Sealing structure for a terminal pole in a closed secondary battery

摘要

A closed secondary battery (1) having a sealing structure for preventing electrolyte leak for a long period is presented. An annular packing (3) is chemically bonded in a ring form to the surface of a disk-shaped flange (5) formed inside of a battery of a terminal pole (2) projecting from inside to outside of the battery, by penetrating through a cover member (4) of closed secondary battery. Fitting an annular spring (6) while pulling the terminal to outside of the battery, the terminal pole (2) is fixed in the cover member (4). At this time, the annular packing (3) is compressed against the cover member (4), and the passage of electrolyte leak (9) is shut by this compression.