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Disclosed is a fuel unit for a gas generator such as a hydrogen gas generator that can supply gas to a gas consuming system such as a fuel cell system. The fuel unit includes a housing containing a solid fuel composition and a heat producing material. The fuel composition contains gas releasing soli

Disclosed is a fuel unit for a gas generator such as a hydrogen gas generator that can supply gas to a gas consuming system such as a fuel cell system. The fuel unit includes a housing containing a solid fuel composition and a heat producing material. The fuel composition contains gas releasing solid material that reacts to release gas when heated. The heat producing material reacts exothermically to produce heat. A plurality of quantities of the heat producing material are in thermal communication with corresponding portions of an unsegregated quantity the fuel composition such that, following initiation of a reaction of each quantity of the heat producing material, the quantity of heat producing material will heat the corresponding portion of the unsegregated quantity of the fuel composition, and the corresponding portion of the unsegregated quantity of the fuel composition will react to release a quantity of the gas.

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1. A fuel unit for a gas generator comprising a housing containing a solid fuel composition and a heat producing material, wherein: the solid fuel composition comprises a gas releasing solid material that can react to release hydrogen gas when heated;the heat producing material can react exothermica

1. A fuel unit for a gas generator comprising a housing containing a solid fuel composition and a heat producing material, wherein: the solid fuel composition comprises a gas releasing solid material that can react to release hydrogen gas when heated;the heat producing material can react exothermically to produce heat;a plurality of quantities of the heat producing material are disposed in thermal communication with corresponding portions of an unsegregated quantity of the solid fuel composition such that, following initiation of a reaction of each quantity of the heat producing material, the quantity of heat producing material will heat the corresponding portion of the unsegregated quantity of the solid fuel composition, and the corresponding portion of the unsegregated quantity of the solid fuel composition will react to release a quantity of the hydrogen gas;the gas releasing solid material comprises alane;the heat producing material comprises one or more of LiAlH4/B(OH)3, LiAlH4/Al(OH)3, and (GBH)/AlH3; andthe plurality of quantities of the heat producing material are disposed partially within and in direct contact with the unsegregated quantity of the solid fuel composition. 2. The fuel unit according to claim 1, wherein the gas-releasing solid material will not undergo a self-sustaining exothermic reaction following initiation of a gas releasing reaction. 3. The fuel unit according to claim 1 wherein the heat producing material comprises LiAlH4/B(OH)3. 4. The fuel unit according to claim 1, wherein the heat producing material comprises LiAlH4/Al(OH)3. 5. The fuel unit according to claim 1, wherein the heat producing material comprises (GBH)/AlH3. 6. The fuel unit according to claim 1, wherein the housing comprises a plurality of conductive sections for conducting one of heat and electric energy through the housing. 7. The fuel unit according to claim 6, wherein the fuel unit comprises a plurality of initiators for initiating the reaction of the heat-producing material in the plurality of quantities of the heat producing material. 8. The fuel unit according to claim 7, wherein the initiators are disposed within the housing. 9. The fuel unit according to claim 7, wherein the initiators are disposed outside the housing. 10. The fuel unit according to of claim 7, wherein the initiators comprise at least one thermal initiator. 11. The fuel unit according to claim 7, wherein the initiators comprise at least one electrical initiator. 12. The fuel unit according to claim 1, wherein the fuel unit comprises a plurality of the unsegregated quantities of the solid fuel composition. 13. The fuel unit of claim 1, wherein the reaction of the heat producing material in the plurality of quantities of heat producing material is selectively initiated to selectively release the hydrogen gas from the corresponding portions of the solid fuel composition. 14. A gas generator, comprising: a first housing;a plurality of fuel units, each comprising: a second housing containing a solid fuel composition and a heat producing material, wherein the solid fuel composition comprises a gas releasing solid material that can react to release hydrogen gas when heated;wherein the heat producing material can react exothermically to produce heat;a plurality of quantities of the heat producing material are disposed in thermal communication with corresponding portions of an unsegregated quantity of the solid fuel composition such that, following initiation of a reaction of each quantity of the heat producing material, the quantity of heat producing material will heat the corresponding portion of the unsegregated quantity of the solid fuel composition, and the corresponding portion of the unsegregated quantity of the solid fuel composition will react to release a quantity of the hydrogen gas; and,an energy source for supplying electric energy for initiation of the reaction of the quantities of heat producing material;wherein the gas releasing solid material comprises alane;wherein the heat producing material comprises one or more of LiAlH4/B(OH)3, LiAlH4/Al(OH)3, and (GBH)/AlH3; andwherein the plurality of quantities of the heat producing material are disposed partially within and in direct contact with the unsegregated quantity of the solid fuel composition. 15. The gas generator of claim 14 wherein the gas-releasing solid material will not undergo a self-sustaining exothermic reaction following initiation of a gas releasing reaction. 16. The gas generator of claim 14 wherein each fuel unit is in a separate first housing.