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Bosch using DELO adhesives for its mild-hybrid battery packs

May 20, 2024

DELO announces that Bosch is developing a 48-volt battery system using DELO’s materials to keep the pack cool.

The 48-volt battery’s primary function is to store regenerated braking energy and supply it to the vehicle when accelerating. It also enables various electric driving functions, such as coasting, traffic jam assistance, and automated parking assistance. This energy can also be used for electrical features within the vehicle. The battery system is compact, measuring just 140 millimeters in height, allowing for flexible installation in discreet places such as the trunk or under the passenger seat.

Unlike conventional lithium-ion energy storage systems that heat up considerably due to their high power density, Bosch’s battery cells are reportedly more robust and can operate at temperatures of up to 75 °C. This increased heat resistance enables a simpler cooling function.

DELO has developed a special adhesive that is fire-resistant in accordance with the industry standard UL 94 V-0, designed for the battery’s entire temperature range and offers high strength on battery cells and typical housing materials. It has a tensile shear strength of 18 N/mm² on aluminum and has been optimized for manufacturing processes. The company says the adhesive’s most important property is a thermal conductivity of 1.0 W/(m·K), which allows battery cells to be bonded into the battery housing and for heat generated during operation to be efficiently dissipated. This adhesive simplifies production by combining structural bonding and thermal management system mounting in one step.

Bosch anticipates that by 2025, 20 percent of all cars and light commercial vehicles sold will be powered by mild-hybrid powertrains. The company’s 48-volt batteries are already being used in many vehicles around the world.