Battery Management System (BMS)

The IQ System is an advanced Battery Management System (BMS) for any type of lithium-chemistry battery packs. It is comprised of a single battery pack master controller connected to multiple cell management modules. The units function together to protect and control the entire battery pack.

Without the BMS a high voltage battery pack is at risk of operating outside of specified limits, potentially leading to complete failure of the individual cells. The Prohelion BMS eliminates this risk, by reliably monitoring each cell and maintaining operation within the set limits. It can also completely disconnect the battery pack if any voltage or temperature limit is exceeded.

The IQ BMS is a full battery management system, not just a battery monitoring system. During the charge cycle the Prohelion BMS is capable of bypassing fully charged cells – providing a top-of-charge balance for the entire battery pack and overcoming cell differences due to age and manufacturing variations.


A reliable, proven architecture based on 20 years of solar car learnings and race tested in events around the world


Software and battery management solutions developed and used by experienced solar car racers

Battery Management Unit (BMU)

The BMU is a bridge between the CMUs and the vehicle communication bus. It controls the pre-charge and main contactors of the battery pack as well as collating the telemetry data from the nodes and providing a summary to other components on the vehicle CAN bus.

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BMU Specifications

  • Communications: CAN bus to both batteries and vehicle
  • Contactor Drive: 3x 12V 3A, with feedback
  • Precharge: Resistive (includes fault detection)
  • Isolation Rating: 1kV DC
  • Dimensions: 195 x 55 x 30mm
  • Mass: 150g
  • Environmental: No enclosure — coated PCB

Cell Management Unit (CMU)

The Prohelion CMU suits any lithium cell chemistry of any form factor, as the threshold voltages are user-configurable, and a simple wiring harness is used to connect the node to the cells.

Each node can monitor between one and eight cells, and is powered from the network, not the cells themselves, so the BMS itself does not contribute to cell leakage and imbalance.

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CMU Specifications

  • Cell options: Any lithium chemistry cell
  • Communications: CAN bus (ribbon cable)
  • Balance current:250mA
  • Voltage resolution1mV
  • Update rate: Full pack @ 1Hz, MinV/MaxV @ 100HzMax system32 nodes, 256 cells, 1000V
  • Battery wiring: Simple point-point ribbon, 1-8 cells
  • Fault detection: Redundant voltage sense, cross checked A/D reference, comms timeouts
  • Temp accuracy: 2°C
  • Isolation Rating: 1kV DC
  • Dimensions: 135 x 55mm (250mA node)
  • Mass: 35g
  • Environmental: No enclosure — coated PCB

Additional Documentation