A new energy vehicle testing device, testing system and testing method

Abstract

The present invention discloses a test device, a detection system and a detection method for new energy vehicles. The detection system is used in the maintenance and detection of new energy vehicles. When the detection method detects, the connection end is connected to the charging end of the target vehicle, and the control module obtains the information of voltage and current or the information of voltage, current and leakage current and judges whether the target vehicle meets the charging requirements or uses the OBD module to obtain the signal of the target vehicle to judge the status of the power battery, drive motor and electronic control of the connected vehicle and generate a detection report based on the detection parameters and according to the preset model. The static and dynamic conditions of the new energy vehicle can be more comprehensively reflected through the detection data, so that the operation safety of the new energy vehicle is effectively guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicle detection, and specifically to a testing device, a detection system and a detection method for new energy vehicles. Background Art

[0002] With the continuous rise of new energy vehicles in the automotive field, their market share is also increasing. For new energy vehicles, the smooth and safe operation of the "three electrics" (battery, motor and electronic control) in its core technology is related to the quality of new energy vehicles and the safety of drivers and passengers. Although there are corresponding methods for the detection of the "three electrics" in the existing technology, they are relatively simple. For example, when the battery is charged, its charging voltage and other data can be known through the charging equipment, but there is no better detection method for the battery status during the discharge process, especially for the regular detection of new energy vehicles (such as annual inspection). There is no suitable detection method. Summary of the invention

[0003] The purpose of the present invention is to provide a testing device, a detection system and a detection method for new energy vehicles. The system is used for regular inspection, maintenance and other occasions of new energy vehicles, and by identifying potential hidden dangers, the operating safety of new energy vehicles is effectively guaranteed.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A test device for testing new energy vehicles, comprising:

[0006] A charging safety detection device, the charging safety detection device comprising:

[0007] A housing, wherein a control module and a data processing module are disposed in the housing,

[0008] The housing is provided with a display module, an emergency switch and a main switch.

[0009] At least one storage portion is provided on the shell, and the storage portion is used to place a connection end, and the connection end is connected to a control module through a cable, and the connection end is used to connect to a charging end of a vehicle to detect a connected vehicle.

[0010] In one embodiment, the charging safety detection device further includes a wireless module, and the control module is electrically connected to the wireless module to transmit the processed data to the background server.

[0011] In one embodiment, the charging safety detection device further includes a voltage conversion circuit, which is electrically connected to the control module and the cable.

[0012] The voltage conversion circuit is controlled to operate based on the command of the control module to detect the connected vehicle.

[0013] In one embodiment, the charging safety detection device also includes an electrical safety detection device.

[0014] The electrical safety detection equipment includes a shell, in which a control board and a data processing module are arranged. At least one connecting part is provided on the shell, which is connected to the control board via a cable. The connecting part is used to connect to the charging terminal of the vehicle to detect the electrical insulation performance and potential equalization information of the connected vehicle.

[0015] In one embodiment, the information acquired by the electrical safety detection device is fed back to a data processing module therein, and is transmitted to a remote server after being processed by the data processing module.

[0016] In one embodiment, the electrical safety detection device includes a built-in metering module, which calculates insulation resistance information and potential information of the connected vehicle based on the information transmitted by the received data processing module to evaluate the insulation resistance and potential balance of the connected vehicle.

[0017] The present application embodiment provides a detection system, which includes the above-mentioned test equipment and OBD module,

[0018] The OBD module is connected to the target vehicle via Bluetooth or USB to obtain information of the connected vehicle, the information at least including information of the power battery, the drive motor and the electronic control.

[0019] The information obtained by the OBD module determines the status of the power battery, drive motor and electronic control of the connected vehicle.

[0020] The present application embodiment provides a detection method, which is used in the above-mentioned detection system, and the detection method includes:

[0021] Connect the connector to the charging terminal of the target vehicle.

[0022] Obtain parameter information of the target vehicle, the parameter information at least including voltage, current information or voltage, current and leakage current information

[0023] The control module determines whether the target vehicle meets the charging requirements based on the acquired information. If so, it performs charging process detection and discharging process detection.

[0024] Or use the OBD module to connect to the target vehicle,

[0025] Acquire the target vehicle's signals to evaluate the status of the target vehicle's power battery, drive motor and electronic control, and generate a test report according to the preset model.

[0026] In one embodiment, the charging process detection includes:

[0027] The charging safety inspection equipment is used to detect the maximum temperature of the power battery during charging, the maximum voltage of a single battery, the voltage range of a single battery, and the accuracy of the total voltage indication of the BMS, and a test report is generated.

[0028] In one embodiment, the discharge process detection includes:

[0029] Place the target vehicle at the preset position.

[0030] The maximum temperature of the power battery and the minimum voltage of a single battery are detected by the OBD reading device.

[0031] The insulation resistance and potential equalization parameters of the charging socket are tested by electrical safety testing equipment.

[0032] The loading is carried out in a constant force control mode, and the loading force is expressed as: F = 0.3F1L / (R+r),

[0033] Among them, F is the loading force of the vehicle chassis dynamometer, F1 is the vehicle drive shaft load, L is the roller center distance, R is the tire radius, and r is the roller radius; the target vehicle's driving speed is 40±2km / h, and the driving time is 300±10s.

[0034] Generate a test report.

[0035] In one embodiment, the discharge process detection further includes:

[0036] Use the OBD module to connect to the target vehicle,

[0037] The device reads the temperature of the drive motor and the motor controller based on the OBD reading, records the maximum temperature of the drive motor and the maximum temperature of the motor controller during the test, and generates a test report.

[0038] Compared with the existing technology, the beneficial effects of the present application are embodied in: the test equipment proposed in the present application is used to test the power battery safety, drive motor safety, electronic control system safety and electrical safety of new energy vehicles. The test data can more comprehensively reflect the static and dynamic conditions of new energy vehicles, thereby effectively ensuring the operating safety of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of a vehicle operation safety performance detection method according to an embodiment of the present application.

[0040] Figure 2 This is a schematic diagram of the structure of the charging safety detection device according to an embodiment of the present application.

[0041] Figure 3This is a schematic diagram of the structure of the electrical safety detection equipment according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0043] Aiming at the insufficiency of the detection of current new energy vehicles (such as pure electric vehicles and hybrid electric vehicles) after running for a period of time, the applicant proposes a testing device and a testing system for new energy vehicles.

[0044] The test equipment includes charging safety detection equipment and electrical safety detection equipment. The charging safety detection equipment is used to obtain information about the vehicle to which it is connected and determine whether it meets charging safety requirements, so as to identify potential defects and achieve reliable charging. The electrical safety detection equipment is used to obtain information about the vehicle to which it is connected and determine whether it meets safety requirements (such as insulation performance and potential equalization), that is, the electrical safety inspection equipment is connected to the charging socket of the new energy vehicle and / or the conductive parts of the vehicle body to read parameters, and judge whether it meets safety requirements based on the obtained parameters.

[0045] Preferably, the test equipment also includes a chassis dynamometer (also called a dynamometer), which is electrically connected to an OBD module (On-Board Diagnost i cs, an on-board automatic diagnostic system, and determines the information of the power battery, drive motor and electronic control of the connected vehicle based on the signal obtained by the OBD module, and determines whether it meets the requirements based on a preset module. If the dynamometer is used to carry the discharge of new energy vehicles, the discharge parameters are read based on the signal connection of the new energy vehicle obtained by the OBD module. The dynamometer adopts a four-axis eight-roller combination, and the front and rear wheelbases can be adjusted by inputting the wheelbase digitally. The main parameters measured by the device include the torque and speed on the roller shaft, and the power, vehicle speed, driving distance, etc. are calculated therefrom, which is the prior art and will not be elaborated in detail here.

[0046] In one embodiment, the OBD module is connected to the target vehicle (vehicle to be detected) via Bluetooth or a signal line (such as a USB line), through which the operating data and fault data of the vehicle's power battery, drive motor, and electronic control system can be read. In this way, hidden dangers can be identified in advance and maintenance can be carried out to reduce the occurrence of failures. The OBD module can work with charging safety detection equipment or dynamometers to identify potential hidden dangers of power batteries (power batteries). The OBD module can work with dynamometers to identify potential hidden dangers of drive motors and electronic controls.

[0047] In one embodiment, the charging safety detection device is as follows Figure 2 As shown, the charging safety detection device 100 includes a housing 110,

[0048] The housing 110 is provided with a control module and a data processing module (not shown).

[0049] A display module 120, an emergency switch 111 and a main switch 112 are arranged on one side of the shell 110. At least one storage portion 130 is arranged on the shell 110. The storage portion 130 is used to place a connection terminal 140. The connection terminal 140 is connected to the control module through a cable, and the connection terminal 140 is used to connect to the charging terminal of the vehicle.

[0050] During charging detection, the connection terminal 140 is connected / inserted into the target vehicle, and the control module obtains the voltage and current information or the voltage, current and leakage current information of the target vehicle, and determines whether the target vehicle meets the charging requirements. If a parameter of the target vehicle (connected vehicle) is detected to exceed the set threshold, a prompt is issued (such as displaying through the display module 120, prompting through a buzzer, etc.). When in use, the charging safety detection device is electrically connected to the mains or a power supply station (such as an energy storage power station).

[0051] In one embodiment, the bottom of the housing 110 of the charging safety detection device is provided with universal wheels, so as to facilitate movement.

[0052] In one embodiment, the control module is electrically connected to the wireless module, so that the data processed by the data processing module can be transmitted to the background server through the wireless module.

[0053] In one embodiment, the charging safety detection device further includes a voltage conversion circuit, which is electrically connected to the control module and the cable, and controls the voltage conversion circuit to operate based on the command of the control module to detect the connected vehicle. In this case, detection of different power ranges (such as 30KW / 60KW, which can be achieved by adjusting the output current to achieve different power adjustments) can be achieved.

[0054] In one embodiment, the electrical safety detection device is as follows Figure 3 As shown, the electrical safety detection device 200 includes a housing 210,

[0055] The housing 210 is provided with a control panel and a data processing module (not shown).

[0056] A display module 220 and an emergency switch 211 are arranged on the shell 210, and at least one connection portion is arranged on the shell 110, which is connected to the control panel via a cable 230. The connection portion is used to connect to the charging terminal of the vehicle to detect the electrical insulation performance and potential balance of the charging terminal. The acquired information can be fed back to the data processing module, and transmitted to the remote server after being processed by the data processing module. Preferably, the data processing module is connected to a storage module, which can temporarily store the processed information (feedback information on the electrical insulation performance and / or potential balance (between the shell and the shell) of the charging terminal). The charging interface of the charging terminal is a prior art and is not elaborated in detail here (such as the charging interface conforming to GB / T18487.1). The electrical safety detection equipment has a built-in metering module, through which insulation resistance detection and potential balance detection are performed.

[0057] The embodiment of the present application provides a detection system for new energy vehicle detection, including using the above-mentioned test equipment for detection, such as using charging safety inspection equipment, automobile chassis dynamometer, OBD reading equipment and electrical safety inspection equipment, using the above-mentioned new energy vehicle operation safety performance detection, the charging safety inspection equipment is connected to the new energy vehicle signal to read the charging parameters, the automobile chassis dynamometer is used to carry the new energy vehicle to use discharge, the OBD reading equipment is connected to the new energy vehicle signal to read the discharge parameters, and the electrical safety inspection equipment is connected to the new energy vehicle charging socket and / or the conductive part of the body to read the parameters. Preferably, the detection items of the detection system include electrical safety detection, charging safety detection, power battery safety detection, drive motor safety detection and electronic control system safety detection.

[0058] like Figure 1 As shown in the figure, the new energy vehicle operation safety performance test items are schematically shown, including power battery safety test, drive motor safety test, electronic control system safety test and electrical safety test.

[0059] The power battery safety test includes charging process test and discharging process test. The charging process test is to detect the parameters of the power battery maximum temperature, single battery maximum voltage, single battery voltage range and BMS total voltage indication accuracy when the power battery is charged through charging safety inspection equipment. The discharge process test is to place the new energy vehicle on the chassis dynamometer for use and discharge through the OBD reading device to detect the parameters of the power battery maximum temperature and single battery minimum voltage. The drive motor safety test and the electronic control system safety test are both to place the new energy vehicle on the chassis dynamometer for use and discharge through the OBD reading device for detection. The drive motor safety test includes the parameters of detecting the drive motor temperature and the motor controller temperature. The electronic control system safety test includes the parameters of detecting the DC / DC converter temperature. The electrical safety test is to detect the parameters of the insulation resistance and potential equalization of the charging socket through the electrical safety inspection equipment. After the test, the parameters are collected and a test report is generated.

[0060] The testing equipment proposed in this application is to realize the testing of the operating safety performance of new energy vehicles. On the basis of testing new energy vehicles according to the traditional testing standard GB38900-2020 "Motor Vehicle Safety Technical Inspection Items and Methods", charging safety inspection equipment, vehicle chassis dynamometer, OBD reading equipment and electrical safety inspection equipment are used to test the power battery safety, drive motor safety, electronic control system safety and electrical safety of new energy vehicles. It can carry out more comprehensive and detailed testing of the operating safety of new energy vehicles, with high testing efficiency, and complete testing items and testing indicators, which can more comprehensively reflect the static and dynamic conditions of new energy vehicles, thereby ensuring the operating safety of new energy vehicles. More specifically, the interface standard of the charging safety inspection equipment used in the present invention complies with the relevant requirements of GB / T 18487.1, and the communication transmission protocol complies with the relevant requirements of GB / T 27930, and the automatic recording and transmission of the detection parameters can be realized; the OBD reading device is connected to the new energy vehicle via Bluetooth or USB, and it can read the operating data of the vehicle power battery, drive motor, electronic control system, and other information, as well as fault data, through the OBD interface, and the communication protocol for reading the inspection data through the OBD interface complies with the following general requirements: the OBD reading device communicates with the ECU through the OBD interface, and the communication network adopts the standard protocol defined by the CAN bus system of ISO15765-4, communicates at a baud rate of 500kb / s, and the data information transmission adopts the format of sending the high byte first; for small and micro passenger cars, the chassis dynamometer of the vehicle complies with the requirements of the chassis dynamometer for medium and light vehicles in GB 3847, adopts a four-axis eight-roller combination, the front and rear wheelbases are adjustable, the adjustment range is not less than 1m, the speeds of each axis are synchronized, and the synchronization error is not more than 2km / h. For other vehicles, the chassis dynamometer of the vehicle complies with GB 3847 requirements for chassis dynamometers for light and heavy vehicles; the interface of electrical safety inspection equipment shall comply with the relevant requirements of GB / T 18487.1, and can realize automatic recording and transmission of detection parameters. It can use megohmmeter, milliohmmeter or automatic test equipment, where the megohmmeter range is ≥100MΩ, the accuracy is ≤±3%, and the resolution is not less than 0.1MΩ. The milliohmmeter measuring current is adjustable, the measuring current is ≥0.2A, the accuracy is ≤±3%, and the resolution is not less than 0.1MΩ.

[0061] The present application proposes a detection method for the above system, in which the connection end is connected to the charging end of the target vehicle (the vehicle to be charged / the connected vehicle).

[0062] Acquire parameter information of the target vehicle, wherein the parameter information at least includes information of voltage and current or information of voltage, current and leakage current,

[0063] The control module determines whether the target vehicle meets the charging requirements based on the acquired information. If so, it performs charging process detection and discharging process detection.

[0064] Or use the OBD module to connect to the target vehicle,

[0065] Acquire the target vehicle's signals to evaluate the status of the target vehicle's power battery, drive motor and electronic control, and generate a test report according to the preset model.

[0066] During the power battery safety test, the charging process test includes connecting the DC charging plug of the charging safety inspection equipment and the DC charging socket of the new energy vehicle to charge the vehicle, and the continuous charging time is not less than 180s. During the charging process, the maximum temperature of the power battery monitoring point, the maximum voltage of a single battery, the voltage range of a single battery (also called a cell) and the power battery charging voltage are read, and the maximum temperature, the maximum voltage of a single battery, the maximum voltage range of a single battery and the power battery charging voltage during the test are recorded. When the vehicle has alarm signals related to the power battery, electric drive system, electronic control system, and high-voltage insulation, the test is stopped, and the total voltage indication accuracy of the BMS is calculated by reading the charging voltage of the charging safety inspection equipment. The calculation formula is: μ U =(U1-U2) / U2×100%, where μ Uis the total voltage indication accuracy of BMS, U1 is the power battery charging voltage recorded by BMS, and U2 is the charging voltage of the charging safety inspection equipment. Based on the above, the following test parameters (values) are used as the qualified test standards: the voltage range of a single battery is ≤0.3V, the total voltage indication accuracy of BMS is 0±1%, when using ternary lithium batteries, the maximum temperature of the power battery is ≤60℃, and the maximum voltage of a single battery is ≤4.4V, when using lithium iron phosphate batteries, the maximum temperature of the power battery is ≤65℃, and the maximum voltage of a single battery is ≤3.7V. During the discharge process, the new energy vehicle is parked on the roller of the chassis dynamometer of the automobile, and the constant force control method is used for loading. The loading force is: F=0.3F1L / (R+r), where F is the loading force of the chassis dynamometer, F1 is the load of the vehicle drive shaft, L is the center distance of the roller, R is the tire radius, and r is the roller radius; the driving speed of the new energy vehicle is 40±2km / h, and the driving time is 300±10s. The discharge process detection includes reading the temperature of each temperature monitoring point of the power battery and the voltage of a single battery through the vehicle OBD interface, recording the highest temperature and the lowest voltage of a single battery during the test, and stopping the inspection when the vehicle has alarm signals related to the power battery, electric drive system, electronic control system, and high-voltage insulation. Based on the above, the following detection parameters (values) are used as the qualified inspection standards: when using ternary lithium batteries, the highest temperature of the power battery is ≤60℃, and the lowest voltage of a single battery is ≥1.8V; when using lithium iron phosphate batteries, the highest temperature of the power battery is ≤65℃, and the lowest voltage of a single battery is ≥1.5V; in addition, for those who cannot read data through the vehicle OBD interface, observe whether there is an alarm message on the vehicle dashboard, such as a high temperature alarm for the power battery, a low voltage alarm for the power battery, etc. During the power battery discharge safety inspection, the power battery capacity retention rate can also be read using an OBD reading device, and the power battery capacity retention rate ≥60% can be used as the qualified inspection standard.

[0067] During the drive motor safety test, that is, during the power battery discharge safety inspection, use the OBD reading device to read the drive motor temperature and motor controller temperature, and record the maximum temperature of the drive motor and motor controller during the test. Based on the above, the drive motor temperature ≤175℃ and the motor controller temperature ≤95℃ are used as the inspection pass standards; for those who cannot read data through the OBD interface, you can check whether the vehicle has alarm information such as drive motor temperature alarm and drive motor controller temperature alarm by observing the vehicle dashboard.

[0068] During the safety inspection of the electronic control system, that is, during the safety inspection of power battery discharge, use the OBD reading device to read the vehicle's DC / DC converter temperature and record the highest temperature of the DC / DC converter during the test. Based on the above, the DC / DC converter temperature ≤95°C is used as the inspection pass standard; for those who cannot read data through the OBD interface, you can check whether the vehicle has DC / DC converter temperature alarm, DC / DC converter status alarm and other alarm information by observing the vehicle dashboard.

[0069] In one embodiment, the electric control safety detection also includes detecting the insulation resistance of the charging socket and detecting the parameters of potential equalization. The detection of the insulation resistance of the charging socket includes detecting the insulation resistance of the DC charging socket and the insulation resistance of the AC charging socket.

[0070] Preferably, the method includes: disconnecting the vehicle from the power supply, ensuring that all electrical and electronic switches on the vehicle are in an inactive state, and for a DC charging socket, connecting two probes of a megohmmeter to the positive and negative terminals of the DC charging socket and the electrical platform in turn, respectively, and setting the detection voltage of the megohmmeter to be greater than the maximum charging voltage until the reading is stable (3-5s), reading the insulation resistance between DC+ and the electrical platform, and the insulation resistance between DC- and the electrical platform, and calculating the insulation resistance according to the formula: R i =R1R2 / (R1+R2), calculate the insulation resistance of the DC charging socket, where R i is the insulation resistance of the DC charging socket, R1 is the insulation resistance between DC+ and the electrical platform, and R2 is the insulation resistance between DC- and the electrical platform; for the AC charging socket, connect the two probes of the megohmmeter to the phase terminals (L1, L2, L3) of the AC charging socket and the electrical platform respectively. The detection voltage set by the megohmmeter should be greater than the maximum charging voltage until the reading stabilizes (3-5s). (If manually) read the insulation resistance between L1 and the electrical platform, the insulation resistance between L2 and the electrical platform, and the insulation resistance between L3 and the electrical platform, and calculate according to the formula: R j =R3R4R5 / (R3R4+R3R5+R4R5), calculate the insulation resistance of the AC charging socket, where R j is the insulation resistance of the AC charging socket, R3 is the insulation resistance between L1 and the electrical platform, R4 is the insulation resistance between L2 and the electrical platform; R5 is the insulation resistance between L3 and the electrical platform.

[0071] Preferably, the automatic measurement method of the insulation resistance of the charging socket is as follows: turn off the power of the vehicle, ensure that all power and electronic switches on the vehicle are in an inactive state, connect the DC charging detection probe of the electrical safety automatic test equipment to the DC charging socket of the vehicle, start the electrical safety automatic test equipment, and the detection voltage set by the electrical safety automatic test equipment should be greater than the maximum charging voltage of the vehicle until the reading is stable (3-5s), and display and record the insulation resistance R of the DC charging socket i ; Connect the AC charging detection probe of the electrical safety automatic test equipment to the vehicle's AC charging socket, start the electrical safety automatic test equipment, and the detection voltage set by the electrical safety automatic test equipment should be greater than the vehicle's maximum charging voltage until the reading is stable (3-5s), and display and record the insulation resistance R of the AC charging socket j . Based on the above, the insulation resistance of the DC charging socket is ≥100Ω / V, and the insulation resistance of the AC charging socket is ≥1Ω as the qualified test standard. For the detection of potential equalization, the manual measurement method is as follows: turn off the power of the vehicle to ensure that all electrical and electronic switches on the vehicle are in an inactive state. When measuring the potential equalization (between the electrical platform and the conductive shell), connect the two probes of the milliohmmeter to the PE of the AC charging socket (or DC charging socket) and the conductive part of the vehicle body (such as the vehicle door bolt), increase the test current so that the test current reaches at least 0.2A, and read the measurement results; when measuring the potential equalization (between the conductive shell and the conductive shell), connect the two probes of the milliohmmeter to the PE of the DC charging socket and the PE of the AC charging socket, increase the test current so that the test current reaches at least 0.2A, and read the measurement results. The automatic measurement method of potential equalization is as follows: turn off the power of the vehicle to ensure that all electrical and electronic switches on the vehicle are in an inactive state, connect the DC charging detection probe and AC charging detection probe of the electrical safety automatic test equipment to the DC and AC charging sockets of the vehicle respectively, connect the electrical platform probe to the conductive part of the frame, start the electrical safety automatic test equipment, output a test current of not less than 0.2A, and automatically measure the potential equalization item by item (including between the electrical platform and the conductive shell, and between the conductive shell and the conductive shell); based on the above, the potential equalization between the electrical platform and the conductive shell is ≤0.1Ω, and the potential equalization between the conductive shells is ≤0.2Ω as the qualified test standard.

[0072] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A test device for testing new energy vehicles, characterized in that: include: A charging safety detection device, the charging safety detection device comprising: A housing, wherein a control module and a data processing module are disposed in the housing, The housing is provided with a display module, an emergency switch and a main switch. At least one storage portion is provided on the shell, and the storage portion is used to place a connection end, and the connection end is connected to a control module through a cable, and the connection end is used to connect to a charging end of a vehicle to detect a connected vehicle.

2. The test device according to claim 1, characterized in that The charging safety detection device also includes a wireless module, and the control module is electrically connected to the wireless module to transmit the processed data to the background server.

3. The testing device according to claim 1, characterized in that The charging safety detection device also includes an electrical safety detection device, which includes a shell, in which a control board and a data processing module are arranged. At least one connecting part is provided on the shell, which is connected to the control board via a cable. The connecting part is used to connect to the charging terminal of the vehicle to detect the electrical insulation performance and potential equalization information of the connected vehicle.

4. The testing device according to claim 3, characterized in that The information acquired by the electrical safety detection device is fed back to the data processing module therein, and is transmitted to the remote server after being processed by the data processing module.

5. The testing device according to claim 3, characterized in that The electrical safety testing device includes a built-in metering module, The metering module calculates the insulation resistance information and potential information of the connected vehicles based on the information transmitted by the received data processing module to evaluate the insulation resistance and potential balance of the connected vehicles.

6. A detection system, characterized in that: The method comprises the test device and the OBD module as claimed in any one of claims 1 to 5, The OBD module is connected to the target vehicle via Bluetooth or USB to obtain information of the connected vehicle, the information at least including information of the power battery, the drive motor and the electronic control. The information obtained by the OBD module determines the status of the power battery, drive motor and electronic control of the connected vehicle.

7. A detection method, used in the detection system according to claim 6, characterized in that: The detection method comprises: Connect the connector to the charging terminal of the target vehicle. Acquire parameter information of the target vehicle, wherein the parameter information at least includes information of voltage and current or information of voltage, current and leakage current, The control module determines whether the target vehicle meets the charging requirements based on the acquired information, and if so, performs charging process detection and discharging process detection.

8. The detection method according to claim 7, characterized in that The charging process detection includes: The charging safety inspection equipment is used to detect the maximum temperature of the power battery during charging, the maximum voltage of a single battery, the voltage range of a single battery, and the accuracy of the total voltage indication of the BMS, and a test report is generated.

9. The detection method according to claim 7, characterized in that: The discharge process detection includes: Place the target vehicle at the preset position. The maximum temperature of the power battery and the minimum voltage of a single battery are detected by the OBD reading device. The insulation resistance and potential equalization parameters of the charging socket are tested by electrical safety testing equipment. The loading is carried out in a constant force control mode, and the loading force is expressed as: F = 0.3F1L / (R+r), Among them, F is the loading force of the vehicle chassis dynamometer, F1 is the vehicle drive shaft load, L is the roller center distance, R is the tire radius, and r is the roller radius; the target vehicle's driving speed is 40±2km / h, and the driving time is 300±10s. Generate a test report.

10. The detection method according to claim 9, characterized in that: The discharge process detection also includes: Use the OBD module to connect to the target vehicle, Based on the OBD reading device, read the drive motor temperature and motor controller temperature, and record the maximum drive motor temperature and motor controller temperature during the test, or Read the temperature of the DC / DC converter of the target vehicle and record the highest temperature of the DC / DC converter during the test. And generate a test report.

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