A vehicle battery pack comprising: a first battery module ; a second battery module that is arranged in alignment with the first battery module in a specified arrangement direction (X); a first cooling pipe configured to cool the first battery module when being supplied with a refrigerant; a second cooling pipe configured to cool the second battery module when being supplied with the refrigerant; and a flow divider configured to divide and supply the refrigerant to the first cooling pipe and the second cooling pipe , wherein the flow divider is arranged between the first battery module and the second battery module in the arrangement direction (X), characterized in that the first battery module and the second battery module constitute a single-stage battery module group in which the battery modules are disposed in a single stage in a vehicle vertical direction (Z), a multi-stage battery module group in which battery modules (23a to 23d) are disposed in plural stages in the vehicle vertical direction (Z) is further provided in addition to the single-stage battery module group , the single-stage battery module group and the multi-stage battery module group are arranged, particularly adjacent to each other, in a different direction (Y) from the arrangement direction (X), the flow divider is arranged between the first battery module and the second battery module in the single-stage battery module group , the flow divider is arranged in a manner to overlap the single-stage battery module group when seen in the arrangement direction (X), and the arrangement direction (X) is a vehicle width direction. a first battery module ; a second battery module that is arranged in alignment with the first battery module in a specified arrangement direction (X); a first cooling pipe configured to cool the first battery module when being supplied with a refrigerant; a second cooling pipe configured to cool the second battery module when being supplied with the refrigerant; and a flow divider configured to divide and supply the refrigerant to the first cooling pipe and the second cooling pipe , wherein the flow divider is arranged between the first battery module and the second battery module in the arrangement direction (X), characterized in that the first battery module and the second battery module constitute a single-stage battery module group in which the battery modules are disposed in a single stage in a vehicle vertical direction (Z), a multi-stage battery module group in which battery modules (23a to 23d) are disposed in plural stages in the vehicle vertical direction (Z) is further provided in addition to the single-stage battery module group , the single-stage battery module group and the multi-stage battery module group are arranged, particularly adjacent to each other, in a different direction (Y) from the arrangement direction (X), the flow divider is arranged between the first battery module and the second battery module in the single-stage battery module group , the flow divider is arranged in a manner to overlap the single-stage battery module group when seen in the arrangement direction (X), and the arrangement direction (X) is a vehicle width direction. <EOS>