| 摘要 |
A prismatic nonaqueous electrolyte secondary battery of the invention includes a process whereby a cylindrical electrode roll is produced by spirally rolling negative electrode plates made of elongated sheet-like negative electrode substrates to which is applied a negative electrode mixture containing negative electrode active material, and positive electrode plates made of elongated sheet-like positive electrode substrates to which is applied a positive electrode mixture containing positive electrode active material, insulated from each other by separators; and then the cylindrical electrode roll is crushed to be formed into a flattened electrode roll; the process of crushing the cylindrical electrode roll to form a flattened electrode roll being controlled so that, in the flattened electrode roll the ratio of change in the separator gas permeability between the winding start and the winding end is 55% or less of the gas permeability at the winding start. By providing such a configuration, a prismatic nonaqueous electrolyte secondary battery and a method for manufacturing the same can be obtained, in which gas permeability of separators does not increase during manufacturing of a flattened electrode roll thereby making possible to achieve a high discharge output.
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