| 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.
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