Button cell and method for welding electrode tabs to a pole shell of the button cell

A button cell, comprising:

• a pole shell formed by buckling an anode shell and a cathode shell to each other;
• an electric core provided in the pole shell, and
• an insulating seal ring provided between overlapped portions of the anode shell and the cathode shell, wherein
• the electric core is composed of an anode piece, a diaphragm and a cathode piece which are laminated and then coiled;
• the anode piece and the cathode piece are electrically connected to the anode shell and the cathode shell through an anode tab and a cathode tab;
• the button cell further comprises at least one metal shell;
• the cathode tab and/or the anode tab of the electric core is/are welded to a metal sheet;
• and
• the metal sheet is then welded to the cathode shell and/or the anode shell.