SECONDARY BATTERY HAVING IMPROVED MANUFACTURING PROCESS EFFICIENCY AND SAFETY

摘要

Provided is a secondary battery that has a positive electrode/separator/negative electrode jelly-roll structure within a cylindrical battery case. An insulating member having a planar structure is installed on the upper end of the jelly-roll structure, and includes an opening and a plurality of pores. Gas is discharged through the opening, and an electrode terminal passes through the opening. The pores are disposed on the front surface of the insulating member, and have a diameter of 100 µm or less. Electrolyte passes through the pores.