US 12,355,028 B2
Secondary battery and device including the same
Ansoo Jeong, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/639,205
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Sep. 1, 2020, PCT No. PCT/KR2020/011676
§ 371(c)(1), (2) Date Feb. 28, 2022,
PCT Pub. No. WO2021/075710, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 10-2019-0129946 (KR), filed on Oct. 18, 2019.
Prior Publication US 2022/0328859 A1, Oct. 13, 2022
Int. Cl. H01M 10/04 (2006.01); H01M 10/0587 (2010.01); H01M 50/538 (2021.01)
CPC H01M 10/0431 (2013.01) [H01M 10/0587 (2013.01); H01M 50/538 (2021.01); H01M 2220/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a jelly-roll type electrode assembly in which a first electrode sheet, a second electrode sheet are wound with a separator interposed between the first electrode sheet and the second electrode sheet, the first electrode sheet having an active material layer and an uncoated portion; and
a first electrode tab joined to the uncoated portion of the first electrode sheet and positioned at a central portion of the jelly-roll type electrode assembly,
wherein the first electrode tab includes a joining portion joined to the uncoated portion and an extension portion extended outward from the joining portion,
wherein a width of the joining portion is wider than a width of the extension portion,
wherein the joining portion is wound ¾ times or more and once or less in the central portion of the jelly-roll electrode assembly,
wherein the extension portion extends across an upper side of the uncoated portion, and
wherein the joining portion is separated from the upper side of the uncoated portion.