Battery pack BMS: CANbus, RS485, I2C, SMBus
The Battery Management System protects the pack and, when the host must read data, talks the protocol the equipment already uses. ENERGIVM designs the BMS with the pack — CANbus, RS-485, I2C or SMBus — from Rubí, for EU industrial equipment.
What a BMS does
The BMS cuts on over-charge, over-discharge, over-current, short-circuit and out-of-range temperature, and it balances state of charge between cells. On lithium it is not optional: a pack without a BMS is a risk. Protection first; communication only when the host needs it.
When CANbus vs RS485
CANbus is the usual choice when the host is a vehicle, an AGV or an industrial controller that already speaks CAN. RS-485 is common on inverters, rectifiers and site controllers. I2C and SMBus appear on compact electronics. We match the protocol the equipment already uses — we do not invent a new bus for the host.
Integration with the pack
The BMS is specified with the cell configuration, the connector and the thermal envelope, not as a bolt-on after the pack exists. We integrate and assemble the pack in Rubí; we do not manufacture the cell. When the host must read voltage, current or state of charge, the same design pass adds CANbus, RS-485, I2C or SMBus.
How we spec it
Specs first (what the battery powers, load, autonomy, space, connector, temperature), then the protocol the host already uses, then a prototype. We reply within 24 hours. Prototypes take from a few days to two months, depending on the mechanical and electronics work.
Frequently asked questions
What is a BMS in a custom battery pack?
The Battery Management System protects the pack: it cuts on over-charge, over-discharge, over-current, short-circuit and out-of-range temperature, and it balances cells. On lithium it is not an accessory. ENERGIVM designs it with the pack in Rubí.
When do you need CANbus?
When the host equipment must read the pack and already speaks CAN — typical on traction, AGVs and industrial controllers. If the host is an inverter or a rectifier, RS-485 is more common. The protocol follows the equipment, not the other way around.
Can you design the BMS and the pack together?
Yes. The BMS is developed with specialist engineering to the protocol your equipment already uses, at the same time as the cell configuration, the enclosure and the connector. That is the custom-pack brief we work from in Rubí.