Direct current charging pile combined charging system

Abstract

The direct-current charging pile combined charging system comprises a control module and a switching module, and the switching module is connected with a plurality of direct-current charging piles through concentrated cables; the switching module is used for combining a charging power supply output by the direct-current charging pile to a concentrated cable in parallel and / or in series under the control of the control module so as to increase power to charge an electric vehicle; the control module comprises a master control MCU, a first CAN communication module and a second CAN communication module. The first CAN communication module is connected with a CAN communication port of a main control module of the direct current charging pile, and the second CAN communication module is connected with a charging gun S + and a charging gun S-through wires. According to the invention, the independent direct-current charging piles are combined and output so as to carry out high-power rapid charging on the electric vehicle, and the charging power is further dynamically distributed between the direct-current charging piles so as to realize a new energy vehicle charging flexible control technology.

Description

Technical Field

[0001] This application relates to the field of charging control technology, and in particular to the field of combined charging technology for DC charging piles for new energy vehicles. Background Technology

[0002] With the rapid development of new energy vehicle battery technology, electric vehicles have increasingly higher technical requirements for DC charging piles, among which the demand for high-power fast charging is the most urgent. However, due to the fact that the construction of charging stations in the past was mainly based on independent DC charging piles of around 60KW, many charging stations cannot meet the fast charging needs of new models that now require charging power of 200KW or more. In particular, with the increasing number of heavy-duty truck freight electric vehicles being launched, the requirements for charging power are even higher. However, the equipment manufacturing cost of high-power charging piles is expensive, the investment return cycle is long, and the promotion is limited. On the other hand, low-power old DC charging piles are idle, resulting in resource waste. They are inefficient to use and face elimination.

[0003] On the other hand, the existing technology for combining and distributing the output power of charging piles is the flexible charging technology of charging stacks. It uses a set of charging stacks with centralized output of high power and multiple charging guns to charge multiple electric vehicles. The output is dynamically adjusted according to the charging power demand of each electric vehicle, which can effectively distribute electrical energy to the corresponding electric vehicle and improve the efficiency of equipment use. Its drawbacks are high manufacturing cost, easy to be paralyzed by failure, lack of flexibility, and accelerated elimination of old charging stations, which wastes resources.

[0004] Therefore, unlike the existing flexible charging technology principles of charging piles, the technical challenge in this field is how to combine low-power independent DC charging piles to achieve high-power fast charging for electric vehicles. Furthermore, the technology to dynamically distribute power among the original independent DC charging piles without affecting their original independent charging function for electric vehicles, while exceeding their original maximum charging power to achieve fast charging for electric vehicles, is an even greater technical challenge in this field. Older charging stations urgently need this kind of transformation, but current technology cannot meet the requirements. Summary of the Invention

[0005] In view of the above technical background, the purpose of this application is to provide a DC charging pile combined charging system that combines the output power of multiple DC charging piles to quickly charge an electric vehicle, and dynamically distributes the output power among the combined charging DC charging piles to achieve the goal of not affecting their original independent charging function for electric vehicles, while exceeding their original maximum charging power for fast charging of electric vehicles. To achieve the above objectives, this application provides a DC charging pile combined charging system, including a control module and a switching module. The switching module connects multiple DC charging piles through a centralized cable. The switching module is used to combine the charging power output of the DC charging piles into the centralized cable in parallel and / or in series under the control of the control module to increase the charging power of the electric vehicle. The control module is communicatively connected to a cloud server and / or to multiple control modules.

[0006] Optionally, the switching module connects the charging power output terminal of the DC charging pile to the charging gun and the centralized cable to control the connection or disconnection of any two of the three.

[0007] Further optionally, the switching module includes a first switch and a second switch; one end of the first switch is connected to the output terminal of the charging power supply and the other end is connected to the central cable; one end of the second switch is connected to the output terminal of the charging power supply and the other end is connected to the charging gun.

[0008] Further optionally, a control cabinet is connected to the centralized cable, the control cabinet including one or more of the first and second switches combined to connect to the corresponding DC charging pile.

[0009] Optionally, the control cabinet includes a DC charging control module and a DC charging gun, used to combine the output power of multiple DC charging piles to quickly charge the trolley according to national standards.

[0010] Optionally, the control module includes a main control MCU, a first CAN communication module, and a second CAN communication module; the first CAN communication module is connected to the CAN communication port of the main control module of the DC charging pile, and the second CAN communication module is connected to the S+ and S- wires of the charging gun.

[0011] Optionally, the control module includes a voltage divider module controlled by the main control MCU; the voltage divider module is connected to the CC1 port of the main control module, and the voltage divider module is used to provide the main control module with a signal for the charging gun to connect to the trolley charging socket.

[0012] Optionally, the control module further includes a detection module; the detection module is connected to the CC1 line of the charging gun, and the detection module is used to provide the main control MCU with a signal as to whether the charging gun is connected to the trolley charging socket.

[0013] This application combines independent DC charging piles to provide high-power fast charging for electric vehicles, and further dynamically allocates charging power among the DC charging piles. This achieves a new technology for flexible control of new energy vehicle charging without affecting their original function of independently charging electric vehicles, while exceeding their original maximum charging power.

[0014] The present application and its working principle are further explained below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main circuit of the DC charging pile combined charging system according to an embodiment of this application; Figure 2 This is a schematic diagram of the controller circuit for a DC charging pile combined charging system according to an embodiment of this application; Figure 3 This is a schematic diagram of the main circuit of the DC charging pile combined charging system according to an embodiment of this application; Figure 4 This is a circuit diagram of the control module of the DC charging pile combined charging system according to an embodiment of this application. Detailed Implementation

[0016] This embodiment discloses a DC charging pile combined charging system, as shown in the attached figure. Figure 1 As shown, the system includes a first controller 4, a second controller 5, and a third controller 6, which are respectively connected to control the first DC charging pile 1, the second DC charging pile 2, and the third DC charging pile 3. It also includes a centralized control cabinet 7, which includes a first switching module connected to the first DC charging pile 1 via a centralized cable, and the first switching module includes a first contactor 8 and a second contactor 9; a second switching module connected to the second DC charging pile 2 via a centralized cable, and the second switching module includes a third contactor 10 and a fourth contactor 11; and a third switching module connected to the third DC charging pile 3 via a centralized cable, and the third switching module includes a fifth contactor 12 and a sixth contactor 13.

[0017] In this embodiment, as shown in the appendix Figure 1 As shown, the positive terminal D+_M of the DC charging power output of the first DC charging pile 1 is connected to the first contactor 8 and the second contactor 9 via a centralized cable and an anti-reverse-feedback diode. The other end of the first contactor 8 is connected to the positive terminal 14 of the combined power supply, while the other end of the second contactor 9 is connected to the D+_Q of the first DC charging pile 1, i.e., the D+ line of the charging gun. The negative terminal D-_M of the DC charging power output of the first DC charging pile 1 is connected to the D-_Q of the first DC charging pile 1, i.e., the D- line of the charging gun, and the negative terminal 15 of the combined power supply via a centralized cable. By controlling the on / off state of the first contactor 8 and the second contactor 9, the output power of the first DC charging pile 1 has the following four application states: State 1: When the first contactor 8 is turned on and the second contactor 9 is turned off, the output power of the first DC charging pile 1 is connected in parallel through the positive terminal 14 and the negative terminal 15 of the combined power supply, and the output power can be combined to charge other charging piles for electric vehicles. State 2: When the first contactor 8 is turned off and the second contactor 9 is turned on, the output power of the first DC charging pile 1 is connected back to the charging gun of the first DC charging pile 1, and the first DC charging pile 1 can charge the electric vehicle independently, retaining the original independent operation function of the first DC charging pile 1. State 3: When the first contactor 8 is turned on and the second contactor 9 is also turned on, the first DC charging pile 1 can combine the output power of other charging piles to charge the trolley at a higher power. State 4: When the first contactor 8 is turned off and the second contactor 9 is also turned off, the first DC charging pile 1 is in standby mode.

[0018] In this embodiment, as shown in the appendix Figure 1 As shown, the positive terminal D+_M of the DC charging power output of the second DC charging pile 2 is connected to the third contactor 10 and the fourth contactor 11 via a centralized cable and an anti-reverse-feedback diode. The other end of the third contactor 10 is connected to the positive terminal 14 of the combined power supply, while the other end of the fourth contactor 11 is connected to the D+_Q of the second DC charging pile 2, i.e., the D+ line of the charging gun. The negative terminal D-_M of the DC charging power output of the second DC charging pile 2 is connected to the D-_Q of the second DC charging pile 2, i.e., the D- line of the charging gun, and the negative terminal 15 of the combined power supply via a centralized cable. By controlling the on / off state of the third contactor 10 and the fourth contactor 11, the output power of the second DC charging pile 2 has the following four application states: State 1: When the third contactor 10 is turned on and the fourth contactor 11 is turned off, the output power of the second DC charging pile 2 is connected in parallel through the positive terminal 14 and the negative terminal 15 of the combined power supply, and the output power can be combined to charge other charging piles for electric vehicles. State 2: When the third contactor 10 is turned off and the fourth contactor 11 is turned on, the output power of the second DC charging pile 2 is connected back to the charging gun of the second DC charging pile 2, and the second DC charging pile 2 can charge the trolley independently, retaining the original independent operation function of the second DC charging pile 2. State 3: When the third contactor 10 is turned on and the fourth contactor 11 is also turned on, the second DC charging pile 2 can combine the output power of other charging piles to charge the trolley at a higher power. State 4: When the third contactor 10 is turned off and the fourth contactor 11 is also turned off, the second DC charging pile 2 is in standby mode.

[0019] In this embodiment, as shown in the appendix Figure 1As shown, the positive terminal D+_M of the DC charging power output of the third DC charging pile 3 is connected to the fifth contactor 12 and the sixth contactor 13 respectively via a centralized cable and an anti-reverse-feedback diode. The other end of the fifth contactor 12 is connected to the positive terminal 14 of the combined power supply, while the other end of the sixth contactor 13 is connected to the D+_Q of the third DC charging pile 3, i.e., the D+ line of the charging gun. The negative terminal D-_M of the DC charging power output of the third DC charging pile 3 is connected to the D-_Q of the third DC charging pile 3, i.e., the D- line of the charging gun, and the negative terminal 15 of the combined power supply via a centralized cable. By controlling the on / off state of the fifth contactor 12 and the sixth contactor 13, the output power of the third DC charging pile 3 has the following four application states: State 1: When the fifth contactor 12 is turned on and the sixth contactor 13 is turned off, the output power of the third DC charging pile 3 is connected in parallel through the positive terminal 14 and the negative terminal 15 of the combined power supply, and the output power can be combined to charge other charging piles for electric vehicles. State 2: When the fifth contactor 12 is turned off and the sixth contactor 13 is turned on, the output power of the third DC charging pile 3 is connected back to the charging gun of the third DC charging pile 3, and the third DC charging pile 3 can charge the trolley independently, retaining the original independent operation function of the third DC charging pile 3. State 3: When the fifth contactor 12 is turned on and the sixth contactor 13 is also turned on, the third DC charging pile 3 can combine the output power of other charging piles to charge the trolley at a higher power. State 4: When the fifth contactor 12 is turned off and the sixth contactor 13 is also turned off, the first DC charging pile 1 is in standby mode.

[0020] The DC charging pile combined charging system disclosed in this embodiment includes a fourth controller 16 installed in the centralized control cabinet 7. The centralized control cabinet 7 also includes a DC charging gun 17, a seventh contactor 18, and an eighth contactor 19. The D+ line of the DC charging gun 17 is connected to the seventh contactor 18, and the D- line is connected to the eighth contactor 19. The other end of the seventh contactor 18 is connected to the positive terminal 14 of the combined power supply, and the other end of the eighth contactor 19 is connected to the negative terminal 15 of the combined power supply. The fourth controller 16 is connected to the DC charging gun 17 according to national standards. The on / off control coils of the eight contactors from the first contactor 8 to the eighth contactor 19 are respectively connected to the fourth controller 16. The fourth controller 16 is communicatively connected to a cloud server and forms a communication network with the first controller 4, the second controller 5, and the third controller 6 via a 485 bus or a CAN bus to exchange information.

[0021] This embodiment discloses a DC charging pile combined charging system, wherein the first controller 4, the second controller 5, and the third controller 6 are as shown in the attached figure. Figure 2As shown, the system includes a main control MCU 20, a first CAN communication module 21, a second CAN communication module 22, a voltage divider module 23, and a detection module 24. The main control MCU 20 contains dual CAN controllers, which, together with external CAN transceiver chips, form the first CAN communication module 21 and the second CAN communication module 22. The first CAN communication module 21 connects to the CAN_H_M and CAN_L_M ports of the corresponding DC charging pile main control module to enable communication message exchange between the main control MCU 20 and the DC charging pile main control module according to national standards. The second CAN communication module 22 connects to the CAN_H_M and CAN_L_M ports of the DC charging pile's charging gun, i.e., to the S+ and S- wires of the charging gun, to enable communication message exchange between the main control MCU 20 and the vehicle controller of the trolley according to national standards. The main control MCU20 can send the communication messages received from the DC charging pile main control module to the vehicle controller, or send the communication messages received from the vehicle controller to the DC charging pile main control module. Then, according to the charging power requirements sent by the fourth controller 16, the content of the communication messages is modified according to the national standard to achieve charging control.

[0022] In this embodiment, the voltage divider module 23 is connected to the main control MCU 20. When the OUT port of the main control MCU 20 outputs a high level, the MOS transistor Q is turned on. The 1000-ohm resistor R1 is connected to the CC1_M port of the DC charging pile main control module. The DC charging pile main control module can detect a signal equivalent to the charging gun being connected to the electric vehicle charging dock. The detection module 24 is connected to the CC1_Q port of the DC charging pile, i.e., the CC1 line of the charging gun. When the charging gun is connected to the electric vehicle charging dock, the voltage of the ADC port changes. The main control MCU 20 can determine whether the charging gun is connected to the electric vehicle charging dock by detecting the voltage value of the ADC port. When the charging gun is not connected to the electric vehicle charging dock, if the main control MCU 20 receives a power output request from the fourth controller 16, it can control the OUT port to output a high level so that the DC charging pile main control module can detect the signal that the charging gun is connected to the electric vehicle charging dock. According to the voltage and current values ​​required for power output, the main control MCU 20 communicates with the DC charging pile main control module through the first CAN communication module 21 according to national standards, thereby inducing the DC charging pile main control module to control the output of power to the central control cabinet 7. When the charging gun is connected to the EV charging dock, the main control MCU 20 detects the connection signal through the detection module 24. It then controls the OUT port to output a high level, allowing the DC charging pile main control module to detect the connection. The MCU 20 then sends the received communication message from the DC charging pile main control module to the vehicle controller via the second CAN communication module 22, and the received communication message from the vehicle controller to the DC charging pile main control module via the first CAN communication module 21. The main control MCU 20 does not modify the content of the communication message, thus ensuring the original charging function of the charging pile remains unchanged. If the power demand of the vehicle controller exceeds the maximum output power of the charging pile, the main control MCU 20 sends information to the fourth controller 16, and then modifies the content of the communication message according to national standards based on the information from the fourth controller 16 to achieve charging control.

[0023] In this embodiment, one of the three controllers—first controller 4, second controller 5, and third controller 6—exchanges communication messages with the trolley according to national standards to obtain the corresponding trolley's charging power requirement, and then sends it to the fourth controller 16. The fourth controller 16 can also obtain the corresponding trolley's charging power requirement by exchanging communication messages with the corresponding trolley through the DC charging gun 17 according to national standards. After obtaining the trolley's charging power requirement, the fourth controller 16 determines the main charging pile and auxiliary charging pile and their corresponding output current and voltage to provide charging for the trolley. The main charging pile is connected to the trolley for charging, and the auxiliary charging pile connects the output power to the main charging pile through a centralized cable to increase the charging power of the trolley. The centralized control cabinet 7 can serve as the main charging pile to combine the output power of any one or more of the first DC charging pile 1, second DC charging pile 2, and third DC charging pile 3. The fourth controller 16 precisely controls the corresponding charging pile to output power according to the required power through communication connections with the first controller 4, second controller 5, and third controller 6, and then quickly charges the trolley through the DC charging gun 17 according to national standards. Any one of the three DC charging piles 1, 2, and 3 can be used as the main charging pile, while the other two or one charging pile can be used as the auxiliary charging pile. The fourth controller 16, based on the charging power requirements of the electric vehicle, precisely controls the corresponding charging pile to output power according to the required power through communication connection with the corresponding first controller 4, second controller 5, and third controller 6, and then combines their output power to meet the charging power requirements of the electric vehicle.

[0024] The DC charging pile combined charging system disclosed in this embodiment adds a controller to the three DC charging piles that were originally used independently to achieve networked intelligent charging control. Then, the output power is combined to the central control cabinet for intelligent switching through a centralized cable. This realizes the combined output power of each charging pile to charge the electric vehicle at high power and fast speed. Furthermore, it dynamically distributes the charging power among the DC charging piles. This does not affect the original function of the charging piles to charge the electric vehicle independently, and allows the charging piles to combine the output power of other charging piles to charge the electric vehicle quickly beyond their original independent maximum charging power.

[0025] The DC charging pile combined charging system disclosed in this embodiment allows charging stations to upgrade existing, independently used low-power charging piles to supercharging with low investment, avoiding the high investment required to purchase new equipment, and also achieving the goal of high-power fast charging for electric vehicles, especially heavy trucks.

[0026] The national standards mentioned in this embodiment refer to Chinese standard GB / T 18487.1-2023 Electric Vehicle Conductive Charging System Part 1: General Requirements and Chinese standard GB / T 27930-2023 Digital Communication Protocol between Off-board Conductive Chargers and Electric Vehicles, as well as other relevant national standards. This embodiment is accompanied by... Figure 1 Appendix Figure 2These are not complete circuit diagrams, but rather schematic diagrams of circuit principles, used to help understand the technical solutions of this embodiment. (See attached diagram.) Figure 1 Appendix Figure 2 Based on this, those skilled in the art can derive a complete circuit schematic and implement this embodiment. Detailed Implementation

[0027] This embodiment discloses a DC charging pile combined charging retrofit system, which retrofits three DC charging piles that meet national standards to combine charging technology. The system includes a first combined charging control cabinet that controls a fourth DC charging pile 31 via a centralized cable; a second combined charging control cabinet that controls a fifth DC charging pile 32 via a centralized cable; and a third combined charging control cabinet that controls a sixth DC charging pile 33 via a centralized cable. (See attached...) Figure 3 As shown, the first combined charging control cabinet is equipped with a first control module 34 and a fourth switching module 35, the fourth switching module 35 including a ninth contactor 36 and a tenth contactor 37; the second combined charging control cabinet is equipped with a second control module 46 and a fifth switching module 38, the fifth switching module 38 including an eleventh contactor 39 and a twelfth contactor 40; the third combined charging control cabinet is equipped with a third control module 47 and a sixth switching module 41, the sixth switching module 41 including a thirteenth contactor 42 and a fourteenth contactor 43; each DC charging pile and its corresponding control cabinet are connected by a centralized cable. Figure 3 The circuits shown are interconnected. The first control module 34 and the second control module 46, together with the third controller 47, form a communication network to exchange information and communicate with the cloud server via a 485 bus or a CAN bus.

[0028] In this embodiment, as shown in the appendix Figure 3 As shown, the positive terminal D+_M of the DC charging power output of the fourth DC charging pile 31 is connected to the ninth contactor 36 and the tenth contactor 37 respectively via a centralized cable and an anti-reverse-feedback diode. The other end of the ninth contactor 36 is connected to the positive terminal 44 of the parallel power supply, while the other end of the tenth contactor 37 is connected to the D+_Q of the fourth DC charging pile 31, i.e., the D+ line of the charging gun. The negative terminal D-_M of the DC charging power output of the fourth DC charging pile 31 is connected to the D-_Q of the fourth DC charging pile 31, i.e., the D- line of the charging gun, and the negative terminal 45 of the parallel power supply via a centralized cable. By controlling the on / off state of the ninth contactor 36 and the tenth contactor 37, the output power of the fourth DC charging pile 31 has the following four application states.

[0029] State 1: When the ninth contactor 36 is turned on and the tenth contactor 37 is turned off, the output power of the fourth DC charging pile 31 is connected in parallel with the negative terminal 45 of the parallel power supply through the positive terminal 44 of the parallel power supply, and the output power can be combined to charge the electric vehicle by other charging piles. State 2: When the ninth contactor 36 is turned off and the tenth contactor 37 is turned on, the output power of the fourth DC charging pile 31 is connected back to the charging gun of the fourth DC charging pile 31, and the fourth DC charging pile 31 can charge the trolley independently, retaining the original independent operation function of the fourth DC charging pile 31. State 3: When the ninth contactor 36 is turned on and the tenth contactor 37 is also turned on, the fourth DC charging pile 31 can combine the output power of other charging piles to charge the trolley at a higher power. State 4: When the ninth contactor 36 is turned off and the tenth contactor 37 is also turned off, the fourth DC charging pile 31 is in standby mode. In this embodiment, as shown in the appendix Figure 3 As shown, the positive terminal D+_M of the DC charging power output of the fifth DC charging pile 32 is connected to the eleventh contactor 39 and the twelfth contactor 40 respectively via a centralized cable and an anti-reverse-feeding diode. The other end of the eleventh contactor 39 is connected to the positive terminal 44 of the parallel power supply, while the other end of the twelfth contactor 40 is connected to the D+_Q of the fifth DC charging pile 32, i.e., the D+ line of the charging gun. The negative terminal D-_M of the DC charging power output of the fifth DC charging pile 32 is connected to the D-_Q of the fifth DC charging pile 32, i.e., the D- line of the charging gun, and the negative terminal 45 of the parallel power supply via a centralized cable. By controlling the on / off state of the eleventh contactor 39 and the twelfth contactor 40, the output power of the fifth DC charging pile 32 has the following four application states. State 1: When the eleventh contactor 39 is turned on and the twelfth contactor 40 is turned off, the output power of the fifth DC charging pile 32 is connected in parallel through the positive terminal 44 and the negative terminal 45 of the parallel power supply, and the output power can be combined to charge the electric vehicle for other charging piles. State 2: When the eleventh contactor 39 is turned off and the twelfth contactor 40 is turned on, the output power of the fifth DC charging pile 32 is connected back to the charging gun of the fifth DC charging pile 32, and the fifth DC charging pile 32 can charge the tram independently, retaining the original independent operation function of the fifth DC charging pile 32. State 3: When the eleventh contactor 39 is turned on and the twelfth contactor 40 is also turned on, the fifth DC charging pile 32 can combine the output power of other charging piles to charge the trolley at a higher power. State 4: When the eleventh contactor 39 is turned off and the twelfth contactor 40 is also turned off, the fifth DC charging pile 32 is in standby mode.

[0030] In this embodiment, as shown in the appendix Figure 3As shown, the positive terminal D+_M of the DC charging power output of the sixth DC charging pile 33 is connected to the thirteenth contactor 42 and the fourteenth contactor 43 respectively via a centralized cable and an anti-reverse-feeding diode. The other end of the thirteenth contactor 42 is connected to the positive terminal 44 of the parallel power supply, while the other end of the fourteenth contactor 43 is connected to the D+_Q of the sixth DC charging pile 33, i.e., the D+ line of the charging gun. The negative terminal D-_M of the DC charging power output of the sixth DC charging pile 33 is connected to the D-_Q of the sixth DC charging pile 33, i.e., the D- line of the charging gun, and the negative terminal 45 of the parallel power supply via a centralized cable. By controlling the on / off state of the thirteenth contactor 42 and the fourteenth contactor 43, the output power of the sixth DC charging pile 33 has the following four application states. State 1: When the thirteenth contactor 42 is turned on and the fourteenth contactor 43 is turned off, the output power of the sixth DC charging pile 33 is connected in parallel through the positive terminal 44 and the negative terminal 45 of the parallel power supply, and the output power can be combined to charge the electric vehicle for other charging piles. State 2: When the thirteenth contactor 42 is turned off and the fourteenth contactor 43 is turned on, the output power of the sixth DC charging pile 33 is connected back to the charging gun of the sixth DC charging pile 33, and the sixth DC charging pile 33 can charge the trolley independently, retaining the original independent operation function of the sixth DC charging pile 33. State 3: When the thirteenth contactor 42 is turned on and the fourteenth contactor 43 is also turned on, the sixth DC charging pile 33 can combine the output power of other charging piles to charge the trolley at a higher power. State 4: When the thirteenth contactor 42 is turned off and the fourteenth contactor 43 is also turned off, the fourth DC charging pile 31 is installed in standby mode.

[0031] This embodiment discloses a DC charging pile combined charging system, the first control module 34, the second control module 46, and the third control module 47 of which are shown in the attached figure. Figure 4As shown, the system includes a main control processor 48, a third CAN communication module 49, a fourth CAN communication module 50, a signal module 51, a detection module 52, and a switch module 53 for controlling the contactor's on / off state. The main control processor 48 contains dual CAN controllers, which, together with external CAN transceiver chips, form the third CAN communication module 49 and the fourth CAN communication module 50. The third CAN communication module 49 connects to the CAN_H_M and CAN_L_M ports of the corresponding DC charging pile main control module to enable communication message exchange between the main control processor 48 and the DC charging pile main control module according to national standards. The fourth CAN communication module 50 connects to the CAN_H_M and CAN_L_M ports of the DC charging pile's charging gun, i.e., to the S+ and S- wires of the DC charging pile's charging gun, to enable communication message exchange between the main control processor 48 and the vehicle controller of the trolley according to national standards. The main control processor 48 can send the communication messages received from the DC charging pile main control module to the vehicle controller, or send the communication messages received from the vehicle controller to the DC charging pile main control module, and then modify the content of the communication messages according to national standards based on the charging demand information to achieve charging control.

[0032] In this embodiment, signal module 51 is connected to main control processor 48. When the OUT port of main control processor 48 outputs a high level, MOSFET Q is turned on. A 1000-ohm resistor R1 is connected to the CC1_M port of the DC charging pile main control module. The DC charging pile main control module can detect a signal equivalent to the charging gun being connected to the electric vehicle charging dock. Detection module 52 is connected to the CC1_Q port of the DC charging pile, i.e., the CC1 line of the charging gun. When the charging gun is connected to the electric vehicle charging dock, the voltage at the ADC port changes. The main control processor 48 can then determine whether the charging gun is connected to the electric vehicle charging dock by detecting the voltage value at the ADC port. When the charging gun is not connected to the EV charging dock, if the main control processor 48 receives a power output request from the cloud server or the main control processor of another charging pile, it can control the OUT port to output a high level, allowing the DC charging pile main control module to detect the signal that the charging gun is connected to the EV charging dock. Then, according to the required voltage and current values ​​for power output, it communicates with the DC charging pile main control module via the third CAN communication module 49 according to national standards, thereby inducing the DC charging pile main control module to control the output of power to the centralized cable. When the charging gun is connected to the EV charging dock, the main control processor 48 detects the signal through the detection module 52. It then controls the OUT port to output a high level, allowing the DC charging pile main control module to detect the signal. It then sends the received communication message from the DC charging pile main control module to the vehicle controller via the fourth CAN communication module 50, and sends the received communication message from the vehicle controller to the DC charging pile main control module via the third CAN communication module 49. The main control processor 48 does not modify the content of the communication messages, thus ensuring that the original charging function of the charging pile remains unchanged. If the power demand of the vehicle controller exceeds the maximum output power of the charging pile, the main control processor 48 sends information to the main control processors of other charging piles to control the output power to be combined into the centralized cable to meet the power demand of the vehicle controller.

[0033] In this embodiment, after one of the three control modules—first control module 34, second control module 46, and third control module 47—exchanges communication messages with the trolley according to national standards to obtain the corresponding trolley's charging power requirements, it determines the main charging pile and auxiliary charging pile, along with their corresponding output current and voltage, to provide charging for the trolley. The main charging pile connects to the trolley for charging, while the auxiliary charging pile connects its output power in parallel to the main charging pile via a centralized cable to increase the charging power for the trolley. Any one of the four DC charging piles—fourth DC charging pile 31, fifth DC charging pile 32, and sixth DC charging pile 33—can serve as the main charging pile, while the other two or one charging pile can serve as auxiliary charging piles. The first control module 34, second control module 46, and third control module 47 can all communicate with each other and precisely control the corresponding charging piles to output power according to the required power, merging their output power to meet the trolley's charging power requirements.

[0034] The DC charging pile merging and charging transformation system disclosed in this embodiment adds a control cabinet to each of the three DC charging piles that were originally used independently and connects them to the network for intelligent charging control. Then, the output power is merged through a centralized cable to realize high-power fast charging of electric vehicles. The charging power is dynamically distributed among the DC charging piles, which does not affect the original function of the charging piles to charge electric vehicles independently, and allows the charging piles to merge the output power of other charging piles to exceed their original maximum charging power in an independent state for fast charging of electric vehicles.

[0035] The DC charging pile merging and charging transformation system disclosed in this embodiment allows charging stations to carry out low-investment supercharging transformation using old, independently used low-power charging piles, avoiding the high investment of purchasing new equipment, and can also achieve the purpose of high-power fast charging for electric vehicles, especially heavy trucks.

[0036] The national standards mentioned in this embodiment refer to Chinese standard GB / T 18487.1-2023 Electric Vehicle Conductive Charging System Part 1: General Requirements and Chinese standard GB / T 27930-2023 Digital Communication Protocol between Off-board Conductive Chargers and Electric Vehicles, as well as other relevant national standards. This embodiment is accompanied by... Figure 3 Appendix Figure 4 These are not complete circuit diagrams, but rather schematic diagrams of circuit principles, used to help understand the technical solutions of this embodiment. (See attached diagram.) Figure 3 Appendix Figure 4 Based on this, those skilled in the art can derive a complete circuit schematic and implement this embodiment.

[0037] The above provides a detailed description of the DC charging pile combined charging system provided in this application. The description of this embodiment is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A DC charging pile combined with a charging system, characterized by: It includes a control module and a switching module. The switching module is connected to multiple DC charging piles through a centralized cable. The switching module is used to increase the charging power output of the DC charging piles to the centralized cable in parallel and / or in series under the control of the control module, thereby increasing the charging power of the electric vehicle. The control module is communicatively connected to a cloud server and / or to multiple control modules.

2. The DC charging pile combined charging system as described in claim 1, characterized in that: The switching module connects the charging power output terminal of the DC charging pile to the charging gun and the centralized cable to control the connection or disconnection of any two of the three.

3. The DC charging pile combined charging system as described in claim 2, characterized in that: The switching module includes a first switch and a second switch; one end of the first switch is connected to the output terminal of the charging power supply and the other end is connected to the centralized cable; one end of the second switch is connected to the output terminal of the charging power supply and the other end is connected to the charging gun.

4. The DC charging pile combined charging system as described in claim 3, characterized in that: The control cabinet includes a central cable connected to a control cabinet, and the control cabinet includes one or more combinations of the first switch and the second switch connected to the corresponding DC charging pile.

5. The DC charging pile combined charging system as described in claim 4, characterized in that: The control cabinet includes a DC charging control module and a DC charging gun, which are used to combine the output power of multiple DC charging piles to quickly charge the electric vehicle according to national standards.

6. The DC charging pile combined charging system as described in any one of claims 1 to 5, characterized in that: The control module includes a main control MCU, a first CAN communication module, and a second CAN communication module; the first CAN communication module is connected to the CAN communication port of the main control module of the DC charging pile, and the second CAN communication module is connected to the S+ and S- wires of the charging gun.

7. The DC charging pile combined charging system as described in claim 6, characterized in that: The control module includes a voltage divider module controlled by the main control MCU; the voltage divider module is connected to the CC1 port of the main control module, and the voltage divider module is used to provide the main control module with a signal for the charging gun to connect to the electric vehicle charging dock.

8. The DC charging pile combined charging system as described in claim 7, characterized in that: The control module also includes a detection module; the detection module is connected to the CC1 line of the charging gun, and the detection module is used to provide the main control MCU with a signal as to whether the charging gun is connected to the trolley charging socket.

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