TECHNICAL COMPARISON BETWEEN FIRST AND SECOND LIFE BATTERY BANKS FOR COMMERCIAL-SIZE ON-GRID APPLICATION
DOI:
https://doi.org/10.59627/cbens.2022.1223Keywords:
Energy Storage, Electric Vehicles, Second Life BatteryAbstract
Electric vehicles are an alternative technology for reducing emissions into the atmosphere, when combined with the generation of energy from renewable sources. However, after a few years of use, the batteries lose some of their original capacity and need to be replaced. Recent studies and applications point to the feasibility of reusing these batteries after being removed from electric vehicles, an application known as second battery life. This work presents the application of second life batteries from Nissan LEAF vehicles for use in a commercial battery bank (100kWh) and comparison with a first life bank of the same size installed in the same environment and subjected to the same conditions. The capacity measurement of the two banks was carried out through loading and unloading tests which showed that both were reduced, due to the losses inherent to the system, such as auxiliary loads and internal consumption of the equipment. The real capacity in relation to the nominal capacity of the second life bank, as expected, was lower than that of the first life, due to factors such as the maximum and minimum operating voltage limitation of the bank by the Power Conversion System (PCS), the increase in internal resistance of cells, unbalance between cells, increase in temperature, among others. The use of second life batteries for this type of application proved to be technically feasible, but it presents challenges such as the lack of compatible electronic control systems in the market and the need to characterize the modules for the use of batteries with different background in the same system.
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