| 摘要 |
PROBLEM TO BE SOLVED: To stuff a large quantity of active material in a battery container and to realize high capacity of a lithium ion secondary battery by establishing a predetermined relationship among distances from each of a separator end on the battery can opening side of an electrode element, an electrode end on the battery can opening side and the central position of a seam part to the outside bottom face. SOLUTION: A cylindrical battery is manufactured by receiving a wound structure electrode element in a bottomed cylinder-like battery can, forming an annular seam part swelling inward on the opening side of the battery can and thereafter reducing the outside diameter of the battery can. When it is assumed that the distances from a separator end, an electrode end and the central position of the seam part to the outside bottom are S, E and A, respectively, the relationship E<A<=S is made to be established. The electrode element is fixed by being caught by the seam part and the can bottom at its upper and lower parts before reducing the diameter, so that it is in capable of moving vertically in the battery can. Because the power generation element is not pushed up towards the battery can opening even at the time the outside diameter of the battery can bottom part is partly shrunk, no space is produced between the battery can bottom and the electrode element even after the completion of the diameter reducing process. |
