| 摘要 |
The present invention relates to a secondary battery in which a stacked electrode assembly (20) having a cathode, an anode and a separator (22) is accommodated together with an electrolytic solution between exterior members (30). There is known a technique for joining the outer peripheral portion of the separator together with the sealed portions of the exterior members in the secondary battery in order to prevent shifting in the stacked electrode assembly. In this technique, however, no measures have been taken to refill the stacked electrode assembly with the electrolytic solution and to prevent breakage in the joint part on the outer peripheral portion of the separator for the purpose of maintaining battery performance. The present invention solves such problems by providing a secondary battery with a plurality of joint parts at which the outer peripheral portion of the separator is joined with the exterior members and a holding part formed at least between the joint parts so as to hold therein the electrolytic solution, wherein a sum of perimeters of the joint parts is longer than a perimeter of a rectangle of minimum area enclosing therein all of the joint parts. |
