NOVELTY - A rechargeable battery comprises: an electrode assembly (15) having a first electrode (11), a second electrode (12), and a separator (13) interposed between the first and the second electrodes (11,12), the first electrode (11) and the second electrode (12) with the separator (13) in-between are being wound into a jelly-roll; a case (14) for mounting the electrode assembly (15) in it; and an insulating member (30, 41, 42, 43, 50) being disposed between side walls of the case (14) and the electrode assembly (15) to insulate the case (14) from the electrode assembly (15).    USE - The rechargeable battery is useful for small portable electronic device such as a mobile phone, a laptop computer, and a camcorder, and for other electronic devices.    ADVANTAGE - The rechargeable battery is highly efficient, reliable and has enhanced performance.    DETAILED DESCRIPTION - A rechargeable battery comprises: an electrode assembly (15) having a first electrode (11), a second electrode (12), and a separator (13) interposed between the first and the second electrodes (11,12), the first electrode (11) and the second electrode (12) with the separator (13) in-between are being wound into a jelly-roll; a case (14) for mounting the electrode assembly (15) in it; and an insulating member (30, 41, 42, 43, 50) being disposed between side walls of the case (14) and the electrode assembly (15) to insulate the case (14) from the electrode assembly (15), where the insulating member (30, 41, 42, 43, 50) comprises a base (31, 51) in contact with the bottom of the case (14); a first insulating plate (32, 52); a second insulating plate (34, 54); a third insulating plate (36, 56); and a fourth insulating plate (38, 58), where all four insulating plates are attached to the base (31, 51) and are arranged to face the four side surfaces of the electrode assembly (15), respectively, where an exploded-view of the insulating member (30, 41, 42, 43, 50) has the form of a cross, and the wound electrode assembly (15) comprises flat parts (15a) in its middle region and convex parts (15b) in its lower and upper side parts, where the surfaces of the first and second insulating plates (32, 52; 34, 54) being in contact with the electrode assembly (15) are formed such that their shape corresponds to the shape of the surface of the electrode assembly (15) having flat and convex parts (15a, 15b), where the first insulating plate (32, 52) comprises a first supporting part (32a, 52a) and the second insulating plate (34, 54) comprises a second supporting part (34a, 54a), where the supporting parts (32a, 52a; 34a, 54a): are flat where they contact the respective flat part (15a) of the electrode assembly (15), and slanted or curved in the region of the respective convex part (15b) of the electrode assembly (15) to correspond to the shape of the electrode assembly (15).    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of as rechargeable battery.    Positive electrode (11)    Negative electrode (12)    Case (14)    Electrode assembly (15)    Cap plate (17)    Positive terminal (21)    Negative terminal (22)    Nut (25)    Gasket (28)    Insulating member (30)    Base (31)    First insulating plate (32)    Second insulating plate (34)    Third insulating plate (36)    Fourth insulating plate (38)    Rechargeable battery (100)