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Abnormality diagnosis device and method for battery pack

  • US 7,332,891 B2
  • Filed: 06/18/2003
  • Issued: 02/19/2008
  • Est. Priority Date: 06/26/2002
  • Status: Active Grant
First Claim
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1. An abnormality diagnosis device for a battery pack comprising a plurality of parallel blocks, each of which comprises a plurality of cells connected in parallel, and which are themselves connected in series, comprising:

  • a voltage detection device which detects a voltage of each parallel block of the battery pack; and

    an abnormality determination device which performs a diagnosis of abnormality of the cells connected in parallel within each parallel block, based upon an amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, whereinthe abnormality determination device obtains the amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, and determines that an abnormal cell is included in the parallel block if the amount of charge of the voltage of the parallel block is greater than a predetermined value.

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