Rechargeable battery

A rechargeable battery, comprising:

• an electrode assembly performing charging and discharging;
• a case accommodating the electrode assembly;
• a cap plate coupled with the case;
• an electrode terminal in a terminal hole of the cap plate, the electrode terminal being electrically connected to the electrode assembly;
• and
• an insulator electrically insulating the electrode terminal and the cap plate,
• wherein the insulator includes:
• a first member between an outside of the cap plate and a surface of the electrode terminal facing the cap plate, and
• a second member enclosing an outer surface of the electrode terminal and the first member and being coupled with the first member with a step structure,
• wherein the first member includes:
• a plate portion between the outside of the cap plate and the surface of the electrode terminal facing the cap plate, and
• a frame portion on the plate portion, the frame portion protruding away from the cap plate and enclosing the outer surface of the electrode terminal, and
• wherein the plate portion includes a peripheral region that outwardly extends in parallel with a surface of the cap plate and away from a region from which the frame portion protrudes.