Battery cell of improved cooling efficiency

1. A battery module comprising two or more battery cells and a heat exchange member,

wherein each battery cell is configured to include:

a battery case;

two or more electrode assemblies disposed in the battery case, each electrode assembly having a cathode, an anode, and a separator interposed between the cathode and the anode; and

a heat dissipation member disposed at an interface between two adjacent electrode assemblies to dissipate heat generated in the adjacent electrode assemblies during charge and discharge of the battery cell or upon occurrence of a short circuit, the heat dissipation member being in contact with adjacent outer surfaces of the adjacent electrode assemblies and is not disposed within either of the adjacent electrode assemblies, and a portion of the heat dissipation member is exposed outward from the adjacent electrode assemblies,

wherein at least one side end of the heat dissipation member extends outward from the battery case, and the heat dissipation member protruding outward from the battery cell is in contact with the heat exchange member,

wherein the heat dissipation member is configured to have a plate-shaped structure, and

wherein the heat dissipation member has a higher thermal conductivity than the thermal conductivity of the battery case.

2. The battery module according to claim 1 , wherein each electrode assembly is configured to have a jelly-roll.

3. The battery module according to claim 1 , wherein each electrode assembly is configured to have a stacked type or stacked/folded type structure.

4. The battery module according to claim 1 , wherein the battery case is a cylindrical or prismatic case made of a metal material.

5. The battery module according to claim 1 , wherein the battery case is formed of a laminate sheet comprising a resin layer and a metal layer, and the laminate sheet is thermally welded in a state in which the at least one side end of the heat dissipation member is disposed in the laminate sheet.

6. The battery module according to claim 1 , wherein at least one side end of the heat dissipation member extends outward from a side of the battery case opposite to another side of the battery case at which electrode terminals are located or from a side of the battery case adjacent to another side of the battery case at which electrode terminals are located.

7. The battery module according to claim 1 , wherein the heat dissipation member is formed of a thermally conductive material.

8. The battery module according to claim 1 , wherein the heat dissipation member is formed of a metal material.

9. The battery module according to claim 1 , wherein the heat exchange member is provided with one or more flow channels through which a coolant flows.

10. The battery module according to claim 1 , wherein the heat exchange member is configured to have a structure comprising:

a base part in tight contact with the heat dissipation member;

opposite side parts connected to the base part, the opposite side parts having coolant flow channels formed therethrough in a longitudinal direction thereof; and

a plurality of heat dissipation fins disposed between the opposite side parts in a state in which the heat dissipation fins extend upward from the base part.

11. A battery pack comprising one or more battery modules according to claim 1 based on output and capacity.

12. A device comprising a battery pack according to claim 11 .

13. The device according to claim 12 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.

14. The battery module according to claim 1 , wherein the heat dissipation member consists of a metal material.

15. The battery module according to claim 1 , wherein the heat dissipation member is separate from the battery case.