Battery housing formed with cooling passages and battery pack having the same

1. A battery pack comprising:

a housing having a plurality of inner side walls and a plurality of inner bottom walls defining a plurality of coupling recesses, the inner side walls being integrally provided with the inner bottom walls, the housing further having a peripheral portion around the coupling recesses, and a plurality of cooling passages extending in at least one direction within the peripheral portion;

a plurality of battery cells housed in the coupling recesses; and

a heat screen on the housing, the heat screen having a substantially planar surface covering a first array of the plurality of cooling passages, a plurality of first openings each exposing a corresponding one of the coupling recesses, and a plurality of second openings each exposing a second array of the plurality of cooling passages,

wherein each of the first openings is independently surrounded by corresponding ones of the second openings.

2. The battery pack of claim 1 , the housing further having at least one outer side wall and a bottom surface,

wherein the inner side walls and the at least one outer side wall define the peripheral portion.

3. The battery pack of claim 2 , wherein the housing further has a top surface and wherein the at least one direction is a direction normal to the top surface and to the bottom surface.

4. The battery pack of claim 2 , wherein the housing further has a top surface and wherein the plurality of cooling passages extend from the top surface to the bottom surface.

5. The battery pack of claim 1 , further comprising an insulating layer on the inner side walls and the inner bottom walls of the battery housing.

6. The battery pack of claim 1 , wherein each of the battery cells is surrounded by the inner side walls integrally provided with the inner bottom walls.

7. A battery pack comprising:

a battery assembly comprising:

an electrode assembly;

a current collector plate electrically coupled to the electrode assembly; and

a cap plate on the electrode assembly;

a housing having a plurality of inner side walls and a plurality of inner bottom walls defining a plurality of coupling recesses, the inner side walls being integrally provided with the inner bottom walls, and at least one of the coupling recesses housing the battery assembly and an electrolyte, a peripheral portion around the coupling recesses, and a plurality of cooling passages extending in at least one direction within the peripheral portion; and

a heat screen on the housing, the heat screen having a substantially planar surface covering a first array of the plurality of cooling passages, a plurality of first openings each exposing a corresponding one of the coupling recesses, and a plurality of second openings each exposing a second array of the plurality of cooling passages,

wherein each of the first openings is independently surrounded by corresponding ones of the second openings.

8. The battery pack of claim 7 , wherein an area of the cap plate is not less than an area of an opening of at least one of the coupling recesses.

9. The battery pack of claim 7 , wherein the cap plate is welded to the housing.

10. The battery pack of claim 7 , wherein the cap plate is substantially flush with the heat screen.

11. The battery pack of claim 7 , further comprising an insulating layer on the inner side walls and the inner bottom walls of the housing.

12. The battery pack of claim 7 , wherein the housing comprises aluminum, copper, iron, stainless steel, a ceramic or a polymer.

13. The battery pack of claim 7 , wherein the plurality of cooling passages are evenly spaced from each other.

14. The battery pack of claim 7 , the housing further having at least one outer side wall and a bottom surface,

wherein the inner side walls and the at least one outer side wall define the peripheral portion.

15. A battery pack comprising:

a plurality of battery assemblies, each of the battery assemblies comprising:

an electrode assembly;

a current collector plate electrically coupled to the electrode assembly; and

a cap plate on the electrode assembly;

a plurality of coupling recesses, each of the plurality of coupling recesses housing a corresponding one of the plurality of battery assemblies and an electrolyte;

a battery housing having a plurality of inner side walls and a plurality of inner bottom walls defining the coupling recesses, the inner side walls being integrally provided with the inner bottom walls, and having a plurality of cooling passages extending in at least one direction within a peripheral portion of the battery housing, the peripheral portion being around each of coupling recesses; and

a heat screen, wherein the peripheral portion of the battery housing comprises a first peripheral portion and a second peripheral portion, and wherein the heat screen has a plurality of openings exposing a larger number of the plurality of cooling passages in the first peripheral portion than in the second peripheral portion, wherein each of the coupling recesses is independently surrounded by corresponding ones of the openings.

16. The battery pack of claim 15 , further comprising an insulating layer on the inner side walls and the inner bottom walls of the battery housing.

17. The battery pack of claim 15 , the battery housing further having at least one outer side wall and a bottom surface,

wherein the inner side walls and the at least one outer side wall define the peripheral portion.