8. Battery management system


Battery management system (BMS)

  • The electric traction battery is a relatively sensitive system.
  • To maintain durability, it must be supplemented by a comprehensive electronic system.
  • BMS in particular:
    • Monitors the voltage and temperatures of individual cells / groups of cells
    • Monitors the amount of energy received and consumed
    • Balances articles
    • Controls charging - communicates with the charging system
    • Limits / enables max. Current
    • Models cells, battery
    • Estimates SoC, SoH
    • It communicates with the control units in the car




    Cell balancing
    • Each cell has slightly different parameters.
    • Differences in SoC occur when charging series-connected cells.
    • Cell balancing is necessary



    Frequent terms

    • BMS – Battery management system
    • SoC – State of Charge
    • SoH – State of Health
    • DoD – Depth of Discharge




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