US 12,451,524 B2
Electrode assembly, secondary battery, battery pack and vehicle including the same
Kwan-Hee Lee, Daejeon (KR); and Duk-Hyun Ryu, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/281,260
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Aug. 1, 2022, PCT No. PCT/KR2022/011313
§ 371(c)(1), (2) Date Sep. 8, 2023,
PCT Pub. No. WO2023/014018, PCT Pub. Date Feb. 9, 2023.
Claims priority of application No. 10-2021-0103378 (KR), filed on Aug. 5, 2021; and application No. 10-2022-0089230 (KR), filed on Jul. 19, 2022.
Prior Publication US 2024/0145783 A1, May 2, 2024
Int. Cl. H01M 10/0587 (2010.01); H01M 50/531 (2021.01); H01M 50/566 (2021.01)
CPC H01M 10/0587 (2013.01) [H01M 50/531 (2021.01); H01M 50/566 (2021.01); H01M 2220/20 (2013.01)] 43 Claims
OG exemplary drawing
 
1. An electrode assembly defining a core and an outer circumferential surface by winding a positive electrode, a negative electrode, and a separator interposed therebetween around a winding axis,
wherein the positive electrode or the negative electrode comprises a current collector having a sheet-shape that has a long side and a short side, the current collector further having an uncoated portion at an end of the long side,
wherein the uncoated portion comprises an electrode tab defined section used as an electrode tab by itself and at least one electrode tab undefined section not used as an electrode tab,
wherein a maximum current path for the at least one electrode tab undefined section comprises a widthwise direction current path along the short side of the current collector and a lengthwise direction current path along the long side of the current collector, and a current path ratio L2/L1 is approximately 2.57 to approximately 8.5 when lengths of the lengthwise direction current path and the widthwise direction current path are L2 and L1, respectively,
wherein the uncoated portion comprises a second portion adjacent to the outer circumferential surface, and
wherein a height of the second portion is gradually decreased toward the outer circumferential surface.