Battery pack for a vehicle

1. A battery pack for a vehicle, comprising:

a sealed inner case accommodating a battery module and spaced apart from the battery module;

an open external case surrounding the inner case and spaced apart from the inner case, the open external case including a first opening part having an open side and a second opening part having another open side, the open sides being open to external air;

a first foreign material blocking plate disposed at the first opening part of the external case, the first foreign material blocking plate including a plurality of holes for preventing foreign materials in the external air from flowing into the first opening part;

a second foreign material blocking plate disposed at the second opening part of the external case, the second foreign material blocking plate overlapping at least a portion of the second opening part and including at least one hole;

an air flow channel between an external surface of the inner case and an inner surface of the external case, the air flow channel connecting the first opening part and the second opening part such that the external air can flow between the first opening part and the second opening part; and

a radiator in the air flow channel, wherein:

the sealed inner case is sealed to prevent the external air from directly contacting the battery module,

the first opening part and the second opening part are facing each other,

the second opening part is disposed at a rear of the external case with respect to a flow direction of the external air through the battery pack,

the plurality of holes include main holes disposed adjacent to all edge portions of the first foreign material blocking plate adjacent to the air flow channel, and at least one sub hole disposed at a middle portion of the first foreign material blocking plate, wherein a diameter of each main hole is greater than a diameter of the at least one sub hole,

the at least one hole is disposed at a middle portion of the second foreign material blocking plate adjacent to a center portion of a rear of the sealed inner case,

the radiator contacts the inner case and does not contact the external case, the radiator including a plurality of heat sink pins,

the main holes of the first foreign material blocking plate overlap the heat sink pins, and the at least one hole of the second foreign material blocking plate overlaps the rear of the sealed inner case, and

the external case is supported by a spacer on the inner case, the spacer being formed of a vibration absorbing material.

2. The battery pack as claimed in a claim 1 , wherein the inner case is formed of a metal material.

3. The battery pack as claimed in claim 1 , wherein the radiator includes

a heat sink plate on the external surface of the inner case; and

the heat sink pins are on the heat sink plate, the heat sink pins extending parallel to the flow direction of the external air.

4. The battery pack as claimed in claim 1 , wherein the spacer is formed of a rubber material having a low thermal conductivity and being capable of absorbing vibration.

5. The battery pack as claimed in claim 1 , wherein the inner case further includes a battery management system electrically connected to the battery module, the battery management system:

being configured to manage the battery module, and

being disposed forward of the battery module with respect to the flow direction of the external air through the battery pack.

6. The battery pack as claimed in claim 5 , wherein the inner case further includes a relay assembly electrically connected to the battery module, the relay assembly:

being configured to cut off a current flow,

being disposed forward of the battery module with respect to the flow direction of the external air through the battery pack, and

being positioned parallel to the battery management system.

7. The battery pack as claimed in claim 1 , wherein the first opening part is disposed at a front of the external case with respect to the flow direction of the external air through the battery pack.

8. The battery pack as claimed in claim 1 , wherein a diameter of the at least one hole in the second foreign material blocking plate is greater than the diameter of each main hole in the first foreign material blocking plate.

9. The battery pack as claimed in claim 1 , wherein the external case is mounted on an exterior of the vehicle.