Thermally Conductive Battery Adhesive for Hybrid Vehicles: DELO-DUOPOX TC8686

DELO, one of the world’s leading manufacturers of industrial adhesives for automotive, consumer, and industrial electronics applications, now offers a structural adhesive for batteries used in hybrid vehicles. Designed for high-volume series production, DELO-DUOPOX TC8686 is thermally conductive and flame-retardant.

Thermally conductive adhesive (magenta-colored for illustration) for low-voltage battery systems such as those used in mild hybrid vehicles (figure: DELO)

Already being used by an automotive supplier in the ramp-up phase of production, this new adhesive is suitable for low-voltage batteries found in mild hybrid and conventional hybrid vehicles, as well as in e-bikes and e-scooters. The adhesive allows battery cells to be bonded into a battery’s housing while dissipating the heat generated during operation.

Lithium-ion batteries pack in electrical automotive

Instead of mechanically connecting the battery cells and then using gap fillers for heat dissipation, DELO-DUOPOX TC8686 combines the connection of the thermal management system and structural bonding into one step, simplifying production.

Adhesive properties optimized for batteries

• DELO-DUOPOX TC8686 is designed for temperatures ranging from -40 °C to +85 °C and offers good strength on battery cells and typical housing materials.
• The tensile shear strength of the adhesive on aluminum is 18 N/mm² and meets the strength requirements of the automotive industry at typical operating temperatures ranging from 10°C to 40 °C as well as at maximum service temperatures of 80°C. Temperatures beyond this can result in irreversible damage to the battery electrolyte.
• The adhesive's elongation at tear also helps to meet these requirements. Certain flexibility compensates for the different thermal expansion behaviors of cell and housing material during operation.
• The adhesive has a thermal conductivity of 1.1 W/m*K. It also meets the requirements for flame retardancy according to UL 94 V-0.

Developed with a view to high-volume series production

• DELO-DUOPOX TC8686 has been optimized for manufacturing processes. It offers a simple mixing ratio of 2:1 and has a processing time of approximately 30 minutes after mixing. This is long enough for prototypes and small series and fast enough for fully automated systems.
• After four hours, the adhesive reaches its initial strength. Ninety percent of its final strength can be achieved after 24 hours.
• Even with low heat input, this amount of time can be reduced significantly.
• Depending on the battery electrolyte used, a curing temperature of 60°C can help to speed up assembly.
• Beige in color, the product is easily detectable by cameras, ensuring accurate application control.
• In addition, the filler for thermal conductivity is only slightly abrasive, contributing to the dispensing systems' long lifespan.
• The product is classified in transport category 1. It is easy to transport and can be stored at room temperature.

 Source: http://www.delo-adhesives.com

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Reference: 

DELO ADHESIVE APPLIED IN E-MOTOR

DELO ADHESIVE INTEGRATION DISPERSION TECHNOLOGY

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