BMSafe is a multi-chemistry open source battery management system (BMS) designed for safety critical systems like EVs.

It uses a master/slave topology, communicating via a high speed CAN link.

PCBs are designed in Eagle, code is written in C, IDE used is CodeWarrior, and ICs are Freescale and Linear.

Documentation is coming soon (in redaction).

Originally developed at the École Polytechnique de Montréal.

Contact us, if you are interested by the product, have questions or suggestions !

Features:

• 4 to 12 cells/slave module (not tested with less than 12 cells)
• 12 thermistors/slave (for temperature measurement)
• Isolated High Speed CAN 2.0 Communication
• Isolated USB/RS232 (BMS master)
• Passive balancing
• Cell voltage range: 0 to 5V
• CAN termination available on each circuit (unpopulated whe unused)
• Easy slave connectivity (daisy-chain)
• Relay (MCR, precharge and charge) control
• Compatible with Brusa NLG5 chargers (CAN controlled charging)
• Many security features (software and hardware)
• Slaves are directly powered by the cells
• Master can be powered by an external voltage source from 7 to 36V
• Temperature measure range (-40 to 140˚C)
• Hall effect current measurement (not implemented yet)
• State of charge (SOC) calculation (not implemented yet)