| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the service life performance of a battery, by suppressing non-uniform and accelerative deterioration caused by stress generated repeatedly in the short-axis direction of the surface, where a laminated structure of an electrode group is exposed during charging and discharging, in a non-aqueous electrolyte secondary battery provided with elliptical electrode groups. <P>SOLUTION: In the non-aqueous electrolyte secondary battery, in which positive electrodes, negative electrodes, and separators are wound and made as the elliptical electrode groups, and in which the electrodes and current collectors are mutually connected and fixed at a plurality of places of the surface where the laminated structure of the electrode groups is exposed and sealed into a metallic outer package, when the thickness of the center and the thickness of the boundary part between a flat part and a curve part in the short-axis direction of the surface, where the laminated structure of the electrode groups is exposed are made as T1 and T2, respectively, and the inner width of the center of the long side in the opening part of the outer package is set as T3, the relations 0≤(T2-T1)/T2<0.05, 0.9×T3<T1≤T3, and 0.9×T3<T2≤T3 are satisfied. <P>COPYRIGHT: (C)2007,JPO&INPIT |
