Electrode lead made of dissimilar metals and method of manufacturing the same

An electrode lead of a battery cell, the electrode lead comprising:

• a first metal plate made of a first metal;
• and
• a second metal plate made of the first metal and second metals,
• wherein the second metals have a lower melting temperature than the first metal, and the second metals are mixed within the second metal plate such that the second metals are unevenly dispersed within regions of the first metal, such that the second metal plate has first areas that consist of only the first metal and second areas that consist of only the second metals, a majority of the second areas being circular in plan view, the first metal and the second metals of the second metal plate each having top and bottom surfaces extending along top and bottom same planes, respectively, and each entirely contained in or between the top and bottom same planes,
• wherein none of the second areas extends completely across the second metal plate in a lateral direction perpendicular to an extension direction of the electrode lead, and
• wherein the second areas together have a surface area that is 20% to 90% of a surface area of the second metal plate.