Thermoconductive adhesive for EV batteries: influence of reactivity and rheology over adhesion properties

In the rapidly evolving era of sustainable mobility, battery technologies for electric vehicles play a crucial role in shaping the future of our society. The efficiency and reliability of these batteries depend not only on the quality of their components but also on how they are assembled to allow good heat dissipation. In this context, thermally conductive two-component polyurethane-based adhesives emerge as key elements in constructing reliable and high-performance batteries. The purpose of this work was to synthesize polyurethane-based adhesives composed of two distinct parts and to investigate how variations in viscosity, catalyst composition, and the inclusion of an adhesion enhancer influence adhesives performance. The study involved the systematic synthesis of the adhesive components followed by a detailed characterization, focusing on how these variations impact their performance in meeting specific customer requirements. The results showed how variations in the rheological properties of different adhesives affect the performance of the final product, leading to its optimization. Next, it was possible to study which catalyst leads to the best adhesive performance and finally how the content and presence of adhesion enhancer affect the adhesive properties and aging resistance.