| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid a winding deviation in a winding step by suppressing curvature of an electrode caused by an elongation difference between a formed part and an unformed part of an active material layer at the time of pressing the electrode. <P>SOLUTION: A nonaqueous electrolyte secondary battery has a cathode 14 in which an active material layer 15 is partially formed on a surface of an aluminum foil and is rolled in the thickness direction. The aluminum foil has a plurality of open holes 24a, 24b, and an aperture ratio of a formed part 14b of the aluminum foil where the active material layer 15 is formed, is smaller than an aperture ratio of an unformed part 14a where the active material layer 15 is not formed. Even when the aluminum foil of the formed part 14b where the active material layer is formed, is subjected to a greater pressure than the pressure the unformed part 14a is subjected to, an elongation of the aluminum foil in the formed part can be suppressed to the same extent as the unformed part 14a. <P>COPYRIGHT: (C)2013,JPO&INPIT |
