Patent ID: 9531011
Filing Date: 2016-12-27
CPC Classification: H01M,Y02E,Y02P

Claim Text:
1. A wound electrode assembly using an electrode plate configured by applying an active material onto a base member formed of a punching steel plate, the electrode plate being wound via a separator together with an electrode plate, which has a different polarity, and having an outermost peripheral portion positioned at an outermost periphery of the electrode assembly, wherein a rate of hole area per unit area of the base member at a different electrode overlapping portion, which radially inwardly overlaps on a winding terminal end of the electrode plate having the different polarity, is smaller than that of the base member at the outermost peripheral portion, and wherein a packing density of the active material at the outermost peripheral portion is less than a packing density of the active material at other portions than the outermost peripheral portion.