US 12,424,667 B2
Secondary battery and device including the same
Jeongbeom Lee, Daejeon (KR); Jong Keon Yoon, Daejeon (KR); and Hoejin Hah, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/770,195
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Sep. 16, 2020, PCT No. PCT/KR2020/012510
§ 371(c)(1), (2) Date Apr. 19, 2022,
PCT Pub. No. WO2021/118020, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 10-2019-0165769 (KR), filed on Dec. 12, 2019.
Prior Publication US 2022/0393249 A1, Dec. 8, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 50/107 (2021.01); H01M 50/538 (2021.01)
CPC H01M 10/0587 (2013.01) [H01M 50/107 (2021.01); H01M 50/538 (2021.01)] 9 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
an electrode assembly having a jelly roll structure including a positive electrode sheet, a negative electrode sheet and a separator;
a cylindrical case in which the electrode assembly is received; and
a flat spiral spring positioned between an outer peripheral surface of the electrode assembly and an inner surface of the cylindrical case,
wherein the flat spiral spring is configured such that a first end contacts the electrode assembly, a second end contacts the inner surface of the cylindrical case, and the flat spiral spring wraps the electrode assembly one or more times,
wherein a positive electrode tab attached to the positive electrode sheet is extended upward from the electrode assembly,
wherein a negative electrode tab attached to the negative electrode sheet is extended downward from the electrode assembly, and
wherein a contact point of the first end of the flat spiral spring on the electrode assembly coincides with at least one of the positive electrode tab or the negative electrode tab in a radial direction of the electrode assembly.