Safe Discharge of Lithium-ion Battery Using Wireless Power Transfer

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master_Abbas_Hashim_2025.pdf (1.96 MB)

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School of Electrical Engineering | Master's thesis
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Date

2025-05-25

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Major/Subject

Energy Systems and Markets

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Degree programme

Master's Programme in Advanced Energy Solutions

Language

en

Pages

67

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Abstract

With the evolution of battery energy storage systems, the need for mining valuable materials like lithium for battery production has increased. At the same time, significance of using recycled materials in producing new batteries is crucial. It is important to safely discharge the batteries completely before recycling them. This thesis focuses on this issue and the factors that effect this discharging process. Having an integrated battery management system (BMS) helps in ensuring safe and effective functionality of a battery during discharge. The effect of voltage rebound, and cell mismatching are highlighted because they may lead to capacity loss and safety concerns, particularly during recycling. Emphasis is placed on the risks of residual energy in recycled batteries, and the dangers of thermal runaway when handling weakly discharged cells. The working of BMS to monitor voltage, temperature, and current to optimize battery performance is studied in detail with practical experiments. This thesis discusses different wireless power transfer (WPT) techniques and focuses on inductive power transfer to wirelessly discharge the batteries, thus establishing this method to being implemented for the first time. This technique offers a new alternative to transfer power without any physical connection between transmitter and receiver. A series of experiments for discharging batteries of same and different initial voltages were conducted. The results show the effect of voltage rebound after discharging them. Some of the batteries were successfully wirelessly discharged to 0V after series of tests at different currents. Hence, the system with the integration of BMS with WPT ensures safe and wireless discharge of lithium-ion batteries and with upgradations can discharge batteries of higher capacity being used in industries, ensuring their safe discharge before recycling them.

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Supervisor

Santasalo-Aarnio, Annukka

Thesis advisor

Garg, Neha

Keywords

battery management system, thermal runaway, wireless power Transfer, inductive power transfer, voltage rebound, discharging battery

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https://urn.fi/URN:NBN:fi:aalto-202506104442

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