| 摘要 |
The present invention aims to provide a rectangular secondary battery 1 including a current breaking mechanism with improved rigidity against a vibration and an impact. The rectangular secondary battery 1 according to the present invention includes the current breaking mechanism interposed in the middle of a current path electrically connecting between an external terminal 61 and a wound electrode group 40 to break the current path by the rise of battery internal pressure. The current breaking mechanism includes a connection electrode 67 arranged inside a battery lid 3 and electrically connected to the external terminal 61, and a conductive plate 68 bonded to the connection electrode 67 and deformed by the rise of the battery internal pressure. The connection electrode 67 includes a tabular member having a through hole 61d in communication with the outside of the battery opening on a planar portion 67b, and the conductive plate 68 includes a dome-shaped diaphragm portion gradually reducing its diameter as shifting in an axial direction and a flange portion 68a extending radially outward from an outer peripheral portion of the diaphragm portion, the diaphragm portion covering an opening 67a of the connection electrode 67, and the flange portion 68a bonded to the planar portion 67b of the connection electrode 67. |
