On-line battery impedance measurement

  • US 5,281,920 A
  • Filed: 08/21/1992
  • Issued: 01/25/1994
  • Est. Priority Date: 08/21/1992
  • Status: Expired due to Term
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First Claim
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1. In combination with a battery system having at least one string of serially connected rechargeable battery cells and charging means connected across said at least one string for charging said battery cells, an arrangement for measuring the impedance of said battery cells without disconnecting said battery cells from said battery system, the arrangement comprising:

  • means for providing connections across groups of said battery cells, each of said groups being within a respective single string and including at least one battery cell;

    load means for conducting electrical current;

    first switching means coupled between said load means and at least one predetermined point in each of said at least one string, said at least one predetermined point dividing said each string into at least two portions, there being at least one of said groups of cells within each of said portions within said each string;

    second switching means coupled to said connections;

    voltage measuring means coupled to said second switching means; and

    control means coupled to said first and second switching means for controlling said first switching means to couple said load means in succession across each portion of said each string and for controlling said second switching means to couple said voltage measuring means in succession across each of the groups of cells within the portion of said each string to which the load means is coupled at that time.

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