Secondary battery and battery pack including secondary battery

摘要

A secondary battery and a battery pack including the second battery, which includes a battery case having a polarity (e.g., positive or negative polarity) in a normal operation, thereby reducing corrosion of the battery case and facilitating a design of an external circuit. The battery case is neutralized in an abnormal operation (e.g., penetration of a nail, over discharge, and over charge), thereby improving safety and reliability of the secondary battery and the battery pack. The secondary battery includes an electrode assembly, a battery case accommodating the electrode assembly, electrode terminals electrically connected to the electrode assembly and extending out of the battery case, and a fuse part disposed between the battery case and the electrode terminal to electrically connect the battery case to the electrode terminal. The fuse part is configured to selectively electrically disconnect the battery case from the electrode terminal.

主权项

1. A secondary battery comprising:
an electrode assembly; an electrically conductive battery case accommodating the electrode assembly; an electrode terminal electrically connected to the electrode assembly and extending out of the battery case; a fuse part electrically connecting the battery case to the electrode assembly through the electrode terminal when not in a blown state and electrically disconnecting the battery case from the electrode assembly when transitioning to the blown state; and a connecting bar electrically connecting the fuse part to the electrode terminal, wherein the fuse part comprises:
a fuse holder coupling to the connecting bar; anda fuse device coupling to the fuse holder and electrically connecting the battery case to the connecting bar when not in the blown state and electrically disconnecting the battery case from the connecting bar when transitioning to the blown state, and wherein the fuse device is formed of one of a copper alloy or an alloy of zinc and tin.