Battery tab attachment method and apparatus
First Claim
1. A tab attachment comprising a thin metal layer laminated on a thin plastic layer, a metal tab, and a wire;
- said wire wire-bonded to said thin metal layer and said wire wire-bonded to said metal tab whereby an electrical connection is established between the metal tab and the thin metal layer;
further comprising a mechanical bond between the thin metal layer and the metal tab;
wherein said mechanical bond comprises a bond selected from the group consisting of tape, glue and adhesive;
further comprising said wire bonds placed toward the ends of the wire, wire-bonded to the thin metal layer and the tab.
1 Assignment
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Accused Products
Abstract
The difficulties encountered with attaching tabs to very thin metal layer, e. g., a layer of gold from 0.3 μm to 50 μm thick are severe. Typically, in the uses envisioned for the thin metal layer, which is for a compact battery, a plastic sheet such as polyimide underlies the thin metal layer. Polyimide has a relatively low melting point. The thin polyimide substrate melts when resistance welding is used. Ultrasonic welding doesn'"'"'t work because the sound wave energy is absorbed by the polyimide. This invention solves the attachment problem by using wire bonding to the thin metal sheet and to its tab. The tab attachment for a thin metal layer comprises a thin metal layer, a metal tab, and a wire and the wire is bonded to the thin metal layer and the wire is bonded to the metal tab. The thin metal layer may be gold; the thickness of the gold is between 0.3 μm and 50.0 μm.
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Citations
7 Claims
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1. A tab attachment comprising a thin metal layer laminated on a thin plastic layer, a metal tab, and a wire;
- said wire wire-bonded to said thin metal layer and said wire wire-bonded to said metal tab whereby an electrical connection is established between the metal tab and the thin metal layer;
further comprising a mechanical bond between the thin metal layer and the metal tab;
wherein said mechanical bond comprises a bond selected from the group consisting of tape, glue and adhesive;
further comprising said wire bonds placed toward the ends of the wire, wire-bonded to the thin metal layer and the tab. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- said wire wire-bonded to said thin metal layer and said wire wire-bonded to said metal tab whereby an electrical connection is established between the metal tab and the thin metal layer;
Specification