Perpustakaan Digital ITB

To achieve the target of zero net emissions by 2060, lithium-ion batteries are essential for future renewable energy sources. Numerous studies have investigated the parameters of spot welding between battery cells and tab connectors, focusing on welding quality and tensile strength. This research aims to analyse the effects of varying the number of spot welds on 18650 battery cell temperature and mechanical properties, using peel tests assisted by digital microscopy to further examine the weld joints. The spot welding procedure began with 2 spots, increasing in multiples of two, and concluded with 10 spots. The impact of varying the number of spot welds on battery temperature was assessed through a discharge performance test, with temperature data collected using a thermal imaging camera. Additionally, peel tests were conducted to evaluate the mechanical properties of the weld joints, with digital microscopy providing detailed images of the weld joint conditions, offering new perspectives compared to existing research. The results of this study indicated a decrease in maximum battery temperature from 2 to 6 spots, followed by a sudden increase from 8 to 10 spots, with the latter exhibiting higher temperatures than the 2-spot configuration. Peel test results demonstrated that the weld joint strength was highest at 6 spots, with the greatest breaking force and displacement, and lowest at 4 spots. Microscopic images revealed the welding quality, which influenced the peel test outcomes.