| 摘要 |
PURPOSE:To uniformalize and ensure the tightening state of a gasket without uneven distribution and improve the resistance to leakage sharply by providing a linear section with a uniform inner diameter between a tapered drawing section and a crimping section of a mold. CONSTITUTION:A linear section 36 with a uniform inner diameter is inserted between a tapered section 32 and a shoulder section 34. As a result, a battery case 10 guided to the tapered section 32 of a mold 30 is drawn by being advanced through the inner part of the tapered section 32. Then the battery passes through the linear section 36 and is pressed on the shoulder section 34 and then is crimped As a result, the battery case 10 permits its external surface to be corrected into a vertical surface shape by the linear section 36. As a result, an accurate press-contact state can be obtained without uneven distribution of the contact between the aperture section inner side 12 of a positive electrode case section 12 and a gasket 16 and between the aperture section outer side 12c of a negative electrode side case section 14 and gasket 16. |
