Charging control method, system and controller of direct current charger

Abstract

The invention provides a charging control method and system of a direct current charger and a controller, and relates to the technical field of direct current chargers. The method comprises the following steps: acquiring configuration information of a charging gun through an equipment controller, wherein the configuration information at least comprises function information of the charging gun; in response to successful connection between the charging gun and the electric vehicle, working state indication information is sent to the equipment controller, and the working state indication information indicates that the charging gun is connected; according to a charging starting command sent by the equipment controller in response to a charging request initiated by a user, sending a power module association request to the equipment controller, so that the equipment controller applies for power resources from a power management module; and in response to successful application of the power resource by the equipment controller, entering a charging process according to the function information of the charging gun, and controlling the direct-current charger to supply power to the electric vehicle through the equipment controller and the vehicle controller. According to the invention, multiple charging guns can be led out from one direct current charger, and the construction cost of the direct current charger is reduced.

Description

Technical Field

[0001] This application relates to the field of DC charger technology, and more specifically, to a charging control method, system and controller for a DC charger. Background Technology

[0002] Existing integrated DC power supply equipment typically includes a DC charging pile and a charging gun. The DC charging pile includes a power conversion unit and a device controller. However, because this method does not make high utilization of the power module, separate power supply equipment has emerged in the industry.

[0003] The split power supply equipment divides the DC charging pile into two parts: the charging pile (or charger) and the terminal (charging pile). The charging pile is located at the far end of the vehicle, and the terminal is located at the near end of the vehicle. The charging pile provides a charging gun to connect with the vehicle. After the initial connection handshake is completed, the charging pile charges the electric vehicle.

[0004] While this solution improves the utilization rate of power modules compared to integrated DC power supply equipment, the split power supply equipment requires the construction of both charging piles and charging stations. Although it reduces the cost of power modules compared to integrated equipment, it increases the construction cost of the charging piles. In addition, both the charging piles and the terminal side require the installation of electrical connection devices such as surge protection, contactors, circuit breakers, and copper busbars, which increases the bill of materials cost of the split power supply equipment. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a charging control method, system, and controller for a DC charger, so that one DC charger can lead out multiple charging guns, thereby reducing the construction cost of DC chargers.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, embodiments of this application provide a charging control method for a DC charger, applied to a charging protocol controller in a charging gun. The charging protocol controller is connected to a vehicle controller in an electric vehicle, and is also communicatively connected to a device controller in the DC charger. The device controller is connected to a power management module in the DC charger. The method includes: The device controller obtains the configuration information of the charging gun, which includes at least the functional information of the charging gun. In response to the successful connection between the charging gun and the electric vehicle, a working status indication message is sent to the device controller, the working status indication message indicating that the charging gun has been connected; Based on the charging start command sent by the device controller in response to the user's charging request, a power module association request is sent to the device controller, so that the device controller can request power resources from the power management module; In response to the device controller's successful request for the power resources, the charging process begins based on the charging gun's functional information, and the DC charger is controlled by the device controller and the vehicle controller to supply power to the electric vehicle.

[0007] Secondly, embodiments of this application also provide a DC charging system, the DC charging system comprising: a DC charger, multiple charging guns, and multiple electric vehicles; The DC charger is connected to the multiple charging guns via multiple charging cables, and the charging plug of each charging gun is connected to the charging socket of each electric vehicle. The device controller in the DC charger is communicatively connected to the charging protocol controller in each charging gun, and the charging protocol controller in each charging gun is connected to the vehicle controller in each electric vehicle. The device controller is connected to the control terminal of the contactor switch on multiple charging cables in the DC charger; The charging protocol controller is used to execute the charging control method for the DC charger as described in any of the first aspects.

[0008] Thirdly, embodiments of this application also provide a charging protocol controller, including: a processor, a storage medium and a bus, wherein the storage medium stores program instructions executable by the processor, and when the charging protocol controller is running, the processor communicates with the storage medium via the bus, and the processor executes the program instructions to perform the steps of the charging control method of the DC charger as described in any of the first aspects.

[0009] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the charging control method for a DC charger as described in any of the first aspects.

[0010] The beneficial effects of this application are: The charging control method, system, and controller for the DC charger provided in this application interact with the device controller in the DC charger through a charging protocol controller set in the charging gun. This enables a single DC charger to connect to multiple electric vehicles via multiple charging cables extending to multiple charging guns, thereby improving the utilization rate of the power conversion unit and reducing the construction cost of the DC charger. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of a DC charging system provided in an embodiment of this application; Figure 2 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 1 ; Figure 3 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 1 ; Figure 4 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 2 ; Figure 5 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 2 ; Figure 6 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 3 ; Figure 7 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 3 ; Figure 8 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 4 ; Figure 9 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 4 ; Figure 10 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 5 ; Figure 11 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 5 ; Figure 12 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 6 ; Figure 13 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 6 ; Figure 14 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 7 ; Figure 15 A schematic diagram of the charging control device for a DC charger provided in an embodiment of this application; Figure 16 This is a schematic diagram of a charging protocol controller provided in an embodiment of this application. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0014] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0015] Furthermore, the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0016] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0017] To better understand this solution, the specific implementation of the DC charging system used in this application will be explained below.

[0018] Figure 1 The schematic diagram of the DC charging system provided in the embodiments of this application is as follows: Figure 1 As shown, the DC charging system may include: a DC charger 10, multiple charging guns 20 and multiple electric vehicles 30.

[0019] The DC charger 10 is connected to multiple charging guns 20 via multiple charging cables, and the charging plug of each charging gun 20 is connected to the charging socket of each electric vehicle 30.

[0020] The device controller 11 in the DC charger 10 is communicatively connected to the charging protocol controller 21 in each charging gun 20, and the charging protocol controller 21 in each charging gun 20 is connected to the vehicle controller 31 in each electric vehicle 30; the device controller 11 is connected to the control terminals of contactor switches C1 and C2 on multiple charging cables in the DC charger 10.

[0021] In this embodiment, a charging gun and an electric vehicle are used as examples to illustrate the specific implementation of the DC charging system.

[0022] like Figure 1 As shown, the DC charger 10 is connected to a charging gun 20 via a charging cable. Contactor switches C1 and C2 are installed on the portion of the charging cable located in the DC charger 10. The device control unit (DCU) 11 is used to control the on / off state of the contactor switches C1 and C2, thereby controlling the output of the DC charger 10.

[0023] Contactor switches C5 and C6 are installed on the charging cable between the rechargeable energy storage system 32 of the electric vehicle 30 and the charging socket. The vehicle controller 31 is used to control the on and off of the contactor switches C5 and C6, thereby controlling the on and off of the vehicle power supply circuit.

[0024] An auxiliary power supply circuit switch S3 and S4 are provided on the power supply cable between the control power supply of the DC charger 10 and the charging gun 20. The power supply cable of the charging gun 20 is connected to the power supply terminal of the vehicle controller 31. The charging protocol controller (Charging Communication Unit, CCU) 21 controls the opening and closing of the auxiliary power supply circuit switch S3 and S4 to control the interaction between the charging protocol controller 21 and the vehicle controller 31.

[0025] In some embodiments, such as Figure 1 As shown, the vehicle plug of the charging gun 20 includes nine interfaces: DC power positive DC+, DC power negative DC-, Protective Earthing (PE), Charging Communication S+, Charging Communication S-, Connection Confirm (CC) namely CC1, CC2, Low-voltage auxiliary power positive A+, and Low-voltage auxiliary power negative A-. Similarly, the vehicle socket of the electric vehicle also includes the same nine interfaces to realize the connection between the vehicle plug and the vehicle socket.

[0026] In some embodiments, the charging cable of the DC charger 10 is provided with a current measurement module, a voltage measurement module, a discharge circuit, a short circuit protection module FUSE, a reverse current protection diode D, an insulation monitoring device (IMD), and a residual current device (RCD).

[0027] In some embodiments, the charging gun 20 is provided with a first control guide resistor R1, a second control guide resistor R2 and a third control guide resistor R3, and the charging socket of the electric vehicle 30 is provided with a fourth control guide resistor R4. When the charging plug of the charging gun 20 is connected to the charging socket of the electric vehicle 30, the fourth control guide resistor R4 is connected to the first control guide resistor R1, changing the voltage value of detection point 1. Therefore, the charging protocol controller 21 can determine the connection state between the charging plug and the charging socket according to the change in the voltage value of detection point 1.

[0028] The electric vehicle is equipped with a fifth control guide resistor R5. When the charging plug of the charging gun 20 is connected to the charging socket of the electric vehicle 30, the fifth control guide resistor R5 is connected to the third guide control resistor R3, changing the voltage value of the detection point 2. Therefore, the vehicle controller 31 can determine the connection status between the charging plug and the charging socket according to the change in the voltage value of the detection point 2.

[0029] The communication connection between the device controller 11 and the charging protocol controller 21 can be wired or wireless. For example, the connection methods can be: power line carrier PLC, CAN / CAN FD, RS-485, Modbus, industrial Ethernet, Bluetooth, Wi-Fi, 4G, 5G, NB-IoT, etc. Different connection methods have different transmission distances and transmission characteristics, which can be selected according to actual deployment needs. This embodiment does not impose any restrictions on this.

[0030] In some embodiments, the device controller 11 integrates a power management module, which manages multiple power conversion units to allocate power conversion units to each electric vehicle.

[0031] The following describes the specific implementation of the charging control method for a DC charger applied to a charging protocol controller, with reference to the embodiments.

[0032] Figure 2 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 1 ,like Figure 2 As shown, the method may include: S101. Obtain the configuration information of the charging gun through the device controller. The configuration information shall include at least the functional information of the charging gun.

[0033] In this embodiment, Figure 3 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 1 ,like Figure 3 As shown, in standby mode, the charging protocol controller periodically sends the charging gun operating status indication information GUN_STATUS_IND to the device controller.

[0034] The charging gun operating status indication information GUN_STATUS_IND can include: charging gun identifier GUN_ID, charging gun connection status, operating status, and operating strategy. The charging gun connection status indicates whether the connection between the charging gun and the electric vehicle is connected or disconnected. The operating status indicates the charging status of the charging gun, such as idle status, charging start status, charging in progress status, charging end status, start failure status, system fault status, etc. The operating strategy indicates that the device controller interacts with the vehicle controller through the charging protocol controller.

[0035] After receiving the charging gun working status indication information GUN_STATUS_IND sent by the charging protocol controller, the device controller, if it determines that it needs to interact with the vehicle controller through the charging protocol controller according to the working strategy, establishes a matching relationship between the charging gun identifier GUN_ID and the communication port PORT_ID, and sends the charging gun configuration information CHARGER_STATUS_IND to the charging protocol controller through the communication port PORT_ID. The configuration information CHARGER_STATUS_IND includes at least the functional information of the charging gun (FUNC_NEGO).

[0036] S102. In response to the successful connection between the charging gun and the electric vehicle, a working status indication message is sent to the device controller, indicating that the charging gun has been connected.

[0037] In this embodiment, after the charging gun is inserted into the electric vehicle, the charging protocol controller detects that the voltage at detection point 1 drops due to the voltage division of the control guide resistor, thus determining that the charging gun is successfully connected to the electric vehicle.

[0038] like Figure 3 As shown, after the charging gun is successfully connected to the electric vehicle, the charging protocol controller sends the charging gun working status indication information GUN_STATUS_IND to the device controller again. At this time, the charging gun connection status in the charging gun working status indication information GUN_STATUS_IND indicates that the connection status between the charging gun and the electric vehicle is connected.

[0039] S103. Based on the start charging command sent by the device controller in response to the user's charging request, a power module association request is sent to the device controller so that the device controller can request power resources from the power management module.

[0040] In this embodiment, since the DC charging system communicates with the vehicle controller via the charging protocol controller, only the charging protocol controller knows the state of the electric vehicle. Therefore, as... Figure 3 As shown, after the device controller confirms that the charging gun is successfully connected to the electric vehicle, if it receives a charging request from the user via the charging start button of the vehicle terminal, mobile terminal, or DC charger, the device controller sends a start charging command START_REQ to the charging protocol controller. Upon receiving the start charging command START_REQ, the charging protocol controller reconfirms the connection status with the electric vehicle. If it confirms that the charging gun is still connected to the electric vehicle, it sends a power module association request DC_MOD_CREATE_REQ to the device controller. Based on the power module association request DC_MOD_CREATE_REQ, the device controller sends a resource request to the power management module. The power management module determines the available power conversion unit from multiple power conversion units and allocates a target power conversion unit to the charging gun from the available power conversion units. After successful allocation, it sends a resource application success notification to the device controller. Based on the resource application success notification, the device controller sends a power module association confirmation DC_MOD_CREATE_CNF notification to the charging protocol controller.

[0041] In some embodiments, the power module association request DC_MOD_CREATE_REQ includes the required charging power, which can be a preset charging power or the required charging power for electric vehicle charging determined by the interaction between the charging protocol controller and the vehicle controller.

[0042] S104. In response to the successful application for power resources by the device controller, the charging process is initiated based on the functional information of the charging gun. The DC charger is controlled by the device controller and the vehicle controller to supply power to the electric vehicle.

[0043] In this embodiment, when the charging protocol controller receives the power module association confirmation DC_MOD_CREATE_CNF notification and determines that the electric vehicle is ready to charge through the vehicle controller, it sends a start charging confirmation START_CNF to the device controller according to the function information of the charging gun to enter the charging process. The device controller and the vehicle controller control the DC charger to supply power to the electric vehicle.

[0044] In one possible implementation, if the functional information includes reservation function information, the configuration information also includes: reservation charging configuration parameters.Figure 4 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 2 ,like Figure 4 As shown, the above-mentioned S104 response to the successful request for power resources from the device controller, and the entry into the charging process based on the charging gun's functional information, the process of controlling the DC charger to supply power to the electric vehicle through the device controller and vehicle controller, may include: S201. In response to the successful application for power resources by the device controller, the scheduled charging parameters of the electric vehicle are obtained through the vehicle controller.

[0045] In this embodiment, as Figure 3 As shown, the configuration function information sent by the device controller to the charging protocol controller may include reservation function information. The configuration information also includes reservation charging configuration parameters (APPOINT). The reservation charging configuration information indicates whether the charging gun supports reservation charging. If it supports reservation charging, it indicates the supported charging time period, the supported charging power, etc.

[0046] Figure 5 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 2 ,like Figure 5 As shown, when the charging protocol controller determines that the charging gun supports the reservation function, it sends a reservation charging information acquisition request to the vehicle controller. The vehicle controller then returns a reservation charging parameter message to the charging protocol controller. The reservation charging parameters include the reservation time period and the reservation charging power.

[0047] S202. Based on the scheduled charging configuration parameters and scheduled charging parameters, determine whether the charging gun meets the scheduled charging conditions for electric vehicles.

[0048] In this embodiment, the charging protocol controller determines whether the reservation time period sent by the vehicle controller meets the charging time period supported by the charging gun and whether the reservation charging power sent by the vehicle controller meets the charging power supported by the charging gun. If both are met, it is determined that the charging gun can meet the reservation charging conditions of the electric vehicle.

[0049] S203. If satisfied, send a scheduled charging request to the device controller. The scheduled charging request includes: scheduled charging parameters.

[0050] In this embodiment, if it is determined that the charging gun can meet the scheduled charging conditions of the electric vehicle, since the DC charger needs to meet the charging needs of multiple electric vehicles, the device controller also needs to determine whether the DC charger can meet the scheduled charging conditions of the electric vehicle.

[0051] like Figure 5As shown, the charging protocol controller sends a scheduled charging request (APPOINTMENT_REQ) to the device controller.

[0052] S204. Send a reservation request confirmation message to the vehicle controller, which is returned by the device controller based on the reservation charging parameters. The reservation request confirmation message includes: charging reservation selection information.

[0053] In this embodiment, the device controller determines, based on the electric vehicle's scheduled charging parameters, whether the charging gun connected to the electric vehicle is idle during the scheduled charging period (other electric vehicles may have already reserved and been assigned the charging gun through the server in advance), and whether the available charging power of the DC charger during the scheduled charging period can meet the electric vehicle's scheduled charging power.

[0054] like Figure 5 As shown, when the device controller determines that the DC charger can meet the electric vehicle's scheduled charging request, it returns a scheduled charging request confirmation message APPOINTMENT_CNF to the charging protocol controller. The charging protocol controller then confirms the scheduled charging selection information in the APPOINTMENT_CNF message, which includes the available scheduled time slots and charging power of the charging gun. The charging protocol controller and the vehicle controller then confirm the final scheduled charging result.

[0055] S205. Send the target charging reservation information selected by the user through the charging reservation selection information to the equipment controller.

[0056] In this embodiment, the charging protocol controller sends the reservation result charging reservation selection information to the device controller so that the device controller can monitor the target charging reservation information and trigger charging when the reservation time arrives.

[0057] S206. Send a power module release request to the device controller to instruct the power management module to release power resources.

[0058] In this embodiment, after the charging gun is connected to the electric vehicle, the charging protocol controller requests power resources through the device controller to determine whether normal charging can be carried out between the DC charger and the electric vehicle. If the charging method is direct charging, charging can continue directly.

[0059] If the charging method is scheduled charging, in order to avoid occupying power resources, you can release the power resources first, and then re-apply for power resources when the scheduled charging time arrives.

[0060] like Figure 5As shown, the charging protocol controller sends a power module release request DC_MOD_RELEASE_REQ to the device controller. The device controller, through the power management module, controls the connection between the target power conversion unit allocated to the electric vehicle and the charging cable of the charging gun to disconnect, so as to release the power resources. After the resources are successfully released, the device controller sends a power module release confirmation DC_MOD_RELEASE_CNF to the charging protocol controller.

[0061] S207. Based on the reservation arrival instruction sent by the device controller, resend the power module association request to the device controller so that the device controller can re-request power resources from the power management module. The reservation arrival instruction is sent by the device controller after determining the arrival time of the reservation charging based on the target charging reservation information.

[0062] In this embodiment, as Figure 5 As shown, when the device controller detects that the scheduled charging time of the electric vehicle has arrived, it sends a scheduled arrival instruction APPOINT_REACH_IND to the charging protocol controller. After determining that the charging gun and the electric vehicle are in a connected state, the charging protocol controller resends the power module association request DC_MOD_CREATE_REQ to the device controller so that the power management module can reallocate the target power conversion unit to the electric vehicle.

[0063] S208. In response to the successful re-application for power resources by the device controller, the DC charger is controlled by the device controller and the vehicle controller to supply power to the electric vehicle.

[0064] In this embodiment, as Figure 5 As shown, the device controller sends a power module association confirmation DC_MOD_CREATE_CNF notification to the charging protocol controller. The device controller can control the contactor switches C1 and C2 to close, and the vehicle controller can control the contactor switches C5 and C6 to close, so that the DC charger can supply power to the electric vehicle.

[0065] In one possible implementation, if the functional information includes self-test functional information, Figure 6 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 3 ,like Figure 6 As shown, in response to the device controller successfully requesting power resources, the method may further include: S301. Send a charger self-test status message to the vehicle controller so that the vehicle controller can lock the electric vehicle.

[0066] In this embodiment, the configuration function information sent by the device controller to the charging protocol controller may include self-test function information. The self-test function is used to instruct the DC charger to perform adhesion, short circuit and insulation detection to ensure charging safety.

[0067] Figure 7 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 3 ,like Figure 7 As shown, before performing a self-test on the DC charger, the charging protocol controller needs to send a charger self-test status message to the vehicle controller to indicate that the DC charger has not yet completed the self-test. Based on the charger self-test status message, the vehicle controller controls the electric vehicle to lock and sends a vehicle lock notification to the charging protocol controller.

[0068] S302. Send a request to the device controller to enable power output, so that the device controller controls the DC contactor on the charging cable to close and controls the DC charger to perform a self-test.

[0069] In this embodiment, as Figure 7 As shown, after determining that the electric vehicle is locked, the charging protocol controller sends an enable power output request PWR_MOD_REQ to the device controller. The device controller controls the power conversion unit to turn on through the power management module. After confirming that the power conversion unit is turned on, it sends an enable power output confirmation PWR_MOD_CNF to the charging protocol controller, so that the charging protocol controller can continuously communicate with the vehicle controller and prevent the vehicle controller from controlling the electric vehicle to exit the lock.

[0070] The equipment controller controls the DC contactor on the charging cable to close, and controls the DC charger to perform adhesion detection, short circuit detection and insulation detection.

[0071] S303. Based on the self-test results, send a request to the device controller to shut down the power output, so that the device controller can disconnect the DC contactor on the charging cable.

[0072] In this embodiment, as Figure 7 As shown, after the charging protocol controller determines that the self-test result of the DC charger is normal, it sends a power output shutdown request PWR_MOD_REQ to the device controller. The device controller controls the power conversion unit to shut down through the power management module and controls the contactor switches C1 and C2 to open. After confirming that the power conversion unit is shut down, the device controller sends a power output shutdown confirmation PWR_MOD_CNF to the charging protocol controller.

[0073] S304. Send the self-test result to the vehicle controller so that the vehicle controller can determine whether to start charging.

[0074] In this embodiment, asFigure 7 As shown, after the charging protocol controller determines that the power conversion unit is off, it sends a charger self-test result message to the vehicle controller to indicate that the charger self-test is successful. The vehicle controller can then control the electric vehicle to exit the locked state and control the contactor switches C5 and C6 to close, entering the charging state.

[0075] In one possible implementation, if the functional information includes: power supply function, Figure 8 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 4 ,like Figure 8 As shown, after the device controller successfully requests power resources in the above S104 response, the method may further include: S401. Obtain the power supply demand information of the electric vehicle based on the charger power supply status message sent to the vehicle controller.

[0076] In this embodiment, when the ambient temperature is low, the battery needs to be heated before charging the electric vehicle to avoid low charging efficiency due to low battery temperature. However, the heating power of the battery is much lower than the charging power of the battery. Therefore, the power supply for the heating stage needs to be separated.

[0077] Figure 9 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 4 ,like Figure 9 As shown, the charging protocol controller sends a charger power supply status message to the vehicle controller to indicate that the DC charger can supply power to the electric vehicle. The vehicle controller can determine whether to supply power to the heating module before charging, based on the battery temperature, so that the heating module can heat the battery. If it is determined that power needs to be supplied to the heating module, the vehicle controller sends a vehicle power supply status message to the charging protocol controller. The vehicle power supply status message contains the electric vehicle's power demand information, i.e., the power supply capacity of the heating module.

[0078] In addition, the vehicle controller periodically sends vehicle power demand messages to the charging protocol controller by monitoring the battery temperature in real time.

[0079] S402. Based on the power demand information, send a request to the equipment controller to enable power output, so that the equipment controller controls the DC contactor on the charging cable to close, and controls the power output of the DC charger through the power management module.

[0080] In this embodiment, as Figure 9As shown, the charging protocol controller sends a power output activation request PWR_MOD_REQ to the device controller based on the power supply demand information. The power output activation request PWR_MOD_REQ carries the power supply power. The device controller controls the activation of the power conversion unit that matches the power supply power through the power management module, and controls the contactor switches C1 and C2 to close, so as to control the DC charger to output power to the electric vehicle.

[0081] S403: Send the power output of the DC charger to the vehicle controller so that the vehicle controller can control the power supply circuit of the electric vehicle to be turned on according to the power output, so as to supply power to the heating module.

[0082] In this embodiment, as Figure 9 As shown, the device controller sends a power output enable confirmation PWR_MOD_CNF to the charging protocol controller. The charging protocol controller periodically sends a charger dynamic output capability message to the vehicle controller. The dynamic capability output message contains the power output of the DC charger. The vehicle controller controls contactor switches C5 and C6 to turn on so that the DC charger supplies power to the heating module, and the heating module heats the battery.

[0083] S404. After power supply is completed, a power output shutdown request is sent to the device controller so that the device controller controls the DC contactor on the charging cable to disconnect.

[0084] In this embodiment, if the vehicle's power supply requirements need to be changed, a new vehicle power supply requirement message is sent to the charging protocol controller. The charging protocol controller then continues to execute the above S402-S403 to adjust the power supply of the DC charger.

[0085] When the vehicle controller detects that the battery has heated to the preset temperature, the heating module no longer needs power and sends a charger power supply completion message to the charging protocol controller. The charging protocol controller sends a power output shutdown request PWR_MOD_REQ to the device controller. The device controller controls the power conversion unit to shut down through the power management module and controls the contactor switches C1 and C2 to open. After confirming that the power conversion unit is shut down, the device controller sends a power output shutdown confirmation PWR_MOD_CNF to the charging protocol controller.

[0086] In one possible implementation, Figure 10 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 5 ,like Figure 10 As shown, S104 above enters the charging process according to the functional information of the charging gun, and controls the DC charger to supply power to the electric vehicle through the equipment controller and vehicle controller, which may include: S501. After confirming that the electric vehicle is ready for charging, a pre-charge start request is sent to the equipment controller so that the equipment controller controls the DC contactor on the charging cable to close and controls the DC charger to output pre-charge power through the power management module to pre-charge the electric vehicle.

[0087] In this embodiment, if the DC charging system supports pre-charging, the electric vehicle can be pre-charged first, and then the formal charging can be carried out after the pre-charging is completed.

[0088] Figure 11 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 5 ,like Figure 11 As shown, the charging protocol controller sends a charger ready status message (not ready) to the vehicle controller. After determining that the electric vehicle is ready to charge, the vehicle controller sends a vehicle ready status message to the charging protocol controller.

[0089] After determining that the electric vehicle is ready for charging, the charging protocol controller sends a precharge start power output request PWR_MOD_REQ to the device controller. The device controller controls the power conversion unit to start and output precharge power through the power management module, and at the same time controls the contactor switches C1 and C2 to be turned on. After confirming that the power conversion unit is turned on, it sends a precharge start power output confirmation PWR_MOD_CNF to the charging protocol controller, so that the charging protocol controller sends a charger ready status message (ready) to the vehicle controller.

[0090] S502, in response to the DC charger starting pre-charging, obtains the charging demand of the electric vehicle through the vehicle controller.

[0091] In this embodiment, as Figure 11 As shown, after determining that the charger is ready to charge, the vehicle controller sends the electric vehicle's charging request to the charging protocol controller. The charging request may include the required power, required voltage, required current, charging mode, etc. The charging mode can be fast charging, slow charging, etc. The charging request is sent to the charging protocol controller periodically.

[0092] S503. Based on the charging demand, send a power adjustment request to the device controller so that the device controller can adjust the output power of the DC charger through the power management module.

[0093] In this embodiment, after the electric vehicle finishes the pre-charging phase, its charging demand will be adjusted. When the charging protocol controller determines that the electric vehicle's charging demand has changed, it sends a power adjustment request REQMNT_IND to the power management module through the device controller, so that the power management module adjusts the output power of the power conversion unit, and sends the charger dynamic output capability CHARGER_CAPABILITY to the charging protocol controller through the device controller.

[0094] S504: Send the output power of the DC charger to the vehicle controller so that the DC charger can charge the electric vehicle.

[0095] In this embodiment, the charging protocol controller sends a charger dynamic output capability message to the vehicle controller to inform the vehicle controller of the maximum output power of the DC charger at this time, so that the vehicle controller can adjust the charging status of the electric vehicle.

[0096] Furthermore, during the energy transfer process between the DC charger and the electric vehicle, the device controller periodically sends charging metering information METER_IND to the user through the server.

[0097] In one possible implementation, Figure 12 A flowchart illustrating the charging control method for a DC charger provided in this application embodiment. Figure 6 ,like Figure 12 As shown, the method may further include: S601. Based on the power capability change information of the DC charger sent by the equipment controller, notify the vehicle controller to update the charging power requirement.

[0098] In this embodiment, Figure 13 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 6 ,like Figure 13 As shown, when the charging strategy of the device controller is adjusted, or the charging power that the power conversion unit can provide changes, the device controller broadcasts the power capability change information CHARGER_CAPABILITY to the charging protocol controllers of multiple charging guns. The charging strategy can be an average strategy, a priority strategy, etc., for the multiple charging guns. The change in the charging power that the power conversion unit can provide can be due to an adjustment in the number of power conversion units, or it could be due to grid power limitations.

[0099] The charging protocol controller sends a dynamic output capability message for the charger to the vehicle controller. The vehicle controller adjusts the charging power demand according to the power changes of the DC charger and sends the charging power demand to the charging protocol controller.

[0100] S602. Send the updated charging demand power to the device controller so that the power management module can determine whether to adjust the number of power conversion units for the electric vehicle.

[0101] In this embodiment, as Figure 13 As shown, when the charging protocol controller determines that the charging power demand of the electric vehicle has changed, it sends a power adjustment request REQMNT_IND to the power management module through the device controller. This allows the power management module to determine whether adjusting only the output power of the current power conversion unit can meet the charging power demand of the electric vehicle. If it cannot, it determines whether the number of connected power conversion units needs to be increased or decreased. The power management module then notifies the device controller whether the number of connected power conversion units needs to be increased or decreased, and charging needs to be suspended.

[0102] S603. Send the pause charging information sent by the device controller to the vehicle controller, so that the vehicle controller controls the electric vehicle to pause charging, and the device controller controls the DC contactor on the charging cable to disconnect. The pause charging information is sent by the power management module when it determines that the number of power conversion units of the electric vehicle is being adjusted.

[0103] In this embodiment, the device controller sends a pause charging request PAUSE_REQ to the charging protocol controller, which in turn sends a pause charging message to the vehicle controller. This causes the vehicle controller to open contactor switches C5 and C6 to stop charging and sends a power output shutdown request PWR_MOD_REQ to the device controller. The device controller then controls the power conversion unit to shut down via the power management module and opens contactor switches C1 and C2. After confirming that the power conversion unit is shut down, the device controller sends a power output shutdown confirmation PWR_MOD_CNF to the charging protocol controller.

[0104] S604. Send the charging recovery information sent by the device controller to the vehicle controller so that the vehicle controller can control the electric vehicle to resume charging. The charging recovery information is sent by the power management module after adjusting the number of power conversion units for the electric vehicle.

[0105] In this embodiment, as Figure 13 As shown, the charging protocol controller sends a pause charging confirmation PAUSE_CNF to the device controller. The device controller then notifies the power management module that the pause was successful, allowing the power management module to adjust the number of power conversion units allocated to the charging gun. After the number of power conversion units is reallocated, the power management module notifies the device controller that the number of power conversion units has been increased / decreased and charging can resume.

[0106] The device controller sends a RESTORE_REQ request to the charging protocol controller, which in turn sends a RESTORE_REQ message to the vehicle controller, causing the vehicle controller to turn on contactor switches C5 and C6 to resume charging.

[0107] S605. Send a request to the device controller to enable power output, so that the device controller controls the DC contactor on the charging cable to close and adjusts the output voltage of the DC charger through the power management module.

[0108] In this embodiment, as Figure 13 As shown, the charging protocol controller sends a power output enable request PWR_MOD_REQ to the device controller. The device controller controls the power conversion unit to turn on through the power management module, adjusts the output voltage to the current voltage of the vehicle interface minus 1V~10V, and controls the contactor switches C1 and C2 to close.

[0109] After confirming that the power conversion unit is turned on, it sends a power output enable confirmation PWR_MOD_CNF to the charging protocol controller. The charging protocol controller then sends a charging recovery confirmation RESTORE_CNF to the device controller. The device controller then notifies the power management module that the recovery was successful.

[0110] The power management module sends the charger dynamic output capability CHARGER_CAPABILITY to the charging protocol controller through the device controller. The charging protocol controller sends the charger dynamic output capability message to the vehicle controller. The vehicle controller adjusts the charging demand power according to the power change of the DC charger and sends the vehicle charging demand message (adjusted power) to the charging protocol controller.

[0111] There are two types of charging termination: vehicle-initiated termination and DC charger-initiated termination. The following will first explain vehicle-initiated termination of charging.

[0112] In one possible implementation, the method may further include: Based on the stop charging information sent by the vehicle controller, a power output shutdown request is sent to the device controller so that the device controller controls the DC contactor on the charging cable to disconnect; a power module release request is sent to the device controller to instruct the power management module to release power resources.

[0113] In this embodiment, Figure 14 Interactive illustration of the charging control method for the DC charger provided in the embodiments of this application Figure 7 ,like Figure 14As shown, when an electric vehicle is fully charged, or when a charging fault occurs during charging, the vehicle controller controls contactor switches C5 and C6 to open. The vehicle controller sends a vehicle charging stop message to the charging protocol controller. The charging protocol controller sends a power output shutdown request PWR_MOD_REQ to the equipment controller. The equipment controller controls the power conversion unit to shut down through the power management module. When the current drops to 5A or below, it controls contactor switches C1 and C2 to open. After confirming that the power conversion unit is shut down, the equipment controller sends a power output shutdown confirmation PWR_MOD_CNF to the charging protocol controller.

[0114] The device controller reads the DC metering information METER_IND, the charging protocol controller sends a vehicle stop charging instruction to the device controller, and the device controller sends the charging metering information to the user through the server.

[0115] In another possible implementation, the method may also include: Based on the charger's end-of-charge information sent by the device controller, a charging stop notification is sent to the vehicle controller; a power output shutdown request is sent to the device controller so that the device controller controls the DC contactor on the charging cable to disconnect; and a power module release request is sent to the device controller to instruct the power management module to release power resources.

[0116] In this embodiment, as Figure 14 As shown, when the device controller receives a stop charging request sent by the user through the server due to a DC charger malfunction, it sends a stop charging request STOP_REQ to the charging protocol controller. The charging protocol controller then sends a charger stop charging message to the vehicle controller and sends a power output shutdown request PWR_MOD_REQ to the device controller. The device controller controls the power conversion unit to shut down through the power management module. Once the current drops to 5A or below, it controls contactor switches C1 and C2 to open. After confirming that the power conversion unit is shut down, the device controller sends a power output shutdown confirmation PWR_MOD_CNF to the charging protocol controller.

[0117] Furthermore, the charging protocol controller sends a power module release request (DC_MOD_RELEASE_REQ) to the device controller. The device controller, through its power management module, controls the disconnection of the connection between the target power conversion unit allocated to the electric vehicle and the charging cable of the charging gun, thereby releasing power resources. After successful resource release, the device controller sends a power module release confirmation (DC_MOD_RELEASE_CNF) to the charging protocol controller. After the user unplugs the charging gun, the charging protocol controller sends a charging gun operating status indication message (GUN_STATUS_IND) to the device controller, indicating that the charging gun connection is disconnected.

[0118] In some embodiments, the charging gun is equipped with an emergency stop button, which is connected to the charging protocol controller. If an emergency stop signal is received from the emergency stop button during charging, the charging protocol controller sends a fault message GUN_FAULT_IND to the device controller. The device controller then shuts down the power output or reports the fault to the backend server for further analysis and processing based on the fault level.

[0119] In addition, the temperature measurement information of the charging gun, GUN_TEMPERATURE_IND, is sent to the device controller by the charging protocol controller.

[0120] The charging control method for DC chargers provided in the above embodiments allows a charging protocol controller installed in the charging gun to interact with the device controller in the DC charger. This enables a single DC charger to connect to multiple electric vehicles via multiple charging cables extending from multiple charging guns, thereby improving the utilization rate of the power conversion unit and reducing the construction cost of the DC charger.

[0121] Based on the above method embodiments, this application also provides a charging control device for a DC charger, which is applied to a charging protocol controller in a charging gun. The charging protocol controller is connected to a vehicle controller in an electric vehicle, and the charging protocol controller is also communicatively connected to a device controller in the DC charger. The device controller is connected to a power management module in the DC charger. Figure 15 This is a schematic diagram of the charging control device for a DC charger provided in an embodiment of this application, as shown below. Figure 15 As shown, the device may further include: The information acquisition module 701 is used to acquire the configuration information of the charging gun through the device controller. The configuration information includes at least the functional information of the charging gun. The information sending module 702 is used to send working status indication information to the device controller in response to the successful connection between the charging gun and the electric vehicle. The working status indication information indicates that the charging gun has been connected. The request sending module 703 is used to send a power module association request to the device controller based on the start charging command sent by the device controller in response to the user's charging request, so that the device controller can request power resources from the power management module. The charging control module 704 is used to respond to the successful request for power resources from the device controller, enter the charging process according to the functional information of the charging gun, and control the DC charger to supply power to the electric vehicle through the device controller and the vehicle controller.

[0122] Optionally, if the functional information includes reservation function information, the configuration information also includes: reservation charging configuration parameters. The information acquisition module 701 is also used to obtain the electric vehicle's reservation charging parameters through the vehicle controller in response to the device controller's successful application for power resources. The status judgment module is used to determine whether the charging gun meets the electric vehicle's scheduled charging conditions based on the scheduled charging configuration parameters and scheduled charging parameters. The request sending module 703 is specifically used to send a scheduled charging request to the device controller if the conditions are met. The scheduled charging request includes: scheduled charging parameters. The information sending module 702 is specifically used to send a reservation request confirmation message returned by the device controller based on the reservation charging parameters to the vehicle controller. The reservation request confirmation message includes: charging reservation selection information. The information sending module 702 is also used to send the target charging reservation information determined by the user through the charging reservation selection information to the device controller; The request sending module 703 is also used to send a power module release request to the device controller to instruct the power management module to release power resources; The request sending module 703 is also used to resend the power module association request to the device controller according to the reservation arrival instruction sent by the device controller, so that the device controller can re-request power resources from the power management module. The reservation arrival instruction is sent by the device controller after determining the arrival time of the reservation charging based on the target charging reservation information. The charging control module 704 is specifically used to control the DC charger to supply power to the electric vehicle in response to the device controller successfully re-applying for power resources.

[0123] Optionally, if the function information includes self-test function information, in response to the device controller successfully applying for power resources, the information sending module 702 is also used to send a charger self-test status message to the vehicle controller so that the vehicle controller can control the electric vehicle to lock. The request sending module 703 is also used to send a power output enable request to the device controller so that the device controller controls the DC contactor on the charging cable to close and controls the DC charger to perform a self-test; based on the self-test result, it sends a power output disable request to the device controller so that the device controller controls the DC contactor on the charging cable to open. The charging control module 704 is also used to send self-test results to the vehicle controller so that the vehicle controller can determine whether to start charging.

[0124] Optionally, if the functional information includes power supply function, in response to the device controller successfully applying for power resources, the information sending module 702 is also used to obtain the power supply demand information of the electric vehicle based on the charger power supply status message sent to the vehicle controller; The request sending module 703 is also used to send a request to the device controller to enable power output based on the power demand information, so that the device controller controls the DC contactor on the charging cable to close, and controls the power output of the DC charger through the power management module. The information sending module 702 is also used to send the power output of the DC charger to the vehicle controller, so that the vehicle controller controls the power supply circuit of the electric vehicle to be turned on according to the power output to supply power to the heating module; The request sending module 703 is also used to send a power output shutdown request to the device controller after the power supply is completed, so that the device controller controls the DC contactor on the charging cable to disconnect.

[0125] Optionally, the charging process begins based on the charging gun's functional information, and the DC charger is controlled by the device controller and vehicle controller to supply power to the electric vehicle, including: The request sending module 703 is also used to send a pre-charge start request to the equipment controller after determining that the electric vehicle is ready for charging, so that the equipment controller controls the DC contactor on the charging cable to close and controls the DC charger to output pre-charge power through the power management module to pre-charge the electric vehicle. The information acquisition module 701 is also used to acquire the charging demand of the electric vehicle through the vehicle controller in response to the DC charger starting pre-charging. The request sending module 703 is also used to send a power adjustment request to the device controller according to the charging demand, so that the device controller can adjust the output power of the DC charger through the power management module; The charging control module 704 is also used to send the output power of the DC charger to the vehicle controller so that the DC charger can charge the electric vehicle.

[0126] Optionally, the information sending module 702 is also used to notify the vehicle controller to update the charging demand power based on the power capability change information of the DC charger sent by the device controller. The information sending module 702 is also used to send the updated charging power demand to the device controller so that the power management module can determine whether to adjust the number of power conversion units for electric vehicles. The information sending module 702 is also used to send the pause charging information sent by the device controller to the vehicle controller, so that the vehicle controller controls the electric vehicle to pause charging and the device controller controls the DC contactor on the charging cable to disconnect. The pause charging information is sent by the power management module when it determines that the number of power conversion units of the electric vehicle is being adjusted. The information sending module 702 is also used to send the charging recovery information sent by the device controller to the vehicle controller, so that the vehicle controller controls the electric vehicle to resume charging. The charging recovery information is sent by the power management module after adjusting the number of power conversion units for the electric vehicle. The request sending module 703 is also used to send a request to the device controller to enable power output, so that the device controller controls the DC contactor on the charging cable to close and adjusts the output voltage of the DC charger through the power management module.

[0127] Optionally, the request sending module 703 is further configured to send a power output shutdown request to the device controller based on the stop charging information sent by the vehicle controller, so that the device controller controls the DC contactor on the charging cable to disconnect; and send a power module release request to the device controller to instruct the power management module to release power resources.

[0128] Optionally, the information sending module 702 is also used to send a charging stop notification to the vehicle controller based on the charger end charging information sent by the device controller; The request sending module 703 is also used to send a power output shutdown request to the device controller so that the device controller controls the DC contactor on the charging cable to disconnect; and to send a power module release request to the device controller so as to instruct the power management module to release power resources.

[0129] The above-described device is used to execute the method provided in the foregoing embodiments, and its implementation principle and technical effect are similar, so they will not be described again here.

[0130] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0131] Figure 16 This is a schematic diagram of a charging protocol controller provided in an embodiment of this application. The charging protocol controller 21 may include a processor 211, a storage medium 212, and a bus. The storage medium 212 stores program instructions executable by the processor 211. When the charging protocol controller 21 is running, the processor 211 communicates with the storage medium 212 via the bus, and the processor 211 executes the program instructions to perform the above-described method embodiment. The specific implementation and technical effects are similar and will not be described in detail here.

[0132] Optionally, this application also provides a computer-readable storage medium storing a computer program, which is executed by a processor to perform the above-described method embodiments.

[0133] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0134] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0135] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0136] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0137] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging control method for a DC charger, characterized in that, A charging protocol controller is applied in a charging gun, the charging protocol controller being connected to a vehicle controller in an electric vehicle, and also communicatively connected to a device controller in a DC charger, the device controller being connected to a power management module in the DC charger, the method comprising: The device controller obtains the configuration information of the charging gun, which includes at least the functional information of the charging gun. In response to the successful connection between the charging gun and the electric vehicle, a working status indication message is sent to the device controller, the working status indication message indicating that the charging gun has been connected; Based on the charging start command sent by the device controller in response to the user's charging request, a power module association request is sent to the device controller, so that the device controller can request power resources from the power management module; In response to the device controller's successful request for the power resources, the charging process begins based on the charging gun's functional information, and the DC charger is controlled by the device controller and the vehicle controller to supply power to the electric vehicle.

2. The method as described in claim 1, characterized in that, If the functional information includes reservation functional information, the configuration information further includes: reservation charging configuration parameters. The process of responding to the device controller's successful application for the power resource, entering the charging process according to the charging gun's functional information, and controlling the DC charger to supply power to the electric vehicle through the device controller and vehicle controller includes: In response to the device controller successfully requesting the power resources, the vehicle controller obtains the scheduled charging parameters of the electric vehicle. Based on the scheduled charging configuration parameters and the scheduled charging parameters, determine whether the charging gun meets the scheduled charging conditions of the electric vehicle; If the conditions are met, a scheduled charging request is sent to the device controller, the scheduled charging request including the scheduled charging parameters; Send a reservation request confirmation message returned by the device controller based on the reservation charging parameters to the vehicle controller. The reservation request confirmation message includes: charging reservation selection information. Send the target charging reservation information determined by the user through the charging reservation selection information to the device controller; Send a power module release request to the device controller to instruct the power management module to release the power resources; Based on the reservation arrival instruction sent by the device controller, the power module association request is resent to the device controller so that the device controller can re-request the power resources from the power management module. The reservation arrival instruction is sent by the device controller after determining the arrival time of the reservation charging based on the target charging reservation information. In response to the device controller successfully re-requesting the power resources, the DC charger is controlled by the device controller and the vehicle controller to supply power to the electric vehicle.

3. The method as described in claim 1, characterized in that, If the functional information includes self-test functional information, the method further includes, in response to the device controller successfully requesting the power resource: Send a charger self-test status message to the vehicle controller so that the vehicle controller can lock the electric vehicle. Send a request to enable power output to the device controller so that the device controller controls the DC contactor on the charging cable to close and controls the DC charger to perform a self-test; Based on the self-test results, a power output shutdown request is sent to the device controller, so that the device controller controls the DC contactor on the charging cable to disconnect. The self-test result is sent to the vehicle controller so that the vehicle controller can determine whether to start charging.

4. The method as described in claim 1, characterized in that, If the functional information includes: power supply function, the method further includes, in response to the device controller successfully requesting the power resource: Based on the charger power supply status message sent to the vehicle controller, obtain the power supply demand information of the electric vehicle; Based on the power demand information, a power output activation request is sent to the device controller, so that the device controller controls the DC contactor on the charging cable to close, and controls the power output of the DC charger through the power management module; The power output of the DC charger is sent to the vehicle controller so that the vehicle controller controls the power supply circuit of the electric vehicle to be turned on according to the power output, so as to supply power to the heating module; After the power supply is completed, a request to shut down the power output is sent to the device controller so that the device controller controls the DC contactor on the charging cable to disconnect.

5. The method as described in claim 1, characterized in that, The step of entering the charging process based on the functional information of the charging gun, and controlling the DC charger to supply power to the electric vehicle through the device controller and the vehicle controller, includes: After determining that the electric vehicle is ready for charging, a pre-charge start request is sent to the device controller, so that the device controller controls the DC contactor on the charging cable to close, and controls the DC charger to output pre-charge power through the power management module to pre-charge the electric vehicle. In response to the DC charger starting pre-charging, the charging demand of the electric vehicle is obtained through the vehicle controller; Based on the charging demand, a power adjustment request is sent to the device controller, so that the device controller can adjust the output power of the DC charger through the power management module; The output power of the DC charger is sent to the vehicle controller so that the DC charger can charge the electric vehicle.

6. The method as described in claim 1, characterized in that, The method further includes: Based on the power capability change information of the DC charger sent by the device controller, the vehicle controller is notified to update the charging power demand. The updated charging power demand is sent to the device controller so that the power management module can determine whether to adjust the number of power conversion units for the electric vehicle. The charging pause information sent by the device controller is sent to the vehicle controller, so that the vehicle controller controls the electric vehicle to pause charging and the device controller controls the DC contactor on the charging cable to disconnect. The charging pause information is sent by the power management module when it determines that the electric vehicle is adjusting the number of power conversion units. The power management module sends the power conversion unit number to the electric vehicle after adjusting the number of power conversion units for the electric vehicle. A power output activation request is sent to the device controller, causing the device controller to close the DC contactor on the charging cable and adjust the output voltage of the DC charger through the power management module.

7. The method as described in claim 1, characterized in that, The method further includes: Based on the stop charging information sent by the vehicle controller, a power output shutdown request is sent to the device controller, so that the device controller controls the DC contactor on the charging cable to disconnect; Send a power module release request to the device controller to instruct the power management module to release the power resources.

8. The method as described in claim 1, characterized in that, The method further includes: Based on the charger's end-of-charge information sent by the device controller, a charging stop notification is sent to the vehicle controller; Send a power output shutdown request to the device controller so that the device controller controls the DC contactor on the charging cable to disconnect; Send a power module release request to the device controller to instruct the power management module to release the power resources.

9. A DC charging system, characterized in that, The DC charging system includes: a DC charger, multiple charging guns, and multiple electric vehicles; The DC charger is connected to the multiple charging guns via multiple charging cables, and the charging plug of each charging gun is connected to the charging socket of each electric vehicle. The device controller in the DC charger is communicatively connected to the charging protocol controller in each charging gun, and the charging protocol controller in each charging gun is connected to the vehicle controller in each electric vehicle. The device controller is connected to the control terminal of the contactor switch on multiple charging cables in the DC charger; The charging protocol controller is used to execute the charging control method of the DC charger as described in any one of claims 1 to 8.

10. A charging protocol controller, characterized in that, include: The device includes a processor, a storage medium, and a bus. The storage medium stores program instructions executable by the processor. When the charging protocol controller is running, the processor communicates with the storage medium via the bus. The processor executes the program instructions to perform the steps of the charging control method for a DC charger as described in any one of claims 1 to 8.

Images