| 摘要 |
PROBLEM TO BE SOLVED: To provide nonaqueous electrolyte secondary batteries that are high in volumetric energy density and excellent in charge-discharge cycle characteristic if assembled together and a battery assembly in which a plurality of these secondary batteries are combined. SOLUTION: In a nonaqueous electrolyte secondary battery, provided with strips of electrodes in which strips of positive and negative electrodes are stacked with separators between them, and having a spiral electrode 5 formed by winding the strips of electrodes into a spiral, the spiral electrode 5 is formed into a hexagonal cross-sectional shape, and the hexagonal spiral electrode 5 is enclosed in a hexagonal cylindrical battery can 6. This battery assembly is formed by closely combining a plurality of nonaqueous electrolyte secondary batteries 1 side by side, in parallel with one another, and connecting the nonaqueous electrolyte secondary batteries 1 in parallel or series with one another. |
