×

Method for detecting battery thermal events via battery pack isolation monitoring

  • US 8,168,315 B1
  • Filed: 08/23/2011
  • Issued: 05/01/2012
  • Est. Priority Date: 08/23/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method of detecting and responding to a cell failure of at least one cell of a plurality of cells comprising a battery pack, the method comprising the steps of:

  • periodically monitoring an electrical isolation resistance of said battery pack;

    comparing said electrical isolation resistance to a preset resistance value;

    determining when said electrical isolation resistance falls below said preset resistance value, wherein said electrical isolation resistance falling below said preset resistance value is indicative of said cell failure;

    monitoring a battery pack temperature;

    determining when said battery pack temperature exceeds a preset temperature;

    determining if said electrical isolation resistance falling below said preset resistance occurs within a preset time period of said battery pack temperature exceeding said preset temperature; and

    performing a predetermined cell failure response if said electrical isolation resistance falling below said preset resistance value occurs within said preset time period of said battery pack temperature exceeding said preset temperature.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×