Vehicle body lower structure

1. A vehicle body lower structure, comprising:

a battery case that is disposed below a floor panel of a vehicle body and accommodates a battery;

a side sill that is disposed below a side portion of the vehicle body in a vehicle body forward-rearward direction; and

a case-mounting frame that couples the side sill and the battery case to each other and causes the battery case to be supported by the side sill,

wherein the case-mounting frame has

a frame main body portion which is disposed on an outward side of the battery case in a vehicle width direction, and

a battery case reception flange which extends to an inward side in the vehicle width direction from the frame main body portion and is joined to a lower surface of a bottom wall of the battery case,

wherein a battery support frame extending in the vehicle body forward-rearward direction and supporting the battery is joined to an upper surface of the bottom wall of the battery case,

wherein a recessed portion protruding downward is provided between a joint portion with respect to the battery case reception flange and a joint portion with respect to the battery support frame in the bottom wall of the battery case, and

wherein the recessed portion is located at a further outer position in the vehicle width direction than an outer end of the battery in the vehicle width direction.

2. The vehicle body lower structure according to claim 1 ,

wherein the recessed portion has

an outwardly inclined wall which inclines downward toward the inward side in the vehicle width direction from a side of the joint portion with respect to the battery case reception flange,

an inwardly inclined wall which inclines downward toward the outward side in the vehicle width direction from a side of the joint portion with respect to the battery support frame, and

a coupling wall which couples lower ends of the outwardly inclined wall and the inwardly inclined wall to each other in a substantially horizontal manner.

3. The vehicle body lower structure according to claim 1 ,

wherein the recessed portion extends in a groove shape in the vehicle body forward-rearward direction in the bottom wall of the battery case.

4. The vehicle body lower structure according to claim 1 ,

wherein a plurality of batteries each having a rectangular parallelepiped shape are disposed side by side in a vehicle forward-rearward direction and the vehicle width direction in the battery case while having a longitudinal direction thereof extending in the vehicle forward-rearward direction.

5. The vehicle body lower structure according to claim 1 ,

wherein the case-mounting frame includes

the frame main body portion which has a substantially L-shaped cross section having a horizontal portion joined to a lower surface of the side sill and an upright standing portion standing upright from the inward side of the horizontal portion in the vehicle width direction, and

the battery case reception flange which extends to the inward side in the vehicle width direction from a lower end of the frame main body portion, and

wherein a plurality of hollow cells partitioned by a partition wall are provided in the frame main body portion.

6. The vehicle body lower structure according to claim 1 ,

wherein a floor cross member extending substantially in the vehicle width direction is joined to an upper surface of the floor panel positioned above the battery case,

wherein in the floor cross member, a height of an end edge on the outward side in the vehicle width direction gradually decreases toward a terminal portion, and the terminal portion is joined to an upper surface of the side sill, and

wherein an inclined member obliquely coupling a lower surface of the floor panel to an inward side surface of the side sill facing the inward side in the vehicle width direction is disposed at a position below the end edge of the floor cross member on the lower surface of the floor panel.

7. The vehicle body lower structure according to claim 1 ,

wherein the case-mounting frame is an extruded aluminum member.

8. The vehicle body lower structure according to claim 3 ,

wherein at least the bottom wall of the battery case and a peripheral wall surrounding the bottom wall are constituted of an integrally pressed article.

9. The vehicle body lower structure according to claim 1 ,

wherein the battery is constituted of a plurality of battery cells stacked in a longitudinal direction,

wherein a plurality of batteries are disposed side by side in the vehicle width direction in the battery case while having a longitudinal direction thereof extending in a vehicle forward-rearward direction, and

wherein a battery accessory is disposed in an upper portion of the plurality of batteries arranged in the vehicle width direction at a center in the vehicle width direction.

10. The vehicle body lower structure according to claim 1 ,

wherein a plurality of batteries each having a rectangular parallelepiped shape are disposed side by side in a vehicle forward-rearward direction and the vehicle width direction in the battery case while having a longitudinal direction thereof extending in the vehicle forward-rearward direction,

wherein an electric wiring connected to the battery is disposed at a boundary portion between the front and rear batteries which are arranged in the vehicle forward-rearward direction,

wherein a plurality of floor cross members extending in the vehicle width direction are joined to an upper surface of the floor panel, and

wherein at least one of the floor cross members is disposed at each of front and rear positions in the vehicle with the boundary portion sandwiched therebetween.

11. The vehicle body lower structure according to claim 1 ,

wherein an outer end of the battery support frame is located at a further outer position in the vehicle width direction than the battery.

12. The vehicle body lower structure according to claim 1 ,

wherein the recessed portion is formed at both sides in the vehicle width direction, and the bottom wall of the battery case between the recessed portions is flat.