Vehicle-mounted integrated external discharge control system and method

Abstract

The invention discloses a vehicle-mounted integrated external discharge control system and method. The system comprises a vehicle-mounted charger, a charge and discharge control box, a charge and discharge interface and an AC discharge interface. The vehicle-mounted charger is in signal connection with the charging and discharging control box and the power battery. The vehicle-mounted charger is in signal connection with the CC terminal and the CP terminal of the charging and discharging interface. And the charging and discharging control box is used for controlling the on-off of the electric connection between the vehicle-mounted charger and the charging and discharging interface and the AC discharging interface. When the charging and discharging control box conducts electric connection between the vehicle-mounted charger and the AC discharging interface, the AC discharging interface provides AC power for the outside. And when the charging and discharging control box conducts the electric connection between the vehicle-mounted charger and the charging and discharging interface, the vehicle-mounted charger judges the connection port of the charging and discharging interface for external discharging or internal charging according to the CC resistance signal. According to the invention, various discharge modes can be realized, the use of a user is facilitated on the basis of safe discharge, and the convenience and the safety can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile charging and discharging control, and more specifically, to a vehicle-mounted integrated external discharge control system and method. Background Art

[0002] With the improvement of environmental awareness and the continuous development of technology, the market share of electric vehicles will continue to grow. As one of the core functions of electric vehicles, the discharge function has more and more usage scenarios. The technical principles and control theories of discharge are constantly developing and may be applied to more fields in the future. Such as camping and outdoor activities, emergency rescue, family and outdoor work, travel and mobile office, etc. For electric commercial vehicles, it can also be used in the field of upper installation, such as modified air-conditioned refrigerated trucks, garbage trucks, advertising vehicles, etc. In short, with the continuous development and popularization of electric vehicle technology, the discharge function will have a wider range of application scenarios. Existing vehicles have the following disadvantages when discharging externally: ① The external discharge function cannot be used when the vehicle is driving or charging, and the external discharge function cannot be used when fast charging or slow charging. ② The power is relatively small, and it cannot even meet the full power charging requirements of mobile phones. The interface is easy to heat up during discharge. At the same time, the inverter is generally placed in the cab, which is not only noisy, but also has safety hazards. ③ The user needs to add an inverter controller, which is additionally installed and fixed, and it is generally an air-cooled controller, which will have a relatively large noise and unstable power output. Therefore, how to conveniently and safely control the external discharge of the vehicle is of great significance. Summary of the invention

[0003] The present invention provides a vehicle-mounted integrated external discharge control system and method, which solves the inconvenience of existing electric vehicle charging and discharging, can realize multiple discharge modes, is convenient for users to use on the basis of safe discharge, and can improve convenience and safety.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] An on-board integrated external discharge control system, comprising: an on-board charger, a charge and discharge control box, a charge and discharge interface and an AC discharge interface;

[0006] The on-board charger is respectively connected to the charge and discharge control box and the power battery by signal, and the on-board charger is connected to the CC terminal and the CP terminal of the charge and discharge interface by signal;

[0007] The charge and discharge control box is electrically connected to the L terminal, N terminal and PE terminal corresponding to the charge and discharge interface and the AC discharge interface respectively, and the charge and discharge control box is used to control the on-board charger and the charge and discharge interface and the AC discharge interface.

[0008] When the charge and discharge control box conducts the electrical connection between the on-board charger and the AC discharge interface, the AC discharge interface provides AC power to the outside;

[0009] When the charge and discharge control box conducts the electrical connection between the on-board charger and the charge and discharge interface, the on-board charger determines whether the charge and discharge interface is used as a connection port for external discharge or internal charging according to the CC resistance signal.

[0010] Preferably, the L connection terminals corresponding to the charging and discharging interface and the AC discharging interface include: an L1 connection contact, an L2 connection contact and an L3 connection contact, so as to selectively perform single-phase or three-phase electrical connection.

[0011] Preferably, the charge and discharge control box is provided with two groups of L1 connection lines, L2 connection lines, L3 connection lines, N connection lines and PE connection lines to connect with corresponding wiring contacts of the charge and discharge interface and the AC discharge interface.

[0012] Preferably, the charge and discharge control box comprises: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay;

[0013] The first relay, the second relay, the third relay and the fourth relay are respectively arranged on the corresponding L1 connection line, L2 connection line, L3 connection line and N connection line between the charging and discharging interface and the on-board charger;

[0014] The fifth relay, the sixth relay, the seventh relay and the eighth relay are respectively arranged on the corresponding L1 connection line, L2 connection line, L3 connection line and N connection line between the AC discharge interface and the vehicle charger.

[0015] Preferably, it also includes: a vehicle controller;

[0016] The vehicle controller is respectively connected to the control end signals of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, the seventh relay and the eighth relay to control the opening or closing of the corresponding relays.

[0017] Preferably, it further comprises: a first thermistor and a second thermistor;

[0018] The first thermistor is arranged at the relay of the corresponding charging and discharging interface in the charging and discharging control box, and the second thermistor is arranged at the relay of the corresponding AC discharging interface in the charging and discharging control box;

[0019] The vehicle controller is respectively connected to the first thermistor and the second thermistor signals, and controls the corresponding relay to disconnect when it is detected that the temperature is greater than a set threshold.

[0020] Preferably, it also includes: a third thermistor;

[0021] The third thermistor is arranged at the AC discharge interface, the vehicle controller is connected to the third thermistor signal, and is used to control the corresponding relay to disconnect when it is used to detect that the temperature generated by the AC discharge interface when discharging to the outside is greater than a set threshold.

[0022] The present invention also provides a vehicle-mounted integrated external discharge control method, using the above control system, comprising:

[0023] When the charging gun is inserted into the charging and discharging interface, the on-board charger automatically recognizes that charging is in progress by identifying the effective values ​​of the CP and CC signals, and transmits the charging signal to the vehicle controller through the CAN bus. The vehicle controller controls the first relay, the second relay, the third relay, and the fourth relay corresponding to the charging and discharging interface to be attracted, so that the vehicle enters charging;

[0024] When the external discharge gun is inserted into the charge and discharge interface, the on-board charger recognizes it as a discharge resistor through the CC resistance signal. When it automatically recognizes external discharge, the external discharge signal is transmitted to the vehicle controller through the CAN bus. The vehicle controller controls the first relay, the second relay, the third relay, and the fourth relay corresponding to the charge and discharge interface to be attracted, so that the vehicle enters external discharge.

[0025] Preferably, it also includes:

[0026] A discharge button is provided, and the discharge button is connected to the vehicle controller signal. When the discharge button is pressed, the vehicle controller controls the conduction or disconnection of the fifth relay, the sixth relay, the seventh relay and the eighth relay to control the AC discharge interface to discharge or stop discharging externally.

[0027] Preferably, it also includes:

[0028] When the charging and discharging interface is discharging, if the user wants to draw power through the AC discharging interface, the discharge button triggers the corresponding relay to close, so that the two interfaces of the vehicle can be discharged at the same time;

[0029] When the user draws power through the AC discharge interface and the discharge gun and charging gun are not inserted into the charge and discharge interface, the corresponding relay is triggered by the discharge button to close, and the first relay, the second relay, the third relay, and the fourth relay corresponding to the charge and discharge interface are controlled by the vehicle controller to be in a disconnected state to prevent false triggering and closure. If it is detected that the relay corresponding to the charge and discharge interface is abnormally closed, the AC discharge interface is actively stopped from discharging to the outside, and a fault is reported.

[0030] The present invention provides a vehicle-mounted integrated external discharge control system and method, wherein the vehicle-mounted charger is electrically connected to the charge and discharge interface and the AC discharge interface respectively through a charge and discharge control box, and then the charge and discharge control box controls the on and off of the electrical connection to realize external discharge of the entire vehicle, thereby solving the inconvenience problem of existing electric vehicle charging and discharging, realizing multiple discharge modes, facilitating user use on the basis of safe discharge, and improving convenience and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0032] Figure 1 It is a schematic diagram of a vehicle-mounted integrated external discharge control system provided by the present invention. DETAILED DESCRIPTION

[0033] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0034] In view of the inconvenience in charging and discharging of current electric vehicles, the present invention provides a vehicle-mounted integrated external discharge control system and method to solve the inconvenience in charging and discharging of existing electric vehicles, realize multiple discharge modes, facilitate user use on the basis of safe discharge, and improve convenience and safety.

[0035] like Figure 1As shown, a vehicle-mounted integrated external discharge control system includes: an on-board charger, a charge and discharge control box, a charge and discharge interface, and an AC discharge interface. The on-board charger is respectively connected to the charge and discharge control box and the power battery signal, and the on-board charger is signal-connected to the CC terminal and the CP terminal of the charge and discharge interface. The charge and discharge control box is electrically connected to the L terminal, N terminal, and PE terminal corresponding to the charge and discharge interface and the AC discharge interface, respectively, and the charge and discharge control box is used to control the on-board charger and the charge and discharge interface and the AC discharge interface. When the charge and discharge control box conducts the electrical connection between the on-board charger and the AC discharge interface, the AC discharge interface provides AC power to the outside. When the charge and discharge control box conducts the electrical connection between the on-board charger and the charge and discharge interface, the on-board charger determines the connection port of the charge and discharge interface for external discharge or internal charging according to the CC resistance signal.

[0036] Specifically, the charging and discharging interface is a standard vehicle charging port, which is connected to the on-board charger through the charging and discharging control box. The charging and discharging interface can be inserted into the charging gun and the discharging gun to realize charging or external discharge of the power battery. The AC discharge interface can be a conventional electrical port such as a plug strip, a socket, etc., which is connected to the on-board charger through the charging and discharging control box, and the on-board charger discharges externally through the AC discharge interface. The system can realize a variety of discharge methods, which is convenient for users to use on the basis of safe discharge, and can improve convenience and safety.

[0037] Furthermore, the L connection terminals corresponding to the charging and discharging interface and the AC discharging interface include: an L1 connection contact, an L2 connection contact and an L3 connection contact, so as to selectively perform single-phase or three-phase electrical connection.

[0038] Furthermore, the charge and discharge control box is provided with two groups of L1 connection lines, L2 connection lines, L3 connection lines, N connection lines and PE connection lines to connect with corresponding wiring contacts of the charge and discharge interface and the AC discharge interface.

[0039] Furthermore, the charge and discharge control box includes: a first relay KM01, a second relay KM02, a third relay KM03, a fourth relay KM04, a fifth relay KM05, a sixth relay KM06, a seventh relay KM07 and an eighth relay KM08.

[0040] The first relay KM01, the second relay KM02, the third relay KM03 and the fourth relay KM04 are respectively arranged on the corresponding L1 connection line, L2 connection line, L3 connection line and N connection line between the charging and discharging interface and the on-board charger.

[0041] The fifth relay KM05, the sixth relay KM06, the seventh relay KM07 and the eighth relay KM08 are respectively arranged on the corresponding L1 connection line, L2 connection line, L3 connection line and N connection line between the AC discharge interface and the vehicle charger.

[0042] In actual applications, the on-board charger is connected to power supply, CAN communication, charging interface signal detection, etc. When the vehicle only needs to be charged, the charging gun is inserted into the charging and discharging interface. The on-board charger automatically determines that it is charging by identifying the effective value of the CP and CC signals, and transmits the charging signal to the vehicle through the CAN signal. The vehicle controls the KM01-KM04 relay to energize, and the vehicle starts charging. Figure 1 As shown, when the on-board charger is a three-phase power supply, L2 and L3 are connected normally. When the on-board charger only supports single-phase charging, L2 and L3 can be disconnected. When the AC discharge interface is used, when the on-board charger supports three-phase external discharge, L2-1 and L3-1 can be connected normally, and users can use both three-phase and single-phase electricity; when the on-board charger only supports single-phase external discharge, L2-1 and L3-1 can be disconnected. When the vehicle needs external discharge for charging, KM01-KM08 can be controlled to be attracted at the same time. When the on-board charger detects that the CC at the discharge interface is a discharge resistor, KM01-KM04 can be automatically controlled to be attracted. Of course, the attraction relay can also be controlled by a switch; when charging, if external discharge is required, the KM05-KM08 relay can be controlled to be attracted, and the load can directly use the energy of the external power supply without the energy of the vehicle.

[0043] The system also includes: a vehicle controller; the vehicle controller is respectively connected to the control end signals of the first relay KM01, the second relay KM02, the third relay KM03, the fourth relay KM04, the fifth relay KM05, the sixth relay KM06, the seventh relay KM07 and the eighth relay KM08 to control the opening or closing of the corresponding relays.

[0044] In actual application, when the vehicle needs to be discharged externally, the KM01-KM04 relays are controlled to be disconnected and the KM05-KM08 relays are controlled to be closed. When the vehicle is charged and discharged externally, the KM01-KM08 relays are controlled to be energized at the same time. When the vehicle only needs to be charged, the KM01-KM04 relays are controlled to be energized and the KM05-KM08 relays are controlled to be disconnected. When the vehicle is not charged and does not need to be discharged externally, the KM01-KM08 relays can be controlled to be disconnected at the same time.

[0045] The system also includes: a first thermistor T1 and a second thermistor T2; the first thermistor T1 is arranged at the relay of the corresponding charge and discharge interface in the charge and discharge control box, and the second thermistor T2 is arranged at the relay of the corresponding AC discharge interface in the charge and discharge control box; the vehicle controller is respectively connected to the signals of the first thermistor T1 and the second thermistor T2, and controls the corresponding relay to disconnect when it is detected that the temperature is greater than the set threshold.

[0046] The system also includes: a third thermistor T3; the third thermistor T3 is arranged at the AC discharge interface, the vehicle controller is connected to the third thermistor T3 signal, and is used to control the corresponding relay to disconnect when detecting that the temperature generated by the AC discharge interface when discharging to the outside is greater than a set threshold.

[0047] It can be seen that the present invention provides a vehicle-mounted integrated external discharge control system, in which the vehicle-mounted charger is electrically connected to the charge and discharge interface and the AC discharge interface respectively through the charge and discharge control box, and then the charge and discharge control box controls the on and off of the electrical connection to realize external discharge of the entire vehicle, thereby solving the inconvenience problem of existing electric vehicle charging and discharging, realizing multiple discharge modes, facilitating user use on the basis of safe discharge, and improving convenience and safety.

[0048] Accordingly, the present invention also provides a vehicle-mounted integrated external discharge control method, using the above control system, comprising:

[0049] When the charging gun is inserted into the charging and discharging interface, the on-board charger automatically recognizes that charging is in progress by identifying the effective values ​​of the CP and CC signals, and transmits the charging signal to the vehicle controller through the CAN bus. The vehicle controller controls the first relay, the second relay, the third relay, and the fourth relay corresponding to the charging and discharging interface to be attracted, so that the vehicle enters charging;

[0050] When the external discharge gun is inserted into the charge and discharge interface, the on-board charger recognizes it as a discharge resistor through the CC resistance signal. When it automatically recognizes external discharge, the external discharge signal is transmitted to the vehicle controller through the CAN bus. The vehicle controller controls the first relay, the second relay, the third relay, and the fourth relay corresponding to the charge and discharge interface to be attracted, so that the vehicle enters external discharge.

[0051] The method also includes: setting a discharge button, the discharge button is connected to the vehicle controller signal, and the vehicle controller controls the conduction or disconnection of the fifth relay, the sixth relay, the seventh relay and the eighth relay when the discharge button is pressed to control the AC discharge interface to discharge or stop discharging externally.

[0052] The method further includes: when the charging and discharging interface is discharging, if the user wants to draw power through the AC discharging interface, triggering the corresponding relay to be attracted by the discharging button to achieve simultaneous discharge of the two interfaces of the vehicle;

[0053] When the user draws power through the AC discharge interface and the discharge gun and charging gun are not inserted into the charge and discharge interface, the corresponding relay is triggered by the discharge button to close, and the first relay, the second relay, the third relay, and the fourth relay corresponding to the charge and discharge interface are controlled by the vehicle controller to be in a disconnected state to prevent false triggering and closure. If it is detected that the relay corresponding to the charge and discharge interface is abnormally closed, the AC discharge interface is actively stopped from discharging to the outside, and a fault is reported.

[0054] In practical applications, the discharge button can be made into a physical button or an MP5 soft switch. When the charge and discharge interface is in the charging state, if the user wants to use the external discharge function of the AC discharge interface, the discharge button can be used to trigger the KM05-KM08 relay to pull in. The pull-in sequence is that after the vehicle determines that it is pulled in, it sends the discharge demand to the on-board charger, and the charger outputs external discharge. The user can use power from the AC discharge interface to achieve the situation where the vehicle is charging while using external discharge. When the external discharge of the AC discharge interface is not used, the KM05-KM08 relay can also be triggered to disconnect by pressing a button. The disconnection sequence is that the on-board charger detects the disconnection signal and stops the external discharge first. After the external discharge stops, the vehicle controls the relay to disconnect to ensure the safety of the discharge interface.

[0055] When the charging and discharging interface is plugged into a charging gun, the on-board charger detects the charging gun signal, and the charger informs the vehicle controller of the charging signal and controls the KM01-KM04 relay to close. After KM01-KM04 is closed, the vehicle controller determines the power of the AC discharge interface load and the maximum input power of the charging and discharging interface. When the charging and discharging interface is greater than the AC discharge interface, the AC discharge interface can directly use the energy of the charging and discharging interface. At the same time, the on-board charger can charge the vehicle with a certain power to replenish energy, realizing the working condition of charging and discharging at the same time. When the charging and discharging interface is equal to the power of the AC discharge interface, the on-board charger can realize a 0A closed loop and no longer consume the energy of the battery. If the user draws power through the charging and discharging interface and inserts a discharge gun into the charging and discharging interface, the on-board charger recognizes the discharge gun signal, and the on-board charger informs the vehicle of the discharge signal, controls the KM01-KM04 relay to close, and realizes the simultaneous discharge of the charging and discharging interface and the AC discharge interface.

[0056] When the vehicle is fast-charged, because the DC power that is fast-charged to the vehicle is directly charged to the battery, it does not pass through the on-board charger or the charge and discharge control box. The corresponding relays of the charge and discharge interface and the AC discharge interface can be controlled to close and disconnect to meet the needs of external discharge and power collection. When the vehicle is driving, the charge and discharge interface should generally not be energized. In order to prevent the occurrence of abnormal energization, the charge and discharge interface is inserted into the discharge gun or charging gun. However, if the vehicle is in driving, the vehicle will control the KM01-KM04 relays to disconnect. When there is no external discharge and charging demand, in order to prevent the safety hazards caused by the charge and discharge interface and the AC discharge interface being energized, all relays are disconnected by default.

[0057] It can be seen that the present invention provides a vehicle-mounted integrated external discharge control method, in which the vehicle-mounted charger is electrically connected to the charge and discharge interface and the AC discharge interface respectively through the charge and discharge control box, and then the charge and discharge control box controls the on and off of the electrical connection to realize external discharge of the entire vehicle, thereby solving the inconvenience problem of existing electric vehicle charging and discharging, realizing multiple discharge modes, facilitating user use on the basis of safe discharge, and improving convenience and safety.

[0058] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A vehicle-mounted integrated external discharge control system, characterized in that: include: On-board charger, charge and discharge control box, charge and discharge interface and AC discharge interface; The on-board charger is respectively connected to the charge and discharge control box and the power battery by signal, and the on-board charger is connected to the CC terminal and the CP terminal of the charge and discharge interface by signal; The charge and discharge control box is electrically connected to the L terminal, N terminal and PE terminal corresponding to the charge and discharge interface and the AC discharge interface respectively, and the charge and discharge control box is used to control the on-board charger and the charge and discharge interface and the AC discharge interface. When the charge and discharge control box conducts the electrical connection between the on-board charger and the AC discharge interface, the AC discharge interface provides AC power to the outside; When the charge and discharge control box conducts the electrical connection between the on-board charger and the charge and discharge interface, the on-board charger determines whether the charge and discharge interface is used as a connection port for external discharge or internal charging according to the CC resistance signal.

2. The vehicle-mounted integrated external discharge control system according to claim 1, characterized in that: The L connection terminals corresponding to the charging and discharging interface and the AC discharging interface include: an L1 connection contact, an L2 connection contact and an L3 connection contact, so as to selectively perform single-phase or three-phase electrical connection.

3. The vehicle-mounted integrated external discharge control system according to claim 2, characterized in that: The charge and discharge control box is provided with two groups of L1 connection lines, L2 connection lines, L3 connection lines, N connection lines and PE connection lines to connect with corresponding wiring contacts of the charge and discharge interface and the AC discharge interface.

4. The vehicle-mounted integrated external discharge control system according to claim 3 is characterized in that: The charge and discharge control box comprises: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; The first relay, the second relay, the third relay and the fourth relay are respectively arranged on the corresponding L1 connection line, L2 connection line, L3 connection line and N connection line between the charging and discharging interface and the on-board charger; The fifth relay, the sixth relay, the seventh relay and the eighth relay are respectively arranged on the corresponding L1 connection line, L2 connection line, L3 connection line and N connection line between the AC discharge interface and the vehicle charger.

5. The vehicle-mounted integrated external discharge control system according to claim 4, characterized in that: Also includes: Vehicle controller; The vehicle controller is respectively connected to the control end signals of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, the seventh relay and the eighth relay to control the opening or closing of the corresponding relays.

6. The vehicle-mounted integrated external discharge control system according to claim 5, characterized in that: Also includes: a first thermistor and a second thermistor; The first thermistor is arranged at the relay of the corresponding charging and discharging interface in the charging and discharging control box, and the second thermistor is arranged at the relay of the corresponding AC discharging interface in the charging and discharging control box; The vehicle controller is respectively connected to the first thermistor and the second thermistor signals, and controls the corresponding relay to disconnect when it is detected that the temperature is greater than a set threshold.

7. The vehicle-mounted integrated external discharge control system according to claim 6, characterized in that: Also includes: The third thermistor; The third thermistor is arranged at the AC discharge interface, the vehicle controller is connected to the third thermistor signal, and is used to control the corresponding relay to disconnect when it is used to detect that the temperature generated by the AC discharge interface when discharging to the outside is greater than a set threshold.

8. A vehicle-mounted integrated external discharge control method, using the control system according to any one of claims 1 to 7, characterized in that: include: When the charging gun is inserted into the charging and discharging interface, the on-board charger automatically recognizes that charging is in progress by identifying the effective values ​​of the CP and CC signals, and transmits the charging signal to the vehicle controller through the CAN bus. The vehicle controller controls the first relay, the second relay, the third relay, and the fourth relay corresponding to the charging and discharging interface to be attracted, so that the vehicle enters charging; When the external discharge gun is inserted into the charge and discharge interface, the on-board charger recognizes it as a discharge resistor through the CC resistance signal. When it automatically recognizes external discharge, the external discharge signal is transmitted to the vehicle controller through the CAN bus. The vehicle controller controls the first relay, the second relay, the third relay, and the fourth relay corresponding to the charge and discharge interface to be attracted, so that the vehicle enters external discharge.

9. The vehicle-mounted integrated external discharge control method according to claim 8, characterized in that: Also includes: A discharge button is provided, and the discharge button is connected to the vehicle controller signal. When the discharge button is pressed, the vehicle controller controls the conduction or disconnection of the fifth relay, the sixth relay, the seventh relay and the eighth relay to control the AC discharge interface to discharge or stop discharging externally.

10. The vehicle-mounted integrated external discharge control method according to claim 9, characterized in that: Also includes: When the charging and discharging interface is discharging, if the user wants to draw power through the AC discharging interface, the discharge button triggers the corresponding relay to close, so that the two interfaces of the vehicle can be discharged at the same time; When the user draws power through the AC discharge interface and the discharge gun and charging gun are not inserted into the charge and discharge interface, the corresponding relay is triggered by the discharge button to close, and the first relay, the second relay, the third relay, and the fourth relay corresponding to the charge and discharge interface are controlled by the vehicle controller to be in a disconnected state to prevent false triggering and closure. If it is detected that the relay corresponding to the charge and discharge interface is abnormally closed, the AC discharge interface is actively stopped from discharging to the outside, and a fault is reported.

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