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Battery management system for a cordless tool

  • US RE45,897 E1
  • Filed: 11/05/2014
  • Issued: 02/23/2016
  • Est. Priority Date: 04/14/2008
  • Status: Active Grant
First Claim
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1. A tool comprising:

  • an output head;

    a motor operatively connected to the output head;

    a resistance sensor that measures the output head'"'"'s resistance to movement; and

    a controller connected to the motor and the resistance sensor, the controller being constructed and arranged to connect to a plurality of battery cells,wherein the controller is constructed and arranged to connect the plurality of battery cells to each other and the motor in series, and subsequently automatically connect the plurality of battery cells to each other in parallel and to the motor when the resistance sensed by the resistance sensor exceeds a predetermined shift resistance.

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