Patent ID: 9219267
Filing Date: 2015-12-22
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery comprising: an electrode assembly comprising a first electrode plate that comprises an uncoated portion formed along an end of the first electrode plate, a second electrode plate that comprises an uncoated portion formed along an end of the second electrode plate, and a separator that is interposed between the first electrode plate and the second electrode plate, wherein the first and second electrode plates and the separator are wound so that the uncoated portion of the first electrode plate and the uncoated portion of the second electrode plate are arranged in opposite directions; a groove formed in at least one of the uncoated portions of the first and second electrode plates, wherein the at least one of the uncoated portions is a first uncoated portion; and a current collector comprising a lead tab that is bent passing the groove so that a first portion of the lead tab contacts a first side surface of the first uncoated portion and a second portion of the lead tab contacts a second side surface of the first uncoated portion wherein the electrode assembly has a shape having two parallel outer flat surfaces and two outer curved surfaces interconnecting the parallel outer flat surfaces, and the first side surface and the second side surface of the first uncoated portion are respectively located on the outer flat surfaces and wherein the groove extends between the first and second side surfaces.