Charging pile cooperative charging system, control method and control device thereof and computer equipment

Abstract

The invention relates to a charging pile cooperative charging system, a control method and a control device thereof, and computer equipment, and relates to the technical field of electric vehicle charging, the charging pile cooperative charging system comprises a plurality of charging piles, a direct current bus, and a switch unit and a charging and discharging management center arranged on the direct current bus; the charging pile is used for converting alternating current of a power grid into direct current and conducting direct current discharging on the electric vehicle through the direct current output line. The charging piles are electrically connected through a direct current bus and a switch unit; the communication unit is in communication connection with the communication unit of each charging pile, and is used for receiving a cooperative charging request sent by the communication unit of any charging pile when any charging pile cannot meet the charging requirement of the electric vehicle connected with the charging pile, and controlling the corresponding switch unit to be closed; other charging piles with redundant direct-current power are electrically connected with any charging pile through the direct-current bus, direct current is output to the direct-current output line of any charging pile through the direct-current bus so as to carry out cooperative charging on the electric vehicle, and the charging efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle charging, and particularly to a charging pile collaborative charging system, a control method, a control device, and a computer device thereof. Background Art

[0002] In recent years, with the development of the new energy vehicle industry, vehicle-to-grid (V2G) technology has gradually become the focus of the industry. V2G technology can not only achieve the bidirectional energy flow between electric vehicles and the power grid, but also provide strong support for the stable operation and energy optimization of the power grid. However, in the actual application of V2G charging piles, there are some problems in charging management and energy utilization efficiency. In the charging process of traditional V2G charging piles, when the charging demand of the electric vehicle connected to a certain charging pile is large, the charging pile cannot meet the charging demand of the electric vehicle, which limits the charging speed and charging efficiency of the electric vehicle, thus resulting in a low charging efficiency problem. Summary of the Invention

[0003] Based on this, it is necessary to provide a charging pile collaborative charging system, a control method, a control device, a computer device, and a storage medium thereof that can improve charging efficiency for the above technical problems.

[0004] In a first aspect, the present application provides a charging pile collaborative charging system, including:

[0005] A plurality of charging piles, each of the charging piles is provided with a communication unit, the charging pile is used to be electrically connected to the power grid and the electric vehicle, and is also used to convert the alternating current of the power grid into direct current, and perform direct current discharge on the electric vehicle through a direct current output line;

[0006] A direct current bus and a switch unit arranged on the direct current bus, each of the charging piles is electrically connected through the direct current bus and the switch unit;

[0007] A charge and discharge management center, which is communicatively connected to the communication units of each of the charging piles, and is used to, in the case that any one of the charging piles cannot meet the charging demand of the electric vehicle connected thereto, in response to a collaborative charging request sent by the communication unit of any one of the charging piles, control the corresponding switch unit to close, so that other charging piles with surplus direct current power are electrically connected to any one of the charging piles through the direct current bus, and output direct current to the direct current output line of any one of the charging piles through the direct current bus, so as to perform collaborative charging on the electric vehicle connected to any one of the charging piles.

[0008] In one embodiment, the charging pile includes:

[0009] A vehicle-grid interaction module, which is electrically connected to the DC bus, is used to be electrically connected to the power grid and the electric vehicle respectively, and is also used to convert the alternating current of the power grid into direct current based on the charging demand and perform DC discharge on the electric vehicle, or, in the case of collaborative charging at the charging pile, perform DC discharge on the DC bus;

[0010] A charge and discharge control module, the communication unit is arranged in the charge and discharge control module, the communication unit is respectively communicatively connected to the vehicle-grid interaction module and the charge and discharge management center, the charge and discharge control module is used to obtain the charging demand of the electric vehicle connected to the charging pile, control the vehicle-grid interaction module to perform DC discharge on the electric vehicle; and in the case that the charging pile cannot meet the charging demand, send a collaborative charging request to the charge and discharge management center; and in the case of collaborative charging at the charging pile, receive the control instruction sent by the charge and discharge management center and control the vehicle-grid interaction module to perform DC discharge on the DC bus.

[0011] In one embodiment, the vehicle-grid interaction module includes:

[0012] A bidirectional AC-DC conversion module, one end of the bidirectional AC-DC conversion module is electrically connected to the power grid, the other end is electrically connected to the DC bus, and is communicatively connected to the charge and discharge control module, and is used to convert the alternating current of the power grid into direct current, or convert the direct current of the electric vehicle into alternating current;

[0013] A bidirectional DC-DC conversion module, one end of the bidirectional DC-DC conversion module is electrically connected to the bidirectional AC-DC conversion module, the connection point of the bidirectional DC-DC conversion module and the bidirectional AC-DC conversion module is electrically connected to the DC bus through the switch unit, the other end of the bidirectional DC-DC conversion module is electrically connected to the electric vehicle through the switch unit, and is communicatively connected to the charge and discharge control module, and is used to convert the direct current output by the bidirectional AC-DC conversion module into direct current adapted to the charging demand, or, in the case of collaborative charging at the charging pile, convert the direct current output by the electric vehicle into direct current adapted to the control instruction and perform DC discharge on the DC bus.

[0014] In one embodiment, the switch unit includes:

[0015] A first DC contactor, the DC bus is electrically connected to the connection point of the bidirectional DC-DC module and the bidirectional AC-DC module through the first DC contactor, and the first DC contactor is communicatively connected to the charge and discharge control module. The first DC contactor is configured to switch to an off state in response to a control instruction from the charge and discharge control module when the charging pile cannot meet the charging demand of the electric vehicle connected thereto; and to switch to an on state in response to a control instruction from the charge and discharge control module when the charging pile performs collaborative charging.

[0016] A second DC contactor, the DC bus is electrically connected to the electric vehicle through the second DC contactor, and the second DC contactor is communicatively connected to the charge and discharge control module. The first DC contactor is configured to control the conduction between the DC bus and the electric vehicle in response to a control instruction from the charge and discharge control module when the charging pile cannot meet the charging demand of the electric vehicle connected thereto.

[0017] A third DC contactor, the bidirectional DC-DC module is electrically connected to the electric vehicle through the third DC contactor, and the third DC contactor is communicatively connected to the charge and discharge control module for controlling the connection and disconnection between the bidirectional DC-DC module and the electric vehicle in response to a control instruction from the charge and discharge control module.

[0018] In one embodiment, the system further includes:

[0019] A first filter, one end of the first filter is electrically connected to the electric vehicle, and the other end is electrically connected to the end of the second DC contactor away from the DC bus. The first filter is configured to filter the ripple of the direct current output from the connection point of the bidirectional AC-DC module and the bidirectional DC-DC module to the DC bus, or to filter the ripple of the direct current input from the DC bus to the connection point of the bidirectional AC-DC module and the bidirectional DC-DC module.

[0020] A second filter, one end of the second filter is electrically connected to each module of the vehicle-grid interaction, and the other end is electrically connected to the end of the first DC contactor away from the DC bus. The second filter is configured to filter the ripple of the direct current output from the DC bus to the electric vehicle, or to filter the ripple of the direct current input from the electric vehicle to the DC bus.

[0021] In one embodiment, the system further includes:

[0022] A DC measurement device, which is electrically connected to the DC bus and communicatively connected to the charge and discharge management center. The DC measurement device is used to collect the electrical parameters of the DC bus and feedback the electrical parameters of the DC bus to the charge and discharge management center.

[0023] In a second aspect, the present application provides a control method for a charging pile collaborative charging system, which is applied to the charge and discharge management center included in the charging pile collaborative charging system control system according to any one of the above embodiments, and includes:

[0024] Receiving a collaborative charging request sent by any charging pile; the collaborative charging request indicates that the any charging pile cannot meet the charging demand of the electric vehicle connected thereto;

[0025] According to the collaborative charging request, controlling the closing of the corresponding switch units on the DC buses of the any charging pile and other charging piles with surplus DC power, so that the other charging piles with surplus DC power are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus to perform collaborative charging on the electric vehicle connected to the any charging pile.

[0026] In one embodiment, according to the collaborative charging request, controlling the closing of the corresponding switch units on the DC buses of the any charging pile and other charging piles with surplus DC power, so that the other charging piles with surplus DC power are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus, includes:

[0027] According to the collaborative charging request, determining other charging piles with surplus DC power from all the charging piles as collaborative charging piles;

[0028] Controlling the first DC contactor on the DC buses of the any charging pile and the collaborative charging piles to conduct, the second contactor to disconnect, and the third DC contactor to conduct, so that the collaborative charging piles are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus.

[0029] In a third aspect, the present application provides a control device for a charging pile collaborative charging system, which is applied to the charge and discharge management center included in the charging pile collaborative charging system control system according to any one of the above embodiments, and includes:

[0030] A communication module, configured to receive a collaborative charging request sent by any charging pile; the collaborative charging request indicates that the any charging pile cannot meet the charging demand of the electric vehicle connected thereto;

[0031] A regulation module, configured to control a corresponding switch unit on the DC bus of any one of the charging piles and other charging piles with surplus DC power to close according to the collaborative charging request, so that the other charging piles with surplus DC power are electrically connected to any one of the charging piles through the DC bus, and output direct current to the DC output line of any one of the charging piles through the DC bus, so as to perform collaborative charging on the electric vehicle connected to any one of the charging piles.

[0032] In a fourth aspect, the present application provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0033] Receiving a collaborative charging request sent by any one of the charging piles; the collaborative charging request indicates that any one of the charging piles cannot meet the charging requirements of the electric vehicle connected thereto;

[0034] According to the collaborative charging request, controlling a corresponding switch unit on the DC bus of any one of the charging piles and other charging piles with surplus DC power to close, so that the other charging piles with surplus DC power are electrically connected to any one of the charging piles through the DC bus, and output direct current to the DC output line of any one of the charging piles through the DC bus, so as to perform collaborative charging on the electric vehicle connected to any one of the charging piles.

[0035] In a fifth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0036] Receiving a collaborative charging request sent by any one of the charging piles; the collaborative charging request indicates that any one of the charging piles cannot meet the charging requirements of the electric vehicle connected thereto;

[0037] According to the collaborative charging request, controlling a corresponding switch unit on the DC bus of any one of the charging piles and other charging piles with surplus DC power to close, so that the other charging piles with surplus DC power are electrically connected to any one of the charging piles through the DC bus, and output direct current to the DC output line of any one of the charging piles through the DC bus, so as to perform collaborative charging on the electric vehicle connected to any one of the charging piles.

[0038] The above charging pile collaborative charging system, its control method, control device, computer equipment and storage medium. The system includes multiple charging piles, a DC bus, and a switch unit and a charge and discharge management center arranged on the DC bus; each charging pile is provided with a communication unit. The charging pile is used to be electrically connected to the power grid and the electric vehicle, and is also used to convert the alternating current of the power grid into direct current, and perform DC discharge on the electric vehicle through a DC output line; the charging piles are electrically connected through the DC bus and the switch unit; it is communicatively connected to the communication units of the charging piles, and is used to, in the case that any one of the charging piles cannot meet the charging requirements of the electric vehicle connected thereto, in response to a collaborative charging request sent by the communication unit of any one of the charging piles, control the corresponding switch unit to close, so that other charging piles with surplus DC power are electrically connected to any one of the charging piles through the DC bus, and output direct current to the DC output line of any one of the charging piles through the DC bus, so as to perform collaborative charging on the electric vehicle connected to any one of the charging piles. It realizes the power sharing output of multiple charging piles, improves the energy utilization rate, and avoids the problem of too long charging time caused by the charging pile connected to the electric vehicle not being able to meet its charging requirements and only charging at a low power, thereby improving the charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic structural diagram of a charging pile collaborative charging system in an embodiment;

[0041] Figure 2 It is a schematic structural diagram of a charging pile collaborative charging system in another embodiment;

[0042] Figure 3 It is a schematic structural diagram of a charging pile collaborative charging system in still another embodiment;

[0043] Figure 4 It is a schematic flowchart of a control method of a charging pile collaborative charging system in an embodiment;

[0044] Figure 5 It is a schematic flowchart of a control method of a charging pile collaborative charging system in another embodiment;

[0045] Figure 6 It is a schematic block diagram of a control device of a charging pile collaborative charging system in an embodiment;

[0046] Figure 7It is the internal structure diagram of a computer device in an embodiment. Detailed implementation manners

[0047] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant accompanying drawings. Embodiments of this application are shown in the accompanying drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of this application more thorough and comprehensive.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0049] It can be understood that the terms "first", "second", etc. used in this application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0050] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In addition, in the following embodiments, "connection", if there is a transmission of electrical signals or data between the connected objects, should be understood as "electrical connection", "communication connection", etc.

[0051] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0052] As described in the background art, the vehicle-grid interactive charging piles in the prior art have the problem of low charging efficiency for electric vehicles. After research by the inventor, it is found that the reason for this problem is that in recent years, with the rapid development of the new energy vehicle industry, vehicle-grid interactive (V2G) technology has gradually become the focus of the industry. V2G technology can not only achieve the bidirectional energy flow between electric vehicles and the power grid, but also provide strong support for the stable operation and energy optimization of the power grid. However, in the actual application of V2G charging piles, there are many severe challenges in charging management and energy utilization efficiency. Unreasonable charging power distribution: In the charging process of traditional V2G charging piles, there is no effective coordination mechanism for power distribution among the charging piles. When multiple electric vehicles are charging simultaneously, there may be a situation where some charging piles are not charging, some vehicles with discharge functions have a very long charging demand completion time and can provide discharge services, while some charging piles have insufficient power, resulting in low overall charging efficiency and unable to fully meet the charging needs of electric vehicles. High energy conversion loss: In the existing V2G charging system, the energy of an electric vehicle during discharge usually needs to be converted multiple times before it can be used to charge other vehicles. The discharge energy is first output to the AC bus through the DC-DC component and the DC-AC component, and then charges other electric vehicles through the AC-DC component and the DC-DC component. A very large amount of energy loss will occur during this process, reducing the energy utilization efficiency. Difficulty in sharing the power of charging devices: Most of the current V2G charging piles operate independently, and it is difficult to share the power among the charging piles. When the charging demand of the electric vehicle connected to a certain charging pile is large, it is impossible to obtain additional power support from other charging piles and the discharge of electric vehicles in a timely manner, restricting the charging speed and charging efficiency of electric vehicles. Communication delay affects charging management: In the V2G charging collaborative power system, communication between multiple charging devices and the monitoring and switching bus controller is crucial for achieving effective charging management. However, the traditional communication method has a certain delay, resulting in the charging devices being unable to respond to the dispatching instructions of the power grid in a timely manner, affecting the accuracy and timeliness of charging management.

[0053] For the above reasons, the present invention provides a charging pile collaborative charging system, aiming to improve the charging efficiency of electric vehicles.

[0054] In one embodiment, as Figure 1 shown, a charging pile collaborative charging system 10 is provided, including a plurality of charging piles 11, a DC bus 12, and a switch unit 121 and a charge and discharge management center 13 provided on the DC bus;

[0055] Among them, each charging pile 11 is provided with a communication unit 111. The charging pile 11 is used for electrically connecting to the power grid and the electric vehicle, and is also used for converting the alternating current of the power grid into direct current, and performing direct current discharge on the electric vehicle through a direct current output line; each charging pile 11 is electrically connected through a direct current bus 12 and a switch unit 121; being communicatively connected to the communication unit of each charging pile 11, and being used for, in the case that any one of the charging piles 11 cannot meet the charging requirements of the electric vehicle connected thereto, in response to a cooperative charging request sent by the communication unit of any one of the charging piles 11, controlling the corresponding switch unit 121 to close, so that other charging piles 11 with surplus direct current power are electrically connected to the direct current bus 12 of any one of the charging piles 11, and outputting direct current to the direct current output line of any one of the charging piles 11 through the direct current bus 12, so as to perform cooperative charging on the electric vehicle connected to any one of the charging piles 11.

[0056] It can be understood that the charging pile 11 is a device for providing electric energy for electric vehicles and other battery-driven vehicles, and the vehicle can be connected to the charging pile 11 through a charging gun. The communication unit of the charging pile 11 can be a wireless communication unit, and wireless communication methods such as 5G communication technology, local area network and Bluetooth can be adopted, and no specific limitation is made thereto, as long as wireless data transceiver can be realized. In addition, the charging management center can be a background server, which can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services, and serves as a control center for distributed management of each charging pile 11.

[0057] It should be noted that the charging demand can be charging parameters determined according to the initial battery-related parameters of the electric vehicle, such as charging power, charging voltage, and charging current. Among them, the initial battery-related parameters include the battery SOC (State of Charge), rated power, allowable charge and discharge voltage, current, power range, allowable charge and discharge SOC range, allowable number of charge and discharge times per day, and when the electric vehicle is in the charging state, the current charge and discharge voltage, current, and power, etc. The DC bus 12 is electrically connected to each charging terminal and the electric vehicle respectively. The switch unit 121 of the DC bus 12 controls the on / off of the electrical connection between the DC bus 12 and each charging terminal, and controls the on / off of the electrical connection between the DC bus 12 and the electric vehicle. Specifically, when the charging demand of the electric vehicle connected to any charging pile 11 cannot be met by this charging pile 11, the switch unit 121 between the electric vehicle connected to this charging pile 11 and the DC bus 12 is turned on. For example, if the charging voltage of the charging demand is higher than the minimum voltage requirement of the charging pile 11, this charging pile 11 sends a collaborative charging request to the charge and discharge management center 13. The charge and discharge management center 13 controls the electrical connection between other charging piles 11 with surplus DC power and the DC bus 12 to be turned on, and controls other charging piles 11 with surplus DC power to output direct current through the DC bus 12 and converge to the electric vehicle connected to any charging pile 11 to achieve collaborative charging.

[0058] In addition, the switch unit 121 is provided in one-to-one correspondence with the charging pile 11, and each charging terminal is connected to the DC bus 12 through a switch unit 121, so as to facilitate the control of the on / off of the electrical connection between each charging pile 11 and the DC bus 12.

[0059] In the above charging pile 11 collaborative charging system, the system includes a plurality of charging piles 11, a DC bus 12, and a switch unit 121 and a charge and discharge management center 13 provided on the DC bus 12; each charging pile 11 is provided with a communication unit, and the charging pile 11 is used for electrically connecting with the power grid and the electric vehicle, and is also used for converting the alternating current of the power grid into direct current, and performing direct current discharge on the electric vehicle through a DC output line; each charging pile 11 is electrically connected through the DC bus 12 and the switch unit 121; being communicatively connected to the communication unit of each charging pile 11, and being used for, in the case that any one of the charging piles 11 cannot meet the charging demand of the electric vehicle connected thereto, in response to a collaborative charging request sent by the communication unit of any one of the charging piles 11, controlling the corresponding switch unit 121 to close, so that other charging piles 11 with surplus DC power are electrically connected to any one of the charging piles 11 through the DC bus 12, and outputting direct current to the DC output line of any one of the charging piles 11 through the DC bus 12, so as to perform collaborative charging on the electric vehicle connected to any one of the charging piles 11. The power sharing output of multiple charging piles 11 is realized, the energy utilization rate is improved, and the problem of too long charging time caused by the charging pile 11 connected to the electric vehicle being unable to meet its charging demand and only being able to charge at a low power is avoided, thereby improving the charging efficiency.

[0060] In one embodiment, as Figure 2 shown, the charging pile 11 includes a vehicle-grid interaction module 112 and a charge and discharge control module 113;

[0061] Among them, the vehicle-grid interaction module 112 is electrically connected to the DC bus 12, and is used for electrically connecting with the power grid and the electric vehicle respectively, and is also used for converting the alternating current of the power grid into direct current based on the charging demand, and performing direct current discharge on the electric vehicle, or, in the case of collaborative charging of the charging pile 11, performing direct current discharge to the DC bus 12; the communication unit is arranged in the charge and discharge control module 113, the communication unit is communicatively connected to the vehicle-grid interaction module 112 and the charge and discharge management center 13 respectively, and the charge and discharge control module 113 is used for obtaining the charging demand of the electric vehicle connected to the charging pile 11, controlling the vehicle-grid interaction module 112 to perform direct current discharge on the electric vehicle; and in the case that the charging pile 11 cannot meet the charging demand, sending a collaborative charging request to the charge and discharge management center 13; and in the case of collaborative charging of the charging pile 11, receiving a control instruction sent by the charge and discharge management center 13, and controlling the vehicle-grid interaction module 112 to perform direct current discharge to the DC bus 12.

[0062] It can be understood that the vehicle-grid interaction module 112 can be a module with V2G (Vehicle to Grid) function, which can not only convert alternating current to direct current, but also convert direct current to alternating current. When the electric vehicle has a charging demand, the charge and discharge control module 113 responds to the charging demand and converts the alternating current output by the power grid into direct current and transmits it to the electric vehicle. When the power grid has a power demand, the charge and discharge control module 113 responds to the power demand and converts the direct current output by the electric vehicle into alternating current and transmits it to the power grid. Thus, the burden on the power grid is reduced, the power energy scheduling between the vehicle and the grid is realized, and the waste of resources is reduced.

[0063] It should be noted that the implementation manner of the charge and discharge control module 113 is not limited to a microcontroller, a digital signal processor, a field programmable gate array, or an industrial computer module, as long as it can implement functions such as communication, data processing, and real-time control.

[0064] In one embodiment, referring to Figure 2 , the vehicle-grid interaction module 112 includes: a bidirectional AC-DC conversion module 1121 and a bidirectional DC-DC conversion module 1122;

[0065] Among them, one end of the bidirectional AC-DC conversion module 1121 is electrically connected to the power grid, the other end is electrically connected to the DC bus 12, and is communicatively connected to the charge and discharge control module 113, and is used to convert the alternating current of the power grid into direct current, or convert the direct current of the electric vehicle into alternating current; one end of the bidirectional DC-DC conversion module 1122 is electrically connected to the bidirectional AC-DC conversion module 1121, the connection point between the bidirectional DC-DC conversion module 1122 and the bidirectional AC-DC conversion module 1121 is electrically connected to the DC bus 12 through the switch unit 121, the other end of the bidirectional DC-DC conversion module 1122 is electrically connected to the electric vehicle through the switch unit 121, and is communicatively connected to the charge and discharge control module 113, and is used to convert the direct current output by the bidirectional AC-DC conversion module 1121 into direct current adapted to the charging demand, or, in the case of collaborative charging by the charging pile 11, convert the direct current output by the electric vehicle into direct current adapted to the control command and perform DC discharge to the DC bus 12.

[0066] It can be understood that the bidirectional AC-DC module 1121 can be a bidirectional AC-DC (Alternating Current to Direct Current) module, capable of realizing bidirectional conversion between alternating current and direct current. The bidirectional DC-DC module 1122 can be a bidirectional DC-DC (Direct Current to Direct Current Converter) module, which can convert one type of direct current into another type of direct current. In the system, vehicle-grid interaction can be achieved. When the electric vehicle is being charged, the bidirectional DC-DC module 1122 is used to convert the direct current output by the bidirectional AC-DC module 1121 of the inverter cabinet into a direct current adapted to the charging demand and charge the electric vehicle. When there is an electricity demand in the power grid and the electric vehicle needs to discharge, the bidirectional DC-DC module 1122 is used to convert the direct current output by the electric vehicle into a direct current adapted to the electricity demand, and then the bidirectional AC-DC module 1121 in the inverter cabinet converts the direct current output by the bidirectional DC-DC module 1122 into alternating current and outputs the alternating current to the power grid.

[0067] In this embodiment, the bidirectional flow between the electric vehicle and the power grid realized by this charging pile 11 can improve the flexibility and stability of the power grid. Through intelligent scheduling, the battery of the electric vehicle can be charged when the electricity price is low and supply power to the power grid when the electricity price is high, thereby optimizing the use of electricity and reducing the electricity bill expenditure of users. During peak power demand, electric vehicles can provide additional power to the power grid, relieve the pressure on traditional power sources, and improve the load capacity of the power grid. The application of the bidirectional AC-DC module 1121 and the bidirectional DC-DC module 1122 makes the design of the charging pile 11 more flexible, capable of adapting to different charging standards and power grid requirements, and having higher scalability.

[0068] In one embodiment, continue to refer to Figure 2 , the switch unit 121 includes: a first DC contactor 1111, a second DC contactor 1112, and a third DC contactor 1113;

[0069] The DC bus 12 is electrically connected to the connection point of the bidirectional DC-DC module 1122 and the bidirectional AC-DC module 1121 through the first DC contactor 1111, and the first DC contactor 1111 is communicatively connected to the charge and discharge control module 113. The first DC contactor 1111 is configured to switch to the off state in response to the control instruction of the charge and discharge control module 113 when the charging pile 11 cannot meet the charging requirements of the electric vehicle connected thereto; and to switch to the on state in response to the control instruction of the charge and discharge control module 113 when the charging pile 11 performs cooperative charging; the DC bus 12 is electrically connected to the electric vehicle through the second DC contactor 1112, and the second DC contactor 1112 is communicatively connected to the charge and discharge control module 113. The first DC contactor 1111 is configured to control the conduction between the DC bus 12 and the electric vehicle in response to the control instruction of the charge and discharge control module 113 when the charging pile 11 cannot meet the charging requirements of the electric vehicle connected thereto; the bidirectional DC-DC module 1122 is electrically connected to the electric vehicle through the third DC contactor 1113, and the third DC contactor 1113 is communicatively connected to the charge and discharge control module 113 for controlling the on / off between the bidirectional DC-DC module 1122 and the electric vehicle in response to the control instruction of the charge and discharge control module 113.

[0070] It should be noted that when the electric vehicle is connected to the charging pile 11 and needs to be charged and the charging pile 11 can meet the charging requirements of the charging pile 11, the charge and discharge control module 113 controls the third DC contactor 1113 to conduct and controls the first DC contactor 1111 and the second DC contactor 1112 to disconnect; when the electric vehicle is connected to the charging pile 11 and needs to be charged and the charging pile 11 cannot meet the charging requirements of the charging pile 11, the charge and discharge control module 113 controls the second DC contactor 1112 and the third DC contactor 1113 to conduct and controls the first DC contactor 1111 to disconnect; when the electric vehicle is connected to the charging pile 11 and is in a state of being able to discharge or the charging pile 11 has surplus DC power and receives the control instruction corresponding to the cooperative charging request issued by the charging and discharging control center, the charge and discharge control module 113 controls the first DC contactor 1111 and the third DC contactor 1113 to conduct and controls the second DC contactor 1112 to disconnect.

[0071] It can be understood that the DC bus 12 is connected to the connection point between the bidirectional AC-DC module 1121 and the bidirectional DC-DC module 1122 through the first DC contactor 1111, and the DC bus 12 is connected to the electric vehicle through the third contactor point. When the charging pile 11 conducts collaborative charging, the direct current output by the electric vehicle is output to the DC bus 12 through the bidirectional DC-DC module 1122, and then the DC bus 12 directly outputs the direct current to the electric vehicle that needs to be collaboratively charged; there is no need for the direct current output by the electric vehicle to pass through the bidirectional DC-DC module 1122 and then to the bidirectional AC-DC module 1121 and output to the power grid, and then the power grid outputs the alternating current to the charging pile 11 of the electric vehicle that needs to be collaboratively charged for AC-DC conversion, reducing the number of AC-DC conversions, thus avoiding energy loss and further improving the charging efficiency.

[0072] In addition, with the setting of the third DC contactor, during the process of inserting / removing the charging gun of the charging terminal into / from the electric vehicle, the third DC contactor 1113 is disconnected to avoid sparks or equipment damage caused by hot plugging of the low-voltage circuit. If abnormal communication of the electric vehicle is detected (such as no response from the BMS), the third DC contactor 1113 remains disconnected to prevent the charging pile 11 from continuing to supply power and avoid ineffective energy consumption or potential risks.

[0073] In one embodiment, as Figure 3 shown, the collaborative charging system of the charging pile 11 further includes a first filter 14 and a second filter 15;

[0074] Among them, one end of the first filter 14 is electrically connected to the electric vehicle, and the other end is electrically connected to the end of the second DC contactor 1112 away from the DC bus 12. The first filter 14 filters the ripple of the direct current output from the connection point between the bidirectional AC-DC module 1121 and the bidirectional DC-DC module 1122 to the DC bus 12, or filters the ripple of the direct current input from the DC bus 12 to the connection point between the bidirectional AC-DC module 1121 and the bidirectional DC-DC module 1122; one end of the second filter 15 is electrically connected to each module of the vehicle-grid interaction, and the other end is electrically connected to the end of the first DC contactor 1111 away from the DC bus 12. The second filter 15 is used to filter the ripple of the direct current output from the DC bus 12 to the electric vehicle, or filters the ripple of the direct current input from the electric vehicle to the DC bus 12.

[0075] It can be understood that the filter can be an LC filter, an RC filter, etc., and the type of filter and the specifications of components can be selected according to the actual anti-interference requirements, and no specific limitation is made thereto. During the transmission process of direct current from the connection between the bidirectional AC-DC conversion module 1121 and the bidirectional DC-DC conversion module 1122 to the DC bus 12, and during the transmission process between the DC bus 12 and the electric vehicle, electromagnetic interference will be generated, mainly manifested as voltage spikes and current ripples. The settings of the first filter 14 and the second filter 15 can filter out the high-frequency electromagnetic interference generated during the transmission of direct current, preventing the interference from being conducted to the vehicle-grid interaction module 112 or the electric vehicle, thereby protecting the equipment safety of the vehicle-grid interaction module 112 and the electric vehicle.

[0076] It should be noted that a third filter can also be provided on the electrical connection line between the third current contactor and the electric vehicle to filter out the interference noise generated when the third current contactor is turned on and off.

[0077] In one embodiment, referring to Figure 2 and Figure 3 , the charging pile 11 collaborative charging system further includes:

[0078] A DC measurement device 16, which is electrically connected to the DC bus 12 and communicatively connected to the charge and discharge management center 13. The DC measurement device 16 is used to collect the electrical parameters of the DC bus 12 and feedback the electrical parameters of the DC bus 12 to the charge and discharge management center 13.

[0079] It can be understood that the electrical parameters of the DC bus 12 include voltage, current, power, etc. The DC measurement device 16 can be a terminal integrating a voltage sensor, a current sensor, a power meter, a data acquisition system, and a communication module. The DC measurement device 16 feeds the collected electrical parameters back to the charge and discharge management center 13. The charge and discharge management center 13 can adjust the charge and discharge conditions of each charging terminal according to the electrical parameters of the DC bus 12 and the electrical parameters sent by each charging pile 11 and monitor whether there is any abnormality in the whole system. If there is an abnormality, it can send a warning to the technical personnel for timely maintenance, further improving the reliability and safety of the charging pile 11 collaborative charging system.

[0080] In one embodiment, as Figure 4 shown, a control method for a charging pile collaborative charging system is provided, which is applied to the charge and discharge management center 13 included in the charging pile collaborative charging system described in any one of the above embodiments. The method includes:

[0081] Step S402, receiving a collaborative charging request sent by any charging pile.

[0082] Among them, the collaborative charging request indicates that any charging pile cannot meet the charging requirements of the electric vehicle connected to it. The collaborative charging requirements may include the electrical parameters of the charging pile and the charging requirements of the electric vehicle to assist the charge and discharge management center in calculating and making decisions.

[0083] Optionally, the charge and discharge management center receives the collaborative charging request sent by the charging pile, calculates the additional charging voltage, charging current or charging power required to meet the charging requirements of the electric vehicle connected to the charging pile, and lays the foundation for determining the charging piles that can collaborate in charging later.

[0084] Step S404: According to the collaborative charging request, control the corresponding switch unit on the DC bus of any charging pile and other charging piles with excess DC power to close, so that the other charging piles with excess DC power are electrically connected to any charging pile through the DC bus, and output direct current to the DC output line of any charging pile through the DC bus to perform collaborative charging on the electric vehicle connected to any charging pile.

[0085] Among them, the DC power can refer to the power corresponding to the product of the DC voltage and the DC current in the DC circuit.

[0086] Among them, collaborative charging can refer to the operation of at least two charging piles charging the same electric vehicle.

[0087] Optionally, the charge and discharge management center controls the corresponding switch unit on the DC bus to close according to the collaborative charging request, so that the other charging piles with excess DC power are electrically connected to any charging pile through the DC bus, and outputs direct current from the other charging piles with excess DC power to the DC output line of any charging pile through the DC bus to perform collaborative charging on the electric vehicle connected to any charging pile.

[0088] In this embodiment, collaborative charging among multiple charging piles can enable the charging piles with excess DC power to support the charging piles with heavy loads, thereby improving the overall charging efficiency of the charging piles. Through intelligent management, the output power of different charging piles can be dynamically adjusted to meet the immediate needs of electric vehicles and reduce waiting time.

[0089] In one embodiment, the content of step S404 of controlling the corresponding switch unit on the DC bus of any charging pile and other charging piles with excess DC power to close according to the collaborative charging request, so that the other charging piles with excess DC power are electrically connected to any charging pile through the DC bus, and output direct current to the DC output line of any charging pile through the DC bus includes:

[0090] According to the collaborative charging request, determine other charging piles with surplus DC power from all charging piles as collaborative charging piles; control the first DC contactor on the DC bus of any charging pile and the collaborative charging pile to conduct, the second contactor to disconnect, and the third DC contactor to conduct, so that the collaborative charging pile is electrically connected to any charging pile through the DC bus, and DC power is output to the DC output line of any charging pile through the DC bus.

[0091] Among them, the collaborative charging pile can be a charging pile to which the connected electric vehicle is in a discharging state or an idle state, and can be used for collaborative charging.

[0092] Optionally, the charge and discharge management center determines other charging piles with surplus DC power from all charging piles as collaborative charging piles according to the collaborative charging request and the real-time electrical parameters of each charging pile in the system. Further, the charge and discharge management center controls the first DC contactor on the DC loop connecting the DC bus and the collaborative charging pile to conduct, the second contactor to disconnect, and the third DC contactor to conduct, so that the collaborative charging pile is electrically connected to any charging pile through the DC bus, and DC power is output to the DC output line of any charging pile through the DC bus.

[0093] In this embodiment, by setting multiple DC contactors in the DC loop and controlling the on-off of different DC loops, the collaborative charging of electric vehicles among multiple charging piles can be realized, enabling those charging piles with surplus DC power to support the charging piles with heavy loads, thereby improving the overall charging efficiency of the charging piles.

[0094] In one embodiment, as Figure 5 shown, another control method for the charging pile collaborative charging system is provided, which is also applied to the charging pile collaborative charging system described in any one of the above embodiments, including:

[0095] Step 10, the electric vehicle accesses the V2G charging pile, and the charging terminal establishes a connection with the electric vehicle.

[0096] Step 20, the charge and discharge management unit (charge and discharge management module) of the 5G communication module built in the charging terminal (charging pile) obtains the initial parameters related to the electric vehicle battery, such as the battery SOC (state of charge), rated power, allowable charge and discharge voltage, current, power range, allowable charge and discharge SOC range, and the allowable number of charge and discharge times per day, etc.

[0097] Step 30, the charging terminal determines whether the charging voltage required by the electric vehicle is higher than the minimum voltage requirement of the AC-DC part in the charging module: if it is higher, go to step 40; if it is not higher, charge the electric vehicle through the AC-DC and DC-DC modules of the V2G charging pile according to the conventional charging process, and continuously monitor the charging status, and return to step 30 for cyclic judgment.

[0098] Step 40: The charging terminal reports the demand to the 5G communication module charge and discharge management unit (charge and discharge management center) that monitors the DC bus. This management unit determines whether there is redundant DC power that can be switched on or off at the adjacent charging pile based on the power status of each charging pile in the current system and the relevant parameter information of the electric vehicle (obtained from the V2G charging pile through 5G communication).

[0099] Step 50: If the evaluation meets the switching conditions, the charging terminal with redundant DC power (not charging or the vehicle can discharge) controls the DC contactor bank 1# (the first DC contactor) to act, and switches the DC power of the adjacent charging pile to the DC bus.

[0100] Step 60: The DC power output for charging the electric vehicle is collected through the DC bus and output to the DC output power loop connecting the V2G charging pile and the electric vehicle to charge the electric vehicle.

[0101] In this embodiment, in terms of system construction, a DC connection loop is led out from the connection points of the AC-DC and DC-DC components of the modules of multiple V2G charging piles, and a DC bus is built. In terms of charging scheduling, when the charging voltage required by the electric vehicle is higher than the minimum voltage requirement of the AC-DC component in the charging module, the DC power of the adjacent charging pile can be directly switched to the DC bus, and the charging is realized by collecting and outputting through the DC bus to the DC output power loop connecting the V2G charging pile and the electric vehicle. At the same time, the charging vehicle can directly discharge to the DC-DC module and output to the DC bus, rather than passing through the DC-DC to the DC-AC component and outputting to the AC bus and then supplying the charging equipment for AC-DC and DC-DC conversion to the electric vehicle with charging requirements. In terms of communication, a 5G communication module is built-in to ensure the timeliness and accuracy of information interaction and realize the effective regulation of the charge and discharge process. In addition, this system and method improve the charging power of the electric vehicle, greatly improve the charging efficiency, reduce the number of energy conversions, improve the energy utilization rate, and reduce the conversion loss. It realizes the power sharing output of multiple V2G charging devices, and reduces the loss of the energy coordination of the electric vehicle charging and discharging through the DC bus. This solution effectively solves many problems in the field of electric vehicle charging. Without the need for large-scale equipment replacement, it optimizes the charging resource allocation, reduces the operation cost, and has great practical value in the field of charging pile power scheduling.

[0102] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless specifically stated herein, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in rotation with at least some of the steps or stages in other steps or other steps.

[0103] Based on the same inventive concept, an embodiment of the present application further provides a control device for a charging pile collaborative charging system for implementing the control method of the charging pile collaborative charging system described above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the control device for the charging pile collaborative charging system provided below can refer to the limitations on the control method of the charging pile collaborative charging system in the above text, and will not be repeated here.

[0104] In one embodiment, as Figure 6 shown, a control device 600 for a charging pile collaborative charging system is provided, including: a communication module 601 and a regulation module 602, where:

[0105] The communication module 601 is configured to receive a collaborative charging request sent by any charging pile; the collaborative charging request indicates that there is any charging pile that cannot meet the charging demand of the electric vehicle connected to it.

[0106] The regulation module 602 is configured to, according to the collaborative charging request, control the closing of the corresponding switch unit on the DC bus of any charging pile and other charging piles with redundant DC power, so that other charging piles with redundant DC power are electrically connected to any charging pile through the DC bus, and output direct current to the DC output line of any charging pile through the DC bus to perform collaborative charging on the electric vehicle connected to any charging pile.

[0107] Further, in one embodiment, the regulation module 602 is further configured to, according to the collaborative charging request, determine other charging piles with redundant DC power from all charging piles as collaborative charging piles; control the first DC contactor on the DC bus of any charging pile and the collaborative charging pile to conduct, the second contactor to disconnect, and the third DC contactor to conduct, so that the collaborative charging pile is electrically connected to any charging pile through the DC bus, and output direct current to the DC output line of any charging pile through the DC bus.

[0108] Each module in the control device 600 of the above charging pile collaborative charging system can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or stored in a memory in the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0109] In one embodiment, a computer device is provided. The computer device can be a server, and its internal structural diagram can be as Figure 7 shown. The computer device includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store charging requirements, collaborative charging requests, and relevant data of each charging pile. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a control method for a charging pile collaborative charging system.

[0110] Those skilled in the art can understand that Figure 7 the structure shown in

[0111] is only a block diagram of a part of the structure related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0112] In one embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in each of the above method embodiments are implemented.

[0112] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in each of the above method embodiments are implemented.

[0113] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in each of the above method embodiments are implemented.

[0114] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0115] In the description of this specification, the description referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0116] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, 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, it should be considered as the scope described in this specification.

[0117] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A charging pile collaborative charging system, characterized in that, Comprising: A plurality of charging piles, each charging pile is provided with a communication unit, the charging pile is used for electrically connecting with the power grid and the electric vehicle, and is also used for converting the alternating current of the power grid into direct current, and performing direct current discharge on the electric vehicle through a direct current output line; A direct current bus and a switching unit arranged on the direct current bus, and each charging pile is electrically connected through the direct current bus and the switching unit; A charge and discharge management center, which is communicatively connected to the communication units of each charging pile, and is used for, when any one of the charging piles cannot meet the charging demand of the electric vehicle connected thereto, in response to a cooperative charging request sent by the communication unit of the any one charging pile, controlling the corresponding switching unit to close, so that other charging piles with surplus direct current power are electrically connected to the any one charging pile through the direct current bus, and outputting direct current to the direct current output line of the any one charging pile through the direct current bus, so as to perform cooperative charging on the electric vehicle connected to the any one charging pile.

2. The charging pile collaborative charging system according to claim 1, wherein The charging pile includes: A vehicle-grid interaction module, the vehicle-grid interaction module is electrically connected to the direct current bus, and is used for electrically connecting with the power grid and the electric vehicle respectively, and is also used for converting the alternating current of the power grid into direct current based on the charging demand and performing direct current discharge on the electric vehicle, or, in the case of the charging pile performing cooperative charging, discharging direct current to the direct current bus; A charge and discharge control module, the communication unit is arranged in the charge and discharge control module, the communication unit is communicatively connected to the vehicle-grid interaction module and the charge and discharge management center respectively, the charge and discharge control module is used for obtaining the charging demand of the electric vehicle connected to the charging pile, controlling the vehicle-grid interaction module to perform direct current discharge on the electric vehicle; and in the case that the charging pile cannot meet the charging demand, sending a cooperative charging request to the charge and discharge management center; and in the case of the charging pile performing cooperative charging, receiving a control instruction sent by the charge and discharge management center, and controlling the vehicle-grid interaction module to discharge direct current to the direct current bus.

3. The charging pile collaborative charging system according to claim 2, wherein The vehicle-grid interaction module includes: A bidirectional AC-DC conversion module, one end of the bidirectional AC-DC conversion module is electrically connected to the power grid, the other end is electrically connected to the direct current bus, and is communicatively connected to the charge and discharge control module, and is used for converting the alternating current of the power grid into direct current, or converting the direct current of the electric vehicle into alternating current; Bidirectional DC-DC module, one end of the bidirectional DC-DC module is electrically connected to the bidirectional AC-DC module, the connection point of the bidirectional DC-DC module and the bidirectional AC-DC module is electrically connected to the DC bus through the switch unit, the other end of the bidirectional DC-DC module is electrically connected to the electric vehicle through the switch unit, and is communicatively connected to the charge and discharge control module, for converting the direct current output by the bidirectional AC-DC module into a direct current adapted to the charging demand, or, in the case of collaborative charging at the charging pile, converting the direct current output by the electric vehicle into a direct current adapted to the control instruction and discharging the direct current to the DC bus.

4. The charging pile collaborative charging system according to claim 3, wherein The switch unit includes: A first DC contactor, the DC bus is electrically connected to the connection point of the bidirectional DC-DC module and the bidirectional AC-DC module through the first DC contactor, and the first DC contactor is communicatively connected to the charge and discharge control module. The first DC contactor is used to switch to the off state in response to the control instruction of the charge and discharge control module when the charging pile cannot meet the charging demand of the electric vehicle connected thereto; and in the case of collaborative charging at the charging pile, switch to the on state in response to the control instruction of the charge and discharge control module; A second DC contactor, the DC bus is electrically connected to the electric vehicle through the second DC contactor, and the second DC contactor is communicatively connected to the charge and discharge control module. The first DC contactor is used to control the conduction between the DC bus and the electric vehicle in response to the control instruction of the charge and discharge control module when the charging pile cannot meet the charging demand of the electric vehicle connected thereto; A third DC contactor, the bidirectional DC-DC module is electrically connected to the electric vehicle through the third DC contactor, and the third DC contactor is communicatively connected to the charge and discharge control module for controlling the connection and disconnection between the bidirectional DC-DC module and the electric vehicle in response to the control instruction of the charge and discharge control module.

5. The charging pile collaborative charging system according to claim 4, wherein The system further includes: A first filter, one end of the first filter is electrically connected to the electric vehicle, and the other end is electrically connected to the end of the second DC contactor away from the DC bus. The first filter is used to filter the ripple of the direct current output from the connection point of the bidirectional AC-DC module and the bidirectional DC-DC module to the DC bus, or filter the ripple of the direct current input from the DC bus to the connection point of the bidirectional AC-DC module and the bidirectional DC-DC module; A second filter, one end of the second filter is electrically connected to each module of the vehicle-grid interaction, and the other end is electrically connected to the end of the first DC contactor away from the DC bus. The second filter is used to filter the ripple of the direct current output from the DC bus to the electric vehicle, or filter the ripple of the direct current input from the electric vehicle to the DC bus.

6. The charging pile collaborative charging system according to claim 1, wherein The system further includes: A DC measurement device, which is electrically connected to the DC bus and communicatively connected to the charge and discharge management center. The DC measurement device is used to collect the electrical parameters of the DC bus and feedback the electrical parameters of the DC bus to the charge and discharge management center.

7. A control method for a collaborative charging system of charging piles, characterized in that, Applied to the charge and discharge management center included in the charging pile collaborative charging system according to any one of claims 1 to 6, comprising: Receiving a collaborative charging request sent by any charging pile; the collaborative charging request indicates that the any charging pile cannot meet the charging demand of the electric vehicle connected thereto; According to the collaborative charging request, controlling the corresponding switch unit on the DC bus of the any charging pile and other charging piles with surplus DC power to close, so that the other charging piles with surplus DC power are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus to perform collaborative charging on the electric vehicle connected to the any charging pile.

8. The control method of the charging pile collaborative charging system according to claim 7, wherein, The controlling the corresponding switch unit on the DC bus of the any charging pile and other charging piles with surplus DC power to close, so that the other charging piles with surplus DC power are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus includes: According to the collaborative charging request, determining other charging piles with surplus DC power from all the charging piles as collaborative charging piles; Controlling the first DC contactor on the DC bus of the any charging pile and the collaborative charging piles to conduct, the second contactor to disconnect, and the third DC contactor to conduct, so that the collaborative charging piles are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus.

9. A control device for a charging pile collaborative charging system, characterized in that, Applied to the charge and discharge management center included in the charging pile collaborative charging system according to any one of claims 1 to 6, comprising: A communication module, configured to receive a collaborative charging request sent by any charging pile; the collaborative charging request indicates that the any charging pile cannot meet the charging demand of the electric vehicle connected thereto; A regulation module, configured to control the corresponding switch unit on the DC bus of the any charging pile and other charging piles with surplus DC power to close according to the collaborative charging request, so that the other charging piles with surplus DC power are electrically connected to the any charging pile through the DC bus, and outputting direct current to the DC output line of the any charging pile through the DC bus to perform collaborative charging on the electric vehicle connected to the any charging pile.

10. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 7 to 8 are implemented.

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