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A system is disclosed. The system includes a thermally conductive enclosure bounding an interior cavity, a metallic cell wall structure disposed within the cavity, in thermal communication with the enclosure, and defining a plurality of cells, and a phase change material disposed within the cells an

A system is disclosed. The system includes a thermally conductive enclosure bounding an interior cavity, a metallic cell wall structure disposed within the cavity, in thermal communication with the enclosure, and defining a plurality of cells, and a phase change material disposed within the cells and in thermal communication with the cell walls. The plurality of cells have a cell width less than about 5 millimeters, and the cell wall thickness of the cell wall structure is in a range from about 0.25 millimeter to about 1 millimeter.

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1. A system, comprising: a thermally conductive enclosure bounding an interior cavity;a metallic cell wall structure disposed within the cavity and in thermal communication with the enclosure, the structure comprising: a plurality of cells, wherein each cell comprises cell walls defining a cell volu

1. A system, comprising: a thermally conductive enclosure bounding an interior cavity;a metallic cell wall structure disposed within the cavity and in thermal communication with the enclosure, the structure comprising: a plurality of cells, wherein each cell comprises cell walls defining a cell volume, a cell width less than about 5 millimeters, and a cell wall thickness in a range from about 0.25 millimeter to about 1 millimeter;a phase change material disposed within the cells and in thermal communication with the cell walls; anda thermal conductor disposed in thermal communication with the enclosure and the metallic cell wall structure, wherein the thermal conductor comprises one end embedded within the enclosure. 2. The system of claim 1, wherein the cell width is greater than about 0.5 millimeter. 3. The system of claim 1, wherein the cell width is less than about 2 millimeters. 4. The system of claim 1, wherein a total cell porosity within the interior cavity is in a range from about 50% to about 88%. 5. The system of claim 4, wherein the total cell porosity within the interior cavity is in a range from about 70% to about 85%. 6. The system of claim 1, wherein a ratio of the surface area of the cell walls to the cell volume is in a range from about 50 m2/m3 to about 1500 m2/m3. 7. The system of claim 1, wherein the thermal conductor comprises a heat pipe, copper rod, aluminum rod, diamond rod, graphite conductor, or any combinations thereof. 8. The system of claim 7, wherein the enclosure, thermal conductor, cell wall structure, and the phase change material within the cells are respectively disposed in thermal communication. 9. The system of claim 1, wherein the cell walls have a corrugated structure. 10. The system of claim 1, wherein the metallic cell wall structure is a monolithic conductor. 11. The system of claim 9, wherein the metallic cell wall structure comprises a heat pipe, a vapor chamber, or a combination of heat pipe and vapor chamber. 12. The system of claim 1, wherein the cell walls comprise an anti-corrosive, hydrophilic, or a combination of anti-corrosive and hydrophilic coating. 13. The system of claim 1, comprising multiple cell wall structures disposed in the cavity. 14. The system of claim 1, wherein the phase change material comprises an inorganic material having solid to liquid transformation at the operating temperature of the interior cavity. 15. The system of claim 1, wherein the enclosure is a monolithic conductor. 16. The system of claim 1, wherein the enclosure comprises a vapor chamber structure, embedded heat pipe, or a combination of vapor chamber structure and embedded heat pipe. 17. A system, comprising: a thermally conductive enclosure bounding an interior cavity;a metallic cell wall structure disposed within the cavity and in thermal communication with the enclosure, the structure comprising: a plurality of cells, wherein each cell comprises cell walls defining a cell volume, a cell width less than about 5 millimeters, and a cell wall thickness in a range from about 0.25 millimeter to about 1 millimeter;a phase change material disposed within the cells and in thermal communication with the cell walls; anda heat pipe disposed in thermal communication with the enclosure and the cell wall structure, wherein the heat pipe comprises one end embedded in the enclosure. 18. A system, comprising: an enclosure having a vapor chamber structure bounding an interior cavity;a metallic cell wall structure disposed within the cavity, the structure comprising: a heat pipe, a vapor chamber, or a combination of heat pipe and vapor chamber;a plurality of cells, wherein each cell comprises cell walls defining a cell volume, a cell width less than about 5 millimeters, and a cell wall thickness in a range from about 0.25 millimeter to about 1 millimeter;a phase change material disposed within the cells and in thermal communication with cell walls; anda thermal conductor disposed in thermal communication with the enclosure and the metallic cell wall structure, wherein the thermal conductor comprises one end embedded within the enclosure and wherein the thermal conductor comprises at least one of copper rod, aluminum rod, diamond rod, and graphite conductor.