Rechargeable battery module

1. A rechargeable battery module comprising a plurality of unit batteries, the unit batteries comprising:

an electrode assembly comprising a first electrode, a second electrode, and a separator between the first and second electrodes;

a case having a polygonal column shape for accommodating the electrode assembly;

first and second plates respectively sealing openings formed at opposite sides of the case,

wherein a surface of the case of a unit battery of the unit batteries contacts a neighboring unit battery of the unit batteries;

cooling parts positioned within a groove in the case of the unit battery, the groove extending parallel to a length direction of the unit battery, and the cooling parts being configured to contact neighboring unit batteries within a groove in the case of the neighboring unit batteries and to cool the unit battery, wherein the cooling parts are separated from each other; and

a cooling plate being fluidly connected to the cooling parts at a first end of the cooling parts,

wherein one or more of the cooling parts contact a plurality of adjacent unit batteries from among the plurality of unit batteries and each of the cooling parts comprises a first fluid conduit inside a second fluid conduit, and a rotating part at a second end of the cooling parts opposite the first end of the cooling parts where the cooling plate is connected to the cooling parts, wherein one of the first fluid conduit or the second fluid conduit is an inflow conduit and another of the first fluid conduit or the second fluid conduit is an outflow conduit, and the inflow conduit is fluidly connected to the outflow conduit through the rotating part.

2. The rechargeable battery module of claim 1 , wherein the unit battery comprises groove portions extending parallel to the length direction of the unit battery, at edges of the surface of the case in a width direction thereof that contacts the neighboring unit battery.

3. The rechargeable battery module of claim 2 , wherein a groove portion of the groove portions comprises a cooling part from among the cooling parts extending parallel to the length direction of the unit battery.

4. The rechargeable battery module of claim 3 , wherein one end of the cooling part is connected to a cooling plate under a bottom surface of the second plate via an insulating plate in the unit battery.

5. The rechargeable battery module of claim 4 , wherein the cooling plate comprises a multi-layered hole into which the cooling part is inserted.

6. The rechargeable battery module of claim 5 , wherein the cooling plate has a multi-layered structure comprising an inflow layer to which the inflow conduit is connected and an outflow layer to which the outflow conduit is connected.

7. The rechargeable battery module of claim 3 , wherein the cooling part in a direction perpendicular to a length direction thereof has at least one of circular, oval, triangular, quadrangular, and polygonal cross-sectional shapes.

8. The rechargeable battery module of claim 3 , wherein the inflow conduit and the outflow conduit each comprise multiple tubes extending in the length direction.

9. The rechargeable battery module of claim 8 , wherein the inflow conduit, the outflow conduit, and the rotating part are configured to circulate a cooling fluid.

10. The rechargeable battery module of claim 1 , wherein the first plate includes an electrode terminal electrically coupled to the first electrode of the electrode assembly and penetrating the first plate to protrude out of the first plate.

11. The rechargeable battery module of claim 1 , wherein the second plate is electrically coupled to the second electrode of the electrode assembly.

12. The rechargeable battery module of claim 1 , wherein the electrode assembly is formed in a jelly-roll shape in which the first electrode, the second electrode, and the separator are wound.