Charging system of a donor vehicle by a recipient vehicle

Abstract

A system for charging a donor vehicle by a receiver vehicle, comprising a charging device (1) connected to the donor vehicle and the receiver vehicle by charging cables, the charging device (1) comprising connectors (2,3) for motor vehicle charging cable, a power converter (4) connected upstream to the first connector (2) and downstream to the second connector (3), an electronic control unit (6) connected to the power converter (4), to an electronic control unit (7) of the first connector and to an electronic control unit (8) of the second connector, the charging device (1) comprising a pre-charge power supply (10) connected to the first connector (2) by a pre-charge switch (IntPC), the electronic control unit (6), the pre-charge power supply (10) and the pre-charge switch (IntPC) being configured so as to satisfy the controls and checks prior to charging an electric vehicle,The power converter (4) is controlled to charge the receiving vehicle from the donor vehicle. Figure for the abbreviation: Fig 2,

Description

Title of the invention: System for charging a donor vehicle by a recipient vehicle Technical field

[0001] The technical field of the invention is the charging of electric or hybrid vehicles, in particular vehicle-to-vehicle charging. Previous techniques

[0002] The democratization of the electric vehicle is currently facing the problem of range anxiety. Due to the difficult accessibility of charging stations for electric vehicles, particularly in peri-urban areas, the driver of an electric vehicle is anxious at the idea of ​​no longer having enough energy to reach such a charging station, or that the charging station reached is unavailable while the charge level does not allow reaching another station.

[0003] This anxiety is exacerbated by the absence of a portable battery capable of recharging an electric vehicle whereas, with regard to thermal vehicles, refueling can be carried out using a petrol can which can be used to put fuel back in the tank.

[0004] To address this concern, vehicle-to-vehicle (V2V) charging has been developed. It involves transferring energy from a donor vehicle to a recipient vehicle to enable the latter to complete its journey or reach a charging station.

[0005] From the state of the prior art, document WO2022160544 is known describing such a V2V vehicle-to-vehicle charging solution. This solution is on-board and requires a set of components specifically dedicated to V2V vehicle-to-vehicle charging, both in the donor vehicle and in the recipient vehicle. This solution therefore involves a significant additional cost for each vehicle, which is particularly problematic for electric vehicles, the cost of which is already high.

[0006] Furthermore, the recharging must be fast enough to allow the receiving vehicle to be moved to a safe location and clear the roadway.

[0007] There is therefore a need for a vehicle-to-vehicle charging system that does not require modification or dedicated components in either the donor vehicle or the recipient vehicle. Statement of the invention

[0008] The subject of the invention is a system for charging a recipient vehicle by a donor vehicle, comprising a charging device connected to the donor vehicle. by a first charging cable and a first charging cable connector and to the receiving vehicle by a second charging cable and a second charging cable connector. The charging device comprises the first motor vehicle charging cable connector and the second motor vehicle charging cable connector, a power converter connected as an input to the first connector and as an output to the second connector, an electronic control unit connected to the power converter as well as to an electronic control unit of the first connector and to an electronic control unit of the second connector, the charging device comprising a pre-charging power supply connected by a pre-charging switch to the first charging cable connector, the pre-charging switch being connected to the electronic control unit, the electronic control unit,the pre-charge power supply and the pre-charge switch being configured to satisfy controls and verifications prior to charging an electric vehicle, the power converter being controlled to transfer energy from the donor vehicle to the recipient vehicle.

[0009] The pre-charge power supply can deliver in particular an adjustable voltage, in particular between 100 Volts and 500 Volts with a predefined maximum current, in particular of the order of 30 mA.

[0010] The charging device may include a first plurality of switches controlling the transfer of power between the first connector and the power converter, and a second plurality of switches controlling the transfer of power between the power converter and the second connector.

[0011] The electronic control unit of the first connector and / or the electronic control unit of the second connector may be provided to establish and supervise an AC alternating power transfer with the vehicle connected to the first connector and / or the second charging connector respectively, a DC-AC or AC-AC converter being provided in parallel with the power converter with switches arranged to divert the power current through the DC-AC or AC-AC converter.

[0012] The charging device may include a receiver and a transmitter configured to establish a connection with a remote server or a local device to enable reporting of usage statistics of the charging system.

[0013] The charging device may comprise a safety electronic control unit monitoring at least a portion of the currents and voltages of the charging system, as well as the proper operation of the electronic control unit, the safety electronic control unit being configured to interrupt the operation of the charging device via a set of switches as well as connections to the electronic control unit of the first connector, to the electronic control unit of the second connector and to the power converter.

[0014] At least one of the donor vehicle and the recipient vehicle may be a hybrid vehicle.

[0015] The pre-charge power supply may be connected via the pre-charge switch to the second charging cable connector, whereby a controlled relay is connected as an input to the pre-charge switch and as an output to the first charging cable connector and the second charging cable connector so as to direct the transfer of energy to one or the other of the charging cable connectors in order to perform an insulation test of the first charging cable and the second charging cable.

[0016] The invention also relates to a method for controlling charging carried out by at least one of the electronic control units of the charging system as described above, comprising the following steps:

[0017] a. The donor vehicle is connected,

[0018] b. A set of checks and negotiations are carried out to ensure the safety of the energy exchange, up to the completion of an insulation test of the charging cable,

[0019] c. The precharge switch is controlled so as to connect the precharge power supply to the first charging connector and satisfy the insulation test of the charging cable,

[0020] d. A message is sent to the donor vehicle via the electronic control unit of the first connector informing the vehicle that the insulation test is satisfied,

[0021] e. The battery voltage value of the donor vehicle is received and the pre-charge power supply is controlled so that it delivers a voltage equal to the battery voltage of the donor vehicle,

[0022] f. A message is received from the donor vehicle to validate the voltage measurement at the terminals of the charging cable, then, in return, a confirmation message is sent to the donor vehicle (Vd),

[0023] g. Energy is then received from the donor vehicle after closing at least one charging relay of the donor vehicle arranged between a charging cable connector of the donor vehicle and at least one battery, possibly via an on-board charger,

[0024] h. The receiving vehicle is connected,

[0025] i. A set of checks and negotiations are carried out in order to ensure the security of the energy exchange with the receiving vehicle,

[0026] j. The second plurality of switches are controlled so as to connect the power converter to the first charging connector in order to carry out a new insulation test of the charging cable, and satisfy the insulation test of the charging cable,

[0027] k. When the charging cable insulation test has been satisfied, energy is emitted to the receiving vehicle after closing at least one charging relay of the receiving vehicle arranged between a charging cable connector of the receiving vehicle and at least one battery, possibly via an on-board charger, the energy emission being regulated by controlling the closed-loop power converter as a function of a current setpoint equal to a current setpoint received from the receiving vehicle,

[0028] 1. When a predefined value of the state of charge of the receiving vehicle and / or the donor vehicle is reached, the energy transfer to the recipient vehicle is stopped and then the energy transfer from the donor vehicle is stopped. Brief description of the drawings

[0029] Other aims, characteristics and advantages of the invention will appear on reading the following description, given solely by way of non-limiting example and made with reference to the appended drawings in which:

[0030] - figure [Fig.l] illustrates a charging system according to the invention comprising a charging device connected to a donor vehicle and a recipient vehicle,

[0031] - figure [Fig.2] illustrates the main elements of a charging device according to the invention, and

[0032] - Figure [Fig.3] illustrates the main steps of a load control method executed by the electronic control units of a charging device according to the invention when charging a recipient vehicle from energy supplied by a donor vehicle. Detailed description

[0033] Figure [Fig.l] illustrates the charging system comprising a charging device 1 connected by a first charging cable to the donor vehicle Vd and by a second charging cable to the recipient vehicle Vr.

[0034] After safety checks as described in the standards IEC 61851-23 and IEC 61851-1, energy is transferred from the donor vehicle Vd to the recipient vehicle Vr via the charging cables and the charging device 1.

[0035] Figure [Fig.2] illustrates a charging device 1 according to the invention comprising a first connector 2 for a motor vehicle charging cable intended to be connected to the first charging cable and to the donor vehicle Vd and a second connector 3 for a motor vehicle charging cable intended to be connected to the second charging cable and to the receiving vehicle Vr. The first connector 2 and the second connector 3 are connected together via a power converter 4 and an electromagnetic compatibility filter 5.

[0036] More specifically, the first connector 2 for charging cable comprises two high voltage terminals through which it is connected to the power converter 4.

[0037] The first terminal is connected to a first terminal of a first switch Intl via a first set Mes_I_l of current and voltage sensors. The second terminal of the first switch Intl is connected to a first input El of the power converter 4.

[0038] The second terminal is connected to a first terminal of a switching circuit via a second set Mes_I_2 of current and voltage sensors. The second terminal of the switching circuit is connected to a second input E2 of the power converter 4.

[0039] The switching circuit comprises two branches in parallel, a first branch comprising a second switch Int2 connected in series with a resistor Rp and a second branch comprising a third switch Int 3.

[0040] A fourth switch Int 4 is connected in series to a resistor Rd, the assembly being connected in parallel with the inputs E1, E2 of the power converter 4.

[0041] A first output SI of the power converter 4 is connected to a first terminal of a fifth switch Int5 via an electronic compatibility filter 5. The second terminal of the fifth switch Int5 is connected to a first terminal of the second connector 3 for charging cable via a third set Mes_I_3 of current and voltage sensors.

[0042] A second output S2 of the power converter 4 is connected to a first terminal of a sixth switch Int6 via the electronic compatibility filter 5. The second terminal of the fifth switch Int5 is connected to a second terminal of the second connector 3 for charging cable via a fourth set Mes_I_4 of current and voltage sensors.

[0043] A diode DI is connected between the first input El and the first output SL. The anode of the diode DI is connected to the first output SI of the power converter 4, the cathode of the diode DI being connected to the first input El of the power converter 4.

[0044] A pre-charge power supply 10 is connected by a pre-charge switch IntPC between the second measuring means Mes_I_2 and the second terminal of the first connector 2 for charging cable. The pre-charge power supply 10 delivers in particular an adjustable voltage between 100 Volts and 500 Volts with a maximum current of 30 mA.

[0045] The first set Mes_I_l of current and voltage sensors and the second set Mes_I_2 of current and voltage sensors are connected to the electronic control unit 7 of the first connector.

[0046] The third set Mes_I_3 of current and voltage sensors and the fourth set Mes_I_4 of current and voltage sensors are connected to the electronic control unit 8 of the second connector.

[0047] The charging device 1 comprises an electronic control unit 6 connected to the power converter 4 as well as to an electronic control unit 7 of the first connector and to an electronic control unit 8 of the second connector by a dedicated data bus, of the CAN type (English acronym for “Common Area Network”).

[0048] The electronic control unit 6 is also connected to the first switch Int1, to the second switch Int2, to the third switch Int3 and to the fourth switch Int4 by individual connections through which the electronic control unit 6 emits a switching signal according to the control logic described below.

[0049] The electronic control unit 6 is furthermore connected to the fifth switch Int5 and to the sixth switch Int6 via a seventh switch Int7. The electronic control unit 6 emits a switching signal to these switches, when the switch Int7 is controlled to be on, and this according to the control logic described below.

[0050] The electronic control unit 6 is connected to a human machine interface (HMI) 13, such as a tablet, a smartphone or a computer, by a wireless connection (bluetooth®, wifi, etc.) or wired connection (serial connection, Ethernet, optical fiber, etc.) in order to exchange operating instructions or information.

[0051] The electronic control unit 6 is connected to the precharge switch IntPC to which it emits a switching signal according to the control logic described below and to the precharge power supply 10 of which it controls the output voltage and current.

[0052] The charging device 1 also comprises an electronic safety control unit 9 connected to the power converter 4 by at least one data connection, in particular of the CAN type, and by an emergency stop connection. An emergency stop device 11, such as a punch, is also connected to the power converter 4 by the emergency stop connection.

[0053] The electronic safety control unit 9 is also connected to a series of switches Intl, Int2, Int3, Int4 and Int7.

[0054] The electronic control unit 6 emits a switching signal to the first switch Int1, the second switch Int2 and the third switch Int3 to authorize the withdrawal of power from the donor vehicle Vd as soon as operational checks are satisfied. The control logic associated with such switching is explained below.

[0055] The electronic control unit 6 emits a switching signal to the fourth switch Int4 when an active discharge of the system is necessary. Such a discharge occurs at the end of charging of the receiving vehicle or following an error during the power transfer and consists of emptying the capacities of the power converter 4 in less than 5 seconds in order to comply with the requirements of the IEC 61851-23 standard.

[0056] The safety electronic control unit 9 is a redundant electronic control unit with respect to the electronic control unit 6, dedicated to safety. The safety electronic control unit 9 checks the states of the switches and the currents / voltages of the sensor sets mentioned above as well as additional information such as the internal temperature of the DC-DC or DC-AC converter. In the event of an error determined based on this information, it acts simultaneously with the electronic control unit 6 which does the same thing on its side.

[0057] The electronic safety control unit 9 emits a switching signal to the seventh switch Int7 in order to authorize the transmission of power to the receiving vehicle Vr as soon as operating checks are satisfied. The control logic associated with such switching is explained below. By default, the switch Int7 is commanded closed to authorize charging. In the event of a fault, the switch Int7 is open in order to cut off the power supply to the switches Int5 and Int6.

[0058] The electronic safety control unit 9 is connected by an emergency stop connection to the electronic control unit 7 of the first connector and by another emergency stop connection to the electronic control unit 8 of the second connector, in order to control the interruption of the operation of one or other of the electronic control units 6, 7 in the event of a fault occurring.

[0059] The electronic safety control unit 9 and the electronic control unit 6 are connected by a dedicated link, in particular an asynchronous link of the UART type (English acronym for “Universal Asynchronous Receiver Transmitter”) in order to confirm their respective operating state through a cross-talk type exchange.

[0060] The electronic safety control unit 9 is connected to a safety human machine interface (HMI) 12, in particular a strip of indicator lights making it possible to communicate a possible malfunction status to an operator.

[0061] The electronic control unit 6 manages the switching sequences of the different switches while checking the correct operation of each component. The electronic control unit 6 also supervises certain safety aspects related to current and voltage rereading or component temperature monitoring.

[0062] The electronic safety control unit 9 also monitors the current and voltage rereading or the temperature monitoring of the components.

[0063] As soon as the electronic control unit 6 or the electronic safety control unit 9 detects a fault, an emergency stop of the charging device 1 is triggered.

[0064] The electronic control unit 7 of the first connector as well as the electronic control unit 8 of the second connector are designed to initiate a high level communication HCL (acronym for "High Level Communication") with each vehicle connected by a charging cable to the corresponding connector. The high level communication HCL is similar to the high level communication HCL of a vehicle with a charging terminal, defined in particular by the standards DIN 70121 or ISO 15-118.

[0065] During this high-level HCL communication phase, each vehicle transmits its charging parameters (maximum admissible voltage, maximum admissible current, vehicle status) and the charging device transmits its own information to each vehicle (status, minimum and maximum operating voltage, peak value of maximum current oscillations “current ripple”) via the charging cable.

[0066] In a particular embodiment, an electronic control unit of the first AC connector and / or a control unit of the second AC connector are provided in order to establish and supervise an AC alternating power transfer with the vehicle connected to the charging connector that each of them supervises. In such an embodiment, an electronic control unit of the first AC connector is in particular a PWM (Pulse Width Modulation) communication card compatible with the IEC 61851-1 standard governing communications between a charging terminal and a vehicle. In such a case, a DC-AC or AC-AC converter is provided in parallel with the power converter 4. Alternatively, the power converter 4 is reconfigurable to switch from a DC-DC operating mode to a DC-AC or AC-AC operating mode.

[0067] In a particular embodiment, the charging device 1 is connected to a remote server to enable the uploading of usage statistics.

[0068] The actual control method will now be explained.

[0069] During a first step 21, the electronic control unit 6 emits a message to the user via the human-machine interface 13 indicating to connect the donor vehicle Vd.

[0070] When the donor vehicle Vd is connected, the method continues with a second step 22, during which the electronic control unit 6 commands the electronic control unit 7 of the first connector to initiate the energy exchange.

[0071] During a third step 23, the electronic control unit 7 of the first connector performs a set of checks and negotiations in accordance with the prior art in order to ensure the safety of the energy exchange, up to the performance of an insulation test of the charging cable. The checks and negotiations are in particular those provided for by the DIN SPEC 70121 or ISO 15118 standards. These are essentially messages on the capacities of the terminal and the vehicle so that they agree on the limits to be applied during the charging session. By determining for example the maximum voltage, the maximum current, the minimum voltage or the minimum current. The electronic control unit 7 of the first connector then informs the electronic control unit 6.

[0072] In a fourth step 24, the electronic control unit 6 controls the precharge switch IntPC so as to connect the precharge power supply 10 to the first charging connector and satisfy the charging cable insulation test. The charging cable insulation test consists of applying a voltage to the charging cable and checking the insulation of the charging system and the charging cable.

[0073] In a step 25, the electronic control unit 7 of the first connector informs the donor vehicle Vd that the insulation test has passed. In return, the donor vehicle Vd transmits the voltage of its battery. The charging device 1 adapts the voltage supplied by the pre-charging power supply at the first connector to the voltage level of the battery of the donor vehicle Vd.

[0074] During a step 26, the electronic control unit 6 then controls the precharge power supply 10 so that it delivers a voltage equal to the voltage of the donor vehicle battery Vd.

[0075] During a step 27, the vehicle validates the voltage measurement at the terminals of the charging cable, supplied by the pre-charging power supply 10 and the electronic control unit 7 of the first connector sends a confirmation message to the donor vehicle Vd.

[0076] During step 28, the donor vehicle Vd commands the closing of at least one of its charging relays in accordance with the expected operation according to the state of the art. The at least one charging relay is arranged between a charging cable connector of the donor vehicle and at least one battery, possibly via an on-board charger.

[0077] Due to the absence of power supplied from the charging device, power flows from the donor vehicle Vd to the charging device 1 contrary to the expected operation during charging. More precisely, the electronic control unit 6 controls the switch Int2 to perform the pre-charge and the switch Intl. The control unit number 6 then controls the closing of the switch Int3 and the opening of the switch Int2.

[0078] During a step 29, the electronic control unit 6 sends a message to the user via the human-machine interface 13 indicating the connection of the receiving vehicle Vr.

[0079] When the receiving vehicle Vr is connected, the method continues with a step 30, during which the electronic control unit 6 commands the electronic control unit 8 of the second connector to initiate charging.

[0080] During a step 31, the electronic control unit 8 of the second connector performs a set of checks and negotiations in accordance with the prior art in order to ensure the safety of the load.

[0081] Unlike steps 22 to 28, all of the checks are carried out as expected, in particular the insulation test of the charging cable. Indeed, since power is available at input E1, E2 of the power converter 4, the latter behaves like a charging terminal.

[0082] During a step 32, the receiving vehicle Vr commands the closing of at least one of its charging relays in accordance with the expected operation according to the state of the art. The at least one charging relay is arranged between a charging cable connector of the receiving vehicle and at least one battery, possibly via an on-board charger.

[0083] During a step 33, the electronic control unit 6 controls the power converter 4 so as to form a current regulation loop as a function of a current setpoint.

[0084] The electronic control unit 6 adjusts the current setpoint sent to the power converter 4 according to the needs of the receiving vehicle Vr obtained through communication with the electronic control unit 8 of the second connector, the electronic control unit 8 of the second connector itself communicating with the receiving vehicle Vr.

[0085] When the state of charge of the donor vehicle and / or the recipient vehicle reaches a predetermined value, the method continues with a step 34, during which the electronic control unit 6 terminates the energy transfer by interrupting the energy transfer to the recipient vehicle and then interrupting the energy transfer from the donor vehicle. The user can then disconnect the two charging cables if the absence of voltage is confirmed.

[0086] More precisely, the electronic control unit 6 sends a request to the electronic control unit 8 of the second connector to stop charging, which relays the command to the receiving vehicle Vr. The receiving vehicle Vr executes the request, stops its charging and pays the electronic control unit 8 of the second connector the received request. This information is reread by the electronic control unit 6 which commands the opening of the relays, fifth switch Int5 and sixth switch Int6. Once the relays are open, the electronic control unit 6 sends a request to the electronic control unit 7 of the first connector to stop charging on the donor vehicle Vd side. This request is transmitted and processed by the donor vehicle in a similar manner to the processing of the request by the receiving vehicle.The electronic control unit 6 then commands the opening of the switches Intl and Int3 to ensure the voltage is removed. The electronic control unit 6 finally controls the switch Int4 to discharge the power converter 4.

Claims

Claims

1. System for charging a receiving electric vehicle (Vr) by a donor electric vehicle (Vd), characterized in that it comprises a charging device (1) connected to the donor vehicle (Vd) by a first charging cable and a first charging cable connector (2), and to the receiving vehicle (Vr) by a second charging cable and a second charging cable connector (3), the charging device (1) comprising the first connector (2) for motor vehicle charging cable and the second connector (3) for motor vehicle charging cable, a power converter (4) connected at the input to the first connector (2) and at the output to the second connector (3), an electronic control unit (6) connected to the power converter (4) as well as to an electronic control unit (7) of the first connector and to an electronic control unit (8) of the second connector,the charging device (1) comprising a pre-charging power supply (10) connected by a pre-charging switch (IntPC) to the first charging cable connector (2), the pre-charging switch (IntPC) being connected to the electronic control unit (6), the electronic control unit (6), the pre-charging power supply (10) and the pre-charging switch (IntPC) being configured to satisfy checks and verifications prior to charging an electric vehicle, the power converter (4) being controlled to transfer energy from the donor vehicle (Vd) to the recipient vehicle (Vr).,

2. Charging system according to claim 1, in which the pre-charging power supply (10) delivers in particular an adjustable voltage, in particular between 100 Volts and 500 Volts, with a predefined maximum current, in particular of the order of 30 mA.

3. A charging system according to claim 1 or 2, wherein the charging device (1) comprises a first plurality of switches (Intl, Int2, Int3) controlling the power transfer between the first connector (2) and the power converter (4), and a second plurality of switches (Int5, Int6) controlling the power transfer between the power converter (4) and the second connector (3).

4. Charging system according to any one of claims 1 to 3, wherein the electronic control unit (7) of the first connector and / or the electronic control unit (8) of the second connector are provided to establish and supervise an AC alternating power transfer with the vehicle connected to the first connector (2) and the second charging connector (3) respectively, a DC-AC or AC-AC converter being provided in parallel with the power converter (4) with switches arranged to divert the power current through the DC-AC or AC-AC converter.

5. A charging system according to any one of claims 1 to 4, wherein the charging device (1) comprises a receiver and a transmitter configured to establish a connection with a remote server or a local device to enable reporting of usage statistics of the charging system.

6. A charging system according to any one of claims 1 to 5, wherein the charging device (1) comprises a safety electronic control unit (9) monitoring at least part of the currents and voltages of the charging system, as well as the correct operation of the electronic control unit (6), the safety electronic control unit (9) being configured to interrupt the operation of the charging device via a set of switches as well as connections to the electronic control unit (7) of the first connector, to the electronic control unit (8) of the second connector and to the power converter (4).

7. A charging system according to any one of claims 1 to 6, wherein at least one of the donor vehicle (Vd) and the recipient vehicle (Vr) is a hybrid vehicle.

8. A charging system according to any one of claims 1 to 6, wherein the precharge power supply is connected via the precharge switch to the second charging cable connector, a controlled relay being connected as an input to the precharge switch and as an output to the first charging cable connector and the second charging cable connector so as to direct the transfer of energy to one or the other of the charging cable connectors in order to carry out an insulation test of the first charging cable and the second charging cable.

9. A method of charging control performed by at least one of the electronic control units of the charging system according to any one of claims 1 to 8, comprising the following steps: a. Connect the donor vehicle, b. A set of checks and negotiations are carried out to ensure the safety of the energy exchange, up to the completion of an insulation test of the charging cable, c. The precharge switch (IntPC) is controlled so as to connect the precharge power supply (10) to the first charging connector and satisfy the insulation test of the charging cable, d. A message is sent to the donor vehicle (Vd) via the electronic control unit (7) of the first connector informing the vehicle that the insulation test has been satisfied, e. The donor vehicle battery voltage value (Vd) is received and the precharge power supply (10) is controlled so that it delivers a voltage equal to the donor vehicle battery voltage (Vd), f. A message is received from the donor vehicle (Vd) to validate the voltage measurement at the terminals of the charging cable, then, in return, a confirmation message is sent to the donor vehicle (Vd), g. Energy is then received from the donor vehicle (Vd) after closing at least one charging relay of the donor vehicle arranged between a charging cable connector of the donor vehicle and at least one battery, possibly via an on-board charger, h. Connect the receiving vehicle, i. A set of checks and negotiations are carried out to ensure the safety of the energy exchange with the receiving vehicle, j. The second plurality of switches (Int5, Int6) are controlled so as to connect the power converter (4) to the first charging connector in order to carry out a new insulation test of the charging cable, and satisfy the insulation test of the charging cable, k. When the charging cable insulation test has been satisfied, power is transmitted to the receiving vehicle (Vr) after closing at least one vehicle charging relay receiver arranged between a charging cable connector of the receiving vehicle and at least one battery, possibly via an on-board charger, the energy emission being regulated by controlling the power converter (4) in a closed loop as a function of a current setpoint equal to a current setpoint received from the receiving vehicle (Vr), 1. When a predefined value of the state of charge of the receiving vehicle (Vr) and / or the donor vehicle (Vd) is reached, the energy transfer to the receiving vehicle (Vr) is stopped and then the energy transfer from the donor vehicle (Vd) is stopped.

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