Wevo Lannched a Battery Adhesive Systems for High-Performance EVs
High temperatures are generated in the battery cells of electric vehicles (EVs) during charging and these have to be dissipated. Until now, this has mostly been achieved by inserting silicone-based pads between the cells and the cooling system. However, the manufacturing process of batteries is increasingly demanding that "thermal interface materials" (TIMs) with adhesive properties be used – something silicone pads are not able to provide.
Wevo adhesive systems reliably dissipate the heat generated during the charging process from the battery cells to the heat sink.
WEVO-CHEMIE GmbH has therefore developed liquid adhesive systems that offer better surface wetting and can also be used as structural adhesives. In addition to optimized heat dissipation, these customizable polyurethanes also open up new possibilities in the design process.
The ongoing upgrade of the system voltage of EVs from 400V to 800V is leading, among other things, to an increase in the efficiency of the battery charging process. However, this results in high temperatures – also in the battery cells. TIM pads no longer provide adequate heat dissipation in these cases. That's because the inlaid solutions that are inserted between the cells and the cooling system do not fully compensate for the uneven surfaces of the cells and cooling system (see figure). This can lead to hotspots and damage to the cells.
What's more, insertion solutions such as pads can no longer satisfy the complex geometries of modern battery design concepts. The customized liquid adhesive systems developed by Wevo are the perfect solution for the job. They are flexible and are applied directly to the cooling system – three-dimensional if required – and pressed together with the battery cells. This prevents air voids from forming and ensures immediate dissipation of the heat generated by the cooling system.
PROPERTIES MATCHED TO STATE-OF-THE-ART BATTERY DESIGNS
Wevo has set the thixotropy and therefore the rheological properties of these adhesive systems such that they can be applied as a vertical bead that doesn't collapse even if the components are tilted or rotated as part of the manufacturing process. At the same time, the corresponding special fillers ensure that the viscosity of the potting compound doesn't rise disproportionately to the thermal conductivity. This enables trouble-free processing in standard dosing systems despite the compound's high thermal conductivity. The reactivity of the materials is individually adjusted to the customer's particular process – for fast downstream processing and short production cycles.
What's more, these Wevo products can be used as structural adhesives for durable and dimensionally stable bonding applications. This makes it easier for battery manufacturers to overcome the challenges they come up against in the design process. That's because the polyurethane adhesives make it possible, for example, to dispense with certain screwed connections, helping to reduce the overall weight of the battery and increase the range it offers.
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本文由Vicky转载自Wevo News，原文标题为:Battery adhesive systems for high-performance EVs，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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