A cooling system for a battery comprising: a duplex pipe comprising an internal pipe and an external pipe outside the internal pipe; an internal unitary pipe connected to the duplex pipe and to be arranged at a side of a battery cell, the internal unitary pipe including an internal inlet adapted to transmit a cooling fluid into the internal unitary pipe and an internal outlet adapted to transmit the cooling fluid from the internal unitary pipe; a heat exchanger connected to the duplex pipe and configured to accommodate the passage of the cooling fluid therein; and an external unitary pipe connected to the duplex pipe and arranged in the heat exchanger, the external unitary pipe including an external outlet adapted to transmit the cooling fluid from the external unitary pipe and an external inlet adapted to transmit the cooling fluid into the external unitary pipe, wherein the internal inlet of the internal unitary pipe is connected to the internal pipe and the internal outlet of the internal unitary pipe is connected to the external pipe, or the internal outlet of the internal unitary pipe is connected to the internal pipe and the internal inlet of the internal unitary pipe is connected to the external pipe, wherein the external outlet of the external unitary pipe is connected to the internal pipe and the external inlet of the external unitary pipe is connected to the external pipe, or the external inlet of the external unitary pipe is connected to the internal pipe and the external outlet of the external unitary pipe is connected to the external pipe, and wherein the internal unitary pipe and the external unitary pipe have a higher heat transfer coefficient than the duplex pipe such that a heat exchange efficiency is improved by the internal unitary pipe and the external unitary pipe. a duplex pipe comprising an internal pipe and an external pipe outside the internal pipe; an internal unitary pipe connected to the duplex pipe and to be arranged at a side of a battery cell, the internal unitary pipe including an internal inlet adapted to transmit a cooling fluid into the internal unitary pipe and an internal outlet adapted to transmit the cooling fluid from the internal unitary pipe; a heat exchanger connected to the duplex pipe and configured to accommodate the passage of the cooling fluid therein; and an external unitary pipe connected to the duplex pipe and arranged in the heat exchanger, the external unitary pipe including an external outlet adapted to transmit the cooling fluid from the external unitary pipe and an external inlet adapted to transmit the cooling fluid into the external unitary pipe, wherein the internal inlet of the internal unitary pipe is connected to the internal pipe and the internal outlet of the internal unitary pipe is connected to the external pipe, or the internal outlet of the internal unitary pipe is connected to the internal pipe and the internal inlet of the internal unitary pipe is connected to the external pipe, wherein the external outlet of the external unitary pipe is connected to the internal pipe and the external inlet of the external unitary pipe is connected to the external pipe, or the external inlet of the external unitary pipe is connected to the internal pipe and the external outlet of the external unitary pipe is connected to the external pipe, and wherein the internal unitary pipe and the external unitary pipe have a higher heat transfer coefficient than the duplex pipe such that a heat exchange efficiency is improved by the internal unitary pipe and the external unitary pipe. <EOS>