Secondary Battery

A secondary battery, comprising:

• a casing;
• an electrode assembly stack including a plurality of electrode assemblies accommodated in the casing, each electrode assembly including a plurality of electrodes having electrode tabs;
• a plurality of electrode tab bundles formed from the electrode tabs of the plurality of electrode assemblies, respectively;
• a current collector coupled to the plurality of electrode tab bundles;
• and
• a cap assembly sealing the casing and having an external terminal connected to the current collector,
• wherein the current collector includes:
• a main support plate on which a connection terminal connected to the external terminal is positioned, and
• a plurality of branches extending from a side of the main support plate along a width direction of the electrode assemblies, the electrode tab bundles being coupled thereto,
• wherein the plurality of branches includes a first branch and a second branch that are spaced apart from each other in a thickness direction of the electrode assembly stack, the thickness direction of the electrode assembly stack intersecting the width direction of the electrode assemblies, and
• wherein the current collector is asymmetrical about a virtual center line extending in the width direction of the electrode assemblies.