A battery pack , comprising: at least one battery module including at least one battery cell and having a cooling pipe unit including a pipe housing and a connection pipe disposed in the pipe housing and including a coolant flow path for cooling the at least one battery cell ; a pack case configured to accommodate the at least one battery module ; a coolant inflow and outflow pipe mounted through the pack case and connected to the connection pipe inside the pipe housing to supply a coolant to the coolant flow path from the outside of the pack case and discharge the coolant from the coolant flow path to the outside of the pack case ; a first sealing unit disposed between the coolant inflow and outflow pipe and the pack case ; and a second sealing unit disposed to be spaced apart from the first sealing unit by a predetermined distance and disposed between an inner pipe of the coolant inflow and outflow pipe and the pipe housing of the cooling pipe unit , wherein the coolant inflow and outflow pipe includes: a pipe body provided through the pack case and disposed to contact an outer surface of the pack case ; an outer pipe configured to protrude out of the pack case from the pipe body and connected to an external cooling unit (C); and the inner pipe disposed to be spaced apart from the outer pipe by a predetermined distance, configured to protrude into the pack case from the pipe body , and connected to the connection pipe of the cooling pipe unit . at least one battery module including at least one battery cell and having a cooling pipe unit including a pipe housing and a connection pipe disposed in the pipe housing and including a coolant flow path for cooling the at least one battery cell ; a pack case configured to accommodate the at least one battery module ; a coolant inflow and outflow pipe mounted through the pack case and connected to the connection pipe inside the pipe housing to supply a coolant to the coolant flow path from the outside of the pack case and discharge the coolant from the coolant flow path to the outside of the pack case ; a first sealing unit disposed between the coolant inflow and outflow pipe and the pack case ; and a second sealing unit disposed to be spaced apart from the first sealing unit by a predetermined distance and disposed between an inner pipe of the coolant inflow and outflow pipe and the pipe housing of the cooling pipe unit , wherein the coolant inflow and outflow pipe includes: a pipe body provided through the pack case and disposed to contact an outer surface of the pack case ; an outer pipe configured to protrude out of the pack case from the pipe body and connected to an external cooling unit (C); and the inner pipe disposed to be spaced apart from the outer pipe by a predetermined distance, configured to protrude into the pack case from the pipe body , and connected to the connection pipe of the cooling pipe unit . a pipe body provided through the pack case and disposed to contact an outer surface of the pack case ; an outer pipe configured to protrude out of the pack case from the pipe body and connected to an external cooling unit (C); and the inner pipe disposed to be spaced apart from the outer pipe by a predetermined distance, configured to protrude into the pack case from the pipe body , and connected to the connection pipe of the cooling pipe unit . <EOS>