Hermetic battery

摘要

A hermetic battery including: a safety valve through which gas generated in the battery due to increase in pressure in the battery is discharged outside the battery, wherein the safety valve includes a first safety valve 9a, 10 which is operated at a first operating pressure, and a second safety valve 15a which is operated at a second operating pressure higher than the first operating pressure, a rate at which the gas is discharged while the second safety valve 15a is operated is higher than a rate at which the gas is discharged while the first safety valve 9a, 10 is operated, and the first safety valve 9a, 10 is closed at least while the second safety valve 15a is operated.

主权项

1. A hermetic battery comprising:
a safety valve through which gas generated in the battery due to increase in pressure in the battery is discharged outside the battery, wherein: the safety valve includes a first safety valve configured to operate at a first operating pressure, and a second safety valve configured to operate at a second operating pressure higher than the first operating pressure, the first safety valve is configured to discharge the gas at a first rate while the first safety valve operates, the second safety valve is configured to discharge the gas at a second rate while the second safety valve operates, the second rate being larger than the first rate, and the first and second safety valves are configured such that the first safety valve which has operated and been opened at the first operating pressure is again closed at least before the second safety valve operates, the first safety valve includes:
a valve element provided in the battery and configured to break when the pressure in the battery reaches the first operating pressure; anda vent hole which is formed in a sealing plate sealing an opening of a battery case to discharge the gas generated in the battery outside the battery through the broken valve element, and the first safety valve is configured such that part of the broken valve element is deformed due to increase in pressure in the battery, and closes the vent hole at least at the second operating pressure.