US 12,287,373 B2
Method for determining remaining capacity of lithium-sulfur battery, and battery pack implementing same method
Bong Soo Kim, Daejeon (KR); Dongseok Shin, Daejeon (KR); and Taek Gyoung Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION LTD., Seoul (KR)
Appl. No. 17/926,919
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Oct. 20, 2021, PCT No. PCT/KR2021/014719
§ 371(c)(1), (2) Date Nov. 21, 2022,
PCT Pub. No. WO2022/086175, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 10-2020-0136625 (KR), filed on Oct. 21, 2020.
Prior Publication US 2023/0251321 A1, Aug. 10, 2023
Int. Cl. G01R 31/38 (2006.01); G01R 31/36 (2020.01); G01R 31/3842 (2019.01); G01R 31/388 (2019.01); G01R 31/396 (2019.01)
CPC G01R 31/3842 (2019.01) [G01R 31/3648 (2013.01); G01R 31/388 (2019.01); G01R 31/396 (2019.01)] 12 Claims
OG exemplary drawing
 
1. A method for determining a remaining capacity of a lithium-sulfur battery, the method comprising the steps of:
a) measuring an initial voltage drop value dV1 in an open-circuit state at any one point within 0.01 second to 0.3 second after applying a constant current to the lithium-sulfur battery;
b) measuring a late voltage drop value dV2 in the open-circuit state at any one point within 0.5 second to 20 seconds after applying the constant current to the lithium-sulfur battery,
c) computing an additional voltage drop value dV3 according to Equation 1:
dV3=dV2−dV1;  [Equation 1]
d) computing a value of X according to Equation 2:
X=dV1−dV3; and  [Equation 2]
e) determining the remaining capacity of the lithium-sulfur battery from the value of X.