From arcing to shorting out, protecting against electrical failures in an EV application can be challenging. To reduce these electrical issues, dielectric coatings have become a popular solution. Parker LORD® JMC-700K coating is a thermal-cure epoxy resin. In EV applications, this coating offers direct adhesion to a substrate while providing superior electrical insulation, heat resistance, and oil resistance. This coating works with various automotive applications, including cooling plates, heat sinks, and motor magnets in electric vehicles. Other applications also include automotive parts and industrial machines.
How JMC-700K Stacks Up Against Alternate Materials
Polyethylene Terephthalate (PET) film is a low surface energy coating as compared to JMC-700K. Plus, it is tricky to automate and apply because it is such a big film. PET film is also hard to stick to― the low surface energy of PET films makes adhesion difficult without a secondary process to activate the surface, such as plasma treatment. While plasma treatment does increase the adhesion, it also adds capital expenses and additional steps throughout the process. Otherwise, there's still a higher chance of delamination/disbonding with PET films that can lead to potential issues in battery packs such as hot spots.
Competing against PET film and powder coatings, JMC-700K is the better solution. Compared to JMC-700K, a powder coating does not have the same adhesion properties to the base substrate, so there is a higher risk of coating failure to the base metal. In the coating process, JMC-700K is a 1-component epoxy coating, and unlike a powder coating, it moves to where it is sprayed. In the powder coating process, the particles remain suspended in the air and float onto the surface designated for coating. And when the item has sharp edges or interior corners, the powder coating tends to fall short of reaching the corner or edge. Also, with powder coating, there is worse or less dielectric protection.
JMC-700K Coating Procedure
The coating process involves covering the cooling plate or heat sink with JMC-700K (see the coated heat sink to the right). After this, either a gap filler or a thermally conductive adhesive is dispensed onto the newly coated surface just before battery installation. Important to note, JMC-700K can be used on parts and devices that experience operating temperatures from -40°C to +180°C.
As battery packs become more energy-dense, less space remains for dielectric protective materials. Because of JMC-700K’s robust adhesion and good dielectric protection, even a thin layer (75 to 100 microns) has proven valuable for EV applications.
Our customers have access to a team of expert application engineers and support staff. Custom tailoring our products to fit your unique needs, we are ready to help with your coating applications for your products today. To learn more about Parker LORD® JMC-700K thermal-cure epoxy resin, get in touch with us here.