Straddle electric vehicle

1. A straddle electric vehicle which drives by a driving power generated by an electric motor, the straddle electric vehicle comprising:

a battery case accommodating a battery which is an electric power supply for the electric motor;

an inverter which converts DC power stored in the battery into AC power and supplies the AC power to the electric motor;

an air passage through which ram air is guided to an interior of the battery case and discharges air from the battery case;

a radiator for cooling a coolant used to cool the inverter or the electric motor using water or oil; and

an air box which is attached to an upper portion of the battery case and constitutes a portion of the air passage,

wherein an upper portion of the air box is openable and closable; and

wherein the radiator is placed inside the air box.

2. The straddle electric vehicle according to claim 1 ,

wherein the radiator is placed upstream of the battery case within the air passage.

3. The straddle electric vehicle according to claim 1 ,

wherein the radiator is placed downstream of the battery case within the air passage.

4. A straddle electric vehicle which drives by a driving power generated by an electric motor; the straddle electric vehicle comprising:

a battery case accommodating a battery which is an electric power supply for the electric motor;

an inverter which converts DC power stored in the battery into AC power and supplies the AC power to the electric motor;

an air passage through which ram air is guided to an interior of the battery case and discharges air from the battery case; and

a radiator for cooling a coolant used to cool the inverter or the electric motor using water or oil,

wherein the air passage has an extended section which is extended downward;

wherein the radiator is placed in the extended section; and

wherein the extended section is provided with a drain hole at a lower end of the extended section.

5. A straddle electric vehicle which drives by a driving power generated by an electric motor, the straddle electric vehicle comprising:

a battery case accommodating a battery which is an electric power supply for the electric motor;

an inverter which converts DC power stored in the battery into AC power and supplies the AC power to the electric motor;

an air passage through which ram air is guided to an interior of the battery case and discharges air from the battery case; and

a radiator for cooling a coolant used to cool the inverter or the electric motor using water or oil,

wherein the radiator is placed upstream of the battery case in a flow direction of the air for cooling the battery case;

wherein the air passage includes an inner space of an air box, a passage section used to deliver the air from an interior of the air box to the interior of the battery case, and a bypass passage which communicates the inner space of the air box to a region downstream of the battery case by bypassing an inner space of the battery case;

wherein an electric component is accommodated in the inner space of the air box; and

wherein the ram air which has flowed through the radiator forms an air flow moving toward the passage section to cool the battery and an air flow moving toward the bypass passage to cool the electric component, in the interior of the air box.

6. The straddle electric vehicle according to claim 5 ,

wherein the electric component is placed above the battery.

7. The straddle electric vehicle according to claim 5 ,

wherein the radiator separates a moisture from the ram air flowing toward the battery case.