| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary battery capable of preventing short-circuiting inside the battery. <P>SOLUTION: A lithium ion secondary battery 40 has a bottomed cylindrical battery container 1. An electrode group 7 in which a positive electrode 13 and a negative electrode 14 are wound around via separators 19 and 20 is housed inside the battery container 1. A positive electrode current collector member 5 and a negative electrode current collector member 6 are respectively arranged on both end faces of the electrode group 7 so as to be opposed to each other. A plurality of positive electrode tabs 11 and a plurality of negative electrode tabs 12 are bonded to outer peripheral surfaces of the positive electrode current collector member 5 and the negative electrode current collector member 6, respectively. Each of the positive electrode tabs 11 has an extension part 11s which further extends from a portion bonded to the positive electrode current collector member 5. The extension part 11s is bent outward and is covered with an insulation member 31. The battery container 1 also serves as a negative electrode external terminal. An opening of the battery container 1 is sealed with a lid which also serves as a positive electrode external terminal. Compared with a case where the extension part 11s is cut, less metal powder is produced by cutting. <P>COPYRIGHT: (C)2012,JPO&INPIT |
