performed.
8) Y direction test: and (3) performing vibration test in the Y direction by referring to the test process in the Z direction.
9) X-direction test: and (3) performing vibration test in the X direction by referring to the test process in the Z direction.
10 Post-test detection: checking the appearance of the test sample and collecting images; insulation test: measuring insulation resistance between the anode, the cathode and the shell, and recording data; communication function and BMS insulation measurement: connecting an upper computer, successfully debugging and communicating, and recording the total voltage, the related cell voltage and the temperature; and (5) testing the air tightness of the water cooling plate and the air tightness of the box body.
It should be noted that, the above description shows one of the test flows, and other test flows may be adopted in practical applications.
In the above embodiment, the first acceleration data obtained by road spectrum acquisition under the power conversion condition and the second acceleration data obtained by road spectrum acquisition under the normal condition are obtained; determining test parameters according to the first acceleration data and the second acceleration data; and carrying out vibration test on the battery pack according to the test parameters to obtain a battery pack test result. According to the technical scheme, the influence of the load in the normal running process is considered, the influence of disassembly and assembly in the power conversion process is considered, the test is more complete, some hidden dangers of products which are difficult to identify can be identified in the product research and development stage, the research and development and production of the products can be guided, and the reliability and safety of the products are improved.
According to some embodiments of the present application, in one of the foregoing embodiments, the "determining the test parameter according to the first acceleration data and the second acceleration data" is to integrate the first acceleration data and the second acceleration data, and determine the test parameter according to the integrated third acceleration data. Referring to fig. 3, "determining a test parameter according to the first acceleration data and the second acceleration data" may also take another embodiment, and accordingly, "determining a test parameter according to the first acceleration data and the second acceleration data" and "performing a vibration test on a battery pack according to the test parameter to obtain a battery pack test result" may include the steps of:
Step 301, determining a first test parameter corresponding to the power conversion process according to the first acceleration data.
And determining the power spectral density under the power conversion condition according to the corresponding relation between the acceleration and the power spectral density and the first acceleration data to obtain a first test parameter corresponding to the power conversion condition.
And step 302, performing vibration test on the battery pack according to the first test parameters to obtain a first test result.
And the terminal controls the vibration test bench according to the first test parameters, and the vibration test bench performs vibration test on the battery pack according to the test flow in the embodiment to obtain a first test result corresponding to the battery replacement procedure.
Step 303, determining a second test parameter corresponding to the normal working condition according to the second acceleration data.
And determining the power spectral density under the conventional working condition according to the corresponding relation between the acceleration and the power spectral density and the second acceleration data to obtain a second test parameter corresponding to the conventional working condition.
And step 304, performing vibration test on the battery pack according to the second test parameters to obtain a second test result.
And the terminal controls the vibration test bench according to the second test parameters, and the vibration test bench performs vibration test on the battery pack according to the test flow in the embodiment to obtain a second test result corresponding to the conventional working condition.
Step 305, determining a battery pack test result according to the first test result and the second test result.
After the first test result and the second test result are obtained, the two test results can be accumulated to determine the test result of the battery pack. For example, if the first test result and the second test result are vibration fatigue degrees, the vibration fatigue degrees of the whole package can be obtained by adding the two vibration fatigue degrees. Or the first test result and the second test result are the predicted life of the battery pack, the predicted life of the battery pack of the second test result can be shortened according to the predicted life of the battery pack of the first test result, and the predicted life of the whole pack is obtained.
In the above embodiment, according to the first acceleration data, a first test parameter corresponding to the power conversion procedure is determined; performing vibration test on the battery pack according to the first test parameters to obtain a first test result; determining a second test parameter corresponding to the conventional working condition according to the second acceleration data; performing vibration test on the battery pack according to the second test parameters to obtain a second test result; and determining a battery pack test result according to the first test result and the second test result. According to the technical scheme provided by the embodiment of the application, the test parameters of the power-changing working condition and the conventional working condition are respectively determined, and the vibration test is respectively carried out, so that the calculated amount of integrating acceleration data can be reduced, and the test complexity is reduced.
According to some embodiments of the present application, the "obtaining the first acceleration data obtained by road spectrum acquisition under the power exchange condition" in the above embodiments may include: first acceleration data is acquired from acceleration sensors provided at a plurality of positions of a test vehicle.
The first acceleration data are collected in the process of performing front packet replacement operation and rear packet replacement operation on the test vehicle under different power exchange conditions.
The power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition. The empty load can be no person or only a driver in the test vehicle, the half load can be half of the number of passengers in the test vehicle, and the full load is the number of passengers in the test vehicle. The test vehicle may have two battery packs mounted in a position from the head to the tail.
Under the no-load power conversion condition, performing front-packet replacement operation on the test vehicle, and acquiring data by a plurality of acceleration sensors; and performing post-package replacement operation on the test vehicle, and acquiring data by a plurality of acceleration sensors. Under the half-load power exchange condition, performing front-packet replacement operation on the test vehicle, and acquiring data by a plurality of acceleration sensors; and performing post-package replacement operation on the test vehicle, and acquiring data by a plurality of acceleration sensors. Under the full-load power exchange condition, performing front-packet replacement operation on the test vehicle, and acquiring data by a plurality of acceleration sensors; and performing post-package replacement operation on the test vehicle, and acquiring data by a plurality of acceleration sensors.
In each power conversion condition, the front packet substitution operation and the rear packet substitution operation may be continuous operations or separate operations. For example, under the no-load power conversion condition, the test vehicle is subjected to front-packet replacement operation, a plurality of acceleration sensors are used for data acquisition, and the process is repeated for a preset number of times. And then, under the no-load power conversion condition, carrying out post-package replacement operation on the test vehicle, carrying out data acquisition on a plurality of acceleration sensors, and repeating the process for preset times. Or under the no-load power conversion condition, carrying out front-packet replacement operation on the test vehicle, and collecting data by a plurality of acceleration sensors; and carrying out post-package replacement operation on the test vehicle, and collecting data by a plurality of acceleration sensors. After that, the above-mentioned process is repeated for a preset number of times. The preset times may be 10 times.
In some embodiments, the location of the acceleration sensor includes at least one of a battery pack bracket, a battery pack bottom, a front pack lock post, and a rear pack lock post; the first acceleration data includes at least one of rack acceleration data, bottom acceleration data, front pack acceleration data, and rear pack acceleration data.
Acceleration sensors may be provided in advance at a plurality of positions of the test vehicle. The battery pack bracket can be provided with 3 acceleration sensors respectively arranged at the left front part of the bracket locking, the right front part of the bracket locking and the right middle part of the bracket locking. The bottom of the battery pack can be provided with 2 acceleration sensors, and the front pack and the rear pack are respectively arranged at the bottom of the battery pack. The front wrapping lock column can be provided with 4 acceleration sensors respectively at the left front of the front wrapping lock column, the right front of the front wrapping lock column, the left rear of the front wrapping lock column and the right rear of the front wrapping lock column. The rear wrapping lock column can be provided with 4 acceleration sensors respectively at the left front of the rear wrapping lock column, the right front of the rear wrapping lock column, the left rear of the rear wrapping lock column and the right rear of the rear wrapping lock column.
The position of the acceleration sensor is not limited to the above position, and may be provided at other positions.
The acceleration sensor arranged on the battery pack bracket performs data acquisition in three directions of X, Y, Z in the front pack replacement operation process and the rear pack replacement process to obtain bracket acceleration data, as shown in table 1.
TABLE 1
The acceleration sensor arranged at the bottom of the battery pack performs data acquisition in three directions X, Y, Z in the front pack replacement operation process and the rear pack replacement process, so as to obtain bottom acceleration data, as shown in table 2.
TABLE 2
The acceleration sensor arranged on the front packet lock column performs data acquisition in three directions of X, Y, Z in the front packet replacement operation process and the rear packet replacement process, so as to obtain front packet acceleration data, as shown in table 3.
TABLE 3 Table 3
The acceleration sensor arranged on the post-package lock column performs data acquisition in three directions of X, Y, Z in the front package replacement operation process and the post-package replacement process, so as to obtain post-package acceleration data, as shown in table 4.
TABLE 4 Table 4
It should be noted that, the sensor may also perform data acquisition under the conventional working condition, so as to obtain the second acceleration data under the conventional working condition.
In the above embodiment, the first acceleration data is acquired from the acceleration sensors provided at a plurality of positions of the test vehicle, and the first acceleration data is acquired during the front packet replacement operation and the rear packet replacement operation performed on the test vehicle under different power change conditions. In the technical scheme of the embodiment of the application, data acquisition is respectively carried out in the front packet replacement operation and the rear packet replacement operation, so that the influence of the front packet replacement and the influence of the rear packet replacement can be considered, and a plurality of acceleration sensors are arranged at different positions of the vehicle, so that the influence of the battery replacement on different positions of the vehicle can be considered, and more accurate test parameters can be determined.
According to some embodiments of the present application, referring to fig. 4, "determining a first test parameter corresponding to the power conversion process according to the first acceleration data" in the above embodiment may include the following steps:
Step 401, counting the first acceleration data to obtain peak value data.
Wherein the peak data is the peak value of the acceleration data.
The first acceleration data includes bracket acceleration data, bottom acceleration data, front pack acceleration data, and rear pack acceleration data. The bracket acceleration data, the bottom acceleration data, the front packet acceleration data and the rear packet acceleration data can be counted respectively to obtain bracket peak value data, bottom peak value data, front packet peak value data and rear packet peak value data. The bracket peak value data can also be obtained by counting the bracket acceleration data, and the whole-package peak value data can be obtained by counting the bottom acceleration data, the front-package acceleration data and the rear-package acceleration data.
The statistics may be performed for extrema or average values, which are not limited in the embodiment of the present application. The statistical results are shown in Table 5, where the pulse width is 0.6/ms.
TABLE 5
Step 402, determining a first test parameter corresponding to the power conversion process according to the peak value data.
The terminal can obtain a first test parameter corresponding to the power conversion factor according to the bracket peak value data obtained by counting the extreme value and the corresponding relation between the acceleration and the power spectrum density; and the first test parameters corresponding to the power conversion power can also be obtained according to the bracket peak value data obtained by statistics aiming at the mean value and the corresponding relation between the acceleration and the power spectrum density. For example, taking the stent peak data as acceleration, then substituting the acceleration into the formula psd=a 2/f calculates the power spectral density, which is the first test parameter.
Or the terminal can obtain a first test parameter corresponding to the power conversion factor according to the whole packet peak value data obtained by counting the extremum and the corresponding relation between the acceleration and the power spectrum density; and the first test parameters corresponding to the power conversion condition can be obtained according to the whole packet peak value data obtained by statistics aiming at the mean value and the corresponding relation between the acceleration and the power spectrum density. For example, taking the whole packet peak data as acceleration, then substituting the acceleration into the formula psd=a 2/f calculates a power spectral density, which is the first test parameter.
Or the terminal can obtain a first test parameter corresponding to the power conversion factor according to the bracket peak value data and the whole packet peak value data obtained by counting the extreme value and the corresponding relation between the acceleration and the power spectrum density; and the first test parameters corresponding to the power conversion process can also be obtained according to the bracket peak value data and the whole package peak value data which are obtained by statistics aiming at the mean value and the corresponding relation between the acceleration and the power spectrum density.
It should be noted that, according to the above manner, the second acceleration data under the conventional working condition may be counted, and then the second test parameter corresponding to the conventional working condition is determined according to the counted result.
In the above embodiment, the first acceleration data is counted to obtain the peak value data; and determining a first test parameter corresponding to the power conversion condition according to the peak value data. In the technical scheme of the embodiment of the application, the harsher test parameters can be determined by carrying out peak statistics, so that more hidden dangers of products can be identified by vibration test.
According to some embodiments of the present application, referring to fig. 5, the steps of:
Step 501, obtaining first damage data corresponding to preset power conversion times and second damage data corresponding to preset driving mileage.
In the testing process, stress sensors can be further arranged at the right back of the front wrapping lock column, the left back of the front wrapping lock column, the right front of the front wrapping lock column, the right back of the rear wrapping lock column, the left back of the rear wrapping lock column, the center of the rear wrapping lock column, the right front of the rear wrapping lock column and the right back of the rear wrapping lock column.
Under different power exchange conditions, the stress sensor can acquire data of stress born by the battery pack to obtain stress data. The terminal can determine damage data corresponding to single power conversion according to the stress data; and determining first damage data corresponding to the preset power change times according to the damage data corresponding to the single power change.
The terminal can also determine damage of the preset driving mileage of the tested vehicle to the battery pack according to the historical test data, and second damage data are obtained.
Step 502, determining a power-changing damage evaluation result according to the first damage data and the second damage data.
The terminal can calculate the ratio of the first damage data to the second damage data to obtain the ratio of the damage caused by power conversion. For example, the test vehicle experiences damage from ten thousand power changes over the life cycle, accounting for about 9% of the damage caused by traveling 60 km of road surface.
In the above embodiment, the first damage data corresponding to the preset power conversion times and the second damage data corresponding to the preset driving mileage are obtained; and determining a power-changing damage evaluation result according to the first damage data and the second damage data. According to the technical scheme provided by the embodiment of the application, the damage of battery packs caused by battery replacement can be evaluated, the research, development and manufacturing of the battery packs are guided, and the safety and reliability of the battery packs are improved.
According to some embodiments of the present application, a method for testing vibration of a battery pack is provided, and the method is applied to a terminal in fig. 1, and may include the following steps:
step 1, acquiring first acceleration degrees from acceleration sensors arranged at a plurality of positions of a test vehicle.
The first acceleration data are collected in the process of performing front packet replacement operation and rear packet replacement operation on the test vehicle under different power exchange conditions.
The power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition.
The position of the acceleration sensor comprises at least one of a vehicle bracket, a bottom, a front bag lock column and a rear bag lock column; the first acceleration data includes at least one of rack acceleration data, bottom acceleration data, front pack acceleration data, and rear pack acceleration data.
And step 2, acquiring second acceleration data obtained by road spectrum acquisition under the conventional working condition.
Step 3, counting the first acceleration data to obtain first peak value data; and determining a first test parameter corresponding to the power conversion factor according to the first peak value data.
And step 4, performing vibration test on the battery pack according to the first test parameters to obtain a first test result.
Step 5, counting the second acceleration data to obtain second peak value data; and determining a second test parameter corresponding to the normal working condition according to the second peak value data.
And 6, performing vibration test on the battery pack according to the second test parameters to obtain a second test result.
And 7, determining a battery pack test result according to the first test result and the second test result.
In the above embodiment, under different power exchanging conditions, the front packet replacing operation and the rear packet replacing operation are performed on the test vehicle, and data acquisition is performed to obtain the first acceleration data, and similarly, data acquisition is performed under the normal working condition to obtain the second acceleration data. And then, the terminal acquires the first acceleration data and the second acceleration data and performs data statistics. And then, determining a first test parameter of the power conversion working condition and a second test parameter of the normal working condition according to the statistical result, and controlling the vibration test bench according to the first test parameter and the second test parameter respectively. The vibration test bench performs vibration test on the battery pack under the control of the terminal. The terminal acquires test data of two stages, and determines a battery pack test result according to the test data of the two stages. According to the technical scheme, the influence of the load in the normal running process is considered, the influence of disassembly and assembly in the power conversion process is considered, the test is more complete, some hidden dangers of products which are difficult to identify can be identified in the product research and development stage, the research and development and production of the products can be guided, and the reliability and safety of the products are improved.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described above may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of execution of the steps or stages is not necessarily sequential, but may be performed in turn or alternately with at least a part of other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a battery pack vibration device for realizing the battery pack vibration method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitations in the embodiments of the battery pack vibration device or devices provided below can be referred to above for the limitations of the battery pack vibration method, and will not be repeated here.
According to some embodiments of the present application, referring to fig. 6, there is provided a battery pack vibration testing apparatus including:
The acceleration data acquisition module 601 is configured to acquire first acceleration data acquired by road spectrum acquisition under a power conversion condition and second acceleration data acquired by road spectrum acquisition under a normal condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition;
a parameter determining module 602, configured to determine a test parameter according to the first acceleration data and the second acceleration data;
and the vibration testing module 603 is configured to perform vibration testing on the battery pack according to the testing parameters, so as to obtain a battery pack testing result.
In some embodiments, the parameter determining module 602 is specifically configured to determine, according to the first acceleration data, a first test parameter corresponding to the power conversion factor; and determining a second test parameter corresponding to the normal working condition according to the second acceleration data.
In some embodiments, the vibration testing module 603 is configured to perform a vibration test on the battery pack according to the first test parameter, to obtain a first test result; performing vibration test on the battery pack according to the second test parameters to obtain a second test result; and determining a battery pack test result according to the first test result and the second test result.
In some embodiments, the parameter determining module 602 is specifically configured to count the first acceleration data to obtain peak data; and determining a first test parameter corresponding to the power conversion condition according to the peak value data.
In some embodiments, the acceleration data obtaining module 601 is specifically configured to obtain first acceleration data from acceleration sensors disposed at a plurality of positions of the test vehicle, where the first acceleration data is collected during a front packet replacement operation and a rear packet replacement operation performed on the test vehicle under different power exchange conditions.
In some embodiments, the location of the acceleration sensor includes at least one of a battery pack bracket, a battery pack bottom, a front pack lock post, and a rear pack lock post; the first acceleration data includes at least one of rack acceleration data, bottom acceleration data, front pack acceleration data, and rear pack acceleration data.
In some embodiments, referring to fig. 7, the apparatus further comprises:
The damage data acquisition module 604 is configured to acquire first damage data corresponding to a preset number of power changes and second damage data corresponding to a preset driving range;
The damage evaluation module 605 is configured to determine a power-change damage evaluation result according to the first damage data and the second damage data.
The respective modules in the above-described battery pack vibration device may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or independent of a processor in the electronic device, or may be stored in software in a memory in the electronic device, so that the processor may call and execute operations corresponding to the above modules.
According to some embodiments of the present application, a test system is provided. As shown in fig. 1, the test system includes a terminal 101 and a vibration test bench 102; the terminal 102 is used for acquiring first acceleration data obtained by road spectrum acquisition under a power conversion condition and second acceleration data obtained by road spectrum acquisition under a conventional condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition; determining test parameters according to the first acceleration data and the second acceleration data; controlling the vibration test bench according to the test parameters; and the vibration test bench 102 is used for performing vibration test on the battery pack under the control of the terminal to obtain a battery pack test result.
According to the technical scheme, the test system can automatically perform vibration tests of the power exchange working condition and the conventional working condition, the influence of loads in the normal running process is considered, the influence of disassembly and assembly in the power exchange process is considered, the test is more sufficient, some hidden dangers of products which are difficult to identify can be identified in the product research and development stage, the research and development and production of the products can be guided, and the reliability and safety of the products are improved.
According to some embodiments of the present application, there is provided a terminal, an internal structure of which may be as shown in fig. 8. The terminal includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input device. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the terminal is adapted to provide computing and control capabilities. The memory of the terminal includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the terminal is used for exchanging information between the processor and the external device. The communication interface of the terminal is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor implements a battery pack vibration method. The display unit of the terminal is used for forming a visual picture and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the terminal can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the terminal shell, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of a portion of the structure associated with the present inventive arrangements and is not limiting of the terminal to which the present inventive arrangements are applied, and that a particular terminal may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
According to some embodiments of the present application, there is also provided a non-transitory computer-readable storage medium, such as a memory, comprising instructions executable by a processor of an electronic device to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
According to some embodiments of the present application, there is also provided a computer program product, which, when executed by a processor, can implement the above-mentioned method. The computer program product includes one or more computer instructions. When loaded and executed on a computer, these computer instructions may implement some or all of the methods described above, in whole or in part, in accordance with the processes or functions described in embodiments of the present application.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which facilitate a specific and detailed understanding of the technical solutions of the present application, but are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. It should be understood that, based on the technical solutions provided by the present application, those skilled in the art obtain technical solutions through logical analysis, reasoning or limited experiments, all of which are within the scope of protection of the appended claims. The scope of the patent is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted as illustrative of the contents of the claims.
Claims (11)
1. A method for testing vibration of a battery pack, the method comprising:
Acquiring first acceleration data obtained by road spectrum acquisition under a power conversion condition and second acceleration data obtained by road spectrum acquisition under a conventional working condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition;
Determining a test parameter according to the first acceleration data and the second acceleration data;
And carrying out vibration test on the battery pack according to the test parameters to obtain a battery pack test result.
2. The method of claim 1, wherein determining the test parameter from the first acceleration data and the second acceleration data comprises:
Determining a first test parameter corresponding to the power conversion factor according to the first acceleration data;
and determining a second test parameter corresponding to the normal working condition according to the second acceleration data.
3. The method according to claim 2, wherein the performing vibration test on the battery pack according to the test parameters to obtain a battery pack test result comprises:
performing vibration test on the battery pack according to the first test parameters to obtain a first test result;
Performing vibration test on the battery pack according to the second test parameters to obtain a second test result;
and determining the battery pack test result according to the first test result and the second test result.
4. The method of claim 2, wherein determining a first test parameter corresponding to the power change factor from the first acceleration data comprises:
Counting the first acceleration data to obtain peak value data;
And determining a first test parameter corresponding to the power conversion factor according to the peak value data.
5. The method according to any one of claims 1 to 4, wherein the obtaining the first acceleration data obtained by road spectrum acquisition under the power conversion condition includes:
the first acceleration data are acquired from acceleration sensors arranged at a plurality of positions of a test vehicle, wherein the first acceleration data are acquired in the process of performing front packet replacement operation and rear packet replacement operation on the test vehicle under different power change conditions.
6. The method of claim 5, wherein the location of the acceleration sensor comprises at least one of a battery pack bracket, a battery pack bottom, a front pack lock post, and a rear pack lock post;
The first acceleration data includes at least one of bracket acceleration data, bottom acceleration data, front pack acceleration data, and rear pack acceleration data.
7. The method according to claim 1, wherein the method further comprises:
Acquiring first damage data corresponding to preset power conversion times and second damage data corresponding to preset driving mileage;
and determining a power-changing damage evaluation result according to the first damage data and the second damage data.
8. A battery pack vibration testing apparatus, the apparatus comprising:
The acceleration data acquisition module is used for acquiring first acceleration data acquired by road spectrum acquisition under the power conversion condition and second acceleration data acquired by road spectrum acquisition under the conventional condition; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition;
The parameter determining module is used for determining test parameters according to the first acceleration data and the second acceleration data;
and the vibration testing module is used for carrying out vibration testing on the battery pack according to the testing parameters to obtain a battery pack testing result.
9. A test system comprising a terminal and a vibration test bench;
The terminal is used for acquiring first acceleration data obtained by road spectrum acquisition under the power exchange condition and second acceleration data obtained by road spectrum acquisition under the conventional condition; determining a test parameter according to the first acceleration data and the second acceleration data; and controlling the vibration test bench according to the test parameters; the power conversion working condition comprises at least one of an idle power conversion working condition, a half-load power conversion working condition and a full-load power conversion working condition;
the vibration test bench is used for carrying out vibration test on the battery pack under the control of the terminal to obtain a battery pack test result.
10. A terminal comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the method of any of claims 1 to 7 when executing the computer program.
11. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of any of claims 1 to 7.
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