Battery pack and energy storage system

The invention provides a battery pack and an energy storage system, relates to the technical field of energy, and aims to solve the problem that a heat dissipation structure of an existing battery pack is unreasonable. The battery pack provided by the invention comprises a heat exchange plate assembly and a battery cell assembly, the heat exchange plate assembly comprises a first liquid collecting pipe and a heat exchange plate, the heat exchange plate comprises a cooling liquid channel and a plurality of openings, at least one opening of the cooling liquid channel is formed in one end face of the heat exchange plate, and the first liquid collecting pipe communicates with the at least one opening of the cooling liquid channel; the first liquid collecting pipe comprises at least one flow resistance adjusting device, each flow resistance adjusting device comprises a sliding groove and a resistance adjusting block, the sliding grooves are communicated with one opening of the cooling liquid channel, and the resis