Battery pack and energy storage system

An energy storage system comprising:

• a battery pack that comprises a housing;
• and
• a power converter configured to:
• perform power conversion on electric energy output by an external power supply, and
• output converted electric energy to the battery pack, wherein
• an internal space of the housing comprises a battery compartment and an electrical compartment that are adjacently disposed in a length direction of the housing,
• the battery compartment is configured to accommodate a battery module,
• the battery module comprises a plurality of electrochemical cells,
• each of the plurality of electrochemical cells comprises a top surface and a bottom surface that are disposed opposite to each other in a height direction of the housing,
• two poles are disposed on the top surface,
• each electrochemical cell is further provided with a vent valve,
• the vent valve is located on the top surface or the bottom surface,
• the electrical compartment is configured to accommodate a power module;
• and
• in an electrochemical cell of the plurality of electrochemical cells close to the electrical compartment, a barrier strip is disposed between a surface on which the vent valve is located and an inner wall of the housing,
• the barrier strip is located on a side of the vent valve facing the electrical compartment, and
• the barrier strip is configured to isolate the vent valve from the power module.