Ukraine, Kyiv, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute".

The work investigates a way to extend the lifespan of electric vehicle battery packs. Currently, there is a notable absence of solutions for recycling and disposal of lithium-based battery packs. Therefore, investigating possible ways to prolong the lifespan of existing electric vehicle battery packs becomes crucial to delay their disposal and allow more time to find new effective recycling solutions. This study analyzes the average daily mileage of vehicles in Ukraine and other countries, revealing that it does not exceed 50 km per day. This mileage is significantly lower than the full charge-discharge cycle range of any electric vehicle traction battery pack. The authors investigated the impact of limiting the depth of discharge of the battery pack on its lifespan and found that by restricting the depth of discharge to 50%, the battery lifespan could increase by 20%. Statistical data from other scientists were gathered and organized to analyze the influence of the depth of discharge on the battery lifespan across different charge levels during the charge-discharge cycle. It was shown that when using battery packs with the same depth of discharge but in different charge-discharge cycle ranges, the batteries degrade differently. In conclusion, it was noted that to increase the battery lifespan, it is essential to keep it in the optimal charge level range for as long as possible. The paper provides recommendations for identifying this optimal charge level range. It proposes ways for upgrading electric vehicle control systems that can increase the lifespan of their traction battery pack without setting substantial restrictions for users.

Keywords: electric vehicle, battery, state of charge, partial cycle, battery lifespan.

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