| 摘要 |
Provided is a protection element which has improved rated values corresponding to higher voltage and larger current of a lithium ion secondary battery or the like. This protection element is provided with: an insulating substrate (11); a heat-generating resistor (14); first and second electrodes (12A1, 12A2); a heat-generating lead-out electrode (16) which is connected to the heat-generating resistor (14); and a fusible conductor (13) which is laminated on the region from the heat-generating lead-out electrode (16) to the first and second electrodes (12A1, 12A2), and which fuses a current path between the first and second electrodes (12A1, 12A2) by heating. The insulating substrate (11) is provided with first and second external connection electrodes (21, 23) and one or more of first and second external connection terminals (22, 24) on the same surface on which the fusible conductor (13) is provided. The combined resistance of the first external connection terminal (22) and the second external connection terminal (24) is lower than the conduction resistance between the first and second external connection electrodes (21, 23). |
