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SWITCH FAILURE DETECTION DEVICE, BATTERY PACK INCLUDING THE SAME, AND METHOD OF DETECTING FAILURE OF ELECTRONIC SWITCH

  • US 20130229186A1
  • Filed: 02/28/2013
  • Published: 09/05/2013
  • Est. Priority Date: 03/01/2012
  • Status: Active Grant
First Claim
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1. A switch failure detection device to be installed in an electric system including an electric storage device, the switch failure detection device comprising:

  • at least one electronic switch to be connected in a path in which a charging current to the electric storage device and a discharging current from the electric storage device flow and switched between on and off;

    at least one rectifier configured to pass a discharging current by bypassing the electronic switch when the electronic switch is turned off;

    a switch voltage detection circuit configured to detect a voltage between an input and an output of the at least one electronic switch; and

    a controller configured to;

    determine whether the electric storage device is in a discharging state;

    send an off-command signal to the at least one electronic switch to turn off the at least one electronic switch if the electric storage device is in the discharging state;

    receive the voltage detected by the switch voltage detection circuit while the off-command signal is sent to the at least one electronic switch;

    determine an input-output voltage of the at least one electronic switch based on the voltage;

    determine whether the input-output voltage is lower than a reference voltage; and

    determine the at least one electronic switch has a turn-off problem in which the at least one electronic switch does not turn off according to the off-command signal if the input-output voltage is lower than the reference voltage.

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