Data detection and power-off protection device applied to automobile charging pile

Abstract

The utility model discloses a data detection and power-off protection device applied to an automobile charging pile. The data detection and power-off protection device comprises a main controller, a composite sensing detection module, an impedance detection module, a leakage protection module, a voltage conversion module and a communication module, the main controller is Raspberry Pi 5; the composite sensing detection module comprises a temperature sensor, a voltage sensor, a current sensor and an SOC + SOH sensor; the impedance detection module is an AD5940 module; the electric leakage protection module is combined with a BMS for real-time monitoring, and is powered off in time through an SCR; the voltage conversion module is formed by combining an ACDC module and a DCDC module; the communication module is Air724UG, interacts with the Raspberry Pi 5 through a UART, and transmits data to a cloud platform through an MQTT protocol.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent detection, and in particular to a data detection and power-off protection device applied to a car charging pile. Background Art

[0002] Against the backdrop of increasingly severe global environmental problems, new energy vehicles, as a clean, low-carbon means of transportation, have been strongly supported and promoted by governments around the world. Under this trend, the global new energy electric vehicle market is booming, and market penetration is increasing. However, power batteries have defects such as easy thermal runaway and poor cell consistency, which affect the safety of new energy vehicles when charging, and even cause spontaneous combustion in severe cases.

[0003] The health status of the battery is related to factors such as the ambient temperature and pressure. Most of the existing new energy power battery testing devices have inaccurate detection data, complicated detection processes, and are unable to record the entire process of dynamic changes in charging in real time, resulting in an unknown charging process and difficulty in preventing sudden damage to the power battery and spontaneous combustion in time. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a data detection and power-off protection device for automobile charging piles, which is applied to the intelligent detection of power batteries and solves the problems of complex detection process, inaccurate detection data, inability to record the entire process of dynamic changes of charging in real time, unknown charging process, and difficulty in preventing emergencies in time.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A data detection and power-off protection device for a car charging pile, comprising a main controller, a composite sensor detection module, an impedance detection module, a leakage protection module, a voltage conversion module, a communication module, and equipped with a BMS communication protocol;

[0007] The main controller is a Raspberry Pi 5, the impedance detection module is AD5940, and the composite sensing detection module includes a temperature sensor, a voltage sensor, a current sensor, and a SOC+SOH sensor;

[0008] The leakage protection module is combined with BMS real-time monitoring to cut off power in time through SCR;

[0009] The voltage conversion module is composed of a combination of ACDC and DCDC modules;

[0010] The communication module is Air724UG, which interacts with Raspberry Pi 5 via UART and transmits to the cloud platform via MQTT protocol.

[0011] Preferably: the temperature sensor is BME280, the voltage sensor is ZMPT101B, the current sensor is ACS758LCB-100B, and the above three communicate with the main controller through the SPI protocol; the ZMPT101B and ACS758LCB-100B both transmit the collected signals to MCP3008, and MCP3008 transmits them to the main controller through SPI communication; the SOC+SOH sensor is a BQ34Z100 chip, and the above two communicate with the main controller through the IIC protocol.

[0012] Preferably, the voltage conversion module adopts a combination of an ACDC module and a DCDC module to reduce the impact of excessive noise during the conversion process and convert high-voltage AC power into a stable DC 5V voltage.

[0013] As a preferred embodiment: the leakage protection module is combined with BMS real-time monitoring, and the power is cut off in time through SCR; this process uses a contactless switch as an execution device to achieve a rapid power-off effect.

[0014] Preferably, the communication module is Air724UG, which transmits the data detected in real time during the charging process to the cloud platform through the MQTT protocol, and the cloud platform temporarily stores and transfers the above data.

[0015] Compared with the prior art, it has the following beneficial effects:

[0016] The traditional single sensor has been improved to form a composite sensing detection module, which can accurately measure temperature, voltage, current, SOC, and SOH. The main controller uses Raspberry Pi 5 to process the complex data detected by the composite sensing detection module, providing strong performance while maintaining low power consumption, and promptly and quickly transmitting power-off and danger warning signals to the leakage protection module and Air724UG respectively. In order to solve the problem of excessive noise during the conversion process, the ACDC module and the DCDC module are combined to switch to a stable DC 5V voltage to power the main controller.

[0017] The leakage protection module used is combined with BMS real-time monitoring. After judgment by the main controller, it sends a command to the SCR. The SCR contactless switch is used as an execution device to perform power-off protection, timely block safety hazards, and achieve rapid leakage protection effect.

[0018] In addition, the impedance detection module is AD5940, which is used to identify the quality of connector contact, detect the connection status of the charging plug, and monitor the electrical characteristics of the charging device, and promptly reflect the situation where the charging plug is not connected properly.

[0019] The Air724UG communication module is used to interact with the main controller through UART, and the data detected in real time during the charging process is transmitted to the cloud platform through the MQTT protocol. The cloud platform temporarily stores and transfers the above data; based on the cloud platform, a series of safety standard data of the dynamic charging process of the power battery are collected, which can be accurately compared with the data transmitted by Air724UG in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the utility model from a top view;

[0022] Figure 3 This is a structural diagram of the utility model after adding a shell.

[0023] In the figure: 1. Temperature sensor BME280; 2. SOC+SOH sensor BQ34Z100; 3. ADC model conversion module MCP3008; 4. Voltage sensor ZMPT101B; 5. Impedance detection module AD5940; 6. 4G communication module AIR724UG; 7. Current sensor ACS758LCB-100B; 8. Conversion module combining ACDC and DCDC; 9. Main controller Raspberry Pi 5; 10. SCR leakage protection module. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0025] Example 1: See Figure 1 and Figure 2 , a data detection and power-off protection device for automobile charging piles, including a main controller 9, a composite sensing detection module, an impedance detection module 5, a leakage protection module 10, a voltage conversion module 8, and a communication module 6; the main controller is a Raspberry Pi 5 9; the composite sensing detection module includes a temperature sensor 1, a voltage sensor 4, a current sensor 7, and a SOC+SOH sensor 2; the impedance detection module is an AD5940 5; the leakage protection module 10 is combined with BMS real-time monitoring, and the power is cut off in time through SCR; the voltage conversion module 8 is composed of ACDC and DCDC modules; the communication module is Air724UG 6, which interacts with the Raspberry Pi 5 9 through UART and transmits to the cloud platform through the MQTT protocol. The utility model has high adaptability, uses a composite sensing module to monitor the dynamic charging process in real time, cooperates with the single-phase thyristor leakage protection module 10 to protect the circuit from powering off in time, timely reflects the charging connection through impedance detection, and timely transmits data through MQTT.

[0026] In this embodiment, the voltage conversion module 3 adopts a combination of an ACDC module and a DCDC module to reduce the impact of excessive noise in the conversion process and convert high-voltage AC power into a stable DC 5V voltage; the leakage protection module 10 is combined with BMS real-time monitoring to cut off power in time through SCR. This process uses a contactless switch as an execution device to achieve a quick power-off effect; the communication module is Air724UG 6, which transmits the data detected in real time during the charging process to the cloud platform through the MQTT protocol, and the cloud platform temporarily stores and transfers the above data.

[0027] The utility model can be installed on different types of charging piles according to actual needs. In this embodiment, it is preset to be installed on the public AC charging pile with the highest appearance rate. Figure 2 , the intelligent detection and protection multifunctional module used in new energy vehicle charging piles is installed inside the pile body and tightly connected to the charging gun terminal socket.

[0028] The working principle of the utility model is:

[0029] Through the voltage conversion module 8, the ACDC module and the DCDC module are combined to reduce the voltage and reduce the excessive noise in the conversion process, convert the high-voltage AC into a stable DC 5V voltage, and provide stable power to the main controller. The composite sensor detects the state of the charging pile gun line supplying power to the new energy vehicle, collects data such as temperature, voltage, current, SOC and SOH, and then transmits the dynamic real-time data to the Raspberry Pi 5 9 through the SPI and IIC communication protocols, and the main controller makes a judgment.

[0030] If the voltage exceeds 220V by more than 15%, the current exceeds 63A, the temperature exceeds room temperature by more than 10%, etc., the main controller makes a judgment and controls the contactless switch SCR through GPIO to start the fast power-off mode. The action time of the actuator is less than 2ms, and the full power-off time is less than 5ms, achieving the fastest power-off and protecting the charging pile itself and the power battery of the new energy vehicle being charged to the greatest extent. At the same time, the main controller also transmits information to the 4G communication module Air724UG6 through UART, and Air724UG 6 transmits the real-time status data of the charging process and the alarm information of dangerous situations to the cloud platform via the MQTT protocol.

[0031] The impedance detection module AD5940 5 works before the charging pile starts to work and starts to discharge, identifies the quality of the connector contact, and detects the connection status of the charging plug. When it is detected that the impedance is too large, AD5940 5 transmits it to the main controller 9 through GPIO. After the main controller 9 responds, it sends a signal to Air724UG 6 through the serial port. Air724UG then transmits it to the cloud platform through the MQTT protocol. The cloud platform reports the data to the user, and the user resets the charging plug in time to ensure the normal charging status.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A data detection and power-off protection device for a car charging pile, comprising a main controller, a composite sensor detection module, an impedance detection module, a leakage protection module, a voltage conversion module, a communication module, and equipped with a BMS communication protocol, characterized in that: The main controller is a Raspberry Pi 5, the impedance detection module is AD5940, and the composite sensing detection module includes a temperature sensor, a voltage sensor, a current sensor, and a SOC+SOH sensor; The leakage protection module is combined with BMS real-time monitoring to cut off power in time through SCR; The voltage conversion module is composed of a combination of ACDC and DCDC modules; The communication module is Air724UG, which interacts with Raspberry Pi 5 via UART and transmits to the cloud platform via MQTT protocol.

2. According to claim 1, a data detection and power-off protection device for a car charging pile is characterized in that: The temperature sensor is BME280, the voltage sensor is ZMPT101B, and the current sensor is ACS758LCB-100B. The above three communicate with the main controller through the SPI protocol; the ZMPT101B and ACS758LCB-100B both transmit the collected signals to MCP3008, and MCP3008 transmits them to the main controller through SPI communication; the SOC+SOH sensor is a BQ34Z100 chip, and the above two communicate with the main controller through the IIC protocol.

3. The data detection and power-off protection device for a car charging pile according to claim 1 is characterized in that: The voltage conversion module adopts a combination of an ACDC module and a DCDC module to reduce the impact of excessive noise in the conversion process and convert high-voltage AC power into a stable DC 5V voltage.

4. The data detection and power-off protection device for a car charging pile according to claim 1 is characterized in that: The leakage protection module is combined with BMS real-time monitoring to cut off power in time through SCR; This process uses a contactless switch as the actuator to achieve a quick power-off effect.

5. The data detection and power-off protection device for a car charging pile according to claim 1 is characterized in that: The communication module is Air724UG, which transmits the data detected in real time during the charging process to the cloud platform through the MQTT protocol, and the cloud platform temporarily stores and transfers the above data.

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