Power storage device, transport equipment, and control method

A power storage device comprising:

• a storage battery capable of transferring electric power to and from an external electric power network;
• a receiver configured to receive an instruction related to transfer of the electric power to and from the electric power network;
• and
• a controller configured to control charge and discharge of the storage battery according to the instruction,
• wherein the instruction includes a first instruction for requesting switching between short-term charge and discharge from the storage battery to the electric power network, and a second instruction for requesting continuous discharge from the storage battery to the electric power network,
• wherein the controller is configured to allow the storage battery to charge and discharge that correspond to the first instruction when a variable representing a state of charge of the storage battery by a level of a value is within a first range, and to allow the storage battery to discharge that corresponds to the second instruction when the variable is within a second range, and
• wherein the first range is narrower than the second range, and an upper limit of the first range is lower than an upper limit of the second range.

A control method for a power storage device including a storage battery capable of transferring electric power to and from an external electric power network, a receiver configured to receive an instruction related to transfer of the electric power to and from the electric power network, and a controller configured to control charge and discharge of the storage battery according to the instruction, wherein

• the instruction includes a first instruction for requesting switching between short-term charge and discharge from the storage battery to the electric power network, and a second instruction for requesting continuous discharge from the storage battery to the electric power network, and
• the control method comprises:
• allowing the storage battery to start charge and discharge that correspond to the first instruction, when a variable representing a state of charge of the storage battery by a level of a value is a value between a first value smaller than an upper limit value that the state of charge reaches when the storage battery is fully charged and a second value smaller than the first value;
• and
• allowing the storage battery to start discharge that corresponds to the second instruction, when the variable is a value between the upper limit value and the second value.