US 12,407,047 B2
Battery and method of manufacturing same
Hiroyuki Nakayama, Okazaki (JP); Takeyuki Ozaki, Seto (JP); and Kohji Umemura, Okazaki (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 28, 2021, as Appl. No. 17/563,609.
Application 17/563,609 is a division of application No. 16/655,941, filed on Oct. 17, 2019, abandoned.
Claims priority of application No. 2018-197011 (JP), filed on Oct. 18, 2018.
Prior Publication US 2022/0123393 A1, Apr. 21, 2022
Int. Cl. H01M 50/176 (2021.01); H01M 50/55 (2021.01); H01M 50/553 (2021.01); H01M 50/562 (2021.01); H01M 50/566 (2021.01)
CPC H01M 50/176 (2021.01) [H01M 50/55 (2021.01); H01M 50/553 (2021.01); H01M 50/562 (2021.01); H01M 50/566 (2021.01)] 6 Claims
OG exemplary drawing
 
1. A method of manufacturing a battery, comprising the steps of;
preparing a battery case including a case-penetrating hole;
preparing an external terminal including a member-engaging hole;
preparing an internal terminal including a shaft portion;
assembling the battery case, the external terminal, and the internal terminal together so that the external terminal is stacked on an outside of the battery case, the internal terminal is stacked on an inside of the battery case, and the shaft portion is inserted through the case-penetrating hole and the member-engaging hole;
forming a fastening portion by crushing a tip end of the shaft portion and fastening the tip end of the shaft portion to a circumferential periphery of the member-engaging hole on an outside of the external terminal; and
laser welding the fastening portion and the external terminal seamlessly along a plurality of weld lines that are set at two or more locations of the fastening portion that are circumferentially spaced from each other and that are set so as to extend across a periphery of the fastening portion in a radial direction along an outer surface of the fastening portion by continuously shifting a position to which a laser is applied along each of the weld lines, wherein,
in the step of laser welding of each weld line, welded portion has a length of K1 along the weld line in the radial direction and a width of K2 along a direction perpendicular to the weld line, and the length K1 is at least 1.5 times longer than the width of K2,
in the step of laser welding of each weld line, a region that is to be laser welded is set to be at least 2.5 times longer in a region external to the fastening portion than in a region internal to the fastening portion, and
in the step of laser welding of each weld line, the welded portion does not extend into an inside of the member-engaging hole when viewed axially along the shaft portion.