Community charging system

Abstract

The utility model provides a community charging system, which comprises a direct current energy router and a direct current charging terminal, and is characterized in that the direct current load output end of the direct current energy router is connected with the direct current input end of the direct current charging terminal through a direct current bus; the DC energy router comprises a rectifier, a first power adapter and an energy management unit. The alternating current input end of the rectifier is connected with a superior power supply grid, and the direct current output end of the rectifier serves as the direct current load output end of the direct current energy router and is connected with the direct current input end of the direct current charging terminal through a direct current bus; a first direct current output end of the first power adapter is connected with a power supply input end of the energy management unit; the control output end of the energy management unit is connected with the control input end of the rectifier, and the energy management unit is used for controlling the output power of the rectifier according to the residual capacitance of the superior power supply grid and the electricity demand of the direct current charging terminal.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric vehicle charging, and in particular to a community charging system. Background Art

[0002] In the related art, there are two main types of electric vehicle charging terminals: low-power DC charging piles and AC charging piles. However, for community-level charging networks, since the remaining power capacity of the community is fixed, it is impossible to solve the charging needs of vehicles that exceed the community capacity. Utility Model Content

[0003] The present disclosure provides a community charging system.

[0004] According to a first aspect of the present disclosure, there is provided a community charging system, comprising:

[0005] A DC energy router and a DC charging terminal, wherein a DC load output terminal of the DC energy router is connected to a DC input terminal of the DC charging terminal via a DC bus;

[0006] The DC energy router includes a rectifier, a first power adapter and an energy management unit;

[0007] The AC input end of the rectifier is connected to the upper power supply grid, and the DC output end of the rectifier is connected to the DC input end of the DC charging terminal through a DC bus as the DC load output end of the DC energy router;

[0008] The first DC output terminal of the first power adapter is connected to the power supply input terminal of the energy management unit;

[0009] The control output end of the energy management unit is connected to the control input end of the rectifier, and is used to control the output power of the rectifier according to the remaining capacity of the upper power supply grid and the power demand of the DC charging terminal.

[0010] In some embodiments of the present disclosure, the DC energy router further includes a first protection switch;

[0011] The second DC output terminal of the first power adapter is connected to the power supply input terminal of the first protection switch;

[0012] The AC input end of the rectifier is connected to the upper power supply grid through the first protection switch.

[0013] In some embodiments of the present disclosure, the DC energy router further includes a first human-computer interaction device;

[0014] The third DC output terminal of the first power adapter is connected to the power supply input terminal of the first human-computer interaction device;

[0015] The signal input end of the first human-computer interaction device is connected to the signal output end of the energy management unit, and is used to collect and display the control signal of the energy management unit on the display device of the first human-computer interaction device.

[0016] In some embodiments of the present disclosure, the DC energy router further includes a first network communication device;

[0017] The fourth DC output terminal of the first power adapter is connected to the power supply input terminal of the first network communication device, and the first power adapter is used to supply power to the first network communication device;

[0018] The signal output end of the first network communication device is connected to the signal input end of the energy management unit, and the first network communication device is communicatively connected to the second network communication device of the DC charging terminal.

[0019] In some embodiments of the present disclosure, the DC charging terminal includes a switching power supply, a second power adapter, a charging control unit, and an output switch;

[0020] The DC input end of the switching power supply is connected to the DC load output end of the DC energy router through a DC bus, the DC output end of the switching power supply is connected to the DC input end of the output switch, and the switching power supply is used to charge the load through the output switch;

[0021] The first DC output terminal of the second power adapter is connected to the power supply input terminal of the charging control unit;

[0022] The control output terminal of the charging control unit is connected to the control input terminal of the switching power supply, and is used to control the output power of the switching power supply;

[0023] The control output terminal of the charging control unit is connected to the control input terminal of the output switch, and is used to control the on and off of the output switch according to the charging demand of the load.

[0024] In some embodiments of the present disclosure, the DC charging terminal further includes a second protection switch;

[0025] The second DC output terminal of the second power adapter is connected to the power supply input terminal of the second protection switch;

[0026] The DC input end of the switching power supply is connected to the DC load output end of the DC energy router through the second protection switch and the DC bus.

[0027] In some embodiments of the present disclosure, the DC charging terminal further includes a second human-computer interaction device;

[0028] The third DC output terminal of the second power adapter is connected to the power supply input terminal of the second human-computer interaction device;

[0029] The signal input terminal of the second human-computer interaction device is connected to the signal output terminal of the charging control unit, and is used to collect and display the control signal of the charging control unit on the display device of the second human-computer interaction device.

[0030] In some embodiments of the present disclosure, the DC charging terminal further includes a second network communication device;

[0031] The fourth DC output terminal of the second power adapter is connected to the power supply input terminal of the second network communication device;

[0032] The signal output end of the second network communication device is connected to the signal input end of the charging control unit, and the second network communication device is communicatively connected to the first network communication device of the DC energy router.

[0033] In some embodiments of the present disclosure, the load is an electric vehicle or an energy storage device.

[0034] In some embodiments of the present disclosure, the upper-level power supply grid is a mains power supply grid, and the AC input end of the rectifier is connected to the mains power supply grid.

[0035] The present disclosure provides a community charging system, including a DC energy router and a DC charging terminal, wherein the DC load output terminal of the DC energy router is connected to the DC input terminal of the DC charging terminal through a DC bus; the DC energy router includes a rectifier, a first power adapter and an energy management unit; the AC input terminal of the rectifier is connected to an upper-level power supply grid, and the DC output terminal of the rectifier is connected to the DC input terminal of the DC charging terminal through a DC bus as the DC load output terminal of the DC energy router; the first DC output terminal of the first power adapter is connected to the power supply input terminal of the energy management unit; the control output terminal of the energy management unit is connected to the control input terminal of the rectifier, and is used to control the output power of the rectifier according to the remaining capacity of the upper-level power supply grid and the power demand of the DC charging terminal.

[0036] According to the solution provided by the present disclosure, the community charging system includes a DC energy router and a DC charging terminal, and the DC load output terminal of the DC energy router is connected to the DC input terminal of the DC charging terminal through a DC bus. The energy management unit in the DC energy router can control the output power of the rectifier according to the remaining capacity of the upper power supply grid and the power demand of the DC power supply terminal, so that the remaining capacity of the upper power supply grid can meet the charging demand of electric vehicles that exceed the community capacity.

[0037] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure.

[0039] Figure 1 A schematic diagram of the structure of a community charging system in the related technology provided by the present disclosure;

[0040] Figure 2 A schematic diagram of the structure of a DC energy router provided in an embodiment of the present disclosure;

[0041] Figure 3 A schematic diagram of the structure of a DC charging terminal provided in an embodiment of the present disclosure;

[0042] Figure 4 A block diagram of a community charging network provided for an example of application of the present disclosure;

[0043] Figure 5 A schematic diagram of the layout of a community charging network provided for an application example of the present disclosure;

[0044] Figure 6 A schematic diagram of the structure of a first community charging network provided for an application example of the present disclosure;

[0045] Figure 7 A schematic diagram of the structure of a second community charging network provided for an application example of the present disclosure;

[0046] Figure 8 A schematic diagram of the structure of a third community charging network provided for an application example of the present disclosure. DETAILED DESCRIPTION

[0047] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0048] A DC energy router, a DC charging terminal, and a community charging system according to embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0049] In the related technology, there are two main types of electric vehicle charging terminals: low-power DC charging piles and AC charging piles. Figure 1 As shown, the community charging system in the related art includes an AC bus and an electric vehicle charging terminal. The electric vehicle charging terminal is connected to the upper power supply network through the AC bus to charge the electric vehicle. The upper power supply network can be a distribution box provided by the municipal power supply agency, and once the community reports the electricity demand, for the community-level charging network, the remaining power capacity of the community is fixed, such as 120KVA. The distribution box converts and outputs 120KW of power through the intelligent distribution cabinet, and supplies power to the electric vehicle charging terminal through the AC bus.

[0050] In the related art, the output power of the DC charging pile in the electric vehicle charging terminal is 7KW, and the output power of the AC charging pile is 20KW. Therefore, in order to meet the charging demand, a maximum of 17 DC charging piles and a maximum of 6 AC charging piles are configured. In this case, if the number of existing electric vehicle charging terminals is insufficient or the number of electric vehicles increases day by day, it will not be possible to solve the charging demand of vehicles that exceed the community capacity.

[0051] In order to solve the above technical problems, an embodiment of the present disclosure provides a community charging network.

[0052] like Figure 2 As shown, the community charging network includes a DC energy router and a DC charging terminal, and the DC load output end of the DC energy router is connected to the DC input end of the DC charging terminal through a DC bus;

[0053] The DC energy router includes a rectifier 201, a first power adapter 202 and an energy management unit 203;

[0054] The AC input end of the rectifier 201 is connected to the upper power supply grid, and the DC output end of the rectifier 201 is connected to the DC input end of the DC charging terminal through a DC bus as the DC load output end of the DC energy router;

[0055] The first DC output terminal of the first power adapter 202 is connected to the power supply input terminal of the energy management unit 203, and the first power adapter 202 is used to supply power to the energy management unit 203;

[0056] The control output end of the energy management unit 203 is connected to the control input end of the rectifier 201, and is used to control the output power of the rectifier 201 according to the remaining capacity of the upper power supply grid and the power demand of the lower power supply terminal.

[0057] In one embodiment, the upper power supply grid may be a city power grid, and the city power grid provides power to the DC energy router through a high-voltage distribution box and a distribution cabinet.

[0058] In one embodiment, the rectifier 201 may be an AC / DC unit for converting the AC power of the upper power supply grid into DC power. And the rectifier 201 is also used to output corresponding power under the control of the energy management unit 203, and supply power to the DC charging terminal through the DC bus. In one embodiment, the rectifier 201 may convert the AC power supplied by the upper power supply grid into DC power by means of rectification.

[0059] In one embodiment, the DC busbar can be set through a high-voltage voltage platform, and the high-voltage voltage platform can adopt a high-voltage voltage platform of 800 to 1000V. The DC busbar set through the high-voltage voltage platform supplies power to the DC charging terminal, which can greatly reduce the power supply current from the distribution side (superior power supply grid) to the terminal side (DC charging terminal) and reduce the diameter of the power supply cable. Compared with the method in the related art that the distribution side supplies power to the terminal side through a 220V AC busbar, such as supplying power to a DC charging pile with a power of 7KW, the setting of the DC busbar can reduce the power supply current from 32A to 9A, the diameter of the power supply cable can be reduced from 6 mm to 1.5 mm, the line loss is theoretically reduced by 80% to 90%, and the laying cost of the power supply cable is reduced.

[0060] In one embodiment, the first power adapter 202 may adopt a multi-output power module. The first power adapter 202 can supply power to the energy management unit 203 according to a preset power supply voltage of the energy management unit 203 to ensure normal power supply of the energy management unit 203.

[0061] In one embodiment, the energy management unit 203 is used to schedule and optimize electric energy. Specifically, the energy management unit 203 can transmit electric energy quantitatively according to preset goals, such as economic benefits or user-defined optimization goals, according to the remaining capacity of the upper power supply grid, and the power demand of the lower power supply terminal. The quantitative transmission method can be to control the output power of the rectifier 201.

[0062] In one embodiment, the energy management unit 203 can allocate power to each of the DC charging terminals through the rectifier 201 according to the number of the DC charging terminals in use, thereby supporting the construction of a larger number of DC charging terminals.

[0063] In one embodiment, when one of the DC charging terminals is not working, that is, the electric vehicle is not charged, the energy management unit 203 can release the electric energy to other DC charging terminals.

[0064] According to the DC energy router provided by the present disclosure, the DC energy router is arranged between the DC charging terminal and the upper power supply grid. The energy management unit 203 in the DC energy router can control the output power of the rectifier 201 according to the remaining capacity of the upper power supply grid and the power demand of the DC charging terminal, so that the remaining capacity of the upper power supply grid can meet the charging demand of vehicles exceeding the community capacity.

[0065] In one embodiment, the DC energy router further includes a first protection switch 204;

[0066] The second DC output terminal of the first power adapter 202 is connected to the power supply input terminal of the first protection switch 204, and the first power adapter 202 is used to supply power to the first protection switch 204;

[0067] The AC input end of the rectifier 201 is connected to the upper power supply grid through the first protection switch 204 .

[0068] When the DC energy router encounters a fault such as current overload or short circuit, the first protection switch 204 is automatically disconnected to prevent the accident from further expanding.

[0069] In one embodiment, the DC energy router further includes a first human-computer interaction device 205;

[0070] The third DC output terminal of the first power adapter 202 is connected to the power input terminal of the first human-computer interaction device 205, and is used to supply power to the first human-computer interaction device 205;

[0071] The signal input end of the first human-computer interaction device 205 is connected to the signal output end of the energy management unit 203 for collecting and displaying the control signal of the energy management unit 203 on the display device of the first human-computer interaction device 205 .

[0072] In one embodiment, the user can monitor the charging process of the electric vehicle in real time through the first human-machine interaction device 205, thereby ensuring higher charging safety. Furthermore, the first human-machine interaction device 205 can also communicate with the user's mobile phone or vehicle-mounted smart device through the network, thereby ensuring that the user receives information in real time.

[0073] In one embodiment, the DC energy router further includes a first network communication device 206;

[0074] The fourth DC output terminal of the first power adapter 202 is connected to the power input terminal of the first network communication device 206, and the first power adapter 202 is used to supply power to the first network communication device 206;

[0075] The signal output terminal of the first network communication device 206 is connected to the signal input terminal of the energy management unit 203; the first network communication device 206 is communicatively connected to the second network communication device 307 of the DC charging terminal.

[0076] In one embodiment, through the setting of the first network communication device 206, the DC energy router can directly communicate with the DC charging terminal, and then communicate with the electric vehicle connected to the DC charging terminal, thereby realizing automatic identification of information such as the electric vehicle model, and ensuring the accuracy of power allocation to the corresponding DC charging terminal.

[0077] like Figure 3 The DC charging terminal includes a switching power supply 301, a second power adapter 302, a charging control unit 303 and an output switch 304;

[0078] The DC input end of the switching power supply 301 is connected to the DC load output end of the DC energy router through a DC bus, and the DC output end of the switching power supply 301 is connected to the DC input end of the output switch 304. The switching power supply 301 is used to charge the load through the output switch 304. In one embodiment, the switching power supply can adopt a DC / DC module.

[0079] The first DC output terminal of the second power adapter 302 is connected to the power supply input terminal of the charging control unit 303, and the second power adapter 302 is used to supply power to the charging control unit 303;

[0080] The control output terminal of the charging control unit 303 is connected to the control input terminal of the switching power supply 301, and the charging control unit 303 is used to control the output power of the switching power supply 301;

[0081] The control output end of the charging control unit 303 is connected to the control input end of the output switch 304 , and the charging control unit 303 is used to control the on-off of the output switch 304 according to the charging demand of the load.

[0082] In one embodiment, the switching power supply 301 is used to output corresponding voltage and current under the control of the charging control unit 303. The charging control unit 303 can collect information of the electric vehicle being charged based on CAN or other methods, and then control the switching power supply 301 to output corresponding voltage and current.

[0083] Through the DC charging terminal provided by the present disclosure, the DC charging terminal is connected to the DC energy router through a DC bus, which reduces the deployment difficulty of the DC charging terminal. At the same time, under the control of the DC energy router, the number of deployments of the DC charging terminal is not limited.

[0084] In one embodiment, the DC charging terminal further includes a second protection switch 305;

[0085] The second DC output terminal of the second power adapter 302 is connected to the power supply input terminal of the second protection switch 305, and the second power adapter 302 is used to supply power to the second protection switch 305;

[0086] The DC input end of the switching power supply 301 is connected to the DC load output end of the DC energy router through the second protection switch 305 and the DC bus.

[0087] In one embodiment, when the DC charging terminal encounters a fault such as a current overload or a short circuit, the second protection switch 305 is automatically disconnected to prevent the accident from further expanding.

[0088] In one embodiment, the DC charging terminal further includes a second human-computer interaction device 306;

[0089] The third DC output terminal of the second power adapter 302 is connected to the power input terminal of the second human-computer interaction device 306, so as to supply power to the second human-computer interaction device 306;

[0090] The signal input end of the second human-machine interaction device 306 is connected to the signal output end of the charging control unit 303 , and is used to collect and display the control signal of the charging control unit 303 on the display device of the second human-machine interaction device 306 .

[0091] In one embodiment, the user can monitor the charging process of the electric vehicle in real time through the second human-machine interaction device 306, thereby ensuring higher charging safety. Furthermore, the second human-machine interaction device 306 can also communicate with the user's mobile phone or vehicle-mounted smart device through the network, thereby ensuring that the user receives information in real time.

[0092] In one embodiment, the DC charging terminal further includes a second network communication device 307;

[0093] The fourth DC output terminal of the second power adapter 302 is connected to the power input terminal of the second network communication device 307, and the second power adapter 302 is used to supply power to the second network communication device 307;

[0094] The signal output terminal of the second network communication device 307 is connected to the signal input terminal of the charging control unit 303 , and the second network communication device 307 is communicatively connected to the first network communication device 206 of the DC energy router.

[0095] In one embodiment, through the configuration of the second network communication device 307, the DC charging terminal can communicate with the connected electric vehicle, realize automatic identification of information such as the electric vehicle model, and ensure the accuracy of power allocation to the corresponding DC charging terminal.

[0096] In one embodiment, the load is an electric vehicle or an energy storage device.

[0097] In one embodiment, the upper power supply grid is a mains power supply grid, and the AC input end of the rectifier 201 is connected to the mains power supply grid.

[0098] Exemplarily, the community charging system provided by the embodiment of the present disclosure is as follows: Figure 4 and Figure 5 The community charging system includes the DC energy router 401 described in the embodiment of the present disclosure, and at least one DC charging terminal 402 described in the embodiment of the present disclosure, the input end of the DC energy router 401 is connected to the upper power supply grid 403, and the output end of the DC energy router 401 is connected to the input end of each DC charging terminal 402 through a DC bus 404; the charging control unit of the DC energy router 401 communicates with the energy management unit of each DC charging terminal 402; the DC charging terminal 402 is used to charge the electric vehicle 405.

[0099] In one embodiment, the communication method of the charging control unit of the DC energy router 401 and the energy management unit of each DC charging terminal 402 may be: the first network communication device communicates with the second network communication device.

[0100] In one embodiment, the number of the DC charging terminals 402 is not limited, and may be 5, 10, 20, or 30.

[0101] Will Figure 5 and Figure 1 By comparison, the differences between the community charging system in the related art and the community charging system provided in the present disclosure can be obtained as shown in Table 1 below.

[0102]

[0103] Table 1 Comparison table of community charging networks in related art and community charging networks provided by embodiments of the present disclosure Through the community charging system provided by the present disclosure,

[0104] First, the number of the DC charging terminals 402 is not limited, and the total power of the DC charging terminals 402 can be greater than the output power of the DC energy router 401. The energy management unit of the DC energy router 401 can allocate power to each working DC charging terminal 402 according to the number of the working DC charging terminals 402.

[0105] Secondly, the DC charging terminal 402 complies with relevant national standards such as GB / T 18487.1 and GB / T 27930, and the communication consistency and compatibility requirements of GB / T 34658, and supports charging adaptation of more than 95% of electric vehicles 405 on the market. The charging power is only related to the power size of the switching power supply in the DC charging terminal 402 selected by the user, and the vehicle does not need to be modified.

[0106] Again, the power of the rectifier of the DC energy router 401 is interlocked with the remaining power capacity of the community, and the change in the number of the DC charging terminals 402 is isolated to avoid the impact and influence of the vehicle charging tidal effect on the community power distribution.

[0107] Again, the DC energy router 401 and the DC charging terminal 402 are transmitted via the DC bus 404, which has more economical wiring costs and lower line losses in community application scenarios.

[0108] In one embodiment, the charging control unit of the DC energy router 401 communicates with the energy management unit of each DC charging terminal 402 in the following manner: the DC charging terminal 402 interacts with the BMS of the electric vehicle 405 via CAN messages. The new national standard can support customized functional modules to realize the interconnection of charging plans and support more intelligent network-level charging plan settings.

[0109] In one embodiment, since the DC charging terminal 402 has the switching power supply built in, commercial differentiated pricing can be achieved based on different user usage requirements and vehicle requirements, such as for power requirements of 11KW to 20KW or higher.

[0110] like Figure 6 , 7 As shown in 8, Figure 6 , 7 8 are schematic diagrams of three application scenarios of the community charging system provided by the present invention.

[0111] In one embodiment, the application scenario is as follows Figure 6 As shown, the DC energy router adopts a 120KWA DC energy router, and is deployed in a deployment mode of connecting 12 DC charging terminals with one DC energy router. In actual applications, if the capacity of the DC energy router is less than 120KWA, the number of the DC charging terminals can be reduced accordingly.

[0112] In one embodiment, the application scenario is as follows Figure 7 As shown, if the capacity of the DC energy router is greater than 120KWA, multiple 120KWA DC energy routers can be cascaded to provide power, wherein each DC energy router can be connected to 12 DC charging terminals.

[0113] In one embodiment, the application scenario is as follows Figure 8 As shown, it can also support third-party equipment and vehicles (such as energy storage systems, private charging piles, etc.) that comply with the DC bus interface definition to access the DC bus for a fee.

[0114] It should be noted that in the embodiments of the present disclosure, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0115] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0116] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0117] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0118] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A community charging system, characterized in that: include: A DC energy router and a DC charging terminal, wherein a DC load output terminal of the DC energy router is connected to a DC input terminal of the DC charging terminal via a DC bus; The DC energy router includes a rectifier, a first power adapter and an energy management unit; The AC input end of the rectifier is connected to the upper power supply grid, and the DC output end of the rectifier is connected to the DC input end of the DC charging terminal through a DC bus as the DC load output end of the DC energy router; The first DC output terminal of the first power adapter is connected to the power supply input terminal of the energy management unit; The control output end of the energy management unit is connected to the control input end of the rectifier, and is used to control the output power of the rectifier according to the remaining capacity of the upper power supply grid and the power demand of the DC charging terminal.

2. The system according to claim 1, characterized in that The DC energy router also includes a first protection switch; The second DC output terminal of the first power adapter is connected to the power supply input terminal of the first protection switch; The AC input end of the rectifier is connected to the upper power supply grid through the first protection switch.

3. The system according to claim 1, characterized in that The DC energy router also includes a first human-computer interaction device; The third DC output terminal of the first power adapter is connected to the power supply input terminal of the first human-computer interaction device; The signal input end of the first human-computer interaction device is connected to the signal output end of the energy management unit, and is used to collect and display the control signal of the energy management unit on the display device of the first human-computer interaction device.

4. The system according to claim 1, characterized in that The DC energy router also includes a first network communication device; The fourth DC output terminal of the first power adapter is connected to the power supply input terminal of the first network communication device, and the first power adapter is used to supply power to the first network communication device; The signal output end of the first network communication device is connected to the signal input end of the energy management unit, and the first network communication device is communicatively connected to the second network communication device of the DC charging terminal.

5. The system according to claim 1, characterized in that The DC charging terminal includes a switching power supply, a second power adapter, a charging control unit and an output switch; The DC input end of the switching power supply is connected to the DC load output end of the DC energy router through a DC bus, the DC output end of the switching power supply is connected to the DC input end of the output switch, and the switching power supply is used to charge the load through the output switch; The first DC output terminal of the second power adapter is connected to the power supply input terminal of the charging control unit; The control output terminal of the charging control unit is connected to the control input terminal of the switching power supply, and is used to control the output power of the switching power supply; The control output terminal of the charging control unit is connected to the control input terminal of the output switch, and is used to control the on and off of the output switch according to the charging demand of the load.

6. The system according to claim 5, characterized in that The DC charging terminal also includes a second protection switch; The second DC output terminal of the second power adapter is connected to the power supply input terminal of the second protection switch; The DC input end of the switching power supply is connected to the DC load output end of the DC energy router through the second protection switch and the DC bus.

7. The system according to claim 5, characterized in that The DC charging terminal also includes a second human-computer interaction device; The third DC output terminal of the second power adapter is connected to the power supply input terminal of the second human-computer interaction device; The signal input terminal of the second human-computer interaction device is connected to the signal output terminal of the charging control unit, and is used to collect and display the control signal of the charging control unit on the display device of the second human-computer interaction device.

8. The system according to claim 5, characterized in that The DC charging terminal also includes a second network communication device; The fourth DC output terminal of the second power adapter is connected to the power supply input terminal of the second network communication device; The signal output end of the second network communication device is connected to the signal input end of the charging control unit, and the second network communication device is communicatively connected to the first network communication device of the DC energy router.

9. The system according to claim 5, characterized in that The load is an electric vehicle or an energy storage device.

10. The system according to any one of claims 1 to 9, characterized in that The upper power supply grid is a mains power supply grid, and the AC input end of the rectifier is connected to the mains power supply grid.

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