US 11,843,099 B2
Method and system for extracting electrolyte in lithium secondary battery by freezing and cutting the secondary battery
Rin Jang, Daejeon (KR); Jeong Ae Ahn, Daejeon (KR); Junghyun Song, Daejeon (KR); and Byoung Hyoun Kim, Daejeon (KR)
Assigned to LG Energy Solution, Ltd.
Filed by LG Chem, Ltd., Seoul (KR)
Filed on Apr. 9, 2021, as Appl. No. 17/226,811.
Claims priority of application No. 10-2020-0047202 (KR), filed on Apr. 20, 2020; and application No. 10-2020-0182332 (KR), filed on Dec. 23, 2020.
Prior Publication US 2021/0328282 A1, Oct. 21, 2021
Int. Cl. H01M 10/54 (2006.01); B01D 11/02 (2006.01); G01N 1/42 (2006.01); G01N 1/04 (2006.01); G01N 24/08 (2006.01)
CPC H01M 10/54 (2013.01) [B01D 11/0288 (2013.01); G01N 1/04 (2013.01); G01N 1/42 (2013.01); G01N 24/08 (2013.01)] 12 Claims
OG exemplary drawing
 
11. A system for extracting an electrolyte solution in a secondary battery, comprising:
(i) a chamber for accommodating the secondary battery and securing the secondary battery in a set position;
(ii) an injection unit included in the chamber to supply liquid nitrogen to the chamber to freeze the secondary battery to a frozen state; and
(iii) a cutter for cutting the secondary battery in the frozen state, wherein the cutter is included in the chamber and the cutter is configured to be movable up and down while being spaced apart from the injection unit,
wherein the system is configured to calculate a total amount of an electrolyte solution extracted from the frozen cut secondary battery with respect to a total size of the secondary battery from a content of the extracted electrolyte solution, and then to determine a ratio of the total amount of the electrolyte solution to a content of the electrolyte solution used in manufacturing the secondary battery to obtain extraction efficiency.