期刊
METALS
卷 11, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/met11081195
关键词
lithium-ion battery; ultrasonic metal welding; alignment; weldability; multilayered
资金
- Technology Development Program - 2019 Ministry of SMEs and Startups (MMS, Korea) [S2798672]
- KITECH (Korea Institute of Industrial Technology) [EO210005]
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [S2798672] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [EO210005] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study analyzed the application of UMW technology in lithium-ion battery cells, investigating the impact of alignment on welding quality and the effects of various process parameters on welding performance.
The battery performance of electric vehicles depends on the density and capacity of the battery; thus, the battery cells must be assembled in as many layers as possible. Electric vehicle batteries are typically composed of several cells which form modules connected by busbars, with dozens of modules manufactured as battery packs. The ultrasonic metal welding (UMW) technology is applied to such multilayered foil welding. This study analyzed UMW to ensure the weldability of multilayered Cu foils and a Ni-plated Cu strip in lithium-ion battery cells through various approaches. In UMW, the effect of the alignment on weld production and quality were examined through the energy and mechanical performance of the weld by conducting comparative experiments on the alignment of the horn and anvil. Additionally, the effects of UMW process parameters, such as the welding pressure, amplitude, and welding time, were statistically analyzed. The weldability evaluation and characteristic analysis were performed based on these variables. Furthermore, the cross-sectional shapes and microstructure behavior of the Ni layers were analyzed based on the weld quality.
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