Vehicle charging system and control method thereof

Abstract

The present invention discloses a vehicle charging system and a control method for the vehicle charging system, which relates to the technical field of vehicles. Among them, the vehicle charging system includes: a first power distribution circuit, a second power distribution circuit, a third power distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first power distribution circuit includes a first power battery pack, a second power battery pack, and a switching circuit. The switching circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to a first voltage threshold. The switching circuit is used to control the electrical connection relationship between the first power battery pack and the second power battery pack. The second power distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The operating voltage of any load in the load circuit is greater than a preset voltage threshold. The present invention solves the technical problem in the related art that using a motor and a motor controller to perform high-power boost charging on a vehicle results in high costs.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a vehicle charging system and a control method for the vehicle charging system. Background Art

[0002] In the field of electric vehicles, a motor and a motor controller are usually used to perform high-power boost charging on a vehicle, so that the vehicle can be efficiently charged, and the energy utilization rate of the whole vehicle is improved.

[0003] However, when using a motor and a motor controller to perform high-power boost charging on a vehicle, since the motor and the motor controller generate radiation during operation, there is a problem of electromagnetic compatibility (EMC) radiation emission of the whole vehicle, and it is necessary to effectively control and rectify the motor and the motor controller, resulting in a high rectification cost. In addition, using the above method of using a motor and a motor controller to perform high-power boost charging on a vehicle will also result in a high cost of the high-voltage system filter module. Summary of the Invention

[0004] Embodiments of the present invention provide a vehicle charging system and a control method for the vehicle charging system, so as to at least solve the technical problem of high cost caused by using a motor and a motor controller to perform high-power boost charging on a vehicle in the related art.

[0005] According to one embodiment of the present invention, a vehicle charging system is provided. The vehicle charging system includes: a first power distribution circuit, a second power distribution circuit, a third power distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first power distribution circuit includes a first power battery pack, a second power battery pack, and a switching circuit. The switching circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the parallel connection of the first power battery pack and the second power battery pack is less than or equal to a first voltage threshold. The switching circuit is used to control the electrical connection form of the first power battery pack and the second power battery pack. The second power distribution circuit includes a boost relay, a fast charging positive switch, and a fast charging negative switch. The second power distribution circuit is used to control the charging state of the vehicle charging system. The third power distribution circuit is used to control the conduction state between the first power distribution circuit and the load circuit. The working voltage of any load in the load circuit is greater than a preset voltage threshold. The electric drive system is used to drive the vehicle where the vehicle charging system is located. The DC charging socket is used to receive the direct current input from a charging pile outside the vehicle. The first voltage threshold is less than the preset voltage threshold; the positive electrode of the first power battery pack is electrically connected to the first port of the fast charging positive switch, the second port of the fast charging positive switch is electrically connected to the positive electrode interface of the DC charging socket, the negative electrode of the first power battery pack is electrically connected to the first port of the series switch, the second port of the series switch is electrically connected to the positive electrode of the second power battery pack, the negative electrode of the second power battery pack is electrically connected to the negative electrode interface of the DC charging socket, and the second port of the fast charging negative switch is used to input a negative direct current interface; the first port of the parallel negative switch is electrically connected to the negative electrode of the first power battery pack, the second port of the parallel negative switch is used to input a negative direct current, the first port of the parallel positive switch is electrically connected to the positive electrode of the second power battery pack, and the second port of the parallel positive switch is electrically connected to the first port of the fast charging positive switch; the first power distribution circuit is electrically connected to the load circuit through the third power distribution circuit. The first port of the load circuit is electrically connected to the first port of the electric drive system. The second port of the electric drive system is electrically connected to the second port of the load circuit. The third port of the electric drive system is electrically connected to the first port of the boost relay. The second port of the boost relay is electrically connected to the fast charging positive switch or the fast charging negative switch.

[0006] According to one embodiment of the present invention, there is also provided a control method for a vehicle charging system. The vehicle charging system includes: a first power distribution circuit, a second power distribution circuit, a third power distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first power distribution circuit includes a first power battery pack, a second power battery pack, and a switch circuit. The switch circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the parallel connection of the first power battery pack and the second power battery pack is less than or equal to a first voltage threshold. The switch circuit is used to control the electrical connection form of the first power battery pack and the second power battery pack. The second power distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The second power distribution circuit is used to control the charging state of the vehicle charging system. The third power distribution circuit is used to control the conduction state between the first power distribution circuit and the load circuit. The working voltage of any load in the load circuit is greater than a preset voltage threshold. The electric drive system is used to drive the vehicle where the vehicle charging system is located. The DC charging socket is used to receive the direct current input from a charging pile outside the vehicle. The first voltage threshold is less than the preset voltage threshold. The control method for the vehicle charging system includes: obtaining a first working state of the second power distribution circuit, a second working state of the switch circuit, and a third working state of the third power distribution circuit; and supplying power to the load circuit based on the first working state, the second working state, and the third working state.

[0007] According to one embodiment of the present invention, there is also provided a control device for a vehicle charging system. The vehicle charging system includes: a first power distribution circuit, a second power distribution circuit, a third power distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first power distribution circuit includes a first power battery pack, a second power battery pack, and a switch circuit. The switch circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the parallel connection of the first power battery pack and the second power battery pack is less than or equal to a first voltage threshold. The switch circuit is used to control the electrical connection form of the first power battery pack and the second power battery pack. The second power distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The second power distribution circuit is used to control the charging state of the vehicle charging system. The third power distribution circuit is used to control the conduction state between the first power distribution circuit and the load circuit. The working voltage of any load in the load circuit is greater than a preset voltage threshold. The electric drive system is used to drive the vehicle where the vehicle charging system is located. The DC charging socket is used to receive the direct current input from a charging pile outside the vehicle. The first voltage threshold is less than the preset voltage threshold. The control device for the vehicle charging system includes: an obtaining module, configured to obtain a first working state of the second power distribution circuit, a second working state of the switch circuit, and a third working state of the third power distribution circuit; and a power supply module, configured to supply power to the load circuit based on the first working state, the second working state, and the third working state.

[0008] According to one embodiment of the present invention, there is also provided a vehicle, which is used to execute the control method of the vehicle charging system in any one of the above.

[0009] According to one embodiment of the present invention, there is also provided a computer-readable storage medium storing a computer program, wherein the computer program is configured to execute the control method of the vehicle charging system in any one of the above when running on a computer or a processor.

[0010] According to one embodiment of the present invention, there is also provided an electronic device including a memory and a processor, where the memory stores a computer program, and the processor is configured to run the computer program to execute the control method of the vehicle charging system in any one of the above.

[0011] According to one embodiment of the present invention, there is also provided a computer program product including a computer program, and the computer program implements the control method of the vehicle charging system in any one of the above when executed by a processor.

[0012] In the embodiment of the present invention, through the vehicle charging system, when the voltage of the power battery pack is small, the power battery system composed of the power battery pack and the boost relay can jointly output a higher voltage, thereby effectively charging the load circuit, improving the energy utilization rate of the whole vehicle, and there is no problem of the whole vehicle EMC radiation emission, and the overall cost is low. Furthermore, the technical problem of high cost caused by using a motor and a motor controller to perform high-power boost charging on a vehicle in the related art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0014] Figure 1 is a schematic structural diagram of a vehicle charging system according to one embodiment of the present invention;

[0015] Figure 2 is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0016] Figure 3 is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0017] Figure 4 is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0018] Figure 5 is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0019] Figure 6 is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0020] Figure 7 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0021] Figure 8 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0022] Figure 9 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0023] Figure 10 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0024] Figure 11 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0025] Figure 12 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0026] Figure 13 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0027] Figure 14 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0028] Figure 15 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0029] Figure 16 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0030] Figure 17 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0031] Figure 18 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0032] Figure 19 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0033] Figure 20 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0034] Figure 21 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention;

[0035] Figure 22 is a flowchart of a control method for a vehicle charging system according to an embodiment of the present invention;

[0036] Figure 23 is a block diagram of a control device for a vehicle charging system according to an embodiment of the present invention. Detailed implementation manners

[0037] For ease of understanding, some explanations of concepts related to the embodiments of the present invention are exemplarily given for reference.

[0038] As follows:

[0039] Intelligent fuse: An electrical device integrating a fuse and a circuit breaker. The intelligent fuse can automatically monitor the current and voltage in the circuit and automatically cut off the power supply when the circuit is overloaded or short-circuited, playing a role in protecting electrical equipment and personal safety.

[0040] Shunt: A circuit device used to shunt current to different electrical equipment. The shunt can distribute the current to different lines or devices as needed, thereby realizing the reasonable distribution and management of the circuit to ensure that each device can obtain the required current.

[0041] Protection switch: A switch device that can automatically cut off the power supply when a fault occurs in the circuit. The role of the protection switch is to protect the circuit and equipment from the influence of faults such as overload, short circuit, and leakage, ensure the safe operation of the circuit, and prevent dangerous events such as fires.

[0042] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here. In the description of this embodiment, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0044] According to an embodiment of the present invention, an embodiment of a control method for a vehicle charging system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0045] This method embodiment can be executed in an electronic device, a similar control device or system that includes a memory and a processor. Taking the electronic device as an example, the electronic device may include one or more processors and a memory for storing data. Optionally, the above-mentioned electronic device may further include a communication device for communication functions and a display device. Those of ordinary skill in the art can understand that the above structural description is only illustrative and does not limit the structure of the above-mentioned electronic device. For example, the electronic device may further include more or fewer components than the above structural description, or have a configuration different from the above structural description.

[0046] The processor may include one or more processing units. For example, the processor may include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural-network processing unit (NPU), a tensor processing unit (TPU), an artificial intelligent (AI) type processor, and other processing devices. Among them, different processing units may be independent components or integrated in one or more processors. In some instances, the electronic device may also include one or more processors.

[0047] The memory can be used to store computer programs. For example, it stores the computer program corresponding to the control method of the vehicle charging system in the embodiments of the present invention. The processor realizes the above-mentioned control method of the vehicle charging system by running the computer program stored in the memory. The memory may include a high-speed random access memory and may also include a non-volatile memory, such as one or more magnetic storage devices, a flash memory, or other non-volatile solid-state memories. In some instances, the memory may further include a memory remotely set relative to the processor, and these remote memories can be connected to the electronic device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and their combinations.

[0048] The communication device is used to receive or send data via a network. Specific examples of the above network may include the wireless network provided by the communication provider of the mobile terminal. In one instance, the communication device includes a network interface controller (NIC), which can be connected to other network devices through a base station and thus communicate with the Internet. In one instance, the communication device may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0049] The display device can be, for example, a touch-screen liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen"). The liquid crystal display enables a user to interact with the user interface of the mobile terminal. In some embodiments, the above-mentioned mobile terminal has a graphical user interface (GUI), and the user can perform human-computer interaction with the GUI through finger contacts and / or gestures on the touch-sensitive surface. The human-computer interaction function here optionally includes the following interactions: creating web pages, drawing, word processing, creating electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music, and / or web browsing, etc. The executable instructions for performing the above human-computer interaction functions are configured / stored in a computer program product or readable storage medium executable by one or more processors.

[0050] In this embodiment, a vehicle charging system is provided. Figure 1 It is a schematic structural diagram of a vehicle charging system according to an embodiment of the present invention. As Figure 1 shown, the vehicle charging system includes: the vehicle charging system includes: a first power distribution circuit, a second power distribution circuit, a third power distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first power distribution circuit includes a first power battery pack, a second power battery pack, and a switching circuit. The switching circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the parallel connection of the first power battery pack and the second power battery pack is less than or equal to a first voltage threshold. The switching circuit is used to control the electrical connection relationship between the first power battery pack and the second power battery pack. The second power distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The second power distribution circuit is used to control the charging state of the vehicle charging system. The third power distribution circuit is used to control the conduction state between the first power distribution circuit and the load circuit. The operating voltage of any load in the load circuit is greater than a preset voltage threshold. The electric drive system is used to drive the vehicle where the vehicle charging system is located. The DC charging socket is used to receive the direct current input from a charging pile outside the vehicle. The first voltage threshold is less than the preset voltage threshold.

[0051] Among them, the positive electrode of the first power battery pack is electrically connected to the first port of the fast charge positive switch, the second port of the fast charge positive switch is electrically connected to the positive electrode interface of the DC charging socket, the negative electrode of the first power battery pack is electrically connected to the first port of the series switch, the second port of the series switch is electrically connected to the positive electrode of the second power battery pack, the negative electrode of the second power battery pack is electrically connected to the negative electrode interface of the DC charging socket, the second port of the fast charge negative switch is electrically connected to the negative DC power interface of the charging pile, the first port of the parallel negative switch is electrically connected to the negative electrode of the first power battery pack, the second port of the parallel negative switch is for inputting negative DC power, the first port of the parallel positive switch is electrically connected to the positive electrode of the second power battery pack, the second port of the parallel positive switch is electrically connected to the first port of the fast charge positive switch, the first distribution circuit is electrically connected to the load circuit through the third distribution circuit, the first port of the load circuit is electrically connected to the first port of the electric drive system, the second port of the electric drive system is electrically connected to the second port of the load circuit, the third port of the electric drive system is electrically connected to the first port of the boost relay, and the second port of the boost relay is electrically connected to the fast charge positive switch or the fast charge negative switch.

[0052] In the embodiment of the present invention, the first distribution circuit is composed of a power battery system and a switch circuit. Among them, the first power battery pack and the second power battery pack together constitute the power battery system. The power battery system can be directly charged by a charging pile, or the series-parallel conversion of the electrical connection relationship between the first power battery pack and the second power battery pack can be performed through the switch circuit, that is, the switch circuit is used to control the first power battery pack and the second power battery pack to form a series or parallel form, so that the power battery system can be charged and stored by a low-platform voltage charging pile or a low-platform voltage rescue vehicle, which is not limited here.

[0053] The lowest parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to the first voltage threshold. It can be understood that the first power battery pack and the second power battery pack respectively have the lowest voltage and the highest voltage that can be provided. Therefore, the parallel voltage after the first power battery pack and the second power battery pack are connected in parallel also has the lowest parallel voltage and the highest parallel voltage, that is, the parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is within the range formed by the lowest parallel voltage and the highest parallel voltage. It should be noted that in the embodiment of the present invention, the lowest parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to the first voltage threshold, and the highest parallel voltage after the first power battery pack and the second power battery pack are connected in parallel can be greater than the first voltage threshold.

[0054] In an embodiment of the present invention, the minimum parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to a first voltage threshold, where the first voltage threshold can be set according to actual requirements. Optionally, the minimum parallel voltage after the first power battery pack and the second power battery pack are connected in parallel can be ensured to be less than or equal to the first voltage threshold by setting the number of lithium iron phosphate battery cells or ternary battery cells in the power battery pack, or the minimum parallel voltage after the first power battery pack and the second power battery pack are connected in parallel can be ensured to be less than or equal to the first voltage threshold by setting the voltage ranges of the first power battery pack and the second power battery pack, which is not limited herein.

[0055] The switching circuit is used to control the electrical connection relationship between the first power battery pack and the second power battery pack. It can be understood that the switching circuit can control the electrical connection relationship between the first power battery pack and the second power battery pack to be in series or in parallel. As Figure 1 shown, if the series switch in the switching circuit is closed and the parallel negative switch and the parallel positive switch are open, the first power battery pack and the second power battery pack are in series, and the voltage of the power battery system is the sum of the voltage of the first power battery pack and the voltage of the second power battery pack. If the series switch in the switching circuit is open and the parallel negative switch and the parallel positive switch are closed, the first power battery pack and the second power battery pack are in parallel, and the voltage of the power battery system is the voltage of the first power battery pack and also the voltage of the second power battery pack.

[0056] It can be understood that, in order to protect the circuit, the first distribution circuit may further include other circuit elements, such as protection resistors, relays, intelligent fuses, shunts, etc., which can be selected according to actual requirements and are not limited herein.

[0057] The third distribution circuit is used to control the conduction state between the first distribution circuit and the load circuit. It can be understood that the third distribution circuit is used to isolate the fast charging circuit and the load circuit. Exemplarily, Figure 1 shows a situation where the third distribution circuit includes an isolation positive switch and an isolation negative switch. The first distribution circuit is electrically connected to the load circuit through the isolation positive switch and the isolation negative switch, so as to control the conduction state between the first distribution circuit and the load circuit according to the conduction states of the isolation positive switch and the isolation negative switch.

[0058] It should be noted that, Figure 1 the third distribution circuit in

[0059] The load circuit may include multiple loads, such as load components like a direct current / direct current converter (DC / DC) and an air conditioning system (ACP), etc. Figure 1 It only records the case where the load circuit includes a DC / DC and an APC, and the DC / DC and the APC are in parallel, which is not limited here. In the embodiments of the present invention, the operating voltage of any load is greater than a preset voltage threshold, which can be understood as the load in the load circuit being a high-voltage load, that is, the load circuit is a high-voltage load circuit, that is, the load circuit connected to the high-voltage loop.

[0060] It should be noted that the first voltage threshold is less than the preset voltage threshold, which also means that when both the first power battery pack and the second power battery pack are in a low-voltage state, the lowest parallel voltage that can be provided after the first power battery pack and the second power battery pack are in parallel cannot support the normal operation of the load circuit, that is, it cannot supply power to the load circuit.

[0061] The electric drive system can be understood as the total assembly of the electric drive system of an electric vehicle. The electric drive system is used to convert electrical energy into mechanical energy to drive the vehicle to run, that is, to drive the vehicle where the vehicle charging system is located. The electric drive system may include a motor, a controller, a transmission system, and related cables and connectors, etc. Figure 1 It only records the case where the load circuit includes a capacitor, a three-phase AC motor, multiple three-phase inverters, and multiple diodes, which is not limited here. Figure 1 The three-phase inverter in it includes three half-bridges, that is, branch pairs. The three half-bridges respectively include a series circuit formed by an upper-side and a lower-side controllable semiconductor switch, and a diode is respectively connected in parallel to the upper-side and the lower-side controllable semiconductor switch.

[0062] The second power distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The second power distribution circuit is used to control the charging state of the vehicle charging system, that is, the second power distribution circuit is used to control the power supply state of the charging pile to the vehicle charging system. It can be understood that the second power distribution circuit is used to control the vehicle charging system to work in the DC charging mode, and can also control the vehicle charging system to work in the motor boost mode.

[0063] Among them, the boost relay is used to increase the voltage of the circuit, so as to output a higher voltage through the boost relay. The second port of the boost relay is electrically connected to the fast charge positive switch or the fast charge negative switch, and can include various forms: the second port of the boost relay is electrically connected to the first port of the fast charge positive switch, the second port of the boost relay is electrically connected to the second port of the fast charge positive switch, the second port of the boost relay is electrically connected to the first port of the fast charge negative switch, the second port of the boost relay is electrically connected to the second port of the fast charge negative switch. For exampleFigure 1 As shown Figure 1 Taking the electrical connection between the second port of the boost relay and the second port of the fast charge positive switch as an example, it can be seen that after the input current of the DC charging socket interface passes through the boost relay, the boost relay will increase the output voltage, so as to provide a higher voltage to the three-phase AC motor of the electric drive system.

[0064] It can be understood that when both the first power battery pack and the second power battery pack are in a state of relatively low voltage, that is, when the minimum parallel voltage provided by the parallel connection of the first power battery pack and the second power battery pack cannot support the normal operation of the load circuit, the boost relay can be used to boost the voltage and supply power to the load circuit.

[0065] The fast charge positive switch and the fast charge negative switch are used to control whether the charging pile supplies power to the vehicle charging system. As Figure 1 shown, when both the fast charge positive switch and the fast charge negative switch are closed, the vehicle charging system can receive direct current from the DC charging pile and charge. When both the fast charge positive switch and the fast charge negative switch are open, the vehicle charging system cannot receive direct current from the DC charging pile.

[0066] The DC charging socket is used to receive the direct current input from the charging pile outside the vehicle. The DC charging socket includes the positive interface of the DC charging socket and the negative interface of the DC charging socket. As Figure 1 shown, the second port of the fast charge positive switch is electrically connected to the positive interface of the DC charging socket, and the second port of the fast charge negative switch is electrically connected to the negative interface of the DC charging socket. There is no restriction here.

[0067] It should be noted that for the switching elements used in the vehicle charging system, such as the parallel negative switch, the parallel positive switch, the series switch, the fast charge positive switch and the fast charge negative switch, etc., switching elements such as mechanical switches, transistor switches, relays, integrated circuit switches, photoelectric switches, capacitive switches, etc. can be selected to achieve the switching control of the current. There is no restriction here.

[0068] It can be understood that when the first power battery pack and the second power battery pack can provide a relatively high voltage, that is, when the lowest parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is greater than the first voltage threshold, whether the electrical connection relationship between the first power battery pack and the second power battery pack is in series or in parallel, power can be supplied to the high-voltage load. However, when the first power battery pack and the second power battery pack can only provide a relatively low voltage, that is, when the lowest parallel voltage after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to the first voltage threshold, the output voltage can meet the working voltage range of the high-voltage load when the first power battery pack and the second power battery pack are connected in series, but the output voltage when the first power battery pack and the second power battery pack are connected in parallel cannot meet the working voltage range of the high-voltage load, resulting in the high-voltage load being unable to work.

[0069] Based on the above considerations, in the second power distribution circuit of the embodiment of the present invention, a boost relay is added, so that the input voltage of the DC charging interface can be boosted by the boost relay to provide a higher voltage to the load circuit (i.e., the high-voltage load), thereby meeting the working voltage range of the high-voltage load, and enabling the vehicle charging system to normally supply power to the high-voltage load when the first power battery pack and the second power battery pack can only provide a relatively low voltage.

[0070] It can be seen that for the vehicle charging system proposed in the embodiment of the present invention, when the voltage of the power battery pack is relatively low, that is, when the output voltage of the power battery system composed of the power battery pack is relatively low, it can supply power to the electric drive system and the load circuit through the boost relay when the power battery packs are connected in parallel, thereby effectively charging the load circuit, improving the energy utilization rate of the whole vehicle, and there is no problem of vehicle EMC radiation emission, and the overall cost is relatively low, thus solving the technical problem of high cost caused by using motors and motor controllers to perform high-power boost charging on vehicles in the related art.

[0071] Optionally, the third power distribution circuit includes at least one of the following: an isolation positive switch and an isolation negative switch. Wherein, the positive electrode of the first power battery pack is electrically connected to the third port of the load circuit through the isolation positive switch; or, the negative electrode of the second power battery pack is electrically connected to the fourth port of the load circuit through the isolation negative switch; or, the positive electrode of the first power battery pack is electrically connected to the third port of the load circuit through the isolation positive switch, and the negative electrode of the second power battery pack is electrically connected to the fourth port of the load circuit through the isolation negative switch.

[0072] In the embodiment of the present invention, the third power distribution circuit may include at least one of the isolation positive switch and the isolation negative switch. Figure 2 is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention, Figure 2 which is described by taking the third power distribution circuit only including the isolation positive switch as an example, Figure 2 in whichFigure 1 For the repeated circuit components and circuit structures in Figure 1 , refer to the description of Figure 2 , and details are not repeated here. As

[0073] Figure 3 Figure is a schematic diagram of the structure of another vehicle charging system according to an embodiment of the present invention. Figure 3 Taking the third power distribution circuit including only the isolation negative switch as an example for illustration, Figure 3 In Figure 1 For the repeated circuit components and circuit structures in Figure 1 , refer to the description of Figure 1 Note that the second port of the boost relay shown in Figure 3 is electrically connected to the second port of the fast charge positive switch, and the second port of the pressure relay shown in Figure 3 is electrically connected to the second port of the fast charge negative switch. As

[0074] An example where the third power distribution circuit includes both the isolation positive switch and the isolation negative switch is as Figure 1 shown. When the third power distribution circuit includes both the isolation positive switch and the isolation negative switch, the positive electrode of the first power battery pack is electrically connected to the first port of the load circuit through the isolation positive switch, and the negative electrode of the second power battery pack is electrically connected to the fourth port of the load circuit through the isolation negative switch.

[0075] It can be seen that Figure 1 the isolation positive switch in

[0076] Figure 4 is in parallel with the fast charge positive switch, and the isolation negative switch is in parallel with the fast charge negative switch. It can be understood that the isolation positive switch and the fast charge positive switch can also be in a series electrical connection relationship, and the isolation negative switch and the fast charge negative switch can also be in a series electrical connection relationship. Figure 4 Figure is a schematic diagram of the structure of another vehicle charging system according to an embodiment of the present invention. Figure 4 In Figure 1 Taking the third power distribution circuit including both the isolation positive switch and the isolation negative switch as an example for illustration, Figure 1 For the repeated circuit components and circuit structures in Figure 4As shown, when the third power distribution circuit includes both an isolation positive switch and an isolation negative switch, the positive electrode of the first power battery pack is electrically connected to the first port of the load circuit through the isolation positive switch, and the negative electrode of the second power battery pack is electrically connected to the fourth port of the load circuit through the isolation negative switch. Moreover, the isolation positive switch is in parallel with the fast charge positive switch, and the isolation negative switch is in series with the fast charge negative switch.

[0077] Figure 5 It is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention. Figure 5 Taking the case where the third power distribution circuit includes both an isolation positive switch and an isolation negative switch as an example for illustration. Figure 5 In Figure 1 For the circuit elements and circuit structures that are repeated in Figure 1 , refer to the description of Figure 5 and will not be elaborated here. As

[0078] It can be understood that the isolation positive switch and the isolation negative switch can also be selected from switch elements such as mechanical switches, transistor switches, relays, integrated circuit switches, optoelectronic switches, capacitive switches, etc. to achieve the on-off control of the current, which is not limited here.

[0079] Optionally, a pre-charge switch and a protection resistor are in parallel with the isolation positive switch, and / or the pre-charge switch and the protection resistor are in parallel with the isolation negative switch.

[0080] In the embodiment of the present invention, when the DC / DC has no reverse pre-charge function, a pre-charge circuit can be connected in parallel to the isolation positive switch. The pre-charge circuit can include a pre-charge switch and a protection resistor, so that the motor can be reversely pre-charged through the pre-charge circuit first when starting the electric vehicle, ensuring that the motor can rotate smoothly when starting, and thus guaranteeing the normal operation of the electric vehicle.

[0081] It can be understood that a pre-charge circuit can be connected in parallel to the isolation positive switch, or a pre-charge circuit can be connected in parallel to the isolation negative switch, or pre-charge circuits can be connected in parallel to the isolation positive switch and the isolation negative switch respectively at the same time, which is set according to actual needs and is not limited here. In the embodiment of the present invention, the case of connecting a pre-charge circuit in parallel to the isolation positive switch is taken as an example for illustration.

[0082] Figure 6 It is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention. Figure 6Taking the third power distribution circuit including an isolation positive switch and an isolation negative switch, and a pre-charge switch and a protection resistor being connected in parallel with the isolation positive switch as an example for illustration. Figure 6 In Figure 1 For the repeated circuit components and circuit structures in Figure 1 , refer to the description of Figure 6 and details will not be repeated here. As

[0083] shown, it can be seen that the pre-charge switch and the protection resistor are connected in parallel with the isolation positive switch, so as to ensure the normal operation of the electric vehicle through the pre-charge switch and the protection resistor connected in parallel with the isolation positive switch when the DC / DC has no reverse pre-charge function.

[0084] Optionally, the first power distribution circuit further includes at least one of the following: at least one intelligent fuse, at least one shunt, a positive protection switch, and a negative protection switch.

[0085] In the embodiments of the present invention, in order to protect the circuit and avoid damage to circuit components, circuit components such as intelligent fuses, shunts, and protection switches can also be added to the circuit.

[0086] Figure 7 , Figure 8 and Figure 9 are respectively schematic diagrams of the structures of another vehicle charging system according to one embodiment of the present invention. Figure 7 , Figure 8 and Figure 9 For the repeated circuit components and circuit structures in Figure 6 and Figure 6 , refer to the description of Figure 7 , Figure 8 and Figure 9 The first power distribution circuit in

[0087] includes an intelligent fuse and a shunt. It can be understood that the intelligent fuse and the shunt can be located at different positions in the first power distribution circuit to protect the first power distribution circuit. Figure 7 As Figure 7 shown,

[0088] As Figure 8 shown, Figure 8It shows a situation where the first intelligent fuse and the first shunt are connected in series with the first power battery pack, and both the first intelligent fuse and the first shunt are located on the positive circuit side of the first power battery pack. The second intelligent fuse and the second shunt are connected in series with the second power battery pack, and both the second intelligent fuse and the second shunt are located on the negative circuit side of the second power battery pack.

[0089] As Figure 9 shown, Figure 9 It shows a situation where the first intelligent fuse and the first shunt are connected in series with the first power battery pack, and both the first intelligent fuse and the first shunt are located on the negative circuit side of the first power battery pack. The second intelligent fuse and the second shunt are connected in series with the second power battery pack, and both the second intelligent fuse and the second shunt are located on the positive circuit side of the second power battery pack.

[0090] It can be understood that, as Figures 7 to 9 shown, when the first power battery pack and the second power battery pack are charged in series, for example, when charging at a high rate of 5C with a 1000V charging pile, the current in the series circuit is relatively large. Therefore, the shunt and the intelligent fuse in the series circuit need to be selected with a larger specification to take into account the high-rate charging ability.

[0091] Figure 10 is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention. Figure 10 In it, the Figure 6 repeated circuit elements and circuit structures are referred to the description of Figure 6 , and will not be elaborated here. It can be seen that Figure 10 the first distribution circuit in

[0092] It can be understood that, as Figure 10 shown, when the first power battery pack and the second power battery pack are charged in series, the second shunt and the second intelligent fuse are isolated outside the circuit, and there is no need to pass a high-rate charging current. Therefore, a smaller specification can be selected. When the first power battery pack and the second power battery pack are charged in parallel, for example, when charging with a 500V / 250A charging pile, the current in the parallel circuit is about 125A. Therefore, the second shunt and the second intelligent fuse can be selected with a smaller specification.

[0093] The above Figures 7 to 10 shows the situation where the first distribution circuit of the vehicle charging system includes an intelligent fuse and a shunt. In addition, the first distribution circuit may further include a protection switch. Figure 11 is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention.Figure 11 In Figure 9 For the repeated circuit components and circuit structures in Figure 9 , refer to the description of

[0094] As Figure 11 shown, Figure 11 In

[0095] It can be understood that the circuit structures in the embodiments of the present invention can be combined according to requirements. Figure 12 FIG. Figure 12 In Figure 9 For the repeated circuit components and circuit structures in Figure 9 , refer to the description of Figure 12 That is a possible combination method. As Figure 12 shown, the first power distribution circuit may only include a negative protection switch, and the third power distribution circuit may only include an isolation positive switch.

[0096] Figure 13 FIG. Figure 13 In Figure 9 For the repeated circuit components and circuit structures in Figure 9 , refer to the description of Figure 13 That is another possible combination method. As Figure 13 shown, the first power distribution circuit may only include a positive protection switch, and the third power distribution circuit may only include an isolation negative switch. It should be noted that Figure 13 the second port of the boost relay in

[0097] The above Figure 12 and Figure 13 illustrate two combination methods, and other combination methods can also be adopted according to requirements, which will not be elaborated here.

[0098] Optionally, the second power distribution circuit further includes: a voltage stabilizing capacitor.

[0099] In an embodiment of the present invention, a voltage stabilizing capacitor may be added at the boosting port of the boosting relay in the third power distribution circuit. Among them, the voltage stabilizing capacitor is used to provide stable voltage and current in the circuit, balance the voltage fluctuations in the circuit, ensure the stable operation of the circuit, and thereby protect other circuit elements in the circuit from the influence of voltage changes.

[0100] It can be understood that while adding a voltage stabilizing capacitor in the third power distribution circuit, a capacitor switch may also be provided to control whether to enable the voltage stabilizing capacitor, which is not limited herein.

[0101] Figure 14 It is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention. Figure 14 The circuit elements and circuit structures that are repeated in Figure 7 are referred to the description of Figure 7 here, and will not be elaborated herein. As Figure 14 shown, the third power distribution circuit includes a boosting relay, a fast charging positive switch, a fast charging negative switch, a voltage stabilizing capacitor, and a capacitor switch. Among them, the second port of the boosting relay is electrically connected to the first port of the capacitor switch through the voltage stabilizing capacitor, the second port of the capacitor switch is used to input negative direct current, and the second port of the fast charging negative switch is electrically connected to the negative direct current interface of the charging pile.

[0102] It should be noted that Figure 14 shows a form of multiplexing the circuit between the fast charging positive switch and the boosting relay. In addition, the voltage stabilizing capacitor and the capacitor switch may also be connected in parallel in series at the DC charging socket interface, which is not limited herein.

[0103] Optionally, there may also be the following several deformation forms in the vehicle charging system provided by the embodiment of the present invention, which are not limited herein.

[0104] Figure 15 It is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention. Figure 15 The circuit elements and circuit structures that are repeated in Figure 7 are referred to the description of Figure 7 here, and will not be elaborated herein. In the foregoing Figures 1 to 14 , when the first port of the boosting relay is electrically connected to the third port of the electric drive system, it is electrically connected to the three-phase midpoint of the three-phase AC motor of the electric drive system. As Figure 15 shown, Figure 15 shows the situation where the first port of the boosting relay is electrically connected to the three-phase winding bus of the three-phase AC motor, and the second port of the boosting relay is used to input positive direct current.

[0105] Figure 16 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention. Figure 16 For the circuit elements and circuit structures that are repeated in Figure 7 and Figure 7 , refer to the description of Figure 16 , and details are not described herein. It should be noted that

[0106] Figure 17 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention. Figure 17 For the circuit elements and circuit structures that are repeated in Figure 7 and Figure 7 , refer to the description of Figure 17 , and details are not described herein. It should be noted that

[0107] Figure 18 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention. Figure 18 For the circuit elements and circuit structures that are repeated in Figure 7 and Figure 7 , refer to the description of Figure 18 , and details are not described herein. It should be noted that the second port of the boost relay in

[0108] Figure 19 inputs positive DC power through the fast charging positive switch, that is, the second port of the boost relay is electrically connected to the first port of the fast charging positive switch. Figure 19 For the circuit elements and circuit structures that are repeated in Figure 7 and Figure 7 , refer to the description of Figure 19 , and details are not described herein. It should be noted that the second port of the boost relay in

[0109] Figure 20 It is a schematic structural diagram of another vehicle charging system according to one embodiment of the present invention. Figure 20 For the circuit elements and circuit structures that are repeated in Figure 8 and Figure 8 , refer to the description of Figure 20 , and details are not described herein. It should be noted that the isolation positive switch in

[0110] Figure 21 It is a schematic structural diagram of another vehicle charging system according to an embodiment of the present invention. Figure 21 For the Figure 9 circuit elements and circuit structures that are repeated in Figure 9 , please refer to the description of Figure 21 . They will not be elaborated here. It should be noted that

[0111] It can be understood that the circuit structures in the embodiments of the present invention can be combined according to requirements, which is not limited here.

[0112] In this embodiment, a control method for a vehicle charging system operating on an electronic device is provided. Figure 22 It is a flowchart of the control method for the vehicle charging system according to an embodiment of the present invention. As Figure 22 shown, the process includes the following steps:

[0113] Step S220: Obtain the first working state of the second distribution circuit, the second working state of the switch circuit, and the third working state of the third distribution circuit;

[0114] Step S221: Supply power to the load circuit based on the first working state, the second working state, and the third working state.

[0115] The vehicle charging system controlled by the control method of the vehicle charging system includes: a first distribution circuit, a second distribution circuit, a third distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first distribution circuit includes a first power battery pack, a second power battery pack, and a switch circuit. The switch circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the parallel connection of the first power battery pack and the second power battery pack is less than or equal to the first voltage threshold. The switch circuit is used to control the electrical connection relationship between the first power battery pack and the second power battery pack. The second distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The second distribution circuit is used to control the charging state of the vehicle charging system. The third distribution circuit is used to control the conduction state between the first distribution circuit and the load circuit. The working voltage of any load in the load circuit is greater than the preset voltage threshold. The electric drive system is used to drive the vehicle where the vehicle charging system is located. The DC charging socket is used to receive the direct current input from the charging pile outside the vehicle. The first voltage threshold is less than the preset voltage threshold. For the description of the vehicle charging system, please refer to the description of Figure 1 . It will not be elaborated here.

[0116] In the embodiment of the present invention, obtaining the first working state of the second distribution circuit, the second working state of the switching circuit, and the third working state of the third distribution circuit in the vehicle charging system can be understood as obtaining the conduction states of the boost relay, the fast charge positive switch, and the fast charge negative switch, obtaining the conduction states of the series switch, the parallel positive switch, and the parallel negative switch, and obtaining the conduction state between the first distribution circuit and the load circuit, so as to supply power to the load circuit according to the first working state, the second working state, and the third working state, that is, to supply power to the load circuit and the electric drive system.

[0117] It can be seen that when the voltage of each power battery pack in the vehicle charging system is small, when the first power battery pack and the second power battery pack are connected in series in the power battery system, a relatively high series voltage can be output, but when the first power battery pack and the second power battery pack are connected in parallel, the output parallel voltage is small and cannot supply power to the load circuit. Therefore, the boost relay is used to boost the voltage to charge the load circuit. Furthermore, by obtaining the first working state of the second distribution circuit, the second working state of the switching circuit, and the third working state of the third distribution circuit, and supplying power to the load circuit based on the first working state, the second working state, and the third working state, it is possible to effectively charge the high-voltage load circuit when the voltage of the power battery pack is low, improve the energy utilization rate of the whole vehicle, and there is no problem of vehicle EMC radiation emission, and the overall cost is low.

[0118] Through the above steps, by obtaining the first working state of the second distribution circuit, the second working state of the switching circuit, and the third working state of the third distribution circuit, and supplying power to the load circuit based on the first working state, the second working state, and the third working state, the purpose of outputting a relatively high voltage at low cost when the voltage of the power battery pack is low is achieved, so as to realize effectively charging the high-voltage load circuit when the voltage of the power battery pack is low, reduce the cost, and improve the energy utilization rate of the whole vehicle. Furthermore, the technical problem of high cost caused by using the motor and the motor controller to perform high-power boost charging on the vehicle in the related technology is solved.

[0119] Optionally, in step S221, supplying power to the load circuit based on the first working state, the second working state, and the third working state may include the following execution steps:

[0120] Step S221a, in response to determining that the boost relay, the fast charge positive switch, and the fast charge negative switch are all disconnected based on the first working state, determining that the series switch is closed, the parallel negative switch and the parallel positive switch are all disconnected based on the second working state, and determining that the first distribution circuit is conductive to the load circuit based on the third working state, controlling the vehicle charging system to enter the motor drive mode;

[0121] Step S221b: in the motor drive mode, controlling the first power battery pack and the second power battery pack to be connected in series to supply power to the load circuit.

[0122] In an embodiment of the present invention, when power is supplied to the load circuit based on the first working state, the second working state, and the third working state, if the boost relay, the fast charging positive switch, and the fast charging negative switch are all disconnected based on the first working state, the series switch is closed based on the second working state, the parallel negative switch and the parallel positive switch are both disconnected, and the first distribution circuit and the load circuit are connected based on the third working state, the vehicle charging system is controlled to enter the motor drive mode. In the motor drive mode, the first power battery pack and the second power battery pack are controlled to be connected in series to supply power to the load circuit, that is, the power battery system outputs a high voltage to supply power to the load circuit.

[0123] While supplying power to the load circuit, the electric drive system is also supplied. The three-phase inverter drives the three-phase AC motor according to the voltage output by the power battery system, so that the load circuit draws power directly from the power battery system.

[0124] Optionally, in step S221, supplying power to the load circuit based on the first working state, the second working state, and the third working state may include the following execution steps:

[0125] Step S221c, in response to determining that the boost relay is disconnected based on the first working state, the fast charging positive switch and the fast charging negative switch are both closed, determining that the series switch is closed based on the second working state, the parallel negative switch and the parallel positive switch are both disconnected, and determining that the first distribution circuit and the load circuit are conductive based on the third working state, controlling the vehicle charging system to enter the series DC charging mode;

[0126] Step S221d, in the series DC charging mode, control the DC power input by the charging pile to charge the first power battery pack and the second power battery pack, control the first power battery pack and the second power battery pack to be connected in series to supply power to the load circuit, and control the DC power flowing through the fast charging positive switch and the fast charging negative switch to supply power to the load circuit.

[0127] In an embodiment of the present invention, when powering the load circuit based on the first working state and the second working state, if it is determined based on the first working state that the boost relay is disconnected and both the fast charge positive switch and the fast charge negative switch are closed, that is, the second power distribution circuit works in the direct charge state, and it is determined based on the second working state that the series switch is closed and both the parallel negative switch and the parallel positive switch are disconnected, that is, the switch circuit works in the series state, and it is determined based on the third working state that the first power distribution circuit is conducted with the load circuit, then the vehicle charging system is controlled to enter the series DC charging mode. In the series DC charging mode, the DC power input from the charging pile is controlled to charge the first power battery pack and the second power battery pack until the first power battery pack and the second power battery pack are fully charged. At the same time, the first power battery pack and the second power battery pack are controlled to be connected in series to supply power to the load circuit, and the DC power flowing through the fast charge positive switch and the fast charge negative switch is controlled to supply power to the load circuit, that is, the DC power input from the charging pile is controlled to supply power to the load circuit.

[0128] While supplying power to the load circuit, power is also supplied to the electric drive system. The three-phase inverter drives the three-phase AC motor according to the voltage output by the power battery system and the voltage output by the charging pile, so that the load circuit directly draws power from the power battery system and the charging pile.

[0129] Optionally, before obtaining the first working state of the second power distribution circuit, the second working state of the switch circuit, and the third working state of the third power distribution circuit in step S220, the following execution steps may further be included:

[0130] Step S2201: Determine the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel;

[0131] Step S2202: In response to the parallel voltage value being less than or equal to the second voltage threshold, control the boost relay to close, where the second voltage threshold is greater than the first voltage threshold;

[0132] Step S2203: In response to the parallel voltage value being greater than the second voltage threshold, control the boost relay to disconnect.

[0133] In an embodiment of the present invention, the second voltage threshold may be within the range formed by the lowest parallel voltage and the highest parallel voltage of the parallel voltage after the first power battery pack and the second power battery pack are connected in parallel, and there is no limitation here. It should be noted that the second voltage threshold is greater than the first voltage threshold. Therefore, the conduction state of the boost relay can be controlled by determining the magnitude relationship between the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel and the second voltage threshold.

[0134] It can be understood that if the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is relatively large, that is, the parallel voltage value is greater than the second voltage threshold, the power battery system can directly supply power to the high-voltage load circuit. Therefore, there is no need to boost the voltage to supply power to the high-voltage load circuit through the boost relay, and thus the boost relay can be controlled to disconnect.

[0135] If the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is relatively small, that is, the parallel voltage value is less than or equal to the second voltage threshold, the voltage output by the power battery system cannot enable the high-voltage load circuit to work properly. Therefore, it is necessary to boost the voltage to supply power to the high-voltage load circuit through the boost relay, and thus the boost relay can be controlled to close.

[0136] Optionally, the third power distribution circuit includes an isolation positive switch and an isolation negative switch, and the boost relay is electrically connected to the fast charge positive switch. In step S221, supplying power to the load circuit based on the first working state, the second working state, and the third working state may include the following execution steps:

[0137] Step S221e: In response to determining that the boost relay, the fast charge positive switch, and the fast charge negative switch are all closed based on the first working state, determining that the series switch is open, the parallel negative switch and the parallel positive switch are both closed, and determining that the isolation positive switch is open and the isolation negative switch is closed based on the third working state, control the vehicle charging system to enter the first parallel DC charging mode;

[0138] Step S221f: In the first parallel DC charging mode, control the DC power input by the charging pile to charge the first power battery pack and the second power battery pack, and control the DC power flowing through the boost relay to supply power to the load circuit after being boosted by the electric drive system;

[0139] Step S221g: In response to the parallel voltage value being updated to be greater than the second voltage threshold, control the electric drive system to stop boosting, control the isolation positive switch to close, and control the boost relay to disconnect;

[0140] Step S221h: Control the DC power input by the charging pile to supply power to the first power battery pack and the second power battery pack, control the first power battery pack and the second power battery pack to be connected in parallel to supply power to the load circuit, and control the DC power flowing through the fast charge positive switch and the fast charge negative switch to supply power to the load circuit.

[0141] In an embodiment of the present invention, when the third power distribution circuit includes an isolation positive switch and an isolation negative switch, and the boost relay is electrically connected to the fast charge positive switch, if it is determined based on the first working state that the boost relay is closed, that is, the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to the second voltage threshold and the load circuit cannot be powered, and it is determined based on the first working state that both the fast charge positive switch and the fast charge negative switch are closed, that is, the second power distribution circuit operates in a direct charge and boost state, and it is determined based on the second working state that the series switch is disconnected and both the parallel negative switch and the parallel positive switch are closed, that is, the switch circuit operates in a parallel state, and it is determined based on the third working state that the isolation positive switch is disconnected and the isolation negative switch is closed, then the vehicle charging system is controlled to enter the first parallel DC charging mode. In the first parallel DC charging mode, the direct current input by the charging pile is controlled to charge the first power battery pack and the second power battery pack, and the direct current flowing through the boost relay is controlled to be boosted by the electric drive system and then supplied to the load circuit.

[0142] After controlling the direct current input by the charging pile to charge the first power battery pack and the second power battery pack, if the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is updated to be greater than the second voltage threshold, then the electric drive system is controlled to stop boosting, the isolation positive switch is controlled to be closed, and the boost relay is controlled to be disconnected. That is, after the parallel voltage value is updated to be greater than the second voltage threshold, the power battery system can supply power to the load circuit, so there is no need to use the boost relay to boost and supply power to the load circuit, and the boost relay can be disconnected.

[0143] After the boost relay is disconnected, the direct current input by the charging pile can continue to be controlled to supply power to the first power battery pack and the second power battery pack until the first power battery pack and the second power battery pack are fully charged. At the same time, the first power battery pack and the second power battery pack can be controlled to be connected in parallel to supply power to the load circuit, and the direct current flowing through the fast charge positive switch and the fast charge negative switch can be controlled to supply power to the load circuit.

[0144] It can be understood that when the isolation positive switch is controlled to be closed, if the DC / DC does not have a reverse pre-charge function, the pre-charge process can be carried out through the protection resistor and the pre-charge switch connected in parallel with the isolation positive switch to protect the circuit, which will not be elaborated here.

[0145] It can be understood that the inverter in the electric drive system and the stator winding can operate together as a booster (i.e., a boost circuit) to supply power to system components in a high working voltage range such as DC / DC and ACP. Among them, the power of DC / DC and ACP is small. For example, the power of DC / DC is 3kW. When using a 500V / 250A charging pile to charge the first power battery pack and the second power battery pack in parallel, the current in the boost relay circuit is about 12A. Therefore, the boost relay can be selected with a smaller specification, or an on-board device can be used to further save costs.

[0146] When the first power battery pack and the second power battery pack are charged in parallel, for example, when charging through a 500V / 250A charging pile, the current in the parallel circuit of the first power battery pack and the second power battery pack is about 125A. Therefore, the parallel positive switch and the parallel positive switch in the switching circuit can be selected with a smaller specification.

[0147] Optionally, the third power distribution circuit includes an isolation positive switch and an isolation negative switch. The boost relay is electrically connected to the fast charge negative switch. In step S221, supplying power to the load circuit based on the first working state, the second working state, and the third working state may include the following execution steps:

[0148] Step S221i: In response to determining that the boost relay, the fast charge positive switch, and the fast charge negative switch are all closed based on the first working state, determining that the series switch is open, the parallel negative switch and the parallel positive switch are all closed based on the second working state, and determining that the isolation positive switch is closed and the isolation negative switch is open based on the third working state, control the vehicle charging system to enter the second parallel DC charging mode;

[0149] Step S221j: In the second parallel DC charging mode, control the DC power input by the charging pile to charge the first power battery pack and the second power battery pack, and control the DC power flowing through the boost relay to be boosted by the electric drive system and then supplied to the load circuit;

[0150] Step S221k: In response to the parallel voltage value being updated to be greater than the second voltage threshold, control the electric drive system to stop boosting, control the isolation negative switch to close, and control the boost relay to open;

[0151] Step S221l: Control the DC power input by the charging pile to supply power to the first power battery pack and the second power battery pack, control the first power battery pack and the second power battery pack to supply power to the load circuit in parallel, and control the DC power flowing through the fast charge positive switch and the fast charge negative switch to supply power to the load circuit.

[0152] In an embodiment of the present invention, when the third power distribution circuit includes an isolation positive switch and an isolation negative switch, and the boost relay is electrically connected to the fast charge negative switch, if it is determined based on the first working state that the boost relay is closed, that is, the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is less than or equal to the second voltage threshold and the load circuit cannot be powered, and it is determined based on the first working state that both the fast charge positive switch and the fast charge negative switch are closed, that is, the second power distribution circuit operates in the direct charge and boost state, and it is determined based on the second working state that the series switch is disconnected and both the parallel negative switch and the parallel positive switch are closed, that is, the switch circuit operates in the parallel state, and it is determined based on the third working state that the isolation positive switch is closed and the isolation negative switch is disconnected, then the vehicle charging system is controlled to enter the second parallel DC charging mode. In the second parallel DC charging mode, the DC power input by the charging pile is controlled to charge the first power battery pack and the second power battery pack, and the DC power flowing through the boost relay is controlled to be boosted by the electric drive system and then supplied to the load circuit.

[0153] After controlling the DC power input by the charging pile to charge the first power battery pack and the second power battery pack, if the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is updated to be greater than the second voltage threshold, then the electric drive system is controlled to stop boosting, the isolation negative switch is controlled to close, and the boost relay is controlled to disconnect. That is, after the parallel voltage value is updated to be greater than the second voltage threshold, the power battery system can supply power to the load circuit, so there is no need to use the boost relay to boost the power supply to the load circuit, and the boost relay can be disconnected.

[0154] After the boost relay is disconnected, the DC power input by the charging pile can continue to be controlled to supply power to the first power battery pack and the second power battery pack until the first power battery pack and the second power battery pack are fully charged. At the same time, the first power battery pack and the second power battery pack can be controlled to supply power to the load circuit in parallel, and the DC power flowing through the fast charge positive switch and the fast charge negative switch can be controlled to supply power to the load circuit.

[0155] It can be understood that when controlling the isolation negative switch to close, if the DC / DC has no reverse pre-charge function, the pre-charge process can be carried out through the protection resistor and the pre-charge switch connected in parallel with the isolation negative switch to protect the circuit, which will not be elaborated here.

[0156] It should be noted that controlling the charging pile to supply power to the load circuit includes two power supply methods. A small part of the current of the charging pile will directly flow through the isolation positive switch to the load circuit to supply power to the load circuit, and most of the current of the charging pile will also be boosted by the boost relay and then supplied to the electric drive system and the load circuit.

[0157] Optionally, in step S221, supplying power to the load circuit based on the first working state, the second working state, and the third working state may include the following execution steps:

[0158] Step S221m, in response to determining that the boost relay is off, the fast charge positive switch and the fast charge negative switch are both on based on the first working state, determining that the series switch is off, the parallel negative switch and the parallel positive switch are both on based on the second working state, and determining that the first power distribution circuit is conducting with the load circuit based on the third working state, control the vehicle charging system to enter the third parallel DC charging mode;

[0159] Step S221n, in the third parallel DC charging mode, control the first power battery pack and the second power battery pack to supply power to the load circuit in parallel, and control the direct current flowing through the fast charge positive switch and the fast charge negative switch to supply power to the load circuit.

[0160] In the embodiment of the present invention, when supplying power to the load circuit based on the first working state and the second working state, if it is determined based on the first working state that the boost relay is off, that is, the parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel is greater than the second voltage threshold, the power battery system can supply power to the load circuit. It is determined based on the first working state that the fast charge positive switch and the fast charge negative switch are both on, that is, the second power distribution circuit is working in the direct charge and boost state, and it is determined based on the second working state that the series switch is off, the parallel negative switch and the parallel positive switch are both on, and at the same time it is determined based on the third working state that the first power distribution circuit is conducting with the load circuit, then control the vehicle charging system to enter the third parallel DC charging mode. In the third parallel DC charging mode, control the first power battery pack and the second power battery pack to supply power to the load circuit in parallel, and the charging pile to supply power to the load circuit, and at the same time, it can also make the charging pile charge the first power battery pack and the second power battery pack.

[0161] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0162] In this embodiment, a control device for a vehicle charging system is further provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0163] Figure 23 is a structural block diagram of a control device for a vehicle charging system according to an embodiment of the present invention. The vehicle charging system includes: a first power distribution circuit, a second power distribution circuit, a third power distribution circuit, a load circuit, an electric drive system, and a DC charging socket. The first power distribution circuit includes a first power battery pack, a second power battery pack, and a switch circuit. The switch circuit includes a parallel negative switch, a parallel positive switch, and a series switch. The minimum parallel voltage after the parallel connection of the first power battery pack and the second power battery pack is less than or equal to a first voltage threshold. The switch circuit is used to control the electrical connection form of the first power battery pack and the second power battery pack. The second power distribution circuit includes a boost relay, a fast charge positive switch, and a fast charge negative switch. The second power distribution circuit is used to control the charging state of the vehicle charging system. The third power distribution circuit is used to control the conduction state between the first power distribution circuit and the load circuit. The operating voltage of any load in the load circuit is greater than a preset voltage threshold. The electric drive system is used to drive the vehicle where the vehicle charging system is located. The DC charging socket is used to receive the direct current input from a charging pile outside the vehicle. The first voltage threshold is less than the preset voltage threshold. As Figure 23 shown, taking the control device 2300 of the vehicle charging system as an example, the device includes: an acquisition module 2301, configured to acquire a first operating state of the second power distribution circuit, a second operating state of the switch circuit, and a third operating state of the third power distribution circuit; a power supply module 2302, configured to supply power to the load circuit based on the first operating state, the second operating state, and the third operating state.

[0164] Optionally, the power supply module 2302 is further configured to respond to determining that the boost relay, the fast charge positive switch, and the fast charge negative switch are all disconnected based on the first operating state, determining that the series switch is closed, the parallel negative switch and the parallel positive switch are both disconnected based on the second operating state, and determining that the first power distribution circuit is conducting with the load circuit based on the third operating state, and control the vehicle charging system to enter the motor drive mode; in the motor drive mode, control the first power battery pack and the second power battery pack to be connected in series to supply power to the load circuit.

[0165] Optionally, the power supply module 2302 is also used to respond to the determination based on the first working state that the boost relay is disconnected, the fast charging positive switch and the fast charging negative switch are both closed, the determination based on the second working state that the series switch is closed, the parallel negative switch and the parallel positive switch are both disconnected, and the determination based on the third working state that the first distribution circuit and the load circuit are conductive, and control the vehicle charging system to enter the series DC charging mode; in the series DC charging mode, control the DC power input by the charging pile to charge the first power battery pack and the second power battery pack, control the first power battery pack and the second power battery pack to supply power to the load circuit in series, and control the DC power flowing through the fast charging positive switch and the fast charging negative switch to supply power to the load circuit.

[0166] Optionally, the device also includes: a determination module, used to determine the parallel voltage value after the first power battery group and the second power battery group are connected in parallel; in response to the parallel voltage value being less than or equal to a second voltage threshold, controlling the boost relay to close, wherein the second voltage threshold is greater than the first voltage threshold; or, in response to the parallel voltage value being greater than the second voltage threshold, controlling the boost relay to open.

[0167] Optionally, the third distribution circuit includes an isolated positive switch and an isolated negative switch, and the boost relay is electrically connected to the fast charging positive switch. The power supply module 2302 is also used to respond to the boost relay, the fast charging positive switch and the fast charging negative switch being closed based on the first working state, the series switch being disconnected and the parallel negative switch and the parallel positive switch being closed based on the second working state, and the isolated positive switch being disconnected and the isolated negative switch being closed based on the third working state, to control the vehicle charging system to enter the first parallel DC charging mode; in the first parallel DC charging mode, control the input of the charging pile Direct current is used to charge the first power battery pack and the second power battery pack, and the direct current flowing through the boost relay is controlled to supply power to the load circuit after being boosted by the electric drive system; in response to the parallel voltage value being updated to be greater than the second voltage threshold, the electric drive system is controlled to stop boosting, the isolation positive switch is controlled to be closed, and the boost relay is controlled to be disconnected; the direct current input from the charging pile is controlled to supply power to the first power battery pack and the second power battery pack, the first power battery pack and the second power battery pack are controlled to supply power to the load circuit in parallel, and the direct current flowing through the fast charging positive switch and the fast charging negative switch is controlled to supply power to the load circuit.

[0168] Optionally, the third distribution circuit includes an isolated positive switch and an isolated negative switch, and the boost relay is electrically connected to the fast charging negative switch. The power supply module 2302 is also used to respond to the boost relay, the fast charging positive switch and the fast charging negative switch being all closed based on the first working state, the series switch being disconnected and the parallel negative switch and the parallel positive switch being closed based on the second working state, and the isolated positive switch being closed and the isolated negative switch being disconnected based on the third working state, to control the vehicle charging system to enter the second parallel DC charging mode; in the second parallel DC charging mode, control the DC power input by the charging pile to charge the first power battery pack and the second power battery pack, and control the DC power flowing through the boost relay. The DC power of the pressure relay is boosted by the electric drive system and then supplied to the load circuit to control the first power battery pack and the second power battery pack to be connected in parallel to supply power to the load circuit, and the DC power flowing through the fast charging positive switch and the fast charging negative switch is controlled to supply power to the load circuit; in response to the parallel voltage value being updated to be greater than the second voltage threshold, the electric drive system is controlled to stop boosting, the isolation negative switch is controlled to be closed, and the boost relay is controlled to be disconnected; the DC power input from the charging pile is controlled to supply power to the first power battery pack and the second power battery pack, the first power battery pack and the second power battery pack are controlled to be connected in parallel to supply power to the load circuit, and the DC power flowing through the fast charging positive switch and the fast charging negative switch is controlled to supply power to the load circuit.

[0169] Optionally, the power supply module 2302 is also used to respond to the determination based on the first working state that the boost relay is disconnected, the fast charging positive switch and the fast charging negative switch are both closed, the determination based on the second working state that the series switch is disconnected, the parallel negative switch and the parallel positive switch are both closed, and the determination based on the third working state that the first distribution circuit and the load circuit are conductive, and control the vehicle charging system to enter a third parallel DC charging mode; in the third parallel DC charging mode, control the first power battery pack and the second power battery pack to supply power to the load circuit in parallel, and control the DC power flowing through the fast charging positive switch and the fast charging negative switch to supply power to the load circuit.

[0170] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0171] An embodiment of the present invention further provides a vehicle, which is used to execute the steps in any of the above method embodiments.

[0172] An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored. The computer program is configured to execute the steps of any of the above method embodiments when running on a computer or a processor.

[0173] Optionally, in this embodiment, the above computer-readable storage medium may be configured to store a computer program for performing the following steps:

[0174] Step S220, obtain the first working state of the second power distribution circuit, the second working state of the switching circuit, and the third working state of the third power distribution circuit;

[0175] Step S221, supply power to the load circuit based on the first working state, the second working state, and the third working state.

[0176] Optionally, in this embodiment, the above computer-readable storage medium may include, but is not limited to: various media such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs that can store computer programs.

[0177] An embodiment of the present invention further provides an electronic device, including a memory and a processor. A computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0178] Optionally, in this embodiment, the processor in the above electronic device may be configured to run a computer program to execute the following steps:

[0179] Step S220, obtain the first working state of the second power distribution circuit, the second working state of the switching circuit, and the third working state of the third power distribution circuit;

[0180] Step S221, supply power to the load circuit based on the first working state, the second working state, and the third working state.

[0181] An embodiment of the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps in any one of the above method embodiments.

[0182] Optionally, in this embodiment, the computer program in the above computer program product, when executed by a processor, may be configured to execute the following steps:

[0183] Step S220, obtain the first working state of the second power distribution circuit, the second working state of the switching circuit, and the third working state of the third power distribution circuit;

[0184] Step S221, supply power to the load circuit based on the first working state, the second working state, and the third working state.

[0185] Optionally, for specific examples in this embodiment, reference may be made to the examples described in the above embodiments and alternative embodiments, and details thereof will not be repeated here.

[0186] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0187] In the above embodiments of the present invention, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0188] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed electrical connections or direct electrical connections or communication connections to each other can be through some interfaces, and the indirect electrical connections or communication connections of the units or modules can be in electrical or other forms.

[0189] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0190] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0191] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, read-only memory (ROM), random access memory (RAM), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0192] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A vehicle charging system, characterized in that: The vehicle charging system comprises: a first distribution circuit, a second distribution circuit, a third distribution circuit, a load circuit, an electric drive system and a DC charging seat, the first distribution circuit comprises a first power battery pack, a second power battery pack and a switch circuit, the switch circuit comprises a parallel negative switch, a parallel positive switch and a series switch, the lowest parallel voltage of the first power battery pack and the second power battery pack after being connected in parallel is less than or equal to a first voltage threshold, the switch circuit is used to control the electrical connection relationship between the first power battery pack and the second power battery pack, the second distribution circuit comprises a boost relay, a fast charging positive switch and a fast charging negative switch, the second distribution circuit is used to control the charging state of the vehicle charging system, the third distribution circuit is used to control the conduction state between the first distribution circuit and the load circuit, the working voltage of any load in the load circuit is greater than a preset voltage threshold, the electric drive system is used to drive the vehicle where the vehicle charging system is located, the DC charging seat is used to receive direct current input from the charging pile outside the vehicle, and the first voltage threshold is less than the preset voltage threshold; The positive electrode of the first power battery pack is electrically connected to the first port of the fast-charging positive switch, the second port of the fast-charging positive switch is electrically connected to the positive electrode interface of the DC charging station, the negative electrode of the first power battery pack is electrically connected to the first port of the series switch, the second port of the series switch is electrically connected to the positive electrode of the second power battery pack, the negative electrode of the second power battery pack is electrically connected to the first port of the fast-charging negative switch, and the second port of the fast-charging negative switch is electrically connected to the negative electrode interface of the DC charging station; The first port of the parallel negative switch is electrically connected to the negative electrode of the first power battery pack, the second port of the parallel negative switch is electrically connected to the first port of the fast-charging negative switch, the first port of the parallel positive switch is electrically connected to the positive electrode of the second power battery pack, and the second port of the parallel positive switch is electrically connected to the first port of the fast-charging positive switch; The first distribution circuit is electrically connected to the load circuit through the third distribution circuit, the first port of the load circuit is electrically connected to the first port of the electric drive system, the second port of the electric drive system is electrically connected to the second port of the load circuit, the third port of the electric drive system is electrically connected to the first port of the boost relay, and the second port of the boost relay is electrically connected to the fast charging positive switch or the fast charging negative switch.

2. The system according to claim 1, characterized in that The third distribution circuit includes at least one of the following: an isolated positive switch, an isolated negative switch; The positive electrode of the first power battery pack is electrically connected to the third port of the load circuit through the isolated positive electrode switch; or, The negative electrode of the second power battery pack is electrically connected to the fourth port of the load circuit through the isolated negative electrode switch; or, The positive electrode of the first power battery pack is electrically connected to the third port of the load circuit through the isolated positive electrode switch, and the negative electrode of the second power battery pack is electrically connected to the fourth port of the load circuit through the isolated negative electrode switch.

3. The system according to claim 2, characterized in that The isolated positive switch is connected in parallel with a pre-charging switch and a protective resistor, and / or the isolated negative switch is connected in parallel with the pre-charging switch and the protective resistor.

4. The system according to any one of claims 1 to 3, characterized in that: The first distribution circuit also includes at least one of the following: at least one intelligent fuse, at least one shunt, a positive protection switch and a negative protection switch; the second distribution circuit also includes: a voltage stabilizing capacitor.

5. A control method for a vehicle charging system, characterized in that: The control method of the vehicle charging system is applied to a vehicle charging system, the vehicle charging system being the vehicle charging system described in any one of claims 1 to 4, and the control method of the vehicle charging system comprising: Acquire a first working state of the second distribution circuit, a second working state of the switch circuit, and a third working state of the third distribution circuit; Power is supplied to the load circuit based on the first operating state, the second operating state, and the third operating state.

6. The method according to claim 5, characterized in that The supplying power to the load circuit based on the first working state, the second working state and the third working state comprises: In response to determining that the boost relay, the fast-charging positive switch, and the fast-charging negative switch are all disconnected based on the first working state, determining that the series switch is closed, the parallel negative switch and the parallel positive switch are both disconnected based on the second working state, and determining that the first distribution circuit and the load circuit are conductive based on the third working state, controlling the vehicle charging system to enter a motor drive mode; In the motor driving mode, the first power battery pack and the second power battery pack are controlled to be connected in series to supply power to the load circuit.

7. The method according to claim 5, characterized in that The supplying power to the load circuit based on the first working state, the second working state and the third working state comprises: In response to determining that the boost relay is disconnected based on the first working state, the fast charging positive switch and the fast charging negative switch are both closed, determining that the series switch is closed based on the second working state, the parallel negative switch and the parallel positive switch are both disconnected, and determining that the first distribution circuit and the load circuit are conductive based on the third working state, controlling the vehicle charging system to enter a series DC charging mode; In the series DC charging mode, the DC power input by the charging pile is controlled to charge the first power battery group and the second power battery group, the first power battery group and the second power battery group are controlled to be connected in series to supply power to the load circuit, and the DC power flowing through the fast charging positive switch and the fast charging negative switch is controlled to supply power to the load circuit.

8. The method according to claim 5, characterized in that Before acquiring the first working state of the second distribution circuit, the second working state of the switch circuit, and the third working state of the third distribution circuit, the method further includes: Determining a parallel voltage value after the first power battery pack and the second power battery pack are connected in parallel; In response to the parallel voltage value being less than or equal to a second voltage threshold, controlling the boost relay to close, wherein the second voltage threshold is greater than the first voltage threshold; or, In response to the parallel voltage value being greater than the second voltage threshold, the boost relay is controlled to be disconnected.

9. The method according to claim 8, characterized in that The third power distribution circuit includes an isolated positive switch and an isolated negative switch, the boost relay is electrically connected to the fast charging positive switch, and the power supply to the load circuit based on the first working state, the second working state and the third working state includes: In response to determining that the boost relay, the fast-charging positive switch, and the fast-charging negative switch are all closed based on the first working state, determining that the series switch is open, the parallel negative switch and the parallel positive switch are both closed based on the second working state, and determining that the isolated positive switch is open and the isolated negative switch is closed based on the third working state, controlling the vehicle charging system to enter a first parallel DC charging mode; In the first parallel DC charging mode, the DC power input by the charging pile is controlled to charge the first power battery pack and the second power battery pack, and the DC power flowing through the boost relay is controlled to supply power to the load circuit after being boosted by the electric drive system; In response to the parallel voltage value being updated to be greater than the second voltage threshold, controlling the electric drive system to stop boosting, controlling the isolated positive switch to close, and controlling the boost relay to disconnect; Control the direct current input by the charging pile to supply power to the first power battery pack and the second power battery pack, control the first power battery pack and the second power battery pack to supply power to the load circuit in parallel, and control the direct current flowing through the fast charging positive switch and the fast charging negative switch to supply power to the load circuit.

10. The method according to claim 8, characterized in that The third power distribution circuit includes an isolated positive switch and an isolated negative switch, the boost relay is electrically connected to the fast charging negative switch, and the power supply to the load circuit based on the first working state, the second working state and the third working state includes: In response to determining that the boost relay, the fast-charging positive switch, and the fast-charging negative switch are all closed based on the first working state, determining that the series switch is open, the parallel negative switch and the parallel positive switch are both closed based on the second working state, and determining that the isolated positive switch is closed and the isolated negative switch is open based on the third working state, controlling the vehicle charging system to enter a second parallel DC charging mode; In the second parallel DC charging mode, the DC power input by the charging pile is controlled to charge the first power battery pack and the second power battery pack, and the DC power flowing through the boost relay is controlled to supply power to the load circuit after being boosted by the electric drive system; In response to the parallel voltage value being updated to be greater than the second voltage threshold, controlling the electric drive system to stop boosting, controlling the isolated negative pole switch to close, and controlling the boost relay to disconnect; Control the direct current input by the charging pile to supply power to the first power battery pack and the second power battery pack, control the first power battery pack and the second power battery pack to supply power to the load circuit in parallel, and control the direct current flowing through the fast charging positive switch and the fast charging negative switch to supply power to the load circuit.

11. The method according to claim 8, characterized in that The supplying power to the load circuit based on the first working state, the second working state and the third working state comprises: In response to determining that the boost relay is disconnected and the fast-charging positive switch and the fast-charging negative switch are both closed based on the first working state, determining that the series switch is disconnected and the parallel negative switch and the parallel positive switch are both closed based on the second working state, and determining that the first distribution circuit and the load circuit are conductive based on the third working state, controlling the vehicle charging system to enter a third parallel DC charging mode; In the third parallel DC charging mode, the first power battery pack and the second power battery pack are controlled to supply power to the load circuit in parallel, and the DC power flowing through the fast charging positive switch and the fast charging negative switch is controlled to supply power to the load circuit.

12. A control device for a vehicle charging system, characterized in that: The control device of the vehicle charging system is applied to the vehicle charging system, and the vehicle charging system is the vehicle charging system described in any one of claims 1 to 4 above, and the control device of the vehicle charging system comprises: an acquisition module, configured to acquire a first working state of the second distribution circuit, a second working state of the switch circuit, and a third working state of the third distribution circuit; A power supply module is used to supply power to the load circuit based on the first working state, the second working state and the third working state.

13. A vehicle, characterized in that: The vehicle is used to execute the control method of the vehicle charging system described in any one of claims 5 to 11.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program is configured to execute the vehicle charging system control method described in any one of claims 5 to 11 when running on a computer or a processor.

15. An electronic device comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to run the computer program to execute the control method of the vehicle charging system as claimed in any one of claims 5 to 11.

16. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the control method of the vehicle charging system as claimed in any one of claims 5 to 11.

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