Power distribution device and charging system

Abstract

The utility model discloses a power distribution device and a charging system, and the device comprises at least two power conversion devices which comprise a plurality of power units; any power unit in the same power conversion device is connected with other one or more power units through a controllable switch. In the two different power conversion devices, at least one power unit in one power conversion device is connected with the power unit in the other power conversion device through a controllable switch. According to the invention, the technical problem of how to realize flexible distribution of each power unit while ensuring the minimum usage amount of the controllable switch during expansion of the super-power distribution device can be solved.

Description

Technical Field

[0001] This application relates to the field of power supply technology for new energy vehicles, and in particular to a power distribution device and a charging system. Background Technology

[0002] Currently, with the popularization of new energy vehicles and the application of renewable energy, the layout and optimization of power distribution devices and charging systems have become increasingly important. They help improve the convenience of electric transportation, promote green travel, and drive a sustainable transportation ecosystem.

[0003] When designing power distribution devices and charging systems, the increasing number of new energy vehicles necessitates a high-power expansion of the power distribution device. However, there is a conflict between expanding the power distribution device to a high power level while maintaining compatibility with the minimum number of controllable switches and allowing for more flexible allocation of power among the units within the power distribution device.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0005] The main objective of this application is to provide a power distribution device and a charging system, which aims to solve the technical problem that when expanding a power distribution device with ultra-high power, it is impossible to achieve flexible allocation of each power unit while ensuring the minimum number of controllable switches used.

[0006] To achieve the above objectives, this application provides a power distribution device, comprising: at least two power conversion devices, each power conversion device including a plurality of power units; wherein any power unit in the same power conversion device is connected to one or more other power units via a controllable switch; in two different power conversion devices, at least one power unit in one power conversion device is connected to a power unit in the other power conversion device via a controllable switch.

[0007] Optionally, there are two power conversion devices, and the two power conversion devices have the same topology.

[0008] Optionally, the two power conversion devices include a first power conversion device and a second power conversion device; wherein, two power units in the first power conversion device and two power units in the second power conversion device are connected to each other via the controllable switch.

[0009] Optionally, in the same power conversion device, any one of the power units is connected to three other power units via a controllable switch.

[0010] Optionally, both the first power conversion device and the second power conversion device include twelve power units, and the twelve power units respectively form a fully enclosed ring path, an inner ring path, and an outer ring path; wherein, the first power unit, the second power unit, the third power unit, the fourth power unit, the fifth power unit, the twelfth power unit, the eleventh power unit, the tenth power unit, the ninth power unit, and the eighth power unit are sequentially connected by a controllable switch to form the fully enclosed ring path; the sixth power unit is connected to the second power unit and the fifth power unit by a controllable switch to form a first sub-path, and the seventh power unit is connected to the sixth power unit, the eighth power unit, and the eleventh power unit by a controllable switch to form a second sub-path, the first sub-path and the second sub-path constitute the inner ring path; the first power unit is connected to the tenth power unit by a controllable switch, the third power unit is connected to the twelfth power unit by a controllable switch, and the fourth power unit is connected to the ninth power unit by a controllable switch to form the outer ring path.

[0011] Optionally, the fifth power unit in the first power conversion device is connected to the eighth power unit in the second power conversion device via a controllable switch, and the eighth power unit in the first power conversion device is connected to the fifth power unit in the second power conversion device via a controllable switch.

[0012] Optionally, both power conversion devices include multiple charging gun connection interfaces for connecting charging guns, and the number of charging guns is less than or equal to the number of power units.

[0013] Optionally, the power unit is an AC-DC conversion unit used to convert AC power into DC power and output DC power.

[0014] Optionally, the controllable switch includes at least one of a contactor, a relay, and / or a solid-state switch.

[0015] In addition, to achieve the above objectives, this application also provides a charging system, including the power distribution device, controller, and charging terminal, wherein the controller and the controllable switch are communicatively connected.

[0016] This application proposes a power distribution device and charging system. By connecting at least one power unit in one of two adjacent power conversion devices to a power unit in the other power conversion device via a controllable switch, it solves the technical problem of how to achieve flexible allocation of power units while ensuring a minimum number of controllable switches when expanding ultra-high power distribution devices. It achieves the goal of connecting two power conversion devices with only a minimum of one additional controllable switch, and allowing the use of any power unit from either power conversion device when the controllable switch is closed. This makes it suitable for ultra-high power distribution devices. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a first structure of a power distribution device provided in an embodiment of this application;

[0018] Figure 2 This is a second structural schematic diagram of a power distribution device provided in an embodiment of this application;

[0019] Figure 3 This is a third structural schematic diagram of a power distribution device provided in an embodiment of this application.

[0020] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0024] In the existing technology, due to the increase in the number of new energy vehicles, there is a need to expand the power distribution device to a higher power. However, when expanding the power distribution device to a higher power, there is a conflict between being compatible with the use of the minimum number of controllable switches and being able to allocate power to each unit in the power distribution device more flexibly.

[0025] To address the aforementioned problems, this application provides a power distribution device and a charging system, the details of which are described below.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a first structure of a power distribution device provided in an embodiment of this application. The power distribution device may include: at least two power conversion devices, each power conversion device including a plurality of power units 10; wherein any power unit 10 in the same power conversion device is connected to one or more other power units 10 through a controllable switch K; in two different power conversion devices, at least one power unit 10 in one power conversion device is connected to a power unit 10 in the other power conversion device through a controllable switch K.

[0027] Each power unit 10 can be an AC-DC (Alternating Current / Direct Current) converter, capable of converting AC power into DC power and outputting DC power. The input terminal of power unit 10 is electrically connected to 380V AC mains, and the output terminal of power unit 10 is electrically connected to other power units 10 to achieve cascading (series or parallel connection) with other power units 10.

[0028] The control terminal of the controllable switch K is connected to the control module to turn on or off in response to the switch control signal output by the control module. This allows for flexible adjustment of different power units by controlling each controllable switch K. For example, the controllable switch can be at least one of a contactor, relay, and / or solid-state switch.

[0029] In this exemplary embodiment, the power unit 10 can convert the high-voltage AC power from the power grid into the low-voltage DC power required by new energy vehicles, perform signal processing to monitor the charging status, and support communication with the management system to achieve intelligent charging. The controllable switch K can safely switch high-power current under low-power signal conditions, and can thus be used to control the on / off state of the circuit, realizing the transition between charging, standby, and power-off modes. This achieves automated management of the charging process, ensuring stable operation of the power distribution device and charging system under different operating conditions, and protecting the safety of users and equipment. It is understood that the controllable switch K can be in a closed or open state.

[0030] It should be further explained that, between the two power conversion devices, at least one power unit in one power conversion device is connected to a power unit in the other power conversion device via a controllable switch. This solves the problem of flexibly allocating power units while ensuring a minimum number of controllable switches are used when expanding a high-power distribution device. It achieves the goal of connecting two power conversion devices with only a minimum of one additional controllable switch. When the controllable switch is closed, any power unit from either power conversion device can be used, making it suitable for high-power distribution devices.

[0031] It should be understood that Figure 1 As an example only, this application does not impose specific limitations on the number of power conversion devices, the number of power units, and the number of controllable switches in this embodiment.

[0032] The working principle and results of the power distribution device provided in this application will be further explained below with reference to the accompanying drawings.

[0033] In an exemplary embodiment, please refer to Figure 2 , Figure 2 This is a second structural schematic diagram of a power distribution device provided in an embodiment of this application. The power distribution device includes two power conversion devices, and the two power conversion devices have the same topology. It should be noted that the two power conversion devices having the same topology means that the number of power units and the connection relationship of the power units in the two power conversion devices are the same.

[0034] The two power conversion devices can be a first power conversion device 100 and a second power conversion device 200. Both the first power conversion device 100 and the second power conversion device 200 contain 12 identical power units, and the connection method of each power unit to the other power units is the same in both the first power conversion device 100 and the second power conversion device 200.

[0035] For example, with Figure 2 Taking the first power conversion device 100 as an example, the first power conversion device 100 includes 12 power units, namely: power unit 1, power unit 2, ..., power unit 12. Since the first power conversion device 100 and the second power conversion device 200 have the same topology, then in... Figure 2 The same reference numerals are used to denote the same power unit in the first power conversion device 100 and the second power conversion device 200.

[0036] Taking power unit 2 in the first power conversion device 100 and power unit 2 in the second power conversion device 200 as examples, the topology of the first power conversion device 100 and the second power conversion device 200 are the same. In the first power conversion device 100, power unit 2, power unit 1, power unit 6 and power unit 3 are all connected through a controllable switch K. In the second power conversion device 200, power unit 2, power unit 1, power unit 6 and power unit 3 are also connected through a controllable switch K. Figure 2 The diagram shows a partial connection of power units in each power conversion device. Of course, in other embodiments, each power unit in each power conversion device may have other connection methods. For example, by increasing the number of controllable switches K, more connection paths can be established to further increase the flexibility of calling power units.

[0037] Please continue to refer to this. Figure 2 The first power conversion device 100 and the second power conversion device 200 are interconnected by a controllable switch K. For example, the power unit 8 in the first power conversion device 100 and the power unit 5 in the second power conversion device 200 are connected by a controllable switch K.

[0038] It should be understood that Figure 2 This is merely an example; the specific connection methods between each power unit and other power units in the power conversion device can be adjusted according to actual needs, and this application does not impose any specific restrictions on this.

[0039] In an exemplary embodiment, the power distribution device may further include two power conversion devices, and the two power conversion devices have the same topology. The two power conversion devices may be a first power conversion device 100 and a second power conversion device 200. Two power units in the first power conversion device 100 and two power units in the second power conversion device 200 are connected to each other via a controllable switch.

[0040] In this device, any one of the two power units in the first power conversion device 100 can be connected to any one of the two power units in the second power conversion device 200 via a controllable switch, and the other power unit in the first power conversion device 100 can be connected to the other power unit in the second power conversion device 200 via a controllable switch.

[0041] Understandably, for power distribution devices requiring ultra-high power, directly connecting all power units in pairs via controllable switches would require a large number of controllable switches. This increases the complexity of the power distribution device, raises the cost and design difficulty, and increases the probability of failure. Additionally, controllable switches introduce a certain delay during operation, and the combined operation of many controllable switches may lead to a longer response time, thus affecting charging efficiency. In this embodiment, by adding two sets of controllable switches and several wires, two identical power conversion devices can be interconnected by adding only two controllable switches. This achieves compatibility with the minimum number of controllable switches required while ensuring flexible allocation of power units in the two power conversion devices.

[0042] In an exemplary embodiment, please refer to Figure 3 , Figure 3 This is a schematic diagram of a third structure of a power distribution device provided in an embodiment of this application. The power distribution device may further include two power conversion devices, and the two power conversion devices have the same topology. The two power conversion devices may be a first power conversion device 100 and a second power conversion device 200. Both the first power conversion device and the second power conversion device include twelve power units. In the same power conversion device, any power unit is connected to three other power units through a controllable switch.

[0043] like Figure 3As shown, taking the first power conversion device 100 as an example, the first power conversion device 100 includes 12 power units, namely: first power unit 1, second power unit 2, ..., twelfth power unit 12. The first power unit 1 to the twelfth power unit 12 are cascaded through controllable switches KM1 to KM18. The first power unit 1 is also connected to the eighth power unit 8 and the tenth power unit 10. The second power unit 2 is also connected to the sixth power unit 6. The third power unit 3 and the fifth power unit 5 are also connected to the twelfth power unit 12. The fourth power unit 4 is also connected to the ninth power unit 9. The seventh power unit 7 is also connected to the eleventh power unit 11.

[0044] For example, the twelve power units in the first power conversion device 100 respectively form a fully enclosed ring path, an inner ring path, and an outer ring path; wherein, the first power unit 1, the second power unit 2, the third power unit 3, the fourth power unit 4, the fifth power unit 5, the twelfth power unit 12, the eleventh power unit 11, the tenth power unit 10, the ninth power unit 9, and the eighth power unit 8 are connected in sequence through a controllable switch to form a fully enclosed ring path; the sixth power unit 6 is connected to the second power unit 2 and the fifth power unit 5 through a controllable switch to form a first sub-path, and the seventh power unit 7 is connected to the sixth power unit 6, the eighth power unit 8, and the eleventh power unit 11 through a controllable switch to form a second sub-path, and the first sub-path and the second sub-path constitute the inner ring path; the first power unit 1 is connected to the tenth power unit 10 through a controllable switch, the third power unit 3 is connected to the twelfth power unit 12 through a controllable switch, and the fourth power unit 4 is connected to the ninth power unit 9 through a controllable switch to form an outer ring path.

[0045] Specifically, the first power unit 1 in the first power conversion device 100 is described. The first power unit 1 is connected to the second power unit 2 through a controllable switch KM1. The first power unit 1 is also connected to the eighth power unit 8 through a controllable switch KM8. In addition, the first power unit 1 is also connected to the tenth power unit 10 through a controllable switch KM16.

[0046] Understandably, the aforementioned connection method enhances the flexibility and scalability of the power distribution device. The system can add or remove power units at any time according to the user's charging needs to meet different charging requirements. Furthermore, based on this connection method, when a fault occurs during charging, the system can control a controllable switch to quickly disconnect the faulty power unit, isolating it and ensuring the safe and stable operation of the entire power distribution device, minimizing the impact on other power units. Simultaneously, this connection method facilitates the maintenance and management of the power distribution device; operators can easily perform maintenance on individual power conversion devices without affecting the normal operation of other units.

[0047] In this embodiment of the application, when the controllable switch connecting the two power units remains closed, the two power units are connected in parallel, that is, the DC terminals of the two power units are connected in parallel, so that the total output power is the sum of the output power of the two power units.

[0048] In the exemplary embodiments, reference continues to be made to Figure 3 The fifth power unit in the first power conversion device is connected to the eighth power unit in the second power conversion device via a controllable switch, and the eighth power unit in the first power conversion device is connected to the fifth power unit in the second power conversion device via a controllable switch.

[0049] It should be noted that, in Figure 3 In the illustrated embodiment, since the first power conversion device 100 and the second power conversion device 200 have the same topology, in order to facilitate the differentiation of each power unit in the first power conversion device 100 and the second power conversion device 200, Figure 3 In the second power conversion device 200, the first power unit 1, the second power unit 2, ..., the twelfth power unit 12 are sequentially labeled as the thirteenth power unit 13, the fourteenth power unit 14, ..., the twenty-fourth power unit 24.

[0050] Understandably, continue to refer to Figure 3 The fifth power unit in the first power conversion device is connected to the eighth power unit in the second power conversion device via a controllable switch. Specifically, the fifth power unit 5 in the first power conversion device 100 is connected to the twentieth power unit 20 in the second power conversion device 2 via a controllable switch KM19. The eighth power unit in the first power conversion device is connected to the fifth power unit in the second power conversion device via a controllable switch. Specifically, the eighth power unit 8 in the first power conversion device 100 is connected to the seventeenth power unit 17 in the second power conversion device 200 via a controllable switch KM38.

[0051] Of course, in other embodiments, only the connection between the fifth power unit 5 in the first power conversion device 100 and the twentieth power unit 20 in the second power conversion device can be retained, or only the connection between the eighth power unit 8 in the first power conversion device 100 and the seventeenth power unit 17 in the second power conversion device can be retained, which can also achieve the interconnection of the first power conversion device 100 and the second power conversion device 200. Furthermore, the figures only illustrate the connection between the fifth power unit in the first power conversion device 100 and the twentieth power unit in the second power conversion device 200. In reality, any power unit in the first power conversion device 100 can be connected to any power unit in the second power conversion device 200 to achieve the purpose of this application.

[0052] In an exemplary embodiment, there may be two power conversion devices, and the two power conversion devices have the same topology. Each power conversion device includes multiple charging gun connection interfaces for connecting charging guns, and the number of charging guns is less than or equal to the number of power units. It is understood that any charging gun can flexibly allocate power units.

[0053] like Figure 3 As shown, both the first power conversion device 100 and the second power conversion device 200 include 12 charging gun connection interfaces for connecting charging guns. Taking the first power conversion device 100 as an example, all power units except the third power unit 3 and the tenth power unit 10 are connected to a charging gun through a charging gun connection interface. That is, the first power unit 1 is connected to charging gun A through a charging gun connection interface, the second power unit 2 is connected to charging gun G through a charging gun connection interface, the fourth power unit 4 is connected to charging gun B through a charging gun connection interface, the seventh power unit 7 is connected to charging gun F through a charging gun connection interface, the eighth power unit 8 is connected to charging gun Q through a charging gun connection interface, the ninth power unit 9 is connected to charging gun D through a charging gun connection interface, the fifth power unit 5 is connected to charging gun R through a charging gun connection interface, the sixth power unit 6 is connected to charging gun E through a charging gun connection interface, the eleventh power unit 11 is connected to charging gun H through a charging gun connection interface, and the twelfth power unit 12 is connected to charging gun C through a charging gun connection interface.

[0054] Please continue to refer to Figure 3 If charging gun A is used to call the 21st power unit 21, the system can control the controllable switches KM1, KM14, KM5, KM19, and KM28 to close, thereby connecting the first power unit 1 to the second power unit 2, the second power unit 2 to the sixth power unit 6, the sixth power unit 6 to the fifth power unit 5, the fifth power unit 5 to the 20th power unit 20, and the 20th power unit 20 to the 21st power unit 21. Thus, charging gun A can call the 21st power unit 21 through each connected power unit.

[0055] For example, if the P charging gun is used to call the fourth power unit 4, the system can control the controllable switches KM34, KM26, KM19, and KM4 to close, thereby connecting the twenty-third power unit 23 to the nineteenth power unit 19, the nineteenth power unit 19 to the twentieth power unit 20, the twentieth power unit 20 to the fifth power unit 5, and the fifth power unit 5 to the fourth power unit 4. Thus, the P charging gun can call the fourth power unit 4 through each connected power unit.

[0056] It is understandable that the number of charging guns connected to the first power conversion device 100 and the second power conversion device 200 through the charging gun connection interface can also be different. The number of charging guns connected to the first power conversion device 100 and the second power conversion device 200 through the charging gun connection interface can be allocated according to actual charging needs, and then the charging guns are connected to the power units in each power conversion device through a charging gun connection interface. For example, if the charging system needs to connect 12 charging guns, the first power conversion device 100 can be selected to connect 6 and the second power conversion device 200 to connect 6, or the first power conversion device 100 can be selected to connect 5 and the second power conversion device 200 to connect 7, or the first power conversion device 100 can be selected to connect 4 and the second power conversion device 200 to connect 8, etc.

[0057] The output terminals of each power unit can not only be connected to other power units, but also be electrically connected to a charging gun through a charging gun connection interface. That is, the input terminals of each power unit can be electrically connected to 380V AC mains power, and the output terminals can be connected to other power units and / or charging guns.

[0058] In the specific implementation process, when using a charging gun to charge a vehicle, the charging gun can be connected to the vehicle to be charged. The electrical energy accumulated by at least a portion of the power units connected to the charging gun's connection interface is output to the vehicle to be charged through the charging gun.

[0059] In this exemplary embodiment, based on the topology of the power conversion device provided in this application, when the charging gun can be selectively connected to different power units through the charging gun connection interface, it does not affect the charging gun's access to the power units. Please refer to... Figure 3 Taking charging gun B as an example, charging gun B is connected to the fourth power unit 4 via a charging gun connection interface. To call the nineteenth power unit 19 using charging gun B, the controllable switches KM4, KM19, and KM26 can be closed. If the connection method of charging gun B is changed, for example, connecting it to the third power unit 3 via a charging gun connection interface, then calling the nineteenth power unit 19 using charging gun B can be achieved by closing the controllable switches KM3, KM4, KM19, and KM26. Therefore, selectively connecting charging guns via each charging gun connection interface does not affect the function of the charging gun in calling any power unit.

[0060] Furthermore, in this embodiment, the charging gun can be connected to the power unit via a matching interface unit, namely the charging gun connection interface. This allows for dynamic adjustment of the charging gun's connection position as needed through the interface unit, improving the overall usability of the power distribution device and charging system. Additionally, the controllable switch design between power units ensures compatibility with the charging needs of different vehicle models and types. Consequently, the flexible connection method of the charging gun enhances the flexibility of vehicle charging for users and improves charging efficiency.

[0061] Another embodiment of this application provides a charging system, including a power distribution device, a controller, and a charging terminal, wherein the controller and a controllable switch are communicatively connected.

[0062] In the specific implementation process, the controllable switch can be opened or closed under the control of the controller to realize the parallel combination of different power units, that is, to achieve different power outputs.

[0063] For example, the charging terminal can be a charging gun or a terminal in a split power distribution device. This exemplary embodiment takes a charging gun as an example. When the charging gun is used to charge the vehicle to be charged, the controller can first determine the number of charging guns that are charging at the same time, and control the on / off state of the controllable switches connecting the two power conversion devices and the controllable switches in each power conversion device according to the power required by each charging gun, so as to obtain the power required by each charging gun and thus realize the simultaneous charging of each charging gun.

[0064] Understandably, the controller is responsible for managing and coordinating all aspects of the charging process. It can intelligently adjust the charging strategy by monitoring parameters such as the battery status, charging current, and voltage of the new energy vehicle, thereby controlling the opening and closing of controllable switches to ensure efficient and safe charging. Simultaneously, the controller is also responsible for fault detection and protection during the charging process, ensuring timely power cut-off in cases of overload, short circuit, or abnormal temperature, thus protecting the equipment and user safety. Furthermore, the controller supports communication with the management system, enabling remote monitoring and management, and enhancing the level of intelligence in the charging process.

[0065] The power distribution device is installed within the charging system, enabling the charging of new energy vehicles based on multiple charging guns.

[0066] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power distribution device, characterized in that, include: At least two power conversion devices, wherein the power conversion devices include multiple power units; In this device, any power unit in the same power conversion device is connected to one or more other power units via a controllable switch; In two different power conversion devices, at least one power unit in one power conversion device is connected to a power unit in the other power conversion device via a controllable switch.

2. The power distribution device according to claim 1, characterized in that, There are two power conversion devices, and the two power conversion devices have the same topology.

3. The power distribution device according to claim 2, characterized in that, The two power conversion devices include a first power conversion device and a second power conversion device; The two power units in the first power conversion device and the two power units in the second power conversion device are connected via the controllable switch.

4. The power distribution device according to claim 2, characterized in that, In the same power conversion device, each of the power units is connected to three other power units via a controllable switch.

5. The power distribution device according to claim 3, characterized in that, Both the first power conversion device and the second power conversion device include twelve power units, and the twelve power units respectively form a fully enclosed ring path, an inner ring path, and an outer ring path; Among them, the first power unit, the second power unit, the third power unit, the fourth power unit, the fifth power unit, the twelfth power unit, the eleventh power unit, the tenth power unit, the ninth power unit and the eighth power unit are connected in sequence through a controllable switch to form the fully enclosed ring path; The sixth power unit is connected to the second power unit and the fifth power unit through a controllable switch to form a first sub-path. The seventh power unit is connected to the sixth power unit, the eighth power unit and the eleventh power unit through a controllable switch to form a second sub-path. The first sub-path and the second sub-path constitute the inner loop path. The first power unit is connected to the tenth power unit via a controllable switch, the third power unit is connected to the twelfth power unit via a controllable switch, and the fourth power unit is connected to the ninth power unit via a controllable switch to form the outer loop path.

6. The power distribution device according to claim 5, characterized in that, The fifth power unit in the first power conversion device is connected to the eighth power unit in the second power conversion device via a controllable switch, and the eighth power unit in the first power conversion device is connected to the fifth power unit in the second power conversion device via a controllable switch.

7. The power distribution device according to claim 2, characterized in that, Both of the power conversion devices include multiple charging gun connection interfaces for connecting charging guns, and the number of charging guns is less than or equal to the number of power units.

8. The power distribution device according to claim 1, characterized in that, The power unit is an AC-DC conversion unit, used to convert AC power into DC power and output DC power.

9. The power distribution device according to claim 1, characterized in that, The controllable switch includes: At least one of contactors, relays, and / or solid-state switches.

10. A charging system, characterized in that, include: The power distribution device, controller, and charging terminal according to any one of claims 1-9, wherein the controller and the controllable switch are communicatively connected.

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