Battery monitor circuit

  • US 4,316,185 A
  • Filed: 07/17/1980
  • Issued: 02/16/1982
  • Est. Priority Date: 07/17/1980
  • Status: Expired due to Term
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First Claim
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1. A battery monitor circuit for a multicell rechargeable battery having a high voltage terminal and a reference terminal at opposite ends and an intermediate terminal that divides the cells of the battery into two groups comprising:

  • a. resistive voltage divider coupled across said high voltage and reference terminals, said voltage divider comprising first and second large resistance components joined by a relatively small third resistance component, a first voltage magnitude being derived from the junction of said first and third resistance components, and said second voltage magnitude being derived from the junction of said second and third resistance components, said first and second voltage magnitudes defining the limits of a voltage range;

    b. means for coupling to said intermediate terminal so as to provide a third voltage magnitude corresponding to the voltage between said intermediate and reference terminals, said first and second voltage magnitudes being nominally offset to either side of said third voltage magnitude; and

    c. comparison means including1. a first comparator network responsive to said first and third voltage magnitudes for detecting battery cell low impedance deterioration in one group of cells and high impedance deterioration in the other group of cells;


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