Smart socket with power protection function and electric vehicle charging protection control method

Abstract

The application discloses a smart socket with electric quantity protection function and an electric vehicle charging protection control method, and the smart socket comprises an AC-DC power module, an electric quantity metering module, a WiFi communication module, a main control processing unit, a relay driving switch module, a local light touch button module and an AC output socket. The electric quantity metering module collects charging voltage and current in real time and calculates cumulative charging electric quantity; a user defines a target charging electric quantity threshold value through a mobile terminal APP and sends the target charging electric quantity threshold value to the main control processing unit through WiFi; when the cumulative charging electric quantity reaches the set threshold value, the main control processing unit controls the relay to be disconnected, and the power supply of the AC output socket is cut off. The application supports the user to define the charging electric quantity threshold value, realizes on-demand power-off protection, and avoids battery aging caused by long-term full charging; meanwhile, offline on-off control is realized through the local light touch button, the network dependence problem is solved, the structure is compact, the cost is low, and the application is suitable for a household single electric vehicle use scene.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging safety technology, and in particular to a smart socket with power protection function and an electric vehicle charging protection control method, especially a transfer socket. Background Technology

[0002] With the increasing popularity of electric two-wheelers, home charging scenarios have expanded significantly. The quality of electric vehicle chargers on the market varies greatly, and some chargers lack comprehensive full-charge protection. Storing lithium batteries at 100% charge for extended periods can accelerate battery aging and, in severe cases, lead to thermal runaway and fire risks.

[0003] Existing smart sockets are mainly divided into two categories. One type is the timed power-off socket, which relies on a preset charging time to cut off power. However, this requires repeated adjustments to the time parameters for batteries of different capacities, and the time cannot match the actual battery charging status. The other type is the metering smart socket, which only supports power-off after a drop in charging current and can only cut off power when the battery is 100% fully charged. It cannot achieve premature power-off protection for lithium batteries at any intermediate charging level.

[0004] In addition, existing WiFi smart sockets are highly dependent on wireless networks. Once the WiFi is disconnected, the mobile app cannot control them, and they lack local manual operation buttons, making the devices completely unusable. Large-scale community charging stations are bulky and expensive, making them unsuitable for ordinary households with a single electric vehicle. Summary of the Invention

[0005] This invention aims to provide a small smart socket for home use and a method for protecting and controlling the charging of electric vehicles. It allows users to set a charging threshold and automatically cut off the power. It also has local button backup control, thus overcoming the shortcomings of existing technologies.

[0006] To achieve the above objectives, on the one hand, the present invention provides the following technical solution: a smart socket with power protection function, characterized in that it includes: an AC-DC power module, a power metering module, a WiFi communication module, a main control processing unit, a relay drive switch module, a local tactile button module, and an AC output socket; The input terminal of the AC-DC power module is connected to the AC input pin of the mains power, and the AC-DC power module outputs DC working voltage to power the power metering module and the main control processing unit respectively. The voltage sampling terminal and current sampling terminal of the power metering module are electrically connected to the power supply circuit from the AC input pin to the AC output socket. They are used to collect the charging voltage and charging current on the AC output socket side in real time, calculate the cumulative charging power, and send the power data to the main control processing unit. The WiFi communication module is electrically connected to the main control processing unit. The WiFi communication module is used to establish wireless network communication with an external mobile APP, receive the user-defined target charging power threshold sent by the mobile APP, and at the same time transmit the charging voltage, current, and cumulative charging power status back to the mobile APP. The relay drive switch module includes a transistor drive unit and a relay, with the main contacts of the relay connected in series between the AC input pin and the AC output socket; the relay drive switch module is controlled by the main control processing unit. The local touch button module is connected to the input terminal of the main control processing unit and is used to receive local manual on / off commands; The main control processing unit is configured to: receive the cumulative charging power reported by the power metering module; when the cumulative charging power reaches the target charging power threshold set by the user, output a control signal to the relay drive switch module to disconnect the main contacts of the relay and cut off the AC output socket's mains power output; and respond to the manual switch command of the local tactile button module to control the socket's on / off state.

[0007] A further embodiment of the present invention: The transistor driving unit of the relay driving switch module receives the level signal from the main control processing unit, controls the transistor to be turned on / off, and then controls the relay coil to be energized and de-energized, thereby realizing the closing and opening of the relay main contacts.

[0008] A further embodiment of the present invention: the AC-DC power supply module, the power metering module, the WiFi communication module, the main control processing unit, the relay drive switch module, and the local tactile button module are integrated on the same PCB circuit board, and the AC input pin and the AC output socket are located on opposite sides of the PCB board and soldered to the PCB board.

[0009] A further aspect of the present invention: the main control processing unit is also equipped with a charging curve analysis program module; The main control processing unit is also configured to: based on the collected data, draw the charging power-time curve P(t) and the current-time curve I(t) through the charging curve analysis program module, and extract the following characteristic parameters of the charging curve: Constant current phase current value I_CC, constant voltage transition voltage value U_CV, constant voltage phase duration T_CV; The extracted feature parameters are transmitted to the mobile app via a WiFi communication module. The mobile app receives the extracted feature parameters and compares and matches them with cloud data to identify the type of the current charger. After identifying the charger type, when the deviation between the real-time charging curve and the historical standard curve exceeds a preset threshold, the mobile app pushes a warning message to the user. When the deviation exceeds the safety threshold, a disconnect command is wirelessly sent. The main control processing unit receives the disconnect command from the mobile APP through the WiFi communication module, outputs a control signal to the relay drive switch module, disconnects the main contacts of the relay, and cuts off the AC output socket's mains power output.

[0010] On the other hand, the present invention also provides the following technical solution: an electric vehicle charging protection control method, applied to the above-mentioned smart socket, comprising the following steps: S1: The smart socket connects to the AC power supply through the AC input pin, and the AC-DC power module supplies power to the corresponding module and unit. S2: The WiFi communication module establishes a network connection with the mobile APP; the user sets the target charging power threshold in the mobile APP interface, and the APP sends the threshold to the main control processing unit. S3: When the electric vehicle charger is plugged into the AC output socket, the main control processing unit controls the relay to close, the AC output socket outputs mains power, and charging begins; the power metering module collects the voltage and current of the charging circuit in real time, calculates the cumulative charging power and reports it to the main control processing unit. At the same time, the main control processing unit uploads the charging parameters to the mobile APP for display via the WiFi communication module. S4: The main control processing unit compares the real-time cumulative charging power with the user-set target charging power threshold; when the cumulative charging power reaches the set threshold, the main control processing unit outputs a signal to control the relay to drive the switch module, disconnect the relay, cut off the AC output socket's mains power output, and stop charging.

[0011] A further aspect of the present invention: In step S4: If the cumulative charging capacity has not reached the target charging capacity threshold, but the main control processing unit determines that the battery is fully charged based on the drop in charging current, it actively outputs a signal to control the relay drive switch module to disconnect the relay.

[0012] Further aspects of the present invention: In step S3: Based on the collected data, the main control processing unit also plots the charging power-time curve P(t) and the current-time curve I(t) using the charging curve analysis program module to extract the following characteristic parameters of the charging curve: Constant current phase current value I_CC, constant voltage transition voltage value U_CV, constant voltage phase duration T_CV; The extracted feature parameters are transmitted to the mobile app via a WiFi communication module. In step S4: The mobile APP also compares and matches the continuously received and extracted feature parameters with the APP cloud data to identify the type of the current charger; after identifying the charger type, when the deviation between the real-time charging curve and the historical standard curve exceeds a preset threshold, a warning message is pushed to the user through the mobile APP. When the deviation exceeds the safety threshold, a disconnect command is wirelessly sent. The main control processing unit receives the disconnect command from the mobile APP through the WiFi communication module and outputs a control signal to the relay drive switch module to disconnect the main contacts of the relay.

[0013] Compared with existing technologies, the beneficial effects of this technical solution are: the present invention supports user-defined charging power thresholds, realizes on-demand power-off protection, and avoids battery aging caused by long-term full charging; at the same time, it realizes offline on / off control through local touch buttons, solves the network dependency problem, has a compact structure and low cost, and is suitable for the use of a single electric vehicle in a family.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural cross-sectional view of the present invention; Figure 3 This is the circuit schematic diagram of the first part of the present invention; Figure 4 This is the second part of the circuit schematic diagram of the present invention; The corresponding labels in the attached diagram are explained as follows: Smart socket-100, AC-DC power module-101, power metering module-102, WiFi communication module-103, main control processing unit-104, relay drive switch module-105, local tactile button module-106, AC output socket-107, AC input plug-in-108, PCB board-109. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-4 The smart socket 100 with power protection function includes: AC-DC power module 101, power metering module 102, WiFi communication module 103, main control processing unit 104, relay drive switch module 105, local tactile button module 106, and AC output socket 107.

[0019] The input terminal of the AC-DC power module is connected to AC input pin 108. The AC-DC power module outputs DC operating voltage to power the power metering module and the main control processing unit, respectively.

[0020] The voltage sampling terminal and current sampling terminal of the power metering module are electrically connected to the power supply circuit from the AC input pin to the AC output socket. They are used to collect the charging voltage and charging current on the AC output socket side in real time, calculate the cumulative charging power, and send the power data to the main control processing unit.

[0021] The WiFi communication module is electrically connected to the main control processing unit. The WiFi communication module is used to establish wireless network communication with an external mobile APP, receive the user-defined target charging power threshold sent by the mobile APP, and at the same time transmit the charging voltage, current, and cumulative charging power status back to the mobile APP.

[0022] The relay drive switch module includes a transistor drive unit and a relay, with the main contacts of the relay connected in series between the AC input pin and the AC output socket; the relay drive switch module is controlled by the main control processing unit.

[0023] The local touch button module is connected to the input terminal of the main control processing unit and is used to receive local manual on / off commands.

[0024] The main control processing unit is configured to: receive the cumulative charging power reported by the power metering module; when the cumulative charging power reaches the target charging power threshold set by the user, output a control signal to the relay drive switch module to disconnect the main contacts of the relay and cut off the AC output socket's mains power output; and respond to the manual switch command of the local tactile button module to control the socket's on / off state.

[0025] In this embodiment, the relay main contacts are as follows: Figure 3 The main switch contacts shown are pins 3 and 4.

[0026] In this embodiment, in response to the manual switch command of the local tactile button module, the socket on / off control is performed: that is, the main control processing unit outputs a control signal to the relay drive switch module to control the relay main contacts to be on / off.

[0027] In this embodiment, the power metering module uses a power metering chip U3 to collect the power on the AC output socket side. The cumulative power consumed by external charging indirectly represents the charging level of the electric vehicle battery, without directly reading the SOC signal of the electric vehicle battery BMS system.

[0028] In this embodiment, when the WiFi communication module is disconnected and cannot communicate with the mobile APP (such as a mobile phone APP), the local touch button module can still independently complete the opening and closing operations of the AC output socket.

[0029] In this embodiment, for example, the electric vehicle's battery has a rechargeable capacity of 2 kWh, and the user knows on the electric vehicle's display screen that the current remaining battery capacity is 0.4 kWh. Therefore, the charging capacity threshold can be set through the mobile APP to allow the battery to be charged to 35%-75% of its total capacity.

[0030] For example, by setting the charging threshold to 0.8 kWh through a mobile app, the remaining charge of the battery after charging is 1.2 kWh, which is 60% of the total charge of 2 kWh.

[0031] For example, by setting the charging threshold to 0.3 kWh through a mobile app, the remaining charge of the battery after charging is 1.5 kWh, which is 75% of the total charge of 2 kWh.

[0032] For example, by setting the charging threshold to 3.75 kWh through a mobile app, the remaining charge of the battery after charging is 0.7 kWh, which is 35% of the total charge of 2 kWh.

[0033] In some embodiments, the transistor driving unit of the relay driving switch module receives the level signal from the main control processing unit, controls the transistor to be turned on / off, and then controls the relay coil to be energized and de-energized, thereby realizing the closing and opening of the relay main contacts.

[0034] In some embodiments, such as Figure 4 As shown, the model of the chip U2 in the main control processing unit is LN882HKI.

[0035] The control terminal Really of chip U2 in the main control processing unit outputs a corresponding high / low voltage level signal to the gate of transistor Q3 in the transistor driving unit through resistor R22 to control the transistor to turn on / off.

[0036] After transistor Q3 is turned on, the +5V power output from the AC-DC power module can flow through the relay coil of relay K2, causing the relay coil to attract the relay main contacts and close the relay main contacts.

[0037] In some embodiments, the AC-DC power supply module, power metering module, WiFi communication module, main control processing unit, relay drive switch module, local tactile button module, and other circuit modules are integrated on the same PCB board. The AC input pin and AC output socket are located on opposite sides of the PCB board 109 and soldered to the PCB board. The overall structure is more compact and more suitable for home miniaturization.

[0038] For PCB circuit design, please refer to Figure 3 , 4 The circuit schematic is used to design the corresponding circuit.

[0039] In some embodiments, the main control processing unit is further configured with a charging curve analysis program module, which is used to analyze the data collected by the power metering module and extract characteristic parameters of the charging process.

[0040] The main control processing unit is also configured to: based on the collected data, plot the charging power-time curve P(t) and the current-time curve I(t) through the charging curve analysis program module, in order to extract the following characteristic parameters of the charging curve: Constant current stage current value I_CC: The average current value when the current tends to stabilize in the initial stage of charging. Constant voltage transition voltage U_CV: The voltage value at which the current begins to continuously decrease; The duration of the constant voltage phase, T_CV, is the time from entering the constant voltage phase until the current drops to a preset current threshold (e.g., 0.3A). The extracted feature parameters are transmitted to the mobile app via a WiFi communication module. The mobile app receives the extracted feature parameters and compares them with the cloud data (feature parameters of various types of chargers pre-entered) to identify the type of the current charger (including brand, model, rated voltage, rated current and other parameters). After identifying the charger type, when the deviation between the real-time charging curve and the historical standard curve (pre-entered in the cloud data of the app) exceeds a preset threshold, it is determined that the charger may be aging or faulty, and a warning message is pushed to the user through the mobile app. When the deviation exceeds a safety threshold (e.g., constant current deviation > 15%, breakover voltage deviation > 5%), a disconnect command is wirelessly issued. The main control processing unit receives the disconnect command from the mobile APP via the WiFi communication module, outputs a control signal to the relay drive switch module, disconnects the relay main contacts, and cuts off the AC output socket's mains power output. Overall, charging is safer and smarter.

[0041] In some embodiments, the preset threshold can be the same value as the safety threshold, for example, both the preset threshold and the safety threshold are: constant current deviation > 15% and breakover voltage deviation > 5%. In some embodiments, the preset threshold can be a value less than the safety threshold. For example, the safety threshold is: constant current deviation > 15% and transition voltage deviation > 5%. The preset threshold can be: constant current deviation > 9% and transition voltage deviation > 3%.

[0042] Please see Figure 1-4 This embodiment also proposes a method for protecting and controlling the charging of electric vehicles, including the following steps: S1: The smart socket is connected to AC power via the AC input pin, and the AC-DC power module supplies power to the corresponding module. S2: The WiFi communication module establishes a network connection with the mobile APP; the user sets the target charging power threshold in the mobile APP interface, and the APP sends the threshold to the main control processing unit. S3: When the electric vehicle charger is plugged into the AC output socket, the main control processing unit controls the relay to close, the AC output socket outputs mains power, and charging begins; the power metering module collects the voltage and current of the charging circuit in real time, calculates the cumulative charging power and reports it to the main control processing unit. At the same time, the main control processing unit uploads the charging parameters to the mobile APP for display via the WiFi communication module. S4: The main control processing unit compares the real-time cumulative charging power with the user-set target charging power threshold; when the cumulative charging power reaches the set threshold, the main control processing unit outputs a signal to control the relay to drive the switch module, disconnect the relay, cut off the AC output socket's mains power output, and stop charging.

[0043] In this embodiment, the method only collects the power consumption on the AC output side of the socket, which can be used as a means of protecting the external socket.

[0044] In some embodiments, the method further includes step S41: the local touch button module monitors the key press in real time (e.g., ... Figure 4 As shown, when button K1 is operated, regardless of whether the WiFi network is connected, the main control processing unit directly controls the relay to switch the socket on and off upon receiving the button trigger signal.

[0045] In some embodiments, when a button trigger signal is received during charging, the main control processing unit controls the relay to disconnect the socket and records the current charged amount; when a button trigger signal is received again, the main control processing unit controls the relay to connect the socket, continues charging output, and calculates the total charged amount based on the recorded charged amount. When the cumulative charged amount reaches a set threshold, the main control processing unit outputs a signal to control the relay to drive the switch module, disconnect the relay, cut off the AC output socket's mains power output, and stop charging.

[0046] In some embodiments, the main control processing unit is further configured to confirm the trigger command of the button to perform different controls. For example, a single click within 2 seconds causes the main control processing unit to directly control the relay to switch the socket on and off, executing the pause / resume metering control described in the above embodiment. For example, two clicks within 2 seconds cause the main control processing unit to reset the metering and restart the metering.

[0047] In some embodiments, in step S4, if the cumulative charging power does not reach the target charging power threshold, the charging output is maintained and the charging power parameters are continuously collected and reported.

[0048] In some embodiments, in step S4: if the cumulative charging capacity has not reached the target charging capacity threshold, but the main control processing unit determines that it is fully charged based on the drop in charging current, it actively outputs a signal to control the relay drive switch module to disconnect the relay, cut off the AC output socket mains power output, and stop charging.

[0049] In some embodiments, in step S3: the main control processing unit further extracts the following characteristic parameters of the charging curve by plotting the charging power-time curve P(t) and the current-time curve I(t) through the charging curve analysis program module based on the collected data: Constant current stage current value I_CC: The average current value when the current tends to stabilize in the initial stage of charging. Constant voltage transition voltage U_CV: The voltage value at which the current begins to continuously decrease; The duration of the constant voltage phase, T_CV, is the time from entering the constant voltage phase until the current drops to a preset current threshold (e.g., 0.3A). The extracted feature parameters are transmitted to the mobile app via a WiFi communication module. In step S4: The mobile APP also compares and matches the continuously received and extracted feature parameters with the APP cloud data (feature parameters of various types of chargers are pre-entered) to identify the type of the current charger (including parameters such as brand, model, rated voltage, and rated current); after identifying the charger type, when the deviation between the real-time charging curve and the historical standard curve (pre-entered in the APP cloud data) exceeds a preset threshold, it is determined that the charger may be aging or faulty, and a warning message is pushed to the user through the mobile APP; When the deviation exceeds a safety threshold (e.g., constant current deviation > 15%, breakover voltage deviation > 5%), a disconnect command is wirelessly issued. The main control processing unit receives the disconnect command from the mobile APP via the WiFi communication module, outputs a control signal to the relay drive switch module, disconnects the relay main contacts, and cuts off the AC output socket's mains power output. Overall, charging is safer and smarter.

[0050] Although different chargers have different voltage and current parameters, they follow charging curves (especially the "constant current-constant voltage" mode for lithium batteries) with highly recognizable patterns. Thanks to this, the patterns or standard data of these different models can be pre-entered or uploaded to the APP cloud for subsequent comparison and matching.

[0051] For mainstream lithium battery chargers, the standard "constant current (CC) - constant voltage (CV)" charging curve includes several distinct stages and inflection points: The constant current stage current value I_CC (unit: A) is the current value during the initial charging phase when the current remains constant. This is the charger's most crucial power rating. The constant voltage transition voltage value U_CV (unit: V) is the critical voltage point at which the charger switches from "constant current" to "constant voltage" mode after the battery voltage reaches the preset maximum value. The constant voltage phase duration T_CV (in minutes) is the total duration of the constant voltage phase. This duration is strongly correlated with battery capacity and charger strategy.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A smart socket with power protection function, characterized in that, include: AC-DC power supply module, power metering module, WiFi communication module, main control processing unit, relay drive switch module, local tactile button module, AC output socket; The input terminal of the AC-DC power module is connected to the AC input pin of the mains power, and the AC-DC power module outputs DC working voltage to power the power metering module and the main control processing unit respectively. The voltage sampling terminal and current sampling terminal of the power metering module are electrically connected to the power supply circuit from the AC input pin to the AC output socket. They are used to collect the charging voltage and charging current on the AC output socket side in real time, calculate the cumulative charging power, and send the power data to the main control processing unit. The WiFi communication module is electrically connected to the main control processing unit. The WiFi communication module is used to establish wireless network communication with an external mobile APP, receive the user-defined target charging power threshold sent by the mobile APP, and at the same time transmit the charging voltage, current, and cumulative charging power status back to the mobile APP. The relay drive switch module includes a transistor drive unit and a relay, with the main contacts of the relay connected in series between the AC input pin and the AC output socket; the relay drive switch module is controlled by the main control processing unit. The local touch button module is connected to the input terminal of the main control processing unit and is used to receive local manual on / off commands; The main control processing unit is configured to: receive the cumulative charging power reported by the power metering module; when the cumulative charging power reaches the target charging power threshold set by the user, output a control signal to the relay drive switch module to disconnect the main contacts of the relay and cut off the AC output socket's mains power output; and respond to the manual switch command of the local tactile button module to control the socket's on / off state.

2. The smart socket according to claim 1, characterized in that, The transistor driving unit of the relay drive switch module receives the level signal from the main control processing unit, controls the transistor to turn on / off, and then controls the relay coil to be energized and de-energized, thereby realizing the closing and opening of the relay main contacts.

3. The smart socket according to claim 3, characterized in that, The AC-DC power supply module, power metering module, WiFi communication module, main control processing unit, relay drive switch module, and local tactile button module are integrated on the same PCB board. The AC input pin and AC output socket are located on opposite sides of the PCB board and soldered to the PCB board.

4. The smart socket according to claim 1, characterized in that, The main control processing unit is also equipped with a charging curve analysis program module; The main control processing unit is also configured to: based on the collected data, draw the charging power-time curve P(t) and the current-time curve I(t) through the charging curve analysis program module, and extract the following characteristic parameters of the charging curve: Constant current phase current value I_CC, constant voltage transition voltage value U_CV, constant voltage phase duration T_CV; The extracted feature parameters are transmitted to the mobile app via a WiFi communication module. The mobile app receives the extracted feature parameters and compares and matches them with cloud data to identify the type of the current charger. After identifying the charger type, when the deviation between the real-time charging curve and the historical standard curve exceeds a preset threshold, the mobile app pushes a warning message to the user. When the deviation exceeds the safety threshold, a disconnect command is wirelessly sent. The main control processing unit receives the disconnect command from the mobile APP through the WiFi communication module, outputs a control signal to the relay drive switch module, disconnects the main contacts of the relay, and cuts off the AC output socket's mains power output.

5. A method for protecting and controlling the charging of an electric vehicle, applied to the smart socket described in any one of claims 1-4, characterized in that, Includes the following steps: S1: The smart socket connects to AC power via the AC input pin, and the AC-DC power module supplies power to the corresponding module and unit. S2: The WiFi communication module establishes a network connection with the mobile APP; the user sets the target charging power threshold in the mobile APP interface, and the APP sends the threshold to the main control processing unit. S3: When the electric vehicle charger is plugged into the AC output socket, the main control processing unit controls the relay to close, the AC output socket outputs mains power, and charging begins; the power metering module collects the voltage and current of the charging circuit in real time, calculates the cumulative charging power and reports it to the main control processing unit. At the same time, the main control processing unit uploads the charging parameters to the mobile APP for display via the WiFi communication module. S4: The main control processing unit compares the real-time cumulative charging power with the user-set target charging power threshold; when the cumulative charging power reaches the set threshold, the main control processing unit outputs a signal to control the relay to drive the switch module, disconnect the relay, cut off the AC output socket's mains power output, and stop charging.

6. The electric vehicle charging protection control method according to claim 5, characterized in that, In step S4: If the cumulative charging capacity has not reached the target charging capacity threshold, but the main control processing unit determines that it is fully charged based on the drop in charging current, it actively outputs a signal to control the relay drive switch module to disconnect the relay.

7. The electric vehicle charging protection control method according to claim 5, characterized in that, In step S3: Based on the collected data, the main control processing unit also plots the charging power-time curve P(t) and the current-time curve I(t) using the charging curve analysis program module to extract the following characteristic parameters of the charging curve: Constant current phase current value I_CC, constant voltage transition voltage value U_CV, constant voltage phase duration T_CV; The extracted feature parameters are transmitted to the mobile app via a WiFi communication module. In step S4: The mobile APP also compares and matches the continuously received and extracted feature parameters with the APP cloud data to identify the type of the current charger; after identifying the charger type, when the deviation between the real-time charging curve and the historical standard curve exceeds a preset threshold, a warning message is pushed to the user through the mobile APP. When the deviation exceeds the safety threshold, a disconnect command is wirelessly sent. The main control processing unit receives the disconnect command from the mobile APP through the WiFi communication module and outputs a control signal to the relay drive switch module to disconnect the main contacts of the relay.

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