(US5304432-A)      The rechargeable battery comprises (a) a bipolar stack at least one membrane flow cell comprising (i) an anode electrolyte inlet leading to a channel formed by a 1st surface of an anion membrane and a 1st surface of a bilayer membrane, (ii) a basic electrolyte inlet leading to a channel formed by a 1st surface of a cation membrane and the 2nd surface of the bilayer membrane, and (iii) a salt outlet where salt soln. is transferred from a salt soln. fluid flow channel formed by the 2nd surface of the anion membrane and 2nd surface of the cation membrane, (b) a cathode flow compartment where H2 is generated, located at one end of the bipolar stack and comprising (i) a cathode electrolyte inlet with a fluid flow channel formed by a cathode anion membrane and a fuel cell cathode, and (ii) an H2 outlet, H2 flowing from a channel formed by the fuel cell cathode and 1st battery end plate, (c) an anode flow compartment where H2 is consumed from a voltage, located at 2nd end of the bipolar stack, and comprising (i) an anode electrolyte inlet with a fluid flow channel formed by an anode cation membrane and a fuel cell anode, and (ii) an H2 inlet, with an H2 flow channel formed by the anode and 2nd battery end plate, (d) means to transfer H2 from the inlet to outlet, and (e) means to transfer the electric potential to an electric load.    USE -   Used to power vehicles, giving acceptable acceleration, high speed and range. Lightweight and corrosion resistant, with decreased activation polarisation and increased cycled life.    (JP6223858-A)      A rechargeable battery for generating electrical potential by acidic and basic electrolytes flowing in fluid-flow channels between ionic membranes comprises: (a) a bipolar stack of at least one membrane flow cell (10,12,14) where ionic charges moving across an ion membrane form membrane potentials, the flow cell comprising: (i) an acidic electrolyte inlet (11) through which acidic electrolyte is introduced into an acidic flow channel (16) formed by first surface (18) of an anion membrane (20) and a first surface (22) of a bilayer membrane (24); (ii) a basic electrolyte inlet (26) to a basic flow channel (28) formed by a first surface (30) of a cation membrane (32) and a second surface (34) of a bilayer membrane (24); and (iii) a salt outlet (36) through which salt is transferred from a salt soln. flow channel (38); (b) a cathode flow compartment (44), wherein H2 is generated from the membrane potential, being located at one end of the bipolar stack and comprising: (i) a cathode electrolyte inlet (54) through which cathode electrolyte is introduced into cathode flow channel (56); and (ii) a H2 outlet (61) through which H2 flows from a first H2 flow channel (63); (c) an anode flow compartment (46), wherein H2 is consumed to form the voltage, being located at a second end of the bipolar stack and comprising: (i) an anode electrolyte inlet (64) to an anode flow channel (66); and (ii) a H2 inlet (82) to a H2 flow channel (84); (d) a means for transferring H2 from H2 outlet to H2 inlet; (e) a means for transferring electrical potential from the rechargeable battery to a load.    Also claimed is a method for generating electrical potential by means of the above battery.    USE/ADVANTAGE -   Used as batteries for levelling electrical loads, powering electric vehicles and spacecraft instrumentation, etc. Provides a lightweight, corrosion-resistant battery with lower activation polarisation, and increased cycle life. It provides enhanced power density and energy density.