Abstract: A battery cell of the present disclosure includes: an electrode assembly including a cathode, an anode, and a separator; and an exterior material accommodating the electrode assembly therein, wherein the exterior material includes: a first portion forming an accommodation space in which the electrode assembly is accommodated; a second portion formed integrally with the first portion; and a notch portion formed by recessing at least a part of the second portion and having a re-solidification layer on an outside of the second portion, and wherein the second portion includes a plurality of crystal grains, and the plurality of crystal grains of the second portion include an equiaxed microstructure.

Abstract: A battery cell of the present disclosure includes: an electrode assembly including a cathode, an anode, and a separator disposed between the cathode and the anode; and an exterior material accommodating the electrode assembly therein, wherein the exterior material includes: a first region including a notch portion provided on an outer surface; and a second region surrounding the first region, wherein the tensile strength of the first region is provided to be lower than the tensile strength of the second region.