Ceramicized Silicone Foam for Cell-to-Cell Thermal Runaway Protection in EV Battery Packs

As lithium-ion batteries continue to evolve toward higher energy density, improving battery safety has become a critical engineering priority. During a thermal runaway event, excessive heat generated by a single cell can rapidly propagate to adjacent cells, increasing the risk of module failure and fire. Consequently, battery manufacturers are adopting advanced thermal barrier materials to delay or prevent thermal propagation.

Ceramicized Silicone Foam has emerged as an effective solution for cell-to-cell thermal insulation because it combines thermal resistance, electrical insulation, flame retardancy, and mechanical cushioning. Unlike conventional silicone foams, it forms a rigid ceramic layer when exposed to extreme temperatures, helping maintain structural integrity and reducing heat transfer between neighboring cells.

Why Ceramicized Silicone Foam Matters

Traditional insulating materials such as mica sheets, ceramic fiber papers, and standard silicone foams often require trade-offs between flexibility, thermal protection, and durability. Ceramicized Silicone Foam addresses these challenges by providing both elastic compression and high-temperature protection within a single material.

When exposed to fire or thermal runaway conditions, Ceramicized Silicone Foam undergoes a ceramicization process that creates a dense protective barrier. This ceramic layer slows flame penetration, reduces radiant heat transfer, and helps prevent thermal runaway propagation, providing valuable response time for battery protection systems.

Engineering Benefits for Cell-to-Cell Applications

• Excellent thermal barrier performance for delaying heat propagation.
• Electrical insulation suitable for high-voltage battery systems.
• Elastic cushioning that absorbs vibration and compensates for manufacturing tolerances.
• Low compression set for long-term dimensional stability.
• Lightweight construction supporting higher battery energy density.
• Reliable performance under demanding automotive operating conditions.

Key Performance Parameters

TOUSEN Ceramicized Silicone Foam Solution

TOUSEN has developed Ceramicized Silicone Foam specifically for EV battery packs, energy storage systems (ESS), and other high-reliability applications. The material combines flexible cushioning with ceramicized thermal protection, offering an effective solution for cell-to-cell thermal barriers.

Key features include:

• Ceramicization technology for enhanced fire protection
• Excellent thermal runaway resistance
• High-performance electrical insulation
• Superior compression recovery and durability
• Custom thicknesses and densities for various battery designs

Learn more about the TOUSEN solution:

//www.itousen.com/ceramicized-silicone-foam.html

Conclusion

As battery systems become more compact and energy dense, selecting the appropriate thermal barrier material is increasingly important. Ceramicized Silicone Foam provides an effective combination of thermal insulation, flame resistance, electrical insulation, and mechanical resilience, making it an ideal material for modern cell-to-cell battery protection. By incorporating advanced ceramicization technology, manufacturers can significantly improve battery safety, reduce thermal propagation risk, and support compliance with increasingly stringent global safety standards.