Battery management apparatus and method for monitoring abnormalities in battery dielectric coolant, and immersion-type energy storage device utilizing the same

A battery management method performed by a device comprising a processor and a memory that stores program instructions executed by the processor, the battery management method comprising:

• receiving, from a temperature sensor array including a plurality of temperature sensors at different vertical positions, a temperature signal detected by at least one of the plurality of temperature sensors;
• determining, based on a current signal provided by a current sensor, whether one or more battery cells are in a charging state or a discharging state;
• and
• upon determining that the one or more battery cells are in the charging state or the discharging state, determining whether a defect has occurred in insulating oil configured to immerse at least part of the one or more battery cells based on whether a pattern of the temperature signal detected by the plurality of temperature sensors has changed over time.