NOVELTY - The battery has an electrode assembly including electrodes, and a separator interposed between the electrodes. A cap assembly is attached to a case, and includes a cap plate (151) with an opening (151c). A short-circuiting member includes an inverting portion (161a) provided within the opening of the cap plate being in communication with and projecting into interior of the case and an edge portion (161b) having a fixing portion (161c) i.e. welding portion, fixed to the cap plate. A recess (161d) is formed in a surface of the edge portion contacting the cap plate.    USE - Secondary battery e.g. cylindrical type secondary battery and prismatic type secondary battery, for use in a compact electronic device i.e. cellular phone or camcorder.    ADVANTAGE - The battery is protected by inducing a short circuit between the electrodes when internal pressure of the case increases. The recess enhances flexibility of the short-circuiting member. The battery includes a hole and protrusion at regions of a short-circuiting plate corresponding to an inverted portion, thus reducing contact resistance when the inverted portion performs an inverting operation and allowing the inverted portion to contact the short-circuiting plate in a secured manner. The separator is positioned between the electrodes to prevent electrical short between the electrodes and to allow for movement of lithium ions. The battery includes a gasket that prevents external moisture from infiltrating into the battery and electrolyte injected into the battery from flowing out. The battery provides a charging operation by a positive electrode terminal and a negative electrode terminal in discontinued manner, so that the internal pressure of the case is suspended from increasing, thus protecting the battery. The recess reduces a contact area between a bottom surface of the edge portion and the cap plate, so that the edge portion provides flexibility to the inverted portion during inverting, thus allowing the inverted portion to easily perform the inverting at desired level of internal pressure, and hence increasing reliability of the battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a portion of a secondary battery.    Cap plate (151)    Opening of cap plate (151c)    Inverting portion (161a)    Edge portion (161b)    Fixing portion (161c)    Recess (161d)