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    • 3. 发明授权
    • Secondary cell
    • 二次电池
    • US06562508B1
    • 2003-05-13
    • US09385454
    • 1999-08-30
    • Kouichi SatohNaoya NakanishiKazuyasu FujiwaraToshiyuki NohmaIkuo Yonezu
    • Kouichi SatohNaoya NakanishiKazuyasu FujiwaraToshiyuki NohmaIkuo Yonezu
    • H01M212
    • H01M2/1241H01M2/04H01M10/052
    • A secondary cell comprises a gastight can 1 having a cylinder 11 and a lid 12 fixed to an opening portion of the cylinder, and a secondary cell element accommodated in the can 1. The lid 12 is fixedly provided with a gas vent closure 4 in the form of a disk and having a diaphragm 42 openable upon the internal pressure of the can 1 exceeding a predetermined value. The gas vent closure 4 has an outer peripheral portion welded to an opening edge defining a through bore 14 formed in the lid 12. The lid 12 is formed in a front surface thereof with a circumferential groove 5 surrounding the welded portion of the gas vent closure 4, and a diminished portion 51 is provided between the groove 5 and the welded portion for reducing the sectional area of a heat flow path for the heat of welding to pass therethrough. The lid 12 thus constructed makes it possible to weld the vent closure 4 to the lid 12 free of defects such as pinholes or cracks.
    • 二次电池包括具有气缸11和固定到气缸的开口部分的盖12的气密罐1和容纳在罐1中的二次电池元件。盖12固定地设置有气体排出盖4 盘的形式,具有在罐1的内部压力超过预定值时可开启的隔膜42。 排气口4具有焊接到限定形成在盖12中的通孔14的开口边缘的外周部分。盖12在其前表面上形成有周围槽5,周向槽5包围气体通气口的焊接部分 如图4所示,并且在槽5和焊接部分之间设置有减小部分51,用于减小焊接热通过的热流路的截面面积。 如此构造的盖12使得能够将通气口4焊接到盖12,而没有诸如针孔或裂缝的缺陷。