A power distribution unit, charging device and system

Abstract

This invention provides a power distribution unit, charging device, and system. The power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay. A first end of the high-voltage contactor group is electrically connected to a first output end of a charging module group, and a second end of the high-voltage contactor group is electrically connected to a first input end of a charging interface group. A first end of the low-voltage relay group is electrically connected to a second output end of the charging module group, and a second end of the low-voltage relay group is electrically connected to a second input end of the charging interface group. By implementing this invention, while keeping the high-voltage contactor connected to one pole of the power supply unchanged, the contactor connected to the other pole of the power supply is replaced with a low-voltage relay, which reduces the size and weight of the power distribution unit while also considering the requirements for service life and safety.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and in particular to a power distribution unit, charging equipment and system. Background Technology

[0002] In charging scenarios, different electric vehicles have different charging power requirements. Therefore, a power distribution unit is needed to allocate the corresponding charging modules according to different charging needs to meet the charging requirements. At the same time, it is necessary to avoid allocating too many charging modules, resulting in low utilization of the charging modules, or allocating too few, resulting in insufficient charging power.

[0003] In existing charging technologies, some power distribution units use high-voltage contactors for all switches, resulting in strong breaking capacity and long service life. However, this leads to large switch sizes and consequently, a large overall component size. Other power distribution units use low-voltage relays for all switches, which are smaller, reducing the overall size of the power distribution unit. However, these relays have weaker breaking capacity and shorter service life. Still other power distribution units also use low-voltage relays, but with a semiconductor switch connected in series in the circuit. This separates the control of the low-voltage relay and the semiconductor switch, utilizing the semiconductor switch to handle the current that may be generated during opening and closing, thus enabling the low-voltage relay to open and close with zero arc. However, this solution adds a high-power semiconductor switch, requiring a heat sink and fan, further increasing the number of components. Utility Model Content

[0004] This invention provides a power distribution unit, charging device and system, aiming to solve the problem that the power distribution unit in the related technology cannot achieve a good balance between breaking capacity, service life and size.

[0005] To address the aforementioned technical problems, the first aspect of this utility model provides a power distribution unit, comprising:

[0006] A high-voltage contactor group and a low-voltage relay group; wherein the high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay;

[0007] The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group.

[0008] The first terminal of the low-voltage relay group is used for electrical connection to the second output terminal of the charging module group, and the second terminal of the low-voltage relay group is used for electrical connection to the second input terminal of the charging interface group.

[0009] A second aspect of this utility model provides a charging device, comprising: a charging module group, a charging interface group, and a power distribution unit. The charging module group is electrically connected to the charging interface group through the power distribution unit. The charging module group includes at least one charging module, the charging interface group includes at least one charging interface, and the power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay.

[0010] The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group.

[0011] The first terminal of the low-voltage relay group is used for electrical connection to the second output terminal of the charging module group, and the second terminal of the low-voltage relay group is used for electrical connection to the second input terminal of the charging interface group.

[0012] Furthermore, each of the charging modules is electrically connected to at least one of the charging interfaces via a high-voltage contactor, a low-voltage relay, and a first terminal of the high-voltage contactor, which is electrically connected to a first output terminal of one of the charging modules; a second terminal of the high-voltage contactor, which is electrically connected to a first input terminal of one of the charging interfaces; a first terminal of the low-voltage relay, which is electrically connected to a second output terminal of one of the charging modules; and a second terminal of the low-voltage relay, which is electrically connected to a second input terminal of one of the charging interfaces.

[0013] Furthermore, each of the charging modules is electrically connected to each of the charging interfaces via a high-voltage contactor and a low-voltage relay respectively; wherein there are A charging modules (A>0), B charging interfaces (B>0), and the power distribution unit includes A*B high-voltage contactors and A*B low-voltage relays.

[0014] Furthermore, the charging modules are connected in series to form a ring connection via the high-voltage contactor, and the charging module is connected to a non-adjacent charging module via the high-voltage contactor to form a branch within the ring; wherein, when the number of charging modules is odd, at least one of the charging modules is pre-selected not to participate in forming the branch within the ring; wherein, the non-adjacent charging module is the charging module that is not directly connected on the ring.

[0015] Furthermore, the number of charging modules is N (N>3). When N is even, the i-th charging module (i≤N) is connected to the (i+N / 2)-th charging module through the contactor to form an inner branch. When N is odd, the i-th charging module is connected to the (i+(N+1) / 2)-th or (i+(N-1) / 2)-th charging module through the contactor to form an inner branch, and there is any charging module that does not participate in forming an inner branch.

[0016] Furthermore, it also includes a controller; the controller is connected to each of the high-voltage contactors and the low-voltage relays respectively.

[0017] A third aspect of this utility model provides a charging system, comprising:

[0018] The system includes a charging module group, a charging interface group, and a power distribution unit. The charging module group is electrically connected to the charging interface group through the power distribution unit. The charging module group includes at least one charging module, the charging interface group includes at least one charging interface, and the power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay.

[0019] The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group.

[0020] The first terminal of the low-voltage relay group is used for electrical connection to the second output terminal of the charging module group, and the second terminal of the low-voltage relay group is used for electrical connection to the second input terminal of the charging interface group.

[0021] Furthermore, each of the charging modules is electrically connected to at least one of the charging interfaces via one of the high-voltage contactors and one of the low-voltage relays.

[0022] Furthermore, it also includes a control module; the control module is connected to each of the high-voltage contactors and the low-voltage relays respectively.

[0023] As can be seen from the above description, compared with related technologies, this utility model keeps the high-voltage contactor connected to one pole of the power supply unchanged, and replaces the contactor connected to the other pole of the power supply with a low-voltage relay. The high-voltage contactor and the low-voltage relay are controlled separately, allowing the high-voltage contactor with strong breaking and arc-extinguishing capabilities to first bear the arc that may be generated during closing and opening, and allowing the small low-voltage relay to open and close with zero current. This reduces the size and weight of the power distribution unit, while also taking into account the requirements of service life and safety. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a power distribution unit provided in the first aspect of the present invention;

[0025] Figure 2 This is a circuit diagram of a charging device provided in the second aspect of the present invention;

[0026] Figure 3 This is a circuit diagram of another charging device provided in the second aspect of the present invention;

[0027] Figure 4 This is a circuit diagram of another charging device provided in the second aspect of the present invention;

[0028] Figure 5 This is a simplified structural diagram of a charging module in a charging device provided in the second aspect of the present utility model.

[0029] Figure 6 This is a simplified structural diagram of another charging module in the charging device provided in the second aspect of the present utility model;

[0030] Figure 7 This is a schematic diagram of a charging system provided in the third aspect of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] The Power Distribution Unit (PDU) contains at least one switch connected to a power distribution path. One end of the switch is connected to at least one charging module group via an input bus, and the other end is connected to at least one charging interface via an output bus. The opening and closing of the switch distributes the charging modules to different charging interfaces, achieving flexible power distribution. The input bus is connected to the positive and negative terminals of the charging modules. The switch connected to the positive bus is the positive switch, and the switch connected to the negative bus is the negative switch. Typically, the positive and negative switches are of the same specification, forming a pair. The drive signal is simultaneously provided by the controller, theoretically resulting in simultaneous opening and closing actions. The feedback signals of each switch are connected to a separate feedback interface to monitor the status of each switch.

[0033] In current charging technologies, PDUs typically use high-voltage contactors for all switches. The advantages are strong breaking capacity and long lifespan, but the disadvantages are large switch size and a large PDU overall. One type of PDU uses low-voltage relays instead of high-voltage contactors for all switches. The advantages are smaller size and a smaller PDU overall, but the disadvantages are weaker breaking capacity and shorter lifespan. Another type of PDU also uses low-voltage relays for all switches, with a semiconductor switch connected in series. This separates the control of the low-voltage relays and the semiconductor switch, using the semiconductor switch to handle the current that may be generated during switching, thus ensuring zero-arc switching of the low-voltage relays and guaranteeing lifespan and safety. However, this increases the power consumption by requiring a high-power semiconductor switch and a heat sink and fan.

[0034] As can be seen from the above, in the relevant technologies, there is a problem that the breaking capacity, service life and size of the power distribution unit cannot be well combined. Therefore, the present invention provides a power distribution unit, a charging device and a system.

[0035] like Figure 1 The diagram shows a power distribution unit 10 according to a first aspect of the present invention. The power distribution unit 10 includes a low-voltage relay group 101 and a high-voltage contactor group 102. The low-voltage relay group 101 includes at least one low-voltage relay, and the high-voltage contactor group 102 includes at least one high-voltage contactor. The first end of the high-voltage contactor group 102 is used to electrically connect to the first output end of the charging module group 20, and the second end of the high-voltage contactor group 102 is used to electrically connect to the first input end of the charging interface group 30. The first end of the low-voltage relay group 101 is used to electrically connect to the second output end of the charging module group 20, and the second end of the low-voltage relay group 101 is used to electrically connect to the second input end of the charging interface group 30.

[0036] Specifically, in this embodiment, one pole of the power supply uses all high-voltage contactors, and the other pole uses all low-voltage relays, with the connection relationship remaining unchanged. When the low-voltage relay is detected as closed, the high-voltage contactor is then controlled to close. This allows the high-voltage contactor to handle any potential instantaneous current, while the low-voltage relay closes with zero arc. When the charging module is released, its current is reduced and it stops. Then, the high-voltage contactor is first controlled to disconnect; after detecting that it has disconnected, the low-voltage relay is then controlled to disconnect. This allows the high-voltage contactor to interrupt any potential load current, while the low-voltage relay disconnects with zero arc. Because the low-voltage relay achieves zero-arc opening and closing, its weak breaking capacity is avoided. This allows for the use of its small size to reduce the PDU's volume and weight, while still meeting requirements for service life and safety.

[0037] like Figure 2The diagram shown is a circuit schematic of a charging device provided in the second aspect of this utility model. Please refer to [link / reference]. Figure 2 The charging equipment includes: a charging module group, a charging interface group, and a power distribution unit 10. The charging module group is electrically connected to the charging interface group through the power distribution unit 10. The charging module group includes at least one charging module 201-20A, the charging interface group includes at least one charging interface 301-30B, and the power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor K. xyH (Where x represents the charging module number and y represents the charging interface number), the low-voltage relay group includes at least one low-voltage relay K. xyL The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group; the first end of the low-voltage relay group is used to electrically connect to the second output end of the charging module group, and the second end of the low-voltage relay group is used to electrically connect to the second input end of the charging interface group.

[0038] Further, please see Figure 2 Each charging module is connected to a high-voltage contactor K. xyH A low-voltage relay K xyL Electrically connected to at least one charging interface; wherein, high-voltage contactor K xyH The first terminal is electrically connected to the first output terminal of a charging module, and the high-voltage contactor K xyH The second terminal is electrically connected to the first input terminal of a charging interface, and the low-voltage relay K... xyL The first terminal is electrically connected to the second output terminal of a charging module, and the low-voltage relay K xyL The second end is electrically connected to the second input end of a charging interface.

[0039] Furthermore, please see Figure 2 Each charging module is electrically connected to each charging interface through a high-voltage contactor and a low-voltage relay respectively; there are A charging modules (A>0), B charging interfaces (B>0), and the power distribution unit includes A*B high-voltage contactors and A*B low-voltage relays.

[0040] Specifically, in this embodiment, one pole of the power supply uses all high-voltage contactors, and the other pole uses all low-voltage relays, while the connection relationship remains unchanged. It is understood that... Figure 2For example, a high-voltage contactor is used on the positive side and a low-voltage relay on the negative side; in practice, the opposite can also be used, and no specific limitation is made here. When the low-voltage relay is detected as closed, the high-voltage contactor is then controlled to close. This allows the high-voltage contactor to handle any potential instantaneous current, while the low-voltage relay closes with zero arc. When the charging module is released, its current is reduced and it stops. Afterward, the high-voltage contactor is first controlled to disconnect; once disconnected, the low-voltage relay is then controlled to disconnect. This allows the high-voltage contactor to interrupt any potential load current, while the low-voltage relay disconnects with zero arc. Because the low-voltage relay achieves zero-arc opening and closing, its weak breaking capacity is avoided. This allows for the use of its small size to reduce the PDU's volume and weight, while still meeting requirements for service life and safety.

[0041] In some alternative embodiments, such as Figure 3 The diagram shown is a circuit schematic of another charging device provided in an embodiment of this utility model. Please refer to [link / reference]. Figure 3 ,exist Figure 3 In this example, four charging modules and four charging interfaces are set. This embodiment saves the high-voltage contactor and low-voltage relay on the same path as the charging module and the charging interface. It can still achieve the effect of establishing an electrical connection between each charging module and each charging interface, and can further save the size of the device.

[0042] Furthermore, such as Figure 4 The diagram shown is a circuit schematic of another charging device provided in the second aspect of the present invention. Please refer to [link / reference]. Figure 4 Charging modules 201 to 206 are connected in series to form a ring connection via high-voltage contactors, and each charging module is connected to a non-adjacent charging module via a high-voltage contactor to form a branch within the ring. When the number of charging modules is odd, at least one charging module is pre-selected not to participate in forming a branch within the ring. The non-adjacent charging modules are those that are not directly connected on the ring.

[0043] Specifically, for ease of understanding, the charging module can be considered as a node, such as... Figure 5 As shown in the figure, charging modules 201-206 are simplified to 1#-6#, and high-voltage contactors are simplified to 1-9. High-voltage contactors 1-6 connect nodes 1 to 6 in sequence to form a closed loop, so that the nodes can distribute power by changing the opening and closing of the contactors on the closed loop. Node 1# is connected to node 4# through high-voltage contactor 7 to form one branch within the loop. Node 2# is connected to node 5# through high-voltage contactor 8 to form another branch within the loop. Node 3# is connected to node 6# through high-voltage contactor 9 to form yet another branch within the loop.

[0044] In this context, non-adjacent nodes refer to nodes that are not directly connected in a ring connection. Taking node 1 as an example, nodes 2 and 6 are adjacent nodes of node 1, while nodes 3, 4, and 5 are non-adjacent nodes. Optionally, node 1 can also be connected to node 3, node 4, or node 5 to form an intra-ring branch. However, in this embodiment, node 1 will not form intra-ring branches with nodes 3, 4, and 5. Instead, the node with the furthest number of steps across the ring will be selected to form an intra-ring branch, which approximates the essence of a diagonal connection. This reduces the number of contactors and allows for the most efficient search for available idle modules in the diagonal direction of the ring for power distribution when adjacent nodes are unavailable. Using ring daisy-chain connections and intra-ring diagonal connections can solve the problems of idle power modules and low utilization efficiency, and also reduce the overall cost of the device.

[0045] Furthermore, in this embodiment, the number of charging modules is N (N>3). When N is even, the i-th charging module (i≤N) is connected to the i+(N / 2)-th charging module through a contactor to form an inner branch. When N is odd, the i-th charging module is connected to the i+((N+1) / 2) or i+((N-1) / 2)-th charging module through a contactor to form an inner branch, and there is any charging module that does not participate in forming an inner branch.

[0046] Specifically, in this embodiment, when there are only 3 nodes, only a ring connection can be formed, and no branching within the ring can be formed. When there are 4 nodes, N=4 is an even number of nodes. The first node connects to the 1+(4 / 2)=3th node through a contactor to form a branching within the ring, the second node connects to the 2+(4 / 2)=4th node through a contactor to form a branching within the ring, and so on. The situation with 6 nodes has already been analyzed above and will not be repeated here. Figure 6 As shown, when there are 7 nodes (N=7 being an odd number of nodes), the first node connects to the 1+((7+1) / 2)=5th node via a contactor to form an inner-loop branch. The second node connects to the 2+((7+1) / 2)=6th node via a contactor to form an inner-loop branch. The third node connects to the 3+((7+1) / 2)=7th node via a contactor to form an inner-loop branch. The fourth node does not participate in forming an inner-loop branch, ultimately forming three inner-loop branches closest to a diagonal connection. Subsequent node topologies follow the same pattern. When there are an even number of nodes in the system, nodes form inner-loop branches diagonally. When there are an odd number of nodes in the system, a pre-defined intermediate node does not participate in forming a diagonal inner-loop branch. The node then forms a pseudo-diagonal inner-loop branch with the node with the furthest step span.

[0047] Furthermore, the charging device also includes a controller; the controller is connected to each high-voltage contactor and low-voltage relay respectively.

[0048] Specifically, the controller operates as follows: it collects the status of each high-voltage contactor and low-voltage relay for individual control. Once the low-voltage relay is detected as closed, the controller then controls the high-voltage contactor to close. This allows the high-voltage contactor to handle any potential instantaneous current, while the low-voltage relay closes with zero arc. When the charging module is released, the controller reduces its current and stops the operation. Afterward, it first controls the high-voltage contactor to disconnect; once this is detected, it then controls the low-voltage relay to disconnect. This allows the high-voltage contactor to interrupt any potential load current, while the low-voltage relay disconnects with zero arc.

[0049] like Figure 7 The diagram shown is a structural schematic of a charging system provided in the third aspect of an embodiment of this utility model. Please refer to [link / reference]. Figure 7 The charging system includes: a charging module group, a charging interface group, and a power distribution unit. The charging module group is electrically connected to the charging interface group through the power distribution unit. The charging module group includes at least one charging module, the charging interface group includes at least one charging interface, and the power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay. The first end of the high-voltage contactor group is electrically connected to the first output end of the charging module group, and the second end of the high-voltage contactor group is electrically connected to the first input end of the charging interface group. The first end of the low-voltage relay group is electrically connected to the second output end of the charging module group, and the second end of the low-voltage relay group is electrically connected to the second input end of the charging interface group.

[0050] Furthermore, each charging module is electrically connected to at least one charging interface via a high-voltage contactor and a low-voltage relay.

[0051] Furthermore, such as Figure 7 As shown, the charging module also includes a control module; the control module is connected to each high-voltage contactor and low-voltage relay respectively.

[0052] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] It should also be noted that, in the present invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power distribution unit, characterized by, include: A high-voltage contactor group and a low-voltage relay group; wherein the high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay; The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group. The first terminal of the low-voltage relay group is used for electrical connection to the second output terminal of the charging module group, and the second terminal of the low-voltage relay group is used for electrical connection to the second input terminal of the charging interface group.

2. A charging device, characterized by, include: The system includes a charging module group, a charging interface group, and a power distribution unit. The charging module group is electrically connected to the charging interface group through the power distribution unit. The charging module group includes at least one charging module, the charging interface group includes at least one charging interface, and the power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay. The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group. The first terminal of the low-voltage relay group is used for electrical connection to the second output terminal of the charging module group, and the second terminal of the low-voltage relay group is used for electrical connection to the second input terminal of the charging interface group.

3. The charging device according to claim 2, characterized in that, Each of the charging modules is electrically connected to at least one of the charging interfaces via a high-voltage contactor, a low-voltage relay, and a first terminal of the high-voltage contactor, which is electrically connected to a first output terminal of one of the charging modules; a second terminal of the high-voltage contactor is electrically connected to a first input terminal of one of the charging interfaces; a first terminal of the low-voltage relay is electrically connected to a second output terminal of one of the charging modules; and a second terminal of the low-voltage relay is electrically connected to a second input terminal of one of the charging interfaces.

4. The charging apparatus according to claim 3, characterized by, Each of the charging modules is electrically connected to each of the charging interfaces via a high-voltage contactor and a low-voltage relay, respectively; wherein there are A charging modules (A>0), B charging interfaces (B>0), and the power distribution unit includes A*B high-voltage contactors and A*B low-voltage relays.

5. The charging apparatus according to claim 3, characterized by, The charging modules are connected in series in a ring via the high-voltage contactor, and each charging module is connected to a non-adjacent charging module via the high-voltage contactor to form a branch within the ring. When the number of charging modules is odd, at least one charging module is pre-selected not to participate in forming the branch within the ring. The non-adjacent charging module is a charging module that is not directly connected to another module on the ring.

6. The charging device according to claim 5, characterized in that, The number of charging modules is N (N>3). When N is even, the i-th charging module (i≤N) is connected to the i+(N / 2)-th charging module through the contactor to form an inner branch of the loop. When N is odd, the i-th charging module forms an inner branch with the i+((N+1) / 2) or i+((N-1) / 2) charging module through the contactor, and there is any charging module that does not participate in forming an inner branch.

7. The charging apparatus according to any one of claims 2 to 6, wherein It also includes a controller; the controller is connected to each of the high-voltage contactors and the low-voltage relays respectively.

8. A charging system, characterized by include: The system includes a charging module group, a charging interface group, and a power distribution unit. The charging module group is electrically connected to the charging interface group through the power distribution unit. The charging module group includes at least one charging module, the charging interface group includes at least one charging interface, and the power distribution unit includes a high-voltage contactor group and a low-voltage relay group. The high-voltage contactor group includes at least one high-voltage contactor, and the low-voltage relay group includes at least one low-voltage relay. The first end of the high-voltage contactor group is used to electrically connect to the first output end of the charging module group, and the second end of the high-voltage contactor group is used to electrically connect to the first input end of the charging interface group. The first terminal of the low-voltage relay group is used for electrical connection to the second output terminal of the charging module group, and the second terminal of the low-voltage relay group is used for electrical connection to the second input terminal of the charging interface group.

9. The charging system of claim 8, wherein, Each of the charging modules is electrically connected to at least one of the charging interfaces via one of the high-voltage contactors and one of the low-voltage relays.

10. The charging system of claim 9, wherein, It also includes a control module; the control module is connected to each of the high-voltage contactors and the low-voltage relays respectively.

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