Backup power supply remote charging and discharging device suitable for natural gas station

Abstract

The utility model discloses a backup power supply remote charging and discharging device suitable for a natural gas station, which comprises a display and control module, a power supply module and a charging and discharging control module, and is characterized in that the display and control module is used for receiving a remote instruction sent by a remote platform, generating a charging and discharging signal and monitoring the state and operation data of a backup power supply; the charging and discharging control module is connected with the display and control module and is used for executing a charging and discharging instruction sent by the display and control module; the charging and discharging control module is connected with the input of the back-up power supply and is used for cutting off or closing the input of the back-up power supply; and the power supply module is used for supplying power to the display and control module and the charge and discharge control module. According to the utility model, the remote charging and discharging control management efficiency of the backup power supply can be improved, the planned charging and discharging test of the backup power supply can be realized, and the data can be remotely transmitted to a station control system by monitoring the voltage, current, temperature, internal resistance and the like of the storage battery in real time, thereby realizing the data abnormity alarm function.

Description

Technical Field

[0001] The utility model relates to the technical field of power systems, and in particular to a remote charging and discharging device for a backup power supply suitable for a natural gas station. Background Art

[0002] In recent years, as gas mines have continuously promoted digital gas field construction, the use of automated instrumentation and electrical equipment has continued to increase. These equipment has enabled data collection, security monitoring, and automated control of key valves, laying the foundation for advancing central station management. Furthermore, the proper operation of backup power supplies is essential for ensuring safe and stable production at stations, so ensuring their proper and stable operation is crucial.

[0003] Backup power supplies are distributed in many locations and over a wide area. Currently, they can only be manually charged and discharged on-site on a regular basis. However, due to inconsistent skill levels of operation and maintenance personnel, inconsistent charging and discharging cut-off conditions, inconvenient operation at unmanned stations, and uncertainty in manual operation, the batteries cannot be effectively maintained and the smooth operation of the backup power supply cannot be guaranteed.

[0004] There are also backup power supply remote charging and discharging devices in the existing technology, such as: 202110285500.4, 201310201343.X, 202010806277.9, etc., but their structure is complex, the cost is too high, and it is impossible to evaluate the quality of the battery before discharge. If the battery is discharged during a fault, it will cause the user's actual load to lose power, causing a power outage accident. Summary of the Invention

[0005] The purpose of this utility model is to overcome the aforementioned problems of the prior art and provide a remote backup power supply charging and discharging device suitable for natural gas stations. This device improves the efficiency of remote backup power supply charging and discharging control and management, enables planned backup power supply charging and discharging testing, and remotely transmits data to the station control system through real-time monitoring of battery voltage, current, temperature, internal resistance, and other parameters, providing an alarm for abnormal data.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A remote charging and discharging device for a backup power supply suitable for a natural gas station is characterized by comprising a display and control module, a power module and a charging and discharging control module, wherein the display and control module is used to receive remote instructions sent by a remote platform, generate charging and discharging signals and monitor the status and operating data of the backup power supply; the charging and discharging control module is connected to the display and control module and is used to execute the charging and discharging instructions issued by the display and control module; the charging and discharging control module is connected to the input of the backup power supply and is used to cut off or close the input of the backup power supply; and the power module is used to supply power to the display and control module and the charging and discharging control module.

[0008] The charge and discharge control module includes an RK-AB mains battery sampling unit and a KM relay module. The RK-AB mains battery sampling unit is used to sample the mains input voltage and the backup power battery pack voltage in real time. When receiving the charge or discharge instruction issued by the display and control module, it controls the opening and closing of the KM relay module to charge and discharge the backup power supply.

[0009] The KM relay module is used to connect or disconnect the backup power input and includes three normally closed relays. The coils of the three normally closed relays are connected in parallel to form two contacts, which are respectively connected to the power module and the RK-AB mains battery sampling unit.

[0010] The three normally closed relays are KM1, KM2 and KM3. The coils of KM1, KM2 and KM3 are connected in parallel to form two coil contacts KMXB1 and KMXB2, among which KMXB1 is connected to the power module 24V+, and KMXB2 is connected to the RK-AB mains battery sampling unit JP10-1; one end KM1-1, KM2-1 and KM3-1 of the normally closed contacts of KM1, KM2 and KM3 are respectively connected to the external mains input voltage terminals A\B\C on the charge and discharge control module, and the other end KM1-2, KM2-2 and KM3-2 are respectively connected to the external backup power input terminals U\V\W on the charge and discharge control module.

[0011] The RK-AB mains battery sampling unit includes a sampling single-chip microcomputer STC5A60S2, an AC sampling transformer T1\T2\T3, a signal conversion chip ATT7028A, an analog switch CD4067, a communication chip MAX485, a DC\DC power supply module and a K1 micro DC relay; the sampling single-chip microcomputer STC5A60S2 is connected to the communication data input end of the MAX485 chip for external data transmission and exchange, and is connected to the SPI communication port of the ATT7028A chip for data exchange between the ATT7028A and the STC5A60S2; the sampling single-chip microcomputer STC5A60 S2 is connected to the AC secondary of the AC sampling transformer T1\T2\T3 for access to the AC power supply input by the mains; the sampling microcontroller STC5A60S2 is connected to the DC\DC power supply module, and the DC\DC power supply module uses the converted voltage as the working power supply of the sampling microcontroller STC5A60S2; the sampling microcontroller STC5A60S2 is connected to the analog switch CD4067, and the analog switch CD4067 converts the sampled voltage signal into a digital signal and transmits it to the sampling microcontroller STC5A60S2; the sampling microcontroller STC5A60S2 is connected to the K1 micro DC relay for controlling the action of the KM relay module.

[0012] The JP3 pin on the RK-AB mains battery sampling unit is the working power input and communication interface, where JP3-1\2\3 are respectively connected to the G\24V+, G\24V- and power module output of the power module, and are used to obtain the DC 24V power output of the power module for normal operation of the RK-AB mains battery sampling unit; JP3-4\5 is connected to COM2 of the display and control module for communication between the RK-AB mains battery sampling unit and the display and control module; the other end of JP3-2 and 3 pins is connected to the input port of the DC\DC power module, and the two output pins VCC+ and GND of the DC\DC power module are respectively connected to the P41 and P17 pins of the sampling microcontroller STC5A60S2 The DC\DC power supply module converts 24V to 5V as the working power supply of the sampling microcontroller STC5A60S2; Pins 4 and 5 of JP3 are the communication data exchange ports of the RK-AB mains battery sampling unit, which are used to receive instructions from the display and control module and feedback the operation data of the RK-AB mains battery sampling unit. Pins 4 and 5 of JP3 are respectively connected to the RS485A and RS485B pins of the communication chip MAX485 communication data output. The communication data input of the communication chip MAX485 is provided by the TTL level signal of the P30\P37\P3 pins of the sampling microcontroller STC5A60S2. P30\P37\P31 correspond to the RX\EN\TX of the TTL level signal respectively.

[0013] The JP11 pin on the RK-AB mains battery sampling unit is the acquisition port for collecting the backup power battery pack voltage. The positive and negative poles of the battery pack are connected to the IO_8 and IO_COM pins of the analog switch CD4067 through pins 1 and 2 of the JP11 port, respectively, as the sampling input ends of the analog switch CD4067. The A\C\B\D pins of the analog switch CD4067 are connected to the P53\P43\P47\P32 pins of the sampling microcontroller STC5A60S2. The analog switch CD4067 converts the sampled voltage signal into a digital signal and transmits it to the sampling microcontroller STC5A60S2.

[0014] The JP10 pin on the RK-AB mains battery sampling unit is the passive node output port of the sampling unit, which is used to control the action of the KM relay module. The KMXB-2 point is connected to one end of the normally open contact K1-1 of the K1 micro DC relay through JP10-1, and the other end of K1-1 is connected to the power module 24V- through JP10-2. The sampling microcontroller STC5A60S2 controls whether the coil of the K1 micro DC relay is energized to control whether the normally open contact of K1-1 is activated.

[0015] The JP8 port on the RK-AB mains battery sampling unit is used to access the mains input AC power supply. Pins 1-4 of JP8 are sampling terminals of the external mains input voltage terminals A\B\C\N, respectively. The mains input voltage terminals A\B\C\N are connected to the T1\T2\T3 transformers through the JP8 port, A\B\C are connected to pin 1 of the T1\T2\T3 transformers in sequence, and N is connected to pin 2 of the T1\T2\T3 transformers respectively. Pin 3 of T1\T2\T3 is connected to P3\P6\P9 of ATT7028A respectively, and pin 4 is connected to P4\P7\P10 of ATT7028A in sequence. The DOUT\DIN_I\SCLK_I\SPI-CS pins of ATT7028A are connected to P33\P34\P35\P46 pins of the sampling microcontroller STC5A60S2 in sequence.

[0016] The power module includes fuse FU1, fuse FU2, power module M1 and power module M2. FU1 is connected to M1 as the input fuse of M1, and FU2 is connected to M2 as the input fuse of M2. M1 and M2 are used to convert 220VAC to 24VDC. The outputs of M1 and M2 are connected in parallel to form redundant output, wherein 24V+ is respectively connected to JP3-2 of the RK-AB mains battery sampling unit, 24V+ of the display and control module, and KMXB-1 port of the KM relay module, and 24V- is respectively connected to JP3-3 and JP10-2 of the RK-AB mains battery sampling unit and the 24V- port of the display and control module.

[0017] The display and control module includes a display screen, three RS485 communication ports COM1-3 and a working power supply interface, wherein COM1 is used for connecting to the battery BMS system of the external backup power supply, and is used to collect the data and status of the battery pack in real time; COM2 is used for connecting to JP3-4 and JP3-5 of the RK-AB mains battery sampling unit, and is used to obtain the mains input voltage and battery pack voltage data in real time, and at the same time send the execution instructions of starting and stopping discharge to the RK-AB mains battery sampling unit; COM3 is used for connecting to an external remote data reading and control device for remote data acquisition and control functions; the working power supply interface is 24VDC, which is connected by the 24V output of the power module.

[0018] The advantages of adopting the utility model are:

[0019] First, this utility model fully monitors backup battery data and incorporates the battery's health status into conditional judgment, minimizing power outages. In practical applications, it can also be combined with a backup power supply (UPS) with a bypass input to control the rectifier input and ensure that the bypass input is normal, thereby preventing power outages during the test of the load.

[0020] Second, this utility model enables remote charging and discharging of backup power supplies. Compared to previous on-site manual operations, this utility model can batch-control remote charging and discharging of backup power supplies through the station control system, greatly reducing the labor and travel costs of charging and discharging at unmanned stations. It is expected to save 1.11 million yuan / year in production costs and greatly improve the efficiency of charging and discharging at the station. At the same time, the standardized operation of the device reduces the skill requirements for operators and the probability of abnormal well shut-in events. At the same time, through the system's automatic identification, judgment, and protection, efficient and timely charging and discharging tests are carried out, greatly improving the reliability and stability of the backup power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the overall structural diagram of the utility model;

[0022] Figure 2 This is a schematic diagram of the charge and discharge control module in the utility model;

[0023] Figure 3 This is a schematic diagram of the display and control module in the device of the utility model;

[0024] Figure 4 It is a schematic diagram of the power supply module in the device of the utility model;

[0025] Figure 5 This is the circuit schematic of the RK-AB mains battery sampling unit. DETAILED DESCRIPTION

[0026] This embodiment further illustrates the present invention with reference to the accompanying drawings. Figure 1-5 As shown:

[0027] A remote charging and discharging device for a backup power supply suitable for a natural gas station includes a display and control module, a power module, and a charging and discharging control module. The display and control module is used to receive remote instructions sent by a remote platform, generate charging and discharging signals, and monitor the status and operating data of the backup power supply; the charging and discharging control module is used to execute the charging and discharging instructions issued by the display and control module; the charging and discharging control module is connected to the input of the backup power supply and is used to cut off or close the input of the backup power supply; and the power module is used to supply power to the display and control module and the charging and discharging control module.

[0028] The charge-discharge control module is equipped with an RK-AB mains battery sampling unit and three JQX-62FS-1Z normally closed relays with a DC operating voltage of 24V. The RK-AB mains battery sampling unit samples the mains input voltage and the backup power supply battery pack voltage in real time. Upon receiving a charge or discharge command from the display and control module, it controls the KM relay module to open and close, enabling the backup power supply to charge or discharge.

[0029] The RK-AB mains battery sampling unit (hereinafter referred to as the sampling unit) is a sampling unit with the sampling microcontroller STC5A60S2 (a high-performance microcontroller based on the enhanced 8051 core, hereinafter referred to as the STC microcontroller) as the core, as well as AC sampling transformers T1\T2\T3 (which samples the AC voltage and provides data for the ATT7028A chip), signal conversion chip ATT7028A (a dedicated chip that converts analog voltage signals into SPI communication bus after DSP processing), analog switch CD4067 (a 16-select-1 analog switch integrated IC), communication chip MAX485 (an RS485 communication chip with over-temperature protection function), DC\DC power supply module, K1 micro DC relay and other components. JP3 is the power input (pins 1, 2, and 3) and the communication interface (pins 4 and 5). JP3-1, 2, and 3 connect to the G, 24V+, and 24V- pins of the power module, respectively, to receive the 24V DC power from the module and power the RK-AB AC battery sampling unit. JP3-4 and 5 connect to COM2 of the display and control module, enabling communication between the RK-AB AC battery sampling unit and the display and control module. The other ends of JP3-2 and 3 connect to the input of the onboard DC / DC power module, which converts 24V to 5V for the STC microcontroller. The DC / DC power module outputs two pins: VCC+ (5V+) and GND (5V-), which connect to pins P41 and P17 of the STC microcontroller, respectively. Pins 4 and 5 of JP3 are the communication data exchange port for the sampling unit. They receive commands from the display and control module and provide operational data. Pins 4 and 5 of JP3 are designated as RS485A and RS485B, respectively, and connect to the RS485A and RS485B outputs of the MAX485 chip. The MAX485 chip's communication data inputs are provided by TTL-level signals from pins P30, P37, and P3 of the STC microcontroller. Pins P30, P37, and P31 correspond to TTL-level signals RX, EN, and TX, respectively. JP11 is the port for collecting the backup battery voltage. The maximum sampled voltage must not exceed 300V. The positive and negative terminals of the battery pack are connected to pins IO_8 and IO_COM of the CD4067 via pins 1 and 2 of JP11, respectively, serving as the sampling inputs of the CD4067. CD4067 converts the sampled voltage signal into a digital signal and connects it to the P53, P43, P47, and P32 pins of the STC microcontroller through the A, C, B, and D pins of CD4067.JP10 is the passive node output port of the sampling unit, used to control the operation of the KM relay module. 211+ (24+) is connected to KMXB-1. KMXB-2 is connected to one end of the onboard micro-relay K1-1 via JP10-1. The other end of K1-1 is connected to 211- (24-) via JP10-2. Whether K1-1's normally open contact operates is controlled by whether K1's coil is energized. This is in turn controlled by pin P42 of the STC microcontroller. Ultimately, the STC microcontroller controls the operation of the external KM relay module.

[0030] JP8 is used to connect to the AC mains input power supply, which can accept three-phase or single-phase AC voltages. Pins 1-4 of JP8 are the sampling terminals for the external AC mains input power supply terminals A, B, C, and N, respectively. The device's "external AC mains input power supply" terminals are connected to the T1, T2, and T3 transformers via JP8. Pins A, B, and C are connected to pin 1 of the T1, T2, and T3 transformers, respectively, and pins N are connected to pin 2 of the T1, T2, and T3 transformers, respectively. Pins 3 of T1, T2, and T3 are connected to pins P3, P6, and P9 of the ATT7028A, respectively, and pins 4 are connected to pins P4, P7, and P10, respectively. The DOUT, DIN_I, SCLK_I, and SPI-CS pins of the ATT7028A are connected to pins P33, P34, P35, and P46 of the STC microcontroller, respectively.

[0031] The JQX-62FS-1Z normally closed relay is used to connect or disconnect the backup power input. The coils of the three relays are connected in parallel for synchronous operation, forming two contacts, KMXB1 and KMXB2. KMXB1 is connected to the 24V+ terminal of the power module, and KMXB2 is connected to the RK-AB mains battery sampling unit JP10-1. KM1-1, KM2-1, and KM3-1 of the KM relay module are connected to the A, B, and C terminals of the device, respectively. KM1-2, KM2-2, and KM3-2 are connected to the U, V, and W terminals of the device's external backup power input, respectively.

[0032] The power module is equipped with two fuses (FU1 and FU2) and two 220VAC to 24VDC power modules (M1 and M2). FU1 serves as the input fuse for M1, and FU2 as the input fuse for M2. Both modules protect the system from tripping the front stage due to internal faults in the M1 or M2 power modules. Both M1 and M2 are 24V1A power modules, primarily converting 220VAC to 24VDC. The outputs of M1 and M2 are connected in parallel to provide redundant outputs. The 24V+ terminal is connected to JP3-2 of the RK-AB mains battery sampling unit, the 24V+ terminal of the display and control module, and the KMXB-1 terminal of the KM relay module. The 24V- terminal is connected to JP3-3 and JP10-2 of the RK-AB mains battery sampling unit, and the 24V- terminal of the display and control module.

[0033] The display and control module is equipped with three RS485 communication ports and one working power interface. COM1 is used to connect to the battery backup power supply's BMS system, collecting real-time battery pack data and status. COM2 is used to connect to JP3-4 and JP3-5 of the RK-AB mains battery sampling unit, acquiring real-time data such as mains input voltage and battery pack voltage, while also issuing discharge start and stop instructions to the RK-AB mains battery sampling unit. COM3 is used to connect to an external remote data reading and control device for remote data acquisition and control functions. The working power interface is 24VDC and is connected to the 24V output of the power module.

[0034] Function Overview:

[0035] The RK-AB mains battery sampling unit collects mains input voltage and battery pack voltage data in real time. Through the RS485 interface, it can remotely transmit the collected data and receive discharge start and stop instructions from the display and control module. It has a built-in micro relay that can control the action of the KM relay module and execute charge and discharge instructions.

[0036] The display and control module provides feedback on system operating status, operating data, and battery BMS data via the remote data reading and control port (COM3). It obtains data such as individual battery temperature, voltage, internal resistance, and battery pack current via the battery BMS communication port (COM1). It also obtains data such as mains input voltage and battery pack voltage via the RK-AB mains battery sampling unit communication port (COM2), and issues discharge start and stop commands. The display and control module features remote time calibration, internal parameter configuration, power-off saving, and remote communication port communication parameter setting. It includes a parameter configuration interface that includes information such as AC input type (three-phase or single-phase), whether an external BMS system is connected, maximum discharge time (1-300 minutes), individual battery voltage threshold, individual battery internal resistance threshold, individual battery temperature threshold, and a device identification code (a 4-digit number randomly generated upon each power-up). A record query interface is provided for querying the device's operating and alarm records. A basic data setting interface also includes information such as time and communication port data.

[0037] Working principle:

[0038] During operation, this device collects real-time data from the battery BMS (e.g., individual battery voltage, internal resistance, temperature, and battery pack current), backup power supply battery pack voltage, and backup power supply input voltage. This data is displayed locally, alarms are generated and recorded for data exceeding thresholds, and BMS data and the device's operating status are transmitted remotely via a host computer port, enabling remote real-time monitoring. During normal operation, the device's KM relay module contacts are normally closed, connecting the AC mains input and output, allowing the backup power supply system to receive mains power. The device's remote data logger status is set to "normal operation." Upon receiving a remote discharge command, the KM relay module is controlled to open, disconnecting the AC mains input and output, shutting down the backup power supply system input and transitioning the battery pack from float charge to discharge. A built-in timer in the RK-AB mains battery sampling unit limits the discharge time to a maximum of six hours. This prevents over-discharge of the battery due to communication failures after discharge begins, thus maximizing the normal operation of the backup power supply system.

[0039] Conditions for starting discharge:

[0040] Two conditions must be met for this device to start normal discharge: 1. Receive a remote command to start discharge, and its communication data must contain two required data: "device identification code" and "start discharge"; 2. Meet normal discharge conditions (normal battery voltage, normal internal resistance, normal temperature, and normal battery pack voltage). If any indicator is abnormal, a local alarm and record will be issued, and the corresponding indicator item position will be set to "abnormal" in the remote communication data.

[0041] Action conditions for stopping discharge:

[0042] This device has five conditions for stopping discharge. If any one of these conditions is met, discharge will be stopped: 1. The voltage of a single battery exceeds the threshold (if no external BMS is connected, the condition is invalid); 2. The temperature of a single battery exceeds the threshold (if no external BMS is connected, the condition is invalid); 3. The voltage of the battery pack exceeds the threshold; 4. The discharge time reaches the preset value; 5. A stop-discharge instruction is received (the stop-discharge instruction data must include two required data: "device identification code" and "stop discharge").

Claims

1. A remote charging and discharging device for a backup power supply suitable for a natural gas station, characterized by: It includes a display and control module, a power module and a charge and discharge control module. The display and control module is used to receive remote commands sent by the remote platform, generate charge and discharge signals and monitor the status and operating data of the backup power supply; the charge and discharge control module is connected to the display and control module and is used to execute the charge and discharge commands issued by the display and control module; the charge and discharge control module is connected to the input of the backup power supply and is used to cut off or close the input of the backup power supply; The power module is used to supply power to the display and control module and the charge and discharge control module.

2. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 1 is characterized in that: The charge and discharge control module includes an RK-AB mains battery sampling unit and a KM relay module. The RK-AB mains battery sampling unit is used to sample the mains input voltage and the backup power battery pack voltage in real time. When receiving the charge or discharge instruction issued by the display and control module, it controls the opening and closing of the KM relay module to charge and discharge the backup power supply.

3. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 2, characterized in that: The KM relay module is used to connect or disconnect the backup power input and includes three normally closed relays. The coils of the three normally closed relays are connected in parallel to form two contacts, which are respectively connected to the power module and the RK-AB mains battery sampling unit.

4. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 3 is characterized in that: The three normally closed relays are KM1, KM2 and KM3. The coils of KM1, KM2 and KM3 are connected in parallel to form two coil contacts KMXB1 and KMXB2, among which KMXB1 is connected to the power module 24V+, and KMXB2 is connected to the RK-AB mains battery sampling unit JP10-1; one end KM1-1, KM2-1 and KM3-1 of the normally closed contacts of KM1, KM2 and KM3 are respectively connected to the external mains input voltage terminals A\B\C on the charge and discharge control module, and the other end KM1-2, KM2-2 and KM3-2 are respectively connected to the external backup power input terminals U\V\W on the charge and discharge control module.

5. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 4 is characterized in that: The RK-AB mains battery sampling unit includes a sampling single-chip microcomputer STC5A60S2, an AC sampling transformer T1\T2\T3, a signal conversion chip ATT7028A, an analog switch CD4067, a communication chip MAX485, a DC\DC power supply module and a K1 micro DC relay; the sampling single-chip microcomputer STC5A60S2 is connected to the communication data input end of the MAX485 chip for external data transmission and exchange, and is connected to the SPI communication port of the ATT7028A chip for data exchange between the ATT7028A and the STC5A60S2; the sampling single-chip microcomputer STC5A60 S2 is connected to the AC secondary of the AC sampling transformer T1\T2\T3 for access to the AC power supply input by the mains; the sampling microcontroller STC5A60S2 is connected to the DC\DC power supply module, and the DC\DC power supply module uses the converted voltage as the working power supply of the sampling microcontroller STC5A60S2; the sampling microcontroller STC5A60S2 is connected to the analog switch CD4067, and the analog switch CD4067 converts the sampled voltage signal into a digital signal and transmits it to the sampling microcontroller STC5A60S2; the sampling microcontroller STC5A60S2 is connected to the K1 micro DC relay for controlling the action of the KM relay module.

6. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 5, characterized in that: The JP3 pin on the RK-AB mains battery sampling unit is the working power input and communication interface, where JP3-1\2\3 are respectively connected to the G\24V+, G\24V- and power module output of the power module, and are used to obtain the DC 24V power output of the power module for normal operation of the RK-AB mains battery sampling unit; JP3-4\5 is connected to COM2 of the display and control module for communication between the RK-AB mains battery sampling unit and the display and control module; the other end of JP3-2 and 3 pins is connected to the input port of the DC\DC power module, and the two output pins VCC+ and GND of the DC\DC power module are respectively connected to the P41 and P17 pins of the sampling microcontroller STC5A60S2 The DC\DC power supply module converts 24V to 5V as the working power supply of the sampling microcontroller STC5A60S2; Pins 4 and 5 of JP3 are the communication data exchange ports of the RK-AB mains battery sampling unit, which are used to receive instructions from the display and control module and feedback the operation data of the RK-AB mains battery sampling unit. Pins 4 and 5 of JP3 are respectively connected to the RS485A and RS485B pins of the communication chip MAX485 communication data output. The communication data input of the communication chip MAX485 is provided by the TTL level signal of the P30\P37\P3 pins of the sampling microcontroller STC5A60S2. P30\P37\P31 correspond to the RX\EN\TX of the TTL level signal respectively.

7. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 6, characterized in that: The JP11 pin on the RK-AB mains battery sampling unit is the acquisition port for collecting the backup power battery pack voltage. The positive and negative poles of the battery pack are connected to the IO_8 and IO_COM pins of the analog switch CD4067 through pins 1 and 2 of the JP11 port, respectively, as the sampling input ends of the analog switch CD4067. The A\C\B\D pins of the analog switch CD4067 are connected to the P53\P43\P47\P32 pins of the sampling microcontroller STC5A60S2. The analog switch CD4067 converts the sampled voltage signal into a digital signal and transmits it to the sampling microcontroller STC5A60S2.

8. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 7, characterized in that: The JP10 pin on the RK-AB mains battery sampling unit is the passive node output port of the sampling unit, which is used to control the action of the KM relay module. The KMXB-2 point is connected to one end of the normally open contact K1-1 of the K1 micro DC relay through JP10-1, and the other end of K1-1 is connected to the power module 24- through JP10-2. The sampling microcontroller STC5A60S2 controls whether the coil of the K1 micro DC relay is energized to control whether the normally open contact of K1-1 is activated.

9. The remote charging and discharging device for a backup power supply suitable for a natural gas station according to claim 8, characterized in that: The JP8 port on the RK-AB mains battery sampling unit is used to access the mains input AC power supply. Pins 1-4 of JP8 are sampling terminals of the external mains input voltage terminals A\B\C\N, respectively. The mains input voltage terminals A\B\C\N are connected to the T1\T2\T3 transformers through the JP8 port, A\B\C are connected to pin 1 of the T1\T2\T3 transformers in sequence, and N is connected to pin 2 of the T1\T2\T3 transformers respectively. Pin 3 of T1\T2\T3 is connected to P3\P6\P9 of ATT7028A respectively, and pin 4 is connected to P4\P7\P10 of ATT7028A in sequence. The DOUT\DIN_I\SCLK_I\SPI-CS pins of ATT7028A are connected to P33\P34\P35\P46 pins of the sampling microcontroller STC5A60S2 in sequence.

10. A remote charging and discharging device for a backup power supply suitable for a natural gas station according to any one of claims 1 to 9, characterized in that: The power module includes fuse FU1, fuse FU2, power module M1 and power module M2. FU1 is connected to M1 as the input fuse of M1, and FU2 is connected to M2 as the input fuse of M2. M1 and M2 are used to convert 220VAC to 24VDC. The outputs of M1 and M2 are connected in parallel to form redundant output, wherein 24V+ is respectively connected to JP3-2 of the RK-AB mains battery sampling unit, 24V+ of the display and control module, and KMXB-1 port of the KM relay module, and 24V- is respectively connected to JP3-3 and JP10-2 of the RK-AB mains battery sampling unit and the 24V- port of the display and control module.

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