| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a battery in which contact of a positive electrode and a negative electrode active material layers is suppressed and function of the battery is stopped by promptly lowering the potential of the positive electrode and raising the potential of the negative electrode, when the battery is exposed to an abnormal state, and thereby reliability of the battery is remarkably improved. <P>SOLUTION: The battery has a structure in which a wound electrode body 5 wound around in spiral form is contained in a metallic outer package can, and the metallic outer package can and a negative electrode plate are electrically connected. A positive electrode plate is arranged through a separator 3 in the outermost periphery of the wound electrode body, and a current collector exposed part 1c which projects more than a winding terminal part 3a of the separator 3 and in which the positive electrode active material layer 1b does not exist is installed on the winding terminal side in the outermost periphery of the positive electrode plate, and the battery outside face of this current collector exposed part 1c is covered with a low-density polyethylene film 20. <P>COPYRIGHT: (C)2010,JPO&INPIT |
