Thermally conductive battery adhesive targets e-vehicles

January 27, 2021 // By Christoph Hammerschmidt
Thermally conductive battery adhesive targets e-vehicles
Industrial adhesives manufacturer Delo has introduced a structural adhesive for batteries used in hybrid vehicles. Designed for high-volume series production, Delo-Duopox TC8686 is thermally conductive, flame-retardant and optimized for high-volume production. The product is currently used in the ramp-up of an automotive supplier.

Delo’s new adhesive is particularly suitable for low-voltage batteries as found in mild hybrids. This allows, for example, battery cells to be bonded into the battery housing while also efficiently dissipating the heat generated during operation.

Delo-Duopox TC8686 combines structural bonding and connection of the thermal management system in one step instead of mechanically connecting the battery cells and then using so-called gap fillers for heat dissipation. This saves one process step and simplifies production. The product is not only suitable for mild hybrids, but also for conventional hybrids and for other batteries in the low-voltage range, such as those used in e-bikes and e-scooters.

The product is designed for temperatures ranging from -40 °C to +85 °C and offers good strength on battery cells and typical housing materials. For example, the tensile shear strength on aluminum is 18 N/mm². The adhesive also meets the strength requirements of the automotive industry at typical operating temperatures between 10°C and 40°C up to the maximum service temperature of 80°C, a temperature at which the battery electrolyte can already be irreversibly damaged. The adhesive's properties in terms of elongation at tear also help to meet these requirements. A certain flexibility compensates for the different thermal expansion behaviors of cell and housing material during operation.

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