Pick-and-discharge integrated device of pure electric vehicle
By designing an integrated device for pick-up and discharge in pure electric vehicles, using the DC charging port to collect power and convert it into AC power, and discharging it externally, it solves the needs of large electricity and high-power electricity and the DC charging problems of commercial vehicles, achieving strong compatibility and efficient power supply.
Patent Information
- Application Number
- CN202420856979.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-24
AI Technical Summary
The power batteries of existing pure electric vehicles cannot meet the AC power demand of high-voltage and high-power, especially in places where there is no supply of municipal electricity. Commercial vehicles are usually not equipped with on-board charging units and cannot discharge externally through DC charging.
Design an integrated device for pick-up and discharge of pure electric vehicles, draw power through the DC charging port of the vehicle, and convert DC into AC power for external discharge, including a national standard DC charging gun on the input side, high-voltage manual switch, DC contactor, input measurement module , discharge module, output fuse, output measurement module, output AC contactor at the output, main control module, auxiliary power DC relay, bidirectional DCDC module, manual start and stop switch, low voltage battery, cooling fan, remote communication module and human-computer interaction module , realize the AC output of DC power.
The device can meet the user's high-voltage and high-power AC power needs, is compatible with electric vehicles with fast charging interface, and can draw power from the DC charging ports of passenger cars and commercial vehicles. It has strong compatibility and solves the problem of current There are technologies that cannot meet the problem of high-power power supply.
Smart Images
Figure CN222169372U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of charging and discharging of power batteries of electric vehicles, in particular to an integrated charging and discharging device of a pure electric vehicle. Background Art
[0002] With the continuous maturity of electric vehicle technology and the continuous increase in volume in my country, its attributes are no longer limited to transportation. For example, in some places where there is no mains supply, when AC mains is needed, the power battery of the electric vehicle can be used to output AC power for users. At present, most pure electric passenger cars have this function. However, due to the limitations of vehicle size and layout space, the amount of electricity loaded in passenger cars is generally not large, usually tens of kilowatt-hours. When users have a large demand for electricity, passenger cars will not be able to meet the power supply demand. At present, my country's commercial vehicle technology is developing rapidly, and the number of vehicles in use is also growing. For example, buses, light logistics vehicles, and heavy logistics vehicles can easily load nearly 100 kilowatt-hours or even hundreds of kilowatt-hours of electricity. When users have a large demand for electricity, they can also easily cope with it.
[0003] The existing devices for discharging power from the power battery of electric vehicles all draw power from the AC charging port of the vehicle and use the vehicle's own on-board charging unit. With current technology, these on-board charging units can be easily designed into a bidirectional AC charging mode, that is, they can convert the external AC mains into DC power to charge the power battery during charging, and can also convert the DC power of the power battery into AC power during discharge and release the AC power to the outside through the AC charging port in reverse for external electrical appliances. The conversion power of the vehicle's own bidirectional AC charging module is generally only a few kilowatts, and the common ones are 3.3 kilowatts and 6.6 kilowatts. When users need more than ten kilowatts or even tens of kilowatts of power supply, this method is obviously unable to meet the needs. At the same time, when the user's demand for power is large and the power loaded in the passenger car cannot meet the power demand, if the battery of a commercial vehicle is used for discharge, a new problem will be faced, that is, commercial vehicles are generally not equipped with on-board charging units, and most of them use DC charging, so they cannot be discharged to the outside in a similar way to passenger cars.
[0004] Therefore, those skilled in the art provide an integrated charging and discharging device for a pure electric vehicle to solve the problems raised in the above background technology. Utility Model Content
[0005] The purpose of the utility model is to provide an integrated device for charging and discharging a pure electric vehicle, which draws power through the DC charging port of the vehicle and converts the DC power obtained from the DC charging port into AC power for external discharge to meet the user's needs for large-capacity and high-power AC power consumption, so as to solve the problems raised in the above-mentioned background technology.
[0006] A charging and discharging integrated device for a pure electric vehicle, comprising a national standard DC charging gun on the input side; a high-voltage manual switch; a DC contactor; an input measurement module; an input fuse; a discharge module; an output fuse; an output measurement module; an output AC contactor; a voltage measurement module; an AC output interface; a main control module; an auxiliary power supply DC relay; a bidirectional DCDC module; a manual start-stop switch; a low-voltage battery; a cooling fan; a remote communication module; and a human-computer interaction module. The national standard DC charging gun on the input side complies with the Chinese DC charging gun standard, and the two terminals "DC+" and "DC-" are electrically connected to one end of the high-voltage manual switch, respectively, and the "PE" terminal is connected to the ground wire; the two terminals "A+" and "A-" are electrically connected to one end of the normally open contact of the auxiliary power supply DC relay, respectively; the three terminals "S+", "S-", and "CC1" are electrically connected to the main control module, respectively;
[0007] The other end of the high-voltage manual switch is electrically connected to one end of the normally open contact of the DC contactor, and the other end of the normally open contact of the DC contactor is electrically connected to the input end of the input measurement module; the output end of the input measurement module, the positive pole is electrically connected to one end of the input fuse, and the negative pole is electrically connected to the input negative end of the discharge module and the negative end of the bidirectional DCDC module; the other end of the input fuse is electrically connected to the input positive end of the discharge module and the positive end of the bidirectional DCDC module; the AC output end of the discharge module is electrically connected to one end of the output fuse and the input end of the output detection module; the other end of the output fuse is electrically connected to the input end of the output measurement module; the output end of the output measurement module is electrically connected to one end of the normally open contact of the output end AC contactor; the other end of the normally open contact of the output end AC contactor is electrically connected to the voltage measurement module; the other end of the normally open contact of the output end AC contactor is electrically connected to the terminal of the AC output interface.
[0008] As a further solution of the utility model: the other end of the normally open contact of the auxiliary power supply DC relay is negatively grounded, and the positive electrode is electrically connected to the output end of the manual start-stop switch.
[0009] As a further solution of the utility model: the negative electrode of the low-voltage battery is grounded, and the positive electrode is electrically connected to the positive electrode of the low-voltage end of the bidirectional DCDC module, and the positive electrode is electrically connected to the input end of the manual start-stop switch; the negative electrode of the low-voltage end of the bidirectional DCDC module is grounded.
[0010] As a further solution of the utility model: the cooling fan, the remote communication module, and the human-computer interaction module all draw power from the output end of the manual start-stop switch, the control end of the cooling fan is electrically connected to the main control module, and the start, stop, and speed are controlled by the main control module. The remote communication module and the main control module use data communication to upload local information obtained from the main control module to the operation platform. The human-computer interaction module and the main control module use data communication, and interactive operations between people and equipment can be realized on the human-computer interaction module.
[0011] As a further solution of the utility model: the on and off of the DC contactor, the output end AC contactor, and the auxiliary power supply DC relay are all controlled by the main control module.
[0012] As a further solution of the utility model: the function of the discharge module is to isolate the DC power at the input end and convert it into AC power output. Multiple modules can be used in parallel to increase the output power, and exchange data with the main control module through CAN communication.
[0013] As a further solution of the utility model: the input measurement module includes an insulation detection function, a discharge circuit, a current sampling function, and a voltage sampling function, and exchanges information with the main control module 12 through CAN communication; the output measurement module includes a leakage detection function, a current sampling function, and a voltage sampling function, and exchanges information with the main control module through CAN communication; the voltage measurement module is used to sample the output voltage.
[0014] As a further solution of the utility model: the bidirectional DCDC module is controlled by the main control module, and can convert the high-voltage direct current from the vehicle power battery into low-voltage electricity to charge the low-voltage battery, and can also convert the low-voltage direct current of the low-voltage battery into high-voltage electricity and output it to the DC high-voltage circuit for the normal operation of the insulation detection function.
[0015] The utility model provides an integrated device for taking in electricity through a DC charging port of a vehicle and converting the DC electricity obtained from the DC charging port into AC electricity for external discharge, so as to meet the user's demand for large-capacity and high-power AC electricity. The device is compatible with electric vehicles with fast charging interfaces and is not limited to whether the vehicle is equipped with a bidirectional on-board charging unit. Therefore, it can take electricity not only from the DC charging port of a passenger car, but also from the DC charging port of a commercial vehicle, and has strong compatibility. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] In the figure: 1. National standard DC charging gun on the input side; 2. High-voltage manual switch; 3. DC contactor; 4. Input measurement module; 5. Input fuse; 6. Discharge module; 7. Output fuse; 8. Output measurement module; 9. Output AC contactor; 10. Voltage measurement module; 11. AC output interface; 12. Main control module; 13. Auxiliary power supply DC relay; 14. Bidirectional DCDC module; 15. Manual start-stop switch; 16. Low-voltage battery; 17. Cooling fan; 18. Remote communication module; 19. Human-computer interaction module. DETAILED DESCRIPTION
[0018] See also Figure 1 In the embodiment of the utility model, a charging and discharging integrated device for a pure electric vehicle includes a national standard DC charging gun 1 on the input side; a high-voltage manual switch 2; a DC contactor 3; an input measurement module 4; an input fuse 5; a discharge module 6; an output fuse 7; an output measurement module 8; an output AC contactor 9; a voltage measurement module 10; an AC output interface 11; a main control module 12; an auxiliary power supply DC relay 13; a bidirectional DCDC module 14; a manual start-stop switch 15; a low-voltage battery 16; a cooling fan 17; a remote communication module 18; and a human-computer interaction module 19. The national standard DC charging gun 1 on the input side complies with the Chinese DC charging gun standard, and the two terminals "DC+" and "DC-" are electrically connected to one end of the high-voltage manual switch 2, respectively, and the "PE" terminal is connected to the ground wire; the two terminals "A+" and "A-" are electrically connected to one end of the normally open contact of the auxiliary power supply DC relay 13, respectively; the three terminals "S+", "S-", and "CC1" are electrically connected to the main control module 12, respectively;
[0019] The other end of the high-voltage manual switch 2 is electrically connected to one end of the normally open contact of the DC contactor 3, and the other end of the normally open contact of the DC contactor 3 is electrically connected to the input end of the input measurement module 4; the output end of the input measurement module 4, the positive pole is electrically connected to one end of the input fuse 5, and the negative pole is electrically connected to the input negative end of the discharge module 6 and the negative end of the bidirectional DCDC module 14; the other end of the input fuse 5 is electrically connected to the input positive end of the discharge module 6 and the positive end of the bidirectional DCDC module 14; the AC output end of the discharge module 6 is electrically connected to one end of the output fuse 7 and the input end of the output detection module; the other end of the output fuse 7 is electrically connected to the input end of the output measurement module 8; the output end of the output measurement module 8 is electrically connected to one end of the normally open contact of the output end AC contactor 9; the other end of the normally open contact of the output end AC contactor 9 is electrically connected to the voltage measurement module 10; the other end of the normally open contact of the output end AC contactor 9 is electrically connected to the terminal of the AC output interface 11.
[0020] Among them, the other end of the normally open contact of the auxiliary power supply DC relay 13 is grounded at a negative pole, and the positive pole is electrically connected to the output end of the manual start-stop switch 15.
[0021] Among them, the negative pole of the low-voltage battery 16 is grounded, and the positive pole is electrically connected to the positive pole of the low-voltage end of the bidirectional DCDC module 14 and the positive pole is electrically connected to the input end of the manual start-stop switch 15; the negative pole of the low-voltage end of the bidirectional DCDC module 14 is grounded.
[0022] Among them, the cooling fan 17, the remote communication module 18, and the human-computer interaction module 19 all draw power from the output end of the manual start-stop switch 15. The control end of the cooling fan 17 is electrically connected to the main control module 12, and the start, stop, and speed are controlled by the main control module 12. The remote communication module 18 and the main control module 12 use data communication to upload local information obtained from the main control module 12 to the operation platform. The human-computer interaction module 19 and the main control module 12 use data communication, and interactive operations between people and equipment can be realized on the human-computer interaction module 19.
[0023] Among them, the on and off of the DC contactor 3 , the output end AC contactor 9 , and the auxiliary power supply DC relay 13 are all controlled by the main control module 12 .
[0024] The function of the discharge module 6 is to isolate the DC power at the input end and convert it into AC power output. Multiple modules can be used in parallel to increase the output power, and exchange data with the main control module 12 through CAN communication.
[0025] Among them, the input measurement module 4 includes insulation detection function, discharge circuit, current sampling function, and voltage sampling function, and exchanges information with the main control module 12 through CAN communication. The output measurement module 8 includes leakage detection function, current sampling function, and voltage sampling function, and exchanges information with the main control module 12 through CAN communication. The voltage measurement module 10 is used to sample the output voltage.
[0026] Among them, the bidirectional DCDC module 14 is controlled by the main control module 12, and can convert the high-voltage direct current from the vehicle power battery into low-voltage electricity to charge the low-voltage battery 16, and can also convert the low-voltage direct current of the low-voltage battery 16 into high-voltage electricity and output it to the DC high-voltage circuit for the normal operation of the insulation detection function.
[0027] In this embodiment, an integrated device for drawing electricity through a DC charging port of a vehicle and converting the DC electricity obtained from the DC charging port into AC electricity for external discharge is provided to meet the user's demand for large-capacity and high-power AC electricity. The device is compatible with electric vehicles with fast charging interfaces, and is not limited to whether the vehicle has its own bidirectional on-board charging unit. Therefore, it can draw electricity not only from the DC charging port of a passenger car, but also from the DC charging port of a commercial vehicle, and has strong compatibility.
[0028] The working principle of the utility model is:
[0029] 1. Start-up phase
[0030] ①. Insert the input-side national standard DC charging gun 1 into the DC charging socket of the electric vehicle used for discharge, turn on the high-voltage manual switch 2, turn on the manual start-stop switch 15, and then the low-voltage battery 16 supplies power to the main control module 12. The main control module 12 controls the auxiliary power supply DC relay 13 to turn on, and provides auxiliary power to the A+ and A- of the electric vehicle connected to the input-side national standard DC charging gun 1.
[0031] ②. The main control module 12 controls the input measurement module 4 to open, the main control module 12 controls the DC contactor 3 to connect, the main control module 12 controls the bidirectional DCDC module 14 to be in a boost state, and the input measurement module 4 performs insulation detection. After the insulation detection is completed, the DC contactor 3 is controlled to be disconnected, and the bidirectional DCDC module 14 is controlled to be in a closed state, and then the DC contactor 3 is controlled to be connected; at this time, the discharge module 6 and the bidirectional DCDC module 14 simultaneously obtain high voltage electricity, and the main control module 12 communicates with the input side electric vehicle through S+ and S- to exchange CAN communication information, and obtains the vehicle VIN code, the total voltage of the power battery, the single cell voltage, the current SOC, the allowable discharge current and other information; the bidirectional DCDC module 14 outputs low voltage electricity to charge the low-voltage battery 16, and provides low-voltage power to the equipment at the same time.
[0032] 2. Discharge stage
[0033] The main control module 12 controls the discharge module 6 to output AC power and controls the output AC contactor 9 to be turned on. At the same time, the output measurement module 8 performs leakage detection. Once the leakage current does not meet the safety requirements, the output AC contactor 9 is controlled to be disconnected to cut off the AC power output to ensure safe use of electricity.
[0034] 3. Electricity Measurement
[0035] The main control module 12 uses the voltage and current values collected by the output measurement module 8 and the voltage measurement module 10 to calculate the cumulative output power and monitor the current discharge power and voltage in real time.
[0036] 4. Stop Control
[0037] The system can be stopped by cutting off the manual start-stop switch 15. In an emergency, the system can also be stopped by directly cutting off the high-voltage manual switch 2.
[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A charging and discharging integrated device for a pure electric vehicle, comprising a national standard DC charging gun (1) on the input side; a high-voltage manual switch (2); a DC contactor (3); an input measurement module (4); an input fuse (5); a discharge module (6); an output fuse (7); an output measurement module (8); an output AC contactor (9); a voltage measurement module (10); an AC output interface (11); a main control module (12); an auxiliary power supply DC relay (13); a bidirectional DCDC module (14); a manual start-stop switch (15); a low-voltage battery (16); a cooling fan (17); a remote communication module (18); and a human-computer interaction module (19), characterized in that: The national standard DC charging gun (1) on the input side complies with the Chinese DC charging gun standard, the two terminals "DC+" and "DC-" are electrically connected to one end of the high-voltage manual switch (2), and the "PE" terminal is connected to the ground wire; the two terminals "A+" and "A-" are electrically connected to one end of the normally open contact of the auxiliary power supply DC relay (13); the three terminals "S+", "S-", and "CC1" are electrically connected to the main control module (12) respectively; The other end of the high-voltage manual switch (2) is electrically connected to one end of the normally open contact of the DC contactor (3), and the other end of the normally open contact of the DC contactor (3) is electrically connected to the input end of the input measurement module (4); the output end of the input measurement module (4), the positive pole is electrically connected to one end of the input fuse (5), and the negative pole is electrically connected to the input negative end of the discharge module (6) and the negative end of the bidirectional DCDC module (14); the other end of the input fuse (5) is electrically connected to the input positive end of the discharge module (6) and the positive end of the bidirectional DCDC module (14). ; The AC output end of the discharge module (6) is electrically connected to one end of the output fuse (7) and the input end of the output detection module respectively; the other end of the output fuse (7) is electrically connected to the input end of the output measurement module (8); the output end of the output measurement module (8) is electrically connected to one end of the normally open contact of the output end AC contactor (9); the other end of the normally open contact of the output end AC contactor (9) is electrically connected to the voltage measurement module (10); the other end of the normally open contact of the output end AC contactor (9) is electrically connected to the terminal of the AC output interface (11).
2. The integrated charging and discharging device of a pure electric vehicle according to claim 1, characterized in that: The other end of the normally open contact of the auxiliary power supply DC relay (13) is negatively grounded, and the positive electrode is electrically connected to the output end of the manual start-stop switch (15).
3. The integrated charging and discharging device of a pure electric vehicle according to claim 1, characterized in that: The negative electrode of the low-voltage storage battery (16) is grounded, and the positive electrode is electrically connected to the positive electrode of the low-voltage end of the bidirectional DCDC module (14), and the positive electrode is electrically connected to the input end of the manual start-stop switch (15); the negative electrode of the low-voltage end of the bidirectional DCDC module (14) is grounded.
4. The integrated charging and discharging device of a pure electric vehicle according to claim 1, characterized in that: The cooling fan (17), the remote communication module (18), and the human-machine interaction module (19) all draw power from the output end of the manual start-stop switch (15); the control end of the cooling fan (17) is electrically connected to the main control module (12); the start, stop, and speed are controlled by the main control module (12); the remote communication module (18) and the main control module (12) use data communication to upload local information obtained from the main control module (12) to the operation platform; the human-machine interaction module (19) and the main control module (12) use data communication to realize interactive operations between people and equipment on the human-machine interaction module (19).
5. The integrated charging and discharging device of a pure electric vehicle according to claim 1, characterized in that: The on and off of the DC contactor (3), the output end AC contactor (9), and the auxiliary power supply DC relay (13) are all controlled by the main control module (12).
6. The integrated charging and discharging device of a pure electric vehicle according to claim 1, characterized in that: The function of the discharge module (6) is to isolate the direct current at the input end and convert it into alternating current output.