Battery and production method thereof

Abstract

According to one embodiment, there is provided a battery having a plurality of current collector tabs extended from a plurality of points of a current collector of at least one electrode of a positive electrode and a negative electrode. The battery further has a lid and a lead. The lead has a current collector tab junctional part connected with the current collector tabs, a lid junctional part fixed to the lid, and a vibration absorber part linking the current collector tab junctional part to the lid junctional part.

What is claimed is: 
     
         1 . A production method of an angular battery comprising an angular tube-shaped metal container having a bottom; a positive electrode and a negative electrode accommodated in the container; a lid placed on an opening part of the container; and a terminal fixed to the lid by caulking and connected to the positive electrode or the negative electrode electrically, wherein the lid comprises a bottom placed in the opening part of the container, and a stair part located above the bottom and protruding outward beyond the bottom,
 the method comprising:   placing the bottom of the lid in the opening part of the container accommodating the positive electrode and the negative electrode, and placing the stair part of the lid on an upper end of a side wall of the container; and   irradiating a laser from a direction vertical to a surface at which the stair part of the lid is overlaid on the upper end of a side wall of the container to weld the stair part of the lid to the upper end of a side wall of the container by laser welding.   
     
     
         2 . The method according to  claim 1 , wherein the stair part of the lid has a thickness being the same as or less than a wall thickness of the container. 
     
     
         3 . The method according to  claim 1 , wherein the lid comprises a through hole in which the terminal is fixed by caulking, and a depression at a part corresponding to the through hole on sides in a long side direction of the lid. 
     
     
         4 . An angular battery produced by the method according to  claim 1 .