| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery case with an outside part of an electrode group hardly damaged at its insertion, with an electrode plate hardly distorted at its swelling at initial charging, capable of restraining increase of thickness of the electrode group, and capable of reducing increase of thickness of batteries and unevenness of thicknesses among the batteries, as well as a nonaqueous electrolyte secondary battery equipped with the battery case, and a manufacturing method of the nonaqueous electrolyte secondary battery. SOLUTION: The battery case 1 is provided with a bottom plate part 11, first side plate parts 12, 12 set around the bottom plate part 11 in contact with flat parts of outside faces of the electrode group, and second side plate parts 13, 13 adjacent to the first side plate parts 12, 12. A part of the battery case 1 is press processed, the first side plate part 12 is of a trapezoid in plane cross-section view consisting of a flat part in contact with the above flat part of the electrode group and slanted parts from the flat part over to both end parts. Further, the first side plate part 12 is of an arc shape in elevated cross-section view with a center part recessed inward. COPYRIGHT: (C)2008,JPO&INPIT |
