| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical battery that can promptly discharge gas generated in the electrode body from the electrode body. SOLUTION: The cylindrical battery comprises an electrode body 12, which has a separator 18 held between a positive electrode plate 14 and a negative electrode plate 16 housed wound in a whirlpool state together with an electrolyte in the cylindrical bottomed battery packaging can 30. In an opening 13 formed in the center of the winding core of the electrode body 12 wound in a whirlpool shape, a metal foil 40 of which both ends are rounded in a state of overlapping in cylindrical shape is inserted. And part of the outer circumference of the metal foil 40 contacts the innermost circumference of the electrode body 12. And the diameter of the rounded metal foil 40 is made variable to change according to the change of the size of the opening 13 due to swell and contraction of the electrode body 12.
|
