| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium-ion secondary battery which prevents internal short circuit without reducing large-current discharge performance, even if it is oscillated, and which is superior in reliability for long-time use. <P>SOLUTION: The lithium-ion secondary battery 20 is equipped with an electrode group 6 in which a positive electrode, having a positive electrode lead piece 2 formed in a comb shape on one side along the longitudinal direction, and a negative electrode, having a negative lead piece 3 formed in the comb shape on one side along the longitudinal direction are wound round via a separator, and in which the positive and negative electrode lead pieces are led out to mutually opposite sides in the vertical direction. The tip part of the positive electrode lead piece 2 is jointed to the outer peripheral face of a positive electrode current collecting ring 11, and the tip part of the negative electrode lead piece is jointed to the outer peripheral face of a negative electrode current collecting ring. Moreover, this is equipped with an insulating body 10 to cover the positive electrode lead piece 2 from the outer peripheral part upper end face of the positive electrode current collecting ring 11, over the upper part of the electrode group 6. The insulating body 10 can prevent direct contact of a gasket and the positive electrode lead piece, and prevent cut of the positive electrode piece 2. <P>COPYRIGHT: (C)2010,JPO&INPIT |
