JELLY-ROLL OF IMPROVED PRODUCTIVITY AND BATTERY CELL COMPRISING THE SAME

摘要

Disclosed herein is a jelly roll for a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.

主权项

1. A method of manufacturing a jelly roll, the method comprising:
(a) winding a cathode sheet and an anode sheet in a state in which a separator is disposed between the cathode sheet and the anode sheet; (b) positioning electrode tabs each having an embossed structure formed at a surface thereof on uncoated portions of the cathode sheet and the anode sheet so that protruding parts of the embossed structure face a corresponding one of the uncoated portions; and (c) positioning horn tips of a welding device in depressed parts of the embossed structure of each of the electrode tabs and applying ultrasonic waves to the depressed parts.