BATTERY MODULE WITH IMPROVED SAFETY, BATTERY PACK INCLUDING THE BATTERY MODULE AND VEHICLE INCLUDING THE BATTERY PACK

Provided are a battery module with improved safety by blocking current when the temperature rises, a battery pack including the battery module, and a vehicle including the battery pack. The battery module includes two or more battery cells, wherein the two or more battery cells has a structure in which an electrode assembly having both ends respectively connected to one ends of electrode leads of opposite polarities is accommodated and sealed in a pouch case together with an electrolyte and other ends of the electrode leads are exposed to an outside of the pouch case, wherein the electrode leads and a bus bar are connected in electrically connecting a first battery cell and a second battery cell of the two or more battery cells, wherein the bus bar comprises a metal layer and a material layer that is normally conductive but may act as a resistor when a temperature rises, and wherein the material layer comprises a gas generating material that is decomposed at a certain temperature or higher to generate a gas and increase resistance.