Abstract: A sealed prismatic battery is provided. The battery includes a battery casing 4 having a prismatic cylindrical shape of body with a bottom part and an upper opening, and a lid 5 which fits in the upper opening of the battery casing. The opening of the casing body 4 and the lid 5 have laterally long shape in which the back-and-forth width dimension is smaller than the lateral length. The outer periphery of the lid 5 being welded to the periphery of the upper opening of the battery casing 4 to form a welded portion. The welded portion includes a pair of fragile parts 11 having low weld strength and formed at the ends of two long sides 10a and 10b of 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.

Abstract: A battery provided with one end of each lead element connected to the positive and negative electrode respectively is drawn out from the can body 3 through a space 6 formed at a surface part of said jointed flange section 32a, 32b and the area of the flange section around the drawing space is sealed by a resin bonding. The battery provided with a new structure which can solve the problems which may be generated in all fields, such as battery shape, attachment property, battery strength, productivity and so on in order to make a thin type battery.

Abstract: A sealed prismatic battery is provided. The battery includes a battery casing 4 having a prismatic cylindrical shape of body with a bottom part and an upper opening, and a lid 5 which fits in the upper opening of the battery casing. The opening of the casing body 4 and the lid 5 have laterally long shape in which the back-and-forth width dimension is smaller than the lateral length. The outer periphery of the lid 5 being welded to the periphery of the upper opening of the battery casing 4 to form a welded portion. The welded portion includes a pair of fragile parts 11 having low weld strength and formed at the ends of two long sides 10a and 10b of 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.

Abstract: A sealed battery capable of increasing the battery capacity while ensuring high sealing properties can be obtained. The sealed battery comprises, a battery case 1, a lid 7 for closing the opening top face of the battery case 1, a terminal mounting hole 13 in the lid 7, and a negative terminal 11 engaging with the terminal mounting hole 13 via an insulating packing 9. The negative terminal 11 comprises, a head portion 19, a tapered portion 21 continuing to the lower face of the head portion 19 and an axial portion 22 protruded downward from the tapered portion 21. The insulating packing 9 comprises, a cylindrical portion 25 having a through hole 24 through which the axial portion 22 of the output terminal 11 penetrates, and a flange 26 lying between the head portion 19 of the output terminal 11 and the lid 7.

Abstract: A battery provided with one end of each lead element connected to the positive and negative electrode respectively is drawn out from the can body 3 through a space 6 formed at a surface part of said jointed flange section 32a, 32b and the area of the flange section around the drawing space is sealed by a resin bonding.