Charging device and method for charging electric vehicle using charging device

Abstract

The present application provides a charging device and a method for charging an electric vehicle using the charging device. The charging device includes a first charging interface and a second charging interface; the first charging interface includes a first auxiliary power supply contact and a first DC power supply contact; and the second charging interface includes a second auxiliary power supply contact and a second DC power supply contact. The charging device is configured to detect a first voltage signal from the first auxiliary power supply contact and a second voltage signal from the second auxiliary power supply contact, and based on the first and second voltage signals, enables the first and second DC power supply contacts to simultaneously charge the electric vehicle.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a charging device and a method for charging an electric vehicle using the charging device. Background Art

[0002] With the rapid development of new energy vehicle battery technology, the maximum charging current allowed by electric vehicle batteries has far exceeded the maximum current specified by domestic and foreign charging standards. Before the charging standards and charging pile architecture are updated, how to quickly charge electric vehicles that support high-power charging has become an urgent problem to be solved.

[0003] To this end, many vehicle manufacturers have designed dual vehicle sockets in electric buses, heavy trucks, and other electric vehicles, allowing high-power charging by connecting two charging plugs simultaneously. However, users typically need to manually select the dual-charge mode on the charging station's human-machine interface or through the charging app, which is a cumbersome process. Summary of the Invention

[0004] The present application provides a charging device and a method for charging an electric vehicle using the charging device.

[0005] In a first aspect, an embodiment of the present application provides a charging device, the charging device comprising: a first charging interface and a second charging interface, wherein the first charging interface and the second charging interface are used to physically connect to a vehicle.

[0006] The first charging interface includes: a first auxiliary power supply contact and a first DC power supply contact; the first auxiliary power supply contact is used to power the controller of the electric vehicle. The second charging interface includes a second auxiliary power supply contact and a second DC power supply contact.

[0007] When the first charging interface and the second charging interface are connected to the electric vehicle, the charging device is used to detect the first voltage signal of the first auxiliary power supply contact and the second voltage signal of the second auxiliary power supply contact; according to the first voltage signal and the second voltage signal, the first DC power supply contact and the second DC power supply contact simultaneously output current to charge the electric vehicle.

[0008] The first voltage signal includes a first voltage value and a first time value; the first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device obtains the first voltage value. The second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0009] The electric vehicle includes two vehicle sockets, which are respectively used to connect to a first charging interface and a second charging interface, so that the two charging interfaces can charge the same electric vehicle at the same time.

[0010] In one possible implementation, the charging device further includes a first auxiliary power supply voltage detection module, a second auxiliary power supply voltage detection module, and a main control module. The first auxiliary power supply voltage detection module is configured to detect the voltage of the first auxiliary power supply contact, and the second auxiliary power supply voltage detection module is configured to detect the voltage of the second auxiliary power supply contact. The main control module is configured to obtain the first voltage signal and the second voltage signal.

[0011] In one possible embodiment, in response to the main control module acquiring the first voltage signal and the second voltage signal, the charging device is configured to: determine whether the absolute value of the difference between the first voltage value and the second voltage value is within a first preset threshold, and whether the absolute value of the difference between the first time value and the second time value is within a second preset threshold. If the charging device determines that the absolute value of the difference between the first voltage value and the second voltage value is within the first preset threshold, and the absolute value of the difference between the first time value and the second time value is within the second preset threshold, the charging device is configured to enable the first DC power contact and the second DC power contact to charge the electric vehicle.

[0012] In one possible embodiment, in response to the absolute value of the difference between the first voltage value and the second voltage value being less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value being less than or equal to 1 second, the charging device is used to determine that the first charging interface and the second charging interface are connected to the same vehicle.

[0013] In one possible embodiment, in response to the absolute value of the difference between the first voltage value and the second voltage value being less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value being less than or equal to 1.5 seconds, the charging device is used to determine that the first charging interface and the second charging interface are connected to the same vehicle.

[0014] In the subsequent charging process, the main control module is used to obtain the vehicle's charging demand information, and allocate the output voltage and output current of the first charging interface and the second charging interface according to the obtained charging demand information, so that the first DC power supply contact and the second DC power supply contact can charge the same vehicle at the same time.

[0015] The first charging interface further includes a first communication contact, and the second charging interface further includes a second communication contact, wherein the first communication contact and the second communication contact are used to communicate with a controller BMS of the vehicle.

[0016] In one possible implementation, in response to the main control module acquiring the first voltage signal or the second voltage signal, the charging device is configured to:

[0017] Obtaining a first communication signal from a first communication contact, wherein the first communication signal includes first charging information, and the first charging information includes a first vehicle handshake message and a first vehicle identification message;

[0018] Acquire a second communication signal from a second communication contact, wherein the second communication signal includes second charging information, and the second charging information includes a second vehicle handshake message and a second vehicle identification message;

[0019] The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle simultaneously according to the first charging information and the second charging information.

[0020] The BHM includes the BMS's allowable charging voltage information, and the BRM includes the vehicle's battery type, rated capacity, rated voltage, and vehicle identification code information. In response to the first and second charging information being identical, the charging device enables the first and second DC power contacts to charge the electric vehicle.

[0021] In one possible implementation, the charging device is configured to determine whether the first charging interface and the second charging interface are connected to the same vehicle based on the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the first charging information are the same as the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the second charging information, the charging device is configured to determine that the first charging interface and the second charging interface are connected to the same vehicle.

[0022] In one possible embodiment, the charging device is configured to determine whether the first charging port and the second charging port are connected to the same vehicle based on a vehicle identification code (VIN). Specifically, if the VIN included in the first charging information is the same as the VIN included in the second charging information, the charging device determines that the first charging port and the second charging port are connected to the same vehicle.

[0023] In the subsequent charging process, the main control module is used to obtain the vehicle's charging demand information, and allocate the output voltage and output current of the first charging interface and the second charging interface according to the obtained charging demand information, so that the first DC power supply contact and the second DC power supply contact can charge the same vehicle at the same time.

[0024] In a possible implementation, the charging device further includes at least one human-computer interaction interface for enabling information interaction between the user and the charging device.

[0025] Based on the above-mentioned charging equipment, when the user needs to charge with two guns at the same time, there is no need for complicated manual operation. Just connect the charging gun to the vehicle's socket. After starting charging, the charging equipment can automatically realize the simultaneous charging of the vehicle's two guns, simplifying the charging process and improving the user's charging experience.

[0026] In a second aspect, an embodiment of the present application further provides a method for charging an electric vehicle using a charging device, which is applicable to the above-mentioned charging device. The method includes:

[0027] detecting a first voltage signal of a first auxiliary power supply contact and a second voltage signal of a second auxiliary power supply contact;

[0028] The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle simultaneously according to the first voltage signal and the second voltage signal.

[0029] The first voltage signal includes a first voltage value and a first time value; the first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device obtains the first voltage value. The second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0030] In one possible implementation, the charging device further includes a first auxiliary power supply voltage detection module, a second auxiliary power supply voltage detection module, and a main control module. The first auxiliary power supply voltage detection module is configured to detect the voltage of the first auxiliary power supply contact, and the second auxiliary power supply voltage detection module is configured to detect the voltage of the second auxiliary power supply contact. The main control module is configured to obtain the first voltage signal and the second voltage signal.

[0031] In one possible implementation, in response to the main control module acquiring the first voltage signal and the second voltage signal, the charging device determines whether the absolute value of the difference between the first voltage value and the second voltage value is within a first preset threshold, and whether the absolute value of the difference between the first time value and the second time value is within a second preset threshold. If it is determined that the absolute value of the difference between the first voltage value and the second voltage value is within the first preset threshold, and the absolute value of the difference between the first time value and the second time value is within the second preset threshold, the charging device enables the first DC power contact and the second DC power contact to charge the electric vehicle.

[0032] In one possible implementation, in response to the absolute value of the difference between the first voltage value and the second voltage value being less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value being less than or equal to 1 second, the charging device determines that the first charging interface and the second charging interface are connected to the same vehicle.

[0033] In one possible implementation, in response to the absolute value of the difference between the first voltage value and the second voltage value being less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value being less than or equal to 1.5 seconds, the charging device determines that the first charging interface and the second charging interface are connected to the same vehicle.

[0034] In the subsequent charging process, the main control module obtains the charging demand information of the vehicle and allocates the output voltage and output current of the first charging interface and the second charging interface according to the obtained charging demand information, so that the first DC power supply contact and the second DC power supply contact can charge the same vehicle at the same time.

[0035] The first charging interface further includes a first communication contact, and the second charging interface further includes a second communication contact, wherein the first communication contact and the second communication contact are used to communicate with a controller BMS of the vehicle.

[0036] In one possible implementation, in response to the main control module acquiring the first voltage signal or the second voltage signal, the charging device:

[0037] Obtaining a first communication signal from a first communication contact, wherein the first communication signal includes first charging information, and the first charging information includes a first vehicle handshake message and a first vehicle identification message;

[0038] Acquire a second communication signal from a second communication contact, wherein the second communication signal includes second charging information, and the second charging information includes a second vehicle handshake message and a second vehicle identification message;

[0039] The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle simultaneously according to the first charging information and the second charging information.

[0040] The BHM includes the BMS's allowable charging voltage information, and the BRM includes the vehicle's battery type, rated capacity, rated voltage, and vehicle identification code information. In response to the first and second charging information being identical, the charging device enables the first and second DC power contacts to charge the electric vehicle.

[0041] In one possible implementation, the charging device determines whether the first and second charging interfaces are connected to the same vehicle based on the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the first charging information are the same as the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the second charging information, the charging device determines that the first and second charging interfaces are connected to the same vehicle.

[0042] In one possible implementation, the charging device determines whether the first charging port and the second charging port are connected to the same vehicle based on the vehicle identification code (VIN). Specifically, if the VIN included in the first charging information is the same as the VIN included in the second charging information, the charging device determines that the first charging port and the second charging port are connected to the same vehicle.

[0043] In the subsequent charging process, the main control module obtains the charging demand information of the vehicle and allocates the output voltage and output current of the first charging interface and the second charging interface according to the obtained charging demand information, so that the first DC power supply contact and the second DC power supply contact can charge the same vehicle at the same time.

[0044] Based on the above-mentioned method for charging electric vehicles, when the user needs to charge with two guns at the same time, there is no need for complicated manual operation. It is only necessary to connect the charging gun to the socket of the vehicle. After starting charging, this method can automatically realize the charging of the vehicle with two guns at the same time, simplifying the charging process and improving the user's charging experience.

[0045] In a third aspect, an embodiment of the present application further provides a method for charging an electric vehicle using a charging device, which is applicable to the above-mentioned charging device. The method includes:

[0046] A storage state machine includes multiple states, each of which is used to manage an action during the charging process of the charging device. The multiple states include a dual charging interface connection state and a dual charging interface power supply state. The dual charging interface connection state indicates that the first and second charging interfaces are physically connected to the electric vehicle; the dual charging interface power supply state indicates that the first and second DC power supply contacts are simultaneously charging the electric vehicle. The state machine is configured to provide entry and exit conditions for at least one of the multiple states.

[0047] In a possible implementation, the exit condition of the dual charging interface connection state is: the charging device controller detects that the voltage value of the charging connection confirmation contact of the first charging interface and the voltage value of the charging connection confirmation contact of the second charging interface are both 4V.

[0048] In a possible implementation, the multiple states further include an auxiliary power supply powered-on state, which is used to indicate that the auxiliary power supply of the charging device is supplying power to the controller of the electric vehicle.

[0049] In one possible implementation, the auxiliary power supply state is entered when the charging device controller detects that the voltage values ​​of the charging connection confirmation contact of the first charging interface and the charging connection confirmation contact of the second charging interface are both 4V. The auxiliary power supply state is exited when the charging device controller detects a first voltage signal from the auxiliary power supply contact of the first charging interface or a second voltage signal from the auxiliary power supply contact of the second charging interface; or the charging device detects both the first and second voltage signals, and both the first and second voltage signals meet preset conditions.

[0050] The first voltage signal includes a first voltage value and a first time value; the first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device obtains the first voltage value. The second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0051] In one possible implementation, it is determined that the absolute value of the difference between the first voltage value and the second voltage value is less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value is less than or equal to 1 second, and the charging device exits the auxiliary power supply power-on state and enters the dual charging interface power supply state.

[0052] In one possible implementation, it is determined that the absolute value of the difference between the first voltage value and the second voltage value is less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value is less than or equal to 1.5 seconds, and the charging device exits the auxiliary power supply power-on state and enters the dual charging interface power supply state.

[0053] In one possible implementation, the multiple states also include a dual-charging handshake identification state, which indicates that the charging device is communicating with the electric vehicle. This state is entered when the charging device controller receives either the first voltage signal or the second voltage signal. This state is exited when the charging device controller receives both the first and second communication signals, and both meet pre-set conditions.

[0054] The first communication signal includes first charging information, which includes a first vehicle handshake message and a first vehicle identification message. The second communication signal includes second charging information, which includes a second vehicle handshake message and a second vehicle identification message. The BHM contains the BMS's allowable charging voltage information, and the BRM contains the vehicle's battery type, rated capacity, rated voltage, and vehicle identification code. If the first and second charging information are determined to be identical, the charging device exits the dual handshake identification state and enters the dual charging port power supply state.

[0055] In one possible implementation, the charging device controller determines whether the first and second charging interfaces are connected to the same vehicle based on the allowable charging voltage, vehicle battery type, battery rated capacity, and battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, vehicle battery type, battery rated capacity, and battery rated voltage information contained in the first charging information are the same as the allowable charging voltage, vehicle battery type, battery rated capacity, and battery rated voltage information contained in the second charging information, the charging device determines that the first and second charging interfaces are connected to the same vehicle, exits the dual handshake identification state, and enters the dual charging interface power supply state.

[0056] In one possible implementation, the charging device is configured to determine whether the first charging interface and the second charging interface are connected to the same vehicle based on the vehicle identification code (VIN). Specifically, if the VIN included in the first charging information is the same as the VIN included in the second charging information, the charging device is configured to determine that the first charging interface and the second charging interface are connected to the same vehicle, exit the dual handshake identification state, and enter the dual charging interface power supply state.

[0057] Based on the above-mentioned method for charging electric vehicles, when the user needs to charge with two guns at the same time, there is no need for complicated manual operation. It is only necessary to connect the charging gun to the socket of the vehicle. After starting charging, this method can automatically realize the charging of the vehicle with two guns at the same time, simplifying the charging process and improving the user's charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a schematic diagram of the DC charging control steering circuit in GB / T18487.1-2015 provided in an embodiment of the present application;

[0059] Figure 2 This is a flow chart of a charging preparation process of a charging device provided in an embodiment of the present application;

[0060] Figure 3 This is a schematic diagram of the charging device structure provided in the embodiment of the present application. Figure 1 ;

[0061] Figure 4 (a) is a schematic diagram of contacts of a DC charging vehicle plug in GB / T 20234.3-2015 provided in an embodiment of the present application;

[0062] Figure 4 (b) is a schematic diagram of the contacts of a DC charging vehicle socket in GB / T 20234.3-2015 provided in an embodiment of the present application;

[0063] Figure 4 (c) is a diagram showing the connection relationship between the contacts of a DC charging vehicle socket provided in an embodiment of the present application and the vehicle's battery pack and BMS;

[0064] Figure 5 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 1 ;

[0065] Figure 6 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 2 ;

[0066] Figure 7 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 3 ;

[0067] Figure 8 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 4 ;;

[0068] Figure 9 This is a schematic diagram of the voltage change of the charging connection confirmation contact of the charging interface of the charging device provided in the embodiment of the present application. Figure 1 ;

[0069] Figure 10 This is a schematic diagram of the voltage change of the charging connection confirmation contact of the charging interface of the charging device provided in the embodiment of the present application. Figure 2 ;

[0070] Figure 11 This is a schematic diagram of the voltage change of the charging connection confirmation contact of the charging interface of the charging device provided in the embodiment of the present application. Figure 3 ;

[0071] Figure 12 This is a schematic diagram of the connection of the auxiliary power supply voltage detection circuit provided in the embodiment of the present application. Figure 1 ;

[0072] Figure 13 This is a schematic diagram of the connection of the auxiliary power supply voltage detection circuit provided in the embodiment of the present application. Figure 2 ;

[0073] Figure 14 This is a schematic diagram of the structure of the charging device provided in the embodiment of the present application. Figure 2 ;

[0074] Figure 15 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 5 ;

[0075] Figure 16 The structural diagram of the charging device provided in the embodiment of the present application Figure 3 ;

[0076] Figure 17 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 6 ;

[0077] Figure 18 This is a schematic diagram of the charging interface of the charging device provided in the embodiment of the present application and the vehicle socket plug interface Figure 7 ;

[0078] Figure 19 This is a flow chart of a method for charging an electric vehicle using a charging device according to an embodiment of the present application. Figure 1 ;

[0079] FIG20( a ) is a flow chart of a method for charging an electric vehicle using a charging device according to an embodiment of the present application. Figure 2 ;

[0080] FIG20( b ) is a flow chart of a method for charging an electric vehicle using a charging device according to an embodiment of the present application. Figure 3 ;

[0081] FIG20( c ) is a flow chart of a method for charging an electric vehicle using a charging device according to an embodiment of the present application. Figure 4 . DETAILED DESCRIPTION

[0082] First, some of the terms used in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0083] Connection: should be understood in a broad sense. For example, A and B are connected, which can be either directly connected or indirectly connected through an intermediary.

[0084] The terms "first," "second," etc., in the description are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0085] To facilitate understanding, this application first explains the DC charging control pilot circuit and control principles in the national standard GB / T 18487.1-2015, as well as the communication protocol between the charger and the battery management system (BMS) in the national standard GB / T 26930-2015. (GB / T 26930-2015 specifies that the Controller Area Network 2.0B (CAN 2.0B) communication protocol be used between off-board conductive chargers and the BMS.)

[0086] refer to Figure 1 The figure below shows the schematic diagram of the DC charging control and guidance circuit specified in GB / T 18487.1-2015. The control and guidance circuit is responsible for signal transmission and communication between the electric vehicle and the charging station. The DC charging control and guidance circuit primarily includes an off-board conductive charger (charging station) controller, resistors R1, R2, R3, R4, and R5, a switch S, DC power supply circuit contactors K1 and K2, low-voltage auxiliary power supply circuit contactors K3 and K4, charging circuit contactors K5 and K6, and a vehicle controller. The vehicle controller can be integrated into the BMS. Resistors R2 and R3 are installed in the vehicle plug, and resistor R4 is installed in the vehicle socket. During the entire charging process, the off-board conductive charger controller detects the status of contactors K1, K2, and contactors K3 and K4 and controls their on / off. The electric vehicle controller detects the status of contactors K5 and K6 and controls their on / off.

[0087] Figure 2 This is a flowchart of the charging preparation process of an off-board conductive charger. Before the off-board conductive charger officially charges the electric vehicle, the charging preparation process is mainly divided into the following four stages:

[0088] Step 201: The off-board conductive charger is physically connected to the electric vehicle, and step 202 is executed.

[0089] When the vehicle plug is connected to the vehicle socket, the voltage at test point 1 changes from 6V to 12V to 6V to 4V, and the voltage at test point 2 changes from 12V to 6V. When the off-board conductive charger controller measures a voltage of 4V at test point 1, it determines that the vehicle plug and vehicle socket are successfully connected. In other words, when the off-board conductive charger controller measures a voltage of 4V at test point 1, it determines that the physical connection between the off-board conductive charger and the electric vehicle is complete.

[0090] When the electric vehicle controller measures the voltage value of detection point 2 to be 6V, it determines that the vehicle plug and the vehicle socket are successfully connected. In other words, when the electric vehicle controller measures the voltage value of detection point 2 to be 6V, it determines that the physical connection between the off-board conductive charger and the electric vehicle is completed.

[0091] Step 202: The low-voltage auxiliary power supply is powered on, and step 203 is executed.

[0092] When the off-board conductive charger controller determines that the physical connection between the off-board conductive charger and the electric vehicle is completed, the off-board conductive charger controller issues a control instruction to close the low-voltage auxiliary power supply circuit contactors K3 and K4 to make the low-voltage auxiliary power supply circuit conductive.

[0093] Step 203: Charging handshake phase. After the charging handshake process is completed, step 204 is executed.

[0094] The charging handshake phase is divided into the handshake startup phase and the handshake identification phase;

[0095] After the low-voltage auxiliary power supply circuit is connected, the charging handshake phase begins. During this phase, the off-board conductive charger controller periodically sends Charger Handshake Messages (CHMs) to the on-board controller to confirm whether the two controllers are communicating properly. After receiving the CHMs, the on-board controller periodically sends Battery Handshake Messages (BHMs) to the off-board conductive charger controller. The BHMs contain the allowable charging voltage information of the BMS.

[0096] After receiving the BHM, the off-board conductive charger controller begins an insulation test. Upon completion, the handshake identification phase begins. During this phase, the off-board conductive charger controller stops sending CHMs and begins periodically sending Charger Recognition Messages (CRMs) to the on-board controller. After receiving the CRMs, the on-board controller periodically sends Battery Recognition Messages (BRMs) to the off-board conductive charger controller. The CRMs allow the on-board controller to identify the off-board conductive charger and contain information such as the off-board conductive charger serial number. The BRMs allow the off-board conductive charger controller to identify the vehicle and contain information such as the battery type, rated capacity, rated voltage, and vehicle identification number (VIN). Different electric vehicles require different BRMs from their on-board controllers.

[0097] Step 204: Charging parameter configuration phase. After the charging parameter configuration is completed, the charging phase begins.

[0098] After the charging handshake phase is complete, the charging parameter configuration phase begins. During this phase, the onboard controller periodically sends Power Battery Charging Parameters (BCP) messages to the off-board conductive charger controller. These messages contain information such as the vehicle battery's maximum voltage, maximum current, and allowable temperature. Upon receiving these BCP messages, the off-board conductive charger controller determines whether the vehicle is suitable for charging with this off-board conductive charger. If so, the off-board conductive charger controller periodically sends Charger Maximum Lab (CML) messages to the on-board controller. These CML messages contain information such as the off-board conductive charger's maximum output voltage, maximum output current, and minimum output current. Upon receiving these CML messages, the on-board controller determines whether this off-board conductive charger is suitable for charging the vehicle. If so, it issues a control command to close vehicle-side charging circuit contactors K5 and K6. After K5 and K6 are closed, the vehicle performs an insulation test. Upon completion, the onboard controller sends a Battery Ready OK (BRO) message. Upon receiving the BRO message, the off-board conductive charger controller checks the vehicle's battery voltage for normal operation. If normal, the off-board conductive charger outputs the pre-charge voltage and closes contactors K1 and K2 on the off-board conductive charger's DC power supply circuit, energizing the charging circuit and beginning the charging process.

[0099] It should be noted that Figure 1 The vehicle interface includes a vehicle plug and a vehicle socket. The vehicle socket is fixedly installed on the electric vehicle and is connected to the vehicle battery through a cable. The vehicle plug is used to plug into the vehicle socket. In actual application, Figure 1 The off-board conductive charger is generally a DC charging pile, and the off-board conductive charger controller is located inside the DC charging pile; the vehicle plug is a charging gun head, which is used to connect to the vehicle socket of the electric vehicle; the electric vehicle controller is generally a BMS.

[0100] The following are explanations of the key terms involved in this application:

[0101] Dual-gun simultaneous charging: Two charging guns are inserted into the two vehicle sockets of the same electric vehicle, and output current at the same time to charge the vehicle to be charged.

[0102] Split charging equipment: A split charging device includes a charging host and multiple charging terminals. The charging host is used to convert energy and distribute power of the current output from the grid side; multiple charging terminals are connected to the charging host to realize information exchange and energy transmission between the charging host and electric vehicles.

[0103] The present application provides a charging device and a method for dual-gun charging of a charging device. The charging device provided by the present application can not only match all models that support dual-gun charging, but also when users use the charging device to charge electric vehicles with dual guns, there is no need for complicated manual pairing operations in most scenarios, which can reduce the user's operating procedures and improve the user experience.

[0104] Among them, the electric vehicles mentioned above can be pure electric vehicles (Pure EV / Battery EV, Pure Electric Vehicle / Battery Electric Vehicle), hybrid electric vehicles (HEV, Hybrid Electric Vehicle), extended-range electric vehicles (REEV, Range Extended Electric Vehicle), plug-in hybrid electric vehicles (PHEV, Plug-in Hybrid Electric Vehicle) or other new energy vehicles, etc., and are not limited here.

[0105] like Figure 3 As shown, a split-type charging device 300 provided in an embodiment of the present application includes a charging host 10 and multiple charging terminals 20, 30, etc. The charging host 10 includes a power supply module 11 and a main control module 12. The power supply module 11 is used to convert the AC power output from the grid into DC power that matches the vehicle charging information (including the charging voltage and current allowed by the vehicle battery).

[0106] The charging terminal 20 is connected to the charging host 10 via a power cable 40 and a communication cable 50 to enable energy transmission and information exchange between the two. Specifically, the charging terminal 20 includes a first control unit 21, a second control unit 22, a first auxiliary power supply voltage detection module 23, a second auxiliary power supply voltage detection module 24, a first auxiliary power supply 25, a first charging gun 26, and a second charging gun 27. The first control unit 21 and the second control unit 22 are both connected to the main control module 12 to enable information exchange between the charging terminal 20 and the charging host 10. The first auxiliary power supply 25 is used to power the vehicle's BMS when at least one of the first charging gun 26 and the second charging gun 27 is successfully plugged into the vehicle's socket. The first auxiliary power supply voltage detection module 23 is respectively connected to the gun head of the first charging gun 26 and the first control unit 21, and is used to detect the auxiliary power supply voltage at the connection between the first charging gun 26 and the vehicle socket, and send the detection result to the first control unit 21; the second auxiliary power supply voltage detection module 24 is respectively connected to the gun head of the second charging gun 27 and the second control unit 22, and is used to detect the auxiliary power supply voltage at the connection between the second charging gun 27 and the vehicle socket, and send the detection result to the second control unit 22; similarly, the structure of the charging terminal 30 is the same as that of the charging terminal 20, and will not be repeated here.

[0107] It should be noted that the first charging gun 26 may also be called a first charging interface 26 , and the second charging gun 27 may also be called a second charging interface 27 , and they represent the same physical entities.

[0108] In a possible implementation, the first auxiliary power supply voltage detection module 23 may be integrated into the first control unit 21 , and the second auxiliary power supply voltage detection module 24 may be integrated into the second control unit 22 .

[0109] It should be noted that the split-type charging device 300 may include multiple charging terminals, and the specific number is not limited. Figure 3 The structure of two charging terminals 20 and 30 and their connection diagram with the charging host 10 are shown. The structure of other charging terminals not shown and their interaction with the charging host 10 are the same as those of the charging terminals 20 and 30.

[0110] In actual application, please refer to Figure 2 and Figure 3Taking the connection of the first charging gun 26 to the vehicle as an example, once the connection is successful, the first control unit 21 powers on the first auxiliary power supply 25. The first control unit 21 communicates with the vehicle's battery management system (BMS) to obtain charging information such as the vehicle's battery capacity, maximum battery voltage, and maximum current. The first control unit 21 transmits this charging information to the main control module 12. Upon receiving the vehicle's charging information, the main control module 12 controls the power supply module 11 to output the corresponding charging current. This current is then transmitted to the first charging gun 26 via the power cable 40, thereby charging the vehicle.

[0111] In one possible embodiment, the power supply module 11 includes a rectifier module and a charging module. The rectifier module is used to convert the alternating current output from the grid side into a first direct current. The first direct current output from the rectifier module is input to the charging module through a cable, and the charging module is used to perform power conversion on the first direct current and output a second direct current. In a specific implementation, the rectifier module includes a plurality of AC-DC conversion units, and the charging module includes a plurality of DC-DC conversion units, and the output end of the DC-DC conversion unit is connected to a switch. The main control module 12 is used to receive the charging information of the vehicle, and based on the charging information of the vehicle, control the on and off of different switches so that different DC-DC conversion units are output in parallel, so that the power supply module 11 outputs a second direct current that matches the charging information of the vehicle.

[0112] It should be noted that the output end of a DC-DC conversion unit is connected to at least one switch.

[0113] In another possible embodiment, the power supply module 11 includes a rectifier module. The rectifier module includes multiple AC-DC converter units, with the outputs of the AC-DC converter units connected to switches. The main control module 12 controls the on / off switching of the various switches based on the vehicle's charging information, enabling the various AC-DC converter units to output in parallel. This allows the power supply module 11 to output a second DC power that matches the vehicle's charging information.

[0114] It should be noted that the output end of an AC-DC conversion unit is connected to at least one switch.

[0115] Next, the principle of the split-type charging device 300 dual-charger simultaneous charging is explained in detail. Figure 4 , Figure 4 (a) is a schematic diagram of the contacts of a DC charging vehicle plug (charging gun head) in the national standard GB / T20234.3-2015. Figure 4 (b) is a schematic diagram of the contacts of the DC charging vehicle socket in the national standard GB / T20234.3-2015. Figure 4 (c) is a diagram showing the connection between the contacts of the vehicle socket and the vehicle battery pack and BMS. Figure 4As shown in (c), DC+ and DC- represent the positive and negative poles of the DC power supply, respectively. DC+ is connected to the positive pole of the battery pack, and DC- is connected to the negative pole of the battery pack. S+ and S- represent CAN_H and CAN_L of the charging communication, respectively, which are the communication lines connecting the BMS and the charging pile. CC1 is connected to the charging pile side, and the CC1 signal corresponds to Figure 1 The voltage change signal of detection point 1 in the charging pile determines whether the vehicle and the charging gun are successfully connected by detecting the CC1 signal at this contact; CC2 is connected to the BMS on the vehicle side, and the CC2 signal corresponds to Figure 1 The voltage change signal of detection point 2 is detected by the BMS. The BMS determines whether the vehicle and the charging gun are successfully connected by detecting the CC2 signal at this contact; A+ and A- represent the positive and negative poles of the auxiliary power supply respectively, which are connected to the BMS to power the BMS. When the contact of the charging gun head is coupled with the contact of the vehicle socket, the charging pile and the electric vehicle are connected through the control guidance circuit (such as Figure 1 The split-type charging device 300 provided in this application complies with national standards, and the charging guns connected to the charging terminals 20, 30, etc. comply with the definition of national standard GB / T20234.3-2015.

[0116] For the convenience of explanation, the contacts of the gun head of the first charging gun 26 are defined as: first auxiliary power supply contacts (A+, A-), first DC power supply contacts (DC+, DC-), first communication contacts (S+, S-), and first charging connection confirmation contacts (CC1); the contacts of the gun head of the second charging gun 27 are defined as: second auxiliary power supply contacts (A+, A-), second DC power supply contacts (DC+, DC-), second communication contacts (S+, S-), and second charging connection confirmation contacts (CC1).

[0117] When an electric vehicle has two vehicle sockets, electric vehicles that support dual-charger charging can be divided into four types according to the connection method of A+, A-, S+, S- on the two vehicle sockets and BMS:

[0118] Model 1: The A+ and A- of the two vehicle sockets are connected in parallel, and the S+ and S- are connected in parallel;

[0119] Model 2: The A+ and A- of the two vehicle sockets are connected in parallel, while the S+ and S- are not connected in parallel. The main and auxiliary sockets are marked on the vehicle.

[0120] Vehicle Type 3: The S+ and S- sockets of the two vehicles are connected in parallel, while the A+ and A- sockets are not connected in parallel. The main and auxiliary sockets are marked on the vehicle.

[0121] Vehicle Type 4: The S+ and S- of the two vehicle sockets are not connected in parallel, and the A+ and A- are not connected in parallel. The main and auxiliary sockets are marked on the vehicle.

[0122] Dual-gun charging process for vehicle type 1:

[0123] Take the first charging gun 26 and the second charging gun 27 connected to the charging terminal 20 as an example and plug them into the vehicle socket. Figure 1 、 Figure 3 、 Figure 4 and Figure 5 , the dual-gun charging process of the split-type charging device 300 for vehicle type 1 is described. Figure 5 This is a schematic diagram of the charging gun and the plug-in interface with the vehicle socket of vehicle model 1. The two vehicle sockets of vehicle model 1 are connected A1+ and A2+, A1- and A2-, S1+ and S2+, and S1- and S2-.

[0124] The first charging gun 26 is plugged into the vehicle socket 1, and the second charging gun 27 is plugged into the vehicle socket 2. The first control unit 21 detects whether the first charging gun 26 is successfully plugged into the vehicle socket 1, and the second control unit 22 detects whether the second charging gun 27 is successfully plugged into the vehicle socket 2. When the first control unit 21 detects that the voltage of the first charging connection confirmation contact is 4V, it determines that the first charging gun 26 is successfully plugged into the vehicle socket 1. Similarly, when the second control unit 22 detects that the voltage of the second charging connection confirmation contact is 4V, it determines that the second charging gun 27 is successfully plugged into the vehicle socket 2. The first control unit 21 and the second control unit 22 respectively send signals to the main control module 12 indicating that the first charging gun 26 and the second charging gun 27 are successfully plugged into the vehicle socket.

[0125] After inserting the first charging gun 26 and the second charging gun 27 into vehicle socket 1 and vehicle socket 2, respectively, the user initiates charging. Upon receiving the charging start signal, the first control unit 21 connects the auxiliary power supply circuit between the first auxiliary power supply 25 and vehicle socket 1. At this point, the first auxiliary power supply contacts connect to A1+ and A1- on vehicle socket 1, thereby connecting the first auxiliary power supply 25 to the BMS. After the auxiliary power supply circuit between the auxiliary power supply 25 and vehicle socket 1 is connected, the charging device 300 detects a first voltage signal from the first auxiliary power supply contact. The first voltage signal includes a first voltage value and a first time value. The first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time at which the charging device 300 acquires the first voltage value.

[0126] Specifically, the first auxiliary power supply voltage detection module 23 detects a first voltage value U1 of the first auxiliary power supply contact and sends U1 to the first control unit 21. After receiving U1, the first control unit 21 records the time T1 of receiving U1 and sends U1 and T1 to the main control module 12.

[0127] In a possible implementation, the user may start charging by scanning a QR code located on the first charging gun 26 or the second charging gun 27 .

[0128] In a possible implementation, the user may select the first charging gun 26 or the second charging gun 27 to start charging through the human-computer interaction interface of the charging terminal 20 .

[0129] In one possible implementation, the user may use a charging app / charging applet to start charging.

[0130] This application does not limit the method by which the user initiates charging. For ease of explanation, the embodiment of this application is described in detail by taking the example of a user initiating charging by scanning a QR code located on the first charging gun 26 or the second charging gun 27.

[0131] Please continue reading Figure 5 When the auxiliary power supply circuit between first auxiliary power supply 25 and vehicle socket 1 is connected, A1+ and A1- of vehicle socket 1 are energized. Because A1+ and A1- of vehicle socket 1 are connected in parallel with A2+ and A2- of vehicle socket 2, A2+ and A2- of vehicle socket 2 are also energized almost simultaneously. Consequently, an open-circuit voltage exists between A2+ and A2- of vehicle socket 2, and its value is approximately equal to that of U1.

[0132] The charging device 300 detects a second voltage signal of the second auxiliary power supply contact, wherein the second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0133] Specifically, the second auxiliary power supply voltage detection module 24 detects the second voltage value U2 of the second auxiliary power supply contact and sends U2 to the second control unit 22. After receiving U2, the second control unit 22 records the time T2 of receiving U2 and sends U2 and T2 to the main control module 12.

[0134] The charging device 300 determines whether to enable the first DC power supply contact and the second DC power supply contact to simultaneously output current to charge the vehicle based on the first voltage signal and the second voltage signal.

[0135] In one possible implementation, after receiving U1 and T1 from the first control unit 21 and U2 and T2 from the second control unit 22, the main control module 12 determines whether the first charging connector 26 and the second charging connector 27 are connected to the same vehicle. Specifically, in response to the absolute value of the difference between U1 and U2 being within a first preset threshold, and the absolute value of the difference between T1 and T2 being within a second preset threshold, the charging device 300 causes the first and second DC power contacts to simultaneously output current to charge the vehicle.

[0136] For the convenience of description, in the following, |U2-U1| represents the absolute value of the difference between U2 and U1, and |T2-T1| represents the absolute value of the difference between T2 and T1.

[0137] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1s, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0138] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1.5s, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0139] The main control module 12 labels the first charging gun 26 as gun 1 and the second charging gun 27 as gun 2. For ease of explanation, in this embodiment, gun 1 represents the primary gun and gun 2 represents the secondary gun. During the subsequent charging process, the communication line on the charging gun corresponding to the primary gun is responsible for communicating with the vehicle to obtain the vehicle's charging requirements.

[0140] In actual application, the charging device 300 further includes a power supply module 11, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0141] During the subsequent charging process, the first control unit 21 corresponding to the first charging gun 26 communicates with the vehicle's BMS to obtain the vehicle's charging requirements and sends this information to the main control module 12. The main control module 12 then allocates the output voltage and current for the first and second charging guns 26, 27 based on the obtained charging requirements. The main control module 12 sends a charging signal to the power supply module 11. Upon receiving the signal, the power supply module 11 outputs the corresponding charging voltage and current to the first and second charging guns 26, 27, enabling the first and second charging guns 26, 27 to charge the same vehicle simultaneously.

[0142] Dual-gun charging process for vehicle type 2:

[0143] Take the first charging gun 26 and the second charging gun 27 connected to the charging terminal 20 as an example and plug them into the vehicle socket. Figure 1 、 Figure 3 、 Figure 4 and Figure 6 , the dual-gun charging process of the split-type charging device 300 for vehicle type 2 is described. Figure 6 Schematic diagram of the interface between the charging gun and the vehicle socket of vehicle model 2.

[0144] like Figure 6 As shown, A1+ and A2+ of the two vehicle sockets are connected, and A1- and A2- are connected; S1+ and S1- of vehicle socket 1 are connected to the BMS, which is the main vehicle socket; S2+ and S2- of vehicle socket 2 are not connected to the BMS and are in a suspended state, which is the auxiliary vehicle socket.

[0145] First charging gun 26 is plugged into vehicle socket 1, and second charging gun 27 is plugged into vehicle socket 2. First control unit 21 detects whether first charging gun 26 is successfully plugged into vehicle socket 1, and second control unit 22 detects whether second charging gun 27 is successfully plugged into vehicle socket 2. When first control unit 21 detects that the voltage on the first charging connection confirmation contact is 4V, it determines that first charging gun 26 is successfully plugged into vehicle socket 1. Similarly, when second control unit 22 detects that the voltage on the second charging connection confirmation contact is 4V, it determines that second charging gun 27 is successfully plugged into vehicle socket 2. First control unit 21 and second control unit 22, respectively, send signals indicating that first charging gun 26 and second charging gun 27 are successfully plugged into vehicle sockets to main control module 12.

[0146] The user initiates charging by scanning a QR code located on the first charging plug 26, which is the charging plug that plugs into the main vehicle socket. Upon receiving the charging start signal, the first control unit 21 connects the auxiliary power supply circuit between the first auxiliary power supply 25 and the vehicle socket 1. At this point, the first auxiliary power supply contacts connect to the A1+ and A1- terminals of the vehicle socket 1, thereby connecting the first auxiliary power supply 25 to the BMS. After the auxiliary power supply circuit between the auxiliary power supply 25 and the vehicle socket 1 is connected, the charging device 300 detects a first voltage signal from the first auxiliary power supply contact. The first voltage signal includes a first voltage value and a first time value. The first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device 300 acquires the first voltage value.

[0147] Specifically, the first auxiliary power supply voltage detection module 23 detects a first voltage value U1 of the first auxiliary power supply contact and sends U1 to the first control unit 21. After receiving U1, the first control unit 21 records the time T1 of receiving U1 and sends U1 and T1 to the main control module 12.

[0148] In a possible implementation, the user may start charging by scanning a QR code located on the first charging gun 26 .

[0149] In a possible implementation, the user may select the first charging gun 26 through the human-computer interaction interface of the charging terminal 20 to start charging.

[0150] In one possible implementation, the user may use a charging app / charging applet to start charging.

[0151] This application does not limit the method by which the user initiates charging. For ease of explanation, the embodiment of this application is described in detail by taking the example of a user initiating charging by scanning a QR code located on the first charging gun 26.

[0152] Please continue reading Figure 6 When the auxiliary power supply circuit between first auxiliary power supply 25 and vehicle socket 1 is connected, A1+ and A1- of vehicle socket 1 are energized. Because A1+ and A1- of vehicle socket 1 are connected in parallel with A2+ and A2- of vehicle socket 2, A2+ and A2- of vehicle socket 2 are also energized almost simultaneously. Consequently, an open-circuit voltage exists between A2+ and A2- of vehicle socket 2, and its value is approximately equal to that of U1.

[0153] The charging device 300 detects a second voltage signal of the second auxiliary power supply contact, wherein the second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0154] Specifically, the second auxiliary power supply voltage detection module 24 detects the second voltage value U2 of the second auxiliary power supply contact and sends U2 to the second control unit 22. After receiving U2, the second control unit 22 records the time T2 of receiving U2 and sends U2 and T2 to the main control module 12.

[0155] The charging device 300 determines whether to enable the first DC power supply contact and the second DC power supply contact to simultaneously output current to charge the vehicle based on the first voltage signal and the second voltage signal.

[0156] In one possible implementation, after receiving U1 and T1 from the first control unit 21 and U2 and T2 from the second control unit 22, the main control module 12 determines whether the first charging connector 26 and the second charging connector 27 are connected to the same vehicle. Specifically, in response to the absolute value of the difference between U1 and U2 being within a first preset threshold, and the absolute value of the difference between T1 and T2 being within a second preset threshold, the charging device 300 causes the first and second DC power contacts to simultaneously output current to charge the vehicle.

[0157] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1s, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0158] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1.5s, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0159] The main control module 12 marks the first charging gun 26 as gun #1 and the second charging gun 27 as gun #2.

[0160] In actual application, the charging device 300 further includes a power supply module 11, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0161] During the subsequent charging process, the first control unit 21 corresponding to the first charging gun 26 communicates with the vehicle's BMS to obtain the vehicle's charging requirements and sends this information to the main control module 12. The main control module 12 then allocates the output voltage and current for the first and second charging guns 26, 27 based on the obtained charging requirements. The main control module 12 sends a charging signal to the power supply module 11. Upon receiving the signal, the power supply module 11 outputs the corresponding charging voltage and current to the first and second charging guns 26, 27, enabling the first and second charging guns 26, 27 to charge the same vehicle simultaneously.

[0162] Dual-gun charging process for Model 3:

[0163] Take the first charging gun 26 and the second charging gun 27 connected to the charging terminal 20 as an example and plug them into the vehicle socket. Figure 1 、 Figure 3 、 Figure 4 and Figure 7 , the dual-gun charging process of the split-type charging device 300 for vehicle type 3 is described. Figure 7 Schematic diagram of the interface between the charging gun and the vehicle socket of Model 3.

[0164] like Figure 7 As shown, S1+ and S2+ of the two vehicle sockets are connected, and S1- and S2- are connected; A1+ and A1- of vehicle socket 1 are connected to the BMS, which is the main vehicle socket; A2+ and A2- of vehicle socket 2 are not connected to the BMS and are in a suspended state, which is the auxiliary vehicle socket.

[0165] First charging gun 26 is plugged into vehicle socket 1, and second charging gun 27 is plugged into vehicle socket 2. First control unit 21 detects whether first charging gun 26 is successfully plugged into vehicle socket 1, and second control unit 22 detects whether second charging gun 27 is successfully plugged into vehicle socket 2. When first control unit 21 detects that the voltage on the first charging connection confirmation contact is 4V, it determines that first charging gun 26 is successfully plugged into vehicle socket 1. Similarly, when second control unit 22 detects that the voltage on the second charging connection confirmation contact is 4V, it determines that second charging gun 27 is successfully plugged into vehicle socket 2. First control unit 21 and second control unit 22, respectively, send signals indicating that first charging gun 26 and second charging gun 27 are successfully plugged into vehicle sockets to main control module 12.

[0166] The user initiates charging by scanning a QR code located on the first charging plug 26, which is the charging plug that plugs into the main vehicle socket. Upon receiving the charging start signal, the first control unit 21 connects the auxiliary power supply circuit between the first auxiliary power supply 25 and the vehicle socket 1. At this point, the first auxiliary power supply contacts connect to the A1+ and A1- terminals of the vehicle socket 1, thereby connecting the first auxiliary power supply 25 to the BMS. After the auxiliary power supply circuit between the auxiliary power supply 25 and the vehicle socket 1 is connected, the charging device 300 detects a first voltage signal from the first auxiliary power supply contact. The first voltage signal includes a first voltage value and a first time value. The first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device 300 acquires the first voltage value.

[0167] Specifically, the first auxiliary power supply voltage detection module 23 detects a first voltage value U1 of the first auxiliary power supply contact and sends U1 to the first control unit 21. After receiving U1, the first control unit 21 records the time T1 of receiving U1 and sends U1 and T1 to the main control module 12.

[0168] In a possible implementation, the user may start charging by scanning a QR code located on the first charging gun 26 .

[0169] In a possible implementation, the user may select the first charging gun 26 through the human-computer interaction interface of the charging terminal 20 to start charging.

[0170] In one possible implementation, the user may use a charging app / charging applet to start charging.

[0171] This application does not limit the method by which the user initiates charging. For ease of explanation, the embodiment of this application is described in detail by taking the example of a user initiating charging by scanning a QR code located on the first charging gun 26.

[0172] Because A2+ and A2- of vehicle socket 2 are left floating and unconnected to the BMS, and the auxiliary power supply circuit between the first auxiliary power supply 25 and vehicle socket 2 is disconnected, the second auxiliary power supply voltage detection module 24 cannot detect the voltage of the second auxiliary power supply contact. In other words, the main control module 12 cannot obtain the second voltage signal of the second auxiliary power supply contact, and therefore cannot determine whether the first charging plug 26 and the second charging plug 27 are connected to the same vehicle by comparing the first and second voltage signals.

[0173] Specifically, after the main control module 12 receives U1 and T1 sent by the first control unit 21 , if it does not receive U2 and T2 sent by the second control unit 22 within a preset time, the main control module 12 determines that a timeout has occurred.

[0174] In a possible implementation, after the main control module 12 receives U1 and T1 sent by the first control unit 21 , if it does not receive U2 and T2 sent by the second control unit 22 within 10 seconds, the main control module 12 determines that a timeout has occurred.

[0175] In response to the main control module 12 obtaining the first voltage signal, the charging device 300 obtains the first communication signal of the first communication contact and the second communication signal of the second communication contact, and determines whether to enable the first charging gun 26 and the second charging gun 27 to output current simultaneously to charge the vehicle based on the first communication signal and the second communication signal.

[0176] The first communication signal includes first charging information, which includes a first vehicle handshake message and a first vehicle identification message; the second communication signal includes second charging information, which includes a second vehicle handshake message and a second vehicle identification message.

[0177] Specifically, the first control unit 21 establishes a communication connection with the vehicle's BMS via the first communication contact, allowing it to communicate with the vehicle's BMS. The first control unit 21 sends the CHM and CRM to the BMS; after receiving the CHM and CRM, the BMS sends the vehicle's BHM and BRM to the first control unit 21 via the first communication contact. The first control unit 21 sends the received BHM and BRM to the main control module 12. Furthermore, because S2+ and S2- of vehicle socket 2 are connected in parallel with S1+ and S1- of vehicle socket 1, the vehicle's BHM and BRM sent by the BMS can be transmitted to the second control unit 22 via the communication cable between the BMS and the second control unit. In other words, the second control unit 22 can obtain the vehicle's BHM and BRM via the second communication contact. After the second control unit 22 obtains the vehicle's BHM and BRM, it sends the BHM and BRM to the main control module 12. After the main control module 12 receives the BHM and BRM sent by the first control unit 21 and the second control unit 22, it determines whether to enable the first DC power supply contact and the second DC power supply contact to simultaneously output current to charge the vehicle based on the BHM and BRM sent by the first control unit 21 and the BHM and BRM sent by the second control unit 22.

[0178] The BHM contains the allowable charging voltage information of the BMS, and the BRM contains the vehicle's battery type, battery rated capacity, battery rated voltage, and vehicle identification number (VIN) information.

[0179] In one possible implementation, the main control module 12 determines whether the first charging gun 26 and the second charging gun 27 are connected to the same vehicle based on the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM sent by the first control unit 21 are the same as the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM sent by the second control unit 22, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0180] In one possible implementation, the main control module 12 determines whether the first charging gun 26 and the second charging gun 27 are connected to the same vehicle based on the vehicle identification code (VIN). Specifically, if the VIN included in the BHM and BRM sent by the first control unit 21 is the same as the VIN included in the BHM and BRM sent by the second control unit 22, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0181] The main control module 12 marks the first charging gun 26 as gun #1 and the second charging gun 27 as gun #2.

[0182] In actual application, the charging device 300 further includes a power supply module 11, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0183] During the subsequent charging process, the first control unit 21 corresponding to the first charging gun 26 communicates with the vehicle's BMS to obtain the vehicle's charging requirements and sends this information to the main control module 12. The main control module 12 then allocates the output voltage and current for the first and second charging guns 26, 27 based on the obtained charging requirements. The main control module 12 sends a charging signal to the power supply module 11. Upon receiving the signal, the power supply module 11 outputs the corresponding charging voltage and current to the first and second charging guns 26, 27, enabling the first and second charging guns 26, 27 to charge the same vehicle simultaneously.

[0184] Dual-gun charging process for model 4:

[0185] Take the first charging gun 26 and the second charging gun 27 connected to the charging terminal 20 as an example and plug them into the vehicle socket. Figure 1 、 Figure 3 、 Figure 4 and Figure 8 , the dual-gun charging process of the split-type charging device 300 for vehicle type 4 is described. Figure 8 Schematic diagram of the interface between the charging gun and the vehicle socket of vehicle model 4.

[0186] like Figure 8 As shown, A1+, A1-, S1+, and S1- of vehicle socket 1 are connected to the BMS, which is the main vehicle socket; A2+, A2-, S2+, and S2- of vehicle socket 2 are not connected to the BMS and are in a suspended state, which is the auxiliary vehicle socket.

[0187] First charging gun 26 is plugged into vehicle socket 1, and second charging gun 27 is plugged into vehicle socket 2. First control unit 21 detects whether first charging gun 26 is successfully plugged into vehicle socket 1, and second control unit 22 detects whether second charging gun 27 is successfully plugged into vehicle socket 2. When first control unit 21 detects that the voltage on the first charging connection confirmation contact is 4V, it determines that first charging gun 26 is successfully plugged into vehicle socket 1. Similarly, when second control unit 22 detects that the voltage on the second charging connection confirmation contact is 4V, it determines that second charging gun 27 is successfully plugged into vehicle socket 2. First control unit 21 and second control unit 22, respectively, send signals indicating that first charging gun 26 and second charging gun 27 are successfully plugged into vehicle sockets to main control module 12.

[0188] The user initiates charging by scanning a QR code located on the first charging plug 26, which is the charging plug that plugs into the main vehicle socket. Upon receiving the charging start signal, the first control unit 21 connects the auxiliary power supply circuit between the first auxiliary power supply 25 and the vehicle socket 1. At this point, the first auxiliary power supply contacts connect to the A1+ and A1- terminals of the vehicle socket 1, thereby connecting the first auxiliary power supply 25 to the BMS. After the auxiliary power supply circuit between the auxiliary power supply 25 and the vehicle socket 1 is connected, the charging device 300 detects a first voltage signal from the first auxiliary power supply contact. The first voltage signal includes a first voltage value and a first time value. The first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device 300 acquires the first voltage value.

[0189] Specifically, the first auxiliary power supply voltage detection module 23 detects a first voltage value U1 of the first auxiliary power supply contact and sends U1 to the first control unit 21. After receiving U1, the first control unit 21 records the time T1 of receiving U1 and sends U1 and T1 to the main control module 12.

[0190] In a possible implementation, the user may start charging by scanning a QR code located on the first charging gun 26 .

[0191] In a possible implementation, the user may select the first charging gun 26 through the human-computer interaction interface of the charging terminal 20 to start charging.

[0192] In one possible implementation, the user may use a charging app / charging applet to start charging.

[0193] This application does not limit the method by which the user initiates charging. For ease of explanation, the embodiment of this application is described in detail by taking the example of a user initiating charging by scanning a QR code located on the first charging gun 26.

[0194] Because A2+ and A2- of vehicle socket 2 are left floating and unconnected to the BMS, and the auxiliary power supply circuit between the first auxiliary power supply 25 and vehicle socket 2 is disconnected, the second auxiliary power supply voltage detection module 24 cannot detect the voltage U2 of the second auxiliary power supply contact. In other words, the main control module 12 cannot obtain the second voltage signal of the second auxiliary power supply contact, and thus cannot determine whether the first charging plug 26 and the second charging plug 27 are connected to the same vehicle by comparing the first and second voltage signals.

[0195] Specifically, after the main control module 12 receives U1 and T1 sent by the first control unit 21 , if it does not receive U2 and T2 sent by the second control unit 22 within a preset time, the main control module 12 determines that a timeout has occurred.

[0196] In a possible implementation, after the main control module 12 receives U1 and T1 sent by the first control unit 21 , if it does not receive U2 and T2 sent by the second control unit 22 within 10 seconds, the main control module 12 determines that a timeout has occurred.

[0197] In response to the main control module 12 obtaining the first voltage signal, the charging device 300 obtains the first communication signal of the first communication contact and the second communication signal of the second communication contact, and determines whether to enable the first charging gun 26 and the second charging gun 27 to output current simultaneously to charge the vehicle based on the first communication signal and the second communication signal.

[0198] The first communication signal includes first charging information, which includes a first vehicle handshake message and a first vehicle identification message; the second communication signal includes second charging information, which includes a second vehicle handshake message and a second vehicle identification message.

[0199] Specifically, the first control unit 21 establishes a communication connection with the vehicle's BMS through the first communication contact, so that it can communicate with the vehicle's BMS. The first control unit 21 sends the CHM and CRM to the BMS; after the BMS receives the CHM and CRM, it sends the vehicle's BHM and BRM to the first control unit 21 through the first communication contact. The first control unit 21 sends the received BHM and BRM to the main control module 12. Since S2+ and S2- of the vehicle socket 2 are suspended and not connected to the BMS, the second control unit 22 cannot communicate with the BMS. The second control unit 22 cannot obtain the vehicle's BHM and BRM, and thus cannot send the vehicle's BHM and BRM to the main control module 12.

[0200] The main control module 12 only receives the first communication signal of the first communication contact and cannot receive the second communication signal of the second communication contact, and determines that it cannot determine whether the first charging gun 26 and the second charging gun 27 are plugged into the same vehicle based on the first communication signal and the second communication signal.

[0201] Specifically, after the main control module 12 receives the first communication signal, if it does not receive the second communication signal within a preset time, the main control module 12 determines that a timeout has occurred.

[0202] In a possible implementation, after the main control module 12 receives the first communication signal, if the main control module 12 does not receive the second communication signal within 10 seconds, the main control module 12 determines that a timeout has occurred.

[0203] The human-computer interaction interface of the charging terminal 20, or the charging APP, or the charging applet displays a message that only single-gun charging is possible and that the user needs to manually pair. The user can choose single-gun charging or manual pairing.

[0204] Please refer to Figure 2 and Figure 8 It should be noted that after the first charging gun 26 and the second charging gun 27 are successfully connected to the vehicle socket 1 and the vehicle socket 2, respectively, even if the first charging gun 26 and the second charging gun 27 are not successfully paired, the first control unit 21 can still communicate with the BMS. The BMS and the first control unit 21 communicate with each other, and after the charging parameters are configured, the main control module 12 controls the power supply module 11 to output current so that the first charging gun 26 outputs current to charge the vehicle. Therefore, even if the main control module 12 cannot determine whether the first charging gun 26 and the second charging gun 27 are connected to the same vehicle, the first charging gun 26 may still have entered the charging process and output current to charge the vehicle.

[0205] In specific implementation, the user can know whether the first charging gun 26 is charging the vehicle through the charging APP, the charging applet, or the human-computer interaction interface on the charging terminal.

[0206] If the user chooses single-charger charging, the user does not need to unplug the first charging gun 26. The first charging gun 26 plugged into the vehicle socket 1 outputs current to charge the vehicle.

[0207] If the user chooses manual pairing and the first charging gun 26 is already outputting current to charge the vehicle, the user can choose to stop charging through the charging APP, charging applet, or the human-computer interaction interface on the charging terminal to stop the first charging gun 26 from outputting current to charge the vehicle.

[0208] When the user learns through the charging app, charging applet, or the human-computer interaction interface on the charging terminal that the first and second charging guns have no output current, they unplug the two guns and perform manual pairing.

[0209] In practice, the first charging gun 26 includes a first electronic locking device, and the second charging gun 27 includes a second electronic locking device. Once the charging gun is successfully connected to the vehicle, the electronic locking device locks the charging gun, ensuring a secure connection between the charging gun and the vehicle socket. This prevents the charging gun from shifting or falling out due to a loose connection, thereby ensuring a safe charging process.

[0210] When neither the first charging gun 26 nor the second charging gun 27 outputs current to charge the vehicle, the first control unit 21 and the second control unit 22 respectively send unlocking permission signals to the first electronic locking device and the second electronic locking device, thereby unlocking the first charging gun 26 and the second charging gun 27, so that the user can unplug the charging gun from the vehicle socket.

[0211] After the user unplugs the first charging gun 26 and the second charging gun 27 from the vehicle socket, the user presses the buttons of the two charging guns simultaneously for X seconds and then releases them, or presses the buttons of the two charging guns simultaneously for Y times to pair the first charging gun 26 and the second charging gun 27.

[0212] Specifically, see Figure 1 and Figure 9 When the charging gun is not plugged into the vehicle socket, the switch S in the charging control pilot circuit is normally closed, and the voltage at detection point 1 is 6V. When the button of the charging gun is pressed, the switch S in the charging control pilot circuit is disconnected, causing the resistor R2 to be disconnected from the circuit, resulting in the voltage at detection point 1 becoming 12V. When the button is released, the switch S is closed again, the resistor R2 is connected to the circuit, and the voltage at detection point 1 becomes 6V again. In other words, every time the button of the charging gun is pressed and released, the voltage at detection point 1 changes from 6V to 12V to 6V. In other words, the voltage of CC1 detected by the charging device (charging connection signal) changes from 6V to 12V to 6V.

[0213] In a possible implementation, when the user simultaneously presses the buttons of the first charging gun 26 and the second charging gun 27 for X seconds and then releases them, the voltage of the first charging connection confirmation contact and the voltage of the second charging connection confirmation contact will both change from 6V to 12V to 6V. Figure 10 , Figure 10 (a) is a schematic diagram of the voltage change of the first charging connection confirmation contact;

[0214] Figure 10(b) is a schematic diagram of the voltage change of the second charging connection confirmation contact. The first control unit 21 detects the voltage of the first charging connection confirmation contact and sends the detection result to the main control module 12. Similarly, the second control unit 22 detects the voltage of the second charging connection confirmation contact and sends the detection result to the main control module 12. The main control module 12 compares the voltage change signal of the first charging connection confirmation contact with the voltage change signal of the second charging connection confirmation contact (both are PWM signals). If the absolute value of the time difference between the rising edge |t1| and the absolute value of the time difference between the falling edge |t2| of the two sets of signals are both within the preset threshold, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are plugged into the same vehicle.

[0215] Exemplarily, in response to the values ​​of |t1| and |t2| being less than or equal to 1 second, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are successfully paired.

[0216] It should be noted that the present application does not limit the time length X seconds for the user to simultaneously press the buttons of the first charging gun 26 and the second charging gun 27 , and it can be 3 seconds, 5 seconds, 10 seconds, etc.

[0217] In another possible implementation, the user presses the buttons of the first charging gun 26 and the second charging gun 27 Y times simultaneously to pair the first charging gun 26 and the second charging gun 27. For the sake of convenience, the pairing principle is explained by taking the case where the user presses the buttons of the first charging gun 26 and the second charging gun 27 twice simultaneously as an example. Figure 11 , Figure 11 (a) is a schematic diagram of the voltage change of the first charging connection confirmation contact; Figure 11 (b) is a schematic diagram of the voltage change of the second charging connection confirmation contact. When the user presses the buttons of the first charging gun 26 and the second charging gun 27 twice simultaneously, the first control unit 21 detects the voltage of the first charging connection confirmation contact and sends the detection result to the main control module 12. Similarly, the second control unit 22 detects the voltage of the second charging connection confirmation contact and sends the detection result to the main control module 12. The main control module 12 compares the voltage change signal of the first charging connection confirmation contact with the voltage change signal of the second charging connection confirmation contact (both PWM signals). If the absolute values ​​of the rising edge time difference |t1| and |t3| and the absolute values ​​of the falling edge time difference |t2| and |t4| of the two sets of signals are within the preset thresholds, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0218] In one possible implementation, in response to the values ​​of |t1|, |t2|, |t3|, and |t4| being less than or equal to 1 second, the main control module 12 determines that the first charging gun 26 and the second charging gun 27 are connected to the same vehicle.

[0219] It should be noted that the user pressing the buttons of the first charging gun 26 and the second charging gun 27 twice simultaneously is only an example. In actual application, the number of times the buttons are pressed is not limited.

[0220] First charging gun 26 is plugged into vehicle socket 1, and second charging gun 27 is plugged into vehicle socket 2. First control unit 21 detects whether first charging gun 26 is successfully plugged into vehicle socket 1, and second control unit 22 detects whether second charging gun 27 is successfully plugged into vehicle socket 2. When first control unit 21 detects that the voltage on the first charging connection confirmation contact is 4V, it determines that first charging gun 26 is successfully plugged into vehicle socket 1. Similarly, when second control unit 22 detects that the voltage on the second charging connection confirmation contact is 4V, it determines that second charging gun 27 is successfully plugged into vehicle socket 2. First control unit 21 and second control unit 22, respectively, send signals indicating that first charging gun 26 and second charging gun 27 are successfully plugged into vehicle sockets to main control module 12.

[0221] The user initiates charging by scanning the QR code located on the first charging gun 26, which is the charging gun that is plugged into the main vehicle socket. When the first control unit 21 receives the signal to start charging, the first control unit 21 connects the auxiliary power supply circuit between the first auxiliary power supply 25 and the vehicle socket 1. The first control unit 21 communicates with the BMS to obtain the vehicle's BHM and BRM, and sends the obtained BHM and BRM to the main control module 12. Because S2+ and S2- of the vehicle socket 2 are floating and not connected to the BMS, the second control unit 22 cannot communicate with the BMS, and the main control module 12 cannot obtain the BHM and BRM sent by the second control unit 22.

[0222] The main control module 12 determines that it has only received the BHM and BRM sent by the first control unit 21 , and thus marks the first charging gun 26 as gun #1 and the second charging gun 27 as gun #2.

[0223] During the subsequent charging process, the first control unit 21 corresponding to the first charging gun 26 communicates with the vehicle's BMS to obtain the vehicle's charging requirements and sends this information to the main control module 12. The main control module 12 then allocates the output voltage and current for the first and second charging guns 26, 27 based on the obtained charging requirements. The main control module 12 sends a charging signal to the power supply module 11. Upon receiving the signal, the power supply module 11 outputs the corresponding charging voltage and current to the first and second charging guns 26, 27, enabling the first and second charging guns 26, 27 to charge the same vehicle simultaneously.

[0224] In actual application, the first auxiliary power supply voltage detection module 23 and the second auxiliary power supply voltage detection module 24 can use digital circuits or analog circuits to implement the voltage detection function. Taking the first auxiliary power supply voltage detection module 23 as an example, Figure 12 A schematic diagram of a voltage detection digital circuit is given. Figure 13 A schematic diagram of a voltage detection simulation circuit is provided. One end of the voltage detection module (voltage detection circuit) is connected to the first auxiliary power supply contact, and the other end is connected to the first control unit 21. When the power supply circuit of the first auxiliary power supply 25 is connected, the voltage detection module can detect the voltage of the first auxiliary power supply contact and send the detection result to the first control unit 21.

[0225] in, Figure 12 and Figure 13 The voltage detection circuit diagram given is only an example, and any circuit that can be used to detect voltage is applicable to this application.

[0226] It is understood that the auxiliary power supply voltage detection module can also be used to detect whether the output voltage of the auxiliary power supply is normal. Taking the first auxiliary power supply voltage detection module 23 as an example, after the first control unit 21 receives the voltage value sent by the first auxiliary power supply voltage detection module 23, it compares the received voltage value with the preset normal output voltage value of the first auxiliary power supply 25. If the received voltage value is within the preset normal output voltage value range, the output of the first auxiliary power supply 25 is determined to be normal; if the received voltage value is not within the preset normal output voltage value range, the output of the first auxiliary power supply 25 is determined to be abnormal. When the output of the first auxiliary power supply 25 is determined to be abnormal, the human-computer interface or charging app on the charging terminal 20 can display a first auxiliary power supply 25 output abnormality fault.

[0227] It should be noted that when users choose to use two charging guns to charge an electric vehicle simultaneously, they can choose to connect the two charging guns on the same charging terminal to the vehicle socket, or they can choose to connect one charging gun on each different charging terminal to the vehicle socket. Figure 3As shown, the user can freely choose to connect two of the four charging guns on the charging terminal 20 and the charging terminal 30 to the vehicle socket to achieve dual-gun charging.

[0228] Figure 3 A schematic diagram of a charging terminal with two charging guns is given. In specific implementation, there is no limit on the number of charging guns on each charging terminal, and each charging terminal has at least one charging gun.

[0229] The above-mentioned split charging device can also be used in charging scenarios where multiple guns are charged at the same time. The implementation principle of multiple guns charging at the same time is the same as that of dual guns charging at the same time, which will not be repeated here.

[0230] refer to Figure 14 As shown, an embodiment of the present application provides a charging device 400, including a main control module 401 and a plurality of integrated DC charging devices 402, 403, etc.

[0231] The integrated DC charging device 402 includes a first control unit 4021, a second control unit 4022, a first auxiliary power supply voltage detection module 4023, a second auxiliary power supply voltage detection module 4024, a first auxiliary power supply 4025, a first charging gun 4026, and a second charging gun 4027. Both the first control unit 4021 and the second control unit 4022 are connected to the main control module 401 to facilitate information exchange between the main control module 401 and the integrated charging device 402. The first auxiliary power supply 4025 is used to power the vehicle's BMS when at least one of the first charging gun 4026 and the second charging gun 4027 is successfully connected to the vehicle's socket. The first auxiliary power supply voltage detection module 4023 is respectively connected to the gun head of the first charging gun 4026 and the first control unit 4021, and is used to detect the auxiliary power supply voltage at the connection between the first charging gun 4026 and the vehicle socket, and send the detection result to the first control unit 4021; the second auxiliary power supply voltage detection module 4024 is respectively connected to the gun head of the second charging gun 4027 and the second control unit 4022, and is used to detect the auxiliary power supply voltage at the connection between the second charging gun 4027 and the vehicle socket, and send the detection result to the second control unit 4022.

[0232] In a possible implementation, the first auxiliary power supply voltage detection module 4023 is integrated into the first control unit 4021 , and the second auxiliary power supply voltage detection module 4024 is integrated into the second control unit 4022 .

[0233] The integrated DC charging device 403 includes a third control unit 4031, a third auxiliary power supply voltage detection module 4032, a third auxiliary power supply 4033, and a third charging plug 4034. The third auxiliary power supply voltage detection module 4032 is integrated into the third control unit 4031. The third auxiliary power supply voltage detection module 4032 is connected to the tip of the third charging plug 4034. When the third charging plug 4034 is successfully connected to the vehicle socket, the third auxiliary power supply voltage detection module 4032 is used to detect the auxiliary power supply voltage at the connection point between the third charging plug 4034 and the vehicle socket.

[0234] It should be noted that the charging device 400 may include multiple integrated DC charging devices as described above, with no specific limit on the number; and each integrated DC charging device may have one or more charging guns. The charging gun connected to each integrated charging device complies with the definition of the national standard GB / T20234.3-2015. The contact diagram of the charging gun head is shown in the above diagram. Figure 4 As shown, no further details are given here.

[0235] Taking the integrated DC charging device 402 as an example, the dual-charger charging process of the charging device 400 is described.

[0236] For the convenience of description, the contacts of the gun head of the first charging gun 4026 are defined as: first auxiliary power supply contact (A+, A-), first DC power supply contact (DC+, DC-), first communication contact (S+, S-), and first charging connection confirmation contact (CC1); the contacts of the gun head of the second charging gun 4027 are defined as: second auxiliary power supply contact (A+, A-), second DC power supply contact (DC+, DC-), second communication contact (S+, S-), and second charging connection confirmation contact (CC1).

[0237] Dual-gun charging process for vehicle type 1:

[0238] Please refer to Figure 1 、 Figure 4 、 Figure 14 and Figure 15 , the dual-gun pairing process of the charging device 400 for the above-mentioned vehicle model 1 is described. Figure 15 This is a diagram of the interface between the charging gun and the vehicle socket of Model 1. The two vehicle sockets of Model 1 are connected with A1+ and A2+, A1- and A2-, S1+ and S2+, and S1- and S2-.

[0239] First charging gun 4026 is plugged into vehicle socket 1, and second charging gun 4027 is plugged into vehicle socket 2. First control unit 4021 detects whether first charging gun 4026 is successfully plugged into vehicle socket 1, and second control unit 4022 detects whether second charging gun 4027 is successfully plugged into vehicle socket 2. When first control unit 4021 detects that the voltage on the first charging connection confirmation contact is 4V, it determines that first charging gun 4026 is successfully plugged into vehicle socket 1. Similarly, when second control unit 4022 detects that the voltage on the second charging connection confirmation contact is 4V, it determines that second charging gun 4027 is successfully plugged into vehicle socket 2. First control unit 4021 and second control unit 4022, respectively, send signals indicating that first charging gun 4026 and second charging gun 4027 are successfully plugged into vehicle sockets to main control module 401.

[0240] After inserting the first charging plug 4026 and the second charging plug 4027 into vehicle socket 1 and vehicle socket 2, respectively, the user initiates charging. Upon receiving the charging start signal, the first control unit 4021 connects the auxiliary power supply circuit between the first auxiliary power supply 4025 and vehicle socket 1. At this point, the first auxiliary power supply contacts connect to A1+ and A1- on vehicle socket 1, thereby connecting the first auxiliary power supply 4025 to the BMS. After the auxiliary power supply circuit between the auxiliary power supply 4025 and vehicle socket 1 is connected, the charging device 400 detects a first voltage signal from the first auxiliary power supply contact. The first voltage signal includes a first voltage value and a first time value. The first voltage value represents the voltage of the first auxiliary power supply contact, and the first time value represents the time at which the charging device 400 detects the first voltage value.

[0241] Specifically, the first auxiliary power supply voltage detection module 4023 detects a first voltage value U1 of the first auxiliary power supply contact and sends U1 to the first control unit 4021. After receiving U1, the first control unit 4021 records the time T1 of receiving U1 and sends U1 and T1 to the main control module 401.

[0242] In a possible implementation, the user may start charging by scanning a QR code located on the first charging gun 4026 or the second charging gun 4027 .

[0243] In a possible implementation, the user may select the first charging gun 4026 or the second charging gun 4027 to start charging through the human-machine interface of the integrated DC charging device 402 .

[0244] In one possible implementation, the user may use a charging app / charging applet to start charging.

[0245] This application does not limit the method by which the user initiates charging. For ease of explanation, the embodiment of this application is described in detail by taking the example of a user initiating charging by scanning a QR code on the first charging gun 4026.

[0246] Please continue reading Figure 15 When the auxiliary power supply circuit between the first auxiliary power supply 4025 and the vehicle socket 1 is connected, A1+ and A1- of the vehicle socket 1 are powered on; since A1+ and A1- of the vehicle socket 1 are connected in parallel with A2+ and A2- of the vehicle socket 2, A2+ and A2- of the vehicle socket 2 are also powered on almost simultaneously. Therefore, an open-circuit voltage exists between A2+ and A2- of the vehicle socket 2, and the value of the open-circuit voltage is approximately equal to the value of U1.

[0247] The charging device 400 detects a second voltage signal of the second auxiliary power supply contact, wherein the second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0248] Specifically, the second auxiliary power supply voltage detection module 4024 detects the second voltage value U2 of the second auxiliary power supply contact and sends U2 to the second control unit 4022. After receiving U2, the second control unit 4022 records the time T2 when U2 is received and sends U2 and T2 to the main control module 401.

[0249] The charging device 400 determines whether to enable the first DC power supply contact and the second DC power supply contact to simultaneously output current to charge the vehicle based on the first voltage signal and the second voltage signal.

[0250] In one possible implementation, after receiving U1 and T1 from the first control unit 4021 and U2 and T2 from the second control unit 4022, the main control module 401 determines whether the first charging gun 4026 and the second charging gun 4027 are connected to the same vehicle. Specifically, in response to the absolute value of the difference between U1 and U2 being within a first preset threshold and the absolute value of the difference between T1 and T2 being within a second preset threshold, the charging device 400 causes the first DC power contact and the second DC power contact to simultaneously output current to charge the vehicle.

[0251] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1s, the main control module 401 determines that the first charging gun 4026 and the second charging gun 4027 are connected to the same vehicle.

[0252] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1.5s, the main control module 401 determines that the first charging gun 4026 and the second charging gun 4027 are connected to the same vehicle.

[0253] The main control module 401 marks the first charging gun 4026 as gun #1 and the second charging gun 4027 as gun #2.

[0254] In actual application, the charging device 400 also includes a power supply module 4028, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0255] During the subsequent charging process, the first control unit 4021 corresponding to the first charging gun 4026 communicates with the vehicle's BMS to obtain the vehicle's charging requirements and transmits this information to the main control module 401. Based on this information, the main control module 401 allocates the output voltage and current for the first and second charging guns 4026, 4027. The main control module 401 transmits a charging signal to the power supply module 4028. Upon receiving the signal, the power supply module 4028 outputs the corresponding charging voltage and current to the first and second charging guns 4026, 4027, enabling the first and second charging guns 4026, 4027 to simultaneously charge the same vehicle.

[0256] Similarly, the dual-gun charging process of the charging device 400 for vehicle types 2, 3, and 4 is the same as the above-mentioned dual-gun charging process, which will not be repeated here.

[0257] It should be noted that the charging device 400 can not only realize the pairing of two charging guns located on the same integrated DC charging device, but also realize the pairing of two charging guns located on different integrated DC charging devices.

[0258] refer to Figure 16 As shown, an embodiment of the present application also provides a charging device 600, comprising a main control module 601, a first control unit 602, a first auxiliary power supply voltage detection module 604, a first charging interface 606; a second control unit 603, a second auxiliary power supply voltage detection module 605, and a second charging interface 607. The first charging interface 606 includes a first auxiliary power supply contact 6061, a first DC power supply contact 6062, a first communication contact 6063, and a first charging connection confirmation contact 6064. It should be noted that the first auxiliary power supply contact 6061 is a pair of contacts A1+ and A1-; the first DC power supply contact 6062 is a pair of contacts DC1+ and DC1-; and the first communication contact 6063 is a pair of contacts S1+ and S1-.

[0259] Similarly, the second charging interface 607 includes a second auxiliary power supply contact 6071, a second DC power supply contact 6072, a second communication contact 6073, and a second charging connection confirmation contact 6074. It should be noted that the second auxiliary power supply contact 6071 is a pair of contacts A2+ and A2-; the second DC power supply contact 6072 is a pair of contacts DC2+ and DC2-; and the second communication contact 6073 is a pair of contacts S2+ and S2-.

[0260] The first auxiliary power supply voltage detection module 604 is used to detect the voltage of the first auxiliary power supply contact 6061 ; the second auxiliary power supply voltage detection module 605 is used to detect the voltage of the second auxiliary power supply contact 6071 .

[0261] It should be noted that when the charging device 600 comes with a charging gun, the first charging interface 606 and the second charging interface 607 represent the charging gun; when the charging device 600 is not connected to the charging gun and the user needs to connect the charging gun by himself, the first charging interface 606 and the second charging interface 607 represent the interfaces connected to the charging gun.

[0262] The following describes the dual-gun charging process of the charging device 600:

[0263] Dual-gun charging process for Model 1 and Model 2:

[0264] Take the first charging interface 606 and the second charging interface 607 as an example of connecting to the vehicle socket, please refer to Figure 16 and Figure 17 , the dual-gun charging process of the charging device 600 for vehicle type 1 and vehicle type 2 is described. Figure 17 This is a schematic diagram of the connection interface between the charging port and the vehicle sockets of model 1 and model 2. The two vehicle sockets of model 1 have A1+ and A2+ connected, A1- and A2- connected, S1+ and S2+ connected, and S1- and S2- connected; the two vehicle sockets of model 2 have A1+ and A2+ connected, and A1- and A2- connected; S1+ and S1- of vehicle socket 1 are connected to the BMS, and are the main vehicle sockets; S2+ and S2- of vehicle socket 2 are not connected to the BMS and are in a suspended state, and are the auxiliary vehicle sockets.

[0265] The first charging interface 606 is connected to vehicle socket 1, and the second charging interface 607 is connected to vehicle socket 2. The first control unit 602 detects whether the first charging interface 606 is successfully connected to vehicle socket 1, and the second control unit 603 detects whether the second charging interface 607 is successfully connected to vehicle socket 2. When the first control unit 602 detects that the voltage value of the first charging connection confirmation contact 6064 is 4V, it determines that the first charging interface 606 is successfully connected to vehicle socket 1. Similarly, when the second control unit 603 detects that the voltage value of the second charging connection confirmation contact 6074 is 4V, it determines that the second charging interface 607 is successfully connected to vehicle socket 2. The first control unit 602 and the second control unit 603 respectively send signals to the main control module 601 indicating that the first charging interface 606 and the second charging interface 607 are successfully connected to the vehicle socket.

[0266] After connecting the first charging port 606 and the second charging port 607 to vehicle socket 1 and vehicle socket 2, respectively, the user initiates charging. The auxiliary power supply within the charging device 600 supplies power to the vehicle's BMS via the first auxiliary power supply contact 6061. The charging device 600 detects a first voltage signal from the first auxiliary power supply contact 6061. The first voltage signal includes a first voltage value and a first time value. The first voltage value is the voltage value of the first auxiliary power supply contact 6061, and the first time value is the time when the charging device detects the first voltage value.

[0267] Specifically, the first auxiliary power supply voltage detection module 604 detects a first voltage value U1 of the first auxiliary power supply contact 6061 and sends U1 to the first control unit 602. After receiving U1, the first control unit 602 records the time T1 at which U1 is received and sends U1 and T1 to the main control module 601.

[0268] Please continue reading Figure 17 When A1+ and A1- of vehicle socket 1 are powered on, since A1+ and A1- of vehicle socket 1 are connected in parallel with A2+ and A2- of vehicle socket 2, A2+ and A2- of vehicle socket 2 are also powered on almost simultaneously. Therefore, an open-circuit voltage exists between A2+ and A2- of vehicle socket 2, and the value of this open-circuit voltage is approximately equal to the value of U1. Charging device 600 detects a second voltage signal from second auxiliary power supply contact 6071, where the second voltage signal includes a second voltage value and a second time value. The second voltage value is the voltage value of second auxiliary power supply contact 6071, and the second time value is the time when the charging device detects the second voltage value.

[0269] Specifically, the second auxiliary power supply voltage detection module 605 detects the second voltage value U2 of the second auxiliary power supply contact 6071 and sends U2 to the second control unit 603. After receiving U2, the second control unit 603 records the time T2 when U2 is received and sends U2 and T2 to the main control module 601.

[0270] The charging device 600 determines whether to enable the first DC power supply contact 6062 and the second DC power supply contact 6072 to simultaneously output current to charge the vehicle based on the first voltage signal and the second voltage signal.

[0271] In one possible implementation, after receiving U1 and T1 from the first control unit 602 and U2 and T2 from the second control unit 603, the main control module 601 determines whether the first charging interface 606 and the second charging interface 607 are connected to the same vehicle. Specifically, in response to the absolute value of the difference between U1 and U2 being within a first preset threshold, and the absolute value of the difference between T1 and T2 being within a second preset threshold, the charging device 600 causes the first DC power contact 6062 and the second DC power contact 6072 to simultaneously output current to charge the vehicle.

[0272] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1s, the main control module 601 determines that the first charging interface 606 and the second charging interface 607 are connected to the same vehicle.

[0273] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1.5s, the main control module 601 determines that the first charging interface 606 and the second charging interface 607 are connected to the same vehicle.

[0274] The main control module 601 marks the charging gun corresponding to the first charging interface 606 as gun #1, and marks the charging gun corresponding to the second charging interface 607 as gun #2.

[0275] In actual application, the charging device 600 also includes a power supply module, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact 6062 or the second DC power supply contact 6072 outputs current to charge the vehicle.

[0276] During the subsequent charging process, the first control unit 602 corresponding to the first charging interface 606 communicates with the vehicle's BMS to obtain the vehicle's charging requirement information and transmits this information to the main control module 601. The main control module 601 then allocates the output voltage and current of the first and second DC power contacts 6062 and 6072 based on the obtained charging requirement information. The main control module 601 transmits a charging signal to the power supply module. Upon receiving the signal, the power supply module outputs the corresponding charging voltage and current to the first and second DC power contacts 6062 and 6072, thereby enabling the charging device 600 to simultaneously charge the same vehicle.

[0277] Dual-gun charging process for Model 3:

[0278] Take the first charging interface 606 and the second charging interface 607 as an example of connecting to the vehicle socket, please refer to Figure 16 and Figure 18 , the dual-gun pairing process of charging device 600 for vehicle type 3 is described.

[0279] Figure 18 This is a schematic diagram of the connection interface between the charging port and the vehicle socket of model 3. Figure 18 As shown, S1+ and S2+ of the two vehicle sockets are connected, and S1- and S2- are connected; A1+ and A1- of vehicle socket 1 are connected to the BMS, which is the main vehicle socket; A2+ and A2- of vehicle socket 2 are not connected to the BMS and are in a suspended state, which is the auxiliary vehicle socket.

[0280] The first charging interface 606 is connected to vehicle socket 1, and the second charging interface 607 is connected to vehicle socket 2. The first control unit 602 detects whether the first charging interface 606 is successfully connected to vehicle socket 1, and the second control unit 603 detects whether the second charging interface 607 is successfully connected to vehicle socket 2. When the first control unit 602 detects that the voltage value of the first charging connection confirmation contact 6064 is 4V, it determines that the first charging interface 606 is successfully connected to vehicle socket 1. Similarly, when the second control unit 603 detects that the voltage value of the second charging connection confirmation contact 6074 is 4V, it determines that the second charging interface 607 is successfully connected to vehicle socket 2. The first control unit 602 and the second control unit 603 respectively send signals to the main control module 601 indicating that the first charging interface 606 and the second charging interface 607 are successfully connected to the vehicle socket.

[0281] After connecting the first charging port 606 and the second charging port 607 to vehicle socket 1 and vehicle socket 2, respectively, the user initiates charging. The auxiliary power supply within the charging device 600 supplies power to the vehicle's BMS via the first auxiliary power supply contact 6061. The charging device 600 detects a first voltage signal from the first auxiliary power supply contact 6061. The first voltage signal includes a first voltage value and a first time value. The first voltage value is the voltage value of the first auxiliary power supply contact 6061, and the first time value is the time when the charging device detects the first voltage value.

[0282] Specifically, the first auxiliary power supply voltage detection module 604 detects a first voltage value U1 of the first auxiliary power supply contact 6061 and sends U1 to the first control unit 602. After receiving U1, the first control unit 602 records the time T1 at which U1 is received and sends U1 and T1 to the main control module 601.

[0283] Please continue reading Figure 18 Because A2+ and A2- of vehicle socket 2 are floating and not connected to the BMS, the second auxiliary power voltage detection module 605 cannot detect the voltage between A2+ and A2- of vehicle socket 2. In other words, the second auxiliary power voltage detection module 605 cannot detect the second voltage of the second auxiliary power supply contact 6071.

[0284] The main control module 601 is unable to obtain the second voltage U2 of the second auxiliary power supply contact 6071 and, therefore, cannot determine whether the two guns are successfully paired by comparing the values ​​of U1 and U2. Specifically, after receiving U1 and T1 from the first control unit 602, if the main control module 601 does not receive U2 and T2 from the second control unit 603 within a preset time, the main control module 601 determines that a timeout has occurred.

[0285] In a possible implementation, after the main control module 601 receives U1 and T1 sent by the first control unit 602 , if it does not receive U2 and T2 sent by the second control unit 603 within 10 seconds, the main control module 601 determines that a timeout has occurred.

[0286] In response to the main control module 601 obtaining the first voltage signal, the charging device 600 obtains the first communication signal of the first communication contact 6063 and the second communication signal of the second communication contact 6073, and determines whether to make the first charging interface 606 and the second charging interface 607 output current simultaneously to charge the vehicle based on the first communication signal and the second communication signal.

[0287] The first communication signal includes first charging information, which includes a first vehicle handshake message and a first vehicle identification message; the second communication signal includes second charging information, which includes a second vehicle handshake message and a second vehicle identification message.

[0288] Specifically, the first control unit 602 establishes a communication connection with the vehicle's BMS via the first communication contact 6063, enabling communication with the vehicle's BMS. The first control unit 602 transmits the CHM and CRM to the BMS. After receiving the CHM and CRM, the BMS transmits the vehicle's BHM and BRM to the first control unit 602 via the first communication contact 6063. The first control unit 602 transmits the received BHM and BRM to the main control module 601. Furthermore, because the S2+ and S2- terminals of vehicle socket 2 are connected in parallel with the S1+ and S1- terminals of vehicle socket 1, the vehicle's BHM and BRM transmitted by the BMS can be transmitted to the second control unit 603 via the communication cable between the BMS and the second control unit. In other words, the second control unit 603 can obtain the vehicle's BHM and BRM via the second communication contact 6073. After obtaining the vehicle's BHM and BRM, the second control unit 603 transmits them to the main control module 601. After the main control module 601 receives the BHM and BRM sent by the first control unit 602 and the second control unit 603, it determines whether to enable the first DC power supply contact 6062 and the second DC power supply contact 6072 to simultaneously output current to charge the vehicle based on the BHM and BRM sent by the first control unit 602 and the BHM and BRM sent by the second control unit 603.

[0289] The BHM contains the allowable charging voltage information of the BMS, and the BRM contains the vehicle's battery type, battery rated capacity, battery rated voltage and vehicle identification number (VIN) information.

[0290] In one possible implementation, the main control module 601 determines whether the first charging interface 606 and the second charging interface 607 are connected to the same vehicle based on the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM sent by the first control unit 602 are the same as the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM sent by the second control unit 603, the main control module 601 determines that the first charging interface 606 and the second charging interface 607 are connected to the same vehicle.

[0291] In one possible implementation, the main control module 601 determines whether the first charging interface 606 and the second charging interface 607 are connected to the same vehicle based on the vehicle identification code (VIN). Specifically, if the VIN included in the BHM and BRM sent by the first control unit 602 is the same as the VIN included in the BHM and BRM sent by the second control unit 603, the main control module 601 determines that the first charging interface 606 and the second charging interface 607 are connected to the same vehicle.

[0292] The main control module 601 marks the charging gun corresponding to the first charging interface 606 as gun #1, and marks the charging gun corresponding to the second charging interface 607 as gun #2.

[0293] In actual application, the charging device 600 also includes a power supply module, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact 6062 or the second DC power supply contact 6072 outputs current to charge the vehicle.

[0294] During the subsequent charging process, the first control unit 602 corresponding to the first charging interface 606 communicates with the vehicle's BMS to obtain the vehicle's charging requirement information and transmits this information to the main control module 601. The main control module 601 then allocates the output voltage and current of the first and second DC power contacts 6062 and 6072 based on the obtained charging requirement information. The main control module 601 transmits a charging signal to the power supply module. Upon receiving the signal, the power supply module outputs the corresponding charging voltage and current to the first and second DC power contacts 6062 and 6072, thereby enabling the charging device 600 to simultaneously charge the same vehicle.

[0295] like Figure 19 As shown, the embodiment of the present application also provides a method for charging an electric vehicle using a charging device, which is applicable to the above-mentioned charging device. The structure of the charging device can be referred to the description in the above-mentioned embodiment and will not be repeated here.

[0296] Taking the connection of the first charging interface to the vehicle socket 1 (main vehicle socket) and the connection of the second charging interface to the vehicle socket 2 (auxiliary vehicle socket) as an example, the method of pairing the charging device or charging station with the dual guns is described in detail.

[0297] Step 191: Charging connection is completed, charging is started, and step 192 is executed.

[0298] The first charging port is connected to vehicle socket 1, and the second charging port is connected to vehicle socket 2. The first control unit detects whether the first charging port is successfully connected to vehicle socket 1, and the second control unit detects whether the second charging gun is successfully connected to vehicle socket 2. When the first control unit detects that the voltage of the first charging connection confirmation contact is 4V, it determines that the first charging gun is successfully connected to vehicle socket 1. Similarly, when the second control unit detects that the voltage of the second charging connection confirmation contact is 4V, it determines that the second charging port is successfully connected to vehicle socket 2. The first control unit and the second control unit respectively send signals to the main control module indicating that the first and second charging ports are successfully connected to the vehicle sockets.

[0299] After the user starts charging, the auxiliary power supply circuit between the auxiliary power supply and the vehicle socket 1 is connected, and the auxiliary power supply supplies power to the vehicle's BMS through the first auxiliary power supply contact.

[0300] Step 192 : Detect a first voltage signal of the first auxiliary power supply contact and a second voltage signal of the second auxiliary power supply contact, and execute step 193 .

[0301] The first voltage signal includes a first voltage value and a first time value; the first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device obtains the first voltage value. The second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value.

[0302] The first auxiliary power supply voltage detection module detects the first voltage value U1 of the first auxiliary power supply contact and sends U1 to the first control unit. After receiving U1, the first control unit records the time T1 of receiving U1 and sends U1 and T1 to the main control module.

[0303] Similarly, the second auxiliary power supply voltage detection module detects the second voltage value U2 of the second auxiliary power supply contact and sends U2 to the second control unit. After receiving U2, the second control unit records the time T2 of receiving U2 and sends U2 and T2 to the main control module.

[0304] Step 193 : Check whether the main control module has received the first voltage signal and the second voltage signal. If so, execute step 194 ; otherwise, execute step 197 .

[0305] For vehicle models 1 and 2, when power is applied to A1+ and A1- on vehicle socket 1, A2+ and A2- on vehicle socket 2 are also applied almost simultaneously, as they are connected in parallel. Consequently, an open-circuit voltage exists between A2+ and A2- on vehicle socket 2, and the value of this open-circuit voltage is approximately equal to the value of U1. The charging device detection module detects a second voltage signal from the second auxiliary power supply contact, where the second voltage signal includes a second voltage value and a second time value. The second voltage value represents the voltage of the second auxiliary power supply contact, and the second time value represents the time at which the charging device acquires the second voltage value.

[0306] Specifically, the second auxiliary power supply voltage detection module detects a second voltage value U2 of the second auxiliary power supply contact and sends U2 to the second control unit. After receiving U2, the second control unit records the time T2 of receiving U2 and sends U2 and T2 to the main control module.

[0307] Therefore, for vehicle type 1 and vehicle type 2, the main control module can receive the first voltage signal and the second voltage signal.

[0308] For vehicle models 3 and 4, there is no open-circuit voltage between A2+ and A2- on vehicle socket 2, and the second auxiliary power supply voltage detection module cannot detect the second voltage U2 of the second auxiliary power supply contact. Therefore, the main control module can only receive the first voltage signal.

[0309] Specifically, after the main control module receives the first voltage signal, if it does not receive the second voltage signal within a preset time, the main control module determines that a timeout has occurred and executes step 197 .

[0310] In a possible implementation, after the main control module receives U1 and T1 sent by the first control unit, if it does not receive U2 and T2 sent by the second control unit within 10 seconds, the main control module determines that a timeout has occurred and executes step 197 .

[0311] Step 194: Determine whether the absolute value of the difference between the first voltage value and the second voltage value is within a first preset threshold, and whether the absolute value of the difference between the first time value and the second time value is within a second preset threshold; if so, execute step 195; otherwise, execute step 196.

[0312] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1s, the main control module determines that the first charging port and the second charging port are connected to the same vehicle.

[0313] In one possible implementation, in response to |U2-U1|≤2V and |T2-T1|≤1.5s, the main control module determines that the first charging port and the second charging port are connected to the same vehicle.

[0314] Step 195: The first DC power supply contact and the second DC power supply contact simultaneously output current to charge the vehicle.

[0315] The main control module marks the charging gun corresponding to the first charging interface as 1# gun, and marks the charging gun corresponding to the second charging interface as 2# gun.

[0316] In actual application, the charging device also includes a power supply module, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0317] During the subsequent charging process, the first control unit corresponding to the first charging interface communicates with the vehicle's BMS to obtain the vehicle's charging requirements and transmits this information to the main control module. The main control module then allocates the output voltage and current of the first and second DC power contacts based on this information. The main control module then transmits a charging signal to the power supply module. Upon receiving the signal, the power supply module outputs the corresponding charging voltage and current to the first and second DC power contacts, enabling the charging equipment to simultaneously charge the same vehicle.

[0318] Step 196: The first DC power supply contact and the second DC power supply contact do not output current at the same time to charge the vehicle.

[0319] For the above-mentioned models 1 and 2, if the absolute value of the difference between U1 and U2 is not within the first preset threshold, or the absolute value of the difference between T1 and T2 is not within the second preset threshold, or the absolute value of the difference between U1 and U2 is not within the first preset threshold and the absolute value of the difference between T1 and T2 is not within the second preset threshold, the main control module determines that the first charging interface and the second charging interface are not connected to the same electric vehicle, and the first charging interface and the second charging interface charge the vehicles connected to them respectively.

[0320] Step 197 : Acquire the first communication signal of the first communication contact and the second communication signal of the second communication contact, and execute step 198 .

[0321] The first communication signal includes first charging information, which includes a first vehicle handshake message and a first vehicle identification message; the second communication signal includes second charging information, which includes a second vehicle handshake message and a second vehicle identification message.

[0322] Specifically, the first control unit establishes a communication connection with the vehicle's BMS via a first communication contact, enabling communication with the vehicle's BMS. The first control unit transmits the CHM and CRM to the BMS. After receiving the CHM and CRM, the BMS transmits the vehicle's BHM and BRM to the first control unit via the first communication contact. The first control unit then transmits the received BHM and BRM to the main control module.

[0323] Because the S2+ and S2- terminals of vehicle socket 2 in vehicle model 3 are connected in parallel with the S1+ and S1- terminals of vehicle socket 1, the vehicle's BHM and BRM values ​​sent by the BMS can be transmitted to the second control unit via the communication cable between the BMS and the second control unit. In other words, the second control unit can obtain the vehicle's BHM and BRM values ​​via the second communication contacts. After obtaining the vehicle's BHM and BRM values, the second control unit sends them to the main control module.

[0324] Step 198 : Check whether the main control module has received the first communication signal and the second communication signal. If so, execute step 199 ; otherwise, execute step 203 .

[0325] For vehicle type 3, the main control module can obtain the first communication signal of the first communication contact and the second communication signal of the second communication contact.

[0326] In vehicle model 4, because S2+ and S2- on vehicle socket 2 are left unconnected to the BMS, the second control unit cannot obtain the vehicle's BHM and BRM signals. The main control module can only obtain the first communication signal from the first communication contact.

[0327] In a possible implementation, after the main control module receives the BHM and BRM sent by the first control unit, if it does not receive the BHM and BRM sent by the second control unit within 10 seconds, the main control module determines that a timeout has occurred and executes step 202 .

[0328] Step 199: Determine whether the first communication signal and the second communication signal are information about the same vehicle. If so, execute step 200; otherwise, execute step 201.

[0329] The BHM contains the allowable charging voltage information of the BMS, and the BRM contains the vehicle's battery type, battery rated capacity, battery rated voltage and vehicle identification number (VIN) information.

[0330] In one possible implementation, the main control module determines whether the first charging interface and the second charging interface are connected to the same vehicle based on the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM sent by the first control unit are the same as the allowable charging voltage, the vehicle's battery type, the battery rated capacity, and the battery rated voltage information contained in the BHM and BRM sent by the second control unit, the main control module determines that the first charging interface and the second charging interface are connected to the same vehicle.

[0331] In one possible implementation, the main control module determines whether the first charging interface and the second charging interface are connected to the same vehicle based on the vehicle identification code (VIN). Specifically, if the VIN included in the BHM and BRM sent by the first control unit is the same as the VIN included in the BHM and BRM sent by the second control unit, the main control module determines that the first charging interface and the second charging interface are connected to the same vehicle.

[0332] Step 200: The first DC power supply contact and the second DC power supply contact simultaneously output current to charge the vehicle.

[0333] The main control module marks the charging gun corresponding to the first charging interface as 1# gun, and marks the charging gun corresponding to the second charging interface as 2# gun.

[0334] In actual application, the charging device also includes a power supply module, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0335] During the subsequent charging process, the first control unit corresponding to the first charging interface communicates with the vehicle's BMS to obtain the vehicle's charging requirements and transmits this information to the main control module. The main control module then allocates the output voltage and current of the first and second DC power contacts based on this information. The main control module then transmits a charging signal to the power supply module. Upon receiving the signal, the power supply module outputs the corresponding charging voltage and current to the first and second DC power contacts, enabling the charging equipment to simultaneously charge the same vehicle.

[0336] Step 201: The first DC power supply contact and the second DC power supply contact do not output current at the same time to charge the vehicle.

[0337] If the main control module determines that the first charging interface and the second charging interface are not connected to the same vehicle, the charging device enables the first charging interface and the second charging interface to charge the vehicles connected to them respectively.

[0338] Step 202: Manual pairing, proceed to step 203.

[0339] For vehicle model 4, the main control module only obtains the first communication signal of the first communication contact and determines that it is impossible to enable the first DC charging interface and the second DC charging interface to simultaneously output current to charge the vehicle based on the first communication signal and the second communication signal.

[0340] The charging app, charging applet, or the human-computer interaction interface on the charging terminal displays information requiring manual pairing by the user.

[0341] In specific implementation, the user can know whether the first charging gun (the charging gun connected to the first charging interface) is already charging the vehicle through the charging APP, the charging applet, or the human-computer interaction interface on the charging terminal.

[0342] If the user chooses single-charger charging, the user does not need to unplug the first charging gun. The first charging gun plugged into the vehicle socket 1 can output current to charge the vehicle.

[0343] If the user chooses manual pairing and the first charging gun is already outputting current to charge the vehicle, the user can choose to stop charging through the charging app, charging applet, or the human-computer interaction interface on the charging terminal to stop the first charging gun from outputting current to charge the vehicle.

[0344] When the user learns through the charging app, charging applet, or the human-computer interaction interface on the charging terminal that the first and second charging guns have no output current, they unplug the two guns and perform manual pairing.

[0345] In a specific implementation, the first charging gun also includes a first electronic locking device, and the second charging gun also includes a second electronic locking device. When the charging gun is plugged into the vehicle, the electronic locking device can lock the charging gun to ensure a secure connection between the charging gun and the vehicle socket, preventing the charging gun from being loosely connected to the vehicle socket, causing displacement or detachment, thereby ensuring the safety of the charging process.

[0346] When neither the first charging gun nor the second charging gun outputs current to charge the vehicle, the first control unit and the second control unit respectively send unlocking permission signals to the first electronic locking device and the second electronic locking device, thereby unlocking the first charging gun and the second charging gun, so that the user can unplug the charging gun from the vehicle socket.

[0347] Step 203: The user unplugs the two charging guns and presses the buttons of the two charging guns simultaneously for X seconds or Y times, and then executes step 204.

[0348] For the convenience of explanation, the charging control steering circuit corresponding to the first charging gun is defined as a first charging control steering circuit, and the charging control steering circuit corresponding to the second charging gun is defined as a second charging control steering circuit.

[0349] In a possible implementation, when the user simultaneously presses the buttons of the first charging gun and the second charging gun for X seconds and then releases them, the voltage at detection point 1 of the first charging control steering circuit (the voltage at CC1-1) and the voltage at detection point 1 of the second charging control steering circuit (the voltage at CC1-2) will both change from 6V to 12V to 6V. Figure 10 , Figure 10 (a) is a schematic diagram of the voltage change of CC1-1; Figure 10 (b) is a schematic diagram of the voltage changes at CC1-2. The first control unit detects the voltage at CC1-1 and sends the detection result to the main control module. Similarly, the second control unit detects the voltage at CC1-2 and sends the detection result to the main control module. It should be noted that when a user simultaneously presses the buttons of the first and second charging guns for X seconds and then releases them, the X seconds of pressing the buttons are not limited and can be 5 seconds, 10 seconds, etc.

[0350] In another possible implementation, the user presses the buttons of the first charging gun and the second charging gun Y times simultaneously to pair the first charging gun and the second charging gun. For the sake of convenience, the pairing principle is explained by taking the case where the user presses the buttons of the first charging gun and the second charging gun twice simultaneously as an example. Figure 11 When the user simultaneously presses the buttons of the first and second charging guns twice, the first control unit sends the detected voltage change signal of CC1-1 to the main control module, and the second control unit sends the detected voltage change signal of CC1-2 to the main control module. It should be noted that the user pressing the buttons of the first and second charging guns 26 and 27 twice is only an example; in actual applications, there is no limit to the number of button presses.

[0351] Step 204: The main control module determines whether the absolute value of the rising edge time difference and the absolute value of the falling edge time difference of the CC1-1 voltage change signal and the CC1-2 voltage change signal are both within the preset threshold; if so, execute step 205; otherwise, execute step 206.

[0352] Refer to the above Figure 10 and Figure 11 As shown, in one possible implementation, the main control module determines whether the absolute value of the rising edge time difference and the absolute value of the falling edge time difference of the CC1-1 voltage change signal and the CC1-2 voltage change signal are both less than or equal to 1 second; if so, execute step 205; otherwise, execute step 206.

[0353] Step 205: The first DC power supply contact and the second DC power supply contact simultaneously output current to charge the vehicle.

[0354] If the absolute value of the time difference between the rising edges and the absolute value of the time difference between the falling edges of the two sets of signals are within the preset threshold, the main control module determines that the first charging interface and the second charging interface are plugged into the same vehicle, and the main control module marks the charging gun corresponding to the first charging interface as 1# gun, and marks the charging gun corresponding to the second charging interface as 2# gun (auxiliary gun).

[0355] In actual application, the charging device also includes a power supply module, which is used to convert the AC power output from the grid side into DC power, so that the first DC power supply contact or the second DC power supply contact outputs current to charge the vehicle.

[0356] During the subsequent charging process, the first control unit corresponding to the first charging interface communicates with the vehicle's BMS to obtain the vehicle's charging requirements and transmits this information to the main control module. The main control module then allocates the output voltage and current of the first and second DC power contacts based on this information. The main control module then transmits a charging signal to the power supply module. Upon receiving the signal, the power supply module outputs the corresponding charging voltage and current to the first and second DC power contacts, enabling the charging equipment to simultaneously charge the same vehicle.

[0357] Step 206: The first DC power supply contact and the second DC power supply contact do not output current at the same time to charge the vehicle.

[0358] If the absolute value of the time difference between the rising edges of the two sets of signals, or the absolute value of the time difference between the falling edges is not within the preset threshold, or the absolute value of the time difference between the rising edges and the absolute value of the time difference between the falling edges are both not within the preset threshold, the main control module determines that the first charging interface and the second charging interface are not connected to the same vehicle, and the charging device causes the first charging interface and the second charging interface to charge their respective connected vehicles respectively.

[0359] The present application also provides a method for charging an electric vehicle using a charging device. The method includes multiple states, each of which is used to manage a charging action during the charging process of the charging device. Each state is configured with conditions for entering and exiting the state. The charging device is also equipped with a charging device controller for storing and managing these states.

[0360] For the convenience of description, the contacts of the first charging interface are defined as: first auxiliary power supply contacts (A+, A-), first DC power supply contacts (DC+, DC-), first communication contacts (S+, S-), and first charging connection confirmation contacts (CC1); the contacts of the second charging interface are defined as: second auxiliary power supply contacts (A+, A-), second DC power supply contacts (DC+, DC-), second communication contacts (S+, S-), and second charging connection confirmation contacts (CC1).

[0361] As shown in Figure 20(a), after the first and second charging interfaces are physically connected to the vehicle, the charging device enters the dual charging interface connection state. When the charging device controller detects that the voltages of both the first and second charging connection confirmation contacts are 4V, the charging device enters the auxiliary power supply power-on state.

[0362] As shown in Figure 20(b), after the charging device enters the auxiliary power supply state, the auxiliary power supply circuit in the charging device is connected, and the auxiliary power supply output current supplies power to the vehicle's BMS. The charging device controller detects a first voltage signal from the first auxiliary power supply contact and a second voltage signal from the second auxiliary power supply contact.

[0363] The first voltage signal includes a first voltage value and a first time value; the first voltage value is the voltage value of the first auxiliary power supply contact; the first time value is the time when the charging device obtains the first voltage value;

[0364] The second voltage signal includes a second voltage value and a second time value; the second voltage value is the voltage value of the second auxiliary power supply contact; and the second time value is the time when the charging device obtains the second voltage value.

[0365] If the charging device controller obtains the first voltage signal or the second voltage signal, the charging device enters the dual charging handshake identification state;

[0366] If the charging device controller obtains the first voltage signal and the second voltage signal, it determines whether the first voltage signal and the second voltage signal meet the preset conditions; if the preset conditions are met, it enters the dual charging interface power supply state, otherwise, it enters the single charging interface power supply state.

[0367] In one possible embodiment, in response to the absolute value of the difference between the first voltage value and the second voltage value being less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value being less than or equal to 1 second, the charging device controller determines that the first charging interface and the second charging interface are connected to the same vehicle, and the charging device enters a dual charging interface power supply state, and the first charging interface and the second charging interface simultaneously output current to charge the vehicle.

[0368] In one possible embodiment, in response to the absolute value of the difference between the first voltage value and the second voltage value being less than or equal to 2V, and the absolute value of the difference between the first time value and the second time value being less than or equal to 1.5 seconds, the charging device controller determines that the first charging interface and the second charging interface are connected to the same vehicle, and the charging device enters a dual charging interface power supply state, and the first charging interface and the second charging interface simultaneously output current to charge the vehicle.

[0369] The charging device marks the charging gun corresponding to the first charging interface as 1# gun, and marks the charging gun corresponding to the second charging interface as 2# gun.

[0370] During the subsequent charging process, the first control unit corresponding to the first charging interface communicates with the vehicle's BMS to obtain the vehicle's charging requirement information and sends the obtained charging requirement information to the charging device. The charging device then allocates the output voltage and output current of the first and second DC power contacts based on the obtained charging requirement information.

[0371] If the first voltage signal and the second voltage signal do not meet the preset conditions, the charging device enters the single-port power supply state. In other words, the charging device determines that the first charging port and the second charging port are not connected to the same vehicle, and the two charging ports charge their respective connected vehicles according to the single-charger charging process.

[0372] As shown in FIG20( c ), after the charging device controller obtains the first voltage signal or the second voltage signal, it enters the dual charging handshake identification state, and the charging device and the vehicle perform handshake communication.

[0373] The charging device controller obtains the first communication signal of the first communication contact and the second communication signal of the second communication contact, and determines whether the first communication signal and the second communication signal meet the preset conditions. If so, the charging device enters the dual charging interface power supply state; otherwise, it enters the single charging interface power supply state.

[0374] It should be noted that the first communication signal includes first charging information, which includes a first vehicle handshake message and a first vehicle identification message; the second communication signal includes second charging information, which includes a second vehicle handshake message and a second vehicle identification message. The BHM contains the BMS's allowable charging voltage information, and the BRM contains the vehicle's battery type, rated capacity, rated voltage, and vehicle identification number (VIN).

[0375] In one possible implementation, the charging device controller determines whether the first and second charging interfaces are connected to the same vehicle based on the allowable charging voltage, vehicle battery type, battery rated capacity, and battery rated voltage information contained in the BHM and BRM. Specifically, if the allowable charging voltage, vehicle battery type, battery rated capacity, and battery rated voltage information contained in the first charging information are the same as the allowable charging voltage, vehicle battery type, battery rated capacity, and battery rated voltage information contained in the second charging information, the charging device controller determines that the first and second charging interfaces are connected to the same vehicle, and the charging device enters a dual-charging interface power supply state, with the first and second charging interfaces simultaneously outputting current to charge the vehicle.

[0376] In one possible implementation, the charging device controller determines whether the first and second charging interfaces are connected to the same vehicle based on the vehicle identification code (VIN). Specifically, if the VIN included in the first charging information is the same as the VIN included in the second charging information, the charging device controller determines that the first and second charging interfaces are connected to the same vehicle. The charging device then enters a dual-interface power supply state, with the first and second charging interfaces simultaneously outputting current to charge the vehicle.

[0377] If the first communication signal and the second communication signal do not meet the preset conditions, the charging device enters the single-port power supply state. In other words, the charging device determines that the first charging port and the second charging port are not connected to the same vehicle, and the two charging ports charge their respective connected vehicles according to the single-charger charging process.

[0378] In summary, the method for charging an electric vehicle using a charging device provided in this application includes multiple states, such as dual charging interface connection state, auxiliary power supply power-on state, dual charging handshake identification state, dual charging interface power supply state, etc.

[0379] When the charging device controller detects that the voltage values ​​of the first charging connection confirmation contact and the second charging connection confirmation contact are both 4V, the charging device exits the dual charging connection state and enters the auxiliary power supply power-on state;

[0380] When the charging device controller obtains the first voltage signal or the second voltage signal, the charging device exits the auxiliary power supply power-on state and enters the dual charging handshake identification state;

[0381] When the charging device controller obtains the first voltage signal and the second voltage signal and determines that the first voltage signal and the second voltage signal meet the preset conditions, the charging device exits the auxiliary power supply state and enters the dual charging port power supply state;

[0382] When the charging device controller obtains the first communication signal and the second communication signal and determines that the first communication signal and the second communication signal meet the preset conditions, the charging device exits the dual charging handshake identification state and enters the dual charging interface power supply state.

[0383] It should be noted that for the aforementioned various method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that this application is not limited to the order of the actions described. According to this application, certain steps can be performed in other orders or simultaneously, and the steps in the method of the embodiment of this application can be adjusted in order, combined, and deleted according to actual needs.

[0384] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A charging device for charging an electric vehicle, characterized in that: The charging device includes: a first charging interface, a second charging interface, a first auxiliary power supply voltage detection module, a second auxiliary power supply voltage detection module and a charging device controller; The first charging interface includes: a first auxiliary power supply contact and a first DC power supply contact, wherein the first auxiliary power supply contact is used to supply power to the controller of the electric vehicle; The second charging interface includes: a second auxiliary power supply contact and a second DC power supply contact; The first auxiliary power supply voltage detection module is used to detect the voltage value of the first auxiliary power supply contact; The second auxiliary power supply voltage detection module is used to detect the voltage value of the second auxiliary power supply contact; The charging device controller is used to obtain a first voltage signal and a second voltage signal, wherein the first voltage signal includes a first voltage value and a first time value, the first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device obtains the first voltage value, and the second voltage signal includes a second voltage value and a second time value, the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value; In response to the charging device controller acquiring the first voltage signal and the second voltage signal; The charging device is used for: determining that an absolute value of a difference between the first voltage value and the second voltage value is within a first preset threshold, and an absolute value of a difference between the first time value and the second time value is within a second preset threshold; The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle.

2. The charging device according to claim 1, characterized in that The first charging interface further includes a first communication contact, and the second charging interface further includes a second communication contact; In response to the charging device controller acquiring the first voltage signal or the second voltage signal, the charging device is configured to: Obtaining a first communication signal from the first communication contact, wherein the first communication signal includes first charging information of the electric vehicle, and the first charging information includes a first vehicle handshake message, a first vehicle identification message, and a first vehicle identification code; Obtaining a second communication signal from the second communication contact, wherein the second communication signal includes second charging information of the electric vehicle, and the second charging information includes a second vehicle handshake message, a second vehicle identification message, and a second vehicle identification code; The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle according to the first charging information and the second charging information.

3. The charging device according to claim 2, characterized in that: The vehicle handshake message includes information on the vehicle battery's allowable charging voltage; the vehicle identification message includes information on the vehicle's battery type, battery rated capacity, and battery rated voltage; In response to the first charging information and the second charging information being the same, the charging device is configured to enable the first DC power supply contact and the second DC power supply contact to charge the electric vehicle.

4. A method for charging an electric vehicle using a charging device, characterized in that: The charging device includes: a first charging interface, a second charging interface and a charging device controller; The first charging interface includes: a first auxiliary power supply contact and a first DC power supply contact, wherein the first auxiliary power supply contact is used to supply power to the controller of the electric vehicle; The second charging interface includes: a second auxiliary power supply contact and a second DC power supply contact; The method comprises: Detecting a first voltage signal of the first auxiliary power supply contact and a second voltage signal of the second auxiliary power supply contact, wherein the first voltage signal includes a first voltage value and a first time value, the first voltage value is the voltage value of the first auxiliary power supply contact, and the first time value is the time when the charging device obtains the first voltage value, and the second voltage signal includes a second voltage value and a second time value, the second voltage value is the voltage value of the second auxiliary power supply contact, and the second time value is the time when the charging device obtains the second voltage value; In response to the charging device controller acquiring the first voltage signal and the second voltage signal; The method further comprises: determining that an absolute value of a difference between the first voltage value and the second voltage value is within a first preset threshold, and an absolute value of a difference between the first time value and the second time value is within a second preset threshold; The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle.

5. The method according to claim 4, characterized in that The first charging interface further includes a first communication contact, and the second charging interface further includes a second communication contact; in response to the charging device controller acquiring the first voltage signal or the second voltage signal; The method further comprises: Obtaining a first communication signal from the first communication contact, wherein the first communication signal includes first charging information of the electric vehicle, and the first charging information includes a first vehicle handshake message, a first vehicle identification message, and a first vehicle identification code; Obtaining a second communication signal from the second communication contact, wherein the second communication signal includes second charging information of the electric vehicle, and the second charging information includes a second vehicle handshake message, a second vehicle identification message, and a second vehicle identification code; The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle according to the first charging information and the second charging information.

6. The method according to claim 5, characterized in that The vehicle handshake message includes information on the vehicle battery's allowable charging voltage; the vehicle identification message includes information on the vehicle's battery type, battery rated capacity, and battery rated voltage; The method of enabling the first DC power supply contact and the second DC power supply contact to charge the electric vehicle according to the first charging information and the second charging information includes: determining that the first charging information and the second charging information are the same; The first DC power supply contact and the second DC power supply contact are used to charge the electric vehicle.

7. A method for charging an electric vehicle using a charging device, characterized in that: The method comprises: The storage state machine includes a plurality of states; wherein each of the plurality of states is used to manage a charging action during the charging process of the charging device; The multiple states include a dual charging interface connection state and a dual charging interface power supply state; the dual charging interface connection state is used to indicate that the first charging interface and the second charging interface are physically connected to the electric vehicle; the dual charging interface power supply state is used to indicate that the first DC power supply contact and the second DC power supply contact are charging the electric vehicle; configuring a charging device controller to control the charging device to charge the electric vehicle according to the state machine; The multiple states further include an auxiliary power supply power-on state, wherein the auxiliary power supply power-on state is used to indicate that the auxiliary power supply of the charging device supplies power to the controller of the electric vehicle; The condition for entering the auxiliary power supply power-on state is: the charging device controller detects that the voltage value of the charging connection confirmation contact of the first charging interface and the voltage value of the charging connection confirmation contact of the second charging interface are both 4V; The exit condition of the auxiliary power supply power-on state is: the charging device controller obtains a first voltage signal of the auxiliary power supply contact of the first charging interface or a second voltage signal of the auxiliary power supply contact of the second charging interface; or the charging device controller obtains the first voltage signal and the second voltage signal and determines that the first voltage signal and the second voltage signal meet a preset condition; The first voltage signal includes a first voltage value and a first time value; wherein the first voltage value is the voltage value of the auxiliary power supply contact of the first charging interface; and the first time value is the time when the charging device obtains the first voltage value. The second voltage signal includes a second voltage value and a second time value; wherein the second voltage value is the voltage value of the auxiliary power supply contact of the second charging interface; and the second time value is the time when the charging device obtains the second voltage value; It is determined that the absolute value of the difference between the first voltage value and the second voltage value is within a first preset threshold, and the absolute value of the difference between the first time value and the second time value is within a second preset threshold, and the charging device exits the auxiliary power supply power-on state and enters the dual charging interface power supply state.

8. The method according to claim 7, characterized in that The state machine is configured to provide entry and exit conditions for at least one state of the plurality of states.

9. The method according to claim 7 or 8, characterized in that The multiple states further include a double handshake identification state, wherein the double handshake identification state is used to indicate that the charging device is communicating with the electric vehicle; The condition for entering the double handshake identification state is: the charging device controller obtains the first voltage signal or the second voltage signal; The exit condition of the double handshake identification state is: the charging device controller obtains the first communication signal and the second communication signal, and determines that the first communication signal and the second communication signal meet the preset conditions; Among them, the first communication signal includes first charging information; the first charging information includes a first vehicle handshake message, a first vehicle identification message and a first vehicle identification code; the second communication signal includes second charging information; the second charging information includes a second vehicle handshake message, a second vehicle identification message and a second vehicle identification code.

10. The method according to claim 9, characterized in that The vehicle handshake message includes information on the vehicle battery's allowable charging voltage; the vehicle identification message includes information on the vehicle's battery type, battery rated capacity, and battery rated voltage; It is determined that the first charging information and the second charging information are the same, and the charging device exits the dual handshake identification state and enters the dual charging interface power supply state.

11. The method according to claim 7 or 8, characterized in that The exit condition of the dual charging interface connection state is: the charging device controller detects that the voltage value of the charging connection confirmation contact of the first charging interface and the voltage value of the charging connection confirmation contact of the second charging interface are both 4V.

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