Lead plate, battery pack having the same, and method of manufacturing the battery pack

The invention relates to a lead plate (301) that electrically connects a plurality of battery cells, and that includes a first welding unit; a second welding unit separately disposed from the first welding unit by a slit between the first and second welding units; and a by-pass unit, an end of which is connected to the first welding unit and the other end of which is connected to the second welding unit, wherein the end of the by-pass unit is disposed on an opposite side of the slit based on the first welding unit, and the other end of the by-pass unit is disposed on an opposite side of the slit based on the second welding unit. The invention also relates to a battery pack including this lead plate (301) and a method of manufacturing this battery pack.