| 摘要 |
PURPOSE:To prevent an occurrence of an internal short circuit due to the melting of lithium during welding by forming a lithium negative electrode with a thickness of 0.6mm. or more stuck by pressure to the inner surface of a negative electrode terminal plate corresponding to a welding point where a lead terminal is spot-welded. CONSTITUTION:A positive electrode 3 is stored in a positive electrode can 5 and is faced to a negative electrode 7 through a separator 6. The negative electrode 7 is constituted by inserting disk-like metal lithium and pressing it into contact with a negative electrode terminal plate 2. An electrolyte is filled inside the positive electrode can 5 and terminal plate 2 and they are sealed by an annular gasket 9. Then, the tip of a lead terminal 1 is compressed into a flat portion 1a, which is stuck by pressure to the surface of the terminal plate 2 and is spot-welded. And a lead terminal 11 is welded to the surface of the positive electrode can 5. The lithium negative electrode 7 stuck by pressure to the inner surface of the terminal plate 2 corresponding to a welding point where the terminal 1 is welded is formed to a thickness of 0.6mm. or more, and an internal short circuit can be prevented against the welding of the terminal 1 having the portion 1a with a thickness of 0.2-0.4mm.. |
