Noise reduction in an on-line battery impedance measurement system

  • US 5,821,757 A
  • Filed: 05/20/1997
  • Issued: 10/13/1998
  • Est. Priority Date: 05/20/1997
  • Status: Expired due to Fees
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First Claim
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1. In a system for monitoring the condition a string of serially connected battery cells, the battery cells being divided into a plurality of groups of at least two adjacent cells in the string, the system including measurement circuitry, connections to the battery cells and a controllable switch coupled via conductors between the measurement circuitry and the connections, wherein the switch is controllable to couple in sucession each of the groups of battery cells to the measurement circuitry, a method for reducing induced differential currents in conductors connected between the battery cells and the switch, the method comprising the steps of:

  • (a) providing insulated conductors;

    (b) for each of said groups of adjacent battery cells, connecting first ends of respective insulated conductors to each end of the serial string of adjacent battery cells in said each group and to each intermediate junction of the serial string of adjacent battery cells in said each group;

    (c) for each of said groups of adjacent battery cells, bundling together all of the associated insulated conductors; and

    (d) for each of said groups of adjacent battery cells, connecting the other ends of the associated insulated conductors to the switch;

    wherein for connecting each group of adjacent battery cells to the switch there is one more associated insulated conductor than there are adjacent battery cells in said each group.

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