Side sill assembly for eco-friendly vehicle

1. A side sill assembly for an eco-friendly vehicle, the side sill assembly comprising:

a center member fastened to a side surface of a center floor panel of the eco-friendly vehicle;

a front outer member fastened to a front end of the center member; and

a rear outer member fastened to a rear end of the center member,

wherein each of the center member, the front outer member, and the rear outer member has a cylindrical cross-section and at least one partition wall configured to partition an inside thereof horizontally and vertically to absorb collision energy upon side collision,

wherein the center member comprises:

an outer housing formed on a widthwise outside of the vehicle;

an inner housing located inside the outer housing and having an upper end and a lower end connected to the outer housing such that a cylindrical structure is formed;

a main vertical partition wall configured to partition an inner space formed by the outer housing and the inner housing in a width direction of the vehicle;

a main horizontal partition wall configured to partition the inner space formed by the outer housing and the inner housing in the width direction of the vehicle, and cross the main vertical partition wall; and

a floor panel fastening portion fastened to the center floor panel, and

wherein the floor panel fastening portion horizontally extends from the inner housing toward an inside of the vehicle, and the main horizontal partition wall is located at a position lower than the floor panel fastening portion.

2. The side sill assembly of claim 1 ,

wherein the center member, the front outer member, and the rear outer member are manufactured by extrusion.

3. The side sill assembly of claim 1 ,

wherein a connection portion is extended from the front end and rear end of the center member in a longitudinal direction of the center member, respectively, and configured to cover outsides of the front outer member and the rear outer member,

wherein a fastening member is configured to fasten the center member and the front outer member while penetrating and fastening the connection portion and the front outer member, and

wherein the fastening member is configured to fasten the center member and the rear outer member while penetrating and fastening the connection portion and the rear outer member.

4. The side sill assembly of claim 1 ,

wherein the center member includes an auxiliary vertical partition wall configured to partition a space between the outer housing and the main vertical partition wall.

5. The side sill assembly of claim 1 ,

wherein the center member includes an auxiliary horizontal partition wall that is configured to partition a space between the main horizontal partition wall and the inner housing and is located below the main horizontal partition wall.

6. The side sill assembly of claim 5 ,

wherein a high voltage battery is fastened to the center member by a fastening bolt penetrating a battery frame fastened to a side surface of the high voltage battery.

7. The side sill assembly of claim 6 ,

wherein the fastening bolt has a lower portion and an upper portion fixed to a bottom surface of the inner housing and the auxiliary horizontal partition wall, respectively, and is fastened to a fastener having a thread formed therein.

8. The side sill assembly of claim 1 ,

wherein a horizontal distance between the outer housing and the main vertical partition wall and a horizontal distance between the inner housing and the main vertical partition wall are formed to be same as each other.

9. The side sill assembly of claim 1 ,

wherein a horizontal distance between a battery frame fastened to a side surface of a high voltage battery and the inner housing is smaller than a horizontal distance between the inner housing and the main vertical partition wall.

10. The side sill assembly of claim 1 , further comprising: a front inner member located inside the front outer member and fastened to a front apron and a dash panel.

11. The side sill assembly of claim 10 ,

wherein in a portion adjacent to a front end of a battery frame fastened to a side surface of a high voltage battery, the high voltage battery is fastened to the front inner member by a fastening bolt penetrating the battery frame.

12. The side sill assembly of claim 10 ,

wherein in a portion in which the center member and the front inner member overlap each other, a high voltage battery is fastened to the front inner member and the center member by a fastening bolt penetrating a battery frame fastened to a side surface of the high voltage battery.

13. The side sill assembly of claim 1 ,

wherein a bottom surface of the center member includes at least one guide hole arranged in a longitudinal direction of the vehicle, and

a battery frame is fastened to the side surface of a high voltage battery and includes a guide pin inserted into the guide hole.

14. The side sill assembly of claim 1 , further comprising: a rear inner member that is located inside the rear outer member and fastened to a rear floor panel for the vehicle.

15. The side sill assembly of claim 14 ,

wherein in a portion adjacent to a rear end of a battery frame fastened to a side surface of a high voltage battery, the high voltage battery is fastened to the rear inner member by a fastening bolt penetrating the battery frame.

16. The side sill assembly of claim 14 ,

wherein in a portion in which the center member and the rear inner member overlap each other,

a high voltage battery is fastened to the rear inner member and the center member by a fastening bolt penetrating a battery frame fastened to a side surface of the high voltage battery and the rear inner member.

17. The side sill assembly of claim 1 ,

wherein the front outer member and the rear outer member have same cross sections.

18. The side sill assembly of claim 17 ,

wherein the front outer member comprises:

an outer housing formed on a widthwise outside of the vehicle;

an inner housing located inside the outer housing and having an upper end and a lower end connected to the outer housing such that a cylindrical structure is formed;

at least one main horizontal partition wall configured to vertically partition a space formed by the outer housing and the inner housing; and

a vertical partition wall configured to partition a space of the lower portion of the horizontal partition wall located on a lowermost end among the at least one partition wall in the width direction of the vehicle.