S2 BMS Controller

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The S2 BMS controller is designed for low to medium voltage lithium-ion battery systems and supports 2 separate cell banks. Each cell bank can have 4-12 cells in series, for a total of 8-24 cells.

 

Originally developed for use in electric vehicles, the S2 controller’s standalone design is highly configurable for many different applications. Features include built in relay control, an isolated CAN bus and isolated RS-232 for communications, 6 configurable digital or analog inputs/outputs, redundant hardware safety disconnect, voltage and temperature monitoring for every lithium-ion cell, and a battery output current sensor.

 

There is an S-Series model comparison on the S-Series page. To read more about this model, download the S-Series data sheet.

Intelligent Monitoring

  • All cell voltages and temperatures
  • Battery pack current
  • Dynamic State of Charge (SOC) and State of Health (SOH) algorithms adapt to aging cells
  • Capacity and DC resistance calculations
  • Over 80 fault conditions monitored at all times
  • Configurable alarm levels

Efficient Design

  • Dual-layer safety architecture (hardware and software)
  • Automotive grade components
  • Extremely low power dissipation
  • 300 mA passive cell balancing
  • IP55 protection rating
  • Isolated CAN bus channel
  • Configurable inputs and outputs

Comprehensive Data Management

  • Cell lifetime data recorded in controller memory
  • Integrated BMS Link software for your laptop or PC allows you to:
    • Monitor and export data
    • Control your battery pack directly
    • Diagnose problems

    Parameter

    Value

    Supply Voltage

    9–32 V

    Number of Cells

    4–24

    Battery Voltage

    up to 110 V

    Cell Voltage Monitoring and Hardware Interlock

    Measurement Resolution

    1.5 mV

    Measurement Gain Error

    ±0.12 %

    Range

    0–5 V

    Measurement Period

    50 ms

    Cell Temperature Monitoring

    Cell Temperature Measurement Resolution

    0.1 °C

    Cell Temperature Measurement Accuracy

    1.0 %

    Cell Temperature Measurement Range

    -100–100 °C

    Cell Balancing

    Passive Balancing Current

    250–300 mA

    Current Sensor

    Automotive dual-range Hall effect sensor

    Communications

    Isolated CAN Bus

    1

    CAN Bus (diagnostic)

    1

    Isolated RS-232

    1

    I/O

    High-Power Driver (1 A)

    2

    Digital Input/Output (750 mA)

    4

    Digital Input/Output (750 mA) OR
    Analog Output (0–5 V)

    2