Energy storage system

An energy storage system comprising:

• a battery configured to store a received electrical energy in a form of direct current, or to output the stored electrical energy;
• and
• a battery management system configured to control the battery,
• wherein the battery management system comprises:
• a sensing unit comprising a plurality of sensors for measuring voltage, current, and temperature of the battery;
• a memory configured to store a charge/discharge cycle count that is increased according to execution of charge/discharge cycle, and a power table including charging rate (C-rate) values corresponding to temperature of the battery and a state of charge (SOC) of the battery;
• and
• a microcomputer unit configured to decrease the C-rate values and store the decreased C-rate values in the memory, based on the charge/discharge cycle count reaching a reference number of times.

An energy storage system comprising:

• a battery configured to store a received electrical energy in a form of direct current, or to output the stored electrical energy;
• and
• a battery management system configured to control the battery,
• wherein the battery management system comprises:
• a sensing unit comprising a plurality of sensors for measuring voltage, current, and temperature of the battery;
• a memory configured to store a state of charge (SOC) of the battery, a state of health (SOH) of the battery, a charge/discharge cycle count that is increased according to execution of charge/discharge cycle, a under voltage protection level which is a reference value of a under voltage protection that protects from discharging at a certain voltage or lower, and a power table including charging rate (C-rate) values corresponding to temperature of the battery and the state of charge (SOC) of the battery;
• and
• a microcomputer unit configured to decrease the state of charge (SOC) of the battery, based on the charge/discharge cycle count reaching a reference number of times.