CYLINDRICAL BATTERY
A cylindrical battery according to one embodiment of the present disclosure has a bottomed cylindrical outer casing can, and a sealing body that closes the opening of the outer casing can. The sealing body has: a rupture plate in which an annular thin section is formed; and an annular insulation plate positioned on the inner-surface side of the rupture plate so as to face the thin section. The rupture plate includes a valve part surrounded by the thin section, the valve part including a latching part that extends toward the radially outer side of the rupture plate so as to cover at least the inner peripheral part of the inner surface of the insulation plate.
1 . A cylindrical battery comprising:
an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed between the positive electrode and the negative electrode;
an electrolyte;
a bottomed cylindrical exterior housing can that houses the electrode assembly and the electrolyte; and
a sealing assembly that seals an opening of the exterior housing can,
wherein the sealing assembly has a rupture disk in which an annular thin part is formed, and an annular insulating plate that is disposed in an inner face side of the rupture disk to face the thin part,
the rupture disk includes a vent part surrounded by the thin part, and
the vent part includes an engaging part that extends toward an outer side in a radial direction of the rupture disk to cover at least an inner peripheral portion of an inner surface of the insulating plate.
2 . The cylindrical battery according to claim 1 , wherein
a tip position of the engaging part is located on the outer side in the radial direction of the rupture disk with respect to the thin part.