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Battery system with cell voltage detecting units

  • US 9,921,270 B2
  • Filed: 08/12/2011
  • Issued: 03/20/2018
  • Est. Priority Date: 09/14/2010
  • Status: Active Grant
First Claim
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1. A battery system, comprising:

  • an evaluation unit;

    an analog-to-digital converter;

    a communication bus connected to the evaluation unit;

    an auxiliary voltage source configured to provide a predetermined voltage having a predefined magnitude and frequency, the predetermined voltage being known to the evaluation unit;

    a multiplexer having an output and a plurality of selectable inputs, the output being connected via the analog-to-digital converter to the communication bus, at least one of the plurality of selectable inputs being connected to the auxiliary voltage source, the multiplexer being configured to provide the predetermined voltage to the communication bus via the analog-to-digital converter; and

    at least one battery module including a plurality of battery cells, each battery cell of the plurality of battery cells having an associated cell voltage sensing circuit configured to a sense cell voltage of the respective battery cell, each the cell voltage sensing circuit being connected to at least one of the plurality of selectable inputs of the multiplexer,wherein the evaluation unit is configured to;

    receive, on the communication bus, digitized values of the sensed cell voltages of the plurality of battery cells;

    detect, on the communication bus, digitized values of the predetermined voltage provided by the auxiliary voltage source;

    determine that the analog-to-digital converter is not properly functioning in response to the digitized values of the predetermined voltage no longer being detected on the communication bus; and

    determine that the analog-to-digital converter is not properly functioning in response to the digitized values of the predetermined voltage detected on the communication not having the predefined magnitude and frequency.

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