NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery with excellent charge/discharge cycle characteristics and preservation characteristics. SOLUTION: The nonaqueous electrolyte secondary battery is composed of: an electrode plate group made by winding around a cathode plate 11 and an anode plate 12 through a separator consisting of two or more layers porous resin; nonaqueous electrolyte; and an outer package body housing the electrode plate group and the nonaqueous electrolyte. (1) The separator is made by laminating two or more layers of separators with different coefficients of elasticity in a thickness direction, and (2) a formula of (K-/K)>1.1 is satisfied on condition that a coefficient of elasticity of a layer in contact with an anode in a thickness direction is K-, and that of a layer with the least coefficient of elasticity in the thickness direction is K. COPYRIGHT: (C)2006,JPO&NCIPI