Patent ID: 7985498
Filing Date: 2011-07-26
Classification: H01M,Y02E

Abstract:
1. A lithium secondary battery comprising: a first electrode plate having a first polarity, wherein the first electrode plate has a coated portion coated with an active material and an uncoated portion at a first end region and at a second end region not coated with the active material; a second electrode plate having a second polarity that is different from the first polarity, wherein the second electrode plate has a coated portion coated with the active material and an uncoated portion at a first end region and at a second end region not coated with the active material; a separator located between the first electrode plate and the second electrode plate; an electrolytic solution to conduct electrons between the first electrode plate and the second electrode plate; and a porous ceramic film coated on the active material of the first electrode plate, and a first surface of the uncoated portion at the first end region of the first electrode plate, wherein the first electrode plate, the second electrode plate, and the separator are wound into a jelly-roll type electrode assembly, such that a region of the ceramic film contacts the separator and the first electrode plate such that the uncoated portion at the first end region of the first and second electrode plates are located adjacent to an outer surface of the electrode assembly, and the first surface of the uncoated portion of the first end region of the first electrode plate faces a winding center of the electrode assembly.