CN112834942A - Battery management system service life testing method and device based on temperature alternation test - Google Patents
Battery management system service life testing method and device based on temperature alternation test Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention relates to a battery management system service life testing method and device based on a temperature alternation test, and belongs to the technical field of service life testing of electronic and electrical components. The test method comprises the following steps: determining the highest temperature and the lowest temperature of the cycle test and the design cycle number; calculating an acceleration factor by using a temperature alternating acceleration model according to the highest temperature and the lowest temperature; and obtaining the duration of a single cycle according to the maximum temperature and the minimum temperature; obtaining test cycle times according to the acceleration factors and the design cycle times; and obtaining the total test time length according to the test cycle times and the time length of the single cycle. According to the invention, the acceleration factor of the temperature alternation test is obtained through the temperature alternation acceleration model, the total duration of the test is further determined, the test scheme of the alternation test is formulated, and the accelerated aging life test is carried out on the battery management system, so that the test period is shortened, the test efficiency is improved, and the test cost is reduced.
Description
Technical Field
The invention relates to a battery management system service life testing method and device based on a temperature alternation test, and belongs to the technical field of service life testing of electronic and electrical components.
Background
With the increasing demand of the reliability level of products, products with high reliability and long service life are required in many occasions, for example, the service life and the storage life of the products for vehicles with high reliability and high safety are long, so that the service life data of the products are required to be obtained, and the reliability of the products is required to be evaluated.
By adopting the traditional environment test, the service life of the product cannot be effectively estimated, the product can only be proved to work normally under the severe environment, and the traditional service life prediction method is difficult to realize in engineering from the aspect of test duration. Such as: the current vehicle battery management system generally requires a design life of 10 years and an actual service life of 8 years, more importantly, the design life needs to meet 15 years, and the actual service life meets 12 years; in the actual development verification test of the product, the service life characteristic of the product cannot be verified by consuming such a long time, so that the test period is long, the test cost is high, the efficiency is low, and the design development, the popularization and the application of the product are seriously influenced. In order to shorten the life prediction test period, reduce the test cost and obtain the life reliability information of the product in a short time, an accelerated life test prediction method is urgently needed.
Therefore, it is proposed to accelerate the life test of the battery management system by using a temperature alternation test, however, the existing temperature alternation test only determines the test time according to experience, which results in that the test time cannot be accurately determined, and further results in inaccurate test results.
Disclosure of Invention
The application aims to provide a battery management system service life testing method and device based on a temperature alternation test, and the method and device are used for solving the problem that the existing temperature alternation test cannot accurately determine the duration, so that the testing result is inaccurate.
In order to achieve the purpose, the invention provides a battery management system service life testing method based on a temperature alternation test, which comprises the following steps:
determining the highest temperature and the lowest temperature of the cycle test and the design cycle number;
calculating an acceleration factor by using a temperature alternating acceleration model according to the highest temperature and the lowest temperature; and obtaining the duration of a single cycle according to the maximum temperature and the minimum temperature;
obtaining test cycle times according to the acceleration factors and the design cycle times;
and obtaining the total test time length according to the test cycle times and the time length of the single cycle.
In addition, the invention also provides a battery management system service life testing device based on the temperature alternation test, which comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory so as to realize the battery management system service life testing method based on the temperature alternation test.
The beneficial effects are that: according to the invention, the acceleration factor of the temperature alternation test is obtained through the temperature alternation acceleration model, so that the total duration of the test is accurately determined, the test scheme of the alternation test is formulated, and the accelerated aging life test is carried out on the battery management system, so that the test period is shortened, the test efficiency is improved, and the test cost is reduced.
Further, in the method and the device for testing the service life of the battery management system based on the temperature alternation test, in order to improve the accuracy of the alternation test, the temperature alternation acceleration model is a coffee-Manson model, and the coffee-Manson model is as follows:
wherein A isCMIs an acceleration factor; delta TTestTo circulateThe difference between the highest and lowest temperatures tested; delta TFeldAverage temperature difference for working temperature within design life; c is the index of the Coffin-Manson model.
Further, in the method and the device for testing the service life of the battery management system based on the temperature alternation test, in order to determine the time length of a single cycle, the time length of the single cycle is calculated in the following manner:
t＝2*(ΔTTest/v+t0+t1)；
wherein t is the duration of a single cycle; delta TTestThe difference value of the highest temperature and the lowest temperature of the cycle test is shown; v is the test temperature rate of change; t is t0Testing the temperature permeation time; t is t1The temperature hold time was tested.
Further, in the method and the device for testing the service life of the battery management system based on the temperature alternation test, in order to determine the number of test cycles, the number of test cycles is calculated in the following manner:
wherein N isPrufThe number of test cycles; n is a radical ofTempzyklenFeldThe number of cycles is designed.
Further, in the method and the device for testing the service life of the battery management system based on the temperature alternation test, in order to improve the accuracy of the design cycle number, the design cycle number is corrected in a manner that: and screening the originally collected design life data by using the confidence coefficient.
Further, in the method and the device for testing the service life of the battery management system based on the temperature alternation test, in order to shorten the test duration, if the number of the battery management systems to be tested is N, the duration of the temperature alternation test of each battery management system is calculated in the following manner:
t'Pruf＝tPruf/N；
wherein, t'PrufFor the duration of the temperature ramp test for each battery management system,tPrufis the total length of the test.
Drawings
FIG. 1 is a temperature ramp accelerated life test temperature profile of the present invention.
Detailed Description
The embodiment of the battery management system service life testing method based on the temperature alternation test comprises the following steps:
the method for testing the service life of the battery management system based on the temperature alternation test comprises the following steps:
1) the maximum temperature, the minimum temperature, and the design cycle number of the cycle test are determined.
The temperature alternation test is a cycle test, and the maximum temperature, the minimum temperature and the designed cycle number of the cycle test need to be determined before the cycle test is carried out.
The design cycle number is the cycle number of the battery management system within the design life and at the working temperature. In this embodiment, in order to ensure the accuracy of the design cycle count, the design cycle count is corrected in the following manner: and screening the originally collected design life data by using the confidence coefficient. The method specifically comprises the following steps:
NTempzyklenFeld＝N'TempzyklenFeld*B/2；
wherein N isTempzyklenFeldTo design number of cycles, N'TempzyklenFeldThe number of cycles for the original acquisition design, B is the scaling factor within the confidence interval.
As another embodiment, the design cycle number of the original acquisition may be directly used without correcting the design lifetime.
Originally acquired design cycle number N'TempzyklenFeldThe calculation method is as follows:
N′TempzyklenFeld＝ts*n；
wherein, tsLength of operation (in days) for the design life; and n is the number of working temperature cycles per day and can be set according to requirements.
2) Calculating an acceleration factor by using a temperature alternating acceleration model according to the highest temperature and the lowest temperature; and the duration of a single cycle is derived from the maximum and minimum temperatures.
In this embodiment, the temperature alternation acceleration model is a coffee-Manson model, and the coffee-Manson model is:
wherein A isCMIs an acceleration factor; delta TTestThe difference value of the highest temperature and the lowest temperature of the cycle test is shown; delta TFeldAverage temperature difference for working temperature within design life; c is the index of the Coffin-Manson model.
As another embodiment, another temperature alternation acceleration model may be used as long as the acceleration factor can be calculated.
The duration of a single cycle is calculated as follows:
t＝2*(ΔTTest/v+t0+t1)；
wherein t is the duration of a single cycle; delta TTestThe difference value of the highest temperature and the lowest temperature of the cycle test is shown; v is the test temperature rate of change; t is t0Testing the temperature permeation time; t is t1The temperature hold time was tested.
3) And obtaining the test cycle number according to the acceleration factor and the design cycle number.
In this embodiment, the calculation method of the number of test cycles is as follows:
wherein N isPrufThe number of test cycles; n is a radical ofTempzyklenFeldThe number of cycles is designed.
4) And obtaining the total test time length according to the test cycle times and the time length of the single cycle.
The total duration of the test is the number of test cycles times the duration of a single cycle. In this embodiment, the test duration is shortened by increasing the number of the battery management systems to be tested, and if the number of the battery management systems to be tested is N, the calculation manner of the duration of the temperature alternation test of each battery management system is as follows:
t'Pruf＝tPruf/N；
wherein, t'PrufDuration of temperature alternation test, t, for each battery management systemPrufIs the total length of the test.
In other embodiments, the test may be performed by one battery management system, and the test duration is the total duration of the test.
Finally obtaining a test temperature curve of the temperature alternation test as shown in figure 1, wherein Tmax is the highest test temperature in the cycle test; TRT is room temperature; tmin is the lowest test temperature in the cycle test; t2 is low temperature hold and soak time; t3 and t5 are temperature change times; t4 is the elevated temperature hold and permeation time.
The process of the present invention is illustrated below with a specific example.
Assuming that the design life of the vehicle battery management system is 10 years, the working time of the design life is 10 × 365-3650 days; the daily working temperature cycle number is 2 (the actual value needs to be determined according to the application scene), and the original design cycle number N 'is obtained'TempzyklenFeld10 × 365 × 2 × 7300 times.
The confidence of the test data in the design life is assumed to be 95%; the failure number in the actual time length is 0; the scale factor with 95% confidence interval is 6 (lookup table X2 mapping table), and the number of design cycles N after correctionTempzyklenFeld7300 × 6/2 × 21900 times.
Generally, the highest temperature and the lowest temperature are selected to be 85 ℃ and-40 ℃ respectively and delta T is selected during the circulation testTestThe temperature is 125 ℃; the average temperature difference (namely the average temperature difference of the working temperature within the design life) of the product under the actual working environment is delta TFeldThe temperature is 30 ℃; c is related to the material characteristics of the product, and the automobile electronic product is generally selected to be 2.5 to obtain ACM(125/30) ^2.5 ^ 35.44, and then obtain NPruf21900/35.44 times 618 times.
The test time is related to the temperature holding time by the temperature change rate and the temperature permeation time in a single temperature alternating cycle; typically, the test temperature change rate is typically 4 ℃/min; the testing temperature and the penetration time are 20 min; the test temperature is kept for 10 min; the duration of a single cycle was found to be 2 × 122.5min (125/4+20+ 10); the total duration of the test was then 618 × 122.5/60 — 1261.75 h.
If the number of the battery management systems to be tested is 3, the time length of each battery management system temperature alternation test is 1261.75/3-420.6 h, which is equivalent to 17.5 days in terms of days.
In order to evaluate the service life of key components of the battery management system of the new energy automobile and ensure that the key components can work reliably and stably in a specified declaration period, the accelerated aging test is carried out by introducing a temperature alternation test model based on a coffee-Manson model, a corresponding test scheme is formulated on the basis of analyzing the mathematical model, the mathematical model is analyzed, a corresponding differential test scheme is formulated by combining the typical characteristics of the battery management system, and the accelerated aging service life test is carried out on the battery management system, so that the test period is shortened, the test efficiency is improved, and the test cost is reduced.
Battery management system life test device embodiment based on temperature alternation experiment:
the device for testing the service life of the battery management system based on the temperature alternation test comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the method for testing the service life of the battery management system based on the temperature alternation test.
The specific implementation process of the battery management system life testing method based on the temperature alternation test is described in the above embodiment of the battery management system life testing method based on the temperature alternation test, and is not described herein again.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (7)
1. A battery management system service life testing method based on a temperature alternation test is characterized by comprising the following steps:
determining the highest temperature and the lowest temperature of the cycle test and the design cycle number;
calculating an acceleration factor by using a temperature alternating acceleration model according to the highest temperature and the lowest temperature; and obtaining the duration of a single cycle according to the maximum temperature and the minimum temperature;
obtaining test cycle times according to the acceleration factors and the design cycle times;
and obtaining the total test time length according to the test cycle times and the time length of the single cycle.
2. The battery management system life testing method based on the temperature alternation test as claimed in claim 1, wherein the temperature alternation acceleration model is a coffee-Manson model, and the coffee-Manson model is:
wherein A isCMIs an acceleration factor; delta TTestThe difference value of the highest temperature and the lowest temperature of the cycle test is shown; delta TFeldAverage temperature difference for working temperature within design life; c is the index of the Coffin-Manson model.
3. The battery management system life testing method based on the temperature alternation test as claimed in claim 1, wherein the duration of a single cycle is calculated by:
t＝2*(ΔTTest/v+t0+t1)；
wherein t is the duration of a single cycle; delta TTestThe difference value of the highest temperature and the lowest temperature of the cycle test is shown; v is the test temperature rate of change; t is t0Testing the temperature permeation time; t is t1The temperature hold time was tested.
4. The battery management system life testing method based on the temperature alternation test as claimed in claim 2, wherein the number of test cycles is calculated by:
wherein N isPrufThe number of test cycles; n is a radical ofTempzyklenFeldThe number of cycles is designed.
5. The battery management system life testing method based on the temperature alternation test as claimed in claim 1 or 4, wherein the design cycle number is corrected in a manner that: and screening the originally collected design life data by using the confidence coefficient.
6. The battery management system life test method based on the temperature alternation test as claimed in claim 1, wherein if the number of the battery management systems to be tested is N, the time length of the temperature alternation test of each battery management system is calculated by:
t'Pruf＝tPruf/N；
wherein, t'PrufDuration of temperature alternation test, t, for each battery management systemPrufIs the total length of the test.
7. A battery management system life testing device based on temperature alternation test, which is characterized by comprising a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the battery management system life testing method based on temperature alternation test according to any one of claims 1-6.
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| CN113884264A (en) * | 2021-11-02 | 2022-01-04 | 无锡中汇汽车电子科技有限公司 | Composite vibration and impact test method of film capacitor for electric vehicle |
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