Rechargeable electric energy accumulator with metal-air electrochemical cell with continuous flow of oxidant and anti-degradation devices

A rechargeable electric energy accumulator comprising a metal-air electrochemical cell, or battery, and an oxygen and nitrogen separator/concentrator connected to said battery and configured for separating and concentrating separately the oxygen and nitrogen present in the air, wherein said battery comprises a container made of non-conductive material inside of which a reaction chamber is defined, said reaction chamber containing at least one metal anode, at least one cathode, connected to said oxygen and nitrogen separator/concentrator, and an electrolyte placed in contact with said at least one metal anode and at least one cathode, wherein said battery comprises:

• means for inertization of the anode by interposing an inert gas between said at least one anode and said electrolyte when the battery is not in use,
• one or more ultrasonic piezoelectric transducers configured for cleaning the anode, positioned near the edge of said container and/or on the surface of said at least one anode, so that they are immersed in said electrolyte, said piezoelectric ultrasonic transducers generating a continuous ultrasonic pressure wave, with frequency modulation configured for generating the detachment from said at least one anode of a by-product of the reaction of the anode by resonance, and with time and frequency phase shift of the waves of the individual piezoelectric transducers such that the sum of the wave crests creates a pressure front which translates, causing a displacement of said by-product towards the bottom of said container,
• and wherein said oxygen and nitrogen separator/concentrator (5) comprises an oxygen outlet and a nitrogen outlet, said oxygen outlet being hydraulically connected to said reaction chamber through an oxygen inlet nozzle placed in proximity of said cathode.