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Disconnection detecting device

  • US 8,269,460 B2
  • Filed: 06/08/2010
  • Issued: 09/18/2012
  • Est. Priority Date: 06/25/2009
  • Status: Active Grant
First Claim
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1. A disconnection detecting device for a battery including battery blocks each constructed by series-connected unit cells, the device being configured to detect a disconnection of an electrical wire that connects a connection point of an adjacently-connected pair of a higher-ordered battery block and a lower-ordered battery block to a ground terminal of a voltage detection unit configured to detect a voltage between both ends of a unit cell belonging to the higher-ordered battery block and to a power supply terminal of a voltage detection unit configured to detect a voltage between both ends of a unit cell belonging to the lower-ordered battery block, the device comprising:

  • a switch element configured to decrease an impedance of the voltage detection unit that detects the voltages between both ends of the unit cells belonging to the higher-ordered battery block; and

    a disconnection detecting unit configured to detect the disconnection of the electrical wire based on a voltage between both ends of a lowest-ordered unit cell of the higher-ordered battery block, the voltage between both ends being detected by the voltage detection unit while the switch element is turned on.

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