CYLINDRICAL BATTERY AND ELECTRODE STRUCTURE FOR BATTERY

The invention relates to a cylindrical battery including an electrode that can be easily expanded and contracted in outer diameter upon insertion into a case. The cylindrical battery includes a cylindrical battery case (2), and a cylindrical electrode assembly (3) arranged in the battery case (2) and including a positive electrode (31), a negative electrode (32), and a separator (33). The electrode assembly (3) has a slit (3S) extending from a first axial end to a second axial end.