V2V Charging and Discharging Control and Guidance Method

Abstract

The present invention discloses a V2V charge and discharge control and guidance method, which is used for a discharging vehicle. The discharging vehicle is connected to an external charge and discharge connection device. A discharging vehicle control and guidance circuit is provided in the discharging vehicle. The charge and discharge connection device includes a wire harness control and guidance circuit, and the wire harness control and guidance circuit includes a wire harness capacity identification resistor. The discharging vehicle control and guidance circuit includes a first resistor. The first end of the first resistor is connected to a first power supply, and the second end of the first resistor is connected to the second end of the wire harness capacity identification resistor. The second end of the first resistor is configured as a first charge and discharge detection point. The method includes: obtaining a first actual voltage at the first charge and discharge detection point; determining a first target preset voltage range into which the first actual voltage falls; and determining the wire harness capacity of the connecting wire harness according to the first target preset voltage range. The V2V charge and discharge control and guidance method of the present application enables the discharging device to identify the cable capacity and improves the safety of charge and discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging and discharging, and particularly to a V2V charging and discharging control guiding method. Background Art

[0002] During charging and discharging, a charging and discharging connection device connects a discharging vehicle and a charging vehicle, and a phenomenon that the charging and discharging connection device is burned out occurs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the object of the present invention is to provide a V2V charging and discharging control guiding method, which can enable a discharging vehicle to identify the cable capacity and improve the safety of charging and discharging.

[0004] To achieve the above object, the V2V charging and discharging control guiding method according to an embodiment of the present invention is applied to a discharging vehicle. The discharging vehicle is connected to an external charging and discharging connection device. A discharging vehicle control guiding circuit is provided in the discharging vehicle. The charging and discharging connection device includes a connection wire harness and a wire harness control guiding circuit. The wire harness control guiding circuit includes a wire harness capacity identification resistor. The first end of the wire harness capacity identification resistor is connected to the vehicle body ground. The discharging vehicle control guiding circuit includes a first resistor. The first end of the first resistor is connected to a first power supply. The second end of the first resistor is connected to the second end of the wire harness capacity identification resistor. The second end of the first resistor is configured as a first charging and discharging detection point. The V2V charging and discharging control guiding method includes: obtaining a first actual voltage of the first charging and discharging detection point; determining a first target preset voltage range in which the first actual voltage falls; and determining the wire harness capacity of the connection wire harness according to the first target preset voltage range.

[0005] According to the V2V charging and discharging control guiding method of the present invention, based on the wire harness capacity identification resistor provided in the charging and discharging connection device, during V2V charging and discharging, the voltage across the wire harness capacity identification resistor or the current flowing through the wire harness capacity identification resistor can be detected at the first charging and discharging detection point of the discharging vehicle, so as to obtain the overload capacity (the capacity of the connection wire harness) of the connection wire harness in the charging and discharging connection device, which can be utilized by the discharging vehicle, so that the discharging vehicle outputs an electrical signal not exceeding the overload capacity of the connection wire harness, avoiding the phenomenon that the connection wire harness is overloaded and burned out, and improving the safety of charging and discharging.

[0006] In some embodiments, determining the harness capacity of the connection harness according to the first target preset voltage range includes: when the first target preset voltage range is a first voltage range, determining the harness capacity of the connection harness as a first capacity; or, when the first target preset voltage range is a second voltage range, determining the harness capacity of the connection harness as a second capacity, where the voltage value of the second voltage range is less than the voltage value of the first voltage range, and the second capacity is greater than the first capacity; or, when the first target preset voltage range is a third voltage range, determining the harness capacity of the connection harness as a third capacity, where the voltage value of the third voltage range is less than the voltage value of the second voltage range, and the third capacity is greater than the second capacity.

[0007] In some embodiments, the connection harness includes a DC+ line and a DC- line. Determining the harness capacity of the connection harness according to the first target preset voltage range includes: determining the harness capacity of at least one of the DC+ line and the DC- line according to the first target preset voltage range and a voltage-capacity correspondence table.

[0008] In some embodiments, the discharge vehicle control and guidance circuit further includes a first switch. A first end of the first switch is connected to a second end of the first resistor, and a second end of the first switch is connected to a second end of the harness capacity identification resistor; the V2V control and guidance method further includes: in response to a charge and discharge control instruction, controlling the first switch to close to obtain the voltage at the first charge and discharge detection point.

[0009] In some embodiments, the charge and discharge connection device is further connected to a charging vehicle. The charging vehicle includes a charging vehicle control and guidance circuit, and the charging vehicle control and guidance circuit includes a fifth resistor. A first end of the fifth resistor is connected to the vehicle body ground; the discharge vehicle control and guidance circuit includes a second resistor. A first end of the second resistor is connected to a second power supply; the harness control and guidance circuit further includes a third resistor, a fourth resistor, and a second switch. A first end of the second switch in parallel with the third resistor is connected to the vehicle body ground, and a second end of the second switch in parallel with the third resistor is connected to a first end of the fourth resistor. A second end of the fourth resistor is connected to a second end of the second resistor, and the second end of the second resistor is configured as a second charge and discharge detection point; the harness control and guidance circuit further includes a third switch. A first end of the third switch is connected to a second end of the fifth resistor, and a second end of the third switch is connected to the second charge and discharge detection point; the V2V control and guidance method further includes: obtaining a second actual voltage at the second charge and discharge detection point; determining a second target preset voltage range in which the second actual voltage falls; and determining the connection state of the charge and discharge connection device with the discharge vehicle and the charging vehicle according to the second target preset voltage range.

[0010] In some embodiments, determining the connection states of the charge-discharge connection device with the discharging vehicle and the charging vehicle according to the second target preset voltage range includes:

[0011] When the second target preset voltage range is the fourth voltage range, it is determined that the charge-discharge connection device is in a semi-connected state with the discharging vehicle, and the charge-discharge connection device is in a non-connected state or a semi-connected state with the charging vehicle;

[0012] Alternatively, when the second target preset voltage range is the fifth voltage range, it is determined that the charge-discharge connection device is in a fully-connected state with the discharging vehicle, and the charge-discharge connection device is in a non-connected state or a semi-connected state with the charging vehicle, where the voltage value of the fifth voltage range is less than the voltage value of the fourth voltage range;

[0013] Alternatively, when the second target preset voltage range is the sixth voltage range, it is determined that the charge-discharge connection device is in a semi-connected state with the discharging vehicle, and the charge-discharge connection device is in a fully-connected state with the charging vehicle, where the voltage value of the sixth voltage range is greater than the voltage value of the fifth voltage range;

[0014] Alternatively, when the second target preset voltage range is the seventh voltage range, it is determined that the charge-discharge connection device is in a fully-connected state with the discharging vehicle, and the charge-discharge connection device is in a fully-connected state with the charging vehicle, where the voltage value of the seventh voltage range is less than the voltage value of the fifth voltage range.

[0015] In some embodiments, before determining the wire harness capacity of the connection wire harness according to the first target preset voltage range, the method further includes: determining that the charge-discharge connection device is in a fully-connected state with the discharging vehicle according to the second target preset voltage range.

[0016] In some embodiments, the charge-discharge connection device further includes a first electronic lock module, the first electronic lock module includes a first power supply terminal and a first switch unit, the first power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the charging vehicle; the charge-discharge connection device further includes a second electronic lock module, the second electronic lock module includes a second power supply terminal and a second switch unit, the second power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the discharging vehicle, the first switch unit and the second switch unit are connected in series between the S+ connection terminal of the discharging vehicle and the S+ connection terminal of the charging vehicle; the discharging vehicle includes a power switch, the power switch is connected to the battery and the A+ connection terminal of the discharging vehicle, or, the power switch is connected to the battery and the A- connection terminal of the discharging vehicle; the V2V charge-discharge control and guidance method further includes: determining that the charge-discharge connection device is in a fully connected state with the discharging vehicle and the charging vehicle; the discharging vehicle controls the power switch to close to power on the first power supply terminal and the second power supply terminal; controlling the first switch unit to close to keep the third switch in a closed state, and, controlling the second switch unit to close to keep the second switch in a closed state.

[0017] In some embodiments, the charge-discharge connection device further includes a first electronic lock module, the first electronic lock module includes a first power supply terminal and a first switch unit, the first power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the charging vehicle, the first end of the first switch unit is connected to the second end of the sixth resistor, the second end of the first switch unit is connected to the third charge-discharge detection point; the charge-discharge connection device further includes a second electronic lock module, the second electronic lock module includes a second power supply terminal and a second switch unit, the second power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the discharging vehicle, the first end of the second switch unit is connected to the second end of the third resistor, the second end of the second switch unit is connected to the second charge-discharge detection point; the charge-discharge connection device further includes an eighth resistor and a ninth resistor, the eighth resistor is connected in parallel with the first switch unit, the ninth resistor is connected in parallel with the second switch unit; the discharging vehicle includes a power switch, the power switch is connected to the battery and the A+ connection terminal of the discharging vehicle, or, the power switch is connected to the battery and the A- connection terminal of the discharging vehicle; the V2V charge-discharge control and guidance method further includes: determining that the charge-discharge connection device is in a fully connected state with the discharging vehicle and the charging vehicle; the discharging vehicle controls the power switch to close to power on the first power supply terminal and the second power supply terminal; controlling the first switch unit to close to keep the third switch in a closed state, and, controlling the second switch unit to close to keep the second switch in a closed state.

[0018] In some embodiments, identifying the capacity of the connection cable harness and identifying the connection states of the charge-discharge connection device with the discharging vehicle and the charging vehicle are performed simultaneously, or, after identifying the capacity of the connection cable harness, the connection states of the charge-discharge connection device with the discharging vehicle and the charging vehicle are identified, or, after identifying the connection states of the charge-discharge connection device with the discharging vehicle and the charging vehicle, the capacity of the connection cable harness is identified; wherein, the connection states include any one of a fully connected state, a semi-connected state, and a non-connected state.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a circuit diagram of a V2V charge-discharge system according to an embodiment of the present invention;

[0022] Figure 2 is a flowchart of a V2V charge-discharge control guidance method according to an embodiment of the present invention;

[0023] Figure 3 is a circuit diagram of a V2V charge-discharge system according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0025] The V2V charge-discharge control guidance method according to an embodiment of the present invention will be described below with reference to the drawings. The V2V charge-discharge control guidance method of the embodiment of the present invention is used for a discharging vehicle, and the discharging vehicle is connected to an external charge-discharge connection device. As Figure 1 shown, it is a schematic diagram of a control guidance circuit of a V2V charge-discharge system according to an embodiment of the present invention. A discharging vehicle control guidance circuit is provided in the discharging vehicle 20, and the charge-discharge connection device 10 includes a connection cable harness and a harness control guidance circuit. As Figure 1As shown, the harness control and guidance circuit includes a harness capacity identification resistor R0. The first end of the harness capacity identification resistor R0 is connected to the vehicle body ground. The discharge vehicle control and guidance circuit includes a first resistor R1. The first end of the first resistor R1 is connected to a first power supply U1. The second end of the first resistor R1 is connected to the second end of the harness capacity identification resistor R0. The second end of the first resistor R1 is configured as a first charge and discharge detection point 1. Among them, there are multiple vehicle body ground terminals in the discharge vehicle, the charging vehicle, and the charge and discharge connection device. In order to ensure that the potentials of the charging vehicle and the discharge vehicle are equal, the multiple vehicle body ground terminals are connected. For example Figure 1 the PE line in

[0026] Among them, the harness capacity identification resistor R0 is used to identify the harness capacity of the connecting harness of the charge and discharge connection device 10. The harness capacity can refer to the current magnitude that the harness can withstand. Exceeding this harness capacity is likely to cause the harness to burn out. The harness capacity is related to factors such as the harness length, thickness, and material used.

[0027] It should be noted that the control and guidance circuit refers to the circuit for signal transmission or communication between the charging vehicle and the discharge vehicle. The control and guidance function refers to the function for monitoring the interaction between the charging vehicle and the discharge vehicle. The control and guidance circuit can guide the charge and discharge interaction connection between the discharge vehicle and the charging vehicle.

[0028] Figure 2 is a flowchart of a V2V charge and discharge control and guidance method according to an embodiment of the present invention. As Figure 2 shown, the method of the embodiment of the present invention at least includes step S1 and step S2.

[0029] S1, obtain the first actual voltage of the first charge and discharge detection point.

[0030] S2, determine the first target preset voltage range into which the first actual voltage falls.

[0031] Specifically, compare the first actual voltage with the voltage values of multiple preset voltage ranges to determine the preset voltage range into which the first actual voltage falls as the first target preset voltage range.

[0032] S3, determine the harness capacity of the connecting harness according to the first target preset voltage range.

[0033] Specifically, for the same vehicle, the resistance value of the first resistor R1 of the discharge vehicle 20 is a fixed value. The actual voltage of the first charge and discharge detection point 1 is related to the resistance value of the harness capacity identification resistor R0. The harness capacities of different connecting harnesses are different, and different resistance values of the harness capacity identification resistor R0 can be selected. Different resistance values of the harness capacity identification resistor R0 result in different voltages at the first charge and discharge detection point 1. Thus, the harness capacity of the connecting harness can be identified by the voltage at the first charge and discharge detection point 1.

[0034] In some embodiments, as Figure 1 shown, a resistor R11 is provided in the socket of the discharging vehicle. The resistance values of the first resistor R1 and the resistor R11 are constant values. The voltage value at the detection point 1 is (R11*R0 / (R11+R0)) / (R11*R0 / (R11+R0)+R1)*U1. Since the resistance value of the harness capacity identification resistor R0 is different, the voltage value at the first charge and discharge detection point 1 is also different. Therefore, for the connecting harnesses with different harness capacities of the charge and discharge connection device 10, different resistance values of the harness capacity identification resistance R6 can be set for distinction.

[0035] Specifically, the vehicle controller can pre-store the correspondence between the voltage range at the first charge and discharge detection point 1 and the harness capacity. After determining the voltage range (i.e., the first target preset voltage range) into which the actual voltage at the first charge and discharge detection point 1 falls, the harness capacity corresponding to the first target preset voltage range is determined as the harness capacity of the connecting harness of the charge and discharge connection device.

[0036] During V2V charge and discharge, the harness capacity of the connecting harness is determined according to the voltage at the first charge and discharge detection point for use by the discharging vehicle. The charge and discharge current is controlled according to the capacity of the connecting harness, so that the discharging vehicle outputs an electrical signal not exceeding the overload capacity of the connecting harness, avoiding the phenomenon of the connecting harness being overloaded and burned, and improving the charge and discharge safety.

[0037] Moreover, in the embodiment, only the harness capacity identification resistor R0 can be provided between the vehicle body ground (such as the PE line) and the first charge and discharge detection point 1. The electrical parameters (voltages) corresponding to different resistance values vary greatly, which is easy to identify, can more accurately identify the size of the harness capacity, and avoid misjudgment of the size of the harness capacity.

[0038] In the embodiment, the correspondence between the voltage at the first charge and discharge detection point 1 and the harness capacity is pre-stored. Taking the harness capacity in three gears as an example, the first voltage range corresponds to the first capacity, the second voltage range corresponds to the second capacity, and the third voltage range corresponds to the third capacity. Among them, the voltage value in the second voltage range is less than the voltage value in the first voltage range, the second capacity is greater than the first capacity, the voltage value in the third voltage range is less than the voltage value in the second voltage range, and the third capacity is greater than the second capacity.

[0039] Specifically, if the obtained first target preset voltage range is the first voltage range, the harness capacity of the connecting harness is determined to be the first capacity. For example, if the first voltage range is 7.8V - 8.2V and the actual voltage at the first charge and discharge detection point 1 is 8V, the harness capacity of the connecting harness is determined to be the first capacity, such as 80A.

[0040] Alternatively, if the first target preset voltage range is the second voltage range, then determine that the wire harness capacity of the connection wire harness is the second capacity. For example, if the second voltage range is 5.8V - 6.2V and the actual voltage of the first charge and discharge detection point 1 is 6V, then determine that the wire harness capacity of the connection wire harness is the second capacity, such as 125A.

[0041] Alternatively, if the first target preset voltage range is the third voltage range, then determine that the wire harness capacity of the connection wire harness is the third capacity. For example, if the third voltage range is 3.5V - 4V and the actual voltage of the first charge and discharge detection point 1 is 3.7V, then determine that the wire harness capacity of the connection wire harness is the third capacity, such as 200A.

[0042] Thus, the wire harness capacity of the charge and discharge connection device can be determined according to the voltage range in which the actual voltage of the first charge and discharge detection point 1 falls, and then it can be used by the discharging vehicle to control the charge and discharge current, so that the discharging vehicle outputs an electrical signal not exceeding the overload capacity of the connection wire harness, avoiding the phenomenon that the connection wire harness is overloaded and burned.

[0043] In some embodiments, as Figure 1 shown, the connection wire harness includes a DC+ wire and a DC- wire. The DC+ wire and the DC- wire represent high-voltage power lines, which are used to transmit the electric energy output by the power battery 01 or the power battery 05, realizing the electric energy transmission between the discharging vehicle and the charging vehicle for charge and discharge. The resistance value of the wire harness capacity identification resistor R0 can be set based on the wire harness capacity of the DC+ wire and / or the DC- wire. During charge and discharge, determine the first target preset voltage range in which the actual voltage of the first charge and discharge detection point 1 falls; determine the wire harness capacity of at least one of the DC+ wire and the DC- wire according to the first target preset voltage range in which the actual voltage of the first charge and discharge detection point 1 falls.

[0044] Specifically, since the resistance value of the resistor in the control and guidance circuit of the discharging vehicle is a fixed value, for wire harness capacity identification resistors R0 with different resistance values, the actual voltage at the first charge and discharge detection point 1 collected is different, and the wire harness capacity identification resistor R0 defines different wire harness capacities. Therefore, a correspondence relationship between the wire harness capacity and the voltage range of the first charge and discharge detection point 1 can be established. For connection wire harnesses with different capacities, wire harness capacity identification resistors R0 with different resistance values are set in the wire harness control and guidance circuit. By determining the first target preset voltage range where the voltage of the first charge and discharge detection point 1 is located, the wire harness capacity of the DC+ wire and / or the DC- wire can be identified. Then, the discharging vehicle controls the magnitude of the current during charge and discharge according to the capacity of the DC+ wire or the DC- wire, so that the discharging vehicle outputs an electrical signal not exceeding the overload capacity of the connection wire harness, avoiding the phenomenon that the DC+ wire or the DC- wire is overloaded and burned, and improving the safety of charge and discharge.

[0045] As Figure 1As shown, the discharge vehicle control and guidance circuit further includes a first switch K1. The first end of the first switch K1 is connected to the second end of the first resistor R1, and the second end of the first switch K1 is connected to the second end of the wire harness capacity identification resistor R0. During V2V charging and discharging, in response to the charging and discharging control instruction, the first switch K1 is controlled to close to obtain the voltage at the first charging and discharging detection point. That is, when the user activates the DC external discharge function on the discharge vehicle, the discharge vehicle closes the first switch K1, and the whole vehicle can enter the discharge process, such as identifying the wire harness capacity, etc.

[0046] As Figure 1 As shown, the discharge vehicle control and guidance circuit includes a second resistor R2. The first end of the second resistor R2 is connected to the second power supply U2; the wire harness control and guidance circuit further includes a third resistor R3, a fourth resistor R4, and a second switch S2. The first end of the second switch S2 in parallel with the third resistor R3 is connected to the vehicle body ground, such as the PE line, and the second end of the second switch S2 in parallel with the third resistor R3 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the second end of the second resistor R2, and the second end of the second resistor R2 is configured as the second charging and discharging detection point 2.

[0047] As Figure 1 As shown, the charging and discharging connection device 10 is further connected to the charging vehicle 30. The charging vehicle 30 includes a charging vehicle control and guidance circuit. The charging vehicle control and guidance circuit includes a fifth resistor R5. The first end of the fifth resistor R5 is connected to the vehicle body ground, such as the PE line; the wire harness control and guidance circuit further includes a third switch S3. The first end of the third switch S3 is connected to the second end of the fifth resistor R5, and the second end of the third switch S3 is connected to the second charging and discharging detection point 2.

[0048] In the embodiment, the second actual voltage at the second charging and discharging detection point 2 is obtained; the second target preset voltage range in which the second actual voltage falls is determined, and the connection states of the charging and discharging connection device 10 with the discharge vehicle 20 and the charging vehicle are determined according to the second target preset voltage range.

[0049] Among them, the connection states between the charge and discharge connection device 10 and the discharge vehicle 20 include a non-connected state, a semi-connected state, and a fully-connected state. The non-connected state means that the second plug 2 of the charge and discharge connection device 10 is not inserted or not reliably inserted into the socket 21 of the discharge vehicle 20; the semi-connected state means that the second plug 2 of the charge and discharge connection device 10 has been inserted into the socket 21 of the discharge vehicle 20, but the mechanical lock on the second plug 2 has been pressed. For example, when the mechanical lock corresponds to a normally-closed switch, the normally-closed switch is in an open state at this time; the fully-connected state means that the second plug 2 of the charge and discharge connection device 10 has been inserted into the socket 21 of the discharge vehicle 20, and the mechanical lock on the second plug 2 has not been pressed. For example, when the mechanical lock corresponds to a normally-closed switch, the normally-closed switch is in a closed state at this time. Among them, in the semi-connected state, there is no mechanical lock between the second plug 2 of the charge and discharge connection device 10 and the socket 21 of the discharge vehicle 20, while in the fully-connected state, there is a structural lock between the second plug 2 of the charge and discharge connection device 10 and the socket 21 of the discharge vehicle 20. When the mechanical lock is pressed, the locking structure is unlocked, and the second plug 2 becomes in the semi-connected state, and at this time, the second plug 2 can be plugged and unplugged.

[0050] Similarly, the connection states between the charge and discharge connection device 10 and the charging vehicle 30 include a non-connected state, a semi-connected state, and a fully-connected state. The non-connected state means that the first plug 1 of the charge and discharge connection device 10 is not inserted or not reliably inserted into the socket 22 of the charging vehicle 30; the semi-connected state means that the first plug 1 of the charge and discharge connection device 10 has been inserted into the socket 22 of the charging vehicle 30, but the mechanical lock on the first plug 1 has been pressed. For example, when the mechanical lock corresponds to a normally-closed switch, the normally-closed switch is in an open state at this time; the fully-connected state means that the first plug 1 of the charge and discharge connection device 10 has been inserted into the socket 22 of the charging vehicle 30, and the mechanical lock on the first plug 1 has not been pressed. For example, when the mechanical lock corresponds to a normally-closed switch, the normally-closed switch is in a closed state at this time. Among them, in the semi-connected state, there is no mechanical lock between the first plug 1 of the charge and discharge connection device 10 and the socket 22 of the charging vehicle 30, while in the fully-connected state, there is a structural lock between the first plug 1 of the charge and discharge connection device 10 and the socket 22 of the charging vehicle 30. When the mechanical lock is pressed, the locking structure is unlocked, and the first plug 1 becomes in the semi-connected state, and at this time, the first plug 1 can be plugged and unplugged.

[0051] Specifically, pre-store the correspondence between the voltage range at the second charge and discharge detection point 2 and the connection state. When charging and discharging are connected, detect the voltage at the second charge and discharge detection point 2. The vehicle controller compares the second actual voltage at the second charge and discharge detection point 2 with the voltage values of multiple preset voltage ranges, determines the second target preset voltage range into which the second actual voltage at the second charge and discharge detection point 2 falls, and determines the connection state corresponding to the second target preset voltage range, which is the connection state between the charge and discharge connection device 10 and the discharge vehicle 20 and the charging vehicle 30.

[0052] Taking the control and guidance circuit shown below Figure 1 as an example, the connection state of the charge and discharge connection device 10 with the discharge vehicle 20 and the charge vehicle 30 is identified according to the second actual voltage of the second charge and discharge detection point 2.

[0053] Among them, if the second target preset voltage range is the value range of the second power supply voltage, it is determined that the charge and discharge connection device 10 and the discharge vehicle 20 are in a non-connected state.

[0054] In some embodiments, if the second target preset voltage range is the fourth voltage range, it is determined that the charge and discharge connection device 10 and the discharge vehicle 20 are in a semi-connected state, and the charge and discharge connection device 10 and the charge vehicle 30 are in a non-connected state or a semi-connected state. For example, the fourth voltage range is 9.8V - 10.2V. When charging and discharging are connected, if the second actual voltage of the second charge and discharge detection point 2 detected is (R4 + R3) / (R4 + R3 + R2)*U2 = 10V, and this second actual voltage falls within the fourth voltage range, then at this time the second switch S2 is disconnected, that is, the charge and discharge connection device and the discharge vehicle are in a semi-connected state. And at this time, the third switch S3 is disconnected. Through the second actual voltage of the second charge and discharge detection point 2, it can only be determined that the charge and discharge connection device 10 and the charge vehicle 30 are in a non-connected state or a semi-connected state. As for the actual connection state of the charge and discharge connection device 10 and the charge vehicle 30, it can be further judged with reference to the detection of the charge vehicle, and there is relevant description below.

[0055] Or, the second target preset voltage range is the fifth voltage range, it is determined that the charge and discharge connection device and the discharge vehicle are in a fully connected state, and the charge and discharge connection device and the charge vehicle are in a non-connected state or a semi-connected state, where the voltage value of the fifth voltage range is less than the voltage value of the fourth voltage range. For example, the fifth voltage range is 5.8V - 6.2V. When charging and discharging are connected, if the second actual voltage of the second charge and discharge detection point 2 detected is R4 / (R4 + R2)*U2 = 6V, and the second actual voltage falls within the fifth voltage range. At this time, the second plug 2 of the charge and discharge connection device 10 has been inserted into the socket 21 of the discharge vehicle 20, the second switch S2 is in a closed state, and there is a structural lock between the second plug 2 of the charge and discharge connection device 10 and the socket 21 of the discharge vehicle 20, that is, the charge and discharge connection device 10 and the discharge vehicle 20 are in a fully connected state; and the third switch S3 is in a disconnected state. Through the second actual voltage of the second charge and discharge detection point 2, it can only be determined that the charge and discharge connection device and the charge vehicle are in a non-connected state or a semi-connected state. As for the actual connection state of the charge and discharge connection device and the charge vehicle, it can be further judged with reference to the detection of the charge vehicle, and there is relevant description below.

[0056] Alternatively, if the second target preset voltage range is the sixth voltage range, it is determined that the charging and discharging connection device is in a semi-connected state with the discharging vehicle and in a fully-connected state with the charging vehicle, where the voltage value of the sixth voltage range is greater than that of the fifth voltage range. For example, the sixth voltage range is 6.8V - 7.2V. During charging and discharging connection, if the second actual voltage of the second charging and discharging detection point 2 is 7V and the second actual voltage falls within the sixth voltage range, at this time, the second plug 2 of the charging and discharging connection device 10 has been inserted into the socket 21 of the discharging vehicle 20, the second switch S2 is in the off state, and there is no structural locking between the second plug 2 of the charging and discharging connection device 10 and the socket 21 of the discharging vehicle 20, that is, the charging and discharging connection device 10 is in a semi-connected state with the discharging vehicle 20; and the first plug 1 of the charging and discharging connection device 10 has been inserted into the charging vehicle 30, and there is structural locking between the first plug 1 and the socket 31 of the charging vehicle 30, and the third switch S3 is in the closed state, that is, the charging and discharging connection device is in a fully-connected state with the charging vehicle 30.

[0057] Alternatively, the second target preset voltage range is the seventh voltage range, and it is determined that the charging and discharging connection device 10 is in a fully-connected state with the discharging vehicle 20 and in a fully-connected state with the charging vehicle 30, where the voltage value of the seventh voltage range is less than that of the fifth voltage range. For example, the seventh voltage range is 4.5V - 5V. During charging and discharging connection, if the second actual voltage of the second charging and discharging detection point 2 is 4.8V and the second actual voltage falls within the seventh voltage range, at this time, the second plug 2 of the charging and discharging connection device 10 has been inserted into the socket 21 of the discharging vehicle 20, the second switch S2 is in the closed state, and there is structural locking between the second plug 2 of the charging and discharging connection device 10 and the socket 21 of the discharging vehicle 20, that is, the charging and discharging connection device 10 is in a fully-connected state with the discharging vehicle 20; and the first plug 1 of the charging and discharging connection device 10 has been inserted into the charging vehicle 30, and there is structural locking between the first plug 1 and the socket 31 of the charging vehicle 30, and the third switch S3 is in the closed state, that is, the charging and discharging connection device 10 is in a fully-connected state with the charging vehicle 30.

[0058] From the above, it is possible to determine whether the charging and discharging connection device 10 is in a non-connected state or a semi-connected state with the charging vehicle 30 according to the voltage range in which the second actual voltage of the second charging and discharging detection point 2 falls. Further, it is possible to identify the non-connected state and semi-connected state of the charging and discharging connection device 10 with the charging vehicle by combining the detection on the charging vehicle side.

[0059] In the embodiment, as Figure 1As shown, the wiring harness control and guidance circuit further includes a sixth resistor R6, and the first end of the sixth resistor R6 is connected to the vehicle body ground, such as the PE wire; the charging vehicle control and guidance circuit further includes a seventh resistor R7, the first end of the seventh resistor R7 is connected to the third power supply U3, the second end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, and the second end of the seventh resistor R7 is configured as the third charge and discharge detection point 3.

[0060] During V2V charge and discharge connection, according to the second actual voltage of the second charge and discharge detection point 2, it is determined that the charge and discharge connection device 10 and the charging vehicle 30 are in a non-connected state or a semi-connected state. Further, the third actual voltage of the third charge and discharge detection point 3 is obtained; according to the third actual voltage of the third charge and discharge detection point 3 and the second actual voltage of the second charge and discharge detection point 2, the actual connection state between the charge and discharge connection device 10 and the charging vehicle 30 is determined.

[0061] For example, as Figure 1 shown, the voltage of the third charge and discharge detection point is the third power supply voltage U3. At this time, the sixth resistor R6 in the wiring harness control and guidance circuit is not incorporated into the circuit of the third charge and discharge detection point 3 on the charging vehicle side, so it is determined that the charge and discharge connection device and the charging vehicle are actually in a non-connected state.

[0062] Or, since the second connection confirmation terminal defined in the DC interface is longer than the first connection confirmation terminal, when the first plug 1 of the charge and discharge connection device 10 is not fully inserted into the socket 22 of the charging vehicle 20, there is a situation where the second connection confirmation terminal of the first plug 1 of the charge and discharge connection device 10 is connected while the first connection confirmation terminal is not connected. At this time, the third switch S3 is in the off state. The discharging vehicle determines that the second plug 2 is not connected or semi-connected through the preset voltage range into which the second actual voltage of the second charge and discharge detection point 2 falls, while the charging vehicle determines that the first plug 22 of the charge and discharge connection device 10 is connected to the charging vehicle socket 22 through the detection voltage of the third charge and discharge detection point 3. Therefore, at this time, the charge and discharge connection device 10 and the charging vehicle 30 are actually in a semi-connected state.

[0063] For example, as Figure 1 shown, the third actual voltage of the third charge and discharge detection point 3 is the eighth voltage = R7 / (R6 + R7)*U3, then it is determined that the first plug 1 of the charge and discharge connection device 10 is inserted into the charging vehicle 30, and the discharging vehicle 20 determines that the second actual voltage of the second charge and discharge detection point 2 falls within the fourth voltage range or the fifth voltage range, that is, at this time the third switch S3 is in the off state, then the charging vehicle determines that the charge and discharge connection device 10 and the charging vehicle 30 are actually in a semi-connected state. Therefore, according to the second actual voltage of the second charge and discharge detection point 2 and the third actual voltage of the third charge and discharge detection point 3, it can be determined whether the charge and discharge connection device and the charging vehicle are in a semi-connected state.

[0064] Furthermore, in order to improve the safety of the charge and discharge connection, in some embodiments of the present invention, the mechanical locks of the second switch S2 and the third switch S3 are maintained in a locked state by an electronic locking module, so as to maintain the charge and discharge connection device in a fully connected state with the discharging vehicle and the charging vehicle.

[0065] In some embodiments, as Figure 1 shown, the charge and discharge connection device 10 further includes a first electronic lock module 5. The first electronic lock module 5 includes a first power supply terminal and a first switch unit S01. The first power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the charging vehicle 30. The charge and discharge connection device 10 further includes a second electronic lock module 6. The second electronic lock module 6 includes a second power supply terminal and a second switch unit 02. The second power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the discharging vehicle 20. The first switch unit S01 and the second switch unit S02 are connected in series between the S+ connection terminal of the discharging vehicle 20 and the S+ connection terminal of the charging vehicle 30. The discharging vehicle 20 includes a power switch KA1. The power switch KA is connected to the battery 04 and the A+ connection terminal of the discharging vehicle 20, or the power switch KA is connected to the battery 04 and the A- connection terminal of the discharging vehicle 20.

[0066] The first electronic lock module 5 is used to lock the third switch S3 when the charge and discharge connection device 10 is fully connected to the charging vehicle 30, so that the third switch S3 maintains a closed state. The second electronic lock module 6 is used to lock the second switch S2 when the charge and discharge connection device 10 is fully connected to the discharging vehicle 20, so that the second switch S2 maintains a closed state and cannot be operated.

[0067] Specifically, based on the above connection state recognition process, it is determined that the charge and discharge connection device 10 is in a fully connected state with both the discharging vehicle 20 and the charging vehicle 30. The discharging vehicle 20 controls the power switch KA to close so that the first power supply terminal and the second power supply terminal are powered on. For example, as Figure 1As shown in the figure, the power switch KA1 on the side of the discharging vehicle is powered on and closed, enabling the storage battery 04 to supply power to the first power supply terminal and the second power supply terminal. At this time, the power switch KA2 on the side of the charging vehicle may not operate. After the first power supply terminal is powered on, the first switch unit S01 is closed, and the mechanical structure of the first electronic lock module 5 locks the second switch S2, keeping the second switch S2 in a closed state and unable to be disconnected, that is, maintaining the full connection of the charging and discharging connection device 10 with the discharging vehicle 20. Also, after the second power supply terminal is powered on, the second switch unit S02 is closed to keep the third switch S3 in a closed state. The mechanical structure of the second electronic lock module 6 locks the third switch S3, keeping the third switch S3 in a closed state and unable to be disconnected, that is, maintaining the full connection of the charging and discharging connection device 10 with the charging vehicle 300. Thus, the charging and discharging connection device 10 is in a fully connected state with both the discharging vehicle 20 and the charging vehicle 30. Moreover, only when both electronic lock modules are powered on, that is, in the locked state, can the charging and discharging be started, avoiding charging and discharging when not properly connected and improving safety.

[0068] Among them, a power switch KA2 can also be set in the charging vehicle 30. When the charging vehicle 30 acts as a discharging vehicle, the power switch KA2 can be controlled to supply power to the A+ connection line and the A- connection line, and at this time, the power switch KA1 may not operate.

[0069] In some other embodiments, as Figure 3 shown, the charging and discharging connection device 10 includes a first electronic lock module 5. The first electronic lock module 5 includes a first power supply terminal and a first switch unit S01. The first power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the charging vehicle 30. The first end of the first switch unit S01 is connected to the second end of the sixth resistor R6, and the second end of the first switch unit S01 is connected to the third charge and discharge detection point 3. The charging and discharging connection device 10 further includes a second electronic lock module 6. The second electronic lock module 6 includes a second power supply terminal and a second switch unit S02. The second power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the discharging vehicle 20. The first end of the second switch unit S02 is connected to the second end of the third resistor R3, and the second end of the second switch unit S3 is connected to the second charge and discharge detection point 2. The charging and discharging connection device 10 further includes an eighth resistor R8 and a ninth resistor R9. The eighth resistor R8 is connected in parallel with the first switch unit S01, and the ninth resistor R9 is connected in parallel with the second switch unit S02. The discharging vehicle 20 includes a power switch KA1, and the power switch KA1 is connected to the storage battery 04 and the A+ connection terminal of the discharging vehicle 20, or the power switch KA1 is connected to the storage battery 04 and the A- connection terminal of the discharging vehicle 20.

[0070] The first electronic lock module 5 is used to lock the third switch S3 when the charging and discharging connection device 10 is fully connected to the charging vehicle 30, so that the third switch S3 maintains a closed state. The second electronic lock module 6 is used to lock the second switch S2 when the charging and discharging connection device 10 is fully connected to the discharging vehicle 20, so that the second switch S2 maintains a closed state and cannot be operated.

[0071] Specifically, based on the above connection state recognition process, it is determined that the charging and discharging connection device 10 is in a fully connected state with both the discharging vehicle 20 and the charging vehicle 30; the discharging vehicle 20 controls the power switch KA1 to close to power on the first power terminal and the second power terminal. For example, as Figure 3 shown, when the power switch KA1 on the discharging vehicle side is closed, the battery 04 supplies power to the A+ connection line and the A- connection line, so that the first power terminal is powered on. At this time, the first switch unit S01 is closed, and the mechanical structure of the first electronic lock module 5 locks the third switch S3, so that the third switch S3 cannot be operated, so as to keep the third switch S3 in a closed state, that is, to keep the charging and discharging connection device 10 in a fully connected state with the charging vehicle 30; and, when the second power is powered on, the second switch unit S02 is closed, and the mechanical structure of the second electronic lock module 6 locks the second switch S2, so that the second switch S2 cannot be operated, so as to keep the second switch S3 in a closed state, that is, to keep the charging and discharging connection device 10 in a fully connected state with the discharging vehicle 30. And, only when both electronic lock modules are powered on, that is, in a locked state, can charging and discharging be started, avoiding charging and discharging when not connected properly, and improving safety.

[0072] For Figure 3 the control and guidance circuit shown, it is also possible to determine the connection state of the charging and discharging connection device 10 with the charging vehicle and the discharging vehicle according to the preset voltage range in which the second actual voltage of the second charging and discharging detection point 2 falls, and, in combination with the preset voltage range in which the third actual voltage of the third charging and discharging detection point 3 falls, the charging vehicle determines the unconnected state and the semi-connected state of the charging and discharging connection device 10 with the charging vehicle 30. The specific process is the same as the recognition process based on Figure 1 the circuit. Only because the connection relationship of the electronic locking module is different, therefore, in different connection states, the preset voltage ranges corresponding to the second charging and discharging detection point 2 and the third charging and discharging detection point 3 are different, and the preset voltage ranges stored can be adjusted based on the specific circuit structure.

[0073] Next, taking Figure 3 the control and guidance circuit shown as an example, the connection state of the charging and discharging connection device with the discharging vehicle and the charging vehicle is identified according to the actual voltages of the second charging and discharging detection point 2 and the third charging and discharging detection point 3 will be described.

[0074] For example, if the second actual voltage of the second charge and discharge detection point 2 is U2 and the third actual voltage of the third charge and discharge detection point 3 is U3, then neither the first plug 1 nor the second plug 2 is inserted into the vehicle socket, and they are in an unconnected state.

[0075] For another example, if the second actual voltage of the second charge and discharge detection point 2 is (R4 + R9) / (R4 + R9 + R2)*U2 and the third actual voltage of the third charge and discharge detection point 3 is (R6 + R8) / (R6 + R8 + R7)*U3, then the first plug 1 is inserted into the discharging vehicle and the second plug 2 is inserted into the receiving vehicle, and they are both in a fully connected state, and the first electronic locking module 5 and the second electronic locking module 6 are in an unlocked state.

[0076] For another example, if the second actual voltage of the second charge and discharge detection point 2 is R4 / (R4 + R2)*U2 and the third actual voltage of the third charge and discharge detection point 3 is R6 / (R6 + R7)*U3, then the first plug 1 is inserted into the discharging vehicle and the second plug 2 is inserted into the charging vehicle, and they are both in a fully connected state, and the first electronic locking module 5 and the second electronic locking module 6 are in a locked state.

[0077] For another example, if the second actual voltage of the second charge and discharge detection point 2 is (R4 + R3 + R9) / (R4 + R3 + R9 + R2)*U2 and the third actual voltage of the third charge and discharge detection point 3 is (R6 + R8) / (R6 + R8 + R7)*U3, then the first plug 1 is inserted into the discharging vehicle and the second plug 2 is inserted into the charging vehicle, and they are both in a semi-connected state.

[0078] For another example, if the second actual voltage of the second charge and discharge detection point 2 is ((((R4 + R3)*R5) / (R4 + R3 + R5)) + R9) / ((((R4 + R3)*R5) / (R4 + R3 + R5)) + R9 + R2)*U2 and the third actual voltage of the third charge and discharge detection point 3 is (R6 + R8 / (R6 + R8 + R7))*U3, then the first plug 1 is inserted into the discharging vehicle and the second plug 2 is inserted into the charging vehicle, and only the discharging vehicle is in a semi-connected state.

[0079] For another example, if the second actual voltage of the second charge and discharge detection point 2 is (R4 + R9) / (R4 + R9 + R2)*U2 and the third actual voltage of the third charge and discharge detection point 3 is (R6 + R8 / (R6 + R8 + R7))*U3, then the first plug 1 is inserted into the discharging vehicle and the second plug 2 is inserted into the charging vehicle, and only the charging vehicle is in a semi-connected state.

[0080] Thus, for Figure 3 the control and guidance circuit shown, the connection states of the charge and discharge connection device 10 with the discharging vehicle 20 and the charging vehicle 30 can also be identified according to the voltages of the second charge and discharge detection point 2 and the third charge and discharge detection point 3.

[0081] Above, the V2V charge and discharge control guidance method according to the embodiments of the present invention describes identifying the capacity of the connection harness based on the harness identification resistor R0 of the harness control guidance circuit by detecting the first charge and discharge detection point 1, and determining the connection states of the charge and discharge connection device 10 with the charging vehicle and the discharging vehicle by the voltage changes at the second charge and discharge detection point 2 and the third charge and discharge detection point 3.

[0082] Among them, in the embodiments of the present invention, identifying the capacity of the connection harness and identifying the connection states of the charge and discharge connection device with the discharging vehicle and the charging vehicle can be carried out simultaneously, or, identifying the connection states of the charge and discharge connection device with the discharging vehicle and the charging vehicle after identifying the capacity of the connection harness, or, identifying the capacity of the connection harness after identifying the connection states of the charge and discharge connection device with the discharging vehicle and the charging vehicle. Among them, the connection states include any one of the fully connected state, the semi-connected state, and the unconnected state. In short, the order of identifying the harness capacity and identifying the connection state is not specifically limited. However, the electronic lock locking control needs to be carried out after the state identification is completed to ensure the safety of charge and discharge.

[0083] Specifically, during the entire charge and discharge process, the discharging vehicle side monitors the states of the power switch KA1 and the power switch KA2. The conditions for the discharging vehicle to allow discharging are: both the charging and discharging vehicle and the charge and discharge connection device 10 are fully connected, and the electronic lock module is fully locked.

[0084] During the charge and discharge connection process, the harness capacity identification and the connection state identification are carried out. On the discharging vehicle side, it is determined by the voltage at the second charge and discharge detection point 2 that the plugs of the charge and discharge connection device 10 are in a fully connected state with the sockets of the discharging vehicle and the charging vehicle. Only when the user activates the DC discharging function on the discharging vehicle side and the discharging vehicle side controls the first switch K1 to close can the whole vehicle enter the discharging process. The discharging vehicle controls the low-voltage power supply device to supply power, for example, controls the power switch KA1 to close, to supply power to the electronic lock module. When the electronic lock module is powered on, the first switch unit S01 and the second switch unit S02 are closed. The mechanical structure of the electronic lock module keeps the second switch S2 and the third switch S3 closed and unable to be disconnected. At the same time, the electronic lock module is linked with the CAN line, that is, the S+ line and the S- line. When the switch unit of the electronic lock module is closed, the CAN loop is conducted, and the discharging vehicle and the charging vehicle can communicate.

[0085] Among them, in the embodiment, the discharging vehicle can also set the start discharging function before connecting to the charging and discharging connection device. After the setting is completed, the first switch K1 is controlled to close. If the discharging vehicle does not detect the connection of the charging and discharging connection device, it will not control the power switch KA1 to close, and can continuously detect the state of the vehicle plug. If it detects that the charging and discharging connection device is fully connected to both the discharging vehicle and the charging vehicle within a certain period of time, it will enter the discharging process and control the electronic lock to lock; if it still detects the vehicle plug connection or incomplete connection after exceeding a certain time, the discharging vehicle will exit the discharging process and control the first switch K1 to disconnect. If it is necessary to start discharging, the discharging function must be enabled again on the discharging vehicle.

[0086] In the embodiment, the conditions for exiting the discharging process in normal charging and discharging situations may include: when reaching the discharging stop condition, such as reaching the set discharging power of the discharging vehicle or the charging vehicle is fully charged, the discharging vehicle or the charging vehicle terminates discharging through CAN line communication. After the discharging process interaction is completed, when the current on DC+ / DC- of the discharging vehicle drops to a preset current, such as below 5A, the power switch is controlled to disconnect. After the electronic lock loses power, its switch unit disconnects. At this time, the mechanical buttons of the discharging plug and the charging plug of the charging and discharging connection device can be pressed to unplug the charging and discharging plugs from the vehicle socket.

[0087] Abnormal situations may also occur during the charging and discharging process. To ensure the safety of charging and discharging, the discharging process can be exited in case of abnormal situations. For example, if an abnormality occurs during discharging, such as detecting abnormal connection of the charging and discharging connection device, that is, the voltage at the second charging and discharging detection point 2 is the voltage value of the incomplete connection state, or communication interruption, that is, the CAN line is disconnected, the discharging vehicle will interrupt discharging. When the current on DC+ / DC- drops to a certain value, such as below 5A, the switches K5 / K6 on the power supply lines DC+ and DC- are disconnected, and then the low-voltage power supply switch KA1 is controlled to unlock the electronic lock after the electronic lock loses power, and the plugs of the charging and discharging connection device can be unplugged from the vehicle socket.

[0088] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0089] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A V2V charge and discharge control guidance method, characterized in that, Applied to a discharging vehicle, the discharging vehicle is connected to an external charging and discharging connection device. A socket resistor is provided in the socket of the discharging vehicle. The first end of the socket resistor is connected to the vehicle body ground. A discharging vehicle control and guidance circuit is provided in the discharging vehicle. The charging and discharging connection device includes a connection wire harness and a wire harness control and guidance circuit. The wire harness control and guidance circuit includes a wire harness capacity identification resistor. The first end of the wire harness capacity identification resistor is connected to the vehicle body ground. The discharging vehicle control and guidance circuit includes a first resistor. The first end of the first resistor is connected to a first power supply. The second end of the first resistor is connected to the second end of the wire harness capacity identification resistor and the second end of the socket resistor. The second end of the first resistor is configured as a first charging and discharging detection point. The V2V charging and discharging control and guidance method includes: Obtain the first actual voltage of the first charge and discharge detection point, where the first actual voltage is obtained by calculation, where R11 is the resistance value of the socket resistor, R0 is the resistance value of the wire harness capacity identification resistor, R1 is the resistance value of the first resistor, and U1 is the voltage value of the first power supply; Determine the first target preset voltage range in which the first actual voltage falls; Determine the wire harness capacity of the connection wire harness according to the first target preset voltage range.

2. The V2V charge and discharge control guidance method according to claim 1, wherein Determining the wire harness capacity of the connection wire harness according to the first target preset voltage range includes: When the first target preset voltage range is a first voltage range, determine the wire harness capacity of the connection wire harness as a first capacity; Or, when the first target preset voltage range is a second voltage range, determine the wire harness capacity of the connection wire harness as a second capacity, where the voltage value of the second voltage range is less than the voltage value of the first voltage range, and the second capacity is greater than the first capacity; Or, when the first target preset voltage range is a third voltage range, determine the wire harness capacity of the connection wire harness as a third capacity, where the voltage value of the third voltage range is less than the voltage value of the second voltage range, and the third capacity is greater than the second capacity.

3. The V2V charge and discharge control and guidance method according to claim 1, characterized in that, The connection wire harness includes a DC+ wire and a DC- wire. Determining the wire harness capacity of the connection wire harness according to the first target preset voltage range includes: Determine the wire harness capacity of at least one of the DC+ wire and the DC- wire according to the first target preset voltage range.

4. The V2V charge and discharge control and guidance method according to claim 1, wherein The discharging vehicle control and guidance circuit further includes a first switch. The first end of the first switch is connected to the second end of the first resistor. The second end of the first switch is connected to the second end of the wire harness capacity identification resistor; The V2V control and guidance method further includes: in response to a charging and discharging control instruction, control the first switch to close to obtain the voltage at the first charging and discharging detection point.

5. The V2V charging and discharging control and guidance method according to claim 1, wherein The charging and discharging connection device is further connected to a charging vehicle. The charging vehicle includes a charging vehicle control and guidance circuit. The charging vehicle control and guidance circuit includes a fifth resistor. The first end of the fifth resistor is connected to the vehicle body ground; The discharging vehicle control and guidance circuit includes a second resistor. The first end of the second resistor is connected to a second power supply; The wire harness control and guidance circuit further includes a third resistor, a fourth resistor, and a second switch. A first end of the second switch in parallel with the third resistor is connected to the vehicle body ground. A second end of the second switch in parallel with the third resistor is connected to a first end of the fourth resistor. A second end of the fourth resistor is connected to a second end of the second resistor. The second end of the second resistor is configured as a second charge and discharge detection point; The wire harness control and guidance circuit further includes a third switch. A first end of the third switch is connected to a second end of the fifth resistor. A second end of the third switch is connected to the second charge and discharge detection point; The V2V control and guidance method further includes: Obtaining a second actual voltage of the second charge and discharge detection point; Determining a second target preset voltage range in which the second actual voltage falls; Determining a connection state of the charge and discharge connection device with the discharging vehicle and the charging vehicle according to the second target preset voltage range.

6. The V2V charge and discharge control guidance method according to claim 5, wherein Determining a connection state of the charge and discharge connection device with the discharging vehicle and the charging vehicle according to the second target preset voltage range includes: When the second target preset voltage range is a fourth voltage range, determining that the charge and discharge connection device is in a semi-connected state with the discharging vehicle, and the charge and discharge connection device is in a non-connected state or a semi-connected state with the charging vehicle; Or, when the second target preset voltage range is a fifth voltage range, determining that the charge and discharge connection device is in a fully connected state with the discharging vehicle, and the charge and discharge connection device is in a non-connected state or a semi-connected state with the charging vehicle, wherein a voltage value of the fifth voltage range is less than a voltage value of the fourth voltage range; Or, when the second target preset voltage range is a sixth voltage range, determining that the charge and discharge connection device is in a semi-connected state with the discharging vehicle, and the charge and discharge connection device is in a fully connected state with the charging vehicle, wherein a voltage value of the sixth voltage range is greater than a voltage value of the fifth voltage range; Or, when the second target preset voltage range is a seventh voltage range, determining that the charge and discharge connection device is in a fully connected state with the discharging vehicle, and the charge and discharge connection device is in a fully connected state with the charging vehicle, wherein a voltage value of the seventh voltage range is less than a voltage value of the fifth voltage range.

7. The V2V charge and discharge control and guidance method according to claim 6, wherein Before determining the wire harness capacity of the connection wire harness according to the first target preset voltage range, the method further includes: Determining that the charge and discharge connection device is in a fully connected state with the discharging vehicle according to the second target preset voltage range.

8. The V2V charge and discharge control and guidance method according to claim 6, wherein The charge and discharge connection device further includes a first electronic lock module. The first electronic lock module includes a first power supply end and a first switch unit. The first power supply end is connected to the A+ connection terminal and the A- connection terminal of the charging vehicle; The charge and discharge connection device further includes a second electronic lock module, the second electronic lock module includes a second power supply terminal and a second switch unit, the second power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the discharging vehicle, and the first switch unit and the second switch unit are connected in series between the S+ connection terminal of the discharging vehicle and the S+ connection terminal of the charging vehicle; The discharging vehicle includes a power switch, the power switch is connected to the battery of the discharging vehicle and the A+ connection terminal, or the power switch is connected to the battery of the discharging vehicle and the A- connection terminal; The V2V charge and discharge control and guidance method further includes: Determine that the charge and discharge connection device is in a fully connected state with the discharging vehicle and the charging vehicle; The discharging vehicle controls the power switch to close so that the first power supply terminal and the second power supply terminal are powered on; Control the first switch unit to close to keep the third switch closed, and control the second switch unit to close to keep the second switch closed.

9. The V2V charge and discharge control and guidance method according to claim 6, wherein, The wire harness control and guidance circuit further includes a sixth resistor, and the first end of the sixth resistor is connected to the body ground; The charging vehicle control and guidance circuit further includes a seventh resistor, the first end of the seventh resistor is connected to a third power supply, the second end of the seventh resistor is connected to the second end of the sixth resistor, and the second end of the seventh resistor is configured as a third charge and discharge detection point; The charge and discharge connection device further includes a first electronic lock module, the first electronic lock module includes a first power supply terminal and a first switch unit, the first power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the charging vehicle, the first end of the first switch unit is connected to the second end of the sixth resistor, and the second end of the first switch unit is connected to the third charge and discharge detection point; The charge and discharge connection device further includes a second electronic lock module, the second electronic lock module includes a second power supply terminal and a second switch unit, the second power supply terminal is connected to the A+ connection terminal and the A- connection terminal of the discharging vehicle, the first end of the second switch unit is connected to the second end of the third resistor, and the second end of the second switch unit is connected to the second charge and discharge detection point; The charge and discharge connection device further includes an eighth resistor and a ninth resistor, the eighth resistor is connected in parallel with the first switch unit, and the ninth resistor is connected in parallel with the second switch unit; The discharging vehicle includes a power switch, the power switch is connected to the battery of the discharging vehicle and the A+ connection terminal, or the power switch is connected to the battery of the discharging vehicle and the A- connection terminal; The V2V charge and discharge control and guidance method further includes: Determine that the charge and discharge connection device is in a fully connected state with the discharging vehicle and the charging vehicle; The discharging vehicle controls the power switch to close so that both the first power supply terminal and the second power supply terminal are powered on; Control the first switch unit to close to keep the third switch in the closed state, and control the second switch unit to close to keep the second switch in the closed state.

10. The V2V charge and discharge control and guidance method according to any one of claims 1-9, characterized in that identifying the capacity of the connection harness and identifying the connection states of the charge and discharge connection device with the discharging vehicle and the charging vehicle are carried out simultaneously; alternatively, identifying the connection states of the charge and discharge connection device with the discharging vehicle and the charging vehicle after identifying the capacity of the connection harness; alternatively, identifying the capacity of the connection harness after identifying the connection states of the charge and discharge connection device with the discharging vehicle and the charging vehicle; wherein, the connection state includes any one of a fully connected state, a semi-connected state, and a non-connected state.

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