Energy interaction method and device of energy storage charging pile and energy storage charging pile

Abstract

The invention relates to the technical field of charging piles, in particular to an energy interaction method and device of an energy storage charging pile and the energy storage charging pile. The method comprises the steps that when it is determined that the current moment is in a maintenance time period corresponding to an energy storage charging pile and whether the residual electric quantity of the energy storage charging pile is smaller than a battery discharge depth DOD upper limit value or not, charging energy storage is carried out on the energy storage charging pile from a mains supply power grid through a charging interface, or interaction with a regional micro-grid is carried out through the charging interface; charging and energy storage are carried out on the energy storage charging pile; wherein the maintenance time period corresponds to the valley time period of the commercial power grid.

Description

Technical Field

[0001] The present application relates to the technical field of charging piles, and particularly to an energy interaction method, device and energy storage charging pile for an energy storage charging pile. Background Art

[0002] Currently, the charging piles on the market are mainly divided into direct current fast charging piles (corresponding to the GB / T 20234.3 direct current charging standard) and alternating current slow charging piles (including 220V single-phase for household / 380V three-phase for commercial use, corresponding to the GB / T 20234.2 alternating current charging standard), which respectively meet the requirements of fast energy replenishment and conventional slow charging, and are widely used in public charging stations, households and commercial places.

[0003] The principle of the fast charging pile is as follows: Through the direct current charging method with high voltage and large current, it directly bypasses the on-vehicle charger of the electric vehicle, and uses the power conversion devices such as rectification and inversion inside the charging pile to convert the alternating current of the power grid into direct current suitable for the battery, and quickly injects electric energy into the battery to shorten the charging time.

[0004] The principle of the slow charging pile is as follows: It adopts the alternating current charging mode with low current, connects to the household 220V or low-voltage 380V power supply, inputs the alternating current into the electric vehicle, and through the on-vehicle charger, processes the current such as conversion and voltage stabilization, and then slowly charges the battery. The charging process is more gentle and has less battery loss.

[0005] However, the construction and operation costs of fast charging piles are high. Although the costs of slow charging piles are low, it takes several hours to fully charge a depleted battery pack, which is difficult to meet if the vehicle has an emergency operation requirement, and also limits the cruising range of electric vehicles to a certain extent, reducing the usage efficiency. Therefore, there is an urgent need for improvement. Summary of the Invention

[0006] Based on this, in view of the above technical problems, it is necessary to provide an energy interaction method, device and energy storage charging pile for an energy storage charging pile that can improve the multi-source cooperation ability.

[0007] In a first aspect, the present application provides an energy interaction method for an energy storage charging pile, which is applied to an energy storage charging pile. The energy storage charging pile is provided with a charging interface, and the charging interface is connected to the output end of the commercial power grid and the output end of the regional microgrid. The energy storage charging pile is also provided with a discharging interface, and the discharging interface is used to connect the device to be charged; the method includes: When it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile, and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, then charge and store energy for the energy storage charging pile from the commercial power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Among them, the maintenance period corresponds to the low valley period of the mains power grid.

[0008] In one embodiment, the method further includes: If the remaining power of the energy storage charging pile is greater than or equal to the DOD upper limit value, enter the online standby mode, and the online standby mode can discharge the device to be charged; and / or, If the current moment is in the standby period, enter the online standby mode; the standby period corresponds to the non-low valley period of the mains power grid.

[0009] In one embodiment, the energy storage charging pile is charged and stored through the charging interface from the mains power grid, or interacts with the regional microgrid through the charging interface to charge and store the energy storage charging pile, including: If it is determined that there is remaining energy in the regional microgrid, interact with the regional microgrid through the charging interface to charge and store the energy storage charging pile; If it is determined that there is no remaining energy in the regional microgrid, charge and store the energy storage charging pile from the mains power grid through the charging interface.

[0010] In one embodiment, interacting with the regional microgrid through the charging interface to charge and store the energy storage charging pile includes: If there is remaining energy in the photovoltaic power generation module in the regional microgrid, convert the DC power of the photovoltaic through the AD-DC module into the voltage level required by the energy storage charging pile, and charge and store the energy storage charging pile through the charging interface; If there is remaining energy in the building load in the regional microgrid, absorb alternating current from the building mains power grid, convert it into direct current through the AD-DC module and store it to charge and store the energy storage charging pile.

[0011] In one embodiment, the method further includes: When receiving a charging request initiated by the device to be charged, determine whether the energy storage charging pile is currently in the charging and replenishing state; If the energy storage charging pile is currently in the charging and replenishing state, stop charging; If it is in the non-charging and replenishing state, determine whether to charge the device to be charged according to the connection state between the device to be charged and the energy storage charging pile.

[0012] In one embodiment, determining whether to charge the device to be charged according to the connection state between the device to be charged and the energy storage charging pile includes: If it is determined that the connection state between the device to be charged and the energy storage charging pile is already connected to the energy storage charging pile, charge the device to be charged until the charging termination condition is reached; Among them, the charging termination condition includes at least one of the following: The device to be charged reaches the power threshold; Receive the stop charging execution initiated by the device to be charged; The remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery.

[0013] In one embodiment, if it is determined that the connection status between the device to be charged and the energy storage charging pile is connected to the energy storage charging pile, then charge the device to be charged, including: If it is determined that the connection status between the device to be charged and the energy storage charging pile is connected to the energy storage charging pile, and the device to be charged has completed the online prepayment operation, then charge the device to be charged.

[0014] In a second aspect, the present application also provides an energy interaction device for an energy storage charging pile, configured in the energy storage charging pile. For the energy storage charging pile, the energy storage charging pile is provided with a charging interface, the charging interface is connected to the output end of the mains power grid and the output end of the regional microgrid, the energy storage charging pile is also provided with a discharging interface, and the discharging interface is used to connect the device to be charged. The device includes: An energy replenishment module, configured to, when it is determined that the current moment is in the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Wherein, the maintenance period corresponds to the low valley period of the mains power grid.

[0015] In a third aspect, the present application also provides an energy storage charging pile, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the following steps are implemented: When it is determined that the current moment is in the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Wherein, the maintenance period corresponds to the low valley period of the mains power grid.

[0016] In a fourth aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: When it is determined that the current moment is in the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Among them, the maintenance period corresponds to the low valley period of the mains power grid.

[0017] In a fifth aspect, the present application further provides a computer program product, including a computer program, which when executed by a processor, implements the following steps: When it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile, and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, then charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Among them, the maintenance period corresponds to the low valley period of the mains power grid.

[0018] For the above energy interaction method, device and energy storage charging pile of the energy storage charging pile, the energy storage charging pile of the present application can store electric energy during the low valley period of power demand and release electric energy during the peak period, balance the grid load, and reduce the demand for instantaneous high power of the conventional grid; it can also provide fast charging services for electric vehicles and has relatively little impact on the battery; in addition, by reasonably using the peak-valley electricity price difference, the user's electricity cost and the enterprise's operation cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for the description of the embodiments of the present application or related technologies. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of an energy storage charging pile in an embodiment; Figure 2 It is a schematic flowchart of an energy interaction method of an energy storage charging pile in an embodiment; Figure 3 It is a schematic flowchart of the steps of charging a device to be charged in an embodiment; Figure 4 It is a structural block diagram of an energy interaction device of an energy storage charging pile in an embodiment; Figure 5 It is a structural block diagram of an energy interaction device of an energy storage charging pile in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the purpose, technical solutions and advantages of the present application clearer, the following will further describe the present application in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0022] In an exemplary embodiment, an energy storage charging pile is provided, and the structure of the energy storage charging pile is as Figure 1 shown, including the following systems: Cloud - EMS (Energy Management System) detection system, configured with the following modules: 11. Peak - valley period information setting module: Used to obtain and set the peak - valley period information of the mains power grid, providing a time - period basis for the energy interaction strategy of the energy storage charging pile.

[0023] 12. Battery health status detection system: Real - time monitors the health status of the battery in the energy storage charging pile, such as key parameters like battery capacity, charge - discharge performance, etc.

[0024] 13. Meteorological data detection system: Collects external meteorological data (such as temperature, humidity, etc.), providing environmental information for the thermal management strategy of the energy storage charging pile.

[0025] 14. Site micro - environment monitoring system: Real - time monitors the micro - environment of the site where the energy storage charging pile is located (such as in - station temperature, humidity, ventilation conditions, etc.), ensuring the safety of the equipment operation environment.

[0026] 2. Cloud EMS strategy model system, configured with the following modules: 21. Timed energy replenishment strategy model: Based on the peak - valley period information, formulates the timed energy replenishment strategy for the energy storage charging pile during the low - valley period, optimizing the charging cost.

[0027] 22. Dynamic DOD model: Combines the battery health status to construct a dynamic depth of discharge (DOD) strategy model, setting a reasonable upper limit for the battery depth of discharge to protect the battery life.

[0028] 23. Dynamic thermal management strategy model: Generates a dynamic thermal management strategy based on the meteorological data and the results of the site micro - environment monitoring, ensuring the temperature stability of the energy storage charging pile in different environments.

[0029] 3. Local EMS system, configured with the following modules: 31. Strategy setting module: Receives the instructions of the cloud EMS strategy model system, completes the local timed energy replenishment strategy setting, DOD strategy setting, and liquid - cooling strategy setting, realizing the local execution of the strategy.

[0030] 32. Local status detection module: Real - time detects the local operation status of the energy storage charging pile, such as the power, equipment operation parameters, etc., providing real - time data support for strategy adjustment.

[0031] 4. Energy storage charging pile entity components, configured with the following components: 41. Energy storage battery pack PACK: As the core of energy storage, it realizes the storage and release of electrical energy.

[0032] 42. High-voltage pack: Responsible for the power transmission and management of high-voltage circuits, ensuring the stable operation of the high-voltage part of the energy storage system.

[0033] 43. Liquid cooling unit: Based on the thermal management strategy, it dissipates heat or controls the temperature of the energy storage charging pile to ensure that the equipment operates at an appropriate temperature.

[0034] 44. BMS (Battery Management System) system: Monitors the battery status in real time, manages the battery charging and discharging process, and ensures the safety and performance of the battery.

[0035] 45. PCS system (Power Conversion System): Realizes the conversion of AC and DC electrical energy, and coordinates the energy interaction between the energy storage charging pile, the power grid, and the device to be charged.

[0036] 46. EMS system (Energy Management System): Overall management of the energy flow of the energy storage charging pile, and executes the policy instructions of the cloud EMS and the local EMS.

[0037] 47. Input / output interface: Includes DC / AC input ports (connected to the mains power grid and regional microgrids), as well as DC output ports and external charging guns, realizing the input of electrical energy and the charging output to external devices.

[0038] This energy storage charging pile realizes the use of mains power for energy storage charging and fast charging and discharging, relying on the following systems and modules to work together: First, the implementation module for using mains power for energy storage charging includes: Cloud EMS detection system: Peak-valley period information setting: Obtains the peak-valley periods of the mains power grid, provides a time basis for charging during the low valley period, and reduces the charging cost.

[0039] Cloud EMS strategy model system: Timed energy replenishment strategy model: Based on the peak-valley periods, formulates an energy storage charging strategy during the low valley period to optimize the timing of energy acquisition.

[0040] Local EMS system: Timed energy replenishment strategy setting: Receives and executes the charging strategy of the cloud EMS, and drives the charging operation.

[0041] Core functional components: PCS system (Power Conversion System): Converts the alternating current input from the mains power grid into direct current suitable for storage in the energy storage battery pack. Energy storage battery pack PACK: Serves as the energy storage carrier, receiving and storing the converted electrical energy. EMS system (Energy Management System): Overall management of the flow of electrical energy input from the mains power supply, coordinating the charging process. DC / AC input port: Physically connects to the mains power grid to achieve electrical energy input.

[0042] Secondly, as the implementation module for discharging of the fast charging pile, it includes: Energy release carrier and management: Energy storage battery pack PACK: Releases the stored electrical energy to provide the energy source for fast charging. BMS system (Battery Management System): Monitors the battery voltage, temperature, remaining power and other states during the discharging process to ensure the safety of discharging and avoid over-discharge.

[0043] Power conversion and output: PCS system (Power Conversion System): Converts the direct current of the battery pack into the electrical energy form suitable for the device to be charged (such as an electric vehicle).

[0044] DC output port + external charging gun: Physically connects to the device to be charged to achieve electrical energy output.

[0045] Status monitoring: Local status detection module of the local EMS system: Real-time monitors the device operation parameters (such as current, voltage) during the discharging process to ensure stable discharging.

[0046] As Figure 2 shown, an energy interaction method for an energy storage charging pile is provided, which is applied to the Figure 1 energy storage charging pile in it. The energy storage charging pile is provided with a charging interface, and the charging interface is connected to the output end of the mains power grid and the output end of the regional microgrid. The energy storage charging pile is also provided with a discharging interface, and the discharging interface is used to connect to the device to be charged; the method includes: S201, when it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the battery depth of discharge DOD, then charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile.

[0047] Among them, the maintenance period corresponds to the low valley period of the mains power grid.

[0048] It can be understood that the energy storage charging pile is provided with a charging interface and a discharging interface. The charging interface is connected to the output end of the mains power grid and the output end of the regional microgrid, and is used to obtain electrical energy from the mains power grid or the regional microgrid to charge the energy storage system of the energy storage charging pile. The discharging interface is used to connect to the device to be charged, such as an electric vehicle, etc., and output the electrical energy stored in the energy storage charging pile to the device to be charged.

[0049] Among them, the maintenance period of the energy storage charging pile corresponds to the low valley period of the mains power grid. The low valley period is usually the period when the grid load is low and the electricity price is low, such as at night or during a specific low electricity consumption period. The specific time of the maintenance period can be set according to the electricity price policy and load curve of the grid operator.

[0050] Optionally, the energy storage charging pile is internally equipped with a power monitoring system to monitor the remaining power of the energy storage system in real time. When the remaining power is less than the upper limit value of the depth of discharge (DOD) of the battery, the charging operation is triggered. The upper limit value of DOD refers to the maximum depth of discharge that the battery is allowed to reach during discharge, and is usually used to protect the battery life.

[0051] During the maintenance period, if the remaining power of the energy storage charging pile is less than the upper limit value of DOD, it is preferred to charge from the mains power grid. Through the charging interface, the electric energy of the mains power grid is input into the energy storage system of the energy storage charging pile to complete the charging process.

[0052] If the power supply of the mains power grid is insufficient, or there are more favorable energy interaction conditions between the energy storage charging pile and the regional microgrid (such as the regional microgrid has surplus electric energy and lower cost), then interact with the regional microgrid through the charging interface to obtain electric energy from the regional microgrid for charging.

[0053] The energy management system of the energy storage charging pile will automatically select the optimal charging power source according to the real-time monitored grid status (such as the voltage, current, electricity price, etc. of the mains power grid) and the operating status of the regional microgrid (such as the power generation of distributed energy, the remaining power of energy storage devices, etc.).

[0054] During the charging process, the energy management system will dynamically adjust the charging power according to the remaining power of the energy storage charging pile and the charging demand to ensure the efficiency and safety of the charging process.

[0055] In this embodiment, by charging during the low valley period of the mains power grid, the energy storage charging pile can absorb electric energy when the grid load is low and release electric energy during the peak period, playing a role in peak shaving and valley filling, optimizing the load curve of the grid, and improving the stability and reliability of the grid operation. Avoiding a large amount of charging during the peak electricity consumption period can reduce the power supply pressure on the grid and reduce grid losses. Charging during the low valley period of the mains power grid can enjoy a lower electricity price, thereby reducing the charging cost of the energy storage charging pile. Interacting with the regional microgrid can make full use of the surplus electric energy generated by distributed energy (such as solar energy, wind energy, etc.), further reducing the charging cost.

[0056] The energy management system of the energy storage charging pile can monitor the grid status and the energy storage system status in real time, dynamically adjust the charging strategy, and ensure the efficient utilization of electric energy. Through the two-way interaction with the mains power grid and the regional microgrid, the energy storage charging pile can flexibly respond to different energy supply situations, improving the flexibility and adaptability of the entire energy system. By setting the upper limit value of DOD, over-discharge of the battery is avoided, thus prolonging the service life of the battery.

[0057] In one embodiment, the method further includes: if the remaining power of the energy storage charging pile is greater than or equal to the upper limit value of DOD, enter the online standby mode, and the online standby mode can discharge the device to be charged, and / or, if the current time is in the standby period, enter the online standby mode. The standby period corresponds to the non-low valley period of the mains power grid.

[0058] It can be understood that the power monitoring system inside the energy storage charging pile is the basis of the whole process. It measures the remaining power of the energy storage system (such as the battery pack) in real time through a series of sensors and circuits. These sensors can detect parameters such as the voltage, current, and temperature of the battery, and then use the characteristic curve of the battery (usually provided by the battery manufacturer) and relevant algorithms to calculate the current remaining power.

[0059] When the remaining power is greater than or equal to the upper limit value of the depth of discharge (DOD) of the battery, the energy storage charging pile enters the online standby mode. The upper limit value of DOD is a preset parameter, which represents the maximum depth of discharge that the battery is allowed to reach during discharge. For example, if the upper limit value of DOD is set to 80%, then when the remaining power of the battery reaches 20% (100% - 80%), it is considered that the battery is "fully charged" (from the perspective of discharge), and at this time, the energy storage charging pile enters the online standby mode. The purpose of this power judgment principle is to ensure that the battery will not be over-discharged, thus prolonging the service life of the battery. At the same time, when the battery power is sufficient, the energy storage charging pile can provide electric energy for the device to be charged at any time, improving the availability and flexibility of the system.

[0060] It can be understood that the setting of the standby period is based on the electricity price policy and load curve of the mains power grid. The mains power grid usually has different electricity price periods, including low valley periods, flat periods, and peak periods. The low valley period is the period when the grid load is low and the electricity price is low, while the peak period is the period when the grid load is high and the electricity price is high. The standby period corresponds to the non-low valley period of the mains power grid, mainly the peak period and the flat period. During these periods, the grid load is large and the electricity price is relatively high. The energy storage charging pile enters the online standby mode during these periods, ready to discharge the device to be charged, rather than performing the charging operation.

[0061] The principle of doing this is as follows: Charging during peak hours will increase the burden on the power grid, and at the same time, the electricity price is relatively high, increasing the charging cost. By entering the standby mode during non-low valley hours, the energy storage charging pile can avoid charging during these hours. During the low valley hours, the energy storage charging pile can use the lower electricity price to charge and store electrical energy. Then, it discharges during peak hours, which can achieve peak shaving and valley filling, optimize the power grid load, and reduce the charging cost at the same time.

[0062] Furthermore, the online standby mode is a special operating state, and its core principle is to keep the energy storage charging pile in a "ready-to-use" state. In this mode, the discharge interface of the energy storage charging pile is in the standby state, which means that the discharge interface is already ready and can connect to the device to be charged at any time and provide electrical energy for it.

[0063] Specifically, the energy management system of the energy storage charging pile continuously monitors the state of the discharge interface and the requirements of the device to be charged. Once a device is connected to the discharge interface and a charging request is issued, the energy storage charging pile will immediately respond and output electrical energy from the energy storage system to charge the device to be charged. The key principle of this mode is that the energy storage charging pile can quickly respond to the charging request of the device to be charged in the online standby mode, reduce the waiting time of users, and improve the user experience. In the standby mode, the energy storage charging pile does not perform charging operations but focuses on the discharge function. This can avoid unnecessary charging during high electricity price or high power grid load periods, further optimizing the operating efficiency and economy of the system.

[0064] Specifically, the energy storage charging pile is charged and stored through the charging interface from the mains power grid, or interacts with the regional microgrid through the charging interface to charge and store the energy storage charging pile, including: Case 1: If it is determined that there is surplus energy in the regional microgrid, then interact with the regional microgrid through the charging interface to charge and store the energy storage charging pile.

[0065] It can be understood that the energy management system of the energy storage charging pile monitors the operating state of the regional microgrid in real time, including the power generation of distributed energy sources (such as solar energy, wind energy, etc.) and the remaining power of energy storage devices. If it is determined that there is surplus energy in the regional microgrid (that is, the power generation of distributed energy sources is greater than the electricity demand within the regional microgrid), then interact with the regional microgrid through the charging interface and obtain electrical energy from the regional microgrid for charging. In this case, giving priority to using the surplus energy of the regional microgrid for charging can reduce the dependence on the mains power grid and lower the charging cost.

[0066] Case 2: If it is determined that there is no surplus energy in the regional microgrid, then charge and store the energy storage charging pile from the mains power grid through the charging interface.

[0067] It is understandable that if the energy management system detects that there is no remaining energy in the regional microgrid (i.e., the distributed energy generation is not sufficient to meet the electricity demand within the regional microgrid), it will switch to the mains power grid for charging. Electrical energy is obtained from the mains power grid through the charging interface to charge the energy storage system of the energy storage charging pile. In this case, the mains power grid serves as a backup charging source to ensure that the energy storage charging pile can be charged in a timely manner.

[0068] In this embodiment, charging during the low-load period of the mains power grid can enjoy a lower electricity price, thereby reducing the charging cost of the energy storage charging pile. Prioritizing the use of the remaining energy of the regional microgrid for charging can further reduce the charging cost and improve the utilization rate of distributed energy at the same time.

[0069] In an exemplary embodiment, interacting with the regional microgrid through the charging interface to charge and store energy in the energy storage charging pile includes: Case 1: If there is remaining energy in the photovoltaic power generation module in the regional microgrid, the AD-DC module converts the direct current of the photovoltaic into the voltage level required by the energy storage charging pile, and charges and stores energy in the energy storage charging pile through the charging interface.

[0070] It is understandable that the photovoltaic power generation module is an important part of the regional microgrid. It converts solar energy into direct current (DC) through solar panels. During normal operation, the electrical energy generated by the photovoltaic power generation module is mainly used to meet the load demand within the regional microgrid, such as the electricity consumption of lighting, electrical appliances and other equipment in the building. The energy management system of the energy storage charging pile will monitor the status of the regional microgrid in real time, including the power generation of the photovoltaic power generation module and the load demand within the regional microgrid. If the electrical energy generated by the photovoltaic power generation module exceeds the load demand within the regional microgrid, there will be remaining energy. For example, on sunny days with low load demand, the photovoltaic power generation module may generate more remaining electrical energy.

[0071] The AD-DC module is a power conversion device used to convert alternating current (AC) into direct current (DC). In this embodiment, the function of the AD-DC module is to convert the direct current generated by the photovoltaic power generation module into the voltage level required by the energy storage charging pile. This is because the direct current voltage generated by the photovoltaic power generation module may not match the voltage required by the energy storage charging pile, and voltage conversion is required through the AD-DC module.

[0072] When it is detected that there is remaining energy in the photovoltaic power generation module, the AD-DC module converts the direct current of the photovoltaic into the voltage level required by the energy storage charging pile. The converted direct current is transmitted to the energy storage system of the energy storage charging pile through the charging interface to complete the charging process. This charging method directly utilizes the remaining energy of the photovoltaic power generation module, reduces the dependence on the mains power grid, and also reduces the charging cost.

[0073] Case 2: If there is surplus energy in the building load of the regional microgrid, alternating current is absorbed from the building's mains power grid, converted into direct current by the AD-DC module, and then stored to charge the energy storage charging pile for energy storage.

[0074] It can be understood that the building load refers to the sum of various electrical equipment, lighting, etc. inside the building. In some cases, the electricity demand of the building load may be lower than the power supply capacity of the mains power grid, resulting in surplus energy. For example, at night or during low-load periods, there are fewer electrical devices inside the building, and the power supply capacity of the mains power grid may exceed the actual demand. The energy management system of the energy storage charging pile will also monitor the electricity consumption of the building load and the power supply of the mains power grid in real time. If the electricity demand of the building load is lower than the power supply capacity of the mains power grid, surplus energy will occur.

[0075] In this case, the role of the AD-DC module is to convert the alternating current of the building's mains power grid into direct current. Because the energy storage system of the energy storage charging pile usually requires direct current for charging, and the electrical energy provided by the mains power grid is alternating current, conversion is required through the AD-DC module.

[0076] When it is detected that there is surplus energy in the building load, alternating current is absorbed from the building's mains power grid. After converting the alternating current into direct current through the AD-DC module, the converted direct current is stored in the energy storage system of the energy storage charging pile to complete the charging process. This method utilizes the surplus energy of the building load and further optimizes the energy utilization efficiency.

[0077] In this embodiment, the electrical energy from different sources (the direct current of the photovoltaic power generation module or the alternating current of the building's mains power grid) is converted into the direct current required by the energy storage charging pile through the AD-DC module, and the converted direct current is transmitted to the energy storage system of the energy storage charging pile through the charging interface to complete the charging process. By utilizing the surplus energy of the photovoltaic power generation module and the building load, the dependence on the mains power grid is reduced, the charging cost is lowered, and at the same time, the energy utilization efficiency is improved, realizing the optimal energy scheduling within the regional microgrid.

[0078] In one of the embodiments, as Figure 3 shown, the method further includes the following steps: S301, when receiving a charging request initiated by the device to be charged, determine whether the energy storage charging pile is currently in a charging and energy replenishing state.

[0079] It is understandable that when a charging device (such as an electric car) initiates a charging request, the energy storage charging pile first needs to determine whether it is currently in a charging and replenishing state. The "charging and replenishing state" here means that the energy storage charging pile itself is obtaining power from an external power source (such as a municipal power grid or a regional microgrid) to replenish the power of its energy storage system.

[0080] The energy management system (EMS) of the energy storage charging pile monitors the operating status of the charging pile in real time, including the power level of the energy storage system and whether charging and replenishment operations are in progress. EMS determines whether the energy storage charging pile is obtaining power from an external power source by detecting parameters such as the current and voltage of the charging interface. If current is detected flowing into the energy storage system and the charging interface is in working condition, the charging pile is considered to be in a charging and replenishment state; conversely, if the charging interface does not detect current inflow or is in an idle state, the charging pile is considered to be in a non-charging and replenishment state.

[0081] S302: If the energy storage charging pile is currently in a charging and replenishing state, charging is stopped.

[0082] It is understandable that if the energy storage charging pile is currently in a charging and replenishing state, then when a new charging request is received, the ongoing charging and replenishing operation needs to be stopped first. The principle of this step is based on priority and resource allocation considerations.

[0083] When the charging pile is charging its own energy storage system, the energy in its energy storage system is being replenished. If the device to be charged is charged at this time, the energy storage system may be insufficient and unable to meet the needs of both its own energy replenishment and external charging. Therefore, in order to ensure that there is enough power to serve the device to be charged, the charging pile needs to stop the current charging and energy replenishment operation first, release the energy in the energy storage system, and redistribute it to the device to be charged.

[0084] S303: If the device is in a non-charging and energy replenishing state, determine whether to charge the device according to the connection state between the device to be charged and the energy storage charging pile.

[0085] It is understandable that if the energy storage charging pile is currently in a non-charging state, it is necessary to further determine the connection status between the device to be charged and the charging pile to determine whether to charge the device. The principle of this step is based on safety and reliability considerations.

[0086] The charging pile needs to ensure that the device to be charged is correctly connected to the charging interface before starting the charging operation. This is because if the device is not correctly connected, dangerous situations such as electric energy leakage and short - circuit may occur during the charging process, which will not only damage the device but also may cause safety accidents. Therefore, the charging pile determines whether the device to be charged is connected to the charging pile by detecting the physical connection status of the charging interface (such as whether the plug is inserted and the connection is firm) and the communication status (such as whether the device has sent the correct connection signal).

[0087] Optionally, determining whether to charge the device to be charged according to the connection status between the device to be charged and the energy - storage charging pile includes: If it is determined that the connection status between the device to be charged and the energy - storage charging pile is connected to the energy - storage charging pile, then charge the device to be charged until the charging termination condition is reached.

[0088] Among them, the charging termination condition includes at least one of the following: (1) The device to be charged reaches the battery charge threshold.

[0089] (2) Receive the stop - charging execution initiated by the device to be charged.

[0090] (3) The remaining power of the energy - storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery.

[0091] It can be understood that for condition (1), each device to be charged (such as an electric vehicle) has its own battery management system (BMS) for monitoring the battery charge status. When the battery charge of the device reaches the preset threshold (such as 80% or 100%), the BMS sends a signal to the charging pile to inform it that the battery is full. After receiving this signal, the charging pile stops the charging operation to avoid over - charging and protect the battery life.

[0092] It can be understood that for condition (2), during the charging process, the user of the device to be charged may need to stop charging in advance, for example, because the user needs to use the vehicle or there are other emergencies. Therefore, the device sends a stop - charging instruction to the charging pile through its communication system. After receiving this instruction, the charging pile immediately stops the charging operation to respond to the user's demand.

[0093] It can be understood that for condition (3), when the energy - storage charging pile has insufficient power, it is necessary to give priority to protecting its own battery and avoid over - discharge. When the energy - storage charging pile needs to charge multiple devices, through the control of the DOD upper limit value, the power is reasonably allocated to ensure that each device can obtain sufficient electric energy.

[0094] Optionally, if it is determined that the connection status between the device to be charged and the energy - storage charging pile is connected to the energy - storage charging pile, then charging the device to be charged includes: If it is determined that the connection status between the device to be charged and the energy storage charging pile is that it has been connected to the energy storage charging pile, and the device to be charged has completed the online prepayment operation, then the device to be charged is charged.

[0095] It can be understood that before starting to charge, the energy storage charging pile first needs to confirm whether the device to be charged is correctly connected to the charging interface. This step is the basis of the charging process, ensuring the safety and reliability of the charging operation.

[0096] The energy storage charging pile determines whether the device to be charged is connected by detecting the physical connection status of the charging interface. This usually includes the following: Plug insertion detection: Detect whether the charging plug is correctly inserted into the charging interface through mechanical or electronic sensors. Electrical connection detection: Confirm whether the electrical connection is normal by detecting parameters such as voltage and current of the charging interface. In addition to the physical connection, the energy storage charging pile also needs to confirm whether the communication with the device to be charged is normal. This is usually achieved in the following ways: Handshake signal: After connecting, the device to be charged sends a handshake signal to the energy storage charging pile, indicating that it is ready to charge. Communication protocol: The energy storage charging pile and the device to be charged follow a specific communication protocol (such as CCS, CHAdeMO, etc.), and the connection status is confirmed through protocol interaction.

[0097] On the basis of confirming that the device to be charged is connected, the energy storage charging pile also needs to verify whether the device to be charged has completed the online prepayment operation. This verification process is an important part of the charging process, ensuring the commercial feasibility of the charging service.

[0098] 1. Definition of prepayment operation The online prepayment operation refers to that the user pays the charging fee in advance through an electronic payment method (such as mobile payment, bank card payment, electronic wallet, etc.). This payment method is usually completed through the payment system built in the charging pile or a third-party payment platform connected to the charging pile.

[0099] 2. Detection of payment status The energy management system (EMS) or payment system of the energy storage charging pile will monitor the payment status of the device to be charged in real time. After the user completes the online prepayment operation, the payment system will generate a payment success signal or voucher and send it to the control system of the charging pile.

[0100] The charging pile determines whether the user has completed the prepayment operation by detecting whether the payment system has received a payment success signal. This process usually involves encrypted communication and authentication to ensure the security and accuracy of payment information. If the payment system confirms that the user has completed the online prepayment operation, the control system of the charging pile will authorize the start of charging. If the payment success signal is not detected, the charging pile will reject the charging request and prompt the user to complete the payment. This mechanism ensures that the fees for charging services can be collected in a timely manner, improving the commercial feasibility of charging pile operation. At the same time, the security of the system is increased through payment verification, preventing unauthorized use.

[0101] After confirming that the device to be charged is connected and the online prepayment operation has been completed, the energy storage charging pile starts charging the device. The principle of this process is the same as that of a general charging process, that is, electrical energy is transmitted from the energy storage system to the device to be charged through the charging interface until the charging termination condition is reached.

[0102] In this embodiment, the principle of the above embodiment is to achieve the response to charging requests, the detection of connection status, and the verification of payment status through the collaborative work of the energy management system and the payment system of the energy storage charging pile. This mechanism not only ensures the safety and reliability of charging operations, but also increases the commercial feasibility and security of the system through payment verification.

[0103] Based on the above energy interaction method of the energy storage charging pile, as Figure 4 shown, an exemplary process of the energy interaction method of the energy storage charging pile is provided, involving multiple links such as users, cloud platforms, devices, and order management. The following is a detailed explanation of this process: 1. System initialization Cloud EMS + control system: including cloud EMS + policy model and cloud EMS + policy model system.

[0104] Local EMS system: including local EMS system, local EMS policy model, and local EMS policy model system.

[0105] Devices and interfaces: including energy storage batteries, energy storage battery BMS / PACK, energy storage battery EMS, energy storage battery PCS, DC input port of energy storage battery, DC output port + outdoor charging gun.

[0106] 2. User operation: The user issues an instruction through the mini-program / APP.

[0107] 3. Order management: Managed through the cloud platform, site management system, device management system, and order management system.

[0108] 4. Order processing flow Order reception: The system receives an order request.

[0109] Order status check: Check whether the order is being recharged.

[0110] If so, interrupt the recharge.

[0111] If not, proceed to the next step.

[0112] Smart charging pile: Check whether the smart charging pile is normal.

[0113] If normal, proceed to the next step.

[0114] If not normal, prompt the user and end the process.

[0115] Real-time power detection: Check whether the real-time power is normal.

[0116] If normal, proceed to the next step.

[0117] If not normal, prompt the user and end the process.

[0118] Device status check: Check whether the device status is normal.

[0119] If normal, proceed to the next step.

[0120] If not normal, prompt the user and end the process.

[0121] Order payment check: Check whether the order has been paid.

[0122] If paid, proceed to the next step.

[0123] If not paid, prompt the user and end the process.

[0124] Device startup: Start the device and begin charging.

[0125] Order completion: After charging is completed, the order ends.

[0126] 5. Energy management, including: AD-DC module: including AD-DC module and V2G module; Energy storage control: intelligently control the energy storage system to ensure the effective utilization of energy.

[0127] 6. Order completion: After the order is completed, the system updates the order status and sends a notification to the user.

[0128] 7. User feedback: Users can view the order status and give feedback through the mini-program / APP.

[0129] 8. System monitoring: The system continuously monitors the device status and order execution to ensure the stable operation of the system.

[0130] Through the above steps, the entire energy management system realizes the full-process management from user order placement to order completion, ensuring the efficient utilization of energy and the convenient experience of users.

[0131] In addition, when the mains power grid faces the large-scale access of electric vehicles, problems such as load fluctuations and voltage instability are likely to occur. Especially during the peak charging period, the mains power grid may face the risk of overload. In traditional technologies, the interactive micro-mains power grid of vehicle-to-grid (V2G) and smart charging piles are coordinated and optimized. By deeply integrating electric vehicles (EVs) with the micro-mains power grid (Microgrid) and smart charging stations (Smart Charging Station), two-way energy flow and coordinated optimization among electric vehicles, charging piles, and the mains power grid are achieved. However, in traditional V2G technologies, the coordinated optimization among electric vehicles, charging piles, and the mains power grid often lacks a systematic solution, resulting in low resource utilization efficiency.

[0132] Furthermore, this embodiment provides a coordinated optimization system for an interactive micro-mains power grid based on V2G and smart charging piles. The system includes an incentive module, a time period matching module, and a power quantity and location coordination module; where: This application provides a coordinated optimization system for an interactive microgrid based on V2G and smart charging piles. The system includes an incentive module, a time period matching module, and a power quantity and location coordination module; The incentive module constructs an integral reward system through a blockchain smart contract, which is used to record the data of vehicle reverse charging contributions and perform rights and interests redemption operations; The time period matching module is data-connected to the incentive module. By deploying a two-way time period matching algorithm, it matches the vehicle reverse charging contribution data recorded by the incentive module with the grid demand time period to generate a vehicle's available reverse charging time period plan; The power quantity and location coordination module interacts with the time period matching module, which is used to predict the remaining power of the vehicle, and according to the predicted remaining power of the vehicle and the available reverse charging time period plan, guide the vehicle to an appropriate charging pile for charging operations.

[0133] In an exemplary embodiment, in the time period matching module, the bilateral matching algorithm performs quantitative matching through the user time period preference weight matrix and the grid demand urgency weight matrix to generate a vehicle's available reverse charging time period plan; Among them, the user time period preference weight matrix reflects the willingness of vehicle users to perform reverse charging during a specific time period; the grid demand urgency weight matrix reflects the demand intensity of the grid for reverse charging during a specific time period.

[0134] In an exemplary embodiment, the user time - period preference weight matrix is generated based on the user's historical charging behavior, a preset charging plan, or user - input data, and is used to quantify the charging preferences of vehicle users in each time period.

[0135] In an exemplary embodiment, the grid demand urgency weight matrix is generated through grid load forecasting, real - time load data, or grid operation requirements, and is used to quantify the demand intensity of the grid for reverse charging in each time period.

[0136] In an exemplary embodiment, the power - quantity and location coordination module includes an LSTM remaining power prediction model; The LSTM remaining power prediction model uses the vehicle's historical driving mileage, real - time positioning coordinates, and the user - preset driving plan mileage as input data to predict the remaining power of the vehicle; wherein, the remaining power is not less than the dynamic remaining power threshold required for the vehicle driving plan.

[0137] In an exemplary embodiment, the power - quantity and location coordination module includes a power prediction module, and the power prediction module is used for: Calculate the remaining driving mileage according to the user - preset driving plan mileage and the vehicle's current location; Calculate the power required to complete the driving plan according to the vehicle's average energy consumption rate and the remaining driving mileage; Generate an initial remaining power threshold according to the power required to complete the driving plan, the total capacity of the vehicle battery, and in combination with a safety factor; Adjust the initial remaining power threshold to obtain a dynamic remaining power threshold; the adjusted dynamic remaining power threshold falls within the safety range of the vehicle battery.

[0138] In an exemplary embodiment, when the power prediction module adjusts the initial remaining power threshold to obtain a dynamic remaining power threshold, it is also used for: Adjust the lower limit of the battery safety range according to the battery health state, and / or adjust the initial remaining power threshold according to the real - time driving condition coefficient to obtain a dynamic remaining power threshold; wherein, the real - time driving condition coefficient is determined according to road conditions and weather factors; the safety range of the vehicle battery is used to avoid over - charging or over - discharging of the battery.

[0139] In an exemplary embodiment, the system further includes a power stability control module, and the power stability control module is used to adopt a distributed model predictive control algorithm to adjust the vehicle's charging and discharging power in real time to ensure the stability of the micro - grid.

[0140] In an exemplary embodiment, in the power stability control module, a distributed model predictive control algorithm is adopted. With the goal of minimizing the voltage deviation and frequency deviation of the microgrid, by controlling the charging and discharging power, the voltage and frequency of the microgrid are allowed to fluctuate within the permitted range. Among them, the constraint conditions of the distributed model predictive control algorithm include the balance of charging and discharging power, as well as the upper and lower limits of the microgrid voltage and frequency.

[0141] In an exemplary embodiment, in the incentive module, the blockchain smart contract generates points according to the power and duration of vehicle reverse charging. The point calculation rules include a power point coefficient and a duration point coefficient, which are used to perform weighted calculations on the power and duration of reverse charging respectively.

[0142] For the above V2G-based interactive microgrid and intelligent charging pile collaborative optimization system, in this application, the incentive module constructs a point reward system through the blockchain smart contract to encourage users to participate in the V2G project and improve user participation. The time period matching module dynamically matches the vehicle charging and discharging behavior with the grid demand through a two-way time period matching algorithm to optimize the grid load distribution. The power and location coordination module ensures that while the vehicle meets the grid demand, it does not affect the normal use of the user by predicting the remaining power of the vehicle and guiding the charging; through the collaborative work of the time period matching module and the power and location coordination module, the system can dynamically adjust the charging and discharging behavior of electric vehicles, balance the grid load, and improve the stability and reliability of the grid; the system ensures the efficient allocation of power resources between the grid and electric vehicles through dynamic matching and optimization; in the case of large fluctuations in renewable energy, the system can use electric vehicles as buffer energy storage devices to smooth the power output and improve the utilization rate of renewable energy.

[0143] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the indication of the arrows, these steps do not necessarily need to be executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages do not necessarily need to be executed at the same moment, but can be executed at different moments. The execution order of these steps or stages does not necessarily need to be sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0144] Based on the same inventive concept, an embodiment of the present application further provides an energy interaction device for an energy storage charging pile for implementing the energy interaction method of the energy storage charging pile involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the energy interaction device for the energy storage charging pile provided below can refer to the limitations on the energy interaction method of the energy storage charging pile in the above text, and will not be repeated here.

[0145] In an exemplary embodiment, as Figure 4 shown, an energy interaction device for an energy storage charging pile is provided, configured in the energy storage charging pile. In the energy storage charging pile, the energy storage charging pile is provided with a charging interface, and the charging interface is connected to the output end of the mains power grid and the output end of the regional microgrid. The energy storage charging pile is further provided with a discharging interface, and the discharging interface is used to connect the device to be charged. The device includes: An energy replenishment module 41, configured to, when it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; wherein, the maintenance period corresponds to the low valley period of the mains power grid.

[0146] Each module in the above energy interaction device for the energy storage charging pile can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor in the energy storage charging pile in the form of hardware or be independent of the processor, or can be stored in the memory in the energy storage charging pile in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above respective modules.

[0147] In an exemplary embodiment, an energy storage charging pile is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented: When it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; wherein, the maintenance period corresponds to the low valley period of the mains power grid.

[0148] In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: When it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile, and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, then the energy storage charging pile is charged and stored from the commercial power grid through the charging interface, or interacts with the regional microgrid through the charging interface to charge and store the energy storage charging pile; Among them, the maintenance period corresponds to the low valley period of the commercial power grid.

[0149] In one embodiment, a computer program product is provided, including a computer program, which when executed by a processor, implements the following steps: When it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile, and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, then the energy storage charging pile is charged and stored from the commercial power grid through the charging interface, or interacts with the regional microgrid through the charging interface to charge and store the energy storage charging pile; Among them, the maintenance period corresponds to the low valley period of the commercial power grid.

[0150] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0151] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0152] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope recorded in this application.

[0153] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An energy interaction method for an energy storage charging pile, characterized in that, Applied to an energy storage charging pile, the energy storage charging pile is provided with a charging interface which is connected to the output end of the mains power grid and the output end of the regional microgrid. The energy storage charging pile is also provided with a discharging interface for connecting a device to be charged; The method includes: When it is determined that the current moment is within the maintenance period corresponding to the energy storage charging pile and it is determined whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery, then the energy storage charging pile is charged and stored with energy from the mains power grid through the charging interface, or interacts with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Among them, the maintenance period corresponds to the low valley period of the mains power grid.

2. The method according to claim 1, wherein The method further includes: If the remaining power of the energy storage charging pile is greater than or equal to the DOD upper limit value, enter the online standby mode, and the online standby mode can discharge the device to be charged; and / or, If the current moment is within the standby period, enter the online standby mode; the standby period corresponds to the non-low valley period of the mains power grid.

3. The method according to claim 1, wherein The charging and storing energy for the energy storage charging pile from the mains power grid through the charging interface, or interacting with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile includes: If it is determined that there is remaining energy in the regional microgrid, interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; If it is determined that there is no remaining energy in the regional microgrid, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface.

4. The method according to claim 3, characterized in that, The interacting with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile includes: If there is remaining energy in the photovoltaic power generation module in the regional microgrid, convert the direct current of the photovoltaic into the voltage level required by the energy storage charging pile through the AD-DC module, and charge and store energy for the energy storage charging pile through the charging interface; If there is remaining energy in the building load in the regional microgrid, absorb alternating current from the building mains power grid, convert it into direct current through the AD-DC module and store it to charge and store energy for the energy storage charging pile.

5. The method according to claim 1, characterized in that, The method further includes: When receiving a charging request initiated by the device to be charged, determine whether the energy storage charging pile is currently in a charging and replenishing energy state; If the energy storage charging pile is currently in a charging and replenishing energy state, stop charging; If it is in a non-charging and replenishing energy state, determine whether to charge the device to be charged according to the connection state between the device to be charged and the energy storage charging pile.

6. The method according to claim 5, wherein The determining whether to charge the device to be charged according to the connection state between the device to be charged and the energy storage charging pile includes: If it is determined that the connection state between the device to be charged and the energy storage charging pile is already connected to the energy storage charging pile, charge the device to be charged until the charging termination condition is reached; Among them, the charging termination condition includes at least one of the following: The device to be charged reaches the power threshold; Receive the execution of stopping charging initiated by the device to be charged; The remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery.

7. The method according to claim 6, wherein If it is determined that the connection status between the device to be charged and the energy storage charging pile is connected to the energy storage charging pile, then charging the device to be charged includes: If it is determined that the connection status between the device to be charged and the energy storage charging pile is connected to the energy storage charging pile, and the device to be charged has completed the online prepayment operation, then charge the device to be charged.

8. An energy interaction device for an energy storage charging pile, characterized in that, Configured in the energy storage charging pile, for the energy storage charging pile, the energy storage charging pile is provided with a charging interface, the charging interface is connected to the output end of the mains power grid and the output end of the regional microgrid, the energy storage charging pile is also provided with a discharging interface, and the discharging interface is used to connect the device to be charged. The device includes: The energy replenishment module is used to determine whether the current time is within the maintenance period corresponding to the energy storage charging pile, and determine whether the remaining power of the energy storage charging pile is less than the upper limit value of the depth of discharge (DOD) of the battery. Then, charge and store energy for the energy storage charging pile from the mains power grid through the charging interface, or interact with the regional microgrid through the charging interface to charge and store energy for the energy storage charging pile; Wherein, the maintenance period corresponds to the low valley period of the mains power grid.

9. An energy storage charging pile, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method according to any one of claims 1 to 7.

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