METHOD OF LASER WELDING TABS AND CURRENT COLLECTOR OF A SECONDARY BATTERY

Provided is a technique to reduce voids between an electrode tab (21t, 22t) and a current collecting unit (33, 43) in a portion where the electrode tab (21t, 22t) and the current collecting unit (33, 43) are welded. The manufacturing method disclosed herein is a method of manufacturing a secondary battery (100) including an electrode body (20) having an electrode tab (21t, 22t) and a current collecting unit (33, 43) electrically connected to the electrode body (20). This method includes: welding between the electrode tab (21t, 22t) and the current collecting unit (33, 43), by sandwiching the electrode tab (21t, 22t) between a laser transparent material (G) and the current collecting unit (33, 43) and then applying laser (LA) to penetrate the transparent material (G) and welding the tabs and the current collector unit. This method avoir projection of spatters.