Charging system

Abstract

The embodiment of the utility model discloses a charging system. The charging system comprises a plurality of mutually connected charging piles. The charging pile comprises an output DC bus; the first output interface is electrically connected with the output direct current bus and is configured to be electrically connected with a vehicle to be charged; the second output interface is electrically connected with the output direct current bus and is configured to be electrically connected with the second output interfaces of other charging piles; the number of the second output interfaces of each charging pile is two, and at least one second output interface of each charging pile is connected with one second output interface of the other charging pile; the second output interface further comprises a second communication wire which is configured to be electrically connected with the second communication wires of other charging piles. The charging pile has the beneficial effects that electric energy from other charging piles can be received, and the output power of the charging pile is improved.

Description

Technical Field

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

[0002] In order to accelerate the planning and construction of charging infrastructure, comprehensively improve the charging guarantee capacity of new energy vehicles, and promote the implementation of the "Guiding Opinions of the General Office of the State Council on Further Building a High-Quality Charging Infrastructure System" Guobanfa

[2023] No. 19. In accordance with the requirements of the "Guiding Opinions of the General Office of the State Council on Accelerating the Construction of Electric Vehicle Charging Infrastructure", the National Development and Reform Commission, the National Energy Administration, the Ministry of Industry and Information Technology, and the Ministry of Finance have formulated the "Action Plan for Improving the Charging Guarantee Capability of New Energy Vehicles". The market promotion of electric vehicles is strong, and the corresponding demand for electric vehicle charging has also increased rapidly. Electric vehicles are equipped with new fast-charging batteries, which increase the range and the on-board storage capacity of electric vehicles. For example, electric vehicles with a range of more than 1,000 kilometers are on the market, and their single-vehicle on-board storage capacity exceeds 150kWH. Electric vehicles with large-capacity on-board storage capacity have gradually increased their demand for ultra-fast charging.

[0003] The current new infrastructure projects have built many electric vehicle slow charging stations in the community, and real estate developers have also built many charging piles in the newly developed real estate projects. These are all AC charging piles, and the output power of a single pile is about 7KW (voltage AC220V*current 32A). There is still a part of the loss when AC power is converted into DC power during the charging process, and the loss ratio is about 6%. In addition, the electric vehicle onboard charger uses liquid cooling and vehicle-side charging control during the charging process due to its installation space reasons, which all consume some electricity. Therefore, usually a 7KW AC charging pile charges an electric vehicle, and the effective charging per hour is about 6.6KWH. It takes a long time for a large-capacity power storage vehicle to be fully charged. For example, the time required to charge a 7KW AC charging pile with a storage capacity of 150KWH is: 150KWH / 6.6KW=22.72H. In addition, some large-capacity power storage vehicles do not have an AC slow charging interface and cannot be charged using an AC charging pile. Therefore, the 7KW AC charging piles in communities and real estate projects cannot meet the needs of fast charging of vehicles. Utility Model Content

[0004] The main purpose of the utility model is to provide a charging system, aiming to solve the above problems existing in the prior art.

[0005] To achieve the above object, the utility model provides a charging system, comprising:

[0006] Multiple charging stations;

[0007] The charging pile comprises:

[0008] Output DC bus;

[0009] A first output interface, electrically connected to the output DC bus, configured to be electrically connected to a vehicle to be charged;

[0010] A second output interface, electrically connected to the output DC bus, configured to be electrically connected to the second output interface of another charging pile;

[0011] The number of the second output interfaces of the charging pile is two, and at least one second output interface of each charging pile is connected to one second output interface of another charging pile;

[0012] The second output interface also includes:

[0013] The second communication wire is configured to be electrically connected to the second communication wire of other charging piles.

[0014] In some embodiments,

[0015] The charging pile also includes:

[0016] a first output switch, electrically connected between the output DC bus and the first output interface;

[0017] A first output control module, connected to control the first output switch;

[0018] a second output switch, electrically connected between the output DC bus and the second output interface;

[0019] The second output control module is connected to control the second output switch.

[0020] In some embodiments,

[0021] The first output interface comprises:

[0022] Ground protection line;

[0023] A first positive and negative wire, electrically connected between the output DC bus and the charging interface, to serve as a path for transmitting electric energy to the vehicle to be charged;

[0024] The first communication wire is configured to be electrically connected to the battery management system of the vehicle to be charged.

[0025] In some embodiments,

[0026] The second output interface comprises:

[0027] Ground protection line;

[0028] The second positive and negative wires are electrically connected to the output DC bus and are configured to be electrically connected to the second positive and negative wires of other charging piles.

[0029] In some embodiments,

[0030] The charging pile also includes:

[0031] a power input terminal configured to be electrically connected to a power grid;

[0032] An active power factor correction module, electrically connected to the power input terminal;

[0033] A two-level full-bridge LLC circuit module, electrically connected to the active power factor correction module;

[0034] The bridge rectifier circuit module is electrically connected between the two-level full-bridge LLC circuit module and the output DC bus.

[0035] In some embodiments,

[0036] The charging pile also includes:

[0037] An electric energy metering processing module, electrically connected to the electric energy metering sampling module;

[0038] A front-stage PFC control module, configured to control the active power factor correction module;

[0039] A two-level full-bridge LLC control module, configured to control the two-level full-bridge LLC circuit module;

[0040] The rectifier output control module is configured to control the rectifier output switch.

[0041] In some embodiments,

[0042] The charging pile also includes:

[0043] An electric energy metering sampling module, electrically connected to the power input terminal;

[0044] An energy storage / filter inductor, electrically connected between the electric energy metering sampling module and the active power factor correction module;

[0045] A filter inductor / capacitor, electrically connected to the bridge rectifier circuit module;

[0046] A rectifier output switch, electrically connected between the filter inductor / capacitor and the output DC bus;

[0047] A rectifier output current acquisition module, configured to acquire the current at the output end of the bridge rectifier circuit module;

[0048] A rectifier output voltage acquisition module, configured to acquire the voltage at the output end of the bridge rectifier circuit module;

[0049] A first output voltage acquisition module, configured to acquire the charging voltage of the first output interface;

[0050] The second output voltage acquisition module is configured to acquire the charging voltage of the second output interface.

[0051] In some embodiments,

[0052] The charging pile also includes:

[0053] a first cable, electrically connected between the first output interface and the charging interface;

[0054] The charging system further comprises:

[0055] The second cable is configured to electrically connect the second output interface of one of the charging piles with the second output interface of another of the charging piles.

[0056] In some embodiments,

[0057] The second communication conductor The second communication conductor The charging pile is configured to send a support request to other charging piles through the second communication conductor when it has a charging task; when it does not have a charging task, respond to the support request of the target charging pile and transmit electric energy to the output DC bus of the target charging pile through its own second output interface.

[0058] In some embodiments,

[0059] The charging system also includes a control platform;

[0060] The charging pile also includes a communication module;

[0061] The communication module is configured to be communicatively connected with the control platform.

[0062] The charging pile proposed in this application transmits the electric energy on the output DC bus to the charging interface through the first output interface, so that the vehicle to be charged can be charged after connecting to the charging interface. In addition, the charging pile can also receive electric energy from other charging piles through the second output interface, so that the charging pile can increase the output power of its own output DC bus. It can be understood that the electric energy of the charging pile can also be transmitted to the output DC bus of other charging piles through the second output interface, so as to share and support other charging piles and increase the output power of other charging piles.

[0063] The charging system proposed in the present application includes a plurality of charging piles, and at least one second output interface of each charging pile is connected to a second output interface of another charging pile, so that the plurality of charging piles are connected together, and the number of charging piles for shared support can be determined later according to the power demand of the vehicle to be charged. The second output interface has a second communication wire, and the charging piles can communicate with other charging piles through the second communication wire, so as to facilitate the acquisition of the working status of other charging piles and send and receive support requests to other charging piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0065] The methods, systems and / or programs in the accompanying drawings will be further described according to exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein reference numerals represent similar mechanisms in the various views of the accompanying drawings.

[0066] Figure 1 This is a main circuit diagram of a charging pile involved in some embodiments of the present application;

[0067] Figure 2 A block diagram of the internal main circuit portion of a charging pile involved in some embodiments of the present application;

[0068] Figure 3 for Figure 1 A magnified view of part A;

[0069] Figure 4 for Figure 1 A magnified view of part B;

[0070] Figure 5 for Figure 1 Enlarged view of part C;

[0071] Figure 6 This is a working block diagram of two charging piles operating in conjunction with each other involved in some embodiments of the present application;

[0072] Figure 7 This is a working block diagram of three charging piles connected together for operation in some embodiments of the present application;

[0073] Figure 8 This is a working block diagram of the operation of seven charging piles in connection with each other involved in some embodiments of the present application. DETAILED DESCRIPTION

[0074] In order to better understand the above technical scheme, the technical scheme of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0075] In the following detailed description, numerous specific details are set forth by way of example in order to provide a comprehensive understanding of the relevant guidance. However, it will be apparent to those skilled in the art that the present application may be practiced without these details. In other cases, well-known methods, procedures, systems, compositions and / or circuits have been described at a relatively high level, without detail, in order to avoid unnecessarily obscuring aspects of the present application.

[0076] These and other features, the functions disclosed in the present application, the methods of execution, the functions of the related elements in the structure and the combination of parts and the production economy may become more apparent in consideration of the following description with reference to the accompanying drawings, all of which form a part of this application. However, it is to be understood that the drawings are for the purpose of illustration and description only and are not intended to limit the scope of this application. It should be understood that these drawings are not drawn to scale. However, it should be clearly understood that the drawings are for the purpose of illustration and description only and are not intended to limit the scope of this application. It should be known that these drawings are not in proportion.

[0077] Flowcharts are used in the present application to illustrate the execution process performed by the system according to the embodiment of the present application. It should be clearly understood that the execution process of the flowchart may not be performed in order. On the contrary, these execution processes may be performed in reverse order or simultaneously. In addition, at least one other execution process may be added to the flowchart. One or more execution processes may be deleted from the flowchart.

[0078] Example

[0079] Figure 1 It is the main circuit diagram of the charging pile in the embodiment of the present application, and the charging pile includes a main circuit part and a control part. Figure 2 It is a block diagram of the internal main circuit part of the charging pile in the embodiment of the present application. Figure 3 yes Figure 1 The enlarged view of part A in the figure. Figure 4 yes Figure 1 The enlarged view of part B in the figure. Figure 5 yes Figure 1 Magnified view of part C.

[0080] The main circuit part of the charging pile includes: power input end, electric energy metering sampling module, energy storage / filter inductor, active power factor correction module, two-level full-bridge LLC circuit module, bridge rectifier circuit module, filter inductor / capacitor, rectifier output switch, output DC bus, first output switch, first output interface, charging interface, second output switch, and second output interface.

[0081] The power input terminal is configured to be electrically connected to a power grid. Optionally, the power input terminal is a single-phase power input terminal.

[0082] The electric energy metering sampling module is electrically connected to the power input terminal and is used to collect relevant electrical parameters for subsequent metering of electric energy consumption.

[0083] The rear end of the electric energy metering sampling module is electrically connected to the energy storage / filter inductor, the active power factor correction module, the two-level full-bridge LLC circuit module, the bridge rectifier circuit module, and the filter inductor / capacitor in sequence, so that the alternating current from the power grid can be converted into direct current that meets the preset parameter requirements.

[0084] The rectifier output switch is electrically connected to the filter inductor / capacitor. The rear end of the rectifier output switch is electrically connected to the output DC bus, the first output switch, the first output interface, and the charging interface in sequence. The charging interface can be a charging gun or other structural form. By controlling the on and off of the first output switch, it is possible to control whether the charging interface provides power to the vehicle to be charged.

[0085] Optionally, the first output interface includes a ground protection line PE, a first positive and negative wire, a first communication wire, and an auxiliary control line.

[0086] The first positive and negative wires are electrically connected between the output DC bus and the charging interface to serve as a path for transmitting electric energy to the vehicle to be charged.

[0087] The first communication wire is configured to be electrically connected to the battery management system of the vehicle to be charged through the charging interface, so as to receive the charging demand information issued by the battery management system. The charging demand information includes the charging demand voltage, charging demand current, maximum charging voltage, maximum charging current, battery temperature, battery SOC (battery capacity percentage), monopolar battery maximum voltage, insulation performance and other information. Optionally, the first communication wire adopts CAN bus communication, and the relevant technical implementation methods of CAN bus communication are very mature, and this application will not be repeated here.

[0088] The auxiliary control lines include: positive and negative wires for the battery management system power supply, positive and negative wires for the gun head electromagnetic lock, positive and negative wires for the gun lock position signal, and wires for the gun head pin contact temperature probe.

[0089] The first output interface and the charging interface are connected via a first cable. It can be understood that the first cable has wires corresponding to the various types of wires in the first output interface.

[0090] The output DC bus is also electrically connected to the second output interface through the second output switch. The second output interface is configured to be electrically connected to the second output interface of other charging piles. The charging pile is connected to other charging piles through the second output interface to form a network. The electric energy on the output DC bus of other charging piles can be transmitted to the output DC bus of the charging pile through the second output interface, and then the charging power is combined and output to achieve the effect of fast charging.

[0091] Optionally, the second output interface includes a ground protection wire PE, a second positive and negative wire, and a second communication wire.

[0092] The second positive and negative wires are electrically connected to the output DC bus and are configured to be electrically connected to the second positive and negative wires of other charging piles to serve as a transmission path for shared support power.

[0093] The second communication wire is configured to be electrically connected to the second communication wires of other charging piles.

[0094] Optionally, the second output interface is connected to the second output interface of other charging piles via a second cable. It can be understood that the second cable has wires corresponding to various types of wires in the second output interface.

[0095] Optionally, the number of second output interfaces of the charging pile is two, and at least one second output interface of each of the multiple charging piles is connected to a second output interface of another charging pile, so that multiple charging piles can be connected to form a ring-shaped shared support network, and form a charging system with an external control platform. The charging interface of any charging pile can call the charging energy of this charging system: each charging pile plays a role of shared support, and can call the energy of other charging piles when they are idle.

[0096] Optionally, the charging pile is configured to send a support request to other charging piles through the second communication wire when it has a charging task; when it does not have a charging task, it responds to the support request of the target charging pile and transmits electric energy to the output DC bus of the target charging pile through its second output interface. The target charging pile is a charging pile whose charging interface is directly connected to the vehicle to be charged to provide electric energy. Furthermore, the charging pile will first read the working status of other charging piles through the second communication wire, and then send a support request to the charging pile in the idle state.

[0097] Optionally, when the charging pile receives a charging task while supporting other charging piles, that is, a vehicle to be charged is connected to the charging pile, the charging pile will disconnect the second output switch, thereby interrupting the transmission of power to other charging piles through its own second output interface, and at the same time close the first output switch to supply power to the vehicle to be charged.

[0098] Optionally, the charging pile is configured to disconnect the output DC bus from the power input terminal when a fault occurs in the circuit between the power input terminal and the output DC bus of the charging pile. For example, when the active power factor correction module, two-level full-bridge LLC circuit module and other circuits of the charging pile itself fail, the charging pile will disconnect the rectifier output switch, while the output DC bus at the rear end of the rectifier output switch can still be connected to other charging piles for networking: the output DC bus of the faulty charging pile can be connected to the output DC bus of other charging piles after the second output switch is closed, so that the charging pile at one end of the faulty charging pile can use the faulty charging pile to support the charging pile at the other end, avoiding the interruption of the networking of the piles at the faulty charging pile.

[0099] Optionally, the charging system is configured to control a target number of charging piles to support a target charging pile in response to the power demand of the vehicle to be charged, so that the output power of the target charging pile matches the power demand. For example, when the charging power of a single charging pile is 6.6KW, if the charging power demand of the vehicle to be charged is 19.8KW, it is determined that two charging piles are needed to support the target charging pile, so that the output power of the target charging pile reaches 19.8KW.

[0100] The charging piles in the shared support network are configured with corresponding control programs. Each charging pile is provided with an independent communication address and a preset communication protocol. Each charging pile can send / receive support requests and working status to other charging piles in the form of message codes through the second communication wire. Optionally, the second communication wire adopts CAN bus communication. The relevant technical implementation methods of CAN bus communication are very mature and will not be described in detail in this application.

[0101] The control part of the charging pile includes: communication module, electric energy metering processing module, front-stage PFC control module, two-level full-bridge LLC control module, rectifier output current acquisition module, rectifier output voltage acquisition module, rectifier output control module, first output control module, second output control module, first output voltage acquisition module, second output voltage acquisition module, first CAN control bus, second CAN control bus, and auxiliary control module.

[0102] The communication module is configured to communicate with the external control platform, so that the user can remotely query and retrieve the working information of the charging pile from the control platform. The communication module can use 3G, 4G, 5G and other communication technologies. Optionally, the control platform is installed with a dedicated control program and platform management software for the charging pile, which records the power consumption of the charging piles borrowing electricity from each other, which is convenient for query and mutual settlement.

[0103] The electric energy metering processing module is electrically connected to the electric energy metering sampling module, and is used to measure the electric energy consumed by the charging pile in daily operation according to the sampling results of the electric energy metering sampling module, including measuring the electric energy consumed in normal standby mode and measuring the electric energy consumed in each charging operation. The electric energy measurement of each charging operation is divided into the electric energy of single-machine charging operation and the electric energy of connected pile charging operation, and the two are measured separately. The electric energy metering processing module forms a classified metering record of the aforementioned consumed electric energy.

[0104] The front-stage PFC control module is connected to and controls the active power factor correction module, and the two-level full-bridge LLC control module is connected to and controls the two-level full-bridge LLC circuit module, so as to obtain direct current that meets the preset parameter requirements.

[0105] The rectifier output current acquisition module is connected to the output end of the bridge rectifier circuit module, and is used to collect the current at the output end. The rectifier output voltage acquisition module is connected to the output end of the bridge rectifier circuit module, and is used to collect the voltage at the output end. The rectifier output control module is connected to and controls the on-off of the rectifier output switch. The first output control module is connected to and controls the on-off of the first output switch. The second output control module is connected to and controls the on-off of the second output switch. The first output voltage acquisition module is electrically connected to the first positive and negative wires, and is used to collect the charging voltage of the first output interface. The second output voltage acquisition module is electrically connected to the second positive and negative wires, and is used to collect the charging voltage of the second output interface. The first CAN control bus is used to connect and control the first communication wire, and the second CAN control bus is used to connect and control the second communication wire. The auxiliary control module is used to connect and control the auxiliary control line.

[0106] The specific working mode of the charging pile in some embodiments is as follows.

[0107] When a single charging pile works independently, the charging pile and the power grid are powered on to complete normal startup, and the first output interface is connected to the electric vehicle through the first cable and the charging interface. The battery management system BMS on the vehicle side communicates and interacts with the charging pile through the first communication wire, completing the communication message exchange handshake between the charging pile and the electric vehicle. The charging pile side establishes and maintains communication with the electric vehicle side in a timely manner, and the charging pile side completes the charging process according to the charging needs of the electric vehicle side. Since the second communication wire of the charging pile is not connected to other charging piles, it cannot obtain shared support from other charging piles and can only operate independently. Therefore, the charging output power can only be the maximum effective output power of the single pile (about 6.6KW).

[0108] Figure 6The working block diagram of two charging piles in connection. When two charging piles are in connection, the second communication wires of the two charging piles are connected to each other, and the working status and other demand messages are transmitted to each other. When the target charging pile has a charging task and the other charging pile is idle, the target charging pile will read that the adjacent charging pile is idle and send a shared support request message, and the other charging pile will send a shared support response message. Then, the target charging pile will close its second output switch, and the other charging pile will start the shared support and close its second output switch, so that the output DC buses of the two charging piles are connected and the power output is combined, so that the charging output power is increased. In the case of only two charging piles forming a shared support connected pile network, the two adjacent charging piles are shared support resources for each other. With shared support, the charging output power can be doubled and the charging speed can be doubled.

[0109] Figure 7 This is a working block diagram of three charging piles working in a connected pile. When three charging piles are connected in a network, the two second communication wires of each charging pile are connected to one second communication wire of the other two charging piles to form a ring-shaped shared support network. The three charging piles transmit working status and other demand messages to each other.

[0110] When any one of the charging piles has a charging task (i.e., as the target charging pile) and the other two charging piles are idle, the target charging pile will read that the other two charging piles are idle and send a shared support request message, and the other two charging piles will send a shared support response message. Subsequently, the target charging pile will close its two second output switches, and the other two charging piles will start shared support and close their second output switches, so that the output DC buses of the three charging piles are connected and the power output is combined, so that the charging output power is increased. Any charging pile can apply for shared support to the adjacent left or right charging pile. When the adjacent charging pile receives the shared support request from the neighboring pile, it will start to provide shared support work when it has no charging task. The three charging piles are shared support resources for each other. With shared support, the charging output power can be doubled and the charging speed can be doubled.

[0111] If the other two charging piles have no charging tasks during the charging process of the target charging pile, the three charging piles will continue to combine their outputs until the charging task of the target charging pile is completed, and the second output switches of all charging piles are disconnected, and the charging task is completed.

[0112] If one of the other two charging piles (i.e., the second target charging pile) has a new charging task during the charging process of the target charging pile, the second target charging pile sends a shared interrupt message through the second communication wire. After the original target charging pile obtains that the second target charging pile has a new charging task, it responds to a message to temporarily interrupt its shared support, and the second output switch corresponding to the second target charging pile in the original target charging pile is disconnected; after the shared interrupt message sent by the second target charging pile is responded to, the second output switch corresponding to the original target charging pile in the second target charging pile is disconnected, thereby disconnecting the output DC bus of the two charging piles. The original target charging pile and the remaining charging pile continue to operate in conjunction, and the two charging piles merge the charging output. The shared support request sent by the second target charging pile through the second communication wire cannot get a response from the original target charging pile and the remaining charging pile. Therefore, the second target charging pile can only operate independently, and the charging output power cannot be supported.

[0113] To illustrate the operation of several charging piles, take seven charging piles as an example. Figure 8 The working block diagram of seven charging piles in a linked operation, where two second communication wires of each charging pile are connected to one second communication wire of the other two charging piles to form a ring-shaped shared support network. The seven charging piles transmit working status and other demand messages to each other.

[0114] When any one of the charging piles has a charging task (i.e., as the target charging pile) and the other six charging piles are idle, the target charging pile will read that the other six charging piles are idle and send a shared support request message, and the other six charging piles will send a shared support response message. Subsequently, the target charging pile will close its two second output switches, and the other six charging piles will start shared support and close their second output switches, so that the output DC buses of the seven charging piles are connected and the power output is combined, so that the charging output power is increased. Any charging pile can apply for shared support to the adjacent left or right charging pile. When the adjacent charging pile receives the shared support request from the neighboring pile, it will start to provide shared support work when it has no charging task. The seven charging piles are mutually shared support resources. With shared support, the charging output power can be increased sixfold, and the charging speed can be increased sixfold.

[0115] If the other six charging piles have no charging tasks during the charging process of the target charging pile, the seven charging piles will continue to merge their outputs until the charging task of the target charging pile is completed, and the second output switches of all the charging piles are disconnected, and the charging task is completed.

[0116] It is understandable that in order to obtain more charging piles for networking, improve the charging and output power of a single pile, and achieve a fast charging effect, more charging piles can be networked to form a larger single pile charging output power. Each charging pile is set with an independent address, and each charging pile is equipped with an independent input meter. In their respective shared support tasks, they can query each other's power consumption lists, and use the charging pile control software to clear the power consumption of each power consumption period (peak, valley, and flat), so as to achieve the power consumption settlement between mutual shared support.

[0117] To facilitate the description of the situation after the charging task of the charging pile in the shared support network changes, the seven charging piles connected in sequence are pile 1, pile 2, pile 3, pile 4, pile 5, pile 6, and pile 7, and pile 1 is also connected to pile 7 to form a ring-shaped shared support network, in which the target charging pile is pile 7. If pile 1 has a new charging task during the charging process of pile 7, pile 1 sends a shared interrupt message through its second communication wire. After pile 7 obtains the new charging task of pile 1 and responds to the message of temporarily interrupting its shared support, the second output switch of pile 7 is disconnected from the output DC bus of pile 1. After the shared interrupt message sent by pile 1 is responded, the second output switch of pile 1 is disconnected from the output DC bus of pile 7, so that the output DC buses of the two charging piles are disconnected. Pile 7 continues to operate in conjunction with piles 6, pile 5, pile 4, pile 3, and pile 2, and the charging output is temporarily combined by 6 charging piles. After a new charging task is started for pile 1, when a shared support request is issued through the second communication wire, since piles 2, 3, 4, 5, and 6 have charging tasks, pile 1 cannot get a response from other charging piles when issuing the shared support request, and pile 1 temporarily operates independently as a single pile.

[0118] If the control program of the charging system detects that there are two charging tasks in progress at the same time in the current pile network, a new shared support adjustment will be made. Specifically, the charging system is configured to respond to the power demand of the vehicle to be charged, and control the preset number of charging piles closest to the target charging pile to support the target charging pile, so that the output power of the target charging pile matches the power demand. For example, pile 1 and pile 7 have direct charging tasks. If the electric vehicle charging power demand corresponding to pile 1 is greater than 6.6KW, pile 2, which was originally networked with pile 7, will be split due to its proximity to pile 1, and the second output switch of pile 2 and the second output switch of pile 3 will be disconnected. Pile 2 and pile 7 temporarily interrupt the shared support, and pile 2 and pile 1 will be recombined to form a shared support combined charging output. If the electric vehicle charging power demand corresponding to pile 1 is still insufficient, the control program will make a new shared support adjustment again. Pile 3, which was originally networked with pile 7, will be split due to its proximity to pile 2, and the second output switch of pile 3 and the second output switch of pile 4 will be disconnected. Pile 3 and pile 7 temporarily interrupt the shared support, and pile 3, pile 2 and pile 1 will be recombined to form a shared support combined charging output. If the charging output of pile 7 is approaching the end of the period, the charging power required by the electric vehicle decreases, and the shared support of piles 4, 5, and 6 that originally formed a shared support with pile 7 is gradually interrupted from the distance from the pile 2 to the pile 3, and the idle charging piles are gradually connected with pile 1 to form a network according to the distance from the pile 2 and pile 3, from the distance from the pile 3 to the distance from the pile 1, so as to increase the charging output power of pile 1.

[0119] If one or more shared supporting charging piles in the connected pile network lose power, their second output switch cannot be controlled. At this time, although the connected pile network cannot form a closed loop, adjacent and consecutively adjacent shared supporting charging piles can still operate in connected piles. For example, if piles 3 and 6 lose power, piles 1, 2, and 7 can be re-formed into connected piles for operation, and piles 4 and 5 can be re-formed into connected piles for operation.

[0120] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0121] The serial numbers of the above-mentioned embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the utility model in essence or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, including a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the utility model.

[0123] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A charging system, characterized in that: include: Multiple charging stations; The charging pile comprises: Output DC bus; A first output interface, electrically connected to the output DC bus, configured to be electrically connected to a vehicle to be charged; A second output interface, electrically connected to the output DC bus, configured to be electrically connected to the second output interface of another charging pile; The number of the second output interfaces of the charging pile is two, and at least one second output interface of each charging pile is connected to one second output interface of another charging pile; The second output interface further includes: The second communication wire is configured to be electrically connected to the second communication wire of other charging piles.

2. The charging system according to claim 1, characterized in that: The charging pile also includes: a first output switch, electrically connected between the output DC bus and the first output interface; A first output control module, connected to control the first output switch; a second output switch, electrically connected between the output DC bus and the second output interface; The second output control module is connected to control the second output switch.

3. The charging system according to claim 1, characterized in that: The first output interface comprises: Ground protection line; A first positive and negative wire, electrically connected between the output DC bus and the charging interface, to serve as a path for transmitting electric energy to the vehicle to be charged; The first communication wire is configured to be electrically connected to the battery management system of the vehicle to be charged.

4. The charging system according to claim 1, characterized in that: The second output interface comprises: Ground protection line; The second positive and negative wires are electrically connected to the output DC bus and are configured to be electrically connected to the second positive and negative wires of other charging piles.

5. The charging system according to claim 1, characterized in that: The charging pile also includes: a power input terminal configured to be electrically connected to a power grid; An active power factor correction module, electrically connected to the power input terminal; A two-level full-bridge LLC circuit module, electrically connected to the active power factor correction module; The bridge rectifier circuit module is electrically connected between the two-level full-bridge LLC circuit module and the output DC bus.

6. The charging system according to claim 5, characterized in that: The charging pile also includes: An electric energy metering processing module, electrically connected to the electric energy metering sampling module; A front-stage PFC control module, configured to control the active power factor correction module; A two-level full-bridge LLC control module, configured to control the two-level full-bridge LLC circuit module; The rectifier output control module is configured to control the rectifier output switch.

7. The charging system according to claim 6, characterized in that: The charging pile also includes: An electric energy metering sampling module, electrically connected to the power input terminal; An energy storage / filter inductor, electrically connected between the electric energy metering sampling module and the active power factor correction module; A filter inductor / capacitor, electrically connected to the bridge rectifier circuit module; A rectifier output switch, electrically connected between the filter inductor / capacitor and the output DC bus; A rectifier output current acquisition module, configured to acquire the current at the output end of the bridge rectifier circuit module; A rectifier output voltage acquisition module, configured to acquire the voltage at the output end of the bridge rectifier circuit module; A first output voltage acquisition module, configured to acquire the charging voltage of the first output interface; The second output voltage acquisition module is configured to acquire the charging voltage of the second output interface.

8. The charging system according to claim 3, characterized in that: The charging pile also includes: a first cable, electrically connected between the first output interface and the charging interface; The charging system further comprises: The second cable is configured to electrically connect the second output interface of one of the charging piles with the second output interface of another of the charging piles.

9. The charging system according to claim 1, characterized in that: The charging pile is configured to send a support request to other charging piles through the second communication wire when it has a charging task; and to respond to the support request of the target charging pile and transmit electric energy to the output DC bus of the target charging pile through its own second output interface when it does not have a charging task.

10. The charging system according to claim 1, characterized in that: The charging system also includes a control platform; The charging pile also includes a communication module; The communication module is configured to be communicatively connected with the control platform.

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