| 摘要 |
<p>Disclosed is a primary dry cell, and particularly a magnesium cell, incorporating a fail-safe vent in the seal closure for the cell container, wherein the seal closure includes an annular insulating cover fitting tightly around the central carbon electrode rod forming a juncture therebetween which is tightly sealed except for a gas-venting passageway formed by complementary portions of the cover and carbon electrode rod. During normal operation of the cell, the gas-venting passageway is closed by a normally solid fusible sealant material. The sealant has a softening or melting point which substantially corresponds to some critical high internal cell temperature at which it is necessary to vent gas from inside the cell.</p> |
