| CPC B23K 26/21 (2015.10) | 7 Claims |
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1. A laser welding method for a secondary battery, the method comprising:
irradiating a first laser beam to laser-weld a first electrode substrate tab onto a first electrode uncoated region of a first electrode plate, such that the first laser beam is irradiated onto a first welding portion, the first welding portion being on an overlap region between the first electrode substrate tab and the first electrode uncoated region; and
irradiating a second laser beam to laser-weld a second electrode substrate tab onto a second electrode uncoated region of a second electrode plate, such that the second laser beam is irradiated onto a second welding portion, the second welding portion being on an overlap region between the second electrode substrate tab and the second electrode uncoated region,
wherein the first electrode substrate tab and the second electrode substrate tab are fusion-bonded to the first electrode uncoated region and the second electrode uncoated region, respectively, as a result of laser welding in a preset welding pattern at each of the first and second welding portions, and
wherein irradiating the first and second laser beams includes applying intermittent pulses of a laser beam to target portions that overlap each other on the first and second welding portions, respectively, such that the preset welding pattern at each of the first and second welding portions is formed by overlapping spot-welded portions.
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