| abstract |
The present invention provides a high-output, and long-life nonaqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery includes: an electrode group which is formed by winding a positive electrode 5 including an active material layer formed on a surface of a current collector, and a negative electrode 6 including an active material layer formed on a surface of a current collector with a porous insulator 7 interposed therebetween, and is sealed in a battery case, wherein the electrode group is configured in such a manner that uniform surface pressure is applied to turns of the positive electrode 5 , the negative electrode 6 , and the porous insulator 7 during the winding. |