NOVELTY - The case has a coating layer formed with a particle/liquid form oxygen scavenger that is adhered in an inner wall of a case body. The coating layer absorbs oxygen generated in the oxygen scavenger and separated from an electrode assembly. An electrode tap-lead coupling unit is united with an electrode lead that is fixed with lower and upper ends of the inner wall of the case body. The coating layer is laminated on an electrode tap. An electrode terminal is extended from the electrode assembly that is combined with the case body. The case body comprises gas membrane and saccharides material.    USE - Case for a battery e.g. lithium ion battery and a lithium ion polymer battery/lithium polymer battery, of a battery module of a battery pack of a power source device and a vehicle e.g. electric vehicle, hybrid electric vehicle and plug-in hybrid electric vehicle (all claimed).    ADVANTAGE - The coating layer is formed with the oxygen scavenger that is arranged with the inner wall of the case so as to prevent a by-product from being deformed, avoid swelling phenomenon due to oxygen generated in the battery and improve performance and safety of the battery.    DETAILED DESCRIPTION - The gas membrane is made of polyethylene terephthalate. The electrode assembly is provided with an anode that comprises lithium transition-metal oxide, aluminum, magnesium, nickel, cobalt, iron, chromium, vanadium, titanium, copper, boron, calcium, zinc, zirconium, niobium, molybdenum, stronium, antimony, lungten and bismuth. The oxygen scavenger comprises ascorbic acid, iso cor beak acid, gallic acid, salts, tocopherol, hydroquinone catechol, resorcin, dibutylhydroxytoluene, dibutyl butyl hydroxyl anisol, pyrogallol, rongalite, saccharides material, lignin, glucose, iron base material, thio sulfate, dithionite, hydrogen sulfite, electron exchange resin, resin metal complex and zeolite. The saccharides material comprises fructose, sucrose, glucose, galactose, lactose, maltose, starch and dextrin. INDEPENDENT CLAIMS are also included for the following:    (1) a battery    (2) a power source device.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of a case.