Battery pack liquid cooling system

The invention belongs to the technical field of power battery thermal management systems, and particularly relates to a battery pack liquid cooling system. The system comprises a battery box body, a plurality of mounting brackets arranged in the battery box body and a battery module. The plurality of mounting brackets are uniformly distributed at the bottom of the battery box body. A battery module is mounted between two adjacent mounting brackets, a heat-conducting silica gel pad is arranged on the lower side of the battery module, a liquid cooling plate is arranged on the lower side of the heat-conducting silica gel pad, a buffer pad is arranged on the lower side of the liquid cooling plate, the lower side of the buffer pad is in close contact with the bottom end in the battery box body,and the liquid cooling plate is limited and fixed with the mounting brackets through Z-shaped fixing keys and bolts. The liquid cooling plate comprises an upper cooling plate and a lower cooling plate. The lower cooling plat