The development of a smart Battery Management System (BMS) for Electric Vehicles (EVs) is essential to ensure safe, efficient, and reliable operation of the battery pack. This project focuses on designing a BMS using the Texas Instruments BQ6925 IC, which offers advanced features like cell balancing, overvoltage, undervoltage protection, and temperature monitoring. The system integrates an Arduino microcontroller to facilitate real-time monitoring and control, interfacing with various components including an LCD display for data visualization and a temperature sensor for detecting thermal variations in the battery cell. The BMS ensures that the battery operates within safe voltage and temperature ranges, providing optimal performance while protecting against potential hazards such as overheating or overcharging. The LCD display presents key data such as battery voltage, temperature, charge status, and any alerts for system malfunctions. The project offers a scalable and cost-effective solution to enhance EV battery management, ensuring longer battery life and improved overall vehicle performance.

 

Objectives:

• Battery Health Monitoring: To design and implement a smart BMS using the BQ6925 IC to monitor the health of the EV battery by tracking parameters such as
• Current.
• Cell voltage.
• Temperature.
• Overvoltage.
• Undervoltage.
• Overtemperature.
• Overcurrent.
• Cell imbalance.
• State of charge.
• State of health.

Overvoltage and Undervoltage Protection: To develop an intelligent system that uses the BQ6925 IC to detect and protect against overvoltage and undervoltage conditions, preventing battery damage and ensuring optimal charging/discharging cycles.

Real-Time Data Display: To integrate an LCD display with an Arduino microcontroller for real-time visualization of critical battery data, including voltage, current, temperature, and charge status, providing valuable information for the user and enhancing battery management.

Temperature Monitoring and Control: To implement a temperature sensor for accurate monitoring of the battery pack's temperature, with the aim to avoid overheating or thermal runaway, thereby ensuring the safety and longevity of the battery.

  The major building blocks of this project are:

• Regulated power supply
• ARDUINO UNO Microcontroller.
• BQ76925 BMS IC.
• Temperature sensor.
• 1-Li-Ion Battery cell.
• LCD display.

Software’s used:

• Embedded C programming.
• Arduino UNO for dumping code into Micro controller.
• Express SCH for Circuit design.

       

     

Block diagram:  

   

     

 

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