阅读说明：本技术 电池管理单元的性能测试方法及测试装置 (Performance test method and device of battery management unit ) 是由 谢太华 彭凌峰 于 2021-11-10 设计创作，主要内容包括：本发明公开了一种电池管理单元的性能测试方法及测试装置,该方法包括：测试系统稳定性检测及判定看,使用至少两个合格BMU模块对同一电池模块的输出电压、环境温度进行检测,并将数据上传到BCU系统,BCU系统将测得的数据上传至上位机,上位机判定测试系统稳定性是否合格；待测BMU模块测试及性能判定：待测BMU模块对电池模块的输出电压、环境温度进行检测,并将测得的数据统一上传到BCU系统,BCU系统将测得的数据上传至上位机,上位机判定待测BMU模块的性能是否合格。与现有技术相比,本发明采用现有的结构便能够对待测BMU模块进行快速的检测,整体的测量准确度高,结构简单,成本很低,重复使用率高。(The invention discloses a performance test method and a test device of a battery management unit, wherein the method comprises the following steps: the test system stability detection and judgment comprises that at least two qualified BMU modules are used for detecting the output voltage and the ambient temperature of the same battery module and uploading data to a BCU system, the BCU system uploads the measured data to an upper computer, and the upper computer judges whether the test system stability is qualified or not; testing and performance judging of the BMU module to be tested: the BMU module to be tested detects the output voltage and the ambient temperature of the battery module, the measured data are uploaded to the BCU system in a unified mode, the BCU system uploads the measured data to the upper computer, and the upper computer judges whether the performance of the BMU module to be tested is qualified or not. Compared with the prior art, the BMU module to be detected can be quickly detected by adopting the existing structure, the overall measurement accuracy is high, the structure is simple, the cost is very low, and the reuse rate is high.)

1. A method for testing the performance of a battery management unit, the method comprising:

detecting and judging the stability of the test system: detecting the output voltage and the ambient temperature of the same battery module by using at least two qualified BMU modules, uniformly uploading the respective measured data to a BCU system, and uploading the measured data to an upper computer by the BCU system; the upper computer compares the output voltage values measured by all the qualified BMU modules with the environmental temperature, and when the difference value of the output voltage values measured by any two qualified BMU modules is smaller than a first preset voltage difference value and the difference value of the environmental temperature measured by any two qualified BMU modules is smaller than a first preset temperature difference value, the stability of the test system is judged to be qualified;

testing and performance judging of the BMU module to be tested: the BMU module to be tested detects the output voltage and the ambient temperature of the battery module and uploads the measured data to the BCU system in a unified manner, and the BCU system uploads the measured data to the upper computer; and the upper computer compares the output voltage values measured by the BMU module to be tested and all the qualified BMU modules with the environmental temperature, and when the difference value of the output voltage values measured between the BMU module to be tested and all the qualified BMU modules is smaller than a second preset voltage difference value and the difference value of the environmental temperature measured between the BMU module to be tested and all the qualified BMU modules is smaller than a second preset temperature difference value, the performance of the BMU module to be tested is judged to be qualified.

2. The method of claim 1, wherein the method of testing the performance of the battery management unit sequentially performs the following steps:

step S1, testing the stability of the system; step S2, judging the stability of the test system; step S3, testing the BMU module to be tested; and step S4, judging the performance of the BMU module to be tested.

3. The method of claim 1, wherein the method of testing the performance of the battery management unit sequentially performs the following steps:

step S1, acquiring the detection data of all qualified BMU modules and MCU modules to be detected on the battery modules; step S2: judging the stability of the test system, and if the test system is judged to be stable, executing the step S3; step S3: and judging the performance of the BMU module to be tested.

4. The method of claim 1, wherein testing system stability detection further comprises: and the output dry contact of the qualified BMU module is in communication connection with the input dry contact of the BCU system, and the BCU system uploads the output signal of the qualified BMU module to an upper computer.

5. The method of claim 4, wherein the method of testing system stability determination comprises: and when the difference value of the output voltage values measured by any two qualified BMU modules is smaller than a first preset voltage difference value, the difference value of the environmental temperatures measured by any two qualified BMU modules is smaller than a first preset temperature difference value, and the BCU system can receive signals of all the qualified BMU modules, judging that the stability of the test system is qualified.

6. The method of claim 5, wherein the testing the BMU module under test further comprises: and the output main contact of the BMU module to be tested is in communication connection with the input main contact of the BCU system, and the BCU system uploads the output signal of the BMU module to be tested to the upper computer.

7. The method of claim 6, wherein when the difference between the measured output voltage values of the BMU module under test and each of the qualified BMU modules is smaller than a second preset voltage difference, the difference between the measured ambient temperatures of the BMU module under test and each of the qualified BMU modules is smaller than a second preset temperature difference, and the BCU system can receive the signal of the BMU module under test, the performance of the BMU module under test is determined to be qualified.

8. The battery management unit performance testing method of claim 1, wherein the BCU system is connected to the upper computer through CAN communication.

9. The method for testing the performance of a battery management unit according to claim 1, wherein the first preset voltage difference is 3mV and the first preset temperature difference is 2 degrees celsius; the preset difference value of the second voltage is 3mV, and the preset difference value of the second temperature is 2 ℃.

10. A performance testing apparatus of a battery management unit, comprising: the system comprises a battery module, at least two qualified BMU modules, a power supply module for supplying power to the qualified BMU modules and the BMU modules to be tested, a BCU system in communication connection with the qualified BMU modules, an upper computer in communication connection with the BCU system, and a clamp for fixing the BMU modules to be tested.

Technical Field

The invention relates to the technical field of battery management, in particular to a performance test method and a performance test device for a battery management unit.

Background

The battery management unit (BMU for short) is used for collecting voltage, current and temperature information of a single battery cell, is an important hardware composition unit in a battery management system (BMS for short), is responsible for managing the single battery in a battery module, controls the opening and closing of the battery cell and a cooling fan by monitoring the temperature, the voltage and other information, and uploads the information of the single battery to the battery management system, so that the safe, reliable and stable operation of the battery module is realized, and therefore, the performance of the battery management unit is important for the safe and stable operation of the battery module.

In the prior art, the performance test of the battery management unit is generally realized by simulating the battery cell equipment, setting fixed output voltage on the simulated battery cell equipment, measuring the voltage of a simulated battery cell by using the BMU module to be tested, collecting data by using an upper computer and comparing the difference to judge whether the test is passed or not, but the simulated battery cell equipment is very expensive in manufacturing cost and high in cost and is inconvenient to operate.

Disclosure of Invention

The invention provides a performance test method and a performance test device for a battery management unit, and solves the technical problems that the performance test of the battery management unit is inconvenient and the test cost is high in the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method of testing the performance of a battery management unit, the method comprising: detecting and judging the stability of the test system: detecting the output voltage and the ambient temperature of the same battery module by using at least two qualified BMU modules, uniformly uploading the respective measured data to a BCU system, and uploading the measured data to an upper computer by the BCU system; the upper computer compares the output voltage values measured by all the qualified BMU modules with the environmental temperature, and when the difference value of the output voltage values measured by any two qualified BMU modules is smaller than a first preset voltage difference value and the difference value of the environmental temperature measured by any two qualified BMU modules is smaller than a first preset temperature difference value, the stability of the test system is judged to be qualified; testing and performance judging of the BMU module to be tested: the BMU module to be tested detects the output voltage and the ambient temperature of the battery module and uploads the measured data to the BCU system in a unified manner, and the BCU system uploads the measured data to the upper computer; and the upper computer compares the output voltage values measured by the BMU module to be tested and all the qualified BMU modules with the environmental temperature, and when the difference value of the output voltage values measured between the BMU module to be tested and all the qualified BMU modules is smaller than a second preset voltage difference value and the difference value of the environmental temperature measured between the BMU module to be tested and all the qualified BMU modules is smaller than a second preset temperature difference value, the performance of the BMU module to be tested is judged to be qualified.

Further, the performance test method of the battery management unit sequentially executes the following steps: step S1, testing the stability of the system; step S2, judging the stability of the test system; step S3, testing the BMU module to be tested; and step S4, judging the performance of the BMU module to be tested.

Further, the performance test method of the battery management unit sequentially executes the following steps: step S1, acquiring the detection data of all qualified BMU modules and MCU modules to be detected on the battery modules; step S2: judging the stability of the test system, and if the test system is judged to be stable, executing the step S3; step S3: and judging the performance of the BMU module to be tested.

Further, the test system stability detection further comprises: and the output dry contact of the qualified BMU module is in communication connection with the input dry contact of the BCU system, and the BCU system uploads the output signal of the qualified BMU module to an upper computer.

Further, the method for judging the stability of the test system comprises the following steps: and when the difference value of the output voltage values measured by any two qualified BMU modules is smaller than a first preset voltage difference value, the difference value of the environmental temperatures measured by any two qualified BMU modules is smaller than a first preset temperature difference value, and the BCU system can receive signals of all the qualified BMU modules, judging that the stability of the test system is qualified.

Further, the testing of the BMU module to be tested further comprises: and the output main contact of the BMU module to be tested is in communication connection with the input main contact of the BCU system, and the BCU system uploads the output signal of the BMU module to be tested to the upper computer.

Further, when the difference value of the output voltage values measured between the BMU module to be tested and each of the qualified BMU modules is smaller than a second preset voltage difference value, the difference value of the environmental temperatures measured between the BMU module to be tested and each of the qualified BMU modules is smaller than a second preset temperature difference value, and the BCU system can receive the signal of the BMU module to be tested, it is determined that the performance of the BMU module to be tested is qualified.

Furthermore, the BCU system is in communication connection with the upper computer through a CAN; the BCU system is in communication connection with the BMU module through the CAN.

Further, the first preset voltage difference is 3mV, and the first preset temperature difference is 2 ℃; the preset difference value of the second voltage is 3mV, and the preset difference value of the second temperature is 2 ℃.

A performance testing apparatus of a battery management unit, comprising: the system comprises a battery module, at least two qualified BMU modules, a power supply module for supplying power to the qualified BMU modules and the BMU modules to be tested, a BCU system in communication connection with the qualified BMU modules, an upper computer in communication connection with the BCU system, and a clamp for fixing the BMU modules to be tested.

Has the advantages that: compared with the prior art, the performance test method and the performance test device for the battery management unit provided by the invention have the advantages that the BMU module to be tested can be rapidly detected by adopting the existing structure, the overall measurement accuracy is high, the structure is simple, the cost is very low, the influence of the voltage change of the battery cell of the battery module is avoided, the battery module can be taken out for charging or replacing, and the reuse rate is high.

Drawings

Fig. 1 is a block diagram schematically illustrating the structure of a device for testing the performance of a battery management unit according to the present invention.

FIG. 2 is a flow chart of a performance testing method according to a first embodiment of the present invention.

FIG. 3 is a flow chart of a performance testing method in a second embodiment of the present invention.

FIG. 4 is a flowchart of a method for determining the stability of a test system according to the present invention.

Fig. 5 is a flowchart of a method for determining the performance of a BMU module to be tested according to the present invention.

Detailed Description

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides a performance test method and a performance test device of a battery management unit; as shown in fig. 1, the performance testing apparatus of the battery management unit mainly includes: the device comprises a battery module, a tested qualified BMU module, a power module, a BCU system, a clamp and an upper computer.

The power module is electrically connected with the qualified BMU module and the BMU module to be tested to supply power to each BMU module, and the power module in this embodiment adopts an AC/DC switching power module to provide 24V direct current for each BMU module (including the qualified BMU module and the BMU module to be tested).

In the embodiment, at least two qualified BMU modules are selected and used for detecting data such as power supply voltage, environmental temperature and the like of the same battery module, and output dry contacts of the qualified BMU modules are in signal connection with input dry contacts of a BCU system; the qualified BMU module can upload detected data to the BCU system, the BCU system is used for communication, commands are issued and data are collected, the BCU system collects the data and uploads the data to the upper computer, the upper computer judges the stability of the test system (a system formed by all parts for executing the detection of the BMU module to be detected and including the battery module, the wiring condition of the battery module and the BMU, the wiring condition of the BMU module and the BCU and the like) by comparing the data detected by all the BMU modules, and only after the detection of the qualified BMU module and the verification of the stable test of the whole test system, the formal test work is started.

The fixture is used for clamping the BMU module to be tested, so that the circuit connection is ensured not to be abnormal in the test process, the accuracy of the test result is ensured, the specific structure of the fixture can be any clamping structure which can be directly found by a person skilled in the art in the prior art, and the application does not make specific limitation.

Further, the present application also proposes a performance testing method of a battery management unit, as shown in fig. 2, in the first embodiment, the testing method performs the following steps:

step S1: and testing the stability of the system.

Step S2: and (4) judging the stability of the test system, if the test system is judged to be stable, executing the step S3, and if the test system is judged to be unstable, manually checking the problem and executing the step S1 again after the problem is solved.

Step S3: and testing the BMU module to be tested.

Step S4: and judging the performance of the BMU module to be tested, wherein if the BMU module to be tested passes the performance judgment, the BMU module to be tested is qualified, and if the BMU module to be tested does not pass the performance judgment, the BMU module to be tested is unqualified.

Of course, as shown in fig. 3, the testing method in the second embodiment may also perform the following steps:

step S1: and acquiring the detection data of all qualified BMU modules and MCU modules to be detected on the battery modules.

Step S2: judging the stability of the test system, if the test system is judged to be stable, executing the step S3, if the test system is judged to be unstable, manually checking the problem and executing the step S1 again after solving the problem;

step S3: and judging the performance of the BMU module to be tested, wherein if the BMU module to be tested passes the performance judgment, the BMU module to be tested is qualified, and if the BMU module to be tested does not pass the performance judgment, the BMU module to be tested is unqualified.

The first embodiment differs from the second embodiment in that: in the first embodiment, the stability detection and judgment of the test system are firstly carried out, and the test and stability judgment of the BMU module to be tested are started after the test system is determined to be stable; the second embodiment is to perform unified test, acquire data of qualified BMU modules and BMU modules to be tested, and sequentially determine whether the test system and the BMU modules to be tested are qualified or not in the upper computer. The first embodiment has the advantages that the stability of the test system can be judged firstly, the test and judgment of all BMU modules to be tested can be directly carried out after the test system is stable, the test system does not need to be judged repeatedly, and when the test system is unstable, the fault of the test system is conveniently eliminated, so that the test efficiency is improved; the second embodiment has the advantages that the data of the qualified BMU module and the BMU module to be tested can be synchronously detected, the influence of objective factors on the detection result is reduced, and the stability of the accuracy of the test is improved.

Specifically, three detection items are provided in the stability detection process of the test system, namely the output voltage, the ambient temperature and the signal transmission of the battery module; and each qualified BMU module transmits the measured output voltage and the measured ambient temperature of the same battery module to the BCU system, the BCU system collects and arranges the data and uploads the data to the upper computer, and the upper computer judges the stability of the test system.

As shown in fig. 4, the specific test system stability determination includes the following steps:

step S21: the upper computer signal output port outputs a control signal to the qualified BMU modules, if all the qualified BMU modules can receive the control signal and output a starting signal through the output dry contact, and the upper computer can receive the data of the output voltage and the environmental temperature detected by the qualified BMU modules, the step S22 is executed; otherwise, judging that the test system is unstable.

Step S22: when the difference value of the output voltage values measured by any two qualified BMU modules is smaller than the preset difference value of the first voltage, executing step S23; otherwise, judging that the test system is unstable.

Step S23: when the difference value of the environmental temperatures measured by any two qualified BMU modules is smaller than a first preset temperature difference value, judging that the test system is stable, and executing the step S3; otherwise, judging that the test system is unstable.

The test items of the BMU module to be tested are also provided with three detection items which are respectively the output voltage, the environment temperature and the signal transmission of the battery module; if the BMU module to be tested transmits the measured output voltage and the measured ambient temperature of the same battery module to the BCU system, the BCU system collects and arranges the data and uploads the data to the upper computer, and the upper computer judges the BMU module to be tested.

As shown in fig. 5, the performance determination of the BMU module to be tested specifically includes the following steps:

step S41: the upper computer signal output port outputs a control signal to the BMU module to be tested, if the BMU module to be tested can receive the control signal and output a starting signal through the output dry contact, and the upper computer can receive data of output voltage and ambient temperature detected by the BMU module to be tested, the step S42 is executed; otherwise, judging that the BMU module to be tested is unqualified.

Step S42: when the difference values of the output voltage values measured between the BMU module to be measured and each qualified BMU module are smaller than the preset second voltage difference value, executing the step S43; otherwise, judging that the BMU module to be tested is unqualified.

Step S43: when the difference values of the environmental temperatures measured between the BMU module to be measured and the qualified BMU modules are smaller than the second preset temperature difference value, judging that the BMU module to be measured is qualified in performance; otherwise, judging that the BMU module to be tested is unqualified.

Preferably, the BCU system is in communication connection with the upper computer through a CAN; the BCU is in communication connection with the BMU through the CAN.

Preferably, in one embodiment, the first voltage preset difference is 3mV, and the first temperature preset difference is 2 degrees celsius; the second voltage preset difference is 3mV, and the second temperature preset difference is 2 ℃.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.