Drive train and electric mobility

Adhesives for drive trains and electric mobility

Combustion engines and electric drives are no different in one aspect: Wherever power is generated, so is heat, even in the most efficient of motors. Therefore, adhesives, sealants and encapsulants for motor-related applications must display high temperature resistance and be able to withstand the thermal influence. DELO offers an extensive portfolio of high-temperature-resistant products that also display exceptional chemical resistance and enable efficient production processes.

Adhesives for electric motors

Adhesives play an important part in making electric drives smaller and more powerful, while increasing their efficiency. For example, the installation space required for traditional production processes can be reduced thanks to narrow bonding gaps. Typical bonding applications for electric motors include the securing of buried or surface magnets, the stacking of segmented magnets and the bonding of stators and housings. Adhesives are also used for potting coils or for electrically insulating windings.

Suppliers benefit from DELO's extensive product portfolio. Specially developed for electric motors, the products offer maximum strength; they are temperature- and media-resistant, gap-filling, impact-resistant and tension-equalizing. Depending on the production process, curing is possible by heat, under the exclusion of air or, in the case of two-component products, at room temperature. If higher demands are placed on bonding accuracy, or if direct and fast further processing is required, such final curing is often preceded by initial light fixation. DELO therefore not only enables flexible, but also scalable and efficient production processes.
A host of bonding applications can be found in the electric motor.

DELO products properties / strengths

  • Pass automotive aging tests (e.g. 3,000 h / +180 °C)
  • Maximum structural strengths
  • Exceptional temperature and media resistance
  • Light fixation for fast processes

Battery adhesives for hybrid and electric cars

Adhesives, sealants, and encapsulants play an important role for all lithium-ion batteries. The concepts of 48V hybrid, plug-in hybrid and all-electric cars differ greatly, and accordingly, battery adhesives perform very different tasks.

Examples range from the bonding of capacitors and chokes on the printed circuit boards of battery control units to the screw-free and weld-free attachment of heat sinks and battery cells, the protection of certain components by encapsulation, right through to the battery pack itself. Using adhesives for the electrically conductive connection of semiconductor elements (e.g. in an inverter) also offers multiple advantages.

What DELO battery adhesives offer you

DELO adhesives not only perform structural tasks. In many cases, they also dissipate the heat generated during operation and are flame-retardant. Frequently, sealing requirements are added, even under the influence of temperature. In particular, of course, the adhesive must not influence the electrochemical function of the battery cell. In view of the increasing number of electric cars of all kinds, suppliers also benefit from DELO's expertise in fast production processes. In addition to classic heat or room temperature curing, light curing and light fixation in particular offer many options for efficiently producing higher volumes.

For further information take a look in our White paper:
Thermally conductive adhesives for low voltage battery cells


DELO products properties / strengths

  • High structural strengths
  • Reliable sealing
  • Excellent aging resistance
  • Good thermal conductivity
  • Flame protection: UL 94 V-0

Sensors for the engine compartment

Sensors in the motor compartment make the highest demands of adhesives and encapsulants. Rotor position sensors and (T)MAP sensors are good examples. MAP sensors measure intake air temperature and pressure. In order to protect them, highly reliable epoxy resins, 1C and 2C products are used for the sealing of pins and potting of printed circuit boards.

The potting must remain tight at pressure differences of up to 20 bar. Appropriate products must also be resistant to oil, gasoline, and brake fluid, and be suitable for use in a service temperature range from –40 °C to +160 °C. The potting on the sensor must not display any stress cracks and no interaction between media and potting compound must take place even after constant storage or several abrupt thermal cycles. An adjusted coefficient of thermal expansion (CTE) is required to equalize tensions between the FR4 PCB material and the plastic housings.

DELO products satisfy these requirements and also display good flowability. This ensures that the encapsulant can be quickly and evenly dispensed into the housing under vacuum, also filling narrower gaps underneath the printed circuit board, for example.

Adhesives and sealants for control units and plugs

Control units for motor or on-board electronics must be protected from humidity, media and corrosion, even under extreme temperatures. The most important task for adhesives and sealants is therefore the long-term protection of the control unit housing, plugs and other microswitches in the car. Another typical application is thermal management for power electronics. In air conditioning systems, for example, thermally conductive adhesives ensure that the heat generated under load is quickly dissipated to a heat sink.

Many DELO adhesives and sealants are developed specifically for these applications and for some of their special requirements, such as bonding to certain surface coatings. They provide the necessary reliability while enabling efficient production processes thanks to full curing or fixation within seconds and the enabling of in-line tightness testing.

DELO products properties / strengths

  • Very good sealing effect
  • Good thermal cycling and media resistance
  • Fast curing
  • In-line tightness testing

A digital knowledge package

Adhesive bonding is a demanding joining technology. To successfully solve bonding challenges, you need a good understanding of the basics and special features of this technology. Build up valuable knowledge with the help of our "TECH TALK" webinars!


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