Collector Plate Laser Welding for Stronger Battery Tab Bonding

The patent applies dynamics by making the laser beam movable through wobbling motion. The laser beam is irradiated in a wobbling manner onto the collector plate, which allows the heat to be distributed over a larger area and prevents concentration of heat at a single point. This dynamic irradiation method enables sufficient welding strength while preventing spatter and separator melting that would occur with static high-output laser application.

The patent introduces temporal dimension to the laser irradiation process by alternating the laser beam position through wobbling motion. Instead of continuous stationary irradiation, the laser beam moves back and forth in the radial direction of the spiral, creating a time-varying heat distribution pattern. This dimensional change allows heat to diffuse properly without causing localized overheating, thus preventing spatter and separator melting while maintaining welding strength.

The wobbling laser irradiation creates a dynamic heating process where the laser beam continuously moves across the collector plate surface. This dynamic motion allows the use of lower laser output compared to static irradiation, because the cumulative heat input over time and area is sufficient for welding, while the instantaneous heat density remains low enough to prevent spatter and separator melting.

The patent employs periodic action through the wobbling motion of the laser beam, which oscillates in a regular pattern during irradiation. This periodic movement creates cycles of heating and cooling across different areas of the collector plate, allowing heat to dissipate before concentrating too much in one location. The periodic action enables effective welding at reduced laser output levels while preventing thermal damage.