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BATTERY PACK FOR CORDLESS POWER TOOLS

  • US 20080238370A1
  • Filed: 11/20/2006
  • Published: 10/02/2008
  • Est. Priority Date: 10/28/2005
  • Status: Active Grant
First Claim
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1. A battery pack of a cordless power tool system including a power tool and a charger, the pack removably attachable to the tool and charger, the battery pack comprising:

  • a housing,a plurality of battery cells within the housing,a battery electronic control unit within the housing for controlling the charger during a charge of the cells, and for controlling a field effect transistor (FET) during discharge operations to control current to a motor of the power tool,a first voltage monitoring unit for monitoring one or both of individual cell voltages and total stack voltage in the pack during charge and discharge operations, anda second voltage monitoring circuit for separately monitoring individual cell voltage to detect any cell reaching an over-voltage condition during a charge.

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