Patent ID: 11967734
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 14:
15. A method for manufacturing a secondary battery, the method comprising:
alternately stacking electrodes and separators to manufacture a radical unit, wherein one electrode is stacked at an uppermost end of the radical unit;
cutting a separation film to manufacture a separation part having a size corresponding to each of the separators and a pair of side surface protection parts, each of the pair of side surface protection parts connected to a side surface of the separator to manufacture a separation sheet;
locating the separation sheet at an uppermost end of the radical unit and folding the side surface protection parts with respect to the separation part and then locating the side surface protection parts on each side surface of the radical unit to manufacture an unfinished electrode assembly;
pressing the uppermost end and a lowermost end of the unfinished electrode assembly at the same time to allow the separation sheet and the radical unit to adhere to each other;
attaching a fixing tape to surround the unfinished electrode assembly and thereby to manufacture a finished electrode assembly;
accommodating the finished electrode assembly in a battery case and sealing an edge surface of the battery case to manufacture a finished secondary battery:
adhering the pair of side surface protection parts to side surfaces of each of the separators provided in the radical unit; and
forming a punching hole through which foreign substances do not pass, but an electrolyte passes, in at least one of the pair of side surface protection parts of the separation sheet,
wherein adhesion between the pair of side surface protection parts and the side surfaces of the separators is less than adhesion between each of the electrodes and the separators in the radical unit.