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Ultrasonic Bonding of Multi-Layered Foil Using a Cylindrical Surface Tool

1
Graduate School of Science and Technology, Niigata University, Niigata 9502181, Japan
2
Nissan Motor Co., Ltd, Kanagawa 2520012, Japan
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 505; https://doi.org/10.3390/met9050505
Received: 15 April 2019 / Revised: 26 April 2019 / Accepted: 28 April 2019 / Published: 29 April 2019
(This article belongs to the Special Issue Opto-Acoustic Characterization of Metals)
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Abstract

A cylindrical tool was applied for ultrasonic bonding of multi-layered copper foil and a copper sheet to prevent damage to the foil during bonding. The strength of the joints bonded with the cylindrical tool was comparable to that of the joints bonded with a conventional knurled tool. The effect of the cylindrical surface tool on bondability was investigated thorough relative motion behaviors between the tool surface and the bonding materials, as well as on bond microstructure evolution. The relative motion was visualized with in-situ observation using a high-speed camera and digital image correlation. At shorter bonding times, relative motions occurred at the bonding interfaces of the foil and the copper sheet. Thereafter, the relative motion between the tool and the bonding material became predominant owing to bond formation at the bonding interface, resulting in a macroscopic plastic flow in the bonded region. This relative motion damaged the foil in knurled tool bonding, and the cylindrical tool achieved bonding without any damage. View Full-Text
Keywords: ultrasonic bonding; lithium-ion battery; multi-layered foil; tool geometry; relative motion; plastic flow ultrasonic bonding; lithium-ion battery; multi-layered foil; tool geometry; relative motion; plastic flow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Arimoto, K.; Sasaki, T.; Doi, Y.; Kim, T. Ultrasonic Bonding of Multi-Layered Foil Using a Cylindrical Surface Tool. Metals 2019, 9, 505.

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