Button cell

Abstract

To obtain a coin-shaped cell, in which liquid leakage from a sealed part can be prevented surely, while reduction of cell capacity is suppressed. A cell can for housing a power generation element includes a cathode can of which an outer peripheral cylindrical wall is bent upward from the outer peripheral brim of a bottom face wall, and an anode can of which an outer peripheral side wall is bent downward from the outer peripheral brim of an upper face wall. An upper end peripheral brim part of the peripheral cylindrical wall of the cathode can is calking worked inward via a gasket mounted on the outer peripheral side wall of the anode can. The outer peripheral side wall of the anode can includes an enlarged diameter part thrusting in a step form an an angle downward from the outer peripheral brim of the upper face wall, and a straight part linearly extending downward continually to the enlarged diameter part, so that the center of the curvature of a curving part of the outer peripheralcylindrical wall that is bent inward by the calking work of the outer peripheral cylindrical wall of the anode can is made to be positioned at further outside than the outer peripheral side wall of the anode can.

Description

technical field [0001] The present invention relates to a button cell, which comprises a positive electrode case that bends the outer peripheral cylinder wall upward from the outer peripheral edge of the circular bottom wall and a negative electrode case that bends the outer peripheral side wall downward from the outer peripheral edge of the circular upper wall, and the positive electrode case The upper end peripheral portion of the outer peripheral cylindrical wall of the positive electrode case is caulked by a gasket mounted on the outer peripheral side wall of the negative electrode case, so that an inwardly bent portion is formed at the upper end of the outer peripheral cylindrical wall of the positive electrode case. Background technique [0002] Such a button battery is disclosed in Patent Documents 1 to 6. Wherein, the shallow disk-shaped negative electrode casing and the shallow disk-shaped positive electrode casing with an outer diameter larger than the negative ele...

AI Technical Summary

Problems solved by technology

[0010] But the problem is that the outer peripheral side wall of the negative electrode case is pressed to the inner side of the battery by the chiseling force and the outer peripheral side wall is deformed toward the inner side of the battery, which reduces the sealing performance, so that there is a possibility of liquid leakage from the sealing part

And, because the internal volume of the battery is reduced, the deformation part of the outer peripheral side wall of the negative electrode casing is reduced, thereby reducing the battery capacity

Images