| CPC H01M 50/169 (2021.01) [H01M 50/147 (2021.01); H01M 50/15 (2021.01); B23K 26/0608 (2013.01); B23K 26/206 (2013.01); B23K 26/24 (2013.01); B23K 2101/36 (2018.08); H01M 50/103 (2021.01); H01M 50/502 (2021.01); H01M 50/609 (2021.01); Y02E 60/10 (2013.01)] | 20 Claims |
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1. A rechargeable battery comprising:
a case in which an electrode assembly is accommodated in an inner space and one side is opened;
a cap plate closing and sealing one surface of the case; and
a welding bead part formed along a circumference of the cap plate and formed at a contact surface of the case and the cap plate,
wherein the welding bead part includes a first region and a second region on a cross-section vertical to a welding progressing direction of the welding bead part,
the first region has a first boundary line on the cross-section, the contact surface of the case and the cap plate is disposed between both end parts of the first boundary line,
the second region has a second boundary line on the cross-section, the first region is disposed between both end parts of the second boundary line to form a first contact point and a second contact point in contact with the first boundary line such that the first contact point and the second contact point are on opposite sides of the contact surface of the case and the cap plate, and
the first region has a deeper depth than the second region, and the second region has a wider width than the first region.
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