Battery case for electric vehicle

1. A battery case for an electric vehicle for containing therein battery modules, comprising:

a tray member for supporting the battery modules;

a cover member to be put on top of the tray member, and fixed to the tray member,

the tray member including a resin section constituted of a peripheral wall and bottom wall formed of a resin, an insert structure including at least one insert member embedded in the peripheral wall, and a seal member applied to a joint part between the tray member and cover member, and

the insert member including an embedded bolt arranged in the peripheral wall in such a manner that a threaded part thereof protrudes from the joint part of the tray member, and embedded nuts arranged in the peripheral wall of the tray member at positions different from the embedded bolt;

the battery case further comprising:

first fastening sections each of which is formed by screwing a nut member onto the embedded bolt, and fastening the nut member in a state where the cover member is put on top of the tray member; and

second fastening sections each of which is formed by screwing a bolt member into the embedded nut, and fastening the bolt member in the state where the cover member is put on top of the tray member, wherein

a first collar made of metal is arranged in a hole of a peripheral edge part of the cover member into which the embedded bolt is inserted, the first collar is interposed between the insert member and the nut member, a second collar is arranged in a hole of the peripheral edge part of the cover member into which the bolt member is inserted, and the second collar is interposed between the insert member and a head section of the bolt member.

2. The battery case for an electric vehicle according to claim 1 , wherein

the seal member to be applied to the joint part between the tray member and cover member is applied to a peripheral edge part of the joint part.

3. The battery case for an electric vehicle according to claim 1 , further comprising:

beam members arranged on the undersurface side of the tray member, and extending in the width direction of the vehicle body;

embedded horizontal nuts fixed to the insert members, and extending in the horizontal direction; and

bolts to be screwed into the embedded horizontal nuts, for fixing the tray member to the beam members, wherein

both end parts of the beam members are fixed to a pair of side members of the vehicle body from the undersurface side of the vehicle body by means of bolts.

4. The battery case for an electric vehicle according to claim 1 , wherein

each of the insert members is provided with only one embedded bolt.

5. The battery case for an electric vehicle according to claim 1 , wherein

the cover member has a flange portion formed around a peripheral edge part thereof that opposes the joint part of the tray member, and

the seal member seals between the flange portion and the joint part.

6. The battery case for an electric vehicle according to claim 2 , further comprising:

beam members arranged on the undersurface side of the tray member, and extending in the width direction of the vehicle body;

embedded horizontal nuts fixed to the insert members, and extending in the horizontal direction; and

bolts to be screwed into the embedded horizontal nuts, for fixing the tray member to the beam members, wherein

both end parts of the beam members are fixed to a pair of side members of the vehicle body from the undersurface side of the vehicle body by means of bolts.

7. The battery case for an electric vehicle according to claim 2 , wherein

each of the insert members is provided with only one embedded bolt.

8. The battery case for an electric vehicle according to claim 2 , wherein

the cover member has a flange portion formed around a peripheral edge part thereof that opposes the joint part of the tray member, and

the seal member seals between the flange portion and the joint part.