Cylindrical secondary battery having an electrode with a multi-tab configuration

A cylindrical secondary battery comprising:

• an electrode assembly comprising a positive electrode plate having a positive electrode multi-tab, a separator, and a negative electrode plate having a negative electrode multi-tab, the positive electrode plate, the separator, and the negative electrode plate being laminated and wound to have a winding center at a center thereof;
• a cylindrical can accommodating the electrode assembly;
• a cap plate coupled at an upper end of the cylindrical can and being electrically connected to the negative electrode multi-tab;
• and
• a positive electrode terminal protruding upwardly through the cap plate and being electrically connected to the positive electrode multi-tab,
• wherein the positive electrode multi-tab comprises a plurality of positive tabs protruding from an upper surface of the electrode assembly, each of the respective positive tabs being bent in a direction from an outermost side of the electrode assembly towards the winding center, a length of the respective positive tabs gradually increasing in a direction from the winding center toward the outermost side of the electrode assembly, and
• wherein the negative electrode multi-tab comprises a plurality of negative tabs protruding from the upper surface of the electrode assembly, each of the respective negative tabs being bent in the direction from the winding center towards the outermost side of the electrode assembly, a length of the respective negative tabs gradually increasing in the direction from the outermost side of the electrode assembly toward the winding center.