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BMS Controller


The Dilithium Design Battery Management System is a modular BMS designed for Electric Vehicle applications. The BMS is implemented as two assemblies. The BMS Controller (BMSC), consists of the BMS Processor and a measurement board in a single enclosure. The BMS Satellite (BMSS) contains a BMS measurement board. The BMS Controller is a standalone 24 cell BMS, and up to three BMS Satellites may be added, resulting in 48, 72, and 96 cell systems. 

The BMS measurement board has been optimized for monitoring cells in large lithium packs and was designed to minimize power consumption, especially during long-term storage where battery drain is unacceptable. 

The BMSC diagnostics verify proper functioning of measurement circuitry, verify cell wiring, and monitor for communication errors. In operation, all cells in the system are measured approximately 8 times per second to millivolt precision.

During operation, the BMS collects pack and cell statistics. Statistics include high and low cell watermark data which can be used to track cell performance under load, and standard deviation which measures pack balance.

The BMSC supports several alert conditions. When operating, an alert is generated if any cell drops below the configurable Low Voltage Cutoff (LVC) threshold. When charging, an alert is generated over canbus or loop outputs if any cell rises above the High Voltage Cutoff (HVC) threshold. A connected charge controller (EVCC) can respond to these alerts to disable charging. 

The BMS supports an option for cell balancing. Each cell is compared to the pack cell voltage average and a group of balancing candidates is continuously re-evaluated. Cell balancing occurs for selected cells only when above a configurable voltage.

The BMSC case is roughly 5 3/8" x 3 3/8" and 1 1/8" tall.

Note: Serial Cable is required for system initialization and custom configuration (included if selected above). Purchase additional BMS Satellites (BMSS 24) for packs larger than 24 cells.

Support Documentation

Quick-Start Guide
Manual version2.2
Manual Version2.1
Manual version2.0
External Switching Diagrams
BMS Wiring and Testing Video

Included Components

  • BMS Controller with 24-cell internal measurement board
  • Two 12-Cell measurement harnesses
  • Low voltage Connector and wiring 
  • Wire release tool for connectors
  • 12-Cell test board
  • 12v Light/Buzzer (for operator alert)

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