cathode terminal 51 and the anode terminal 52 are installed at the terminal holes h 1 and h 2 of the cap plate 40 and are electrically coupled to the electrode assembly 30 that is the cathode terminal 51 is electrically coupled to the cathode 31 of the electrode assembly 30 and the anode terminal 52 is electrically coupled to the anode 32 of the electrode assembly 30 accordingly the electrode assembly 30 is coupled to the outside of the case 35 through the cathode terminal 51 and the anode terminal 52 the cathode terminal 51 and the anode terminal 52 are formed to have a similar structure or shape inside the cap plate 40 so that the same structure will be described together however the cathode terminal 51 and the anode terminal 52 are formed to have different structures or shapes outside the cap plate 40 so that the different structures will be separately described the cathode and anode terminals 51 and 52 include rivet terminals 51 a and 52 a installed at or inserted into the terminal holes h 1 and h 2 of the cap plate 40 respectively flanges 51 b and 52 b are wider than rivet terminals 51 a and 52 a respectively and may be integrally formed.