![]() ![]() ![]() The important aspect is to request a “mid-phos” bath of 4-11% as this is ideal for wire bonding. These are off-the-shelf chemistries that are excellent for wire bonding. If you do use a Cu busbar, then you need to plate it with ENIG (Electroless Nickel Immersion Gold) or ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold). ![]() We have also found success wire bonding to other Al such as 3003, 5052 6061 but one needs to review the technical specifications of these aluminum to ensure resistivity, conductivity, etc. A thickness of 1-2mm should be sufficient, but it is not recommended to make the busbar too thick as this could inhibit bond head clearance in relation to the top of the cylindrical cell. We have found that Al1145 is the best metal. As for the busbar material, it is best if it is also aluminum. For wire bonding with aluminum wire, it would be ideal if the metal can was aluminum as a mono-metallic system is optimum. Photo courtesy of Purdue University Race Team.Īlmost all of the cylindrical cells have an electrolytic nickel over stainless steel metallization. Wire bonded battery pack for Formula SAE Race Car. We normally use a back-cut arrangement where the cutter blade is positioned behind the bond tool to enable the most clearance for the bond head. This is done for practical purposes as if for some reason you encounter a non-stick on the cell, you could easily rework it. Removes the oxide layer and exposes virgin aluminum to enable the transfer ofįor wire bonding battery packs, Hesse prefers to bond onto the cell first and then up to the busbar. The aluminum oxide, which is self-limiting,Īctually helps optimize the wire bonding process as the ultrasonic process Surface as the wire and surface share electrons. Ultrasonic energy to have the wire or ribbon form an atomic bond with the Resistance welding, spot welding, laser welding and wireīonding are the more common interconnection methods. Present time, there are a handful of methods of interconnecting cylindricalĬells to the busbar. It will involve everything between the battery pack housing to the Wire or ribbon bonding process for battery packs using cylindrical lithium-ionĬells. ThisĪrticle will review the design guidelines for how to successfully implement a Is becoming more mainstream in the alternative energy market these days. Posted Jby Charged EVs & filed under Newswire, Sponsored Content, The Tech.īy Mike McKeown and Dr. Design guidelines for wire or ribbon bonding of cylindrical cells in battery packs ![]()
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