Charging / discharging device, charging / discharging system, and charging / discharging method

Abstract

A charging / discharging device (300), comprising resistance conversion circuits (320), connection confirm (CC) interfaces (312), and alternating current interfaces (311). One end of each resistance conversion circuit is grounded, and the other end of the resistance conversion circuit is connected to a CC interface; the CC interface and the alternating current interface are both used for connection to an electric vehicle (400); the resistance conversion circuit comprises a plurality of switches and a plurality of resistors; the plurality of switches are used for adjusting an equivalent resistance value of the resistance conversion circuit; the equivalent resistance value of the resistance conversion circuit is used for the electric vehicle to output an alternating current to the alternating current interface or used for the electric vehicle to receive an alternating current output by the alternating current interface. Also disclosed are a charging / discharging system and a charging / discharging method. By means of the charging / discharging device, the charging function and the discharging function of electric vehicles can be achieved, the charging and discharging operations are simple, and the device cost is low.

Description

Charging and discharging device, charging and discharging system, and charging and discharging method

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on November 15, 2023, with application number 202311522943.6, and priority to the Chinese patent application with the invention name “Charging and Discharging Equipment, Charging and Discharging System, and Charging and Discharging Method”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of charging, and more particularly, to a charging and discharging device, a charging and discharging system, and a charging and discharging method. Background Art

[0003] With the rapid adoption of electric vehicles, they are no longer simply a means of transportation. To alleviate pressure on the power grid and generate revenue for users, electric vehicles are beginning to incorporate discharge capabilities in addition to charging. For example, some electric vehicles are now equipped with vehicle-to-grid (V2G) and vehicle-to-vehicle (V2V) discharge capabilities, allowing them to sell electricity to the grid or other electric vehicles.

[0004] However, in current practical applications, charging piles generally only have the single function of charging electric vehicles, and cannot better meet the needs of electric vehicles for both charging and discharging functions.

[0005] Summary of the Invention

[0006] The present application provides a charging and discharging device, a charging and discharging system and a charging and discharging method. The charging and discharging device can realize both the charging function and the discharging function of an electric vehicle, and the charging and discharging operation is relatively simple and the equipment cost is low.

[0007] In a first aspect, a charging and discharging device is provided. The charging and discharging device includes a resistance conversion circuit, a connection confirmation interface (CC interface), and an AC interface. One end of the resistance conversion circuit is grounded, and the other end of the resistance conversion circuit is connected to the CC interface. The CC interface and the AC interface are used to connect to an electric vehicle. The resistance conversion circuit includes multiple switches and multiple resistors. The multiple switches are used to adjust the equivalent resistance value of the resistance conversion circuit. The equivalent resistance value of the resistance conversion circuit is used by the electric vehicle to output AC power to the AC interface, or by the electric vehicle to receive AC power output by the AC interface.

[0008] It is understandable that, since one end of the resistance conversion circuit is grounded and the other end is connected to the CC interface, the equivalent resistance value of the resistance conversion circuit may also refer to the resistance value of the CC interface.

[0009] It should also be understood that in the embodiments of the present application, the charging and discharging device corresponds to the charging and discharging modes of the electric vehicle through the equivalent resistance values ​​of the resistance conversion circuit of different sizes, that is, through the resistance values ​​of the CC interface of different sizes. Specifically, the equivalent resistance value of the resistance conversion circuit used by the electric vehicle to receive AC power output from the AC interface can correspond to the charging mode of the electric vehicle. In this case, the electric vehicle can determine the charging mode by detecting the resistance value of the CC interface. The equivalent resistance value of the resistance conversion circuit used by the electric vehicle to output AC power to the AC interface can correspond to the discharging mode of the electric vehicle. In this case, the electric vehicle can determine the discharging mode by detecting the resistance value of the CC interface.

[0010] In the above technical solution, the resistance conversion circuit connected to the CC interface is equipped with multiple switches and resistors. The charging and discharging device can adjust the resistance value of the CC interface by controlling the on / off states of the multiple switches. Thus, different CC interface resistance values ​​correspond to the charging and discharging modes of the electric vehicle. In this way, the electric vehicle can determine the charging and discharging mode by detecting the resistance value of the connected CC interface, and then realize the charging and discharging functions through the charging and discharging device.

[0011] Furthermore, in the embodiments of the present application, the charging and discharging device can be directly provided with a charging and discharging gun, with the CC interface and AC interface configured as the CC plug and AC plug of the charging and discharging gun plug. Thus, compared to electric vehicles using a charging gun device for charging and a discharging gun device for discharging, the charging and discharging device provided in the embodiments of the present application can avoid the need for equipment replacement during charging and discharging, simplifying the charging and discharging operations of the electric vehicle. Furthermore, the charging and discharging device provided in the embodiments of the present application does not require the simultaneous configuration of a charging gun device and a discharging gun device, which not only reduces the cost of the charging and discharging device, but also reduces the size of the charging and discharging device, making it easier to carry the charging and discharging device on the vehicle.

[0012] In conjunction with the first aspect, in certain implementations of the first aspect, the charging and discharging device further includes a controller, which is further configured to: in response to a charging request or a discharging request from the electric vehicle, control the on / off states of multiple switches in the resistance conversion circuit to adjust the equivalent resistance value of the resistance conversion circuit to any one of a charging resistance value, a vehicle-to-grid (V2G) discharge resistance value, a vehicle-to-vehicle (V2V) discharge resistance value, and a vehicle-to-load (V2L) discharge resistance value. The charging resistance value is used by the electric vehicle to receive AC power output from the AC interface; the V2G discharge resistance value is used by the electric vehicle to output AC power to the AC interface via a V2G discharge mode; the V2V discharge resistance value is used by the electric vehicle to output AC power to the AC interface via a V2V discharge mode; and the V2L discharge resistance value is used by the electric vehicle to output AC power to the AC interface via a V2L discharge mode.

[0013] In the above technical solution, the charging and discharging device can adjust the equivalent resistance value of the resistance conversion circuit connected to the CC interface based on the charging request or discharging request of the electric vehicle, so that the electric vehicle can determine to execute the corresponding charging and discharging mode by detecting the resistance value of the CC interface. In addition, electric vehicles usually implement different discharge functions by implementing different discharge modes. For example, when an electric vehicle needs to discharge to other electric vehicles to implement the V2V discharge function, the electric vehicle usually outputs AC power by implementing the V2V discharge mode. In the embodiment of the present application, even if the electric vehicle does not have a V2V discharge mode, the charging and discharging device can adjust the resistance value of the CC interface to a V2L discharge resistance value, so that the electric vehicle can output AC power to the AC interface based on the V2L discharge mode. The charging and discharging device can further transmit the AC power output by the electric vehicle based on the V2L discharge mode to other connected electric vehicles to implement the V2V discharge function of the electric vehicle.

[0014] In conjunction with the first aspect, in certain implementations of the first aspect, the charging and discharging device further includes a switch unit and a control-guided CP interface. The other end of the resistance conversion circuit is connected to the CC interface via the switch unit, and the CP interface is used to connect to the electric vehicle. The controller is further configured to: when the AC interface, CC interface, and CP interface are connected to the electric vehicle, adjust the equivalent resistance value of the resistance conversion circuit; control the switch unit to disconnect the other end of the resistance conversion circuit from the CC interface; and, in response to a change in the voltage value of the CP interface, control the switch unit to connect the other end of the resistance conversion circuit to the CC interface, so that the electric vehicle detects the adjusted equivalent resistance value of the resistance conversion circuit via the CC interface.

[0015] It is understandable that in the embodiment of the present application, when the resistance value of the CC interface is adjusted from the first resistance value to the second resistance value, the electric vehicle can usually only detect the second resistance value when the resistance value of the CC interface changes from infinity to the second resistance value.

[0016] In the above technical solution, when an electric vehicle is already connected to a charging and discharging device and the electric vehicle needs to change the charging and discharging mode executed by the charging and discharging device, the charging and discharging device can first adjust the equivalent resistance value of the resistance conversion circuit to the resistance value corresponding to the changed charging and discharging mode, and then disconnect the connection between the resistance conversion circuit and the CC interface via a switch unit, so that the resistance value of the CC interface is infinite. When the charging and discharging device determines that the electric vehicle has detected that the resistance value of the CC interface is infinite based on a change in the voltage of the CP interface, the charging and discharging device reconnects the connection between the resistance conversion circuit and the CC interface via the switch unit, so that the resistance value of the CC interface changes from infinite to the equivalent resistance value of the adjusted resistance conversion circuit. In this way, after the connection between the resistance conversion circuit and the CC interface is reconnected, based on the process in which the resistance value of the CC interface changes from infinite to the equivalent resistance value of the adjusted resistance conversion circuit, the electric vehicle can detect the resistance value of the CC interface, that is, the adjusted equivalent resistance value of the resistance conversion circuit, and implement the change of the charging and discharging mode based on the adjusted equivalent resistance value of the resistance conversion circuit.

[0017] In conjunction with the first aspect, in certain implementations of the first aspect, the charging and discharging device further includes a connection confirmation circuit, the connection confirmation circuit being connected to the CP interface, and the connection confirmation circuit being configured to adjust the voltage value of the CP interface. The controller is configured to, in response to a change in the voltage value of the CP interface, control the switch unit to conduct a connection between the other end of the resistance conversion circuit and the CC interface, so that the electric vehicle detects the adjusted equivalent resistance value of the resistance conversion circuit through the CC interface. The controller includes the following steps: the controller is configured to: in response to detecting a change in the voltage value of the CP interface, control the connection confirmation circuit to adjust the voltage value of the CP interface, so that the electric vehicle determines the adjusted equivalent resistance value of the resistance conversion circuit detected through the CC interface based on the voltage value of the CP interface; and control the switch unit to conduct a connection between the other end of the resistance conversion circuit and the CC interface, so that the electric vehicle detects the adjusted equivalent resistance value of the resistance conversion circuit through the CC interface.

[0018] In the above technical solution, when an electric vehicle is already connected to a charging and discharging device and the electric vehicle needs to change the charging and discharging mode executed by the charging and discharging device, after the charging and discharging device determines that the electric vehicle has detected an infinite resistance value at the CC interface based on a change in the voltage at the CP interface, the charging and discharging device can first adjust the voltage value at the CP interface via a connection confirmation circuit to simulate the process of disconnecting and reconnecting the CP interface and the electric vehicle, thereby simulating the process of removing and reinserting a charging and discharging gun from the electric vehicle. The charging and discharging device then reconnects the connection between the resistance conversion circuit and the CC interface via a switch unit, causing the resistance value of the CC interface to change from infinite to the equivalent resistance value of the adjusted resistance conversion circuit. In this way, the electric vehicle can re-detect the resistance value of the CC interface based on the simulated reinsertion of the charging and discharging gun, i.e., detect the adjusted equivalent resistance value of the resistance conversion circuit, and change the charging and discharging mode based on the adjusted equivalent resistance value of the resistance conversion circuit after the connection between the resistance conversion circuit and the CC interface is re-established.

[0019] Furthermore, the above technical solution simulates the disconnection and reconnection between the CP interface and the electric vehicle to simulate the process of unplugging and reinserting the charging and discharging gun from the electric vehicle. This helps to avoid the situation where, when the switch unit disconnects the connection between the resistance conversion circuit and the CC interface, the electric vehicle mistakenly believes that the connection between the CC interface and the electric vehicle has failed, and thus stops detecting the resistance value of the CC interface.

[0020] In conjunction with the first aspect, in certain implementations of the first aspect, the connection confirmation circuit includes a first switch, a first resistor, and a voltage source. One end of the first switch is connected to the voltage source, and the other end of the first switch is connected to the CP interface via the first resistor. A controller is configured to, in response to detecting a change in the voltage value of the CP interface, control the connection confirmation circuit to adjust the voltage value of the CP interface, including: In response to detecting a change in the voltage value of the CP interface, the controller is configured to control the first switch to open and then close to adjust the voltage value of the CP interface.

[0021] In the above technical solution, the voltage source of the connection confirmation circuit is connected to the CP interface via a first switch and a first resistor. When the first switch is open, the connection between the voltage source and the CP interface is disconnected, and the voltage value at the CP interface is zero, thereby simulating a disconnection between the CP interface and the electric vehicle. When the first switch is closed, the connection between the voltage source and the CP interface is established, and the voltage value at the CP interface is non-zero, thereby simulating a disconnection between the CP interface and the electric vehicle. Therefore, the charging and discharging device can simulate the process of disconnection and reconnection between the CP interface and the electric vehicle by controlling the opening and closing of the first switch.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the charging and discharging device further includes a power transmission line, which is used to: transmit AC power from the AC power grid to the electric vehicle connected to the AC interface; or, transmit AC power output by the electric vehicle received by the AC interface to the AC power grid; or, transmit AC power output by the electric vehicle received by the AC interface to other electric vehicles connected to the charging and discharging device.

[0023] In the above technical solution, the charging and discharging equipment can achieve power transmission between the AC grid and electric vehicles, as well as between electric vehicles and other electric vehicles, through the provided power transmission lines. This allows electric vehicles to perform charging functions, V2G discharge functions, and V2V discharge functions through the charging and discharging equipment, meeting the charging and discharging needs of electric vehicles in different scenarios. Furthermore, electric vehicles can receive relatively cheap off-peak electricity from the AC grid through the power transmission lines at night, and provide cheaper electricity than peak electricity to other electric vehicles that need charging during the day. This helps discharge vehicle owners earn additional income, reduces charging costs for charging vehicle owners, and alleviates pressure on the power grid.

[0024] Furthermore, because the charging and discharging equipment transmits AC power between the AC grid and electric vehicles, as well as between electric vehicles and other electric vehicles, there is no need for a power conversion device to convert AC power to DC power. This reduces the size of the charging and discharging equipment, making it easier to carry it on vehicles. This allows electric vehicles to provide power to other electric vehicles at any time through the charging and discharging equipment in different scenarios, thereby generating corresponding benefits.

[0025] In conjunction with the first aspect, in certain implementations of the first aspect, the charging and discharging device further includes an AC interface-side meter. The AC interface-side meter is used to measure the amount of AC power received by the AC interface from the electric vehicle, or to measure the amount of AC power output by the AC interface to the electric vehicle.

[0026] In the above technical solution, the charging and discharging equipment can measure the amount of electricity transmitted by the electric vehicle to the AC power grid and other electric vehicles through the AC interface side meter set up when the electric vehicle realizes the V2G discharge function and the V2V discharge function through the charging and discharging equipment, so as to obtain corresponding benefits.

[0027] In combination with the first aspect, in certain implementations of the first aspect, the controller is further configured to: when the AC interface receives AC power output by the electric vehicle through a V2L mode or a V2V mode, and the charging and discharging device outputs AC power to other connected electric vehicles, in response to the AC power output by the electric vehicle received by the AC interface being less than the charging power required by the other electric vehicles, control the AC power from the AC power grid and the AC power received by the AC interface to be transmitted to the other electric vehicles through a power transmission line; or, in response to the AC power output by the electric vehicle received by the AC interface being greater than the charging power required by the other electric vehicles, control the AC power received by the AC interface to be transmitted to the AC power grid and the other electric vehicles through a power transmission line.

[0028] In the above technical solution, when the charging and discharging equipment is connected to the AC power grid, and the electric vehicle provides electric energy to other electric vehicles through the charging and discharging equipment, the charging and discharging equipment can further utilize the power transmission between the charging and discharging equipment and the AC power grid based on the difference between the AC power that the electric vehicle can provide and the charging power required by other electric vehicles, so that the AC power transmitted by the electric vehicle to other electric vehicles through the charging and discharging equipment meets the charging power required by other electric vehicles.

[0029] In a second aspect, a charging and discharging system is provided, which includes a charging and discharging device and an electric vehicle. The charging and discharging device includes a resistance conversion circuit, a pile-end connection confirmation CC interface, and a pile-end AC interface, and the electric vehicle includes a vehicle-end CC interface and a vehicle-end AC interface. One end of the resistance conversion circuit is grounded, and the other end of the resistance conversion circuit is connected to the pile-end CC interface. The pile-end CC interface is used to connect to the vehicle-end CC interface, and the pile-end AC interface is used to connect to the vehicle-end AC interface. The resistance conversion circuit includes multiple switches and multiple resistors. The multiple switches are used to adjust the equivalent resistance value of the resistance conversion circuit. The equivalent resistance value of the resistance conversion circuit is used for the vehicle-end AC interface to output AC power to the pile-end AC interface, or for the vehicle-end AC interface to receive AC power output by the pile-end AC interface.

[0030] It is understood that since one end of the resistance conversion circuit is grounded and the other end is connected to the pile-end CC interface, the equivalent resistance value of the resistance conversion circuit can also refer to the resistance value of the pile-end CC interface connected to the resistance conversion circuit. Furthermore, when the pile-end CC interface and the vehicle-end CC interface are connected, the resistance values ​​of the pile-end CC interface and the vehicle-end CC interface are the same.

[0031] In the above technical solution, the resistance conversion circuit connected to the pile-end CC interface is equipped with multiple switches and resistors. The charging and discharging device can adjust the equivalent resistance of the resistance conversion circuit by controlling the on / off states of the multiple switches. Thus, the charging mode or discharging mode executed by the electric vehicle is determined by the different equivalent resistance values ​​of the resistance conversion circuit, that is, the different resistance values ​​of the pile-end CC interface. In this way, the electric vehicle can determine the resistance value of the pile-end CC interface by detecting the resistance value of the vehicle-end CC interface, and further determine the charging and discharging mode to be executed, thereby realizing the charging and discharging functions of the electric vehicle through the charging and discharging device.

[0032] Furthermore, in the embodiment of the present application, the charging and discharging device can be directly provided with a charging and discharging gun, and the pile-end CC interface and the pile-end AC interface can be provided as the CC plug and AC plug of the charging and discharging gun plug. In this way, compared to the electric vehicle using a charging gun device when charging and a discharging gun device when discharging, the charging and discharging device provided by the embodiment of the present application can avoid the need for equipment replacement during charging and discharging of the electric vehicle, simplifying the charging and discharging operations of the electric vehicle. In addition, the charging and discharging device provided by the embodiment of the present application does not require the configuration of both a charging gun device and a discharging gun device, which not only reduces the cost of the charging and discharging device, but also reduces the size of the charging and discharging device, making it easier to carry the charging and discharging device on the vehicle.

[0033] In conjunction with the second aspect, in certain implementations of the second aspect, the charging and discharging device further includes a pile-end controller, which is configured to: in response to a charging request or a discharging request from the electric vehicle, control the on / off states of multiple switches in the resistance conversion circuit to adjust the equivalent resistance value of the resistance conversion circuit to any one of a charging resistance value, a vehicle-to-grid (V2G) discharge resistance value, a vehicle-to-vehicle (V2V) discharge resistance value, and a vehicle-to-load (V2L) discharge resistance value. The charging resistance value is used by the vehicle-end AC interface to receive AC power output by the pile-end AC interface; the V2G discharge resistance value is used by the vehicle-end AC interface to output AC power to the pile-end AC interface via a V2G discharge mode; the V2V discharge resistance value is used by the vehicle-end AC interface to output AC power to the pile-end AC interface via a V2V discharge mode; and the V2L discharge resistance value is used by the vehicle-end AC interface to output AC power to the pile-end AC interface via a V2L discharge mode.

[0034] In conjunction with the second aspect, in certain implementations of the second aspect, the charging and discharging device further includes a switch unit and a pile-end control and guidance CP interface, and the electric vehicle includes a vehicle-end CP interface and a vehicle-end controller. The other end of the resistance conversion circuit is connected to the pile-end CC interface via the switch unit, and the pile-end CP interface is configured to connect to the vehicle-end CP interface. The pile-end controller is further configured to: when the pile-end AC interface is connected to the vehicle-end AC interface, the pile-end CC interface is connected to the vehicle-end CC interface, and the pile-end CP interface is connected to the vehicle-end CP interface, adjust the equivalent resistance value of the resistance conversion circuit; and control the switch unit to disconnect the other end of the resistance conversion circuit from the pile-end CC interface to adjust the voltage value of the pile-end CC interface. The vehicle-end controller is configured to: in response to detecting a change in the resistance value of the vehicle-end CC interface, adjust the voltage value of the pile-end CP interface. The pile-end controller is further configured to: in response to a change in the voltage value of the pile-end CP interface, control the switch unit to connect the other end of the resistance conversion circuit to the pile-end CC interface, so that the vehicle-end controller detects the adjusted equivalent resistance value of the resistance conversion circuit through the vehicle-end CC interface.

[0035] In combination with the second aspect, in certain implementations of the second aspect, the charging and discharging device further includes a pile-end connection confirmation circuit, and the electric vehicle further includes a vehicle-end connection confirmation circuit. The pile-end connection confirmation circuit is connected to the pile-end CP interface, and the pile-end connection confirmation circuit is used to adjust the voltage value of the pile-end CP interface. The vehicle-end connection confirmation circuit is connected to the vehicle-end CP interface, and the vehicle-end connection confirmation circuit is used to adjust the voltage of the vehicle-end CP interface. The vehicle-end controller is used to adjust the voltage value of the pile-end CP interface in response to detecting a change in the resistance value of the vehicle-end CC interface, including: the vehicle-end controller is used to: in response to detecting a change in the resistance value of the vehicle-end CC interface, control the vehicle-end connection confirmation circuit to adjust the voltage value of the pile-end CP interface. The pile-end controller is also used to control the connection between the other end of the resistance conversion circuit and the pile-end CC interface in response to a change in the voltage value of the pile-end CP interface, so that the vehicle-end controller detects the equivalent resistance value of the adjusted resistance conversion circuit through the vehicle-end CC interface, including: the pile-end controller is used to: in response to detecting a change in the voltage value of the pile-end CP interface, control the pile-end connection confirmation circuit to adjust the voltage value of the vehicle-end CP interface, so that the vehicle-end controller determines the equivalent resistance value of the resistance conversion circuit after adjustment detected through the vehicle-end CC interface according to the voltage value of the vehicle-end CP interface; control the connection between the other end of the resistance conversion circuit and the pile-end CC interface of the switch unit, so that the vehicle-end controller detects the equivalent resistance value of the adjusted resistance conversion circuit through the vehicle-end CC interface.

[0036] In conjunction with the second aspect, in certain implementations of the second aspect, the pile-end connection confirmation circuit includes a first switch, a first resistor, and a voltage source, and the vehicle-end connection confirmation circuit includes a second switch, a second resistor, and a third resistor. One end of the first switch is connected to the voltage source, and the other end of the first switch is connected to the pile-end CP interface via the first resistor. One end of the second resistor is grounded via the second switch, and the other end of the second resistor is connected to the vehicle-end CP interface. One end of the third resistor is grounded, and the other end of the third resistor is connected to the vehicle-end CP interface. A vehicle-end controller is configured to control the vehicle-end connection confirmation circuit to adjust the voltage value of the pile-end CP interface in response to detecting a change in the resistance value of the vehicle-end CC interface, including: the vehicle-end controller is configured to control the second switch to open in response to detecting a change in the resistance value of the vehicle-end CC interface to adjust the voltage value of the pile-end CP interface. The pile-end controller is configured to control the pile-end connection confirmation circuit to adjust the voltage value of the pile-end CP interface in response to detecting a change in the voltage value of the pile-end CP interface, including: the pile-end controller is configured to control the first switch to open and then close in response to detecting a change in the voltage value of the pile-end CP interface to adjust the voltage value of the vehicle-end CP interface.

[0037] In a third aspect, a charging and discharging method is provided, which includes: receiving an input instruction, the input instruction being used to indicate a charging request or a discharging request of an electric vehicle; and adjusting, in response to the input instruction, the resistance value of a connection confirmation CC interface of a charging and discharging device, the resistance value of the CC interface being used for the electric vehicle to output alternating current to the charging and discharging device, or for the electric vehicle to receive alternating current output by the charging and discharging device.

[0038] It is understandable that the above-mentioned charging and discharging method can be executed by a charging and discharging device, and specifically can be executed by a controller in the charging and discharging device.

[0039] In the above technical solution, the charging and discharging device can adjust the resistance value of the CC interface of the charging and discharging device based on the charging request or discharging request of the electric vehicle, so that the electric vehicle determines the charging mode or discharging mode to be executed by detecting the resistance value of the CC interface of the charging and discharging device, thereby realizing the charging and discharging functions of the electric vehicle. In addition, since the above charging and discharging method determines the charging mode or discharging mode to be executed by the electric vehicle through the resistance value of the CC interface of different sizes, the charging and discharging device can directly set the charging and discharging gun including the CC interface to enable the electric vehicle to determine the charging and discharging mode to be executed. This can avoid the need to replace the equipment of the electric vehicle during charging and discharging, and simplify the charging and discharging operations of the electric vehicle. In addition, the charging and discharging device provided in the embodiment of the present application does not need to be configured with a charging gun device and a discharging gun device at the same time, which can not only reduce the cost of the charging and discharging device, but also reduce the size of the charging and discharging device, making it easier to carry the charging and discharging device on the vehicle.

[0040] In conjunction with the third aspect, in certain implementations of the third aspect, the charging and discharging device includes a resistance conversion circuit, one end of the resistance conversion circuit being grounded and the other end being connected to the CC interface, the resistance conversion circuit including multiple switches and multiple resistors. In response to an input instruction, adjusting the resistance value of the CC interface of the charging and discharging device for connection confirmation includes: controlling the on / off states of multiple switches in the resistance conversion circuit in response to the input instruction to adjust the equivalent resistance value of the resistance conversion circuit to any one of a charging resistance value, a vehicle-to-grid (V2G) discharge resistance value, a vehicle-to-vehicle (V2V) discharge resistance value, and a vehicle-to-load (V2L) discharge resistance value. The charging resistance value is used for the electric vehicle to receive AC power output by the charging and discharging device; the V2G discharge resistance value is used for the electric vehicle to output AC power to the charging and discharging device via a V2G discharge mode; the V2V discharge resistance value is used for the electric vehicle to output AC power to the charging and discharging device via a V2V discharge mode; and the V2L discharge resistance value is used for the electric vehicle to output AC power to the charging and discharging device via a V2L discharge mode.

[0041] In the above technical solution, based on the input instruction indicating that the electric vehicle requests charging or discharging, the equivalent resistance value of the resistance conversion circuit connected to the CC interface of the charging and discharging device can be adjusted so that the electric vehicle determines to execute the corresponding charging mode or discharging mode by detecting the resistance value of the CC interface, thereby meeting the different charging and discharging needs of the electric vehicle.

[0042] Furthermore, even if an EV lacks V2V discharge capabilities, the charging and discharging equipment can adjust the resistance of the CC interface to a V2L discharge resistance, enabling the EV to output AC power to the AC interface based on the V2L discharge mode. The charging and discharging equipment then transmits the AC power output from the EV in V2L mode to other connected EVs, also enabling V2V discharge for the EV.

[0043] In combination with the third aspect, in certain implementations of the third aspect, the charging and discharging method further includes: when the resistance value of the CC interface is used for the electric vehicle to output AC power to the charging and discharging device, and the charging and discharging device outputs AC power to other electric vehicles, receiving a power supply capability pulse width modulation PWM signal sent by the electric vehicle, the power supply capability PWM signal being used to indicate the maximum output current value of the electric vehicle; sending the power supply capability PWM signal to other electric vehicles so that the other electric vehicles adjust the maximum allowable input current value according to the power supply capability PWM signal; and controlling the transmission of the AC power output by the electric vehicle to the other electric vehicles.

[0044] In the above technical solution, when an electric vehicle supplies power to another electric vehicle via a charging and discharging device, the charging and discharging device can transmit a PWM signal indicating the maximum output current value that the electric vehicle can provide to the other electric vehicle. In this way, the other electric vehicle can adjust its maximum allowable input current value based on the PWM signal to ensure that the electric vehicle can supply power to the other electric vehicle via the charging and discharging device normally.

[0045] In combination with the third aspect, in certain implementations of the third aspect, the charging and discharging method further includes: when the resistance value of the CC interface is used for the electric vehicle to output AC power to the charging and discharging device, and the charging and discharging device outputs AC power to other electric vehicles, receiving a power supply capability message sent by the electric vehicle, the power supply capability message is used to indicate the maximum output current value of the electric vehicle; sending the power supply capability message to the other electric vehicles so that the other electric vehicles adjust the maximum allowable input current value according to the power supply capability message; and controlling the transmission of the AC power output by the electric vehicle to the other electric vehicles.

[0046] In the above technical solution, an electric vehicle can communicate with a charging and discharging device, for example, via a wireless connection. When an electric vehicle supplies power to other electric vehicles via the charging and discharging device, the charging and discharging device can send a power supply capability message indicating the maximum output current value that the electric vehicle can provide to the other electric vehicles. In this way, the other electric vehicles can adjust their maximum allowable input current values ​​based on this message to ensure that the electric vehicle can supply power to other electric vehicles through the charging and discharging device.

[0047] Regarding the beneficial effects of the second to third aspects, reference can be made to the beneficial effects of the first aspect mentioned above, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of a charging scenario of an electric vehicle provided in an embodiment of the present application.

[0049] FIG2 is a schematic diagram of the connection structure of the electric vehicle shown in FIG1 during charging.

[0050] FIG3 is a schematic diagram of an application scenario of a charging and discharging device provided in an embodiment of the present application.

[0051] FIG4 is a schematic structural diagram of the charging and discharging device shown in FIG3 provided in an embodiment of the present application.

[0052] FIG5 is a schematic structural diagram of another charging and discharging device provided in an embodiment of the present application.

[0053] FIG6 is a specific circuit structure diagram of a resistance conversion circuit provided in an embodiment of the present application.

[0054] FIG7 is a schematic structural diagram of a charging and discharging device provided in an embodiment of the present application.

[0055] FIG8 is a schematic structural diagram of another charging and discharging device provided in an embodiment of the present application.

[0056] FIG9 is a schematic structural diagram of another charging and discharging device provided in an embodiment of the present application.

[0057] FIG10 is a schematic structural diagram of another charging and discharging device provided in an embodiment of the present application.

[0058] FIG11 is a schematic structural diagram of another charging and discharging device provided in an embodiment of the present application.

[0059] FIG12 is a schematic structural diagram of another charging and discharging device provided in an embodiment of the present application.

[0060] FIG13 is a schematic structural diagram of a charging and discharging system provided in an embodiment of the present application.

[0061] FIG14 is a specific circuit structure diagram of a pile-end connection confirmation circuit and a vehicle-end connection confirmation circuit provided in an embodiment of the present application.

[0062] FIG15 is a flow chart of a charging and discharging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] Before introducing the embodiments of the present application, the following points are explained.

[0064] In the description of the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be achieved by direct electrical connection or indirect electrical connection to achieve signal transmission between the two electrical components. For example, the connection between A and B can be understood as a direct electrical connection between A and B, or it can be understood as an indirect electrical connection between A and B through one or more other electrical components.

[0065] In the description of the embodiments of the present application, unless otherwise specified, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0066] The technical solution in this application will be described below with reference to the accompanying drawings.

[0067] In recent years, environmental pollution and energy shortages have accelerated the development and utilization of green and renewable energy. The development of new energy vehicles is an important measure to achieve energy conservation, emission reduction and pollution prevention. Among them, new energy vehicles are a kind of transportation vehicle driven by electric energy, such as pure electric vehicle (pure electric vehicle / battery electric vehicle, pure EV / battery EV), hybrid electric vehicle (hybrid electric vehicle, HEV), range extended electric vehicle (REEV) or plug-in hybrid electric vehicle (plug-in hybrid electric vehicle, PHEV), etc.

[0068] Figure 1 is a schematic diagram of a charging scenario of an electric vehicle 10 provided in an embodiment of the present application. Figure 2 is a schematic diagram of the connection structure of the electric vehicle 10 shown in Figure 1 during charging. It should be understood that the electric vehicle 10 can be the new energy vehicle described above.

[0069] 1 and 2 , an electric vehicle 10 may include an on-board charger (OBC) 11, a power battery 12, a vehicle control device 13, wheels 14, and a motor (not shown). The on-board charger 11 is connected to the power battery 12. The vehicle control device 13 may be connected to the on-board charger 11 and the power battery 12, for example, respectively, or may be directly integrated into the on-board charger 11.

[0070] The power battery 12 can be a large-capacity, high-power battery. Under the control of the vehicle control device 13, the power battery 12 can power the motor, which converts the electrical energy provided by the power battery 12 into mechanical energy, thereby driving the wheels 14 to rotate and realize the driving of the electric vehicle 10.

[0071] When charging an electric vehicle 10, the power battery 12 of the electric vehicle 10 is generally charged through a charging station 20. The charging station 20 may include a charging unit 21 and a charging gun 22. If the charging station 20 is an AC charging station, the charging unit 21 primarily includes a power transmission circuit (not shown). One end of the power transmission circuit is connected to the AC power grid 30, and the other end is connected to the charging gun 22 via a cable to transmit AC power input from the AC power grid 30 to the charging gun 22. The charging gun 22 is used to connect to the electric vehicle 10 to transmit AC power from the AC power grid 30 to the electric vehicle 10.

[0072] During specific implementation, the plug of the charging gun 22 is usually connected to the vehicle socket of the electric vehicle 10, so that the charging gun 22 is connected to the on-board charger 11 of the electric vehicle 10. The on-board charger 11 may include a connected alternating current-direct current (AC-DC) converter and a direct current-direct current (DC-DC) converter (not shown in the figure). Among them, the AC-DC converter is used to convert the alternating current output by the charging pile 20 through the charging gun 22 into direct current and output it to the DC-DC converter. The DC-DC converter is used to further convert the direct current output by the AC-DC converter into direct current suitable for the power battery 12, and transmit it to the power battery 12 to charge the power battery 12.

[0073] As described in the background technology section above, with the increasing popularity of electric vehicles 10, onboard chargers 11 within electric vehicles 10 are gradually evolving into bidirectional onboard chargers with bidirectional conversion capabilities. These bidirectional onboard chargers enable electric vehicles to not only charge but also discharge, such as vehicle-to-vehicle (V2G) and vehicle-to-vehicle (V2V) discharge.

[0074] Specifically, the bidirectional on-board charger may include a bidirectional AC-DC converter and a bidirectional DC-DC converter connected together. In one possible scenario, the bidirectional AC-DC converter is used to convert the AC power output from the charging pile 20 into DC power and output it to the bidirectional DC-DC converter. The bidirectional DC-DC converter is used to further convert the DC power output from the bidirectional AC-DC converter into DC power suitable for the power battery and transmit it to the power battery 12, thereby enabling the charging function of the electric vehicle 10. In another possible scenario, the bidirectional DC-DC converter is used to convert the DC power output from the power battery 12 into a first DC power and output it to the bidirectional AC-DC converter. The bidirectional AC-DC converter is used to convert the first DC power output from the bidirectional DC-DC converter into AC power and output it to other electric vehicles or the AC power grid 30, thereby enabling the vehicle-to-vehicle (V2G) discharge function or V2G discharge function of the electric vehicle.

[0075] However, the above-mentioned charging pile 20 generally only has a single function of charging the electric vehicle 10 and cannot effectively realize the discharge function of the electric vehicle 10. Moreover, in current practical applications, the electric vehicle 10 generally realizes the charging function and the discharging function respectively through independently designed charging gun equipment and discharging gun equipment, and the charging and discharging operations of the electric vehicle 10 are relatively cumbersome. In addition, when the electric vehicle 10 performs vehicle-to-vehicle discharge, it is usually necessary to configure a charging gun device and a discharging gun device at the same time, and connect the charging gun device and the discharging gun device to the charging vehicle and the discharging vehicle respectively. This makes the operation of the electric vehicle 10 when performing vehicle-to-vehicle discharge more complicated, and the simultaneous configuration of the charging gun device and the discharging gun device also leads to a higher overall equipment cost.

[0076] Based on the above content, the embodiments of the present application provide a charging and discharging device, a charging and discharging system, and a charging and discharging method. The charging and discharging device can realize both the charging function and the discharging function of the electric vehicle, and the charging and discharging operation is simple and the equipment cost is low.

[0077] The following is a detailed description of the charging and discharging device, charging and discharging system, and charging and discharging method provided in the embodiments of the present application, in conjunction with the accompanying drawings. It should be noted that, for ease of understanding, in the drawings provided in the embodiments of the present application, a real line is used to represent a power transmission line, and a dotted line is used to represent a signal transmission line.

[0078] Fig. 3 is a schematic diagram of an application scenario of a charging and discharging device 300 provided in an embodiment of the present application. Fig. 4 is a schematic diagram of the structure of the charging and discharging device 300 shown in Fig. 3 .

[0079] 3 , the charging and discharging device 300 can be used to connect to the electric vehicle 400 to output AC power to the electric vehicle 400 or receive AC power output by the electric vehicle 400 , thereby realizing the charging and discharging functions of the electric vehicle 400 .

[0080] Referring to Figure 4 , the charging and discharging device 300 may include a pile-end AC interface 311, a pile-end connection confirmation (CC) interface 312, and a resistance conversion circuit 320. One end of the resistance conversion circuit 320 is grounded, and the other end is connected to the pile-end CC interface 312. The pile-end AC interface 311 and the pile-end CC interface 312 are each used to connect to the electric vehicle 400.

[0081] Specifically, the charging and discharging device 300 may include multiple device interfaces 310, with a pile-end AC interface 311 and a pile-end CC interface 312 provided in each device interface 310. Each device interface 310 is configured to connect to the electric vehicle 400. There may be multiple resistance conversion circuits 320, each corresponding one-to-one to the multiple device interfaces 310. One end of each resistance conversion circuit 320 is grounded, and the other end is connected to the pile-end CC interface 312 in the corresponding device interface 310.

[0082] In one example, each device interface 310 may further include a pile-end protective earthing (PE) interface (not shown), which is connected to the device ground in the charging and discharging device 300. One end of the resistance conversion circuit 320 is connected to the pile-end PE interface in the corresponding device interface 310, and the other end is connected to the pile-end CC interface in the corresponding device interface 310. The pile-end PE interface is used to connect to the electric vehicle 400.

[0083] Exemplarily, the charging and discharging device 300 may include multiple charging and discharging guns, the device interface 310 may be a charging and discharging gun plug in the charging and discharging gun, the pile-end AC interface 311, the pile-end CC interface 312 and the pile-end PE interface are the AC plug, CC plug and PE plug in the charging and discharging gun plug, and are used to connect to the corresponding sockets in the electric vehicle 400.

[0084] For ease of description and understanding, the present embodiment is described using an example in which a charging and discharging device 300 includes two device interfaces 310. The two device interfaces 310 are respectively used to connect to two electric vehicles 400, for example, electric vehicle 400a and electric vehicle 400b.

[0085] Among them, the resistance conversion circuit 320 includes multiple switches and multiple resistors, and the multiple switches are used to adjust the equivalent resistance value of the resistance conversion circuit 320. The equivalent resistance value of the resistance conversion circuit 320 is used for the electric vehicle 400 to output AC power to the pile-end AC interface 311, or for the electric vehicle 400 to receive AC power output by the pile-end AC interface 311.

[0086] It can be understood that in the embodiment of the present application, since one end of the resistance conversion circuit 320 is grounded and the other end is connected to the pile end CC interface 312, the equivalent resistance value of the resistance conversion circuit 320 can also refer to the resistance value of the pile end CC interface 312 connected to the resistance conversion circuit 320.

[0087] It can also be understood that the equivalent resistance value of the resistance conversion circuit 320 used by the electric vehicle 400 to receive the AC power output by the pile-end AC interface 311 can be understood as the resistance value of the pile-end CC interface 312, which corresponds to the charging mode of the electric vehicle 400. The equivalent resistance value of the resistance conversion circuit 320 used by the electric vehicle 400 to output AC power to the pile-end AC interface 311 can be understood as the resistance value of the pile-end CC interface 312, which corresponds to the discharging mode of the electric vehicle 400. That is, in the embodiment of the present application, the charging and discharging device 300 corresponds to the charging mode and discharging mode of the electric vehicle 400 through the different resistance values ​​of the pile-end CC interface 312. Therefore, the electric vehicle 400 can determine whether to execute the charging mode or the discharging mode by detecting the resistance value of the pile-end CC interface 312, and execute the corresponding mode after confirming the connection with the charging and discharging device 300. For example, the electric vehicle 400 determines whether to execute the charging mode by detecting that the resistance value of the pile-end CC interface 312 is 1.5 kΩ, or the electric vehicle 400 determines whether to execute the discharging mode by detecting that the resistance value of the pile-end CC interface is 3 kΩ.

[0088] For example, taking the electric vehicle 400a connected to the charging and discharging device 300 as an example, when the electric vehicle 400a detects that the resistance value of the pile-end CC interface 312 corresponds to the charging mode of the electric vehicle 400a, the electric vehicle 400a can receive the AC power output by the pile-end AC interface 311 of the charging and discharging device 300 after completing the connection confirmation with the charging and discharging device 300, and convert the AC power into DC power and transmit it to the power battery to realize the charging function of the electric vehicle 400a.

[0089] Alternatively, when electric vehicle 400a detects that the resistance value of the charging-end CC interface 312 corresponds to the discharge mode of electric vehicle 400a, electric vehicle 400a, after completing the connection confirmation with the charging-discharging device 300, can convert the DC power stored in the power battery into AC power and output it to the charging-discharging device 300's charging-discharging device 300, thereby realizing the discharge function of electric vehicle 400a. For example, the charging-discharging device 300 can transmit the AC power output by electric vehicle 400a received by the charging-end AC interface 311 to electric vehicle 400b connected to the charging-discharging device 300, thereby realizing the V2V discharge function of electric vehicle 400a.

[0090] In the above technical solution, the resistance conversion circuit 320 connected to the pile-end CC interface 312 is equipped with multiple switches and resistors. The charging and discharging device 300 can adjust the equivalent resistance value of the resistance conversion circuit 320 by controlling the on / off states of the multiple switches. Thus, the charging and discharging modes of the electric vehicle 400 are matched to the different equivalent resistance values ​​of the resistance conversion circuit 320, that is, the different resistance values ​​of the pile-end CC interface 312. In this way, the electric vehicle 400 can determine the charging and discharging mode to be executed by detecting the resistance value of the pile-end CC interface 312, and then realize the charging and discharging functions of the electric vehicle 400 through the charging and discharging device 300, for example, realizing the V2V discharging function of the electric vehicle 400.

[0091] Furthermore, since the charging and discharging device 300 determines the charging and discharging mode to be executed by the electric vehicle 400 through the resistance values ​​of the pile-end CC interface 312 of different sizes, in a specific implementation, the charging and discharging device 300 can be directly provided with a charging and discharging gun, and the pile-end CC interface 312 and the pile-end AC interface 311 are provided as the CC plug and AC plug in the charging and discharging gun plug. In this way, compared to the electric vehicle 400 using a charging gun device when charging and a discharging gun device when discharging, the charging and discharging device 300 provided in the embodiment of the present application can avoid the need for equipment replacement during charging and discharging of the electric vehicle 400, thereby simplifying the charging and discharging operations of the electric vehicle 400. In addition, the charging and discharging device 300 provided in the embodiment of the present application does not require the configuration of both a charging gun device and a discharging gun device, which not only reduces the cost of the charging and discharging device 300, but also reduces the size of the charging and discharging device 300, making it easier to carry the charging and discharging device 300 on the vehicle.

[0092] Continuing with FIG4 , in some embodiments, in order for the charging and discharging device 300 to implement the charging function and different discharging functions of the electric vehicle 400, the charging and discharging device 300 may further include a power transmission line 330. The power transmission line 330 may be used to transmit the AC power output by the electric vehicle 400, received by the pile-end AC interface 311, to other electric vehicles connected to the charging and discharging device 300. For example, the AC power output by electric vehicle 400a may be transmitted to electric vehicle 400b to implement the V2V discharging function of electric vehicle 400a and the charging function of electric vehicle 400b. Specifically, the pile-end AC interfaces 311 in any two device interfaces 310 are connected via the power transmission line 330.

[0093] Alternatively, the power transmission line 330 may also be used to transmit AC power from the AC grid to the electric vehicle 400 connected to the pile-end AC interface 311, thereby enabling charging of the electric vehicle 400. Alternatively, the power transmission line 330 may also be used to transmit AC power output by the electric vehicle 400 and received by the pile-end AC interface 311 to the AC grid, thereby enabling V2G discharging of the electric vehicle 400.

[0094] In the above technical solution, the charging and discharging device 300, via the power transmission line 330, not only enables power transmission between the electric vehicle 400 and other electric vehicles, but also between the AC power grid and the electric vehicle 400. This allows the electric vehicle 400 to perform charging, V2G discharging, and V2V discharging functions through the charging and discharging device 300, meeting the charging and discharging needs of the electric vehicle 400 in different scenarios. Furthermore, the electric vehicle 400 can receive relatively cheap off-peak electricity from the AC power grid 500 at night via the power transmission line 330, and provide cheaper electricity than peak electricity to other electric vehicles in need of charging during the day. This helps discharge vehicle owners earn additional income, reduces charging costs for charging vehicle owners, and alleviates pressure on the power grid.

[0095] Furthermore, because the charging and discharging device 300 transmits AC power between the AC power grid and the electric vehicle 400, as well as between the electric vehicle 400 and other electric vehicles, there is no need for a power conversion device to convert AC power into DC power within the charging and discharging device 300. This reduces the size of the charging and discharging device 300, making it easier to carry the charging and discharging device 300 on a vehicle. This allows the electric vehicle 400 to readily provide power to other electric vehicles through the charging and discharging device 300 in various scenarios, thereby generating corresponding benefits.

[0096] FIG5 is a schematic structural diagram of another charging and discharging device 300 provided in an embodiment of the present application.

[0097] Referring to FIG. 5 , in some embodiments, the charging and discharging device 300 may further include a power supply interface 360 ​​for connecting to the AC power grid 500. The power supply interface 360 ​​is connected to the pile-end AC interface 311 in each device interface 310 via a power transmission line 330 to enable power transmission between the AC power grid 500 and the pile-end AC interface 311. The power supply interface 360 ​​may specifically be a power plug. If the charging and discharging device 300 is located in an environment with a standard socket connected to the AC power grid 500, the power plug can be plugged into the standard socket to connect the charging and discharging device 300 to the AC power grid 500.

[0098] Continuing to refer to FIG5 , in some embodiments, in order to enable the power transmission line 330 to achieve power transmission along different paths, the charging and discharging device 300 may further include a power supply interface side switch 381 and multiple AC interface side switches 382 provided on the power transmission line 330. The power supply interface 360 ​​is connected to the pile-end AC interface 311 in each device interface 310 via the power supply interface side switch 381. The multiple AC interface side switches 382 correspond one-to-one to the multiple device interfaces 310, and the pile-end AC interface 311 in each device interface 310 is connected to the pile-end AC interface 311 in other device interfaces 310 and the power supply interface 360 ​​via the corresponding AC interface side switch 382.

[0099] In a specific implementation, the charging and discharging device 300 may further include a pile-end controller 340, which is connected to the power supply interface side switch 381 and each AC interface side switch 382. The pile-end controller 340 can be used to control the power supply interface side switch 381 and each AC interface side switch 382 to be closed or opened, so as to connect or disconnect the power transmission line 330 between the power supply interface 360 ​​and the pile-end AC interface 311 in any device interface 310; and / or to connect or disconnect the power transmission line 330 between the pile-end AC interfaces 311 in any two device interfaces 310.

[0100] Continuing with FIG. 5 , in some embodiments, to facilitate the electric vehicle 400 to sell electricity through the charging and discharging device 300, the charging and discharging device 300 may further include an AC interface-side meter 350. The AC interface-side meter 350 may be used to measure the amount of AC power received by the electric vehicle 400 and output by the pile-end AC interface 311, or to measure the amount of AC power output by the pile-end AC interface 311 to the electric vehicle 400. In one example, there may be multiple AC interface-side meters 350, each corresponding one-to-one to a plurality of device interfaces 310, with each AC interface-side meter 350 connected to the pile-end AC interface 311 in the corresponding device interface 310.

[0101] In a specific implementation, the pile-end controller 340 may be connected to the AC interface-side electric meter 350 to obtain the AC power measured by the AC interface-side electric meter 350 , so as to facilitate the metering and billing of the power.

[0102] In the above technical solution, the charging and discharging device 300 can measure the amount of electricity transmitted from the electric vehicle 400 to the AC power grid 500 and other electric vehicles through the AC interface side meter 350 when the electric vehicle 400 realizes the V2G discharge function and the V2V discharge function through the charging and discharging device 300, so as to obtain corresponding benefits.

[0103] Continuing with FIG5 , in other embodiments, the charging and discharging device 300 may further include a power supply interface-side meter 370 . The power supply interface-side meter 370 is connected to the power supply interface 360 ​​. The power supply interface-side meter 370 is used to measure the amount of AC power received by the power supply interface 360 ​​from the AC grid 500 , or to measure the amount of AC power output by the power supply interface 360 ​​to the AC grid 500 . In a specific implementation, the pile-end controller 340 is connected to the power supply interface-side meter 370 to obtain the amount of AC power measured by the power supply interface-side meter 370 , facilitating metering and billing of power.

[0104] In the above technical solution, the charging and discharging device 300 can measure the amount of electricity transmitted from the electric vehicle 400 to the AC power grid 500 through the power supply interface side meter 370 when the electric vehicle 400 realizes the V2G discharge function through the charging and discharging device 300 to obtain corresponding benefits.

[0105] Continuing to refer to FIG5 , in actual use of the charging and discharging device 300 , in order to realize the charging function, V2V discharging function, and V2G discharging function of the electric vehicle 400 , the pile-end controller 340 may also be connected to the resistance conversion circuit 320 to control the on / off states of multiple switches in the resistance conversion circuit 320 , thereby adjusting the equivalent resistance value of the resistance conversion circuit 320 .

[0106] In one example, taking the connection between the charging and discharging device 300 and the electric vehicle 400a as an example, the pile end controller 340 can be used to:

[0107] In response to a charge or discharge request from the electric vehicle 400a, the on / off states of multiple switches in the resistance conversion circuit 320 are controlled to adjust the equivalent resistance of the resistance conversion circuit 320 to any one of a charging resistance value, a V2G discharge resistance value, a V2V discharge resistance value, and a vehicle-to-load (V2L) discharge resistance value. The charging resistance value is used by the electric vehicle 400a to receive AC power from the charging terminal AC interface 311; the V2G discharge resistance value is used by the electric vehicle 400a to output AC power to the charging terminal AC interface 311 via the V2G discharge mode; the V2V discharge resistance value is used by the electric vehicle 400a to output AC power to the charging terminal AC interface 311 via the V2V discharge mode; and the V2L discharge resistance value is used by the electric vehicle 400a to output AC power to the charging terminal AC interface 311 via the V2L discharge mode.

[0108] Optionally, the charging and discharging device 300 may be provided with a human-machine interface, and the pile-end controller 340 may receive instructions inputted by the owner of the electric vehicle 400a on the human-machine interface, indicating a charge request or a discharge request for the electric vehicle 400a. Alternatively, the pile-end controller 340 may be connected to a terminal device (e.g., a mobile phone, tablet, etc.) via a cloud platform, thereby receiving instructions inputted by the owner on the terminal device, indicating a charge request or a discharge request for the electric vehicle 400a, via the cloud platform.

[0109] It can be understood that the charging request can indicate that the electric vehicle 400a requests to execute the charging mode to achieve the charging function, and the discharging request can indicate that the electric vehicle 400a requests to execute the V2G discharge mode to achieve the V2G discharge function, the electric vehicle 400a requests to execute the V2V discharge mode to achieve the V2V discharge function, and the electric vehicle 400a requests to execute the V2L discharge mode to achieve the V2V discharge function.

[0110] Specifically, when the pile-end controller 340 receives a charging request from the electric vehicle 400a, it adjusts the equivalent resistance of the resistance conversion circuit 320 to a charging resistance, that is, adjusts the resistance of the pile-end CC interface 312 to a charging resistance, so that the electric vehicle 400a determines whether to execute the charging mode by detecting the resistance of the pile-end CC interface 312. The pile-end controller 340 then controls the transmission of AC power from the AC grid 500 and / or AC power output from other electric vehicles to the charging and discharging device 300, such as the AC power output from the electric vehicle 400b to the charging and discharging device 300, to the electric vehicle 400a, thereby enabling the charging function of the electric vehicle 400a.

[0111] When the pile-side controller 340 receives a request from the electric vehicle 400a to execute the V2G discharge mode to implement the V2G discharge function, the pile-side controller 340 adjusts the equivalent resistance value of the resistance conversion circuit 320 to the V2G discharge resistance value, so that the electric vehicle 400a determines that the V2G discharge mode is being executed by detecting the resistance value of the pile-side CC interface 312. The electric vehicle 400a then outputs AC power to the pile-side AC interface 311 by executing the V2G discharge mode. The pile-side controller 340 then controls the transmission of the AC power output by the electric vehicle 400a to the AC power grid 500, thereby implementing the V2G discharge function of the electric vehicle 400a.

[0112] When the pile-side controller 340 receives a request from electric vehicle 400a to execute the V2V discharge mode to implement the V2V discharge function, it adjusts the equivalent resistance of the resistance conversion circuit 320 to the V2V discharge resistance, causing electric vehicle 400a to determine that the V2V discharge mode has been executed by detecting the resistance of the pile-side CC interface 312. Electric vehicle 400a then outputs AC power to the pile-side AC interface 311 by executing the V2V discharge mode. The pile-side controller 340 then controls the transmission of the AC power output by electric vehicle 400a to other electric vehicles connected to the charging and discharging device 300, such as electric vehicle 400b, to implement the V2V discharge function of electric vehicle 400a.

[0113] When the pile-end controller 340 receives a discharge request from electric vehicle 400a to execute the V2L discharge mode to implement the V2V discharge function, the pile-end controller 340 can adjust the equivalent resistance value of the resistance conversion circuit 320 to the V2L discharge resistance value, so that electric vehicle 400a determines to execute the V2L discharge mode by detecting the resistance value of the pile-end CC interface 312. Electric vehicle 400a then outputs AC power to the pile-end AC interface 311 by executing the V2L discharge mode. The pile-end controller 340 controls the transmission of the AC power output by electric vehicle 400a to other electric vehicles connected to the charging and discharging device 300, such as electric vehicle 400b, to similarly implement the V2V discharge function of electric vehicle 400a.

[0114] In the above technical solution, the charging and discharging device 300 can adjust the equivalent resistance value of the resistance conversion circuit 320 connected to the pile-end CC interface 311 based on the charging or discharging request of the electric vehicle 400, so that the electric vehicle 400 can determine whether to implement the corresponding charging mode or discharging mode by detecting the resistance value of the pile-end CC interface 312. In addition, the electric vehicle 400 typically implements different discharge functions by implementing different discharge modes. For example, when the electric vehicle 400 needs to discharge to other electric vehicles to implement the V2V discharge function, the electric vehicle 400 typically outputs AC power by implementing the V2V discharge mode. In the embodiment of the present application, even if the electric vehicle 400 does not have the V2V discharge mode, the charging and discharging device 300 can adjust the resistance value of the pile-end CC interface 312 to the V2L discharge resistance value, so that the electric vehicle 400 can output AC power to the pile-end AC interface 311 based on the V2L discharge mode. The charging and discharging device 300 can further transmit the AC power output by the electric vehicle 400 based on the V2L discharge mode to other connected electric vehicles to implement the V2V discharge function of the electric vehicle 400.

[0115] It should be understood that the adjustment of the equivalent resistance value of the resistance conversion circuit 320 to four different equivalent resistance values, including the charging resistance value, the V2G discharge resistance value, the V2V discharge resistance value, and the V2L discharge resistance value, in the above embodiment is merely illustrative. For example, in other embodiments, the equivalent resistance value of the resistance conversion circuit 320 may also be adjusted to two different resistance values, including the charging resistance value and the V2V discharge resistance value.

[0116] FIG6 exemplarily shows a specific circuit structure of a resistance conversion circuit 320 that can adjust four different equivalent resistance values ​​provided by an embodiment of the present application.

[0117] 6, the resistance conversion circuit 320 may include a charging resistance circuit 321, a V2G discharge resistance circuit 322, a V2L discharge resistance circuit 323, and a V2V discharge resistance circuit 324 connected in parallel between the CC interface 312 of the pile end and the ground. The charging resistance circuit 321 includes a resistor R1, a resistor R2, a switch S1, and a switch S2. a The V2G discharge resistor circuit 322 includes a resistor R3, a resistor R4, a switch S2 and a switch S k The V2L discharge resistor circuit 323 includes a resistor R5, a resistor R6, a switch S3 and a switch S c The V2V discharge resistor circuit 324 includes a resistor R7, a resistor R8, a switch S4 and a switch S d .

[0118] One end of the switch S1, one end of the switch S2, one end of the switch S3 and one end of the switch S4 are connected in parallel to serve as one end of the resistance conversion circuit 320 and are grounded. The other end of the switch S1 is connected to the switch S3 through the resistor R2. a The other end of switch S2 is connected to switch S1 through resistor R4. b The other end of switch S3 is connected to switch S through resistor R6. c The other end of switch S4 is connected to switch S through resistor R8. d One end of the resistor R7 is connected in parallel with the switch S4. a The other end of the switch S b The other end of the switch S c The other end and switch S d The other end of the resistor is connected in parallel to serve as the other end of the resistance conversion circuit 320 and is connected to the pile end CC interface 312.

[0119] In a specific implementation, when the pile-end controller 340 adjusts the equivalent resistance value of the resistance conversion circuit 320 to the charging resistance value, the pile-end controller 340 controls each switch in the charging resistance circuit 321 to be closed, and controls each switch in the V2G discharge resistance circuit 322, the V2L discharge resistance circuit 323, and the V2V discharge resistance circuit 324 to be open, that is, controls the switch S1, the switch S2, and the switch S3. a Close, control switch S2, switch S b , switch S3, switch S c , switch S4 and switch S d At this time, the equivalent resistance value of the resistance conversion circuit 320 is the resistor R2, that is, the charging resistance value is the resistor R2.

[0120] Similarly, when the pile-side controller 340 adjusts the equivalent resistance of the resistance conversion circuit 320 to the V2G discharge resistance, the pile-side controller 340 controls the switches in the V2G discharge resistance circuit 322 to close and the switches in the charging resistance circuit 321, the V2L discharge resistance circuit 323, and the V2V discharge resistance circuit 324 to open. At this point, the equivalent resistance of the resistance conversion circuit 320 is resistor R4, meaning that the V2G discharge resistance is resistor R4.

[0121] When the pile-side controller 340 adjusts the equivalent resistance of the resistance conversion circuit 320 to the V2L discharge resistance, the pile-side controller 340 controls the switches in the V2L discharge resistance circuit 323 to close and controls the switches in the charging resistance circuit 321, the V2G discharge resistance circuit 322, and the V2V discharge resistance circuit 324 to open. At this point, the equivalent resistance of the resistance conversion circuit 320 is resistor R6, meaning that the V2L discharge resistance is resistor R6.

[0122] When the pile-side controller 340 adjusts the equivalent resistance of the resistance conversion circuit 320 to the V2V discharge resistance, the pile-side controller 340 controls the switches in the V2V discharge resistance circuit 324 to close and controls the switches in the charging resistance circuit 321, the V2G discharge resistance circuit 322, and the V2L discharge resistance circuit 323 to open. At this point, the equivalent resistance of the resistance conversion circuit 320 is resistor R8, meaning that the V2V discharge resistance is resistor R8.

[0123] The resistance values ​​of the resistor R2 , the resistor R4 , the resistor R6 , and the resistor R8 are all different.

[0124] It will be understood that the specific circuit structure of the above-mentioned resistance conversion circuit 320 is merely illustrative. In the embodiment of the present application, as long as the circuit structure of the resistance conversion circuit 320 can achieve that the equivalent resistance value of the resistance conversion circuit 320 can be adjusted to at least two different equivalent resistance values ​​corresponding to the charging mode and the discharging mode of the electric vehicle 400, it will be sufficient.

[0125] The above takes the electric vehicle 400a connected to the charging and discharging device 300 as an example to introduce the specific process of the electric vehicle 400a executing the charging mode, V2V discharge mode, V2L discharge mode and V2V discharge mode by detecting the resistance value of the CC interface 312 at the pile end. The following further takes the electric vehicles 400a and 400b connected to the charging and discharging device 300 as examples to introduce the specific process of the charging and discharging device 300 respectively realizing the charging function, V2G discharge function and V2V discharge function of the electric vehicle 400a.

[0126] FIG7 is a schematic structural diagram of a charging and discharging device 300 provided in an embodiment of the present application.

[0127] As shown in Figure 7, the two device interfaces 310 of the charging and discharging device 300 are connected to the electric vehicle 400a and the electric vehicle 400b, respectively. The device interface 310 connected to the electric vehicle 400a is designated as 310a, and the device interface 310 connected to the electric vehicle 400b is designated as device interface 310b. Accordingly, the pile-end AC interface 311 and the pile-end CC interface 312 in the device interface 310a are designated as pile-end AC interface 311a and pile-end CC interface 312a, respectively. The pile-end AC interface 311 and the pile-end CC interface 312 in the device interface 310b are designated as pile-end AC interface 311b and pile-end CC interface 312b, respectively. The AC interface-side electric meter 350 connected to the pile-end AC interface 311a is designated as 350a, and the AC interface-side electric meter 350 connected to the pile-end AC interface 311b is designated as 350b. The resistance conversion circuit 320 connected to the pile end CC interface 312a is recorded as a resistance conversion circuit 320a, and the resistance conversion circuit 320 connected to the pile end CC interface 312b is recorded as a resistance conversion circuit 320b.

[0128] In some embodiments, the pile-end controller 340 can be configured to, when the power supply interface 360 ​​is connected to the AC power grid 500 (i.e., when the charging and discharging device 300 is grid-connected), adjust the equivalent resistance values ​​of the resistance conversion circuits 320a and 320b to charging resistance values ​​in response to charging requests from the electric vehicle 400a and the electric vehicle 400b. This means that the resistance values ​​of the pile-end CC interface 312a and the pile-end CC interface 312b are adjusted to charging resistance values. Consequently, the electric vehicles 400a and 400b execute charging modes based on the resistance values ​​of the pile-end CC interface 312a and the pile-end CC interface 312b, respectively.

[0129] Furthermore, in some embodiments, the pile-end controller 340 is also used to control the transmission of AC power from the AC power grid 500 to the electric vehicles 400a and 400b through the pile-end AC interface 311a and the pile-end AC interface 311b, respectively, to realize the charging function of the electric vehicles 400a and 400b.

[0130] In a specific implementation, the pile-end controller 340 can be specifically used to: control the power supply interface side switch 381, the AC interface side switch 382 correspondingly connected to the pile-end AC interface 311a, and the AC interface side switch 382 correspondingly connected to the pile-end AC interface 311b to be closed, so that the power transmission line 330 between the power supply interface 360 ​​and the pile-end AC interface 311a, and the power supply interface 360 ​​and the pile-end AC interface 311b is turned on, so as to facilitate power transmission between the AC power grid 500 and the electric vehicle 400a, and the electric vehicle 400.

[0131] In the above embodiment, the power interface-side meter 370 is used to measure the amount of electricity input from the external power grid 500 to the charging and discharging device 300, and the AC interface-side meter 350a and the AC interface-side meter 350b are used to measure the amount of AC electricity output from the charging and discharging device 300 to the electric vehicles 400a and 400b, respectively. The AC electricity measured by the power interface-side meter 370 = the AC electricity measured by the AC interface-side meter 350a + the AC electricity measured by the AC interface-side meter 350b.

[0132] FIG8 is a schematic structural diagram of another charging and discharging device 300 provided in an embodiment of the present application.

[0133] Unlike the embodiment shown in FIG7 , in the embodiment shown in FIG8 , the pile-end controller 340 can be configured to adjust the equivalent resistance values ​​of the resistance conversion circuits 320a and 320b to V2G discharge resistance values ​​in response to discharge requests from electric vehicles 400a and 400b to execute the V2G discharge mode when the power supply interface 360 ​​is connected to the AC power grid 500 (i.e., when the charging and discharging device 300 is grid-connected). Thus, electric vehicles 400a and 400b execute the V2G discharge mode based on the resistance values ​​of the pile-end CC interface 312a and 312b, respectively.

[0134] Furthermore, in some embodiments, the pile-end controller 340 is also used to control the transmission of the AC power output by the electric vehicle 400a received by the pile-end AC interface 311a and the AC power output by the electric vehicle 400b received by the pile-end AC interface 311b to the AC power grid 500 through the power supply interface 360, so as to realize the V2G discharge function of the electric vehicle 400a and the electric vehicle 400b.

[0135] In the above embodiment, the power interface-side electric meter 370 is used to measure the amount of electricity input from the charging and discharging device 300 to the AC power grid 500, and the AC interface-side electric meter 350a and the AC interface-side electric meter 350b are used to measure the amount of AC electricity output from the electric vehicle 400a and the electric vehicle 400b to the charging and discharging device 300, respectively. The amount of electricity measured by the power interface-side electric meter 370 = the amount of AC electricity measured by the AC interface-side electric meter 350a + the amount of AC electricity measured by the AC interface-side electric meter 350b.

[0136] FIG9 is a schematic structural diagram of another charging and discharging device 300 provided in an embodiment of the present application.

[0137] Unlike the embodiments shown in Figures 7 and 8 , in the embodiment shown in Figure 9 , the controller 310 can be configured to, when the power supply interface 360 ​​is not connected to the AC power grid 500, that is, when the charging and discharging device 300 is off-grid, adjust the equivalent resistance value of the resistance conversion circuit 320a to a V2V discharge resistance value (or a V2L discharge resistance value) and adjust the equivalent resistance value of the resistance conversion circuit 320b to a charging resistance value in response to a discharge request from the electric vehicle 400a requesting to execute the V2V discharge mode (or a discharge request requesting to execute the V2L discharge mode) and a charge request from the electric vehicle 400b. Thus, the electric vehicle 400a executes the V2V discharge mode (or the V2L discharge mode) based on the resistance value of the charging-end CC interface 312a, and the electric vehicle 400b executes the charging mode based on the resistance value of the charging-end CC interface 312b.

[0138] Furthermore, in some embodiments, the pile-end controller 340 is also used to control the transmission of the AC power output by the electric vehicle 400a received by the pile-end AC interface 311a to the electric vehicle 400b through the pile-end AC interface 311b, so as to realize the V2V discharging function of the electric vehicle 400a and the charging function of the electric vehicle 400b.

[0139] In a specific implementation, the pile-end controller 340 can be specifically used to control the AC interface side switch 382 correspondingly connected to the pile-end AC interface 311a and the AC interface side switch 382 correspondingly connected to the pile-end AC interface 311b to close, so that the power transmission line 330 between the pile-end AC interface 311a and the pile-end AC interface 311b is connected, so as to facilitate power transmission between the electric vehicle 400a and the electric vehicle 400b.

[0140] In the above embodiment, the AC interface-side meter 350a is used to measure the AC power output by the electric vehicle 400a to the charging and discharging device 300, and the AC interface-side meter 350b is used to measure the AC power output by the charging and discharging device 300 to the electric vehicle 400b. The AC power measured by the AC interface-side meter 350a equals the AC power measured by the AC interface-side meter 350b.

[0141] FIG10 and FIG11 are respectively specific example diagrams of another charging and discharging device 300 provided in an embodiment of the present application.

[0142] Unlike the embodiments shown in Figures 7 to 9, in the embodiments shown in Figures 10 and 11, the pile-end controller 340 can be used to, when the power supply interface 360 ​​is connected to the AC power grid 500, that is, when the charging and discharging device 300 is grid-connected, in response to a discharge request from electric vehicle 400a to execute a V2V discharge mode (or a discharge request to execute a V2L discharge mode) and a charge request from electric vehicle 400b, adjust the equivalent resistance value of the resistance conversion circuit 320a to a V2V discharge resistance value (or a V2L discharge resistance value), and adjust the equivalent resistance value of the resistance conversion circuit 320b to a charging resistance value. Thus, electric vehicle 400a executes the V2V discharge mode (or the V2L discharge mode) based on the resistance value of the pile-end CC interface 312a, and electric vehicle 400b executes the charging mode based on the resistance value of the pile-end CC interface 312b.

[0143] Furthermore, in some embodiments, as shown in FIG10 , the pile-end controller 340 may also be configured to, when the pile-end AC interface 311 a receives the AC power output by the electric vehicle 400 a by executing the V2L discharge mode or the V2V discharge mode, and the charging and discharging device 300 outputs the AC power to the electric vehicle 400 b, in response to the AC power output by the electric vehicle 400 a received by the pile-end AC interface 311 a being less than the charging demand power output by the electric vehicle 400 a, control the AC power from the AC grid 500 and the AC power received by the pile-end AC interface 311 a to be transmitted to the electric vehicle 400 b through the pile-end AC interface 311 b.

[0144] Alternatively, in some other embodiments, as shown in FIG11 , the pile-end controller 340 may also be configured to, when the pile-end AC interface 311a receives the AC power output by the electric vehicle 400a by executing the V2L discharge mode or the V2V discharge mode, and the charging and discharging device 300 outputs the AC power to the electric vehicle 400b, control the AC power received by the pile-end AC interface 311a to be transmitted to the AC power grid 500, and to be transmitted to the electric vehicle 400b through the pile-end AC interface 311b, in response to the AC power output by the electric vehicle 400a received by the pile-end AC interface 311a being greater than the charging demand power output by the electric vehicle 400a.

[0145] Specifically, the pile-end controller 340 can be configured to receive a maximum output power PWM signal transmitted by the electric vehicle 400a, and a charging demand pulse width modulation (PWM) signal transmitted by the electric vehicle 400b. The maximum output power PWM signal indicates the maximum AC power output of the electric vehicle 400a, while the charging demand PWM signal indicates the charging demand of the electric vehicle 400b. Furthermore, the pile-end controller 340 can determine the relative relationship between the AC power output of the electric vehicle 400a and the charging power required by the electric vehicle 400b based on the maximum output power PWM signal and the charging demand PWM signal, thereby determining whether to further utilize the AC power grid 500 to meet the charging demand of the electric vehicle 400b.

[0146] For example, when the AC power output by electric vehicle 400a is less than the required charging power of electric vehicle 400b, the pile-end controller 340 can control the power supply interface-side switch 381, the AC interface-side switch 382 correspondingly connected to the pile-end AC interface 311a, and the AC interface-side switch 383 correspondingly connected to the pile-end AC interface 311b to close, thereby connecting the power transmission line 330 between the pile-end AC interface 311a and the pile-end AC interface 311b, and the power transmission line 330 between the power supply interface 360 ​​and the pile-end AC interface 311b. Furthermore, the pile-end controller 340 can control the transmission of the AC power output by electric vehicle 400a and the AC power output by AC grid 500 to electric vehicle 400b connected to the pile-end AC interface 311b to meet the charging needs of electric vehicle 400b.

[0147] In the above embodiment, the power interface-side meter 370 is used to measure the AC power input from the AC grid 500 to the charging and discharging device 300, the AC interface-side meter 350a is used to measure the AC power output from the electric vehicle 400a to the charging and discharging device 300, and the AC interface-side meter 350b is used to measure the AC power output from the charging and discharging device 300 to the electric vehicle 400b. The AC power measured by the power interface-side meter 370 + the AC power measured by the AC interface-side meter 350a = the AC power measured by the AC interface-side meter 350b.

[0148] Alternatively, the pile-end controller 340 can also control the power supply interface side switch 381, the AC interface side switch 382 correspondingly connected to the pile-end AC interface 311a, and the AC interface side switch 383 correspondingly connected to the pile-end AC interface 311b to close when the AC power output by the electric vehicle 400a is greater than the charging power required by the electric vehicle 400b, so that the power transmission line 330 between the pile-end AC interface 311a and the pile-end AC interface 311b, as well as the power transmission line 330 between the power supply interface 360 ​​and the pile-end AC interface 311a, are conductive. Furthermore, the pile-end controller 340 can control the AC power output by the electric vehicle 400a to be transmitted to the AC grid connected to the power supply interface 360 ​​and the electric vehicle 400b connected to the pile-end AC interface 311b, thereby meeting the charging needs of the electric vehicle 400b.

[0149] In the above embodiment, the power interface-side meter 370 is used to measure the AC power input from the charging and discharging device 300 to the AC power grid 500, the AC interface-side meter 350a is used to measure the AC power output from the electric vehicle 400a to the charging and discharging device 300, and the AC interface-side meter 350b is used to measure the AC power output from the charging and discharging device 300 to the electric vehicle 400b. The AC power measured by the AC interface-side meter 350a = the AC power measured by the power interface-side meter 370 + the AC power measured by the AC interface-side meter 350b.

[0150] In the above technical solution, when the charging and discharging device 300 is connected to the AC power grid 500, and the electric vehicle 400 provides electric energy to other electric vehicles through the charging and discharging device 300, the charging and discharging device 300 can further utilize the power transmission between the charging and discharging device 300 and the AC power grid 500 based on the difference between the AC power that the electric vehicle 400 can provide and the charging power required by other electric vehicles, so that the AC power transmitted from the electric vehicle 400 to other electric vehicles through the charging and discharging device 300 meets the charging power required by other electric vehicles.

[0151] Figure 12 is a schematic diagram of the structure of another charging and discharging device 300 provided in an embodiment of the present application. It should be understood that the embodiment shown in Figure 12 includes most of the technical features of the embodiments shown in Figures 4 to 11, and the following mainly describes the differences between the two.

[0152] Referring to FIG. 12 , in some embodiments, the charging and discharging device 300 may further include a switch unit 390 and a pile-end control pilot (CP) interface 313. One end of the resistance conversion circuit 320 is grounded, and the other end is connected to the pile-end CC interface 312 via the switch unit 390. The switch unit 390 is used to disconnect or connect the other end of the resistance conversion circuit 320 from the pile-end CC interface 312. The pile-end CP interface 313 is used to connect to the electric vehicle 400. The pile-end CP interface 313 can be specifically provided in each device interface 310. The pile-end controller 340 is connected to the switch unit 390 and the pile-end CP interface 313, respectively.

[0153] In some embodiments, taking the connection between the charging and discharging device 300 and the electric vehicle 400a as an example, the pile end controller 340 can also be used to:

[0154] When the pile-end AC interface 311, the pile-end CC interface 312, and the pile-end CP interface 313 are all connected to the electric vehicle 400a, the equivalent resistance value of the resistance conversion circuit 320 is adjusted;

[0155] Control the switch unit 390 to disconnect the other end of the resistance conversion circuit 320 from the CC interface 312 at the base end;

[0156] In response to the change in the voltage value of the pile end CP interface 313, the control switch unit 390 turns on the connection between the other end of the resistance conversion circuit 320 and the pile end CC interface 312, so that the electric vehicle 400a detects the adjusted equivalent resistance value of the resistance conversion circuit 320 through the pile end CC interface 312.

[0157] Specifically, when the electric vehicle 400a is charged or discharged through the charging and discharging device 300, if it is necessary to change the charging and discharging mode executed by the electric vehicle 400a, for example, when the electric vehicle 400a determines to execute the charging mode by detecting the equivalent resistance value of the resistance conversion circuit 320, if it is necessary to change the electric vehicle 400a to execute the V2V discharge mode, then the pile end controller 340 needs to adjust the equivalent resistance value of the resistance conversion circuit 320 from the current charging resistance value to the V2V discharge resistance value, that is, adjust the resistance value of the pile end CC interface 312 connected to the resistance conversion circuit 320 from the current charging resistance value to the V2V discharge resistance value.

[0158] It is understandable that since the electric vehicle 400a can generally detect the V2V discharge resistance value only when the resistance value of the pile-end CC interface 312 changes from infinite to the V2V discharge resistance value, after the pile-end controller 340 adjusts the equivalent resistance value of the resistance conversion circuit 320 from the current charging resistance value to the V2V discharge resistance value, it can first control the switch unit 390 to disconnect the other end of the resistance conversion circuit 320 from the pile-end CC interface 312, so that the resistance value of the pile-end CC interface 312 becomes infinite.

[0159] When electric vehicle 400a detects that the resistance value of pile-end CC interface 312 is infinite, electric vehicle 400a can respond by adjusting the voltage value of pile-end CP interface 313. Furthermore, based on the detected change in the voltage value of pile-end CP interface 313, charging and discharging device 300 determines that electric vehicle 400a has detected that the resistance value of pile-end CC interface 312 is infinite, and then controls switch unit 390 to reconnect the connection between the other end of resistance conversion circuit 320 and pile-end CC interface 312, causing the resistance value of pile-end CC interface 312 to change from infinite to the equivalent resistance value of resistance conversion circuit 320 after adjustment, i.e., to the V2V discharge resistance value. Thus, after the connection between the other end of resistance conversion circuit 320 and pile-end CC interface 312 is reconnected, based on the change in the resistance value of pile-end CC interface 312 from infinite to the V2V discharge resistance value, electric vehicle 400a can detect that the resistance value of pile-end CC interface 312 is now the V2V discharge resistance value, and thus determines to execute V2V discharge mode.

[0160] In the above technical solution, when the electric vehicle 400 is already connected to the charging and discharging device 300 and the electric vehicle 400 needs to change the charging and discharging mode executed by the charging and discharging device 300, the charging and discharging device 300 can first adjust the equivalent resistance value of the resistance conversion circuit 320 to the resistance value corresponding to the changed charging and discharging mode, and then use the switch unit 390 to change the resistance value of the pile-end CC interface 312 from infinite to the equivalent resistance value of the adjusted resistance conversion circuit 320. In this way, after the connection between the resistance conversion circuit 320 and the pile-end CC interface 312 is re-established, based on the process of the resistance value of the pile-end CC interface 312 changing from infinite to the equivalent resistance value of the adjusted resistance conversion circuit 320, the electric vehicle 400 can detect the resistance value of the pile-end CC interface 312, that is, the equivalent resistance value of the adjusted resistance conversion circuit 320, and implement the change of the charging and discharging mode based on the adjusted equivalent resistance value of the resistance conversion circuit 320.

[0161] Continuing to refer to FIG12 , in some embodiments, the charge-discharge device 300 may further include a pile-end connection confirmation circuit 3100. The pile-end connection confirmation circuit 3100 is connected to a pile-end CP interface 313, and the pile-end connection confirmation circuit 3100 is used to adjust the voltage of the pile-end CP interface 313. In a specific implementation, the number of the pile-end connection confirmation circuits 3100 may be multiple, and the multiple pile-end connection confirmation circuits 3100 correspond one-to-one to the multiple device interfaces 310, and each pile-end connection confirmation circuit 3100 is connected to the pile-end CP interface 313 in the corresponding device interface 310.

[0162] In some embodiments, taking the connection between the charging and discharging device 300 and the electric vehicle 400a as an example, the pile-end controller 340 is used to control the switch unit 390 to connect the other end of the resistance conversion circuit 320 to the pile-end CC interface 312 in response to a change in the voltage value of the pile-end CP interface 313, so that the electric vehicle 400a detects the adjusted equivalent resistance value of the resistance conversion circuit 320 through the pile-end CC interface 312, including:

[0163] The pile end controller 340 is used to:

[0164] In response to detecting a change in the voltage value of the pile-end CP interface 313, the pile-end connection confirmation circuit 3100 is controlled to adjust the voltage value of the pile-end CP interface 313, so that the electric vehicle 400a determines the equivalent resistance value of the resistance conversion circuit 320 after adjustment detected by the pile-end CC interface 312 according to the voltage value of the pile-end CP interface 313;

[0165] The control switch unit 390 turns on the connection between the other end of the resistance conversion circuit 320 and the pile-end CC interface 312 , so that the electric vehicle 400 a detects the adjusted equivalent resistance value of the resistance conversion circuit 320 through the pile-end CC interface 312 .

[0166] Specifically, when the electric vehicle 400a is changing from the current charging mode to the V2V discharging mode, if the pile-end controller 340 determines that the electric vehicle 400a has detected an infinite resistance value at the pile-end CC interface 312 based on a change in the voltage value detected at the pile-end CP interface 313, the pile-end controller 340 can first adjust the voltage value of the pile-end CP interface 313 via the pile-end connection confirmation circuit 3100 to simulate the disconnection and reconnection process between the pile-end CP interface 313 and the electric vehicle 400a. Specifically, in a specific implementation, the pile-end CP interface 313 is the CP plug in the charging and discharging gun plug, and the pile-end controller 340 adjusts the voltage value of the CP plug via the pile-end connection confirmation circuit 3100 to simulate the process of the charging and discharging gun plug being removed from the electric vehicle 400a and then reinserted. Afterwards, the pile-side controller 340 again switches on the connection between the resistance conversion circuit 320 and the pile-side CC interface 312 through the switch unit 390, so that the resistance value of the pile-side CC interface 312 changes from infinite to the equivalent resistance value of the resistance conversion circuit 320 after adjustment, i.e., the V2V discharge resistance value.

[0167] As a result, the electric vehicle 400a can be reinserted based on the simulated charge and discharge gun, and after the connection between the resistance conversion circuit 320 and the pile end CC interface 312 is restored, the resistance value of the pile end CC interface 312 is re-detected, that is, the equivalent resistance value of the adjusted resistance conversion circuit 320 is detected, and the charge and discharge mode is changed according to the adjusted equivalent resistance value of the resistance conversion circuit 320.

[0168] It should be understood that the specific process of adjusting the voltage value of the pile-end CP interface 313 by the pile-end connection confirmation circuit 3100 to simulate the disconnection and reconnection between the pile-end CP interface 313 and the electric vehicle 400a will be introduced below, and the above is only a brief description.

[0169] In the above technical solution, by simulating the process of disconnection and reconnection between the pile-end CP interface 313 and the electric vehicle 400a, the process of unplugging and reinserting the charging and discharging gun from the electric vehicle 400a is simulated. This helps to avoid the situation where, when the switch unit 390 disconnects the resistance conversion circuit 320 from the pile-end CC interface 312, the electric vehicle 400a mistakenly believes that there is a fault in the connection between the pile-end CC interface 312 and the electric vehicle 400a, and thus does not detect the resistance value of the pile-end CC interface 312 again.

[0170] It should be noted that the pile-end AC interface 311, the pile-end CC interface 312, the pile-end CP interface 313, the pile-end controller 340, and the pile-end connection confirmation circuit 3100 in the charging and discharging device 300 described in the above embodiment may also be referred to as an AC interface, a CC interface, a CP interface, and a controller, respectively.

[0171] The charging and discharging device 300 provided in the embodiment of the present application is introduced above with reference to the accompanying drawings. The charging and discharging system including the charging and discharging device 300 provided in the embodiment of the present application is introduced below with reference to the accompanying drawings.

[0172] FIG13 is a schematic structural diagram of a charging and discharging system 600 provided in an embodiment of the present application.

[0173] 13 , the charging and discharging system 600 includes the charging and discharging device 300 and the electric vehicle 400 described in the above embodiment.

[0174] The charging and discharging device 300 may include a charging station AC interface 311, a charging station CC interface 312, and a resistance conversion circuit 320. The electric vehicle 400 may include a vehicle-side AC interface 411 and a vehicle-side CC interface 412. One end of the resistance conversion circuit 320 is grounded, and the other end is connected to the charging station CC interface 312. The charging station AC interface 311 is used to connect to the vehicle-side AC interface 411, and the charging station CC interface 312 is used to connect to the vehicle-side CC interface 412.

[0175] Specifically, the charging and discharging device 300 may include multiple device interfaces 310, with a pile-end AC interface 311 and a pile-end CC interface 312 provided in each device interface 310. The electric vehicle 400 may include a vehicle interface 410, with a vehicle-end AC interface 411 and a vehicle-end CC interface 412 provided in the vehicle interface 410. Each device interface 310 is configured to connect to the vehicle interface 410 of the electric vehicle 400.

[0176] In one example, each device interface 310 may further include a pile-end PE interface, and the vehicle interface 410 may include a vehicle-end PE interface (not shown in the figure), wherein the pile-end PE interface is configured to connect to the vehicle-end PE interface. For a description of the pile-end PE interface, please refer to the description of the embodiment shown in FIG. 4 , which will not be repeated here.

[0177] For example, the charging and discharging device 300 may include multiple charging and discharging guns, the device interface 310 may be a charging and discharging gun plug in the charging and discharging gun, and the pile-end AC interface 311, the pile-end CC interface 312, and the pile-end PE interface may be the AC plug, CC plug, and PE plug in the charging and discharging gun plug. Accordingly, the vehicle interface 410 may be a vehicle socket provided in the electric vehicle 400, and the vehicle-end AC interface 411, the vehicle-end CC interface 412, and the vehicle-end PE interface may be the AC socket, CC socket, and PE socket in the vehicle socket, and are used to connect with the corresponding plugs in the charging and discharging gun plug.

[0178] Among them, the resistance conversion circuit 320 includes multiple switches and multiple resistors, and the multiple switches are used to adjust the equivalent resistance value of the resistance conversion circuit 320. The equivalent resistance value of the resistance conversion circuit 320 is used for the vehicle-end AC interface 411 to output AC power to the pile-end AC interface 311, or for the vehicle-end AC interface 411 to receive AC power output by the pile-end AC interface 311.

[0179] It is understood that in the embodiment of the present application, the equivalent resistance value of the resistance conversion circuit 320 may also refer to the resistance value of the pile-end CC interface 311 connected to the resistance conversion circuit 320. Furthermore, when the pile-end CC interface 311 and the vehicle-end CC interface 412 are connected, the resistance values ​​of the pile-end CC interface 311 and the vehicle-end CC interface 412 are the same. In other words, when the pile-end CC interface and the vehicle-end CC interface 412 are connected, the resistance values ​​of the pile-end CC interface 311 and the vehicle-end CC interface 412 are both the equivalent resistance value of the resistance conversion circuit 320.

[0180] It is also understood that in the embodiment of the present application, the charging and discharging device 300 corresponds to the charging mode and discharging mode of the electric vehicle 400 through the equivalent resistance values ​​of the resistance conversion circuit 320 of different sizes, that is, through the resistance values ​​of the pile end CC interface 312 of different sizes. For a detailed description, please refer to the relevant descriptions of the embodiments shown in Figures 4 to 12, and will not be repeated here.

[0181] In a specific implementation, as shown in FIG13 , an electric vehicle 400 may include a bidirectional onboard charger 420, a power battery 430, and a vehicle-side controller 440. The bidirectional onboard charger 420 is connected to the power battery 430, and the vehicle-side controller 440 is connected to the bidirectional onboard charger 420, the power battery 430, and the vehicle-side CC interface 412, respectively. The vehicle-side controller 440 can be configured to detect the resistance value of the vehicle-side CC interface 412 to determine the resistance value of the charging station CC interface 312 connected to the vehicle-side CC interface 412, thereby determining whether to execute a charging mode or a discharging mode. The bidirectional onboard charger 420 can be configured to convert the AC power output by the charging and discharging device 300 into DC power suitable for charging the power battery 430, thereby enabling the charging function of the electric vehicle 400. Alternatively, the bidirectional onboard charger 420 can also be configured to convert the DC power stored in the power battery 430 into AC power and output it to the charging and discharging device 300, thereby enabling the discharging function of the electric vehicle 400, such as V2V discharging.

[0182] In some embodiments, the charging and discharging device 300 may further include a pile-end controller 340, a switch unit 390, and a pile-end CP interface 313, and the electric vehicle 400 may further include a vehicle-end CP interface 413. One end of the resistance conversion circuit 320 is grounded, and the other end is connected to the pile-end CC interface 312 via the switch unit 390. The switch unit 390 is used to disconnect or connect the other end of the resistance conversion circuit 320 and the pile-end CC interface 312. The pile-end CP interface 313 is used to connect to the vehicle-end CP interface 413. The pile-end CP interface 313 can be specifically set in each device interface 310, and the vehicle-end CP interface can be specifically set in the vehicle interface 410.

[0183] In some embodiments, taking the connection between the charging and discharging device 300 and the electric vehicle 400a as an example, the pile end controller 340 can be used to:

[0184] When the pile-end AC interface 311 and the vehicle-end AC interface 411, the pile-end CC interface 312 and the vehicle-end CC interface 412, and the pile-end CP interface 313 and the vehicle-end CP interface 413 are all connected, adjust the equivalent resistance value of the resistance conversion circuit 320;

[0185] The control switch unit 390 disconnects the other end of the resistance conversion circuit 320 from the CC interface 312 .

[0186] The vehicle-side controller 440 may be configured to adjust the voltage value of the vehicle-side CP interface 413 in response to detecting a change in the resistance value of the vehicle-side CC interface 412 .

[0187] The pile-end controller 340 is further configured to: in response to a change in the voltage value of the pile-end CP interface 313, control the switch unit 390 to conduct the connection between the other end of the resistance conversion circuit 320 and the pile-end CC interface 312, so that the vehicle-end controller 440 detects the adjusted equivalent resistance value of the resistance conversion circuit 320 through the vehicle-end CC interface 412.

[0188] It is understandable that, in the embodiment of the present application, when the pile-end CP interface 313 and the vehicle-end CP interface 413 are connected, the voltage values ​​of the pile-end CP interface 313 and the vehicle-end CP interface 413 are the same.

[0189] Specifically, when the electric vehicle 400a is charged or discharged through the charging and discharging device 300, if it is necessary to change the charging and discharging mode executed by the electric vehicle 400a, for example, when the electric vehicle 400a determines to execute the charging mode by detecting the equivalent resistance value of the resistance conversion circuit 320, if it is necessary to change the electric vehicle 400a to execute the V2V discharge mode, the pile-end controller 340 first adjusts the equivalent resistance value of the resistance conversion circuit 320 from the current charging resistance value to the V2V discharge resistance value, and then controls the switch unit 390 to disconnect the other end of the resistance conversion circuit 320 from the pile-end CC interface 312, so that the resistance value of the pile-end CC interface 312, that is, the resistance value of the vehicle-end CC interface 412, becomes infinite.

[0190] When the vehicle-side controller 440 detects that the resistance value of the vehicle-side CC interface 412 is infinite, the vehicle-side controller 440 can respond by adjusting the voltage value of the vehicle-side CP interface 413, that is, adjusting the voltage value of the pile-side CP interface 313. Furthermore, based on the detected change in the voltage value of the pile-side CP interface 313, the charging and discharging device 300 determines that the vehicle-side controller 440 has detected that the resistance value of the pile-side CC interface 312 is infinite. It then controls the switch unit 390 to reconnect the connection between the other end of the resistance conversion circuit 320 and the pile-side CC interface 312, causing the resistance values ​​of the pile-side CC interface 312 and the vehicle-side CC interface 412 to change from infinite to the equivalent resistance value of the adjusted resistance conversion circuit 320, that is, to the V2V discharge resistance value. Thus, the vehicle-side controller 440 can detect that the resistance value of the vehicle-side CC interface 412 is now the V2V discharge resistance value and determine to execute the V2V discharge mode.

[0191] In the above technical solution, when the electric vehicle 400 is already connected to the charging and discharging device 300 and the electric vehicle 400 needs to change the charging and discharging mode executed by the charging and discharging device 300, the charging and discharging device 300 can first adjust the equivalent resistance value of the resistance conversion circuit 320 to correspond to the changed charging and discharging mode, and then, through the switch unit 390, change the resistance value of the pile-end CC interface 312, that is, the resistance value of the vehicle-end CC interface 412, from infinite to the equivalent resistance value of the adjusted resistance conversion circuit 320. In this way, based on the process of the resistance value of the vehicle-end CC interface 412 changing from infinite to the equivalent resistance value of the adjusted resistance conversion circuit 320, the vehicle-end controller 440 can detect the resistance value of the vehicle-end CC interface 412, that is, detect the equivalent resistance value of the adjusted resistance conversion circuit 320, and implement the change of the charging and discharging mode based on the adjusted equivalent resistance value of the resistance conversion circuit 320.

[0192] Furthermore, in some embodiments, the charging and discharging device 300 may further include a pile-end connection confirmation circuit 3100, and the electric vehicle 400 may further include a vehicle-end connection confirmation circuit 450. The pile-end connection confirmation circuit 3100 is connected to the pile-end CP interface 313 and is used to adjust the voltage value of the pile-end CP interface 313. The vehicle-end connection confirmation circuit 450 is connected to the vehicle-end CP interface 413 and is used to adjust the voltage value of the vehicle-end CP interface 413.

[0193] Taking the connection between the charging and discharging device 300 and the electric vehicle 400a as an example, the vehicle-side controller 440 can be used to adjust the voltage value of the vehicle-side CP interface 413 in response to detecting a change in the resistance value of the vehicle-side CC interface 412, including:

[0194] The vehicle-side controller 440 is used to:

[0195] In response to detecting a voltage change at the vehicle-side CC interface 412 , the vehicle-side connection confirmation circuit 450 is controlled to adjust the voltage at the vehicle-side CP interface 413 , ie, adjust the voltage at the pile-side CP interface 313 .

[0196] The pile-end controller 340 is further configured to control the switch unit 390 to conduct the connection between the other end of the resistance conversion circuit 320 and the pile-end CC interface 312 in response to a change in the voltage value of the pile-end CP interface 313, so that the vehicle-end controller 440 detects the adjusted equivalent resistance value of the resistance conversion circuit 320 through the vehicle-end CC interface 412, including:

[0197] The pile end controller 340 is also used for:

[0198] In response to detecting a change in the voltage value of the pile-end CP interface 313, the pile-end connection confirmation circuit 3100 is controlled to adjust the voltage value of the pile-end CP interface 313, that is, to adjust the voltage value of the vehicle-end CP interface 413, so that the vehicle-end controller 440 determines the equivalent resistance value of the resistance conversion circuit 320 after adjustment detected by the vehicle-end CC interface 412 according to the voltage value of the vehicle-end CP interface 413;

[0199] The control switch unit 390 switches on the connection between the other end of the resistance conversion circuit 320 and the pile-end CC interface 312 , so that the vehicle-end controller 440 detects the adjusted equivalent resistance value of the resistance conversion circuit 320 through the vehicle-end CC interface 412 .

[0200] Specifically, when the vehicle-side controller 440 changes from the currently executed charging mode to the V2V discharging mode, if the vehicle-side controller 440 detects that the resistance value of the vehicle-side CC interface 412 is infinite, the vehicle-side controller 440 can adjust the voltage value of the vehicle-side CP interface 413, that is, adjust the voltage value of the pile-side CP interface 313, in response via the vehicle-side connection confirmation circuit 450. When the pile-side controller 340 determines that the vehicle-side controller 440 has detected that the resistance value of the pile-side CC interface 312 is infinite based on the detected change in the voltage value of the pile-side CP interface 313, the pile-side controller 340 can first adjust the voltage value of the pile-side CP interface 313 via the pile-side connection confirmation circuit 3100 to simulate the process of disconnecting and reconnecting the pile-side CP interface 313 and the vehicle-side CP interface 413. Specifically, in a specific implementation, the pile-side CP interface 313 is the CP plug in the charging and discharging gun plug, and the vehicle-side CP interface 413 is the CP socket in the vehicle-side socket. The pile end controller 340 adjusts the voltage value of the CP plug through the pile end connection confirmation circuit 3100 to simulate the process of the charging and discharging gun plug being unplugged from the vehicle socket and then reinserted.

[0201] Afterward, the pile-side controller 340 reconnects the connection between the resistance conversion circuit 320 and the pile-side CC interface 312 via the switch unit 390, causing the resistance value of the pile-side CC interface 312, and thus the resistance value of the vehicle-side CC interface 412, to change from infinite to the adjusted equivalent resistance value of the resistance conversion circuit 320, i.e., the V2V discharge resistance value. Consequently, the vehicle-side controller 440 can detect that the resistance value of the vehicle-side CC interface 412 is now the V2V discharge resistance value and thus determine to execute the V2V discharge mode.

[0202] In the above technical solution, by simulating the process of disconnection and reconnection between the pile-end CP interface 313 and the vehicle-end CP interface 413, the process of unplugging and reinserting the charging and discharging gun from the vehicle socket is simulated. This helps to avoid the situation where, when the switch unit 390 disconnects the resistance conversion circuit 320 and the pile-end CC interface 312, the vehicle-end controller 440 mistakenly believes that the connection between the pile-end CC interface 312 and the vehicle-end CC interface 412 is faulty, and thus no longer detects the resistance value of the pile-end CC interface 312.

[0203] In the following, with reference to the accompanying drawings, the specific circuit structures of the pile-end connection confirmation circuit 3100 in the charging and discharging device 300 and the vehicle-end connection confirmation circuit 450 in the electric vehicle 400a are further illustrated by taking the connection between the electric vehicle 400a and the charging and discharging device 300 as an example.

[0204] FIG14 is a specific circuit structure diagram of a charging / discharging device 400's pile-end connection confirmation circuit 3100 and an electric vehicle 400a's vehicle-end connection confirmation circuit 450 provided in an embodiment of the present application.

[0205] In conjunction with Figures 13 and 14 , the charging gun plug shown in Figure 14 includes the device interface 310 shown in Figure 13 , and the vehicle socket shown in Figure 14 includes the vehicle interface 410 of the electric vehicle 400a shown in Figure 13 . The CC plug in the charging gun plug corresponds to the pile-end CC interface 312 in the device interface 310 , the CP plug in the charging gun plug corresponds to the pile-end CP interface 313 in the device interface 310 , and the PE plug in the charging gun plug corresponds to the pile-end PE interface in the device interface 310 . The CC socket in the vehicle socket corresponds to the vehicle-end CC interface 412 in the vehicle interface 410 , the CP socket in the vehicle socket corresponds to the vehicle-end CP interface 413 in the vehicle interface 410 , and the PE socket in the vehicle-end socket corresponds to the vehicle-end PE socket in the vehicle interface 410 .

[0206] The charging-end connection confirmation circuit 390 includes a first switch S5, a first resistor R9, and a voltage source U1. One end of the first switch S5 is connected to the voltage source U1, and the other end of the first switch S5 is connected to the CP plug via the first resistor R9. A detection point 1 is provided between the first resistor R9 and the CP plug. The voltage value at detection point 1 is the voltage value of the CP plug. The vehicle-end connection confirmation circuit 450 includes a second switch S6, a second resistor R10, and a third resistor R11. One end of the second resistor R10 is grounded via the second switch S6, and one end of the third resistor R11 is grounded. The other end of the second resistor R10 and the other end of the third resistor R11 are connected in parallel to the CP socket. A detection point 2 is provided between the parallel connection point of the other end of the second resistor R10 and the other end of the third resistor R11 and the CP socket. The voltage value at detection point 2 is the voltage value of the CP socket. When the charging-discharging gun plug is connected to the vehicle socket, the voltage values ​​of detection points 1 and 2 are the same.

[0207] The switch unit 390 includes a switch S k One end of the resistance conversion circuit 320 is grounded, and the other end is connected to the switch S K Connected to the CC plug. A detection point 3 is provided between the vehicle-side controller 440 and the CC socket. The resistance value of the detection point 3 is the resistance value of the CC socket.

[0208] When the charging / discharging gun plug is connected to the vehicle socket, the charging / discharging gun connection confirmation circuit 390 forms a loop with the vehicle-side connection confirmation circuit 390 through the CP plug and CP socket, and detection points 1 and 2 have the first voltage value. For electric vehicle 400a, if the vehicle-side controller 440 controls the second switch S6 to be disconnected, the voltage value of detection point 2 changes from the first voltage value to the second voltage value because the second resistor R10 no longer divides the voltage. Therefore, the vehicle-side connection confirmation circuit 450 adjusts the voltage value of detection point 2 by disconnecting the second switch S6, thereby adjusting the voltage value of detection point 1.

[0209] For the charging and discharging device 300, if the pile-end controller 340 controls the first switch S5 to be disconnected, the connection between the voltage source U1 and the first resistor R9 is disconnected, and the voltage value at detection point 1 changes from the second voltage value to zero. If the pile-end controller 340 controls the first switch S5 to be closed again, the connection between the voltage source U1 and the first resistor R9 is connected, and the voltage value at detection point 1 changes from zero to the second voltage value again. Thus, the pile-end connection confirmation circuit 3100 adjusts the voltage value at detection point 1, that is, adjusts the voltage value at detection point 2, by opening and closing the first switch S5, thereby simulating the process of disconnecting and reconnecting the CP plug and CP socket.

[0210] The following uses the example of a voltage source of 12V and equal resistance values ​​of the first resistor R9, the second resistor R10, and the third resistor R11 to illustrate how the electric vehicle 400a changes from the current charging mode to the V2V discharging mode.

[0211] When the electric vehicle 400a is in charging mode and receives the AC power output by the charging and discharging device 300, the charging and discharging plug is connected to the vehicle socket, and the switches of the charging resistance circuit 321 in the resistance conversion circuit 320 and the switch S k The V2G discharge resistor circuit 322, the V2L discharge resistor circuit 323, and the V2V discharge resistor circuit 324 in the resistance conversion circuit 320 are in the closed state. The equivalent resistance of the resistance conversion circuit 320 is the charging resistance value R2, that is, the resistance value at detection point 3 is R2. Furthermore, the pile-end connection confirmation circuit 3100 and the vehicle-end connection confirmation circuit 450 form a loop, and the first switch S5 and the second switch S6 are in the closed state. Due to the voltage divider function of the resistors, the voltage at detection points 1 and 2 is 6V at this time.

[0212] If the electric vehicle 400a needs to change to the V2V discharge mode, the pile end controller 340 responds to the changed discharge request of the electric vehicle 400a, controls the switches in the V2V discharge resistor circuit 324 to close, and controls the switches in the charging resistor circuit 321, the switches in the V2G discharge resistor circuit 322, the switches in the V2L discharge resistor circuit 323, and the switch S k At this time, the equivalent resistance value of the resistance conversion circuit 320 is V2V discharge resistance value R8. However, due to the switch S k Disconnected, so the resistance value of detection point 3 changes from R2 to infinity.

[0213] When the vehicle-end controller 440 detects that the resistance value of detection point 3 becomes infinite, the control switch S6 is disconnected. At this time, the voltage value of detection point 2 changes from 6V to 9V, that is, the voltage value of detection point 1 changes from 6V to 9V. The pile-end controller 340 determines that the vehicle-end controller 440 has detected that the resistance value of detection point 3 is infinite by detecting that the voltage value of detection point 1 changes from 6V to 9V. Afterwards, the pile-end controller 340 controls the first switch S5 to open and then close, so that the voltage value of detection point 2 changes from 9V to 0V, and then from 0V to 9V, to simulate the process of unplugging and reinserting the charging gun plug from the vehicle socket. In this way, the vehicle-end controller 440 can determine that the charging and discharging gun plug is reinserted into the vehicle socket based on the above-mentioned voltage value change detected at detection point 2, thereby determining to re-detect the resistance value of detection point 3.

[0214] Afterwards, the pile end controller 340 controls the switch S k The vehicle-side controller 440 detects the resistance value of detection point 3 and determines that the V2V discharge mode is in effect. After confirming the connection with the charging and discharging device 300, it controls the second switch S6 to close, causing the voltage between detection points 2 and 1 to change from 9V to 6V.

[0215] It can be understood that the specific circuit structures of the above-mentioned pile-end connection confirmation circuit 3100 and the vehicle-end connection confirmation circuit 450 are only for illustration. In the embodiment of the present application, as long as the pile-end connection confirmation circuit 3100 and the vehicle-end connection confirmation circuit 450 can adjust the voltage values ​​of the pile-end CP interface 313 and the vehicle-end CP interface 413 respectively, it will be sufficient.

[0216] It can also be understood that for details about the specific structure of the charging and discharging system 600 , reference can be made to the relevant contents of the embodiments shown in FIG. 3 to FIG. 12 , which will not be repeated here.

[0217] The above describes the charging and discharging device 300 provided in the embodiment of the present application, and the charging and discharging system 600 including the charging and discharging device 300. The following describes the charging and discharging method provided in the embodiment of the present application that can be applied to the charging and discharging device 300.

[0218] 15 is a flow chart of a charge-discharge method 700 provided in an embodiment of the present application. The charge-discharge method 700 may be executed by the charge-discharge device 300 , and specifically, may be executed by the pile-end controller 340 in the charge-discharge device 300 .

[0219] It should be understood that the description of the method embodiment may correspond to the description of the above-mentioned structural embodiment. Therefore, for the contents not described in detail, reference may be made to the above-mentioned device embodiment and will not be repeated below.

[0220] 15 , the charge and discharge method 700 may include:

[0221] S710: Receive an input instruction, where the input instruction is used to indicate a charging request or a discharging request of the electric vehicle.

[0222] Specifically, the input command can be a command inputted into the charging and discharging device by the owner of the electric vehicle through a human-machine interface provided by the charging and discharging device. Alternatively, the charging and discharging device can be communicatively connected to the terminal device via the platform, and the input command can be a command sent by the owner of the electric vehicle to the charging and discharging device through the terminal device.

[0223] S720, in response to the input instruction, adjusting the resistance value of the CC interface of the charging and discharging device, the resistance value of the CC interface is used for the electric vehicle to output AC power to the charging and discharging device, or for the electric vehicle to receive AC power output by the charging and discharging device.

[0224] It can be understood that the CC interface of the charging and discharging device can be the pile end CC interface 312 described in the above embodiment.

[0225] Specifically, with reference to the charging and discharging device 300 shown in FIG5 , the pile-end CC interface 312 of the charging and discharging device 300 is used to connect to the electric vehicle 400. One end of the resistance conversion circuit 320 in the charging and discharging device 300 is grounded, and the other end is connected to the pile-end CC interface 312. The resistance conversion circuit 320 includes multiple switches and multiple resistors. The pile-end controller 340 in the charging and discharging device 300 can adjust the equivalent resistance value of the resistance conversion circuit 320, i.e., adjust the resistance value of the pile-end CC interface 312, by controlling the on / off states of multiple switches in the resistance conversion circuit 320 according to input instructions, so that the electric vehicle 400 determines whether to execute the charging mode or the discharging mode by detecting the resistance value of the pile-end CC interface 312.

[0226] In the above technical solution, the charging and discharging device can adjust the resistance value of the CC interface of the charging and discharging device based on the charging request or discharging request of the electric vehicle, so that the electric vehicle determines whether to execute the charging mode or the discharging mode by detecting the resistance value of the CC interface, thereby realizing the charging and discharging functions of the electric vehicle. In addition, since the above charging and discharging method determines whether to execute the charging mode or the discharging mode of the electric vehicle by the resistance value of the CC interface of different sizes, the charging and discharging device can directly set the charging and discharging gun including the CC interface to enable the electric vehicle to determine the charging and discharging mode to be executed. This can avoid the need to replace the equipment of the electric vehicle during charging and discharging, and simplify the charging and discharging operations of the electric vehicle. In addition, the charging and discharging device provided in the embodiment of the present application does not need to be configured with a charging gun device and a discharging gun device at the same time, which can not only reduce the cost of the charging and discharging device, but also reduce the size of the charging and discharging device, making it easier to carry the charging and discharging device on the vehicle.

[0227] In a specific implementation, in some embodiments, in combination with the charging and discharging device 300 shown in Figure 5, S720, in response to an input instruction, adjusts the resistance value of the CC interface of the charging and discharging device, which may specifically include: in response to the input instruction, controlling the on and off states of multiple switches in the resistance conversion circuit 320 to adjust the equivalent resistance value of the resistance conversion circuit 320 to any one of the charging resistance value, the V2G discharge resistance value, the V2V discharge resistance value, and the V2L discharge resistance value.

[0228] Among them, the charging resistance value is used for electric vehicles to receive AC power output by charging and discharging equipment, the V2G discharge resistance value is used for electric vehicles to output AC power to charging and discharging equipment through V2G discharge mode, the V2V discharge resistance value is used for electric vehicles to output AC power to charging and discharging equipment through V2V discharge mode, and the V2L discharge resistance value is used for electric vehicles to output AC power to charging and discharging equipment through V2L discharge mode.

[0229] Specifically, in combination with the charging and discharging device 300 described in Figure 5, the pile-end controller 340 in the charging and discharging device 300 can adjust the equivalent resistance value of the resistance conversion circuit 320, that is, adjust the resistance value of the pile-end CC interface 312 to correspond to the charging mode, V2G discharge mode, V2V discharge mode or V2L discharge mode of the electric vehicle 400, based on the charging request indicated by the input instruction, or the discharge request of the electric vehicle indicated to execute the V2G discharge mode, the V2V discharge mode or the V2L discharge mode, so as to realize the charging function, V2G discharge function and V2V discharge function of the electric vehicle 400.

[0230] For a detailed description of how the charging and discharging device 300 adjusts the equivalent resistance value of the resistance conversion circuit 320 to correspond to the charging mode, V2G discharge mode, V2V discharge mode, or V2L discharge mode of the electric vehicle 400 to achieve the charging function, V2G discharge function, and V2V discharge function of the electric vehicle 400, please refer to the above embodiments and will not be repeated here.

[0231] In the above technical solution, based on the input instruction indicating that the electric vehicle requests charging or discharging, the equivalent resistance value of the resistance conversion circuit connected to the CC interface of the charging and discharging device can be adjusted so that the electric vehicle determines to execute the corresponding charging mode or discharging mode by detecting the resistance value of the CC interface, thereby meeting the different charging and discharging requirements of the electric vehicle.

[0232] Furthermore, even if an EV lacks V2V discharge capabilities, the charging and discharging equipment can adjust the resistance of the CC interface to a V2L discharge resistance, enabling the EV to output AC power to the AC interface based on the V2L discharge mode. The charging and discharging equipment then transmits the AC power output from the EV in V2L mode to other connected EVs, also enabling V2V discharge for the EV.

[0233] In some embodiments, when the electric vehicle is charged or discharged by the charging and discharging device, the electric vehicle and the charging and discharging device may interactively configure charging parameters or discharging parameters through PWM signals, and the electric vehicle may interactively configure charging parameters or discharging parameters through PWM signals.

[0234] For example, in one example, the charge and discharge method 700 may further include:

[0235] When the resistance value of the CC interface of the charging and discharging device is used for the electric vehicle to output AC power to the charging and discharging device, and the charging and discharging device outputs AC power to other electric vehicles, a power supply capability pulse width modulation (PWM) signal sent by the electric vehicle is received, and the power supply capability PWM signal is used to indicate the maximum output current value of the electric vehicle;

[0236] Sending a power supply capability PWM signal to the other electric vehicle, so that the other electric vehicle adjusts the maximum allowable input current value according to the power supply capability PWM signal;

[0237] Controlling the transmission of the alternating current output by the electric vehicle to the other electric vehicle.

[0238] Specifically, with reference to FIG5 , when electric vehicle 400a determines to execute a discharge mode (e.g., V2V discharge mode or V2L discharge mode) by detecting the resistance value of the AC interface 312 at the charging / discharging device 300, and electric vehicle 400b determines to execute a charging mode by detecting the resistance value of the AC interface 312 at the charging / discharging device 300, electric vehicle 400a may send a power supply capability PWM signal indicating the maximum output current value that it can currently provide to the charging / discharging device 300. The charging / discharging device 300 controller 340 further sends the power supply capability PWM signal to electric vehicle 400b. Electric vehicle 400b may determine the maximum output current value of electric vehicle 400a based on the duty cycle of the power supply capability PWM signal, and further compare the maximum output current value of electric vehicle 400a, the rated input current value of the bidirectional onboard charger in electric vehicle 400b, and the rated capacity of the cable connecting electric vehicle 400b and the charging / discharging device 300, and set the minimum of these values ​​as the maximum allowable input current value of electric vehicle 400b. That is, the electric vehicle 400 b receives the AC power outputted by the electric vehicle 400 a through the charging and discharging device 300 according to the configured maximum allowable input current value.

[0239] In the above technical solution, when an electric vehicle supplies power to other electric vehicles via a charging and discharging device, the charging and discharging device can transmit a PWM signal indicating the maximum output current value that the electric vehicle can provide to the other electric vehicles. In this way, the other electric vehicles can adjust their maximum allowable input current values ​​based on the PWM signal to ensure that the electric vehicle can supply power to the other electric vehicles normally through the charging and discharging device.

[0240] In other embodiments, when the electric vehicle is charged or discharged by the charging and discharging device, the electric vehicle and the charging and discharging device can be connected for communication and interactively configure charging parameters or discharging parameters through message transmission.

[0241] For example, in one example, the charge and discharge method 700 may further include:

[0242] When the resistance value of the CC interface of the charging and discharging device is used for the electric vehicle to output AC power to the charging and discharging device, and the charging and discharging device outputs AC power to other electric vehicles, a power supply capability message sent by the electric vehicle is received, and the power supply capability message is used to indicate the maximum output current value of the electric vehicle;

[0243] Sending the power supply capability message to the other electric vehicle, so that the other electric vehicle adjusts the maximum allowable input current value according to the power supply capability message;

[0244] Controlling the transmission of the alternating current output by the electric vehicle to the other electric vehicle.

[0245] It is understandable that the process of interactively configuring discharge parameters between electric vehicles connected to charging and discharging equipment and other electric vehicles through power supply capability messages is similar to the above-mentioned process of interactively configuring discharge parameters through power supply capability PWM signals, and will not be repeated here.

[0246] In the above technical solution, an electric vehicle can communicate with a charging and discharging device, for example, via a wireless connection. When an electric vehicle supplies power to other electric vehicles via the charging and discharging device, the charging and discharging device can send a power supply capability message indicating the maximum output current value that the electric vehicle can provide to the other electric vehicles. In this way, the other electric vehicles can adjust their maximum allowable input current values ​​based on this message to ensure that the electric vehicle can supply power to other electric vehicles through the charging and discharging device.

[0247] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A charging and discharging device, characterized in that: include: Resistance conversion circuit, connection confirmation CC interface and AC interface; One end of the resistance conversion circuit is grounded, and the other end of the resistance conversion circuit is connected to the CC interface, and the CC interface and the AC interface are used to connect to the electric vehicle; The resistance conversion circuit includes multiple switches and multiple resistors. The multiple switches are used to adjust the equivalent resistance value of the resistance conversion circuit. The equivalent resistance value of the resistance conversion circuit is used for the electric vehicle to output AC power to the AC interface, or for the electric vehicle to receive AC power output by the AC interface.

2. The charging and discharging device according to claim 1, characterized in that: The charging and discharging device further includes a controller, which is used for: In response to a charging request or a discharging request of the electric vehicle, controlling the on / off states of the plurality of switches in the resistance conversion circuit to adjust the equivalent resistance value of the resistance conversion circuit to any one of a charging resistance value, a vehicle-to-grid V2G discharge resistance value, a vehicle-to-vehicle V2V discharge resistance value, and a vehicle-to-load V2L discharge resistance value; Wherein, the charging resistance value is used for the AC interface to output AC power to the electric vehicle; The V2G discharge resistance value is used for the AC interface to receive the AC power output by the electric vehicle through the V2G discharge mode; The V2V discharge resistance value is used for the AC interface to receive the AC power output by the electric vehicle through the V2V discharge mode; The V2L discharge resistance value is used for the AC interface to receive the AC power output by the electric vehicle through the V2L discharge mode.

3. The charging and discharging device according to claim 2, characterized in that: The charging and discharging device also includes a switch unit and a control and guidance CP interface; The other end of the resistance conversion circuit is connected to the CC interface through the switch unit, and the CP interface is used to connect to the electric vehicle; The controller is also used for: When the AC interface, the CC interface and the CP interface are connected to the electric vehicle, adjusting the equivalent resistance value of the resistance conversion circuit; Controlling the switch unit to disconnect the other end of the resistance conversion circuit from the CC interface; In response to a change in the voltage value of the CP interface, the switch unit is controlled to conduct the connection between the other end of the resistance conversion circuit and the CC interface, so that the electric vehicle detects the adjusted equivalent resistance value of the resistance conversion circuit through the CC interface.

4. The charging and discharging device according to claim 3, characterized in that: The charging and discharging device further includes a connection confirmation circuit, the connection confirmation circuit is connected to the CP interface, and the connection confirmation circuit is used to adjust the voltage value of the CP interface; The controller is used to control the switch unit to conduct the connection between the other end of the resistance conversion circuit and the CC interface in response to the change in the voltage value of the CP interface, so that the electric vehicle detects the adjusted equivalent resistance value of the resistance conversion circuit through the CC interface, including: The controller is used to: In response to detecting a change in the voltage value of the CP interface, controlling the connection confirmation circuit to adjust the voltage value of the CP interface, so that the electric vehicle determines the equivalent resistance value of the resistance conversion circuit adjusted by the CC interface detection according to the voltage value of the CP interface; The switch unit is controlled to conduct the connection between the other end of the resistance conversion circuit and the CC interface, so that the electric vehicle detects the adjusted equivalent resistance value of the resistance conversion circuit through the CC interface.

5. The charging and discharging device according to claim 4, characterized in that: The connection confirmation circuit includes a first switch, a first resistor and a voltage source; One end of the first switch is connected to a voltage source, and the other end of the first switch is connected to the CP interface through the first resistor; The controller is used to control the connection confirmation circuit to adjust the voltage value of the CP interface in response to detecting a change in the voltage value of the CP interface, including: The controller is used to: In response to detecting a change in the voltage value of the CP interface, the first switch is controlled to be opened first and then closed to adjust the voltage value of the CP interface.

6. The charging and discharging device according to any one of claims 2 to 5, characterized in that: The charging and discharging device also includes a power transmission line; The power transmission line is used to transmit the AC power from the AC power grid to the electric vehicle connected to the AC interface; or to transmit the AC power output by the electric vehicle received by the AC interface to the AC power grid; The power transmission line is also used to transmit the alternating current output by the electric vehicle received by the alternating current interface to other electric vehicles connected to the charging and discharging device.

7. The charging and discharging device according to any one of claims 2 to 6, characterized in that: The charging and discharging equipment also includes an AC interface side electric meter; The AC interface side electric meter is used to measure the amount of AC power received by the AC interface and output by the electric vehicle, or to measure the amount of AC power output by the AC interface to the electric vehicle.

8. The charging and discharging device according to any one of claims 2 to 7, characterized in that: The controller is also used for: When the AC interface receives the AC power output by the electric vehicle through the V2L discharge mode or the V2V discharge mode, and the charging and discharging device outputs the AC power to the other connected electric vehicles, in response to the AC power output by the electric vehicle received by the AC interface being less than the charging demand power of the other electric vehicles, the AC power from the AC power grid and the AC power received by the AC interface are controlled to be transmitted to the other electric vehicles; or, In response to the AC power output by the electric vehicle received by the AC interface being greater than the charging demand power of the other electric vehicles, the AC power received by the AC interface is controlled to be transmitted to the AC power grid and the other electric vehicles.

9. A charging and discharging system, characterized in that: include: A charging and discharging device and an electric vehicle, wherein the charging and discharging device comprises a resistance conversion circuit, a pile-end connection confirmation CC interface and a pile-end AC interface, and the electric vehicle comprises a vehicle-end CC interface and a vehicle-end AC interface; wherein, One end of the resistance conversion circuit is grounded, and the other end of the resistance conversion circuit is connected to the pile end CC interface, the pile end CC interface is used to connect to the vehicle end CC interface, and the pile end AC interface is used to connect to the vehicle end AC interface; The resistance conversion circuit includes multiple switches and multiple resistors, and the multiple switches are used to adjust the equivalent resistance value of the resistance conversion circuit. The equivalent resistance value of the resistance conversion circuit is used for the vehicle-end AC interface to output AC power to the pile-end AC interface, or for the vehicle-end AC interface to receive the AC power output by the pile-end AC interface.

10. The charging and discharging system according to claim 9, characterized in that: The charging and discharging device further includes a pile end controller, which is used for: In response to a charging request or a discharging request of the electric vehicle, controlling the on / off states of the plurality of switches in the resistance conversion circuit to adjust the equivalent resistance value of the resistance conversion circuit to any one of a charging resistance value, a vehicle-to-grid V2G discharge resistance value, a vehicle-to-vehicle V2V discharge resistance value, and a vehicle-to-load V2L discharge resistance value; Wherein, the charging resistance value is used for the pile-end AC interface to output AC power to the vehicle-end AC interface; The V2G discharge resistance value is used for the pile-end AC interface to receive the AC power output by the vehicle-end AC interface through the V2G discharge mode; The V2V discharge resistance value is used for the pile-end AC interface to receive the AC power output by the vehicle-end AC interface through the V2V discharge mode; The V2L discharge resistance value is used for the pile-end AC interface to receive the AC power output by the vehicle-end AC interface through the V2L discharge mode.

11. The charging and discharging system according to claim 10, characterized in that: The charging and discharging device further includes a switch unit and a pile-end control and guidance CP interface, and the electric vehicle includes a vehicle-end CP interface and a vehicle-end controller; The other end of the resistance conversion circuit is connected to the pile end CC interface through the switch unit, and the pile end CP interface is used to connect to the vehicle end CP interface; The pile end controller is also used for: When the pile-end AC interface is connected to the vehicle-end AC interface, the pile-end CC interface is connected to the vehicle-end CC interface, and the pile-end CP interface is connected to the vehicle-end CP interface, adjusting the equivalent resistance value of the resistance conversion circuit; Controlling the switch unit to disconnect the other end of the resistance conversion circuit from the pile end CC interface to adjust the voltage value of the pile end CC interface; The vehicle-side controller is used for: In response to detecting a change in the resistance value of the pile-end CC interface, adjusting the voltage value of the vehicle-end CP interface; The pile end controller is also used for: In response to a change in the voltage value of the pile-end CP interface, the switch unit is controlled to conduct the connection between the other end of the resistance conversion circuit and the pile-end CC interface, so that the vehicle-end controller detects the adjusted equivalent resistance value of the resistance conversion circuit through the vehicle-end CC interface.

12. The charging and discharging system according to claim 11, characterized in that: The charging and discharging device further includes a pile-end connection confirmation circuit, and the electric vehicle further includes a vehicle-end connection confirmation circuit; The pile end connection confirmation circuit is connected to the pile end CP interface, and the pile end connection confirmation circuit is used to adjust the voltage value of the pile end CP interface; The vehicle-end connection confirmation circuit is connected to the vehicle-end CP interface, and the vehicle-end connection confirmation circuit is used to adjust the voltage value of the vehicle-end CP interface; The vehicle-side controller is used to adjust the voltage value of the vehicle-side CP interface in response to detecting a change in the resistance value of the vehicle-side CC interface, including: The vehicle-side controller is used for: In response to detecting a change in the resistance value of the vehicle-side CC interface, controlling the vehicle-side connection confirmation circuit to adjust the voltage value of the vehicle-side CP interface; The pile-end controller is also used to control the switch unit to conduct the connection between the other end of the resistance conversion circuit and the pile-end CC interface in response to the change in the voltage value of the pile-end CP interface, so that the vehicle-end controller detects the adjusted equivalent resistance value of the resistance conversion circuit through the vehicle-end CC interface, including: The pile end controller is used for: In response to detecting a change in the voltage value of the pile end CP interface, controlling the pile end connection confirmation circuit to adjust the voltage value of the pile end CP interface, so that the vehicle end controller determines the equivalent resistance value of the resistance conversion circuit adjusted by detecting the vehicle end CC interface according to the voltage value of the vehicle end CP interface; The switch unit is controlled to conduct the connection between the other end of the resistance conversion circuit and the pile end CC interface, so that the vehicle end controller detects the adjusted equivalent resistance value of the resistance conversion circuit through the vehicle end CC interface.

13. The charging and discharging system according to claim 12, characterized in that: The pile-end connection confirmation circuit includes a first switch, a first resistor and a voltage source, and the vehicle-end connection confirmation circuit includes a second switch, a second resistor and a third resistor; One end of the first switch is connected to a voltage source, and the other end of the first switch is connected to the pile end CP interface through the first resistor; One end of the second resistor is grounded through the second switch, one end of the third resistor is grounded, and the other end of the second resistor and the other end of the third resistor are connected in parallel to the vehicle-end CP interface; The vehicle-side controller is used to control the vehicle-side connection confirmation circuit to adjust the voltage value of the vehicle-side CP interface in response to detecting a change in the resistance value of the vehicle-side CC interface, including: The vehicle-side controller is used for: In response to detecting a change in the resistance value of the vehicle-end CC interface, controlling the second switch to be disconnected to adjust the voltage value of the pile-end CP interface; The pile end controller is used to control the pile end connection confirmation circuit to adjust the voltage value of the pile end CP interface in response to detecting a change in the voltage value of the pile end CP interface, including: The pile end controller is used for: In response to detecting a change in the voltage value of the pile-end CP interface, the first switch is controlled to be opened first and then closed to adjust the voltage value of the vehicle-end CP interface.

14. A charging and discharging method, characterized in that: include: receiving an input instruction, wherein the input instruction is used to indicate a charging request or a discharging request of the electric vehicle; In response to the input instruction, the resistance value of the connection confirmation CC interface of the charging and discharging device is adjusted, and the resistance value of the CC interface is used for the electric vehicle to output AC power to the charging and discharging device, or for the electric vehicle to receive AC power output by the charging and discharging device.

15. The charge and discharge method according to claim 14, characterized in that: The charging and discharging device comprises a resistance conversion circuit, one end of the resistance conversion circuit is grounded, the other end of the resistance conversion circuit is connected to the CC interface, and the resistance conversion circuit comprises a plurality of switches and a plurality of resistors; The step of adjusting the resistance value of the connection confirmation CC interface of the charging and discharging device in response to the input instruction includes: In response to the input instruction, controlling the on / off states of a plurality of switches in the resistance conversion circuit to adjust the equivalent resistance value of the resistance conversion circuit to any one of a charging resistance value, a vehicle-to-grid V2G discharge resistance value, a vehicle-to-vehicle V2V discharge resistance value, and a vehicle-to-load V2L discharge resistance value; Wherein, the charging resistance value is used for the electric vehicle to receive the alternating current output by the charging and discharging device; The V2G discharge resistance value is used for the electric vehicle to output AC power to the charging and discharging device through the V2G discharge mode; The V2V discharge resistance value is used for the electric vehicle to output AC power to the charging and discharging device through the V2V discharge mode; The V2L discharge resistance value is used for the electric vehicle to output AC power to the charging and discharging device through the V2L discharge mode.

16. The charge and discharge method according to claim 14 or 15, characterized in that: The charging and discharging method further comprises: When the resistance value of the CC interface is used for the electric vehicle to output AC power to the charging and discharging device, and the charging and discharging device outputs AC power to other electric vehicles, a power supply capability pulse width modulation PWM signal sent by the electric vehicle is received, and the power supply capability PWM signal is used to indicate the maximum output current value of the electric vehicle; Sending the power supply capability PWM signal to the other electric vehicles, so that the other electric vehicles adjust the maximum allowable input current value according to the power supply capability PWM signal; Controlling the transmission of the alternating current output by the electric vehicle to the other electric vehicles.

17. The charge and discharge method according to claim 14 or 15, characterized in that: The charging and discharging method further comprises: When the resistance value of the CC interface is used for the electric vehicle to output AC power to the charging and discharging device, and the charging and discharging device outputs AC power to other electric vehicles, a power supply capability message sent by the electric vehicle is received, and the power supply capability message is used to indicate the maximum output current value of the electric vehicle; Sending the power supply capability message to the other electric vehicles, so that the other electric vehicles adjust the maximum allowable input current value according to the power supply capability message; Controlling the transmission of the alternating current output by the electric vehicle to the other electric vehicles.

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