| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a safety mechanism operate normally even in case of an accident. <P>SOLUTION: An exhaust valve having a function which operates when an inner pressure in a case 4 reaches a prescribed pressure, and liberates a generated gas in the case to the outside, and a perforated plate 2 which has hole parts 5a, 5b, and which is installed between an electrode group 3 and the exhaust valve are provided. Area of the perforated plate 2 except the hole parts 5a, 5b is 20% or more and 50% or less as against that of an aperture of the case. The perforated plate 2 has a function to electrically insulate the electrode group 3 and a sealing plate 1. <P>COPYRIGHT: (C)2008,JPO&INPIT |
