Straddle vehicle

1. A straddle vehicle comprising:

a driving electric motor configured to generate drive power to be transmitted to a drive wheel;

a seat on which a rider sits;

a battery pack disposed under the seat and storing electric power to be supplied to the driving electric motor; and

a vehicle body frame comprising a receiving base supporting the battery pack and a presser member pressing a top surface of the battery pack, wherein

the receiving base includes five surfaces supporting front, rear, left, right, and bottom surfaces of the battery pack, respectively,

the presser member includes a recessed portion projecting downward, a first mounting portion projecting forward from a front upper edge of the recessed portion, and a second mounting portion projecting rearward from a rear upper edge of the recessed portion, and

the first and second mounting portions are secured to the vehicle body frame or to another member secured to the vehicle body frame.

2. The straddle vehicle according to claim 1 , further comprising:

an auxiliary battery having a lower voltage than the battery pack; and

a DC-DC converter configured to reduce the voltage of electric power output from the battery pack and supply the resulting electric power to the auxiliary battery, wherein

the vehicle body frame comprises a main frame supporting the driving electric motor and a seat support frame extending obliquely upward and rearward from the main frame and supporting the seat, and

in side view, the driving electric motor, the battery pack, the DC-DC converter, and the auxiliary battery are arranged in a direction in which the seat support frame extends.

3. The straddle vehicle according to claim 1 , wherein a lower end of the battery pack is located below and forward of an upper end of a rear wheel serving as the drive wheel.

4. The straddle vehicle according to claim 1 , wherein

the battery pack comprises a battery cell, an electronic component electrically connected to the battery cell, a casing accommodating the battery cell and the electronic component, and a connector electrically connected to the battery cell and the electronic component,

the electronic component is disposed adjacent to the battery cell in a forward/rearward direction, and

the connector is mounted on an end portion of the casing in the forward/rearward direction.

5. The straddle vehicle according to claim 1 , wherein a rear lower edge of the battery pack is chamfered.

6. A straddle vehicle comprising:

a driving electric motor configured to generate drive power to be transmitted to a drive wheel;

a seat on which a rider sits;

a battery pack disposed under the seat and storing electric power to be supplied to the driving electric motor; and

a vehicle body frame comprising a receiving base supporting the battery pack, wherein

the receiving base includes five surfaces supporting front, rear, left, right, and bottom surfaces of the battery pack, respectively,

a side surface of the battery pack in a leftward/rightward direction is exposed when viewed from a left or right side of the straddle vehicle, and

the battery pack comprises a radiating fin member, and the side surface of the battery pack includes a surface of the radiating fin member.

7. A straddle vehicle comprising:

a driving electric motor configured to generate drive power to be transmitted to a drive wheel;

a seat on which a rider sits;

a battery pack disposed under the seat and storing electric power to be supplied to the driving electric motor;

a vehicle body frame comprising a receiving base supporting the battery pack; and

a rear fender facing the drive wheel, wherein

the receiving base includes five surfaces supporting front, rear, left, right, and bottom surfaces of the battery pack, respectively, and

a front portion of the rear fender covers the rear and bottom surfaces of the battery pack.