US 12,406,978 B2
Secondary battery and method for manufacturing the same
Mi Jung Yoo, Daejeon (KR); Young Hoon Lee, Daejeon (KR); Min Jung Kim, Daejeon (KR); and Woo Yong Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on Mar. 4, 2022, as Appl. No. 17/686,576.
Application 17/686,576 is a continuation of application No. PCT/KR2020/011916, filed on Sep. 4, 2020.
Claims priority of application No. 10-2019-0110276 (KR), filed on Sep. 5, 2019; and application No. 10-2020-0112507 (KR), filed on Sep. 3, 2020.
Prior Publication US 2022/0190310 A1, Jun. 16, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 50/107 (2021.01)
CPC H01M 4/0435 (2013.01) [H01M 4/0471 (2013.01); H01M 50/107 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A method for manufacturing a secondary battery, the method comprising:
an electrode assembly preparation step of preparing an electrode assembly which has a structure, in which electrodes and separators are alternately disposed, and on which flat top and bottom surfaces are formed;
a first pressing step of pressing the top and bottom surfaces of the electrode assembly by using a first pressing device, on which first and second curved surfaces are formed, to form third and fourth curved surfaces, which have shapes corresponding to that of the first and second curved surfaces formed on the first pressing device, on the top and bottom surfaces of the electrode assembly, respectively;
an accommodation step of accommodating the electrode assembly, on which the third and fourth curved surfaces on the top and bottom surfaces of the electrode assembly are formed, in a pouch type exterior in which a cup having a concave shape is formed; and
a second pressing step of pressing the third and fourth curved surfaces of the top and bottom surfaces of the electrode assembly and an outer surface of the pouch type exterior by using a second pressing device on which fifth and sixth curved surfaces are formed,
wherein a pressure of pressing the electrode assembly in the first pressing step is higher than a pressure of pressing the electrode assembly and the pouch type exterior in the second pressing step.