Patent ID: 7935436
Filing Date: 2011-05-03
Classification: H01M,Y02E,Y02P

Abstract:
1. A rechargeable battery comprising: an electrode assembly having a plurality of protruding electrodes; a case having an upper portion and a lower portion, the lower portion having a space for mounting the electrode assembly, the case having a sealing region at the periphery of and between each of the upper portion and the lower portion; and a sealant directly on a respective protruding electrode of the plurality of protruding electrodes at the sealing region, the sealant comprising a fracture area configured to rupture when the upper portion and the lower portion are sealed at the sealing region and when internal pressure within the battery reaches a predetermined rupture pressure, wherein the fracture area comprises a groove tapering toward the interior of the sealant, the sealant further comprising a non-fracture area, and wherein the groove comprises a plurality of grooves tapering toward the interior of the sealant from an internal or external side of the case.