US 11,923,517 B2
Battery fire detection device and method, and energy storage system
Suk Chul Kim, Daejeon (KR); Dae Won Kwon, Daejeon (KR); Yong Uk Kim, Daejeon (KR); and Jong Ho Seok, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR)
Filed on Nov. 12, 2021, as Appl. No. 17/525,578.
Claims priority of application No. 10-2020-0151359 (KR), filed on Nov. 12, 2020.
Prior Publication US 2022/0149449 A1, May 12, 2022
Int. Cl. H01M 10/48 (2006.01); H01M 10/42 (2006.01); H01M 50/143 (2021.01)
CPC H01M 10/486 (2013.01) [H01M 10/4207 (2013.01); H01M 50/143 (2021.01)] 11 Claims
OG exemplary drawing
 
1. A battery fire detection device comprising:
a first sensor configured to detect whether a gas vent of a 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 more than or equal to a first temperature, the controller determines that the battery cell is at risk of fire or that a fire has occurred therein.