Charging apparatus, vehicle, and charging control method

Abstract

A charging apparatus, a vehicle, and a charging control method. The charging apparatus comprises a connector (31), a charging socket (32), a first switch circuit (33), a conversion circuit (34), and a controller (35). The connector (31) comprises a first connecting portion (311) and a second connecting portion (312). The first connecting portion is pluggably connected to an alternating current charging gun, and the second connecting portion is pluggably connected to the charging socket. The charging socket (32) is pluggably connected to a direct current charging gun, and receives electrical energy outputted by the direct current charging gun or the alternating current charging gun. The conversion circuit (34) is connected to the charging socket (32) by means of the first switch circuit (33), receives electrical energy outputted by the direct current charging gun or the alternating current charging gun, and converts the received electrical energy into a charging voltage for a power battery to charge the power battery. The controller (35) is used for identifying a device to which the direct current charging gun or the alternating current charging gun is connected when the charging socket is connected to the direct current charging gun and the alternating current charging gun, and controls the charging apparatus to charge the power battery when it is determined that the device to which the alternating current charging gun or the alternating current charging gun is connected is a power supply.

Description

Charging device, vehicle and charging control method Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a charging device, a vehicle, and a charging control method. Background Art

[0002] With the development of new energy technologies, new energy vehicles (NEVs) have received increasing attention. New energy vehicles are equipped with power batteries that receive and store electricity from charging stations and release the stored energy during driving, thereby driving the NEV.

[0003] Currently, new energy vehicles are mostly charged using AC charging piles and are equipped with internal charging devices for processing the electrical energy output by the AC charging piles. This charging device can convert the AC voltage output by the AC charging piles into a DC charging voltage for the power battery, thereby meeting the charging needs of new energy vehicles. In actual use, the power of the charging device is relatively low. In order to increase the charging speed of new energy vehicles, more and more new energy vehicles are adopting DC charging methods. In order to meet the needs of both DC charging and AC charging, new energy vehicles need to be equipped with two sets of charging devices to meet the charging needs of AC and DC charging scenarios. However, this configuration increases the charging cost of new energy vehicles and causes waste of internal space resources of new energy vehicles.

[0004] Summary of the Invention

[0005] The present application provides a charging device, a vehicle, and a charging control method for reducing the charging cost of the vehicle and the size of the charging device.

[0006] In a first aspect, embodiments of the present application provide a charging device that can be used in a vehicle, connected to a power battery in the vehicle, and used to charge the power battery. The charger includes at least: a connector, a charging socket, a first switching circuit, a conversion circuit, and a controller.

[0007] Among them, the connector includes a first connecting part and a second connecting part, the first connecting part is used for plugging and unplugging with the AC charging gun, and the second connecting part is used for plugging and unplugging with the charging socket; the charging socket is used for plugging and unplugging with the DC charging gun, and receiving the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the connector; the conversion circuit is connected to the charging socket through the first switching circuit, and is used to receive the DC power output by the DC charging gun or the AC power output by the AC charging gun, and convert the received electric energy into the charging voltage of the power battery in the vehicle to charge the power battery; the controller is used to identify the device connected to the DC charging gun or the AC charging gun when the DC charging gun is inserted into the charging socket or the AC charging gun is inserted into the connector, and when it is determined that the AC charging gun or the device connected to the AC charging gun is a power source, control the charger to charge the power battery.

[0008] Using this charger, an AC charging station can transmit AC power to the charger via the connector and charging socket, while a DC charging station can transmit DC power to the charger via the charging socket. Both AC and DC power are converted to the charging voltage of the power battery by the conversion circuit, and then used to charge the rechargeable battery. Therefore, both AC and DC charging stations can charge the power battery using the same charger, reducing the charging cost of the power battery and the size of the charger.

[0009] In one possible design, in order to enable the use of loads in outdoor scenarios, the controller in the charging device provided in the embodiment of the present application is also used to: when the charging socket is connected to a DC charging gun or is connected to an AC charging gun through a connector, and the device connected to the AC charging gun or the DC charging gun is a load, control the conversion circuit to convert the output voltage of the power battery into the supply voltage of the load and power the load.

[0010] In one possible design, when the DC power source or DC load connected to the charging socket has the same voltage amplitude as the power battery, the efficiency of the charging device is improved. The charging device also includes a second switching circuit connected between the charging socket and the power battery. When the second switching circuit is closed, an energy transmission path is formed between the device connected to the charging socket and the power battery, and energy is directly transmitted.

[0011] In one possible design, when the AC charging gun is inserted into the first connection part and the second connection part is inserted into the charging socket, the communication line in the AC charging gun is connected to the low-voltage auxiliary power line in the charging socket; when the DC charging gun is inserted into the charging socket, the communication line in the DC charging gun is connected to the communication line in the charging socket.

[0012] With this charging device, when the device is operating in either DC charging or DC discharging mode, devices connected to the charging socket can communicate with the device via the communication cable in the charging socket. When the device is operating in either AC charging or AC discharging mode, devices connected to the charging socket can communicate with the device via the low-voltage auxiliary power cable in the charging socket. Because separate cables are used for communication in DC and AC scenarios, the device can operate independently in both DC and AC scenarios.

[0013] In one possible design, the controller is specifically configured to identify a device connected to the DC charging gun or the AC charging gun based on a resistance value of a connection confirmation line in the charging socket.

[0014] In one possible design, when it is determined that the charging socket is connected to the AC charging gun through the connector, the charging power of the power battery or the power supply power of the load is determined based on the resistance of the connection confirmation line in the charging socket.

[0015] In one possible design, the conversion circuit includes: a first conversion module and a second conversion module.

[0016] Among them, the first end of the first conversion module is connected to the first switching circuit, and the second end of the first conversion module is connected to the first end of the second conversion module; the second end of the second conversion module is used to connect to the power battery; the first conversion module is used to rectify the AC power output by the charging socket and output it to the second conversion module, and when receiving the DC power output by the charging socket, the DC power is voltage-regulated and output to the second conversion module; the second conversion module is used to receive the electric energy output by the first conversion module, convert the received electric energy into the charging voltage of the power battery, and charge the power battery; the second conversion module is also used to voltage-regulate the DC power output by the power battery and output it to the first conversion module; the first conversion module is also used to receive the electric energy output by the second conversion module, convert the received electric energy into the power supply voltage of the load and power the load.

[0017] In one possible design, the vehicle's motor is powered by AC power, while the power battery stores DC power. Therefore, a three-phase bridge arm for power conversion is provided between the motor's three-phase winding and the power battery. To reduce the cost of the charging device, the motor's three-phase winding and three-phase bridge arm can be reused as a first conversion module. The first conversion module includes the vehicle's motor's three-phase winding, a three-phase converter connected to the three-phase winding, and a single-phase bridge arm. The second conversion module includes a voltage regulation circuit.

[0018] In one possible design, when the vehicle is operating in drive mode, the voltage regulator circuit regulates the voltage output by the power battery and outputs it to the three-phase converter. The three-phase converter also converts the electrical energy output by the second converter into three-phase AC power and outputs it to the three-phase winding. With this charging device structure, when the vehicle is operating in drive mode, as the power battery voltage decreases with use, the second conversion module can also output the voltage required for motor operation, thereby ensuring smooth motor operation.

[0019] In one possible design, the charging socket is equipped with an electronic locking assembly. This assembly locks the battery when the second connection is plugged into the charging socket and the AC charging gun is plugged into the first connection. If the charging current of the power battery exceeds a set current, the electronic locking assembly locks the battery. The connector is also equipped with a mechanical locking assembly. When the AC charging gun is plugged into the first connection, the mechanical locking assembly locks the battery. This charging device structure, when both the electronic and mechanical locking assemblies are locked, effectively prevents electric shock accidents caused by accidentally unplugging the AC charging gun during AC charging scenarios.

[0020] In one possible design, the electronic locking assembly is further configured to lock the charger when the second connector is plugged into the charging socket and the AC charging plug is plugged into the first connector. This charging device structure, when both the electronic locking assembly and the mechanical locking assembly are locked, effectively prevents electric shock accidents caused by someone accidentally unplugging the AC charging plug during AC discharge.

[0021] In a second aspect, an embodiment of the present application provides a vehicle comprising a power battery and a charging device.

[0022] Among them, the charging device includes: a connector, a charging socket, a first switching circuit, a conversion circuit and a controller; the connector includes a first connecting part and a second connecting part, the first connecting part is used to plug and unplug the AC charging gun, and the second connecting part is used to plug and unplug the charging socket; the charging socket is used to plug and unplug the DC charging gun, and receive the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the connector; the conversion circuit is connected to the charging socket through the first switching circuit, and is used to receive the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the first plug part, and convert the received electric energy into the charging voltage of the power battery to charge the power battery; the controller is used to identify the device connected to the DC charging gun or the AC charging gun when the DC charging gun is inserted into the charging socket or the AC charging gun is inserted into the connector, and when it is determined that the AC charging gun or the device connected to the AC charging gun is a power source, control the charging device to charge the power battery.

[0023] In one possible design, the controller is also used to: when a DC charging gun is inserted into a charging socket or an AC charging gun is inserted into a connector, and the device connected to the AC charging gun or DC charging gun is a load, control the conversion circuit to convert the output voltage of the power battery into the supply voltage of the load and power the load.

[0024] In a possible design, the charging device further includes a second switch circuit connected between the charging socket and the power battery.

[0025] In one possible design, when the AC charging gun is inserted into the first connection part and the second connection part is inserted into the charging socket, the communication line in the AC charging gun is connected to the backup power line in the charging socket; when the DC charging gun is inserted into the charging socket, the communication line in the DC charging gun is connected to the communication line in the charging socket.

[0026] In one possible design, the controller is specifically configured to determine a device connected to the DC charging gun or the AC charging gun based on a resistance value of a connection confirmation line in the charging socket.

[0027] On the third aspect, an embodiment of the present application provides a charging control method, which can be applied to a vehicle. The vehicle includes a power battery and a charging device. The charging device includes a connector, a charging socket, a first switching circuit, a conversion circuit and a controller. The connector includes a first connection part and a second connection part. The first connection part is used for plugging and unplugging with an AC charging gun, and the second connection part is used for plugging and unplugging with a charging socket. The charging socket is used for plugging and unplugging with a DC charging gun, and the conversion circuit is connected to the charging socket through the first switching circuit.

[0028] Specifically, the charging control method includes the following steps: detecting the connection status of the charging socket; when determining that the charging socket is plugged into a DC charging gun or plugged into an AC charging gun through a connector, detecting the resistance of the connection confirmation line in the AC charging socket; determining the target operating mode of the charging device based on the resistance value, and controlling the charging device to operate in the target mode, the operating modes including DC charging mode and AC charging mode.

[0029] In one possible design, controlling the charging device to operate in a target mode includes: when determining that the target operating mode is a DC charging mode, controlling the conversion circuit to convert the electrical energy output by the DC charging gun into a charging voltage of a power battery in the vehicle and charging the power battery.

[0030] In one possible design, controlling the charging device to operate in a target mode includes: when determining that the target operating mode is the AC charging mode, controlling the conversion circuit to convert the electrical energy output by the AC charging gun into a charging voltage of a power battery in the vehicle and charging the power battery.

[0031] In one possible design, the operating mode also includes a DC discharge mode and an AC discharge mode, and the charging device is controlled to operate in a target mode, including: when it is determined that the target operating mode is the DC discharge mode, controlling the conversion circuit to convert the voltage output by the power battery into the supply voltage of the load, and supplying power to the load through the charging socket.

[0032] In one possible design, the operating mode also includes a DC discharge mode and an AC discharge mode, and the charging device is controlled to operate in a target mode, including: when the target operating mode is determined to be the AC discharge mode, controlling the conversion circuit to convert the voltage output by the power battery into the supply voltage of the load, and supplying power to the load through the connector.

[0033] In one possible design, detecting the connection status of the charging socket includes: detecting the voltage amplitude of the low-voltage auxiliary power line in the charging socket; when it is determined that the voltage of the backup power line is greater than or equal to the set voltage value, determining that the charging socket is connected to the DC charging gun or connected to the AC charging gun through a connector.

[0034] In one possible design, the charging control method provided in an embodiment of the present application also includes: when it is determined that the charging device is operating in an AC charging mode, controlling the locking component in the charging device to be in a locked state; determining the charging power of the power battery based on the resistance value of the connection confirmation line in the charging socket; and based on the charging power, controlling the conversion circuit to convert the electric energy output by the AC charging gun into a charging voltage for the power battery, and charging the power battery.

[0035] In one possible design, the charging control method provided in the embodiment of the present application further includes: controlling the locking assembly within the charging device to be in a locked state when determining that the charging device is operating in the AC discharge mode; determining the power supply of the load based on the resistance of the connection confirmation line in the charging socket; and controlling the conversion circuit to convert the electrical energy output by the power battery into the power supply voltage of the load based on the power supply power, and supplying power to the load. It should be noted that the beneficial effects of each design of the second aspect of the embodiment of the present application can be referred to the beneficial effects of any possible design of the first aspect above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic diagram of a vehicle structure provided in an embodiment of the present application;

[0037] FIG2 is a first schematic diagram of vehicle charging provided by an embodiment of the present application;

[0038] FIG3 is a structural schematic diagram 1 of a charging device provided in an embodiment of the present application;

[0039] FIG4 is a second schematic diagram of vehicle charging provided in an embodiment of the present application;

[0040] FIG5 is a structural diagram 1 of a conversion circuit provided in an embodiment of the present application;

[0041] FIG6 is a second structural diagram of a conversion circuit provided in an embodiment of the present application;

[0042] FIG7 is a third structural diagram of a conversion circuit provided in an embodiment of the present application;

[0043] FIG8 is a second structural diagram of a charging device provided in an embodiment of the present application;

[0044] FIG9 is a connection diagram of a connector provided in an embodiment of the present application;

[0045] FIG10 is a communication diagram of a vehicle provided in an embodiment of the present application;

[0046] FIG11 is a flow chart of a charging control method according to an embodiment of the present application;

[0047] FIG12 is a second flow chart of a charging control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The terms used in the implementation methods of this application are only used to explain the specific embodiments of the present application and are not intended to limit this application. Obviously, the embodiments described are only some embodiments of the present application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application as detailed in the appended claims.

[0050] Below, some terms used in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0051] (1) In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar to it.

[0052] (2) The switch tube in the embodiment of the present application may be one or more of various types of switch tubes such as a relay, a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) transistor, etc., which are not listed one by one in the embodiment of the present application. The packaging form of each switch tube may be a single tube package or a multi-tube package, which is not limited in the embodiment of the present application. Each switch tube may include a first end, a second end and a control end, wherein the control end is used to control the conduction or disconnection of the switch tube. When the switch tube is turned on, current can be transmitted between the first end and the second end of the switch tube, and when the switch tube is turned off, current cannot be transmitted between the first end and the second end of the switch tube. Taking MOSFET as an example, the control end of the switch tube is the gate, the first end of the switch tube may be the source, and the second end may be the drain, or the first end may be the drain, and the second end may be the source.

[0053] (3) In the embodiments of the present application, “connection” can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, the connection between A and B can also be a direct connection between A and C, and C and B can be directly connected, with A and B connected through C. The “connection” in the embodiments of the present application can also be understood as a wireless connection, that is, the connection between two electrical components can be an electromagnetic connection between the two electrical components.

[0054] (4) Direct current and alternating current. Direct current in the embodiments of the present application refers to an electrical form in which electric energy is conducted in a circuit in a constant direction. The conduction direction of electric energy is also called phase, and the phase of direct current can be positive or negative. The electric energy intensity of most direct currents is fixed. In some special direct currents (such as pulsed direct current), the electric energy intensity will also change with time. The electric energy intensity is also called current amplitude. Common direct current power sources include dry cells, storage batteries or direct current generators. Alternating current in the embodiments of the present application refers to an electrical form in which electric energy is conducted in a circuit in a periodically changing direction. The electric energy intensity of most alternating currents will also change periodically with time. The periodic change in the conduction direction of alternating current is limited by the frequency of alternating current. When the frequency of alternating current is higher, the alternating current can change the conduction direction faster, and when the frequency of alternating current is lower, the alternating current can change the conduction direction slowly. Common alternating current power sources include mains electricity, industrial and agricultural power supplies, residential power supplies, etc.

[0055] (5) Rectification and Inversion: Rectification in the embodiments of the present application refers to converting AC power into DC power, and inversion refers to converting AC power into DC power.

[0056] (6) Connection confirm (CC) signal: This is a functional signal that electronically indicates the status of the vehicle's charging port or discharge port being connected to the device. The port used to transmit the CC signal is the CC port. Based on the provisions of the "Electric Vehicle Conductive Power Supply System Standard", for vehicles, the vehicle determines the type of device and the type of cable between the device and the vehicle by comparing the resistance value of the CC interface.

[0057] The solution disclosed in the present application can be applied to electric devices that use batteries as power supply sources, and to control the charging of batteries in electric devices. The electric devices include, but are not limited to, vehicles, robots, industrial equipment, smart factory equipment, and the like. The vehicles provided in the embodiments of the present application may include one or more different types of vehicles or movable objects that operate or move on land (e.g., highways, roads, railways, etc.), on water (e.g., waterways, rivers, oceans, etc.), or in space. For example, vehicles may include vehicles, bicycles, motorcycles, trains, subways, airplanes, ships, aircraft, or other types of vehicles or movable objects.

[0058] In the following, the vehicle is taken as an example. The vehicle provided in the embodiment of the present application is a new energy vehicle, which can be a pure electric vehicle (pure electric vehicle / battery electric vehicle, pure EV / battery EV), a hybrid electric vehicle (hybrid electric vehicle, HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV) or other new energy vehicles (NEV), etc.

[0059] To facilitate understanding of the charger, vehicle, and charging control method provided in the embodiments of the present application, the following first introduces the application scenarios of the charging equipment.

[0060] 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, represented by electric and hybrid vehicles, is a key measure for achieving energy conservation, emission reduction, and pollution prevention. Electric vehicles, by replacing fuel engines with electric motors, not only achieve zero emissions, low noise, and zero pollution, but also significantly conserve increasingly depleted petroleum resources. Hybrid vehicles, on the other hand, utilize both the long range and high power of the engine and the low noise and pollution-free nature of the electric motor. With the increasing maturity and development of power battery technology, new energy vehicles are poised to become a major trend in the future development of the automotive industry.

[0061] Figure 1 is a schematic diagram of a vehicle architecture. Vehicle 10 may be a new energy vehicle. As shown in Figure 1 , vehicle 10 may include a power battery 11, a motor 12, wheels 13, and a charging device. Power battery 11 may be a large-capacity, high-power storage battery. Power battery 11 may power motor 12. Motor 12 converts the electrical energy provided by power battery 11 into mechanical energy and drives wheels 13 to rotate, thereby driving vehicle 10. Charging device 14 may charge power battery 11 to ensure that the power level in power battery 11 meets the vehicle's operating requirements.

[0062] As shown in Figure 1 , a power battery 11 in a vehicle 10 provides the power required to drive the vehicle. To enhance the user experience, the vehicle 10 is typically equipped with loads such as entertainment functions, which gradually increases the power consumption of the vehicle 10. As the power battery capacity increases, the charging requirements for the power battery 11 also gradually increase.

[0063] Figure 2 is a schematic diagram of charging a vehicle 10. As shown in Figure 2 , the vehicle 10 can charge its power battery via a charging station 20. The vehicle 10 is equipped with a charging socket 15. The charging station 20 is connected to a charging gun 22 via a cable 21. When the charging gun 22 is plugged into the charging socket 15 of the vehicle 10, a charging circuit is established between the charging station 20 and the vehicle 10. The charging station 20 can use this charging circuit to charge the power battery in the vehicle 10.

[0064] Currently, the charging piles 20 used to charge the vehicle 10 are mainly divided into DC charging piles and AC charging piles. The DC charging pile can be connected to the DC charging gun via a cable. When the vehicle 10 is charged using the DC charging pile, the operator can insert the DC charging gun into the charging socket of the vehicle 10. The vehicle 10 needs to be equipped with a corresponding charging device inside. This charging device can receive the DC power output by the DC charging pile through the charging socket 15, convert the amplitude of the received DC power into the charging voltage of the power battery, and charge the power battery. The AC charging pile can be connected to the AC charging gun via a cable. When the vehicle 10 is charged using the AC charging pile, the operator can insert the AC charging gun into the charging socket 15 of the vehicle 10. The vehicle 10 needs to be equipped with a corresponding charging device inside. This charging device can receive the AC power output by the AC charging pile through the charging socket 15, convert the received AC power into DC power, and convert the amplitude of the DC power into the charging voltage of the power battery, thereby charging the power battery.

[0065] In actual applications, since AC charging piles and DC charging piles output different types of electricity and may also have different amplitudes, in order to meet the charging needs of the vehicle in different scenarios, two sets of charging devices and corresponding charging sockets for each charging device need to be configured inside the vehicle. This design greatly increases the charging cost of the vehicle, and the two additional charging devices will also occupy the interior space of the vehicle, affecting the installation of other devices in the vehicle.

[0066] To address the above issues, embodiments of the present application provide a charging device, a vehicle, and a charging control method for meeting the charging needs of the vehicle in both AC and DC charging scenarios, while reducing the charging costs of the vehicle. The following describes the charging device in conjunction with specific embodiments.

[0067] As shown in Figure 3, the charging device 30 may include a connector 31, a charging socket 32, a first switching circuit 33, a conversion circuit 34, and a controller 35. The charging device 30 may be used in a vehicle, connected to the power battery in the vehicle, and charging the power battery, thereby charging the power battery in the vehicle.

[0068] The connector 31 includes a first connection portion 311 and a second connection portion 312. The first connection portion can be plugged and unplugged into an AC charging cable, and the second connection portion can be plugged and unplugged into a charging socket 32. The charging socket 32 ​​can also be plugged and unplugged into a DC charging cable. The conversion circuit 34 is connected to the vehicle's power battery and to the charging socket 32 ​​via a first switching circuit 33. It should be noted that since the connector 31 can be plugged and unplugged into other devices, it can be carried in the vehicle.

[0069] In actual use, the charging socket 32 ​​can be mounted on the vehicle's exterior and connected to the vehicle's power battery via the first switching circuit 33 and conversion circuit 34 within the charging device 30. When an AC charging gun is plugged into the first connection portion 311 of the connector 31, and the second connection portion 312 of the connector 31 is plugged into the charging socket 32, the AC power source connected to the AC charging gun establishes an electrical connection with the power battery connected to the charging device 30. When a DC charging gun is plugged into the charging socket 32, the DC power source connected to the DC charging gun establishes an electrical connection with the power battery.

[0070] The AC power source can be an AC charging station or a portable charger, and the DC power source can be a DC charging station or a portable charger. The AC power source or DC power source can also be another vehicle. For example, as shown in Figure 4, two vehicles can be connected via an AC charging gun or a DC charging gun. In this case, the vehicle with a larger power battery capacity can serve as the power source. The DC charging gun or AC charging gun between the two vehicles transmits electrical energy to the vehicle with a smaller power battery capacity. The charging device in the vehicle then converts the electrical energy into the charging voltage of the power battery, thereby charging the power battery.

[0071] Generally, the charging device 30 has two working modes, namely charging mode and discharging mode. When the charging device 30 works in the sub-ampere charging mode, one end of the charging device 30 is connected to the power source, and the other end is connected to the power battery. The charging device 30 can convert the electric energy output by the power source into the charging voltage of the power battery and charge the power battery. When the charging device 30 works in the discharge mode, one end of the charging device 30 is connected to the load, and the other end is connected to the power battery. The charging device 30 can convert the electric energy stored in the power battery into the supply voltage of the load and supply power to the load. According to the type of electric energy output by the power source and the type of electric energy supplied to the load, the working mode of the charging device 30 can be specifically divided into AC charging mode, DC charging mode, AC discharge mode and DC discharge mode.

[0072] Specifically, when an AC charging gun is inserted into the first connection portion 311 of the connector 31 and the second connection portion 312 of the connector 31 is inserted into the charging socket 32, if the AC charging gun is connected to an AC power source, the charging device 30 enters AC charging mode. The conversion circuit 34 converts the AC power output from the AC power source through the AC charging gun into the charging voltage of the vehicle's power battery to charge the power battery. If the AC charging gun is connected to an AC load powered by AC power, the charging device 30 enters AC discharging mode. The conversion circuit 34 converts the electrical energy output from the power battery into the supply voltage of the AC load, and then powers the AC load through the AC charging gun. Similarly, when a DC charging gun is inserted into the charging socket 32, if the DC charging gun is connected to a DC power source, the charging device 30 enters DC charging mode. The conversion circuit 34 converts the DC power output from the DC power source through the DC charging gun into the charging voltage of the vehicle's power battery to charge the power battery. If the device connected to the DC charging gun is a DC load powered by DC power, the charging device 30 enters the DC discharge mode, and the conversion circuit 34 can convert the electric energy output by the power battery into the supply voltage of the DC load and power the DC load through the DC charging gun.

[0073] Next, the working mode of the charging device 30 is further described in conjunction with the structure of the conversion circuit 34. Figure 5 exemplarily shows a schematic diagram of the structure of the conversion circuit 34. As shown in Figure 5, the conversion circuit 34 may include a first conversion module 341 and a second conversion module 342.

[0074] The first conversion module 341 may include a first end and a second end, and the second conversion module 342 may include a third end and a fourth end. The first end of the first conversion module 341 is connected to the charging socket 32 ​​via the first switch circuit 33, the second end of the first conversion module 341 is connected to the third end of the second conversion module 342, and the fourth end of the second conversion module 342 is connected to the power battery in the vehicle.

[0075] Using the conversion circuit 34 shown in Figure 5, when the charging device 30 operates in AC charging mode, that is, using an AC power source connected to an AC charging plug to charge the power battery, the operator inserts the AC charging plug into the first connection portion 311 of the connector 31 and the second connection portion 312 of the connector 31 into the charging socket 32. The AC power output from the AC power source is transmitted to the conversion circuit via the charging socket and the first switching circuit. In this case, the first terminal can be considered the input terminal of the first conversion module 341, the second terminal can be considered the output terminal of the first conversion module 341, the third terminal can be considered the input terminal of the second conversion module 342, and the fourth terminal can be considered the output terminal of the second conversion module 342. The first conversion module 341 performs a rectification operation, receiving the AC power output from the AC power source through the first terminal, rectifying the received AC power, and outputting it to the second conversion module 342 through the second terminal. The second conversion module 342 performs a voltage regulation operation, receiving the power output from the first conversion module 341 through the third terminal, converting the received power into a charging voltage for the power battery, and outputting it to the power battery through the fourth terminal, thereby charging the power battery.

[0076] Using the conversion circuit 34 shown in Figure 5, when the charging device 30 operates in AC discharge mode, that is, using the power battery to power the AC load connected to the AC charging gun, the operator can plug the AC charging gun into the first connection portion 311 of the connector 31 and the second connection portion 312 of the connector 31 into the charging socket 32. The AC load is connected to the conversion circuit 34 through the charging socket 32 ​​and the first switch circuit 33. In this case, the first terminal can be considered the output terminal of the first conversion module 341, the second terminal can be considered the input terminal of the first conversion module 341, the third terminal can be considered the output terminal of the second conversion module 342, and the fourth terminal can be considered the input terminal of the second conversion module 342. The second conversion module 342 performs a voltage regulation operation, receiving the DC power output from the power battery through the fourth terminal, regulating the voltage amplitude of the received DC power, and outputting it to the first conversion module 341 through the third terminal. The first conversion module 341 performs an inversion operation, and can receive the direct current output by the second conversion module 342 through the second end, invert the received direct current into alternating current, and output it to the AC load through the first switching circuit 33 and the charging socket 32 ​​connected to the first end, thereby powering the AC load.

[0077] Using the conversion circuit 34 shown in FIG5 , when the charging device 30 operates in DC charging mode, that is, using a DC power supply connected to a DC charging gun to charge the power battery, the operator can plug the DC charging gun into the charging socket 32 ​​of the charging device 30. The DC power output by the DC power supply can be output to the conversion circuit 34 through the charging socket 32 ​​and the first switching circuit 33. In this case, the first terminal can be considered the input terminal of the first conversion module 341, the second terminal can be considered the output terminal of the first conversion module 341, the third terminal can be considered the input terminal of the second conversion module 342, and the fourth terminal can be considered the output terminal of the second conversion module 342. The first conversion module 341 performs a first voltage regulation operation, receiving the DC power output from the DC power supply through the first terminal, performing a first voltage regulation on the DC power supply, and outputting it to the second conversion module 342 through the second terminal. The second conversion module 342 performs a second voltage regulation operation, receiving the power output from the first conversion module 341 through the third terminal, adjusting the voltage amplitude of the received power to the charging voltage of the power battery, and outputting it to the power battery through the fourth terminal, thereby charging the power battery.

[0078] Using the conversion circuit 34 shown in Figure 5, when the charging device 30 operates in DC discharge mode, that is, using the power battery to power the DC load connected to the DC charging gun, the operator can plug the DC charging gun into the charging socket 32 ​​of the charging device 30. The DC load is connected to the conversion circuit 34 through the charging socket 32 ​​and the first switch circuit 33. In this case, the first terminal can be considered the output terminal of the first conversion module 341, the second terminal can be considered the input terminal of the first conversion module 341, the third terminal can be considered the output terminal of the second conversion module 342, and the fourth terminal can be considered the input terminal of the second conversion module 342. The second conversion module 342 performs a first voltage regulation operation, receiving the DC power output from the power battery through the second terminal, performing a first voltage regulation on the voltage amplitude of the received DC power, and outputting it to the first conversion module 341 through the third terminal. The first conversion module 341 performs a second voltage regulation operation, receiving the DC power output from the second conversion module 342 through the second terminal, adjusting the voltage amplitude of the received DC power to the supply voltage of the DC load, and outputting it to the DC load through the first switch circuit and the charging socket 32 ​​connected to the first terminal, thereby powering the DC load.

[0079] In one possible implementation, when the charging device 30 operates in the AC charging mode, if the effective value of the AC power output by the AC power source is the same as the voltage amplitude of the power battery, the conversion circuit 34 may only have a rectification function and not a voltage regulation function, that is, the second conversion module 342 is only used for power transmission. Similarly, when the charging device 30 operates in the AC discharging mode, if the effective value of the supply voltage of the AC load is the same as the voltage amplitude of the power battery, the conversion circuit 34 may only have an inversion function and not a voltage regulation function, that is, the second conversion module 342 is only used for power transmission.

[0080] In one example, since a three-phase bridge arm is generally connected between the three-phase winding of the motor in the vehicle and the power battery, the three-phase bridge arm can convert the direct current output by the power battery into the alternating current required for the operation of the motor. In order to reduce the charging cost of the vehicle, the first conversion module 341 in the charging device 30 can reuse the three-phase winding of the motor and the three-phase bridge arm connected to the three-phase winding. In addition to the above-mentioned three-phase winding and the three-phase bridge arm connected to the three-phase winding, the first conversion module 341 also includes a single-phase bridge arm. The three-phase bridge arm is connected in parallel with the single-phase bridge arm, and the middle node of the three-phase bridge arm is connected to an interface of the first end through the three-phase winding, and the middle node of the single-phase bridge arm is connected to another interface of the first end.

[0081] In actual use, the three-phase bridge arm connected to the three-phase winding of the motor is used to convert the direct current output by the power battery into three-phase alternating current, thereby providing the three-phase alternating current required for the motor's operation. When the first conversion module 341 reuses the three-phase winding of the motor and the three-phase bridge arm, the three-phase bridge arm is connected to the power battery via the second conversion module 342 in the charging device 30. Therefore, when the vehicle is operating in the driving mode, even if the power battery voltage decreases as the capacity gradually decreases, the second conversion module 342 can still convert the amplitude of the power battery into the effective value of the three-phase alternating current required for motor operation, which is conducive to further improving the vehicle's driving efficiency.

[0082] Referring to FIG6 , a schematic diagram of the structure of the three-phase winding of the motor and the three-phase bridge arm connected to the three-phase winding is shown. Referring to FIG6 , the first conversion module 341 includes inductors L1 to L3 and switches Q1 to Q8, and the second conversion module includes switch Q9, switch Q10, and inductor L4. Among them, inductors L1 to L3 constitute the three-phase winding of the motor, switches Q1 and Q2 can be regarded as the first phase bridge arm in the three-phase bridge arm when connected in series, switches Q3 and Q4 can be regarded as the second phase bridge arm in the three-phase bridge arm when connected in series, switches Q5 and Q6 can be regarded as the third phase bridge arm in the three-phase bridge arm when connected in series, and switches Q7 and Q8 can be regarded as a single-phase bridge arm when connected in series. Among them, since when the charging device 30 operates in the AC charging mode or the AC discharging mode, the multiple switches in the first conversion module 341 are used to rectify the industrial frequency AC voltage or the high-frequency AC voltage, therefore, the multiple switches in the first conversion module 341 are selected to be switches that can perform high-frequency switching, such as MOSFET and IGBT, etc.

[0083] The connection relationship of each component in the conversion circuit shown in Figure 6 is as follows: the middle node of the first phase bridge arm is connected to the second end of the inductor L1; the middle node of the second phase bridge arm is connected to the second end of the inductor L2; the middle node of the third phase bridge arm is connected to the second end of the inductor L3; the first end of the first inductor L1, the first end of the second inductor L2 and the first end of the third inductor L3 are connected as the interface A of the first end of the first conversion module 341; the middle node of the single-phase bridge arm serves as the interface B of the first end of the first conversion module 341; the first end of the switch Q1, the first end of the switch Q3, and the first end of the switch Q The first end of switch Q5 and the first end of switch Q7 are connected to interface C serving as the second end of the first conversion module 341; the second ends of switches Q2, Q4, Q6, and Q8 are connected to interface D serving as the second end of the first conversion module 341; the first end of switch Q9 is connected to interface C, and the second end of switch Q9 is connected to the first end of inductor L4 and the first end of switch Q10, respectively; the second end of switch Q10 is connected to interface D and an end of the power battery receiving a low level; the second end of inductor L4 is connected to an end of the power battery receiving a high level.

[0084] When the charging device 30 operates in the DC charging mode, interface A serves as the end at which the first conversion module 341 receives a high level, interface B serves as the end at which the first conversion module 341 receives a low level, interface C serves as the end at which the first conversion module 341 outputs a high level, and interface D serves as the end at which the first conversion module 341 outputs a low level. When the charging device 30 operates in the DC discharging mode, interface C serves as the end at which the first conversion module 341 receives a high level, interface D serves as the end at which the first conversion module 341 receives a low level, interface A serves as the end at which the first conversion module 341 outputs a high level, and interface B serves as the end at which the first conversion module 341 outputs a low level.

[0085] In one example, as shown in FIG7 , to improve the charging quality of the vehicle, a capacitor C1 for voltage stabilization is generally connected in parallel across the switch Q10 , and the second end of the inductor L4 is connected to the power battery via a filter circuit for filtering ripples.

[0086] The following describes the working process of the conversion circuit when the charging device 30 is in different working modes in conjunction with the conversion circuit shown in FIG. 6 or FIG. 7 .

[0087] Referring to the conversion circuit shown in FIG. 6 or FIG. 7 , when the charging device 30 operates in the AC charging mode, in the first conversion module 341, one of the three-phase bridge arms can be combined with the single-phase bridge arm to form a power factor correction (PFC) circuit. For example, the inductor L1, the switch Q1, the switch Q2, the switch Q7, and the switch Q8 can constitute a single-phase PFC circuit. During the positive half-cycle of the AC power output by the AC power source, i.e., when the voltage amplitude at interface A is greater than the voltage amplitude at interface B, switches Q1 and Q2 are controlled to alternately conduct, while switch Q8 is controlled to be permanently conducted. At this time, the PFC circuit can convert the positive half-cycle signal into DC power and output it to the second conversion module 342 via interfaces C and D. During the negative half-cycle of the AC power output by the AC power supply, i.e., when the voltage amplitude at interface A is less than the voltage amplitude at interface B, switches Q1 and Q2 are controlled to alternately conduct, while switch Q7 is controlled to be permanently on. The PFC circuit can convert the signal in the negative half-cycle into DC power and output it to the second conversion module 342 via interfaces C and D, thereby fulfilling the rectification function of the first conversion module. The second conversion module 342 adopts a traditional buck circuit topology. It receives the DC power output by the first conversion module 341 via interfaces C and D, performs voltage regulation and filtering on the received power, and then outputs it to the power battery, thereby charging the power battery. When the charging device 30 operates in DC charging mode, in the first conversion module, switch Q7 in the single-phase bridge arm can be controlled to be permanently off, while switch Q8 can be controlled to be permanently on. One of the three-phase bridge arms operates to form a traditional boost circuit topology, regulating the voltage of the received power and outputting it to the second conversion module 342 via interfaces C and D. The second conversion module 342 is a traditional buck circuit topology, which can receive the electric energy output by the first conversion module 341 through interfaces C and D, perform voltage regulation and filtering on the received electric energy, and then output it to the power battery, thereby charging the power battery.

[0088] In one example, when the charging device operates in AC charging mode or DC charging mode, one of the three-phase bridge arms operates to achieve voltage regulation or rectification, or two or three-phase bridge arms operate to achieve voltage regulation or rectification. For example, when the charging device operates in AC charging mode, the three-phase bridge arm can be combined with the single-phase bridge arm to form a PFC circuit, and the received single-phase AC power can be rectified into DC power. In this case, the switches in the two-phase bridge arm or the three-phase bridge arm operate in alternating conduction mode. Similarly, when the charging device operates in DC charging mode, each phase of the three-phase bridge arm forms a boost circuit to regulate the received voltage.

[0089] Continuing with the conversion circuit shown in FIG. 6 or FIG. 7 , when the charging device 30 operates in the AC discharge mode, the second conversion module 342 employs a conventional boost circuit topology, which regulates and filters the DC power outputted by the power battery and outputs it to the first conversion module 341 via interfaces C and D. If the voltage amplitude of the power battery is the same as the supply voltage amplitude of the AC load, the control switch Q9 is permanently on and the control switch Q10 is permanently off. In this case, the second conversion module 342 is used only for power transmission and does not perform voltage regulation. In the first conversion module 341, one of the three-phase bridge arms can be combined with a single-phase bridge arm to form an inverter circuit, which inverts the DC power outputted by the second conversion module 341 into AC power and outputs it to the AC load via the first switch circuit 33 and the charging receptacle 32. When the charging device 30 operates in the DC discharge mode, the second conversion module 342 employs a conventional boost circuit topology, which regulates and filters the DC power outputted by the power battery and outputs it to the first conversion module 341 via interfaces C and D. If the voltage amplitude of the power battery is the same as the power supply voltage amplitude of the DC load, the switch Q9 can be controlled to be turned on for a long time, and the switch Q10 can be controlled to be turned off for a long time. At this time, the second conversion module 342 is only used for power transmission and does not perform voltage regulation. In the first conversion module 341, the switch Q8 can be controlled to be turned on for a long time, and the switch Q7 can be controlled to be turned off for a long time. One of the three-phase bridge arms constitutes a traditional buck circuit topology, and performs voltage regulation on the power received through interfaces C and D. If the voltage amplitude of the power received through interfaces C and D is the same as the power supply voltage amplitude of the DC load, the first conversion module 341 does not need to perform voltage regulation. The switch connected to interface C in the working bridge arm can be controlled to be turned on for a long time, and the other switch can be turned off for a long time. Then the first conversion module 341 only performs power transmission and does not perform voltage regulation.

[0090] In one example, when the charging device 30 operates in a DC charging mode or a DC discharging mode, if the voltage amplitude of the DC power output by the DC power supply is the same as the voltage amplitude of the power battery, or the voltage amplitude of the power battery is the same as the rated voltage of the DC load, in order to reduce the loss of electric energy in the conversion circuit, a second switch circuit 36 ​​can be connected between the charging socket 32 ​​and the power battery. Therefore, the electric energy output by the DC power supply can be directly transmitted to the power battery through the second switch circuit 36, and the electric energy output by the power battery can be directly transmitted to the DC load through the second switch circuit 36, thereby reducing the number of devices passed through during the electric energy transmission process, which is conducive to further improving the efficiency of the charging device 30.

[0091] Figure 8 is a schematic diagram of the charging device when the second switching circuit is configured. As shown in Figure 8 , the first switching circuit 33 may include relays K1 and K2, and the second switching circuit 36 ​​may include relays K3 and K4. The first end of relay K1 is connected to the phase line L in the charging socket, and the second end of relay K1 is connected to port A. The first end of relay K2 is connected to the neutral line N in the charging socket, and the second end of relay K2 is connected to port B. The first end of relay K3 is connected to the phase line L, and the second end of relay K3 is connected to the positive electrode of the power battery. The first end of relay K4 is connected to the neutral line N, and the second end of relay K4 is connected to the negative electrode of the power battery.

[0092] As shown in Figure 8, when relays K1 and K2 are in the on state, the AC charging cable or DC charging cable connected to the charging socket is connected to the power battery through the first conversion module 341 and the second conversion module 342. After the conversion processing by the first conversion module 341 and the second conversion module 342, the charging or power supply requirements are met. When relays K3 and K4 are in the on state, the DC power supply or DC load connected to the charging socket is connected to the power battery. The DC power supply can directly charge the power battery, or the power battery can directly power the DC load. When either relay K1 or relay K2 is off, the first switch circuit disconnects the power battery from the DC power supply or DC load. Similarly, when either relay K3 or relay K4 is off, the second switch circuit disconnects the power battery from the DC power supply or DC load. Therefore, the configuration of one or two relays in the first and second switch circuits can achieve both charging and discharging control. The specific number of relays in the first and second switch circuits is not limited in this application.

[0093] It should be noted that relays are used as switching devices in the first switching circuit 33 and the second switching circuit 36 ​​in the embodiment of the present application because relays are a common choice of switching devices in high-power power supply scenarios. Other switching devices can also be selected in actual applications, and this application does not limit this.

[0094] It should be understood that the introduction of the conversion circuit structure in this application is only for illustration. When implemented, the conversion circuit can also adopt other circuit structures, which are not introduced one by one in this application.

[0095] As can be seen from the above description, one or more switches are provided in the multiple circuits within the charging device 30. By controlling the on and off control states of the switches in the control circuits, the charging device 30 completes the processing of electrical energy in different working modes.

[0096] The operating states of the switches in each circuit can be controlled by a controller 35 or a vehicle controller within the vehicle. The controller 35 can determine the operating mode of the charging device and directly adjust the operating states of multiple switches within the charging device 30 based on the operating mode of the charging device 30. The controller 35 can also determine the operating mode of the charging device 30, transmit the operating mode of the charging device 30 to the vehicle controller within the vehicle, and the vehicle controller controls the operating states of multiple switches within the charging device 30. The controller 35 can be an electric vehicle communication controller (EVCC) or another module within the vehicle with control functions.

[0097] In actual use, when the device connected to the charging device 30 is a load, if the device connected to the charging device 30 is an AC load powered by AC power, the charging device 30 can be controlled to enter the AC discharge mode. If the device connected to the charging device 30 is a DC load powered by DC power, the charging device 30 can be controlled to enter the DC discharge mode. When the device connected to the charging device 30 is a power supply. If the power supply connected to the charging device 30 is an AC power supply that outputs AC power, the charging device 30 can be controlled to enter the AC charging mode. If the power supply connected to the charging device 30 is a DC power supply that outputs DC power, the charging device 30 can be controlled to enter the DC charging mode. Therefore, before controlling the operation of the charging device 30, it is necessary to first determine the device connected to the charging device 30, and determine the working mode of the charging device after startup based on the connected device, and control the charging device to enter the corresponding working process.

[0098] In specific implementation, when the AC charging gun is connected to the charging socket 32 ​​through the connector 31 or the DC charging gun is connected to the charging socket 32, the AC charging gun or the DC charging gun will send a high-level voltage signal to the charging socket 32. The controller 35 receives the high-level voltage signal and enters the wake-up state from the sleep state, determines the device connected to the charging device 30 according to the resistance value of the connection confirmation line in the charging socket 32, and controls the charging device 30 to enter the corresponding working mode.

[0099] The following describes the process of the controller 35 determining the working mode of the charging device in different charging scenarios in conjunction with the structure of the charging socket 32.

[0100] Generally, the AC charging gun is a standard 7-pin plug, the DC charging gun is a standard 9-pin plug, and the charging socket 32 ​​is a standard socket that can be plugged and unplugged with the DC charging gun, that is, the charging socket 32 ​​provided in the embodiment of the present application can be a standard 9-pin socket.

[0101] Specifically, the charging socket 32 ​​may include a cable assembly and a housing. The cable assembly is disposed within the housing, and the housing is provided with an external interface for connecting each cable. The cable assembly may include multiple cables with different functions. For example, as shown in FIG9 , the cable assembly may include a DC power supply DC+, a DC power supply DC-, a grounding line PE, a charging communication line S+, a charging communication line S-, a connection confirmation line CC1, a connection confirmation line CC2, a low-voltage auxiliary power line A+, and a low-voltage auxiliary power line A-. Each of the above cables is connected to an external interface on the housing, thereby forming a standard 9-hole socket. It should be noted that the above description of the charging socket 32 ​​is merely an example. Depending on charging requirements, the charging socket 32 ​​provided in the embodiment of the present application may also have other structures, and this application does not impose any further limitations here.

[0102] Specifically, an AC charging gun is generally equipped with a cable assembly and an outer protective tube. The cable assembly is equipped with multiple cables with different functions, such as a connection confirmation line CC, a charging pile connection confirmation line CP, a ground line PE, three-phase AC power L1, three-phase AC power L2, three-phase AC power L3, and a neutral line N. It should be noted that the above description of the AC charging gun is only an example. Depending on the charging requirements, the AC charging gun can also have other structures, and this application does not impose too many restrictions here.

[0103] In actual use, the DC charging gun contains cables with the same functions as the charging socket 32. Each cable is connected to an external interface. When the DC charging gun is plugged into the charging socket 32 ​​of the charging device 30, it connects to the cables with the same functions inside the charging socket 32. The first connecting portion 311 of the connector 31 can be a standard 7-pin socket that plugs and unplugs into the AC charging gun. Specifically, the first connecting portion 311 is provided with an interface corresponding to each cable in the AC charging gun. When the AC charging gun is plugged into the first connector 311 of the connector 31, each cable in the AC charging gun connects to the corresponding interface. Similarly, the second connector 312 of the connector 31 can be a standard 9-pin plug that plugs and unplugs into the charging socket 32. Specifically, the second connector 312 is provided with an interface corresponding to each cable in the charging socket 32. When the second connecting portion 312 is plugged into the charging socket 32, each interface on the second connecting portion 312 connects to the corresponding cable. Therefore, the connection between the AC charging gun and the charging socket 32 ​​is established through the connector 31. 9 , when the AC charging gun is connected to the charging socket 32 ​​through the connector 31, the three-phase AC power L1 in the AC charging gun can be connected to the DC power supply DC+ in the charging socket 32 ​​through the connector 31, the neutral line N can be connected to the DC power supply DC- in the charging socket through the connector 31, the ground line PE can be connected to the ground line PE in the charging socket through the connector, the charging pile connection confirmation line CP can be connected to the low-voltage auxiliary power line A+ in the charging socket through the connector, and the connection confirmation line CC can be connected to the connection confirmation line CC2 in the charging socket through the connector.

[0104] In actual use, the controller 35 can be connected to the low-voltage auxiliary power line A+ in the charging socket 32. When a DC charging gun is plugged into the charging socket of the charging device, it outputs a 12V DC voltage signal to the low-voltage auxiliary power line A+ in the charging socket 32. The controller 35 wakes up after receiving the high-level voltage signal. When an AC charging gun is plugged into the first connection portion 311 of the connector 31 and the second connection portion 312 of the connector 31 is plugged into the charging socket 32, the AC charging gun outputs a 12V pulse voltage signal to the low-voltage auxiliary power line A+ in the charging socket 32. The controller 35 wakes up after receiving this pulse voltage signal. Therefore, when the controller 35 determines that the voltage on the low-voltage auxiliary power line A+ is a fixed 12V DC voltage signal, it can determine that the charging socket 32 ​​is connected to the DC charging gun. When the controller 35 determines that the voltage on the low-voltage auxiliary power line A+ is a voltage signal with an initial value of 12V, it can determine that the charging socket 32 ​​is connected to the AC charging gun through the connector 31.

[0105] Specifically, the controller 35 detects the resistance of the connection confirmation line CC2 in the charging socket 32 ​​and, based on the resistance requirements in the Electric Vehicle Conductive Power Supply System Standard, determines the device connected to the charging plug connected to the charging socket 32. If the controller 35 determines that the device connected to the charging socket 32 ​​is a DC power source, it determines the charging power and current of the power battery based on the signals transmitted by the charging communication lines S+ and S-, and controls the charging device 30 to enter DC charging mode. If the controller 35 determines that the device connected to the charging socket 32 ​​is a DC load, it determines the power supply power and operating current of the DC load based on the signals transmitted by the charging communication lines S+ and S-, and controls the charging device 30 to enter DC discharging mode. If the controller 35 determines that the device connected to the charging socket 32 ​​is an AC power source, it determines the charging power and current of the power battery based on the resistance of the connection confirmation line CC2, and controls the charging device 30 to enter AC charging mode. When the controller 35 determines that the device connected to the charging socket 32 ​​is an AC load, it determines the power supply and current of the AC load according to the resistance of the connection confirmation line CC2 and controls the charging device 30 to enter the AC discharge mode.

[0106] In one possible implementation, since DC charging guns are equipped with dedicated charging protection devices, while AC charging guns generally do not, to ensure vehicle charging safety, an electronic locking assembly can be provided in the charging device 30. This electronic locking assembly can be installed on the charging socket 32 ​​and is used to lock the charging socket 32 ​​with the second connection portion 312 of the connector 31. Since the AC charging gun and the first connection portion 311 of the connector 31 are pluggable, there is still a risk of electric shock if a user accidentally unplugs the AC charging gun from the connector 31 during charging. Therefore, in addition to the electronic locking assembly, the charging device 30 can also include a mechanical locking assembly. This mechanical locking assembly can be installed on the connector 31 and is used to lock the AC charging gun and the first connection portion 311 of the connector 31. Thus, the mechanical locking assembly and the electronic locking assembly can achieve charging safety in AC charging scenarios.

[0107] In one example, when the AC charging gun is inserted into the first connection portion 311 of the connector 31, the mechanical locking assembly is in a locked state. When the charging current determined by the resistance of the connection confirmation line CC2 by the controller 35 is greater than the set current, the electronic locking assembly is controlled to be in a locked state. The set current value can be set according to the provisions of the "Electric Vehicle Conductive Power Supply System Standard", for example, the set current is 32A. The set current value can also be set according to the user's preference, which is not limited in this application.

[0108] In another example, the mechanical locking assembly is locked when the AC charging gun is plugged into the first connection portion 311 of the connector 31. When the controller 35 determines, based on the resistance of the connection confirmation line CC2, that the device connected to the AC charging gun is a power source, it controls the electronic locking assembly to be locked.

[0109] In one possible implementation, to ensure vehicle safety during discharge, the mechanical locking assembly is locked when the AC charging gun is plugged into the first connection portion 311 of the connector 31. When the controller 35 determines, based on the resistance of the connection confirmation line CC2, that the device connected to the AC charging gun is an AC load, it controls the electronic locking assembly to lock.

[0110] The above is the working principle of the charging device 30 provided in the embodiment of the present application. When implemented, the charging device can be installed in a vehicle. As shown in Figure 10, the controller in the charging device 30 can have a communication function, connected to the vehicle's wireless communication device, and communicate with electronic equipment and servers through the wireless communication device in the vehicle, and control the working status of the charging device 30 according to the signal transmitted by the wireless communication device.

[0111] Referring to FIG11 , an embodiment of the present application further provides a charging control method, which is applied to a charging device and executed by a controller in the charging device. The structure of the charging device can be referred to the description in the previous embodiment and will not be described in detail here. The charging control method may include the following steps:

[0112] Step S1101: Detect the connection status of the charging socket.

[0113] In the above scheme, when an AC charging cable is plugged into a charging socket via a connector, it sends an initial 12V voltage signal to the controller via the socket's low-voltage auxiliary power line, A+. When a DC charging cable is plugged directly into a charging socket, it sends a fixed 12V DC voltage signal via the socket's low-voltage auxiliary power line, A+. After receiving this voltage signal, the controller wakes up from sleep mode and determines whether the charging socket is connected to a DC charging cable or to an AC charging cable via the connector.

[0114] Step S1102: When it is determined that the charging socket is plugged into the DC charging gun or plugged into the AC charging gun through the connector, detect the resistance of the connection confirmation line in the AC charging socket.

[0115] Step S1103: Determine a target operating mode of the charging device according to the resistance value, and control the charging device to operate in the target mode. The operating modes include a DC charging mode and an AC charging mode.

[0116] In one possible implementation, the controller can detect the resistance of the connection confirmation line CC2 in the charging socket. If the resistance of the connection confirmation line CC2 is determined to meet the DC power supply requirements of the "Electric Vehicle Conductive Power Supply System Standard," the controller can determine that the charging device enters the DC charging mode. If the resistance of the connection confirmation line CC2 is determined to meet the load requirements of the "Electric Vehicle Conductive Power Supply System Standard," the controller can determine that the charging device enters the DC discharging mode.

[0117] Specifically, before controlling the charging device to enter DC charging mode, the controller determines the charging power and current of the power battery based on signals transmitted by the charging communication lines S+ and S- in the charging socket, and controls the charging device to enter DC charging mode. Before controlling the charging device to enter DC discharging mode, the controller Zi'an determines the power and current supplied to the DC load based on signals transmitted by the charging communication lines S+ and S- in the charging socket, and controls the charging device to enter DC discharging mode.

[0118] In another possible implementation, the controller may detect the resistance of the connection confirmation line CC2 in the charging socket and, if the resistance value determines that the device connected to the charging socket is an AC power source, determine that the charging device enters the AC charging mode. If the resistance value of the connection confirmation line CC2 determines that the device connected to the charging socket is an AC load, the controller may determine that the charging device enters the AC discharging mode.

[0119] Specifically, before controlling the charging device to enter AC charging mode, the controller determines the charging power and charging current of the power battery based on the resistance of the connection confirmation line CC2. If the charging current amplitude is determined to be greater than a set current, the controller controls the electronic locking assembly to be locked and controls the charging device to enter AC charging mode. Before controlling the charging device to enter AC discharging mode, the controller controls the electronic locking assembly to be locked, determines the power and current supplied to the load based on the resistance of the connection confirmation line CC2, and controls the charging device to enter AC discharging mode.

[0120] In combination with the above description, as shown in FIG12 , the charging control method provided in the embodiment of the present application may include the following specific steps:

[0121] Step S1201: Determine whether a voltage signal with an amplitude greater than or equal to a set voltage value is received. If yes, execute step S1202; otherwise, return to execute step S1201.

[0122] Step S1202: Detect the resistance of the connection confirmation line.

[0123] Step S1203: Determine whether the device connected to the charging socket is a DC power supply. If so, execute step 1204; otherwise, execute step S1205.

[0124] Specifically, the controller can detect the resistance of the connection confirmation line CC2 in the charging socket, and when it is determined that the resistance meets the requirements of the "Electric Vehicle Conductive Power Supply System Standard" for DC power supply, it determines that the charging socket is connected to the DC power supply.

[0125] Step S1204: Determine the charging power and charging current of the power battery according to the signal transmitted by the charging communication line in the charging socket, and control the charging device to enter a DC charging mode.

[0126] Step S1205 , determine whether the device connected to the charging socket is a DC load. If so, execute step 1206 ; otherwise, return to execute step 1207 .

[0127] Specifically, the controller can detect the resistance of the connection confirmation line CC2 in the charging socket, and when it is determined that the resistance meets the load requirements of the "Electric Vehicle Conductive Power Supply System Standard", it determines that the charging socket is connected to the DC load.

[0128] Step S1206: Determine the power supply and current of the DC load according to the signal transmitted by the charging communication line in the charging socket, and control the charging device to enter the DC discharge mode.

[0129] Step S1207: Determine whether the device connected to the charging socket is an AC power source. If so, execute step 1208; otherwise, execute step S1212.

[0130] Specifically, the controller can detect the resistance of the connection confirmation line in the charging socket, and determine that the charging socket is connected to the AC power supply when it is determined that the resistance is within the corresponding resistance range of the AC power supply in the preset resistance and connection device correspondence table.

[0131] Step S1208: Determine the charging current and charging power of the power battery according to the resistance of the connection confirmation line in the charging socket.

[0132] Step S1209 , detecting whether the charging current of the power battery is greater than the set current, if so, executing step S1210 , otherwise executing step S1211 .

[0133] Step S1210: Control the electronic locking assembly to be in a locked state.

[0134] Step S1211: Control the charging device to enter AC charging mode.

[0135] Step S1212: Determine the charging current and charging power of the power battery according to the resistance of the connection confirmation line in the charging socket, and control the charging device to enter the AC discharge mode.

[0136] In one example, before controlling the charging device to enter the AC discharge mode, the controller may control the electronic lock to be in a locked state to ensure discharge safety of the charging device.

[0137] Based on the same technical concept, an embodiment of the present application also provides a vehicle, wherein the charging system includes a power battery and the aforementioned charging device.

[0138] Among them, the connector includes a first connecting part and a second connecting part, the first connecting part is used for plugging and unplugging with the AC charging gun, and the second connecting part is used for plugging and unplugging with the charging socket; the charging socket is used for plugging and unplugging with the DC charging gun, and receiving the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the connector; the conversion circuit is connected to the charging socket through the first switching circuit, and is used to receive the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the first plug-in part, and convert the received electric energy into the charging voltage of the power battery to charge the power battery; the controller is used to identify the device connected to the DC charging gun or the AC charging gun when the DC charging gun is inserted into the charging socket or the AC charging gun is inserted into the connector, and when it is determined that the AC charging gun or the device connected to the AC charging gun is a power source, control the charging device to charge the power battery.

[0139] In one possible implementation, the controller is also used to: when a DC charging gun is inserted into a charging socket or an AC charging gun is inserted into a connector, and the device connected to the AC charging gun or DC charging gun is a load, control the conversion circuit to convert the output voltage of the power battery into the supply voltage of the load and power the load.

[0140] In a possible implementation, the charging device further includes a second switch circuit connected between the first switch circuit and the power battery.

[0141] In one possible implementation, when the AC charging gun is inserted into the first connection part and the second connection part is inserted into the charging socket, the communication line in the AC charging gun is connected to the backup power line in the charging socket; when the DC charging gun is inserted into the charging socket, the communication line in the DC charging gun is connected to the communication line in the charging socket.

[0142] In one possible implementation, the controller is specifically configured to determine a device connected to the DC charging gun or the AC charging gun based on a resistance value of a connection confirmation line in the charging socket.

[0143] Based on the above embodiments, the embodiments of the present application further provide a computer program, which, when executed on a computer, enables the computer to implement the methods provided in the embodiments shown in FIG. 11 to FIG. 12 .

[0144] Based on the above embodiments, the embodiments of the present application further provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a computer, the computer implements the method provided in the embodiments shown in Figures 11 to 12. The storage medium can be any available medium that can be accessed by a computer. Taking this as an example but not limited to: the computer-readable medium may include RAM, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM1), CD-ROM or other optical disk storage, disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer.

[0145] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0146] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each flow and / or box in the flow chart and / or block diagram, as well as the combination of the flow chart and / or box in the flow chart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more flow charts and / or one or more boxes in the block diagram.

[0147] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0148] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0149] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A charging device, applied to a vehicle, characterized in that: include: A connector, a charging socket, a first switch circuit, a conversion circuit and a controller; The connector includes a first connection portion and a second connection portion, the first connection portion is used for plugging and unplugging connection with the AC charging gun, and the second connection portion is plugging and unplugging connection with the charging socket; The charging socket is used to be plugged and unplugged with a DC charging gun, and to receive the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the connector; The conversion circuit is connected to the charging socket through the first switch circuit, and is used to receive the DC power output by the DC charging gun or the AC power output by the AC charging gun, and convert the received electric energy into the charging voltage of the power battery in the vehicle to charge the power battery; The controller is used to identify the device connected to the DC charging gun or the AC charging gun when the charging socket is connected to the DC charging gun or is connected to the AC charging gun through the connector, and when it is determined that the AC charging gun or the device connected to the AC charging gun is a power source, control the charging device to charge the power battery.

2. The charging device according to claim 1, characterized in that: The controller is also used to: when the charging socket is connected to the DC charging gun or is connected to the AC charging gun through the connector, and the device connected to the AC charging gun or the DC charging gun is a load, control the conversion circuit to convert the output voltage of the power battery into the power supply voltage of the load and supply power to the load.

3. The charging device according to claim 2, characterized in that: The charging device also includes a second switch circuit connected between the charging socket and the power battery.

4. The charging device according to claim 2 or 3, characterized in that: When the AC charging gun is inserted into the first connecting part and the second connecting part is inserted into the charging socket, the communication line in the AC charging gun is connected to the low-voltage auxiliary power line in the charging socket; when the DC charging gun is inserted into the charging socket, the communication line in the DC charging gun is connected to the communication line in the charging socket.

5. The charging device according to any one of claims 2 to 4, characterized in that: The controller is specifically configured to identify a device connected to the DC charging gun or the AC charging gun according to a resistance value of a connection confirmation line in the charging socket.

6. The charging device according to claim 5, characterized in that: The controller is also used to: when it is determined that the charging socket is connected to the AC charging gun through the connector, determine the charging power of the power battery or the power supply power of the load according to the resistance value of the connection confirmation line in the charging socket.

7. The charging device according to any one of claims 2 to 6, characterized in that: The conversion circuit comprises: a first conversion module and a second conversion module; A first end of the first conversion module is connected to the first switch circuit, and a second end of the first conversion module is connected to a first end of the second conversion module; The second end of the second conversion module is used to connect to the power battery; The first conversion module is used for, when receiving the alternating current output by the charging socket, rectifying the alternating current and outputting it to the second conversion module; and when receiving the direct current output by the charging socket, regulating the direct current and outputting it to the second conversion module; The second conversion module is used to receive the electric energy output by the first conversion module, convert the received electric energy into a charging voltage for the power battery, and charge the power battery; The second conversion module is further used to perform voltage regulation on the DC power output by the power battery and then output it to the first conversion module; The first conversion module is further used for receiving the electric energy output by the second conversion module, converting the received electric energy into the supply voltage of the load and supplying power to the load.

8. The charging device according to claim 7, characterized in that: The first conversion module includes a three-phase winding of the motor in the vehicle, a three-phase converter connected to the three-phase winding, and a single-phase bridge arm, and the second conversion module includes a voltage regulation circuit.

9. The charging device according to claim 8, characterized in that: When the vehicle operates in driving mode, the voltage regulating circuit is used to regulate the voltage output by the power battery and output it to the three-phase converter. The three-phase converter is also used to convert the electric energy output by the second converter into three-phase alternating current and output it to the three-phase winding.

10. The charging device according to any one of claims 2 to 8, characterized in that: The charging socket is provided with an electronic locking component, and the electronic locking component is used to be in a locked state when the second connecting part is inserted into the charging socket and the AC charging gun is inserted into the first connecting part if the charging current of the power battery is greater than the set current; the connector is provided with a mechanical locking component, and when the AC charging gun is inserted into the first connecting part, the mechanical locking component is in a locked state.

11. The charging device according to claim 10, characterized in that: The electronic locking assembly is also used to be in a locked state when the second connection portion is inserted into the charging socket and the AC charging gun is inserted into the first connection portion.

12. A vehicle, characterized in that: Including power battery and charging device; The charging device comprises: a connector, a charging socket, a first switch circuit, a conversion circuit and a controller; The connector includes a first connecting part and a second connecting part, the first connecting part is used for plugging and unplugging connection with the AC charging gun, and the second connecting part is used for plugging and unplugging connection with the charging socket; the charging socket is used for plugging and unplugging connection with the DC charging gun, and receiving the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the connector; the conversion circuit is connected to the charging socket through the first switching circuit, and is used to receive the DC power output by the DC charging gun or the AC power output by the AC charging gun connected to the first plug-in part, and convert the received electric energy into the charging voltage of the power battery to charge the power battery; the controller is used to identify the device connected to the DC charging gun or the AC charging gun when the DC charging gun is inserted into the charging socket or the AC charging gun is inserted into the connector, and when it is determined that the AC charging gun or the device connected to the AC charging gun is a power source, control the charging device to charge the power battery.

13. The vehicle according to claim 12, characterized in that The controller is also used to: when the DC charging gun is inserted into the charging socket or the AC charging gun is inserted into the connector, and the device connected to the AC charging gun or the DC charging gun is a load, control the conversion circuit to convert the output voltage of the power battery into the power supply voltage of the load and supply power to the load.

14. The vehicle according to claim 13, characterized in that The charging device also includes a second switch circuit connected between the charging socket and the power battery.

15. The vehicle according to claim 13 or 14, characterized in that When the AC charging gun is inserted into the first connecting part and the second connecting part is inserted into the charging socket, the communication line in the AC charging gun is connected to the backup power line in the charging socket; when the DC charging gun is inserted into the charging socket, the communication line in the DC charging gun is connected to the communication line in the charging socket.

16. The vehicle according to any one of claims 13 to 15, characterized in that: The controller is specifically configured to determine a device connected to the DC charging gun or the AC charging gun according to a resistance value of a connection confirmation line in the charging socket.

17. A charging control method, characterized in that: Applied to a vehicle, the vehicle includes a power battery and a charging device, the charging device includes a connector, a charging socket, a first switch circuit, a conversion circuit and a controller, the connector includes a first connection part and a second connection part, the first connection part is used for plugging and unplugging with the AC charging gun, the second connection part is used for plugging and unplugging with the charging socket, the charging socket is used for plugging and unplugging with the DC charging gun, the conversion circuit is connected to the charging socket through the first switch circuit, and the method includes: Detecting the connection status of the charging socket; When it is determined that the charging socket is plugged into the DC charging gun or plugged into the AC charging gun through the connector, detecting the resistance value of the connection confirmation line in the AC charging socket; The target operating mode of the charging device is determined according to the resistance value, and the charging device is controlled to operate in the target mode, wherein the operating mode includes a direct current charging mode and an alternating current charging mode.

18. The method according to claim 17, characterized in that The controlling the charging device to operate in the target mode includes: When it is determined that the target operating mode is the DC charging mode, the conversion circuit is controlled to convert the electric energy output by the DC charging gun into a charging voltage of a power battery in the vehicle and charge the power battery.

19. The method according to claim 17, characterized in that The controlling the charging device to operate in the target mode includes: When it is determined that the target operating mode is the AC charging mode, the conversion circuit is controlled to convert the electric energy output by the AC charging gun into a charging voltage of a power battery in the vehicle and to charge the power battery.

20. The method of claim 17, wherein: The working mode further includes a DC discharge mode and an AC discharge mode, and the controlling the charging device to work in the target mode includes: When it is determined that the target operating mode is the DC discharge mode, the conversion circuit is controlled to convert the voltage output by the power battery into a power supply voltage of a load, and the load is powered through the charging socket.

21. The method of claim 17, wherein: The working mode also includes a DC discharge mode and an AC discharge mode, and controlling the charging device to work in the target mode includes: When the target operating mode is determined to be the AC discharge mode, the conversion circuit is controlled to convert the voltage output by the power battery into The voltage is converted into a supply voltage of a load, and the load is powered through the connector.

22. The method according to any one of claims 17 to 21, characterized in that: The detecting the connection status of the charging socket comprises: Detecting the voltage amplitude of the low-voltage auxiliary power line in the charging socket; When it is determined that the voltage of the backup power line is greater than or equal to the set voltage value, it is determined that the charging socket is connected to the DC charging gun or is connected to the AC charging gun through the connector.

23. The method according to any one of claims 17 to 21, characterized in that: The method further comprises: When it is determined that the charging device operates in the AC charging mode, controlling a locking component in the charging device to be in a locked state; Determining the charging power of the power battery according to the resistance value of the connection confirmation line in the charging socket; According to the charging power, the conversion circuit is controlled to convert the electric energy output by the AC charging gun into the charging voltage of the power battery, and charge the power battery.

24. The method of claim 20, wherein: The method further comprises: When it is determined that the charging device operates in the AC discharge mode, controlling a locking component in the charging device to be in a locked state; Determining the power supply of the load according to the resistance value of the connection confirmation line in the charging socket; According to the power supply power, the conversion circuit is controlled to convert the electric energy output by the power battery into the power supply voltage of the load, and supply power to the load.

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