Flexible charging module and charging pile system

Abstract

The invention relates to a flexible charging module and a charging pile system. The flexible charging module comprises a control panel; the control panel comprises a CP (Control Pilot Function) circuit, a communication circuit and a single chip microcomputer; after receiving a charging request sent by an external device to be charged, the single chip microcomputer sends the charging request to the power grid control platform through the communication circuit, receives a control instruction returned by the power grid control platform and outputs a control signal to the CP circuit; the CP circuit controls the output power and the charging time sequence for charging the to-be-charged device based on the control signal; the module can interact with a power grid, can realize intelligent adjustment of charging power, has relatively high flexibility and adaptability, can realize data acquisition and communication functions through the module, and can realize butt joint with a power grid control platform to realize interaction between the electric vehicle and the power grid.

Description

Technical Field

[0001] The present invention relates to the field of charging piles, and in particular to a flexible charging module and a charging pile system. Background Art

[0002] The concept of dual carbons is carbon peak and carbon neutrality. Carbon peak means that at a certain point in time, carbon dioxide emissions no longer grow and reach a peak, and then gradually decline; carbon neutrality refers to the total amount of carbon dioxide or greenhouse gas emissions directly or indirectly generated by a country, enterprise, product, activity or individual within a certain period of time. Through afforestation, energy conservation and emission reduction, etc., the carbon dioxide or greenhouse gas emissions generated by themselves can be offset to achieve positive and negative offset and achieve relative "zero emissions".

[0003] At present, by analyzing the carbon emissions of vehicles during the use phase, we promote the application of low-emission green technologies and green products, strive to comprehensively reduce or lower the impact of automobile use on the environment, avoid or reduce damage to the environment, advocate nature and protect the ecology, cultivate green consumption habits and low-carbon travel concepts among automobile users, and enhance the green consumption capacity of the entire society.

[0004] "Intelligent, connected + electric" is the direction of future transportation and automobile development. The rapid development of electric vehicles is in line with the requirements of establishing long-distance green transportation. At present, intelligent and orderly charging facilities are being promoted on the market. In principle, new charging piles will uniformly adopt intelligent and orderly charging piles, and the intelligent transformation of existing charging piles will be promoted as needed.

[0005] With the further advancement of new energy vehicle industry policies, the number of electric vehicles is increasing rapidly, and a large number of electric vehicle charging needs have emerged in residential communities. The nighttime vehicle charging period overlaps with the evening peak of residents' electricity consumption, resulting in a sudden increase in the electricity load in the substation area, which has an increasingly serious impact on the substation transformer. Such conflicts are becoming increasingly prominent, not only seriously affecting residents' normal life electricity consumption, but also increasing the safety risks of residents' electricity use due to insufficient distribution network transformer capacity. Summary of the invention

[0006] In view of the technical problems existing in the prior art, the present invention provides a flexible charging module and a charging pile, which can realize intelligent adjustment of charging power and have high flexibility and adaptability.

[0007] According to a first aspect of the present invention, a flexible charging module and a charging pile are provided, comprising: a control board; the control board comprises: a CP circuit, a communication circuit and a single-chip microcomputer; After receiving the charging request from the external device to be charged, the single chip microcomputer sends the charging request to the power grid control platform through the communication circuit, receives the control instruction returned by the power grid control platform, and outputs a control signal to the CP circuit; The CP circuit controls the output power and charging sequence of the device to be charged based on the control signal.

[0008] Based on the above technical solution, the present invention can also make the following improvements.

[0009] Optionally, the CP circuit includes: an N-channel field effect transistor Q1, a PNP-type transistor Q2, a P-channel field effect transistor Q3, an NPN-type transistor Q4, a diode D1, and a bidirectional TVS diode D2; The anode of the diode D1 is connected to one end of the bidirectional TVS diode D2, the other end of the bidirectional TVS diode D2 is grounded, the cathode of the diode D1 is connected to the pin MCU_CP of the microcontroller outputting the control signal through the resistor R8, and the MCU_CP is also grounded through the resistor R11 and the capacitor C12 connected in parallel; The D pole of the N-channel field effect transistor Q1 is connected to the positive pole of the diode D1 through the resistor R4, the S pole of the N-channel field effect transistor Q1 is connected to the -12V voltage, the resistor R1 is connected between the S pole and the G pole of the N-channel field effect transistor Q1, and the G pole of the N-channel field effect transistor Q1 is also connected to the C pole of the PNP transistor Q2; The D pole of the P-channel field effect transistor Q3 is connected to the positive pole of the diode D1 through the resistor R7, the S pole of the P-channel field effect transistor Q3 is connected to the +12V voltage, a resistor R10 is connected between the S pole and the G pole of the P-channel field effect transistor Q3, and the G pole of the P-channel field effect transistor Q3 is also connected to the C pole of the NPN transistor Q4; The E pole of the PNP transistor Q2 is connected to the +3.3V voltage after passing through the resistor R6, and the B pole of the PNP transistor Q2 is connected to one end of the resistor R5; the E pole of the NPN transistor Q4 is grounded after passing through the resistor R12, and the B pole of the NPN transistor Q4 is connected to one end of the resistor R9; the other ends of the resistor R6 and the resistor R9 are connected and serve as the output end of the PWM signal for controlling the charging current.

[0010] Optionally, the communication circuit is an RS485 communication circuit.

[0011] Optionally, the main control board further includes: an emergency stop circuit; The emergency stop circuit includes an emergency stop switch. When the emergency stop circuit detects that the emergency stop button is pressed, it sends an emergency stop message to the single-chip microcomputer. After receiving the emergency stop message, the single-chip microcomputer stops charging by controlling the CP circuit.

[0012] Optionally, the flexible charging module further includes: an output board; The output board includes: a power metering circuit and a relay circuit; The power metering circuit is used to measure the voltage and current of the device to be charged and measure the power when charging, and transmit the power data to the single chip microcomputer; The relay circuit is used to control the on / off of the neutral line and the live line in the charging circuit.

[0013] Optionally, the main control board also includes: a CP transfer indicator light board connected to the single-chip computer and the CP circuit; the CP transfer indicator light board includes: a charging status indicator light, a vehicle computer communication indicator light and a fault emergency stop light.

[0014] Optionally, the process of generating the control instruction after the grid control receives the charging request sent by the single-chip microcomputer includes: Determine whether the transformer in the substation has an overload warning, and if so, generate the control instruction for charging according to the first set charging power, otherwise generate the control instruction for charging according to the second set charging power; the first set charging power is less than the second set charging power.

[0015] According to a second aspect of the present invention, a charging pile system is provided, comprising: a plurality of charging piles and a power grid control platform installed in a set area; the charging piles include a flexible charging module; when the power grid control platform receives a charging request sent by one or more of the charging piles, the current power grid load in the set area is collected: When the current power grid meets or exceeds a first set threshold, generating the control instruction for starting charging at a future set time to each of the charging piles; When the current power grid meets the condition that the current power grid is less than the first set threshold and greater than or equal to the second set threshold, the control instruction for charging according to the first set charging power is generated, and each control instruction is issued in sequence according to the time when the charging request message is received and the charging completion time; When the current power grid meets the requirement of being less than a second set threshold, the control instruction for charging according to the second set charging power is generated; the first set threshold is greater than the second set threshold, and the first set charging power is less than the second set charging power.

[0016] The present invention provides a flexible charging module and charging pile system, which can interact with the power grid and realize intelligent adjustment of charging power. It has high flexibility and adaptability. The module of the present invention can realize data collection and communication functions, and can be connected with the power grid control platform to realize the interaction between electric vehicles and the power grid. The module is compatible with 3.3kW and 7kW on-board chargers of various specifications. The maximum charging power is 7 kilowatts and the minimum is 1.3 kilowatts. It can realize flexible control and orderly charging during peak power consumption; it can enable users to interact with the device conveniently to realize plug-and-play and orderly charging functions. The module of the present invention has overvoltage protection, undervoltage protection, overload protection, short circuit protection, leakage protection, and grounding protection to ensure safe and reliable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A circuit schematic diagram of a CP circuit in a flexible charging module provided in an embodiment of the present invention; Figure 2 A circuit schematic diagram of an RS485 communication circuit in a flexible charging module provided in an embodiment of the present invention; Figure 3 A circuit schematic diagram of a single-chip microcomputer peripheral circuit in a flexible charging module provided by an embodiment of the present invention; Figure 4 A circuit schematic diagram of an indicator light in a flexible charging module provided by an embodiment of the present invention; Figure 5 A circuit schematic diagram of an emergency stop circuit in a flexible charging module provided in an embodiment of the present invention; Figure 6 A circuit schematic diagram of a ±12V power supply in a flexible charging module provided in an embodiment of the present invention; Figure 7 A circuit schematic diagram of a connection terminal in a flexible charging module provided in an embodiment of the present invention; Figure 8 A circuit schematic diagram of a power metering circuit in a flexible charging module provided by an embodiment of the present invention; Fig. 9 A circuit schematic diagram of a relay circuit in a flexible charging module provided by an embodiment of the present invention; Fig.10 A schematic diagram of the installation and connection of a charging pile system provided by the present invention. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] The present invention provides a flexible charging module, comprising: a control board; the control board comprises: a CP circuit, a communication circuit and a single-chip microcomputer. Flexible charging module control board. The module can be connected to the main station of the power grid control platform through the communication module to execute control instructions. The module will adjust the charging sequence or control to automatically reduce the charging power according to the orderly charging strategy issued by the platform through the main station.

[0020] After receiving the charging request from the external device to be charged, the single chip microcomputer sends the charging request to the power grid control platform through the communication circuit, receives the control command returned by the power grid control platform, and outputs the control signal to the CP circuit.

[0021] The CP circuit controls the output power and charging sequence of the device to be charged based on the control signal.

[0022] In view of the fact that various types of AC charging piles currently do not have the functions of interacting with the power grid and flexibly adjusting the charging power of electric vehicles, it is impossible to realize intelligent adjustment of charging power, and it is also impossible to realize orderly flexible charging. Based on the above needs, the present invention provides a flexible charging module and charging pile system, which has the functions of interacting with the power grid and realizing flexible adjustment of charging power, thereby realizing flexible and orderly charging, meeting the overall control of the charging load by the power grid, and realizing the measurable, adjustable and controllable charging load of the community, ensuring that both the safety of power grid operation and the charging needs of electric vehicles are met, and realizing orderly charging of electric vehicles while ensuring the normal and stable power consumption of residents, which has broad promotion significance. Example 1 Embodiment 1 provided by the present invention is an embodiment of a flexible charging module provided by the present invention, combined with Figure 1-Figure 10 It can be known that an embodiment of the flexible charging module includes: including: a control board; the control board includes: a CP circuit, a communication circuit and a single-chip microcomputer.

[0023] After receiving the charging request from the external device to be charged, the single chip microcomputer sends the charging request to the power grid control platform through the communication circuit, receives the control command returned by the power grid control platform, and outputs the control signal to the CP circuit.

[0024] The CP circuit controls the output power and charging sequence of the device to be charged based on the control signal.

[0025] In a possible embodiment, the CP circuit includes: an N-channel field effect transistor Q1, a PNP transistor Q2, a P-channel field effect transistor Q3, an NPN transistor Q4, a diode D1, and a bidirectional TVS diode D2.

[0026] The model of N-channel field effect transistor Q1 is 2N7002 N-channel SOT-23, and the model of transistor Q2 is SS8550 Y2. The model of P-channel field effect transistor Q3 is BSSL84SL P-channel SOT-23. The model of transistor Q4 is SS8550 Y1. The model of diode D1 is IN4148WS T4. The model of bidirectional TVS diode D2 is SMBJ15CA 600W.

[0027] The anode of diode D1 is connected to one end of bidirectional TVS diode D2, the other end of bidirectional TVS diode D2 is grounded, the cathode of diode D1 is connected to the pin MCU_CP of microcontroller output control signal through resistor R8, and MCU_CP is also grounded through resistor R11 and capacitor C12 connected in parallel.

[0028] The D pole of the N-channel field effect transistor Q1 is connected to the positive pole of the diode D1 through the resistor R4, the S pole of the N-channel field effect transistor Q1 is connected to the -12V voltage, the resistor R1 is connected between the S pole and the G pole of the N-channel field effect transistor Q1, and the G pole of the N-channel field effect transistor Q1 is also connected to the C pole of the PNP transistor Q2.

[0029] The D pole of the P-channel field effect transistor Q3 is connected to the positive pole of the diode D1 through the resistor R7, the S pole of the P-channel field effect transistor Q3 is connected to the +12V voltage, a resistor R10 is connected between the S pole and the G pole of the P-channel field effect transistor Q3, and the G pole of the P-channel field effect transistor Q3 is also connected to the C pole of the NPN transistor Q4.

[0030] The E pole of the PNP transistor Q2 is connected to the +3.3V voltage after passing through the resistor R6, and the B pole of the PNP transistor Q2 is connected to one end of the resistor R5; the E pole of the NPN transistor Q4 is grounded after passing through the resistor R12, and the B pole of the NPN transistor Q4 is connected to one end of the resistor R9; the other ends of the resistors R6 and R9 are connected and serve as the output end of the PWM signal for controlling the charging current.

[0031] The CP circuit communicates with the vehicle charger and can control the adjustment of charging power through the microcontroller.

[0032] In a possible implementation manner, the communication circuit is an RS485 communication circuit.

[0033] The main control board mainly realizes communication and control through RS485 circuit, communication module and slave. RS485 circuit has a long transmission distance, which can effectively solve the problem of unstable charging caused by attenuation of vehicle communication signal in traditional mode.

[0034] In a possible implementation manner, the main control board further includes: a dip switch and an emergency stop circuit.

[0035] The emergency stop circuit includes an emergency stop switch. When the emergency stop circuit detects that the emergency stop button is pressed, it sends an emergency stop message to the microcontroller. After receiving the emergency stop message, the microcontroller stops charging by controlling the CP circuit.

[0036] In a possible implementation manner, the flexible charging module further includes: an output board.

[0037] The output board includes: wiring terminals, power metering circuit and relay circuit.

[0038] The power metering circuit is used to measure the voltage and current of the device to be charged and measure the power when it is charging, and transmit the power data to the single chip microcomputer.

[0039] The relay circuit is used to control the on / off of the neutral wire and the live wire in the charging circuit.

[0040] In the specific implementation, the relay circuit is composed of a 40A double-controlled magnetic latching relay as the main component.

[0041] In a possible implementation manner, the main control board also includes: a CP transfer indicator light board connected to the single-chip microcomputer and the CP circuit; the CP transfer indicator light board includes: a charging status indicator light, a vehicle computer communication indicator light and a fault emergency stop light.

[0042] In a possible implementation manner, the process of generating a control instruction after the grid control receives a charging request sent by the single-chip microcomputer includes: Determine whether the transformer in the substation area has an overload warning. If so, generate a control instruction for charging according to the first set charging power; otherwise, generate a control instruction for charging according to the second set charging power; the first set charging power is less than the second set charging power.

[0043] When the transformer load in the substation is normal, it has the function of a traditional AC charging pile. Once an overload warning occurs in the transformer in the substation, the module of the present invention communicates with the electric vehicle system to reduce the charging power to ensure orderly charging of the electric vehicle.

[0044] Example 2 Embodiment 2 provided by the present invention is an embodiment of a charging pile system provided by the present invention, combined with Figure 1-Figure 10 It can be seen that the embodiment includes: the charging pile system includes: multiple charging piles and a power grid control platform installed in a set area; the charging pile includes a flexible charging module provided by an embodiment of the present invention; when the power grid control platform receives a charging request sent by one or more charging piles, it collects the current power grid load in the set area: When the current power grid meets or exceeds the first set threshold, a control instruction to start charging at a set time in the future is generated and sent to each charging pile.

[0045] When the current power grid meets the condition that the current power grid is less than the first set threshold and greater than or equal to the second set threshold, a control instruction for charging according to the first set charging power is generated, and each control instruction is issued in sequence according to the time when the charging request message is received and the charging completion time.

[0046] When the current power grid meets the condition that is less than the second set threshold, a control instruction is generated to charge according to the second set charging power; the first set threshold is greater than the second set threshold, and the first set charging power is less than the second set charging power.

[0047] It can be understood that the charging pile system provided by the present invention corresponds to the flexible charging module provided by the aforementioned embodiments. The relevant technical features of the charging pile system can refer to the relevant technical features of the flexible charging module, which will not be repeated here.

[0048] The above-mentioned power consumption areas may be residential areas, industrial parks, office parks, etc., and individual electricity users are new energy electric vehicle users within the area.

[0049] The information cluster unit optimizes the line, which is reflected in the centralized wiring and unified position order, which is convenient for the centralized management of the wiring harness. It can be used in conjunction with or alone, and has good compatibility.

[0050] The present invention provides a flexible charging module with an output power range of 1.3 kW to 7 kW. The advantage is that once the power load of the community is too large, the module of the present invention will adjust the charging sequence or automatically reduce the output power to a minimum of 1.3 kW according to the orderly charging strategy, thus achieving orderly charging.

[0051] Improve the utilization rate of distribution network equipment: The module of the present invention can fully utilize the surplus of the valley distribution transformer to achieve peak shaving and valley filling, reduce the peak-valley difference in electricity consumption, and improve the utilization rate of distribution network equipment.

[0052] Improve communication reliability: The module of the present invention communicates through a combination of power broadband carrier and micro-power wireless communication, and the communication is stable, which can effectively solve the instability of the traditional underground garage 4G networking.

[0053] Multiple operation modes: The module of the present invention can realize flexible selection of multiple operation modes. The module can realize disconnection control for users who have installed charging piles. For new users, the module can realize flexible power regulation.

[0054] A flexible charging module and charging pile system provided by the embodiment of the present invention, intelligent management: the module of the present invention can respond to the change of power grid load in real time, automatically adjust the charging power and time, and realize precise energy management by integrating advanced algorithms and communication technologies. It can intelligently allocate and manage the charging load according to the real-time status of the power grid and user needs, and reasonably allocate the use time of the charging pile. Energy saving and emission reduction: the module of the present invention realizes the optimal allocation of electric energy resources by intelligently scheduling the use of charging piles, thereby contributing to energy saving and emission reduction. User customization: the module of the present invention allows users to set charging preferences, such as charging time and charging amount, through mobile applications or other means. The device will perform intelligent scheduling according to user needs, give priority to personalized needs, and improve user experience. High safety: the module of the present invention pays attention to safety during the design and manufacturing process, adopts high-quality materials and components, and has multiple protection mechanisms such as short circuit, overload, overvoltage, undervoltage, leakage, and lightning protection. In an emergency, the device can also cut off the power supply circuit to prevent high-temperature burnout, ensuring the safety and reliability of the charging process.

[0055] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0057] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A flexible charging module, characterized in that: include: Control board; the control board includes: CP circuit, communication circuit and single chip microcomputer; After receiving the charging request from the external device to be charged, the single chip microcomputer sends the charging request to the power grid control platform through the communication circuit, receives the control instruction returned by the power grid control platform, and outputs a control signal to the CP circuit; The CP circuit controls the output power and charging sequence of the device to be charged based on the control signal.

2. The flexible charging module according to claim 1, characterized in that: The CP circuit includes: an N-channel field effect transistor Q1, a PNP-type transistor Q2, a P-channel field effect transistor Q3, an NPN-type transistor Q4, a diode D1 and a bidirectional TVS diode D2; The anode of the diode D1 is connected to one end of the bidirectional TVS diode D2, the other end of the bidirectional TVS diode D2 is grounded, the cathode of the diode D1 is connected to the pin MCU_CP of the microcontroller outputting the control signal through the resistor R8, and the MCU_CP is also grounded through the resistor R11 and the capacitor C12 connected in parallel; The D pole of the N-channel field effect transistor Q1 is connected to the positive pole of the diode D1 through the resistor R4, the S pole of the N-channel field effect transistor Q1 is connected to the -12V voltage, the resistor R1 is connected between the S pole and the G pole of the N-channel field effect transistor Q1, and the G pole of the N-channel field effect transistor Q1 is also connected to the C pole of the PNP transistor Q2; The D pole of the P-channel field effect transistor Q3 is connected to the positive pole of the diode D1 through the resistor R7, the S pole of the P-channel field effect transistor Q3 is connected to the +12V voltage, a resistor R10 is connected between the S pole and the G pole of the P-channel field effect transistor Q3, and the G pole of the P-channel field effect transistor Q3 is also connected to the C pole of the NPN transistor Q4; The E pole of the PNP transistor Q2 is connected to the +3.3V voltage after passing through the resistor R6, and the B pole of the PNP transistor Q2 is connected to one end of the resistor R5; the E pole of the NPN transistor Q4 is grounded after passing through the resistor R12, and the B pole of the NPN transistor Q4 is connected to one end of the resistor R9; the other ends of the resistor R6 and the resistor R9 are connected and serve as the output end of the PWM signal for controlling the charging current.

3. The flexible charging module according to claim 1, characterized in that: The communication circuit is an RS485 communication circuit.

4. The flexible charging module according to claim 1, characterized in that: The main control board also includes: an emergency stop circuit; The emergency stop circuit includes an emergency stop switch. When the emergency stop circuit detects that the emergency stop button is pressed, it sends an emergency stop message to the single-chip microcomputer. After receiving the emergency stop message, the single-chip microcomputer stops charging by controlling the CP circuit.

5. The flexible charging module according to claim 1, characterized in that: The flexible charging module further includes: an output plate; The output board includes: a power metering circuit and a relay circuit; The power metering circuit is used to measure the voltage and current of the device to be charged and measure the power when charging, and transmit the power data to the single chip microcomputer; The relay circuit is used to control the on / off of the neutral line and the live line in the charging circuit.

6. The flexible charging module according to claim 1, characterized in that: The main control board also includes: a CP transfer indicator light board connected to the single-chip computer and the CP circuit; the CP transfer indicator light board includes: a charging status indicator light, a vehicle computer communication indicator light and a fault emergency stop light.

7. The flexible charging module according to claim 1, characterized in that: The process of generating the control instruction after the grid control receives the charging request sent by the single chip microcomputer includes: Determine whether the transformer in the substation has an overload warning, and if so, generate the control instruction for charging according to the first set charging power, otherwise generate the control instruction for charging according to the second set charging power; the first set charging power is less than the second set charging power.

8. A charging pile system, characterized in that: The charging pile system comprises: a plurality of charging piles and a power grid control platform installed in a set area; the charging piles comprise the flexible charging module according to any one of claims 1 to 7; when the power grid control platform receives a charging request sent by one or more of the charging piles, it collects the current power grid load in the set area: When the current power grid meets or exceeds a first set threshold, generating the control instruction for starting charging at a future set time to each of the charging piles; When the current power grid meets the condition that the current power grid is less than the first set threshold and greater than or equal to the second set threshold, the control instruction for charging according to the first set charging power is generated, and each control instruction is issued in sequence according to the time when the charging request message is received and the charging completion time; When the current power grid meets the requirement of being less than a second set threshold, the control instruction for charging according to the second set charging power is generated; the first set threshold is greater than the second set threshold, and the first set charging power is less than the second set charging power.

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