In order to solve the problem that it is difficult for existing thermal management schemes to actively and efficiently create low temperature heat sink in limited enclosed space

a composite thermal management system based on flat-plate heat pipes is proposed in this study. The numerical simulation model of the composite system is established

and the experimental platform of the composite thermal management system is set up to verify the accuracy of the model. The results show that the proposed composite thermal management system provides low temperature heat sink for the whole thermal management system in a limited space

and solves the phenomenon of high heat flow heat accumulation at the hot end of the thermoelectric refrigeration unit by coupling the plate heat pipe

thus reducing the temperature at the hot end of the thermoelectric refrigeration unit and the temperature difference between the cold and hot ends

and further improving the cooling capacity and COP. The thermoelectric refrigeration system based on flat-plate heat pipe is much better than the thermoelectric refrigeration system based on aluminum fins in the overall working current

and the cooling capacity and COP of a single cooling plate are effectively increased by 38.35% and 14.81% under the best working condition.