A calibration device for a whole vehicle non-disassembly charging safety inspection equipment of an electric vehicle

Abstract

The application provides a kind of electric vehicle whole car non-disassembly charging safety inspection equipment calibration device, belongs to the technical field of detection equipment.The electric vehicle whole car non-disassembly charging safety inspection equipment calibration device includes control unit, back-feeding power supply, adjustable load unit, first switch, second switch, third switch, voltage sensor and current sensor;The first output end of back-feeding power supply is connected with the first DC power output end of charging interface through the first switch, and the second output end of back-feeding power supply is connected with the second DC power output end of charging interface through the second switch;The first signal end of control unit is connected with the auxiliary power output end of charging interface, and the second signal end of control unit is connected with the communication end of charging interface;Adjustable load unit is configured to form a charging loop with the two DC power output ends of charging interface.The application can solve the problem of complex operation in the calibration process of existing charging safety inspection equipment.

Description

Technical Field

[0001] This application relates to the field of testing equipment technology, and in particular to a calibration device for electric vehicle charging safety inspection equipment without disassembling the whole vehicle. Background Technology

[0002] Electric vehicle charging safety testing equipment detects potential safety hazards in the power battery during the charging process of electric vehicles. To prevent battery spontaneous combustion during vehicle charging, the accuracy of charging current and voltage should be calibrated to prevent overcharging and thermal runaway.

[0003] To ensure the accuracy of charging safety testing equipment, the current and voltage of the equipment need to be calibrated. Currently, the common method is to use general-purpose instruments and corresponding auxiliary accessories to calibrate individual parameters of the charging safety testing equipment, which is a complicated operation.

[0004] Therefore, there is an urgent need to develop a calibration device to quickly, effectively, and accurately calibrate the current and voltage of charging safety testing equipment. Utility Model Content

[0005] This application provides a calibration device for electric vehicle charging safety inspection equipment without disassembling the vehicle, in order to solve the problem of complex operation in the calibration process of existing charging safety inspection equipment.

[0006] This application provides a calibration device for electric vehicle non-disassembly charging safety inspection equipment, including a control unit, a reverse power supply, an adjustable load unit, a first switch, a second switch, a third switch, a voltage sensor, and a current sensor; The first output terminal of the reverse power supply is connected to the first DC power output terminal of the charging interface via the first switch, and the second output terminal of the reverse power supply is connected to the second DC power output terminal of the charging interface via the second switch; the charging interface is connected to the output interface of the charging safety testing equipment. The first signal terminal of the control unit is connected to the auxiliary power output terminal of the charging interface, and the second signal terminal of the control unit is connected to the communication terminal of the charging interface. The adjustable load unit is configured to form a charging circuit with the first DC power output terminal of the charging interface and the second DC power output terminal of the charging interface; the voltage sensor is configured to detect the voltage across the adjustable load unit, and the current sensor is configured to detect the current of the adjustable load unit. The first end of the third switch is connected to the charging pile connection confirmation end of the charging interface, and the second end of the third switch is grounded through the confirmation resistor; The control terminals of the first switch, the second switch, the third switch, and the adjustable load unit are respectively connected to multiple signal output terminals of the control unit. The output terminals of the voltage sensor and the current sensor are respectively connected to two signal input terminals of the control unit. The control unit is configured to set a charging voltage calibration point and a charging current calibration point, and adjust the load size of the adjustable load unit to calibrate the charging voltage and charging current of the charging safety inspection equipment.

[0007] In one exemplary embodiment of this application, the adjustable load unit is an adjustable resistor unit, which includes a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first resistor, and a second resistor. The first end of the fourth switch is the first end of the adjustable load unit, the second end of the fourth switch is connected to the first end of the second resistor through the first resistor, the second end of the second resistor is connected to the first end of the fifth switch, and the second end of the fifth switch is the second end of the adjustable load unit. The first end of the sixth switch is connected to the second end of the fourth switch, and the second end of the sixth switch is connected to the second end of the second resistor; The first terminal of the seventh switch is connected to the first terminal of the second resistor, and the second terminal of the seventh switch is connected to the second terminal of the fifth switch; The control terminals of the fourth switch, the fifth switch, the sixth switch, and the seventh switch are respectively connected to multiple signal output terminals of the control unit.

[0008] In one exemplary embodiment of this application, the adjustable load unit is an inverter unit, the first input terminal of the inverter unit is the first terminal of the adjustable load unit, the second input terminal of the inverter unit is the second terminal of the adjustable load unit, and the output terminal of the inverter unit is used to connect in parallel with the power grid.

[0009] In one exemplary embodiment of this application, the first switch and the second switch are two normally open contacts of the same relay.

[0010] In one exemplary embodiment of this application, the calibration device for electric vehicle non-disassembly charging safety inspection equipment further includes: An environmental calibration unit is used to calibrate the charging safety testing equipment's measurement of environmental parameters.

[0011] In one exemplary embodiment of this application, the electric vehicle non-disassembly charging safety inspection equipment calibration device further includes: The display unit is used to display the detection data.

[0012] In one exemplary embodiment of this application, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are all relays.

[0013] In one exemplary embodiment of this application, the calibration device for electric vehicle non-disassembly charging safety inspection equipment further includes: The cabinet contains the control unit, the reverse power supply, the adjustable load unit, the first switch, the second switch, the third switch, the voltage sensor, and the current sensor. A fan is also installed inside the cabinet.

[0014] The beneficial effects of the electric vehicle non-disassembly charging safety inspection equipment calibration device provided in this application embodiment are as follows: In this embodiment, the adjustable load unit simulates the charging battery of an electric vehicle. During the calibration of the charging safety testing equipment, the calibration device is connected to the charging safety testing equipment via a charging interface. The auxiliary power output terminal of the charging interface outputs a low-voltage voltage. After detecting the voltage, the calibration device closes the third switch, then the first and second switches. The reverse power supply provides a high-voltage voltage (DC400V-800V). After the charging safety testing equipment detects that the voltage meets the charging requirements, it simulates charging the adjustable load unit according to the corresponding charging voltage level. The charging safety testing equipment communicates with the calibration device via a communication terminal. The calibration device can set charging voltage calibration points and charging current calibration points, upload these points to the charging safety testing equipment, and adjust the load size of the adjustable load unit through the control unit to match the charging current calibration point.

[0015] A voltage sensor is used to collect the simulated charging voltage, and a current sensor is used to collect the simulated charging current. The output signals of the voltage sensor and the current sensor are sent to the control unit. The control unit can calibrate the charging voltage of the charging safety inspection equipment by comparing the charging voltage calibration point with the simulated charging voltage, and can calibrate the charging current of the charging safety inspection equipment by comparing the charging current calibration point with the simulated charging current.

[0016] Therefore, the embodiments of this application calibrate the charging voltage and charging current of the charging safety inspection equipment by automatically setting the charging voltage and charging current calibration points. The structure is simple, the operation is convenient, the labor cost is saved, and the production efficiency is improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic block diagram of a calibration device for a non-disassembly charging safety inspection equipment for electric vehicles, provided in an embodiment of this application. Figure 2 This is a schematic diagram of the calibration process of a non-disassembly charging safety inspection device for electric vehicles provided in an embodiment of this application; Figure 3 This is a schematic diagram of the overall structure of a calibration device for a non-disassembly charging safety inspection equipment for electric vehicles, provided in an embodiment of this application. Figure 4 An exploded view of a calibration device for electric vehicle charging safety inspection equipment without disassembly, provided in an embodiment of this application; In the picture: 10 Adjustable load unit, 11 Voltage sensor, 12 Current sensor, 13 Control unit, 14 Display unit, 15 Reverse power supply, 16 Power supply, 17 Environmental calibration unit, 18 Charging interface, 19 Cabinet, 21 Relay. Detailed Implementation

[0019] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0020] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0021] The implementation of this application will be described in detail below with reference to the specific accompanying drawings: Figure 1 This is a schematic block diagram of a calibration device for a non-disassembly charging safety inspection equipment for electric vehicles, provided as an embodiment of this application. (Refer to...) Figure 1The calibration device for a non-disassembly charging safety inspection equipment for electric vehicles includes a control unit, a reverse power supply, an adjustable load unit, a first switch, a second switch, a third switch, a voltage sensor, and a current sensor. The first output terminal of the reverse power supply is connected to the first DC power output terminal of the charging interface via a first switch, and the second output terminal of the reverse power supply is connected to the second DC power output terminal of the charging interface via a second switch; the charging interface is connected to the output interface of the charging safety testing equipment. The first signal terminal of the control unit is connected to the auxiliary power output terminal of the charging interface, and the second signal terminal of the control unit is connected to the communication terminal of the charging interface. The adjustable load unit is configured to form a charging circuit with the first DC power output terminal of the charging interface and the second DC power output terminal of the charging interface; the voltage sensor is configured to detect the voltage across the adjustable load unit, and the current sensor is configured to detect the current of the adjustable load unit. The first terminal of the third switch is connected to the charging pile connection confirmation terminal of the charging interface, and the second terminal of the third switch is grounded through the confirmation resistor R4; The control terminals of the first switch, the second switch, the third switch, and the adjustable load unit are respectively connected to multiple signal output terminals of the control unit. The output terminals of the voltage sensor and the current sensor are respectively connected to two signal input terminals of the control unit. The control unit is configured to set the charging voltage calibration point and the charging current calibration point, and adjust the load size of the adjustable load unit to calibrate the charging voltage and charging current of the charging safety inspection equipment.

[0022] Reference Figure 2 In this embodiment, the adjustable load unit is used to simulate the charging battery of an electric vehicle. During the calibration of the charging safety testing equipment, the calibration device is connected via the charging interface (…). Figure 1 The charging safety testing equipment is connected to the DC charging pile socket. The auxiliary power output terminals (A+ and A-) of the charging interface output a low voltage. After the calibration device detects the voltage, it closes the third switch CC1. The charging safety testing equipment communicates with the calibration device through the communication terminals S+ and S- to exchange charging information. The calibration device then closes the first and second switches, and the reverse power supply provides a high voltage (DC400V-800V). This high voltage can simulate the output voltage of the electric vehicle's charging battery. After the charging safety testing equipment detects that the voltage meets the charging requirements, it simulates charging the adjustable load unit according to the corresponding charging voltage level. The charging safety testing equipment communicates with the calibration device through the communication terminal. The calibration device can set the charging voltage calibration point and the charging current calibration point, upload these points to the charging safety testing equipment, and adjust the load size of the adjustable load unit through the control unit to match the charging current calibration point.

[0023] A voltage sensor is used to collect the simulated charging voltage, and a current sensor is used to collect the simulated charging current. The output signals of the voltage sensor and the current sensor are sent to the control unit. The control unit can calibrate the charging voltage of the charging safety inspection equipment by comparing the charging voltage calibration point with the simulated charging voltage, and can calibrate the charging current of the charging safety inspection equipment by comparing the charging current calibration point with the simulated charging current.

[0024] Therefore, this embodiment calibrates the charging voltage and charging current of the charging safety inspection equipment by automatically setting the charging voltage and charging current calibration points. It has a simple structure, is easy to operate, saves labor costs, and improves production efficiency.

[0025] In one embodiment of this application, the adjustable load unit is an adjustable resistor unit, which includes a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first resistor, and a second resistor. The first end of the fourth switch is the first end of the adjustable load unit. The second end of the fourth switch is connected to the first end of the second resistor through the first resistor. The second end of the second resistor is connected to the first end of the fifth switch. The second end of the fifth switch is the second end of the adjustable load unit. The first terminal of the sixth switch is connected to the second terminal of the fourth switch, and the second terminal of the sixth switch is connected to the second terminal of the second resistor. The first terminal of the seventh switch is connected to the first terminal of the second resistor, and the second terminal of the seventh switch is connected to the second terminal of the fifth switch. The control terminals of the fourth, fifth, sixth, and seventh switches are respectively connected to multiple signal output terminals of the control unit.

[0026] Reference Figure 1 In this embodiment, the adjustable load unit can specifically be an adjustable resistor unit, the fourth switch can specifically be a relay KM1, the fifth switch can specifically be a relay KM2, the sixth switch can specifically be a relay KM3, and the seventh switch can specifically be a relay KM4. When the fourth and fifth switches are closed, the first DC power output terminal of the charging interface, the first resistor R1, the second resistor R2, and the second DC power output terminal of the charging interface constitute a charging circuit; when the fourth, sixth, and seventh switches are closed, the first DC power output terminal of the charging interface, the second resistor R2, and the second DC power output terminal of the charging interface constitute a charging circuit. Therefore, by controlling the closing of different switches, the load of the charging circuit can be adjusted, thereby realizing the function of the adjustable load unit.

[0027] The adjustable resistor unit is made of special alloy and has a heat sink made of 304 stainless steel on the outside. The middle is filled with an insulating medium to encapsulate the resistor. It has the characteristics of good insulation performance, high heat dissipation performance and uniform heat conduction. The resistive load adopts a straight structure, which occupies little space and can meet the needs of power consumption.

[0028] In one embodiment of this application, the adjustable load unit is an inverter unit, the first input terminal of the inverter unit is the first terminal of the adjustable load unit, the second input terminal of the inverter unit is the second terminal of the adjustable load unit, and the output terminal of the inverter unit is used to connect in parallel with the power grid.

[0029] In this embodiment, the adjustable load unit can be an inverter unit, which converts the DC power from the charging interface into AC power and feeds it back to the power grid, which is beneficial for realizing the recycling of electrical energy.

[0030] In one embodiment of this application, the first switch and the second switch are two normally open contacts of the same relay.

[0031] Reference Figure 1 In this embodiment, the first switch and the second switch are two normally open contacts of the same relay KM0. The reverse power supply is connected or disconnected through the relay KM0, which further simplifies the circuit structure.

[0032] In one embodiment of this application, the calibration device for the electric vehicle non-disassembly charging safety inspection equipment further includes: The environmental calibration unit is used to calibrate the charging safety testing equipment's measurement of environmental parameters.

[0033] The environmental calibration unit is used to detect environmental parameters such as temperature, humidity and atmospheric pressure in the area where the electric vehicle is located, and compares them with the test results of the charging safety testing equipment, so as to calibrate the test results of the charging safety testing equipment based on the comparison results.

[0034] In one embodiment of this application, the calibration device for the electric vehicle non-disassembly charging safety inspection equipment further includes: The display unit is used to display the detection data.

[0035] In this embodiment, the measurement data during the calibration process can be displayed through the display unit, making it convenient for staff to understand the calibration process at any time.

[0036] Reference Figures 3-4 In one embodiment of this application, the calibration device for the electric vehicle non-disassembly charging safety inspection equipment further includes: The cabinet contains the control unit, reverse power supply, adjustable load unit, first switch, second switch, third switch, voltage sensor and current sensor, and a fan.

[0037] In this embodiment, the aforementioned control unit, reverse power supply, adjustable load unit, first switch, second switch, third switch, voltage sensor, and current sensor are all installed inside the cabinet. A fan is also installed inside the cabinet to dissipate heat inside the cabinet when the temperature inside the cabinet is too high.

[0038] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A calibration device for electric vehicle charging safety inspection equipment without disassembly, characterized in that, It includes a control unit, a reverse power supply, an adjustable load unit, a first switch, a second switch, a third switch, a voltage sensor, and a current sensor; The first output terminal of the reverse power supply is connected to the first DC power output terminal of the charging interface through the first switch, and the second output terminal of the reverse power supply is connected to the second DC power output terminal of the charging interface through the second switch; the charging interface is connected to the output interface of the charging safety testing equipment. The first signal terminal of the control unit is connected to the auxiliary power output terminal of the charging interface, and the second signal terminal of the control unit is connected to the communication terminal of the charging interface. The adjustable load unit is configured to form a charging circuit with the first DC power output terminal of the charging interface and the second DC power output terminal of the charging interface; the voltage sensor is configured to detect the voltage across the adjustable load unit, and the current sensor is configured to detect the current of the adjustable load unit. The first end of the third switch is connected to the charging pile connection confirmation end of the charging interface, and the second end of the third switch is grounded through the confirmation resistor; The control terminals of the first switch, the second switch, the third switch, and the adjustable load unit are respectively connected to multiple signal output terminals of the control unit. The output terminals of the voltage sensor and the current sensor are respectively connected to two signal input terminals of the control unit. The control unit is configured to set a charging voltage calibration point and a charging current calibration point, and adjust the load size of the adjustable load unit to calibrate the charging voltage and charging current of the charging safety inspection equipment.

2. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 1, characterized in that, The adjustable load unit is an adjustable resistor unit, which includes a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first resistor, and a second resistor. The first end of the fourth switch is the first end of the adjustable load unit, the second end of the fourth switch is connected to the first end of the second resistor through the first resistor, the second end of the second resistor is connected to the first end of the fifth switch, and the second end of the fifth switch is the second end of the adjustable load unit. The first end of the sixth switch is connected to the second end of the fourth switch, and the second end of the sixth switch is connected to the second end of the second resistor; The first terminal of the seventh switch is connected to the first terminal of the second resistor, and the second terminal of the seventh switch is connected to the second terminal of the fifth switch; The control terminals of the fourth switch, the fifth switch, the sixth switch, and the seventh switch are respectively connected to multiple signal output terminals of the control unit.

3. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 1, characterized in that, The adjustable load unit is an inverter unit. The first input terminal of the inverter unit is the first terminal of the adjustable load unit, the second input terminal of the inverter unit is the second terminal of the adjustable load unit, and the output terminal of the inverter unit is used to connect in parallel with the power grid.

4. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 1, characterized in that, The first switch and the second switch are two normally open contacts of the same relay.

5. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 1, characterized in that, Also includes: An environmental calibration unit is used to calibrate the charging safety testing equipment's measurement of environmental parameters.

6. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 1, characterized in that, Also includes: The display unit is used to display the detection data.

7. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 2, characterized in that, The fourth switch, the fifth switch, the sixth switch, and the seventh switch are all relays.

8. The calibration device for electric vehicle non-disassembly charging safety inspection equipment as described in claim 1, characterized in that, Also includes: The cabinet contains the control unit, the reverse power supply, the adjustable load unit, the first switch, the second switch, the third switch, the voltage sensor, and the current sensor. A fan is also installed inside the cabinet.

Images