SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery capable of improving insulation property between a diaphragm connected to an external terminal outside a battery case and a collector plate connected to an electrode inside the battery case when a current is interrupted by a current interruption mechanism.SOLUTION: A current interruption mechanism 60 includes: a diaphragm 5, connected to an external terminal 20A, having a welded part WP between a collector plate 30A and an insulation member 70 disposed in a surrounding of the welded part WP between the diaphragm 5 and the collector plate 30A. The insulation member 70 includes a plurality of insertion pieces 71 adjacently disposed on a side of the welded part WP by being inserted between the diaphragm 5 and the collector plate 30A.