US 12,091,725 B2
Method of manufacturing cylindrical battery case having reduced surface roughness
Kwang Su Hwang Bo, Daejeon (KR); Je Jun Lee, Daejeon (KR); Sang Sok Jung, Daejeon (KR); Jun Tak Kim, Daejeon (KR); Gil Young Lee, Daejeon (KR); and Seong Mo Koo, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 16/606,613
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Oct. 23, 2018, PCT No. PCT/KR2018/012565
§ 371(c)(1), (2) Date Oct. 18, 2019,
PCT Pub. No. WO2019/083254, PCT Pub. Date May 2, 2019.
Claims priority of application No. 10-2017-0137092 (KR), filed on Oct. 23, 2017; and application No. 10-2018-0126665 (KR), filed on Oct. 23, 2018.
Prior Publication US 2020/0335736 A1, Oct. 22, 2020
Int. Cl. C21D 9/48 (2006.01); B21D 22/20 (2006.01); B21D 35/00 (2006.01); C23C 30/00 (2006.01); H01M 50/119 (2021.01); H01M 50/124 (2021.01); H01M 50/131 (2021.01); H01M 50/133 (2021.01)
CPC C21D 9/48 (2013.01) [B21D 22/201 (2013.01); C23C 30/005 (2013.01); H01M 50/119 (2021.01); H01M 50/124 (2021.01); H01M 50/131 (2021.01); H01M 50/133 (2021.01); B21D 35/002 (2013.01); Y10T 29/49108 (2015.01)] 5 Claims
OG exemplary drawing
 
1. A method of manufacturing a cylindrical battery case, comprising: performing an ironing process a plurality of times when performing a deep-drawing process for forming an outer circumferential surface of a body of the battery case,
wherein performing the ironing process a plurality of times comprises:
performing a primary ironing process when performing a deep-drawing process for forming the body of the battery case, and
performing a secondary ironing process when performing a deep-drawing process for forming a step portion at the battery case, and
wherein a thickness of the battery case is reduced by the same amount during each of the plurality of times the ironing process is performed.