Patent ID: 8815451
Filing Date: 2014-08-26
Classification: H01M,Y02E,Y02P

Abstract:
1. A negative-electrode plate holding a negative-electrode active material for use in a cylindrical cell intended to be laid over a positive-electrode plate holding a positive-electrode active material with a separator interposed to separate the negative-electrode plate and the positive-electrode plate and rolled to form a cylindrical electrode body with the positive-electrode plate inside, the cylindrical electrode body being arranged in a bottomed cylindrical outer can to form the cylindrical cell, comprising: a negative-electrode core body with a negative-electrode active material held on both sides; a first negative-electrode part which is to face the positive-electrode plate on both sides, with the separator between, when formed into the electrode body, and a second negative-electrode part which is to form the innermost circumference of the electrode body and face the positive-electrode plate on only one side, with the separator between, when formed into the electrode body, the second negative-electrode part being lower in the negative-electrode active material density than the first negative-electrode part, and wherein the negative-electrode active material completely covers both sides of the negative-electrode core body of the second negative-electrode part.