Battery cell of improved cooling efficiency

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.