4s BMS PowerSafe®

Description technique

Cells management

  • Management of 4 lithium cells in series, compatible with all cell technologies (NMC, LiFe, LiPo…)
  • Management of 3 NTC temperature sensors
    • 2 digital measurements used by the software
    • 1 analog measurement used by the hardware redundancy
  • Measurements accuracy:
    • Cell voltages: +/- 5 mV
    • Temperatures: +/- 1°C


  • Hardware redundancy for voltage and temperature measurements in order to reach a high level of safety (SIL2 of EN61508 standard)
  • Overcharge and undercharge, tunable by software
  • Overtemperature and undertemperature, tunable by software
  • Overcurrent: 2 levels in discharge, 1 level in charge tunable by software
  • Short circuit hardware protection (resettable electronic fuse)


  • Passive balancing with a 500 mA bypass current per cell (on the BMS)

Power box

  • Requires an external power box (contactors, hall effect current sensor)
  • Bidirectional measurement of the battery current with an external hall effect sensor
  • Power box management up to 750 A:
    • Management of up to 3 external electromechanical contactors
    • Precharge circuit included on the BMS

Smart functions

  • SOC and SOH calculation
  • Advanced self-diagnostic of the board
  • Communication by CAN bus 2.0B
    • Possibility to manage the motor controller and the charger
  • Advanced supervision software
  • Black box integrated with defaults history storage and life counters

Power supply/consumption

  • Supply of the BMS directly on the battery pack
  • Low consumption in sleep mode: < 500 μA

Mechanical format

  • 66 mm x 213 mm x 22 mm
  • Can be potted to be used in harsh environment.