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Method for detecting the voltage in battery cells

  • US 8,860,422 B2
  • Filed: 01/14/2010
  • Issued: 10/14/2014
  • Est. Priority Date: 01/23/2009
  • Status: Active Grant
First Claim
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1. A method for detecting the voltage in battery cells of a battery system, which are connected in series, having the steps of:

  • applying a current, which has a continuous plot in some sections, to a series circuit of resistors, the series circuit of resistors including a respective resistor for each one of the battery cells whose voltage is being detected, each of the battery cells being associated with one of the resistors;

    coupling a first battery terminal located at a first end of each of the battery cells whose voltage is being detected to a first terminal of the associated resistor and coupling a second terminal of the associated resistor to a first input of a comparator associated with the battery cell;

    coupling a second battery terminal located at a second end of the each of the battery cells whose voltage is being detected to a second input of the comparator associated with the battery cell;

    comparing a first voltage received at the first input of each comparator to a second voltage received at the second input of the comparator, the first voltage corresponding to a voltage at the first battery terminal of the associated battery cell which is dropped across the associated resistor, the second voltage corresponding to a voltage at the second battery terminal of the associated battery cell; and

    deriving a voltage of a respective battery cell from the comparison based on a time at which the voltage drop at the resistor associated with it corresponds to, exceeds, or falls below the voltage of the respective battery cell and based on the plot of the current that has a continuous plot in some sections.

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