SEALED TYPE NON-AQUEOUS SECONDARY BATTERY AND BATTERY PACK

摘要

PROBLEM TO BE SOLVED: To provide a sealed type non-aqueous secondary battery having very high safety even in the time of abnormalities. SOLUTION: An electrode group 2 which is composed of a positive electrode and a negative electrode which are isolated by a separator and wound up, is contained in a battery packaging can 1. The battery packaging can 1 is integrated with a cylindrical body 4 which has a cylinder shape bottom portion 5 of which the bottom is opened. The cylindrical body 4 is located generally in a center portion, and formes a center of a winding of the electrode group 2. Heat generated inside the cell can be released in the direction of bottom opening of the battery packaging can 1 by the cylindrical body 4.