| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe cylindrical battery of which rupture caused by generated internal gas is avoided. SOLUTION: The opening edge of a vessel in which power generation elements of positive electrode and negative electrode are housed, and a resin insulation gasket 106 comprising an inner peripheral support 112 and an annular sidewall 110 which works as both an insulator and a flange 111 incorporating, on the inner periphery, a thin wall 113 where a crack is generated by the gas pressure in the vessel, are bent in the inner peripheral direction to seal the opening. A heat-resistant ring 109 is provided on the inside of the annular sidewall 110 of the resin insulation gasket 106. The rupture is avoided as the outer diameter of the heat-resistant ring 109 is equal to or smaller than the inner diameter of the annular sidewall 110 while the inner diameter of the heat-resistant ring 109 is equal to or larger than 65% of the flange 111. COPYRIGHT: (C)2005,JPO&NCIPI
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