Charging method of electric vehicle and related device

Abstract

The invention discloses a charging method of an electric vehicle and a related device, and the charging method of the electric vehicle comprises the steps: when a double-gun direct current charging mode is switched to a single-gun direct current charging mode, if a first direct current charging port is closed, according to the current maximum allowable charging current of a power battery and the direct current side output current of a vehicle-mounted charger, the single-gun direct current charging port is closed; determining the current maximum allowable charging current of the second direct current charging port; if the second direct-current charging port is closed, the current maximum allowable charging current of the first direct-current charging port is determined according to the current maximum allowable charging current of the power battery, the direct-current side output current of the vehicle-mounted charger and the maximum allowable current of the buck-boost module, the current can be dynamically distributed, starting and stopping of a buck-boost loop are optimized, and the charging efficiency is improved. And the maximum current charging process is optimized.

Description

Technical Field

[0001] This application belongs to the field of electronic technology, and mainly relates to a charging method for electric vehicles and related devices. Background Art

[0002] With the rapid development of new energy vehicles, the proportion of electric vehicles in the automotive market has been increasing year by year. The charging problem is an important issue that electric vehicles focus on. Some electric vehicles are equipped with a dual-gun DC charging circuit to solve the problem of insufficient output voltage and power of DC charging equipment.

[0003] In the current dual-gun DC charging technology, two charging circuits are used to charge an electric vehicle, and the charging current of both charging guns is evenly distributed to half of the maximum allowable charging current of the battery. However, the maximum allowable charging current of the power battery at the end of charging in this scheme is relatively small. If continuous dual-gun DC charging is carried out, it will waste public resources and cause dissatisfaction among other vehicle owners. In addition, if the power of one gun decreases or fails to reach the requested current value, the charging current cannot overflow to the other charging gun, resulting in the inability to charge at the maximum current. Summary of the Invention

[0004] An object of this application is to provide a charging method for electric vehicles and related devices, and its advantage lies in dynamically distributing current, optimizing the enabling and stopping of the buck-boost circuit, and optimizing the process of maximum current charging.

[0005] To achieve the above object, in a first aspect, this application provides a charging method for an electric vehicle, which is applied to a charging system of a dual-charging-port electric vehicle. The charging system includes a first DC charging port, a second DC charging port, a buck-boost module, an on-vehicle charger, a control unit, and a power battery. After the first DC charging port is connected to the buck-boost module and then to the power battery, the second DC charging port is connected to the power battery. The method includes:

[0006] When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, determine the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the output current of the DC side of the on-vehicle charger; if the second DC charging port is closed, determine the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the output current of the DC side of the on-vehicle charger, and the maximum allowable current of the buck-boost module.

[0007] It can be understood that when switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is determined according to the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger. If the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is determined according to the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum allowable current of the buck-boost module. This can dynamically allocate the current, optimize the enabling and stopping of the buck-boost circuit, and optimize the process of maximum current charging.

[0008] In a possible example, the charging system further includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The control unit is connected to each contactor and is used to control the switching of each contactor. Among them, the first DC charging port is connected to the buck-boost module through the first contactor and the second contactor, and then connected to the power battery. The second DC charging port is connected to the power battery through the third contactor and the fourth contactor.

[0009] It can be understood that the charging system further includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The control unit is connected to each contactor and is used to control the switching of each contactor. Among them, the first DC charging port is connected to the buck-boost module through the first contactor and the second contactor, and then connected to the power battery. The second DC charging port is connected to the power battery through the third contactor and the fourth contactor, which can greatly improve the control accuracy of the control unit.

[0010] In a possible example, when the current maximum allowable charging current of the power battery is less than or equal to the first threshold, the current maximum allowable charging current of the second DC charging port is the result of multiplying the difference between the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger by the first ratio. The current maximum allowable charging current of the first DC charging port is the current maximum allowable charging current of the power battery minus the current charging current of the second DC charging port. When the current maximum allowable charging current of the power battery is greater than the first threshold, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger and then minus the first preset value. The current maximum allowable charging current of the first DC charging port is the minimum value between the maximum allowable current of the buck-boost module and the result of subtracting the current charging current of the second DC charging port and the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery.

[0011] It can be understood that when the current maximum allowable charging current of the power battery is less than or equal to the first threshold, the current maximum allowable charging current of the second DC charging port is the result of multiplying the difference between the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger by the first ratio. The current maximum allowable charging current of the first DC charging port is the current maximum allowable charging current of the power battery minus the current charging current of the second DC charging port. When the current maximum allowable charging current of the power battery is greater than the first threshold, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger and then minus the first preset value. The current maximum allowable charging current of the first DC charging port is the minimum value of the maximum allowable current of the buck-boost module and the result of subtracting the current charging current of the second DC charging port and the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery, which can greatly improve the efficiency of dual-gun DC charging.

[0012] In a possible example, when the first DC charging port is closed, determining the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger includes:

[0013] When the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger.

[0014] It can be understood that when the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger, which can optimize the process of switching to single-gun DC charging.

[0015] In a possible example, when the second DC charging port is closed, determining the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum allowable current of the buck-boost module includes:

[0016] When the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value of the result of subtracting the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum allowable current of the buck-boost module.

[0017] It can be understood that if the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value between the result of subtracting the DC-side output current of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum allowable current of the buck-boost module, which can optimize the process of switching to single-gun DC charging.

[0018] In a possible example, when the remaining battery power percentage of the power battery is greater than a second threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and a second preset value, the first DC charging port is closed and the user is reminded.

[0019] It can be understood that when the remaining battery power percentage of the power battery is greater than a second threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and a second preset value, closing the first DC charging port and reminding the user can improve the service life of the buck module.

[0020] In a second aspect, a device for charging an electric vehicle includes a module for executing the method provided in the first aspect or any implementation manner of the first aspect.

[0021] In a third aspect, an electric vehicle includes a device for executing the device provided in the second aspect or any implementation manner of the second aspect.

[0022] In a fourth aspect, a charging device for an electric vehicle includes a processor, a memory, and one or at least one program, wherein the one or at least one program is stored in the memory and is configured to be executed by the processor, and the program includes instructions for executing the method provided in the first aspect or any implementation manner of the first aspect.

[0023] In a fifth aspect, a computer-readable storage medium stores a computer program, and the computer program enables a computer to execute to implement the method provided in the first aspect or any implementation manner of the first aspect.

[0024] Implementing the present application will have the following beneficial effects: dynamically allocating current, optimizing the enabling and stopping of the buck-boost circuit, and optimizing the process of maximum current charging. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the present application or the prior art. Obviously, the drawings in the following description are only some examples of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0026] Figure 1 FIG. is an application scenario diagram of dual-gun to single-gun DC charging for an electric vehicle provided by the present application;

[0027] Figure 2 FIG. is a schematic diagram of dual-gun to single-gun DC charging application for an electric vehicle provided by the present application;

[0028] Figure 3 FIG. is a schematic structural diagram of a direct connection boost charging circuit for an electric vehicle provided by the present application;

[0029] Figure 4 FIG. is a schematic structural diagram of a shared boost charging circuit for an electric vehicle provided by the present application;

[0030] Figure 5 FIG. is a schematic flow diagram of a direct connection boost charging circuit for an electric vehicle provided by the present application;

[0031] Figure 6 FIG. is a schematic flow diagram of a shared boost charging circuit for an electric vehicle provided by the present application;

[0032] Figure 7 FIG. is a schematic structural diagram of a dual-gun to single-gun DC charging device for an electric vehicle provided by the present application;

[0033] Figure 8 FIG. is a structural diagram of a dual-gun to single-gun DC charging device for an electric vehicle provided by the present application. Detailed implementation manners

[0034] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the present application in conjunction with the drawings in the present application. Obviously, the described examples are only some examples of the present application, rather than all. Based on the examples in the present application, all other examples obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.

[0035] The terms "1", "2", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising", "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0036] Reference to "embodiment" in this context means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one example of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] Please refer to Figure 1 , Figure 1 which is an application scenario diagram for switching a dual-gun to a single-gun DC charging of an electric vehicle provided for this application. As Figure 1 shown, the application scenario diagram includes a user 101, an electronic device 102, a server 103, a dual-charging-port electric vehicle 104, and a charging pile 105. It should be noted that Figure 1 the number of each device in the system shown, the form of each device, and the number of users are for illustration purposes and do not constitute a limitation to this application. One user can use multiple electronic devices, one user can use multiple dual-charging-port electric vehicles, and one user can use multiple charging piles.

[0038] Among them, the user 101 is the user who actually operates the electronic device 102 to control the electronic device 102 to perform corresponding operations. The electronic device 102 can be Figure 1 the laptop computer shown, and can also be a personal computer (PC), an all-in-one computer, a palm computer, a tablet computer (pad), a desktop computer, a smart phone, a smart TV playback terminal, and a portable device, etc. For electronic devices on the PC side, such as all-in-one computers, etc., their operating systems can include but are not limited to operating systems such as Linux system, Unix system, Windows series systems (such as Windows xp, Windows 7, etc.). For electronic devices on the mobile side, such as smart phones, etc., their operating systems can include but are not limited to operating systems such as Android system, IOS (the operating system of Apple phones), Window system, etc. The dual-charging-port electric vehicle 104 can be a small passenger car, a general passenger car, a luxury passenger car, and a multi-purpose passenger car, etc.

[0039] Please refer toFigure 2 , Figure 2 is a schematic diagram of an electric vehicle charging application provided for this application. The first electronic device 201 can install the electric vehicle charging application 202 as shown in Figure 2 . The user of the first electronic device 201 is the user. When the user performs a trigger operation on the electric vehicle charging application 202 installed in the first electronic device 201 (for example, clicks the icon of the electric vehicle charging application 202), the first electronic device 201 can start the installed electric vehicle charging application 202 and enter the electric vehicle charging application 202. When the user finishes using the application, the user can also click the home page 203 to return to the initial interface of the first electronic device 201.

[0040] Please refer to Figure 3 , Figure 3 is a schematic diagram of the structure of a direct-connected boost charging circuit for an electric vehicle provided for this application. As shown in the figure, the schematic diagram includes the following components: a DC charging port 301, a buck-boost module 302, a power battery 303, a first contactor 304, a second contactor 305, a third contactor 306, a fourth contactor 307, a DC charging port 308, a control unit 309, an AC charging port 310, and an on-vehicle charger 311. After the DC charging port 301 is connected to the buck-boost module 302 through the first contactor 304 and the second contactor 305, it is connected to the power battery 303. The DC charging port 308 is connected to the power battery 303 through the third contactor 306 and the fourth contactor 307. The control unit 309 is connected to each controller and is used to control the switches of each controller. It should be noted that in addition to the two DC charging ports, the electric vehicle in this application also has an AC charging function. After the AC charging port 310 is connected to the on-vehicle charger 311, it is connected to the power battery 303. The AC charging process, the charging process of the DC charging port 301, and the charging process of the DC charging port 308 can be performed in parallel.

[0041] Please refer to Figure 4 , Figure 4The figure is a schematic structural diagram of a shared boost charging circuit for an electric vehicle provided by this application. As shown in the figure, the schematic structural diagram includes the following components: a first DC charging port 301, a buck-boost module 302, a power battery 303, a first contactor 304, a second contactor 305, a third contactor 306, a fourth contactor 307, a second DC charging port 308, a control unit 309, an AC charging port 310, and an on-vehicle charger 311. After the first DC charging port 301 is connected to the buck-boost module 302 through the first contactor 304 and the second contactor 305, it is connected to the power battery 303. The second DC charging port 308 is connected to the buck-boost module 302 through the third contactor 306 and the fourth contactor 307, and then connected to the power battery 303. The control unit 309 is connected to each controller and is used to control the switches of each controller. It should be noted that in addition to the two DC charging ports, the electric vehicle in this application also has an AC charging function. After the AC charging port 310 is connected to the on-vehicle charger 311, it is connected to the power battery 303. The AC charging process, the charging process of the first DC charging port 301, and the charging process of the second DC charging port 308 can be carried out in parallel.

[0042] Please refer to Figure 5 , Figure 5 The figure is a schematic flowchart of a direct connection boost charging circuit for an electric vehicle provided by this application. Taking the process of applying this method to the direct connection boost charging circuit of an electric vehicle as an example, the device of the schematic flowchart of the direct connection boost charging circuit of the electric vehicle may include a server or an electronic device. The method includes the following steps S501 - S502, where

[0043] S501: When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, determine the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the output current of the DC side of the on-vehicle charger.

[0044] S502: If the second DC charging port is closed, determine the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the output current of the DC side of the on-vehicle charger, and the maximum allowable current of the buck-boost module.

[0045] In a possible example, the charging system further includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The control unit is connected to each contactor and is used to control the switches of each contactor. Among them, the first DC charging port is connected to the buck-boost module through the first contactor and the second contactor and then connected to the power battery, and the second DC charging port is connected to the power battery through the third contactor and the fourth contactor.

[0046] In a possible example, when the current maximum allowable charging current of the power battery is less than or equal to the first threshold, the current maximum allowable charging current of the second DC charging port is the result of multiplying the difference between the current maximum allowable charging current of the power battery and the output current of the DC side of the on-vehicle charger by the first ratio. The current maximum allowable charging current of the first DC charging port is the current maximum allowable charging current of the power battery minus the current charging current of the second DC charging port.

[0047] For example, when the first threshold is 60 amperes, the current maximum allowable charging current of the power battery is 128 amperes, the output current of the DC side of the on-vehicle charger is 80 amperes, and the first ratio is 0.5, the current maximum allowable charging current of the second DC charging port is: (128 - 80) × 0.5.

[0048] In a possible example, when the current maximum allowable charging current of the power battery is greater than the first threshold, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current of the DC side of the on-vehicle charger minus the first preset value. The current maximum allowable charging current of the first DC charging port is the minimum value between the maximum allowable current of the buck-boost module and the result of subtracting the current charging current of the second DC charging port from the current maximum allowable charging current of the power battery and then subtracting the output current of the DC side of the on-vehicle charger.

[0049] For example, when the first threshold is 60 amperes, the current maximum allowable charging current of the power battery is 126 amperes, the output current of the DC side of the on-vehicle charger is 70 amperes, and the first preset value is 30 amperes, the current maximum allowable charging current of the second DC charging port is: 126 - 70 - 30.

[0050] In a possible example, step S501 includes A1: If the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current of the DC side of the on-vehicle charger.

[0051] For example, when the current maximum allowable charging current of the power battery is 118 amperes and the output current of the DC side of the on-vehicle charger is 80 amperes, the current maximum allowable charging current of the second DC charging port is: 118 - 80.

[0052] In a possible example, step S502 includes A2: If the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value between the result of subtracting the output current of the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum allowable current of the buck-boost module.

[0053] For example, when the maximum allowable charging current of the power battery is 116 amperes, the output current on the DC side of the on-vehicle charger is 75 amperes, and the maximum allowable current of the buck-boost module is 44 amperes, the result of 116 minus 75 is 41. Since 41 is less than 44, the current maximum allowable charging current of the first DC charging port is 41 amperes.

[0054] In a possible example, when the remaining battery power percentage of the power battery is greater than the second threshold, and the maximum output current of the charging pile at the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and the second preset value, the first DC charging port is closed and the user is reminded.

[0055] For example, when the remaining battery power percentage of the power battery is 96%, the second threshold is 95%, the current maximum allowable charging current of the power battery is 120 amperes, the current maximum allowable charging current of the power battery is 40 amperes, and the second preset value is 20 amperes, since 96% is greater than 95%, the result of multiplying 40 by 2 and then adding 20 is 100, and 120 is greater than 100, so the first DC charging port is closed and the user is reminded.

[0056] Please refer to Figure 6 , Figure 6 FIG. is a schematic flow chart of a shared boost charging circuit for an electric vehicle provided by the present application. Taking the application of this method in the process of the shared boost charging circuit of an electric vehicle as an example, the device of the schematic flow chart of the shared boost charging circuit of the electric vehicle may include a server or an electronic device. The method includes the following steps S601 - S602, where

[0057] S601: When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, then according to the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum charging current of the second DC charging port, determine the current maximum allowable charging current of the second DC charging port.

[0058] S602: If the second DC charging port is closed, then according to the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum charging current of the first DC charging port, determine the current maximum allowable charging current of the first DC charging port.

[0059] In a possible example, if the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the minimum value between the result of subtracting the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum charging current of the second DC charging port.

[0060] For example, the current maximum allowable charging current of the power battery is 116 amperes, the output current of the DC side of the on-vehicle charger is 56 amperes, and the maximum charging current of the second DC charging port is 70 amperes. The result of 116 minus 56 is 60. Since 60 is less than 70, the current maximum allowable charging current of the second DC charging port is 60 amperes.

[0061] In a possible example, if the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value between the result of subtracting the output current of the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum charging current of the first DC charging port.

[0062] For example, the current maximum allowable charging current of the power battery is 114 amperes, the output current of the DC side of the on-vehicle charger is 40 amperes, and the maximum charging current of the first DC charging port is 60 amperes. The result of 114 minus 40 is 74 amperes. Since 74 is greater than 60, the current maximum allowable charging current of the first DC charging port is 60 amperes.

[0063] For example, the current maximum allowable charging current of the power battery is 112 amperes, and the output current of the DC side of the on-vehicle charger is 62 amperes.

[0064] In a possible example, when the remaining battery power percentage of the power battery is greater than the fourth threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and the fourth preset value, the first DC charging port is closed and the user is reminded.

[0065] For example, when the remaining battery power percentage of the power battery is 97%, the fourth threshold is 95%, the current maximum allowable charging current of the power battery is 118 amperes, the current maximum allowable charging current of the power battery is 38 amperes, and the second preset value is 20 amperes. Since 97% is greater than 95%, 38 multiplied by 2, and then adding 20 results in 96, and 118 is greater than 96, the first DC charging port is closed and the user is reminded.

[0066] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of a dual-gun to single-gun DC charging device for an electric vehicle provided by this application. Based on the above system architecture, the dual-gun to single-gun DC charging device 700 for an electric vehicle provided by this application can be a server or a unit in the server. The dual-gun to single-gun DC charging device 700 for an electric vehicle at least includes: a receiving module 701, a control module 702, an adjustment module 703, and a processing module 704. Among them, when the dual-gun to single-gun DC charging device 700 for an electric vehicle is in the direct connection boost state,

[0067] The receiving module 701 receives the shutdown information, adjustment information, and processing information;

[0068] When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the processing module 704 shuts down the first DC charging port, the adjustment module 703 determines the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger. If the processing module 704 shuts down the second DC charging port, the adjustment module 703 determines the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum allowable current of the buck-boost module;

[0069] When the preset conditions at the end of charging are met, the adjustment module 703 shuts down any one of the DC charging ports.

[0070] In a possible example, the control module 702 further includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The control module 702 is connected to each contactor and is used to control the on / off of each contactor. Among them, after the first DC charging port is connected to the buck-boost module through the first contactor and the second contactor, it is then connected to the power battery. The second DC charging port is connected to the power battery through the third contactor and the fourth contactor.

[0071] In a possible example, when the current maximum allowable charging current of the power battery is less than or equal to the first threshold, the adjustment module 703 makes the current maximum allowable charging current of the second DC charging port be the result of multiplying the difference between the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger by the first ratio. The current maximum allowable charging current of the first DC charging port is the current maximum allowable charging current of the power battery minus the current charging current of the second DC charging port. When the current maximum allowable charging current of the power battery is greater than the first threshold, the adjustment module 703 makes the current maximum allowable charging current of the second DC charging port be the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger and then minus the first preset value. The current maximum allowable charging current of the first DC charging port is the minimum value of the maximum allowable current of the buck-boost module and the result of subtracting the current charging current of the second DC charging port and the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery.

[0072] In a possible example, if the first DC charging port is shut down, the adjustment module 703 makes the current maximum allowable charging current of the second DC charging port be the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger.

[0073] In a possible example, if the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port of the adjustment module 703 is the minimum value between the result of subtracting the DC side output current of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum allowable current of the buck-boost module.

[0074] In a possible example, when the remaining battery power percentage of the power battery is greater than the second threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and the second preset value, the processing module 704 closes the first DC charging port and reminds the user.

[0075] The dual-gun to single-gun DC charging device 700 of the electric vehicle is in the shared boost state.

[0076] The receiving module 701 receives the shutdown information, adjustment information, and processing information.

[0077] When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the processing module 704 closes the first DC charging port, the adjustment module 703 determines the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery, the DC side output current of the on-vehicle charger, and the maximum charging current of the second DC charging port. If the processing module 704 closes the second DC charging port, the adjustment module 703 determines the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the DC side output current of the on-vehicle charger, and the maximum charging current of the first DC charging port.

[0078] When the preset conditions at the end of charging are met, the adjustment module 703 closes any one of the DC charging ports.

[0079] In a possible example, the control module 702 includes at least one control unit. The control unit is at least one on-vehicle controller or power battery manager integrating the DC charging function; the control unit includes a first independent DC charging control pilot circuit and a second independent DC charging control pilot circuit; the control unit conducts controller area network signal interaction with the charging pile through the charging subnet to control each stage of DC charging and control the DC charging contactors of the two DC charging circuits; when the control unit is other controllers, the control unit conducts signal interaction with the power battery manager. The power battery manager monitors the state of the power battery cells during DC charging and calculates the remaining battery power percentage of the battery pack; when the charging conditions of the power battery are not met, the DC charging control is terminated via the control unit; the control unit conducts signal interaction with the buck-boost module.

[0080] In a possible example, if the first DC charging port is closed, the adjustment module 703 makes the current maximum allowable charging current of the second DC charging port be the minimum value between the result of subtracting the DC side output current of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum charging current of the second DC charging port.

[0081] In a possible example, if the second DC charging port is closed, the adjustment module 703 makes the current maximum allowable charging current of the first DC charging port be the minimum value between the result of subtracting the DC side output current of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum charging current of the first DC charging port.

[0082] In a possible example, when the remaining battery power percentage of the power battery is greater than the fourth threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and the fourth preset value, the processing module 704 closes the first DC charging port and reminds the user.

[0083] Please refer to Figure 8 , Figure 8 which is the structural diagram of a dual-gun to single-gun DC charging device for an electric vehicle provided by this application. As Figure 8 shown, the dual-gun to single-gun DC charging device 800 of the electric vehicle includes a processor 801, a memory 802, a communication interface 804, and one or more programs 803. The above one or more programs 803 are stored in the above memory 802 and are configured to be executed by the above processor 801. In the direct connection boost state, the above one or more programs 803 include instructions for performing the following steps:

[0084] When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, determine the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the DC side output current of the on-vehicle charger; if the second DC charging port is closed, determine the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the DC side output current of the on-vehicle charger, and the maximum allowable current of the buck-boost module.

[0085] In a possible example, the one or more programs 803 are specifically used to execute the instructions for performing the following steps:

[0086] The charging system further includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The control unit is connected to each contactor and is used to control the on-off of each contactor. Among them, the first DC charging port is connected to the buck-boost module through the first contactor and the second contactor, and then connected to the power battery. The second DC charging port is connected to the power battery through the third contactor and the fourth contactor.

[0087] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0088] When the current maximum allowable charging current of the power battery is less than or equal to the first threshold, the current maximum allowable charging current of the second DC charging port is the result of multiplying the difference between the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger by the first ratio. The current maximum allowable charging current of the first DC charging port is the current maximum allowable charging current of the power battery minus the current charging current of the second DC charging port.

[0089] When the current maximum allowable charging current of the power battery is greater than the first threshold, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger minus the first preset value. The current maximum allowable charging current of the first DC charging port is the minimum value between the maximum allowable current of the buck-boost module and the result of subtracting the current charging current of the second DC charging port and the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery.

[0090] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0091] If the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger.

[0092] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0093] If the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value between the result of subtracting the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum allowable current of the buck-boost module.

[0094] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0095] When the percentage of the remaining power of the power battery is greater than the second threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and the second preset value, close the first DC charging port and remind the user.

[0096] In the shared boost state, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0097] When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is determined based on the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum charging current of the second DC charging port. If the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is determined based on the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum charging current of the first DC charging port.

[0098] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0099] If the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the minimum value between the result of subtracting the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum charging current of the second DC charging port.

[0100] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0101] If the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value between the result of subtracting the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum charging current of the first DC charging port.

[0102] In a possible example, one or more programs 803 are specifically configured to execute instructions for the following steps:

[0103] When the percentage of the remaining power of the power battery is greater than the fourth threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to the sum of twice the current maximum allowable charging current of the power battery and the fourth preset value, the first DC charging port is closed and the user is reminded.

[0104] Those skilled in the art can understand that for the sake of convenience of description, Figure 8 only one memory 802 and one processor 801 are shown in. In an actual terminal or server, there may be multiple processors and memories. The memory can also be referred to as a storage medium or a storage device, etc., and the present application makes no limitation thereto.

[0105] It should be understood that in this application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor may also adopt a general-purpose microprocessor, a graphics processing unit (GPU), or one or more integrated circuits to execute relevant programs to implement the functions required to be executed in this application.

[0106] The processor 801 may also be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of this application may be completed by the integrated logic circuit in the hardware of the processor 801 or instructions in software form. The above-mentioned processor 801 may implement or execute each method, step, and logic block diagram disclosed in this application. The steps of the method disclosed in combination with this application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802 and combines its hardware to complete the functions required to be executed by the method, device, and unit included in the storage medium of this application.

[0107] It should also be understood that the memory mentioned in this application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM). The memory may also be a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or any other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor through a bus. The memory may also be integrated with the processor. The memory may store a program, and when the program stored in the memory is executed by the processor, the processor is used to execute each step in the above embodiments.

[0108] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) is integrated in the processor. It should be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0109] It should be understood that the term "and / or" in this text is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0110] In the implementation process, each step of the above method can be completed by the integrated logic circuit in the hardware of the processor or instructions in the form of software. The steps of the method disclosed in combination with this application can be directly embodied as being executed and completed by the hardware processor, or executed and completed by the combination of the hardware and software modules in the processor. The software module can be located in mature storage media in the art such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. This storage media is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0111] Those of ordinary skill in the art can realize that the various illustrative logical blocks (ILB) and steps described in combination with the embodiments disclosed in this text can be implemented by electronic hardware, or by the combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0112] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer-programmed program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a processor, the processes or functions according to the present application are generated in whole or in part. The computer can be a general-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber) or wirelessly (such as infrared, wireless, microwave, etc.), or can be transmitted from one website, computer, server, or data center to a mobile phone processor by wire. The computer-readable storage medium can be any available medium that the computer can access or a data storage device such as a server, data center, etc. that contains one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk), an optical medium (such as a DVD), or a semiconductor medium (such as a solid-state drive), etc.

[0113] The above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application.

Claims

1. A charging method for an electric vehicle, characterized in that, it is applied to a charging system of an electric vehicle with dual charging ports. The charging system includes a first DC charging port, a second DC charging port, a buck-boost module, an on-vehicle charger, a control unit, and a power battery. After the first DC charging port is connected to the buck-boost module and then connected to the power battery, the second DC charging port is connected to the power battery. The method includes: When switching from the dual-gun DC charging mode to the single-gun DC charging mode, if the first DC charging port is closed, determine the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger; if the second DC charging port is closed, determine the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the output current on the DC side of the on-vehicle charger, and the maximum allowable current of the buck-boost module.

2. The method according to claim 1, characterized in that, the charging system further includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The control unit is connected to each contactor and is used to control the on-off of each contactor. Among them, the first DC charging port is connected to the buck-boost module through the first contactor and the second contactor and then connected to the power battery, and the second DC charging port is connected to the power battery through the third contactor and the fourth contactor.

3. The method according to claim 1, characterized in that, when the current maximum allowable charging current of the power battery is less than or equal to a first threshold, the current maximum allowable charging current of the second DC charging port is the result of multiplying the difference between the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger by a first ratio, and the current maximum allowable charging current of the first DC charging port is the current maximum allowable charging current of the power battery minus the current charging current of the second DC charging port; when the current maximum allowable charging current of the power battery is greater than the first threshold, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the output current on the DC side of the on-vehicle charger and then minus a first preset value, and the current maximum allowable charging current of the first DC charging port is the minimum value of the maximum allowable current of the buck-boost module and the result of subtracting the current charging current of the second DC charging port and the output current on the DC side of the on-vehicle charger from the current maximum allowable charging current of the power battery.

4. The method according to claim 1, characterized in that, the step of, if the first DC charging port is closed, determining the current maximum allowable charging current of the second DC charging port according to the current maximum allowable charging current of the power battery and the output current on the DC side of the on-vehicle charger includes: If the first DC charging port is closed, the current maximum allowable charging current of the second DC charging port is the current maximum allowable charging current of the power battery minus the DC-side output current of the on-vehicle charger.

5. The method according to claim 1, wherein, when the second DC charging port is closed, determining the current maximum allowable charging current of the first DC charging port according to the current maximum allowable charging current of the power battery, the DC-side output current of the on-vehicle charger, and the maximum allowable current of the buck-boost module, includes: If the second DC charging port is closed, the current maximum allowable charging current of the first DC charging port is the minimum value between the result of subtracting the DC-side output current of the on-vehicle charger from the current maximum allowable charging current of the power battery and the maximum allowable current of the buck-boost module.

6. The method according to claim 1, wherein, the method further includes: When the remaining power percentage of the power battery is greater than the second threshold, and the maximum output current of the charging pile of the second DC charging port is greater than or equal to twice the sum of the current maximum allowable charging current of the power battery and the second preset value, close the first DC charging port and remind the user.

7. An electric vehicle charging device, wherein, configured to execute the method according to any one of claims 1-6.

8. An electric vehicle, wherein, comprises the device according to claim 7.

9. An electric vehicle charging equipment, wherein, includes a processor, a memory, and one or at least one program, wherein the one or at least one program is stored in the memory and is configured to be executed by the processor, and the program includes instructions for executing the method according to any one of claims 1-6.

10. A computer-readable storage medium, wherein, the computer-readable storage medium stores a computer program, and the computer program enables a computer to execute to implement the method according to any one of claims 1-6.

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