| 摘要 |
PROBLEM TO BE SOLVED: To improve the reduction of adhesiveness of an active material and an electrode plate core body even if one face of the negative electrode is cut. SOLUTION: An open hole 11 is formed which is composed of a single hole 12 formed by vertically die-cutting at one time on a plate face of the electrode plate core body 10 by punching, and a composite hole 13 in which a first hole 14 and a second hole 15 are formed by half-punching from both front and rear faces of the plate face. At this time, the center position of the first hole 14 and the second hole 15 is shifted, and the hole is formed so that the first and the second holes are communicated with each other. By this, because the ratio of a contact area inside the hole and an aperture area of the composite hole 13 is made larger than that of a contact area inside the open hole and the aperture area, omission of the active material is suppressed. COPYRIGHT: (C)2005,JPO&NCIPI
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