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Safety device for managing batteries

  • US 7,157,881 B1
  • Filed: 12/02/2005
  • Issued: 01/02/2007
  • Est. Priority Date: 12/02/2005
  • Status: Active Grant
First Claim
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1. A safety device for balancing a plurality of cells or groups of cells connected in series, or in parallel and in series, comprising:

  • a. a controller assembly comprising an analog controller and a digital controller with the plurality of cells or groups of cells connected in series;

    b. a disconnect circuit, comprising a charge switch and a discharge switch connected in series, engaging the controller assembly and the plurality of cells or groups of cells connected in series;

    c. a pack sensing circuit comprising a member selected from the group consisting of a means for measuring temperature, a means for measuring current, and a means for measuring cell voltages; and

    wherein the pack sensing circuit connects to the controller assembly and the plurality of cells or groups of cells connected in series;

    d. a balancing circuit comprising a shunt resistor connected to a by-pass switch, wherein the balancing circuit connects between the plurality of cells or groups of cells connected in series and engages the controller assembly; and

    e. computer instructions for instructing the controller assembly within the safety device to control the disconnect circuit and the balancing circuit; and

    wherein the plurality of cells or groups of cells connected in series are balanced when operating in a charging phase, a discharging phase, a quiescent phase, and a storage phase.

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