Method for testing protection function of battery management system

Abstract

The invention belongs to the technical field of battery testing, and discloses a method for testing the protection function of a battery management system, which comprises the following steps: an upper computer sends a function test instruction to a control module, and the control module sends a battery information acquisition instruction to an acquisition module according to the test instruction; the acquisition module acquires battery information and sends the battery information to the upper computer; adjusting a battery state alarm threshold value in the upper computer to be smaller than a numerical value in a normal battery state according to the battery information, and detecting various protection functions of the battery management system; judging whether the battery management system sends out alarm information or not; a battery state alarm threshold value in the upper computer is modified to a normal threshold value, and a protection function test of the battery management system is completed; the method provided by the invention is simple and easy to operate and saves energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery testing, and specifically refers to a testing method for the protection function of a battery management system. Background Art

[0002] In the field of batteries, a battery management system (BMS) is a control system that protects the safe use of a battery pack and provides assurance for the safe use of the battery pack. Due to the importance of the battery management system, it is necessary to test the development of the battery management system to ensure that the battery management system meets the relevant functional requirements.

[0003] With the rapid development of new energy vehicles, the requirements for lithium battery new energy battery packs are getting higher and higher, and correspondingly, the requirements for the protection functions of the BMS are also getting higher and higher, and the BMS protection functions are also increasing. In the prior art, the testing of the BMS protection functions of new energy batteries will be carried out according to different battery manufacturers and different usage scenarios, and according to the battery specification parameters provided by the battery manufacturers, by continuously adjusting the voltage, current and temperature of the battery, to test the corresponding protection functions of the BMS. And for each test, it is necessary to increase the voltage or current of the battery, and the electrical energy is directly consumed without being utilized during the test process. Therefore, the BMS protection function test in the prior art not only has a large number of steps, but also wastes electrical energy. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a testing method for the protection function of a battery management system, which can complete the protection function test of the battery management system without changing any battery environment and minimizing energy waste.

[0005] The present invention provides a testing method for the protection function of a battery management system, including: The host computer sends a function test instruction to the control module, and the control module sends a battery information acquisition instruction to the acquisition module according to the test instruction; The acquisition module acquires battery information and sends it to the host computer; According to the battery information, the battery state alarm threshold in the host computer is adjusted to a value less than that in the normal battery state, and the battery temperature too high protection function, battery temperature too low protection function, battery current too high protection function, battery current too low protection function, battery single voltage too high protection function, battery single voltage too low protection function, battery total voltage too high protection function and battery total voltage too low protection function of the battery management system are detected; Determine whether the battery management system issues an alarm message; if the battery management system issues an alarm message, the protection function of the battery management system is normal; if the battery management system does not issue an alarm message, the protection function of the battery management system fails; Modify the battery status alarm threshold in the upper computer to the normal threshold to complete the protection function test of the battery management system.

[0006] Further, the battery information includes: battery temperature information, battery current information, battery single voltage information, and battery total voltage information.

[0007] Further, the steps for detecting the over-temperature protection function of the battery management system of the battery include: Obtain the battery temperature of the battery in the current normal state; Modify the over-temperature protection alarm threshold of the battery on the upper computer so that it is lower than the current battery temperature; The battery management system performs over-temperature protection detection of the battery.

[0008] Further, the steps for detecting the under-temperature protection function of the battery management system of the battery include: Obtain the battery temperature of the battery in the current normal state; Modify the under-temperature protection alarm threshold of the battery on the upper computer so that it is higher than the current battery temperature; The battery management system performs under-temperature protection detection of the battery.

[0009] Further, the steps for detecting the over-current protection function of the battery management system of the battery include: Obtain the current value of the battery in the current normal state; Modify the over-current protection alarm threshold of the battery on the upper computer so that it is lower than the current battery current value; The battery management system performs over-current protection detection of the battery.

[0010] Further, the steps for detecting the under-current protection function of the battery management system of the battery include: Obtain the current value of the battery in the current normal state; Modify the under-current protection alarm threshold of the battery on the upper computer so that it is higher than the current battery current value; The battery management system performs under-current protection detection of the battery.

[0011] Further, the steps for detecting the over-high single voltage protection function of the battery management system of the battery include: Obtain the voltage value of the single voltage of the battery in the current normal state; Modify the over - voltage protection alarm threshold of the single - cell battery on the host computer so that it is lower than the voltage value of the current single - cell battery. The battery management system performs over - voltage protection detection on the single - cell battery.

[0012] Furthermore, the steps for detecting the under - voltage protection function of the battery management system of the battery include: Obtain the voltage value of the single - cell battery under the current normal state. Modify the under - voltage protection alarm threshold of the single - cell battery on the host computer so that it is higher than the voltage value of the current single - cell battery. The battery management system performs under - voltage protection detection on the single - cell battery. Furthermore, the steps for detecting the over - voltage protection function of the total voltage of the battery management system of the battery include: Obtain the voltage value of the total voltage of the battery under the current normal state. Modify the over - voltage protection alarm threshold of the total voltage of the battery on the host computer so that it is lower than the voltage value of the current total voltage of the battery. The battery management system performs over - voltage protection detection on the total voltage of the battery. Furthermore, the steps for detecting the under - voltage protection function of the total voltage of the battery management system of the battery include: Obtain the voltage value of the total voltage of the battery under the current normal state. Modify the under - voltage protection alarm threshold of the total voltage of the battery on the host computer so that it is higher than the voltage value of the current total voltage of the battery. The battery management system performs under - voltage protection detection on the total voltage of the battery.

[0013] The beneficial effects of the present invention are as follows: A test method for the protection function of a battery management system provided in this application does not require the battery under test to actually reach the test conditions when performing a functional protection test on the battery management system. First, the host computer controls the acquisition module to detect the state of the battery under test, and then the BMS host computer modifies the corresponding parameters to directly trigger the BMS protection item to be tested. This avoids the problem of the battery actually triggering an alarm. In a low - temperature or high - temperature environment, an environmental chamber is required to achieve the true low - temperature or high - temperature environment. For high voltage or low voltage, the battery needs to be charged and discharged to trigger, resulting in a large amount of energy waste. The method provided in this application is simple and easy to operate and saves energy. Brief Description of the Drawings

[0014] The following, in conjunction with the drawings, through a detailed description of the specific embodiments of the present application, will make the technical solutions and other beneficial effects of the present application obvious.

[0015] Figure 1 It is a schematic flow chart of the test method for the protection function of the battery management system provided in this embodiment. Detailed Embodiments

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0017] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0018] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0019] Figure 1 It is a schematic flow chart of the test method for the protection function of the battery management system provided in this embodiment.

[0020] This embodiment provides a test method for the protection function of a battery management system. The test method for the protection function of the battery management system is applied to a test system for the protection function of the battery management system. The test system for the protection function of the battery management system includes a host computer, a control module, and a collection module. The host computer is connected to the control module, and the host computer is used to control and determine whether the protection function of the battery management system fails. The control module is connected to the collection module, and the control module is used to control the collection module to collect battery status information. The collection module includes a battery temperature collection unit, a battery current collection unit, a battery single voltage collection unit, and a battery total power supply collection unit.

[0021] As Figure 1 shown, the test method for the protection function of the battery management system includes the following steps: Step S1: The host computer sends a function test instruction to the control module, and the control module sends a battery information collection instruction to the collection module according to the test instruction; In this embodiment, the test system for the protection function of the battery management system includes a host computer, a control module, a collection module, and a battery management system. The control module is respectively connected to the host computer and the collection module. After the user inputs or triggers the input of the function test instruction in other ways, the control module will determine the battery equalization control instruction according to the function test instruction and send the battery equalization control instruction to the battery management system. The battery management system adjusts the battery to be tested, and then makes the entire battery to be tested in a balanced state of voltage, current, and temperature through the battery equalization control instruction. Among them, the function test instruction refers to the input instruction to be tested, such as the battery over-temperature protection function test instruction, the battery under-temperature protection function test instruction, the battery over-current protection function test instruction, etc. The equalization control instruction refers to the instruction to control the battery to be tested in a balanced state. For example, if the battery to be tested is in an unbalanced state, the current state of the battery to be tested will be determined, and then the battery to be tested will be adjusted according to the battery state to make it in a balanced state. The balanced state can include the current balance state, the voltage balance state, and the temperature balance state, etc. The battery to be tested refers to the battery pack or other battery packs to be tested. On the one hand, making the entire battery to be tested in a balanced state and then conducting the test can ensure the accuracy of the test of the battery to be tested, because when the battery is actually used, it will consider ensuring a balanced state and then work. Therefore, the test can be more in line with the actual situation, ensuring the accuracy rate of the test. It can also test the entire battery to be tested simultaneously, thereby ensuring the test efficiency.

[0022] Step S2: The collection module collects battery information and sends it to the host computer; In this embodiment, after the battery management system determines the equalization control instruction, it will control the entire battery under test to be in an equalized state based on the equalization control instruction, and then trigger a detection instruction for the battery under test in the equalized state, that is, the parameters of the battery under test at this time when it is in the equalized state. The acquisition module performs acquisition processing according to the acquisition instruction. The acquisition instruction refers to the instruction to trigger the start of detection. Finally, the function test instruction and the acquisition instruction are sent to the acquisition module, so that the acquisition module triggers the step of starting acquisition according to the acquisition instruction, and then acquires corresponding data according to the acquisition requirements in the function test instruction. By judging the equalized state and then performing acquisition, the accuracy of acquisition can be guaranteed.

[0023] Step S3: According to the battery information, adjust the battery status alarm threshold in the upper computer to a value less than that in the normal battery state, and detect the battery temperature over - protection function, battery temperature under - protection function, battery current over - protection function, battery current under - protection function, battery single - voltage over - protection function, battery single - voltage under - protection function, battery total - voltage over - protection function, and battery total - voltage under - protection function of the battery management system; In this embodiment, when the acquisition module receives the acquisition instruction and the function test instruction, it will start instruction acquisition according to the acquisition instruction and the function test instruction, and acquire battery information according to the data required in the function test instruction. Specifically, in this embodiment, the battery information includes: battery temperature information, battery current information, battery single - voltage information, and battery total - voltage information. After the acquisition of each acquisition instruction and function test instruction is completed, the acquired data is finally transmitted to the upper computer, and the upper computer judges whether the protection function of the battery management system fails.

[0024] Modify the alarm threshold for detecting the relevant protection functions of the battery management system in the upper computer with the battery information of the battery collected by the acquisition module in the normal state, so that the data of the battery in the current normal state exceeds the modified alarm threshold.

[0025] Step S4: Judge whether the battery management system issues an alarm message; if the battery management system issues an alarm message, the protection function of the battery management system is normal; if the battery management system does not issue an alarm message, the protection function of the battery management system fails; In this embodiment, by modifying the alarm threshold for detecting the relevant protection functions of the battery management system, the data of the battery in the current normal state exceeds the modified alarm threshold, and then judge whether the battery management system issues an alarm message under this condition to judge whether the corresponding protection function fails.

[0026] Step S5: Modify the battery status alarm threshold in the upper computer to the normal threshold to complete the protection function test of the battery management system.

[0027] In this embodiment, after determining whether the protection function of the battery management system fails by modifying the alarm threshold detected by the relevant protection function of the battery management system, the battery status alarm threshold is set to the normal threshold to protect the battery.

[0028] A test method for the protection function of a battery management system provided in this embodiment does not require the battery under test to actually reach the test conditions during the functional protection test of the battery management system. First, the acquisition module is controlled by the upper computer to detect the status of the battery under test, and then the corresponding parameters are modified by the BMS upper computer to directly trigger the BMS protection item to be tested. The protection function test of the battery management system is completed without changing any battery environment and minimizing energy waste.

[0029] Further, in one embodiment, the steps for detecting the over-temperature protection function of the battery management system of the battery include: Obtain the battery temperature of the battery under the current normal state; Modify the over-temperature protection alarm threshold on the upper computer so that it is lower than the current battery temperature; The battery management system performs over-temperature protection detection of the battery.

[0030] In this embodiment, first, the battery temperature of the battery under test in the current state under the normal state is obtained. When measuring the over-temperature protection function of the battery management system of the battery, the over-temperature protection alarm threshold is modified to be lower than the battery temperature in the current state. If the over-temperature protection function of the battery management system of the battery is normal, an alarm message indicating that the battery temperature is too high will be issued; if the over-temperature protection function of the battery management system of the battery fails, an alarm message indicating that the battery temperature is too high will not be issued. Thus, it can be determined whether the over-temperature protection function is effective when the over-temperature protection alarm threshold of the battery management system of the battery is modified to normal.

[0031] Further, in one embodiment, the steps for detecting the under-temperature protection function of the battery management system of the battery include: Obtain the battery temperature of the battery under the current normal state; Modify the under-temperature protection alarm threshold on the upper computer so that it is higher than the current battery temperature; The battery management system performs under-temperature protection detection of the battery.

[0032] In this embodiment, first, obtain the battery temperature of the battery to be measured in the current state under normal conditions. When measuring the low battery temperature protection function of the battery management system, modify the low battery temperature protection alarm threshold to be higher than the battery temperature in the current state. If the low battery temperature protection function of the battery management system is normal, an alarm message indicating low battery temperature will be issued; if the low battery temperature protection function of the battery management system fails, no alarm message indicating low battery temperature will be issued. Thus, it can be determined whether the low battery temperature protection function of the battery management system is effective when the low battery temperature protection alarm threshold is modified to normal.

[0033] Further, in one embodiment, the steps for detecting the over-current protection function of the battery management system include: Obtain the current value of the battery in the current normal state; Modify the over-current protection alarm threshold on the host computer so that it is lower than the current value of the battery; The battery management system performs over-current protection detection on the battery.

[0034] In this embodiment, first, obtain the current value of the battery to be measured in the current state under normal conditions. When measuring the over-current protection function of the battery management system, modify the over-current protection alarm threshold to be lower than the current value in the current state. If the over-current protection function of the battery management system is normal, an alarm message indicating over-current will be issued; if the over-current protection function of the battery management system fails, no alarm message indicating over-current will be issued. Thus, it can be determined whether the over-current protection function of the battery management system is effective when the over-current protection alarm threshold is modified to normal.

[0035] Further, in one embodiment, the steps for detecting the under-current protection function of the battery management system include: Obtain the current value of the battery in the current normal state; Modify the under-current protection alarm threshold on the host computer so that it is higher than the current value of the battery; The battery management system performs under-current protection detection on the battery.

[0036] In this embodiment, first, obtain the current value of the battery under test in the normal state. When measuring the battery under-voltage protection function of the battery management system, modify the battery under-voltage protection alarm threshold to be higher than the current value. If the battery under-voltage protection function of the battery management system is normal, an alarm message indicating that the battery current is too low will be issued; if the battery under-voltage protection function of the battery management system fails, no alarm message indicating that the battery current is too low will be issued. Thus, it can be determined whether the battery under-voltage protection function is effective when the battery under-voltage protection alarm threshold is modified to normal for the battery management system.

[0037] Further, in one embodiment, the steps for detecting the battery over-voltage protection function of the battery management system include: Obtain the voltage value of the battery cell in the current normal state; Modify the battery over-voltage protection alarm threshold on the host computer to be lower than the voltage value of the current battery cell; The battery management system performs battery over-voltage protection detection.

[0038] In this embodiment, first, obtain the voltage value of the battery cell under test in the normal state. When measuring the battery over-voltage protection function of the battery management system, modify the battery over-voltage protection alarm threshold to be lower than the voltage value of the current battery cell. If the battery over-voltage protection function of the battery management system is normal, an alarm message indicating that the battery voltage is too high will be issued; if the battery over-voltage protection function of the battery management system fails, no alarm message indicating that the battery voltage is too high will be issued. Thus, it can be determined whether the battery over-voltage protection function is effective when the battery over-voltage protection alarm threshold is modified to normal for the battery management system.

[0039] Further, in one embodiment, the steps for detecting the battery under-voltage protection function of the battery management system include: Obtain the voltage value of the battery cell in the current normal state; Modify the battery under-voltage protection alarm threshold on the host computer to be higher than the voltage value of the current battery cell; The battery management system performs battery under-voltage protection detection.

[0040] In this embodiment, first, obtain the voltage value of the single-cell voltage of the battery to be measured in the current state under normal conditions. When measuring the under-voltage protection function of the battery management system for the single-cell voltage of the battery, modify the under-voltage protection alarm threshold of the single-cell voltage of the battery to be higher than the voltage value of the single-cell voltage of the battery in the current state. If the under-voltage protection function of the battery management system for the single-cell voltage of the battery is normal, an alarm message for the under-voltage of the single-cell voltage of the battery will be issued; if the under-voltage protection function of the battery management system for the single-cell voltage of the battery fails, no alarm message for the under-voltage of the single-cell voltage of the battery will be issued. Thus, it can be determined whether the under-voltage protection function of the battery management system is effective when the under-voltage protection alarm threshold of the single-cell voltage of the battery is modified to normal.

[0041] Further, in one embodiment, the steps for detecting the over-voltage protection function of the total voltage of the battery of the battery management system include: Obtain the voltage value of the total voltage of the battery in the current normal state; Modify the over-voltage protection alarm threshold of the total voltage of the battery on the host computer so that it is lower than the voltage value of the current total voltage of the battery; The battery management system performs over-voltage protection detection on the total voltage of the battery.

[0042] In this embodiment, first, obtain the voltage value of the total voltage of the battery to be measured in the current state under normal conditions. When measuring the over-voltage protection function of the battery management system for the total voltage of the battery, modify the over-voltage protection alarm threshold of the total voltage of the battery to be lower than the voltage value of the total voltage of the battery in the current state. If the over-voltage protection function of the battery management system for the total voltage of the battery is normal, an alarm message for the over-voltage of the total voltage of the battery will be issued; if the over-voltage protection function of the battery management system for the total voltage of the battery fails, no alarm message for the over-voltage of the total voltage of the battery will be issued. Thus, it can be determined whether the over-voltage protection function of the battery management system is effective when the over-voltage protection alarm threshold of the total voltage of the battery is modified to normal.

[0043] Further, in one embodiment, the steps for detecting the under-voltage protection function of the total voltage of the battery of the battery management system include: Obtain the voltage value of the total voltage of the battery in the current normal state; Modify the under-voltage protection alarm threshold of the total voltage of the battery on the host computer so that it is higher than the voltage value of the current total voltage of the battery; The battery management system performs under-voltage protection detection on the total voltage of the battery.

[0044] In this embodiment, first, obtain the voltage value of the total voltage of the battery under test in the current state under normal conditions. When measuring the low-voltage protection function of the total voltage of the battery in the battery management system, modify the low-voltage protection alarm threshold of the total voltage of the battery to be higher than the voltage value of the total voltage of the battery in the current state. If the low-voltage protection function of the total voltage of the battery in the battery management system is normal, an alarm message indicating that the total voltage of the battery is too low will be issued; if the low-voltage protection function of the total voltage of the battery in the battery management system fails, an alarm message indicating that the total voltage of the battery is too low will not be issued. Thus, it can be determined whether the low-voltage protection function of the total voltage of the battery is effective when the low-voltage protection alarm threshold of the total voltage of the battery in the battery management system is modified to normal.

[0045] In one embodiment, take the example of using this method to test the low-voltage protection function of a single battery in a battery management system for illustration.

[0046] First, send a test instruction for the low-voltage protection function of a single battery to the control module on the host computer. The control module determines a battery equalization control instruction according to the test instruction and sends the battery equalization control instruction to the battery management system. The battery management system adjusts the battery under test, and then makes the entire battery under test in a balanced state of voltage, current, and temperature through the battery equalization control instruction. Then, the acquisition module acquires the single-battery voltage value of the battery in the current state according to the acquisition instruction, measures that the single-battery voltage value of the battery in the current state is 2042 mV, and sends the acquired single-battery voltage value of 2042 mV of the battery to the host computer.

[0047] The host computer reads that the single-battery voltage value in the current battery equalization state is 2042 mV. By modifying the low-voltage protection alarm threshold of a single battery on the host computer and modifying the alarm threshold to 1800 mV, the single-battery voltage of the battery in the current normal state will exceed the low-voltage protection alarm threshold of a single battery, triggering the low-voltage protection alarm of the single battery in the battery management system.

[0048] If, at this time, the battery management system issues an alarm message for the low-voltage protection of a single battery, the low-voltage protection function of the single battery in the battery management system is normal. If, at this time, the battery management system does not issue an alarm message for the low-voltage protection of a single battery, the low-voltage protection function of the single battery in the battery management system fails.

[0049] Finally, modify the low-voltage protection alarm threshold of the single battery in the battery management system to the normal threshold to complete the test of the protection function of the battery management system. Thus, it can be determined whether the low-voltage protection function of the single battery in the battery management system can be used normally.

[0050] A test method for the protection function of a battery management system provided by this application does not require the battery under test to actually reach the test conditions when performing a functional protection test on the battery management system. First, the upper computer controls the acquisition module to detect the state of the battery under test, and then the BMS upper computer modifies the corresponding parameters to directly trigger the BMS protection items that need to be tested. This avoids the problem of the battery truly triggering an alarm. In a low-temperature or high-temperature environment, an environmental chamber is required to achieve the true low-temperature or high-temperature environment. For high voltage or low voltage, the battery needs to be charged and discharged to trigger, resulting in a large amount of energy waste. The method provided by this application is simple and easy to operate and saves energy.

[0051] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention. Finally, it should also be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the element.

[0052] The above has introduced in detail a test method for the protection function of a battery management system provided by an embodiment of this application. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the technical solution and its core idea of this application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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 this application.

Claims

1. A test method for the protection function of a battery management system, characterized in that Including: The host computer sends a function test instruction to the control module, and the control module sends a battery information acquisition instruction to the acquisition module according to the test instruction; The acquisition module acquires battery information and sends it to the host computer; According to the battery information, the battery status alarm threshold in the host computer is adjusted to be less than the value under the normal battery state, and the battery over-temperature protection function, battery under-temperature protection function, battery over-current protection function, battery under-current protection function, battery single voltage over-high protection function, battery single voltage under-low protection function, battery total voltage over-high protection function, and battery total voltage under-low protection function of the battery management system are detected; Judge whether the battery management system issues an alarm message; if the battery management system issues an alarm message, the protection function of the battery management system is normal; if the battery management system does not issue an alarm message, the protection function of the battery management system fails; Modify the battery status alarm threshold in the host computer to the normal threshold to complete the protection function test of the battery management system.

2. The test method for the protection function of the battery management system according to claim 1, characterized in that The battery information includes: battery temperature information, battery current information, battery single voltage information, and battery total voltage information.

3. The test method for the battery management system protection function according to claim 2, wherein The steps for detecting the battery over-temperature protection function of the battery management system include: Obtain the battery temperature of the battery under the current normal state; Modify the battery over-temperature protection alarm threshold on the host computer to be lower than the current battery temperature; The battery management system performs battery over-temperature protection detection.

4. The test method for the battery management system protection function according to claim 2, characterized in that The steps for detecting the battery under-temperature protection function of the battery management system include: Obtain the battery temperature of the battery under the current normal state; Modify the battery under-temperature protection alarm threshold on the host computer to be higher than the current battery temperature; The battery management system performs battery under-temperature protection detection.

5. The test method for the battery management system protection function according to claim 2, characterized in that The steps for detecting the battery over-current protection function of the battery management system include: Obtain the current value of the battery under the current normal state; Modify the battery over-current protection alarm threshold on the host computer to be lower than the current battery current value; The battery management system performs battery over-current protection detection.

6. The test method for the protection function of the battery management system according to claim 2, characterized in that The steps for detecting the battery under-current protection function of the battery management system include: Obtain the current value of the battery under the current normal state; Modify the battery under-current protection alarm threshold on the host computer to be higher than the current battery current value; The battery management system performs battery under-current protection detection.

7. The test method for the battery management system protection function according to claim 2, characterized in that, The steps for detecting the battery single voltage over-high protection function of the battery management system include: Obtain the voltage value of the battery single voltage under the current normal state; Modify the battery single voltage over-high protection alarm threshold on the host computer to be lower than the current battery single voltage value; The battery management system performs battery single voltage over-high protection detection.

8. The test method for the battery management system protection function according to claim 2, wherein The steps for detecting the battery single voltage under-low protection function of the battery management system include: Obtain the voltage value of the battery single voltage under the current normal state; Modify the battery single voltage under-low protection alarm threshold on the host computer to be higher than the current battery single voltage value; The battery management system performs battery single voltage under-low protection detection.

9. The test method for the battery management system protection function according to claim 2, wherein The steps for detecting the battery total voltage over-high protection function of the battery management system include: Obtain the voltage value of the total battery voltage under the current normal state; Modify the overvoltage protection alarm threshold of the total battery voltage on the host computer to make it lower than the voltage value of the current total battery voltage; The battery management system performs overvoltage protection detection of the total battery voltage.

10. The test method for the battery management system protection function according to claim 2, characterized in that, The steps for detecting the undervoltage protection function of the battery management system are as follows: Obtain the voltage value of the total battery voltage under the current normal state; Modify the undervoltage protection alarm threshold of the total battery voltage on the host computer to make it higher than the voltage value of the current total battery voltage; The battery management system performs undervoltage protection detection of the total battery voltage.

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