Novel intelligent electric energy meter, charging system and charging management method

Abstract

The invention discloses a novel intelligent electric energy meter, a charging system and a charging management method, the novel intelligent electric energy meter comprises an electric energy meter main body, and the electric energy meter main body comprises an MCU, a metering chip, a power input end, a power output end, a communication unit, a CP / PP module and a high-frequency sampling module; the communication unit is configured to establish communication connection with an electric vehicle charging management server; the CP / PP module comprises a CP terminal and a PP terminal; the CP terminal is configured to be used for outputting a PWM signal to realize a charging control function; the PP terminal is configured to be used for detecting the state and the current capacity of the charging pile; the power output end comprises a power output terminal, and the power output terminal, the CP terminal and the PP terminal form a charging terminal group with a charging function; the high-frequency sampling module is configured to perform high-frequency sampling on charging voltage and current. Therefore, the intelligent electric energy meter which is highly integrated, intelligent and low in cost and integrates the charging pile function is obtained, and efficient electric vehicle charging management and service can be better achieved.

Description

Technical Field

[0001] This invention relates to the field of electricity meters, and in particular to a novel smart electricity meter, charging system, and charging management method, which are mainly used to provide efficient, intelligent, and safe charging solutions for electric vehicles. Background Technology

[0002] As the global energy structure shifts towards cleaner energy, the application of electric vehicles (EVs) is becoming increasingly widespread. In traditional EV charging systems, the electricity meter and charging station are separate devices, resulting in high system costs, complex installation, and difficult maintenance.

[0003] A few are installed inside the charging pile, for example: CN 119986074 A describes a rail-mounted electricity meter with data acquisition function, which includes an electricity meter body and a rail installed inside the charging pile. The electricity meter body includes an MCU system integrated chip, which is connected to indicator lights, CAN communication, an IoT module, and a communication module. It can collect data from ordinary electricity meters and communicate with the charging pile body.

[0004] Whether it's a charging pile separate from the electricity meter or the aforementioned charging pile with the electricity meter installed inside, both suffer from high prices and limited functionality, failing to meet users' demands for efficient, intelligent, and low-cost charging equipment. Furthermore, existing equipment has shortcomings in communication methods or protocol support, metering accuracy, integration with solar power systems, and interaction with the power grid.

[0005] Therefore, there is an urgent need for a highly integrated, intelligent, and low-cost solution to achieve efficient electric vehicle charging management and services. Summary of the Invention

[0006] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a novel smart energy meter, charging system, and charging management method. It integrates power metering, charging control, high-frequency waveform sampling, and communication functions to obtain a highly integrated, intelligent, and low-cost smart energy meter with integrated charging pile functions. This provides electric vehicle users with an efficient, intelligent, and safe charging solution, which is conducive to better realizing efficient electric vehicle charging management and services.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A novel smart energy meter includes an energy meter body, which comprises an MCU, a metering chip, a power input terminal, and a power output terminal; the metering chip is connected between the power input terminal and the MCU, and the power output terminal is connected to the MCU; The main body of the energy meter also includes a communication unit, a CP / PP module, and a high-frequency sampling module; The communication unit is connected to the MCU and is configured to establish a communication connection with the electric vehicle charging management server. The CP / PP module is connected to the MCU. The CP / PP module includes a CP terminal and a PP terminal. The CP terminal is configured to output a PWM signal to realize the charging control function. The PP terminal is configured to detect the status and current capacity of the charging pile. The power output terminal includes a power output terminal, which together with the CP terminal and the PP terminal constitute a charging terminal group with charging function. The high-frequency sampling module is connected between the power input terminal and the MCU, and is configured to perform high-frequency sampling of charging voltage and current.

[0008] As a preferred embodiment, the main body of the electricity meter also includes an RS485 module, which is connected to the MCU and configured to support communication with external devices.

[0009] As a preferred embodiment, the main body of the energy meter also includes a relay module, which is connected between the MCU and the power output terminal and is configured to control the on / off state of the circuit according to the received instructions.

[0010] As a preferred embodiment, the main body of the energy meter also includes a display screen and a real-time clock, the display screen and the real-time clock being connected to the MCU respectively.

[0011] As a preferred embodiment, the communication unit includes any one or more of the following: a Wi-SUN communication module, a Wi-Fi communication module, an LTE communication module, and a LAN communication module.

[0012] As a preferred embodiment, the CP / PP module further includes a CAN transceiver chip configured for communication with the vehicle via a CAN bus; the CAN transceiver chip is connected to the MCU; the main body of the energy meter is equipped with an automatic switching mechanism, which, when a connected vehicle is detected to support advanced communication, uses the CP and PP terminals as channels for CAN signal transmission to establish a CAN bus communication connection with the vehicle supporting advanced communication; otherwise, the traditional CP / PP control mode is maintained. A charging system includes a novel smart energy meter as described in any of the preceding claims, and a charging plug for compatibility with electric vehicles. One end of the charging plug is a plug end, and the other end is a cable end. The cable end includes a charging detection control line and a charging power line. The charging detection control line is connected to the novel smart energy meter via the PP terminal and the CP terminal, and the charging power line is connected to the novel smart energy meter via the power output terminal.

[0013] As a preferred embodiment, the main body of the electricity meter is installed inside a waterproof power box.

[0014] As a preferred embodiment, the power input terminal is connected to a circuit breaker and / or a power protection device, and is installed together with the main body of the electricity meter inside the waterproof power box.

[0015] A charging management method, based on the charging system described in any of the preceding claims, the method comprising the following measures: (a) The new smart energy meter establishes a communication connection with the electric vehicle charging management server through a communication unit and receives remote control commands; (b) The new smart energy meter outputs a PWM signal through the CP terminal to control the charging current and voltage; (d) The new smart energy meter detects the status and current capacity of the charging pile through the PP terminal to ensure the safety of the charging process; (e) The new smart energy meter collects charging voltage and current data in real time through a high-frequency sampling module, analyzes the high-frequency sampling waveform to identify abnormal states and issue warnings or suspend charging. (f) The new smart energy meter provides a billing mode based on electricity consumption and time, and displays the cumulative electricity consumption, charging time and communication status on the display screen.

[0016] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly integrates a communication unit, a CP / PP module, and a high-frequency sampling module into the main body of the energy meter. The communication unit is connected to the MCU and configured to establish a communication connection with the electric vehicle charging management server. The CP / PP module is connected to the MCU and includes CP and PP terminals. The CP terminal is configured to output a PWM signal to achieve charging control. The PP terminal is configured to detect the status and current capacity of the charging pile. The power output terminal includes a power output terminal, which, together with the CP and PP terminals, constitutes a charging terminal group with charging function. The high-frequency sampling module is connected between the power input terminal and the MCU and is configured to perform high-frequency sampling of charging voltage and current. Thus, it integrates power metering, charging control, high-frequency waveform sampling, and communication functions, resulting in a highly integrated, intelligent, and low-cost smart energy meter with integrated charging pile functions. This provides electric vehicle users with an efficient, intelligent, and safe charging solution, which is conducive to better realizing efficient electric vehicle charging management and services.

[0017] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a perspective view of a novel smart energy meter according to an embodiment of the present invention; Figure 2 Another perspective view of the novel smart energy meter according to an embodiment of the present invention; Figure 3 This is an exploded view of a novel smart energy meter according to an embodiment of the present invention (terminal cover removed). Figure 4 This is a detailed functional block diagram of a novel smart energy meter according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the overall framework of a novel smart energy meter applied to a charging system according to an embodiment of the present invention; Figure 6 This is a detailed functional block diagram of the CP / PP module of the novel smart energy meter according to an embodiment of the present invention (and shows its connection relationship with the MCU). Figure 7 This is a block diagram of a CAN bus communication module based on CP / PP terminals between a smart energy meter and an electric vehicle, according to an embodiment of the present invention. Figure 8 This is a flowchart of the automatic switching mechanism of a smart energy meter when charging an electric vehicle, according to an embodiment of the present invention (showing the automatic switching charging method). Figure 9 This is an interactive diagram illustrating the communication between a smart energy meter and multiple systems of an electric vehicle, according to an embodiment of the present invention. Detailed Implementation

[0019] Please refer to Figures 1 to 9 As shown, it illustrates a specific embodiment of the present invention.

[0020] A novel smart energy meter integrates charging pile functionality into the meter itself, suitable for DC or AC charging applications. It includes an energy meter body 100, which comprises an MCU, a metering chip, a power input terminal 17, and a power output terminal. The metering chip is connected between the power input terminal and the MCU, and the power output terminal is connected to the MCU. Furthermore, the energy meter body 100 also includes a communication unit (supporting wired or wireless communication), a CP / PP module 101, and a high-frequency sampling module, integrating power metering, charging control, high-frequency waveform sampling, and communication functions into one unit, supporting DC or AC power metering to control the start and stop of charging.

[0021] The communication unit is connected to the MCU and is configured to establish a communication connection with the electric vehicle charging management server and receive remote control commands. The communication unit is also configured to communicate with the power company's electricity meter and read grid data. The electricity meter body 100 is provided with a communication unit port 14, which is connected to the MCU. The communication unit is connected to the communication unit via the communication unit port 14. The communication unit includes any one or more of a Wi-SUN communication module, a Wi-Fi communication module, an LTE communication module, and a LAN communication module. For example, it connects to the electric vehicle charging management server via one or more of these modules to receive and execute remote control commands. The optional Wi-SUN or Wi-Fi communication module is used to communicate with the power company's electricity meter and read grid data to optimize the charging process.

[0022] The CP / PP module 101 is connected to the MCU. The CP / PP module 101 includes a CP terminal 11 and a PP terminal 12. The CP terminal 11 is configured to output a PWM signal to realize the charging control function, thereby controlling the charging current and voltage. The PP terminal 12 is configured to detect the status and current capacity of the charging pile to ensure the safety of the charging process. The power output terminal includes a power output terminal 13. The power output terminal 13, together with the CP terminal 11 and the PP terminal 12, constitutes a charging terminal group with charging function. The high-frequency sampling module (specifically, the high-frequency ADC sampling module) is connected between the power input terminal and the MCU. It is configured to perform high-frequency sampling (e.g., >1 kHz) of charging voltage and current. Typically, it can analyze load characteristics through artificial intelligence (e.g., NILM) algorithms to achieve charging load monitoring and abnormal charging state detection functions. For example, it can analyze high-frequency sampling waveforms to identify abnormal states and issue warnings or suspend charging.

[0023] The main body 100 of the electricity meter also includes an RS485 module 18, which is connected to the MCU and is configured to support communication connections with other external devices (such as photovoltaic inverters, weather stations or PLC control units) to achieve system integration and expansion.

[0024] The main body 100 of the electricity meter also includes a relay module, which is connected between the MCU and the power output terminal and is configured to control the on and off of the circuit according to the received instructions.

[0025] The main body 100 of the electricity meter also includes an LCD display screen 15 and a real-time clock, which are respectively connected to the MCU. In use, it can provide a billing mode based on electricity consumption or time, and display the accumulated electricity consumption, charging time, communication status and other relevant information on the LCD display screen 15.

[0026] The CP / PP module also includes a CAN transceiver chip configured for CAN bus-based communication with the vehicle. The CAN transceiver chip is connected to the MCU. The energy meter body 100 is equipped with an automatic switching mechanism. When it detects that the connected vehicle supports advanced communication (i.e., CAN communication), the CP terminal 11 and PP terminal 12 serve as channels for CAN signal transmission to establish a CAN bus communication connection with the vehicle supporting advanced communication. This is used to implement advanced charging functions, vehicle health diagnostics, and battery status monitoring, and to send diagnostic reports to the electric vehicle charging management server. Otherwise, the traditional CP / PP control mode is maintained. The automatic switching mechanism can employ handshake protocols, voltage or signal detection, etc. In actual design, one or more of these methods can be configured. Specifically: Method 1: A detection module is added to the CP / PP terminal, configured to detect whether the vehicle supports advanced communication. This detection module is connected to the MCU. When the detection module detects that the vehicle supports advanced communication, the CP / PP terminal serves as a channel for CAN signal transmission, establishing a CAN bus communication connection (i.e., the charging system and electric vehicle charging directly use CAN communication). When the detection module detects that the vehicle does not support advanced communication, the traditional CP / PP control mode is maintained. The detection module includes a voltage detection circuit configured to measure the voltage change of the CP / PP terminal to determine whether the vehicle supports advanced communication. Alternatively, the detection module includes a signal analysis unit configured to analyze the signal characteristics (e.g., frequency, waveform) of the CP / PP terminal. One end of the detection module is connected to the CP / PP terminal, and the other end is connected to the switching control line 102. The MCU has a traditional CP / PP signal connection terminal and a CAN communication connection terminal (the CAN communication connection terminal is connected to a CAN communication module). The switching control line switches the CP / PP terminal to connect with the traditional CP / PP signal connection terminal or the CAN communication connection terminal according to the detection result of the detection module.

[0027] Method 2: The automatic switching mechanism defines specific CAN message frames to confirm the communication capabilities of both parties. For example, using ISO 15764 and KWP2000 protocols for CAN bus communication, specific diagnostic message frames are sent during the handshake phase to confirm the communication capabilities of both parties, and the functional mode of the CP / PP terminals is dynamically adjusted based on the test results. Regardless of whether it's Method 1 or Method 2, the automatic switching mechanism adjusts the hardware configuration or software protocol stack based on the test results (specifically, the test results from the detection module or the confirmation results from the handshake protocol) to achieve function switching.

[0028] It should be noted that the CAN bus is a known serial communication protocol widely used in automotive industrial control and other fields for communication between automotive electronic systems. It features high reliability, strong anti-interference capability, and good real-time performance. In a CAN communication system, the CAN communication module is a key component. The CAN communication module includes a CAN controller and a CAN transceiver chip. The CAN controller is typically integrated into a processor, microcontroller, or embedded system, but there are also independent CAN controllers that can independently send and receive CAN bus data. Therefore, in this invention, if an MCU with an integrated CAN controller is used, the CAN transceiver chip is connected to the CAN transceiver chip; if an MCU without an integrated CAN controller is used, a CAN communication module is added for the CP / PP terminals. This CAN communication module includes an interconnected CAN controller and the CAN transceiver chip, with the CAN controller connected to the MCU.

[0029] Next, we will introduce the method for automatic charging switching, including the following steps: Step 1: Connect the charging plug of the smart energy meter to the vehicle; Step 2: The smart energy meter immediately detects the vehicle's communication capability. It can use voltage changes on the CP / PP terminals, specific signal characteristics (such as frequency and waveform), or handshake signals to determine whether the vehicle supports CAN communication. This also means detecting whether the vehicle's communication capability supports advanced communication (CAN communication), and intelligently selects the communication mode based on the detection results. If so, the CP / PP terminal is used as the channel for CAN signal transmission to establish a CAN bus communication connection with the vehicle. This CAN bus communication connection connects to the vehicle's internal in-vehicle network system, i.e., the CAN network. Once the smart meter successfully connects to the vehicle and initiates CAN communication, it determines the vehicle's battery parameters (e.g., capacity, charging current) and notifies the vehicle of its own parameters (e.g., charger capacity). Then, it begins charging the vehicle (electric vehicle). During this process, the traditional CP / PP function is replaced by CAN communication, which acquires battery status parameters in real time and performs intelligent charging control to ensure the safety and efficiency of the charging process. During charging, the smart meter and vehicle continue to monitor the charging status and control parameters such as charging current via CAN communication, enabling battery status monitoring (e.g., reading battery SOC, SOH, etc.), fault diagnosis (e.g., obtaining vehicle fault codes and detailed information through diagnostic protocols such as UDS / KWP2000), and advanced charging control (e.g., working in conjunction with the vehicle ECU to achieve intelligent charging modes, such as constant current / constant voltage charging), until charging is complete and the connection is disconnected. If not, the traditional CP / PP control mode is maintained at the CP / PP terminal to start charging the vehicle (electric vehicle) until charging is complete and the connection is disconnected.

[0030] During the charging process in CAN communication mode (also referring to CAN based on CP / PP mode), since the smart energy meter is in a state of bidirectional communication with the vehicle ECU and other systems through the CAN bus interface, it can achieve the following functions: 1. Battery Health Assessment: By monitoring battery status parameters over a long period of time, the health status of the battery is assessed and its lifespan is predicted.

[0031] 2. Anomaly Detection: Real-time monitoring of abnormal conditions during the charging process (such as overvoltage, undervoltage, and overcurrent), reading vehicle fault codes, and sending alarm information via the CAN bus; adjusting the charging mode based on feedback information from the vehicle ECU to ensure a safe and efficient charging process.

[0032] 3. Energy Management: Communicates with the vehicle's energy management system via CAN bus communication, works collaboratively with the system, dynamically adjusts power, and optimizes charging strategies based on battery information obtained from CAN communication to improve energy efficiency. 4. Information obtained from the CAN bus can be uploaded to the cloud server via wired or wireless communication modules to achieve local or remote cloud monitoring and management (including at least: battery status monitoring, fault diagnosis and charging strategy optimization, V2H control, etc.).

[0033] 5. A new type of smart energy meter integrates the charging pile function into the energy meter. Before power supply begins, it sends a diagnostic trigger signal to the connected device via CAN communication and is equipped with diagnostic trigger control means to control power supply permission or rejection based on the response of the aforementioned device.

[0034] 6. The new smart energy meter has a response recording method that records the aforementioned response with a timestamp and saves it together with multiple power supply histories or outputs it to the outside.

[0035] Provide a charging system,The system includes the novel smart energy meter described above, and a charging plug compatible with electric vehicles. This novel smart energy meter is compatible with various charging plugs, such as CCS1&2 and CCS Type 1&2. The charging plug can be any commercially available standard charging plug compatible with CCS1&2, CCS Type 1, and Type 2, possessing CP and PP contacts. One end of the charging plug is the plug end, and the other end is the cable end. The cable end includes a charging detection control line and a charging power line. The charging detection control line is connected to the novel smart energy meter via the PP terminal 12 and the CP terminal 11. The charging power line is connected to the novel smart energy meter via the power output terminal. The energy meter body 100 and other necessary protective devices (e.g., circuit breakers, fuses, etc.) are installed in a waterproof electrical box. For example, the power input terminal is connected to a circuit breaker and / or other power protection devices, and is installed together with the energy meter body 100 in the waterproof electrical box to ensure equipment safety. It is evident that the solution of this invention is easy to implement and promote. It is easy to upgrade and improve existing smart meters. By connecting the new smart meter to a standard charging plug, it can provide a high-efficiency, intelligent, safe charging solution with advanced data analysis capabilities for vehicle charging systems, effectively expanding the functions of traditional meters.

[0036] In addition, a charging management method is introduced. Based on the aforementioned charging system, it uses the new smart energy meter to realize power metering, charging control and communication functions, and interacts with the electric vehicle charging management server for data exchange. The method includes the following measures: (a) The new smart energy meter establishes a communication connection with the electric vehicle charging management server through a communication unit and receives remote control commands to realize remote control and status monitoring; the electric vehicle charging management server can be a server that supports OCPP or other communication protocols; (b) The new smart energy meter outputs a PWM signal through the CP terminal 11 to control the charging current and voltage; (d) The new smart energy meter detects the status and current capacity of the charging pile through the PP terminal 12 (specifically, it can perform CAN communication detection) to ensure the safety of the charging process; (e) The new smart energy meter uses a high-frequency sampling module (the smart energy meter has a built-in high-speed analog-to-digital converter ADC) to sample charging voltage and current at high frequencies (>1 kHz), acquiring charging voltage and current data in real time to obtain high-precision voltage and current waveform data. The high-frequency sampled waveforms are analyzed to identify abnormal states and issue warnings or suspend charging. The sampled data can be uploaded to an artificial intelligence cloud server via the communication unit, or stored locally / analyzed by artificial intelligence, for advanced applications such as non-intrusive load monitoring (NILM), battery health diagnostics, and charging process monitoring. Data analysis algorithms can identify charging anomalies (such as overcurrent, undervoltage, power fluctuations, etc.) and suspend charging when potential hazards are detected, ensuring charging safety.

[0037] (f) The new smart energy meter provides a billing mode based on electricity consumption and time, and displays accumulated electricity consumption, charging time, communication status, and other relevant information on the LCD display screen 15. The system calculates the fee based on the accumulated electricity consumption or charging time, and users can pay through the electricity consumption or time-based billing mode to meet the charging needs of different users. At the same time, since the RS485 module connects to the photovoltaic inverter and the weather station, it realizes the communication connection between the new smart energy meter and the photovoltaic inverter, and makes appropriate adjustments to the use of solar power generation and grid power (main power input) for electric vehicle charging, for example, preferentially using solar power generation to achieve energy-saving effects.

[0038] (g) Additional functions: Supports CAN based on CP / PP bus communication to realize advanced vehicle charging functions, vehicle health diagnosis and battery status monitoring, and sends diagnostic reports to the electric vehicle charging management server.

[0039] (h) Before power supply is started, a diagnostic trigger signal is sent to the connected device via CAN communication, and a diagnostic trigger control means is provided to control the power supply device to grant or deny power supply based on the response of the aforementioned device.

[0040] (i) It has the ability to record the aforementioned response with a timestamp and save it together with multiple power supply histories or output it to the outside.

[0041] In summary, the novel smart energy meter of this invention integrates power metering, charging control, high-frequency waveform sampling, and communication functions, resulting in a highly integrated, intelligent, and low-cost smart energy meter with integrated charging pile functionality. This provides electric vehicle users with an efficient, intelligent, and safe charging solution, facilitating better efficient electric vehicle charging management and services. Specifically, this invention has the following advantages: 1. This invention significantly reduces the overall cost of charging pile equipment and electricity meters in the prior art by integrating charging pile functionality into the electricity meter.

[0042] 2. The new smart energy meter provides CP and PP terminals for realizing electric vehicle charging function and PWM control signal output, and is compatible with various charging plugs such as CCS1&2 and CCS Type 1&2.

[0043] 3. The new smart energy meter supports multiple communication modules, enabling seamless connection with charging management servers, power grids, solar power systems and other external devices.

[0044] 4. The high-frequency waveform sampling function provides high-precision voltage and current data, supports artificial intelligence analysis functions, such as non-intrusive load monitoring (NILM), battery health diagnosis and charging process monitoring, and other advanced applications, which improves charging safety and user experience.

[0045] 5. CAN provides vehicle health diagnostic capabilities based on CP / PP bus communication, improving charging safety and enhancing the user experience.

[0046] 6. When used in conjunction with a waterproof casing and electrical safety protection measures, the new smart energy meter ensures stable operation in complex environments.

[0047] 7. The electricity metering data, charging process data, and high-frequency sampling data collected by the new smart electricity meter can be uploaded to the upper-level energy management system through the communication unit for unified data management and analysis.

[0048] It should be noted that the electricity meter described in this invention is an auxiliary metering device for electric vehicle charging and energy management, and is not used as a legally mandated meter by the power company. The metering data, charging data, and related energy data acquired through the smart electricity meter and charging system described in this invention not only reflect the actual energy usage status but can also be further used for semantic transformation and control decision support. For example, based on the acquired electric vehicle charging data, indicators related to vehicle usage such as drivable distance or greenhouse gas emissions (CO2) can be generated; based on household electricity consumption and power generation data, indicators reflecting energy self-sufficiency calculated over time can be generated; and based on electricity sales data, reference indicators for assessing the remaining charging capacity of electric vehicles can be generated. Through the above-mentioned "data → meaning → control" processing path, the smart electricity meter and charging system not only exist as metering and control devices but also provide basic data conditions for subsequent energy management, behavior guidance, and control strategy formulation.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A novel smart energy meter, comprising an energy meter body, the energy meter body including an MCU, a metering chip, a power input terminal, and a power output terminal; the metering chip is connected between the power input terminal and the MCU, and the power output terminal is connected to the MCU, characterized in that, The main body of the energy meter also includes a communication unit, a CP / PP module, and a high-frequency sampling module; The communication unit is connected to the MCU and is configured to establish a communication connection with the electric vehicle charging management server. The CP / PP module is connected to the MCU. The CP / PP module includes a CP terminal and a PP terminal. The CP terminal is configured to output a PWM signal to realize the charging control function. The PP terminal is configured to detect the status and current capacity of the charging pile. The power output terminal includes a power output terminal, which together with the CP terminal and the PP terminal constitute a charging terminal group with charging function. The high-frequency sampling module is connected between the power input terminal and the MCU, and is configured to perform high-frequency sampling of charging voltage and current.

2. The novel smart energy meter according to claim 1, characterized in that, The main body of the electricity meter also includes an RS485 module, which is connected to the MCU and is configured to support communication with external devices.

3. The novel smart energy meter according to claim 1, characterized in that, The main body of the electricity meter also includes a relay module, which is connected between the MCU and the power output terminal and is configured to control the on and off of the circuit according to the received instructions.

4. The novel smart energy meter according to claim 1, characterized in that, The main body of the electricity meter also includes a display screen and a real-time clock, which are respectively connected to the MCU.

5. The novel smart energy meter according to claim 1, characterized in that, The communication unit includes any one or more of the following: Wi-SUN communication module, Wi-Fi communication module, LTE communication module, and LAN communication module.

6. The novel smart energy meter according to claim 1, characterized in that, The CP / PP module also includes a CAN transceiver chip configured for communication with the vehicle via a CAN bus. The CAN transceiver chip is connected to the MCU. The main body of the energy meter is equipped with an automatic switching mechanism. When it detects that the connected vehicle supports advanced communication, the CP and PP terminals serve as channels for CAN signal transmission to establish a CAN bus communication connection with the vehicle that supports advanced communication. Otherwise, the traditional CP / PP control mode is maintained.

7. A charging system, characterized in that, The novel smart energy meter, including any one of claims 1 to 6, further includes a charging plug for compatibility with electric vehicles, one end of the charging plug being a plug end and the other end being a cable end, the cable end including a charging detection control line and a charging power line, the charging detection control line being connected to the novel smart energy meter through the PP terminal and the CP terminal, and the charging power line being connected to the novel smart energy meter through the power output terminal.

8. The charging system according to claim 7, characterized in that, The main body of the electricity meter is installed inside a waterproof power box.

9. The charging system according to claim 8, characterized in that, The power input terminal is connected to a circuit breaker and / or a power protection device, and is installed together with the main body of the electricity meter inside the waterproof power box.

10. A charging management method, characterized in that: Based on the charging system of any one of claims 7 to 9, the method includes the following measures: (a) The new smart energy meter establishes a communication connection with the electric vehicle charging management server through a communication unit and receives remote control commands; (b) The new smart energy meter outputs a PWM signal through the CP terminal to control the charging current and voltage; (d) The new smart energy meter detects the status and current capacity of the charging pile through the PP terminal to ensure the safety of the charging process; (e) The new smart energy meter collects charging voltage and current data in real time through a high-frequency sampling module, analyzes the high-frequency sampling waveform to identify abnormal states and issue warnings or suspend charging. (f) The new smart energy meter provides a billing mode based on electricity consumption and time, and displays the cumulative electricity consumption, charging time and communication status on the display screen.

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