A wheel charging pile system and control method thereof

Abstract

The present application belongs to the technical field of charging piles, and discloses a wheel-charging charging pile system and a control method thereof. During the power consumption valley period, the AC / DC module can be used to charge the energy storage system while supplying power to each charging pile for wheel charging. During the non-power consumption valley period, the energy storage system can be used to supply power to each charging pile for wheel charging, or the AC / DC module can be used to supply power to each charging pile for wheel charging. The on-off control of the first contactor, each third contactor and the fourth contactor can also be used to realize the energy storage system and the AC / DC module alternately supplying power to each charging pile, and even to realize the use of the AC / DC module to supply power to some charging piles while the energy storage system is used to supply power to other charging piles. The flexibility of selecting the power supply mode of the wheel-charging charging pile system can be improved, and the user can select different power supply modes according to actual needs, which is conducive to improving user experience.

Description

Technical Field

[0001] The present application relates to the technical field of charging piles, and in particular to a wheel charging pile system and a control method thereof. Background Art

[0002] The on-board charger (OBC) is a device on new energy vehicles that converts the AC power of the AC charging pile into the DC power required by the power battery. Since the on-board charger is more prone to failure, more and more new energy vehicle manufacturers are adopting a de-OBC strategy (i.e. canceling the on-board charger on new energy vehicles). As a result, small DC charging pile systems are increasingly being used.

[0003] At present, there is a type of small DC charging pile system that uses small DC rotation charging technology, which can provide different charging modes to meet different battery usage requirements. In addition, it can also provide a lower charging temperature, thereby more effectively protecting the battery and reducing the loss during charging. Small DC charging pile systems set up in residential areas and industrial parks, due to the tiered charging mode of electricity charges, will set up energy storage systems to charge during the electricity consumption valley period and discharge during the electricity consumption peak period to power each charging pile. However, in the existing small DC charging pile system, when switching the power supply mode (the mode of using the city power to supply power to the charging pile and the mode of using the energy storage system to supply power to the charging pile), the power supply mode of all charging piles in the system is switched uniformly. Users cannot freely choose the power supply mode and can only queue up for rotation charging with all the charging piles in use. The flexibility is low and it is not conducive to improving the user experience. Summary of the invention

[0004] The purpose of the present application is to provide a wheel charging pile system and a control method thereof, which can improve the flexibility of selecting the power supply mode of the wheel charging pile system and help improve the user experience.

[0005] In a first aspect, the present application provides a wheel charging pile system, including a main control module, an AC / DC module, an energy storage system, a DC / DC module, a first bus, a second bus, at least one first charging pile, at least one second charging pile and a contactor combination, wherein the AC / DC module, the energy storage system, the DC / DC module, each of the first charging piles, each of the second charging piles and the contactor combination are all electrically connected to the main control module, the AC / DC module is electrically connected to the first bus and the energy storage system through a first line and a second line respectively, the energy storage system is electrically connected to the DC / DC module through a third line, the DC / DC module is also electrically connected to the second bus, all of the first charging piles are electrically connected to the first bus, and all of the second charging piles are electrically connected to the second bus;

[0006] The AC / DC module can convert the mains power into direct current to supply power to the first bus and the energy storage system; the energy storage system can store the direct current input from the second line and output direct current to the third line; the DC / DC module can regulate the direct current from the third line and input it into the second bus; the contactor combination includes a first contactor arranged on the first line, a second contactor arranged on the second line, a third contactor arranged between each charging pile and the corresponding bus, and a fourth contactor connected between the first bus and the second bus; the main control module is used to control the operation of the contactor combination to switch the power supply mode of each first charging pile and each second charging pile.

[0007] The charging pile system can charge the energy storage system through the AC / DC module during the power consumption valley period, and supply power to each charging pile for rotation charging through the AC / DC module at the same time. During the non-power consumption valley period, the energy storage system can supply power to each charging pile for rotation charging, or the AC / DC module can supply power to each charging pile for rotation charging. The on-off control of the first contactor, each third contactor and the fourth contactor can also be used to realize the energy storage system and the AC / DC module alternately supplying power to each charging pile, and even to realize the use of the AC / DC module to supply power to some charging piles while the energy storage system is used to supply power to other charging piles. The flexibility of selecting the power supply mode of the wheel-charging charging pile system can be improved, and the user can choose different power supply modes according to actual needs, which is conducive to improving user experience.

[0008] Preferably, the energy storage system includes an energy storage battery and a battery management system.

[0009] Preferably, the charging pile can input the reverse output current from the car battery into the corresponding bus, the DC / DC module can also regulate the voltage of the reverse output current and then input it in reverse into the energy storage system, and the energy storage system can also store the direct current reversely input by the DC / DC module.

[0010] Therefore, when necessary, the battery of the user's vehicle can be used to reverse charge the energy storage system to alleviate the shortage of power in the energy storage system.

[0011] Preferably, the energy storage system can also output direct current in reverse to the AC / DC module, and the AC / DC module can also convert the direct current output by the energy storage system in reverse into alternating current for supply to the commercial power grid.

[0012] Therefore, when necessary, the energy storage system can be used to reverse power supply to the mains grid to alleviate the power supply shortage of the mains grid.

[0013] In a second aspect, the present application provides a wheel charging pile system control method, which is applied to the main control module of the wheel charging pile system described above, comprising the steps of:

[0014] A1. During the off-peak period, the energy storage system is charged through the AC / DC module, and all user vehicles are charged in a first power supply mode; the first power supply mode is to charge by powering the AC / DC module;

[0015] A2. During the off-peak period, if all user vehicles choose the low-price charging mode, all user vehicles are charged in turn in the second power supply mode; the second power supply mode is to charge by powering the energy storage system;

[0016] A3. During the off-peak period, if all user vehicles choose the high-price charging mode, all user vehicles will be charged in turn in the first power supply mode;

[0017] A4. During the non-peak period, if some user vehicles choose the low-price charging mode and some user vehicles choose the high-price charging mode, the user vehicles that choose the high-price charging mode will be charged in rotation with the first power supply mode, and the user vehicles that choose the low-price charging mode will be charged in rotation with the second power supply mode.

[0018] Preferably, step A1 comprises:

[0019] During the power consumption valley period, controlling the second contactor to be attracted, so as to charge the energy storage system through the AC / DC module;

[0020] During the electricity consumption valley period, the first contactor and the fourth contactor are controlled to be attracted, and the third contactor corresponding to the charging pile used by each user vehicle is controlled to be attracted in turn, so as to charge all user vehicles in turn in the first power supply mode.

[0021] Preferably, step A2 comprises:

[0022] During the off-peak period, if all user vehicles choose the low-price charging mode, the first contactor and the second contactor are controlled to be disconnected, the fourth contactor is controlled to be attracted, and the third contactor corresponding to the charging pile used by each user vehicle is controlled to be attracted in turn, so as to charge all user vehicles in turn in the second power supply mode.

[0023] Preferably, step A3 comprises:

[0024] During the off-peak period, if all user vehicles choose the high-price charging mode, the first contactor and the fourth contactor are controlled to be energized, the second contactor is controlled to be disconnected, and the third contactor corresponding to the charging pile used by each user vehicle is controlled to be energized in turn, so as to charge all user vehicles in turn in the first power supply mode.

[0025] Preferably, step A4 comprises:

[0026] A401. Sort the first user's vehicle by the order of the requested charging time to obtain a first sorting result; and sort the second user's vehicle by the order of the requested charging time to obtain a second sorting result; the first user's vehicle is a user's vehicle that selects a high-price charging mode, and the second user's vehicle is a user's vehicle that selects a low-price charging mode;

[0027] A402. According to the first sorting result, each first user vehicle is charged in turn using the first power supply mode;

[0028] A403. If the charging pile used by the first user vehicle currently being charged is the first charging pile, the fourth contactor is disconnected, and before the first user vehicle currently being charged completes charging, the second user vehicle using the second charging pile is charged in the second power supply mode in the order of the second sorting result;

[0029] A404. If the charging pile used by the first user vehicle currently being charged is the second charging pile, the fourth contactor is controlled to be attracted, and the AC / DC module is used to supply power to the first user vehicle currently being charged;

[0030] A405. After all the first user vehicles have completed charging, if there are still second user vehicles that have not completed charging, the second user vehicles that have not completed charging are charged in sequence according to the second sorting result using the second power supply mode.

[0031] Preferably, the method further comprises the steps of:

[0032] A5. During the off-peak period, if a user vehicle chooses the electricity selling mode, the battery of the corresponding user vehicle is used to reverse charge the energy storage system during the idle period.

[0033] Beneficial effect: The wheel-charging charging pile system and control method provided by the present application can charge the energy storage system through the AC / DC module and supply power to each charging pile for wheel charging at the same time during the electricity consumption valley period. During the non-electricity consumption valley period, the energy storage system can supply power to each charging pile for wheel charging, or the AC / DC module can supply power to each charging pile for wheel charging. The on-off control of the first contactor, each third contactor and the fourth contactor can also be used to realize the energy storage system and the AC / DC module alternately supplying power to each charging pile, and even to realize the use of the AC / DC module to supply power to some charging piles while the energy storage system is used to supply power to other charging piles. The flexibility of selecting the power supply mode of the wheel-charging charging pile system can be improved, and users can choose different power supply modes according to actual needs, which is conducive to improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A circuit diagram of a wheel charging pile system provided in an embodiment of the present application.

[0035] Figure 2 This is a device module connection diagram of the wheel charging pile system provided in an embodiment of the present application.

[0036] Figure 3 Flow chart of a wheel charging pile system control method provided in an embodiment of the present application.

[0037] Explanation of reference numerals: 1. Main control module; 2. AC / DC module; 3. Energy storage system; 301. Energy storage battery; 302. Battery management system; 4. DC / DC module; 5. First busbar; 6. Second busbar; 7. First charging pile; 8. Second charging pile; 9. Contactor combination; 901. First contactor; 902. Second contactor; 903. Third contactor; 904. Fourth contactor; 10. First line; 11. Second line; 12. Third line; 90. City power grid. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0039] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0040] Please refer to Figure 1 , Figure 2 In some embodiments of the present application, a wheel charging pile system includes a main control module 1, an AC / DC module 2, an energy storage system 3, a DC / DC module 4, a first bus 5, a second bus 6, at least one first charging pile 7, at least one second charging pile 8 and a contactor combination 9, wherein the AC / DC module 2, the energy storage system 3, the DC / DC module 4, each first charging pile 7, each second charging pile 8 and the contactor combination 9 are all electrically connected to the main control module 1, the AC / DC module 2 is electrically connected to the first bus 5 and the energy storage system 3 through a first line 10 and a second line 11 respectively (specifically, it is electrically connected to the first bus 5 through the first line 10, and is electrically connected to the energy storage system 3 through the second line 11), the energy storage system 3 is electrically connected to the DC / DC module 4 through a third line 12, the DC / DC module 4 is also electrically connected to the second bus 6, all first charging piles 7 are electrically connected to the first bus 5, and all second charging piles 8 are electrically connected to the second bus 6;

[0041] The AC / DC module 2 can convert the AC power into DC power to supply power to the first bus 5 and the energy storage system 3. The energy storage system 3 can store the DC power input from the second line 11 and can output DC power to the third line 12. The DC / DC module 4 can adjust the voltage of the DC power from the third line 12 and input it into the second bus 6; the contactor combination 9 includes a first contactor 901 arranged on the first line 10, a second contactor 902 arranged on the second line 11, a third contactor 903 arranged between each charging pile and the corresponding bus, and a fourth contactor 904 connected between the first bus 5 and the second bus 6; the main control module 1 is used to control the operation of the contactor combination 9 to switch the power supply mode of each first charging pile 7 and each second charging pile 8 (the specific meaning of the different power supply modes is described later).

[0042] In the off-peak period, when the electricity price is low, the charging pile system can charge the energy storage system 3 through the AC / DC module 2, and at the same time, the AC / DC module 2 can supply power to each charging pile for rotation charging. In the non-off-peak period, when the electricity price is high, the energy storage system 3 can be used to supply power to each charging pile for rotation charging (thereby avoiding high-priced electricity and reducing the charging price for users), or the AC / DC module 2 can be used to supply power to each charging pile for rotation charging. The on-off control of the first contactor 901, each third contactor 903 and the fourth contactor 904 (the specific control method is described later) can be used to realize the energy storage system 3 and the AC / DC module 2 to alternately supply power to each charging pile, and even to realize the use of the AC / DC module 2 to supply power to some charging piles while the energy storage system 3 is used to supply power to other charging piles (thereby reducing the charging queue time and improving the overall charging efficiency). The flexibility of selecting the power supply mode of the wheel-charging charging pile system can be improved, and the user can select different power supply modes according to actual needs, which is conducive to improving the user experience.

[0043] In fact, the first line 10, the second line 11, the third line 12, the first busbar 5, and the second busbar 6 all include positive lines and negative lines. Only one contactor needs to be provided on the positive line and the negative line to realize the on-off control of the corresponding line. However, more preferably, at least one contactor can be provided on both the positive line and the negative line to improve the reliability of the on-off control of the corresponding line. Similarly, each charging pile is connected to the corresponding busbar through a positive connecting line and a negative connecting line. Only one contactor needs to be provided on the positive connecting line and the negative connecting line to realize the on-off control between the corresponding charging pile and the busbar. However, more preferably, at least one contactor can be provided on both the positive connecting line and the negative connecting line.

[0044] Thus, in some preferred embodiments, at least one first contactor 901 is provided on each of the positive and negative lines of the first circuit 10; for example Figure 1 In the embodiment, a first contactor 901 is respectively provided on the positive line and the negative line of the first circuit 10, but the present invention is not limited thereto.

[0045] In some preferred embodiments, at least one second contactor 902 is disposed on each of the positive and negative lines of the second circuit 11; for example Figure 1 In the embodiment, a second contactor 902 is respectively provided on the positive line and the negative line of the second circuit 11, but the present invention is not limited thereto.

[0046] In some preferred embodiments, at least one third contactor 903 is provided on each of the positive connection line and the negative connection line between each charging pile and the corresponding busbar; for example Figure 1 In the embodiment, a third contactor 903 is respectively provided on the positive electrode connection line and the negative electrode connection line between each charging pile and the corresponding busbar, but the present invention is not limited thereto.

[0047] In some preferred embodiments, two fourth contactors 904 are provided, wherein one fourth contactor 904 connects the positive line of the first busbar 5 and the positive line of the second busbar 6, and the other fourth contactor 904 connects the negative line of the first busbar 5 and the negative line of the second busbar 6. Figure 1 shown.

[0048] Specifically, see Figure 2 The energy storage system 3 includes an energy storage battery 301 and a battery management system 302. The energy storage battery 301 is electrically connected to the battery management system 302, and the battery management system 302 is also electrically connected to the main control module 1, the second line 11 and the third line 12. The energy storage battery 301 is used to store electric energy, and the battery management system 302 is used to control the charging and discharging of the energy storage battery 301 (including switching of the charging current direction and switching of the output current direction).

[0049] In some preferred embodiments, the charging piles (the first charging pile 7 and the second charging pile 8) can input the reverse output current from the car battery into the corresponding busbar, and the DC / DC module 4 can also adjust the voltage of the reverse output current and then input it into the energy storage system 3 in reverse, and the energy storage system 3 can also store the direct current reversely input by the DC / DC module 4. Therefore, when necessary and with the user's permission, the energy storage system 3 can be reversely charged by the battery of the user's vehicle (the user's vehicle refers to the vehicle connected to the charging pile) to alleviate the situation of insufficient power of the energy storage system 3.

[0050] Specifically, when the energy storage system 3 is charged through the AC / DC module 2, the battery management system 302 switches the direction of the charging current of the energy storage system 3 from the second line 11 to the energy storage battery 301. When the energy storage system 3 is charged by the reverse output current from the car battery, the battery management system 302 switches the direction of the charging current of the energy storage system 3 from the third line 12 to the energy storage battery 301.

[0051] In some preferred embodiments, the energy storage system 3 can also output direct current in reverse to the AC / DC module 2, and the AC / DC module 2 can also convert the direct current in reverse output by the energy storage system 3 into alternating current and supply it to the mains grid 90. Therefore, when necessary, the energy storage system 3 can be used to reversely supply power to the mains grid 90 to alleviate the power supply shortage of the mains grid 90.

[0052] Specifically, when power is supplied to the charging pile through the energy storage system 3, the battery management system 302 switches the output current direction of the energy storage system 3 to output to the third line 12. When power is reversely supplied to the municipal power grid 90 through the energy storage system 3, the battery management system 302 switches the output current direction of the energy storage system 3 to output to the second line 11.

[0053] Among them, the models and performance parameters of AC / DC module 2 and DC / DC module 4 can be selected according to actual needs. For example, the maximum power of AC / DC module 2 can be selected from 20kW, 30kW, 40kW, 60kW, etc., and AC / DC module 2 can adopt the SIC solution of air duct isolation, seal the components and boards that are sensitive to the environment, and then perform glue filling treatment, so as to avoid dust, moisture, and salt spray from causing corrosion or insulation damage to the device, with low failure rate and long service life. For example, the maximum power of DC / DC module 4 can be selected from 20kW, 30kW, 40kW, 60kW, etc., and DC / DC module 4 can adopt the SIC solution of air duct isolation, seal the components and boards that are sensitive to the environment, and then perform glue filling treatment, so as to avoid dust, moisture, and salt spray from causing corrosion or insulation damage to the device, with low failure rate and long service life.

[0054] Each charging pile (the first charging pile 7 and the second charging pile 8 ) includes a CCU (communication controller) module, and the CCU module is used for communication connection with the user vehicle and the main control module 1 .

[0055] The main control module 1 is also connected to the management platform for communication to send the settlement information of the user's vehicle (for example, including part or all of the charging power, charging electricity price, charging amount, electricity sales power, electricity sales price, electricity sales amount, etc.) to the management platform so that the management platform can perform settlement processing.

[0056] refer to Figure 3 The present application provides a wheel charging pile system control method, which is applied to the main control module 1 of the wheel charging pile system mentioned above, and includes the following steps:

[0057] A1. During the electricity consumption valley period, the energy storage system 3 is charged through the AC / DC module 2, and all user vehicles are charged in turn in the first power supply mode; the first power supply mode is to charge through the AC / DC module 2;

[0058] A2. During the off-peak period, if all user vehicles choose the low-price charging mode, all user vehicles are charged in turn in the second power supply mode; the second power supply mode is to charge through the energy storage system 3;

[0059] A3. During the off-peak period, if all user vehicles choose the high-price charging mode, all user vehicles will be charged in turn in the first power supply mode;

[0060] A4. During the non-peak period, if some user vehicles choose the low-price charging mode and some user vehicles choose the high-price charging mode, the user vehicles that choose the high-price charging mode will be charged in rotation with the first power supply mode, and the user vehicles that choose the low-price charging mode will be charged in rotation with the second power supply mode.

[0061] It should be noted that the low price of the low-price charging mode and the high price of the high-price charging mode are relative concepts, which means that the electricity price in the high-price charging mode (the electricity price refers to the price per unit of electricity) is higher than the electricity price in the low-price charging mode.

[0062] Since the city electricity price is lower during the valley period than during the non-valley period, the energy storage system 3 is charged through the AC / DC module 2 during the valley period, and the user's vehicle is charged through the energy storage system 3 during the non-valley period. On the one hand, it can reduce the power supply load of the city power grid 90 during the non-valley period, and on the other hand, it is beneficial to reduce the charging cost of the user when charging during the non-valley period.

[0063] Specifically, step A1 includes:

[0064] During the off-peak period, the second contactor 902 is controlled to be closed, so as to charge the energy storage system 3 through the AC / DC module 2;

[0065] During the power consumption valley period, the first contactor 901 and the fourth contactor 904 are controlled to be attracted, and the third contactor 903 corresponding to the charging pile used by each user vehicle is controlled to be attracted in turn, so that all user vehicles are charged in turn in the first power supply mode.

[0066] When the second contactor 902 is energized, the second line 11 is connected, and the energy storage battery 301 is charged with the direct current from the second line 11; when the fourth contactor 904 is energized, the first bus 5 and the second bus 6 are connected. After the first contactor 901 is energized, the first line 10 is connected, so that the AC / DC module 2 supplies power to the first bus 5 and the second bus 6 through the first line 10. Then, all user vehicles are charged with the direct current provided by the AC / DC module 2. When performing the round-robin charging, the corresponding third contactors 903 are controlled to be energized in sequence according to the order of the charging times requested by each user vehicle.

[0067] Further, step A2 comprises:

[0068] During the off-peak period, if all user vehicles choose the low-price charging mode, the first contactor 901 and the second contactor 902 are controlled to be disconnected, the fourth contactor 904 is controlled to be attracted, and the third contactor 903 corresponding to the charging pile used by each user vehicle is controlled to be attracted in turn, so as to charge all user vehicles in turn in the second power supply mode.

[0069] Among them, during the non-power consumption valley period, the user can directly select the charging mode through the operation interface on the charging pile (that is, the first charging pile 7 and the second charging pile 8 are both provided with a human-machine interaction module), or select the charging mode through a mobile terminal (such as a mobile phone) (the mobile terminal can communicate with the charging pile, the main control module 1 or the management platform, so that the selection result can reach the main control module 1). The charging modes for users to choose include low-price charging mode and high-price charging mode.

[0070] When the first contactor 901 and the second contactor 902 are disconnected, the first line 10 and the second line 11 are disconnected, and the use of the mains power for charging is stopped. After the fourth contactor 904 is closed, the first bus 5 and the second bus 6 are connected, and the energy storage battery 301 outputs direct current to the third line 12, which is then output to the bus after voltage regulation by the DC / DC module 4. Then, all user vehicles are charged in turn with the direct current provided by the energy storage system 3. When performing the round-robin charging, the corresponding third contactors 903 are controlled to be closed in sequence according to the order of the charging times requested by each user vehicle.

[0071] Wherein, step A3 comprises:

[0072] During the off-peak period, if all user vehicles choose the high-price charging mode, the first contactor 901 and the fourth contactor 904 are controlled to be energized, the second contactor 902 is controlled to be disconnected, and the third contactor 903 corresponding to the charging pile used by each user vehicle is controlled to be energized in turn, so as to charge all user vehicles in turn in the first power supply mode.

[0073] When the second contactor 902 is disconnected, the second line 11 is disconnected, and the energy storage system 3 is stopped from being charged with AC power. After the fourth contactor 904 is energized, the first bus 5 and the second bus 6 are connected. When the first contactor 901 is energized, the first line 10 is connected, so that the AC / DC module 2 supplies power to the first bus 5 and the second bus 6 through the first line 10. Then, all user vehicles are charged with the direct current provided by the AC / DC module 2. When performing the round-robin charging, the corresponding third contactors 903 are controlled to be energized in sequence according to the order of the charging times requested by each user vehicle.

[0074] The advantages of the high-price charging mode over the low-price charging mode are: first, charging priority is higher. When some user vehicles choose the high-price charging mode and some user vehicles choose the low-price charging mode, the user vehicles that choose the high-price charging mode will be charged first; second, the charging speed using the AC / DC module 2 is faster than the charging speed using the energy storage system 3 (this is because in order to protect the energy storage battery 301, its discharge speed will be limited to a certain extent, while there is no such limitation when using the AC / DC module 2 for power supply); therefore, the high-price charging mode is usually more time-saving, and for users who are more sensitive to charging time, they can pay more in exchange for a shorter charging time.

[0075] Specifically, step A4 includes:

[0076] A401. Sort the first user's vehicle by the order of the requested charging time to obtain a first sorting result; and sort the second user's vehicle by the order of the requested charging time to obtain a second sorting result; the first user's vehicle is a user's vehicle that selects a high-price charging mode, and the second user's vehicle is a user's vehicle that selects a low-price charging mode;

[0077] A402. According to the first sorting result, each first user vehicle is charged in turn using the first power supply mode;

[0078] A403. If the charging pile used by the first user vehicle currently being charged is the first charging pile 7, the fourth contactor 904 is disconnected, and before the first user vehicle currently being charged completes charging, the second user vehicle using the second charging pile 8 is charged in the second power supply mode in the order of the second sorting result;

[0079] A404. If the charging pile used by the first user vehicle currently being charged is the second charging pile 8, the fourth contactor 904 is controlled to be attracted, and the AC / DC module 2 is used to supply power to the first user vehicle currently being charged;

[0080] A405. After all first user vehicles have completed charging, if there are still second user vehicles that have not completed charging, the second user vehicles that have not completed charging are charged in sequence according to the second sorting result using the second power supply mode.

[0081] Among them, in step A402, the second contactor 902 is controlled to be disconnected (so as to stop using the city power to charge the energy storage system 3), and the fourth contactor 904 is controlled to be attracted (so as to connect the first bus 5 and the second bus 6), and according to the first sorting result, the third contactor 903 of the charging pile corresponding to each first user vehicle is controlled to be attracted in turn to realize the wheel charging of each first user vehicle.

[0082] Among them, in step A403, if the charging pile used by the first user vehicle currently being charged is the first charging pile 7, the fourth contactor 904 is disconnected. At this time, the energy storage system 3 supplies power to the second bus 6 and does not affect the operation of the first charging pile 7. Therefore, before the first user vehicle currently being charged completes charging, the energy storage system 3 is controlled to output DC power to the third line 12 to perform rotation charging on the second user vehicle using the second charging pile 8, which can reduce the waiting time of the second user vehicle and improve the overall charging efficiency; when the second user vehicles using the second charging pile 8 are charged in sequence according to the order of priority in the second sorting result in the second power supply mode, the third contactors 903 corresponding to the second charging piles 8 are controlled to be attracted in sequence for rotation charging according to the order of priority in the second sorting result of each second user vehicle using the second charging pile 8.

[0083] Among them, in step A404, if the charging pile used by the first user vehicle currently being charged is the second charging pile 8, at this time, it is impossible to avoid the interference of the output current of the energy storage system 3 on the first user vehicle. Therefore, the energy storage system 3 is controlled to stop outputting current, and the fourth contactor 904 is controlled to be attracted, and the third contactor 903 of the second charging pile 8 used by the first user vehicle currently being charged is kept attracted, and the other third contactors 903 are disconnected, so as to use the AC / DC module 2 to supply power to the first user vehicle currently being charged.

[0084] Among them, in step A405, after all the first user vehicles have completed charging, if there are still second user vehicles that have not completed charging, the first contactor 901 is controlled to be disconnected, the fourth contactor 904 is controlled to be attracted, and the energy storage system 3 is controlled to output DC power to the third line 12, and according to the order of the second user vehicles that have not completed charging in the second sorting result, the third contactors 903 of the corresponding charging piles are controlled to be attracted in sequence, so that the corresponding second user vehicles are powered and charged through the energy storage system 3.

[0085] Since the maximum power of the energy storage battery 301 is limited, if a large number of user vehicles need to be powered and charged by the energy storage system 3, the energy storage battery 301 may be insufficient. If the charging piles (the first charging pile 7 and the second charging pile 8) can input the reverse output current from the car battery into the corresponding bus, the DC / DC module 4 can also adjust the voltage of the reverse output current and then input it back into the energy storage system 3, and the energy storage system 3 can also store the direct current reversely input by the DC / DC module 4, then the battery of the user's vehicle can be used to reversely charge the energy storage system 3 (user consent is required and corresponding compensation is given) to alleviate the insufficient power of the energy storage battery 301.

[0086] Therefore, in some embodiments, the wheel charging pile system control method further includes the steps of:

[0087] A5. During the off-peak period, if a user vehicle chooses the electricity selling mode, the battery of the corresponding user vehicle is used to reverse charge the energy storage system 3 during the idle period.

[0088] The electricity selling mode refers to a mode of using the battery of the user's vehicle to reversely charge the energy storage system 3 and obtain corresponding rewards.

[0089] The user can confirm the power selling mode through the operation interface on the charging pile, or through a mobile terminal.

[0090] Among them, the idle period refers to the period when there are no user vehicles that need to be charged (including the two situations that there are no other user vehicles and all other user vehicles have completed charging).

[0091] Specifically, when the battery of the corresponding user vehicle is used to reversely charge the energy storage system 3, if the charging pile used by the corresponding user vehicle is the first charging pile 7, the fourth contactor 904 is controlled to be attracted, otherwise the fourth contactor 904 is controlled to be disconnected, and the first contactor 901 and the second contactor 902 are controlled to be disconnected. The corresponding charging pile inputs the output current of the battery of the corresponding user vehicle into the corresponding bus, and the DC / DC module 4 regulates the DC power of the bus and outputs it to the third line 12. The energy storage system 3 stores the DC power from the third line 12.

[0092] When the battery of the corresponding user vehicle is used to reversely charge the energy storage system 3, the electricity sold to the energy storage system 3 is also obtained and recorded as the first electricity sold, which is used to generate the first electricity sold settlement information and sent to the management platform for settlement processing. The first electricity sold settlement information includes part or all of the first electricity sold, electricity sold price, electricity sold amount, etc.

[0093] In some embodiments, the wheel charging pile system control method further includes the steps of:

[0094] A6. During the off-peak period, according to the historical charging information, the excess electricity in the energy storage system 3 is reversely supplied to the mains power grid 90 during the idle period.

[0095] By supplying power in reverse to the mains power grid 90 , the power supply pressure of the mains power grid 90 during the off-peak period can be alleviated.

[0096] The historical charging information includes the power usage rate of the energy storage system 3 for many historical days. In step A6, the power usage rate of the energy storage system 3 for today is estimated based on the historical charging information, and the excess power of the energy storage system 3 for today is calculated based on the power usage rate of the energy storage system 3 for today, and the excess power of the energy storage system 3 for today is reversely supplied to the city power grid 90 during the idle period.

[0097] When estimating the power usage rate of the energy storage system 3 today, the power usage rates of the most recent historical days can be extracted. Based on the extracted power usage rates, the average power usage rate is calculated as the power usage rate of the energy storage system 3 today, or the power usage rate of the energy storage system 3 today is estimated by curve fitting.

[0098] The excess power of the energy storage system 3 today can be calculated by the following formula: D=c*(1-a)*D1, where D1 is the maximum power of the energy storage system 3, a is the power utilization rate of the energy storage system 3 today, c is a proportional coefficient greater than 0 and less than 1 (set according to actual needs, for example, 0.8, but not limited to this), and D is the excess power of the energy storage system 3 today.

[0099] When the excess power in the energy storage system 3 is reversely supplied to the mains power grid 90, the first contactor 901 is controlled to be disconnected, and the second contactor 902 is controlled to be attracted, and the energy storage system 3 outputs direct current to the second line 11, and the AC / DC module 2 converts the direct current from the second line 11 into alternating current and then inputs it into the mains power grid 90. When the excess power in the energy storage system 3 is reversely supplied to the mains power grid 90, the power sales amount provided to the mains power grid 90 is also obtained, recorded as the second power sales amount, used to generate the second power sales settlement information, and sent to the management platform for settlement processing. The second power sales settlement information includes part or all of the second power sales amount, power sales price, power sales amount, etc.

[0100] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0101] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0103] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0104] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a wheel charging pile system, characterized in that: A main control module (1) applied to a wheel charging pile system, the wheel charging pile system comprising the main control module (1), an AC / DC module (2), an energy storage system (3), a DC / DC module (4), a first busbar (5), a second busbar (6), at least one first charging pile (7), at least one second charging pile (8) and a contactor assembly (9), the AC / DC module (2), the energy storage system (3), the DC / DC module (4), each of the first charging piles (7), each of the second charging piles (8) and the contactor assembly (9). 9) are all electrically connected to the main control module (1), the AC / DC module (2) is electrically connected to the first bus (5) and the energy storage system (3) via a first line (10) and a second line (11), respectively, the energy storage system (3) is electrically connected to the DC / DC module (4) via a third line (12), the DC / DC module (4) is also electrically connected to the second bus (6), all the first charging piles (7) are electrically connected to the first bus (5), and all the second charging piles (8) are electrically connected to the second bus (6); The AC / DC module (2) is capable of converting the mains electricity into direct current to supply power to the first bus (5) and the energy storage system (3); the energy storage system (3) is capable of storing direct current input from the second line (11) and outputting direct current to the third line (12); the DC / DC module (4) is capable of regulating the direct current from the third line (12) and then inputting it into the second bus (6); the contactor assembly (9) comprises a first contactor (901) arranged on the first line (10), a second contactor (902) arranged on the second line (11), a third contactor (903) arranged between each charging pile and the corresponding bus, and a fourth contactor (904) connected between the first bus (5) and the second bus (6); the main control module (1) is used to control the contactor assembly (9) to work so as to switch the power supply mode of each first charging pile (7) and each second charging pile (8); The wheel charging pile system control method comprises the steps of: A1. During the off-peak period, the energy storage system (3) is charged through the AC / DC module (2), and all user vehicles are charged in turn in the first power supply mode; the first power supply mode is to charge by powering the AC / DC module (2); A2. During the off-peak period, if all user vehicles choose the low-price charging mode, all user vehicles are charged in turn using the second power supply mode; the second power supply mode is to charge by powering the energy storage system (3); A3. During the off-peak period, if all user vehicles choose the high-price charging mode, all user vehicles will be charged in turn in the first power supply mode; A4. During the off-peak period, if some users choose the low-price charging mode and some choose the high-price charging mode, the users who choose the high-price charging mode will be charged in rotation with the first power supply mode, and the users who choose the low-price charging mode will be charged in rotation with the second power supply mode; Step A4 includes: A401. Sort the first user's vehicle by the order of the requested charging time to obtain a first sorting result; and sort the second user's vehicle by the order of the requested charging time to obtain a second sorting result; the first user's vehicle is a user's vehicle that selects a high-price charging mode, and the second user's vehicle is a user's vehicle that selects a low-price charging mode; A402. According to the first sorting result, each first user vehicle is charged in turn using the first power supply mode; A403. If the charging pile used by the first user vehicle currently being charged is the first charging pile (7), the fourth contactor (904) is disconnected, and before the first user vehicle currently being charged completes charging, the second user vehicle using the second charging pile (8) is charged in the second power supply mode in the order of priority in the second sorting result; A404. If the charging pile used by the first user vehicle currently being charged is the second charging pile (8), the fourth contactor (904) is controlled to be attracted, and the AC / DC module (2) is used to supply power to the first user vehicle currently being charged; A405. After all the first user vehicles have completed charging, if there are still second user vehicles that have not completed charging, the second user vehicles that have not completed charging are charged in sequence according to the second sorting result using the second power supply mode.

2. The wheel charging pile system control method according to claim 1, characterized in that: The energy storage system (3) comprises an energy storage battery (301) and a battery management system (302).

3. The wheel charging pile system control method according to claim 1, characterized in that: The charging pile can input the reverse output current from the vehicle battery into the corresponding busbar, the DC / DC module (4) can also adjust the voltage of the reverse output current and then input it in reverse into the energy storage system (3), and the energy storage system (3) can also store the direct current reversely input by the DC / DC module (4).

4. The wheel charging pile system control method according to claim 3, characterized in that: The energy storage system (3) can also output direct current in reverse to the AC / DC module (2), and the AC / DC module (2) can also convert the direct current output in reverse from the energy storage system (3) into alternating current for supply to the commercial power grid (90).

5. The wheel charging pile system control method according to claim 1, characterized in that: Step A1 includes: During the off-peak period, the second contactor (902) is controlled to be closed, thereby charging the energy storage system (3) through the AC / DC module (2); During the off-peak period, the first contactor (901) and the fourth contactor (904) are controlled to be closed, and the third contactor (903) corresponding to the charging pile used by each user vehicle is controlled to be closed in turn, so that all user vehicles are charged in turn in the first power supply mode.

6. The wheel charging pile system control method according to claim 1, characterized in that: Step A2 includes: During the off-peak period, if all user vehicles select the low-price charging mode, the first contactor (901) and the second contactor (902) are controlled to be disconnected, the fourth contactor (904) is controlled to be closed, and the third contactor (903) corresponding to the charging pile used by each user vehicle is controlled to be closed in turn, so that all user vehicles are charged in turn in the second power supply mode.

7. The wheel charging pile system control method according to claim 1, characterized in that: Step A3 includes: During the off-peak period, if all user vehicles select the high-price charging mode, the first contactor (901) and the fourth contactor (904) are controlled to be closed, the second contactor (902) is controlled to be disconnected, and the third contactor (903) corresponding to the charging pile used by each user vehicle is controlled to be closed in turn, so that all user vehicles are charged in turn in the first power supply mode.

8. The wheel charging pile system control method according to claim 1, characterized in that: Also includes the steps: A5. During the off-peak period, if a user vehicle selects the electricity selling mode, the battery of the corresponding user vehicle is used to reverse charge the energy storage system (3) during the idle period.

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