密闭型电池及密闭型电池的制造方法

Sealed battery and producing method therefor

Abstract

The invention provides a sealed battery which can guarantee conduction between a power generator and a cover body without generating a welding defect. A lithium ion secondary battery includes a battery container (7). The battery container (7) houses an electrode winding body, on which positive and negative electrode plates are wound via separators, together with a non-aqueous electrolytic solution. A positive electrode tab is bonded to a positive current collector ring (4) arranged at an upper side of the electrode winding body. A battery lid (18) to be a positive electrode external terminal is crimped and fixed to the battery container (7). The battery lid (18) has a diaphragm in which a cleaving valve (12) is formed. A coupling part is bonded to the diaphragm, and a stack lead (9) with a plurality of thin plates being laminated is bonded to the coupling part. In the stack lead (9), a total sum t of thicknesses of the thin plates is not more than a thickness T of the coupling part. Melting from the stack lead (9) to the coupling part by laser irradiation is optimized.
本发明提供一种密闭型电池,其能够不产生焊接缺陷地确保发电体及盖体间的电导通。锂离子二次电池(20)具有电池容器(7)。在电池容器(7)中收容有正负极板隔着隔板回卷而成的电极回卷体(6)及非水电解液。在配置于电极回卷体(6)的上侧的正极集电环(4)上接合有正极接头(2)。作为正极外部端子的电池盖(18)压紧固定于电池容器(7)。电池盖(18)具有形成有开裂阀(12a)的隔片(12)。在隔片(12)上接合有连接部件(14),在连接部件(14)上接合有由多张薄板层叠而成的层叠引导件(9)。在层叠引导件(9)中,薄板的厚度的总和(t)为连接部件(14)的厚度(T)以下。基于激光照射的从层叠引导件(9)向连接部件(14)的熔入被适当化。

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    CN-102610828-AJuly 25, 2012Sb锂摩托有限公司二次电池
    CN-102610828-BJuly 21, 2017三星Sdi株式会社, 罗伯特-博世有限公司二次电池