| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a cell capable of suppressing variation in the working pressure of a safety valve, while limiting increase in the number of steps during formation of a safety valve. <P>SOLUTION: The manufacturing method of a cell includes a step for forming a safety valve by performing discharge processing of the central part of the bottom face 11 of an outer case 1 comprised of Al or Al alloy, thereby softening the material at least of the central part of the bottom face 11 while thinning. <P>COPYRIGHT: (C)2013,JPO&INPIT |
