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Firmware Stable

Features

BMS1 is a stand-alone device tightly coupled with the battery, providing a stable power source for the rest of the system.

It does not require any external power sources or power-on sequencing. It actively maintains the battery at all times — performing periodic checkups, continuous balancing, SOC and SOH estimation, and storage mode management — while providing system-wide protection without any external circuitry. Combined with automatic wake/sleep management, this makes the resulting battery pack maintenance-free and ready to embed in a demanding traction system.

Power stage​

  • Dual-port architecture with separate control and current measurement for each port
  • True short-circuit breaking with ~1 µs reaction time and capacitive short-circuit energy discharge circuitry
  • Integrated triggerable fuse for safety in the case of transistor shoot-through
  • High-precision bidirectional current measurement on both ports
  • Triple battery voltage measurement (cells, pack, ports)
  • Individually configurable bidirectional short-circuit protection for both ports (up to 850 A)
  • High continuous discharge current (±250 A), ±500 A peak
  • High continuous charge current (100 A), 200 A peak
  • Capacitive, resistive, and combined load pre-charging with controllable current
  • Ready for series daisy-chaining with synchronized circuit breaking to reach 400V system demand

Sleep management​

  • Low sleep current (<1 mA)
  • Ultra-low deep-sleep current (<50 µA), with wake by charger or calendar events
  • Ports can remain ON during sleep and be woken by load (~>20 mA)
  • Multiple wake sources (CAN, negative current draw, charger detection, button, KEY input, timer)
  • All protections remain active during sleep

Temperature management​

  • Multiple integrated temperature sensors (balancer, switch)
  • 2 external temperature inputs (NTC or PTC, selectable via parameter)

Cell management​

  • Individual undervoltage and overvoltage protection with cell health measurement
  • Detection of correct cell connection
  • Proportional control of balancing current with balancer temperature sensing
  • Simultaneous balancing on all cells, possible in all operational modes

Environment sensing​

  • Humidity and pressure measurement
  • Heatsink potential measurement

Communication​

  • CAN — galvanically isolated
  • UART — galvanically isolated
  • USB-C — for debugging and tuning

Outputs​

  • Contactor drive output with PWM for disconnecting BATT+ in the off state

Inputs​

  • Dedicated KEY input for vehicle on/off control
  • Dedicated charge-detect input signal

Firmware highlights​

  • SOC and SOH estimation with advanced multi-input state observer (coulomb counting, voltage, temperature). siliXcon can provide model setup for different cells
  • Always-on RTC for event logging
  • Overload, overvoltage, undervoltage, and overtemperature protections
  • Configurable limit values (min, max) for all measurands, with separate thresholds for derating and port shutdown
  • CAN streaming of immediate derating requirement for both current directions (for motor controller use)
  • Periodic battery checks in sleep mode with automatic storage mode entry (discharge and deep sleep)
  • Part of the siliXcon platform with seamless cooperation with siliXcon controllers
  • Self-diagnostics
  • Detection of correct load and charger connection
  • Series daisy-chaining of complete packs

Accessories​

  • OLED display with button
  • RGB LED bar