Hitachi Maxell, Limited

Shota Aoki

Yoshiki Somatomo

Naoto Sugimune

Toshiya Takaishi

A sealed prismatic battery is provided. The battery includes a battery casinghaving a prismatic cylindrical shape of body with a bottom part and an upper opening, and a lidwhich fits in the upper opening of the battery casing. The opening of the casing bodyand the lidhave laterally long shape in which the back-and-forth width dimension is smaller than the lateral length. The outer periphery of the lidbeing welded to the periphery of the upper opening of the battery casingto form a welded portion. The welded portion includes a pair of fragile partshaving low weld strength and formed at the ends of two long sidesandof the welded portion which are parallel to each other, respectively, The battery is appropriately prevented from exploding and strength of battery is sufficiently provided against an impact caused by fall or the like.

Growing community of inventors

Ibaraki, Japan

Shota Aoki