| Summary: | 碩士 === 華梵大學 === 工業工程與經營資訊學系碩士班 === 94 === In recent years, communication and electronic products, such as cellular phone, PDA, digital camera, GPS satellite navigation system, have become the order of the day. Consequently, secondary battery industry has also risen abruptly. However, the ultrasonic welding process technology will directly influence the performance and security of lithium battery. This problem is always perplexing lithium battery factories on their production system. In the past, most of the battery factories rely on the rule-of-thumb experience of staffs for the settings of the welding process under the subjective and non-scientific manner.
This research focuses on the optimization of ultrasonic welding process parameter design for lithium battery fabrication using relevant theories of Taguchi experimental method. First, an orthogonal array is properly chosen as a basis for S/N analysis and analysis of variance. Through Grey Relational Analysis (GRA) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method, multiple quality characteristics are synthesized to discover the best parameter combination of ultrasonic welding process for lithium battery fabrication. Finally, a validation experiment is conducted to confirm the best parameter combination for lithium battery.
This research extracts some important parameters for the ultrasonic welding process: meltdown time, hardened time, compressed pressure and delay time. After the experiments, the GRA and TOPSIS are employed to synthesize fuzzy and quantifiable quality characteristics for selecting the best parameter combination. After the synthetic process, significant parameters with the most appropriate level (harden time: 0.29 sec.; compressed pressure: 1.7 kg; dealy time: 0.60 sec.) are revealed from the best parameter combination. Namely, they have the quality characteristics being comparatively influenced according to the result from the validation experiment.
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