An electric vehicle charging management box
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-08-14
AI Technical Summary
属于大电流，时间长的运行模式,而且一般用户都选择夜晚充电，不易观察，对环境和连接设备都有一定的要求
[0010]综上所述，本实用新型具有以下有益效果：本实用新型具有结构简单、设计合理、使用智能方便，可有效的对用电进行管理和保护。其具有上电便可功能自检，利用插头上的热敏电阻检测接触发热温度，利用内部温度芯片检测内部温度，把控工作环境温度。利用电压互感器、电流互感器、零线电流互感器检测、监测用电情况；管通过单片机实现LED面板的显示和数据采集分析和处理功能，利用继电器模块实现通断管理功能。结合监测到的条件数据,实现对充电过程的管理。这种智能管理的电动汽车充电盒,可以满足安全、环保、健康和便捷的用电需求。
Smart Images
Figure CN224631569U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of charging protection device technology, and in particular to an electric vehicle charging management box. Background Technology
[0002] With the development of new energy electric vehicles, the use of electric vehicle chargers is also increasing. Most chargers on the market are direct chargers, meaning they connect the vehicle directly to the power source. A small number have metering or simple protection functions. Electric vehicle charging current typically reaches 8-13A, and charging time can be 8-15 hours. This is a high-current, long-duration operating mode, and since users generally choose to charge at night, it's difficult to monitor the process, placing certain requirements on the environment and connected equipment. This poses a certain degree of hazard. To address these hazards, a charging box with protection against ambient temperature, operating current, leakage current, and surge current is needed to intelligently manage power consumption and ensure electrical safety. Utility Model Content
[0003] The purpose of this invention is to provide an electric vehicle charging management box.
[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An electric vehicle charging management box includes a power cord input port, an LED indicator panel, an upper shell, and a lower shell. The LED indicator panel is disposed on the surface of the upper shell. The lower shell has a rectangular elliptical space with a wire pressing groove inside, and multiple bottom mounting holes on the bottom. A charging motherboard is disposed within the upper and lower shell space. The upper end of the charging motherboard has an input terminal block, which is electrically connected to the three pins of a power plug via a power cord passing through the power cord input port. The power plug has a plug temperature detection module for monitoring temperature inside. The lower end of the charging motherboard has an output terminal block, which is electrically connected to the charging gun end of the power cord via a wire passing through the power cord output port. An internal temperature detection module is integrated on the charging motherboard.
[0005] Furthermore, the motherboard integrates a relay on / off circuit module, a zero-sequence current detection circuit module, an MCU main control circuit module, a voltage detection circuit module, a surge protection circuit module, a plug temperature detection module, an internal temperature detection module, a current detection circuit module, a CP detection modulation circuit, and an AC-DC conversion module.
[0006] Furthermore, the zero-sequence current detection circuit module senses the current difference between the live (L) and neutral (N) wires through a zero-sequence coil to determine whether there is leakage. The voltage detection circuit module uses a voltage transformer to detect the voltage level in the circuit, achieving high-voltage and undervoltage protection. The current detection circuit module uses a current transformer to detect the current, achieving overcurrent protection and determining the charging status. The surge protection circuit module uses a varistor-type discharge circuit to protect the equipment from damage caused by surges. The internal temperature detection module uses a DS18B20 temperature sensor to detect the internal temperature. The relay on / off circuit module uses a high-current relay to manage the charging of the electric vehicle. The MCU main control circuit module collects information from each circuit module, analyzes the data, and issues processing instructions to the relays in the relay on / off circuit module, controlling the relays to turn on and off and providing corresponding status or fault indications to the LED indicator panel.
[0007] Furthermore, the plug temperature detection module includes a 10K thermistor built into the power plug. The thermistor is clipped into the mounting slot of the power plug. The power plug has three 1.5 square millimeter wires. One end of the three wires is used to connect to the live (L), neutral (N), and ground (PE) pins, and the other end is connected to the input terminal. Two 0.5 square millimeter thin wires are connected at one end to one end of the thermistor and at the other end to the temperature detection interface set on the charging motherboard. The plug temperature detection interface is connected to the MCU main control circuit module, which uses an STC8H1K16 chip.
[0008] Furthermore, the LED indicator panel is equipped with a power indicator, a connection / charging indicator, a device / line fault indicator, a voltage / current abnormality indicator, a temperature abnormality indicator, and a pause / resume operation button.
[0009] Furthermore, the CP detection and modulation circuit utilizes the electric vehicle charging protocol. First, it confirms the connection with the electric vehicle through the CC connection protocol, and then controls and guides the CP to realize the connection, charging, full charge, disconnection, and restart states of the charging device with the vehicle.
[0010] In summary, this utility model has the following beneficial effects: It features a simple structure, reasonable design, and intelligent and convenient use, effectively managing and protecting electricity consumption. It has a self-test function upon power-on, uses a thermistor on the plug to detect contact heating temperature, and uses an internal temperature chip to detect the internal temperature, controlling the operating environment temperature. Voltage transformers, current transformers, and neutral current transformers are used to detect and monitor electricity consumption; a microcontroller enables LED panel display and data acquisition, analysis, and processing; and a relay module enables on / off management. Combined with the monitored data, the charging process is managed. This intelligent electric vehicle charging box meets the needs for safe, environmentally friendly, healthy, and convenient electricity use. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the electric vehicle charging cable of this utility model; Figure 2 This is a schematic diagram of the charging box of this utility model; Figure 3 This is a schematic diagram of the internal structure of the bottom shell of this utility model; Figure 4 This is a schematic diagram of the LED indicator panel of this utility model; Figure 5 This is a schematic diagram of the internal PCB circuit module of this utility model; Figure 6 This is a schematic diagram of the charging circuit structure of this utility model; Figure 7 This is a schematic diagram of the CC connection circuit at the charging gun end of this utility model; Figure 8 This is a schematic diagram of the circuit of the charging gun plug part of this utility model; In the diagram: 1. Top shell; 2. Bottom shell; 3. LED indicator panel; 4. Pause / resume operation button; 5. Power cord input port; 6. Power cord output port; 7 (7A, 7B, 7C, 7D, 7E, 7F), bottom mounting holes; 8. Wire groove; 9. Charging main board; 10A. Input terminal block; 10B. Output terminal block; 11. Relay on / off circuit module; 12. Zero-sequence current detection circuit module; 13. MCU main control circuit module; 14. Voltage detection circuit block; 15. Surge protection circuit block; 16. Plug temperature detection module; 17 (17A, 17B, 17C, 17D, 17E, 17F), PCB screw fixing holes; 18. Internal temperature detection module; 19. Current detection circuit module; 20. CP detection modulation circuit module; 21. AC-DC conversion module; G16. Power plug; E16. Charging gun; 22. Plug; 23. Thermistor. Detailed Implementation
[0012] The present invention will be further described in detail below with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described. 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 protection scope of the present invention.
[0013] like Figures 1-5 As shown, an electric vehicle charging management box includes a power cord input port 5, an LED indicator panel 3, an upper shell 1, and a bottom shell 2. The LED indicator panel 3 is disposed on the surface of the upper shell 1. The bottom shell 2 has a rectangular elliptical space with a wire pressing groove 8 inside. The bottom of the bottom shell 2 has multiple bottom mounting holes 7. A charging motherboard 9 is disposed in the upper and lower shell space. The upper end of the charging motherboard 9 has an input terminal 10A. The input terminal 10A is electrically connected to the three pins 22 of the power plug G16 through the power cord input port 5 via a power cord. The power plug G16 has a plug temperature detection module 16 for monitoring temperature inside. The lower end of the charging motherboard 9 has an output terminal 10B. The output terminal 10B is electrically connected to the charging gun end E16 of the power cord through the power cord output port 6 via a wire. The charging motherboard 9 integrates an internal temperature detection module 18.
[0014] Furthermore, such as Figure 5 As shown, the motherboard 9 integrates a relay on / off circuit module 11, a zero-sequence current detection circuit module 12, an MCU main control circuit module 13, a voltage detection circuit module 14, a surge protection circuit module 15, a plug temperature detection module 16, an internal temperature detection module 18, a current detection circuit module 19, a CP detection modulation circuit 20, and an AC-DC conversion module 21.
[0015] Furthermore, the zero-sequence current detection circuit module 12 senses the current difference between the live L line and the neutral line through the zero-sequence coil to determine whether there is leakage; the voltage detection circuit module 14 detects the voltage level in the circuit through a voltage transformer to achieve high voltage and undervoltage protection; the current detection circuit module 19 detects the current through a current transformer to achieve overcurrent protection and determine the charging status; the surge protection circuit module 15 adopts a varistor-type discharge circuit to protect the equipment from damage caused by surges; the internal temperature detection module 18 uses a DS18B20 temperature sensor to detect the internal temperature. When the temperature is higher than 70.5 degrees, charging stops, and when the temperature drops to 65 degrees, charging resumes to protect the equipment from damage caused by overheating; the relay on / off circuit module 11 uses a high-current relay to charge the electric vehicle through a management method; the MCU main control circuit module 13 collects information from each circuit module, analyzes the data, and issues processing instructions to the relays in the relay on / off circuit; controls the relay on / off and provides corresponding status or fault indications to the LED indicator panel 3.
[0016] Preferably, the power plug end G16 adopts the new national standard 16A three-core plug, and the shell connects to a household 16A national standard socket. The power cord charging gun end E16 has a CC charging identification resistor inside, and also has a CP connection terminal, which can be connected to the electric vehicle through protocol handshake, realizing the connection between the charging box and the electric vehicle, and the identification and management of charging, charging pause and charging completion status.
[0017] Furthermore, the CP detection modulation circuit module 20 utilizes the electric vehicle charging protocol. First, it confirms the connection with the electric vehicle through the CC connection protocol, and then controls and guides the CP detection modulation circuit to realize the connection, charging, full charge, disconnection, and restart of the charging device with the vehicle.
[0018] Furthermore, such as Figure 8 As shown, the plug temperature detection module 16 includes a 10K thermistor 23 built into the power plug G16. The thermistor 23 is clipped into the mounting slot of the power plug G16. The power plug G16 has three 1.5 square millimeter wires. One end of the three wires is used to connect to the live (L), neutral (N), and ground (PE) pins 22, and the other end is connected to the input terminal 10A. Two 0.5 square millimeter thin wires are connected at one end to one end of the thermistor 23, and the other end is connected to the temperature detection interface set on the charging motherboard 9. The plug temperature detection interface is connected to the MCU main control circuit module 13, which uses a chip of model STC8H1K16.
[0019] Specifically, the working principle of the plug temperature detection module 16 is as follows: During the plug charging process, after the plug itself contacts the user's socket, heat is generated between the plug and the socket due to the large current. Especially when it is not plugged in properly or the contact area of the socket is insufficient, a contact resistance is formed, and the heat generated will be even greater. The heat is transferred through the plastic to the 10K NTC thermistor, causing the thermistor's resistance to decrease. The resistance value is connected to the temperature detection interface set on the charging motherboard 9 through the wire and transmitted to the MCU main control circuit module 13. The MCU detects different resistance values and determines the current temperature based on the NTC resistor value. Thus, it identifies the input point temperature at the plug. When the detected temperature is higher than the set temperature of 75 degrees, the MCU will notify the control relay module to disconnect the device charging to avoid adverse consequences caused by insufficient contact between the plug and the socket leading to overheating.
[0020] Electrical input ● No electricity Connected ● ● No electricity Charging ● ○ Electric Charging complete ● ■ No electricity pause ● □ No electricity Equipment / line failure ● ■ No electricity Voltage / current anomalies ● ■ No electricity Temperature anomaly ● ■ No electricity Flashing light instructions: ● Green light is always on; ○ Green light is flashing; ■ Red light is always on; □ Red light is flashing.
[0021] Working principle: Connect the product's power plug G16 to an AC power outlet to power on the charging case. (Refer to...) Figure 6 and Figure 7 First, the 220V AC mains power is converted into 12V and 5V power supplies by the AC-DC conversion module 21 to power the various circuit modules and the MCU chip. After the circuit is running normally, it enters the environmental monitoring phase. The MCU control circuit module 13 operates, and the MCU chip STC8H1K16 analyzes the resistance value of the thermistor in the power plug G16 and reads the temperature sensor data in the internal temperature detection circuit module 18. At the same time, it detects the difference in current between the live wire and the neutral wire induced by the neutral wire coil in the zero-sequence current detection circuit module 12 to determine if there is a leakage current. It also detects the voltage transformer in the voltage detection circuit module 14 to determine if there is an undervoltage or overvoltage condition. The current transformer in the current detection circuit module 19 detects the current in the current circuit to determine if there is an overcurrent phenomenon. After the above basic parameters are monitored, the MCU main control circuit module performs judgment and analysis. If there is no abnormality, indicator light 3 lights up, indicating that the power supply is normal. If there is a fault, the corresponding fault light will light up.
[0022] After power-on monitoring, the product can insert the charging gun end E16 of the plug into the car charging port. This utility model charging box first determines whether it is connected to the electric vehicle charging port through the E16 charging gun end via the CC connection circuit. The 3B indicator light turns green to indicate a successful connection. Then, the MCU chip detects the handshake protocol in the CP detection modulation circuit. If it is determined that the electric vehicle needs charging, the MCU, together with the CP detection modulation circuit, modulates the corresponding pulse wave to achieve the charging protocol and start charging. The 3B indicator light turns green at a frequency of 1HZ to indicate that charging is in progress. When the charging reaches saturation, the MCU control circuit, together with the CP detection modulation circuit, modulates a new corresponding pulse wave to achieve the charging completion protocol. The 3B indicator light turns red to indicate that charging is complete.
[0023] Throughout the entire charging process and its subsequent use, the charging box is constantly protected by the surge protection circuit module 15 to prevent damage from shock waves. Simultaneously, the coordination between various circuits ensures that when the MCU control circuit 13 detects that the plug temperature is higher than the set temperature via the plug's thermistor, the 3E indicator lights up; or when the internal ambient temperature is higher than the set temperature via the temperature sensor in the internal temperature detection circuit module 18; or when leakage is detected by the zero-sequence current detection circuit 12, the 3C indicator lights up; or when undervoltage or overvoltage is detected by the voltage detection circuit 14, the 3D indicator lights up; or when overcurrent is detected by the current detection circuit 19, the 3E indicator lights up; and when the charging connection and charging status are determined to be disconnected via the CC connection circuit and the modulation detection circuit 20, the MCU analyzes these abnormalities and transmits instructions to the live / zero double-break relay circuit to disconnect the power supply, thus protecting the charging equipment. When the faults described above, such as temperature, voltage, and current, are restored, and the MCU control circuit module 13 detects that all parameters are normal, the MCU chip will work with the CP detection modulation circuit module 20 to modulate different duty cycles and reach a handshake agreement with the electric vehicle to recharge.
[0024] This utility model discloses an electric vehicle charging management box. During use, it intelligently controls and protects the charging equipment by detecting key point temperatures, voltage, current, and leakage current, ensuring that the charging process can be carried out in a safe environment and effectively guaranteeing the safety of electricity use.
[0025] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.
Claims
1. An electric vehicle charging management box, characterized in that: The device includes a power cord input port (5), an LED indicator panel (3), an upper shell (1), and a bottom shell (2). The LED indicator panel (3) is located on the surface of the upper shell (1). The bottom shell (2) has a rectangular elliptical space with a wire pressing groove (8) inside. The bottom of the bottom shell (2) has multiple bottom mounting holes (7). A charging motherboard (9) is located in the space between the upper and lower shells. The upper end of the charging motherboard (9) has an input terminal (10A). The input terminal (10A) is electrically connected to the three pins (22) of the power plug (G16) through the power cord input port (5) via a power cord. The power plug (G16) has a plug temperature detection module (16) for monitoring temperature inside. The lower end of the charging motherboard (9) has an output terminal (10B). The output terminal (10B) is electrically connected to the power cord charging gun end (E16) through the power cord output port (6) via a wire. The charging motherboard (9) integrates an internal temperature detection module (18).
2. The electric vehicle charging management box according to claim 1, characterized in that: The motherboard (9) also integrates a relay on / off circuit module (11), a zero-sequence current detection circuit module (12), an MCU main control circuit module (13), a voltage detection circuit module (14), a surge protection circuit module (15), a current detection circuit module (19), a CP detection modulation circuit (20), and an AC-DC conversion module (21).
3. The electric vehicle charging management box according to claim 2, characterized in that: The zero-sequence current detection circuit module (12) senses the current difference between the live L line and the neutral line through the zero-sequence coil, thereby determining whether there is a leakage phenomenon; the voltage detection circuit module (14) detects the voltage level in the circuit through the voltage transformer to realize high voltage and undervoltage protection. The current detection circuit module (19) detects the current through a current transformer to achieve overcurrent protection and charging status determination; the surge protection circuit module (15) adopts a varistor-type discharge circuit to protect the equipment from damage caused by surges; the internal temperature detection module (18) uses a DS18B20 temperature sensor to detect the internal temperature; the relay on / off circuit module (11) uses a high-current relay to charge the electric vehicle through a management method; the MCU main control circuit module (13) collects the information collected by each circuit module, performs data analysis, and issues processing instructions to the relays in the relay on / off circuit module (11); controls the relay on / off and provides corresponding status or fault indications to the LED indicator panel (3).
4. The electric vehicle charging management box according to claim 3, characterized in that: The plug temperature detection module (16) includes a 10K thermistor (23) built into the power plug (G16). The thermistor (23) is installed in the mounting slot of the power plug (G16). The power plug (G16) has three 1.5 square millimeter wires. One end of the three wires is used to connect to the pins (22) of the live (L), neutral (N), and ground (PE) wires, and the other end is connected to the input terminal (10A). Two 0.5 square millimeter thin wires are connected to one end of the thermistor (23) and the other end is connected to the temperature detection interface set on the charging motherboard (9). The plug temperature detection interface is connected to the MCU main control circuit module (13). The MCU main control circuit module (13) uses a chip of model STC8H1K16.
5. The electric vehicle charging management box according to claim 4, characterized in that: The LED indicator panel (3) is equipped with a power indicator (3A), a connection / charging indicator (3B), a device / line fault indicator (3C), a voltage / current abnormal indicator (3D), a temperature abnormal indicator (3E), and a pause / resume operation button (4).