Secondary battery

摘要

A secondary battery includes an electrode assembly, a case and a tab film. The electrode assembly has first and second electrode tabs formed to protrude therefrom. The case accommodates the electrode assembly so that a portion of at least one of the first and second electrode tabs is exposed to an outside thereof, and has a sealing portion formed along an edge portion thereof. The tab film is formed to surround at least one of the first and second electrode tabs that come in contact with the sealing portion of the case. In the tab film, at least one region of the tab film is formed of a material having a melting point different from that of the other region. Accordingly, the explosion and fire of the secondary battery is prevented, thereby improving the safety of the secondary battery.

主权项

1. A secondary battery comprising:
an electrode assembly having first and second electrode tabs formed to protrude therefrom; a case that accommodates the electrode assembly so that a portion of at least one of the first and second electrode tabs is exposed to an outside thereof, and has a sealing portion formed along an edge portion thereof; and a tab film formed to surround at least one of the first and second electrode tabs that come in contact with the sealing portion of the case, wherein at least one region of the tab film is formed of a material having a melting point different from that of the other region and wherein the electrode tab has a first width at the location of the sealing portion and the tab film has a second width greater than the first width at the location of the sealing portion temperature region of the tab film is interposed between a lower melting temperature region of the tab film and the outer width of at least one side of the electrode tab so as to physically separate the lower melting temperature region from the electrode tab.