Alternating charging type direct current charging pile system and control method thereof

Abstract

The invention belongs to the field of charging piles, and discloses an alternate charging type direct current charging pile system and a control method thereof.The system comprises a power unit, a centralized control unit, at least two sets of direct current contactors and at least two charging controllers; one end of the DC contactor is connected with the power unit, the other end of the DC contactor is connected with a vehicle battery, the state of the DC contactor is controlled by the charging controller, one group of communication ports of the charging controller are connected with a vehicle power battery management system, and the other group of communication ports are connected with the centralized control unit or the previous charging controller; the centralized control unit communicates with the charging controller, the power unit communicates with the charging controller, and the charging controller communicates with the vehicle power battery management system through a CAN bus, and when the multiple vehicle batteries need to be charged, the centralized control unit charges the multiple vehicle batteries in sequence according to a reservation sequence or charges the multiple vehicle batteries in turn within a fixed time; the technical problem that an existing charging pile is idle due to the fact that one charging gun can only charge one vehicle battery in a charging concentrated place is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging piles and relates to a wheel-charging direct current charging pile system and a control method thereof. Background Art

[0002] With the rapid development of the electric vehicle industry, the number of electric vehicles has continued to increase, and charging scenarios have become increasingly diverse. Recently, charging scenarios such as "residential charging" or "destination charging" in residential areas and parks have attracted much attention, mainly to meet the daily needs of ordinary private car owners.

[0003] After arriving at the destination, the owner only needs to park the electric car in the designated charging parking space, and then connect the vehicle's charging interface to the charging gun of the charging pile to start charging. At the same time, many charging piles and electric vehicles are equipped with intelligent charging management systems. Car owners can monitor the charging status, charging speed, remaining charging time and other information in real time through mobile phone APP or vehicle system. In addition, some charging piles also support the appointment charging function. Car owners can make an appointment for charging in advance according to their own schedule to ensure that they can start charging immediately after arriving at the destination.

[0004] Existing charging piles usually use one charging gun to charge one vehicle battery, which is suitable for some places with relatively low charging demand and a small number of vehicles, such as home garages and small parking lots. In some places with concentrated charging demand, such as large shopping mall parking lots and highway service areas, the method of charging one vehicle battery with one charging gun may cause the charging pile to be idle. For example, when a vehicle is charged but the charging gun is not disconnected, the charging pile will be idle if no new vehicle is connected, and it cannot charge other vehicles at the same time, which will cause a waste of resources during peak charging hours. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a wheel-charging DC charging pile system and a control method thereof. When multiple vehicle batteries need to be charged, the centralized control unit charges the multiple vehicle batteries in sequence according to the reservation order or charges the multiple vehicle batteries in turn within a fixed time, thereby solving the technical problem that the existing charging piles in the centralized charging location can only charge one vehicle battery with one charging gun, resulting in the charging piles being idle.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a wheel-charging DC charging pile system, comprising a power unit, a centralized control unit, at least two groups of DC contactors and at least two charging controllers; one end of the DC contactor is connected to the power unit, and the other end is used to connect to a vehicle battery, the state of the DC contactor is controlled by the charging controller, one group of communication ports of the charging controller is connected to a vehicle power battery management system, and the other group of communication ports is connected to the centralized control unit or the previous charging controller, the centralized control unit communicates with the charging controller via a CAN bus, the centralized control unit communicates with the power unit via a CAN bus, and the charging controller communicates with the vehicle power battery management system via a CAN bus.

[0007] Furthermore, the power unit includes at least one charging module, and the charging module is an AC / DC charging module; the charging module converts alternating current into direct current to charge the vehicle battery through a DC contactor.

[0008] Furthermore, the charging controller communicates with the vehicle power battery management system via the CAN bus, controls the charging process through signal interaction, and monitors the vehicle charging status.

[0009] Furthermore, it also includes a reservation management system for receiving charging reservation requests from vehicles and sorting the reservations in chronological order.

[0010] Furthermore, the reservation management system receives reservation requests through mobile phone applications, charging pile display screens or other communication channels, and provides users with reservation status query and notification services.

[0011] The present invention also provides a control method for a wheel-charging DC charging pile system. Based on the above-mentioned wheel-charging DC charging pile system, the method includes the following steps: real-time monitoring of the status of the vehicle currently being charged; determining the next vehicle to be charged in turn according to the appointment order or fixed time according to the status of the vehicle currently being charged, and the fixed time can be manually adjusted.

[0012] Furthermore, the charging of the next vehicle battery in the scheduled order includes: after the current vehicle battery is charged, the centralized control unit sends instructions to the next charging controller in the scheduled order, the charging controller controls the low-voltage auxiliary power-on, exchanges data with the vehicle power battery management system, and starts the charging process to charge the next vehicle in turn.

[0013] Furthermore, the next vehicle is charged at a fixed time, including: The centralized control unit monitors the vehicle status of each charging controller in real time. After a fixed time, it sends a pause command through the CAN bus. The charging controller disconnects the DC contactor according to the pause command and sends the pause status command to the centralized control unit. After receiving the pause status command of the previous vehicle, the centralized control unit sends a charging or resuming charging command to the next charging controller. After receiving the charging or resuming charging command, the next charging controller controls the low-voltage auxiliary power-on, exchanges data with the vehicle power battery management system, closes the DC contactor for charging, or sends corresponding commands to the vehicle power battery management system to close the DC contactor and resume charging.

[0014] Furthermore, it also includes that if the charging time of the current vehicle does not reach the fixed time and the charging is terminated, the charging of the next vehicle battery will continue.

[0015] Furthermore, when only one vehicle battery needs to be charged, the fixed time setting does not take effect and the current vehicle battery continues to be charged.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a wheel-charging DC charging pile system. When multiple vehicle batteries need to be charged, a centralized control unit charges the vehicle batteries in turn according to a scheduled order or within a fixed time, thereby avoiding the technical problem of idle charging piles and solving the problem of excessive power load caused by charging all vehicles at the same time. It can make full use of power resources and improve the overall charging efficiency.

[0017] The present invention provides a wheel-charging DC charging pile system, wherein the centralized control unit can realize remote monitoring and control of the charging process, and is convenient for management personnel to perform real-time monitoring and management of the charging facilities.

[0018] The present invention discloses a wheel-charging DC charging pile system, wherein a group of communication ports of a charging controller are connected to a centralized control unit, and another group of communication ports are connected to a vehicle power battery management system. The opening and closing states of a DC contactor are controlled by the charging controller, and the current charging state of a vehicle battery is determined by the charging controller.

[0019] The invention discloses a wheel-charging DC charging pile system, which can improve the utilization rate and charging efficiency of the charging pile, reduce resource waste, and is suitable for places with concentrated charging demands.

[0020] The present invention provides a wheel-charging DC charging pile system, in which a power unit is composed of multiple charging modules. Even if a charging module fails, other modules can still operate normally and continue to charge the vehicle battery without causing the entire charging system to be paralyzed, thereby improving the overall reliability of the system; the independent charging module can adjust parameters such as output power and voltage according to the specific specifications of the vehicle battery, thereby providing suitable charging services for various vehicles.

[0021] The present invention provides a wheel-charging DC charging pile system. When the charging time of the current vehicle battery does not reach a fixed time and the charging is finished, the next vehicle battery is charged immediately. Charging services can be provided for more vehicle batteries in the same time, thereby improving the overall charging efficiency.

[0022] The present invention provides a wheel-charging DC charging pile system. When only one vehicle battery needs to be charged, there is no need to consider the limit of fixed time, and the current vehicle battery is continuously charged. The power of the charging equipment can be fully utilized to fully charge the vehicle battery at the fastest speed, thereby improving the charging efficiency, avoiding charging interruption and restart caused by fixed time setting, and reducing the waste of charging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram of a wheel-charging DC charging pile system of the present invention is shown in FIG. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] Example 1 A wheel-charging DC charging pile system of the present invention comprises: a power unit, a centralized control unit, at least two groups of DC contactors and at least two charging controllers; one end of the DC contactor is connected to the power unit, and the other end is used to connect to a vehicle battery, the state of the DC contactor is controlled by the charging controller, one group of communication ports of the charging controller is connected to a vehicle power battery management system, and the other group of communication ports is connected to the centralized control unit or the previous charging controller, the centralized control unit communicates with the charging controller via a CAN bus, the centralized control unit communicates with the power unit via a CAN bus, and the charging controller communicates with the vehicle power battery management system via a CAN bus.

[0026] like Figure 1 As shown, the power unit includes multiple charging modules, wherein the charging modules are AC / DC charging modules, which convert alternating current into direct current for power supply and charging, and each group of charging modules is connected to multiple charging controllers and vehicle batteries.

[0027] Independent charging modules can adjust output current, voltage and other parameters according to the specific needs of vehicle batteries, providing appropriate charging services for various vehicles. For example, the battery voltage of a small electric car is relatively low, so the charging module can output a relatively low voltage for conventional charging; while for a large electric bus, whose battery voltage is high, the charging module can be adjusted to output a higher voltage for fast charging.

[0028] The power module communication port communicates with the centralized control unit through the CAN bus, and the power port is connected to the DC contactor, through which the energy in the charging module is transferred to the vehicle battery.

[0029] Specifically, the power unit feeds back its own working status information to the centralized control unit through the CAN bus, such as the current output power, voltage, current values, and whether there are fault alarms. At the same time, the centralized control unit can also send control instructions to the power module with the help of the CAN bus, such as adjusting the output voltage and output current, starting or stopping the operation of the charging module, and other operations. In other words, when the centralized control unit determines that the output power of a power module needs to be adjusted based on the charging needs of the vehicle battery and the load conditions of the entire charging pile system, the corresponding instructions can be accurately conveyed through the CAN bus, and the power module will respond in time after receiving the instructions to achieve precise charging power control.

[0030] When the power module receives the charging start instruction from the centralized control unit and adjusts the corresponding output parameters, the DC contactor closes. At this time, the DC power output by the power unit is transmitted to the vehicle battery through the connection line, through the DC contactor, and according to the established electrical path to start charging the battery. During the charging process, the power module continues to output DC power according to the vehicle charging requirements, and the DC contactor remains closed to ensure that electric energy is continuously and stably injected into the vehicle battery until charging is completed or there is a need to stop charging, such as the battery is full, an abnormality is detected, etc. The DC contactor then disconnects the circuit according to the corresponding signal to end the charging process.

[0031] The centralized control unit communicates with the superior supervision platform and controls the start of vehicle battery charging through the charging controller to ensure the orderly charging. The closing or disconnecting state of the DC contactor is controlled by the charging controller. Each charging controller has a unique address code. The centralized control unit communicates with the charging controller through the CAN bus, and identifies different charging controllers through address codes, and then identifies different charging guns to charge the vehicle battery.

[0032] The charging controller is connected to the vehicle's power battery management system, which can transmit detailed information about its own battery to the charging controller, such as remaining battery capacity, battery type, charging requirements, acceptable maximum charging power and other key parameters; the charging controller can feed back real-time status information during the charging process, such as current charging voltage, current, charging stage, etc. to the vehicle's power battery management system. The two parties can coordinately adjust the charging strategy based on this information to ensure safe and efficient charging.

[0033] Example 2 The present invention provides a control method for a wheel-charging DC charging pile system, comprising the following steps: real-time monitoring of the state of a vehicle currently being charged; and charging the vehicle battery in a scheduled sequence.

[0034] Real-time monitoring of the status of the vehicle currently being charged; after the current vehicle is charged, the batteries of the remaining vehicles are charged in the scheduled order. Specifically, the centralized control unit monitors the status of each charging gun in real time through the charging controller. After the current charging vehicle finishes charging, the centralized control unit will automatically send charging instructions to the corresponding charging controller in the scheduled order. The charging controller controls the low-voltage auxiliary power-on, starts data interaction with the vehicle, and starts the charging process, thereby realizing orderly queuing charging and charging the vehicles in turn.

[0035] The centralized control unit maintains real-time connection with each charging controller through the CAN bus, continuously receiving and processing status information from them; the centralized control unit can also record the historical charging data, vehicle information and system operation log of each charging gun, providing important basis for troubleshooting. By analyzing historical data, the peak charging demand in different time periods can be understood, so as to reasonably adjust the charging strategy.

[0036] Users can make a vehicle charging reservation through mobile applications, charging pile display screens or other communication channels. When making a reservation, users need to select the charging gun connected to the vehicle, the charging time, the charging power, and the charging amount. For example, users can select the charging gun connected to their vehicle on the mobile application and enter the charging power value to make a reservation.

[0037] After receiving the user's reservation information, the central control unit will queue it in the order of the reservation time. The central control unit will determine the position of the vehicle in the charging queue based on the associated information of the charging gun connected to the vehicle, and feedback the estimated waiting time to the user through the display screen or mobile phone application. For example, the central control unit can display the number of vehicles in the current charging queue and the estimated waiting time on the display screen of the charging pile, so that users can understand their charging progress.

[0038] After the current charging vehicle has finished charging, the centralized control unit will immediately detect the status change of the charging gun through the charging controller and determine the next vehicle to be charged according to the reservation order. In other words, the charging controller determines whether the current vehicle has finished charging by communicating with the vehicle battery management system and monitoring the control guidance signal. When it is determined that charging is finished, the status is sent to the centralized control unit, and the centralized control unit begins to look for the next vehicle to be charged.

[0039] The centralized control unit sends charging instructions to the corresponding charging controller. After receiving the instructions, the charging controller controls the low-voltage auxiliary power supply to provide the necessary power support for the vehicle. For example, the charging controller can realize the power-on and power-off operation of the low-voltage auxiliary power supply by controlling the on and off of the relay or contactor.

[0040] The charging controller determines the appropriate charging parameters, such as charging current and voltage, based on the vehicle's battery status information and starts charging the vehicle.

[0041] When the vehicle's battery is fully charged or the user terminates charging in advance, the charging controller will detect the change in charging status and feed this information back to the centralized control unit, which will store the time, power and other information of this charging in the database for user query and statistical analysis. At the same time, the centralized control unit will determine the next vehicle to be charged according to the reservation order, and repeat the above charging preparation and charging process to achieve orderly queuing charging and charge the vehicles in turn.

[0042] Example 3 The present invention provides a control method for a wheel-charging DC charging pile system, comprising the following steps: real-time monitoring of the status of a vehicle currently being charged; and charging the vehicle batteries in turn at a fixed time, wherein the fixed time can be manually adjusted.

[0043] The centralized control unit will control the charging process according to the preset fixed time. When the fixed time is reached, the centralized control unit will send a pause command to the charging controller that is charging through the CAN bus. After receiving the command, the charging controller sends a CCS message with SPN3929 as 0, the charging process is paused, and the output contactor is disconnected when the current drops below 5A, and the pause status command is sent to the centralized control unit for confirmation.

[0044] For example, the centralized control unit can be set to pause charging every 30 minutes to allow for rotational charging. When the fixed time arrives, the centralized control unit will send a pause command to the charging controller that is charging. The charging controller will send a message with SPN3929 as 0 in the CCS, adjust the output current, disconnect the DC contactor, pause the charging process, and send a confirmation signal to the centralized control unit.

[0045] After receiving the pause status instruction from the previous charging controller, the centralized control unit will send a charging or resuming charging instruction to the next charging controller according to the order of the charging queue. After receiving the instruction, the next charging controller will control the low-voltage auxiliary power-on according to the charging preparation steps, exchange data with the vehicle's BMS, start the charging process, or send a CCS message with SPN3929 as 1, and close the DC contactor to resume the charging process.

[0046] For example, when the centralized control unit receives the pause status instruction from the previous charging controller, it will query the next vehicle in the charging queue and send a charging instruction to the corresponding charging controller. After receiving the instruction, the charging controller will first control the low-voltage auxiliary power-on to prepare for the charging process. Then, the charging controller will exchange data with the vehicle's BMS to obtain the vehicle's battery demand information. If the vehicle's battery status is normal, the charging controller will close the DC contactor and start charging the vehicle battery.

[0047] During the charging process, the centralized control unit will monitor the status of each charging controller and vehicle battery in real time, and make adjustments and optimizations based on the situation.

[0048] When only one vehicle battery needs to be charged, the centralized control unit will recognize this situation and make the fixed time setting invalid. At this time, the centralized control unit will continue to send charging instructions to the charging controller, and the charging controller will continue to charge the current vehicle battery until the vehicle battery is full or the user manually stops charging.

[0049] Specifically, when the centralized control unit detects that only one vehicle is connected and needs to be charged, it will automatically set the fixed time to an invalid state and continue to send charging instructions to the charging controller. The charging controller will continue to charge the vehicle battery according to the instructions until the BMS detects that the battery is full or the user manually stops charging through the mobile phone application or the on-site operation panel.

[0050] It should be noted that no matter you charge the vehicle batteries in turn according to the appointment order or at a fixed time, you need to connect the charging pile gun head to the charging vehicle. Only when the gun head is accurately connected to the vehicle can the electric energy be continuously transmitted from the charging pile to the vehicle battery, realizing the basic function of charging.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

Claims

1. A wheel-charging DC charging pile system, characterized in that: It includes a power unit, a centralized control unit, at least two sets of DC contactors and at least two charging controllers; One end of the DC contactor is connected to the power unit, and the other end is used to connect to the vehicle battery. The state of the DC contactor is controlled by the charging controller. One group of communication ports of the charging controller is connected to the vehicle power battery management system, and the other group of communication ports is connected to the centralized control unit or the previous charging controller. The centralized control unit communicates with the charging controller through the CAN bus, the centralized control unit communicates with the power unit through the CAN bus, and the charging controller communicates with the vehicle power battery management system through the CAN bus.

2. The wheel-charging DC charging pile system according to claim 1 is characterized in that: The power unit includes at least one charging module, and the charging module is an AC / DC charging module; The charging module converts AC power into DC power to charge the vehicle battery through a DC contactor.

3. The wheel-charging DC charging pile system according to claim 1 is characterized in that: The charging controller communicates with the vehicle power battery management system via the CAN bus, controls the charging process through signal interaction, and monitors the vehicle charging status.

4. The wheel-charging DC charging pile system according to claim 1, characterized in that: It also includes a reservation management system for receiving charging reservation requests from vehicles and sorting the reservations in chronological order.

5. The wheel-charging DC charging pile system according to claim 4 is characterized in that: The reservation management system receives reservation requests through mobile phone applications, charging pile display screens or other communication channels, and provides users with reservation status query and notification services.

6. A control method for a wheel-charging DC charging pile system, characterized in that: The wheel-charging DC charging pile system according to any one of claims 1 to 5 comprises the following steps: Real-time monitoring of the status of the vehicle currently being charged; The next vehicle to be charged is determined according to the status of the vehicle currently being charged in a scheduled order or at a fixed time, and the fixed time can be adjusted manually.

7. The wheel-charging DC charging pile system control method according to claim 6, characterized in that: The next vehicle battery is charged according to the scheduled order, including: After the current vehicle battery is charged, the centralized control unit sends instructions to the next charging controller in the scheduled order. The charging controller controls the low-voltage auxiliary power-on, exchanges data with the vehicle power battery management system, and starts the charging process to charge the next vehicle in turn.

8. The wheel-charging DC charging pile system control method according to claim 6, characterized in that: The next vehicle is charged at a fixed time, including: The centralized control unit monitors the vehicle status of each charging controller in real time. After a fixed time, it sends a pause command through the CAN bus. The charging controller disconnects the DC contactor according to the pause command and sends the pause status command to the centralized control unit. After receiving the previous vehicle pause status instruction, the centralized control unit sends a charging or resuming charging instruction to the next charging controller. After receiving the charging or resuming charging instruction, the next charging controller controls the low-voltage auxiliary power-on, exchanges data with the vehicle power battery management system, closes the DC contactor for charging, or sends corresponding instructions to the vehicle power battery management system, closes the DC contactor, and resumes charging.

9. The wheel-charging DC charging pile system control method according to claim 8, characterized in that: It also includes the case where the charging time of the current vehicle does not reach the fixed time and the charging is terminated, then the charging of the battery of the next vehicle continues.

10. The wheel-charging DC charging pile system control method according to claim 8, characterized in that: It also includes that when only one vehicle battery needs to be charged, the fixed time setting does not take effect and the current vehicle battery continues to be charged.

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