NOVELTY - The membrane assembly contains bipolar membrane containing an anionic layer contacting electrolyte base, a cationic layer (13) contacting electrolyte acid and an intermediate layer (15) separating anionic layer and cationic layer.    USE - For galvanic cell and electronic system (both claimed) such as rechargeable fuel cell and metal battery.    ADVANTAGE - The bipolar membrane of the membrane assembly reduces carbondioxide poisoning of the cathode and water evaporation rate of fuel cell.    DETAILED DESCRIPTION - The membrane assembly is disposed in alkaline metal hydride rechargeable fuel cell assembly. The anionic layer and the cationic layer of membrane assembly contains polymer comprising polystyrene, poly(styrene-divinylbenzene), polysulfone, polyvinylidene fluoride, polyvinylidene halide, polyphenyleneoxide, polyamide, polyvinylchloride, polyetherimide, polycarbonate, polyethylene and/or polypropylene. The anion layer comprises pendant basic functional group(s) containing amide (-NH2), amine (=NH), nitride (?=N), quaternary ammonium, quaternary sulfonium, quaternary phosphonium, quaternary arsonium, quaternary antimonium, and/or hydrosulfide groups. The cationic layer comprises a polymer with acidic functional groups containing functional groups derived from sulfonic acids, carboxylic acids, phosphonic acids and/or hydroxyl groups. The galvanic cell comprises anode (17), and cathode (19) comprising catalyst layer and gas diffusion layer. The catalyst layer comprises carbon black, binder and catalyst containing metal catalyst, metal oxide catalyst, and/or perovskite catalyst. The gas diffusion layer comprises carbon black and a binder. The anode of galvanic cell comprises an active material, a binder, and conductive additive(s). The active material is a metal hydride, and the binder comprises polytetrafluoroethylene and/or carboxymethylcellulose. The conductive additive comprises carbonyl nickel powder.    DESCRIPTION OF DRAWING(S) - The figure shows the exploded view depicting a bipolar membrane structure.    Cationic layer (13)    Intermediate layer (15)    Anode (17)    Cathode (19)    Bipolar membrane structure (21)