| 摘要 |
An electrochemical cell is disclosed that includes a cell housing and a spiral-wound electrode assembly including wound alternating layers of a positive electrode, a separator, and a negative electrode. The electrochemical cell further includes a destruction control mechanism provided proximate an interior surface of the cell housing for piercing a portion of the separator layer to create an internal short circuit between outermost layers of the positive and negative electrodes of the spiral-wound electrode assembly when an excessive force is applied to the destruction control mechanism. The destruction control mechanism includes burrs formed on either or both of the electrodes that protrude towards the electrode of opposite polarity so as to penetrate through the adjacent separator layer to create an internal short circuit when excessive force is applied to the burrs. Preferably, the burrs are created by stitching a conductive tab to an exposed portion of the conductive foil strip forming a portion of the negative electrode. To further increase the likelihood that the first internal short circuit will occur when the burrs penetrate the separator, the portion of the positive electrode underlying the burrs may be formed of exposed conductive foil to provide an inert region for the short circuit to occur. |
