US 11,717,916 B2
Cylindrical battery and method of manufacturing same
Ryunosuke Yokoo, Hyogo (JP); and Kazumichi Shimizu, Osaka (JP)
Assigned to Panasonic Energy Co., Ltd., Osaka (JP)
Appl. No. 16/981,442
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Feb. 18, 2019, PCT No. PCT/JP2019/005859
§ 371(c)(1), (2) Date Sep. 16, 2020,
PCT Pub. No. WO2019/187776, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-069526 (JP), filed on Mar. 30, 2018.
Prior Publication US 2021/0066697 A1, Mar. 4, 2021
Int. Cl. H01M 10/04 (2006.01); H01M 50/536 (2021.01); B23K 26/02 (2014.01); H01M 50/534 (2021.01)
CPC B23K 26/02 (2013.01) [H01M 10/04 (2013.01); H01M 50/534 (2021.01); H01M 50/536 (2021.01)] 2 Claims
OG exemplary drawing
 
1. A cylindrical battery comprising:
an electrode body in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween; and
a bottom-closed cylindrical exterior package can which receives the electrode body,
wherein a lead connected to one of the positive electrode and the negative electrode is extended from the electrode body and is welded to a bottom potion of the exterior package can, and
when the bottom portion is viewed from the outside of the exterior package can, an entirety of a welding portion between the lead and the bottom portion formed by a molten mark is formed outside of a concentric circle of the bottom portion having a diameter equivalent to the width of the lead orthogonal to a direction extended from the electrode body, and
the welding portion includes three or more welding portions each formed in a straight line shape along a radius direction of the bottom portion.
 
2. A method for manufacturing the cylindrical battery according to claim 1,
wherein, of two end surfaces of the electrode body orthogonal to a winding axis thereof, on one end surface opposite to the welding portion, a marking which indicates a position of the lead facing the other end surface is displayed, and while the marking is detected, energy beams are radiated from the outside of the bottom portion to a part of the bottom portion which faces the lead to form the welding portion.