Data acquisition test platform for battery management system

Abstract

The invention discloses a data acquisition test platform for a battery management system, and the platform comprises an upper computer which is used for reading the voltage and temperature measurement results of a single battery in real time; the communication protocol conversion device is used for receiving and forwarding the voltage and temperature measurement results of the single batteries to the upper computer; the battery management system is used for acquiring voltage and temperature measurement results of the single batteries and sending the voltage and temperature measurement results to the communication protocol switching device; the environment simulation device is used for setting environment simulation of the battery management system to be normal experiment environment requirements specified in a standard test method; the battery simulation device is used for inputting the voltage, read by the upper computer, of the single battery to the battery management system and measuring the voltage precision of the single battery; and the power supply is used for inputting different currents and voltages to the battery management system and measuring the total voltage precision and the current precision of the battery management system. According to the invention, the test cost is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of test platforms, and in particular relates to a battery management system data acquisition test platform. Background Art

[0002] The battery management system (BMS) is an important link between lithium-ion batteries and battery energy storage systems. The battery management system is the core component of the battery energy storage system. It can not only prevent the battery from overcharging and over-discharging, and prolong the battery life, but also monitor the working status of each internal battery, effectively preventing the occurrence of safety accidents. With the rapid development of my country's energy storage industry, the demand for BMS testing is gradually increasing. BMS testing needs to read and collect the information of the single cells in the energy storage system. However, in order to reduce the cost of BMS, many companies have begun to adopt a BMS centralized architecture design through daisy chain technology, retaining only the microcontroller on the BMS mainboard, and simplifying the original slave board to a small board that simply revolves around the AFE chip function. The information collected by the AFE is directly transmitted to the mainboard through differential isolation signals. Each chip manufacturer has also developed the technology of differential signal communication between AFEs and converted the differential signal into SPI or UART protocols to communicate with the microcontroller. At present, there is no universal industry standard. Each chip manufacturer has its own private protocol. However, it is difficult for testing agencies to obtain the private protocol of product chips through customers. In the actual BMS acquisition accuracy test process, since the AFE chip manufacturers used by different models of BMS use private protocols, the testing agency cannot collect the voltage and temperature information of the battery cells in the BMS. The current common practice is to connect voltage, temperature and other sampling lines to each battery cell and read the cell information through the sampling device. This method is not only time-consuming and labor-intensive, but also requires different projects to rebuild the test environment. It is difficult to achieve hardware reuse between different test projects, which increases the BMS test cost and reduces the test efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a battery management system data acquisition test platform, which can realize the real-time acquisition of voltage and temperature signals of battery cells in battery energy storage systems of different models. The hardware can be reused between different test items, which reduces the test cost and improves the test efficiency.

[0004] To achieve the above object, the present invention provides a battery management system data acquisition test platform, including: a host computer, a communication protocol conversion device, a battery management system, an environment simulation device, a battery simulation device and a power supply;

[0005] The host computer is used to read the voltage and temperature measurement results of the battery cells in real time;

[0006] The communication protocol conversion device is used to receive and forward the voltage and temperature measurement results of the battery cell to the host computer;

[0007] The battery management system is used to collect the voltage and temperature measurement results of the battery cells and send them to the communication protocol conversion device;

[0008] The environmental simulation device is used to set the environmental simulation of the battery management system to the normal experimental environment requirements specified in the standard test method;

[0009] The battery simulation device is used to input the voltage of the battery cell read by the host computer into the battery management system to measure the voltage accuracy of the battery cell;

[0010] The power supply is used to input different currents and voltages into the battery management system and measure the total voltage accuracy and current accuracy of the battery management system.

[0011] Optionally, the battery management system includes a central processing module, a data acquisition and detection module, a display module and a control component;

[0012] The central processing module is used to sense the battery status and send control signals;

[0013] The data acquisition and detection module is used to collect the voltage, current and temperature measurement results of the battery cells;

[0014] The display module is used to display and collect the collected voltage and temperature measurement results of the battery cells;

[0015] The control component is used to control the operation process of the entire battery according to the request of the central processing module.

[0016] Optionally, the data acquisition and detection module is provided with a separate AFE chip.

[0017] Optionally, the communication protocol conversion device includes an MCU chip, a data processing chip and a CAN communication chip;

[0018] The MCU chip is used to send a query instruction to the AFE chip according to the private protocol of each manufacturer, and receive and forward the voltage and temperature measurement results of the battery cell reported by the AFE chip;

[0019] The data processing chip is used to read the voltage and temperature measurement results of the battery cells, organize the read voltage and temperature measurement results of the battery cells according to the specified communication protocol, and send the organized data to the CAN communication chip;

[0020] The CAN communication chip is used to receive the sorted data and send it to the host computer.

[0021] Optionally, the MCU chip and the AFE chip are connected in a daisy chain.

[0022] Optionally, the battery management system is placed in the environmental simulation device.

[0023] Technical effect of the invention: The invention discloses a battery management system data acquisition test platform, which reads the operating data between different modules through the MCU chip, solves the synchronization problem of the collected data through the timestamp form, and realizes the association between the collected data signal and the power module operation signal through the built-in driver of the MUC chip, thereby solving the problem that the battery cell information is difficult to collect during the conventional BMS test process. The present invention is suitable for testing battery management systems for electric energy storage, and can realize the real-time collection of battery cell voltage and temperature signals in battery energy storage systems of different models. The test platform can be reused between different test items, which reduces the test cost and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is a structural schematic diagram of a communication protocol conversion device according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a battery management system data acquisition test platform according to an embodiment of the present invention;

[0027] The symbols in the figure mean the following:

[0028] 1. Host computer; 2. Communication protocol conversion device; 21. CAN communication chip; 22. Data processing chip; 23. MCU chip; 3. Battery management system; 31. Daisy chain; 32. AFE chip; 4. Environmental simulation device; 5. Battery simulation device; 6. Power supply. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0031] like Figure 2As shown, this embodiment provides a battery management system data acquisition test platform, including:

[0032] Host computer 1, communication protocol conversion device 2, battery management system 3, environment simulation device 4, battery simulation device 5 and power supply 6;

[0033] Host computer 1, used to read the voltage and temperature measurement results of the battery cells in real time;

[0034] The communication protocol conversion device 2 is used to receive and forward the voltage and temperature measurement results of the battery cell to the host computer 1;

[0035] The battery management system 3 is used to collect the voltage and temperature measurement results of the battery cells and send them to the communication protocol conversion device 2;

[0036] An environmental simulation device 4, used to set the environmental simulation of the battery management system 3 to the normal experimental environment requirements specified in the standard test method;

[0037] The battery simulation device 5 is used to input the voltage of the battery cell read by the host computer 1 to the battery management system 3 and measure the voltage accuracy of the battery cell;

[0038] The power supply 6 is used to input different currents and voltages to the battery management system 3 and measure the total voltage accuracy and current accuracy of the battery management system 3 .

[0039] Furthermore, the battery management system 3 includes a central processing module, a data acquisition and detection module, a display module and a control component;

[0040] The central processing module is used to sense the battery status and send control signals;

[0041] The data acquisition and detection module is used to collect the voltage, current and temperature measurement results of the battery cells;

[0042] The display module is used to display and collect the collected voltage and temperature measurement results of the battery cells;

[0043] The control component is used to control the operation process of the entire battery according to the request of the central processing module to prevent the battery from overvoltage, undervoltage, overtemperature, overcharge, overdischarge, overcurrent and other faults.

[0044] Furthermore, the data acquisition and detection module is provided with a separate AFE chip 32 .

[0045] Further, such as Figure 1 The communication protocol conversion device 2 shown includes an MCU chip 23, a data processing chip 22 and a CAN communication chip 21;

[0046] The MCU chip 23 is used to send query instructions to the AFE chip 32 according to the private protocol of each manufacturer, and receive and forward the voltage and temperature measurement results of the battery cell reported by the AFE chip 32;

[0047] The data processing chip 22 is used to read the voltage and temperature measurement results of the battery cells, organize the voltage and temperature measurement results of the battery cells according to the specified communication protocol, and send the organized data to the CAN communication chip 21;

[0048] The CAN communication chip 21 is used to receive the sorted data and send it to the host computer 1.

[0049] Furthermore, the MCU chip 23 and the AFE chip 32 are connected using a daisy chain 31 .

[0050] Furthermore, the battery management system 1 is placed in an environmental simulation device 4 .

[0051] Furthermore, the host computer 1 includes a communication module, a display module, a data storage module, and an alarm module, wherein the communication module can realize the issuance of instructions and the reception of data through the support of the protocol; the display module can display the data of the system and the battery on the user interface, such as the battery current, voltage, SOC and other information; the data storage module can store the status data of the battery pack and the operation data of the system; the alarm module can receive data exceeding the protection value or other abnormal status information in the host computer software, and remind the staff to correct the problem in time in the form of an alarm.

[0052] Furthermore, the environmental simulation device 4 includes a high and low temperature humidity test chamber, which can simulate the test environment to the normal experimental environment requirements specified in the standard test method.

[0053] Furthermore, the battery simulation device 5 includes a function of simulating different battery cell voltages and can achieve high-precision voltage measurement, thereby verifying the battery cell voltage accuracy of the battery management system under different cell voltage conditions.

[0054] Furthermore, the power supply 6 includes the function of simulating the total voltage and total current of different battery systems, and can achieve high-precision current and voltage measurement, thereby verifying the total voltage accuracy and current accuracy of the battery management system under different total voltage and current conditions.

[0055] The first scheme for collecting battery cell voltage data based on the aforementioned battery management system data collection test platform includes:

[0056] S1. Select the interface corresponding to the voltage acquisition channel of the battery management system 3, connect the data acquisition line of the battery management system 3 and the battery simulation device 5, and connect the power supply line of the battery management system 3.

[0057] S2. Place the battery management system 3 in the environmental simulation device 4 and set the temperature of the environmental simulation device 4 to (25±2)°C.

[0058] S3. Let stand for 1 hour.

[0059] S4 , turning on the power supply of the battery management system 3 , and checking the display information of the battery management system 3 through the host computer 1 .

[0060] S5. The host computer 1 adjusts the battery simulation device 5 to input 5 voltage values. The voltage values ​​selected should be the upper limit value, the lower limit value and three values ​​evenly distributed within the upper and lower limits of the voltage sampling of the battery simulation device 5.

[0061] S6. Record the temperature value of the environment simulation device 4, the voltage sampling upper limit and lower limit of the battery management system 3, the voltage output value of the battery simulation device 5 and the corresponding display value of the host computer 1.

[0062] S7. Repeat S5 and S6 twice.

[0063] S8. When the battery cell voltage of the battery simulation device 5 is less than 5V or the battery cluster / stack voltage is less than 500V, calculate and record the battery cell and battery cluster / stack voltage acquisition error corresponding to the battery management system 3 each time according to formula (1):

[0064] δ v1 =|U c1 -U R1 |(1),

[0065] Among them, δ v1 The battery voltage acquisition error of the same battery management system; U R1 Output value of the battery simulation device corresponding to the same group; U c1 Displays values ​​for the corresponding battery management system for the same group.

[0066] S9. When the voltage of the battery cell of the battery simulation device 5 is greater than or equal to 5V, or the voltage of the battery cluster / stack is greater than or equal to 500V, calculate and record the voltage acquisition error of the battery cell and battery / stack of each test sample according to formula (2):

[0067] δ v2 =|U c2 -U R2 | / U R2 ×100%(2),

[0068] Among them, δ v2 is the battery voltage acquisition error of the same group of test samples; U R2 Output value of the battery simulation device corresponding to the same group; U c2Values ​​are shown for corresponding test samples of the same group.

[0069] S10, set the temperature of the environmental simulation device 4 to (-20±2) (65±2)°C respectively, and repeat S3 to S9.

[0070] S11 , disconnect the power supply of the battery management system 3 and the battery simulation device 5 , remove the data acquisition line, and take out the battery management system.

[0071] S12. Replace the test sample and repeat S1 to S11.

[0072] S13. Take the maximum value of the battery voltage acquisition errors in all battery management systems as the test result.

[0073] The second scheme for collecting battery cell voltage data based on the above-mentioned battery management system data collection test platform includes:

[0074] S1. Select the interface corresponding to the battery temperature acquisition channel of the battery management system 3, connect the data acquisition line of the battery management system 3 and the battery simulation device 5, and connect the power supply line of the battery management system 3.

[0075] S2. Place the battery management system 3 in the environmental simulation device 4 and set the temperature of the environmental simulation device 4 to (25±2)°C.

[0076] S3. Let stand for 1 hour.

[0077] S4 , turning on the power supply of the battery management system 3 , and checking the display information of the battery management system 3 .

[0078] S5. Adjust the battery simulation device to output temperatures of -40°C, -15°C, 0°C, 25°C, 40°C, 60°C, 85°C, and 125°C in sequence.

[0079] S6 , recording the temperature value of the environment simulation device 4 , the temperature output value of the battery simulation device 5 , and the corresponding display value of the battery management system 3 .

[0080] S7. Repeat S5 and S6 twice.

[0081] S8. Calculate and record the temperature acquisition error corresponding to the battery management system 3 each time according to formula (3):

[0082] ΔT=|T C -T R |(3),

[0083] Among them, ΔT is the temperature acquisition error of the same battery management system 3; T R Output value of the battery simulation device corresponding to the same group: T C The battery management system 3 displays values ​​corresponding to the same group.

[0084] S9, respectively set the temperature of the environmental simulation device 4 to (-20±2)°C and 65±2)°C, and repeat S3 to S8.

[0085] S10 , disconnect the power supply of the battery management system 3 and the battery simulation device 5 , remove the data acquisition line, and take out the battery management system 3 .

[0086] S11, replace the battery management system 3, and repeat S1 to S9.

[0087] S12. Take the maximum value of the temperature acquisition errors in all battery management systems 3 as the test result.

[0088] The present invention discloses a battery management system data acquisition test platform, which reads the operation data between different modules through the MCU chip, solves the synchronization problem of the collected data through the timestamp form, and realizes the association between the collected data signal and the power module operation signal through the built-in driver of the MUC chip, thereby solving the problem that the battery cell information is difficult to collect during the conventional BMS test process. The present invention is suitable for testing a battery management system for electric energy storage, and can realize the real-time collection of battery cell voltage and temperature signals in battery energy storage systems of different models. The test platform can be reused between different test items, which reduces the test cost and improves the test efficiency.

[0089] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery management system data acquisition test platform, characterized in that: include: A host computer (1), a communication protocol conversion device (2), a battery management system (3), an environment simulation device (4), a battery simulation device (5) and a power source (6); The host computer (1) is used to read the voltage and temperature measurement results of the battery cells in real time; The communication protocol conversion device (2) is used to receive and forward the voltage and temperature measurement results of the battery cell to the host computer (1); The battery management system (3) is used to collect voltage and temperature measurement results of battery cells and send them to the communication protocol conversion device (2); The environmental simulation device (4) is used to set the environmental simulation of the battery management system (3) to the normal experimental environment requirements specified in the standard test method; The battery simulation device (5) is used to input the voltage of the battery cell read by the host computer (1) into the battery management system (3) to measure the voltage accuracy of the battery cell; The power supply (6) is used to input different currents and voltages into the battery management system (3) and measure the total voltage accuracy and current accuracy of the battery management system (3).

2. The battery management system data acquisition test platform according to claim 1, characterized in that: The battery management system (3) comprises a central processing module, a data acquisition and detection module, a display module and a control component; The central processing module is used to sense the battery status and send control signals; The data acquisition and detection module is used to collect the voltage, current and temperature measurement results of the battery cells; The display module is used to display and collect the collected voltage and temperature measurement results of the battery cells; The control component is used to control the operation process of the entire battery according to the request of the central processing module.

3. The battery management system data acquisition test platform as claimed in claim 2, characterized in that: The data acquisition and detection module is provided with a separate AFE chip (32).

4. The battery management system data acquisition test platform as claimed in claim 3, characterized in that: The communication protocol conversion device (2) comprises an MCU chip (23), a data processing chip (22) and a CAN communication chip (21); The MCU chip (23) is used to send a query instruction to the AFE chip (32) according to the private protocol of each manufacturer, and receive and forward the voltage and temperature measurement results of the battery cell reported by the AFE chip (32); The data processing chip (22) is used to read the voltage and temperature measurement results of the battery cells, organize the read voltage and temperature measurement results of the battery cells according to a specified communication protocol, and send the organized data to the CAN communication chip (21); The CAN communication chip (21) is used to receive the sorted data and send it to the host computer (1).

5. The battery management system data acquisition test platform as claimed in claim 4, characterized in that: The MCU chip (23) and the AFE chip (32) are connected using a daisy chain (31).

6. The battery management system data acquisition test platform according to claim 1, characterized in that: The battery management system (1) is placed in the environmental simulation device (4).

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