Charging station and charging control method thereof

Abstract

The invention belongs to the field of electric vehicle charging, and particularly discloses a charging station and a charging control method thereof, and the charging station comprises N charging piles, M parallel switches and a power bus, each parallel switch comprises: four ports; a first port of one parallel switch is connected with an output end of one charging pile, a third port is connected with one charging gun corresponding to the charging pile, and a second port is connected with the power bus; when the first port of the parallel switch is connected with the second port and the second port is connected with the third port, the parallel switch works in a first mode; when the first port is connected with the fourth port, and the fourth port is connected with the third port, the device works in a second mode; when the first port is connected with the fourth port, and the second port is connected with the third port, the device works in a third mode; and when the first port is connected with the second port and the third port is connected with the fourth port, working in a fourth mode. According to the invention, the charging requirements of electric vehicles corresponding to different vehicle types and different capacities can be met.

Description

Technical Field

[0001] The present application belongs to the field of electric vehicle charging, and more specifically, to a charging station and a charging control method thereof. Background Art

[0002] Existing charging piles generally charge cars one-to-one or one-to-two, and can only provide charging services of the same specifications for electric vehicles of different models and capacities. Such services cannot fully utilize grid resources and are not conducive to improving user experience. They are mainly used in charging stations or parking lots where similar charging piles are centrally arranged. The electrical schematic diagram of the general charging station charging pile installation is as follows: Figure 1 shown.

[0003] For some plug-in and extended-range hybrid models, the battery capacity is relatively small, and a 30kW to 60kW charging pile can be fully charged in less than an hour. When the user controls the vehicle to start charging and does not wait in the vehicle, the vehicle cannot be driven away from the charging pile in time after it is quickly fully charged, which may cause the vehicle to occupy the charging pile for a long time, easily resulting in a waste of charging resources.

[0004] For some pure electric vehicles, a 60kW charging station takes 2 to 3 hours to fully charge. For operating vehicles, the charging power is insufficient and the waiting time is long.

[0005] For some larger vehicles such as buses and trucks, the battery capacity is greater than 180kWh, and the charging time is longer. If ultra-high-power charging piles are used directly when building charging stations, the cost is high and the grid capacity demand is large. At the same time, idle charging piles also waste a lot of grid resources.

[0006] In summary, some electric vehicles in existing charging stations charge quickly, but they occupy the charging piles for a long time, while some electric vehicles charge slowly and require a lot of waiting time for charging; and an electric vehicle can only be charged by one charging pile to which it is connected, resulting in the charging power of the idle charging piles not being fully utilized. Summary of the invention

[0007] In view of the defects of the prior art, the purpose of this application is to provide a charging station and a charging control method thereof, aiming to solve the problem that the charging power and charging control distribution of the existing charging stations are poor, resulting in waste of charging resources.

[0008] To achieve the above objectives, in a first aspect, the present application provides a charging station, comprising: N charging piles, M parallel switches and a power bus; N and M are both integers greater than 1;

[0009] Each parallel switch includes: a first port, a second port, a third port and a fourth port;

[0010] A first port of a parallel switch is connected to an output end of a charging pile, a third port is connected to a charging gun corresponding to the charging pile, and a second port is connected to the power bus;

[0011] When the first port of the parallel switch is connected to the second port, and the second port is connected to the third port, the parallel switch operates in the first mode;

[0012] When the first port of the parallel switch is connected to the fourth port, and the fourth port is connected to the third port, the parallel switch operates in the second mode;

[0013] When the first port of the parallel switch is connected to the fourth port, and the second port is connected to the third port, the parallel switch operates in the third mode;

[0014] When the first port of the parallel switch is connected to the second port, and the third port is connected to the fourth port, the parallel switch operates in a fourth mode;

[0015] When a charging gun connected to a parallel switch is connected to a device to be charged, if the parallel switch works in the first mode, the charging pile connected to it will supply power to the device to be charged alone; if the parallel switch works in the second mode, the charging pile connected to it and the charging piles connected to other parallel switches working in the third mode will jointly supply power to the device to be charged; if the parallel switch works in the third mode, the charging pile connected to it cannot supply power to the device to be charged, but supplies power to the device to be charged connected to the charging guns connected to other parallel switches working in the second mode; if the parallel switch works in the fourth mode, the charging pile connected to it cannot supply power to the device to be charged, but the charging piles connected to other parallel switches working in the third mode can supply power to the device to be charged.

[0016] In an optional example, when any one of the M parallel switches operates in the second mode to power the charged device connected to its corresponding charging gun, the parallel switches connected to other charging piles that cannot be used normally need to be switched to the first mode.

[0017] In an optional example, the charging power of each charging pile is the same and is less than a preset power value.

[0018] In an optional example, the charging station further includes: a control module;

[0019] The control module is used to control the M parallel switches to switch working modes.

[0020] In an optional example, the control module is also used to obtain information about at least one device to be charged connected to the charging guns corresponding to the M parallel switches, confirm the charging priority of at least one device to be charged based on the information, and control the M parallel switches to switch the working mode according to the charging priority and the charging power required by the device to be charged.

[0021] In a second aspect, the present application provides a charging control method for a charging station as described in the first aspect and any optional example of the first aspect, including:

[0022] Obtain at least one charging request; the charging request is sent by a device to be charged connected to the charging guns connected to the M parallel switches, and one device to be charged sends one charging request;

[0023] Determine the charging priority of the to-be-charged device according to the at least one charging request, and charge the device with a higher priority first;

[0024] When charging a device to be charged, if the charging pile connected to it can be used normally, when the charging power of the charging pile connected to it meets the charging demand, the parallel switch connected to the device to be charged is switched to the first mode; when the charging power of the charging pile connected to it does not meet the charging demand, the parallel switch connected to the device to be charged is switched to the second mode; then, according to the charging power required by the device to be charged, the parallel switch connected to the idle charging pile connected with the parallel switch and the parallel switch connected to the non-idle charging pile working in the first mode are switched to the third mode until the parallel power of all the charging piles supplying power to the device to be charged meets the charging demand; wherein, the idle charging pile is switched to the third mode in priority to the non-idle charging pile; the charging demand is: the parallel power of all the charging piles supplying power to the device to be charged is greater than or equal to the required charging power;

[0025] During the charging process of the device to be charged, when the charging power required by the device to be charged gradually decreases, the parallel switches connected to the non-idle charging piles are preferentially switched back to the first mode one by one, and then the parallel switches connected to the idle charging piles are switched to other modes; finally, when the charging power of the charging piles connected to the device to be charged meets the charging demand, the parallel switches connected to the device to be charged are switched to the first mode.

[0026] In an optional example, when any one of the M parallel switches operates in the second mode, the parallel switch connected to the charging pile that cannot be used normally is switched to the first mode; then when none of the M parallel switches operates in the second mode, the parallel switch connected to the charging pile that cannot be used normally is switched to the fourth mode.

[0027] In an optional example, the method further includes:

[0028] When charging a device to be charged, if the charging pile to which it is connected cannot be used normally, the parallel switch connected to it is switched to or maintained in the fourth mode;

[0029] Afterwards, according to the charging power required by the device to be charged, the parallel switch connected to the idle charging pile with the parallel switch and the parallel switch working in the first mode connected to the non-idle charging pile are switched to the third mode until the parallel power of all charging piles powering the device to be charged meets the charging demand; wherein, the idle charging pile is switched to the third mode preferentially compared to the non-idle charging pile.

[0030] In an optional example, the charging request includes: required charging power;

[0031] Determining the charging priority of the device to be charged according to the at least one charging request includes at least one of the following methods:

[0032] When a charging request is received from a device to be charged at the same time or time period, the device to be charged is directly charged;

[0033] When multiple charging requests are received from multiple devices to be charged at the same time or time period, the time required for multiple devices to be charged to start charging and enter the constant voltage charging stage is comprehensively considered, and priorities are assigned to the multiple devices to be charged with the goal of having a relatively short average fast charging time for the multiple devices to be charged; among them, the charging priority of a charging device requiring a larger charging power is higher than that of a charging device requiring a smaller charging power, so that the constant power charging of multiple charging piles in parallel is performed preferentially on the charging device requiring a larger charging power, so that the time spent in the constant current charging stage and the constant power charging stage is relatively short.

[0034] In an optional example, a device to be charged with a lower priority can interrupt the charging process of a device to be charged with a higher priority that is connected to a first-mode parallel switch, switch the corresponding parallel switch to the third mode, and then switch the corresponding parallel switch back to the first mode, so that the charging pile where the corresponding parallel switch is located continues to charge the device to be charged with a higher priority.

[0035] In an optional example, when charging a device to be charged, if the charging pile to which it is connected can be used normally, but the charging power of the charging pile to which it is connected does not meet the charging requirements, or if the charging pile to which it is connected cannot be used normally, then when switching the parallel switch connected to the corresponding charging pile to the third mode, the charging power of the charging pile connected to the parallel switch that is already working in the third mode should be considered.

[0036] In an optional example, when the charging power of the charging pile to which the device to be charged is connected meets the charging requirement, the parallel switch connected to the device to be charged is switched to the first mode, specifically:

[0037] When the charging power of the charging pile connected to the device to be charged meets the charging demand, if there are still parallel switches working in the third mode at this time, if there are parallel switches working in the fourth mode at this time, or planned to switch to the fourth mode or the second mode, then at least one parallel switch is retained to work in the third mode without switching, and the other parallel switches are switched from the third mode to other modes; wherein the number and position of the parallel switches retained in the third mode are determined by the required charging power of the device to be charged connected to the parallel switches working in the fourth mode or planned to switch to the fourth mode or the second mode, and the charging power of the charging pile connected to each third mode parallel switch.

[0038] In an optional example, the aiming at a relatively short average fast charging time of the plurality of devices to be charged includes:

[0039] According to the charging power required by each device to be charged and the charging power of each charging pile connected to the M parallel switches, at least one charging pile that meets the required charging power is allocated to each device to be charged for charging, so that each device to be charged can complete the constant current charging stage and the constant power charging stage as quickly as possible, and enter the constant voltage charging stage in a relatively short time; wherein, a single charging pile can meet the charging needs of various devices to be charged in the constant voltage charging stage.

[0040] In general, the above technical solutions conceived by the present application have at least the following beneficial effects compared with the prior art:

[0041] The present application provides a charging station and a charging control method thereof. The present application designs a parallel switch with four working modes, which can realize the switching of parallel or separate power supply between charging piles; and adjusts the concentrated power through the working mode of the parallel switch so that each device to be charged can quickly enter the constant voltage charging mode, and then the connected charging pile performs constant voltage charging alone until charging is completed. The charging station provided by the present application has relatively small changes to the original charging station. Through the parallel charging piles, fast charging and super charging of the devices to be charged can be realized, and the capacity of the power grid can be fully utilized to meet the charging needs of devices to be charged of different models and capacities. According to the charging time required by the user and the peak and valley band of the current power grid, the charging power or the number of parallel charging piles is adjusted to effectively control the charging time and save charging resources. In addition, through the design of the working mode of the parallel switch, the present application can also realize the normal charging of the connected devices to be charged by adjusting the parallel switch for the charging piles that cannot be used, so as to avoid the charging power of the idle charging piles in the charging station being wasted. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the electrical connection of the charging piles of the existing charging station;

[0043] Figure 2 is a schematic diagram of a parallel switch connected to a charging pile provided in an embodiment of the present application;

[0044] Figure 3 It is a schematic diagram of the parallel switches connected to the charging piles provided in the embodiment of the present application working in different modes;

[0045] Figure 4 is a flow chart of a control method for a charging station provided in an embodiment of the present application;

[0046] Figure 5A This is a schematic diagram of the electrical connection of a charging pile in a working stage provided by an embodiment of the present application;

[0047] Figure 5B is a schematic diagram of electrical connection of a charging pile in another working stage provided by an embodiment of the present application;

[0048] Figure 5C This is a schematic diagram of the electrical connection of a charging pile in another working stage provided by an embodiment of the present application;

[0049] Figure 5D This is a schematic diagram of the electrical connection of a charging pile in another working stage provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0052] An embodiment of the present application provides a charging station, including: N charging piles, M parallel switches and a power bus; N and M are both integers greater than 1.

[0053] Among them, in the charging station provided in the embodiment of the present application, a charging pile may include one or more charging guns, which can be used to transmit electrical energy to the electric vehicle. One end of the charging gun can be connected to the charging socket of the charging pile, and the other end can be connected to the charging interface of the electric vehicle.

[0054] Furthermore, the parallel switch provided in the embodiment of the present application can be connected between a charging pile and a charging gun connected to it.

[0055] Alternatively, if Figure 2As shown, each parallel switch includes: a first port, a second port, a third port and a fourth port; wherein the first port of a parallel switch is connected to the output end of a charging pile, the third port is connected to a charging gun corresponding to the charging pile, and the second port is connected to the power bus.

[0056] For example, the power busbar may be used to connect multiple charging piles in parallel, so as to connect the power of the multiple charging piles in parallel to charge an electric vehicle.

[0057] It can be understood that when the first port of the parallel switch is connected to the second port, and the second port is connected to the third port, the parallel switch operates in the first mode;

[0058] When the first port of the parallel switch is connected to the fourth port, and the fourth port is connected to the third port, the parallel switch operates in the second mode;

[0059] When the first port of the parallel switch is connected to the fourth port, and the second port is connected to the third port, the parallel switch operates in the third mode;

[0060] When the first port of the parallel switch is connected to the second port, and the third port is connected to the fourth port, the parallel switch operates in a fourth mode;

[0061] When a charging gun connected to a parallel switch is connected to a device to be charged, if the parallel switch works in the first mode, the charging pile connected to it will supply power to the device to be charged alone; if the parallel switch works in the second mode, the charging pile connected to it and the charging piles connected to other parallel switches working in the third mode will jointly supply power to the device to be charged; if the parallel switch works in the third mode, the charging pile connected to it cannot supply power to the device to be charged, but supplies power to the device to be charged connected to the charging guns connected to other parallel switches working in the second mode; if the parallel switch works in the fourth mode, the charging pile connected to it cannot supply power to the device to be charged, but the charging piles connected to other parallel switches working in the third mode can supply power to the device to be charged.

[0062] As an example, when any one of the M parallel switches operates in the second mode to power the device to be charged connected to its corresponding charging gun, the parallel switches connected to other charging piles that cannot be used normally need to be switched to the first mode.

[0063] It should be noted that when a device to be charged is in the second mode, if the charging pile that cannot be used normally at this time is in the fourth mode, the charging pile connected to the third mode parallel switch will charge the device to be charged connected to the second mode parallel switch, and will also charge the device to be charged connected to the fourth mode parallel switch, which will reduce the power of the device to be charged in the second mode. Therefore, in this application, the second mode and the fourth mode are set to exist in the charging station at different times, that is, only one device to be charged is in the high-power charging state in the second mode at the same time in the entire charging station. At this time, the charging pile that cannot be used normally should be switched to the first mode to avoid reducing the charging power of the high-power charging device in the second mode.

[0064] It is understandable that the parallel switch has four ports, one port is directly connected to the output of the charging pile, one port is used as the flow midpoint, one port is directly connected to the charging gun, and one port is used to interconnect with other parallel switches to form a power bus. The parallel switch has four different switching modes, and the switch can be switched according to the current usage requirements to achieve equipment power expansion, idle power utilization, basic charging functions and equipment maintenance functions.

[0065] Optionally, the above-mentioned parallel switch has four different working modes. The first mode to the fourth mode can be respectively called: independent mode, expansion mode, supply mode and maintenance mode according to their functions. Independent mode means that the charging pile where the switch is located completes the charging work independently. Expansion mode means that the charging pile where the switch is located is connected in parallel with the other idle charging piles to achieve high-power charging. Supply mode means that the charging pile where the switch is located is connected in parallel with the other charging piles in expansion mode to achieve power supply. Maintenance mode means that when the charging pile where the switch is located cannot work normally, the parking space and charging gun where the charging pile is located can still complete the charging work with the help of the other charging piles in supply mode. Furthermore, as mentioned above, expansion mode and maintenance mode do not exist at the same time.

[0066] As an example, the charging station further includes: a control module;

[0067] The control module is used to control the M parallel switches to switch working modes.

[0068] As an example, the control module is also used to obtain information about at least one device to be charged connected to the charging guns corresponding to the M parallel switches, confirm the charging priority of at least one device to be charged based on the information, and control the M parallel switches to switch the working mode according to the charging priority and the charging power required by the device to be charged.

[0069] In one example, the parallel switch is composed of controllable switches, such as electric circuit breakers, contactors, relays, thyristors and other similar devices. The control module is a circuit or module that gathers information from the controller area network (CAN) bus or network cable between each charging pile and sends parallel switch control instructions. The control module mainly uses the CAN bus for information collection and parallel control instruction issuance. The control module can collect the current working status, working time requirements and working time expectations of all charging piles in the station, and has the function of sending parallel switch control instructions.

[0070] As an example, the charging power of each charging pile is the same and is less than a preset power value.

[0071] It is understandable that the charging power of each charging pile in the charging station provided by the present application can be different or the same. Those skilled in the art can design the charging power of each charging pile in the charging station according to needs. For example, the solution provided by the present application can be applicable to small and medium power charging piles.

[0072] In one embodiment, the device to be charged may be an electric vehicle. In this embodiment of the application, an electric vehicle is taken as an example to introduce the provided charging station.

[0073] Figure 3 It is a schematic diagram of the parallel switches connected to the charging piles provided in the embodiment of the present application working in different modes;

[0074] The charging pile 1 where the S1 switch is located works in the first mode, and the charging pile connected to it directly charges the electric vehicle;

[0075] The charging pile 2 where the S2 switch is located works in the second mode, using the idle charging pile power and its own power in parallel to charge the electric vehicle 2;

[0076] The charging pile 3 where the S3 switch is located works in the third mode. At this time, no electric vehicle is connected. The idle power is transmitted to the charging pile where the S2 switch is located through the parallel switch to charge the electric vehicles 2 and 3.

[0077] The charging pile 4 where the S4 switch is located is under maintenance and is working in the fourth mode, and does not have normal working conditions. The electric car 3 uses the idle power of the charging pile where the S3 switch is located to charge.

[0078] Figure 4 is a flow chart of a control method for a charging station provided in an embodiment of the present application; Figure 4 As shown, the following steps are included:

[0079] Step S101, obtaining at least one charging request; the charging request is sent by a device to be charged connected to the charging guns connected to the M parallel switches, and one device to be charged sends one charging request;

[0080] Step S102, determining the charging priority of the device to be charged according to the at least one charging request, and charging the device with a higher priority first;

[0081] Step S103, when charging a certain device to be charged, if the charging pile connected to it can be used normally, when the charging power of the charging pile connected to it meets the charging demand, the parallel switch connected to the device to be charged is switched to the first mode, and when the charging power of the charging pile connected to it does not meet the charging demand, the parallel switch connected to the device to be charged is switched to the second mode, and then according to the charging power required by the device to be charged, the parallel switch connected to the idle charging pile connected with the parallel switch and the parallel switch connected to the non-idle charging pile working in the first mode are switched to the third mode until the parallel power of all charging piles supplying power to the device to be charged meets the charging demand; wherein, the idle charging pile is switched to the third mode in priority to the non-idle charging pile; the charging demand is: the parallel power of all charging piles supplying power to the device to be charged is greater than or equal to the required charging power;

[0082] Step S104, during the charging process of the device to be charged, when the charging power required by the device to be charged is gradually reduced, the parallel switches connected to the non-idle charging piles are preferentially switched back to the first mode one by one, and then the parallel switches connected to the idle charging piles are switched to other modes; finally, when the charging power of the charging pile connected to the device to be charged meets the charging demand, the parallel switches connected to the device to be charged are switched to the first mode.

[0083] In an optional example, when any one of the M parallel switches operates in the second mode, the parallel switch connected to the charging pile that cannot be used normally is switched to the first mode; then when none of the M parallel switches operates in the second mode, the parallel switch connected to the charging pile that cannot be used normally is switched to the fourth mode.

[0084] Specifically, a charging pile that cannot be used normally refers to a charging pile that is under repair, maintenance or is broken.

[0085] In an optional example, the method further includes:

[0086] When charging a device to be charged, if the charging pile to which it is connected cannot be used normally, the parallel switch connected to it is switched to or maintained in the fourth mode;

[0087] Afterwards, according to the charging power required by the device to be charged, the parallel switch connected to the idle charging pile with the parallel switch and the parallel switch working in the first mode connected to the non-idle charging pile are switched to the third mode until the parallel power of all charging piles powering the device to be charged meets the charging demand; wherein, the idle charging pile is switched to the third mode preferentially compared to the non-idle charging pile.

[0088] In an optional example, the charging request includes: required charging power;

[0089] Determining the charging priority of the device to be charged according to the at least one charging request includes at least one of the following methods:

[0090] When a charging request is received from a device to be charged at the same time or time period, the device to be charged is directly charged;

[0091] When multiple charging requests are received from multiple devices to be charged at the same time or time period, the time required for multiple devices to be charged to start charging and enter the constant voltage charging stage is comprehensively considered, and priorities are assigned to the multiple devices to be charged with the goal of having a relatively short average fast charging time for the multiple devices to be charged; among them, the charging priority of a charging device requiring a larger charging power is higher than that of a charging device requiring a smaller charging power, so that the constant power charging of multiple charging piles in parallel is performed preferentially on the charging device requiring a larger charging power, so that the time spent in the constant current charging stage and the constant power charging stage is relatively short.

[0092] Further optionally, the design of the above charging priority may not be based solely on the power requirements of each device to be charged; in some special scenarios, such as some devices that require relatively low charging power and / or devices that urgently need to be charged within a period of time, they can send relevant requests or pay additional expedited fees to set the charging priority of the device higher, and the charging process of the device cannot be interrupted by the charging of other devices. Those skilled in the art can set the charging priority for the device to be charged according to the actual scenario.

[0093] Optionally, the parameters affecting the charging priority may also include: the number of idle charging piles in the charging station, the number of vehicles to be charged, and one or more of the historical matching information. When there are a large number of idle charging piles, all connected charging devices can be charged while all charging piles are charged. When there are a small number of idle charging piles, high-power charging devices can be controlled to charge first.

[0094] For example, an average charging time can be set, and the average charging time of all devices to be charged under various charging priority strategies can be calculated through a pre-designed algorithm to select the optimal charging priority strategy for charging control. The optimal charging priority strategy refers to the strategy with the shortest average charging time, or a priority strategy that satisfies the above average charging time can be selected.

[0095] It is understandable that the above charging time may be the time from the start of charging to the constant voltage charging stage, or the time from the start of charging to the completion of charging.

[0096] In an optional example, a device to be charged with a lower priority can interrupt the charging process of a device to be charged with a higher priority that is connected to a first-mode parallel switch, switch the corresponding parallel switch to the third mode, and then switch the corresponding parallel switch back to the first mode, so that the charging pile where the corresponding parallel switch is located continues to charge the device to be charged with a higher priority.

[0097] In an optional example, when charging a device to be charged, if the charging pile to which it is connected can be used normally, but the charging power of the charging pile to which it is connected does not meet the charging requirements, or if the charging pile to which it is connected cannot be used normally, then when switching the parallel switch connected to the corresponding charging pile to the third mode, the charging power of the charging pile connected to the parallel switch that is already working in the third mode should be considered.

[0098] In an optional example, when the charging power of the charging pile to which the device to be charged is connected meets the charging requirement, the parallel switch connected to the device to be charged is switched to the first mode, specifically:

[0099] When the charging power of the charging pile connected to the device to be charged meets the charging demand, if there are still parallel switches working in the third mode at this time, if there are parallel switches working in the fourth mode at this time, or planned to switch to the fourth mode or the second mode, then at least one parallel switch is retained to work in the third mode without switching, and the other parallel switches are switched from the third mode to other modes; wherein the number and position of the parallel switches retained in the third mode are determined by the required charging power of the device to be charged connected to the parallel switches working in the fourth mode or planned to switch to the fourth mode or the second mode, and the charging power of the charging pile connected to each third mode parallel switch.

[0100] In an optional example, the aiming at a relatively short average fast charging time of the plurality of devices to be charged includes:

[0101] According to the charging power required by each device to be charged and the charging power of each charging pile connected to the M parallel switches, at least one charging pile that meets the required charging power is allocated to each device to be charged for charging, so that each device to be charged can complete the constant current charging stage and the constant power charging stage as quickly as possible, and enter the constant voltage charging stage in a relatively short time; wherein, a single charging pile can meet the charging needs of various devices to be charged in the constant voltage charging stage.

[0102] In a specific embodiment, according to the charging characteristics of the battery in the device to be charged, constant current, constant power, and finally constant voltage are used to reach the constant voltage stage. As the constant voltage charging time becomes longer and longer, the charging current will gradually decrease, and the charging power will also gradually decrease. Therefore, the overall charging strategy of the charging station is to give priority to the electric vehicle to complete the constant power stage charging, and then charge the constant voltage stage separately. Assuming that the charging power of a single pile is 30kW, the charging power required by electric vehicle 1 is 30kW, the charging power required by electric vehicle 2 is 90kW, and the charging power required by electric vehicle 3 is 60kW. Charging pile 4 is under maintenance and cannot work independently.

[0103] According to the above charging strategy, combined with the attached Figure 5A To Attachment Figure 5D As shown, the working stages of the charging station are as follows:

[0104] 1. Switch S1 and switch S3 are adjusted to working mode 3-supply mode, and switch S2 is adjusted to working mode 2-capacity expansion mode. At this time, the charging power of electric vehicle 2 is 90kW. Since the charging station is in working mode 2 at this time, switch S4 is adjusted to working mode 1-independent mode. Since charging pile 4 is under maintenance, electric vehicles 3 and 1 do not start charging. For specific electrical connections, see Figure 5A shown.

[0105] 2. After a period of charging, electric vehicle 2 enters the constant voltage charging stage. When the charging power drops to 60kW, switch S1 is adjusted to working mode 1-independent mode, and electric vehicle 1 starts charging. For specific electrical connections, see Figure 5B shown.

[0106] 3. After charging for a period of time, the constant voltage charging power of electric vehicle 2 drops to 30kW. At this time, switch S2 is adjusted to working mode 1-independent mode, switch S1 is adjusted to working mode 3-supply mode, and switch 4 is adjusted to working mode 4-maintenance mode. At this time, electric vehicle 1 stops charging and electric vehicle 3 starts charging at 60kW. For specific electrical connections, see Figure 5C shown.

[0107] 4. When electric vehicle 3 enters the constant voltage charging stage and the constant voltage charging power is lower than 30kW, switch S1 is adjusted to working mode 1-independent mode. At this time, electric vehicles 1, 2, and 3 are all connected to the 30kW charging pile and work in constant voltage mode. For specific electrical connections, see Figure 5D shown.

[0108] In summary, the main implementation idea of ​​the charging control method for the charging station provided by the present application is to prioritize power concentration by adjusting the working mode of the parallel switch, so that all electric vehicles can complete the constant current and constant power charging stage as soon as possible and enter the constant voltage charging stage; when entering the constant voltage charging stage, the capacity of the battery of the general electric vehicle is about 70% to 80%, which can basically meet the charging needs of the user. Then, the electric vehicle is charged at a constant voltage through the independent working mode of each charging pile until the charging is completed. Therefore, the present application provides a charging station using parallel switches, which makes little change to the original charging equipment. Through parallel charging piles, fast charging and super charging of electric vehicles can be achieved, and the capacity of the power grid can be fully utilized to meet the charging needs of electric vehicles of different models and capacities. According to the charging time required by the user and the peak and valley band of the current power grid, the charging power or the number of parallel charging piles is adjusted to effectively control the charging time and save power grid resources.

[0109] It should be understood that expressions such as "including" and "may include" that may be used in the present application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present application, terms such as "including" and / or "having" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components, or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0110] In addition, in the present application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0111] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the relative position relationship after connection remains unchanged. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after connection. "Sliding connection" means that the two are connected to each other and can slide relative to each other after connection. The directional terms mentioned in the embodiments of the present application, such as "top", "bottom", "inside", "outside", "left", "right", etc., are only reference directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0112] In addition, in the embodiments of the present application, the mathematical concepts mentioned are symmetry, equality, parallelism, verticality, etc. These limitations are all for the current state of the art, rather than being absolutely strict definitions in a mathematical sense, and allow a small amount of deviation, approximation to symmetry, approximation to equality, approximation to parallelism, approximation to verticality, etc. are all possible. For example, A and B are parallel, which means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. A and B are perpendicular, which means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0113] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A charging station, characterized in that: include: N charging piles, M parallel switches and power bus; N and M are both integers greater than 1; Each parallel switch includes: a first port, a second port, a third port and a fourth port; A first port of a parallel switch is connected to an output end of a charging pile, a third port is connected to a charging gun corresponding to the charging pile, and a second port is connected to the power bus; When the first port of the parallel switch is connected to the second port, and the second port is connected to the third port, the parallel switch operates in the first mode; When the first port of the parallel switch is connected to the fourth port, and the fourth port is connected to the third port, the parallel switch operates in the second mode; When the first port of the parallel switch is connected to the fourth port, and the second port is connected to the third port, the parallel switch operates in the third mode; When the first port of the parallel switch is connected to the second port, and the third port is connected to the fourth port, the parallel switch operates in a fourth mode; When a charging gun connected to a parallel switch is connected to a device to be charged, if the parallel switch works in the first mode, the charging pile connected to it will supply power to the device to be charged alone; if the parallel switch works in the second mode, the charging pile connected to it and the charging piles connected to other parallel switches working in the third mode will jointly supply power to the device to be charged; if the parallel switch works in the third mode, the charging pile connected to it cannot supply power to the device to be charged, but supplies power to the device to be charged connected to the charging guns connected to other parallel switches working in the second mode; if the parallel switch works in the fourth mode, the charging pile connected to it cannot supply power to the device to be charged, but the charging piles connected to other parallel switches working in the third mode can supply power to the device to be charged.

2. The charging station according to claim 1, characterized in that When any one of the M parallel switches works in the second mode to supply power to the device to be charged connected to its corresponding charging gun, the parallel switches connected to other charging piles that cannot be used normally need to be switched to the first mode.

3. The charging station according to claim 1, characterized in that: Also includes: Control module; The control module is used to control the M parallel switches to switch working modes.

4. The charging station according to claim 3, characterized in that: The control module is also used to obtain information about at least one device to be charged connected to the charging guns corresponding to the M parallel switches, confirm the charging priority of at least one device to be charged based on the information, and control the M parallel switches to switch working modes based on the charging priority and the charging power required by the device to be charged.

5. A charging control method for a charging station according to any one of claims 1 to 4, characterized in that: include: Obtain at least one charging request; the charging request is sent by a device to be charged connected to the charging guns connected to the M parallel switches, and one device to be charged sends one charging request; Determine the charging priority of the to-be-charged device according to the at least one charging request, and charge the device with a higher priority first; When charging a device to be charged, if the charging pile connected to it can be used normally, when the charging power of the charging pile connected to it meets the charging demand, the parallel switch connected to the device to be charged is switched to the first mode; when the charging power of the charging pile connected to it does not meet the charging demand, the parallel switch connected to the device to be charged is switched to the second mode; then, according to the charging power required by the device to be charged, the parallel switch connected to the idle charging pile connected with the parallel switch and the parallel switch connected to the non-idle charging pile working in the first mode are switched to the third mode until the parallel power of all the charging piles supplying power to the device to be charged meets the charging demand; wherein, the idle charging pile is switched to the third mode in priority to the non-idle charging pile; the charging demand is: the parallel power of all the charging piles supplying power to the device to be charged is greater than or equal to the required charging power; During the charging process of the device to be charged, when the charging power required by the device to be charged gradually decreases, the parallel switches connected to the non-idle charging piles are preferentially switched back to the first mode one by one, and then the parallel switches connected to the idle charging piles are switched to other modes; finally, when the charging power of the charging piles connected to the device to be charged meets the charging demand, the parallel switches connected to the device to be charged are switched to the first mode.

6. The method according to claim 5, characterized in that When any one of the M parallel switches works in the second mode, the parallel switch connected to the charging pile that cannot be used normally is switched to the first mode; then when none of the M parallel switches works in the second mode, the parallel switch connected to the charging pile that cannot be used normally is switched to the fourth mode.

7. The method according to claim 5, characterized in that Also includes: When charging a device to be charged, if the charging pile to which it is connected cannot be used normally, the parallel switch to which it is connected is switched to or maintained in the fourth mode; Afterwards, according to the charging power required by the device to be charged, the parallel switch connected to the idle charging pile with the parallel switch and the parallel switch working in the first mode connected to the non-idle charging pile are switched to the third mode until the parallel power of all charging piles powering the device to be charged meets the charging demand; wherein, the idle charging pile is switched to the third mode preferentially compared to the non-idle charging pile.

8. The method according to any one of claims 5 to 7, characterized in that: The charging request includes: required charging power; Determining the charging priority of the device to be charged according to the at least one charging request includes at least one of the following methods: When a charging request is received from a device to be charged at the same time or time period, the device to be charged is directly charged; When multiple charging requests are received from multiple devices to be charged at the same time or time period, the time required for multiple devices to be charged to start charging and enter the constant voltage charging stage is comprehensively considered, and priorities are assigned to the multiple devices to be charged with the goal of having a relatively short average fast charging time for the multiple devices to be charged; among them, the charging priority of a charging device requiring a larger charging power is higher than that of a charging device requiring a smaller charging power, so that the constant power charging of multiple charging piles in parallel is performed preferentially on the charging device requiring a larger charging power, so that the time spent in the constant current charging stage and the constant power charging stage is relatively short.

9. The method according to any one of claims 5 to 7, characterized in that: The device to be charged with a lower priority can interrupt the charging process of the device to be charged with a higher priority connected to the parallel switch in the first mode, switch the corresponding parallel switch to the third mode, and then switch the corresponding parallel switch back to the first mode, so that the charging pile where the corresponding parallel switch is located continues to charge the device to be charged with a higher priority.

10. The method according to claim 8, characterized in that The goal of taking the average fast charging time of multiple devices to be charged as relatively short includes: According to the charging power required by each device to be charged and the charging power of each charging pile connected to the M parallel switches, at least one charging pile that meets the required charging power is allocated to each device to be charged for charging, so that each device to be charged can complete the constant current charging stage and the constant power charging stage as quickly as possible, and enter the constant voltage charging stage in a relatively short time; wherein, a single charging pile can meet the charging needs of various devices to be charged in the constant voltage charging stage.

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