How to Select Potting Compounds for New‑Energy‑Vehicle ECUs? How to Balance Waterproofing, Vibration Resistance and Thermal Conductivity?

Material selection for new‑energy‑vehicle ECUs shall first determine whether full potting, partial potting, thermal gap filling or conformal coating is required based on ECU mechanical construction. For controllers requiring low‑stress full‑module protection, Elaplus SIPA 1850 thermally‑conductive silicone potting system may be evaluated. PUR‑series formulations are an option for structures demanding flexible protection. For gap‑type heat dissipation between ECU power devices and housings, TCMP 1935 thermal conductive gels can be deployed. ECU Potting for Automotive Electronics Why “Fully‑filled Potting” Does Not Equal Reliable ECU Protection An ECU typically integrates multiple components: ‑ MCU chips ‑ MOS power devices ‑ PCBs ‑ Capacitors ‑ Electrical connectors ‑ Copper busbars ‑ Aluminum housings Different zones face distinct failure risks. For instance, PCBs mainly require moisture‑proofing and vibration resistance; MOSFETs call for effective heat dissipation; connector root sections need waterproof protection; housings rely on reliable sealing. Accordingly, a single ECU may adopt a combined material solution: potting compounds + thermal conductive gels + sealants + conformal coatings, rather than depending on one single adhesive to cover all requirements. Why Low‑stress Formulations Are Preferred for Full ECU Potting Numerous solder joints are populated on PCBs. When high‑hardness resin is applied for large‑volume encapsulation, stress generated by cure shrinkage and thermal cycling can transfer onto: ‑ BGA packages ‑ Solder joints ‑ Capacitors ‑ Semiconductor chips ‑ Connector root terminals Low‑stress performance therefore becomes a critical selection criterion for assemblies populated with stress‑sensitive electronics. Elaplus SIPA 1850 Two‑Component Thermally‑Conductive Silicone Potting Compound Recommended for applications where both thermal performance and low‑stress encapsulation are required. Thermal‑dissipation Solutions for ECU Power Devices If heat bottlenecks occur exclusively at the interface between MOSFETs and metal housings, massive full‑volume potting is unnecessary to resolve a localized thermal issue. Instead, TCMP 1935 two‑component liquid thermal conductive gel fills gaps between power components and heat‑dissipation…