Global IP Counselors, LLP
Ultrasonic bonding tool and ultrasonic bonding method
An ultrasonic bonding tool is used on a horn side or anvil side of an ultrasonic joining device in which two synthetic resin sheets that include a polyethylene layer, a polypropylene layer and a ceramic heat-resistant layer are superposed and joined together so that the heat-resistant layers face each other. The ultrasonic bonding tool includes a plurality of protrusions shaped as quadrangular pyramids having a flat top surface. Each of the protrusions has an apex angle formed by two mutually opposite side surfaces that is within a range of 110-130°. When two separators of a battery cell are joined together using the ultrasonic bonding device with the ultrasonic bonding tool, a force with which the separators adhere to the protrusions is weak. In this way, the separators do not adhere to the horn during ultrasonic bonding of the synthetic resin sheets.
Envision AESC Japan Ltd.
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Takahiro
Nakano