Rechargeable battery

摘要

A rechargeable battery configured to stably and easily interrupt a current includes: an electrode assembly including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; a case containing the electrode assembly therein and having a first opening at one end thereof; and a first plate coupled to the case and sealing the first opening, the first plate electrically connected to the electrode assembly, wherein the first plate includes a wrinkle portion configured to deform for disconnecting the first plate from the electrode assembly when an internal pressure of the case is greater than a reference pressure.

主权项

1. A rechargeable battery comprising:
an electrode assembly comprising a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, a first electrode of the positive and negative electrodes including a coating portion coated with an active material; a case containing the electrode assembly therein and having a first opening at one end thereof; a first plate coupled to the case and sealing the first opening, the first plate having a through hole at a central part of the first plate; and a terminal protruding to an interior of the case through the through hole of the plate and electrically connected to the first electrode through a welded portion, wherein the first plate comprises a wrinkle portion surrounding the through hole and deforming and disconnecting the terminal from the first electrode at a region spaced apart from the terminal between the welded portion and the coating portion when an internal pressure of the case is greater than a reference pressure, and the wrinkle portion is deformed and the terminal is moved in the direction outside of the case so that an uncoated region having a notch and no active material coating is broken and disconnected from the terminal when the internal pressure of the case is greater than the reference pressure, wherein the wrinkle portion comprises at least one protrusion and at least one depression, the at least one protrusion and the at least one depression adjacent one another.