Patent ID: 8617734
Filing Date: 2013-12-31
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A battery cell with a weakness for relieving pressure, comprising: a jelly roll comprising layers which are wound together, including a cathode with a first active coating, a separator, and an anode with a second active coating; a pouch, which encloses the jelly roll, wherein the pouch is flexible; a first conductive tab coupled to the cathode; and a second conductive tab coupled to the anode; wherein the first and second conductive tabs extend through seals in the pouch to provide terminals for the battery cell; and wherein the pouch includes the weakness which yields when internal pressure in the pouch exceeds a threshold to create a hole which releases the internal pressure, the weakness including a wave pattern of tiny holes that extends from a first end to a second end of a predetermined portion of a seal for the pouch, the predetermined portion located on at least one side of the pouch through which the conductive tabs do not extend.