Sealed battery

Abstract

The center pin 20 is cylindrical and tube-shaped, and each of the planes formed by the external surface of the center pin 20 in the vicinity of the edges 22a and 22b of the slit 21 is angled toward the inside of the center pin 20. The edges 22a and 22b are therefore arranged to be more inward than the imaginary circumference that complements the gap from the slit 21 of the center pin 20, and consequently, the edges 22a and 22b have less possibility of contacting and damaging the spiral-wound electrode assembly 10 in the event an external force deforms the center pin 20. Further, the planes formed by the external surface of the center pin 20 in the vicinal areas 23a and 23b of the edges 22a and 22b are angled so as to form an angle of no greater than 120 degrees.

Dependencies are inferred from the claim text.