| 摘要 |
PROBLEM TO BE SOLVED: To absorb the vertical wave energy generated in ultrasonic welding and suppress the vibration of an internal electrode terminal by the vertical wave to prevent the rupture of the internal electrode terminal by providing, in the internal electrode terminal, a vertical wave absorbing part for absorbing the vertical wave generated in the ultrasonic welding of an electrode lead. SOLUTION: The internal electrode terminal 9 of an electrolyte built-in type lithium secondary battery has a three-dimensional structure consisting of a plate 91 having a through-hole 93 and a cylinder body 92 integrally fixed to the periphery of the plate body 91. The vicinity of the integrally fixed part 94 of the plate 91 and the cylinder 92 functions as a vertical wave absorbing part. The tip of a positive electrode lead 32 is ultrasonically welded onto the inner side wall of the cylinder 92. Since the ultrasonic vertical wave in the ultrasonic welding of the positive electrode lead 32 onto the inner side wall of the cylinder 92 is effectively absorbed in the fixed position 94, the plate 91 can be protected from the breakage by ultrasonic vertical wave. |
