Abstract: Provided is a sealed battery including a battery case which is obtained by welding an outer can and a lid plate to each other, in which the sealed battery has a configuration capable of obtaining both advantageous effects in which: the thickness of the battery case can be decreased to decrease the size of the battery; and a decrease in the weld strength between the outer can and the lid plate can be prevented. The sealed battery includes a battery case in which an electrode body and an electrolytic solution are sealed. The battery case includes: a box-shaped outer can having an opening; and a lid plate that is welded to an edge portion of the opening in a state of covering the opening. In the lid plate, a thickness of an outer peripheral portion welded to the edge portion of the opening is greater than a thickness of a portion covering the electrode body.

Abstract: To obtain a configuration in which an insulator arranged between a lid plate and a terminal is not damaged by heat generated during welding in a sealed battery including a battery case obtained by welding an outer peripheral edge portion of a lid plate to an opening portion of an outer can. A sealed battery 1 includes a battery case 2, a negative electrode terminal 22, and an insulating packing 21 arranged between the battery case 2 and the negative electrode terminal 22. The battery case 2 has an outer can 10 having at least one opening portion 16, and a lid plate 20 welded to the opening portion 16 of the outer can 10 at an outer peripheral edge portion 20c while the opening portion 16 is covered. The negative electrode terminal 22 is electrically connected to an electrode assembly 30 through the lid plate 20.