BATTERY PACK AND ENERGY STORAGE SYSTEM

Provided are a battery pack and an energy storage system, relating to the technical field of energy, and aiming to solve the problem of unreasonable heat dissipation structures of existing battery packs. The provided battery pack comprises a heat exchange plate assembly and a battery cell assembly. The heat exchange plate assembly comprises a first liquid collection pipe and heat exchange plates, each heat exchange plate comprising a cooling liquid channel and a plurality of openings, at least one opening of the cooling liquid channel being arranged on one end surface of the heat exchange plate, and the first liquid collection pipe communicating with the at least one opening of the cooling liquid channel. The first liquid collection pipe comprises at least one flow resistance regulation device, each flow resistance regulation device comprising sliding grooves and resistance regulation blocks, the sliding grooves communicating with one opening of the cooling liquid channel, and the resistance regulation blocks