Extended-range vehicle-to-vehicle charging system and method, discharging vehicle and charging vehicle

Abstract

The invention discloses an extended-range vehicle-to-vehicle charging system and method, a discharging vehicle and a charging vehicle, and belongs to the technical field of vehicle charging. A vehicle-to-vehicle charging wire harness in the system is used for connecting a first direct-current charging socket and a second direct-current charging socket; a main negative contactor in the system is used for disconnecting a rechargeable energy storage module from a charging vehicle; a generator controller in the system is connected with a range extender through a high-voltage three-phase wire harness and used for converting three-phase alternating current output by the range extender into direct current; a fast charging contactor in the system is used for transmitting charging current output by a range extender to a second direct current charging socket through a vehicle-to-vehicle charging wire harness connected with a first direct current charging socket. By adopting the system, direct-current charging can be directly carried out on the vehicle through the range extender, and the charging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging, and in particular to a range-extended vehicle-to-vehicle charging system and method, a discharging vehicle, and a charging vehicle. Background Art

[0002] With the development of new energy vehicles and intelligent network connection technology, there are more and more new energy vehicles on the market, charging queues often occur, and the load on the power grid has become unbearable, and the demand for diversified energy replenishment solutions has increased. In related technologies, passenger cars or light commercial vehicles are equipped with on-board chargers. Through the inverter function of the on-board charger, the power energy of the power battery in the new energy vehicle can be inverted into 220V AC power through the on-board charger to replenish energy for new energy vehicles or provide electricity for daily life. However, heavy-duty new energy commercial vehicles are not equipped with on-board chargers, and cannot be replenished through inversion. In addition, the battery power of heavy-duty new energy commercial vehicles is relatively large. Using 220V AC to charge heavy-duty new energy commercial vehicles requires a long charging time and a low charging rate. Summary of the invention

[0003] Based on this, it is necessary to provide a range-extended vehicle-to-vehicle charging system and method, a discharging vehicle, and a charging vehicle that can quickly replenish energy for heavy-duty new energy commercial vehicles with large amounts of electricity in order to address the above technical problems.

[0004] A range-extended vehicle-to-vehicle charging system includes a first vehicle controller, a rechargeable energy storage module, a main negative contactor, a fast charging contactor, a generator controller, a range extender, and a first DC charging socket and a second DC charging socket, wherein:

[0005] The first vehicle controller controls the main negative contactor, the contactor, the generator controller and the range extender;

[0006] The rechargeable energy storage module is connected to the fast charging contactor and the generator controller respectively through the main negative contactor; the main negative contactor is used to disconnect the rechargeable energy storage module from the charging vehicle; the generator controller is connected to the range extender through a high-voltage three-phase wiring harness, and is used to convert the three-phase AC power output by the range extender into DC power;

[0007] The first DC charging socket is connected to the fast charging contactor and the first vehicle controller respectively;

[0008] The vehicle-to-vehicle charging harness is used to connect the first DC charging socket and the second DC charging socket; the fast charging contactor is used to transmit the charging current output by the range extender from the discharging vehicle to the second DC charging socket via the vehicle-to-vehicle charging harness connected to the first DC charging socket.

[0009] An extended-range vehicle-to-vehicle charging method is applied to the above-mentioned extended-range vehicle-to-vehicle charging system, and the method comprises:

[0010] Connect the discharging vehicle and the charging vehicle via a vehicle-to-vehicle charging harness;

[0011] Starting a first vehicle controller of the discharging vehicle based on a second control signal port of a first DC charging socket of the discharging vehicle, and determining whether the discharging vehicle is in a vehicle-to-vehicle charging mode according to a resistance value of a first resistor connected to the second control signal;

[0012] After the discharging vehicle enters the vehicle-to-vehicle charging mode, controlling the first vehicle controller to control the auxiliary power contactor to close so as to start the second vehicle controller of the charging vehicle through the positive control signal port and the negative control signal port of the first DC charging socket, and determining whether the charging vehicle is in the vehicle-to-vehicle charging mode according to the resistance value of the second resistor connected to the second control signal port of the second DC charging socket;

[0013] After confirming that the charging vehicle enters the vehicle-to-vehicle charging mode, performing signal interaction based on the positive signal port and the negative signal port of the first DC charging socket and the second DC charging socket, and determining whether the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging conditions according to the interaction signal;

[0014] When the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging condition, the fast charging contactor and the pre-charging module are controlled to be closed in sequence, and after the pre-charging is completed, the pre-charging contactor of the pre-charging module is controlled to be disconnected;

[0015] The range extender is started to charge the charging vehicle.

[0016] A discharge vehicle, comprising the first vehicle controller in the above scheme, a rechargeable energy storage module, a main negative contactor, a fast charging contactor, a generator controller, a range extender and a first DC charging socket;

[0017] The rechargeable energy storage module is connected to the fast charging contactor and the generator controller respectively through the main negative contactor; the main negative contactor is used to disconnect the rechargeable energy storage module from the charging vehicle; the generator controller is connected to the range extender through a high-voltage three-phase wiring harness, and is used to convert the three-phase AC power output by the range extender into DC power;

[0018] The first DC charging socket is connected to the fast charging contactor and the first vehicle controller respectively;

[0019] Among them, in the car-to-car charging mode, the first DC charging socket is connected to the second DC charging socket of the charging vehicle through a car-to-car charging harness; the fast charging contactor is used to transmit the charging current output by the range extender to the charging vehicle through the car-to-car charging harness connected to the first DC charging socket.

[0020] A charging vehicle, comprising the second vehicle controller and a second DC charging socket of the above solution, wherein the second DC charging socket is connected to the first DC charging socket of the discharging vehicle through a vehicle-to-vehicle charging harness;

[0021] The second DC charging socket is used to start the second vehicle controller according to a determination signal output by the discharging vehicle through the first DC charging socket;

[0022] In the vehicle-to-vehicle charging mode, the charging current output by the range extender of the discharging vehicle is input into the charging vehicle through the second DC charging socket.

[0023] The above-mentioned extended-range vehicle-to-vehicle charging system and method, discharge vehicle, and charging vehicle, in vehicle-to-vehicle charging mode, use a vehicle-to-vehicle charging harness to connect the first DC charging socket and the second DC charging socket, and the rechargeable energy storage module in the system is connected to the fast charging contactor and the engine controller respectively through the main negative contactor to provide working power for different components, wherein the main negative contactor can disconnect the rechargeable energy storage module from the charging vehicle, and the engine controller is connected to the range extender through a high-voltage three-phase harness to convert the three-phase AC output of the range extender into DC power, and the DC power is transferred from the first DC charging socket to the second DC charging socket through the vehicle-to-vehicle charging harness through the fast charging contactor. Based on this, vehicle-to-vehicle DC charging is realized, which can increase the charging power and meet the needs of rapid energy replenishment for vehicles with large battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a range-extended vehicle-to-vehicle charging system in one embodiment;

[0025] Figure 2 The figure is a flow chart of an extended-range vehicle-to-vehicle charging method applied to an extended-range vehicle-to-vehicle charging system in one embodiment.

[0026] Figure numerals: discharging vehicle 100, vehicle-to-vehicle charging harness 200, charging vehicle 300, first vehicle controller 101, rechargeable energy storage module 102, pre-charging module 103, main negative contactor 104, fast charging contactor 105, generator controller 106, range extender 107, drive motor module 108, other high-voltage control module 109, auxiliary power contactor 110, first DC charging socket 111, first charging plug 201, second charging plug 202, second vehicle controller 301, second DC charging socket 302, main positive contactor 1031, pre-charging contactor 1032, first resistor R1, second resistor R3, third resistor R2, fourth resistor R4, pre-charging resistor R5. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] The implementation details of the technical solution of the embodiment of the present application are described in detail below.

[0029] like Figure 1 As shown, Figure 1 The schematic diagram of the structure of the extended-range vehicle-to-vehicle charging system is shown. The extended-range vehicle-to-vehicle charging system is a system that allows one extended-range electric vehicle to provide electrical energy to another electric vehicle. The extended-range vehicle-to-vehicle charging system can be divided into a discharge vehicle 100, a charging vehicle 300 and a vehicle-to-vehicle charging harness 200, wherein the discharge vehicle 100 is a vehicle that provides electrical energy, mainly including a first vehicle controller 101, a rechargeable energy storage module 102, a main negative contactor 104, a fast charging contactor 105, a generator controller 106, a range extender 107, an auxiliary power contactor 110 and a first DC charging socket 111 connected using a number of high and low voltage harnesses, wherein the fast charging contactor 105 can be divided into a fast charging positive contactor and a fast charging negative contactor. The charging vehicle 200 refers to an electric vehicle that needs to be charged, usually a vehicle with insufficient battery power, and mainly includes a second vehicle controller 301 and a second DC charging socket 302. The vehicle-to-vehicle charging harness 200 is a cable used to connect the discharging vehicle 100 and the charging vehicle 200 , and is connected to the first DC charging socket 111 of the discharging vehicle 100 and the second DC charging socket 302 of the charging vehicle 200 , respectively, and can transmit electric energy and control signals.

[0030] Combine the following Figure 1 The main components and working principles of the system are described in detail.

[0031] The first vehicle controller 101 is an electronic control unit responsible for managing the vehicle-to-vehicle charging process to ensure the safety and efficiency of vehicle-to-vehicle charging. The first vehicle controller 101 controls the main negative contactor 104, the fast charging contactor 105, the generator controller 106 and the range extender 107 through a bus or hard wire, and realizes the output of charging current by controlling the operation of the generator controller 106 and the range extender 107. The first vehicle controller 101 is used to control the closing or opening of the main negative contactor 104 and the fast charging contactor 105 to connect the working circuit of the vehicle-to-vehicle charging mode, so that the generated charging current can flow to the charging vehicle 200 through the working circuit.

[0032] The rechargeable energy storage module 102 uses a high-voltage wiring harness to pass through the main negative contactor 104 and then connect to the fast charging contactor 105 and the generator controller 106 respectively. The generator controller 106 is connected to the range extender 107 through a high-voltage three-phase wiring harness. The main negative contactor 104 can realize the connection between the rechargeable energy storage module 102 of the discharge vehicle 100 and the charging vehicle 200. When the main negative contactor 104 is in the disconnected state, the connection between the rechargeable energy storage module 102 of the discharge vehicle 100 and the charging vehicle 200 is disconnected. The range extender 107 is used to provide the charging power required by the charging vehicle 200, that is, the charging vehicle 200 is directly charged by the range extender 107. The range extender 107 usually includes an engine and a generator. When the engine is working, it will start and drive the generator. The generator runs under the drive of the engine to generate three-phase alternating current, wherein the maximum charging power can reach the rated power of the range extender 107, thereby improving the charging efficiency. Here, the discharging vehicle 100 charges the charging vehicle 200 by direct current, so the three-phase alternating current output by the range extender 107 needs to be rectified into stable direct current by the generator controller 106 .

[0033] In actual applications, the rechargeable energy storage modules between the discharging vehicle 100 and the charging vehicle 200 may have different voltages, capacities, charging protocols, etc., so the rechargeable energy storage modules of the discharging vehicle 100 and the charging vehicle 200 cannot be directly connected. Based on this, in the above connection relationship, the fast charging contactor 105 is arranged at the rear end of the main negative contactor 104, so that when the vehicle is driving normally, the rechargeable energy storage module 102 of the discharge vehicle 100 can be kept connected and powered, and when charging other vehicles, the main negative contactor 104 can disconnect the rechargeable energy storage module 102 of the discharge vehicle 100 from the rechargeable energy storage module of the charging vehicle 200, thereby avoiding abnormal situations caused by the mutual charging of the rechargeable energy storage modules of the discharge vehicle 100 and the charging vehicle 200. At the same time, after the main negative contactor 104 remains in the disconnected state, the rechargeable energy storage system is completely isolated from the range extender 107, and the charging current output by the range extender 107 only flows to the charging vehicle 200 through the fast charging contactor 105, thereby avoiding the rechargeable energy storage module 102 from participating in the current circulation.

[0034] During the vehicle-to-vehicle charging process, the first DC charging socket 111 is used as a discharge interface for charging other vehicles and is connected to the first vehicle controller 101. The first vehicle controller 101 can process the signal received by the first DC charging socket 111, and can also send different signals to the charging vehicle 200 through the first DC charging socket 111 to ensure that the discharging vehicle 100 and the charging vehicle 200 can smoothly perform vehicle-to-vehicle charging.

[0035] The first DC charging socket 111 is also connected to the fast charging contactor 105, so that the charging current output by the range extender 107 flows from the fast charging contactor 105 to the first DC charging socket 111, and then flows into the second DC charging socket 111 through the vehicle-to-vehicle charging harness 200 connected to the first DC charging socket 111, so as to charge the charging vehicle 200, thus forming a complete vehicle-to-vehicle charging current loop. Among them, the first DC charging socket 111 outputs a DC current, and the second DC charging socket 302 inputs a DC current, that is, a DC charging mode is adopted. Compared with the mode based on inverter AC power, the DC charging mode has a fast charging speed, can realize fast energy replenishment, and can complement the grid energy replenishment charging. When the grid load is large, the vehicle-to-vehicle charging mode is adopted, which can reduce the grid load to a limited extent, and can realize fast energy replenishment for heavy commercial vehicles with large power.

[0036] Based on this, after the charging vehicle 200 enters the vehicle-to-vehicle charging mode, the extended-range vehicle-to-vehicle charging system starts the range extender 107. The range extender 107 converts mechanical energy into electrical energy through the generator. The electrical energy is rectified into direct current through the generator controller 106. The direct current is transmitted to the first DC charging socket through the fast charging contactor 105, and is transmitted to the second DC charging socket 302 of the charging vehicle 200 through the vehicle-to-vehicle charging harness 200. Finally, the charging vehicle 200 imports the electrical energy received by the second DC charging socket 302 into its energy storage system to achieve charging. In the process of vehicle-to-vehicle charging, the vehicle range extender 107 can be used to directly charge other vehicles without the need to install an additional on-board charger, thereby reducing the cost of the entire vehicle and improving the charging rate. In addition, the movement of the discharge vehicle 100 can be used to solve the problem of remote rescue of heavy commercial vehicles.

[0037] In one embodiment, the vehicle-to-vehicle charging harness 200 includes a first charging plug 201, which is connected to the first DC charging socket 111. The first DC charging socket 111 and the first charging plug 201 are composed of different signal ports, including a first control signal port (CC1), a second control signal port (CC2) and a ground port (PE). The specific connection of each signal port is as follows: PE is directly connected to the ground port (GND) of the discharging vehicle 100 through a low-voltage harness, CC2 in the first DC charging socket 111 is connected to the first vehicle controller 101, CC2 of the first charging plug 201 is connected to PE through a first resistor R1, and CC1 in the first DC charging socket 111 is suspended and connected to GND through a third resistor R2.

[0038] Among them, CC2 is a dedicated control signal line, which is mainly used to transmit the port connection status information of the first DC charging socket 111. When the vehicle-to-vehicle charging harness 200 is connected to the first DC charging socket 111 and the second DC charging socket 302, it indicates that the discharge vehicle 100 needs to be charged externally, so it is necessary to start the first vehicle controller 101 to manage the charging process of the discharge vehicle 100. Based on this, the discharge vehicle 100 detects through hardware that the CC2 port is connected to the first resistor R1, that is, it detects that the CC2 port is connected, thereby generating a start signal at the CC2 port, and transmitting the start signal to the first vehicle controller 101, so that the first vehicle controller 101 is started.

[0039] In actual application, the first DC charging socket 111 of the discharge vehicle 100 can be connected to a DC fast charging plug to enter the DC fast charging mode, that is, the discharge vehicle 100 is charged by the DC fast charging plug. In this embodiment, the first DC charging socket 111 can also be connected to the vehicle-to-vehicle charging harness 200 to enter the vehicle-to-vehicle charging mode, that is, the charging vehicle 200 is charged by the discharge vehicle 100. Since the discharge vehicle 100 supports two different charging modes, the first vehicle controller 101 is required to determine which charging mode processing flow the discharge vehicle 100 needs to perform at this time.

[0040] It can be understood that if the discharging vehicle 100 is in a DC fast charging scenario, the first DC charging socket 111 is connected to the DC fast charging plug. At this time, the resistor connected to CC2 of the first DC charging socket 111 is the resistance of the DC fast charging plug. In the scenario of car-to-car charging, the discharging vehicle 100 uses a car-to-car charging harness 200 to connect the first DC charging socket 111 of the discharging vehicle 100 with the second DC charging socket 302 of the charging vehicle 200. At this time, the resistor connected to CC2 of the first DC charging socket 111 is the resistance of the first charging plug 201. Therefore, the resistance of the DC fast charging plug and the resistance of the first charging plug 201 are set to different resistance values. Then, the first resistor R1 serves as a connecting device between CC2 and PE of the first charging plug 201 of the car-to-car charging harness 200, and its resistance value represents the car-to-car charging mode, so that the resistance value of the resistor connected to CC2 is used as the basis for identifying the charging mode. Among them, the resistance value in the DC fast charging plug is 1000±30Ω, and the resistance value of the first resistor R1 in the first charging plug 201 is not 1000±30Ω.

[0041] Based on this, the first vehicle controller 101 can determine whether the discharging vehicle 100 enters the vehicle-to-vehicle charging mode by detecting the resistance value of the first resistor R1 connected to CC2.

[0042] In the above embodiment, the vehicle can use the vehicle DC charging socket to realize the vehicle-to-vehicle charging function without affecting the normal DC charging function, without installing additional components, thereby reducing the cost of the entire vehicle.

[0043] In one embodiment, the extended-range vehicle-to-vehicle charging system further includes a second vehicle controller 301 , which is responsible for charging management on the charging vehicle side.

[0044] The vehicle-to-vehicle charging harness 200 further includes a second charging plug 202 and a harness for connecting the first charging plug 201 and the second charging plug 202 . The charging plug is used to connect to the second DC charging socket 302 .

[0045] Similar to the first DC charging socket 111 and the first charging plug 201, the second DC charging socket 302 and the second charging plug 202 include a first control signal port (CC1), a second control signal port (CC2), and a ground port (PE). The specific connection of each signal port is as follows: the PE port is directly connected to the ground port (GND) of the charging vehicle 200 through a low-voltage wiring harness, the CC2 port in the second DC charging socket 302 is connected to the second vehicle controller 301, the CC2 port of the second charging plug 202 is connected to the PE port through the second resistor R3, and the CC1 port in the second DC charging socket 302 is suspended and connected to GND through the fourth resistor R4.

[0046] Similar to the discharging vehicle 100, the charging vehicle 200 also supports the two modes of DC fast charging and car-to-car charging, so it is necessary to confirm whether the second DC charging socket 302 is connected to a DC fast charging plug or a car-to-car charging harness 200. There is a difference in the resistance value of the resistor configured for the CC2 port of the DC fast charging plug and the car-to-car charging harness 200, wherein the resistance value of the resistor connected to the CC2 port in the DC fast charging plug is 1000±30Ω, while the resistance value of the resistor connected to the CC2 port in the second charging plug 202 in the car-to-car charging harness 200 is not 1000±30Ω.

[0047] Based on this, the second vehicle controller 301 is required to determine whether the charging vehicle 200 enters the vehicle-to-vehicle charging mode according to the resistance value of the second resistor R3R3 connected to the CC2 port.

[0048] In one embodiment, the extended-range vehicle-to-vehicle charging system further includes an auxiliary power contactor 110, one end of which is connected to a low-voltage power supply (24V), and the low-voltage power supply supplies power to low-voltage components in the system. The first vehicle controller 101 can control the on-off of the auxiliary power contactor 110, and the low-voltage power supply can be disconnected or connected by the on-off of the auxiliary power contactor 110.

[0049] The first DC charging socket 111 and the second DC charging socket 302 include different signal ports, including a positive control signal port (A+) and a negative signal control port (A-). The A+ port of the first DC charging socket 111 is connected to the auxiliary power contactor 110, and the A- port of the first DC charging socket 111 is connected to the first vehicle controller 101.

[0050] When the auxiliary power contactor 110 is closed, the auxiliary power contactor 110 is connected to the low-voltage power supply to transmit a positive voltage, and the A- port is used as a reference voltage to form a voltage difference with the A+ port. In practical applications, the A+ port and the A- port usually transmit signals through voltage changes. When the auxiliary power contactor 110 is closed, the A+ port is connected to the low-voltage power supply, and then a change occurs between the A+ port and the A- port, forming a voltage difference. The voltage difference is equivalent to a start signal. This start signal is transmitted from the A+ port and the A- port of the first DC charging socket 111 to the A+ port and the A- port of the second DC charging socket 302. The second DC charging socket 302 receives the start signal and starts the second vehicle controller 301 of the charging vehicle 200 through this start signal.

[0051] In one embodiment, the first DC charging socket 111 further includes a DC positive port (DC+) and a DC negative port (DC-), wherein the fast charging positive contactor and the fast charging negative contactor are respectively connected to the DC+ port and the DC- port of the first DC charging socket 111. After confirming that the discharging vehicle 100 and the charging vehicle 200 have entered the vehicle-to-vehicle charging mode, the first vehicle controller 101 controls the fast charging positive contactor and the fast charging negative contactor to be in a closed state, thereby establishing a DC high-voltage path for vehicle-to-vehicle charging, allowing the charging current to flow formally, so that the charging current can enter the vehicle-to-vehicle charging harness 200 from the first DC charging socket 111 through the fast charging contactor 105, and be transmitted to the charging vehicle 300.

[0052] It should be noted that the second DC charging socket 302, the first charging plug 201 and the second charging plug 202 respectively include a DC+ port and a DC- port. The charging current flows out from the DC+ port and the DC- port of the first DC charging socket 111 through the vehicle-to-vehicle charging harness 200, and then flows into the DC+ port and the DC- port of the second DC charging socket 302, so that the charging vehicle 200 can store the electric energy provided by the discharging vehicle 100 in the power battery pack.

[0053] In one embodiment, the first DC charging socket 111 and the second DC charging socket 302 further include a positive signal port (S+) and a negative signal port (S-), wherein the S+ port and the S- port of the first DC charging socket 111 are directly connected to the first vehicle controller 101 through a low-voltage wiring harness, and the S+ port and the S- port of the second DC charging socket 302 are directly connected to the second vehicle controller 301 through a low-voltage wiring harness.

[0054] The S+ port and the S- port are low-voltage signal lines used for information exchange between two vehicles. They are mainly responsible for transmitting status information related to charging conditions. After both the discharging vehicle 100 and the charging vehicle 200 enter the vehicle-to-vehicle charging mode, the discharging vehicle 100 and the charging vehicle 200 use the S+ port and the S- port to exchange signals. The exchanged signals may include the following:

[0055] (1) The status of the vehicle's electrical interface, such as whether the connection is reliable, and whether there is a short circuit or open circuit.

[0056] (2) Voltage and current capability: The discharging vehicle 100 can learn the maximum charging voltage and current allowed by the charging vehicle 200 through the exchanged signals, so that the discharging vehicle 100 can determine whether the charging requirements of the charging vehicle 200 are met.

[0057] (3) Fault diagnosis information, such as ground fault, contactor abnormality, etc.

[0058] After completing the signal interaction, the first vehicle controller 101 can determine whether the charging vehicle 200 meets the charging conditions based on the signals received by the S+ port and the S- port of the first DC charging socket 111, including confirming whether the connection of the charging vehicle 200 is reliable, determining whether the charging demand of the charging vehicle 200 is within the capacity of the range extender 107 of the discharging vehicle 100, and confirming that there are no abnormalities in the signal interaction process (such as communication timeout, error code, etc.). Similarly, the second vehicle controller 301 can determine whether the discharging vehicle 100 meets the charging conditions based on the signals received by the S+ port and the S- port of the second DC charging socket 302, including checking whether the discharging vehicle 100 has charging capabilities, confirming whether the discharging vehicle 100 can provide stable power, and confirming that there are no abnormalities in the signal interaction process.

[0059] When confirming that both the discharge vehicle 100 and the charge vehicle 200 meet the vehicle-to-vehicle charging conditions, the first vehicle controller 101 controls the operation of various components in the discharge vehicle 100 so that the discharge vehicle 100 can provide charging current for the charge vehicle 200 through the range extender 107 .

[0060] In one embodiment, the first vehicle controller 101 can also control the generator controller 106 to adjust the power generation of the range extender 107 according to the charging capacity of the charging vehicle 200. Among them, the charging capacity of the charging vehicle 200 is mainly determined by the charging voltage range, the maximum charging current, and the target power demand. The charging vehicle 200 will feed back this information to the discharging vehicle 100 through the S+ port and the S- port. The power generation of the range extender 107 is mainly determined by the requirements fed back by the charging vehicle 200 (the voltage, current and power range allowed by the charging vehicle 200), the capacity of the range extender 107 and the system protection mechanism.

[0061] The first vehicle controller 101 receives the charging parameters fed back by the charging vehicle 200 through the S+ port and the S- port, including the target voltage, current and power. Then the first vehicle controller 101 calculates the required power generation according to the demand and the current state of the range extender 107, and generates corresponding control instructions. The generator controller 106 adjusts the power generation of the range extender 107 according to the control instructions to match the demand of the charging vehicle 200. In general, the charging demand of the charging vehicle 200 will change with the change of the battery power state. In the constant current stage, the range extender 107 is required to provide a higher current; in the constant voltage stage, the range extender 107 is required to gradually reduce the power generation.

[0062] During the vehicle-to-vehicle charging process, the discharging vehicle 100 and the charging vehicle 200 will continuously interact through the S+ port and the S- port, and monitor in real time whether the voltage and current match. If the demand changes (such as the charging vehicle 200 enters the constant voltage stage), the first vehicle controller 101 will dynamically adjust the power generation power of the range extender 107 so that the power generation power of the range extender 107 matches the charging demand of the charging vehicle 200, thereby preventing battery damage caused by excessive voltage or current.

[0063] In one embodiment, the extended-range vehicle-to-vehicle charging system further includes a pre-charging module 103, and the pre-charging module 103 is connected to the rechargeable energy storage module 102. It should be noted that the fast-charging positive contactor is at the front end of the pre-charging module 103, so that the extended-range vehicle-to-vehicle charging system can use the pre-charging module 103 to pre-charge the generator controller 106 and other modules of the discharging vehicle 100 when the discharging vehicle 100 charges the charging vehicle 200.

[0064] The pre-charging module 103 includes a main positive contactor 1031 , a pre-charging contactor 1032 and a pre-charging resistor R5 . The pre-charging contactor 1032 and the pre-charging resistor R5 form a pre-charging circuit to realize the pre-charging function. The main positive contactor 1031 is used to form a closed vehicle-to-vehicle charging circuit.

[0065] The main function of pre-charging is to gradually increase the voltage of the system high-voltage circuit through the pre-charging resistor R5, avoid the impact caused by excessive voltage difference, help stabilize the system voltage, and avoid damage or high-voltage failure. Based on this, during pre-charging, the first vehicle controller 101 will control the pre-charging contactor 1032 to close, and control the main positive contactor 1031 to disconnect, so as to pre-charge the generator controller 106 through the pre-charging circuit. After the voltage reaches a certain stable value, that is, when the pre-charging is completed, the first vehicle controller 101 will control the pre-charging contactor 1032 to disconnect, end the pre-charging of the generator controller 106, and control the main positive contactor 1031 to close, so that the electric energy output by the range extender 107 can pass through the closed main positive contactor 1031, from the fast charging contactor 105 and the first DC charging socket 111 through the vehicle-to-vehicle charging harness 200 to the charging vehicle 200.

[0066] It should be noted that the discharge vehicle 100 in the extended-range vehicle-to-vehicle charging system may also include a drive motor module 108 and other high-voltage control modules 109, wherein the rechargeable energy storage module 102 uses a high-voltage wiring harness to connect the drive motor module 108 and other high-voltage control modules 109 through the pre-charging module 103 and the main negative contactor 104, and the first vehicle controller 101 controls the drive motor module 108 and other high-voltage control modules 109 through a bus or hard wire. During pre-charging, the pre-charging module 103 can pre-charge the drive motor module 108 and other high-voltage control modules 109.

[0067] In actual applications, the drive motor module 108 is the power core of the vehicle, responsible for converting electrical energy into mechanical energy, driving the vehicle and providing acceleration, deceleration and regenerative braking functions; other high-voltage control modules 109 are responsible for managing and controlling various other aspects of high-voltage electrical, including battery management, charging control and power distribution, to ensure the safe and efficient operation of the system.

[0068] In the above embodiment, the extended-range vehicle-to-vehicle charging system includes a discharge vehicle, a charging vehicle and a vehicle-to-vehicle charging harness. The discharge vehicle includes a first vehicle controller, a rechargeable energy storage module, a main negative contactor, a fast charging contactor, a generator controller, a range extender, an auxiliary power contactor and a first DC charging socket. The charging vehicle includes a second vehicle controller and a second DC charging socket. The vehicle-to-vehicle charging harness is used to connect the first DC charging socket and the second DC charging socket. Among them, the main negative contactor is used to disconnect the rechargeable energy storage module from the discharge vehicle to ensure the safety of vehicle-to-vehicle charging; the auxiliary power contactor is used to connect the low-voltage power supply to the first DC charging socket to wake up the charging vehicle for vehicle-to-vehicle charging; the three-phase AC power output by the range extender is rectified into DC power by the generator controller, and then flows from the fast charging contactor and the first DC charging socket through the vehicle-to-vehicle charging harness to the second DC charging socket of the charging vehicle, thereby realizing direct DC charging of the charging vehicle using the range extender, which can effectively improve the charging efficiency and achieve rapid energy replenishment.

[0069] In one embodiment, Figure 2 As shown, Figure 2 Provides an application Figure 1 The extended-range vehicle-to-vehicle charging method of the extended-range vehicle-to-vehicle charging system shown may include the following steps:

[0070] Step S101, connecting a discharging vehicle and a charging vehicle via a vehicle-to-vehicle charging harness.

[0071] Here, the discharging vehicle 100 is a vehicle that provides electric energy based on the range extender, and the charging vehicle 200 refers to a vehicle that needs to be charged. During the vehicle-to-vehicle charging process, the discharging vehicle 100 and the charging vehicle 200 need to be connected through the vehicle-to-vehicle charging harness 200 to form a channel for electric energy transmission, so that the discharging vehicle 100 can transmit the electric energy generated by the range extender 107 to the charging vehicle 200, and the discharging vehicle 100 and the charging vehicle 200 can also exchange status information through the vehicle-to-vehicle charging harness 200 to perform intelligent charging management.

[0072] Step S102, starting a first vehicle controller of the discharging vehicle based on a second control signal port of a first DC charging socket of the discharging vehicle, and determining whether the discharging vehicle is in a vehicle-to-vehicle charging mode according to a resistance value of a first resistor connected to a second control signal.

[0073] The vehicle-to-vehicle charging harness 200 includes a first charging plug 201 . When the vehicle-to-vehicle charging harness 200 is connected to the discharge vehicle 100 , the first charging plug 201 is connected to the first DC charging socket 111 .

[0074] In practical applications, the first DC charging socket 111 and the first charging plug 201 include different signal ports, including a second control signal port (CC2). In the first charging plug 201, the CC2 port is connected to the ground signal port PE through the first resistor R1. Based on this, when the first charging plug 201 is connected to the first DC charging socket 111, the CC2 port is connected to the first resistor R1, so that the CC2 port is phased, and the CC2 port generates a start signal, which is used to wake up the first vehicle controller 101 of the discharging vehicle 100.

[0075] It can be understood that the discharge vehicle 100 supports the DC fast charging mode and the car-to-car charging mode, that is, the first DC charging socket 111 can be connected to the DC fast charging plug to charge the discharge vehicle 100 using the power grid. In addition, the first DC charging socket 111 can also be connected to the car-to-car charging harness 200 to charge the charging vehicle 200. Based on this, the discharge vehicle 100 needs to determine the current charging mode before the corresponding charging process can be carried out to ensure charging safety. Among them, the resistance value of the resistor configured for the CC2 port in the DC fast charging plug is not the same as the resistance value of the resistor configured for the CC2 port in the first charging plug 201, which causes the resistance value of the resistor connected to the CC2 port in the first DC charging socket 111 to change. Usually, the resistance value of the resistor connected to the CC2 port in the DC fast charging plug is 1000±30Ω, while the resistance value of the resistor connected to the CC2 port in the first charging plug 201 is not 1000±30Ω. Therefore, the first vehicle controller 101 can determine whether the discharging vehicle 100 enters the vehicle-to-vehicle charging mode according to the resistance value of the first resistor R1 connected to the CC2 port.

[0076] Step S103, after the discharging vehicle enters the vehicle-to-vehicle charging mode, the first vehicle controller controls the auxiliary power contactor to close to start the second vehicle controller of the charging vehicle through the positive control signal port and the negative control signal port of the first DC charging socket, and determines whether the charging vehicle is in the vehicle-to-vehicle charging mode according to the resistance value of the second resistor connected to the second control signal port of the second DC charging socket.

[0077] During the car-to-car charging process, both the discharging vehicle 100 and the charging vehicle 200 need to enter the car-to-car charging mode so that the discharging vehicle 100 can provide power to the charging vehicle 200. In actual applications, the charging vehicle 200 is in a standby state when it is not awakened. The unaware charging vehicle 200 may not be able to correctly respond to the car-to-car charging request or perform signal interaction. Therefore, after the discharging vehicle 100 enters the car-to-car charging mode, the discharging vehicle 100 needs to wake up the charging vehicle 200 so that the charging vehicle 200 enters the car-to-car charging process. Specifically, the first vehicle controller 101 controls the auxiliary power contactor 110 to close, so that the low-voltage power supply (24V) will be connected to the positive control signal port (A+) in the first DC charging socket 111, and the negative control signal port (A-) in the first DC charging socket 111 is connected to the first vehicle controller 101, so that there is a voltage difference between the A+ port and the A- port, and a start signal is generated. This start signal will be transmitted to the second vehicle controller 301 through the A+ port and the A- port in the second DC charging socket 302 along with the vehicle-to-vehicle charging harness 200, thereby waking up the second vehicle controller 301.

[0078] The charging vehicle 200 also supports the DC fast charging mode and the car-to-car charging mode, that is, the second DC charging socket 302 can be connected to the DC fast charging plug to charge the discharging vehicle 100 using the power grid, and the second DC charging socket 302 can also be connected to the car-to-car charging harness 200 to charge the charging vehicle 200. Therefore, the charging vehicle 200 also needs to determine the current charging mode before carrying out the corresponding charging process to ensure charging safety.

[0079] In actual application, the second DC charging socket 302 and the second charging plug 202 include different signal ports, including a second control signal port CC2. In the second charging plug 202, the CC2 port is connected to the ground signal port PE through a second resistor R2. After the second DC charging socket 302 is connected to the second charging plug 202, the CC2 port in the second DC charging socket 302 is connected to the second resistor R2. Based on this, the started second vehicle controller 301 determines whether the charging vehicle 200 enters the vehicle-to-vehicle charging mode according to the resistance value of the second resistor R3 connected to the CC2 port of the second DC charging socket 302, wherein the resistance value of the resistor connected to the CC2 port in the DC fast charging plug is usually 1000±30Ω, while the resistance value of the resistor connected to the CC2 port in the second charging plug 202 is not 1000±30Ω.

[0080] Step S104, after confirming that the charging vehicle enters the vehicle-to-vehicle charging mode, signal interaction is performed based on the positive signal port and the negative signal port of the first DC charging socket and the second DC charging socket, and it is determined whether the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging conditions according to the interaction signal.

[0081] Here, after confirming that both the discharging vehicle 100 and the charging vehicle 200 have entered the vehicle-to-vehicle charging mode, it is necessary to determine whether the discharging vehicle 100 and the charging vehicle 200 meet the vehicle-to-vehicle charging conditions. The first DC charging socket 111 and the second DC charging socket 302 both include a positive signal port (S+) and a negative signal port (S-), and the discharging vehicle 100 and the charging vehicle 200 can exchange signals through the S+ port and the S- port, wherein the exchanged signals may include the following:

[0082] (1) The status of the vehicle's electrical interface, such as whether the connection is reliable, and whether there is a short circuit or open circuit.

[0083] (2) Voltage and current capability: The discharging vehicle 100 can learn the maximum charging voltage and current allowed by the charging vehicle 200 through the exchanged signals, so that the discharging vehicle 100 can determine whether the charging requirements of the charging vehicle 200 are met.

[0084] (3) Fault diagnosis information, such as ground fault, contactor abnormality, etc.

[0085] After completing the signal interaction, the first vehicle controller 101 determines whether the charging vehicle 200 has the vehicle-to-vehicle charging conditions according to the signals after the interaction, and the second vehicle controller 301 determines whether the discharging vehicle 100 has the vehicle-to-vehicle charging conditions according to the signals after the interaction. In practical applications, the vehicle-to-vehicle charging conditions are used to ensure that the discharging vehicle 100 and the charging vehicle 200 can ensure the smooth execution of vehicle-to-vehicle charging, wherein the vehicle-to-vehicle charging conditions generally include confirming whether the connection of the charging vehicle 200 is reliable, judging whether the charging demand of the charging vehicle 200 is within the capacity range of the range extender 107 of the discharging vehicle 100, and confirming that there are no abnormalities in the signal interaction process (such as communication timeout, error code, etc.).

[0086] Step S105, when the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging conditions, control the fast charging contactor and the pre-charging module to close, and control the main positive contactor to open, and after the pre-charging is completed, control the pre-charging contactor to open and control the main positive contactor to close.

[0087] When it is confirmed that the discharging vehicle 100 and the charging vehicle 200 meet the vehicle-to-vehicle charging conditions, it indicates that the discharging vehicle 100 and the charging vehicle 200 can meet the execution conditions of vehicle-to-vehicle charging, so that the first vehicle controller 101 will control various components in the discharging vehicle 100 so that the discharging vehicle 100 can smoothly output the charging current.

[0088] It is understandable that the discharge vehicle 100 needs to form a complete charging circuit in order to output the charging current. Figure 1 As shown, in order to ensure that the charging current output from the range extender 107 can flow smoothly into the charging vehicle 200, the first vehicle controller 101 needs to control the main positive contactor 1031 and the fast charging contactor 105 to be closed.

[0089] In order to avoid the impact caused by the excessive voltage difference, the generator controller 106 needs to be pre-charged before controlling the main positive contactor 1031 to close. The first vehicle controller 101 controls the pre-charge contactor 1032 in the pre-charge module 103 to close and the main positive contactor 1031 to open, and constructs the pre-charge circuit in the discharge vehicle 100 through the closed pre-charge contactor 1032 and the pre-charge resistor R5. During the pre-charge process, the voltage of the system high-voltage circuit is gradually increased through the pre-charge resistor R5, thereby realizing the pre-charge of the generator controller 106. After the pre-charge is completed, the first vehicle controller 101 controls the pre-charge contactor 1032 in the pre-charge module 103 to open, that is, to end the pre-charge, and controls the main positive contactor 1031 in the pre-charge module 103 to close, thereby forming a complete vehicle-to-vehicle charging circuit to provide normal charging current to the charging vehicle 200.

[0090] It should be noted that in the extended-range vehicle-to-vehicle charging system, the rechargeable energy storage module 102 is connected to the main negative contactor 104. During the entire vehicle-to-vehicle charging process, the first vehicle controller 101 controls the main negative contactor 104 to remain in an off state. When the main negative contactor 104 is in an off state, the connection between the rechargeable energy storage module 102 of the discharge vehicle 100 and the charging vehicle 200 can be disconnected, thereby avoiding abnormal situations caused by the mutual charging of the rechargeable energy storage modules of the two vehicles. Among them, the main negative contactor 104 does not affect the use of the rechargeable energy storage module 102 of the discharge vehicle 100 during normal driving of the vehicle.

[0091] Step S106, starting the range extender to charge the charging vehicle.

[0092] Here, after the first vehicle controller 101 builds a complete closed vehicle-to-vehicle charging loop, the discharge vehicle 100 and the charging vehicle 200 complete the high-voltage process, so that the first vehicle controller 101 controls the range extender 107 to start and charge the charging vehicle 200. The range extender 107 usually includes an engine and a generator. After the range extender 107 is started, the engine will start and drive the generator. The generator runs under the drive of the engine to generate three-phase AC power. Since the discharge vehicle 100 charges the charging vehicle 200 by DC charging, the three-phase AC power output by the range extender 107 also needs to be rectified into DC power by the generator controller 106. In the process of vehicle-to-vehicle charging, the maximum charging power can reach the rated power of the range extender 107, thereby effectively improving the charging efficiency.

[0093] The first DC charging socket 111 and the second DC charging socket 302 also include a DC positive port DC+ and a DC negative port DC-, wherein the fast charging positive contactor in the fast charging contactor 105 is connected to the DC+ port, and the fast charging negative contactor is connected to the DC- port, so that the charging current output by the range extender 107 passes through the fast charging contactor 105, flows out from the DC+ port and DC- port of the first DC charging socket 111, and flows into the charging vehicle 200 from the DC+ port and DC- port of the second DC charging socket 302.

[0094] During the vehicle-to-vehicle charging process, the first vehicle controller 101 can adjust the power generation of the range extender 107 through the generator controller 106 according to the charging capacity allowed by the charging vehicle 200. Specifically, during the vehicle-to-vehicle charging process, the first vehicle controller 101 receives the charging parameters fed back by the charging vehicle 200 through the S+ port and the S- port. The first vehicle controller 101 calculates the required power generation according to the fed back charging parameters and the current state of the range extender 107, and sends the corresponding control instructions to the generator controller 106, so that the generator adjusts the power generation of the range extender 107 according to the control instructions, so that the power generation of the range extender 107 can match the charging capacity allowed by the charging vehicle 200.

[0095] In the above embodiment, the discharging vehicle and the charging vehicle are connected through a vehicle-to-vehicle charging harness, and based on the first vehicle controller of the discharging vehicle and the second vehicle controller of the charging vehicle, it is determined whether the discharging vehicle and the charging vehicle enter the vehicle-to-vehicle charging mode, and whether the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging conditions. In the case of entering the vehicle-to-vehicle charging mode and meeting the vehicle-to-vehicle charging conditions, the contactor in the discharging vehicle is controlled based on the first vehicle controller, so that a complete closed vehicle-to-vehicle charging circuit is formed in the discharging vehicle, thereby ensuring that the charging current output by the range extender can smoothly flow into the charging vehicle, and realizing the direct charging of other vehicles by the range extender, and the charging method adopts a DC charging mode, which can increase the charging rate and achieve rapid energy replenishment.

[0096] In one embodiment, a discharging vehicle is provided, including a first vehicle controller 101, a rechargeable energy storage module 102, a main negative contactor 104, a fast charging contactor 105, a range extender 107, an auxiliary power contactor 110 and a first DC charging socket 111, wherein the connection relationship between the various components in the discharging vehicle 100 and the operation of each component can refer to the above-mentioned illustration and description of the embodiment based on the extended-range vehicle-to-vehicle charging system, which will not be repeated here.

[0097] In one embodiment, a charging vehicle is provided, including a second vehicle controller 301 and a second DC charging socket 302, wherein the connection relationship between the various components in the charging vehicle 200 and the operation of each component can refer to the above-mentioned instructions and descriptions based on the embodiment of the extended-range vehicle-to-vehicle charging system, and will not be repeated here.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0100] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An extended-range vehicle-to-vehicle charging system, characterized in that: The invention comprises a first vehicle controller (101), a rechargeable energy storage module (102), a main negative contactor (104), a fast charging contactor (105), a generator controller (106), a range extender (107), a first DC charging socket (111) and a second DC charging socket (302), wherein: The first vehicle controller (101) controls the main negative contactor (104), the contactor (105), the generator controller (106) and the range extender (107); The rechargeable energy storage module (102) is connected to the fast charging contactor (105) and the generator controller (106) respectively through the main negative contactor (104); the main negative contactor (104) is used to disconnect the rechargeable energy storage module (102) from the charging vehicle (300); the generator controller (106) is connected to the range extender (107) through a high-voltage three-phase wiring harness, and is used to convert the three-phase alternating current output by the range extender (107) into direct current; The first DC charging socket (111) is connected to the fast charging contactor (105) and the first vehicle controller (101) respectively; The vehicle-to-vehicle charging harness (200) is used to connect the first DC charging socket (111) and the second DC charging socket (302); the fast charging contactor (105) is used to transmit the charging current output by the range extender (107) to the second DC charging socket (302) via the vehicle-to-vehicle charging harness (200) connected to the first DC charging socket (111).

2. The extended-range vehicle-to-vehicle charging system according to claim 1, characterized in that: The vehicle-to-vehicle charging harness (200) comprises a first charging plug (201) connected to the first DC charging socket (111); the first charging plug (201) and the first DC charging socket (111) comprise a first control signal port, a second control signal port, and a ground port; The first control signal port of the first DC charging socket (111) is suspended, the second control signal port of the first DC charging socket (111) is connected to the first vehicle controller (101); the second control signal port of the first charging plug (201) is connected to the ground port via a first resistor (R1); The second control signal port of the first DC charging socket (111) is used to start the first vehicle controller (101), and the first vehicle controller (101) is used to determine whether the discharging vehicle (100) enters a vehicle-to-vehicle charging mode according to the resistance value of the first resistor (R1).

3. The extended-range vehicle-to-vehicle charging system according to claim 2, characterized in that: The extended-range vehicle-to-vehicle charging system further includes a second vehicle controller (301); The vehicle-to-vehicle charging harness (200) comprises a second charging plug (202) connected to the second DC charging socket (302), and the first charging plug (201) and the second charging plug (202) are connected via a harness; The second DC charging socket (302) and the second charging plug (202) comprise a first control signal port, a second control signal port, and a ground port; the first control signal port of the second DC charging socket (302) is suspended, and the second control signal port of the second DC charging socket (302) is connected to the second vehicle controller (301); the second control signal port of the second charging plug (202) is connected to the ground port via a second resistor (R3); The second vehicle controller is used to determine whether the charging vehicle (300) enters a vehicle-to-vehicle charging mode according to the resistance value of the second resistor (R3).

4. The extended-range vehicle-to-vehicle charging system according to claim 3, characterized in that: The extended-range vehicle-to-vehicle charging system further comprises an auxiliary power contactor (110), wherein the auxiliary power contactor (110) is used to connect a low-voltage power supply to the first DC charging socket (111); The first DC charging socket (111) and the second DC charging socket (302) comprise a positive control signal port and a negative control signal port; the positive control signal port of the first DC charging socket (111) is connected to the auxiliary power contactor (110), and the negative control signal port is connected to the first vehicle controller (101); The first vehicle controller (101) is used to control the auxiliary power contactor (110) to close; the closed auxiliary power contactor (110) is used to start the second vehicle controller (301) through the positive control signal port and the negative control signal port of the first DC charging socket (111).

5. The extended-range vehicle-to-vehicle charging system according to claim 3, characterized in that: The first DC charging socket (111) comprises a DC positive port and a DC negative port, the DC positive port is connected to the fast charging positive contactor, and the DC negative port is connected to the fast charging negative contactor; after the discharging vehicle (100) and the charging vehicle (300) enter a vehicle-to-vehicle charging mode, the first vehicle controller (101) is used to control the fast charging contactor (105) to close.

6. The extended-range vehicle-to-vehicle charging system according to claim 5, characterized in that: The first DC charging socket (111) and the second DC charging socket (302) further include a positive signal port and a negative signal port for signal interaction; The first vehicle controller (101) is used to determine whether the charging vehicle (300) meets the vehicle-to-vehicle charging conditions according to the signals received by the positive signal port and the negative signal port of the first DC charging socket (111); The second vehicle controller (301) is used to determine whether the discharging vehicle (100) meets the vehicle-to-vehicle charging conditions according to the signals received by the positive signal port and the negative signal port of the second DC charging socket (302).

7. The extended-range vehicle-to-vehicle charging system according to claim 1, characterized in that: The first vehicle controller (101) is further used to control the generator controller (106) so that the power generation power of the range extender (107) matches the charging capacity of the charging vehicle (300).

8. The extended-range vehicle-to-vehicle charging system according to claim 7, characterized in that: The extended-range vehicle-to-vehicle system further comprises a pre-charging module (103), the pre-charging module (103) being composed of a main positive contactor (1031), a pre-charging contactor (1032) and a pre-charging resistor (R5); the pre-charging module (103) being used to pre-charge the generator controller (106); the first vehicle controller (101) being used to control the closing of the pre-charging contactor (1032) and the disconnection of the main positive contactor (1031) during pre-charging, and controlling the disconnection of the pre-charging contactor (1032) and the closing of the main positive contactor (1031) after the pre-charging is completed.

9. A range-extended vehicle-to-vehicle charging method, characterized in that: The extended-range vehicle-to-vehicle charging system according to any one of claims 1 to 7, the method comprising: Connect the discharging vehicle and the charging vehicle via a vehicle-to-vehicle charging harness; Starting a first vehicle controller of the discharging vehicle based on a second control signal port of a first DC charging socket of the discharging vehicle, and determining whether the discharging vehicle is in a vehicle-to-vehicle charging mode according to a resistance value of a first resistor connected to the second control signal; After the discharging vehicle enters the vehicle-to-vehicle charging mode, controlling the first vehicle controller to control the auxiliary power contactor to close so as to start the second vehicle controller of the charging vehicle through the positive control signal port and the negative control signal port of the first DC charging socket, and determining whether the charging vehicle is in the vehicle-to-vehicle charging mode according to the resistance value of the second resistor connected to the second control signal port of the second DC charging socket; After confirming that the charging vehicle enters the vehicle-to-vehicle charging mode, performing signal interaction based on the positive signal port and the negative signal port of the first DC charging socket and the second DC charging socket, and determining whether the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging conditions according to the interaction signal; When the discharging vehicle and the charging vehicle meet the vehicle-to-vehicle charging condition, the fast charging contactor and the pre-charging module are controlled to be closed in sequence, and after the pre-charging is completed, the pre-charging contactor of the pre-charging module is controlled to be disconnected; The range extender is started to charge the charging vehicle.

10. A discharge vehicle, comprising the first vehicle controller (101) as claimed in claim 1, a rechargeable energy storage module (102), a main negative contactor (104), a fast charging contactor (105), a generator controller (106), a range extender (107) and a first DC charging socket (111), characterized in that: The rechargeable energy storage module (102) is connected to the fast charging contactor (105) and the generator controller (106) respectively through the main negative contactor (104); the main negative contactor (104) is used to disconnect the rechargeable energy storage module (102) from the charging vehicle (300); the generator controller (106) is connected to the range extender (107) through a high-voltage three-phase wiring harness, and is used to convert the three-phase alternating current output by the range extender (107) into direct current; The first DC charging socket (111) is connected to the fast charging contactor (105) and the first vehicle controller (101) respectively; Wherein, in the vehicle-to-vehicle charging mode, the first DC charging socket (111) is connected to the second DC charging socket (302) of the charging vehicle (300) through the vehicle-to-vehicle charging harness (200); the fast charging contactor (105) is used to transmit the charging current output by the range extender (107) to the charging vehicle (300) via the vehicle-to-vehicle charging harness (200) connected to the first DC charging socket (111).

11. A charging vehicle, comprising a second vehicle controller (301) and the second DC charging socket (302) according to claim 1, characterized in that: The second DC charging socket (302) is connected to the first DC charging socket (111) of the discharging vehicle (100) via a vehicle-to-vehicle charging harness (200); The second DC charging socket (302) is used to start the second vehicle controller (301) according to a determination signal output by the discharging vehicle (100) through the first DC charging socket (111); In the vehicle-to-vehicle charging mode, the charging current output by the range extender (107) of the discharging vehicle (100) is input into the charging vehicle (300) through the second DC charging socket (302).

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