A PCM (Protection Circuit Module) is a circuit board which is made to protect the battery. PCMs are found in rechargeable Lithium battery packs. PCMs differ from BMS’ (Battery Management Systems) in terms of the features they offer. They offer protection systems but do not offer the additional features like balancing, SOC monitoring (state of charge), SOH (state of health), communication bus etc.

This circuit board has the following protective features:

  • Overvoltage cut off
  • Under-voltage cut off
  • Overload
  • Overheating