A test evaluation method and system for new energy vehicle battery health degree

Abstract

The application relates to the technical field of battery health and discloses a test and evaluation method and system for the health degree of a new energy automobile battery, which comprises the following steps: making a qualified judgment on the test charging requirements of a battery test environment according to automobile attributes, determining the displayed health degree and energy release amount of a to-be-tested vehicle based on vehicle battery energy testing, determining the test health degree according to the standard electric energy and the energy release amount of the to-be-tested vehicle, verifying the battery health degree accuracy of the to-be-tested vehicle according to the relationship between the displayed health degree and the test health degree, verifying the consistency of the battery health degree accuracy of the same family of vehicles according to the displayed health degree and the test health degree of a plurality of vehicles of the same family, and determining the battery health evaluation grade based on the verification result of the battery health degree accuracy of the to-be-tested vehicle and the verification result of the consistency of the battery health degree accuracy of the same family of vehicles. The application reduces the test cycle of the battery health and ensures the reliability of the battery health degree test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery health, in particular to a test and evaluation method and system for battery health of a new energy vehicle. BACKGROUND

[0002] With the popularization of new energy vehicles, users' attention to the battery health of new energy vehicles is on the rise. Battery health directly determines the vehicle's endurance and driving safety. However, the existing battery health test requires long-term real vehicle road test or bench simulation test to obtain complete performance data of the battery from a new state to scrap in order to pursue test accuracy. The complete life cycle covering battery charge and discharge cycles takes 3-5 years, which is a long test cycle, resulting in test results that are difficult to match the technical characteristics of the new generation of products. If a shorter test cycle is used, the vehicle's driving mileage is usually less than 10,000 kilometers, corresponding to only dozens to hundreds of battery charge and discharge cycles, and the battery has not been tested under sufficient environmental conditions, resulting in test battery health accuracy results that cannot reflect the whole vehicle situation.

[0003] Therefore, it is necessary to design a test and evaluation method and system for battery health of a new energy vehicle to solve the problems existing in the prior art. SUMMARY

[0004] In view of this, the present application provides a test and evaluation method and system for battery health of a new energy vehicle, aiming to solve the problem of long test cycle of battery health, test results that are difficult to match the technical characteristics of the new generation of products, and test battery health accuracy results that cannot reflect the whole vehicle situation caused by using a shorter test cycle.

[0005] In one aspect, the present application provides a test and evaluation method for battery health of a new energy vehicle, comprising:

[0006] Building a battery test environment, obtaining the vehicle attributes of a vehicle to be tested, determining the test charging requirements of the battery test environment according to the vehicle attributes, and determining the charging index of the vehicle to be tested based on the vehicle attributes;

[0007] Testing the battery of the vehicle to be tested based on the charging index and the battery test environment, and determining the display health and energy release amount of the vehicle to be tested based on the vehicle battery energy test when the cumulative driving mileage condition or the battery health condition is met, and determining the test health according to the standard electric energy of the vehicle to be tested and the energy release amount;

[0008] Verify the battery health accuracy of the to-be-tested vehicle according to the relationship between the display health and the test health, obtain several same-family vehicles of the to-be-tested vehicle, and verify the consistency of the battery health accuracy of the same family according to the display health and the test health of the several same-family vehicles;

[0009] Determine the battery health evaluation level based on the verification result of the battery health accuracy of the to-be-tested vehicle and the verification result of the consistency of the battery health accuracy of the same family.

[0010] Further, when obtaining the automobile attribute of the to-be-tested vehicle and determining whether the test charging requirement is qualified according to the automobile attribute, the method comprises:

[0011] The automobile attribute comprises a pure electric vehicle and a hybrid electric vehicle.

[0012] If the to-be-tested vehicle is a pure electric vehicle, when the to-be-tested vehicle does not meet the SRC curve, it is determined that the test charging requirement is qualified, otherwise, it is determined that the test charging requirement is unqualified.

[0013] If the to-be-tested vehicle is a hybrid electric vehicle, when the vehicle speed of the to-be-tested vehicle in the fourth to sixth running cycle segments of the SRC curve is 97km / h, and the engine stops working during the vehicle speed cruise, it is determined that the test charging requirement is unqualified, otherwise, it is determined that the test charging requirement is qualified.

[0014] Further, when determining the charging index of the to-be-tested vehicle based on the automobile attribute, the method comprises:

[0015] If the to-be-tested vehicle is a pure electric vehicle, charging is performed within 2 hours after the determination that the test charging requirement is qualified ends;

[0016] If the to-be-tested vehicle is a hybrid electric vehicle, charging is performed within 12 hours after the determination that the test charging requirement is qualified ends;

[0017] When the to-be-tested vehicle accumulates 10,000 kilometers of driving, the ratio of the total driving mileage of the charging completion to 10,000 kilometers is greater than or equal to 90%, and the accumulated driving mileage of the to-be-tested vehicle is recorded.

[0018] Further, when the accumulated driving mileage condition or the battery health condition is met, the method comprises:

[0019] The accumulated driving mileage condition is that the accumulated driving mileage of the to-be-tested vehicle reaches 50,000 kilometers.

[0020] The battery health condition is that the test display health is less than or equal to 99%, and the accumulated driving mileage of the to-be-tested vehicle is greater than or equal to 20,000 kilometers.

[0021] Further, in determining the test health degree according to the standard electric energy energy of the to-be-tested vehicle and the energy release amount, comprising:

[0022] The test health degree is determined by the following formula:

[0023] ;

[0024] Wherein, represents the test health degree, represents the energy release amount, represents the standard electric energy energy;

[0025] If the energy release amount is greater than the standard electric energy energy, the test health degree is 100%.

[0026] Further, in verifying the battery health degree accuracy of the to-be-tested vehicle according to the relationship between the display health degree and the test health degree, comprising:

[0027] If the difference between the display health degree and the test health degree is less than or equal to 5%, it is determined that the battery health degree accuracy of the to-be-tested vehicle passes the verification, and the battery health degree accuracy of the to-be-tested vehicle is determined to be excellent, otherwise, a second vehicle battery energy test is performed;

[0028] If the second vehicle battery energy test is performed, the display health degree, the energy release amount and the test health degree of the to-be-tested vehicle are re-determined, the display health degree average of the display health degree after the two tests is calculated, and the test health degree average of the test health degree after the two tests is calculated;

[0029] If the difference between the display health degree average and the test health degree average is less than or equal to 5%, it is determined that the battery health degree accuracy of the to-be-tested vehicle passes the verification, and the battery health degree accuracy of the to-be-tested vehicle is determined to be excellent, otherwise, a third vehicle battery energy test is performed;

[0030] If it is determined that the battery health degree accuracy of the to-be-tested vehicle does not pass the verification after the third vehicle battery energy test, the battery health degree accuracy of the to-be-tested vehicle is determined to be unqualified.

[0031] Further, in verifying the consistency of the battery health degree accuracy of the same family according to the display health degree and the test health degree of a plurality of vehicles of the same family, comprising:

[0032] The same family mean and the same family standard deviation are determined according to the following formula:

[0033] ;

[0034] ;

[0035] ;

[0036] in, Indicates the first Health difference between vehicles of the same series, SOCE read,i Indicates the first The health status of vehicles within the same series, Indicates the first Health status of vehicles in the same series This represents the average value of vehicles within the same product line. This indicates the standard deviation of vehicles within the same series. This represents the number of vehicles in the same series, and 3 ≤ ≤16;

[0037] The consistency of battery health accuracy within the same family is verified based on the mean and standard deviation of vehicles in the same family.

[0038] Furthermore, when verifying the consistency of battery health accuracy across the same family of vehicles based on the mean and standard deviation of the same family of vehicles, the following steps are included:

[0039] Determine the first parameter Second parameter Third parameter and the fourth parameter And determine the deviation benchmark value. It is 5;

[0040] like ≤ If the accuracy of battery health is consistent within the same family, the verification is passed.

[0041] like > If the accuracy of battery health is not consistent within the same family, it is determined that the verification has failed.

[0042] like < ≤ If so, the number of vehicles in the same series will be increased, and the consistency of battery health accuracy within the same series will be re-verified.

[0043] Furthermore, when determining the battery health evaluation level based on the pass / fail judgment result of the battery health accuracy accuracy of the test vehicle and the pass / fail judgment result of the consistency of battery health accuracy accuracy within the same family, the following steps are included:

[0044] If the battery health precision of the to-be-tested vehicle is determined to be excellent, and the battery health precision consistency of the same family is verified, the battery health evaluation level of the to-be-tested vehicle is determined to be excellent, otherwise, the battery health evaluation level of the to-be-tested vehicle is determined to be unqualified.

[0045] Compared with the prior art, the beneficial effects of the present application are that the battery test environment is built, the charging index is determined in combination with the automobile properties of the to-be-tested vehicle, the data accumulation of the whole life cycle is shortened, the test is carried out in a targeted manner, and the reliability of the new energy vehicle update is ensured. The accumulated mileage condition or the battery health condition is used as the node of the test judgment, the display health degree and the energy release amount are determined in combination with the vehicle battery energy test, the test health degree is finally calculated, the insufficient precision caused by insufficient mileage, less charging and discharging cycle times and insufficient environmental test in the short period test is avoided, the test result can truly reflect the battery health condition of the whole vehicle, the battery health precision consistency of the same family is verified, the battery performance of the individual is covered, the batch characteristics of the vehicles of the same family are taken into account, the limitation of the single test dimension is reduced, and the reliability of the test result is improved.

[0046] On the other hand, the present application also provides a test evaluation system for the battery health degree of a new energy vehicle, which is used for applying the test evaluation method for the battery health degree of a new energy vehicle, and comprises:

[0047] The test judgment module is configured to acquire the automobile properties of the to-be-tested vehicle, make a qualified determination on the test charging requirements of the battery test environment according to the automobile properties, and determine the charging index of the to-be-tested vehicle based on the automobile properties;

[0048] The test analysis module is configured to test the battery of the to-be-tested vehicle based on the charging index and the battery test environment, and when the accumulated mileage condition or the battery health condition is met, determine the display health degree and the energy release amount of the to-be-tested vehicle based on the vehicle battery energy test, and determine the test health degree according to the standard electric energy of the to-be-tested vehicle and the energy release amount.

[0049] The test processing module is configured to verify the battery health precision of the to-be-tested vehicle according to the relationship between the display health degree and the test health degree, acquire a plurality of same family vehicles of the to-be-tested vehicle of the same family, and verify the battery health precision consistency of the same family according to the display health degree and the test health degree of the plurality of same family vehicles.

[0050] The test evaluation module is configured to determine the battery health evaluation level based on the verification result of the battery health precision of the to-be-tested vehicle and the verification result of the battery health precision consistency of the same family.

[0051] It can be understood that the above-mentioned test and evaluation method for the health degree of a new energy vehicle battery has the same beneficial effects, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0053] Figure 1 A flowchart of a test and evaluation method for the health degree of a new energy vehicle battery is provided for the embodiments of the present application.

[0054] Figure 2 An SRC curve is provided for the embodiments of the present application.

[0055] Figure 3 A functional block diagram of a test and evaluation system for the health degree of a new energy vehicle battery is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0057] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0058] Referring to Figure 1 In some embodiments of the present application, the present embodiments provide a test and evaluation method for the health degree of a new energy vehicle battery, which comprises:

[0059] S100: Build a battery test environment, obtain the vehicle properties of a vehicle to be tested, make a qualified judgment on the test charging requirements of the battery test environment according to the vehicle properties, and determine the charging index of the vehicle to be tested based on the vehicle properties.

[0060] S200: test the battery of the to-be-tested vehicle based on the charging index and the battery test environment, and when the cumulative driving mileage condition or the battery health condition is met, determine the display health degree and the energy release amount of the battery of the to-be-tested vehicle based on the vehicle battery energy test, and determine the test health degree according to the standard electric energy of the to-be-tested vehicle and the energy release amount.

[0061] S300: verify the battery health degree accuracy of the to-be-tested vehicle according to the relationship between the display health degree and the test health degree, obtain a plurality of same-family vehicles of the to-be-tested vehicle, and verify the consistency of the battery health degree accuracy of the same family according to the display health degree and the test health degree of the plurality of same-family vehicles.

[0062] S400: determine the battery health evaluation level based on the verification result of the battery health degree accuracy of the to-be-tested vehicle and the verification result of the consistency of the battery health degree accuracy of the same family.

[0063] Specifically, the to-be-tested vehicle is tested on a test road or a chassis dynamometer, the operation condition of the test road or the chassis dynamometer adopts the standard road cycle of Appendix GC of GB / T 18352.6-2016, and the test temperature of the battery test environment includes high temperature, low temperature and normal temperature, wherein the high temperature is not less than 30℃, and the test is carried out in the order of low temperature, high temperature and normal temperature. The solar radiation intensity is 850±45W / m 2And the solar radiation intensity is determined based on the highest point of the roof plane, ensuring that the solar radiation intensity can cover the natural fluctuations of solar radiation in the actual environment (such as the intensity fluctuations caused by changes in cloud cover), ensuring the reliability of the test results. After the battery test environment is set up, the vehicle attributes of the vehicle to be tested are obtained. Since different vehicles to be tested have different vehicle driving methods, their battery capacity, voltage level, charging protocol and other attributes differ. Therefore, according to the obtained vehicle attributes, the test charging requirements of the battery test environment are qualified, which can ensure that the charging conditions of the test environment match the actual needs of the vehicle to be tested, preventing test data distortion due to substandard charging requirements. Based on the vehicle attributes, the charging indicators of the vehicle to be tested are determined, ensuring the compatibility of subsequent testing and battery conditions, so that the test process can match the charging scene in actual vehicle use. Based on the determined charging indicators and the completed battery test environment, the battery of the vehicle to be tested is tested to simulate the charge and discharge cycle of the vehicle to be tested in actual use, and the changes in battery performance are observed through continuous testing. And only when the cumulative mileage condition or the battery health condition is met, the display health and energy release amount of the vehicle to be tested are determined according to the vehicle battery energy test. If the cumulative mileage condition is not met, it means that the battery charge and discharge cycle is less, and its battery health performance has not fully emerged. The display health and energy release amount obtained through the vehicle battery energy test can only reflect the short-term state, and cannot reflect the health change rule of the automobile battery in the real use process, resulting in deviation of the test precision. If the battery health condition is not met, it means that the automobile battery is still in a stable stage with high health degree, and its performance fluctuation is small, so the test result is difficult to capture the dynamic change characteristics of the health degree, resulting in insufficient reliability of the health degree test evaluation. Only when either condition is met, it means that the automobile battery has experienced a certain degree of use simulation or health state change. At this time, the vehicle battery energy test can accurately capture the data representing the health level of the automobile battery.

[0064] It can be understood that the vehicle battery energy test is carried out according to GB / T 18386.1, and the energy release amount of the hybrid electric vehicle is determined according to the electric energy change amount of GB / T 18386.1-2021, and the energy release amount of the hybrid electric vehicle is determined according to GB / T 19753. The display health degree is the feedback of the vehicle itself display system to the battery health state, and the display health degree can be determined through the OBD port of the vehicle or remote transmission (OTA). The energy release amount is the actual energy released by the automobile battery, and the test health degree is determined according to the standard electric energy of the vehicle to be tested and the energy release amount. The test health degree reflects the battery health state of the automobile battery in the test process, and combines the vehicle itself display and the actual test data to ensure the reliability of the accuracy test of the automobile battery health degree. Obtain a plurality of same family vehicles of the same family of the vehicle to be tested, and verify the consistency of the battery health degree accuracy of the same family according to the display health degree and the test health degree of the same family vehicles. The same family vehicles have similarities in battery configuration, production process and the like, and the consistency verification is carried out, so as to understand the stability of the battery health degree test result of the same family vehicles, thereby troubleshooting the common problems in the test link. Based on the verification result of the battery health degree accuracy of the vehicle to be tested and the verification result of the consistency of the battery health degree accuracy of the same family, the battery health evaluation grade is determined, which not only avoids the problem that the test cycle of the battery health is long, but also ensures that the test accuracy result can reflect the whole vehicle through the consistency verification of the battery health degree accuracy of the same family.

[0065] Referring to Figure 2 As shown in the drawings, in some embodiments of the present application, when the automobile attributes of the vehicle to be tested are obtained, and the test charging requirement of the battery test environment is qualified according to the automobile attributes, the automobile attributes include pure electric vehicles and hybrid electric vehicles. If the vehicle to be tested is a pure electric vehicle, when the vehicle to be tested does not meet the SRC curve, it is determined that the test charging requirement is qualified, otherwise, it is determined that the test charging requirement is unqualified. If the vehicle to be tested is a hybrid electric vehicle, when the vehicle speed of the vehicle to be tested in the 4th to 6th running cycle section of the SRC curve is 97km / h, and the engine stops working during the vehicle speed cruise, it is determined that the test charging requirement is unqualified, otherwise, it is determined that the test charging requirement is qualified.

[0066] Specifically, the SRC curve is a speed-time standardized curve simulating real road conditions, which stipulates the speed that the vehicle should reach at each time point in the test, and is a data benchmark for evaluating the power, battery endurance and emission performance of the vehicle. Based on the SRC curve and according to the vehicle properties of the vehicle to be tested, the adaptability judgment standard is determined. For a pure electric vehicle, the vehicle battery is the only power source, and the charging characteristics directly determine the reliability of the test. If the vehicle to be tested does not meet the SRC curve, it means that the vehicle to be tested cannot reach the speed that the vehicle should reach at each time point in the test, and the energy of the vehicle battery is consumed to a certain extent. Therefore, it is determined that the test charging requirement is qualified. For a hybrid electric vehicle, the vehicle battery works cooperatively with the engine, and the fourth to sixth running cycle segments of the SRC curve focus on the medium and high speed driving stage. This stage is a high frequency scene of power mode switching (engine and vehicle battery work cooperatively or alone) of the hybrid electric vehicle, and the selected specific speed (97km / h) in this interval is because this speed is the typical speed of the hybrid electric vehicle in the medium and high speed cruising, which meets the commonly used cruising interval in the daily driving of most users. If the speed in this interval reaches 97km / h and the engine stops working, it means that the vehicle to be tested cannot consume the energy of the vehicle battery to a certain extent, and the vehicle battery only starts to output energy at high speed cruising. Therefore, it is determined that the test charging requirement is unqualified, and the test needs to be continued. Otherwise, it means that the power system mainly outputs energy from the vehicle battery, and it is determined that the test charging requirement is qualified. This avoids the data deviation caused by the unadapted test charging requirement of the vehicle to be tested, provides a data basis for subsequent tests, and thus ensures the reliability of the test data.

[0067] In some embodiments of the present application, when the charging index of the vehicle to be tested is determined based on the vehicle properties, if the vehicle to be tested is a pure electric vehicle, charging is performed within 2 hours after the test charging requirement is determined to be qualified, if the vehicle to be tested is a hybrid electric vehicle, charging is performed within 12 hours after the test charging requirement is determined to be qualified, the ratio of the total mileage of charging completed to ten thousand kilometers is greater than or equal to 90% when the vehicle to be tested accumulates ten thousand kilometers of driving, and the accumulated driving mileage of the vehicle to be tested is recorded.

[0068] Specifically, for a pure electric vehicle, the vehicle battery needs to be charged in a short time after the test charging requirement qualification determination is completed, and the power shortage of the pure electric vehicle battery will affect the test of the vehicle battery, resulting in the inability to simulate the real driving cycle. In addition, the process of frequent charging and discharging of the vehicle battery ensures the accuracy of testing the health of the vehicle battery. The hybrid electric vehicle has an engine as auxiliary power, and the load of the vehicle battery is relatively low. The requirement for charging timeliness is slightly slow, which ensures that the vehicle battery can supplement the power in time and adapts to the power characteristics of oil-electricity cooperation, so as to slowly discharge the vehicle battery during driving and avoid the interference of excessive frequent charging on test data. When charging the vehicle to be tested, the charging method adopts two forms of direct current fast charging and alternating current slow charging. In the process of accumulating mileage, the ratio of the total mileage completed by direct current fast charging to ten thousand kilometers is greater than or equal to 90%, and for old vehicles to be tested which may not be equipped with a fast charging interface, the alternating current slow charging mode is selected, and the ratio of the total mileage completed by alternating current slow charging to ten thousand kilometers is greater than or equal to 90%. The ratio of the total mileage completed by charging to the accumulated ten thousand kilometers is required to reach a high proportion, which ensures that the vehicle battery can experience sufficient charging and discharging cycles during the test process. Only when the proportion of the mileage traveled after charging is high enough, can the vehicle battery be accurately reflected in the normal charging and discharging state during the test period, rather than relying on other power (engine) for a long time or being in a low power idle state, avoiding data distortion due to insufficient charging and discharging cycles, and further ensuring the accuracy of the test.

[0069] In some embodiments of the present application, when the cumulative driving mileage condition or the battery health condition is met, the cumulative driving mileage condition is that the cumulative driving mileage of the vehicle to be tested reaches fifty thousand kilometers, and the battery health condition is that the test shows that the health degree is less than or equal to 99%, and the cumulative driving mileage of the vehicle to be tested is greater than or equal to twenty thousand kilometers.

[0070] Specifically, after testing the battery of the vehicle to be tested according to the charging index and the battery test environment, the accumulated mileage condition corresponds to the law of battery attenuation, and fifty thousand kilometers is the attenuation node determined based on a large number of battery test experiments. The battery of the vehicle at this stage has undergone sufficient charge and discharge cycles and working condition tests. At this time, the change of the battery health state can truly reflect the performance trend in long-term use, avoiding data deviation caused by insufficient test mileage. The battery health condition corresponds to the accelerated evolution of battery attenuation. The test shows that the health degree is less than or equal to 99%, that is, the health degree currently fed back by the OBD port or remote transmission (OTA) of the vehicle after testing, which indicates that the battery of the vehicle has shown an intuitive decline in health. The accumulated mileage is greater than or equal to twenty thousand kilometers, avoiding the possibility that the battery in short mileage may have temporary health fluctuations due to accidental factors (such as single extreme working condition) rather than real attenuation, ensuring that the power battery has undergone sufficient charge and discharge cycles and working condition accumulation. The test process is adjusted from the whole life cycle to the test interval of twenty thousand kilometers to fifty thousand kilometers, avoiding the problem of long test period of battery health, thereby balancing the test efficiency.

[0071] In some embodiments of the present application, when determining the test health degree according to the standard electric energy and the energy release amount of the vehicle to be tested, the test health degree is determined by the following formula:

[0072] ;

[0073] wherein, represents the test health degree, represents the energy release amount, represents the standard electric energy, and if the energy release amount is greater than the standard electric energy, the test health degree is 100%.

[0074] In some embodiments of the present application, when verifying the accuracy of the battery health degree of the vehicle to be tested according to the relationship between the display health degree and the test health degree, if the difference between the display health degree and the test health degree is less than or equal to 5%, it is determined that the accuracy of the battery health degree of the vehicle to be tested is verified, and the accuracy of the battery health degree of the vehicle to be tested is determined to be excellent, otherwise, a second vehicle battery energy test is performed, if the second vehicle battery energy test is performed, the display health degree, the energy release amount and the test health degree of the vehicle to be tested are re-determined, the average of the display health degrees after the two tests is calculated, and the average of the test health degrees after the two tests is calculated, if the difference between the average of the display health degrees and the average of the test health degrees is less than or equal to 5%, it is determined that the accuracy of the battery health degree of the vehicle to be tested is verified, and the accuracy of the battery health degree of the vehicle to be tested is determined to be excellent, otherwise, a third vehicle battery energy test is performed, if it is determined that the accuracy of the battery health degree of the vehicle to be tested is not verified after the third vehicle battery energy test, the accuracy of the battery health degree of the vehicle to be tested is determined to be unqualified.

[0075] Specifically, the test health degree reflects the battery health state of the vehicle battery during the test, and the standard electric energy can be determined by the use instruction or experiment of the vehicle battery manufacturer. In general, the vehicle battery may have a certain storage redundancy, so that the energy stored in the vehicle battery is greater than the nominal standard electric energy, so that the energy release amount is greater than the standard electric energy, and therefore the test health degree is determined to be 100%. By comparing the difference between the display health degree and the test health degree, if the difference is less than or equal to 5%, it indicates that the feedback of the vehicle display system to the battery health and the actual test result are within the allowable deviation range, and the accuracy of the battery health degree of the vehicle to be tested is determined to be excellent. If the difference exceeds 5%, it indicates that the feedback of the vehicle display system to the battery health and the actual test result exceed the allowable deviation range, a second vehicle battery energy test is performed, and the average of the test health degrees after the two tests is calculated, if the difference between the average of the display health degrees and the average of the test health degrees still exceeds 5%, a third vehicle battery energy test is performed, otherwise, it is indicated that the feedback of the vehicle display system to the battery health after the second vehicle battery energy test and the actual test result are within the allowable deviation range, and the accuracy of the battery health degree of the vehicle to be tested is determined to be excellent. If the difference between the average of the display health degrees and the average of the test health degrees still exceeds 5% after the third vehicle battery energy test, it indicates that the data deviation is not caused by single test, but the vehicle display system has a certain deviation, therefore, the accuracy of the battery health degree of the vehicle to be tested is determined to be unqualified, otherwise, the accuracy of the battery health degree of the vehicle to be tested is determined to be excellent. Through multiple vehicle battery energy tests, the accidental error of single test is reduced, thereby ensuring the reliability of the test of the battery health degree.

[0076] In some embodiments of this application, when verifying the consistency of battery health accuracy of the same family based on the displayed health and tested health of several vehicles of the same family, the method includes: determining the mean value and standard deviation of vehicles of the same family according to the following formulas.

[0077] ;

[0078] ;

[0079] ;

[0080] in, Indicates the first Health difference between vehicles of the same series, SOCE read,i Indicates the first The health status of vehicles within the same series, Indicates the first Health status of vehicles in the same series This represents the average value of vehicles within the same product line. This indicates the standard deviation of vehicles within the same series. This represents the number of vehicles in the same series, and 3 ≤ ≤16, based on the mean and standard deviation of vehicles in the same series, the consistency of battery health accuracy is verified.

[0081] In some embodiments of this application, when verifying the consistency of battery health accuracy within the same family based on the mean and standard deviation of vehicles within the same family, the method includes: determining a first parameter. Second parameter Third parameter and the fourth parameter And determine the deviation benchmark value. It is 5. If ≤ If the battery health accuracy consistency within the same family is verified, then the verification is passed. > If so, the consistency of battery health accuracy within the same family is deemed to have failed verification. < ≤ If so, the number of vehicles in the same series will be increased, and the consistency of battery health accuracy within the same series will be re-verified.

[0082] Specifically, the health difference This reflects the accuracy deviation of a single vehicle of the same series. This reflects the overall deviation of the family of vehicles. The standard deviation *s* of vehicles within the same family reflects the dispersion of accuracy differences among vehicles in the family. (First parameter) Second parameter , the third parameter and the fourth parameter The values of the parameters are shown in Table 1, which reflects the t-distribution quantiles of the same family vehicles. After testing at least 3 same family vehicles, the mean and the standard deviation of the same family vehicles are considered comprehensively, the deviation during the whole testing process is considered, and the feedback of the vehicle display system on the battery health and the actual test results are within the allowable deviation range (the difference is less than or equal to 5%), and the deviation reference value A is set to 5. If ≤ , it indicates that the overall deviation of the same family is small and the dispersion degree is low, and the consistency of the battery health precision of the same family is verified. If > , it indicates that the overall deviation is large and the dispersion degree is high, and the consistency of the battery health precision of the same family is not verified. If it is in the middle interval, the number of same family vehicles is increased for verification, so as to avoid the judgment deviation caused by insufficient sample size and ensure the accuracy of the judgment under different sample sizes.

[0083] Table 1: t-distribution quantiles of same family vehicle samples

[0084]

[0085] In some embodiments of the present application, when determining the battery health evaluation level based on the qualified determination result of the battery health precision of the vehicle to be tested and the qualified determination result of the consistency of the battery health precision of the same family, it includes: if the battery health precision of the vehicle to be tested is determined to be excellent, and the consistency of the battery health precision of the same family is verified, the battery health evaluation level of the vehicle to be tested is determined to be excellent, otherwise, the battery health evaluation level of the vehicle to be tested is determined to be unqualified.

[0086] Specifically, the battery health precision of the vehicle to be tested is excellent, which indicates that the matching degree of the display health and the test health is high, and the vehicle display system can truly reflect the actual health status of the battery. The consistency of the battery health precision of the same family is verified, which indicates that the same family vehicles in the same family can also truly reflect the actual health status of the battery, and there is no individual difference. Therefore, the battery health evaluation level of the vehicle to be tested is determined to be excellent, which not only guarantees the reliability of the battery health evaluation of the vehicle to be tested, but also reflects the group stability of the same family vehicles in the health precision. If any condition is not met, either the vehicle to be tested cannot truly reflect the actual health status of the battery, or the fluctuation of the health precision of the vehicles in the family is large, then the battery health evaluation level of the vehicle to be tested is determined to be unqualified, which not only avoids the problem of long battery health testing period, but also ensures that the test precision result can reflect the whole vehicle condition through the verification of the consistency of the battery health precision of the same family.

[0087] In the above embodiment, the charging index is determined by building a battery test environment and combining the vehicle attributes of the vehicle to be tested, the data accumulation of the whole life cycle is shortened, the test is carried out targetedly, and the reliability of the new energy vehicle update is ensured. According to the accumulated mileage condition or the battery health condition as the test judgment node, and combining the vehicle battery energy test to determine the display health degree and the energy release amount, the test health degree is finally calculated, which avoids the insufficient precision caused by insufficient mileage, less charge and discharge cycle times and insufficient environmental test in short period test, ensures that the test result can truly reflect the battery health condition of the whole vehicle, verifies the consistency of the battery health degree precision of the same family according to the same family, covers the battery performance of the individual, and takes into account the batch characteristics of the same family vehicles, reduces the limitation of single test dimension, and improves the reliability of the test result.

[0088] Referring to Figure 3 The embodiment provides a test and evaluation system for new energy vehicle battery health degree, which is used for applying the test and evaluation method for new energy vehicle battery health degree, and comprises:

[0089] The test judgment module is configured to obtain the vehicle attributes of the vehicle to be tested, make a qualified judgment on the test charging requirements of the battery test environment according to the vehicle attributes, and determine the charging index of the vehicle to be tested based on the vehicle attributes.

[0090] The test analysis module is configured to test the battery of the vehicle to be tested based on the charging index and the battery test environment, and when the accumulated mileage condition or the battery health condition is met, determine the display health degree and the energy release amount of the vehicle to be tested based on the vehicle battery energy test, and determine the test health degree according to the standard electric energy and the energy release amount of the vehicle to be tested.

[0091] The test processing module is configured to verify the battery health degree precision of the vehicle to be tested according to the relationship between the display health degree and the test health degree, obtain a plurality of same family vehicles of the same family of the vehicle to be tested, and verify the consistency of the battery health degree precision of the same family according to the display health degree and the test health degree of the plurality of same family vehicles.

[0092] The test evaluation module is configured to determine the battery health evaluation level based on the verification result of the battery health degree precision of the vehicle to be tested and the verification result of the consistency of the battery health degree precision of the same family.

[0093] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions specified in the flowchart block or blocks. Figure 1 The flowchart and / or block diagram in the variations disclosed herein illustrate the architecture, functionality, and operation of possible implementations of apparatuses and computer program products according to various embodiments. In this regard, each flowchart block and / or block in the flowcharts and / or block diagrams can represent a module, segment, or portion of code, which comprises one or more executable Figure 1 The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions specified in the flowchart block or blocks.

[0094] Finally, it should be noted that the above-mentioned embodiments are merely intended for describing the technical solutions of the present application, but not for limiting thereof. Although the present application is described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or replacement without departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.

Claims

1. A method for testing and evaluating the health of batteries in new energy vehicles, characterized in that, include: Set up a battery testing environment, obtain the vehicle attributes of the vehicle under test, determine the pass / fail status of the battery testing environment charging requirements based on the vehicle attributes, and determine the charging index of the vehicle under test based on the vehicle attributes. The battery of the vehicle under test is tested based on the charging index and the battery test environment. When the cumulative driving mileage condition or battery health condition is met, the displayed health and energy release of the vehicle under test are determined based on the vehicle battery energy test. The test health is determined according to the standard electrical energy of the vehicle under test and the energy release. The accuracy of the battery health of the vehicle under test is verified based on the relationship between the displayed health and the tested health. Several vehicles of the same series as the vehicle under test are obtained, and the consistency of the battery health accuracy of the same series is verified based on the displayed health and tested health of the several vehicles of the same series. The battery health evaluation level is determined based on the verification results of the accuracy of the battery health of the test vehicle and the verification results of the consistency of the accuracy of the battery health of the same family.

2. The method for testing and evaluating the health of new energy vehicle batteries according to claim 1, characterized in that, When acquiring the vehicle attributes of the vehicle under test and determining the pass / fail status of the battery charging requirements for the test environment based on the vehicle attributes, the process includes: The vehicle attributes include pure electric vehicles and hybrid electric vehicles; If the vehicle under test is a pure electric vehicle, and the vehicle under test does not meet the SRC curve, then the test charging requirement is deemed to be qualified; otherwise, the test charging requirement is deemed to be unqualified. If the vehicle under test is a hybrid electric vehicle, and the vehicle speed is 97 km / h in the 4th to 6th operating cycle of the SRC curve, and the engine stops working during the cruising speed, then the test charging requirement is deemed unqualified; otherwise, the test charging requirement is deemed qualified.

3. The method for testing and evaluating the health of new energy vehicle batteries according to claim 2, characterized in that, When determining the charging performance indicators of the vehicle under test based on the vehicle attributes, the following steps are included: If the vehicle to be tested is a pure electric vehicle, charging shall be carried out within 2 hours after the test charging requirements are deemed to be qualified. If the vehicle to be tested is a hybrid electric vehicle, charging shall be carried out within 12 hours after the test charging requirements are deemed to be qualified. When the test vehicle has accumulated 10,000 kilometers of driving, the ratio of the total driving mileage after charging to 10,000 kilometers is greater than or equal to 90%, and the accumulated driving mileage of the test vehicle is recorded.

4. The method for testing and evaluating the health of new energy vehicle batteries according to claim 3, characterized in that, When the cumulative driving mileage conditions or battery health conditions are met, including: The cumulative mileage condition is that the cumulative mileage of the test vehicle reaches 50,000 kilometers; The battery health conditions are defined as follows: the test shows a health level of less than or equal to 99%, and the cumulative mileage of the test vehicle is greater than or equal to 20,000 kilometers.

5. The method for testing and evaluating the health of new energy vehicle batteries according to claim 4, characterized in that, When determining the test health status based on the standard electrical energy of the vehicle under test and the energy release amount, the following are included: The health status test is determined using the following formula: ； in, This indicates a test of health status. Indicates the amount of energy released. Indicates standard electrical energy; If the energy release exceeds the standard electrical energy, the test health level is 100%.

6. The method for testing and evaluating the health of new energy vehicle batteries according to claim 5, characterized in that, When verifying the accuracy of the battery health of the vehicle under test based on the relationship between the displayed health level and the tested health level, the following steps are included: If the difference between the displayed health level and the tested health level is less than or equal to 5%, the battery health level accuracy of the vehicle under test is determined to pass the verification and the battery health level accuracy of the vehicle under test is determined to be excellent; otherwise, a second vehicle battery energy test is conducted. If a second vehicle battery energy test is conducted, the display health, energy release, and test health of the vehicle under test are redefined. The average display health after the two tests is calculated, and the average test health after the two tests is also calculated. If the difference between the displayed average health value and the tested average health value is less than or equal to 5%, the battery health accuracy of the vehicle under test is determined to pass the verification and the battery health accuracy of the vehicle under test is determined to be excellent; otherwise, a third vehicle battery energy test is conducted. If the battery health accuracy of the vehicle under test fails the verification after the third vehicle battery energy test, the battery health accuracy of the vehicle under test will be determined as unqualified.

7. The method for testing and evaluating the health of new energy vehicle batteries according to claim 6, characterized in that, When verifying the consistency of battery health accuracy across the same battery family based on the displayed and tested health scores of several vehicles from the same family, the following is included: Determine the mean and standard deviation of vehicles in the same series using the following formulas; ； ； ； in, Indicates the first Health difference between vehicles of the same series, SOCE read,i Indicates the first The health status of vehicles within the same series, Indicates the first Health status of vehicles in the same series This represents the average value of vehicles within the same product line. This indicates the standard deviation of vehicles within the same series. This represents the number of vehicles in the same series, and 3 ≤ ≤16; The consistency of battery health accuracy within the same family is verified based on the mean and standard deviation of vehicles in the same family.

8. The method for testing and evaluating the health of new energy vehicle batteries according to claim 7, characterized in that, When verifying the consistency of battery health accuracy within the same family of vehicles based on the mean and standard deviation of the same family of vehicles, the following is included: Determine the first parameter Second parameter Third parameter and the fourth parameter And determine the deviation benchmark value. It is 5; like ≤ If the accuracy of battery health is consistent within the same family, the verification is passed. like > If the accuracy of battery health is not consistent within the same family, it is determined that the verification has failed. like < ≤ If so, the number of vehicles in the same series will be increased, and the consistency of battery health accuracy within the same series will be re-verified.

9. The method for testing and evaluating the health of new energy vehicle batteries according to claim 8, characterized in that, When determining the battery health evaluation level based on the pass / fail judgment result of the battery health accuracy accuracy of the test vehicle and the pass / fail judgment result of the consistency of battery health accuracy accuracy within the same family, the following is included: If the battery health accuracy of the vehicle under test is determined to be excellent, and the consistency of battery health accuracy within the same family is verified, then the battery health evaluation level of the vehicle under test is determined to be excellent; otherwise, the battery health evaluation level of the vehicle under test is determined to be unqualified.

10. A testing and evaluation system for the health of new energy vehicle batteries, used to apply the testing and evaluation method for the health of new energy vehicle batteries as described in any one of claims 1-9, characterized in that, include: The test judgment module is configured to acquire the vehicle attributes of the vehicle under test, determine the pass / fail status of the test charging requirements of the battery test environment based on the vehicle attributes, and determine the charging index of the vehicle under test based on the vehicle attributes. The test analysis module is configured to test the battery of the vehicle under test based on the charging index and the battery test environment, and when the cumulative driving mileage condition or battery health condition is met, determine the displayed health and energy release of the vehicle under test based on the vehicle battery energy test, and determine the test health based on the standard electrical energy of the vehicle under test and the energy release. The test processing module is configured to verify the accuracy of the battery health of the vehicle under test based on the relationship between the displayed health and the test health, obtain several vehicles of the same series as the vehicle under test, and verify the consistency of the battery health accuracy of the same series based on the displayed health and test health of the several vehicles of the same series. The test evaluation module is configured to determine the battery health evaluation level based on the verification results of the accuracy of the battery health of the vehicle under test and the verification results of the consistency of the accuracy of the battery health of the same family of batteries.

Images