The challenge
Renault is a leading automaker of electric mobility vehicles (EVs). As a pioneer in large-scale electric mobility development, Renault is familiar with the challenges associated with EV battery technology. EV batteries perform best, both operationally and safely, when controlling temperature through materials that enhance heat dissipation and prevent thermal runaway, both during charging and operation. These materials must have the required properties whilst being easy to apply in high-volume manufacturing environments and allowing for the repair or replacement of battery cells throughout the battery’s lifespan.
The project
Electric mobility vehicles require effective thermal management for the safety and longevity of high-energy-density battery modules. Renault, a leading pioneer in automotive electrification, recognises the significance of battery technology to bolster its growing range of hybrid and electric vehicles. Leveraging a long-standing relationship, Renault collaborated with DuPont, a market leader in adhesive and sealing technology, applying material science expertise to solve battery pack thermal management challenges. Developed through DuPont’s application expertise and material capabilities, BETATECH™ thermal interface material is a ground-breaking solution for battery pack assembly between the battery cells and the cooling plate.
The solution
DuPont, leveraging its in-house application development, technical, and manufacturing expertise, worked closely with Renault and dispensing equipment suppliers to develop a viable thermal interface material solution for production in a high-volume assembly environment.
BETATECH™ thermal interface materials are available as 1K or 2K dispensable thermal-conductive polyurethane products applied between the battery module and heatsink. Its ease of use contributes to production efficiencies, enabling a repeatable process. It also demonstrates other benefits, including:
- Non-abrasive formulation – no equipment wear
- Fast dispensing – compression or injection process compatible
- Fast joining – low press-in force
- Retention of thermal conductivity – due to good contact between battery cells and cooling plate with no gaps
- No sagging – in vertical ageing test
- Long working time – >30 minutes
- No physical change – over ageing
- Repairability – low pull-out force
The result
BETATECH™ thermal interface material is a new solution that helps control heat by maintaining thermal conductivity over a wide range of operating temperatures. With the benefits of easy dispensing and fast joining, the one-component formulation of BETATECH™ thermal interface material now supplies Renault Group’s production facilities in Maubeuge and Douai, France.
