Automatic physical connection and disconnection pure electric vehicle charging system

Abstract

The invention discloses an automatic physical connection and disconnection pure electric vehicle charging system which comprises a charging gun, a charging socket and a charging pile, a charging module is arranged in the charging pile, the charging module comprises a processor, a PWM signal source assembly, a first logic control assembly and a second logic control assembly, the first logic control assembly is connected with the charging gun, and the second logic control assembly is connected with the charging socket. The second logic control assembly is connected with the charging socket, the charging gun comprises a shell, a driving motor and a rack are installed in the shell, the rack is meshed with the output end of the driving motor, a plug inner core set is fixed to the end of the rack, and the processor is connected with the driving motor. According to the invention, by accurately controlling the connection and disconnection time, the exposure time of the charging interface in an electrified state is reduced, so that the ionization corrosion degree is reduced, and the service life of a connector is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a pure electric vehicle charging system with automatic physical connection and disconnection. Background Art

[0002] As the battery capacity of electric vehicles continues to increase, the requirements for charging speed are increasing, and the charging voltage of on-board battery packs is gradually increasing, and 600-800V has become a common voltage range. However, high voltage also increases the safety requirements for charging interfaces. At the same time, the problem of ionization corrosion is becoming more and more serious, which greatly affects the service life of connectors.

[0003] At the same time, if the charging gun is not physically disconnected in time after charging, part of the electrodes will be exposed to the air, which will be affected by the air and humidity of the external environment, which will accelerate the corrosion of the electrodes, not only reducing the charging efficiency, but also possibly causing electrical failures and safety hazards. Therefore, the automatic physical connection and disconnection charging system is designed, which detects the power-on state of the charging gun, determines the state of the charging gun, and further controls the automatic extension and retraction of the electrodes according to the state of the charging gun, so as to realize the automatic extension and connection of the electrodes and the receiving end of the vehicle during charging, and the automatic retraction and disconnection of the electrodes and the receiving end after charging is completed. Summary of the invention

[0004] The purpose of the present invention is to provide a pure electric vehicle charging system with automatic physical connection and disconnection. Through the automatic connection and disconnection functions, the safety risks caused by improper human plugging and unplugging are avoided. At the same time, the connection and disconnection time is accurately controlled, the exposure time of the charging interface in the charged state is reduced, the degree of ionization corrosion is reduced, and the service life is extended.

[0005] The present invention provides the following technical solutions: a pure electric vehicle charging system with automatic physical connection and disconnection, comprising a charging gun, a charging socket and a charging pile, wherein a charging module is arranged in the charging pile, wherein the charging module comprises a processor, a PWM signal source component, a logic control component 1 and a logic control component 2, wherein the logic control component 1 is connected to the charging gun to realize the logic control of the gun-pulling and gun-connecting states, the logic control component 2 is connected to the charging socket to realize the control of the charging socket, and the PWM signal source component selects to transmit a PWM signal to the charging gun or the charging socket for charging control;

[0006] A metering unit 1 and a metering unit 2 are also provided. The metering unit 1 is used to measure and monitor the charging power of the charging gun. At the same time, the metering unit 1 is also configured with a communication interface 1 to transmit the charging power and charging current data to the charging module. The metering unit 2 is used to measure and monitor the charging power and current of the charging socket. The metering unit 2 is also configured with a communication interface 2 to transmit the charging data to the charging module.

[0007] A circuit breaker 1 and a circuit breaker 2 are provided. The circuit breaker 1 is connected to the metering unit 1 and the charging gun. According to the instructions of the processor, the power supply of the charging gun is controlled to be turned on and off to ensure the safety of the charging process. The circuit breaker 2 is connected to the metering unit 2 and the charging socket to control the charging safety of the charging socket.

[0008] The charging gun includes a shell, in which a driving motor and a rack are installed. The output end of the driving motor is meshed with a rack, and a plug core group is fixed to the end of the rack. The processor is connected to the driving motor to control the forward or reverse rotation of the driving motor.

[0009] According to the above technical solution, a lock link button, a spring, a lock and a lock pressure plate are provided on the shell. The lock link button is formed on one end of the lock, and a lock pressure plate is formed on the other end of the lock. The lock is rotatably connected in the shell through a lock pin. The lower end of the lock close to the lock link button end is connected with a spring. By pressing the lock link button downward, the lock performs a lever movement with the lock pin as the center, so that the lock pressure plate is lifted. When the lock pressure plate is pressed down, the inner core group of the plug is locked.

[0010] According to the above technical solution, a micro switch is arranged below the lock link button, and pressing the lock link button downward will press the micro switch to turn on the micro switch.

[0011] According to the above technical solution, a front end cover is formed at the end of the shell, and a guide positioning groove is formed on the inner side of the front end cover, and the guide positioning groove is used to guide the movement of the inner core group of the plug.

[0012] According to the above technical solution, a positioning spring is arranged at the rear side of the plug inner core group, and the positioning spring positions and buffers the plug inner core group.

[0013] According to the above technical solution, the charging socket includes a control confirmation line CP, a charging connection confirmation line CC, a first AC power source N, a second AC power source L, a first standby terminal NC1, a second standby terminal NC2 and a vehicle body ground PE.

[0014] According to the above technical solution, the charging steps of the charging gun are as follows:

[0015] S1. Connection confirmation: The charging socket determines the connection status of the charging gun and the rated current of the charging wire by measuring the resistance value R between the detection point CP and the vehicle body ground PE. The charging pile determines the connection status of the charging gun by measuring the voltage value of the detection point CC. If the voltage value = 9V, it means that the charging gun is fully connected;

[0016] S2, charging request: After the charging pile detects that the charging gun is fully connected, it switches the PWM signal source component and outputs a PWM signal to transmit the charging request and the current maximum supported charging current to the electric vehicle;

[0017] S3, charging confirmation: The electric vehicle detects the PWM signal through the detection point CP. When the on-board charger self-check is completed and the battery pack can be charged, the switch is closed. The charging pile determines whether the electric vehicle is ready by measuring the voltage value of the detection point CP. If the voltage value = 6V, the power supply circuit is turned on;

[0018] S4, start charging: After the electric vehicle and the charging pile are electrically connected, the electric vehicle confirms the maximum charging current CI currently supported by the charging pile according to the duty cycle of the PWM signal at the detection point CC, and selects the minimum value as the maximum allowable input current of the on-board charger according to the rated current of the charging wire, CI and the rated input current of the on-board charger, and starts charging;

[0019] S5, charging monitoring: electric vehicles periodically monitor detection points CC and CP, and charging piles periodically monitor detection point C1 to confirm the connection status and chargeable status of the charging gun, etc. The monitoring period is no more than 50ms; electric vehicles continuously detect the PWM signal of detection point C2, and when the signal duty cycle changes, the output power of the on-board charger is adjusted in real time, and the detection period is no more than 5s;

[0020] S6, normal charging ends or stops: When the charging end condition set by the electric vehicle or the charging pile is reached, the charging ends. If the charging end signal comes from the electric vehicle, the electric vehicle disconnects S2, and the charging pile switches the PWM signal source component to output 12V and disconnects the power supply circuit; if the charging end signal comes from the charging pile, the charging pile first switches the PWM signal source component to output 12V, and the electric vehicle disconnects S2 after detecting that the detection point C2 is a non-PWM signal, and the charging pile then disconnects the power supply circuit. At this time, the drive motor switch K7 is triggered, and the control system starts the drive motor to rotate in the opposite direction, driving the rack to move in the opposite direction, thereby pushing the plug core group to move backward, realizing the physical separation of the electrodes;

[0021] S7. Abnormal termination of charging: When the electric vehicle detects that the charging gun connection status is abnormal or the PWM signal is interrupted, or the charging pile detects that the actual charging current is abnormal, it should stop charging and disconnect the power supply circuit in time, and switch the PWM signal source component to output 12V; the charging pile can detect the gun jumping in time by periodically monitoring the actual charging current, and at the same time the drive motor switch is triggered, the control system starts the drive motor to rotate in the opposite direction, driving the rack to move in the opposite direction, thereby pushing the plug core group to move backward, and the electrodes are physically separated.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0023] (1) When manually plugging in the charging gun, the lock is unlocked by manually pressing the lock link button, and the micro switch is pressed at the same time to transmit a signal to the processor to push the plug core group out, so that the electrodes of the charging gun are engaged with the electrodes of the charging socket;

[0024] (2) After charging is completed, the charging pile disconnects the power supply and stops power transmission. The processor transmits a reverse signal to the drive motor to control the reverse movement of the drive motor, and drives the plug core group to move in the opposite direction through the rack, retracting the plug core group, so that the electrodes of the plug core group are separated from the electrodes of the power receiving end, making it easier to pull out the charging gun;

[0025] (3) The automatic connection and disconnection function avoids safety risks caused by improper plugging and unplugging. At the same time, the connection and disconnection time is precisely controlled, which reduces the exposure time of the charging interface in the charged state, reduces the degree of ionization corrosion, and extends the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 is a schematic diagram of the internal structure of the charging gun of the present invention;

[0028] Figure 2 It is the operation flow chart of the present invention;

[0029] Figure 3 It is a circuit schematic diagram of the present invention;

[0030] Figure 4 is a structural diagram of the charging socket of the present invention;

[0031] In the figure: 1. Shell; 2. Plug core assembly; 3. Front cover; 4. Positioning spring; 5. Lock; 6. Micro switch; 7. Lock pin; 8. Spring; 9. Sealing ring A; 10. Outlet rubber ring; 11. Lock connecting rod button; 12. Lock pressure plate; 13. Drive motor; 14. Rack; 15. Guide positioning groove; 16. Sealing ring B. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 and 2The present invention provides a technical solution: a pure electric vehicle charging system with automatic physical connection and disconnection, including a charging gun, a charging socket and a charging pile, the charging gun is connected to the charging pile, the charging socket is installed on the vehicle, a charging module is arranged in the charging pile, and the charging module includes a processor, a PWM signal source component, a logic control component 1 and a logic control component 2, the logic control component 1 is connected to the charging gun, controls the on and off of the relay, and realizes the logic control of the gun drawing and gun connection state, the logic control component 2 is connected to the charging socket, realizes the control of the charging socket, and the PWM signal source component selects to transmit the PWM signal to the charging gun or the charging socket for charging control;

[0034] A metering unit 1 and a metering unit 2 are also provided. The metering unit 1 is used to measure and monitor the charging power of the charging gun. At the same time, the metering unit 1 is also configured with a communication interface 1 to transmit the charging power and charging current data to the charging module. The metering unit 2 is used to measure and monitor the charging power and current of the charging socket. The metering unit 2 is also configured with a communication interface 2 to transmit the charging data to the charging module.

[0035] Circuit breaker 1 and circuit breaker 2 are set. Circuit breaker 1 is connected to metering unit 1 and charging gun. According to the instructions of the processor, the power supply of the charging gun is controlled to be turned on and off to ensure the safety of the charging process. Circuit breaker 2 is connected to metering unit 2 and charging socket to control the charging safety of the charging socket.

[0036] like Figure 1 As shown, the charging gun includes a shell, in which a driving motor 13 and a rack 14 are installed. The output end of the driving motor 13 is meshed with the rack 14, and the end of the rack 14 is fixed with a plug core group 2. The processor is connected to the driving motor 13, and the processor controls the forward or reverse rotation of the driving motor 13 to extend or retract the rack 14, further driving the plug core group 2 to extend or retract. The automatic connection and disconnection function can avoid problems such as poor contact and arcing caused by improper human plugging and unplugging, reduce the risk of electric shock and fire, and at the same time, by accurately controlling the connection and disconnection time, reduce the exposure time of the charging interface in a charged state, thereby reducing the degree of ionization corrosion and extending the service life of the connector.

[0037] A lock link button 11, a spring 8, a lock 5 and a lock pressure plate 12 are provided on the shell 1. The lock link button 11 is formed on one end of the lock 5, and a lock pressure plate 12 is formed on the other end of the lock 5. The lock 5 is rotatably connected to the shell 1 through the lock pin 7. The lower end of the lock 5 close to the lock link button 11 is connected with a spring 8. By pressing the lock link button 11, the lock 5 is subjected to a lever movement with the lock pin 7 as the center, so that the lock pressure plate 12 is lifted. When the lock pressure plate 12 is pressed down, the end of the lock pressure plate 12 moves to one side of the plug core group 2 to lock the plug core group 2. When plugging in for charging, the charging gun is inserted into place, and the lock pressure plate 12 is locked under the action of the power receiving end to prevent the lock pressure plate 12 from resetting and affecting the extension of the plug core group 2.

[0038] A micro switch 6 is arranged below the lock link button 11. Pressing the lock link button 11 downward will press the micro switch 6 to turn on the micro switch 6. The micro switch 6 will send a signal to the processor. After receiving the signal, the processor will start the drive motor 13 to drive the rack 14 to move, push out the plug core group 2, and move the plug core group 2 into the charging socket.

[0039] A front end cover 3 is formed at the end of the shell 1, and a guide positioning groove 15 is formed on the inner side of the front end cover 3. The guide positioning groove 15 is used to guide the movement of the plug core group 2 so that the plug core group 2 moves smoothly and is aligned with the electrode of the power receiving end. A sealing ring A9 and a wire outlet rubber ring 10 are sleeved on the wire at the end of the shell 1. The sealing ring A9 and the wire outlet rubber ring 10 ensure the sealing of the wire outlet. At the same time, a sealing ring B16 is also provided at the end of the lock pressure plate 12 to ensure the sealing performance.

[0040] A positioning spring 4 is arranged at the rear side of the plug inner core group 2 . The positioning spring 4 provides positioning and buffering for the plug inner core group 2 . The positioning spring 4 is used to position the initial position of the plug inner core group 2 .

[0041] like Figure 4 As shown, the charging socket includes a control confirmation line CP, a charging connection confirmation line CC, a first AC power supply N, a second AC power supply L, a first spare terminal NC1, a second spare terminal NC2 and a vehicle body ground PE. An electronic lock is also configured in the charging socket to prevent accidental disconnection during charging. After charging, the dual-head charging gun can be unlocked to prevent the socket from being occupied.

[0042] The charging steps of the charging gun are as follows:

[0043] S1. Connection confirmation: The charging socket determines the connection status of the charging gun and the rated current of the charging wire by measuring the resistance value R between the detection point CP and the vehicle body ground PE. If R is infinite, it means that the charging gun is not connected. The charging pile determines the connection status of the charging gun by measuring the voltage value of the detection point CC. If the voltage value = 9V, it means that the charging gun is fully connected.

[0044] S2, charging request: After the charging pile detects that the charging gun is fully connected, it switches the PWM signal source component and outputs a PWM signal to transmit the charging request and the current maximum supported charging current to the electric vehicle;

[0045] S3, charging confirmation: The electric vehicle detects the PWM signal through the detection point CP. When the on-board charger self-check is completed and the battery pack can be charged, the switch is closed. The charging pile determines whether the electric vehicle is ready by measuring the voltage value of the detection point CP. If the voltage value = 6V, the power supply circuit is turned on;

[0046] S4, start charging: After the electric vehicle and the charging pile are electrically connected, the electric vehicle confirms the maximum charging current currently supported by the charging pile according to the duty cycle of the PWM signal at the detection point CC, and selects the minimum value as the maximum allowable input current of the on-board charger according to the rated current carrying capacity of the charging wire, the maximum charging current and the rated input current value of the on-board charger, and starts charging;

[0047] S5, charging monitoring: electric vehicles periodically monitor detection points CC and CP, and charging piles periodically monitor detection point C1 to confirm the connection status and chargeable status of the charging gun, etc. The monitoring period is no more than 50ms; electric vehicles continuously detect the PWM signal of detection point C2, and when the signal duty cycle changes, the output power of the on-board charger is adjusted in real time, and the detection period is no more than 5s;

[0048] S6, normal charging ends or stops: When the charging end condition set by the electric vehicle or the charging pile is reached, the charging ends. If the charging end signal comes from the electric vehicle, the electric vehicle disconnects S2, and the charging pile switches the PWM signal source component to output 12V and disconnects the power supply circuit; if the charging end signal comes from the charging pile, the charging pile first switches the PWM signal source component to output 12V, and the electric vehicle disconnects S2 after detecting that the detection point C2 is a non-PWM signal, and the charging pile then disconnects the power supply circuit. At this time, the switch K7 of the drive motor 13 is triggered, and the control system starts the drive motor 13 to rotate in the reverse direction, driving the rack 14 to move in the reverse direction, thereby pushing the plug core group 2 to move backward, and realizing the physical separation of the electrodes;

[0049] S7. Abnormal termination of charging: When the electric vehicle detects that the charging gun connection status is abnormal or the PWM signal is interrupted, or the charging pile detects that the actual charging current is abnormal, it should stop charging and disconnect the power supply circuit in time, and switch the PWM signal source component to output 12V; the charging pile can detect the gun jumping in time by periodically monitoring the actual charging current, and at the same time, the switch of the drive motor 13 is triggered, and the control system starts the drive motor 13 to rotate in the reverse direction, driving the rack 14 to move in the reverse direction, thereby pushing the plug core group 2 to move backward, and the electrodes are physically separated.

[0050] The action flow of the charging gun is as follows:

[0051] When charging: press the lock link button to unlock the lock, lift the lock plate to avoid locking the plug core group, then insert the charging gun into place, lock the lock plate, and at the same time, under the action of the lock pin, make the lock do lever movement, drive the lock link button to move downward, press the micro switch, the micro switch transmits a signal to the processor, and the processor starts the drive motor after receiving the signal, drives the rack to move, so that the rack pushes the plug core group along the guide positioning groove to the power receiving end, so that the electrode of the plug core group is close to and aligned with the electrode of the power receiving end. When the two electrodes are fully engaged, the drive motor stops running, the charging gun and the vehicle power receiving end are reliably electrically connected, and the charging pile can start charging the electric vehicle;

[0052] Charging completed: After charging reaches the set voltage or charging stops, the charging pile first disconnects the power supply and stops power transmission. At the same time, the processor sends a reverse operation signal to the drive motor, driving the motor to reverse, and driving the plug core group to move in the opposite direction along the guide positioning groove through the rack, gradually separating the electrodes of the plug core group from the electrodes at the power receiving end of the vehicle until they are completely detached. The drive motor stops running, the entire detachment process is completed, and the charging gun can be safely pulled out.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pure electric vehicle charging system with automatic physical connection and disconnection, comprising a charging gun, a charging socket and a charging pile, characterized in that: The charging pile is provided with a charging module, which includes a processor, a PWM signal source component, a logic control component 1 and a logic control component 2. The logic control component 1 is connected to the charging gun to realize the logic control of the gun drawing and gun connection states. The logic control component 2 is connected to the charging socket to realize the control of the charging socket. The PWM signal source component selects to transmit a PWM signal to the charging gun or the charging socket for charging control; A metering unit 1 and a metering unit 2 are also provided. The metering unit 1 is used to measure and monitor the charging power of the charging gun. At the same time, the metering unit 1 is also configured with a communication interface 1 to transmit the charging power and charging current data to the charging module. The metering unit 2 is used to measure and monitor the charging power and current of the charging socket. The metering unit 2 is also configured with a communication interface 2 to transmit the charging data to the charging module. A circuit breaker 1 and a circuit breaker 2 are provided. The circuit breaker 1 is connected to the metering unit 1 and the charging gun. According to the instructions of the processor, the power supply of the charging gun is controlled to be turned on and off to ensure the safety of the charging process. The circuit breaker 2 is connected to the metering unit 2 and the charging socket to control the charging safety of the charging socket. The charging gun includes a shell, in which a driving motor and a rack are installed. The output end of the driving motor is meshed with a rack, and a plug core group is fixed to the end of the rack. The processor is connected to the driving motor to control the forward or reverse rotation of the driving motor.

2. The automatic physical connection and disconnection pure electric vehicle charging system according to claim 1, characterized in that: The shell is provided with a lock link button, a spring, a lock and a lock pressure plate, the lock link button is formed on one end of the lock, and the lock pressure plate is formed on the other end of the lock, the lock is rotatably connected in the shell through a lock pin, and the lower end of the lock close to the lock link button is connected with a spring, and the lock is subjected to a lever movement with the lock pin as the center by pressing the lock link button downward, so that the lock pressure plate is lifted, and the plug inner core group is locked when the lock pressure plate is pressed downward.

3. The automatic physical connection and disconnection pure electric vehicle charging system according to claim 2, characterized in that: A micro switch is arranged below the lock link button, and pressing the lock link button downward presses the micro switch to turn it on.

4. The automatic physical connection and disconnection pure electric vehicle charging system according to claim 1, characterized in that: A front end cover is formed at the end of the shell, and a guide positioning groove is formed on the inner side of the front end cover. The guide positioning groove is used to guide the movement of the inner core group of the plug.

5. The automatic physical connection and disconnection pure electric vehicle charging system according to claim 1, characterized in that: A positioning spring is arranged at the rear side of the plug inner core group, and the positioning spring performs positioning and buffering on the plug inner core group.

6. The automatic physical connection and disconnection pure electric vehicle charging system according to claim 1, characterized in that: The charging socket includes a control confirmation line CP, a charging connection confirmation line CC, a first AC power source N, a second AC power source L, a first standby terminal NC1, a second standby terminal NC2 and a vehicle body ground PE.

7. The automatic physical connection and disconnection pure electric vehicle charging system according to claim 6, characterized in that: The charging steps of the charging gun are as follows: S1. Connection confirmation: The charging socket determines the connection status of the charging gun and the rated current of the charging wire by measuring the resistance value R between the detection point CP and the vehicle body ground PE. The charging pile determines the connection status of the charging gun by measuring the voltage value of the detection point CC. If the voltage value = 9V, it means that the charging gun is fully connected; S2, charging request: After the charging pile detects that the charging gun is fully connected, it switches the PWM signal source component and outputs a PWM signal to transmit the charging request and the current maximum supported charging current to the electric vehicle; S3, charging confirmation: The electric vehicle detects the PWM signal through the detection point CP. When the on-board charger self-check is completed and the battery pack can be charged, the switch is closed. The charging pile determines whether the electric vehicle is ready by measuring the voltage value of the detection point CP. If the voltage value = 6V, the power supply circuit is turned on; S4, start charging: After the electric vehicle and the charging pile are electrically connected, the electric vehicle confirms the maximum charging current CI currently supported by the charging pile according to the duty cycle of the PWM signal at the detection point CC, and selects the minimum value as the maximum allowable input current of the on-board charger according to the rated current of the charging wire, CI and the rated input current of the on-board charger, and starts charging; S5, charging monitoring: electric vehicles periodically monitor detection points CC and CP, and charging piles periodically monitor detection point C1 to confirm the connection status and chargeable status of the charging gun, etc. The monitoring period is no more than 50ms; electric vehicles continuously detect the PWM signal of detection point C2, and when the signal duty cycle changes, the output power of the on-board charger is adjusted in real time, and the detection period is no more than 5s; S6, normal charging ends or stops: When the charging end condition set by the electric vehicle or the charging pile is reached, the charging ends. If the charging end signal comes from the electric vehicle, the electric vehicle disconnects S2, and the charging pile switches the PWM signal source component to output 12V and disconnects the power supply circuit; if the charging end signal comes from the charging pile, the charging pile first switches the PWM signal source component to output 12V, and the electric vehicle disconnects S2 after detecting that the detection point C2 is a non-PWM signal, and the charging pile then disconnects the power supply circuit. At this time, the drive motor switch K7 is triggered, and the control system starts the drive motor to rotate in the opposite direction, driving the rack to move in the opposite direction, thereby pushing the plug core group to move backward, realizing the physical separation of the electrodes; S7. Abnormal termination of charging: When the electric vehicle detects that the charging gun connection status is abnormal or the PWM signal is interrupted, or the charging pile detects that the actual charging current is abnormal, it should stop charging and disconnect the power supply circuit in time, and switch the PWM signal source component to output 12V; the charging pile can detect the gun jumping in time by periodically monitoring the actual charging current, and at the same time the drive motor switch is triggered, the control system starts the drive motor to rotate in the opposite direction, driving the rack to move in the opposite direction, thereby pushing the plug core group to move backward, and the electrodes are physically separated.

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