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; 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; 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; 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.