Patent ID: 8435658

Claim:
A sealed cell comprising: a bottomed cylindrical outer can; and a sealing body caulked and sealed around an opening of the outer can, wherein the sealing body includes: a terminal cap, the terminal cap including an external terminal projecting toward an outside of the sealed cell, a flange portion in a periphery of the external terminal, and one or more gas releasing holes for releasing a gas from inside to outside of the cell, the gas releasing holes being provided in the external terminal; and a safety valve, the safety valve including a conductive contact portion projecting toward an inside of the sealed cell, a peripheral portion in a periphery of the conductive contact portion, a circularly formed notch, and two or more break grooves formed radially in the peripheral portion and communicated with the notch, wherein at least one of the gas releasing holes overlap with at least one of break grooves in a planar view of the sealed cell, wherein: the number of the gas releasing holes is the same as that of the break grooves; and each of the gas releasing holes overlaps a corresponding one of the break grooves in planar view of the sealed cell.