| 摘要 |
PURPOSE: To prevent formation of a short-circuiting circuit even if battery vessels contact each other by interposing an insulator between a battery element and an inner wall of a metallic vessel, and electrically insulating the battery vessels from a positive electrode, a negative electrode and electrolyte. CONSTITUTION: Belt-like negative electrode 1 and positive electrode 2 are rolled up in a roll shape by sandwiching a porous polypropylene separator 3 between them, and are formed as a wound body, and a battery element is manufactured. At this time, in a negative electrode lead 5 and a positive electrode lead 7, winding is started by setting both electrodes to project in the same direction from the outside and from a central part of the wound body. An insulating sheet 14 is arranged on an end surface of the battery element from which an electrode lead projects, and the negative electrode lead 5 and the positive electrode lead 7 projecting from the battery element are respectively welded to an external terminal 6 of a negative electrode and an external terminal 8 of a positive electrode fixed to a battery cover body 9 by sandwiching polypropylene packing 11. The battery element is housed in an aluminum battery can 4 by fitting a polypropylene bottomed tube 10 in its inside. |
