Energy storage device and photovoltaic energy storage system

An energy storage device, comprising:

• a heat management module comprising a multi-way valve, a first evaporator, and a condenser that are disposed in a housing, wherein the housing comprises a plurality of first interfaces, two coolant ports of the first evaporator are connected to the multi-way valve, and two coolant ports of the condenser are connected between the multi-way valve and one of the first interfaces;
• a battery module comprising a battery and a battery heat exchange plate in contact with the battery, wherein two coolant ports of the battery heat exchange plate each are connected to the multi-way valve through one of the first interfaces;
• a first power unit comprising a power conversion system and a first power circuit heat exchange plate in contact with the power conversion system, wherein two coolant ports of the first power circuit heat exchange plate each are connected to the multi-way valve through one of the first interfaces;
• a second power unit comprising a direct current converter and a second power circuit heat exchange plate in contact with the direct current converter, wherein two coolant ports of the second power circuit heat exchange plate each are connected to the multi-way valve through one of the first interfaces;
• and
• a radiator module comprising a radiator, wherein two coolant ports of the radiator each are connected to the multi-way valve through one of the first interfaces.