CN112810470B - V2V quick charging system of vehicle-mounted charger and control method thereof - Google Patents

V2V quick charging system of vehicle-mounted charger and control method thereof Download PDF

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Publication number
CN112810470B
CN112810470B CN202110128659.5A CN202110128659A CN112810470B CN 112810470 B CN112810470 B CN 112810470B CN 202110128659 A CN202110128659 A CN 202110128659A CN 112810470 B CN112810470 B CN 112810470B
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vehicle
charging
discharging
module
power supply
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CN202110128659.5A
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CN112810470A (en
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冯颖盈
姚顺
徐金柱
吴沛东
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Shenzhen Vmax Power Co Ltd
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Shenzhen Vmax Power Co Ltd
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Priority to PCT/CN2021/097998 priority patent/WO2022160544A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B60L53/18—Cables specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention discloses a V2V quick charging system of a vehicle-mounted charger and a control method thereof, wherein the V2V quick charging system regulates the voltage of a battery and outputs the regulated voltage, and a quick charging cable comprises an on-cable control box, a quick charging interface and a slow charging interface which are arranged at two ends of the on-cable control box; the slow charging interface is inserted into the discharging trolley A, and the fast charging interface is inserted into the receiving trolley B; the discharging vehicle A is provided with a vehicle-mounted charger to obtain energy from a high-voltage battery pack of the discharging vehicle A, and the energy is regulated into high-voltage direct current requested by a receiving vehicle B through a V2V quick-acting system; the on-cable control box constructs a signal channel and a charging channel of the discharging vehicle A and the receiving vehicle B, and transmits the high-voltage direct current output by the discharging vehicle A to the receiving vehicle B; the invention is not needed to pass through the charging circuit of the streetcar B and is not limited by the power of the charging circuit of the streetcar B any more, can be compatible with the charging modules of the discharging vehicles A with various specifications, has the charging speed reaching the self maximum power of the discharging vehicles A, shortens the charging time, improves the charging efficiency and greatly reduces the charging loss.

Description

V2V quick charging system of vehicle-mounted charger and control method thereof
Technical Field
The invention relates to the technical field of electric vehicle charging and discharging, in particular to a circuit and a charging control method for a power battery of another vehicle by outputting high-voltage direct-current voltage when a vehicle-mounted charger works at V2V.
Background
When the vehicle works in a V2V mode, the discharging vehicle A inverts the voltage of the high-voltage battery pack into alternating current (AC 220V,50 Hz), the alternating current is input into the electric power receiving vehicle B through the discharging gun, and the electric power receiving vehicle B rectifies and boosts the AC alternating current and charges the power battery. Fig. 1 shows a conventional charging method in V2V mode: the charger A inverts the voltage of the battery pack into Alternating Current (AC) by the charger, the Alternating Current (AC) is output to the electric vehicle B through the discharging gun, and the electric vehicle B rectifies and boosts the Alternating Current (AC) into high-voltage direct current (HV) and then charges the power battery.
In the prior art, the V2V mode is limited by the power of a discharging end and a charging end, so that the rescue is slow, and the scene needing the rescue is an emergency situation mostly, so that a vehicle-mounted charger V2V quick-charging system with high charging speed and low loss and a control method thereof are urgently needed in the market to solve the current situation of delayed rescue of a new energy automobile.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a V2V quick charging system of a vehicle-mounted charger and a control method thereof.
The technical scheme adopted by the invention is that the V2V quick charging system of the vehicle-mounted charger comprises a discharging car A and a receiving car B, and also comprises a quick charging cable for connecting the discharging car A and the receiving car B; the quick charging cable comprises a slow charging interface, an on-cable control box and a quick charging interface which are sequentially connected, wherein the slow charging interface is used for being plugged in the discharging trolley A, and the quick charging interface is used for being plugged in the receiving trolley B; and the on-cable control box constructs a signal channel and a charging channel of the discharging vehicle A and the receiving vehicle B, and transmits the high-voltage direct current output by the discharging vehicle A to the receiving vehicle B.
The slow charging interface comprises 5 pins: connection confirmation CC, communication CP, direct current power supply positive DC +, direct current power supply negative DC-, and grounding PE; the slow charging interface is connected with a vehicle-mounted charging and discharging module in the discharging vehicle A, and the vehicle-mounted charging and discharging module is connected with a power battery in the discharging vehicle A.
Fill the interface soon and include 9 stitches: the method comprises the following steps of charging connection confirmation CC1, charging connection confirmation CC2, auxiliary power supply positive A +, auxiliary power supply positive A-, communication CAN +, communication CAN-, direct current power supply positive DC +, direct current power supply negative DC-and grounding PE; the quick charging interface is connected with a battery management module in the electric car B, and the battery management module is connected with a power battery in the electric car B.
The on-cable control box comprises a PWM signal generation module, a DCDC module, an MCU module and a high-voltage relay, wherein the input end of the DCDC module is connected with a direct-current power supply positive DC + and a direct-current power supply negative DC-pin of the slow charging interface, the output end of the DCDC module is connected with an auxiliary power supply positive A + and an auxiliary power supply positive A-pin of the fast charging interface so as to supply power to a battery management module of a powered vehicle B, and the DCDC module supplies power to the MCU module; the high-voltage relay is connected between a direct-current power supply positive DC + direct-current power supply negative DC-pin of the slow charging interface and a direct-current power supply positive DC + direct-current power supply negative DC-pin of the fast charging interface; the signal input end of the MCU module is connected with a communication CAN + and a communication CAN-pin of the quick charging interface, and controls the on-off of the high-voltage relay according to a signal sent by a battery management module of the streetcar B; the PWM signal generation module is controlled by the MCU module and sends a discharging instruction to the vehicle-mounted charging and discharging module of the discharging vehicle A through a communication CP pin of the slow charging interface; the connection in the interface of slowly filling confirms CC stitch and ground connection PE stitch and charge the connection in the interface of soon and confirm CC1 stitch charge connection and confirm CC2 stitch ground connection PE stitch all connect the ground of control box on the cable.
The DCDC module outputs 12V direct current to the positive A + of the auxiliary power supply and the positive A-pin of the auxiliary power supply.
The vehicle-mounted charging and discharging module comprises an input/output port, a bidirectional conversion unit, a DCDC unit and a controller, wherein the DCDC unit is connected with the power battery; the bidirectional conversion unit comprises a first switch Q1, a second switch Q2, a third switch Q3 and a fourth switch Q4, the first switch Q1 is connected between the C terminal and a positive electrode BUS + of the DCDC unit, the third switch Q3 is connected between the D terminal and a positive electrode BUS + of the DCDC unit, the second switch Q2 is connected between the C terminal and a negative electrode BUS-of the DCDC unit, the fourth switch Q4 is connected between the D terminal and a negative electrode BUS-of the DCDC unit, and the second capacitor C2 is connected between the positive electrode BUS + of the DCDC unit and the negative electrode BUS-of the DCDC unit.
The bidirectional conversion unit is controlled by the controller, can convert the alternating current or the direct current of the input/output port into the direct current and transmit the direct current to the DCDC unit, and can also convert the direct current of the DCDC unit into the alternating current or the direct current and transmit the alternating current or the direct current to the input/output port.
The invention also designs a control method of the V2V quick charging system of the vehicle-mounted charger, wherein the control method comprises the following steps:
step 1, connecting a discharging vehicle A and a receiving vehicle B by using the quick charging cable;
step 2, when the discharging vehicle A confirms that the slow charging interface is normally plugged through a CC pin through connection in the slow charging interface, the vehicle-mounted charging and discharging module outputs high-voltage direct current through a direct-current power supply positive DC + and a direct-current power supply negative DC-pin of the slow charging interface;
3, the on-cable control box DCDC module receives high-voltage direct current, and power supply conversion outputs 12V direct current to an auxiliary power supply positive A + and an auxiliary power supply positive A-pin through the module of the quick charging interface;
step 4, the electric vehicle B starts to work after obtaining the auxiliary power supply, and when the plug-in of the quick charging interface is confirmed to be normal through the charging connection confirmation CC1 pin and the charging connection confirmation CC2 pin of the quick charging interface, charging request information is sent through the communication CAN + and communication CAN-pins of the quick charging interface;
step 5, after receiving the charging request information, the MCU module controls the PWM signal generation module to convert the charging request information into a PWM signal and sends out the PWM signal through a communication CP pin of the slow charging interface;
step 6, the discharging vehicle A controller analyzes the PWM signal, acquires charging request information of a receiving vehicle B, and controls a vehicle-mounted charging and discharging module to adjust the high-voltage direct current;
and 7, the MCU module controls the high-voltage relay to be closed, and the discharging vehicle A charges the power receiving vehicle B with high-voltage direct current.
The charging request information includes a charging voltage value and a charging current value.
The technical scheme provided by the invention has the beneficial effects that:
the high-voltage direct current output by the vehicle-mounted charger of the discharging vehicle A is adopted to charge the high-voltage battery of the receiving vehicle B, the charging circuit of the receiving vehicle B is not needed, the power of the charging circuit of the receiving vehicle B is not limited, the charging module of the discharging vehicle A with various specifications can be compatible, the charging speed reaches the maximum power of the discharging vehicle A, the charging time is shortened, the charging efficiency is improved, and the charging loss is greatly reduced.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic block diagram of a conventional V2V mode charging;
FIG. 2 is a charging schematic block diagram of the present invention;
FIG. 3 is a schematic of the on-cable control box circuit of the present invention;
FIG. 4 is a schematic diagram of the vehicle-mounted charger outputting alternating current through the bidirectional conversion unit;
FIG. 5 is a schematic diagram of the vehicle-mounted charger outputting direct current through the bidirectional conversion unit;
FIG. 6 is a block flow diagram of the preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the traditional V2V mode, the discharging vehicle needs to invert the battery voltage into ac power for output, and the receiving vehicle needs to rectify and boost the ac power into dc high-voltage power to charge the power battery. Obviously, the step of inverting to alternating current is an omissible step, and the charging vehicle requires a direct current high voltage power supply capable of charging the power battery. The invention upgrades the charging scheme of V2V based on the defect, and the part that the discharging end is inverted into alternating current and the vehicle end is rectified into direct current is cancelled, and the high-voltage direct current is directly transmitted from the discharging vehicle to the charging vehicle for rescue charging.
The charging and discharging module of the discharging end and the charging module of the charging end are required to participate in the charging process simultaneously in the traditional V2V process, the charging power is limited by the power of the two modules, for example, the discharging module is 44KW, the charging module is 7KW, and the charging process can only be 7KW at most. Most of the rescue vehicles at the discharging end select modules with large power, so that the power of the charging end is limited, and the charging process is slow.
In the invention, the vehicle-mounted charger of the discharging vehicle outputs high-voltage direct current to charge the battery of the electric-receiving vehicle without passing through a charging circuit of the electric-receiving vehicle, so that the vehicle is not limited by the power of the charging module when the voltage is V2V, and the vehicle can be compatible with the charging modules with various specifications, and the charging speed reaches the maximum power of the discharging vehicle.
Fig. 2 is a block diagram of the charging principle of the present invention, in which the battery pack voltage of the charger on the discharging vehicle a is boosted by the internal circuit and then output in the form of high voltage direct current (HV) without inversion processing, and then input to the fast charging port of the receiving vehicle B through the discharging gun to charge the power battery of the receiving vehicle B.
The invention discloses a V2V quick charging system of a vehicle-mounted charger, which comprises a discharging car A and a receiving car B, and also comprises a quick charging cable for connecting the discharging car A and the receiving car B; the quick charging cable comprises a slow charging interface, an on-cable control box and a quick charging interface which are sequentially connected, wherein the slow charging interface is used for being plugged in the discharging trolley A, and the quick charging interface is used for being plugged in the receiving trolley B; and the on-cable control box constructs a signal channel and a charging channel of the discharging vehicle A and the receiving vehicle B, and transmits the high-voltage direct current output by the discharging vehicle A to the receiving vehicle B.
Referring to the preferred embodiment shown in fig. 3, the slow fill interface includes 5 pins: connection confirmation CC, communication CP, direct current power supply positive DC +, direct current power supply negative DC-, and grounding PE; the slow charging interface is connected with a vehicle-mounted charging and discharging module in the discharging vehicle A, and the vehicle-mounted charging and discharging module is connected with a power battery in the discharging vehicle A.
Referring to the preferred embodiment shown in fig. 3, the quick charging interface comprises 9 pins: a charging connection confirmation CC1, a charging connection confirmation CC2, an auxiliary power supply positive A +, an auxiliary power supply positive A-, a communication CAN +, a communication CAN-, a direct current power supply positive DC +, a direct current power supply negative DC-, and a grounding PE; the quick charging interface is connected with a battery management module in the electric car B, and the battery management module is connected with a power battery in the electric car B.
Referring to fig. 3, a schematic circuit diagram of the on-cable control box of the present invention is shown, where the on-cable control box includes a PWM signal generation module, a DCDC module, an MCU module, and a high-voltage relay, where an input terminal of the DCDC module is connected to a positive DC + and a negative DC-pin of the DC power supply of the slow charging interface, and an output terminal thereof is connected to a positive a + and a positive a-pin of the auxiliary power supply of the fast charging interface, and the DCDC module supplies power to the MCU module; the high-voltage relay is connected between a direct-current power supply positive DC + direct-current power supply negative DC-pin of the slow charging interface and a direct-current power supply positive DC + direct-current power supply negative DC-pin of the fast charging interface; the signal input end of the MCU module is connected with a communication CAN + and a communication CAN-pin of the quick charging interface, and the on-off of the high-voltage relay is controlled according to signals in the communication CAN + and the communication CAN-pin; the PWM signal generating module is controlled by the MCU module and sends a discharging instruction to the discharging vehicle A through a communication CP pin of the slow charging interface; the connection in the interface of slowly filling confirms CC stitch and ground connection PE stitch and charge the connection in the interface of soon and confirm CC1 stitch charge connection and confirm CC2 stitch ground connection PE stitch all connect the ground of control box on the cable.
The DCDC module outputs 12V direct current to an auxiliary power supply positive A + pin and an auxiliary power supply positive A-pin. The control system of the power receiving vehicle B normally operates when the auxiliary power supply is obtained, and sends the charging request information to the discharging vehicle a.
In actual work, a DCDC circuit in the vehicle-mounted charger can output alternating current and also can output direct current. The following description will use the circuit of the attached drawings to illustrate how the vehicle-mounted charger works when the circuit outputs Alternating Current (AC) and high-voltage direct current (HV) respectively when the vehicle-mounted charger works in the inverter mode.
The vehicle-mounted charging and discharging module comprises an input/output port, a bidirectional conversion unit, a DCDC unit and a controller, wherein the DCDC unit is connected with the power battery; the bidirectional conversion unit comprises a first switch Q1, a second switch Q2, a third switch Q3 and a fourth switch Q4, the first switch Q1 is connected between the C terminal and a positive electrode BUS + of the DCDC unit, the third switch Q3 is connected between the D terminal and a positive electrode BUS + of the DCDC unit, the second switch Q2 is connected between the C terminal and a negative electrode BUS-of the DCDC unit, the fourth switch Q4 is connected between the D terminal and a negative electrode BUS-of the DCDC unit, and the second capacitor C2 is connected between the positive electrode BUS + of the DCDC unit and the negative electrode BUS-of the DCDC unit.
The bidirectional conversion unit is controlled by the controller, can convert the alternating current or the direct current of the input/output port into the direct current and transmit the direct current to the DCDC unit, and can also convert the direct current of the DCDC unit into the alternating current or the direct current and transmit the alternating current or the direct current to the input/output port.
Fig. 4 is a schematic diagram of the vehicle-mounted charger outputting alternating current through the bidirectional conversion unit, the bidirectional conversion unit raises the voltage of the battery pack to form high-voltage direct-current voltage at two ends of the capacitor, and the PFC loop performs a chopping function in an inversion mode. The solid arrows indicate the flow of current when Q1 and Q4 are turned on, and the voltage L > the voltage N. The dashed arrows indicate the flow of current when Q2 and Q3 are on, and the voltage L < voltage N. The power tubes Q3 and Q4 are alternately started at a common frequency, namely, the dotted line arrows and the solid line arrows are complementarily staggered at a frequency of 50Hz to convert the direct-current voltage into the alternating-current square wave voltage, and the voltage is regulated into a sine wave by the power tubes Q1 and Q2. Finally, the alternating current voltage of 220V50Hz is output.
Fig. 5 is a schematic diagram of the vehicle-mounted charger outputting direct current through the bidirectional conversion unit, the bidirectional conversion unit raises the voltage of the battery pack, the Q3 and Q4 tubes are not turned on alternately any more, the Q4 is fixed to be turned on, the Q1 is controlled to be turned on by PWM, and the dc high voltage is output by regulating the voltage through the BUCK circuit formed by combining the inductance and the capacitance.
The invention also discloses a control method of the vehicle-mounted charger V2V quick charging system, the vehicle-mounted charger V2V quick charging system of the quick charging system refers to a flow chart of a preferred embodiment of the invention shown in figure 6, and the control method comprises the following steps:
step 1, connecting a discharging vehicle A and a receiving vehicle B by using the quick charging cable;
step 2, when the discharging vehicle A confirms that the slow charging interface is normally plugged through a CC pin through connection in the slow charging interface, the vehicle-mounted charging and discharging module outputs high-voltage direct current through a direct-current power supply positive DC + and a direct-current power supply negative DC-pin of the slow charging interface;
3, the on-cable control box DCDC module receives high-voltage direct current, and power supply conversion outputs 12V direct current to an auxiliary power supply positive A + and an auxiliary power supply positive A-pin through the module of the quick charging interface;
step 4, the electric vehicle B starts to work after obtaining the auxiliary power supply, and when the plug-in of the quick charging interface is confirmed to be normal through the charging connection confirmation CC1 pin and the charging connection confirmation CC2 pin of the quick charging interface, charging request information is sent through the communication CAN + and communication CAN-pins of the quick charging interface;
step 5, after receiving the charging request information, the MCU module controls the PWM signal generation module to convert the charging request information into a PWM signal and sends out the PWM signal through a communication CP pin of the slow charging interface;
step 6, the controller of the discharge car A analyzes the PWM signal, acquires the charging request information of the current-receiving car B, and controls the vehicle-mounted charging and discharging module to adjust the high-voltage direct current;
and 7, the MCU module controls the high-voltage relay to be closed, and the discharging vehicle A charges the power receiving vehicle B with high-voltage direct current.
In a preferred embodiment, the charging request information includes a charging voltage value and a charging current value.
The present invention includes but is not limited to examples. The other topological circuits can realize the direct current output function or bypass the inverter circuit, and the mode of outputting high-voltage direct current voltage is included in the scheme.

Claims (8)

1. A vehicle-mounted charger V2V quick charging system comprises a discharging vehicle A and a receiving vehicle B, and is characterized by further comprising a quick charging cable for connecting the discharging vehicle A and the receiving vehicle B; the quick charging cable comprises a slow charging interface, an on-cable control box and a quick charging interface which are sequentially connected, wherein
The slow charging interface is used for being plugged with a discharging trolley A, and the fast charging interface is used for being plugged with a receiving trolley B;
the discharging car A can output alternating current and also can output direct current; the on-cable control box constructs a signal channel and a charging channel of the discharging vehicle A and the receiving vehicle B, and transmits the high-voltage direct current output by the discharging vehicle A to the receiving vehicle B;
the slow charging interface comprises 5 pins: connection confirmation CC, communication CP, direct current power supply positive DC +, direct current power supply negative DC-, and grounding PE; the slow charging interface is connected with a vehicle-mounted charging and discharging module in the discharging vehicle A, and the vehicle-mounted charging and discharging module is connected with a power battery in the discharging vehicle A.
2. The vehicle-mounted charger V2V quick charging system according to claim 1, wherein the quick charging interface comprises 9 pins: the method comprises the following steps of charging connection confirmation CC1, charging connection confirmation CC2, auxiliary power supply positive A +, auxiliary power supply positive A-, communication CAN +, communication CAN-, direct current power supply positive DC +, direct current power supply negative DC-and grounding PE; the quick charging interface is connected with a battery management module in the trolley B, and the battery management module is connected with a power battery in the trolley B.
3. The V2V quick charging system of the vehicle-mounted charger according to claim 2, wherein the on-cable control box comprises a PWM signal generation module, a DCDC module, an MCU module and a high-voltage relay, wherein the on-cable control box comprises a PWM signal generation module, a DCDC module, a MCU module and a high-voltage relay
The input end of the DCDC module is connected with a direct-current power supply positive DC + and a direct-current power supply negative DC-pin of the slow charging interface, the output end of the DCDC module is connected with an auxiliary power supply positive A + and an auxiliary power supply positive A-pin of the fast charging interface so as to supply power to a battery management module of a powered vehicle B, and the DCDC module supplies power to the MCU module;
the high-voltage relay is connected between a direct-current power supply positive DC + direct-current power supply negative DC-pin of the slow charging interface and a direct-current power supply positive DC + direct-current power supply negative DC-pin of the fast charging interface;
the signal input end of the MCU module is connected with a communication CAN + and a communication CAN-pin of the quick charging interface, and controls the on-off of the high-voltage relay according to a signal sent by a battery management module of the streetcar B;
the PWM signal generation module is controlled by the MCU module and sends a discharging instruction to the vehicle-mounted charging and discharging module of the discharging vehicle A through a communication CP pin of the slow charging interface;
the connection in the slow charging interface confirms CC stitch and grounding PE stitch, and the charging connection in the fast charging interface confirms CC1 stitch charging connection and confirms CC2 stitch grounding PE stitch to be connected with the ground of the on-cable control box.
4. The vehicle-mounted charger V2V quick charging system according to claim 3, wherein the DCDC module outputs 12V direct current to the auxiliary power supply positive A + and the auxiliary power supply positive A-pin.
5. The vehicle-mounted charger V2V quick charging system according to claim 1, wherein the vehicle-mounted charging and discharging module comprises an input/output port, a bidirectional conversion unit, a DCDC unit and a controller, and the DCDC unit is connected with the power battery; the bidirectional conversion unit comprises a first switch Q1, a second switch Q2, a third switch Q3 and a fourth switch Q4, the first switch Q1 is connected between the C terminal and a positive electrode BUS + of the DCDC unit, the third switch Q3 is connected between the D terminal and a positive electrode BUS + of the DCDC unit, the second switch Q2 is connected between the C terminal and a negative electrode BUS-of the DCDC unit, the fourth switch Q4 is connected between the D terminal and a negative electrode BUS-of the DCDC unit, and the second capacitor C2 is connected between the positive electrode BUS + of the DCDC unit and the negative electrode BUS-of the DCDC unit.
6. The vehicle-mounted charger V2V quick charging system according to claim 5, wherein the bidirectional conversion unit is controlled by the controller, and can convert the AC or DC power at the input/output port into DC power to be transmitted to the DCDC unit, and can also convert the DC power at the DCDC unit into AC or DC power to be transmitted to the input/output port.
7. A control method of a V2V quick charging system of a vehicle-mounted charger is characterized in that the quick charging system is the V2V quick charging system of the vehicle-mounted charger according to any one of claims 1 to 6, and the control method comprises the following steps:
step 1, connecting a discharging vehicle A and a receiving vehicle B by using the quick charging cable;
step 2, when the discharging vehicle A confirms that the slow charging interface is normally plugged through a CC pin through connection in the slow charging interface, the vehicle-mounted charging and discharging module outputs high-voltage direct current through a direct-current power supply positive DC + and a direct-current power supply negative DC-pin of the slow charging interface;
step 3, the on-cable control box DCDC module receives high-voltage direct current, and 12V direct current is output to an auxiliary power supply positive A + and an auxiliary power supply positive A-pin through power conversion through the module of the quick charging interface;
step 4, the electric vehicle B starts to work after obtaining the auxiliary power supply, and when the CC1 pin and the CC2 pin of the quick charging interface are confirmed to be normally plugged through the charging connection of the quick charging interface, charging request information is sent through the communication CAN + and the communication CAN-pin of the quick charging interface;
step 5, after receiving the charging request information, the MCU module controls the PWM signal generation module to convert the charging request information into a PWM signal and sends out the PWM signal through a communication CP pin of the slow charging interface;
step 6, the controller of the discharge car A analyzes the PWM signal, acquires the charging request information of the current-receiving car B, and controls the vehicle-mounted charging and discharging module to adjust the high-voltage direct current;
and 7, the MCU module controls the high-voltage relay to be closed, and the discharging vehicle A charges the receiving vehicle B by high-voltage direct current.
8. The method as claimed in claim 7, wherein the charging request information includes a charging voltage value and a charging current value.
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