▎ 摘　　要

NOVELTY - The system has a four-way valve whose pipeline is connected with a S port of a compressor and a D port of the compressor. Another pipeline is orderly connected with an E port of an E-port, a cold plate, an expansion valve, a condenser and a C-port of the four valve. The four valve is provided with a heat pump liquid cooling/preheating system. The heat pump is connected to the heat pump. USE - Battery pack thermal management system of graphene and coupling pump used in electric automobile battery heat management field, especially for power battery low temperature preheating and high temperature heat safety management technology. ADVANTAGE - The damage of the battery caused by the low-temperature graphene heater power supply is transferred to the auxiliary battery pack by the power battery pack, thus ensuring the service life of the electric vehicle endurance. The cold preheating efficiency is low, low temperature pre-heating energy utilization rate is low and cooling problem at high temperature is solved, so as to improve power battery service life. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a Battery pack thermal management system. (drawing includes non_English language text). Auxiliary battery pack (1) Controller (2) Power battery pack (3) Graphene element (4) Cold plate (5)