Understanding Energy Calculations for Containerized Battery
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4. Conclusions A system model of a stationary lithium-ion battery system is created for a use-case specific analysis of the system energy efficiency. The model offers a holistic approach by calculating conversion losses and auxiliary power consumption.
For validation of energy loss calculation, full cycle tests at different current rates are conducted on a single cell placed in an isothermal battery calorimeter at 30 °C. Thus, energy losses can be calculated both from electrical measurement at the cell as well as from cell heat rate to ambient.
The capacity of a battery or accumulator is the amount of energy stored according to specific temperature, charge and discharge current value and time of charge or discharge.
It features eight battery racks, which are each coupled to the low voltage grid with bidirectional inverters. For thermal management, the system has a two-zone climate system for separate and energy efficient temperature control of the battery racks and the power electronics, which are both air cooled.
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