| 摘要 |
PURPOSE:To prevent occurrence of defects caused at the time of welding by press- fixing a negative electrode to a negative electrode terminal plate and at the same time, forming a concave portion on the opposite face of the negative electrode to the press-fixed face and after mounting a cell, welding a lead terminal on a portion of the negative electrode terminal plate corresponding to the concave portion. CONSTITUTION:When a negative electrode 20 is press-fixed to a negative electrode terminal plate 12 of a flat type cell by using a metal mold, at the same time a concave portion 20b is formed on the opposite face of the negative electrode 20 to the press-fixed face. Furthermore, the negative electrode 20 press-fixed to the negative electrode terminal plate 12, a separator 18 and a positive electrode can 10 press-fixed to a positive electrode black mix 16 are combined together and sealed with sealing gasket 14 and thus a cell is made up. Thereafter, a lead terminal 22 made of a beltlike metal plate is spot-welded upon a portion of the surface of the negative electrode terminal plate 12 corresponding to just above the concave portion 20b as a welding point 24, and thus a cell with a lead terminal is completed. As a result, even though the negative electrode 20 is somewhat fused by heat at the time of welding, it is limitted within the clearance of the concave portion 20b and can not pass through the separator 18. Therefor, the occurrence of defectives can be effectively prevented. |
