Sealed storage batttery with safety valve and reproduction method

A sealed storage battery includes a battery case containing a group of electric power-generating elements each comprising a positive electrode, a negative electrode and a separator, a battery case lid (14) closing an opening in the battery case to seal the battery case, and a safety valve (3) of the assembling type mounted on the battery case lid. The safety valve is welded (8) to the battery case lid. With this construction, a hermetic seal at an area of contact between the safety valve and the battery case lid is enhanced, and also the reliability of the safety valve is enhanced.