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A power supply assembly includes an enclosure body, a cover panel mounted to the enclosure body, a power supply unit, and a positioning element. The enclosure body includes a bottom panel, a rear panel, and a side panel. The power supply unit is mounted in the enclosure body and is prevented from mo

A power supply assembly includes an enclosure body, a cover panel mounted to the enclosure body, a power supply unit, and a positioning element. The enclosure body includes a bottom panel, a rear panel, and a side panel. The power supply unit is mounted in the enclosure body and is prevented from moving in a first direction substantially perpendicular to the rear panel and a second direction substantially perpendicular to the side panel. The positioning element includes a plate body, a first positioning portion, and a second positioning portion. The power supply unit is sandwiched between the bottom panel and the plate body. The first positioning portion is for preventing the power supply unit from moving along a first direction substantially parallel to the bottom panel. The second positioning portion for preventing the power supply unit from moving along a second direction parallel to the bottom panel.

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1. A power supply assembly, comprising: an enclosure body comprising a bottom panel, a rear panel substantially perpendicular to the bottom panel, and a side panel substantially perpendicular to the bottom panel and the rear panel;a cover panel mounted to the enclosure body and substantially paralle

1. A power supply assembly, comprising: an enclosure body comprising a bottom panel, a rear panel substantially perpendicular to the bottom panel, and a side panel substantially perpendicular to the bottom panel and the rear panel;a cover panel mounted to the enclosure body and substantially parallel to the bottom panel;a power supply unit mounted in the enclosure body, the power supply unit disposed between the bottom panel and the cover panel; anda positioning element mounted between the power supply unit and the cover panel, the positioning element comprising a plate body, a first positioning portion extending from the plate body, and a second positioning portion extending from the plate body, the power supply unit sandwiched between the bottom panel and the plate body, the first positioning portion for preventing the power supply unit from moving along a first direction substantially parallel to the bottom panel, the second positioning portion for preventing the power supply unit from moving along a second direction parallel to the bottom panel;wherein the plate body comprises a larger portion and a narrower portion extending from the larger portion; the first positioning portion extends from the larger portion, and the second positioning portion extends from the narrower portion; and the enclosure body further comprises a drive bracket, and the plate body placed between the rear panel and the drive bracket. 2. The power supply assembly of claim 1, wherein a first mounting opening is defined in the rear panel, and the plate body comprises a first supporting portion corresponding to the first mounting opening. 3. The power supply assembly of claim 2, wherein the first supporting portion is L-shaped. 4. The power supply assembly of claim 2, wherein a second mounting opening is defined in the drive bracket, and the plate body comprises a second supporting portion corresponding to the second mounting opening. 5. The power supply assembly of claim 1, wherein the positioning element further comprises an elastic tab extending from the plate body, the elastic tab elastically abutting the cover panel. 6. The power supply assembly of claim 1, wherein the power supply unit defines a front surface and a first side surface substantially perpendicular to the front surface, the first positioning portion contacting the first side surface, and the second positioning portion contacting the front surface. 7. The power supply assembly of claim 1, wherein an airflow opening is defined in the rear panel corresponding to the power supply unit; the rear panel comprises a plurality of protrusions adjacent to the airflow opening, and a plurality of positioning holes is defined in the power supply unit corresponding to the protrusions. 8. The power supply assembly of claim 1, wherein an airflow opening is defined in the rear panel corresponding to the power supply unit; the rear panel comprises a first resisting plate and a second resisting plate extending from opposite sides of the airflow opening. 9. A power supply assembly, comprising: a power supply unit; andan enclosure body, the enclosure body comprising a bottom panel, a rear panel substantially perpendicular to the bottom panel, and a side panel substantially perpendicular to the bottom panel and the rear panel, the enclosure body receiving the power supply unit to enable the power supply unit only to move along a first direction substantially perpendicular to the bottom panel;a cover panel mounted to the enclosure body, the cover panel substantially parallel to the bottom panel; anda positioning element mounted between the cover panel and the power supply unit, the positioning element comprising a plate body, a first positioning portion extending from the plate body, and a second positioning portion extending from the plate body, the power supply unit sandwiched between the bottom panel and the plate body, the first positioning portion contacting the power supply unit for preventing the power supply unit from moving along a second direction substantially parallel to the bottom panel, the second positioning portion contacting the power supply unit for preventing the power supply unit from moving along a third direction that is substantially parallel to the bottom panel and substantially perpendicular to the second direction;wherein an airflow opening is defined in the rear panel corresponding to the power supply unit; the rear panel comprises a plurality of protrusions adjacent to the airflow opening, and a plurality of positioning holes is defined in the power supply unit corresponding to the protrusions. 10. The power supply assembly of claim 9, wherein the plate body comprises a larger portion and a narrower portion extending from the larger portion; the first positioning portion extends from the larger portion, and the second positioning portion extends from the narrower portion. 11. The power supply assembly of claim 10, wherein the enclosure body comprise a drive bracket, the plate body placed between the rear panel and the drive bracket. 12. The power supply assembly of claim 11, wherein a first mounting opening is defined in the rear panel, and the plate body comprises a first supporting portion corresponding to the first mounting opening. 13. The power supply assembly of claim 12, wherein the first supporting portion is L-shaped. 14. The power supply assembly of claim 12, wherein a second mounting opening is defined in the drive bracket, and the plate body comprises a second supporting portion corresponding to the second mounting opening. 15. The power supply assembly of claim 9, wherein the positioning element further comprises an elastic tab extending from the plate body, the elastic tab abutting elastically the cover panel. 16. The power supply assembly of claim 9, wherein the power supply unit defines a front surface and a first side surface substantially perpendicular to the front surface, the first positioning portion contacting the first side surface, and the second positioning portion contacting the front surface. 17. The power supply assembly of claim 9, wherein the rear panel comprises a first resisting plate and a second resisting plate extending from opposite sides of the airflow opening. 18. A power supply assembly, comprising: an enclosure body comprising a bottom panel, a rear panel substantially perpendicular to the bottom panel, and a side panel substantially perpendicular to the bottom panel and the rear panel; an airflow opening defined in the rear panel; the rear panel comprising a first resisting plate and a second resisting plate extending from opposite sides of the airflow opening;a cover panel mounted to the enclosure body and substantially parallel to the bottom panel;a power supply unit mounted in the enclosure body, the power supply unit disposed between the bottom panel and the cover panel; the power supply unit is aligned with the airflow opening; the power supply unit is disposed between the first resisting plate and the second resisting plate; and the first resisting plate and the second resisting plate prevent the power supply unit from moving along a first direction substantially parallel to the bottom panel; anda positioning element mounted between the power supply unit and the cover panel, the positioning element comprising a plate body, a first positioning portion extending from the plate body, and a second positioning portion extending from the plate body; the power supply unit sandwiched between the bottom panel and the plate body; the first positioning portion prevents the power supply unit from moving along the first direction, the second positioning portion prevents the power supply unit from moving along a second direction parallel to the bottom panel and substantially perpendicular to the first direction. 19. The power supply assembly of claim 18, wherein the rear panel comprises a plurality of protrusions adjacent to the airflow opening, and a plurality of positioning holes is defined in the power supply unit corresponding to the protrusions.