New energy automobile battery pack off-line detection device and detection method

Abstract

The invention discloses a new energy automobile battery pack off-line detection device and method, the new energy automobile battery pack off-line detection device comprises a device body, a terminal and a power adapter, the device body is connected to an off-automobile to-be-detected battery pack through the terminal, the power adapter is connected to the device body, and the power adapter is connected to the device body through the terminal. The device body is connected with the terminal and provides a low-voltage power supply for the battery pack through the terminal, and the device body is used for receiving unanalyzed message data of different CAN data lines sent by a BMS control system of the battery pack according to a preset signal frequency, analyzing the message data and reading data information of the battery pack. Compared with an OBD detection mode in the prior art, the battery pack does not need to be disassembled repeatedly, meanwhile, the method is suitable for maintenance and diagnosis in different scenes, in addition, the voltage of all the single battery cells can be read, temperature data of the battery pack can be automatically read, and application requirements are well met.

Description

Technical Field

[0001] The present invention relates to a new energy vehicle battery pack detection system, and in particular to a new energy vehicle battery pack offline detection device and detection method. Background Art

[0002] During the repair and maintenance of new energy vehicles, it is often necessary to test the battery pack. In the existing detection method, the operating data of the vehicle's power battery, drive motor, electronic control system, and other information, as well as fault data, can be read through the vehicle service end interface (OBD). This process should comply with the diagnostic terminal collection and inspection data communication protocol. In actual applications, the battery pack needs to be installed and reset before being tested through OBD, which will cause repeated disassembly of the battery pack, resulting in increased workload. In addition, OBD is a vehicle service end data interface, not a special interface for battery pack data, and there is an incomplete collection of battery pack data. Therefore, the existing detection method has the following problems: it is impossible to detect the battery pack when it leaves the vehicle, there are many data items to read, and the diagnostic terminal collection and inspection data communication protocol stipulates that there is no data on all single cell voltages, that is, it is impossible to read all single cell voltages. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new energy vehicle battery pack offline detection device and detection method suitable for maintenance diagnosis in different scenarios, which can read the voltage of all single cells and automatically read the battery pack temperature data, in view of the shortcomings of the existing technology.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] A new energy vehicle battery pack offline detection device comprises a device body, a wiring terminal and a power adapter, wherein the device body is connected to a battery pack to be detected off the vehicle through the wiring terminal, the power adapter is connected to the device body and provides a low-voltage power supply to the battery pack through the wiring terminal, and the device body is used to receive unparsed message data of different CAN data lines sent by a BMS control system of the battery pack according to a preset signal frequency, and then parse the message data to read the data information of the battery pack.

[0006] Preferably, the battery pack includes a low-voltage signal communication interface, and the wiring terminal is connected to the low-voltage signal communication interface of the battery pack.

[0007] Preferably, an extension line is connected between the device body and the connection terminal.

[0008] A new energy vehicle battery pack offline detection method, the detection method is implemented based on a detection device, the detection device includes a device body, a wiring terminal and a power adapter, the wiring terminal and the power adapter are respectively connected to the device body, the detection method includes the following steps: step S1, connecting the wiring terminal to a battery pack to be detected off the vehicle, and the power adapter provides a low-voltage power supply to the battery pack through the wiring terminal; step S2, the device body receives unparsed message data of different CAN data lines sent by the BMS control system of the battery pack according to a preset signal frequency; step S3, the device body parses the message data, and then reads the data information of the battery pack.

[0009] Preferably, the step S1 includes a process of confirming the positive and negative poles of the low-voltage communication interface and a process of confirming the signal line of the low-voltage communication interface.

[0010] Preferably, the process of confirming the positive and negative poles of the low-voltage communication interface includes: measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack through the DC voltage range of the multimeter, if the measured value is about 12V, it is the positive pole, and then measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack through the on-off range of the multimeter, if the measurement is conductive, it is the negative pole.

[0011] Preferably, the process of confirming the low-voltage communication interface signal line includes: measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack through the DC voltage range of a multimeter, wherein the CAN line includes a CANH line and a CANL line.

[0012] Preferably, the voltage values ​​of the CANH line and the CANL line are 1.5V-3.5V, and the sum of the two is 5V, wherein the higher voltage value is the CANH line, and the lower voltage value is the CANL line.

[0013] Preferably, the step S2 further includes selecting a corresponding battery pack model and voltage capacity according to the battery pack nameplate, and then identifying a preset signal frequency.

[0014] Preferably, in step S3, the data displayed after the device body parses the message data includes various data of the battery pack total voltage, single cell voltage, SOC, SOH, pressure difference and temperature.

[0015] In the offline detection device for the battery pack of a new energy vehicle disclosed in the present invention, the wiring terminal and the power adapter are respectively connected to the device body. Before the specific detection, the wiring terminal is first connected to the battery pack to be detected that is off the vehicle, and the power adapter provides a low-voltage power supply to the battery pack through the wiring terminal. After completing the low-voltage power supply and signal connection, the device body receives the unparsed message data of different CAN data lines sent by the BMS control system of the battery pack according to the preset signal frequency, and the device body parses the message data, and then reads the data information of the battery pack. Compared with the OBD detection method in the prior art, the present invention does not need to repeatedly disassemble the battery pack, and is suitable for maintenance diagnosis in different scenarios. In addition, the present invention can read the voltage of all single cells and can automatically read the temperature data of the battery pack, which better meets the application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of the offline detection method for new energy vehicle battery packs of the present invention; Figure 2 This is a block diagram of an offline detection device for a new energy vehicle battery pack according to an embodiment of the present invention; Figure 3 It is a block diagram of another embodiment of the offline detection device for a new energy vehicle battery pack of the present invention; Figure 4 Take a screenshot of the battery pack detection software interface; Figure 5 This is a diagram showing how to use the battery pack detection software; Figure 6 This is a diagram of the message data content. DETAILED DESCRIPTION

[0017] The present invention is described in more detail below with reference to the accompanying drawings and embodiments.

[0018] The present invention discloses an off-line detection device for a new energy vehicle battery pack, see Figure 1 and Figure 2 , which includes a device body 1, a terminal 2 and a power adapter 3. The device body 1 is connected to a battery pack 4 to be detected off the vehicle through the terminal 2. The power adapter 3 is connected to the device body 1 and provides a low-voltage power supply to the battery pack 4 through the terminal 2. The device body 1 is used to receive unparsed message data from different CAN data lines sent by the BMS control system of the battery pack 4 according to a preset signal frequency, and then parse the message data to read the data information of the battery pack 4.

[0019] In the above device, the wiring terminal 2 and the power adapter 3 are respectively connected to the device body 1. Before the specific detection, the wiring terminal 2 is first connected to the battery pack 4 to be detected off the vehicle. The power adapter 3 provides a low-voltage power supply to the battery pack 4 through the wiring terminal 2. After completing the low-voltage power supply and signal connection, the device body 1 receives the unparsed message data of different CAN data lines sent by the BMS control system of the battery pack 4 according to the preset signal frequency. The device body 1 parses the message data and then reads the data information of the battery pack 4. Compared with the OBD detection method in the prior art, the present invention does not need to repeatedly disassemble the battery pack, and is suitable for maintenance diagnosis in different scenarios. In addition, the present invention can read the voltage of all single cells and can automatically read the temperature data of the battery pack, which better meets the application requirements.

[0020] As a preferred wiring method of the present invention, please refer to Figure 2 The battery pack 4 includes a low-voltage signal communication interface, and the terminal 2 is connected to the low-voltage signal communication interface of the battery pack 4.

[0021] Specifically, the connection terminal 2 is connected to the low-voltage signal communication interface of the battery pack 4 through a preset dedicated connector. On this basis, an extension line 5 is connected between the device body 1 and the connection terminal 2.

[0022] In practical applications, in addition to using a dedicated connector, this embodiment can also be connected through a jumper. Figure 3 In another preferred embodiment of the present invention, the wiring terminal 2 is connected to the low-voltage signal communication interface of the battery pack 4 through a Jump-8 jumper and a preset adapter cable.

[0023] Based on the above connection method, in the actual working process, the present invention first establishes the connection between the low-voltage power supply and the control signal: the low-voltage communication interface of the battery pack is powered by the detection device of the present invention, and then the signal line is connected. Specifically, first confirm the positive and negative poles of the low-voltage communication interface, test the low-voltage communication interface of the corresponding component on the vehicle body end through the DC voltage range of the multimeter, and the measured value is about 12V for the positive pole, and measure the low-voltage communication interface of the corresponding component on the vehicle body end through the on-off range of the multimeter, and the measured value is negative; then confirm the signal line of the low-voltage communication interface, and test the low-voltage communication interface of the corresponding component on the vehicle body end through the DC voltage range of the multimeter. The main signal form is CAN signal. The CAN line is divided into two lines, CANH and CANL, and the voltage value is about 1.5V-3.5V. The sum of the two is 5V. The higher voltage is CANH, and the lower voltage is CANL. Then connect the test connector to the positive and negative poles and signal lines measured by the low-voltage communication interface.

[0024] After that, supply power and analyze and read data messages: use a 12V adapter to supply low-voltage power to the battery pack. In addition, you can also use the low-voltage side of the adjustable power supply to supply low-voltage power to the battery pack. Then select the model through the computer software, select the corresponding voltage capacity option according to the nameplate of the tested battery pack, wait for the system components to respond and identify the signal frequency, then wait for the BMS to send the message data, parse the reply data message, and finally display the total voltage of the battery pack, single cell voltage, SOC, SOH, pressure difference, temperature and other data.

[0025] Based on the above detection device, the present invention also discloses an offline detection method for a new energy vehicle battery pack, see Figure 1 and Figure 2 The detection method is implemented based on a detection device, the detection device includes a device body 1, a terminal 2 and a power adapter 3, the terminal 2 and the power adapter 3 are respectively connected to the device body 1, and the detection method includes the following steps: Step S1, connecting the wiring terminal 2 to the battery pack 4 to be tested off the vehicle, and the power adapter 3 provides a low-voltage power supply to the battery pack 4 through the wiring terminal 2; Step S2, the device body 1 receives unparsed message data from different CAN data lines sent by the BMS control system of the battery pack 4 according to a preset signal frequency; In step S3 , the device body 1 parses the message data and then reads the data information of the battery pack 4 .

[0026] Based on the above detection method, the present invention performs analysis based on multiple groups of CAN data in the normal operation of the battery pack, wherein the battery pack data generally can exist in three groups of CAN: diagnostic CAN, internal CAN, and fast charging CAN. The present invention supplies a low-voltage power supply to the battery pack when leaving the vehicle. After connecting the signal line, the unparsed message data of different CAN data lines sent by the BMS control system is received according to the signal line frequency (CAN signal baud rate), and then the data message is parsed through the corresponding data, thereby automatically reading the battery pack voltage and temperature data. In practical applications, the present invention can read the voltage of all single cells, please refer to Figure 6 .

[0027] As a preferred embodiment, step S1 includes a process of confirming the positive and negative poles of the low-voltage communication interface and a process of confirming the signal line of the low-voltage communication interface.

[0028] Specifically, the process of confirming the positive and negative poles of the low-voltage communication interface includes: measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack 4 through the DC voltage range of the multimeter. If the measured value is about 12V, it is the positive pole; and then measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack 4 through the on-off range of the multimeter. If the measurement is conductive, it is the negative pole.

[0029] On this basis, the process of confirming the low-voltage communication interface signal line includes: measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack 4 through the DC voltage range of the multimeter, wherein the CAN line includes a CANH line and a CANL line, and the voltage values ​​of the CANH line and the CANL line are 1.5V-3.5V, and the sum of the two is 5V, wherein the line with a higher voltage value is the CANH line, and the line with a lower voltage value is the CANL line.

[0030] In practical applications, the present invention also needs to rely on a preset computer and preset detection software. For software interface and control method, please refer to Figure 4 and Figure 5 In this embodiment, the step S2 further includes selecting the corresponding battery pack model and voltage capacity according to the battery pack nameplate, and then identifying the preset signal frequency. In the step S3, the data displayed after the device body parses the message data includes the data of the total voltage of the battery pack, the single cell voltage, SOC, SOH, the pressure difference and the temperature.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. An off-line detection device for a new energy vehicle battery pack, characterized in that: The invention comprises a device body, a wiring terminal and a power adapter. The device body is connected to a battery pack to be detected off the vehicle through the wiring terminal. The power adapter is connected to the device body and provides a low-voltage power supply to the battery pack through the wiring terminal. The device body is used to receive unparsed message data of different CAN data lines sent by the BMS control system of the battery pack according to a preset signal frequency, and then parse the message data to read the data information of the battery pack.

2. The off-line detection device for new energy vehicle battery pack according to claim 1, characterized in that: The battery pack includes a low-voltage signal communication interface, and the wiring terminal is connected to the low-voltage signal communication interface of the battery pack.

3. The off-line detection device for new energy vehicle battery pack according to claim 1, characterized in that: An extension line is connected between the device body and the connection terminal.

4. A new energy vehicle battery pack offline detection method, characterized in that: The detection method is implemented based on a detection device, the detection device includes a device body, a wiring terminal and a power adapter, the wiring terminal and the power adapter are respectively connected to the device body, and the detection method includes the following steps: Step S1, connecting the wiring terminal to a battery pack to be tested off the vehicle, and the power adapter provides a low-voltage power supply to the battery pack through the wiring terminal; Step S2, the device body receives unparsed message data from different CAN data lines sent by the BMS control system of the battery pack according to a preset signal frequency; Step S3, the device body parses the message data and then reads the data information of the battery pack.

5. The off-line detection method for a new energy vehicle battery pack according to claim 4, characterized in that: The step S1 includes a process of confirming the positive and negative poles of the low-voltage communication interface and a process of confirming the signal line of the low-voltage communication interface.

6. The off-line detection method for a new energy vehicle battery pack according to claim 5, characterized in that: The process of confirming the positive and negative poles of the low-voltage communication interface includes: measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack through the DC voltage range of the multimeter. If the measured value is about 12V, it is the positive pole; and then measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack through the on-off range of the multimeter. If the measurement is conductive, it is the negative pole.

7. The off-line detection method for a new energy vehicle battery pack according to claim 5, characterized in that: The process of confirming the low-voltage communication interface signal line includes: measuring the low-voltage communication interface of the corresponding component on the vehicle body end that matches the battery pack through the DC voltage range of the multimeter, wherein the CAN line includes a CANH line and a CANL line.

8. The off-line detection method for a new energy vehicle battery pack according to claim 7, characterized in that: The voltage values ​​of the CANH line and the CANL line are 1.5V-3.5V, and the sum of the two is 5V, wherein the higher voltage value is the CANH line, and the lower voltage value is the CANL line.

9. The off-line detection method for a new energy vehicle battery pack according to claim 4, characterized in that: The step S2 also includes selecting the corresponding battery pack model and voltage capacity according to the battery pack nameplate, and then identifying the preset signal frequency.

10. The off-line detection method for a new energy vehicle battery pack according to claim 4, characterized in that: In the step S3, the data displayed after the device body parses the message data includes various data of the total voltage of the battery pack, single cell voltage, SOC, SOH, pressure difference and temperature.

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