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Batteries for use in implantable medical devices

  • US 10,543,303 B2
  • Filed: 09/22/2017
  • Issued: 01/28/2020
  • Est. Priority Date: 11/08/2013
  • Status: Active Grant
First Claim
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1. A system for over-charge protection of a multi-cell battery pack when one of the cells has been disconnected, the system comprising:

  • a circuit comprising N cells, each cell having a maximum voltage V, wherein each cell comprises;

    a fuel gauge configured to monitor a value of a parameter of the cell;

    a first transistor controlled by the fuel gauge, the first transistor configured to close when the value meets a threshold, thereby disconnecting the cell from the circuit; and

    a unit configured to sense a voltage across the cell and to cause a second transistor to close to bypass the cell when the voltage is greater than a threshold and to open when the voltage is smaller than the threshold, thereby preventing the multi-cell battery pack from charging past the voltage of V(N−

    1).

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