Energy storage charging pile capable of automatically supplementing electricity and circuit control method thereof

Abstract

The invention provides an energy storage charging pile capable of automatically supplementing electricity and a circuit control method thereof. Belongs to the technical field of direct-current charging. The energy storage charging pile comprises an energy storage lithium battery pack, a BMS control unit, a main controller, a man-machine interaction interface and a current switch module. The signal output end of the energy storage lithium battery pack is connected with the signal input end of the BMS control unit through a wire. The signal output end of the BMS control unit is connected with the first signal input end of the main controller through a wire. The first signal output end of the main controller is connected with the first signal input end of the current switch module through a wire. The charging pile is integrated with the energy storage lithium battery pack, off-peak electricity energy storage and peak electricity selling (vehicle charging) can be achieved, and higher benefits are provided for charging pile operation users.

Description

Technical Field

[0001] The present invention provides an energy storage charging pile capable of automatically replenishing electricity and a circuit control method thereof, belonging to the technical field of direct current charging. Background Art

[0002] With the rapid increase in the popularity of new energy electric vehicles, in areas with insufficient power load, the construction of traditional charging piles that rely on the power grid can hardly meet people's demand for high-power fast charging. In view of this situation, the present invention proposes a technical solution for energy storage charging piles, which configures a large-capacity energy storage lithium battery system for the DC charging pile, and adopts an ACDC / DC AC / DC dual-input charging module and a DCDC charging module to form an energy storage charging pile with automatic switching and automatic power replenishment of AC / DC input. It can automatically replenish power with the abundant low-valley electricity of the power grid at night. When someone scans the code to charge, it automatically switches the input and output modes to provide users with dual-module high-power fast charging services. It is easy to operate and use, and has extremely high promotion and application value. Summary of the invention

[0003] The present invention provides an energy storage charging pile capable of automatically replenishing electricity and a circuit control method thereof, to solve the problems mentioned in the above background technology:

[0004] The present invention provides an energy storage charging pile capable of automatically replenishing electricity, the energy storage charging pile comprising:

[0005] Energy storage lithium battery pack, BMS control unit, main controller, human-machine interaction interface and current switch module; the signal output end of the energy storage lithium battery pack is connected to the signal input end of the BMS control unit through a wire; the signal output end of the BMS control unit is connected to the first signal input end of the main controller through a wire; the first signal output end of the main controller is connected to the first signal input end of the current switch module through a wire; the second signal output end of the main controller is connected to the signal input end of the human-machine interaction interface through a wire; the first signal output end of the current switch module is connected to the signal input end of the BMS control unit through a wire; the second signal output end of the current switch module is connected to the second signal input end of the main controller through a wire; the third signal output end of the current switch module is connected to the third signal input end of the main controller through a wire; the fourth signal output and input ends of the main controller are bidirectionally connected to the fourth signal output and input ends of the current switch module respectively.

[0006] Furthermore, the current switch module includes an AC input switch unit, a DC input switch unit, a DC fast charging output switch unit and a rectifier negative contactor, the signal output end of the DC input unit is also the first signal output end and the second signal output end of the current switch module; the signal output end of the AC input unit and the third signal output end of the current switch module; the signal input end of the rectifier negative contactor is also the first signal input end of the current switch module; the signal output input end of the DC fast charging output switch unit is also the fourth signal output input end of the current switch module.

[0007] Furthermore, the AC input switch unit includes a three-phase distribution box, a three-phase AC charging gun, a charging base, an AC contactor, an intermediate relay, a main controller, a dual-input charging module and a wire. The plug of the three-phase AC charging gun is connected to the socket of the charging base, and the other end thereof, i.e., its power line, is connected to the three-phase distribution box, and the other end of the charging base, i.e., the power line, is connected to the input end of the AC contactor, and constitutes an AC input connection detection and control loop; the output end of the AC contactor is connected to the dual-input charging module, wherein the wire L3 of the distribution box is connected via the vehicle plug, the three-phase AC charging gun, the AC contactor and the D of the dual-input charging module The C+ phase is connected, and the wire L2 of the distribution box is connected via the three-phase AC charging gun, the charging seat, the AC contactor and the DC- phase of the dual-input charging module, forming the AC and DC input circuit and the public connection relationship of the dual-input charging module; one end of the AC contactor control coil is connected to the 24V- power supply, and the other end is connected to the common contact 5 of the intermediate relay via the emergency stop normally closed contact, and is connected to the main controller via the normally closed contact 1 of the intermediate relay, forming the control circuit of the AC contactor; one end of the normally open auxiliary contact of the AC contactor is connected to the main controller, and the other end is connected to the 12V+ power supply, forming a feedback loop of the AC contactor.

[0008] Furthermore, the DC input switch unit includes a DC contactor, an intermediate relay, a main controller, a DC input charging module and a wire. The control coils of the DC contactors K9 and K10 are connected in parallel, one end of which is connected to the intermediate relay control coil connection point 8 and the 24V-power supply, and the other end is connected to the intermediate relay control coil connection point 7, and is connected to the main controller via the normally closed auxiliary contact of the AC contactor, forming a control circuit of the DC contactors K9 and K10 and a mutually exclusive circuit with the AC contactor; the normally open auxiliary contacts of the DC contactors K9 and K10 are connected to the 24V-power supply, and the other end is connected to the intermediate relay control coil connection point 7. The auxiliary contacts are connected in parallel, one end of which is connected to the 12V+ power supply, and the other end is connected to the main controller, forming a feedback loop of the total state of the DC contactors K9 and K10. Any adhesion of any contactor can be detected by the main controller; the dual-input charging module in the AC input switch unit and the DC input charging module in this DC input switch unit, the DC+ and DC- at the input ends are respectively connected in series through DC contactors K9 and K10, wherein the DC+ and DC- of the DC input charging module are respectively connected to the total positive and total negative of the energy storage lithium battery pack controlled by the BMS control unit.

[0009] Furthermore, the DC fast charging output switch unit includes a charging positive contactor, a charging negative contactor, a charging gun and a wire, wherein the input ends of the charging positive contactor and the charging negative contactor are respectively connected to the output positive and output negative of the DC input charging module and the dual-input charging module, and the charging negative contactor and the rectifier negative contactor are connected in series to the total negative of the energy storage lithium battery pack, and the charging positive contactor and the rectifier positive contactor are connected in series to the total positive of the energy storage lithium battery pack; the control coils of the charging positive contactor and the charging negative contactor are connected in parallel, one end of the parallel connection is connected to the main controller, and the other end is connected to the 24-power supply, forming a parallel control of the charging positive contactor and the charging negative contactor; the normally open auxiliary contacts of the charging positive contactor and the charging negative contactor are connected in parallel, one end of the parallel connection is connected to the 12V+ power supply, and the other end is connected to the main controller, forming a feedback loop of the total state of the charging positive contactor and the charging negative contactor, and any adhesion of the contactor can be detected by the main controller.

[0010] Furthermore, the rectifier negative contactor is used to close the negative terminal contactor when the energy storage lithium battery pack is replenished.

[0011] Furthermore, the BMS control unit includes a pre-charging unit, a total positive contactor, a rectifier positive contactor, a total negative contactor, a BMS and a wire; the pre-charging unit includes a pre-charging relay, a pre-charging resistor and a wire; one end of the pre-charging relay and the total positive contactor are commonly connected to the total positive phase of the energy storage lithium battery pack, and the other end of the pre-charging relay is connected in series with the pre-charging resistor and then connected to the other end of the total positive contactor to form a control loop of the pre-charging unit; one end of the rectifier positive contactor is connected to the total positive phase of the energy storage lithium battery pack, and the other end is connected to the output positive phase of the DC input charging module and the dual input charging module; the other ends of the total positive contactor and the total negative contactor are respectively connected to the output positive and output negative phases of the DC input charging module in the DC fast charging output switch unit, the acquisition end of the BMS is connected to the energy storage lithium battery pack, and its CAN communication end is connected to the main controller. The pre-charging relay, the total positive contactor, the rectifier positive contactor, and the total negative contactor are all controlled by the BMS.

[0012] Furthermore, the energy storage lithium battery pack is used to provide a DC input power source for the DC input charging module and the dual-input charging module.

[0013] Furthermore, the main controller is used to receive instructions from the human-computer interaction interface and control the working status of each unit according to the instructions; at the same time, it monitors the operating status of the entire charging pile; the main controller integrates a 4G communication function, which is used to report data to an external cloud platform or accept external control commands; the human-computer interaction interface is used to configure operating parameters to the main controller or issue control and query commands, or echo operating parameters and status.

[0014] A circuit control method proposed in the present invention is implemented using any of the energy storage charging piles described above, and the control method includes:

[0015] When the charging pile receives external power, the main controller initializes the working status of all control units and reads the current status information through the human-computer interaction interface;

[0016] The main controller detects whether there is external AC power input through the AC input switch unit;

[0017] If the AC power supply is connected normally, the main controller controls whether to establish a connection with the dual-input charging module through the AC contactor and the intermediate relay; and monitors the working status of the AC power supply in real time through the feedback loop;

[0018] The DC input switch unit controls whether the DC power supply is connected according to system requirements. The DC contactors K9 and K10 complete the current path control of the DC charging module and the energy storage lithium battery pack by connecting with the intermediate relay;

[0019] The BMS control unit monitors the voltage and current status of the energy storage lithium battery pack, controls the switches of DC contactors K9 and K10, monitors the performance parameters of the energy storage lithium battery pack, and performs preliminary charging of the battery through the pre-charging unit;

[0020] If the battery status is normal, the BMS control unit controls the battery charging process through the total positive contactor K1 and the total negative contactor K2, collects the battery status information in real time, and uploads the data to the cloud platform or displays it through the human-computer interaction interface;

[0021] When the energy storage lithium battery pack has been fully charged or reaches the set voltage level, the main controller controls the DC fast charging output switch unit to start;

[0022] By controlling the opening and closing of contactors K8 and K7, the main controller transfers the electric energy of the energy storage lithium battery pack to the external load through the DC fast charging output module;

[0023] During the entire charging process, the main controller monitors the charging process in real time, detects the charging status feedback loop, and disconnects the circuit through the corresponding safety mechanism;

[0024] When the power level of the energy storage lithium battery pack is lower than the set threshold, the main controller triggers the automatic charging function and automatically switches to DC input or AC input power. If any abnormal situation occurs during the charging process, the BMS control unit and the main controller trigger the protection mechanism, stop charging, and notify the user through the alarm system;

[0025] The main controller exchanges data with the external cloud platform through the 4G communication function, uploads relevant data, and receives external control commands;

[0026] The user uses the human-machine interface and makes corresponding settings. When the charging process is completed or a fault occurs during the charging process, the main controller automatically ends the charging according to the settings and checks the status of all contactors through the feedback loop to ensure the normal disconnection of the contactors.

[0027] All fault information is displayed through the human-computer interaction interface and fed back to operation and maintenance personnel or users through the cloud platform.

[0028] Beneficial effects of the present invention:

[0029] 1. The charging pile integrates a lithium battery pack for energy storage, which can realize valley power storage and peak power sales (for vehicle charging), thus increasing the profits for charging pile operators;

[0030] 2. According to the program strategy, the working mode of charging during off-peak hours and charging during busy hours can be automatically switched. That is, when no one scans the code to charge, the system automatically enters the AC input self-charging mode without external intervention. And according to the program strategy, it can automatically charge during the period with the cheapest electricity price to reduce the operating cost of charging pile users;

[0031] 3. It can realize automatic hard-wire switching between AC input and DC input, achieve complete mutual exclusion, effectively avoid the commonality of AC input and DC input, and effectively ensure the safety of the system, especially the safety of the energy storage lithium battery pack;

[0032] 4. In the present invention, the AC contactor (KM1) and the DC input contactor (K7~K8), the total negative contactor (K2) and the rectifier negative contactor (K11) are mutually exclusive in principle design. The present invention cleverly realizes this mutual exclusion through the cross-application of the intermediate relay (KA1) and the respective normally closed auxiliary contacts, effectively avoiding the commonality of AC input and DC input, and also effectively avoiding the situation where the energy storage lithium battery pack is directly connected to the external charging system under DC discharge conditions, effectively ensuring the safety of the system, especially the charging safety, and the reliability of the system is extremely high. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural diagram of the charging pile of the present invention;

[0034] Figure 2 This is a working principle diagram of the present invention;

[0035] Figure 3 A partial enlarged view of KA1 of the present invention;

[0036] Figure 4 This is a partial enlarged view of the DC input charging module of the present invention. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] One embodiment of the present invention, as Figure 1 As shown, an energy storage charging pile capable of automatically replenishing electricity, the energy storage charging pile comprises:

[0039] Energy storage lithium battery pack, BMS control unit, main controller, human-machine interaction interface and current switch module; the signal output end of the energy storage lithium battery pack is connected to the signal input end of the BMS control unit through a wire; the signal output end of the BMS control unit is connected to the first signal input end of the main controller (MCU) through a wire; the first signal output end of the main controller (MCU) is connected to the first signal input end of the current switch module through a wire; the second signal output end of the main controller (MCU) is connected to the signal input end of the human-machine interaction interface through a wire; the first signal output end of the current switch module is connected to the signal input end of the BMS control unit through a wire; the second signal output end of the current switch module is connected to the second signal input end of the main controller through a wire; the third signal output end of the current switch module is connected to the third signal input end of the main controller through a wire; the fourth signal output and input ends of the main controller are bidirectionally connected to the fourth signal output and input ends of the current switch module respectively.

[0040] The current switch module includes an AC input switch unit, a DC input switch unit, a DC fast charging output switch unit and a rectifier negative contactor (K11), the signal output end of the DC input unit is also the first signal output end and the second signal output end of the current switch module; the signal output end of the AC input unit and the third signal output end of the current switch module; the signal input end of the rectifier negative contactor is also the first signal input end of the current switch module; the signal output input end of the DC fast charging output switch unit is also the fourth signal output input end of the current switch module.

[0041] The working principle of the above technical solution is as follows: the status of the energy storage lithium battery pack (such as power, temperature, etc.) is sent to the BMS (battery management system) control unit through its signal output end; after the BMS control unit analyzes the status of the energy storage lithium battery pack, it sends the relevant information to the main controller (MCU) through its signal output end; the main controller receives the signal from the BMS control unit and determines whether the energy storage lithium battery pack needs to be charged or discharged according to the preset algorithm and logic; if charging is required, the main controller will send a signal to the current switch module to start the charging process; if discharging is required (for example, charging an electric car), the main controller will also send a corresponding signal to the current switch module. When the AC input switch unit needs to be charged with an external AC power source, this unit will open or close according to the signal of the main controller to allow AC power to enter the charging pile. When the DC input switch unit needs to be charged with an external DC power source, this unit will perform corresponding operations according to the signal of the main controller. DC fast charging output switch unit When the energy storage lithium battery pack is fully charged and needs to be fast charged for electric vehicles and other equipment, this unit will open according to the signal of the main controller to allow DC output; Rectifier negative contactor (K11) This contactor may be used to control the flow of current or perform circuit protection during the charging process. It performs opening and closing operations according to the signal of the main controller; The main controller is connected to the human-machine interaction interface (such as display screen, button, etc.) through its second signal output terminal, allowing the user to view the status of the charging pile (such as power, charging speed, etc.) and perform corresponding operations (such as starting charging, stopping charging, etc.); After the current switch module performs the corresponding operation, it will feedback the operation results to the main controller through its second signal output terminal and the third signal output terminal to ensure the correctness and safety of the operation. The bidirectional connection between the main controller and the fourth signal output input terminal of the current switch module may be used for more complex communication or status monitoring.

[0042] The effect of the above technical solution is: through the coordinated work of the main controller (MCU) and the BMS (battery management system) control unit, the intelligent management of the energy storage lithium battery pack is realized. The MCU can receive the battery status information from the BMS in real time, such as power, voltage, temperature, etc., and make decisions based on this information to control the current switch module to perform corresponding operations, such as charging, discharging or maintaining standby status; the current switch module includes an AC input switch unit, a DC input switch unit and a DC fast charging output switch unit, which can respond quickly according to the instructions of the MCU to achieve efficient charging and discharging operations. In particular, the DC fast charging output switch unit can support the fast charging function to meet the fast charging needs of electric vehicles and other equipment; the rectifier negative contactor (K11) as part of the current switch module can cut off the circuit when necessary to provide additional safety protection. At the same time, by receiving the feedback signal of the current switch module, the MCU can monitor the working status of the charging pile in real time, detect and handle abnormal situations in time, and ensure the safe operation of the charging pile; the design of the human-computer interaction interface enables users to easily view the status information of the charging pile, such as power, charging speed, etc., and make corresponding operation settings. This design improves the user experience and makes the use of the charging pile more convenient and intuitive; the technical solution uses modular design so that each part of the energy storage charging pile can be upgraded or replaced independently, improving the scalability and flexibility of the system. With the continuous development of technology, new functions can be easily introduced or existing functions can be optimized to meet the ever-changing market needs; through intelligent management, the energy storage charging pile can fully utilize the energy of the energy storage lithium battery pack and reduce energy waste. At the same time, it can also support the access and storage of renewable energy such as solar and wind energy, and contribute to environmental protection.

[0043] In one embodiment of the present invention, the AC input switch unit includes a three-phase distribution box, a three-phase AC charging gun, a charging base, an AC contactor (KM1), an intermediate relay (KA1), a main controller (MCU), a dual-input charging module (ACDC / DC) and a wire, wherein the plug of the three-phase AC charging gun is connected to the socket of the charging base, and the other end thereof, i.e., the power cord thereof, is connected to the three-phase distribution box, and the other end of the charging base, i.e., the power cord, is connected to the input end of the AC contactor (KM1), thereby forming an AC input connection detection and control circuit; the output end of the AC contactor (KM1) is connected to the dual-input charging module (ACDC / DC) , wherein the wire L3 of the distribution box is connected via the vehicle plug, the three-phase AC charging gun, the AC contactor (KM1) and the DC+ phase of the dual-input charging module (ACDC / DC), and the wire L2 of the distribution box is connected via the three-phase AC charging gun, the charging seat, the AC contactor (KM1) and the DC- phase of the dual-input charging module (ACDC / DC), forming the AC and DC input circuit and public connection relationship of the dual-input charging module (ACDC / DC); one end of the control coil of the AC contactor (KM1) is connected to the 24V- power supply, and the other end is connected to the common contact 5 of the intermediate relay (KA1) via the emergency stop normally closed contact (JT1), such as Figure 3 As shown, it is connected to the main controller (MCU) via the normally closed contact 1 of the intermediate relay (KA1), forming a control circuit of the AC contactor (KM1); one end of the normally open auxiliary contact of the AC contactor (KM1) is connected to the main controller (MCU), and the other end is connected to the 12V+ power supply, forming a feedback loop of the AC contactor (KM1).

[0044] The working principle of the above technical solution is as follows: when the plug of the three-phase AC charging gun is inserted into the socket of the charging base, a physical connection is formed. At this time, the AC input connection detection and control circuit starts to work; the charging base is connected to the input end of the AC contactor (KM1) through its power cord to prepare for the subsequent charging process; one end of the control coil of the AC contactor (KM1) is connected to the 24V-power supply, and the other end is connected to the main controller (MCU) through the emergency stop normally closed contact (JT1) and the common contact 5 and normally closed contact 1 of the intermediate relay (KA1). This circuit is the key to controlling whether the AC contactor (KM1) is energized; when the main controller (MCU) detects that the charging gun has been correctly inserted and there is no emergency stop signal, it will send a signal to make the intermediate relay (KA1) energize, thereby closing its normally closed contact 1. At this time, the 24V power supply supplies power to the control coil of the AC contactor (KM1) through the emergency stop normally closed contact (JT1) and the contacts of the intermediate relay (KA1), causing it to be attracted; once the AC contactor (KM1) is attracted, its output end is connected to the dual-input charging module (ACDC / DC), forming an AC / DC input circuit; the wire L3 of the distribution box passes through the vehicle plug, the three-phase AC charging gun, the AC contactor (KM1) and the DC+ end of the dual-input charging module (ACDC / DC), while the wire L2 passes through the three-phase AC charging gun, the charging seat, the AC contactor (KM1) and the DC- end of the dual-input charging module (ACDC / DC), realizing the conversion and transmission of AC to DC; one end of the normally open auxiliary contact of the AC contactor (KM1) is connected to the main controller (MCU), and the other end is connected to the 12V+ power supply. When the AC contactor (KM1) is energized, this normally open auxiliary contact is closed, forming a feedback loop, sending a confirmation signal to the main controller (MCU), indicating that the AC contactor (KM1) has been correctly energized and the charging process can proceed safely; during the entire charging process, the main controller (MCU) continuously monitors the charging status, including current, voltage, temperature and other parameters to ensure the safety and efficiency of the charging process; if any abnormal conditions are detected, such as overcurrent, overvoltage, overheating, etc., the main controller (MCU) will immediately send a signal to disconnect the intermediate relay (KA1), thereby cutting off the control power supply of the AC contactor (KM1), disconnecting it, and stopping the charging process to protect the safety of equipment and personnel.

[0045] The effects of the above technical solution are as follows: by introducing the AC contactor (KM1) and the intermediate relay (KA1), precise control of the charging process is achieved. When the main controller (MCU) detects that the charging conditions are met, it controls the closing and opening of the AC contactor (KM1) by controlling the attraction and disconnection of the intermediate relay (KA1), thereby ensuring charging under safe conditions; the setting of the emergency stop normally closed contact (JT1) provides the possibility of quickly cutting off the power supply in an emergency, further improving the safety performance of the charging pile; the introduction of the dual-input charging module (ACDC / DC) enables the charging pile to support the input of both AC and DC power, improving the flexibility and efficiency of charging. At the same time, the module can efficiently convert the input AC power into DC power, providing a stable charging current and voltage for the energy storage lithium battery pack; the main controller (MCU), as the core of the entire charging system, can monitor various parameters in the charging process, such as current, voltage, temperature, etc. in real time, and make intelligent judgments and adjustments according to the preset algorithms and logic to ensure the safety, efficiency and stability of the charging process; by connecting to the normally open auxiliary contacts of the AC contactor (KM1), the main controller (MCU) can obtain the status information of the AC contactor in real time, thereby realizing precise control of the charging process; the technical solution adopts a modular design, with clear connections and compact structure between various components, which is convenient for later maintenance and upgrading. At the same time, due to the use of standardized interfaces and protocols, it is easy to expand other functions or access other devices; through intelligent management and efficient power conversion, the charging pile can minimize energy waste and environmental pollution. At the same time, it can also support the access and storage of renewable energy and contribute to environmental protection.

[0046] In one embodiment of the present invention, the DC input switch unit includes a DC contactor (K9-K10), an intermediate relay (KA1), a main controller (MCU), and a DC input charging module (DCDC). Figure 4As shown, and the wire, the control coils of the DC contactors K9 and K10 are connected in parallel, one end of the parallel connection is connected to the control coil connection point 8 of the intermediate relay (KA1) and the 24V- power supply, and the other end is connected to the control coil connection point 7 of the intermediate relay (KA1), and is connected to the main controller (MCU) via the normally closed auxiliary contact of the AC contactor (KM1), forming a control circuit of the DC contactors K9 and K10 and a mutually exclusive circuit with the AC contactor (KM1); the normally open auxiliary contacts of the DC contactors K9 and K10 are connected in parallel, one end of which is connected to the 12V+ power supply, The other end is connected to the main controller (MCU) to form a feedback loop of the total status of DC contactors K9 and K10. Any adhesion of any contactor can be detected by the main controller (MCU); the dual-input charging module (ACDC / DC) in the AC input switch unit and the DC input charging module (DCDC) in this DC input switch unit, the DC+ and DC- at their input ends are connected in series through DC contactors K9 and K10, respectively, wherein the DC+ and DC- of the DC input charging module (DCDC) are respectively connected to the total positive and total negative of the energy storage lithium battery pack controlled by the BMS control unit.

[0047] The working principle of the above technical solution is as follows: the control coils of DC contactors K9 and K10 are connected in parallel, which means that they can be controlled at the same time. However, since their control circuits are connected to the normally closed auxiliary contacts of AC contactor KM1, when AC contactor KM1 is closed (i.e., when AC charging is performed), the control circuits of DC contactors K9 and K10 are disconnected to ensure that they are not closed at the same time, thus achieving a mutually exclusive relationship; when the main controller MCU decides to perform DC charging, it sends a signal to close the intermediate relay KA1, thereby closing the connection points 7 and 8 of its control coils (here it is assumed that connection point 8 is connected to a 24V-power supply). Since one end of the control coils of K9 and K10 are connected in parallel to connection point 8 and the other end is connected to connection point 7 (through the normally closed auxiliary contacts of KM1, but not closed during AC charging), the control coils of K9 and K10 are powered to close them; the normally open auxiliary contacts of DC contactors K9 and K10 are also connected in parallel. When they are closed, this parallel normally open auxiliary contact is connected to the 12V+ power supply and sends a confirmation signal to the main controller MCU, indicating that K9 and K10 have been correctly closed; if any contactor (K9 or K10) is stuck (i.e. cannot be disconnected), the main controller MCU can detect this by monitoring the state of this feedback loop and take appropriate measures, such as stopping charging or sounding an alarm; when DC contactors K9 and K10 are closed, they connect the DC+ and DC- terminals of the DC input charging module DCDC to the total positive and total negative terminals of the energy storage lithium battery pack respectively. In this way, DC power can be input into the energy storage lithium battery pack through the DCDC module for charging; during the entire charging process, the main controller MCU continuously monitors the charging status, including parameters such as current, voltage, and temperature, to ensure the safety and efficiency of the charging process; if any abnormal situation is detected, such as overcurrent, overvoltage, overheating, etc., the main controller MCU will immediately send a signal to disconnect the intermediate relay KA1, thereby cutting off the control power supply of DC contactors K9 and K10, disconnecting them, and stopping the charging process to protect the safety of equipment and personnel.

[0048] The effect of the above technical solution is: after the control coils of DC contactors K9 and K10 are connected in parallel, a mutually exclusive circuit is formed through the intermediate relay KA1 and the normally closed auxiliary contacts of AC contactor KM1. This design ensures that when AC contactor KM1 is closed (usually indicating that the AC power supply has been connected), DC contactors K9 and K10 cannot be closed at the same time, thereby avoiding potential conflicts between DC power supply and AC power supply and improving the safety of the system; after the normally open auxiliary contacts of DC contactors K9 and K10 are connected in parallel, they are connected to the main controller MCU to form a feedback loop. This design enables the main controller to monitor the status of the DC contactor in real time. Once any contactor is found to be sticky (i.e., it cannot be disconnected normally), the main controller can immediately take measures, such as issuing an alarm or cutting off the power supply, to prevent the fault from further expanding; the system also includes a dual input charging module (ACDC / DC) in the AC input switch unit and a DC input charging module (DCDC) in the DC input switch unit. This design allows the system to flexibly choose to use AC power or DC power for charging according to actual conditions, which improves the flexibility and adaptability of the system; the DC+ and DC- of the DC input charging module (DCDC) are respectively connected to the total positive and total negative of the energy storage lithium battery pack controlled by the BMS (battery management system) control unit. This design enables the system to accurately control the charging process of the energy storage lithium battery pack to ensure the safe and efficient operation of the battery pack. At the same time, the BMS can also monitor the status of the battery pack in real time, such as power, temperature, etc., to provide a strong guarantee for the stable operation of the system; through reasonable circuit design and component selection, the scheme simplifies the circuit structure and reduces the complexity of the system. For example, the use of parallel DC contactors K9, K10 and intermediate relays KA1 and other components reduces the connection points and potential fault points in the circuit, and improves the stability and reliability of the system; the DC input charging module (DCDC) and AC input charging module (ACDC / DC) in this scheme both use efficient power conversion technology, which can efficiently convert the input power into the DC power required by the energy storage lithium battery pack. At the same time, by accurately controlling the charging process, energy loss and waste are reduced, and the overall efficiency of the system is improved.

[0049] In one embodiment of the present invention, the DC fast charging output switch unit comprises a charging positive contactor (K7), a charging negative contactor (K8), a charging gun and a wire, wherein the input ends of the charging positive contactor (K7) and the charging negative contactor (K8) are respectively connected to the output positive and output negative of a DC input charging module (DCDC) and a dual input charging module (ACDC / DC), and the charging negative contactor (K8) and the rectifier negative contactor (K11) are connected in series to the total negative of an energy storage lithium battery pack, and the charging positive contactor (K7) and the rectifier positive contactor (K6) are connected in series to the total positive of an energy storage lithium battery pack; the charging positive contactor (K7) ), and the control coils of the charging negative contactor (K8) are connected in parallel, one end of which is connected to the main controller (MCU), and the other end is connected to the 24-power supply, forming a parallel control of the charging positive contactor (K7) and the charging negative contactor (K8); the normally open auxiliary contacts of the charging positive contactor (K7) and the charging negative contactor (K8) are connected in parallel, one end of which is connected to the 12V+ power supply, and the other end is connected to the main controller (MCU), forming a feedback loop of the total state of the charging positive contactor (K7) and the charging negative contactor (K8), and any adhesion of any contactor can be detected by the main controller (MCU).

[0050] The working principle of the above technical solution is as follows: the control coils of the positive charging contactor (K7) and the negative charging contactor (K8) are connected in parallel. When the main controller (MCU) decides to start charging, it sends a control signal to energize the control coils of the two contactors. Since they are connected in parallel, they will close at the same time, thereby establishing a charging path from the charging module to the energy storage lithium battery pack. The other end of the control coil is connected to the 24V- power supply to form a complete control loop. When the control signal sent by the MCU energizes the intermediate relay or directly energizes the control coil, the contactor will close; when the positive charging contactor (K7) and the negative charging contactor (K8) are closed, they respectively connect the output positive and output negative of the DC input charging module (DCDC) or the dual input charging module (ACDC / DC) to the total positive and total negative of the energy storage lithium battery pack. In this way, the electrical energy can be safely transferred to the battery pack for charging through these two contactors; it should be noted that the charging negative contactor (K8) is connected in series with the rectifier negative contactor (K11), and the charging positive contactor (K7) is also connected in series with the rectifier positive contactor (K6). The normally open auxiliary contacts of the charging positive contactor (K7) and the charging negative contactor (K8) are also connected in parallel. When the two contactors are closed, their normally open auxiliary contacts are also closed, forming a feedback loop with the 12V+ power supply. This feedback loop sends a signal back to the main controller (MCU) to inform it that the contactor has been properly closed and the charging path has been established; if any of the contactors becomes stuck (i.e., it cannot be disconnected normally), the main controller MCU can detect this by monitoring the status of this feedback loop. Once sticking is detected, the MCU can take immediate action, such as stopping charging or sounding an alarm, to prevent the fault from further expanding.

[0051] The effect of the above technical solution is: the control coils of the charging positive contactor (K7) and the charging negative contactor (K8) are designed in parallel to ensure that both can be controlled by the main controller (MCU) at the same time to achieve synchronous action. This design simplifies the control logic and reduces the probability of error; through the parallel connection of the normally open auxiliary contacts, a feedback loop is formed to the main controller (MCU), which can monitor the status of the contactor in real time. Once any contactor is stuck, the MCU can immediately detect and take measures, such as stopping charging or sounding an alarm, to effectively prevent the expansion of the fault and ensure the safety of the charging process; the charging negative contactor (K8) and the rectifier negative contactor (K11) are connected in series to the total negative of the energy storage lithium battery pack, and the charging positive contactor (K7) and the rectifier positive contactor (K6) are connected in series to the total positive of the energy storage lithium battery pack. This design provides additional electrical protection during the charging process, ensuring that the charging path can be quickly cut off in abnormal circumstances to protect the battery pack from damage; the DC fast charging output switch unit can simultaneously connect the DC input charging module (DCDC) and the dual input charging module (ACDC / DC), realizing the diversification of charging methods. According to actual needs, the system can select the optimal charging module for charging, which improves charging efficiency and flexibility; the main controller (MCU) as the core of the entire charging system can intelligently control the action of the contactor and the switching of the charging module according to factors such as the status of the battery pack, charging requirements and external conditions. This intelligent management method not only improves the charging efficiency, but also extends the service life of the battery pack; the technical solution adopts a modular design, and the connections between the various components are clear and easy to disassemble and replace. This design reduces the maintenance cost of the system and improves the scalability and upgradeability of the system; through the real-time monitoring and feedback function of the main controller (MCU), the system can promptly detect and diagnose fault points. This not only simplifies the troubleshooting process, but also improves the reliability and stability of the system.

[0052] In one embodiment of the present invention, the rectifier negative contactor (K11) is used to close the negative terminal contactor when the energy storage lithium battery pack is supplemented with electricity.

[0053] The working principle of the above technical solution is as follows: when the energy storage lithium battery pack needs to be charged, the system will first perform a series of preparations, including detecting the state of the battery pack (such as power, temperature, etc.), selecting a suitable charging module (DC input charging module DCDC or dual input charging module ACDC / DC), and setting charging parameters. After the charging preparation stage is completed, the main controller (MCU) will send a control signal to the charging positive contactor (K7) and the charging negative contactor (K8) to close them. At the same time, if the battery pack needs to be recharged (for example, when the battery pack is low in power), the MCU will also send a control signal to the rectifier negative contactor (K11) to close it. When the charging positive contactor (K7), the charging negative contactor (K8) and the rectifier negative contactor (K11) are all closed, the charging path is established. At this time, the charging module begins to convert electrical energy into DC power suitable for charging the battery pack, and flows into the battery pack through the charging path for charging. During the charging process, the MCU will continuously monitor the state of the battery pack and parameters such as charging current and voltage to ensure the safety and efficiency of the charging process. If any abnormal situation is detected (such as the battery pack temperature is too high, the charging current is too large, etc.), the MCU will immediately take measures (such as stopping charging, disconnecting the contactor, etc.) to protect the battery pack from damage. When the battery pack is fully charged or reaches the preset charging termination condition, the MCU will send a control signal to the charging positive contactor (K7), charging negative contactor (K8) and rectifier negative contactor (K11) to disconnect them. In this way, the charging path is cut off and the charging process ends. After charging is completed, the MCU may also perform a series of subsequent operations, such as recording charging data, updating battery pack status information, etc.

[0054] The effect of the above technical solution is as follows: the introduction of the rectifier negative contactor (K11) enables the charging system to be flexibly adjusted according to the real-time status and needs of the energy storage lithium battery pack. When the battery pack needs to be recharged, K11 can be quickly closed to establish a complete charging path to ensure that the electric energy can be efficiently transmitted to the battery pack. This design improves the flexibility and adaptability of the charging system, enabling it to cope with different charging scenarios and needs; during the charging process, the closing and opening of the rectifier negative contactor (K11) are precisely controlled by the main controller (MCU). This control method ensures the stability and safety of the charging process. Once an abnormality is detected in the battery pack or the charging system, the MCU can immediately cut off the charging path by controlling contactors such as K11 to prevent the fault from further expanding. In addition, the closing and opening status of K11 can also be monitored in real time through a feedback loop, further enhancing the safety and reliability of the charging process; the precise control of the rectifier negative contactor (K11) helps to optimize the charging efficiency. During the recharging process, the timely closing of K11 can ensure that the electric energy is transmitted to the battery pack in the best way, reducing energy loss and waste. At the same time, this precise control method also helps to extend the service life of the battery. By avoiding damage to the battery caused by adverse factors such as overcharging and over-discharging, the introduction of K11 helps to keep the battery in good condition and extend its service life. As an independent component in the charging system, the design and installation of the rectifier negative contactor (K11) are relatively simple. This design makes it easier to maintain and troubleshoot the charging system. Once a fault occurs, key components such as K11 can be quickly located and repaired or replaced accordingly. This simplified maintenance and troubleshooting process helps to improve the operating efficiency and reliability of the charging system.

[0055] In one embodiment of the present invention, the BMS control unit comprises a pre-charging unit, a total positive contactor (K1), a rectifier positive contactor (K6), a total negative contactor (K2), a BMS and a wire; the pre-charging unit comprises a pre-charging relay (K3), a pre-charging resistor (R) and a wire; one end of the pre-charging relay (K3) and the total positive contactor (K1) are commonly connected to the total positive phase of the energy storage lithium battery pack, and the other end of the pre-charging relay (K3) is connected in series with the pre-charging resistor (R) and then connected to the other end of the total positive contactor (K1), forming a control circuit of the pre-charging unit; one end of the rectifier positive contactor (K6) is connected to the energy storage The lithium battery pack is connected to the positive terminal, and the other end is connected to the positive output of the DC input charging module (DCDC) and the dual input charging module (ACDC / DC); the other ends of the total positive contactor (K1) and the total negative contactor (K2) are respectively connected to the positive output and negative output of the DC input charging module (DCDC) in the DC fast charging output switch unit. The acquisition end of the BMS is connected to the energy storage lithium battery pack, and its CAN communication end is connected to the main controller (MCU); the pre-charging relay (K3), the total positive contactor (K1), the rectifier positive contactor (K6), and the total negative contactor (K2) are all controlled by the BMS.

[0056] The working principle of the above technical solution is: when the energy storage lithium battery pack needs to be charged, the BMS will first control the pre-charge relay (K3) to close. At this time, the current will charge the battery pack with a small current through the pre-charge resistor (R), and this process is called pre-charging; the purpose of pre-charging is to activate the chemical reaction of the battery, restore the normal working state of the battery, and prevent battery damage caused by directly applying high current charging. The BMS will continuously monitor the voltage changes of the battery. When the battery voltage reaches a certain threshold (such as 3.0V or 3.2V, the specific value depends on the battery type and BMS settings), the system will determine that the battery is ready for high-current charging; once the battery voltage reaches the pre-charge threshold, the BMS will control the total positive contactor (K1) to close, and disconnect the pre-charge relay (K3) to switch the battery pack to normal charging mode; in normal charging mode, the rectifier positive contactor (K6) will also close, so that the output positive of the DC input charging module (DCDC) or the dual-input charging module (ACDC / DC) can be connected to the total positive of the battery pack; the current will bypass the pre-charge resistor (R) and directly charge the battery pack with a large current; the BMS will continue to monitor the battery voltage, Parameters such as current and temperature to ensure the safety and efficiency of the charging process; when the battery pack is fully charged or reaches the charging termination condition set by the BMS, the BMS will control the rectifier positive contactor (K6) and the main positive contactor (K1) to disconnect and stop the charging process; if any abnormality is detected during the charging process (such as overtemperature, overcurrent, overvoltage, etc.), the BMS will also immediately disconnect the relevant contactors to protect the safety of the battery pack and the charging system; the acquisition end of the BMS is connected to the energy storage lithium battery pack for real-time acquisition of battery parameters such as voltage, current and temperature; the CAN communication end of the BMS is connected to the main controller (MCU) to transmit the collected data and other status information to the MCU for further processing or display.

[0057] The effects of the above technical solution are as follows: the pre-charging unit pre-charges the battery pack with a small current at the initial stage of charging through the series design of the pre-charging relay (K3) and the pre-charging resistor (R), effectively avoiding battery damage or safety accidents that may be caused by direct high-current charging. This design reduces the current shock generated when the internal resistance of the battery suddenly decreases, protecting the health of the battery pack; the pre-charging relay (K3), the total positive contactor (K1), the rectifier positive contactor (K6) and the total negative contactor (K2) are all precisely controlled by the BMS to ensure reliable connection and disconnection of the circuit during the charging process. This precise control helps to quickly cut off the circuit in abnormal situations, prevent the expansion of faults, and further improve the safety of the charging process; the design of the rectifier positive contactor (K6) enables the system to support the switching or simultaneous use of the DC input charging module (DCDC) and the dual input charging module (ACDC / DC), thereby improving the flexibility and adaptability of the charging system. This design enables the system to select the appropriate charging method according to actual needs and optimize charging efficiency; BMS, as the core control unit of the charging system, can monitor key parameters such as voltage, current and temperature of the battery pack in real time, and adjust the charging strategy based on these data. This intelligent charging management helps to avoid damage to the battery caused by adverse factors such as overcharging and over-discharging, while improving charging efficiency; the entire charging control system adopts a modular design, and the connections between components are simple and clear. This design enables the system to quickly locate the problem when a fault occurs, making it easy to repair and replace faulty components; BMS is connected to the main controller (MCU) through CAN communication, and can transmit important data such as the charging status and fault information of the battery pack in real time. This data acquisition and communication function helps operation and maintenance personnel to understand the system status in a timely manner and perform preventive maintenance; through precise charging control and intelligent management, this technical solution helps to reduce battery loss and damage during the charging process. This protection mechanism can extend the service life of the battery and reduce the frequency and cost of battery replacement.

[0058] In one embodiment of the present invention, the energy storage lithium battery pack is used to provide a DC input power source for a DC input charging module (DCDC) and a dual input charging module (ACDC / DC).

[0059] The working principle of the above technical solution is as follows: the energy storage lithium battery pack is a device that converts electrical energy into chemical energy for storage, and converts chemical energy into electrical energy when needed. It is mainly composed of multiple lithium battery cells connected in series or in parallel to provide the required voltage and capacity. During the charging process, the electrical energy provided by the external power supply is converted into chemical energy and stored inside the battery through the charging system; during the discharge process, the chemical energy inside the battery is converted into electrical energy output to power the load device; the DC input charging module (DCDC) is a device that converts the input DC power into a constant DC voltage or constant DC current at the output end. It usually consists of an input filter circuit, a power conversion circuit, an output filter circuit, a control circuit and other parts. During the charging process, the DCDC module receives DC power from the energy storage lithium battery pack, converts it into a voltage and current suitable for battery charging through the internal power conversion circuit, and then outputs it to the battery for charging. At the same time, the DCDC module also has protection functions such as overcurrent, overvoltage, and short circuit to ensure the safety of the charging process; the dual input charging module (ACDC / DC) is a charging module that supports both AC input and DC input. It usually contains two input ports, one for receiving AC power (such as mains power) and the other for receiving DC power (such as power from a lithium battery pack for energy storage). In the AC input mode, the ACDC module first converts the input AC power into DC power, and then performs subsequent charging operations. In the DC input mode, the ACDC module directly receives DC power from the lithium battery pack for charging. In addition, the ACDC module also has the function of intelligently identifying the input power type, and can automatically adjust the charging strategy according to the input power type; when the energy storage lithium battery pack is fully charged, it can be used as a DC input power source for the DC input charging module (DCDC) and the dual input charging module (ACDC / DC). At this time, the battery pack is in a discharging state, providing the required DC power for the charging module. When it is necessary to charge the lithium battery pack for energy storage, if the DCDC module is used, it is directly connected to the output end of the battery pack, and the input DC power is converted into a voltage and current suitable for battery charging through the power conversion function of the DCDC module for charging; if the ACDC / DC module is used and the DC input mode is selected, it is also connected to the output end of the battery pack for charging. If the AC input mode is selected, the ACDC module will convert the input AC power into DC power before charging; during the entire charging process, the BMS (battery management system) will monitor the voltage, current, temperature and other parameters of the battery pack in real time, and adjust the charging strategy based on these parameters to ensure the safety and efficiency of the charging process. At the same time, the charging module also has over-current, over-voltage, short-circuit and other protection functions to deal with possible abnormal situations.

[0060] The effects of the above technical solutions are as follows: the energy storage lithium battery pack can directly provide the required DC power for the DCDC and dual-input ACDC / DC modules without going through additional energy conversion links, thereby reducing the loss in the energy conversion process and improving energy utilization efficiency; through the precise control of the BMS (battery management system), the charging strategy can be dynamically adjusted according to the real-time status of the battery pack (such as voltage, current, temperature, etc.) and the needs of the charging module to ensure that the battery is charged in the best condition, further improving energy utilization efficiency; the dual-input ACDC / DC module supports both AC input and DC input, which enables the system to flexibly select the charging method according to actual conditions. When AC power is unavailable, the energy storage lithium battery pack can be relied on as a DC input power source to ensure the continuous operation of the system; the energy storage lithium battery pack can also be used as a backup power source to provide power support for key equipment in emergency situations, enhancing the reliability and stability of the system; direct power supply through the energy storage lithium battery pack can reduce the number of energy conversion devices in the system, thereby simplifying the system structure and reducing system construction and maintenance costs; precise charging control and battery management help reduce battery loss and damage during the charging process, extend the service life of batteries and equipment, and further reduce long-term operating costs; as a storage and conversion device for renewable energy (such as solar energy, wind energy, etc.), the energy storage lithium battery pack, when used in conjunction with DCDC and dual-input ACDC / DC modules, can promote the widespread application of renewable energy, reduce dependence on traditional energy, and promote sustainable development; by improving energy utilization efficiency and reducing losses in the energy conversion process, this technical solution helps to reduce energy consumption and carbon emissions, and is of great significance to environmental protection and energy conservation and emission reduction.

[0061] In one embodiment of the present invention, the main controller (MCU) is used to receive instructions from the human-machine interface (HM) and control the working status of each unit according to the instructions; at the same time, monitor the operating status of the entire charging pile; the main controller integrates a 4G communication function, which is used to report data to an external cloud platform or accept external control commands; the human-machine interface (HM) is used to configure operating parameters or issue control and query commands to the main controller (MCU), or echo operating parameters and status.

[0062] The working principle of the above technical solution is as follows: MCU receives instructions from HM through the internal bus or specific interface; these instructions may include configuration operating parameters, control commands or query commands; according to the received instructions, MCU sends control signals to various units of the charging pile (such as power module, charging gun control module, display module, etc.) through the output interface; these control signals are used to adjust the working status of each unit to meet the charging needs; MCU monitors the operating status of the charging pile in real time through sensors and interfaces; the monitored data may include charging current, voltage, temperature, communication status, etc.; MCU determines whether the charging pile is operating normally based on these data, and takes protective measures when necessary; MCU integrates a 4G communication module for data transmission with an external cloud platform; MCU can report the operating status, fault information and other data of the charging pile to the cloud platform; at the same time, MCU can also receive control commands or parameter updates from the cloud platform; users can enter the operating parameters of the charging pile through the HM interface; these parameters may include charging current, Voltage range, charging time, etc.; HM converts the parameters input by the user into instructions and sends them to MCU; users can issue control commands through the HM interface, such as starting charging, stopping charging, etc.; at the same time, users can also query the current status or history of the charging pile; HM converts these commands or query requests into instructions and sends them to MCU; MCU sends the operating parameters and status data of the charging pile to HM; HM converts these data into an easy-to-understand format and displays them on the interface; users can understand the working status of the charging pile in real time through the HM interface; users input configuration parameters, issue control commands or query requests through the HM interface; HM converts user input into instructions and sends them to MCU; MCU receives the instructions and parses and processes them; adjusts the working status of each unit of the charging pile or monitors the operating status according to the instructions; reports the operating data of the charging pile to the cloud platform or sends it back to HM; HM receives the operating parameters and status data returned by MCU, and displays them on the interface for users to view; the cloud platform performs remote monitoring and management based on the data reported by MCU.

[0063] The effects of the above technical solution are as follows: the main controller (MCU) can quickly receive and parse the instructions of the human-machine interface (HM), accurately control the working status of each unit of the charging pile according to the instructions, and realize efficient and accurate charging control; the MCU can monitor the operating status of the charging pile in real time through the integrated monitoring function, including key parameters such as current, voltage, and temperature. Once an abnormality or potential fault is found, it can immediately trigger the early warning mechanism to ensure the safety and stability of the charging process; the 4G communication module integrated in the MCU enables the charging pile to transmit data with the external cloud platform in real time, realizing remote monitoring, data analysis and troubleshooting. This greatly reduces the cost and difficulty of on-site maintenance and improves the efficiency of operation and maintenance; the cloud platform can send control commands or update operating parameters to the MCU through 4G communication to realize remote configuration and control of the charging pile. This not only facilitates the flexible deployment of the charging pile, but also improves its ability to adapt to different charging needs; the human-machine interface (HM) provides a friendly user interface, allowing users to easily configure operating parameters, issue control commands or query the status of the charging pile. This greatly simplifies the charging operation and improves the user experience; HM can display the operating parameters and status of the charging pile in real time, allowing users to understand the charging progress and status of the charging pile at any time, enhancing the transparency and controllability of the charging process; MCU reports the operating data of the charging pile to the cloud platform through 4G communication, and the cloud platform can collect, analyze and mine this data, providing strong support for the optimal design, fault prediction and operation and maintenance decision-making of the charging pile; based on the big data analysis and AI algorithm of the cloud platform, intelligent scheduling, load balancing and energy optimization of the charging pile can be realized, thereby improving charging efficiency and energy utilization.

[0064] One embodiment of the present invention, as Figure 2 As shown, a circuit control method is implemented using any of the energy storage charging piles described above, and the control method includes:

[0065] S01. When the charging pile receives external power, the main controller (MCU) initializes the working status of all control units; and reads the current status information through the human-machine interface (HM), including battery status and power connection status;

[0066] S02, the main controller (MCU) detects whether there is external AC power input through the AC input switch unit (such as a three-phase distribution box, a three-phase AC charging gun, etc.);

[0067] S03. If the AC power supply is connected normally, the main controller controls whether to establish a connection with the dual-input charging module (ACDC / DC) through the AC contactor (KM1) and the intermediate relay (KA1); and monitors the working status of the AC power supply in real time through the feedback loop (such as the normally open auxiliary contact of the AC contactor KM1 is connected to the MCU);

[0068] S04, DC input switch unit (such as DC contactors K9, K10) controls whether the DC power supply is connected according to system requirements. DC contactors K9 and K10 complete the current path control of the DC charging module (DCDC) and the energy storage lithium battery pack by connecting with the intermediate relay (KA1);

[0069] S05, BMS control unit monitors the voltage and current state of the energy storage lithium battery pack, controls the switch of DC contactors K9 and K10, monitors the performance parameters such as voltage and temperature of the energy storage lithium battery pack, and estimates the charge state and health state of the energy storage lithium battery pack based on the machine learning algorithm in combination with historical data, and preliminarily charges the battery through the pre-charge unit (pre-charge relay K3 and pre-charge resistor R); the charge state of the battery is calculated by the following formula:

[0070]

[0071] in, Indicates the initial SOC value; represents the current in the i-th time interval (positive value indicates charging, negative value indicates discharging); represents the length of the i-th time interval; Indicates the rated capacity of the battery; Indicates the self-discharge rate; Indicates the total time length; and Respectively represent the temperature and current rate correction coefficients; represents the battery temperature at the i-th time interval; Indicates the reference temperature; Indicates the rated current of the battery;

[0072] The health status of the battery is calculated by the following formula:

[0073]

[0074] in, Indicates the actual battery capacity; Indicates the rated capacity of the battery; and Respectively represent the cycle life and temperature effect correction coefficient; Indicates the number of battery cycles; Indicates the rated number of cycles of the battery; Indicates the maximum battery temperature; Indicates the reference temperature;

[0075] S06. If the battery status is normal, the BMS control unit controls the battery charging process through the total positive contactor K1 and the total negative contactor K2, collects the battery status information in real time (communicates with the MCU through the CAN bus), and uploads the data to the cloud platform or displays it through the human-machine interface (HM);

[0076] S07, when the energy storage lithium battery pack has been fully charged or reaches the set voltage level, the main controller (MCU) controls the DC fast charging output switch unit (such as the charging positive contactor K7 and the charging negative contactor K8) to start;

[0077] S08, by controlling the opening and closing of contactors K8 and K7, the main controller (MCU) transfers the electric energy of the energy storage lithium battery pack to the external load (such as electric vehicles, etc.) through the DC fast charging output module;

[0078] S09. During the entire charging process, the main controller (MCU) monitors the charging process in real time, detects the charging status feedback loop, and disconnects the circuit through the corresponding safety mechanism; and optimizes the charging strategy by obtaining the charging power and charging time during the charging process; the charging power is obtained by the following formula:

[0079]

[0080] in, represents the charging power at time t; represents the charging voltage at time t; represents the charging current at time t; Indicates charging efficiency; Indicates the rated voltage of the battery; Indicates the rated current of the battery; t is the charging time; Indicates the dynamic response time constant of the battery, reflecting the battery's response speed to changes in charging current. A smaller value means the battery responds more slowly to current changes, while a smaller A value of 0 indicates a faster response; Represents the current offset, taking into account the nonlinear characteristics of the battery; represents the battery state of charge at time t; Indicates the maximum state of charge of the battery (usually 100%); It represents a nonlinear index, which is used to describe the nonlinear relationship between the current and the state of charge (SOC) during battery charging. As the SOC increases, the battery's charging acceptance will gradually decrease. The value of determines the speed and shape of this decline;

[0081] The charging time is obtained by the following formula:

[0082]

[0083] in, Indicates the charging time of the battery under rated conditions; and Indicates the charging time correction factor; Indicates the battery state of charge when charging begins; Indicates the battery state of charge at the end of charging; Indicates the ambient temperature; Indicates the optimal charging temperature of the battery; and Respectively represent the impact index of temperature and SOC changes on charging time;

[0084] S10. When the power level of the energy storage lithium battery pack is lower than the set threshold, the main controller (MCU) triggers the automatic charging function and automatically switches to the DC input or AC input power supply. If any abnormal situation occurs during the charging process (such as battery overvoltage, overcurrent or contactor adhesion, etc.), the BMS control unit and the main controller (MCU) trigger the protection mechanism, stop charging, and notify the user through the alarm system;

[0085] S11, the main controller (MCU) exchanges data with the external cloud platform through the 4G communication function, uploads relevant data such as real-time operation status and battery charging status, and receives external control commands, such as remote power on and off, remote upgrade, intelligent and orderly charging, etc.;

[0086] S12, the user uses the human-computer interaction interface and makes corresponding settings, including configuring operating parameters, querying device status, setting charging strategies, etc. When the charging process is completed or a fault occurs during the process, the main controller (MCU) automatically ends the charging according to the settings, and checks the status of all contactors through the feedback loop to ensure the normal disconnection of the contactors;

[0087] S13. All fault information (such as contactor adhesion, battery abnormality, etc.) is displayed through the human-machine interface (HM) and fed back to the operation and maintenance personnel or users through the cloud platform.

[0088] The working principle of the above technical solution is as follows: when the charging pile is connected to an external power source, the main controller (MCU) first performs initialization operations, which includes detecting the working status of each control unit (such as AC input switch unit, DC input switch unit, energy storage lithium battery pack, BMS control unit, etc.), and reading the current battery status, power connection status and other information through the human-machine interface (HM); the MCU ensures that the various systems of the charging pile are in normal working condition by detecting the connection status and working parameters of each module, and is ready for the subsequent charging process; the MCU detects whether there is external AC power input through the AC input switch unit. If the connection is normal, it is ready to charge. The equipment establishes a connection with the dual-input charging module (ACDC / DC); according to system requirements, the DC input switch unit controls the access of the DC power supply, and simultaneously completes the current path control of the DC charging module (DCDC) and the energy storage lithium battery pack; the BMS control unit monitors the voltage and current status of the energy storage lithium battery pack, and performs preliminary charging of the battery through the pre-charging unit to ensure that the battery is in a safe state before formal charging; if the battery status is normal, the BMS control unit controls the battery charging process through the total positive contactor K1 and the total negative contactor K2, and collects the battery status information in real time and uploads it to the cloud platform or displays it through the HM; when the energy storage lithium battery pack is fully charged or When the set voltage level is reached, the MCU controls the DC fast charging output switch unit to start and transfer the battery power to the external load; during the entire charging process, the MCU monitors the charging status feedback loop in real time and ensures the safety of the charging process through corresponding safety mechanisms (such as overvoltage, overcurrent protection, etc.); when the power of the energy storage lithium battery pack is lower than the set threshold, the MCU triggers the automatic power replenishment function and automatically switches to the DC input or AC input power supply for charging; if any abnormal situation occurs during the charging process (such as battery overvoltage, overcurrent, contactor adhesion, etc.), the BMS control unit and MCU will trigger the protection mechanism, stop charging, and notify the user through the alarm system; MC U exchanges data with the external cloud platform through the 4G communication function, uploads relevant data such as real-time operating status and battery charging status, and receives external control commands at the same time; the user makes corresponding settings through the HM (such as configuring operating parameters, querying equipment status, setting charging strategies, etc.), and the MCU automatically ends charging according to the user settings, and checks the status of all contactors through the feedback loop; the MCU displays all fault information (such as contactor adhesion, battery abnormality, etc.) through the HM, and feeds back to the operation and maintenance personnel or users through the cloud platform; the cloud platform can provide remote fault diagnosis and maintenance support based on the uploaded fault information, reducing on-site maintenance costs and improving operation and maintenance efficiency.

[0089] The effects of the above technical solution are as follows: after the charging pile receives external power, the main controller (MCU) can quickly initialize all control units, detect the connection and working status of each module, and ensure the safety and efficiency of the charging process; through the AC input switch unit and the DC input switch unit, the charging pile can receive AC power and DC power input at the same time, improving the charging flexibility and energy utilization efficiency; the BMS control unit can monitor the performance parameters such as voltage, current and temperature of the energy storage lithium battery pack in real time, and perform preliminary charging of the battery through the pre-charging unit to ensure that the battery is in the best condition before formal charging. At the same time, the MCU can intelligently control the charging process according to the battery status and system requirements to achieve efficient and safe charging; the MCU can monitor the charging process in real time and detect the charging status feedback loop to ensure the safety and stability of the charging process; if abnormal conditions such as battery overvoltage, overcurrent or contactor adhesion occur during the charging process, the BMS control unit and MCU can quickly trigger the protection mechanism, stop charging, and notify the user through the alarm system to effectively avoid the occurrence of safety accidents; when the power of the energy storage lithium battery pack is lower than the set threshold, the MCU can trigger the automatic power replenishment function and automatically switch to DC input or AC input power for charging to ensure the continuous power supply capacity of the charging pile; the MCU interacts with the external cloud platform through the 4G communication function and can upload the charging and discharging information in real time. The cloud platform can collect relevant data such as the operation status of the charging pile and the battery charging status, and receive external control commands such as remote power on / off and remote upgrade, so as to realize remote management and intelligent control of the charging pile; the cloud platform can formulate intelligent and orderly charging plans according to the grid load and user needs, and control the charging time and power of the charging pile through the MCU to realize effective management of the power load and improve the stability and reliability of the grid; users can easily configure operating parameters, query equipment status, set charging strategies, etc. through the human-machine interface (HM), which improves the user's convenience and satisfaction; the MCU can display all fault information through the HM and feedback it to the operation and maintenance personnel or users through the cloud platform, so as to realize the timely discovery and processing of faults and reduce the operation and maintenance costs. The formula mentioned in S05 above can more accurately estimate the SOC of the battery by considering the influence of current integral, self-discharge, temperature and current rate. This helps to avoid overcharging or over-discharging, thereby extending the service life of the battery. The introduction of temperature and current rate correction coefficients (α and β) makes the SOC estimation more adaptable to the performance of the battery under different working conditions, and improves the accuracy and reliability of the estimation. The comprehensive state of health (SOH) evaluation formula comprehensively considers the impact of battery capacity attenuation, cycle life, and temperature on battery health, and can comprehensively evaluate the battery's SOH. By introducing cycle life and temperature effect correction factors (γ and δ), the performance changes of the battery in future use can be more accurately predicted, providing a scientific basis for battery maintenance or replacement. Accurate SOC and SOH estimation provides key data support for BMS, enabling it to formulate more reasonable battery management strategies.For example, based on the real-time data of SOC and SOH, the BMS can dynamically adjust the charging and discharging strategies to balance the performance and life of the battery. Accurate SOC and SOH estimation helps to timely detect potential battery failures or safety hazards, so as to take preventive measures to avoid battery accidents. Preliminary charging of the battery through the pre-charging unit (pre-charging relay K3 and pre-charging resistor R) can reduce the impact current generated by the battery when it is connected to the system, protecting the battery and system safety. The parameters in the formula (such as the correction coefficient) can be optimized and updated through machine learning algorithms to adapt to changes in different battery types and working conditions. Combining historical data and real-time data, the BMS can realize intelligent monitoring and prediction of battery performance, providing richer information and decision support for battery management. In summary, the above formula has significant beneficial effects in the battery management system, which can improve the accuracy and reliability of battery management, optimize battery use strategies, improve system safety and reliability, and support intelligent and big data applications. The formula mentioned in S09 above can accurately calculate the charging power P(t) at any time by considering the real-time voltage V(t) and current I(t) of the battery at time t, as well as the charging efficiency η of the battery; the rated voltage and rated current of the battery, as well as the dynamic response time constant of the battery are taken into account. , making the calculation of charging power more consistent with the actual physical characteristics of the battery. The current offset and nonlinear index n are introduced to describe the nonlinear characteristics of the battery during the charging process, which improves the accuracy of the charging power calculation. The main controller (MCU) can dynamically optimize the charging strategy by obtaining the charging power and charging time in real time during the charging process to ensure that the battery is charged in a safe and efficient state. By accurately calculating the charging power, the MCU can adjust the charging current and voltage to maximize the charging efficiency and reduce battery loss. The charging time formula takes into account the initial and final state of charge of the battery, as well as the ambient temperature and the optimal charging temperature of the battery, making the calculation of the charging time more comprehensive and accurate. The charging time correction coefficients α and β, as well as the influence indexes m and o of temperature and SOC changes on the charging time are introduced to further improve the accuracy of the charging time prediction. The MCU monitors the charging process in real time, detects the charging state feedback loop, and disconnects the circuit through the corresponding safety mechanism when necessary, thereby effectively preventing safety hazards such as battery overcharging and overheating. Accurate calculation of charging power and charging time helps the MCU to more accurately judge the charging state of the battery and take timely measures to protect battery safety. By optimizing the charging strategy, unnecessary energy loss can be reduced and charging efficiency can be improved. Accurate charging time prediction helps to arrange the charging plan reasonably and avoid long waiting times or frequent interruptions of the charging process. The above formula has a significant beneficial effect in describing and optimizing the charging power and charging time during the charging process, which helps to improve the charging efficiency, safety and service life of the battery.

[0090] In one embodiment of the present invention, the charging strategy is optimized by obtaining the charging power and the charging time during the charging process, including:

[0091] The deployed sensors capture various parameters of the charging process in real time, and the collected raw data is pre-processed locally at the charging station through edge computing technology;

[0092] Based on the preprocessed data, use machine learning algorithms (such as LSTM, GRU and other recurrent neural networks) to evaluate the current state of the battery (such as SOC, SOH) in real time;

[0093] Dynamically fit the charging power curve based on the voltage and current data collected in real time, and compare it with the theoretical model (such as the P(t) formula above), identify deviations and adjust parameters;

[0094] Use historical charging data to train a time prediction model (such as random forest, XGBoost, etc.), combine the current environmental conditions and battery status, dynamically predict the charging time, and make fine adjustments based on the impact index (m and o) of temperature and SOC changes on the charging time;

[0095] Based on real-time status evaluation and prediction results, the charging strategy is dynamically adjusted, such as using different charging current and voltage strategies in different SOC intervals; the energy conversion efficiency (i.e., charging efficiency) during the charging process is calculated, and the energy loss link is identified and optimized, such as reducing line losses and optimizing charging module efficiency. The energy conversion efficiency is calculated using the following formula:

[0096]

[0097] in, Indicates the rated voltage of the battery; Indicates the rated current of the battery; Indicates the conversion efficiency of the charging module; Indicates the power loss of the charging cable; Indicates heat loss power; represents other energy losses;

[0098] Combined with factors such as electricity price fluctuations and charging demand forecasts, economic models (such as marginal cost analysis) are used to dynamically adjust the charging time window, implement intelligent scheduling strategies in the charging pile cluster, and allocate charging resources based on the load conditions, battery status, and user needs of each charging pile;

[0099] Through deep learning algorithms, charging data is monitored in real time to identify potential safety hazards such as overvoltage, overcurrent, and overheating, and issue early warnings.

[0100] Through the fault simulation system based on physical models, combined with real-time data, the cause of the fault can be quickly located. Based on the preset emergency response plan, once a serious fault is detected, the protection mechanism is immediately activated, the circuit is disconnected, and users and operation and maintenance personnel are notified through the human-computer interaction interface and cloud platform.

[0101] The working principle of the above technical solution is as follows: deploy high-precision sensors at key locations of charging piles to capture key parameters such as voltage, current, and temperature during the charging process in real time; use edge computing devices deployed locally on the charging piles to preprocess the collected raw data, including data cleaning, denoising, and outlier detection, to improve data quality and the accuracy of subsequent analysis; based on the preprocessed data, use machine learning algorithms (such as LSTM, GRU, and other recurrent neural networks) to evaluate the current state of the battery (such as SOC, SOH) in real time. These algorithms can capture dynamic changes in time series data and provide a basis for adjusting charging strategies; dynamically fit the charging power curve based on the voltage and current data collected in real time, and compare it with the theoretical model (such as the P(t) formula), identify deviations, and adjust parameters to ensure that the model closely matches the actual situation; use historical charging data to train time prediction models (such as random forests, XGBoost, etc.), and dynamically predict charging time in combination with current environmental conditions and battery status. At the same time, consider the impact index (m and o) of temperature and SOC changes on charging time, and make fine adjustments to improve the accuracy of predictions; dynamically adjust charging strategies based on real-time state evaluation and prediction results. For example, different charging current and voltage strategies are adopted in different SOC intervals to balance charging speed and battery health; the energy conversion efficiency during the charging process is calculated, and the energy loss link is identified and optimized. This includes reducing line losses, optimizing charging module efficiency, etc. to improve overall energy utilization efficiency; combining factors such as electricity price fluctuations and charging demand forecasts, and using economic models (such as marginal cost analysis) to dynamically adjust the charging time window. Implement intelligent scheduling strategies in charging pile clusters, and reasonably allocate charging resources according to the load conditions, battery status and user needs of each charging pile to reduce costs and improve user experience; use deep learning algorithms to monitor charging data in real time to identify potential safety hazards such as overvoltage, overcurrent, and overheating. Once abnormal data is detected, an early warning signal is immediately issued to remind users and operation and maintenance personnel to take corresponding measures; use a fault simulation system based on a physical model, combined with real-time data, to quickly locate the cause of the fault. This helps operation and maintenance personnel to take quick measures to troubleshoot and restore the normal operation of charging services; once a serious fault is detected, the protection mechanism is immediately activated to disconnect the circuit to prevent the fault from further expanding. At the same time, users and operation and maintenance personnel are notified through the human-computer interaction interface and the cloud platform to ensure timely transmission and response of information.

[0102] The effects of the above technical solutions are: through real-time evaluation of the current state of the battery (such as SOC, SOH) by machine learning algorithms, the actual condition of the battery can be understood more accurately, so as to formulate a more reasonable charging strategy, avoid damage to the battery caused by overcharging or over-discharging, and extend the battery life; dynamically fit the charging power curve according to the real-time collected voltage and current data, and adjust the parameters by comparing with the theoretical model, which can ensure that the charging process is more efficient and reduce energy waste, and also help maintain the health of the battery; the time prediction model trained using historical charging data can dynamically predict the charging time in combination with the current environmental conditions and battery status, thereby improving the user's charging experience. At the same time, the impact index of temperature and SOC changes on charging time is finely adjusted to further improve the accuracy of the prediction; the intelligent scheduling strategy is implemented in the charging pile cluster to allocate charging resources according to the load condition, battery status and user needs of each charging pile, which can effectively avoid the idleness or overload of charging piles and improve the overall charging efficiency; the energy conversion efficiency in the charging process is calculated, and the energy loss link is identified and optimized, such as reducing line loss and optimizing charging module efficiency, which can significantly improve energy utilization efficiency and reduce charging costs; combined with electricity price fluctuations and charging demand forecasts, the economic model is used to dynamically adjust the charging time window, which helps users to be more economical. Reasonable arrangement of charging time to reduce charging costs; real-time monitoring of charging data through deep learning algorithms, identification of potential safety hazards and early warning, and rapid location of fault causes and activation of protection mechanisms through physical model-based fault simulation systems can ensure the safety and reliability of the charging process and improve user experience; once a serious fault is detected, the protection mechanism is immediately activated and the user and operation and maintenance personnel are notified, which can quickly eliminate the fault, restore charging services, and reduce downtime and operation and maintenance costs caused by the fault; through the human-computer interaction interface and cloud platform, operation and maintenance personnel can remotely monitor the operating status of the charging pile, realize centralized management and maintenance, and improve operation and maintenance efficiency. The above formula comprehensively considers a variety of energy loss factors, including the conversion efficiency loss of the charging module, the power loss of the charging cable, the heat loss power, and other energy losses. This comprehensive consideration makes the calculation results more accurate and can more truly reflect the energy utilization efficiency during the charging process. By calculating the energy conversion efficiency, it is possible to clearly identify which links are the main sources of energy loss. This helps to guide subsequent optimization measures, such as improving the conversion efficiency of the charging module, reducing the length of the charging cable or selecting cable materials with lower loss, and optimizing the heat dissipation design to reduce heat loss. After understanding the energy conversion efficiency, targeted measures can be taken to improve it. For example, by upgrading technology or replacing more efficient charging modules, the conversion efficiency can be significantly improved; by optimizing charging strategies, such as dynamically adjusting charging current and voltage, energy loss can be reduced to a certain extent, improving overall energy utilization efficiency.Improving energy conversion efficiency means that less electricity is consumed under the same charging demand, thereby reducing carbon emissions and environmental pollution. This is of great significance for promoting the development of green energy and achieving sustainable development goals. Improving energy conversion efficiency can not only reduce users' charging costs, but also reduce the load pressure on the power grid and reduce the investment and maintenance costs of power infrastructure. At the same time, for charging pile operators, improving energy conversion efficiency also means higher operational efficiency and profitability; in summary, the above formula has brought significant beneficial effects in improving energy conversion efficiency, promoting energy conservation and emission reduction, reducing user costs, improving operational efficiency, and providing a basis for policy formulation by comprehensively considering the energy loss factors in the charging process.

[0103] 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. An energy storage charging pile capable of automatically replenishing electricity, characterized in that: The energy storage charging pile comprises: Energy storage lithium battery pack, BMS control unit, main controller, human-machine interaction interface and current switch module; the signal output end of the energy storage lithium battery pack is connected to the signal input end of the BMS control unit through a wire; the signal output end of the BMS control unit is connected to the first signal input end of the main controller through a wire; the first signal output end of the main controller is connected to the first signal input end of the current switch module through a wire; the second signal output end of the main controller is connected to the signal input end of the human-machine interaction interface through a wire; the first signal output end of the current switch module is connected to the signal input end of the BMS control unit through a wire; the second signal output end of the current switch module is connected to the second signal input end of the main controller through a wire; the third signal output end of the current switch module is connected to the third signal input end of the main controller through a wire; the fourth signal output and input ends of the main controller are bidirectionally connected to the fourth signal output and input ends of the current switch module respectively.

2. According to claim 1, an energy storage charging pile capable of automatically replenishing electricity is characterized in that: The current switch module includes an AC input switch unit, a DC input switch unit, a DC fast charging output switch unit and a rectifier negative contactor. The signal output end of the DC input unit is also the first signal output end and the second signal output end of the current switch module; the signal output end of the AC input unit and the third signal output end of the current switch module; the signal input end of the rectifier negative contactor is also the first signal input end of the current switch module; the signal output input end of the DC fast charging output switch unit is also the fourth signal output input end of the current switch module.

3. According to claim 2, an energy storage charging pile capable of automatically replenishing electricity is characterized in that: The AC input switch unit includes a three-phase distribution box, a three-phase AC charging gun, a charging seat, an AC contactor, an intermediate relay, a main controller, a dual-input charging module and a wire. The plug of the three-phase AC charging gun is connected to the socket of the charging seat, and the other end, i.e., its power line, is connected to the three-phase distribution box, while the other end, i.e., the power line, of the charging seat is connected to the input end of the AC contactor, and constitutes an AC input connection detection and control circuit; the output end of the AC contactor is connected to the dual-input charging module, wherein the wire L3 of the distribution box is connected via the DC+ phase of the vehicle plug, the three-phase AC charging gun, the AC contactor and the dual-input charging module. Connection, the wire L2 of the distribution box is connected via the three-phase AC charging gun, the charging seat, the AC contactor and the DC- phase of the dual-input charging module, forming the AC and DC input circuit and the public connection relationship of the dual-input charging module; one end of the AC contactor control coil is connected to the 24V- power supply, and the other end is connected to the common contact 5 of the intermediate relay via the emergency stop normally closed contact, and is connected to the main controller via the normally closed contact 1 of the intermediate relay, forming the control circuit of the AC contactor; one end of the normally open auxiliary contact of the AC contactor is connected to the main controller, and the other end is connected to the 12V+ power supply, forming a feedback loop of the AC contactor.

4. The energy storage charging pile capable of automatically replenishing electricity according to claim 2, characterized in that: The DC input switch unit includes a DC contactor, an intermediate relay, a main controller, a DC input charging module and a wire. The control coils of the DC contactors K9 and K10 are connected in parallel, one end of which is connected to the intermediate relay control coil connection point 8 and the 24V-power supply, and the other end is connected to the intermediate relay control coil connection point 7, and is connected to the main controller via the normally closed auxiliary contact of the AC contactor, forming a control circuit of the DC contactors K9 and K10 and a mutually exclusive circuit with the AC contactor; the normally open auxiliary contact of the DC contactors K9 and K10 The two terminals are connected in parallel, one end of which is connected to the 12V+ power supply, and the other end is connected to the main controller, forming a feedback loop of the total state of the DC contactors K9 and K10. Any adhesion of any contactor can be detected by the main controller; the dual-input charging module in the AC input switch unit and the DC input charging module in this DC input switch unit, the DC+ and DC- at their input ends are connected in series via DC contactors K9 and K10, respectively, wherein the DC+ and DC- of the DC input charging module are respectively connected to the total positive and total negative of the energy storage lithium battery pack controlled by the BMS control unit.

5. The energy storage charging pile capable of automatically replenishing electricity according to claim 2, characterized in that: The DC fast charging output switch unit includes a charging positive contactor, a charging negative contactor, a charging gun and a wire, wherein the input ends of the charging positive contactor and the charging negative contactor are respectively connected to the output positive and output negative of the DC input charging module and the dual-input charging module, and the charging negative contactor is connected in series with the rectifier negative contactor to the total negative of the energy storage lithium battery pack, and the charging positive contactor is connected in series with the rectifier positive contactor to the total positive of the energy storage lithium battery pack; the control coils of the charging positive contactor and the charging negative contactor are connected in parallel, one end of the parallel connection is connected to the main controller, and the other end is connected to the 24-power supply, forming a parallel control of the charging positive contactor and the charging negative contactor; the normally open auxiliary contacts of the charging positive contactor and the charging negative contactor are connected in parallel, one end of the parallel connection is connected to the 12V+ power supply, and the other end is connected to the main controller, forming a feedback loop of the total state of the charging positive contactor and the charging negative contactor, and any adhesion of the contactor can be detected by the main controller.

6. According to claim 2, an energy storage charging pile capable of automatically replenishing electricity is characterized in that: The rectifier negative contactor is used to close the negative terminal contactor when the energy storage lithium battery pack is replenished.

7. The energy storage charging pile capable of automatically replenishing power according to claim 1, characterized in that: The BMS control unit includes a pre-charging unit, a total positive contactor, a rectifier positive contactor, a total negative contactor, a BMS and a wire; the pre-charging unit includes a pre-charging relay, a pre-charging resistor and a wire; one end of the pre-charging relay and the total positive contactor are commonly connected to the total positive phase of the energy storage lithium battery pack, and the other end of the pre-charging relay is connected in series with the pre-charging resistor and then connected to the other end of the total positive contactor, forming a control loop of the pre-charging unit; one end of the rectifier positive contactor is connected to the total positive phase of the energy storage lithium battery pack, and the other end is connected to the output positive phase of the DC input charging module and the dual-input charging module; the other ends of the total positive contactor and the total negative contactor are respectively connected to the output positive and output negative phases of the DC input charging module in the DC fast charging output switch unit, the acquisition end of the BMS is connected to the energy storage lithium battery pack, and its CAN communication end is connected to the main controller; the pre-charging relay, the total positive contactor, the rectifier positive contactor, and the total negative contactor are all controlled by the BMS.

8. The energy storage charging pile capable of automatically replenishing electricity according to claim 1, characterized in that: The energy storage lithium battery pack is used to provide a DC input power source for the DC input charging module and the dual-input charging module.

9. The energy storage charging pile capable of automatically replenishing power according to claim 1, characterized in that: The main controller is used to receive instructions from the human-computer interaction interface and control the working status of each unit according to the instructions; at the same time, it monitors the operating status of the entire charging pile; the main controller integrates 4G communication function, which is used to report data to the external cloud platform or accept external control commands; the human-computer interaction interface is used to configure operating parameters to the main controller or issue control and query commands, or echo operating parameters and status.

10. A circuit control method, implemented using the energy storage charging pile according to any one of claims 1 to 9, characterized in that: The control method comprises: When the charging pile receives external power, the main controller initializes the working status of all control units and reads the current status information through the human-computer interaction interface; The main controller detects whether there is external AC power input through the AC input switch unit; If the AC power supply is connected normally, the main controller controls whether to establish a connection with the dual-input charging module through the AC contactor and the intermediate relay; and monitors the working status of the AC power supply in real time through the feedback loop; The DC input switch unit controls whether the DC power supply is connected according to system requirements. The DC contactors K9 and K10 complete the current path control of the DC charging module and the energy storage lithium battery pack by connecting with the intermediate relay; The BMS control unit monitors the voltage and current status of the energy storage lithium battery pack, controls the switches of DC contactors K9 and K10, monitors the performance parameters of the energy storage lithium battery pack, and performs preliminary charging of the battery through the pre-charging unit; If the battery status is normal, the BMS control unit controls the battery charging process through the total positive contactor K1 and the total negative contactor K2, collects the battery status information in real time, and uploads the data to the cloud platform or displays it through the human-computer interaction interface; When the energy storage lithium battery pack has been fully charged or reaches the set voltage level, the main controller controls the DC fast charging output switch unit to start; By controlling the opening and closing of contactors K8 and K7, the main controller transfers the electric energy of the energy storage lithium battery pack to the external load through the DC fast charging output module; During the entire charging process, the main controller monitors the charging process in real time, detects the charging status feedback loop, and disconnects the circuit through the corresponding safety mechanism; When the power level of the energy storage lithium battery pack is lower than the set threshold, the main controller triggers the automatic charging function and automatically switches to DC input or AC input power. If any abnormal situation occurs during the charging process, the BMS control unit and the main controller trigger the protection mechanism, stop charging, and notify the user through the alarm system; The main controller exchanges data with the external cloud platform through the 4G communication function, uploads relevant data, and receives external control commands; The user uses the human-machine interface and makes corresponding settings. When the charging process is completed or a fault occurs during the charging process, the main controller automatically ends the charging according to the settings and checks the status of all contactors through the feedback loop to ensure the normal disconnection of the contactors. All fault information is displayed through the human-computer interaction interface and fed back to operation and maintenance personnel or users through the cloud platform.

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