NOVELTY - An alloy powder is a mixture comprising particles of primary hydrogen storage alloy having AB5-type crystal structure and particles of secondary hydrogen storage alloy chosen from hydrogen storage alloy (a) having AB2-type crystal structure and hydrogen storage alloy (b) having AB3-type crystal structure. The alloy (a) contains element (L2), nickel, and element (E2). The alloy (b) contains element (L3), element (M2), and nickel. The element (L2) is group-4 element of periodic table chosen from titanium and zirconium.    USE - Alloy powder is used as active material of negative electrode used for nickel hydride storage battery (all claimed) used as power supply of electric vehicle.    ADVANTAGE - The alloy powder provides nickel hydride storage battery with high capacity, and suppresses the occurrence of short circuit in the nickel hydride storage battery due to self discharge.    DETAILED DESCRIPTION - An alloy powder is a mixture comprising particles of primary hydrogen storage alloy having AB5-type crystal structure and particles of secondary hydrogen storage alloy chosen from hydrogen storage alloy (a) having AB2-type crystal structure and hydrogen storage alloy (b) having AB3-type crystal structure. The content of primary hydrogen storage alloy in the mixture is more than 50 %mass. The alloy (a) contains element (L2), nickel, and element (E2). The element (L2) is group-4 element of periodic table chosen from titanium and zirconium. The element (E2) is transition metal element chosen from group-5-14 elements of periodic table, or phosphorus. The sum of molar ratio of nickel and molar ratio of element (L2) and element (E2) in the alloy (a) is 1.5-2.5. The alloy (b) contains element (L3), element (M2), and nickel as essential components, and element (E3) as arbitrary component. The element (L3) is chosen from group-3 element and group-4 element of periodic table. The element (M2) is alkaline-earth metal element. The element (E3) is transition metal element chosen from group-5-14 elements of periodic table, phosphorus, nitrogen, or sulfur. The sum of molar ratio of nickel with respect to element (L3) and element (M2), and molar ratio of element (E3) in the alloy (b) is 2.5-4.5. An INDEPENDENT CLAIM is included for nickel hydride storage battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of the structure of nickel hydride storage battery.    Negative electrode (1)    Positive electrode (2)    Separator (3)    Battery case (4)    Safety valve (6)