A calibration device and method for the terminal of a new energy vehicle safety testing system

Abstract

The present application is applicable to the field of automobile safety technology testing and provides a calibration device and method for the end of a new energy vehicle safety testing system. The device includes: an insulation resistance calibration terminal, a potential equalization calibration terminal, an AC / DC charging socket, and an AC / DC charging socket wiring harness lead-out terminal; an insulation resistance calibration terminal for calibrating the insulation resistance of the DC charging socket channel and the insulation resistance of the AC charging socket channel of the safety testing system; a potential equalization calibration terminal for calibrating the potential equalization of each channel of the safety system; an AC / DC charging socket for connecting to the AC / DC charging gun of the safety testing system to be calibrated; and an AC / DC charging socket wiring harness lead-out terminal, which is internally connected to the effective terminal of the AC / DC charging socket and externally located on a wiring panel for connection to the insulation resistance calibration terminal when calibrating the end of the AC / DC charging socket channel of the safety testing system. The present application can improve the accuracy of the test parameters at the end of the system.

Description

Technical Field

[0001] The present application relates to the field of automobile safety technology testing, and in particular to a calibration device and method for the terminal of a new energy vehicle safety testing system. Background Art

[0002] As the voltage platform of new energy vehicles continues to rise, the voltage resistance requirements of electronic components, the effective connection between exposed conductive parts and the electrical platform, and the insulation protection of conductive parts within the vehicle directly impact the safety of vehicle occupants. Therefore, safety regulations such as insulation resistance and potential equalization have become mandatory inspection items for new energy electric vehicles. Traditional safety testing equipment often provides independent testing functions on a standalone basis. In recent years, some domestic manufacturers have integrated the functions of such equipment to combine multiple testing items into a single system, creating safety testing systems for use by automobile manufacturers.

[0003] Currently, the calibration and adjustment of safety testing systems are all performed using a single safety device. After the system is assembled, regular calibration and adjustment require disassembly or calibration using an independent / dedicated wiring harness on the rear panel of the single device. This calibration method only ensures the accuracy of the corresponding parameters at the safety device port. Once installed within the system, especially when the system contains a charging gun wiring harness corresponding to the vehicle being tested, the measurement data at the system end will have certain errors and cannot accurately reflect the actual performance of the vehicle being tested. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the embodiment of the present application provides a calibration device and method for the terminal of a new energy vehicle safety detection system, which can improve the accuracy of the test parameters of the system terminal.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a calibration device for a terminal of a new energy vehicle safety testing system, comprising: an insulation resistance calibration terminal, a potential equalization calibration terminal, a DC charging socket, a DC charging socket wiring harness lead-out terminal, an AC charging socket, and an AC charging socket wiring harness lead-out terminal;

[0007] The insulation resistance calibration terminal is used to calibrate the first resistance of the DC charging socket channel and the third resistance of the AC charging socket channel of the safety testing system; the DC charging socket channel is formed by the host of the safety testing system to the end of the DC charging gun; the AC charging socket channel is formed by the host of the safety testing system to the end of the AC charging gun;

[0008] The potential equalization calibration terminal is used to calibrate the fifth resistor of the potential equalization channel of the safety testing system; the potential equalization channel is formed by the host of the safety testing system to the potential equalization terminal on the host;

[0009] The DC charging socket is used to connect to the DC charging gun of the safety testing system and has a built-in DC charging gun socket connection confirmation device; the DC charging socket wiring harness lead-out terminal is internally connected to the effective terminal of the DC charging socket and externally located on the wiring panel, and is used to connect to the insulation resistance calibration terminal when calibrating the first resistance of the DC charging socket channel of the safety testing system;

[0010] The AC charging socket is used to connect to the AC charging gun of the safety testing system and has a built-in AC charging gun socket connection confirmation device; the AC charging socket wiring harness lead-out end is internally connected to the effective terminal of the AC charging socket and externally placed on the wiring panel; it is used to be connected to the insulation resistance calibration terminal when calibrating the third resistance of the AC charging socket channel of the safety testing system.

[0011] In one possible implementation, the insulation resistance calibration terminal is a lead-out terminal of an insulation resistor having a preset standard resistance value, and the lead-out terminal of the insulation resistor is formed by extending a wire from each end of the insulation resistor to the wiring panel; the insulation resistance calibration terminal has multiple terminals;

[0012] The potential equalization calibration terminal is the lead-out terminal of a potential equalization resistor with a preset standard resistance value inside. The lead-out terminal of the potential equalization resistor is two wires extending from each end of the potential equalization resistor to the wiring panel; the potential equalization calibration terminal has multiple terminals.

[0013] In a possible implementation, the safety testing system terminal calibration device further includes a voltmeter and an ammeter;

[0014] The voltmeter is used to detect the terminal voltage of the DC charging gun of the safety testing system when calibrating the first resistance of the DC charging socket channel of the safety testing system, and to detect the terminal voltage of the AC charging gun of the safety testing system when calibrating the third resistance of the AC charging socket channel of the safety testing system;

[0015] The ammeter is used to detect the output current of the potential equalization terminal of the safety detection system when calibrating the fifth resistor of the potential equalization channel of the safety detection system.

[0016] In one possible implementation, the device further includes a device housing, which is used to integrate the insulation resistance calibration terminal, the potential equalization calibration terminal, the AC charging socket, the AC charging socket wiring harness lead-out terminal, the DC charging socket, and the DC charging socket wiring harness lead-out terminal on the wiring panel.

[0017] In a second aspect, an embodiment of the present application provides a calibration method for a terminal of a new energy vehicle safety testing system, comprising: calibrating a first resistance of a DC charging socket channel of the safety testing system using a DC charging socket, a DC charging socket wiring harness lead-out terminal, and an insulation resistance calibration terminal;

[0018] Calibrate the third resistance of the AC charging socket channel of the safety testing system using the AC charging socket, the AC charging socket wiring harness lead-out terminal, and the insulation resistance calibration terminal;

[0019] The fifth resistor of the potential equalization channel of the safety detection system is calibrated using the potential equalization calibration terminal and the potential equalization resistor.

[0020] In one possible implementation, calibrating the first resistance of the DC charging socket channel of the safety testing system using the DC charging socket, the DC charging socket wiring harness lead-out terminal, and the insulation resistance calibration terminal includes:

[0021] Connecting a DC charging gun of a safety testing system to the DC charging socket, connecting the wiring harness lead-out end of the DC charging socket to two ends of a voltmeter using a wire, obtaining relevant voltage parameter values ​​of a first debugging point and a second debugging point, and determining a DC voltage calibration coefficient of the safety testing system based on the relevant voltage parameter values ​​of the first debugging point and the relevant voltage parameter values ​​of the second debugging point, and calibrating the DC voltage of the safety testing system based on the DC voltage calibration coefficient; the first debugging point and the second debugging point are voltage debugging points in a first preset voltage segment;

[0022] After calibrating the DC voltage of the safety testing system, disconnecting the DC charging socket harness lead-out terminal from the harness at both ends of the voltmeter, connecting the DC socket harness lead-out terminal to the first terminal of the insulation resistance calibration terminal, and obtaining a first resistance value measured by the safety testing system when the voltage value measured by the safety testing system is a first target voltage value;

[0023] Connecting a wire from the DC socket harness lead-out terminal to the second terminal of the insulation resistance calibration terminal, obtaining a second resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the first target voltage value; the insulation resistance values ​​corresponding to the first terminal and the insulation resistance values ​​corresponding to the second terminal are within a first preset resistance range;

[0024] Determining a DC current calibration coefficient of the safety testing system based on the first target voltage value, the first resistance value, the second resistance value, the insulation resistance corresponding to the first wiring terminal, and the insulation resistance corresponding to the second wiring terminal;

[0025] Obtain a sampled current of a DC charging socket channel of the safety testing system when the voltage value measured by the safety testing system is the first target voltage value, and calibrate a first resistance of the DC charging socket channel of the safety testing system based on the sampled current of the DC charging socket channel, the first target voltage value, and the DC current calibration coefficient.

[0026] In a possible implementation, the voltage parameter values ​​related to the first debugging point include the voltage measurement value x1 of the safety detection system corresponding to the first debugging point and the voltage measurement value y1 of the calibration device corresponding to the first debugging point; the voltage parameter values ​​related to the second debugging point include the voltage measurement value x2 of the safety detection system corresponding to the second debugging point and the voltage measurement value y2 of the calibration device corresponding to the second debugging point; the voltage calibration coefficient includes the voltage slope coefficient k u and voltage offset coefficient b u ;

[0027] The calculation formula of the voltage calibration coefficient includes:

[0028]

[0029]

[0030] The current calibration coefficient includes the current slope coefficient k a and current offset coefficient b a The calculation formula of the current calibration coefficient includes:

[0031]

[0032]

[0033] Wherein, U is the first target voltage value, R1 is the first resistance value, R2 is the second resistance value, R1′ is the insulation resistance value corresponding to the first terminal, and R2′ is the insulation resistance value corresponding to the second terminal;

[0034] The sampling current I of the DC charging socket channel a The calculation formula includes:

[0035]

[0036] Among them, R i is the internal standard shunt resistance of the safety detection system, U x is the sampling voltage of the x-th sampling point at both ends of the insulation resistance channel shunt of the safety testing system, and t is the test time;

[0037] The resistance value R after calibration of the first resistor of the DC charging socket channel of the safety detection system a for:

[0038]

[0039] In one possible implementation, calibrating the third resistance of the AC charging socket channel of the safety testing system using the AC charging socket, the AC charging socket wiring harness lead-out terminal, and the insulation resistance calibration terminal includes:

[0040] Connecting an AC charging gun of a safety testing system to the AC charging socket, connecting the wiring harness lead-out end of the AC charging socket to two ends of a voltmeter using a wire, obtaining relevant voltage parameter values ​​of a third debugging point and relevant voltage parameter values ​​of a fourth debugging point, and determining an AC voltage calibration coefficient of the safety testing system based on the relevant voltage parameter values ​​of the third debugging point and the relevant voltage parameter values ​​of the fourth debugging point, and calibrating the AC voltage of the safety testing system based on the AC voltage calibration coefficient; the third debugging point and the fourth debugging point are voltage debugging points in a second preset voltage segment;

[0041] After calibrating the AC voltage of the safety testing system, disconnecting the AC charging socket harness lead-out terminal from the harness at both ends of the voltmeter, connecting the AC socket harness lead-out terminal to the third terminal of the insulation resistance calibration terminal, and obtaining a third resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the second target voltage value;

[0042] Connecting a wire from the AC socket harness lead-out terminal to the fourth terminal of the insulation resistance calibration terminal, obtaining a fourth resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the second target voltage value; the insulation resistance value corresponding to the third terminal and the insulation resistance value corresponding to the fourth terminal are within a second preset resistance segment;

[0043] Determining an AC current calibration coefficient of the safety testing system based on the second target voltage value, the third resistance value, the fourth resistance value, the insulation resistance corresponding to the third terminal, and the insulation resistance corresponding to the fourth terminal;

[0044] Obtain a sampled current of the AC charging socket channel of the safety testing system when the voltage value measured by the safety testing system is the second target voltage value, and calibrate the third resistance of the AC charging socket channel of the safety testing system based on the sampled current of the AC charging socket channel, the second target voltage value, and the AC current calibration coefficient.

[0045] In a possible implementation, calibrating the fifth resistor of the potential equalization channel of the safety detection system by using the potential equalization calibration terminal and the potential equalization resistor includes:

[0046] Connecting the two potential equalization terminals of the safety testing system to the two terminals of an ammeter, obtaining relevant current parameter values ​​of a fifth debugging point and a sixth debugging point, and obtaining a calibration coefficient of the current of the potential equalization channel of the safety testing system based on the relevant current parameter values ​​of the fifth debugging point and the relevant current parameter values ​​of the sixth debugging point; calibrating the current of the potential equalization channel of the safety testing system based on the calibration coefficient of the current of the potential equalization channel; the fifth debugging point and the sixth debugging point are current debugging points in a preset current segment;

[0047] After calibrating the current of the potential equalization channel of the safety testing system, disconnecting the two potential equalization terminals of the safety testing system from the ammeter, connecting the two potential equalization terminals of the safety testing system to the fifth terminal of the potential equalization calibration terminal, and obtaining a first sampled voltage measured by the safety testing system when the current value measured by the safety testing system is the target current value;

[0048] Calculating a fifth resistance value of the safety detection system based on the target current value and the first sampling voltage;

[0049] Connecting the two potential equalization terminals of the safety testing system to the sixth terminal of the potential equalization calibration terminal, and obtaining a second sampled voltage measured by the safety testing system when the current value measured by the safety testing system is the target current value;

[0050] calculating a sixth resistance value of the safety detection system based on the target current value and the second sampling voltage; the resistance value of the potential equalization resistor corresponding to the fifth terminal and the resistance value of the potential equalization resistor corresponding to the sixth terminal are within a third preset resistance segment;

[0051] determining a calibration coefficient of a fifth resistor of a potential equalization channel of the safety testing system based on the fifth resistance value, the sixth resistance value, the resistance value of the potential equalization resistor corresponding to the fifth terminal, and the resistance value of the potential equalization resistor corresponding to the sixth terminal;

[0052] The fifth resistor of the potential equalization channel of the safety testing system is calibrated based on the calibration coefficient of the fifth resistor of the potential equalization resistance.

[0053] In a possible implementation, the first sampling voltage includes sampling voltages of multiple sampling points; the fifth resistance value R of the safety detection system b The calculation formula includes:

[0054]

[0055] Among them, I b is the target constant current value, U b is the sampling voltage of the x-th sampling point, and t is the test time;

[0056] The fifth resistance is R b , the sixth resistor value is R c The resistance of the potential equalization resistor corresponding to the first terminal of the potential equalization calibration terminal is R b The resistance of the potential equalization resistor corresponding to the second terminal of the potential equalization calibration terminal is R c '; The calibration coefficient of the fifth resistor of the potential equalization channel of the safety detection system includes the slope coefficient k of the resistor r and the offset coefficient b of the resistor r ;

[0057] The calculation formula for the calibration coefficient of the fifth resistor of the potential equalization channel of the safety detection system includes:

[0058]

[0059]

[0060] Among them, R c is the sixth resistance value, R b ' is the resistance of the potential equalization resistor corresponding to the fifth terminal, R c ' is the resistance of the potential equalization resistor corresponding to the sixth terminal.

[0061] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0062] In the embodiment of the present application, the safety detection system containing the charging gun line is calibrated through the cooperation of the insulation resistance calibration terminal, the potential equalization calibration terminal, the DC charging socket and the AC charging socket, thereby reducing the error caused by the extension of the charging gun line and improving the accuracy of the system terminal test parameters.

[0063] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0065] Figure 1 This is a structural diagram of a calibration device at the end of a new energy vehicle safety testing system provided by an embodiment of the present application;

[0066] Figure 2 This is a schematic diagram of an application scenario of a calibration method for a terminal of a new energy vehicle safety testing system provided in one embodiment of the present application;

[0067] Figure 3 This is a schematic diagram of the calculation principle of the sampling current parameters for insulation resistance testing provided by an embodiment of the present application;

[0068] Figure 4 2 is a schematic diagram of a potential equalization test calibration provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0070] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0071] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0072] It should also be understood that the term "relative" as used in this specification and the appended claims refers to relative positions in mechanical movement.

[0073] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0074] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0075] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0076] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0077] Figure 1 This is a schematic diagram of the appearance of a calibration device for the terminal of a new energy vehicle safety and regulations testing system. The calibration method for the terminal of a new energy vehicle safety and regulations testing system of the present invention is implemented based on this device.

[0078] In one embodiment, referring to Figure 1 A calibration device at the end of a new energy vehicle safety testing system is characterized by including: a device housing 1, an insulation resistance calibration terminal 2, a potential equalization calibration terminal 3, a DC charging socket wiring harness lead-out terminal 4, a voltmeter 5, a DC charging socket 6, an AC charging socket wiring harness lead-out terminal 7, an ammeter 8, an AC charging socket 9, a voltmeter terminal 10, and an ammeter terminal 11.

[0079] Insulation resistance calibration terminal 2 is used to calibrate the first resistance of the DC charging socket channel and the third resistance of the AC charging socket channel of the safety testing system; the DC charging socket channel is formed by the main unit of the safety testing system to the end of the DC charging gun; the AC charging socket channel is formed by the main unit of the safety testing system to the end of the AC charging gun.

[0080] The potential equalization calibration terminal 3 is used to calibrate the fifth resistor of the potential equalization channel of the safety detection system; the potential equalization channel is formed by the potential equalization terminals on the host to the host of the safety detection system; the DC charging socket 6 is used to connect the DC charging gun of the safety detection system, and has a built-in DC charging gun socket connection confirmation device.

[0081] For example, when testing the insulation or potential equalization performance of a vehicle under test, if the safety testing system includes a charging gun wiring harness corresponding to the vehicle under test, the measured data at the system end may have certain errors due to the combination of the safety testing system's main unit and the charging gun wiring, namely, the extension of the wiring harness, and may not accurately reflect the actual performance of the vehicle under test. This is manifested in that when the safety testing system is used to test a standard resistor of a known value, the value displayed by the safety testing system may differ from the actual resistance of the standard resistor. Therefore, the present invention requires calibrating the resistance value measured by the safety testing system to the actual resistance value of the standard resistor. The first resistor of the DC charging socket channel, the third resistor of the AC charging socket channel, and the fifth resistor of the potential equalization channel are all values ​​displayed by the safety testing system. Calibrating the first resistor of the DC charging socket channel, the third resistor of the AC charging socket channel, and the fifth resistor of the potential equalization channel involves calibrating the first, third, and fifth resistors displayed on the safety testing system to their corresponding standard resistance values.

[0082] The DC charging socket harness lead-out terminal 4 is internally connected to the effective terminal of the DC charging socket 6 and is externally placed on the wiring panel. It is used to connect to the insulation resistance calibration terminal 2 when calibrating the first resistance of the DC charging socket channel of the safety testing system.

[0083] The AC charging socket 9 is used to connect to the AC charging gun of the safety testing system and has a built-in AC charging gun socket connection confirmation device; the AC charging socket wiring harness lead-out terminal 7 is internally connected to the effective terminal of the AC charging socket 9 and is externally placed on the wiring panel; it is used to connect to the insulation resistance calibration terminal 2 when calibrating the third resistance of the AC charging socket channel of the safety testing system.

[0084] For example, the DC charging socket 6 and the AC charging socket 9 of the calibration device are used to simulate the vehicle end under test and can be used as standard objects during calibration; the effective terminals of the DC charging socket 6 and the effective terminals of the AC charging socket 9 are led out from the inside of the calibration device to the wiring panel to form the DC charging socket wiring harness lead-out terminal 4 and the AC charging socket wiring harness lead-out terminal 7.

[0085] The DC charging gun has a built-in DC charging gun connection confirmation resistor, which matches the DC charging gun socket connection confirmation device and is used to verify the connection confirmation function between the DC charging gun and the DC charging gun socket or the DC charging socket 6; the AC charging gun has a built-in AC charging gun connection confirmation device, which matches the AC charging gun socket connection confirmation device and is used to verify the connection confirmation function between the AC charging gun and the AC charging gun socket or the AC charging socket 9.

[0086] Specifically, the insulation resistance calibration terminal 2 is the lead-out terminal of the insulation resistor with a preset standard resistance value inside, and the lead-out terminal of the insulation resistor is formed by leading a wire from each end of the insulation resistor to the wiring panel; the insulation resistance calibration terminal 2 has multiple terminals; the potential equalization calibration terminal 3 is the lead-out terminal of the potential equalization resistor with a preset standard resistance value inside, and the lead-out terminal of the potential equalization resistor is formed by leading two wires from each end of the potential equalization resistor to the wiring panel; the potential equalization calibration terminal 3 has multiple terminals.

[0087] Exemplarily, the insulation resistor of a preset standard resistance value connected to the insulation resistance calibration terminal 2 is used to simulate the insulation resistance of the vehicle's high-voltage component casing and the electrical platform; the two ends of each group of insulation resistors are brought out to the wiring panel as a group of insulation resistance calibration terminals 2; there are multiple groups of insulation resistance calibration terminals 2, each corresponding to an insulation resistor of different resistance values.

[0088] Exemplarily, a potential equalization resistor with a preset standard resistance value connected to the potential equalization calibration terminal 3 is used to simulate the conductivity between the vehicle shells; the two ends of each potential equalization resistor are led out to the wiring panel as a group of potential equalization calibration terminals 3, and one end of each of the above potential equalization resistors leads to two binding posts and the other end leads to two binding posts; there are multiple groups of potential equalization calibration terminals 3, each corresponding to a potential equalization resistor with a different resistance value.

[0089] For example, the built-in multiple sets of insulation resistors are high-precision, high-value resistors, and the built-in multiple sets of potential equalization resistors are high-precision, low-value resistors. The standard insulation resistance range is 10k ohms to 1.2G ohms at multiple points, with an accuracy of 0.5% to 1%; the standard potential equalization resistance range is 1m ohms to 1 ohm at multiple points, with an accuracy of 0.1% to 0.5%.

[0090] For example, the insulation resistor has no fewer than 20 resistance values, covering all ranges of the calibrated system; the potential equalization resistor has 10 resistance values, also covering all ranges of the calibrated system. For both, the smaller the resistance value, the higher the accuracy. For example, for a 10k ohm insulation resistor, the accuracy can be 0.5%, while for a 1G ohm insulation resistor, the accuracy can be 1%.

[0091] For example, there are no less than 20 groups of insulation resistance values, and no less than 20 groups of insulation resistance calibration terminals, each group has 2 terminals, one of which is a common terminal, and there are no less than 22 terminals in total; there are 10 groups of potential equalization resistance values, and 10 groups of potential equalization calibration terminals, each group has 4 terminals, two of which are common terminals, and there are no less than 22 terminals in total.

[0092] The above-mentioned number of insulation resistors and potential equalization resistor groups is only for ease of understanding and is not limited to the number of groups. In addition, the resistance value of the insulation resistor or the resistance value of the potential equalization resistor can also be changed using the knob.

[0093] For example, when the potential equalization resistor is used to calibrate the potential equalization of the safety detection system, two wires are led out from each end of the potential equalization resistor to the panel, which can meet the four-wire measurement requirements; the above-mentioned insulation resistors and potential equalization resistors with standard values ​​are designed in the form of boards, which are easy to expand.

[0094] Specifically, voltmeter 5 is used to detect the terminal voltage of the DC charging gun of the safety testing system when calibrating the first resistor of the DC charging socket channel of the safety testing system, and to detect the terminal voltage of the AC charging gun of the safety testing system when calibrating the third resistor of the AC charging socket channel of the safety testing system. Ammeter 8 is used to detect the output current of the potential equalization terminal of the safety testing system when calibrating the fifth resistor of the potential equalization channel of the safety testing system.

[0095] For example, the DC voltmeter 5 on the wiring panel of the calibration device has the characteristics of high precision, high input impedance and large range. The two measuring ends of the voltmeter 5 are led out from the inside of the calibration device to the wiring panel, which are the voltmeter wiring terminals 10; the DC ammeter on the wiring panel of the calibration device has the characteristics of high precision, and the two measuring ends of the ammeter 8 are led out from the inside of the calibration device to the wiring panel, which are the ammeter wiring terminals 11.

[0096] For example, all connections at both ends of the voltmeter 5 are achieved by connecting to the voltmeter terminal 10. For the convenience of description, the specification directly uses "connecting to both ends of the voltmeter 5" to indicate it; similarly, all connections at both ends of the ammeter 8 are achieved by connecting to the voltmeter terminal 11. For the convenience of description, the specification directly uses "connecting to both ends of the ammeter 8" to indicate it.

[0097] Specifically, the device housing 1 is used to integrate the insulation resistance calibration terminal 2, the potential equalization calibration terminal 3, the AC charging socket 9, the AC charging socket wiring harness lead-out terminal 7, the DC charging socket 6 and the DC charging socket wiring harness lead-out terminal 4 on the wiring panel.

[0098] Exemplarily, the device housing 1 is a metal shielding housing used to enclose the required electronic components and wiring terminals to prevent injury from exposed high voltage electricity during use, and is provided with a movable handle.

[0099] In one embodiment, based on the calibration device of the terminal of the new energy vehicle safety and regulation testing system, the calibration method of the terminal of the new energy vehicle safety and regulation testing system is described in detail as follows:

[0100] A calibration method for the terminal of a new energy vehicle safety testing system, such as Figure 2 As shown, it mainly includes three items of testing: the first item: using the DC charging socket 6, the DC charging socket harness lead-out terminal 4 and the insulation resistance calibration terminal 2, the first resistance of the DC charging socket channel of the safety testing system is calibrated; the second item: using the AC charging socket 9, the AC charging socket harness lead-out terminal 7 and the insulation resistance calibration terminal 2, the third resistance of the AC charging socket channel of the safety testing system is calibrated; the third item: using the potential equalization calibration terminal 3 and the potential equalization resistor, the fifth resistance of the potential equalization channel of the safety testing system is calibrated.

[0101] Among them, the above-mentioned "first resistor", "second resistor" and similar descriptions are for distinguishing corresponding parameters, and do not calibrate only one resistor. In actual process, the resistor that needs to be calibrated can be used as the resistor mentioned here.

[0102] The first project: Use the DC charging socket 6, the DC charging socket harness lead-out terminal 4 and the insulation resistance calibration terminal 2 to calibrate the first resistance of the DC charging socket channel of the safety testing system, including: first, connect the DC charging gun of the safety testing system to the DC charging socket 6, use a wire to connect the DC charging socket harness lead-out terminal 4 to both ends of the voltmeter 5, obtain the relevant voltage parameter values ​​of the first debugging point and the relevant voltage parameter values ​​of the second debugging point, and determine the DC voltage calibration coefficient of the safety testing system based on the relevant voltage parameter values ​​of the first debugging point and the relevant voltage parameter values ​​of the second debugging point, and calibrate the DC voltage of the safety testing system based on the DC voltage calibration coefficient; the first debugging point and the second debugging point are voltage debugging points in the first preset voltage segment.

[0103] For example, during the calibration of the first resistor, the resistance value displayed by the safety detection system is calculated by collecting voltage data and current data within the safety detection system, so the process of calibrating the resistor is actually calibrating the resistor by calibrating the collected voltage data or the collected current data. In the present invention, the insulation resistance measurement range of the safety detection system has a large span (involving up to 7 orders of magnitude of measurement) and a large number of linear intervals (more than 20). By taking two key points in each linear interval to perform the slope and offset value calibration calculation of the segment, the accuracy of the parameter measurement accuracy is guaranteed. The above-mentioned first voltage debugging point and second voltage debugging point are the two key points where the voltage standard value of the corresponding calibration device is taken within the preset voltage segment.

[0104] Specifically, the voltage parameter values ​​related to the first debugging point include the voltage measurement value x1 of the safety detection system corresponding to the first debugging point and the voltage measurement value y1 of the calibration device corresponding to the first debugging point; the voltage parameter values ​​related to the second debugging point include the voltage measurement value x2 of the safety detection system corresponding to the second debugging point and the voltage measurement value y2 of the calibration device corresponding to the second debugging point; the voltage calibration coefficient includes the voltage slope coefficient k u and voltage offset coefficient b u .

[0105] The calculation formula for the voltage calibration coefficient includes:

[0106]

[0107]

[0108] Exemplarily, the voltage calibration coefficient method obtained by the above process is a method for obtaining the voltage calibration coefficient of all linear intervals, and the voltage of all linear intervals is first calibrated in the safety detection system, so that the voltage output by the internal DC high-voltage source of the subsequent safety detection system is accurate. After the DC voltage of the safety detection system is calibrated, the system outputs the voltage, which is applied to the object under test, and the voltage and current values ​​of the test process are collected. The measured resistance value is calculated according to Ohm's law, which is the test resistance value, such as Figure 3 As shown, the object to be measured can be a calibration device or a car to be measured. As long as the current is corrected, the measurement result displayed by the system will be corrected.

[0109] Secondly, after calibrating the DC voltage of the safety testing system, disconnect the wiring harness at both ends of the DC charging socket wiring harness lead-out terminal 4 and the voltmeter 5, and connect the DC socket wiring harness lead-out terminal to the first terminal of the insulation resistance calibration terminal 2 to obtain the first resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the first target voltage value.

[0110] Exemplarily, the voltage applied to the insulation resistor connected to the first terminal is a calibrated first preset voltage segment voltage corresponding to the first resistance value. The voltage applied to the insulation resistor connected to the second terminal described below is also a calibrated first preset voltage segment voltage corresponding to the second resistance value, i.e., the first target voltage value described above and below.

[0111] Lead the DC socket wiring harness lead-out end to the second terminal of the insulation resistance calibration terminal 2, and obtain the second resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the first target voltage value; the insulation resistance value corresponding to the first terminal and the insulation resistance value corresponding to the second terminal are within the first preset resistance segment.

[0112] A DC current calibration coefficient of the safety detection system is determined based on the first target voltage value, the first resistance value, the second resistance value, the insulation resistance value corresponding to the first wiring terminal, and the insulation resistance value corresponding to the second wiring terminal.

[0113] Specifically, the DC current calibration coefficient includes the current slope coefficient k a and current offset coefficient b a ; The calculation formula for the DC current calibration coefficient includes:

[0114]

[0115]

[0116] Wherein, U is the first target voltage value, R1 is the first resistance value, R2 is the second resistance value, R1′ is the insulation resistance value corresponding to the first terminal, and R2′ is the insulation resistance value corresponding to the second terminal.

[0117] Finally, when the voltage value measured by the safety detection system is the first target voltage value, the sampling current of the DC charging socket channel of the safety detection system is obtained, and based on the sampling current of the DC charging socket channel, the first target voltage value and the DC current calibration coefficient, the first resistance of the DC charging socket channel of the safety detection system is calibrated.

[0118] Specifically, the sampling current I of the DC charging socket channel a The calculation formula includes:

[0119]

[0120] Among them, R i It is the internal standard shunt resistor of the safety detection system, U x is the sampling voltage of the x-th sampling point at both ends of the insulation resistance channel shunt of the safety testing system, t is the test time; [1000t / 300]-2≥2.

[0121] The resistance value R after calibration of the first resistor of the DC charging socket channel of the safety testing system a for:

[0122]

[0123] For example, after the first resistance is calibrated, the DC current calibration coefficient includes the current slope coefficient k a and current offset coefficient b a By calibrating the second resistor, the insulation resistance calibration within the first preset voltage segment is completed, and the insulation resistance calibration of the next preset voltage segment can be continued.

[0124] For example, the second project, calibrating the insulation resistance of the AC charging socket channel, follows a similar approach to the first project. The safety testing system simply replaces the DC channel with an AC channel, and the calibration device utilizes only the AC charging socket 9 and the AC charging socket wiring harness lead-out terminal 7. For completeness, the second project is briefly described below. The technical solutions described in the first project are applicable to the second project.

[0125] The second project uses the AC charging socket 9, the AC charging socket harness lead-out terminal 7, and the insulation resistance calibration terminal 2 to calibrate the third resistance of the AC charging socket channel of the safety testing system, including:

[0126] First, connect the AC charging gun of the safety testing system to the AC charging socket 9, use a wire to connect the AC charging socket harness lead-out terminal 7 to both ends of the voltmeter 5, obtain the relevant voltage parameter value of the third debugging point and the relevant voltage parameter value of the fourth debugging point, and determine the AC voltage calibration coefficient of the safety testing system based on the relevant voltage parameter value of the third debugging point and the relevant voltage parameter value of the fourth debugging point, and calibrate the AC voltage of the safety testing system based on the AC voltage calibration coefficient; the third debugging point and the fourth debugging point are voltage debugging points in the second preset voltage segment.

[0127] Specifically, the voltage parameter values ​​related to the third debugging point include the voltage measurement value x1 of the safety detection system corresponding to the third debugging point and the voltage measurement value y1 of the calibration device corresponding to the third debugging point; the voltage parameter values ​​related to the fourth debugging point include the voltage measurement value x2 of the safety detection system corresponding to the fourth debugging point and the voltage measurement value y2 of the calibration device corresponding to the fourth debugging point; the voltage calibration coefficient includes the voltage slope coefficient k u and voltage offset coefficient b u .

[0128] The calculation formula for the voltage calibration coefficient includes:

[0129]

[0130]

[0131] Secondly, after calibrating the AC voltage of the safety testing system, disconnect the AC charging socket harness lead-out terminal 7 and the harness at both ends of the voltmeter 5, and lead the AC socket harness lead-out terminal to the third terminal of the insulation resistance calibration terminal 2 to obtain the third resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the second target voltage value.

[0132] Lead the AC socket wiring harness lead-out end to the fourth terminal of the insulation resistance calibration terminal 2, and obtain the fourth resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the second target voltage value; the resistance value of the insulation resistance corresponding to the third terminal and the resistance value of the insulation resistance corresponding to the fourth terminal are within the second preset resistance segment.

[0133] An AC current calibration coefficient of the safety detection system is determined based on the second target voltage value, the third resistance value, the fourth resistance value, the insulation resistance corresponding to the third terminal, and the insulation resistance corresponding to the fourth terminal.

[0134] Specifically, the AC current calibration coefficient includes the current slope coefficient k aj and current offset coefficient b aj ; The calculation formula for the AC current calibration coefficient includes:

[0135]

[0136]

[0137] Among them, U j is the second target voltage value, R 1j is the third resistor value, R 2j is the fourth resistor value, R 1j ' is the insulation resistance value corresponding to the third terminal, R 2j ' is the insulation resistance value corresponding to the fourth terminal.

[0138] Finally, when the voltage value measured by the safety detection system is the second target voltage value, the sampling current of the AC charging socket channel of the safety detection system is obtained, and based on the sampling current of the AC charging socket channel, the second target voltage value and the AC current calibration coefficient, the third resistance of the AC charging socket channel of the safety detection system is calibrated.

[0139] Specifically, the sampling current I of the AC charging socket channel a The calculation formula includes:

[0140]

[0141] Among them, R ij It is the internal standard shunt resistor of the safety detection system, U xj The xth two ends of the insulation resistance channel shunt of the safety detection system j The sampling voltage of the sampling points, t is the test time; [1000t / 300]-2≥2.

[0142] The resistance value R of the third resistor of the AC charging socket channel of the safety testing system after calibration aj for:

[0143]

[0144] Exemplarily, the calibration process of the first and second items is a simplified system internal operation process. When the safety detection system is actually operated to test and calibrate the current value, the connection confirmation device of the charging gun holder is used to verify other functions of the safety detection system.

[0145] The third project: Using potential equalization calibration terminal 3 and a potential equalization resistor, calibrate the fifth resistor of the potential equalization channel of the safety testing system, including:

[0146] First, the two potential equalization terminals of the safety detection system are connected to the two terminals of the ammeter 8, and the relevant current parameter values ​​of the fifth debugging point and the sixth debugging point are obtained. Based on the relevant current parameter values ​​of the fifth debugging point and the relevant current parameter values ​​of the sixth debugging point, the calibration coefficient of the current of the potential equalization channel of the safety detection system is obtained; the current of the potential equalization channel of the safety detection system is calibrated based on the calibration coefficient of the current of the potential equalization channel; the fifth debugging point and the sixth debugging point are current debugging points in the preset current segment.

[0147] For example, in order to reduce the error in the test process, the internal structure of the potential equalization calibration terminal 3 in the calibration device adopts a four-wire connection, such as Figure 4 As shown. Among them, the instrument is the host of the safety system to be calibrated, R1, R2, R3, and R4 are test harnesses, and the extended test harness has wire resistance. The harness can be the harness of the charging gun or the test harness directly drawn from the host. Then the two potential equalization terminals of the safety detection system are connected to the two terminals of the ammeter 8. It can be through the harness of the charging gun or the test harness directly drawn from the host. The harness includes a connection method with the inside of the calibration device. The resistance R of the object to be measured in the figure is a potential equalization resistor with a high-precision, small-resistance standard resistance inside the calibration device, and U is the voltage across the resistor R.

[0148] Specifically, the relevant current parameter value of the fifth debugging point includes the current measurement value x of the safety detection system corresponding to the fifth debugging point. 1b The current measurement value y of the calibration device corresponding to the fifth debugging point 1b The relevant current parameter values ​​of the sixth debugging point include the current measurement value x corresponding to the fourth debugging point of the safety detection system 2b The current measurement value y of the calibration device corresponding to the sixth debugging point 2b ; The current calibration coefficient includes the current slope coefficient k b and current offset coefficient b b .

[0149] The calculation formula for the current calibration coefficient includes:

[0150]

[0151]

[0152] Secondly, after calibrating the current of the potential equalization channel of the safety detection system, disconnect the two potential equalization terminals of the safety detection system from the ammeter 8, connect the two potential equalization terminals of the safety detection system to the fifth terminal of the potential equalization calibration terminal 3, and obtain the first sampling voltage measured by the safety detection system when the current value measured by the safety detection system is the target current value; calculate the fifth resistance value of the safety detection system based on the target current value and the first sampling voltage.

[0153] Exemplarily, the current calibration coefficient method obtained by the above process is a method for obtaining the current calibration coefficient of all linear interval segments. After the DC voltage of the safety detection system is calibrated, the constant current source of the safety detection system outputs a constant current, and the internal voltmeter of the system collects the voltage across the measured resistor and calculates the resistance value of the measured resistor. The calculated resistance value of the measured resistor is the measurement result displayed by the system, and the measurement result is calibrated according to the measurement result and the standard resistance value corresponding to the resistance value of the measured resistor.

[0154] Specifically, the first sampling voltage includes sampling voltages of a plurality of sampling points;

[0155] The fifth resistance value R of the safety testing system b The calculation formula includes:

[0156]

[0157] Among them, I b is the target constant current value, U b is the sampling voltage of the x-th sampling point, and t is the test time;

[0158] Secondly, the two potential equalization terminals of the safety detection system are connected to the sixth terminal of the potential equalization calibration terminal 3 to obtain a second sample voltage measured by the safety detection system when the current value measured by the safety detection system is the target current value.

[0159] The sixth resistance value of the safety detection system is calculated based on the target current value and the second sampling voltage; the resistance value of the potential equalization resistor corresponding to the fifth terminal and the resistance value of the potential equalization resistor corresponding to the sixth terminal are within the third preset resistance segment.

[0160] Specifically, the second sampling voltage includes sampling voltages of a plurality of sampling points;

[0161] The sixth resistance value R of the safety detection system c The calculation formula includes:

[0162]

[0163] Among them, I c is the target constant current value, U cis the sampling voltage at the x-th sampling point, t is the test time; [1000t / 300]-2≥2.

[0164] A calibration coefficient of the fifth resistor of the potential equalization channel of the safety testing system is determined based on the fifth resistance value, the sixth resistance value, the resistance value of the potential equalization resistor corresponding to the fifth terminal, and the resistance value of the potential equalization resistor corresponding to the sixth terminal.

[0165] Specifically, the calculation formula for the calibration coefficient of the fifth resistor of the potential equalization channel of the safety testing system includes:

[0166]

[0167]

[0168] Among them, R c is the sixth resistor value, R b ' is the resistance of the potential equalization resistor corresponding to the fifth terminal, R c ' is the resistance of the potential equalization resistor corresponding to the sixth terminal.

[0169] Finally, based on the calibration coefficient of the fifth resistor of the potential equalization resistance value, the fifth resistor of the potential equalization channel of the safety testing system is calibrated.

[0170] Specifically, the calculation formula for calibrating the fifth resistor of the potential equalization channel of the safety testing system includes:

[0171] R x =R b ×k r +b r .

[0172] The beneficial effect of the calibration method using the above technical solution is that it can realize the end calibration of the safety detection system, eliminate the errors caused by the test harness, and ensure the accuracy and rationality of the system test results; during calibration, according to the actual problem of piecewise linearity of parameters such as the output voltage and insulation resistance of the safety detection system across orders of magnitude, the slope + offset calculation method is used to correct the parameters of each linear segment interval to ensure that the accuracy of the full range interval meets the requirements; the high-precision, wide power range, and multi-resistance channel switching mode used by the calibration device can meet the calibration of single-function safety equipment end, and is also suitable for the end calibration of multi-function safety systems. It has strong versatility and high accuracy. The device adopts a multi-board design with strong scalability.

[0173] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0174] The calibration method for the terminal of the new energy vehicle safety testing system provided in the embodiment of the present application can be applied to terminal devices such as computers, tablet computers, laptops, netbooks, personal digital assistants (PDAs), etc. The embodiment of the present application does not impose any restrictions on the specific type of terminal devices.

[0175] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it can implement the steps in each embodiment of the calibration method of the terminal of the new energy vehicle safety testing system.

[0176] An embodiment of the present application provides a computer program product. When the computer program product runs on a mobile terminal, the mobile terminal can implement the methods involved in each embodiment of the calibration method of the terminal of the above-mentioned new energy vehicle safety testing system.

[0177] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process of the above-mentioned method embodiment by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can at least include: any entity or device capable of carrying computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. For example, a USB flash drive, mobile hard drive, magnetic disk, or optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals or telecommunication signals.

[0178] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0179] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0180] In the embodiments provided in this application, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0181] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0182] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A calibration method for the terminal of a new energy vehicle safety testing system, characterized in that: include: Use the DC charging socket, DC charging socket harness lead-out terminal, and insulation resistance calibration terminal to calibrate the first resistance of the DC charging socket channel of the safety testing system; Calibrate the third resistance of the AC charging socket channel of the safety testing system using the AC charging socket, the AC charging socket wiring harness lead-out terminal, and the insulation resistance calibration terminal; Calibrate the fifth resistor of the potential equalization channel of the safety testing system using the potential equalization calibration terminal and the potential equalization resistor; The method of calibrating the first resistance of the DC charging socket channel of the safety testing system using the DC charging socket, the DC charging socket wiring harness lead-out terminal, and the insulation resistance calibration terminal includes: Connecting a DC charging gun of a safety testing system to the DC charging socket, connecting the wiring harness lead-out end of the DC charging socket to two ends of a voltmeter using a wire, obtaining relevant voltage parameter values ​​of a first debugging point and a second debugging point, and determining a DC voltage calibration coefficient of the safety testing system based on the relevant voltage parameter values ​​of the first debugging point and the relevant voltage parameter values ​​of the second debugging point, and calibrating the DC voltage of the safety testing system based on the DC voltage calibration coefficient; the first debugging point and the second debugging point are voltage debugging points in a first preset voltage segment; After calibrating the DC voltage of the safety testing system, disconnecting the DC charging socket harness lead-out terminal from the harness at both ends of the voltmeter, connecting the DC charging socket harness lead-out terminal to the first terminal of the insulation resistance calibration terminal, and obtaining a first resistance value measured by the safety testing system when the voltage value measured by the safety testing system is a first target voltage value; Connecting a wire from the DC charging socket harness lead-out terminal to the second terminal of the insulation resistance calibration terminal, obtaining a second resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the first target voltage value; the insulation resistance values ​​corresponding to the first terminal and the insulation resistance values ​​corresponding to the second terminal are within a first preset resistance range; Determining a DC current calibration coefficient of the safety testing system based on the first target voltage value, the first resistance value, the second resistance value, the insulation resistance corresponding to the first wiring terminal, and the insulation resistance corresponding to the second wiring terminal; Obtain a sampled current of a DC charging socket channel of the safety testing system when the voltage value measured by the safety testing system is the first target voltage value, and calibrate a first resistance of the DC charging socket channel of the safety testing system based on the sampled current of the DC charging socket channel, the first target voltage value, and the DC current calibration coefficient.

2. The calibration method for the terminal of the new energy vehicle safety testing system according to claim 1, characterized in that: The voltage parameter value related to the first debugging point includes the voltage measurement value of the safety detection system corresponding to the first debugging point The voltage measurement value of the calibration device corresponding to the first debugging point The voltage parameter value of the second debugging point includes the voltage measurement value of the safety detection system corresponding to the second debugging point The voltage measurement value of the calibration device corresponding to the second debugging point ; The voltage calibration coefficient includes a voltage slope coefficient and voltage offset coefficient ; The calculation formula of the voltage calibration coefficient is include: The current calibration coefficient includes a current slope coefficient and current offset coefficient The calculation formula of the current calibration coefficient includes: in, is the first target voltage value, is the first resistance value, is the second resistance value, is the insulation resistance value corresponding to the first wiring terminal, is the insulation resistance value corresponding to the second wiring terminal; The sampling current of the DC charging socket channel The calculation formula includes: in, R i is the internal standard shunt resistor of the safety detection system, U x The insulation resistance channel shunt at both ends of the safety detection system The sampling voltage of the sampling point, t For testing time; The resistance value of the first resistor of the DC charging socket channel of the safety detection system after calibration for: 。 3. The calibration method for the terminal of the new energy vehicle safety testing system according to claim 1, characterized in that: The method of calibrating the third resistance of the AC charging socket channel of the safety testing system using the AC charging socket, the AC charging socket harness lead-out terminal, and the insulation resistance calibration terminal includes: Connecting an AC charging gun of a safety testing system to the AC charging socket, connecting the wiring harness lead-out end of the AC charging socket to two ends of a voltmeter using a wire, obtaining relevant voltage parameter values ​​of a third debugging point and relevant voltage parameter values ​​of a fourth debugging point, and determining an AC voltage calibration coefficient of the safety testing system based on the relevant voltage parameter values ​​of the third debugging point and the relevant voltage parameter values ​​of the fourth debugging point, and calibrating the AC voltage of the safety testing system based on the AC voltage calibration coefficient; the third debugging point and the fourth debugging point are voltage debugging points in a second preset voltage segment; After calibrating the AC voltage of the safety testing system, disconnecting the AC charging socket harness lead-out terminal from the harness at both ends of the voltmeter, connecting the AC charging socket harness lead-out terminal to the third terminal of the insulation resistance calibration terminal, and obtaining a third resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the second target voltage value; Connecting a wire from the AC charging socket harness lead-out terminal to the fourth terminal of the insulation resistance calibration terminal, obtaining a fourth resistance value measured by the safety testing system when the voltage value measured by the safety testing system is the second target voltage value; and the insulation resistance values ​​corresponding to the third terminal and the insulation resistance values ​​corresponding to the fourth terminal are within a second preset resistance range; Determining an AC current calibration coefficient of the safety testing system based on the second target voltage value, the third resistance value, the fourth resistance value, the insulation resistance corresponding to the third terminal, and the insulation resistance corresponding to the fourth terminal; Obtain a sampled current of the AC charging socket channel of the safety testing system when the voltage value measured by the safety testing system is the second target voltage value, and calibrate the third resistance of the AC charging socket channel of the safety testing system based on the sampled current of the AC charging socket channel, the second target voltage value, and the AC current calibration coefficient.

4. The calibration method for the terminal of the new energy vehicle safety testing system according to claim 1, characterized in that: The step of calibrating the fifth resistor of the potential equalization channel of the safety detection system by using the potential equalization calibration terminal and the potential equalization resistor includes: Connecting the two potential equalization terminals of the safety testing system to the two terminals of an ammeter, obtaining relevant current parameter values ​​of a fifth debugging point and a sixth debugging point, and obtaining a calibration coefficient of the current of the potential equalization channel of the safety testing system based on the relevant current parameter values ​​of the fifth debugging point and the relevant current parameter values ​​of the sixth debugging point; calibrating the current of the potential equalization channel of the safety testing system based on the calibration coefficient of the current of the potential equalization channel; the fifth debugging point and the sixth debugging point are current debugging points in a preset current segment; After calibrating the current of the potential equalization channel of the safety testing system, disconnecting the two potential equalization terminals of the safety testing system from the ammeter, connecting the two potential equalization terminals of the safety testing system to the fifth terminal of the potential equalization calibration terminal, and obtaining a first sampled voltage measured by the safety testing system when the current value measured by the safety testing system is the target current value; Calculating a fifth resistance value of the safety detection system based on the target current value and the first sampling voltage; Connecting the two potential equalization terminals of the safety testing system to the sixth terminal of the potential equalization calibration terminal, and obtaining a second sampled voltage measured by the safety testing system when the current value measured by the safety testing system is the target current value; calculating a sixth resistance value of the safety detection system based on the target current value and the second sampling voltage; the resistance value of the potential equalization resistor corresponding to the fifth terminal and the resistance value of the potential equalization resistor corresponding to the sixth terminal are within a third preset resistance segment; determining a calibration coefficient of a fifth resistor of a potential equalization channel of the safety testing system based on the fifth resistance value, the sixth resistance value, the resistance value of the potential equalization resistor corresponding to the fifth terminal, and the resistance value of the potential equalization resistor corresponding to the sixth terminal; The fifth resistor of the potential equalization channel of the safety testing system is calibrated based on the calibration coefficient of the fifth resistor of the potential equalization channel.

5. The calibration method for the terminal of the new energy vehicle safety testing system according to claim 4, characterized in that: The first sampling voltage includes sampling voltages of multiple sampling points; The fifth resistance value of the safety detection system The calculation formula include: in, is the target constant current value, For the The sampling voltage of the sampling point, t For testing time; The fifth resistor value is , the sixth resistor value is The resistance of the potential equalization resistor corresponding to the first terminal of the potential equalization calibration terminal is The resistance of the potential equalization resistor corresponding to the second terminal of the potential equalization calibration terminal is '; The calibration coefficient of the fifth resistor of the potential equalization channel of the safety detection system includes the slope coefficient of the resistor and the offset coefficient of the resistor ; The calculation formula for the calibration coefficient of the fifth resistor of the potential equalization channel of the safety detection system includes: in, is the sixth resistance value, ' is the resistance value of the potential equalization resistor corresponding to the fifth terminal, ' is the resistance of the potential equalization resistor corresponding to the sixth terminal.

6. A calibration device for the terminal of a new energy vehicle safety inspection system, characterized in that: Used to implement the calibration method of the terminal of the new energy vehicle safety testing system according to any one of claims 1 to 5, the calibration device includes: an insulation resistance calibration terminal, a potential equalization calibration terminal, a DC charging socket, a DC charging socket wiring harness lead-out terminal, an AC charging socket, an AC charging socket wiring harness lead-out terminal, a voltmeter and an ammeter; The insulation resistance calibration terminal is used to calibrate the first resistance of the DC charging socket channel and the third resistance of the AC charging socket channel of the safety testing system; the DC charging socket channel is formed by the host of the safety testing system to the end of the DC charging gun; the AC charging socket channel is formed by the host of the safety testing system to the end of the AC charging gun; The potential equalization calibration terminal is used to calibrate the fifth resistor of the potential equalization channel of the safety testing system; the potential equalization channel is formed by the host of the safety testing system to the potential equalization terminal on the host; The DC charging socket is used to connect to the DC charging gun of the safety testing system and has a built-in DC charging gun socket connection confirmation device; the DC charging socket wiring harness lead-out terminal is internally connected to the effective terminal of the DC charging socket and externally located on the wiring panel, and is used to connect to the insulation resistance calibration terminal when calibrating the first resistance of the DC charging socket channel of the safety testing system; The AC charging socket is used to connect to the AC charging gun of the safety testing system and has a built-in AC charging gun socket connection confirmation device; the AC charging socket wiring harness lead-out terminal is internally connected to the effective terminal of the AC charging socket and externally located on the wiring panel; and is used to connect to the insulation resistance calibration terminal when calibrating the third resistance of the AC charging socket channel of the safety testing system; The voltmeter is used to detect the terminal voltage of the DC charging gun of the safety testing system when calibrating the first resistance of the DC charging socket channel of the safety testing system, and to detect the terminal voltage of the AC charging gun of the safety testing system when calibrating the third resistance of the AC charging socket channel of the safety testing system; The ammeter is used to detect the output current of the potential equalization terminal of the safety detection system when calibrating the fifth resistor of the potential equalization channel of the safety detection system.

7. The calibration device for the terminal of the new energy vehicle safety testing system according to claim 6, characterized in that: The insulation resistance calibration terminal is a lead-out terminal of an insulation resistor having a preset standard resistance value inside, and the lead-out terminal of the insulation resistor is formed by leading a wire from each end of the insulation resistor to the wiring panel; the insulation resistance calibration terminal has multiple terminals; The potential equalization calibration terminal is the lead-out end of a potential equalization resistor having a preset standard resistance value inside. The lead-out end of the potential equalization resistor is formed by two wires extending from each end of the potential equalization resistor to the wiring panel; the potential equalization calibration terminal has multiple terminals.

8. The calibration device for the terminal of the new energy vehicle safety testing system according to claim 6, characterized in that: It also includes a device housing, which is used to integrate the insulation resistance calibration terminal, the potential equalization calibration terminal, the AC charging socket, the AC charging socket wiring harness lead-out terminal, the DC charging socket and the DC charging socket wiring harness lead-out terminal on the wiring panel.

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