TANK AND SYSTEM FOR STORING COMPRESSED GAS, E.G. COMPRESSED HYDROGEN, VEHICLE AND SYSTEM AND METHOD FOR SUPPLYING GAS TO A TANK

A tank for storing compressed gas, e.g. compressed hydrogen, comprises a vessel (2;11) having an interior closed by a vessel wall (3;12) for containing gas inside the vessel (2;11); a barrier (7;16), arranged in the interior of the vessel (2;11) and separating gas in a first compartment (8;17) in the interior of the vessel (2;11) from gas in a second compartment (9;18) formed between the barrier (7;16) and an interior surface of the vessel wall (3;12); at least one first connection device (5;14;27), connectable to a system (22;24) external to the tank, for exchanging gas between that system (22;24) and the first compartment (8;17); and at least one second connection device (6;15;28), connectable to a system (22;24) external to the tank, for exchanging gas between that system (22;24) and the second compartment (9;18). The barrier (7;16) is variable in shape through movement of at least part of the barrier (7;16) towards the interior surface of the vessel wall (3;12) on supply of gas to the first compartment (8;17) in combination with a discharge of gas from the second compartment (9;18).