Patent ID: 9123948
Filing Date: 2015-09-01
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery comprising an electrode assembly, wherein the electrode assembly comprises: a first electrode plate having a rectangular prism shape with two long sides, two short sides and two surfaces, said short sides being shorter than said long sides and said first electrode plate is provided with a first tab portion extending from one of the two short sides of the first electrode plate and with an edge that is flush to solely one of the two long sides of the first electrode plate; a second electrode plate having a rectangular prism shape with two long sides, two short sides and two surfaces, said short sides being shorter than said long sides and said second electrode plate is provided with a second tab portion extending from one of the two short sides of the second electrode plate and with an edge that is flush to solely one of the two long sides of the second electrode plate; and a separator interposed between the electrode plates, wherein at least one of the first and second tab portions are formed so that the width of each of the tab portions and the distance from a central portion of each of the electrode plates to a starting portion of each of the tab portions satisfy the following expressions, and wherein the interval between the first and second tab portions is in the range from over 0 mm to less than 500 mm, where “a” is a width of each of the tab portions, “b” is a distance from a central portion of each of the electrode plates to a starting portion of each of the tab portions, and “x” is ½ of an entire width of each of the electrode plates.