HENKEL: THERMAL POTTING FOR EV COMPONENTS – LOCTITE® SI 5643
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Comparison with Other Embedding Techniques:
- Potting vs. Encapsulation vs. Impregnation:
- Potting fills complex geometries and secures components permanently.
- Encapsulation offers protection for flat, sensitive surfaces.
- Impregnation is used to immerse components for enhanced heat dissipation.
- Potting vs. Encapsulation vs. Impregnation:
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Selection Criteria for Potting Materials:
- Performance factors such as thermal conductivity, chemical resistance, temperature tolerance, and voltage resistance.
- Production factors including shorter cycle times and compatibility with existing manufacturing processes.
- Importance of evaluating the specific operating conditions and design requirements of the EV component.
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Formulation Considerations:
- Comparison of different chemistries:
- Silicones: Offer high flexibility, excellent heat resistance (up to ~250°C), and superior vibration dampening.
- Epoxies: Provide high mechanical strength but may lack the flexibility needed for some applications.
- Urethanes and Polyacrylates: Suitable for lower temperature ranges with distinct strengths and limitations.
- Engineers must match the formulation to the specific thermal, mechanical, and production needs.
- Comparison of different chemistries:
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Customer Case Study:
- Henkel’s LOCTITE® SI 5643 thermal potting compound was tested on an AC/DC converter.
- The compound demonstrated superior thermal performance and durability by maintaining lower and more uniform temperatures while preventing ferrite core cracking compared to a competitor’s product.
- This highlights the importance of considering the complete performance profile of a potting material rather than relying solely on datasheet specifications.
Conclusion:
Henkel positions itself as a comprehensive partner for EV component designers by delivering innovative thermal potting solutions that enhance heat management, component protection, and long-term reliability. Early collaboration with an experienced supplier like Henkel can help overcome the complexities of integrating potting into EV components, leading to improved performance, reduced warranty issues, and increased customer satisfaction.
