| 摘要 |
PROBLEM TO BE SOLVED: To provide a current cutoff device in which a fusion zone is prevented from being blown out even if an edge of a reverse plate of the current cutoff deice and a step part of a rivet are welded, and a blow hole is prevented from being residual even if the fusion zone is blown out, a manufacturing method of the current cutoff device, and a secondary battery.SOLUTION: In the current cutoff device, in a cross-sectional view in a forward movement direction DR1 of a laser beam LB1, a fusion boundary side face 50a of a first fusion mark 50 closer to the laser beam LB1 is tilted away from a surface 33a of an edge 33 as the side face moves in a direction opposite to the forward movement direction DR1 of the laser beam LB1.SELECTED DRAWING: Figure 7 |
