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Cell voltage abnormality detector and cell voltage monitoring device for a multi-cell series battery

  • US 8,154,253 B2
  • Filed: 09/12/2008
  • Issued: 04/10/2012
  • Est. Priority Date: 09/14/2007
  • Status: Active Grant
First Claim
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1. A cell voltage abnormality detector for a multi-cell series battery made up of plural battery cells connected in series that is used to detect cell voltage abnormalities in at least a single cell of the multi-cell series battery comprising:

  • a selection switch for selecting any of the at least single cells of said multi-cell series battery and retrieving cell voltage from between first and second monitoring terminals;

    a cell voltage/monitoring current converter, which has a first transistor connected between said first and second monitoring terminals and which converts the voltage of said battery cell selected by said selection switch into a monitoring current;

    a monitoring current/monitoring voltage converter, which has a second transistor that, in combination with said first transistor, forms a current mirror circuit, and which converts the monitoring current generated by said cell voltage/monitoring current converter into a monitoring voltage; and

    a comparison/evaluation circuit, which compares said monitoring voltage obtained by said monitoring current/monitoring voltage converter with a prescribed reference voltage and which determines whether the voltage of said battery cell selected by said selection switch is outside of a predetermined normal range.

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