Energy management system

An energy management system applied to a vehicle, the vehicle has:

• a first power source that radiates heat to a first heat medium when generating power by converting an energy of a fuel supplied from an outside;
• a first converter that converts the power generated in the first power source into an electricity;
• an electricity storage part that stores the electricity converted in the first converter;
• and
• a second power source that generates power by converting the electricity stored in the electricity storage part;
• the energy management system comprising:
• a second converter that converts the electricity converted in the first converter into heat;
• a heat storage part that stores the heat converted in the second converter;
• a mode switching part that switches between a heat storage mode in which the heat storage part stores the heat converted in the second converter and a heat radiation mode in which the heat storage part radiates the heat to a heat transfer target;
• and
• a controller that controls operations of the second converter and the mode switching part, wherein
• the heat storage part changes to a first phase in a solid state when a temperature of the heat storage part is lower than or equal to a phase transition temperature, and changes to a second phase in a solid state when a temperature of the heat storage part exceeds the phase transition temperature,
• the heat storage part stores heat or radiates heat due to a phase transition between the first phase and the second phase, and
• the controller controls the operations of the second converter and the mode switching part based on at least one of an electricity storage condition of the electricity storage part and a conversion condition of the first converter.