NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME

摘要

Objects of the invention are to provide a nonaqueous electrolyte secondary battery in which an electrode assembly is prevented from damages caused when the electrode assembly is inserted into a battery case and in which the ease for the electrode assembly to be impregnated with an electrolytic solution is improved/and to provide a method for manufacturing such batteries. The invention pertains to a nonaqueous electrolyte secondary battery including an electrode assembly and a battery case accommodating the electrode assembly, the electrode assembly including a positive electrode plate having a positive electrode active material layer disposed on a positive electrode current collector and a negative electrode plate having a negative electrode active material layer disposed on a negative electrode current collector, the positive electrode plate and the negative electrode plate being wound together into a coil through a separator, the electrode assembly being fastened with a rectangular or square fixing tape applied to cover the end of the coil, the side of the fixing tape in contact with the electrode assembly including self-adhesive portions having a pressure-sensitive adhesive and a non-adhesive portion having no pressure-sensitive adhesive, the self-adhesive portions being disposed at both ends of the non-adhesive portion in the direction of the width of the fixing tape so that the non-adhesive portion is interposed between the self-adhesive portions, the battery satisfying 0.9≦Wb/Wa≦1 and 0.35≦Wc/Wa≦0.8 wherein Wa is the height of the electrode assembly, Wb is the width of the fixing tape and Wc is the width of the non-adhesive portion.

主权项

1. A nonaqueous electrolyte secondary battery comprising an electrode assembly and a battery case accommodating the electrode assembly, the electrode assembly including a positive electrode plate having a positive electrode active material layer disposed on a positive electrode current collector and a negative electrode plate having a negative electrode active material layer disposed on a negative electrode current collector, the positive electrode plate and the negative electrode plate being wound together into a coil through a separator, the electrode assembly being fastened with a rectangular or square fixing tape applied to cover the end of the coil,
the side of the fixing tape in contact with the electrode assembly including self-adhesive portions having a pressure-sensitive adhesive and a non-adhesive portion having no pressure-sensitive adhesive, the self-adhesive portions being disposed at both ends of the non-adhesive portion in the direction of the width of the fixing tape wherein the direction of the width of the fixing tape is the direction of the height of the electrode assembly, the battery satisfying 0.9≦Wb/Wa≦1.05 and 0.35≦Wc/Wa≦0.85 wherein Wa is the height of the electrode assembly, Wb is the width of the fixing tape and Wc is the width of the non-adhesive portion.