NOVELTY - The capsule container (2) is accommodated in hydrogen-storage tank (1) which discharges hydrogen from hydrogen occlusion alloy (MH). The container is deformable with respect to expansion during hydrogen storage and shrinkage during hydrogen desorption, and is packed with the occlusion alloy. The container has ventilation hole (2d) in which leakage of hydrogen occlusion alloy is prevented by support structure (3,4,6).    USE - For hydrogen-storage tank (claimed) used in fuel cells of electric vehicles for storing hydrogen as fuel.    ADVANTAGE - The capsule container is deformable with respect to expansion during hydrogen storage and shrinkage during hydrogen desorption. The amount of hydrogen emitted is increased, suppressing the precipitate accompanying pulverization of hydrogen occlusion alloy. Thus, damage on hydrogen-storage tank as pressure vessel is prevented. The capsule container improves the durability of hydrogen-storage tank. The peripheral surface of the capsule container carries out heat conduction of hydrogen occlusion alloy effectively. The action of excessive external force of hydrogen occlusion alloy on the inner bottom portion of the tank is prevented. Thus, deformation and damage of tank wall surface in the location where packing density of hydrogen occlusion alloy becomes larger, is suppressed.    DETAILED DESCRIPTION - The capsule container (2) is accommodated in a hydrogen-storage tank (1) which discharges hydrogen from a hydrogen occlusion alloy (MH), and supplies hydrogen to the exterior of the tank. The container is accommodated in a gap provided in the hydrogen-storage tank. The container is deformable with respect to expansion during hydrogen storage and shrinkage during hydrogen desorption, and is packed with a hydrogen occlusion alloy. The container has a ventilation hole (2d) in which leakage of hydrogen occlusion alloy is prevented by a support-structure component (3,4,6) which lets hydrogen pass. An INDEPENDENT CLAIM is included for hydrogen-storage tank.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional drawing of hydrogen-storage tank. (Drawing includes non-English language text).    hydrogen-storage tank (1)    capsule container (2)    ventilation hole (2d)    support structure (3,4,6)    hydrogen occlusion alloy (MH)