Patent ID: 11923517
Assignee: SK ON CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  A  Y | IPC H

Claim 5:
6. An energy storage system comprising: a battery rack;
a cooling device configured to cool battery cells included in the battery rack;
a battery fire detection device configured to determine whether there is a risk of fire or whether a fire occurs in the battery cell included in the battery rack; and
a battery management system configured to execute a fire coping measure when there is a battery cell at risk of fire or in which a fire has occurred therein,
wherein the battery fire detection device comprises:
a first sensor configured to detect whether a gas vent of the battery cell is opened;
a second sensor configured to detect a temperature of the battery cell; and
a controller configured to determine whether there is a risk of fire or whether a fire occurs in the battery cell based on detection results of the first sensor and the second sensor,
wherein, in response to the gas vent of the battery cell being opened, the controller determines a temperature and a temperature change of the battery cell after the gas vent is opened, and determines whether there is a risk of fire or whether a fire occurs in the battery cell based on the temperature and the temperature change of the battery cell after the gas vent is opened,
wherein, in response to the temperature of the battery cell being decreased by more than or equal to a second temperature for a first period of time after the gas vent is opened while the temperature of the battery cell is equal to or higher than a first temperature, the controller determines that the battery cell is at risk of fire or that a first has occurred therein.