NOVELTY - The cooling device (1) has a cavity (2) through which the cooling fluid (3) is flowed and includes a pipe section (4) and a fluid communicating associated cooling section (7). The cooling section is thermally coupled with the battery unit (20).The pipe section is provided with a plastic material. The cooling section is provided with a metal material. The plastic material of the pipe section and the metal material of the cooling section are linked by a nanomold method. The pipe section is provided with a supply line section (5) and a discharge portion (6).    USE - Cooling device for battery unit used in hybrid vehicle and electric car.    ADVANTAGE - The cooling section is provided with the metal material, so that the thermal coupling between the cooling fluid and the battery unit is achieved. An efficient cooling or heating of the battery unit is ensured. The pipe section is provided with the plastic material, so that the weight of the cooling device is saved. An escape of cooling fluid at the junction between the plastic material of the pipe section and the metal material of the cooling section is reliably prevented. The provision of a small wall thickness of the cavity in the area of the cooling section is used to increase the thermal coupling of the battery unit to the cooling fluid. The mechanical stability of the cooling section is enhanced. A quick and easy production of the cooling device is achieved. The cooling device with a high thermal energy transfer ability is achieved. The cooling section is provided with the metal material, so that the cooling performance of the cooling device is increased.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing a cooling device for a battery unit.    DESCRIPTION OF DRAWING(S) - The drawings show the sectional views of the cooling device for battery unit.    Cooling device (1)    Cavity (2)    Cooling fluid (3)    Pipe section (4)    Supply line section (5)    Discharge portion (6)    Fluid communicating associated cooling section (7)    Battery unit (20)