Vehicle-body structure of electric automotive vehicle

1. A vehicle-body structure of an electric automotive vehicle, in which a motor for vehicle driving is provided and a battery case where a battery to supply electric power to the motor for vehicle driving is stored is arranged below a floor panel, comprising:

a floor-side cross member attached to the floor panel and extending in a vehicle width direction along the floor panel;

a pair of right-and-left hollow-shaped side sills provided to extend in a vehicle longitudinal direction at both end portions, in the vehicle width direction, of the floor panel; and

a hollow-shaped side load-transmitting member provided inside each of the side sills, extending in the vehicle longitudinal direction, and transmitting a load applied to a vehicle-inward side from a vehicle-outward side toward the vehicle-inward side,

wherein a lower portion of said side sill is provided to overlap said battery case in a vehicle side view, and said side load-transmitting member comprises a first vertical wall portion provided to extend in a vertical direction and overlap said floor-side cross member in the vehicle side view and a second vertical wall portion provided to extend in the vertical direction and overlap said battery case in the vehicle side view;

wherein the side load-transmitting member comprises an upper wall portion, an outside wall portion, an inside upper vertical wall portion as the first vertical wall portion, an inside lower vertical wall portion as the second vertical wall portion, a middle wall portion, and a lower wall portion;

wherein the upper wall portion extends in the vehicle width direction, the outside wall portion extends downward from an outer end portion of the upper wall portion, and the inside upper vertical wall portion extends downward from an inner end portion of the upper wall portion; and

wherein the middle wall portion extends outward, in the vehicle width direction, from a lower end portion of the inside upper vertical wall portion, the inside lower vertical wall portion extends downward from an inner end portion of the middle wall portion, and the lower wall portion extends from a lower end portion of the inside lower vertical wall portion to a lower end portion of the outside wall portion to form an outward extending step between the middle wall portion and the lower wall portion which overlaps the battery case in the vehicle side view.

2. The vehicle-body structure of the electric automotive vehicle of claim 1 , wherein a first rib is formed inside said side load-transmitting member, the first rib being configured to extend in the vehicle width direction and such that an inner end portion, in the vehicle width direction, thereof is connected to said first vertical wall portion.

3. The vehicle-body structure of the electric automotive vehicle of claim 2 , wherein a second rib is formed inside said side load-transmitting member, the second rib being configured to extend in the vehicle width direction and such that an inner end portion, in the vehicle width direction, thereof is connected to said second vertical wall portion.

4. The vehicle-body structure of the electric automotive vehicle of claim 3 , wherein said battery case is fixed to said side load-transmitting member.

5. The vehicle-body structure of the electric automotive vehicle of claim 4 , wherein said first vertical wall portion and an upper portion of said battery case overlap each other in the vehicle side view.

6. The vehicle-body structure of the electric automotive vehicle of claim 5 , wherein a first recess portion which is recessed outward, in the vehicle width direction, is provided to extend in the vehicle longitudinal direction at a lower portion of an inside, in the vehicle width direction, of said side sill, a second recess portion which is recessed so as to correspond to said first recess portion is formed at a lower portion of a cabin-inside of said side load-transmitting member, and an outward side, in the vehicle width direction, of said battery case is configured to be fitted into said first recess portion.

7. The vehicle-body structure of the electric automotive vehicle of claim 1 , wherein a second rib is formed inside said side load-transmitting member, the second rib being configured to extend in the vehicle width direction and such that an inner end portion, in the vehicle width direction, thereof is connected to said second vertical wall portion.

8. The vehicle-body structure of the electric automotive vehicle of claim 1 , wherein said battery case is fixed to said side load-transmitting member.

9. The vehicle-body structure of the electric automotive vehicle of claim 1 , wherein said first vertical wall portion and an upper portion of said battery case overlap each other in the vehicle side view.

10. The vehicle-body structure of the electric automotive vehicle of claim 1 , wherein a first recess portion which is recessed outward, in the vehicle width direction, is provided to extend in the vehicle longitudinal direction at a lower portion of an inside, in the vehicle width direction, of said side sill, a second recess portion which is recessed so as to correspond to said first recess portion is formed at a lower portion of a cabin-inside of said side load-transmitting member, and an outward side, in the vehicle width direction, of said battery case is configured to be fitted into said first recess portion.

11. The vehicle-body structure of the electric automotive vehicle of claim 2 , wherein said battery case is fixed to said side load-transmitting member.

12. The vehicle-body structure of the electric automotive vehicle of claim 2 , wherein said first vertical wall portion and an upper portion of said battery case overlap each other in the vehicle side view.

13. The vehicle-body structure of the electric automotive vehicle of claim 2 , wherein a first recess portion which is recessed outward, in the vehicle width direction, is provided to extend in the vehicle longitudinal direction at a lower portion of an inside, in the vehicle width direction, of said side sill, a second recess portion which is recessed so as to correspond to said first recess portion is formed at a lower portion of a cabin-inside of said side load-transmitting member, and an outward side, in the vehicle width direction, of said battery case is configured to be fitted into said first recess portion.

14. The vehicle-body structure of the electric automotive vehicle of claim 3 , wherein said first vertical wall portion and an upper portion of said battery case overlap each other in the vehicle side view.

15. The vehicle-body structure of the electric automotive vehicle of claim 3 , wherein a first recess portion which is recessed outward, in the vehicle width direction, is provided to extend in the vehicle longitudinal direction at a lower portion of an inside, in the vehicle width direction, of said side sill, a second recess portion which is recessed so as to correspond to said first recess portion is formed at a lower portion of a cabin-inside of said side load-transmitting member, and an outward side, in the vehicle width direction, of said battery case is configured to be fitted into said first recess portion.

16. The vehicle-body structure of the electric automotive vehicle of claim 4 , wherein a first recess portion which is recessed outward, in the vehicle width direction, is provided to extend in the vehicle longitudinal direction at a lower portion of an inside, in the vehicle width direction, of said side sill, a second recess portion which is recessed so as to correspond to said first recess portion is formed at a lower portion of a cabin-inside of said side load-transmitting member, and an outward side, in the vehicle width direction, of said battery case is configured to be fitted into said first recess portion.

17. The vehicle-body structure of the electric automotive vehicle of claim 7 , wherein said battery case is fixed to said side load-transmitting member.

18. The vehicle-body structure of the electric automotive vehicle of claim 8 , wherein said first vertical wall portion and an upper portion of said battery case overlap each other in the vehicle side view.

19. The vehicle-body structure of the electric automotive vehicle of claim 9 , wherein a first recess portion which is recessed outward, in the vehicle width direction, is provided to extend in the vehicle longitudinal direction at a lower portion of an inside, in the vehicle width direction, of said side sill, a second recess portion which is recessed so as to correspond to said first recess portion is formed at a lower portion of a cabin-inside of said side load-transmitting member, and an outward side, in the vehicle width direction, of said battery case is configured to be fitted into said first recess portion.

20. The vehicle-body structure of the electric automotive vehicle of claim 11 , wherein said first vertical wall portion and an upper portion of said battery case overlap each other in the vehicle side view.

21. The vehicle-body structure of the electric automotive vehicle of claim 1 , further comprising a first battery-side cross member, a second battery-side cross member, and a third battery-side cross member inside the battery case and extending in the vehicle width direction as reinforcing members.