Electrode lead and secondary battery having the same

摘要

An electrode lead is applied as a part of at least one of a cathode lead and an anode lead of a secondary battery and includes a first metal plate and a second metal plate spaced apart from each other with a gap therebetween and having coating layers formed on the surfaces thereof except for surfaces of end portions thereof facing each others, and a metal bridge made of material having a lower melting point than the first metal plate and the second metal plate and buried in the gap so that the end portions are not exposed. In this case, if an overcurrent flows through the electrode lead, a portion of the metal plate at which a metal bridge is formed is rapidly broken to irreversibly interrupt the overcurrent flowing at the secondary battery without giving a substantial influence on the temperature of the secondary battery.

主权项

1. An electrode lead, which is applied as a part of at least one of a cathode lead and an anode lead of a secondary battery, the electrode lead comprising:
a first metal plate and a second metal plate spaced apart from each other with a gap therebetween and having coating layers formed on surfaces thereof except for surfaces of end portions thereof facing each other; and a metal bridge made of material having a lower melting point than the first metal plate and the second metal plate and buried in the gap so that the end portions are not exposed, wherein the surface of the end portion includes a first surface positioned inside the gap and a second surface extending from the first surface and positioned out of the gap, wherein the coating layer is made of nickel, wherein the metal bridge is a lead-free alloy containing tin and copper as main components, and wherein the metal bridge and the coating layer are formed not to overlap each other.