NOVELTY - The tank comprises a longitudinal axis, a liner formed of a first part and a second part, an assembly plate (2), heat exchangers each contained in one of the first and second parts, spaces for hydrogen storage material, a unit for connecting the heat exchanger to a heat transfer agent supplying and evacuating unit, a unit for connecting a hydrogen exchange to a hydrogen supplying and collecting unit, braces, and connection chambers. The first and second parts have a shell (3) comprising a first closed longitudinal end and a second open longitudinal end.    USE - The tank is useful for storing hydrogen in the form of hydride (claimed) such as metallic hydride, and in vehicles, where the hydrogen is useful in fuel cells to produce electricity.    ADVANTAGE - The tank is highly resistant to mechanical impacts, enables long-term storage of hydrogen, and can be easily fabricated with reduced mass.    DETAILED DESCRIPTION - The tank comprises a longitudinal axis, a liner formed of a first part and a second part, an assembly plate (2), heat exchangers each contained in one of the first and second parts, spaces for hydrogen storage material, a unit for connecting the heat exchanger to a heat transfer agent supplying and evacuating unit, a unit for connecting a hydrogen exchange to a hydrogen supplying and collecting unit, braces, and connection chambers. The first and second parts have a shell (3) comprising a first closed longitudinal end and a second open longitudinal end, and are joined at their respective second open longitudinal ends by the assembly plate. The interior volumes of the two parts are intended to be at the same pressure. The heat exchanger connection unit is integrated into the assembly plate. Each shell has a barrel and a hemispherical bottom forming the closed first longitudinal end. The heat exchangers have tubes, where heat exchange fluid circulates in the two parts of the tank. The assembly plate has a cavity for the distribution of heat transfer agent into which the first tubes of the heat exchanger open, and an evacuation cavity into which the second tubes of the heat exchanger open. Each first tube is connected to the second tube on the level of a hemispherical part (6). The assembly plate is composed of two half plates between which the distribution and evacuation cavities are formed. The braces are: longitudinally directed between the half-plates; and present in the shape of bobbin. The assembly plate has a radial aperture opening into the distribution cavity and the evacuation cavity. The apertures are connected to the heat transfer agent supplying and evacuating unit. The first tubes of the two heat exchangers open into the same distribution cavity, and the second tubes of the two heat exchangers open into the same evacuation cavity. The connection chambers are situated on the level of each of the first closed longitudinal ends of the shells into which the first and second tubes open. The braces are positioned in one of the connection chambers. Each first and second tubes of each heat exchanger form a U-tube, where a bottom of the U-tube is situated on the level of the first closed longitudinal ends of the shells. The hydrogen exchange connection unit includes a connection tube going through the wall of the barrel or the assembly plate of the first part and going through the barrel of the second part or the assembly plate. The hydrogen connection tubes form a "crow foot" connection directly interconnecting the hydrogen pressure chambers of first and second parts. Each of the parts includes a flange. The part is fixed to the assembly plate by the flange, a unit of screw and nut sets and by welding. The spaces for the hydrogen storage material are formed by the heat exchangers. An INDEPENDENT CLAIM is included for a method of fabricating a tank.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cut away view of a tank.    Assembly plate (2)    Shell (3)    First longitudinal end (4.1)    Second longitudinal end (4.2)    Hemispherical part (6)    Cavity. (22)