CN213936768U

CN213936768U - Charging and discharging connection device, electric vehicle and charging and discharging system

Info

Publication number: CN213936768U
Application number: CN202022749812.XU
Authority: CN
Inventors: 凌和平; 黄伟; 曹露蓉; 李超; 宋金梦
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-08-10
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a charge-discharge connecting device, electric vehicle and charge-discharge system, charge-discharge connecting device, include: the first plug comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first switch, wherein one end of the first resistor is connected to the grounding terminal of the first plug so as to be connected with the body ground of the discharging vehicle; one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected to the first connection confirmation terminal of the first plug so as to be connected with the first connection confirmation terminal of the discharging vehicle; the first switch is connected with the first resistor in parallel; one end of the third resistor is connected to the ground terminal of the first plug, and the other end of the third resistor is connected to the second connection confirmation terminal of the first plug so as to connect the second connection confirmation terminal of the discharging vehicle through the first controllable switch; one end of the fourth resistor is connected to the second connection confirmation terminal of the first plug so as to realize safe and reliable charging.

Description

Charging and discharging connection device, electric vehicle and charging and discharging system

Technical Field

The utility model relates to the technical field of vehicles, especially, relate to a charge-discharge connecting device, electric vehicle and charge-discharge system.

Background

In the related art, when an electric vehicle charges the vehicle by conducting charging and discharging through the vehicle, generally, only the connection state between the charging and discharging connection device and the two vehicles is determined by a control guidance circuit, and charging and discharging control is performed when the connection is confirmed. In the charging and discharging process, if the user pulls out the charging and discharging connection device when the charging is not finished, the personal safety of the user may be damaged.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a charging and discharging connection device to ensure the safety and reliability of the charging and discharging process.

A second object of the present invention is to provide an electric vehicle.

A third object of the present invention is to provide a charge/discharge system.

In order to achieve the above object, the utility model discloses a first aspect provides a charge-discharge connecting device, include: the device comprises a first plug and a second plug, wherein a first resistor, a second resistor, a third resistor, a fourth resistor and a first switch are arranged in the first plug, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second switch are arranged in the second plug, one end of the first resistor is connected to a grounding terminal of the first plug, and the grounding terminal of the first plug is used for being connected with a vehicle body ground of a discharging vehicle; one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected to a first connection confirmation terminal of the first plug, wherein the first connection confirmation terminal of the first plug is used for connecting a first connection confirmation terminal of the discharging vehicle; the first switch is connected with the first resistor in parallel; one end of the third resistor is connected to the ground terminal of the first plug, and the other end of the third resistor is connected to the second connection confirmation terminal of the first plug, wherein the second connection confirmation terminal of the first plug is used for connecting the second connection confirmation terminal of the discharging vehicle through the first controllable switch; one end of the fourth resistor is connected to a second connection confirmation terminal of the first plug; one end of the fifth resistor is connected to a ground terminal of the second plug, wherein the ground terminal of the second plug is used for connecting a body ground of a power receiving vehicle; one end of the sixth resistor is connected to the other end of the fifth resistor, and the other end of the sixth resistor is connected to a first connection confirmation terminal of the second plug, where the first connection confirmation terminal of the second plug is used to connect to a first connection confirmation terminal of the power receiving vehicle; the second switch is connected with the fifth resistor in parallel; one end of the seventh resistor is connected to the ground terminal of the second plug, and the other end of the seventh resistor is connected to a second connection confirmation terminal of the second plug, which is used for connecting the second connection confirmation terminal of the power receiving vehicle through a second controllable switch; one end of the eighth resistor is connected to the second connection confirmation terminal of the second plug, and the other end of the eighth resistor is connected to the other end of the fourth resistor; the first plug and the second plug are connected through a cable, and when the first plug and the discharging vehicle are in a connected state and the second plug and the power receiving vehicle are in a connected state, the rated current of the cable is determined according to the voltage of a second connection confirmation terminal of the discharging vehicle.

The utility model discloses a charge-discharge connecting device can realize discharging between vehicle and the powered vehicle and be connected to can be connected the guide to discharging between vehicle and the powered vehicle, from this, can guarantee the security and the reliability of charge-discharge process.

To achieve the above object, a second aspect of the present invention provides an electric vehicle, including: a socket for connecting a first plug or a second plug in the charge and discharge connection device according to any one of the embodiments of the present invention; the first detection unit and the second detection unit are respectively connected with the socket, the first detection unit is used for detecting the charging and discharging connection state between the socket and the first plug or the second plug so as to generate a first detection signal, and the second detection unit is used for detecting the charging and discharging connection state between the socket and the charging and discharging equipment so as to generate a second detection signal; the vehicle control device is respectively connected with the first detection unit and the second detection unit and is used for carrying out charge and discharge control on the electric vehicle according to the first detection signal and the second detection signal.

The utility model discloses an electric vehicle can combine foretell charge-discharge connecting device, realizes the connection guide between the vehicle, and then helps guaranteeing the security and the reliability of charge-discharge process.

In order to achieve the above object, the third aspect of the present invention provides a charging and discharging system, including: two of the above electric vehicles are referred to as a discharging vehicle and a receiving vehicle, respectively; and the charging and discharging connection device; wherein the charge/discharge connection device is connected between the discharging vehicle and the power receiving vehicle.

The utility model discloses charge-discharge system, through foretell charge-discharge connecting device and electric vehicle, can improve electric vehicle charge-discharge's security and reliability.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a topology diagram of a charge and discharge connection device according to a first embodiment of the present invention;

fig. 2 is a topological view of a charge and discharge connection device according to a second embodiment of the present invention;

fig. 3 is a topological diagram of a charging and discharging connection device according to a specific example of the present invention;

fig. 4 is a topological view of a charge and discharge connection device according to a third embodiment of the present invention;

fig. 5 is a topological diagram of a charging and discharging connection device according to another example of the present invention;

fig. 6 is a block diagram of an electric vehicle according to an embodiment of the present invention;

fig. 7 is a block diagram of an electric vehicle according to another embodiment of the present invention;

fig. 8 is a block diagram showing a structure of the charge/discharge system according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The charge and discharge connecting device, the electric vehicle, and the charge and discharge system according to the embodiment of the present invention will be described below with reference to fig. 1 to 8.

Referring to fig. 1 to 5, the charge and discharge connecting device 100 includes a first plug 110 and a second plug 120 connected. Wherein, the first plug 110 can be adapted to the socket 210 of the discharging vehicle 200, the second plug 120 is adapted to the socket 310 of the powered vehicle 300, and the first plug 110 and the second plug 120 are connected by a cable.

Referring to fig. 1, the first plug 110 and the second plug 120 include 8 or 9 pins, which are respectively a DC + pin, a DC-pin, a PE pin, an S + pin, an S-pin, an a + pin, an a-pin, a CC1 pin and/or a CC2 pin. The DC + pin, the DC-pin, the PE pin, the S + pin, the S-pin, the A + pin and the A-pin are respectively and correspondingly connected with a DC + line, a DC-line, a PE line, an S + line, an S-line, an A + line and an A-line of the cable. Correspondingly, the

sockets

210 and 310 of the discharging vehicle 200 and the receiving vehicle 300 are correspondingly provided with jacks, which are respectively a DC + jack, a DC-jack, a PE jack, an S + jack, an S-jack, an a + jack, an a-jack, a CC1 jack and/or a CC2 pin. Of course, the first plug 110 may also include a socket, and the socket 210 includes a pin. Besides the pin and the jack, other connecting structures can be adopted, and the connecting structure is not limited here. Accordingly, the structure of the second plug 120 may be the same as that of the first plug 110.

In an embodiment of the present invention, referring to fig. 1, a first resistor R3, a second resistor R5, a third resistor R6, a fourth resistor R7 and a first switch S1 are disposed in the first plug 110. One end of the first resistor R3 is connected to a ground terminal of the first plug 110, i.e., a PE pin, wherein the ground terminal of the first plug 110 is used for connecting a body ground of the discharge vehicle 200; one end of the second resistor R5 is connected to the other end of the first resistor R3, and the other end of the second resistor R5 is connected to a first connection confirmation terminal of the first plug 110, i.e., a CC2 pin, wherein the first connection confirmation terminal of the first plug 110 is used for connecting to a first connection confirmation terminal of the discharging vehicle 200, and the first connection confirmation terminal of the discharging vehicle 200 is connected to the first preset power source U2 through the ninth resistor R2; the first switch S1 is connected in parallel with the second resistor R5. One end of the third resistor R6 is connected to the ground terminal of the first plug 110, and the other end of the third resistor R6 is connected to the second connection confirmation terminal of the first plug 110, wherein the second connection confirmation terminal of the first plug 110 is used for connecting the second connection confirmation terminal of the discharging vehicle 200 through the first controllable switch K7, and the second connection confirmation terminal of the discharging vehicle 200 is connected to the second preset power source U1 through the tenth resistor R1; one end of the fourth resistor R7 is connected to the second connection confirmation terminal of the first plug 110.

The first switch S1 may be a normally closed switch, and the first switch S1 may be in an off state through manual operation when the pin of the first plug 110 is inserted into the socket 210 of the discharging vehicle 200 or pulled out from the socket 210, for example, the first plug 110 may be provided with a button, when the button is pressed, the first switch S1 is turned off, at this time, the pin of the first plug 110 may be inserted into the socket 210 or the pin of the first plug 110 is pulled out from the socket 210, and when the pin of the first plug 110 is inserted into the socket 210, the button is released, and the first switch S1 is closed; the operation of connecting the second header 120 to the socket 310 is similar. The first controllable switch K7 may be a normally open switch, and when the discharging vehicle 200 charges the off-board charger (i.e., the public dc charging station/charging device), the first controllable switch K7 is turned off, and the resistor R4 in the socket 210 of the discharging vehicle 200 is not connected to the second preset power supply U1 and the resistor R6, so that the connection determination of the off-board charger is not affected, and the discharging vehicle 200 may be normally charged; when the V2V charging, namely the charging and discharging between the two electric vehicles, is carried out, the first controllable switch K7 is controlled to be closed. Thus, it is ensured by the first controllable switch K7 that charging interoperability is not disturbed and that the guiding action of V2V is ensured.

Referring to fig. 1, the first connection confirmation terminal of the discharging vehicle 200 serves as a first charge and discharge connection confirmation detection point (i.e., detection point 2 in fig. 1) of the discharging vehicle 200 so as to recognize a charge and discharge connection state between the first plug 110 and the discharging vehicle 200 from the first charge and discharge connection confirmation detection point voltage of the discharging vehicle 200.

In this example, if the first charge-discharge connection confirmation detection point voltage of the discharging vehicle 200 is 0, the discharging function of the discharging vehicle 200 is not started; if the first charging and discharging connection confirmation detection point voltage of the discharging vehicle 200 is the first voltage, the first plug 110 and the discharging vehicle 200 are in an unconnected state; if the first charging and discharging connection of the discharging vehicle 200 confirms that the voltage of the detection point is a second voltage, the first plug 110 and the discharging vehicle 200 are in a half-connection state, wherein the second voltage is less than the first voltage; if the first charging and discharging connection confirmation detection point voltage of the discharging vehicle 200 is a third voltage, the first plug 110 and the discharging vehicle 200 are in a full connection state, wherein the third voltage is less than the second voltage.

Specifically, referring to fig. 1, when the voltage at detection point 2 is 0, it is explained that the discharging function of discharging vehicle 200 is not started. When the pin of the first plug 110 is not inserted into the socket 210, the first predetermined power source U2 supplies power to the resistor R2, and the voltage at the detection point 2 is the first voltage (e.g., U2 is 12V), so that when the voltage at the detection point 2 is the first voltage (e.g., 12V), the first plug 110 and the socket 210 of the discharging vehicle 200 are in an unconnected state. When the first switch S1 is turned off and the pins of the first plug 110 are inserted into the sockets 210, the U1 supplies power to the resistors R2, R3, and R5, wherein the series-connected R3, R5, and R2 are connected in series, and the voltage at the detection point 2 is reduced to a second voltage (R5+ R3)/(R2+ R5+ R3) × U2, which is smaller than the first voltage U2, so that the first plug 110 and the sockets 210 of the discharging vehicle 200 are in a half-connected state when the first charging/discharging connection of the discharging vehicle 200 confirms that the detection point voltage is the second voltage. When the first switch S1 is closed and the pin of the first plug 110 is inserted into the discharging receptacle 210, the U1 supplies power to the resistors R2 and R5, wherein the R5 and the R2 are connected in series, and the voltage at the detection point 2 is further reduced to a third voltage R5/(R2+ R5) × U2, so that the first plug 110 and the receptacle 210 of the discharging vehicle 200 are in a fully connected state when the first charging and discharging connection of the discharging vehicle 200 confirms that the voltage at the detection point is the third voltage R5/(R2+ R5) × U2. This realizes recognition of the charge/discharge connection state between first plug 110 and socket 210 of discharge vehicle 200 on the discharge vehicle 200 side.

Referring to fig. 1, a fifth resistor R3 ', a sixth resistor R5 ', a seventh resistor R6 ', an eighth resistor R7 ' and a second switch S1 ' are disposed in the second plug 120. One end of fifth resistor R3' is connected to the ground terminal of second plug 120, i.e., the PE pin, where the ground terminal of second plug 120 is used to connect to the body ground of powered vehicle 300; one end of the sixth resistor R5 ' is connected to the other end of the fifth resistor R3 ', and the other end of the sixth resistor R5 ' is connected to the first connection confirmation terminal of the second plug 120, i.e., the CC2 pin, wherein the first connection confirmation terminal of the second plug 120 is used for connecting the first connection confirmation terminal of the powered vehicle 300, and the first connection confirmation terminal of the powered vehicle 300 is connected to the third preset power source U2 ' through the eleventh resistor R2 '; the second switch S1 'is connected in parallel with the fifth resistor R3'. One end of a seventh resistor R6 ' is connected to the ground terminal of the second plug 120, and the other end of the seventh resistor R6 ' is connected to a second connection confirmation terminal of the second plug 120, wherein the second connection confirmation terminal of the second plug 120 is used for connecting a second connection confirmation terminal of the powered vehicle 300 through the second controllable switch K7 ', and the second connection confirmation terminal of the powered vehicle 300 is connected to the fourth preset power source U1 ' through the twelfth resistor R1 '; one end of the eighth resistor R7 'is connected to the second connection confirmation terminal of the second plug 120, and the other end of the eighth resistor R7' is connected to the other end of the fourth resistor.

In this embodiment, when the first connection confirmation terminal CC2 of the power receiving vehicle 300 is used as the first charge/discharge connection confirmation detection point (i.e., the detection point 2' in fig. 1) of the power receiving vehicle 300, if the first charge/discharge connection confirmation detection point voltage of the power receiving vehicle 300 is 0, the charging function of the power receiving vehicle is not activated; if the first charge/discharge connection confirmation detection point voltage of power-receiving vehicle 300 is fourth voltage U2', second plug 120 and power-receiving vehicle 300 are in an unconnected state; if the first charging/discharging connection of powered vehicle 300 confirms that the detection point voltage is a fifth voltage (R5 '+ R3')/(R2 '+ R5' + R3 ')/U2', second plug 120 and powered vehicle 300 are in a half-connected state, where the fifth voltage is less than the fourth voltage; if the first charge/discharge connection confirmation detection point voltage of the powered vehicle 300 is the sixth voltage (R2 ' + R5 ')/U2 ', the second plug 120 and the powered vehicle 300 are in the fully connected state, where the sixth voltage is smaller than the fifth voltage.

Meanwhile, referring to fig. 1, when the second connection confirmation terminal of the discharging vehicle 200 serves as the second charge-discharge connection confirmation detection point (i.e., detection point 1 in fig. 1) of the discharging vehicle 200, if the second charge-discharge connection confirmation detection point voltage of the discharging vehicle 200 is the seventh voltage U1, the first controllable switch K7 is in an off state; if the second charging and discharging connection of the discharging vehicle 200 confirms that the detection point voltage is an eighth voltage R1/(R1+ R4) × U1, the first controllable switch K7 is in a closed state, and the first plug 110 is not connected to the discharging vehicle 200, wherein the eighth voltage is less than the seventh voltage; if the second charging and discharging connection confirmation detection point voltage of the discharging vehicle 200 is the ninth voltage, the first controllable switch K7 is in a closed state, the first plug 110 is connected to the discharging vehicle 200, wherein the ninth voltage is less than the eighth voltage; if the second charge-discharge connection confirmation detection point voltage of the discharging vehicle 200 is the tenth voltage, the first controllable switch K7 is in the closed state, the first plug 110 is connected to the discharging vehicle 200, and the second plug 120 is connected to the powered vehicle 300, where the tenth voltage is smaller than the ninth voltage. The second controllable switch K7' is always open during this process.

The first plug 110 and the second plug 120 are connected by a cable, and when the first plug 110 and the discharging vehicle 200 are in a connected state, the rated current of the cable can be determined according to the magnitude of the tenth voltage. In addition, compared to the case where the third resistor R6 and the seventh resistor R6 ' are directly connected in parallel, the difference between the eighth voltage and the ninth voltage can be made larger by providing the fourth resistor R7 and the eighth resistor R7 ' in series between the one end of the third resistor R6 and the one end of the seventh resistor R6 ', and the connection state between the first plug 110 and the discharging vehicle 200 can be recognized more easily. The tenth voltage is positively correlated with the rated current of the cable, the corresponding relation between the tenth voltage and the rated current of the cable can be stored in advance, the rated current of the cable can be determined based on the corresponding relation after the tenth voltage is obtained, and the rated current can be used as a charging and discharging control parameter to ensure the charging and discharging safety; in addition, different resistances of the fourth resistor R7 and the eighth resistor R7' can correspond to different tenth voltages, and therefore more cables can be adapted.

It should be noted that the determination process of the charge/discharge connection state of second plug 120 on the side of power receiving vehicle 300 is the same as the determination process of the charge/discharge connection state of first plug 110 on the side of discharging vehicle 200, and details thereof are not repeated.

Thus, when charging power receiving vehicle 300, charging and discharging connection between discharging vehicle 200 and power receiving vehicle 300 can be guided by charging and discharging connection device 100, and it is also possible to recognize charging and discharging connection state of first plug 110 on the discharging vehicle 200 side and charging and discharging connection state of second plug 120 on the power receiving vehicle 300 side, so as to ensure safety and reliability of charging and discharging.

Referring to fig. 2-5, a first electronic lock device 111 is disposed in the first plug 110, and a second electronic lock device 121 is disposed in the second plug 120.

In an embodiment of the present invention, referring to fig. 2, the power supply terminal of the first electronic lock device 111 is connected to the auxiliary power supply terminal of the first plug 110, the first electronic lock device 111 is further connected to the charge-discharge communication line in the first plug 110, so as to perform on-off control on the charge-discharge communication line in the first plug 110, and lock the first switch S1 when the charge-discharge communication line in the first plug 110 is turned on, wherein the auxiliary power supply terminal of the first plug 110 is used for connecting the auxiliary power supply 240 of the discharging vehicle 200 through the third controllable switch KA; the power supply terminal of the second electronic lock device 121 is connected to the auxiliary power supply terminal of the second plug 120, and the second electronic lock device 121 is further connected to the charge and discharge communication line in the second plug 120, so as to control the charge and discharge communication line in the second plug 120 to be on and off, and lock the second switch S1 'when the charge and discharge communication line in the second plug 120 is turned on, wherein the auxiliary power supply terminal of the second plug 120 is used for connecting the auxiliary power supply 340 of the power receiving vehicle 300 through the fourth controllable switch KA'.

The locking of the first switch S1 means that the mechanical button of the first plug 110 cannot be pressed, and the latch hook of the first plug 110 cannot be lifted and is engaged with the recess of the socket 210 of the discharging vehicle 200; accordingly, the locking of the second switch S1' means that the mechanical button of the second plug 120 cannot be pressed, and the latch hook of the second plug 120 cannot be lifted up but engages with the recess of the socket 310 of the powered vehicle 300.

In this embodiment, referring to fig. 3, the first electronic lock device 111 includes: a first power supply terminal 1111, a first state feedback unit 1112, and a first execution unit 1113. The first power supply terminal 1111 is connected to an auxiliary power supply terminal, i.e. a +, a-pin, of the first plug 110, wherein the auxiliary power supply terminal of the first plug 110 is used for connecting an auxiliary power supply 240 (e.g. a battery capable of providing 12V voltage) of the discharging vehicle 200 through the third controllable switch KA; the first state feedback unit 1112 is connected in series on the charge and discharge communication line in the first plug 110; the first executing unit 1113 is connected to the first power supply terminal 1111, and the first executing unit 1113 is configured to control the on/off of the charging/discharging communication line in the first plug 110 through the first state feedback unit 1112 according to whether the auxiliary power supply 240 (such as a storage battery capable of providing 12V voltage) of the discharging vehicle 200 supplies power to the auxiliary power terminal of the first plug 110.

Specifically, referring to fig. 3, it is the first power supply terminal 1111 of the first electronic locking device 111 that is connected to the a +, a-signal and to the first execution unit 1113; the first execution unit 1113 operates such that the connection between the first plug 110 and the receptacle 210 of the discharging vehicle 200 is in a locked state; the first state feedback unit 1112 may include a relay S2, and the relay S2 is connected in series to the charge and discharge communication line of the first plug 110. When the first executing unit 1113 operates, the third controllable switch KA (e.g., a relay) operates to turn off or turn on the charging/discharging communication line (e.g., a CAN communication line) in the first plug 110, so as to achieve the state feedback function.

Referring to fig. 3, the second electronic lock device 112 includes: a second power supply terminal 1121, a second state feedback unit 1122, and a second execution unit 1113. The second power supply terminal 1121 is connected to an auxiliary power supply terminal, i.e., a +, a-pin, of the second plug 120, wherein the auxiliary power supply terminal of the second plug 120 is used for connecting an auxiliary power supply 340 (e.g., a secondary battery capable of supplying 12V voltage) of the powered vehicle 300 through a fourth controllable switch KA'; the second state feedback unit 1122 is connected in series on the charge and discharge communication line in the second plug 120; second executing unit 1123 is connected to second power supply terminal 1121, and second executing unit 1123 is configured to control on/off of the charging/discharging communication line in second plug 120 through second state feedback unit 1122 according to whether auxiliary power supply 340 of powered vehicle 300 supplies power to the auxiliary power terminal of second plug 120.

Specifically, referring to fig. 3, it is the second power supply terminal 1121 of the second electronic locking device 112 that is connected to the a +, a-signal and to the second execution unit 1123; second execution unit 1123 operates such that the connection between second plug 120 and outlet 310 of powered vehicle 300 is in a locked state; the second state feedback unit 1122 may include a relay S2 ', and the relay S2' is connected in series to a charge and discharge communication line of the second plug 120. When the second executing unit 1123 is activated, the second controllable switch KA' (e.g., a relay) is activated to turn off or turn on the charging/discharging communication line in the second plug 120, so as to achieve the state feedback function.

In the embodiment shown in fig. 3, as a possible example, when vehicle control device 220 of discharging vehicle 200 determines that the charging and discharging connection state between first plug 110 and receptacle 210 of discharging vehicle 200 is in the fully connected state according to the first charging and discharging connection confirmation detection point of discharging vehicle 200, vehicle control device 220 controls third controllable switch KA to be closed, auxiliary power supply 240 supplies power to first power supply terminal 1111 and second power supply terminal 1121, respectively, first execution unit 1113 operates, relay S2 in first state feedback unit 1112 is closed, and the charging and discharging communication line in first plug 110 is communicated; second actuator 1123 operates, relay S2' in second state feedback unit 1122 is closed, and the charge/discharge communication line in second plug 120 is connected. At this time, vehicle Control device 220 may communicate with vehicle Control device 320 of power-receiving vehicle 300 (for example, CAN (Control Area Network) communication), and vehicle Control device 220 may acquire the charge/discharge connection state between second plug 120 and outlet 310 of power-receiving vehicle 300, which is determined by vehicle Control device 320 from the first charge/discharge connection confirmation detection point of power-receiving vehicle 300. If the second plug 120 and the socket 310 are in a fully connected state, the vehicle control device 320 may control the third controllable switch KA' to be closed, so as to further ensure the locking of the first electronic lock device 111 and the second electronic lock device 112, and further, the

vehicle control device

220, 320 may perform charge and discharge control, thereby ensuring the safety of the charging connection and the charging process. If the second plug 120 and the socket 310 are not in the complete connection state, the vehicle control device 220 may control the third controllable switch KA to be turned off, so that the first electronic lock device 111 and the second electronic lock device 112 are unlocked; when the second plug 120 and the socket 310 are in a complete connection state, the vehicle control device 320 may control the fourth controllable switch KA' to be closed, so that the first electronic lock device 111 and the second electronic lock device 112 are locked again, at this time, the vehicle control device 220 may control the first controllable switch to be closed again, so that the discharging vehicle 200 and the CAN loop of the powered vehicle 300 are reliably conducted, and then, the interaction may be performed according to a national standard dc charging process.

When the discharging is finished (for example, the power receiving vehicle 300 actively stops or the discharging vehicle 200 finishes charging), the vehicle control device 220 of the discharging vehicle 200 turns off the switches K5 and K6 after detecting that the current of DC +/DC-is less than a certain value, for example, 5A, and then the vehicle control device 220 controls the relay KA to be turned off, so that the power supply of the first electronic locking device 111 on the a +/a-loop is turned off, the relay S2 of the first electronic locking device 111 is turned off, the discharging vehicle 200 is turned off from the CAN loop of the power receiving vehicle 300, the discharging process is finished, the vehicle control device 320 controls KA 'to be turned off, the a +/a-loop of the second electronic locking device 121 loses power, and the relay S2' is turned off, so that the first plug 110 and the second plug 120 CAN be unplugged.

When the discharging vehicle 200 discharges the power-receiving vehicle 300, the vehicle control device 220 and the vehicle control device 320 control KA and KA 'to pull in and maintain power supply to the first electronic locking device 111 and the second electronic locking device 121, the electronic locking device relays S2 and S2' are closed, the mechanical buttons of the discharging plug and the charging plug cannot be pressed at the moment, and the locking hook of the vehicle plug cannot be lifted up and is engaged with the groove of the vehicle socket, so that reliable connection between the first plug 110 and the socket 210 and reliable connection between the second plug 120 and the socket 310 are ensured, and safety of a charging process is ensured.

In the embodiment shown in fig. 3, as another possible example, the vehicle control device 320 of the powered vehicle 300 may first determine that the second plug 120 and the socket 310 are in the fully connected state, and first trigger the first electronic lock device 111 and the second electronic lock device 112 to be locked by the vehicle control device 320. The specific procedure is the same as in the above example.

Thus, when charging power receiving vehicle 300, charge/discharge connection between discharging vehicle 200 and power receiving vehicle 300 is guided by charge/discharge connection device 100, and it is possible to recognize the charge/discharge connection state of first plug 110 on the discharging vehicle 200 side and the charge/discharge connection state of second plug 120 on the power receiving vehicle 300 side; and when the first plug 110 and the second plug 120 are both in the fully connected state, the electronic locks in the first plug 110 and the second plug 120 are controlled to be locked on the discharging vehicle 200 side and/or the receiving vehicle 300 side to lock the fully connected state, so as to prevent the charging and discharging connection device 100 from being pulled out of the vehicle under the unsafe condition, thereby well ensuring the charging and discharging connection state and ensuring the charging and discharging safety and reliability.

In another embodiment of the present invention, referring to fig. 4, a thirteenth resistor R8 and a first electronic locking device 111 are further disposed in the first plug 110, and a fourteenth resistor R8' and a second electronic locking device 121 are further disposed in the second plug 120. Referring to fig. 4, the other end of the second resistor R5 is connected to the first connection confirmation terminal of the first plug 110 through a thirteenth resistor R8; the power supply terminal of the first electronic lock device 111 is connected to the auxiliary power supply terminal of the first plug 110, and the first electronic lock device 111 is further connected to both terminals of a thirteenth resistor R8 for controlling whether the thirteenth resistor R8 is short-circuited or not and for locking the first switch S1 when the thirteenth resistor R8 is short-circuited, wherein the auxiliary power supply terminal of the first plug 110 is used for connecting the auxiliary power supply 240 of the discharging vehicle 200 through the third controllable switch KA. The other end of the sixth resistor R5 'is connected to the first connection confirmation terminal of the second plug 120 through a fourteenth resistor R8'; the power supply terminal of the second electronic lock device 121 is connected to the auxiliary power supply terminal of the second plug 120, and the second electronic lock device 121 is further connected to two terminals of a fourteenth resistor R8 ' for controlling whether the fourteenth resistor R8 ' is short-circuited or not and for locking the second switch S1 ' when the fourteenth resistor R8 ' is short-circuited, wherein the auxiliary power supply terminal of the second plug 120 is used for connecting the auxiliary power supply 340 of the power receiving vehicle 300 through the fourth controllable switch KA '.

Note that, in this embodiment, the first switch S1 and the second switch S1' are locked in the same manner as the locking process in the above-described embodiment.

In this embodiment, referring to fig. 5, the first electronic lock device 111 includes: a first power supply terminal 1111, a first state feedback unit 1112, and a first execution unit 1113. The first power supply terminal 1111 is connected to an auxiliary power supply terminal, i.e. a +, a-pin, of the first plug 110, wherein the auxiliary power supply terminal of the first plug 110 is used for connecting an auxiliary power supply 240 (e.g. a battery capable of providing 12V voltage) of the discharging vehicle 200 through the third controllable switch KA; the first state feedback unit 1112 is connected to two ends of the thirteenth resistor R8; the first executing unit 1113 is connected to the first power supply terminal 1111, and the first executing unit 1113 is configured to control whether the thirteenth resistor R8 is short-circuited or not through the first status feedback unit 1112 according to whether the auxiliary power supply 240 (e.g., a storage battery capable of providing 12V) of the discharging vehicle 200 supplies power to the auxiliary power terminal of the first plug 110 or not.

Specifically, referring to fig. 5, it is the first power supply terminal 1111 of the first electronic locking device 111 that is connected to the a +, a-signal and to the first execution unit 1113; the first execution unit 1113 operates such that the connection between the first plug 110 and the receptacle 210 of the discharging vehicle 200 is in a locked state; the first state feedback unit 1112 may include a relay S2, the relay S2 being connected in parallel with a thirteenth resistor R8. When the first actuator 1113 is actuated, the third controllable switch KA (e.g., a relay) is actuated to make the thirteenth resistor R8 short-circuited or not, thereby achieving the state feedback function.

Referring to fig. 5, the second electronic lock device 112 includes: a second power supply terminal 1121, a second state feedback unit 1122, and a second execution unit 1113. The second power supply terminal 1121 is connected to an auxiliary power supply terminal, i.e., a +, a-pin, of the second plug 120, wherein the auxiliary power supply terminal of the second plug 120 is used for connecting an auxiliary power supply 340 (e.g., a secondary battery capable of supplying 12V voltage) of the powered vehicle 300 through a fourth controllable switch KA'; the second state feedback unit 1122 is connected to two ends of the fourteenth resistor R8'; the second executing unit 1123 is connected to the second power supply terminal 1121, and the second executing unit 1123 is configured to control whether the fourteenth resistor R8' is short-circuited or not through the second state feedback unit 1122 according to whether the auxiliary power supply 340 of the power receiving vehicle 300 supplies power to the auxiliary power terminal of the second plug 120 or not.

Specifically, referring to fig. 5, it is the second power supply terminal 1121 of the second electronic locking device 112 that is connected to the a +, a-signal and to the second execution unit 1123; second execution unit 1123 operates such that the connection between second plug 120 and outlet 310 of powered vehicle 300 is in a locked state; the second state feedback unit 1122 may include a relay S2 ', the relay S2 ' being connected in parallel with a fourteenth resistor R8 '. When the second execution unit 1123 is activated, the second controllable switch KA '(e.g., a relay) is activated to make the fourteenth resistor R8' short-circuited or not, thereby achieving the state feedback function.

In the embodiment shown in fig. 5, when the first plug 110 is inserted into the discharging vehicle 200, the second plug 120 is inserted into the charging vehicle 300, and both are in the fully connected state, and the first electronic locking device 111 and the second electronic locking device 121 are in the unlocked state, the voltage at the detection point 2 of the discharging vehicle 200 is (R5+ R8)/(R2+ R5+ R8) × U2, and the voltage at the detection point 2 ' of the receiving vehicle 300 is (R5 ' + R8 ')/(R2 ' + R5 ' + R8 ') × U2 '; when both the plug and the receptacle are in the half-connected state (i.e., the first switch S1 and the second switch S1 'are turned off), and the first electronic locking device 111 and the second electronic locking device 121 are in the unlocked state, the voltage at the detection point 2 of the discharging vehicle 200 is (R5+ R8+ R3)/(R2+ R5+ R8+ R3) × U2, and the voltage at the detection point 2' of the powered vehicle 300 is (R5 '+ R8' + R3 ')/(R2' + R5 '+ R8' + R3 ') × U2'; when both plugs and the outlets are in the fully connected state, and the first electronic locking device 111 and the second electronic locking device 121 are in the locked state, the voltage at the detection point 2 of the discharging vehicle 200 is R5/(R2+ R5) × U2, and the voltage at the detection point 2 ' of the receiving vehicle 300 is R5 '/(R2 ' + R5 ')/U2 '.

It can be seen that when the first electronic locking device 111 or the second electronic locking device 121 is in the unlocked state, the voltages at the detection point 2 or the detection point 2 'are different, and the vehicle control device 220 or the vehicle control device 320 recognizes that the voltage at the detection point 2 or the detection point 2' is the non-charging and discharging allowable voltage, then no interaction is performed in the charging and discharging process. Only when the two plugs are completely connected with the corresponding sockets and the electronic locking device is successfully locked, the interaction of the charging and discharging processes can be realized, and the safety of the charging connection and the charging process is ensured.

Specifically, when determining that the charge-discharge connection state between first plug 110 and receptacle 210 of discharging vehicle 200 is in the fully connected state from the first charge-discharge connection confirmation detection point of discharging vehicle 200, vehicle control device 220 of discharging vehicle 200 transmits interactive information to vehicle control device 320 of receiving vehicle 300 so that vehicle control device 320 knows that the charge-discharge connection state between first plug 110 and receptacle 210 of discharging vehicle 200 is in the fully connected state. At this time, if vehicle control device 320 of power receiving vehicle 300 determines that the charge/discharge connection state between second plug 120 and receptacle 310 of power receiving vehicle 300 is in the fully connected state at the first charge/discharge connection confirmation detection point of power receiving vehicle 300, vehicle control device 320 controls fourth controllable switch KA' to be closed, auxiliary power supply 340 supplies power to first power supply terminal 1111 and second power supply terminal 1121, respectively, first execution unit 1113 operates, relay S2 in first state feedback unit 1112 is closed, and thirteenth resistor R8 is short-circuited; the second actuator 1123 is activated, the relay S2 'of the second state feedback unit 1122 is closed, and the fourteenth resistor R8' is short-circuited. Meanwhile, the vehicle control device 320 may further transmit the complete connection state information between the second plug 120 and the socket 310 of the powered vehicle 300 to the vehicle control device 220 of the discharging vehicle 200, the vehicle control device 220 controls the third controllable switch KA to be closed, and the auxiliary power source 240 also supplies power to the first power supply terminal 1111 and the second power supply terminal 1121, respectively, so as to ensure reliable short circuit of the thirteenth resistor R8 and the fourteenth resistor R8' by the first electronic lock device 111 and the second electronic lock device 112. Therefore, the safety of charging connection and charging process is ensured.

In conclusion, through the utility model discloses charge and discharge control device, when discharging vehicle 200 charges to receiving vehicle 300, not only can guide the charge and discharge connection between discharging vehicle 200 and the receiving vehicle 300, still can realize discerning multiple charge and discharge connection state in discharging vehicle 200 side and/or receiving vehicle 300 side to carry out corresponding control to electronic lock device according to charge and discharge connection state, and then security and the reliability of assurance charge and discharge that can be better.

Fig. 6 is a block diagram of an electric vehicle according to an embodiment of the present invention.

As shown in fig. 6, the electric vehicle 1000 includes: socket 1100, first detection unit 1200, second detection unit 1300, and vehicle control device 1400.

The socket 1100 is used for connecting the first plug 110 or the second plug 120 in the charging and discharging connection device 100 of the above embodiment; the first detection unit 1200 and the second detection unit 1300 are respectively connected to the receptacle 1100, the first detection unit 1200 is configured to detect a connection state between the receptacle 1100 and the first plug 110 or the second plug 120 to generate a first detection signal, and the second detection unit 1300 is configured to detect a connection state between the receptacle 1100 and the charge and discharge device to generate a second detection signal; the vehicle control device 1400 is connected to the first detection unit 1200 and the second detection unit 1300, respectively, and the vehicle control device 1400 is configured to perform charge and discharge control on the electric vehicle 1000 according to the first detection signal and the second detection signal.

Referring to fig. 6, the first sensing unit 1200 includes a first sensing point J1, the first sensing point J1 is connected to the vehicle control apparatus 100 and to the CC2 pin of the outlet 1100, and the first sensing point J1 is further connected to a first preset power source U2 through a first pull-up resistor Rs 1.

Referring to fig. 6, a sensing resistor Rc may be disposed in the socket 1100, one end of the sensing resistor Rc is connected to a body ground of the electric vehicle 1000, and the other end of the sensing resistor Rc is connected to a CC1 pin of the socket 1100, wherein the second sensing unit 1300 includes a second sensing point J2, the second sensing point J2 is connected to the vehicle control device 1400 and is connected to the other end of the sensing resistor Rc through a first controllable switch K7, and the second sensing point J2 is further connected to a second preset power source U1 through a second pull-up resistor Rs 2.

Referring to fig. 7, the electric vehicle 1000 may further include: the auxiliary power supply 1500 is connected to the auxiliary power terminal of the socket 1100 through a third controllable switch KA, wherein the vehicle control device 1400 is further connected to a control terminal of the third controllable switch KA for controlling on/off of the third controllable switch KA.

The utility model discloses electric vehicle can realize whether connecting and the connection status discerns to outside charge-discharge equipment to and the control of electronic lock device among the charge-discharge connecting device, and then can improve electric vehicle charge-discharge's security and reliability.

Fig. 8 is a block diagram of a charge/discharge system according to an embodiment of the present invention.

As shown in fig. 8, the charge/discharge system 2000 includes the charge/discharge connection device 100 of the above-described embodiment, and two electric vehicles 1000 of the above-described embodiments, which are respectively referred to as a discharge vehicle 200 and a power receiving vehicle 300.

Referring to fig. 8, the charge-discharge connection device 100 is connected between the discharging vehicle 200 and the power receiving vehicle 300 in order to achieve safe and reliable charge-discharge control of V2V.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A charging and discharging connection device, comprising: the plug comprises a first plug and a second plug, wherein the first plug is internally provided with a first resistor, a second resistor, a third resistor, a fourth resistor and a first switch, the second plug is internally provided with a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second switch,

one end of the first resistor is connected to a ground terminal of the first plug, wherein the ground terminal of the first plug is used for connecting a body ground of a discharge vehicle;

one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected to a first connection confirmation terminal of the first plug, wherein the first connection confirmation terminal of the first plug is used for connecting a first connection confirmation terminal of the discharging vehicle;

the first switch is connected with the first resistor in parallel;

one end of the third resistor is connected to the ground terminal of the first plug, and the other end of the third resistor is connected to the second connection confirmation terminal of the first plug, wherein the second connection confirmation terminal of the first plug is used for connecting the second connection confirmation terminal of the discharging vehicle through the first controllable switch;

one end of the fourth resistor is connected to a second connection confirmation terminal of the first plug;

one end of the fifth resistor is connected to a ground terminal of the second plug, wherein the ground terminal of the second plug is used for connecting a body ground of a power receiving vehicle;

one end of the sixth resistor is connected to the other end of the fifth resistor, and the other end of the sixth resistor is connected to a first connection confirmation terminal of the second plug, where the first connection confirmation terminal of the second plug is used to connect to a first connection confirmation terminal of the power receiving vehicle;

the second switch is connected with the fifth resistor in parallel;

one end of the seventh resistor is connected to the ground terminal of the second plug, and the other end of the seventh resistor is connected to a second connection confirmation terminal of the second plug, which is used for connecting the second connection confirmation terminal of the power receiving vehicle through a second controllable switch;

one end of the eighth resistor is connected to the second connection confirmation terminal of the second plug, and the other end of the eighth resistor is connected to the other end of the fourth resistor;

the first plug and the second plug are connected through a cable, and when the first plug and the discharging vehicle are in a connected state and the second plug and the power receiving vehicle are in a connected state, the rated current of the cable is determined according to the voltage of a second connection confirmation terminal of the discharging vehicle.

2. The charge-discharge connection device according to claim 1, wherein a first electronic locking means is further provided in said first plug, and a second electronic locking means is further provided in said second plug, wherein,

the power supply end of the first electronic lock device is connected to an auxiliary power supply terminal of the first plug, the first electronic lock device is further connected with a charging and discharging communication line in the first plug so as to control the charging and discharging communication line in the first plug to be on and off, and the first switch is locked when the charging and discharging communication line in the first plug is conducted, wherein the auxiliary power supply terminal of the first plug is used for being connected with an auxiliary power supply of the discharging vehicle through a third controllable switch;

the power supply end of the second electronic lock device is connected to an auxiliary power supply terminal of the second plug, the second electronic lock device is further connected with a charging and discharging communication line in the second plug so as to control the charging and discharging communication line in the second plug to be on and off, and the second switch is locked when the charging and discharging communication line in the second plug is enabled to be on, wherein the auxiliary power supply terminal of the second plug is used for being connected with an auxiliary power supply of the power receiving vehicle through a fourth controllable switch.

3. The charge-discharge connection device according to claim 2,

the first electronic lock device comprises:

a first power supply terminal connected to an auxiliary power supply terminal of the first plug;

the first state feedback unit is connected in series on a charging and discharging communication line in the first plug;

the first execution unit is connected with the first power supply terminal and used for controlling the on-off of a charging and discharging communication line in the first plug through the first state feedback unit according to whether an auxiliary power supply of the discharging vehicle supplies power to an auxiliary power supply terminal of the first plug or not;

the second electronic lock device includes:

a second power supply terminal connected to an auxiliary power supply terminal of the second plug;

the second state feedback unit is connected in series on a charging and discharging communication line in the second plug;

and the second execution unit is connected with the second power supply terminal, and is used for controlling the on-off of the charging and discharging communication line in the second plug through the second state feedback unit according to whether the auxiliary power supply of the power-receiving vehicle supplies power to the auxiliary power supply terminal of the second plug or not.

4. The charging and discharging connection device according to claim 1, wherein a thirteenth resistor and a first electronic locking device are further provided in the first plug, and a fourteenth resistor and a second electronic locking device are further provided in the second plug, wherein,

the other end of the second resistor is connected to a first connection confirmation terminal of the first plug through the thirteenth resistor;

the power supply end of the first electronic lock device is connected to an auxiliary power supply terminal of the first plug, the first electronic lock device is further connected with two ends of the thirteenth resistor so as to control whether the thirteenth resistor is short-circuited or not, and the first switch is locked when the thirteenth resistor is short-circuited;

the other end of the sixth resistor is connected to the first connection confirmation terminal of the second plug through the fourteenth resistor;

the power supply end of the second electronic lock device is connected to the auxiliary power supply terminal of the second plug, and the second electronic lock device is further connected to two ends of the fourteenth resistor so as to control whether the fourteenth resistor is short-circuited or not and lock the second switch when the fourteenth resistor is short-circuited.

5. The charging and discharging connection device according to claim 4, wherein the first electronic lock device comprises:

a first state feedback unit connected in parallel with the thirteenth resistor;

the first execution unit is connected with the first power supply terminal and used for controlling whether the thirteenth resistor is short-circuited or not through the first state feedback unit according to whether the auxiliary power supply of the discharging vehicle supplies power to the auxiliary power supply terminal of the first plug or not;

a second state feedback unit connected in parallel with the fourteenth resistor;

and a second execution unit connected to the second power supply terminal, the second execution unit being configured to control whether the fourteenth resistor is short-circuited or not through the second state feedback unit according to whether the auxiliary power supply of the powered vehicle supplies power to the auxiliary power supply terminal of the second plug or not.

6. The charging and discharging connection device according to claim 3 or 5, wherein the first state feedback unit includes a first relay, and the second state feedback unit includes a second relay.

7. An electric vehicle, characterized by comprising:

a receptacle for connecting a first plug or a second plug in the charge and discharge connection device according to any one of claims 1 to 6;

the first detection unit and the second detection unit are respectively connected with the socket, the first detection unit is used for detecting the connection state between the socket and the first plug or the second plug so as to generate a first detection signal, and the second detection unit is used for detecting the connection state between the socket and the charge and discharge equipment so as to generate a second detection signal;

the vehicle control device is respectively connected with the first detection unit and the second detection unit and is used for carrying out charge and discharge control on the electric vehicle according to the first detection signal and the second detection signal.

8. The electric vehicle as claimed in claim 7, wherein the first sensing unit includes a first sensing point connected to the vehicle control device and to a CC2 pin of the outlet, the first sensing point being further connected to a first preset power source through a first pull-up resistor.

9. The electric vehicle as claimed in claim 8, wherein a detection resistor is provided in the socket, one end of the detection resistor is connected to a body ground of the electric vehicle, and the other end of the detection resistor is connected to a CC1 pin of the socket, wherein the second detection unit includes a second detection point, the second detection point is connected to the vehicle control device and to the other end of the detection resistor through a first controllable switch, and the second detection point is further connected to a second preset power supply through a second pull-up resistor.

10. The electric vehicle of claim 7, characterized in that the electric vehicle further comprises:

and the auxiliary power supply is connected with the auxiliary power supply terminal of the socket through a third controllable switch, and the vehicle control device is also connected with the control end of the third controllable switch.

11. A charging and discharging system, comprising:

two electric vehicles according to any one of claims 7 to 10, respectively denoted as a discharging vehicle and a receiving vehicle;

the charge-discharge connection device according to any one of claims 1 to 6;

wherein the charge/discharge connection device is connected between the discharging vehicle and the power receiving vehicle.