Battery cell with improved safety and method of manufacturing the same

The present invention relates to a battery cell with improved safety and a method of manufacturing the same, and more particularly a battery cell configured such that an electrode assembly including a positive electrode () and a negative electrode () located so as to be opposite each other in the state in which a separator () is interposed therebetween is received in a cell case (), wherein the positive electrode () includes a positive electrode plate () and a positive electrode active material layer () provided on one surface and/or the other surface of the positive electrode plate (), the negative electrode () includes a negative electrode plate () and a negative electrode active material layer () provided on one surface and/or the other surface of the negative electrode plate (), the positive electrode active material layer () includes a first flat portion () and a first inclined portion () provided at each of opposite sides of the first flat portion (), and the negative electrode active material layer () includes a second flat portion () and a second inclined portion () provided at each of opposite sides of the second flat portion () and a method of manufacturing the same.