| CPC H01M 50/109 (2021.01) [H01M 10/0427 (2013.01); H01M 50/154 (2021.01); H01M 50/181 (2021.01)] | 12 Claims |
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1. A button cell comprising:
an electrode assembly comprising a first electrode, a second electrode, and a separator between the first electrode and the second electrode;
a case connected to the first electrode and accommodating the electrode assembly, and comprising an opening to receive the electrode assembly;
a cap plate coupled with the case to cover an outer area of the opening, and comprising a through-hole penetrating upper and lower surfaces of the cap plate to expose a central area of the opening; and
a terminal plate connected to the second electrode and insulation-bonded to the cap plate via an insulating member arranged between the terminal plate and the cap plate, the terminal plate comprising a flange portion covering the through-hole, and a protrusion penetrating the through-hole from the flange portion,
wherein the protrusion comprises a curved surface extending from a surface of the flange portion, and
wherein an inner surface of the cap plate that extends between the upper and lower surfaces so as to define the through-hole is exposed toward the protrusion, an open space being defined from the inner surface of the cap plate to the protrusion such that a gas may pass from an interior of the case through the open space.
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