Battery pack having function of preventing inflow of leaking coolant

1. A battery pack having a function of preventing an inflow of a leaking coolant, the battery pack comprising:

a housing, the housing having a bottom wall;

at least one battery cell or battery module mounted in a first space in the housing;

a heat exchanger provided in the housing for cooling the battery cell or the battery module, the heat exchanger being spaced above the bottom wall of the housing and having at least one port;

a seal provided between the heat exchanger and an inner surface of the housing for preventing a coolant leaking from the heat exchanger from flowing into the first space of the housing;

at least one port hole in the bottom wall of the housing, the at least one port extending through the at least one port hole; and

at least one discharge opening formed around the at least one port hole,

wherein the at least one port hole has an edge, and

wherein the at least one discharge opening is a notch in the edge of the at least one port hole.

2. The battery pack according to claim 1 , wherein the housing is provided with a channel having a recessed structure,

wherein a gasket is mounted in the channel to form the seal.

3. The battery pack according to claim 1 , wherein the housing is provided with a stepped surface,

wherein a gasket is mounted to the stepped surface to form the seal.

4. The battery pack according to claim 1 , wherein the housing is provided with a discharge channel,

wherein the discharge channel is connected to the at least one discharge opening.

5. The battery pack according to claim 1 , wherein the heat exchanger comprises:

a coolant introduction port, through which the coolant is introduced; and

a coolant discharge port, through which the coolant is discharged,

wherein the at least one port holes comprises two port holes, the coolant introduction port and the coolant discharge port extending through the port holes, and

wherein the at least one discharge opening is two discharge openings respectively formed around of the port holes.

6. The battery pack according to claim 1 , wherein the heat exchanger comprises plural plates joined to each other to define a space between the plural plates, through which the coolant flows, and

wherein the seal isolates a joint between one of the plural plates and the inner surface of the housing.

7. The battery pack according to claim 1 , wherein the heat exchanger comprises:

a first plate located adjacent to the battery cell or the battery module; and

a second plate located adjacent to a bottom surface or a wall surface of the housing,

wherein edges of the first plate and the second plate are joined to each other to define a space, through which the coolant flows, between the first plate and the second plate, and

wherein a gasket is mounted between the first plate and the inner surface of the housing.

8. The battery pack according to claim 7 , wherein the first plate is provided at an edge thereof with a skirt, which is bent from the edge of the first plate, and

wherein the housing is provided with a gasket, to which the skirt is coupled.

9. The battery pack according to claim 2 , wherein the heat exchanger is provided at an edge thereof with a skirt, and

wherein the gasket is located between the skirt and the channel in the housing.

10. The battery pack according to claim 1 , wherein the bottom wall of the housing has an inclined surface, which extends to the discharge opening.

11. The battery pack according to claim 10 , further comprising a protruding support rib for supporting the heat exchanger on the inclined surface.

12. The battery pack according to claim 1 , wherein the heat exchanger is mounted on a wall surface of the housing and is disposed vertically.

13. The battery pack according to claim 2 , wherein the gasket comprises a bonding material for bonding an edge of the heat exchanger to the inner surface of the housing.

14. The battery pack according to claim 2 , wherein the gasket is a ring-shaped packing member, the packing member being mounted between the housing and the heat exchanger.