Patent ID: 6258487
Filing Date: 2001-07-10
Classification: H01M,Y02E,Y02P

Abstract:
A lithium secondary battery comprising:an internal electrode body contained in the battery case and including a positive electrode, a negative electrode, and a separator made of porous polymer, the positive electrode and the negative electrode being wound through the separator in a winding direction so that the positive electrode and the negative electrode are not brought into direct contact with each other;wherein at least one of said positive and negative electrodes is a divided electrode, said divided electrode comprising at least two separate distinct base layers, each of said at least two base layers having electrode material coated thereon; andwherein, when said divided electrode is a positive electrode, said at least two separate base layers are separated from each other in a lengthwise direction by a gap sufficient to prevent a flow of current between said at least two separate base layers, and when said divided electrode is a negative electrode, said at least two separate base layers are touching so no gap exists between them.