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A Very Large Area Wirebonder for Bonding Battery Modules in a Single Pass
Keywords: Wirebonding, car batteries, e-vehicles
A leading technology for building battery modules for electric vehicles employs standard consumer Lithium battery cells of the 18650 type, mainly because of cost and availability. Due to the huge number of cells required for a typical car battery module, a tremendous number of connections between the cells has to be made, and wirebonding using aluminum wire is an obvious contender for this because of low cost and high interconnection quality. Given that as much as 50% of the total cost of a battery unit can be caused by the interconnection and cage, this is of great interest. One of the drawbacks so far has been the limited work area of standard wire bonders which requires to break up a battery module into a number of smaller units which can be bonded individually and then have to be connected using other standard methods. We wish to describe a wirebonder developed especially for very large circuits up to 45 by 24 inches, such as solar cells and battery modules, which can be bonded in a single pass at extremely high quality, excellent yield and very low cost. Exploiting a range of different ultrasonic frequencies and specialized process control, even tricky cell types with resonance problems can be bonded with excellent yields.
Dr Josef Sedlmair,
F&K Delvotec Bondtechnik, Ottobrunn
Ottobrunn, Germany
Germany


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