Vehicle battery management system anti-interference test method, device, equipment, medium and product

Abstract

The invention discloses a vehicle battery management system anti-interference test method and device, electronic equipment, a medium and a product. The method comprises the steps that first noise excitation and second noise excitation used for simulation testing and a target voltage threshold value used for evaluating a simulation result are acquired; constructing a target simulation model of the target vehicle according to a preset boost system structure digital model, the first noise excitation and the second noise excitation; performing system simulation based on the target simulation model, and obtaining simulation voltages of chip pin positions corresponding to the master and slave boards of the battery management system in the target simulation model; and when the simulation voltage is greater than the target voltage threshold, determining that the battery management system of the target vehicle has a communication abnormal risk under the boost charging condition. According to the method, the problem that normal charging is affected due to abnormal communication of the battery management system caused by electromagnetic interference generated by an electric drive and a charging pile under the boost charging working condition of the electric vehicle can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle testing, in particular to a vehicle battery management system anti-interference test method and device, electronic equipment, readable storage medium and computer program product. BACKGROUND

[0002] With the popularity of electric vehicles, a large number of inventory charging piles in the market are still low-voltage direct-current piles, resulting in increasing challenges in vehicle charging compatibility. To solve this problem, the industry generally adopts a scheme of adding a boost circuit between the charging equipment and the power battery to realize normal charging by increasing the output voltage. However, the strong electromagnetic interference generated by the boost circuit during operation can seriously affect the communication stability of the battery management system. The traditional evaluation method usually only verifies the interference effect through real vehicle testing. This method has defects such as long test period, high cost, and difficulty in discovering problems in the design stage in advance, and cannot meet the needs of vehicle development efficiency and reliability. SUMMARY

[0003] In view of the above problems, the present application provides a vehicle battery management system anti-interference test method, device, electronic equipment, readable storage medium and computer program product, which can solve the problem that the electromagnetic interference generated by the electric drive and the charging pile causes the communication abnormality of the battery management system under the boost charging working condition of the electric vehicle, thereby affecting the normal charging.

[0004] In a first aspect, the present application provides a vehicle battery management system anti-interference test method, comprising: obtaining a first noise excitation, a second noise excitation for simulation testing, and a target voltage threshold for evaluating simulation results; constructing a target simulation model of a target vehicle according to a preset boost system structure model, the first noise excitation and the second noise excitation; performing system simulation based on the target simulation model to obtain a simulation voltage of a chip pin position corresponding to a master-slave board of a battery management system in the target simulation model; when the simulation voltage is greater than the target voltage threshold, determining that the battery management system of the target vehicle has a communication abnormality risk under the boost charging working condition.

[0005] In the above technical solution, the method can collect key data based on real working conditions to avoid disconnection between simulation and reality. It can also accurately reproduce the electromagnetic interference environment under the boost charging working condition by combining the boost system structure model and the real noise excitation. It can directly capture the voltage response of the core position of the BMS master-slave board to determine the key interference affecting point. Finally, it can quickly identify communication abnormality hazards, avoid long-period testing of real vehicles, and discover problems in the design stage in advance.

[0006] In some embodiments, the obtaining of the first noise excitation for simulation testing, the second noise excitation, and the target voltage threshold for evaluating the simulation result comprises: The first noise excitation for simulation testing is obtained by testing the electric drive voltage boosting condition through an electric drive voltage boosting test bench. The second noise excitation for simulation testing is obtained by charging test of a low-voltage platform vehicle on different direct-current charging piles. The target voltage threshold for evaluating the simulation result is obtained by testing the master-slave boards of the battery management system through an anti-interference test bench.

[0007] In the above technical solution, the method can obtain core parameters through scene-specific testing, accurately reproduce multiple electromagnetic interference sources under the voltage boosting and charging condition, and clearly define the voltage threshold for normal BMS communication, thereby providing real, comprehensive, and accurate basic data for subsequent simulation model construction and risk judgment, effectively avoiding parameter deviation caused by single test scene, and further improving the accuracy of anti-interference test and the degree of actual working condition.

[0008] In some embodiments, the obtaining of the first noise excitation for simulation testing by testing the electric drive voltage boosting condition through an electric drive voltage boosting test bench comprises: Noise voltage data of the high-voltage positive and negative wire harness and the voltage boosting wire harness are collected by testing the electric drive voltage boosting condition through the electric drive voltage boosting test bench. The noise voltage data is converted into first voltage data related to frequency. The first noise excitation of the high-voltage positive and negative wire harness end and the voltage boosting wire harness end in the simulation model is generated according to the first voltage data.

[0009] In the above technical solution, the method can accurately capture the real noise characteristics of the core wire harness under the electric drive voltage boosting condition, provide actual high-frequency domain noise input for the simulation model through data conversion and targeted excitation generation, and ensure the simulation restoration degree of the electromagnetic interference of the electric drive system.

[0010] In some embodiments, the obtaining of the second noise excitation for simulation testing by charging test of a low-voltage platform vehicle on different direct-current charging piles comprises: Noise current data on the fast charging wire harness is collected by charging test of the low-voltage platform vehicle on different direct-current charging piles. The noise current data is converted into current data related to frequency. The second noise excitation of the fast charging wire harness end in the simulation model is generated according to the current data.

[0011] In the technical solution, the method can cover the different interference characteristics of different direct current charging piles, accurately collect fast charging wire harness core noise data and convert it into frequency domain related input, so that the simulation model can restore the multi-element electromagnetic interference caused by the charging pile in the real charging scene, and improve the adaptability of the test to the actual application scene.

[0012] In some embodiments, the master-slave board of the battery management system is tested by the anti-interference test bench, and a target voltage threshold for evaluating the simulation result is obtained, including: The master-slave board of the battery management system is tested by the anti-interference test bench, and the pin voltage data of the master-slave board chip of the battery management system when it cannot work normally due to interference is obtained; The pin voltage data is converted into second voltage data related to frequency; The target voltage threshold of the simulation result is determined according to the second voltage data.

[0013] In the technical solution, the method can accurately lock the anti-interference critical state of the BMS master-slave board chip pin, process the pin voltage data in the frequency domain, establish a quantitative threshold standard that fits the actual working characteristics of the chip, and provide accurate and reliable judgment basis for the risk judgment of the subsequent simulation result.

[0014] In some embodiments, the boost system structure model at least includes an electric drive model, a battery pack model, and a high-voltage wire harness model. The electric drive model at least includes an electric drive shell. The battery pack model at least includes a battery pack shell, a master board, a slave board, a copper bar, and a boost filtering module. The high-voltage wire harness model at least includes a fast charging wire harness model, a high-voltage wire harness model from the electric drive to the battery pack, and a boost wire harness model.

[0015] In the technical solution, the method can accurately reproduce the electromagnetic coupling path and physical characteristics of the actual hardware by comprehensively covering the key component modules and structures of the boost system, provide a high-fidelity structure basis for the transmission simulation of noise excitation, and ensure that the simulation process can truly reflect the electromagnetic interference influence mechanism between components.

[0016] In some embodiments, the target simulation model of the target vehicle is constructed according to the preset boost system structure model, the first noise excitation, and the second noise excitation, including: An initial simulation model of the target vehicle is constructed according to the boost system structure model; The excitation of the high-voltage positive and negative wire harness end and the boost wire harness end in the initial simulation model is set as the first noise excitation, and the excitation of the fast charging wire harness end in the initial simulation model is set as the second noise excitation, so as to obtain the configured target simulation model.

[0017] In the technical solution, the method can accurately match the two types of noise excitations in the real working condition to the corresponding beam ends of the initial simulation model, accurately couple the interference source and the simulation structure, and construct a high-fidelity target simulation model that fits the actual boost charging scene.

[0018] In some embodiments, the method further comprises: When the simulation voltage is not greater than the target voltage threshold, it is determined that the battery management system of the target vehicle does not have a communication abnormality risk in the boost charging working condition.

[0019] In the technical solution, the method can identify the communication abnormality risk, determine the anti-interference qualified state of the BMS in the boost charging working condition, and provide comprehensive and bidirectional test conclusions for vehicle development.

[0020] In a second aspect, the application provides a vehicle battery management system anti-interference test device, comprising: An acquisition unit is configured to acquire a first noise excitation, a second noise excitation for simulation testing, and a target voltage threshold for evaluating simulation results; A construction unit is configured to construct a target simulation model of a target vehicle according to a preset boost system structure numerical model, the first noise excitation, and the second noise excitation; An simulation unit is configured to perform system simulation based on the target simulation model, and acquire a simulation voltage of a chip pin position corresponding to a master-slave board of a battery management system in the target simulation model; A determination unit is configured to determine that the battery management system of the target vehicle has a communication abnormality risk in the boost charging working condition when the simulation voltage is greater than the target voltage threshold.

[0021] In the technical solution, the device can collect key data based on real working conditions, avoid simulation and actual disconnection, combine the boost system structure numerical model and real noise excitation, accurately reproduce the electromagnetic interference environment in the boost charging working condition, directly capture the voltage response of the core position of the BMS master-slave board, determine the key interference influence point, quickly identify the communication abnormality risk, avoid long-period testing of the real vehicle, and find problems in the design stage in advance.

[0022] In a third aspect, the application provides an electronic device, which comprises a memory and a processor, the memory is configured to store a computer program, and the processor is configured to run the computer program to make the electronic device execute the vehicle battery management system anti-interference test method of any one of the first aspect.

[0023] In a fourth aspect, the present application provides a readable storage medium, wherein the readable storage medium stores a computer program, and the computer program, when executed by a processor, performs the vehicle battery management system anti-interference test method in any one of the first aspect.

[0024] In a fifth aspect, the present application provides a computer program product, wherein the computer program product comprises a computer program, and the computer program, when executed by a processor, performs the vehicle battery management system anti-interference test method in any one of the first aspect.

[0025] The present application has the following beneficial effects: real noise on the electric drive side can be captured through the electric drive boost working condition test bench, noise on the charging pile side can be collected by a test vehicle adapted to various types of direct current charging piles in the market, and the noise is processed and used as a simulation excitation input to ensure the accuracy of the simulation from the source. At the same time, the voltage critical value of the chip pin that cannot work due to interference can be obtained through the BMS board BCI anti-interference test bench, the simulation voltage of the corresponding pin can be collected by using the boost system simulation model, and the simulation voltage is compared with the critical value to directly determine the working state of the BMS, thereby improving the accuracy of the BMS anti-interference evaluation under the boost charging working condition. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 A flowchart of the vehicle battery management system anti-interference test method in some embodiments of the present application; Figure 2 A structural diagram of the electric drive boost working condition conducted interference test bench in some embodiments of the present application; Figure 3 A diagram in the boost system simulation model in some embodiments of the present application; Figure 4 A flowchart of the vehicle battery management system anti-interference test method in some embodiments of the present application; Figure 5 A simulation and measured voltage curve in some embodiments of the present application; Figure 6 A structural diagram of the vehicle battery management system anti-interference test device in some embodiments of the present application; Figure 7 A structural diagram of the electronic device in some embodiments of the present application. DETAILED DESCRIPTION

[0028] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of pieces" means two or more pieces (including two pieces) unless otherwise explicitly and specifically limited.

[0031] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0033] With the popularity of electric vehicles, a large number of inventory charging piles in the market are still low-voltage direct-current piles, which leads to the increasing challenge of vehicle charging compatibility. To solve this problem, the industry generally adopts the scheme of adding a boost circuit between the charging equipment and the power battery, so as to realize normal charging by increasing the output voltage. However, the strong electromagnetic interference generated by the boost circuit during operation can seriously affect the communication stability of the battery management system. The traditional evaluation method usually only verifies the interference influence through real vehicle test, which has defects such as long test period, high cost and difficulty in discovering problems in the design stage in advance, and cannot meet the needs of vehicle development efficiency and reliability.

[0034] To solve the above technical problems, the embodiments of the present application provide a vehicle battery management system anti-interference test method, which can capture real noise on the electric drive side through an electric drive boost test bench, collect noise on the charging pile side by means of a test vehicle adapted to various types of direct-current charging piles in the market, and use the noise as a simulation excitation input after processing, thereby ensuring the accuracy of the simulation from the source. At the same time, the method can also obtain the voltage critical value of the chip pin that cannot work due to interference through a BMS board BCI anti-interference test bench, collect the simulation voltage of the corresponding pin by using a boost system simulation model, and compare it with the critical value, thereby directly determining the working state of the BMS, and further improving the accuracy of the BMS anti-interference evaluation under the boost charging condition.

[0035] Based on this, the method can realize accurate evaluation of the anti-interference performance of the BMS under the boost charging condition of the electric vehicle.

[0036] As shown in Figure 1 some embodiments of the present application provide a vehicle battery management system anti-interference test method, which comprises: S101, acquiring a first noise excitation, a second noise excitation for simulation test, and a target voltage threshold for evaluating simulation results; S102, constructing a target simulation model of a target vehicle according to a preset boost system structure numerical model, the first noise excitation and the second noise excitation; S103, performing system simulation based on the target simulation model, and acquiring simulation voltage of the chip pin position corresponding to the battery management system master-slave board in the target simulation model; S104, when the simulation voltage is greater than the target voltage threshold, determining that the battery management system of the target vehicle has a communication abnormal risk under the boost charging condition.

[0037] In some embodiments, the first noise excitation refers to a noise signal from the electric drive side for simulation test.

[0038] In some embodiments, the second noise excitation refers to a noise signal from the charging pile side for simulation test.

[0039] In some embodiments, the target voltage threshold refers to a critical voltage value of the chip pin that cannot work due to interference for evaluating simulation results.

[0040] In some embodiments, the boost system structure numerical model refers to a preset boost system related structure mathematical model for constructing a simulation model.

[0041] In some embodiments, the target simulation model refers to a simulation model constructed according to the boost system structure model, the first noise excitation, and the second noise excitation, and used to simulate the boost charging condition.

[0042] In some embodiments, the simulation voltage refers to the voltage collected at the chip pin positions of the master and slave boards of the battery management system after system simulation based on the target simulation model.

[0043] For example, after the simulation is completed, the voltages at the chip pin positions of the master and slave boards in the battery pack are collected and analyzed, and are compared with the voltages at the chip pin positions obtained through bench testing of the master and slave boards of the battery pack. If the simulation value is greater than the test value, it is more likely that the communication between the master and slave boards of the vehicle under the actual boost charging condition will be abnormal, thereby affecting normal charging.

[0044] In some embodiments, the method can test key components before the physical sample vehicle is assembled, to obtain the first noise excitation, the second noise excitation, and the target voltage threshold. This stage aims to test specific components such as the electric drive system, the master and slave boards of the battery management system (BMS), and the charging-related circuits of the BMS independently, to obtain the real electromagnetic noise data generated by these components under actual harsh conditions (such as electric drive boost and direct current fast charging), and the anti-interference failure threshold of these components under strong interference.

[0045] In some embodiments, to ensure the accuracy and consistency of data transmission from component testing to vehicle simulation, the specific models and hardware versions of the key components used in the above component-level testing (for example, the electric drive system, the BMS master and slave board chips, etc.) are exactly the same as those of the components actually assembled on the subsequent vehicle simulation and the final target vehicle. This arrangement ensures that the noise excitation and failure threshold extracted from the testing can truly reflect the characteristics of the components used in the target vehicle, thereby providing highly reliable input conditions and judgment standards for the next stage of system-level simulation.

[0046] In some embodiments, after the component-level data collection is completed, the process of "constructing a target simulation model of the target vehicle according to the preset boost system structure model, the first noise excitation, and the second noise excitation" marks the beginning of the system-level and vehicle-level simulation stage. In this stage, the noise excitation obtained from the real components in the previous stage is applied to the system model constructed based on the physical structure of the vehicle (such as the wiring harness layout, the ground distribution, and the component installation position), so as to predict and evaluate the complete electromagnetic compatibility performance of the vehicle before it is put into physical manufacturing. This method realizes seamless connection from local real data to global virtual verification.

[0047] In the above embodiment, the method can collect key data based on real working conditions, avoid simulation from deviating from reality; can also combine the structure model of the boost system and the real noise excitation to accurately reproduce the electromagnetic interference environment under the boost charging working condition; can also directly capture the voltage response of the core position of the BMS master-slave board to determine the key interference affecting point; finally, it can quickly identify communication abnormality hidden dangers, avoid long-period testing of real vehicles, and find problems in the design stage in advance.

[0048] In some embodiments, acquiring the first noise excitation for simulation testing, the second noise excitation, and the target voltage threshold for evaluating the simulation result includes: Testing the electric drive boost working condition through the electric drive boost test bench to acquire the first noise excitation for simulation testing; Through the charging test of the low-voltage platform vehicle on different direct-current charging piles, the second noise excitation for simulation testing is obtained; Through the anti-interference test bench, the master-slave board of the battery management system is tested to obtain the target voltage threshold for evaluating the simulation result.

[0049] In the above embodiment, the method can obtain core parameters through scene-specific testing, accurately reproduce multiple electromagnetic interference sources under the boost charging working condition, and clearly define the voltage critical standard for normal BMS communication, providing real, comprehensive and accurate basic data for subsequent simulation model construction and risk judgment, effectively avoiding parameter deviation caused by single test scene, and further improving the accuracy of anti-interference testing and the degree of actual working condition fitting.

[0050] In some embodiments, the first noise excitation for simulation testing is acquired by testing the electric drive boost working condition through the electric drive boost test bench, including: Through the electric drive boost working condition test bench, noise voltage data of the high-voltage positive and negative wire harness and the boost wire harness are collected; Convert the noise voltage data into first voltage data related to frequency; According to the first voltage data, generate the first noise excitation of the high-voltage positive and negative wire harness end and the boost wire harness end in the simulation model.

[0051] In some embodiments, the method can build an electric drive boost working condition conducted interference test bench in an EMC darkroom.

[0052] In some embodiments, the high-voltage positive and negative wire harness and the boost wire harness in the electric drive boost working condition conducted interference test bench are connected to a line impedance stabilization network (LISN) to collect noise.

[0053] In some embodiments, the bench test uses a pure resistive load, and a negative line bundle connected to the negative end of the boost line bundle end LISN, to obtain the noise voltage of the high-voltage positive and negative line bundle and the boost line bundle end, respectively.

[0054] In some embodiments, the method can test the electric drive boost working condition by the electric drive boost test bench, obtain the noise voltage data of the high-voltage positive and negative line bundle and the boost line bundle, and specifically achieve the following: a dedicated electric drive boost working condition conducted interference test bench is built in an EMC darkroom. The high-voltage positive and negative line bundle and the boost line bundle of the test bench are respectively connected to an artificial power network (LISN) device to accurately collect the conducted noise on the line bundle. The test bench uses a pure resistive load, and a negative line bundle connected to the negative end of the boost line bundle end LISN, to complete the test loop and obtain the noise voltage of the high-voltage positive and negative line bundle end and the boost line bundle end, respectively.

[0055] In some embodiments, the method can convert the test data into frequency-dependent voltage data as the noise excitation of the high-voltage positive and negative line bundle end and the boost line bundle end in the simulation model.

[0056] In some embodiments, the test data obtained by the electric drive boost working condition test is itself frequency domain data with an amplitude of dBuV, and converting the test data into frequency-dependent voltage data is to convert the frequency domain data with an amplitude of dBuV into frequency-dependent voltage data.

[0057] Exemplary, Figure 2 A structural schematic diagram of an electric drive boost working condition conducted interference test bench is shown. Among them, LISN1 is used to collect the noise of the boost line bundle, LISN2 is used to collect the noise of the high-voltage line bundle, the load replaces the battery pack to simulate the working condition, and the electric drive is used as the test object.

[0058] In the above embodiments, the method can accurately capture the real noise characteristics of the core line bundle under the electric drive boost working condition, and provide the simulation model with actual high-frequency noise input through data conversion and targeted excitation generation, to ensure the simulation restoration degree of the electromagnetic interference of the electric drive system.

[0059] In some embodiments, the second noise excitation for simulation test is obtained by charging test of a low-voltage platform vehicle on different direct-current charging piles, including: The noise current data on the fast charging line bundle is collected by charging test of a low-voltage platform vehicle on different direct-current charging piles; The noise current data is converted into frequency-dependent current data; The second noise excitation of the fast charging line bundle end in the simulation model is generated according to the current data.

[0060] In some embodiments, the method uses a low-voltage platform vehicle (a vehicle equipped with a low-voltage power battery system, which does not require additional voltage boosting configuration and can directly adapt to low-voltage direct current piles on the market for charging) to charge at different manufacturers' direct current charging piles on the market, uses a current clamp and an oscilloscope to collect noise at the end of the fast charging wire close to the charging port, compares and analyzes the noise currents collected at different manufacturers' direct current charging piles, and then converts the maximum noise obtained by testing into frequency-dependent current data as the noise excitation at the end of the fast charging wire in the simulation model.

[0061] In some embodiments, converting the noise current data into frequency-dependent current data means processing the collected time-domain noise current signals through frequency domain analysis techniques. Specifically, multiple sets of noise currents collected at different manufacturers' direct current charging piles are compared and analyzed, the noise signal with the largest amplitude is selected and converted into current spectrum data in the frequency domain, which can clearly reflect the distribution characteristics of the noise current with frequency.

[0062] In some embodiments, generating a second noise excitation at the end of the fast charging wire in the simulation model according to the current data means taking the frequency domain current data corresponding to the maximum noise obtained in the foregoing step as the input excitation source of the fast charging wire end in the system simulation model. The second noise excitation is used to reproduce the most severe actual charging interference working condition in the simulation environment, and provides accurate data basis for the electromagnetic compatibility design and verification of the vehicle.

[0063] In the above embodiments, the method can cover the differentiated interference characteristics of different direct current charging piles, accurately collect the core noise data of the fast charging wire and convert it into frequency domain related input, so that the simulation model can restore the multi-element electromagnetic interference brought by the charging pile in the real charging scene, and improve the adaptability of the test to the actual application scene.

[0064] In some embodiments, the master and slave boards of the battery management system are tested through an immunity test bench to obtain a target voltage threshold for evaluating the simulation result, including: The master and slave boards of the battery management system are tested through an immunity test bench to obtain pin voltage data of the battery management system master and slave board chips when they cannot work normally due to interference; The pin voltage data is converted into second voltage data related to frequency; The target voltage threshold of the simulation result is determined according to the second voltage data.

[0065] In some embodiments, a dedicated PCB immunity test bench is set up in an EMC darkroom to test the main board and slave board of the battery BMS system. When the main and slave boards cannot work normally due to excessive electromagnetic interference, the voltage data of the relevant key chip pins are accurately obtained through a computer-remote-controlled oscilloscope. This setting ensures that the test personnel are away from the test environment, and effectively avoids the influence of external electromagnetic interference on the measurement results.

[0066] In some embodiments, the method can also convert the obtained time-domain voltage into frequency-dependent voltage data as a simulation judgment standard.

[0067] In some embodiments, converting the pin voltage data into frequency-dependent second voltage data means that the time-domain pin voltage signals collected by the oscilloscope are processed through frequency domain analysis technology (such as Fourier transform). This conversion process converts the time-domain voltage waveform into a frequency-domain voltage spectrum, thereby obtaining second voltage data that can reflect the frequency distribution characteristics of the interference voltage.

[0068] In some embodiments, determining the target voltage threshold of the simulation result according to the second voltage data means that the above frequency-domain voltage data is used as a judgment standard for the simulation model. Specifically, the frequency-dependent voltage spectrum obtained by conversion is set as a key threshold boundary. In simulation analysis, the simulation result is compared with this target voltage threshold, thereby objectively evaluating the simulation model accuracy and working robustness of the battery management system in the electromagnetic interference environment.

[0069] In the above embodiments, the method can accurately lock the immunity critical state of the BMS main and slave board chip pins, process the pin voltage data through frequency domain, establish a quantitative threshold standard that fits the actual working characteristics of the chip, and provide accurate and reliable judgment basis for the risk judgment of the subsequent simulation result.

[0070] In some embodiments, the boost system structure model at least includes an electric drive model, a battery pack model, and a high-voltage wire harness model. The electric drive model at least includes an electric drive shell. The battery pack model at least includes a battery pack shell, a main board, a slave board, a copper bar, and a boost filtering module. The high-voltage wire harness model at least includes a fast charging wire harness model, a high-voltage wire harness model from the electric drive to the battery pack, and a boost wire harness model.

[0071] In some embodiments, Figure 3 A schematic diagram in a boost system simulation model is shown. The diagram presents the connection relationship between the battery pack and the external wire harness (fast charging wire harness, high-voltage wire harness).

[0072] In the above embodiment, the method can accurately reproduce the electromagnetic coupling path and physical characteristics of the actual hardware by comprehensively covering the core component modules and key structures of the boost system, providing a high-fidelity structure basis for noise excitation transmission simulation, and ensuring that the simulation process can truly reflect the electromagnetic interference influence mechanism between components.

[0073] In some embodiments, according to the preset boost system structure model, the first noise excitation and the second noise excitation, a target simulation model of the target vehicle is constructed, comprising: constructing an initial simulation model of the target vehicle according to the boost system structure model; setting the excitation of the high-voltage positive and negative wire harness end and the boost wire harness end in the initial simulation model as the first noise excitation, and setting the excitation of the fast charging wire harness end in the initial simulation model as the second noise excitation, thereby obtaining the configured target simulation model.

[0074] In some embodiments, the method can simplify the electric drive model, the battery pack model and the wire harness model to establish a boost system simulation model.

[0075] In some embodiments, the method can use the noise obtained from the boost electric drive boost working condition test as the excitation of the high-voltage positive and negative wire harness end and the boost wire harness end of the simulation model, and use the maximum noise collected by the low-voltage platform vehicle under direct current pile charging as the excitation of the fast charging wire harness end of the simulation model.

[0076] In the above embodiment, the method can accurately match the two types of noise excitations under real working conditions to the corresponding wire harness end of the initial simulation model, realize precise coupling of the interference source and the simulation structure, and construct a high-fidelity target simulation model that fits the actual boost charging scene.

[0077] In some embodiments, the method further comprises: when the simulation voltage is not greater than the target voltage threshold, determining that the battery management system of the target vehicle does not have a communication abnormal risk under the boost charging working condition.

[0078] In the above embodiment, the method can identify the communication abnormal risk and determine the qualified state of the BMS under the boost charging working condition, providing comprehensive and bidirectional test conclusions for vehicle development.

[0079] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below. In some embodiments, as shown in Figure 4 The vehicle battery management system anti-interference test method comprises: S201, testing the electric drive boost working condition by the electric drive boost test bench, and collecting noise voltage data of the high-voltage positive and negative wire harness and the boost wire harness; S202, convert the noise voltage data into first voltage data related to frequency; S203, generate first noise excitation of the high-voltage positive and negative wire harness end and the boost wire harness end in the simulation model according to the first voltage data; S204, collect noise current data on the fast charging wire harness by charging test of the low-voltage platform vehicle on different direct current charging piles; S205, convert the noise current data into current data related to frequency; S206, generate second noise excitation of the fast charging wire harness end in the simulation model according to the current data; S207, test the master and slave boards of the battery management system through the immunity test bench, and obtain pin voltage data of the battery management system master and slave board chips when the interference cannot work normally; S208, convert the pin voltage data into second voltage data related to frequency; S209, determine the target voltage threshold of the simulation result according to the second voltage data; S210, construct an initial simulation model of the target vehicle according to the boost system structure model; S211, set the excitation of the high-voltage positive and negative wire harness end and the boost wire harness end in the initial simulation model as the first noise excitation, and set the excitation of the fast charging wire harness end in the initial simulation model as the second noise excitation, so as to obtain a configured target simulation model; S212, perform system simulation based on the target simulation model, and obtain simulation voltage of the chip pin position corresponding to the battery management system master and slave board in the target simulation model; S213, when the simulation voltage is greater than the target voltage threshold, it is determined that the battery management system of the target vehicle has a communication abnormal risk under the boost charging working condition; when the simulation voltage is not greater than the target voltage threshold, it is determined that the battery management system of the target vehicle does not have a communication abnormal risk under the boost charging working condition.

[0080] In some embodiments, Figure 5 A simulation and measured voltage curve is shown.

[0081] Figure 6 A structural schematic diagram of a vehicle battery management system immunity test device is shown, and it should be understood that the device corresponds to the method performed in the Figure 1 The device can perform the steps involved in the foregoing method, and the specific functions and effects of the device can be referred to the description in the foregoing, and the detailed description is appropriately omitted here to avoid repetition.

[0082] The vehicle battery management system immunity test device includes: The acquisition unit 310 is configured to acquire a first noise excitation, a second noise excitation for simulation test, and a target voltage threshold for evaluating a simulation result. The construction unit 320 is configured to construct a target simulation model of the target vehicle according to a preset boost system structure numerical model, the first noise excitation, and the second noise excitation. The simulation unit 330 is configured to perform system simulation based on the target simulation model to obtain a simulation voltage of a chip pin position corresponding to a master-slave board of the battery management system in the target simulation model. The determination unit 340 is configured to determine that the battery management system of the target vehicle has a communication abnormal risk in a boost charging working condition when the simulation voltage is greater than the target voltage threshold.

[0083] In some embodiments, the acquisition unit 310 includes: The acquisition subunit 311 is configured to test an electric drive boost working condition by an electric drive boost test bench to acquire the first noise excitation for simulation test. The test subunit 312 is configured to perform charging test on different direct current charging piles by a low-voltage platform vehicle to acquire the second noise excitation for simulation test. The test subunit 312 is further configured to test the master-slave board of the battery management system by an anti-interference test bench to acquire the target voltage threshold for evaluating the simulation result.

[0084] In some embodiments, the acquisition subunit 311 is specifically configured to collect noise voltage data of a high-voltage positive and negative wire harness and a boost wire harness by testing the electric drive boost working condition by the electric drive boost test bench; convert the noise voltage data into first voltage data related to frequency; and generate the first noise excitation of a high-voltage positive and negative wire harness end and a boost wire harness end in the simulation model according to the first voltage data.

[0085] In some embodiments, the test subunit 312 is specifically configured to collect noise current data on a fast charging wire harness by performing the charging test on different direct current charging piles by the low-voltage platform vehicle; convert the noise current data into current data related to frequency; and generate the second noise excitation of the fast charging wire harness end in the simulation model according to the current data.

[0086] In some embodiments, the test subunit 312 is specifically further configured to collect pin voltage data of the master-slave board chip of the battery management system when the battery management system cannot work normally due to interference by testing the master-slave board of the battery management system by the anti-interference test bench; convert the pin voltage data into second voltage data related to frequency; and determine the target voltage threshold of the simulation result according to the second voltage data.

[0087] In some embodiments, the boost system structure numerical model at least includes an electric drive model, a battery pack model, and a high-voltage wire harness model. The electric drive model at least includes an electric drive shell; The battery pack model at least includes a battery pack shell, a main board, a slave board, a copper bar, and a boost filtering module. The high-voltage wire harness model at least includes a fast charging wire harness model, an electric drive to battery pack high-voltage wire harness model, and a boost wire harness model.

[0088] In some embodiments, the construction unit 320 includes: A construction sub-unit 321 configured to construct an initial simulation model of the target vehicle according to the boost system structure model. A setting sub-unit 322 configured to set the excitation of the high-voltage positive and negative wire harness ends and the boost wire harness end in the initial simulation model as a first noise excitation, and set the excitation of the fast charging wire harness end in the initial simulation model as a second noise excitation, thereby obtaining a configured target simulation model.

[0089] In some embodiments, the vehicle battery management system anti-interference test device further includes: The determination unit 340 is further configured to determine that the battery management system of the target vehicle does not have a communication abnormality risk in the boost charging working condition when the simulation voltage is not greater than the target voltage threshold.

[0090] As shown in Figure 7 The present application provides an electronic device 400, which includes a processor 401 and a memory 402, the processor 401 and the memory 402 are interconnected and communicate with each other through a communication bus 403 and / or other forms of connection mechanism (not marked), the memory 402 stores a computer program executable by the processor 401, when the computing device runs, the processor 401 executes the computer program to execute the method in any of the preceding optional implementation manners.

[0091] The present application provides a computer readable storage medium, which stores a computer program, when the computer program is run by a processor, the method in any of the preceding optional implementation manners is executed.

[0092] The computer readable storage medium can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0093] The present application provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to perform the method in any of the optional implementation manners.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing the immunity of a vehicle battery management system, characterized in that, include: Obtain the first noise excitation, the second noise excitation, and the target voltage threshold for evaluating the simulation results for simulation testing; Based on the preset numerical model of the boost system structure, the first noise excitation, and the second noise excitation, a target simulation model of the target vehicle is constructed. System simulation is performed based on the target simulation model to obtain the simulation voltage at the corresponding chip pin position of the battery management system master-slave board in the target simulation model; When the simulated voltage is greater than the target voltage threshold, it is determined that the battery management system of the target vehicle has a communication anomaly risk under boost charging conditions.

2. The vehicle battery management system immunity test method according to claim 1, characterized in that, The process of obtaining the first noise excitation, the second noise excitation, and the target voltage threshold for evaluating the simulation results includes: The electric drive boost condition was tested using an electric drive boost test bench to obtain the first noise excitation for simulation testing. The charging test was conducted on a low-voltage platform vehicle at different DC charging piles to obtain a second noise excitation for simulation testing. The master and slave boards of the battery management system were tested using an immunity test bench to obtain the target voltage threshold for evaluating the simulation results.

3. The vehicle battery management system immunity test method according to claim 2, characterized in that, The step of testing the electric drive boost condition using an electric drive boost test bench to obtain the first noise excitation for simulation testing includes: The electric drive boost operation was tested using an electric drive boost test bench, and noise voltage data of the high voltage positive and negative harnesses and the boost harness were collected. The noise voltage data is converted into first voltage data that is frequency-dependent; The first noise excitation for the high-voltage positive and negative wire harness terminals and the boost wire harness terminals in the simulation model is generated based on the first voltage data.

4. The vehicle battery management system immunity test method according to claim 2, characterized in that, The process of conducting charging tests on low-voltage platform vehicles at different DC charging piles to obtain a second noise excitation for simulation testing includes: The low-voltage platform vehicle was charged at different DC charging piles to collect noise current data on the fast charging harness. The noise current data is converted into frequency-dependent current data. The second noise excitation at the fast charging harness end in the simulation model is generated based on the current data.

5. The vehicle battery management system immunity test method according to claim 2, characterized in that, The step of testing the master and slave boards of the battery management system using an immunity test bench to obtain the target voltage threshold for evaluating simulation results includes: The master and slave boards of the battery management system were tested using an immunity test bench to obtain the pin voltage data of the master and slave board chips when they could not work properly due to interference. The pin voltage data is converted into a second voltage data that is frequency-dependent. The target voltage threshold for the simulation results is determined based on the second voltage data.

6. The vehicle battery management system immunity test method according to claim 1, characterized in that, The digital model of the boost system structure includes at least an electric drive model, a battery pack model, and a high-voltage wiring harness model; The electric drive model includes at least an electric drive housing; The battery pack model includes at least a battery pack casing, a motherboard, a slave board, copper busbars, and a boost filter module; The high-voltage wiring harness model includes at least a fast-charging wiring harness model, a high-voltage wiring harness model from electric drive to battery pack, and a boost wiring harness model.

7. The vehicle battery management system immunity test method according to claim 1, characterized in that, The step of constructing a target simulation model of the target vehicle based on a preset numerical model of the boost system structure, the first noise excitation, and the second noise excitation includes: An initial simulation model of the target vehicle is constructed based on the numerical model of the booster system structure. The excitation of the high-voltage positive and negative wiring harness ends and the boost wiring harness ends in the initial simulation model is set as the first noise excitation, and the excitation of the fast charging wiring harness ends in the initial simulation model is set as the second noise excitation, thereby obtaining the configured target simulation model.

8. The vehicle battery management system immunity test method according to claim 1, characterized in that, The method further includes: When the simulated voltage is not greater than the target voltage threshold, it is determined that the battery management system of the target vehicle does not have a communication anomaly risk under boost charging conditions.

9. A vehicle battery management system anti-interference testing device, characterized in that, The vehicle battery management system immunity testing device includes: The acquisition unit is used to acquire the first noise excitation, the second noise excitation, and the target voltage threshold for evaluating the simulation results for simulation testing. The construction unit is used to construct a target simulation model of the target vehicle based on a preset boost system structural digital model, the first noise excitation, and the second noise excitation. The simulation unit is used to perform system simulation based on the target simulation model and obtain the simulation voltage at the corresponding chip pin position of the battery management system master-slave board in the target simulation model. The determining unit is used to determine that the battery management system of the target vehicle has a communication anomaly risk under boost charging conditions when the simulated voltage is greater than the target voltage threshold.

10. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the vehicle battery management system anti-interference test method according to any one of claims 1 to 8.

11. A readable storage medium, characterized in that, The readable storage medium stores a computer program, which, when executed by a processor, performs the vehicle battery management system anti-interference test method according to any one of claims 1 to 8.

12. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, performs the vehicle battery management system anti-interference test method according to any one of claims 1 to 8.

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