futureofai / ennoid-bms

Open-Source: Modular BMS based on LTC68XX & STM32 MCU for up to 400V EV battery pack

ENNOID - BMS

ENNOID-BMS is an open-source configurable battery management system consisting of a Master board based on an STM32 microcontroller connected through an ISOSPI interface to several modular slave boards. ENNOID-BMS can monitor the specifics temperatures, currents & voltages that are critical for any lithium-ion battery packs. Based on the monitored inputs & the configured parameters, the master board can allow or interrupt the flow of energy from the battery pack by switching the state of external heavy-duty contactors. ENNOID-BMS can measure each cell voltage level & can trigger the passive balancing function during charging for cells above the configured limit to ensure that all cells have a similar State-Of-Charge (SOC). Parameters can be configured through the ENNOID-BMS-Tool software running on a USB connected host computer.

Ordering:

For ordering assembled BMS or battery packs, please visit:

https://www.ennoid.me/bms/gen-1

Documentation:

https://blog.ennoid.me/

Block diagram

The evolution of the BMS can be followed on this thread:

https://endless-sphere.com/forums/viewtopic.php?f=14&t=92952

Features:

• Modular with master/slave topology
• 12S, 15S & 18S slaves board options
• Master board options: High Voltage (Master-HV) & Low voltage (Master-LV)
• Up to 500A continuous operation
• Integrated bi-directional current sensor
• 12V drive coil outputs for charge, discharge & auxiliary circuits
• Communication between slaves & master through a two-wire daisy chained ISOSPI interface
• Isolated CAN bus interface
• Isolated charger detection circuit
• Voltage measurement for battery pack & load
• Build-in precharge circuits
• USB interface for programming and firmware upgrades through an easy to use graphical user interface
• OLED Display, serial output & power button
• 0V to 5V cell voltage operation

Documentation:

ENNOID-BMS Datasheet

Software:

ENNOID-BMS GUI configuration tool: ENNOID-BMS tool

Firmware:

ENNOID-BMS firmware .bin file: ENNOID-BMS.bin

View this project on CADLAB.io.