| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cylindrical lithium secondary battery which has an improved battery safety against an external pressure by forming at least one bending part in a longitudinal direction of a winding shaft and dispersing distortion when an external pressure is applied. <P>SOLUTION: A cylindrical lithium secondary battery is composed of a first electrode plate 310, a second electrode plate 320, a winding-up electrode assembly 300 provided with a separator 330 placed between the first electrode 310 and the second electrode 320, at least one bending part 620 having a shape of a cylinder and formed in a longitudinal direction on which a notched groove 610 is formed alongside a longitudinal direction, a winding shaft 600 to be inserted in a central space in the electrode assembly 300, a case 400 provided with a space accommodating the electrode assembly 300, and a cap assembly 500 which connects and seals an upper part of the case 400. <P>COPYRIGHT: (C)2007,JPO&INPIT |
