Advanced LiFePO4 Battery Management System (20S10P)

This project is an advanced Battery Management System (BMS) designed for a 20-series 10-parallel LiFePO4 battery pack. The system features: 20 temperature sensors to monitor individual cell temperatures. Active cell balancing using high-power resistors to equalize cell voltages. Coulomb counting to estimate battery pack health over time. Efficient communication via a custom SPI-like system using a single ATmega328P microcontroller, decoders, multiplexers, and shift registers, allowing monitoring of cell voltages, temperatures, and pack current using only three analog pins. Electronic charge detection unit, which signals the microcontroller when the pack is connected to charge, enabling current tracking and storage in EEPROM. Protection features, including overvoltage and overcurrent cutoff (max 64V, 180A) to safeguard the battery pack. This BMS demonstrates a full integration of electronics, embedded systems, and power management for large LiFePO4 packs. Due to commercial value, design and schematic files cannot be shared publicly.