| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electricity storage device which can efficiently manufacture an electrode group composed of positive electrodes and negative electrodes in a short time, and has a structure preferable for achieving high output. <P>SOLUTION: An electrode group 11 of a lithium-ion capacitor is formed by using a band-shaped negative electrode 31, a band-shaped separator 41, and a plurality of positive electrodes 21 which are not bent and have a flat-plate shape. The electrode group 11 has a structure in which the band-shaped negative electrode 31 and the band-shaped separator 41 are superimposed and folded in a bellows-shape, and in which the flat-plate shaped positive electrodes 21 are put between flat portions of the folded negative electrode 31 through the separator 41. In the electrode group 11, an electrode area of the positive electrode 21 is smaller than an electrode area of the negative electrode 31, and the outer periphery of the positive electrode 21 is disposed on an inner side of the outer periphery of the negative electrode 31 in a plane view. <P>COPYRIGHT: (C)2012,JPO&INPIT |
