| 摘要 |
PROBLEM TO BE SOLVED: To enhance the utilization factor of a vessel inside space, and to realize high capacity by alternately laminating plural disk-shaped unipolar electrodes, plural disk-shaped multipolar electrodes, having a diameter smaller than these and a separator having a diameter between those of both electrodes on an electrode bar penetrating through these electrodes and the separator, and housing the outer periphery of the unipolar electrodes so as to contact with the inside surface of a bottomed cylindrical vessel. SOLUTION: A metallic current collecting bar 12, having the disk-shaped positive electrode terminal part 11 is directly electrically connected to a disk-shaped positive electrode 5, and is insulated from a disk-shaped negative electrode 4 having the outer periphery contacting with a vessel 1 through an insulating ring 7. Both electrodes 4, 5 are alternately stacked by interposing a polypropylene nonwoven fabric disk-shaped separator 6 having a diameter larger than the disk-shaped positive electrode 5 and smaller than the disk-shaped negative electrode 4, and an electrode group 3 having the separator 6 is also arranged in the uppermost/lowest layers. Thus, the respective electrodes 4, 5 are formed as high density, an internal short circuit is caused by burrs, and reduction in current collecting efficiency by falling-out of an active material can be avoided. Thus, the separator thickness can be thinned, and high capacity is obtained. |
