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The Battery Condition Monitor Module (BCM) monitors the condition of the main battery, via four temperature sensors and 10 voltage sensors in the Battery Module. It also uses one current sensor to determine rate of charge/discharge, and supplies information to the Motor Control Module.

The BCM maintains the IMA battery state of charge in a range of 20% to 80%, which optimizes battery life. It never allows the battery to become fully charged or fully discharged.

The Battery Condition Monitor also controls the operation of the 2-speed cooling fan, located on the outside of the battery module. Relays and a resistor that make two different speeds possible, are located on the Junction Board. the Battery Condition Monitor checks the condition of the battery by monitoring the following:

  • Calculation of State of Charge (SOC)
  • Battery protection needs
  • Battery temperature

 

 
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