| 摘要 |
PURPOSE:To suppress sparks at the time of welding while increasing welding strength by providing a plate collector with tongues by nicks while welding their projection edges and terminal edges of a group of electrodes. CONSTITUTION:Terminal edges 7 and 7' of positive and negative electrodes respectively of a spiral group of electrodes are projected and at least one of them, for instance, the terminal edge 7 is welded with a collector 12. The collector 12 consists of a plate 1 and a lead tab 2. The plate 1 is provided with almost U-shaped or almost V-shaped nicks 3 to form tongues 13. Projection edges 4 are formed on the peripheries of the tongues 13 or on the outer peripheries of the nicks 3. Welding electrodes 5 are made to contact with the tongues 13 to flow a welding current under fixed pressure to weld the projections 4 with the terminal edges 7. A reactive current flowing to the collector 12 reduces by the nicks 3 while the welding current concentrates on the projection edge 4 so that no spark is generated and welding strength is increased. |
