An output power distribution system for a direct current charging stack

Abstract

The utility model provides a kind of output power distribution system for direct current charging pile. Including multiple charging module groups, multiple charging terminals and multiple direct current contactors;Charging module group includes N module groups, and each module group includes at least one charging module, wherein, N is the integer greater than one;Charging terminal includes M terminal, and M is the integer greater than N, wherein at least two terminals are first terminal, and the rest terminal is second terminal;Each first terminal is connected to all N charging module groups by first direct current contactor group, each first direct current contactor group includes N direct current contactor, and each direct current contactor is connected between the output end of one charging module group and the busbar of first terminal;Each second terminal is connected to at least one charging module group by second direct current contactor group, and the busbar of second terminal is connected by third direct current contactor group. While guaranteeing the flexibility of power distribution, economy and scalability are also considered.

Description

Technical Field

[0001] This application relates to the field of power distribution technology, and in particular to an output power distribution system for a DC charging pile. Background Technology

[0002] With the rapid development of electric vehicle charging technology, the power specifications of charging piles are gradually increasing, and the power requirements of vehicle charging vary, leading to the increasingly widespread application of split-type charging piles. In existing technologies, the output power distribution system of DC charging piles mainly adopts a matrix or ring structure. The matrix distribution method achieves precise point-to-point on / off control by configuring a dedicated DC contactor for each independent branch; however, the number of contactors increases linearly with the number of modules, resulting in high costs and a significant increase in the complexity of wiring and copper busbars. The ring distribution method reduces the number of components by using shared paths; however, limited by the closed-loop topology, when adjacent charging terminals are used simultaneously, a single terminal can only call upon a limited number of directly connected modules, resulting in poor power distribution flexibility and an inability to meet the dynamic needs of high-power terminals. Therefore, existing technologies struggle to balance system economy and scalability while ensuring power distribution flexibility. Utility Model Content

[0003] In order to ensure power distribution flexibility while taking into account system economy and scalability, this application provides an output power distribution system for DC charging piles.

[0004] An output power distribution system for a DC charging pile includes: multiple charging module groups, multiple charging terminals, and multiple DC contactors; The charging module group includes N module groups, and each module group includes at least one charging module, where N is an integer greater than one; The charging terminal includes M terminals, where M is an integer greater than N, of which at least two terminals are first-type terminals and the remaining terminals are second-type terminals; Each of the first type of terminals is connected to all N charging module groups through a first DC contactor group. Each first DC contactor group includes N DC contactors, and each DC contactor is connected between the output terminal of a charging module group and the busbar of the first type of terminal. Each of the second type of terminals is connected to at least one charging module group via a second DC contactor group, and the busbars of the second type of terminals are interconnected via a third DC contactor group.

[0005] By adopting the above technical solutions, a hybrid power distribution topology was constructed. The first type of terminal achieves maximum power dispatch flexibility through full connectivity, allowing for the allocation of power across all module groups at any time to ensure high power demands are met. The second type of terminal, by connecting some module groups and integrating busbar interconnection, significantly reduces the number of required DC contactors while ensuring basic power requirements are met, thus lowering system cost and complexity. The inclusion of a third DC contactor group enables power resource sharing among the second type of terminals, enhancing the overall power distribution flexibility of the second-type terminal group and achieving a good balance between system economy and flexibility.

[0006] Preferably, the first type of terminal is a liquid-cooled terminal, and the second type of terminal is a regular terminal.

[0007] By adopting the above technical solution, the high-power, high-current liquid-cooled terminal is designed as the first type of terminal, enabling it to utilize all modules and fully meet its ultra-fast charging requirements. Meanwhile, the ordinary terminal with relatively lower power requirements is designed as the second type of terminal, employing a more economical connection method, achieving on-demand resource allocation, and optimizing the overall system cost-effectiveness.

[0008] Preferably, the N module groups are 9 groups, and the M terminals are 10.

[0009] By adopting the above technical solution, a specific preferred implementation scale is provided, which clarifies the configuration of 18 modules supplying power to 10 terminals, making it easier for those in the field to understand and implement this optimized solution.

[0010] Preferably, each charging module group includes two charging modules.

[0011] By adopting the above technical solution, the basic composition of the module group is clarified, multiple modules are managed in groups, the system structure and control logic are simplified, and at the same time, it is ensured that a single group can provide sufficient reference power.

[0012] Preferably, for each second type of terminal, the charging module group to which the second DC contactor group is connected is an adjacent charging module group.

[0013] By adopting the above scheme, the power dispatch of the second type of terminal is made local and continuous in physical layout, which simplifies the wiring and lays the foundation for power expansion and sharing between adjacent terminals through the third DC contactor group.

[0014] Preferably, the second type of terminals are arranged in sequence, and each second type of terminal is connected to a group of consecutive charging modules through a group of second DC contactors.

[0015] By adopting the above technical solution, the system topology structure was further optimized, making the connection relationship between the second type of terminal and the charging module group more orderly, reducing the complexity of control and wiring, and enhancing the maintainability and scalability of the system.

[0016] Preferably, the busbars of the first type of terminal and the busbars of the second type of terminal are independent of each other.

[0017] By adopting the above technical solution, electrical isolation between the two types of terminals is achieved, mutual interference in power distribution between different types of terminals is avoided, the system control and protection logic is simplified, and the stability and reliability of system operation are improved.

[0018] Preferably, the third DC contactor group includes multiple DC contactors, each DC contactor being connected between the busbars of two second-type terminals.

[0019] By adopting the above technical solution, a power sharing channel between the second type of terminals was constructed. When the power of a certain second type of terminal is insufficient, the power of the adjacent terminal's connected but underutilized module group can be borrowed by closing the corresponding third DC contactor. This realizes the dynamic redistribution of power within the second type of terminal group, improving the overall power utilization and flexibility of the system.

[0020] Preferably, the output of each charging module group is connected to the busbar of at least one terminal via a DC contactor.

[0021] By adopting the above technical solution, it is ensured that the power of all charging module groups can be effectively allocated to at least one terminal, avoiding the idleness of the power pool and ensuring the full utilization of system resources.

[0022] Preferably, the DC contactor is an electromagnetic DC contactor.

[0023] By adopting the above technical solution, the electromagnetic DC contactor is made available, which has the advantages of strong switching capability, convenient control and high reliability. It is suitable for performing reliable power switching in DC high current charging scenarios.

[0024] The output power distribution system for DC charging piles provided by this utility model has the following advantages compared with the prior art: 1. By using a hybrid topology, the flexibility of matrix scheduling and the economy of ring structure are combined.

[0025] 2. Differentiated designs are implemented for terminals with different power requirements, such as liquid-cooled terminals and ordinary terminals, to achieve efficient and precise resource allocation.

[0026] 3. By setting up a third DC contactor group, power can be shared among the second type of terminals, which significantly improves the dynamic flexibility of power distribution without significantly increasing costs.

[0027] 4. The overall system has a clear structure, and the number of DC contactors is significantly reduced compared to the full matrix type, which reduces manufacturing costs and system complexity, and improves reliability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the output power distribution system for a DC charging pile in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the connection structure between the terminal and the busbar in an embodiment of this application.

[0030] Figure label: 1. Charging module groups; 101. First charging module group AU1 and AU2; 102. Second charging module group AU3 and AU4; 103. Third charging module group AU5 and AU6; 104. Fourth charging module group AU7 and AU8; 105. Fifth charging module group AU9 and AU10; 106. Sixth charging module group AU11 and AU12; 107. Seventh charging module group AU13 and AU14; 108. Eighth charging module group AU15 and AU16; 109. Ninth charging module group A U17 and AU18; 2. Charging terminals; 201, 1# liquid-cooled terminal; 202, 10# liquid-cooled terminal; 203, 2# ordinary terminal; 204, 3# ordinary terminal; 205, 4# ordinary terminal; 206, 5# ordinary terminal; 207, 6# ordinary terminal; 208, 7# ordinary terminal; 209, 8# ordinary terminal; 210, 9# ordinary terminal; 3. First DC contactor group; 4. Second DC contactor group; 5. Third DC contactor group; 6. First type terminal busbar; 7. Second type terminal busbar.

[0031] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] This application discloses an output power distribution system for a DC charging pile. For example... Figure 1 and Figure 2 As shown, the system includes multiple charging module groups 1, multiple charging terminals 2, and multiple DC contactors. Specifically, charging module group 1 includes N module groups, where N is 9 in this embodiment. These are: first charging module groups 101AU1 and AU2, second charging module groups 102AU3 and AU4, third charging module groups 103AU5 and AU6, fourth charging module groups 104AU7 and AU8, fifth charging module groups 105AU9 and AU10, sixth charging module groups 106AU11 and AU12, seventh charging module groups 107AU13 and AU14, eighth charging module groups 108AU15 and AU16, and ninth charging module groups 109AU17 and AU18. Each charging module group includes two charging modules, each with a power of 40kW. The nine charging module groups together form a shared power pool with a total power of 18 * 40kW = 720kW, providing sufficient power support for subsequent power allocation at the charging terminals.

[0036] Charging terminal 2 includes M terminals, where M is 10 in this embodiment, and M is greater than N. At least two terminals are of the first type, and the remaining terminals are of the second type. Specifically, the first type of terminals are liquid-cooled terminals, including liquid-cooled terminal 201 (1#) and liquid-cooled terminal 202 (10#). These liquid-cooled terminals are equipped with liquid cooling guns and can achieve a maximum current of 500A, meeting the requirements for high-power ultra-fast charging. The second type of terminals are ordinary terminals, including ordinary terminals 203 (2#), 204 (3#), 205 (4#), 206 (5#), 207 (6#), 208 (7#), 209 (8#), and 210 (9#). These ordinary terminals have a maximum current of 250A and relatively lower power requirements. Furthermore, the busbars 6 for the first type of terminals and 7 for the second type of terminals are independent of each other, achieving electrical isolation between the two types of terminals. This avoids mutual interference in power distribution between different types of terminals, simplifies system control and protection logic, and improves the stability and reliability of system operation.

[0037] The DC contactor is an electromagnetic DC contactor, which has strong switching capacity and high reliability, making it suitable for performing reliable power switching operations in high-current DC charging scenarios. The DC contactor includes a first DC contactor group 3, a second DC contactor group 4, and a third DC contactor group 5.

[0038] Each Class 1 terminal is connected to all nine charging module groups 1 via a first DC contactor group 3. Specifically, the first DC contactor group 3 corresponding to liquid-cooled terminal 201 (#1) includes nine DC contactors K1-1 to K9-1, each connected between the output terminal of a charging module group and the Class 1 terminal busbar 6 of liquid-cooled terminal 201. Similarly, the first DC contactor group 3 corresponding to liquid-cooled terminal 202 (#10) includes nine DC contactors K1-2 to K9-2, each connected between the output terminal of a charging module group and the Class 1 terminal busbar 6 of liquid-cooled terminal 202.

[0039] This fully connected design enables the first type of terminal to access the power of all charging module groups. When the first type of terminal starts charging, the system, based on the power request of the electric vehicle, controls the on / off state of the corresponding DC contactor in the first DC contactor group 3, allowing either liquid-cooled terminal #1 201 or liquid-cooled terminal #10 202 to access any required charging module group. The accessed charging module group is fed into the first type of terminal busbar 6 via the corresponding DC contactor, and the module's power is directly delivered to the terminal after being aggregated by the busbar, meeting the ultra-fast charging requirements. For example, if 3 modules are occupied by ordinary terminals, the liquid-cooled terminal can still access the remaining 6 modules, avoiding insufficient power due to partial module occupancy. When both ordinary terminals and liquid-cooled terminals have charging needs, the system will prioritize the power request of the liquid-cooled terminals, ensuring that high-power demands are responded to promptly.

[0040] Each second-type terminal is connected to at least one charging module group 1 via a second DC contactor group 4, and the second-type terminals are arranged in sequence, with each second-type terminal connected to a set of adjacent charging module groups via a second DC contactor group 4.

[0041] Specifically, the second DC contactor group 4 corresponding to ordinary terminal 203 (#2) includes DC contactors KZ1-3 and KZ2-3. These two DC contactors are connected to the adjacent first charging module groups 101AU1 and AU2 and the second charging module groups 102AU3 and AU4. The electrical energy output from the charging modules is channeled into the second type of terminal bus 7 of ordinary terminal 203 (#2) through DC contactors KZ1-3 and KZ2-3 to power the corresponding electric vehicles. The second DC contactor group 4 corresponding to ordinary terminal 204 (#3) includes DC contactors KZ1-4, KZ2-4, and KZ3-4. These three DC contactors are connected to the adjacent first charging module groups 101AU1 and AU2, second charging module groups 102AU3 and AU4, and third charging module groups 103AU5 and AU6. The electrical energy output from the charging modules is channeled into the second type of terminal bus 7 of ordinary terminal 204 (#3) through the corresponding DC contactors. The remaining second terminals, ordinary terminals 4 to 9, are all connected to a group of consecutive adjacent charging modules through the second DC contactor 4, following the same pattern described above. They will not be described in detail here.

[0042] Meanwhile, the second-type terminal busbars 7 are interconnected via a third DC contactor group 5. The third DC contactor group 5 includes multiple DC contactors, each connected between two adjacent second-type terminal busbars. For example, DC contactor KZ2-4 is connected between the busbar of ordinary terminal 2# 203 and the busbar of ordinary terminal 3# 204. The remaining adjacent second-type terminal busbars are also connected via corresponding DC contactors.

[0043] This design enables the second type of terminals to form a ring-like allocation pattern, allowing for dynamic expansion and calling of one or more adjacent charging module groups. For example, when the power demand of ordinary terminal 203 (#2) is high, and the already called first charging module groups 101AU1 and AU2 and second charging module groups 102AU3 and AU4 cannot meet the charging demand, and the third charging module groups 103AU5 and AU6 are idle, the system can close DC contactors KZ3-4 and KZ2-4, enabling ordinary terminal 203 (#2) to call the third charging module groups 103AU5 and AU6. At this time, the electrical energy output from the third charging module group 103AU5 and AU6 first reaches the busbar of the 3# ordinary terminal 204 through DC contactor KZ3-4, then reaches the output busbar of the second charging module group 102AU3 and AU4 through DC contactor KZ2-4, and merges with the electrical energy output from the original second charging module group 102AU3 and AU4. Finally, it reaches the 2# ordinary terminal 203 directly through DC contactor KZ2-3, thereby increasing the output power of the 2# ordinary terminal 203 to meet its temporary high power demand.

[0044] In addition, the output of each charging module group is connected to the busbar of at least one terminal via a DC contactor, ensuring that the power of all charging module groups can be effectively distributed to at least one terminal, avoiding the idle power pool and ensuring full utilization of system resources.

[0045] The implementation principle is as follows: The output power distribution system for DC charging piles disclosed in this application constructs a shared power pool from charging module groups and employs differentiated connection designs to meet the different power requirements of the first type of liquid-cooled terminals and the second type of ordinary terminals. The first type of terminal achieves full connection with all charging module groups through a first set of DC contactors, ensuring flexibility in high-power allocation. The second type of terminal connects to adjacent continuous charging module groups through a second set of DC contactors and interconnects adjacent terminal busbars through a third set of DC contactors. This reduces the number of DC contactors, lowers system complexity and cost, while achieving dynamic power sharing and expansion. The busbars of the two types of terminals are independent, avoiding interference. All charging module groups can be effectively utilized. Combined with the reliable switching performance of electromagnetic DC contactors, the system ultimately achieves the technical goal of ensuring power distribution flexibility while also considering system economy and scalability.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An output power distribution system for a DC charging pile, characterized in that, include: Multiple charging module groups (1), multiple charging terminals (2), and multiple DC contactors; The charging module group (1) includes N module groups, each module group including at least one charging module, where N is an integer greater than one; The charging terminal (2) includes M terminals, where M is an integer greater than N, of which at least two terminals are first-type terminals and the remaining terminals are second-type terminals; Each of the first type of terminals is connected to all N charging module groups (1) via a first DC contactor group (3). Each first DC contactor group (3) includes N DC contactors, and each DC contactor is connected between the output terminal of a charging module group (1) and the busbar of the first type of terminal. Each of the second type of terminals is connected to at least one charging module group (1) via a second DC contactor group (4), and the busbars of the second type of terminals are interconnected via a third DC contactor group (5).

2. The system according to claim 1, characterized in that, The first type of terminal is a liquid-cooled terminal, and the second type of terminal is a regular terminal.

3. The system according to claim 1, characterized in that, The specific number of the N module groups is 9, and the specific number of the M terminals is 10.

4. The system according to claim 1, characterized in that, Each charging module group (1) includes two charging modules.

5. The system according to claim 1, characterized in that, For each second type of terminal, the charging module group (1) to which the second DC contactor group (4) is connected is the adjacent charging module group (1).

6. The system according to claim 1, characterized in that, The second type of terminals are arranged in sequence, and each second type of terminal is connected to a group of consecutive charging modules (1) through a second DC contactor group (4).

7. The system according to claim 1, characterized in that, The busbars of the first type of terminal and the busbars of the second type of terminal are independent of each other.

8. The system according to claim 1, characterized in that, The third DC contactor group (5) includes multiple DC contactors, each of which is connected between two busbars of the second type of terminal.

9. The system according to claim 1, characterized in that, The output of each charging module group (1) is connected to the busbar of at least one terminal via a DC contactor.

10. The system according to claim 1, characterized in that, The DC contactor is an electromagnetic DC contactor.

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