| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat secondary battery having improved volume efficiency. SOLUTION: The lithium ion secondary battery 20 includes a positive electrode plate having a tab on one side along the longitudinal direction, a negative electrode plate having a tab on one side along the longitudinal direction, a flat wound group 3 wound around a winding core via a separator with the tabs 8 of positive and negative electrodes led-out in mutually opposite directions, a plane positive electrode collecting plate 8 which is fixed to the winding core 1 and to which the tab of the positive electrode is joined, a plane negative electrode collecting plate which is fixed to the winding core 1 on the opposite side to the positive electrode collecting plate 8 and to which the tab of the negative electrode is joined, electrolytic solution in which the wound group 3 is immersed, and a flat battery case 11 storing the members. Leg parts 14 are formed by cutting the positive and negative electrode collecting plates at one longitudinal side and fitted to the wound group 3. COPYRIGHT: (C)2010,JPO&INPIT
|
