Vehicle front portion structure

1. A vehicle front portion structure comprising:

a battery case that is installed beneath a floor of a vehicle;

front side members that extend in a vehicle longitudinal direction further toward a vehicle front side than the battery case;

side rails that structure portions of a suspension member that is disposed further toward the vehicle front side than the battery case, and that extend in the vehicle longitudinal direction;

first connecting members that connect the battery case and the front side members; and

second connecting members each having a truss shape, that connect a vehicle longitudinal direction front end portion of the battery case and vehicle longitudinal direction rear ends of the side rails, that face the battery case in the vehicle longitudinal direction as seen in a plan view and in a side view, and that face the side rails in the vehicle longitudinal direction as seen in a plan view and in a side view.

2. The vehicle front portion structure of claim 1 , wherein vehicle longitudinal direction rear ends of the front side members and the vehicle longitudinal direction rear ends of the side rails are offset in a vehicle transverse direction.

3. The vehicle front portion structure of claim 1 , wherein vehicle longitudinal direction front end portions of the second connecting members each have a pair of supporting portions that extend toward a vehicle front side, and rear end portions of the side rails are supported by the supporting portions.

4. The vehicle front portion structure of claim 3 , wherein the supporting portions support vehicle transverse direction side surfaces of the side rails, and the side rails and the supporting portions are fastened by fastening members that are inserted from vehicle transverse direction outer sides.

5. The vehicle front portion structure of claim 3 , wherein each of the second connecting members includes:

a pair of transmitting portions that extend in the vehicle longitudinal direction from respective rear ends of the pair of supporting portions;

a rear wall portion that connects rear ends of the pair of transmitting portions in a vehicle transverse direction;

a first rib that connects the pair of transmitting portions at a vehicle longitudinal direction front side of the rear wall portion;

a second rib that connects the rear wall portion and a first joining portion that joins the first rib and one transmitting portion of the pair of transmitting portions; and

a third rib that connects a rear end of the second rib and a second joining portion that joins the first rib and another transmitting portion of the pair of transmitting portions,

wherein a third joining portion, which joins the second rib and the third rib, overlaps with a rear end of a corresponding side rail in a vehicle vertical direction.

6. The vehicle front portion structure of claim 5 , wherein the battery case includes corner portions at a vehicle longitudinal direction front end portion as seen in a vehicle plan view, and each third joining portion faces a corresponding corner portion in the vehicle longitudinal direction.

7. The vehicle front portion structure of any one of claim 1 , wherein heights of centroids of the side rails in a vehicle vertical direction coincide with a height of a centroid of the battery case in the vehicle vertical direction.

8. A vehicle front portion structure comprising:

a battery case that is installed beneath a floor of a vehicle;

front side members that extend in a vehicle longitudinal direction further toward a vehicle front side than the battery case;

side rails that structure portions of a suspension member that is disposed further toward the vehicle front side than the battery case, and that extend in the vehicle longitudinal direction;

first connecting members that connect the battery case and the front side members; and

second connecting members that connect a vehicle longitudinal direction front end portion of the battery case and vehicle longitudinal direction rear ends of the side rails, that face the battery case in the vehicle longitudinal direction as seen in a plan view and in a side view, and that face the side rails in the vehicle longitudinal direction as seen in a plan view and in a side view,

wherein vehicle longitudinal direction front end portions of the second connecting members each have a pair of supporting portions that extend toward a vehicle front side, and rear end portions of the side rails are supported by the supporting portions,

wherein each of the second connecting members includes:

a pair of transmitting portions that extend in the vehicle longitudinal direction from respective rear ends of the pair of supporting portions;

a rear wall portion that connects rear ends of the pair of transmitting portions in a vehicle transverse direction;

a first rib that connects the pair of transmitting portions at a vehicle longitudinal direction front side of the rear wall portion;

a second rib that connects the rear wall portion and a first joining portion that joins the first rib and one transmitting portion of the pair of transmitting portions; and

a third rib that connects a rear end of the second rib and a second joining portion that joins the first rib and another transmitting portion of the pair of transmitting portions,

wherein a third joining portion, which joins the second rib and the third rib, overlaps with a rear end of a corresponding side rail in a vehicle vertical direction.

9. A vehicle front portion structure comprising:

a battery case that is installed beneath a floor of a vehicle;

front side members that extend in a vehicle longitudinal direction further toward a vehicle front side than the battery case;

side rails that structure portions of a suspension member that is disposed further toward the vehicle front side than the battery case, and that extend in the vehicle longitudinal direction;

first connecting members that connect the battery case and the front side members; and

second connecting members that connect a vehicle longitudinal direction front end portion of the battery case and vehicle longitudinal direction rear ends of the side rails, that face the battery case in the vehicle longitudinal direction as seen in a plan view and in a side view, and that face the side rails in the vehicle longitudinal direction as seen in a plan view and in a side view,

wherein heights of centroids of the side rails in a vehicle vertical direction coincide with a height of a centroid of the battery case in the vehicle vertical direction.