Device and method for measuring the insulation resistance of an electric vehicle, and vehicle

Abstract

The application provides a device and a method for quickly measuring the insulation resistance of an electric vehicle, and a vehicle, and relates to the technical field of electric vehicle testing. The device comprises a high-voltage connection terminal, a voltage acquisition unit and a data processing unit. One end of the high-voltage connection terminal is connected to a charging gun head of a direct-current charging port of a vehicle to be measured, and the other end is connected to the data processing unit. The high-voltage connection terminal is connected to the data processing unit through three branches. The first branch is connected in series with a first relay. The second branch is directly connected to the data processing unit. The third branch is connected in series with a second relay. The voltage acquisition unit is used for measuring the voltage between the high-voltage positive electrode and the vehicle body, the voltage between the high-voltage negative electrode and the vehicle body, the voltage between the high-voltage positive electrode and the vehicle body after a fixed resistor is connected between the high-voltage negative electrode and the vehicle body, and the voltage between the high-voltage negative electrode and the vehicle body. The data processing unit receives the data collected by the voltage acquisition unit and calculates the high-voltage insulation resistance value. The vehicle insulation resistance automatic testing tool device can improve the testing convenience and avoid the risk of electric shock.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric vehicles, and particularly relates to a device and a method for quickly measuring the insulation resistance of an electric vehicle. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] How to ensure high-voltage safety is a very important aspect in the use safety of electric vehicles. The high-voltage safety of the electric vehicle not only involves personal and property safety but also public safety. Therefore, professional design and sufficient verification should be performed on the high-voltage safety during the development of the electric vehicle to ensure the electrical safety of each vehicle in use.

[0004] As an attribute of the vehicle performance, the high-voltage insulation of the vehicle is an important indicator of the high-voltage safety. Specific requirements for ensuring the high-voltage safety performance are given in the GB18384 standard. The GB18384 standard gives a specific method for measuring the insulation resistance of the vehicle. The insulation resistance value of the vehicle is calculated by a mathematical formula. However, the method for measuring the insulation resistance of the vehicle in the GB18384 standard is not very convenient and efficient in actual operation, and there is a risk of personal safety.

[0005] In addition, although there are circuits or systems for measuring the high-voltage insulation of the vehicle in the prior art, the above measurement has limitations such as complex operation and high professional technical requirements. SUMMARY

[0006] To overcome the deficiencies of the prior art, the present application provides a device for quickly measuring the insulation resistance of an electric vehicle, which can improve the testing convenience, improve the work efficiency, and avoid the risk of electric shock.

[0007] To achieve the above object, one or more embodiments of the present application provide the following technical solutions:

[0008] In a first aspect, a device for quickly measuring the insulation resistance of an electric vehicle is disclosed, comprising:

[0009] a high-voltage connection terminal and a voltage acquisition unit;

[0010] One end of the high-voltage connection terminal is connected to a charging gun head of a direct current charging port of a vehicle to be measured, and the other end is connected to a data processing unit;

[0011] The high-voltage connection terminal is connected to the data processing unit through three branches. The first branch is connected in series with a first relay; the second branch is directly connected to the data processing unit; and the third branch is connected in series with a second relay.

[0012] The voltage acquisition unit is configured to measure the voltage between the high-voltage positive electrode and the vehicle body, and the voltage between the high-voltage negative electrode and the vehicle body after a fixed resistor is connected between the high-voltage negative electrode and the vehicle body.

[0013] The high-voltage insulation resistance value is calculated based on the data collected by the voltage acquisition unit.

[0014] As a further technical solution, the first relay and the second relay are respectively connected in series with the coil and the starting switch, and the series circuit is powered by a power supply.

[0015] As a further technical solution, a gear switch and a fixed resistor are connected in series between the third branch and the second branch; and the fixed resistor is connected between the high-voltage negative electrode and the vehicle body after the gear switch is opened.

[0016] As a further technical solution, the voltage acquisition unit is further connected with a display panel for displaying the vehicle insulation resistance and the REESS voltage of the electric vehicle; when the starting switch is opened, the vehicle high-voltage value is automatically displayed, and the voltage between the high-voltage positive electrode and the vehicle body and the voltage between the high-voltage negative electrode and the vehicle body are recorded at the same time.

[0017] In a second aspect, a method for quickly measuring the vehicle insulation resistance of an electric vehicle is disclosed, comprising:

[0018] The starting switch of the device is opened, and the voltage U1 between the high-voltage positive electrode and the vehicle body and the voltage U1' between the high-voltage negative electrode and the vehicle body are measured.

[0019] The gear switch is rotated, a fixed resistor R0 is connected between the high-voltage negative electrode and the vehicle body, and then the voltage U2 between the high-voltage positive electrode and the vehicle body and the voltage U2' between the high-voltage negative electrode and the vehicle body are automatically measured.

[0020] Based on the above measurement values, the vehicle insulation resistance is calculated using the vehicle insulation resistance calculation formula.

[0021] As a further technical solution, the vehicle insulation resistance is calculated using the vehicle insulation resistance calculation formula, specifically:

[0022]

[0023] where R is the vehicle insulation resistance, r is the internal resistance of the device, and the value of 1 / r can be ignored as 0. i

[0024] As a further technical solution, before the starting switch of the device is opened and the voltage is measured, it is ensured that the battery insulation resistance detection function of the measured vehicle is closed, and after the DC charging gun is connected, the high-voltage remains in the power-on state. ​

[0025] As a further technical solution, the whole vehicle insulation resistance is calculated by using the whole vehicle insulation resistance calculation formula, and then displayed through the device display screen.

[0026] As a further technical solution, after the device start switch and the gear switch are turned on, the measured data is stored.

[0027] In a third aspect, a vehicle is disclosed, which is connected to the device for quickly measuring the whole vehicle insulation resistance of an electric vehicle through a vehicle DC charging port, wherein the vehicle is connected to the high-voltage connection terminal through the vehicle DC charging port.

[0028] The above one or more technical solutions have the following beneficial effects:

[0029] The whole vehicle insulation resistance automatic test tooling device can improve the test convenience, improve the work efficiency, and avoid the risk of electric shock.

[0030] When obtaining the high-voltage insulation resistance value, the device high-voltage connection terminal is only connected to the vehicle DC charging port, and the device start switch and the gear switch are turned on, and then the high-voltage insulation resistance value of the electric vehicle can be quickly measured, avoiding the risk of human measurement.

[0031] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which form a part of this description, are included to provide further understanding of the application, and are incorporated in and constitute a part of this description. The illustrative embodiments of the application and their description serve to explain the application. They do not, however, limit the present application, nor do they express all of its features. Other embodiments of the application will become apparent from a review of the following description.

[0033] Figure 1 The high-voltage connection terminal structure of the embodiment of the present application is shown in the figure;

[0034] Figure 2 The display panel display interface of the embodiment of the present application is shown in the figure;

[0035] Figure 3 The circuit principle diagram of the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0037] It is to be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0038] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0039] Embodiment one

[0040] The embodiment discloses a device for quickly measuring the insulation resistance of an electric vehicle, which can improve test convenience, improve work efficiency and avoid the risk of electric shock of personnel.

[0041] In the embodiment, referring to FIG. 1, a device for quickly measuring the insulation resistance of an electric vehicle includes: Figures 1-3

[0042] The high-voltage connection terminal, the voltage acquisition unit, and the voltage sampling processor;

[0043] One end of the high-voltage connection terminal is connected to a charging gun head of a direct-current charging port of a vehicle to be measured, and the other end is connected to a data processing unit;

[0044] The high-voltage connection terminal is connected to the data processing unit through three branches, the first branch is connected in series with a first relay; the second branch is directly connected to the data processing unit; and the third branch is connected in series with a second relay;

[0045] The voltage acquisition unit is used to measure the voltage between the high-voltage positive electrode and the vehicle body and the voltage between the high-voltage negative electrode and the vehicle body, and the voltage between the high-voltage positive electrode and the vehicle body and the voltage between the high-voltage negative electrode and the vehicle body after a fixed resistor is connected between the high-voltage negative electrode and the vehicle body;

[0046] The high-voltage insulation resistance value is calculated based on the data collected by the voltage acquisition unit.

[0047] In the embodiment, when the gun head (i.e., the high-voltage connection terminal) is connected to the charging seat (i.e., the direct-current charging interface of the vehicle), first, the device switch is turned on, the device for quickly measuring the insulation resistance of the electric vehicle is automatically connected to the high voltage of the vehicle, the device displays the high-voltage value, and the voltage U1 between the high-voltage positive electrode and the vehicle body and the voltage U1' between the high-voltage negative electrode and the vehicle body are recorded at the same time; then, the device gear is rotated, a fixed resistor R0 is automatically connected between the high-voltage negative electrode and the vehicle body, the voltage U2 between the high-voltage positive electrode and the vehicle body and the voltage U2' between the high-voltage negative electrode and the vehicle body are recorded at the same time, and the device data processing unit CPU automatically calculates the insulation resistance Ri of the vehicle according to the software program formula set in advance and automatically displays the result on the device. The technical scheme of the embodiment is suitable for various applications, simple to operate, high in test efficiency, and the test result can be visually displayed.

[0048] ​Please refer to the attached drawings Figure 1 The high-voltage connection terminal is connected to a device for measuring the insulation resistance of the whole vehicle and a charging gun head of the DC charging port of the vehicle.

[0049] The high-voltage connection terminal is a standard part and has good versatility, and no special requirements are needed in structure.

[0050] The display panel can be a liquid crystal display panel, and the REESS (chargeable energy storage system) voltage and the insulation resistance Ri of the whole vehicle of the electric vehicle are displayed, as shown in the attached Figure 2 The chargeable energy storage system is a vehicle-mounted power battery, i.e., a high-voltage battery, and the voltage value thereof needs to be measured.

[0051] Regarding the gear switch S2, the rotary switch, after being turned on, automatically connects the fixed resistor R0 between the high-voltage negative electrode and the vehicle body, as shown in the attached Figure 2

[0052] Regarding the device start switch S1, after being turned on when the high-voltage connection terminal is connected to the DC charging port of the vehicle, the device automatically displays the high-voltage value of the vehicle, and simultaneously records the voltage U1 between the high-voltage positive electrode and the vehicle body and the voltage U1' between the high-voltage negative electrode and the vehicle body, as shown in the attached Figure 2

[0053] In the embodiment, the coils corresponding to the first relay and the second relay and the start switch are connected in series, and the series circuit is powered by a power supply.

[0054] The first relay and the second relay are used to control the on-off of the high voltage, so as to achieve the purpose of collecting the high-voltage signal.

[0055] In the embodiment, the gear switch and the fixed resistor connected in series are connected in parallel between the third branch and the second branch; after the gear switch is turned on, the fixed resistor is connected between the high-voltage negative electrode and the vehicle body.

[0056] It should be noted that according to the test method in GB18384 standard, a fixed resistor needs to be connected in parallel, and therefore, in the embodiment, the insulation resistance value of the vehicle is calculated according to the size of the voltage division value.

[0057] In the embodiment, the data processing unit is further connected to a display panel, which is used to display the insulation resistance of the whole vehicle and the REESS voltage of the electric vehicle; when the start switch is turned on, the high-voltage value of the vehicle is automatically displayed, and the voltage between the high-voltage positive electrode and the vehicle body and the voltage between the high-voltage negative electrode and the vehicle body are simultaneously recorded.

[0058] Embodiment Two

[0059] The purpose of the embodiment is to provide a method for quickly measuring the insulation resistance of the whole vehicle of an electric vehicle, which comprises the following steps: ​​

[0060] Turning on the device start switch, measuring the voltage U1 between the high voltage positive pole and the vehicle body, and the voltage U1' between the high voltage negative pole and the vehicle body;

[0061] Turning on the gear switch, connecting a fixed resistance R0 between the high voltage negative pole and the vehicle body, and then automatically measuring the voltage U2 between the high voltage positive pole and the vehicle body, and the voltage U2' between the high voltage negative pole and the vehicle body;

[0062] Based on the above measurement values, the whole vehicle insulation resistance is calculated by using the whole vehicle insulation resistance calculation formula.

[0063] In this embodiment, before turning on the device start switch to measure the voltage, it is ensured that the battery insulation resistance detection function of the measured vehicle is closed, and after connecting the DC charging gun, the high voltage remains in the power-on state.

[0064] In this embodiment, after calculating the whole vehicle insulation resistance by using the whole vehicle insulation resistance calculation formula, the result is displayed through the device display screen.

[0065] In this embodiment, after turning on the device start switch and the gear switch, the measured data is stored.

[0066] More specifically, the steps are as follows:

[0067] Step 1: Ensure that the battery insulation resistance detection function of the measured vehicle is closed, and after connecting the DC charging gun, the high voltage remains in the power-on state;

[0068] The reason for performing the above step 1 is that after the insulation resistance detection function is turned on, the parallel fixed resistance will cause the vehicle insulation alarm, and the vehicle will automatically disconnect the high voltage, which will cause the test to be unable to proceed; the vehicle control logic stipulates that all high voltage components except the battery are powered off in the vehicle gun state (i.e. charging mode), which does not meet the requirements of the whole vehicle insulation resistance measurement.

[0069] The above step method can realize easy operation, strong implementability, and ensure the normal development of the test.

[0070] Step 2: Connect the device high voltage connection terminal to the vehicle DC charging port;

[0071] Step 3: Turn on the device start switch, record the vehicle high voltage value. At the same time, the device automatically measures the voltage U1 between the high voltage positive pole and the vehicle body, and the voltage U1' between the high voltage negative pole and the vehicle body, and stores the data in the data processing unit;

[0072] Recording the vehicle high voltage value is used to meet the requirement of the whole vehicle insulation resistance measurement formula in the standard GB18384.

[0073] The device automatically measures the voltage U1 between the high-voltage positive electrode and the vehicle body and the voltage U1' between the high-voltage negative electrode and the vehicle body, specifically after the S1 switch is closed and the high voltage is turned on, the voltage acquisition unit automatically acquires the voltage value.

[0074] Step 4: Rotate the gear switch, the device automatically connects a fixed resistance R0 between the high-voltage negative electrode and the vehicle body, then automatically measures the voltage U2 between the high-voltage positive electrode and the vehicle body and the voltage U2' between the high-voltage negative electrode and the vehicle body, and stores the data in the data processing unit.

[0075] The above-mentioned fixed resistance R0 is a standard component with a fixed value, which can also be calibrated and measured.

[0076] Step 5: After the device data processing unit calculates the whole vehicle insulation resistance Ri according to the whole vehicle insulation resistance calculation formula, the whole vehicle insulation resistance Ri is displayed on the device display screen. Wherein r is the internal resistance of the device, the numerator is 1, and the denominator is infinity, so the value of 1 / r can be ignored as 0.

[0077]

[0078] The above-mentioned way can realize the testing of the high-voltage insulation resistance value of a vehicle, the whole process is fast, simple and safe to operate, and the efficiency of the whole vehicle insulation resistance test is improved.

[0079] Embodiment Three

[0080] The purpose of the embodiment is to provide a vehicle, which can be an electric vehicle, connected to the device for quickly measuring the whole vehicle insulation resistance of the electric vehicle in the first embodiment through the vehicle DC charging port, wherein the vehicle is connected to the high-voltage connection terminal through the vehicle DC charging port.

[0081] Although the specific embodiments of the present application have been described above with reference to the accompanying drawings, the description is not a limitation on the scope of protection of the present application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the scope of protection of the present application.

Claims

1. A device for rapidly measuring the insulation resistance of an electric vehicle, characterized in that, include: High-voltage connection terminals and voltage acquisition unit; One end of the high-voltage connection terminal is connected to the charging gun head of the DC charging port of the vehicle under test, and the other end is connected to the data processing unit. The high-voltage connection terminal is connected to the data processing unit through three branches: the first branch is connected in series with the first relay; the second branch is directly connected to the data processing unit; and the third branch is connected in series with the second relay. A gear switch and a fixed resistor are connected in parallel between the third branch and the second branch; after the gear switch is turned on, a fixed resistor is connected in parallel between the high voltage negative terminal and the vehicle body. The voltage acquisition unit is used to measure the voltage between the vehicle's high voltage positive and negative terminals and the vehicle body, respectively, and the voltage between the vehicle's high voltage positive and negative terminals and the vehicle body after a fixed resistor is connected between the high voltage negative terminal and the vehicle body. The high-voltage insulation resistance value is calculated based on the data acquired by the voltage acquisition unit; To obtain the high-voltage insulation resistance value, simply connect the high-voltage connection terminal of the device to the vehicle's DC charging port, turn on the device's start switch, and rotate the gear switch to quickly measure the high-voltage insulation resistance value of the electric vehicle.

2. The device for rapidly measuring the insulation resistance of an electric vehicle as described in claim 1, characterized in that, The coils corresponding to the first relay and the second relay, as well as the start switch, are connected in series, and the series circuit is powered by a power source.

3. The device for rapidly measuring the insulation resistance of an electric vehicle as described in claim 1, characterized in that, The voltage acquisition unit is also connected to a display panel for displaying the vehicle insulation resistance and the electric vehicle REESS voltage. When the start switch is turned on, it automatically displays the vehicle high voltage value and simultaneously records the voltage between the high voltage positive terminal and the vehicle body and the voltage between the high voltage negative terminal and the vehicle body.

4. A method for rapidly measuring the insulation resistance of an electric vehicle, utilizing the apparatus for rapidly measuring the insulation resistance of an electric vehicle as described in any one of claims 1-3, characterized in that, include: Turn on the device start switch and measure the voltage U1 between the high voltage positive terminal and the vehicle body, and the voltage U1' between the high voltage negative terminal and the vehicle body; Rotate the gear switch, connect a fixed resistor R0 between the high voltage negative terminal and the vehicle body, and then automatically measure the voltage U2 between the high voltage positive terminal and the vehicle body, and the voltage U2' between the high voltage negative terminal and the vehicle body; Based on the above measurements, the insulation resistance of the whole vehicle is calculated using the formula for calculating the insulation resistance of the whole vehicle.

5. The method for rapidly measuring the insulation resistance of an electric vehicle as described in claim 4, characterized in that, The insulation resistance of the entire vehicle is calculated using the formula for calculating the insulation resistance of the entire vehicle, specifically as follows: Among them, R i R is the insulation resistance of the entire vehicle, r is the internal resistance of the device, and the value of 1 / r can be ignored as 0.

6. The method for rapidly measuring the insulation resistance of an electric vehicle as described in claim 4, characterized in that, Before turning on the device and measuring the voltage, ensure that the battery insulation resistance detection function of the vehicle under test is turned off, and that the high voltage is kept on after the DC charging gun is connected.

7. The method for rapidly measuring the insulation resistance of an electric vehicle as described in claim 4, characterized in that, The insulation resistance of the entire vehicle is calculated using the formula for calculating the insulation resistance of the entire vehicle, and then displayed on the equipment's screen.

8. The method for rapidly measuring the insulation resistance of an electric vehicle as described in claim 4, characterized in that, After turning on the device and rotating the gear switch, the measured data is stored.

9. A vehicle characterized in that, The vehicle is connected to the device for rapidly measuring the insulation resistance of an electric vehicle as described in any one of claims 1-3 via a vehicle DC charging port, wherein the vehicle is connected to a high-voltage connection terminal via the vehicle DC charging port.

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